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51bbfa0c | 1 | /* Convert function calls to rtl insns, for GNU C compiler. |
61f71b34 | 2 | Copyright (C) 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998, |
0196c95e | 3 | 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 |
bfc45551 | 4 | Free Software Foundation, Inc. |
51bbfa0c | 5 | |
1322177d | 6 | This file is part of GCC. |
51bbfa0c | 7 | |
1322177d LB |
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 | |
9dcd6f09 | 10 | Software Foundation; either version 3, or (at your option) any later |
1322177d | 11 | version. |
51bbfa0c | 12 | |
1322177d LB |
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. | |
51bbfa0c RS |
17 | |
18 | You should have received a copy of the GNU General Public License | |
9dcd6f09 NC |
19 | along with GCC; see the file COPYING3. If not see |
20 | <http://www.gnu.org/licenses/>. */ | |
51bbfa0c RS |
21 | |
22 | #include "config.h" | |
670ee920 | 23 | #include "system.h" |
4977bab6 ZW |
24 | #include "coretypes.h" |
25 | #include "tm.h" | |
670ee920 KG |
26 | #include "rtl.h" |
27 | #include "tree.h" | |
726a989a | 28 | #include "gimple.h" |
670ee920 KG |
29 | #include "flags.h" |
30 | #include "expr.h" | |
6e985040 | 31 | #include "optabs.h" |
e78d8e51 | 32 | #include "libfuncs.h" |
49ad7cfa | 33 | #include "function.h" |
670ee920 | 34 | #include "regs.h" |
5f6da302 | 35 | #include "toplev.h" |
d6f4ec51 | 36 | #include "output.h" |
b1474bb7 | 37 | #include "tm_p.h" |
ea11ca7e | 38 | #include "timevar.h" |
c67846f2 | 39 | #include "sbitmap.h" |
b0c48229 | 40 | #include "langhooks.h" |
23626154 | 41 | #include "target.h" |
b255a036 | 42 | #include "cgraph.h" |
b2dd096b | 43 | #include "except.h" |
6fb5fa3c | 44 | #include "dbgcnt.h" |
726a989a | 45 | #include "tree-flow.h" |
51bbfa0c | 46 | |
c795bca9 BS |
47 | /* Like PREFERRED_STACK_BOUNDARY but in units of bytes, not bits. */ |
48 | #define STACK_BYTES (PREFERRED_STACK_BOUNDARY / BITS_PER_UNIT) | |
51bbfa0c RS |
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; | |
1efe6448 RK |
56 | /* Mode for value; TYPE_MODE unless promoted. */ |
57 | enum machine_mode mode; | |
51bbfa0c RS |
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 | |
cacbd532 | 63 | PARALLEL if the arg is to be copied into multiple non-contiguous |
51bbfa0c RS |
64 | registers. */ |
65 | rtx reg; | |
099e9712 JH |
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; | |
8df3dbb7 RH |
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; | |
84b55618 RK |
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; | |
f0078f86 AM |
76 | /* Number of bytes to put in registers. 0 means put the whole arg |
77 | in registers. Also 0 if not passed in registers. */ | |
51bbfa0c | 78 | int partial; |
da7d8304 | 79 | /* Nonzero if argument must be passed on stack. |
d64f5a78 RS |
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. */ | |
51bbfa0c | 83 | int pass_on_stack; |
e7949876 AM |
84 | /* Some fields packaged up for locate_and_pad_parm. */ |
85 | struct locate_and_pad_arg_data locate; | |
51bbfa0c RS |
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; | |
51bbfa0c RS |
93 | /* Place that this stack area has been saved, if needed. */ |
94 | rtx save_area; | |
4ab56118 RK |
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; | |
51bbfa0c RS |
101 | }; |
102 | ||
da7d8304 | 103 | /* A vector of one char per byte of stack space. A byte if nonzero if |
51bbfa0c RS |
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; | |
2f4aa534 | 111 | |
c67846f2 JJ |
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 | ||
2f4aa534 RS |
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. */ | |
0405cc0e | 124 | static int stack_arg_under_construction; |
51bbfa0c | 125 | |
6de9cd9a | 126 | static void emit_call_1 (rtx, tree, tree, tree, HOST_WIDE_INT, HOST_WIDE_INT, |
d329e058 AJ |
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 *); | |
84b8030f | 134 | static void precompute_arguments (int, struct arg_data *); |
5d059ed9 | 135 | static int compute_argument_block_size (int, struct args_size *, tree, tree, int); |
d329e058 | 136 | static void initialize_argument_information (int, struct arg_data *, |
078a18a4 SL |
137 | struct args_size *, int, |
138 | tree, tree, | |
45769134 | 139 | tree, tree, CUMULATIVE_ARGS *, int, |
dd292d0a | 140 | rtx *, int *, int *, int *, |
6de9cd9a | 141 | bool *, bool); |
d329e058 AJ |
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); | |
6ea2b70d | 148 | static int special_function_p (const_tree, int); |
d329e058 AJ |
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 *, | |
95899b34 | 153 | unsigned int); |
2f2b4a02 | 154 | static tree split_complex_types (tree); |
21a3b983 | 155 | |
f73ad30e | 156 | #ifdef REG_PARM_STACK_SPACE |
d329e058 AJ |
157 | static rtx save_fixed_argument_area (int, rtx, int *, int *); |
158 | static void restore_fixed_argument_area (rtx, rtx, int, int); | |
20efdf74 | 159 | #endif |
51bbfa0c | 160 | \f |
51bbfa0c RS |
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 | ||
77cac2f2 RK |
165 | CALL_FUSAGE points to a variable holding the prospective |
166 | CALL_INSN_FUNCTION_USAGE information. */ | |
51bbfa0c | 167 | |
03dacb02 | 168 | rtx |
6de9cd9a DN |
169 | prepare_call_address (rtx funexp, rtx static_chain_value, |
170 | rtx *call_fusage, int reg_parm_seen, int sibcallp) | |
51bbfa0c | 171 | { |
ba228239 | 172 | /* Make a valid memory address and copy constants through pseudo-regs, |
51bbfa0c RS |
173 | but not for a constant address if -fno-function-cse. */ |
174 | if (GET_CODE (funexp) != SYMBOL_REF) | |
01368078 | 175 | /* If we are using registers for parameters, force the |
e9a25f70 JL |
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)); | |
3affaf29 | 180 | else if (! sibcallp) |
51bbfa0c RS |
181 | { |
182 | #ifndef NO_FUNCTION_CSE | |
183 | if (optimize && ! flag_no_function_cse) | |
082a099c | 184 | funexp = force_reg (Pmode, funexp); |
51bbfa0c RS |
185 | #endif |
186 | } | |
187 | ||
188 | if (static_chain_value != 0) | |
189 | { | |
5e89a381 | 190 | static_chain_value = convert_memory_address (Pmode, static_chain_value); |
51bbfa0c RS |
191 | emit_move_insn (static_chain_rtx, static_chain_value); |
192 | ||
f8cfc6aa | 193 | if (REG_P (static_chain_rtx)) |
f991a240 | 194 | use_reg (call_fusage, static_chain_rtx); |
51bbfa0c RS |
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 | ||
607ea900 | 204 | FNDECL is the declaration node of the function. This is given to the |
2c8da025 RK |
205 | macro RETURN_POPS_ARGS to determine whether this function pops its own args. |
206 | ||
334c4f0f RK |
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. | |
51bbfa0c RS |
212 | |
213 | STACK_SIZE is the number of bytes of arguments on the stack, | |
c2732da3 JM |
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. | |
51bbfa0c RS |
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 | ||
94b25f81 | 237 | CALL_FUSAGE is either empty or an EXPR_LIST of USE expressions that |
6d2f8887 | 238 | denote registers used by the called function. */ |
f725a3ec | 239 | |
322e3e34 | 240 | static void |
28ed065e | 241 | emit_call_1 (rtx funexp, tree fntree ATTRIBUTE_UNUSED, tree fndecl ATTRIBUTE_UNUSED, |
6de9cd9a | 242 | tree funtype ATTRIBUTE_UNUSED, |
d329e058 AJ |
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) | |
51bbfa0c | 249 | { |
062e7fd8 | 250 | rtx rounded_stack_size_rtx = GEN_INT (rounded_stack_size); |
51bbfa0c RS |
251 | rtx call_insn; |
252 | int already_popped = 0; | |
fb5eebb9 | 253 | HOST_WIDE_INT n_popped = RETURN_POPS_ARGS (fndecl, funtype, stack_size); |
f45c9d95 ZW |
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 | |
51bbfa0c | 258 | |
fa5322fa AO |
259 | #ifdef CALL_POPS_ARGS |
260 | n_popped += CALL_POPS_ARGS (* args_so_far); | |
261 | #endif | |
d329e058 | 262 | |
51bbfa0c RS |
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 | ||
0a1c58a2 JL |
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 | |
f132f529 | 272 | && (n_popped > 0 || stack_size == 0)) |
0a1c58a2 | 273 | { |
8ac61af7 | 274 | rtx n_pop = GEN_INT (n_popped); |
0a1c58a2 JL |
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) | |
f45c9d95 | 281 | pat = GEN_SIBCALL_VALUE_POP (valreg, |
0a1c58a2 JL |
282 | gen_rtx_MEM (FUNCTION_MODE, funexp), |
283 | rounded_stack_size_rtx, next_arg_reg, | |
284 | n_pop); | |
285 | else | |
f45c9d95 | 286 | pat = GEN_SIBCALL_POP (gen_rtx_MEM (FUNCTION_MODE, funexp), |
0a1c58a2 JL |
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 | ||
51bbfa0c | 295 | #if defined (HAVE_call_pop) && defined (HAVE_call_value_pop) |
8ac61af7 RK |
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. */ | |
8bcafee3 JDA |
300 | #if defined (HAVE_call) && defined (HAVE_call_value) |
301 | if (HAVE_call && HAVE_call_value && HAVE_call_pop && HAVE_call_value_pop | |
9dd9bf80 | 302 | && n_popped > 0) |
8bcafee3 JDA |
303 | #else |
304 | if (HAVE_call_pop && HAVE_call_value_pop) | |
305 | #endif | |
51bbfa0c | 306 | { |
fb5eebb9 | 307 | rtx n_pop = GEN_INT (n_popped); |
51bbfa0c RS |
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. */ | |
2c8da025 | 312 | |
51bbfa0c | 313 | if (valreg) |
f45c9d95 | 314 | pat = GEN_CALL_VALUE_POP (valreg, |
38a448ca | 315 | gen_rtx_MEM (FUNCTION_MODE, funexp), |
062e7fd8 | 316 | rounded_stack_size_rtx, next_arg_reg, n_pop); |
51bbfa0c | 317 | else |
f45c9d95 | 318 | pat = GEN_CALL_POP (gen_rtx_MEM (FUNCTION_MODE, funexp), |
062e7fd8 | 319 | rounded_stack_size_rtx, next_arg_reg, n_pop); |
51bbfa0c RS |
320 | |
321 | emit_call_insn (pat); | |
322 | already_popped = 1; | |
323 | } | |
324 | else | |
325 | #endif | |
51bbfa0c | 326 | |
0a1c58a2 JL |
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) | |
f45c9d95 | 332 | emit_call_insn (GEN_SIBCALL_VALUE (valreg, |
0a1c58a2 JL |
333 | gen_rtx_MEM (FUNCTION_MODE, funexp), |
334 | rounded_stack_size_rtx, | |
335 | next_arg_reg, NULL_RTX)); | |
336 | else | |
f45c9d95 | 337 | emit_call_insn (GEN_SIBCALL (gen_rtx_MEM (FUNCTION_MODE, funexp), |
0a1c58a2 JL |
338 | rounded_stack_size_rtx, next_arg_reg, |
339 | struct_value_size_rtx)); | |
340 | } | |
341 | else | |
342 | #endif | |
343 | ||
51bbfa0c RS |
344 | #if defined (HAVE_call) && defined (HAVE_call_value) |
345 | if (HAVE_call && HAVE_call_value) | |
346 | { | |
347 | if (valreg) | |
f45c9d95 | 348 | emit_call_insn (GEN_CALL_VALUE (valreg, |
38a448ca | 349 | gen_rtx_MEM (FUNCTION_MODE, funexp), |
062e7fd8 | 350 | rounded_stack_size_rtx, next_arg_reg, |
e992302c | 351 | NULL_RTX)); |
51bbfa0c | 352 | else |
f45c9d95 | 353 | emit_call_insn (GEN_CALL (gen_rtx_MEM (FUNCTION_MODE, funexp), |
062e7fd8 | 354 | rounded_stack_size_rtx, next_arg_reg, |
51bbfa0c RS |
355 | struct_value_size_rtx)); |
356 | } | |
357 | else | |
358 | #endif | |
366de0ce | 359 | gcc_unreachable (); |
51bbfa0c | 360 | |
ee960939 OH |
361 | /* Find the call we just emitted. */ |
362 | call_insn = last_call_insn (); | |
51bbfa0c | 363 | |
ee960939 OH |
364 | /* Put the register usage information there. */ |
365 | add_function_usage_to (call_insn, call_fusage); | |
51bbfa0c RS |
366 | |
367 | /* If this is a const call, then set the insn's unchanging bit. */ | |
becfd6e5 KZ |
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; | |
51bbfa0c | 378 | |
12a22e76 JM |
379 | /* If this call can't throw, attach a REG_EH_REGION reg note to that |
380 | effect. */ | |
0a1c58a2 | 381 | if (ecf_flags & ECF_NOTHROW) |
65c5f2a6 | 382 | add_reg_note (call_insn, REG_EH_REGION, const0_rtx); |
12a22e76 | 383 | |
ca3920ad | 384 | if (ecf_flags & ECF_NORETURN) |
65c5f2a6 | 385 | add_reg_note (call_insn, REG_NORETURN, const0_rtx); |
ca3920ad | 386 | |
570a98eb | 387 | if (ecf_flags & ECF_RETURNS_TWICE) |
9defc9b7 | 388 | { |
65c5f2a6 | 389 | add_reg_note (call_insn, REG_SETJMP, const0_rtx); |
e3b5732b | 390 | cfun->calls_setjmp = 1; |
9defc9b7 | 391 | } |
570a98eb | 392 | |
0a1c58a2 JL |
393 | SIBLING_CALL_P (call_insn) = ((ecf_flags & ECF_SIBCALL) != 0); |
394 | ||
b1e64e0d RS |
395 | /* Restore this now, so that we do defer pops for this call's args |
396 | if the context of the call as a whole permits. */ | |
397 | inhibit_defer_pop = old_inhibit_defer_pop; | |
398 | ||
fb5eebb9 | 399 | if (n_popped > 0) |
51bbfa0c RS |
400 | { |
401 | if (!already_popped) | |
e3da301d | 402 | CALL_INSN_FUNCTION_USAGE (call_insn) |
38a448ca RH |
403 | = gen_rtx_EXPR_LIST (VOIDmode, |
404 | gen_rtx_CLOBBER (VOIDmode, stack_pointer_rtx), | |
405 | CALL_INSN_FUNCTION_USAGE (call_insn)); | |
fb5eebb9 | 406 | rounded_stack_size -= n_popped; |
062e7fd8 | 407 | rounded_stack_size_rtx = GEN_INT (rounded_stack_size); |
1503a7ec | 408 | stack_pointer_delta -= n_popped; |
2e3f842f L |
409 | |
410 | /* If popup is needed, stack realign must use DRAP */ | |
411 | if (SUPPORTS_STACK_ALIGNMENT) | |
412 | crtl->need_drap = true; | |
51bbfa0c RS |
413 | } |
414 | ||
f73ad30e | 415 | if (!ACCUMULATE_OUTGOING_ARGS) |
51bbfa0c | 416 | { |
f73ad30e JH |
417 | /* If returning from the subroutine does not automatically pop the args, |
418 | we need an instruction to pop them sooner or later. | |
419 | Perhaps do it now; perhaps just record how much space to pop later. | |
420 | ||
421 | If returning from the subroutine does pop the args, indicate that the | |
422 | stack pointer will be changed. */ | |
423 | ||
f79a65c0 | 424 | if (rounded_stack_size != 0) |
f73ad30e | 425 | { |
9dd9bf80 | 426 | if (ecf_flags & ECF_NORETURN) |
f79a65c0 RK |
427 | /* Just pretend we did the pop. */ |
428 | stack_pointer_delta -= rounded_stack_size; | |
429 | else if (flag_defer_pop && inhibit_defer_pop == 0 | |
7393c642 | 430 | && ! (ecf_flags & (ECF_CONST | ECF_PURE))) |
f73ad30e JH |
431 | pending_stack_adjust += rounded_stack_size; |
432 | else | |
433 | adjust_stack (rounded_stack_size_rtx); | |
434 | } | |
51bbfa0c | 435 | } |
f73ad30e JH |
436 | /* When we accumulate outgoing args, we must avoid any stack manipulations. |
437 | Restore the stack pointer to its original value now. Usually | |
438 | ACCUMULATE_OUTGOING_ARGS targets don't get here, but there are exceptions. | |
439 | On i386 ACCUMULATE_OUTGOING_ARGS can be enabled on demand, and | |
440 | popping variants of functions exist as well. | |
441 | ||
442 | ??? We may optimize similar to defer_pop above, but it is | |
443 | probably not worthwhile. | |
f725a3ec | 444 | |
f73ad30e JH |
445 | ??? It will be worthwhile to enable combine_stack_adjustments even for |
446 | such machines. */ | |
447 | else if (n_popped) | |
448 | anti_adjust_stack (GEN_INT (n_popped)); | |
51bbfa0c RS |
449 | } |
450 | ||
20efdf74 JL |
451 | /* Determine if the function identified by NAME and FNDECL is one with |
452 | special properties we wish to know about. | |
453 | ||
454 | For example, if the function might return more than one time (setjmp), then | |
455 | set RETURNS_TWICE to a nonzero value. | |
456 | ||
bae802f9 | 457 | Similarly set NORETURN if the function is in the longjmp family. |
20efdf74 | 458 | |
20efdf74 JL |
459 | Set MAY_BE_ALLOCA for any memory allocation function that might allocate |
460 | space from the stack such as alloca. */ | |
461 | ||
f2d33f13 | 462 | static int |
6ea2b70d | 463 | special_function_p (const_tree fndecl, int flags) |
20efdf74 | 464 | { |
6de9cd9a | 465 | if (fndecl && DECL_NAME (fndecl) |
140592a0 | 466 | && IDENTIFIER_LENGTH (DECL_NAME (fndecl)) <= 17 |
20efdf74 JL |
467 | /* Exclude functions not at the file scope, or not `extern', |
468 | since they are not the magic functions we would otherwise | |
d1bd0ded | 469 | think they are. |
c22cacf3 MS |
470 | FIXME: this should be handled with attributes, not with this |
471 | hacky imitation of DECL_ASSEMBLER_NAME. It's (also) wrong | |
472 | because you can declare fork() inside a function if you | |
473 | wish. */ | |
7ae4ad28 | 474 | && (DECL_CONTEXT (fndecl) == NULL_TREE |
d1bd0ded GK |
475 | || TREE_CODE (DECL_CONTEXT (fndecl)) == TRANSLATION_UNIT_DECL) |
476 | && TREE_PUBLIC (fndecl)) | |
20efdf74 | 477 | { |
63ad61ed ZW |
478 | const char *name = IDENTIFIER_POINTER (DECL_NAME (fndecl)); |
479 | const char *tname = name; | |
20efdf74 | 480 | |
ca54603f JL |
481 | /* We assume that alloca will always be called by name. It |
482 | makes no sense to pass it as a pointer-to-function to | |
483 | anything that does not understand its behavior. */ | |
f2d33f13 JH |
484 | if (((IDENTIFIER_LENGTH (DECL_NAME (fndecl)) == 6 |
485 | && name[0] == 'a' | |
486 | && ! strcmp (name, "alloca")) | |
