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51bbfa0c | 1 | /* Convert function calls to rtl insns, for GNU C compiler. |
23a5b65a | 2 | Copyright (C) 1989-2014 Free Software Foundation, Inc. |
51bbfa0c | 3 | |
1322177d | 4 | This file is part of GCC. |
51bbfa0c | 5 | |
1322177d LB |
6 | GCC is free software; you can redistribute it and/or modify it under |
7 | the terms of the GNU General Public License as published by the Free | |
9dcd6f09 | 8 | Software Foundation; either version 3, or (at your option) any later |
1322177d | 9 | version. |
51bbfa0c | 10 | |
1322177d LB |
11 | GCC is distributed in the hope that it will be useful, but WITHOUT ANY |
12 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
13 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
14 | for more details. | |
51bbfa0c RS |
15 | |
16 | You should have received a copy of the GNU General Public License | |
9dcd6f09 NC |
17 | along with GCC; see the file COPYING3. If not see |
18 | <http://www.gnu.org/licenses/>. */ | |
51bbfa0c RS |
19 | |
20 | #include "config.h" | |
670ee920 | 21 | #include "system.h" |
4977bab6 ZW |
22 | #include "coretypes.h" |
23 | #include "tm.h" | |
670ee920 KG |
24 | #include "rtl.h" |
25 | #include "tree.h" | |
d8a2d370 DN |
26 | #include "stor-layout.h" |
27 | #include "varasm.h" | |
28 | #include "stringpool.h" | |
29 | #include "attribs.h" | |
2fb9a547 AM |
30 | #include "basic-block.h" |
31 | #include "tree-ssa-alias.h" | |
32 | #include "internal-fn.h" | |
33 | #include "gimple-expr.h" | |
34 | #include "is-a.h" | |
726a989a | 35 | #include "gimple.h" |
670ee920 KG |
36 | #include "flags.h" |
37 | #include "expr.h" | |
6e985040 | 38 | #include "optabs.h" |
e78d8e51 | 39 | #include "libfuncs.h" |
49ad7cfa | 40 | #include "function.h" |
670ee920 | 41 | #include "regs.h" |
718f9c0f | 42 | #include "diagnostic-core.h" |
d6f4ec51 | 43 | #include "output.h" |
b1474bb7 | 44 | #include "tm_p.h" |
ea11ca7e | 45 | #include "timevar.h" |
c67846f2 | 46 | #include "sbitmap.h" |
b0c48229 | 47 | #include "langhooks.h" |
23626154 | 48 | #include "target.h" |
b255a036 | 49 | #include "cgraph.h" |
b2dd096b | 50 | #include "except.h" |
6fb5fa3c | 51 | #include "dbgcnt.h" |
e9f56944 | 52 | #include "rtl-iter.h" |
51bbfa0c | 53 | |
c795bca9 BS |
54 | /* Like PREFERRED_STACK_BOUNDARY but in units of bytes, not bits. */ |
55 | #define STACK_BYTES (PREFERRED_STACK_BOUNDARY / BITS_PER_UNIT) | |
51bbfa0c RS |
56 | |
57 | /* Data structure and subroutines used within expand_call. */ | |
58 | ||
59 | struct arg_data | |
60 | { | |
61 | /* Tree node for this argument. */ | |
62 | tree tree_value; | |
1efe6448 RK |
63 | /* Mode for value; TYPE_MODE unless promoted. */ |
64 | enum machine_mode mode; | |
51bbfa0c RS |
65 | /* Current RTL value for argument, or 0 if it isn't precomputed. */ |
66 | rtx value; | |
67 | /* Initially-compute RTL value for argument; only for const functions. */ | |
68 | rtx initial_value; | |
69 | /* Register to pass this argument in, 0 if passed on stack, or an | |
cacbd532 | 70 | PARALLEL if the arg is to be copied into multiple non-contiguous |
51bbfa0c RS |
71 | registers. */ |
72 | rtx reg; | |
099e9712 JH |
73 | /* Register to pass this argument in when generating tail call sequence. |
74 | This is not the same register as for normal calls on machines with | |
75 | register windows. */ | |
76 | rtx tail_call_reg; | |
8df3dbb7 RH |
77 | /* If REG is a PARALLEL, this is a copy of VALUE pulled into the correct |
78 | form for emit_group_move. */ | |
79 | rtx parallel_value; | |
84b55618 RK |
80 | /* If REG was promoted from the actual mode of the argument expression, |
81 | indicates whether the promotion is sign- or zero-extended. */ | |
82 | int unsignedp; | |
f0078f86 AM |
83 | /* Number of bytes to put in registers. 0 means put the whole arg |
84 | in registers. Also 0 if not passed in registers. */ | |
51bbfa0c | 85 | int partial; |
da7d8304 | 86 | /* Nonzero if argument must be passed on stack. |
d64f5a78 RS |
87 | Note that some arguments may be passed on the stack |
88 | even though pass_on_stack is zero, just because FUNCTION_ARG says so. | |
89 | pass_on_stack identifies arguments that *cannot* go in registers. */ | |
51bbfa0c | 90 | int pass_on_stack; |
e7949876 AM |
91 | /* Some fields packaged up for locate_and_pad_parm. */ |
92 | struct locate_and_pad_arg_data locate; | |
51bbfa0c RS |
93 | /* Location on the stack at which parameter should be stored. The store |
94 | has already been done if STACK == VALUE. */ | |
95 | rtx stack; | |
96 | /* Location on the stack of the start of this argument slot. This can | |
97 | differ from STACK if this arg pads downward. This location is known | |
c2ed6cf8 | 98 | to be aligned to TARGET_FUNCTION_ARG_BOUNDARY. */ |
51bbfa0c | 99 | rtx stack_slot; |
51bbfa0c RS |
100 | /* Place that this stack area has been saved, if needed. */ |
101 | rtx save_area; | |
4ab56118 RK |
102 | /* If an argument's alignment does not permit direct copying into registers, |
103 | copy in smaller-sized pieces into pseudos. These are stored in a | |
104 | block pointed to by this field. The next field says how many | |
105 | word-sized pseudos we made. */ | |
106 | rtx *aligned_regs; | |
107 | int n_aligned_regs; | |
51bbfa0c RS |
108 | }; |
109 | ||
da7d8304 | 110 | /* A vector of one char per byte of stack space. A byte if nonzero if |
51bbfa0c RS |
111 | the corresponding stack location has been used. |
112 | This vector is used to prevent a function call within an argument from | |
113 | clobbering any stack already set up. */ | |
114 | static char *stack_usage_map; | |
115 | ||
116 | /* Size of STACK_USAGE_MAP. */ | |
117 | static int highest_outgoing_arg_in_use; | |
2f4aa534 | 118 | |
c67846f2 JJ |
119 | /* A bitmap of virtual-incoming stack space. Bit is set if the corresponding |
120 | stack location's tail call argument has been already stored into the stack. | |
121 | This bitmap is used to prevent sibling call optimization if function tries | |
122 | to use parent's incoming argument slots when they have been already | |
123 | overwritten with tail call arguments. */ | |
124 | static sbitmap stored_args_map; | |
125 | ||
2f4aa534 RS |
126 | /* stack_arg_under_construction is nonzero when an argument may be |
127 | initialized with a constructor call (including a C function that | |
128 | returns a BLKmode struct) and expand_call must take special action | |
129 | to make sure the object being constructed does not overlap the | |
130 | argument list for the constructor call. */ | |
0405cc0e | 131 | static int stack_arg_under_construction; |
51bbfa0c | 132 | |
6de9cd9a | 133 | static void emit_call_1 (rtx, tree, tree, tree, HOST_WIDE_INT, HOST_WIDE_INT, |
d329e058 | 134 | HOST_WIDE_INT, rtx, rtx, int, rtx, int, |
d5cc9181 | 135 | cumulative_args_t); |
d329e058 AJ |
136 | static void precompute_register_parameters (int, struct arg_data *, int *); |
137 | static int store_one_arg (struct arg_data *, rtx, int, int, int); | |
138 | static void store_unaligned_arguments_into_pseudos (struct arg_data *, int); | |
139 | static int finalize_must_preallocate (int, int, struct arg_data *, | |
140 | struct args_size *); | |
84b8030f | 141 | static void precompute_arguments (int, struct arg_data *); |
5d059ed9 | 142 | static int compute_argument_block_size (int, struct args_size *, tree, tree, int); |
d329e058 | 143 | static void initialize_argument_information (int, struct arg_data *, |
078a18a4 SL |
144 | struct args_size *, int, |
145 | tree, tree, | |
d5cc9181 | 146 | tree, tree, cumulative_args_t, int, |
dd292d0a | 147 | rtx *, int *, int *, int *, |
6de9cd9a | 148 | bool *, bool); |
d329e058 AJ |
149 | static void compute_argument_addresses (struct arg_data *, rtx, int); |
150 | static rtx rtx_for_function_call (tree, tree); | |
151 | static void load_register_parameters (struct arg_data *, int, rtx *, int, | |
152 | int, int *); | |
153 | static rtx emit_library_call_value_1 (int, rtx, rtx, enum libcall_type, | |
154 | enum machine_mode, int, va_list); | |
6ea2b70d | 155 | static int special_function_p (const_tree, int); |
d329e058 | 156 | static int check_sibcall_argument_overlap_1 (rtx); |
48810515 | 157 | static int check_sibcall_argument_overlap (rtx_insn *, struct arg_data *, int); |
d329e058 AJ |
158 | |
159 | static int combine_pending_stack_adjustment_and_call (int, struct args_size *, | |
95899b34 | 160 | unsigned int); |
2f2b4a02 | 161 | static tree split_complex_types (tree); |
21a3b983 | 162 | |
f73ad30e | 163 | #ifdef REG_PARM_STACK_SPACE |
d329e058 AJ |
164 | static rtx save_fixed_argument_area (int, rtx, int *, int *); |
165 | static void restore_fixed_argument_area (rtx, rtx, int, int); | |
20efdf74 | 166 | #endif |
51bbfa0c | 167 | \f |
51bbfa0c RS |
168 | /* Force FUNEXP into a form suitable for the address of a CALL, |
169 | and return that as an rtx. Also load the static chain register | |
170 | if FNDECL is a nested function. | |
171 | ||
77cac2f2 RK |
172 | CALL_FUSAGE points to a variable holding the prospective |
173 | CALL_INSN_FUNCTION_USAGE information. */ | |
51bbfa0c | 174 | |
03dacb02 | 175 | rtx |
531ca746 | 176 | prepare_call_address (tree fndecl, rtx funexp, rtx static_chain_value, |
6de9cd9a | 177 | rtx *call_fusage, int reg_parm_seen, int sibcallp) |
51bbfa0c | 178 | { |
ba228239 | 179 | /* Make a valid memory address and copy constants through pseudo-regs, |
51bbfa0c RS |
180 | but not for a constant address if -fno-function-cse. */ |
181 | if (GET_CODE (funexp) != SYMBOL_REF) | |
01368078 | 182 | /* If we are using registers for parameters, force the |
e9a25f70 | 183 | function address into a register now. */ |
42db504c SB |
184 | funexp = ((reg_parm_seen |
185 | && targetm.small_register_classes_for_mode_p (FUNCTION_MODE)) | |
e9a25f70 JL |
186 | ? force_not_mem (memory_address (FUNCTION_MODE, funexp)) |
187 | : memory_address (FUNCTION_MODE, funexp)); | |
3affaf29 | 188 | else if (! sibcallp) |
51bbfa0c RS |
189 | { |
190 | #ifndef NO_FUNCTION_CSE | |
191 | if (optimize && ! flag_no_function_cse) | |
082a099c | 192 | funexp = force_reg (Pmode, funexp); |
51bbfa0c RS |
193 | #endif |
194 | } | |
195 | ||
196 | if (static_chain_value != 0) | |
197 | { | |
531ca746 RH |
198 | rtx chain; |
199 | ||
200 | gcc_assert (fndecl); | |
201 | chain = targetm.calls.static_chain (fndecl, false); | |
5e89a381 | 202 | static_chain_value = convert_memory_address (Pmode, static_chain_value); |
51bbfa0c | 203 | |
531ca746 RH |
204 | emit_move_insn (chain, static_chain_value); |
205 | if (REG_P (chain)) | |
206 | use_reg (call_fusage, chain); | |
51bbfa0c RS |
207 | } |
208 | ||
209 | return funexp; | |
210 | } | |
211 | ||
212 | /* Generate instructions to call function FUNEXP, | |
213 | and optionally pop the results. | |
214 | The CALL_INSN is the first insn generated. | |
215 | ||
607ea900 | 216 | FNDECL is the declaration node of the function. This is given to the |
079e7538 NF |
217 | hook TARGET_RETURN_POPS_ARGS to determine whether this function pops |
218 | its own args. | |
2c8da025 | 219 | |
079e7538 NF |
220 | FUNTYPE is the data type of the function. This is given to the hook |
221 | TARGET_RETURN_POPS_ARGS to determine whether this function pops its | |
222 | own args. We used to allow an identifier for library functions, but | |
223 | that doesn't work when the return type is an aggregate type and the | |
224 | calling convention says that the pointer to this aggregate is to be | |
225 | popped by the callee. | |
51bbfa0c RS |
226 | |
227 | STACK_SIZE is the number of bytes of arguments on the stack, | |
c2732da3 JM |
228 | ROUNDED_STACK_SIZE is that number rounded up to |
229 | PREFERRED_STACK_BOUNDARY; zero if the size is variable. This is | |
230 | both to put into the call insn and to generate explicit popping | |
231 | code if necessary. | |
51bbfa0c RS |
232 | |
233 | STRUCT_VALUE_SIZE is the number of bytes wanted in a structure value. | |
234 | It is zero if this call doesn't want a structure value. | |
235 | ||
236 | NEXT_ARG_REG is the rtx that results from executing | |
3c07301f | 237 | targetm.calls.function_arg (&args_so_far, VOIDmode, void_type_node, true) |
51bbfa0c RS |
238 | just after all the args have had their registers assigned. |
239 | This could be whatever you like, but normally it is the first | |
240 | arg-register beyond those used for args in this call, | |
241 | or 0 if all the arg-registers are used in this call. | |
242 | It is passed on to `gen_call' so you can put this info in the call insn. | |
243 | ||
244 | VALREG is a hard register in which a value is returned, | |
245 | or 0 if the call does not return a value. | |
246 | ||
247 | OLD_INHIBIT_DEFER_POP is the value that `inhibit_defer_pop' had before | |
248 | the args to this call were processed. | |
249 | We restore `inhibit_defer_pop' to that value. | |
250 | ||
94b25f81 | 251 | CALL_FUSAGE is either empty or an EXPR_LIST of USE expressions that |
6d2f8887 | 252 | denote registers used by the called function. */ |
f725a3ec | 253 | |
322e3e34 | 254 | static void |
28ed065e | 255 | emit_call_1 (rtx funexp, tree fntree ATTRIBUTE_UNUSED, tree fndecl ATTRIBUTE_UNUSED, |
6de9cd9a | 256 | tree funtype ATTRIBUTE_UNUSED, |
d329e058 AJ |
257 | HOST_WIDE_INT stack_size ATTRIBUTE_UNUSED, |
258 | HOST_WIDE_INT rounded_stack_size, | |
259 | HOST_WIDE_INT struct_value_size ATTRIBUTE_UNUSED, | |
260 | rtx next_arg_reg ATTRIBUTE_UNUSED, rtx valreg, | |
261 | int old_inhibit_defer_pop, rtx call_fusage, int ecf_flags, | |
d5cc9181 | 262 | cumulative_args_t args_so_far ATTRIBUTE_UNUSED) |
51bbfa0c | 263 | { |
062e7fd8 | 264 | rtx rounded_stack_size_rtx = GEN_INT (rounded_stack_size); |
48810515 DM |
265 | rtx_insn *call_insn; |
266 | rtx call, funmem; | |
51bbfa0c | 267 | int already_popped = 0; |
079e7538 NF |
268 | HOST_WIDE_INT n_popped |
269 | = targetm.calls.return_pops_args (fndecl, funtype, stack_size); | |
51bbfa0c | 270 | |
fa5322fa | 271 | #ifdef CALL_POPS_ARGS |
d5cc9181 | 272 | n_popped += CALL_POPS_ARGS (*get_cumulative_args (args_so_far)); |
fa5322fa | 273 | #endif |
d329e058 | 274 | |
51bbfa0c RS |
275 | /* Ensure address is valid. SYMBOL_REF is already valid, so no need, |
276 | and we don't want to load it into a register as an optimization, | |
277 | because prepare_call_address already did it if it should be done. */ | |
278 | if (GET_CODE (funexp) != SYMBOL_REF) | |
279 | funexp = memory_address (FUNCTION_MODE, funexp); | |
280 | ||
325f5379 JJ |
281 | funmem = gen_rtx_MEM (FUNCTION_MODE, funexp); |
282 | if (fndecl && TREE_CODE (fndecl) == FUNCTION_DECL) | |
047d33a0 AO |
283 | { |
284 | tree t = fndecl; | |
e79983f4 | 285 | |
047d33a0 AO |
286 | /* Although a built-in FUNCTION_DECL and its non-__builtin |
287 | counterpart compare equal and get a shared mem_attrs, they | |
288 | produce different dump output in compare-debug compilations, | |
289 | if an entry gets garbage collected in one compilation, then | |
290 | adds a different (but equivalent) entry, while the other | |
291 | doesn't run the garbage collector at the same spot and then | |
292 | shares the mem_attr with the equivalent entry. */ | |
e79983f4 MM |
293 | if (DECL_BUILT_IN_CLASS (t) == BUILT_IN_NORMAL) |
294 | { | |
295 | tree t2 = builtin_decl_explicit (DECL_FUNCTION_CODE (t)); | |
296 | if (t2) | |
297 | t = t2; | |
298 | } | |
299 | ||
300 | set_mem_expr (funmem, t); | |
047d33a0 | 301 | } |
325f5379 | 302 | else if (fntree) |
e19f6650 | 303 | set_mem_expr (funmem, build_simple_mem_ref (CALL_EXPR_FN (fntree))); |
325f5379 | 304 | |
0a1c58a2 JL |
305 | #if defined (HAVE_sibcall_pop) && defined (HAVE_sibcall_value_pop) |
306 | if ((ecf_flags & ECF_SIBCALL) | |
307 | && HAVE_sibcall_pop && HAVE_sibcall_value_pop | |
f132f529 | 308 | && (n_popped > 0 || stack_size == 0)) |
0a1c58a2 | 309 | { |
8ac61af7 | 310 | rtx n_pop = GEN_INT (n_popped); |
0a1c58a2 JL |
311 | rtx pat; |
312 | ||
313 | /* If this subroutine pops its own args, record that in the call insn | |
314 | if possible, for the sake of frame pointer elimination. */ | |
315 | ||
316 | if (valreg) | |
325f5379 JJ |
317 | pat = GEN_SIBCALL_VALUE_POP (valreg, funmem, rounded_stack_size_rtx, |
318 | next_arg_reg, n_pop); | |
0a1c58a2 | 319 | else |
325f5379 JJ |
320 | pat = GEN_SIBCALL_POP (funmem, rounded_stack_size_rtx, next_arg_reg, |
321 | n_pop); | |
0a1c58a2 JL |
322 | |
323 | emit_call_insn (pat); | |
324 | already_popped = 1; | |
325 | } | |
326 | else | |
327 | #endif | |
328 | ||
51bbfa0c | 329 | #if defined (HAVE_call_pop) && defined (HAVE_call_value_pop) |
8ac61af7 RK |
330 | /* If the target has "call" or "call_value" insns, then prefer them |
331 | if no arguments are actually popped. If the target does not have | |
332 | "call" or "call_value" insns, then we must use the popping versions | |
333 | even if the call has no arguments to pop. */ | |
8bcafee3 JDA |
334 | #if defined (HAVE_call) && defined (HAVE_call_value) |
335 | if (HAVE_call && HAVE_call_value && HAVE_call_pop && HAVE_call_value_pop | |
9dd9bf80 | 336 | && n_popped > 0) |
8bcafee3 JDA |
337 | #else |
338 | if (HAVE_call_pop && HAVE_call_value_pop) | |
339 | #endif | |
51bbfa0c | 340 | { |
fb5eebb9 | 341 | rtx n_pop = GEN_INT (n_popped); |
51bbfa0c RS |
342 | rtx pat; |
343 | ||
344 | /* If this subroutine pops its own args, record that in the call insn | |
345 | if possible, for the sake of frame pointer elimination. */ | |
2c8da025 | 346 | |
51bbfa0c | 347 | if (valreg) |
325f5379 JJ |
348 | pat = GEN_CALL_VALUE_POP (valreg, funmem, rounded_stack_size_rtx, |
349 | next_arg_reg, n_pop); | |
51bbfa0c | 350 | else |
325f5379 JJ |
351 | pat = GEN_CALL_POP (funmem, rounded_stack_size_rtx, next_arg_reg, |
352 | n_pop); | |
51bbfa0c RS |
353 | |
354 | emit_call_insn (pat); | |
355 | already_popped = 1; | |
356 | } | |
357 | else | |
358 | #endif | |
51bbfa0c | 359 | |
0a1c58a2 JL |
360 | #if defined (HAVE_sibcall) && defined (HAVE_sibcall_value) |
361 | if ((ecf_flags & ECF_SIBCALL) | |
362 | && HAVE_sibcall && HAVE_sibcall_value) | |
363 | { | |
364 | if (valreg) | |
325f5379 | 365 | emit_call_insn (GEN_SIBCALL_VALUE (valreg, funmem, |
0a1c58a2 JL |
366 | rounded_stack_size_rtx, |
367 | next_arg_reg, NULL_RTX)); | |
368 | else | |
325f5379 JJ |
369 | emit_call_insn (GEN_SIBCALL (funmem, rounded_stack_size_rtx, |
370 | next_arg_reg, | |
0f900dfa | 371 | GEN_INT (struct_value_size))); |
0a1c58a2 JL |
372 | } |
373 | else | |
374 | #endif | |
375 | ||
51bbfa0c RS |
376 | #if defined (HAVE_call) && defined (HAVE_call_value) |
377 | if (HAVE_call && HAVE_call_value) | |
378 | { | |
379 | if (valreg) | |
325f5379 JJ |
380 | emit_call_insn (GEN_CALL_VALUE (valreg, funmem, rounded_stack_size_rtx, |
381 | next_arg_reg, NULL_RTX)); | |
51bbfa0c | 382 | else |
325f5379 | 383 | emit_call_insn (GEN_CALL (funmem, rounded_stack_size_rtx, next_arg_reg, |
0f900dfa | 384 | GEN_INT (struct_value_size))); |
51bbfa0c RS |
385 | } |
386 | else | |
387 | #endif | |
366de0ce | 388 | gcc_unreachable (); |
51bbfa0c | 389 | |
ee960939 OH |
390 | /* Find the call we just emitted. */ |
391 | call_insn = last_call_insn (); | |
51bbfa0c | 392 | |
325f5379 JJ |
393 | /* Some target create a fresh MEM instead of reusing the one provided |
394 | above. Set its MEM_EXPR. */ | |
da4fdf2d SB |
395 | call = get_call_rtx_from (call_insn); |
396 | if (call | |
325f5379 JJ |
397 | && MEM_EXPR (XEXP (call, 0)) == NULL_TREE |
398 | && MEM_EXPR (funmem) != NULL_TREE) | |
399 | set_mem_expr (XEXP (call, 0), MEM_EXPR (funmem)); | |
400 | ||
ee960939 OH |
401 | /* Put the register usage information there. */ |
402 | add_function_usage_to (call_insn, call_fusage); | |
51bbfa0c RS |
403 | |
404 | /* If this is a const call, then set the insn's unchanging bit. */ | |
becfd6e5 KZ |
405 | if (ecf_flags & ECF_CONST) |
406 | RTL_CONST_CALL_P (call_insn) = 1; | |
407 | ||
408 | /* If this is a pure call, then set the insn's unchanging bit. */ | |
409 | if (ecf_flags & ECF_PURE) | |
410 | RTL_PURE_CALL_P (call_insn) = 1; | |
411 | ||
412 | /* If this is a const call, then set the insn's unchanging bit. */ | |
413 | if (ecf_flags & ECF_LOOPING_CONST_OR_PURE) | |
414 | RTL_LOOPING_CONST_OR_PURE_CALL_P (call_insn) = 1; | |
51bbfa0c | 415 | |
1d65f45c RH |
416 | /* Create a nothrow REG_EH_REGION note, if needed. */ |
417 | make_reg_eh_region_note (call_insn, ecf_flags, 0); | |
12a22e76 | 418 | |
ca3920ad | 419 | if (ecf_flags & ECF_NORETURN) |
65c5f2a6 | 420 | add_reg_note (call_insn, REG_NORETURN, const0_rtx); |
ca3920ad | 421 | |
570a98eb | 422 | if (ecf_flags & ECF_RETURNS_TWICE) |
9defc9b7 | 423 | { |
65c5f2a6 | 424 | add_reg_note (call_insn, REG_SETJMP, const0_rtx); |
e3b5732b | 425 | cfun->calls_setjmp = 1; |
9defc9b7 | 426 | } |
570a98eb | 427 | |
0a1c58a2 JL |
428 | SIBLING_CALL_P (call_insn) = ((ecf_flags & ECF_SIBCALL) != 0); |
429 | ||
b1e64e0d RS |
430 | /* Restore this now, so that we do defer pops for this call's args |
431 | if the context of the call as a whole permits. */ | |
432 | inhibit_defer_pop = old_inhibit_defer_pop; | |
433 | ||
fb5eebb9 | 434 | if (n_popped > 0) |
51bbfa0c RS |
435 | { |
436 | if (!already_popped) | |
e3da301d | 437 | CALL_INSN_FUNCTION_USAGE (call_insn) |
38a448ca RH |
438 | = gen_rtx_EXPR_LIST (VOIDmode, |
439 | gen_rtx_CLOBBER (VOIDmode, stack_pointer_rtx), | |
440 | CALL_INSN_FUNCTION_USAGE (call_insn)); | |
fb5eebb9 | 441 | rounded_stack_size -= n_popped; |
062e7fd8 | 442 | rounded_stack_size_rtx = GEN_INT (rounded_stack_size); |
1503a7ec | 443 | stack_pointer_delta -= n_popped; |
2e3f842f | 444 | |
9a08d230 RH |
445 | add_reg_note (call_insn, REG_ARGS_SIZE, GEN_INT (stack_pointer_delta)); |
446 | ||
2e3f842f L |
447 | /* If popup is needed, stack realign must use DRAP */ |
448 | if (SUPPORTS_STACK_ALIGNMENT) | |
449 | crtl->need_drap = true; | |
51bbfa0c | 450 | } |
f8f75b16 JJ |
451 | /* For noreturn calls when not accumulating outgoing args force |
452 | REG_ARGS_SIZE note to prevent crossjumping of calls with different | |
453 | args sizes. */ | |
454 | else if (!ACCUMULATE_OUTGOING_ARGS && (ecf_flags & ECF_NORETURN) != 0) | |
455 | add_reg_note (call_insn, REG_ARGS_SIZE, GEN_INT (stack_pointer_delta)); | |
51bbfa0c | 456 | |
f73ad30e | 457 | if (!ACCUMULATE_OUTGOING_ARGS) |
51bbfa0c | 458 | { |
f73ad30e JH |
459 | /* If returning from the subroutine does not automatically pop the args, |
460 | we need an instruction to pop them sooner or later. | |
461 | Perhaps do it now; perhaps just record how much space to pop later. | |
462 | ||
463 | If returning from the subroutine does pop the args, indicate that the | |
464 | stack pointer will be changed. */ | |
465 | ||
f79a65c0 | 466 | if (rounded_stack_size != 0) |
f73ad30e | 467 | { |
9dd9bf80 | 468 | if (ecf_flags & ECF_NORETURN) |
f79a65c0 RK |
469 | /* Just pretend we did the pop. */ |
470 | stack_pointer_delta -= rounded_stack_size; | |
471 | else if (flag_defer_pop && inhibit_defer_pop == 0 | |
7393c642 | 472 | && ! (ecf_flags & (ECF_CONST | ECF_PURE))) |
f73ad30e JH |
473 | pending_stack_adjust += rounded_stack_size; |
474 | else | |
475 | adjust_stack (rounded_stack_size_rtx); | |
476 | } | |
51bbfa0c | 477 | } |
f73ad30e JH |
478 | /* When we accumulate outgoing args, we must avoid any stack manipulations. |
479 | Restore the stack pointer to its original value now. Usually | |
480 | ACCUMULATE_OUTGOING_ARGS targets don't get here, but there are exceptions. | |
481 | On i386 ACCUMULATE_OUTGOING_ARGS can be enabled on demand, and | |
482 | popping variants of functions exist as well. | |
483 | ||
484 | ??? We may optimize similar to defer_pop above, but it is | |
485 | probably not worthwhile. | |
f725a3ec | 486 | |
f73ad30e JH |
487 | ??? It will be worthwhile to enable combine_stack_adjustments even for |
488 | such machines. */ | |
489 | else if (n_popped) | |
490 | anti_adjust_stack (GEN_INT (n_popped)); | |
51bbfa0c RS |
491 | } |
492 | ||
20efdf74 JL |
493 | /* Determine if the function identified by NAME and FNDECL is one with |
494 | special properties we wish to know about. | |
495 | ||
496 | For example, if the function might return more than one time (setjmp), then | |
497 | set RETURNS_TWICE to a nonzero value. | |
498 | ||
bae802f9 | 499 | Similarly set NORETURN if the function is in the longjmp family. |
20efdf74 | 500 | |
20efdf74 JL |
501 | Set MAY_BE_ALLOCA for any memory allocation function that might allocate |
502 | space from the stack such as alloca. */ | |
503 | ||
f2d33f13 | 504 | static int |
6ea2b70d | 505 | special_function_p (const_tree fndecl, int flags) |
20efdf74 | 506 | { |
6de9cd9a | 507 | if (fndecl && DECL_NAME (fndecl) |
140592a0 | 508 | && IDENTIFIER_LENGTH (DECL_NAME (fndecl)) <= 17 |
20efdf74 JL |
509 | /* Exclude functions not at the file scope, or not `extern', |
510 | since they are not the magic functions we would otherwise | |
d1bd0ded | 511 | think they are. |
c22cacf3 MS |
512 | FIXME: this should be handled with attributes, not with this |
513 | hacky imitation of DECL_ASSEMBLER_NAME. It's (also) wrong | |
514 | because you can declare fork() inside a function if you | |
515 | wish. */ | |
7ae4ad28 | 516 | && (DECL_CONTEXT (fndecl) == NULL_TREE |
d1bd0ded GK |
517 | || TREE_CODE (DECL_CONTEXT (fndecl)) == TRANSLATION_UNIT_DECL) |
518 | && TREE_PUBLIC (fndecl)) | |
20efdf74 | 519 | { |
63ad61ed ZW |
520 | const char *name = IDENTIFIER_POINTER (DECL_NAME (fndecl)); |
521 | const char *tname = name; | |
20efdf74 | 522 | |
ca54603f JL |
523 | /* We assume that alloca will always be called by name. It |
524 | makes no sense to pass it as a pointer-to-function to | |
525 | anything that does not understand its behavior. */ | |
f2d33f13 JH |
526 | if (((IDENTIFIER_LENGTH (DECL_NAME (fndecl)) == 6 |
527 | && name[0] == 'a' | |
528 | && ! strcmp (name, "alloca")) | |
529 | || (IDENTIFIER_LENGTH (DECL_NAME (fndecl)) == 16 | |
530 | && name[0] == '_' | |
531 | && ! strcmp (name, "__builtin_alloca")))) | |
532 | flags |= ECF_MAY_BE_ALLOCA; | |
ca54603f | 533 | |
b545e411 | 534 | /* Disregard prefix _, __, __x or __builtin_. */ |
20efdf74 JL |
535 | if (name[0] == '_') |
536 | { | |
b545e411 JJ |
537 | if (name[1] == '_' |
538 | && name[2] == 'b' | |
539 | && !strncmp (name + 3, "uiltin_", 7)) | |
540 | tname += 10; | |
541 | else if (name[1] == '_' && name[2] == 'x') | |
20efdf74 JL |
542 | tname += 3; |
543 | else if (name[1] == '_') | |
544 | tname += 2; | |
