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6f086dfc | 1 | /* Expands front end tree to back end RTL for GNU C-Compiler |
af841dbd JL |
2 | Copyright (C) 1987, 1988, 1989, 1991, 1992, 1993, 1994, 1995, 1996, 1997, |
3 | 1998, 1999, 2000 Free Software Foundation, Inc. | |
6f086dfc RS |
4 | |
5 | This file is part of GNU CC. | |
6 | ||
7 | GNU CC is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 2, or (at your option) | |
10 | any later version. | |
11 | ||
12 | GNU CC is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with GNU CC; see the file COPYING. If not, write to | |
a35311b0 RK |
19 | the Free Software Foundation, 59 Temple Place - Suite 330, |
20 | Boston, MA 02111-1307, USA. */ | |
6f086dfc | 21 | |
6f086dfc RS |
22 | /* This file handles the generation of rtl code from tree structure |
23 | at the level of the function as a whole. | |
24 | It creates the rtl expressions for parameters and auto variables | |
25 | and has full responsibility for allocating stack slots. | |
26 | ||
27 | `expand_function_start' is called at the beginning of a function, | |
28 | before the function body is parsed, and `expand_function_end' is | |
29 | called after parsing the body. | |
30 | ||
31 | Call `assign_stack_local' to allocate a stack slot for a local variable. | |
32 | This is usually done during the RTL generation for the function body, | |
33 | but it can also be done in the reload pass when a pseudo-register does | |
34 | not get a hard register. | |
35 | ||
36 | Call `put_var_into_stack' when you learn, belatedly, that a variable | |
37 | previously given a pseudo-register must in fact go in the stack. | |
38 | This function changes the DECL_RTL to be a stack slot instead of a reg | |
39 | then scans all the RTL instructions so far generated to correct them. */ | |
40 | ||
41 | #include "config.h" | |
670ee920 | 42 | #include "system.h" |
6f086dfc RS |
43 | #include "rtl.h" |
44 | #include "tree.h" | |
45 | #include "flags.h" | |
1ef08c63 | 46 | #include "except.h" |
6f086dfc RS |
47 | #include "function.h" |
48 | #include "insn-flags.h" | |
49 | #include "expr.h" | |
50 | #include "insn-codes.h" | |
51 | #include "regs.h" | |
52 | #include "hard-reg-set.h" | |
53 | #include "insn-config.h" | |
54 | #include "recog.h" | |
55 | #include "output.h" | |
bdac5f58 | 56 | #include "basic-block.h" |
c20bf1f3 | 57 | #include "obstack.h" |
10f0ad3d | 58 | #include "toplev.h" |
fe9b4957 | 59 | #include "hash.h" |
87ff9c8e | 60 | #include "ggc.h" |
b1474bb7 | 61 | #include "tm_p.h" |
6f086dfc | 62 | |
f73ad30e JH |
63 | #ifndef ACCUMULATE_OUTGOING_ARGS |
64 | #define ACCUMULATE_OUTGOING_ARGS 0 | |
65 | #endif | |
66 | ||
189cc377 RK |
67 | #ifndef TRAMPOLINE_ALIGNMENT |
68 | #define TRAMPOLINE_ALIGNMENT FUNCTION_BOUNDARY | |
69 | #endif | |
70 | ||
d16790f2 JW |
71 | #ifndef LOCAL_ALIGNMENT |
72 | #define LOCAL_ALIGNMENT(TYPE, ALIGNMENT) ALIGNMENT | |
73 | #endif | |
74 | ||
a0871656 JH |
75 | #if !defined (PREFERRED_STACK_BOUNDARY) && defined (STACK_BOUNDARY) |
76 | #define PREFERRED_STACK_BOUNDARY STACK_BOUNDARY | |
77 | #endif | |
78 | ||
293e3de4 RS |
79 | /* Some systems use __main in a way incompatible with its use in gcc, in these |
80 | cases use the macros NAME__MAIN to give a quoted symbol and SYMBOL__MAIN to | |
81 | give the same symbol without quotes for an alternative entry point. You | |
0f41302f | 82 | must define both, or neither. */ |
293e3de4 RS |
83 | #ifndef NAME__MAIN |
84 | #define NAME__MAIN "__main" | |
85 | #define SYMBOL__MAIN __main | |
86 | #endif | |
87 | ||
6f086dfc RS |
88 | /* Round a value to the lowest integer less than it that is a multiple of |
89 | the required alignment. Avoid using division in case the value is | |
90 | negative. Assume the alignment is a power of two. */ | |
91 | #define FLOOR_ROUND(VALUE,ALIGN) ((VALUE) & ~((ALIGN) - 1)) | |
92 | ||
93 | /* Similar, but round to the next highest integer that meets the | |
94 | alignment. */ | |
95 | #define CEIL_ROUND(VALUE,ALIGN) (((VALUE) + (ALIGN) - 1) & ~((ALIGN)- 1)) | |
96 | ||
97 | /* NEED_SEPARATE_AP means that we cannot derive ap from the value of fp | |
98 | during rtl generation. If they are different register numbers, this is | |
99 | always true. It may also be true if | |
100 | FIRST_PARM_OFFSET - STARTING_FRAME_OFFSET is not a constant during rtl | |
101 | generation. See fix_lexical_addr for details. */ | |
102 | ||
103 | #if ARG_POINTER_REGNUM != FRAME_POINTER_REGNUM | |
104 | #define NEED_SEPARATE_AP | |
105 | #endif | |
106 | ||
54ff41b7 JW |
107 | /* Nonzero if function being compiled doesn't contain any calls |
108 | (ignoring the prologue and epilogue). This is set prior to | |
109 | local register allocation and is valid for the remaining | |
718fe406 | 110 | compiler passes. */ |
54ff41b7 JW |
111 | int current_function_is_leaf; |
112 | ||
fb13d4d0 JM |
113 | /* Nonzero if function being compiled doesn't contain any instructions |
114 | that can throw an exception. This is set prior to final. */ | |
115 | ||
116 | int current_function_nothrow; | |
117 | ||
fdb8a883 JW |
118 | /* Nonzero if function being compiled doesn't modify the stack pointer |
119 | (ignoring the prologue and epilogue). This is only valid after | |
718fe406 | 120 | life_analysis has run. */ |
fdb8a883 JW |
121 | int current_function_sp_is_unchanging; |
122 | ||
54ff41b7 JW |
123 | /* Nonzero if the function being compiled is a leaf function which only |
124 | uses leaf registers. This is valid after reload (specifically after | |
125 | sched2) and is useful only if the port defines LEAF_REGISTERS. */ | |
54ff41b7 JW |
126 | int current_function_uses_only_leaf_regs; |
127 | ||
6f086dfc RS |
128 | /* Nonzero once virtual register instantiation has been done. |
129 | assign_stack_local uses frame_pointer_rtx when this is nonzero. */ | |
130 | static int virtuals_instantiated; | |
131 | ||
46766466 RS |
132 | /* These variables hold pointers to functions to |
133 | save and restore machine-specific data, | |
134 | in push_function_context and pop_function_context. */ | |
711d877c KG |
135 | void (*init_machine_status) PARAMS ((struct function *)); |
136 | void (*save_machine_status) PARAMS ((struct function *)); | |
137 | void (*restore_machine_status) PARAMS ((struct function *)); | |
138 | void (*mark_machine_status) PARAMS ((struct function *)); | |
139 | void (*free_machine_status) PARAMS ((struct function *)); | |
46766466 | 140 | |
8c5666b4 | 141 | /* Likewise, but for language-specific data. */ |
711d877c KG |
142 | void (*init_lang_status) PARAMS ((struct function *)); |
143 | void (*save_lang_status) PARAMS ((struct function *)); | |
144 | void (*restore_lang_status) PARAMS ((struct function *)); | |
145 | void (*mark_lang_status) PARAMS ((struct function *)); | |
146 | void (*free_lang_status) PARAMS ((struct function *)); | |
8c5666b4 | 147 | |
49ad7cfa BS |
148 | /* The FUNCTION_DECL for an inline function currently being expanded. */ |
149 | tree inline_function_decl; | |
b384405b BS |
150 | |
151 | /* The currently compiled function. */ | |
01d939e8 | 152 | struct function *cfun = 0; |
b384405b BS |
153 | |
154 | /* Global list of all compiled functions. */ | |
155 | struct function *all_functions = 0; | |
5c7675e9 RH |
156 | |
157 | /* These arrays record the INSN_UIDs of the prologue and epilogue insns. */ | |
0a1c58a2 JL |
158 | static varray_type prologue; |
159 | static varray_type epilogue; | |
160 | ||
161 | /* Array of INSN_UIDs to hold the INSN_UIDs for each sibcall epilogue | |
162 | in this function. */ | |
163 | static varray_type sibcall_epilogue; | |
6f086dfc RS |
164 | \f |
165 | /* In order to evaluate some expressions, such as function calls returning | |
166 | structures in memory, we need to temporarily allocate stack locations. | |
167 | We record each allocated temporary in the following structure. | |
168 | ||
169 | Associated with each temporary slot is a nesting level. When we pop up | |
170 | one level, all temporaries associated with the previous level are freed. | |
171 | Normally, all temporaries are freed after the execution of the statement | |
172 | in which they were created. However, if we are inside a ({...}) grouping, | |
173 | the result may be in a temporary and hence must be preserved. If the | |
174 | result could be in a temporary, we preserve it if we can determine which | |
175 | one it is in. If we cannot determine which temporary may contain the | |
176 | result, all temporaries are preserved. A temporary is preserved by | |
177 | pretending it was allocated at the previous nesting level. | |
178 | ||
179 | Automatic variables are also assigned temporary slots, at the nesting | |
180 | level where they are defined. They are marked a "kept" so that | |
181 | free_temp_slots will not free them. */ | |
182 | ||
183 | struct temp_slot | |
184 | { | |
185 | /* Points to next temporary slot. */ | |
186 | struct temp_slot *next; | |
0f41302f | 187 | /* The rtx to used to reference the slot. */ |
6f086dfc | 188 | rtx slot; |
e5e76139 RK |
189 | /* The rtx used to represent the address if not the address of the |
190 | slot above. May be an EXPR_LIST if multiple addresses exist. */ | |
191 | rtx address; | |
718fe406 | 192 | /* The alignment (in bits) of the slot. */ |
d16790f2 | 193 | int align; |
6f086dfc | 194 | /* The size, in units, of the slot. */ |
e5e809f4 | 195 | HOST_WIDE_INT size; |
a4c6502a MM |
196 | /* The alias set for the slot. If the alias set is zero, we don't |
197 | know anything about the alias set of the slot. We must only | |
198 | reuse a slot if it is assigned an object of the same alias set. | |
199 | Otherwise, the rest of the compiler may assume that the new use | |
200 | of the slot cannot alias the old use of the slot, which is | |
201 | false. If the slot has alias set zero, then we can't reuse the | |
202 | slot at all, since we have no idea what alias set may have been | |
203 | imposed on the memory. For example, if the stack slot is the | |
204 | call frame for an inline functioned, we have no idea what alias | |
205 | sets will be assigned to various pieces of the call frame. */ | |
3bdf5ad1 | 206 | HOST_WIDE_INT alias_set; |
e7a84011 RK |
207 | /* The value of `sequence_rtl_expr' when this temporary is allocated. */ |
208 | tree rtl_expr; | |
6f086dfc RS |
209 | /* Non-zero if this temporary is currently in use. */ |
210 | char in_use; | |
a25d4ba2 RK |
211 | /* Non-zero if this temporary has its address taken. */ |
212 | char addr_taken; | |
6f086dfc RS |
213 | /* Nesting level at which this slot is being used. */ |
214 | int level; | |
215 | /* Non-zero if this should survive a call to free_temp_slots. */ | |
216 | int keep; | |
fc91b0d0 RK |
217 | /* The offset of the slot from the frame_pointer, including extra space |
218 | for alignment. This info is for combine_temp_slots. */ | |
e5e809f4 | 219 | HOST_WIDE_INT base_offset; |
fc91b0d0 RK |
220 | /* The size of the slot, including extra space for alignment. This |
221 | info is for combine_temp_slots. */ | |
e5e809f4 | 222 | HOST_WIDE_INT full_size; |
6f086dfc | 223 | }; |
6f086dfc | 224 | \f |
e15679f8 RK |
225 | /* This structure is used to record MEMs or pseudos used to replace VAR, any |
226 | SUBREGs of VAR, and any MEMs containing VAR as an address. We need to | |
227 | maintain this list in case two operands of an insn were required to match; | |
228 | in that case we must ensure we use the same replacement. */ | |
229 | ||
230 | struct fixup_replacement | |
231 | { | |
232 | rtx old; | |
233 | rtx new; | |
234 | struct fixup_replacement *next; | |
235 | }; | |
718fe406 | 236 | |
fe9b4957 MM |
237 | struct insns_for_mem_entry { |
238 | /* The KEY in HE will be a MEM. */ | |
239 | struct hash_entry he; | |
240 | /* These are the INSNS which reference the MEM. */ | |
241 | rtx insns; | |
242 | }; | |
243 | ||
e15679f8 RK |
244 | /* Forward declarations. */ |
245 | ||
711d877c KG |
246 | static rtx assign_stack_local_1 PARAMS ((enum machine_mode, HOST_WIDE_INT, |
247 | int, struct function *)); | |
248 | static rtx assign_stack_temp_for_type PARAMS ((enum machine_mode, | |
249 | HOST_WIDE_INT, int, tree)); | |
250 | static struct temp_slot *find_temp_slot_from_address PARAMS ((rtx)); | |
251 | static void put_reg_into_stack PARAMS ((struct function *, rtx, tree, | |
252 | enum machine_mode, enum machine_mode, | |
770ae6cc RK |
253 | int, unsigned int, int, |
254 | struct hash_table *)); | |
018577e4 R |
255 | static void schedule_fixup_var_refs PARAMS ((struct function *, rtx, tree, |
256 | enum machine_mode, | |
257 | struct hash_table *)); | |
718fe406 | 258 | static void fixup_var_refs PARAMS ((rtx, enum machine_mode, int, |
711d877c | 259 | struct hash_table *)); |
e15679f8 | 260 | static struct fixup_replacement |
711d877c KG |
261 | *find_fixup_replacement PARAMS ((struct fixup_replacement **, rtx)); |
262 | static void fixup_var_refs_insns PARAMS ((rtx, enum machine_mode, int, | |
263 | rtx, int, struct hash_table *)); | |
264 | static void fixup_var_refs_1 PARAMS ((rtx, enum machine_mode, rtx *, rtx, | |
265 | struct fixup_replacement **)); | |
266 | static rtx fixup_memory_subreg PARAMS ((rtx, rtx, int)); | |
267 | static rtx walk_fixup_memory_subreg PARAMS ((rtx, rtx, int)); | |
268 | static rtx fixup_stack_1 PARAMS ((rtx, rtx)); | |
269 | static void optimize_bit_field PARAMS ((rtx, rtx, rtx *)); | |
270 | static void instantiate_decls PARAMS ((tree, int)); | |
271 | static void instantiate_decls_1 PARAMS ((tree, int)); | |
770ae6cc | 272 | static void instantiate_decl PARAMS ((rtx, HOST_WIDE_INT, int)); |
711d877c KG |
273 | static int instantiate_virtual_regs_1 PARAMS ((rtx *, rtx, int)); |
274 | static void delete_handlers PARAMS ((void)); | |
275 | static void pad_to_arg_alignment PARAMS ((struct args_size *, int, | |
276 | struct args_size *)); | |
51723711 | 277 | #ifndef ARGS_GROW_DOWNWARD |
711d877c KG |
278 | static void pad_below PARAMS ((struct args_size *, enum machine_mode, |
279 | tree)); | |
51723711 | 280 | #endif |
711d877c | 281 | static rtx round_trampoline_addr PARAMS ((rtx)); |
0a1c58a2 JL |
282 | static tree *identify_blocks_1 PARAMS ((rtx, tree *, tree *, tree *)); |
283 | static void reorder_blocks_1 PARAMS ((rtx, tree, varray_type *)); | |
711d877c KG |
284 | static tree blocks_nreverse PARAMS ((tree)); |
285 | static int all_blocks PARAMS ((tree, tree *)); | |
18c038b9 | 286 | static tree *get_block_vector PARAMS ((tree, int *)); |
ec97b83a KG |
287 | /* We always define `record_insns' even if its not used so that we |
288 | can always export `prologue_epilogue_contains'. */ | |
0a1c58a2 JL |
289 | static void record_insns PARAMS ((rtx, varray_type *)) ATTRIBUTE_UNUSED; |
290 | static int contains PARAMS ((rtx, varray_type)); | |
73ef99fb | 291 | #ifdef HAVE_return |
86c82654 | 292 | static void emit_return_into_block PARAMS ((basic_block, rtx)); |
73ef99fb | 293 | #endif |
711d877c | 294 | static void put_addressof_into_stack PARAMS ((rtx, struct hash_table *)); |
718fe406 | 295 | static boolean purge_addressof_1 PARAMS ((rtx *, rtx, int, int, |
711d877c | 296 | struct hash_table *)); |
659e47fb | 297 | static void purge_single_hard_subreg_set PARAMS ((rtx)); |
7393c642 RK |
298 | #ifdef HAVE_epilogue |
299 | static void keep_stack_depressed PARAMS ((rtx)); | |
300 | #endif | |
711d877c KG |
301 | static int is_addressof PARAMS ((rtx *, void *)); |
302 | static struct hash_entry *insns_for_mem_newfunc PARAMS ((struct hash_entry *, | |
303 | struct hash_table *, | |
304 | hash_table_key)); | |
305 | static unsigned long insns_for_mem_hash PARAMS ((hash_table_key)); | |
306 | static boolean insns_for_mem_comp PARAMS ((hash_table_key, hash_table_key)); | |
307 | static int insns_for_mem_walk PARAMS ((rtx *, void *)); | |
308 | static void compute_insns_for_mem PARAMS ((rtx, rtx, struct hash_table *)); | |
309 | static void mark_temp_slot PARAMS ((struct temp_slot *)); | |
310 | static void mark_function_status PARAMS ((struct function *)); | |
311 | static void mark_function_chain PARAMS ((void *)); | |
312 | static void prepare_function_start PARAMS ((void)); | |
c13fde05 RH |
313 | static void do_clobber_return_reg PARAMS ((rtx, void *)); |
314 | static void do_use_return_reg PARAMS ((rtx, void *)); | |
c20bf1f3 | 315 | \f |
6f086dfc RS |
316 | /* Pointer to chain of `struct function' for containing functions. */ |
317 | struct function *outer_function_chain; | |
318 | ||
319 | /* Given a function decl for a containing function, | |
320 | return the `struct function' for it. */ | |
321 | ||
322 | struct function * | |
323 | find_function_data (decl) | |
324 | tree decl; | |
325 | { | |
326 | struct function *p; | |
e5e809f4 | 327 | |
6f086dfc RS |
328 | for (p = outer_function_chain; p; p = p->next) |
329 | if (p->decl == decl) | |
330 | return p; | |
e5e809f4 | 331 | |
6f086dfc RS |
332 | abort (); |
333 | } | |
334 | ||
335 | /* Save the current context for compilation of a nested function. | |
8c5666b4 BS |
336 | This is called from language-specific code. The caller should use |
337 | the save_lang_status callback to save any language-specific state, | |
338 | since this function knows only about language-independent | |
339 | variables. */ | |
6f086dfc RS |
340 | |
341 | void | |
a0dabda5 JM |
342 | push_function_context_to (context) |
343 | tree context; | |
6f086dfc | 344 | { |
36edd3cc BS |
345 | struct function *p, *context_data; |
346 | ||
347 | if (context) | |
348 | { | |
349 | context_data = (context == current_function_decl | |
01d939e8 | 350 | ? cfun |
36edd3cc BS |
351 | : find_function_data (context)); |
352 | context_data->contains_functions = 1; | |
353 | } | |
b384405b | 354 | |
01d939e8 | 355 | if (cfun == 0) |
b384405b | 356 | init_dummy_function_start (); |
01d939e8 | 357 | p = cfun; |
6f086dfc RS |
358 | |
359 | p->next = outer_function_chain; | |
360 | outer_function_chain = p; | |
6f086dfc RS |
361 | p->fixup_var_refs_queue = 0; |
362 | ||
8c5666b4 BS |
363 | if (save_lang_status) |
364 | (*save_lang_status) (p); | |
46766466 RS |
365 | if (save_machine_status) |
366 | (*save_machine_status) (p); | |
b384405b | 367 | |
01d939e8 | 368 | cfun = 0; |
6f086dfc RS |
369 | } |
370 | ||
e4a4639e JM |
371 | void |
372 | push_function_context () | |
373 | { | |
a0dabda5 | 374 | push_function_context_to (current_function_decl); |
e4a4639e JM |
375 | } |
376 | ||
6f086dfc RS |
377 | /* Restore the last saved context, at the end of a nested function. |
378 | This function is called from language-specific code. */ | |
379 | ||
380 | void | |
a0dabda5 | 381 | pop_function_context_from (context) |
ca3075bd | 382 | tree context ATTRIBUTE_UNUSED; |
6f086dfc RS |
383 | { |
384 | struct function *p = outer_function_chain; | |
e5e809f4 | 385 | struct var_refs_queue *queue; |
a3770a81 | 386 | struct var_refs_queue *next; |
6f086dfc | 387 | |
01d939e8 | 388 | cfun = p; |
6f086dfc RS |
389 | outer_function_chain = p->next; |
390 | ||
6f086dfc | 391 | current_function_decl = p->decl; |
7cbc7b0c | 392 | reg_renumber = 0; |
6f086dfc | 393 | |
6f086dfc | 394 | restore_emit_status (p); |
6f086dfc | 395 | |
46766466 RS |
396 | if (restore_machine_status) |
397 | (*restore_machine_status) (p); | |
8c5666b4 BS |
398 | if (restore_lang_status) |
399 | (*restore_lang_status) (p); | |
46766466 | 400 | |
6f086dfc RS |
401 | /* Finish doing put_var_into_stack for any of our variables |
402 | which became addressable during the nested function. */ | |
a3770a81 RH |
403 | for (queue = p->fixup_var_refs_queue; queue; queue = next) |
404 | { | |
405 | next = queue->next; | |
406 | fixup_var_refs (queue->modified, queue->promoted_mode, | |
407 | queue->unsignedp, 0); | |
408 | free (queue); | |
409 | } | |
410 | p->fixup_var_refs_queue = 0; | |
6f086dfc | 411 | |
6f086dfc RS |
412 | /* Reset variables that have known state during rtx generation. */ |
413 | rtx_equal_function_value_matters = 1; | |
414 | virtuals_instantiated = 0; | |
1b3d8f8a | 415 | generating_concat_p = 1; |
6f086dfc | 416 | } |
e4a4639e | 417 | |
36edd3cc BS |
418 | void |
419 | pop_function_context () | |
e4a4639e | 420 | { |
a0dabda5 | 421 | pop_function_context_from (current_function_decl); |
e4a4639e | 422 | } |
e2ecd91c | 423 | |
fa51b01b RH |
424 | /* Clear out all parts of the state in F that can safely be discarded |
425 | after the function has been parsed, but not compiled, to let | |
426 | garbage collection reclaim the memory. */ | |
427 | ||
428 | void | |
429 | free_after_parsing (f) | |
430 | struct function *f; | |
431 | { | |
432 | /* f->expr->forced_labels is used by code generation. */ | |
433 | /* f->emit->regno_reg_rtx is used by code generation. */ | |
434 | /* f->varasm is used by code generation. */ | |
435 | /* f->eh->eh_return_stub_label is used by code generation. */ | |
436 | ||
437 | if (free_lang_status) | |
438 | (*free_lang_status) (f); | |
439 | free_stmt_status (f); | |
440 | } | |
441 | ||
e2ecd91c BS |
442 | /* Clear out all parts of the state in F that can safely be discarded |
443 | after the function has been compiled, to let garbage collection | |
0a8a198c | 444 | reclaim the memory. */ |
21cd906e | 445 | |
e2ecd91c | 446 | void |
0a8a198c | 447 | free_after_compilation (f) |
e2ecd91c BS |
448 | struct function *f; |
449 | { | |
bedda2da MM |
450 | struct temp_slot *ts; |
451 | struct temp_slot *next; | |
452 | ||
fa51b01b RH |
453 | free_eh_status (f); |
454 | free_expr_status (f); | |
0a8a198c MM |
455 | free_emit_status (f); |
456 | free_varasm_status (f); | |
e2ecd91c | 457 | |
fa51b01b RH |
458 | if (free_machine_status) |
459 | (*free_machine_status) (f); | |
460 | ||
5faf03ae MM |
461 | if (f->x_parm_reg_stack_loc) |
462 | free (f->x_parm_reg_stack_loc); | |
fa51b01b | 463 | |
bedda2da MM |
464 | for (ts = f->x_temp_slots; ts; ts = next) |
465 | { | |
466 | next = ts->next; | |
467 | free (ts); | |
468 | } | |
469 | f->x_temp_slots = NULL; | |
470 | ||
fa51b01b RH |
471 | f->arg_offset_rtx = NULL; |
472 | f->return_rtx = NULL; | |
473 | f->internal_arg_pointer = NULL; | |
474 | f->x_nonlocal_labels = NULL; | |
475 | f->x_nonlocal_goto_handler_slots = NULL; | |
476 | f->x_nonlocal_goto_handler_labels = NULL; | |
477 | f->x_nonlocal_goto_stack_level = NULL; | |
478 | f->x_cleanup_label = NULL; | |
479 | f->x_return_label = NULL; | |
480 | f->x_save_expr_regs = NULL; | |
481 | f->x_stack_slot_list = NULL; | |
482 | f->x_rtl_expr_chain = NULL; | |
483 | f->x_tail_recursion_label = NULL; | |
484 | f->x_tail_recursion_reentry = NULL; | |
485 | f->x_arg_pointer_save_area = NULL; | |
486 | f->x_context_display = NULL; | |
487 | f->x_trampoline_list = NULL; | |
488 | f->x_parm_birth_insn = NULL; | |
489 | f->x_last_parm_insn = NULL; | |
490 | f->x_parm_reg_stack_loc = NULL; | |
fa51b01b RH |
491 | f->fixup_var_refs_queue = NULL; |
492 | f->original_arg_vector = NULL; | |
493 | f->original_decl_initial = NULL; | |
494 | f->inl_last_parm_insn = NULL; | |
495 | f->epilogue_delay_list = NULL; | |
e2ecd91c | 496 | } |
6f086dfc RS |
497 | \f |
498 | /* Allocate fixed slots in the stack frame of the current function. */ | |
499 | ||
49ad7cfa BS |
500 | /* Return size needed for stack frame based on slots so far allocated in |
501 | function F. | |
c795bca9 | 502 | This size counts from zero. It is not rounded to PREFERRED_STACK_BOUNDARY; |
6f086dfc RS |
503 | the caller may have to do that. */ |
504 | ||
8af5168b | 505 | HOST_WIDE_INT |
49ad7cfa BS |
506 | get_func_frame_size (f) |
507 | struct function *f; | |
6f086dfc RS |
508 | { |
509 | #ifdef FRAME_GROWS_DOWNWARD | |
49ad7cfa | 510 | return -f->x_frame_offset; |
6f086dfc | 511 | #else |
49ad7cfa | 512 | return f->x_frame_offset; |
6f086dfc RS |
513 | #endif |
514 | } | |
515 | ||
49ad7cfa BS |
516 | /* Return size needed for stack frame based on slots so far allocated. |
517 | This size counts from zero. It is not rounded to PREFERRED_STACK_BOUNDARY; | |
518 | the caller may have to do that. */ | |
519 | HOST_WIDE_INT | |
520 | get_frame_size () | |
521 | { | |
01d939e8 | 522 | return get_func_frame_size (cfun); |
49ad7cfa BS |
523 | } |
524 | ||
6f086dfc RS |
525 | /* Allocate a stack slot of SIZE bytes and return a MEM rtx for it |
526 | with machine mode MODE. | |
718fe406 | 527 | |
6f086dfc RS |
528 | ALIGN controls the amount of alignment for the address of the slot: |
529 | 0 means according to MODE, | |
530 | -1 means use BIGGEST_ALIGNMENT and round size to multiple of that, | |
531 | positive specifies alignment boundary in bits. | |
532 | ||
e2ecd91c | 533 | We do not round to stack_boundary here. |
6f086dfc | 534 | |
e2ecd91c BS |
535 | FUNCTION specifies the function to allocate in. */ |
536 | ||
537 | static rtx | |
538 | assign_stack_local_1 (mode, size, align, function) | |
6f086dfc | 539 | enum machine_mode mode; |
e5e809f4 | 540 | HOST_WIDE_INT size; |
6f086dfc | 541 | int align; |
e2ecd91c | 542 | struct function *function; |
6f086dfc RS |
543 | { |
544 | register rtx x, addr; | |
545 | int bigend_correction = 0; | |
546 | int alignment; | |
547 | ||
548 | if (align == 0) | |
549 | { | |
d16790f2 JW |
550 | tree type; |
551 | ||
6f086dfc | 552 | if (mode == BLKmode) |
d16790f2 | 553 | alignment = BIGGEST_ALIGNMENT; |
dbab7b72 | 554 | else |
718fe406 | 555 | alignment = GET_MODE_ALIGNMENT (mode); |
d16790f2 JW |
556 | |
557 | /* Allow the target to (possibly) increase the alignment of this | |
558 | stack slot. */ | |
559 | type = type_for_mode (mode, 0); | |
560 | if (type) | |
561 | alignment = LOCAL_ALIGNMENT (type, alignment); | |
562 | ||
563 | alignment /= BITS_PER_UNIT; | |
6f086dfc RS |
564 | } |
565 | else if (align == -1) | |
566 | { | |
567 | alignment = BIGGEST_ALIGNMENT / BITS_PER_UNIT; | |
568 | size = CEIL_ROUND (size, alignment); | |
569 | } | |
570 | else | |
571 | alignment = align / BITS_PER_UNIT; | |
572 | ||
1474e303 | 573 | #ifdef FRAME_GROWS_DOWNWARD |
e2ecd91c | 574 | function->x_frame_offset -= size; |
1474e303 JL |
575 | #endif |
576 | ||
a0871656 JH |
577 | /* Ignore alignment we can't do with expected alignment of the boundary. */ |
578 | if (alignment * BITS_PER_UNIT > PREFERRED_STACK_BOUNDARY) | |
579 | alignment = PREFERRED_STACK_BOUNDARY / BITS_PER_UNIT; | |
580 | ||
581 | if (function->stack_alignment_needed < alignment * BITS_PER_UNIT) | |
582 | function->stack_alignment_needed = alignment * BITS_PER_UNIT; | |
583 | ||
6f086dfc RS |
584 | /* Round frame offset to that alignment. |
585 | We must be careful here, since FRAME_OFFSET might be negative and | |
586 | division with a negative dividend isn't as well defined as we might | |
587 | like. So we instead assume that ALIGNMENT is a power of two and | |
588 | use logical operations which are unambiguous. */ | |
589 | #ifdef FRAME_GROWS_DOWNWARD | |
e2ecd91c | 590 | function->x_frame_offset = FLOOR_ROUND (function->x_frame_offset, alignment); |
6f086dfc | 591 | #else |
e2ecd91c | 592 | function->x_frame_offset = CEIL_ROUND (function->x_frame_offset, alignment); |
6f086dfc RS |
593 | #endif |
594 | ||
595 | /* On a big-endian machine, if we are allocating more space than we will use, | |
596 | use the least significant bytes of those that are allocated. */ | |
f76b9db2 | 597 | if (BYTES_BIG_ENDIAN && mode != BLKmode) |
6f086dfc | 598 | bigend_correction = size - GET_MODE_SIZE (mode); |
6f086dfc | 599 | |
6f086dfc RS |
600 | /* If we have already instantiated virtual registers, return the actual |
601 | address relative to the frame pointer. */ | |
01d939e8 | 602 | if (function == cfun && virtuals_instantiated) |
6f086dfc RS |
603 | addr = plus_constant (frame_pointer_rtx, |
604 | (frame_offset + bigend_correction | |
605 | + STARTING_FRAME_OFFSET)); | |
606 | else | |
607 | addr = plus_constant (virtual_stack_vars_rtx, | |
3b71623b | 608 | function->x_frame_offset + bigend_correction); |
6f086dfc RS |
609 | |
610 | #ifndef FRAME_GROWS_DOWNWARD | |
e2ecd91c | 611 | function->x_frame_offset += size; |
6f086dfc RS |
612 | #endif |
613 | ||
38a448ca | 614 | x = gen_rtx_MEM (mode, addr); |
6f086dfc | 615 | |
e2ecd91c BS |
616 | function->x_stack_slot_list |
617 | = gen_rtx_EXPR_LIST (VOIDmode, x, function->x_stack_slot_list); | |
618 | ||
6f086dfc RS |
619 | return x; |
620 | } | |
621 | ||
e2ecd91c BS |
622 | /* Wrapper around assign_stack_local_1; assign a local stack slot for the |
623 | current function. */ | |
3bdf5ad1 | 624 | |
e2ecd91c BS |
625 | rtx |
626 | assign_stack_local (mode, size, align) | |
6f086dfc | 627 | enum machine_mode mode; |
e5e809f4 | 628 | HOST_WIDE_INT size; |
6f086dfc | 629 | int align; |
6f086dfc | 630 | { |
01d939e8 | 631 | return assign_stack_local_1 (mode, size, align, cfun); |
6f086dfc RS |
632 | } |
633 | \f | |
634 | /* Allocate a temporary stack slot and record it for possible later | |
635 | reuse. | |
636 | ||
637 | MODE is the machine mode to be given to the returned rtx. | |
638 | ||
639 | SIZE is the size in units of the space required. We do no rounding here | |
640 | since assign_stack_local will do any required rounding. | |
641 | ||
d93d4205 MS |
642 | KEEP is 1 if this slot is to be retained after a call to |
643 | free_temp_slots. Automatic variables for a block are allocated | |
e5e809f4 JL |
644 | with this flag. KEEP is 2 if we allocate a longer term temporary, |
645 | whose lifetime is controlled by CLEANUP_POINT_EXPRs. KEEP is 3 | |
646 | if we are to allocate something at an inner level to be treated as | |
718fe406 | 647 | a variable in the block (e.g., a SAVE_EXPR). |
a4c6502a MM |
648 | |
649 | TYPE is the type that will be used for the stack slot. */ | |
6f086dfc | 650 | |
d16790f2 JW |
651 | static rtx |
652 | assign_stack_temp_for_type (mode, size, keep, type) | |
6f086dfc | 653 | enum machine_mode mode; |
e5e809f4 | 654 | HOST_WIDE_INT size; |
6f086dfc | 655 | int keep; |
d16790f2 | 656 | tree type; |
6f086dfc | 657 | { |
d16790f2 | 658 | int align; |
3bdf5ad1 | 659 | HOST_WIDE_INT alias_set; |
6f086dfc RS |
660 | struct temp_slot *p, *best_p = 0; |
661 | ||
303ec2aa RK |
662 | /* If SIZE is -1 it means that somebody tried to allocate a temporary |
663 | of a variable size. */ | |
664 | if (size == -1) | |
665 | abort (); | |
666 | ||
a4c6502a MM |
667 | /* If we know the alias set for the memory that will be used, use |
668 | it. If there's no TYPE, then we don't know anything about the | |
669 | alias set for the memory. */ | |
670 | if (type) | |
671 | alias_set = get_alias_set (type); | |
718fe406 | 672 | else |
a4c6502a MM |
673 | alias_set = 0; |
674 | ||
d16790f2 JW |
675 | if (mode == BLKmode) |
676 | align = BIGGEST_ALIGNMENT; | |
dbab7b72 JH |
677 | else |
678 | align = GET_MODE_ALIGNMENT (mode); | |
6f086dfc | 679 | |
d16790f2 JW |
680 | if (! type) |
681 | type = type_for_mode (mode, 0); | |
3bdf5ad1 | 682 | |
d16790f2 JW |
683 | if (type) |
684 | align = LOCAL_ALIGNMENT (type, align); | |
685 | ||
686 | /* Try to find an available, already-allocated temporary of the proper | |
687 | mode which meets the size and alignment requirements. Choose the | |
688 | smallest one with the closest alignment. */ | |
689 | for (p = temp_slots; p; p = p->next) | |
690 | if (p->align >= align && p->size >= size && GET_MODE (p->slot) == mode | |
691 | && ! p->in_use | |
3bdf5ad1 | 692 | && (! flag_strict_aliasing |
a4c6502a | 693 | || (alias_set && p->alias_set == alias_set)) |
d16790f2 JW |
694 | && (best_p == 0 || best_p->size > p->size |
695 | || (best_p->size == p->size && best_p->align > p->align))) | |
696 | { | |
697 | if (p->align == align && p->size == size) | |
698 | { | |
699 | best_p = 0; | |
700 | break; | |
701 | } | |
6f086dfc | 702 | best_p = p; |
d16790f2 | 703 | } |
6f086dfc RS |
704 | |
705 | /* Make our best, if any, the one to use. */ | |
706 | if (best_p) | |
a45035b6 JW |
707 | { |
708 | /* If there are enough aligned bytes left over, make them into a new | |
709 | temp_slot so that the extra bytes don't get wasted. Do this only | |
710 | for BLKmode slots, so that we can be sure of the alignment. */ | |
3bdf5ad1 | 711 | if (GET_MODE (best_p->slot) == BLKmode) |
a45035b6 | 712 | { |
d16790f2 | 713 | int alignment = best_p->align / BITS_PER_UNIT; |
e5e809f4 | 714 | HOST_WIDE_INT rounded_size = CEIL_ROUND (size, alignment); |
a45035b6 JW |
715 | |
716 | if (best_p->size - rounded_size >= alignment) | |
717 | { | |
bedda2da | 718 | p = (struct temp_slot *) xmalloc (sizeof (struct temp_slot)); |
a25d4ba2 | 719 | p->in_use = p->addr_taken = 0; |
a45035b6 | 720 | p->size = best_p->size - rounded_size; |
307d8cd6 RK |
721 | p->base_offset = best_p->base_offset + rounded_size; |
722 | p->full_size = best_p->full_size - rounded_size; | |
38a448ca RH |
723 | p->slot = gen_rtx_MEM (BLKmode, |
724 | plus_constant (XEXP (best_p->slot, 0), | |
725 | rounded_size)); | |
d16790f2 | 726 | p->align = best_p->align; |
e5e76139 | 727 | p->address = 0; |
591ccf92 | 728 | p->rtl_expr = 0; |
3bdf5ad1 | 729 | p->alias_set = best_p->alias_set; |
a45035b6 JW |
730 | p->next = temp_slots; |
731 | temp_slots = p; | |
732 | ||
38a448ca RH |
733 | stack_slot_list = gen_rtx_EXPR_LIST (VOIDmode, p->slot, |
734 | stack_slot_list); | |
a45035b6 JW |
735 | |
736 | best_p->size = rounded_size; | |
291dde90 | 737 | best_p->full_size = rounded_size; |
a45035b6 JW |
738 | } |
739 | } | |
740 | ||
741 | p = best_p; | |
742 | } | |
718fe406 | 743 | |
6f086dfc RS |
744 | /* If we still didn't find one, make a new temporary. */ |
745 | if (p == 0) | |
746 | { | |
e5e809f4 JL |
747 | HOST_WIDE_INT frame_offset_old = frame_offset; |
748 | ||
bedda2da | 749 | p = (struct temp_slot *) xmalloc (sizeof (struct temp_slot)); |
e5e809f4 | 750 | |
c87a0a39 JL |
751 | /* We are passing an explicit alignment request to assign_stack_local. |
752 | One side effect of that is assign_stack_local will not round SIZE | |
753 | to ensure the frame offset remains suitably aligned. | |
754 | ||
755 | So for requests which depended on the rounding of SIZE, we go ahead | |
756 | and round it now. We also make sure ALIGNMENT is at least | |
757 | BIGGEST_ALIGNMENT. */ | |
010529e5 | 758 | if (mode == BLKmode && align < BIGGEST_ALIGNMENT) |
6f67a30d JW |
759 | abort(); |
760 | p->slot = assign_stack_local (mode, | |
010529e5 AS |
761 | (mode == BLKmode |
762 | ? CEIL_ROUND (size, align / BITS_PER_UNIT) | |
763 | : size), | |
6f67a30d | 764 | align); |
d16790f2 JW |
765 | |
766 | p->align = align; | |
a4c6502a | 767 | p->alias_set = alias_set; |
e5e809f4 | 768 | |
b2a80c0d DE |
769 | /* The following slot size computation is necessary because we don't |
770 | know the actual size of the temporary slot until assign_stack_local | |
771 | has performed all the frame alignment and size rounding for the | |
fc91b0d0 RK |
772 | requested temporary. Note that extra space added for alignment |
773 | can be either above or below this stack slot depending on which | |
774 | way the frame grows. We include the extra space if and only if it | |
775 | is above this slot. */ | |
b2a80c0d DE |
776 | #ifdef FRAME_GROWS_DOWNWARD |
777 | p->size = frame_offset_old - frame_offset; | |
778 | #else | |
fc91b0d0 RK |
779 | p->size = size; |
780 | #endif | |
e5e809f4 | 781 | |
fc91b0d0 RK |
782 | /* Now define the fields used by combine_temp_slots. */ |
783 | #ifdef FRAME_GROWS_DOWNWARD | |
784 | p->base_offset = frame_offset; | |
785 | p->full_size = frame_offset_old - frame_offset; | |
786 | #else | |
787 | p->base_offset = frame_offset_old; | |
788 | p->full_size = frame_offset - frame_offset_old; | |
b2a80c0d | 789 | #endif |
e5e76139 | 790 | p->address = 0; |
6f086dfc RS |
791 | p->next = temp_slots; |
792 | temp_slots = p; | |
793 | } | |
794 | ||
795 | p->in_use = 1; | |
a25d4ba2 | 796 | p->addr_taken = 0; |
591ccf92 | 797 | p->rtl_expr = seq_rtl_expr; |
a25d4ba2 | 798 | |
d93d4205 MS |
799 | if (keep == 2) |
800 | { | |
801 | p->level = target_temp_slot_level; | |
802 | p->keep = 0; | |
803 | } | |
e5e809f4 JL |
804 | else if (keep == 3) |
805 | { | |
806 | p->level = var_temp_slot_level; | |
807 | p->keep = 0; | |
808 | } | |
d93d4205 MS |
809 | else |
810 | { | |
811 | p->level = temp_slot_level; | |
812 | p->keep = keep; | |
813 | } | |
1995f267 RK |
814 | |
815 | /* We may be reusing an old slot, so clear any MEM flags that may have been | |
816 | set from before. */ | |
817 | RTX_UNCHANGING_P (p->slot) = 0; | |
818 | MEM_IN_STRUCT_P (p->slot) = 0; | |
c6df88cb | 819 | MEM_SCALAR_P (p->slot) = 0; |
3bdf5ad1 RK |
820 | MEM_ALIAS_SET (p->slot) = alias_set; |
821 | ||
822 | if (type != 0) | |
823 | MEM_SET_IN_STRUCT_P (p->slot, AGGREGATE_TYPE_P (type)); | |
824 | ||
6f086dfc RS |
825 | return p->slot; |
826 | } | |
d16790f2 JW |
827 | |
828 | /* Allocate a temporary stack slot and record it for possible later | |
829 | reuse. First three arguments are same as in preceding function. */ | |
830 | ||
831 | rtx | |
832 | assign_stack_temp (mode, size, keep) | |
833 | enum machine_mode mode; | |
834 | HOST_WIDE_INT size; | |
835 | int keep; | |
836 | { | |
837 | return assign_stack_temp_for_type (mode, size, keep, NULL_TREE); | |
838 | } | |
638141a6 | 839 | \f |
230f21b4 PB |
840 | /* Assign a temporary of given TYPE. |
841 | KEEP is as for assign_stack_temp. | |
842 | MEMORY_REQUIRED is 1 if the result must be addressable stack memory; | |
b55d9ff8 RK |
843 | it is 0 if a register is OK. |
844 | DONT_PROMOTE is 1 if we should not promote values in register | |
845 | to wider modes. */ | |
230f21b4 PB |
846 | |
847 | rtx | |
b55d9ff8 | 848 | assign_temp (type, keep, memory_required, dont_promote) |
230f21b4 PB |
849 | tree type; |
850 | int keep; | |
851 | int memory_required; | |
0ce8a59c | 852 | int dont_promote ATTRIBUTE_UNUSED; |
230f21b4 PB |
853 | { |
854 | enum machine_mode mode = TYPE_MODE (type); | |
0ce8a59c | 855 | #ifndef PROMOTE_FOR_CALL_ONLY |
638141a6 | 856 | int unsignedp = TREE_UNSIGNED (type); |
0ce8a59c | 857 | #endif |
638141a6 | 858 | |
230f21b4 PB |
859 | if (mode == BLKmode || memory_required) |
860 | { | |
e5e809f4 | 861 | HOST_WIDE_INT size = int_size_in_bytes (type); |
230f21b4 PB |
862 | rtx tmp; |
863 | ||
44affdae JH |
864 | /* Zero sized arrays are GNU C extension. Set size to 1 to avoid |
865 | problems with allocating the stack space. */ | |
866 | if (size == 0) | |
867 | size = 1; | |
868 | ||
230f21b4 PB |
869 | /* Unfortunately, we don't yet know how to allocate variable-sized |
870 | temporaries. However, sometimes we have a fixed upper limit on | |
871 | the size (which is stored in TYPE_ARRAY_MAX_SIZE) and can use that | |
0f41302f | 872 | instead. This is the case for Chill variable-sized strings. */ |