487 | || (IDENTIFIER_LENGTH (DECL_NAME (fndecl)) == 16 | |
488 | && name[0] == '_' | |
489 | && ! strcmp (name, "__builtin_alloca")))) | |
490 | flags |= ECF_MAY_BE_ALLOCA; | |
ca54603f | 491 | |
b545e411 | 492 | /* Disregard prefix _, __, __x or __builtin_. */ |
20efdf74 JL |
493 | if (name[0] == '_') |
494 | { | |
b545e411 JJ |
495 | if (name[1] == '_' |
496 | && name[2] == 'b' | |
497 | && !strncmp (name + 3, "uiltin_", 7)) | |
498 | tname += 10; | |
499 | else if (name[1] == '_' && name[2] == 'x') | |
20efdf74 JL |
500 | tname += 3; |
501 | else if (name[1] == '_') | |
502 | tname += 2; | |
503 | else | |
504 | tname += 1; | |
505 | } | |
506 | ||
507 | if (tname[0] == 's') | |
508 | { | |
f2d33f13 JH |
509 | if ((tname[1] == 'e' |
510 | && (! strcmp (tname, "setjmp") | |
511 | || ! strcmp (tname, "setjmp_syscall"))) | |
512 | || (tname[1] == 'i' | |
513 | && ! strcmp (tname, "sigsetjmp")) | |
514 | || (tname[1] == 'a' | |
515 | && ! strcmp (tname, "savectx"))) | |
516 | flags |= ECF_RETURNS_TWICE; | |
517 | ||
20efdf74 JL |
518 | if (tname[1] == 'i' |
519 | && ! strcmp (tname, "siglongjmp")) | |
6e14af16 | 520 | flags |= ECF_NORETURN; |
20efdf74 JL |
521 | } |
522 | else if ((tname[0] == 'q' && tname[1] == 's' | |
523 | && ! strcmp (tname, "qsetjmp")) | |
524 | || (tname[0] == 'v' && tname[1] == 'f' | |
cd9ed4b4 EB |
525 | && ! strcmp (tname, "vfork")) |
526 | || (tname[0] == 'g' && tname[1] == 'e' | |
527 | && !strcmp (tname, "getcontext"))) | |
f2d33f13 | 528 | flags |= ECF_RETURNS_TWICE; |
20efdf74 JL |
529 | |
530 | else if (tname[0] == 'l' && tname[1] == 'o' | |
531 | && ! strcmp (tname, "longjmp")) | |
6e14af16 | 532 | flags |= ECF_NORETURN; |
20efdf74 | 533 | } |
d1c38823 | 534 | |
f2d33f13 | 535 | return flags; |
20efdf74 JL |
536 | } |
537 | ||
bae802f9 | 538 | /* Return nonzero when FNDECL represents a call to setjmp. */ |
7393c642 | 539 | |
f2d33f13 | 540 | int |
6ea2b70d | 541 | setjmp_call_p (const_tree fndecl) |
f2d33f13 JH |
542 | { |
543 | return special_function_p (fndecl, 0) & ECF_RETURNS_TWICE; | |
544 | } | |
545 | ||
726a989a RB |
546 | |
547 | /* Return true if STMT is an alloca call. */ | |
548 | ||
549 | bool | |
550 | gimple_alloca_call_p (const_gimple stmt) | |
551 | { | |
552 | tree fndecl; | |
553 | ||
554 | if (!is_gimple_call (stmt)) | |
555 | return false; | |
556 | ||
557 | fndecl = gimple_call_fndecl (stmt); | |
558 | if (fndecl && (special_function_p (fndecl, 0) & ECF_MAY_BE_ALLOCA)) | |
559 | return true; | |
560 | ||
561 | return false; | |
562 | } | |
563 | ||
c986baf6 | 564 | /* Return true when exp contains alloca call. */ |
726a989a | 565 | |
c986baf6 | 566 | bool |
6ea2b70d | 567 | alloca_call_p (const_tree exp) |
c986baf6 JH |
568 | { |
569 | if (TREE_CODE (exp) == CALL_EXPR | |
5039610b SL |
570 | && TREE_CODE (CALL_EXPR_FN (exp)) == ADDR_EXPR |
571 | && (TREE_CODE (TREE_OPERAND (CALL_EXPR_FN (exp), 0)) == FUNCTION_DECL) | |
572 | && (special_function_p (TREE_OPERAND (CALL_EXPR_FN (exp), 0), 0) | |
573 | & ECF_MAY_BE_ALLOCA)) | |
c986baf6 JH |
574 | return true; |
575 | return false; | |
576 | } | |
577 | ||
b5cd4ed4 | 578 | /* Detect flags (function attributes) from the function decl or type node. */ |
7393c642 | 579 | |
4977bab6 | 580 | int |
6ea2b70d | 581 | flags_from_decl_or_type (const_tree exp) |
f2d33f13 JH |
582 | { |
583 | int flags = 0; | |
6ea2b70d | 584 | const_tree type = exp; |
36dbb93d | 585 | |
f2d33f13 JH |
586 | if (DECL_P (exp)) |
587 | { | |
b5cd4ed4 RK |
588 | type = TREE_TYPE (exp); |
589 | ||
f2d33f13 | 590 | /* The function exp may have the `malloc' attribute. */ |
36dbb93d | 591 | if (DECL_IS_MALLOC (exp)) |
f2d33f13 JH |
592 | flags |= ECF_MALLOC; |
593 | ||
6e9a3221 AN |
594 | /* The function exp may have the `returns_twice' attribute. */ |
595 | if (DECL_IS_RETURNS_TWICE (exp)) | |
596 | flags |= ECF_RETURNS_TWICE; | |
597 | ||
becfd6e5 KZ |
598 | /* Process the pure and const attributes. */ |
599 | if (TREE_READONLY (exp) && ! TREE_THIS_VOLATILE (exp)) | |
600 | flags |= ECF_CONST; | |
601 | if (DECL_PURE_P (exp)) | |
e238ccac | 602 | flags |= ECF_PURE; |
becfd6e5 KZ |
603 | if (DECL_LOOPING_CONST_OR_PURE_P (exp)) |
604 | flags |= ECF_LOOPING_CONST_OR_PURE; | |
2a8f6b90 | 605 | |
dcd6de6d ZD |
606 | if (DECL_IS_NOVOPS (exp)) |
607 | flags |= ECF_NOVOPS; | |
608 | ||
f2d33f13 JH |
609 | if (TREE_NOTHROW (exp)) |
610 | flags |= ECF_NOTHROW; | |
2b187c63 | 611 | |
6de9cd9a | 612 | flags = special_function_p (exp, flags); |
f2d33f13 | 613 | } |
4f976745 | 614 | else if (TYPE_P (exp) && TYPE_READONLY (exp) && ! TREE_THIS_VOLATILE (exp)) |
2b187c63 | 615 | flags |= ECF_CONST; |
f2d33f13 JH |
616 | |
617 | if (TREE_THIS_VOLATILE (exp)) | |
618 | flags |= ECF_NORETURN; | |
619 | ||
620 | return flags; | |
621 | } | |
622 | ||
f027e0a2 JM |
623 | /* Detect flags from a CALL_EXPR. */ |
624 | ||
625 | int | |
fa233e34 | 626 | call_expr_flags (const_tree t) |
f027e0a2 JM |
627 | { |
628 | int flags; | |
629 | tree decl = get_callee_fndecl (t); | |
630 | ||
631 | if (decl) | |
632 | flags = flags_from_decl_or_type (decl); | |
633 | else | |
634 | { | |
5039610b | 635 | t = TREE_TYPE (CALL_EXPR_FN (t)); |
f027e0a2 JM |
636 | if (t && TREE_CODE (t) == POINTER_TYPE) |
637 | flags = flags_from_decl_or_type (TREE_TYPE (t)); | |
638 | else | |
639 | flags = 0; | |
640 | } | |
641 | ||
642 | return flags; | |
643 | } | |
644 | ||
20efdf74 JL |
645 | /* Precompute all register parameters as described by ARGS, storing values |
646 | into fields within the ARGS array. | |
647 | ||
648 | NUM_ACTUALS indicates the total number elements in the ARGS array. | |
649 | ||
650 | Set REG_PARM_SEEN if we encounter a register parameter. */ | |
651 | ||
652 | static void | |
27e29549 RH |
653 | precompute_register_parameters (int num_actuals, struct arg_data *args, |
654 | int *reg_parm_seen) | |
20efdf74 JL |
655 | { |
656 | int i; | |
657 | ||
658 | *reg_parm_seen = 0; | |
659 | ||
660 | for (i = 0; i < num_actuals; i++) | |
661 | if (args[i].reg != 0 && ! args[i].pass_on_stack) | |
662 | { | |
663 | *reg_parm_seen = 1; | |
664 | ||
665 | if (args[i].value == 0) | |
666 | { | |
667 | push_temp_slots (); | |
84217346 | 668 | args[i].value = expand_normal (args[i].tree_value); |
20efdf74 JL |
669 | preserve_temp_slots (args[i].value); |
670 | pop_temp_slots (); | |
20efdf74 JL |
671 | } |
672 | ||
fd1e5d25 RH |
673 | /* If the value is a non-legitimate constant, force it into a |
674 | pseudo now. TLS symbols sometimes need a call to resolve. */ | |
675 | if (CONSTANT_P (args[i].value) | |
676 | && !LEGITIMATE_CONSTANT_P (args[i].value)) | |
677 | args[i].value = force_reg (args[i].mode, args[i].value); | |
678 | ||
20efdf74 JL |
679 | /* If we are to promote the function arg to a wider mode, |
680 | do it now. */ | |
681 | ||
682 | if (args[i].mode != TYPE_MODE (TREE_TYPE (args[i].tree_value))) | |
683 | args[i].value | |
684 | = convert_modes (args[i].mode, | |
685 | TYPE_MODE (TREE_TYPE (args[i].tree_value)), | |
686 | args[i].value, args[i].unsignedp); | |
687 | ||
27e29549 RH |
688 | /* If we're going to have to load the value by parts, pull the |
689 | parts into pseudos. The part extraction process can involve | |
690 | non-trivial computation. */ | |
691 | if (GET_CODE (args[i].reg) == PARALLEL) | |
692 | { | |
693 | tree type = TREE_TYPE (args[i].tree_value); | |
8df3dbb7 | 694 | args[i].parallel_value |
27e29549 RH |
695 | = emit_group_load_into_temps (args[i].reg, args[i].value, |
696 | type, int_size_in_bytes (type)); | |
697 | } | |
698 | ||
f725a3ec | 699 | /* If the value is expensive, and we are inside an appropriately |
20efdf74 JL |
700 | short loop, put the value into a pseudo and then put the pseudo |
701 | into the hard reg. | |
702 | ||
703 | For small register classes, also do this if this call uses | |
704 | register parameters. This is to avoid reload conflicts while | |
705 | loading the parameters registers. */ | |
706 | ||
27e29549 RH |
707 | else if ((! (REG_P (args[i].value) |
708 | || (GET_CODE (args[i].value) == SUBREG | |
709 | && REG_P (SUBREG_REG (args[i].value))))) | |
710 | && args[i].mode != BLKmode | |
f40751dd JH |
711 | && rtx_cost (args[i].value, SET, optimize_insn_for_speed_p ()) |
712 | > COSTS_N_INSNS (1) | |
27e29549 RH |
713 | && ((SMALL_REGISTER_CLASSES && *reg_parm_seen) |
714 | || optimize)) | |
20efdf74 JL |
715 | args[i].value = copy_to_mode_reg (args[i].mode, args[i].value); |
716 | } | |
717 | } | |
718 | ||
f73ad30e | 719 | #ifdef REG_PARM_STACK_SPACE |
20efdf74 JL |
720 | |
721 | /* The argument list is the property of the called routine and it | |
722 | may clobber it. If the fixed area has been used for previous | |
723 | parameters, we must save and restore it. */ | |
3bdf5ad1 | 724 | |
20efdf74 | 725 | static rtx |
d329e058 | 726 | save_fixed_argument_area (int reg_parm_stack_space, rtx argblock, int *low_to_save, int *high_to_save) |
20efdf74 | 727 | { |
b820d2b8 AM |
728 | int low; |
729 | int high; | |
20efdf74 | 730 | |
b820d2b8 AM |
731 | /* Compute the boundary of the area that needs to be saved, if any. */ |
732 | high = reg_parm_stack_space; | |
20efdf74 | 733 | #ifdef ARGS_GROW_DOWNWARD |
b820d2b8 | 734 | high += 1; |
20efdf74 | 735 | #endif |
b820d2b8 AM |
736 | if (high > highest_outgoing_arg_in_use) |
737 | high = highest_outgoing_arg_in_use; | |
20efdf74 | 738 | |
b820d2b8 AM |
739 | for (low = 0; low < high; low++) |
740 | if (stack_usage_map[low] != 0) | |
741 | { | |
742 | int num_to_save; | |
743 | enum machine_mode save_mode; | |
744 | int delta; | |
745 | rtx stack_area; | |
746 | rtx save_area; | |
20efdf74 | 747 | |
b820d2b8 AM |
748 | while (stack_usage_map[--high] == 0) |
749 | ; | |
20efdf74 | 750 | |
b820d2b8 AM |
751 | *low_to_save = low; |
752 | *high_to_save = high; | |
753 | ||
754 | num_to_save = high - low + 1; | |
755 | save_mode = mode_for_size (num_to_save * BITS_PER_UNIT, MODE_INT, 1); | |
20efdf74 | 756 | |
b820d2b8 AM |
757 | /* If we don't have the required alignment, must do this |
758 | in BLKmode. */ | |
759 | if ((low & (MIN (GET_MODE_SIZE (save_mode), | |
760 | BIGGEST_ALIGNMENT / UNITS_PER_WORD) - 1))) | |
761 | save_mode = BLKmode; | |
20efdf74 JL |
762 | |
763 | #ifdef ARGS_GROW_DOWNWARD | |
b820d2b8 | 764 | delta = -high; |
20efdf74 | 765 | #else |
b820d2b8 | 766 | delta = low; |
20efdf74 | 767 | #endif |
b820d2b8 AM |
768 | stack_area = gen_rtx_MEM (save_mode, |
769 | memory_address (save_mode, | |
770 | plus_constant (argblock, | |
771 | delta))); | |
8ac61af7 | 772 | |
b820d2b8 AM |
773 | set_mem_align (stack_area, PARM_BOUNDARY); |
774 | if (save_mode == BLKmode) | |
775 | { | |
776 | save_area = assign_stack_temp (BLKmode, num_to_save, 0); | |
777 | emit_block_move (validize_mem (save_area), stack_area, | |
778 | GEN_INT (num_to_save), BLOCK_OP_CALL_PARM); | |
779 | } | |
780 | else | |
781 | { | |
782 | save_area = gen_reg_rtx (save_mode); | |
783 | emit_move_insn (save_area, stack_area); | |
784 | } | |
8ac61af7 | 785 | |
b820d2b8 AM |
786 | return save_area; |
787 | } | |
788 | ||
789 | return NULL_RTX; | |
20efdf74 JL |
790 | } |
791 | ||
792 | static void | |
d329e058 | 793 | restore_fixed_argument_area (rtx save_area, rtx argblock, int high_to_save, int low_to_save) |
20efdf74 JL |
794 | { |
795 | enum machine_mode save_mode = GET_MODE (save_area); | |
b820d2b8 AM |
796 | int delta; |
797 | rtx stack_area; | |
798 | ||
20efdf74 | 799 | #ifdef ARGS_GROW_DOWNWARD |
b820d2b8 | 800 | delta = -high_to_save; |
20efdf74 | 801 | #else |
b820d2b8 | 802 | delta = low_to_save; |
20efdf74 | 803 | #endif |
b820d2b8 AM |
804 | stack_area = gen_rtx_MEM (save_mode, |
805 | memory_address (save_mode, | |
806 | plus_constant (argblock, delta))); | |
807 | set_mem_align (stack_area, PARM_BOUNDARY); | |
20efdf74 JL |
808 | |
809 | if (save_mode != BLKmode) | |
810 | emit_move_insn (stack_area, save_area); | |
811 | else | |
44bb111a RH |
812 | emit_block_move (stack_area, validize_mem (save_area), |
813 | GEN_INT (high_to_save - low_to_save + 1), | |
814 | BLOCK_OP_CALL_PARM); | |
20efdf74 | 815 | } |
19652adf | 816 | #endif /* REG_PARM_STACK_SPACE */ |
f725a3ec | 817 | |
20efdf74 JL |
818 | /* If any elements in ARGS refer to parameters that are to be passed in |
819 | registers, but not in memory, and whose alignment does not permit a | |
820 | direct copy into registers. Copy the values into a group of pseudos | |
f725a3ec | 821 | which we will later copy into the appropriate hard registers. |
8e6a59fe MM |
822 | |
823 | Pseudos for each unaligned argument will be stored into the array | |
824 | args[argnum].aligned_regs. The caller is responsible for deallocating | |
825 | the aligned_regs array if it is nonzero. */ | |
826 | ||
20efdf74 | 827 | static void |
d329e058 | 828 | store_unaligned_arguments_into_pseudos (struct arg_data *args, int num_actuals) |
20efdf74 JL |
829 | { |
830 | int i, j; | |
f725a3ec | 831 | |
20efdf74 JL |
832 | for (i = 0; i < num_actuals; i++) |
833 | if (args[i].reg != 0 && ! args[i].pass_on_stack | |
834 | && args[i].mode == BLKmode | |
852d22b4 EB |
835 | && MEM_P (args[i].value) |
836 | && (MEM_ALIGN (args[i].value) | |
20efdf74 JL |
837 | < (unsigned int) MIN (BIGGEST_ALIGNMENT, BITS_PER_WORD))) |
838 | { | |
839 | int bytes = int_size_in_bytes (TREE_TYPE (args[i].tree_value)); | |
6e985040 | 840 | int endian_correction = 0; |
20efdf74 | 841 | |
78a52f11 RH |
842 | if (args[i].partial) |
843 | { | |
844 | gcc_assert (args[i].partial % UNITS_PER_WORD == 0); | |
845 | args[i].n_aligned_regs = args[i].partial / UNITS_PER_WORD; | |
846 | } | |
847 | else | |
848 | { | |
849 | args[i].n_aligned_regs | |
850 | = (bytes + UNITS_PER_WORD - 1) / UNITS_PER_WORD; | |
851 | } | |
852 | ||
5ed6ace5 | 853 | args[i].aligned_regs = XNEWVEC (rtx, args[i].n_aligned_regs); |
20efdf74 | 854 | |
6e985040 AM |
855 | /* Structures smaller than a word are normally aligned to the |
856 | least significant byte. On a BYTES_BIG_ENDIAN machine, | |
20efdf74 JL |
857 | this means we must skip the empty high order bytes when |
858 | calculating the bit offset. */ | |
6e985040 AM |
859 | if (bytes < UNITS_PER_WORD |
860 | #ifdef BLOCK_REG_PADDING | |
861 | && (BLOCK_REG_PADDING (args[i].mode, | |
862 | TREE_TYPE (args[i].tree_value), 1) | |
863 | == downward) | |
864 | #else | |
865 | && BYTES_BIG_ENDIAN | |
866 | #endif | |
867 | ) | |
868 | endian_correction = BITS_PER_WORD - bytes * BITS_PER_UNIT; | |
20efdf74 JL |
869 | |
870 | for (j = 0; j < args[i].n_aligned_regs; j++) | |
871 | { | |
872 | rtx reg = gen_reg_rtx (word_mode); | |
873 | rtx word = operand_subword_force (args[i].value, j, BLKmode); | |
874 | int bitsize = MIN (bytes * BITS_PER_UNIT, BITS_PER_WORD); | |
20efdf74 JL |
875 | |
876 | args[i].aligned_regs[j] = reg; | |
6e985040 | 877 | word = extract_bit_field (word, bitsize, 0, 1, NULL_RTX, |
b3520980 | 878 | word_mode, word_mode); |
20efdf74 JL |
879 | |
880 | /* There is no need to restrict this code to loading items | |
881 | in TYPE_ALIGN sized hunks. The bitfield instructions can | |
882 | load up entire word sized registers efficiently. | |
883 | ||
884 | ??? This may not be needed anymore. | |
885 | We use to emit a clobber here but that doesn't let later | |
886 | passes optimize the instructions we emit. By storing 0 into | |
887 | the register later passes know the first AND to zero out the | |
888 | bitfield being set in the register is unnecessary. The store | |
889 | of 0 will be deleted as will at least the first AND. */ | |
890 | ||
891 | emit_move_insn (reg, const0_rtx); | |
892 | ||
893 | bytes -= bitsize / BITS_PER_UNIT; | |
6e985040 | 894 | store_bit_field (reg, bitsize, endian_correction, word_mode, |
b3520980 | 895 | word); |
20efdf74 JL |
896 | } |
897 | } | |
898 | } | |
899 | ||
d7cdf113 | 900 | /* Fill in ARGS_SIZE and ARGS array based on the parameters found in |
078a18a4 | 901 | CALL_EXPR EXP. |
d7cdf113 JL |
902 | |
903 | NUM_ACTUALS is the total number of parameters. | |
904 | ||
905 | N_NAMED_ARGS is the total number of named arguments. | |
906 | ||
078a18a4 SL |
907 | STRUCT_VALUE_ADDR_VALUE is the implicit argument for a struct return |
908 | value, or null. | |
909 | ||
d7cdf113 JL |
910 | FNDECL is the tree code for the target of this call (if known) |
911 | ||
912 | ARGS_SO_FAR holds state needed by the target to know where to place | |
913 | the next argument. | |
914 | ||
915 | REG_PARM_STACK_SPACE is the number of bytes of stack space reserved | |
