]>
Commit | Line | Data |
---|---|---|
51bbfa0c | 1 | /* Convert function calls to rtl insns, for GNU C compiler. |
3c71940f | 2 | Copyright (C) 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998 |
b820d2b8 | 3 | 1999, 2000, 2001, 2002, 2003 Free Software Foundation, Inc. |
51bbfa0c | 4 | |
1322177d | 5 | This file is part of GCC. |
51bbfa0c | 6 | |
1322177d LB |
7 | GCC is free software; you can redistribute it and/or modify it under |
8 | the terms of the GNU General Public License as published by the Free | |
9 | Software Foundation; either version 2, or (at your option) any later | |
10 | version. | |
51bbfa0c | 11 | |
1322177d LB |
12 | GCC is distributed in the hope that it will be useful, but WITHOUT ANY |
13 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
14 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
15 | for more details. | |
51bbfa0c RS |
16 | |
17 | You should have received a copy of the GNU General Public License | |
1322177d LB |
18 | along with GCC; see the file COPYING. If not, write to the Free |
19 | Software Foundation, 59 Temple Place - Suite 330, Boston, MA | |
20 | 02111-1307, USA. */ | |
51bbfa0c RS |
21 | |
22 | #include "config.h" | |
670ee920 | 23 | #include "system.h" |
4977bab6 ZW |
24 | #include "coretypes.h" |
25 | #include "tm.h" | |
670ee920 KG |
26 | #include "rtl.h" |
27 | #include "tree.h" | |
28 | #include "flags.h" | |
29 | #include "expr.h" | |
e78d8e51 | 30 | #include "libfuncs.h" |
49ad7cfa | 31 | #include "function.h" |
670ee920 | 32 | #include "regs.h" |
5f6da302 | 33 | #include "toplev.h" |
d6f4ec51 | 34 | #include "output.h" |
b1474bb7 | 35 | #include "tm_p.h" |
ea11ca7e | 36 | #include "timevar.h" |
c67846f2 | 37 | #include "sbitmap.h" |
b0c48229 | 38 | #include "langhooks.h" |
23626154 | 39 | #include "target.h" |
b255a036 | 40 | #include "cgraph.h" |
b2dd096b | 41 | #include "except.h" |
51bbfa0c RS |
42 | |
43 | /* Decide whether a function's arguments should be processed | |
bbc8a071 RK |
44 | from first to last or from last to first. |
45 | ||
46 | They should if the stack and args grow in opposite directions, but | |
47 | only if we have push insns. */ | |
51bbfa0c | 48 | |
51bbfa0c | 49 | #ifdef PUSH_ROUNDING |
bbc8a071 | 50 | |
2da4124d | 51 | #ifndef PUSH_ARGS_REVERSED |
40083ddf | 52 | #if defined (STACK_GROWS_DOWNWARD) != defined (ARGS_GROW_DOWNWARD) |
f73ad30e | 53 | #define PUSH_ARGS_REVERSED PUSH_ARGS |
51bbfa0c | 54 | #endif |
2da4124d | 55 | #endif |
bbc8a071 | 56 | |
51bbfa0c RS |
57 | #endif |
58 | ||
f73ad30e JH |
59 | #ifndef PUSH_ARGS_REVERSED |
60 | #define PUSH_ARGS_REVERSED 0 | |
61 | #endif | |
62 | ||
c39ada04 DD |
63 | #ifndef STACK_POINTER_OFFSET |
64 | #define STACK_POINTER_OFFSET 0 | |
65 | #endif | |
66 | ||
c795bca9 BS |
67 | /* Like PREFERRED_STACK_BOUNDARY but in units of bytes, not bits. */ |
68 | #define STACK_BYTES (PREFERRED_STACK_BOUNDARY / BITS_PER_UNIT) | |
51bbfa0c RS |
69 | |
70 | /* Data structure and subroutines used within expand_call. */ | |
71 | ||
72 | struct arg_data | |
73 | { | |
74 | /* Tree node for this argument. */ | |
75 | tree tree_value; | |
1efe6448 RK |
76 | /* Mode for value; TYPE_MODE unless promoted. */ |
77 | enum machine_mode mode; | |
51bbfa0c RS |
78 | /* Current RTL value for argument, or 0 if it isn't precomputed. */ |
79 | rtx value; | |
80 | /* Initially-compute RTL value for argument; only for const functions. */ | |
81 | rtx initial_value; | |
82 | /* Register to pass this argument in, 0 if passed on stack, or an | |
cacbd532 | 83 | PARALLEL if the arg is to be copied into multiple non-contiguous |
51bbfa0c RS |
84 | registers. */ |
85 | rtx reg; | |
099e9712 JH |
86 | /* Register to pass this argument in when generating tail call sequence. |
87 | This is not the same register as for normal calls on machines with | |
88 | register windows. */ | |
89 | rtx tail_call_reg; | |
84b55618 RK |
90 | /* If REG was promoted from the actual mode of the argument expression, |
91 | indicates whether the promotion is sign- or zero-extended. */ | |
92 | int unsignedp; | |
51bbfa0c RS |
93 | /* Number of registers to use. 0 means put the whole arg in registers. |
94 | Also 0 if not passed in registers. */ | |
95 | int partial; | |
da7d8304 | 96 | /* Nonzero if argument must be passed on stack. |
d64f5a78 RS |
97 | Note that some arguments may be passed on the stack |
98 | even though pass_on_stack is zero, just because FUNCTION_ARG says so. | |
99 | pass_on_stack identifies arguments that *cannot* go in registers. */ | |
51bbfa0c | 100 | int pass_on_stack; |
e7949876 AM |
101 | /* Some fields packaged up for locate_and_pad_parm. */ |
102 | struct locate_and_pad_arg_data locate; | |
51bbfa0c RS |
103 | /* Location on the stack at which parameter should be stored. The store |
104 | has already been done if STACK == VALUE. */ | |
105 | rtx stack; | |
106 | /* Location on the stack of the start of this argument slot. This can | |
107 | differ from STACK if this arg pads downward. This location is known | |
108 | to be aligned to FUNCTION_ARG_BOUNDARY. */ | |
109 | rtx stack_slot; | |
51bbfa0c RS |
110 | /* Place that this stack area has been saved, if needed. */ |
111 | rtx save_area; | |
4ab56118 RK |
112 | /* If an argument's alignment does not permit direct copying into registers, |
113 | copy in smaller-sized pieces into pseudos. These are stored in a | |
114 | block pointed to by this field. The next field says how many | |
115 | word-sized pseudos we made. */ | |
116 | rtx *aligned_regs; | |
117 | int n_aligned_regs; | |
51bbfa0c RS |
118 | }; |
119 | ||
da7d8304 | 120 | /* A vector of one char per byte of stack space. A byte if nonzero if |
51bbfa0c RS |
121 | the corresponding stack location has been used. |
122 | This vector is used to prevent a function call within an argument from | |
123 | clobbering any stack already set up. */ | |
124 | static char *stack_usage_map; | |
125 | ||
126 | /* Size of STACK_USAGE_MAP. */ | |
127 | static int highest_outgoing_arg_in_use; | |
2f4aa534 | 128 | |
c67846f2 JJ |
129 | /* A bitmap of virtual-incoming stack space. Bit is set if the corresponding |
130 | stack location's tail call argument has been already stored into the stack. | |
131 | This bitmap is used to prevent sibling call optimization if function tries | |
132 | to use parent's incoming argument slots when they have been already | |
133 | overwritten with tail call arguments. */ | |
134 | static sbitmap stored_args_map; | |
135 | ||
2f4aa534 RS |
136 | /* stack_arg_under_construction is nonzero when an argument may be |
137 | initialized with a constructor call (including a C function that | |
138 | returns a BLKmode struct) and expand_call must take special action | |
139 | to make sure the object being constructed does not overlap the | |
140 | argument list for the constructor call. */ | |
141 | int stack_arg_under_construction; | |
51bbfa0c | 142 | |
3d994c6b KG |
143 | static int calls_function PARAMS ((tree, int)); |
144 | static int calls_function_1 PARAMS ((tree, int)); | |
0a1c58a2 | 145 | |
3d994c6b KG |
146 | static void emit_call_1 PARAMS ((rtx, tree, tree, HOST_WIDE_INT, |
147 | HOST_WIDE_INT, HOST_WIDE_INT, rtx, | |
fa5322fa AO |
148 | rtx, int, rtx, int, |
149 | CUMULATIVE_ARGS *)); | |
3d994c6b KG |
150 | static void precompute_register_parameters PARAMS ((int, |
151 | struct arg_data *, | |
152 | int *)); | |
4c6b3b2a | 153 | static int store_one_arg PARAMS ((struct arg_data *, rtx, int, int, |
3d994c6b KG |
154 | int)); |
155 | static void store_unaligned_arguments_into_pseudos PARAMS ((struct arg_data *, | |
156 | int)); | |
157 | static int finalize_must_preallocate PARAMS ((int, int, | |
158 | struct arg_data *, | |
159 | struct args_size *)); | |
40d6e956 JH |
160 | static void precompute_arguments PARAMS ((int, int, |
161 | struct arg_data *)); | |
f725a3ec | 162 | static int compute_argument_block_size PARAMS ((int, |
c2f8b491 JH |
163 | struct args_size *, |
164 | int)); | |
3d994c6b KG |
165 | static void initialize_argument_information PARAMS ((int, |
166 | struct arg_data *, | |
167 | struct args_size *, | |
168 | int, tree, tree, | |
169 | CUMULATIVE_ARGS *, | |
170 | int, rtx *, int *, | |
f2d33f13 | 171 | int *, int *)); |
3d994c6b KG |
172 | static void compute_argument_addresses PARAMS ((struct arg_data *, |
173 | rtx, int)); | |
174 | static rtx rtx_for_function_call PARAMS ((tree, tree)); | |
175 | static void load_register_parameters PARAMS ((struct arg_data *, | |
0cdca92b DJ |
176 | int, rtx *, int, |
177 | int, int *)); | |
ebb1b59a BS |
178 | static rtx emit_library_call_value_1 PARAMS ((int, rtx, rtx, |
179 | enum libcall_type, | |
de76b467 JH |
180 | enum machine_mode, |
181 | int, va_list)); | |
f2d33f13 | 182 | static int special_function_p PARAMS ((tree, int)); |
f2d33f13 JH |
183 | static rtx try_to_integrate PARAMS ((tree, tree, rtx, |
184 | int, tree, rtx)); | |
c67846f2 | 185 | static int check_sibcall_argument_overlap_1 PARAMS ((rtx)); |
0cdca92b DJ |
186 | static int check_sibcall_argument_overlap PARAMS ((rtx, struct arg_data *, |
187 | int)); | |
c67846f2 | 188 | |
ce48579b | 189 | static int combine_pending_stack_adjustment_and_call |
739fb049 | 190 | PARAMS ((int, struct args_size *, int)); |
1f5b3282 | 191 | static tree fix_unsafe_tree PARAMS ((tree)); |
21a3b983 | 192 | |
f73ad30e | 193 | #ifdef REG_PARM_STACK_SPACE |
3d994c6b KG |
194 | static rtx save_fixed_argument_area PARAMS ((int, rtx, int *, int *)); |
195 | static void restore_fixed_argument_area PARAMS ((rtx, rtx, int, int)); | |
20efdf74 | 196 | #endif |
51bbfa0c | 197 | \f |
1ce0cb53 JW |
198 | /* If WHICH is 1, return 1 if EXP contains a call to the built-in function |
199 | `alloca'. | |
200 | ||
201 | If WHICH is 0, return 1 if EXP contains a call to any function. | |
202 | Actually, we only need return 1 if evaluating EXP would require pushing | |
203 | arguments on the stack, but that is too difficult to compute, so we just | |
204 | assume any function call might require the stack. */ | |
51bbfa0c | 205 | |
1c8d7aef RS |
206 | static tree calls_function_save_exprs; |
207 | ||
51bbfa0c | 208 | static int |
1ce0cb53 | 209 | calls_function (exp, which) |
51bbfa0c | 210 | tree exp; |
1ce0cb53 | 211 | int which; |
1c8d7aef RS |
212 | { |
213 | int val; | |
8d5e6e25 | 214 | |
1c8d7aef RS |
215 | calls_function_save_exprs = 0; |
216 | val = calls_function_1 (exp, which); | |
217 | calls_function_save_exprs = 0; | |
218 | return val; | |
219 | } | |
220 | ||
8d5e6e25 RK |
221 | /* Recursive function to do the work of above function. */ |
222 | ||
1c8d7aef RS |
223 | static int |
224 | calls_function_1 (exp, which) | |
225 | tree exp; | |
226 | int which; | |
51bbfa0c | 227 | { |
b3694847 | 228 | int i; |
0207efa2 | 229 | enum tree_code code = TREE_CODE (exp); |
8d5e6e25 RK |
230 | int class = TREE_CODE_CLASS (code); |
231 | int length = first_rtl_op (code); | |
51bbfa0c | 232 | |
ddd5a7c1 | 233 | /* If this code is language-specific, we don't know what it will do. */ |
0207efa2 RK |
234 | if ((int) code >= NUM_TREE_CODES) |
235 | return 1; | |
51bbfa0c | 236 | |
0207efa2 | 237 | switch (code) |
51bbfa0c RS |
238 | { |
239 | case CALL_EXPR: | |
1ce0cb53 JW |
240 | if (which == 0) |
241 | return 1; | |
43db0363 RK |
242 | else if ((TREE_CODE (TREE_TYPE (TREE_TYPE (TREE_OPERAND (exp, 0)))) |
243 | == FUNCTION_TYPE) | |
244 | && (TYPE_RETURNS_STACK_DEPRESSED | |
245 | (TREE_TYPE (TREE_TYPE (TREE_OPERAND (exp, 0)))))) | |
7393c642 | 246 | return 1; |
1ce0cb53 JW |
247 | else if (TREE_CODE (TREE_OPERAND (exp, 0)) == ADDR_EXPR |
248 | && (TREE_CODE (TREE_OPERAND (TREE_OPERAND (exp, 0), 0)) | |
8d5e6e25 RK |
249 | == FUNCTION_DECL) |
250 | && (special_function_p (TREE_OPERAND (TREE_OPERAND (exp, 0), 0), | |
251 | 0) | |
252 | & ECF_MAY_BE_ALLOCA)) | |
253 | return 1; | |
51bbfa0c | 254 | |
51bbfa0c RS |
255 | break; |
256 | ||
b367c416 RK |
257 | case CONSTRUCTOR: |
258 | { | |
259 | tree tem; | |
260 | ||
261 | for (tem = CONSTRUCTOR_ELTS (exp); tem != 0; tem = TREE_CHAIN (tem)) | |
262 | if (calls_function_1 (TREE_VALUE (tem), which)) | |
263 | return 1; | |
264 | } | |
265 | ||
266 | return 0; | |
267 | ||
51bbfa0c RS |
268 | case SAVE_EXPR: |
269 | if (SAVE_EXPR_RTL (exp) != 0) | |
270 | return 0; | |
1c8d7aef RS |
271 | if (value_member (exp, calls_function_save_exprs)) |
272 | return 0; | |
273 | calls_function_save_exprs = tree_cons (NULL_TREE, exp, | |
274 | calls_function_save_exprs); | |
275 | return (TREE_OPERAND (exp, 0) != 0 | |
276 | && calls_function_1 (TREE_OPERAND (exp, 0), which)); | |
51bbfa0c RS |
277 | |
278 | case BLOCK: | |
ef03bc85 | 279 | { |
b3694847 SS |
280 | tree local; |
281 | tree subblock; | |
ef03bc85 CH |
282 | |
283 | for (local = BLOCK_VARS (exp); local; local = TREE_CHAIN (local)) | |
1ce0cb53 | 284 | if (DECL_INITIAL (local) != 0 |
1c8d7aef | 285 | && calls_function_1 (DECL_INITIAL (local), which)) |
ef03bc85 | 286 | return 1; |
ef03bc85 CH |
287 | |
288 | for (subblock = BLOCK_SUBBLOCKS (exp); | |
289 | subblock; | |
290 | subblock = TREE_CHAIN (subblock)) | |
1c8d7aef | 291 | if (calls_function_1 (subblock, which)) |
ef03bc85 CH |
292 | return 1; |
293 | } | |
294 | return 0; | |
8d5e6e25 | 295 | |
0c4c16df JH |
296 | case TREE_LIST: |
297 | for (; exp != 0; exp = TREE_CHAIN (exp)) | |
298 | if (calls_function_1 (TREE_VALUE (exp), which)) | |
299 | return 1; | |
300 | return 0; | |
51bbfa0c | 301 | |
e9a25f70 JL |
302 | default: |
303 | break; | |
51bbfa0c RS |
304 | } |
305 | ||
8d5e6e25 RK |
306 | /* Only expressions, references, and blocks can contain calls. */ |
307 | if (! IS_EXPR_CODE_CLASS (class) && class != 'r' && class != 'b') | |
0c4c16df JH |
308 | return 0; |
309 | ||
51bbfa0c RS |
310 | for (i = 0; i < length; i++) |
311 | if (TREE_OPERAND (exp, i) != 0 | |
1c8d7aef | 312 | && calls_function_1 (TREE_OPERAND (exp, i), which)) |
51bbfa0c RS |
313 | return 1; |
314 | ||
315 | return 0; | |
316 | } | |
317 | \f | |
318 | /* Force FUNEXP into a form suitable for the address of a CALL, | |
319 | and return that as an rtx. Also load the static chain register | |
320 | if FNDECL is a nested function. | |
321 | ||
77cac2f2 RK |
322 | CALL_FUSAGE points to a variable holding the prospective |
323 | CALL_INSN_FUNCTION_USAGE information. */ | |
51bbfa0c | 324 | |
03dacb02 | 325 | rtx |
3affaf29 | 326 | prepare_call_address (funexp, fndecl, call_fusage, reg_parm_seen, sibcallp) |
51bbfa0c RS |
327 | rtx funexp; |
328 | tree fndecl; | |
77cac2f2 | 329 | rtx *call_fusage; |
01368078 | 330 | int reg_parm_seen; |
3affaf29 | 331 | int sibcallp; |
51bbfa0c RS |
332 | { |
333 | rtx static_chain_value = 0; | |
334 | ||
335 | funexp = protect_from_queue (funexp, 0); | |
336 | ||
337 | if (fndecl != 0) | |
0f41302f | 338 | /* Get possible static chain value for nested function in C. */ |
51bbfa0c RS |
339 | static_chain_value = lookup_static_chain (fndecl); |
340 | ||
341 | /* Make a valid memory address and copy constants thru pseudo-regs, | |
342 | but not for a constant address if -fno-function-cse. */ | |
343 | if (GET_CODE (funexp) != SYMBOL_REF) | |
01368078 | 344 | /* If we are using registers for parameters, force the |
e9a25f70 JL |
345 | function address into a register now. */ |
346 | funexp = ((SMALL_REGISTER_CLASSES && reg_parm_seen) | |
347 | ? force_not_mem (memory_address (FUNCTION_MODE, funexp)) | |
348 | : memory_address (FUNCTION_MODE, funexp)); | |
3affaf29 | 349 | else if (! sibcallp) |
51bbfa0c RS |
350 | { |
351 | #ifndef NO_FUNCTION_CSE | |
352 | if (optimize && ! flag_no_function_cse) | |
353 | #ifdef NO_RECURSIVE_FUNCTION_CSE | |
354 | if (fndecl != current_function_decl) | |
355 | #endif | |
356 | funexp = force_reg (Pmode, funexp); | |
357 | #endif | |
358 | } | |
359 | ||
360 | if (static_chain_value != 0) | |
361 | { | |
362 | emit_move_insn (static_chain_rtx, static_chain_value); | |
363 | ||
f991a240 RK |
364 | if (GET_CODE (static_chain_rtx) == REG) |
365 | use_reg (call_fusage, static_chain_rtx); | |
51bbfa0c RS |
366 | } |
367 | ||
368 | return funexp; | |
369 | } | |
370 | ||
371 | /* Generate instructions to call function FUNEXP, | |
372 | and optionally pop the results. | |
373 | The CALL_INSN is the first insn generated. | |
374 | ||
607ea900 | 375 | FNDECL is the declaration node of the function. This is given to the |
2c8da025 RK |
376 | macro RETURN_POPS_ARGS to determine whether this function pops its own args. |
377 | ||
334c4f0f RK |
378 | FUNTYPE is the data type of the function. This is given to the macro |
379 | RETURN_POPS_ARGS to determine whether this function pops its own args. | |
380 | We used to allow an identifier for library functions, but that doesn't | |
381 | work when the return type is an aggregate type and the calling convention | |
382 | says that the pointer to this aggregate is to be popped by the callee. | |
51bbfa0c RS |
383 | |
384 | STACK_SIZE is the number of bytes of arguments on the stack, | |
c2732da3 JM |
385 | ROUNDED_STACK_SIZE is that number rounded up to |
386 | PREFERRED_STACK_BOUNDARY; zero if the size is variable. This is | |
387 | both to put into the call insn and to generate explicit popping | |
388 | code if necessary. | |
51bbfa0c RS |
389 | |
390 | STRUCT_VALUE_SIZE is the number of bytes wanted in a structure value. | |
391 | It is zero if this call doesn't want a structure value. | |
392 | ||
393 | NEXT_ARG_REG is the rtx that results from executing | |
394 | FUNCTION_ARG (args_so_far, VOIDmode, void_type_node, 1) | |
395 | just after all the args have had their registers assigned. | |
396 | This could be whatever you like, but normally it is the first | |
397 | arg-register beyond those used for args in this call, | |
398 | or 0 if all the arg-registers are used in this call. | |
399 | It is passed on to `gen_call' so you can put this info in the call insn. | |
400 | ||
401 | VALREG is a hard register in which a value is returned, | |
402 | or 0 if the call does not return a value. | |
403 | ||
404 | OLD_INHIBIT_DEFER_POP is the value that `inhibit_defer_pop' had before | |
405 | the args to this call were processed. | |
406 | We restore `inhibit_defer_pop' to that value. | |
407 | ||
94b25f81 | 408 | CALL_FUSAGE is either empty or an EXPR_LIST of USE expressions that |
6d2f8887 | 409 | denote registers used by the called function. */ |
f725a3ec | 410 | |
322e3e34 | 411 | static void |
fb5eebb9 RH |
412 | emit_call_1 (funexp, fndecl, funtype, stack_size, rounded_stack_size, |
413 | struct_value_size, next_arg_reg, valreg, old_inhibit_defer_pop, | |
fa5322fa | 414 | call_fusage, ecf_flags, args_so_far) |
51bbfa0c | 415 | rtx funexp; |
c84e2712 KG |
416 | tree fndecl ATTRIBUTE_UNUSED; |
417 | tree funtype ATTRIBUTE_UNUSED; | |
6a651371 | 418 | HOST_WIDE_INT stack_size ATTRIBUTE_UNUSED; |
fb5eebb9 | 419 | HOST_WIDE_INT rounded_stack_size; |
962f1324 | 420 | HOST_WIDE_INT struct_value_size ATTRIBUTE_UNUSED; |
6894579f | 421 | rtx next_arg_reg ATTRIBUTE_UNUSED; |
51bbfa0c RS |
422 | rtx valreg; |
423 | int old_inhibit_defer_pop; | |
77cac2f2 | 424 | rtx call_fusage; |
0a1c58a2 | 425 | int ecf_flags; |
fa5322fa | 426 | CUMULATIVE_ARGS *args_so_far ATTRIBUTE_UNUSED; |
51bbfa0c | 427 | { |
062e7fd8 | 428 | rtx rounded_stack_size_rtx = GEN_INT (rounded_stack_size); |
51bbfa0c RS |
429 | rtx call_insn; |
430 | int already_popped = 0; | |
fb5eebb9 | 431 | HOST_WIDE_INT n_popped = RETURN_POPS_ARGS (fndecl, funtype, stack_size); |
f45c9d95 ZW |
432 | #if defined (HAVE_call) && defined (HAVE_call_value) |
433 | rtx struct_value_size_rtx; | |
434 | struct_value_size_rtx = GEN_INT (struct_value_size); | |
435 | #endif | |
51bbfa0c | 436 | |
fa5322fa AO |
437 | #ifdef CALL_POPS_ARGS |
438 | n_popped += CALL_POPS_ARGS (* args_so_far); | |
439 | #endif | |
440 | ||
51bbfa0c RS |
441 | /* Ensure address is valid. SYMBOL_REF is already valid, so no need, |
442 | and we don't want to load it into a register as an optimization, | |
443 | because prepare_call_address already did it if it should be done. */ | |
444 | if (GET_CODE (funexp) != SYMBOL_REF) | |
445 | funexp = memory_address (FUNCTION_MODE, funexp); | |
446 | ||
0a1c58a2 JL |
447 | #if defined (HAVE_sibcall_pop) && defined (HAVE_sibcall_value_pop) |
448 | if ((ecf_flags & ECF_SIBCALL) | |
449 | && HAVE_sibcall_pop && HAVE_sibcall_value_pop | |
f132f529 | 450 | && (n_popped > 0 || stack_size == 0)) |
0a1c58a2 | 451 | { |
8ac61af7 | 452 | rtx n_pop = GEN_INT (n_popped); |
0a1c58a2 JL |
453 | rtx pat; |
454 | ||
455 | /* If this subroutine pops its own args, record that in the call insn | |
456 | if possible, for the sake of frame pointer elimination. */ | |
457 | ||
458 | if (valreg) | |
f45c9d95 | 459 | pat = GEN_SIBCALL_VALUE_POP (valreg, |
0a1c58a2 JL |
460 | gen_rtx_MEM (FUNCTION_MODE, funexp), |
461 | rounded_stack_size_rtx, next_arg_reg, | |
462 | n_pop); | |
463 | else | |
f45c9d95 | 464 | pat = GEN_SIBCALL_POP (gen_rtx_MEM (FUNCTION_MODE, funexp), |
0a1c58a2 JL |
465 | rounded_stack_size_rtx, next_arg_reg, n_pop); |
466 | ||
467 | emit_call_insn (pat); | |
468 | already_popped = 1; | |
469 | } | |
470 | else | |
471 | #endif | |
472 | ||
51bbfa0c | 473 | #if defined (HAVE_call_pop) && defined (HAVE_call_value_pop) |
8ac61af7 RK |
474 | /* If the target has "call" or "call_value" insns, then prefer them |
475 | if no arguments are actually popped. If the target does not have | |
476 | "call" or "call_value" insns, then we must use the popping versions | |
477 | even if the call has no arguments to pop. */ | |
8bcafee3 JDA |
478 | #if defined (HAVE_call) && defined (HAVE_call_value) |
479 | if (HAVE_call && HAVE_call_value && HAVE_call_pop && HAVE_call_value_pop | |
7393c642 | 480 | && n_popped > 0 && ! (ecf_flags & ECF_SP_DEPRESSED)) |
8bcafee3 JDA |
481 | #else |
482 | if (HAVE_call_pop && HAVE_call_value_pop) | |
483 | #endif | |
51bbfa0c | 484 | { |
fb5eebb9 | 485 | rtx n_pop = GEN_INT (n_popped); |
51bbfa0c RS |
486 | rtx pat; |
487 | ||
488 | /* If this subroutine pops its own args, record that in the call insn | |
489 | if possible, for the sake of frame pointer elimination. */ | |
2c8da025 | 490 | |
51bbfa0c | 491 | if (valreg) |
f45c9d95 | 492 | pat = GEN_CALL_VALUE_POP (valreg, |
38a448ca | 493 | gen_rtx_MEM (FUNCTION_MODE, funexp), |
062e7fd8 | 494 | rounded_stack_size_rtx, next_arg_reg, n_pop); |
51bbfa0c | 495 | else |
f45c9d95 | 496 | pat = GEN_CALL_POP (gen_rtx_MEM (FUNCTION_MODE, funexp), |
062e7fd8 | 497 | rounded_stack_size_rtx, next_arg_reg, n_pop); |
51bbfa0c RS |
498 | |
499 | emit_call_insn (pat); | |
500 | already_popped = 1; | |
501 | } | |
502 | else | |
503 | #endif | |
51bbfa0c | 504 | |
0a1c58a2 JL |
505 | #if defined (HAVE_sibcall) && defined (HAVE_sibcall_value) |
506 | if ((ecf_flags & ECF_SIBCALL) | |
507 | && HAVE_sibcall && HAVE_sibcall_value) | |
508 | { | |
509 | if (valreg) | |
f45c9d95 | 510 | emit_call_insn (GEN_SIBCALL_VALUE (valreg, |
0a1c58a2 JL |
511 | gen_rtx_MEM (FUNCTION_MODE, funexp), |
512 | rounded_stack_size_rtx, | |
513 | next_arg_reg, NULL_RTX)); | |
514 | else | |
f45c9d95 | 515 | emit_call_insn (GEN_SIBCALL (gen_rtx_MEM (FUNCTION_MODE, funexp), |
0a1c58a2 JL |
516 | rounded_stack_size_rtx, next_arg_reg, |
517 | struct_value_size_rtx)); | |
518 | } | |
519 | else | |
520 | #endif | |
521 | ||
51bbfa0c RS |
522 | #if defined (HAVE_call) && defined (HAVE_call_value) |
523 | if (HAVE_call && HAVE_call_value) | |
524 | { | |
525 | if (valreg) | |
f45c9d95 | 526 | emit_call_insn (GEN_CALL_VALUE (valreg, |
38a448ca | 527 | gen_rtx_MEM (FUNCTION_MODE, funexp), |
062e7fd8 | 528 | rounded_stack_size_rtx, next_arg_reg, |
e992302c | 529 | NULL_RTX)); |
51bbfa0c | 530 | else |
f45c9d95 | 531 | emit_call_insn (GEN_CALL (gen_rtx_MEM (FUNCTION_MODE, funexp), |
062e7fd8 | 532 | rounded_stack_size_rtx, next_arg_reg, |
51bbfa0c RS |
533 | struct_value_size_rtx)); |
534 | } | |
535 | else | |
536 | #endif | |
537 | abort (); | |
538 | ||
ee960939 OH |
539 | /* Find the call we just emitted. */ |
540 | call_insn = last_call_insn (); | |
51bbfa0c | 541 | |
2a8f6b90 JH |
542 | /* Mark memory as used for "pure" function call. */ |
543 | if (ecf_flags & ECF_PURE) | |
8ac61af7 RK |
544 | call_fusage |
545 | = gen_rtx_EXPR_LIST | |
546 | (VOIDmode, | |
547 | gen_rtx_USE (VOIDmode, | |
548 | gen_rtx_MEM (BLKmode, gen_rtx_SCRATCH (VOIDmode))), | |
549 | call_fusage); | |
2a8f6b90 | 550 | |
ee960939 OH |
551 | /* Put the register usage information there. */ |
552 | add_function_usage_to (call_insn, call_fusage); | |
51bbfa0c RS |
553 | |
554 | /* If this is a const call, then set the insn's unchanging bit. */ | |
2a8f6b90 | 555 | if (ecf_flags & (ECF_CONST | ECF_PURE)) |
24a28584 | 556 | CONST_OR_PURE_CALL_P (call_insn) = 1; |
51bbfa0c | 557 | |
12a22e76 JM |
558 | /* If this call can't throw, attach a REG_EH_REGION reg note to that |
559 | effect. */ | |
0a1c58a2 | 560 | if (ecf_flags & ECF_NOTHROW) |
54cea123 | 561 | REG_NOTES (call_insn) = gen_rtx_EXPR_LIST (REG_EH_REGION, const0_rtx, |