230f21b4 PB |
873 | if (size == -1 && TREE_CODE (type) == ARRAY_TYPE |
874 | && TYPE_ARRAY_MAX_SIZE (type) != NULL_TREE | |
3bdf5ad1 RK |
875 | && host_integerp (TYPE_ARRAY_MAX_SIZE (type), 1)) |
876 | size = tree_low_cst (TYPE_ARRAY_MAX_SIZE (type), 1); | |
230f21b4 | 877 | |
d16790f2 | 878 | tmp = assign_stack_temp_for_type (mode, size, keep, type); |
230f21b4 PB |
879 | return tmp; |
880 | } | |
638141a6 | 881 | |
230f21b4 | 882 | #ifndef PROMOTE_FOR_CALL_ONLY |
b55d9ff8 RK |
883 | if (! dont_promote) |
884 | mode = promote_mode (type, mode, &unsignedp, 0); | |
230f21b4 | 885 | #endif |
638141a6 | 886 | |
230f21b4 PB |
887 | return gen_reg_rtx (mode); |
888 | } | |
638141a6 | 889 | \f |
a45035b6 JW |
890 | /* Combine temporary stack slots which are adjacent on the stack. |
891 | ||
892 | This allows for better use of already allocated stack space. This is only | |
893 | done for BLKmode slots because we can be sure that we won't have alignment | |
894 | problems in this case. */ | |
895 | ||
896 | void | |
897 | combine_temp_slots () | |
898 | { | |
899 | struct temp_slot *p, *q; | |
900 | struct temp_slot *prev_p, *prev_q; | |
e5e809f4 JL |
901 | int num_slots; |
902 | ||
a4c6502a MM |
903 | /* We can't combine slots, because the information about which slot |
904 | is in which alias set will be lost. */ | |
905 | if (flag_strict_aliasing) | |
906 | return; | |
907 | ||
718fe406 | 908 | /* If there are a lot of temp slots, don't do anything unless |
e5e809f4 JL |
909 | high levels of optimizaton. */ |
910 | if (! flag_expensive_optimizations) | |
911 | for (p = temp_slots, num_slots = 0; p; p = p->next, num_slots++) | |
912 | if (num_slots > 100 || (num_slots > 10 && optimize == 0)) | |
913 | return; | |
a45035b6 | 914 | |
e9b7093a RS |
915 | for (p = temp_slots, prev_p = 0; p; p = prev_p ? prev_p->next : temp_slots) |
916 | { | |
917 | int delete_p = 0; | |
e5e809f4 | 918 | |
e9b7093a RS |
919 | if (! p->in_use && GET_MODE (p->slot) == BLKmode) |
920 | for (q = p->next, prev_q = p; q; q = prev_q->next) | |
a45035b6 | 921 | { |
e9b7093a RS |
922 | int delete_q = 0; |
923 | if (! q->in_use && GET_MODE (q->slot) == BLKmode) | |
a45035b6 | 924 | { |
fc91b0d0 | 925 | if (p->base_offset + p->full_size == q->base_offset) |
e9b7093a RS |
926 | { |
927 | /* Q comes after P; combine Q into P. */ | |
928 | p->size += q->size; | |
307d8cd6 | 929 | p->full_size += q->full_size; |
e9b7093a RS |
930 | delete_q = 1; |
931 | } | |
fc91b0d0 | 932 | else if (q->base_offset + q->full_size == p->base_offset) |
e9b7093a RS |
933 | { |
934 | /* P comes after Q; combine P into Q. */ | |
935 | q->size += p->size; | |
307d8cd6 | 936 | q->full_size += p->full_size; |
e9b7093a RS |
937 | delete_p = 1; |
938 | break; | |
939 | } | |
a45035b6 | 940 | } |
e9b7093a RS |
941 | /* Either delete Q or advance past it. */ |
942 | if (delete_q) | |
bedda2da MM |
943 | { |
944 | prev_q->next = q->next; | |
945 | free (q); | |
946 | } | |
e9b7093a RS |
947 | else |
948 | prev_q = q; | |
a45035b6 | 949 | } |
e9b7093a RS |
950 | /* Either delete P or advance past it. */ |
951 | if (delete_p) | |
952 | { | |
953 | if (prev_p) | |
954 | prev_p->next = p->next; | |
955 | else | |
956 | temp_slots = p->next; | |
957 | } | |
958 | else | |
959 | prev_p = p; | |
960 | } | |
a45035b6 | 961 | } |
6f086dfc | 962 | \f |
e5e76139 RK |
963 | /* Find the temp slot corresponding to the object at address X. */ |
964 | ||
965 | static struct temp_slot * | |
966 | find_temp_slot_from_address (x) | |
967 | rtx x; | |
968 | { | |
969 | struct temp_slot *p; | |
970 | rtx next; | |
971 | ||
972 | for (p = temp_slots; p; p = p->next) | |
973 | { | |
974 | if (! p->in_use) | |
975 | continue; | |
e5e809f4 | 976 | |
e5e76139 | 977 | else if (XEXP (p->slot, 0) == x |
abb52246 RK |
978 | || p->address == x |
979 | || (GET_CODE (x) == PLUS | |
980 | && XEXP (x, 0) == virtual_stack_vars_rtx | |
981 | && GET_CODE (XEXP (x, 1)) == CONST_INT | |
982 | && INTVAL (XEXP (x, 1)) >= p->base_offset | |
983 | && INTVAL (XEXP (x, 1)) < p->base_offset + p->full_size)) | |
e5e76139 RK |
984 | return p; |
985 | ||
986 | else if (p->address != 0 && GET_CODE (p->address) == EXPR_LIST) | |
987 | for (next = p->address; next; next = XEXP (next, 1)) | |
988 | if (XEXP (next, 0) == x) | |
989 | return p; | |
990 | } | |
991 | ||
14a774a9 RK |
992 | /* If we have a sum involving a register, see if it points to a temp |
993 | slot. */ | |
994 | if (GET_CODE (x) == PLUS && GET_CODE (XEXP (x, 0)) == REG | |
995 | && (p = find_temp_slot_from_address (XEXP (x, 0))) != 0) | |
996 | return p; | |
997 | else if (GET_CODE (x) == PLUS && GET_CODE (XEXP (x, 1)) == REG | |
998 | && (p = find_temp_slot_from_address (XEXP (x, 1))) != 0) | |
999 | return p; | |
1000 | ||
e5e76139 RK |
1001 | return 0; |
1002 | } | |
718fe406 | 1003 | |
9faa82d8 | 1004 | /* Indicate that NEW is an alternate way of referring to the temp slot |
e5e809f4 | 1005 | that previously was known by OLD. */ |
e5e76139 RK |
1006 | |
1007 | void | |
1008 | update_temp_slot_address (old, new) | |
1009 | rtx old, new; | |
1010 | { | |
14a774a9 | 1011 | struct temp_slot *p; |
e5e76139 | 1012 | |
14a774a9 | 1013 | if (rtx_equal_p (old, new)) |
e5e76139 | 1014 | return; |
14a774a9 RK |
1015 | |
1016 | p = find_temp_slot_from_address (old); | |
1017 | ||
700f19f0 RK |
1018 | /* If we didn't find one, see if both OLD is a PLUS. If so, and NEW |
1019 | is a register, see if one operand of the PLUS is a temporary | |
1020 | location. If so, NEW points into it. Otherwise, if both OLD and | |
1021 | NEW are a PLUS and if there is a register in common between them. | |
1022 | If so, try a recursive call on those values. */ | |
14a774a9 RK |
1023 | if (p == 0) |
1024 | { | |
700f19f0 RK |
1025 | if (GET_CODE (old) != PLUS) |
1026 | return; | |
1027 | ||
1028 | if (GET_CODE (new) == REG) | |
1029 | { | |
1030 | update_temp_slot_address (XEXP (old, 0), new); | |
1031 | update_temp_slot_address (XEXP (old, 1), new); | |
1032 | return; | |
1033 | } | |
1034 | else if (GET_CODE (new) != PLUS) | |
14a774a9 RK |
1035 | return; |
1036 | ||
1037 | if (rtx_equal_p (XEXP (old, 0), XEXP (new, 0))) | |
1038 | update_temp_slot_address (XEXP (old, 1), XEXP (new, 1)); | |
1039 | else if (rtx_equal_p (XEXP (old, 1), XEXP (new, 0))) | |
1040 | update_temp_slot_address (XEXP (old, 0), XEXP (new, 1)); | |
1041 | else if (rtx_equal_p (XEXP (old, 0), XEXP (new, 1))) | |
1042 | update_temp_slot_address (XEXP (old, 1), XEXP (new, 0)); | |
1043 | else if (rtx_equal_p (XEXP (old, 1), XEXP (new, 1))) | |
1044 | update_temp_slot_address (XEXP (old, 0), XEXP (new, 0)); | |
1045 | ||
1046 | return; | |
1047 | } | |
1048 | ||
718fe406 | 1049 | /* Otherwise add an alias for the temp's address. */ |
e5e76139 RK |
1050 | else if (p->address == 0) |
1051 | p->address = new; | |
1052 | else | |
1053 | { | |
1054 | if (GET_CODE (p->address) != EXPR_LIST) | |
38a448ca | 1055 | p->address = gen_rtx_EXPR_LIST (VOIDmode, p->address, NULL_RTX); |
e5e76139 | 1056 | |
38a448ca | 1057 | p->address = gen_rtx_EXPR_LIST (VOIDmode, new, p->address); |
e5e76139 RK |
1058 | } |
1059 | } | |
1060 | ||
a25d4ba2 | 1061 | /* If X could be a reference to a temporary slot, mark the fact that its |
9faa82d8 | 1062 | address was taken. */ |
a25d4ba2 RK |
1063 | |
1064 | void | |
1065 | mark_temp_addr_taken (x) | |
1066 | rtx x; | |
1067 | { | |
1068 | struct temp_slot *p; | |
1069 | ||
1070 | if (x == 0) | |
1071 | return; | |
1072 | ||
1073 | /* If X is not in memory or is at a constant address, it cannot be in | |
1074 | a temporary slot. */ | |
1075 | if (GET_CODE (x) != MEM || CONSTANT_P (XEXP (x, 0))) | |
1076 | return; | |
1077 | ||
1078 | p = find_temp_slot_from_address (XEXP (x, 0)); | |
1079 | if (p != 0) | |
1080 | p->addr_taken = 1; | |
1081 | } | |
1082 | ||
9cca6a99 MS |
1083 | /* If X could be a reference to a temporary slot, mark that slot as |
1084 | belonging to the to one level higher than the current level. If X | |
1085 | matched one of our slots, just mark that one. Otherwise, we can't | |
1086 | easily predict which it is, so upgrade all of them. Kept slots | |
1087 | need not be touched. | |
6f086dfc RS |
1088 | |
1089 | This is called when an ({...}) construct occurs and a statement | |
1090 | returns a value in memory. */ | |
1091 | ||
1092 | void | |
1093 | preserve_temp_slots (x) | |
1094 | rtx x; | |
1095 | { | |
a25d4ba2 | 1096 | struct temp_slot *p = 0; |
6f086dfc | 1097 | |
73620b82 RK |
1098 | /* If there is no result, we still might have some objects whose address |
1099 | were taken, so we need to make sure they stay around. */ | |
e3a77161 | 1100 | if (x == 0) |
73620b82 RK |
1101 | { |
1102 | for (p = temp_slots; p; p = p->next) | |
1103 | if (p->in_use && p->level == temp_slot_level && p->addr_taken) | |
1104 | p->level--; | |
1105 | ||
1106 | return; | |
1107 | } | |
e3a77161 RK |
1108 | |
1109 | /* If X is a register that is being used as a pointer, see if we have | |
1110 | a temporary slot we know it points to. To be consistent with | |
1111 | the code below, we really should preserve all non-kept slots | |
1112 | if we can't find a match, but that seems to be much too costly. */ | |
a25d4ba2 RK |
1113 | if (GET_CODE (x) == REG && REGNO_POINTER_FLAG (REGNO (x))) |
1114 | p = find_temp_slot_from_address (x); | |
1115 | ||
6f086dfc | 1116 | /* If X is not in memory or is at a constant address, it cannot be in |
e19571db RK |
1117 | a temporary slot, but it can contain something whose address was |
1118 | taken. */ | |
a25d4ba2 | 1119 | if (p == 0 && (GET_CODE (x) != MEM || CONSTANT_P (XEXP (x, 0)))) |
e19571db RK |
1120 | { |
1121 | for (p = temp_slots; p; p = p->next) | |
1122 | if (p->in_use && p->level == temp_slot_level && p->addr_taken) | |
1123 | p->level--; | |
1124 | ||
1125 | return; | |
1126 | } | |
6f086dfc RS |
1127 | |
1128 | /* First see if we can find a match. */ | |
73620b82 | 1129 | if (p == 0) |
a25d4ba2 RK |
1130 | p = find_temp_slot_from_address (XEXP (x, 0)); |
1131 | ||
e5e76139 RK |
1132 | if (p != 0) |
1133 | { | |
a25d4ba2 RK |
1134 | /* Move everything at our level whose address was taken to our new |
1135 | level in case we used its address. */ | |
1136 | struct temp_slot *q; | |
1137 | ||
9cca6a99 MS |
1138 | if (p->level == temp_slot_level) |
1139 | { | |
1140 | for (q = temp_slots; q; q = q->next) | |
1141 | if (q != p && q->addr_taken && q->level == p->level) | |
1142 | q->level--; | |
a25d4ba2 | 1143 | |
9cca6a99 MS |
1144 | p->level--; |
1145 | p->addr_taken = 0; | |
1146 | } | |
e5e76139 RK |
1147 | return; |
1148 | } | |
6f086dfc RS |
1149 | |
1150 | /* Otherwise, preserve all non-kept slots at this level. */ | |
1151 | for (p = temp_slots; p; p = p->next) | |
1152 | if (p->in_use && p->level == temp_slot_level && ! p->keep) | |
1153 | p->level--; | |
1154 | } | |
1155 | ||
591ccf92 MM |
1156 | /* X is the result of an RTL_EXPR. If it is a temporary slot associated |
1157 | with that RTL_EXPR, promote it into a temporary slot at the present | |
1158 | level so it will not be freed when we free slots made in the | |
1159 | RTL_EXPR. */ | |
1160 | ||
1161 | void | |
1162 | preserve_rtl_expr_result (x) | |
1163 | rtx x; | |
1164 | { | |
1165 | struct temp_slot *p; | |
1166 | ||
1167 | /* If X is not in memory or is at a constant address, it cannot be in | |
1168 | a temporary slot. */ | |
1169 | if (x == 0 || GET_CODE (x) != MEM || CONSTANT_P (XEXP (x, 0))) | |
1170 | return; | |
1171 | ||
1172 | /* If we can find a match, move it to our level unless it is already at | |
1173 | an upper level. */ | |
1174 | p = find_temp_slot_from_address (XEXP (x, 0)); | |
64dc53f3 MM |
1175 | if (p != 0) |
1176 | { | |
1177 | p->level = MIN (p->level, temp_slot_level); | |
1178 | p->rtl_expr = 0; | |
1179 | } | |
591ccf92 MM |
1180 | |
1181 | return; | |
1182 | } | |
1183 | ||
6f086dfc | 1184 | /* Free all temporaries used so far. This is normally called at the end |
e7a84011 RK |
1185 | of generating code for a statement. Don't free any temporaries |
1186 | currently in use for an RTL_EXPR that hasn't yet been emitted. | |
1187 | We could eventually do better than this since it can be reused while | |
1188 | generating the same RTL_EXPR, but this is complex and probably not | |
1189 | worthwhile. */ | |
6f086dfc RS |
1190 | |
1191 | void | |
1192 | free_temp_slots () | |
1193 | { | |
1194 | struct temp_slot *p; | |
1195 | ||
1196 | for (p = temp_slots; p; p = p->next) | |
591ccf92 MM |
1197 | if (p->in_use && p->level == temp_slot_level && ! p->keep |
1198 | && p->rtl_expr == 0) | |
1199 | p->in_use = 0; | |
1200 | ||
1201 | combine_temp_slots (); | |
1202 | } | |
1203 | ||
1204 | /* Free all temporary slots used in T, an RTL_EXPR node. */ | |
1205 | ||
1206 | void | |
1207 | free_temps_for_rtl_expr (t) | |
1208 | tree t; | |
1209 | { | |
1210 | struct temp_slot *p; | |
1211 | ||
1212 | for (p = temp_slots; p; p = p->next) | |
1213 | if (p->rtl_expr == t) | |
64dc53f3 MM |
1214 | { |
1215 | /* If this slot is below the current TEMP_SLOT_LEVEL, then it | |
1216 | needs to be preserved. This can happen if a temporary in | |
1217 | the RTL_EXPR was addressed; preserve_temp_slots will move | |
1218 | the temporary into a higher level. */ | |
1219 | if (temp_slot_level <= p->level) | |
1220 | p->in_use = 0; | |
1221 | else | |
1222 | p->rtl_expr = NULL_TREE; | |
1223 | } | |
a45035b6 JW |
1224 | |
1225 | combine_temp_slots (); | |
6f086dfc RS |
1226 | } |
1227 | ||
956d6950 | 1228 | /* Mark all temporaries ever allocated in this function as not suitable |
a94e4054 RK |
1229 | for reuse until the current level is exited. */ |
1230 | ||
1231 | void | |
1232 | mark_all_temps_used () | |
1233 | { | |
1234 | struct temp_slot *p; | |
1235 | ||
1236 | for (p = temp_slots; p; p = p->next) | |
1237 | { | |
85b119d1 | 1238 | p->in_use = p->keep = 1; |
27ce006b | 1239 | p->level = MIN (p->level, temp_slot_level); |
a94e4054 RK |
1240 | } |
1241 | } | |
1242 | ||
6f086dfc RS |
1243 | /* Push deeper into the nesting level for stack temporaries. */ |
1244 | ||
1245 | void | |
1246 | push_temp_slots () | |
1247 | { | |
6f086dfc RS |
1248 | temp_slot_level++; |
1249 | } | |
1250 | ||
e5e809f4 JL |
1251 | /* Likewise, but save the new level as the place to allocate variables |
1252 | for blocks. */ | |
1253 | ||
ca3075bd | 1254 | #if 0 |
e5e809f4 JL |
1255 | void |
1256 | push_temp_slots_for_block () | |
1257 | { | |
1258 | push_temp_slots (); | |
1259 | ||
1260 | var_temp_slot_level = temp_slot_level; | |
1261 | } | |
1262 | ||
f5963e61 JL |
1263 | /* Likewise, but save the new level as the place to allocate temporaries |
1264 | for TARGET_EXPRs. */ | |
1265 | ||
1266 | void | |
1267 | push_temp_slots_for_target () | |
1268 | { | |
1269 | push_temp_slots (); | |
1270 | ||
1271 | target_temp_slot_level = temp_slot_level; | |
1272 | } | |
1273 | ||
1274 | /* Set and get the value of target_temp_slot_level. The only | |
1275 | permitted use of these functions is to save and restore this value. */ | |
1276 | ||
1277 | int | |
1278 | get_target_temp_slot_level () | |
1279 | { | |
1280 | return target_temp_slot_level; | |
1281 | } | |
1282 | ||
1283 | void | |
1284 | set_target_temp_slot_level (level) | |
1285 | int level; | |
1286 | { | |
1287 | target_temp_slot_level = level; | |
1288 | } | |
ca3075bd | 1289 | #endif |
f5963e61 | 1290 | |
6f086dfc RS |
1291 | /* Pop a temporary nesting level. All slots in use in the current level |
1292 | are freed. */ | |
1293 | ||
1294 | void | |
1295 | pop_temp_slots () | |
1296 | { | |
1297 | struct temp_slot *p; | |
1298 | ||
6f086dfc | 1299 | for (p = temp_slots; p; p = p->next) |
591ccf92 | 1300 | if (p->in_use && p->level == temp_slot_level && p->rtl_expr == 0) |
6f086dfc RS |
1301 | p->in_use = 0; |
1302 | ||
a45035b6 JW |
1303 | combine_temp_slots (); |
1304 | ||
6f086dfc RS |
1305 | temp_slot_level--; |
1306 | } | |
bc0ebdf9 RK |
1307 | |
1308 | /* Initialize temporary slots. */ | |
1309 | ||
1310 | void | |
1311 | init_temp_slots () | |
1312 | { | |
1313 | /* We have not allocated any temporaries yet. */ | |
1314 | temp_slots = 0; | |
1315 | temp_slot_level = 0; | |
e5e809f4 | 1316 | var_temp_slot_level = 0; |
bc0ebdf9 RK |
1317 | target_temp_slot_level = 0; |
1318 | } | |
6f086dfc RS |
1319 | \f |
1320 | /* Retroactively move an auto variable from a register to a stack slot. | |
1321 | This is done when an address-reference to the variable is seen. */ | |
1322 | ||
1323 | void | |
1324 | put_var_into_stack (decl) | |
1325 | tree decl; | |
1326 | { | |
1327 | register rtx reg; | |
00d8a4c1 | 1328 | enum machine_mode promoted_mode, decl_mode; |
6f086dfc | 1329 | struct function *function = 0; |
c20bf1f3 | 1330 | tree context; |
e9a25f70 | 1331 | int can_use_addressof; |
c357082f RK |
1332 | int volatilep = TREE_CODE (decl) != SAVE_EXPR && TREE_THIS_VOLATILE (decl); |
1333 | int usedp = (TREE_USED (decl) | |
1334 | || (TREE_CODE (decl) != SAVE_EXPR && DECL_INITIAL (decl) != 0)); | |
c20bf1f3 | 1335 | |
c20bf1f3 | 1336 | context = decl_function_context (decl); |
6f086dfc | 1337 | |
9ec36da5 | 1338 | /* Get the current rtl used for this object and its original mode. */ |
6f086dfc | 1339 | reg = TREE_CODE (decl) == SAVE_EXPR ? SAVE_EXPR_RTL (decl) : DECL_RTL (decl); |
2baccce2 RS |
1340 | |
1341 | /* No need to do anything if decl has no rtx yet | |
1342 | since in that case caller is setting TREE_ADDRESSABLE | |
1343 | and a stack slot will be assigned when the rtl is made. */ | |
1344 | if (reg == 0) | |
1345 | return; | |
00d8a4c1 RK |
1346 | |
1347 | /* Get the declared mode for this object. */ | |
1348 | decl_mode = (TREE_CODE (decl) == SAVE_EXPR ? TYPE_MODE (TREE_TYPE (decl)) | |
1349 | : DECL_MODE (decl)); | |
2baccce2 RS |
1350 | /* Get the mode it's actually stored in. */ |
1351 | promoted_mode = GET_MODE (reg); | |
6f086dfc RS |
1352 | |
1353 | /* If this variable comes from an outer function, | |
1354 | find that function's saved context. */ | |
4ac74fb8 | 1355 | if (context != current_function_decl && context != inline_function_decl) |
6f086dfc RS |
1356 | for (function = outer_function_chain; function; function = function->next) |
1357 | if (function->decl == context) | |
1358 | break; | |
1359 | ||
6f086dfc RS |
1360 | /* If this is a variable-size object with a pseudo to address it, |
1361 | put that pseudo into the stack, if the var is nonlocal. */ | |
c357082f | 1362 | if (TREE_CODE (decl) != SAVE_EXPR && DECL_NONLOCAL (decl) |
6f086dfc RS |
1363 | && GET_CODE (reg) == MEM |
1364 | && GET_CODE (XEXP (reg, 0)) == REG | |
1365 | && REGNO (XEXP (reg, 0)) > LAST_VIRTUAL_REGISTER) | |
4cdb3e78 RS |
1366 | { |
1367 | reg = XEXP (reg, 0); | |
1368 | decl_mode = promoted_mode = GET_MODE (reg); | |
1369 | } | |
e15762df | 1370 | |
e9a25f70 JL |
1371 | can_use_addressof |
1372 | = (function == 0 | |
e5e809f4 | 1373 | && optimize > 0 |
e9a25f70 JL |
1374 | /* FIXME make it work for promoted modes too */ |
1375 | && decl_mode == promoted_mode | |
1376 | #ifdef NON_SAVING_SETJMP | |
1377 | && ! (NON_SAVING_SETJMP && current_function_calls_setjmp) | |
1378 | #endif | |
1379 | ); | |
1380 | ||
1381 | /* If we can't use ADDRESSOF, make sure we see through one we already | |
1382 | generated. */ | |
1383 | if (! can_use_addressof && GET_CODE (reg) == MEM | |
1384 | && GET_CODE (XEXP (reg, 0)) == ADDRESSOF) | |
1385 | reg = XEXP (XEXP (reg, 0), 0); | |
1386 | ||
293e3de4 RS |
1387 | /* Now we should have a value that resides in one or more pseudo regs. */ |
1388 | ||
1389 | if (GET_CODE (reg) == REG) | |
e9a25f70 JL |
1390 | { |
1391 | /* If this variable lives in the current function and we don't need | |
1392 | to put things in the stack for the sake of setjmp, try to keep it | |
1393 | in a register until we know we actually need the address. */ | |
1394 | if (can_use_addressof) | |
1395 | gen_mem_addressof (reg, decl); | |
1396 | else | |
c357082f RK |
1397 | put_reg_into_stack (function, reg, TREE_TYPE (decl), promoted_mode, |
1398 | decl_mode, volatilep, 0, usedp, 0); | |
e9a25f70 | 1399 | } |
293e3de4 RS |
1400 | else if (GET_CODE (reg) == CONCAT) |
1401 | { | |
1402 | /* A CONCAT contains two pseudos; put them both in the stack. | |
018577e4 R |
1403 | We do it so they end up consecutive. |
1404 | We fixup references to the parts only after we fixup references | |
1405 | to the whole CONCAT, lest we do double fixups for the latter | |
1406 | references. */ | |
293e3de4 | 1407 | enum machine_mode part_mode = GET_MODE (XEXP (reg, 0)); |
c3b247b4 | 1408 | tree part_type = type_for_mode (part_mode, 0); |
018577e4 R |
1409 | rtx lopart = XEXP (reg, 0); |
1410 | rtx hipart = XEXP (reg, 1); | |
4738c10d | 1411 | #ifdef FRAME_GROWS_DOWNWARD |
293e3de4 | 1412 | /* Since part 0 should have a lower address, do it second. */ |
018577e4 R |
1413 | put_reg_into_stack (function, hipart, part_type, part_mode, |
1414 | part_mode, volatilep, 0, 0, 0); | |
1415 | put_reg_into_stack (function, lopart, part_type, part_mode, | |
1416 | part_mode, volatilep, 0, 0, 0); | |
293e3de4 | 1417 | #else |
018577e4 R |
1418 | put_reg_into_stack (function, lopart, part_type, part_mode, |
1419 | part_mode, volatilep, 0, 0, 0); | |
1420 | put_reg_into_stack (function, hipart, part_type, part_mode, | |
1421 | part_mode, volatilep, 0, 0, 0); | |
293e3de4 RS |
1422 | #endif |
1423 | ||
1424 | /* Change the CONCAT into a combined MEM for both parts. */ | |
1425 | PUT_CODE (reg, MEM); | |
c357082f | 1426 | set_mem_attributes (reg, decl, 1); |
0006e95b | 1427 | |
293e3de4 RS |
1428 | /* The two parts are in memory order already. |
1429 | Use the lower parts address as ours. */ | |
1430 | XEXP (reg, 0) = XEXP (XEXP (reg, 0), 0); | |
1431 | /* Prevent sharing of rtl that might lose. */ | |
1432 | if (GET_CODE (XEXP (reg, 0)) == PLUS) | |
1433 | XEXP (reg, 0) = copy_rtx (XEXP (reg, 0)); | |
018577e4 R |
1434 | if (usedp) |
1435 | { | |
1436 | schedule_fixup_var_refs (function, reg, TREE_TYPE (decl), | |
1437 | promoted_mode, 0); | |
1438 | schedule_fixup_var_refs (function, lopart, part_type, part_mode, 0); | |
1439 | schedule_fixup_var_refs (function, hipart, part_type, part_mode, 0); | |
1440 | } | |
293e3de4 | 1441 | } |
86fa911a RK |
1442 | else |
1443 | return; | |
718fe406 | 1444 | |
7d384cc0 | 1445 | if (current_function_check_memory_usage) |
ebb1b59a BS |
1446 | emit_library_call (chkr_set_right_libfunc, LCT_CONST_MAKE_BLOCK, VOIDmode, |
1447 | 3, XEXP (reg, 0), Pmode, | |
86fa911a RK |
1448 | GEN_INT (GET_MODE_SIZE (GET_MODE (reg))), |
1449 | TYPE_MODE (sizetype), | |
956d6950 JL |
1450 | GEN_INT (MEMORY_USE_RW), |
1451 | TYPE_MODE (integer_type_node)); | |
293e3de4 RS |
1452 | } |
1453 | ||
1454 | /* Subroutine of put_var_into_stack. This puts a single pseudo reg REG | |
1455 | into the stack frame of FUNCTION (0 means the current function). | |
1456 | DECL_MODE is the machine mode of the user-level data type. | |
0006e95b | 1457 | PROMOTED_MODE is the machine mode of the register. |
e5e809f4 JL |
1458 | VOLATILE_P is nonzero if this is for a "volatile" decl. |
1459 | USED_P is nonzero if this reg might have already been used in an insn. */ | |
293e3de4 RS |
1460 | |
1461 | static void | |
e9a25f70 | 1462 | put_reg_into_stack (function, reg, type, promoted_mode, decl_mode, volatile_p, |
fe9b4957 | 1463 | original_regno, used_p, ht) |
293e3de4 RS |
1464 | struct function *function; |
1465 | rtx reg; | |
1466 | tree type; | |
1467 | enum machine_mode promoted_mode, decl_mode; | |
0006e95b | 1468 | int volatile_p; |
770ae6cc | 1469 | unsigned int original_regno; |
e5e809f4 | 1470 | int used_p; |
fe9b4957 | 1471 | struct hash_table *ht; |
293e3de4 | 1472 | { |
01d939e8 | 1473 | struct function *func = function ? function : cfun; |
293e3de4 | 1474 | rtx new = 0; |
770ae6cc | 1475 | unsigned int regno = original_regno; |
e9a25f70 JL |
1476 | |
1477 | if (regno == 0) | |
1478 | regno = REGNO (reg); | |
6f086dfc | 1479 | |
e2ecd91c BS |
1480 | if (regno < func->x_max_parm_reg) |
1481 | new = func->x_parm_reg_stack_loc[regno]; | |
770ae6cc | 1482 | |
e2ecd91c BS |
1483 | if (new == 0) |
1484 | new = assign_stack_local_1 (decl_mode, GET_MODE_SIZE (decl_mode), 0, func); | |
6f086dfc | 1485 | |
ef178af3 | 1486 | PUT_CODE (reg, MEM); |
0006e95b | 1487 | PUT_MODE (reg, decl_mode); |
6f086dfc RS |
1488 | XEXP (reg, 0) = XEXP (new, 0); |
1489 | /* `volatil' bit means one thing for MEMs, another entirely for REGs. */ | |
0006e95b | 1490 | MEM_VOLATILE_P (reg) = volatile_p; |
6f086dfc RS |
1491 | |
1492 | /* If this is a memory ref that contains aggregate components, | |
bdd3e6ab JW |
1493 | mark it as such for cse and loop optimize. If we are reusing a |
1494 | previously generated stack slot, then we need to copy the bit in | |
1495 | case it was set for other reasons. For instance, it is set for | |
1496 | __builtin_va_alist. */ | |
8b4944fb RH |
1497 | if (type) |
1498 | { | |
1499 | MEM_SET_IN_STRUCT_P (reg, | |
1500 | AGGREGATE_TYPE_P (type) || MEM_IN_STRUCT_P (new)); | |
1501 | MEM_ALIAS_SET (reg) = get_alias_set (type); | |
1502 | } | |
018577e4 R |
1503 | if (used_p) |
1504 | schedule_fixup_var_refs (function, reg, type, promoted_mode, ht); | |
1505 | } | |
6f086dfc | 1506 | |
018577e4 R |
1507 | /* Make sure that all refs to the variable, previously made |
1508 | when it was a register, are fixed up to be valid again. | |
1509 | See function above for meaning of arguments. */ | |
1510 | static void | |
1511 | schedule_fixup_var_refs (function, reg, type, promoted_mode, ht) | |
1512 | struct function *function; | |
1513 | rtx reg; | |
1514 | tree type; | |
1515 | enum machine_mode promoted_mode; | |
1516 | struct hash_table *ht; | |
1517 | { | |
8b4944fb RH |
1518 | int unsigned_p = type ? TREE_UNSIGNED (type) : 0; |
1519 | ||
018577e4 | 1520 | if (function != 0) |
6f086dfc RS |
1521 | { |
1522 | struct var_refs_queue *temp; | |
1523 | ||
6f086dfc | 1524 | temp |
a3770a81 | 1525 | = (struct var_refs_queue *) xmalloc (sizeof (struct var_refs_queue)); |
6f086dfc | 1526 | temp->modified = reg; |
00d8a4c1 | 1527 | temp->promoted_mode = promoted_mode; |
8b4944fb | 1528 | temp->unsignedp = unsigned_p; |
6f086dfc RS |
1529 | temp->next = function->fixup_var_refs_queue; |
1530 | function->fixup_var_refs_queue = temp; | |
6f086dfc | 1531 | } |
018577e4 | 1532 | else |
6f086dfc | 1533 | /* Variable is local; fix it up now. */ |
8b4944fb | 1534 | fixup_var_refs (reg, promoted_mode, unsigned_p, ht); |
6f086dfc RS |
1535 | } |
1536 | \f | |
1537 | static void | |
fe9b4957 | 1538 | fixup_var_refs (var, promoted_mode, unsignedp, ht) |
6f086dfc | 1539 | rtx var; |
00d8a4c1 RK |
1540 | enum machine_mode promoted_mode; |
1541 | int unsignedp; | |
fe9b4957 | 1542 | struct hash_table *ht; |
6f086dfc RS |
1543 | { |
1544 | tree pending; | |
1545 | rtx first_insn = get_insns (); | |
49ad7cfa | 1546 | struct sequence_stack *stack = seq_stack; |
6f086dfc | 1547 | tree rtl_exps = rtl_expr_chain; |
0a1c58a2 | 1548 | rtx insn; |
6f086dfc RS |
1549 | |
1550 | /* Must scan all insns for stack-refs that exceed the limit. */ | |
718fe406 | 1551 | fixup_var_refs_insns (var, promoted_mode, unsignedp, first_insn, |
fe9b4957 MM |
1552 | stack == 0, ht); |
1553 | /* If there's a hash table, it must record all uses of VAR. */ | |
1554 | if (ht) | |
1555 | return; | |
6f086dfc RS |
1556 | |
1557 | /* Scan all pending sequences too. */ | |
1558 | for (; stack; stack = stack->next) | |
1559 | { | |
1560 | push_to_sequence (stack->first); | |
00d8a4c1 | 1561 | fixup_var_refs_insns (var, promoted_mode, unsignedp, |
fe9b4957 | 1562 | stack->first, stack->next != 0, 0); |
6f086dfc RS |
1563 | /* Update remembered end of sequence |
1564 | in case we added an insn at the end. */ | |
1565 | stack->last = get_last_insn (); | |
1566 | end_sequence (); | |
1567 | } | |
1568 | ||
1569 | /* Scan all waiting RTL_EXPRs too. */ | |
1570 | for (pending = rtl_exps; pending; pending = TREE_CHAIN (pending)) | |
1571 | { | |
1572 | rtx seq = RTL_EXPR_SEQUENCE (TREE_VALUE (pending)); | |
1573 | if (seq != const0_rtx && seq != 0) | |
1574 | { | |
1575 | push_to_sequence (seq); | |
718fe406 | 1576 | fixup_var_refs_insns (var, promoted_mode, unsignedp, seq, 0, 0); |
6f086dfc RS |
1577 | end_sequence (); |
1578 | } | |
1579 | } | |
d33c2956 DB |
1580 | |
1581 | /* Scan the catch clauses for exception handling too. */ | |
c14f7160 | 1582 | push_to_full_sequence (catch_clauses, catch_clauses_last); |
718fe406 | 1583 | fixup_var_refs_insns (var, promoted_mode, unsignedp, catch_clauses, 0, 0); |
c14f7160 | 1584 | end_full_sequence (&catch_clauses, &catch_clauses_last); |
0a1c58a2 JL |
1585 | |
1586 | /* Scan sequences saved in CALL_PLACEHOLDERS too. */ | |
1587 | for (insn = first_insn; insn; insn = NEXT_INSN (insn)) | |
1588 | { | |
1589 | if (GET_CODE (insn) == CALL_INSN | |
1590 | && GET_CODE (PATTERN (insn)) == CALL_PLACEHOLDER) | |
1591 | { | |
1592 | int i; | |
1593 | ||
1594 | /* Look at the Normal call, sibling call and tail recursion | |
1595 | sequences attached to the CALL_PLACEHOLDER. */ | |
1596 | for (i = 0; i < 3; i++) | |
1597 | { | |
1598 | rtx seq = XEXP (PATTERN (insn), i); | |
1599 | if (seq) | |
1600 | { | |
1601 | push_to_sequence (seq); | |
1602 | fixup_var_refs_insns (var, promoted_mode, unsignedp, | |
1603 | seq, 0, 0); | |
1604 | XEXP (PATTERN (insn), i) = get_insns (); | |
1605 | end_sequence (); | |
1606 | } | |
1607 | } | |
1608 | } | |
1609 | } | |
6f086dfc RS |
1610 | } |
1611 | \f | |
e15679f8 | 1612 | /* REPLACEMENTS is a pointer to a list of the struct fixup_replacement and X is |
6f086dfc | 1613 | some part of an insn. Return a struct fixup_replacement whose OLD |
0f41302f | 1614 | value is equal to X. Allocate a new structure if no such entry exists. */ |
6f086dfc RS |
1615 | |
1616 | static struct fixup_replacement * | |
2740a678 | 1617 | find_fixup_replacement (replacements, x) |
6f086dfc RS |
1618 | struct fixup_replacement **replacements; |
1619 | rtx x; | |
1620 | { | |
1621 | struct fixup_replacement *p; | |
1622 | ||
1623 | /* See if we have already replaced this. */ | |
c5c76735 | 1624 | for (p = *replacements; p != 0 && ! rtx_equal_p (p->old, x); p = p->next) |
6f086dfc RS |
1625 | ; |
1626 | ||
1627 | if (p == 0) | |
1628 | { | |
1f8f4a0b | 1629 | p = (struct fixup_replacement *) xmalloc (sizeof (struct fixup_replacement)); |
6f086dfc RS |
1630 | p->old = x; |
1631 | p->new = 0; | |
1632 | p->next = *replacements; | |
1633 | *replacements = p; | |
1634 | } | |
1635 | ||
1636 | return p; | |
1637 | } | |
1638 | ||
1639 | /* Scan the insn-chain starting with INSN for refs to VAR | |
1640 | and fix them up. TOPLEVEL is nonzero if this chain is the | |
1641 | main chain of insns for the current function. */ | |
1642 | ||
1643 | static void | |
fe9b4957 | 1644 | fixup_var_refs_insns (var, promoted_mode, unsignedp, insn, toplevel, ht) |
6f086dfc | 1645 | rtx var; |
00d8a4c1 RK |
1646 | enum machine_mode promoted_mode; |
1647 | int unsignedp; | |
6f086dfc RS |
1648 | rtx insn; |
1649 | int toplevel; | |
fe9b4957 | 1650 | struct hash_table *ht; |
6f086dfc | 1651 | { |
02a10449 | 1652 | rtx call_dest = 0; |
07444f1d | 1653 | rtx insn_list = NULL_RTX; |
fe9b4957 MM |
1654 | |
1655 | /* If we already know which INSNs reference VAR there's no need | |
1656 | to walk the entire instruction chain. */ | |
1657 | if (ht) | |
1658 | { | |
718fe406 | 1659 | insn_list = ((struct insns_for_mem_entry *) |
fe9b4957 MM |
1660 | hash_lookup (ht, var, /*create=*/0, /*copy=*/0))->insns; |
1661 | insn = insn_list ? XEXP (insn_list, 0) : NULL_RTX; | |
1662 | insn_list = XEXP (insn_list, 1); | |
1663 | } | |
02a10449 | 1664 | |
6f086dfc RS |
1665 | while (insn) |
1666 | { | |
1667 | rtx next = NEXT_INSN (insn); | |
e5e809f4 | 1668 | rtx set, prev, prev_set; |
6f086dfc | 1669 | rtx note; |
e5e809f4 | 1670 | |
2c3c49de | 1671 | if (INSN_P (insn)) |
6f086dfc | 1672 | { |
ef178af3 ZW |
1673 | /* Remember the notes in case we delete the insn. */ |
1674 | note = REG_NOTES (insn); | |
1675 | ||
63770d6a RK |
1676 | /* If this is a CLOBBER of VAR, delete it. |
1677 | ||
1678 | If it has a REG_LIBCALL note, delete the REG_LIBCALL | |
1679 | and REG_RETVAL notes too. */ | |
718fe406 | 1680 | if (GET_CODE (PATTERN (insn)) == CLOBBER |
07362cb3 JW |
1681 | && (XEXP (PATTERN (insn), 0) == var |
1682 | || (GET_CODE (XEXP (PATTERN (insn), 0)) == CONCAT | |
1683 | && (XEXP (XEXP (PATTERN (insn), 0), 0) == var | |
1684 | || XEXP (XEXP (PATTERN (insn), 0), 1) == var)))) | |
63770d6a RK |
1685 | { |
1686 | if ((note = find_reg_note (insn, REG_LIBCALL, NULL_RTX)) != 0) | |
1687 | /* The REG_LIBCALL note will go away since we are going to | |
1688 | turn INSN into a NOTE, so just delete the | |
1689 | corresponding REG_RETVAL note. */ | |
1690 | remove_note (XEXP (note, 0), | |
1691 | find_reg_note (XEXP (note, 0), REG_RETVAL, | |
1692 | NULL_RTX)); | |
1693 | ||
1694 | /* In unoptimized compilation, we shouldn't call delete_insn | |
1695 | except in jump.c doing warnings. */ | |
1696 | PUT_CODE (insn, NOTE); | |
1697 | NOTE_LINE_NUMBER (insn) = NOTE_INSN_DELETED; | |
1698 | NOTE_SOURCE_FILE (insn) = 0; | |
1699 | } | |
1700 | ||
6f086dfc | 1701 | /* The insn to load VAR from a home in the arglist |
e5e809f4 JL |
1702 | is now a no-op. When we see it, just delete it. |
1703 | Similarly if this is storing VAR from a register from which | |
1704 | it was loaded in the previous insn. This will occur | |
1705 | when an ADDRESSOF was made for an arglist slot. */ | |
63770d6a | 1706 | else if (toplevel |
e5e809f4 JL |
1707 | && (set = single_set (insn)) != 0 |
1708 | && SET_DEST (set) == var | |
63770d6a RK |
1709 | /* If this represents the result of an insn group, |
1710 | don't delete the insn. */ | |
1711 | && find_reg_note (insn, REG_RETVAL, NULL_RTX) == 0 | |
e5e809f4 JL |
1712 | && (rtx_equal_p (SET_SRC (set), var) |
1713 | || (GET_CODE (SET_SRC (set)) == REG | |
1714 | && (prev = prev_nonnote_insn (insn)) != 0 | |
1715 | && (prev_set = single_set (prev)) != 0 | |
1716 | && SET_DEST (prev_set) == SET_SRC (set) | |
1717 | && rtx_equal_p (SET_SRC (prev_set), var)))) | |
6f086dfc | 1718 | { |
b4ff474c RS |
1719 | /* In unoptimized compilation, we shouldn't call delete_insn |
1720 | except in jump.c doing warnings. */ | |
1721 | PUT_CODE (insn, NOTE); | |
1722 | NOTE_LINE_NUMBER (insn) = NOTE_INSN_DELETED; | |
1723 | NOTE_SOURCE_FILE (insn) = 0; | |
6f086dfc RS |
1724 | if (insn == last_parm_insn) |
1725 | last_parm_insn = PREV_INSN (next); | |
1726 | } | |
1727 | else | |
1728 | { | |
02a10449 RK |
1729 | struct fixup_replacement *replacements = 0; |
1730 | rtx next_insn = NEXT_INSN (insn); | |
1731 | ||
e9a25f70 JL |
1732 | if (SMALL_REGISTER_CLASSES) |
1733 | { | |
1734 | /* If the insn that copies the results of a CALL_INSN | |
1735 | into a pseudo now references VAR, we have to use an | |
1736 | intermediate pseudo since we want the life of the | |
1737 | return value register to be only a single insn. | |
02a10449 | 1738 | |
e9a25f70 JL |
1739 | If we don't use an intermediate pseudo, such things as |
1740 | address computations to make the address of VAR valid | |
1741 | if it is not can be placed between the CALL_INSN and INSN. | |
02a10449 | 1742 | |
e9a25f70 JL |
1743 | To make sure this doesn't happen, we record the destination |
1744 | of the CALL_INSN and see if the next insn uses both that | |
1745 | and VAR. */ | |
02a10449 | 1746 | |
f95182a4 ILT |
1747 | if (call_dest != 0 && GET_CODE (insn) == INSN |
1748 | && reg_mentioned_p (var, PATTERN (insn)) | |
1749 | && reg_mentioned_p (call_dest, PATTERN (insn))) | |
1750 | { | |
1751 | rtx temp = gen_reg_rtx (GET_MODE (call_dest)); | |
02a10449 | 1752 | |
f95182a4 | 1753 | emit_insn_before (gen_move_insn (temp, call_dest), insn); |
02a10449 | 1754 | |
f95182a4 ILT |
1755 | PATTERN (insn) = replace_rtx (PATTERN (insn), |
1756 | call_dest, temp); | |
1757 | } | |
718fe406 | 1758 | |
f95182a4 ILT |
1759 | if (GET_CODE (insn) == CALL_INSN |
1760 | && GET_CODE (PATTERN (insn)) == SET) | |
1761 | call_dest = SET_DEST (PATTERN (insn)); | |
1762 | else if (GET_CODE (insn) == CALL_INSN | |
1763 | && GET_CODE (PATTERN (insn)) == PARALLEL | |
1764 | && GET_CODE (XVECEXP (PATTERN (insn), 0, 0)) == SET) | |
1765 | call_dest = SET_DEST (XVECEXP (PATTERN (insn), 0, 0)); | |
1766 | else | |
1767 | call_dest = 0; | |
1768 | } | |
02a10449 | 1769 | |
6f086dfc RS |
1770 | /* See if we have to do anything to INSN now that VAR is in |
1771 | memory. If it needs to be loaded into a pseudo, use a single | |
1772 | pseudo for the entire insn in case there is a MATCH_DUP | |
1773 | between two operands. We pass a pointer to the head of | |
1774 | a list of struct fixup_replacements. If fixup_var_refs_1 | |
1775 | needs to allocate pseudos or replacement MEMs (for SUBREGs), | |
1776 | it will record them in this list. | |
718fe406 | 1777 | |
6f086dfc RS |
1778 | If it allocated a pseudo for any replacement, we copy into |
1779 | it here. */ | |
1780 | ||
00d8a4c1 RK |
1781 | fixup_var_refs_1 (var, promoted_mode, &PATTERN (insn), insn, |
1782 | &replacements); | |
6f086dfc | 1783 | |
77121fee JW |
1784 | /* If this is last_parm_insn, and any instructions were output |
1785 | after it to fix it up, then we must set last_parm_insn to | |
1786 | the last such instruction emitted. */ | |
1787 | if (insn == last_parm_insn) | |
1788 | last_parm_insn = PREV_INSN (next_insn); | |
1789 | ||
6f086dfc RS |
1790 | while (replacements) |
1791 | { | |
1f8f4a0b MM |
1792 | struct fixup_replacement *next; |
1793 | ||
6f086dfc RS |
1794 | if (GET_CODE (replacements->new) == REG) |
1795 | { | |
1796 | rtx insert_before; | |
00d8a4c1 | 1797 | rtx seq; |
6f086dfc RS |
1798 | |
1799 | /* OLD might be a (subreg (mem)). */ | |
1800 | if (GET_CODE (replacements->old) == SUBREG) | |
1801 | replacements->old | |
1802 | = fixup_memory_subreg (replacements->old, insn, 0); | |
1803 | else | |
1804 | replacements->old | |
1805 | = fixup_stack_1 (replacements->old, insn); | |
1806 | ||
5fa7422b | 1807 | insert_before = insn; |
6f086dfc | 1808 | |
00d8a4c1 RK |
1809 | /* If we are changing the mode, do a conversion. |
1810 | This might be wasteful, but combine.c will | |
1811 | eliminate much of the waste. */ | |
1812 | ||
1813 | if (GET_MODE (replacements->new) | |
1814 | != GET_MODE (replacements->old)) | |
1815 | { | |
1816 | start_sequence (); | |
1817 | convert_move (replacements->new, | |
1818 | replacements->old, unsignedp); | |
1819 | seq = gen_sequence (); | |
1820 | end_sequence (); | |
1821 | } | |
1822 | else | |
1823 | seq = gen_move_insn (replacements->new, | |