916 | for arguments which are passed in registers. | |
917 | ||
918 | OLD_STACK_LEVEL is a pointer to an rtx which olds the old stack level | |
919 | and may be modified by this routine. | |
920 | ||
f2d33f13 | 921 | OLD_PENDING_ADJ, MUST_PREALLOCATE and FLAGS are pointers to integer |
7ae4ad28 | 922 | flags which may may be modified by this routine. |
dd292d0a | 923 | |
6de9cd9a DN |
924 | MAY_TAILCALL is cleared if we encounter an invisible pass-by-reference |
925 | that requires allocation of stack space. | |
926 | ||
dd292d0a MM |
927 | CALL_FROM_THUNK_P is true if this call is the jump from a thunk to |
928 | the thunked-to function. */ | |
d7cdf113 JL |
929 | |
930 | static void | |
d329e058 AJ |
931 | initialize_argument_information (int num_actuals ATTRIBUTE_UNUSED, |
932 | struct arg_data *args, | |
933 | struct args_size *args_size, | |
934 | int n_named_args ATTRIBUTE_UNUSED, | |
078a18a4 | 935 | tree exp, tree struct_value_addr_value, |
45769134 | 936 | tree fndecl, tree fntype, |
d329e058 AJ |
937 | CUMULATIVE_ARGS *args_so_far, |
938 | int reg_parm_stack_space, | |
939 | rtx *old_stack_level, int *old_pending_adj, | |
dd292d0a | 940 | int *must_preallocate, int *ecf_flags, |
6de9cd9a | 941 | bool *may_tailcall, bool call_from_thunk_p) |
d7cdf113 | 942 | { |
db3927fb | 943 | location_t loc = EXPR_LOCATION (exp); |
d7cdf113 JL |
944 | /* 1 if scanning parms front to back, -1 if scanning back to front. */ |
945 | int inc; | |
946 | ||
947 | /* Count arg position in order args appear. */ | |
948 | int argpos; | |
949 | ||
950 | int i; | |
f725a3ec | 951 | |
d7cdf113 JL |
952 | args_size->constant = 0; |
953 | args_size->var = 0; | |
954 | ||
955 | /* In this loop, we consider args in the order they are written. | |
956 | We fill up ARGS from the front or from the back if necessary | |
957 | so that in any case the first arg to be pushed ends up at the front. */ | |
958 | ||
f73ad30e JH |
959 | if (PUSH_ARGS_REVERSED) |
960 | { | |
961 | i = num_actuals - 1, inc = -1; | |
962 | /* In this case, must reverse order of args | |
963 | so that we compute and push the last arg first. */ | |
964 | } | |
965 | else | |
966 | { | |
967 | i = 0, inc = 1; | |
968 | } | |
d7cdf113 | 969 | |
078a18a4 SL |
970 | /* First fill in the actual arguments in the ARGS array, splitting |
971 | complex arguments if necessary. */ | |
972 | { | |
973 | int j = i; | |
974 | call_expr_arg_iterator iter; | |
975 | tree arg; | |
976 | ||
977 | if (struct_value_addr_value) | |
978 | { | |
979 | args[j].tree_value = struct_value_addr_value; | |
980 | j += inc; | |
981 | } | |
982 | FOR_EACH_CALL_EXPR_ARG (arg, iter, exp) | |
983 | { | |
984 | tree argtype = TREE_TYPE (arg); | |
985 | if (targetm.calls.split_complex_arg | |
986 | && argtype | |
987 | && TREE_CODE (argtype) == COMPLEX_TYPE | |
988 | && targetm.calls.split_complex_arg (argtype)) | |
989 | { | |
990 | tree subtype = TREE_TYPE (argtype); | |
078a18a4 SL |
991 | args[j].tree_value = build1 (REALPART_EXPR, subtype, arg); |
992 | j += inc; | |
993 | args[j].tree_value = build1 (IMAGPART_EXPR, subtype, arg); | |
994 | } | |
995 | else | |
996 | args[j].tree_value = arg; | |
997 | j += inc; | |
998 | } | |
999 | } | |
1000 | ||
d7cdf113 | 1001 | /* I counts args in order (to be) pushed; ARGPOS counts in order written. */ |
078a18a4 | 1002 | for (argpos = 0; argpos < num_actuals; i += inc, argpos++) |
d7cdf113 | 1003 | { |
078a18a4 | 1004 | tree type = TREE_TYPE (args[i].tree_value); |
d7cdf113 JL |
1005 | int unsignedp; |
1006 | enum machine_mode mode; | |
1007 | ||
d7cdf113 | 1008 | /* Replace erroneous argument with constant zero. */ |
d0f062fb | 1009 | if (type == error_mark_node || !COMPLETE_TYPE_P (type)) |
d7cdf113 JL |
1010 | args[i].tree_value = integer_zero_node, type = integer_type_node; |
1011 | ||
1012 | /* If TYPE is a transparent union, pass things the way we would | |
1013 | pass the first field of the union. We have already verified that | |
1014 | the modes are the same. */ | |
2bf105ab | 1015 | if (TREE_CODE (type) == UNION_TYPE && TYPE_TRANSPARENT_UNION (type)) |
d7cdf113 JL |
1016 | type = TREE_TYPE (TYPE_FIELDS (type)); |
1017 | ||
1018 | /* Decide where to pass this arg. | |
1019 | ||
1020 | args[i].reg is nonzero if all or part is passed in registers. | |
1021 | ||
1022 | args[i].partial is nonzero if part but not all is passed in registers, | |
78a52f11 | 1023 | and the exact value says how many bytes are passed in registers. |
d7cdf113 JL |
1024 | |
1025 | args[i].pass_on_stack is nonzero if the argument must at least be | |
1026 | computed on the stack. It may then be loaded back into registers | |
1027 | if args[i].reg is nonzero. | |
1028 | ||
1029 | These decisions are driven by the FUNCTION_... macros and must agree | |
1030 | with those made by function.c. */ | |
1031 | ||
1032 | /* See if this argument should be passed by invisible reference. */ | |
0976078c RH |
1033 | if (pass_by_reference (args_so_far, TYPE_MODE (type), |
1034 | type, argpos < n_named_args)) | |
d7cdf113 | 1035 | { |
9969aaf6 RH |
1036 | bool callee_copies; |
1037 | tree base; | |
1038 | ||
1039 | callee_copies | |
6cdd5672 RH |
1040 | = reference_callee_copied (args_so_far, TYPE_MODE (type), |
1041 | type, argpos < n_named_args); | |
9969aaf6 RH |
1042 | |
1043 | /* If we're compiling a thunk, pass through invisible references | |
1044 | instead of making a copy. */ | |
dd292d0a | 1045 | if (call_from_thunk_p |
9969aaf6 RH |
1046 | || (callee_copies |
1047 | && !TREE_ADDRESSABLE (type) | |
1048 | && (base = get_base_address (args[i].tree_value)) | |
9c3d55b4 | 1049 | && TREE_CODE (base) != SSA_NAME |
9969aaf6 | 1050 | && (!DECL_P (base) || MEM_P (DECL_RTL (base))))) |
d7cdf113 | 1051 | { |
9969aaf6 RH |
1052 | /* We can't use sibcalls if a callee-copied argument is |
1053 | stored in the current function's frame. */ | |
1054 | if (!call_from_thunk_p && DECL_P (base) && !TREE_STATIC (base)) | |
9fd47435 RS |
1055 | *may_tailcall = false; |
1056 | ||
db3927fb AH |
1057 | args[i].tree_value = build_fold_addr_expr_loc (loc, |
1058 | args[i].tree_value); | |
9969aaf6 RH |
1059 | type = TREE_TYPE (args[i].tree_value); |
1060 | ||
becfd6e5 KZ |
1061 | if (*ecf_flags & ECF_CONST) |
1062 | *ecf_flags &= ~(ECF_CONST | ECF_LOOPING_CONST_OR_PURE); | |
f21add07 | 1063 | } |
d7cdf113 JL |
1064 | else |
1065 | { | |
1066 | /* We make a copy of the object and pass the address to the | |
1067 | function being called. */ | |
1068 | rtx copy; | |
1069 | ||
d0f062fb | 1070 | if (!COMPLETE_TYPE_P (type) |
b38f3813 EB |
1071 | || TREE_CODE (TYPE_SIZE_UNIT (type)) != INTEGER_CST |
1072 | || (flag_stack_check == GENERIC_STACK_CHECK | |
1073 | && compare_tree_int (TYPE_SIZE_UNIT (type), | |
1074 | STACK_CHECK_MAX_VAR_SIZE) > 0)) | |
d7cdf113 JL |
1075 | { |
1076 | /* This is a variable-sized object. Make space on the stack | |
1077 | for it. */ | |
078a18a4 | 1078 | rtx size_rtx = expr_size (args[i].tree_value); |
d7cdf113 JL |
1079 | |
1080 | if (*old_stack_level == 0) | |
1081 | { | |
1082 | emit_stack_save (SAVE_BLOCK, old_stack_level, NULL_RTX); | |
1083 | *old_pending_adj = pending_stack_adjust; | |
1084 | pending_stack_adjust = 0; | |
1085 | } | |
1086 | ||
1087 | copy = gen_rtx_MEM (BLKmode, | |
3bdf5ad1 RK |
1088 | allocate_dynamic_stack_space |
1089 | (size_rtx, NULL_RTX, TYPE_ALIGN (type))); | |
1090 | set_mem_attributes (copy, type, 1); | |
d7cdf113 JL |
1091 | } |
1092 | else | |
3bdf5ad1 | 1093 | copy = assign_temp (type, 0, 1, 0); |
d7cdf113 | 1094 | |
79f5e442 | 1095 | store_expr (args[i].tree_value, copy, 0, false); |
d7cdf113 | 1096 | |
becfd6e5 KZ |
1097 | /* Just change the const function to pure and then let |
1098 | the next test clear the pure based on | |
1099 | callee_copies. */ | |
1100 | if (*ecf_flags & ECF_CONST) | |
1101 | { | |
1102 | *ecf_flags &= ~ECF_CONST; | |
1103 | *ecf_flags |= ECF_PURE; | |
1104 | } | |
1105 | ||
1106 | if (!callee_copies && *ecf_flags & ECF_PURE) | |
1107 | *ecf_flags &= ~(ECF_PURE | ECF_LOOPING_CONST_OR_PURE); | |
9969aaf6 RH |
1108 | |
1109 | args[i].tree_value | |
db3927fb | 1110 | = build_fold_addr_expr_loc (loc, make_tree (type, copy)); |
9969aaf6 | 1111 | type = TREE_TYPE (args[i].tree_value); |
6de9cd9a | 1112 | *may_tailcall = false; |
d7cdf113 JL |
1113 | } |
1114 | } | |
1115 | ||
8df83eae | 1116 | unsignedp = TYPE_UNSIGNED (type); |
cde0f3fd PB |
1117 | mode = promote_function_mode (type, TYPE_MODE (type), &unsignedp, |
1118 | fndecl ? TREE_TYPE (fndecl) : fntype, 0); | |
d7cdf113 JL |
1119 | |
1120 | args[i].unsignedp = unsignedp; | |
1121 | args[i].mode = mode; | |
7d167afd | 1122 | |
099e9712 JH |
1123 | args[i].reg = FUNCTION_ARG (*args_so_far, mode, type, |
1124 | argpos < n_named_args); | |
7d167afd JJ |
1125 | #ifdef FUNCTION_INCOMING_ARG |
1126 | /* If this is a sibling call and the machine has register windows, the | |
1127 | register window has to be unwinded before calling the routine, so | |
1128 | arguments have to go into the incoming registers. */ | |
099e9712 | 1129 | args[i].tail_call_reg = FUNCTION_INCOMING_ARG (*args_so_far, mode, type, |
f725a3ec | 1130 | argpos < n_named_args); |
099e9712 JH |
1131 | #else |
1132 | args[i].tail_call_reg = args[i].reg; | |
7d167afd | 1133 | #endif |
7d167afd | 1134 | |
d7cdf113 JL |
1135 | if (args[i].reg) |
1136 | args[i].partial | |
78a52f11 RH |
1137 | = targetm.calls.arg_partial_bytes (args_so_far, mode, type, |
1138 | argpos < n_named_args); | |
d7cdf113 | 1139 | |
fe984136 | 1140 | args[i].pass_on_stack = targetm.calls.must_pass_in_stack (mode, type); |
d7cdf113 JL |
1141 | |
1142 | /* If FUNCTION_ARG returned a (parallel [(expr_list (nil) ...) ...]), | |
1143 | it means that we are to pass this arg in the register(s) designated | |
1144 | by the PARALLEL, but also to pass it in the stack. */ | |
1145 | if (args[i].reg && GET_CODE (args[i].reg) == PARALLEL | |
1146 | && XEXP (XVECEXP (args[i].reg, 0, 0), 0) == 0) | |
1147 | args[i].pass_on_stack = 1; | |
1148 | ||
1149 | /* If this is an addressable type, we must preallocate the stack | |
1150 | since we must evaluate the object into its final location. | |
1151 | ||
1152 | If this is to be passed in both registers and the stack, it is simpler | |
1153 | to preallocate. */ | |
1154 | if (TREE_ADDRESSABLE (type) | |
1155 | || (args[i].pass_on_stack && args[i].reg != 0)) | |
1156 | *must_preallocate = 1; | |
1157 | ||
d7cdf113 JL |
1158 | /* Compute the stack-size of this argument. */ |
1159 | if (args[i].reg == 0 || args[i].partial != 0 | |
1160 | || reg_parm_stack_space > 0 | |
1161 | || args[i].pass_on_stack) | |
1162 | locate_and_pad_parm (mode, type, | |
1163 | #ifdef STACK_PARMS_IN_REG_PARM_AREA | |
1164 | 1, | |
1165 | #else | |
1166 | args[i].reg != 0, | |
1167 | #endif | |
e7949876 AM |
1168 | args[i].pass_on_stack ? 0 : args[i].partial, |
1169 | fndecl, args_size, &args[i].locate); | |
648bb159 RS |
1170 | #ifdef BLOCK_REG_PADDING |
1171 | else | |
1172 | /* The argument is passed entirely in registers. See at which | |
1173 | end it should be padded. */ | |
1174 | args[i].locate.where_pad = | |
1175 | BLOCK_REG_PADDING (mode, type, | |
1176 | int_size_in_bytes (type) <= UNITS_PER_WORD); | |
1177 | #endif | |
f725a3ec | 1178 | |
d7cdf113 JL |
1179 | /* Update ARGS_SIZE, the total stack space for args so far. */ |
1180 | ||
e7949876 AM |
1181 | args_size->constant += args[i].locate.size.constant; |
1182 | if (args[i].locate.size.var) | |
1183 | ADD_PARM_SIZE (*args_size, args[i].locate.size.var); | |
d7cdf113 JL |
1184 | |
1185 | /* Increment ARGS_SO_FAR, which has info about which arg-registers | |
1186 | have been used, etc. */ | |
1187 | ||
959f3a06 | 1188 | FUNCTION_ARG_ADVANCE (*args_so_far, TYPE_MODE (type), type, |
d7cdf113 JL |
1189 | argpos < n_named_args); |
1190 | } | |
1191 | } | |
1192 | ||
599f37b6 JL |
1193 | /* Update ARGS_SIZE to contain the total size for the argument block. |
1194 | Return the original constant component of the argument block's size. | |
1195 | ||
1196 | REG_PARM_STACK_SPACE holds the number of bytes of stack space reserved | |
1197 | for arguments passed in registers. */ | |
1198 | ||
1199 | static int | |
d329e058 AJ |
1200 | compute_argument_block_size (int reg_parm_stack_space, |
1201 | struct args_size *args_size, | |
033df0b9 | 1202 | tree fndecl ATTRIBUTE_UNUSED, |
5d059ed9 | 1203 | tree fntype ATTRIBUTE_UNUSED, |
d329e058 | 1204 | int preferred_stack_boundary ATTRIBUTE_UNUSED) |
599f37b6 JL |
1205 | { |
1206 | int unadjusted_args_size = args_size->constant; | |
1207 | ||
f73ad30e JH |
1208 | /* For accumulate outgoing args mode we don't need to align, since the frame |
1209 | will be already aligned. Align to STACK_BOUNDARY in order to prevent | |
f5143c46 | 1210 | backends from generating misaligned frame sizes. */ |
f73ad30e JH |
1211 | if (ACCUMULATE_OUTGOING_ARGS && preferred_stack_boundary > STACK_BOUNDARY) |
1212 | preferred_stack_boundary = STACK_BOUNDARY; | |
f73ad30e | 1213 | |
599f37b6 JL |
1214 | /* Compute the actual size of the argument block required. The variable |
1215 | and constant sizes must be combined, the size may have to be rounded, | |
1216 | and there may be a minimum required size. */ | |
1217 | ||
1218 | if (args_size->var) | |
1219 | { | |
1220 | args_size->var = ARGS_SIZE_TREE (*args_size); | |
1221 | args_size->constant = 0; | |
1222 | ||
c2f8b491 JH |
1223 | preferred_stack_boundary /= BITS_PER_UNIT; |
1224 | if (preferred_stack_boundary > 1) | |
1503a7ec JH |
1225 | { |
1226 | /* We don't handle this case yet. To handle it correctly we have | |
f5143c46 | 1227 | to add the delta, round and subtract the delta. |
1503a7ec | 1228 | Currently no machine description requires this support. */ |
366de0ce | 1229 | gcc_assert (!(stack_pointer_delta & (preferred_stack_boundary - 1))); |
1503a7ec JH |
1230 | args_size->var = round_up (args_size->var, preferred_stack_boundary); |
1231 | } | |
599f37b6 JL |
1232 | |
1233 | if (reg_parm_stack_space > 0) | |
1234 | { | |
1235 | args_size->var | |
1236 | = size_binop (MAX_EXPR, args_size->var, | |
fed3cef0 | 1237 | ssize_int (reg_parm_stack_space)); |
599f37b6 | 1238 | |
599f37b6 JL |
1239 | /* The area corresponding to register parameters is not to count in |
1240 | the size of the block we need. So make the adjustment. */ | |
5d059ed9 | 1241 | if (! OUTGOING_REG_PARM_STACK_SPACE ((!fndecl ? fntype : TREE_TYPE (fndecl)))) |
ac294f0b KT |
1242 | args_size->var |
1243 | = size_binop (MINUS_EXPR, args_size->var, | |
1244 | ssize_int (reg_parm_stack_space)); | |
599f37b6 JL |
1245 | } |
1246 | } | |
1247 | else | |
1248 | { | |
c2f8b491 | 1249 | preferred_stack_boundary /= BITS_PER_UNIT; |
0a1c58a2 JL |
1250 | if (preferred_stack_boundary < 1) |
1251 | preferred_stack_boundary = 1; | |
fb5eebb9 | 1252 | args_size->constant = (((args_size->constant |
1503a7ec | 1253 | + stack_pointer_delta |
c2f8b491 JH |
1254 | + preferred_stack_boundary - 1) |
1255 | / preferred_stack_boundary | |
1256 | * preferred_stack_boundary) | |
1503a7ec | 1257 | - stack_pointer_delta); |
599f37b6 JL |
1258 | |
1259 | args_size->constant = MAX (args_size->constant, | |
1260 | reg_parm_stack_space); | |
1261 | ||
5d059ed9 | 1262 | if (! OUTGOING_REG_PARM_STACK_SPACE ((!fndecl ? fntype : TREE_TYPE (fndecl)))) |
ac294f0b | 1263 | args_size->constant -= reg_parm_stack_space; |
599f37b6 JL |
1264 | } |
1265 | return unadjusted_args_size; | |
1266 | } | |
1267 | ||
19832c77 | 1268 | /* Precompute parameters as needed for a function call. |
cc0b1adc | 1269 | |
f2d33f13 | 1270 | FLAGS is mask of ECF_* constants. |
cc0b1adc | 1271 | |
cc0b1adc JL |
1272 | NUM_ACTUALS is the number of arguments. |
1273 | ||
f725a3ec KH |
1274 | ARGS is an array containing information for each argument; this |
1275 | routine fills in the INITIAL_VALUE and VALUE fields for each | |
1276 | precomputed argument. */ | |
cc0b1adc JL |
1277 | |
1278 | static void | |
84b8030f | 1279 | precompute_arguments (int num_actuals, struct arg_data *args) |
cc0b1adc JL |
1280 | { |
1281 | int i; | |
1282 | ||
3638733b | 1283 | /* If this is a libcall, then precompute all arguments so that we do not |
82c82743 | 1284 | get extraneous instructions emitted as part of the libcall sequence. */ |
6a4e56a9 JJ |
1285 | |
1286 | /* If we preallocated the stack space, and some arguments must be passed | |
1287 | on the stack, then we must precompute any parameter which contains a | |
1288 | function call which will store arguments on the stack. | |
