Mercurial > hg > CbC > CbC_gcc
comparison gcc/calls.c @ 0:a06113de4d67
first commit
author | kent <kent@cr.ie.u-ryukyu.ac.jp> |
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date | Fri, 17 Jul 2009 14:47:48 +0900 |
parents | |
children | caeb520cebed 855418dad1a3 |
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1 /* Convert function calls to rtl insns, for GNU C compiler. | |
2 Copyright (C) 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998, | |
3 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 | |
4 Free Software Foundation, Inc. | |
5 | |
6 This file is part of GCC. | |
7 | |
8 GCC is free software; you can redistribute it and/or modify it under | |
9 the terms of the GNU General Public License as published by the Free | |
10 Software Foundation; either version 3, or (at your option) any later | |
11 version. | |
12 | |
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY | |
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
16 for more details. | |
17 | |
18 You should have received a copy of the GNU General Public License | |
19 along with GCC; see the file COPYING3. If not see | |
20 <http://www.gnu.org/licenses/>. */ | |
21 | |
22 #include "config.h" | |
23 #include "system.h" | |
24 #include "coretypes.h" | |
25 #include "tm.h" | |
26 #include "rtl.h" | |
27 #include "tree.h" | |
28 #include "gimple.h" | |
29 #include "flags.h" | |
30 #include "expr.h" | |
31 #include "optabs.h" | |
32 #include "libfuncs.h" | |
33 #include "function.h" | |
34 #include "regs.h" | |
35 #include "toplev.h" | |
36 #include "output.h" | |
37 #include "tm_p.h" | |
38 #include "timevar.h" | |
39 #include "sbitmap.h" | |
40 #include "langhooks.h" | |
41 #include "target.h" | |
42 #include "cgraph.h" | |
43 #include "except.h" | |
44 #include "dbgcnt.h" | |
45 #include "tree-flow.h" | |
46 | |
47 /* Like PREFERRED_STACK_BOUNDARY but in units of bytes, not bits. */ | |
48 #define STACK_BYTES (PREFERRED_STACK_BOUNDARY / BITS_PER_UNIT) | |
49 | |
50 /* Data structure and subroutines used within expand_call. */ | |
51 | |
52 struct arg_data | |
53 { | |
54 /* Tree node for this argument. */ | |
55 tree tree_value; | |
56 /* Mode for value; TYPE_MODE unless promoted. */ | |
57 enum machine_mode mode; | |
58 /* Current RTL value for argument, or 0 if it isn't precomputed. */ | |
59 rtx value; | |
60 /* Initially-compute RTL value for argument; only for const functions. */ | |
61 rtx initial_value; | |
62 /* Register to pass this argument in, 0 if passed on stack, or an | |
63 PARALLEL if the arg is to be copied into multiple non-contiguous | |
64 registers. */ | |
65 rtx reg; | |
66 /* Register to pass this argument in when generating tail call sequence. | |
67 This is not the same register as for normal calls on machines with | |
68 register windows. */ | |
69 rtx tail_call_reg; | |
70 /* If REG is a PARALLEL, this is a copy of VALUE pulled into the correct | |
71 form for emit_group_move. */ | |
72 rtx parallel_value; | |
73 /* If REG was promoted from the actual mode of the argument expression, | |
74 indicates whether the promotion is sign- or zero-extended. */ | |
75 int unsignedp; | |
76 /* Number of bytes to put in registers. 0 means put the whole arg | |
77 in registers. Also 0 if not passed in registers. */ | |
78 int partial; | |
79 /* Nonzero if argument must be passed on stack. | |
80 Note that some arguments may be passed on the stack | |
81 even though pass_on_stack is zero, just because FUNCTION_ARG says so. | |
82 pass_on_stack identifies arguments that *cannot* go in registers. */ | |
83 int pass_on_stack; | |
84 /* Some fields packaged up for locate_and_pad_parm. */ | |
85 struct locate_and_pad_arg_data locate; | |
86 /* Location on the stack at which parameter should be stored. The store | |
87 has already been done if STACK == VALUE. */ | |
88 rtx stack; | |
89 /* Location on the stack of the start of this argument slot. This can | |
90 differ from STACK if this arg pads downward. This location is known | |
91 to be aligned to FUNCTION_ARG_BOUNDARY. */ | |
92 rtx stack_slot; | |
93 /* Place that this stack area has been saved, if needed. */ | |
94 rtx save_area; | |
95 /* If an argument's alignment does not permit direct copying into registers, | |
96 copy in smaller-sized pieces into pseudos. These are stored in a | |
97 block pointed to by this field. The next field says how many | |
98 word-sized pseudos we made. */ | |
99 rtx *aligned_regs; | |
100 int n_aligned_regs; | |
101 }; | |
102 | |
103 /* A vector of one char per byte of stack space. A byte if nonzero if | |
104 the corresponding stack location has been used. | |
105 This vector is used to prevent a function call within an argument from | |
106 clobbering any stack already set up. */ | |
107 static char *stack_usage_map; | |
108 | |
109 /* Size of STACK_USAGE_MAP. */ | |
110 static int highest_outgoing_arg_in_use; | |
111 | |
112 /* A bitmap of virtual-incoming stack space. Bit is set if the corresponding | |
113 stack location's tail call argument has been already stored into the stack. | |
114 This bitmap is used to prevent sibling call optimization if function tries | |
115 to use parent's incoming argument slots when they have been already | |
116 overwritten with tail call arguments. */ | |
117 static sbitmap stored_args_map; | |
118 | |
119 /* stack_arg_under_construction is nonzero when an argument may be | |
120 initialized with a constructor call (including a C function that | |
121 returns a BLKmode struct) and expand_call must take special action | |
122 to make sure the object being constructed does not overlap the | |
123 argument list for the constructor call. */ | |
124 static int stack_arg_under_construction; | |
125 | |
126 static void emit_call_1 (rtx, tree, tree, tree, HOST_WIDE_INT, HOST_WIDE_INT, | |
127 HOST_WIDE_INT, rtx, rtx, int, rtx, int, | |
128 CUMULATIVE_ARGS *); | |
129 static void precompute_register_parameters (int, struct arg_data *, int *); | |
130 static int store_one_arg (struct arg_data *, rtx, int, int, int); | |
131 static void store_unaligned_arguments_into_pseudos (struct arg_data *, int); | |
132 static int finalize_must_preallocate (int, int, struct arg_data *, | |
133 struct args_size *); | |
134 static void precompute_arguments (int, struct arg_data *); | |
135 static int compute_argument_block_size (int, struct args_size *, tree, tree, int); | |
136 static void initialize_argument_information (int, struct arg_data *, | |
137 struct args_size *, int, | |
138 tree, tree, | |
139 tree, tree, CUMULATIVE_ARGS *, int, | |
140 rtx *, int *, int *, int *, | |
141 bool *, bool); | |
142 static void compute_argument_addresses (struct arg_data *, rtx, int); | |
143 static rtx rtx_for_function_call (tree, tree); | |
144 static void load_register_parameters (struct arg_data *, int, rtx *, int, | |
145 int, int *); | |
146 static rtx emit_library_call_value_1 (int, rtx, rtx, enum libcall_type, | |
147 enum machine_mode, int, va_list); | |
148 static int special_function_p (const_tree, int); | |
149 static int check_sibcall_argument_overlap_1 (rtx); | |
150 static int check_sibcall_argument_overlap (rtx, struct arg_data *, int); | |
151 | |
152 static int combine_pending_stack_adjustment_and_call (int, struct args_size *, | |
153 unsigned int); | |
154 static tree split_complex_types (tree); | |
155 | |
156 #ifdef REG_PARM_STACK_SPACE | |
157 static rtx save_fixed_argument_area (int, rtx, int *, int *); | |
158 static void restore_fixed_argument_area (rtx, rtx, int, int); | |
159 #endif | |
160 | |
161 /* Force FUNEXP into a form suitable for the address of a CALL, | |
162 and return that as an rtx. Also load the static chain register | |
163 if FNDECL is a nested function. | |
164 | |
165 CALL_FUSAGE points to a variable holding the prospective | |
166 CALL_INSN_FUNCTION_USAGE information. */ | |
167 | |
168 rtx | |
169 prepare_call_address (rtx funexp, rtx static_chain_value, | |
170 rtx *call_fusage, int reg_parm_seen, int sibcallp) | |
171 { | |
172 /* Make a valid memory address and copy constants through pseudo-regs, | |
173 but not for a constant address if -fno-function-cse. */ | |
174 if (GET_CODE (funexp) != SYMBOL_REF) | |
175 /* If we are using registers for parameters, force the | |
176 function address into a register now. */ | |
177 funexp = ((SMALL_REGISTER_CLASSES && reg_parm_seen) | |
178 ? force_not_mem (memory_address (FUNCTION_MODE, funexp)) | |
179 : memory_address (FUNCTION_MODE, funexp)); | |
180 else if (! sibcallp) | |
181 { | |
182 #ifndef NO_FUNCTION_CSE | |
183 if (optimize && ! flag_no_function_cse) | |
184 funexp = force_reg (Pmode, funexp); | |
185 #endif | |
186 } | |
187 | |
188 if (static_chain_value != 0) | |
189 { | |
190 static_chain_value = convert_memory_address (Pmode, static_chain_value); | |
191 emit_move_insn (static_chain_rtx, static_chain_value); | |
192 | |
193 if (REG_P (static_chain_rtx)) | |
194 use_reg (call_fusage, static_chain_rtx); | |
195 } | |
196 | |
197 return funexp; | |
198 } | |
199 | |
200 /* Generate instructions to call function FUNEXP, | |
201 and optionally pop the results. | |
202 The CALL_INSN is the first insn generated. | |
203 | |
204 FNDECL is the declaration node of the function. This is given to the | |
205 macro RETURN_POPS_ARGS to determine whether this function pops its own args. | |
206 | |
207 FUNTYPE is the data type of the function. This is given to the macro | |
208 RETURN_POPS_ARGS to determine whether this function pops its own args. | |
209 We used to allow an identifier for library functions, but that doesn't | |
210 work when the return type is an aggregate type and the calling convention | |
211 says that the pointer to this aggregate is to be popped by the callee. | |
212 | |
213 STACK_SIZE is the number of bytes of arguments on the stack, | |
214 ROUNDED_STACK_SIZE is that number rounded up to | |
215 PREFERRED_STACK_BOUNDARY; zero if the size is variable. This is | |
216 both to put into the call insn and to generate explicit popping | |
217 code if necessary. | |
218 | |
219 STRUCT_VALUE_SIZE is the number of bytes wanted in a structure value. | |
220 It is zero if this call doesn't want a structure value. | |
221 | |
222 NEXT_ARG_REG is the rtx that results from executing | |
223 FUNCTION_ARG (args_so_far, VOIDmode, void_type_node, 1) | |
224 just after all the args have had their registers assigned. | |
225 This could be whatever you like, but normally it is the first | |
226 arg-register beyond those used for args in this call, | |
227 or 0 if all the arg-registers are used in this call. | |
228 It is passed on to `gen_call' so you can put this info in the call insn. | |
229 | |
230 VALREG is a hard register in which a value is returned, | |
231 or 0 if the call does not return a value. | |
232 | |
233 OLD_INHIBIT_DEFER_POP is the value that `inhibit_defer_pop' had before | |
234 the args to this call were processed. | |
235 We restore `inhibit_defer_pop' to that value. | |
236 | |
237 CALL_FUSAGE is either empty or an EXPR_LIST of USE expressions that | |
238 denote registers used by the called function. */ | |
239 | |
240 static void | |
241 emit_call_1 (rtx funexp, tree fntree, tree fndecl ATTRIBUTE_UNUSED, | |
242 tree funtype ATTRIBUTE_UNUSED, | |
243 HOST_WIDE_INT stack_size ATTRIBUTE_UNUSED, | |
244 HOST_WIDE_INT rounded_stack_size, | |
245 HOST_WIDE_INT struct_value_size ATTRIBUTE_UNUSED, | |
246 rtx next_arg_reg ATTRIBUTE_UNUSED, rtx valreg, | |
247 int old_inhibit_defer_pop, rtx call_fusage, int ecf_flags, | |
248 CUMULATIVE_ARGS *args_so_far ATTRIBUTE_UNUSED) | |
249 { | |
250 rtx rounded_stack_size_rtx = GEN_INT (rounded_stack_size); | |
251 rtx call_insn; | |
252 int already_popped = 0; | |
253 HOST_WIDE_INT n_popped = RETURN_POPS_ARGS (fndecl, funtype, stack_size); | |
254 #if defined (HAVE_call) && defined (HAVE_call_value) | |
255 rtx struct_value_size_rtx; | |
256 struct_value_size_rtx = GEN_INT (struct_value_size); | |
257 #endif | |
258 | |
259 #ifdef CALL_POPS_ARGS | |
260 n_popped += CALL_POPS_ARGS (* args_so_far); | |
261 #endif | |
262 | |
263 /* Ensure address is valid. SYMBOL_REF is already valid, so no need, | |
264 and we don't want to load it into a register as an optimization, | |
265 because prepare_call_address already did it if it should be done. */ | |
266 if (GET_CODE (funexp) != SYMBOL_REF) | |
267 funexp = memory_address (FUNCTION_MODE, funexp); | |
268 | |
269 #if defined (HAVE_sibcall_pop) && defined (HAVE_sibcall_value_pop) | |
270 if ((ecf_flags & ECF_SIBCALL) | |
271 && HAVE_sibcall_pop && HAVE_sibcall_value_pop | |
272 && (n_popped > 0 || stack_size == 0)) | |
273 { | |
274 rtx n_pop = GEN_INT (n_popped); | |
275 rtx pat; | |
276 | |
277 /* If this subroutine pops its own args, record that in the call insn | |
278 if possible, for the sake of frame pointer elimination. */ | |
279 | |
280 if (valreg) | |
281 pat = GEN_SIBCALL_VALUE_POP (valreg, | |
282 gen_rtx_MEM (FUNCTION_MODE, funexp), | |
283 rounded_stack_size_rtx, next_arg_reg, | |
284 n_pop); | |
285 else | |
286 pat = GEN_SIBCALL_POP (gen_rtx_MEM (FUNCTION_MODE, funexp), | |
287 rounded_stack_size_rtx, next_arg_reg, n_pop); | |
288 | |
289 emit_call_insn (pat); | |
290 already_popped = 1; | |
291 } | |
292 else | |
293 #endif | |
294 | |
295 #if defined (HAVE_call_pop) && defined (HAVE_call_value_pop) | |
296 /* If the target has "call" or "call_value" insns, then prefer them | |
297 if no arguments are actually popped. If the target does not have | |
298 "call" or "call_value" insns, then we must use the popping versions | |
299 even if the call has no arguments to pop. */ | |
300 #if defined (HAVE_call) && defined (HAVE_call_value) | |
301 if (HAVE_call && HAVE_call_value && HAVE_call_pop && HAVE_call_value_pop | |
302 && n_popped > 0) | |
303 #else | |
304 if (HAVE_call_pop && HAVE_call_value_pop) | |
305 #endif | |
306 { | |
307 rtx n_pop = GEN_INT (n_popped); | |
308 rtx pat; | |
309 | |
310 /* If this subroutine pops its own args, record that in the call insn | |
311 if possible, for the sake of frame pointer elimination. */ | |
312 | |
313 if (valreg) | |
314 pat = GEN_CALL_VALUE_POP (valreg, | |
315 gen_rtx_MEM (FUNCTION_MODE, funexp), | |
316 rounded_stack_size_rtx, next_arg_reg, n_pop); | |
317 else | |
318 pat = GEN_CALL_POP (gen_rtx_MEM (FUNCTION_MODE, funexp), | |
319 rounded_stack_size_rtx, next_arg_reg, n_pop); | |
320 | |
321 emit_call_insn (pat); | |
322 already_popped = 1; | |
323 } | |
324 else | |
325 #endif | |
326 | |
327 #if defined (HAVE_sibcall) && defined (HAVE_sibcall_value) | |
328 if ((ecf_flags & ECF_SIBCALL) | |
329 && HAVE_sibcall && HAVE_sibcall_value) | |
330 { | |
331 if (valreg) | |
332 emit_call_insn (GEN_SIBCALL_VALUE (valreg, | |
333 gen_rtx_MEM (FUNCTION_MODE, funexp), | |
334 rounded_stack_size_rtx, | |
335 next_arg_reg, NULL_RTX)); | |
336 else | |
337 emit_call_insn (GEN_SIBCALL (gen_rtx_MEM (FUNCTION_MODE, funexp), | |
338 rounded_stack_size_rtx, next_arg_reg, | |
339 struct_value_size_rtx)); | |
340 } | |
341 else | |
342 #endif | |
343 | |
344 #if defined (HAVE_call) && defined (HAVE_call_value) | |
345 if (HAVE_call && HAVE_call_value) | |
346 { | |
347 if (valreg) | |
348 emit_call_insn (GEN_CALL_VALUE (valreg, | |
349 gen_rtx_MEM (FUNCTION_MODE, funexp), | |
350 rounded_stack_size_rtx, next_arg_reg, | |
351 NULL_RTX)); | |
352 else | |
353 emit_call_insn (GEN_CALL (gen_rtx_MEM (FUNCTION_MODE, funexp), | |
354 rounded_stack_size_rtx, next_arg_reg, | |
355 struct_value_size_rtx)); | |
356 } | |
357 else | |
358 #endif | |
359 gcc_unreachable (); | |
360 | |
361 /* Find the call we just emitted. */ | |
362 call_insn = last_call_insn (); | |
363 | |
364 /* Put the register usage information there. */ | |
365 add_function_usage_to (call_insn, call_fusage); | |
366 | |
367 /* If this is a const call, then set the insn's unchanging bit. */ | |
368 if (ecf_flags & ECF_CONST) | |
369 RTL_CONST_CALL_P (call_insn) = 1; | |
370 | |
371 /* If this is a pure call, then set the insn's unchanging bit. */ | |
372 if (ecf_flags & ECF_PURE) | |
373 RTL_PURE_CALL_P (call_insn) = 1; | |
374 | |
375 /* If this is a const call, then set the insn's unchanging bit. */ | |
376 if (ecf_flags & ECF_LOOPING_CONST_OR_PURE) | |
377 RTL_LOOPING_CONST_OR_PURE_CALL_P (call_insn) = 1; | |
378 | |
379 /* If this call can't throw, attach a REG_EH_REGION reg note to that | |
380 effect. */ | |
381 if (ecf_flags & ECF_NOTHROW) | |
382 add_reg_note (call_insn, REG_EH_REGION, const0_rtx); | |
383 else | |
384 { | |
385 int rn = lookup_expr_eh_region (fntree); | |
386 | |
387 /* If rn < 0, then either (1) tree-ssa not used or (2) doesn't | |
388 throw, which we already took care of. */ | |
389 if (rn > 0) | |
390 add_reg_note (call_insn, REG_EH_REGION, GEN_INT (rn)); | |
391 } | |
392 | |
393 if (ecf_flags & ECF_NORETURN) | |
394 add_reg_note (call_insn, REG_NORETURN, const0_rtx); | |
395 | |
396 if (ecf_flags & ECF_RETURNS_TWICE) | |
397 { | |
398 add_reg_note (call_insn, REG_SETJMP, const0_rtx); | |
399 cfun->calls_setjmp = 1; | |
400 } | |
401 | |
402 SIBLING_CALL_P (call_insn) = ((ecf_flags & ECF_SIBCALL) != 0); | |
403 | |
404 /* Restore this now, so that we do defer pops for this call's args | |
405 if the context of the call as a whole permits. */ | |
406 inhibit_defer_pop = old_inhibit_defer_pop; | |
407 | |
408 if (n_popped > 0) | |
409 { | |
410 if (!already_popped) | |
411 CALL_INSN_FUNCTION_USAGE (call_insn) | |
412 = gen_rtx_EXPR_LIST (VOIDmode, | |
413 gen_rtx_CLOBBER (VOIDmode, stack_pointer_rtx), | |
414 CALL_INSN_FUNCTION_USAGE (call_insn)); | |
415 rounded_stack_size -= n_popped; | |
416 rounded_stack_size_rtx = GEN_INT (rounded_stack_size); | |
417 stack_pointer_delta -= n_popped; | |
418 | |
419 /* If popup is needed, stack realign must use DRAP */ | |
420 if (SUPPORTS_STACK_ALIGNMENT) | |
421 crtl->need_drap = true; | |
422 } | |
423 | |
424 if (!ACCUMULATE_OUTGOING_ARGS) | |
425 { | |
426 /* If returning from the subroutine does not automatically pop the args, | |
427 we need an instruction to pop them sooner or later. | |
428 Perhaps do it now; perhaps just record how much space to pop later. | |
429 | |
430 If returning from the subroutine does pop the args, indicate that the | |
431 stack pointer will be changed. */ | |
432 | |
433 if (rounded_stack_size != 0) | |
434 { | |
435 if (ecf_flags & ECF_NORETURN) | |
436 /* Just pretend we did the pop. */ | |
437 stack_pointer_delta -= rounded_stack_size; | |
438 else if (flag_defer_pop && inhibit_defer_pop == 0 | |
439 && ! (ecf_flags & (ECF_CONST | ECF_PURE))) | |
440 pending_stack_adjust += rounded_stack_size; | |
441 else | |
442 adjust_stack (rounded_stack_size_rtx); | |
443 } | |
444 } | |
445 /* When we accumulate outgoing args, we must avoid any stack manipulations. | |
446 Restore the stack pointer to its original value now. Usually | |
447 ACCUMULATE_OUTGOING_ARGS targets don't get here, but there are exceptions. | |
448 On i386 ACCUMULATE_OUTGOING_ARGS can be enabled on demand, and | |
449 popping variants of functions exist as well. | |
450 | |
451 ??? We may optimize similar to defer_pop above, but it is | |
452 probably not worthwhile. | |
453 | |
454 ??? It will be worthwhile to enable combine_stack_adjustments even for | |
455 such machines. */ | |
456 else if (n_popped) | |
457 anti_adjust_stack (GEN_INT (n_popped)); | |
458 } | |
459 | |
460 /* Determine if the function identified by NAME and FNDECL is one with | |
461 special properties we wish to know about. | |
462 | |
463 For example, if the function might return more than one time (setjmp), then | |
464 set RETURNS_TWICE to a nonzero value. | |
465 | |
466 Similarly set NORETURN if the function is in the longjmp family. | |
467 | |
468 Set MAY_BE_ALLOCA for any memory allocation function that might allocate | |
469 space from the stack such as alloca. */ | |
470 | |
471 static int | |
472 special_function_p (const_tree fndecl, int flags) | |
473 { | |
474 if (fndecl && DECL_NAME (fndecl) | |
475 && IDENTIFIER_LENGTH (DECL_NAME (fndecl)) <= 17 | |
476 /* Exclude functions not at the file scope, or not `extern', | |
477 since they are not the magic functions we would otherwise | |
478 think they are. | |
479 FIXME: this should be handled with attributes, not with this | |
480 hacky imitation of DECL_ASSEMBLER_NAME. It's (also) wrong | |
481 because you can declare fork() inside a function if you | |
482 wish. */ | |
483 && (DECL_CONTEXT (fndecl) == NULL_TREE | |
484 || TREE_CODE (DECL_CONTEXT (fndecl)) == TRANSLATION_UNIT_DECL) | |
485 && TREE_PUBLIC (fndecl)) | |
486 { | |
487 const char *name = IDENTIFIER_POINTER (DECL_NAME (fndecl)); | |
488 const char *tname = name; | |
489 | |
490 /* We assume that alloca will always be called by name. It | |
491 makes no sense to pass it as a pointer-to-function to | |
492 anything that does not understand its behavior. */ | |
493 if (((IDENTIFIER_LENGTH (DECL_NAME (fndecl)) == 6 | |