12a22e76 | 562 | REG_NOTES (call_insn)); |
b2dd096b MM |
563 | else |
564 | note_eh_region_may_contain_throw (); | |
12a22e76 | 565 | |
ca3920ad JW |
566 | if (ecf_flags & ECF_NORETURN) |
567 | REG_NOTES (call_insn) = gen_rtx_EXPR_LIST (REG_NORETURN, const0_rtx, | |
568 | REG_NOTES (call_insn)); | |
9d98f8f9 JH |
569 | if (ecf_flags & ECF_ALWAYS_RETURN) |
570 | REG_NOTES (call_insn) = gen_rtx_EXPR_LIST (REG_ALWAYS_RETURN, const0_rtx, | |
571 | REG_NOTES (call_insn)); | |
ca3920ad | 572 | |
570a98eb | 573 | if (ecf_flags & ECF_RETURNS_TWICE) |
9defc9b7 RH |
574 | { |
575 | REG_NOTES (call_insn) = gen_rtx_EXPR_LIST (REG_SETJMP, const0_rtx, | |
576 | REG_NOTES (call_insn)); | |
577 | current_function_calls_setjmp = 1; | |
578 | } | |
570a98eb | 579 | |
0a1c58a2 JL |
580 | SIBLING_CALL_P (call_insn) = ((ecf_flags & ECF_SIBCALL) != 0); |
581 | ||
b1e64e0d RS |
582 | /* Restore this now, so that we do defer pops for this call's args |
583 | if the context of the call as a whole permits. */ | |
584 | inhibit_defer_pop = old_inhibit_defer_pop; | |
585 | ||
fb5eebb9 | 586 | if (n_popped > 0) |
51bbfa0c RS |
587 | { |
588 | if (!already_popped) | |
e3da301d | 589 | CALL_INSN_FUNCTION_USAGE (call_insn) |
38a448ca RH |
590 | = gen_rtx_EXPR_LIST (VOIDmode, |
591 | gen_rtx_CLOBBER (VOIDmode, stack_pointer_rtx), | |
592 | CALL_INSN_FUNCTION_USAGE (call_insn)); | |
fb5eebb9 | 593 | rounded_stack_size -= n_popped; |
062e7fd8 | 594 | rounded_stack_size_rtx = GEN_INT (rounded_stack_size); |
1503a7ec | 595 | stack_pointer_delta -= n_popped; |
51bbfa0c RS |
596 | } |
597 | ||
f73ad30e | 598 | if (!ACCUMULATE_OUTGOING_ARGS) |
51bbfa0c | 599 | { |
f73ad30e JH |
600 | /* If returning from the subroutine does not automatically pop the args, |
601 | we need an instruction to pop them sooner or later. | |
602 | Perhaps do it now; perhaps just record how much space to pop later. | |
603 | ||
604 | If returning from the subroutine does pop the args, indicate that the | |
605 | stack pointer will be changed. */ | |
606 | ||
f79a65c0 | 607 | if (rounded_stack_size != 0) |
f73ad30e | 608 | { |
f79a65c0 RK |
609 | if (ecf_flags & ECF_SP_DEPRESSED) |
610 | /* Just pretend we did the pop. */ | |
611 | stack_pointer_delta -= rounded_stack_size; | |
612 | else if (flag_defer_pop && inhibit_defer_pop == 0 | |
7393c642 | 613 | && ! (ecf_flags & (ECF_CONST | ECF_PURE))) |
f73ad30e JH |
614 | pending_stack_adjust += rounded_stack_size; |
615 | else | |
616 | adjust_stack (rounded_stack_size_rtx); | |
617 | } | |
51bbfa0c | 618 | } |
f73ad30e JH |
619 | /* When we accumulate outgoing args, we must avoid any stack manipulations. |
620 | Restore the stack pointer to its original value now. Usually | |
621 | ACCUMULATE_OUTGOING_ARGS targets don't get here, but there are exceptions. | |
622 | On i386 ACCUMULATE_OUTGOING_ARGS can be enabled on demand, and | |
623 | popping variants of functions exist as well. | |
624 | ||
625 | ??? We may optimize similar to defer_pop above, but it is | |
626 | probably not worthwhile. | |
f725a3ec | 627 | |
f73ad30e JH |
628 | ??? It will be worthwhile to enable combine_stack_adjustments even for |
629 | such machines. */ | |
630 | else if (n_popped) | |
631 | anti_adjust_stack (GEN_INT (n_popped)); | |
51bbfa0c RS |
632 | } |
633 | ||
20efdf74 JL |
634 | /* Determine if the function identified by NAME and FNDECL is one with |
635 | special properties we wish to know about. | |
636 | ||
637 | For example, if the function might return more than one time (setjmp), then | |
638 | set RETURNS_TWICE to a nonzero value. | |
639 | ||
f2d33f13 | 640 | Similarly set LONGJMP for if the function is in the longjmp family. |
20efdf74 | 641 | |
20efdf74 JL |
642 | Set MAY_BE_ALLOCA for any memory allocation function that might allocate |
643 | space from the stack such as alloca. */ | |
644 | ||
f2d33f13 JH |
645 | static int |
646 | special_function_p (fndecl, flags) | |
20efdf74 | 647 | tree fndecl; |
f2d33f13 | 648 | int flags; |
20efdf74 | 649 | { |
f2d33f13 | 650 | if (! (flags & ECF_MALLOC) |
3a8c995b | 651 | && fndecl && DECL_NAME (fndecl) |
140592a0 | 652 | && IDENTIFIER_LENGTH (DECL_NAME (fndecl)) <= 17 |
20efdf74 JL |
653 | /* Exclude functions not at the file scope, or not `extern', |
654 | since they are not the magic functions we would otherwise | |
655 | think they are. */ | |
656 | && DECL_CONTEXT (fndecl) == NULL_TREE && TREE_PUBLIC (fndecl)) | |
657 | { | |
63ad61ed ZW |
658 | const char *name = IDENTIFIER_POINTER (DECL_NAME (fndecl)); |
659 | const char *tname = name; | |
20efdf74 | 660 | |
ca54603f JL |
661 | /* We assume that alloca will always be called by name. It |
662 | makes no sense to pass it as a pointer-to-function to | |
663 | anything that does not understand its behavior. */ | |
f2d33f13 JH |
664 | if (((IDENTIFIER_LENGTH (DECL_NAME (fndecl)) == 6 |
665 | && name[0] == 'a' | |
666 | && ! strcmp (name, "alloca")) | |
667 | || (IDENTIFIER_LENGTH (DECL_NAME (fndecl)) == 16 | |
668 | && name[0] == '_' | |
669 | && ! strcmp (name, "__builtin_alloca")))) | |
670 | flags |= ECF_MAY_BE_ALLOCA; | |
ca54603f | 671 | |
20efdf74 JL |
672 | /* Disregard prefix _, __ or __x. */ |
673 | if (name[0] == '_') | |
674 | { | |
675 | if (name[1] == '_' && name[2] == 'x') | |
676 | tname += 3; | |
677 | else if (name[1] == '_') | |
678 | tname += 2; | |
679 | else | |
680 | tname += 1; | |
681 | } | |
682 | ||
683 | if (tname[0] == 's') | |
684 | { | |
f2d33f13 JH |
685 | if ((tname[1] == 'e' |
686 | && (! strcmp (tname, "setjmp") | |
687 | || ! strcmp (tname, "setjmp_syscall"))) | |
688 | || (tname[1] == 'i' | |
689 | && ! strcmp (tname, "sigsetjmp")) | |
690 | || (tname[1] == 'a' | |
691 | && ! strcmp (tname, "savectx"))) | |
692 | flags |= ECF_RETURNS_TWICE; | |
693 | ||
20efdf74 JL |
694 | if (tname[1] == 'i' |
695 | && ! strcmp (tname, "siglongjmp")) | |
f2d33f13 | 696 | flags |= ECF_LONGJMP; |
20efdf74 JL |
697 | } |
698 | else if ((tname[0] == 'q' && tname[1] == 's' | |
699 | && ! strcmp (tname, "qsetjmp")) | |
700 | || (tname[0] == 'v' && tname[1] == 'f' | |
701 | && ! strcmp (tname, "vfork"))) | |
f2d33f13 | 702 | flags |= ECF_RETURNS_TWICE; |
20efdf74 JL |
703 | |
704 | else if (tname[0] == 'l' && tname[1] == 'o' | |
705 | && ! strcmp (tname, "longjmp")) | |
f2d33f13 | 706 | flags |= ECF_LONGJMP; |
fa76d9e0 JR |
707 | |
708 | else if ((tname[0] == 'f' && tname[1] == 'o' | |
709 | && ! strcmp (tname, "fork")) | |
710 | /* Linux specific: __clone. check NAME to insist on the | |
711 | leading underscores, to avoid polluting the ISO / POSIX | |
712 | namespace. */ | |
713 | || (name[0] == '_' && name[1] == '_' | |
714 | && ! strcmp (tname, "clone")) | |
715 | || (tname[0] == 'e' && tname[1] == 'x' && tname[2] == 'e' | |
716 | && tname[3] == 'c' && (tname[4] == 'l' || tname[4] == 'v') | |
717 | && (tname[5] == '\0' | |
718 | || ((tname[5] == 'p' || tname[5] == 'e') | |
719 | && tname[6] == '\0')))) | |
f2d33f13 | 720 | flags |= ECF_FORK_OR_EXEC; |
20efdf74 | 721 | } |
f2d33f13 | 722 | return flags; |
20efdf74 JL |
723 | } |
724 | ||
f2d33f13 | 725 | /* Return nonzero when tree represent call to longjmp. */ |
7393c642 | 726 | |
f2d33f13 JH |
727 | int |
728 | setjmp_call_p (fndecl) | |
729 | tree fndecl; | |
730 | { | |
731 | return special_function_p (fndecl, 0) & ECF_RETURNS_TWICE; | |
732 | } | |
733 | ||
c986baf6 JH |
734 | /* Return true when exp contains alloca call. */ |
735 | bool | |
736 | alloca_call_p (exp) | |
737 | tree exp; | |
738 | { | |
739 | if (TREE_CODE (exp) == CALL_EXPR | |
740 | && TREE_CODE (TREE_OPERAND (exp, 0)) == ADDR_EXPR | |
741 | && (TREE_CODE (TREE_OPERAND (TREE_OPERAND (exp, 0), 0)) | |
742 | == FUNCTION_DECL) | |
743 | && (special_function_p (TREE_OPERAND (TREE_OPERAND (exp, 0), 0), | |
744 | 0) & ECF_MAY_BE_ALLOCA)) | |
745 | return true; | |
746 | return false; | |
747 | } | |
748 | ||
b5cd4ed4 | 749 | /* Detect flags (function attributes) from the function decl or type node. */ |
7393c642 | 750 | |
4977bab6 | 751 | int |
f2d33f13 JH |
752 | flags_from_decl_or_type (exp) |
753 | tree exp; | |
754 | { | |
755 | int flags = 0; | |
b5cd4ed4 | 756 | tree type = exp; |
36dbb93d | 757 | |
f2d33f13 JH |
758 | if (DECL_P (exp)) |
759 | { | |
b255a036 | 760 | struct cgraph_rtl_info *i = cgraph_rtl_info (exp); |
b5cd4ed4 RK |
761 | type = TREE_TYPE (exp); |
762 | ||
36dbb93d RS |
763 | if (i) |
764 | { | |
765 | if (i->pure_function) | |
766 | flags |= ECF_PURE | ECF_LIBCALL_BLOCK; | |
767 | if (i->const_function) | |
768 | flags |= ECF_CONST | ECF_LIBCALL_BLOCK; | |
769 | } | |
b255a036 | 770 | |
f2d33f13 | 771 | /* The function exp may have the `malloc' attribute. */ |
36dbb93d | 772 | if (DECL_IS_MALLOC (exp)) |
f2d33f13 JH |
773 | flags |= ECF_MALLOC; |
774 | ||
2a8f6b90 | 775 | /* The function exp may have the `pure' attribute. */ |
36dbb93d | 776 | if (DECL_IS_PURE (exp)) |
53d4257f | 777 | flags |= ECF_PURE | ECF_LIBCALL_BLOCK; |
2a8f6b90 | 778 | |
f2d33f13 JH |
779 | if (TREE_NOTHROW (exp)) |
780 | flags |= ECF_NOTHROW; | |
781 | } | |
782 | ||
7393c642 | 783 | if (TREE_READONLY (exp) && ! TREE_THIS_VOLATILE (exp)) |
53d4257f | 784 | flags |= ECF_CONST | ECF_LIBCALL_BLOCK; |
f2d33f13 JH |
785 | |
786 | if (TREE_THIS_VOLATILE (exp)) | |
787 | flags |= ECF_NORETURN; | |
788 | ||
b5cd4ed4 RK |
789 | /* Mark if the function returns with the stack pointer depressed. We |
790 | cannot consider it pure or constant in that case. */ | |
791 | if (TREE_CODE (type) == FUNCTION_TYPE && TYPE_RETURNS_STACK_DEPRESSED (type)) | |
792 | { | |
793 | flags |= ECF_SP_DEPRESSED; | |
53d4257f | 794 | flags &= ~(ECF_PURE | ECF_CONST | ECF_LIBCALL_BLOCK); |
b5cd4ed4 RK |
795 | } |
796 | ||
f2d33f13 JH |
797 | return flags; |
798 | } | |
799 | ||
20efdf74 JL |
800 | /* Precompute all register parameters as described by ARGS, storing values |
801 | into fields within the ARGS array. | |
802 | ||
803 | NUM_ACTUALS indicates the total number elements in the ARGS array. | |
804 | ||
805 | Set REG_PARM_SEEN if we encounter a register parameter. */ | |
806 | ||
807 | static void | |
808 | precompute_register_parameters (num_actuals, args, reg_parm_seen) | |
809 | int num_actuals; | |
810 | struct arg_data *args; | |
811 | int *reg_parm_seen; | |
812 | { | |
813 | int i; | |
814 | ||
815 | *reg_parm_seen = 0; | |
816 | ||
817 | for (i = 0; i < num_actuals; i++) | |
818 | if (args[i].reg != 0 && ! args[i].pass_on_stack) | |
819 | { | |
820 | *reg_parm_seen = 1; | |
821 | ||
822 | if (args[i].value == 0) | |
823 | { | |
824 | push_temp_slots (); | |
825 | args[i].value = expand_expr (args[i].tree_value, NULL_RTX, | |
826 | VOIDmode, 0); | |
827 | preserve_temp_slots (args[i].value); | |
828 | pop_temp_slots (); | |
829 | ||
830 | /* ANSI doesn't require a sequence point here, | |
831 | but PCC has one, so this will avoid some problems. */ | |
832 | emit_queue (); | |
833 | } | |
834 | ||
fd1e5d25 RH |
835 | /* If the value is a non-legitimate constant, force it into a |
836 | pseudo now. TLS symbols sometimes need a call to resolve. */ | |
837 | if (CONSTANT_P (args[i].value) | |
838 | && !LEGITIMATE_CONSTANT_P (args[i].value)) | |
839 | args[i].value = force_reg (args[i].mode, args[i].value); | |
840 | ||
20efdf74 JL |
841 | /* If we are to promote the function arg to a wider mode, |
842 | do it now. */ | |
843 | ||
844 | if (args[i].mode != TYPE_MODE (TREE_TYPE (args[i].tree_value))) | |
845 | args[i].value | |
846 | = convert_modes (args[i].mode, | |
847 | TYPE_MODE (TREE_TYPE (args[i].tree_value)), | |
848 | args[i].value, args[i].unsignedp); | |
849 | ||
f725a3ec | 850 | /* If the value is expensive, and we are inside an appropriately |
20efdf74 JL |
851 | short loop, put the value into a pseudo and then put the pseudo |
852 | into the hard reg. | |
853 | ||
854 | For small register classes, also do this if this call uses | |
855 | register parameters. This is to avoid reload conflicts while | |
856 | loading the parameters registers. */ | |
857 | ||
858 | if ((! (GET_CODE (args[i].value) == REG | |
859 | || (GET_CODE (args[i].value) == SUBREG | |
860 | && GET_CODE (SUBREG_REG (args[i].value)) == REG))) | |
861 | && args[i].mode != BLKmode | |
b437f1a7 | 862 | && rtx_cost (args[i].value, SET) > COSTS_N_INSNS (1) |
20efdf74 JL |
863 | && ((SMALL_REGISTER_CLASSES && *reg_parm_seen) |
864 | || preserve_subexpressions_p ())) | |
865 | args[i].value = copy_to_mode_reg (args[i].mode, args[i].value); | |
866 | } | |
867 | } | |
868 | ||
f73ad30e | 869 | #ifdef REG_PARM_STACK_SPACE |
20efdf74 JL |
870 | |
871 | /* The argument list is the property of the called routine and it | |
872 | may clobber it. If the fixed area has been used for previous | |
873 | parameters, we must save and restore it. */ | |
3bdf5ad1 | 874 | |
20efdf74 JL |
875 | static rtx |
876 | save_fixed_argument_area (reg_parm_stack_space, argblock, | |
877 | low_to_save, high_to_save) | |
878 | int reg_parm_stack_space; | |
879 | rtx argblock; | |
880 | int *low_to_save; | |
881 | int *high_to_save; | |
882 | { | |
b820d2b8 AM |
883 | int low; |
884 | int high; | |
20efdf74 | 885 | |
b820d2b8 AM |
886 | /* Compute the boundary of the area that needs to be saved, if any. */ |
887 | high = reg_parm_stack_space; | |
20efdf74 | 888 | #ifdef ARGS_GROW_DOWNWARD |
b820d2b8 | 889 | high += 1; |
20efdf74 | 890 | #endif |
b820d2b8 AM |
891 | if (high > highest_outgoing_arg_in_use) |
892 | high = highest_outgoing_arg_in_use; | |
20efdf74 | 893 | |
b820d2b8 AM |
894 | for (low = 0; low < high; low++) |
895 | if (stack_usage_map[low] != 0) | |
896 | { | |
897 | int num_to_save; | |
898 | enum machine_mode save_mode; | |
899 | int delta; | |
900 | rtx stack_area; | |
901 | rtx save_area; | |
20efdf74 | 902 | |
b820d2b8 AM |
903 | while (stack_usage_map[--high] == 0) |
904 | ; | |
20efdf74 | 905 | |
b820d2b8 AM |
906 | *low_to_save = low; |
907 | *high_to_save = high; | |
908 | ||
909 | num_to_save = high - low + 1; | |
910 | save_mode = mode_for_size (num_to_save * BITS_PER_UNIT, MODE_INT, 1); | |
20efdf74 | 911 | |
b820d2b8 AM |
912 | /* If we don't have the required alignment, must do this |
913 | in BLKmode. */ | |
914 | if ((low & (MIN (GET_MODE_SIZE (save_mode), | |
915 | BIGGEST_ALIGNMENT / UNITS_PER_WORD) - 1))) | |
916 | save_mode = BLKmode; | |
20efdf74 JL |
917 | |
918 | #ifdef ARGS_GROW_DOWNWARD | |
b820d2b8 | 919 | delta = -high; |
20efdf74 | 920 | #else |
b820d2b8 | 921 | delta = low; |
20efdf74 | 922 | #endif |
b820d2b8 AM |
923 | stack_area = gen_rtx_MEM (save_mode, |
924 | memory_address (save_mode, | |
925 | plus_constant (argblock, | |
926 | delta))); | |
8ac61af7 | 927 | |
b820d2b8 AM |
928 | set_mem_align (stack_area, PARM_BOUNDARY); |
929 | if (save_mode == BLKmode) | |
930 | { | |
931 | save_area = assign_stack_temp (BLKmode, num_to_save, 0); | |
932 | emit_block_move (validize_mem (save_area), stack_area, | |
933 | GEN_INT (num_to_save), BLOCK_OP_CALL_PARM); | |
934 | } | |
935 | else | |
936 | { | |
937 | save_area = gen_reg_rtx (save_mode); | |
938 | emit_move_insn (save_area, stack_area); | |
939 | } | |
8ac61af7 | 940 | |
b820d2b8 AM |
941 | return save_area; |
942 | } | |
943 | ||
944 | return NULL_RTX; | |
20efdf74 JL |
945 | } |
946 | ||
947 | static void | |
948 | restore_fixed_argument_area (save_area, argblock, high_to_save, low_to_save) | |
949 | rtx save_area; | |
950 | rtx argblock; | |
951 | int high_to_save; | |
952 | int low_to_save; | |
953 | { | |
954 | enum machine_mode save_mode = GET_MODE (save_area); | |
b820d2b8 AM |
955 | int delta; |
956 | rtx stack_area; | |
957 | ||
20efdf74 | 958 | #ifdef ARGS_GROW_DOWNWARD |
b820d2b8 | 959 | delta = -high_to_save; |
20efdf74 | 960 | #else |
b820d2b8 | 961 | delta = low_to_save; |
20efdf74 | 962 | #endif |
b820d2b8 AM |
963 | stack_area = gen_rtx_MEM (save_mode, |
964 | memory_address (save_mode, | |
965 | plus_constant (argblock, delta))); | |
966 | set_mem_align (stack_area, PARM_BOUNDARY); | |
20efdf74 JL |
967 | |
968 | if (save_mode != BLKmode) | |
969 | emit_move_insn (stack_area, save_area); | |
970 | else | |
44bb111a RH |
971 | emit_block_move (stack_area, validize_mem (save_area), |
972 | GEN_INT (high_to_save - low_to_save + 1), | |
973 | BLOCK_OP_CALL_PARM); | |
20efdf74 | 974 | } |
19652adf | 975 | #endif /* REG_PARM_STACK_SPACE */ |
f725a3ec | 976 | |
20efdf74 JL |
977 | /* If any elements in ARGS refer to parameters that are to be passed in |
978 | registers, but not in memory, and whose alignment does not permit a | |
979 | direct copy into registers. Copy the values into a group of pseudos | |
f725a3ec | 980 | which we will later copy into the appropriate hard registers. |
8e6a59fe MM |
981 | |
982 | Pseudos for each unaligned argument will be stored into the array | |
983 | args[argnum].aligned_regs. The caller is responsible for deallocating | |
984 | the aligned_regs array if it is nonzero. */ | |
985 | ||
20efdf74 JL |
986 | static void |
987 | store_unaligned_arguments_into_pseudos (args, num_actuals) | |
988 | struct arg_data *args; | |
989 | int num_actuals; | |
990 | { | |
991 | int i, j; | |
f725a3ec | 992 | |
20efdf74 JL |
993 | for (i = 0; i < num_actuals; i++) |
994 | if (args[i].reg != 0 && ! args[i].pass_on_stack | |
995 | && args[i].mode == BLKmode | |
996 | && (TYPE_ALIGN (TREE_TYPE (args[i].tree_value)) | |
997 | < (unsigned int) MIN (BIGGEST_ALIGNMENT, BITS_PER_WORD))) | |
998 | { | |
999 | int bytes = int_size_in_bytes (TREE_TYPE (args[i].tree_value)); | |
1000 | int big_endian_correction = 0; | |
1001 | ||
1002 | args[i].n_aligned_regs | |
1003 | = args[i].partial ? args[i].partial | |
1004 | : (bytes + (UNITS_PER_WORD - 1)) / UNITS_PER_WORD; | |
1005 | ||
8e6a59fe MM |
1006 | args[i].aligned_regs = (rtx *) xmalloc (sizeof (rtx) |
1007 | * args[i].n_aligned_regs); | |
20efdf74 JL |
1008 | |
1009 | /* Structures smaller than a word are aligned to the least | |
1010 | significant byte (to the right). On a BYTES_BIG_ENDIAN machine, | |
1011 | this means we must skip the empty high order bytes when | |
1012 | calculating the bit offset. */ | |
0d7839da | 1013 | if (BYTES_BIG_ENDIAN |
0d7839da | 1014 | && bytes < UNITS_PER_WORD) |
20efdf74 JL |
1015 | big_endian_correction = (BITS_PER_WORD - (bytes * BITS_PER_UNIT)); |
1016 | ||
1017 | for (j = 0; j < args[i].n_aligned_regs; j++) | |
1018 | { | |
1019 | rtx reg = gen_reg_rtx (word_mode); | |
1020 | rtx word = operand_subword_force (args[i].value, j, BLKmode); | |
1021 | int bitsize = MIN (bytes * BITS_PER_UNIT, BITS_PER_WORD); | |
20efdf74 JL |
1022 | |
1023 | args[i].aligned_regs[j] = reg; | |
1024 | ||
1025 | /* There is no need to restrict this code to loading items | |
1026 | in TYPE_ALIGN sized hunks. The bitfield instructions can | |
1027 | load up entire word sized registers efficiently. | |
1028 | ||
1029 | ??? This may not be needed anymore. | |
1030 | We use to emit a clobber here but that doesn't let later | |
1031 | passes optimize the instructions we emit. By storing 0 into | |
1032 | the register later passes know the first AND to zero out the | |
1033 | bitfield being set in the register is unnecessary. The store | |
1034 | of 0 will be deleted as will at least the first AND. */ | |
1035 | ||
1036 | emit_move_insn (reg, const0_rtx); | |
1037 | ||
1038 | bytes -= bitsize / BITS_PER_UNIT; | |
1039 | store_bit_field (reg, bitsize, big_endian_correction, word_mode, | |
19caa751 | 1040 | extract_bit_field (word, bitsize, 0, 1, NULL_RTX, |
04050c69 | 1041 | word_mode, word_mode, |
20efdf74 | 1042 | BITS_PER_WORD), |
04050c69 | 1043 | BITS_PER_WORD); |
20efdf74 JL |
1044 | } |
1045 | } | |
1046 | } | |
1047 | ||
d7cdf113 | 1048 | /* Fill in ARGS_SIZE and ARGS array based on the parameters found in |
f725a3ec | 1049 | ACTPARMS. |
d7cdf113 JL |
1050 | |
1051 | NUM_ACTUALS is the total number of parameters. | |
1052 | ||
1053 | N_NAMED_ARGS is the total number of named arguments. | |
1054 | ||
1055 | FNDECL is the tree code for the target of this call (if known) | |
1056 | ||
1057 | ARGS_SO_FAR holds state needed by the target to know where to place | |
1058 | the next argument. | |
1059 | ||
1060 | REG_PARM_STACK_SPACE is the number of bytes of stack space reserved | |
1061 | for arguments which are passed in registers. | |
1062 | ||
1063 | OLD_STACK_LEVEL is a pointer to an rtx which olds the old stack level | |
1064 | and may be modified by this routine. | |
1065 | ||
f2d33f13 | 1066 | OLD_PENDING_ADJ, MUST_PREALLOCATE and FLAGS are pointers to integer |
d7cdf113 JL |
1067 | flags which may may be modified by this routine. */ |
1068 | ||
1069 | static void | |
1070 | initialize_argument_information (num_actuals, args, args_size, n_named_args, | |
1071 | actparms, fndecl, args_so_far, | |
1072 | reg_parm_stack_space, old_stack_level, | |
f2d33f13 | 1073 | old_pending_adj, must_preallocate, |
7d167afd | 1074 | ecf_flags) |
91813b28 | 1075 | int num_actuals ATTRIBUTE_UNUSED; |
d7cdf113 JL |
1076 | struct arg_data *args; |
1077 | struct args_size *args_size; | |
91813b28 | 1078 | int n_named_args ATTRIBUTE_UNUSED; |
d7cdf113 JL |
1079 | tree actparms; |
1080 | tree fndecl; | |
959f3a06 | 1081 | CUMULATIVE_ARGS *args_so_far; |
d7cdf113 JL |
1082 | int reg_parm_stack_space; |
1083 | rtx *old_stack_level; | |
1084 | int *old_pending_adj; | |
1085 | int *must_preallocate; | |
f2d33f13 | 1086 | int *ecf_flags; |
d7cdf113 JL |
1087 | { |
1088 | /* 1 if scanning parms front to back, -1 if scanning back to front. */ | |
1089 | int inc; | |
1090 | ||
1091 | /* Count arg position in order args appear. */ | |
1092 | int argpos; | |
1093 | ||
1094 | int i; | |
1095 | tree p; | |
f725a3ec | 1096 | |
d7cdf113 JL |
1097 | args_size->constant = 0; |
1098 | args_size->var = 0; | |
1099 | ||
1100 | /* In this loop, we consider args in the order they are written. | |
1101 | We fill up ARGS from the front or from the back if necessary | |
1102 | so that in any case the first arg to be pushed ends up at the front. */ | |
1103 | ||
f73ad30e JH |
1104 | if (PUSH_ARGS_REVERSED) |
1105 | { | |
1106 | i = num_actuals - 1, inc = -1; | |
1107 | /* In this case, must reverse order of args | |
1108 | so that we compute and push the last arg first. */ | |
1109 | } | |
1110 | else | |
1111 | { | |
1112 | i = 0, inc = 1; | |
1113 | } | |
d7cdf113 JL |
1114 | |
1115 | /* I counts args in order (to be) pushed; ARGPOS counts in order written. */ | |
1116 | for (p = actparms, argpos = 0; p; p = TREE_CHAIN (p), i += inc, argpos++) | |
1117 | { | |
1118 | tree type = TREE_TYPE (TREE_VALUE (p)); | |
1119 | int unsignedp; | |
1120 | enum machine_mode mode; | |
1121 | ||
1122 | args[i].tree_value = TREE_VALUE (p); | |
1123 | ||
1124 | /* Replace erroneous argument with constant zero. */ | |
d0f062fb | 1125 | if (type == error_mark_node || !COMPLETE_TYPE_P (type)) |
d7cdf113 JL |
1126 | args[i].tree_value = integer_zero_node, type = integer_type_node; |
1127 | ||
1128 | /* If TYPE is a transparent union, pass things the way we would | |
1129 | pass the first field of the union. We have already verified that | |
1130 | the modes are the same. */ | |
2bf105ab | 1131 | if (TREE_CODE (type) == UNION_TYPE && TYPE_TRANSPARENT_UNION (type)) |
d7cdf113 JL |
1132 | type = TREE_TYPE (TYPE_FIELDS (type)); |
1133 | ||
1134 | /* Decide where to pass this arg. | |
1135 | ||
1136 | args[i].reg is nonzero if all or part is passed in registers. | |
1137 | ||
1138 | args[i].partial is nonzero if part but not all is passed in registers, | |
1139 | and the exact value says how many words are passed in registers. | |
1140 | ||
1141 | args[i].pass_on_stack is nonzero if the argument must at least be | |
1142 | computed on the stack. It may then be loaded back into registers | |
1143 | if args[i].reg is nonzero. | |
1144 | ||
1145 | These decisions are driven by the FUNCTION_... macros and must agree | |
1146 | with those made by function.c. */ | |
1147 | ||
1148 | /* See if this argument should be passed by invisible reference. */ | |
1149 | if ((TREE_CODE (TYPE_SIZE (type)) != INTEGER_CST | |
1150 | && contains_placeholder_p (TYPE_SIZE (type))) | |
1151 | || TREE_ADDRESSABLE (type) | |
1152 | #ifdef FUNCTION_ARG_PASS_BY_REFERENCE | |
959f3a06 | 1153 | || FUNCTION_ARG_PASS_BY_REFERENCE (*args_so_far, TYPE_MODE (type), |
d7cdf113 JL |
1154 | type, argpos < n_named_args) |
1155 | #endif | |
1156 | ) | |
1157 | { | |
1158 | /* If we're compiling a thunk, pass through invisible | |
1159 | references instead of making a copy. */ | |
1160 | if (current_function_is_thunk | |
1161 | #ifdef FUNCTION_ARG_CALLEE_COPIES | |
959f3a06 | 1162 | || (FUNCTION_ARG_CALLEE_COPIES (*args_so_far, TYPE_MODE (type), |
d7cdf113 JL |
1163 | type, argpos < n_named_args) |
1164 | /* If it's in a register, we must make a copy of it too. */ | |
1165 | /* ??? Is this a sufficient test? Is there a better one? */ | |
1166 | && !(TREE_CODE (args[i].tree_value) == VAR_DECL | |
1167 | && REG_P (DECL_RTL (args[i].tree_value))) | |