1289 | Otherwise, evaluating the parameter may clobber previous parameters | |
1290 | which have already been stored into the stack. (we have code to avoid | |
1291 | such case by saving the outgoing stack arguments, but it results in | |
1292 | worse code) */ | |
84b8030f | 1293 | if (!ACCUMULATE_OUTGOING_ARGS) |
82c82743 | 1294 | return; |
7ae4ad28 | 1295 | |
cc0b1adc | 1296 | for (i = 0; i < num_actuals; i++) |
82c82743 | 1297 | { |
cde0f3fd | 1298 | tree type; |
82c82743 | 1299 | enum machine_mode mode; |
ddef6bc7 | 1300 | |
84b8030f | 1301 | if (TREE_CODE (args[i].tree_value) != CALL_EXPR) |
6a4e56a9 JJ |
1302 | continue; |
1303 | ||
82c82743 | 1304 | /* If this is an addressable type, we cannot pre-evaluate it. */ |
cde0f3fd PB |
1305 | type = TREE_TYPE (args[i].tree_value); |
1306 | gcc_assert (!TREE_ADDRESSABLE (type)); | |
cc0b1adc | 1307 | |
82c82743 | 1308 | args[i].initial_value = args[i].value |
84217346 | 1309 | = expand_normal (args[i].tree_value); |
cc0b1adc | 1310 | |
cde0f3fd | 1311 | mode = TYPE_MODE (type); |
82c82743 RH |
1312 | if (mode != args[i].mode) |
1313 | { | |
cde0f3fd | 1314 | int unsignedp = args[i].unsignedp; |
82c82743 RH |
1315 | args[i].value |
1316 | = convert_modes (args[i].mode, mode, | |
1317 | args[i].value, args[i].unsignedp); | |
cde0f3fd | 1318 | |
82c82743 RH |
1319 | /* CSE will replace this only if it contains args[i].value |
1320 | pseudo, so convert it down to the declared mode using | |
1321 | a SUBREG. */ | |
1322 | if (REG_P (args[i].value) | |
cde0f3fd PB |
1323 | && GET_MODE_CLASS (args[i].mode) == MODE_INT |
1324 | && promote_mode (type, mode, &unsignedp) != args[i].mode) | |
82c82743 RH |
1325 | { |
1326 | args[i].initial_value | |
1327 | = gen_lowpart_SUBREG (mode, args[i].value); | |
1328 | SUBREG_PROMOTED_VAR_P (args[i].initial_value) = 1; | |
1329 | SUBREG_PROMOTED_UNSIGNED_SET (args[i].initial_value, | |
1330 | args[i].unsignedp); | |
1331 | } | |
82c82743 RH |
1332 | } |
1333 | } | |
cc0b1adc JL |
1334 | } |
1335 | ||
0f9b3ea6 JL |
1336 | /* Given the current state of MUST_PREALLOCATE and information about |
1337 | arguments to a function call in NUM_ACTUALS, ARGS and ARGS_SIZE, | |
1338 | compute and return the final value for MUST_PREALLOCATE. */ | |
1339 | ||
1340 | static int | |
5039610b SL |
1341 | finalize_must_preallocate (int must_preallocate, int num_actuals, |
1342 | struct arg_data *args, struct args_size *args_size) | |
0f9b3ea6 JL |
1343 | { |
1344 | /* See if we have or want to preallocate stack space. | |
1345 | ||
1346 | If we would have to push a partially-in-regs parm | |
1347 | before other stack parms, preallocate stack space instead. | |
1348 | ||
1349 | If the size of some parm is not a multiple of the required stack | |
1350 | alignment, we must preallocate. | |
1351 | ||
1352 | If the total size of arguments that would otherwise create a copy in | |
1353 | a temporary (such as a CALL) is more than half the total argument list | |
1354 | size, preallocation is faster. | |
1355 | ||
1356 | Another reason to preallocate is if we have a machine (like the m88k) | |
1357 | where stack alignment is required to be maintained between every | |
1358 | pair of insns, not just when the call is made. However, we assume here | |
1359 | that such machines either do not have push insns (and hence preallocation | |
1360 | would occur anyway) or the problem is taken care of with | |
1361 | PUSH_ROUNDING. */ | |
1362 | ||
1363 | if (! must_preallocate) | |
1364 | { | |
1365 | int partial_seen = 0; | |
1366 | int copy_to_evaluate_size = 0; | |
1367 | int i; | |
1368 | ||
1369 | for (i = 0; i < num_actuals && ! must_preallocate; i++) | |
1370 | { | |
1371 | if (args[i].partial > 0 && ! args[i].pass_on_stack) | |
1372 | partial_seen = 1; | |
1373 | else if (partial_seen && args[i].reg == 0) | |
1374 | must_preallocate = 1; | |
1375 | ||
1376 | if (TYPE_MODE (TREE_TYPE (args[i].tree_value)) == BLKmode | |
1377 | && (TREE_CODE (args[i].tree_value) == CALL_EXPR | |
1378 | || TREE_CODE (args[i].tree_value) == TARGET_EXPR | |
1379 | || TREE_CODE (args[i].tree_value) == COND_EXPR | |
1380 | || TREE_ADDRESSABLE (TREE_TYPE (args[i].tree_value)))) | |
1381 | copy_to_evaluate_size | |
1382 | += int_size_in_bytes (TREE_TYPE (args[i].tree_value)); | |
1383 | } | |
1384 | ||
1385 | if (copy_to_evaluate_size * 2 >= args_size->constant | |
1386 | && args_size->constant > 0) | |
1387 | must_preallocate = 1; | |
1388 | } | |
1389 | return must_preallocate; | |
1390 | } | |
599f37b6 | 1391 | |
a45bdd02 JL |
1392 | /* If we preallocated stack space, compute the address of each argument |
1393 | and store it into the ARGS array. | |
1394 | ||
f725a3ec | 1395 | We need not ensure it is a valid memory address here; it will be |
a45bdd02 JL |
1396 | validized when it is used. |
1397 | ||
1398 | ARGBLOCK is an rtx for the address of the outgoing arguments. */ | |
1399 | ||
1400 | static void | |
d329e058 | 1401 | compute_argument_addresses (struct arg_data *args, rtx argblock, int num_actuals) |
a45bdd02 JL |
1402 | { |
1403 | if (argblock) | |
1404 | { | |
1405 | rtx arg_reg = argblock; | |
1406 | int i, arg_offset = 0; | |
1407 | ||
1408 | if (GET_CODE (argblock) == PLUS) | |
1409 | arg_reg = XEXP (argblock, 0), arg_offset = INTVAL (XEXP (argblock, 1)); | |
1410 | ||
1411 | for (i = 0; i < num_actuals; i++) | |
1412 | { | |
e7949876 AM |
1413 | rtx offset = ARGS_SIZE_RTX (args[i].locate.offset); |
1414 | rtx slot_offset = ARGS_SIZE_RTX (args[i].locate.slot_offset); | |
a45bdd02 | 1415 | rtx addr; |
bfc45551 | 1416 | unsigned int align, boundary; |
7816b87e JC |
1417 | unsigned int units_on_stack = 0; |
1418 | enum machine_mode partial_mode = VOIDmode; | |
a45bdd02 JL |
1419 | |
1420 | /* Skip this parm if it will not be passed on the stack. */ | |
7816b87e JC |
1421 | if (! args[i].pass_on_stack |
1422 | && args[i].reg != 0 | |
1423 | && args[i].partial == 0) | |
a45bdd02 JL |
1424 | continue; |
1425 | ||
481683e1 | 1426 | if (CONST_INT_P (offset)) |
a45bdd02 JL |
1427 | addr = plus_constant (arg_reg, INTVAL (offset)); |
1428 | else | |
1429 | addr = gen_rtx_PLUS (Pmode, arg_reg, offset); | |
1430 | ||
1431 | addr = plus_constant (addr, arg_offset); | |
7816b87e JC |
1432 | |
1433 | if (args[i].partial != 0) | |
1434 | { | |
1435 | /* Only part of the parameter is being passed on the stack. | |
1436 | Generate a simple memory reference of the correct size. */ | |
1437 | units_on_stack = args[i].locate.size.constant; | |
1438 | partial_mode = mode_for_size (units_on_stack * BITS_PER_UNIT, | |
1439 | MODE_INT, 1); | |
1440 | args[i].stack = gen_rtx_MEM (partial_mode, addr); | |
1441 | set_mem_size (args[i].stack, GEN_INT (units_on_stack)); | |
1442 | } | |
1443 | else | |
1444 | { | |
1445 | args[i].stack = gen_rtx_MEM (args[i].mode, addr); | |
1446 | set_mem_attributes (args[i].stack, | |
1447 | TREE_TYPE (args[i].tree_value), 1); | |
1448 | } | |
bfc45551 AM |
1449 | align = BITS_PER_UNIT; |
1450 | boundary = args[i].locate.boundary; | |
1451 | if (args[i].locate.where_pad != downward) | |
1452 | align = boundary; | |
481683e1 | 1453 | else if (CONST_INT_P (offset)) |
bfc45551 AM |
1454 | { |
1455 | align = INTVAL (offset) * BITS_PER_UNIT | boundary; | |
1456 | align = align & -align; | |
1457 | } | |
1458 | set_mem_align (args[i].stack, align); | |
a45bdd02 | 1459 | |
481683e1 | 1460 | if (CONST_INT_P (slot_offset)) |
a45bdd02 JL |
1461 | addr = plus_constant (arg_reg, INTVAL (slot_offset)); |
1462 | else | |
1463 | addr = gen_rtx_PLUS (Pmode, arg_reg, slot_offset); | |
1464 | ||
1465 | addr = plus_constant (addr, arg_offset); | |
7816b87e JC |
1466 | |
1467 | if (args[i].partial != 0) | |
1468 | { | |
1469 | /* Only part of the parameter is being passed on the stack. | |
1470 | Generate a simple memory reference of the correct size. | |
1471 | */ | |
1472 | args[i].stack_slot = gen_rtx_MEM (partial_mode, addr); | |
1473 | set_mem_size (args[i].stack_slot, GEN_INT (units_on_stack)); | |
1474 | } | |
1475 | else | |
1476 | { | |
1477 | args[i].stack_slot = gen_rtx_MEM (args[i].mode, addr); | |
1478 | set_mem_attributes (args[i].stack_slot, | |
1479 | TREE_TYPE (args[i].tree_value), 1); | |
1480 | } | |
bfc45551 | 1481 | set_mem_align (args[i].stack_slot, args[i].locate.boundary); |
7ab923cc JJ |
1482 | |
1483 | /* Function incoming arguments may overlap with sibling call | |
1484 | outgoing arguments and we cannot allow reordering of reads | |
1485 | from function arguments with stores to outgoing arguments | |
1486 | of sibling calls. */ | |
ba4828e0 RK |
1487 | set_mem_alias_set (args[i].stack, 0); |
1488 | set_mem_alias_set (args[i].stack_slot, 0); | |
a45bdd02 JL |
1489 | } |
1490 | } | |
1491 | } | |
f725a3ec | 1492 | |
a45bdd02 JL |
1493 | /* Given a FNDECL and EXP, return an rtx suitable for use as a target address |
1494 | in a call instruction. | |
1495 | ||
1496 | FNDECL is the tree node for the target function. For an indirect call | |
1497 | FNDECL will be NULL_TREE. | |
1498 | ||
09e2bf48 | 1499 | ADDR is the operand 0 of CALL_EXPR for this call. */ |
a45bdd02 JL |
1500 | |
1501 | static rtx | |
d329e058 | 1502 | rtx_for_function_call (tree fndecl, tree addr) |
a45bdd02 JL |
1503 | { |
1504 | rtx funexp; | |
1505 | ||
1506 | /* Get the function to call, in the form of RTL. */ | |
1507 | if (fndecl) | |
1508 | { | |
1509 | /* If this is the first use of the function, see if we need to | |
1510 | make an external definition for it. */ | |
ad960f56 | 1511 | if (!TREE_USED (fndecl) && fndecl != current_function_decl) |
a45bdd02 JL |
1512 | { |
1513 | assemble_external (fndecl); | |
1514 | TREE_USED (fndecl) = 1; | |
1515 | } | |
1516 | ||
1517 | /* Get a SYMBOL_REF rtx for the function address. */ | |
1518 | funexp = XEXP (DECL_RTL (fndecl), 0); | |
1519 | } | |
1520 | else | |
1521 | /* Generate an rtx (probably a pseudo-register) for the address. */ | |
1522 | { | |
1523 | push_temp_slots (); | |
84217346 | 1524 | funexp = expand_normal (addr); |
f725a3ec | 1525 | pop_temp_slots (); /* FUNEXP can't be BLKmode. */ |
a45bdd02 JL |
1526 | } |
1527 | return funexp; | |
1528 | } | |
1529 | ||
07eef816 KH |
1530 | /* Return true if and only if SIZE storage units (usually bytes) |
1531 | starting from address ADDR overlap with already clobbered argument | |
1532 | area. This function is used to determine if we should give up a | |
1533 | sibcall. */ | |
1534 | ||
1535 | static bool | |
1536 | mem_overlaps_already_clobbered_arg_p (rtx addr, unsigned HOST_WIDE_INT size) | |
1537 | { | |
1538 | HOST_WIDE_INT i; | |
1539 | ||
38173d38 | 1540 | if (addr == crtl->args.internal_arg_pointer) |
07eef816 KH |
1541 | i = 0; |
1542 | else if (GET_CODE (addr) == PLUS | |
38173d38 | 1543 | && XEXP (addr, 0) == crtl->args.internal_arg_pointer |
481683e1 | 1544 | && CONST_INT_P (XEXP (addr, 1))) |
07eef816 | 1545 | i = INTVAL (XEXP (addr, 1)); |
ae22dcff EB |
1546 | /* Return true for arg pointer based indexed addressing. */ |
1547 | else if (GET_CODE (addr) == PLUS | |
38173d38 JH |
1548 | && (XEXP (addr, 0) == crtl->args.internal_arg_pointer |
1549 | || XEXP (addr, 1) == crtl->args.internal_arg_pointer)) | |
ae22dcff | 1550 | return true; |
07eef816 KH |
1551 | else |
1552 | return false; | |
1553 | ||
1554 | #ifdef ARGS_GROW_DOWNWARD | |
1555 | i = -i - size; | |
1556 | #endif | |
1557 | if (size > 0) | |
1558 | { | |
1559 | unsigned HOST_WIDE_INT k; | |
1560 | ||
1561 | for (k = 0; k < size; k++) | |
1562 | if (i + k < stored_args_map->n_bits | |
1563 | && TEST_BIT (stored_args_map, i + k)) | |
1564 | return true; | |
1565 | } | |
1566 | ||
1567 | return false; | |
1568 | } | |
1569 | ||
21a3b983 JL |
1570 | /* Do the register loads required for any wholly-register parms or any |
1571 | parms which are passed both on the stack and in a register. Their | |
f725a3ec | 1572 | expressions were already evaluated. |
21a3b983 JL |
1573 | |
1574 | Mark all register-parms as living through the call, putting these USE | |
d329e058 AJ |
1575 | insns in the CALL_INSN_FUNCTION_USAGE field. |
1576 | ||
40b0345d | 1577 | When IS_SIBCALL, perform the check_sibcall_argument_overlap |
0cdca92b | 1578 | checking, setting *SIBCALL_FAILURE if appropriate. */ |
21a3b983 JL |
1579 | |
1580 | static void | |
d329e058 AJ |
1581 | load_register_parameters (struct arg_data *args, int num_actuals, |
1582 | rtx *call_fusage, int flags, int is_sibcall, | |
1583 | int *sibcall_failure) | |
21a3b983 JL |
1584 | { |
1585 | int i, j; | |
1586 | ||
21a3b983 | 1587 | for (i = 0; i < num_actuals; i++) |
21a3b983 | 1588 | { |
099e9712 JH |
1589 | rtx reg = ((flags & ECF_SIBCALL) |
1590 | ? args[i].tail_call_reg : args[i].reg); | |
21a3b983 JL |
1591 | if (reg) |
1592 | { | |
6e985040 AM |
1593 | int partial = args[i].partial; |
1594 | int nregs; | |
1595 | int size = 0; | |
0cdca92b | 1596 | rtx before_arg = get_last_insn (); |
f0078f86 AM |
1597 | /* Set non-negative if we must move a word at a time, even if |
1598 | just one word (e.g, partial == 4 && mode == DFmode). Set | |
1599 | to -1 if we just use a normal move insn. This value can be | |
1600 | zero if the argument is a zero size structure. */ | |
6e985040 | 1601 | nregs = -1; |
78a52f11 RH |
1602 | if (GET_CODE (reg) == PARALLEL) |
1603 | ; | |
1604 | else if (partial) | |
1605 | { | |
1606 | gcc_assert (partial % UNITS_PER_WORD == 0); | |
1607 | nregs = partial / UNITS_PER_WORD; | |
1608 | } | |
6e985040 AM |
1609 | else if (TYPE_MODE (TREE_TYPE (args[i].tree_value)) == BLKmode) |
1610 | { | |
1611 | size = int_size_in_bytes (TREE_TYPE (args[i].tree_value)); | |
1612 | nregs = (size + (UNITS_PER_WORD - 1)) / UNITS_PER_WORD; | |
1613 | } | |
1614 | else | |
1615 | size = GET_MODE_SIZE (args[i].mode); | |
21a3b983 JL |
1616 | |
1617 | /* Handle calls that pass values in multiple non-contiguous | |
1618 | locations. The Irix 6 ABI has examples of this. */ | |
1619 | ||
1620 | if (GET_CODE (reg) == PARALLEL) | |
8df3dbb7 | 1621 | emit_group_move (reg, args[i].parallel_value); |
21a3b983 JL |
1622 | |
1623 | /* If simple case, just do move. If normal partial, store_one_arg | |
1624 | has already loaded the register for us. In all other cases, | |
1625 | load the register(s) from memory. */ | |
1626 | ||
9206d736 AM |
1627 | else if (nregs == -1) |
1628 | { | |
1629 | emit_move_insn (reg, args[i].value); | |
6e985040 | 1630 | #ifdef BLOCK_REG_PADDING |
9206d736 AM |
1631 | /* Handle case where we have a value that needs shifting |
1632 | up to the msb. eg. a QImode value and we're padding | |
1633 | upward on a BYTES_BIG_ENDIAN machine. */ | |
1634 | if (size < UNITS_PER_WORD | |
1635 | && (args[i].locate.where_pad | |
1636 | == (BYTES_BIG_ENDIAN ? upward : downward))) | |
1637 | { | |
9206d736 AM |
1638 | rtx x; |
1639 | int shift = (UNITS_PER_WORD - size) * BITS_PER_UNIT; | |
980f6e8e AM |
1640 | |
1641 | /* Assigning REG here rather than a temp makes CALL_FUSAGE | |
1642 | report the whole reg as used. Strictly speaking, the | |
1643 | call only uses SIZE bytes at the msb end, but it doesn't | |
1644 | seem worth generating rtl to say that. */ | |
1645 | reg = gen_rtx_REG (word_mode, REGNO (reg)); | |
09b52670 | 1646 | x = expand_shift (LSHIFT_EXPR, word_mode, reg, |
7d60be94 | 1647 | build_int_cst (NULL_TREE, shift), |
4a90aeeb | 1648 | reg, 1); |
980f6e8e AM |
1649 | if (x != reg) |
1650 | emit_move_insn (reg, x); | |
9206d736 | 1651 | } |
6e985040 | 1652 | #endif |
9206d736 | 1653 | } |
21a3b983 JL |
1654 | |
1655 | /* If we have pre-computed the values to put in the registers in | |
1656 | the case of non-aligned structures, copy them in now. */ | |
1657 | ||
1658 | else if (args[i].n_aligned_regs != 0) | |
1659 | for (j = 0; j < args[i].n_aligned_regs; j++) | |
1660 | emit_move_insn (gen_rtx_REG (word_mode, REGNO (reg) + j), | |
1661 | args[i].aligned_regs[j]); | |
1662 | ||
1663 | else if (partial == 0 || args[i].pass_on_stack) | |
6e985040 AM |
1664 | { |
1665 | rtx mem = validize_mem (args[i].value); | |
1666 | ||
07eef816 KH |
1667 | /* Check for overlap with already clobbered argument area. */ |
1668 | if (is_sibcall | |
1669 | && mem_overlaps_already_clobbered_arg_p (XEXP (args[i].value, 0), | |
1670 | size)) | |
1671 | *sibcall_failure = 1; | |
1672 | ||
6e985040 | 1673 | /* Handle a BLKmode that needs shifting. */ |
9206d736 | 1674 | if (nregs == 1 && size < UNITS_PER_WORD |
03ca1672 UW |
1675 | #ifdef BLOCK_REG_PADDING |
1676 | && args[i].locate.where_pad == downward | |
1677 | #else | |
1678 | && BYTES_BIG_ENDIAN | |