545 | else | |
546 | tname += 1; | |
547 | } | |
548 | ||
549 | if (tname[0] == 's') | |
550 | { | |
f2d33f13 JH |
551 | if ((tname[1] == 'e' |
552 | && (! strcmp (tname, "setjmp") | |
553 | || ! strcmp (tname, "setjmp_syscall"))) | |
554 | || (tname[1] == 'i' | |
555 | && ! strcmp (tname, "sigsetjmp")) | |
556 | || (tname[1] == 'a' | |
557 | && ! strcmp (tname, "savectx"))) | |
3f8825c0 | 558 | flags |= ECF_RETURNS_TWICE | ECF_LEAF; |
f2d33f13 | 559 | |
20efdf74 JL |
560 | if (tname[1] == 'i' |
561 | && ! strcmp (tname, "siglongjmp")) | |
6e14af16 | 562 | flags |= ECF_NORETURN; |
20efdf74 JL |
563 | } |
564 | else if ((tname[0] == 'q' && tname[1] == 's' | |
565 | && ! strcmp (tname, "qsetjmp")) | |
566 | || (tname[0] == 'v' && tname[1] == 'f' | |
cd9ed4b4 EB |
567 | && ! strcmp (tname, "vfork")) |
568 | || (tname[0] == 'g' && tname[1] == 'e' | |
569 | && !strcmp (tname, "getcontext"))) | |
3f8825c0 | 570 | flags |= ECF_RETURNS_TWICE | ECF_LEAF; |
20efdf74 JL |
571 | |
572 | else if (tname[0] == 'l' && tname[1] == 'o' | |
573 | && ! strcmp (tname, "longjmp")) | |
6e14af16 | 574 | flags |= ECF_NORETURN; |
20efdf74 | 575 | } |
d1c38823 | 576 | |
f2d33f13 | 577 | return flags; |
20efdf74 JL |
578 | } |
579 | ||
e384e6b5 BS |
580 | /* Similar to special_function_p; return a set of ERF_ flags for the |
581 | function FNDECL. */ | |
582 | static int | |
583 | decl_return_flags (tree fndecl) | |
584 | { | |
585 | tree attr; | |
586 | tree type = TREE_TYPE (fndecl); | |
587 | if (!type) | |
588 | return 0; | |
589 | ||
590 | attr = lookup_attribute ("fn spec", TYPE_ATTRIBUTES (type)); | |
591 | if (!attr) | |
592 | return 0; | |
593 | ||
594 | attr = TREE_VALUE (TREE_VALUE (attr)); | |
595 | if (!attr || TREE_STRING_LENGTH (attr) < 1) | |
596 | return 0; | |
597 | ||
598 | switch (TREE_STRING_POINTER (attr)[0]) | |
599 | { | |
600 | case '1': | |
601 | case '2': | |
602 | case '3': | |
603 | case '4': | |
604 | return ERF_RETURNS_ARG | (TREE_STRING_POINTER (attr)[0] - '1'); | |
605 | ||
606 | case 'm': | |
607 | return ERF_NOALIAS; | |
608 | ||
609 | case '.': | |
610 | default: | |
611 | return 0; | |
612 | } | |
613 | } | |
614 | ||
bae802f9 | 615 | /* Return nonzero when FNDECL represents a call to setjmp. */ |
7393c642 | 616 | |
f2d33f13 | 617 | int |
6ea2b70d | 618 | setjmp_call_p (const_tree fndecl) |
f2d33f13 | 619 | { |
275311c4 MP |
620 | if (DECL_IS_RETURNS_TWICE (fndecl)) |
621 | return ECF_RETURNS_TWICE; | |
f2d33f13 JH |
622 | return special_function_p (fndecl, 0) & ECF_RETURNS_TWICE; |
623 | } | |
624 | ||
726a989a RB |
625 | |
626 | /* Return true if STMT is an alloca call. */ | |
627 | ||
628 | bool | |
629 | gimple_alloca_call_p (const_gimple stmt) | |
630 | { | |
631 | tree fndecl; | |
632 | ||
633 | if (!is_gimple_call (stmt)) | |
634 | return false; | |
635 | ||
636 | fndecl = gimple_call_fndecl (stmt); | |
637 | if (fndecl && (special_function_p (fndecl, 0) & ECF_MAY_BE_ALLOCA)) | |
638 | return true; | |
639 | ||
640 | return false; | |
641 | } | |
642 | ||
c986baf6 | 643 | /* Return true when exp contains alloca call. */ |
726a989a | 644 | |
c986baf6 | 645 | bool |
6ea2b70d | 646 | alloca_call_p (const_tree exp) |
c986baf6 | 647 | { |
2284b034 | 648 | tree fndecl; |
c986baf6 | 649 | if (TREE_CODE (exp) == CALL_EXPR |
2284b034 MG |
650 | && (fndecl = get_callee_fndecl (exp)) |
651 | && (special_function_p (fndecl, 0) & ECF_MAY_BE_ALLOCA)) | |
c986baf6 JH |
652 | return true; |
653 | return false; | |
654 | } | |
655 | ||
0a35513e AH |
656 | /* Return TRUE if FNDECL is either a TM builtin or a TM cloned |
657 | function. Return FALSE otherwise. */ | |
658 | ||
659 | static bool | |
660 | is_tm_builtin (const_tree fndecl) | |
661 | { | |
662 | if (fndecl == NULL) | |
663 | return false; | |
664 | ||
665 | if (decl_is_tm_clone (fndecl)) | |
666 | return true; | |
667 | ||
668 | if (DECL_BUILT_IN_CLASS (fndecl) == BUILT_IN_NORMAL) | |
669 | { | |
670 | switch (DECL_FUNCTION_CODE (fndecl)) | |
671 | { | |
672 | case BUILT_IN_TM_COMMIT: | |
673 | case BUILT_IN_TM_COMMIT_EH: | |
674 | case BUILT_IN_TM_ABORT: | |
675 | case BUILT_IN_TM_IRREVOCABLE: | |
676 | case BUILT_IN_TM_GETTMCLONE_IRR: | |
677 | case BUILT_IN_TM_MEMCPY: | |
678 | case BUILT_IN_TM_MEMMOVE: | |
679 | case BUILT_IN_TM_MEMSET: | |
680 | CASE_BUILT_IN_TM_STORE (1): | |
681 | CASE_BUILT_IN_TM_STORE (2): | |
682 | CASE_BUILT_IN_TM_STORE (4): | |
683 | CASE_BUILT_IN_TM_STORE (8): | |
684 | CASE_BUILT_IN_TM_STORE (FLOAT): | |
685 | CASE_BUILT_IN_TM_STORE (DOUBLE): | |
686 | CASE_BUILT_IN_TM_STORE (LDOUBLE): | |
687 | CASE_BUILT_IN_TM_STORE (M64): | |
688 | CASE_BUILT_IN_TM_STORE (M128): | |
689 | CASE_BUILT_IN_TM_STORE (M256): | |
690 | CASE_BUILT_IN_TM_LOAD (1): | |
691 | CASE_BUILT_IN_TM_LOAD (2): | |
692 | CASE_BUILT_IN_TM_LOAD (4): | |
693 | CASE_BUILT_IN_TM_LOAD (8): | |
694 | CASE_BUILT_IN_TM_LOAD (FLOAT): | |
695 | CASE_BUILT_IN_TM_LOAD (DOUBLE): | |
696 | CASE_BUILT_IN_TM_LOAD (LDOUBLE): | |
697 | CASE_BUILT_IN_TM_LOAD (M64): | |
698 | CASE_BUILT_IN_TM_LOAD (M128): | |
699 | CASE_BUILT_IN_TM_LOAD (M256): | |
700 | case BUILT_IN_TM_LOG: | |
701 | case BUILT_IN_TM_LOG_1: | |
702 | case BUILT_IN_TM_LOG_2: | |
703 | case BUILT_IN_TM_LOG_4: | |
704 | case BUILT_IN_TM_LOG_8: | |
705 | case BUILT_IN_TM_LOG_FLOAT: | |
706 | case BUILT_IN_TM_LOG_DOUBLE: | |
707 | case BUILT_IN_TM_LOG_LDOUBLE: | |
708 | case BUILT_IN_TM_LOG_M64: | |
709 | case BUILT_IN_TM_LOG_M128: | |
710 | case BUILT_IN_TM_LOG_M256: | |
711 | return true; | |
712 | default: | |
713 | break; | |
714 | } | |
715 | } | |
716 | return false; | |
717 | } | |
718 | ||
b5cd4ed4 | 719 | /* Detect flags (function attributes) from the function decl or type node. */ |
7393c642 | 720 | |
4977bab6 | 721 | int |
6ea2b70d | 722 | flags_from_decl_or_type (const_tree exp) |
f2d33f13 JH |
723 | { |
724 | int flags = 0; | |
36dbb93d | 725 | |
f2d33f13 JH |
726 | if (DECL_P (exp)) |
727 | { | |
728 | /* The function exp may have the `malloc' attribute. */ | |
36dbb93d | 729 | if (DECL_IS_MALLOC (exp)) |
f2d33f13 JH |
730 | flags |= ECF_MALLOC; |
731 | ||
6e9a3221 AN |
732 | /* The function exp may have the `returns_twice' attribute. */ |
733 | if (DECL_IS_RETURNS_TWICE (exp)) | |
734 | flags |= ECF_RETURNS_TWICE; | |
735 | ||
becfd6e5 | 736 | /* Process the pure and const attributes. */ |
9e3920e9 | 737 | if (TREE_READONLY (exp)) |
becfd6e5 KZ |
738 | flags |= ECF_CONST; |
739 | if (DECL_PURE_P (exp)) | |
e238ccac | 740 | flags |= ECF_PURE; |
becfd6e5 KZ |
741 | if (DECL_LOOPING_CONST_OR_PURE_P (exp)) |
742 | flags |= ECF_LOOPING_CONST_OR_PURE; | |
2a8f6b90 | 743 | |
dcd6de6d ZD |
744 | if (DECL_IS_NOVOPS (exp)) |
745 | flags |= ECF_NOVOPS; | |
46a4da10 JH |
746 | if (lookup_attribute ("leaf", DECL_ATTRIBUTES (exp))) |
747 | flags |= ECF_LEAF; | |
dcd6de6d | 748 | |
f2d33f13 JH |
749 | if (TREE_NOTHROW (exp)) |
750 | flags |= ECF_NOTHROW; | |
2b187c63 | 751 | |
0a35513e AH |
752 | if (flag_tm) |
753 | { | |
754 | if (is_tm_builtin (exp)) | |
755 | flags |= ECF_TM_BUILTIN; | |
fe924d9f | 756 | else if ((flags & (ECF_CONST|ECF_NOVOPS)) != 0 |
0a35513e AH |
757 | || lookup_attribute ("transaction_pure", |
758 | TYPE_ATTRIBUTES (TREE_TYPE (exp)))) | |
759 | flags |= ECF_TM_PURE; | |
760 | } | |
761 | ||
6de9cd9a | 762 | flags = special_function_p (exp, flags); |
f2d33f13 | 763 | } |
0a35513e AH |
764 | else if (TYPE_P (exp)) |
765 | { | |
766 | if (TYPE_READONLY (exp)) | |
767 | flags |= ECF_CONST; | |
768 | ||
769 | if (flag_tm | |
770 | && ((flags & ECF_CONST) != 0 | |
771 | || lookup_attribute ("transaction_pure", TYPE_ATTRIBUTES (exp)))) | |
772 | flags |= ECF_TM_PURE; | |
773 | } | |
17fc8d6f AH |
774 | else |
775 | gcc_unreachable (); | |
f2d33f13 JH |
776 | |
777 | if (TREE_THIS_VOLATILE (exp)) | |
9e3920e9 JJ |
778 | { |
779 | flags |= ECF_NORETURN; | |
780 | if (flags & (ECF_CONST|ECF_PURE)) | |
781 | flags |= ECF_LOOPING_CONST_OR_PURE; | |
782 | } | |
f2d33f13 JH |
783 | |
784 | return flags; | |
785 | } | |
786 | ||
f027e0a2 JM |
787 | /* Detect flags from a CALL_EXPR. */ |
788 | ||
789 | int | |
fa233e34 | 790 | call_expr_flags (const_tree t) |
f027e0a2 JM |
791 | { |
792 | int flags; | |
793 | tree decl = get_callee_fndecl (t); | |
794 | ||
795 | if (decl) | |
796 | flags = flags_from_decl_or_type (decl); | |
797 | else | |
798 | { | |
5039610b | 799 | t = TREE_TYPE (CALL_EXPR_FN (t)); |
f027e0a2 JM |
800 | if (t && TREE_CODE (t) == POINTER_TYPE) |
801 | flags = flags_from_decl_or_type (TREE_TYPE (t)); | |
802 | else | |
803 | flags = 0; | |
804 | } | |
805 | ||
806 | return flags; | |
807 | } | |
808 | ||
20efdf74 JL |
809 | /* Precompute all register parameters as described by ARGS, storing values |
810 | into fields within the ARGS array. | |
811 | ||
812 | NUM_ACTUALS indicates the total number elements in the ARGS array. | |
813 | ||
814 | Set REG_PARM_SEEN if we encounter a register parameter. */ | |
815 | ||
816 | static void | |
27e29549 RH |
817 | precompute_register_parameters (int num_actuals, struct arg_data *args, |
818 | int *reg_parm_seen) | |
20efdf74 JL |
819 | { |
820 | int i; | |
821 | ||
822 | *reg_parm_seen = 0; | |
823 | ||
824 | for (i = 0; i < num_actuals; i++) | |
825 | if (args[i].reg != 0 && ! args[i].pass_on_stack) | |
826 | { | |
827 | *reg_parm_seen = 1; | |
828 | ||
829 | if (args[i].value == 0) | |
830 | { | |
831 | push_temp_slots (); | |
84217346 | 832 | args[i].value = expand_normal (args[i].tree_value); |
20efdf74 JL |
833 | preserve_temp_slots (args[i].value); |
834 | pop_temp_slots (); | |
20efdf74 JL |
835 | } |
836 | ||
837 | /* If we are to promote the function arg to a wider mode, | |
838 | do it now. */ | |
839 | ||
840 | if (args[i].mode != TYPE_MODE (TREE_TYPE (args[i].tree_value))) | |
841 | args[i].value | |
842 | = convert_modes (args[i].mode, | |
843 | TYPE_MODE (TREE_TYPE (args[i].tree_value)), | |
844 | args[i].value, args[i].unsignedp); | |
845 | ||
a7adbbcb L |
846 | /* If the value is a non-legitimate constant, force it into a |
847 | pseudo now. TLS symbols sometimes need a call to resolve. */ | |
848 | if (CONSTANT_P (args[i].value) | |
849 | && !targetm.legitimate_constant_p (args[i].mode, args[i].value)) | |
850 | args[i].value = force_reg (args[i].mode, args[i].value); | |
851 | ||
27e29549 RH |
852 | /* If we're going to have to load the value by parts, pull the |
853 | parts into pseudos. The part extraction process can involve | |
854 | non-trivial computation. */ | |
855 | if (GET_CODE (args[i].reg) == PARALLEL) | |
856 | { | |
857 | tree type = TREE_TYPE (args[i].tree_value); | |
8df3dbb7 | 858 | args[i].parallel_value |
27e29549 RH |
859 | = emit_group_load_into_temps (args[i].reg, args[i].value, |
860 | type, int_size_in_bytes (type)); | |
861 | } | |
862 | ||
f725a3ec | 863 | /* If the value is expensive, and we are inside an appropriately |
20efdf74 JL |
864 | short loop, put the value into a pseudo and then put the pseudo |
865 | into the hard reg. | |
866 | ||
867 | For small register classes, also do this if this call uses | |
868 | register parameters. This is to avoid reload conflicts while | |
869 | loading the parameters registers. */ | |
870 | ||
27e29549 RH |
871 | else if ((! (REG_P (args[i].value) |
872 | || (GET_CODE (args[i].value) == SUBREG | |
873 | && REG_P (SUBREG_REG (args[i].value))))) | |
874 | && args[i].mode != BLKmode | |
5e8f01f4 | 875 | && set_src_cost (args[i].value, optimize_insn_for_speed_p ()) |
f40751dd | 876 | > COSTS_N_INSNS (1) |
42db504c SB |
877 | && ((*reg_parm_seen |
878 | && targetm.small_register_classes_for_mode_p (args[i].mode)) | |
27e29549 | 879 | || optimize)) |
20efdf74 JL |
880 | args[i].value = copy_to_mode_reg (args[i].mode, args[i].value); |
881 | } | |
882 | } | |
883 | ||
f73ad30e | 884 | #ifdef REG_PARM_STACK_SPACE |
20efdf74 JL |
885 | |
886 | /* The argument list is the property of the called routine and it | |
887 | may clobber it. If the fixed area has been used for previous | |
888 | parameters, we must save and restore it. */ | |
3bdf5ad1 | 889 | |
20efdf74 | 890 | static rtx |
d329e058 | 891 | save_fixed_argument_area (int reg_parm_stack_space, rtx argblock, int *low_to_save, int *high_to_save) |
20efdf74 | 892 | { |
b820d2b8 AM |
893 | int low; |
894 | int high; | |
20efdf74 | 895 | |
b820d2b8 AM |
896 | /* Compute the boundary of the area that needs to be saved, if any. */ |
897 | high = reg_parm_stack_space; | |
20efdf74 | 898 | #ifdef ARGS_GROW_DOWNWARD |
b820d2b8 | 899 | high += 1; |
20efdf74 | 900 | #endif |
b820d2b8 AM |
901 | if (high > highest_outgoing_arg_in_use) |
902 | high = highest_outgoing_arg_in_use; | |
20efdf74 | 903 | |
b820d2b8 AM |
904 | for (low = 0; low < high; low++) |
905 | if (stack_usage_map[low] != 0) | |
906 | { | |
907 | int num_to_save; | |
908 | enum machine_mode save_mode; | |
909 | int delta; | |
0a81f074 | 910 | rtx addr; |
b820d2b8 AM |
911 | rtx stack_area; |
912 | rtx save_area; | |
20efdf74 | 913 | |
b820d2b8 AM |
914 | while (stack_usage_map[--high] == 0) |
915 | ; | |
20efdf74 | 916 | |
b820d2b8 AM |
917 | *low_to_save = low; |
918 | *high_to_save = high; | |
919 | ||
920 | num_to_save = high - low + 1; | |
921 | save_mode = mode_for_size (num_to_save * BITS_PER_UNIT, MODE_INT, 1); | |
20efdf74 | 922 | |
b820d2b8 AM |
923 | /* If we don't have the required alignment, must do this |
924 | in BLKmode. */ | |
925 | if ((low & (MIN (GET_MODE_SIZE (save_mode), | |
926 | BIGGEST_ALIGNMENT / UNITS_PER_WORD) - 1))) | |
927 | save_mode = BLKmode; | |
20efdf74 JL |
928 | |
929 | #ifdef ARGS_GROW_DOWNWARD | |
b820d2b8 | 930 | delta = -high; |
20efdf74 | 931 | #else |
b820d2b8 | 932 | delta = low; |
20efdf74 | 933 | #endif |
0a81f074 RS |
934 | addr = plus_constant (Pmode, argblock, delta); |
935 | stack_area = gen_rtx_MEM (save_mode, memory_address (save_mode, addr)); | |
8ac61af7 | 936 | |
b820d2b8 AM |
937 | set_mem_align (stack_area, PARM_BOUNDARY); |
938 | if (save_mode == BLKmode) | |
939 | { | |
9474e8ab | 940 | save_area = assign_stack_temp (BLKmode, num_to_save); |
b820d2b8 AM |
941 | emit_block_move (validize_mem (save_area), stack_area, |
942 | GEN_INT (num_to_save), BLOCK_OP_CALL_PARM); | |
943 | } | |
944 | else | |
945 | { | |
946 | save_area = gen_reg_rtx (save_mode); | |
947 | emit_move_insn (save_area, stack_area); | |
948 | } | |
8ac61af7 | 949 | |
b820d2b8 AM |
950 | return save_area; |
951 | } | |
952 | ||
953 | return NULL_RTX; | |
20efdf74 JL |
954 | } |
955 | ||
956 | static void | |
d329e058 | 957 | restore_fixed_argument_area (rtx save_area, rtx argblock, int high_to_save, int low_to_save) |
20efdf74 JL |
958 | { |
959 | enum machine_mode save_mode = GET_MODE (save_area); | |
b820d2b8 | 960 | int delta; |
0a81f074 | 961 | rtx addr, stack_area; |
b820d2b8 | 962 | |
20efdf74 | 963 | #ifdef ARGS_GROW_DOWNWARD |
b820d2b8 | 964 | delta = -high_to_save; |
20efdf74 | 965 | #else |
b820d2b8 | 966 | delta = low_to_save; |
20efdf74 | 967 | #endif |
0a81f074 RS |
968 | addr = plus_constant (Pmode, argblock, delta); |
969 | stack_area = gen_rtx_MEM (save_mode, memory_address (save_mode, addr)); | |
b820d2b8 | 970 | set_mem_align (stack_area, PARM_BOUNDARY); |
20efdf74 JL |
971 | |
972 | if (save_mode != BLKmode) | |
973 | emit_move_insn (stack_area, save_area); | |
974 | else | |
44bb111a RH |
975 | emit_block_move (stack_area, validize_mem (save_area), |
976 | GEN_INT (high_to_save - low_to_save + 1), | |
977 | BLOCK_OP_CALL_PARM); | |
20efdf74 | 978 | } |
19652adf | 979 | #endif /* REG_PARM_STACK_SPACE */ |
f725a3ec | 980 | |
20efdf74 JL |
981 | /* If any elements in ARGS refer to parameters that are to be passed in |
982 | registers, but not in memory, and whose alignment does not permit a | |
983 | direct copy into registers. Copy the values into a group of pseudos | |
f725a3ec | 984 | which we will later copy into the appropriate hard registers. |
8e6a59fe MM |
985 | |
986 | Pseudos for each unaligned argument will be stored into the array | |
987 | args[argnum].aligned_regs. The caller is responsible for deallocating | |
988 | the aligned_regs array if it is nonzero. */ | |
989 | ||
20efdf74 | 990 | static void |
d329e058 | 991 | store_unaligned_arguments_into_pseudos (struct arg_data *args, int num_actuals) |
20efdf74 JL |
992 | { |
993 | int i, j; | |
f725a3ec | 994 | |
20efdf74 JL |
995 | for (i = 0; i < num_actuals; i++) |
996 | if (args[i].reg != 0 && ! args[i].pass_on_stack | |
a7973050 | 997 | && GET_CODE (args[i].reg) != PARALLEL |
20efdf74 | 998 | && args[i].mode == BLKmode |
852d22b4 EB |
999 | && MEM_P (args[i].value) |
1000 | && (MEM_ALIGN (args[i].value) | |
20efdf74 JL |
1001 | < (unsigned int) MIN (BIGGEST_ALIGNMENT, BITS_PER_WORD))) |
1002 | { | |
1003 | int bytes = int_size_in_bytes (TREE_TYPE (args[i].tree_value)); | |
6e985040 | 1004 | int endian_correction = 0; |
20efdf74 | 1005 | |
78a52f11 RH |
1006 | if (args[i].partial) |
1007 | { | |
1008 | gcc_assert (args[i].partial % UNITS_PER_WORD == 0); | |
1009 | args[i].n_aligned_regs = args[i].partial / UNITS_PER_WORD; | |
1010 | } | |
1011 | else | |
1012 | { | |
1013 | args[i].n_aligned_regs | |
1014 | = (bytes + UNITS_PER_WORD - 1) / UNITS_PER_WORD; | |
1015 | } | |
1016 | ||
5ed6ace5 | 1017 | args[i].aligned_regs = XNEWVEC (rtx, args[i].n_aligned_regs); |
20efdf74 | 1018 | |
6e985040 AM |
1019 | /* Structures smaller than a word are normally aligned to the |
1020 | least significant byte. On a BYTES_BIG_ENDIAN machine, | |
20efdf74 JL |
1021 | this means we must skip the empty high order bytes when |
1022 | calculating the bit offset. */ | |
6e985040 AM |
1023 | if (bytes < UNITS_PER_WORD |
1024 | #ifdef BLOCK_REG_PADDING | |
1025 | && (BLOCK_REG_PADDING (args[i].mode, | |
1026 | TREE_TYPE (args[i].tree_value), 1) | |
1027 | == downward) | |
1028 | #else | |
1029 | && BYTES_BIG_ENDIAN | |
1030 | #endif | |
1031 | ) | |
1032 | endian_correction = BITS_PER_WORD - bytes * BITS_PER_UNIT; | |
20efdf74 JL |
1033 | |
1034 | for (j = 0; j < args[i].n_aligned_regs; j++) | |
1035 | { | |
1036 | rtx reg = gen_reg_rtx (word_mode); | |
1037 | rtx word = operand_subword_force (args[i].value, j, BLKmode); | |
1038 | int bitsize = MIN (bytes * BITS_PER_UNIT, BITS_PER_WORD); | |
20efdf74 JL |
1039 | |
1040 | args[i].aligned_regs[j] = reg; | |
c6285bd7 | 1041 | word = extract_bit_field (word, bitsize, 0, 1, NULL_RTX, |
b3520980 | 1042 | word_mode, word_mode); |
20efdf74 JL |
1043 | |
1044 | /* There is no need to restrict this code to loading items | |
1045 | in TYPE_ALIGN sized hunks. The bitfield instructions can | |
1046 | load up entire word sized registers efficiently. | |
1047 | ||
1048 | ??? This may not be needed anymore. | |
1049 | We use to emit a clobber here but that doesn't let later | |
1050 | passes optimize the instructions we emit. By storing 0 into | |
1051 | the register later passes know the first AND to zero out the | |
1052 | bitfield being set in the register is unnecessary. The store | |
1053 | of 0 will be deleted as will at least the first AND. */ | |
1054 | ||
1055 | emit_move_insn (reg, const0_rtx); | |
1056 | ||
1057 | bytes -= bitsize / BITS_PER_UNIT; | |
1169e45d AH |
1058 | store_bit_field (reg, bitsize, endian_correction, 0, 0, |
1059 | word_mode, word); | |
20efdf74 JL |
1060 | } |
1061 | } | |
1062 | } | |
1063 | ||
d7cdf113 | 1064 | /* Fill in ARGS_SIZE and ARGS array based on the parameters found in |
b8698a0f | 1065 | CALL_EXPR EXP. |
d7cdf113 JL |
1066 | |
1067 | NUM_ACTUALS is the total number of parameters. | |
1068 | ||
1069 | N_NAMED_ARGS is the total number of named arguments. | |
1070 | ||
078a18a4 SL |
1071 | STRUCT_VALUE_ADDR_VALUE is the implicit argument for a struct return |
1072 | value, or null. | |
1073 | ||
d7cdf113 JL |
1074 | FNDECL is the tree code for the target of this call (if known) |
1075 | ||
1076 | ARGS_SO_FAR holds state needed by the target to know where to place | |
1077 | the next argument. | |
1078 | ||
1079 | REG_PARM_STACK_SPACE is the number of bytes of stack space reserved | |
1080 | for arguments which are passed in registers. | |
1081 | ||
1082 | OLD_STACK_LEVEL is a pointer to an rtx which olds the old stack level | |
1083 | and may be modified by this routine. | |
1084 | ||
f2d33f13 | 1085 | OLD_PENDING_ADJ, MUST_PREALLOCATE and FLAGS are pointers to integer |
7ae4ad28 | 1086 | flags which may may be modified by this routine. |
dd292d0a | 1087 | |
6de9cd9a DN |
1088 | MAY_TAILCALL is cleared if we encounter an invisible pass-by-reference |
1089 | that requires allocation of stack space. | |
1090 | ||
dd292d0a MM |
1091 | CALL_FROM_THUNK_P is true if this call is the jump from a thunk to |
1092 | the thunked-to function. */ | |
d7cdf113 JL |
1093 | |
1094 | static void | |
d329e058 AJ |
1095 | initialize_argument_information (int num_actuals ATTRIBUTE_UNUSED, |
1096 | struct arg_data *args, | |
1097 | struct args_size *args_size, | |
1098 | int n_named_args ATTRIBUTE_UNUSED, | |
078a18a4 | 1099 | tree exp, tree struct_value_addr_value, |
45769134 | 1100 | tree fndecl, tree fntype, |
d5cc9181 | 1101 | cumulative_args_t args_so_far, |
d329e058 AJ |
1102 | int reg_parm_stack_space, |
1103 | rtx *old_stack_level, int *old_pending_adj, | |
dd292d0a | 1104 | int *must_preallocate, int *ecf_flags, |
6de9cd9a | 1105 | bool *may_tailcall, bool call_from_thunk_p) |
d7cdf113 | 1106 | { |
d5cc9181 | 1107 | CUMULATIVE_ARGS *args_so_far_pnt = get_cumulative_args (args_so_far); |
db3927fb | 1108 | location_t loc = EXPR_LOCATION (exp); |
d7cdf113 JL |
1109 | |
1110 | /* Count arg position in order args appear. */ | |
1111 | int argpos; | |
1112 | ||
1113 | int i; | |
f725a3ec | 1114 | |
d7cdf113 JL |
1115 | args_size->constant = 0; |
1116 | args_size->var = 0; | |
1117 | ||
1118 | /* In this loop, we consider args in the order they are written. | |
3d9684ae | 1119 | We fill up ARGS from the back. */ |
d7cdf113 | 1120 | |
3d9684ae | 1121 | i = num_actuals - 1; |
078a18a4 SL |
1122 | { |
1123 | int j = i; | |
1124 | call_expr_arg_iterator iter; | |
1125 | tree arg; | |
1126 | ||
1127 | if (struct_value_addr_value) | |
1128 | { | |
1129 | args[j].tree_value = struct_value_addr_value; | |
3d9684ae | 1130 | j--; |
078a18a4 SL |
1131 | } |
1132 | FOR_EACH_CALL_EXPR_ARG (arg, iter, exp) | |
1133 | { | |
1134 | tree argtype = TREE_TYPE (arg); | |
1135 | if (targetm.calls.split_complex_arg | |
1136 | && argtype | |
1137 | && TREE_CODE (argtype) == COMPLEX_TYPE | |
1138 | && targetm.calls.split_complex_arg (argtype)) | |
1139 | { | |
1140 | tree subtype = TREE_TYPE (argtype); | |
078a18a4 | 1141 | args[j].tree_value = build1 (REALPART_EXPR, subtype, arg); |
3d9684ae | 1142 | j--; |
078a18a4 SL |
1143 | args[j].tree_value = build1 (IMAGPART_EXPR, subtype, arg); |
1144 | } | |
1145 | else | |
1146 | args[j].tree_value = arg; | |
3d9684ae | 1147 | j--; |
078a18a4 SL |
1148 | } |
1149 | } | |
1150 | ||
d7cdf113 | 1151 | /* I counts args in order (to be) pushed; ARGPOS counts in order written. */ |
3d9684ae | 1152 | for (argpos = 0; argpos < num_actuals; i--, argpos++) |
d7cdf113 | 1153 | { |
078a18a4 | 1154 | tree type = TREE_TYPE (args[i].tree_value); |
d7cdf113 JL |
1155 | int unsignedp; |
1156 | enum machine_mode mode; | |
1157 | ||
d7cdf113 | 1158 | /* Replace erroneous argument with constant zero. */ |
d0f062fb | 1159 | if (type == error_mark_node || !COMPLETE_TYPE_P (type)) |
d7cdf113 JL |
1160 | args[i].tree_value = integer_zero_node, type = integer_type_node; |
1161 | ||
ebf0bf7f JJ |
1162 | /* If TYPE is a transparent union or record, pass things the way |
1163 | we would pass the first field of the union or record. We have | |
1164 | already verified that the modes are the same. */ | |
1165 | if ((TREE_CODE (type) == UNION_TYPE || TREE_CODE (type) == RECORD_TYPE) | |
1166 | && TYPE_TRANSPARENT_AGGR (type)) | |
1167 | type = TREE_TYPE (first_field (type)); | |
d7cdf113 JL |
1168 | |
1169 | /* Decide where to pass this arg. | |
1170 | ||
1171 | args[i].reg is nonzero if all or part is passed in registers. | |
1172 | ||
1173 | args[i].partial is nonzero if part but not all is passed in registers, | |
78a52f11 | 1174 | and the exact value says how many bytes are passed in registers. |
d7cdf113 JL |
1175 | |
1176 | args[i].pass_on_stack is nonzero if the argument must at least be | |
1177 | computed on the stack. It may then be loaded back into registers | |
1178 | if args[i].reg is nonzero. | |
1179 | ||
1180 | These decisions are driven by the FUNCTION_... macros and must agree | |
1181 | with those made by function.c. */ | |
1182 | ||
1183 | /* See if this argument should be passed by invisible reference. */ | |
d5cc9181 | 1184 | if (pass_by_reference (args_so_far_pnt, TYPE_MODE (type), |
0976078c | 1185 | type, argpos < n_named_args)) |
d7cdf113 | 1186 | { |
9969aaf6 | 1187 | bool callee_copies; |
d6e1acf6 | 1188 | tree base = NULL_TREE; |
9969aaf6 RH |
1189 | |
1190 | callee_copies | |
d5cc9181 | 1191 | = reference_callee_copied (args_so_far_pnt, TYPE_MODE (type), |
6cdd5672 | 1192 | type, argpos < n_named_args); |
9969aaf6 RH |
1193 | |
1194 | /* If we're compiling a thunk, pass through invisible references | |
1195 | instead of making a copy. */ | |
dd292d0a | 1196 | if (call_from_thunk_p |
9969aaf6 RH |
1197 | || (callee_copies |
1198 | && !TREE_ADDRESSABLE (type) | |
1199 | && (base = get_base_address (args[i].tree_value)) | |
9c3d55b4 | 1200 | && TREE_CODE (base) != SSA_NAME |
9969aaf6 | 1201 | && (!DECL_P (base) || MEM_P (DECL_RTL (base))))) |
d7cdf113 | 1202 | { |
c4b9a87e ER |
1203 | mark_addressable (args[i].tree_value); |
1204 | ||
9969aaf6 RH |
1205 | /* We can't use sibcalls if a callee-copied argument is |
1206 | stored in the current function's frame. */ | |
1207 | if (!call_from_thunk_p && DECL_P (base) && !TREE_STATIC (base)) | |
9fd47435 RS |
1208 | *may_tailcall = false; |
1209 | ||
db3927fb AH |
1210 | args[i].tree_value = build_fold_addr_expr_loc (loc, |
1211 | args[i].tree_value); | |
9969aaf6 RH |
1212 | type = TREE_TYPE (args[i].tree_value); |
1213 | ||
becfd6e5 KZ |
1214 | if (*ecf_flags & ECF_CONST) |
1215 | *ecf_flags &= ~(ECF_CONST | ECF_LOOPING_CONST_OR_PURE); | |
f21add07 | 1216 | } |
d7cdf113 JL |
1217 | else |
1218 | { | |
1219 | /* We make a copy of the object and pass the address to the | |
1220 | function being called. */ | |
1221 | rtx copy; | |
1222 | ||
d0f062fb | 1223 | if (!COMPLETE_TYPE_P (type) |
b38f3813 EB |
1224 | || TREE_CODE (TYPE_SIZE_UNIT (type)) != INTEGER_CST |