1168 | && ! TREE_ADDRESSABLE (type)) | |
1169 | #endif | |
1170 | ) | |
1171 | { | |
1172 | /* C++ uses a TARGET_EXPR to indicate that we want to make a | |
1173 | new object from the argument. If we are passing by | |
1174 | invisible reference, the callee will do that for us, so we | |
1175 | can strip off the TARGET_EXPR. This is not always safe, | |
1176 | but it is safe in the only case where this is a useful | |
1177 | optimization; namely, when the argument is a plain object. | |
1178 | In that case, the frontend is just asking the backend to | |
f725a3ec KH |
1179 | make a bitwise copy of the argument. */ |
1180 | ||
d7cdf113 | 1181 | if (TREE_CODE (args[i].tree_value) == TARGET_EXPR |
2f939d94 | 1182 | && (DECL_P (TREE_OPERAND (args[i].tree_value, 1))) |
d7cdf113 JL |
1183 | && ! REG_P (DECL_RTL (TREE_OPERAND (args[i].tree_value, 1)))) |
1184 | args[i].tree_value = TREE_OPERAND (args[i].tree_value, 1); | |
1185 | ||
1186 | args[i].tree_value = build1 (ADDR_EXPR, | |
1187 | build_pointer_type (type), | |
1188 | args[i].tree_value); | |
1189 | type = build_pointer_type (type); | |
1190 | } | |
f21add07 JM |
1191 | else if (TREE_CODE (args[i].tree_value) == TARGET_EXPR) |
1192 | { | |
1193 | /* In the V3 C++ ABI, parameters are destroyed in the caller. | |
1194 | We implement this by passing the address of the temporary | |
1195 | rather than expanding it into another allocated slot. */ | |
1196 | args[i].tree_value = build1 (ADDR_EXPR, | |
1197 | build_pointer_type (type), | |
1198 | args[i].tree_value); | |
1199 | type = build_pointer_type (type); | |
1200 | } | |
d7cdf113 JL |
1201 | else |
1202 | { | |
1203 | /* We make a copy of the object and pass the address to the | |
1204 | function being called. */ | |
1205 | rtx copy; | |
1206 | ||
d0f062fb | 1207 | if (!COMPLETE_TYPE_P (type) |
d7cdf113 JL |
1208 | || TREE_CODE (TYPE_SIZE (type)) != INTEGER_CST |
1209 | || (flag_stack_check && ! STACK_CHECK_BUILTIN | |
05bccae2 RK |
1210 | && (0 < compare_tree_int (TYPE_SIZE_UNIT (type), |
1211 | STACK_CHECK_MAX_VAR_SIZE)))) | |
d7cdf113 JL |
1212 | { |
1213 | /* This is a variable-sized object. Make space on the stack | |
1214 | for it. */ | |
1215 | rtx size_rtx = expr_size (TREE_VALUE (p)); | |
1216 | ||
1217 | if (*old_stack_level == 0) | |
1218 | { | |
1219 | emit_stack_save (SAVE_BLOCK, old_stack_level, NULL_RTX); | |
1220 | *old_pending_adj = pending_stack_adjust; | |
1221 | pending_stack_adjust = 0; | |
1222 | } | |
1223 | ||
1224 | copy = gen_rtx_MEM (BLKmode, | |
3bdf5ad1 RK |
1225 | allocate_dynamic_stack_space |
1226 | (size_rtx, NULL_RTX, TYPE_ALIGN (type))); | |
1227 | set_mem_attributes (copy, type, 1); | |
d7cdf113 JL |
1228 | } |
1229 | else | |
3bdf5ad1 | 1230 | copy = assign_temp (type, 0, 1, 0); |
d7cdf113 JL |
1231 | |
1232 | store_expr (args[i].tree_value, copy, 0); | |
53d4257f | 1233 | *ecf_flags &= ~(ECF_CONST | ECF_PURE | ECF_LIBCALL_BLOCK); |
d7cdf113 JL |
1234 | |
1235 | args[i].tree_value = build1 (ADDR_EXPR, | |
1236 | build_pointer_type (type), | |
1237 | make_tree (type, copy)); | |
1238 | type = build_pointer_type (type); | |
1239 | } | |
1240 | } | |
1241 | ||
1242 | mode = TYPE_MODE (type); | |
1243 | unsignedp = TREE_UNSIGNED (type); | |
1244 | ||
1245 | #ifdef PROMOTE_FUNCTION_ARGS | |
1246 | mode = promote_mode (type, mode, &unsignedp, 1); | |
1247 | #endif | |
1248 | ||
1249 | args[i].unsignedp = unsignedp; | |
1250 | args[i].mode = mode; | |
7d167afd | 1251 | |
099e9712 JH |
1252 | args[i].reg = FUNCTION_ARG (*args_so_far, mode, type, |
1253 | argpos < n_named_args); | |
7d167afd JJ |
1254 | #ifdef FUNCTION_INCOMING_ARG |
1255 | /* If this is a sibling call and the machine has register windows, the | |
1256 | register window has to be unwinded before calling the routine, so | |
1257 | arguments have to go into the incoming registers. */ | |
099e9712 | 1258 | args[i].tail_call_reg = FUNCTION_INCOMING_ARG (*args_so_far, mode, type, |
f725a3ec | 1259 | argpos < n_named_args); |
099e9712 JH |
1260 | #else |
1261 | args[i].tail_call_reg = args[i].reg; | |
7d167afd | 1262 | #endif |
7d167afd | 1263 | |
d7cdf113 JL |
1264 | #ifdef FUNCTION_ARG_PARTIAL_NREGS |
1265 | if (args[i].reg) | |
1266 | args[i].partial | |
959f3a06 | 1267 | = FUNCTION_ARG_PARTIAL_NREGS (*args_so_far, mode, type, |
d7cdf113 JL |
1268 | argpos < n_named_args); |
1269 | #endif | |
1270 | ||
1271 | args[i].pass_on_stack = MUST_PASS_IN_STACK (mode, type); | |
1272 | ||
1273 | /* If FUNCTION_ARG returned a (parallel [(expr_list (nil) ...) ...]), | |
1274 | it means that we are to pass this arg in the register(s) designated | |
1275 | by the PARALLEL, but also to pass it in the stack. */ | |
1276 | if (args[i].reg && GET_CODE (args[i].reg) == PARALLEL | |
1277 | && XEXP (XVECEXP (args[i].reg, 0, 0), 0) == 0) | |
1278 | args[i].pass_on_stack = 1; | |
1279 | ||
1280 | /* If this is an addressable type, we must preallocate the stack | |
1281 | since we must evaluate the object into its final location. | |
1282 | ||
1283 | If this is to be passed in both registers and the stack, it is simpler | |
1284 | to preallocate. */ | |
1285 | if (TREE_ADDRESSABLE (type) | |
1286 | || (args[i].pass_on_stack && args[i].reg != 0)) | |
1287 | *must_preallocate = 1; | |
1288 | ||
1289 | /* If this is an addressable type, we cannot pre-evaluate it. Thus, | |
1290 | we cannot consider this function call constant. */ | |
1291 | if (TREE_ADDRESSABLE (type)) | |
53d4257f | 1292 | *ecf_flags &= ~ECF_LIBCALL_BLOCK; |
d7cdf113 JL |
1293 | |
1294 | /* Compute the stack-size of this argument. */ | |
1295 | if (args[i].reg == 0 || args[i].partial != 0 | |
1296 | || reg_parm_stack_space > 0 | |
1297 | || args[i].pass_on_stack) | |
1298 | locate_and_pad_parm (mode, type, | |
1299 | #ifdef STACK_PARMS_IN_REG_PARM_AREA | |
1300 | 1, | |
1301 | #else | |
1302 | args[i].reg != 0, | |
1303 | #endif | |
e7949876 AM |
1304 | args[i].pass_on_stack ? 0 : args[i].partial, |
1305 | fndecl, args_size, &args[i].locate); | |
f725a3ec | 1306 | |
d7cdf113 JL |
1307 | /* Update ARGS_SIZE, the total stack space for args so far. */ |
1308 | ||
e7949876 AM |
1309 | args_size->constant += args[i].locate.size.constant; |
1310 | if (args[i].locate.size.var) | |
1311 | ADD_PARM_SIZE (*args_size, args[i].locate.size.var); | |
d7cdf113 JL |
1312 | |
1313 | /* Increment ARGS_SO_FAR, which has info about which arg-registers | |
1314 | have been used, etc. */ | |
1315 | ||
959f3a06 | 1316 | FUNCTION_ARG_ADVANCE (*args_so_far, TYPE_MODE (type), type, |
d7cdf113 JL |
1317 | argpos < n_named_args); |
1318 | } | |
1319 | } | |
1320 | ||
599f37b6 JL |
1321 | /* Update ARGS_SIZE to contain the total size for the argument block. |
1322 | Return the original constant component of the argument block's size. | |
1323 | ||
1324 | REG_PARM_STACK_SPACE holds the number of bytes of stack space reserved | |
1325 | for arguments passed in registers. */ | |
1326 | ||
1327 | static int | |
c2f8b491 | 1328 | compute_argument_block_size (reg_parm_stack_space, args_size, |
f725a3ec | 1329 | preferred_stack_boundary) |
599f37b6 JL |
1330 | int reg_parm_stack_space; |
1331 | struct args_size *args_size; | |
c2f8b491 | 1332 | int preferred_stack_boundary ATTRIBUTE_UNUSED; |
599f37b6 JL |
1333 | { |
1334 | int unadjusted_args_size = args_size->constant; | |
1335 | ||
f73ad30e JH |
1336 | /* For accumulate outgoing args mode we don't need to align, since the frame |
1337 | will be already aligned. Align to STACK_BOUNDARY in order to prevent | |
f5143c46 | 1338 | backends from generating misaligned frame sizes. */ |
f73ad30e JH |
1339 | if (ACCUMULATE_OUTGOING_ARGS && preferred_stack_boundary > STACK_BOUNDARY) |
1340 | preferred_stack_boundary = STACK_BOUNDARY; | |
f73ad30e | 1341 | |
599f37b6 JL |
1342 | /* Compute the actual size of the argument block required. The variable |
1343 | and constant sizes must be combined, the size may have to be rounded, | |
1344 | and there may be a minimum required size. */ | |
1345 | ||
1346 | if (args_size->var) | |
1347 | { | |
1348 | args_size->var = ARGS_SIZE_TREE (*args_size); | |
1349 | args_size->constant = 0; | |
1350 | ||
c2f8b491 JH |
1351 | preferred_stack_boundary /= BITS_PER_UNIT; |
1352 | if (preferred_stack_boundary > 1) | |
1503a7ec JH |
1353 | { |
1354 | /* We don't handle this case yet. To handle it correctly we have | |
f5143c46 | 1355 | to add the delta, round and subtract the delta. |
1503a7ec JH |
1356 | Currently no machine description requires this support. */ |
1357 | if (stack_pointer_delta & (preferred_stack_boundary - 1)) | |
f725a3ec | 1358 | abort (); |
1503a7ec JH |
1359 | args_size->var = round_up (args_size->var, preferred_stack_boundary); |
1360 | } | |
599f37b6 JL |
1361 | |
1362 | if (reg_parm_stack_space > 0) | |
1363 | { | |
1364 | args_size->var | |
1365 | = size_binop (MAX_EXPR, args_size->var, | |
fed3cef0 | 1366 | ssize_int (reg_parm_stack_space)); |
599f37b6 JL |
1367 | |
1368 | #ifndef OUTGOING_REG_PARM_STACK_SPACE | |
1369 | /* The area corresponding to register parameters is not to count in | |
1370 | the size of the block we need. So make the adjustment. */ | |
1371 | args_size->var | |
1372 | = size_binop (MINUS_EXPR, args_size->var, | |
fed3cef0 | 1373 | ssize_int (reg_parm_stack_space)); |
599f37b6 JL |
1374 | #endif |
1375 | } | |
1376 | } | |
1377 | else | |
1378 | { | |
c2f8b491 | 1379 | preferred_stack_boundary /= BITS_PER_UNIT; |
0a1c58a2 JL |
1380 | if (preferred_stack_boundary < 1) |
1381 | preferred_stack_boundary = 1; | |
fb5eebb9 | 1382 | args_size->constant = (((args_size->constant |
1503a7ec | 1383 | + stack_pointer_delta |
c2f8b491 JH |
1384 | + preferred_stack_boundary - 1) |
1385 | / preferred_stack_boundary | |
1386 | * preferred_stack_boundary) | |
1503a7ec | 1387 | - stack_pointer_delta); |
599f37b6 JL |
1388 | |
1389 | args_size->constant = MAX (args_size->constant, | |
1390 | reg_parm_stack_space); | |
1391 | ||
1392 | #ifdef MAYBE_REG_PARM_STACK_SPACE | |
1393 | if (reg_parm_stack_space == 0) | |
1394 | args_size->constant = 0; | |
1395 | #endif | |
1396 | ||
1397 | #ifndef OUTGOING_REG_PARM_STACK_SPACE | |
1398 | args_size->constant -= reg_parm_stack_space; | |
1399 | #endif | |
1400 | } | |
1401 | return unadjusted_args_size; | |
1402 | } | |
1403 | ||
19832c77 | 1404 | /* Precompute parameters as needed for a function call. |
cc0b1adc | 1405 | |
f2d33f13 | 1406 | FLAGS is mask of ECF_* constants. |
cc0b1adc | 1407 | |
cc0b1adc JL |
1408 | NUM_ACTUALS is the number of arguments. |
1409 | ||
f725a3ec KH |
1410 | ARGS is an array containing information for each argument; this |
1411 | routine fills in the INITIAL_VALUE and VALUE fields for each | |
1412 | precomputed argument. */ | |
cc0b1adc JL |
1413 | |
1414 | static void | |
40d6e956 | 1415 | precompute_arguments (flags, num_actuals, args) |
f2d33f13 | 1416 | int flags; |
cc0b1adc JL |
1417 | int num_actuals; |
1418 | struct arg_data *args; | |
cc0b1adc JL |
1419 | { |
1420 | int i; | |
1421 | ||
1422 | /* If this function call is cse'able, precompute all the parameters. | |
1423 | Note that if the parameter is constructed into a temporary, this will | |
1424 | cause an additional copy because the parameter will be constructed | |
1425 | into a temporary location and then copied into the outgoing arguments. | |
1426 | If a parameter contains a call to alloca and this function uses the | |
1427 | stack, precompute the parameter. */ | |
1428 | ||
1429 | /* If we preallocated the stack space, and some arguments must be passed | |
1430 | on the stack, then we must precompute any parameter which contains a | |
1431 | function call which will store arguments on the stack. | |
1432 | Otherwise, evaluating the parameter may clobber previous parameters | |
40d6e956 | 1433 | which have already been stored into the stack. (we have code to avoid |
f5143c46 | 1434 | such case by saving the outgoing stack arguments, but it results in |
40d6e956 | 1435 | worse code) */ |
cc0b1adc JL |
1436 | |
1437 | for (i = 0; i < num_actuals; i++) | |
53d4257f | 1438 | if ((flags & ECF_LIBCALL_BLOCK) |
40d6e956 | 1439 | || calls_function (args[i].tree_value, !ACCUMULATE_OUTGOING_ARGS)) |
cc0b1adc | 1440 | { |
ddef6bc7 JJ |
1441 | enum machine_mode mode; |
1442 | ||
cc0b1adc JL |
1443 | /* If this is an addressable type, we cannot pre-evaluate it. */ |
1444 | if (TREE_ADDRESSABLE (TREE_TYPE (args[i].tree_value))) | |
1445 | abort (); | |
1446 | ||
47841d1b | 1447 | args[i].value |
cc0b1adc JL |
1448 | = expand_expr (args[i].tree_value, NULL_RTX, VOIDmode, 0); |
1449 | ||
cc0b1adc JL |
1450 | /* ANSI doesn't require a sequence point here, |
1451 | but PCC has one, so this will avoid some problems. */ | |
1452 | emit_queue (); | |
1453 | ||
1454 | args[i].initial_value = args[i].value | |
47841d1b | 1455 | = protect_from_queue (args[i].value, 0); |
cc0b1adc | 1456 | |
ddef6bc7 JJ |
1457 | mode = TYPE_MODE (TREE_TYPE (args[i].tree_value)); |
1458 | if (mode != args[i].mode) | |
47841d1b JJ |
1459 | { |
1460 | args[i].value | |
ddef6bc7 | 1461 | = convert_modes (args[i].mode, mode, |
47841d1b JJ |
1462 | args[i].value, args[i].unsignedp); |
1463 | #ifdef PROMOTE_FOR_CALL_ONLY | |
1464 | /* CSE will replace this only if it contains args[i].value | |
1465 | pseudo, so convert it down to the declared mode using | |
1466 | a SUBREG. */ | |
1467 | if (GET_CODE (args[i].value) == REG | |
1468 | && GET_MODE_CLASS (args[i].mode) == MODE_INT) | |
1469 | { | |
1470 | args[i].initial_value | |
ddef6bc7 | 1471 | = gen_lowpart_SUBREG (mode, args[i].value); |
47841d1b | 1472 | SUBREG_PROMOTED_VAR_P (args[i].initial_value) = 1; |
7879b81e SE |
1473 | SUBREG_PROMOTED_UNSIGNED_SET (args[i].initial_value, |
1474 | args[i].unsignedp); | |
47841d1b JJ |
1475 | } |
1476 | #endif | |
1477 | } | |
cc0b1adc JL |
1478 | } |
1479 | } | |
1480 | ||
0f9b3ea6 JL |
1481 | /* Given the current state of MUST_PREALLOCATE and information about |
1482 | arguments to a function call in NUM_ACTUALS, ARGS and ARGS_SIZE, | |
1483 | compute and return the final value for MUST_PREALLOCATE. */ | |
1484 | ||
1485 | static int | |
1486 | finalize_must_preallocate (must_preallocate, num_actuals, args, args_size) | |
1487 | int must_preallocate; | |
1488 | int num_actuals; | |
1489 | struct arg_data *args; | |
1490 | struct args_size *args_size; | |
1491 | { | |
1492 | /* See if we have or want to preallocate stack space. | |
1493 | ||
1494 | If we would have to push a partially-in-regs parm | |
1495 | before other stack parms, preallocate stack space instead. | |
1496 | ||
1497 | If the size of some parm is not a multiple of the required stack | |
1498 | alignment, we must preallocate. | |
1499 | ||
1500 | If the total size of arguments that would otherwise create a copy in | |
1501 | a temporary (such as a CALL) is more than half the total argument list | |
1502 | size, preallocation is faster. | |
1503 | ||
1504 | Another reason to preallocate is if we have a machine (like the m88k) | |
1505 | where stack alignment is required to be maintained between every | |
1506 | pair of insns, not just when the call is made. However, we assume here | |
1507 | that such machines either do not have push insns (and hence preallocation | |
1508 | would occur anyway) or the problem is taken care of with | |
1509 | PUSH_ROUNDING. */ | |
1510 | ||
1511 | if (! must_preallocate) | |
1512 | { | |
1513 | int partial_seen = 0; | |
1514 | int copy_to_evaluate_size = 0; | |
1515 | int i; | |
1516 | ||
1517 | for (i = 0; i < num_actuals && ! must_preallocate; i++) | |
1518 | { | |
1519 | if (args[i].partial > 0 && ! args[i].pass_on_stack) | |
1520 | partial_seen = 1; | |
1521 | else if (partial_seen && args[i].reg == 0) | |
1522 | must_preallocate = 1; | |
1523 | ||
1524 | if (TYPE_MODE (TREE_TYPE (args[i].tree_value)) == BLKmode | |
1525 | && (TREE_CODE (args[i].tree_value) == CALL_EXPR | |
1526 | || TREE_CODE (args[i].tree_value) == TARGET_EXPR | |
1527 | || TREE_CODE (args[i].tree_value) == COND_EXPR | |
1528 | || TREE_ADDRESSABLE (TREE_TYPE (args[i].tree_value)))) | |
1529 | copy_to_evaluate_size | |
1530 | += int_size_in_bytes (TREE_TYPE (args[i].tree_value)); | |
1531 | } | |
1532 | ||
1533 | if (copy_to_evaluate_size * 2 >= args_size->constant | |
1534 | && args_size->constant > 0) | |
1535 | must_preallocate = 1; | |
1536 | } | |
1537 | return must_preallocate; | |
1538 | } | |
599f37b6 | 1539 | |
a45bdd02 JL |
1540 | /* If we preallocated stack space, compute the address of each argument |
1541 | and store it into the ARGS array. | |
1542 | ||
f725a3ec | 1543 | We need not ensure it is a valid memory address here; it will be |
a45bdd02 JL |
1544 | validized when it is used. |
1545 | ||
1546 | ARGBLOCK is an rtx for the address of the outgoing arguments. */ | |
1547 | ||
1548 | static void | |
1549 | compute_argument_addresses (args, argblock, num_actuals) | |
1550 | struct arg_data *args; | |
1551 | rtx argblock; | |
1552 | int num_actuals; | |
1553 | { | |
1554 | if (argblock) | |
1555 | { | |
1556 | rtx arg_reg = argblock; | |
1557 | int i, arg_offset = 0; | |
1558 | ||
1559 | if (GET_CODE (argblock) == PLUS) | |
1560 | arg_reg = XEXP (argblock, 0), arg_offset = INTVAL (XEXP (argblock, 1)); | |
1561 | ||
1562 | for (i = 0; i < num_actuals; i++) | |
1563 | { | |
e7949876 AM |
1564 | rtx offset = ARGS_SIZE_RTX (args[i].locate.offset); |
1565 | rtx slot_offset = ARGS_SIZE_RTX (args[i].locate.slot_offset); | |
a45bdd02 JL |
1566 | rtx addr; |
1567 | ||
1568 | /* Skip this parm if it will not be passed on the stack. */ | |
1569 | if (! args[i].pass_on_stack && args[i].reg != 0) | |
1570 | continue; | |
1571 | ||
1572 | if (GET_CODE (offset) == CONST_INT) | |
1573 | addr = plus_constant (arg_reg, INTVAL (offset)); | |
1574 | else | |
1575 | addr = gen_rtx_PLUS (Pmode, arg_reg, offset); | |
1576 | ||
1577 | addr = plus_constant (addr, arg_offset); | |
1578 | args[i].stack = gen_rtx_MEM (args[i].mode, addr); | |
d1a74aa7 | 1579 | set_mem_align (args[i].stack, PARM_BOUNDARY); |
3bdf5ad1 RK |
1580 | set_mem_attributes (args[i].stack, |
1581 | TREE_TYPE (args[i].tree_value), 1); | |
a45bdd02 JL |
1582 | |
1583 | if (GET_CODE (slot_offset) == CONST_INT) | |
1584 | addr = plus_constant (arg_reg, INTVAL (slot_offset)); | |
1585 | else | |
1586 | addr = gen_rtx_PLUS (Pmode, arg_reg, slot_offset); | |
1587 | ||
1588 | addr = plus_constant (addr, arg_offset); | |
1589 | args[i].stack_slot = gen_rtx_MEM (args[i].mode, addr); | |
d1a74aa7 | 1590 | set_mem_align (args[i].stack_slot, PARM_BOUNDARY); |
3bdf5ad1 RK |
1591 | set_mem_attributes (args[i].stack_slot, |
1592 | TREE_TYPE (args[i].tree_value), 1); | |
7ab923cc JJ |
1593 | |
1594 | /* Function incoming arguments may overlap with sibling call | |
1595 | outgoing arguments and we cannot allow reordering of reads | |
1596 | from function arguments with stores to outgoing arguments | |
1597 | of sibling calls. */ | |
ba4828e0 RK |
1598 | set_mem_alias_set (args[i].stack, 0); |
1599 | set_mem_alias_set (args[i].stack_slot, 0); | |
a45bdd02 JL |
1600 | } |
1601 | } | |
1602 | } | |
f725a3ec | 1603 | |
a45bdd02 JL |
1604 | /* Given a FNDECL and EXP, return an rtx suitable for use as a target address |
1605 | in a call instruction. | |
1606 | ||
1607 | FNDECL is the tree node for the target function. For an indirect call | |
1608 | FNDECL will be NULL_TREE. | |
1609 | ||
09e2bf48 | 1610 | ADDR is the operand 0 of CALL_EXPR for this call. */ |
a45bdd02 JL |
1611 | |
1612 | static rtx | |
09e2bf48 | 1613 | rtx_for_function_call (fndecl, addr) |
a45bdd02 | 1614 | tree fndecl; |
09e2bf48 | 1615 | tree addr; |
a45bdd02 JL |
1616 | { |
1617 | rtx funexp; | |
1618 | ||
1619 | /* Get the function to call, in the form of RTL. */ | |
1620 | if (fndecl) | |
1621 | { | |
1622 | /* If this is the first use of the function, see if we need to | |
1623 | make an external definition for it. */ | |
1624 | if (! TREE_USED (fndecl)) | |
1625 | { | |
1626 | assemble_external (fndecl); | |
1627 | TREE_USED (fndecl) = 1; | |
1628 | } | |
1629 | ||
1630 | /* Get a SYMBOL_REF rtx for the function address. */ | |
1631 | funexp = XEXP (DECL_RTL (fndecl), 0); | |
1632 | } | |
1633 | else | |
1634 | /* Generate an rtx (probably a pseudo-register) for the address. */ | |
1635 | { | |
1636 | push_temp_slots (); | |
09e2bf48 | 1637 | funexp = expand_expr (addr, NULL_RTX, VOIDmode, 0); |
f725a3ec | 1638 | pop_temp_slots (); /* FUNEXP can't be BLKmode. */ |
a45bdd02 JL |
1639 | emit_queue (); |
1640 | } | |
1641 | return funexp; | |
1642 | } | |
1643 | ||
21a3b983 JL |
1644 | /* Do the register loads required for any wholly-register parms or any |
1645 | parms which are passed both on the stack and in a register. Their | |
f725a3ec | 1646 | expressions were already evaluated. |
21a3b983 JL |
1647 | |
1648 | Mark all register-parms as living through the call, putting these USE | |
0cdca92b DJ |
1649 | insns in the CALL_INSN_FUNCTION_USAGE field. |
1650 | ||
1651 | When IS_SIBCALL, perform the check_sibcall_overlap_argument_overlap | |
1652 | checking, setting *SIBCALL_FAILURE if appropriate. */ | |
21a3b983 JL |
1653 | |
1654 | static void | |
0cdca92b DJ |
1655 | load_register_parameters (args, num_actuals, call_fusage, flags, |
1656 | is_sibcall, sibcall_failure) | |
21a3b983 JL |
1657 | struct arg_data *args; |
1658 | int num_actuals; | |
1659 | rtx *call_fusage; | |
099e9712 | 1660 | int flags; |
0cdca92b DJ |
1661 | int is_sibcall; |
1662 | int *sibcall_failure; | |
21a3b983 JL |
1663 | { |
1664 | int i, j; | |
1665 | ||
1666 | #ifdef LOAD_ARGS_REVERSED | |
1667 | for (i = num_actuals - 1; i >= 0; i--) | |
1668 | #else | |
1669 | for (i = 0; i < num_actuals; i++) | |
1670 | #endif | |
1671 | { | |
099e9712 JH |
1672 | rtx reg = ((flags & ECF_SIBCALL) |
1673 | ? args[i].tail_call_reg : args[i].reg); | |
21a3b983 JL |
1674 | int partial = args[i].partial; |
1675 | int nregs; | |
1676 | ||
1677 | if (reg) | |
1678 | { | |
0cdca92b | 1679 | rtx before_arg = get_last_insn (); |
21a3b983 JL |
1680 | /* Set to non-negative if must move a word at a time, even if just |
1681 | one word (e.g, partial == 1 && mode == DFmode). Set to -1 if | |
1682 | we just use a normal move insn. This value can be zero if the | |
1683 | argument is a zero size structure with no fields. */ | |
1684 | nregs = (partial ? partial | |
1685 | : (TYPE_MODE (TREE_TYPE (args[i].tree_value)) == BLKmode | |
1686 | ? ((int_size_in_bytes (TREE_TYPE (args[i].tree_value)) | |
1687 | + (UNITS_PER_WORD - 1)) / UNITS_PER_WORD) | |
1688 | : -1)); | |
1689 | ||
1690 | /* Handle calls that pass values in multiple non-contiguous | |
1691 | locations. The Irix 6 ABI has examples of this. */ | |
1692 | ||
1693 | if (GET_CODE (reg) == PARALLEL) | |
19caa751 | 1694 | emit_group_load (reg, args[i].value, |
04050c69 | 1695 | int_size_in_bytes (TREE_TYPE (args[i].tree_value))); |
21a3b983 JL |
1696 | |
1697 | /* If simple case, just do move. If normal partial, store_one_arg | |
1698 | has already loaded the register for us. In all other cases, | |
1699 | load the register(s) from memory. */ | |
1700 | ||
1701 | else if (nregs == -1) | |
1702 | emit_move_insn (reg, args[i].value); | |
1703 | ||
1704 | /* If we have pre-computed the values to put in the registers in | |
1705 | the case of non-aligned structures, copy them in now. */ | |
1706 | ||
1707 | else if (args[i].n_aligned_regs != 0) | |
1708 | for (j = 0; j < args[i].n_aligned_regs; j++) | |
1709 | emit_move_insn (gen_rtx_REG (word_mode, REGNO (reg) + j), | |
1710 | args[i].aligned_regs[j]); | |
1711 | ||
1712 | else if (partial == 0 || args[i].pass_on_stack) | |
1713 | move_block_to_reg (REGNO (reg), | |
1714 | validize_mem (args[i].value), nregs, | |
1715 | args[i].mode); | |
1716 | ||
0cdca92b DJ |
1717 | /* When a parameter is a block, and perhaps in other cases, it is |
1718 | possible that it did a load from an argument slot that was | |
32dd366d | 1719 | already clobbered. */ |
0cdca92b DJ |
1720 | if (is_sibcall |
1721 | && check_sibcall_argument_overlap (before_arg, &args[i], 0)) | |
1722 | *sibcall_failure = 1; | |
1723 | ||
21a3b983 JL |
1724 | /* Handle calls that pass values in multiple non-contiguous |
1725 | locations. The Irix 6 ABI has examples of this. */ | |
1726 | if (GET_CODE (reg) == PARALLEL) | |
1727 | use_group_regs (call_fusage, reg); | |
1728 | else if (nregs == -1) | |
1729 | use_reg (call_fusage, reg); | |
1730 | else | |
1731 | use_regs (call_fusage, REGNO (reg), nregs == 0 ? 1 : nregs); | |
1732 | } | |
1733 | } | |
1734 | } | |
1735 | ||
ea11ca7e | 1736 | /* Try to integrate function. See expand_inline_function for documentation |
f2d33f13 JH |
1737 | about the parameters. */ |
1738 | ||
1739 | static rtx | |
1740 | try_to_integrate (fndecl, actparms, target, ignore, type, structure_value_addr) | |
1741 | tree fndecl; | |
1742 | tree actparms; | |
1743 | rtx target; | |
1744 | int ignore; | |
1745 | tree type; | |
1746 | rtx structure_value_addr; | |
1747 | { | |
1748 | rtx temp; | |