1679 | #endif | |
1680 | ) | |
6e985040 AM |
1681 | { |
1682 | rtx tem = operand_subword_force (mem, 0, args[i].mode); | |
1683 | rtx ri = gen_rtx_REG (word_mode, REGNO (reg)); | |
1684 | rtx x = gen_reg_rtx (word_mode); | |
1685 | int shift = (UNITS_PER_WORD - size) * BITS_PER_UNIT; | |
09b52670 RS |
1686 | enum tree_code dir = BYTES_BIG_ENDIAN ? RSHIFT_EXPR |
1687 | : LSHIFT_EXPR; | |
6e985040 AM |
1688 | |
1689 | emit_move_insn (x, tem); | |
09b52670 | 1690 | x = expand_shift (dir, word_mode, x, |
7d60be94 | 1691 | build_int_cst (NULL_TREE, shift), |
4a90aeeb | 1692 | ri, 1); |
6e985040 AM |
1693 | if (x != ri) |
1694 | emit_move_insn (ri, x); | |
1695 | } | |
1696 | else | |
6e985040 AM |
1697 | move_block_to_reg (REGNO (reg), mem, nregs, args[i].mode); |
1698 | } | |
21a3b983 | 1699 | |
0cdca92b DJ |
1700 | /* When a parameter is a block, and perhaps in other cases, it is |
1701 | possible that it did a load from an argument slot that was | |
32dd366d | 1702 | already clobbered. */ |
0cdca92b DJ |
1703 | if (is_sibcall |
1704 | && check_sibcall_argument_overlap (before_arg, &args[i], 0)) | |
1705 | *sibcall_failure = 1; | |
1706 | ||
21a3b983 JL |
1707 | /* Handle calls that pass values in multiple non-contiguous |
1708 | locations. The Irix 6 ABI has examples of this. */ | |
1709 | if (GET_CODE (reg) == PARALLEL) | |
1710 | use_group_regs (call_fusage, reg); | |
1711 | else if (nregs == -1) | |
1712 | use_reg (call_fusage, reg); | |
faa00334 AO |
1713 | else if (nregs > 0) |
1714 | use_regs (call_fusage, REGNO (reg), nregs); | |
21a3b983 JL |
1715 | } |
1716 | } | |
1717 | } | |
1718 | ||
739fb049 MM |
1719 | /* We need to pop PENDING_STACK_ADJUST bytes. But, if the arguments |
1720 | wouldn't fill up an even multiple of PREFERRED_UNIT_STACK_BOUNDARY | |
1721 | bytes, then we would need to push some additional bytes to pad the | |
ce48579b RH |
1722 | arguments. So, we compute an adjust to the stack pointer for an |
1723 | amount that will leave the stack under-aligned by UNADJUSTED_ARGS_SIZE | |
1724 | bytes. Then, when the arguments are pushed the stack will be perfectly | |
1725 | aligned. ARGS_SIZE->CONSTANT is set to the number of bytes that should | |
1726 | be popped after the call. Returns the adjustment. */ | |
739fb049 | 1727 | |
ce48579b | 1728 | static int |
d329e058 AJ |
1729 | combine_pending_stack_adjustment_and_call (int unadjusted_args_size, |
1730 | struct args_size *args_size, | |
95899b34 | 1731 | unsigned int preferred_unit_stack_boundary) |
739fb049 MM |
1732 | { |
1733 | /* The number of bytes to pop so that the stack will be | |
1734 | under-aligned by UNADJUSTED_ARGS_SIZE bytes. */ | |
1735 | HOST_WIDE_INT adjustment; | |
1736 | /* The alignment of the stack after the arguments are pushed, if we | |
1737 | just pushed the arguments without adjust the stack here. */ | |
95899b34 | 1738 | unsigned HOST_WIDE_INT unadjusted_alignment; |
739fb049 | 1739 | |
f725a3ec | 1740 | unadjusted_alignment |
739fb049 MM |
1741 | = ((stack_pointer_delta + unadjusted_args_size) |
1742 | % preferred_unit_stack_boundary); | |
1743 | ||
1744 | /* We want to get rid of as many of the PENDING_STACK_ADJUST bytes | |
1745 | as possible -- leaving just enough left to cancel out the | |
1746 | UNADJUSTED_ALIGNMENT. In other words, we want to ensure that the | |
1747 | PENDING_STACK_ADJUST is non-negative, and congruent to | |
1748 | -UNADJUSTED_ALIGNMENT modulo the PREFERRED_UNIT_STACK_BOUNDARY. */ | |
1749 | ||
1750 | /* Begin by trying to pop all the bytes. */ | |
f725a3ec KH |
1751 | unadjusted_alignment |
1752 | = (unadjusted_alignment | |
739fb049 MM |
1753 | - (pending_stack_adjust % preferred_unit_stack_boundary)); |
1754 | adjustment = pending_stack_adjust; | |
1755 | /* Push enough additional bytes that the stack will be aligned | |
1756 | after the arguments are pushed. */ | |
e079dcdb HB |
1757 | if (preferred_unit_stack_boundary > 1) |
1758 | { | |
3e555c7d | 1759 | if (unadjusted_alignment > 0) |
f725a3ec | 1760 | adjustment -= preferred_unit_stack_boundary - unadjusted_alignment; |
e079dcdb | 1761 | else |
f725a3ec | 1762 | adjustment += unadjusted_alignment; |
e079dcdb | 1763 | } |
f725a3ec | 1764 | |
739fb049 MM |
1765 | /* Now, sets ARGS_SIZE->CONSTANT so that we pop the right number of |
1766 | bytes after the call. The right number is the entire | |
1767 | PENDING_STACK_ADJUST less our ADJUSTMENT plus the amount required | |
1768 | by the arguments in the first place. */ | |
f725a3ec | 1769 | args_size->constant |
739fb049 MM |
1770 | = pending_stack_adjust - adjustment + unadjusted_args_size; |
1771 | ||
ce48579b | 1772 | return adjustment; |
739fb049 MM |
1773 | } |
1774 | ||
c67846f2 JJ |
1775 | /* Scan X expression if it does not dereference any argument slots |
1776 | we already clobbered by tail call arguments (as noted in stored_args_map | |
1777 | bitmap). | |
da7d8304 | 1778 | Return nonzero if X expression dereferences such argument slots, |
c67846f2 JJ |
1779 | zero otherwise. */ |
1780 | ||
1781 | static int | |
d329e058 | 1782 | check_sibcall_argument_overlap_1 (rtx x) |
c67846f2 JJ |
1783 | { |
1784 | RTX_CODE code; | |
1785 | int i, j; | |
c67846f2 JJ |
1786 | const char *fmt; |
1787 | ||
1788 | if (x == NULL_RTX) | |
1789 | return 0; | |
1790 | ||
1791 | code = GET_CODE (x); | |
1792 | ||
1793 | if (code == MEM) | |
07eef816 KH |
1794 | return mem_overlaps_already_clobbered_arg_p (XEXP (x, 0), |
1795 | GET_MODE_SIZE (GET_MODE (x))); | |
c67846f2 | 1796 | |
f725a3ec | 1797 | /* Scan all subexpressions. */ |
c67846f2 JJ |
1798 | fmt = GET_RTX_FORMAT (code); |
1799 | for (i = 0; i < GET_RTX_LENGTH (code); i++, fmt++) | |
1800 | { | |
1801 | if (*fmt == 'e') | |
f725a3ec KH |
1802 | { |
1803 | if (check_sibcall_argument_overlap_1 (XEXP (x, i))) | |
1804 | return 1; | |
1805 | } | |
c67846f2 | 1806 | else if (*fmt == 'E') |
f725a3ec KH |
1807 | { |
1808 | for (j = 0; j < XVECLEN (x, i); j++) | |
1809 | if (check_sibcall_argument_overlap_1 (XVECEXP (x, i, j))) | |
1810 | return 1; | |
1811 | } | |
c67846f2 JJ |
1812 | } |
1813 | return 0; | |
c67846f2 JJ |
1814 | } |
1815 | ||
1816 | /* Scan sequence after INSN if it does not dereference any argument slots | |
1817 | we already clobbered by tail call arguments (as noted in stored_args_map | |
0cdca92b DJ |
1818 | bitmap). If MARK_STORED_ARGS_MAP, add stack slots for ARG to |
1819 | stored_args_map bitmap afterwards (when ARG is a register MARK_STORED_ARGS_MAP | |
1820 | should be 0). Return nonzero if sequence after INSN dereferences such argument | |
1821 | slots, zero otherwise. */ | |
c67846f2 JJ |
1822 | |
1823 | static int | |
d329e058 | 1824 | check_sibcall_argument_overlap (rtx insn, struct arg_data *arg, int mark_stored_args_map) |
f725a3ec | 1825 | { |
c67846f2 JJ |
1826 | int low, high; |
1827 | ||
1828 | if (insn == NULL_RTX) | |
1829 | insn = get_insns (); | |
1830 | else | |
1831 | insn = NEXT_INSN (insn); | |
1832 | ||
1833 | for (; insn; insn = NEXT_INSN (insn)) | |
f725a3ec KH |
1834 | if (INSN_P (insn) |
1835 | && check_sibcall_argument_overlap_1 (PATTERN (insn))) | |
c67846f2 JJ |
1836 | break; |
1837 | ||
0cdca92b DJ |
1838 | if (mark_stored_args_map) |
1839 | { | |
d60eab50 | 1840 | #ifdef ARGS_GROW_DOWNWARD |
e7949876 | 1841 | low = -arg->locate.slot_offset.constant - arg->locate.size.constant; |
d60eab50 | 1842 | #else |
e7949876 | 1843 | low = arg->locate.slot_offset.constant; |
d60eab50 AO |
1844 | #endif |
1845 | ||
e7949876 | 1846 | for (high = low + arg->locate.size.constant; low < high; low++) |
0cdca92b DJ |
1847 | SET_BIT (stored_args_map, low); |
1848 | } | |
c67846f2 JJ |
1849 | return insn != NULL_RTX; |
1850 | } | |
1851 | ||
bef5d8b6 RS |
1852 | /* Given that a function returns a value of mode MODE at the most |
1853 | significant end of hard register VALUE, shift VALUE left or right | |
1854 | as specified by LEFT_P. Return true if some action was needed. */ | |
c988af2b | 1855 | |
bef5d8b6 RS |
1856 | bool |
1857 | shift_return_value (enum machine_mode mode, bool left_p, rtx value) | |
c988af2b | 1858 | { |
bef5d8b6 RS |
1859 | HOST_WIDE_INT shift; |
1860 | ||
1861 | gcc_assert (REG_P (value) && HARD_REGISTER_P (value)); | |
1862 | shift = GET_MODE_BITSIZE (GET_MODE (value)) - GET_MODE_BITSIZE (mode); | |
1863 | if (shift == 0) | |
1864 | return false; | |
1865 | ||
1866 | /* Use ashr rather than lshr for right shifts. This is for the benefit | |
1867 | of the MIPS port, which requires SImode values to be sign-extended | |
1868 | when stored in 64-bit registers. */ | |
1869 | if (!force_expand_binop (GET_MODE (value), left_p ? ashl_optab : ashr_optab, | |
1870 | value, GEN_INT (shift), value, 1, OPTAB_WIDEN)) | |
1871 | gcc_unreachable (); | |
1872 | return true; | |
c988af2b RS |
1873 | } |
1874 | ||
3fb30019 RS |
1875 | /* If X is a likely-spilled register value, copy it to a pseudo |
1876 | register and return that register. Return X otherwise. */ | |
1877 | ||
1878 | static rtx | |
1879 | avoid_likely_spilled_reg (rtx x) | |
1880 | { | |
82d6e6fc | 1881 | rtx new_rtx; |
3fb30019 RS |
1882 | |
1883 | if (REG_P (x) | |
1884 | && HARD_REGISTER_P (x) | |
1885 | && CLASS_LIKELY_SPILLED_P (REGNO_REG_CLASS (REGNO (x)))) | |
1886 | { | |
1887 | /* Make sure that we generate a REG rather than a CONCAT. | |
1888 | Moves into CONCATs can need nontrivial instructions, | |
1889 | and the whole point of this function is to avoid | |
1890 | using the hard register directly in such a situation. */ | |
1891 | generating_concat_p = 0; | |
82d6e6fc | 1892 | new_rtx = gen_reg_rtx (GET_MODE (x)); |
3fb30019 | 1893 | generating_concat_p = 1; |
82d6e6fc KG |
1894 | emit_move_insn (new_rtx, x); |
1895 | return new_rtx; | |
3fb30019 RS |
1896 | } |
1897 | return x; | |
1898 | } | |
1899 | ||
5039610b | 1900 | /* Generate all the code for a CALL_EXPR exp |
51bbfa0c RS |
1901 | and return an rtx for its value. |
1902 | Store the value in TARGET (specified as an rtx) if convenient. | |
1903 | If the value is stored in TARGET then TARGET is returned. | |
1904 | If IGNORE is nonzero, then we ignore the value of the function call. */ | |
1905 | ||
1906 | rtx | |
d329e058 | 1907 | expand_call (tree exp, rtx target, int ignore) |
51bbfa0c | 1908 | { |
0a1c58a2 JL |
1909 | /* Nonzero if we are currently expanding a call. */ |
1910 | static int currently_expanding_call = 0; | |
1911 | ||
51bbfa0c RS |
1912 | /* RTX for the function to be called. */ |
1913 | rtx funexp; | |
0a1c58a2 JL |
1914 | /* Sequence of insns to perform a normal "call". */ |
1915 | rtx normal_call_insns = NULL_RTX; | |
6de9cd9a | 1916 | /* Sequence of insns to perform a tail "call". */ |
0a1c58a2 | 1917 | rtx tail_call_insns = NULL_RTX; |
51bbfa0c RS |
1918 | /* Data type of the function. */ |
1919 | tree funtype; | |
ded9bf77 | 1920 | tree type_arg_types; |
28ed065e | 1921 | tree rettype; |
51bbfa0c RS |
1922 | /* Declaration of the function being called, |
1923 | or 0 if the function is computed (not known by name). */ | |
1924 | tree fndecl = 0; | |
57782ad8 MM |
1925 | /* The type of the function being called. */ |
1926 | tree fntype; | |
6de9cd9a | 1927 | bool try_tail_call = CALL_EXPR_TAILCALL (exp); |
0a1c58a2 | 1928 | int pass; |
51bbfa0c RS |
1929 | |
1930 | /* Register in which non-BLKmode value will be returned, | |
1931 | or 0 if no value or if value is BLKmode. */ | |
1932 | rtx valreg; | |
1933 | /* Address where we should return a BLKmode value; | |
1934 | 0 if value not BLKmode. */ | |
1935 | rtx structure_value_addr = 0; | |
1936 | /* Nonzero if that address is being passed by treating it as | |
1937 | an extra, implicit first parameter. Otherwise, | |
1938 | it is passed by being copied directly into struct_value_rtx. */ | |
1939 | int structure_value_addr_parm = 0; | |
078a18a4 SL |
1940 | /* Holds the value of implicit argument for the struct value. */ |
1941 | tree structure_value_addr_value = NULL_TREE; | |
51bbfa0c RS |
1942 | /* Size of aggregate value wanted, or zero if none wanted |
1943 | or if we are using the non-reentrant PCC calling convention | |
1944 | or expecting the value in registers. */ | |
e5e809f4 | 1945 | HOST_WIDE_INT struct_value_size = 0; |
51bbfa0c RS |
1946 | /* Nonzero if called function returns an aggregate in memory PCC style, |
1947 | by returning the address of where to find it. */ | |
1948 | int pcc_struct_value = 0; | |
61f71b34 | 1949 | rtx struct_value = 0; |
51bbfa0c RS |
1950 | |
1951 | /* Number of actual parameters in this call, including struct value addr. */ | |
1952 | int num_actuals; | |
1953 | /* Number of named args. Args after this are anonymous ones | |
1954 | and they must all go on the stack. */ | |
1955 | int n_named_args; | |
078a18a4 SL |
1956 | /* Number of complex actual arguments that need to be split. */ |
1957 | int num_complex_actuals = 0; | |
51bbfa0c RS |
1958 | |
1959 | /* Vector of information about each argument. | |
1960 | Arguments are numbered in the order they will be pushed, | |
1961 | not the order they are written. */ | |
1962 | struct arg_data *args; | |
1963 | ||
1964 | /* Total size in bytes of all the stack-parms scanned so far. */ | |
1965 | struct args_size args_size; | |
099e9712 | 1966 | struct args_size adjusted_args_size; |
51bbfa0c | 1967 | /* Size of arguments before any adjustments (such as rounding). */ |
599f37b6 | 1968 | int unadjusted_args_size; |
51bbfa0c RS |
1969 | /* Data on reg parms scanned so far. */ |
1970 | CUMULATIVE_ARGS args_so_far; | |
1971 | /* Nonzero if a reg parm has been scanned. */ | |
1972 | int reg_parm_seen; | |
efd65a8b | 1973 | /* Nonzero if this is an indirect function call. */ |
51bbfa0c | 1974 | |
f725a3ec | 1975 | /* Nonzero if we must avoid push-insns in the args for this call. |
51bbfa0c RS |
1976 | If stack space is allocated for register parameters, but not by the |
1977 | caller, then it is preallocated in the fixed part of the stack frame. | |
1978 | So the entire argument block must then be preallocated (i.e., we | |
1979 | ignore PUSH_ROUNDING in that case). */ | |
1980 | ||
f73ad30e | 1981 | int must_preallocate = !PUSH_ARGS; |
51bbfa0c | 1982 | |
f72aed24 | 1983 | /* Size of the stack reserved for parameter registers. */ |
6f90e075 JW |
1984 | int reg_parm_stack_space = 0; |
1985 | ||
51bbfa0c RS |
1986 | /* Address of space preallocated for stack parms |
1987 | (on machines that lack push insns), or 0 if space not preallocated. */ | |
1988 | rtx argblock = 0; | |
1989 | ||
f2d33f13 JH |
1990 | /* Mask of ECF_ flags. */ |
1991 | int flags = 0; | |
f73ad30e | 1992 | #ifdef REG_PARM_STACK_SPACE |
51bbfa0c | 1993 | /* Define the boundary of the register parm stack space that needs to be |
b820d2b8 AM |
1994 | saved, if any. */ |
1995 | int low_to_save, high_to_save; | |
51bbfa0c RS |
1996 | rtx save_area = 0; /* Place that it is saved */ |
1997 | #endif | |
1998 | ||
51bbfa0c RS |
1999 | int initial_highest_arg_in_use = highest_outgoing_arg_in_use; |
2000 | char *initial_stack_usage_map = stack_usage_map; | |
d9725c41 | 2001 | char *stack_usage_map_buf = NULL; |
51bbfa0c | 2002 | |
38afb23f OH |
2003 | int old_stack_allocated; |
2004 | ||
2005 | /* State variables to track stack modifications. */ | |
51bbfa0c | 2006 | rtx old_stack_level = 0; |
38afb23f | 2007 | int old_stack_arg_under_construction = 0; |
79be3418 | 2008 | int old_pending_adj = 0; |
51bbfa0c | 2009 | int old_inhibit_defer_pop = inhibit_defer_pop; |
38afb23f OH |
2010 | |
2011 | /* Some stack pointer alterations we make are performed via | |
2012 | allocate_dynamic_stack_space. This modifies the stack_pointer_delta, | |
2013 | which we then also need to save/restore along the way. */ | |
a259f218 | 2014 | int old_stack_pointer_delta = 0; |
38afb23f | 2015 | |
0a1c58a2 | 2016 | rtx call_fusage; |
5039610b | 2017 | tree addr = CALL_EXPR_FN (exp); |
b3694847 | 2018 | int i; |
739fb049 | 2019 | /* The alignment of the stack, in bits. */ |
95899b34 | 2020 | unsigned HOST_WIDE_INT preferred_stack_boundary; |
739fb049 | 2021 | /* The alignment of the stack, in bytes. */ |
95899b34 | 2022 | unsigned HOST_WIDE_INT preferred_unit_stack_boundary; |
6de9cd9a DN |
2023 | /* The static chain value to use for this call. */ |
2024 | rtx static_chain_value; | |
f2d33f13 JH |
2025 | /* See if this is "nothrow" function call. */ |
2026 | if (TREE_NOTHROW (exp)) | |
2027 | flags |= ECF_NOTHROW; | |
2028 | ||
6de9cd9a DN |
2029 | /* See if we can find a DECL-node for the actual function, and get the |