1225 | || (flag_stack_check == GENERIC_STACK_CHECK | |
1226 | && compare_tree_int (TYPE_SIZE_UNIT (type), | |
1227 | STACK_CHECK_MAX_VAR_SIZE) > 0)) | |
d7cdf113 JL |
1228 | { |
1229 | /* This is a variable-sized object. Make space on the stack | |
1230 | for it. */ | |
078a18a4 | 1231 | rtx size_rtx = expr_size (args[i].tree_value); |
d7cdf113 JL |
1232 | |
1233 | if (*old_stack_level == 0) | |
1234 | { | |
9eac0f2a | 1235 | emit_stack_save (SAVE_BLOCK, old_stack_level); |
d7cdf113 JL |
1236 | *old_pending_adj = pending_stack_adjust; |
1237 | pending_stack_adjust = 0; | |
1238 | } | |
1239 | ||
d3c12306 EB |
1240 | /* We can pass TRUE as the 4th argument because we just |
1241 | saved the stack pointer and will restore it right after | |
1242 | the call. */ | |
3a42502d RH |
1243 | copy = allocate_dynamic_stack_space (size_rtx, |
1244 | TYPE_ALIGN (type), | |
1245 | TYPE_ALIGN (type), | |
1246 | true); | |
1247 | copy = gen_rtx_MEM (BLKmode, copy); | |
3bdf5ad1 | 1248 | set_mem_attributes (copy, type, 1); |
d7cdf113 JL |
1249 | } |
1250 | else | |
9474e8ab | 1251 | copy = assign_temp (type, 1, 0); |
d7cdf113 | 1252 | |
79f5e442 | 1253 | store_expr (args[i].tree_value, copy, 0, false); |
d7cdf113 | 1254 | |
becfd6e5 KZ |
1255 | /* Just change the const function to pure and then let |
1256 | the next test clear the pure based on | |
1257 | callee_copies. */ | |
1258 | if (*ecf_flags & ECF_CONST) | |
1259 | { | |
1260 | *ecf_flags &= ~ECF_CONST; | |
1261 | *ecf_flags |= ECF_PURE; | |
1262 | } | |
1263 | ||
1264 | if (!callee_copies && *ecf_flags & ECF_PURE) | |
1265 | *ecf_flags &= ~(ECF_PURE | ECF_LOOPING_CONST_OR_PURE); | |
9969aaf6 RH |
1266 | |
1267 | args[i].tree_value | |
db3927fb | 1268 | = build_fold_addr_expr_loc (loc, make_tree (type, copy)); |
9969aaf6 | 1269 | type = TREE_TYPE (args[i].tree_value); |
6de9cd9a | 1270 | *may_tailcall = false; |
d7cdf113 JL |
1271 | } |
1272 | } | |
1273 | ||
8df83eae | 1274 | unsignedp = TYPE_UNSIGNED (type); |
cde0f3fd PB |
1275 | mode = promote_function_mode (type, TYPE_MODE (type), &unsignedp, |
1276 | fndecl ? TREE_TYPE (fndecl) : fntype, 0); | |
d7cdf113 JL |
1277 | |
1278 | args[i].unsignedp = unsignedp; | |
1279 | args[i].mode = mode; | |
7d167afd | 1280 | |
3c07301f NF |
1281 | args[i].reg = targetm.calls.function_arg (args_so_far, mode, type, |
1282 | argpos < n_named_args); | |
1283 | ||
7d167afd JJ |
1284 | /* If this is a sibling call and the machine has register windows, the |
1285 | register window has to be unwinded before calling the routine, so | |
1286 | arguments have to go into the incoming registers. */ | |
3c07301f NF |
1287 | if (targetm.calls.function_incoming_arg != targetm.calls.function_arg) |
1288 | args[i].tail_call_reg | |
1289 | = targetm.calls.function_incoming_arg (args_so_far, mode, type, | |
1290 | argpos < n_named_args); | |
1291 | else | |
1292 | args[i].tail_call_reg = args[i].reg; | |
7d167afd | 1293 | |
d7cdf113 JL |
1294 | if (args[i].reg) |
1295 | args[i].partial | |
78a52f11 RH |
1296 | = targetm.calls.arg_partial_bytes (args_so_far, mode, type, |
1297 | argpos < n_named_args); | |
d7cdf113 | 1298 | |
fe984136 | 1299 | args[i].pass_on_stack = targetm.calls.must_pass_in_stack (mode, type); |
d7cdf113 JL |
1300 | |
1301 | /* If FUNCTION_ARG returned a (parallel [(expr_list (nil) ...) ...]), | |
1302 | it means that we are to pass this arg in the register(s) designated | |
1303 | by the PARALLEL, but also to pass it in the stack. */ | |
1304 | if (args[i].reg && GET_CODE (args[i].reg) == PARALLEL | |
1305 | && XEXP (XVECEXP (args[i].reg, 0, 0), 0) == 0) | |
1306 | args[i].pass_on_stack = 1; | |
1307 | ||
1308 | /* If this is an addressable type, we must preallocate the stack | |
1309 | since we must evaluate the object into its final location. | |
1310 | ||
1311 | If this is to be passed in both registers and the stack, it is simpler | |
1312 | to preallocate. */ | |
1313 | if (TREE_ADDRESSABLE (type) | |
1314 | || (args[i].pass_on_stack && args[i].reg != 0)) | |
1315 | *must_preallocate = 1; | |
1316 | ||
d7cdf113 JL |
1317 | /* Compute the stack-size of this argument. */ |
1318 | if (args[i].reg == 0 || args[i].partial != 0 | |
1319 | || reg_parm_stack_space > 0 | |
1320 | || args[i].pass_on_stack) | |
1321 | locate_and_pad_parm (mode, type, | |
1322 | #ifdef STACK_PARMS_IN_REG_PARM_AREA | |
1323 | 1, | |
1324 | #else | |
1325 | args[i].reg != 0, | |
1326 | #endif | |
2e4ceca5 | 1327 | reg_parm_stack_space, |
e7949876 AM |
1328 | args[i].pass_on_stack ? 0 : args[i].partial, |
1329 | fndecl, args_size, &args[i].locate); | |
648bb159 RS |
1330 | #ifdef BLOCK_REG_PADDING |
1331 | else | |
1332 | /* The argument is passed entirely in registers. See at which | |
1333 | end it should be padded. */ | |
1334 | args[i].locate.where_pad = | |
1335 | BLOCK_REG_PADDING (mode, type, | |
1336 | int_size_in_bytes (type) <= UNITS_PER_WORD); | |
1337 | #endif | |
f725a3ec | 1338 | |
d7cdf113 JL |
1339 | /* Update ARGS_SIZE, the total stack space for args so far. */ |
1340 | ||
e7949876 AM |
1341 | args_size->constant += args[i].locate.size.constant; |
1342 | if (args[i].locate.size.var) | |
1343 | ADD_PARM_SIZE (*args_size, args[i].locate.size.var); | |
d7cdf113 JL |
1344 | |
1345 | /* Increment ARGS_SO_FAR, which has info about which arg-registers | |
1346 | have been used, etc. */ | |
1347 | ||
3c07301f NF |
1348 | targetm.calls.function_arg_advance (args_so_far, TYPE_MODE (type), |
1349 | type, argpos < n_named_args); | |
d7cdf113 JL |
1350 | } |
1351 | } | |
1352 | ||
599f37b6 JL |
1353 | /* Update ARGS_SIZE to contain the total size for the argument block. |
1354 | Return the original constant component of the argument block's size. | |
1355 | ||
1356 | REG_PARM_STACK_SPACE holds the number of bytes of stack space reserved | |
1357 | for arguments passed in registers. */ | |
1358 | ||
1359 | static int | |
d329e058 AJ |
1360 | compute_argument_block_size (int reg_parm_stack_space, |
1361 | struct args_size *args_size, | |
033df0b9 | 1362 | tree fndecl ATTRIBUTE_UNUSED, |
5d059ed9 | 1363 | tree fntype ATTRIBUTE_UNUSED, |
d329e058 | 1364 | int preferred_stack_boundary ATTRIBUTE_UNUSED) |
599f37b6 JL |
1365 | { |
1366 | int unadjusted_args_size = args_size->constant; | |
1367 | ||
f73ad30e JH |
1368 | /* For accumulate outgoing args mode we don't need to align, since the frame |
1369 | will be already aligned. Align to STACK_BOUNDARY in order to prevent | |
f5143c46 | 1370 | backends from generating misaligned frame sizes. */ |
f73ad30e JH |
1371 | if (ACCUMULATE_OUTGOING_ARGS && preferred_stack_boundary > STACK_BOUNDARY) |
1372 | preferred_stack_boundary = STACK_BOUNDARY; | |
f73ad30e | 1373 | |
599f37b6 JL |
1374 | /* Compute the actual size of the argument block required. The variable |
1375 | and constant sizes must be combined, the size may have to be rounded, | |
1376 | and there may be a minimum required size. */ | |
1377 | ||
1378 | if (args_size->var) | |
1379 | { | |
1380 | args_size->var = ARGS_SIZE_TREE (*args_size); | |
1381 | args_size->constant = 0; | |
1382 | ||
c2f8b491 JH |
1383 | preferred_stack_boundary /= BITS_PER_UNIT; |
1384 | if (preferred_stack_boundary > 1) | |
1503a7ec JH |
1385 | { |
1386 | /* We don't handle this case yet. To handle it correctly we have | |
f5143c46 | 1387 | to add the delta, round and subtract the delta. |
1503a7ec | 1388 | Currently no machine description requires this support. */ |
366de0ce | 1389 | gcc_assert (!(stack_pointer_delta & (preferred_stack_boundary - 1))); |
1503a7ec JH |
1390 | args_size->var = round_up (args_size->var, preferred_stack_boundary); |
1391 | } | |
599f37b6 JL |
1392 | |
1393 | if (reg_parm_stack_space > 0) | |
1394 | { | |
1395 | args_size->var | |
1396 | = size_binop (MAX_EXPR, args_size->var, | |
fed3cef0 | 1397 | ssize_int (reg_parm_stack_space)); |
599f37b6 | 1398 | |
599f37b6 JL |
1399 | /* The area corresponding to register parameters is not to count in |
1400 | the size of the block we need. So make the adjustment. */ | |
5d059ed9 | 1401 | if (! OUTGOING_REG_PARM_STACK_SPACE ((!fndecl ? fntype : TREE_TYPE (fndecl)))) |
ac294f0b KT |
1402 | args_size->var |
1403 | = size_binop (MINUS_EXPR, args_size->var, | |
1404 | ssize_int (reg_parm_stack_space)); | |
599f37b6 JL |
1405 | } |
1406 | } | |
1407 | else | |
1408 | { | |
c2f8b491 | 1409 | preferred_stack_boundary /= BITS_PER_UNIT; |
0a1c58a2 JL |
1410 | if (preferred_stack_boundary < 1) |
1411 | preferred_stack_boundary = 1; | |
fb5eebb9 | 1412 | args_size->constant = (((args_size->constant |
1503a7ec | 1413 | + stack_pointer_delta |
c2f8b491 JH |
1414 | + preferred_stack_boundary - 1) |
1415 | / preferred_stack_boundary | |
1416 | * preferred_stack_boundary) | |
1503a7ec | 1417 | - stack_pointer_delta); |
599f37b6 JL |
1418 | |
1419 | args_size->constant = MAX (args_size->constant, | |
1420 | reg_parm_stack_space); | |
1421 | ||
5d059ed9 | 1422 | if (! OUTGOING_REG_PARM_STACK_SPACE ((!fndecl ? fntype : TREE_TYPE (fndecl)))) |
ac294f0b | 1423 | args_size->constant -= reg_parm_stack_space; |
599f37b6 JL |
1424 | } |
1425 | return unadjusted_args_size; | |
1426 | } | |
1427 | ||
19832c77 | 1428 | /* Precompute parameters as needed for a function call. |
cc0b1adc | 1429 | |
f2d33f13 | 1430 | FLAGS is mask of ECF_* constants. |
cc0b1adc | 1431 | |
cc0b1adc JL |
1432 | NUM_ACTUALS is the number of arguments. |
1433 | ||
f725a3ec KH |
1434 | ARGS is an array containing information for each argument; this |
1435 | routine fills in the INITIAL_VALUE and VALUE fields for each | |
1436 | precomputed argument. */ | |
cc0b1adc JL |
1437 | |
1438 | static void | |
84b8030f | 1439 | precompute_arguments (int num_actuals, struct arg_data *args) |
cc0b1adc JL |
1440 | { |
1441 | int i; | |
1442 | ||
3638733b | 1443 | /* If this is a libcall, then precompute all arguments so that we do not |
82c82743 | 1444 | get extraneous instructions emitted as part of the libcall sequence. */ |
6a4e56a9 JJ |
1445 | |
1446 | /* If we preallocated the stack space, and some arguments must be passed | |
1447 | on the stack, then we must precompute any parameter which contains a | |
1448 | function call which will store arguments on the stack. | |
1449 | Otherwise, evaluating the parameter may clobber previous parameters | |
1450 | which have already been stored into the stack. (we have code to avoid | |
1451 | such case by saving the outgoing stack arguments, but it results in | |
1452 | worse code) */ | |
84b8030f | 1453 | if (!ACCUMULATE_OUTGOING_ARGS) |
82c82743 | 1454 | return; |
7ae4ad28 | 1455 | |
cc0b1adc | 1456 | for (i = 0; i < num_actuals; i++) |
82c82743 | 1457 | { |
cde0f3fd | 1458 | tree type; |
82c82743 | 1459 | enum machine_mode mode; |
ddef6bc7 | 1460 | |
84b8030f | 1461 | if (TREE_CODE (args[i].tree_value) != CALL_EXPR) |
6a4e56a9 JJ |
1462 | continue; |
1463 | ||
82c82743 | 1464 | /* If this is an addressable type, we cannot pre-evaluate it. */ |
cde0f3fd PB |
1465 | type = TREE_TYPE (args[i].tree_value); |
1466 | gcc_assert (!TREE_ADDRESSABLE (type)); | |
cc0b1adc | 1467 | |
82c82743 | 1468 | args[i].initial_value = args[i].value |
84217346 | 1469 | = expand_normal (args[i].tree_value); |
cc0b1adc | 1470 | |
cde0f3fd | 1471 | mode = TYPE_MODE (type); |
82c82743 RH |
1472 | if (mode != args[i].mode) |
1473 | { | |
cde0f3fd | 1474 | int unsignedp = args[i].unsignedp; |
82c82743 RH |
1475 | args[i].value |
1476 | = convert_modes (args[i].mode, mode, | |
1477 | args[i].value, args[i].unsignedp); | |
cde0f3fd | 1478 | |
82c82743 RH |
1479 | /* CSE will replace this only if it contains args[i].value |
1480 | pseudo, so convert it down to the declared mode using | |
1481 | a SUBREG. */ | |
1482 | if (REG_P (args[i].value) | |
cde0f3fd PB |
1483 | && GET_MODE_CLASS (args[i].mode) == MODE_INT |
1484 | && promote_mode (type, mode, &unsignedp) != args[i].mode) | |
82c82743 RH |
1485 | { |
1486 | args[i].initial_value | |
1487 | = gen_lowpart_SUBREG (mode, args[i].value); | |
1488 | SUBREG_PROMOTED_VAR_P (args[i].initial_value) = 1; | |
27be0c32 | 1489 | SUBREG_PROMOTED_SET (args[i].initial_value, args[i].unsignedp); |
82c82743 | 1490 | } |
82c82743 RH |
1491 | } |
1492 | } | |
cc0b1adc JL |
1493 | } |
1494 | ||
0f9b3ea6 JL |
1495 | /* Given the current state of MUST_PREALLOCATE and information about |
1496 | arguments to a function call in NUM_ACTUALS, ARGS and ARGS_SIZE, | |
1497 | compute and return the final value for MUST_PREALLOCATE. */ | |
1498 | ||
1499 | static int | |
b8698a0f | 1500 | finalize_must_preallocate (int must_preallocate, int num_actuals, |
5039610b | 1501 | struct arg_data *args, struct args_size *args_size) |
0f9b3ea6 JL |
1502 | { |
1503 | /* See if we have or want to preallocate stack space. | |
1504 | ||
1505 | If we would have to push a partially-in-regs parm | |
1506 | before other stack parms, preallocate stack space instead. | |
1507 | ||
1508 | If the size of some parm is not a multiple of the required stack | |
1509 | alignment, we must preallocate. | |
1510 | ||
1511 | If the total size of arguments that would otherwise create a copy in | |
1512 | a temporary (such as a CALL) is more than half the total argument list | |
1513 | size, preallocation is faster. | |
1514 | ||
1515 | Another reason to preallocate is if we have a machine (like the m88k) | |
1516 | where stack alignment is required to be maintained between every | |
1517 | pair of insns, not just when the call is made. However, we assume here | |
1518 | that such machines either do not have push insns (and hence preallocation | |
1519 | would occur anyway) or the problem is taken care of with | |
1520 | PUSH_ROUNDING. */ | |
1521 | ||
1522 | if (! must_preallocate) | |
1523 | { | |
1524 | int partial_seen = 0; | |
1525 | int copy_to_evaluate_size = 0; | |
1526 | int i; | |
1527 | ||
1528 | for (i = 0; i < num_actuals && ! must_preallocate; i++) | |
1529 | { | |
1530 | if (args[i].partial > 0 && ! args[i].pass_on_stack) | |
1531 | partial_seen = 1; | |
1532 | else if (partial_seen && args[i].reg == 0) | |
1533 | must_preallocate = 1; | |
1534 | ||
1535 | if (TYPE_MODE (TREE_TYPE (args[i].tree_value)) == BLKmode | |
1536 | && (TREE_CODE (args[i].tree_value) == CALL_EXPR | |
1537 | || TREE_CODE (args[i].tree_value) == TARGET_EXPR | |
1538 | || TREE_CODE (args[i].tree_value) == COND_EXPR | |
1539 | || TREE_ADDRESSABLE (TREE_TYPE (args[i].tree_value)))) | |
1540 | copy_to_evaluate_size | |
1541 | += int_size_in_bytes (TREE_TYPE (args[i].tree_value)); | |
1542 | } | |
1543 | ||
1544 | if (copy_to_evaluate_size * 2 >= args_size->constant | |
1545 | && args_size->constant > 0) | |
1546 | must_preallocate = 1; | |
1547 | } | |
1548 | return must_preallocate; | |
1549 | } | |
599f37b6 | 1550 | |
a45bdd02 JL |
1551 | /* If we preallocated stack space, compute the address of each argument |
1552 | and store it into the ARGS array. | |
1553 | ||
f725a3ec | 1554 | We need not ensure it is a valid memory address here; it will be |
a45bdd02 JL |
1555 | validized when it is used. |
1556 | ||
1557 | ARGBLOCK is an rtx for the address of the outgoing arguments. */ | |
1558 | ||
1559 | static void | |
d329e058 | 1560 | compute_argument_addresses (struct arg_data *args, rtx argblock, int num_actuals) |
a45bdd02 JL |
1561 | { |
1562 | if (argblock) | |
1563 | { | |
1564 | rtx arg_reg = argblock; | |
1565 | int i, arg_offset = 0; | |
1566 | ||
1567 | if (GET_CODE (argblock) == PLUS) | |
1568 | arg_reg = XEXP (argblock, 0), arg_offset = INTVAL (XEXP (argblock, 1)); | |
1569 | ||
1570 | for (i = 0; i < num_actuals; i++) | |
1571 | { | |
e7949876 AM |
1572 | rtx offset = ARGS_SIZE_RTX (args[i].locate.offset); |
1573 | rtx slot_offset = ARGS_SIZE_RTX (args[i].locate.slot_offset); | |
a45bdd02 | 1574 | rtx addr; |
bfc45551 | 1575 | unsigned int align, boundary; |
7816b87e JC |
1576 | unsigned int units_on_stack = 0; |
1577 | enum machine_mode partial_mode = VOIDmode; | |
a45bdd02 JL |
1578 | |
1579 | /* Skip this parm if it will not be passed on the stack. */ | |
7816b87e JC |
1580 | if (! args[i].pass_on_stack |
1581 | && args[i].reg != 0 | |
1582 | && args[i].partial == 0) | |
a45bdd02 JL |
1583 | continue; |
1584 | ||
481683e1 | 1585 | if (CONST_INT_P (offset)) |
0a81f074 | 1586 | addr = plus_constant (Pmode, arg_reg, INTVAL (offset)); |
a45bdd02 JL |
1587 | else |
1588 | addr = gen_rtx_PLUS (Pmode, arg_reg, offset); | |
1589 | ||
0a81f074 | 1590 | addr = plus_constant (Pmode, addr, arg_offset); |
7816b87e JC |
1591 | |
1592 | if (args[i].partial != 0) | |
1593 | { | |
1594 | /* Only part of the parameter is being passed on the stack. | |
1595 | Generate a simple memory reference of the correct size. */ | |
1596 | units_on_stack = args[i].locate.size.constant; | |
1597 | partial_mode = mode_for_size (units_on_stack * BITS_PER_UNIT, | |
1598 | MODE_INT, 1); | |
1599 | args[i].stack = gen_rtx_MEM (partial_mode, addr); | |
f5541398 | 1600 | set_mem_size (args[i].stack, units_on_stack); |
7816b87e JC |
1601 | } |
1602 | else | |
1603 | { | |
1604 | args[i].stack = gen_rtx_MEM (args[i].mode, addr); | |
1605 | set_mem_attributes (args[i].stack, | |
1606 | TREE_TYPE (args[i].tree_value), 1); | |
1607 | } | |
bfc45551 AM |
1608 | align = BITS_PER_UNIT; |
1609 | boundary = args[i].locate.boundary; | |
1610 | if (args[i].locate.where_pad != downward) | |
1611 | align = boundary; | |
481683e1 | 1612 | else if (CONST_INT_P (offset)) |
bfc45551 AM |
1613 | { |
1614 | align = INTVAL (offset) * BITS_PER_UNIT | boundary; | |
1615 | align = align & -align; | |
1616 | } | |
1617 | set_mem_align (args[i].stack, align); | |
a45bdd02 | 1618 | |
481683e1 | 1619 | if (CONST_INT_P (slot_offset)) |
0a81f074 | 1620 | addr = plus_constant (Pmode, arg_reg, INTVAL (slot_offset)); |
a45bdd02 JL |
1621 | else |
1622 | addr = gen_rtx_PLUS (Pmode, arg_reg, slot_offset); | |
1623 | ||
0a81f074 | 1624 | addr = plus_constant (Pmode, addr, arg_offset); |
7816b87e JC |
1625 | |
1626 | if (args[i].partial != 0) | |
1627 | { | |
1628 | /* Only part of the parameter is being passed on the stack. | |
1629 | Generate a simple memory reference of the correct size. | |
1630 | */ | |
1631 | args[i].stack_slot = gen_rtx_MEM (partial_mode, addr); | |
f5541398 | 1632 | set_mem_size (args[i].stack_slot, units_on_stack); |
7816b87e JC |
1633 | } |
1634 | else | |
1635 | { | |
1636 | args[i].stack_slot = gen_rtx_MEM (args[i].mode, addr); | |
1637 | set_mem_attributes (args[i].stack_slot, | |
1638 | TREE_TYPE (args[i].tree_value), 1); | |
1639 | } | |
bfc45551 | 1640 | set_mem_align (args[i].stack_slot, args[i].locate.boundary); |
7ab923cc JJ |
1641 | |
1642 | /* Function incoming arguments may overlap with sibling call | |
1643 | outgoing arguments and we cannot allow reordering of reads | |
1644 | from function arguments with stores to outgoing arguments | |
1645 | of sibling calls. */ | |
ba4828e0 RK |
1646 | set_mem_alias_set (args[i].stack, 0); |
1647 | set_mem_alias_set (args[i].stack_slot, 0); | |
a45bdd02 JL |
1648 | } |
1649 | } | |
1650 | } | |
f725a3ec | 1651 | |
a45bdd02 JL |
1652 | /* Given a FNDECL and EXP, return an rtx suitable for use as a target address |
1653 | in a call instruction. | |
1654 | ||
1655 | FNDECL is the tree node for the target function. For an indirect call | |
1656 | FNDECL will be NULL_TREE. | |
1657 | ||
09e2bf48 | 1658 | ADDR is the operand 0 of CALL_EXPR for this call. */ |
a45bdd02 JL |
1659 | |
1660 | static rtx | |
d329e058 | 1661 | rtx_for_function_call (tree fndecl, tree addr) |
a45bdd02 JL |
1662 | { |
1663 | rtx funexp; | |
1664 | ||
1665 | /* Get the function to call, in the form of RTL. */ | |
1666 | if (fndecl) | |
1667 | { | |
ad960f56 | 1668 | if (!TREE_USED (fndecl) && fndecl != current_function_decl) |
bbee5843 | 1669 | TREE_USED (fndecl) = 1; |
a45bdd02 JL |
1670 | |
1671 | /* Get a SYMBOL_REF rtx for the function address. */ | |
1672 | funexp = XEXP (DECL_RTL (fndecl), 0); | |
1673 | } | |
1674 | else | |
1675 | /* Generate an rtx (probably a pseudo-register) for the address. */ | |
1676 | { | |
1677 | push_temp_slots (); | |
84217346 | 1678 | funexp = expand_normal (addr); |
f725a3ec | 1679 | pop_temp_slots (); /* FUNEXP can't be BLKmode. */ |
a45bdd02 JL |
1680 | } |
1681 | return funexp; | |
1682 | } | |
1683 | ||
5275901c JJ |
1684 | /* Internal state for internal_arg_pointer_based_exp and its helpers. */ |
1685 | static struct | |
1686 | { | |
1687 | /* Last insn that has been scanned by internal_arg_pointer_based_exp_scan, | |
1688 | or NULL_RTX if none has been scanned yet. */ | |
48810515 | 1689 | rtx_insn *scan_start; |
5275901c JJ |
1690 | /* Vector indexed by REGNO - FIRST_PSEUDO_REGISTER, recording if a pseudo is |
1691 | based on crtl->args.internal_arg_pointer. The element is NULL_RTX if the | |
1692 | pseudo isn't based on it, a CONST_INT offset if the pseudo is based on it | |
1693 | with fixed offset, or PC if this is with variable or unknown offset. */ | |
9771b263 | 1694 | vec<rtx> cache; |
5275901c JJ |
1695 | } internal_arg_pointer_exp_state; |
1696 | ||
e9f56944 | 1697 | static rtx internal_arg_pointer_based_exp (const_rtx, bool); |
5275901c JJ |
1698 | |
1699 | /* Helper function for internal_arg_pointer_based_exp. Scan insns in | |
1700 | the tail call sequence, starting with first insn that hasn't been | |
1701 | scanned yet, and note for each pseudo on the LHS whether it is based | |
1702 | on crtl->args.internal_arg_pointer or not, and what offset from that | |
1703 | that pointer it has. */ | |
1704 | ||
1705 | static void | |
1706 | internal_arg_pointer_based_exp_scan (void) | |
1707 | { | |
48810515 | 1708 | rtx_insn *insn, *scan_start = internal_arg_pointer_exp_state.scan_start; |
5275901c JJ |
1709 | |
1710 | if (scan_start == NULL_RTX) | |
1711 | insn = get_insns (); | |
1712 | else | |
1713 | insn = NEXT_INSN (scan_start); | |
1714 | ||
1715 | while (insn) | |
1716 | { | |
1717 | rtx set = single_set (insn); | |
1718 | if (set && REG_P (SET_DEST (set)) && !HARD_REGISTER_P (SET_DEST (set))) | |
1719 | { | |
1720 | rtx val = NULL_RTX; | |
1721 | unsigned int idx = REGNO (SET_DEST (set)) - FIRST_PSEUDO_REGISTER; | |
1722 | /* Punt on pseudos set multiple times. */ | |
9771b263 DN |
1723 | if (idx < internal_arg_pointer_exp_state.cache.length () |
1724 | && (internal_arg_pointer_exp_state.cache[idx] | |
5275901c JJ |
1725 | != NULL_RTX)) |
1726 | val = pc_rtx; | |
1727 | else | |
1728 | val = internal_arg_pointer_based_exp (SET_SRC (set), false); | |
1729 | if (val != NULL_RTX) | |
1730 | { | |
9771b263 | 1731 | if (idx >= internal_arg_pointer_exp_state.cache.length ()) |
c3284718 RS |
1732 | internal_arg_pointer_exp_state.cache |
1733 | .safe_grow_cleared (idx + 1); | |
9771b263 | 1734 | internal_arg_pointer_exp_state.cache[idx] = val; |
5275901c JJ |
1735 | } |
1736 | } | |
1737 | if (NEXT_INSN (insn) == NULL_RTX) | |
1738 | scan_start = insn; | |
1739 | insn = NEXT_INSN (insn); | |
1740 | } | |
1741 | ||
1742 | internal_arg_pointer_exp_state.scan_start = scan_start; | |
1743 | } | |
1744 | ||
5275901c JJ |
1745 | /* Compute whether RTL is based on crtl->args.internal_arg_pointer. Return |
1746 | NULL_RTX if RTL isn't based on it, a CONST_INT offset if RTL is based on | |
1747 | it with fixed offset, or PC if this is with variable or unknown offset. | |
1748 | TOPLEVEL is true if the function is invoked at the topmost level. */ | |
1749 | ||
1750 | static rtx | |
e9f56944 | 1751 | internal_arg_pointer_based_exp (const_rtx rtl, bool toplevel) |
5275901c JJ |
1752 | { |
1753 | if (CONSTANT_P (rtl)) | |
1754 | return NULL_RTX; | |
1755 | ||
1756 | if (rtl == crtl->args.internal_arg_pointer) | |
1757 | return const0_rtx; | |
1758 | ||
1759 | if (REG_P (rtl) && HARD_REGISTER_P (rtl)) | |
1760 | return NULL_RTX; | |
1761 | ||
1762 | if (GET_CODE (rtl) == PLUS && CONST_INT_P (XEXP (rtl, 1))) | |
1763 | { | |
1764 | rtx val = internal_arg_pointer_based_exp (XEXP (rtl, 0), toplevel); | |
1765 | if (val == NULL_RTX || val == pc_rtx) | |
1766 | return val; | |
0a81f074 | 1767 | return plus_constant (Pmode, val, INTVAL (XEXP (rtl, 1))); |
5275901c JJ |
1768 | } |
1769 | ||
1770 | /* When called at the topmost level, scan pseudo assignments in between the | |
1771 | last scanned instruction in the tail call sequence and the latest insn | |
1772 | in that sequence. */ | |
1773 | if (toplevel) | |
1774 | internal_arg_pointer_based_exp_scan (); | |
1775 | ||
1776 | if (REG_P (rtl)) | |
1777 | { | |
1778 | unsigned int idx = REGNO (rtl) - FIRST_PSEUDO_REGISTER; | |
9771b263 DN |
1779 | if (idx < internal_arg_pointer_exp_state.cache.length ()) |
1780 | return internal_arg_pointer_exp_state.cache[idx]; | |
5275901c JJ |
1781 | |
1782 | return NULL_RTX; | |
1783 | } | |
1784 | ||
e9f56944 RS |
1785 | subrtx_iterator::array_type array; |
1786 | FOR_EACH_SUBRTX (iter, array, rtl, NONCONST) | |
1787 | { | |
1788 | const_rtx x = *iter; | |
1789 | if (REG_P (x) && internal_arg_pointer_based_exp (x, false) != NULL_RTX) | |
1790 | return pc_rtx; | |
1791 | if (MEM_P (x)) | |
1792 | iter.skip_subrtxes (); | |
1793 | } | |
5275901c JJ |
1794 | |
1795 | return NULL_RTX; | |
1796 | } | |
1797 | ||
07eef816 KH |
1798 | /* Return true if and only if SIZE storage units (usually bytes) |
1799 | starting from address ADDR overlap with already clobbered argument | |
1800 | area. This function is used to determine if we should give up a | |
1801 | sibcall. */ | |
1802 | ||
1803 | static bool | |
1804 | mem_overlaps_already_clobbered_arg_p (rtx addr, unsigned HOST_WIDE_INT size) | |
1805 | { | |
1806 | HOST_WIDE_INT i; | |
5275901c | 1807 | rtx val; |
07eef816 | 1808 | |
f61e445a | 1809 | if (bitmap_empty_p (stored_args_map)) |
4189fb53 | 1810 | return false; |
5275901c JJ |
1811 | val = internal_arg_pointer_based_exp (addr, true); |
1812 | if (val == NULL_RTX) | |
1813 | return false; | |
1814 | else if (val == pc_rtx) | |
6c3cb698 | 1815 | return true; |
07eef816 | 1816 | else |
5275901c | 1817 | i = INTVAL (val); |
2c8b5d61 JJ |
1818 | #ifdef STACK_GROWS_DOWNWARD |
1819 | i -= crtl->args.pretend_args_size; | |
1820 | #else | |
1821 | i += crtl->args.pretend_args_size; | |
1822 | #endif | |
07eef816 KH |
1823 | |
1824 | #ifdef ARGS_GROW_DOWNWARD | |
1825 | i = -i - size; | |
1826 | #endif | |
1827 | if (size > 0) | |
1828 | { | |
1829 | unsigned HOST_WIDE_INT k; | |
1830 | ||
1831 | for (k = 0; k < size; k++) | |
5829cc0f | 1832 | if (i + k < SBITMAP_SIZE (stored_args_map) |