1824 | replacements->old); | |
1825 | ||
1826 | emit_insn_before (seq, insert_before); | |
6f086dfc RS |
1827 | } |
1828 | ||
1f8f4a0b MM |
1829 | next = replacements->next; |
1830 | free (replacements); | |
1831 | replacements = next; | |
6f086dfc RS |
1832 | } |
1833 | } | |
1834 | ||
1835 | /* Also fix up any invalid exprs in the REG_NOTES of this insn. | |
1836 | But don't touch other insns referred to by reg-notes; | |
1837 | we will get them elsewhere. */ | |
ef178af3 ZW |
1838 | while (note) |
1839 | { | |
1840 | if (GET_CODE (note) != INSN_LIST) | |
1841 | XEXP (note, 0) | |
1842 | = walk_fixup_memory_subreg (XEXP (note, 0), insn, 1); | |
718fe406 | 1843 | note = XEXP (note, 1); |
ef178af3 | 1844 | } |
6f086dfc | 1845 | } |
fe9b4957 MM |
1846 | |
1847 | if (!ht) | |
1848 | insn = next; | |
1849 | else if (insn_list) | |
1850 | { | |
1851 | insn = XEXP (insn_list, 0); | |
1852 | insn_list = XEXP (insn_list, 1); | |
1853 | } | |
1854 | else | |
1855 | insn = NULL_RTX; | |
6f086dfc RS |
1856 | } |
1857 | } | |
1858 | \f | |
00d8a4c1 | 1859 | /* VAR is a MEM that used to be a pseudo register with mode PROMOTED_MODE. |
718fe406 | 1860 | See if the rtx expression at *LOC in INSN needs to be changed. |
6f086dfc RS |
1861 | |
1862 | REPLACEMENTS is a pointer to a list head that starts out zero, but may | |
1863 | contain a list of original rtx's and replacements. If we find that we need | |
1864 | to modify this insn by replacing a memory reference with a pseudo or by | |
1865 | making a new MEM to implement a SUBREG, we consult that list to see if | |
1866 | we have already chosen a replacement. If none has already been allocated, | |
1867 | we allocate it and update the list. fixup_var_refs_insns will copy VAR | |
1868 | or the SUBREG, as appropriate, to the pseudo. */ | |
1869 | ||
1870 | static void | |
00d8a4c1 | 1871 | fixup_var_refs_1 (var, promoted_mode, loc, insn, replacements) |
6f086dfc | 1872 | register rtx var; |
00d8a4c1 | 1873 | enum machine_mode promoted_mode; |
6f086dfc RS |
1874 | register rtx *loc; |
1875 | rtx insn; | |
1876 | struct fixup_replacement **replacements; | |
1877 | { | |
1878 | register int i; | |
1879 | register rtx x = *loc; | |
1880 | RTX_CODE code = GET_CODE (x); | |
6f7d635c | 1881 | register const char *fmt; |
6f086dfc RS |
1882 | register rtx tem, tem1; |
1883 | struct fixup_replacement *replacement; | |
1884 | ||
1885 | switch (code) | |
1886 | { | |
e9a25f70 JL |
1887 | case ADDRESSOF: |
1888 | if (XEXP (x, 0) == var) | |
1889 | { | |
956d6950 JL |
1890 | /* Prevent sharing of rtl that might lose. */ |
1891 | rtx sub = copy_rtx (XEXP (var, 0)); | |
1892 | ||
956d6950 JL |
1893 | if (! validate_change (insn, loc, sub, 0)) |
1894 | { | |
5f98f7c4 RH |
1895 | rtx y = gen_reg_rtx (GET_MODE (sub)); |
1896 | rtx seq, new_insn; | |
1897 | ||
1898 | /* We should be able to replace with a register or all is lost. | |
1899 | Note that we can't use validate_change to verify this, since | |
1900 | we're not caring for replacing all dups simultaneously. */ | |
1901 | if (! validate_replace_rtx (*loc, y, insn)) | |
1902 | abort (); | |
1903 | ||
1904 | /* Careful! First try to recognize a direct move of the | |
1905 | value, mimicking how things are done in gen_reload wrt | |
1906 | PLUS. Consider what happens when insn is a conditional | |
1907 | move instruction and addsi3 clobbers flags. */ | |
1908 | ||
1909 | start_sequence (); | |
1910 | new_insn = emit_insn (gen_rtx_SET (VOIDmode, y, sub)); | |
1911 | seq = gen_sequence (); | |
1912 | end_sequence (); | |
1913 | ||
1914 | if (recog_memoized (new_insn) < 0) | |
1915 | { | |
1916 | /* That failed. Fall back on force_operand and hope. */ | |
956d6950 | 1917 | |
5f98f7c4 RH |
1918 | start_sequence (); |
1919 | force_operand (sub, y); | |
1920 | seq = gen_sequence (); | |
1921 | end_sequence (); | |
1922 | } | |
956d6950 | 1923 | |
5f98f7c4 RH |
1924 | #ifdef HAVE_cc0 |
1925 | /* Don't separate setter from user. */ | |
1926 | if (PREV_INSN (insn) && sets_cc0_p (PREV_INSN (insn))) | |
1927 | insn = PREV_INSN (insn); | |
1928 | #endif | |
1929 | ||
1930 | emit_insn_before (seq, insn); | |
1931 | } | |
e9a25f70 JL |
1932 | } |
1933 | return; | |
1934 | ||
6f086dfc RS |
1935 | case MEM: |
1936 | if (var == x) | |
1937 | { | |
718fe406 | 1938 | /* If we already have a replacement, use it. Otherwise, |
6f086dfc RS |
1939 | try to fix up this address in case it is invalid. */ |
1940 | ||
2740a678 | 1941 | replacement = find_fixup_replacement (replacements, var); |
6f086dfc RS |
1942 | if (replacement->new) |
1943 | { | |
1944 | *loc = replacement->new; | |
1945 | return; | |
1946 | } | |
1947 | ||
1948 | *loc = replacement->new = x = fixup_stack_1 (x, insn); | |
1949 | ||
00d8a4c1 RK |
1950 | /* Unless we are forcing memory to register or we changed the mode, |
1951 | we can leave things the way they are if the insn is valid. */ | |
718fe406 | 1952 | |
6f086dfc | 1953 | INSN_CODE (insn) = -1; |
00d8a4c1 RK |
1954 | if (! flag_force_mem && GET_MODE (x) == promoted_mode |
1955 | && recog_memoized (insn) >= 0) | |
6f086dfc RS |
1956 | return; |
1957 | ||
00d8a4c1 | 1958 | *loc = replacement->new = gen_reg_rtx (promoted_mode); |
6f086dfc RS |
1959 | return; |
1960 | } | |
1961 | ||
1962 | /* If X contains VAR, we need to unshare it here so that we update | |
1963 | each occurrence separately. But all identical MEMs in one insn | |
1964 | must be replaced with the same rtx because of the possibility of | |
1965 | MATCH_DUPs. */ | |
1966 | ||
1967 | if (reg_mentioned_p (var, x)) | |
1968 | { | |
2740a678 | 1969 | replacement = find_fixup_replacement (replacements, x); |
6f086dfc RS |
1970 | if (replacement->new == 0) |
1971 | replacement->new = copy_most_rtx (x, var); | |
1972 | ||
1973 | *loc = x = replacement->new; | |
3f546a53 | 1974 | code = GET_CODE (x); |
6f086dfc RS |
1975 | } |
1976 | break; | |
1977 | ||
1978 | case REG: | |
1979 | case CC0: | |
1980 | case PC: | |
1981 | case CONST_INT: | |
1982 | case CONST: | |
1983 | case SYMBOL_REF: | |
1984 | case LABEL_REF: | |
1985 | case CONST_DOUBLE: | |
1986 | return; | |
1987 | ||
1988 | case SIGN_EXTRACT: | |
1989 | case ZERO_EXTRACT: | |
1990 | /* Note that in some cases those types of expressions are altered | |
1991 | by optimize_bit_field, and do not survive to get here. */ | |
1992 | if (XEXP (x, 0) == var | |
1993 | || (GET_CODE (XEXP (x, 0)) == SUBREG | |
1994 | && SUBREG_REG (XEXP (x, 0)) == var)) | |
1995 | { | |
1996 | /* Get TEM as a valid MEM in the mode presently in the insn. | |
1997 | ||
1998 | We don't worry about the possibility of MATCH_DUP here; it | |
1999 | is highly unlikely and would be tricky to handle. */ | |
2000 | ||
2001 | tem = XEXP (x, 0); | |
2002 | if (GET_CODE (tem) == SUBREG) | |
0e09cc26 RK |
2003 | { |
2004 | if (GET_MODE_BITSIZE (GET_MODE (tem)) | |
2005 | > GET_MODE_BITSIZE (GET_MODE (var))) | |
2006 | { | |
2007 | replacement = find_fixup_replacement (replacements, var); | |
2008 | if (replacement->new == 0) | |
2009 | replacement->new = gen_reg_rtx (GET_MODE (var)); | |
2010 | SUBREG_REG (tem) = replacement->new; | |
226ed43f JW |
2011 | |
2012 | /* The following code works only if we have a MEM, so we | |
2013 | need to handle the subreg here. We directly substitute | |
2014 | it assuming that a subreg must be OK here. We already | |
2015 | scheduled a replacement to copy the mem into the | |
2016 | subreg. */ | |
2017 | XEXP (x, 0) = tem; | |
2018 | return; | |
0e09cc26 | 2019 | } |
ef933d26 RK |
2020 | else |
2021 | tem = fixup_memory_subreg (tem, insn, 0); | |
0e09cc26 RK |
2022 | } |
2023 | else | |
2024 | tem = fixup_stack_1 (tem, insn); | |
6f086dfc RS |
2025 | |
2026 | /* Unless we want to load from memory, get TEM into the proper mode | |
2027 | for an extract from memory. This can only be done if the | |
2028 | extract is at a constant position and length. */ | |
2029 | ||
2030 | if (! flag_force_mem && GET_CODE (XEXP (x, 1)) == CONST_INT | |
2031 | && GET_CODE (XEXP (x, 2)) == CONST_INT | |
2032 | && ! mode_dependent_address_p (XEXP (tem, 0)) | |
2033 | && ! MEM_VOLATILE_P (tem)) | |
2034 | { | |
2035 | enum machine_mode wanted_mode = VOIDmode; | |
2036 | enum machine_mode is_mode = GET_MODE (tem); | |
e5e809f4 | 2037 | HOST_WIDE_INT pos = INTVAL (XEXP (x, 2)); |
6f086dfc RS |
2038 | |
2039 | #ifdef HAVE_extzv | |
2040 | if (GET_CODE (x) == ZERO_EXTRACT) | |
0d8e55d8 | 2041 | { |
a995e389 RH |
2042 | wanted_mode |
2043 | = insn_data[(int) CODE_FOR_extzv].operand[1].mode; | |
0d8e55d8 JL |
2044 | if (wanted_mode == VOIDmode) |
2045 | wanted_mode = word_mode; | |
2046 | } | |
6f086dfc RS |
2047 | #endif |
2048 | #ifdef HAVE_extv | |
2049 | if (GET_CODE (x) == SIGN_EXTRACT) | |
0d8e55d8 | 2050 | { |
a995e389 | 2051 | wanted_mode = insn_data[(int) CODE_FOR_extv].operand[1].mode; |
0d8e55d8 JL |
2052 | if (wanted_mode == VOIDmode) |
2053 | wanted_mode = word_mode; | |
2054 | } | |
6f086dfc | 2055 | #endif |
6dc42e49 | 2056 | /* If we have a narrower mode, we can do something. */ |
6f086dfc RS |
2057 | if (wanted_mode != VOIDmode |
2058 | && GET_MODE_SIZE (wanted_mode) < GET_MODE_SIZE (is_mode)) | |
2059 | { | |
e5e809f4 | 2060 | HOST_WIDE_INT offset = pos / BITS_PER_UNIT; |
6f086dfc RS |
2061 | rtx old_pos = XEXP (x, 2); |
2062 | rtx newmem; | |
2063 | ||
2064 | /* If the bytes and bits are counted differently, we | |
2065 | must adjust the offset. */ | |
f76b9db2 ILT |
2066 | if (BYTES_BIG_ENDIAN != BITS_BIG_ENDIAN) |
2067 | offset = (GET_MODE_SIZE (is_mode) | |
2068 | - GET_MODE_SIZE (wanted_mode) - offset); | |
6f086dfc RS |
2069 | |
2070 | pos %= GET_MODE_BITSIZE (wanted_mode); | |
2071 | ||
38a448ca RH |
2072 | newmem = gen_rtx_MEM (wanted_mode, |
2073 | plus_constant (XEXP (tem, 0), offset)); | |
c6df88cb | 2074 | MEM_COPY_ATTRIBUTES (newmem, tem); |
6f086dfc RS |
2075 | |
2076 | /* Make the change and see if the insn remains valid. */ | |
2077 | INSN_CODE (insn) = -1; | |
2078 | XEXP (x, 0) = newmem; | |
5f4f0e22 | 2079 | XEXP (x, 2) = GEN_INT (pos); |
6f086dfc RS |
2080 | |
2081 | if (recog_memoized (insn) >= 0) | |
2082 | return; | |
2083 | ||
2084 | /* Otherwise, restore old position. XEXP (x, 0) will be | |
2085 | restored later. */ | |
2086 | XEXP (x, 2) = old_pos; | |
2087 | } | |
2088 | } | |
2089 | ||
2090 | /* If we get here, the bitfield extract insn can't accept a memory | |
2091 | reference. Copy the input into a register. */ | |
2092 | ||
2093 | tem1 = gen_reg_rtx (GET_MODE (tem)); | |
2094 | emit_insn_before (gen_move_insn (tem1, tem), insn); | |
2095 | XEXP (x, 0) = tem1; | |
2096 | return; | |
2097 | } | |
2098 | break; | |
718fe406 | 2099 | |
6f086dfc RS |
2100 | case SUBREG: |
2101 | if (SUBREG_REG (x) == var) | |
2102 | { | |
00d8a4c1 RK |
2103 | /* If this is a special SUBREG made because VAR was promoted |
2104 | from a wider mode, replace it with VAR and call ourself | |
2105 | recursively, this time saying that the object previously | |
2106 | had its current mode (by virtue of the SUBREG). */ | |
2107 | ||
2108 | if (SUBREG_PROMOTED_VAR_P (x)) | |
2109 | { | |
2110 | *loc = var; | |
2111 | fixup_var_refs_1 (var, GET_MODE (var), loc, insn, replacements); | |
2112 | return; | |
2113 | } | |
2114 | ||
6f086dfc | 2115 | /* If this SUBREG makes VAR wider, it has become a paradoxical |
718fe406 | 2116 | SUBREG with VAR in memory, but these aren't allowed at this |
6f086dfc RS |
2117 | stage of the compilation. So load VAR into a pseudo and take |
2118 | a SUBREG of that pseudo. */ | |
2119 | if (GET_MODE_SIZE (GET_MODE (x)) > GET_MODE_SIZE (GET_MODE (var))) | |
2120 | { | |
2740a678 | 2121 | replacement = find_fixup_replacement (replacements, var); |
6f086dfc RS |
2122 | if (replacement->new == 0) |
2123 | replacement->new = gen_reg_rtx (GET_MODE (var)); | |
2124 | SUBREG_REG (x) = replacement->new; | |
2125 | return; | |
2126 | } | |
2127 | ||
2128 | /* See if we have already found a replacement for this SUBREG. | |
2129 | If so, use it. Otherwise, make a MEM and see if the insn | |
2130 | is recognized. If not, or if we should force MEM into a register, | |
2131 | make a pseudo for this SUBREG. */ | |
2740a678 | 2132 | replacement = find_fixup_replacement (replacements, x); |
6f086dfc RS |
2133 | if (replacement->new) |
2134 | { | |
2135 | *loc = replacement->new; | |
2136 | return; | |
2137 | } | |
718fe406 | 2138 | |
6f086dfc RS |
2139 | replacement->new = *loc = fixup_memory_subreg (x, insn, 0); |
2140 | ||
f898f031 | 2141 | INSN_CODE (insn) = -1; |
6f086dfc RS |
2142 | if (! flag_force_mem && recog_memoized (insn) >= 0) |
2143 | return; | |
2144 | ||
2145 | *loc = replacement->new = gen_reg_rtx (GET_MODE (x)); | |
2146 | return; | |
2147 | } | |
2148 | break; | |
2149 | ||
2150 | case SET: | |
2151 | /* First do special simplification of bit-field references. */ | |
2152 | if (GET_CODE (SET_DEST (x)) == SIGN_EXTRACT | |
2153 | || GET_CODE (SET_DEST (x)) == ZERO_EXTRACT) | |
2154 | optimize_bit_field (x, insn, 0); | |
2155 | if (GET_CODE (SET_SRC (x)) == SIGN_EXTRACT | |
2156 | || GET_CODE (SET_SRC (x)) == ZERO_EXTRACT) | |
5f4f0e22 | 2157 | optimize_bit_field (x, insn, NULL_PTR); |
6f086dfc | 2158 | |
0e09cc26 RK |
2159 | /* For a paradoxical SUBREG inside a ZERO_EXTRACT, load the object |
2160 | into a register and then store it back out. */ | |
2161 | if (GET_CODE (SET_DEST (x)) == ZERO_EXTRACT | |
2162 | && GET_CODE (XEXP (SET_DEST (x), 0)) == SUBREG | |
2163 | && SUBREG_REG (XEXP (SET_DEST (x), 0)) == var | |
2164 | && (GET_MODE_SIZE (GET_MODE (XEXP (SET_DEST (x), 0))) | |
2165 | > GET_MODE_SIZE (GET_MODE (var)))) | |
2166 | { | |
2167 | replacement = find_fixup_replacement (replacements, var); | |
2168 | if (replacement->new == 0) | |
2169 | replacement->new = gen_reg_rtx (GET_MODE (var)); | |
2170 | ||
2171 | SUBREG_REG (XEXP (SET_DEST (x), 0)) = replacement->new; | |
2172 | emit_insn_after (gen_move_insn (var, replacement->new), insn); | |
2173 | } | |
2174 | ||
6f086dfc | 2175 | /* If SET_DEST is now a paradoxical SUBREG, put the result of this |
0f41302f | 2176 | insn into a pseudo and store the low part of the pseudo into VAR. */ |
6f086dfc RS |
2177 | if (GET_CODE (SET_DEST (x)) == SUBREG |
2178 | && SUBREG_REG (SET_DEST (x)) == var | |
2179 | && (GET_MODE_SIZE (GET_MODE (SET_DEST (x))) | |
2180 | > GET_MODE_SIZE (GET_MODE (var)))) | |
2181 | { | |
2182 | SET_DEST (x) = tem = gen_reg_rtx (GET_MODE (SET_DEST (x))); | |
2183 | emit_insn_after (gen_move_insn (var, gen_lowpart (GET_MODE (var), | |
2184 | tem)), | |
2185 | insn); | |
2186 | break; | |
2187 | } | |
718fe406 | 2188 | |
6f086dfc RS |
2189 | { |
2190 | rtx dest = SET_DEST (x); | |
2191 | rtx src = SET_SRC (x); | |
29a82058 | 2192 | #ifdef HAVE_insv |
6f086dfc | 2193 | rtx outerdest = dest; |
29a82058 | 2194 | #endif |
6f086dfc RS |
2195 | |
2196 | while (GET_CODE (dest) == SUBREG || GET_CODE (dest) == STRICT_LOW_PART | |
2197 | || GET_CODE (dest) == SIGN_EXTRACT | |
2198 | || GET_CODE (dest) == ZERO_EXTRACT) | |
2199 | dest = XEXP (dest, 0); | |
2200 | ||
2201 | if (GET_CODE (src) == SUBREG) | |
2202 | src = XEXP (src, 0); | |
2203 | ||
2204 | /* If VAR does not appear at the top level of the SET | |
2205 | just scan the lower levels of the tree. */ | |
2206 | ||
718fe406 | 2207 | if (src != var && dest != var) |
6f086dfc RS |
2208 | break; |
2209 | ||
2210 | /* We will need to rerecognize this insn. */ | |
2211 | INSN_CODE (insn) = -1; | |
2212 | ||
2213 | #ifdef HAVE_insv | |
2214 | if (GET_CODE (outerdest) == ZERO_EXTRACT && dest == var) | |
2215 | { | |
2216 | /* Since this case will return, ensure we fixup all the | |
2217 | operands here. */ | |
00d8a4c1 RK |
2218 | fixup_var_refs_1 (var, promoted_mode, &XEXP (outerdest, 1), |
2219 | insn, replacements); | |
2220 | fixup_var_refs_1 (var, promoted_mode, &XEXP (outerdest, 2), | |
2221 | insn, replacements); | |
2222 | fixup_var_refs_1 (var, promoted_mode, &SET_SRC (x), | |
2223 | insn, replacements); | |
6f086dfc RS |
2224 | |
2225 | tem = XEXP (outerdest, 0); | |
2226 | ||
2227 | /* Clean up (SUBREG:SI (MEM:mode ...) 0) | |
2228 | that may appear inside a ZERO_EXTRACT. | |
2229 | This was legitimate when the MEM was a REG. */ | |
2230 | if (GET_CODE (tem) == SUBREG | |
2231 | && SUBREG_REG (tem) == var) | |
0e09cc26 | 2232 | tem = fixup_memory_subreg (tem, insn, 0); |
6f086dfc RS |
2233 | else |
2234 | tem = fixup_stack_1 (tem, insn); | |
2235 | ||
2236 | if (GET_CODE (XEXP (outerdest, 1)) == CONST_INT | |
2237 | && GET_CODE (XEXP (outerdest, 2)) == CONST_INT | |
2238 | && ! mode_dependent_address_p (XEXP (tem, 0)) | |
2239 | && ! MEM_VOLATILE_P (tem)) | |
2240 | { | |
0d8e55d8 | 2241 | enum machine_mode wanted_mode; |
6f086dfc | 2242 | enum machine_mode is_mode = GET_MODE (tem); |
e5e809f4 | 2243 | HOST_WIDE_INT pos = INTVAL (XEXP (outerdest, 2)); |
6f086dfc | 2244 | |
a995e389 | 2245 | wanted_mode = insn_data[(int) CODE_FOR_insv].operand[0].mode; |
0d8e55d8 JL |
2246 | if (wanted_mode == VOIDmode) |
2247 | wanted_mode = word_mode; | |
2248 | ||
6dc42e49 | 2249 | /* If we have a narrower mode, we can do something. */ |
6f086dfc RS |
2250 | if (GET_MODE_SIZE (wanted_mode) < GET_MODE_SIZE (is_mode)) |
2251 | { | |
e5e809f4 | 2252 | HOST_WIDE_INT offset = pos / BITS_PER_UNIT; |
6f086dfc RS |
2253 | rtx old_pos = XEXP (outerdest, 2); |
2254 | rtx newmem; | |
2255 | ||
f76b9db2 ILT |
2256 | if (BYTES_BIG_ENDIAN != BITS_BIG_ENDIAN) |
2257 | offset = (GET_MODE_SIZE (is_mode) | |
2258 | - GET_MODE_SIZE (wanted_mode) - offset); | |
6f086dfc RS |
2259 | |
2260 | pos %= GET_MODE_BITSIZE (wanted_mode); | |
2261 | ||
38a448ca | 2262 | newmem = gen_rtx_MEM (wanted_mode, |
c5c76735 JL |
2263 | plus_constant (XEXP (tem, 0), |
2264 | offset)); | |
c6df88cb | 2265 | MEM_COPY_ATTRIBUTES (newmem, tem); |
6f086dfc RS |
2266 | |
2267 | /* Make the change and see if the insn remains valid. */ | |
2268 | INSN_CODE (insn) = -1; | |
2269 | XEXP (outerdest, 0) = newmem; | |
5f4f0e22 | 2270 | XEXP (outerdest, 2) = GEN_INT (pos); |
718fe406 | 2271 | |
6f086dfc RS |
2272 | if (recog_memoized (insn) >= 0) |
2273 | return; | |
718fe406 | 2274 | |
6f086dfc RS |
2275 | /* Otherwise, restore old position. XEXP (x, 0) will be |
2276 | restored later. */ | |
2277 | XEXP (outerdest, 2) = old_pos; | |
2278 | } | |
2279 | } | |
2280 | ||
2281 | /* If we get here, the bit-field store doesn't allow memory | |
2282 | or isn't located at a constant position. Load the value into | |
2283 | a register, do the store, and put it back into memory. */ | |
2284 | ||
2285 | tem1 = gen_reg_rtx (GET_MODE (tem)); | |
2286 | emit_insn_before (gen_move_insn (tem1, tem), insn); | |
2287 | emit_insn_after (gen_move_insn (tem, tem1), insn); | |
2288 | XEXP (outerdest, 0) = tem1; | |
2289 | return; | |
2290 | } | |
2291 | #endif | |
2292 | ||
2293 | /* STRICT_LOW_PART is a no-op on memory references | |
2294 | and it can cause combinations to be unrecognizable, | |
2295 | so eliminate it. */ | |
2296 | ||
2297 | if (dest == var && GET_CODE (SET_DEST (x)) == STRICT_LOW_PART) | |
2298 | SET_DEST (x) = XEXP (SET_DEST (x), 0); | |
2299 | ||
2300 | /* A valid insn to copy VAR into or out of a register | |
2301 | must be left alone, to avoid an infinite loop here. | |
2302 | If the reference to VAR is by a subreg, fix that up, | |
2303 | since SUBREG is not valid for a memref. | |
e15762df RK |
2304 | Also fix up the address of the stack slot. |
2305 | ||
2306 | Note that we must not try to recognize the insn until | |
2307 | after we know that we have valid addresses and no | |
2308 | (subreg (mem ...) ...) constructs, since these interfere | |
2309 | with determining the validity of the insn. */ | |
6f086dfc RS |
2310 | |
2311 | if ((SET_SRC (x) == var | |
2312 | || (GET_CODE (SET_SRC (x)) == SUBREG | |
2313 | && SUBREG_REG (SET_SRC (x)) == var)) | |
2314 | && (GET_CODE (SET_DEST (x)) == REG | |
2315 | || (GET_CODE (SET_DEST (x)) == SUBREG | |
2316 | && GET_CODE (SUBREG_REG (SET_DEST (x))) == REG)) | |
1d273bf5 | 2317 | && GET_MODE (var) == promoted_mode |
c46722a7 | 2318 | && x == single_set (insn)) |
6f086dfc | 2319 | { |
cc0cbae1 | 2320 | rtx pat, last; |
e15762df | 2321 | |
2740a678 | 2322 | replacement = find_fixup_replacement (replacements, SET_SRC (x)); |
6f086dfc | 2323 | if (replacement->new) |
6f086dfc | 2324 | SET_SRC (x) = replacement->new; |
6f086dfc RS |
2325 | else if (GET_CODE (SET_SRC (x)) == SUBREG) |
2326 | SET_SRC (x) = replacement->new | |
2327 | = fixup_memory_subreg (SET_SRC (x), insn, 0); | |
2328 | else | |
2329 | SET_SRC (x) = replacement->new | |
2330 | = fixup_stack_1 (SET_SRC (x), insn); | |
e15762df RK |
2331 | |
2332 | if (recog_memoized (insn) >= 0) | |
2333 | return; | |
2334 | ||
2335 | /* INSN is not valid, but we know that we want to | |
2336 | copy SET_SRC (x) to SET_DEST (x) in some way. So | |
2337 | we generate the move and see whether it requires more | |
2338 | than one insn. If it does, we emit those insns and | |
718fe406 | 2339 | delete INSN. Otherwise, we an just replace the pattern |
e15762df RK |
2340 | of INSN; we have already verified above that INSN has |
2341 | no other function that to do X. */ | |
2342 | ||
2343 | pat = gen_move_insn (SET_DEST (x), SET_SRC (x)); | |
2344 | if (GET_CODE (pat) == SEQUENCE) | |
2345 | { | |
cc0cbae1 JW |
2346 | last = emit_insn_before (pat, insn); |
2347 | ||
2348 | /* INSN might have REG_RETVAL or other important notes, so | |
2349 | we need to store the pattern of the last insn in the | |
2350 | sequence into INSN similarly to the normal case. LAST | |
2351 | should not have REG_NOTES, but we allow them if INSN has | |
2352 | no REG_NOTES. */ | |
2353 | if (REG_NOTES (last) && REG_NOTES (insn)) | |
2354 | abort (); | |
2355 | if (REG_NOTES (last)) | |
2356 | REG_NOTES (insn) = REG_NOTES (last); | |
2357 | PATTERN (insn) = PATTERN (last); | |
2358 | ||
2359 | PUT_CODE (last, NOTE); | |
2360 | NOTE_LINE_NUMBER (last) = NOTE_INSN_DELETED; | |
2361 | NOTE_SOURCE_FILE (last) = 0; | |
e15762df RK |
2362 | } |
2363 | else | |
2364 | PATTERN (insn) = pat; | |
2365 | ||
6f086dfc RS |
2366 | return; |
2367 | } | |
2368 | ||
2369 | if ((SET_DEST (x) == var | |
2370 | || (GET_CODE (SET_DEST (x)) == SUBREG | |
2371 | && SUBREG_REG (SET_DEST (x)) == var)) | |
2372 | && (GET_CODE (SET_SRC (x)) == REG | |
2373 | || (GET_CODE (SET_SRC (x)) == SUBREG | |
2374 | && GET_CODE (SUBREG_REG (SET_SRC (x))) == REG)) | |
1d273bf5 | 2375 | && GET_MODE (var) == promoted_mode |
c46722a7 | 2376 | && x == single_set (insn)) |
6f086dfc | 2377 | { |
cc0cbae1 | 2378 | rtx pat, last; |
e15762df | 2379 | |
6f086dfc RS |
2380 | if (GET_CODE (SET_DEST (x)) == SUBREG) |
2381 | SET_DEST (x) = fixup_memory_subreg (SET_DEST (x), insn, 0); | |
2382 | else | |
2383 | SET_DEST (x) = fixup_stack_1 (SET_DEST (x), insn); | |
e15762df RK |
2384 | |
2385 | if (recog_memoized (insn) >= 0) | |
2386 | return; | |
2387 | ||
2388 | pat = gen_move_insn (SET_DEST (x), SET_SRC (x)); | |
2389 | if (GET_CODE (pat) == SEQUENCE) | |
2390 | { | |
cc0cbae1 JW |
2391 | last = emit_insn_before (pat, insn); |
2392 | ||
2393 | /* INSN might have REG_RETVAL or other important notes, so | |
2394 | we need to store the pattern of the last insn in the | |
2395 | sequence into INSN similarly to the normal case. LAST | |
2396 | should not have REG_NOTES, but we allow them if INSN has | |
2397 | no REG_NOTES. */ | |
2398 | if (REG_NOTES (last) && REG_NOTES (insn)) | |
2399 | abort (); | |
2400 | if (REG_NOTES (last)) | |
2401 | REG_NOTES (insn) = REG_NOTES (last); | |
2402 | PATTERN (insn) = PATTERN (last); | |
2403 | ||
2404 | PUT_CODE (last, NOTE); | |
2405 | NOTE_LINE_NUMBER (last) = NOTE_INSN_DELETED; | |
2406 | NOTE_SOURCE_FILE (last) = 0; | |
e15762df RK |
2407 | } |
2408 | else | |
2409 | PATTERN (insn) = pat; | |
2410 | ||
6f086dfc RS |
2411 | return; |
2412 | } | |
2413 | ||
2414 | /* Otherwise, storing into VAR must be handled specially | |
2415 | by storing into a temporary and copying that into VAR | |
00d8a4c1 RK |
2416 | with a new insn after this one. Note that this case |
2417 | will be used when storing into a promoted scalar since | |
2418 | the insn will now have different modes on the input | |
2419 | and output and hence will be invalid (except for the case | |
2420 | of setting it to a constant, which does not need any | |
2421 | change if it is valid). We generate extra code in that case, | |
2422 | but combine.c will eliminate it. */ | |
6f086dfc RS |
2423 | |
2424 | if (dest == var) | |
2425 | { | |
2426 | rtx temp; | |
00d8a4c1 RK |
2427 | rtx fixeddest = SET_DEST (x); |
2428 | ||
6f086dfc | 2429 | /* STRICT_LOW_PART can be discarded, around a MEM. */ |
00d8a4c1 RK |
2430 | if (GET_CODE (fixeddest) == STRICT_LOW_PART) |
2431 | fixeddest = XEXP (fixeddest, 0); | |
6f086dfc | 2432 | /* Convert (SUBREG (MEM)) to a MEM in a changed mode. */ |
00d8a4c1 | 2433 | if (GET_CODE (fixeddest) == SUBREG) |
926d1ca5 RK |
2434 | { |
2435 | fixeddest = fixup_memory_subreg (fixeddest, insn, 0); | |
2436 | promoted_mode = GET_MODE (fixeddest); | |
2437 | } | |
6f086dfc | 2438 | else |
00d8a4c1 RK |
2439 | fixeddest = fixup_stack_1 (fixeddest, insn); |
2440 | ||
926d1ca5 | 2441 | temp = gen_reg_rtx (promoted_mode); |
00d8a4c1 RK |
2442 | |
2443 | emit_insn_after (gen_move_insn (fixeddest, | |
2444 | gen_lowpart (GET_MODE (fixeddest), | |
2445 | temp)), | |
2446 | insn); | |
6f086dfc | 2447 | |
6f086dfc RS |
2448 | SET_DEST (x) = temp; |
2449 | } | |
2450 | } | |
e9a25f70 JL |
2451 | |
2452 | default: | |
2453 | break; | |
6f086dfc RS |
2454 | } |
2455 | ||
2456 | /* Nothing special about this RTX; fix its operands. */ | |
2457 | ||
2458 | fmt = GET_RTX_FORMAT (code); | |
2459 | for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--) | |
2460 | { | |
2461 | if (fmt[i] == 'e') | |
00d8a4c1 | 2462 | fixup_var_refs_1 (var, promoted_mode, &XEXP (x, i), insn, replacements); |
d4757e6a | 2463 | else if (fmt[i] == 'E') |
6f086dfc RS |
2464 | { |
2465 | register int j; | |
2466 | for (j = 0; j < XVECLEN (x, i); j++) | |
00d8a4c1 RK |
2467 | fixup_var_refs_1 (var, promoted_mode, &XVECEXP (x, i, j), |
2468 | insn, replacements); | |
6f086dfc RS |
2469 | } |
2470 | } | |
2471 | } | |
2472 | \f | |
2473 | /* Given X, an rtx of the form (SUBREG:m1 (MEM:m2 addr)), | |
2474 | return an rtx (MEM:m1 newaddr) which is equivalent. | |
2475 | If any insns must be emitted to compute NEWADDR, put them before INSN. | |
2476 | ||
2477 | UNCRITICAL nonzero means accept paradoxical subregs. | |
0f41302f | 2478 | This is used for subregs found inside REG_NOTES. */ |
6f086dfc RS |
2479 | |
2480 | static rtx | |
2481 | fixup_memory_subreg (x, insn, uncritical) | |
2482 | rtx x; | |
2483 | rtx insn; | |
2484 | int uncritical; | |
2485 | { | |
2486 | int offset = SUBREG_WORD (x) * UNITS_PER_WORD; | |
2487 | rtx addr = XEXP (SUBREG_REG (x), 0); | |
2488 | enum machine_mode mode = GET_MODE (x); | |
29a82058 | 2489 | rtx result; |
6f086dfc RS |
2490 | |
2491 | /* Paradoxical SUBREGs are usually invalid during RTL generation. */ | |
2492 | if (GET_MODE_SIZE (mode) > GET_MODE_SIZE (GET_MODE (SUBREG_REG (x))) | |
2493 | && ! uncritical) | |
2494 | abort (); | |
2495 | ||
f76b9db2 ILT |
2496 | if (BYTES_BIG_ENDIAN) |
2497 | offset += (MIN (UNITS_PER_WORD, GET_MODE_SIZE (GET_MODE (SUBREG_REG (x)))) | |
2498 | - MIN (UNITS_PER_WORD, GET_MODE_SIZE (mode))); | |
6f086dfc RS |
2499 | addr = plus_constant (addr, offset); |
2500 | if (!flag_force_addr && memory_address_p (mode, addr)) | |
2501 | /* Shortcut if no insns need be emitted. */ | |
2502 | return change_address (SUBREG_REG (x), mode, addr); | |
2503 | start_sequence (); | |
2504 | result = change_address (SUBREG_REG (x), mode, addr); | |
2505 | emit_insn_before (gen_sequence (), insn); | |
2506 | end_sequence (); | |
2507 | return result; | |
2508 | } | |
2509 | ||
2510 | /* Do fixup_memory_subreg on all (SUBREG (MEM ...) ...) contained in X. | |
2511 | Replace subexpressions of X in place. | |
2512 | If X itself is a (SUBREG (MEM ...) ...), return the replacement expression. | |
2513 | Otherwise return X, with its contents possibly altered. | |
2514 | ||
718fe406 | 2515 | If any insns must be emitted to compute NEWADDR, put them before INSN. |
ab6155b7 RK |
2516 | |
2517 | UNCRITICAL is as in fixup_memory_subreg. */ | |
6f086dfc RS |
2518 | |
2519 | static rtx | |
ab6155b7 | 2520 | walk_fixup_memory_subreg (x, insn, uncritical) |
6f086dfc RS |
2521 | register rtx x; |
2522 | rtx insn; | |
ab6155b7 | 2523 | int uncritical; |
6f086dfc RS |
2524 | { |
2525 | register enum rtx_code code; | |
6f7d635c | 2526 | register const char *fmt; |
6f086dfc RS |
2527 | register int i; |
2528 | ||
2529 | if (x == 0) | |
2530 | return 0; | |
2531 | ||
2532 | code = GET_CODE (x); | |
2533 | ||
2534 | if (code == SUBREG && GET_CODE (SUBREG_REG (x)) == MEM) | |
ab6155b7 | 2535 | return fixup_memory_subreg (x, insn, uncritical); |
6f086dfc RS |
2536 | |
2537 | /* Nothing special about this RTX; fix its operands. */ | |
2538 | ||
2539 | fmt = GET_RTX_FORMAT (code); | |
2540 | for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--) | |
2541 | { | |
2542 | if (fmt[i] == 'e') | |
ab6155b7 | 2543 | XEXP (x, i) = walk_fixup_memory_subreg (XEXP (x, i), insn, uncritical); |
d4757e6a | 2544 | else if (fmt[i] == 'E') |
6f086dfc RS |
2545 | { |
2546 | register int j; | |
2547 | for (j = 0; j < XVECLEN (x, i); j++) | |
2548 | XVECEXP (x, i, j) | |
ab6155b7 | 2549 | = walk_fixup_memory_subreg (XVECEXP (x, i, j), insn, uncritical); |
6f086dfc RS |
2550 | } |
2551 | } | |
2552 | return x; | |
2553 | } | |
2554 | \f | |
6f086dfc RS |
2555 | /* For each memory ref within X, if it refers to a stack slot |
2556 | with an out of range displacement, put the address in a temp register | |
2557 | (emitting new insns before INSN to load these registers) | |
2558 | and alter the memory ref to use that register. | |
2559 | Replace each such MEM rtx with a copy, to avoid clobberage. */ | |
2560 | ||
2561 | static rtx | |
2562 | fixup_stack_1 (x, insn) | |
2563 | rtx x; | |
2564 | rtx insn; | |
2565 | { | |
2566 | register int i; | |
2567 | register RTX_CODE code = GET_CODE (x); | |
6f7d635c | 2568 | register const char *fmt; |
6f086dfc RS |
2569 | |
2570 | if (code == MEM) | |
2571 | { | |
2572 | register rtx ad = XEXP (x, 0); | |
2573 | /* If we have address of a stack slot but it's not valid | |
2574 | (displacement is too large), compute the sum in a register. */ | |
2575 | if (GET_CODE (ad) == PLUS | |
2576 | && GET_CODE (XEXP (ad, 0)) == REG | |
40d05551 RK |
2577 | && ((REGNO (XEXP (ad, 0)) >= FIRST_VIRTUAL_REGISTER |
2578 | && REGNO (XEXP (ad, 0)) <= LAST_VIRTUAL_REGISTER) | |
e9a25f70 JL |
2579 | || REGNO (XEXP (ad, 0)) == FRAME_POINTER_REGNUM |
2580 | #if HARD_FRAME_POINTER_REGNUM != FRAME_POINTER_REGNUM | |
2581 | || REGNO (XEXP (ad, 0)) == HARD_FRAME_POINTER_REGNUM | |
2582 | #endif | |
2583 | || REGNO (XEXP (ad, 0)) == STACK_POINTER_REGNUM | |
956d6950 | 2584 | || REGNO (XEXP (ad, 0)) == ARG_POINTER_REGNUM |
40d05551 | 2585 | || XEXP (ad, 0) == current_function_internal_arg_pointer) |
6f086dfc RS |
2586 | && GET_CODE (XEXP (ad, 1)) == CONST_INT) |
2587 | { | |
2588 | rtx temp, seq; | |
2589 | if (memory_address_p (GET_MODE (x), ad)) | |
2590 | return x; | |
2591 | ||
2592 | start_sequence (); | |
2593 | temp = copy_to_reg (ad); | |
2594 | seq = gen_sequence (); | |
2595 | end_sequence (); | |
2596 | emit_insn_before (seq, insn); | |
2597 | return change_address (x, VOIDmode, temp); | |
2598 | } | |
2599 | return x; | |
2600 | } | |
2601 | ||
2602 | fmt = GET_RTX_FORMAT (code); | |
2603 | for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--) | |
2604 | { | |
2605 | if (fmt[i] == 'e') | |
2606 | XEXP (x, i) = fixup_stack_1 (XEXP (x, i), insn); | |
d4757e6a | 2607 | else if (fmt[i] == 'E') |
6f086dfc RS |
2608 | { |
2609 | register int j; | |
2610 | for (j = 0; j < XVECLEN (x, i); j++) | |
2611 | XVECEXP (x, i, j) = fixup_stack_1 (XVECEXP (x, i, j), insn); | |
2612 | } | |
2613 | } | |
2614 | return x; | |
2615 | } | |
2616 | \f | |
2617 | /* Optimization: a bit-field instruction whose field | |
2618 | happens to be a byte or halfword in memory | |
2619 | can be changed to a move instruction. | |
2620 | ||
2621 | We call here when INSN is an insn to examine or store into a bit-field. | |
2622 | BODY is the SET-rtx to be altered. | |
2623 | ||
2624 | EQUIV_MEM is the table `reg_equiv_mem' if that is available; else 0. | |
2625 | (Currently this is called only from function.c, and EQUIV_MEM | |
2626 | is always 0.) */ | |
2627 | ||
2628 | static void | |
2629 | optimize_bit_field (body, insn, equiv_mem) | |
2630 | rtx body; | |
2631 | rtx insn; | |
2632 | rtx *equiv_mem; | |
2633 | { | |
2634 | register rtx bitfield; | |
2635 | int destflag; | |
2636 | rtx seq = 0; | |
2637 | enum machine_mode mode; | |
2638 | ||
2639 | if (GET_CODE (SET_DEST (body)) == SIGN_EXTRACT | |
2640 | || GET_CODE (SET_DEST (body)) == ZERO_EXTRACT) | |
2641 | bitfield = SET_DEST (body), destflag = 1; | |
2642 | else | |
2643 | bitfield = SET_SRC (body), destflag = 0; | |
2644 | ||
2645 | /* First check that the field being stored has constant size and position | |
2646 | and is in fact a byte or halfword suitably aligned. */ | |
2647 | ||
2648 | if (GET_CODE (XEXP (bitfield, 1)) == CONST_INT | |
2649 | && GET_CODE (XEXP (bitfield, 2)) == CONST_INT | |
2650 | && ((mode = mode_for_size (INTVAL (XEXP (bitfield, 1)), MODE_INT, 1)) | |
2651 | != BLKmode) | |
2652 | && INTVAL (XEXP (bitfield, 2)) % INTVAL (XEXP (bitfield, 1)) == 0) | |
2653 | { | |
2654 | register rtx memref = 0; | |
2655 | ||
2656 | /* Now check that the containing word is memory, not a register, | |
2657 | and that it is safe to change the machine mode. */ | |
2658 | ||
2659 | if (GET_CODE (XEXP (bitfield, 0)) == MEM) | |
2660 | memref = XEXP (bitfield, 0); | |
2661 | else if (GET_CODE (XEXP (bitfield, 0)) == REG | |
2662 | && equiv_mem != 0) | |
2663 | memref = equiv_mem[REGNO (XEXP (bitfield, 0))]; | |
2664 | else if (GET_CODE (XEXP (bitfield, 0)) == SUBREG | |
2665 | && GET_CODE (SUBREG_REG (XEXP (bitfield, 0))) == MEM) | |
2666 | memref = SUBREG_REG (XEXP (bitfield, 0)); | |
2667 | else if (GET_CODE (XEXP (bitfield, 0)) == SUBREG | |
2668 | && equiv_mem != 0 | |
2669 | && GET_CODE (SUBREG_REG (XEXP (bitfield, 0))) == REG) | |
2670 | memref = equiv_mem[REGNO (SUBREG_REG (XEXP (bitfield, 0)))]; | |
2671 | ||
2672 | if (memref | |
2673 | && ! mode_dependent_address_p (XEXP (memref, 0)) | |
2674 | && ! MEM_VOLATILE_P (memref)) | |
2675 | { | |
2676 | /* Now adjust the address, first for any subreg'ing | |
2677 | that we are now getting rid of, | |
2678 | and then for which byte of the word is wanted. */ | |
2679 | ||
e5e809f4 | 2680 | HOST_WIDE_INT offset = INTVAL (XEXP (bitfield, 2)); |
b88a3142 RK |
2681 | rtx insns; |
2682 | ||
6f086dfc | 2683 | /* Adjust OFFSET to count bits from low-address byte. */ |
f76b9db2 ILT |
2684 | if (BITS_BIG_ENDIAN != BYTES_BIG_ENDIAN) |
2685 | offset = (GET_MODE_BITSIZE (GET_MODE (XEXP (bitfield, 0))) | |
2686 | - offset - INTVAL (XEXP (bitfield, 1))); | |
2687 | ||
6f086dfc RS |
2688 | /* Adjust OFFSET to count bytes from low-address byte. */ |
2689 | offset /= BITS_PER_UNIT; | |
2690 | if (GET_CODE (XEXP (bitfield, 0)) == SUBREG) | |
2691 | { | |
2692 | offset += SUBREG_WORD (XEXP (bitfield, 0)) * UNITS_PER_WORD; | |
f76b9db2 ILT |
2693 | if (BYTES_BIG_ENDIAN) |
2694 | offset -= (MIN (UNITS_PER_WORD, | |
2695 | GET_MODE_SIZE (GET_MODE (XEXP (bitfield, 0)))) | |
2696 | - MIN (UNITS_PER_WORD, | |
2697 | GET_MODE_SIZE (GET_MODE (memref)))); | |
6f086dfc RS |
2698 | } |
2699 | ||
b88a3142 RK |
2700 | start_sequence (); |
2701 | memref = change_address (memref, mode, | |
6f086dfc | 2702 | plus_constant (XEXP (memref, 0), offset)); |
b88a3142 RK |
2703 | insns = get_insns (); |
2704 | end_sequence (); | |
2705 | emit_insns_before (insns, insn); | |
6f086dfc RS |
2706 | |
2707 | /* Store this memory reference where | |
2708 | we found the bit field reference. */ | |
2709 | ||
2710 | if (destflag) | |
2711 | { | |
2712 | validate_change (insn, &SET_DEST (body), memref, 1); | |
2713 | if (! CONSTANT_ADDRESS_P (SET_SRC (body))) | |
2714 | { | |
2715 | rtx src = SET_SRC (body); | |
2716 | while (GET_CODE (src) == SUBREG | |
2717 | && SUBREG_WORD (src) == 0) | |
2718 | src = SUBREG_REG (src); | |
2719 | if (GET_MODE (src) != GET_MODE (memref)) | |
2720 | src = gen_lowpart (GET_MODE (memref), SET_SRC (body)); | |
2721 | validate_change (insn, &SET_SRC (body), src, 1); | |
2722 | } | |
2723 | else if (GET_MODE (SET_SRC (body)) != VOIDmode | |
2724 | && GET_MODE (SET_SRC (body)) != GET_MODE (memref)) | |
2725 | /* This shouldn't happen because anything that didn't have | |
2726 | one of these modes should have got converted explicitly | |
2727 | and then referenced through a subreg. | |
2728 | This is so because the original bit-field was | |
2729 | handled by agg_mode and so its tree structure had | |
2730 | the same mode that memref now has. */ | |
2731 | abort (); | |
2732 | } | |
2733 | else | |
2734 | { | |
2735 | rtx dest = SET_DEST (body); | |
2736 | ||
2737 | while (GET_CODE (dest) == SUBREG | |
4013a709 RK |
2738 | && SUBREG_WORD (dest) == 0 |
2739 | && (GET_MODE_CLASS (GET_MODE (dest)) | |
ab87f8c8 JL |
2740 | == GET_MODE_CLASS (GET_MODE (SUBREG_REG (dest)))) |
2741 | && (GET_MODE_SIZE (GET_MODE (SUBREG_REG (dest))) | |
2742 | <= UNITS_PER_WORD)) | |
6f086dfc RS |
2743 | dest = SUBREG_REG (dest); |
2744 | ||
2745 | validate_change (insn, &SET_DEST (body), dest, 1); | |
2746 | ||
2747 | if (GET_MODE (dest) == GET_MODE (memref)) | |
2748 | validate_change (insn, &SET_SRC (body), memref, 1); | |
2749 | else | |
2750 | { | |
2751 | /* Convert the mem ref to the destination mode. */ | |
2752 | rtx newreg = gen_reg_rtx (GET_MODE (dest)); | |
2753 | ||
2754 | start_sequence (); | |
2755 | convert_move (newreg, memref, | |
2756 | GET_CODE (SET_SRC (body)) == ZERO_EXTRACT); | |
2757 | seq = get_insns (); | |
2758 | end_sequence (); | |
2759 | ||
2760 | validate_change (insn, &SET_SRC (body), newreg, 1); | |
2761 | } | |
2762 | } | |
2763 | ||
2764 | /* See if we can convert this extraction or insertion into | |
2765 | a simple move insn. We might not be able to do so if this | |
2766 | was, for example, part of a PARALLEL. | |
2767 | ||
2768 | If we succeed, write out any needed conversions. If we fail, | |
2769 | it is hard to guess why we failed, so don't do anything | |
2770 | special; just let the optimization be suppressed. */ | |
2771 | ||
2772 | if (apply_change_group () && seq) | |
2773 | emit_insns_before (seq, insn); | |