2030 | function attributes (flags) from the function decl or type node. */ | |
39b0dce7 JM |
2031 | fndecl = get_callee_fndecl (exp); |
2032 | if (fndecl) | |
51bbfa0c | 2033 | { |
57782ad8 | 2034 | fntype = TREE_TYPE (fndecl); |
39b0dce7 | 2035 | flags |= flags_from_decl_or_type (fndecl); |
51bbfa0c | 2036 | } |
39b0dce7 | 2037 | else |
72954a4f | 2038 | { |
28ed065e | 2039 | fntype = TREE_TYPE (TREE_TYPE (addr)); |
57782ad8 | 2040 | flags |= flags_from_decl_or_type (fntype); |
72954a4f | 2041 | } |
28ed065e | 2042 | rettype = TREE_TYPE (exp); |
7393c642 | 2043 | |
57782ad8 | 2044 | struct_value = targetm.calls.struct_value_rtx (fntype, 0); |
61f71b34 | 2045 | |
8c6a8269 RS |
2046 | /* Warn if this value is an aggregate type, |
2047 | regardless of which calling convention we are using for it. */ | |
28ed065e | 2048 | if (AGGREGATE_TYPE_P (rettype)) |
ccf08a6e | 2049 | warning (OPT_Waggregate_return, "function call has aggregate value"); |
8c6a8269 | 2050 | |
becfd6e5 KZ |
2051 | /* If the result of a non looping pure or const function call is |
2052 | ignored (or void), and none of its arguments are volatile, we can | |
2053 | avoid expanding the call and just evaluate the arguments for | |
2054 | side-effects. */ | |
8c6a8269 | 2055 | if ((flags & (ECF_CONST | ECF_PURE)) |
becfd6e5 | 2056 | && (!(flags & ECF_LOOPING_CONST_OR_PURE)) |
8c6a8269 | 2057 | && (ignore || target == const0_rtx |
28ed065e | 2058 | || TYPE_MODE (rettype) == VOIDmode)) |
8c6a8269 RS |
2059 | { |
2060 | bool volatilep = false; | |
2061 | tree arg; | |
078a18a4 | 2062 | call_expr_arg_iterator iter; |
8c6a8269 | 2063 | |
078a18a4 SL |
2064 | FOR_EACH_CALL_EXPR_ARG (arg, iter, exp) |
2065 | if (TREE_THIS_VOLATILE (arg)) | |
8c6a8269 RS |
2066 | { |
2067 | volatilep = true; | |
2068 | break; | |
2069 | } | |
2070 | ||
2071 | if (! volatilep) | |
2072 | { | |
078a18a4 SL |
2073 | FOR_EACH_CALL_EXPR_ARG (arg, iter, exp) |
2074 | expand_expr (arg, const0_rtx, VOIDmode, EXPAND_NORMAL); | |
8c6a8269 RS |
2075 | return const0_rtx; |
2076 | } | |
2077 | } | |
2078 | ||
6f90e075 | 2079 | #ifdef REG_PARM_STACK_SPACE |
5d059ed9 | 2080 | reg_parm_stack_space = REG_PARM_STACK_SPACE (!fndecl ? fntype : fndecl); |
6f90e075 | 2081 | #endif |
6f90e075 | 2082 | |
5d059ed9 | 2083 | if (! OUTGOING_REG_PARM_STACK_SPACE ((!fndecl ? fntype : TREE_TYPE (fndecl))) |
81464b2c | 2084 | && reg_parm_stack_space > 0 && PUSH_ARGS) |
e5e809f4 | 2085 | must_preallocate = 1; |
e5e809f4 | 2086 | |
51bbfa0c RS |
2087 | /* Set up a place to return a structure. */ |
2088 | ||
2089 | /* Cater to broken compilers. */ | |
45769134 | 2090 | if (aggregate_value_p (exp, (!fndecl ? fntype : fndecl))) |
51bbfa0c RS |
2091 | { |
2092 | /* This call returns a big structure. */ | |
84b8030f | 2093 | flags &= ~(ECF_CONST | ECF_PURE | ECF_LOOPING_CONST_OR_PURE); |
51bbfa0c RS |
2094 | |
2095 | #ifdef PCC_STATIC_STRUCT_RETURN | |
9e7b1d0a RS |
2096 | { |
2097 | pcc_struct_value = 1; | |
9e7b1d0a RS |
2098 | } |
2099 | #else /* not PCC_STATIC_STRUCT_RETURN */ | |
2100 | { | |
28ed065e | 2101 | struct_value_size = int_size_in_bytes (rettype); |
51bbfa0c | 2102 | |
fa47911c | 2103 | if (target && MEM_P (target) && CALL_EXPR_RETURN_SLOT_OPT (exp)) |
9e7b1d0a RS |
2104 | structure_value_addr = XEXP (target, 0); |
2105 | else | |
2106 | { | |
9e7b1d0a RS |
2107 | /* For variable-sized objects, we must be called with a target |
2108 | specified. If we were to allocate space on the stack here, | |
2109 | we would have no way of knowing when to free it. */ | |
28ed065e | 2110 | rtx d = assign_temp (rettype, 0, 1, 1); |
51bbfa0c | 2111 | |
4361b41d MM |
2112 | mark_temp_addr_taken (d); |
2113 | structure_value_addr = XEXP (d, 0); | |
9e7b1d0a RS |
2114 | target = 0; |
2115 | } | |
2116 | } | |
2117 | #endif /* not PCC_STATIC_STRUCT_RETURN */ | |
51bbfa0c RS |
2118 | } |
2119 | ||
099e9712 | 2120 | /* Figure out the amount to which the stack should be aligned. */ |
099e9712 | 2121 | preferred_stack_boundary = PREFERRED_STACK_BOUNDARY; |
b255a036 JH |
2122 | if (fndecl) |
2123 | { | |
2124 | struct cgraph_rtl_info *i = cgraph_rtl_info (fndecl); | |
17b29c0a L |
2125 | /* Without automatic stack alignment, we can't increase preferred |
2126 | stack boundary. With automatic stack alignment, it is | |
2127 | unnecessary since unless we can guarantee that all callers will | |
2128 | align the outgoing stack properly, callee has to align its | |
2129 | stack anyway. */ | |
2130 | if (i | |
2131 | && i->preferred_incoming_stack_boundary | |
2132 | && i->preferred_incoming_stack_boundary < preferred_stack_boundary) | |
b255a036 JH |
2133 | preferred_stack_boundary = i->preferred_incoming_stack_boundary; |
2134 | } | |
099e9712 JH |
2135 | |
2136 | /* Operand 0 is a pointer-to-function; get the type of the function. */ | |
09e2bf48 | 2137 | funtype = TREE_TYPE (addr); |
366de0ce | 2138 | gcc_assert (POINTER_TYPE_P (funtype)); |
099e9712 JH |
2139 | funtype = TREE_TYPE (funtype); |
2140 | ||
078a18a4 SL |
2141 | /* Count whether there are actual complex arguments that need to be split |
2142 | into their real and imaginary parts. Munge the type_arg_types | |
2143 | appropriately here as well. */ | |
42ba5130 | 2144 | if (targetm.calls.split_complex_arg) |
ded9bf77 | 2145 | { |
078a18a4 SL |
2146 | call_expr_arg_iterator iter; |
2147 | tree arg; | |
2148 | FOR_EACH_CALL_EXPR_ARG (arg, iter, exp) | |
2149 | { | |
2150 | tree type = TREE_TYPE (arg); | |
2151 | if (type && TREE_CODE (type) == COMPLEX_TYPE | |
2152 | && targetm.calls.split_complex_arg (type)) | |
2153 | num_complex_actuals++; | |
2154 | } | |
ded9bf77 | 2155 | type_arg_types = split_complex_types (TYPE_ARG_TYPES (funtype)); |
ded9bf77 AH |
2156 | } |
2157 | else | |
2158 | type_arg_types = TYPE_ARG_TYPES (funtype); | |
2159 | ||
099e9712 | 2160 | if (flags & ECF_MAY_BE_ALLOCA) |
e3b5732b | 2161 | cfun->calls_alloca = 1; |
099e9712 JH |
2162 | |
2163 | /* If struct_value_rtx is 0, it means pass the address | |
078a18a4 SL |
2164 | as if it were an extra parameter. Put the argument expression |
2165 | in structure_value_addr_value. */ | |
61f71b34 | 2166 | if (structure_value_addr && struct_value == 0) |
099e9712 JH |
2167 | { |
2168 | /* If structure_value_addr is a REG other than | |
2169 | virtual_outgoing_args_rtx, we can use always use it. If it | |
2170 | is not a REG, we must always copy it into a register. | |
2171 | If it is virtual_outgoing_args_rtx, we must copy it to another | |
2172 | register in some cases. */ | |
f8cfc6aa | 2173 | rtx temp = (!REG_P (structure_value_addr) |
099e9712 JH |
2174 | || (ACCUMULATE_OUTGOING_ARGS |
2175 | && stack_arg_under_construction | |
2176 | && structure_value_addr == virtual_outgoing_args_rtx) | |
7ae4ad28 | 2177 | ? copy_addr_to_reg (convert_memory_address |
57782ad8 | 2178 | (Pmode, structure_value_addr)) |
099e9712 JH |
2179 | : structure_value_addr); |
2180 | ||
078a18a4 SL |
2181 | structure_value_addr_value = |
2182 | make_tree (build_pointer_type (TREE_TYPE (funtype)), temp); | |
099e9712 JH |
2183 | structure_value_addr_parm = 1; |
2184 | } | |
2185 | ||
2186 | /* Count the arguments and set NUM_ACTUALS. */ | |
078a18a4 SL |
2187 | num_actuals = |
2188 | call_expr_nargs (exp) + num_complex_actuals + structure_value_addr_parm; | |
099e9712 JH |
2189 | |
2190 | /* Compute number of named args. | |
3a4d587b AM |
2191 | First, do a raw count of the args for INIT_CUMULATIVE_ARGS. */ |
2192 | ||
2193 | if (type_arg_types != 0) | |
2194 | n_named_args | |
2195 | = (list_length (type_arg_types) | |
2196 | /* Count the struct value address, if it is passed as a parm. */ | |
2197 | + structure_value_addr_parm); | |
2198 | else | |
2199 | /* If we know nothing, treat all args as named. */ | |
2200 | n_named_args = num_actuals; | |
2201 | ||
2202 | /* Start updating where the next arg would go. | |
2203 | ||
2204 | On some machines (such as the PA) indirect calls have a different | |
2205 | calling convention than normal calls. The fourth argument in | |
2206 | INIT_CUMULATIVE_ARGS tells the backend if this is an indirect call | |
2207 | or not. */ | |
2208 | INIT_CUMULATIVE_ARGS (args_so_far, funtype, NULL_RTX, fndecl, n_named_args); | |
2209 | ||
2210 | /* Now possibly adjust the number of named args. | |
099e9712 | 2211 | Normally, don't include the last named arg if anonymous args follow. |
3a179764 KH |
2212 | We do include the last named arg if |
2213 | targetm.calls.strict_argument_naming() returns nonzero. | |
099e9712 JH |
2214 | (If no anonymous args follow, the result of list_length is actually |
2215 | one too large. This is harmless.) | |
2216 | ||
4ac8340c | 2217 | If targetm.calls.pretend_outgoing_varargs_named() returns |
3a179764 KH |
2218 | nonzero, and targetm.calls.strict_argument_naming() returns zero, |
2219 | this machine will be able to place unnamed args that were passed | |
2220 | in registers into the stack. So treat all args as named. This | |
2221 | allows the insns emitting for a specific argument list to be | |
2222 | independent of the function declaration. | |
4ac8340c KH |
2223 | |
2224 | If targetm.calls.pretend_outgoing_varargs_named() returns zero, | |
2225 | we do not have any reliable way to pass unnamed args in | |
2226 | registers, so we must force them into memory. */ | |
099e9712 | 2227 | |
3a4d587b AM |
2228 | if (type_arg_types != 0 |
2229 | && targetm.calls.strict_argument_naming (&args_so_far)) | |
2230 | ; | |
2231 | else if (type_arg_types != 0 | |
2232 | && ! targetm.calls.pretend_outgoing_varargs_named (&args_so_far)) | |
2233 | /* Don't include the last named arg. */ | |
2234 | --n_named_args; | |
099e9712 | 2235 | else |
3a4d587b | 2236 | /* Treat all args as named. */ |
099e9712 JH |
2237 | n_named_args = num_actuals; |
2238 | ||
099e9712 | 2239 | /* Make a vector to hold all the information about each arg. */ |
f883e0a7 | 2240 | args = XALLOCAVEC (struct arg_data, num_actuals); |
703ad42b | 2241 | memset (args, 0, num_actuals * sizeof (struct arg_data)); |
099e9712 | 2242 | |
d80d2d2a KH |
2243 | /* Build up entries in the ARGS array, compute the size of the |
2244 | arguments into ARGS_SIZE, etc. */ | |
099e9712 | 2245 | initialize_argument_information (num_actuals, args, &args_size, |
078a18a4 | 2246 | n_named_args, exp, |
45769134 | 2247 | structure_value_addr_value, fndecl, fntype, |
099e9712 JH |
2248 | &args_so_far, reg_parm_stack_space, |
2249 | &old_stack_level, &old_pending_adj, | |
dd292d0a | 2250 | &must_preallocate, &flags, |
6de9cd9a | 2251 | &try_tail_call, CALL_FROM_THUNK_P (exp)); |
099e9712 JH |
2252 | |
2253 | if (args_size.var) | |
84b8030f | 2254 | must_preallocate = 1; |
099e9712 JH |
2255 | |
2256 | /* Now make final decision about preallocating stack space. */ | |
2257 | must_preallocate = finalize_must_preallocate (must_preallocate, | |
2258 | num_actuals, args, | |
2259 | &args_size); | |
2260 | ||
2261 | /* If the structure value address will reference the stack pointer, we | |
2262 | must stabilize it. We don't need to do this if we know that we are | |
2263 | not going to adjust the stack pointer in processing this call. */ | |
2264 | ||
2265 | if (structure_value_addr | |
2266 | && (reg_mentioned_p (virtual_stack_dynamic_rtx, structure_value_addr) | |
2267 | || reg_mentioned_p (virtual_outgoing_args_rtx, | |
2268 | structure_value_addr)) | |
2269 | && (args_size.var | |
2270 | || (!ACCUMULATE_OUTGOING_ARGS && args_size.constant))) | |
2271 | structure_value_addr = copy_to_reg (structure_value_addr); | |
0a1c58a2 | 2272 | |
7ae4ad28 | 2273 | /* Tail calls can make things harder to debug, and we've traditionally |
194c7c45 | 2274 | pushed these optimizations into -O2. Don't try if we're already |
fb158467 | 2275 | expanding a call, as that means we're an argument. Don't try if |
3fbd86b1 | 2276 | there's cleanups, as we know there's code to follow the call. */ |
0a1c58a2 | 2277 | |
099e9712 JH |
2278 | if (currently_expanding_call++ != 0 |
2279 | || !flag_optimize_sibling_calls | |
6de9cd9a | 2280 | || args_size.var |
6fb5fa3c | 2281 | || dbg_cnt (tail_call) == false) |
6de9cd9a | 2282 | try_tail_call = 0; |
099e9712 JH |
2283 | |
2284 | /* Rest of purposes for tail call optimizations to fail. */ | |
2285 | if ( | |
2286 | #ifdef HAVE_sibcall_epilogue | |
2287 | !HAVE_sibcall_epilogue | |
2288 | #else | |
2289 | 1 | |
2290 | #endif | |
2291 | || !try_tail_call | |
2292 | /* Doing sibling call optimization needs some work, since | |
2293 | structure_value_addr can be allocated on the stack. | |
2294 | It does not seem worth the effort since few optimizable | |
2295 | sibling calls will return a structure. */ | |
2296 | || structure_value_addr != NULL_RTX | |
130423d7 | 2297 | #ifdef REG_PARM_STACK_SPACE |
0e456625 JH |
2298 | /* If outgoing reg parm stack space changes, we can not do sibcall. */ |
2299 | || (OUTGOING_REG_PARM_STACK_SPACE (funtype) | |
2300 | != OUTGOING_REG_PARM_STACK_SPACE (TREE_TYPE (current_function_decl))) | |
2301 | || (reg_parm_stack_space != REG_PARM_STACK_SPACE (fndecl)) | |
130423d7 | 2302 | #endif |
4977bab6 ZW |
2303 | /* Check whether the target is able to optimize the call |
2304 | into a sibcall. */ | |
5fd9b178 | 2305 | || !targetm.function_ok_for_sibcall (fndecl, exp) |
4977bab6 | 2306 | /* Functions that do not return exactly once may not be sibcall |
c22cacf3 | 2307 | optimized. */ |
6e14af16 | 2308 | || (flags & (ECF_RETURNS_TWICE | ECF_NORETURN)) |
09e2bf48 | 2309 | || TYPE_VOLATILE (TREE_TYPE (TREE_TYPE (addr))) |
6a48df45 | 2310 | /* If the called function is nested in the current one, it might access |
c22cacf3 MS |
2311 | some of the caller's arguments, but could clobber them beforehand if |
2312 | the argument areas are shared. */ | |
6a48df45 | 2313 | || (fndecl && decl_function_context (fndecl) == current_function_decl) |
099e9712 | 2314 | /* If this function requires more stack slots than the current |
ff7f012a | 2315 | function, we cannot change it into a sibling call. |
38173d38 | 2316 | crtl->args.pretend_args_size is not part of the |
ff7f012a | 2317 | stack allocated by our caller. */ |
38173d38 JH |
2318 | || args_size.constant > (crtl->args.size |
2319 | - crtl->args.pretend_args_size) | |
099e9712 JH |
2320 | /* If the callee pops its own arguments, then it must pop exactly |
2321 | the same number of arguments as the current function. */ | |
e076f71a AH |
2322 | || (RETURN_POPS_ARGS (fndecl, funtype, args_size.constant) |
2323 | != RETURN_POPS_ARGS (current_function_decl, | |
2324 | TREE_TYPE (current_function_decl), | |
38173d38 | 2325 | crtl->args.size)) |
ae2bcd98 | 2326 | || !lang_hooks.decls.ok_for_sibcall (fndecl)) |
e6f64875 | 2327 | try_tail_call = 0; |
497eb8c3 | 2328 | |
c69cd1f5 JJ |
2329 | /* Check if caller and callee disagree in promotion of function |
2330 | return value. */ | |
2331 | if (try_tail_call) | |
2332 | { | |
2333 | enum machine_mode caller_mode, caller_promoted_mode; | |
2334 | enum machine_mode callee_mode, callee_promoted_mode; | |
2335 | int caller_unsignedp, callee_unsignedp; | |
2336 | tree caller_res = DECL_RESULT (current_function_decl); | |
2337 | ||
2338 | caller_unsignedp = TYPE_UNSIGNED (TREE_TYPE (caller_res)); | |
cde0f3fd | 2339 | caller_mode = DECL_MODE (caller_res); |
c69cd1f5 | 2340 | callee_unsignedp = TYPE_UNSIGNED (TREE_TYPE (funtype)); |
cde0f3fd PB |
2341 | callee_mode = TYPE_MODE (TREE_TYPE (funtype)); |
2342 | caller_promoted_mode | |
2343 | = promote_function_mode (TREE_TYPE (caller_res), caller_mode, | |
2344 | &caller_unsignedp, | |
2345 | TREE_TYPE (current_function_decl), 1); | |
2346 | callee_promoted_mode | |
666e3ceb | 2347 | = promote_function_mode (TREE_TYPE (funtype), callee_mode, |
cde0f3fd | 2348 | &callee_unsignedp, |
666e3ceb | 2349 | funtype, 1); |
c69cd1f5 JJ |
2350 | if (caller_mode != VOIDmode |
2351 | && (caller_promoted_mode != callee_promoted_mode | |
2352 | || ((caller_mode != caller_promoted_mode | |
2353 | || callee_mode != callee_promoted_mode) | |
2354 | && (caller_unsignedp != callee_unsignedp | |
2355 | || GET_MODE_BITSIZE (caller_mode) | |
2356 | < GET_MODE_BITSIZE (callee_mode))))) | |
2357 | try_tail_call = 0; | |
2358 | } | |
2359 | ||
01973e26 L |
2360 | /* Ensure current function's preferred stack boundary is at least |
2361 | what we need. Stack alignment may also increase preferred stack | |
2362 | boundary. */ | |
b5f772ce | 2363 | if (crtl->preferred_stack_boundary < preferred_stack_boundary) |
cb91fab0 | 2364 | crtl->preferred_stack_boundary = preferred_stack_boundary; |