d7c028c0 | 1833 | && bitmap_bit_p (stored_args_map, i + k)) |
07eef816 KH |
1834 | return true; |
1835 | } | |
1836 | ||
1837 | return false; | |
1838 | } | |
1839 | ||
21a3b983 JL |
1840 | /* Do the register loads required for any wholly-register parms or any |
1841 | parms which are passed both on the stack and in a register. Their | |
f725a3ec | 1842 | expressions were already evaluated. |
21a3b983 JL |
1843 | |
1844 | Mark all register-parms as living through the call, putting these USE | |
d329e058 AJ |
1845 | insns in the CALL_INSN_FUNCTION_USAGE field. |
1846 | ||
40b0345d | 1847 | When IS_SIBCALL, perform the check_sibcall_argument_overlap |
0cdca92b | 1848 | checking, setting *SIBCALL_FAILURE if appropriate. */ |
21a3b983 JL |
1849 | |
1850 | static void | |
d329e058 AJ |
1851 | load_register_parameters (struct arg_data *args, int num_actuals, |
1852 | rtx *call_fusage, int flags, int is_sibcall, | |
1853 | int *sibcall_failure) | |
21a3b983 JL |
1854 | { |
1855 | int i, j; | |
1856 | ||
21a3b983 | 1857 | for (i = 0; i < num_actuals; i++) |
21a3b983 | 1858 | { |
099e9712 JH |
1859 | rtx reg = ((flags & ECF_SIBCALL) |
1860 | ? args[i].tail_call_reg : args[i].reg); | |
21a3b983 JL |
1861 | if (reg) |
1862 | { | |
6e985040 AM |
1863 | int partial = args[i].partial; |
1864 | int nregs; | |
1865 | int size = 0; | |
48810515 | 1866 | rtx_insn *before_arg = get_last_insn (); |
f0078f86 AM |
1867 | /* Set non-negative if we must move a word at a time, even if |
1868 | just one word (e.g, partial == 4 && mode == DFmode). Set | |
1869 | to -1 if we just use a normal move insn. This value can be | |
1870 | zero if the argument is a zero size structure. */ | |
6e985040 | 1871 | nregs = -1; |
78a52f11 RH |
1872 | if (GET_CODE (reg) == PARALLEL) |
1873 | ; | |
1874 | else if (partial) | |
1875 | { | |
1876 | gcc_assert (partial % UNITS_PER_WORD == 0); | |
1877 | nregs = partial / UNITS_PER_WORD; | |
1878 | } | |
6e985040 AM |
1879 | else if (TYPE_MODE (TREE_TYPE (args[i].tree_value)) == BLKmode) |
1880 | { | |
1881 | size = int_size_in_bytes (TREE_TYPE (args[i].tree_value)); | |
1882 | nregs = (size + (UNITS_PER_WORD - 1)) / UNITS_PER_WORD; | |
1883 | } | |
1884 | else | |
1885 | size = GET_MODE_SIZE (args[i].mode); | |
21a3b983 JL |
1886 | |
1887 | /* Handle calls that pass values in multiple non-contiguous | |
1888 | locations. The Irix 6 ABI has examples of this. */ | |
1889 | ||
1890 | if (GET_CODE (reg) == PARALLEL) | |
8df3dbb7 | 1891 | emit_group_move (reg, args[i].parallel_value); |
21a3b983 JL |
1892 | |
1893 | /* If simple case, just do move. If normal partial, store_one_arg | |
1894 | has already loaded the register for us. In all other cases, | |
1895 | load the register(s) from memory. */ | |
1896 | ||
9206d736 AM |
1897 | else if (nregs == -1) |
1898 | { | |
1899 | emit_move_insn (reg, args[i].value); | |
6e985040 | 1900 | #ifdef BLOCK_REG_PADDING |
9206d736 AM |
1901 | /* Handle case where we have a value that needs shifting |
1902 | up to the msb. eg. a QImode value and we're padding | |
1903 | upward on a BYTES_BIG_ENDIAN machine. */ | |
1904 | if (size < UNITS_PER_WORD | |
1905 | && (args[i].locate.where_pad | |
1906 | == (BYTES_BIG_ENDIAN ? upward : downward))) | |
1907 | { | |
9206d736 AM |
1908 | rtx x; |
1909 | int shift = (UNITS_PER_WORD - size) * BITS_PER_UNIT; | |
980f6e8e AM |
1910 | |
1911 | /* Assigning REG here rather than a temp makes CALL_FUSAGE | |
1912 | report the whole reg as used. Strictly speaking, the | |
1913 | call only uses SIZE bytes at the msb end, but it doesn't | |
1914 | seem worth generating rtl to say that. */ | |
1915 | reg = gen_rtx_REG (word_mode, REGNO (reg)); | |
eb6c3df1 | 1916 | x = expand_shift (LSHIFT_EXPR, word_mode, reg, shift, reg, 1); |
980f6e8e AM |
1917 | if (x != reg) |
1918 | emit_move_insn (reg, x); | |
9206d736 | 1919 | } |
6e985040 | 1920 | #endif |
9206d736 | 1921 | } |
21a3b983 JL |
1922 | |
1923 | /* If we have pre-computed the values to put in the registers in | |
1924 | the case of non-aligned structures, copy them in now. */ | |
1925 | ||
1926 | else if (args[i].n_aligned_regs != 0) | |
1927 | for (j = 0; j < args[i].n_aligned_regs; j++) | |
1928 | emit_move_insn (gen_rtx_REG (word_mode, REGNO (reg) + j), | |
1929 | args[i].aligned_regs[j]); | |
1930 | ||
3b2ee170 | 1931 | else if (partial == 0 || args[i].pass_on_stack) |
6e985040 | 1932 | { |
1a8cb155 | 1933 | rtx mem = validize_mem (copy_rtx (args[i].value)); |
6e985040 | 1934 | |
3b2ee170 IS |
1935 | /* Check for overlap with already clobbered argument area, |
1936 | providing that this has non-zero size. */ | |
07eef816 | 1937 | if (is_sibcall |
3b2ee170 IS |
1938 | && (size == 0 |
1939 | || mem_overlaps_already_clobbered_arg_p | |
1940 | (XEXP (args[i].value, 0), size))) | |
07eef816 KH |
1941 | *sibcall_failure = 1; |
1942 | ||
6e985040 | 1943 | /* Handle a BLKmode that needs shifting. */ |
9206d736 | 1944 | if (nregs == 1 && size < UNITS_PER_WORD |
03ca1672 UW |
1945 | #ifdef BLOCK_REG_PADDING |
1946 | && args[i].locate.where_pad == downward | |
1947 | #else | |
1948 | && BYTES_BIG_ENDIAN | |
1949 | #endif | |
1950 | ) | |
6e985040 AM |
1951 | { |
1952 | rtx tem = operand_subword_force (mem, 0, args[i].mode); | |
1953 | rtx ri = gen_rtx_REG (word_mode, REGNO (reg)); | |
1954 | rtx x = gen_reg_rtx (word_mode); | |
1955 | int shift = (UNITS_PER_WORD - size) * BITS_PER_UNIT; | |
09b52670 RS |
1956 | enum tree_code dir = BYTES_BIG_ENDIAN ? RSHIFT_EXPR |
1957 | : LSHIFT_EXPR; | |
6e985040 AM |
1958 | |
1959 | emit_move_insn (x, tem); | |
eb6c3df1 | 1960 | x = expand_shift (dir, word_mode, x, shift, ri, 1); |
6e985040 AM |
1961 | if (x != ri) |
1962 | emit_move_insn (ri, x); | |
1963 | } | |
1964 | else | |
6e985040 AM |
1965 | move_block_to_reg (REGNO (reg), mem, nregs, args[i].mode); |
1966 | } | |
21a3b983 | 1967 | |
0cdca92b DJ |
1968 | /* When a parameter is a block, and perhaps in other cases, it is |
1969 | possible that it did a load from an argument slot that was | |
32dd366d | 1970 | already clobbered. */ |
0cdca92b DJ |
1971 | if (is_sibcall |
1972 | && check_sibcall_argument_overlap (before_arg, &args[i], 0)) | |
1973 | *sibcall_failure = 1; | |
1974 | ||
21a3b983 JL |
1975 | /* Handle calls that pass values in multiple non-contiguous |
1976 | locations. The Irix 6 ABI has examples of this. */ | |
1977 | if (GET_CODE (reg) == PARALLEL) | |
1978 | use_group_regs (call_fusage, reg); | |
1979 | else if (nregs == -1) | |
7d810276 JJ |
1980 | use_reg_mode (call_fusage, reg, |
1981 | TYPE_MODE (TREE_TYPE (args[i].tree_value))); | |
faa00334 AO |
1982 | else if (nregs > 0) |
1983 | use_regs (call_fusage, REGNO (reg), nregs); | |
21a3b983 JL |
1984 | } |
1985 | } | |
1986 | } | |
1987 | ||
739fb049 MM |
1988 | /* We need to pop PENDING_STACK_ADJUST bytes. But, if the arguments |
1989 | wouldn't fill up an even multiple of PREFERRED_UNIT_STACK_BOUNDARY | |
1990 | bytes, then we would need to push some additional bytes to pad the | |
ce48579b RH |
1991 | arguments. So, we compute an adjust to the stack pointer for an |
1992 | amount that will leave the stack under-aligned by UNADJUSTED_ARGS_SIZE | |
1993 | bytes. Then, when the arguments are pushed the stack will be perfectly | |
1994 | aligned. ARGS_SIZE->CONSTANT is set to the number of bytes that should | |
1995 | be popped after the call. Returns the adjustment. */ | |
739fb049 | 1996 | |
ce48579b | 1997 | static int |
d329e058 AJ |
1998 | combine_pending_stack_adjustment_and_call (int unadjusted_args_size, |
1999 | struct args_size *args_size, | |
95899b34 | 2000 | unsigned int preferred_unit_stack_boundary) |
739fb049 MM |
2001 | { |
2002 | /* The number of bytes to pop so that the stack will be | |
2003 | under-aligned by UNADJUSTED_ARGS_SIZE bytes. */ | |
2004 | HOST_WIDE_INT adjustment; | |
2005 | /* The alignment of the stack after the arguments are pushed, if we | |
2006 | just pushed the arguments without adjust the stack here. */ | |
95899b34 | 2007 | unsigned HOST_WIDE_INT unadjusted_alignment; |
739fb049 | 2008 | |
f725a3ec | 2009 | unadjusted_alignment |
739fb049 MM |
2010 | = ((stack_pointer_delta + unadjusted_args_size) |
2011 | % preferred_unit_stack_boundary); | |
2012 | ||
2013 | /* We want to get rid of as many of the PENDING_STACK_ADJUST bytes | |
2014 | as possible -- leaving just enough left to cancel out the | |
2015 | UNADJUSTED_ALIGNMENT. In other words, we want to ensure that the | |
2016 | PENDING_STACK_ADJUST is non-negative, and congruent to | |
2017 | -UNADJUSTED_ALIGNMENT modulo the PREFERRED_UNIT_STACK_BOUNDARY. */ | |
2018 | ||
2019 | /* Begin by trying to pop all the bytes. */ | |
f725a3ec KH |
2020 | unadjusted_alignment |
2021 | = (unadjusted_alignment | |
739fb049 MM |
2022 | - (pending_stack_adjust % preferred_unit_stack_boundary)); |
2023 | adjustment = pending_stack_adjust; | |
2024 | /* Push enough additional bytes that the stack will be aligned | |
2025 | after the arguments are pushed. */ | |
e079dcdb HB |
2026 | if (preferred_unit_stack_boundary > 1) |
2027 | { | |
3e555c7d | 2028 | if (unadjusted_alignment > 0) |
f725a3ec | 2029 | adjustment -= preferred_unit_stack_boundary - unadjusted_alignment; |
e079dcdb | 2030 | else |
f725a3ec | 2031 | adjustment += unadjusted_alignment; |
e079dcdb | 2032 | } |
f725a3ec | 2033 | |
739fb049 MM |
2034 | /* Now, sets ARGS_SIZE->CONSTANT so that we pop the right number of |
2035 | bytes after the call. The right number is the entire | |
2036 | PENDING_STACK_ADJUST less our ADJUSTMENT plus the amount required | |
2037 | by the arguments in the first place. */ | |
f725a3ec | 2038 | args_size->constant |
739fb049 MM |
2039 | = pending_stack_adjust - adjustment + unadjusted_args_size; |
2040 | ||
ce48579b | 2041 | return adjustment; |
739fb049 MM |
2042 | } |
2043 | ||
c67846f2 JJ |
2044 | /* Scan X expression if it does not dereference any argument slots |
2045 | we already clobbered by tail call arguments (as noted in stored_args_map | |
2046 | bitmap). | |
da7d8304 | 2047 | Return nonzero if X expression dereferences such argument slots, |
c67846f2 JJ |
2048 | zero otherwise. */ |
2049 | ||
2050 | static int | |
d329e058 | 2051 | check_sibcall_argument_overlap_1 (rtx x) |
c67846f2 JJ |
2052 | { |
2053 | RTX_CODE code; | |
2054 | int i, j; | |
c67846f2 JJ |
2055 | const char *fmt; |
2056 | ||
2057 | if (x == NULL_RTX) | |
2058 | return 0; | |
2059 | ||
2060 | code = GET_CODE (x); | |
2061 | ||
6c3cb698 KY |
2062 | /* We need not check the operands of the CALL expression itself. */ |
2063 | if (code == CALL) | |
2064 | return 0; | |
2065 | ||
c67846f2 | 2066 | if (code == MEM) |
07eef816 KH |
2067 | return mem_overlaps_already_clobbered_arg_p (XEXP (x, 0), |
2068 | GET_MODE_SIZE (GET_MODE (x))); | |
c67846f2 | 2069 | |
f725a3ec | 2070 | /* Scan all subexpressions. */ |
c67846f2 JJ |
2071 | fmt = GET_RTX_FORMAT (code); |
2072 | for (i = 0; i < GET_RTX_LENGTH (code); i++, fmt++) | |
2073 | { | |
2074 | if (*fmt == 'e') | |
f725a3ec KH |
2075 | { |
2076 | if (check_sibcall_argument_overlap_1 (XEXP (x, i))) | |
2077 | return 1; | |
2078 | } | |
c67846f2 | 2079 | else if (*fmt == 'E') |
f725a3ec KH |
2080 | { |
2081 | for (j = 0; j < XVECLEN (x, i); j++) | |
2082 | if (check_sibcall_argument_overlap_1 (XVECEXP (x, i, j))) | |
2083 | return 1; | |
2084 | } | |
c67846f2 JJ |
2085 | } |
2086 | return 0; | |
c67846f2 JJ |
2087 | } |
2088 | ||
2089 | /* Scan sequence after INSN if it does not dereference any argument slots | |
2090 | we already clobbered by tail call arguments (as noted in stored_args_map | |
0cdca92b DJ |
2091 | bitmap). If MARK_STORED_ARGS_MAP, add stack slots for ARG to |
2092 | stored_args_map bitmap afterwards (when ARG is a register MARK_STORED_ARGS_MAP | |
2093 | should be 0). Return nonzero if sequence after INSN dereferences such argument | |
2094 | slots, zero otherwise. */ | |
c67846f2 JJ |
2095 | |
2096 | static int | |
48810515 DM |
2097 | check_sibcall_argument_overlap (rtx_insn *insn, struct arg_data *arg, |
2098 | int mark_stored_args_map) | |
f725a3ec | 2099 | { |
c67846f2 JJ |
2100 | int low, high; |
2101 | ||
2102 | if (insn == NULL_RTX) | |
2103 | insn = get_insns (); | |
2104 | else | |
2105 | insn = NEXT_INSN (insn); | |
2106 | ||
2107 | for (; insn; insn = NEXT_INSN (insn)) | |
f725a3ec KH |
2108 | if (INSN_P (insn) |
2109 | && check_sibcall_argument_overlap_1 (PATTERN (insn))) | |
c67846f2 JJ |
2110 | break; |
2111 | ||
0cdca92b DJ |
2112 | if (mark_stored_args_map) |
2113 | { | |
d60eab50 | 2114 | #ifdef ARGS_GROW_DOWNWARD |
e7949876 | 2115 | low = -arg->locate.slot_offset.constant - arg->locate.size.constant; |
d60eab50 | 2116 | #else |
e7949876 | 2117 | low = arg->locate.slot_offset.constant; |
d60eab50 AO |
2118 | #endif |
2119 | ||
e7949876 | 2120 | for (high = low + arg->locate.size.constant; low < high; low++) |
d7c028c0 | 2121 | bitmap_set_bit (stored_args_map, low); |
0cdca92b | 2122 | } |
c67846f2 JJ |
2123 | return insn != NULL_RTX; |
2124 | } | |
2125 | ||
bef5d8b6 RS |
2126 | /* Given that a function returns a value of mode MODE at the most |
2127 | significant end of hard register VALUE, shift VALUE left or right | |
2128 | as specified by LEFT_P. Return true if some action was needed. */ | |
c988af2b | 2129 | |
bef5d8b6 RS |
2130 | bool |
2131 | shift_return_value (enum machine_mode mode, bool left_p, rtx value) | |
c988af2b | 2132 | { |
bef5d8b6 RS |
2133 | HOST_WIDE_INT shift; |
2134 | ||
2135 | gcc_assert (REG_P (value) && HARD_REGISTER_P (value)); | |
2136 | shift = GET_MODE_BITSIZE (GET_MODE (value)) - GET_MODE_BITSIZE (mode); | |
2137 | if (shift == 0) | |
2138 | return false; | |
2139 | ||
2140 | /* Use ashr rather than lshr for right shifts. This is for the benefit | |
2141 | of the MIPS port, which requires SImode values to be sign-extended | |
2142 | when stored in 64-bit registers. */ | |
2143 | if (!force_expand_binop (GET_MODE (value), left_p ? ashl_optab : ashr_optab, | |
2144 | value, GEN_INT (shift), value, 1, OPTAB_WIDEN)) | |
2145 | gcc_unreachable (); | |
2146 | return true; | |
c988af2b RS |
2147 | } |
2148 | ||
3fb30019 RS |
2149 | /* If X is a likely-spilled register value, copy it to a pseudo |
2150 | register and return that register. Return X otherwise. */ | |
2151 | ||
2152 | static rtx | |
2153 | avoid_likely_spilled_reg (rtx x) | |
2154 | { | |
82d6e6fc | 2155 | rtx new_rtx; |
3fb30019 RS |
2156 | |
2157 | if (REG_P (x) | |
2158 | && HARD_REGISTER_P (x) | |
07b8f0a8 | 2159 | && targetm.class_likely_spilled_p (REGNO_REG_CLASS (REGNO (x)))) |
3fb30019 RS |
2160 | { |
2161 | /* Make sure that we generate a REG rather than a CONCAT. | |
2162 | Moves into CONCATs can need nontrivial instructions, | |
2163 | and the whole point of this function is to avoid | |
2164 | using the hard register directly in such a situation. */ | |
2165 | generating_concat_p = 0; | |
82d6e6fc | 2166 | new_rtx = gen_reg_rtx (GET_MODE (x)); |
3fb30019 | 2167 | generating_concat_p = 1; |
82d6e6fc KG |
2168 | emit_move_insn (new_rtx, x); |
2169 | return new_rtx; | |
3fb30019 RS |
2170 | } |
2171 | return x; | |
2172 | } | |
2173 | ||
5039610b | 2174 | /* Generate all the code for a CALL_EXPR exp |
51bbfa0c RS |
2175 | and return an rtx for its value. |
2176 | Store the value in TARGET (specified as an rtx) if convenient. | |
2177 | If the value is stored in TARGET then TARGET is returned. | |
2178 | If IGNORE is nonzero, then we ignore the value of the function call. */ | |
2179 | ||
2180 | rtx | |
d329e058 | 2181 | expand_call (tree exp, rtx target, int ignore) |
51bbfa0c | 2182 | { |
0a1c58a2 JL |
2183 | /* Nonzero if we are currently expanding a call. */ |
2184 | static int currently_expanding_call = 0; | |
2185 | ||
51bbfa0c RS |
2186 | /* RTX for the function to be called. */ |
2187 | rtx funexp; | |
0a1c58a2 | 2188 | /* Sequence of insns to perform a normal "call". */ |
48810515 | 2189 | rtx_insn *normal_call_insns = NULL; |
6de9cd9a | 2190 | /* Sequence of insns to perform a tail "call". */ |
48810515 | 2191 | rtx_insn *tail_call_insns = NULL; |
51bbfa0c RS |
2192 | /* Data type of the function. */ |
2193 | tree funtype; | |
ded9bf77 | 2194 | tree type_arg_types; |
28ed065e | 2195 | tree rettype; |
51bbfa0c RS |
2196 | /* Declaration of the function being called, |
2197 | or 0 if the function is computed (not known by name). */ | |
2198 | tree fndecl = 0; | |
57782ad8 MM |
2199 | /* The type of the function being called. */ |
2200 | tree fntype; | |
6de9cd9a | 2201 | bool try_tail_call = CALL_EXPR_TAILCALL (exp); |
0a1c58a2 | 2202 | int pass; |
51bbfa0c RS |
2203 | |
2204 | /* Register in which non-BLKmode value will be returned, | |
2205 | or 0 if no value or if value is BLKmode. */ | |
2206 | rtx valreg; | |
2207 | /* Address where we should return a BLKmode value; | |
2208 | 0 if value not BLKmode. */ | |
2209 | rtx structure_value_addr = 0; | |
2210 | /* Nonzero if that address is being passed by treating it as | |
2211 | an extra, implicit first parameter. Otherwise, | |
2212 | it is passed by being copied directly into struct_value_rtx. */ | |
2213 | int structure_value_addr_parm = 0; | |
078a18a4 SL |
2214 | /* Holds the value of implicit argument for the struct value. */ |
2215 | tree structure_value_addr_value = NULL_TREE; | |
51bbfa0c RS |
2216 | /* Size of aggregate value wanted, or zero if none wanted |
2217 | or if we are using the non-reentrant PCC calling convention | |
2218 | or expecting the value in registers. */ | |
e5e809f4 | 2219 | HOST_WIDE_INT struct_value_size = 0; |
51bbfa0c RS |
2220 | /* Nonzero if called function returns an aggregate in memory PCC style, |
2221 | by returning the address of where to find it. */ | |
2222 | int pcc_struct_value = 0; | |
61f71b34 | 2223 | rtx struct_value = 0; |
51bbfa0c RS |
2224 | |
2225 | /* Number of actual parameters in this call, including struct value addr. */ | |
2226 | int num_actuals; | |
2227 | /* Number of named args. Args after this are anonymous ones | |
2228 | and they must all go on the stack. */ | |
2229 | int n_named_args; | |
078a18a4 SL |
2230 | /* Number of complex actual arguments that need to be split. */ |
2231 | int num_complex_actuals = 0; | |
51bbfa0c RS |
2232 | |
2233 | /* Vector of information about each argument. | |
2234 | Arguments are numbered in the order they will be pushed, | |
2235 | not the order they are written. */ | |
2236 | struct arg_data *args; | |
2237 | ||
2238 | /* Total size in bytes of all the stack-parms scanned so far. */ | |
2239 | struct args_size args_size; | |
099e9712 | 2240 | struct args_size adjusted_args_size; |
51bbfa0c | 2241 | /* Size of arguments before any adjustments (such as rounding). */ |
599f37b6 | 2242 | int unadjusted_args_size; |
51bbfa0c | 2243 | /* Data on reg parms scanned so far. */ |
d5cc9181 JR |
2244 | CUMULATIVE_ARGS args_so_far_v; |
2245 | cumulative_args_t args_so_far; | |
51bbfa0c RS |
2246 | /* Nonzero if a reg parm has been scanned. */ |
2247 | int reg_parm_seen; | |
efd65a8b | 2248 | /* Nonzero if this is an indirect function call. */ |
51bbfa0c | 2249 | |
f725a3ec | 2250 | /* Nonzero if we must avoid push-insns in the args for this call. |
51bbfa0c RS |
2251 | If stack space is allocated for register parameters, but not by the |
2252 | caller, then it is preallocated in the fixed part of the stack frame. | |
2253 | So the entire argument block must then be preallocated (i.e., we | |
2254 | ignore PUSH_ROUNDING in that case). */ | |
2255 | ||
f73ad30e | 2256 | int must_preallocate = !PUSH_ARGS; |
51bbfa0c | 2257 | |
f72aed24 | 2258 | /* Size of the stack reserved for parameter registers. */ |
6f90e075 JW |
2259 | int reg_parm_stack_space = 0; |
2260 | ||
51bbfa0c RS |
2261 | /* Address of space preallocated for stack parms |
2262 | (on machines that lack push insns), or 0 if space not preallocated. */ | |
2263 | rtx argblock = 0; | |
2264 | ||
e384e6b5 | 2265 | /* Mask of ECF_ and ERF_ flags. */ |
f2d33f13 | 2266 | int flags = 0; |
e384e6b5 | 2267 | int return_flags = 0; |
f73ad30e | 2268 | #ifdef REG_PARM_STACK_SPACE |
51bbfa0c | 2269 | /* Define the boundary of the register parm stack space that needs to be |
b820d2b8 AM |
2270 | saved, if any. */ |
2271 | int low_to_save, high_to_save; | |
51bbfa0c RS |
2272 | rtx save_area = 0; /* Place that it is saved */ |
2273 | #endif | |
2274 | ||
51bbfa0c RS |
2275 | int initial_highest_arg_in_use = highest_outgoing_arg_in_use; |
2276 | char *initial_stack_usage_map = stack_usage_map; | |
d9725c41 | 2277 | char *stack_usage_map_buf = NULL; |
51bbfa0c | 2278 | |
38afb23f OH |
2279 | int old_stack_allocated; |
2280 | ||
2281 | /* State variables to track stack modifications. */ | |
51bbfa0c | 2282 | rtx old_stack_level = 0; |
38afb23f | 2283 | int old_stack_arg_under_construction = 0; |
79be3418 | 2284 | int old_pending_adj = 0; |
51bbfa0c | 2285 | int old_inhibit_defer_pop = inhibit_defer_pop; |
38afb23f OH |
2286 | |
2287 | /* Some stack pointer alterations we make are performed via | |
2288 | allocate_dynamic_stack_space. This modifies the stack_pointer_delta, | |
2289 | which we then also need to save/restore along the way. */ | |
a259f218 | 2290 | int old_stack_pointer_delta = 0; |
38afb23f | 2291 | |
0a1c58a2 | 2292 | rtx call_fusage; |
5039610b | 2293 | tree addr = CALL_EXPR_FN (exp); |
b3694847 | 2294 | int i; |
739fb049 | 2295 | /* The alignment of the stack, in bits. */ |
95899b34 | 2296 | unsigned HOST_WIDE_INT preferred_stack_boundary; |
739fb049 | 2297 | /* The alignment of the stack, in bytes. */ |
95899b34 | 2298 | unsigned HOST_WIDE_INT preferred_unit_stack_boundary; |
6de9cd9a DN |
2299 | /* The static chain value to use for this call. */ |
2300 | rtx static_chain_value; | |
f2d33f13 JH |
2301 | /* See if this is "nothrow" function call. */ |
2302 | if (TREE_NOTHROW (exp)) | |
2303 | flags |= ECF_NOTHROW; | |
2304 | ||
6de9cd9a DN |
2305 | /* See if we can find a DECL-node for the actual function, and get the |
2306 | function attributes (flags) from the function decl or type node. */ | |
39b0dce7 JM |
2307 | fndecl = get_callee_fndecl (exp); |
2308 | if (fndecl) | |
51bbfa0c | 2309 | { |
57782ad8 | 2310 | fntype = TREE_TYPE (fndecl); |
39b0dce7 | 2311 | flags |= flags_from_decl_or_type (fndecl); |
e384e6b5 | 2312 | return_flags |= decl_return_flags (fndecl); |
51bbfa0c | 2313 | } |
39b0dce7 | 2314 | else |
72954a4f | 2315 | { |
28ed065e | 2316 | fntype = TREE_TYPE (TREE_TYPE (addr)); |
57782ad8 | 2317 | flags |= flags_from_decl_or_type (fntype); |
72954a4f | 2318 | } |
28ed065e | 2319 | rettype = TREE_TYPE (exp); |
7393c642 | 2320 | |
57782ad8 | 2321 | struct_value = targetm.calls.struct_value_rtx (fntype, 0); |
61f71b34 | 2322 | |
8c6a8269 RS |
2323 | /* Warn if this value is an aggregate type, |
2324 | regardless of which calling convention we are using for it. */ | |
28ed065e | 2325 | if (AGGREGATE_TYPE_P (rettype)) |
ccf08a6e | 2326 | warning (OPT_Waggregate_return, "function call has aggregate value"); |
8c6a8269 | 2327 | |
becfd6e5 KZ |
2328 | /* If the result of a non looping pure or const function call is |
2329 | ignored (or void), and none of its arguments are volatile, we can | |
2330 | avoid expanding the call and just evaluate the arguments for | |
2331 | side-effects. */ | |
8c6a8269 | 2332 | if ((flags & (ECF_CONST | ECF_PURE)) |
becfd6e5 | 2333 | && (!(flags & ECF_LOOPING_CONST_OR_PURE)) |
8c6a8269 | 2334 | && (ignore || target == const0_rtx |
28ed065e | 2335 | || TYPE_MODE (rettype) == VOIDmode)) |
8c6a8269 RS |
2336 | { |
2337 | bool volatilep = false; | |
2338 | tree arg; | |
078a18a4 | 2339 | call_expr_arg_iterator iter; |
8c6a8269 | 2340 | |
078a18a4 SL |
2341 | FOR_EACH_CALL_EXPR_ARG (arg, iter, exp) |
2342 | if (TREE_THIS_VOLATILE (arg)) | |
8c6a8269 RS |
2343 | { |
2344 | volatilep = true; | |
2345 | break; | |
2346 | } | |
2347 | ||
2348 | if (! volatilep) | |
2349 | { | |
078a18a4 SL |
2350 | FOR_EACH_CALL_EXPR_ARG (arg, iter, exp) |
2351 | expand_expr (arg, const0_rtx, VOIDmode, EXPAND_NORMAL); | |
8c6a8269 RS |
2352 | return const0_rtx; |
2353 | } | |
2354 | } | |
2355 | ||
6f90e075 | 2356 | #ifdef REG_PARM_STACK_SPACE |
5d059ed9 | 2357 | reg_parm_stack_space = REG_PARM_STACK_SPACE (!fndecl ? fntype : fndecl); |
6f90e075 | 2358 | #endif |
6f90e075 | 2359 | |
5d059ed9 | 2360 | if (! OUTGOING_REG_PARM_STACK_SPACE ((!fndecl ? fntype : TREE_TYPE (fndecl))) |
81464b2c | 2361 | && reg_parm_stack_space > 0 && PUSH_ARGS) |
e5e809f4 | 2362 | must_preallocate = 1; |
e5e809f4 | 2363 | |
51bbfa0c RS |
2364 | /* Set up a place to return a structure. */ |
2365 | ||
2366 | /* Cater to broken compilers. */ | |
d47d0a8d | 2367 | if (aggregate_value_p (exp, fntype)) |
51bbfa0c RS |
2368 | { |
2369 | /* This call returns a big structure. */ | |
84b8030f | 2370 | flags &= ~(ECF_CONST | ECF_PURE | ECF_LOOPING_CONST_OR_PURE); |
51bbfa0c RS |
2371 | |
2372 | #ifdef PCC_STATIC_STRUCT_RETURN | |
9e7b1d0a RS |
2373 | { |
2374 | pcc_struct_value = 1; | |
9e7b1d0a RS |
2375 | } |
2376 | #else /* not PCC_STATIC_STRUCT_RETURN */ | |
2377 | { | |
28ed065e | 2378 | struct_value_size = int_size_in_bytes (rettype); |
51bbfa0c | 2379 | |
fa47911c | 2380 | if (target && MEM_P (target) && CALL_EXPR_RETURN_SLOT_OPT (exp)) |
9e7b1d0a RS |
2381 | structure_value_addr = XEXP (target, 0); |
2382 | else | |
2383 | { | |
9e7b1d0a RS |
2384 | /* For variable-sized objects, we must be called with a target |
2385 | specified. If we were to allocate space on the stack here, | |
2386 | we would have no way of knowing when to free it. */ | |
9474e8ab | 2387 | rtx d = assign_temp (rettype, 1, 1); |
4361b41d | 2388 | structure_value_addr = XEXP (d, 0); |
9e7b1d0a RS |
2389 | target = 0; |
2390 | } | |
2391 | } | |
2392 | #endif /* not PCC_STATIC_STRUCT_RETURN */ | |
51bbfa0c RS |
2393 | } |
2394 | ||
099e9712 | 2395 | /* Figure out the amount to which the stack should be aligned. */ |
099e9712 | 2396 | preferred_stack_boundary = PREFERRED_STACK_BOUNDARY; |
b255a036 JH |
2397 | if (fndecl) |
2398 | { | |
3dafb85c | 2399 | struct cgraph_rtl_info *i = cgraph_node::rtl_info (fndecl); |
17b29c0a L |
2400 | /* Without automatic stack alignment, we can't increase preferred |
2401 | stack boundary. With automatic stack alignment, it is | |
2402 | unnecessary since unless we can guarantee that all callers will | |
2403 | align the outgoing stack properly, callee has to align its | |
2404 | stack anyway. */ | |
2405 | if (i | |
2406 | && i->preferred_incoming_stack_boundary | |