1749 | rtx before_call; | |
1750 | int i; | |
1751 | rtx old_stack_level = 0; | |
7657ad0a | 1752 | int reg_parm_stack_space = 0; |
f2d33f13 JH |
1753 | |
1754 | #ifdef REG_PARM_STACK_SPACE | |
1755 | #ifdef MAYBE_REG_PARM_STACK_SPACE | |
1756 | reg_parm_stack_space = MAYBE_REG_PARM_STACK_SPACE; | |
1757 | #else | |
1758 | reg_parm_stack_space = REG_PARM_STACK_SPACE (fndecl); | |
1759 | #endif | |
1760 | #endif | |
1761 | ||
1762 | before_call = get_last_insn (); | |
1763 | ||
ea11ca7e JM |
1764 | timevar_push (TV_INTEGRATION); |
1765 | ||
f2d33f13 JH |
1766 | temp = expand_inline_function (fndecl, actparms, target, |
1767 | ignore, type, | |
1768 | structure_value_addr); | |
1769 | ||
ea11ca7e JM |
1770 | timevar_pop (TV_INTEGRATION); |
1771 | ||
f2d33f13 | 1772 | /* If inlining succeeded, return. */ |
60e8b9f0 | 1773 | if (temp != (rtx) (size_t) - 1) |
f2d33f13 JH |
1774 | { |
1775 | if (ACCUMULATE_OUTGOING_ARGS) | |
1776 | { | |
1777 | /* If the outgoing argument list must be preserved, push | |
1778 | the stack before executing the inlined function if it | |
1779 | makes any calls. */ | |
1780 | ||
546ff777 AM |
1781 | i = reg_parm_stack_space; |
1782 | if (i > highest_outgoing_arg_in_use) | |
1783 | i = highest_outgoing_arg_in_use; | |
1784 | while (--i >= 0 && stack_usage_map[i] == 0) | |
1785 | ; | |
f2d33f13 JH |
1786 | |
1787 | if (stack_arg_under_construction || i >= 0) | |
1788 | { | |
1789 | rtx first_insn | |
1790 | = before_call ? NEXT_INSN (before_call) : get_insns (); | |
1791 | rtx insn = NULL_RTX, seq; | |
1792 | ||
1793 | /* Look for a call in the inline function code. | |
1794 | If DECL_SAVED_INSNS (fndecl)->outgoing_args_size is | |
1795 | nonzero then there is a call and it is not necessary | |
1796 | to scan the insns. */ | |
1797 | ||
1798 | if (DECL_SAVED_INSNS (fndecl)->outgoing_args_size == 0) | |
1799 | for (insn = first_insn; insn; insn = NEXT_INSN (insn)) | |
1800 | if (GET_CODE (insn) == CALL_INSN) | |
1801 | break; | |
1802 | ||
1803 | if (insn) | |
1804 | { | |
1805 | /* Reserve enough stack space so that the largest | |
1806 | argument list of any function call in the inline | |
1807 | function does not overlap the argument list being | |
1808 | evaluated. This is usually an overestimate because | |
1809 | allocate_dynamic_stack_space reserves space for an | |
1810 | outgoing argument list in addition to the requested | |
1811 | space, but there is no way to ask for stack space such | |
1812 | that an argument list of a certain length can be | |
f725a3ec | 1813 | safely constructed. |
f2d33f13 JH |
1814 | |
1815 | Add the stack space reserved for register arguments, if | |
1816 | any, in the inline function. What is really needed is the | |
1817 | largest value of reg_parm_stack_space in the inline | |
1818 | function, but that is not available. Using the current | |
1819 | value of reg_parm_stack_space is wrong, but gives | |
1820 | correct results on all supported machines. */ | |
1821 | ||
1822 | int adjust = (DECL_SAVED_INSNS (fndecl)->outgoing_args_size | |
1823 | + reg_parm_stack_space); | |
1824 | ||
1825 | start_sequence (); | |
1826 | emit_stack_save (SAVE_BLOCK, &old_stack_level, NULL_RTX); | |
1827 | allocate_dynamic_stack_space (GEN_INT (adjust), | |
1828 | NULL_RTX, BITS_PER_UNIT); | |
1829 | seq = get_insns (); | |
1830 | end_sequence (); | |
2f937369 | 1831 | emit_insn_before (seq, first_insn); |
f2d33f13 JH |
1832 | emit_stack_restore (SAVE_BLOCK, old_stack_level, NULL_RTX); |
1833 | } | |
1834 | } | |
1835 | } | |
1836 | ||
1837 | /* If the result is equivalent to TARGET, return TARGET to simplify | |
1838 | checks in store_expr. They can be equivalent but not equal in the | |
1839 | case of a function that returns BLKmode. */ | |
1840 | if (temp != target && rtx_equal_p (temp, target)) | |
1841 | return target; | |
1842 | return temp; | |
1843 | } | |
1844 | ||
1845 | /* If inlining failed, mark FNDECL as needing to be compiled | |
1846 | separately after all. If function was declared inline, | |
1847 | give a warning. */ | |
1848 | if (DECL_INLINE (fndecl) && warn_inline && !flag_no_inline | |
1849 | && optimize > 0 && !TREE_ADDRESSABLE (fndecl)) | |
1850 | { | |
1851 | warning_with_decl (fndecl, "inlining failed in call to `%s'"); | |
1852 | warning ("called from here"); | |
1853 | } | |
dffd7eb6 | 1854 | (*lang_hooks.mark_addressable) (fndecl); |
60e8b9f0 | 1855 | return (rtx) (size_t) - 1; |
f2d33f13 JH |
1856 | } |
1857 | ||
739fb049 MM |
1858 | /* We need to pop PENDING_STACK_ADJUST bytes. But, if the arguments |
1859 | wouldn't fill up an even multiple of PREFERRED_UNIT_STACK_BOUNDARY | |
1860 | bytes, then we would need to push some additional bytes to pad the | |
ce48579b RH |
1861 | arguments. So, we compute an adjust to the stack pointer for an |
1862 | amount that will leave the stack under-aligned by UNADJUSTED_ARGS_SIZE | |
1863 | bytes. Then, when the arguments are pushed the stack will be perfectly | |
1864 | aligned. ARGS_SIZE->CONSTANT is set to the number of bytes that should | |
1865 | be popped after the call. Returns the adjustment. */ | |
739fb049 | 1866 | |
ce48579b | 1867 | static int |
739fb049 MM |
1868 | combine_pending_stack_adjustment_and_call (unadjusted_args_size, |
1869 | args_size, | |
1870 | preferred_unit_stack_boundary) | |
1871 | int unadjusted_args_size; | |
1872 | struct args_size *args_size; | |
1873 | int preferred_unit_stack_boundary; | |
1874 | { | |
1875 | /* The number of bytes to pop so that the stack will be | |
1876 | under-aligned by UNADJUSTED_ARGS_SIZE bytes. */ | |
1877 | HOST_WIDE_INT adjustment; | |
1878 | /* The alignment of the stack after the arguments are pushed, if we | |
1879 | just pushed the arguments without adjust the stack here. */ | |
1880 | HOST_WIDE_INT unadjusted_alignment; | |
1881 | ||
f725a3ec | 1882 | unadjusted_alignment |
739fb049 MM |
1883 | = ((stack_pointer_delta + unadjusted_args_size) |
1884 | % preferred_unit_stack_boundary); | |
1885 | ||
1886 | /* We want to get rid of as many of the PENDING_STACK_ADJUST bytes | |
1887 | as possible -- leaving just enough left to cancel out the | |
1888 | UNADJUSTED_ALIGNMENT. In other words, we want to ensure that the | |
1889 | PENDING_STACK_ADJUST is non-negative, and congruent to | |
1890 | -UNADJUSTED_ALIGNMENT modulo the PREFERRED_UNIT_STACK_BOUNDARY. */ | |
1891 | ||
1892 | /* Begin by trying to pop all the bytes. */ | |
f725a3ec KH |
1893 | unadjusted_alignment |
1894 | = (unadjusted_alignment | |
739fb049 MM |
1895 | - (pending_stack_adjust % preferred_unit_stack_boundary)); |
1896 | adjustment = pending_stack_adjust; | |
1897 | /* Push enough additional bytes that the stack will be aligned | |
1898 | after the arguments are pushed. */ | |
e079dcdb HB |
1899 | if (preferred_unit_stack_boundary > 1) |
1900 | { | |
3e555c7d | 1901 | if (unadjusted_alignment > 0) |
f725a3ec | 1902 | adjustment -= preferred_unit_stack_boundary - unadjusted_alignment; |
e079dcdb | 1903 | else |
f725a3ec | 1904 | adjustment += unadjusted_alignment; |
e079dcdb | 1905 | } |
f725a3ec | 1906 | |
739fb049 MM |
1907 | /* Now, sets ARGS_SIZE->CONSTANT so that we pop the right number of |
1908 | bytes after the call. The right number is the entire | |
1909 | PENDING_STACK_ADJUST less our ADJUSTMENT plus the amount required | |
1910 | by the arguments in the first place. */ | |
f725a3ec | 1911 | args_size->constant |
739fb049 MM |
1912 | = pending_stack_adjust - adjustment + unadjusted_args_size; |
1913 | ||
ce48579b | 1914 | return adjustment; |
739fb049 MM |
1915 | } |
1916 | ||
c67846f2 JJ |
1917 | /* Scan X expression if it does not dereference any argument slots |
1918 | we already clobbered by tail call arguments (as noted in stored_args_map | |
1919 | bitmap). | |
da7d8304 | 1920 | Return nonzero if X expression dereferences such argument slots, |
c67846f2 JJ |
1921 | zero otherwise. */ |
1922 | ||
1923 | static int | |
1924 | check_sibcall_argument_overlap_1 (x) | |
1925 | rtx x; | |
1926 | { | |
1927 | RTX_CODE code; | |
1928 | int i, j; | |
1929 | unsigned int k; | |
1930 | const char *fmt; | |
1931 | ||
1932 | if (x == NULL_RTX) | |
1933 | return 0; | |
1934 | ||
1935 | code = GET_CODE (x); | |
1936 | ||
1937 | if (code == MEM) | |
1938 | { | |
1939 | if (XEXP (x, 0) == current_function_internal_arg_pointer) | |
1940 | i = 0; | |
4c6b3b2a JJ |
1941 | else if (GET_CODE (XEXP (x, 0)) == PLUS |
1942 | && XEXP (XEXP (x, 0), 0) == | |
1943 | current_function_internal_arg_pointer | |
1944 | && GET_CODE (XEXP (XEXP (x, 0), 1)) == CONST_INT) | |
c67846f2 JJ |
1945 | i = INTVAL (XEXP (XEXP (x, 0), 1)); |
1946 | else | |
1947 | return 0; | |
1948 | ||
d60eab50 AO |
1949 | #ifdef ARGS_GROW_DOWNWARD |
1950 | i = -i - GET_MODE_SIZE (GET_MODE (x)); | |
1951 | #endif | |
1952 | ||
c67846f2 JJ |
1953 | for (k = 0; k < GET_MODE_SIZE (GET_MODE (x)); k++) |
1954 | if (i + k < stored_args_map->n_bits | |
1955 | && TEST_BIT (stored_args_map, i + k)) | |
1956 | return 1; | |
1957 | ||
1958 | return 0; | |
1959 | } | |
1960 | ||
f725a3ec | 1961 | /* Scan all subexpressions. */ |
c67846f2 JJ |
1962 | fmt = GET_RTX_FORMAT (code); |
1963 | for (i = 0; i < GET_RTX_LENGTH (code); i++, fmt++) | |
1964 | { | |
1965 | if (*fmt == 'e') | |
f725a3ec KH |
1966 | { |
1967 | if (check_sibcall_argument_overlap_1 (XEXP (x, i))) | |
1968 | return 1; | |
1969 | } | |
c67846f2 | 1970 | else if (*fmt == 'E') |
f725a3ec KH |
1971 | { |
1972 | for (j = 0; j < XVECLEN (x, i); j++) | |
1973 | if (check_sibcall_argument_overlap_1 (XVECEXP (x, i, j))) | |
1974 | return 1; | |
1975 | } | |
c67846f2 JJ |
1976 | } |
1977 | return 0; | |
c67846f2 JJ |
1978 | } |
1979 | ||
1980 | /* Scan sequence after INSN if it does not dereference any argument slots | |
1981 | we already clobbered by tail call arguments (as noted in stored_args_map | |
0cdca92b DJ |
1982 | bitmap). If MARK_STORED_ARGS_MAP, add stack slots for ARG to |
1983 | stored_args_map bitmap afterwards (when ARG is a register MARK_STORED_ARGS_MAP | |
1984 | should be 0). Return nonzero if sequence after INSN dereferences such argument | |
1985 | slots, zero otherwise. */ | |
c67846f2 JJ |
1986 | |
1987 | static int | |
0cdca92b | 1988 | check_sibcall_argument_overlap (insn, arg, mark_stored_args_map) |
c67846f2 JJ |
1989 | rtx insn; |
1990 | struct arg_data *arg; | |
0cdca92b | 1991 | int mark_stored_args_map; |
f725a3ec | 1992 | { |
c67846f2 JJ |
1993 | int low, high; |
1994 | ||
1995 | if (insn == NULL_RTX) | |
1996 | insn = get_insns (); | |
1997 | else | |
1998 | insn = NEXT_INSN (insn); | |
1999 | ||
2000 | for (; insn; insn = NEXT_INSN (insn)) | |
f725a3ec KH |
2001 | if (INSN_P (insn) |
2002 | && check_sibcall_argument_overlap_1 (PATTERN (insn))) | |
c67846f2 JJ |
2003 | break; |
2004 | ||
0cdca92b DJ |
2005 | if (mark_stored_args_map) |
2006 | { | |
d60eab50 | 2007 | #ifdef ARGS_GROW_DOWNWARD |
e7949876 | 2008 | low = -arg->locate.slot_offset.constant - arg->locate.size.constant; |
d60eab50 | 2009 | #else |
e7949876 | 2010 | low = arg->locate.slot_offset.constant; |
d60eab50 AO |
2011 | #endif |
2012 | ||
e7949876 | 2013 | for (high = low + arg->locate.size.constant; low < high; low++) |
0cdca92b DJ |
2014 | SET_BIT (stored_args_map, low); |
2015 | } | |
c67846f2 JJ |
2016 | return insn != NULL_RTX; |
2017 | } | |
2018 | ||
292e35a3 CE |
2019 | static tree |
2020 | fix_unsafe_tree (t) | |
2021 | tree t; | |
2022 | { | |
2023 | switch (unsafe_for_reeval (t)) | |
2024 | { | |
2025 | case 0: /* Safe. */ | |
2026 | break; | |
2027 | ||
2028 | case 1: /* Mildly unsafe. */ | |
2029 | t = unsave_expr (t); | |
2030 | break; | |
2031 | ||
2032 | case 2: /* Wildly unsafe. */ | |
2033 | { | |
2034 | tree var = build_decl (VAR_DECL, NULL_TREE, | |
2035 | TREE_TYPE (t)); | |
2036 | SET_DECL_RTL (var, | |
2037 | expand_expr (t, NULL_RTX, VOIDmode, EXPAND_NORMAL)); | |
2038 | t = var; | |
2039 | } | |
2040 | break; | |
2041 | ||
2042 | default: | |
2043 | abort (); | |
2044 | } | |
2045 | return t; | |
2046 | } | |
2047 | ||
51bbfa0c RS |
2048 | /* Generate all the code for a function call |
2049 | and return an rtx for its value. | |
2050 | Store the value in TARGET (specified as an rtx) if convenient. | |
2051 | If the value is stored in TARGET then TARGET is returned. | |
2052 | If IGNORE is nonzero, then we ignore the value of the function call. */ | |
2053 | ||
2054 | rtx | |
8129842c | 2055 | expand_call (exp, target, ignore) |
51bbfa0c RS |
2056 | tree exp; |
2057 | rtx target; | |
2058 | int ignore; | |
51bbfa0c | 2059 | { |
0a1c58a2 JL |
2060 | /* Nonzero if we are currently expanding a call. */ |
2061 | static int currently_expanding_call = 0; | |
2062 | ||
51bbfa0c RS |
2063 | /* List of actual parameters. */ |
2064 | tree actparms = TREE_OPERAND (exp, 1); | |
2065 | /* RTX for the function to be called. */ | |
2066 | rtx funexp; | |
0a1c58a2 JL |
2067 | /* Sequence of insns to perform a tail recursive "call". */ |
2068 | rtx tail_recursion_insns = NULL_RTX; | |
2069 | /* Sequence of insns to perform a normal "call". */ | |
2070 | rtx normal_call_insns = NULL_RTX; | |
2071 | /* Sequence of insns to perform a tail recursive "call". */ | |
2072 | rtx tail_call_insns = NULL_RTX; | |
51bbfa0c RS |
2073 | /* Data type of the function. */ |
2074 | tree funtype; | |
2075 | /* Declaration of the function being called, | |
2076 | or 0 if the function is computed (not known by name). */ | |
2077 | tree fndecl = 0; | |
0a1c58a2 | 2078 | rtx insn; |
099e9712 JH |
2079 | int try_tail_call = 1; |
2080 | int try_tail_recursion = 1; | |
0a1c58a2 | 2081 | int pass; |
51bbfa0c RS |
2082 | |
2083 | /* Register in which non-BLKmode value will be returned, | |
2084 | or 0 if no value or if value is BLKmode. */ | |
2085 | rtx valreg; | |
2086 | /* Address where we should return a BLKmode value; | |
2087 | 0 if value not BLKmode. */ | |
2088 | rtx structure_value_addr = 0; | |
2089 | /* Nonzero if that address is being passed by treating it as | |
2090 | an extra, implicit first parameter. Otherwise, | |
2091 | it is passed by being copied directly into struct_value_rtx. */ | |
2092 | int structure_value_addr_parm = 0; | |
2093 | /* Size of aggregate value wanted, or zero if none wanted | |
2094 | or if we are using the non-reentrant PCC calling convention | |
2095 | or expecting the value in registers. */ | |
e5e809f4 | 2096 | HOST_WIDE_INT struct_value_size = 0; |
51bbfa0c RS |
2097 | /* Nonzero if called function returns an aggregate in memory PCC style, |
2098 | by returning the address of where to find it. */ | |
2099 | int pcc_struct_value = 0; | |
2100 | ||
2101 | /* Number of actual parameters in this call, including struct value addr. */ | |
2102 | int num_actuals; | |
2103 | /* Number of named args. Args after this are anonymous ones | |
2104 | and they must all go on the stack. */ | |
2105 | int n_named_args; | |
51bbfa0c RS |
2106 | |
2107 | /* Vector of information about each argument. | |
2108 | Arguments are numbered in the order they will be pushed, | |
2109 | not the order they are written. */ | |
2110 | struct arg_data *args; | |
2111 | ||
2112 | /* Total size in bytes of all the stack-parms scanned so far. */ | |
2113 | struct args_size args_size; | |
099e9712 | 2114 | struct args_size adjusted_args_size; |
51bbfa0c | 2115 | /* Size of arguments before any adjustments (such as rounding). */ |
599f37b6 | 2116 | int unadjusted_args_size; |
51bbfa0c RS |
2117 | /* Data on reg parms scanned so far. */ |
2118 | CUMULATIVE_ARGS args_so_far; | |
2119 | /* Nonzero if a reg parm has been scanned. */ | |
2120 | int reg_parm_seen; | |
efd65a8b | 2121 | /* Nonzero if this is an indirect function call. */ |
51bbfa0c | 2122 | |
f725a3ec | 2123 | /* Nonzero if we must avoid push-insns in the args for this call. |
51bbfa0c RS |
2124 | If stack space is allocated for register parameters, but not by the |
2125 | caller, then it is preallocated in the fixed part of the stack frame. | |
2126 | So the entire argument block must then be preallocated (i.e., we | |
2127 | ignore PUSH_ROUNDING in that case). */ | |
2128 | ||
f73ad30e | 2129 | int must_preallocate = !PUSH_ARGS; |
51bbfa0c | 2130 | |
f72aed24 | 2131 | /* Size of the stack reserved for parameter registers. */ |
6f90e075 JW |
2132 | int reg_parm_stack_space = 0; |
2133 | ||
51bbfa0c RS |
2134 | /* Address of space preallocated for stack parms |
2135 | (on machines that lack push insns), or 0 if space not preallocated. */ | |
2136 | rtx argblock = 0; | |
2137 | ||
f2d33f13 JH |
2138 | /* Mask of ECF_ flags. */ |
2139 | int flags = 0; | |
51bbfa0c RS |
2140 | /* Nonzero if this is a call to an inline function. */ |
2141 | int is_integrable = 0; | |
f73ad30e | 2142 | #ifdef REG_PARM_STACK_SPACE |
51bbfa0c | 2143 | /* Define the boundary of the register parm stack space that needs to be |
b820d2b8 AM |
2144 | saved, if any. */ |
2145 | int low_to_save, high_to_save; | |
51bbfa0c RS |
2146 | rtx save_area = 0; /* Place that it is saved */ |
2147 | #endif | |
2148 | ||
51bbfa0c RS |
2149 | int initial_highest_arg_in_use = highest_outgoing_arg_in_use; |
2150 | char *initial_stack_usage_map = stack_usage_map; | |
51bbfa0c | 2151 | |
38afb23f OH |
2152 | int old_stack_allocated; |
2153 | ||
2154 | /* State variables to track stack modifications. */ | |
51bbfa0c | 2155 | rtx old_stack_level = 0; |
38afb23f | 2156 | int old_stack_arg_under_construction = 0; |
79be3418 | 2157 | int old_pending_adj = 0; |
51bbfa0c | 2158 | int old_inhibit_defer_pop = inhibit_defer_pop; |
38afb23f OH |
2159 | |
2160 | /* Some stack pointer alterations we make are performed via | |
2161 | allocate_dynamic_stack_space. This modifies the stack_pointer_delta, | |
2162 | which we then also need to save/restore along the way. */ | |
a259f218 | 2163 | int old_stack_pointer_delta = 0; |
38afb23f | 2164 | |
0a1c58a2 | 2165 | rtx call_fusage; |
b3694847 | 2166 | tree p = TREE_OPERAND (exp, 0); |
09e2bf48 | 2167 | tree addr = TREE_OPERAND (exp, 0); |
b3694847 | 2168 | int i; |
739fb049 MM |
2169 | /* The alignment of the stack, in bits. */ |
2170 | HOST_WIDE_INT preferred_stack_boundary; | |
2171 | /* The alignment of the stack, in bytes. */ | |
2172 | HOST_WIDE_INT preferred_unit_stack_boundary; | |
51bbfa0c | 2173 | |
f2d33f13 JH |
2174 | /* See if this is "nothrow" function call. */ |
2175 | if (TREE_NOTHROW (exp)) | |
2176 | flags |= ECF_NOTHROW; | |
2177 | ||
51bbfa0c RS |
2178 | /* See if we can find a DECL-node for the actual function. |
2179 | As a result, decide whether this is a call to an integrable function. */ | |
2180 | ||
39b0dce7 JM |
2181 | fndecl = get_callee_fndecl (exp); |
2182 | if (fndecl) | |
51bbfa0c | 2183 | { |
39b0dce7 JM |
2184 | if (!flag_no_inline |
2185 | && fndecl != current_function_decl | |
2186 | && DECL_INLINE (fndecl) | |
2187 | && DECL_SAVED_INSNS (fndecl) | |
2188 | && DECL_SAVED_INSNS (fndecl)->inlinable) | |
2189 | is_integrable = 1; | |
2190 | else if (! TREE_ADDRESSABLE (fndecl)) | |
51bbfa0c | 2191 | { |
39b0dce7 JM |
2192 | /* In case this function later becomes inlinable, |
2193 | record that there was already a non-inline call to it. | |
51bbfa0c | 2194 | |
39b0dce7 JM |
2195 | Use abstraction instead of setting TREE_ADDRESSABLE |
2196 | directly. */ | |
2197 | if (DECL_INLINE (fndecl) && warn_inline && !flag_no_inline | |
2198 | && optimize > 0) | |
2199 | { | |
2200 | warning_with_decl (fndecl, "can't inline call to `%s'"); | |
2201 | warning ("called from here"); | |
51bbfa0c | 2202 | } |
dffd7eb6 | 2203 | (*lang_hooks.mark_addressable) (fndecl); |
51bbfa0c | 2204 | } |
39b0dce7 JM |
2205 | |
2206 | flags |= flags_from_decl_or_type (fndecl); | |
51bbfa0c RS |
2207 | } |
2208 | ||
f725a3ec | 2209 | /* If we don't have specific function to call, see if we have a |
f2d33f13 | 2210 | attributes set in the type. */ |
39b0dce7 | 2211 | else |
7393c642 RK |
2212 | flags |= flags_from_decl_or_type (TREE_TYPE (TREE_TYPE (p))); |
2213 | ||
6f90e075 JW |
2214 | #ifdef REG_PARM_STACK_SPACE |
2215 | #ifdef MAYBE_REG_PARM_STACK_SPACE | |
2216 | reg_parm_stack_space = MAYBE_REG_PARM_STACK_SPACE; | |
2217 | #else | |
2218 | reg_parm_stack_space = REG_PARM_STACK_SPACE (fndecl); | |
2219 | #endif | |
2220 | #endif | |
2221 | ||
f73ad30e JH |
2222 | #ifndef OUTGOING_REG_PARM_STACK_SPACE |
2223 | if (reg_parm_stack_space > 0 && PUSH_ARGS) | |
e5e809f4 JL |
2224 | must_preallocate = 1; |
2225 | #endif | |
2226 | ||
51bbfa0c RS |
2227 | /* Warn if this value is an aggregate type, |
2228 | regardless of which calling convention we are using for it. */ | |
05e3bdb9 | 2229 | if (warn_aggregate_return && AGGREGATE_TYPE_P (TREE_TYPE (exp))) |
51bbfa0c RS |
2230 | warning ("function call has aggregate value"); |
2231 | ||
2232 | /* Set up a place to return a structure. */ | |
2233 | ||
2234 | /* Cater to broken compilers. */ | |
2235 | if (aggregate_value_p (exp)) | |
2236 | { | |
2237 | /* This call returns a big structure. */ | |
53d4257f | 2238 | flags &= ~(ECF_CONST | ECF_PURE | ECF_LIBCALL_BLOCK); |
51bbfa0c RS |
2239 | |
2240 | #ifdef PCC_STATIC_STRUCT_RETURN | |
9e7b1d0a RS |
2241 | { |
2242 | pcc_struct_value = 1; | |
0dd532dc JW |
2243 | /* Easier than making that case work right. */ |
2244 | if (is_integrable) | |
2245 | { | |
2246 | /* In case this is a static function, note that it has been | |
2247 | used. */ | |
2248 | if (! TREE_ADDRESSABLE (fndecl)) | |
dffd7eb6 | 2249 | (*lang_hooks.mark_addressable) (fndecl); |
0dd532dc JW |
2250 | is_integrable = 0; |
2251 | } | |
9e7b1d0a RS |
2252 | } |
2253 | #else /* not PCC_STATIC_STRUCT_RETURN */ | |
2254 | { | |
2255 | struct_value_size = int_size_in_bytes (TREE_TYPE (exp)); | |
51bbfa0c | 2256 | |
4977bab6 | 2257 | if (CALL_EXPR_HAS_RETURN_SLOT_ADDR (exp)) |
89ea02fb | 2258 | { |
f32ac70d JM |
2259 | /* The structure value address arg is already in actparms. |
2260 | Pull it out. It might be nice to just leave it there, but | |
2261 | we need to set structure_value_addr. */ | |
2262 | tree return_arg = TREE_VALUE (actparms); | |
2263 | actparms = TREE_CHAIN (actparms); | |
2264 | structure_value_addr = expand_expr (return_arg, NULL_RTX, | |
2265 | VOIDmode, EXPAND_NORMAL); | |
89ea02fb | 2266 | } |
4977bab6 | 2267 | else if (target && GET_CODE (target) == MEM) |
9e7b1d0a RS |
2268 | structure_value_addr = XEXP (target, 0); |
2269 | else | |
2270 | { | |
9e7b1d0a RS |
2271 | /* For variable-sized objects, we must be called with a target |
2272 | specified. If we were to allocate space on the stack here, | |
2273 | we would have no way of knowing when to free it. */ | |
1da68f56 | 2274 | rtx d = assign_temp (TREE_TYPE (exp), 1, 1, 1); |
51bbfa0c | 2275 | |
4361b41d MM |
2276 | mark_temp_addr_taken (d); |
2277 | structure_value_addr = XEXP (d, 0); | |
9e7b1d0a RS |
2278 | target = 0; |
2279 | } | |
2280 | } | |
2281 | #endif /* not PCC_STATIC_STRUCT_RETURN */ | |
51bbfa0c RS |
2282 | } |
2283 | ||
2284 | /* If called function is inline, try to integrate it. */ | |
2285 | ||
2286 | if (is_integrable) | |
2287 | { | |
f2d33f13 JH |
2288 | rtx temp = try_to_integrate (fndecl, actparms, target, |
2289 | ignore, TREE_TYPE (exp), | |
2290 | structure_value_addr); | |
60e8b9f0 | 2291 | if (temp != (rtx) (size_t) - 1) |
f2d33f13 | 2292 | return temp; |
51bbfa0c RS |
2293 | } |
2294 | ||
099e9712 | 2295 | /* Figure out the amount to which the stack should be aligned. */ |
099e9712 | 2296 | preferred_stack_boundary = PREFERRED_STACK_BOUNDARY; |
b255a036 JH |
2297 | if (fndecl) |
2298 | { | |
2299 | struct cgraph_rtl_info *i = cgraph_rtl_info (fndecl); | |
2300 | if (i && i->preferred_incoming_stack_boundary) | |
2301 | preferred_stack_boundary = i->preferred_incoming_stack_boundary; | |
2302 | } | |
099e9712 JH |
2303 | |
2304 | /* Operand 0 is a pointer-to-function; get the type of the function. */ | |
09e2bf48 | 2305 | funtype = TREE_TYPE (addr); |
099e9712 JH |
2306 | if (! POINTER_TYPE_P (funtype)) |
2307 | abort (); | |
2308 | funtype = TREE_TYPE (funtype); | |
2309 | ||
2310 | /* See if this is a call to a function that can return more than once | |
2311 | or a call to longjmp or malloc. */ | |
2312 | flags |= special_function_p (fndecl, flags); | |
2313 | ||
2314 | if (flags & ECF_MAY_BE_ALLOCA) | |
2315 | current_function_calls_alloca = 1; | |
2316 | ||
2317 | /* If struct_value_rtx is 0, it means pass the address | |
2318 | as if it were an extra parameter. */ | |
2319 | if (structure_value_addr && struct_value_rtx == 0) | |
2320 | { | |
2321 | /* If structure_value_addr is a REG other than | |
2322 | virtual_outgoing_args_rtx, we can use always use it. If it | |
2323 | is not a REG, we must always copy it into a register. | |
2324 | If it is virtual_outgoing_args_rtx, we must copy it to another | |
2325 | register in some cases. */ | |
2326 | rtx temp = (GET_CODE (structure_value_addr) != REG | |
2327 | || (ACCUMULATE_OUTGOING_ARGS | |
2328 | && stack_arg_under_construction | |
2329 | && structure_value_addr == virtual_outgoing_args_rtx) | |