01973e26 L |
2365 | else |
2366 | preferred_stack_boundary = crtl->preferred_stack_boundary; | |
c2f8b491 | 2367 | |
099e9712 | 2368 | preferred_unit_stack_boundary = preferred_stack_boundary / BITS_PER_UNIT; |
497eb8c3 | 2369 | |
0a1c58a2 JL |
2370 | /* We want to make two insn chains; one for a sibling call, the other |
2371 | for a normal call. We will select one of the two chains after | |
2372 | initial RTL generation is complete. */ | |
b820d2b8 | 2373 | for (pass = try_tail_call ? 0 : 1; pass < 2; pass++) |
0a1c58a2 JL |
2374 | { |
2375 | int sibcall_failure = 0; | |
f5143c46 | 2376 | /* We want to emit any pending stack adjustments before the tail |
0a1c58a2 | 2377 | recursion "call". That way we know any adjustment after the tail |
7ae4ad28 | 2378 | recursion call can be ignored if we indeed use the tail |
0a1c58a2 | 2379 | call expansion. */ |
5ac9118e KG |
2380 | int save_pending_stack_adjust = 0; |
2381 | int save_stack_pointer_delta = 0; | |
0a1c58a2 | 2382 | rtx insns; |
05e6ee93 | 2383 | rtx before_call, next_arg_reg, after_args; |
39842893 | 2384 | |
0a1c58a2 JL |
2385 | if (pass == 0) |
2386 | { | |
0a1c58a2 JL |
2387 | /* State variables we need to save and restore between |
2388 | iterations. */ | |
2389 | save_pending_stack_adjust = pending_stack_adjust; | |
1503a7ec | 2390 | save_stack_pointer_delta = stack_pointer_delta; |
0a1c58a2 | 2391 | } |
f2d33f13 JH |
2392 | if (pass) |
2393 | flags &= ~ECF_SIBCALL; | |
2394 | else | |
2395 | flags |= ECF_SIBCALL; | |
51bbfa0c | 2396 | |
0a1c58a2 | 2397 | /* Other state variables that we must reinitialize each time |
f2d33f13 | 2398 | through the loop (that are not initialized by the loop itself). */ |
0a1c58a2 JL |
2399 | argblock = 0; |
2400 | call_fusage = 0; | |
fa76d9e0 | 2401 | |
f725a3ec | 2402 | /* Start a new sequence for the normal call case. |
51bbfa0c | 2403 | |
0a1c58a2 JL |
2404 | From this point on, if the sibling call fails, we want to set |
2405 | sibcall_failure instead of continuing the loop. */ | |
2406 | start_sequence (); | |
eecb6f50 | 2407 | |
0a1c58a2 JL |
2408 | /* Don't let pending stack adjusts add up to too much. |
2409 | Also, do all pending adjustments now if there is any chance | |
2410 | this might be a call to alloca or if we are expanding a sibling | |
9dd9bf80 | 2411 | call sequence. |
63579539 DJ |
2412 | Also do the adjustments before a throwing call, otherwise |
2413 | exception handling can fail; PR 19225. */ | |
0a1c58a2 | 2414 | if (pending_stack_adjust >= 32 |
b5cd4ed4 | 2415 | || (pending_stack_adjust > 0 |
9dd9bf80 | 2416 | && (flags & ECF_MAY_BE_ALLOCA)) |
63579539 DJ |
2417 | || (pending_stack_adjust > 0 |
2418 | && flag_exceptions && !(flags & ECF_NOTHROW)) | |
0a1c58a2 JL |
2419 | || pass == 0) |
2420 | do_pending_stack_adjust (); | |
51bbfa0c | 2421 | |
0a1c58a2 | 2422 | /* Precompute any arguments as needed. */ |
f8a097cd | 2423 | if (pass) |
84b8030f | 2424 | precompute_arguments (num_actuals, args); |
51bbfa0c | 2425 | |
0a1c58a2 JL |
2426 | /* Now we are about to start emitting insns that can be deleted |
2427 | if a libcall is deleted. */ | |
84b8030f | 2428 | if (pass && (flags & ECF_MALLOC)) |
0a1c58a2 | 2429 | start_sequence (); |
51bbfa0c | 2430 | |
cb91fab0 | 2431 | if (pass == 0 && crtl->stack_protect_guard) |
b755446c RH |
2432 | stack_protect_epilogue (); |
2433 | ||
099e9712 | 2434 | adjusted_args_size = args_size; |
ce48579b RH |
2435 | /* Compute the actual size of the argument block required. The variable |
2436 | and constant sizes must be combined, the size may have to be rounded, | |
2437 | and there may be a minimum required size. When generating a sibcall | |
2438 | pattern, do not round up, since we'll be re-using whatever space our | |
2439 | caller provided. */ | |
2440 | unadjusted_args_size | |
f725a3ec KH |
2441 | = compute_argument_block_size (reg_parm_stack_space, |
2442 | &adjusted_args_size, | |
5d059ed9 | 2443 | fndecl, fntype, |
ce48579b RH |
2444 | (pass == 0 ? 0 |
2445 | : preferred_stack_boundary)); | |
2446 | ||
f725a3ec | 2447 | old_stack_allocated = stack_pointer_delta - pending_stack_adjust; |
ce48579b | 2448 | |
f8a097cd | 2449 | /* The argument block when performing a sibling call is the |
c22cacf3 | 2450 | incoming argument block. */ |
f8a097cd | 2451 | if (pass == 0) |
c67846f2 | 2452 | { |
2e3f842f | 2453 | argblock = crtl->args.internal_arg_pointer; |
fcae219a R |
2454 | argblock |
2455 | #ifdef STACK_GROWS_DOWNWARD | |
38173d38 | 2456 | = plus_constant (argblock, crtl->args.pretend_args_size); |
fcae219a | 2457 | #else |
38173d38 | 2458 | = plus_constant (argblock, -crtl->args.pretend_args_size); |
fcae219a | 2459 | #endif |
c67846f2 JJ |
2460 | stored_args_map = sbitmap_alloc (args_size.constant); |
2461 | sbitmap_zero (stored_args_map); | |
2462 | } | |
ce48579b | 2463 | |
0a1c58a2 JL |
2464 | /* If we have no actual push instructions, or shouldn't use them, |
2465 | make space for all args right now. */ | |
099e9712 | 2466 | else if (adjusted_args_size.var != 0) |
51bbfa0c | 2467 | { |
0a1c58a2 JL |
2468 | if (old_stack_level == 0) |
2469 | { | |
2470 | emit_stack_save (SAVE_BLOCK, &old_stack_level, NULL_RTX); | |
38afb23f | 2471 | old_stack_pointer_delta = stack_pointer_delta; |
0a1c58a2 JL |
2472 | old_pending_adj = pending_stack_adjust; |
2473 | pending_stack_adjust = 0; | |
0a1c58a2 JL |
2474 | /* stack_arg_under_construction says whether a stack arg is |
2475 | being constructed at the old stack level. Pushing the stack | |
2476 | gets a clean outgoing argument block. */ | |
2477 | old_stack_arg_under_construction = stack_arg_under_construction; | |
2478 | stack_arg_under_construction = 0; | |
0a1c58a2 | 2479 | } |
099e9712 | 2480 | argblock = push_block (ARGS_SIZE_RTX (adjusted_args_size), 0, 0); |
51bbfa0c | 2481 | } |
0a1c58a2 JL |
2482 | else |
2483 | { | |
2484 | /* Note that we must go through the motions of allocating an argument | |
2485 | block even if the size is zero because we may be storing args | |
2486 | in the area reserved for register arguments, which may be part of | |
2487 | the stack frame. */ | |
26a258fe | 2488 | |
099e9712 | 2489 | int needed = adjusted_args_size.constant; |
51bbfa0c | 2490 | |
0a1c58a2 JL |
2491 | /* Store the maximum argument space used. It will be pushed by |
2492 | the prologue (if ACCUMULATE_OUTGOING_ARGS, or stack overflow | |
2493 | checking). */ | |
51bbfa0c | 2494 | |
38173d38 JH |
2495 | if (needed > crtl->outgoing_args_size) |
2496 | crtl->outgoing_args_size = needed; | |
51bbfa0c | 2497 | |
0a1c58a2 JL |
2498 | if (must_preallocate) |
2499 | { | |
f73ad30e JH |
2500 | if (ACCUMULATE_OUTGOING_ARGS) |
2501 | { | |
f8a097cd JH |
2502 | /* Since the stack pointer will never be pushed, it is |
2503 | possible for the evaluation of a parm to clobber | |
2504 | something we have already written to the stack. | |
2505 | Since most function calls on RISC machines do not use | |
2506 | the stack, this is uncommon, but must work correctly. | |
26a258fe | 2507 | |
f73ad30e | 2508 | Therefore, we save any area of the stack that was already |
f8a097cd JH |
2509 | written and that we are using. Here we set up to do this |
2510 | by making a new stack usage map from the old one. The | |
f725a3ec | 2511 | actual save will be done by store_one_arg. |
26a258fe | 2512 | |
f73ad30e JH |
2513 | Another approach might be to try to reorder the argument |
2514 | evaluations to avoid this conflicting stack usage. */ | |
26a258fe | 2515 | |
f8a097cd JH |
2516 | /* Since we will be writing into the entire argument area, |
2517 | the map must be allocated for its entire size, not just | |
2518 | the part that is the responsibility of the caller. */ | |
5d059ed9 | 2519 | if (! OUTGOING_REG_PARM_STACK_SPACE ((!fndecl ? fntype : TREE_TYPE (fndecl)))) |
ac294f0b | 2520 | needed += reg_parm_stack_space; |
51bbfa0c RS |
2521 | |
2522 | #ifdef ARGS_GROW_DOWNWARD | |
f73ad30e JH |
2523 | highest_outgoing_arg_in_use = MAX (initial_highest_arg_in_use, |
2524 | needed + 1); | |
51bbfa0c | 2525 | #else |
f73ad30e JH |
2526 | highest_outgoing_arg_in_use = MAX (initial_highest_arg_in_use, |
2527 | needed); | |
51bbfa0c | 2528 | #endif |
d9725c41 JJ |
2529 | if (stack_usage_map_buf) |
2530 | free (stack_usage_map_buf); | |
5ed6ace5 | 2531 | stack_usage_map_buf = XNEWVEC (char, highest_outgoing_arg_in_use); |
d9725c41 | 2532 | stack_usage_map = stack_usage_map_buf; |
51bbfa0c | 2533 | |
f73ad30e | 2534 | if (initial_highest_arg_in_use) |
2e09e75a JM |
2535 | memcpy (stack_usage_map, initial_stack_usage_map, |
2536 | initial_highest_arg_in_use); | |
2f4aa534 | 2537 | |
f73ad30e | 2538 | if (initial_highest_arg_in_use != highest_outgoing_arg_in_use) |
961192e1 | 2539 | memset (&stack_usage_map[initial_highest_arg_in_use], 0, |
f73ad30e JH |
2540 | (highest_outgoing_arg_in_use |
2541 | - initial_highest_arg_in_use)); | |
2542 | needed = 0; | |
2f4aa534 | 2543 | |
f8a097cd JH |
2544 | /* The address of the outgoing argument list must not be |
2545 | copied to a register here, because argblock would be left | |
2546 | pointing to the wrong place after the call to | |
f725a3ec | 2547 | allocate_dynamic_stack_space below. */ |
2f4aa534 | 2548 | |
f73ad30e | 2549 | argblock = virtual_outgoing_args_rtx; |
f725a3ec | 2550 | } |
f73ad30e | 2551 | else |
26a258fe | 2552 | { |
f73ad30e | 2553 | if (inhibit_defer_pop == 0) |
0a1c58a2 | 2554 | { |
f73ad30e | 2555 | /* Try to reuse some or all of the pending_stack_adjust |
ce48579b RH |
2556 | to get this space. */ |
2557 | needed | |
f725a3ec | 2558 | = (combine_pending_stack_adjustment_and_call |
ce48579b | 2559 | (unadjusted_args_size, |
099e9712 | 2560 | &adjusted_args_size, |
ce48579b RH |
2561 | preferred_unit_stack_boundary)); |
2562 | ||
2563 | /* combine_pending_stack_adjustment_and_call computes | |
2564 | an adjustment before the arguments are allocated. | |
2565 | Account for them and see whether or not the stack | |
2566 | needs to go up or down. */ | |
2567 | needed = unadjusted_args_size - needed; | |
2568 | ||
2569 | if (needed < 0) | |
f73ad30e | 2570 | { |
ce48579b RH |
2571 | /* We're releasing stack space. */ |
2572 | /* ??? We can avoid any adjustment at all if we're | |
2573 | already aligned. FIXME. */ | |
2574 | pending_stack_adjust = -needed; | |
2575 | do_pending_stack_adjust (); | |
f73ad30e JH |
2576 | needed = 0; |
2577 | } | |
f725a3ec | 2578 | else |
ce48579b RH |
2579 | /* We need to allocate space. We'll do that in |
2580 | push_block below. */ | |
2581 | pending_stack_adjust = 0; | |
0a1c58a2 | 2582 | } |
ce48579b RH |
2583 | |
2584 | /* Special case this because overhead of `push_block' in | |
2585 | this case is non-trivial. */ | |
f73ad30e JH |
2586 | if (needed == 0) |
2587 | argblock = virtual_outgoing_args_rtx; | |
0a1c58a2 | 2588 | else |
d892f288 DD |
2589 | { |
2590 | argblock = push_block (GEN_INT (needed), 0, 0); | |
2591 | #ifdef ARGS_GROW_DOWNWARD | |
2592 | argblock = plus_constant (argblock, needed); | |
2593 | #endif | |
2594 | } | |
f73ad30e | 2595 | |
f8a097cd JH |
2596 | /* We only really need to call `copy_to_reg' in the case |
2597 | where push insns are going to be used to pass ARGBLOCK | |
2598 | to a function call in ARGS. In that case, the stack | |
2599 | pointer changes value from the allocation point to the | |
2600 | call point, and hence the value of | |
2601 | VIRTUAL_OUTGOING_ARGS_RTX changes as well. But might | |
2602 | as well always do it. */ | |
f73ad30e | 2603 | argblock = copy_to_reg (argblock); |
38afb23f OH |
2604 | } |
2605 | } | |
2606 | } | |
0a1c58a2 | 2607 | |
38afb23f OH |
2608 | if (ACCUMULATE_OUTGOING_ARGS) |
2609 | { | |
2610 | /* The save/restore code in store_one_arg handles all | |
2611 | cases except one: a constructor call (including a C | |
2612 | function returning a BLKmode struct) to initialize | |
2613 | an argument. */ | |
2614 | if (stack_arg_under_construction) | |
2615 | { | |
ac294f0b KT |
2616 | rtx push_size |
2617 | = GEN_INT (adjusted_args_size.constant | |
5d059ed9 | 2618 | + (OUTGOING_REG_PARM_STACK_SPACE ((!fndecl ? fntype |
81464b2c | 2619 | : TREE_TYPE (fndecl))) ? 0 |
ac294f0b | 2620 | : reg_parm_stack_space)); |
38afb23f OH |
2621 | if (old_stack_level == 0) |
2622 | { | |
2623 | emit_stack_save (SAVE_BLOCK, &old_stack_level, | |
2624 | NULL_RTX); | |
2625 | old_stack_pointer_delta = stack_pointer_delta; | |
2626 | old_pending_adj = pending_stack_adjust; | |
2627 | pending_stack_adjust = 0; | |
2628 | /* stack_arg_under_construction says whether a stack | |
2629 | arg is being constructed at the old stack level. | |
2630 | Pushing the stack gets a clean outgoing argument | |
2631 | block. */ | |
2632 | old_stack_arg_under_construction | |
2633 | = stack_arg_under_construction; | |
2634 | stack_arg_under_construction = 0; | |
2635 | /* Make a new map for the new argument list. */ | |
d9725c41 JJ |
2636 | if (stack_usage_map_buf) |
2637 | free (stack_usage_map_buf); | |
b9eae1a9 | 2638 | stack_usage_map_buf = XCNEWVEC (char, highest_outgoing_arg_in_use); |
d9725c41 | 2639 | stack_usage_map = stack_usage_map_buf; |
38afb23f | 2640 | highest_outgoing_arg_in_use = 0; |
f73ad30e | 2641 | } |
38afb23f OH |
2642 | allocate_dynamic_stack_space (push_size, NULL_RTX, |
2643 | BITS_PER_UNIT); | |
0a1c58a2 | 2644 | } |
bfbf933a | 2645 | |
38afb23f OH |
2646 | /* If argument evaluation might modify the stack pointer, |
2647 | copy the address of the argument list to a register. */ | |
2648 | for (i = 0; i < num_actuals; i++) | |
2649 | if (args[i].pass_on_stack) | |
2650 | { | |
2651 | argblock = copy_addr_to_reg (argblock); | |
2652 | break; | |
2653 | } | |
2654 | } | |
d329e058 | 2655 | |
0a1c58a2 | 2656 | compute_argument_addresses (args, argblock, num_actuals); |
bfbf933a | 2657 | |
0a1c58a2 JL |
2658 | /* If we push args individually in reverse order, perform stack alignment |
2659 | before the first push (the last arg). */ | |
f73ad30e | 2660 | if (PUSH_ARGS_REVERSED && argblock == 0 |
099e9712 | 2661 | && adjusted_args_size.constant != unadjusted_args_size) |
4e217aed | 2662 | { |
0a1c58a2 JL |
2663 | /* When the stack adjustment is pending, we get better code |
2664 | by combining the adjustments. */ | |
f725a3ec | 2665 | if (pending_stack_adjust |
0a1c58a2 | 2666 | && ! inhibit_defer_pop) |
ce48579b RH |
2667 | { |
2668 | pending_stack_adjust | |
f725a3ec | 2669 | = (combine_pending_stack_adjustment_and_call |
ce48579b | 2670 | (unadjusted_args_size, |
099e9712 | 2671 | &adjusted_args_size, |
ce48579b RH |
2672 | preferred_unit_stack_boundary)); |
2673 | do_pending_stack_adjust (); | |
2674 | } | |
0a1c58a2 | 2675 | else if (argblock == 0) |
099e9712 | 2676 | anti_adjust_stack (GEN_INT (adjusted_args_size.constant |
0a1c58a2 | 2677 | - unadjusted_args_size)); |
0a1c58a2 | 2678 | } |
ebcd0b57 JH |
2679 | /* Now that the stack is properly aligned, pops can't safely |
2680 | be deferred during the evaluation of the arguments. */ | |
2681 | NO_DEFER_POP; | |
51bbfa0c | 2682 | |
09e2bf48 | 2683 | funexp = rtx_for_function_call (fndecl, addr); |
51bbfa0c | 2684 | |
0a1c58a2 JL |
2685 | /* Figure out the register where the value, if any, will come back. */ |
2686 | valreg = 0; | |
28ed065e | 2687 | if (TYPE_MODE (rettype) != VOIDmode |
0a1c58a2 JL |
2688 | && ! structure_value_addr) |
2689 | { | |
2690 | if (pcc_struct_value) | |
28ed065e | 2691 | valreg = hard_function_value (build_pointer_type (rettype), |
1d636cc6 | 2692 | fndecl, NULL, (pass == 0)); |
0a1c58a2 | 2693 | else |
28ed065e | 2694 | valreg = hard_function_value (rettype, fndecl, fntype, |
1d636cc6 | 2695 | (pass == 0)); |
576c9028 KH |
2696 | |
2697 | /* If VALREG is a PARALLEL whose first member has a zero | |
2698 | offset, use that. This is for targets such as m68k that | |
2699 | return the same value in multiple places. */ | |
2700 | if (GET_CODE (valreg) == PARALLEL) | |
2701 | { | |
2702 | rtx elem = XVECEXP (valreg, 0, 0); | |
2703 | rtx where = XEXP (elem, 0); | |
2704 | rtx offset = XEXP (elem, 1); | |
2705 | if (offset == const0_rtx | |
2706 | && GET_MODE (where) == GET_MODE (valreg)) | |
2707 | valreg = where; | |
2708 | } | |
0a1c58a2 | 2709 | } |
51bbfa0c | 2710 | |
0a1c58a2 JL |
2711 | /* Precompute all register parameters. It isn't safe to compute anything |
2712 | once we have started filling any specific hard regs. */ | |
2713 | precompute_register_parameters (num_actuals, args, ®_parm_seen); | |
51bbfa0c | 2714 | |
5039610b SL |
2715 | if (CALL_EXPR_STATIC_CHAIN (exp)) |