2774 | } | |
2775 | } | |
2776 | } | |
2777 | \f | |
2778 | /* These routines are responsible for converting virtual register references | |
2779 | to the actual hard register references once RTL generation is complete. | |
2780 | ||
2781 | The following four variables are used for communication between the | |
2782 | routines. They contain the offsets of the virtual registers from their | |
2783 | respective hard registers. */ | |
2784 | ||
2785 | static int in_arg_offset; | |
2786 | static int var_offset; | |
2787 | static int dynamic_offset; | |
2788 | static int out_arg_offset; | |
71038426 | 2789 | static int cfa_offset; |
6f086dfc RS |
2790 | |
2791 | /* In most machines, the stack pointer register is equivalent to the bottom | |
2792 | of the stack. */ | |
2793 | ||
2794 | #ifndef STACK_POINTER_OFFSET | |
2795 | #define STACK_POINTER_OFFSET 0 | |
2796 | #endif | |
2797 | ||
2798 | /* If not defined, pick an appropriate default for the offset of dynamically | |
2799 | allocated memory depending on the value of ACCUMULATE_OUTGOING_ARGS, | |
2800 | REG_PARM_STACK_SPACE, and OUTGOING_REG_PARM_STACK_SPACE. */ | |
2801 | ||
2802 | #ifndef STACK_DYNAMIC_OFFSET | |
2803 | ||
6f086dfc RS |
2804 | /* The bottom of the stack points to the actual arguments. If |
2805 | REG_PARM_STACK_SPACE is defined, this includes the space for the register | |
2806 | parameters. However, if OUTGOING_REG_PARM_STACK space is not defined, | |
718fe406 | 2807 | stack space for register parameters is not pushed by the caller, but |
6f086dfc RS |
2808 | rather part of the fixed stack areas and hence not included in |
2809 | `current_function_outgoing_args_size'. Nevertheless, we must allow | |
2810 | for it when allocating stack dynamic objects. */ | |
2811 | ||
2812 | #if defined(REG_PARM_STACK_SPACE) && ! defined(OUTGOING_REG_PARM_STACK_SPACE) | |
2813 | #define STACK_DYNAMIC_OFFSET(FNDECL) \ | |
f73ad30e JH |
2814 | ((ACCUMULATE_OUTGOING_ARGS \ |
2815 | ? (current_function_outgoing_args_size + REG_PARM_STACK_SPACE (FNDECL)) : 0)\ | |
2816 | + (STACK_POINTER_OFFSET)) \ | |
6f086dfc RS |
2817 | |
2818 | #else | |
2819 | #define STACK_DYNAMIC_OFFSET(FNDECL) \ | |
f73ad30e JH |
2820 | ((ACCUMULATE_OUTGOING_ARGS ? current_function_outgoing_args_size : 0) \ |
2821 | + (STACK_POINTER_OFFSET)) | |
6f086dfc RS |
2822 | #endif |
2823 | #endif | |
2824 | ||
2c849145 | 2825 | /* On most machines, the CFA coincides with the first incoming parm. */ |
71038426 RH |
2826 | |
2827 | #ifndef ARG_POINTER_CFA_OFFSET | |
2c849145 | 2828 | #define ARG_POINTER_CFA_OFFSET(FNDECL) FIRST_PARM_OFFSET (FNDECL) |
71038426 RH |
2829 | #endif |
2830 | ||
e9a25f70 JL |
2831 | /* Build up a (MEM (ADDRESSOF (REG))) rtx for a register REG that just had |
2832 | its address taken. DECL is the decl for the object stored in the | |
2833 | register, for later use if we do need to force REG into the stack. | |
2834 | REG is overwritten by the MEM like in put_reg_into_stack. */ | |
2835 | ||
2836 | rtx | |
2837 | gen_mem_addressof (reg, decl) | |
2838 | rtx reg; | |
2839 | tree decl; | |
2840 | { | |
8f985ec4 ZW |
2841 | rtx r = gen_rtx_ADDRESSOF (Pmode, gen_reg_rtx (GET_MODE (reg)), |
2842 | REGNO (reg), decl); | |
14a774a9 | 2843 | |
95ca22f4 | 2844 | /* If the original REG was a user-variable, then so is the REG whose |
14a774a9 | 2845 | address is being taken. Likewise for unchanging. */ |
95ca22f4 | 2846 | REG_USERVAR_P (XEXP (r, 0)) = REG_USERVAR_P (reg); |
14a774a9 | 2847 | RTX_UNCHANGING_P (XEXP (r, 0)) = RTX_UNCHANGING_P (reg); |
e9a25f70 | 2848 | |
e9a25f70 | 2849 | PUT_CODE (reg, MEM); |
ef178af3 | 2850 | XEXP (reg, 0) = r; |
8b4944fb RH |
2851 | if (decl) |
2852 | { | |
2853 | tree type = TREE_TYPE (decl); | |
2854 | ||
2855 | PUT_MODE (reg, DECL_MODE (decl)); | |
2856 | MEM_VOLATILE_P (reg) = TREE_SIDE_EFFECTS (decl); | |
2857 | MEM_SET_IN_STRUCT_P (reg, AGGREGATE_TYPE_P (type)); | |
2858 | MEM_ALIAS_SET (reg) = get_alias_set (decl); | |
e9a25f70 | 2859 | |
8b4944fb RH |
2860 | if (TREE_USED (decl) || DECL_INITIAL (decl) != 0) |
2861 | fixup_var_refs (reg, GET_MODE (reg), TREE_UNSIGNED (type), 0); | |
2862 | } | |
2863 | else | |
caa511fd JW |
2864 | { |
2865 | /* We have no alias information about this newly created MEM. */ | |
2866 | MEM_ALIAS_SET (reg) = 0; | |
2867 | ||
2868 | fixup_var_refs (reg, GET_MODE (reg), 0, 0); | |
2869 | } | |
e5e809f4 | 2870 | |
e9a25f70 JL |
2871 | return reg; |
2872 | } | |
2873 | ||
2874 | /* If DECL has an RTL that is an ADDRESSOF rtx, put it into the stack. */ | |
2875 | ||
2876 | void | |
2877 | flush_addressof (decl) | |
2878 | tree decl; | |
2879 | { | |
2880 | if ((TREE_CODE (decl) == PARM_DECL || TREE_CODE (decl) == VAR_DECL) | |
2881 | && DECL_RTL (decl) != 0 | |
2882 | && GET_CODE (DECL_RTL (decl)) == MEM | |
2883 | && GET_CODE (XEXP (DECL_RTL (decl), 0)) == ADDRESSOF | |
2884 | && GET_CODE (XEXP (XEXP (DECL_RTL (decl), 0), 0)) == REG) | |
fe9b4957 | 2885 | put_addressof_into_stack (XEXP (DECL_RTL (decl), 0), 0); |
e9a25f70 JL |
2886 | } |
2887 | ||
2888 | /* Force the register pointed to by R, an ADDRESSOF rtx, into the stack. */ | |
2889 | ||
2890 | static void | |
fe9b4957 | 2891 | put_addressof_into_stack (r, ht) |
e9a25f70 | 2892 | rtx r; |
fe9b4957 | 2893 | struct hash_table *ht; |
e9a25f70 | 2894 | { |
8b4944fb RH |
2895 | tree decl, type; |
2896 | int volatile_p, used_p; | |
2897 | ||
e9a25f70 JL |
2898 | rtx reg = XEXP (r, 0); |
2899 | ||
2900 | if (GET_CODE (reg) != REG) | |
2901 | abort (); | |
2902 | ||
8b4944fb RH |
2903 | decl = ADDRESSOF_DECL (r); |
2904 | if (decl) | |
2905 | { | |
2906 | type = TREE_TYPE (decl); | |
2907 | volatile_p = (TREE_CODE (decl) != SAVE_EXPR | |
2908 | && TREE_THIS_VOLATILE (decl)); | |
2909 | used_p = (TREE_USED (decl) | |
2910 | || (TREE_CODE (decl) != SAVE_EXPR | |
2911 | && DECL_INITIAL (decl) != 0)); | |
2912 | } | |
2913 | else | |
2914 | { | |
2915 | type = NULL_TREE; | |
2916 | volatile_p = 0; | |
2917 | used_p = 1; | |
2918 | } | |
2919 | ||
2920 | put_reg_into_stack (0, reg, type, GET_MODE (reg), GET_MODE (reg), | |
2921 | volatile_p, ADDRESSOF_REGNO (r), used_p, ht); | |
e9a25f70 JL |
2922 | } |
2923 | ||
b5bd3b3c AS |
2924 | /* List of replacements made below in purge_addressof_1 when creating |
2925 | bitfield insertions. */ | |
8b04083b VM |
2926 | static rtx purge_bitfield_addressof_replacements; |
2927 | ||
2928 | /* List of replacements made below in purge_addressof_1 for patterns | |
2929 | (MEM (ADDRESSOF (REG ...))). The key of the list entry is the | |
2930 | corresponding (ADDRESSOF (REG ...)) and value is a substitution for | |
2931 | the all pattern. List PURGE_BITFIELD_ADDRESSOF_REPLACEMENTS is not | |
2932 | enough in complex cases, e.g. when some field values can be | |
718fe406 | 2933 | extracted by usage MEM with narrower mode. */ |
b5bd3b3c AS |
2934 | static rtx purge_addressof_replacements; |
2935 | ||
e9a25f70 JL |
2936 | /* Helper function for purge_addressof. See if the rtx expression at *LOC |
2937 | in INSN needs to be changed. If FORCE, always put any ADDRESSOFs into | |
8c36698e NC |
2938 | the stack. If the function returns FALSE then the replacement could not |
2939 | be made. */ | |
e9a25f70 | 2940 | |
8c36698e | 2941 | static boolean |
fe9b4957 | 2942 | purge_addressof_1 (loc, insn, force, store, ht) |
e9a25f70 JL |
2943 | rtx *loc; |
2944 | rtx insn; | |
f7b6d104 | 2945 | int force, store; |
fe9b4957 | 2946 | struct hash_table *ht; |
e9a25f70 JL |
2947 | { |
2948 | rtx x; | |
2949 | RTX_CODE code; | |
2950 | int i, j; | |
6f7d635c | 2951 | const char *fmt; |
8c36698e | 2952 | boolean result = true; |
e9a25f70 JL |
2953 | |
2954 | /* Re-start here to avoid recursion in common cases. */ | |
2955 | restart: | |
2956 | ||
2957 | x = *loc; | |
2958 | if (x == 0) | |
8c36698e | 2959 | return true; |
e9a25f70 JL |
2960 | |
2961 | code = GET_CODE (x); | |
2962 | ||
c5c76735 JL |
2963 | /* If we don't return in any of the cases below, we will recurse inside |
2964 | the RTX, which will normally result in any ADDRESSOF being forced into | |
2965 | memory. */ | |
2966 | if (code == SET) | |
2967 | { | |
8c36698e NC |
2968 | result = purge_addressof_1 (&SET_DEST (x), insn, force, 1, ht); |
2969 | result &= purge_addressof_1 (&SET_SRC (x), insn, force, 0, ht); | |
2970 | return result; | |
c5c76735 JL |
2971 | } |
2972 | ||
2973 | else if (code == ADDRESSOF && GET_CODE (XEXP (x, 0)) == MEM) | |
e9a25f70 | 2974 | { |
956d6950 JL |
2975 | /* We must create a copy of the rtx because it was created by |
2976 | overwriting a REG rtx which is always shared. */ | |
2977 | rtx sub = copy_rtx (XEXP (XEXP (x, 0), 0)); | |
c5c76735 | 2978 | rtx insns; |
e9a25f70 | 2979 | |
ab87f8c8 JL |
2980 | if (validate_change (insn, loc, sub, 0) |
2981 | || validate_replace_rtx (x, sub, insn)) | |
8c36698e | 2982 | return true; |
718fe406 | 2983 | |
e9a25f70 | 2984 | start_sequence (); |
ab87f8c8 JL |
2985 | sub = force_operand (sub, NULL_RTX); |
2986 | if (! validate_change (insn, loc, sub, 0) | |
2987 | && ! validate_replace_rtx (x, sub, insn)) | |
e9a25f70 JL |
2988 | abort (); |
2989 | ||
f7b6d104 | 2990 | insns = gen_sequence (); |
e9a25f70 | 2991 | end_sequence (); |
18e765cb | 2992 | emit_insn_before (insns, insn); |
8c36698e | 2993 | return true; |
e9a25f70 | 2994 | } |
c5c76735 | 2995 | |
e9a25f70 JL |
2996 | else if (code == MEM && GET_CODE (XEXP (x, 0)) == ADDRESSOF && ! force) |
2997 | { | |
2998 | rtx sub = XEXP (XEXP (x, 0), 0); | |
ab87f8c8 | 2999 | rtx sub2; |
e5e809f4 | 3000 | |
6d8ccdbb | 3001 | if (GET_CODE (sub) == MEM) |
ab87f8c8 JL |
3002 | { |
3003 | sub2 = gen_rtx_MEM (GET_MODE (x), copy_rtx (XEXP (sub, 0))); | |
3004 | MEM_COPY_ATTRIBUTES (sub2, sub); | |
ab87f8c8 JL |
3005 | sub = sub2; |
3006 | } | |
c5c76735 JL |
3007 | else if (GET_CODE (sub) == REG |
3008 | && (MEM_VOLATILE_P (x) || GET_MODE (x) == BLKmode)) | |
3009 | ; | |
e5e809f4 | 3010 | else if (GET_CODE (sub) == REG && GET_MODE (x) != GET_MODE (sub)) |
e9a25f70 | 3011 | { |
f7b6d104 RH |
3012 | int size_x, size_sub; |
3013 | ||
b5bd3b3c AS |
3014 | if (!insn) |
3015 | { | |
3016 | /* When processing REG_NOTES look at the list of | |
3017 | replacements done on the insn to find the register that X | |
3018 | was replaced by. */ | |
3019 | rtx tem; | |
3020 | ||
8b04083b VM |
3021 | for (tem = purge_bitfield_addressof_replacements; |
3022 | tem != NULL_RTX; | |
b5bd3b3c | 3023 | tem = XEXP (XEXP (tem, 1), 1)) |
8b04083b VM |
3024 | if (rtx_equal_p (x, XEXP (tem, 0))) |
3025 | { | |
3026 | *loc = XEXP (XEXP (tem, 1), 0); | |
8c36698e | 3027 | return true; |
8b04083b | 3028 | } |
fbdfe39c | 3029 | |
718fe406 | 3030 | /* See comment for purge_addressof_replacements. */ |
8b04083b VM |
3031 | for (tem = purge_addressof_replacements; |
3032 | tem != NULL_RTX; | |
3033 | tem = XEXP (XEXP (tem, 1), 1)) | |
3034 | if (rtx_equal_p (XEXP (x, 0), XEXP (tem, 0))) | |
3035 | { | |
3036 | rtx z = XEXP (XEXP (tem, 1), 0); | |
fbdfe39c | 3037 | |
8b04083b VM |
3038 | if (GET_MODE (x) == GET_MODE (z) |
3039 | || (GET_CODE (XEXP (XEXP (tem, 1), 0)) != REG | |
3040 | && GET_CODE (XEXP (XEXP (tem, 1), 0)) != SUBREG)) | |
3041 | abort (); | |
3042 | ||
3043 | /* It can happen that the note may speak of things | |
3044 | in a wider (or just different) mode than the | |
3045 | code did. This is especially true of | |
718fe406 | 3046 | REG_RETVAL. */ |
8b04083b VM |
3047 | |
3048 | if (GET_CODE (z) == SUBREG && SUBREG_WORD (z) == 0) | |
3049 | z = SUBREG_REG (z); | |
718fe406 | 3050 | |
8b04083b VM |
3051 | if (GET_MODE_SIZE (GET_MODE (x)) > UNITS_PER_WORD |
3052 | && (GET_MODE_SIZE (GET_MODE (x)) | |
3053 | > GET_MODE_SIZE (GET_MODE (z)))) | |
3054 | { | |
3055 | /* This can occur as a result in invalid | |
718fe406 | 3056 | pointer casts, e.g. float f; ... |
8b04083b VM |
3057 | *(long long int *)&f. |
3058 | ??? We could emit a warning here, but | |
3059 | without a line number that wouldn't be | |
3060 | very helpful. */ | |
3061 | z = gen_rtx_SUBREG (GET_MODE (x), z, 0); | |
3062 | } | |
3063 | else | |
3064 | z = gen_lowpart (GET_MODE (x), z); | |
3065 | ||
3066 | *loc = z; | |
aa608fe6 | 3067 | return true; |
8b04083b | 3068 | } |
b5bd3b3c | 3069 | |
8c36698e NC |
3070 | /* Sometimes we may not be able to find the replacement. For |
3071 | example when the original insn was a MEM in a wider mode, | |
3072 | and the note is part of a sign extension of a narrowed | |
3073 | version of that MEM. Gcc testcase compile/990829-1.c can | |
3074 | generate an example of this siutation. Rather than complain | |
3075 | we return false, which will prompt our caller to remove the | |
3076 | offending note. */ | |
3077 | return false; | |
b5bd3b3c AS |
3078 | } |
3079 | ||
f7b6d104 RH |
3080 | size_x = GET_MODE_BITSIZE (GET_MODE (x)); |
3081 | size_sub = GET_MODE_BITSIZE (GET_MODE (sub)); | |
3082 | ||
3083 | /* Don't even consider working with paradoxical subregs, | |
3084 | or the moral equivalent seen here. */ | |
470032d7 | 3085 | if (size_x <= size_sub |
d006aa54 | 3086 | && int_mode_for_mode (GET_MODE (sub)) != BLKmode) |
e9a25f70 | 3087 | { |
f7b6d104 RH |
3088 | /* Do a bitfield insertion to mirror what would happen |
3089 | in memory. */ | |
3090 | ||
f7b6d104 RH |
3091 | rtx val, seq; |
3092 | ||
f7b6d104 RH |
3093 | if (store) |
3094 | { | |
fe9b4957 | 3095 | rtx p = PREV_INSN (insn); |
de0dd934 | 3096 | |
f7b6d104 RH |
3097 | start_sequence (); |
3098 | val = gen_reg_rtx (GET_MODE (x)); | |
3099 | if (! validate_change (insn, loc, val, 0)) | |
b5bd3b3c AS |
3100 | { |
3101 | /* Discard the current sequence and put the | |
3102 | ADDRESSOF on stack. */ | |
3103 | end_sequence (); | |
3104 | goto give_up; | |
3105 | } | |
f7b6d104 RH |
3106 | seq = gen_sequence (); |
3107 | end_sequence (); | |
3108 | emit_insn_before (seq, insn); | |
718fe406 | 3109 | compute_insns_for_mem (p ? NEXT_INSN (p) : get_insns (), |
fe9b4957 | 3110 | insn, ht); |
718fe406 | 3111 | |
f7b6d104 | 3112 | start_sequence (); |
47401c4d | 3113 | store_bit_field (sub, size_x, 0, GET_MODE (x), |
f7b6d104 | 3114 | val, GET_MODE_SIZE (GET_MODE (sub)), |
19caa751 | 3115 | GET_MODE_ALIGNMENT (GET_MODE (sub))); |
f7b6d104 | 3116 | |
de0dd934 R |
3117 | /* Make sure to unshare any shared rtl that store_bit_field |
3118 | might have created. */ | |
d1b81779 | 3119 | unshare_all_rtl_again (get_insns ()); |
de0dd934 | 3120 | |
f7b6d104 RH |
3121 | seq = gen_sequence (); |
3122 | end_sequence (); | |
fe9b4957 MM |
3123 | p = emit_insn_after (seq, insn); |
3124 | if (NEXT_INSN (insn)) | |
718fe406 | 3125 | compute_insns_for_mem (NEXT_INSN (insn), |
fe9b4957 MM |
3126 | p ? NEXT_INSN (p) : NULL_RTX, |
3127 | ht); | |
f7b6d104 RH |
3128 | } |
3129 | else | |
3130 | { | |
fe9b4957 MM |
3131 | rtx p = PREV_INSN (insn); |
3132 | ||
f7b6d104 | 3133 | start_sequence (); |
47401c4d | 3134 | val = extract_bit_field (sub, size_x, 0, 1, NULL_RTX, |
f7b6d104 RH |
3135 | GET_MODE (x), GET_MODE (x), |
3136 | GET_MODE_SIZE (GET_MODE (sub)), | |
3137 | GET_MODE_SIZE (GET_MODE (sub))); | |
3138 | ||
f7b6d104 | 3139 | if (! validate_change (insn, loc, val, 0)) |
b5bd3b3c AS |
3140 | { |
3141 | /* Discard the current sequence and put the | |
3142 | ADDRESSOF on stack. */ | |
3143 | end_sequence (); | |
3144 | goto give_up; | |
3145 | } | |
f7b6d104 RH |
3146 | |
3147 | seq = gen_sequence (); | |
3148 | end_sequence (); | |
3149 | emit_insn_before (seq, insn); | |
fe9b4957 MM |
3150 | compute_insns_for_mem (p ? NEXT_INSN (p) : get_insns (), |
3151 | insn, ht); | |
f7b6d104 RH |
3152 | } |
3153 | ||
b5bd3b3c AS |
3154 | /* Remember the replacement so that the same one can be done |
3155 | on the REG_NOTES. */ | |
8b04083b | 3156 | purge_bitfield_addressof_replacements |
b5bd3b3c | 3157 | = gen_rtx_EXPR_LIST (VOIDmode, x, |
8b04083b VM |
3158 | gen_rtx_EXPR_LIST |
3159 | (VOIDmode, val, | |
3160 | purge_bitfield_addressof_replacements)); | |
b5bd3b3c | 3161 | |
f7b6d104 | 3162 | /* We replaced with a reg -- all done. */ |
8c36698e | 3163 | return true; |
e9a25f70 JL |
3164 | } |
3165 | } | |
c5c76735 | 3166 | |
e9a25f70 | 3167 | else if (validate_change (insn, loc, sub, 0)) |
fbdfe39c RH |
3168 | { |
3169 | /* Remember the replacement so that the same one can be done | |
3170 | on the REG_NOTES. */ | |
8b04083b VM |
3171 | if (GET_CODE (sub) == REG || GET_CODE (sub) == SUBREG) |
3172 | { | |
3173 | rtx tem; | |
3174 | ||
3175 | for (tem = purge_addressof_replacements; | |
3176 | tem != NULL_RTX; | |
3177 | tem = XEXP (XEXP (tem, 1), 1)) | |
3178 | if (rtx_equal_p (XEXP (x, 0), XEXP (tem, 0))) | |
3179 | { | |
3180 | XEXP (XEXP (tem, 1), 0) = sub; | |
8c36698e | 3181 | return true; |
8b04083b VM |
3182 | } |
3183 | purge_addressof_replacements | |
3184 | = gen_rtx (EXPR_LIST, VOIDmode, XEXP (x, 0), | |
3185 | gen_rtx_EXPR_LIST (VOIDmode, sub, | |
3186 | purge_addressof_replacements)); | |
8c36698e | 3187 | return true; |
8b04083b | 3188 | } |
fbdfe39c RH |
3189 | goto restart; |
3190 | } | |
b5bd3b3c | 3191 | give_up:; |
e9a25f70 JL |
3192 | /* else give up and put it into the stack */ |
3193 | } | |
c5c76735 | 3194 | |
e9a25f70 JL |
3195 | else if (code == ADDRESSOF) |
3196 | { | |
fe9b4957 | 3197 | put_addressof_into_stack (x, ht); |
aa608fe6 | 3198 | return true; |
e9a25f70 | 3199 | } |
f7b6d104 RH |
3200 | else if (code == SET) |
3201 | { | |
8c36698e NC |
3202 | result = purge_addressof_1 (&SET_DEST (x), insn, force, 1, ht); |
3203 | result &= purge_addressof_1 (&SET_SRC (x), insn, force, 0, ht); | |
3204 | return result; | |
f7b6d104 | 3205 | } |
e9a25f70 | 3206 | |
718fe406 | 3207 | /* Scan all subexpressions. */ |
e9a25f70 JL |
3208 | fmt = GET_RTX_FORMAT (code); |
3209 | for (i = 0; i < GET_RTX_LENGTH (code); i++, fmt++) | |
3210 | { | |
3211 | if (*fmt == 'e') | |
8c36698e | 3212 | result &= purge_addressof_1 (&XEXP (x, i), insn, force, 0, ht); |
e9a25f70 JL |
3213 | else if (*fmt == 'E') |
3214 | for (j = 0; j < XVECLEN (x, i); j++) | |
8c36698e | 3215 | result &= purge_addressof_1 (&XVECEXP (x, i, j), insn, force, 0, ht); |
fe9b4957 | 3216 | } |
8c36698e NC |
3217 | |
3218 | return result; | |
fe9b4957 MM |
3219 | } |
3220 | ||
3221 | /* Return a new hash table entry in HT. */ | |
3222 | ||
3223 | static struct hash_entry * | |
3224 | insns_for_mem_newfunc (he, ht, k) | |
3225 | struct hash_entry *he; | |
3226 | struct hash_table *ht; | |
3227 | hash_table_key k ATTRIBUTE_UNUSED; | |
3228 | { | |
3229 | struct insns_for_mem_entry *ifmhe; | |
3230 | if (he) | |
3231 | return he; | |
3232 | ||
3233 | ifmhe = ((struct insns_for_mem_entry *) | |
3234 | hash_allocate (ht, sizeof (struct insns_for_mem_entry))); | |
3235 | ifmhe->insns = NULL_RTX; | |
3236 | ||
3237 | return &ifmhe->he; | |
3238 | } | |
3239 | ||
3240 | /* Return a hash value for K, a REG. */ | |
3241 | ||
3242 | static unsigned long | |
3243 | insns_for_mem_hash (k) | |
3244 | hash_table_key k; | |
3245 | { | |
3246 | /* K is really a RTX. Just use the address as the hash value. */ | |
3247 | return (unsigned long) k; | |
3248 | } | |
3249 | ||
3250 | /* Return non-zero if K1 and K2 (two REGs) are the same. */ | |
3251 | ||
3252 | static boolean | |
3253 | insns_for_mem_comp (k1, k2) | |
3254 | hash_table_key k1; | |
3255 | hash_table_key k2; | |
3256 | { | |
3257 | return k1 == k2; | |
3258 | } | |
3259 | ||
3260 | struct insns_for_mem_walk_info { | |
3261 | /* The hash table that we are using to record which INSNs use which | |
3262 | MEMs. */ | |
3263 | struct hash_table *ht; | |
3264 | ||
3265 | /* The INSN we are currently proessing. */ | |
3266 | rtx insn; | |
3267 | ||
3268 | /* Zero if we are walking to find ADDRESSOFs, one if we are walking | |
3269 | to find the insns that use the REGs in the ADDRESSOFs. */ | |
3270 | int pass; | |
3271 | }; | |
3272 | ||
3273 | /* Called from compute_insns_for_mem via for_each_rtx. If R is a REG | |
3274 | that might be used in an ADDRESSOF expression, record this INSN in | |
3275 | the hash table given by DATA (which is really a pointer to an | |
3276 | insns_for_mem_walk_info structure). */ | |
3277 | ||
3278 | static int | |
3279 | insns_for_mem_walk (r, data) | |
3280 | rtx *r; | |
3281 | void *data; | |
3282 | { | |
718fe406 | 3283 | struct insns_for_mem_walk_info *ifmwi |
fe9b4957 MM |
3284 | = (struct insns_for_mem_walk_info *) data; |
3285 | ||
3286 | if (ifmwi->pass == 0 && *r && GET_CODE (*r) == ADDRESSOF | |
3287 | && GET_CODE (XEXP (*r, 0)) == REG) | |
3288 | hash_lookup (ifmwi->ht, XEXP (*r, 0), /*create=*/1, /*copy=*/0); | |
3289 | else if (ifmwi->pass == 1 && *r && GET_CODE (*r) == REG) | |
3290 | { | |
3291 | /* Lookup this MEM in the hashtable, creating it if necessary. */ | |
718fe406 | 3292 | struct insns_for_mem_entry *ifme |
fe9b4957 MM |
3293 | = (struct insns_for_mem_entry *) hash_lookup (ifmwi->ht, |
3294 | *r, | |
3295 | /*create=*/0, | |
3296 | /*copy=*/0); | |
3297 | ||
3298 | /* If we have not already recorded this INSN, do so now. Since | |
3299 | we process the INSNs in order, we know that if we have | |
3300 | recorded it it must be at the front of the list. */ | |
3301 | if (ifme && (!ifme->insns || XEXP (ifme->insns, 0) != ifmwi->insn)) | |
1f8f4a0b MM |
3302 | ifme->insns = gen_rtx_EXPR_LIST (VOIDmode, ifmwi->insn, |
3303 | ifme->insns); | |
e9a25f70 | 3304 | } |
fe9b4957 MM |
3305 | |
3306 | return 0; | |
3307 | } | |
3308 | ||
3309 | /* Walk the INSNS, until we reach LAST_INSN, recording which INSNs use | |
3310 | which REGs in HT. */ | |
3311 | ||
3312 | static void | |
3313 | compute_insns_for_mem (insns, last_insn, ht) | |
3314 | rtx insns; | |
3315 | rtx last_insn; | |
3316 | struct hash_table *ht; | |
3317 | { | |
3318 | rtx insn; | |
3319 | struct insns_for_mem_walk_info ifmwi; | |
3320 | ifmwi.ht = ht; | |
3321 | ||
3322 | for (ifmwi.pass = 0; ifmwi.pass < 2; ++ifmwi.pass) | |
3323 | for (insn = insns; insn != last_insn; insn = NEXT_INSN (insn)) | |
2c3c49de | 3324 | if (INSN_P (insn)) |
fe9b4957 MM |
3325 | { |
3326 | ifmwi.insn = insn; | |
3327 | for_each_rtx (&insn, insns_for_mem_walk, &ifmwi); | |
3328 | } | |
e9a25f70 JL |
3329 | } |
3330 | ||
8c36698e NC |
3331 | /* Helper function for purge_addressof called through for_each_rtx. |
3332 | Returns true iff the rtl is an ADDRESSOF. */ | |
3333 | static int | |
3334 | is_addressof (rtl, data) | |
718fe406 KH |
3335 | rtx *rtl; |
3336 | void *data ATTRIBUTE_UNUSED; | |
8c36698e | 3337 | { |
718fe406 | 3338 | return GET_CODE (*rtl) == ADDRESSOF; |
8c36698e NC |
3339 | } |
3340 | ||
e9a25f70 JL |
3341 | /* Eliminate all occurrences of ADDRESSOF from INSNS. Elide any remaining |
3342 | (MEM (ADDRESSOF)) patterns, and force any needed registers into the | |
3343 | stack. */ | |
3344 | ||
3345 | void | |
3346 | purge_addressof (insns) | |
3347 | rtx insns; | |
3348 | { | |
3349 | rtx insn; | |
fe9b4957 | 3350 | struct hash_table ht; |
718fe406 | 3351 | |
fe9b4957 MM |
3352 | /* When we actually purge ADDRESSOFs, we turn REGs into MEMs. That |
3353 | requires a fixup pass over the instruction stream to correct | |
3354 | INSNs that depended on the REG being a REG, and not a MEM. But, | |
bedda2da | 3355 | these fixup passes are slow. Furthermore, most MEMs are not |
fe9b4957 MM |
3356 | mentioned in very many instructions. So, we speed up the process |
3357 | by pre-calculating which REGs occur in which INSNs; that allows | |
3358 | us to perform the fixup passes much more quickly. */ | |
718fe406 | 3359 | hash_table_init (&ht, |
fe9b4957 MM |
3360 | insns_for_mem_newfunc, |
3361 | insns_for_mem_hash, | |
3362 | insns_for_mem_comp); | |
3363 | compute_insns_for_mem (insns, NULL_RTX, &ht); | |
3364 | ||
e9a25f70 JL |
3365 | for (insn = insns; insn; insn = NEXT_INSN (insn)) |
3366 | if (GET_CODE (insn) == INSN || GET_CODE (insn) == JUMP_INSN | |
3367 | || GET_CODE (insn) == CALL_INSN) | |
3368 | { | |
8c36698e NC |
3369 | if (! purge_addressof_1 (&PATTERN (insn), insn, |
3370 | asm_noperands (PATTERN (insn)) > 0, 0, &ht)) | |
3371 | /* If we could not replace the ADDRESSOFs in the insn, | |
3372 | something is wrong. */ | |
3373 | abort (); | |
718fe406 | 3374 | |
8c36698e NC |
3375 | if (! purge_addressof_1 (®_NOTES (insn), NULL_RTX, 0, 0, &ht)) |
3376 | { | |
3377 | /* If we could not replace the ADDRESSOFs in the insn's notes, | |
3378 | we can just remove the offending notes instead. */ | |
3379 | rtx note; | |
3380 | ||
3381 | for (note = REG_NOTES (insn); note; note = XEXP (note, 1)) | |
3382 | { | |
3383 | /* If we find a REG_RETVAL note then the insn is a libcall. | |
3384 | Such insns must have REG_EQUAL notes as well, in order | |
3385 | for later passes of the compiler to work. So it is not | |
3386 | safe to delete the notes here, and instead we abort. */ | |
3387 | if (REG_NOTE_KIND (note) == REG_RETVAL) | |
3388 | abort (); | |
718fe406 | 3389 | if (for_each_rtx (¬e, is_addressof, NULL)) |
8c36698e NC |
3390 | remove_note (insn, note); |
3391 | } | |
3392 | } | |
e9a25f70 | 3393 | } |
fe9b4957 MM |
3394 | |
3395 | /* Clean up. */ | |
3396 | hash_table_free (&ht); | |
8b04083b | 3397 | purge_bitfield_addressof_replacements = 0; |
da9b1f9c | 3398 | purge_addressof_replacements = 0; |
4fa48eae JL |
3399 | |
3400 | /* REGs are shared. purge_addressof will destructively replace a REG | |
3401 | with a MEM, which creates shared MEMs. | |
3402 | ||
3403 | Unfortunately, the children of put_reg_into_stack assume that MEMs | |
3404 | referring to the same stack slot are shared (fixup_var_refs and | |
3405 | the associated hash table code). | |
3406 | ||
3407 | So, we have to do another unsharing pass after we have flushed any | |
3408 | REGs that had their address taken into the stack. | |
3409 | ||
3410 | It may be worth tracking whether or not we converted any REGs into | |
3411 | MEMs to avoid this overhead when it is not needed. */ | |
3412 | unshare_all_rtl_again (get_insns ()); | |
e9a25f70 JL |
3413 | } |
3414 | \f | |
659e47fb AH |
3415 | /* Convert a SET of a hard subreg to a set of the appropriet hard |
3416 | register. A subroutine of purge_hard_subreg_sets. */ | |
3417 | ||
3418 | static void | |
3419 | purge_single_hard_subreg_set (pattern) | |
3420 | rtx pattern; | |
3421 | { | |
3422 | rtx reg = SET_DEST (pattern); | |
3423 | enum machine_mode mode = GET_MODE (SET_DEST (pattern)); | |
3424 | int word = 0; | |
3425 | ||
3426 | while (GET_CODE (reg) == SUBREG) | |
3427 | { | |
3428 | word += SUBREG_WORD (reg); | |
3429 | reg = SUBREG_REG (reg); | |
3430 | } | |
3431 | ||
3432 | if (REGNO (reg) < FIRST_PSEUDO_REGISTER) | |
3433 | { | |
3434 | reg = gen_rtx_REG (mode, REGNO (reg) + word); | |
3435 | SET_DEST (pattern) = reg; | |
3436 | } | |
3437 | } | |
3438 | ||
3439 | /* Eliminate all occurrences of SETs of hard subregs from INSNS. The | |
3440 | only such SETs that we expect to see are those left in because | |
3441 | integrate can't handle sets of parts of a return value register. | |
3442 | ||
3443 | We don't use alter_subreg because we only want to eliminate subregs | |
3444 | of hard registers. */ | |
3445 | ||
3446 | void | |
3447 | purge_hard_subreg_sets (insn) | |
3448 | rtx insn; | |
3449 | { | |
3450 | for (; insn; insn = NEXT_INSN (insn)) | |
3451 | { | |
3452 | if (INSN_P (insn)) | |
3453 | { | |
3454 | rtx pattern = PATTERN (insn); | |
3455 | switch (GET_CODE (pattern)) | |
3456 | { | |
3457 | case SET: | |
3458 | if (GET_CODE (SET_DEST (pattern)) == SUBREG) | |
3459 | purge_single_hard_subreg_set (pattern); | |
3460 | break; | |
3461 | case PARALLEL: | |
3462 | { | |
3463 | int j; | |
3464 | for (j = XVECLEN (pattern, 0) - 1; j >= 0; j--) | |
3465 | { | |
3466 | rtx inner_pattern = XVECEXP (pattern, 0, j); | |
3467 | if (GET_CODE (inner_pattern) == SET | |
3468 | && GET_CODE (SET_DEST (inner_pattern)) == SUBREG) | |
3469 | purge_single_hard_subreg_set (inner_pattern); | |
3470 | } | |
3471 | } | |
3472 | break; | |
3473 | default: | |
3474 | break; | |
3475 | } | |
3476 | } | |
3477 | } | |
3478 | } | |
3479 | \f | |
6f086dfc RS |
3480 | /* Pass through the INSNS of function FNDECL and convert virtual register |
3481 | references to hard register references. */ | |
3482 | ||
3483 | void | |
3484 | instantiate_virtual_regs (fndecl, insns) | |
3485 | tree fndecl; | |
3486 | rtx insns; | |
3487 | { | |
3488 | rtx insn; | |
770ae6cc | 3489 | unsigned int i; |
6f086dfc RS |
3490 | |
3491 | /* Compute the offsets to use for this function. */ | |
3492 | in_arg_offset = FIRST_PARM_OFFSET (fndecl); | |
3493 | var_offset = STARTING_FRAME_OFFSET; | |
3494 | dynamic_offset = STACK_DYNAMIC_OFFSET (fndecl); | |
3495 | out_arg_offset = STACK_POINTER_OFFSET; | |
2c849145 | 3496 | cfa_offset = ARG_POINTER_CFA_OFFSET (fndecl); |
6f086dfc RS |
3497 | |
3498 | /* Scan all variables and parameters of this function. For each that is | |
3499 | in memory, instantiate all virtual registers if the result is a valid | |
3500 | address. If not, we do it later. That will handle most uses of virtual | |
3501 | regs on many machines. */ | |
3502 | instantiate_decls (fndecl, 1); | |
3503 | ||
3504 | /* Initialize recognition, indicating that volatile is OK. */ | |
3505 | init_recog (); | |
3506 | ||
3507 | /* Scan through all the insns, instantiating every virtual register still | |
3508 | present. */ | |
3509 | for (insn = insns; insn; insn = NEXT_INSN (insn)) | |
3510 | if (GET_CODE (insn) == INSN || GET_CODE (insn) == JUMP_INSN | |
3511 | || GET_CODE (insn) == CALL_INSN) | |
3512 | { | |
3513 | instantiate_virtual_regs_1 (&PATTERN (insn), insn, 1); | |
5f4f0e22 | 3514 | instantiate_virtual_regs_1 (®_NOTES (insn), NULL_RTX, 0); |
6f086dfc RS |
3515 | } |
3516 | ||
e9a25f70 JL |
3517 | /* Instantiate the stack slots for the parm registers, for later use in |
3518 | addressof elimination. */ | |
3519 | for (i = 0; i < max_parm_reg; ++i) | |
3520 | if (parm_reg_stack_loc[i]) | |
3521 | instantiate_virtual_regs_1 (&parm_reg_stack_loc[i], NULL_RTX, 0); | |
3522 | ||
6f086dfc RS |
3523 | /* Now instantiate the remaining register equivalences for debugging info. |
3524 | These will not be valid addresses. */ | |
3525 | instantiate_decls (fndecl, 0); | |
3526 | ||
3527 | /* Indicate that, from now on, assign_stack_local should use | |
3528 | frame_pointer_rtx. */ | |
3529 | virtuals_instantiated = 1; | |
3530 | } | |
3531 | ||
3532 | /* Scan all decls in FNDECL (both variables and parameters) and instantiate | |
3533 | all virtual registers in their DECL_RTL's. | |
3534 | ||
3535 | If VALID_ONLY, do this only if the resulting address is still valid. | |
3536 | Otherwise, always do it. */ | |
3537 | ||
3538 | static void | |
3539 | instantiate_decls (fndecl, valid_only) | |
3540 | tree fndecl; | |
3541 | int valid_only; | |
3542 | { | |
3543 | tree decl; | |
3544 | ||
6f086dfc RS |
3545 | /* Process all parameters of the function. */ |
3546 | for (decl = DECL_ARGUMENTS (fndecl); decl; decl = TREE_CHAIN (decl)) | |
3547 | { | |
e5e809f4 JL |
3548 | HOST_WIDE_INT size = int_size_in_bytes (TREE_TYPE (decl)); |
3549 | ||
718fe406 | 3550 | instantiate_decl (DECL_RTL (decl), size, valid_only); |
ce717ce4 JW |
3551 | |
3552 | /* If the parameter was promoted, then the incoming RTL mode may be | |
3553 | larger than the declared type size. We must use the larger of | |
3554 | the two sizes. */ | |
3555 | size = MAX (GET_MODE_SIZE (GET_MODE (DECL_INCOMING_RTL (decl))), size); | |
3556 | instantiate_decl (DECL_INCOMING_RTL (decl), size, valid_only); | |
6f086dfc RS |
3557 | } |
3558 | ||
0f41302f | 3559 | /* Now process all variables defined in the function or its subblocks. */ |
6f086dfc | 3560 | instantiate_decls_1 (DECL_INITIAL (fndecl), valid_only); |
6f086dfc RS |
3561 | } |
3562 | ||
3563 | /* Subroutine of instantiate_decls: Process all decls in the given | |
3564 | BLOCK node and all its subblocks. */ | |
3565 | ||
3566 | static void | |
3567 | instantiate_decls_1 (let, valid_only) | |
3568 | tree let; | |
3569 | int valid_only; | |
3570 | { | |
3571 | tree t; | |
3572 | ||
3573 | for (t = BLOCK_VARS (let); t; t = TREE_CHAIN (t)) | |
5a73491b RK |
3574 | instantiate_decl (DECL_RTL (t), int_size_in_bytes (TREE_TYPE (t)), |
3575 | valid_only); | |
6f086dfc RS |
3576 | |
3577 | /* Process all subblocks. */ | |
3578 | for (t = BLOCK_SUBBLOCKS (let); t; t = TREE_CHAIN (t)) | |
3579 | instantiate_decls_1 (t, valid_only); | |
3580 | } | |
5a73491b | 3581 | |
8008b228 | 3582 | /* Subroutine of the preceding procedures: Given RTL representing a |
5a73491b RK |
3583 | decl and the size of the object, do any instantiation required. |
3584 | ||
3585 | If VALID_ONLY is non-zero, it means that the RTL should only be | |
3586 | changed if the new address is valid. */ | |
3587 | ||
3588 | static void | |
3589 | instantiate_decl (x, size, valid_only) | |
3590 | rtx x; | |
770ae6cc | 3591 | HOST_WIDE_INT size; |
5a73491b RK |
3592 | int valid_only; |
3593 | { | |
3594 | enum machine_mode mode; | |
3595 | rtx addr; | |
3596 | ||
3597 | /* If this is not a MEM, no need to do anything. Similarly if the | |
3598 | address is a constant or a register that is not a virtual register. */ | |
3599 | ||
3600 | if (x == 0 || GET_CODE (x) != MEM) | |
3601 | return; | |
3602 | ||
3603 | addr = XEXP (x, 0); | |
3604 | if (CONSTANT_P (addr) | |
956d6950 | 3605 | || (GET_CODE (addr) == ADDRESSOF && GET_CODE (XEXP (addr, 0)) == REG) |
5a73491b RK |
3606 | || (GET_CODE (addr) == REG |
3607 | && (REGNO (addr) < FIRST_VIRTUAL_REGISTER | |
3608 | || REGNO (addr) > LAST_VIRTUAL_REGISTER))) | |
3609 | return; | |
3610 | ||
3611 | /* If we should only do this if the address is valid, copy the address. | |
3612 | We need to do this so we can undo any changes that might make the | |
3613 | address invalid. This copy is unfortunate, but probably can't be | |
3614 | avoided. */ | |
3615 | ||
3616 | if (valid_only) | |
3617 | addr = copy_rtx (addr); | |
3618 | ||
3619 | instantiate_virtual_regs_1 (&addr, NULL_RTX, 0); | |
3620 | ||
770ae6cc | 3621 | if (valid_only && size >= 0) |
87ce34d6 | 3622 | { |
770ae6cc RK |
3623 | unsigned HOST_WIDE_INT decl_size = size; |
3624 | ||
87ce34d6 JW |
3625 | /* Now verify that the resulting address is valid for every integer or |
3626 | floating-point mode up to and including SIZE bytes long. We do this | |
3627 | since the object might be accessed in any mode and frame addresses | |
3628 | are shared. */ | |
3629 | ||
3630 | for (mode = GET_CLASS_NARROWEST_MODE (MODE_INT); | |
770ae6cc | 3631 | mode != VOIDmode && GET_MODE_SIZE (mode) <= decl_size; |
87ce34d6 JW |
3632 | mode = GET_MODE_WIDER_MODE (mode)) |
3633 | if (! memory_address_p (mode, addr)) | |
3634 | return; | |
5a73491b | 3635 | |
87ce34d6 | 3636 | for (mode = GET_CLASS_NARROWEST_MODE (MODE_FLOAT); |
770ae6cc | 3637 | mode != VOIDmode && GET_MODE_SIZE (mode) <= decl_size; |
87ce34d6 JW |
3638 | mode = GET_MODE_WIDER_MODE (mode)) |
3639 | if (! memory_address_p (mode, addr)) | |
3640 | return; | |
3641 | } | |
5a73491b | 3642 | |
87ce34d6 JW |
3643 | /* Put back the address now that we have updated it and we either know |
3644 | it is valid or we don't care whether it is valid. */ | |
5a73491b RK |
3645 | |
3646 | XEXP (x, 0) = addr; | |
3647 | } | |
6f086dfc RS |
3648 | \f |
3649 | /* Given a pointer to a piece of rtx and an optional pointer to the | |
3650 | containing object, instantiate any virtual registers present in it. | |
3651 | ||
3652 | If EXTRA_INSNS, we always do the replacement and generate | |
3653 | any extra insns before OBJECT. If it zero, we do nothing if replacement | |
3654 | is not valid. | |
3655 | ||
3656 | Return 1 if we either had nothing to do or if we were able to do the | |
718fe406 | 3657 | needed replacement. Return 0 otherwise; we only return zero if |
6f086dfc RS |
3658 | EXTRA_INSNS is zero. |
3659 | ||
3660 | We first try some simple transformations to avoid the creation of extra | |
3661 | pseudos. */ | |
3662 | ||
3663 | static int | |
3664 | instantiate_virtual_regs_1 (loc, object, extra_insns) | |
3665 | rtx *loc; | |
3666 | rtx object; | |
3667 | int extra_insns; | |
3668 | { | |
3669 | rtx x; | |
3670 | RTX_CODE code; | |
3671 | rtx new = 0; | |
07444f1d | 3672 | HOST_WIDE_INT offset = 0; |
6f086dfc RS |
3673 | rtx temp; |
3674 | rtx seq; | |
3675 | int i, j; | |
6f7d635c | 3676 | const char *fmt; |
6f086dfc RS |
3677 | |
3678 | /* Re-start here to avoid recursion in common cases. */ | |
3679 | restart: | |
3680 | ||
3681 | x = *loc; | |
3682 | if (x == 0) | |
3683 | return 1; | |
3684 | ||
3685 | code = GET_CODE (x); | |
3686 | ||
3687 | /* Check for some special cases. */ | |
3688 | switch (code) | |
3689 | { | |
3690 | case CONST_INT: | |
3691 | case CONST_DOUBLE: | |
3692 | case CONST: | |
3693 | case SYMBOL_REF: | |
3694 | case CODE_LABEL: | |
3695 | case PC: | |
3696 | case CC0: | |
3697 | case ASM_INPUT: | |
3698 | case ADDR_VEC: | |
3699 | case ADDR_DIFF_VEC: | |
3700 | case RETURN: | |
3701 | return 1; | |
3702 | ||
3703 | case SET: | |
3704 | /* We are allowed to set the virtual registers. This means that | |
38e01259 | 3705 | the actual register should receive the source minus the |
6f086dfc RS |
3706 | appropriate offset. This is used, for example, in the handling |
3707 | of non-local gotos. */ | |
3708 | if (SET_DEST (x) == virtual_incoming_args_rtx) | |
718fe406 | 3709 | new = arg_pointer_rtx, offset = -in_arg_offset; |
6f086dfc | 3710 | else if (SET_DEST (x) == virtual_stack_vars_rtx) |
718fe406 | 3711 | new = frame_pointer_rtx, offset = -var_offset; |
6f086dfc | 3712 | else if (SET_DEST (x) == virtual_stack_dynamic_rtx) |
718fe406 | 3713 | new = stack_pointer_rtx, offset = -dynamic_offset; |
6f086dfc | 3714 | else if (SET_DEST (x) == virtual_outgoing_args_rtx) |
718fe406 | 3715 | new = stack_pointer_rtx, offset = -out_arg_offset; |
71038426 | 3716 | else if (SET_DEST (x) == virtual_cfa_rtx) |
718fe406 | 3717 | new = arg_pointer_rtx, offset = -cfa_offset; |
6f086dfc RS |
3718 | |
3719 | if (new) | |
3720 | { | |
14a774a9 RK |
3721 | rtx src = SET_SRC (x); |
3722 | ||
3723 | instantiate_virtual_regs_1 (&src, NULL_RTX, 0); | |
3724 | ||
6f086dfc RS |
3725 | /* The only valid sources here are PLUS or REG. Just do |
3726 | the simplest possible thing to handle them. */ | |
14a774a9 | 3727 | if (GET_CODE (src) != REG && GET_CODE (src) != PLUS) |
6f086dfc RS |
3728 | abort (); |
3729 | ||
3730 | start_sequence (); | |
14a774a9 RK |
3731 | if (GET_CODE (src) != REG) |
3732 | temp = force_operand (src, NULL_RTX); | |
6f086dfc | 3733 | else |
14a774a9 | 3734 | temp = src; |
5f4f0e22 | 3735 | temp = force_operand (plus_constant (temp, offset), NULL_RTX); |
6f086dfc RS |
3736 | seq = get_insns (); |