2330 | ? copy_addr_to_reg (structure_value_addr) | |
2331 | : structure_value_addr); | |
2332 | ||
2333 | actparms | |
2334 | = tree_cons (error_mark_node, | |
2335 | make_tree (build_pointer_type (TREE_TYPE (funtype)), | |
2336 | temp), | |
2337 | actparms); | |
2338 | structure_value_addr_parm = 1; | |
2339 | } | |
2340 | ||
2341 | /* Count the arguments and set NUM_ACTUALS. */ | |
2342 | for (p = actparms, num_actuals = 0; p; p = TREE_CHAIN (p)) | |
2343 | num_actuals++; | |
2344 | ||
2345 | /* Compute number of named args. | |
2346 | Normally, don't include the last named arg if anonymous args follow. | |
2347 | We do include the last named arg if STRICT_ARGUMENT_NAMING is nonzero. | |
2348 | (If no anonymous args follow, the result of list_length is actually | |
2349 | one too large. This is harmless.) | |
2350 | ||
2351 | If PRETEND_OUTGOING_VARARGS_NAMED is set and STRICT_ARGUMENT_NAMING is | |
2352 | zero, this machine will be able to place unnamed args that were | |
2353 | passed in registers into the stack. So treat all args as named. | |
2354 | This allows the insns emitting for a specific argument list to be | |
2355 | independent of the function declaration. | |
2356 | ||
2357 | If PRETEND_OUTGOING_VARARGS_NAMED is not set, we do not have any | |
2358 | reliable way to pass unnamed args in registers, so we must force | |
2359 | them into memory. */ | |
2360 | ||
2361 | if ((STRICT_ARGUMENT_NAMING | |
2362 | || ! PRETEND_OUTGOING_VARARGS_NAMED) | |
2363 | && TYPE_ARG_TYPES (funtype) != 0) | |
2364 | n_named_args | |
2365 | = (list_length (TYPE_ARG_TYPES (funtype)) | |
2366 | /* Don't include the last named arg. */ | |
2367 | - (STRICT_ARGUMENT_NAMING ? 0 : 1) | |
2368 | /* Count the struct value address, if it is passed as a parm. */ | |
2369 | + structure_value_addr_parm); | |
2370 | else | |
2371 | /* If we know nothing, treat all args as named. */ | |
2372 | n_named_args = num_actuals; | |
2373 | ||
2374 | /* Start updating where the next arg would go. | |
2375 | ||
2376 | On some machines (such as the PA) indirect calls have a different | |
2377 | calling convention than normal calls. The last argument in | |
2378 | INIT_CUMULATIVE_ARGS tells the backend if this is an indirect call | |
2379 | or not. */ | |
563a317a | 2380 | INIT_CUMULATIVE_ARGS (args_so_far, funtype, NULL_RTX, fndecl); |
099e9712 | 2381 | |
099e9712 | 2382 | /* Make a vector to hold all the information about each arg. */ |
f725a3ec | 2383 | args = (struct arg_data *) alloca (num_actuals * sizeof (struct arg_data)); |
961192e1 | 2384 | memset ((char *) args, 0, num_actuals * sizeof (struct arg_data)); |
099e9712 | 2385 | |
d80d2d2a KH |
2386 | /* Build up entries in the ARGS array, compute the size of the |
2387 | arguments into ARGS_SIZE, etc. */ | |
099e9712 JH |
2388 | initialize_argument_information (num_actuals, args, &args_size, |
2389 | n_named_args, actparms, fndecl, | |
2390 | &args_so_far, reg_parm_stack_space, | |
2391 | &old_stack_level, &old_pending_adj, | |
2392 | &must_preallocate, &flags); | |
2393 | ||
2394 | if (args_size.var) | |
2395 | { | |
2396 | /* If this function requires a variable-sized argument list, don't | |
2397 | try to make a cse'able block for this call. We may be able to | |
2398 | do this eventually, but it is too complicated to keep track of | |
6d2f8887 | 2399 | what insns go in the cse'able block and which don't. */ |
099e9712 | 2400 | |
53d4257f | 2401 | flags &= ~ECF_LIBCALL_BLOCK; |
099e9712 JH |
2402 | must_preallocate = 1; |
2403 | } | |
2404 | ||
2405 | /* Now make final decision about preallocating stack space. */ | |
2406 | must_preallocate = finalize_must_preallocate (must_preallocate, | |
2407 | num_actuals, args, | |
2408 | &args_size); | |
2409 | ||
2410 | /* If the structure value address will reference the stack pointer, we | |
2411 | must stabilize it. We don't need to do this if we know that we are | |
2412 | not going to adjust the stack pointer in processing this call. */ | |
2413 | ||
2414 | if (structure_value_addr | |
2415 | && (reg_mentioned_p (virtual_stack_dynamic_rtx, structure_value_addr) | |
2416 | || reg_mentioned_p (virtual_outgoing_args_rtx, | |
2417 | structure_value_addr)) | |
2418 | && (args_size.var | |
2419 | || (!ACCUMULATE_OUTGOING_ARGS && args_size.constant))) | |
2420 | structure_value_addr = copy_to_reg (structure_value_addr); | |
0a1c58a2 | 2421 | |
194c7c45 RH |
2422 | /* Tail calls can make things harder to debug, and we're traditionally |
2423 | pushed these optimizations into -O2. Don't try if we're already | |
fb158467 JH |
2424 | expanding a call, as that means we're an argument. Don't try if |
2425 | there's cleanups, as we know there's code to follow the call. | |
e2ee9912 | 2426 | |
f725a3ec | 2427 | If rtx_equal_function_value_matters is false, that means we've |
e2ee9912 RH |
2428 | finished with regular parsing. Which means that some of the |
2429 | machinery we use to generate tail-calls is no longer in place. | |
2430 | This is most often true of sjlj-exceptions, which we couldn't | |
2431 | tail-call to anyway. */ | |
0a1c58a2 | 2432 | |
099e9712 JH |
2433 | if (currently_expanding_call++ != 0 |
2434 | || !flag_optimize_sibling_calls | |
2435 | || !rtx_equal_function_value_matters | |
099e9712 JH |
2436 | || any_pending_cleanups (1) |
2437 | || args_size.var) | |
2438 | try_tail_call = try_tail_recursion = 0; | |
2439 | ||
2440 | /* Tail recursion fails, when we are not dealing with recursive calls. */ | |
2441 | if (!try_tail_recursion | |
09e2bf48 JH |
2442 | || TREE_CODE (addr) != ADDR_EXPR |
2443 | || TREE_OPERAND (addr, 0) != current_function_decl) | |
099e9712 JH |
2444 | try_tail_recursion = 0; |
2445 | ||
2446 | /* Rest of purposes for tail call optimizations to fail. */ | |
2447 | if ( | |
2448 | #ifdef HAVE_sibcall_epilogue | |
2449 | !HAVE_sibcall_epilogue | |
2450 | #else | |
2451 | 1 | |
2452 | #endif | |
2453 | || !try_tail_call | |
2454 | /* Doing sibling call optimization needs some work, since | |
2455 | structure_value_addr can be allocated on the stack. | |
2456 | It does not seem worth the effort since few optimizable | |
2457 | sibling calls will return a structure. */ | |
2458 | || structure_value_addr != NULL_RTX | |
4977bab6 ZW |
2459 | /* Check whether the target is able to optimize the call |
2460 | into a sibcall. */ | |
2461 | || !(*targetm.function_ok_for_sibcall) (fndecl, exp) | |
2462 | /* Functions that do not return exactly once may not be sibcall | |
2463 | optimized. */ | |
db655634 | 2464 | || (flags & (ECF_RETURNS_TWICE | ECF_LONGJMP | ECF_NORETURN)) |
09e2bf48 | 2465 | || TYPE_VOLATILE (TREE_TYPE (TREE_TYPE (addr))) |
6a48df45 OH |
2466 | /* If the called function is nested in the current one, it might access |
2467 | some of the caller's arguments, but could clobber them beforehand if | |
2468 | the argument areas are shared. */ | |
2469 | || (fndecl && decl_function_context (fndecl) == current_function_decl) | |
099e9712 JH |
2470 | /* If this function requires more stack slots than the current |
2471 | function, we cannot change it into a sibling call. */ | |
2472 | || args_size.constant > current_function_args_size | |
2473 | /* If the callee pops its own arguments, then it must pop exactly | |
2474 | the same number of arguments as the current function. */ | |
2475 | || RETURN_POPS_ARGS (fndecl, funtype, args_size.constant) | |
2476 | != RETURN_POPS_ARGS (current_function_decl, | |
2477 | TREE_TYPE (current_function_decl), | |
2478 | current_function_args_size)) | |
e6f64875 | 2479 | try_tail_call = 0; |
497eb8c3 | 2480 | |
099e9712 JH |
2481 | if (try_tail_call || try_tail_recursion) |
2482 | { | |
2483 | int end, inc; | |
2484 | actparms = NULL_TREE; | |
194c7c45 RH |
2485 | /* Ok, we're going to give the tail call the old college try. |
2486 | This means we're going to evaluate the function arguments | |
2487 | up to three times. There are two degrees of badness we can | |
2488 | encounter, those that can be unsaved and those that can't. | |
2489 | (See unsafe_for_reeval commentary for details.) | |
2490 | ||
2491 | Generate a new argument list. Pass safe arguments through | |
f725a3ec | 2492 | unchanged. For the easy badness wrap them in UNSAVE_EXPRs. |
194c7c45 | 2493 | For hard badness, evaluate them now and put their resulting |
099e9712 JH |
2494 | rtx in a temporary VAR_DECL. |
2495 | ||
2496 | initialize_argument_information has ordered the array for the | |
2497 | order to be pushed, and we must remember this when reconstructing | |
f5143c46 | 2498 | the original argument order. */ |
4d393a0b | 2499 | |
099e9712 JH |
2500 | if (PUSH_ARGS_REVERSED) |
2501 | { | |
2502 | inc = 1; | |
2503 | i = 0; | |
2504 | end = num_actuals; | |
2505 | } | |
2506 | else | |
f725a3ec | 2507 | { |
099e9712 JH |
2508 | inc = -1; |
2509 | i = num_actuals - 1; | |
2510 | end = -1; | |
2511 | } | |
2512 | ||
2513 | for (; i != end; i += inc) | |
2514 | { | |
292e35a3 | 2515 | args[i].tree_value = fix_unsafe_tree (args[i].tree_value); |
099e9712 JH |
2516 | /* We need to build actparms for optimize_tail_recursion. We can |
2517 | safely trash away TREE_PURPOSE, since it is unused by this | |
2518 | function. */ | |
2519 | if (try_tail_recursion) | |
2520 | actparms = tree_cons (NULL_TREE, args[i].tree_value, actparms); | |
2521 | } | |
3dc575ff | 2522 | /* Do the same for the function address if it is an expression. */ |
292e35a3 | 2523 | if (!fndecl) |
09e2bf48 | 2524 | addr = fix_unsafe_tree (addr); |
194c7c45 RH |
2525 | /* Expanding one of those dangerous arguments could have added |
2526 | cleanups, but otherwise give it a whirl. */ | |
099e9712 JH |
2527 | if (any_pending_cleanups (1)) |
2528 | try_tail_call = try_tail_recursion = 0; | |
0a1c58a2 JL |
2529 | } |
2530 | ||
2531 | /* Generate a tail recursion sequence when calling ourselves. */ | |
2532 | ||
099e9712 | 2533 | if (try_tail_recursion) |
0a1c58a2 JL |
2534 | { |
2535 | /* We want to emit any pending stack adjustments before the tail | |
2536 | recursion "call". That way we know any adjustment after the tail | |
2537 | recursion call can be ignored if we indeed use the tail recursion | |
2538 | call expansion. */ | |
2539 | int save_pending_stack_adjust = pending_stack_adjust; | |
1503a7ec | 2540 | int save_stack_pointer_delta = stack_pointer_delta; |
0a1c58a2 | 2541 | |
41c39533 RH |
2542 | /* Emit any queued insns now; otherwise they would end up in |
2543 | only one of the alternates. */ | |
2544 | emit_queue (); | |
2545 | ||
0a1c58a2 JL |
2546 | /* Use a new sequence to hold any RTL we generate. We do not even |
2547 | know if we will use this RTL yet. The final decision can not be | |
2548 | made until after RTL generation for the entire function is | |
2549 | complete. */ | |
b06775f9 | 2550 | start_sequence (); |
f5e846c8 MM |
2551 | /* If expanding any of the arguments creates cleanups, we can't |
2552 | do a tailcall. So, we'll need to pop the pending cleanups | |
2553 | list. If, however, all goes well, and there are no cleanups | |
2554 | then the call to expand_start_target_temps will have no | |
2555 | effect. */ | |
2556 | expand_start_target_temps (); | |
b06775f9 | 2557 | if (optimize_tail_recursion (actparms, get_last_insn ())) |
f5e846c8 MM |
2558 | { |
2559 | if (any_pending_cleanups (1)) | |
2560 | try_tail_call = try_tail_recursion = 0; | |
2561 | else | |
2562 | tail_recursion_insns = get_insns (); | |
2563 | } | |
2564 | expand_end_target_temps (); | |
0a1c58a2 JL |
2565 | end_sequence (); |
2566 | ||
0a1c58a2 JL |
2567 | /* Restore the original pending stack adjustment for the sibling and |
2568 | normal call cases below. */ | |
2569 | pending_stack_adjust = save_pending_stack_adjust; | |
1503a7ec | 2570 | stack_pointer_delta = save_stack_pointer_delta; |
0a1c58a2 JL |
2571 | } |
2572 | ||
099e9712 JH |
2573 | if (profile_arc_flag && (flags & ECF_FORK_OR_EXEC)) |
2574 | { | |
2575 | /* A fork duplicates the profile information, and an exec discards | |
2576 | it. We can't rely on fork/exec to be paired. So write out the | |
2577 | profile information we have gathered so far, and clear it. */ | |
2578 | /* ??? When Linux's __clone is called with CLONE_VM set, profiling | |
2579 | is subject to race conditions, just as with multithreaded | |
2580 | programs. */ | |
2581 | ||
68d28100 | 2582 | emit_library_call (gcov_flush_libfunc, LCT_ALWAYS_RETURN, VOIDmode, 0); |
099e9712 | 2583 | } |
0a1c58a2 | 2584 | |
c2f8b491 JH |
2585 | /* Ensure current function's preferred stack boundary is at least |
2586 | what we need. We don't have to increase alignment for recursive | |
2587 | functions. */ | |
2588 | if (cfun->preferred_stack_boundary < preferred_stack_boundary | |
2589 | && fndecl != current_function_decl) | |
2590 | cfun->preferred_stack_boundary = preferred_stack_boundary; | |
b255a036 JH |
2591 | if (fndecl == current_function_decl) |
2592 | cfun->recursive_call_emit = true; | |
c2f8b491 | 2593 | |
099e9712 | 2594 | preferred_unit_stack_boundary = preferred_stack_boundary / BITS_PER_UNIT; |
497eb8c3 | 2595 | |
099e9712 | 2596 | function_call_count++; |
39842893 | 2597 | |
0a1c58a2 JL |
2598 | /* We want to make two insn chains; one for a sibling call, the other |
2599 | for a normal call. We will select one of the two chains after | |
2600 | initial RTL generation is complete. */ | |
b820d2b8 | 2601 | for (pass = try_tail_call ? 0 : 1; pass < 2; pass++) |
0a1c58a2 JL |
2602 | { |
2603 | int sibcall_failure = 0; | |
f5143c46 | 2604 | /* We want to emit any pending stack adjustments before the tail |
0a1c58a2 JL |
2605 | recursion "call". That way we know any adjustment after the tail |
2606 | recursion call can be ignored if we indeed use the tail recursion | |
2607 | call expansion. */ | |
5ac9118e KG |
2608 | int save_pending_stack_adjust = 0; |
2609 | int save_stack_pointer_delta = 0; | |
0a1c58a2 | 2610 | rtx insns; |
7d167afd | 2611 | rtx before_call, next_arg_reg; |
39842893 | 2612 | |
0a1c58a2 JL |
2613 | if (pass == 0) |
2614 | { | |
1c81f9fe JM |
2615 | /* Emit any queued insns now; otherwise they would end up in |
2616 | only one of the alternates. */ | |
2617 | emit_queue (); | |
2618 | ||
0a1c58a2 JL |
2619 | /* State variables we need to save and restore between |
2620 | iterations. */ | |
2621 | save_pending_stack_adjust = pending_stack_adjust; | |
1503a7ec | 2622 | save_stack_pointer_delta = stack_pointer_delta; |
0a1c58a2 | 2623 | } |
f2d33f13 JH |
2624 | if (pass) |
2625 | flags &= ~ECF_SIBCALL; | |
2626 | else | |
2627 | flags |= ECF_SIBCALL; | |
51bbfa0c | 2628 | |
0a1c58a2 | 2629 | /* Other state variables that we must reinitialize each time |
f2d33f13 | 2630 | through the loop (that are not initialized by the loop itself). */ |
0a1c58a2 JL |
2631 | argblock = 0; |
2632 | call_fusage = 0; | |
fa76d9e0 | 2633 | |
f725a3ec | 2634 | /* Start a new sequence for the normal call case. |
51bbfa0c | 2635 | |
0a1c58a2 JL |
2636 | From this point on, if the sibling call fails, we want to set |
2637 | sibcall_failure instead of continuing the loop. */ | |
2638 | start_sequence (); | |
eecb6f50 | 2639 | |
b8d254e6 JJ |
2640 | if (pass == 0) |
2641 | { | |
2642 | /* We know at this point that there are not currently any | |
2643 | pending cleanups. If, however, in the process of evaluating | |
2644 | the arguments we were to create some, we'll need to be | |
2645 | able to get rid of them. */ | |
2646 | expand_start_target_temps (); | |
2647 | } | |
2648 | ||
0a1c58a2 JL |
2649 | /* Don't let pending stack adjusts add up to too much. |
2650 | Also, do all pending adjustments now if there is any chance | |
2651 | this might be a call to alloca or if we are expanding a sibling | |
b5cd4ed4 RK |
2652 | call sequence or if we are calling a function that is to return |
2653 | with stack pointer depressed. */ | |
0a1c58a2 | 2654 | if (pending_stack_adjust >= 32 |
b5cd4ed4 RK |
2655 | || (pending_stack_adjust > 0 |
2656 | && (flags & (ECF_MAY_BE_ALLOCA | ECF_SP_DEPRESSED))) | |
0a1c58a2 JL |
2657 | || pass == 0) |
2658 | do_pending_stack_adjust (); | |
51bbfa0c | 2659 | |
54fef245 RH |
2660 | /* When calling a const function, we must pop the stack args right away, |
2661 | so that the pop is deleted or moved with the call. */ | |
53d4257f | 2662 | if (pass && (flags & ECF_LIBCALL_BLOCK)) |
54fef245 RH |
2663 | NO_DEFER_POP; |
2664 | ||
6f90e075 | 2665 | #ifdef FINAL_REG_PARM_STACK_SPACE |
0a1c58a2 JL |
2666 | reg_parm_stack_space = FINAL_REG_PARM_STACK_SPACE (args_size.constant, |
2667 | args_size.var); | |
6f90e075 | 2668 | #endif |
0a1c58a2 | 2669 | /* Precompute any arguments as needed. */ |
f8a097cd JH |
2670 | if (pass) |
2671 | precompute_arguments (flags, num_actuals, args); | |
51bbfa0c | 2672 | |
0a1c58a2 JL |
2673 | /* Now we are about to start emitting insns that can be deleted |
2674 | if a libcall is deleted. */ | |
53d4257f | 2675 | if (pass && (flags & (ECF_LIBCALL_BLOCK | ECF_MALLOC))) |
0a1c58a2 | 2676 | start_sequence (); |
51bbfa0c | 2677 | |
099e9712 | 2678 | adjusted_args_size = args_size; |
ce48579b RH |
2679 | /* Compute the actual size of the argument block required. The variable |
2680 | and constant sizes must be combined, the size may have to be rounded, | |
2681 | and there may be a minimum required size. When generating a sibcall | |
2682 | pattern, do not round up, since we'll be re-using whatever space our | |
2683 | caller provided. */ | |
2684 | unadjusted_args_size | |
f725a3ec KH |
2685 | = compute_argument_block_size (reg_parm_stack_space, |
2686 | &adjusted_args_size, | |
ce48579b RH |
2687 | (pass == 0 ? 0 |
2688 | : preferred_stack_boundary)); | |
2689 | ||
f725a3ec | 2690 | old_stack_allocated = stack_pointer_delta - pending_stack_adjust; |
ce48579b | 2691 | |
f8a097cd JH |
2692 | /* The argument block when performing a sibling call is the |
2693 | incoming argument block. */ | |
2694 | if (pass == 0) | |
c67846f2 JJ |
2695 | { |
2696 | argblock = virtual_incoming_args_rtx; | |
fcae219a R |
2697 | argblock |
2698 | #ifdef STACK_GROWS_DOWNWARD | |
2699 | = plus_constant (argblock, current_function_pretend_args_size); | |
2700 | #else | |
2701 | = plus_constant (argblock, -current_function_pretend_args_size); | |
2702 | #endif | |
c67846f2 JJ |
2703 | stored_args_map = sbitmap_alloc (args_size.constant); |
2704 | sbitmap_zero (stored_args_map); | |
2705 | } | |
ce48579b | 2706 | |
0a1c58a2 JL |
2707 | /* If we have no actual push instructions, or shouldn't use them, |
2708 | make space for all args right now. */ | |
099e9712 | 2709 | else if (adjusted_args_size.var != 0) |
51bbfa0c | 2710 | { |
0a1c58a2 JL |
2711 | if (old_stack_level == 0) |
2712 | { | |
2713 | emit_stack_save (SAVE_BLOCK, &old_stack_level, NULL_RTX); | |
38afb23f | 2714 | old_stack_pointer_delta = stack_pointer_delta; |
0a1c58a2 JL |
2715 | old_pending_adj = pending_stack_adjust; |
2716 | pending_stack_adjust = 0; | |
0a1c58a2 JL |
2717 | /* stack_arg_under_construction says whether a stack arg is |
2718 | being constructed at the old stack level. Pushing the stack | |
2719 | gets a clean outgoing argument block. */ | |
2720 | old_stack_arg_under_construction = stack_arg_under_construction; | |
2721 | stack_arg_under_construction = 0; | |
0a1c58a2 | 2722 | } |
099e9712 | 2723 | argblock = push_block (ARGS_SIZE_RTX (adjusted_args_size), 0, 0); |
51bbfa0c | 2724 | } |
0a1c58a2 JL |
2725 | else |
2726 | { | |
2727 | /* Note that we must go through the motions of allocating an argument | |
2728 | block even if the size is zero because we may be storing args | |
2729 | in the area reserved for register arguments, which may be part of | |
2730 | the stack frame. */ | |
26a258fe | 2731 | |
099e9712 | 2732 | int needed = adjusted_args_size.constant; |
51bbfa0c | 2733 | |
0a1c58a2 JL |
2734 | /* Store the maximum argument space used. It will be pushed by |
2735 | the prologue (if ACCUMULATE_OUTGOING_ARGS, or stack overflow | |
2736 | checking). */ | |
51bbfa0c | 2737 | |
0a1c58a2 JL |
2738 | if (needed > current_function_outgoing_args_size) |
2739 | current_function_outgoing_args_size = needed; | |
51bbfa0c | 2740 | |
0a1c58a2 JL |
2741 | if (must_preallocate) |
2742 | { | |
f73ad30e JH |
2743 | if (ACCUMULATE_OUTGOING_ARGS) |
2744 | { | |
f8a097cd JH |
2745 | /* Since the stack pointer will never be pushed, it is |
2746 | possible for the evaluation of a parm to clobber | |
2747 | something we have already written to the stack. | |
2748 | Since most function calls on RISC machines do not use | |
2749 | the stack, this is uncommon, but must work correctly. | |
26a258fe | 2750 | |
f73ad30e | 2751 | Therefore, we save any area of the stack that was already |
f8a097cd JH |
2752 | written and that we are using. Here we set up to do this |
2753 | by making a new stack usage map from the old one. The | |
f725a3ec | 2754 | actual save will be done by store_one_arg. |
26a258fe | 2755 | |
f73ad30e JH |
2756 | Another approach might be to try to reorder the argument |
2757 | evaluations to avoid this conflicting stack usage. */ | |
26a258fe | 2758 | |
e5e809f4 | 2759 | #ifndef OUTGOING_REG_PARM_STACK_SPACE |
f8a097cd JH |
2760 | /* Since we will be writing into the entire argument area, |
2761 | the map must be allocated for its entire size, not just | |
2762 | the part that is the responsibility of the caller. */ | |
f73ad30e | 2763 | needed += reg_parm_stack_space; |
51bbfa0c RS |
2764 | #endif |
2765 | ||
2766 | #ifdef ARGS_GROW_DOWNWARD | |
f73ad30e JH |
2767 | highest_outgoing_arg_in_use = MAX (initial_highest_arg_in_use, |
2768 | needed + 1); | |
51bbfa0c | 2769 | #else |
f73ad30e JH |
2770 | highest_outgoing_arg_in_use = MAX (initial_highest_arg_in_use, |
2771 | needed); | |
51bbfa0c | 2772 | #endif |
f8a097cd JH |
2773 | stack_usage_map |
2774 | = (char *) alloca (highest_outgoing_arg_in_use); | |
51bbfa0c | 2775 | |
f73ad30e | 2776 | if (initial_highest_arg_in_use) |
2e09e75a JM |
2777 | memcpy (stack_usage_map, initial_stack_usage_map, |
2778 | initial_highest_arg_in_use); | |
2f4aa534 | 2779 | |
f73ad30e | 2780 | if (initial_highest_arg_in_use != highest_outgoing_arg_in_use) |
961192e1 | 2781 | memset (&stack_usage_map[initial_highest_arg_in_use], 0, |
f73ad30e JH |
2782 | (highest_outgoing_arg_in_use |
2783 | - initial_highest_arg_in_use)); | |
2784 | needed = 0; | |
2f4aa534 | 2785 | |
f8a097cd JH |
2786 | /* The address of the outgoing argument list must not be |
2787 | copied to a register here, because argblock would be left | |
2788 | pointing to the wrong place after the call to | |
f725a3ec | 2789 | allocate_dynamic_stack_space below. */ |
2f4aa534 | 2790 | |
f73ad30e | 2791 | argblock = virtual_outgoing_args_rtx; |
f725a3ec | 2792 | } |
f73ad30e | 2793 | else |
26a258fe | 2794 | { |
f73ad30e | 2795 | if (inhibit_defer_pop == 0) |
0a1c58a2 | 2796 | { |
f73ad30e | 2797 | /* Try to reuse some or all of the pending_stack_adjust |
ce48579b RH |
2798 | to get this space. */ |
2799 | needed | |
f725a3ec | 2800 | = (combine_pending_stack_adjustment_and_call |
ce48579b | 2801 | (unadjusted_args_size, |
099e9712 | 2802 | &adjusted_args_size, |
ce48579b RH |
2803 | preferred_unit_stack_boundary)); |
2804 | ||
2805 | /* combine_pending_stack_adjustment_and_call computes | |
2806 | an adjustment before the arguments are allocated. | |
2807 | Account for them and see whether or not the stack | |
2808 | needs to go up or down. */ | |
2809 | needed = unadjusted_args_size - needed; | |
2810 | ||
2811 | if (needed < 0) | |
f73ad30e | 2812 | { |
ce48579b RH |
2813 | /* We're releasing stack space. */ |
2814 | /* ??? We can avoid any adjustment at all if we're | |
2815 | already aligned. FIXME. */ | |
2816 | pending_stack_adjust = -needed; | |
2817 | do_pending_stack_adjust (); | |
f73ad30e JH |
2818 | needed = 0; |
2819 | } | |
f725a3ec | 2820 | else |
ce48579b RH |
2821 | /* We need to allocate space. We'll do that in |
2822 | push_block below. */ | |
2823 | pending_stack_adjust = 0; | |
0a1c58a2 | 2824 | } |
ce48579b RH |
2825 | |
2826 | /* Special case this because overhead of `push_block' in | |
2827 | this case is non-trivial. */ | |
f73ad30e JH |
2828 | if (needed == 0) |
2829 | argblock = virtual_outgoing_args_rtx; | |
0a1c58a2 | 2830 | else |
f73ad30e JH |
2831 | argblock = push_block (GEN_INT (needed), 0, 0); |
2832 | ||
f8a097cd JH |
2833 | /* We only really need to call `copy_to_reg' in the case |
2834 | where push insns are going to be used to pass ARGBLOCK | |
2835 | to a function call in ARGS. In that case, the stack | |
2836 | pointer changes value from the allocation point to the | |
2837 | call point, and hence the value of | |
2838 | VIRTUAL_OUTGOING_ARGS_RTX changes as well. But might | |
2839 | as well always do it. */ | |
f73ad30e | 2840 | argblock = copy_to_reg (argblock); |
38afb23f OH |
2841 | } |
2842 | } | |
2843 | } | |
0a1c58a2 | 2844 | |
38afb23f OH |
2845 | if (ACCUMULATE_OUTGOING_ARGS) |
2846 | { | |
2847 | /* The save/restore code in store_one_arg handles all | |