494 && name[0] == 'a' | |
495 && ! strcmp (name, "alloca")) | |
496 || (IDENTIFIER_LENGTH (DECL_NAME (fndecl)) == 16 | |
497 && name[0] == '_' | |
498 && ! strcmp (name, "__builtin_alloca")))) | |
499 flags |= ECF_MAY_BE_ALLOCA; | |
500 | |
501 /* Disregard prefix _, __, __x or __builtin_. */ | |
502 if (name[0] == '_') | |
503 { | |
504 if (name[1] == '_' | |
505 && name[2] == 'b' | |
506 && !strncmp (name + 3, "uiltin_", 7)) | |
507 tname += 10; | |
508 else if (name[1] == '_' && name[2] == 'x') | |
509 tname += 3; | |
510 else if (name[1] == '_') | |
511 tname += 2; | |
512 else | |
513 tname += 1; | |
514 } | |
515 | |
516 if (tname[0] == 's') | |
517 { | |
518 if ((tname[1] == 'e' | |
519 && (! strcmp (tname, "setjmp") | |
520 || ! strcmp (tname, "setjmp_syscall"))) | |
521 || (tname[1] == 'i' | |
522 && ! strcmp (tname, "sigsetjmp")) | |
523 || (tname[1] == 'a' | |
524 && ! strcmp (tname, "savectx"))) | |
525 flags |= ECF_RETURNS_TWICE; | |
526 | |
527 if (tname[1] == 'i' | |
528 && ! strcmp (tname, "siglongjmp")) | |
529 flags |= ECF_NORETURN; | |
530 } | |
531 else if ((tname[0] == 'q' && tname[1] == 's' | |
532 && ! strcmp (tname, "qsetjmp")) | |
533 || (tname[0] == 'v' && tname[1] == 'f' | |
534 && ! strcmp (tname, "vfork")) | |
535 || (tname[0] == 'g' && tname[1] == 'e' | |
536 && !strcmp (tname, "getcontext"))) | |
537 flags |= ECF_RETURNS_TWICE; | |
538 | |
539 else if (tname[0] == 'l' && tname[1] == 'o' | |
540 && ! strcmp (tname, "longjmp")) | |
541 flags |= ECF_NORETURN; | |
542 } | |
543 | |
544 return flags; | |
545 } | |
546 | |
547 /* Return nonzero when FNDECL represents a call to setjmp. */ | |
548 | |
549 int | |
550 setjmp_call_p (const_tree fndecl) | |
551 { | |
552 return special_function_p (fndecl, 0) & ECF_RETURNS_TWICE; | |
553 } | |
554 | |
555 | |
556 /* Return true if STMT is an alloca call. */ | |
557 | |
558 bool | |
559 gimple_alloca_call_p (const_gimple stmt) | |
560 { | |
561 tree fndecl; | |
562 | |
563 if (!is_gimple_call (stmt)) | |
564 return false; | |
565 | |
566 fndecl = gimple_call_fndecl (stmt); | |
567 if (fndecl && (special_function_p (fndecl, 0) & ECF_MAY_BE_ALLOCA)) | |
568 return true; | |
569 | |
570 return false; | |
571 } | |
572 | |
573 /* Return true when exp contains alloca call. */ | |
574 | |
575 bool | |
576 alloca_call_p (const_tree exp) | |
577 { | |
578 if (TREE_CODE (exp) == CALL_EXPR | |
579 && TREE_CODE (CALL_EXPR_FN (exp)) == ADDR_EXPR | |
580 && (TREE_CODE (TREE_OPERAND (CALL_EXPR_FN (exp), 0)) == FUNCTION_DECL) | |
581 && (special_function_p (TREE_OPERAND (CALL_EXPR_FN (exp), 0), 0) | |
582 & ECF_MAY_BE_ALLOCA)) | |
583 return true; | |
584 return false; | |
585 } | |
586 | |
587 /* Detect flags (function attributes) from the function decl or type node. */ | |
588 | |
589 int | |
590 flags_from_decl_or_type (const_tree exp) | |
591 { | |
592 int flags = 0; | |
593 const_tree type = exp; | |
594 | |
595 if (DECL_P (exp)) | |
596 { | |
597 type = TREE_TYPE (exp); | |
598 | |
599 /* The function exp may have the `malloc' attribute. */ | |
600 if (DECL_IS_MALLOC (exp)) | |
601 flags |= ECF_MALLOC; | |
602 | |
603 /* The function exp may have the `returns_twice' attribute. */ | |
604 if (DECL_IS_RETURNS_TWICE (exp)) | |
605 flags |= ECF_RETURNS_TWICE; | |
606 | |
607 /* Process the pure and const attributes. */ | |
608 if (TREE_READONLY (exp) && ! TREE_THIS_VOLATILE (exp)) | |
609 flags |= ECF_CONST; | |
610 if (DECL_PURE_P (exp)) | |
611 flags |= ECF_PURE; | |
612 if (DECL_LOOPING_CONST_OR_PURE_P (exp)) | |
613 flags |= ECF_LOOPING_CONST_OR_PURE; | |
614 | |
615 if (DECL_IS_NOVOPS (exp)) | |
616 flags |= ECF_NOVOPS; | |
617 | |
618 if (TREE_NOTHROW (exp)) | |
619 flags |= ECF_NOTHROW; | |
620 | |
621 flags = special_function_p (exp, flags); | |
622 } | |
623 else if (TYPE_P (exp) && TYPE_READONLY (exp) && ! TREE_THIS_VOLATILE (exp)) | |
624 flags |= ECF_CONST; | |
625 | |
626 if (TREE_THIS_VOLATILE (exp)) | |
627 flags |= ECF_NORETURN; | |
628 | |
629 return flags; | |
630 } | |
631 | |
632 /* Detect flags from a CALL_EXPR. */ | |
633 | |
634 int | |
635 call_expr_flags (const_tree t) | |
636 { | |
637 int flags; | |
638 tree decl = get_callee_fndecl (t); | |
639 | |
640 if (decl) | |
641 flags = flags_from_decl_or_type (decl); | |
642 else | |
643 { | |
644 t = TREE_TYPE (CALL_EXPR_FN (t)); | |
645 if (t && TREE_CODE (t) == POINTER_TYPE) | |
646 flags = flags_from_decl_or_type (TREE_TYPE (t)); | |
647 else | |
648 flags = 0; | |
649 } | |
650 | |
651 return flags; | |
652 } | |
653 | |
654 /* Precompute all register parameters as described by ARGS, storing values | |
655 into fields within the ARGS array. | |
656 | |
657 NUM_ACTUALS indicates the total number elements in the ARGS array. | |
658 | |
659 Set REG_PARM_SEEN if we encounter a register parameter. */ | |
660 | |
661 static void | |
662 precompute_register_parameters (int num_actuals, struct arg_data *args, | |
663 int *reg_parm_seen) | |
664 { | |
665 int i; | |
666 | |
667 *reg_parm_seen = 0; | |
668 | |
669 for (i = 0; i < num_actuals; i++) | |
670 if (args[i].reg != 0 && ! args[i].pass_on_stack) | |
671 { | |
672 *reg_parm_seen = 1; | |
673 | |
674 if (args[i].value == 0) | |
675 { | |
676 push_temp_slots (); | |
677 args[i].value = expand_normal (args[i].tree_value); | |
678 preserve_temp_slots (args[i].value); | |
679 pop_temp_slots (); | |
680 } | |
681 | |
682 /* If the value is a non-legitimate constant, force it into a | |
683 pseudo now. TLS symbols sometimes need a call to resolve. */ | |
684 if (CONSTANT_P (args[i].value) | |
685 && !LEGITIMATE_CONSTANT_P (args[i].value)) | |
686 args[i].value = force_reg (args[i].mode, args[i].value); | |
687 | |
688 /* If we are to promote the function arg to a wider mode, | |
689 do it now. */ | |
690 | |
691 if (args[i].mode != TYPE_MODE (TREE_TYPE (args[i].tree_value))) | |
692 args[i].value | |
693 = convert_modes (args[i].mode, | |
694 TYPE_MODE (TREE_TYPE (args[i].tree_value)), | |
695 args[i].value, args[i].unsignedp); | |
696 | |
697 /* If we're going to have to load the value by parts, pull the | |
698 parts into pseudos. The part extraction process can involve | |
699 non-trivial computation. */ | |
700 if (GET_CODE (args[i].reg) == PARALLEL) | |
701 { | |
702 tree type = TREE_TYPE (args[i].tree_value); | |
703 args[i].parallel_value | |
704 = emit_group_load_into_temps (args[i].reg, args[i].value, | |
705 type, int_size_in_bytes (type)); | |
706 } | |
707 | |
708 /* If the value is expensive, and we are inside an appropriately | |
709 short loop, put the value into a pseudo and then put the pseudo | |
710 into the hard reg. | |
711 | |
712 For small register classes, also do this if this call uses | |
713 register parameters. This is to avoid reload conflicts while | |
714 loading the parameters registers. */ | |
715 | |
716 else if ((! (REG_P (args[i].value) | |
717 || (GET_CODE (args[i].value) == SUBREG | |
718 && REG_P (SUBREG_REG (args[i].value))))) | |
719 && args[i].mode != BLKmode | |
720 && rtx_cost (args[i].value, SET, optimize_insn_for_speed_p ()) | |
721 > COSTS_N_INSNS (1) | |
722 && ((SMALL_REGISTER_CLASSES && *reg_parm_seen) | |
723 || optimize)) | |
724 args[i].value = copy_to_mode_reg (args[i].mode, args[i].value); | |
725 } | |
726 } | |
727 | |
728 #ifdef REG_PARM_STACK_SPACE | |
729 | |
730 /* The argument list is the property of the called routine and it | |
731 may clobber it. If the fixed area has been used for previous | |
732 parameters, we must save and restore it. */ | |
733 | |
734 static rtx | |
735 save_fixed_argument_area (int reg_parm_stack_space, rtx argblock, int *low_to_save, int *high_to_save) | |
736 { | |
737 int low; | |
738 int high; | |
739 | |
740 /* Compute the boundary of the area that needs to be saved, if any. */ | |
741 high = reg_parm_stack_space; | |
742 #ifdef ARGS_GROW_DOWNWARD | |
743 high += 1; | |
744 #endif | |
745 if (high > highest_outgoing_arg_in_use) | |
746 high = highest_outgoing_arg_in_use; | |
747 | |
748 for (low = 0; low < high; low++) | |
749 if (stack_usage_map[low] != 0) | |
750 { | |
751 int num_to_save; | |
752 enum machine_mode save_mode; | |
753 int delta; | |
754 rtx stack_area; | |
755 rtx save_area; | |
756 | |
757 while (stack_usage_map[--high] == 0) | |
758 ; | |
759 | |
760 *low_to_save = low; | |
761 *high_to_save = high; | |
762 | |
763 num_to_save = high - low + 1; | |
764 save_mode = mode_for_size (num_to_save * BITS_PER_UNIT, MODE_INT, 1); | |
765 | |
766 /* If we don't have the required alignment, must do this | |
767 in BLKmode. */ | |
768 if ((low & (MIN (GET_MODE_SIZE (save_mode), | |
769 BIGGEST_ALIGNMENT / UNITS_PER_WORD) - 1))) | |
770 save_mode = BLKmode; | |
771 | |
772 #ifdef ARGS_GROW_DOWNWARD | |
773 delta = -high; | |
774 #else | |
775 delta = low; | |
776 #endif | |
777 stack_area = gen_rtx_MEM (save_mode, | |
778 memory_address (save_mode, | |
779 plus_constant (argblock, | |
780 delta))); | |
781 | |
782 set_mem_align (stack_area, PARM_BOUNDARY); | |
783 if (save_mode == BLKmode) | |
784 { | |
785 save_area = assign_stack_temp (BLKmode, num_to_save, 0); | |
786 emit_block_move (validize_mem (save_area), stack_area, | |
787 GEN_INT (num_to_save), BLOCK_OP_CALL_PARM); | |
788 } | |
789 else | |
790 { | |
791 save_area = gen_reg_rtx (save_mode); | |
792 emit_move_insn (save_area, stack_area); | |
793 } | |
794 | |
795 return save_area; | |
796 } | |
797 | |
798 return NULL_RTX; | |
799 } | |
800 | |
801 static void | |
802 restore_fixed_argument_area (rtx save_area, rtx argblock, int high_to_save, int low_to_save) | |
803 { | |
804 enum machine_mode save_mode = GET_MODE (save_area); | |
805 int delta; | |
806 rtx stack_area; | |
807 | |
808 #ifdef ARGS_GROW_DOWNWARD | |
809 delta = -high_to_save; | |
810 #else | |
811 delta = low_to_save; | |
812 #endif | |
813 stack_area = gen_rtx_MEM (save_mode, | |
814 memory_address (save_mode, | |
815 plus_constant (argblock, delta))); | |
816 set_mem_align (stack_area, PARM_BOUNDARY); | |
817 | |
818 if (save_mode != BLKmode) | |
819 emit_move_insn (stack_area, save_area); | |
820 else | |
821 emit_block_move (stack_area, validize_mem (save_area), | |
822 GEN_INT (high_to_save - low_to_save + 1), | |
823 BLOCK_OP_CALL_PARM); | |
824 } | |
825 #endif /* REG_PARM_STACK_SPACE */ | |
826 | |
827 /* If any elements in ARGS refer to parameters that are to be passed in | |
828 registers, but not in memory, and whose alignment does not permit a | |
829 direct copy into registers. Copy the values into a group of pseudos | |
830 which we will later copy into the appropriate hard registers. | |
831 | |
832 Pseudos for each unaligned argument will be stored into the array | |
833 args[argnum].aligned_regs. The caller is responsible for deallocating | |
834 the aligned_regs array if it is nonzero. */ | |
835 | |
836 static void | |
837 store_unaligned_arguments_into_pseudos (struct arg_data *args, int num_actuals) | |
838 { | |
839 int i, j; | |
840 | |
841 for (i = 0; i < num_actuals; i++) | |
842 if (args[i].reg != 0 && ! args[i].pass_on_stack | |
843 && args[i].mode == BLKmode | |
844 && MEM_P (args[i].value) | |
845 && (MEM_ALIGN (args[i].value) | |
846 < (unsigned int) MIN (BIGGEST_ALIGNMENT, BITS_PER_WORD))) | |
847 { | |
848 int bytes = int_size_in_bytes (TREE_TYPE (args[i].tree_value)); | |
849 int endian_correction = 0; | |
850 | |
851 if (args[i].partial) | |
852 { | |
853 gcc_assert (args[i].partial % UNITS_PER_WORD == 0); | |
854 args[i].n_aligned_regs = args[i].partial / UNITS_PER_WORD; | |
855 } | |
856 else | |
857 { | |
858 args[i].n_aligned_regs | |
859 = (bytes + UNITS_PER_WORD - 1) / UNITS_PER_WORD; | |
860 } | |
861 | |
862 args[i].aligned_regs = XNEWVEC (rtx, args[i].n_aligned_regs); | |
863 | |
864 /* Structures smaller than a word are normally aligned to the | |
865 least significant byte. On a BYTES_BIG_ENDIAN machine, | |
866 this means we must skip the empty high order bytes when | |
867 calculating the bit offset. */ | |
868 if (bytes < UNITS_PER_WORD | |
869 #ifdef BLOCK_REG_PADDING | |
870 && (BLOCK_REG_PADDING (args[i].mode, | |
871 TREE_TYPE (args[i].tree_value), 1) | |
872 == downward) | |
873 #else | |
874 && BYTES_BIG_ENDIAN | |
875 #endif | |
876 ) | |
877 endian_correction = BITS_PER_WORD - bytes * BITS_PER_UNIT; | |
878 | |
879 for (j = 0; j < args[i].n_aligned_regs; j++) | |
880 { | |
881 rtx reg = gen_reg_rtx (word_mode); | |
882 rtx word = operand_subword_force (args[i].value, j, BLKmode); | |
883 int bitsize = MIN (bytes * BITS_PER_UNIT, BITS_PER_WORD); | |
884 | |
885 args[i].aligned_regs[j] = reg; | |
886 word = extract_bit_field (word, bitsize, 0, 1, NULL_RTX, | |
887 word_mode, word_mode); | |
888 | |
889 /* There is no need to restrict this code to loading items | |
890 in TYPE_ALIGN sized hunks. The bitfield instructions can | |
891 load up entire word sized registers efficiently. | |
892 | |
893 ??? This may not be needed anymore. | |
894 We use to emit a clobber here but that doesn't let later | |
895 passes optimize the instructions we emit. By storing 0 into | |
896 the register later passes know the first AND to zero out the | |
897 bitfield being set in the register is unnecessary. The store | |
898 of 0 will be deleted as will at least the first AND. */ | |
899 | |
900 emit_move_insn (reg, const0_rtx); | |
901 | |
902 bytes -= bitsize / BITS_PER_UNIT; | |
903 store_bit_field (reg, bitsize, endian_correction, word_mode, | |
904 word); | |
905 } | |
906 } | |
907 } | |
908 | |
909 /* Fill in ARGS_SIZE and ARGS array based on the parameters found in | |
910 CALL_EXPR EXP. | |
911 | |
912 NUM_ACTUALS is the total number of parameters. | |
913 | |
914 N_NAMED_ARGS is the total number of named arguments. | |
915 | |
916 STRUCT_VALUE_ADDR_VALUE is the implicit argument for a struct return | |
917 value, or null. | |
918 | |
919 FNDECL is the tree code for the target of this call (if known) | |
920 | |
921 ARGS_SO_FAR holds state needed by the target to know where to place | |
922 the next argument. | |
923 | |
924 REG_PARM_STACK_SPACE is the number of bytes of stack space reserved | |
925 for arguments which are passed in registers. | |
926 | |
927 OLD_STACK_LEVEL is a pointer to an rtx which olds the old stack level | |
928 and may be modified by this routine. | |
929 | |
930 OLD_PENDING_ADJ, MUST_PREALLOCATE and FLAGS are pointers to integer | |
931 flags which may may be modified by this routine. | |
932 | |
933 MAY_TAILCALL is cleared if we encounter an invisible pass-by-reference | |
934 that requires allocation of stack space. | |
935 | |
936 CALL_FROM_THUNK_P is true if this call is the jump from a thunk to | |
937 the thunked-to function. */ | |
938 | |
939 static void | |
940 initialize_argument_information (int num_actuals ATTRIBUTE_UNUSED, | |
941 struct arg_data *args, | |
942 struct args_size *args_size, | |
943 int n_named_args ATTRIBUTE_UNUSED, | |
944 tree exp, tree struct_value_addr_value, | |
945 tree fndecl, tree fntype, | |
946 CUMULATIVE_ARGS *args_so_far, | |
947 int reg_parm_stack_space, | |
948 rtx *old_stack_level, int *old_pending_adj, | |
949 int *must_preallocate, int *ecf_flags, | |
950 bool *may_tailcall, bool call_from_thunk_p) | |
951 { | |
952 /* 1 if scanning parms front to back, -1 if scanning back to front. */ | |
953 int inc; | |
954 | |
955 /* Count arg position in order args appear. */ | |
956 int argpos; | |
957 | |
958 int i; | |
959 | |
960 args_size->constant = 0; | |
961 args_size->var = 0; | |
962 | |
963 /* In this loop, we consider args in the order they are written. | |
964 We fill up ARGS from the front or from the back if necessary | |
965 so that in any case the first arg to be pushed ends up at the front. */ | |
966 | |
967 if (PUSH_ARGS_REVERSED) | |
968 { | |
969 i = num_actuals - 1, inc = -1; | |
970 /* In this case, must reverse order of args | |
971 so that we compute and push the last arg first. */ | |
972 } | |
973 else | |
974 { | |
975 i = 0, inc = 1; | |
976 } | |
977 | |
978 /* First fill in the actual arguments in the ARGS array, splitting | |
979 complex arguments if necessary. */ | |
980 { | |
981 int j = i; | |
982 call_expr_arg_iterator iter; | |
983 tree arg; | |
984 | |
985 if (struct_value_addr_value) | |
986 { | |
987 args[j].tree_value = struct_value_addr_value; | |
988 j += inc; | |
989 } | |
990 FOR_EACH_CALL_EXPR_ARG (arg, iter, exp) | |
991 { | |
992 tree argtype = TREE_TYPE (arg); | |
993 if (targetm.calls.split_complex_arg | |
994 && argtype | |
995 && TREE_CODE (argtype) == COMPLEX_TYPE | |
996 && targetm.calls.split_complex_arg (argtype)) | |
997 { | |
998 tree subtype = TREE_TYPE (argtype); | |
999 args[j].tree_value = build1 (REALPART_EXPR, subtype, arg); | |
1000 j += inc; | |
1001 args[j].tree_value = build1 (IMAGPART_EXPR, subtype, arg); | |
1002 } | |
1003 else | |
1004 args[j].tree_value = arg; | |
1005 j += inc; | |
1006 } | |
1007 } | |
1008 | |
1009 /* I counts args in order (to be) pushed; ARGPOS counts in order written. */ | |
1010 for (argpos = 0; argpos < num_actuals; i += inc, argpos++) | |
1011 { | |
1012 tree type = TREE_TYPE (args[i].tree_value); | |
1013 int unsignedp; | |
1014 enum machine_mode mode; | |
1015 | |
1016 /* Replace erroneous argument with constant zero. */ | |
1017 if (type == error_mark_node || !COMPLETE_TYPE_P (type)) | |
1018 args[i].tree_value = integer_zero_node, type = integer_type_node; | |
1019 | |
1020 /* If TYPE is a transparent union, pass things the way we would | |
1021 pass the first field of the union. We have already verified that | |
1022 the modes are the same. */ | |
1023 if (TREE_CODE (type) == UNION_TYPE && TYPE_TRANSPARENT_UNION (type)) | |
1024 type = TREE_TYPE (TYPE_FIELDS (type)); | |
1025 | |
1026 /* Decide where to pass this arg. | |
1027 | |
1028 args[i].reg is nonzero if all or part is passed in registers. | |
1029 | |
1030 args[i].partial is nonzero if part but not all is passed in registers, | |
1031 and the exact value says how many bytes are passed in registers. | |
1032 | |
1033 args[i].pass_on_stack is nonzero if the argument must at least be | |
1034 computed on the stack. It may then be loaded back into registers | |
1035 if args[i].reg is nonzero. | |
1036 | |
1037 These decisions are driven by the FUNCTION_... macros and must agree | |
1038 with those made by function.c. */ | |
1039 | |
1040 /* See if this argument should be passed by invisible reference. */ | |
1041 if (pass_by_reference (args_so_far, TYPE_MODE (type), | |
1042 type, argpos < n_named_args)) | |
1043 { | |
1044 bool callee_copies; | |
1045 tree base; | |
1046 | |
1047 callee_copies | |
1048 = reference_callee_copied (args_so_far, TYPE_MODE (type), | |
1049 type, argpos < n_named_args); | |
1050 | |
1051 /* If we're compiling a thunk, pass through invisible references | |
1052 instead of making a copy. */ | |
1053 if (call_from_thunk_p | |
1054 || (callee_copies | |
1055 && !TREE_ADDRESSABLE (type) | |
1056 && (base = get_base_address (args[i].tree_value)) | |
1057 && (!DECL_P (base) || MEM_P (DECL_RTL (base))))) | |
1058 { | |
1059 /* We can't use sibcalls if a callee-copied argument is | |
1060 stored in the current function's frame. */ | |
1061 if (!call_from_thunk_p && DECL_P (base) && !TREE_STATIC (base)) | |
1062 *may_tailcall = false; | |
1063 | |
1064 args[i].tree_value = build_fold_addr_expr (args[i].tree_value); | |
1065 type = TREE_TYPE (args[i].tree_value); | |
1066 | |
1067 if (*ecf_flags & ECF_CONST) | |
1068 *ecf_flags &= ~(ECF_CONST | ECF_LOOPING_CONST_OR_PURE); | |
1069 } | |
1070 else | |
1071 { | |
1072 /* We make a copy of the object and pass the address to the | |
1073 function being called. */ | |
1074 rtx copy; | |
1075 | |
1076 if (!COMPLETE_TYPE_P (type) | |
1077 || TREE_CODE (TYPE_SIZE_UNIT (type)) != INTEGER_CST | |
1078 || (flag_stack_check == GENERIC_STACK_CHECK | |
1079 && compare_tree_int (TYPE_SIZE_UNIT (type), | |
1080 STACK_CHECK_MAX_VAR_SIZE) > 0)) | |
1081 { | |
1082 /* This is a variable-sized object. Make space on the stack | |
1083 for it. */ | |
1084 rtx size_rtx = expr_size (args[i].tree_value); | |
1085 | |
1086 if (*old_stack_level == 0) | |
1087 { | |
1088 emit_stack_save (SAVE_BLOCK, old_stack_level, NULL_RTX); | |
1089 *old_pending_adj = pending_stack_adjust; | |
1090 pending_stack_adjust = 0; | |
1091 } | |
1092 | |
1093 copy = gen_rtx_MEM (BLKmode, | |
1094 allocate_dynamic_stack_space | |
1095 (size_rtx, NULL_RTX, TYPE_ALIGN (type))); | |
1096 set_mem_attributes (copy, type, 1); | |
1097 } | |
1098 else | |
1099 copy = assign_temp (type, 0, 1, 0); | |
1100 | |
1101 store_expr (args[i].tree_value, copy, 0, false); | |
1102 | |
1103 /* Just change the const function to pure and then let | |
1104 the next test clear the pure based on | |
1105 callee_copies. */ | |
1106 if (*ecf_flags & ECF_CONST) | |
1107 { | |
1108 *ecf_flags &= ~ECF_CONST; | |
1109 *ecf_flags |= ECF_PURE; | |
1110 } | |
1111 | |
1112 if (!callee_copies && *ecf_flags & ECF_PURE) | |