3737 | end_sequence (); | |
3738 | ||
3739 | emit_insns_before (seq, object); | |
3740 | SET_DEST (x) = new; | |
3741 | ||
e9a25f70 | 3742 | if (! validate_change (object, &SET_SRC (x), temp, 0) |
6f086dfc RS |
3743 | || ! extra_insns) |
3744 | abort (); | |
3745 | ||
3746 | return 1; | |
3747 | } | |
3748 | ||
3749 | instantiate_virtual_regs_1 (&SET_DEST (x), object, extra_insns); | |
3750 | loc = &SET_SRC (x); | |
3751 | goto restart; | |
3752 | ||
3753 | case PLUS: | |
3754 | /* Handle special case of virtual register plus constant. */ | |
3755 | if (CONSTANT_P (XEXP (x, 1))) | |
3756 | { | |
b1f82ccf | 3757 | rtx old, new_offset; |
6f086dfc RS |
3758 | |
3759 | /* Check for (plus (plus VIRT foo) (const_int)) first. */ | |
3760 | if (GET_CODE (XEXP (x, 0)) == PLUS) | |
3761 | { | |
3762 | rtx inner = XEXP (XEXP (x, 0), 0); | |
3763 | ||
3764 | if (inner == virtual_incoming_args_rtx) | |
3765 | new = arg_pointer_rtx, offset = in_arg_offset; | |
3766 | else if (inner == virtual_stack_vars_rtx) | |
3767 | new = frame_pointer_rtx, offset = var_offset; | |
3768 | else if (inner == virtual_stack_dynamic_rtx) | |
3769 | new = stack_pointer_rtx, offset = dynamic_offset; | |
3770 | else if (inner == virtual_outgoing_args_rtx) | |
3771 | new = stack_pointer_rtx, offset = out_arg_offset; | |
71038426 | 3772 | else if (inner == virtual_cfa_rtx) |
718fe406 | 3773 | new = arg_pointer_rtx, offset = cfa_offset; |
6f086dfc RS |
3774 | else |
3775 | { | |
3776 | loc = &XEXP (x, 0); | |
3777 | goto restart; | |
3778 | } | |
3779 | ||
3780 | instantiate_virtual_regs_1 (&XEXP (XEXP (x, 0), 1), object, | |
3781 | extra_insns); | |
38a448ca | 3782 | new = gen_rtx_PLUS (Pmode, new, XEXP (XEXP (x, 0), 1)); |
6f086dfc RS |
3783 | } |
3784 | ||
3785 | else if (XEXP (x, 0) == virtual_incoming_args_rtx) | |
3786 | new = arg_pointer_rtx, offset = in_arg_offset; | |
3787 | else if (XEXP (x, 0) == virtual_stack_vars_rtx) | |
3788 | new = frame_pointer_rtx, offset = var_offset; | |
3789 | else if (XEXP (x, 0) == virtual_stack_dynamic_rtx) | |
3790 | new = stack_pointer_rtx, offset = dynamic_offset; | |
3791 | else if (XEXP (x, 0) == virtual_outgoing_args_rtx) | |
3792 | new = stack_pointer_rtx, offset = out_arg_offset; | |
718fe406 KH |
3793 | else if (XEXP (x, 0) == virtual_cfa_rtx) |
3794 | new = arg_pointer_rtx, offset = cfa_offset; | |
6f086dfc RS |
3795 | else |
3796 | { | |
3797 | /* We know the second operand is a constant. Unless the | |
3798 | first operand is a REG (which has been already checked), | |
3799 | it needs to be checked. */ | |
3800 | if (GET_CODE (XEXP (x, 0)) != REG) | |
3801 | { | |
3802 | loc = &XEXP (x, 0); | |
3803 | goto restart; | |
3804 | } | |
3805 | return 1; | |
3806 | } | |
3807 | ||
b1f82ccf | 3808 | new_offset = plus_constant (XEXP (x, 1), offset); |
6f086dfc | 3809 | |
b1f82ccf DE |
3810 | /* If the new constant is zero, try to replace the sum with just |
3811 | the register. */ | |
3812 | if (new_offset == const0_rtx | |
3813 | && validate_change (object, loc, new, 0)) | |
6f086dfc RS |
3814 | return 1; |
3815 | ||
b1f82ccf DE |
3816 | /* Next try to replace the register and new offset. |
3817 | There are two changes to validate here and we can't assume that | |
3818 | in the case of old offset equals new just changing the register | |
3819 | will yield a valid insn. In the interests of a little efficiency, | |
3820 | however, we only call validate change once (we don't queue up the | |
0f41302f | 3821 | changes and then call apply_change_group). */ |
b1f82ccf DE |
3822 | |
3823 | old = XEXP (x, 0); | |
3824 | if (offset == 0 | |
3825 | ? ! validate_change (object, &XEXP (x, 0), new, 0) | |
3826 | : (XEXP (x, 0) = new, | |
3827 | ! validate_change (object, &XEXP (x, 1), new_offset, 0))) | |
6f086dfc RS |
3828 | { |
3829 | if (! extra_insns) | |
3830 | { | |
3831 | XEXP (x, 0) = old; | |
3832 | return 0; | |
3833 | } | |
3834 | ||
3835 | /* Otherwise copy the new constant into a register and replace | |
3836 | constant with that register. */ | |
3837 | temp = gen_reg_rtx (Pmode); | |
b1f82ccf | 3838 | XEXP (x, 0) = new; |
6f086dfc | 3839 | if (validate_change (object, &XEXP (x, 1), temp, 0)) |
b1f82ccf | 3840 | emit_insn_before (gen_move_insn (temp, new_offset), object); |
6f086dfc RS |
3841 | else |
3842 | { | |
3843 | /* If that didn't work, replace this expression with a | |
3844 | register containing the sum. */ | |
3845 | ||
6f086dfc | 3846 | XEXP (x, 0) = old; |
38a448ca | 3847 | new = gen_rtx_PLUS (Pmode, new, new_offset); |
6f086dfc RS |
3848 | |
3849 | start_sequence (); | |
5f4f0e22 | 3850 | temp = force_operand (new, NULL_RTX); |
6f086dfc RS |
3851 | seq = get_insns (); |
3852 | end_sequence (); | |
3853 | ||
3854 | emit_insns_before (seq, object); | |
3855 | if (! validate_change (object, loc, temp, 0) | |
3856 | && ! validate_replace_rtx (x, temp, object)) | |
3857 | abort (); | |
3858 | } | |
3859 | } | |
3860 | ||
3861 | return 1; | |
3862 | } | |
3863 | ||
3864 | /* Fall through to generic two-operand expression case. */ | |
3865 | case EXPR_LIST: | |
3866 | case CALL: | |
3867 | case COMPARE: | |
3868 | case MINUS: | |
3869 | case MULT: | |
3870 | case DIV: case UDIV: | |
3871 | case MOD: case UMOD: | |
3872 | case AND: case IOR: case XOR: | |
45620ed4 RK |
3873 | case ROTATERT: case ROTATE: |
3874 | case ASHIFTRT: case LSHIFTRT: case ASHIFT: | |
6f086dfc RS |
3875 | case NE: case EQ: |
3876 | case GE: case GT: case GEU: case GTU: | |
3877 | case LE: case LT: case LEU: case LTU: | |
3878 | if (XEXP (x, 1) && ! CONSTANT_P (XEXP (x, 1))) | |
3879 | instantiate_virtual_regs_1 (&XEXP (x, 1), object, extra_insns); | |
3880 | loc = &XEXP (x, 0); | |
3881 | goto restart; | |
3882 | ||
3883 | case MEM: | |
3884 | /* Most cases of MEM that convert to valid addresses have already been | |
4fd796bb | 3885 | handled by our scan of decls. The only special handling we |
6f086dfc | 3886 | need here is to make a copy of the rtx to ensure it isn't being |
718fe406 | 3887 | shared if we have to change it to a pseudo. |
6f086dfc RS |
3888 | |
3889 | If the rtx is a simple reference to an address via a virtual register, | |
3890 | it can potentially be shared. In such cases, first try to make it | |
3891 | a valid address, which can also be shared. Otherwise, copy it and | |
718fe406 | 3892 | proceed normally. |
6f086dfc RS |
3893 | |
3894 | First check for common cases that need no processing. These are | |
3895 | usually due to instantiation already being done on a previous instance | |
3896 | of a shared rtx. */ | |
3897 | ||
3898 | temp = XEXP (x, 0); | |
3899 | if (CONSTANT_ADDRESS_P (temp) | |
3900 | #if FRAME_POINTER_REGNUM != ARG_POINTER_REGNUM | |
3901 | || temp == arg_pointer_rtx | |
b37f453b DE |
3902 | #endif |
3903 | #if HARD_FRAME_POINTER_REGNUM != FRAME_POINTER_REGNUM | |
3904 | || temp == hard_frame_pointer_rtx | |
6f086dfc RS |
3905 | #endif |
3906 | || temp == frame_pointer_rtx) | |
3907 | return 1; | |
3908 | ||
3909 | if (GET_CODE (temp) == PLUS | |
3910 | && CONSTANT_ADDRESS_P (XEXP (temp, 1)) | |
3911 | && (XEXP (temp, 0) == frame_pointer_rtx | |
b37f453b DE |
3912 | #if HARD_FRAME_POINTER_REGNUM != FRAME_POINTER_REGNUM |
3913 | || XEXP (temp, 0) == hard_frame_pointer_rtx | |
3914 | #endif | |
6f086dfc RS |
3915 | #if FRAME_POINTER_REGNUM != ARG_POINTER_REGNUM |
3916 | || XEXP (temp, 0) == arg_pointer_rtx | |
3917 | #endif | |
3918 | )) | |
3919 | return 1; | |
3920 | ||
3921 | if (temp == virtual_stack_vars_rtx | |
3922 | || temp == virtual_incoming_args_rtx | |
3923 | || (GET_CODE (temp) == PLUS | |
3924 | && CONSTANT_ADDRESS_P (XEXP (temp, 1)) | |
3925 | && (XEXP (temp, 0) == virtual_stack_vars_rtx | |
3926 | || XEXP (temp, 0) == virtual_incoming_args_rtx))) | |
3927 | { | |
3928 | /* This MEM may be shared. If the substitution can be done without | |
3929 | the need to generate new pseudos, we want to do it in place | |
3930 | so all copies of the shared rtx benefit. The call below will | |
3931 | only make substitutions if the resulting address is still | |
3932 | valid. | |
3933 | ||
3934 | Note that we cannot pass X as the object in the recursive call | |
3935 | since the insn being processed may not allow all valid | |
6461be14 RS |
3936 | addresses. However, if we were not passed on object, we can |
3937 | only modify X without copying it if X will have a valid | |
3938 | address. | |
6f086dfc | 3939 | |
6461be14 RS |
3940 | ??? Also note that this can still lose if OBJECT is an insn that |
3941 | has less restrictions on an address that some other insn. | |
3942 | In that case, we will modify the shared address. This case | |
4fd796bb RK |
3943 | doesn't seem very likely, though. One case where this could |
3944 | happen is in the case of a USE or CLOBBER reference, but we | |
3945 | take care of that below. */ | |
6461be14 RS |
3946 | |
3947 | if (instantiate_virtual_regs_1 (&XEXP (x, 0), | |
3948 | object ? object : x, 0)) | |
6f086dfc RS |
3949 | return 1; |
3950 | ||
3951 | /* Otherwise make a copy and process that copy. We copy the entire | |
3952 | RTL expression since it might be a PLUS which could also be | |
3953 | shared. */ | |
3954 | *loc = x = copy_rtx (x); | |
3955 | } | |
3956 | ||
3957 | /* Fall through to generic unary operation case. */ | |
6f086dfc RS |
3958 | case SUBREG: |
3959 | case STRICT_LOW_PART: | |
3960 | case NEG: case NOT: | |
3961 | case PRE_DEC: case PRE_INC: case POST_DEC: case POST_INC: | |
3962 | case SIGN_EXTEND: case ZERO_EXTEND: | |
3963 | case TRUNCATE: case FLOAT_EXTEND: case FLOAT_TRUNCATE: | |
3964 | case FLOAT: case FIX: | |
3965 | case UNSIGNED_FIX: case UNSIGNED_FLOAT: | |
3966 | case ABS: | |
3967 | case SQRT: | |
3968 | case FFS: | |
3969 | /* These case either have just one operand or we know that we need not | |
3970 | check the rest of the operands. */ | |
3971 | loc = &XEXP (x, 0); | |
3972 | goto restart; | |
3973 | ||
4fd796bb RK |
3974 | case USE: |
3975 | case CLOBBER: | |
3976 | /* If the operand is a MEM, see if the change is a valid MEM. If not, | |
3977 | go ahead and make the invalid one, but do it to a copy. For a REG, | |
718fe406 | 3978 | just make the recursive call, since there's no chance of a problem. */ |
4fd796bb RK |
3979 | |
3980 | if ((GET_CODE (XEXP (x, 0)) == MEM | |
3981 | && instantiate_virtual_regs_1 (&XEXP (XEXP (x, 0), 0), XEXP (x, 0), | |
3982 | 0)) | |
3983 | || (GET_CODE (XEXP (x, 0)) == REG | |
7694ce35 | 3984 | && instantiate_virtual_regs_1 (&XEXP (x, 0), object, 0))) |
4fd796bb RK |
3985 | return 1; |
3986 | ||
3987 | XEXP (x, 0) = copy_rtx (XEXP (x, 0)); | |
3988 | loc = &XEXP (x, 0); | |
3989 | goto restart; | |
3990 | ||
6f086dfc RS |
3991 | case REG: |
3992 | /* Try to replace with a PLUS. If that doesn't work, compute the sum | |
3993 | in front of this insn and substitute the temporary. */ | |
3994 | if (x == virtual_incoming_args_rtx) | |
3995 | new = arg_pointer_rtx, offset = in_arg_offset; | |
3996 | else if (x == virtual_stack_vars_rtx) | |
3997 | new = frame_pointer_rtx, offset = var_offset; | |
3998 | else if (x == virtual_stack_dynamic_rtx) | |
3999 | new = stack_pointer_rtx, offset = dynamic_offset; | |
4000 | else if (x == virtual_outgoing_args_rtx) | |
4001 | new = stack_pointer_rtx, offset = out_arg_offset; | |
71038426 | 4002 | else if (x == virtual_cfa_rtx) |
718fe406 | 4003 | new = arg_pointer_rtx, offset = cfa_offset; |
6f086dfc RS |
4004 | |
4005 | if (new) | |
4006 | { | |
4007 | temp = plus_constant (new, offset); | |
4008 | if (!validate_change (object, loc, temp, 0)) | |
4009 | { | |
4010 | if (! extra_insns) | |
4011 | return 0; | |
4012 | ||
4013 | start_sequence (); | |
5f4f0e22 | 4014 | temp = force_operand (temp, NULL_RTX); |
6f086dfc RS |
4015 | seq = get_insns (); |
4016 | end_sequence (); | |
4017 | ||
4018 | emit_insns_before (seq, object); | |
4019 | if (! validate_change (object, loc, temp, 0) | |
4020 | && ! validate_replace_rtx (x, temp, object)) | |
4021 | abort (); | |
4022 | } | |
4023 | } | |
4024 | ||
4025 | return 1; | |
e9a25f70 JL |
4026 | |
4027 | case ADDRESSOF: | |
4028 | if (GET_CODE (XEXP (x, 0)) == REG) | |
4029 | return 1; | |
4030 | ||
4031 | else if (GET_CODE (XEXP (x, 0)) == MEM) | |
4032 | { | |
4033 | /* If we have a (addressof (mem ..)), do any instantiation inside | |
4034 | since we know we'll be making the inside valid when we finally | |
4035 | remove the ADDRESSOF. */ | |
4036 | instantiate_virtual_regs_1 (&XEXP (XEXP (x, 0), 0), NULL_RTX, 0); | |
4037 | return 1; | |
4038 | } | |
4039 | break; | |
718fe406 | 4040 | |
e9a25f70 JL |
4041 | default: |
4042 | break; | |
6f086dfc RS |
4043 | } |
4044 | ||
4045 | /* Scan all subexpressions. */ | |
4046 | fmt = GET_RTX_FORMAT (code); | |
4047 | for (i = 0; i < GET_RTX_LENGTH (code); i++, fmt++) | |
4048 | if (*fmt == 'e') | |
4049 | { | |
4050 | if (!instantiate_virtual_regs_1 (&XEXP (x, i), object, extra_insns)) | |
4051 | return 0; | |
4052 | } | |
4053 | else if (*fmt == 'E') | |
4054 | for (j = 0; j < XVECLEN (x, i); j++) | |
4055 | if (! instantiate_virtual_regs_1 (&XVECEXP (x, i, j), object, | |
4056 | extra_insns)) | |
4057 | return 0; | |
4058 | ||
4059 | return 1; | |
4060 | } | |
4061 | \f | |
4062 | /* Optimization: assuming this function does not receive nonlocal gotos, | |
4063 | delete the handlers for such, as well as the insns to establish | |
4064 | and disestablish them. */ | |
4065 | ||
4066 | static void | |
4067 | delete_handlers () | |
4068 | { | |
4069 | rtx insn; | |
4070 | for (insn = get_insns (); insn; insn = NEXT_INSN (insn)) | |
4071 | { | |
4072 | /* Delete the handler by turning off the flag that would | |
4073 | prevent jump_optimize from deleting it. | |
4074 | Also permit deletion of the nonlocal labels themselves | |
4075 | if nothing local refers to them. */ | |
4076 | if (GET_CODE (insn) == CODE_LABEL) | |
71cd4a8d JW |
4077 | { |
4078 | tree t, last_t; | |
4079 | ||
4080 | LABEL_PRESERVE_P (insn) = 0; | |
4081 | ||
4082 | /* Remove it from the nonlocal_label list, to avoid confusing | |
4083 | flow. */ | |
4084 | for (t = nonlocal_labels, last_t = 0; t; | |
4085 | last_t = t, t = TREE_CHAIN (t)) | |
4086 | if (DECL_RTL (TREE_VALUE (t)) == insn) | |
4087 | break; | |
4088 | if (t) | |
4089 | { | |
4090 | if (! last_t) | |
4091 | nonlocal_labels = TREE_CHAIN (nonlocal_labels); | |
4092 | else | |
4093 | TREE_CHAIN (last_t) = TREE_CHAIN (t); | |
4094 | } | |
4095 | } | |
ba716ac9 BS |
4096 | if (GET_CODE (insn) == INSN) |
4097 | { | |
4098 | int can_delete = 0; | |
4099 | rtx t; | |
4100 | for (t = nonlocal_goto_handler_slots; t != 0; t = XEXP (t, 1)) | |
4101 | if (reg_mentioned_p (t, PATTERN (insn))) | |
4102 | { | |
4103 | can_delete = 1; | |
4104 | break; | |
4105 | } | |
4106 | if (can_delete | |
59257ff7 RK |
4107 | || (nonlocal_goto_stack_level != 0 |
4108 | && reg_mentioned_p (nonlocal_goto_stack_level, | |
ba716ac9 BS |
4109 | PATTERN (insn)))) |
4110 | delete_insn (insn); | |
4111 | } | |
6f086dfc RS |
4112 | } |
4113 | } | |
6f086dfc | 4114 | \f |
6f086dfc RS |
4115 | int |
4116 | max_parm_reg_num () | |
4117 | { | |
4118 | return max_parm_reg; | |
4119 | } | |
4120 | ||
4121 | /* Return the first insn following those generated by `assign_parms'. */ | |
4122 | ||
4123 | rtx | |
4124 | get_first_nonparm_insn () | |
4125 | { | |
4126 | if (last_parm_insn) | |
4127 | return NEXT_INSN (last_parm_insn); | |
4128 | return get_insns (); | |
4129 | } | |
4130 | ||
5378192b RS |
4131 | /* Return the first NOTE_INSN_BLOCK_BEG note in the function. |
4132 | Crash if there is none. */ | |
4133 | ||
4134 | rtx | |
4135 | get_first_block_beg () | |
4136 | { | |
4137 | register rtx searcher; | |
4138 | register rtx insn = get_first_nonparm_insn (); | |
4139 | ||
4140 | for (searcher = insn; searcher; searcher = NEXT_INSN (searcher)) | |
4141 | if (GET_CODE (searcher) == NOTE | |
4142 | && NOTE_LINE_NUMBER (searcher) == NOTE_INSN_BLOCK_BEG) | |
4143 | return searcher; | |
4144 | ||
4145 | abort (); /* Invalid call to this function. (See comments above.) */ | |
4146 | return NULL_RTX; | |
4147 | } | |
4148 | ||
d181c154 RS |
4149 | /* Return 1 if EXP is an aggregate type (or a value with aggregate type). |
4150 | This means a type for which function calls must pass an address to the | |
4151 | function or get an address back from the function. | |
4152 | EXP may be a type node or an expression (whose type is tested). */ | |
6f086dfc RS |
4153 | |
4154 | int | |
4155 | aggregate_value_p (exp) | |
4156 | tree exp; | |
4157 | { | |
9d790a4f RS |
4158 | int i, regno, nregs; |
4159 | rtx reg; | |
2f939d94 TP |
4160 | |
4161 | tree type = (TYPE_P (exp)) ? exp : TREE_TYPE (exp); | |
d181c154 | 4162 | |
d7bf8ada MM |
4163 | if (TREE_CODE (type) == VOID_TYPE) |
4164 | return 0; | |
d181c154 | 4165 | if (RETURN_IN_MEMORY (type)) |
6f086dfc | 4166 | return 1; |
956d6950 | 4167 | /* Types that are TREE_ADDRESSABLE must be constructed in memory, |
49a2e5b2 DE |
4168 | and thus can't be returned in registers. */ |
4169 | if (TREE_ADDRESSABLE (type)) | |
4170 | return 1; | |
05e3bdb9 | 4171 | if (flag_pcc_struct_return && AGGREGATE_TYPE_P (type)) |
6f086dfc | 4172 | return 1; |
9d790a4f RS |
4173 | /* Make sure we have suitable call-clobbered regs to return |
4174 | the value in; if not, we must return it in memory. */ | |
4dc07bd7 | 4175 | reg = hard_function_value (type, 0, 0); |
e71f7aa5 JW |
4176 | |
4177 | /* If we have something other than a REG (e.g. a PARALLEL), then assume | |
4178 | it is OK. */ | |
4179 | if (GET_CODE (reg) != REG) | |
4180 | return 0; | |
4181 | ||
9d790a4f | 4182 | regno = REGNO (reg); |
d181c154 | 4183 | nregs = HARD_REGNO_NREGS (regno, TYPE_MODE (type)); |
9d790a4f RS |
4184 | for (i = 0; i < nregs; i++) |
4185 | if (! call_used_regs[regno + i]) | |
4186 | return 1; | |
6f086dfc RS |
4187 | return 0; |
4188 | } | |
4189 | \f | |
4190 | /* Assign RTL expressions to the function's parameters. | |
4191 | This may involve copying them into registers and using | |
0d1416c6 | 4192 | those registers as the RTL for them. */ |
6f086dfc RS |
4193 | |
4194 | void | |
0d1416c6 | 4195 | assign_parms (fndecl) |
6f086dfc | 4196 | tree fndecl; |
6f086dfc RS |
4197 | { |
4198 | register tree parm; | |
4199 | register rtx entry_parm = 0; | |
4200 | register rtx stack_parm = 0; | |
4201 | CUMULATIVE_ARGS args_so_far; | |
621061f4 RK |
4202 | enum machine_mode promoted_mode, passed_mode; |
4203 | enum machine_mode nominal_mode, promoted_nominal_mode; | |
00d8a4c1 | 4204 | int unsignedp; |
6f086dfc RS |
4205 | /* Total space needed so far for args on the stack, |
4206 | given as a constant and a tree-expression. */ | |
4207 | struct args_size stack_args_size; | |
4208 | tree fntype = TREE_TYPE (fndecl); | |
4209 | tree fnargs = DECL_ARGUMENTS (fndecl); | |
4210 | /* This is used for the arg pointer when referring to stack args. */ | |
4211 | rtx internal_arg_pointer; | |
718fe406 | 4212 | /* This is a dummy PARM_DECL that we used for the function result if |
6f086dfc RS |
4213 | the function returns a structure. */ |
4214 | tree function_result_decl = 0; | |
54ea1de9 | 4215 | #ifdef SETUP_INCOMING_VARARGS |
6f086dfc | 4216 | int varargs_setup = 0; |
54ea1de9 | 4217 | #endif |
3412b298 | 4218 | rtx conversion_insns = 0; |
4fc026cd | 4219 | struct args_size alignment_pad; |
6f086dfc RS |
4220 | |
4221 | /* Nonzero if the last arg is named `__builtin_va_alist', | |
4222 | which is used on some machines for old-fashioned non-ANSI varargs.h; | |
4223 | this should be stuck onto the stack as if it had arrived there. */ | |
3b69d50e RK |
4224 | int hide_last_arg |
4225 | = (current_function_varargs | |
4226 | && fnargs | |
6f086dfc RS |
4227 | && (parm = tree_last (fnargs)) != 0 |
4228 | && DECL_NAME (parm) | |
4229 | && (! strcmp (IDENTIFIER_POINTER (DECL_NAME (parm)), | |
4230 | "__builtin_va_alist"))); | |
4231 | ||
4232 | /* Nonzero if function takes extra anonymous args. | |
4233 | This means the last named arg must be on the stack | |
0f41302f | 4234 | right before the anonymous ones. */ |
6f086dfc RS |
4235 | int stdarg |
4236 | = (TYPE_ARG_TYPES (fntype) != 0 | |
4237 | && (TREE_VALUE (tree_last (TYPE_ARG_TYPES (fntype))) | |
4238 | != void_type_node)); | |
4239 | ||
ebb904cb RK |
4240 | current_function_stdarg = stdarg; |
4241 | ||
6f086dfc RS |
4242 | /* If the reg that the virtual arg pointer will be translated into is |
4243 | not a fixed reg or is the stack pointer, make a copy of the virtual | |
4244 | arg pointer, and address parms via the copy. The frame pointer is | |
4245 | considered fixed even though it is not marked as such. | |
4246 | ||
4247 | The second time through, simply use ap to avoid generating rtx. */ | |
4248 | ||
4249 | if ((ARG_POINTER_REGNUM == STACK_POINTER_REGNUM | |
4250 | || ! (fixed_regs[ARG_POINTER_REGNUM] | |
0d1416c6 | 4251 | || ARG_POINTER_REGNUM == FRAME_POINTER_REGNUM))) |
6f086dfc RS |
4252 | internal_arg_pointer = copy_to_reg (virtual_incoming_args_rtx); |
4253 | else | |
4254 | internal_arg_pointer = virtual_incoming_args_rtx; | |
4255 | current_function_internal_arg_pointer = internal_arg_pointer; | |
4256 | ||
4257 | stack_args_size.constant = 0; | |
4258 | stack_args_size.var = 0; | |
4259 | ||
4260 | /* If struct value address is treated as the first argument, make it so. */ | |
4261 | if (aggregate_value_p (DECL_RESULT (fndecl)) | |
4262 | && ! current_function_returns_pcc_struct | |
4263 | && struct_value_incoming_rtx == 0) | |
4264 | { | |
f9f29478 | 4265 | tree type = build_pointer_type (TREE_TYPE (fntype)); |
6f086dfc | 4266 | |
5f4f0e22 | 4267 | function_result_decl = build_decl (PARM_DECL, NULL_TREE, type); |
6f086dfc RS |
4268 | |
4269 | DECL_ARG_TYPE (function_result_decl) = type; | |
4270 | TREE_CHAIN (function_result_decl) = fnargs; | |
4271 | fnargs = function_result_decl; | |
4272 | } | |
718fe406 | 4273 | |
e9a25f70 | 4274 | max_parm_reg = LAST_VIRTUAL_REGISTER + 1; |
e2ecd91c | 4275 | parm_reg_stack_loc = (rtx *) xcalloc (max_parm_reg, sizeof (rtx)); |
6f086dfc RS |
4276 | |
4277 | #ifdef INIT_CUMULATIVE_INCOMING_ARGS | |
ea0d4c4b | 4278 | INIT_CUMULATIVE_INCOMING_ARGS (args_so_far, fntype, NULL_RTX); |
6f086dfc | 4279 | #else |
2c7ee1a6 | 4280 | INIT_CUMULATIVE_ARGS (args_so_far, fntype, NULL_RTX, 0); |
6f086dfc RS |
4281 | #endif |
4282 | ||
4283 | /* We haven't yet found an argument that we must push and pretend the | |
4284 | caller did. */ | |
4285 | current_function_pretend_args_size = 0; | |
4286 | ||
4287 | for (parm = fnargs; parm; parm = TREE_CHAIN (parm)) | |
4288 | { | |
6f086dfc RS |
4289 | struct args_size stack_offset; |
4290 | struct args_size arg_size; | |
4291 | int passed_pointer = 0; | |
621061f4 | 4292 | int did_conversion = 0; |
6f086dfc | 4293 | tree passed_type = DECL_ARG_TYPE (parm); |
621061f4 | 4294 | tree nominal_type = TREE_TYPE (parm); |
9ab70a9b | 4295 | int pretend_named; |
6f086dfc RS |
4296 | |
4297 | /* Set LAST_NAMED if this is last named arg before some | |
bf9c83fe | 4298 | anonymous args. */ |
6f086dfc RS |
4299 | int last_named = ((TREE_CHAIN (parm) == 0 |
4300 | || DECL_NAME (TREE_CHAIN (parm)) == 0) | |
3b69d50e | 4301 | && (stdarg || current_function_varargs)); |
bf9c83fe JW |
4302 | /* Set NAMED_ARG if this arg should be treated as a named arg. For |
4303 | most machines, if this is a varargs/stdarg function, then we treat | |
4304 | the last named arg as if it were anonymous too. */ | |
e5e809f4 | 4305 | int named_arg = STRICT_ARGUMENT_NAMING ? 1 : ! last_named; |
6f086dfc RS |
4306 | |
4307 | if (TREE_TYPE (parm) == error_mark_node | |
4308 | /* This can happen after weird syntax errors | |
4309 | or if an enum type is defined among the parms. */ | |
4310 | || TREE_CODE (parm) != PARM_DECL | |
4311 | || passed_type == NULL) | |
4312 | { | |
38a448ca RH |
4313 | DECL_INCOMING_RTL (parm) = DECL_RTL (parm) |
4314 | = gen_rtx_MEM (BLKmode, const0_rtx); | |
6f086dfc RS |
4315 | TREE_USED (parm) = 1; |
4316 | continue; | |
4317 | } | |
4318 | ||
4319 | /* For varargs.h function, save info about regs and stack space | |
4320 | used by the individual args, not including the va_alist arg. */ | |
3b69d50e | 4321 | if (hide_last_arg && last_named) |
6f086dfc RS |
4322 | current_function_args_info = args_so_far; |
4323 | ||
4324 | /* Find mode of arg as it is passed, and mode of arg | |
4325 | as it should be during execution of this function. */ | |
4326 | passed_mode = TYPE_MODE (passed_type); | |
621061f4 | 4327 | nominal_mode = TYPE_MODE (nominal_type); |
6f086dfc | 4328 | |
16bae307 RS |
4329 | /* If the parm's mode is VOID, its value doesn't matter, |
4330 | and avoid the usual things like emit_move_insn that could crash. */ | |
4331 | if (nominal_mode == VOIDmode) | |
4332 | { | |
4333 | DECL_INCOMING_RTL (parm) = DECL_RTL (parm) = const0_rtx; | |
4334 | continue; | |
4335 | } | |
4336 | ||
3f46679a RK |
4337 | /* If the parm is to be passed as a transparent union, use the |
4338 | type of the first field for the tests below. We have already | |
4339 | verified that the modes are the same. */ | |
4340 | if (DECL_TRANSPARENT_UNION (parm) | |
2bf105ab RK |
4341 | || (TREE_CODE (passed_type) == UNION_TYPE |
4342 | && TYPE_TRANSPARENT_UNION (passed_type))) | |
3f46679a RK |
4343 | passed_type = TREE_TYPE (TYPE_FIELDS (passed_type)); |
4344 | ||
a14ae508 RK |
4345 | /* See if this arg was passed by invisible reference. It is if |
4346 | it is an object whose size depends on the contents of the | |
4347 | object itself or if the machine requires these objects be passed | |
4348 | that way. */ | |
4349 | ||
4350 | if ((TREE_CODE (TYPE_SIZE (passed_type)) != INTEGER_CST | |
4351 | && contains_placeholder_p (TYPE_SIZE (passed_type))) | |
657bb6dc | 4352 | || TREE_ADDRESSABLE (passed_type) |
6f086dfc | 4353 | #ifdef FUNCTION_ARG_PASS_BY_REFERENCE |
a14ae508 | 4354 | || FUNCTION_ARG_PASS_BY_REFERENCE (args_so_far, passed_mode, |
bf9c83fe | 4355 | passed_type, named_arg) |
a14ae508 RK |
4356 | #endif |
4357 | ) | |
6f086dfc | 4358 | { |
621061f4 | 4359 | passed_type = nominal_type = build_pointer_type (passed_type); |
6f086dfc RS |
4360 | passed_pointer = 1; |
4361 | passed_mode = nominal_mode = Pmode; | |
4362 | } | |
6f086dfc | 4363 | |
a53e14c0 RK |
4364 | promoted_mode = passed_mode; |
4365 | ||
4366 | #ifdef PROMOTE_FUNCTION_ARGS | |
4367 | /* Compute the mode in which the arg is actually extended to. */ | |
7940255d | 4368 | unsignedp = TREE_UNSIGNED (passed_type); |
a5a52dbc | 4369 | promoted_mode = promote_mode (passed_type, promoted_mode, &unsignedp, 1); |
a53e14c0 RK |
4370 | #endif |
4371 | ||
6f086dfc RS |
4372 | /* Let machine desc say which reg (if any) the parm arrives in. |
4373 | 0 means it arrives on the stack. */ | |
4374 | #ifdef FUNCTION_INCOMING_ARG | |
a53e14c0 | 4375 | entry_parm = FUNCTION_INCOMING_ARG (args_so_far, promoted_mode, |
bf9c83fe | 4376 | passed_type, named_arg); |
6f086dfc | 4377 | #else |
a53e14c0 | 4378 | entry_parm = FUNCTION_ARG (args_so_far, promoted_mode, |
bf9c83fe | 4379 | passed_type, named_arg); |
6f086dfc RS |
4380 | #endif |
4381 | ||
621061f4 RK |
4382 | if (entry_parm == 0) |
4383 | promoted_mode = passed_mode; | |
a53e14c0 | 4384 | |
6f086dfc RS |
4385 | #ifdef SETUP_INCOMING_VARARGS |
4386 | /* If this is the last named parameter, do any required setup for | |
4387 | varargs or stdargs. We need to know about the case of this being an | |
4388 | addressable type, in which case we skip the registers it | |
4389 | would have arrived in. | |
4390 | ||
4391 | For stdargs, LAST_NAMED will be set for two parameters, the one that | |
4392 | is actually the last named, and the dummy parameter. We only | |
4393 | want to do this action once. | |
4394 | ||
4395 | Also, indicate when RTL generation is to be suppressed. */ | |
4396 | if (last_named && !varargs_setup) | |
4397 | { | |
621061f4 | 4398 | SETUP_INCOMING_VARARGS (args_so_far, promoted_mode, passed_type, |
0d1416c6 | 4399 | current_function_pretend_args_size, 0); |
6f086dfc RS |
4400 | varargs_setup = 1; |
4401 | } | |
4402 | #endif | |
4403 | ||
4404 | /* Determine parm's home in the stack, | |
4405 | in case it arrives in the stack or we should pretend it did. | |
4406 | ||
4407 | Compute the stack position and rtx where the argument arrives | |
4408 | and its size. | |
4409 | ||
4410 | There is one complexity here: If this was a parameter that would | |
4411 | have been passed in registers, but wasn't only because it is | |
4412 | __builtin_va_alist, we want locate_and_pad_parm to treat it as if | |
4413 | it came in a register so that REG_PARM_STACK_SPACE isn't skipped. | |
4414 | In this case, we call FUNCTION_ARG with NAMED set to 1 instead of | |
4415 | 0 as it was the previous time. */ | |
4416 | ||
9ab70a9b | 4417 | pretend_named = named_arg || PRETEND_OUTGOING_VARARGS_NAMED; |
0f11903b | 4418 | locate_and_pad_parm (promoted_mode, passed_type, |
6f086dfc RS |
4419 | #ifdef STACK_PARMS_IN_REG_PARM_AREA |
4420 | 1, | |
4421 | #else | |
4422 | #ifdef FUNCTION_INCOMING_ARG | |
621061f4 | 4423 | FUNCTION_INCOMING_ARG (args_so_far, promoted_mode, |
6f086dfc | 4424 | passed_type, |
9ab70a9b | 4425 | pretend_named) != 0, |
6f086dfc | 4426 | #else |
621061f4 | 4427 | FUNCTION_ARG (args_so_far, promoted_mode, |
6f086dfc | 4428 | passed_type, |
9ab70a9b | 4429 | pretend_named) != 0, |
6f086dfc RS |
4430 | #endif |
4431 | #endif | |
4fc026cd | 4432 | fndecl, &stack_args_size, &stack_offset, &arg_size, |
718fe406 | 4433 | &alignment_pad); |
6f086dfc | 4434 | |
0d1416c6 BS |
4435 | { |
4436 | rtx offset_rtx = ARGS_SIZE_RTX (stack_offset); | |
4437 | ||
4438 | if (offset_rtx == const0_rtx) | |
4439 | stack_parm = gen_rtx_MEM (promoted_mode, internal_arg_pointer); | |
4440 | else | |
4441 | stack_parm = gen_rtx_MEM (promoted_mode, | |
4442 | gen_rtx_PLUS (Pmode, | |
4443 | internal_arg_pointer, | |
4444 | offset_rtx)); | |
4445 | ||
3bdf5ad1 | 4446 | set_mem_attributes (stack_parm, parm, 1); |
0d1416c6 | 4447 | } |
6f086dfc RS |
4448 | |
4449 | /* If this parameter was passed both in registers and in the stack, | |
4450 | use the copy on the stack. */ | |
621061f4 | 4451 | if (MUST_PASS_IN_STACK (promoted_mode, passed_type)) |
6f086dfc RS |
4452 | entry_parm = 0; |
4453 | ||
461beb10 | 4454 | #ifdef FUNCTION_ARG_PARTIAL_NREGS |
6f086dfc RS |
4455 | /* If this parm was passed part in regs and part in memory, |
4456 | pretend it arrived entirely in memory | |
4457 | by pushing the register-part onto the stack. | |
4458 | ||
4459 | In the special case of a DImode or DFmode that is split, | |
4460 | we could put it together in a pseudoreg directly, | |
4461 | but for now that's not worth bothering with. */ | |
4462 | ||
4463 | if (entry_parm) | |
4464 | { | |
621061f4 | 4465 | int nregs = FUNCTION_ARG_PARTIAL_NREGS (args_so_far, promoted_mode, |
bf9c83fe | 4466 | passed_type, named_arg); |
6f086dfc RS |
4467 | |
4468 | if (nregs > 0) | |
4469 | { | |
4470 | current_function_pretend_args_size | |
4471 | = (((nregs * UNITS_PER_WORD) + (PARM_BOUNDARY / BITS_PER_UNIT) - 1) | |
4472 | / (PARM_BOUNDARY / BITS_PER_UNIT) | |
4473 | * (PARM_BOUNDARY / BITS_PER_UNIT)); | |
4474 | ||
0d1416c6 BS |
4475 | /* Handle calls that pass values in multiple non-contiguous |
4476 | locations. The Irix 6 ABI has examples of this. */ | |
4477 | if (GET_CODE (entry_parm) == PARALLEL) | |
4478 | emit_group_store (validize_mem (stack_parm), entry_parm, | |
4479 | int_size_in_bytes (TREE_TYPE (parm)), | |
19caa751 | 4480 | TYPE_ALIGN (TREE_TYPE (parm))); |
718fe406 | 4481 | |
0d1416c6 BS |
4482 | else |
4483 | move_block_from_reg (REGNO (entry_parm), | |
4484 | validize_mem (stack_parm), nregs, | |
4485 | int_size_in_bytes (TREE_TYPE (parm))); | |
4486 | ||
6f086dfc RS |
4487 | entry_parm = stack_parm; |
4488 | } | |
4489 | } | |
461beb10 | 4490 | #endif |
6f086dfc RS |
4491 | |
4492 | /* If we didn't decide this parm came in a register, | |
4493 | by default it came on the stack. */ | |
4494 | if (entry_parm == 0) | |
4495 | entry_parm = stack_parm; | |
4496 | ||
4497 | /* Record permanently how this parm was passed. */ | |
0d1416c6 | 4498 | DECL_INCOMING_RTL (parm) = entry_parm; |
6f086dfc RS |
4499 | |
4500 | /* If there is actually space on the stack for this parm, | |
4501 | count it in stack_args_size; otherwise set stack_parm to 0 | |
4502 | to indicate there is no preallocated stack slot for the parm. */ | |
4503 | ||
4504 | if (entry_parm == stack_parm | |
ab87f8c8 JL |
4505 | || (GET_CODE (entry_parm) == PARALLEL |
4506 | && XEXP (XVECEXP (entry_parm, 0, 0), 0) == NULL_RTX) | |
d9ca49d5 | 4507 | #if defined (REG_PARM_STACK_SPACE) && ! defined (MAYBE_REG_PARM_STACK_SPACE) |
6f086dfc | 4508 | /* On some machines, even if a parm value arrives in a register |
d9ca49d5 JW |
4509 | there is still an (uninitialized) stack slot allocated for it. |
4510 | ||
4511 | ??? When MAYBE_REG_PARM_STACK_SPACE is defined, we can't tell | |
4512 | whether this parameter already has a stack slot allocated, | |
4513 | because an arg block exists only if current_function_args_size | |
abc95ed3 | 4514 | is larger than some threshold, and we haven't calculated that |
d9ca49d5 JW |
4515 | yet. So, for now, we just assume that stack slots never exist |
4516 | in this case. */ | |
6f086dfc RS |
4517 | || REG_PARM_STACK_SPACE (fndecl) > 0 |
4518 | #endif | |
4519 | ) | |
4520 | { | |
4521 | stack_args_size.constant += arg_size.constant; | |
4522 | if (arg_size.var) | |
4523 | ADD_PARM_SIZE (stack_args_size, arg_size.var); | |
4524 | } | |
4525 | else | |
4526 | /* No stack slot was pushed for this parm. */ | |
4527 | stack_parm = 0; | |
4528 | ||
4529 | /* Update info on where next arg arrives in registers. */ | |
4530 | ||
621061f4 | 4531 | FUNCTION_ARG_ADVANCE (args_so_far, promoted_mode, |
bf9c83fe | 4532 | passed_type, named_arg); |
6f086dfc | 4533 | |
e16c591a RS |
4534 | /* If we can't trust the parm stack slot to be aligned enough |
4535 | for its ultimate type, don't use that slot after entry. | |
4536 | We'll make another stack slot, if we need one. */ | |
4537 | { | |
c8d8ed65 | 4538 | unsigned int thisparm_boundary |
621061f4 | 4539 | = FUNCTION_ARG_BOUNDARY (promoted_mode, passed_type); |
e16c591a RS |
4540 | |
4541 | if (GET_MODE_ALIGNMENT (nominal_mode) > thisparm_boundary) | |
4542 | stack_parm = 0; | |
4543 | } | |
4544 | ||
cb61f66f RS |
4545 | /* If parm was passed in memory, and we need to convert it on entry, |
4546 | don't store it back in that same slot. */ | |
4547 | if (entry_parm != 0 | |
4548 | && nominal_mode != BLKmode && nominal_mode != passed_mode) | |
4549 | stack_parm = 0; | |
4550 | ||
6f086dfc RS |
4551 | /* ENTRY_PARM is an RTX for the parameter as it arrives, |
4552 | in the mode in which it arrives. | |
4553 | STACK_PARM is an RTX for a stack slot where the parameter can live | |
4554 | during the function (in case we want to put it there). | |
4555 | STACK_PARM is 0 if no stack slot was pushed for it. | |
4556 | ||
4557 | Now output code if necessary to convert ENTRY_PARM to | |
4558 | the type in which this function declares it, | |
4559 | and store that result in an appropriate place, | |
4560 | which may be a pseudo reg, may be STACK_PARM, | |
4561 | or may be a local stack slot if STACK_PARM is 0. | |
4562 | ||
4563 | Set DECL_RTL to that place. */ | |
4564 | ||
5c4cdc9f | 4565 | if (nominal_mode == BLKmode || GET_CODE (entry_parm) == PARALLEL) |
6f086dfc | 4566 | { |
5c4cdc9f JW |
4567 | /* If a BLKmode arrives in registers, copy it to a stack slot. |
4568 | Handle calls that pass values in multiple non-contiguous | |
4569 | locations. The Irix 6 ABI has examples of this. */ | |
4570 | if (GET_CODE (entry_parm) == REG | |
4571 | || GET_CODE (entry_parm) == PARALLEL) | |
6f086dfc | 4572 | { |
621061f4 RK |
4573 | int size_stored |
4574 | = CEIL_ROUND (int_size_in_bytes (TREE_TYPE (parm)), | |
4575 | UNITS_PER_WORD); | |
6f086dfc RS |
4576 | |
4577 | /* Note that we will be storing an integral number of words. | |
4578 | So we have to be careful to ensure that we allocate an | |
4579 | integral number of words. We do this below in the | |
4580 | assign_stack_local if space was not allocated in the argument | |
4581 | list. If it was, this will not work if PARM_BOUNDARY is not | |
4582 | a multiple of BITS_PER_WORD. It isn't clear how to fix this | |
4583 | if it becomes a problem. */ | |
4584 | ||
4585 | if (stack_parm == 0) | |
7e41ffa2 RS |
4586 | { |
4587 | stack_parm | |
621061f4 RK |
4588 | = assign_stack_local (GET_MODE (entry_parm), |
4589 | size_stored, 0); | |
3bdf5ad1 | 4590 | set_mem_attributes (stack_parm, parm, 1); |
7e41ffa2 RS |
4591 | } |
4592 | ||
6f086dfc RS |
4593 | else if (PARM_BOUNDARY % BITS_PER_WORD != 0) |
4594 | abort (); | |
4595 | ||
5c4cdc9f JW |
4596 | /* Handle calls that pass values in multiple non-contiguous |
4597 | locations. The Irix 6 ABI has examples of this. */ | |
4598 | if (GET_CODE (entry_parm) == PARALLEL) | |
aac5cc16 RH |
4599 | emit_group_store (validize_mem (stack_parm), entry_parm, |
4600 | int_size_in_bytes (TREE_TYPE (parm)), | |
19caa751 | 4601 | TYPE_ALIGN (TREE_TYPE (parm))); |
5c4cdc9f JW |
4602 | else |
4603 | move_block_from_reg (REGNO (entry_parm), | |
4604 | validize_mem (stack_parm), | |
4605 | size_stored / UNITS_PER_WORD, | |
4606 | int_size_in_bytes (TREE_TYPE (parm))); | |
6f086dfc RS |
4607 | } |
4608 | DECL_RTL (parm) = stack_parm; | |
4609 | } | |
d29c259b RH |
4610 | else if (! ((! optimize |
4611 | && ! DECL_REGISTER (parm) | |
a82ad570 | 4612 | && ! DECL_INLINE (fndecl)) |
6f086dfc RS |
4613 | /* layout_decl may set this. */ |
4614 | || TREE_ADDRESSABLE (parm) | |
4615 | || TREE_SIDE_EFFECTS (parm) | |
4616 | /* If -ffloat-store specified, don't put explicit | |
4617 | float variables into registers. */ | |
4618 | || (flag_float_store | |
4619 | && TREE_CODE (TREE_TYPE (parm)) == REAL_TYPE)) | |
4620 | /* Always assign pseudo to structure return or item passed | |
4621 | by invisible reference. */ | |
4622 | || passed_pointer || parm == function_result_decl) | |
4623 | { | |
00d8a4c1 RK |
4624 | /* Store the parm in a pseudoregister during the function, but we |
4625 | may need to do it in a wider mode. */ | |
4626 | ||
4627 | register rtx parmreg; | |
770ae6cc | 4628 | unsigned int regno, regnoi = 0, regnor = 0; |
00d8a4c1 RK |
4629 | |
4630 | unsignedp = TREE_UNSIGNED (TREE_TYPE (parm)); | |
cd5b3469 | 4631 | |
621061f4 RK |
4632 | promoted_nominal_mode |
4633 | = promote_mode (TREE_TYPE (parm), nominal_mode, &unsignedp, 0); | |
6f086dfc | 4634 | |
621061f4 | 4635 | parmreg = gen_reg_rtx (promoted_nominal_mode); |
ddb7361a | 4636 | mark_user_reg (parmreg); |