2407 | && i->preferred_incoming_stack_boundary < preferred_stack_boundary) | |
b255a036 JH |
2408 | preferred_stack_boundary = i->preferred_incoming_stack_boundary; |
2409 | } | |
099e9712 JH |
2410 | |
2411 | /* Operand 0 is a pointer-to-function; get the type of the function. */ | |
09e2bf48 | 2412 | funtype = TREE_TYPE (addr); |
366de0ce | 2413 | gcc_assert (POINTER_TYPE_P (funtype)); |
099e9712 JH |
2414 | funtype = TREE_TYPE (funtype); |
2415 | ||
078a18a4 SL |
2416 | /* Count whether there are actual complex arguments that need to be split |
2417 | into their real and imaginary parts. Munge the type_arg_types | |
2418 | appropriately here as well. */ | |
42ba5130 | 2419 | if (targetm.calls.split_complex_arg) |
ded9bf77 | 2420 | { |
078a18a4 SL |
2421 | call_expr_arg_iterator iter; |
2422 | tree arg; | |
2423 | FOR_EACH_CALL_EXPR_ARG (arg, iter, exp) | |
2424 | { | |
2425 | tree type = TREE_TYPE (arg); | |
2426 | if (type && TREE_CODE (type) == COMPLEX_TYPE | |
2427 | && targetm.calls.split_complex_arg (type)) | |
2428 | num_complex_actuals++; | |
2429 | } | |
ded9bf77 | 2430 | type_arg_types = split_complex_types (TYPE_ARG_TYPES (funtype)); |
ded9bf77 AH |
2431 | } |
2432 | else | |
2433 | type_arg_types = TYPE_ARG_TYPES (funtype); | |
2434 | ||
099e9712 | 2435 | if (flags & ECF_MAY_BE_ALLOCA) |
e3b5732b | 2436 | cfun->calls_alloca = 1; |
099e9712 JH |
2437 | |
2438 | /* If struct_value_rtx is 0, it means pass the address | |
078a18a4 SL |
2439 | as if it were an extra parameter. Put the argument expression |
2440 | in structure_value_addr_value. */ | |
61f71b34 | 2441 | if (structure_value_addr && struct_value == 0) |
099e9712 JH |
2442 | { |
2443 | /* If structure_value_addr is a REG other than | |
2444 | virtual_outgoing_args_rtx, we can use always use it. If it | |
2445 | is not a REG, we must always copy it into a register. | |
2446 | If it is virtual_outgoing_args_rtx, we must copy it to another | |
2447 | register in some cases. */ | |
f8cfc6aa | 2448 | rtx temp = (!REG_P (structure_value_addr) |
099e9712 JH |
2449 | || (ACCUMULATE_OUTGOING_ARGS |
2450 | && stack_arg_under_construction | |
2451 | && structure_value_addr == virtual_outgoing_args_rtx) | |
7ae4ad28 | 2452 | ? copy_addr_to_reg (convert_memory_address |
57782ad8 | 2453 | (Pmode, structure_value_addr)) |
099e9712 JH |
2454 | : structure_value_addr); |
2455 | ||
078a18a4 SL |
2456 | structure_value_addr_value = |
2457 | make_tree (build_pointer_type (TREE_TYPE (funtype)), temp); | |
099e9712 JH |
2458 | structure_value_addr_parm = 1; |
2459 | } | |
2460 | ||
2461 | /* Count the arguments and set NUM_ACTUALS. */ | |
078a18a4 SL |
2462 | num_actuals = |
2463 | call_expr_nargs (exp) + num_complex_actuals + structure_value_addr_parm; | |
099e9712 JH |
2464 | |
2465 | /* Compute number of named args. | |
3a4d587b AM |
2466 | First, do a raw count of the args for INIT_CUMULATIVE_ARGS. */ |
2467 | ||
2468 | if (type_arg_types != 0) | |
2469 | n_named_args | |
2470 | = (list_length (type_arg_types) | |
2471 | /* Count the struct value address, if it is passed as a parm. */ | |
2472 | + structure_value_addr_parm); | |
2473 | else | |
2474 | /* If we know nothing, treat all args as named. */ | |
2475 | n_named_args = num_actuals; | |
2476 | ||
2477 | /* Start updating where the next arg would go. | |
2478 | ||
2479 | On some machines (such as the PA) indirect calls have a different | |
2480 | calling convention than normal calls. The fourth argument in | |
2481 | INIT_CUMULATIVE_ARGS tells the backend if this is an indirect call | |
2482 | or not. */ | |
d5cc9181 JR |
2483 | INIT_CUMULATIVE_ARGS (args_so_far_v, funtype, NULL_RTX, fndecl, n_named_args); |
2484 | args_so_far = pack_cumulative_args (&args_so_far_v); | |
3a4d587b AM |
2485 | |
2486 | /* Now possibly adjust the number of named args. | |
099e9712 | 2487 | Normally, don't include the last named arg if anonymous args follow. |
3a179764 KH |
2488 | We do include the last named arg if |
2489 | targetm.calls.strict_argument_naming() returns nonzero. | |
099e9712 JH |
2490 | (If no anonymous args follow, the result of list_length is actually |
2491 | one too large. This is harmless.) | |
2492 | ||
4ac8340c | 2493 | If targetm.calls.pretend_outgoing_varargs_named() returns |
3a179764 KH |
2494 | nonzero, and targetm.calls.strict_argument_naming() returns zero, |
2495 | this machine will be able to place unnamed args that were passed | |
2496 | in registers into the stack. So treat all args as named. This | |
2497 | allows the insns emitting for a specific argument list to be | |
2498 | independent of the function declaration. | |
4ac8340c KH |
2499 | |
2500 | If targetm.calls.pretend_outgoing_varargs_named() returns zero, | |
2501 | we do not have any reliable way to pass unnamed args in | |
2502 | registers, so we must force them into memory. */ | |
099e9712 | 2503 | |
3a4d587b | 2504 | if (type_arg_types != 0 |
d5cc9181 | 2505 | && targetm.calls.strict_argument_naming (args_so_far)) |
3a4d587b AM |
2506 | ; |
2507 | else if (type_arg_types != 0 | |
d5cc9181 | 2508 | && ! targetm.calls.pretend_outgoing_varargs_named (args_so_far)) |
3a4d587b AM |
2509 | /* Don't include the last named arg. */ |
2510 | --n_named_args; | |
099e9712 | 2511 | else |
3a4d587b | 2512 | /* Treat all args as named. */ |
099e9712 JH |
2513 | n_named_args = num_actuals; |
2514 | ||
099e9712 | 2515 | /* Make a vector to hold all the information about each arg. */ |
f883e0a7 | 2516 | args = XALLOCAVEC (struct arg_data, num_actuals); |
703ad42b | 2517 | memset (args, 0, num_actuals * sizeof (struct arg_data)); |
099e9712 | 2518 | |
d80d2d2a KH |
2519 | /* Build up entries in the ARGS array, compute the size of the |
2520 | arguments into ARGS_SIZE, etc. */ | |
099e9712 | 2521 | initialize_argument_information (num_actuals, args, &args_size, |
078a18a4 | 2522 | n_named_args, exp, |
45769134 | 2523 | structure_value_addr_value, fndecl, fntype, |
d5cc9181 | 2524 | args_so_far, reg_parm_stack_space, |
099e9712 | 2525 | &old_stack_level, &old_pending_adj, |
dd292d0a | 2526 | &must_preallocate, &flags, |
6de9cd9a | 2527 | &try_tail_call, CALL_FROM_THUNK_P (exp)); |
099e9712 JH |
2528 | |
2529 | if (args_size.var) | |
84b8030f | 2530 | must_preallocate = 1; |
099e9712 JH |
2531 | |
2532 | /* Now make final decision about preallocating stack space. */ | |
2533 | must_preallocate = finalize_must_preallocate (must_preallocate, | |
2534 | num_actuals, args, | |
2535 | &args_size); | |
2536 | ||
2537 | /* If the structure value address will reference the stack pointer, we | |
2538 | must stabilize it. We don't need to do this if we know that we are | |
2539 | not going to adjust the stack pointer in processing this call. */ | |
2540 | ||
2541 | if (structure_value_addr | |
2542 | && (reg_mentioned_p (virtual_stack_dynamic_rtx, structure_value_addr) | |
2543 | || reg_mentioned_p (virtual_outgoing_args_rtx, | |
2544 | structure_value_addr)) | |
2545 | && (args_size.var | |
2546 | || (!ACCUMULATE_OUTGOING_ARGS && args_size.constant))) | |
2547 | structure_value_addr = copy_to_reg (structure_value_addr); | |
0a1c58a2 | 2548 | |
7ae4ad28 | 2549 | /* Tail calls can make things harder to debug, and we've traditionally |
194c7c45 | 2550 | pushed these optimizations into -O2. Don't try if we're already |
fb158467 | 2551 | expanding a call, as that means we're an argument. Don't try if |
3fbd86b1 | 2552 | there's cleanups, as we know there's code to follow the call. */ |
0a1c58a2 | 2553 | |
099e9712 JH |
2554 | if (currently_expanding_call++ != 0 |
2555 | || !flag_optimize_sibling_calls | |
6de9cd9a | 2556 | || args_size.var |
6fb5fa3c | 2557 | || dbg_cnt (tail_call) == false) |
6de9cd9a | 2558 | try_tail_call = 0; |
099e9712 JH |
2559 | |
2560 | /* Rest of purposes for tail call optimizations to fail. */ | |
2561 | if ( | |
2562 | #ifdef HAVE_sibcall_epilogue | |
2563 | !HAVE_sibcall_epilogue | |
2564 | #else | |
2565 | 1 | |
2566 | #endif | |
2567 | || !try_tail_call | |
2568 | /* Doing sibling call optimization needs some work, since | |
2569 | structure_value_addr can be allocated on the stack. | |
2570 | It does not seem worth the effort since few optimizable | |
2571 | sibling calls will return a structure. */ | |
2572 | || structure_value_addr != NULL_RTX | |
130423d7 | 2573 | #ifdef REG_PARM_STACK_SPACE |
0e456625 JH |
2574 | /* If outgoing reg parm stack space changes, we can not do sibcall. */ |
2575 | || (OUTGOING_REG_PARM_STACK_SPACE (funtype) | |
2576 | != OUTGOING_REG_PARM_STACK_SPACE (TREE_TYPE (current_function_decl))) | |
deb1de67 | 2577 | || (reg_parm_stack_space != REG_PARM_STACK_SPACE (current_function_decl)) |
130423d7 | 2578 | #endif |
4977bab6 ZW |
2579 | /* Check whether the target is able to optimize the call |
2580 | into a sibcall. */ | |
5fd9b178 | 2581 | || !targetm.function_ok_for_sibcall (fndecl, exp) |
4977bab6 | 2582 | /* Functions that do not return exactly once may not be sibcall |
c22cacf3 | 2583 | optimized. */ |
6e14af16 | 2584 | || (flags & (ECF_RETURNS_TWICE | ECF_NORETURN)) |
09e2bf48 | 2585 | || TYPE_VOLATILE (TREE_TYPE (TREE_TYPE (addr))) |
6a48df45 | 2586 | /* If the called function is nested in the current one, it might access |
c22cacf3 MS |
2587 | some of the caller's arguments, but could clobber them beforehand if |
2588 | the argument areas are shared. */ | |
6a48df45 | 2589 | || (fndecl && decl_function_context (fndecl) == current_function_decl) |
099e9712 | 2590 | /* If this function requires more stack slots than the current |
ff7f012a | 2591 | function, we cannot change it into a sibling call. |
38173d38 | 2592 | crtl->args.pretend_args_size is not part of the |
ff7f012a | 2593 | stack allocated by our caller. */ |
38173d38 JH |
2594 | || args_size.constant > (crtl->args.size |
2595 | - crtl->args.pretend_args_size) | |
099e9712 JH |
2596 | /* If the callee pops its own arguments, then it must pop exactly |
2597 | the same number of arguments as the current function. */ | |
079e7538 NF |
2598 | || (targetm.calls.return_pops_args (fndecl, funtype, args_size.constant) |
2599 | != targetm.calls.return_pops_args (current_function_decl, | |
2600 | TREE_TYPE (current_function_decl), | |
2601 | crtl->args.size)) | |
ae2bcd98 | 2602 | || !lang_hooks.decls.ok_for_sibcall (fndecl)) |
e6f64875 | 2603 | try_tail_call = 0; |
497eb8c3 | 2604 | |
c69cd1f5 JJ |
2605 | /* Check if caller and callee disagree in promotion of function |
2606 | return value. */ | |
2607 | if (try_tail_call) | |
2608 | { | |
2609 | enum machine_mode caller_mode, caller_promoted_mode; | |
2610 | enum machine_mode callee_mode, callee_promoted_mode; | |
2611 | int caller_unsignedp, callee_unsignedp; | |
2612 | tree caller_res = DECL_RESULT (current_function_decl); | |
2613 | ||
2614 | caller_unsignedp = TYPE_UNSIGNED (TREE_TYPE (caller_res)); | |
cde0f3fd | 2615 | caller_mode = DECL_MODE (caller_res); |
c69cd1f5 | 2616 | callee_unsignedp = TYPE_UNSIGNED (TREE_TYPE (funtype)); |
cde0f3fd PB |
2617 | callee_mode = TYPE_MODE (TREE_TYPE (funtype)); |
2618 | caller_promoted_mode | |
2619 | = promote_function_mode (TREE_TYPE (caller_res), caller_mode, | |
2620 | &caller_unsignedp, | |
2621 | TREE_TYPE (current_function_decl), 1); | |
2622 | callee_promoted_mode | |
666e3ceb | 2623 | = promote_function_mode (TREE_TYPE (funtype), callee_mode, |
cde0f3fd | 2624 | &callee_unsignedp, |
666e3ceb | 2625 | funtype, 1); |
c69cd1f5 JJ |
2626 | if (caller_mode != VOIDmode |
2627 | && (caller_promoted_mode != callee_promoted_mode | |
2628 | || ((caller_mode != caller_promoted_mode | |
2629 | || callee_mode != callee_promoted_mode) | |
2630 | && (caller_unsignedp != callee_unsignedp | |
2631 | || GET_MODE_BITSIZE (caller_mode) | |
2632 | < GET_MODE_BITSIZE (callee_mode))))) | |
2633 | try_tail_call = 0; | |
2634 | } | |
2635 | ||
01973e26 L |
2636 | /* Ensure current function's preferred stack boundary is at least |
2637 | what we need. Stack alignment may also increase preferred stack | |
2638 | boundary. */ | |
b5f772ce | 2639 | if (crtl->preferred_stack_boundary < preferred_stack_boundary) |
cb91fab0 | 2640 | crtl->preferred_stack_boundary = preferred_stack_boundary; |
01973e26 L |
2641 | else |
2642 | preferred_stack_boundary = crtl->preferred_stack_boundary; | |
c2f8b491 | 2643 | |
099e9712 | 2644 | preferred_unit_stack_boundary = preferred_stack_boundary / BITS_PER_UNIT; |
497eb8c3 | 2645 | |
0a1c58a2 JL |
2646 | /* We want to make two insn chains; one for a sibling call, the other |
2647 | for a normal call. We will select one of the two chains after | |
2648 | initial RTL generation is complete. */ | |
b820d2b8 | 2649 | for (pass = try_tail_call ? 0 : 1; pass < 2; pass++) |
0a1c58a2 JL |
2650 | { |
2651 | int sibcall_failure = 0; | |
f5143c46 | 2652 | /* We want to emit any pending stack adjustments before the tail |
0a1c58a2 | 2653 | recursion "call". That way we know any adjustment after the tail |
7ae4ad28 | 2654 | recursion call can be ignored if we indeed use the tail |
0a1c58a2 | 2655 | call expansion. */ |
7f2f0a01 | 2656 | saved_pending_stack_adjust save; |
48810515 DM |
2657 | rtx_insn *insns, *before_call, *after_args; |
2658 | rtx next_arg_reg; | |
39842893 | 2659 | |
0a1c58a2 JL |
2660 | if (pass == 0) |
2661 | { | |
0a1c58a2 JL |
2662 | /* State variables we need to save and restore between |
2663 | iterations. */ | |
7f2f0a01 | 2664 | save_pending_stack_adjust (&save); |
0a1c58a2 | 2665 | } |
f2d33f13 JH |
2666 | if (pass) |
2667 | flags &= ~ECF_SIBCALL; | |
2668 | else | |
2669 | flags |= ECF_SIBCALL; | |
51bbfa0c | 2670 | |
0a1c58a2 | 2671 | /* Other state variables that we must reinitialize each time |
f2d33f13 | 2672 | through the loop (that are not initialized by the loop itself). */ |
0a1c58a2 JL |
2673 | argblock = 0; |
2674 | call_fusage = 0; | |
fa76d9e0 | 2675 | |
f725a3ec | 2676 | /* Start a new sequence for the normal call case. |
51bbfa0c | 2677 | |
0a1c58a2 JL |
2678 | From this point on, if the sibling call fails, we want to set |
2679 | sibcall_failure instead of continuing the loop. */ | |
2680 | start_sequence (); | |
eecb6f50 | 2681 | |
0a1c58a2 JL |
2682 | /* Don't let pending stack adjusts add up to too much. |
2683 | Also, do all pending adjustments now if there is any chance | |
2684 | this might be a call to alloca or if we are expanding a sibling | |
9dd9bf80 | 2685 | call sequence. |
63579539 DJ |
2686 | Also do the adjustments before a throwing call, otherwise |
2687 | exception handling can fail; PR 19225. */ | |
0a1c58a2 | 2688 | if (pending_stack_adjust >= 32 |
b5cd4ed4 | 2689 | || (pending_stack_adjust > 0 |
9dd9bf80 | 2690 | && (flags & ECF_MAY_BE_ALLOCA)) |
63579539 DJ |
2691 | || (pending_stack_adjust > 0 |
2692 | && flag_exceptions && !(flags & ECF_NOTHROW)) | |
0a1c58a2 JL |
2693 | || pass == 0) |
2694 | do_pending_stack_adjust (); | |
51bbfa0c | 2695 | |
0a1c58a2 | 2696 | /* Precompute any arguments as needed. */ |
f8a097cd | 2697 | if (pass) |
84b8030f | 2698 | precompute_arguments (num_actuals, args); |
51bbfa0c | 2699 | |
0a1c58a2 JL |
2700 | /* Now we are about to start emitting insns that can be deleted |
2701 | if a libcall is deleted. */ | |
84b8030f | 2702 | if (pass && (flags & ECF_MALLOC)) |
0a1c58a2 | 2703 | start_sequence (); |
51bbfa0c | 2704 | |
cb91fab0 | 2705 | if (pass == 0 && crtl->stack_protect_guard) |
b755446c RH |
2706 | stack_protect_epilogue (); |
2707 | ||
099e9712 | 2708 | adjusted_args_size = args_size; |
ce48579b RH |
2709 | /* Compute the actual size of the argument block required. The variable |
2710 | and constant sizes must be combined, the size may have to be rounded, | |
2711 | and there may be a minimum required size. When generating a sibcall | |
2712 | pattern, do not round up, since we'll be re-using whatever space our | |
2713 | caller provided. */ | |
2714 | unadjusted_args_size | |
f725a3ec KH |
2715 | = compute_argument_block_size (reg_parm_stack_space, |
2716 | &adjusted_args_size, | |
5d059ed9 | 2717 | fndecl, fntype, |
ce48579b RH |
2718 | (pass == 0 ? 0 |
2719 | : preferred_stack_boundary)); | |
2720 | ||
f725a3ec | 2721 | old_stack_allocated = stack_pointer_delta - pending_stack_adjust; |
ce48579b | 2722 | |
f8a097cd | 2723 | /* The argument block when performing a sibling call is the |
c22cacf3 | 2724 | incoming argument block. */ |
f8a097cd | 2725 | if (pass == 0) |
c67846f2 | 2726 | { |
2e3f842f | 2727 | argblock = crtl->args.internal_arg_pointer; |
fcae219a R |
2728 | argblock |
2729 | #ifdef STACK_GROWS_DOWNWARD | |
0a81f074 | 2730 | = plus_constant (Pmode, argblock, crtl->args.pretend_args_size); |
fcae219a | 2731 | #else |
0a81f074 | 2732 | = plus_constant (Pmode, argblock, -crtl->args.pretend_args_size); |
fcae219a | 2733 | #endif |
c67846f2 | 2734 | stored_args_map = sbitmap_alloc (args_size.constant); |
f61e445a | 2735 | bitmap_clear (stored_args_map); |
c67846f2 | 2736 | } |
ce48579b | 2737 | |
0a1c58a2 JL |
2738 | /* If we have no actual push instructions, or shouldn't use them, |
2739 | make space for all args right now. */ | |
099e9712 | 2740 | else if (adjusted_args_size.var != 0) |
51bbfa0c | 2741 | { |
0a1c58a2 JL |
2742 | if (old_stack_level == 0) |
2743 | { | |
9eac0f2a | 2744 | emit_stack_save (SAVE_BLOCK, &old_stack_level); |
38afb23f | 2745 | old_stack_pointer_delta = stack_pointer_delta; |
0a1c58a2 JL |
2746 | old_pending_adj = pending_stack_adjust; |
2747 | pending_stack_adjust = 0; | |
0a1c58a2 JL |
2748 | /* stack_arg_under_construction says whether a stack arg is |
2749 | being constructed at the old stack level. Pushing the stack | |
2750 | gets a clean outgoing argument block. */ | |
2751 | old_stack_arg_under_construction = stack_arg_under_construction; | |
2752 | stack_arg_under_construction = 0; | |
0a1c58a2 | 2753 | } |
099e9712 | 2754 | argblock = push_block (ARGS_SIZE_RTX (adjusted_args_size), 0, 0); |
a11e0df4 | 2755 | if (flag_stack_usage_info) |
d3c12306 | 2756 | current_function_has_unbounded_dynamic_stack_size = 1; |
51bbfa0c | 2757 | } |
0a1c58a2 JL |
2758 | else |
2759 | { | |
2760 | /* Note that we must go through the motions of allocating an argument | |
2761 | block even if the size is zero because we may be storing args | |
2762 | in the area reserved for register arguments, which may be part of | |
2763 | the stack frame. */ | |
26a258fe | 2764 | |
099e9712 | 2765 | int needed = adjusted_args_size.constant; |
51bbfa0c | 2766 | |
0a1c58a2 JL |
2767 | /* Store the maximum argument space used. It will be pushed by |
2768 | the prologue (if ACCUMULATE_OUTGOING_ARGS, or stack overflow | |
2769 | checking). */ | |
51bbfa0c | 2770 | |
38173d38 JH |
2771 | if (needed > crtl->outgoing_args_size) |
2772 | crtl->outgoing_args_size = needed; | |
51bbfa0c | 2773 | |
0a1c58a2 JL |
2774 | if (must_preallocate) |
2775 | { | |
f73ad30e JH |
2776 | if (ACCUMULATE_OUTGOING_ARGS) |
2777 | { | |
f8a097cd JH |
2778 | /* Since the stack pointer will never be pushed, it is |
2779 | possible for the evaluation of a parm to clobber | |
2780 | something we have already written to the stack. | |
2781 | Since most function calls on RISC machines do not use | |
2782 | the stack, this is uncommon, but must work correctly. | |
26a258fe | 2783 | |
f73ad30e | 2784 | Therefore, we save any area of the stack that was already |
f8a097cd JH |
2785 | written and that we are using. Here we set up to do this |
2786 | by making a new stack usage map from the old one. The | |
f725a3ec | 2787 | actual save will be done by store_one_arg. |
26a258fe | 2788 | |
f73ad30e JH |
2789 | Another approach might be to try to reorder the argument |
2790 | evaluations to avoid this conflicting stack usage. */ | |
26a258fe | 2791 | |
f8a097cd JH |
2792 | /* Since we will be writing into the entire argument area, |
2793 | the map must be allocated for its entire size, not just | |
2794 | the part that is the responsibility of the caller. */ | |
5d059ed9 | 2795 | if (! OUTGOING_REG_PARM_STACK_SPACE ((!fndecl ? fntype : TREE_TYPE (fndecl)))) |
ac294f0b | 2796 | needed += reg_parm_stack_space; |
51bbfa0c RS |
2797 | |
2798 | #ifdef ARGS_GROW_DOWNWARD | |
f73ad30e JH |
2799 | highest_outgoing_arg_in_use = MAX (initial_highest_arg_in_use, |
2800 | needed + 1); | |
51bbfa0c | 2801 | #else |
f73ad30e JH |
2802 | highest_outgoing_arg_in_use = MAX (initial_highest_arg_in_use, |
2803 | needed); | |
51bbfa0c | 2804 | #endif |
04695783 | 2805 | free (stack_usage_map_buf); |
5ed6ace5 | 2806 | stack_usage_map_buf = XNEWVEC (char, highest_outgoing_arg_in_use); |
d9725c41 | 2807 | stack_usage_map = stack_usage_map_buf; |
51bbfa0c | 2808 | |
f73ad30e | 2809 | if (initial_highest_arg_in_use) |
2e09e75a JM |
2810 | memcpy (stack_usage_map, initial_stack_usage_map, |
2811 | initial_highest_arg_in_use); | |
2f4aa534 | 2812 | |
f73ad30e | 2813 | if (initial_highest_arg_in_use != highest_outgoing_arg_in_use) |
961192e1 | 2814 | memset (&stack_usage_map[initial_highest_arg_in_use], 0, |
f73ad30e JH |
2815 | (highest_outgoing_arg_in_use |
2816 | - initial_highest_arg_in_use)); | |
2817 | needed = 0; | |
2f4aa534 | 2818 | |
f8a097cd JH |
2819 | /* The address of the outgoing argument list must not be |
2820 | copied to a register here, because argblock would be left | |
2821 | pointing to the wrong place after the call to | |
f725a3ec | 2822 | allocate_dynamic_stack_space below. */ |
2f4aa534 | 2823 | |
f73ad30e | 2824 | argblock = virtual_outgoing_args_rtx; |
f725a3ec | 2825 | } |
f73ad30e | 2826 | else |
26a258fe | 2827 | { |
f73ad30e | 2828 | if (inhibit_defer_pop == 0) |
0a1c58a2 | 2829 | { |
f73ad30e | 2830 | /* Try to reuse some or all of the pending_stack_adjust |
ce48579b RH |
2831 | to get this space. */ |
2832 | needed | |
f725a3ec | 2833 | = (combine_pending_stack_adjustment_and_call |
ce48579b | 2834 | (unadjusted_args_size, |
099e9712 | 2835 | &adjusted_args_size, |
ce48579b RH |
2836 | preferred_unit_stack_boundary)); |
2837 | ||
2838 | /* combine_pending_stack_adjustment_and_call computes | |
2839 | an adjustment before the arguments are allocated. | |
2840 | Account for them and see whether or not the stack | |
2841 | needs to go up or down. */ | |
2842 | needed = unadjusted_args_size - needed; | |
2843 | ||
2844 | if (needed < 0) | |
f73ad30e | 2845 | { |
ce48579b RH |
2846 | /* We're releasing stack space. */ |
2847 | /* ??? We can avoid any adjustment at all if we're | |
2848 | already aligned. FIXME. */ | |
2849 | pending_stack_adjust = -needed; | |
2850 | do_pending_stack_adjust (); | |
f73ad30e JH |
2851 | needed = 0; |
2852 | } | |
f725a3ec | 2853 | else |
ce48579b RH |
2854 | /* We need to allocate space. We'll do that in |
2855 | push_block below. */ | |
2856 | pending_stack_adjust = 0; | |
0a1c58a2 | 2857 | } |
ce48579b RH |
2858 | |
2859 | /* Special case this because overhead of `push_block' in | |
2860 | this case is non-trivial. */ | |
f73ad30e JH |
2861 | if (needed == 0) |
2862 | argblock = virtual_outgoing_args_rtx; | |
0a1c58a2 | 2863 | else |
d892f288 DD |
2864 | { |
2865 | argblock = push_block (GEN_INT (needed), 0, 0); | |
2866 | #ifdef ARGS_GROW_DOWNWARD | |
0a81f074 | 2867 | argblock = plus_constant (Pmode, argblock, needed); |
d892f288 DD |
2868 | #endif |
2869 | } | |
f73ad30e | 2870 | |
f8a097cd JH |
2871 | /* We only really need to call `copy_to_reg' in the case |
2872 | where push insns are going to be used to pass ARGBLOCK | |
2873 | to a function call in ARGS. In that case, the stack | |
2874 | pointer changes value from the allocation point to the | |
2875 | call point, and hence the value of | |
2876 | VIRTUAL_OUTGOING_ARGS_RTX changes as well. But might | |
2877 | as well always do it. */ | |
f73ad30e | 2878 | argblock = copy_to_reg (argblock); |
38afb23f OH |
2879 | } |
2880 | } | |
2881 | } | |
0a1c58a2 | 2882 | |
38afb23f OH |
2883 | if (ACCUMULATE_OUTGOING_ARGS) |
2884 | { | |
2885 | /* The save/restore code in store_one_arg handles all | |
2886 | cases except one: a constructor call (including a C | |
2887 | function returning a BLKmode struct) to initialize | |
2888 | an argument. */ | |
2889 | if (stack_arg_under_construction) | |
2890 | { | |
ac294f0b KT |
2891 | rtx push_size |
2892 | = GEN_INT (adjusted_args_size.constant | |
5d059ed9 | 2893 | + (OUTGOING_REG_PARM_STACK_SPACE ((!fndecl ? fntype |
81464b2c | 2894 | : TREE_TYPE (fndecl))) ? 0 |
ac294f0b | 2895 | : reg_parm_stack_space)); |
38afb23f OH |
2896 | if (old_stack_level == 0) |
2897 | { | |
9eac0f2a | 2898 | emit_stack_save (SAVE_BLOCK, &old_stack_level); |
38afb23f OH |
2899 | old_stack_pointer_delta = stack_pointer_delta; |
2900 | old_pending_adj = pending_stack_adjust; | |
2901 | pending_stack_adjust = 0; | |
2902 | /* stack_arg_under_construction says whether a stack | |
2903 | arg is being constructed at the old stack level. | |
2904 | Pushing the stack gets a clean outgoing argument | |
2905 | block. */ | |
2906 | old_stack_arg_under_construction | |
2907 | = stack_arg_under_construction; | |
2908 | stack_arg_under_construction = 0; | |
2909 | /* Make a new map for the new argument list. */ | |
04695783 | 2910 | free (stack_usage_map_buf); |
b9eae1a9 | 2911 | stack_usage_map_buf = XCNEWVEC (char, highest_outgoing_arg_in_use); |
d9725c41 | 2912 | stack_usage_map = stack_usage_map_buf; |
38afb23f | 2913 | highest_outgoing_arg_in_use = 0; |
f73ad30e | 2914 | } |
d3c12306 EB |
2915 | /* We can pass TRUE as the 4th argument because we just |
2916 | saved the stack pointer and will restore it right after | |
2917 | the call. */ | |
3a42502d RH |
2918 | allocate_dynamic_stack_space (push_size, 0, |
2919 | BIGGEST_ALIGNMENT, true); | |
0a1c58a2 | 2920 | } |
bfbf933a | 2921 | |
38afb23f OH |
2922 | /* If argument evaluation might modify the stack pointer, |
2923 | copy the address of the argument list to a register. */ | |
2924 | for (i = 0; i < num_actuals; i++) | |
2925 | if (args[i].pass_on_stack) | |
2926 | { | |
2927 | argblock = copy_addr_to_reg (argblock); | |
2928 | break; | |
2929 | } | |
2930 | } | |
d329e058 | 2931 | |
0a1c58a2 | 2932 | compute_argument_addresses (args, argblock, num_actuals); |
bfbf933a | 2933 | |
3d9684ae JG |
2934 | /* Perform stack alignment before the first push (the last arg). */ |
2935 | if (argblock == 0 | |
f830ddc2 | 2936 | && adjusted_args_size.constant > reg_parm_stack_space |
099e9712 | 2937 | && adjusted_args_size.constant != unadjusted_args_size) |
4e217aed | 2938 | { |
0a1c58a2 JL |