1113 *ecf_flags &= ~(ECF_PURE | ECF_LOOPING_CONST_OR_PURE); | |
1114 | |
1115 args[i].tree_value | |
1116 = build_fold_addr_expr (make_tree (type, copy)); | |
1117 type = TREE_TYPE (args[i].tree_value); | |
1118 *may_tailcall = false; | |
1119 } | |
1120 } | |
1121 | |
1122 mode = TYPE_MODE (type); | |
1123 unsignedp = TYPE_UNSIGNED (type); | |
1124 | |
1125 if (targetm.calls.promote_function_args (fndecl | |
1126 ? TREE_TYPE (fndecl) | |
1127 : fntype)) | |
1128 mode = promote_mode (type, mode, &unsignedp, 1); | |
1129 | |
1130 args[i].unsignedp = unsignedp; | |
1131 args[i].mode = mode; | |
1132 | |
1133 args[i].reg = FUNCTION_ARG (*args_so_far, mode, type, | |
1134 argpos < n_named_args); | |
1135 #ifdef FUNCTION_INCOMING_ARG | |
1136 /* If this is a sibling call and the machine has register windows, the | |
1137 register window has to be unwinded before calling the routine, so | |
1138 arguments have to go into the incoming registers. */ | |
1139 args[i].tail_call_reg = FUNCTION_INCOMING_ARG (*args_so_far, mode, type, | |
1140 argpos < n_named_args); | |
1141 #else | |
1142 args[i].tail_call_reg = args[i].reg; | |
1143 #endif | |
1144 | |
1145 if (args[i].reg) | |
1146 args[i].partial | |
1147 = targetm.calls.arg_partial_bytes (args_so_far, mode, type, | |
1148 argpos < n_named_args); | |
1149 | |
1150 args[i].pass_on_stack = targetm.calls.must_pass_in_stack (mode, type); | |
1151 | |
1152 /* If FUNCTION_ARG returned a (parallel [(expr_list (nil) ...) ...]), | |
1153 it means that we are to pass this arg in the register(s) designated | |
1154 by the PARALLEL, but also to pass it in the stack. */ | |
1155 if (args[i].reg && GET_CODE (args[i].reg) == PARALLEL | |
1156 && XEXP (XVECEXP (args[i].reg, 0, 0), 0) == 0) | |
1157 args[i].pass_on_stack = 1; | |
1158 | |
1159 /* If this is an addressable type, we must preallocate the stack | |
1160 since we must evaluate the object into its final location. | |
1161 | |
1162 If this is to be passed in both registers and the stack, it is simpler | |
1163 to preallocate. */ | |
1164 if (TREE_ADDRESSABLE (type) | |
1165 || (args[i].pass_on_stack && args[i].reg != 0)) | |
1166 *must_preallocate = 1; | |
1167 | |
1168 /* Compute the stack-size of this argument. */ | |
1169 if (args[i].reg == 0 || args[i].partial != 0 | |
1170 || reg_parm_stack_space > 0 | |
1171 || args[i].pass_on_stack) | |
1172 locate_and_pad_parm (mode, type, | |
1173 #ifdef STACK_PARMS_IN_REG_PARM_AREA | |
1174 1, | |
1175 #else | |
1176 args[i].reg != 0, | |
1177 #endif | |
1178 args[i].pass_on_stack ? 0 : args[i].partial, | |
1179 fndecl, args_size, &args[i].locate); | |
1180 #ifdef BLOCK_REG_PADDING | |
1181 else | |
1182 /* The argument is passed entirely in registers. See at which | |
1183 end it should be padded. */ | |
1184 args[i].locate.where_pad = | |
1185 BLOCK_REG_PADDING (mode, type, | |
1186 int_size_in_bytes (type) <= UNITS_PER_WORD); | |
1187 #endif | |
1188 | |
1189 /* Update ARGS_SIZE, the total stack space for args so far. */ | |
1190 | |
1191 args_size->constant += args[i].locate.size.constant; | |
1192 if (args[i].locate.size.var) | |
1193 ADD_PARM_SIZE (*args_size, args[i].locate.size.var); | |
1194 | |
1195 /* Increment ARGS_SO_FAR, which has info about which arg-registers | |
1196 have been used, etc. */ | |
1197 | |
1198 FUNCTION_ARG_ADVANCE (*args_so_far, TYPE_MODE (type), type, | |
1199 argpos < n_named_args); | |
1200 } | |
1201 } | |
1202 | |
1203 /* Update ARGS_SIZE to contain the total size for the argument block. | |
1204 Return the original constant component of the argument block's size. | |
1205 | |
1206 REG_PARM_STACK_SPACE holds the number of bytes of stack space reserved | |
1207 for arguments passed in registers. */ | |
1208 | |
1209 static int | |
1210 compute_argument_block_size (int reg_parm_stack_space, | |
1211 struct args_size *args_size, | |
1212 tree fndecl ATTRIBUTE_UNUSED, | |
1213 tree fntype ATTRIBUTE_UNUSED, | |
1214 int preferred_stack_boundary ATTRIBUTE_UNUSED) | |
1215 { | |
1216 int unadjusted_args_size = args_size->constant; | |
1217 | |
1218 /* For accumulate outgoing args mode we don't need to align, since the frame | |
1219 will be already aligned. Align to STACK_BOUNDARY in order to prevent | |
1220 backends from generating misaligned frame sizes. */ | |
1221 if (ACCUMULATE_OUTGOING_ARGS && preferred_stack_boundary > STACK_BOUNDARY) | |
1222 preferred_stack_boundary = STACK_BOUNDARY; | |
1223 | |
1224 /* Compute the actual size of the argument block required. The variable | |
1225 and constant sizes must be combined, the size may have to be rounded, | |
1226 and there may be a minimum required size. */ | |
1227 | |
1228 if (args_size->var) | |
1229 { | |
1230 args_size->var = ARGS_SIZE_TREE (*args_size); | |
1231 args_size->constant = 0; | |
1232 | |
1233 preferred_stack_boundary /= BITS_PER_UNIT; | |
1234 if (preferred_stack_boundary > 1) | |
1235 { | |
1236 /* We don't handle this case yet. To handle it correctly we have | |
1237 to add the delta, round and subtract the delta. | |
1238 Currently no machine description requires this support. */ | |
1239 gcc_assert (!(stack_pointer_delta & (preferred_stack_boundary - 1))); | |
1240 args_size->var = round_up (args_size->var, preferred_stack_boundary); | |
1241 } | |
1242 | |
1243 if (reg_parm_stack_space > 0) | |
1244 { | |
1245 args_size->var | |
1246 = size_binop (MAX_EXPR, args_size->var, | |
1247 ssize_int (reg_parm_stack_space)); | |
1248 | |
1249 /* The area corresponding to register parameters is not to count in | |
1250 the size of the block we need. So make the adjustment. */ | |
1251 if (! OUTGOING_REG_PARM_STACK_SPACE ((!fndecl ? fntype : TREE_TYPE (fndecl)))) | |
1252 args_size->var | |
1253 = size_binop (MINUS_EXPR, args_size->var, | |
1254 ssize_int (reg_parm_stack_space)); | |
1255 } | |
1256 } | |
1257 else | |
1258 { | |
1259 preferred_stack_boundary /= BITS_PER_UNIT; | |
1260 if (preferred_stack_boundary < 1) | |
1261 preferred_stack_boundary = 1; | |
1262 args_size->constant = (((args_size->constant | |
1263 + stack_pointer_delta | |
1264 + preferred_stack_boundary - 1) | |
1265 / preferred_stack_boundary | |
1266 * preferred_stack_boundary) | |
1267 - stack_pointer_delta); | |
1268 | |
1269 args_size->constant = MAX (args_size->constant, | |
1270 reg_parm_stack_space); | |
1271 | |
1272 if (! OUTGOING_REG_PARM_STACK_SPACE ((!fndecl ? fntype : TREE_TYPE (fndecl)))) | |
1273 args_size->constant -= reg_parm_stack_space; | |
1274 } | |
1275 return unadjusted_args_size; | |
1276 } | |
1277 | |
1278 /* Precompute parameters as needed for a function call. | |
1279 | |
1280 FLAGS is mask of ECF_* constants. | |
1281 | |
1282 NUM_ACTUALS is the number of arguments. | |
1283 | |
1284 ARGS is an array containing information for each argument; this | |
1285 routine fills in the INITIAL_VALUE and VALUE fields for each | |
1286 precomputed argument. */ | |
1287 | |
1288 static void | |
1289 precompute_arguments (int num_actuals, struct arg_data *args) | |
1290 { | |
1291 int i; | |
1292 | |
1293 /* If this is a libcall, then precompute all arguments so that we do not | |
1294 get extraneous instructions emitted as part of the libcall sequence. */ | |
1295 | |
1296 /* If we preallocated the stack space, and some arguments must be passed | |
1297 on the stack, then we must precompute any parameter which contains a | |
1298 function call which will store arguments on the stack. | |
1299 Otherwise, evaluating the parameter may clobber previous parameters | |
1300 which have already been stored into the stack. (we have code to avoid | |
1301 such case by saving the outgoing stack arguments, but it results in | |
1302 worse code) */ | |
1303 if (!ACCUMULATE_OUTGOING_ARGS) | |
1304 return; | |
1305 | |
1306 for (i = 0; i < num_actuals; i++) | |
1307 { | |
1308 enum machine_mode mode; | |
1309 | |
1310 if (TREE_CODE (args[i].tree_value) != CALL_EXPR) | |
1311 continue; | |
1312 | |
1313 /* If this is an addressable type, we cannot pre-evaluate it. */ | |
1314 gcc_assert (!TREE_ADDRESSABLE (TREE_TYPE (args[i].tree_value))); | |
1315 | |
1316 args[i].initial_value = args[i].value | |
1317 = expand_normal (args[i].tree_value); | |
1318 | |
1319 mode = TYPE_MODE (TREE_TYPE (args[i].tree_value)); | |
1320 if (mode != args[i].mode) | |
1321 { | |
1322 args[i].value | |
1323 = convert_modes (args[i].mode, mode, | |
1324 args[i].value, args[i].unsignedp); | |
1325 #if defined(PROMOTE_FUNCTION_MODE) && !defined(PROMOTE_MODE) | |
1326 /* CSE will replace this only if it contains args[i].value | |
1327 pseudo, so convert it down to the declared mode using | |
1328 a SUBREG. */ | |
1329 if (REG_P (args[i].value) | |
1330 && GET_MODE_CLASS (args[i].mode) == MODE_INT) | |
1331 { | |
1332 args[i].initial_value | |
1333 = gen_lowpart_SUBREG (mode, args[i].value); | |
1334 SUBREG_PROMOTED_VAR_P (args[i].initial_value) = 1; | |
1335 SUBREG_PROMOTED_UNSIGNED_SET (args[i].initial_value, | |
1336 args[i].unsignedp); | |
1337 } | |
1338 #endif | |
1339 } | |
1340 } | |
1341 } | |
1342 | |
1343 /* Given the current state of MUST_PREALLOCATE and information about | |
1344 arguments to a function call in NUM_ACTUALS, ARGS and ARGS_SIZE, | |
1345 compute and return the final value for MUST_PREALLOCATE. */ | |
1346 | |
1347 static int | |
1348 finalize_must_preallocate (int must_preallocate, int num_actuals, | |
1349 struct arg_data *args, struct args_size *args_size) | |
1350 { | |
1351 /* See if we have or want to preallocate stack space. | |
1352 | |
1353 If we would have to push a partially-in-regs parm | |
1354 before other stack parms, preallocate stack space instead. | |
1355 | |
1356 If the size of some parm is not a multiple of the required stack | |
1357 alignment, we must preallocate. | |
1358 | |
1359 If the total size of arguments that would otherwise create a copy in | |
1360 a temporary (such as a CALL) is more than half the total argument list | |
1361 size, preallocation is faster. | |
1362 | |
1363 Another reason to preallocate is if we have a machine (like the m88k) | |
1364 where stack alignment is required to be maintained between every | |
1365 pair of insns, not just when the call is made. However, we assume here | |
1366 that such machines either do not have push insns (and hence preallocation | |
1367 would occur anyway) or the problem is taken care of with | |
1368 PUSH_ROUNDING. */ | |
1369 | |
1370 if (! must_preallocate) | |
1371 { | |
1372 int partial_seen = 0; | |
1373 int copy_to_evaluate_size = 0; | |
1374 int i; | |
1375 | |
1376 for (i = 0; i < num_actuals && ! must_preallocate; i++) | |
1377 { | |
1378 if (args[i].partial > 0 && ! args[i].pass_on_stack) | |
1379 partial_seen = 1; | |
1380 else if (partial_seen && args[i].reg == 0) | |
1381 must_preallocate = 1; | |
1382 | |
1383 if (TYPE_MODE (TREE_TYPE (args[i].tree_value)) == BLKmode | |
1384 && (TREE_CODE (args[i].tree_value) == CALL_EXPR | |
1385 || TREE_CODE (args[i].tree_value) == TARGET_EXPR | |
1386 || TREE_CODE (args[i].tree_value) == COND_EXPR | |
1387 || TREE_ADDRESSABLE (TREE_TYPE (args[i].tree_value)))) | |
1388 copy_to_evaluate_size | |
1389 += int_size_in_bytes (TREE_TYPE (args[i].tree_value)); | |
1390 } | |
1391 | |
1392 if (copy_to_evaluate_size * 2 >= args_size->constant | |
1393 && args_size->constant > 0) | |
1394 must_preallocate = 1; | |
1395 } | |
1396 return must_preallocate; | |
1397 } | |
1398 | |
1399 /* If we preallocated stack space, compute the address of each argument | |
1400 and store it into the ARGS array. | |
1401 | |
1402 We need not ensure it is a valid memory address here; it will be | |
1403 validized when it is used. | |
1404 | |
1405 ARGBLOCK is an rtx for the address of the outgoing arguments. */ | |
1406 | |
1407 static void | |
1408 compute_argument_addresses (struct arg_data *args, rtx argblock, int num_actuals) | |
1409 { | |
1410 if (argblock) | |
1411 { | |
1412 rtx arg_reg = argblock; | |
1413 int i, arg_offset = 0; | |
1414 | |
1415 if (GET_CODE (argblock) == PLUS) | |
1416 arg_reg = XEXP (argblock, 0), arg_offset = INTVAL (XEXP (argblock, 1)); | |
1417 | |
1418 for (i = 0; i < num_actuals; i++) | |
1419 { | |
1420 rtx offset = ARGS_SIZE_RTX (args[i].locate.offset); | |
1421 rtx slot_offset = ARGS_SIZE_RTX (args[i].locate.slot_offset); | |
1422 rtx addr; | |
1423 unsigned int align, boundary; | |
1424 unsigned int units_on_stack = 0; | |
1425 enum machine_mode partial_mode = VOIDmode; | |
1426 | |
1427 /* Skip this parm if it will not be passed on the stack. */ | |
1428 if (! args[i].pass_on_stack | |
1429 && args[i].reg != 0 | |
1430 && args[i].partial == 0) | |
1431 continue; | |
1432 | |
1433 if (GET_CODE (offset) == CONST_INT) | |
1434 addr = plus_constant (arg_reg, INTVAL (offset)); | |
1435 else | |
1436 addr = gen_rtx_PLUS (Pmode, arg_reg, offset); | |
1437 | |
1438 addr = plus_constant (addr, arg_offset); | |
1439 | |
1440 if (args[i].partial != 0) | |
1441 { | |
1442 /* Only part of the parameter is being passed on the stack. | |
1443 Generate a simple memory reference of the correct size. */ | |
1444 units_on_stack = args[i].locate.size.constant; | |
1445 partial_mode = mode_for_size (units_on_stack * BITS_PER_UNIT, | |
1446 MODE_INT, 1); | |
1447 args[i].stack = gen_rtx_MEM (partial_mode, addr); | |
1448 set_mem_size (args[i].stack, GEN_INT (units_on_stack)); | |
1449 } | |
1450 else | |
1451 { | |
1452 args[i].stack = gen_rtx_MEM (args[i].mode, addr); | |
1453 set_mem_attributes (args[i].stack, | |
1454 TREE_TYPE (args[i].tree_value), 1); | |
1455 } | |
1456 align = BITS_PER_UNIT; | |
1457 boundary = args[i].locate.boundary; | |
1458 if (args[i].locate.where_pad != downward) | |
1459 align = boundary; | |
1460 else if (GET_CODE (offset) == CONST_INT) | |
1461 { | |
1462 align = INTVAL (offset) * BITS_PER_UNIT | boundary; | |
1463 align = align & -align; | |
1464 } | |
1465 set_mem_align (args[i].stack, align); | |
1466 | |
1467 if (GET_CODE (slot_offset) == CONST_INT) | |
1468 addr = plus_constant (arg_reg, INTVAL (slot_offset)); | |
1469 else | |
1470 addr = gen_rtx_PLUS (Pmode, arg_reg, slot_offset); | |
1471 | |
1472 addr = plus_constant (addr, arg_offset); | |
1473 | |
1474 if (args[i].partial != 0) | |
1475 { | |
1476 /* Only part of the parameter is being passed on the stack. | |
1477 Generate a simple memory reference of the correct size. | |
1478 */ | |
1479 args[i].stack_slot = gen_rtx_MEM (partial_mode, addr); | |
1480 set_mem_size (args[i].stack_slot, GEN_INT (units_on_stack)); | |
1481 } | |
1482 else | |
1483 { | |
1484 args[i].stack_slot = gen_rtx_MEM (args[i].mode, addr); | |
1485 set_mem_attributes (args[i].stack_slot, | |
1486 TREE_TYPE (args[i].tree_value), 1); | |
1487 } | |
1488 set_mem_align (args[i].stack_slot, args[i].locate.boundary); | |
1489 | |
1490 /* Function incoming arguments may overlap with sibling call | |
1491 outgoing arguments and we cannot allow reordering of reads | |
1492 from function arguments with stores to outgoing arguments | |
1493 of sibling calls. */ | |
1494 set_mem_alias_set (args[i].stack, 0); | |
1495 set_mem_alias_set (args[i].stack_slot, 0); | |
1496 } | |
1497 } | |
1498 } | |
1499 | |
1500 /* Given a FNDECL and EXP, return an rtx suitable for use as a target address | |
1501 in a call instruction. | |
1502 | |
1503 FNDECL is the tree node for the target function. For an indirect call | |
1504 FNDECL will be NULL_TREE. | |
1505 | |
1506 ADDR is the operand 0 of CALL_EXPR for this call. */ | |
1507 | |
1508 static rtx | |
1509 rtx_for_function_call (tree fndecl, tree addr) | |
1510 { | |
1511 rtx funexp; | |
1512 | |
1513 /* Get the function to call, in the form of RTL. */ | |
1514 if (fndecl) | |
1515 { | |
1516 /* If this is the first use of the function, see if we need to | |
1517 make an external definition for it. */ | |
1518 if (!TREE_USED (fndecl) && fndecl != current_function_decl) | |
1519 { | |
1520 assemble_external (fndecl); | |
1521 TREE_USED (fndecl) = 1; | |
1522 } | |
1523 | |
1524 /* Get a SYMBOL_REF rtx for the function address. */ | |
1525 funexp = XEXP (DECL_RTL (fndecl), 0); | |
1526 } | |
1527 else | |
1528 /* Generate an rtx (probably a pseudo-register) for the address. */ | |
1529 { | |
1530 push_temp_slots (); | |
1531 funexp = expand_normal (addr); | |
1532 pop_temp_slots (); /* FUNEXP can't be BLKmode. */ | |
1533 } | |
1534 return funexp; | |
1535 } | |
1536 | |
1537 /* Return true if and only if SIZE storage units (usually bytes) | |
1538 starting from address ADDR overlap with already clobbered argument | |
1539 area. This function is used to determine if we should give up a | |
1540 sibcall. */ | |
1541 | |
1542 static bool | |
1543 mem_overlaps_already_clobbered_arg_p (rtx addr, unsigned HOST_WIDE_INT size) | |
1544 { | |
1545 HOST_WIDE_INT i; | |
1546 | |
1547 if (addr == crtl->args.internal_arg_pointer) | |
1548 i = 0; | |
1549 else if (GET_CODE (addr) == PLUS | |
1550 && XEXP (addr, 0) == crtl->args.internal_arg_pointer | |
1551 && GET_CODE (XEXP (addr, 1)) == CONST_INT) | |
1552 i = INTVAL (XEXP (addr, 1)); | |
1553 /* Return true for arg pointer based indexed addressing. */ | |
1554 else if (GET_CODE (addr) == PLUS | |
1555 && (XEXP (addr, 0) == crtl->args.internal_arg_pointer | |
1556 || XEXP (addr, 1) == crtl->args.internal_arg_pointer)) | |
1557 return true; | |
1558 else | |
1559 return false; | |
1560 | |
1561 #ifdef ARGS_GROW_DOWNWARD | |
1562 i = -i - size; | |
1563 #endif | |
1564 if (size > 0) | |
1565 { | |
1566 unsigned HOST_WIDE_INT k; | |
1567 | |
1568 for (k = 0; k < size; k++) | |
1569 if (i + k < stored_args_map->n_bits | |
1570 && TEST_BIT (stored_args_map, i + k)) | |
1571 return true; | |
1572 } | |
1573 | |
1574 return false; | |
1575 } | |
1576 | |
1577 /* Do the register loads required for any wholly-register parms or any | |
1578 parms which are passed both on the stack and in a register. Their | |
1579 expressions were already evaluated. | |
1580 | |
1581 Mark all register-parms as living through the call, putting these USE | |
1582 insns in the CALL_INSN_FUNCTION_USAGE field. | |
1583 | |
1584 When IS_SIBCALL, perform the check_sibcall_argument_overlap | |
1585 checking, setting *SIBCALL_FAILURE if appropriate. */ | |
1586 | |
1587 static void | |
1588 load_register_parameters (struct arg_data *args, int num_actuals, | |
1589 rtx *call_fusage, int flags, int is_sibcall, | |
1590 int *sibcall_failure) | |
1591 { | |
1592 int i, j; | |
1593 | |
1594 for (i = 0; i < num_actuals; i++) | |
1595 { | |
1596 rtx reg = ((flags & ECF_SIBCALL) | |
1597 ? args[i].tail_call_reg : args[i].reg); | |
1598 if (reg) | |
1599 { | |
1600 int partial = args[i].partial; | |
1601 int nregs; | |
1602 int size = 0; | |
1603 rtx before_arg = get_last_insn (); | |
1604 /* Set non-negative if we must move a word at a time, even if | |
1605 just one word (e.g, partial == 4 && mode == DFmode). Set | |
1606 to -1 if we just use a normal move insn. This value can be | |
1607 zero if the argument is a zero size structure. */ | |
1608 nregs = -1; | |
1609 if (GET_CODE (reg) == PARALLEL) | |
1610 ; | |
1611 else if (partial) | |
1612 { | |
1613 gcc_assert (partial % UNITS_PER_WORD == 0); | |
1614 nregs = partial / UNITS_PER_WORD; | |
1615 } | |
1616 else if (TYPE_MODE (TREE_TYPE (args[i].tree_value)) == BLKmode) | |
1617 { | |
1618 size = int_size_in_bytes (TREE_TYPE (args[i].tree_value)); | |
1619 nregs = (size + (UNITS_PER_WORD - 1)) / UNITS_PER_WORD; | |
1620 } | |
1621 else | |
1622 size = GET_MODE_SIZE (args[i].mode); | |
1623 | |
1624 /* Handle calls that pass values in multiple non-contiguous | |
1625 locations. The Irix 6 ABI has examples of this. */ | |
1626 | |
1627 if (GET_CODE (reg) == PARALLEL) | |
1628 emit_group_move (reg, args[i].parallel_value); | |
1629 | |
1630 /* If simple case, just do move. If normal partial, store_one_arg | |
1631 has already loaded the register for us. In all other cases, | |
1632 load the register(s) from memory. */ | |
1633 | |
1634 else if (nregs == -1) | |
1635 { | |
1636 emit_move_insn (reg, args[i].value); | |
1637 #ifdef BLOCK_REG_PADDING | |
1638 /* Handle case where we have a value that needs shifting | |
1639 up to the msb. eg. a QImode value and we're padding | |
1640 upward on a BYTES_BIG_ENDIAN machine. */ | |
1641 if (size < UNITS_PER_WORD | |
1642 && (args[i].locate.where_pad | |
1643 == (BYTES_BIG_ENDIAN ? upward : downward))) | |
1644 { | |
1645 rtx x; | |
1646 int shift = (UNITS_PER_WORD - size) * BITS_PER_UNIT; | |
1647 | |
1648 /* Assigning REG here rather than a temp makes CALL_FUSAGE | |
1649 report the whole reg as used. Strictly speaking, the | |
1650 call only uses SIZE bytes at the msb end, but it doesn't | |
1651 seem worth generating rtl to say that. */ | |
1652 reg = gen_rtx_REG (word_mode, REGNO (reg)); | |
1653 x = expand_shift (LSHIFT_EXPR, word_mode, reg, | |
1654 build_int_cst (NULL_TREE, shift), | |
1655 reg, 1); | |
1656 if (x != reg) | |
1657 emit_move_insn (reg, x); | |
1658 } | |
1659 #endif | |
1660 } | |