6f086dfc RS |
4637 | |
4638 | /* If this was an item that we received a pointer to, set DECL_RTL | |
4639 | appropriately. */ | |
4640 | if (passed_pointer) | |
4641 | { | |
621061f4 | 4642 | DECL_RTL (parm) |
38a448ca | 4643 | = gen_rtx_MEM (TYPE_MODE (TREE_TYPE (passed_type)), parmreg); |
3bdf5ad1 | 4644 | set_mem_attributes (DECL_RTL (parm), parm, 1); |
6f086dfc RS |
4645 | } |
4646 | else | |
4647 | DECL_RTL (parm) = parmreg; | |
4648 | ||
4649 | /* Copy the value into the register. */ | |
621061f4 RK |
4650 | if (nominal_mode != passed_mode |
4651 | || promoted_nominal_mode != promoted_mode) | |
86f8eff3 | 4652 | { |
efd8cba0 | 4653 | int save_tree_used; |
621061f4 | 4654 | /* ENTRY_PARM has been converted to PROMOTED_MODE, its |
718fe406 | 4655 | mode, by the caller. We now have to convert it to |
621061f4 | 4656 | NOMINAL_MODE, if different. However, PARMREG may be in |
956d6950 | 4657 | a different mode than NOMINAL_MODE if it is being stored |
621061f4 RK |
4658 | promoted. |
4659 | ||
4660 | If ENTRY_PARM is a hard register, it might be in a register | |
86f8eff3 RK |
4661 | not valid for operating in its mode (e.g., an odd-numbered |
4662 | register for a DFmode). In that case, moves are the only | |
4663 | thing valid, so we can't do a convert from there. This | |
4664 | occurs when the calling sequence allow such misaligned | |
3412b298 JW |
4665 | usages. |
4666 | ||
4667 | In addition, the conversion may involve a call, which could | |
4668 | clobber parameters which haven't been copied to pseudo | |
4669 | registers yet. Therefore, we must first copy the parm to | |
4670 | a pseudo reg here, and save the conversion until after all | |
4671 | parameters have been moved. */ | |
4672 | ||
4673 | rtx tempreg = gen_reg_rtx (GET_MODE (entry_parm)); | |
4674 | ||
4675 | emit_move_insn (tempreg, validize_mem (entry_parm)); | |
4676 | ||
4677 | push_to_sequence (conversion_insns); | |
ad241351 RK |
4678 | tempreg = convert_to_mode (nominal_mode, tempreg, unsignedp); |
4679 | ||
efd8cba0 DB |
4680 | /* TREE_USED gets set erroneously during expand_assignment. */ |
4681 | save_tree_used = TREE_USED (parm); | |
621061f4 RK |
4682 | expand_assignment (parm, |
4683 | make_tree (nominal_type, tempreg), 0, 0); | |
efd8cba0 | 4684 | TREE_USED (parm) = save_tree_used; |
3412b298 | 4685 | conversion_insns = get_insns (); |
621061f4 | 4686 | did_conversion = 1; |
3412b298 | 4687 | end_sequence (); |
86f8eff3 | 4688 | } |
6f086dfc RS |
4689 | else |
4690 | emit_move_insn (parmreg, validize_mem (entry_parm)); | |
4691 | ||
74bd77a8 RS |
4692 | /* If we were passed a pointer but the actual value |
4693 | can safely live in a register, put it in one. */ | |
16bae307 | 4694 | if (passed_pointer && TYPE_MODE (TREE_TYPE (parm)) != BLKmode |
d29c259b RH |
4695 | && ! ((! optimize |
4696 | && ! DECL_REGISTER (parm) | |
74bd77a8 RS |
4697 | && ! DECL_INLINE (fndecl)) |
4698 | /* layout_decl may set this. */ | |
4699 | || TREE_ADDRESSABLE (parm) | |
4700 | || TREE_SIDE_EFFECTS (parm) | |
4701 | /* If -ffloat-store specified, don't put explicit | |
4702 | float variables into registers. */ | |
4703 | || (flag_float_store | |
4704 | && TREE_CODE (TREE_TYPE (parm)) == REAL_TYPE))) | |
4705 | { | |
2654605a JW |
4706 | /* We can't use nominal_mode, because it will have been set to |
4707 | Pmode above. We must use the actual mode of the parm. */ | |
4708 | parmreg = gen_reg_rtx (TYPE_MODE (TREE_TYPE (parm))); | |
ddb7361a | 4709 | mark_user_reg (parmreg); |
74bd77a8 RS |
4710 | emit_move_insn (parmreg, DECL_RTL (parm)); |
4711 | DECL_RTL (parm) = parmreg; | |
c110c53d RS |
4712 | /* STACK_PARM is the pointer, not the parm, and PARMREG is |
4713 | now the parm. */ | |
4714 | stack_parm = 0; | |
74bd77a8 | 4715 | } |
137a2a7b DE |
4716 | #ifdef FUNCTION_ARG_CALLEE_COPIES |
4717 | /* If we are passed an arg by reference and it is our responsibility | |
4718 | to make a copy, do it now. | |
4719 | PASSED_TYPE and PASSED mode now refer to the pointer, not the | |
4720 | original argument, so we must recreate them in the call to | |
4721 | FUNCTION_ARG_CALLEE_COPIES. */ | |
4722 | /* ??? Later add code to handle the case that if the argument isn't | |
4723 | modified, don't do the copy. */ | |
4724 | ||
4725 | else if (passed_pointer | |
4726 | && FUNCTION_ARG_CALLEE_COPIES (args_so_far, | |
4727 | TYPE_MODE (DECL_ARG_TYPE (parm)), | |
4728 | DECL_ARG_TYPE (parm), | |
bf9c83fe | 4729 | named_arg) |
926b1b99 | 4730 | && ! TREE_ADDRESSABLE (DECL_ARG_TYPE (parm))) |
137a2a7b DE |
4731 | { |
4732 | rtx copy; | |
4733 | tree type = DECL_ARG_TYPE (parm); | |
4734 | ||
4735 | /* This sequence may involve a library call perhaps clobbering | |
4736 | registers that haven't been copied to pseudos yet. */ | |
4737 | ||
4738 | push_to_sequence (conversion_insns); | |
4739 | ||
d0f062fb | 4740 | if (!COMPLETE_TYPE_P (type) |
137a2a7b | 4741 | || TREE_CODE (TYPE_SIZE (type)) != INTEGER_CST) |
1fd3ef7f | 4742 | /* This is a variable sized object. */ |
38a448ca RH |
4743 | copy = gen_rtx_MEM (BLKmode, |
4744 | allocate_dynamic_stack_space | |
4745 | (expr_size (parm), NULL_RTX, | |
4746 | TYPE_ALIGN (type))); | |
137a2a7b | 4747 | else |
1fd3ef7f RK |
4748 | copy = assign_stack_temp (TYPE_MODE (type), |
4749 | int_size_in_bytes (type), 1); | |
a696c1d6 | 4750 | set_mem_attributes (copy, parm, 1); |
137a2a7b DE |
4751 | |
4752 | store_expr (parm, copy, 0); | |
4753 | emit_move_insn (parmreg, XEXP (copy, 0)); | |
7d384cc0 | 4754 | if (current_function_check_memory_usage) |
ebb1b59a BS |
4755 | emit_library_call (chkr_set_right_libfunc, |
4756 | LCT_CONST_MAKE_BLOCK, VOIDmode, 3, | |
6a9c4aed | 4757 | XEXP (copy, 0), Pmode, |
86fa911a RK |
4758 | GEN_INT (int_size_in_bytes (type)), |
4759 | TYPE_MODE (sizetype), | |
956d6950 JL |
4760 | GEN_INT (MEMORY_USE_RW), |
4761 | TYPE_MODE (integer_type_node)); | |
137a2a7b | 4762 | conversion_insns = get_insns (); |
621061f4 | 4763 | did_conversion = 1; |
137a2a7b DE |
4764 | end_sequence (); |
4765 | } | |
4766 | #endif /* FUNCTION_ARG_CALLEE_COPIES */ | |
74bd77a8 | 4767 | |
6f086dfc | 4768 | /* In any case, record the parm's desired stack location |
718fe406 | 4769 | in case we later discover it must live in the stack. |
14aceb29 RS |
4770 | |
4771 | If it is a COMPLEX value, store the stack location for both | |
4772 | halves. */ | |
4773 | ||
4774 | if (GET_CODE (parmreg) == CONCAT) | |
4775 | regno = MAX (REGNO (XEXP (parmreg, 0)), REGNO (XEXP (parmreg, 1))); | |
4776 | else | |
4777 | regno = REGNO (parmreg); | |
4778 | ||
e9a25f70 | 4779 | if (regno >= max_parm_reg) |
6f086dfc RS |
4780 | { |
4781 | rtx *new; | |
e9a25f70 | 4782 | int old_max_parm_reg = max_parm_reg; |
14aceb29 | 4783 | |
e9a25f70 JL |
4784 | /* It's slow to expand this one register at a time, |
4785 | but it's also rare and we need max_parm_reg to be | |
4786 | precisely correct. */ | |
4787 | max_parm_reg = regno + 1; | |
e2ecd91c BS |
4788 | new = (rtx *) xrealloc (parm_reg_stack_loc, |
4789 | max_parm_reg * sizeof (rtx)); | |
e9a25f70 JL |
4790 | bzero ((char *) (new + old_max_parm_reg), |
4791 | (max_parm_reg - old_max_parm_reg) * sizeof (rtx)); | |
6f086dfc RS |
4792 | parm_reg_stack_loc = new; |
4793 | } | |
14aceb29 RS |
4794 | |
4795 | if (GET_CODE (parmreg) == CONCAT) | |
4796 | { | |
4797 | enum machine_mode submode = GET_MODE (XEXP (parmreg, 0)); | |
4798 | ||
a03caf76 RK |
4799 | regnor = REGNO (gen_realpart (submode, parmreg)); |
4800 | regnoi = REGNO (gen_imagpart (submode, parmreg)); | |
4801 | ||
7b1a0c14 RS |
4802 | if (stack_parm != 0) |
4803 | { | |
a03caf76 | 4804 | parm_reg_stack_loc[regnor] |
3d329b07 | 4805 | = gen_realpart (submode, stack_parm); |
a03caf76 | 4806 | parm_reg_stack_loc[regnoi] |
3d329b07 | 4807 | = gen_imagpart (submode, stack_parm); |
7b1a0c14 RS |
4808 | } |
4809 | else | |
4810 | { | |
a03caf76 RK |
4811 | parm_reg_stack_loc[regnor] = 0; |
4812 | parm_reg_stack_loc[regnoi] = 0; | |
7b1a0c14 | 4813 | } |
14aceb29 RS |
4814 | } |
4815 | else | |
4816 | parm_reg_stack_loc[REGNO (parmreg)] = stack_parm; | |
6f086dfc RS |
4817 | |
4818 | /* Mark the register as eliminable if we did no conversion | |
4819 | and it was copied from memory at a fixed offset, | |
4820 | and the arg pointer was not copied to a pseudo-reg. | |
4821 | If the arg pointer is a pseudo reg or the offset formed | |
4822 | an invalid address, such memory-equivalences | |
4823 | as we make here would screw up life analysis for it. */ | |
4824 | if (nominal_mode == passed_mode | |
621061f4 | 4825 | && ! did_conversion |
38b610ed ILT |
4826 | && stack_parm != 0 |
4827 | && GET_CODE (stack_parm) == MEM | |
6f086dfc RS |
4828 | && stack_offset.var == 0 |
4829 | && reg_mentioned_p (virtual_incoming_args_rtx, | |
38b610ed | 4830 | XEXP (stack_parm, 0))) |
a03caf76 RK |
4831 | { |
4832 | rtx linsn = get_last_insn (); | |
69685820 | 4833 | rtx sinsn, set; |
a03caf76 RK |
4834 | |
4835 | /* Mark complex types separately. */ | |
4836 | if (GET_CODE (parmreg) == CONCAT) | |
69685820 RK |
4837 | /* Scan backwards for the set of the real and |
4838 | imaginary parts. */ | |
4839 | for (sinsn = linsn; sinsn != 0; | |
4840 | sinsn = prev_nonnote_insn (sinsn)) | |
4841 | { | |
4842 | set = single_set (sinsn); | |
4843 | if (set != 0 | |
4844 | && SET_DEST (set) == regno_reg_rtx [regnoi]) | |
4845 | REG_NOTES (sinsn) | |
38a448ca RH |
4846 | = gen_rtx_EXPR_LIST (REG_EQUIV, |
4847 | parm_reg_stack_loc[regnoi], | |
4848 | REG_NOTES (sinsn)); | |
69685820 RK |
4849 | else if (set != 0 |
4850 | && SET_DEST (set) == regno_reg_rtx [regnor]) | |
4851 | REG_NOTES (sinsn) | |
38a448ca RH |
4852 | = gen_rtx_EXPR_LIST (REG_EQUIV, |
4853 | parm_reg_stack_loc[regnor], | |
4854 | REG_NOTES (sinsn)); | |
69685820 RK |
4855 | } |
4856 | else if ((set = single_set (linsn)) != 0 | |
4857 | && SET_DEST (set) == parmreg) | |
718fe406 | 4858 | REG_NOTES (linsn) |
38a448ca RH |
4859 | = gen_rtx_EXPR_LIST (REG_EQUIV, |
4860 | stack_parm, REG_NOTES (linsn)); | |
a03caf76 | 4861 | } |
6f086dfc RS |
4862 | |
4863 | /* For pointer data type, suggest pointer register. */ | |
e5e809f4 | 4864 | if (POINTER_TYPE_P (TREE_TYPE (parm))) |
6c6166bd | 4865 | mark_reg_pointer (parmreg, |
bdb429a5 RK |
4866 | TYPE_ALIGN (TREE_TYPE (TREE_TYPE (parm)))); |
4867 | ||
6f086dfc RS |
4868 | } |
4869 | else | |
4870 | { | |
4871 | /* Value must be stored in the stack slot STACK_PARM | |
4872 | during function execution. */ | |
4873 | ||
621061f4 | 4874 | if (promoted_mode != nominal_mode) |
86f8eff3 RK |
4875 | { |
4876 | /* Conversion is required. */ | |
3412b298 JW |
4877 | rtx tempreg = gen_reg_rtx (GET_MODE (entry_parm)); |
4878 | ||
4879 | emit_move_insn (tempreg, validize_mem (entry_parm)); | |
86f8eff3 | 4880 | |
3412b298 JW |
4881 | push_to_sequence (conversion_insns); |
4882 | entry_parm = convert_to_mode (nominal_mode, tempreg, | |
a53e14c0 | 4883 | TREE_UNSIGNED (TREE_TYPE (parm))); |
de957303 DE |
4884 | if (stack_parm) |
4885 | { | |
4886 | /* ??? This may need a big-endian conversion on sparc64. */ | |
4887 | stack_parm = change_address (stack_parm, nominal_mode, | |
4888 | NULL_RTX); | |
4889 | } | |
3412b298 | 4890 | conversion_insns = get_insns (); |
621061f4 | 4891 | did_conversion = 1; |
3412b298 | 4892 | end_sequence (); |
86f8eff3 | 4893 | } |
6f086dfc RS |
4894 | |
4895 | if (entry_parm != stack_parm) | |
4896 | { | |
4897 | if (stack_parm == 0) | |
7e41ffa2 RS |
4898 | { |
4899 | stack_parm | |
4900 | = assign_stack_local (GET_MODE (entry_parm), | |
4901 | GET_MODE_SIZE (GET_MODE (entry_parm)), 0); | |
3bdf5ad1 | 4902 | set_mem_attributes (stack_parm, parm, 1); |
7e41ffa2 RS |
4903 | } |
4904 | ||
621061f4 | 4905 | if (promoted_mode != nominal_mode) |
3412b298 JW |
4906 | { |
4907 | push_to_sequence (conversion_insns); | |
4908 | emit_move_insn (validize_mem (stack_parm), | |
4909 | validize_mem (entry_parm)); | |
4910 | conversion_insns = get_insns (); | |
4911 | end_sequence (); | |
4912 | } | |
4913 | else | |
4914 | emit_move_insn (validize_mem (stack_parm), | |
4915 | validize_mem (entry_parm)); | |
6f086dfc | 4916 | } |
7d384cc0 | 4917 | if (current_function_check_memory_usage) |
86fa911a RK |
4918 | { |
4919 | push_to_sequence (conversion_insns); | |
ebb1b59a BS |
4920 | emit_library_call (chkr_set_right_libfunc, LCT_CONST_MAKE_BLOCK, |
4921 | VOIDmode, 3, XEXP (stack_parm, 0), Pmode, | |
718fe406 | 4922 | GEN_INT (GET_MODE_SIZE (GET_MODE |
86fa911a RK |
4923 | (entry_parm))), |
4924 | TYPE_MODE (sizetype), | |
956d6950 JL |
4925 | GEN_INT (MEMORY_USE_RW), |
4926 | TYPE_MODE (integer_type_node)); | |
6f086dfc | 4927 | |
86fa911a RK |
4928 | conversion_insns = get_insns (); |
4929 | end_sequence (); | |
4930 | } | |
6f086dfc RS |
4931 | DECL_RTL (parm) = stack_parm; |
4932 | } | |
718fe406 | 4933 | |
6f086dfc RS |
4934 | /* If this "parameter" was the place where we are receiving the |
4935 | function's incoming structure pointer, set up the result. */ | |
4936 | if (parm == function_result_decl) | |
ccdecf58 RK |
4937 | { |
4938 | tree result = DECL_RESULT (fndecl); | |
ccdecf58 RK |
4939 | |
4940 | DECL_RTL (result) | |
38a448ca | 4941 | = gen_rtx_MEM (DECL_MODE (result), DECL_RTL (parm)); |
ccdecf58 | 4942 | |
3bdf5ad1 | 4943 | set_mem_attributes (DECL_RTL (result), result, 1); |
ccdecf58 | 4944 | } |
6f086dfc RS |
4945 | } |
4946 | ||
3412b298 JW |
4947 | /* Output all parameter conversion instructions (possibly including calls) |
4948 | now that all parameters have been copied out of hard registers. */ | |
4949 | emit_insns (conversion_insns); | |
4950 | ||
6f086dfc RS |
4951 | last_parm_insn = get_last_insn (); |
4952 | ||
4953 | current_function_args_size = stack_args_size.constant; | |
4954 | ||
4955 | /* Adjust function incoming argument size for alignment and | |
4956 | minimum length. */ | |
4957 | ||
4958 | #ifdef REG_PARM_STACK_SPACE | |
6f90e075 | 4959 | #ifndef MAYBE_REG_PARM_STACK_SPACE |
6f086dfc RS |
4960 | current_function_args_size = MAX (current_function_args_size, |
4961 | REG_PARM_STACK_SPACE (fndecl)); | |
4962 | #endif | |
6f90e075 | 4963 | #endif |
6f086dfc | 4964 | |
4433e339 RH |
4965 | #ifdef STACK_BOUNDARY |
4966 | #define STACK_BYTES (STACK_BOUNDARY / BITS_PER_UNIT) | |
4967 | ||
4968 | current_function_args_size | |
4969 | = ((current_function_args_size + STACK_BYTES - 1) | |
4970 | / STACK_BYTES) * STACK_BYTES; | |
718fe406 | 4971 | #endif |
4433e339 | 4972 | |
6f086dfc RS |
4973 | #ifdef ARGS_GROW_DOWNWARD |
4974 | current_function_arg_offset_rtx | |
5f4f0e22 | 4975 | = (stack_args_size.var == 0 ? GEN_INT (-stack_args_size.constant) |
718fe406 KH |
4976 | : expand_expr (size_diffop (stack_args_size.var, |
4977 | size_int (-stack_args_size.constant)), | |
86fa911a | 4978 | NULL_RTX, VOIDmode, EXPAND_MEMORY_USE_BAD)); |
6f086dfc RS |
4979 | #else |
4980 | current_function_arg_offset_rtx = ARGS_SIZE_RTX (stack_args_size); | |
4981 | #endif | |
4982 | ||
4983 | /* See how many bytes, if any, of its args a function should try to pop | |
4984 | on return. */ | |
4985 | ||
64e6d9cc | 4986 | current_function_pops_args = RETURN_POPS_ARGS (fndecl, TREE_TYPE (fndecl), |
6f086dfc RS |
4987 | current_function_args_size); |
4988 | ||
3b69d50e RK |
4989 | /* For stdarg.h function, save info about |
4990 | regs and stack space used by the named args. */ | |
6f086dfc | 4991 | |
3b69d50e | 4992 | if (!hide_last_arg) |
6f086dfc RS |
4993 | current_function_args_info = args_so_far; |
4994 | ||
4995 | /* Set the rtx used for the function return value. Put this in its | |
4996 | own variable so any optimizers that need this information don't have | |
4997 | to include tree.h. Do this here so it gets done when an inlined | |
4998 | function gets output. */ | |
4999 | ||
5000 | current_function_return_rtx = DECL_RTL (DECL_RESULT (fndecl)); | |
5001 | } | |
5002 | \f | |
75dc3319 RK |
5003 | /* Indicate whether REGNO is an incoming argument to the current function |
5004 | that was promoted to a wider mode. If so, return the RTX for the | |
5005 | register (to get its mode). PMODE and PUNSIGNEDP are set to the mode | |
5006 | that REGNO is promoted from and whether the promotion was signed or | |
5007 | unsigned. */ | |
5008 | ||
5009 | #ifdef PROMOTE_FUNCTION_ARGS | |
5010 | ||
5011 | rtx | |
5012 | promoted_input_arg (regno, pmode, punsignedp) | |
770ae6cc | 5013 | unsigned int regno; |
75dc3319 RK |
5014 | enum machine_mode *pmode; |
5015 | int *punsignedp; | |
5016 | { | |
5017 | tree arg; | |
5018 | ||
5019 | for (arg = DECL_ARGUMENTS (current_function_decl); arg; | |
5020 | arg = TREE_CHAIN (arg)) | |
5021 | if (GET_CODE (DECL_INCOMING_RTL (arg)) == REG | |
621061f4 RK |
5022 | && REGNO (DECL_INCOMING_RTL (arg)) == regno |
5023 | && TYPE_MODE (DECL_ARG_TYPE (arg)) == TYPE_MODE (TREE_TYPE (arg))) | |
75dc3319 RK |
5024 | { |
5025 | enum machine_mode mode = TYPE_MODE (TREE_TYPE (arg)); | |
5026 | int unsignedp = TREE_UNSIGNED (TREE_TYPE (arg)); | |
5027 | ||
a5a52dbc | 5028 | mode = promote_mode (TREE_TYPE (arg), mode, &unsignedp, 1); |
75dc3319 RK |
5029 | if (mode == GET_MODE (DECL_INCOMING_RTL (arg)) |
5030 | && mode != DECL_MODE (arg)) | |
5031 | { | |
5032 | *pmode = DECL_MODE (arg); | |
5033 | *punsignedp = unsignedp; | |
5034 | return DECL_INCOMING_RTL (arg); | |
5035 | } | |
5036 | } | |
5037 | ||
5038 | return 0; | |
5039 | } | |
5040 | ||
5041 | #endif | |
5042 | \f | |
6f086dfc RS |
5043 | /* Compute the size and offset from the start of the stacked arguments for a |
5044 | parm passed in mode PASSED_MODE and with type TYPE. | |
5045 | ||
5046 | INITIAL_OFFSET_PTR points to the current offset into the stacked | |
5047 | arguments. | |
5048 | ||
5049 | The starting offset and size for this parm are returned in *OFFSET_PTR | |
5050 | and *ARG_SIZE_PTR, respectively. | |
5051 | ||
5052 | IN_REGS is non-zero if the argument will be passed in registers. It will | |
5053 | never be set if REG_PARM_STACK_SPACE is not defined. | |
5054 | ||
5055 | FNDECL is the function in which the argument was defined. | |
5056 | ||
5057 | There are two types of rounding that are done. The first, controlled by | |
5058 | FUNCTION_ARG_BOUNDARY, forces the offset from the start of the argument | |
5059 | list to be aligned to the specific boundary (in bits). This rounding | |
5060 | affects the initial and starting offsets, but not the argument size. | |
5061 | ||
5062 | The second, controlled by FUNCTION_ARG_PADDING and PARM_BOUNDARY, | |
5063 | optionally rounds the size of the parm to PARM_BOUNDARY. The | |
5064 | initial offset is not affected by this rounding, while the size always | |
5065 | is and the starting offset may be. */ | |
5066 | ||
718fe406 | 5067 | /* offset_ptr will be negative for ARGS_GROW_DOWNWARD case; |
6f086dfc RS |
5068 | initial_offset_ptr is positive because locate_and_pad_parm's |
5069 | callers pass in the total size of args so far as | |
5070 | initial_offset_ptr. arg_size_ptr is always positive.*/ | |
5071 | ||
6f086dfc RS |
5072 | void |
5073 | locate_and_pad_parm (passed_mode, type, in_regs, fndecl, | |
4fc026cd | 5074 | initial_offset_ptr, offset_ptr, arg_size_ptr, |
718fe406 | 5075 | alignment_pad) |
6f086dfc RS |
5076 | enum machine_mode passed_mode; |
5077 | tree type; | |
57bed152 | 5078 | int in_regs ATTRIBUTE_UNUSED; |
91813b28 | 5079 | tree fndecl ATTRIBUTE_UNUSED; |
6f086dfc RS |
5080 | struct args_size *initial_offset_ptr; |
5081 | struct args_size *offset_ptr; | |
5082 | struct args_size *arg_size_ptr; | |
4fc026cd CM |
5083 | struct args_size *alignment_pad; |
5084 | ||
6f086dfc RS |
5085 | { |
5086 | tree sizetree | |
5087 | = type ? size_in_bytes (type) : size_int (GET_MODE_SIZE (passed_mode)); | |
5088 | enum direction where_pad = FUNCTION_ARG_PADDING (passed_mode, type); | |
5089 | int boundary = FUNCTION_ARG_BOUNDARY (passed_mode, type); | |
6f086dfc RS |
5090 | |
5091 | #ifdef REG_PARM_STACK_SPACE | |
5092 | /* If we have found a stack parm before we reach the end of the | |
5093 | area reserved for registers, skip that area. */ | |
5094 | if (! in_regs) | |
5095 | { | |
29a82058 JL |
5096 | int reg_parm_stack_space = 0; |
5097 | ||
29008b51 JW |
5098 | #ifdef MAYBE_REG_PARM_STACK_SPACE |
5099 | reg_parm_stack_space = MAYBE_REG_PARM_STACK_SPACE; | |
5100 | #else | |
6f086dfc | 5101 | reg_parm_stack_space = REG_PARM_STACK_SPACE (fndecl); |
29008b51 | 5102 | #endif |
6f086dfc RS |
5103 | if (reg_parm_stack_space > 0) |
5104 | { | |
5105 | if (initial_offset_ptr->var) | |
5106 | { | |
5107 | initial_offset_ptr->var | |
5108 | = size_binop (MAX_EXPR, ARGS_SIZE_TREE (*initial_offset_ptr), | |
fed3cef0 | 5109 | ssize_int (reg_parm_stack_space)); |
6f086dfc RS |
5110 | initial_offset_ptr->constant = 0; |
5111 | } | |
5112 | else if (initial_offset_ptr->constant < reg_parm_stack_space) | |
5113 | initial_offset_ptr->constant = reg_parm_stack_space; | |
5114 | } | |
5115 | } | |
5116 | #endif /* REG_PARM_STACK_SPACE */ | |
5117 | ||
5118 | arg_size_ptr->var = 0; | |
5119 | arg_size_ptr->constant = 0; | |
5120 | ||
5121 | #ifdef ARGS_GROW_DOWNWARD | |
5122 | if (initial_offset_ptr->var) | |
5123 | { | |
5124 | offset_ptr->constant = 0; | |
fed3cef0 | 5125 | offset_ptr->var = size_binop (MINUS_EXPR, ssize_int (0), |
6f086dfc RS |
5126 | initial_offset_ptr->var); |
5127 | } | |
5128 | else | |
5129 | { | |
718fe406 | 5130 | offset_ptr->constant = -initial_offset_ptr->constant; |
6f086dfc RS |
5131 | offset_ptr->var = 0; |
5132 | } | |
0b21dcf5 | 5133 | if (where_pad != none |
6f086dfc RS |
5134 | && (TREE_CODE (sizetree) != INTEGER_CST |
5135 | || ((TREE_INT_CST_LOW (sizetree) * BITS_PER_UNIT) % PARM_BOUNDARY))) | |
5136 | sizetree = round_up (sizetree, PARM_BOUNDARY / BITS_PER_UNIT); | |
5137 | SUB_PARM_SIZE (*offset_ptr, sizetree); | |
66bcbe19 | 5138 | if (where_pad != downward) |
4fc026cd | 5139 | pad_to_arg_alignment (offset_ptr, boundary, alignment_pad); |
6f086dfc | 5140 | if (initial_offset_ptr->var) |
fed3cef0 RK |
5141 | arg_size_ptr->var = size_binop (MINUS_EXPR, |
5142 | size_binop (MINUS_EXPR, | |
5143 | ssize_int (0), | |
5144 | initial_offset_ptr->var), | |
5145 | offset_ptr->var); | |
5146 | ||
6f086dfc | 5147 | else |
718fe406 KH |
5148 | arg_size_ptr->constant = (-initial_offset_ptr->constant |
5149 | - offset_ptr->constant); | |
fed3cef0 | 5150 | |
6f086dfc | 5151 | #else /* !ARGS_GROW_DOWNWARD */ |
4fc026cd | 5152 | pad_to_arg_alignment (initial_offset_ptr, boundary, alignment_pad); |
6f086dfc | 5153 | *offset_ptr = *initial_offset_ptr; |
6f086dfc RS |
5154 | |
5155 | #ifdef PUSH_ROUNDING | |
5156 | if (passed_mode != BLKmode) | |
5157 | sizetree = size_int (PUSH_ROUNDING (TREE_INT_CST_LOW (sizetree))); | |
5158 | #endif | |
5159 | ||
d4b0a7a0 DE |
5160 | /* Pad_below needs the pre-rounded size to know how much to pad below |
5161 | so this must be done before rounding up. */ | |
ea5917da DE |
5162 | if (where_pad == downward |
5163 | /* However, BLKmode args passed in regs have their padding done elsewhere. | |
5164 | The stack slot must be able to hold the entire register. */ | |
5165 | && !(in_regs && passed_mode == BLKmode)) | |
d4b0a7a0 DE |
5166 | pad_below (offset_ptr, passed_mode, sizetree); |
5167 | ||
6f086dfc RS |
5168 | if (where_pad != none |
5169 | && (TREE_CODE (sizetree) != INTEGER_CST | |
5170 | || ((TREE_INT_CST_LOW (sizetree) * BITS_PER_UNIT) % PARM_BOUNDARY))) | |
5171 | sizetree = round_up (sizetree, PARM_BOUNDARY / BITS_PER_UNIT); | |
5172 | ||
5173 | ADD_PARM_SIZE (*arg_size_ptr, sizetree); | |
5174 | #endif /* ARGS_GROW_DOWNWARD */ | |
5175 | } | |
5176 | ||
e16c591a RS |
5177 | /* Round the stack offset in *OFFSET_PTR up to a multiple of BOUNDARY. |
5178 | BOUNDARY is measured in bits, but must be a multiple of a storage unit. */ | |
5179 | ||
6f086dfc | 5180 | static void |
4fc026cd | 5181 | pad_to_arg_alignment (offset_ptr, boundary, alignment_pad) |
6f086dfc RS |
5182 | struct args_size *offset_ptr; |
5183 | int boundary; | |
4fc026cd | 5184 | struct args_size *alignment_pad; |
6f086dfc | 5185 | { |
a544cfd2 KG |
5186 | tree save_var = NULL_TREE; |
5187 | HOST_WIDE_INT save_constant = 0; | |
4fc026cd | 5188 | |
6f086dfc | 5189 | int boundary_in_bytes = boundary / BITS_PER_UNIT; |
718fe406 | 5190 | |
9399d5c6 | 5191 | if (boundary > PARM_BOUNDARY && boundary > STACK_BOUNDARY) |
4fc026cd CM |
5192 | { |
5193 | save_var = offset_ptr->var; | |
5194 | save_constant = offset_ptr->constant; | |
5195 | } | |
5196 | ||
5197 | alignment_pad->var = NULL_TREE; | |
5198 | alignment_pad->constant = 0; | |
4fc026cd | 5199 | |
6f086dfc RS |
5200 | if (boundary > BITS_PER_UNIT) |
5201 | { | |
5202 | if (offset_ptr->var) | |
5203 | { | |
718fe406 | 5204 | offset_ptr->var = |
6f086dfc | 5205 | #ifdef ARGS_GROW_DOWNWARD |
718fe406 | 5206 | round_down |
6f086dfc RS |
5207 | #else |
5208 | round_up | |
5209 | #endif | |
5210 | (ARGS_SIZE_TREE (*offset_ptr), | |
5211 | boundary / BITS_PER_UNIT); | |
5212 | offset_ptr->constant = 0; /*?*/ | |
9399d5c6 | 5213 | if (boundary > PARM_BOUNDARY && boundary > STACK_BOUNDARY) |
fed3cef0 RK |
5214 | alignment_pad->var = size_binop (MINUS_EXPR, offset_ptr->var, |
5215 | save_var); | |
6f086dfc RS |
5216 | } |
5217 | else | |
718fe406 | 5218 | { |
fbb57b2a | 5219 | offset_ptr->constant = |
6f086dfc | 5220 | #ifdef ARGS_GROW_DOWNWARD |
fbb57b2a | 5221 | FLOOR_ROUND (offset_ptr->constant, boundary_in_bytes); |
6f086dfc | 5222 | #else |
fbb57b2a | 5223 | CEIL_ROUND (offset_ptr->constant, boundary_in_bytes); |
6f086dfc | 5224 | #endif |
718fe406 KH |
5225 | if (boundary > PARM_BOUNDARY && boundary > STACK_BOUNDARY) |
5226 | alignment_pad->constant = offset_ptr->constant - save_constant; | |
5227 | } | |
6f086dfc RS |
5228 | } |
5229 | } | |
5230 | ||
51723711 | 5231 | #ifndef ARGS_GROW_DOWNWARD |
6f086dfc RS |
5232 | static void |
5233 | pad_below (offset_ptr, passed_mode, sizetree) | |
5234 | struct args_size *offset_ptr; | |
5235 | enum machine_mode passed_mode; | |
5236 | tree sizetree; | |
5237 | { | |
5238 | if (passed_mode != BLKmode) | |
5239 | { | |
5240 | if (GET_MODE_BITSIZE (passed_mode) % PARM_BOUNDARY) | |
5241 | offset_ptr->constant | |
5242 | += (((GET_MODE_BITSIZE (passed_mode) + PARM_BOUNDARY - 1) | |
5243 | / PARM_BOUNDARY * PARM_BOUNDARY / BITS_PER_UNIT) | |
5244 | - GET_MODE_SIZE (passed_mode)); | |
5245 | } | |
5246 | else | |
5247 | { | |
5248 | if (TREE_CODE (sizetree) != INTEGER_CST | |
5249 | || (TREE_INT_CST_LOW (sizetree) * BITS_PER_UNIT) % PARM_BOUNDARY) | |
5250 | { | |
5251 | /* Round the size up to multiple of PARM_BOUNDARY bits. */ | |
5252 | tree s2 = round_up (sizetree, PARM_BOUNDARY / BITS_PER_UNIT); | |
5253 | /* Add it in. */ | |
5254 | ADD_PARM_SIZE (*offset_ptr, s2); | |
5255 | SUB_PARM_SIZE (*offset_ptr, sizetree); | |
5256 | } | |
5257 | } | |
5258 | } | |
51723711 | 5259 | #endif |
6f086dfc RS |
5260 | \f |
5261 | /* Walk the tree of blocks describing the binding levels within a function | |
5262 | and warn about uninitialized variables. | |
5263 | This is done after calling flow_analysis and before global_alloc | |
5264 | clobbers the pseudo-regs to hard regs. */ | |
5265 | ||
5266 | void | |
5267 | uninitialized_vars_warning (block) | |
5268 | tree block; | |
5269 | { | |
5270 | register tree decl, sub; | |
5271 | for (decl = BLOCK_VARS (block); decl; decl = TREE_CHAIN (decl)) | |
5272 | { | |
8fbe1035 ML |
5273 | if (warn_uninitialized |
5274 | && TREE_CODE (decl) == VAR_DECL | |
6f086dfc RS |
5275 | /* These warnings are unreliable for and aggregates |
5276 | because assigning the fields one by one can fail to convince | |
5277 | flow.c that the entire aggregate was initialized. | |
5278 | Unions are troublesome because members may be shorter. */ | |
05e3bdb9 | 5279 | && ! AGGREGATE_TYPE_P (TREE_TYPE (decl)) |
6f086dfc RS |
5280 | && DECL_RTL (decl) != 0 |
5281 | && GET_CODE (DECL_RTL (decl)) == REG | |
6acdd0fd JL |
5282 | /* Global optimizations can make it difficult to determine if a |
5283 | particular variable has been initialized. However, a VAR_DECL | |
5284 | with a nonzero DECL_INITIAL had an initializer, so do not | |
5285 | claim it is potentially uninitialized. | |
5286 | ||
5287 | We do not care about the actual value in DECL_INITIAL, so we do | |
5288 | not worry that it may be a dangling pointer. */ | |
5289 | && DECL_INITIAL (decl) == NULL_TREE | |
6f086dfc RS |
5290 | && regno_uninitialized (REGNO (DECL_RTL (decl)))) |
5291 | warning_with_decl (decl, | |
3c8cd8bd | 5292 | "`%s' might be used uninitialized in this function"); |
8fbe1035 ML |
5293 | if (extra_warnings |
5294 | && TREE_CODE (decl) == VAR_DECL | |
6f086dfc RS |
5295 | && DECL_RTL (decl) != 0 |
5296 | && GET_CODE (DECL_RTL (decl)) == REG | |
5297 | && regno_clobbered_at_setjmp (REGNO (DECL_RTL (decl)))) | |
5298 | warning_with_decl (decl, | |
3c8cd8bd | 5299 | "variable `%s' might be clobbered by `longjmp' or `vfork'"); |
6f086dfc RS |
5300 | } |
5301 | for (sub = BLOCK_SUBBLOCKS (block); sub; sub = TREE_CHAIN (sub)) | |
5302 | uninitialized_vars_warning (sub); | |
5303 | } | |
5304 | ||
5305 | /* Do the appropriate part of uninitialized_vars_warning | |
5306 | but for arguments instead of local variables. */ | |
5307 | ||
5308 | void | |
0cd6ef35 | 5309 | setjmp_args_warning () |
6f086dfc RS |
5310 | { |
5311 | register tree decl; | |
5312 | for (decl = DECL_ARGUMENTS (current_function_decl); | |
5313 | decl; decl = TREE_CHAIN (decl)) | |
5314 | if (DECL_RTL (decl) != 0 | |
5315 | && GET_CODE (DECL_RTL (decl)) == REG | |
5316 | && regno_clobbered_at_setjmp (REGNO (DECL_RTL (decl)))) | |
718fe406 KH |
5317 | warning_with_decl (decl, |
5318 | "argument `%s' might be clobbered by `longjmp' or `vfork'"); | |
6f086dfc RS |
5319 | } |
5320 | ||
5321 | /* If this function call setjmp, put all vars into the stack | |
5322 | unless they were declared `register'. */ | |
5323 | ||
5324 | void | |
5325 | setjmp_protect (block) | |
5326 | tree block; | |
5327 | { | |
5328 | register tree decl, sub; | |
5329 | for (decl = BLOCK_VARS (block); decl; decl = TREE_CHAIN (decl)) | |
5330 | if ((TREE_CODE (decl) == VAR_DECL | |
5331 | || TREE_CODE (decl) == PARM_DECL) | |
5332 | && DECL_RTL (decl) != 0 | |
e9a25f70 JL |
5333 | && (GET_CODE (DECL_RTL (decl)) == REG |
5334 | || (GET_CODE (DECL_RTL (decl)) == MEM | |
5335 | && GET_CODE (XEXP (DECL_RTL (decl), 0)) == ADDRESSOF)) | |
b335c2cc | 5336 | /* If this variable came from an inline function, it must be |
9ec36da5 | 5337 | that its life doesn't overlap the setjmp. If there was a |
b335c2cc TW |
5338 | setjmp in the function, it would already be in memory. We |
5339 | must exclude such variable because their DECL_RTL might be | |
5340 | set to strange things such as virtual_stack_vars_rtx. */ | |
5341 | && ! DECL_FROM_INLINE (decl) | |
6f086dfc RS |
5342 | && ( |
5343 | #ifdef NON_SAVING_SETJMP | |
5344 | /* If longjmp doesn't restore the registers, | |
5345 | don't put anything in them. */ | |
5346 | NON_SAVING_SETJMP | |
5347 | || | |
5348 | #endif | |
a82ad570 | 5349 | ! DECL_REGISTER (decl))) |
6f086dfc RS |
5350 | put_var_into_stack (decl); |
5351 | for (sub = BLOCK_SUBBLOCKS (block); sub; sub = TREE_CHAIN (sub)) | |
5352 | setjmp_protect (sub); | |
5353 | } | |
5354 | \f | |
5355 | /* Like the previous function, but for args instead of local variables. */ | |
5356 | ||
5357 | void | |
5358 | setjmp_protect_args () | |
5359 | { | |
29a82058 | 5360 | register tree decl; |
6f086dfc RS |
5361 | for (decl = DECL_ARGUMENTS (current_function_decl); |
5362 | decl; decl = TREE_CHAIN (decl)) | |
5363 | if ((TREE_CODE (decl) == VAR_DECL | |
5364 | || TREE_CODE (decl) == PARM_DECL) | |
5365 | && DECL_RTL (decl) != 0 | |
e9a25f70 JL |
5366 | && (GET_CODE (DECL_RTL (decl)) == REG |
5367 | || (GET_CODE (DECL_RTL (decl)) == MEM | |
5368 | && GET_CODE (XEXP (DECL_RTL (decl), 0)) == ADDRESSOF)) | |
6f086dfc RS |
5369 | && ( |
5370 | /* If longjmp doesn't restore the registers, | |
5371 | don't put anything in them. */ | |
5372 | #ifdef NON_SAVING_SETJMP | |
5373 | NON_SAVING_SETJMP | |
5374 | || | |
5375 | #endif | |
a82ad570 | 5376 | ! DECL_REGISTER (decl))) |
6f086dfc RS |
5377 | put_var_into_stack (decl); |
5378 | } | |
5379 | \f | |
5380 | /* Return the context-pointer register corresponding to DECL, | |
5381 | or 0 if it does not need one. */ | |
5382 | ||
5383 | rtx | |
5384 | lookup_static_chain (decl) | |
5385 | tree decl; | |
5386 | { | |
b001a02f PB |
5387 | tree context = decl_function_context (decl); |
5388 | tree link; | |
7ad8c4bf | 5389 | |
38ee6ed9 JM |
5390 | if (context == 0 |
5391 | || (TREE_CODE (decl) == FUNCTION_DECL && DECL_NO_STATIC_CHAIN (decl))) | |
7ad8c4bf | 5392 | return 0; |
38ee6ed9 | 5393 | |
6f086dfc RS |
5394 | /* We treat inline_function_decl as an alias for the current function |
5395 | because that is the inline function whose vars, types, etc. | |
5396 | are being merged into the current function. | |
5397 | See expand_inline_function. */ | |
5398 | if (context == current_function_decl || context == inline_function_decl) | |
5399 | return virtual_stack_vars_rtx; | |
5400 | ||
5401 | for (link = context_display; link; link = TREE_CHAIN (link)) | |
5402 | if (TREE_PURPOSE (link) == context) | |
5403 | return RTL_EXPR_RTL (TREE_VALUE (link)); | |
5404 | ||
5405 | abort (); | |
5406 | } | |
5407 | \f | |
5408 | /* Convert a stack slot address ADDR for variable VAR | |
5409 | (from a containing function) | |
5410 | into an address valid in this function (using a static chain). */ | |
5411 | ||
5412 | rtx | |
5413 | fix_lexical_addr (addr, var) | |
5414 | rtx addr; | |
5415 | tree var; | |
5416 | { | |
5417 | rtx basereg; | |
e5e809f4 | 5418 | HOST_WIDE_INT displacement; |
6f086dfc RS |
5419 | tree context = decl_function_context (var); |
5420 | struct function *fp; | |
5421 | rtx base = 0; | |
5422 | ||
5423 | /* If this is the present function, we need not do anything. */ | |
5424 | if (context == current_function_decl || context == inline_function_decl) | |
5425 | return addr; | |
5426 | ||
5427 | for (fp = outer_function_chain; fp; fp = fp->next) | |
5428 | if (fp->decl == context) | |
5429 | break; | |
5430 | ||
5431 | if (fp == 0) | |
5432 | abort (); | |
5433 | ||
e9a25f70 JL |
5434 | if (GET_CODE (addr) == ADDRESSOF && GET_CODE (XEXP (addr, 0)) == MEM) |
5435 | addr = XEXP (XEXP (addr, 0), 0); | |
5436 | ||
6f086dfc RS |
5437 | /* Decode given address as base reg plus displacement. */ |
5438 | if (GET_CODE (addr) == REG) | |
5439 | basereg = addr, displacement = 0; | |
5440 | else if (GET_CODE (addr) == PLUS && GET_CODE (XEXP (addr, 1)) == CONST_INT) | |
5441 | basereg = XEXP (addr, 0), displacement = INTVAL (XEXP (addr, 1)); | |
5442 | else | |
5443 | abort (); | |
5444 | ||
5445 | /* We accept vars reached via the containing function's | |
5446 | incoming arg pointer and via its stack variables pointer. */ | |
5447 | if (basereg == fp->internal_arg_pointer) | |
5448 | { | |
5449 | /* If reached via arg pointer, get the arg pointer value | |
5450 | out of that function's stack frame. | |
5451 | ||
5452 | There are two cases: If a separate ap is needed, allocate a | |
5453 | slot in the outer function for it and dereference it that way. | |
5454 | This is correct even if the real ap is actually a pseudo. | |
5455 | Otherwise, just adjust the offset from the frame pointer to | |
5456 | compensate. */ | |
5457 | ||
5458 | #ifdef NEED_SEPARATE_AP | |
5459 | rtx addr; | |
5460 | ||
49ad7cfa BS |
5461 | if (fp->x_arg_pointer_save_area == 0) |
5462 | fp->x_arg_pointer_save_area | |
e2ecd91c | 5463 | = assign_stack_local_1 (Pmode, GET_MODE_SIZE (Pmode), 0, fp); |
6f086dfc | 5464 | |
49ad7cfa | 5465 | addr = fix_lexical_addr (XEXP (fp->x_arg_pointer_save_area, 0), var); |
6f086dfc RS |
5466 | addr = memory_address (Pmode, addr); |
5467 | ||
3bdf5ad1 RK |
5468 | base = gen_rtx_MEM (Pmode, addr); |
5469 | MEM_ALIAS_SET (base) = get_frame_alias_set (); | |
5470 | base = copy_to_reg (base); | |
6f086dfc RS |
5471 | #else |
5472 | displacement += (FIRST_PARM_OFFSET (context) - STARTING_FRAME_OFFSET); | |
86f8eff3 | 5473 | base = lookup_static_chain (var); |
6f086dfc RS |
5474 | #endif |
5475 | } | |
5476 | ||
5477 | else if (basereg == virtual_stack_vars_rtx) | |
5478 | { | |
5479 | /* This is the same code as lookup_static_chain, duplicated here to | |
5480 | avoid an extra call to decl_function_context. */ | |
5481 | tree link; | |
5482 | ||
5483 | for (link = context_display; link; link = TREE_CHAIN (link)) | |
5484 | if (TREE_PURPOSE (link) == context) | |
5485 | { | |
5486 | base = RTL_EXPR_RTL (TREE_VALUE (link)); | |
5487 | break; | |
5488 | } | |
5489 | } | |
5490 | ||
5491 | if (base == 0) | |
5492 | abort (); | |
5493 | ||
5494 | /* Use same offset, relative to appropriate static chain or argument | |
5495 | pointer. */ | |
5496 | return plus_constant (base, displacement); | |
5497 | } | |
5498 | \f | |
5499 | /* Return the address of the trampoline for entering nested fn FUNCTION. | |
5500 | If necessary, allocate a trampoline (in the stack frame) | |
5501 | and emit rtl to initialize its contents (at entry to this function). */ | |
5502 | ||
5503 | rtx | |
5504 | trampoline_address (function) | |
5505 | tree function; | |
5506 | { | |
5507 | tree link; | |
5508 | tree rtlexp; | |
5509 | rtx tramp; | |
5510 | struct function *fp; | |
5511 | tree fn_context; | |
5512 | ||
5513 | /* Find an existing trampoline and return it. */ | |
5514 | for (link = trampoline_list; link; link = TREE_CHAIN (link)) | |
5515 | if (TREE_PURPOSE (link) == function) | |
e87ee2a9 RK |
5516 | return |
5517 | round_trampoline_addr (XEXP (RTL_EXPR_RTL (TREE_VALUE (link)), 0)); | |
5518 | ||
6f086dfc | 5519 | for (fp = outer_function_chain; fp; fp = fp->next) |
49ad7cfa | 5520 | for (link = fp->x_trampoline_list; link; link = TREE_CHAIN (link)) |
6f086dfc RS |
5521 | if (TREE_PURPOSE (link) == function) |
5522 | { | |
5523 | tramp = fix_lexical_addr (XEXP (RTL_EXPR_RTL (TREE_VALUE (link)), 0), | |
5524 | function); | |
5525 | return round_trampoline_addr (tramp); | |
5526 | } | |
5527 | ||
5528 | /* None exists; we must make one. */ | |
5529 | ||
5530 | /* Find the `struct function' for the function containing FUNCTION. */ | |
5531 | fp = 0; | |
5532 | fn_context = decl_function_context (function); | |
4ac74fb8 RK |
5533 | if (fn_context != current_function_decl |
5534 | && fn_context != inline_function_decl) | |
6f086dfc RS |
5535 | for (fp = outer_function_chain; fp; fp = fp->next) |
5536 | if (fp->decl == fn_context) | |
5537 | break; | |
5538 | ||
5539 | /* Allocate run-time space for this trampoline | |