2939 | /* When the stack adjustment is pending, we get better code |
2940 | by combining the adjustments. */ | |
f725a3ec | 2941 | if (pending_stack_adjust |
0a1c58a2 | 2942 | && ! inhibit_defer_pop) |
ce48579b RH |
2943 | { |
2944 | pending_stack_adjust | |
f725a3ec | 2945 | = (combine_pending_stack_adjustment_and_call |
ce48579b | 2946 | (unadjusted_args_size, |
099e9712 | 2947 | &adjusted_args_size, |
ce48579b RH |
2948 | preferred_unit_stack_boundary)); |
2949 | do_pending_stack_adjust (); | |
2950 | } | |
0a1c58a2 | 2951 | else if (argblock == 0) |
099e9712 | 2952 | anti_adjust_stack (GEN_INT (adjusted_args_size.constant |
0a1c58a2 | 2953 | - unadjusted_args_size)); |
0a1c58a2 | 2954 | } |
ebcd0b57 JH |
2955 | /* Now that the stack is properly aligned, pops can't safely |
2956 | be deferred during the evaluation of the arguments. */ | |
2957 | NO_DEFER_POP; | |
51bbfa0c | 2958 | |
d3c12306 EB |
2959 | /* Record the maximum pushed stack space size. We need to delay |
2960 | doing it this far to take into account the optimization done | |
2961 | by combine_pending_stack_adjustment_and_call. */ | |
a11e0df4 | 2962 | if (flag_stack_usage_info |
d3c12306 EB |
2963 | && !ACCUMULATE_OUTGOING_ARGS |
2964 | && pass | |
2965 | && adjusted_args_size.var == 0) | |
2966 | { | |
2967 | int pushed = adjusted_args_size.constant + pending_stack_adjust; | |
2968 | if (pushed > current_function_pushed_stack_size) | |
2969 | current_function_pushed_stack_size = pushed; | |
2970 | } | |
2971 | ||
09e2bf48 | 2972 | funexp = rtx_for_function_call (fndecl, addr); |
51bbfa0c | 2973 | |
0a1c58a2 JL |
2974 | /* Figure out the register where the value, if any, will come back. */ |
2975 | valreg = 0; | |
28ed065e | 2976 | if (TYPE_MODE (rettype) != VOIDmode |
0a1c58a2 JL |
2977 | && ! structure_value_addr) |
2978 | { | |
2979 | if (pcc_struct_value) | |
28ed065e | 2980 | valreg = hard_function_value (build_pointer_type (rettype), |
1d636cc6 | 2981 | fndecl, NULL, (pass == 0)); |
0a1c58a2 | 2982 | else |
28ed065e | 2983 | valreg = hard_function_value (rettype, fndecl, fntype, |
1d636cc6 | 2984 | (pass == 0)); |
576c9028 KH |
2985 | |
2986 | /* If VALREG is a PARALLEL whose first member has a zero | |
2987 | offset, use that. This is for targets such as m68k that | |
2988 | return the same value in multiple places. */ | |
2989 | if (GET_CODE (valreg) == PARALLEL) | |
2990 | { | |
2991 | rtx elem = XVECEXP (valreg, 0, 0); | |
2992 | rtx where = XEXP (elem, 0); | |
2993 | rtx offset = XEXP (elem, 1); | |
2994 | if (offset == const0_rtx | |
2995 | && GET_MODE (where) == GET_MODE (valreg)) | |
2996 | valreg = where; | |
2997 | } | |
0a1c58a2 | 2998 | } |
51bbfa0c | 2999 | |
0a1c58a2 JL |
3000 | /* Precompute all register parameters. It isn't safe to compute anything |
3001 | once we have started filling any specific hard regs. */ | |
3002 | precompute_register_parameters (num_actuals, args, ®_parm_seen); | |
51bbfa0c | 3003 | |
5039610b SL |
3004 | if (CALL_EXPR_STATIC_CHAIN (exp)) |
3005 | static_chain_value = expand_normal (CALL_EXPR_STATIC_CHAIN (exp)); | |
6de9cd9a DN |
3006 | else |
3007 | static_chain_value = 0; | |
3008 | ||
f73ad30e | 3009 | #ifdef REG_PARM_STACK_SPACE |
0a1c58a2 JL |
3010 | /* Save the fixed argument area if it's part of the caller's frame and |
3011 | is clobbered by argument setup for this call. */ | |
f8a097cd | 3012 | if (ACCUMULATE_OUTGOING_ARGS && pass) |
f73ad30e JH |
3013 | save_area = save_fixed_argument_area (reg_parm_stack_space, argblock, |
3014 | &low_to_save, &high_to_save); | |
b94301c2 | 3015 | #endif |
51bbfa0c | 3016 | |
0a1c58a2 JL |
3017 | /* Now store (and compute if necessary) all non-register parms. |
3018 | These come before register parms, since they can require block-moves, | |
3019 | which could clobber the registers used for register parms. | |
3020 | Parms which have partial registers are not stored here, | |
3021 | but we do preallocate space here if they want that. */ | |
51bbfa0c | 3022 | |
0a1c58a2 | 3023 | for (i = 0; i < num_actuals; i++) |
0196c95e JJ |
3024 | { |
3025 | if (args[i].reg == 0 || args[i].pass_on_stack) | |
3026 | { | |
48810515 | 3027 | rtx_insn *before_arg = get_last_insn (); |
0196c95e | 3028 | |
ddc923b5 MP |
3029 | /* We don't allow passing huge (> 2^30 B) arguments |
3030 | by value. It would cause an overflow later on. */ | |
3031 | if (adjusted_args_size.constant | |
3032 | >= (1 << (HOST_BITS_PER_INT - 2))) | |
3033 | { | |
3034 | sorry ("passing too large argument on stack"); | |
3035 | continue; | |
3036 | } | |
3037 | ||
0196c95e JJ |
3038 | if (store_one_arg (&args[i], argblock, flags, |
3039 | adjusted_args_size.var != 0, | |
3040 | reg_parm_stack_space) | |
3041 | || (pass == 0 | |
3042 | && check_sibcall_argument_overlap (before_arg, | |
3043 | &args[i], 1))) | |
3044 | sibcall_failure = 1; | |
3045 | } | |
3046 | ||
2b1c5433 | 3047 | if (args[i].stack) |
7d810276 JJ |
3048 | call_fusage |
3049 | = gen_rtx_EXPR_LIST (TYPE_MODE (TREE_TYPE (args[i].tree_value)), | |
3050 | gen_rtx_USE (VOIDmode, args[i].stack), | |
3051 | call_fusage); | |
0196c95e | 3052 | } |
0a1c58a2 JL |
3053 | |
3054 | /* If we have a parm that is passed in registers but not in memory | |
3055 | and whose alignment does not permit a direct copy into registers, | |
3056 | make a group of pseudos that correspond to each register that we | |
3057 | will later fill. */ | |
3058 | if (STRICT_ALIGNMENT) | |
3059 | store_unaligned_arguments_into_pseudos (args, num_actuals); | |
3060 | ||
3061 | /* Now store any partially-in-registers parm. | |
3062 | This is the last place a block-move can happen. */ | |
3063 | if (reg_parm_seen) | |
3064 | for (i = 0; i < num_actuals; i++) | |
3065 | if (args[i].partial != 0 && ! args[i].pass_on_stack) | |
c67846f2 | 3066 | { |
48810515 | 3067 | rtx_insn *before_arg = get_last_insn (); |
c67846f2 | 3068 | |
4c6b3b2a JJ |
3069 | if (store_one_arg (&args[i], argblock, flags, |
3070 | adjusted_args_size.var != 0, | |
3071 | reg_parm_stack_space) | |
3072 | || (pass == 0 | |
3073 | && check_sibcall_argument_overlap (before_arg, | |
0cdca92b | 3074 | &args[i], 1))) |
c67846f2 JJ |
3075 | sibcall_failure = 1; |
3076 | } | |
51bbfa0c | 3077 | |
0a1c58a2 JL |
3078 | /* If register arguments require space on the stack and stack space |
3079 | was not preallocated, allocate stack space here for arguments | |
3080 | passed in registers. */ | |
5d059ed9 | 3081 | if (OUTGOING_REG_PARM_STACK_SPACE ((!fndecl ? fntype : TREE_TYPE (fndecl))) |
81464b2c | 3082 | && !ACCUMULATE_OUTGOING_ARGS |
f725a3ec | 3083 | && must_preallocate == 0 && reg_parm_stack_space > 0) |
0a1c58a2 | 3084 | anti_adjust_stack (GEN_INT (reg_parm_stack_space)); |
756e0e12 | 3085 | |
0a1c58a2 JL |
3086 | /* Pass the function the address in which to return a |
3087 | structure value. */ | |
3088 | if (pass != 0 && structure_value_addr && ! structure_value_addr_parm) | |
3089 | { | |
7ae4ad28 | 3090 | structure_value_addr |
5ae6cd0d | 3091 | = convert_memory_address (Pmode, structure_value_addr); |
61f71b34 | 3092 | emit_move_insn (struct_value, |
0a1c58a2 JL |
3093 | force_reg (Pmode, |
3094 | force_operand (structure_value_addr, | |
3095 | NULL_RTX))); | |
3096 | ||
f8cfc6aa | 3097 | if (REG_P (struct_value)) |
61f71b34 | 3098 | use_reg (&call_fusage, struct_value); |
0a1c58a2 | 3099 | } |
c2939b57 | 3100 | |
05e6ee93 | 3101 | after_args = get_last_insn (); |
531ca746 | 3102 | funexp = prepare_call_address (fndecl, funexp, static_chain_value, |
6de9cd9a | 3103 | &call_fusage, reg_parm_seen, pass == 0); |
51bbfa0c | 3104 | |
0cdca92b DJ |
3105 | load_register_parameters (args, num_actuals, &call_fusage, flags, |
3106 | pass == 0, &sibcall_failure); | |
f725a3ec | 3107 | |
0a1c58a2 JL |
3108 | /* Save a pointer to the last insn before the call, so that we can |
3109 | later safely search backwards to find the CALL_INSN. */ | |
3110 | before_call = get_last_insn (); | |
51bbfa0c | 3111 | |
7d167afd JJ |
3112 | /* Set up next argument register. For sibling calls on machines |
3113 | with register windows this should be the incoming register. */ | |
7d167afd | 3114 | if (pass == 0) |
d5cc9181 | 3115 | next_arg_reg = targetm.calls.function_incoming_arg (args_so_far, |
3c07301f NF |
3116 | VOIDmode, |
3117 | void_type_node, | |
3118 | true); | |
7d167afd | 3119 | else |
d5cc9181 | 3120 | next_arg_reg = targetm.calls.function_arg (args_so_far, |
3c07301f NF |
3121 | VOIDmode, void_type_node, |
3122 | true); | |
7d167afd | 3123 | |
e384e6b5 BS |
3124 | if (pass == 1 && (return_flags & ERF_RETURNS_ARG)) |
3125 | { | |
3126 | int arg_nr = return_flags & ERF_RETURN_ARG_MASK; | |
3d9684ae | 3127 | arg_nr = num_actuals - arg_nr - 1; |
b3681f13 TV |
3128 | if (arg_nr >= 0 |
3129 | && arg_nr < num_actuals | |
3130 | && args[arg_nr].reg | |
e384e6b5 BS |
3131 | && valreg |
3132 | && REG_P (valreg) | |
3133 | && GET_MODE (args[arg_nr].reg) == GET_MODE (valreg)) | |
3134 | call_fusage | |
3135 | = gen_rtx_EXPR_LIST (TYPE_MODE (TREE_TYPE (args[arg_nr].tree_value)), | |
3136 | gen_rtx_SET (VOIDmode, valreg, args[arg_nr].reg), | |
3137 | call_fusage); | |
3138 | } | |
0a1c58a2 JL |
3139 | /* All arguments and registers used for the call must be set up by |
3140 | now! */ | |
3141 | ||
ce48579b | 3142 | /* Stack must be properly aligned now. */ |
366de0ce NS |
3143 | gcc_assert (!pass |
3144 | || !(stack_pointer_delta % preferred_unit_stack_boundary)); | |
ebcd0b57 | 3145 | |
0a1c58a2 | 3146 | /* Generate the actual call instruction. */ |
6de9cd9a | 3147 | emit_call_1 (funexp, exp, fndecl, funtype, unadjusted_args_size, |
099e9712 | 3148 | adjusted_args_size.constant, struct_value_size, |
7d167afd | 3149 | next_arg_reg, valreg, old_inhibit_defer_pop, call_fusage, |
d5cc9181 | 3150 | flags, args_so_far); |
0a1c58a2 | 3151 | |
4f660b15 RO |
3152 | if (flag_use_caller_save) |
3153 | { | |
48810515 DM |
3154 | rtx_call_insn *last; |
3155 | rtx datum = NULL_RTX; | |
4f660b15 RO |
3156 | if (fndecl != NULL_TREE) |
3157 | { | |
3158 | datum = XEXP (DECL_RTL (fndecl), 0); | |
3159 | gcc_assert (datum != NULL_RTX | |
3160 | && GET_CODE (datum) == SYMBOL_REF); | |
3161 | } | |
3162 | last = last_call_insn (); | |
3163 | add_reg_note (last, REG_CALL_DECL, datum); | |
3164 | } | |
3165 | ||
05e6ee93 MM |
3166 | /* If the call setup or the call itself overlaps with anything |
3167 | of the argument setup we probably clobbered our call address. | |
3168 | In that case we can't do sibcalls. */ | |
3169 | if (pass == 0 | |
3170 | && check_sibcall_argument_overlap (after_args, 0, 0)) | |
3171 | sibcall_failure = 1; | |
3172 | ||
bef5d8b6 RS |
3173 | /* If a non-BLKmode value is returned at the most significant end |
3174 | of a register, shift the register right by the appropriate amount | |
3175 | and update VALREG accordingly. BLKmode values are handled by the | |
3176 | group load/store machinery below. */ | |
3177 | if (!structure_value_addr | |
3178 | && !pcc_struct_value | |
66de4d7c | 3179 | && TYPE_MODE (rettype) != VOIDmode |
28ed065e | 3180 | && TYPE_MODE (rettype) != BLKmode |
66de4d7c | 3181 | && REG_P (valreg) |
28ed065e | 3182 | && targetm.calls.return_in_msb (rettype)) |
bef5d8b6 | 3183 | { |
28ed065e | 3184 | if (shift_return_value (TYPE_MODE (rettype), false, valreg)) |
bef5d8b6 | 3185 | sibcall_failure = 1; |
28ed065e | 3186 | valreg = gen_rtx_REG (TYPE_MODE (rettype), REGNO (valreg)); |
bef5d8b6 RS |
3187 | } |
3188 | ||
84b8030f | 3189 | if (pass && (flags & ECF_MALLOC)) |
0a1c58a2 JL |
3190 | { |
3191 | rtx temp = gen_reg_rtx (GET_MODE (valreg)); | |
48810515 | 3192 | rtx_insn *last, *insns; |
0a1c58a2 | 3193 | |
f725a3ec | 3194 | /* The return value from a malloc-like function is a pointer. */ |
28ed065e | 3195 | if (TREE_CODE (rettype) == POINTER_TYPE) |
d154bfa2 | 3196 | mark_reg_pointer (temp, MALLOC_ABI_ALIGNMENT); |
0a1c58a2 JL |
3197 | |
3198 | emit_move_insn (temp, valreg); | |
3199 | ||
3200 | /* The return value from a malloc-like function can not alias | |
3201 | anything else. */ | |
3202 | last = get_last_insn (); | |
65c5f2a6 | 3203 | add_reg_note (last, REG_NOALIAS, temp); |
0a1c58a2 JL |
3204 | |
3205 | /* Write out the sequence. */ | |
3206 | insns = get_insns (); | |
3207 | end_sequence (); | |
2f937369 | 3208 | emit_insn (insns); |
0a1c58a2 JL |
3209 | valreg = temp; |
3210 | } | |
51bbfa0c | 3211 | |
6fb5fa3c DB |
3212 | /* For calls to `setjmp', etc., inform |
3213 | function.c:setjmp_warnings that it should complain if | |
3214 | nonvolatile values are live. For functions that cannot | |
3215 | return, inform flow that control does not fall through. */ | |
51bbfa0c | 3216 | |
6e14af16 | 3217 | if ((flags & ECF_NORETURN) || pass == 0) |
c2939b57 | 3218 | { |
570a98eb | 3219 | /* The barrier must be emitted |
0a1c58a2 JL |
3220 | immediately after the CALL_INSN. Some ports emit more |
3221 | than just a CALL_INSN above, so we must search for it here. */ | |
51bbfa0c | 3222 | |
48810515 | 3223 | rtx_insn *last = get_last_insn (); |
4b4bf941 | 3224 | while (!CALL_P (last)) |
0a1c58a2 JL |
3225 | { |
3226 | last = PREV_INSN (last); | |
3227 | /* There was no CALL_INSN? */ | |
366de0ce | 3228 | gcc_assert (last != before_call); |
0a1c58a2 | 3229 | } |
51bbfa0c | 3230 | |
570a98eb | 3231 | emit_barrier_after (last); |
8af61113 | 3232 | |
f451eeef JS |
3233 | /* Stack adjustments after a noreturn call are dead code. |
3234 | However when NO_DEFER_POP is in effect, we must preserve | |
3235 | stack_pointer_delta. */ | |
3236 | if (inhibit_defer_pop == 0) | |
3237 | { | |
3238 | stack_pointer_delta = old_stack_allocated; | |
3239 | pending_stack_adjust = 0; | |
3240 | } | |
0a1c58a2 | 3241 | } |
51bbfa0c | 3242 | |
0a1c58a2 | 3243 | /* If value type not void, return an rtx for the value. */ |
51bbfa0c | 3244 | |
28ed065e | 3245 | if (TYPE_MODE (rettype) == VOIDmode |
0a1c58a2 | 3246 | || ignore) |
b5cd4ed4 | 3247 | target = const0_rtx; |
0a1c58a2 JL |
3248 | else if (structure_value_addr) |
3249 | { | |
3c0cb5de | 3250 | if (target == 0 || !MEM_P (target)) |
0a1c58a2 | 3251 | { |
3bdf5ad1 | 3252 | target |
28ed065e MM |
3253 | = gen_rtx_MEM (TYPE_MODE (rettype), |
3254 | memory_address (TYPE_MODE (rettype), | |
3bdf5ad1 | 3255 | structure_value_addr)); |
28ed065e | 3256 | set_mem_attributes (target, rettype, 1); |
0a1c58a2 JL |
3257 | } |
3258 | } | |
3259 | else if (pcc_struct_value) | |
cacbd532 | 3260 | { |
0a1c58a2 JL |
3261 | /* This is the special C++ case where we need to |
3262 | know what the true target was. We take care to | |
3263 | never use this value more than once in one expression. */ | |
28ed065e | 3264 | target = gen_rtx_MEM (TYPE_MODE (rettype), |
0a1c58a2 | 3265 | copy_to_reg (valreg)); |
28ed065e | 3266 | set_mem_attributes (target, rettype, 1); |
cacbd532 | 3267 | } |
0a1c58a2 JL |
3268 | /* Handle calls that return values in multiple non-contiguous locations. |
3269 | The Irix 6 ABI has examples of this. */ | |
3270 | else if (GET_CODE (valreg) == PARALLEL) | |
3271 | { | |
6de9cd9a | 3272 | if (target == 0) |
5ef0b50d | 3273 | target = emit_group_move_into_temps (valreg); |
1d1b7dc4 RS |
3274 | else if (rtx_equal_p (target, valreg)) |
3275 | ; | |
3276 | else if (GET_CODE (target) == PARALLEL) | |
3277 | /* Handle the result of a emit_group_move_into_temps | |
3278 | call in the previous pass. */ | |
3279 | emit_group_move (target, valreg); | |
3280 | else | |
28ed065e MM |
3281 | emit_group_store (target, valreg, rettype, |
3282 | int_size_in_bytes (rettype)); | |
0a1c58a2 JL |
3283 | } |
3284 | else if (target | |
28ed065e | 3285 | && GET_MODE (target) == TYPE_MODE (rettype) |
0a1c58a2 JL |
3286 | && GET_MODE (target) == GET_MODE (valreg)) |
3287 | { | |
51caaefe EB |
3288 | bool may_overlap = false; |
3289 | ||
f2d18690 KK |
3290 | /* We have to copy a return value in a CLASS_LIKELY_SPILLED hard |
3291 | reg to a plain register. */ | |
3fb30019 RS |
3292 | if (!REG_P (target) || HARD_REGISTER_P (target)) |
3293 | valreg = avoid_likely_spilled_reg (valreg); | |
f2d18690 | 3294 | |
51caaefe EB |
3295 | /* If TARGET is a MEM in the argument area, and we have |
3296 | saved part of the argument area, then we can't store | |
3297 | directly into TARGET as it may get overwritten when we | |
3298 | restore the argument save area below. Don't work too | |
3299 | hard though and simply force TARGET to a register if it | |
3300 | is a MEM; the optimizer is quite likely to sort it out. */ | |
3301 | if (ACCUMULATE_OUTGOING_ARGS && pass && MEM_P (target)) | |
3302 | for (i = 0; i < num_actuals; i++) | |
3303 | if (args[i].save_area) | |
3304 | { | |
3305 | may_overlap = true; | |
3306 | break; | |
3307 | } | |
0219237c | 3308 | |
51caaefe EB |
3309 | if (may_overlap) |
3310 | target = copy_to_reg (valreg); | |
3311 | else | |
3312 | { | |
3313 | /* TARGET and VALREG cannot be equal at this point | |
3314 | because the latter would not have | |
3315 | REG_FUNCTION_VALUE_P true, while the former would if | |
3316 | it were referring to the same register. | |
3317 | ||
3318 | If they refer to the same register, this move will be | |
3319 | a no-op, except when function inlining is being | |
3320 | done. */ | |
3321 | emit_move_insn (target, valreg); | |
3322 | ||
3323 | /* If we are setting a MEM, this code must be executed. | |
3324 | Since it is emitted after the call insn, sibcall | |
3325 | optimization cannot be performed in that case. */ | |
3326 | if (MEM_P (target)) | |
3327 | sibcall_failure = 1; | |
3328 | } | |
0a1c58a2 | 3329 | } |
0a1c58a2 | 3330 | else |
3fb30019 | 3331 | target = copy_to_reg (avoid_likely_spilled_reg (valreg)); |
51bbfa0c | 3332 | |
cde0f3fd PB |
3333 | /* If we promoted this return value, make the proper SUBREG. |
3334 | TARGET might be const0_rtx here, so be careful. */ | |
3335 | if (REG_P (target) | |
28ed065e MM |
3336 | && TYPE_MODE (rettype) != BLKmode |
3337 | && GET_MODE (target) != TYPE_MODE (rettype)) | |
61f71b34 | 3338 | { |
28ed065e | 3339 | tree type = rettype; |
cde0f3fd PB |
3340 | int unsignedp = TYPE_UNSIGNED (type); |
3341 | int offset = 0; | |
3342 | enum machine_mode pmode; | |
3343 | ||
3344 | /* Ensure we promote as expected, and get the new unsignedness. */ | |
3345 | pmode = promote_function_mode (type, TYPE_MODE (type), &unsignedp, | |
3346 | funtype, 1); | |
3347 | gcc_assert (GET_MODE (target) == pmode); | |
3348 | ||
3349 | if ((WORDS_BIG_ENDIAN || BYTES_BIG_ENDIAN) | |
3350 | && (GET_MODE_SIZE (GET_MODE (target)) | |
3351 | > GET_MODE_SIZE (TYPE_MODE (type)))) | |
366de0ce | 3352 | { |
cde0f3fd PB |
3353 | offset = GET_MODE_SIZE (GET_MODE (target)) |
3354 | - GET_MODE_SIZE (TYPE_MODE (type)); | |
3355 | if (! BYTES_BIG_ENDIAN) | |
3356 | offset = (offset / UNITS_PER_WORD) * UNITS_PER_WORD; | |
3357 | else if (! WORDS_BIG_ENDIAN) | |
3358 | offset %= UNITS_PER_WORD; | |
366de0ce | 3359 | } |
cde0f3fd PB |
3360 | |
3361 | target = gen_rtx_SUBREG (TYPE_MODE (type), target, offset); | |
3362 | SUBREG_PROMOTED_VAR_P (target) = 1; | |
362d42dc | 3363 | SUBREG_PROMOTED_SET (target, unsignedp); |
61f71b34 | 3364 | } |
84b55618 | 3365 | |
0a1c58a2 JL |
3366 | /* If size of args is variable or this was a constructor call for a stack |
3367 | argument, restore saved stack-pointer value. */ | |
51bbfa0c | 3368 | |
9dd9bf80 | 3369 | if (old_stack_level) |
0a1c58a2 | 3370 | { |
48810515 | 3371 | rtx_insn *prev = get_last_insn (); |
9a08d230 | 3372 | |
9eac0f2a | 3373 | emit_stack_restore (SAVE_BLOCK, old_stack_level); |
38afb23f | 3374 | stack_pointer_delta = old_stack_pointer_delta; |
9a08d230 | 3375 | |
faf7a23d | 3376 | fixup_args_size_notes (prev, get_last_insn (), stack_pointer_delta); |
9a08d230 | 3377 | |
0a1c58a2 | 3378 | pending_stack_adjust = old_pending_adj; |
d25cee4d | 3379 | old_stack_allocated = stack_pointer_delta - pending_stack_adjust; |
0a1c58a2 JL |
3380 | stack_arg_under_construction = old_stack_arg_under_construction; |
3381 | highest_outgoing_arg_in_use = initial_highest_arg_in_use; | |
3382 | stack_usage_map = initial_stack_usage_map; | |
0a1c58a2 JL |
3383 | sibcall_failure = 1; |
3384 | } | |
f8a097cd | 3385 | else if (ACCUMULATE_OUTGOING_ARGS && pass) |
0a1c58a2 | 3386 | { |
51bbfa0c | 3387 | #ifdef REG_PARM_STACK_SPACE |
0a1c58a2 | 3388 | if (save_area) |
b820d2b8 AM |
3389 | restore_fixed_argument_area (save_area, argblock, |
3390 | high_to_save, low_to_save); | |
b94301c2 | 3391 | #endif |
51bbfa0c | 3392 | |
0a1c58a2 JL |
3393 | /* If we saved any argument areas, restore them. */ |
3394 | for (i = 0; i < num_actuals; i++) | |
3395 | if (args[i].save_area) | |
3396 | { | |
3397 | enum machine_mode save_mode = GET_MODE (args[i].save_area); | |
3398 | rtx stack_area | |
3399 | = gen_rtx_MEM (save_mode, | |
3400 | memory_address (save_mode, | |
3401 | XEXP (args[i].stack_slot, 0))); | |
3402 | ||
3403 | if (save_mode != BLKmode) | |
3404 | emit_move_insn (stack_area, args[i].save_area); | |
3405 | else | |
44bb111a | 3406 | emit_block_move (stack_area, args[i].save_area, |
e7949876 | 3407 | GEN_INT (args[i].locate.size.constant), |
44bb111a | 3408 | BLOCK_OP_CALL_PARM); |
0a1c58a2 | 3409 | } |
51bbfa0c | 3410 | |
0a1c58a2 JL |
3411 | highest_outgoing_arg_in_use = initial_highest_arg_in_use; |
3412 | stack_usage_map = initial_stack_usage_map; | |
3413 | } | |
51bbfa0c | 3414 | |
f725a3ec | 3415 | /* If this was alloca, record the new stack level for nonlocal gotos. |
0a1c58a2 JL |
3416 | Check for the handler slots since we might not have a save area |
3417 | for non-local gotos. */ | |
59257ff7 | 3418 | |
6de9cd9a DN |
3419 | if ((flags & ECF_MAY_BE_ALLOCA) && cfun->nonlocal_goto_save_area != 0) |
3420 | update_nonlocal_goto_save_area (); | |
51bbfa0c | 3421 | |
0a1c58a2 JL |
3422 | /* Free up storage we no longer need. */ |
3423 | for (i = 0; i < num_actuals; ++i) | |
04695783 | 3424 | free (args[i].aligned_regs); |
0a1c58a2 JL |
3425 | |
3426 | insns = get_insns (); | |
3427 | end_sequence (); | |
3428 | ||
3429 | if (pass == 0) | |
3430 | { | |
3431 | tail_call_insns = insns; | |
3432 | ||
0a1c58a2 JL |
3433 | /* Restore the pending stack adjustment now that we have |
3434 | finished generating the sibling call sequence. */ | |
1503a7ec | 3435 | |
7f2f0a01 | 3436 | restore_pending_stack_adjust (&save); |
099e9712 JH |
3437 | |
3438 | /* Prepare arg structure for next iteration. */ | |
f725a3ec | 3439 | for (i = 0; i < num_actuals; i++) |
099e9712 JH |
3440 | { |
3441 | args[i].value = 0; | |
3442 | args[i].aligned_regs = 0; | |
3443 | args[i].stack = 0; | |
3444 | } | |
c67846f2 JJ |
3445 | |
3446 | sbitmap_free (stored_args_map); | |
48810515 | 3447 | internal_arg_pointer_exp_state.scan_start = NULL; |
9771b263 | 3448 | internal_arg_pointer_exp_state.cache.release (); |
0a1c58a2 JL |
3449 | } |
3450 | else | |
38afb23f OH |
3451 | { |
3452 | normal_call_insns = insns; | |
3453 | ||
3454 | /* Verify that we've deallocated all the stack we used. */ | |
6e14af16 | 3455 | gcc_assert ((flags & ECF_NORETURN) |
366de0ce NS |
3456 | || (old_stack_allocated |
3457 | == stack_pointer_delta - pending_stack_adjust)); | |
38afb23f | 3458 | } |
fadb729c JJ |
3459 | |
3460 | /* If something prevents making this a sibling call, | |
3461 | zero out the sequence. */ | |
3462 | if (sibcall_failure) | |
48810515 | 3463 | tail_call_insns = NULL; |
6de9cd9a DN |
3464 | else |
3465 | break; | |
0a1c58a2 JL |
3466 | } |
3467 | ||
1ea7e6ad | 3468 | /* If tail call production succeeded, we need to remove REG_EQUIV notes on |
6de9cd9a DN |
3469 | arguments too, as argument area is now clobbered by the call. */ |
3470 | if (tail_call_insns) | |
0a1c58a2 | 3471 | { |
6de9cd9a | 3472 | emit_insn (tail_call_insns); |
e3b5732b | 3473 | crtl->tail_call_emit = true; |
0a1c58a2 JL |
3474 | } |
3475 | else | |
2f937369 | 3476 | emit_insn (normal_call_insns); |
51bbfa0c | 3477 | |
0a1c58a2 | 3478 | currently_expanding_call--; |
8e6a59fe | 3479 | |
04695783 | 3480 | free (stack_usage_map_buf); |
d9725c41 | 3481 | |
51bbfa0c RS |
3482 | return target; |
3483 | } | |
ded9bf77 | 3484 | |
6de9cd9a DN |
3485 | /* A sibling call sequence invalidates any REG_EQUIV notes made for |
3486 | this function's incoming arguments. | |
3487 | ||
3488 | At the start of RTL generation we know the only REG_EQUIV notes | |
29d51cdb SB |
3489 | in the rtl chain are those for incoming arguments, so we can look |
3490 | for REG_EQUIV notes between the start of the function and the | |
3491 | NOTE_INSN_FUNCTION_BEG. | |
6de9cd9a DN |
3492 | |
3493 | This is (slight) overkill. We could keep track of the highest | |
3494 | argument we clobber and be more selective in removing notes, but it | |
3495 | does not seem to be worth the effort. */ | |
29d51cdb | 3496 | |
6de9cd9a DN |
3497 | void |
3498 | fixup_tail_calls (void) | |
3499 | { | |
48810515 | 3500 | rtx_insn *insn; |
29d51cdb SB |
3501 | |
3502 | for (insn = get_insns (); insn; insn = NEXT_INSN (insn)) | |
3503 | { | |
a31830a7 SB |
3504 | rtx note; |
3505 | ||
29d51cdb SB |
3506 | /* There are never REG_EQUIV notes for the incoming arguments |
3507 | after the NOTE_INSN_FUNCTION_BEG note, so stop if we see it. */ | |
3508 | if (NOTE_P (insn) | |
a38e7aa5 | 3509 | && NOTE_KIND (insn) == NOTE_INSN_FUNCTION_BEG) |
29d51cdb SB |
3510 | break; |
3511 | ||
a31830a7 SB |
3512 | note = find_reg_note (insn, REG_EQUIV, 0); |
3513 | if (note) | |
3514 | remove_note (insn, note); | |
3515 | note = find_reg_note (insn, REG_EQUIV, 0); | |
3516 | gcc_assert (!note); | |
29d51cdb | 3517 | } |
6de9cd9a DN |
3518 | } |
3519 | ||
ded9bf77 AH |
3520 | /* Traverse a list of TYPES and expand all complex types into their |
3521 | components. */ | |
2f2b4a02 | 3522 | static tree |
ded9bf77 AH |
3523 | split_complex_types (tree types) |
3524 | { | |
3525 | tree p; | |
3526 | ||
42ba5130 RH |
3527 | /* Before allocating memory, check for the common case of no complex. */ |
3528 | for (p = types; p; p = TREE_CHAIN (p)) | |
3529 | { | |
3530 | tree type = TREE_VALUE (p); | |
3531 | if (TREE_CODE (type) == COMPLEX_TYPE | |
3532 | && targetm.calls.split_complex_arg (type)) | |
c22cacf3 | 3533 | goto found; |
42ba5130 RH |
3534 | } |
3535 | return types; | |
3536 | ||
3537 | found: | |
ded9bf77 AH |
3538 | types = copy_list (types); |
3539 | ||
3540 | for (p = types; p; p = TREE_CHAIN (p)) | |
3541 | { | |
3542 | tree complex_type = TREE_VALUE (p); | |
3543 | ||
42ba5130 RH |
3544 | if (TREE_CODE (complex_type) == COMPLEX_TYPE |
3545 | && targetm.calls.split_complex_arg (complex_type)) | |