1661 | |
1662 /* If we have pre-computed the values to put in the registers in | |
1663 the case of non-aligned structures, copy them in now. */ | |
1664 | |
1665 else if (args[i].n_aligned_regs != 0) | |
1666 for (j = 0; j < args[i].n_aligned_regs; j++) | |
1667 emit_move_insn (gen_rtx_REG (word_mode, REGNO (reg) + j), | |
1668 args[i].aligned_regs[j]); | |
1669 | |
1670 else if (partial == 0 || args[i].pass_on_stack) | |
1671 { | |
1672 rtx mem = validize_mem (args[i].value); | |
1673 | |
1674 /* Check for overlap with already clobbered argument area. */ | |
1675 if (is_sibcall | |
1676 && mem_overlaps_already_clobbered_arg_p (XEXP (args[i].value, 0), | |
1677 size)) | |
1678 *sibcall_failure = 1; | |
1679 | |
1680 /* Handle a BLKmode that needs shifting. */ | |
1681 if (nregs == 1 && size < UNITS_PER_WORD | |
1682 #ifdef BLOCK_REG_PADDING | |
1683 && args[i].locate.where_pad == downward | |
1684 #else | |
1685 && BYTES_BIG_ENDIAN | |
1686 #endif | |
1687 ) | |
1688 { | |
1689 rtx tem = operand_subword_force (mem, 0, args[i].mode); | |
1690 rtx ri = gen_rtx_REG (word_mode, REGNO (reg)); | |
1691 rtx x = gen_reg_rtx (word_mode); | |
1692 int shift = (UNITS_PER_WORD - size) * BITS_PER_UNIT; | |
1693 enum tree_code dir = BYTES_BIG_ENDIAN ? RSHIFT_EXPR | |
1694 : LSHIFT_EXPR; | |
1695 | |
1696 emit_move_insn (x, tem); | |
1697 x = expand_shift (dir, word_mode, x, | |
1698 build_int_cst (NULL_TREE, shift), | |
1699 ri, 1); | |
1700 if (x != ri) | |
1701 emit_move_insn (ri, x); | |
1702 } | |
1703 else | |
1704 move_block_to_reg (REGNO (reg), mem, nregs, args[i].mode); | |
1705 } | |
1706 | |
1707 /* When a parameter is a block, and perhaps in other cases, it is | |
1708 possible that it did a load from an argument slot that was | |
1709 already clobbered. */ | |
1710 if (is_sibcall | |
1711 && check_sibcall_argument_overlap (before_arg, &args[i], 0)) | |
1712 *sibcall_failure = 1; | |
1713 | |
1714 /* Handle calls that pass values in multiple non-contiguous | |
1715 locations. The Irix 6 ABI has examples of this. */ | |
1716 if (GET_CODE (reg) == PARALLEL) | |
1717 use_group_regs (call_fusage, reg); | |
1718 else if (nregs == -1) | |
1719 use_reg (call_fusage, reg); | |
1720 else if (nregs > 0) | |
1721 use_regs (call_fusage, REGNO (reg), nregs); | |
1722 } | |
1723 } | |
1724 } | |
1725 | |
1726 /* We need to pop PENDING_STACK_ADJUST bytes. But, if the arguments | |
1727 wouldn't fill up an even multiple of PREFERRED_UNIT_STACK_BOUNDARY | |
1728 bytes, then we would need to push some additional bytes to pad the | |
1729 arguments. So, we compute an adjust to the stack pointer for an | |
1730 amount that will leave the stack under-aligned by UNADJUSTED_ARGS_SIZE | |
1731 bytes. Then, when the arguments are pushed the stack will be perfectly | |
1732 aligned. ARGS_SIZE->CONSTANT is set to the number of bytes that should | |
1733 be popped after the call. Returns the adjustment. */ | |
1734 | |
1735 static int | |
1736 combine_pending_stack_adjustment_and_call (int unadjusted_args_size, | |
1737 struct args_size *args_size, | |
1738 unsigned int preferred_unit_stack_boundary) | |
1739 { | |
1740 /* The number of bytes to pop so that the stack will be | |
1741 under-aligned by UNADJUSTED_ARGS_SIZE bytes. */ | |
1742 HOST_WIDE_INT adjustment; | |
1743 /* The alignment of the stack after the arguments are pushed, if we | |
1744 just pushed the arguments without adjust the stack here. */ | |
1745 unsigned HOST_WIDE_INT unadjusted_alignment; | |
1746 | |
1747 unadjusted_alignment | |
1748 = ((stack_pointer_delta + unadjusted_args_size) | |
1749 % preferred_unit_stack_boundary); | |
1750 | |
1751 /* We want to get rid of as many of the PENDING_STACK_ADJUST bytes | |
1752 as possible -- leaving just enough left to cancel out the | |
1753 UNADJUSTED_ALIGNMENT. In other words, we want to ensure that the | |
1754 PENDING_STACK_ADJUST is non-negative, and congruent to | |
1755 -UNADJUSTED_ALIGNMENT modulo the PREFERRED_UNIT_STACK_BOUNDARY. */ | |
1756 | |
1757 /* Begin by trying to pop all the bytes. */ | |
1758 unadjusted_alignment | |
1759 = (unadjusted_alignment | |
1760 - (pending_stack_adjust % preferred_unit_stack_boundary)); | |
1761 adjustment = pending_stack_adjust; | |
1762 /* Push enough additional bytes that the stack will be aligned | |
1763 after the arguments are pushed. */ | |
1764 if (preferred_unit_stack_boundary > 1) | |
1765 { | |
1766 if (unadjusted_alignment > 0) | |
1767 adjustment -= preferred_unit_stack_boundary - unadjusted_alignment; | |
1768 else | |
1769 adjustment += unadjusted_alignment; | |
1770 } | |
1771 | |
1772 /* Now, sets ARGS_SIZE->CONSTANT so that we pop the right number of | |
1773 bytes after the call. The right number is the entire | |
1774 PENDING_STACK_ADJUST less our ADJUSTMENT plus the amount required | |
1775 by the arguments in the first place. */ | |
1776 args_size->constant | |
1777 = pending_stack_adjust - adjustment + unadjusted_args_size; | |
1778 | |
1779 return adjustment; | |
1780 } | |
1781 | |
1782 /* Scan X expression if it does not dereference any argument slots | |
1783 we already clobbered by tail call arguments (as noted in stored_args_map | |
1784 bitmap). | |
1785 Return nonzero if X expression dereferences such argument slots, | |
1786 zero otherwise. */ | |
1787 | |
1788 static int | |
1789 check_sibcall_argument_overlap_1 (rtx x) | |
1790 { | |
1791 RTX_CODE code; | |
1792 int i, j; | |
1793 const char *fmt; | |
1794 | |
1795 if (x == NULL_RTX) | |
1796 return 0; | |
1797 | |
1798 code = GET_CODE (x); | |
1799 | |
1800 if (code == MEM) | |
1801 return mem_overlaps_already_clobbered_arg_p (XEXP (x, 0), | |
1802 GET_MODE_SIZE (GET_MODE (x))); | |
1803 | |
1804 /* Scan all subexpressions. */ | |
1805 fmt = GET_RTX_FORMAT (code); | |
1806 for (i = 0; i < GET_RTX_LENGTH (code); i++, fmt++) | |
1807 { | |
1808 if (*fmt == 'e') | |
1809 { | |
1810 if (check_sibcall_argument_overlap_1 (XEXP (x, i))) | |
1811 return 1; | |
1812 } | |
1813 else if (*fmt == 'E') | |
1814 { | |
1815 for (j = 0; j < XVECLEN (x, i); j++) | |
1816 if (check_sibcall_argument_overlap_1 (XVECEXP (x, i, j))) | |
1817 return 1; | |
1818 } | |
1819 } | |
1820 return 0; | |
1821 } | |
1822 | |
1823 /* Scan sequence after INSN if it does not dereference any argument slots | |
1824 we already clobbered by tail call arguments (as noted in stored_args_map | |
1825 bitmap). If MARK_STORED_ARGS_MAP, add stack slots for ARG to | |
1826 stored_args_map bitmap afterwards (when ARG is a register MARK_STORED_ARGS_MAP | |
1827 should be 0). Return nonzero if sequence after INSN dereferences such argument | |
1828 slots, zero otherwise. */ | |
1829 | |
1830 static int | |
1831 check_sibcall_argument_overlap (rtx insn, struct arg_data *arg, int mark_stored_args_map) | |
1832 { | |
1833 int low, high; | |
1834 | |
1835 if (insn == NULL_RTX) | |
1836 insn = get_insns (); | |
1837 else | |
1838 insn = NEXT_INSN (insn); | |
1839 | |
1840 for (; insn; insn = NEXT_INSN (insn)) | |
1841 if (INSN_P (insn) | |
1842 && check_sibcall_argument_overlap_1 (PATTERN (insn))) | |
1843 break; | |
1844 | |
1845 if (mark_stored_args_map) | |
1846 { | |
1847 #ifdef ARGS_GROW_DOWNWARD | |
1848 low = -arg->locate.slot_offset.constant - arg->locate.size.constant; | |
1849 #else | |
1850 low = arg->locate.slot_offset.constant; | |
1851 #endif | |
1852 | |
1853 for (high = low + arg->locate.size.constant; low < high; low++) | |
1854 SET_BIT (stored_args_map, low); | |
1855 } | |
1856 return insn != NULL_RTX; | |
1857 } | |
1858 | |
1859 /* Given that a function returns a value of mode MODE at the most | |
1860 significant end of hard register VALUE, shift VALUE left or right | |
1861 as specified by LEFT_P. Return true if some action was needed. */ | |
1862 | |
1863 bool | |
1864 shift_return_value (enum machine_mode mode, bool left_p, rtx value) | |
1865 { | |
1866 HOST_WIDE_INT shift; | |
1867 | |
1868 gcc_assert (REG_P (value) && HARD_REGISTER_P (value)); | |
1869 shift = GET_MODE_BITSIZE (GET_MODE (value)) - GET_MODE_BITSIZE (mode); | |
1870 if (shift == 0) | |
1871 return false; | |
1872 | |
1873 /* Use ashr rather than lshr for right shifts. This is for the benefit | |
1874 of the MIPS port, which requires SImode values to be sign-extended | |
1875 when stored in 64-bit registers. */ | |
1876 if (!force_expand_binop (GET_MODE (value), left_p ? ashl_optab : ashr_optab, | |
1877 value, GEN_INT (shift), value, 1, OPTAB_WIDEN)) | |
1878 gcc_unreachable (); | |
1879 return true; | |
1880 } | |
1881 | |
1882 /* If X is a likely-spilled register value, copy it to a pseudo | |
1883 register and return that register. Return X otherwise. */ | |
1884 | |
1885 static rtx | |
1886 avoid_likely_spilled_reg (rtx x) | |
1887 { | |
1888 rtx new_rtx; | |
1889 | |
1890 if (REG_P (x) | |
1891 && HARD_REGISTER_P (x) | |
1892 && CLASS_LIKELY_SPILLED_P (REGNO_REG_CLASS (REGNO (x)))) | |
1893 { | |
1894 /* Make sure that we generate a REG rather than a CONCAT. | |
1895 Moves into CONCATs can need nontrivial instructions, | |
1896 and the whole point of this function is to avoid | |
1897 using the hard register directly in such a situation. */ | |
1898 generating_concat_p = 0; | |
1899 new_rtx = gen_reg_rtx (GET_MODE (x)); | |
1900 generating_concat_p = 1; | |
1901 emit_move_insn (new_rtx, x); | |
1902 return new_rtx; | |
1903 } | |
1904 return x; | |
1905 } | |
1906 | |
1907 /* Generate all the code for a CALL_EXPR exp | |
1908 and return an rtx for its value. | |
1909 Store the value in TARGET (specified as an rtx) if convenient. | |
1910 If the value is stored in TARGET then TARGET is returned. | |
1911 If IGNORE is nonzero, then we ignore the value of the function call. */ | |
1912 | |
1913 rtx | |
1914 expand_call (tree exp, rtx target, int ignore) | |
1915 { | |
1916 /* Nonzero if we are currently expanding a call. */ | |
1917 static int currently_expanding_call = 0; | |
1918 | |
1919 /* RTX for the function to be called. */ | |
1920 rtx funexp; | |
1921 /* Sequence of insns to perform a normal "call". */ | |
1922 rtx normal_call_insns = NULL_RTX; | |
1923 /* Sequence of insns to perform a tail "call". */ | |
1924 rtx tail_call_insns = NULL_RTX; | |
1925 /* Data type of the function. */ | |
1926 tree funtype; | |
1927 tree type_arg_types; | |
1928 /* Declaration of the function being called, | |
1929 or 0 if the function is computed (not known by name). */ | |
1930 tree fndecl = 0; | |
1931 /* The type of the function being called. */ | |
1932 tree fntype; | |
1933 bool try_tail_call = CALL_EXPR_TAILCALL (exp); | |
1934 int pass; | |
1935 | |
1936 /* Register in which non-BLKmode value will be returned, | |
1937 or 0 if no value or if value is BLKmode. */ | |
1938 rtx valreg; | |
1939 /* Address where we should return a BLKmode value; | |
1940 0 if value not BLKmode. */ | |
1941 rtx structure_value_addr = 0; | |
1942 /* Nonzero if that address is being passed by treating it as | |
1943 an extra, implicit first parameter. Otherwise, | |
1944 it is passed by being copied directly into struct_value_rtx. */ | |
1945 int structure_value_addr_parm = 0; | |
1946 /* Holds the value of implicit argument for the struct value. */ | |
1947 tree structure_value_addr_value = NULL_TREE; | |
1948 /* Size of aggregate value wanted, or zero if none wanted | |
1949 or if we are using the non-reentrant PCC calling convention | |
1950 or expecting the value in registers. */ | |
1951 HOST_WIDE_INT struct_value_size = 0; | |
1952 /* Nonzero if called function returns an aggregate in memory PCC style, | |
1953 by returning the address of where to find it. */ | |
1954 int pcc_struct_value = 0; | |
1955 rtx struct_value = 0; | |
1956 | |
1957 /* Number of actual parameters in this call, including struct value addr. */ | |
1958 int num_actuals; | |
1959 /* Number of named args. Args after this are anonymous ones | |
1960 and they must all go on the stack. */ | |
1961 int n_named_args; | |
1962 /* Number of complex actual arguments that need to be split. */ | |
1963 int num_complex_actuals = 0; | |
1964 | |
1965 /* Vector of information about each argument. | |
1966 Arguments are numbered in the order they will be pushed, | |
1967 not the order they are written. */ | |
1968 struct arg_data *args; | |
1969 | |
1970 /* Total size in bytes of all the stack-parms scanned so far. */ | |
1971 struct args_size args_size; | |
1972 struct args_size adjusted_args_size; | |
1973 /* Size of arguments before any adjustments (such as rounding). */ | |
1974 int unadjusted_args_size; | |
1975 /* Data on reg parms scanned so far. */ | |
1976 CUMULATIVE_ARGS args_so_far; | |
1977 /* Nonzero if a reg parm has been scanned. */ | |
1978 int reg_parm_seen; | |
1979 /* Nonzero if this is an indirect function call. */ | |
1980 | |
1981 /* Nonzero if we must avoid push-insns in the args for this call. | |
1982 If stack space is allocated for register parameters, but not by the | |
1983 caller, then it is preallocated in the fixed part of the stack frame. | |
1984 So the entire argument block must then be preallocated (i.e., we | |
1985 ignore PUSH_ROUNDING in that case). */ | |
1986 | |
1987 int must_preallocate = !PUSH_ARGS; | |
1988 | |
1989 /* Size of the stack reserved for parameter registers. */ | |
1990 int reg_parm_stack_space = 0; | |
1991 | |
1992 /* Address of space preallocated for stack parms | |
1993 (on machines that lack push insns), or 0 if space not preallocated. */ | |
1994 rtx argblock = 0; | |
1995 | |
1996 /* Mask of ECF_ flags. */ | |
1997 int flags = 0; | |
1998 #ifdef REG_PARM_STACK_SPACE | |
1999 /* Define the boundary of the register parm stack space that needs to be | |
2000 saved, if any. */ | |
2001 int low_to_save, high_to_save; | |
2002 rtx save_area = 0; /* Place that it is saved */ | |
2003 #endif | |
2004 | |
2005 int initial_highest_arg_in_use = highest_outgoing_arg_in_use; | |
2006 char *initial_stack_usage_map = stack_usage_map; | |
2007 char *stack_usage_map_buf = NULL; | |
2008 | |
2009 int old_stack_allocated; | |
2010 | |
2011 /* State variables to track stack modifications. */ | |
2012 rtx old_stack_level = 0; | |
2013 int old_stack_arg_under_construction = 0; | |
2014 int old_pending_adj = 0; | |
2015 int old_inhibit_defer_pop = inhibit_defer_pop; | |
2016 | |
2017 /* Some stack pointer alterations we make are performed via | |
2018 allocate_dynamic_stack_space. This modifies the stack_pointer_delta, | |
2019 which we then also need to save/restore along the way. */ | |
2020 int old_stack_pointer_delta = 0; | |
2021 | |
2022 rtx call_fusage; | |
2023 tree p = CALL_EXPR_FN (exp); | |
2024 tree addr = CALL_EXPR_FN (exp); | |
2025 int i; | |
2026 /* The alignment of the stack, in bits. */ | |
2027 unsigned HOST_WIDE_INT preferred_stack_boundary; | |
2028 /* The alignment of the stack, in bytes. */ | |
2029 unsigned HOST_WIDE_INT preferred_unit_stack_boundary; | |
2030 /* The static chain value to use for this call. */ | |
2031 rtx static_chain_value; | |
2032 /* See if this is "nothrow" function call. */ | |
2033 if (TREE_NOTHROW (exp)) | |
2034 flags |= ECF_NOTHROW; | |
2035 | |
2036 /* See if we can find a DECL-node for the actual function, and get the | |
2037 function attributes (flags) from the function decl or type node. */ | |
2038 fndecl = get_callee_fndecl (exp); | |
2039 if (fndecl) | |
2040 { | |
2041 fntype = TREE_TYPE (fndecl); | |
2042 flags |= flags_from_decl_or_type (fndecl); | |
2043 } | |
2044 else | |
2045 { | |
2046 fntype = TREE_TYPE (TREE_TYPE (p)); | |
2047 flags |= flags_from_decl_or_type (fntype); | |
2048 } | |
2049 | |
2050 struct_value = targetm.calls.struct_value_rtx (fntype, 0); | |
2051 | |
2052 /* Warn if this value is an aggregate type, | |
2053 regardless of which calling convention we are using for it. */ | |
2054 if (AGGREGATE_TYPE_P (TREE_TYPE (exp))) | |
2055 warning (OPT_Waggregate_return, "function call has aggregate value"); | |
2056 | |
2057 /* If the result of a non looping pure or const function call is | |
2058 ignored (or void), and none of its arguments are volatile, we can | |
2059 avoid expanding the call and just evaluate the arguments for | |
2060 side-effects. */ | |
2061 if ((flags & (ECF_CONST | ECF_PURE)) | |
2062 && (!(flags & ECF_LOOPING_CONST_OR_PURE)) | |
2063 && (ignore || target == const0_rtx | |
2064 || TYPE_MODE (TREE_TYPE (exp)) == VOIDmode)) | |
2065 { | |
2066 bool volatilep = false; | |
2067 tree arg; | |
2068 call_expr_arg_iterator iter; | |
2069 | |
2070 FOR_EACH_CALL_EXPR_ARG (arg, iter, exp) | |
2071 if (TREE_THIS_VOLATILE (arg)) | |
2072 { | |
2073 volatilep = true; | |
2074 break; | |
2075 } | |
2076 | |
2077 if (! volatilep) | |
2078 { | |
2079 FOR_EACH_CALL_EXPR_ARG (arg, iter, exp) | |
2080 expand_expr (arg, const0_rtx, VOIDmode, EXPAND_NORMAL); | |
2081 return const0_rtx; | |
2082 } | |
2083 } | |
2084 | |
2085 #ifdef REG_PARM_STACK_SPACE | |
2086 reg_parm_stack_space = REG_PARM_STACK_SPACE (!fndecl ? fntype : fndecl); | |
2087 #endif | |
2088 | |
2089 if (! OUTGOING_REG_PARM_STACK_SPACE ((!fndecl ? fntype : TREE_TYPE (fndecl))) | |
2090 && reg_parm_stack_space > 0 && PUSH_ARGS) | |
2091 must_preallocate = 1; | |
2092 | |
2093 /* Set up a place to return a structure. */ | |
2094 | |
2095 /* Cater to broken compilers. */ | |
2096 if (aggregate_value_p (exp, (!fndecl ? fntype : fndecl))) | |
2097 { | |
2098 /* This call returns a big structure. */ | |
2099 flags &= ~(ECF_CONST | ECF_PURE | ECF_LOOPING_CONST_OR_PURE); | |
2100 | |
2101 #ifdef PCC_STATIC_STRUCT_RETURN | |
2102 { | |
2103 pcc_struct_value = 1; | |
2104 } | |
2105 #else /* not PCC_STATIC_STRUCT_RETURN */ | |
2106 { | |
2107 struct_value_size = int_size_in_bytes (TREE_TYPE (exp)); | |
2108 | |
2109 if (target && MEM_P (target) && CALL_EXPR_RETURN_SLOT_OPT (exp)) | |
2110 structure_value_addr = XEXP (target, 0); | |
2111 else | |
2112 { | |
2113 /* For variable-sized objects, we must be called with a target | |
2114 specified. If we were to allocate space on the stack here, | |
2115 we would have no way of knowing when to free it. */ | |
2116 rtx d = assign_temp (TREE_TYPE (exp), 0, 1, 1); | |
2117 | |
2118 mark_temp_addr_taken (d); | |
2119 structure_value_addr = XEXP (d, 0); | |
2120 target = 0; | |
2121 } | |
2122 } | |
2123 #endif /* not PCC_STATIC_STRUCT_RETURN */ | |
2124 } | |
2125 | |
2126 /* Figure out the amount to which the stack should be aligned. */ | |
2127 preferred_stack_boundary = PREFERRED_STACK_BOUNDARY; | |
2128 if (fndecl) | |
2129 { | |
2130 struct cgraph_rtl_info *i = cgraph_rtl_info (fndecl); | |
2131 /* Without automatic stack alignment, we can't increase preferred | |
2132 stack boundary. With automatic stack alignment, it is | |
2133 unnecessary since unless we can guarantee that all callers will | |
2134 align the outgoing stack properly, callee has to align its | |
2135 stack anyway. */ | |
2136 if (i | |
2137 && i->preferred_incoming_stack_boundary | |
2138 && i->preferred_incoming_stack_boundary < preferred_stack_boundary) | |
2139 preferred_stack_boundary = i->preferred_incoming_stack_boundary; | |
2140 } | |
2141 | |
2142 /* Operand 0 is a pointer-to-function; get the type of the function. */ | |
2143 funtype = TREE_TYPE (addr); | |
2144 gcc_assert (POINTER_TYPE_P (funtype)); | |
2145 funtype = TREE_TYPE (funtype); | |
2146 | |
2147 /* Count whether there are actual complex arguments that need to be split | |
2148 into their real and imaginary parts. Munge the type_arg_types | |
2149 appropriately here as well. */ | |
2150 if (targetm.calls.split_complex_arg) | |
2151 { | |
2152 call_expr_arg_iterator iter; | |
2153 tree arg; | |
2154 FOR_EACH_CALL_EXPR_ARG (arg, iter, exp) | |
2155 { | |
2156 tree type = TREE_TYPE (arg); | |
2157 if (type && TREE_CODE (type) == COMPLEX_TYPE | |
2158 && targetm.calls.split_complex_arg (type)) | |
2159 num_complex_actuals++; | |
2160 } | |
2161 type_arg_types = split_complex_types (TYPE_ARG_TYPES (funtype)); | |
2162 } | |
2163 else | |
2164 type_arg_types = TYPE_ARG_TYPES (funtype); | |
2165 | |
2166 if (flags & ECF_MAY_BE_ALLOCA) | |
2167 cfun->calls_alloca = 1; | |
2168 | |
2169 /* If struct_value_rtx is 0, it means pass the address | |
2170 as if it were an extra parameter. Put the argument expression | |
2171 in structure_value_addr_value. */ | |
2172 if (structure_value_addr && struct_value == 0) | |
2173 { | |
2174 /* If structure_value_addr is a REG other than | |
2175 virtual_outgoing_args_rtx, we can use always use it. If it | |
2176 is not a REG, we must always copy it into a register. | |
2177 If it is virtual_outgoing_args_rtx, we must copy it to another | |
2178 register in some cases. */ | |
2179 rtx temp = (!REG_P (structure_value_addr) | |
2180 || (ACCUMULATE_OUTGOING_ARGS | |
2181 && stack_arg_under_construction | |
2182 && structure_value_addr == virtual_outgoing_args_rtx) | |
2183 ? copy_addr_to_reg (convert_memory_address | |
2184 (Pmode, structure_value_addr)) | |
2185 : structure_value_addr); | |
2186 | |