5540 | (usually in the defining function's stack frame). */ | |
5541 | #ifdef ALLOCATE_TRAMPOLINE | |
5542 | tramp = ALLOCATE_TRAMPOLINE (fp); | |
5543 | #else | |
5544 | /* If rounding needed, allocate extra space | |
5545 | to ensure we have TRAMPOLINE_SIZE bytes left after rounding up. */ | |
5546 | #ifdef TRAMPOLINE_ALIGNMENT | |
b02ab63a RK |
5547 | #define TRAMPOLINE_REAL_SIZE \ |
5548 | (TRAMPOLINE_SIZE + (TRAMPOLINE_ALIGNMENT / BITS_PER_UNIT) - 1) | |
6f086dfc RS |
5549 | #else |
5550 | #define TRAMPOLINE_REAL_SIZE (TRAMPOLINE_SIZE) | |
5551 | #endif | |
e2ecd91c | 5552 | tramp = assign_stack_local_1 (BLKmode, TRAMPOLINE_REAL_SIZE, 0, |
01d939e8 | 5553 | fp ? fp : cfun); |
6f086dfc RS |
5554 | #endif |
5555 | ||
5556 | /* Record the trampoline for reuse and note it for later initialization | |
5557 | by expand_function_end. */ | |
5558 | if (fp != 0) | |
5559 | { | |
6f086dfc RS |
5560 | rtlexp = make_node (RTL_EXPR); |
5561 | RTL_EXPR_RTL (rtlexp) = tramp; | |
49ad7cfa BS |
5562 | fp->x_trampoline_list = tree_cons (function, rtlexp, |
5563 | fp->x_trampoline_list); | |
6f086dfc RS |
5564 | } |
5565 | else | |
5566 | { | |
5567 | /* Make the RTL_EXPR node temporary, not momentary, so that the | |
5568 | trampoline_list doesn't become garbage. */ | |
6f086dfc | 5569 | rtlexp = make_node (RTL_EXPR); |
6f086dfc RS |
5570 | |
5571 | RTL_EXPR_RTL (rtlexp) = tramp; | |
5572 | trampoline_list = tree_cons (function, rtlexp, trampoline_list); | |
5573 | } | |
5574 | ||
5575 | tramp = fix_lexical_addr (XEXP (tramp, 0), function); | |
5576 | return round_trampoline_addr (tramp); | |
5577 | } | |
5578 | ||
5579 | /* Given a trampoline address, | |
5580 | round it to multiple of TRAMPOLINE_ALIGNMENT. */ | |
5581 | ||
5582 | static rtx | |
5583 | round_trampoline_addr (tramp) | |
5584 | rtx tramp; | |
5585 | { | |
5586 | #ifdef TRAMPOLINE_ALIGNMENT | |
5587 | /* Round address up to desired boundary. */ | |
5588 | rtx temp = gen_reg_rtx (Pmode); | |
5589 | temp = expand_binop (Pmode, add_optab, tramp, | |
b02ab63a | 5590 | GEN_INT (TRAMPOLINE_ALIGNMENT / BITS_PER_UNIT - 1), |
6f086dfc RS |
5591 | temp, 0, OPTAB_LIB_WIDEN); |
5592 | tramp = expand_binop (Pmode, and_optab, temp, | |
718fe406 | 5593 | GEN_INT (-TRAMPOLINE_ALIGNMENT / BITS_PER_UNIT), |
6f086dfc RS |
5594 | temp, 0, OPTAB_LIB_WIDEN); |
5595 | #endif | |
5596 | return tramp; | |
5597 | } | |
5598 | \f | |
b2a59b15 MS |
5599 | /* Put all this function's BLOCK nodes including those that are chained |
5600 | onto the first block into a vector, and return it. | |
467456d0 RS |
5601 | Also store in each NOTE for the beginning or end of a block |
5602 | the index of that block in the vector. | |
b2a59b15 | 5603 | The arguments are BLOCK, the chain of top-level blocks of the function, |
467456d0 RS |
5604 | and INSNS, the insn chain of the function. */ |
5605 | ||
1a4450c7 | 5606 | void |
116eebd6 | 5607 | identify_blocks () |
467456d0 | 5608 | { |
fc289cd1 | 5609 | int n_blocks; |
0a1c58a2 | 5610 | tree *block_vector, *last_block_vector; |
1a4450c7 | 5611 | tree *block_stack; |
116eebd6 | 5612 | tree block = DECL_INITIAL (current_function_decl); |
467456d0 | 5613 | |
b2a59b15 | 5614 | if (block == 0) |
1a4450c7 | 5615 | return; |
fc289cd1 | 5616 | |
1a4450c7 MM |
5617 | /* Fill the BLOCK_VECTOR with all of the BLOCKs in this function, in |
5618 | depth-first order. */ | |
18c038b9 | 5619 | block_vector = get_block_vector (block, &n_blocks); |
4da896b2 | 5620 | block_stack = (tree *) xmalloc (n_blocks * sizeof (tree)); |
1a4450c7 | 5621 | |
718fe406 | 5622 | last_block_vector = identify_blocks_1 (get_insns (), |
116eebd6 | 5623 | block_vector + 1, |
718fe406 | 5624 | block_vector + n_blocks, |
116eebd6 | 5625 | block_stack); |
0a1c58a2 JL |
5626 | |
5627 | /* If we didn't use all of the subblocks, we've misplaced block notes. */ | |
5628 | /* ??? This appears to happen all the time. Latent bugs elsewhere? */ | |
5629 | if (0 && last_block_vector != block_vector + n_blocks) | |
5630 | abort (); | |
5631 | ||
5632 | free (block_vector); | |
5633 | free (block_stack); | |
5634 | } | |
5635 | ||
5636 | /* Subroutine of identify_blocks. Do the block substitution on the | |
5637 | insn chain beginning with INSNS. Recurse for CALL_PLACEHOLDER chains. | |
5638 | ||
5639 | BLOCK_STACK is pushed and popped for each BLOCK_BEGIN/BLOCK_END pair. | |
5640 | BLOCK_VECTOR is incremented for each block seen. */ | |
5641 | ||
5642 | static tree * | |
5643 | identify_blocks_1 (insns, block_vector, end_block_vector, orig_block_stack) | |
5644 | rtx insns; | |
5645 | tree *block_vector; | |
5646 | tree *end_block_vector; | |
5647 | tree *orig_block_stack; | |
5648 | { | |
5649 | rtx insn; | |
5650 | tree *block_stack = orig_block_stack; | |
5651 | ||
467456d0 | 5652 | for (insn = insns; insn; insn = NEXT_INSN (insn)) |
0a1c58a2 JL |
5653 | { |
5654 | if (GET_CODE (insn) == NOTE) | |
5655 | { | |
5656 | if (NOTE_LINE_NUMBER (insn) == NOTE_INSN_BLOCK_BEG) | |
5657 | { | |
5658 | tree b; | |
1a4450c7 | 5659 | |
0a1c58a2 JL |
5660 | /* If there are more block notes than BLOCKs, something |
5661 | is badly wrong. */ | |
5662 | if (block_vector == end_block_vector) | |
5663 | abort (); | |
e6fd097e | 5664 | |
0a1c58a2 JL |
5665 | b = *block_vector++; |
5666 | NOTE_BLOCK (insn) = b; | |
5667 | *block_stack++ = b; | |
5668 | } | |
5669 | else if (NOTE_LINE_NUMBER (insn) == NOTE_INSN_BLOCK_END) | |
5670 | { | |
5671 | /* If there are more NOTE_INSN_BLOCK_ENDs than | |
5672 | NOTE_INSN_BLOCK_BEGs, something is badly wrong. */ | |
5673 | if (block_stack == orig_block_stack) | |
5674 | abort (); | |
e6fd097e | 5675 | |
0a1c58a2 JL |
5676 | NOTE_BLOCK (insn) = *--block_stack; |
5677 | } | |
718fe406 | 5678 | } |
0a1c58a2 JL |
5679 | else if (GET_CODE (insn) == CALL_INSN |
5680 | && GET_CODE (PATTERN (insn)) == CALL_PLACEHOLDER) | |
5681 | { | |
5682 | rtx cp = PATTERN (insn); | |
5683 | ||
718fe406 KH |
5684 | block_vector = identify_blocks_1 (XEXP (cp, 0), block_vector, |
5685 | end_block_vector, block_stack); | |
0a1c58a2 JL |
5686 | if (XEXP (cp, 1)) |
5687 | block_vector = identify_blocks_1 (XEXP (cp, 1), block_vector, | |
5688 | end_block_vector, block_stack); | |
5689 | if (XEXP (cp, 2)) | |
5690 | block_vector = identify_blocks_1 (XEXP (cp, 2), block_vector, | |
5691 | end_block_vector, block_stack); | |
5692 | } | |
5693 | } | |
467456d0 | 5694 | |
0a1c58a2 JL |
5695 | /* If there are more NOTE_INSN_BLOCK_BEGINs than NOTE_INSN_BLOCK_ENDs, |
5696 | something is badly wrong. */ | |
5697 | if (block_stack != orig_block_stack) | |
5698 | abort (); | |
5699 | ||
5700 | return block_vector; | |
467456d0 RS |
5701 | } |
5702 | ||
116eebd6 | 5703 | /* Identify BLOCKs referenced by more than one |
718fe406 | 5704 | NOTE_INSN_BLOCK_{BEG,END}, and create duplicate blocks. */ |
467456d0 | 5705 | |
116eebd6 MM |
5706 | void |
5707 | reorder_blocks () | |
467456d0 | 5708 | { |
116eebd6 | 5709 | tree block = DECL_INITIAL (current_function_decl); |
18c038b9 | 5710 | varray_type block_stack; |
467456d0 | 5711 | |
1a4450c7 | 5712 | if (block == NULL_TREE) |
116eebd6 | 5713 | return; |
fc289cd1 | 5714 | |
18c038b9 MM |
5715 | VARRAY_TREE_INIT (block_stack, 10, "block_stack"); |
5716 | ||
116eebd6 MM |
5717 | /* Prune the old trees away, so that they don't get in the way. */ |
5718 | BLOCK_SUBBLOCKS (block) = NULL_TREE; | |
5719 | BLOCK_CHAIN (block) = NULL_TREE; | |
fc289cd1 | 5720 | |
116eebd6 | 5721 | reorder_blocks_1 (get_insns (), block, &block_stack); |
467456d0 | 5722 | |
718fe406 | 5723 | BLOCK_SUBBLOCKS (block) = blocks_nreverse (BLOCK_SUBBLOCKS (block)); |
18c038b9 MM |
5724 | |
5725 | VARRAY_FREE (block_stack); | |
467456d0 RS |
5726 | } |
5727 | ||
0a1c58a2 JL |
5728 | /* Helper function for reorder_blocks. Process the insn chain beginning |
5729 | at INSNS. Recurse for CALL_PLACEHOLDER insns. */ | |
5730 | ||
5731 | static void | |
5732 | reorder_blocks_1 (insns, current_block, p_block_stack) | |
5733 | rtx insns; | |
5734 | tree current_block; | |
5735 | varray_type *p_block_stack; | |
5736 | { | |
5737 | rtx insn; | |
5738 | ||
5739 | for (insn = insns; insn; insn = NEXT_INSN (insn)) | |
5740 | { | |
5741 | if (GET_CODE (insn) == NOTE) | |
5742 | { | |
5743 | if (NOTE_LINE_NUMBER (insn) == NOTE_INSN_BLOCK_BEG) | |
5744 | { | |
5745 | tree block = NOTE_BLOCK (insn); | |
5746 | /* If we have seen this block before, copy it. */ | |
5747 | if (TREE_ASM_WRITTEN (block)) | |
5748 | { | |
5749 | block = copy_node (block); | |
5750 | NOTE_BLOCK (insn) = block; | |
5751 | } | |
5752 | BLOCK_SUBBLOCKS (block) = 0; | |
5753 | TREE_ASM_WRITTEN (block) = 1; | |
718fe406 | 5754 | BLOCK_SUPERCONTEXT (block) = current_block; |
0a1c58a2 JL |
5755 | BLOCK_CHAIN (block) = BLOCK_SUBBLOCKS (current_block); |
5756 | BLOCK_SUBBLOCKS (current_block) = block; | |
5757 | current_block = block; | |
5758 | VARRAY_PUSH_TREE (*p_block_stack, block); | |
5759 | } | |
5760 | else if (NOTE_LINE_NUMBER (insn) == NOTE_INSN_BLOCK_END) | |
5761 | { | |
5762 | NOTE_BLOCK (insn) = VARRAY_TOP_TREE (*p_block_stack); | |
5763 | VARRAY_POP (*p_block_stack); | |
5764 | BLOCK_SUBBLOCKS (current_block) | |
5765 | = blocks_nreverse (BLOCK_SUBBLOCKS (current_block)); | |
5766 | current_block = BLOCK_SUPERCONTEXT (current_block); | |
5767 | } | |
5768 | } | |
5769 | else if (GET_CODE (insn) == CALL_INSN | |
5770 | && GET_CODE (PATTERN (insn)) == CALL_PLACEHOLDER) | |
5771 | { | |
5772 | rtx cp = PATTERN (insn); | |
5773 | reorder_blocks_1 (XEXP (cp, 0), current_block, p_block_stack); | |
5774 | if (XEXP (cp, 1)) | |
5775 | reorder_blocks_1 (XEXP (cp, 1), current_block, p_block_stack); | |
5776 | if (XEXP (cp, 2)) | |
5777 | reorder_blocks_1 (XEXP (cp, 2), current_block, p_block_stack); | |
5778 | } | |
5779 | } | |
5780 | } | |
5781 | ||
467456d0 RS |
5782 | /* Reverse the order of elements in the chain T of blocks, |
5783 | and return the new head of the chain (old last element). */ | |
5784 | ||
5785 | static tree | |
5786 | blocks_nreverse (t) | |
5787 | tree t; | |
5788 | { | |
5789 | register tree prev = 0, decl, next; | |
5790 | for (decl = t; decl; decl = next) | |
5791 | { | |
5792 | next = BLOCK_CHAIN (decl); | |
5793 | BLOCK_CHAIN (decl) = prev; | |
5794 | prev = decl; | |
5795 | } | |
5796 | return prev; | |
5797 | } | |
5798 | ||
18c038b9 MM |
5799 | /* Count the subblocks of the list starting with BLOCK. If VECTOR is |
5800 | non-NULL, list them all into VECTOR, in a depth-first preorder | |
5801 | traversal of the block tree. Also clear TREE_ASM_WRITTEN in all | |
b2a59b15 | 5802 | blocks. */ |
467456d0 RS |
5803 | |
5804 | static int | |
5805 | all_blocks (block, vector) | |
5806 | tree block; | |
5807 | tree *vector; | |
5808 | { | |
b2a59b15 MS |
5809 | int n_blocks = 0; |
5810 | ||
5811 | while (block) | |
5812 | { | |
5813 | TREE_ASM_WRITTEN (block) = 0; | |
5814 | ||
5815 | /* Record this block. */ | |
5816 | if (vector) | |
5817 | vector[n_blocks] = block; | |
5818 | ||
5819 | ++n_blocks; | |
718fe406 | 5820 | |
b2a59b15 MS |
5821 | /* Record the subblocks, and their subblocks... */ |
5822 | n_blocks += all_blocks (BLOCK_SUBBLOCKS (block), | |
5823 | vector ? vector + n_blocks : 0); | |
5824 | block = BLOCK_CHAIN (block); | |
5825 | } | |
467456d0 RS |
5826 | |
5827 | return n_blocks; | |
5828 | } | |
18c038b9 MM |
5829 | |
5830 | /* Return a vector containing all the blocks rooted at BLOCK. The | |
5831 | number of elements in the vector is stored in N_BLOCKS_P. The | |
5832 | vector is dynamically allocated; it is the caller's responsibility | |
5833 | to call `free' on the pointer returned. */ | |
718fe406 | 5834 | |
18c038b9 MM |
5835 | static tree * |
5836 | get_block_vector (block, n_blocks_p) | |
5837 | tree block; | |
5838 | int *n_blocks_p; | |
5839 | { | |
5840 | tree *block_vector; | |
5841 | ||
5842 | *n_blocks_p = all_blocks (block, NULL); | |
5843 | block_vector = (tree *) xmalloc (*n_blocks_p * sizeof (tree)); | |
5844 | all_blocks (block, block_vector); | |
5845 | ||
5846 | return block_vector; | |
5847 | } | |
5848 | ||
5849 | static int next_block_index = 2; | |
5850 | ||
5851 | /* Set BLOCK_NUMBER for all the blocks in FN. */ | |
5852 | ||
5853 | void | |
5854 | number_blocks (fn) | |
5855 | tree fn; | |
5856 | { | |
5857 | int i; | |
5858 | int n_blocks; | |
5859 | tree *block_vector; | |
5860 | ||
5861 | /* For SDB and XCOFF debugging output, we start numbering the blocks | |
5862 | from 1 within each function, rather than keeping a running | |
5863 | count. */ | |
5864 | #if defined (SDB_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO) | |
b0e3a658 RK |
5865 | if (write_symbols == SDB_DEBUG || write_symbols == XCOFF_DEBUG) |
5866 | next_block_index = 1; | |
18c038b9 MM |
5867 | #endif |
5868 | ||
5869 | block_vector = get_block_vector (DECL_INITIAL (fn), &n_blocks); | |
5870 | ||
5871 | /* The top-level BLOCK isn't numbered at all. */ | |
5872 | for (i = 1; i < n_blocks; ++i) | |
5873 | /* We number the blocks from two. */ | |
5874 | BLOCK_NUMBER (block_vector[i]) = next_block_index++; | |
5875 | ||
5876 | free (block_vector); | |
5877 | ||
5878 | return; | |
5879 | } | |
467456d0 | 5880 | \f |
b384405b BS |
5881 | /* Allocate a function structure and reset its contents to the defaults. */ |
5882 | static void | |
5883 | prepare_function_start () | |
6f086dfc | 5884 | { |
01d939e8 | 5885 | cfun = (struct function *) xcalloc (1, sizeof (struct function)); |
e2ecd91c | 5886 | |
6f086dfc | 5887 | init_stmt_for_function (); |
fa51b01b | 5888 | init_eh_for_function (); |
6f086dfc RS |
5889 | |
5890 | cse_not_expected = ! optimize; | |
5891 | ||
5892 | /* Caller save not needed yet. */ | |
5893 | caller_save_needed = 0; | |
5894 | ||
5895 | /* No stack slots have been made yet. */ | |
5896 | stack_slot_list = 0; | |
5897 | ||
b384405b BS |
5898 | current_function_has_nonlocal_label = 0; |
5899 | current_function_has_nonlocal_goto = 0; | |
5900 | ||
6f086dfc | 5901 | /* There is no stack slot for handling nonlocal gotos. */ |
ba716ac9 | 5902 | nonlocal_goto_handler_slots = 0; |
6f086dfc RS |
5903 | nonlocal_goto_stack_level = 0; |
5904 | ||
5905 | /* No labels have been declared for nonlocal use. */ | |
5906 | nonlocal_labels = 0; | |
e881bb1b | 5907 | nonlocal_goto_handler_labels = 0; |
6f086dfc RS |
5908 | |
5909 | /* No function calls so far in this function. */ | |
5910 | function_call_count = 0; | |
5911 | ||
5912 | /* No parm regs have been allocated. | |
5913 | (This is important for output_inline_function.) */ | |
5914 | max_parm_reg = LAST_VIRTUAL_REGISTER + 1; | |
5915 | ||
5916 | /* Initialize the RTL mechanism. */ | |
5917 | init_emit (); | |
5918 | ||
5919 | /* Initialize the queue of pending postincrement and postdecrements, | |
5920 | and some other info in expr.c. */ | |
5921 | init_expr (); | |
718fe406 | 5922 | |
6f086dfc RS |
5923 | /* We haven't done register allocation yet. */ |
5924 | reg_renumber = 0; | |
5925 | ||
01d939e8 | 5926 | init_varasm_status (cfun); |
6f086dfc | 5927 | |
e2ecd91c | 5928 | /* Clear out data used for inlining. */ |
01d939e8 BS |
5929 | cfun->inlinable = 0; |
5930 | cfun->original_decl_initial = 0; | |
718fe406 | 5931 | cfun->original_arg_vector = 0; |
e2ecd91c | 5932 | |
c2f8b491 | 5933 | #ifdef STACK_BOUNDARY |
c487e484 | 5934 | cfun->stack_alignment_needed = STACK_BOUNDARY; |
c2f8b491 | 5935 | cfun->preferred_stack_boundary = STACK_BOUNDARY; |
c487e484 RE |
5936 | #else |
5937 | cfun->stack_alignment_needed = 0; | |
0a1c58a2 | 5938 | cfun->preferred_stack_boundary = 0; |
c2f8b491 | 5939 | #endif |
a0871656 | 5940 | |
6f086dfc RS |
5941 | /* Set if a call to setjmp is seen. */ |
5942 | current_function_calls_setjmp = 0; | |
5943 | ||
5944 | /* Set if a call to longjmp is seen. */ | |
5945 | current_function_calls_longjmp = 0; | |
5946 | ||
5947 | current_function_calls_alloca = 0; | |
6f086dfc | 5948 | current_function_contains_functions = 0; |
54ff41b7 | 5949 | current_function_is_leaf = 0; |
fb13d4d0 | 5950 | current_function_nothrow = 0; |
fdb8a883 | 5951 | current_function_sp_is_unchanging = 0; |
54ff41b7 | 5952 | current_function_uses_only_leaf_regs = 0; |
acd693d1 | 5953 | current_function_has_computed_jump = 0; |
173cd503 | 5954 | current_function_is_thunk = 0; |
6f086dfc RS |
5955 | |
5956 | current_function_returns_pcc_struct = 0; | |
5957 | current_function_returns_struct = 0; | |
5958 | current_function_epilogue_delay_list = 0; | |
5959 | current_function_uses_const_pool = 0; | |
5960 | current_function_uses_pic_offset_table = 0; | |
aeb302bb | 5961 | current_function_cannot_inline = 0; |
6f086dfc RS |
5962 | |
5963 | /* We have not yet needed to make a label to jump to for tail-recursion. */ | |
5964 | tail_recursion_label = 0; | |
5965 | ||
5966 | /* We haven't had a need to make a save area for ap yet. */ | |
6f086dfc RS |
5967 | arg_pointer_save_area = 0; |
5968 | ||
5969 | /* No stack slots allocated yet. */ | |
5970 | frame_offset = 0; | |
5971 | ||
5972 | /* No SAVE_EXPRs in this function yet. */ | |
5973 | save_expr_regs = 0; | |
5974 | ||
5975 | /* No RTL_EXPRs in this function yet. */ | |
5976 | rtl_expr_chain = 0; | |
5977 | ||
bc0ebdf9 RK |
5978 | /* Set up to allocate temporaries. */ |
5979 | init_temp_slots (); | |
6f086dfc | 5980 | |
b384405b BS |
5981 | /* Indicate that we need to distinguish between the return value of the |
5982 | present function and the return value of a function being called. */ | |
5983 | rtx_equal_function_value_matters = 1; | |
5984 | ||
5985 | /* Indicate that we have not instantiated virtual registers yet. */ | |
5986 | virtuals_instantiated = 0; | |
5987 | ||
1b3d8f8a GK |
5988 | /* Indicate that we want CONCATs now. */ |
5989 | generating_concat_p = 1; | |
5990 | ||
b384405b BS |
5991 | /* Indicate we have no need of a frame pointer yet. */ |
5992 | frame_pointer_needed = 0; | |
5993 | ||
5994 | /* By default assume not varargs or stdarg. */ | |
5995 | current_function_varargs = 0; | |
5996 | current_function_stdarg = 0; | |
6f086dfc | 5997 | |
d9a98e1a RK |
5998 | /* We haven't made any trampolines for this function yet. */ |
5999 | trampoline_list = 0; | |
6000 | ||
6f086dfc RS |
6001 | init_pending_stack_adjust (); |
6002 | inhibit_defer_pop = 0; | |
6003 | ||
6004 | current_function_outgoing_args_size = 0; | |
36edd3cc | 6005 | |
0a8a198c | 6006 | if (init_lang_status) |
01d939e8 | 6007 | (*init_lang_status) (cfun); |
36edd3cc | 6008 | if (init_machine_status) |
01d939e8 | 6009 | (*init_machine_status) (cfun); |
b384405b BS |
6010 | } |
6011 | ||
6012 | /* Initialize the rtl expansion mechanism so that we can do simple things | |
6013 | like generate sequences. This is used to provide a context during global | |
6014 | initialization of some passes. */ | |
6015 | void | |
6016 | init_dummy_function_start () | |
6017 | { | |
6018 | prepare_function_start (); | |
6019 | } | |
6020 | ||
6021 | /* Generate RTL for the start of the function SUBR (a FUNCTION_DECL tree node) | |
6022 | and initialize static variables for generating RTL for the statements | |
6023 | of the function. */ | |
6024 | ||
6025 | void | |
6026 | init_function_start (subr, filename, line) | |
6027 | tree subr; | |
36244024 | 6028 | const char *filename; |
b384405b BS |
6029 | int line; |
6030 | { | |
6031 | prepare_function_start (); | |
6032 | ||
6033 | /* Remember this function for later. */ | |
01d939e8 BS |
6034 | cfun->next_global = all_functions; |
6035 | all_functions = cfun; | |
718fe406 | 6036 | |
b384405b | 6037 | current_function_name = (*decl_printable_name) (subr, 2); |
01d939e8 | 6038 | cfun->decl = subr; |
b384405b BS |
6039 | |
6040 | /* Nonzero if this is a nested function that uses a static chain. */ | |
6041 | ||
6042 | current_function_needs_context | |
6043 | = (decl_function_context (current_function_decl) != 0 | |
6044 | && ! DECL_NO_STATIC_CHAIN (current_function_decl)); | |
6045 | ||
6046 | /* Within function body, compute a type's size as soon it is laid out. */ | |
6047 | immediate_size_expand++; | |
6f086dfc | 6048 | |
6f086dfc | 6049 | /* Prevent ever trying to delete the first instruction of a function. |
b274104c | 6050 | Also tell final how to output a linenum before the function prologue. |
718fe406 | 6051 | Note linenums could be missing, e.g. when compiling a Java .class file. */ |
b274104c PB |
6052 | if (line > 0) |
6053 | emit_line_note (filename, line); | |
6f086dfc RS |
6054 | |
6055 | /* Make sure first insn is a note even if we don't want linenums. | |
6056 | This makes sure the first insn will never be deleted. | |
6057 | Also, final expects a note to appear there. */ | |
5f4f0e22 | 6058 | emit_note (NULL_PTR, NOTE_INSN_DELETED); |
6f086dfc RS |
6059 | |
6060 | /* Set flags used by final.c. */ | |
6061 | if (aggregate_value_p (DECL_RESULT (subr))) | |
6062 | { | |
6063 | #ifdef PCC_STATIC_STRUCT_RETURN | |
1b8297c1 | 6064 | current_function_returns_pcc_struct = 1; |
6f086dfc | 6065 | #endif |
1b8297c1 | 6066 | current_function_returns_struct = 1; |
6f086dfc RS |
6067 | } |
6068 | ||
6069 | /* Warn if this value is an aggregate type, | |
6070 | regardless of which calling convention we are using for it. */ | |
6071 | if (warn_aggregate_return | |
05e3bdb9 | 6072 | && AGGREGATE_TYPE_P (TREE_TYPE (DECL_RESULT (subr)))) |
6f086dfc RS |
6073 | warning ("function returns an aggregate"); |
6074 | ||
6075 | current_function_returns_pointer | |
8eda074c | 6076 | = POINTER_TYPE_P (TREE_TYPE (DECL_RESULT (subr))); |
49ad7cfa | 6077 | } |
5c7675e9 | 6078 | |
49ad7cfa BS |
6079 | /* Make sure all values used by the optimization passes have sane |
6080 | defaults. */ | |
6081 | void | |
6082 | init_function_for_compilation () | |
6083 | { | |
6084 | reg_renumber = 0; | |
0a1c58a2 | 6085 | |
5c7675e9 | 6086 | /* No prologue/epilogue insns yet. */ |
0a1c58a2 JL |
6087 | VARRAY_GROW (prologue, 0); |
6088 | VARRAY_GROW (epilogue, 0); | |
6089 | VARRAY_GROW (sibcall_epilogue, 0); | |
6f086dfc RS |
6090 | } |
6091 | ||
6092 | /* Indicate that the current function uses extra args | |
6093 | not explicitly mentioned in the argument list in any fashion. */ | |
6094 | ||
6095 | void | |
6096 | mark_varargs () | |
6097 | { | |
6098 | current_function_varargs = 1; | |
6099 | } | |
6100 | ||
6101 | /* Expand a call to __main at the beginning of a possible main function. */ | |
6102 | ||
e2fd1d94 JM |
6103 | #if defined(INIT_SECTION_ASM_OP) && !defined(INVOKE__main) |
6104 | #undef HAS_INIT_SECTION | |
6105 | #define HAS_INIT_SECTION | |
6106 | #endif | |
6107 | ||
6f086dfc RS |
6108 | void |
6109 | expand_main_function () | |
6110 | { | |
e2fd1d94 | 6111 | #if !defined (HAS_INIT_SECTION) |
b93a436e JL |
6112 | emit_library_call (gen_rtx_SYMBOL_REF (Pmode, NAME__MAIN), 0, |
6113 | VOIDmode, 0); | |
e2fd1d94 | 6114 | #endif /* not HAS_INIT_SECTION */ |
6f086dfc RS |
6115 | } |
6116 | \f | |
c20bf1f3 JB |
6117 | extern struct obstack permanent_obstack; |
6118 | ||
6f086dfc RS |
6119 | /* Start the RTL for a new function, and set variables used for |
6120 | emitting RTL. | |
6121 | SUBR is the FUNCTION_DECL node. | |
6122 | PARMS_HAVE_CLEANUPS is nonzero if there are cleanups associated with | |
6123 | the function's parameters, which must be run at any return statement. */ | |
6124 | ||
6125 | void | |
6126 | expand_function_start (subr, parms_have_cleanups) | |
6127 | tree subr; | |
6128 | int parms_have_cleanups; | |
6129 | { | |
6f086dfc | 6130 | tree tem; |
4e86caed | 6131 | rtx last_ptr = NULL_RTX; |
6f086dfc RS |
6132 | |
6133 | /* Make sure volatile mem refs aren't considered | |
6134 | valid operands of arithmetic insns. */ | |
6135 | init_recog_no_volatile (); | |
6136 | ||
7d384cc0 KR |
6137 | /* Set this before generating any memory accesses. */ |
6138 | current_function_check_memory_usage | |
6139 | = (flag_check_memory_usage | |
6140 | && ! DECL_NO_CHECK_MEMORY_USAGE (current_function_decl)); | |
6141 | ||
07417085 KR |
6142 | current_function_instrument_entry_exit |
6143 | = (flag_instrument_function_entry_exit | |
6144 | && ! DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (subr)); | |
6145 | ||
a157febd GK |
6146 | current_function_limit_stack |
6147 | = (stack_limit_rtx != NULL_RTX && ! DECL_NO_LIMIT_STACK (subr)); | |
6148 | ||
6f086dfc RS |
6149 | /* If function gets a static chain arg, store it in the stack frame. |
6150 | Do this first, so it gets the first stack slot offset. */ | |
6151 | if (current_function_needs_context) | |
3e2481e9 JW |
6152 | { |
6153 | last_ptr = assign_stack_local (Pmode, GET_MODE_SIZE (Pmode), 0); | |
f0c51a1e | 6154 | |
f0c51a1e RK |
6155 | /* Delay copying static chain if it is not a register to avoid |
6156 | conflicts with regs used for parameters. */ | |
f95182a4 ILT |
6157 | if (! SMALL_REGISTER_CLASSES |
6158 | || GET_CODE (static_chain_incoming_rtx) == REG) | |
718fe406 | 6159 | emit_move_insn (last_ptr, static_chain_incoming_rtx); |
3e2481e9 | 6160 | } |
6f086dfc RS |
6161 | |
6162 | /* If the parameters of this function need cleaning up, get a label | |
6163 | for the beginning of the code which executes those cleanups. This must | |
6164 | be done before doing anything with return_label. */ | |
6165 | if (parms_have_cleanups) | |
6166 | cleanup_label = gen_label_rtx (); | |
6167 | else | |
6168 | cleanup_label = 0; | |
6169 | ||
6170 | /* Make the label for return statements to jump to, if this machine | |
6171 | does not have a one-instruction return and uses an epilogue, | |
6172 | or if it returns a structure, or if it has parm cleanups. */ | |
6173 | #ifdef HAVE_return | |
6174 | if (cleanup_label == 0 && HAVE_return | |
07417085 | 6175 | && ! current_function_instrument_entry_exit |
6f086dfc RS |
6176 | && ! current_function_returns_pcc_struct |
6177 | && ! (current_function_returns_struct && ! optimize)) | |
6178 | return_label = 0; | |
6179 | else | |
6180 | return_label = gen_label_rtx (); | |
6181 | #else | |
6182 | return_label = gen_label_rtx (); | |
6183 | #endif | |
6184 | ||
6185 | /* Initialize rtx used to return the value. */ | |
6186 | /* Do this before assign_parms so that we copy the struct value address | |
6187 | before any library calls that assign parms might generate. */ | |
6188 | ||
6189 | /* Decide whether to return the value in memory or in a register. */ | |
6190 | if (aggregate_value_p (DECL_RESULT (subr))) | |
6191 | { | |
6192 | /* Returning something that won't go in a register. */ | |
4acc00bf | 6193 | register rtx value_address = 0; |
6f086dfc RS |
6194 | |
6195 | #ifdef PCC_STATIC_STRUCT_RETURN | |
6196 | if (current_function_returns_pcc_struct) | |
6197 | { | |
6198 | int size = int_size_in_bytes (TREE_TYPE (DECL_RESULT (subr))); | |
6199 | value_address = assemble_static_space (size); | |
6200 | } | |
6201 | else | |
6202 | #endif | |
6203 | { | |
6204 | /* Expect to be passed the address of a place to store the value. | |
6205 | If it is passed as an argument, assign_parms will take care of | |
6206 | it. */ | |
6207 | if (struct_value_incoming_rtx) | |
6208 | { | |
6209 | value_address = gen_reg_rtx (Pmode); | |
6210 | emit_move_insn (value_address, struct_value_incoming_rtx); | |
6211 | } | |
6212 | } | |
6213 | if (value_address) | |
ccdecf58 RK |
6214 | { |
6215 | DECL_RTL (DECL_RESULT (subr)) | |
38a448ca | 6216 | = gen_rtx_MEM (DECL_MODE (DECL_RESULT (subr)), value_address); |
3bdf5ad1 RK |
6217 | set_mem_attributes (DECL_RTL (DECL_RESULT (subr)), |
6218 | DECL_RESULT (subr), 1); | |
ccdecf58 | 6219 | } |
6f086dfc RS |
6220 | } |
6221 | else if (DECL_MODE (DECL_RESULT (subr)) == VOIDmode) | |
6222 | /* If return mode is void, this decl rtl should not be used. */ | |
6223 | DECL_RTL (DECL_RESULT (subr)) = 0; | |
07417085 | 6224 | else if (parms_have_cleanups || current_function_instrument_entry_exit) |
a53e14c0 RK |
6225 | { |
6226 | /* If function will end with cleanup code for parms, | |
6227 | compute the return values into a pseudo reg, | |
6228 | which we will copy into the true return register | |
6229 | after the cleanups are done. */ | |
6230 | ||
6231 | enum machine_mode mode = DECL_MODE (DECL_RESULT (subr)); | |
a5a52dbc | 6232 | |
a53e14c0 RK |
6233 | #ifdef PROMOTE_FUNCTION_RETURN |
6234 | tree type = TREE_TYPE (DECL_RESULT (subr)); | |
6235 | int unsignedp = TREE_UNSIGNED (type); | |
6236 | ||
a5a52dbc | 6237 | mode = promote_mode (type, mode, &unsignedp, 1); |
a53e14c0 RK |
6238 | #endif |
6239 | ||
6240 | DECL_RTL (DECL_RESULT (subr)) = gen_reg_rtx (mode); | |
6241 | } | |
6f086dfc RS |
6242 | else |
6243 | /* Scalar, returned in a register. */ | |
6244 | { | |
6f086dfc | 6245 | DECL_RTL (DECL_RESULT (subr)) |
ab36bd3e | 6246 | = hard_function_value (TREE_TYPE (DECL_RESULT (subr)), subr, 1); |
6f086dfc RS |
6247 | |
6248 | /* Mark this reg as the function's return value. */ | |
6249 | if (GET_CODE (DECL_RTL (DECL_RESULT (subr))) == REG) | |
6250 | { | |
6251 | REG_FUNCTION_VALUE_P (DECL_RTL (DECL_RESULT (subr))) = 1; | |
6252 | /* Needed because we may need to move this to memory | |
6253 | in case it's a named return value whose address is taken. */ | |
a82ad570 | 6254 | DECL_REGISTER (DECL_RESULT (subr)) = 1; |
6f086dfc RS |
6255 | } |
6256 | } | |
6257 | ||
6258 | /* Initialize rtx for parameters and local variables. | |
6259 | In some cases this requires emitting insns. */ | |
6260 | ||
0d1416c6 | 6261 | assign_parms (subr); |
6f086dfc | 6262 | |
f0c51a1e RK |
6263 | /* Copy the static chain now if it wasn't a register. The delay is to |
6264 | avoid conflicts with the parameter passing registers. */ | |
6265 | ||
f95182a4 | 6266 | if (SMALL_REGISTER_CLASSES && current_function_needs_context) |
f0c51a1e RK |
6267 | if (GET_CODE (static_chain_incoming_rtx) != REG) |
6268 | emit_move_insn (last_ptr, static_chain_incoming_rtx); | |
f0c51a1e | 6269 | |
6f086dfc RS |
6270 | /* The following was moved from init_function_start. |
6271 | The move is supposed to make sdb output more accurate. */ | |
6272 | /* Indicate the beginning of the function body, | |
6273 | as opposed to parm setup. */ | |
5f4f0e22 | 6274 | emit_note (NULL_PTR, NOTE_INSN_FUNCTION_BEG); |
6f086dfc | 6275 | |
6f086dfc | 6276 | if (GET_CODE (get_last_insn ()) != NOTE) |
5f4f0e22 | 6277 | emit_note (NULL_PTR, NOTE_INSN_DELETED); |
6f086dfc RS |
6278 | parm_birth_insn = get_last_insn (); |
6279 | ||
6d7306f7 JM |
6280 | context_display = 0; |
6281 | if (current_function_needs_context) | |
ac9e20f0 | 6282 | { |
6d7306f7 JM |
6283 | /* Fetch static chain values for containing functions. */ |
6284 | tem = decl_function_context (current_function_decl); | |
d29c259b RH |
6285 | /* Copy the static chain pointer into a pseudo. If we have |
6286 | small register classes, copy the value from memory if | |
6287 | static_chain_incoming_rtx is a REG. */ | |
6288 | if (tem) | |
6d7306f7 | 6289 | { |
6d7306f7 JM |
6290 | /* If the static chain originally came in a register, put it back |
6291 | there, then move it out in the next insn. The reason for | |
6292 | this peculiar code is to satisfy function integration. */ | |
f95182a4 ILT |
6293 | if (SMALL_REGISTER_CLASSES |
6294 | && GET_CODE (static_chain_incoming_rtx) == REG) | |
6d7306f7 | 6295 | emit_move_insn (static_chain_incoming_rtx, last_ptr); |
6d7306f7 JM |
6296 | last_ptr = copy_to_reg (static_chain_incoming_rtx); |
6297 | } | |
ac9e20f0 | 6298 | |
6d7306f7 JM |
6299 | while (tem) |
6300 | { | |
6301 | tree rtlexp = make_node (RTL_EXPR); | |
6f086dfc | 6302 | |
6d7306f7 JM |
6303 | RTL_EXPR_RTL (rtlexp) = last_ptr; |
6304 | context_display = tree_cons (tem, rtlexp, context_display); | |
6305 | tem = decl_function_context (tem); | |
6306 | if (tem == 0) | |
6307 | break; | |
6308 | /* Chain thru stack frames, assuming pointer to next lexical frame | |
6309 | is found at the place we always store it. */ | |
6f086dfc | 6310 | #ifdef FRAME_GROWS_DOWNWARD |
718fe406 | 6311 | last_ptr = plus_constant (last_ptr, -GET_MODE_SIZE (Pmode)); |
6f086dfc | 6312 | #endif |
3bdf5ad1 RK |
6313 | last_ptr = gen_rtx_MEM (Pmode, memory_address (Pmode, last_ptr)); |
6314 | MEM_ALIAS_SET (last_ptr) = get_frame_alias_set (); | |
6315 | last_ptr = copy_to_reg (last_ptr); | |
6d7306f7 JM |
6316 | |
6317 | /* If we are not optimizing, ensure that we know that this | |
6318 | piece of context is live over the entire function. */ | |
6319 | if (! optimize) | |
38a448ca RH |
6320 | save_expr_regs = gen_rtx_EXPR_LIST (VOIDmode, last_ptr, |
6321 | save_expr_regs); | |
6d7306f7 | 6322 | } |
6f086dfc RS |
6323 | } |
6324 | ||
07417085 KR |
6325 | if (current_function_instrument_entry_exit) |
6326 | { | |
6327 | rtx fun = DECL_RTL (current_function_decl); | |
6328 | if (GET_CODE (fun) == MEM) | |
6329 | fun = XEXP (fun, 0); | |
6330 | else | |
6331 | abort (); | |
6332 | emit_library_call (profile_function_entry_libfunc, 0, VOIDmode, 2, | |
6333 | fun, Pmode, | |
6334 | expand_builtin_return_addr (BUILT_IN_RETURN_ADDRESS, | |
6335 | 0, | |
6336 | hard_frame_pointer_rtx), | |
6337 | Pmode); | |
6338 | } | |
6339 | ||
6f086dfc RS |
6340 | /* After the display initializations is where the tail-recursion label |
6341 | should go, if we end up needing one. Ensure we have a NOTE here | |
6342 | since some things (like trampolines) get placed before this. */ | |
5f4f0e22 | 6343 | tail_recursion_reentry = emit_note (NULL_PTR, NOTE_INSN_DELETED); |
6f086dfc RS |
6344 | |
6345 | /* Evaluate now the sizes of any types declared among the arguments. */ | |
6346 | for (tem = nreverse (get_pending_sizes ()); tem; tem = TREE_CHAIN (tem)) | |
7b05e286 | 6347 | { |
86fa911a RK |
6348 | expand_expr (TREE_VALUE (tem), const0_rtx, VOIDmode, |
6349 | EXPAND_MEMORY_USE_BAD); | |
7b05e286 JW |
6350 | /* Flush the queue in case this parameter declaration has |
6351 | side-effects. */ | |
6352 | emit_queue (); | |
6353 | } | |
6f086dfc RS |
6354 | |
6355 | /* Make sure there is a line number after the function entry setup code. */ | |
6356 | force_next_line_note (); | |
6357 | } | |
6358 | \f | |
49ad7cfa BS |
6359 | /* Undo the effects of init_dummy_function_start. */ |
6360 | void | |
6361 | expand_dummy_function_end () | |
6362 | { | |
6363 | /* End any sequences that failed to be closed due to syntax errors. */ | |
6364 | while (in_sequence_p ()) | |
6365 | end_sequence (); | |
6366 | ||
6367 | /* Outside function body, can't compute type's actual size | |
6368 | until next function's body starts. */ | |
fa51b01b | 6369 | |
01d939e8 BS |
6370 | free_after_parsing (cfun); |
6371 | free_after_compilation (cfun); | |
6372 | free (cfun); | |
6373 | cfun = 0; | |
49ad7cfa BS |
6374 | } |
6375 | ||
c13fde05 RH |
6376 | /* Call DOIT for each hard register used as a return value from |
6377 | the current function. */ | |
bd695e1e RH |
6378 | |
6379 | void | |
c13fde05 RH |
6380 | diddle_return_value (doit, arg) |
6381 | void (*doit) PARAMS ((rtx, void *)); | |
6382 | void *arg; | |
bd695e1e | 6383 | { |
c13fde05 | 6384 | rtx outgoing = current_function_return_rtx; |
5828d725 | 6385 | int pcc; |
c13fde05 RH |
6386 | |
6387 | if (! outgoing) | |
6388 | return; | |
bd695e1e | 6389 | |
5828d725 | 6390 | pcc = (current_function_returns_struct |
718fe406 | 6391 | || current_function_returns_pcc_struct); |
5828d725 RH |
6392 | |
6393 | if ((GET_CODE (outgoing) == REG | |
6394 | && REGNO (outgoing) >= FIRST_PSEUDO_REGISTER) | |
6395 | || pcc) | |
bd695e1e | 6396 | { |
c13fde05 | 6397 | tree type = TREE_TYPE (DECL_RESULT (current_function_decl)); |
5828d725 RH |
6398 | |
6399 | /* A PCC-style return returns a pointer to the memory in which | |
6400 | the structure is stored. */ | |
6401 | if (pcc) | |
6402 | type = build_pointer_type (type); | |
6403 | ||
c13fde05 RH |
6404 | #ifdef FUNCTION_OUTGOING_VALUE |
6405 | outgoing = FUNCTION_OUTGOING_VALUE (type, current_function_decl); | |
6406 | #else | |
6407 | outgoing = FUNCTION_VALUE (type, current_function_decl); | |
6408 | #endif | |
6409 | /* If this is a BLKmode structure being returned in registers, then use | |
6410 | the mode computed in expand_return. */ | |
6411 | if (GET_MODE (outgoing) == BLKmode) | |
3e4eac3f | 6412 | PUT_MODE (outgoing, GET_MODE (current_function_return_rtx)); |
5828d725 | 6413 | REG_FUNCTION_VALUE_P (outgoing) = 1; |
c13fde05 | 6414 | } |
bd695e1e | 6415 | |
c13fde05 RH |
6416 | if (GET_CODE (outgoing) == REG) |
6417 | (*doit) (outgoing, arg); | |
6418 | else if (GET_CODE (outgoing) == PARALLEL) | |
6419 | { | |
6420 | int i; | |
bd695e1e | 6421 | |
c13fde05 RH |
6422 | for (i = 0; i < XVECLEN (outgoing, 0); i++) |
6423 | { | |
6424 | rtx x = XEXP (XVECEXP (outgoing, 0, i), 0); | |
6425 | ||
6426 | if (GET_CODE (x) == REG && REGNO (x) < FIRST_PSEUDO_REGISTER) | |
6427 | (*doit) (x, arg); | |
bd695e1e RH |
6428 | } |
6429 | } | |
6430 | } | |
6431 | ||
c13fde05 RH |
6432 | static void |
6433 | do_clobber_return_reg (reg, arg) | |
6434 | rtx reg; | |
6435 | void *arg ATTRIBUTE_UNUSED; | |
6436 | { | |
6437 | emit_insn (gen_rtx_CLOBBER (VOIDmode, reg)); | |
6438 | } | |
6439 | ||
6440 | void | |
6441 | clobber_return_register () | |
6442 | { | |
6443 | diddle_return_value (do_clobber_return_reg, NULL); | |
6444 | } | |
6445 | ||
6446 | static void | |
6447 | do_use_return_reg (reg, arg) | |
6448 | rtx reg; | |
6449 | void *arg ATTRIBUTE_UNUSED; | |
6450 | { | |
6451 | emit_insn (gen_rtx_USE (VOIDmode, reg)); | |
6452 | } | |
6453 | ||
6454 | void | |
6455 | use_return_register () | |
6456 | { | |
6457 | diddle_return_value (do_use_return_reg, NULL); | |
6458 | } | |
6459 | ||
6f086dfc | 6460 | /* Generate RTL for the end of the current function. |
718fe406 | 6461 | FILENAME and LINE are the current position in the source file. |
6f086dfc | 6462 | |
980697fd | 6463 | It is up to language-specific callers to do cleanups for parameters-- |
1be07046 | 6464 | or else, supply 1 for END_BINDINGS and we will call expand_end_bindings. */ |
6f086dfc RS |
6465 | |
6466 | void | |
1be07046 | 6467 | expand_function_end (filename, line, end_bindings) |
3b304f5b | 6468 | const char *filename; |
6f086dfc | 6469 | int line; |
1be07046 | 6470 | int end_bindings; |
6f086dfc | 6471 | { |
6f086dfc RS |
6472 | tree link; |
6473 | ||
1e2414db | 6474 | #ifdef TRAMPOLINE_TEMPLATE |
6f086dfc | 6475 | static rtx initial_trampoline; |
1e2414db | 6476 | #endif |
6f086dfc | 6477 | |
49ad7cfa BS |
6478 | finish_expr_for_function (); |
6479 | ||
6f086dfc RS |
6480 | #ifdef NON_SAVING_SETJMP |
6481 | /* Don't put any variables in registers if we call setjmp | |
6482 | on a machine that fails to restore the registers. */ | |
6483 | if (NON_SAVING_SETJMP && current_function_calls_setjmp) | |
6484 | { | |
b88a3142 RK |
6485 | if (DECL_INITIAL (current_function_decl) != error_mark_node) |