ded9bf77 AH |
3546 | { |
3547 | tree next, imag; | |
3548 | ||
3549 | /* Rewrite complex type with component type. */ | |
3550 | TREE_VALUE (p) = TREE_TYPE (complex_type); | |
3551 | next = TREE_CHAIN (p); | |
3552 | ||
3553 | /* Add another component type for the imaginary part. */ | |
3554 | imag = build_tree_list (NULL_TREE, TREE_VALUE (p)); | |
3555 | TREE_CHAIN (p) = imag; | |
3556 | TREE_CHAIN (imag) = next; | |
3557 | ||
3558 | /* Skip the newly created node. */ | |
3559 | p = TREE_CHAIN (p); | |
3560 | } | |
3561 | } | |
3562 | ||
3563 | return types; | |
3564 | } | |
51bbfa0c | 3565 | \f |
de76b467 | 3566 | /* Output a library call to function FUN (a SYMBOL_REF rtx). |
f725a3ec | 3567 | The RETVAL parameter specifies whether return value needs to be saved, other |
0407c02b | 3568 | parameters are documented in the emit_library_call function below. */ |
8ac61af7 | 3569 | |
de76b467 | 3570 | static rtx |
d329e058 AJ |
3571 | emit_library_call_value_1 (int retval, rtx orgfun, rtx value, |
3572 | enum libcall_type fn_type, | |
3573 | enum machine_mode outmode, int nargs, va_list p) | |
43bc5f13 | 3574 | { |
3c0fca12 RH |
3575 | /* Total size in bytes of all the stack-parms scanned so far. */ |
3576 | struct args_size args_size; | |
3577 | /* Size of arguments before any adjustments (such as rounding). */ | |
3578 | struct args_size original_args_size; | |
b3694847 | 3579 | int argnum; |
3c0fca12 | 3580 | rtx fun; |
81464b2c KT |
3581 | /* Todo, choose the correct decl type of orgfun. Sadly this information |
3582 | isn't present here, so we default to native calling abi here. */ | |
033df0b9 | 3583 | tree fndecl ATTRIBUTE_UNUSED = NULL_TREE; /* library calls default to host calling abi ? */ |
5d059ed9 | 3584 | tree fntype ATTRIBUTE_UNUSED = NULL_TREE; /* library calls default to host calling abi ? */ |
3c0fca12 | 3585 | int count; |
3c0fca12 | 3586 | rtx argblock = 0; |
d5cc9181 JR |
3587 | CUMULATIVE_ARGS args_so_far_v; |
3588 | cumulative_args_t args_so_far; | |
f725a3ec KH |
3589 | struct arg |
3590 | { | |
3591 | rtx value; | |
3592 | enum machine_mode mode; | |
3593 | rtx reg; | |
3594 | int partial; | |
e7949876 | 3595 | struct locate_and_pad_arg_data locate; |
f725a3ec KH |
3596 | rtx save_area; |
3597 | }; | |
3c0fca12 RH |
3598 | struct arg *argvec; |
3599 | int old_inhibit_defer_pop = inhibit_defer_pop; | |
3600 | rtx call_fusage = 0; | |
3601 | rtx mem_value = 0; | |
5591ee6f | 3602 | rtx valreg; |
3c0fca12 RH |
3603 | int pcc_struct_value = 0; |
3604 | int struct_value_size = 0; | |
52a11cbf | 3605 | int flags; |
3c0fca12 | 3606 | int reg_parm_stack_space = 0; |
3c0fca12 | 3607 | int needed; |
48810515 | 3608 | rtx_insn *before_call; |
b0c48229 | 3609 | tree tfom; /* type_for_mode (outmode, 0) */ |
3c0fca12 | 3610 | |
f73ad30e | 3611 | #ifdef REG_PARM_STACK_SPACE |
3c0fca12 RH |
3612 | /* Define the boundary of the register parm stack space that needs to be |
3613 | save, if any. */ | |
726a989a | 3614 | int low_to_save = 0, high_to_save = 0; |
f725a3ec | 3615 | rtx save_area = 0; /* Place that it is saved. */ |
3c0fca12 RH |
3616 | #endif |
3617 | ||
3c0fca12 RH |
3618 | /* Size of the stack reserved for parameter registers. */ |
3619 | int initial_highest_arg_in_use = highest_outgoing_arg_in_use; | |
3620 | char *initial_stack_usage_map = stack_usage_map; | |
d9725c41 | 3621 | char *stack_usage_map_buf = NULL; |
3c0fca12 | 3622 | |
61f71b34 DD |
3623 | rtx struct_value = targetm.calls.struct_value_rtx (0, 0); |
3624 | ||
3c0fca12 | 3625 | #ifdef REG_PARM_STACK_SPACE |
3c0fca12 | 3626 | reg_parm_stack_space = REG_PARM_STACK_SPACE ((tree) 0); |
3c0fca12 RH |
3627 | #endif |
3628 | ||
9555a122 | 3629 | /* By default, library functions can not throw. */ |
52a11cbf RH |
3630 | flags = ECF_NOTHROW; |
3631 | ||
9555a122 RH |
3632 | switch (fn_type) |
3633 | { | |
3634 | case LCT_NORMAL: | |
53d4257f | 3635 | break; |
9555a122 | 3636 | case LCT_CONST: |
53d4257f JH |
3637 | flags |= ECF_CONST; |
3638 | break; | |
9555a122 | 3639 | case LCT_PURE: |
53d4257f | 3640 | flags |= ECF_PURE; |
9555a122 | 3641 | break; |
9555a122 RH |
3642 | case LCT_NORETURN: |
3643 | flags |= ECF_NORETURN; | |
3644 | break; | |
3645 | case LCT_THROW: | |
3646 | flags = ECF_NORETURN; | |
3647 | break; | |
9defc9b7 RH |
3648 | case LCT_RETURNS_TWICE: |
3649 | flags = ECF_RETURNS_TWICE; | |
3650 | break; | |
9555a122 | 3651 | } |
3c0fca12 RH |
3652 | fun = orgfun; |
3653 | ||
3c0fca12 RH |
3654 | /* Ensure current function's preferred stack boundary is at least |
3655 | what we need. */ | |
cb91fab0 JH |
3656 | if (crtl->preferred_stack_boundary < PREFERRED_STACK_BOUNDARY) |
3657 | crtl->preferred_stack_boundary = PREFERRED_STACK_BOUNDARY; | |
3c0fca12 RH |
3658 | |
3659 | /* If this kind of value comes back in memory, | |
3660 | decide where in memory it should come back. */ | |
b0c48229 | 3661 | if (outmode != VOIDmode) |
3c0fca12 | 3662 | { |
ae2bcd98 | 3663 | tfom = lang_hooks.types.type_for_mode (outmode, 0); |
61f71b34 | 3664 | if (aggregate_value_p (tfom, 0)) |
b0c48229 | 3665 | { |
3c0fca12 | 3666 | #ifdef PCC_STATIC_STRUCT_RETURN |
b0c48229 | 3667 | rtx pointer_reg |
1d636cc6 | 3668 | = hard_function_value (build_pointer_type (tfom), 0, 0, 0); |
b0c48229 NB |
3669 | mem_value = gen_rtx_MEM (outmode, pointer_reg); |
3670 | pcc_struct_value = 1; | |
3671 | if (value == 0) | |
3672 | value = gen_reg_rtx (outmode); | |
3c0fca12 | 3673 | #else /* not PCC_STATIC_STRUCT_RETURN */ |
b0c48229 | 3674 | struct_value_size = GET_MODE_SIZE (outmode); |
3c0cb5de | 3675 | if (value != 0 && MEM_P (value)) |
b0c48229 NB |
3676 | mem_value = value; |
3677 | else | |
9474e8ab | 3678 | mem_value = assign_temp (tfom, 1, 1); |
3c0fca12 | 3679 | #endif |
b0c48229 | 3680 | /* This call returns a big structure. */ |
84b8030f | 3681 | flags &= ~(ECF_CONST | ECF_PURE | ECF_LOOPING_CONST_OR_PURE); |
b0c48229 | 3682 | } |
3c0fca12 | 3683 | } |
b0c48229 NB |
3684 | else |
3685 | tfom = void_type_node; | |
3c0fca12 RH |
3686 | |
3687 | /* ??? Unfinished: must pass the memory address as an argument. */ | |
3688 | ||
3689 | /* Copy all the libcall-arguments out of the varargs data | |
3690 | and into a vector ARGVEC. | |
3691 | ||
3692 | Compute how to pass each argument. We only support a very small subset | |
3693 | of the full argument passing conventions to limit complexity here since | |
3694 | library functions shouldn't have many args. */ | |
3695 | ||
f883e0a7 | 3696 | argvec = XALLOCAVEC (struct arg, nargs + 1); |
703ad42b | 3697 | memset (argvec, 0, (nargs + 1) * sizeof (struct arg)); |
3c0fca12 | 3698 | |
97fc4caf | 3699 | #ifdef INIT_CUMULATIVE_LIBCALL_ARGS |
d5cc9181 | 3700 | INIT_CUMULATIVE_LIBCALL_ARGS (args_so_far_v, outmode, fun); |
97fc4caf | 3701 | #else |
d5cc9181 | 3702 | INIT_CUMULATIVE_ARGS (args_so_far_v, NULL_TREE, fun, 0, nargs); |
97fc4caf | 3703 | #endif |
d5cc9181 | 3704 | args_so_far = pack_cumulative_args (&args_so_far_v); |
3c0fca12 RH |
3705 | |
3706 | args_size.constant = 0; | |
3707 | args_size.var = 0; | |
3708 | ||
3709 | count = 0; | |
3710 | ||
3711 | push_temp_slots (); | |
3712 | ||
3713 | /* If there's a structure value address to be passed, | |
3714 | either pass it in the special place, or pass it as an extra argument. */ | |
61f71b34 | 3715 | if (mem_value && struct_value == 0 && ! pcc_struct_value) |
3c0fca12 RH |
3716 | { |
3717 | rtx addr = XEXP (mem_value, 0); | |
c22cacf3 | 3718 | |
3c0fca12 RH |
3719 | nargs++; |
3720 | ||
ee88d9aa MK |
3721 | /* Make sure it is a reasonable operand for a move or push insn. */ |
3722 | if (!REG_P (addr) && !MEM_P (addr) | |
1a627b35 RS |
3723 | && !(CONSTANT_P (addr) |
3724 | && targetm.legitimate_constant_p (Pmode, addr))) | |
ee88d9aa MK |
3725 | addr = force_operand (addr, NULL_RTX); |
3726 | ||
3c0fca12 RH |
3727 | argvec[count].value = addr; |
3728 | argvec[count].mode = Pmode; | |
3729 | argvec[count].partial = 0; | |
3730 | ||
d5cc9181 | 3731 | argvec[count].reg = targetm.calls.function_arg (args_so_far, |
3c07301f | 3732 | Pmode, NULL_TREE, true); |
d5cc9181 | 3733 | gcc_assert (targetm.calls.arg_partial_bytes (args_so_far, Pmode, |
78a52f11 | 3734 | NULL_TREE, 1) == 0); |
3c0fca12 RH |
3735 | |
3736 | locate_and_pad_parm (Pmode, NULL_TREE, | |
a4d5044f | 3737 | #ifdef STACK_PARMS_IN_REG_PARM_AREA |
c22cacf3 | 3738 | 1, |
a4d5044f CM |
3739 | #else |
3740 | argvec[count].reg != 0, | |
3741 | #endif | |
2e4ceca5 UW |
3742 | reg_parm_stack_space, 0, |
3743 | NULL_TREE, &args_size, &argvec[count].locate); | |
3c0fca12 | 3744 | |
3c0fca12 RH |
3745 | if (argvec[count].reg == 0 || argvec[count].partial != 0 |
3746 | || reg_parm_stack_space > 0) | |
e7949876 | 3747 | args_size.constant += argvec[count].locate.size.constant; |
3c0fca12 | 3748 | |
d5cc9181 | 3749 | targetm.calls.function_arg_advance (args_so_far, Pmode, (tree) 0, true); |
3c0fca12 RH |
3750 | |
3751 | count++; | |
3752 | } | |
3753 | ||
3754 | for (; count < nargs; count++) | |
3755 | { | |
3756 | rtx val = va_arg (p, rtx); | |
72b5577d | 3757 | enum machine_mode mode = (enum machine_mode) va_arg (p, int); |
5e617be8 | 3758 | int unsigned_p = 0; |
3c0fca12 RH |
3759 | |
3760 | /* We cannot convert the arg value to the mode the library wants here; | |
3761 | must do it earlier where we know the signedness of the arg. */ | |
366de0ce NS |
3762 | gcc_assert (mode != BLKmode |
3763 | && (GET_MODE (val) == mode || GET_MODE (val) == VOIDmode)); | |
3c0fca12 | 3764 | |
ee88d9aa MK |
3765 | /* Make sure it is a reasonable operand for a move or push insn. */ |
3766 | if (!REG_P (val) && !MEM_P (val) | |
1a627b35 | 3767 | && !(CONSTANT_P (val) && targetm.legitimate_constant_p (mode, val))) |
ee88d9aa MK |
3768 | val = force_operand (val, NULL_RTX); |
3769 | ||
d5cc9181 | 3770 | if (pass_by_reference (&args_so_far_v, mode, NULL_TREE, 1)) |
3c0fca12 | 3771 | { |
f474c6f8 | 3772 | rtx slot; |
6cdd5672 | 3773 | int must_copy |
d5cc9181 | 3774 | = !reference_callee_copied (&args_so_far_v, mode, NULL_TREE, 1); |
f474c6f8 | 3775 | |
becfd6e5 KZ |
3776 | /* If this was a CONST function, it is now PURE since it now |
3777 | reads memory. */ | |
99a32567 DM |
3778 | if (flags & ECF_CONST) |
3779 | { | |
3780 | flags &= ~ECF_CONST; | |
3781 | flags |= ECF_PURE; | |
3782 | } | |
3783 | ||
e0c68ce9 | 3784 | if (MEM_P (val) && !must_copy) |
c4b9a87e ER |
3785 | { |
3786 | tree val_expr = MEM_EXPR (val); | |
3787 | if (val_expr) | |
3788 | mark_addressable (val_expr); | |
3789 | slot = val; | |
3790 | } | |
9969aaf6 | 3791 | else |
f474c6f8 | 3792 | { |
ae2bcd98 | 3793 | slot = assign_temp (lang_hooks.types.type_for_mode (mode, 0), |
9474e8ab | 3794 | 1, 1); |
f474c6f8 AO |
3795 | emit_move_insn (slot, val); |
3796 | } | |
1da68f56 | 3797 | |
6b5273c3 AO |
3798 | call_fusage = gen_rtx_EXPR_LIST (VOIDmode, |
3799 | gen_rtx_USE (VOIDmode, slot), | |
3800 | call_fusage); | |
f474c6f8 AO |
3801 | if (must_copy) |
3802 | call_fusage = gen_rtx_EXPR_LIST (VOIDmode, | |
3803 | gen_rtx_CLOBBER (VOIDmode, | |
3804 | slot), | |
3805 | call_fusage); | |
3806 | ||
3c0fca12 | 3807 | mode = Pmode; |
f474c6f8 | 3808 | val = force_operand (XEXP (slot, 0), NULL_RTX); |
3c0fca12 | 3809 | } |
3c0fca12 | 3810 | |
5e617be8 | 3811 | mode = promote_function_mode (NULL_TREE, mode, &unsigned_p, NULL_TREE, 0); |
3c0fca12 | 3812 | argvec[count].mode = mode; |
5e617be8 | 3813 | argvec[count].value = convert_modes (mode, GET_MODE (val), val, unsigned_p); |
d5cc9181 | 3814 | argvec[count].reg = targetm.calls.function_arg (args_so_far, mode, |
3c07301f | 3815 | NULL_TREE, true); |
3c0fca12 | 3816 | |
3c0fca12 | 3817 | argvec[count].partial |
d5cc9181 | 3818 | = targetm.calls.arg_partial_bytes (args_so_far, mode, NULL_TREE, 1); |
3c0fca12 | 3819 | |
3576f984 RS |
3820 | if (argvec[count].reg == 0 |
3821 | || argvec[count].partial != 0 | |
3822 | || reg_parm_stack_space > 0) | |
3823 | { | |
3824 | locate_and_pad_parm (mode, NULL_TREE, | |
a4d5044f | 3825 | #ifdef STACK_PARMS_IN_REG_PARM_AREA |
3576f984 | 3826 | 1, |
a4d5044f | 3827 | #else |
3576f984 RS |
3828 | argvec[count].reg != 0, |
3829 | #endif | |
2e4ceca5 | 3830 | reg_parm_stack_space, argvec[count].partial, |
3576f984 RS |
3831 | NULL_TREE, &args_size, &argvec[count].locate); |
3832 | args_size.constant += argvec[count].locate.size.constant; | |
3833 | gcc_assert (!argvec[count].locate.size.var); | |
3834 | } | |
3835 | #ifdef BLOCK_REG_PADDING | |
3836 | else | |
3837 | /* The argument is passed entirely in registers. See at which | |
3838 | end it should be padded. */ | |
3839 | argvec[count].locate.where_pad = | |
3840 | BLOCK_REG_PADDING (mode, NULL_TREE, | |
3841 | GET_MODE_SIZE (mode) <= UNITS_PER_WORD); | |
a4d5044f | 3842 | #endif |
3c0fca12 | 3843 | |
d5cc9181 | 3844 | targetm.calls.function_arg_advance (args_so_far, mode, (tree) 0, true); |
3c0fca12 | 3845 | } |
3c0fca12 | 3846 | |
3c0fca12 RH |
3847 | /* If this machine requires an external definition for library |
3848 | functions, write one out. */ | |
3849 | assemble_external_libcall (fun); | |
3850 | ||
3851 | original_args_size = args_size; | |
1503a7ec JH |
3852 | args_size.constant = (((args_size.constant |
3853 | + stack_pointer_delta | |
3854 | + STACK_BYTES - 1) | |
3855 | / STACK_BYTES | |
3856 | * STACK_BYTES) | |
3857 | - stack_pointer_delta); | |
3c0fca12 RH |
3858 | |
3859 | args_size.constant = MAX (args_size.constant, | |
3860 | reg_parm_stack_space); | |
3861 | ||
5d059ed9 | 3862 | if (! OUTGOING_REG_PARM_STACK_SPACE ((!fndecl ? fntype : TREE_TYPE (fndecl)))) |
ac294f0b | 3863 | args_size.constant -= reg_parm_stack_space; |
3c0fca12 | 3864 | |
38173d38 JH |
3865 | if (args_size.constant > crtl->outgoing_args_size) |
3866 | crtl->outgoing_args_size = args_size.constant; | |
3c0fca12 | 3867 | |
a11e0df4 | 3868 | if (flag_stack_usage_info && !ACCUMULATE_OUTGOING_ARGS) |
d3c12306 EB |
3869 | { |
3870 | int pushed = args_size.constant + pending_stack_adjust; | |
3871 | if (pushed > current_function_pushed_stack_size) | |
3872 | current_function_pushed_stack_size = pushed; | |
3873 | } | |
3874 | ||
f73ad30e JH |
3875 | if (ACCUMULATE_OUTGOING_ARGS) |
3876 | { | |
3877 | /* Since the stack pointer will never be pushed, it is possible for | |
3878 | the evaluation of a parm to clobber something we have already | |
3879 | written to the stack. Since most function calls on RISC machines | |
3880 | do not use the stack, this is uncommon, but must work correctly. | |
3c0fca12 | 3881 | |
f73ad30e JH |
3882 | Therefore, we save any area of the stack that was already written |
3883 | and that we are using. Here we set up to do this by making a new | |
3884 | stack usage map from the old one. | |
3c0fca12 | 3885 | |
f73ad30e JH |
3886 | Another approach might be to try to reorder the argument |
3887 | evaluations to avoid this conflicting stack usage. */ | |
3c0fca12 | 3888 | |
f73ad30e | 3889 | needed = args_size.constant; |
3c0fca12 | 3890 | |
f73ad30e JH |
3891 | /* Since we will be writing into the entire argument area, the |
3892 | map must be allocated for its entire size, not just the part that | |
3893 | is the responsibility of the caller. */ | |
5d059ed9 | 3894 | if (! OUTGOING_REG_PARM_STACK_SPACE ((!fndecl ? fntype : TREE_TYPE (fndecl)))) |
ac294f0b | 3895 | needed += reg_parm_stack_space; |
3c0fca12 RH |
3896 | |
3897 | #ifdef ARGS_GROW_DOWNWARD | |
f73ad30e JH |
3898 | highest_outgoing_arg_in_use = MAX (initial_highest_arg_in_use, |
3899 | needed + 1); | |
3c0fca12 | 3900 | #else |
f73ad30e JH |
3901 | highest_outgoing_arg_in_use = MAX (initial_highest_arg_in_use, |
3902 | needed); | |
3c0fca12 | 3903 | #endif |
5ed6ace5 | 3904 | stack_usage_map_buf = XNEWVEC (char, highest_outgoing_arg_in_use); |
d9725c41 | 3905 | stack_usage_map = stack_usage_map_buf; |
3c0fca12 | 3906 | |
f73ad30e | 3907 | if (initial_highest_arg_in_use) |
2e09e75a JM |
3908 | memcpy (stack_usage_map, initial_stack_usage_map, |
3909 | initial_highest_arg_in_use); | |
3c0fca12 | 3910 | |
f73ad30e | 3911 | if (initial_highest_arg_in_use != highest_outgoing_arg_in_use) |
961192e1 | 3912 | memset (&stack_usage_map[initial_highest_arg_in_use], 0, |
f73ad30e JH |
3913 | highest_outgoing_arg_in_use - initial_highest_arg_in_use); |
3914 | needed = 0; | |
3c0fca12 | 3915 | |
c39ada04 | 3916 | /* We must be careful to use virtual regs before they're instantiated, |
c22cacf3 | 3917 | and real regs afterwards. Loop optimization, for example, can create |
c39ada04 DD |
3918 | new libcalls after we've instantiated the virtual regs, and if we |
3919 | use virtuals anyway, they won't match the rtl patterns. */ | |
3c0fca12 | 3920 | |
c39ada04 | 3921 | if (virtuals_instantiated) |
0a81f074 RS |
3922 | argblock = plus_constant (Pmode, stack_pointer_rtx, |
3923 | STACK_POINTER_OFFSET); | |
c39ada04 DD |
3924 | else |
3925 | argblock = virtual_outgoing_args_rtx; | |
f73ad30e JH |
3926 | } |
3927 | else | |
3928 | { | |
3929 | if (!PUSH_ARGS) | |
3930 | argblock = push_block (GEN_INT (args_size.constant), 0, 0); | |
3931 | } | |
3c0fca12 | 3932 | |
3d9684ae | 3933 | /* We push args individually in reverse order, perform stack alignment |
3c0fca12 | 3934 | before the first push (the last arg). */ |
3d9684ae | 3935 | if (argblock == 0) |
3c0fca12 RH |
3936 | anti_adjust_stack (GEN_INT (args_size.constant |
3937 | - original_args_size.constant)); | |
3c0fca12 | 3938 | |
3d9684ae | 3939 | argnum = nargs - 1; |
3c0fca12 | 3940 | |
f73ad30e JH |
3941 | #ifdef REG_PARM_STACK_SPACE |
3942 | if (ACCUMULATE_OUTGOING_ARGS) | |
3943 | { | |
3944 | /* The argument list is the property of the called routine and it | |
3945 | may clobber it. If the fixed area has been used for previous | |
b820d2b8 AM |
3946 | parameters, we must save and restore it. */ |
3947 | save_area = save_fixed_argument_area (reg_parm_stack_space, argblock, | |
3948 | &low_to_save, &high_to_save); | |
3c0fca12 RH |
3949 | } |
3950 | #endif | |
f725a3ec | 3951 | |
3c0fca12 RH |
3952 | /* Push the args that need to be pushed. */ |
3953 | ||
3954 | /* ARGNUM indexes the ARGVEC array in the order in which the arguments | |
3955 | are to be pushed. */ | |
3d9684ae | 3956 | for (count = 0; count < nargs; count++, argnum--) |
3c0fca12 | 3957 | { |
b3694847 SS |
3958 | enum machine_mode mode = argvec[argnum].mode; |
3959 | rtx val = argvec[argnum].value; | |
3c0fca12 RH |
3960 | rtx reg = argvec[argnum].reg; |
3961 | int partial = argvec[argnum].partial; | |
6bdf8c2e | 3962 | unsigned int parm_align = argvec[argnum].locate.boundary; |
f73ad30e | 3963 | int lower_bound = 0, upper_bound = 0, i; |
3c0fca12 RH |
3964 | |
3965 | if (! (reg != 0 && partial == 0)) | |
3966 | { | |
2b1c5433 JJ |
3967 | rtx use; |
3968 | ||
f73ad30e JH |
3969 | if (ACCUMULATE_OUTGOING_ARGS) |
3970 | { | |
f8a097cd JH |
3971 | /* If this is being stored into a pre-allocated, fixed-size, |
3972 | stack area, save any previous data at that location. */ | |
3c0fca12 RH |
3973 | |
3974 | #ifdef ARGS_GROW_DOWNWARD | |
f73ad30e JH |
3975 | /* stack_slot is negative, but we want to index stack_usage_map |
3976 | with positive values. */ | |
5bc0807c | 3977 | upper_bound = -argvec[argnum].locate.slot_offset.constant + 1; |
e7949876 | 3978 | lower_bound = upper_bound - argvec[argnum].locate.size.constant; |
3c0fca12 | 3979 | #else |
5bc0807c | 3980 | lower_bound = argvec[argnum].locate.slot_offset.constant; |
e7949876 | 3981 | upper_bound = lower_bound + argvec[argnum].locate.size.constant; |
3c0fca12 RH |
3982 | #endif |
3983 | ||
546ff777 AM |
3984 | i = lower_bound; |
3985 | /* Don't worry about things in the fixed argument area; | |
3986 | it has already been saved. */ | |
3987 | if (i < reg_parm_stack_space) | |
3988 | i = reg_parm_stack_space; | |
3989 | while (i < upper_bound && stack_usage_map[i] == 0) | |
3990 | i++; | |
3c0fca12 | 3991 | |
546ff777 | 3992 | if (i < upper_bound) |
f73ad30e | 3993 | { |
e7949876 AM |
3994 | /* We need to make a save area. */ |
3995 | unsigned int size | |
3996 | = argvec[argnum].locate.size.constant * BITS_PER_UNIT; | |
f73ad30e | 3997 | enum machine_mode save_mode |
e7949876 AM |
3998 | = mode_for_size (size, MODE_INT, 1); |
3999 | rtx adr | |
0a81f074 | 4000 | = plus_constant (Pmode, argblock, |
e7949876 | 4001 | argvec[argnum].locate.offset.constant); |
f73ad30e | 4002 | rtx stack_area |
e7949876 | 4003 | = gen_rtx_MEM (save_mode, memory_address (save_mode, adr)); |
f73ad30e | 4004 | |
9778f2f8 JH |
4005 | if (save_mode == BLKmode) |
4006 | { | |
4007 | argvec[argnum].save_area | |
4008 | = assign_stack_temp (BLKmode, | |
9474e8ab MM |
4009 | argvec[argnum].locate.size.constant |
4010 | ); | |
9778f2f8 | 4011 | |
1a8cb155 RS |
4012 | emit_block_move (validize_mem |
4013 | (copy_rtx (argvec[argnum].save_area)), | |
c22cacf3 | 4014 | stack_area, |
9778f2f8 JH |
4015 | GEN_INT (argvec[argnum].locate.size.constant), |
4016 | BLOCK_OP_CALL_PARM); | |
4017 | } | |
4018 | else | |
4019 | { | |
4020 | argvec[argnum].save_area = gen_reg_rtx (save_mode); | |
4021 | ||
4022 | emit_move_insn (argvec[argnum].save_area, stack_area); | |
4023 | } | |
f73ad30e | 4024 | } |
3c0fca12 | 4025 | } |
19caa751 | 4026 | |
6bdf8c2e | 4027 | emit_push_insn (val, mode, NULL_TREE, NULL_RTX, parm_align, |
44bb111a | 4028 | partial, reg, 0, argblock, |
e7949876 AM |
4029 | GEN_INT (argvec[argnum].locate.offset.constant), |
4030 | reg_parm_stack_space, | |
4031 | ARGS_SIZE_RTX (argvec[argnum].locate.alignment_pad)); | |
3c0fca12 | 4032 | |
3c0fca12 | 4033 | /* Now mark the segment we just used. */ |
f73ad30e JH |
4034 | if (ACCUMULATE_OUTGOING_ARGS) |
4035 | for (i = lower_bound; i < upper_bound; i++) | |
4036 | stack_usage_map[i] = 1; | |
3c0fca12 RH |
4037 | |
4038 | NO_DEFER_POP; | |
475a3eef | 4039 | |
2b1c5433 JJ |
4040 | /* Indicate argument access so that alias.c knows that these |
4041 | values are live. */ | |
4042 | if (argblock) | |
0a81f074 | 4043 | use = plus_constant (Pmode, argblock, |
2b1c5433 JJ |
4044 | argvec[argnum].locate.offset.constant); |
4045 | else | |
4046 | /* When arguments are pushed, trying to tell alias.c where | |
4047 | exactly this argument is won't work, because the | |
4048 | auto-increment causes confusion. So we merely indicate | |
4049 | that we access something with a known mode somewhere on | |
4050 | the stack. */ | |
4051 | use = gen_rtx_PLUS (Pmode, virtual_outgoing_args_rtx, | |
4052 | gen_rtx_SCRATCH (Pmode)); | |
4053 | use = gen_rtx_MEM (argvec[argnum].mode, use); | |
4054 | use = gen_rtx_USE (VOIDmode, use); | |
4055 | call_fusage = gen_rtx_EXPR_LIST (VOIDmode, use, call_fusage); | |
3c0fca12 RH |
4056 | } |
4057 | } | |
4058 | ||
3d9684ae | 4059 | argnum = nargs - 1; |
3c0fca12 | 4060 | |
531ca746 | 4061 | fun = prepare_call_address (NULL, fun, NULL, &call_fusage, 0, 0); |
3c0fca12 RH |
4062 | |
4063 | /* Now load any reg parms into their regs. */ | |
4064 | ||
4065 | /* ARGNUM indexes the ARGVEC array in the order in which the arguments | |
4066 | are to be pushed. */ | |
3d9684ae | 4067 | for (count = 0; count < nargs; count++, argnum--) |
3c0fca12 | 4068 | { |
ff15c351 | 4069 | enum machine_mode mode = argvec[argnum].mode; |
b3694847 | 4070 | rtx val = argvec[argnum].value; |
3c0fca12 RH |
4071 | rtx reg = argvec[argnum].reg; |
4072 | int partial = argvec[argnum].partial; | |
ee222ce0 | 4073 | #ifdef BLOCK_REG_PADDING |
460b171d | 4074 | int size = 0; |
ee222ce0 | 4075 | #endif |
460b171d | 4076 | |
3c0fca12 RH |
4077 | /* Handle calls that pass values in multiple non-contiguous |
4078 | locations. The PA64 has examples of this for library calls. */ | |
4079 | if (reg != 0 && GET_CODE (reg) == PARALLEL) | |
ff15c351 | 4080 | emit_group_load (reg, val, NULL_TREE, GET_MODE_SIZE (mode)); |
3c0fca12 | 4081 | else if (reg != 0 && partial == 0) |
460b171d JB |
4082 | { |
4083 | emit_move_insn (reg, val); | |
4084 | #ifdef BLOCK_REG_PADDING | |
4085 | size = GET_MODE_SIZE (argvec[argnum].mode); | |
4086 | ||
4087 | /* Copied from load_register_parameters. */ | |
4088 | ||
4089 | /* Handle case where we have a value that needs shifting | |
4090 | up to the msb. eg. a QImode value and we're padding | |
4091 | upward on a BYTES_BIG_ENDIAN machine. */ | |
4092 | if (size < UNITS_PER_WORD | |
4093 | && (argvec[argnum].locate.where_pad | |
4094 | == (BYTES_BIG_ENDIAN ? upward : downward))) | |
4095 | { | |
4096 | rtx x; | |
4097 | int shift = (UNITS_PER_WORD - size) * BITS_PER_UNIT; | |
4098 | ||
4099 | /* Assigning REG here rather than a temp makes CALL_FUSAGE | |
4100 | report the whole reg as used. Strictly speaking, the | |
4101 | call only uses SIZE bytes at the msb end, but it doesn't | |
4102 | seem worth generating rtl to say that. */ | |
4103 | reg = gen_rtx_REG (word_mode, REGNO (reg)); | |
4104 | x = expand_shift (LSHIFT_EXPR, word_mode, reg, shift, reg, 1); | |
4105 | if (x != reg) | |
4106 | emit_move_insn (reg, x); | |
4107 | } | |
4108 | #endif | |
4109 | } | |
3c0fca12 RH |
4110 | |
4111 | NO_DEFER_POP; | |
4112 | } | |
4113 | ||
3c0fca12 RH |
4114 | /* Any regs containing parms remain in use through the call. */ |
4115 | for (count = 0; count < nargs; count++) | |
4116 | { | |
4117 | rtx reg = argvec[count].reg; | |
4118 | if (reg != 0 && GET_CODE (reg) == PARALLEL) | |
4119 | use_group_regs (&call_fusage, reg); | |
4120 | else if (reg != 0) | |
3b1bf459 BS |
4121 | { |
4122 | int partial = argvec[count].partial; | |
4123 | if (partial) | |
4124 | { | |
4125 | int nregs; | |
4126 | gcc_assert (partial % UNITS_PER_WORD == 0); | |
4127 | nregs = partial / UNITS_PER_WORD; | |
4128 | use_regs (&call_fusage, REGNO (reg), nregs); | |
4129 | } | |
4130 | else | |
4131 | use_reg (&call_fusage, reg); | |
4132 | } | |
3c0fca12 RH |
4133 | } |
4134 | ||
4135 | /* Pass the function the address in which to return a structure value. */ | |
61f71b34 | 4136 | if (mem_value != 0 && struct_value != 0 && ! pcc_struct_value) |
3c0fca12 | 4137 | { |
61f71b34 | 4138 | emit_move_insn (struct_value, |
3c0fca12 RH |
4139 | force_reg (Pmode, |
4140 | force_operand (XEXP (mem_value, 0), | |
4141 | NULL_RTX))); | |
f8cfc6aa | 4142 | if (REG_P (struct_value)) |
61f71b34 | 4143 | use_reg (&call_fusage, struct_value); |
3c0fca12 RH |
4144 | } |
4145 | ||
4146 | /* Don't allow popping to be deferred, since then | |
4147 | cse'ing of library calls could delete a call and leave the pop. */ | |
4148 | NO_DEFER_POP; | |
5591ee6f | 4149 | valreg = (mem_value == 0 && outmode != VOIDmode |