2187 structure_value_addr_value = | |
2188 make_tree (build_pointer_type (TREE_TYPE (funtype)), temp); | |
2189 structure_value_addr_parm = 1; | |
2190 } | |
2191 | |
2192 /* Count the arguments and set NUM_ACTUALS. */ | |
2193 num_actuals = | |
2194 call_expr_nargs (exp) + num_complex_actuals + structure_value_addr_parm; | |
2195 | |
2196 /* Compute number of named args. | |
2197 First, do a raw count of the args for INIT_CUMULATIVE_ARGS. */ | |
2198 | |
2199 if (type_arg_types != 0) | |
2200 n_named_args | |
2201 = (list_length (type_arg_types) | |
2202 /* Count the struct value address, if it is passed as a parm. */ | |
2203 + structure_value_addr_parm); | |
2204 else | |
2205 /* If we know nothing, treat all args as named. */ | |
2206 n_named_args = num_actuals; | |
2207 | |
2208 /* Start updating where the next arg would go. | |
2209 | |
2210 On some machines (such as the PA) indirect calls have a different | |
2211 calling convention than normal calls. The fourth argument in | |
2212 INIT_CUMULATIVE_ARGS tells the backend if this is an indirect call | |
2213 or not. */ | |
2214 INIT_CUMULATIVE_ARGS (args_so_far, funtype, NULL_RTX, fndecl, n_named_args); | |
2215 | |
2216 /* Now possibly adjust the number of named args. | |
2217 Normally, don't include the last named arg if anonymous args follow. | |
2218 We do include the last named arg if | |
2219 targetm.calls.strict_argument_naming() returns nonzero. | |
2220 (If no anonymous args follow, the result of list_length is actually | |
2221 one too large. This is harmless.) | |
2222 | |
2223 If targetm.calls.pretend_outgoing_varargs_named() returns | |
2224 nonzero, and targetm.calls.strict_argument_naming() returns zero, | |
2225 this machine will be able to place unnamed args that were passed | |
2226 in registers into the stack. So treat all args as named. This | |
2227 allows the insns emitting for a specific argument list to be | |
2228 independent of the function declaration. | |
2229 | |
2230 If targetm.calls.pretend_outgoing_varargs_named() returns zero, | |
2231 we do not have any reliable way to pass unnamed args in | |
2232 registers, so we must force them into memory. */ | |
2233 | |
2234 if (type_arg_types != 0 | |
2235 && targetm.calls.strict_argument_naming (&args_so_far)) | |
2236 ; | |
2237 else if (type_arg_types != 0 | |
2238 && ! targetm.calls.pretend_outgoing_varargs_named (&args_so_far)) | |
2239 /* Don't include the last named arg. */ | |
2240 --n_named_args; | |
2241 else | |
2242 /* Treat all args as named. */ | |
2243 n_named_args = num_actuals; | |
2244 | |
2245 /* Make a vector to hold all the information about each arg. */ | |
2246 args = XALLOCAVEC (struct arg_data, num_actuals); | |
2247 memset (args, 0, num_actuals * sizeof (struct arg_data)); | |
2248 | |
2249 /* Build up entries in the ARGS array, compute the size of the | |
2250 arguments into ARGS_SIZE, etc. */ | |
2251 initialize_argument_information (num_actuals, args, &args_size, | |
2252 n_named_args, exp, | |
2253 structure_value_addr_value, fndecl, fntype, | |
2254 &args_so_far, reg_parm_stack_space, | |
2255 &old_stack_level, &old_pending_adj, | |
2256 &must_preallocate, &flags, | |
2257 &try_tail_call, CALL_FROM_THUNK_P (exp)); | |
2258 | |
2259 if (args_size.var) | |
2260 must_preallocate = 1; | |
2261 | |
2262 /* Now make final decision about preallocating stack space. */ | |
2263 must_preallocate = finalize_must_preallocate (must_preallocate, | |
2264 num_actuals, args, | |
2265 &args_size); | |
2266 | |
2267 /* If the structure value address will reference the stack pointer, we | |
2268 must stabilize it. We don't need to do this if we know that we are | |
2269 not going to adjust the stack pointer in processing this call. */ | |
2270 | |
2271 if (structure_value_addr | |
2272 && (reg_mentioned_p (virtual_stack_dynamic_rtx, structure_value_addr) | |
2273 || reg_mentioned_p (virtual_outgoing_args_rtx, | |
2274 structure_value_addr)) | |
2275 && (args_size.var | |
2276 || (!ACCUMULATE_OUTGOING_ARGS && args_size.constant))) | |
2277 structure_value_addr = copy_to_reg (structure_value_addr); | |
2278 | |
2279 /* Tail calls can make things harder to debug, and we've traditionally | |
2280 pushed these optimizations into -O2. Don't try if we're already | |
2281 expanding a call, as that means we're an argument. Don't try if | |
2282 there's cleanups, as we know there's code to follow the call. */ | |
2283 | |
2284 if (currently_expanding_call++ != 0 | |
2285 || !flag_optimize_sibling_calls | |
2286 || args_size.var | |
2287 || lookup_expr_eh_region (exp) >= 0 | |
2288 || dbg_cnt (tail_call) == false) | |
2289 try_tail_call = 0; | |
2290 | |
2291 /* Rest of purposes for tail call optimizations to fail. */ | |
2292 if ( | |
2293 #ifdef HAVE_sibcall_epilogue | |
2294 !HAVE_sibcall_epilogue | |
2295 #else | |
2296 1 | |
2297 #endif | |
2298 || !try_tail_call | |
2299 /* Doing sibling call optimization needs some work, since | |
2300 structure_value_addr can be allocated on the stack. | |
2301 It does not seem worth the effort since few optimizable | |
2302 sibling calls will return a structure. */ | |
2303 || structure_value_addr != NULL_RTX | |
2304 #ifdef REG_PARM_STACK_SPACE | |
2305 /* If outgoing reg parm stack space changes, we can not do sibcall. */ | |
2306 || (OUTGOING_REG_PARM_STACK_SPACE (funtype) | |
2307 != OUTGOING_REG_PARM_STACK_SPACE (TREE_TYPE (current_function_decl))) | |
2308 || (reg_parm_stack_space != REG_PARM_STACK_SPACE (fndecl)) | |
2309 #endif | |
2310 /* Check whether the target is able to optimize the call | |
2311 into a sibcall. */ | |
2312 || !targetm.function_ok_for_sibcall (fndecl, exp) | |
2313 /* Functions that do not return exactly once may not be sibcall | |
2314 optimized. */ | |
2315 || (flags & (ECF_RETURNS_TWICE | ECF_NORETURN)) | |
2316 || TYPE_VOLATILE (TREE_TYPE (TREE_TYPE (addr))) | |
2317 /* If the called function is nested in the current one, it might access | |
2318 some of the caller's arguments, but could clobber them beforehand if | |
2319 the argument areas are shared. */ | |
2320 || (fndecl && decl_function_context (fndecl) == current_function_decl) | |
2321 /* If this function requires more stack slots than the current | |
2322 function, we cannot change it into a sibling call. | |
2323 crtl->args.pretend_args_size is not part of the | |
2324 stack allocated by our caller. */ | |
2325 || args_size.constant > (crtl->args.size | |
2326 - crtl->args.pretend_args_size) | |
2327 /* If the callee pops its own arguments, then it must pop exactly | |
2328 the same number of arguments as the current function. */ | |
2329 || (RETURN_POPS_ARGS (fndecl, funtype, args_size.constant) | |
2330 != RETURN_POPS_ARGS (current_function_decl, | |
2331 TREE_TYPE (current_function_decl), | |
2332 crtl->args.size)) | |
2333 || !lang_hooks.decls.ok_for_sibcall (fndecl)) | |
2334 try_tail_call = 0; | |
2335 | |
2336 /* Check if caller and callee disagree in promotion of function | |
2337 return value. */ | |
2338 if (try_tail_call) | |
2339 { | |
2340 enum machine_mode caller_mode, caller_promoted_mode; | |
2341 enum machine_mode callee_mode, callee_promoted_mode; | |
2342 int caller_unsignedp, callee_unsignedp; | |
2343 tree caller_res = DECL_RESULT (current_function_decl); | |
2344 | |
2345 caller_unsignedp = TYPE_UNSIGNED (TREE_TYPE (caller_res)); | |
2346 caller_mode = caller_promoted_mode = DECL_MODE (caller_res); | |
2347 callee_unsignedp = TYPE_UNSIGNED (TREE_TYPE (funtype)); | |
2348 callee_mode = callee_promoted_mode = TYPE_MODE (TREE_TYPE (funtype)); | |
2349 if (targetm.calls.promote_function_return (TREE_TYPE (current_function_decl))) | |
2350 caller_promoted_mode | |
2351 = promote_mode (TREE_TYPE (caller_res), caller_mode, | |
2352 &caller_unsignedp, 1); | |
2353 if (targetm.calls.promote_function_return (funtype)) | |
2354 callee_promoted_mode | |
2355 = promote_mode (TREE_TYPE (funtype), callee_mode, | |
2356 &callee_unsignedp, 1); | |
2357 if (caller_mode != VOIDmode | |
2358 && (caller_promoted_mode != callee_promoted_mode | |
2359 || ((caller_mode != caller_promoted_mode | |
2360 || callee_mode != callee_promoted_mode) | |
2361 && (caller_unsignedp != callee_unsignedp | |
2362 || GET_MODE_BITSIZE (caller_mode) | |
2363 < GET_MODE_BITSIZE (callee_mode))))) | |
2364 try_tail_call = 0; | |
2365 } | |
2366 | |
2367 /* Ensure current function's preferred stack boundary is at least | |
2368 what we need. Stack alignment may also increase preferred stack | |
2369 boundary. */ | |
2370 if (crtl->preferred_stack_boundary < preferred_stack_boundary) | |
2371 crtl->preferred_stack_boundary = preferred_stack_boundary; | |
2372 else | |
2373 preferred_stack_boundary = crtl->preferred_stack_boundary; | |
2374 | |
2375 preferred_unit_stack_boundary = preferred_stack_boundary / BITS_PER_UNIT; | |
2376 | |
2377 /* We want to make two insn chains; one for a sibling call, the other | |
2378 for a normal call. We will select one of the two chains after | |
2379 initial RTL generation is complete. */ | |
2380 for (pass = try_tail_call ? 0 : 1; pass < 2; pass++) | |
2381 { | |
2382 int sibcall_failure = 0; | |
2383 /* We want to emit any pending stack adjustments before the tail | |
2384 recursion "call". That way we know any adjustment after the tail | |
2385 recursion call can be ignored if we indeed use the tail | |
2386 call expansion. */ | |
2387 int save_pending_stack_adjust = 0; | |
2388 int save_stack_pointer_delta = 0; | |
2389 rtx insns; | |
2390 rtx before_call, next_arg_reg, after_args; | |
2391 | |
2392 if (pass == 0) | |
2393 { | |
2394 /* State variables we need to save and restore between | |
2395 iterations. */ | |
2396 save_pending_stack_adjust = pending_stack_adjust; | |
2397 save_stack_pointer_delta = stack_pointer_delta; | |
2398 } | |
2399 if (pass) | |
2400 flags &= ~ECF_SIBCALL; | |
2401 else | |
2402 flags |= ECF_SIBCALL; | |
2403 | |
2404 /* Other state variables that we must reinitialize each time | |
2405 through the loop (that are not initialized by the loop itself). */ | |
2406 argblock = 0; | |
2407 call_fusage = 0; | |
2408 | |
2409 /* Start a new sequence for the normal call case. | |
2410 | |
2411 From this point on, if the sibling call fails, we want to set | |
2412 sibcall_failure instead of continuing the loop. */ | |
2413 start_sequence (); | |
2414 | |
2415 /* Don't let pending stack adjusts add up to too much. | |
2416 Also, do all pending adjustments now if there is any chance | |
2417 this might be a call to alloca or if we are expanding a sibling | |
2418 call sequence. | |
2419 Also do the adjustments before a throwing call, otherwise | |
2420 exception handling can fail; PR 19225. */ | |
2421 if (pending_stack_adjust >= 32 | |
2422 || (pending_stack_adjust > 0 | |
2423 && (flags & ECF_MAY_BE_ALLOCA)) | |
2424 || (pending_stack_adjust > 0 | |
2425 && flag_exceptions && !(flags & ECF_NOTHROW)) | |
2426 || pass == 0) | |
2427 do_pending_stack_adjust (); | |
2428 | |
2429 /* Precompute any arguments as needed. */ | |
2430 if (pass) | |
2431 precompute_arguments (num_actuals, args); | |
2432 | |
2433 /* Now we are about to start emitting insns that can be deleted | |
2434 if a libcall is deleted. */ | |
2435 if (pass && (flags & ECF_MALLOC)) | |
2436 start_sequence (); | |
2437 | |
2438 if (pass == 0 && crtl->stack_protect_guard) | |
2439 stack_protect_epilogue (); | |
2440 | |
2441 adjusted_args_size = args_size; | |
2442 /* Compute the actual size of the argument block required. The variable | |
2443 and constant sizes must be combined, the size may have to be rounded, | |
2444 and there may be a minimum required size. When generating a sibcall | |
2445 pattern, do not round up, since we'll be re-using whatever space our | |
2446 caller provided. */ | |
2447 unadjusted_args_size | |
2448 = compute_argument_block_size (reg_parm_stack_space, | |
2449 &adjusted_args_size, | |
2450 fndecl, fntype, | |
2451 (pass == 0 ? 0 | |
2452 : preferred_stack_boundary)); | |
2453 | |
2454 old_stack_allocated = stack_pointer_delta - pending_stack_adjust; | |
2455 | |
2456 /* The argument block when performing a sibling call is the | |
2457 incoming argument block. */ | |
2458 if (pass == 0) | |
2459 { | |
2460 argblock = crtl->args.internal_arg_pointer; | |
2461 argblock | |
2462 #ifdef STACK_GROWS_DOWNWARD | |
2463 = plus_constant (argblock, crtl->args.pretend_args_size); | |
2464 #else | |
2465 = plus_constant (argblock, -crtl->args.pretend_args_size); | |
2466 #endif | |
2467 stored_args_map = sbitmap_alloc (args_size.constant); | |
2468 sbitmap_zero (stored_args_map); | |
2469 } | |
2470 | |
2471 /* If we have no actual push instructions, or shouldn't use them, | |
2472 make space for all args right now. */ | |
2473 else if (adjusted_args_size.var != 0) | |
2474 { | |
2475 if (old_stack_level == 0) | |
2476 { | |
2477 emit_stack_save (SAVE_BLOCK, &old_stack_level, NULL_RTX); | |
2478 old_stack_pointer_delta = stack_pointer_delta; | |
2479 old_pending_adj = pending_stack_adjust; | |
2480 pending_stack_adjust = 0; | |
2481 /* stack_arg_under_construction says whether a stack arg is | |
2482 being constructed at the old stack level. Pushing the stack | |
2483 gets a clean outgoing argument block. */ | |
2484 old_stack_arg_under_construction = stack_arg_under_construction; | |
2485 stack_arg_under_construction = 0; | |
2486 } | |
2487 argblock = push_block (ARGS_SIZE_RTX (adjusted_args_size), 0, 0); | |
2488 } | |
2489 else | |
2490 { | |
2491 /* Note that we must go through the motions of allocating an argument | |
2492 block even if the size is zero because we may be storing args | |
2493 in the area reserved for register arguments, which may be part of | |
2494 the stack frame. */ | |
2495 | |
2496 int needed = adjusted_args_size.constant; | |
2497 | |
2498 /* Store the maximum argument space used. It will be pushed by | |
2499 the prologue (if ACCUMULATE_OUTGOING_ARGS, or stack overflow | |
2500 checking). */ | |
2501 | |
2502 if (needed > crtl->outgoing_args_size) | |
2503 crtl->outgoing_args_size = needed; | |
2504 | |
2505 if (must_preallocate) | |
2506 { | |
2507 if (ACCUMULATE_OUTGOING_ARGS) | |
2508 { | |
2509 /* Since the stack pointer will never be pushed, it is | |
2510 possible for the evaluation of a parm to clobber | |
2511 something we have already written to the stack. | |
2512 Since most function calls on RISC machines do not use | |
2513 the stack, this is uncommon, but must work correctly. | |
2514 | |
2515 Therefore, we save any area of the stack that was already | |
2516 written and that we are using. Here we set up to do this | |
2517 by making a new stack usage map from the old one. The | |
2518 actual save will be done by store_one_arg. | |
2519 | |
2520 Another approach might be to try to reorder the argument | |
2521 evaluations to avoid this conflicting stack usage. */ | |
2522 | |
2523 /* Since we will be writing into the entire argument area, | |
2524 the map must be allocated for its entire size, not just | |
2525 the part that is the responsibility of the caller. */ | |
2526 if (! OUTGOING_REG_PARM_STACK_SPACE ((!fndecl ? fntype : TREE_TYPE (fndecl)))) | |
2527 needed += reg_parm_stack_space; | |
2528 | |
2529 #ifdef ARGS_GROW_DOWNWARD | |
2530 highest_outgoing_arg_in_use = MAX (initial_highest_arg_in_use, | |
2531 needed + 1); | |
2532 #else | |
2533 highest_outgoing_arg_in_use = MAX (initial_highest_arg_in_use, | |
2534 needed); | |
2535 #endif | |
2536 if (stack_usage_map_buf) | |
2537 free (stack_usage_map_buf); | |
2538 stack_usage_map_buf = XNEWVEC (char, highest_outgoing_arg_in_use); | |
2539 stack_usage_map = stack_usage_map_buf; | |
2540 | |
2541 if (initial_highest_arg_in_use) | |
2542 memcpy (stack_usage_map, initial_stack_usage_map, | |
2543 initial_highest_arg_in_use); | |
2544 | |
2545 if (initial_highest_arg_in_use != highest_outgoing_arg_in_use) | |
2546 memset (&stack_usage_map[initial_highest_arg_in_use], 0, | |
2547 (highest_outgoing_arg_in_use | |
2548 - initial_highest_arg_in_use)); | |
2549 needed = 0; | |
2550 | |
2551 /* The address of the outgoing argument list must not be | |
2552 copied to a register here, because argblock would be left | |
2553 pointing to the wrong place after the call to | |
2554 allocate_dynamic_stack_space below. */ | |
2555 | |
2556 argblock = virtual_outgoing_args_rtx; | |
2557 } | |
2558 else | |
2559 { | |
2560 if (inhibit_defer_pop == 0) | |
2561 { | |
2562 /* Try to reuse some or all of the pending_stack_adjust | |
2563 to get this space. */ | |
2564 needed | |
2565 = (combine_pending_stack_adjustment_and_call | |
2566 (unadjusted_args_size, | |
2567 &adjusted_args_size, | |
2568 preferred_unit_stack_boundary)); | |
2569 | |
2570 /* combine_pending_stack_adjustment_and_call computes | |
2571 an adjustment before the arguments are allocated. | |
2572 Account for them and see whether or not the stack | |
2573 needs to go up or down. */ | |
2574 needed = unadjusted_args_size - needed; | |
2575 | |
2576 if (needed < 0) | |
2577 { | |
2578 /* We're releasing stack space. */ | |
2579 /* ??? We can avoid any adjustment at all if we're | |
2580 already aligned. FIXME. */ | |
2581 pending_stack_adjust = -needed; | |
2582 do_pending_stack_adjust (); | |
2583 needed = 0; | |
2584 } | |
2585 else | |
2586 /* We need to allocate space. We'll do that in | |
2587 push_block below. */ | |
2588 pending_stack_adjust = 0; | |
2589 } | |
2590 | |
2591 /* Special case this because overhead of `push_block' in | |
2592 this case is non-trivial. */ | |
2593 if (needed == 0) | |
2594 argblock = virtual_outgoing_args_rtx; | |
2595 else | |
2596 { | |
2597 argblock = push_block (GEN_INT (needed), 0, 0); | |
2598 #ifdef ARGS_GROW_DOWNWARD | |
2599 argblock = plus_constant (argblock, needed); | |
2600 #endif | |
2601 } | |
2602 | |
2603 /* We only really need to call `copy_to_reg' in the case | |
2604 where push insns are going to be used to pass ARGBLOCK | |
2605 to a function call in ARGS. In that case, the stack | |
2606 pointer changes value from the allocation point to the | |
2607 call point, and hence the value of | |
2608 VIRTUAL_OUTGOING_ARGS_RTX changes as well. But might | |
2609 as well always do it. */ | |
2610 argblock = copy_to_reg (argblock); | |
2611 } | |
2612 } | |
2613 } | |
2614 | |
2615 if (ACCUMULATE_OUTGOING_ARGS) | |
2616 { | |
2617 /* The save/restore code in store_one_arg handles all | |
2618 cases except one: a constructor call (including a C | |
2619 function returning a BLKmode struct) to initialize | |
2620 an argument. */ | |
2621 if (stack_arg_under_construction) | |
2622 { | |
2623 rtx push_size | |
2624 = GEN_INT (adjusted_args_size.constant | |
2625 + (OUTGOING_REG_PARM_STACK_SPACE ((!fndecl ? fntype | |
2626 : TREE_TYPE (fndecl))) ? 0 | |
2627 : reg_parm_stack_space)); | |
2628 if (old_stack_level == 0) | |
2629 { | |
2630 emit_stack_save (SAVE_BLOCK, &old_stack_level, | |
2631 NULL_RTX); | |
2632 old_stack_pointer_delta = stack_pointer_delta; | |
2633 old_pending_adj = pending_stack_adjust; | |
2634 pending_stack_adjust = 0; | |
2635 /* stack_arg_under_construction says whether a stack | |
2636 arg is being constructed at the old stack level. | |
2637 Pushing the stack gets a clean outgoing argument | |
2638 block. */ | |
2639 old_stack_arg_under_construction | |
2640 = stack_arg_under_construction; | |
2641 stack_arg_under_construction = 0; | |
2642 /* Make a new map for the new argument list. */ | |
2643 if (stack_usage_map_buf) | |
2644 free (stack_usage_map_buf); | |
2645 stack_usage_map_buf = XCNEWVEC (char, highest_outgoing_arg_in_use); | |
2646 stack_usage_map = stack_usage_map_buf; | |
2647 highest_outgoing_arg_in_use = 0; | |
2648 } | |
2649 allocate_dynamic_stack_space (push_size, NULL_RTX, | |
2650 BITS_PER_UNIT); | |
2651 } | |
2652 | |
2653 /* If argument evaluation might modify the stack pointer, | |
2654 copy the address of the argument list to a register. */ | |
2655 for (i = 0; i < num_actuals; i++) | |
2656 if (args[i].pass_on_stack) | |
2657 { | |
2658 argblock = copy_addr_to_reg (argblock); | |
2659 break; | |
2660 } | |
2661 } | |
2662 | |
2663 compute_argument_addresses (args, argblock, num_actuals); | |
2664 | |
2665 /* If we push args individually in reverse order, perform stack alignment | |
2666 before the first push (the last arg). */ | |
2667 if (PUSH_ARGS_REVERSED && argblock == 0 | |
2668 && adjusted_args_size.constant != unadjusted_args_size) | |
2669 { | |
2670 /* When the stack adjustment is pending, we get better code | |
2671 by combining the adjustments. */ | |
2672 if (pending_stack_adjust | |
2673 && ! inhibit_defer_pop) | |
2674 { | |
2675 pending_stack_adjust | |
2676 = (combine_pending_stack_adjustment_and_call | |
2677 (unadjusted_args_size, | |
2678 &adjusted_args_size, | |
2679 preferred_unit_stack_boundary)); | |
2680 do_pending_stack_adjust (); | |
2681 } | |
2682 else if (argblock == 0) | |
2683 anti_adjust_stack (GEN_INT (adjusted_args_size.constant | |