2848 | cases except one: a constructor call (including a C | |
2849 | function returning a BLKmode struct) to initialize | |
2850 | an argument. */ | |
2851 | if (stack_arg_under_construction) | |
2852 | { | |
e5e809f4 | 2853 | #ifndef OUTGOING_REG_PARM_STACK_SPACE |
38afb23f OH |
2854 | rtx push_size = GEN_INT (reg_parm_stack_space |
2855 | + adjusted_args_size.constant); | |
bfbf933a | 2856 | #else |
38afb23f | 2857 | rtx push_size = GEN_INT (adjusted_args_size.constant); |
bfbf933a | 2858 | #endif |
38afb23f OH |
2859 | if (old_stack_level == 0) |
2860 | { | |
2861 | emit_stack_save (SAVE_BLOCK, &old_stack_level, | |
2862 | NULL_RTX); | |
2863 | old_stack_pointer_delta = stack_pointer_delta; | |
2864 | old_pending_adj = pending_stack_adjust; | |
2865 | pending_stack_adjust = 0; | |
2866 | /* stack_arg_under_construction says whether a stack | |
2867 | arg is being constructed at the old stack level. | |
2868 | Pushing the stack gets a clean outgoing argument | |
2869 | block. */ | |
2870 | old_stack_arg_under_construction | |
2871 | = stack_arg_under_construction; | |
2872 | stack_arg_under_construction = 0; | |
2873 | /* Make a new map for the new argument list. */ | |
2874 | stack_usage_map = (char *) | |
2875 | alloca (highest_outgoing_arg_in_use); | |
2876 | memset (stack_usage_map, 0, highest_outgoing_arg_in_use); | |
2877 | highest_outgoing_arg_in_use = 0; | |
f73ad30e | 2878 | } |
38afb23f OH |
2879 | allocate_dynamic_stack_space (push_size, NULL_RTX, |
2880 | BITS_PER_UNIT); | |
0a1c58a2 | 2881 | } |
bfbf933a | 2882 | |
38afb23f OH |
2883 | /* If argument evaluation might modify the stack pointer, |
2884 | copy the address of the argument list to a register. */ | |
2885 | for (i = 0; i < num_actuals; i++) | |
2886 | if (args[i].pass_on_stack) | |
2887 | { | |
2888 | argblock = copy_addr_to_reg (argblock); | |
2889 | break; | |
2890 | } | |
2891 | } | |
2892 | ||
0a1c58a2 | 2893 | compute_argument_addresses (args, argblock, num_actuals); |
bfbf933a | 2894 | |
0a1c58a2 JL |
2895 | /* If we push args individually in reverse order, perform stack alignment |
2896 | before the first push (the last arg). */ | |
f73ad30e | 2897 | if (PUSH_ARGS_REVERSED && argblock == 0 |
099e9712 | 2898 | && adjusted_args_size.constant != unadjusted_args_size) |
4e217aed | 2899 | { |
0a1c58a2 JL |
2900 | /* When the stack adjustment is pending, we get better code |
2901 | by combining the adjustments. */ | |
f725a3ec | 2902 | if (pending_stack_adjust |
53d4257f | 2903 | && ! (flags & ECF_LIBCALL_BLOCK) |
0a1c58a2 | 2904 | && ! inhibit_defer_pop) |
ce48579b RH |
2905 | { |
2906 | pending_stack_adjust | |
f725a3ec | 2907 | = (combine_pending_stack_adjustment_and_call |
ce48579b | 2908 | (unadjusted_args_size, |
099e9712 | 2909 | &adjusted_args_size, |
ce48579b RH |
2910 | preferred_unit_stack_boundary)); |
2911 | do_pending_stack_adjust (); | |
2912 | } | |
0a1c58a2 | 2913 | else if (argblock == 0) |
099e9712 | 2914 | anti_adjust_stack (GEN_INT (adjusted_args_size.constant |
0a1c58a2 | 2915 | - unadjusted_args_size)); |
0a1c58a2 | 2916 | } |
ebcd0b57 JH |
2917 | /* Now that the stack is properly aligned, pops can't safely |
2918 | be deferred during the evaluation of the arguments. */ | |
2919 | NO_DEFER_POP; | |
51bbfa0c | 2920 | |
09e2bf48 | 2921 | funexp = rtx_for_function_call (fndecl, addr); |
51bbfa0c | 2922 | |
0a1c58a2 JL |
2923 | /* Figure out the register where the value, if any, will come back. */ |
2924 | valreg = 0; | |
2925 | if (TYPE_MODE (TREE_TYPE (exp)) != VOIDmode | |
2926 | && ! structure_value_addr) | |
2927 | { | |
2928 | if (pcc_struct_value) | |
2929 | valreg = hard_function_value (build_pointer_type (TREE_TYPE (exp)), | |
7d167afd | 2930 | fndecl, (pass == 0)); |
0a1c58a2 | 2931 | else |
7d167afd | 2932 | valreg = hard_function_value (TREE_TYPE (exp), fndecl, (pass == 0)); |
0a1c58a2 | 2933 | } |
51bbfa0c | 2934 | |
0a1c58a2 JL |
2935 | /* Precompute all register parameters. It isn't safe to compute anything |
2936 | once we have started filling any specific hard regs. */ | |
2937 | precompute_register_parameters (num_actuals, args, ®_parm_seen); | |
51bbfa0c | 2938 | |
f73ad30e | 2939 | #ifdef REG_PARM_STACK_SPACE |
0a1c58a2 JL |
2940 | /* Save the fixed argument area if it's part of the caller's frame and |
2941 | is clobbered by argument setup for this call. */ | |
f8a097cd | 2942 | if (ACCUMULATE_OUTGOING_ARGS && pass) |
f73ad30e JH |
2943 | save_area = save_fixed_argument_area (reg_parm_stack_space, argblock, |
2944 | &low_to_save, &high_to_save); | |
b94301c2 | 2945 | #endif |
51bbfa0c | 2946 | |
0a1c58a2 JL |
2947 | /* Now store (and compute if necessary) all non-register parms. |
2948 | These come before register parms, since they can require block-moves, | |
2949 | which could clobber the registers used for register parms. | |
2950 | Parms which have partial registers are not stored here, | |
2951 | but we do preallocate space here if they want that. */ | |
51bbfa0c | 2952 | |
0a1c58a2 JL |
2953 | for (i = 0; i < num_actuals; i++) |
2954 | if (args[i].reg == 0 || args[i].pass_on_stack) | |
c67846f2 JJ |
2955 | { |
2956 | rtx before_arg = get_last_insn (); | |
2957 | ||
4c6b3b2a JJ |
2958 | if (store_one_arg (&args[i], argblock, flags, |
2959 | adjusted_args_size.var != 0, | |
2960 | reg_parm_stack_space) | |
2961 | || (pass == 0 | |
2962 | && check_sibcall_argument_overlap (before_arg, | |
0cdca92b | 2963 | &args[i], 1))) |
c67846f2 JJ |
2964 | sibcall_failure = 1; |
2965 | } | |
0a1c58a2 JL |
2966 | |
2967 | /* If we have a parm that is passed in registers but not in memory | |
2968 | and whose alignment does not permit a direct copy into registers, | |
2969 | make a group of pseudos that correspond to each register that we | |
2970 | will later fill. */ | |
2971 | if (STRICT_ALIGNMENT) | |
2972 | store_unaligned_arguments_into_pseudos (args, num_actuals); | |
2973 | ||
2974 | /* Now store any partially-in-registers parm. | |
2975 | This is the last place a block-move can happen. */ | |
2976 | if (reg_parm_seen) | |
2977 | for (i = 0; i < num_actuals; i++) | |
2978 | if (args[i].partial != 0 && ! args[i].pass_on_stack) | |
c67846f2 JJ |
2979 | { |
2980 | rtx before_arg = get_last_insn (); | |
2981 | ||
4c6b3b2a JJ |
2982 | if (store_one_arg (&args[i], argblock, flags, |
2983 | adjusted_args_size.var != 0, | |
2984 | reg_parm_stack_space) | |
2985 | || (pass == 0 | |
2986 | && check_sibcall_argument_overlap (before_arg, | |
0cdca92b | 2987 | &args[i], 1))) |
c67846f2 JJ |
2988 | sibcall_failure = 1; |
2989 | } | |
51bbfa0c | 2990 | |
0a1c58a2 JL |
2991 | /* If we pushed args in forward order, perform stack alignment |
2992 | after pushing the last arg. */ | |
f73ad30e | 2993 | if (!PUSH_ARGS_REVERSED && argblock == 0) |
099e9712 | 2994 | anti_adjust_stack (GEN_INT (adjusted_args_size.constant |
0a1c58a2 | 2995 | - unadjusted_args_size)); |
51bbfa0c | 2996 | |
0a1c58a2 JL |
2997 | /* If register arguments require space on the stack and stack space |
2998 | was not preallocated, allocate stack space here for arguments | |
2999 | passed in registers. */ | |
f73ad30e JH |
3000 | #ifdef OUTGOING_REG_PARM_STACK_SPACE |
3001 | if (!ACCUMULATE_OUTGOING_ARGS | |
f725a3ec | 3002 | && must_preallocate == 0 && reg_parm_stack_space > 0) |
0a1c58a2 | 3003 | anti_adjust_stack (GEN_INT (reg_parm_stack_space)); |
756e0e12 RS |
3004 | #endif |
3005 | ||
0a1c58a2 JL |
3006 | /* Pass the function the address in which to return a |
3007 | structure value. */ | |
3008 | if (pass != 0 && structure_value_addr && ! structure_value_addr_parm) | |
3009 | { | |
3010 | emit_move_insn (struct_value_rtx, | |
3011 | force_reg (Pmode, | |
3012 | force_operand (structure_value_addr, | |
3013 | NULL_RTX))); | |
3014 | ||
0a1c58a2 JL |
3015 | if (GET_CODE (struct_value_rtx) == REG) |
3016 | use_reg (&call_fusage, struct_value_rtx); | |
3017 | } | |
c2939b57 | 3018 | |
0a1c58a2 | 3019 | funexp = prepare_call_address (funexp, fndecl, &call_fusage, |
3affaf29 | 3020 | reg_parm_seen, pass == 0); |
51bbfa0c | 3021 | |
0cdca92b DJ |
3022 | load_register_parameters (args, num_actuals, &call_fusage, flags, |
3023 | pass == 0, &sibcall_failure); | |
f725a3ec | 3024 | |
0a1c58a2 JL |
3025 | /* Perform postincrements before actually calling the function. */ |
3026 | emit_queue (); | |
51bbfa0c | 3027 | |
0a1c58a2 JL |
3028 | /* Save a pointer to the last insn before the call, so that we can |
3029 | later safely search backwards to find the CALL_INSN. */ | |
3030 | before_call = get_last_insn (); | |
51bbfa0c | 3031 | |
7d167afd JJ |
3032 | /* Set up next argument register. For sibling calls on machines |
3033 | with register windows this should be the incoming register. */ | |
3034 | #ifdef FUNCTION_INCOMING_ARG | |
3035 | if (pass == 0) | |
3036 | next_arg_reg = FUNCTION_INCOMING_ARG (args_so_far, VOIDmode, | |
3037 | void_type_node, 1); | |
3038 | else | |
3039 | #endif | |
3040 | next_arg_reg = FUNCTION_ARG (args_so_far, VOIDmode, | |
3041 | void_type_node, 1); | |
3042 | ||
0a1c58a2 JL |
3043 | /* All arguments and registers used for the call must be set up by |
3044 | now! */ | |
3045 | ||
ce48579b RH |
3046 | /* Stack must be properly aligned now. */ |
3047 | if (pass && stack_pointer_delta % preferred_unit_stack_boundary) | |
d9a7d592 | 3048 | abort (); |
ebcd0b57 | 3049 | |
0a1c58a2 JL |
3050 | /* Generate the actual call instruction. */ |
3051 | emit_call_1 (funexp, fndecl, funtype, unadjusted_args_size, | |
099e9712 | 3052 | adjusted_args_size.constant, struct_value_size, |
7d167afd | 3053 | next_arg_reg, valreg, old_inhibit_defer_pop, call_fusage, |
fa5322fa | 3054 | flags, & args_so_far); |
0a1c58a2 JL |
3055 | |
3056 | /* If call is cse'able, make appropriate pair of reg-notes around it. | |
3057 | Test valreg so we don't crash; may safely ignore `const' | |
3058 | if return type is void. Disable for PARALLEL return values, because | |
3059 | we have no way to move such values into a pseudo register. */ | |
53d4257f | 3060 | if (pass && (flags & ECF_LIBCALL_BLOCK)) |
9ae8ffe7 | 3061 | { |
0a1c58a2 | 3062 | rtx insns; |
9ae8ffe7 | 3063 | |
e4abc3d5 RH |
3064 | if (valreg == 0 || GET_CODE (valreg) == PARALLEL) |
3065 | { | |
3066 | insns = get_insns (); | |
3067 | end_sequence (); | |
2f937369 | 3068 | emit_insn (insns); |
e4abc3d5 RH |
3069 | } |
3070 | else | |
3071 | { | |
3072 | rtx note = 0; | |
3073 | rtx temp = gen_reg_rtx (GET_MODE (valreg)); | |
3074 | ||
3075 | /* Mark the return value as a pointer if needed. */ | |
3076 | if (TREE_CODE (TREE_TYPE (exp)) == POINTER_TYPE) | |
3077 | mark_reg_pointer (temp, | |
3078 | TYPE_ALIGN (TREE_TYPE (TREE_TYPE (exp)))); | |
3079 | ||
3080 | /* Construct an "equal form" for the value which mentions all the | |
3081 | arguments in order as well as the function name. */ | |
3082 | for (i = 0; i < num_actuals; i++) | |
3083 | note = gen_rtx_EXPR_LIST (VOIDmode, | |
3084 | args[i].initial_value, note); | |
3085 | note = gen_rtx_EXPR_LIST (VOIDmode, funexp, note); | |
3086 | ||
3087 | insns = get_insns (); | |
3088 | end_sequence (); | |
3089 | ||
3090 | if (flags & ECF_PURE) | |
3091 | note = gen_rtx_EXPR_LIST (VOIDmode, | |
3092 | gen_rtx_USE (VOIDmode, | |
3093 | gen_rtx_MEM (BLKmode, | |
3094 | gen_rtx_SCRATCH (VOIDmode))), | |
3095 | note); | |
3096 | ||
3097 | emit_libcall_block (insns, temp, valreg, note); | |
3098 | ||
3099 | valreg = temp; | |
3100 | } | |
0a1c58a2 | 3101 | } |
53d4257f | 3102 | else if (pass && (flags & ECF_MALLOC)) |
0a1c58a2 JL |
3103 | { |
3104 | rtx temp = gen_reg_rtx (GET_MODE (valreg)); | |
3105 | rtx last, insns; | |
3106 | ||
f725a3ec | 3107 | /* The return value from a malloc-like function is a pointer. */ |
0a1c58a2 | 3108 | if (TREE_CODE (TREE_TYPE (exp)) == POINTER_TYPE) |
bdb429a5 | 3109 | mark_reg_pointer (temp, BIGGEST_ALIGNMENT); |
0a1c58a2 JL |
3110 | |
3111 | emit_move_insn (temp, valreg); | |
3112 | ||
3113 | /* The return value from a malloc-like function can not alias | |
3114 | anything else. */ | |
3115 | last = get_last_insn (); | |
f725a3ec | 3116 | REG_NOTES (last) = |
0a1c58a2 JL |
3117 | gen_rtx_EXPR_LIST (REG_NOALIAS, temp, REG_NOTES (last)); |
3118 | ||
3119 | /* Write out the sequence. */ | |
3120 | insns = get_insns (); | |
3121 | end_sequence (); | |
2f937369 | 3122 | emit_insn (insns); |
0a1c58a2 JL |
3123 | valreg = temp; |
3124 | } | |
51bbfa0c | 3125 | |
0a1c58a2 JL |
3126 | /* For calls to `setjmp', etc., inform flow.c it should complain |
3127 | if nonvolatile values are live. For functions that cannot return, | |
3128 | inform flow that control does not fall through. */ | |
51bbfa0c | 3129 | |
570a98eb | 3130 | if ((flags & (ECF_NORETURN | ECF_LONGJMP)) || pass == 0) |
c2939b57 | 3131 | { |
570a98eb | 3132 | /* The barrier must be emitted |
0a1c58a2 JL |
3133 | immediately after the CALL_INSN. Some ports emit more |
3134 | than just a CALL_INSN above, so we must search for it here. */ | |
51bbfa0c | 3135 | |
0a1c58a2 JL |
3136 | rtx last = get_last_insn (); |
3137 | while (GET_CODE (last) != CALL_INSN) | |
3138 | { | |
3139 | last = PREV_INSN (last); | |
3140 | /* There was no CALL_INSN? */ | |
3141 | if (last == before_call) | |
3142 | abort (); | |
3143 | } | |
51bbfa0c | 3144 | |
570a98eb | 3145 | emit_barrier_after (last); |
0a1c58a2 | 3146 | } |
51bbfa0c | 3147 | |
f2d33f13 | 3148 | if (flags & ECF_LONGJMP) |
099e9712 | 3149 | current_function_calls_longjmp = 1; |
51bbfa0c | 3150 | |
0a1c58a2 | 3151 | /* If value type not void, return an rtx for the value. */ |
51bbfa0c | 3152 | |
0a1c58a2 JL |
3153 | /* If there are cleanups to be called, don't use a hard reg as target. |
3154 | We need to double check this and see if it matters anymore. */ | |
194c7c45 RH |
3155 | if (any_pending_cleanups (1)) |
3156 | { | |
3157 | if (target && REG_P (target) | |
3158 | && REGNO (target) < FIRST_PSEUDO_REGISTER) | |
3159 | target = 0; | |
3160 | sibcall_failure = 1; | |
3161 | } | |
51bbfa0c | 3162 | |
0a1c58a2 JL |
3163 | if (TYPE_MODE (TREE_TYPE (exp)) == VOIDmode |
3164 | || ignore) | |
b5cd4ed4 | 3165 | target = const0_rtx; |
0a1c58a2 JL |
3166 | else if (structure_value_addr) |
3167 | { | |
3168 | if (target == 0 || GET_CODE (target) != MEM) | |
3169 | { | |
3bdf5ad1 RK |
3170 | target |
3171 | = gen_rtx_MEM (TYPE_MODE (TREE_TYPE (exp)), | |
3172 | memory_address (TYPE_MODE (TREE_TYPE (exp)), | |
3173 | structure_value_addr)); | |
3174 | set_mem_attributes (target, exp, 1); | |
0a1c58a2 JL |
3175 | } |
3176 | } | |
3177 | else if (pcc_struct_value) | |
cacbd532 | 3178 | { |
0a1c58a2 JL |
3179 | /* This is the special C++ case where we need to |
3180 | know what the true target was. We take care to | |
3181 | never use this value more than once in one expression. */ | |
3182 | target = gen_rtx_MEM (TYPE_MODE (TREE_TYPE (exp)), | |
3183 | copy_to_reg (valreg)); | |
3bdf5ad1 | 3184 | set_mem_attributes (target, exp, 1); |
cacbd532 | 3185 | } |
0a1c58a2 JL |
3186 | /* Handle calls that return values in multiple non-contiguous locations. |
3187 | The Irix 6 ABI has examples of this. */ | |
3188 | else if (GET_CODE (valreg) == PARALLEL) | |
3189 | { | |
0a1c58a2 JL |
3190 | if (target == 0) |
3191 | { | |
1da68f56 RK |
3192 | /* This will only be assigned once, so it can be readonly. */ |
3193 | tree nt = build_qualified_type (TREE_TYPE (exp), | |
3194 | (TYPE_QUALS (TREE_TYPE (exp)) | |
3195 | | TYPE_QUAL_CONST)); | |
3196 | ||
3197 | target = assign_temp (nt, 0, 1, 1); | |
0a1c58a2 JL |
3198 | preserve_temp_slots (target); |
3199 | } | |
3200 | ||
3201 | if (! rtx_equal_p (target, valreg)) | |
1da68f56 | 3202 | emit_group_store (target, valreg, |
04050c69 | 3203 | int_size_in_bytes (TREE_TYPE (exp))); |
19caa751 | 3204 | |
0a1c58a2 JL |
3205 | /* We can not support sibling calls for this case. */ |
3206 | sibcall_failure = 1; | |
3207 | } | |
3208 | else if (target | |
3209 | && GET_MODE (target) == TYPE_MODE (TREE_TYPE (exp)) | |
3210 | && GET_MODE (target) == GET_MODE (valreg)) | |
3211 | { | |
3212 | /* TARGET and VALREG cannot be equal at this point because the | |
3213 | latter would not have REG_FUNCTION_VALUE_P true, while the | |
3214 | former would if it were referring to the same register. | |
3215 | ||
3216 | If they refer to the same register, this move will be a no-op, | |
3217 | except when function inlining is being done. */ | |
3218 | emit_move_insn (target, valreg); | |
0219237c OH |
3219 | |
3220 | /* If we are setting a MEM, this code must be executed. Since it is | |
3221 | emitted after the call insn, sibcall optimization cannot be | |
3222 | performed in that case. */ | |
3223 | if (GET_CODE (target) == MEM) | |
3224 | sibcall_failure = 1; | |
0a1c58a2 JL |
3225 | } |
3226 | else if (TYPE_MODE (TREE_TYPE (exp)) == BLKmode) | |
8eb99146 RH |
3227 | { |
3228 | target = copy_blkmode_from_reg (target, valreg, TREE_TYPE (exp)); | |
3229 | ||
3230 | /* We can not support sibling calls for this case. */ | |
3231 | sibcall_failure = 1; | |
3232 | } | |
0a1c58a2 JL |
3233 | else |
3234 | target = copy_to_reg (valreg); | |
51bbfa0c | 3235 | |
84b55618 | 3236 | #ifdef PROMOTE_FUNCTION_RETURN |
0a1c58a2 JL |
3237 | /* If we promoted this return value, make the proper SUBREG. TARGET |
3238 | might be const0_rtx here, so be careful. */ | |
3239 | if (GET_CODE (target) == REG | |
3240 | && TYPE_MODE (TREE_TYPE (exp)) != BLKmode | |
3241 | && GET_MODE (target) != TYPE_MODE (TREE_TYPE (exp))) | |
3242 | { | |
3243 | tree type = TREE_TYPE (exp); | |
3244 | int unsignedp = TREE_UNSIGNED (type); | |
ddef6bc7 | 3245 | int offset = 0; |
84b55618 | 3246 | |
0a1c58a2 JL |
3247 | /* If we don't promote as expected, something is wrong. */ |
3248 | if (GET_MODE (target) | |
3249 | != promote_mode (type, TYPE_MODE (type), &unsignedp, 1)) | |
3250 | abort (); | |
5d2ac65e | 3251 | |
ddef6bc7 JJ |
3252 | if ((WORDS_BIG_ENDIAN || BYTES_BIG_ENDIAN) |
3253 | && GET_MODE_SIZE (GET_MODE (target)) | |
3254 | > GET_MODE_SIZE (TYPE_MODE (type))) | |
3255 | { | |
3256 | offset = GET_MODE_SIZE (GET_MODE (target)) | |
3257 | - GET_MODE_SIZE (TYPE_MODE (type)); | |
3258 | if (! BYTES_BIG_ENDIAN) | |
3259 | offset = (offset / UNITS_PER_WORD) * UNITS_PER_WORD; | |
3260 | else if (! WORDS_BIG_ENDIAN) | |
3261 | offset %= UNITS_PER_WORD; | |
3262 | } | |
3263 | target = gen_rtx_SUBREG (TYPE_MODE (type), target, offset); | |
0a1c58a2 | 3264 | SUBREG_PROMOTED_VAR_P (target) = 1; |
7879b81e | 3265 | SUBREG_PROMOTED_UNSIGNED_SET (target, unsignedp); |
0a1c58a2 | 3266 | } |
84b55618 RK |
3267 | #endif |
3268 | ||
0a1c58a2 JL |
3269 | /* If size of args is variable or this was a constructor call for a stack |
3270 | argument, restore saved stack-pointer value. */ | |
51bbfa0c | 3271 | |
7393c642 | 3272 | if (old_stack_level && ! (flags & ECF_SP_DEPRESSED)) |
0a1c58a2 JL |
3273 | { |
3274 | emit_stack_restore (SAVE_BLOCK, old_stack_level, NULL_RTX); | |
38afb23f | 3275 | stack_pointer_delta = old_stack_pointer_delta; |
0a1c58a2 | 3276 | pending_stack_adjust = old_pending_adj; |
0a1c58a2 JL |
3277 | stack_arg_under_construction = old_stack_arg_under_construction; |
3278 | highest_outgoing_arg_in_use = initial_highest_arg_in_use; | |
3279 | stack_usage_map = initial_stack_usage_map; | |
0a1c58a2 JL |
3280 | sibcall_failure = 1; |
3281 | } | |
f8a097cd | 3282 | else if (ACCUMULATE_OUTGOING_ARGS && pass) |
0a1c58a2 | 3283 | { |
51bbfa0c | 3284 | #ifdef REG_PARM_STACK_SPACE |
0a1c58a2 | 3285 | if (save_area) |
b820d2b8 AM |
3286 | restore_fixed_argument_area (save_area, argblock, |
3287 | high_to_save, low_to_save); | |
b94301c2 | 3288 | #endif |
51bbfa0c | 3289 | |
0a1c58a2 JL |
3290 | /* If we saved any argument areas, restore them. */ |
3291 | for (i = 0; i < num_actuals; i++) | |
3292 | if (args[i].save_area) | |
3293 | { | |
3294 | enum machine_mode save_mode = GET_MODE (args[i].save_area); | |
3295 | rtx stack_area | |
3296 | = gen_rtx_MEM (save_mode, | |
3297 | memory_address (save_mode, | |
3298 | XEXP (args[i].stack_slot, 0))); | |
3299 | ||
3300 | if (save_mode != BLKmode) | |
3301 | emit_move_insn (stack_area, args[i].save_area); | |
3302 | else | |
44bb111a | 3303 | emit_block_move (stack_area, args[i].save_area, |
e7949876 | 3304 | GEN_INT (args[i].locate.size.constant), |
44bb111a | 3305 | BLOCK_OP_CALL_PARM); |
0a1c58a2 | 3306 | } |
51bbfa0c | 3307 | |
0a1c58a2 JL |
3308 | highest_outgoing_arg_in_use = initial_highest_arg_in_use; |
3309 | stack_usage_map = initial_stack_usage_map; | |
3310 | } | |
51bbfa0c | 3311 | |
f725a3ec | 3312 | /* If this was alloca, record the new stack level for nonlocal gotos. |
0a1c58a2 JL |
3313 | Check for the handler slots since we might not have a save area |
3314 | for non-local gotos. */ | |
59257ff7 | 3315 | |
f2d33f13 | 3316 | if ((flags & ECF_MAY_BE_ALLOCA) && nonlocal_goto_handler_slots != 0) |
0a1c58a2 | 3317 | emit_stack_save (SAVE_NONLOCAL, &nonlocal_goto_stack_level, NULL_RTX); |
51bbfa0c | 3318 | |
0a1c58a2 JL |
3319 | /* Free up storage we no longer need. */ |
3320 | for (i = 0; i < num_actuals; ++i) | |
3321 | if (args[i].aligned_regs) | |
3322 | free (args[i].aligned_regs); | |
3323 | ||
e245d3af RH |
3324 | if (pass == 0) |
3325 | { | |
3326 | /* Undo the fake expand_start_target_temps we did earlier. If | |
3327 | there had been any cleanups created, we've already set | |
3328 | sibcall_failure. */ | |
3329 | expand_end_target_temps (); | |
3330 | } | |
3331 | ||
ee960939 OH |
3332 | /* If this function is returning into a memory location marked as |
3333 | readonly, it means it is initializing that location. We normally treat | |
3334 | functions as not clobbering such locations, so we need to specify that | |
3335 | this one does. We do this by adding the appropriate CLOBBER to the | |
3336 | CALL_INSN function usage list. This cannot be done by emitting a | |
3337 | standalone CLOBBER after the call because the latter would be ignored | |
3338 | by at least the delay slot scheduling pass. We do this now instead of | |
3339 | adding to call_fusage before the call to emit_call_1 because TARGET | |
3340 | may be modified in the meantime. */ | |
3341 | if (structure_value_addr != 0 && target != 0 | |
3342 | && GET_CODE (target) == MEM && RTX_UNCHANGING_P (target)) | |
3343 | add_function_usage_to | |
3344 | (last_call_insn (), | |
3345 | gen_rtx_EXPR_LIST (VOIDmode, gen_rtx_CLOBBER (VOIDmode, target), | |
3346 | NULL_RTX)); | |
3347 | ||
0a1c58a2 JL |
3348 | insns = get_insns (); |
3349 | end_sequence (); | |
3350 | ||
3351 | if (pass == 0) | |
3352 | { | |
3353 | tail_call_insns = insns; | |
3354 | ||
0a1c58a2 JL |
3355 | /* Restore the pending stack adjustment now that we have |
3356 | finished generating the sibling call sequence. */ | |
1503a7ec | 3357 | |
0a1c58a2 | 3358 | pending_stack_adjust = save_pending_stack_adjust; |
1503a7ec | 3359 | stack_pointer_delta = save_stack_pointer_delta; |
099e9712 JH |
3360 | |
3361 | /* Prepare arg structure for next iteration. */ | |
f725a3ec | 3362 | for (i = 0; i < num_actuals; i++) |
099e9712 JH |
3363 | { |
3364 | args[i].value = 0; | |
3365 | args[i].aligned_regs = 0; | |
3366 | args[i].stack = 0; | |
3367 | } | |
c67846f2 JJ |
3368 | |
3369 | sbitmap_free (stored_args_map); | |
0a1c58a2 JL |
3370 | } |
3371 | else | |
38afb23f OH |
3372 | { |
3373 | normal_call_insns = insns; | |
3374 | ||
3375 | /* Verify that we've deallocated all the stack we used. */ | |
3376 | if (old_stack_allocated != | |
3377 | stack_pointer_delta - pending_stack_adjust) | |
3378 | abort (); | |
3379 | } | |
fadb729c JJ |
3380 | |
3381 | /* If something prevents making this a sibling call, | |
3382 | zero out the sequence. */ | |
3383 | if (sibcall_failure) | |
3384 | tail_call_insns = NULL_RTX; | |
0a1c58a2 JL |
3385 | } |
3386 | ||
3387 | /* The function optimize_sibling_and_tail_recursive_calls doesn't | |
3388 | handle CALL_PLACEHOLDERs inside other CALL_PLACEHOLDERs. This | |
3389 | can happen if the arguments to this function call an inline | |
3390 | function who's expansion contains another CALL_PLACEHOLDER. | |
3391 | ||
3392 | If there are any C_Ps in any of these sequences, replace them | |
f725a3ec | 3393 | with their normal call. */ |
0a1c58a2 JL |
3394 | |
3395 | for (insn = normal_call_insns; insn; insn = NEXT_INSN (insn)) | |
3396 | if (GET_CODE (insn) == CALL_INSN | |
3397 | && GET_CODE (PATTERN (insn)) == CALL_PLACEHOLDER) | |
3398 | replace_call_placeholder (insn, sibcall_use_normal); | |
3399 | ||
3400 | for (insn = tail_call_insns; insn; insn = NEXT_INSN (insn)) | |
3401 | if (GET_CODE (insn) == CALL_INSN | |
3402 | && GET_CODE (PATTERN (insn)) == CALL_PLACEHOLDER) | |
3403 | replace_call_placeholder (insn, sibcall_use_normal); | |
3404 | ||
3405 | for (insn = tail_recursion_insns; insn; insn = NEXT_INSN (insn)) | |
3406 | if (GET_CODE (insn) == CALL_INSN | |
3407 | && GET_CODE (PATTERN (insn)) == CALL_PLACEHOLDER) | |
3408 | replace_call_placeholder (insn, sibcall_use_normal); | |
3409 | ||
3410 | /* If this was a potential tail recursion site, then emit a | |