390b17c2 | 4150 | ? hard_libcall_value (outmode, orgfun) : NULL_RTX); |
3c0fca12 | 4151 | |
ce48579b | 4152 | /* Stack must be properly aligned now. */ |
366de0ce NS |
4153 | gcc_assert (!(stack_pointer_delta |
4154 | & (PREFERRED_STACK_BOUNDARY / BITS_PER_UNIT - 1))); | |
ebcd0b57 | 4155 | |
695ee791 RH |
4156 | before_call = get_last_insn (); |
4157 | ||
3c0fca12 RH |
4158 | /* We pass the old value of inhibit_defer_pop + 1 to emit_call_1, which |
4159 | will set inhibit_defer_pop to that value. */ | |
de76b467 JH |
4160 | /* The return type is needed to decide how many bytes the function pops. |
4161 | Signedness plays no role in that, so for simplicity, we pretend it's | |
4162 | always signed. We also assume that the list of arguments passed has | |
4163 | no impact, so we pretend it is unknown. */ | |
3c0fca12 | 4164 | |
6de9cd9a | 4165 | emit_call_1 (fun, NULL, |
f725a3ec | 4166 | get_identifier (XSTR (orgfun, 0)), |
b0c48229 | 4167 | build_function_type (tfom, NULL_TREE), |
f725a3ec | 4168 | original_args_size.constant, args_size.constant, |
3c0fca12 | 4169 | struct_value_size, |
d5cc9181 | 4170 | targetm.calls.function_arg (args_so_far, |
3c07301f | 4171 | VOIDmode, void_type_node, true), |
5591ee6f | 4172 | valreg, |
d5cc9181 | 4173 | old_inhibit_defer_pop + 1, call_fusage, flags, args_so_far); |
3c0fca12 | 4174 | |
4f660b15 RO |
4175 | if (flag_use_caller_save) |
4176 | { | |
4177 | rtx last, datum = orgfun; | |
4178 | gcc_assert (GET_CODE (datum) == SYMBOL_REF); | |
4179 | last = last_call_insn (); | |
4180 | add_reg_note (last, REG_CALL_DECL, datum); | |
4181 | } | |
4182 | ||
460b171d JB |
4183 | /* Right-shift returned value if necessary. */ |
4184 | if (!pcc_struct_value | |
4185 | && TYPE_MODE (tfom) != BLKmode | |
4186 | && targetm.calls.return_in_msb (tfom)) | |
4187 | { | |
4188 | shift_return_value (TYPE_MODE (tfom), false, valreg); | |
4189 | valreg = gen_rtx_REG (TYPE_MODE (tfom), REGNO (valreg)); | |
4190 | } | |
4191 | ||
6fb5fa3c DB |
4192 | /* For calls to `setjmp', etc., inform function.c:setjmp_warnings |
4193 | that it should complain if nonvolatile values are live. For | |
4194 | functions that cannot return, inform flow that control does not | |
4195 | fall through. */ | |
6e14af16 | 4196 | if (flags & ECF_NORETURN) |
695ee791 | 4197 | { |
570a98eb | 4198 | /* The barrier note must be emitted |
695ee791 RH |
4199 | immediately after the CALL_INSN. Some ports emit more than |
4200 | just a CALL_INSN above, so we must search for it here. */ | |
48810515 | 4201 | rtx_insn *last = get_last_insn (); |
4b4bf941 | 4202 | while (!CALL_P (last)) |
695ee791 RH |
4203 | { |
4204 | last = PREV_INSN (last); | |
4205 | /* There was no CALL_INSN? */ | |
366de0ce | 4206 | gcc_assert (last != before_call); |
695ee791 RH |
4207 | } |
4208 | ||
570a98eb | 4209 | emit_barrier_after (last); |
695ee791 RH |
4210 | } |
4211 | ||
85da11a6 EB |
4212 | /* Consider that "regular" libcalls, i.e. all of them except for LCT_THROW |
4213 | and LCT_RETURNS_TWICE, cannot perform non-local gotos. */ | |
4214 | if (flags & ECF_NOTHROW) | |
4215 | { | |
48810515 | 4216 | rtx_insn *last = get_last_insn (); |
85da11a6 EB |
4217 | while (!CALL_P (last)) |
4218 | { | |
4219 | last = PREV_INSN (last); | |
4220 | /* There was no CALL_INSN? */ | |
4221 | gcc_assert (last != before_call); | |
4222 | } | |
4223 | ||
4224 | make_reg_eh_region_note_nothrow_nononlocal (last); | |
4225 | } | |
4226 | ||
3c0fca12 RH |
4227 | /* Now restore inhibit_defer_pop to its actual original value. */ |
4228 | OK_DEFER_POP; | |
4229 | ||
4230 | pop_temp_slots (); | |
4231 | ||
4232 | /* Copy the value to the right place. */ | |
de76b467 | 4233 | if (outmode != VOIDmode && retval) |
3c0fca12 RH |
4234 | { |
4235 | if (mem_value) | |
4236 | { | |
4237 | if (value == 0) | |
4238 | value = mem_value; | |
4239 | if (value != mem_value) | |
4240 | emit_move_insn (value, mem_value); | |
4241 | } | |
c3297561 AO |
4242 | else if (GET_CODE (valreg) == PARALLEL) |
4243 | { | |
4244 | if (value == 0) | |
4245 | value = gen_reg_rtx (outmode); | |
643642eb | 4246 | emit_group_store (value, valreg, NULL_TREE, GET_MODE_SIZE (outmode)); |
c3297561 | 4247 | } |
3c0fca12 | 4248 | else |
7ab0aca2 | 4249 | { |
cde0f3fd | 4250 | /* Convert to the proper mode if a promotion has been active. */ |
7ab0aca2 RH |
4251 | if (GET_MODE (valreg) != outmode) |
4252 | { | |
4253 | int unsignedp = TYPE_UNSIGNED (tfom); | |
4254 | ||
cde0f3fd PB |
4255 | gcc_assert (promote_function_mode (tfom, outmode, &unsignedp, |
4256 | fndecl ? TREE_TYPE (fndecl) : fntype, 1) | |
7ab0aca2 | 4257 | == GET_MODE (valreg)); |
7ab0aca2 RH |
4258 | valreg = convert_modes (outmode, GET_MODE (valreg), valreg, 0); |
4259 | } | |
4260 | ||
4261 | if (value != 0) | |
4262 | emit_move_insn (value, valreg); | |
4263 | else | |
4264 | value = valreg; | |
4265 | } | |
3c0fca12 RH |
4266 | } |
4267 | ||
f73ad30e | 4268 | if (ACCUMULATE_OUTGOING_ARGS) |
3c0fca12 | 4269 | { |
f73ad30e JH |
4270 | #ifdef REG_PARM_STACK_SPACE |
4271 | if (save_area) | |
b820d2b8 AM |
4272 | restore_fixed_argument_area (save_area, argblock, |
4273 | high_to_save, low_to_save); | |
3c0fca12 | 4274 | #endif |
f725a3ec | 4275 | |
f73ad30e JH |
4276 | /* If we saved any argument areas, restore them. */ |
4277 | for (count = 0; count < nargs; count++) | |
4278 | if (argvec[count].save_area) | |
4279 | { | |
4280 | enum machine_mode save_mode = GET_MODE (argvec[count].save_area); | |
0a81f074 | 4281 | rtx adr = plus_constant (Pmode, argblock, |
e7949876 AM |
4282 | argvec[count].locate.offset.constant); |
4283 | rtx stack_area = gen_rtx_MEM (save_mode, | |
4284 | memory_address (save_mode, adr)); | |
f73ad30e | 4285 | |
9778f2f8 JH |
4286 | if (save_mode == BLKmode) |
4287 | emit_block_move (stack_area, | |
1a8cb155 RS |
4288 | validize_mem |
4289 | (copy_rtx (argvec[count].save_area)), | |
9778f2f8 JH |
4290 | GEN_INT (argvec[count].locate.size.constant), |
4291 | BLOCK_OP_CALL_PARM); | |
4292 | else | |
4293 | emit_move_insn (stack_area, argvec[count].save_area); | |
f73ad30e | 4294 | } |
3c0fca12 | 4295 | |
f73ad30e JH |
4296 | highest_outgoing_arg_in_use = initial_highest_arg_in_use; |
4297 | stack_usage_map = initial_stack_usage_map; | |
4298 | } | |
43bc5f13 | 4299 | |
04695783 | 4300 | free (stack_usage_map_buf); |
d9725c41 | 4301 | |
de76b467 JH |
4302 | return value; |
4303 | ||
4304 | } | |
4305 | \f | |
4306 | /* Output a library call to function FUN (a SYMBOL_REF rtx) | |
4307 | (emitting the queue unless NO_QUEUE is nonzero), | |
4308 | for a value of mode OUTMODE, | |
4309 | with NARGS different arguments, passed as alternating rtx values | |
4310 | and machine_modes to convert them to. | |
de76b467 | 4311 | |
84b8030f KZ |
4312 | FN_TYPE should be LCT_NORMAL for `normal' calls, LCT_CONST for |
4313 | `const' calls, LCT_PURE for `pure' calls, or other LCT_ value for | |
4314 | other types of library calls. */ | |
de76b467 JH |
4315 | |
4316 | void | |
e34d07f2 KG |
4317 | emit_library_call (rtx orgfun, enum libcall_type fn_type, |
4318 | enum machine_mode outmode, int nargs, ...) | |
de76b467 | 4319 | { |
e34d07f2 | 4320 | va_list p; |
d329e058 | 4321 | |
e34d07f2 | 4322 | va_start (p, nargs); |
2a8f6b90 | 4323 | emit_library_call_value_1 (0, orgfun, NULL_RTX, fn_type, outmode, nargs, p); |
e34d07f2 | 4324 | va_end (p); |
de76b467 JH |
4325 | } |
4326 | \f | |
4327 | /* Like emit_library_call except that an extra argument, VALUE, | |
4328 | comes second and says where to store the result. | |
4329 | (If VALUE is zero, this function chooses a convenient way | |
4330 | to return the value. | |
4331 | ||
4332 | This function returns an rtx for where the value is to be found. | |
4333 | If VALUE is nonzero, VALUE is returned. */ | |
4334 | ||
4335 | rtx | |
e34d07f2 KG |
4336 | emit_library_call_value (rtx orgfun, rtx value, |
4337 | enum libcall_type fn_type, | |
4338 | enum machine_mode outmode, int nargs, ...) | |
de76b467 | 4339 | { |
6268b922 | 4340 | rtx result; |
e34d07f2 | 4341 | va_list p; |
d329e058 | 4342 | |
e34d07f2 | 4343 | va_start (p, nargs); |
6268b922 KG |
4344 | result = emit_library_call_value_1 (1, orgfun, value, fn_type, outmode, |
4345 | nargs, p); | |
e34d07f2 | 4346 | va_end (p); |
de76b467 | 4347 | |
6268b922 | 4348 | return result; |
322e3e34 RK |
4349 | } |
4350 | \f | |
51bbfa0c RS |
4351 | /* Store a single argument for a function call |
4352 | into the register or memory area where it must be passed. | |
4353 | *ARG describes the argument value and where to pass it. | |
4354 | ||
4355 | ARGBLOCK is the address of the stack-block for all the arguments, | |
d45cf215 | 4356 | or 0 on a machine where arguments are pushed individually. |
51bbfa0c RS |
4357 | |
4358 | MAY_BE_ALLOCA nonzero says this could be a call to `alloca' | |
f725a3ec | 4359 | so must be careful about how the stack is used. |
51bbfa0c RS |
4360 | |
4361 | VARIABLE_SIZE nonzero says that this was a variable-sized outgoing | |
4362 | argument stack. This is used if ACCUMULATE_OUTGOING_ARGS to indicate | |
4363 | that we need not worry about saving and restoring the stack. | |
4364 | ||
4c6b3b2a | 4365 | FNDECL is the declaration of the function we are calling. |
f725a3ec | 4366 | |
da7d8304 | 4367 | Return nonzero if this arg should cause sibcall failure, |
4c6b3b2a | 4368 | zero otherwise. */ |
51bbfa0c | 4369 | |
4c6b3b2a | 4370 | static int |
d329e058 AJ |
4371 | store_one_arg (struct arg_data *arg, rtx argblock, int flags, |
4372 | int variable_size ATTRIBUTE_UNUSED, int reg_parm_stack_space) | |
51bbfa0c | 4373 | { |
b3694847 | 4374 | tree pval = arg->tree_value; |
51bbfa0c RS |
4375 | rtx reg = 0; |
4376 | int partial = 0; | |
4377 | int used = 0; | |
6a651371 | 4378 | int i, lower_bound = 0, upper_bound = 0; |
4c6b3b2a | 4379 | int sibcall_failure = 0; |
51bbfa0c RS |
4380 | |
4381 | if (TREE_CODE (pval) == ERROR_MARK) | |
4c6b3b2a | 4382 | return 1; |
51bbfa0c | 4383 | |
cc79451b RK |
4384 | /* Push a new temporary level for any temporaries we make for |
4385 | this argument. */ | |
4386 | push_temp_slots (); | |
4387 | ||
f8a097cd | 4388 | if (ACCUMULATE_OUTGOING_ARGS && !(flags & ECF_SIBCALL)) |
51bbfa0c | 4389 | { |
f73ad30e JH |
4390 | /* If this is being stored into a pre-allocated, fixed-size, stack area, |
4391 | save any previous data at that location. */ | |
4392 | if (argblock && ! variable_size && arg->stack) | |
4393 | { | |
51bbfa0c | 4394 | #ifdef ARGS_GROW_DOWNWARD |
f73ad30e JH |
4395 | /* stack_slot is negative, but we want to index stack_usage_map |
4396 | with positive values. */ | |
4397 | if (GET_CODE (XEXP (arg->stack_slot, 0)) == PLUS) | |
4398 | upper_bound = -INTVAL (XEXP (XEXP (arg->stack_slot, 0), 1)) + 1; | |
4399 | else | |
4400 | upper_bound = 0; | |
51bbfa0c | 4401 | |
e7949876 | 4402 | lower_bound = upper_bound - arg->locate.size.constant; |
51bbfa0c | 4403 | #else |
f73ad30e JH |
4404 | if (GET_CODE (XEXP (arg->stack_slot, 0)) == PLUS) |
4405 | lower_bound = INTVAL (XEXP (XEXP (arg->stack_slot, 0), 1)); | |
4406 | else | |
4407 | lower_bound = 0; | |
51bbfa0c | 4408 | |
e7949876 | 4409 | upper_bound = lower_bound + arg->locate.size.constant; |
51bbfa0c RS |
4410 | #endif |
4411 | ||
546ff777 AM |
4412 | i = lower_bound; |
4413 | /* Don't worry about things in the fixed argument area; | |
4414 | it has already been saved. */ | |
4415 | if (i < reg_parm_stack_space) | |
4416 | i = reg_parm_stack_space; | |
4417 | while (i < upper_bound && stack_usage_map[i] == 0) | |
4418 | i++; | |
51bbfa0c | 4419 | |
546ff777 | 4420 | if (i < upper_bound) |
51bbfa0c | 4421 | { |
e7949876 AM |
4422 | /* We need to make a save area. */ |
4423 | unsigned int size = arg->locate.size.constant * BITS_PER_UNIT; | |
4424 | enum machine_mode save_mode = mode_for_size (size, MODE_INT, 1); | |
4425 | rtx adr = memory_address (save_mode, XEXP (arg->stack_slot, 0)); | |
4426 | rtx stack_area = gen_rtx_MEM (save_mode, adr); | |
f73ad30e JH |
4427 | |
4428 | if (save_mode == BLKmode) | |
4429 | { | |
9ee5337d EB |
4430 | arg->save_area |
4431 | = assign_temp (TREE_TYPE (arg->tree_value), 1, 1); | |
f73ad30e | 4432 | preserve_temp_slots (arg->save_area); |
1a8cb155 RS |
4433 | emit_block_move (validize_mem (copy_rtx (arg->save_area)), |
4434 | stack_area, | |
7816b87e | 4435 | GEN_INT (arg->locate.size.constant), |
44bb111a | 4436 | BLOCK_OP_CALL_PARM); |
f73ad30e JH |
4437 | } |
4438 | else | |
4439 | { | |
4440 | arg->save_area = gen_reg_rtx (save_mode); | |
4441 | emit_move_insn (arg->save_area, stack_area); | |
4442 | } | |
51bbfa0c RS |
4443 | } |
4444 | } | |
4445 | } | |
b564df06 | 4446 | |
51bbfa0c RS |
4447 | /* If this isn't going to be placed on both the stack and in registers, |
4448 | set up the register and number of words. */ | |
4449 | if (! arg->pass_on_stack) | |
aa7634dd DM |
4450 | { |
4451 | if (flags & ECF_SIBCALL) | |
4452 | reg = arg->tail_call_reg; | |
4453 | else | |
4454 | reg = arg->reg; | |
4455 | partial = arg->partial; | |
4456 | } | |
51bbfa0c | 4457 | |
366de0ce NS |
4458 | /* Being passed entirely in a register. We shouldn't be called in |
4459 | this case. */ | |
4460 | gcc_assert (reg == 0 || partial != 0); | |
c22cacf3 | 4461 | |
4ab56118 RK |
4462 | /* If this arg needs special alignment, don't load the registers |
4463 | here. */ | |
4464 | if (arg->n_aligned_regs != 0) | |
4465 | reg = 0; | |
f725a3ec | 4466 | |
4ab56118 | 4467 | /* If this is being passed partially in a register, we can't evaluate |
51bbfa0c RS |
4468 | it directly into its stack slot. Otherwise, we can. */ |
4469 | if (arg->value == 0) | |
d64f5a78 | 4470 | { |
d64f5a78 RS |
4471 | /* stack_arg_under_construction is nonzero if a function argument is |
4472 | being evaluated directly into the outgoing argument list and | |
4473 | expand_call must take special action to preserve the argument list | |
4474 | if it is called recursively. | |
4475 | ||
4476 | For scalar function arguments stack_usage_map is sufficient to | |
4477 | determine which stack slots must be saved and restored. Scalar | |
4478 | arguments in general have pass_on_stack == 0. | |
4479 | ||
4480 | If this argument is initialized by a function which takes the | |
4481 | address of the argument (a C++ constructor or a C function | |
4482 | returning a BLKmode structure), then stack_usage_map is | |
4483 | insufficient and expand_call must push the stack around the | |
4484 | function call. Such arguments have pass_on_stack == 1. | |
4485 | ||
4486 | Note that it is always safe to set stack_arg_under_construction, | |
4487 | but this generates suboptimal code if set when not needed. */ | |
4488 | ||
4489 | if (arg->pass_on_stack) | |
4490 | stack_arg_under_construction++; | |
f73ad30e | 4491 | |
3a08477a RK |
4492 | arg->value = expand_expr (pval, |
4493 | (partial | |
4494 | || TYPE_MODE (TREE_TYPE (pval)) != arg->mode) | |
4495 | ? NULL_RTX : arg->stack, | |
8403445a | 4496 | VOIDmode, EXPAND_STACK_PARM); |
1efe6448 RK |
4497 | |
4498 | /* If we are promoting object (or for any other reason) the mode | |
4499 | doesn't agree, convert the mode. */ | |
4500 | ||
7373d92d RK |
4501 | if (arg->mode != TYPE_MODE (TREE_TYPE (pval))) |
4502 | arg->value = convert_modes (arg->mode, TYPE_MODE (TREE_TYPE (pval)), | |
4503 | arg->value, arg->unsignedp); | |
1efe6448 | 4504 | |
d64f5a78 RS |
4505 | if (arg->pass_on_stack) |
4506 | stack_arg_under_construction--; | |
d64f5a78 | 4507 | } |
51bbfa0c | 4508 | |
0dc42b03 | 4509 | /* Check for overlap with already clobbered argument area. */ |
07eef816 KH |
4510 | if ((flags & ECF_SIBCALL) |
4511 | && MEM_P (arg->value) | |
4512 | && mem_overlaps_already_clobbered_arg_p (XEXP (arg->value, 0), | |
4513 | arg->locate.size.constant)) | |
4514 | sibcall_failure = 1; | |
0dc42b03 | 4515 | |
51bbfa0c RS |
4516 | /* Don't allow anything left on stack from computation |
4517 | of argument to alloca. */ | |
f8a097cd | 4518 | if (flags & ECF_MAY_BE_ALLOCA) |
51bbfa0c RS |
4519 | do_pending_stack_adjust (); |
4520 | ||
4521 | if (arg->value == arg->stack) | |
37a08a29 RK |
4522 | /* If the value is already in the stack slot, we are done. */ |
4523 | ; | |
1efe6448 | 4524 | else if (arg->mode != BLKmode) |
51bbfa0c | 4525 | { |
b3694847 | 4526 | int size; |
46bd2bee | 4527 | unsigned int parm_align; |
51bbfa0c RS |
4528 | |
4529 | /* Argument is a scalar, not entirely passed in registers. | |
4530 | (If part is passed in registers, arg->partial says how much | |
4531 | and emit_push_insn will take care of putting it there.) | |
f725a3ec | 4532 | |
51bbfa0c RS |
4533 | Push it, and if its size is less than the |
4534 | amount of space allocated to it, | |
4535 | also bump stack pointer by the additional space. | |
4536 | Note that in C the default argument promotions | |
4537 | will prevent such mismatches. */ | |
4538 | ||
1efe6448 | 4539 | size = GET_MODE_SIZE (arg->mode); |
51bbfa0c RS |
4540 | /* Compute how much space the push instruction will push. |
4541 | On many machines, pushing a byte will advance the stack | |
4542 | pointer by a halfword. */ | |
4543 | #ifdef PUSH_ROUNDING | |
4544 | size = PUSH_ROUNDING (size); | |
4545 | #endif | |
4546 | used = size; | |
4547 | ||
4548 | /* Compute how much space the argument should get: | |
4549 | round up to a multiple of the alignment for arguments. */ | |
1efe6448 | 4550 | if (none != FUNCTION_ARG_PADDING (arg->mode, TREE_TYPE (pval))) |
51bbfa0c RS |
4551 | used = (((size + PARM_BOUNDARY / BITS_PER_UNIT - 1) |
4552 | / (PARM_BOUNDARY / BITS_PER_UNIT)) | |
4553 | * (PARM_BOUNDARY / BITS_PER_UNIT)); | |
4554 | ||
46bd2bee JM |
4555 | /* Compute the alignment of the pushed argument. */ |
4556 | parm_align = arg->locate.boundary; | |
4557 | if (FUNCTION_ARG_PADDING (arg->mode, TREE_TYPE (pval)) == downward) | |
4558 | { | |
4559 | int pad = used - size; | |
4560 | if (pad) | |
4561 | { | |
4562 | unsigned int pad_align = (pad & -pad) * BITS_PER_UNIT; | |
4563 | parm_align = MIN (parm_align, pad_align); | |
4564 | } | |
4565 | } | |
4566 | ||
51bbfa0c RS |
4567 | /* This isn't already where we want it on the stack, so put it there. |
4568 | This can either be done with push or copy insns. */ | |
d329e058 | 4569 | emit_push_insn (arg->value, arg->mode, TREE_TYPE (pval), NULL_RTX, |
46bd2bee | 4570 | parm_align, partial, reg, used - size, argblock, |
e7949876 AM |
4571 | ARGS_SIZE_RTX (arg->locate.offset), reg_parm_stack_space, |
4572 | ARGS_SIZE_RTX (arg->locate.alignment_pad)); | |
841404cd AO |
4573 | |
4574 | /* Unless this is a partially-in-register argument, the argument is now | |
4575 | in the stack. */ | |
4576 | if (partial == 0) | |
4577 | arg->value = arg->stack; | |
51bbfa0c RS |
4578 | } |
4579 | else | |
4580 | { | |
4581 | /* BLKmode, at least partly to be pushed. */ | |
4582 | ||
1b1f20ca | 4583 | unsigned int parm_align; |
b3694847 | 4584 | int excess; |
51bbfa0c RS |
4585 | rtx size_rtx; |
4586 | ||
4587 | /* Pushing a nonscalar. | |
4588 | If part is passed in registers, PARTIAL says how much | |
4589 | and emit_push_insn will take care of putting it there. */ | |
4590 | ||
4591 | /* Round its size up to a multiple | |
4592 | of the allocation unit for arguments. */ | |
4593 | ||
e7949876 | 4594 | if (arg->locate.size.var != 0) |
51bbfa0c RS |
4595 | { |
4596 | excess = 0; | |
e7949876 | 4597 | size_rtx = ARGS_SIZE_RTX (arg->locate.size); |
51bbfa0c RS |
4598 | } |
4599 | else | |
4600 | { | |
78a52f11 RH |
4601 | /* PUSH_ROUNDING has no effect on us, because emit_push_insn |
4602 | for BLKmode is careful to avoid it. */ | |
4603 | excess = (arg->locate.size.constant | |
4604 | - int_size_in_bytes (TREE_TYPE (pval)) | |
4605 | + partial); | |
db4c55f6 | 4606 | size_rtx = expand_expr (size_in_bytes (TREE_TYPE (pval)), |
bbbbb16a ILT |
4607 | NULL_RTX, TYPE_MODE (sizetype), |
4608 | EXPAND_NORMAL); | |
51bbfa0c RS |
4609 | } |
4610 | ||
bfc45551 | 4611 | parm_align = arg->locate.boundary; |
1b1f20ca RH |
4612 | |
4613 | /* When an argument is padded down, the block is aligned to | |
4614 | PARM_BOUNDARY, but the actual argument isn't. */ | |
4615 | if (FUNCTION_ARG_PADDING (arg->mode, TREE_TYPE (pval)) == downward) | |
4616 | { | |
e7949876 | 4617 | if (arg->locate.size.var) |
1b1f20ca RH |
4618 | parm_align = BITS_PER_UNIT; |
4619 | else if (excess) | |
4620 | { | |
97d05bfd | 4621 | unsigned int excess_align = (excess & -excess) * BITS_PER_UNIT; |
1b1f20ca RH |
4622 | parm_align = MIN (parm_align, excess_align); |
4623 | } | |
4624 | } | |
4625 | ||
3c0cb5de | 4626 | if ((flags & ECF_SIBCALL) && MEM_P (arg->value)) |
4c6b3b2a JJ |
4627 | { |
4628 | /* emit_push_insn might not work properly if arg->value and | |
e7949876 | 4629 | argblock + arg->locate.offset areas overlap. */ |
4c6b3b2a JJ |
4630 | rtx x = arg->value; |
4631 | int i = 0; | |
4632 | ||
38173d38 | 4633 | if (XEXP (x, 0) == crtl->args.internal_arg_pointer |
4c6b3b2a JJ |
4634 | || (GET_CODE (XEXP (x, 0)) == PLUS |
4635 | && XEXP (XEXP (x, 0), 0) == | |
38173d38 | 4636 | crtl->args.internal_arg_pointer |
481683e1 | 4637 | && CONST_INT_P (XEXP (XEXP (x, 0), 1)))) |
4c6b3b2a | 4638 | { |
38173d38 | 4639 | if (XEXP (x, 0) != crtl->args.internal_arg_pointer) |
4c6b3b2a JJ |
4640 | i = INTVAL (XEXP (XEXP (x, 0), 1)); |
4641 | ||
e0a21ab9 | 4642 | /* expand_call should ensure this. */ |
366de0ce | 4643 | gcc_assert (!arg->locate.offset.var |
d6c2c77c | 4644 | && arg->locate.size.var == 0 |
481683e1 | 4645 | && CONST_INT_P (size_rtx)); |
4c6b3b2a | 4646 | |
e7949876 | 4647 | if (arg->locate.offset.constant > i) |
4c6b3b2a | 4648 | { |
e7949876 | 4649 | if (arg->locate.offset.constant < i + INTVAL (size_rtx)) |
4c6b3b2a JJ |
4650 | sibcall_failure = 1; |
4651 | } | |
e7949876 | 4652 | else if (arg->locate.offset.constant < i) |
4c6b3b2a | 4653 | { |
d6c2c77c JC |
4654 | /* Use arg->locate.size.constant instead of size_rtx |
4655 | because we only care about the part of the argument | |
4656 | on the stack. */ | |
4657 | if (i < (arg->locate.offset.constant | |
4658 | + arg->locate.size.constant)) | |
4659 | sibcall_failure = 1; | |
4660 | } | |
4661 | else | |
4662 | { | |
4663 | /* Even though they appear to be at the same location, | |
4664 | if part of the outgoing argument is in registers, | |
4665 | they aren't really at the same location. Check for | |
4666 | this by making sure that the incoming size is the | |
4667 | same as the outgoing size. */ | |
4668 | if (arg->locate.size.constant != INTVAL (size_rtx)) | |
4c6b3b2a JJ |
4669 | sibcall_failure = 1; |
4670 | } | |
4671 | } | |
4672 | } | |
4673 | ||
1efe6448 | 4674 | emit_push_insn (arg->value, arg->mode, TREE_TYPE (pval), size_rtx, |
1b1f20ca | 4675 | parm_align, partial, reg, excess, argblock, |
e7949876 AM |
4676 | ARGS_SIZE_RTX (arg->locate.offset), reg_parm_stack_space, |
4677 | ARGS_SIZE_RTX (arg->locate.alignment_pad)); | |
51bbfa0c | 4678 | |
841404cd AO |
4679 | /* Unless this is a partially-in-register argument, the argument is now |
4680 | in the stack. | |
51bbfa0c | 4681 | |
841404cd AO |
4682 | ??? Unlike the case above, in which we want the actual |
4683 | address of the data, so that we can load it directly into a | |
4684 | register, here we want the address of the stack slot, so that | |
4685 | it's properly aligned for word-by-word copying or something | |
4686 | like that. It's not clear that this is always correct. */ | |
4687 | if (partial == 0) | |
4688 | arg->value = arg->stack_slot; | |
4689 | } | |
8df3dbb7 RH |
4690 | |
4691 | if (arg->reg && GET_CODE (arg->reg) == PARALLEL) | |
4692 | { | |
4693 | tree type = TREE_TYPE (arg->tree_value); | |
4694 | arg->parallel_value | |
4695 | = emit_group_load_into_temps (arg->reg, arg->value, type, | |
4696 | int_size_in_bytes (type)); | |
4697 | } | |
51bbfa0c | 4698 | |
8403445a AM |
4699 | /* Mark all slots this store used. */ |
4700 | if (ACCUMULATE_OUTGOING_ARGS && !(flags & ECF_SIBCALL) | |
4701 | && argblock && ! variable_size && arg->stack) | |
4702 | for (i = lower_bound; i < upper_bound; i++) | |
4703 | stack_usage_map[i] = 1; | |
4704 | ||
51bbfa0c RS |
4705 | /* Once we have pushed something, pops can't safely |
4706 | be deferred during the rest of the arguments. */ | |
4707 | NO_DEFER_POP; | |
4708 | ||
9474e8ab | 4709 | /* Free any temporary slots made in processing this argument. */ |
cc79451b | 4710 | pop_temp_slots (); |
4c6b3b2a JJ |
4711 | |
4712 | return sibcall_failure; | |
51bbfa0c | 4713 | } |
a4b1b92a | 4714 | |
fe984136 | 4715 | /* Nonzero if we do not know how to pass TYPE solely in registers. */ |
a4b1b92a | 4716 | |
fe984136 RH |
4717 | bool |
4718 | must_pass_in_stack_var_size (enum machine_mode mode ATTRIBUTE_UNUSED, | |
586de218 | 4719 | const_tree type) |
fe984136 RH |
4720 | { |
4721 | if (!type) | |
4722 | return false; | |
4723 | ||
4724 | /* If the type has variable size... */ | |
4725 | if (TREE_CODE (TYPE_SIZE (type)) != INTEGER_CST) | |
4726 | return true; | |
a4b1b92a | 4727 | |
fe984136 RH |
4728 | /* If the type is marked as addressable (it is required |
4729 | to be constructed into the stack)... */ | |
4730 | if (TREE_ADDRESSABLE (type)) | |
4731 | return true; | |
4732 | ||
4733 | return false; | |
4734 | } | |
a4b1b92a | 4735 | |
7ae4ad28 | 4736 | /* Another version of the TARGET_MUST_PASS_IN_STACK hook. This one |
fe984136 RH |
4737 | takes trailing padding of a structure into account. */ |
4738 | /* ??? Should be able to merge these two by examining BLOCK_REG_PADDING. */ | |
a4b1b92a RH |
4739 | |
4740 | bool | |
586de218 | 4741 | must_pass_in_stack_var_size_or_pad (enum machine_mode mode, const_tree type) |
a4b1b92a RH |
4742 | { |
4743 | if (!type) | |
40cdfd5a | 4744 | return false; |
a4b1b92a RH |
4745 | |
4746 | /* If the type has variable size... */ | |
4747 | if (TREE_CODE (TYPE_SIZE (type)) != INTEGER_CST) | |
4748 | return true; | |
4749 | ||
4750 | /* If the type is marked as addressable (it is required | |
4751 | to be constructed into the stack)... */ | |
4752 | if (TREE_ADDRESSABLE (type)) | |
4753 | return true; | |
4754 | ||
4755 | /* If the padding and mode of the type is such that a copy into | |
4756 | a register would put it into the wrong part of the register. */ | |
4757 | if (mode == BLKmode | |
4758 | && int_size_in_bytes (type) % (PARM_BOUNDARY / BITS_PER_UNIT) | |
4759 | && (FUNCTION_ARG_PADDING (mode, type) | |
4760 | == (BYTES_BIG_ENDIAN ? upward : downward))) | |
4761 | return true; | |
4762 | ||
4763 | return false; | |
4764 | } |