2684 - unadjusted_args_size)); | |
2685 } | |
2686 /* Now that the stack is properly aligned, pops can't safely | |
2687 be deferred during the evaluation of the arguments. */ | |
2688 NO_DEFER_POP; | |
2689 | |
2690 funexp = rtx_for_function_call (fndecl, addr); | |
2691 | |
2692 /* Figure out the register where the value, if any, will come back. */ | |
2693 valreg = 0; | |
2694 if (TYPE_MODE (TREE_TYPE (exp)) != VOIDmode | |
2695 && ! structure_value_addr) | |
2696 { | |
2697 if (pcc_struct_value) | |
2698 valreg = hard_function_value (build_pointer_type (TREE_TYPE (exp)), | |
2699 fndecl, NULL, (pass == 0)); | |
2700 else | |
2701 valreg = hard_function_value (TREE_TYPE (exp), fndecl, fntype, | |
2702 (pass == 0)); | |
2703 | |
2704 /* If VALREG is a PARALLEL whose first member has a zero | |
2705 offset, use that. This is for targets such as m68k that | |
2706 return the same value in multiple places. */ | |
2707 if (GET_CODE (valreg) == PARALLEL) | |
2708 { | |
2709 rtx elem = XVECEXP (valreg, 0, 0); | |
2710 rtx where = XEXP (elem, 0); | |
2711 rtx offset = XEXP (elem, 1); | |
2712 if (offset == const0_rtx | |
2713 && GET_MODE (where) == GET_MODE (valreg)) | |
2714 valreg = where; | |
2715 } | |
2716 } | |
2717 | |
2718 /* Precompute all register parameters. It isn't safe to compute anything | |
2719 once we have started filling any specific hard regs. */ | |
2720 precompute_register_parameters (num_actuals, args, ®_parm_seen); | |
2721 | |
2722 if (CALL_EXPR_STATIC_CHAIN (exp)) | |
2723 static_chain_value = expand_normal (CALL_EXPR_STATIC_CHAIN (exp)); | |
2724 else | |
2725 static_chain_value = 0; | |
2726 | |
2727 #ifdef REG_PARM_STACK_SPACE | |
2728 /* Save the fixed argument area if it's part of the caller's frame and | |
2729 is clobbered by argument setup for this call. */ | |
2730 if (ACCUMULATE_OUTGOING_ARGS && pass) | |
2731 save_area = save_fixed_argument_area (reg_parm_stack_space, argblock, | |
2732 &low_to_save, &high_to_save); | |
2733 #endif | |
2734 | |
2735 /* Now store (and compute if necessary) all non-register parms. | |
2736 These come before register parms, since they can require block-moves, | |
2737 which could clobber the registers used for register parms. | |
2738 Parms which have partial registers are not stored here, | |
2739 but we do preallocate space here if they want that. */ | |
2740 | |
2741 for (i = 0; i < num_actuals; i++) | |
2742 { | |
2743 if (args[i].reg == 0 || args[i].pass_on_stack) | |
2744 { | |
2745 rtx before_arg = get_last_insn (); | |
2746 | |
2747 if (store_one_arg (&args[i], argblock, flags, | |
2748 adjusted_args_size.var != 0, | |
2749 reg_parm_stack_space) | |
2750 || (pass == 0 | |
2751 && check_sibcall_argument_overlap (before_arg, | |
2752 &args[i], 1))) | |
2753 sibcall_failure = 1; | |
2754 } | |
2755 | |
2756 if (((flags & ECF_CONST) | |
2757 || ((flags & ECF_PURE) && ACCUMULATE_OUTGOING_ARGS)) | |
2758 && args[i].stack) | |
2759 call_fusage = gen_rtx_EXPR_LIST (VOIDmode, | |
2760 gen_rtx_USE (VOIDmode, | |
2761 args[i].stack), | |
2762 call_fusage); | |
2763 } | |
2764 | |
2765 /* If we have a parm that is passed in registers but not in memory | |
2766 and whose alignment does not permit a direct copy into registers, | |
2767 make a group of pseudos that correspond to each register that we | |
2768 will later fill. */ | |
2769 if (STRICT_ALIGNMENT) | |
2770 store_unaligned_arguments_into_pseudos (args, num_actuals); | |
2771 | |
2772 /* Now store any partially-in-registers parm. | |
2773 This is the last place a block-move can happen. */ | |
2774 if (reg_parm_seen) | |
2775 for (i = 0; i < num_actuals; i++) | |
2776 if (args[i].partial != 0 && ! args[i].pass_on_stack) | |
2777 { | |
2778 rtx before_arg = get_last_insn (); | |
2779 | |
2780 if (store_one_arg (&args[i], argblock, flags, | |
2781 adjusted_args_size.var != 0, | |
2782 reg_parm_stack_space) | |
2783 || (pass == 0 | |
2784 && check_sibcall_argument_overlap (before_arg, | |
2785 &args[i], 1))) | |
2786 sibcall_failure = 1; | |
2787 } | |
2788 | |
2789 /* If we pushed args in forward order, perform stack alignment | |
2790 after pushing the last arg. */ | |
2791 if (!PUSH_ARGS_REVERSED && argblock == 0) | |
2792 anti_adjust_stack (GEN_INT (adjusted_args_size.constant | |
2793 - unadjusted_args_size)); | |
2794 | |
2795 /* If register arguments require space on the stack and stack space | |
2796 was not preallocated, allocate stack space here for arguments | |
2797 passed in registers. */ | |
2798 if (OUTGOING_REG_PARM_STACK_SPACE ((!fndecl ? fntype : TREE_TYPE (fndecl))) | |
2799 && !ACCUMULATE_OUTGOING_ARGS | |
2800 && must_preallocate == 0 && reg_parm_stack_space > 0) | |
2801 anti_adjust_stack (GEN_INT (reg_parm_stack_space)); | |
2802 | |
2803 /* Pass the function the address in which to return a | |
2804 structure value. */ | |
2805 if (pass != 0 && structure_value_addr && ! structure_value_addr_parm) | |
2806 { | |
2807 structure_value_addr | |
2808 = convert_memory_address (Pmode, structure_value_addr); | |
2809 emit_move_insn (struct_value, | |
2810 force_reg (Pmode, | |
2811 force_operand (structure_value_addr, | |
2812 NULL_RTX))); | |
2813 | |
2814 if (REG_P (struct_value)) | |
2815 use_reg (&call_fusage, struct_value); | |
2816 } | |
2817 | |
2818 after_args = get_last_insn (); | |
2819 funexp = prepare_call_address (funexp, static_chain_value, | |
2820 &call_fusage, reg_parm_seen, pass == 0); | |
2821 | |
2822 load_register_parameters (args, num_actuals, &call_fusage, flags, | |
2823 pass == 0, &sibcall_failure); | |
2824 | |
2825 /* Save a pointer to the last insn before the call, so that we can | |
2826 later safely search backwards to find the CALL_INSN. */ | |
2827 before_call = get_last_insn (); | |
2828 | |
2829 /* Set up next argument register. For sibling calls on machines | |
2830 with register windows this should be the incoming register. */ | |
2831 #ifdef FUNCTION_INCOMING_ARG | |
2832 if (pass == 0) | |
2833 next_arg_reg = FUNCTION_INCOMING_ARG (args_so_far, VOIDmode, | |
2834 void_type_node, 1); | |
2835 else | |
2836 #endif | |
2837 next_arg_reg = FUNCTION_ARG (args_so_far, VOIDmode, | |
2838 void_type_node, 1); | |
2839 | |
2840 /* All arguments and registers used for the call must be set up by | |
2841 now! */ | |
2842 | |
2843 /* Stack must be properly aligned now. */ | |
2844 gcc_assert (!pass | |
2845 || !(stack_pointer_delta % preferred_unit_stack_boundary)); | |
2846 | |
2847 /* Generate the actual call instruction. */ | |
2848 emit_call_1 (funexp, exp, fndecl, funtype, unadjusted_args_size, | |
2849 adjusted_args_size.constant, struct_value_size, | |
2850 next_arg_reg, valreg, old_inhibit_defer_pop, call_fusage, | |
2851 flags, & args_so_far); | |
2852 | |
2853 /* If the call setup or the call itself overlaps with anything | |
2854 of the argument setup we probably clobbered our call address. | |
2855 In that case we can't do sibcalls. */ | |
2856 if (pass == 0 | |
2857 && check_sibcall_argument_overlap (after_args, 0, 0)) | |
2858 sibcall_failure = 1; | |
2859 | |
2860 /* If a non-BLKmode value is returned at the most significant end | |
2861 of a register, shift the register right by the appropriate amount | |
2862 and update VALREG accordingly. BLKmode values are handled by the | |
2863 group load/store machinery below. */ | |
2864 if (!structure_value_addr | |
2865 && !pcc_struct_value | |
2866 && TYPE_MODE (TREE_TYPE (exp)) != BLKmode | |
2867 && targetm.calls.return_in_msb (TREE_TYPE (exp))) | |
2868 { | |
2869 if (shift_return_value (TYPE_MODE (TREE_TYPE (exp)), false, valreg)) | |
2870 sibcall_failure = 1; | |
2871 valreg = gen_rtx_REG (TYPE_MODE (TREE_TYPE (exp)), REGNO (valreg)); | |
2872 } | |
2873 | |
2874 if (pass && (flags & ECF_MALLOC)) | |
2875 { | |
2876 rtx temp = gen_reg_rtx (GET_MODE (valreg)); | |
2877 rtx last, insns; | |
2878 | |
2879 /* The return value from a malloc-like function is a pointer. */ | |
2880 if (TREE_CODE (TREE_TYPE (exp)) == POINTER_TYPE) | |
2881 mark_reg_pointer (temp, BIGGEST_ALIGNMENT); | |
2882 | |
2883 emit_move_insn (temp, valreg); | |
2884 | |
2885 /* The return value from a malloc-like function can not alias | |
2886 anything else. */ | |
2887 last = get_last_insn (); | |
2888 add_reg_note (last, REG_NOALIAS, temp); | |
2889 | |
2890 /* Write out the sequence. */ | |
2891 insns = get_insns (); | |
2892 end_sequence (); | |
2893 emit_insn (insns); | |
2894 valreg = temp; | |
2895 } | |
2896 | |
2897 /* For calls to `setjmp', etc., inform | |
2898 function.c:setjmp_warnings that it should complain if | |
2899 nonvolatile values are live. For functions that cannot | |
2900 return, inform flow that control does not fall through. */ | |
2901 | |
2902 if ((flags & ECF_NORETURN) || pass == 0) | |
2903 { | |
2904 /* The barrier must be emitted | |
2905 immediately after the CALL_INSN. Some ports emit more | |
2906 than just a CALL_INSN above, so we must search for it here. */ | |
2907 | |
2908 rtx last = get_last_insn (); | |
2909 while (!CALL_P (last)) | |
2910 { | |
2911 last = PREV_INSN (last); | |
2912 /* There was no CALL_INSN? */ | |
2913 gcc_assert (last != before_call); | |
2914 } | |
2915 | |
2916 emit_barrier_after (last); | |
2917 | |
2918 /* Stack adjustments after a noreturn call are dead code. | |
2919 However when NO_DEFER_POP is in effect, we must preserve | |
2920 stack_pointer_delta. */ | |
2921 if (inhibit_defer_pop == 0) | |
2922 { | |
2923 stack_pointer_delta = old_stack_allocated; | |
2924 pending_stack_adjust = 0; | |
2925 } | |
2926 } | |
2927 | |
2928 /* If value type not void, return an rtx for the value. */ | |
2929 | |
2930 if (TYPE_MODE (TREE_TYPE (exp)) == VOIDmode | |
2931 || ignore) | |
2932 target = const0_rtx; | |
2933 else if (structure_value_addr) | |
2934 { | |
2935 if (target == 0 || !MEM_P (target)) | |
2936 { | |
2937 target | |
2938 = gen_rtx_MEM (TYPE_MODE (TREE_TYPE (exp)), | |
2939 memory_address (TYPE_MODE (TREE_TYPE (exp)), | |
2940 structure_value_addr)); | |
2941 set_mem_attributes (target, exp, 1); | |
2942 } | |
2943 } | |
2944 else if (pcc_struct_value) | |
2945 { | |
2946 /* This is the special C++ case where we need to | |
2947 know what the true target was. We take care to | |
2948 never use this value more than once in one expression. */ | |
2949 target = gen_rtx_MEM (TYPE_MODE (TREE_TYPE (exp)), | |
2950 copy_to_reg (valreg)); | |
2951 set_mem_attributes (target, exp, 1); | |
2952 } | |
2953 /* Handle calls that return values in multiple non-contiguous locations. | |
2954 The Irix 6 ABI has examples of this. */ | |
2955 else if (GET_CODE (valreg) == PARALLEL) | |
2956 { | |
2957 if (target == 0) | |
2958 { | |
2959 /* This will only be assigned once, so it can be readonly. */ | |
2960 tree nt = build_qualified_type (TREE_TYPE (exp), | |
2961 (TYPE_QUALS (TREE_TYPE (exp)) | |
2962 | TYPE_QUAL_CONST)); | |
2963 | |
2964 target = assign_temp (nt, 0, 1, 1); | |
2965 } | |
2966 | |
2967 if (! rtx_equal_p (target, valreg)) | |
2968 emit_group_store (target, valreg, TREE_TYPE (exp), | |
2969 int_size_in_bytes (TREE_TYPE (exp))); | |
2970 | |
2971 /* We can not support sibling calls for this case. */ | |
2972 sibcall_failure = 1; | |
2973 } | |
2974 else if (target | |
2975 && GET_MODE (target) == TYPE_MODE (TREE_TYPE (exp)) | |
2976 && GET_MODE (target) == GET_MODE (valreg)) | |
2977 { | |
2978 bool may_overlap = false; | |
2979 | |
2980 /* We have to copy a return value in a CLASS_LIKELY_SPILLED hard | |
2981 reg to a plain register. */ | |
2982 if (!REG_P (target) || HARD_REGISTER_P (target)) | |
2983 valreg = avoid_likely_spilled_reg (valreg); | |
2984 | |
2985 /* If TARGET is a MEM in the argument area, and we have | |
2986 saved part of the argument area, then we can't store | |
2987 directly into TARGET as it may get overwritten when we | |
2988 restore the argument save area below. Don't work too | |
2989 hard though and simply force TARGET to a register if it | |
2990 is a MEM; the optimizer is quite likely to sort it out. */ | |
2991 if (ACCUMULATE_OUTGOING_ARGS && pass && MEM_P (target)) | |
2992 for (i = 0; i < num_actuals; i++) | |
2993 if (args[i].save_area) | |
2994 { | |
2995 may_overlap = true; | |
2996 break; | |
2997 } | |
2998 | |
2999 if (may_overlap) | |
3000 target = copy_to_reg (valreg); | |
3001 else | |
3002 { | |
3003 /* TARGET and VALREG cannot be equal at this point | |
3004 because the latter would not have | |
3005 REG_FUNCTION_VALUE_P true, while the former would if | |
3006 it were referring to the same register. | |
3007 | |
3008 If they refer to the same register, this move will be | |
3009 a no-op, except when function inlining is being | |
3010 done. */ | |
3011 emit_move_insn (target, valreg); | |
3012 | |
3013 /* If we are setting a MEM, this code must be executed. | |
3014 Since it is emitted after the call insn, sibcall | |
3015 optimization cannot be performed in that case. */ | |
3016 if (MEM_P (target)) | |
3017 sibcall_failure = 1; | |
3018 } | |
3019 } | |
3020 else if (TYPE_MODE (TREE_TYPE (exp)) == BLKmode) | |
3021 { | |
3022 target = copy_blkmode_from_reg (target, valreg, TREE_TYPE (exp)); | |
3023 | |
3024 /* We can not support sibling calls for this case. */ | |
3025 sibcall_failure = 1; | |
3026 } | |
3027 else | |
3028 target = copy_to_reg (avoid_likely_spilled_reg (valreg)); | |
3029 | |
3030 if (targetm.calls.promote_function_return(funtype)) | |
3031 { | |
3032 /* If we promoted this return value, make the proper SUBREG. | |
3033 TARGET might be const0_rtx here, so be careful. */ | |
3034 if (REG_P (target) | |
3035 && TYPE_MODE (TREE_TYPE (exp)) != BLKmode | |
3036 && GET_MODE (target) != TYPE_MODE (TREE_TYPE (exp))) | |
3037 { | |
3038 tree type = TREE_TYPE (exp); | |
3039 int unsignedp = TYPE_UNSIGNED (type); | |
3040 int offset = 0; | |
3041 enum machine_mode pmode; | |
3042 | |
3043 pmode = promote_mode (type, TYPE_MODE (type), &unsignedp, 1); | |
3044 /* If we don't promote as expected, something is wrong. */ | |
3045 gcc_assert (GET_MODE (target) == pmode); | |
3046 | |
3047 if ((WORDS_BIG_ENDIAN || BYTES_BIG_ENDIAN) | |
3048 && (GET_MODE_SIZE (GET_MODE (target)) | |
3049 > GET_MODE_SIZE (TYPE_MODE (type)))) | |
3050 { | |
3051 offset = GET_MODE_SIZE (GET_MODE (target)) | |
3052 - GET_MODE_SIZE (TYPE_MODE (type)); | |
3053 if (! BYTES_BIG_ENDIAN) | |
3054 offset = (offset / UNITS_PER_WORD) * UNITS_PER_WORD; | |
3055 else if (! WORDS_BIG_ENDIAN) | |
3056 offset %= UNITS_PER_WORD; | |
3057 } | |
3058 target = gen_rtx_SUBREG (TYPE_MODE (type), target, offset); | |
3059 SUBREG_PROMOTED_VAR_P (target) = 1; | |
3060 SUBREG_PROMOTED_UNSIGNED_SET (target, unsignedp); | |
3061 } | |
3062 } | |
3063 | |
3064 /* If size of args is variable or this was a constructor call for a stack | |
3065 argument, restore saved stack-pointer value. */ | |
3066 | |
3067 if (old_stack_level) | |
3068 { | |
3069 emit_stack_restore (SAVE_BLOCK, old_stack_level, NULL_RTX); | |
3070 stack_pointer_delta = old_stack_pointer_delta; | |
3071 pending_stack_adjust = old_pending_adj; | |
3072 old_stack_allocated = stack_pointer_delta - pending_stack_adjust; | |
3073 stack_arg_under_construction = old_stack_arg_under_construction; | |
3074 highest_outgoing_arg_in_use = initial_highest_arg_in_use; | |
3075 stack_usage_map = initial_stack_usage_map; | |
3076 sibcall_failure = 1; | |
3077 } | |
3078 else if (ACCUMULATE_OUTGOING_ARGS && pass) | |
3079 { | |
3080 #ifdef REG_PARM_STACK_SPACE | |
3081 if (save_area) | |
3082 restore_fixed_argument_area (save_area, argblock, | |
3083 high_to_save, low_to_save); | |
3084 #endif | |
3085 | |
3086 /* If we saved any argument areas, restore them. */ | |
3087 for (i = 0; i < num_actuals; i++) | |
3088 if (args[i].save_area) | |
3089 { | |
3090 enum machine_mode save_mode = GET_MODE (args[i].save_area); | |
3091 rtx stack_area | |
3092 = gen_rtx_MEM (save_mode, | |
3093 memory_address (save_mode, | |
3094 XEXP (args[i].stack_slot, 0))); | |
3095 | |
3096 if (save_mode != BLKmode) | |
3097 emit_move_insn (stack_area, args[i].save_area); | |
3098 else | |
3099 emit_block_move (stack_area, args[i].save_area, | |
3100 GEN_INT (args[i].locate.size.constant), | |
3101 BLOCK_OP_CALL_PARM); | |
3102 } | |
3103 | |
3104 highest_outgoing_arg_in_use = initial_highest_arg_in_use; | |
3105 stack_usage_map = initial_stack_usage_map; | |
3106 } | |
3107 | |
3108 /* If this was alloca, record the new stack level for nonlocal gotos. | |
3109 Check for the handler slots since we might not have a save area | |
3110 for non-local gotos. */ | |
3111 | |
3112 if ((flags & ECF_MAY_BE_ALLOCA) && cfun->nonlocal_goto_save_area != 0) | |
3113 update_nonlocal_goto_save_area (); | |
3114 | |
3115 /* Free up storage we no longer need. */ | |
3116 for (i = 0; i < num_actuals; ++i) | |
3117 if (args[i].aligned_regs) | |
3118 free (args[i].aligned_regs); | |
3119 | |
3120 insns = get_insns (); | |
3121 end_sequence (); | |
3122 | |
3123 if (pass == 0) | |
3124 { | |
3125 tail_call_insns = insns; | |
3126 | |
3127 /* Restore the pending stack adjustment now that we have | |
3128 finished generating the sibling call sequence. */ | |
3129 | |
3130 pending_stack_adjust = save_pending_stack_adjust; | |
3131 stack_pointer_delta = save_stack_pointer_delta; | |
3132 | |
3133 /* Prepare arg structure for next iteration. */ | |
3134 for (i = 0; i < num_actuals; i++) | |
3135 { | |
3136 args[i].value = 0; | |
3137 args[i].aligned_regs = 0; | |
3138 args[i].stack = 0; | |
3139 } | |
3140 | |
3141 sbitmap_free (stored_args_map); | |
3142 } | |
3143 else | |
3144 { | |
3145 normal_call_insns = insns; | |
3146 | |
3147 /* Verify that we've deallocated all the stack we used. */ | |
3148 gcc_assert ((flags & ECF_NORETURN) | |
3149 || (old_stack_allocated | |
3150 == stack_pointer_delta - pending_stack_adjust)); | |
3151 } | |
3152 | |
3153 /* If something prevents making this a sibling call, | |
3154 zero out the sequence. */ | |
3155 if (sibcall_failure) | |
3156 tail_call_insns = NULL_RTX; | |
3157 else | |
3158 break; | |
3159 } | |
3160 | |
3161 /* If tail call production succeeded, we need to remove REG_EQUIV notes on | |
3162 arguments too, as argument area is now clobbered by the call. */ | |
3163 if (tail_call_insns) | |
3164 { | |
3165 emit_insn (tail_call_insns); | |
3166 crtl->tail_call_emit = true; | |
3167 } | |
3168 else | |
3169 emit_insn (normal_call_insns); | |
3170 | |
3171 currently_expanding_call--; | |
3172 | |
3173 if (stack_usage_map_buf) | |
3174 free (stack_usage_map_buf); | |
3175 | |
3176 return target; | |
3177 } | |
3178 | |
3179 /* A sibling call sequence invalidates any REG_EQUIV notes made for | |
3180 this function's incoming arguments. | |
3181 | |
3182 At the start of RTL generation we know the only REG_EQUIV notes | |
3183 in the rtl chain are those for incoming arguments, so we can look | |
3184 for REG_EQUIV notes between the start of the function and the | |
3185 NOTE_INSN_FUNCTION_BEG. | |
3186 | |
3187 This is (slight) overkill. We could keep track of the highest | |
3188 argument we clobber and be more selective in removing notes, but it | |
3189 does not seem to be worth the effort. */ | |
3190 | |
3191 void | |
3192 fixup_tail_calls (void) | |
3193 { | |
3194 rtx insn; | |
3195 | |
3196 for (insn = get_insns (); insn; insn = NEXT_INSN (insn)) | |
3197 { | |
3198 rtx note; | |
3199 | |
3200 /* There are never REG_EQUIV notes for the incoming arguments | |
3201 after the NOTE_INSN_FUNCTION_BEG note, so stop if we see it. */ | |
3202 if (NOTE_P (insn) | |
3203 && NOTE_KIND (insn) == NOTE_INSN_FUNCTION_BEG) | |
3204 break; | |
3205 | |
3206 note = find_reg_note (insn, REG_EQUIV, 0); | |
3207 if (note) | |
3208 remove_note (insn, note); | |
3209 note = find_reg_note (insn, REG_EQUIV, 0); | |
3210 gcc_assert (!note); | |
3211 } | |
3212 } | |
3213 | |
3214 /* Traverse a list of TYPES and expand all complex types into their | |
3215 components. */ | |
3216 static tree | |
3217 split_complex_types (tree types) | |
3218 { | |
3219 tree p; | |
3220 | |
3221 /* Before allocating memory, check for the common case of no complex. */ | |
3222 for (p = types; p; p = TREE_CHAIN (p)) | |
3223 { | |
3224 tree type = TREE_VALUE (p); | |
3225 if (TREE_CODE (type) == COMPLEX_TYPE | |
3226 && targetm.calls.split_complex_arg (type)) | |
3227 goto found; | |
3228 } | |
3229 return types; | |
3230 | |
3231 found: | |
3232 types = copy_list (types); | |
3233 | |
3234 for (p = types; p; p = TREE_CHAIN (p)) | |
3235 { | |
3236 tree complex_type = TREE_VALUE (p); | |
3237 | |
3238 if (TREE_CODE (complex_type) == COMPLEX_TYPE | |
3239 && targetm.calls.split_complex_arg (complex_type)) | |
3240 { | |
3241 tree next, imag; | |
3242 | |
3243 /* Rewrite complex type with component type. */ | |
3244 TREE_VALUE (p) = TREE_TYPE (complex_type); | |
3245 next = TREE_CHAIN (p); | |
3246 | |
3247 /* Add another component type for the imaginary part. */ | |
3248 imag = build_tree_list (NULL_TREE, TREE_VALUE (p)); | |