3411 | CALL_PLACEHOLDER with the normal and the tail recursion streams. | |
3412 | One of them will be selected later. */ | |
3413 | if (tail_recursion_insns || tail_call_insns) | |
3414 | { | |
3415 | /* The tail recursion label must be kept around. We could expose | |
3416 | its use in the CALL_PLACEHOLDER, but that creates unwanted edges | |
3417 | and makes determining true tail recursion sites difficult. | |
3418 | ||
3419 | So we set LABEL_PRESERVE_P here, then clear it when we select | |
3420 | one of the call sequences after rtl generation is complete. */ | |
3421 | if (tail_recursion_insns) | |
3422 | LABEL_PRESERVE_P (tail_recursion_label) = 1; | |
3423 | emit_call_insn (gen_rtx_CALL_PLACEHOLDER (VOIDmode, normal_call_insns, | |
3424 | tail_call_insns, | |
3425 | tail_recursion_insns, | |
3426 | tail_recursion_label)); | |
3427 | } | |
3428 | else | |
2f937369 | 3429 | emit_insn (normal_call_insns); |
51bbfa0c | 3430 | |
0a1c58a2 | 3431 | currently_expanding_call--; |
8e6a59fe | 3432 | |
7393c642 RK |
3433 | /* If this function returns with the stack pointer depressed, ensure |
3434 | this block saves and restores the stack pointer, show it was | |
3435 | changed, and adjust for any outgoing arg space. */ | |
3436 | if (flags & ECF_SP_DEPRESSED) | |
3437 | { | |
3438 | clear_pending_stack_adjust (); | |
3439 | emit_insn (gen_rtx (CLOBBER, VOIDmode, stack_pointer_rtx)); | |
3440 | emit_move_insn (virtual_stack_dynamic_rtx, stack_pointer_rtx); | |
3441 | save_stack_pointer (); | |
3442 | } | |
3443 | ||
51bbfa0c RS |
3444 | return target; |
3445 | } | |
3446 | \f | |
de76b467 | 3447 | /* Output a library call to function FUN (a SYMBOL_REF rtx). |
f725a3ec | 3448 | The RETVAL parameter specifies whether return value needs to be saved, other |
0407c02b | 3449 | parameters are documented in the emit_library_call function below. */ |
8ac61af7 | 3450 | |
de76b467 | 3451 | static rtx |
2a8f6b90 | 3452 | emit_library_call_value_1 (retval, orgfun, value, fn_type, outmode, nargs, p) |
de76b467 JH |
3453 | int retval; |
3454 | rtx orgfun; | |
3455 | rtx value; | |
ebb1b59a | 3456 | enum libcall_type fn_type; |
de76b467 JH |
3457 | enum machine_mode outmode; |
3458 | int nargs; | |
3459 | va_list p; | |
43bc5f13 | 3460 | { |
3c0fca12 RH |
3461 | /* Total size in bytes of all the stack-parms scanned so far. */ |
3462 | struct args_size args_size; | |
3463 | /* Size of arguments before any adjustments (such as rounding). */ | |
3464 | struct args_size original_args_size; | |
b3694847 | 3465 | int argnum; |
3c0fca12 RH |
3466 | rtx fun; |
3467 | int inc; | |
3468 | int count; | |
3c0fca12 RH |
3469 | rtx argblock = 0; |
3470 | CUMULATIVE_ARGS args_so_far; | |
f725a3ec KH |
3471 | struct arg |
3472 | { | |
3473 | rtx value; | |
3474 | enum machine_mode mode; | |
3475 | rtx reg; | |
3476 | int partial; | |
e7949876 | 3477 | struct locate_and_pad_arg_data locate; |
f725a3ec KH |
3478 | rtx save_area; |
3479 | }; | |
3c0fca12 RH |
3480 | struct arg *argvec; |
3481 | int old_inhibit_defer_pop = inhibit_defer_pop; | |
3482 | rtx call_fusage = 0; | |
3483 | rtx mem_value = 0; | |
5591ee6f | 3484 | rtx valreg; |
3c0fca12 RH |
3485 | int pcc_struct_value = 0; |
3486 | int struct_value_size = 0; | |
52a11cbf | 3487 | int flags; |
3c0fca12 | 3488 | int reg_parm_stack_space = 0; |
3c0fca12 | 3489 | int needed; |
695ee791 | 3490 | rtx before_call; |
b0c48229 | 3491 | tree tfom; /* type_for_mode (outmode, 0) */ |
3c0fca12 | 3492 | |
f73ad30e | 3493 | #ifdef REG_PARM_STACK_SPACE |
3c0fca12 RH |
3494 | /* Define the boundary of the register parm stack space that needs to be |
3495 | save, if any. */ | |
b820d2b8 | 3496 | int low_to_save, high_to_save; |
f725a3ec | 3497 | rtx save_area = 0; /* Place that it is saved. */ |
3c0fca12 RH |
3498 | #endif |
3499 | ||
3c0fca12 RH |
3500 | /* Size of the stack reserved for parameter registers. */ |
3501 | int initial_highest_arg_in_use = highest_outgoing_arg_in_use; | |
3502 | char *initial_stack_usage_map = stack_usage_map; | |
3c0fca12 RH |
3503 | |
3504 | #ifdef REG_PARM_STACK_SPACE | |
3505 | #ifdef MAYBE_REG_PARM_STACK_SPACE | |
3506 | reg_parm_stack_space = MAYBE_REG_PARM_STACK_SPACE; | |
3507 | #else | |
3508 | reg_parm_stack_space = REG_PARM_STACK_SPACE ((tree) 0); | |
3509 | #endif | |
3510 | #endif | |
3511 | ||
9555a122 | 3512 | /* By default, library functions can not throw. */ |
52a11cbf RH |
3513 | flags = ECF_NOTHROW; |
3514 | ||
9555a122 RH |
3515 | switch (fn_type) |
3516 | { | |
3517 | case LCT_NORMAL: | |
53d4257f | 3518 | break; |
9555a122 | 3519 | case LCT_CONST: |
53d4257f JH |
3520 | flags |= ECF_CONST; |
3521 | break; | |
9555a122 | 3522 | case LCT_PURE: |
53d4257f | 3523 | flags |= ECF_PURE; |
9555a122 RH |
3524 | break; |
3525 | case LCT_CONST_MAKE_BLOCK: | |
53d4257f | 3526 | flags |= ECF_CONST | ECF_LIBCALL_BLOCK; |
9555a122 RH |
3527 | break; |
3528 | case LCT_PURE_MAKE_BLOCK: | |
53d4257f | 3529 | flags |= ECF_PURE | ECF_LIBCALL_BLOCK; |
9555a122 RH |
3530 | break; |
3531 | case LCT_NORETURN: | |
3532 | flags |= ECF_NORETURN; | |
3533 | break; | |
3534 | case LCT_THROW: | |
3535 | flags = ECF_NORETURN; | |
3536 | break; | |
9d98f8f9 JH |
3537 | case LCT_ALWAYS_RETURN: |
3538 | flags = ECF_ALWAYS_RETURN; | |
3539 | break; | |
9defc9b7 RH |
3540 | case LCT_RETURNS_TWICE: |
3541 | flags = ECF_RETURNS_TWICE; | |
3542 | break; | |
9555a122 | 3543 | } |
3c0fca12 RH |
3544 | fun = orgfun; |
3545 | ||
3c0fca12 RH |
3546 | /* Ensure current function's preferred stack boundary is at least |
3547 | what we need. */ | |
3548 | if (cfun->preferred_stack_boundary < PREFERRED_STACK_BOUNDARY) | |
3549 | cfun->preferred_stack_boundary = PREFERRED_STACK_BOUNDARY; | |
3c0fca12 RH |
3550 | |
3551 | /* If this kind of value comes back in memory, | |
3552 | decide where in memory it should come back. */ | |
b0c48229 | 3553 | if (outmode != VOIDmode) |
3c0fca12 | 3554 | { |
b0c48229 NB |
3555 | tfom = (*lang_hooks.types.type_for_mode) (outmode, 0); |
3556 | if (aggregate_value_p (tfom)) | |
3557 | { | |
3c0fca12 | 3558 | #ifdef PCC_STATIC_STRUCT_RETURN |
b0c48229 NB |
3559 | rtx pointer_reg |
3560 | = hard_function_value (build_pointer_type (tfom), 0, 0); | |
3561 | mem_value = gen_rtx_MEM (outmode, pointer_reg); | |
3562 | pcc_struct_value = 1; | |
3563 | if (value == 0) | |
3564 | value = gen_reg_rtx (outmode); | |
3c0fca12 | 3565 | #else /* not PCC_STATIC_STRUCT_RETURN */ |
b0c48229 NB |
3566 | struct_value_size = GET_MODE_SIZE (outmode); |
3567 | if (value != 0 && GET_CODE (value) == MEM) | |
3568 | mem_value = value; | |
3569 | else | |
3570 | mem_value = assign_temp (tfom, 0, 1, 1); | |
3c0fca12 | 3571 | #endif |
b0c48229 NB |
3572 | /* This call returns a big structure. */ |
3573 | flags &= ~(ECF_CONST | ECF_PURE | ECF_LIBCALL_BLOCK); | |
3574 | } | |
3c0fca12 | 3575 | } |
b0c48229 NB |
3576 | else |
3577 | tfom = void_type_node; | |
3c0fca12 RH |
3578 | |
3579 | /* ??? Unfinished: must pass the memory address as an argument. */ | |
3580 | ||
3581 | /* Copy all the libcall-arguments out of the varargs data | |
3582 | and into a vector ARGVEC. | |
3583 | ||
3584 | Compute how to pass each argument. We only support a very small subset | |
3585 | of the full argument passing conventions to limit complexity here since | |
3586 | library functions shouldn't have many args. */ | |
3587 | ||
3588 | argvec = (struct arg *) alloca ((nargs + 1) * sizeof (struct arg)); | |
961192e1 | 3589 | memset ((char *) argvec, 0, (nargs + 1) * sizeof (struct arg)); |
3c0fca12 | 3590 | |
97fc4caf AO |
3591 | #ifdef INIT_CUMULATIVE_LIBCALL_ARGS |
3592 | INIT_CUMULATIVE_LIBCALL_ARGS (args_so_far, outmode, fun); | |
3593 | #else | |
3c0fca12 | 3594 | INIT_CUMULATIVE_ARGS (args_so_far, NULL_TREE, fun, 0); |
97fc4caf | 3595 | #endif |
3c0fca12 RH |
3596 | |
3597 | args_size.constant = 0; | |
3598 | args_size.var = 0; | |
3599 | ||
3600 | count = 0; | |
3601 | ||
ebb1b59a BS |
3602 | /* Now we are about to start emitting insns that can be deleted |
3603 | if a libcall is deleted. */ | |
53d4257f | 3604 | if (flags & ECF_LIBCALL_BLOCK) |
ebb1b59a BS |
3605 | start_sequence (); |
3606 | ||
3c0fca12 RH |
3607 | push_temp_slots (); |
3608 | ||
3609 | /* If there's a structure value address to be passed, | |
3610 | either pass it in the special place, or pass it as an extra argument. */ | |
3611 | if (mem_value && struct_value_rtx == 0 && ! pcc_struct_value) | |
3612 | { | |
3613 | rtx addr = XEXP (mem_value, 0); | |
3614 | nargs++; | |
3615 | ||
3616 | /* Make sure it is a reasonable operand for a move or push insn. */ | |
3617 | if (GET_CODE (addr) != REG && GET_CODE (addr) != MEM | |
3618 | && ! (CONSTANT_P (addr) && LEGITIMATE_CONSTANT_P (addr))) | |
3619 | addr = force_operand (addr, NULL_RTX); | |
3620 | ||
3621 | argvec[count].value = addr; | |
3622 | argvec[count].mode = Pmode; | |
3623 | argvec[count].partial = 0; | |
3624 | ||
3625 | argvec[count].reg = FUNCTION_ARG (args_so_far, Pmode, NULL_TREE, 1); | |
3626 | #ifdef FUNCTION_ARG_PARTIAL_NREGS | |
3627 | if (FUNCTION_ARG_PARTIAL_NREGS (args_so_far, Pmode, NULL_TREE, 1)) | |
3628 | abort (); | |
3629 | #endif | |
3630 | ||
3631 | locate_and_pad_parm (Pmode, NULL_TREE, | |
a4d5044f CM |
3632 | #ifdef STACK_PARMS_IN_REG_PARM_AREA |
3633 | 1, | |
3634 | #else | |
3635 | argvec[count].reg != 0, | |
3636 | #endif | |
e7949876 | 3637 | 0, NULL_TREE, &args_size, &argvec[count].locate); |
3c0fca12 | 3638 | |
3c0fca12 RH |
3639 | if (argvec[count].reg == 0 || argvec[count].partial != 0 |
3640 | || reg_parm_stack_space > 0) | |
e7949876 | 3641 | args_size.constant += argvec[count].locate.size.constant; |
3c0fca12 RH |
3642 | |
3643 | FUNCTION_ARG_ADVANCE (args_so_far, Pmode, (tree) 0, 1); | |
3644 | ||
3645 | count++; | |
3646 | } | |
3647 | ||
3648 | for (; count < nargs; count++) | |
3649 | { | |
3650 | rtx val = va_arg (p, rtx); | |
3651 | enum machine_mode mode = va_arg (p, enum machine_mode); | |
3652 | ||
3653 | /* We cannot convert the arg value to the mode the library wants here; | |
3654 | must do it earlier where we know the signedness of the arg. */ | |
3655 | if (mode == BLKmode | |
3656 | || (GET_MODE (val) != mode && GET_MODE (val) != VOIDmode)) | |
3657 | abort (); | |
3658 | ||
3659 | /* On some machines, there's no way to pass a float to a library fcn. | |
3660 | Pass it as a double instead. */ | |
3661 | #ifdef LIBGCC_NEEDS_DOUBLE | |
3662 | if (LIBGCC_NEEDS_DOUBLE && mode == SFmode) | |
3663 | val = convert_modes (DFmode, SFmode, val, 0), mode = DFmode; | |
3664 | #endif | |
3665 | ||
3666 | /* There's no need to call protect_from_queue, because | |
3667 | either emit_move_insn or emit_push_insn will do that. */ | |
3668 | ||
3669 | /* Make sure it is a reasonable operand for a move or push insn. */ | |
3670 | if (GET_CODE (val) != REG && GET_CODE (val) != MEM | |
3671 | && ! (CONSTANT_P (val) && LEGITIMATE_CONSTANT_P (val))) | |
3672 | val = force_operand (val, NULL_RTX); | |
3673 | ||
3674 | #ifdef FUNCTION_ARG_PASS_BY_REFERENCE | |
3675 | if (FUNCTION_ARG_PASS_BY_REFERENCE (args_so_far, mode, NULL_TREE, 1)) | |
3676 | { | |
f474c6f8 AO |
3677 | rtx slot; |
3678 | int must_copy = 1 | |
3679 | #ifdef FUNCTION_ARG_CALLEE_COPIES | |
3680 | && ! FUNCTION_ARG_CALLEE_COPIES (args_so_far, mode, | |
3681 | NULL_TREE, 1) | |
3682 | #endif | |
3683 | ; | |
3684 | ||
a0dc500c R |
3685 | /* loop.c won't look at CALL_INSN_FUNCTION_USAGE of const/pure |
3686 | functions, so we have to pretend this isn't such a function. */ | |
3687 | if (flags & ECF_LIBCALL_BLOCK) | |
3688 | { | |
3689 | rtx insns = get_insns (); | |
3690 | end_sequence (); | |
3691 | emit_insn (insns); | |
3692 | } | |
3693 | flags &= ~(ECF_CONST | ECF_PURE | ECF_LIBCALL_BLOCK); | |
3694 | ||
99a32567 DM |
3695 | /* If this was a CONST function, it is now PURE since |
3696 | it now reads memory. */ | |
3697 | if (flags & ECF_CONST) | |
3698 | { | |
3699 | flags &= ~ECF_CONST; | |
3700 | flags |= ECF_PURE; | |
3701 | } | |
3702 | ||
f474c6f8 AO |
3703 | if (GET_MODE (val) == MEM && ! must_copy) |
3704 | slot = val; | |
3705 | else if (must_copy) | |
3706 | { | |
b0c48229 NB |
3707 | slot = assign_temp ((*lang_hooks.types.type_for_mode) (mode, 0), |
3708 | 0, 1, 1); | |
f474c6f8 AO |
3709 | emit_move_insn (slot, val); |
3710 | } | |
3711 | else | |
3712 | { | |
b0c48229 | 3713 | tree type = (*lang_hooks.types.type_for_mode) (mode, 0); |
f474c6f8 | 3714 | |
546ff777 AM |
3715 | slot |
3716 | = gen_rtx_MEM (mode, | |
3717 | expand_expr (build1 (ADDR_EXPR, | |
3718 | build_pointer_type (type), | |
3719 | make_tree (type, val)), | |
3720 | NULL_RTX, VOIDmode, 0)); | |
f474c6f8 | 3721 | } |
1da68f56 | 3722 | |
6b5273c3 AO |
3723 | call_fusage = gen_rtx_EXPR_LIST (VOIDmode, |
3724 | gen_rtx_USE (VOIDmode, slot), | |
3725 | call_fusage); | |
f474c6f8 AO |
3726 | if (must_copy) |
3727 | call_fusage = gen_rtx_EXPR_LIST (VOIDmode, | |
3728 | gen_rtx_CLOBBER (VOIDmode, | |
3729 | slot), | |
3730 | call_fusage); | |
3731 | ||
3c0fca12 | 3732 | mode = Pmode; |
f474c6f8 | 3733 | val = force_operand (XEXP (slot, 0), NULL_RTX); |
3c0fca12 RH |
3734 | } |
3735 | #endif | |
3736 | ||
3737 | argvec[count].value = val; | |
3738 | argvec[count].mode = mode; | |
3739 | ||
3740 | argvec[count].reg = FUNCTION_ARG (args_so_far, mode, NULL_TREE, 1); | |
3741 | ||
3742 | #ifdef FUNCTION_ARG_PARTIAL_NREGS | |
3743 | argvec[count].partial | |
3744 | = FUNCTION_ARG_PARTIAL_NREGS (args_so_far, mode, NULL_TREE, 1); | |
3745 | #else | |
3746 | argvec[count].partial = 0; | |
3747 | #endif | |
3748 | ||
3749 | locate_and_pad_parm (mode, NULL_TREE, | |
a4d5044f | 3750 | #ifdef STACK_PARMS_IN_REG_PARM_AREA |
f725a3ec | 3751 | 1, |
a4d5044f CM |
3752 | #else |
3753 | argvec[count].reg != 0, | |
3754 | #endif | |
e7949876 AM |
3755 | argvec[count].partial, |
3756 | NULL_TREE, &args_size, &argvec[count].locate); | |
3c0fca12 | 3757 | |
e7949876 | 3758 | if (argvec[count].locate.size.var) |
3c0fca12 RH |
3759 | abort (); |
3760 | ||
3c0fca12 RH |
3761 | if (argvec[count].reg == 0 || argvec[count].partial != 0 |
3762 | || reg_parm_stack_space > 0) | |
e7949876 | 3763 | args_size.constant += argvec[count].locate.size.constant; |
3c0fca12 RH |
3764 | |
3765 | FUNCTION_ARG_ADVANCE (args_so_far, mode, (tree) 0, 1); | |
3766 | } | |
3c0fca12 RH |
3767 | |
3768 | #ifdef FINAL_REG_PARM_STACK_SPACE | |
3769 | reg_parm_stack_space = FINAL_REG_PARM_STACK_SPACE (args_size.constant, | |
3770 | args_size.var); | |
3771 | #endif | |
3772 | /* If this machine requires an external definition for library | |
3773 | functions, write one out. */ | |
3774 | assemble_external_libcall (fun); | |
3775 | ||
3776 | original_args_size = args_size; | |
1503a7ec JH |
3777 | args_size.constant = (((args_size.constant |
3778 | + stack_pointer_delta | |
3779 | + STACK_BYTES - 1) | |
3780 | / STACK_BYTES | |
3781 | * STACK_BYTES) | |
3782 | - stack_pointer_delta); | |
3c0fca12 RH |
3783 | |
3784 | args_size.constant = MAX (args_size.constant, | |
3785 | reg_parm_stack_space); | |
3786 | ||
3787 | #ifndef OUTGOING_REG_PARM_STACK_SPACE | |
3788 | args_size.constant -= reg_parm_stack_space; | |
3789 | #endif | |
3790 | ||
3791 | if (args_size.constant > current_function_outgoing_args_size) | |
3792 | current_function_outgoing_args_size = args_size.constant; | |
3793 | ||
f73ad30e JH |
3794 | if (ACCUMULATE_OUTGOING_ARGS) |
3795 | { | |
3796 | /* Since the stack pointer will never be pushed, it is possible for | |
3797 | the evaluation of a parm to clobber something we have already | |
3798 | written to the stack. Since most function calls on RISC machines | |
3799 | do not use the stack, this is uncommon, but must work correctly. | |
3c0fca12 | 3800 | |
f73ad30e JH |
3801 | Therefore, we save any area of the stack that was already written |
3802 | and that we are using. Here we set up to do this by making a new | |
3803 | stack usage map from the old one. | |
3c0fca12 | 3804 | |
f73ad30e JH |
3805 | Another approach might be to try to reorder the argument |
3806 | evaluations to avoid this conflicting stack usage. */ | |
3c0fca12 | 3807 | |
f73ad30e | 3808 | needed = args_size.constant; |
3c0fca12 RH |
3809 | |
3810 | #ifndef OUTGOING_REG_PARM_STACK_SPACE | |
f73ad30e JH |
3811 | /* Since we will be writing into the entire argument area, the |
3812 | map must be allocated for its entire size, not just the part that | |
3813 | is the responsibility of the caller. */ | |
3814 | needed += reg_parm_stack_space; | |
3c0fca12 RH |
3815 | #endif |
3816 | ||
3817 | #ifdef ARGS_GROW_DOWNWARD | |
f73ad30e JH |
3818 | highest_outgoing_arg_in_use = MAX (initial_highest_arg_in_use, |
3819 | needed + 1); | |
3c0fca12 | 3820 | #else |
f73ad30e JH |
3821 | highest_outgoing_arg_in_use = MAX (initial_highest_arg_in_use, |
3822 | needed); | |
3c0fca12 | 3823 | #endif |
f73ad30e | 3824 | stack_usage_map = (char *) alloca (highest_outgoing_arg_in_use); |
3c0fca12 | 3825 | |
f73ad30e | 3826 | if (initial_highest_arg_in_use) |
2e09e75a JM |
3827 | memcpy (stack_usage_map, initial_stack_usage_map, |
3828 | initial_highest_arg_in_use); | |
3c0fca12 | 3829 | |
f73ad30e | 3830 | if (initial_highest_arg_in_use != highest_outgoing_arg_in_use) |
961192e1 | 3831 | memset (&stack_usage_map[initial_highest_arg_in_use], 0, |
f73ad30e JH |
3832 | highest_outgoing_arg_in_use - initial_highest_arg_in_use); |
3833 | needed = 0; | |
3c0fca12 | 3834 | |
c39ada04 DD |
3835 | /* We must be careful to use virtual regs before they're instantiated, |
3836 | and real regs afterwards. Loop optimization, for example, can create | |
3837 | new libcalls after we've instantiated the virtual regs, and if we | |
3838 | use virtuals anyway, they won't match the rtl patterns. */ | |
3c0fca12 | 3839 | |
c39ada04 DD |
3840 | if (virtuals_instantiated) |
3841 | argblock = plus_constant (stack_pointer_rtx, STACK_POINTER_OFFSET); | |
3842 | else | |
3843 | argblock = virtual_outgoing_args_rtx; | |
f73ad30e JH |
3844 | } |
3845 | else | |
3846 | { | |
3847 | if (!PUSH_ARGS) | |
3848 | argblock = push_block (GEN_INT (args_size.constant), 0, 0); | |
3849 | } | |
3c0fca12 | 3850 | |
3c0fca12 RH |
3851 | /* If we push args individually in reverse order, perform stack alignment |
3852 | before the first push (the last arg). */ | |
f73ad30e | 3853 | if (argblock == 0 && PUSH_ARGS_REVERSED) |
3c0fca12 RH |
3854 | anti_adjust_stack (GEN_INT (args_size.constant |
3855 | - original_args_size.constant)); | |
3c0fca12 | 3856 | |
f73ad30e JH |
3857 | if (PUSH_ARGS_REVERSED) |
3858 | { | |
3859 | inc = -1; | |
3860 | argnum = nargs - 1; | |
3861 | } | |
3862 | else | |
3863 | { | |
3864 | inc = 1; | |
3865 | argnum = 0; | |
3866 | } | |
3c0fca12 | 3867 | |
f73ad30e JH |
3868 | #ifdef REG_PARM_STACK_SPACE |
3869 | if (ACCUMULATE_OUTGOING_ARGS) | |
3870 | { | |
3871 | /* The argument list is the property of the called routine and it | |
3872 | may clobber it. If the fixed area has been used for previous | |
b820d2b8 AM |
3873 | parameters, we must save and restore it. */ |
3874 | save_area = save_fixed_argument_area (reg_parm_stack_space, argblock, | |
3875 | &low_to_save, &high_to_save); | |
3c0fca12 RH |
3876 | } |
3877 | #endif | |
f725a3ec | 3878 | |
3c0fca12 RH |
3879 | /* Push the args that need to be pushed. */ |
3880 | ||
3881 | /* ARGNUM indexes the ARGVEC array in the order in which the arguments | |
3882 | are to be pushed. */ | |
3883 | for (count = 0; count < nargs; count++, argnum += inc) | |
3884 | { | |
b3694847 SS |
3885 | enum machine_mode mode = argvec[argnum].mode; |
3886 | rtx val = argvec[argnum].value; | |
3c0fca12 RH |
3887 | rtx reg = argvec[argnum].reg; |
3888 | int partial = argvec[argnum].partial; | |
f73ad30e | 3889 | int lower_bound = 0, upper_bound = 0, i; |
3c0fca12 RH |
3890 | |
3891 | if (! (reg != 0 && partial == 0)) | |
3892 | { | |
f73ad30e JH |
3893 | if (ACCUMULATE_OUTGOING_ARGS) |
3894 | { | |
f8a097cd JH |
3895 | /* If this is being stored into a pre-allocated, fixed-size, |
3896 | stack area, save any previous data at that location. */ | |
3c0fca12 RH |
3897 | |
3898 | #ifdef ARGS_GROW_DOWNWARD | |
f73ad30e JH |
3899 | /* stack_slot is negative, but we want to index stack_usage_map |
3900 | with positive values. */ | |
e7949876 AM |
3901 | upper_bound = -argvec[argnum].locate.offset.constant + 1; |
3902 | lower_bound = upper_bound - argvec[argnum].locate.size.constant; | |
3c0fca12 | 3903 | #else |
e7949876 AM |
3904 | lower_bound = argvec[argnum].locate.offset.constant; |
3905 | upper_bound = lower_bound + argvec[argnum].locate.size.constant; | |
3c0fca12 RH |
3906 | #endif |
3907 | ||
546ff777 AM |
3908 | i = lower_bound; |
3909 | /* Don't worry about things in the fixed argument area; | |
3910 | it has already been saved. */ | |
3911 | if (i < reg_parm_stack_space) | |
3912 | i = reg_parm_stack_space; | |
3913 | while (i < upper_bound && stack_usage_map[i] == 0) | |
3914 | i++; | |
3c0fca12 | 3915 | |
546ff777 | 3916 | if (i < upper_bound) |
f73ad30e | 3917 | { |
e7949876 AM |
3918 | /* We need to make a save area. */ |
3919 | unsigned int size | |
3920 | = argvec[argnum].locate.size.constant * BITS_PER_UNIT; | |
f73ad30e | 3921 | enum machine_mode save_mode |
e7949876 AM |
3922 | = mode_for_size (size, MODE_INT, 1); |
3923 | rtx adr | |
3924 | = plus_constant (argblock, | |
3925 | argvec[argnum].locate.offset.constant); | |
f73ad30e | 3926 | rtx stack_area |
e7949876 | 3927 | = gen_rtx_MEM (save_mode, memory_address (save_mode, adr)); |
f73ad30e JH |
3928 | argvec[argnum].save_area = gen_reg_rtx (save_mode); |
3929 | ||
3930 | emit_move_insn (argvec[argnum].save_area, stack_area); | |
3931 | } | |
3c0fca12 | 3932 | } |
19caa751 | 3933 | |
44bb111a RH |
3934 | emit_push_insn (val, mode, NULL_TREE, NULL_RTX, PARM_BOUNDARY, |
3935 | partial, reg, 0, argblock, | |
e7949876 AM |
3936 | GEN_INT (argvec[argnum].locate.offset.constant), |
3937 | reg_parm_stack_space, | |
3938 | ARGS_SIZE_RTX (argvec[argnum].locate.alignment_pad)); | |
3c0fca12 | 3939 | |
3c0fca12 | 3940 | /* Now mark the segment we just used. */ |
f73ad30e JH |
3941 | if (ACCUMULATE_OUTGOING_ARGS) |
3942 | for (i = lower_bound; i < upper_bound; i++) | |
3943 | stack_usage_map[i] = 1; | |
3c0fca12 RH |
3944 | |
3945 | NO_DEFER_POP; | |
3946 | } | |
3947 | } | |
3948 | ||
3c0fca12 RH |
3949 | /* If we pushed args in forward order, perform stack alignment |
3950 | after pushing the last arg. */ | |
f73ad30e | 3951 | if (argblock == 0 && !PUSH_ARGS_REVERSED) |
3c0fca12 RH |
3952 | anti_adjust_stack (GEN_INT (args_size.constant |
3953 | - original_args_size.constant)); | |
3c0fca12 | 3954 | |
f73ad30e JH |
3955 | if (PUSH_ARGS_REVERSED) |
3956 | argnum = nargs - 1; | |
3957 | else | |
3958 | argnum = 0; | |
3c0fca12 | 3959 | |
3affaf29 | 3960 | fun = prepare_call_address (fun, NULL_TREE, &call_fusage, 0, 0); |
3c0fca12 RH |
3961 | |
3962 | /* Now load any reg parms into their regs. */ | |
3963 | ||
3964 | /* ARGNUM indexes the ARGVEC array in the order in which the arguments | |
3965 | are to be pushed. */ | |
3966 | for (count = 0; count < nargs; count++, argnum += inc) | |
3967 | { | |
b3694847 | 3968 | rtx val = argvec[argnum].value; |
3c0fca12 RH |
3969 | rtx reg = argvec[argnum].reg; |
3970 | int partial = argvec[argnum].partial; | |
3971 | ||
3972 | /* Handle calls that pass values in multiple non-contiguous | |
3973 | locations. The PA64 has examples of this for library calls. */ | |
3974 | if (reg != 0 && GET_CODE (reg) == PARALLEL) | |
04050c69 | 3975 | emit_group_load (reg, val, GET_MODE_SIZE (GET_MODE (val))); |
3c0fca12 RH |
3976 | else if (reg != 0 && partial == 0) |
3977 | emit_move_insn (reg, val); | |
3978 | ||
3979 | NO_DEFER_POP; | |
3980 | } | |
3981 | ||
3c0fca12 RH |
3982 | /* Any regs containing parms remain in use through the call. */ |
3983 | for (count = 0; count < nargs; count++) | |
3984 | { | |
3985 | rtx reg = argvec[count].reg; | |
3986 | if (reg != 0 && GET_CODE (reg) == PARALLEL) | |
3987 | use_group_regs (&call_fusage, reg); | |
3988 | else if (reg != 0) | |
3989 | use_reg (&call_fusage, reg); | |
3990 | } | |
3991 | ||
3992 | /* Pass the function the address in which to return a structure value. */ | |
3993 | if (mem_value != 0 && struct_value_rtx != 0 && ! pcc_struct_value) | |
3994 | { | |
3995 | emit_move_insn (struct_value_rtx, | |
3996 | force_reg (Pmode, | |
3997 | force_operand (XEXP (mem_value, 0), | |
3998 | NULL_RTX))); | |
3999 | if (GET_CODE (struct_value_rtx) == REG) | |
f725a3ec | 4000 | use_reg (&call_fusage, struct_value_rtx); |
3c0fca12 RH |
4001 | } |
4002 | ||
4003 | /* Don't allow popping to be deferred, since then | |
4004 | cse'ing of library calls could delete a call and leave the pop. */ | |
4005 | NO_DEFER_POP; | |
5591ee6f JH |
4006 | valreg = (mem_value == 0 && outmode != VOIDmode |
4007 | ? hard_libcall_value (outmode) : NULL_RTX); | |
3c0fca12 | 4008 | |
ce48579b | 4009 | /* Stack must be properly aligned now. */ |