6486 | setjmp_protect (DECL_INITIAL (current_function_decl)); | |
6487 | ||
6f086dfc RS |
6488 | setjmp_protect_args (); |
6489 | } | |
6490 | #endif | |
6491 | ||
6492 | /* Save the argument pointer if a save area was made for it. */ | |
6493 | if (arg_pointer_save_area) | |
6494 | { | |
ea0f9a85 JW |
6495 | /* arg_pointer_save_area may not be a valid memory address, so we |
6496 | have to check it and fix it if necessary. */ | |
6497 | rtx seq; | |
6498 | start_sequence (); | |
6499 | emit_move_insn (validize_mem (arg_pointer_save_area), | |
6500 | virtual_incoming_args_rtx); | |
6501 | seq = gen_sequence (); | |
6502 | end_sequence (); | |
6503 | emit_insn_before (seq, tail_recursion_reentry); | |
6f086dfc RS |
6504 | } |
6505 | ||
6506 | /* Initialize any trampolines required by this function. */ | |
6507 | for (link = trampoline_list; link; link = TREE_CHAIN (link)) | |
6508 | { | |
6509 | tree function = TREE_PURPOSE (link); | |
57bed152 | 6510 | rtx context ATTRIBUTE_UNUSED = lookup_static_chain (function); |
6f086dfc | 6511 | rtx tramp = RTL_EXPR_RTL (TREE_VALUE (link)); |
7a87758d | 6512 | #ifdef TRAMPOLINE_TEMPLATE |
1e2414db | 6513 | rtx blktramp; |
7a87758d | 6514 | #endif |
6f086dfc RS |
6515 | rtx seq; |
6516 | ||
1e2414db | 6517 | #ifdef TRAMPOLINE_TEMPLATE |
6f086dfc RS |
6518 | /* First make sure this compilation has a template for |
6519 | initializing trampolines. */ | |
6520 | if (initial_trampoline == 0) | |
86f8eff3 | 6521 | { |
86f8eff3 | 6522 | initial_trampoline |
38a448ca | 6523 | = gen_rtx_MEM (BLKmode, assemble_trampoline_template ()); |
76095e2f RH |
6524 | |
6525 | ggc_add_rtx_root (&initial_trampoline, 1); | |
86f8eff3 | 6526 | } |
1e2414db | 6527 | #endif |
6f086dfc RS |
6528 | |
6529 | /* Generate insns to initialize the trampoline. */ | |
6530 | start_sequence (); | |
1e2414db RK |
6531 | tramp = round_trampoline_addr (XEXP (tramp, 0)); |
6532 | #ifdef TRAMPOLINE_TEMPLATE | |
6533 | blktramp = change_address (initial_trampoline, BLKmode, tramp); | |
6534 | emit_block_move (blktramp, initial_trampoline, | |
6535 | GEN_INT (TRAMPOLINE_SIZE), | |
744bfbfa | 6536 | TRAMPOLINE_ALIGNMENT); |
1e2414db RK |
6537 | #endif |
6538 | INITIALIZE_TRAMPOLINE (tramp, XEXP (DECL_RTL (function), 0), context); | |
6f086dfc RS |
6539 | seq = get_insns (); |
6540 | end_sequence (); | |
6541 | ||
6542 | /* Put those insns at entry to the containing function (this one). */ | |
6543 | emit_insns_before (seq, tail_recursion_reentry); | |
6544 | } | |
6f086dfc | 6545 | |
11044f66 RK |
6546 | /* If we are doing stack checking and this function makes calls, |
6547 | do a stack probe at the start of the function to ensure we have enough | |
6548 | space for another stack frame. */ | |
6549 | if (flag_stack_check && ! STACK_CHECK_BUILTIN) | |
6550 | { | |
6551 | rtx insn, seq; | |
6552 | ||
6553 | for (insn = get_insns (); insn; insn = NEXT_INSN (insn)) | |
6554 | if (GET_CODE (insn) == CALL_INSN) | |
6555 | { | |
6556 | start_sequence (); | |
6557 | probe_stack_range (STACK_CHECK_PROTECT, | |
6558 | GEN_INT (STACK_CHECK_MAX_FRAME_SIZE)); | |
6559 | seq = get_insns (); | |
6560 | end_sequence (); | |
6561 | emit_insns_before (seq, tail_recursion_reentry); | |
6562 | break; | |
6563 | } | |
6564 | } | |
6565 | ||
db8717d9 | 6566 | /* Warn about unused parms if extra warnings were specified. */ |
078721e1 AC |
6567 | /* Either ``-W -Wunused'' or ``-Wunused-parameter'' enables this |
6568 | warning. WARN_UNUSED_PARAMETER is negative when set by | |
718fe406 | 6569 | -Wunused. */ |
078721e1 AC |
6570 | if (warn_unused_parameter > 0 |
6571 | || (warn_unused_parameter < 0 && extra_warnings)) | |
6f086dfc | 6572 | { |
db8717d9 | 6573 | tree decl; |
6f086dfc RS |
6574 | |
6575 | for (decl = DECL_ARGUMENTS (current_function_decl); | |
6576 | decl; decl = TREE_CHAIN (decl)) | |
497dc802 JM |
6577 | if (! TREE_USED (decl) && TREE_CODE (decl) == PARM_DECL |
6578 | && DECL_NAME (decl) && ! DECL_ARTIFICIAL (decl)) | |
6f086dfc RS |
6579 | warning_with_decl (decl, "unused parameter `%s'"); |
6580 | } | |
6f086dfc RS |
6581 | |
6582 | /* Delete handlers for nonlocal gotos if nothing uses them. */ | |
ba716ac9 BS |
6583 | if (nonlocal_goto_handler_slots != 0 |
6584 | && ! current_function_has_nonlocal_label) | |
6f086dfc RS |
6585 | delete_handlers (); |
6586 | ||
6587 | /* End any sequences that failed to be closed due to syntax errors. */ | |
6588 | while (in_sequence_p ()) | |
5f4f0e22 | 6589 | end_sequence (); |
6f086dfc RS |
6590 | |
6591 | /* Outside function body, can't compute type's actual size | |
6592 | until next function's body starts. */ | |
6593 | immediate_size_expand--; | |
6594 | ||
6f086dfc RS |
6595 | clear_pending_stack_adjust (); |
6596 | do_pending_stack_adjust (); | |
6597 | ||
6598 | /* Mark the end of the function body. | |
6599 | If control reaches this insn, the function can drop through | |
6600 | without returning a value. */ | |
5f4f0e22 | 6601 | emit_note (NULL_PTR, NOTE_INSN_FUNCTION_END); |
6f086dfc | 6602 | |
82e415a3 DE |
6603 | /* Must mark the last line number note in the function, so that the test |
6604 | coverage code can avoid counting the last line twice. This just tells | |
6605 | the code to ignore the immediately following line note, since there | |
6606 | already exists a copy of this note somewhere above. This line number | |
6607 | note is still needed for debugging though, so we can't delete it. */ | |
6608 | if (flag_test_coverage) | |
b3b42a4d | 6609 | emit_note (NULL_PTR, NOTE_INSN_REPEATED_LINE_NUMBER); |
82e415a3 | 6610 | |
6f086dfc RS |
6611 | /* Output a linenumber for the end of the function. |
6612 | SDB depends on this. */ | |
6613 | emit_line_note_force (filename, line); | |
6614 | ||
6615 | /* Output the label for the actual return from the function, | |
6616 | if one is expected. This happens either because a function epilogue | |
6617 | is used instead of a return instruction, or because a return was done | |
6618 | with a goto in order to run local cleanups, or because of pcc-style | |
6619 | structure returning. */ | |
6620 | ||
6621 | if (return_label) | |
bd695e1e | 6622 | { |
b313a0fe RH |
6623 | rtx before, after; |
6624 | ||
bd695e1e RH |
6625 | /* Before the return label, clobber the return registers so that |
6626 | they are not propogated live to the rest of the function. This | |
6627 | can only happen with functions that drop through; if there had | |
6628 | been a return statement, there would have either been a return | |
6629 | rtx, or a jump to the return label. */ | |
b313a0fe RH |
6630 | |
6631 | before = get_last_insn (); | |
c13fde05 | 6632 | clobber_return_register (); |
b313a0fe RH |
6633 | after = get_last_insn (); |
6634 | ||
6635 | if (before != after) | |
6636 | cfun->x_clobber_return_insn = after; | |
bd695e1e RH |
6637 | |
6638 | emit_label (return_label); | |
6639 | } | |
6f086dfc | 6640 | |
1be07046 RS |
6641 | /* C++ uses this. */ |
6642 | if (end_bindings) | |
6643 | expand_end_bindings (0, 0, 0); | |
6644 | ||
e5a1e0e8 MS |
6645 | /* Now handle any leftover exception regions that may have been |
6646 | created for the parameters. */ | |
6647 | { | |
6648 | rtx last = get_last_insn (); | |
6649 | rtx label; | |
6650 | ||
6651 | expand_leftover_cleanups (); | |
6652 | ||
1e4ceb6f MM |
6653 | /* If there are any catch_clauses remaining, output them now. */ |
6654 | emit_insns (catch_clauses); | |
c14f7160 | 6655 | catch_clauses = catch_clauses_last = NULL_RTX; |
e5a1e0e8 MS |
6656 | /* If the above emitted any code, may sure we jump around it. */ |
6657 | if (last != get_last_insn ()) | |
6658 | { | |
6659 | label = gen_label_rtx (); | |
6660 | last = emit_jump_insn_after (gen_jump (label), last); | |
6661 | last = emit_barrier_after (last); | |
6662 | emit_label (label); | |
6663 | } | |
6664 | } | |
6665 | ||
07417085 KR |
6666 | if (current_function_instrument_entry_exit) |
6667 | { | |
6668 | rtx fun = DECL_RTL (current_function_decl); | |
6669 | if (GET_CODE (fun) == MEM) | |
6670 | fun = XEXP (fun, 0); | |
6671 | else | |
6672 | abort (); | |
6673 | emit_library_call (profile_function_exit_libfunc, 0, VOIDmode, 2, | |
6674 | fun, Pmode, | |
6675 | expand_builtin_return_addr (BUILT_IN_RETURN_ADDRESS, | |
6676 | 0, | |
6677 | hard_frame_pointer_rtx), | |
6678 | Pmode); | |
6679 | } | |
6680 | ||
6f086dfc RS |
6681 | /* If we had calls to alloca, and this machine needs |
6682 | an accurate stack pointer to exit the function, | |
6683 | insert some code to save and restore the stack pointer. */ | |
6684 | #ifdef EXIT_IGNORE_STACK | |
6685 | if (! EXIT_IGNORE_STACK) | |
6686 | #endif | |
6687 | if (current_function_calls_alloca) | |
6688 | { | |
59257ff7 RK |
6689 | rtx tem = 0; |
6690 | ||
6691 | emit_stack_save (SAVE_FUNCTION, &tem, parm_birth_insn); | |
5f4f0e22 | 6692 | emit_stack_restore (SAVE_FUNCTION, tem, NULL_RTX); |
6f086dfc RS |
6693 | } |
6694 | ||
3e4eac3f RH |
6695 | /* If scalar return value was computed in a pseudo-reg, or was a named |
6696 | return value that got dumped to the stack, copy that to the hard | |
6697 | return register. */ | |
6698 | if (DECL_RTL (DECL_RESULT (current_function_decl)) != 0) | |
6f086dfc | 6699 | { |
3e4eac3f RH |
6700 | tree decl_result = DECL_RESULT (current_function_decl); |
6701 | rtx decl_rtl = DECL_RTL (decl_result); | |
6702 | ||
6703 | if (REG_P (decl_rtl) | |
6704 | ? REGNO (decl_rtl) >= FIRST_PSEUDO_REGISTER | |
6705 | : DECL_REGISTER (decl_result)) | |
6706 | { | |
6707 | rtx real_decl_rtl; | |
6f086dfc RS |
6708 | |
6709 | #ifdef FUNCTION_OUTGOING_VALUE | |
3e4eac3f RH |
6710 | real_decl_rtl = FUNCTION_OUTGOING_VALUE (TREE_TYPE (decl_result), |
6711 | current_function_decl); | |
6f086dfc | 6712 | #else |
3e4eac3f RH |
6713 | real_decl_rtl = FUNCTION_VALUE (TREE_TYPE (decl_result), |
6714 | current_function_decl); | |
6f086dfc | 6715 | #endif |
3e4eac3f RH |
6716 | REG_FUNCTION_VALUE_P (real_decl_rtl) = 1; |
6717 | ||
6718 | /* If this is a BLKmode structure being returned in registers, | |
6719 | then use the mode computed in expand_return. Note that if | |
6720 | decl_rtl is memory, then its mode may have been changed, | |
6721 | but that current_function_return_rtx has not. */ | |
6722 | if (GET_MODE (real_decl_rtl) == BLKmode) | |
6723 | PUT_MODE (real_decl_rtl, GET_MODE (current_function_return_rtx)); | |
6724 | ||
6725 | /* If a named return value dumped decl_return to memory, then | |
6726 | we may need to re-do the PROMOTE_MODE signed/unsigned | |
6727 | extension. */ | |
6728 | if (GET_MODE (real_decl_rtl) != GET_MODE (decl_rtl)) | |
6729 | { | |
6730 | int unsignedp = TREE_UNSIGNED (TREE_TYPE (decl_result)); | |
6731 | ||
6732 | #ifdef PROMOTE_FUNCTION_RETURN | |
6733 | promote_mode (TREE_TYPE (decl_result), GET_MODE (decl_rtl), | |
6734 | &unsignedp, 1); | |
6735 | #endif | |
6736 | ||
6737 | convert_move (real_decl_rtl, decl_rtl, unsignedp); | |
6738 | } | |
6739 | else | |
6740 | emit_move_insn (real_decl_rtl, decl_rtl); | |
6741 | ||
6742 | /* The delay slot scheduler assumes that current_function_return_rtx | |
6743 | holds the hard register containing the return value, not a | |
6744 | temporary pseudo. */ | |
6745 | current_function_return_rtx = real_decl_rtl; | |
6746 | } | |
6f086dfc RS |
6747 | } |
6748 | ||
6749 | /* If returning a structure, arrange to return the address of the value | |
6750 | in a place where debuggers expect to find it. | |
6751 | ||
6752 | If returning a structure PCC style, | |
6753 | the caller also depends on this value. | |
6754 | And current_function_returns_pcc_struct is not necessarily set. */ | |
6755 | if (current_function_returns_struct | |
6756 | || current_function_returns_pcc_struct) | |
6757 | { | |
718fe406 KH |
6758 | rtx value_address = |
6759 | XEXP (DECL_RTL (DECL_RESULT (current_function_decl)), 0); | |
6f086dfc RS |
6760 | tree type = TREE_TYPE (DECL_RESULT (current_function_decl)); |
6761 | #ifdef FUNCTION_OUTGOING_VALUE | |
6762 | rtx outgoing | |
6763 | = FUNCTION_OUTGOING_VALUE (build_pointer_type (type), | |
6764 | current_function_decl); | |
6765 | #else | |
6766 | rtx outgoing | |
6767 | = FUNCTION_VALUE (build_pointer_type (type), | |
6768 | current_function_decl); | |
6769 | #endif | |
6770 | ||
6771 | /* Mark this as a function return value so integrate will delete the | |
6772 | assignment and USE below when inlining this function. */ | |
6773 | REG_FUNCTION_VALUE_P (outgoing) = 1; | |
6774 | ||
6775 | emit_move_insn (outgoing, value_address); | |
6f086dfc RS |
6776 | } |
6777 | ||
c13fde05 RH |
6778 | /* ??? This should no longer be necessary since stupid is no longer with |
6779 | us, but there are some parts of the compiler (eg reload_combine, and | |
6780 | sh mach_dep_reorg) that still try and compute their own lifetime info | |
6781 | instead of using the general framework. */ | |
6782 | use_return_register (); | |
6783 | ||
718fe406 | 6784 | /* If this is an implementation of __throw, do what's necessary to |
71038426 RH |
6785 | communicate between __builtin_eh_return and the epilogue. */ |
6786 | expand_eh_return (); | |
6787 | ||
6f086dfc RS |
6788 | /* Output a return insn if we are using one. |
6789 | Otherwise, let the rtl chain end here, to drop through | |
6790 | into the epilogue. */ | |
6791 | ||
6792 | #ifdef HAVE_return | |
6793 | if (HAVE_return) | |
6794 | { | |
6795 | emit_jump_insn (gen_return ()); | |
6796 | emit_barrier (); | |
6797 | } | |
6798 | #endif | |
6799 | ||
6800 | /* Fix up any gotos that jumped out to the outermost | |
6801 | binding level of the function. | |
6802 | Must follow emitting RETURN_LABEL. */ | |
6803 | ||
6804 | /* If you have any cleanups to do at this point, | |
6805 | and they need to create temporary variables, | |
6806 | then you will lose. */ | |
e15679f8 | 6807 | expand_fixups (get_insns ()); |
6f086dfc | 6808 | } |
bdac5f58 | 6809 | \f |
0a1c58a2 JL |
6810 | /* Extend a vector that records the INSN_UIDs of INSNS (either a |
6811 | sequence or a single insn). */ | |
bdac5f58 | 6812 | |
0a1c58a2 JL |
6813 | static void |
6814 | record_insns (insns, vecp) | |
bdac5f58 | 6815 | rtx insns; |
0a1c58a2 | 6816 | varray_type *vecp; |
bdac5f58 | 6817 | { |
bdac5f58 TW |
6818 | if (GET_CODE (insns) == SEQUENCE) |
6819 | { | |
6820 | int len = XVECLEN (insns, 0); | |
0a1c58a2 JL |
6821 | int i = VARRAY_SIZE (*vecp); |
6822 | ||
6823 | VARRAY_GROW (*vecp, i + len); | |
bdac5f58 | 6824 | while (--len >= 0) |
0a1c58a2 JL |
6825 | { |
6826 | VARRAY_INT (*vecp, i) = INSN_UID (XVECEXP (insns, 0, len)); | |
6827 | ++i; | |
6828 | } | |
bdac5f58 TW |
6829 | } |
6830 | else | |
6831 | { | |
0a1c58a2 JL |
6832 | int i = VARRAY_SIZE (*vecp); |
6833 | VARRAY_GROW (*vecp, i + 1); | |
6834 | VARRAY_INT (*vecp, i) = INSN_UID (insns); | |
bdac5f58 | 6835 | } |
bdac5f58 TW |
6836 | } |
6837 | ||
10914065 | 6838 | /* Determine how many INSN_UIDs in VEC are part of INSN. */ |
bdac5f58 | 6839 | |
10914065 | 6840 | static int |
bdac5f58 TW |
6841 | contains (insn, vec) |
6842 | rtx insn; | |
0a1c58a2 | 6843 | varray_type vec; |
bdac5f58 TW |
6844 | { |
6845 | register int i, j; | |
6846 | ||
6847 | if (GET_CODE (insn) == INSN | |
6848 | && GET_CODE (PATTERN (insn)) == SEQUENCE) | |
6849 | { | |
10914065 | 6850 | int count = 0; |
bdac5f58 | 6851 | for (i = XVECLEN (PATTERN (insn), 0) - 1; i >= 0; i--) |
0a1c58a2 JL |
6852 | for (j = VARRAY_SIZE (vec) - 1; j >= 0; --j) |
6853 | if (INSN_UID (XVECEXP (PATTERN (insn), 0, i)) == VARRAY_INT (vec, j)) | |
10914065 TW |
6854 | count++; |
6855 | return count; | |
bdac5f58 TW |
6856 | } |
6857 | else | |
6858 | { | |
0a1c58a2 JL |
6859 | for (j = VARRAY_SIZE (vec) - 1; j >= 0; --j) |
6860 | if (INSN_UID (insn) == VARRAY_INT (vec, j)) | |
10914065 | 6861 | return 1; |
bdac5f58 TW |
6862 | } |
6863 | return 0; | |
6864 | } | |
5c7675e9 RH |
6865 | |
6866 | int | |
6867 | prologue_epilogue_contains (insn) | |
6868 | rtx insn; | |
6869 | { | |
0a1c58a2 | 6870 | if (contains (insn, prologue)) |
5c7675e9 | 6871 | return 1; |
0a1c58a2 | 6872 | if (contains (insn, epilogue)) |
5c7675e9 RH |
6873 | return 1; |
6874 | return 0; | |
6875 | } | |
bdac5f58 | 6876 | |
0a1c58a2 JL |
6877 | int |
6878 | sibcall_epilogue_contains (insn) | |
718fe406 | 6879 | rtx insn; |
0a1c58a2 JL |
6880 | { |
6881 | if (sibcall_epilogue) | |
6882 | return contains (insn, sibcall_epilogue); | |
6883 | return 0; | |
6884 | } | |
6885 | ||
73ef99fb | 6886 | #ifdef HAVE_return |
69732dcb RH |
6887 | /* Insert gen_return at the end of block BB. This also means updating |
6888 | block_for_insn appropriately. */ | |
6889 | ||
6890 | static void | |
86c82654 | 6891 | emit_return_into_block (bb, line_note) |
69732dcb | 6892 | basic_block bb; |
86c82654 | 6893 | rtx line_note; |
69732dcb RH |
6894 | { |
6895 | rtx p, end; | |
6896 | ||
718fe406 | 6897 | p = NEXT_INSN (bb->end); |
86c82654 RH |
6898 | end = emit_jump_insn_after (gen_return (), bb->end); |
6899 | if (line_note) | |
6900 | emit_line_note_after (NOTE_SOURCE_FILE (line_note), | |
6901 | NOTE_LINE_NUMBER (line_note), bb->end); | |
6902 | ||
69732dcb RH |
6903 | while (1) |
6904 | { | |
6905 | set_block_for_insn (p, bb); | |
86c82654 | 6906 | if (p == bb->end) |
69732dcb | 6907 | break; |
86c82654 | 6908 | p = PREV_INSN (p); |
69732dcb RH |
6909 | } |
6910 | bb->end = end; | |
6911 | } | |
73ef99fb | 6912 | #endif /* HAVE_return */ |
69732dcb | 6913 | |
7393c642 RK |
6914 | #ifdef HAVE_epilogue |
6915 | ||
6916 | /* Modify SEQ, a SEQUENCE that is part of the epilogue, to no modifications | |
6917 | to the stack pointer. */ | |
6918 | ||
6919 | static void | |
6920 | keep_stack_depressed (seq) | |
6921 | rtx seq; | |
6922 | { | |
6923 | int i; | |
6924 | rtx sp_from_reg = 0; | |
6925 | int sp_modified_unknown = 0; | |
6926 | ||
6927 | /* If the epilogue is just a single instruction, it's OK as is */ | |
6928 | ||
6929 | if (GET_CODE (seq) != SEQUENCE) return; | |
6930 | ||
6931 | /* Scan all insns in SEQ looking for ones that modified the stack | |
6932 | pointer. Record if it modified the stack pointer by copying it | |
6933 | from the frame pointer or if it modified it in some other way. | |
6934 | Then modify any subsequent stack pointer references to take that | |
6935 | into account. We start by only allowing SP to be copied from a | |
6936 | register (presumably FP) and then be subsequently referenced. */ | |
6937 | ||
6938 | for (i = 0; i < XVECLEN (seq, 0); i++) | |
6939 | { | |
6940 | rtx insn = XVECEXP (seq, 0, i); | |
6941 | ||
6942 | if (GET_RTX_CLASS (GET_CODE (insn)) != 'i') | |
6943 | continue; | |
6944 | ||
6945 | if (reg_set_p (stack_pointer_rtx, insn)) | |
6946 | { | |
6947 | rtx set = single_set (insn); | |
6948 | ||
6949 | /* If SP is set as a side-effect, we can't support this. */ | |
6950 | if (set == 0) | |
6951 | abort (); | |
6952 | ||
6953 | if (GET_CODE (SET_SRC (set)) == REG) | |
6954 | sp_from_reg = SET_SRC (set); | |
6955 | else | |
6956 | sp_modified_unknown = 1; | |
6957 | ||
6958 | /* Don't allow the SP modification to happen. */ | |
6959 | PUT_CODE (insn, NOTE); | |
6960 | NOTE_LINE_NUMBER (insn) = NOTE_INSN_DELETED; | |
6961 | NOTE_SOURCE_FILE (insn) = 0; | |
6962 | } | |
6963 | else if (reg_referenced_p (stack_pointer_rtx, PATTERN (insn))) | |
6964 | { | |
6965 | if (sp_modified_unknown) | |
6966 | abort (); | |
6967 | ||
6968 | else if (sp_from_reg != 0) | |
6969 | PATTERN (insn) | |
6970 | = replace_rtx (PATTERN (insn), stack_pointer_rtx, sp_from_reg); | |
6971 | } | |
6972 | } | |
6973 | } | |
6974 | #endif | |
6975 | ||
9faa82d8 | 6976 | /* Generate the prologue and epilogue RTL if the machine supports it. Thread |
bdac5f58 TW |
6977 | this into place with notes indicating where the prologue ends and where |
6978 | the epilogue begins. Update the basic block information when possible. */ | |
6979 | ||
6980 | void | |
6981 | thread_prologue_and_epilogue_insns (f) | |
54ea1de9 | 6982 | rtx f ATTRIBUTE_UNUSED; |
bdac5f58 | 6983 | { |
ca1117cc | 6984 | int inserted = 0; |
19d3c25c RH |
6985 | edge e; |
6986 | rtx seq; | |
ca1117cc RH |
6987 | #ifdef HAVE_prologue |
6988 | rtx prologue_end = NULL_RTX; | |
6989 | #endif | |
86c82654 RH |
6990 | #if defined (HAVE_epilogue) || defined(HAVE_return) |
6991 | rtx epilogue_end = NULL_RTX; | |
6992 | #endif | |
e881bb1b | 6993 | |
bdac5f58 TW |
6994 | #ifdef HAVE_prologue |
6995 | if (HAVE_prologue) | |
6996 | { | |
e881bb1b | 6997 | start_sequence (); |
718fe406 | 6998 | seq = gen_prologue (); |
e881bb1b | 6999 | emit_insn (seq); |
bdac5f58 TW |
7000 | |
7001 | /* Retain a map of the prologue insns. */ | |
e881bb1b RH |
7002 | if (GET_CODE (seq) != SEQUENCE) |
7003 | seq = get_insns (); | |
0a1c58a2 | 7004 | record_insns (seq, &prologue); |
ca1117cc | 7005 | prologue_end = emit_note (NULL, NOTE_INSN_PROLOGUE_END); |
9185a8d5 | 7006 | |
e881bb1b RH |
7007 | seq = gen_sequence (); |
7008 | end_sequence (); | |
7009 | ||
7010 | /* If optimization is off, and perhaps in an empty function, | |
7011 | the entry block will have no successors. */ | |
7012 | if (ENTRY_BLOCK_PTR->succ) | |
7013 | { | |
7014 | /* Can't deal with multiple successsors of the entry block. */ | |
7015 | if (ENTRY_BLOCK_PTR->succ->succ_next) | |
7016 | abort (); | |
7017 | ||
7018 | insert_insn_on_edge (seq, ENTRY_BLOCK_PTR->succ); | |
ca1117cc | 7019 | inserted = 1; |
e881bb1b RH |
7020 | } |
7021 | else | |
7022 | emit_insn_after (seq, f); | |
bdac5f58 | 7023 | } |
bdac5f58 | 7024 | #endif |
bdac5f58 | 7025 | |
19d3c25c RH |
7026 | /* If the exit block has no non-fake predecessors, we don't need |
7027 | an epilogue. */ | |
718fe406 | 7028 | for (e = EXIT_BLOCK_PTR->pred; e; e = e->pred_next) |
19d3c25c RH |
7029 | if ((e->flags & EDGE_FAKE) == 0) |
7030 | break; | |
7031 | if (e == NULL) | |
7032 | goto epilogue_done; | |
7033 | ||
69732dcb RH |
7034 | #ifdef HAVE_return |
7035 | if (optimize && HAVE_return) | |
7036 | { | |
7037 | /* If we're allowed to generate a simple return instruction, | |
7038 | then by definition we don't need a full epilogue. Examine | |
718fe406 KH |
7039 | the block that falls through to EXIT. If it does not |
7040 | contain any code, examine its predecessors and try to | |
69732dcb RH |
7041 | emit (conditional) return instructions. */ |
7042 | ||
7043 | basic_block last; | |
7044 | edge e_next; | |
7045 | rtx label; | |
7046 | ||
718fe406 | 7047 | for (e = EXIT_BLOCK_PTR->pred; e; e = e->pred_next) |
69732dcb RH |
7048 | if (e->flags & EDGE_FALLTHRU) |
7049 | break; | |
7050 | if (e == NULL) | |
7051 | goto epilogue_done; | |
7052 | last = e->src; | |
7053 | ||
7054 | /* Verify that there are no active instructions in the last block. */ | |
7055 | label = last->end; | |
7056 | while (label && GET_CODE (label) != CODE_LABEL) | |
7057 | { | |
7058 | if (active_insn_p (label)) | |
7059 | break; | |
7060 | label = PREV_INSN (label); | |
7061 | } | |
7062 | ||
7063 | if (last->head == label && GET_CODE (label) == CODE_LABEL) | |
7064 | { | |
718fe406 | 7065 | rtx epilogue_line_note = NULL_RTX; |
86c82654 RH |
7066 | |
7067 | /* Locate the line number associated with the closing brace, | |
7068 | if we can find one. */ | |
7069 | for (seq = get_last_insn (); | |
7070 | seq && ! active_insn_p (seq); | |
7071 | seq = PREV_INSN (seq)) | |
7072 | if (GET_CODE (seq) == NOTE && NOTE_LINE_NUMBER (seq) > 0) | |
7073 | { | |
7074 | epilogue_line_note = seq; | |
7075 | break; | |
7076 | } | |
7077 | ||
718fe406 | 7078 | for (e = last->pred; e; e = e_next) |
69732dcb RH |
7079 | { |
7080 | basic_block bb = e->src; | |
7081 | rtx jump; | |
7082 | ||
7083 | e_next = e->pred_next; | |
7084 | if (bb == ENTRY_BLOCK_PTR) | |
7085 | continue; | |
7086 | ||
7087 | jump = bb->end; | |
a617c13f | 7088 | if ((GET_CODE (jump) != JUMP_INSN) || JUMP_LABEL (jump) != label) |
69732dcb RH |
7089 | continue; |
7090 | ||
7091 | /* If we have an unconditional jump, we can replace that | |
7092 | with a simple return instruction. */ | |
7093 | if (simplejump_p (jump)) | |
7094 | { | |
86c82654 | 7095 | emit_return_into_block (bb, epilogue_line_note); |
69732dcb RH |
7096 | flow_delete_insn (jump); |
7097 | } | |
7098 | ||
7099 | /* If we have a conditional jump, we can try to replace | |
7100 | that with a conditional return instruction. */ | |
7101 | else if (condjump_p (jump)) | |
7102 | { | |
7103 | rtx ret, *loc; | |
7104 | ||
7105 | ret = SET_SRC (PATTERN (jump)); | |
7106 | if (GET_CODE (XEXP (ret, 1)) == LABEL_REF) | |
7107 | loc = &XEXP (ret, 1); | |
7108 | else | |
7109 | loc = &XEXP (ret, 2); | |
7110 | ret = gen_rtx_RETURN (VOIDmode); | |
7111 | ||
7112 | if (! validate_change (jump, loc, ret, 0)) | |
7113 | continue; | |
7114 | if (JUMP_LABEL (jump)) | |
7115 | LABEL_NUSES (JUMP_LABEL (jump))--; | |
718fe406 | 7116 | |
3a75e42e CP |
7117 | /* If this block has only one successor, it both jumps |
7118 | and falls through to the fallthru block, so we can't | |
7119 | delete the edge. */ | |
718fe406 KH |
7120 | if (bb->succ->succ_next == NULL) |
7121 | continue; | |
69732dcb RH |
7122 | } |
7123 | else | |
7124 | continue; | |
7125 | ||
7126 | /* Fix up the CFG for the successful change we just made. */ | |
86c82654 | 7127 | redirect_edge_succ (e, EXIT_BLOCK_PTR); |
69732dcb | 7128 | } |
69732dcb | 7129 | |
2dd8bc01 GK |
7130 | /* Emit a return insn for the exit fallthru block. Whether |
7131 | this is still reachable will be determined later. */ | |
69732dcb | 7132 | |
2dd8bc01 | 7133 | emit_barrier_after (last->end); |
86c82654 RH |
7134 | emit_return_into_block (last, epilogue_line_note); |
7135 | epilogue_end = last->end; | |
718fe406 | 7136 | goto epilogue_done; |
2dd8bc01 | 7137 | } |
69732dcb RH |
7138 | } |
7139 | #endif | |
bdac5f58 TW |
7140 | #ifdef HAVE_epilogue |
7141 | if (HAVE_epilogue) | |
7142 | { | |
19d3c25c RH |
7143 | /* Find the edge that falls through to EXIT. Other edges may exist |
7144 | due to RETURN instructions, but those don't need epilogues. | |
7145 | There really shouldn't be a mixture -- either all should have | |
7146 | been converted or none, however... */ | |
e881bb1b | 7147 | |
718fe406 | 7148 | for (e = EXIT_BLOCK_PTR->pred; e; e = e->pred_next) |
19d3c25c RH |
7149 | if (e->flags & EDGE_FALLTHRU) |
7150 | break; | |
7151 | if (e == NULL) | |
7152 | goto epilogue_done; | |
a78bdb38 | 7153 | |
19d3c25c | 7154 | start_sequence (); |
86c82654 | 7155 | epilogue_end = emit_note (NULL, NOTE_INSN_EPILOGUE_BEG); |
a78bdb38 | 7156 | |
19d3c25c | 7157 | seq = gen_epilogue (); |
7393c642 RK |
7158 | |
7159 | /* If this function returns with the stack depressed, massage | |
7160 | the epilogue to actually do that. */ | |
43db0363 RK |
7161 | if (TREE_CODE (TREE_TYPE (current_function_decl)) == FUNCTION_TYPE |
7162 | && TYPE_RETURNS_STACK_DEPRESSED (TREE_TYPE (current_function_decl))) | |
7393c642 RK |
7163 | keep_stack_depressed (seq); |
7164 | ||
19d3c25c | 7165 | emit_jump_insn (seq); |
bdac5f58 | 7166 | |
19d3c25c RH |
7167 | /* Retain a map of the epilogue insns. */ |
7168 | if (GET_CODE (seq) != SEQUENCE) | |
7169 | seq = get_insns (); | |
0a1c58a2 | 7170 | record_insns (seq, &epilogue); |
bdac5f58 | 7171 | |
19d3c25c | 7172 | seq = gen_sequence (); |
718fe406 | 7173 | end_sequence (); |
e881bb1b | 7174 | |
19d3c25c | 7175 | insert_insn_on_edge (seq, e); |
ca1117cc | 7176 | inserted = 1; |
bdac5f58 TW |
7177 | } |
7178 | #endif | |
19d3c25c | 7179 | epilogue_done: |
e881bb1b | 7180 | |
ca1117cc | 7181 | if (inserted) |
e881bb1b | 7182 | commit_edge_insertions (); |
0a1c58a2 JL |
7183 | |
7184 | #ifdef HAVE_sibcall_epilogue | |
7185 | /* Emit sibling epilogues before any sibling call sites. */ | |
718fe406 | 7186 | for (e = EXIT_BLOCK_PTR->pred; e; e = e->pred_next) |
0a1c58a2 JL |
7187 | { |
7188 | basic_block bb = e->src; | |
7189 | rtx insn = bb->end; | |
7190 | rtx i; | |
1b513b77 | 7191 | rtx newinsn; |
0a1c58a2 JL |
7192 | |
7193 | if (GET_CODE (insn) != CALL_INSN | |
7194 | || ! SIBLING_CALL_P (insn)) | |
7195 | continue; | |
7196 | ||
7197 | start_sequence (); | |
7198 | seq = gen_sibcall_epilogue (); | |
7199 | end_sequence (); | |
7200 | ||
7201 | i = PREV_INSN (insn); | |
1b513b77 | 7202 | newinsn = emit_insn_before (seq, insn); |
0a1c58a2 JL |
7203 | |
7204 | /* Update the UID to basic block map. */ | |
7205 | for (i = NEXT_INSN (i); i != insn; i = NEXT_INSN (i)) | |
7206 | set_block_for_insn (i, bb); | |
7207 | ||
7208 | /* Retain a map of the epilogue insns. Used in life analysis to | |
7209 | avoid getting rid of sibcall epilogue insns. */ | |
1b513b77 JH |
7210 | record_insns (GET_CODE (seq) == SEQUENCE |
7211 | ? seq : newinsn, &sibcall_epilogue); | |
0a1c58a2 JL |
7212 | } |
7213 | #endif | |
ca1117cc RH |
7214 | |
7215 | #ifdef HAVE_prologue | |
7216 | if (prologue_end) | |
7217 | { | |
7218 | rtx insn, prev; | |
7219 | ||
7220 | /* GDB handles `break f' by setting a breakpoint on the first | |
30196c1f | 7221 | line note after the prologue. Which means (1) that if |
ca1117cc | 7222 | there are line number notes before where we inserted the |
30196c1f RH |
7223 | prologue we should move them, and (2) we should generate a |
7224 | note before the end of the first basic block, if there isn't | |
7225 | one already there. */ | |
ca1117cc | 7226 | |
718fe406 | 7227 | for (insn = prologue_end; insn; insn = prev) |
ca1117cc RH |
7228 | { |
7229 | prev = PREV_INSN (insn); | |
7230 | if (GET_CODE (insn) == NOTE && NOTE_LINE_NUMBER (insn) > 0) | |
7231 | { | |
7232 | /* Note that we cannot reorder the first insn in the | |
7233 | chain, since rest_of_compilation relies on that | |
30196c1f | 7234 | remaining constant. */ |
ca1117cc | 7235 | if (prev == NULL) |
30196c1f RH |
7236 | break; |
7237 | reorder_insns (insn, insn, prologue_end); | |
ca1117cc RH |
7238 | } |
7239 | } | |
7240 | ||
30196c1f RH |
7241 | /* Find the last line number note in the first block. */ |
7242 | for (insn = BASIC_BLOCK (0)->end; | |
7243 | insn != prologue_end; | |
7244 | insn = PREV_INSN (insn)) | |
7245 | if (GET_CODE (insn) == NOTE && NOTE_LINE_NUMBER (insn) > 0) | |
7246 | break; | |
7247 | ||
7248 | /* If we didn't find one, make a copy of the first line number | |
7249 | we run across. */ | |
7250 | if (! insn) | |
ca1117cc | 7251 | { |
30196c1f RH |
7252 | for (insn = next_active_insn (prologue_end); |
7253 | insn; | |
7254 | insn = PREV_INSN (insn)) | |
7255 | if (GET_CODE (insn) == NOTE && NOTE_LINE_NUMBER (insn) > 0) | |
7256 | { | |
7257 | emit_line_note_after (NOTE_SOURCE_FILE (insn), | |
7258 | NOTE_LINE_NUMBER (insn), | |
7259 | prologue_end); | |
7260 | break; | |
7261 | } | |
ca1117cc RH |
7262 | } |
7263 | } | |
7264 | #endif | |
86c82654 RH |
7265 | #ifdef HAVE_epilogue |
7266 | if (epilogue_end) | |
7267 | { | |
7268 | rtx insn, next; | |
7269 | ||
7270 | /* Similarly, move any line notes that appear after the epilogue. | |
7271 | There is no need, however, to be quite so anal about the existance | |
7272 | of such a note. */ | |
718fe406 | 7273 | for (insn = epilogue_end; insn; insn = next) |
86c82654 RH |
7274 | { |
7275 | next = NEXT_INSN (insn); | |
7276 | if (GET_CODE (insn) == NOTE && NOTE_LINE_NUMBER (insn) > 0) | |
7277 | reorder_insns (insn, insn, PREV_INSN (epilogue_end)); | |
7278 | } | |
7279 | } | |
7280 | #endif | |
bdac5f58 TW |
7281 | } |
7282 | ||
7283 | /* Reposition the prologue-end and epilogue-begin notes after instruction | |
7284 | scheduling and delayed branch scheduling. */ | |
7285 | ||
7286 | void | |
7287 | reposition_prologue_and_epilogue_notes (f) | |
79c9824e | 7288 | rtx f ATTRIBUTE_UNUSED; |
bdac5f58 TW |
7289 | { |
7290 | #if defined (HAVE_prologue) || defined (HAVE_epilogue) | |
0a1c58a2 JL |
7291 | int len; |
7292 | ||
7293 | if ((len = VARRAY_SIZE (prologue)) > 0) | |
bdac5f58 | 7294 | { |
0a1c58a2 | 7295 | register rtx insn, note = 0; |
bdac5f58 | 7296 | |
0a1c58a2 JL |
7297 | /* Scan from the beginning until we reach the last prologue insn. |
7298 | We apparently can't depend on basic_block_{head,end} after | |
7299 | reorg has run. */ | |
7300 | for (insn = f; len && insn; insn = NEXT_INSN (insn)) | |
bdac5f58 | 7301 | { |
0a1c58a2 | 7302 | if (GET_CODE (insn) == NOTE) |
9392c110 | 7303 | { |
0a1c58a2 JL |
7304 | if (NOTE_LINE_NUMBER (insn) == NOTE_INSN_PROLOGUE_END) |
7305 | note = insn; | |
7306 | } | |
7307 | else if ((len -= contains (insn, prologue)) == 0) | |
7308 | { | |
7309 | rtx next; | |
7310 | /* Find the prologue-end note if we haven't already, and | |
7311 | move it to just after the last prologue insn. */ | |
7312 | if (note == 0) | |
9392c110 | 7313 | { |
0a1c58a2 JL |
7314 | for (note = insn; (note = NEXT_INSN (note));) |
7315 | if (GET_CODE (note) == NOTE | |
7316 | && NOTE_LINE_NUMBER (note) == NOTE_INSN_PROLOGUE_END) | |
7317 | break; | |
9392c110 | 7318 | } |
c93b03c2 | 7319 | |
0a1c58a2 | 7320 | next = NEXT_INSN (note); |
c93b03c2 | 7321 | |
718fe406 | 7322 | /* Whether or not we can depend on BLOCK_HEAD, |
0a1c58a2 JL |
7323 | attempt to keep it up-to-date. */ |
7324 | if (BLOCK_HEAD (0) == note) | |
7325 | BLOCK_HEAD (0) = next; | |
c93b03c2 | 7326 | |
0a1c58a2 JL |
7327 | remove_insn (note); |
7328 | add_insn_after (note, insn); | |
9392c110 | 7329 | } |
bdac5f58 | 7330 | } |
0a1c58a2 JL |
7331 | } |
7332 | ||
7333 | if ((len = VARRAY_SIZE (epilogue)) > 0) | |
7334 | { | |
7335 | register rtx insn, note = 0; | |
bdac5f58 | 7336 | |
0a1c58a2 JL |
7337 | /* Scan from the end until we reach the first epilogue insn. |
7338 | We apparently can't depend on basic_block_{head,end} after | |
7339 | reorg has run. */ | |
7340 | for (insn = get_last_insn (); len && insn; insn = PREV_INSN (insn)) | |
bdac5f58 | 7341 | { |
0a1c58a2 | 7342 | if (GET_CODE (insn) == NOTE) |
9392c110 | 7343 | { |
0a1c58a2 JL |
7344 | if (NOTE_LINE_NUMBER (insn) == NOTE_INSN_EPILOGUE_BEG) |
7345 | note = insn; | |
7346 | } | |
7347 | else if ((len -= contains (insn, epilogue)) == 0) | |
7348 | { | |
7349 | /* Find the epilogue-begin note if we haven't already, and | |
7350 | move it to just before the first epilogue insn. */ | |
7351 | if (note == 0) | |
9392c110 | 7352 | { |
0a1c58a2 JL |
7353 | for (note = insn; (note = PREV_INSN (note));) |
7354 | if (GET_CODE (note) == NOTE | |
7355 | && NOTE_LINE_NUMBER (note) == NOTE_INSN_EPILOGUE_BEG) | |
7356 | break; | |
9392c110 | 7357 | } |
c93b03c2 | 7358 | |
718fe406 | 7359 | /* Whether or not we can depend on BLOCK_HEAD, |
0a1c58a2 JL |
7360 | attempt to keep it up-to-date. */ |
7361 | if (n_basic_blocks | |
7362 | && BLOCK_HEAD (n_basic_blocks-1) == insn) | |
7363 | BLOCK_HEAD (n_basic_blocks-1) = note; | |
c93b03c2 | 7364 | |
0a1c58a2 JL |
7365 | remove_insn (note); |
7366 | add_insn_before (note, insn); | |
9392c110 | 7367 | } |
bdac5f58 TW |
7368 | } |
7369 | } | |
7370 | #endif /* HAVE_prologue or HAVE_epilogue */ | |
7371 | } | |
87ff9c8e RH |
7372 | |
7373 | /* Mark T for GC. */ | |
7374 | ||
7375 | static void | |
7376 | mark_temp_slot (t) | |
718fe406 | 7377 | struct temp_slot *t; |
87ff9c8e RH |
7378 | { |
7379 | while (t) | |
7380 | { | |
7381 | ggc_mark_rtx (t->slot); | |
7382 | ggc_mark_rtx (t->address); | |
591ccf92 MM |
7383 | ggc_mark_tree (t->rtl_expr); |
7384 | ||
87ff9c8e RH |
7385 | t = t->next; |
7386 | } | |
7387 | } | |
7388 | ||
7389 | /* Mark P for GC. */ | |
7390 | ||
7391 | static void | |
fa51b01b | 7392 | mark_function_status (p) |
87ff9c8e RH |
7393 | struct function *p; |
7394 | { | |
7395 | int i; | |
7396 | rtx *r; | |
7397 | ||
7398 | if (p == 0) | |
7399 | return; | |
7400 | ||
7401 | ggc_mark_rtx (p->arg_offset_rtx); | |
7402 | ||
21cd906e MM |
7403 | if (p->x_parm_reg_stack_loc) |
7404 | for (i = p->x_max_parm_reg, r = p->x_parm_reg_stack_loc; | |
7405 | i > 0; --i, ++r) | |
7406 | ggc_mark_rtx (*r); | |
87ff9c8e RH |
7407 | |
7408 | ggc_mark_rtx (p->return_rtx); | |
7409 | ggc_mark_rtx (p->x_cleanup_label); | |
7410 | ggc_mark_rtx (p->x_return_label); | |
7411 | ggc_mark_rtx (p->x_save_expr_regs); | |
7412 | ggc_mark_rtx (p->x_stack_slot_list); | |
7413 | ggc_mark_rtx (p->x_parm_birth_insn); | |
7414 | ggc_mark_rtx (p->x_tail_recursion_label); | |
7415 | ggc_mark_rtx (p->x_tail_recursion_reentry); | |
7416 | ggc_mark_rtx (p->internal_arg_pointer); | |
7417 | ggc_mark_rtx (p->x_arg_pointer_save_area); | |
7418 | ggc_mark_tree (p->x_rtl_expr_chain); | |
7419 | ggc_mark_rtx (p->x_last_parm_insn); | |
7420 | ggc_mark_tree (p->x_context_display); | |
7421 | ggc_mark_tree (p->x_trampoline_list); | |
7422 | ggc_mark_rtx (p->epilogue_delay_list); | |
b313a0fe | 7423 | ggc_mark_rtx (p->x_clobber_return_insn); |
87ff9c8e RH |
7424 | |
7425 | mark_temp_slot (p->x_temp_slots); | |
7426 | ||
7427 | { | |
7428 | struct var_refs_queue *q = p->fixup_var_refs_queue; | |
7429 | while (q) | |
7430 | { | |
7431 | ggc_mark_rtx (q->modified); | |
7432 | q = q->next; | |
7433 | } | |
7434 | } | |
7435 | ||
7436 | ggc_mark_rtx (p->x_nonlocal_goto_handler_slots); | |
afe3d090 | 7437 | ggc_mark_rtx (p->x_nonlocal_goto_handler_labels); |
87ff9c8e RH |
7438 | ggc_mark_rtx (p->x_nonlocal_goto_stack_level); |
7439 | ggc_mark_tree (p->x_nonlocal_labels); | |
7440 | } | |
7441 | ||
7442 | /* Mark the function chain ARG (which is really a struct function **) | |
7443 | for GC. */ | |
7444 | ||
7445 | static void | |
7446 | mark_function_chain (arg) | |
7447 | void *arg; | |
7448 | { | |
7449 | struct function *f = *(struct function **) arg; | |
7450 | ||
7451 | for (; f; f = f->next_global) | |
7452 | { | |
87ff9c8e RH |
7453 | ggc_mark_tree (f->decl); |
7454 | ||
fa51b01b RH |
7455 | mark_function_status (f); |
7456 | mark_eh_status (f->eh); | |
7457 | mark_stmt_status (f->stmt); | |
7458 | mark_expr_status (f->expr); | |
7459 | mark_emit_status (f->emit); | |
7460 | mark_varasm_status (f->varasm); | |
87ff9c8e RH |
7461 | |
7462 | if (mark_machine_status) | |
7463 | (*mark_machine_status) (f); | |
7464 | if (mark_lang_status) | |
7465 | (*mark_lang_status) (f); | |
7466 | ||
7467 | if (f->original_arg_vector) | |
7468 | ggc_mark_rtvec ((rtvec) f->original_arg_vector); | |
7469 | if (f->original_decl_initial) | |
7470 | ggc_mark_tree (f->original_decl_initial); | |
7471 | } | |
7472 | } | |
7473 | ||
7474 | /* Called once, at initialization, to initialize function.c. */ | |
7475 | ||
7476 | void | |
7477 | init_function_once () | |
7478 | { | |
7479 | ggc_add_root (&all_functions, 1, sizeof all_functions, | |
7480 | mark_function_chain); | |
0a1c58a2 JL |
7481 | |
7482 | VARRAY_INT_INIT (prologue, 0, "prologue"); | |
7483 | VARRAY_INT_INIT (epilogue, 0, "epilogue"); | |
7484 | VARRAY_INT_INIT (sibcall_epilogue, 0, "sibcall_epilogue"); | |
87ff9c8e | 7485 | } |