3249 TREE_CHAIN (p) = imag; | |
3250 TREE_CHAIN (imag) = next; | |
3251 | |
3252 /* Skip the newly created node. */ | |
3253 p = TREE_CHAIN (p); | |
3254 } | |
3255 } | |
3256 | |
3257 return types; | |
3258 } | |
3259 | |
3260 /* Output a library call to function FUN (a SYMBOL_REF rtx). | |
3261 The RETVAL parameter specifies whether return value needs to be saved, other | |
3262 parameters are documented in the emit_library_call function below. */ | |
3263 | |
3264 static rtx | |
3265 emit_library_call_value_1 (int retval, rtx orgfun, rtx value, | |
3266 enum libcall_type fn_type, | |
3267 enum machine_mode outmode, int nargs, va_list p) | |
3268 { | |
3269 /* Total size in bytes of all the stack-parms scanned so far. */ | |
3270 struct args_size args_size; | |
3271 /* Size of arguments before any adjustments (such as rounding). */ | |
3272 struct args_size original_args_size; | |
3273 int argnum; | |
3274 rtx fun; | |
3275 /* Todo, choose the correct decl type of orgfun. Sadly this information | |
3276 isn't present here, so we default to native calling abi here. */ | |
3277 tree fndecl ATTRIBUTE_UNUSED = NULL_TREE; /* library calls default to host calling abi ? */ | |
3278 tree fntype ATTRIBUTE_UNUSED = NULL_TREE; /* library calls default to host calling abi ? */ | |
3279 int inc; | |
3280 int count; | |
3281 rtx argblock = 0; | |
3282 CUMULATIVE_ARGS args_so_far; | |
3283 struct arg | |
3284 { | |
3285 rtx value; | |
3286 enum machine_mode mode; | |
3287 rtx reg; | |
3288 int partial; | |
3289 struct locate_and_pad_arg_data locate; | |
3290 rtx save_area; | |
3291 }; | |
3292 struct arg *argvec; | |
3293 int old_inhibit_defer_pop = inhibit_defer_pop; | |
3294 rtx call_fusage = 0; | |
3295 rtx mem_value = 0; | |
3296 rtx valreg; | |
3297 int pcc_struct_value = 0; | |
3298 int struct_value_size = 0; | |
3299 int flags; | |
3300 int reg_parm_stack_space = 0; | |
3301 int needed; | |
3302 rtx before_call; | |
3303 tree tfom; /* type_for_mode (outmode, 0) */ | |
3304 | |
3305 #ifdef REG_PARM_STACK_SPACE | |
3306 /* Define the boundary of the register parm stack space that needs to be | |
3307 save, if any. */ | |
3308 int low_to_save = 0, high_to_save = 0; | |
3309 rtx save_area = 0; /* Place that it is saved. */ | |
3310 #endif | |
3311 | |
3312 /* Size of the stack reserved for parameter registers. */ | |
3313 int initial_highest_arg_in_use = highest_outgoing_arg_in_use; | |
3314 char *initial_stack_usage_map = stack_usage_map; | |
3315 char *stack_usage_map_buf = NULL; | |
3316 | |
3317 rtx struct_value = targetm.calls.struct_value_rtx (0, 0); | |
3318 | |
3319 #ifdef REG_PARM_STACK_SPACE | |
3320 reg_parm_stack_space = REG_PARM_STACK_SPACE ((tree) 0); | |
3321 #endif | |
3322 | |
3323 /* By default, library functions can not throw. */ | |
3324 flags = ECF_NOTHROW; | |
3325 | |
3326 switch (fn_type) | |
3327 { | |
3328 case LCT_NORMAL: | |
3329 break; | |
3330 case LCT_CONST: | |
3331 flags |= ECF_CONST; | |
3332 break; | |
3333 case LCT_PURE: | |
3334 flags |= ECF_PURE; | |
3335 break; | |
3336 case LCT_NORETURN: | |
3337 flags |= ECF_NORETURN; | |
3338 break; | |
3339 case LCT_THROW: | |
3340 flags = ECF_NORETURN; | |
3341 break; | |
3342 case LCT_RETURNS_TWICE: | |
3343 flags = ECF_RETURNS_TWICE; | |
3344 break; | |
3345 } | |
3346 fun = orgfun; | |
3347 | |
3348 /* Ensure current function's preferred stack boundary is at least | |
3349 what we need. */ | |
3350 if (crtl->preferred_stack_boundary < PREFERRED_STACK_BOUNDARY) | |
3351 crtl->preferred_stack_boundary = PREFERRED_STACK_BOUNDARY; | |
3352 | |
3353 /* If this kind of value comes back in memory, | |
3354 decide where in memory it should come back. */ | |
3355 if (outmode != VOIDmode) | |
3356 { | |
3357 tfom = lang_hooks.types.type_for_mode (outmode, 0); | |
3358 if (aggregate_value_p (tfom, 0)) | |
3359 { | |
3360 #ifdef PCC_STATIC_STRUCT_RETURN | |
3361 rtx pointer_reg | |
3362 = hard_function_value (build_pointer_type (tfom), 0, 0, 0); | |
3363 mem_value = gen_rtx_MEM (outmode, pointer_reg); | |
3364 pcc_struct_value = 1; | |
3365 if (value == 0) | |
3366 value = gen_reg_rtx (outmode); | |
3367 #else /* not PCC_STATIC_STRUCT_RETURN */ | |
3368 struct_value_size = GET_MODE_SIZE (outmode); | |
3369 if (value != 0 && MEM_P (value)) | |
3370 mem_value = value; | |
3371 else | |
3372 mem_value = assign_temp (tfom, 0, 1, 1); | |
3373 #endif | |
3374 /* This call returns a big structure. */ | |
3375 flags &= ~(ECF_CONST | ECF_PURE | ECF_LOOPING_CONST_OR_PURE); | |
3376 } | |
3377 } | |
3378 else | |
3379 tfom = void_type_node; | |
3380 | |
3381 /* ??? Unfinished: must pass the memory address as an argument. */ | |
3382 | |
3383 /* Copy all the libcall-arguments out of the varargs data | |
3384 and into a vector ARGVEC. | |
3385 | |
3386 Compute how to pass each argument. We only support a very small subset | |
3387 of the full argument passing conventions to limit complexity here since | |
3388 library functions shouldn't have many args. */ | |
3389 | |
3390 argvec = XALLOCAVEC (struct arg, nargs + 1); | |
3391 memset (argvec, 0, (nargs + 1) * sizeof (struct arg)); | |
3392 | |
3393 #ifdef INIT_CUMULATIVE_LIBCALL_ARGS | |
3394 INIT_CUMULATIVE_LIBCALL_ARGS (args_so_far, outmode, fun); | |
3395 #else | |
3396 INIT_CUMULATIVE_ARGS (args_so_far, NULL_TREE, fun, 0, nargs); | |
3397 #endif | |
3398 | |
3399 args_size.constant = 0; | |
3400 args_size.var = 0; | |
3401 | |
3402 count = 0; | |
3403 | |
3404 push_temp_slots (); | |
3405 | |
3406 /* If there's a structure value address to be passed, | |
3407 either pass it in the special place, or pass it as an extra argument. */ | |
3408 if (mem_value && struct_value == 0 && ! pcc_struct_value) | |
3409 { | |
3410 rtx addr = XEXP (mem_value, 0); | |
3411 | |
3412 nargs++; | |
3413 | |
3414 /* Make sure it is a reasonable operand for a move or push insn. */ | |
3415 if (!REG_P (addr) && !MEM_P (addr) | |
3416 && ! (CONSTANT_P (addr) && LEGITIMATE_CONSTANT_P (addr))) | |
3417 addr = force_operand (addr, NULL_RTX); | |
3418 | |
3419 argvec[count].value = addr; | |
3420 argvec[count].mode = Pmode; | |
3421 argvec[count].partial = 0; | |
3422 | |
3423 argvec[count].reg = FUNCTION_ARG (args_so_far, Pmode, NULL_TREE, 1); | |
3424 gcc_assert (targetm.calls.arg_partial_bytes (&args_so_far, Pmode, | |
3425 NULL_TREE, 1) == 0); | |
3426 | |
3427 locate_and_pad_parm (Pmode, NULL_TREE, | |
3428 #ifdef STACK_PARMS_IN_REG_PARM_AREA | |
3429 1, | |
3430 #else | |
3431 argvec[count].reg != 0, | |
3432 #endif | |
3433 0, NULL_TREE, &args_size, &argvec[count].locate); | |
3434 | |
3435 if (argvec[count].reg == 0 || argvec[count].partial != 0 | |
3436 || reg_parm_stack_space > 0) | |
3437 args_size.constant += argvec[count].locate.size.constant; | |
3438 | |
3439 FUNCTION_ARG_ADVANCE (args_so_far, Pmode, (tree) 0, 1); | |
3440 | |
3441 count++; | |
3442 } | |
3443 | |
3444 for (; count < nargs; count++) | |
3445 { | |
3446 rtx val = va_arg (p, rtx); | |
3447 enum machine_mode mode = va_arg (p, enum machine_mode); | |
3448 | |
3449 /* We cannot convert the arg value to the mode the library wants here; | |
3450 must do it earlier where we know the signedness of the arg. */ | |
3451 gcc_assert (mode != BLKmode | |
3452 && (GET_MODE (val) == mode || GET_MODE (val) == VOIDmode)); | |
3453 | |
3454 /* Make sure it is a reasonable operand for a move or push insn. */ | |
3455 if (!REG_P (val) && !MEM_P (val) | |
3456 && ! (CONSTANT_P (val) && LEGITIMATE_CONSTANT_P (val))) | |
3457 val = force_operand (val, NULL_RTX); | |
3458 | |
3459 if (pass_by_reference (&args_so_far, mode, NULL_TREE, 1)) | |
3460 { | |
3461 rtx slot; | |
3462 int must_copy | |
3463 = !reference_callee_copied (&args_so_far, mode, NULL_TREE, 1); | |
3464 | |
3465 /* If this was a CONST function, it is now PURE since it now | |
3466 reads memory. */ | |
3467 if (flags & ECF_CONST) | |
3468 { | |
3469 flags &= ~ECF_CONST; | |
3470 flags |= ECF_PURE; | |
3471 } | |
3472 | |
3473 if (MEM_P (val) && !must_copy) | |
3474 slot = val; | |
3475 else | |
3476 { | |
3477 slot = assign_temp (lang_hooks.types.type_for_mode (mode, 0), | |
3478 0, 1, 1); | |
3479 emit_move_insn (slot, val); | |
3480 } | |
3481 | |
3482 call_fusage = gen_rtx_EXPR_LIST (VOIDmode, | |
3483 gen_rtx_USE (VOIDmode, slot), | |
3484 call_fusage); | |
3485 if (must_copy) | |
3486 call_fusage = gen_rtx_EXPR_LIST (VOIDmode, | |
3487 gen_rtx_CLOBBER (VOIDmode, | |
3488 slot), | |
3489 call_fusage); | |
3490 | |
3491 mode = Pmode; | |
3492 val = force_operand (XEXP (slot, 0), NULL_RTX); | |
3493 } | |
3494 | |
3495 argvec[count].value = val; | |
3496 argvec[count].mode = mode; | |
3497 | |
3498 argvec[count].reg = FUNCTION_ARG (args_so_far, mode, NULL_TREE, 1); | |
3499 | |
3500 argvec[count].partial | |
3501 = targetm.calls.arg_partial_bytes (&args_so_far, mode, NULL_TREE, 1); | |
3502 | |
3503 locate_and_pad_parm (mode, NULL_TREE, | |
3504 #ifdef STACK_PARMS_IN_REG_PARM_AREA | |
3505 1, | |
3506 #else | |
3507 argvec[count].reg != 0, | |
3508 #endif | |
3509 argvec[count].partial, | |
3510 NULL_TREE, &args_size, &argvec[count].locate); | |
3511 | |
3512 gcc_assert (!argvec[count].locate.size.var); | |
3513 | |
3514 if (argvec[count].reg == 0 || argvec[count].partial != 0 | |
3515 || reg_parm_stack_space > 0) | |
3516 args_size.constant += argvec[count].locate.size.constant; | |
3517 | |
3518 FUNCTION_ARG_ADVANCE (args_so_far, mode, (tree) 0, 1); | |
3519 } | |
3520 | |
3521 /* If this machine requires an external definition for library | |
3522 functions, write one out. */ | |
3523 assemble_external_libcall (fun); | |
3524 | |
3525 original_args_size = args_size; | |
3526 args_size.constant = (((args_size.constant | |
3527 + stack_pointer_delta | |
3528 + STACK_BYTES - 1) | |
3529 / STACK_BYTES | |
3530 * STACK_BYTES) | |
3531 - stack_pointer_delta); | |
3532 | |
3533 args_size.constant = MAX (args_size.constant, | |
3534 reg_parm_stack_space); | |
3535 | |
3536 if (! OUTGOING_REG_PARM_STACK_SPACE ((!fndecl ? fntype : TREE_TYPE (fndecl)))) | |
3537 args_size.constant -= reg_parm_stack_space; | |
3538 | |
3539 if (args_size.constant > crtl->outgoing_args_size) | |
3540 crtl->outgoing_args_size = args_size.constant; | |
3541 | |
3542 if (ACCUMULATE_OUTGOING_ARGS) | |
3543 { | |
3544 /* Since the stack pointer will never be pushed, it is possible for | |
3545 the evaluation of a parm to clobber something we have already | |
3546 written to the stack. Since most function calls on RISC machines | |
3547 do not use the stack, this is uncommon, but must work correctly. | |
3548 | |
3549 Therefore, we save any area of the stack that was already written | |
3550 and that we are using. Here we set up to do this by making a new | |
3551 stack usage map from the old one. | |
3552 | |
3553 Another approach might be to try to reorder the argument | |
3554 evaluations to avoid this conflicting stack usage. */ | |
3555 | |
3556 needed = args_size.constant; | |
3557 | |
3558 /* Since we will be writing into the entire argument area, the | |
3559 map must be allocated for its entire size, not just the part that | |
3560 is the responsibility of the caller. */ | |
3561 if (! OUTGOING_REG_PARM_STACK_SPACE ((!fndecl ? fntype : TREE_TYPE (fndecl)))) | |
3562 needed += reg_parm_stack_space; | |
3563 | |
3564 #ifdef ARGS_GROW_DOWNWARD | |
3565 highest_outgoing_arg_in_use = MAX (initial_highest_arg_in_use, | |
3566 needed + 1); | |
3567 #else | |
3568 highest_outgoing_arg_in_use = MAX (initial_highest_arg_in_use, | |
3569 needed); | |
3570 #endif | |
3571 stack_usage_map_buf = XNEWVEC (char, highest_outgoing_arg_in_use); | |
3572 stack_usage_map = stack_usage_map_buf; | |
3573 | |
3574 if (initial_highest_arg_in_use) | |
3575 memcpy (stack_usage_map, initial_stack_usage_map, | |
3576 initial_highest_arg_in_use); | |
3577 | |
3578 if (initial_highest_arg_in_use != highest_outgoing_arg_in_use) | |
3579 memset (&stack_usage_map[initial_highest_arg_in_use], 0, | |
3580 highest_outgoing_arg_in_use - initial_highest_arg_in_use); | |
3581 needed = 0; | |
3582 | |
3583 /* We must be careful to use virtual regs before they're instantiated, | |
3584 and real regs afterwards. Loop optimization, for example, can create | |
3585 new libcalls after we've instantiated the virtual regs, and if we | |
3586 use virtuals anyway, they won't match the rtl patterns. */ | |
3587 | |
3588 if (virtuals_instantiated) | |
3589 argblock = plus_constant (stack_pointer_rtx, STACK_POINTER_OFFSET); | |
3590 else | |
3591 argblock = virtual_outgoing_args_rtx; | |
3592 } | |
3593 else | |
3594 { | |
3595 if (!PUSH_ARGS) | |
3596 argblock = push_block (GEN_INT (args_size.constant), 0, 0); | |
3597 } | |
3598 | |
3599 /* If we push args individually in reverse order, perform stack alignment | |
3600 before the first push (the last arg). */ | |
3601 if (argblock == 0 && PUSH_ARGS_REVERSED) | |
3602 anti_adjust_stack (GEN_INT (args_size.constant | |
3603 - original_args_size.constant)); | |
3604 | |
3605 if (PUSH_ARGS_REVERSED) | |
3606 { | |
3607 inc = -1; | |
3608 argnum = nargs - 1; | |
3609 } | |
3610 else | |
3611 { | |
3612 inc = 1; | |
3613 argnum = 0; | |
3614 } | |
3615 | |
3616 #ifdef REG_PARM_STACK_SPACE | |
3617 if (ACCUMULATE_OUTGOING_ARGS) | |
3618 { | |
3619 /* The argument list is the property of the called routine and it | |
3620 may clobber it. If the fixed area has been used for previous | |
3621 parameters, we must save and restore it. */ | |
3622 save_area = save_fixed_argument_area (reg_parm_stack_space, argblock, | |
3623 &low_to_save, &high_to_save); | |
3624 } | |
3625 #endif | |
3626 | |
3627 /* Push the args that need to be pushed. */ | |
3628 | |
3629 /* ARGNUM indexes the ARGVEC array in the order in which the arguments | |
3630 are to be pushed. */ | |
3631 for (count = 0; count < nargs; count++, argnum += inc) | |
3632 { | |
3633 enum machine_mode mode = argvec[argnum].mode; | |
3634 rtx val = argvec[argnum].value; | |
3635 rtx reg = argvec[argnum].reg; | |
3636 int partial = argvec[argnum].partial; | |
3637 int lower_bound = 0, upper_bound = 0, i; | |
3638 | |
3639 if (! (reg != 0 && partial == 0)) | |
3640 { | |
3641 if (ACCUMULATE_OUTGOING_ARGS) | |
3642 { | |
3643 /* If this is being stored into a pre-allocated, fixed-size, | |
3644 stack area, save any previous data at that location. */ | |
3645 | |
3646 #ifdef ARGS_GROW_DOWNWARD | |
3647 /* stack_slot is negative, but we want to index stack_usage_map | |
3648 with positive values. */ | |
3649 upper_bound = -argvec[argnum].locate.slot_offset.constant + 1; | |
3650 lower_bound = upper_bound - argvec[argnum].locate.size.constant; | |
3651 #else | |
3652 lower_bound = argvec[argnum].locate.slot_offset.constant; | |
3653 upper_bound = lower_bound + argvec[argnum].locate.size.constant; | |
3654 #endif | |
3655 | |
3656 i = lower_bound; | |
3657 /* Don't worry about things in the fixed argument area; | |
3658 it has already been saved. */ | |
3659 if (i < reg_parm_stack_space) | |
3660 i = reg_parm_stack_space; | |
3661 while (i < upper_bound && stack_usage_map[i] == 0) | |
3662 i++; | |
3663 | |
3664 if (i < upper_bound) | |
3665 { | |
3666 /* We need to make a save area. */ | |
3667 unsigned int size | |
3668 = argvec[argnum].locate.size.constant * BITS_PER_UNIT; | |
3669 enum machine_mode save_mode | |
3670 = mode_for_size (size, MODE_INT, 1); | |
3671 rtx adr | |
3672 = plus_constant (argblock, | |
3673 argvec[argnum].locate.offset.constant); | |
3674 rtx stack_area | |
3675 = gen_rtx_MEM (save_mode, memory_address (save_mode, adr)); | |
3676 | |
3677 if (save_mode == BLKmode) | |
3678 { | |
3679 argvec[argnum].save_area | |
3680 = assign_stack_temp (BLKmode, | |
3681 argvec[argnum].locate.size.constant, | |
3682 0); | |
3683 | |
3684 emit_block_move (validize_mem (argvec[argnum].save_area), | |
3685 stack_area, | |
3686 GEN_INT (argvec[argnum].locate.size.constant), | |
3687 BLOCK_OP_CALL_PARM); | |
3688 } | |
3689 else | |
3690 { | |
3691 argvec[argnum].save_area = gen_reg_rtx (save_mode); | |
3692 | |
3693 emit_move_insn (argvec[argnum].save_area, stack_area); | |
3694 } | |
3695 } | |
3696 } | |
3697 | |
3698 emit_push_insn (val, mode, NULL_TREE, NULL_RTX, PARM_BOUNDARY, | |
3699 partial, reg, 0, argblock, | |
3700 GEN_INT (argvec[argnum].locate.offset.constant), | |
3701 reg_parm_stack_space, | |
3702 ARGS_SIZE_RTX (argvec[argnum].locate.alignment_pad)); | |
3703 | |
3704 /* Now mark the segment we just used. */ | |
3705 if (ACCUMULATE_OUTGOING_ARGS) | |
3706 for (i = lower_bound; i < upper_bound; i++) | |
3707 stack_usage_map[i] = 1; | |
3708 | |
3709 NO_DEFER_POP; | |
3710 | |
3711 if ((flags & ECF_CONST) | |
3712 || ((flags & ECF_PURE) && ACCUMULATE_OUTGOING_ARGS)) | |
3713 { | |
3714 rtx use; | |
3715 | |
3716 /* Indicate argument access so that alias.c knows that these | |
3717 values are live. */ | |
3718 if (argblock) | |
3719 use = plus_constant (argblock, | |
3720 argvec[argnum].locate.offset.constant); | |
3721 else | |
3722 /* When arguments are pushed, trying to tell alias.c where | |
3723 exactly this argument is won't work, because the | |
3724 auto-increment causes confusion. So we merely indicate | |
3725 that we access something with a known mode somewhere on | |
3726 the stack. */ | |
3727 use = gen_rtx_PLUS (Pmode, virtual_outgoing_args_rtx, | |
3728 gen_rtx_SCRATCH (Pmode)); | |
3729 use = gen_rtx_MEM (argvec[argnum].mode, use); | |
3730 use = gen_rtx_USE (VOIDmode, use); | |
3731 call_fusage = gen_rtx_EXPR_LIST (VOIDmode, use, call_fusage); | |
3732 } | |
3733 } | |
3734 } | |
3735 | |
3736 /* If we pushed args in forward order, perform stack alignment | |
3737 after pushing the last arg. */ | |
3738 if (argblock == 0 && !PUSH_ARGS_REVERSED) | |
3739 anti_adjust_stack (GEN_INT (args_size.constant | |
3740 - original_args_size.constant)); | |
3741 | |
3742 if (PUSH_ARGS_REVERSED) | |
3743 argnum = nargs - 1; | |
3744 else | |
3745 argnum = 0; | |
3746 | |
3747 fun = prepare_call_address (fun, NULL, &call_fusage, 0, 0); | |
3748 | |
3749 /* Now load any reg parms into their regs. */ | |
3750 | |
3751 /* ARGNUM indexes the ARGVEC array in the order in which the arguments | |
3752 are to be pushed. */ | |
3753 for (count = 0; count < nargs; count++, argnum += inc) | |
3754 { | |
3755 enum machine_mode mode = argvec[argnum].mode; | |
3756 rtx val = argvec[argnum].value; | |
3757 rtx reg = argvec[argnum].reg; | |
3758 int partial = argvec[argnum].partial; | |
3759 | |
3760 /* Handle calls that pass values in multiple non-contiguous | |
3761 locations. The PA64 has examples of this for library calls. */ | |
3762 if (reg != 0 && GET_CODE (reg) == PARALLEL) | |
3763 emit_group_load (reg, val, NULL_TREE, GET_MODE_SIZE (mode)); | |
3764 else if (reg != 0 && partial == 0) | |
3765 emit_move_insn (reg, val); | |
3766 | |
3767 NO_DEFER_POP; | |
3768 } | |
3769 | |
3770 /* Any regs containing parms remain in use through the call. */ | |
3771 for (count = 0; count < nargs; count++) | |
3772 { | |
3773 rtx reg = argvec[count].reg; | |
3774 if (reg != 0 && GET_CODE (reg) == PARALLEL) | |
3775 use_group_regs (&call_fusage, reg); | |
3776 else if (reg != 0) | |
3777 { | |
3778 int partial = argvec[count].partial; | |
3779 if (partial) | |
3780 { | |
3781 int nregs; | |
3782 gcc_assert (partial % UNITS_PER_WORD == 0); | |
3783 nregs = partial / UNITS_PER_WORD; | |
3784 use_regs (&call_fusage, REGNO (reg), nregs); | |
3785 } | |
3786 else | |
3787 use_reg (&call_fusage, reg); | |
3788 } | |
3789 } | |
3790 | |
3791 /* Pass the function the address in which to return a structure value. */ | |
3792 if (mem_value != 0 && struct_value != 0 && ! pcc_struct_value) | |
3793 { | |
3794 emit_move_insn (struct_value, | |
3795 force_reg (Pmode, | |
3796 force_operand (XEXP (mem_value, 0), | |
3797 NULL_RTX))); | |
3798 if (REG_P (struct_value)) | |
3799 use_reg (&call_fusage, struct_value); | |
3800 } | |
3801 | |
3802 /* Don't allow popping to be deferred, since then | |
3803 cse'ing of library calls could delete a call and leave the pop. */ | |
3804 NO_DEFER_POP; | |
3805 valreg = (mem_value == 0 && outmode != VOIDmode | |
3806 ? hard_libcall_value (outmode) : NULL_RTX); | |
3807 | |
3808 /* Stack must be properly aligned now. */ | |
3809 gcc_assert (!(stack_pointer_delta | |
3810 & (PREFERRED_STACK_BOUNDARY / BITS_PER_UNIT - 1))); | |
3811 | |
3812 before_call = get_last_insn (); | |
3813 | |
3814 /* We pass the old value of inhibit_defer_pop + 1 to emit_call_1, which | |
3815 will set inhibit_defer_pop to that value. */ | |
3816 /* The return type is needed to decide how many bytes the function pops. | |
3817 Signedness plays no role in that, so for simplicity, we pretend it's | |
3818 always signed. We also assume that the list of arguments passed has | |
3819 no impact, so we pretend it is unknown. */ | |
3820 | |
3821 emit_call_1 (fun, NULL, | |
3822 get_identifier (XSTR (orgfun, 0)), | |
3823 build_function_type (tfom, NULL_TREE), | |