ebcd0b57 | 4010 | if (stack_pointer_delta & (PREFERRED_STACK_BOUNDARY / BITS_PER_UNIT - 1)) |
f725a3ec | 4011 | abort (); |
ebcd0b57 | 4012 | |
695ee791 RH |
4013 | before_call = get_last_insn (); |
4014 | ||
3c0fca12 RH |
4015 | /* We pass the old value of inhibit_defer_pop + 1 to emit_call_1, which |
4016 | will set inhibit_defer_pop to that value. */ | |
de76b467 JH |
4017 | /* The return type is needed to decide how many bytes the function pops. |
4018 | Signedness plays no role in that, so for simplicity, we pretend it's | |
4019 | always signed. We also assume that the list of arguments passed has | |
4020 | no impact, so we pretend it is unknown. */ | |
3c0fca12 | 4021 | |
f725a3ec KH |
4022 | emit_call_1 (fun, |
4023 | get_identifier (XSTR (orgfun, 0)), | |
b0c48229 | 4024 | build_function_type (tfom, NULL_TREE), |
f725a3ec | 4025 | original_args_size.constant, args_size.constant, |
3c0fca12 RH |
4026 | struct_value_size, |
4027 | FUNCTION_ARG (args_so_far, VOIDmode, void_type_node, 1), | |
5591ee6f | 4028 | valreg, |
fa5322fa | 4029 | old_inhibit_defer_pop + 1, call_fusage, flags, & args_so_far); |
3c0fca12 | 4030 | |
695ee791 RH |
4031 | /* For calls to `setjmp', etc., inform flow.c it should complain |
4032 | if nonvolatile values are live. For functions that cannot return, | |
4033 | inform flow that control does not fall through. */ | |
4034 | ||
570a98eb | 4035 | if (flags & (ECF_NORETURN | ECF_LONGJMP)) |
695ee791 | 4036 | { |
570a98eb | 4037 | /* The barrier note must be emitted |
695ee791 RH |
4038 | immediately after the CALL_INSN. Some ports emit more than |
4039 | just a CALL_INSN above, so we must search for it here. */ | |
4040 | ||
4041 | rtx last = get_last_insn (); | |
4042 | while (GET_CODE (last) != CALL_INSN) | |
4043 | { | |
4044 | last = PREV_INSN (last); | |
4045 | /* There was no CALL_INSN? */ | |
4046 | if (last == before_call) | |
4047 | abort (); | |
4048 | } | |
4049 | ||
570a98eb | 4050 | emit_barrier_after (last); |
695ee791 RH |
4051 | } |
4052 | ||
3c0fca12 RH |
4053 | /* Now restore inhibit_defer_pop to its actual original value. */ |
4054 | OK_DEFER_POP; | |
4055 | ||
ebb1b59a BS |
4056 | /* If call is cse'able, make appropriate pair of reg-notes around it. |
4057 | Test valreg so we don't crash; may safely ignore `const' | |
4058 | if return type is void. Disable for PARALLEL return values, because | |
4059 | we have no way to move such values into a pseudo register. */ | |
53d4257f | 4060 | if (flags & ECF_LIBCALL_BLOCK) |
ebb1b59a | 4061 | { |
ebb1b59a | 4062 | rtx insns; |
ebb1b59a | 4063 | |
c3297561 | 4064 | if (valreg == 0) |
e4abc3d5 RH |
4065 | { |
4066 | insns = get_insns (); | |
4067 | end_sequence (); | |
2f937369 | 4068 | emit_insn (insns); |
e4abc3d5 RH |
4069 | } |
4070 | else | |
4071 | { | |
4072 | rtx note = 0; | |
c3297561 | 4073 | rtx temp; |
e4abc3d5 | 4074 | int i; |
ebb1b59a | 4075 | |
c3297561 AO |
4076 | if (GET_CODE (valreg) == PARALLEL) |
4077 | { | |
4078 | temp = gen_reg_rtx (outmode); | |
4079 | emit_group_store (temp, valreg, outmode); | |
4080 | valreg = temp; | |
4081 | } | |
4082 | ||
4083 | temp = gen_reg_rtx (GET_MODE (valreg)); | |
4084 | ||
e4abc3d5 RH |
4085 | /* Construct an "equal form" for the value which mentions all the |
4086 | arguments in order as well as the function name. */ | |
4087 | for (i = 0; i < nargs; i++) | |
4088 | note = gen_rtx_EXPR_LIST (VOIDmode, argvec[i].value, note); | |
4089 | note = gen_rtx_EXPR_LIST (VOIDmode, fun, note); | |
ebb1b59a | 4090 | |
e4abc3d5 RH |
4091 | insns = get_insns (); |
4092 | end_sequence (); | |
ebb1b59a | 4093 | |
e4abc3d5 RH |
4094 | if (flags & ECF_PURE) |
4095 | note = gen_rtx_EXPR_LIST (VOIDmode, | |
4096 | gen_rtx_USE (VOIDmode, | |
4097 | gen_rtx_MEM (BLKmode, | |
4098 | gen_rtx_SCRATCH (VOIDmode))), | |
4099 | note); | |
4100 | ||
4101 | emit_libcall_block (insns, temp, valreg, note); | |
ebb1b59a | 4102 | |
e4abc3d5 RH |
4103 | valreg = temp; |
4104 | } | |
ebb1b59a | 4105 | } |
3c0fca12 RH |
4106 | pop_temp_slots (); |
4107 | ||
4108 | /* Copy the value to the right place. */ | |
de76b467 | 4109 | if (outmode != VOIDmode && retval) |
3c0fca12 RH |
4110 | { |
4111 | if (mem_value) | |
4112 | { | |
4113 | if (value == 0) | |
4114 | value = mem_value; | |
4115 | if (value != mem_value) | |
4116 | emit_move_insn (value, mem_value); | |
4117 | } | |
c3297561 AO |
4118 | else if (GET_CODE (valreg) == PARALLEL) |
4119 | { | |
4120 | if (value == 0) | |
4121 | value = gen_reg_rtx (outmode); | |
4122 | emit_group_store (value, valreg, outmode); | |
4123 | } | |
3c0fca12 | 4124 | else if (value != 0) |
d57551c7 | 4125 | emit_move_insn (value, valreg); |
3c0fca12 | 4126 | else |
d57551c7 | 4127 | value = valreg; |
3c0fca12 RH |
4128 | } |
4129 | ||
f73ad30e | 4130 | if (ACCUMULATE_OUTGOING_ARGS) |
3c0fca12 | 4131 | { |
f73ad30e JH |
4132 | #ifdef REG_PARM_STACK_SPACE |
4133 | if (save_area) | |
b820d2b8 AM |
4134 | restore_fixed_argument_area (save_area, argblock, |
4135 | high_to_save, low_to_save); | |
3c0fca12 | 4136 | #endif |
f725a3ec | 4137 | |
f73ad30e JH |
4138 | /* If we saved any argument areas, restore them. */ |
4139 | for (count = 0; count < nargs; count++) | |
4140 | if (argvec[count].save_area) | |
4141 | { | |
4142 | enum machine_mode save_mode = GET_MODE (argvec[count].save_area); | |
e7949876 AM |
4143 | rtx adr = plus_constant (argblock, |
4144 | argvec[count].locate.offset.constant); | |
4145 | rtx stack_area = gen_rtx_MEM (save_mode, | |
4146 | memory_address (save_mode, adr)); | |
f73ad30e JH |
4147 | |
4148 | emit_move_insn (stack_area, argvec[count].save_area); | |
4149 | } | |
3c0fca12 | 4150 | |
f73ad30e JH |
4151 | highest_outgoing_arg_in_use = initial_highest_arg_in_use; |
4152 | stack_usage_map = initial_stack_usage_map; | |
4153 | } | |
43bc5f13 | 4154 | |
de76b467 JH |
4155 | return value; |
4156 | ||
4157 | } | |
4158 | \f | |
4159 | /* Output a library call to function FUN (a SYMBOL_REF rtx) | |
4160 | (emitting the queue unless NO_QUEUE is nonzero), | |
4161 | for a value of mode OUTMODE, | |
4162 | with NARGS different arguments, passed as alternating rtx values | |
4163 | and machine_modes to convert them to. | |
4164 | The rtx values should have been passed through protect_from_queue already. | |
4165 | ||
1258ee80 JJ |
4166 | FN_TYPE should be LCT_NORMAL for `normal' calls, LCT_CONST for `const' |
4167 | calls, LCT_PURE for `pure' calls, LCT_CONST_MAKE_BLOCK for `const' calls | |
4168 | which should be enclosed in REG_LIBCALL/REG_RETVAL notes, | |
4169 | LCT_PURE_MAKE_BLOCK for `purep' calls which should be enclosed in | |
4170 | REG_LIBCALL/REG_RETVAL notes with extra (use (memory (scratch)), | |
4171 | or other LCT_ value for other types of library calls. */ | |
de76b467 JH |
4172 | |
4173 | void | |
e34d07f2 KG |
4174 | emit_library_call (rtx orgfun, enum libcall_type fn_type, |
4175 | enum machine_mode outmode, int nargs, ...) | |
de76b467 | 4176 | { |
e34d07f2 KG |
4177 | va_list p; |
4178 | ||
4179 | va_start (p, nargs); | |
2a8f6b90 | 4180 | emit_library_call_value_1 (0, orgfun, NULL_RTX, fn_type, outmode, nargs, p); |
e34d07f2 | 4181 | va_end (p); |
de76b467 JH |
4182 | } |
4183 | \f | |
4184 | /* Like emit_library_call except that an extra argument, VALUE, | |
4185 | comes second and says where to store the result. | |
4186 | (If VALUE is zero, this function chooses a convenient way | |
4187 | to return the value. | |
4188 | ||
4189 | This function returns an rtx for where the value is to be found. | |
4190 | If VALUE is nonzero, VALUE is returned. */ | |
4191 | ||
4192 | rtx | |
e34d07f2 KG |
4193 | emit_library_call_value (rtx orgfun, rtx value, |
4194 | enum libcall_type fn_type, | |
4195 | enum machine_mode outmode, int nargs, ...) | |
de76b467 | 4196 | { |
6268b922 | 4197 | rtx result; |
e34d07f2 | 4198 | va_list p; |
6268b922 | 4199 | |
e34d07f2 | 4200 | va_start (p, nargs); |
6268b922 KG |
4201 | result = emit_library_call_value_1 (1, orgfun, value, fn_type, outmode, |
4202 | nargs, p); | |
e34d07f2 | 4203 | va_end (p); |
de76b467 | 4204 | |
6268b922 | 4205 | return result; |
322e3e34 RK |
4206 | } |
4207 | \f | |
51bbfa0c RS |
4208 | /* Store a single argument for a function call |
4209 | into the register or memory area where it must be passed. | |
4210 | *ARG describes the argument value and where to pass it. | |
4211 | ||
4212 | ARGBLOCK is the address of the stack-block for all the arguments, | |
d45cf215 | 4213 | or 0 on a machine where arguments are pushed individually. |
51bbfa0c RS |
4214 | |
4215 | MAY_BE_ALLOCA nonzero says this could be a call to `alloca' | |
f725a3ec | 4216 | so must be careful about how the stack is used. |
51bbfa0c RS |
4217 | |
4218 | VARIABLE_SIZE nonzero says that this was a variable-sized outgoing | |
4219 | argument stack. This is used if ACCUMULATE_OUTGOING_ARGS to indicate | |
4220 | that we need not worry about saving and restoring the stack. | |
4221 | ||
4c6b3b2a | 4222 | FNDECL is the declaration of the function we are calling. |
f725a3ec | 4223 | |
da7d8304 | 4224 | Return nonzero if this arg should cause sibcall failure, |
4c6b3b2a | 4225 | zero otherwise. */ |
51bbfa0c | 4226 | |
4c6b3b2a | 4227 | static int |
f725a3ec | 4228 | store_one_arg (arg, argblock, flags, variable_size, reg_parm_stack_space) |
51bbfa0c RS |
4229 | struct arg_data *arg; |
4230 | rtx argblock; | |
f8a097cd | 4231 | int flags; |
0f9b3ea6 | 4232 | int variable_size ATTRIBUTE_UNUSED; |
6f90e075 | 4233 | int reg_parm_stack_space; |
51bbfa0c | 4234 | { |
b3694847 | 4235 | tree pval = arg->tree_value; |
51bbfa0c RS |
4236 | rtx reg = 0; |
4237 | int partial = 0; | |
4238 | int used = 0; | |
6a651371 | 4239 | int i, lower_bound = 0, upper_bound = 0; |
4c6b3b2a | 4240 | int sibcall_failure = 0; |
51bbfa0c RS |
4241 | |
4242 | if (TREE_CODE (pval) == ERROR_MARK) | |
4c6b3b2a | 4243 | return 1; |
51bbfa0c | 4244 | |
cc79451b RK |
4245 | /* Push a new temporary level for any temporaries we make for |
4246 | this argument. */ | |
4247 | push_temp_slots (); | |
4248 | ||
f8a097cd | 4249 | if (ACCUMULATE_OUTGOING_ARGS && !(flags & ECF_SIBCALL)) |
51bbfa0c | 4250 | { |
f73ad30e JH |
4251 | /* If this is being stored into a pre-allocated, fixed-size, stack area, |
4252 | save any previous data at that location. */ | |
4253 | if (argblock && ! variable_size && arg->stack) | |
4254 | { | |
51bbfa0c | 4255 | #ifdef ARGS_GROW_DOWNWARD |
f73ad30e JH |
4256 | /* stack_slot is negative, but we want to index stack_usage_map |
4257 | with positive values. */ | |
4258 | if (GET_CODE (XEXP (arg->stack_slot, 0)) == PLUS) | |
4259 | upper_bound = -INTVAL (XEXP (XEXP (arg->stack_slot, 0), 1)) + 1; | |
4260 | else | |
4261 | upper_bound = 0; | |
51bbfa0c | 4262 | |
e7949876 | 4263 | lower_bound = upper_bound - arg->locate.size.constant; |
51bbfa0c | 4264 | #else |
f73ad30e JH |
4265 | if (GET_CODE (XEXP (arg->stack_slot, 0)) == PLUS) |
4266 | lower_bound = INTVAL (XEXP (XEXP (arg->stack_slot, 0), 1)); | |
4267 | else | |
4268 | lower_bound = 0; | |
51bbfa0c | 4269 | |
e7949876 | 4270 | upper_bound = lower_bound + arg->locate.size.constant; |
51bbfa0c RS |
4271 | #endif |
4272 | ||
546ff777 AM |
4273 | i = lower_bound; |
4274 | /* Don't worry about things in the fixed argument area; | |
4275 | it has already been saved. */ | |
4276 | if (i < reg_parm_stack_space) | |
4277 | i = reg_parm_stack_space; | |
4278 | while (i < upper_bound && stack_usage_map[i] == 0) | |
4279 | i++; | |
51bbfa0c | 4280 | |
546ff777 | 4281 | if (i < upper_bound) |
51bbfa0c | 4282 | { |
e7949876 AM |
4283 | /* We need to make a save area. */ |
4284 | unsigned int size = arg->locate.size.constant * BITS_PER_UNIT; | |
4285 | enum machine_mode save_mode = mode_for_size (size, MODE_INT, 1); | |
4286 | rtx adr = memory_address (save_mode, XEXP (arg->stack_slot, 0)); | |
4287 | rtx stack_area = gen_rtx_MEM (save_mode, adr); | |
f73ad30e JH |
4288 | |
4289 | if (save_mode == BLKmode) | |
4290 | { | |
1da68f56 RK |
4291 | tree ot = TREE_TYPE (arg->tree_value); |
4292 | tree nt = build_qualified_type (ot, (TYPE_QUALS (ot) | |
4293 | | TYPE_QUAL_CONST)); | |
4294 | ||
4295 | arg->save_area = assign_temp (nt, 0, 1, 1); | |
f73ad30e JH |
4296 | preserve_temp_slots (arg->save_area); |
4297 | emit_block_move (validize_mem (arg->save_area), stack_area, | |
44bb111a RH |
4298 | expr_size (arg->tree_value), |
4299 | BLOCK_OP_CALL_PARM); | |
f73ad30e JH |
4300 | } |
4301 | else | |
4302 | { | |
4303 | arg->save_area = gen_reg_rtx (save_mode); | |
4304 | emit_move_insn (arg->save_area, stack_area); | |
4305 | } | |
51bbfa0c RS |
4306 | } |
4307 | } | |
4308 | } | |
b564df06 | 4309 | |
51bbfa0c RS |
4310 | /* If this isn't going to be placed on both the stack and in registers, |
4311 | set up the register and number of words. */ | |
4312 | if (! arg->pass_on_stack) | |
aa7634dd DM |
4313 | { |
4314 | if (flags & ECF_SIBCALL) | |
4315 | reg = arg->tail_call_reg; | |
4316 | else | |
4317 | reg = arg->reg; | |
4318 | partial = arg->partial; | |
4319 | } | |
51bbfa0c RS |
4320 | |
4321 | if (reg != 0 && partial == 0) | |
4322 | /* Being passed entirely in a register. We shouldn't be called in | |
6d2f8887 | 4323 | this case. */ |
51bbfa0c RS |
4324 | abort (); |
4325 | ||
4ab56118 RK |
4326 | /* If this arg needs special alignment, don't load the registers |
4327 | here. */ | |
4328 | if (arg->n_aligned_regs != 0) | |
4329 | reg = 0; | |
f725a3ec | 4330 | |
4ab56118 | 4331 | /* If this is being passed partially in a register, we can't evaluate |
51bbfa0c RS |
4332 | it directly into its stack slot. Otherwise, we can. */ |
4333 | if (arg->value == 0) | |
d64f5a78 | 4334 | { |
d64f5a78 RS |
4335 | /* stack_arg_under_construction is nonzero if a function argument is |
4336 | being evaluated directly into the outgoing argument list and | |
4337 | expand_call must take special action to preserve the argument list | |
4338 | if it is called recursively. | |
4339 | ||
4340 | For scalar function arguments stack_usage_map is sufficient to | |
4341 | determine which stack slots must be saved and restored. Scalar | |
4342 | arguments in general have pass_on_stack == 0. | |
4343 | ||
4344 | If this argument is initialized by a function which takes the | |
4345 | address of the argument (a C++ constructor or a C function | |
4346 | returning a BLKmode structure), then stack_usage_map is | |
4347 | insufficient and expand_call must push the stack around the | |
4348 | function call. Such arguments have pass_on_stack == 1. | |
4349 | ||
4350 | Note that it is always safe to set stack_arg_under_construction, | |
4351 | but this generates suboptimal code if set when not needed. */ | |
4352 | ||
4353 | if (arg->pass_on_stack) | |
4354 | stack_arg_under_construction++; | |
f73ad30e | 4355 | |
3a08477a RK |
4356 | arg->value = expand_expr (pval, |
4357 | (partial | |
4358 | || TYPE_MODE (TREE_TYPE (pval)) != arg->mode) | |
4359 | ? NULL_RTX : arg->stack, | |
8403445a | 4360 | VOIDmode, EXPAND_STACK_PARM); |
1efe6448 RK |
4361 | |
4362 | /* If we are promoting object (or for any other reason) the mode | |
4363 | doesn't agree, convert the mode. */ | |
4364 | ||
7373d92d RK |
4365 | if (arg->mode != TYPE_MODE (TREE_TYPE (pval))) |
4366 | arg->value = convert_modes (arg->mode, TYPE_MODE (TREE_TYPE (pval)), | |
4367 | arg->value, arg->unsignedp); | |
1efe6448 | 4368 | |
d64f5a78 RS |
4369 | if (arg->pass_on_stack) |
4370 | stack_arg_under_construction--; | |
d64f5a78 | 4371 | } |
51bbfa0c RS |
4372 | |
4373 | /* Don't allow anything left on stack from computation | |
4374 | of argument to alloca. */ | |
f8a097cd | 4375 | if (flags & ECF_MAY_BE_ALLOCA) |
51bbfa0c RS |
4376 | do_pending_stack_adjust (); |
4377 | ||
4378 | if (arg->value == arg->stack) | |
37a08a29 RK |
4379 | /* If the value is already in the stack slot, we are done. */ |
4380 | ; | |
1efe6448 | 4381 | else if (arg->mode != BLKmode) |
51bbfa0c | 4382 | { |
b3694847 | 4383 | int size; |
51bbfa0c RS |
4384 | |
4385 | /* Argument is a scalar, not entirely passed in registers. | |
4386 | (If part is passed in registers, arg->partial says how much | |
4387 | and emit_push_insn will take care of putting it there.) | |
f725a3ec | 4388 | |
51bbfa0c RS |
4389 | Push it, and if its size is less than the |
4390 | amount of space allocated to it, | |
4391 | also bump stack pointer by the additional space. | |
4392 | Note that in C the default argument promotions | |
4393 | will prevent such mismatches. */ | |
4394 | ||
1efe6448 | 4395 | size = GET_MODE_SIZE (arg->mode); |
51bbfa0c RS |
4396 | /* Compute how much space the push instruction will push. |
4397 | On many machines, pushing a byte will advance the stack | |
4398 | pointer by a halfword. */ | |
4399 | #ifdef PUSH_ROUNDING | |
4400 | size = PUSH_ROUNDING (size); | |
4401 | #endif | |
4402 | used = size; | |
4403 | ||
4404 | /* Compute how much space the argument should get: | |
4405 | round up to a multiple of the alignment for arguments. */ | |
1efe6448 | 4406 | if (none != FUNCTION_ARG_PADDING (arg->mode, TREE_TYPE (pval))) |
51bbfa0c RS |
4407 | used = (((size + PARM_BOUNDARY / BITS_PER_UNIT - 1) |
4408 | / (PARM_BOUNDARY / BITS_PER_UNIT)) | |
4409 | * (PARM_BOUNDARY / BITS_PER_UNIT)); | |
4410 | ||
4411 | /* This isn't already where we want it on the stack, so put it there. | |
4412 | This can either be done with push or copy insns. */ | |
44bb111a RH |
4413 | emit_push_insn (arg->value, arg->mode, TREE_TYPE (pval), NULL_RTX, |
4414 | PARM_BOUNDARY, partial, reg, used - size, argblock, | |
e7949876 AM |
4415 | ARGS_SIZE_RTX (arg->locate.offset), reg_parm_stack_space, |
4416 | ARGS_SIZE_RTX (arg->locate.alignment_pad)); | |
841404cd AO |
4417 | |
4418 | /* Unless this is a partially-in-register argument, the argument is now | |
4419 | in the stack. */ | |
4420 | if (partial == 0) | |
4421 | arg->value = arg->stack; | |
51bbfa0c RS |
4422 | } |
4423 | else | |
4424 | { | |
4425 | /* BLKmode, at least partly to be pushed. */ | |
4426 | ||
1b1f20ca | 4427 | unsigned int parm_align; |
b3694847 | 4428 | int excess; |
51bbfa0c RS |
4429 | rtx size_rtx; |
4430 | ||
4431 | /* Pushing a nonscalar. | |
4432 | If part is passed in registers, PARTIAL says how much | |
4433 | and emit_push_insn will take care of putting it there. */ | |
4434 | ||
4435 | /* Round its size up to a multiple | |
4436 | of the allocation unit for arguments. */ | |
4437 | ||
e7949876 | 4438 | if (arg->locate.size.var != 0) |
51bbfa0c RS |
4439 | { |
4440 | excess = 0; | |
e7949876 | 4441 | size_rtx = ARGS_SIZE_RTX (arg->locate.size); |
51bbfa0c RS |
4442 | } |
4443 | else | |
4444 | { | |
51bbfa0c RS |
4445 | /* PUSH_ROUNDING has no effect on us, because |
4446 | emit_push_insn for BLKmode is careful to avoid it. */ | |
e7949876 AM |
4447 | excess = (arg->locate.size.constant |
4448 | - int_size_in_bytes (TREE_TYPE (pval)) | |
51bbfa0c | 4449 | + partial * UNITS_PER_WORD); |
db4c55f6 JM |
4450 | size_rtx = expand_expr (size_in_bytes (TREE_TYPE (pval)), |
4451 | NULL_RTX, TYPE_MODE (sizetype), 0); | |
51bbfa0c RS |
4452 | } |
4453 | ||
1b1f20ca RH |
4454 | /* Some types will require stricter alignment, which will be |
4455 | provided for elsewhere in argument layout. */ | |
4456 | parm_align = MAX (PARM_BOUNDARY, TYPE_ALIGN (TREE_TYPE (pval))); | |
4457 | ||
4458 | /* When an argument is padded down, the block is aligned to | |
4459 | PARM_BOUNDARY, but the actual argument isn't. */ | |
4460 | if (FUNCTION_ARG_PADDING (arg->mode, TREE_TYPE (pval)) == downward) | |
4461 | { | |
e7949876 | 4462 | if (arg->locate.size.var) |
1b1f20ca RH |
4463 | parm_align = BITS_PER_UNIT; |
4464 | else if (excess) | |
4465 | { | |
97d05bfd | 4466 | unsigned int excess_align = (excess & -excess) * BITS_PER_UNIT; |
1b1f20ca RH |
4467 | parm_align = MIN (parm_align, excess_align); |
4468 | } | |
4469 | } | |
4470 | ||
4c6b3b2a JJ |
4471 | if ((flags & ECF_SIBCALL) && GET_CODE (arg->value) == MEM) |
4472 | { | |
4473 | /* emit_push_insn might not work properly if arg->value and | |
e7949876 | 4474 | argblock + arg->locate.offset areas overlap. */ |
4c6b3b2a JJ |
4475 | rtx x = arg->value; |
4476 | int i = 0; | |
4477 | ||
4478 | if (XEXP (x, 0) == current_function_internal_arg_pointer | |
4479 | || (GET_CODE (XEXP (x, 0)) == PLUS | |
4480 | && XEXP (XEXP (x, 0), 0) == | |
4481 | current_function_internal_arg_pointer | |
4482 | && GET_CODE (XEXP (XEXP (x, 0), 1)) == CONST_INT)) | |
4483 | { | |
4484 | if (XEXP (x, 0) != current_function_internal_arg_pointer) | |
4485 | i = INTVAL (XEXP (XEXP (x, 0), 1)); | |
4486 | ||
4487 | /* expand_call should ensure this */ | |
e7949876 | 4488 | if (arg->locate.offset.var || GET_CODE (size_rtx) != CONST_INT) |
4c6b3b2a JJ |
4489 | abort (); |
4490 | ||
e7949876 | 4491 | if (arg->locate.offset.constant > i) |
4c6b3b2a | 4492 | { |
e7949876 | 4493 | if (arg->locate.offset.constant < i + INTVAL (size_rtx)) |
4c6b3b2a JJ |
4494 | sibcall_failure = 1; |
4495 | } | |
e7949876 | 4496 | else if (arg->locate.offset.constant < i) |
4c6b3b2a | 4497 | { |
e7949876 | 4498 | if (i < arg->locate.offset.constant + INTVAL (size_rtx)) |
4c6b3b2a JJ |
4499 | sibcall_failure = 1; |
4500 | } | |
4501 | } | |
4502 | } | |
4503 | ||
1efe6448 | 4504 | emit_push_insn (arg->value, arg->mode, TREE_TYPE (pval), size_rtx, |
1b1f20ca | 4505 | parm_align, partial, reg, excess, argblock, |
e7949876 AM |
4506 | ARGS_SIZE_RTX (arg->locate.offset), reg_parm_stack_space, |
4507 | ARGS_SIZE_RTX (arg->locate.alignment_pad)); | |
51bbfa0c | 4508 | |
841404cd AO |
4509 | /* Unless this is a partially-in-register argument, the argument is now |
4510 | in the stack. | |
51bbfa0c | 4511 | |
841404cd AO |
4512 | ??? Unlike the case above, in which we want the actual |
4513 | address of the data, so that we can load it directly into a | |
4514 | register, here we want the address of the stack slot, so that | |
4515 | it's properly aligned for word-by-word copying or something | |
4516 | like that. It's not clear that this is always correct. */ | |
4517 | if (partial == 0) | |
4518 | arg->value = arg->stack_slot; | |
4519 | } | |
51bbfa0c | 4520 | |
8403445a AM |
4521 | /* Mark all slots this store used. */ |
4522 | if (ACCUMULATE_OUTGOING_ARGS && !(flags & ECF_SIBCALL) | |
4523 | && argblock && ! variable_size && arg->stack) | |
4524 | for (i = lower_bound; i < upper_bound; i++) | |
4525 | stack_usage_map[i] = 1; | |
4526 | ||
51bbfa0c RS |
4527 | /* Once we have pushed something, pops can't safely |
4528 | be deferred during the rest of the arguments. */ | |
4529 | NO_DEFER_POP; | |
4530 | ||
4531 | /* ANSI doesn't require a sequence point here, | |
4532 | but PCC has one, so this will avoid some problems. */ | |
4533 | emit_queue (); | |
4534 | ||
db907e7b RK |
4535 | /* Free any temporary slots made in processing this argument. Show |
4536 | that we might have taken the address of something and pushed that | |
4537 | as an operand. */ | |
4538 | preserve_temp_slots (NULL_RTX); | |
51bbfa0c | 4539 | free_temp_slots (); |
cc79451b | 4540 | pop_temp_slots (); |
4c6b3b2a JJ |
4541 | |
4542 | return sibcall_failure; | |
51bbfa0c | 4543 | } |
a4b1b92a | 4544 | |
a4b1b92a RH |
4545 | /* Nonzero if we do not know how to pass TYPE solely in registers. |
4546 | We cannot do so in the following cases: | |
4547 | ||
4548 | - if the type has variable size | |
4549 | - if the type is marked as addressable (it is required to be constructed | |
4550 | into the stack) | |
4551 | - if the padding and mode of the type is such that a copy into a register | |
4552 | would put it into the wrong part of the register. | |
4553 | ||
4554 | Which padding can't be supported depends on the byte endianness. | |
4555 | ||
4556 | A value in a register is implicitly padded at the most significant end. | |
4557 | On a big-endian machine, that is the lower end in memory. | |
4558 | So a value padded in memory at the upper end can't go in a register. | |
4559 | For a little-endian machine, the reverse is true. */ | |
4560 | ||
4561 | bool | |
4562 | default_must_pass_in_stack (mode, type) | |
4563 | enum machine_mode mode; | |
4564 | tree type; | |
4565 | { | |
4566 | if (!type) | |
40cdfd5a | 4567 | return false; |
a4b1b92a RH |
4568 | |
4569 | /* If the type has variable size... */ | |
4570 | if (TREE_CODE (TYPE_SIZE (type)) != INTEGER_CST) | |
4571 | return true; | |
4572 | ||
4573 | /* If the type is marked as addressable (it is required | |
4574 | to be constructed into the stack)... */ | |
4575 | if (TREE_ADDRESSABLE (type)) | |
4576 | return true; | |
4577 | ||
4578 | /* If the padding and mode of the type is such that a copy into | |
4579 | a register would put it into the wrong part of the register. */ | |
4580 | if (mode == BLKmode | |
4581 | && int_size_in_bytes (type) % (PARM_BOUNDARY / BITS_PER_UNIT) | |
4582 | && (FUNCTION_ARG_PADDING (mode, type) | |
4583 | == (BYTES_BIG_ENDIAN ? upward : downward))) | |
4584 | return true; | |
4585 | ||
4586 | return false; | |
4587 | } |