3824 original_args_size.constant, args_size.constant, | |
3825 struct_value_size, | |
3826 FUNCTION_ARG (args_so_far, VOIDmode, void_type_node, 1), | |
3827 valreg, | |
3828 old_inhibit_defer_pop + 1, call_fusage, flags, & args_so_far); | |
3829 | |
3830 /* For calls to `setjmp', etc., inform function.c:setjmp_warnings | |
3831 that it should complain if nonvolatile values are live. For | |
3832 functions that cannot return, inform flow that control does not | |
3833 fall through. */ | |
3834 | |
3835 if (flags & ECF_NORETURN) | |
3836 { | |
3837 /* The barrier note must be emitted | |
3838 immediately after the CALL_INSN. Some ports emit more than | |
3839 just a CALL_INSN above, so we must search for it here. */ | |
3840 | |
3841 rtx last = get_last_insn (); | |
3842 while (!CALL_P (last)) | |
3843 { | |
3844 last = PREV_INSN (last); | |
3845 /* There was no CALL_INSN? */ | |
3846 gcc_assert (last != before_call); | |
3847 } | |
3848 | |
3849 emit_barrier_after (last); | |
3850 } | |
3851 | |
3852 /* Now restore inhibit_defer_pop to its actual original value. */ | |
3853 OK_DEFER_POP; | |
3854 | |
3855 pop_temp_slots (); | |
3856 | |
3857 /* Copy the value to the right place. */ | |
3858 if (outmode != VOIDmode && retval) | |
3859 { | |
3860 if (mem_value) | |
3861 { | |
3862 if (value == 0) | |
3863 value = mem_value; | |
3864 if (value != mem_value) | |
3865 emit_move_insn (value, mem_value); | |
3866 } | |
3867 else if (GET_CODE (valreg) == PARALLEL) | |
3868 { | |
3869 if (value == 0) | |
3870 value = gen_reg_rtx (outmode); | |
3871 emit_group_store (value, valreg, NULL_TREE, GET_MODE_SIZE (outmode)); | |
3872 } | |
3873 else | |
3874 { | |
3875 /* Convert to the proper mode if PROMOTE_MODE has been active. */ | |
3876 if (GET_MODE (valreg) != outmode) | |
3877 { | |
3878 int unsignedp = TYPE_UNSIGNED (tfom); | |
3879 | |
3880 gcc_assert (targetm.calls.promote_function_return (tfom)); | |
3881 gcc_assert (promote_mode (tfom, outmode, &unsignedp, 0) | |
3882 == GET_MODE (valreg)); | |
3883 | |
3884 valreg = convert_modes (outmode, GET_MODE (valreg), valreg, 0); | |
3885 } | |
3886 | |
3887 if (value != 0) | |
3888 emit_move_insn (value, valreg); | |
3889 else | |
3890 value = valreg; | |
3891 } | |
3892 } | |
3893 | |
3894 if (ACCUMULATE_OUTGOING_ARGS) | |
3895 { | |
3896 #ifdef REG_PARM_STACK_SPACE | |
3897 if (save_area) | |
3898 restore_fixed_argument_area (save_area, argblock, | |
3899 high_to_save, low_to_save); | |
3900 #endif | |
3901 | |
3902 /* If we saved any argument areas, restore them. */ | |
3903 for (count = 0; count < nargs; count++) | |
3904 if (argvec[count].save_area) | |
3905 { | |
3906 enum machine_mode save_mode = GET_MODE (argvec[count].save_area); | |
3907 rtx adr = plus_constant (argblock, | |
3908 argvec[count].locate.offset.constant); | |
3909 rtx stack_area = gen_rtx_MEM (save_mode, | |
3910 memory_address (save_mode, adr)); | |
3911 | |
3912 if (save_mode == BLKmode) | |
3913 emit_block_move (stack_area, | |
3914 validize_mem (argvec[count].save_area), | |
3915 GEN_INT (argvec[count].locate.size.constant), | |
3916 BLOCK_OP_CALL_PARM); | |
3917 else | |
3918 emit_move_insn (stack_area, argvec[count].save_area); | |
3919 } | |
3920 | |
3921 highest_outgoing_arg_in_use = initial_highest_arg_in_use; | |
3922 stack_usage_map = initial_stack_usage_map; | |
3923 } | |
3924 | |
3925 if (stack_usage_map_buf) | |
3926 free (stack_usage_map_buf); | |
3927 | |
3928 return value; | |
3929 | |
3930 } | |
3931 | |
3932 /* Output a library call to function FUN (a SYMBOL_REF rtx) | |
3933 (emitting the queue unless NO_QUEUE is nonzero), | |
3934 for a value of mode OUTMODE, | |
3935 with NARGS different arguments, passed as alternating rtx values | |
3936 and machine_modes to convert them to. | |
3937 | |
3938 FN_TYPE should be LCT_NORMAL for `normal' calls, LCT_CONST for | |
3939 `const' calls, LCT_PURE for `pure' calls, or other LCT_ value for | |
3940 other types of library calls. */ | |
3941 | |
3942 void | |
3943 emit_library_call (rtx orgfun, enum libcall_type fn_type, | |
3944 enum machine_mode outmode, int nargs, ...) | |
3945 { | |
3946 va_list p; | |
3947 | |
3948 va_start (p, nargs); | |
3949 emit_library_call_value_1 (0, orgfun, NULL_RTX, fn_type, outmode, nargs, p); | |
3950 va_end (p); | |
3951 } | |
3952 | |
3953 /* Like emit_library_call except that an extra argument, VALUE, | |
3954 comes second and says where to store the result. | |
3955 (If VALUE is zero, this function chooses a convenient way | |
3956 to return the value. | |
3957 | |
3958 This function returns an rtx for where the value is to be found. | |
3959 If VALUE is nonzero, VALUE is returned. */ | |
3960 | |
3961 rtx | |
3962 emit_library_call_value (rtx orgfun, rtx value, | |
3963 enum libcall_type fn_type, | |
3964 enum machine_mode outmode, int nargs, ...) | |
3965 { | |
3966 rtx result; | |
3967 va_list p; | |
3968 | |
3969 va_start (p, nargs); | |
3970 result = emit_library_call_value_1 (1, orgfun, value, fn_type, outmode, | |
3971 nargs, p); | |
3972 va_end (p); | |
3973 | |
3974 return result; | |
3975 } | |
3976 | |
3977 /* Store a single argument for a function call | |
3978 into the register or memory area where it must be passed. | |
3979 *ARG describes the argument value and where to pass it. | |
3980 | |
3981 ARGBLOCK is the address of the stack-block for all the arguments, | |
3982 or 0 on a machine where arguments are pushed individually. | |
3983 | |
3984 MAY_BE_ALLOCA nonzero says this could be a call to `alloca' | |
3985 so must be careful about how the stack is used. | |
3986 | |
3987 VARIABLE_SIZE nonzero says that this was a variable-sized outgoing | |
3988 argument stack. This is used if ACCUMULATE_OUTGOING_ARGS to indicate | |
3989 that we need not worry about saving and restoring the stack. | |
3990 | |
3991 FNDECL is the declaration of the function we are calling. | |
3992 | |
3993 Return nonzero if this arg should cause sibcall failure, | |
3994 zero otherwise. */ | |
3995 | |
3996 static int | |
3997 store_one_arg (struct arg_data *arg, rtx argblock, int flags, | |
3998 int variable_size ATTRIBUTE_UNUSED, int reg_parm_stack_space) | |
3999 { | |
4000 tree pval = arg->tree_value; | |
4001 rtx reg = 0; | |
4002 int partial = 0; | |
4003 int used = 0; | |
4004 int i, lower_bound = 0, upper_bound = 0; | |
4005 int sibcall_failure = 0; | |
4006 | |
4007 if (TREE_CODE (pval) == ERROR_MARK) | |
4008 return 1; | |
4009 | |
4010 /* Push a new temporary level for any temporaries we make for | |
4011 this argument. */ | |
4012 push_temp_slots (); | |
4013 | |
4014 if (ACCUMULATE_OUTGOING_ARGS && !(flags & ECF_SIBCALL)) | |
4015 { | |
4016 /* If this is being stored into a pre-allocated, fixed-size, stack area, | |
4017 save any previous data at that location. */ | |
4018 if (argblock && ! variable_size && arg->stack) | |
4019 { | |
4020 #ifdef ARGS_GROW_DOWNWARD | |
4021 /* stack_slot is negative, but we want to index stack_usage_map | |
4022 with positive values. */ | |
4023 if (GET_CODE (XEXP (arg->stack_slot, 0)) == PLUS) | |
4024 upper_bound = -INTVAL (XEXP (XEXP (arg->stack_slot, 0), 1)) + 1; | |
4025 else | |
4026 upper_bound = 0; | |
4027 | |
4028 lower_bound = upper_bound - arg->locate.size.constant; | |
4029 #else | |
4030 if (GET_CODE (XEXP (arg->stack_slot, 0)) == PLUS) | |
4031 lower_bound = INTVAL (XEXP (XEXP (arg->stack_slot, 0), 1)); | |
4032 else | |
4033 lower_bound = 0; | |
4034 | |
4035 upper_bound = lower_bound + arg->locate.size.constant; | |
4036 #endif | |
4037 | |
4038 i = lower_bound; | |
4039 /* Don't worry about things in the fixed argument area; | |
4040 it has already been saved. */ | |
4041 if (i < reg_parm_stack_space) | |
4042 i = reg_parm_stack_space; | |
4043 while (i < upper_bound && stack_usage_map[i] == 0) | |
4044 i++; | |
4045 | |
4046 if (i < upper_bound) | |
4047 { | |
4048 /* We need to make a save area. */ | |
4049 unsigned int size = arg->locate.size.constant * BITS_PER_UNIT; | |
4050 enum machine_mode save_mode = mode_for_size (size, MODE_INT, 1); | |
4051 rtx adr = memory_address (save_mode, XEXP (arg->stack_slot, 0)); | |
4052 rtx stack_area = gen_rtx_MEM (save_mode, adr); | |
4053 | |
4054 if (save_mode == BLKmode) | |
4055 { | |
4056 tree ot = TREE_TYPE (arg->tree_value); | |
4057 tree nt = build_qualified_type (ot, (TYPE_QUALS (ot) | |
4058 | TYPE_QUAL_CONST)); | |
4059 | |
4060 arg->save_area = assign_temp (nt, 0, 1, 1); | |
4061 preserve_temp_slots (arg->save_area); | |
4062 emit_block_move (validize_mem (arg->save_area), stack_area, | |
4063 GEN_INT (arg->locate.size.constant), | |
4064 BLOCK_OP_CALL_PARM); | |
4065 } | |
4066 else | |
4067 { | |
4068 arg->save_area = gen_reg_rtx (save_mode); | |
4069 emit_move_insn (arg->save_area, stack_area); | |
4070 } | |
4071 } | |
4072 } | |
4073 } | |
4074 | |
4075 /* If this isn't going to be placed on both the stack and in registers, | |
4076 set up the register and number of words. */ | |
4077 if (! arg->pass_on_stack) | |
4078 { | |
4079 if (flags & ECF_SIBCALL) | |
4080 reg = arg->tail_call_reg; | |
4081 else | |
4082 reg = arg->reg; | |
4083 partial = arg->partial; | |
4084 } | |
4085 | |
4086 /* Being passed entirely in a register. We shouldn't be called in | |
4087 this case. */ | |
4088 gcc_assert (reg == 0 || partial != 0); | |
4089 | |
4090 /* If this arg needs special alignment, don't load the registers | |
4091 here. */ | |
4092 if (arg->n_aligned_regs != 0) | |
4093 reg = 0; | |
4094 | |
4095 /* If this is being passed partially in a register, we can't evaluate | |
4096 it directly into its stack slot. Otherwise, we can. */ | |
4097 if (arg->value == 0) | |
4098 { | |
4099 /* stack_arg_under_construction is nonzero if a function argument is | |
4100 being evaluated directly into the outgoing argument list and | |
4101 expand_call must take special action to preserve the argument list | |
4102 if it is called recursively. | |
4103 | |
4104 For scalar function arguments stack_usage_map is sufficient to | |
4105 determine which stack slots must be saved and restored. Scalar | |
4106 arguments in general have pass_on_stack == 0. | |
4107 | |
4108 If this argument is initialized by a function which takes the | |
4109 address of the argument (a C++ constructor or a C function | |
4110 returning a BLKmode structure), then stack_usage_map is | |
4111 insufficient and expand_call must push the stack around the | |
4112 function call. Such arguments have pass_on_stack == 1. | |
4113 | |
4114 Note that it is always safe to set stack_arg_under_construction, | |
4115 but this generates suboptimal code if set when not needed. */ | |
4116 | |
4117 if (arg->pass_on_stack) | |
4118 stack_arg_under_construction++; | |
4119 | |
4120 arg->value = expand_expr (pval, | |
4121 (partial | |
4122 || TYPE_MODE (TREE_TYPE (pval)) != arg->mode) | |
4123 ? NULL_RTX : arg->stack, | |
4124 VOIDmode, EXPAND_STACK_PARM); | |
4125 | |
4126 /* If we are promoting object (or for any other reason) the mode | |
4127 doesn't agree, convert the mode. */ | |
4128 | |
4129 if (arg->mode != TYPE_MODE (TREE_TYPE (pval))) | |
4130 arg->value = convert_modes (arg->mode, TYPE_MODE (TREE_TYPE (pval)), | |
4131 arg->value, arg->unsignedp); | |
4132 | |
4133 if (arg->pass_on_stack) | |
4134 stack_arg_under_construction--; | |
4135 } | |
4136 | |
4137 /* Check for overlap with already clobbered argument area. */ | |
4138 if ((flags & ECF_SIBCALL) | |
4139 && MEM_P (arg->value) | |
4140 && mem_overlaps_already_clobbered_arg_p (XEXP (arg->value, 0), | |
4141 arg->locate.size.constant)) | |
4142 sibcall_failure = 1; | |
4143 | |
4144 /* Don't allow anything left on stack from computation | |
4145 of argument to alloca. */ | |
4146 if (flags & ECF_MAY_BE_ALLOCA) | |
4147 do_pending_stack_adjust (); | |
4148 | |
4149 if (arg->value == arg->stack) | |
4150 /* If the value is already in the stack slot, we are done. */ | |
4151 ; | |
4152 else if (arg->mode != BLKmode) | |
4153 { | |
4154 int size; | |
4155 unsigned int parm_align; | |
4156 | |
4157 /* Argument is a scalar, not entirely passed in registers. | |
4158 (If part is passed in registers, arg->partial says how much | |
4159 and emit_push_insn will take care of putting it there.) | |
4160 | |
4161 Push it, and if its size is less than the | |
4162 amount of space allocated to it, | |
4163 also bump stack pointer by the additional space. | |
4164 Note that in C the default argument promotions | |
4165 will prevent such mismatches. */ | |
4166 | |
4167 size = GET_MODE_SIZE (arg->mode); | |
4168 /* Compute how much space the push instruction will push. | |
4169 On many machines, pushing a byte will advance the stack | |
4170 pointer by a halfword. */ | |
4171 #ifdef PUSH_ROUNDING | |
4172 size = PUSH_ROUNDING (size); | |
4173 #endif | |
4174 used = size; | |
4175 | |
4176 /* Compute how much space the argument should get: | |
4177 round up to a multiple of the alignment for arguments. */ | |
4178 if (none != FUNCTION_ARG_PADDING (arg->mode, TREE_TYPE (pval))) | |
4179 used = (((size + PARM_BOUNDARY / BITS_PER_UNIT - 1) | |
4180 / (PARM_BOUNDARY / BITS_PER_UNIT)) | |
4181 * (PARM_BOUNDARY / BITS_PER_UNIT)); | |
4182 | |
4183 /* Compute the alignment of the pushed argument. */ | |
4184 parm_align = arg->locate.boundary; | |
4185 if (FUNCTION_ARG_PADDING (arg->mode, TREE_TYPE (pval)) == downward) | |
4186 { | |
4187 int pad = used - size; | |
4188 if (pad) | |
4189 { | |
4190 unsigned int pad_align = (pad & -pad) * BITS_PER_UNIT; | |
4191 parm_align = MIN (parm_align, pad_align); | |
4192 } | |
4193 } | |
4194 | |
4195 /* This isn't already where we want it on the stack, so put it there. | |
4196 This can either be done with push or copy insns. */ | |
4197 emit_push_insn (arg->value, arg->mode, TREE_TYPE (pval), NULL_RTX, | |
4198 parm_align, partial, reg, used - size, argblock, | |
4199 ARGS_SIZE_RTX (arg->locate.offset), reg_parm_stack_space, | |
4200 ARGS_SIZE_RTX (arg->locate.alignment_pad)); | |
4201 | |
4202 /* Unless this is a partially-in-register argument, the argument is now | |
4203 in the stack. */ | |
4204 if (partial == 0) | |
4205 arg->value = arg->stack; | |
4206 } | |
4207 else | |
4208 { | |
4209 /* BLKmode, at least partly to be pushed. */ | |
4210 | |
4211 unsigned int parm_align; | |
4212 int excess; | |
4213 rtx size_rtx; | |
4214 | |
4215 /* Pushing a nonscalar. | |
4216 If part is passed in registers, PARTIAL says how much | |
4217 and emit_push_insn will take care of putting it there. */ | |
4218 | |
4219 /* Round its size up to a multiple | |
4220 of the allocation unit for arguments. */ | |
4221 | |
4222 if (arg->locate.size.var != 0) | |
4223 { | |
4224 excess = 0; | |
4225 size_rtx = ARGS_SIZE_RTX (arg->locate.size); | |
4226 } | |
4227 else | |
4228 { | |
4229 /* PUSH_ROUNDING has no effect on us, because emit_push_insn | |
4230 for BLKmode is careful to avoid it. */ | |
4231 excess = (arg->locate.size.constant | |
4232 - int_size_in_bytes (TREE_TYPE (pval)) | |
4233 + partial); | |
4234 size_rtx = expand_expr (size_in_bytes (TREE_TYPE (pval)), | |
4235 NULL_RTX, TYPE_MODE (sizetype), 0); | |
4236 } | |
4237 | |
4238 parm_align = arg->locate.boundary; | |
4239 | |
4240 /* When an argument is padded down, the block is aligned to | |
4241 PARM_BOUNDARY, but the actual argument isn't. */ | |
4242 if (FUNCTION_ARG_PADDING (arg->mode, TREE_TYPE (pval)) == downward) | |
4243 { | |
4244 if (arg->locate.size.var) | |
4245 parm_align = BITS_PER_UNIT; | |
4246 else if (excess) | |
4247 { | |
4248 unsigned int excess_align = (excess & -excess) * BITS_PER_UNIT; | |
4249 parm_align = MIN (parm_align, excess_align); | |
4250 } | |
4251 } | |
4252 | |
4253 if ((flags & ECF_SIBCALL) && MEM_P (arg->value)) | |
4254 { | |
4255 /* emit_push_insn might not work properly if arg->value and | |
4256 argblock + arg->locate.offset areas overlap. */ | |
4257 rtx x = arg->value; | |
4258 int i = 0; | |
4259 | |
4260 if (XEXP (x, 0) == crtl->args.internal_arg_pointer | |
4261 || (GET_CODE (XEXP (x, 0)) == PLUS | |
4262 && XEXP (XEXP (x, 0), 0) == | |
4263 crtl->args.internal_arg_pointer | |
4264 && GET_CODE (XEXP (XEXP (x, 0), 1)) == CONST_INT)) | |
4265 { | |
4266 if (XEXP (x, 0) != crtl->args.internal_arg_pointer) | |
4267 i = INTVAL (XEXP (XEXP (x, 0), 1)); | |
4268 | |
4269 /* expand_call should ensure this. */ | |
4270 gcc_assert (!arg->locate.offset.var | |
4271 && arg->locate.size.var == 0 | |
4272 && GET_CODE (size_rtx) == CONST_INT); | |
4273 | |
4274 if (arg->locate.offset.constant > i) | |
4275 { | |
4276 if (arg->locate.offset.constant < i + INTVAL (size_rtx)) | |
4277 sibcall_failure = 1; | |
4278 } | |
4279 else if (arg->locate.offset.constant < i) | |
4280 { | |
4281 /* Use arg->locate.size.constant instead of size_rtx | |
4282 because we only care about the part of the argument | |
4283 on the stack. */ | |
4284 if (i < (arg->locate.offset.constant | |
4285 + arg->locate.size.constant)) | |
4286 sibcall_failure = 1; | |
4287 } | |
4288 else | |
4289 { | |
4290 /* Even though they appear to be at the same location, | |
4291 if part of the outgoing argument is in registers, | |
4292 they aren't really at the same location. Check for | |
4293 this by making sure that the incoming size is the | |
4294 same as the outgoing size. */ | |
4295 if (arg->locate.size.constant != INTVAL (size_rtx)) | |
4296 sibcall_failure = 1; | |
4297 } | |
4298 } | |
4299 } | |
4300 | |
4301 emit_push_insn (arg->value, arg->mode, TREE_TYPE (pval), size_rtx, | |
4302 parm_align, partial, reg, excess, argblock, | |
4303 ARGS_SIZE_RTX (arg->locate.offset), reg_parm_stack_space, | |
4304 ARGS_SIZE_RTX (arg->locate.alignment_pad)); | |
4305 | |
4306 /* Unless this is a partially-in-register argument, the argument is now | |
4307 in the stack. | |
4308 | |
4309 ??? Unlike the case above, in which we want the actual | |
4310 address of the data, so that we can load it directly into a | |
4311 register, here we want the address of the stack slot, so that | |
4312 it's properly aligned for word-by-word copying or something | |
4313 like that. It's not clear that this is always correct. */ | |
4314 if (partial == 0) | |
4315 arg->value = arg->stack_slot; | |
4316 } | |
4317 | |
4318 if (arg->reg && GET_CODE (arg->reg) == PARALLEL) | |
4319 { | |
4320 tree type = TREE_TYPE (arg->tree_value); | |
4321 arg->parallel_value | |
4322 = emit_group_load_into_temps (arg->reg, arg->value, type, | |
4323 int_size_in_bytes (type)); | |
4324 } | |
4325 | |
4326 /* Mark all slots this store used. */ | |
4327 if (ACCUMULATE_OUTGOING_ARGS && !(flags & ECF_SIBCALL) | |
4328 && argblock && ! variable_size && arg->stack) | |
4329 for (i = lower_bound; i < upper_bound; i++) | |
4330 stack_usage_map[i] = 1; | |
4331 | |
4332 /* Once we have pushed something, pops can't safely | |
4333 be deferred during the rest of the arguments. */ | |
4334 NO_DEFER_POP; | |
4335 | |
4336 /* Free any temporary slots made in processing this argument. Show | |
4337 that we might have taken the address of something and pushed that | |
4338 as an operand. */ | |
4339 preserve_temp_slots (NULL_RTX); | |
4340 free_temp_slots (); | |
4341 pop_temp_slots (); | |
4342 | |
4343 return sibcall_failure; | |
4344 } | |
4345 | |
4346 /* Nonzero if we do not know how to pass TYPE solely in registers. */ | |
4347 | |
4348 bool | |
4349 must_pass_in_stack_var_size (enum machine_mode mode ATTRIBUTE_UNUSED, | |
4350 const_tree type) | |
4351 { | |
4352 if (!type) | |
4353 return false; | |
4354 | |
4355 /* If the type has variable size... */ | |
4356 if (TREE_CODE (TYPE_SIZE (type)) != INTEGER_CST) | |
4357 return true; | |
4358 | |
4359 /* If the type is marked as addressable (it is required | |
4360 to be constructed into the stack)... */ | |
4361 if (TREE_ADDRESSABLE (type)) | |
4362 return true; | |
4363 | |
4364 return false; | |
4365 } | |
4366 | |
4367 /* Another version of the TARGET_MUST_PASS_IN_STACK hook. This one | |
4368 takes trailing padding of a structure into account. */ | |
4369 /* ??? Should be able to merge these two by examining BLOCK_REG_PADDING. */ | |
4370 | |
4371 bool | |
4372 must_pass_in_stack_var_size_or_pad (enum machine_mode mode, const_tree type) | |
4373 { | |
4374 if (!type) | |
4375 return false; | |
4376 | |
4377 /* If the type has variable size... */ | |
4378 if (TREE_CODE (TYPE_SIZE (type)) != INTEGER_CST) | |
4379 return true; | |
4380 | |
4381 /* If the type is marked as addressable (it is required | |
4382 to be constructed into the stack)... */ | |
4383 if (TREE_ADDRESSABLE (type)) | |
4384 return true; | |
4385 | |
4386 /* If the padding and mode of the type is such that a copy into | |
4387 a register would put it into the wrong part of the register. */ | |
4388 if (mode == BLKmode | |
4389 && int_size_in_bytes (type) % (PARM_BOUNDARY / BITS_PER_UNIT) | |
4390 && (FUNCTION_ARG_PADDING (mode, type) | |
4391 == (BYTES_BIG_ENDIAN ? upward : downward))) | |
4392 return true; | |
4393 | |
4394 return false; | |
4395 } |