2716 | static_chain_value = expand_normal (CALL_EXPR_STATIC_CHAIN (exp)); | |
6de9cd9a DN |
2717 | else |
2718 | static_chain_value = 0; | |
2719 | ||
f73ad30e | 2720 | #ifdef REG_PARM_STACK_SPACE |
0a1c58a2 JL |
2721 | /* Save the fixed argument area if it's part of the caller's frame and |
2722 | is clobbered by argument setup for this call. */ | |
f8a097cd | 2723 | if (ACCUMULATE_OUTGOING_ARGS && pass) |
f73ad30e JH |
2724 | save_area = save_fixed_argument_area (reg_parm_stack_space, argblock, |
2725 | &low_to_save, &high_to_save); | |
b94301c2 | 2726 | #endif |
51bbfa0c | 2727 | |
0a1c58a2 JL |
2728 | /* Now store (and compute if necessary) all non-register parms. |
2729 | These come before register parms, since they can require block-moves, | |
2730 | which could clobber the registers used for register parms. | |
2731 | Parms which have partial registers are not stored here, | |
2732 | but we do preallocate space here if they want that. */ | |
51bbfa0c | 2733 | |
0a1c58a2 | 2734 | for (i = 0; i < num_actuals; i++) |
0196c95e JJ |
2735 | { |
2736 | if (args[i].reg == 0 || args[i].pass_on_stack) | |
2737 | { | |
2738 | rtx before_arg = get_last_insn (); | |
2739 | ||
2740 | if (store_one_arg (&args[i], argblock, flags, | |
2741 | adjusted_args_size.var != 0, | |
2742 | reg_parm_stack_space) | |
2743 | || (pass == 0 | |
2744 | && check_sibcall_argument_overlap (before_arg, | |
2745 | &args[i], 1))) | |
2746 | sibcall_failure = 1; | |
2747 | } | |
2748 | ||
2749 | if (((flags & ECF_CONST) | |
2750 | || ((flags & ECF_PURE) && ACCUMULATE_OUTGOING_ARGS)) | |
2751 | && args[i].stack) | |
2752 | call_fusage = gen_rtx_EXPR_LIST (VOIDmode, | |
2753 | gen_rtx_USE (VOIDmode, | |
2754 | args[i].stack), | |
2755 | call_fusage); | |
2756 | } | |
0a1c58a2 JL |
2757 | |
2758 | /* If we have a parm that is passed in registers but not in memory | |
2759 | and whose alignment does not permit a direct copy into registers, | |
2760 | make a group of pseudos that correspond to each register that we | |
2761 | will later fill. */ | |
2762 | if (STRICT_ALIGNMENT) | |
2763 | store_unaligned_arguments_into_pseudos (args, num_actuals); | |
2764 | ||
2765 | /* Now store any partially-in-registers parm. | |
2766 | This is the last place a block-move can happen. */ | |
2767 | if (reg_parm_seen) | |
2768 | for (i = 0; i < num_actuals; i++) | |
2769 | if (args[i].partial != 0 && ! args[i].pass_on_stack) | |
c67846f2 JJ |
2770 | { |
2771 | rtx before_arg = get_last_insn (); | |
2772 | ||
4c6b3b2a JJ |
2773 | if (store_one_arg (&args[i], argblock, flags, |
2774 | adjusted_args_size.var != 0, | |
2775 | reg_parm_stack_space) | |
2776 | || (pass == 0 | |
2777 | && check_sibcall_argument_overlap (before_arg, | |
0cdca92b | 2778 | &args[i], 1))) |
c67846f2 JJ |
2779 | sibcall_failure = 1; |
2780 | } | |
51bbfa0c | 2781 | |
0a1c58a2 JL |
2782 | /* If we pushed args in forward order, perform stack alignment |
2783 | after pushing the last arg. */ | |
f73ad30e | 2784 | if (!PUSH_ARGS_REVERSED && argblock == 0) |
099e9712 | 2785 | anti_adjust_stack (GEN_INT (adjusted_args_size.constant |
0a1c58a2 | 2786 | - unadjusted_args_size)); |
51bbfa0c | 2787 | |
0a1c58a2 JL |
2788 | /* If register arguments require space on the stack and stack space |
2789 | was not preallocated, allocate stack space here for arguments | |
2790 | passed in registers. */ | |
5d059ed9 | 2791 | if (OUTGOING_REG_PARM_STACK_SPACE ((!fndecl ? fntype : TREE_TYPE (fndecl))) |
81464b2c | 2792 | && !ACCUMULATE_OUTGOING_ARGS |
f725a3ec | 2793 | && must_preallocate == 0 && reg_parm_stack_space > 0) |
0a1c58a2 | 2794 | anti_adjust_stack (GEN_INT (reg_parm_stack_space)); |
756e0e12 | 2795 | |
0a1c58a2 JL |
2796 | /* Pass the function the address in which to return a |
2797 | structure value. */ | |
2798 | if (pass != 0 && structure_value_addr && ! structure_value_addr_parm) | |
2799 | { | |
7ae4ad28 | 2800 | structure_value_addr |
5ae6cd0d | 2801 | = convert_memory_address (Pmode, structure_value_addr); |
61f71b34 | 2802 | emit_move_insn (struct_value, |
0a1c58a2 JL |
2803 | force_reg (Pmode, |
2804 | force_operand (structure_value_addr, | |
2805 | NULL_RTX))); | |
2806 | ||
f8cfc6aa | 2807 | if (REG_P (struct_value)) |
61f71b34 | 2808 | use_reg (&call_fusage, struct_value); |
0a1c58a2 | 2809 | } |
c2939b57 | 2810 | |
05e6ee93 | 2811 | after_args = get_last_insn (); |
6de9cd9a DN |
2812 | funexp = prepare_call_address (funexp, static_chain_value, |
2813 | &call_fusage, reg_parm_seen, pass == 0); | |
51bbfa0c | 2814 | |
0cdca92b DJ |
2815 | load_register_parameters (args, num_actuals, &call_fusage, flags, |
2816 | pass == 0, &sibcall_failure); | |
f725a3ec | 2817 | |
0a1c58a2 JL |
2818 | /* Save a pointer to the last insn before the call, so that we can |
2819 | later safely search backwards to find the CALL_INSN. */ | |
2820 | before_call = get_last_insn (); | |
51bbfa0c | 2821 | |
7d167afd JJ |
2822 | /* Set up next argument register. For sibling calls on machines |
2823 | with register windows this should be the incoming register. */ | |
2824 | #ifdef FUNCTION_INCOMING_ARG | |
2825 | if (pass == 0) | |
2826 | next_arg_reg = FUNCTION_INCOMING_ARG (args_so_far, VOIDmode, | |
2827 | void_type_node, 1); | |
2828 | else | |
2829 | #endif | |
2830 | next_arg_reg = FUNCTION_ARG (args_so_far, VOIDmode, | |
2831 | void_type_node, 1); | |
2832 | ||
0a1c58a2 JL |
2833 | /* All arguments and registers used for the call must be set up by |
2834 | now! */ | |
2835 | ||
ce48579b | 2836 | /* Stack must be properly aligned now. */ |
366de0ce NS |
2837 | gcc_assert (!pass |
2838 | || !(stack_pointer_delta % preferred_unit_stack_boundary)); | |
ebcd0b57 | 2839 | |
0a1c58a2 | 2840 | /* Generate the actual call instruction. */ |
6de9cd9a | 2841 | emit_call_1 (funexp, exp, fndecl, funtype, unadjusted_args_size, |
099e9712 | 2842 | adjusted_args_size.constant, struct_value_size, |
7d167afd | 2843 | next_arg_reg, valreg, old_inhibit_defer_pop, call_fusage, |
fa5322fa | 2844 | flags, & args_so_far); |
0a1c58a2 | 2845 | |
05e6ee93 MM |
2846 | /* If the call setup or the call itself overlaps with anything |
2847 | of the argument setup we probably clobbered our call address. | |
2848 | In that case we can't do sibcalls. */ | |
2849 | if (pass == 0 | |
2850 | && check_sibcall_argument_overlap (after_args, 0, 0)) | |
2851 | sibcall_failure = 1; | |
2852 | ||
bef5d8b6 RS |
2853 | /* If a non-BLKmode value is returned at the most significant end |
2854 | of a register, shift the register right by the appropriate amount | |
2855 | and update VALREG accordingly. BLKmode values are handled by the | |
2856 | group load/store machinery below. */ | |
2857 | if (!structure_value_addr | |
2858 | && !pcc_struct_value | |
28ed065e MM |
2859 | && TYPE_MODE (rettype) != BLKmode |
2860 | && targetm.calls.return_in_msb (rettype)) | |
bef5d8b6 | 2861 | { |
28ed065e | 2862 | if (shift_return_value (TYPE_MODE (rettype), false, valreg)) |
bef5d8b6 | 2863 | sibcall_failure = 1; |
28ed065e | 2864 | valreg = gen_rtx_REG (TYPE_MODE (rettype), REGNO (valreg)); |
bef5d8b6 RS |
2865 | } |
2866 | ||
84b8030f | 2867 | if (pass && (flags & ECF_MALLOC)) |
0a1c58a2 JL |
2868 | { |
2869 | rtx temp = gen_reg_rtx (GET_MODE (valreg)); | |
2870 | rtx last, insns; | |
2871 | ||
f725a3ec | 2872 | /* The return value from a malloc-like function is a pointer. */ |
28ed065e | 2873 | if (TREE_CODE (rettype) == POINTER_TYPE) |
bdb429a5 | 2874 | mark_reg_pointer (temp, BIGGEST_ALIGNMENT); |
0a1c58a2 JL |
2875 | |
2876 | emit_move_insn (temp, valreg); | |
2877 | ||
2878 | /* The return value from a malloc-like function can not alias | |
2879 | anything else. */ | |
2880 | last = get_last_insn (); | |
65c5f2a6 | 2881 | add_reg_note (last, REG_NOALIAS, temp); |
0a1c58a2 JL |
2882 | |
2883 | /* Write out the sequence. */ | |
2884 | insns = get_insns (); | |
2885 | end_sequence (); | |
2f937369 | 2886 | emit_insn (insns); |
0a1c58a2 JL |
2887 | valreg = temp; |
2888 | } | |
51bbfa0c | 2889 | |
6fb5fa3c DB |
2890 | /* For calls to `setjmp', etc., inform |
2891 | function.c:setjmp_warnings that it should complain if | |
2892 | nonvolatile values are live. For functions that cannot | |
2893 | return, inform flow that control does not fall through. */ | |
51bbfa0c | 2894 | |
6e14af16 | 2895 | if ((flags & ECF_NORETURN) || pass == 0) |
c2939b57 | 2896 | { |
570a98eb | 2897 | /* The barrier must be emitted |
0a1c58a2 JL |
2898 | immediately after the CALL_INSN. Some ports emit more |
2899 | than just a CALL_INSN above, so we must search for it here. */ | |
51bbfa0c | 2900 | |
0a1c58a2 | 2901 | rtx last = get_last_insn (); |
4b4bf941 | 2902 | while (!CALL_P (last)) |
0a1c58a2 JL |
2903 | { |
2904 | last = PREV_INSN (last); | |
2905 | /* There was no CALL_INSN? */ | |
366de0ce | 2906 | gcc_assert (last != before_call); |
0a1c58a2 | 2907 | } |
51bbfa0c | 2908 | |
570a98eb | 2909 | emit_barrier_after (last); |
8af61113 | 2910 | |
f451eeef JS |
2911 | /* Stack adjustments after a noreturn call are dead code. |
2912 | However when NO_DEFER_POP is in effect, we must preserve | |
2913 | stack_pointer_delta. */ | |
2914 | if (inhibit_defer_pop == 0) | |
2915 | { | |
2916 | stack_pointer_delta = old_stack_allocated; | |
2917 | pending_stack_adjust = 0; | |
2918 | } | |
0a1c58a2 | 2919 | } |
51bbfa0c | 2920 | |
0a1c58a2 | 2921 | /* If value type not void, return an rtx for the value. */ |
51bbfa0c | 2922 | |
28ed065e | 2923 | if (TYPE_MODE (rettype) == VOIDmode |
0a1c58a2 | 2924 | || ignore) |
b5cd4ed4 | 2925 | target = const0_rtx; |
0a1c58a2 JL |
2926 | else if (structure_value_addr) |
2927 | { | |
3c0cb5de | 2928 | if (target == 0 || !MEM_P (target)) |
0a1c58a2 | 2929 | { |
3bdf5ad1 | 2930 | target |
28ed065e MM |
2931 | = gen_rtx_MEM (TYPE_MODE (rettype), |
2932 | memory_address (TYPE_MODE (rettype), | |
3bdf5ad1 | 2933 | structure_value_addr)); |
28ed065e | 2934 | set_mem_attributes (target, rettype, 1); |
0a1c58a2 JL |
2935 | } |
2936 | } | |
2937 | else if (pcc_struct_value) | |
cacbd532 | 2938 | { |
0a1c58a2 JL |
2939 | /* This is the special C++ case where we need to |
2940 | know what the true target was. We take care to | |
2941 | never use this value more than once in one expression. */ | |
28ed065e | 2942 | target = gen_rtx_MEM (TYPE_MODE (rettype), |
0a1c58a2 | 2943 | copy_to_reg (valreg)); |
28ed065e | 2944 | set_mem_attributes (target, rettype, 1); |
cacbd532 | 2945 | } |
0a1c58a2 JL |
2946 | /* Handle calls that return values in multiple non-contiguous locations. |
2947 | The Irix 6 ABI has examples of this. */ | |
2948 | else if (GET_CODE (valreg) == PARALLEL) | |
2949 | { | |
6de9cd9a | 2950 | if (target == 0) |
0a1c58a2 | 2951 | { |
1da68f56 | 2952 | /* This will only be assigned once, so it can be readonly. */ |
28ed065e MM |
2953 | tree nt = build_qualified_type (rettype, |
2954 | (TYPE_QUALS (rettype) | |
1da68f56 RK |
2955 | | TYPE_QUAL_CONST)); |
2956 | ||
2957 | target = assign_temp (nt, 0, 1, 1); | |
0a1c58a2 JL |
2958 | } |
2959 | ||
2960 | if (! rtx_equal_p (target, valreg)) | |
28ed065e MM |
2961 | emit_group_store (target, valreg, rettype, |
2962 | int_size_in_bytes (rettype)); | |
19caa751 | 2963 | |
0a1c58a2 JL |
2964 | /* We can not support sibling calls for this case. */ |
2965 | sibcall_failure = 1; | |
2966 | } | |
2967 | else if (target | |
28ed065e | 2968 | && GET_MODE (target) == TYPE_MODE (rettype) |
0a1c58a2 JL |
2969 | && GET_MODE (target) == GET_MODE (valreg)) |
2970 | { | |
51caaefe EB |
2971 | bool may_overlap = false; |
2972 | ||
f2d18690 KK |
2973 | /* We have to copy a return value in a CLASS_LIKELY_SPILLED hard |
2974 | reg to a plain register. */ | |
3fb30019 RS |
2975 | if (!REG_P (target) || HARD_REGISTER_P (target)) |
2976 | valreg = avoid_likely_spilled_reg (valreg); | |
f2d18690 | 2977 | |
51caaefe EB |
2978 | /* If TARGET is a MEM in the argument area, and we have |
2979 | saved part of the argument area, then we can't store | |
2980 | directly into TARGET as it may get overwritten when we | |
2981 | restore the argument save area below. Don't work too | |
2982 | hard though and simply force TARGET to a register if it | |
2983 | is a MEM; the optimizer is quite likely to sort it out. */ | |
2984 | if (ACCUMULATE_OUTGOING_ARGS && pass && MEM_P (target)) | |
2985 | for (i = 0; i < num_actuals; i++) | |
2986 | if (args[i].save_area) | |
2987 | { | |
2988 | may_overlap = true; | |
2989 | break; | |
2990 | } | |
0219237c | 2991 | |
51caaefe EB |
2992 | if (may_overlap) |
2993 | target = copy_to_reg (valreg); | |
2994 | else | |
2995 | { | |
2996 | /* TARGET and VALREG cannot be equal at this point | |
2997 | because the latter would not have | |
2998 | REG_FUNCTION_VALUE_P true, while the former would if | |
2999 | it were referring to the same register. | |
3000 | ||
3001 | If they refer to the same register, this move will be | |
3002 | a no-op, except when function inlining is being | |
3003 | done. */ | |
3004 | emit_move_insn (target, valreg); | |
3005 | ||
3006 | /* If we are setting a MEM, this code must be executed. | |
3007 | Since it is emitted after the call insn, sibcall | |
3008 | optimization cannot be performed in that case. */ | |
3009 | if (MEM_P (target)) | |
3010 | sibcall_failure = 1; | |
3011 | } | |
0a1c58a2 | 3012 | } |
28ed065e | 3013 | else if (TYPE_MODE (rettype) == BLKmode) |
8eb99146 | 3014 | { |
28ed065e | 3015 | target = copy_blkmode_from_reg (target, valreg, rettype); |
8eb99146 RH |
3016 | |
3017 | /* We can not support sibling calls for this case. */ | |
3018 | sibcall_failure = 1; | |
3019 | } | |
0a1c58a2 | 3020 | else |
3fb30019 | 3021 | target = copy_to_reg (avoid_likely_spilled_reg (valreg)); |
51bbfa0c | 3022 | |
cde0f3fd PB |
3023 | /* If we promoted this return value, make the proper SUBREG. |
3024 | TARGET might be const0_rtx here, so be careful. */ | |
3025 | if (REG_P (target) | |
28ed065e MM |
3026 | && TYPE_MODE (rettype) != BLKmode |
3027 | && GET_MODE (target) != TYPE_MODE (rettype)) | |
61f71b34 | 3028 | { |
28ed065e | 3029 | tree type = rettype; |
cde0f3fd PB |
3030 | int unsignedp = TYPE_UNSIGNED (type); |
3031 | int offset = 0; | |
3032 | enum machine_mode pmode; | |
3033 | ||
3034 | /* Ensure we promote as expected, and get the new unsignedness. */ | |
3035 | pmode = promote_function_mode (type, TYPE_MODE (type), &unsignedp, | |
3036 | funtype, 1); | |
3037 | gcc_assert (GET_MODE (target) == pmode); | |
3038 | ||
3039 | if ((WORDS_BIG_ENDIAN || BYTES_BIG_ENDIAN) | |
3040 | && (GET_MODE_SIZE (GET_MODE (target)) | |
3041 | > GET_MODE_SIZE (TYPE_MODE (type)))) | |
366de0ce | 3042 | { |
cde0f3fd PB |
3043 | offset = GET_MODE_SIZE (GET_MODE (target)) |
3044 | - GET_MODE_SIZE (TYPE_MODE (type)); | |
3045 | if (! BYTES_BIG_ENDIAN) | |
3046 | offset = (offset / UNITS_PER_WORD) * UNITS_PER_WORD; | |
3047 | else if (! WORDS_BIG_ENDIAN) | |
3048 | offset %= UNITS_PER_WORD; | |
366de0ce | 3049 | } |
cde0f3fd PB |
3050 | |
3051 | target = gen_rtx_SUBREG (TYPE_MODE (type), target, offset); | |
3052 | SUBREG_PROMOTED_VAR_P (target) = 1; | |
3053 | SUBREG_PROMOTED_UNSIGNED_SET (target, unsignedp); | |
61f71b34 | 3054 | } |
84b55618 | 3055 | |
0a1c58a2 JL |
3056 | /* If size of args is variable or this was a constructor call for a stack |
3057 | argument, restore saved stack-pointer value. */ | |
51bbfa0c | 3058 | |
9dd9bf80 | 3059 | if (old_stack_level) |
0a1c58a2 JL |
3060 | { |
3061 | emit_stack_restore (SAVE_BLOCK, old_stack_level, NULL_RTX); | |
38afb23f | 3062 | stack_pointer_delta = old_stack_pointer_delta; |
0a1c58a2 | 3063 | pending_stack_adjust = old_pending_adj; |
d25cee4d | 3064 | old_stack_allocated = stack_pointer_delta - pending_stack_adjust; |
0a1c58a2 JL |
3065 | stack_arg_under_construction = old_stack_arg_under_construction; |
3066 | highest_outgoing_arg_in_use = initial_highest_arg_in_use; | |
3067 | stack_usage_map = initial_stack_usage_map; | |
0a1c58a2 JL |
3068 | sibcall_failure = 1; |
3069 | } | |
f8a097cd | 3070 | else if (ACCUMULATE_OUTGOING_ARGS && pass) |
0a1c58a2 | 3071 | { |
51bbfa0c | 3072 | #ifdef REG_PARM_STACK_SPACE |
0a1c58a2 | 3073 | if (save_area) |
b820d2b8 AM |
3074 | restore_fixed_argument_area (save_area, argblock, |
3075 | high_to_save, low_to_save); | |
b94301c2 | 3076 | #endif |
51bbfa0c | 3077 | |
0a1c58a2 JL |
3078 | /* If we saved any argument areas, restore them. */ |
3079 | for (i = 0; i < num_actuals; i++) | |
3080 | if (args[i].save_area) | |
3081 | { | |
3082 | enum machine_mode save_mode = GET_MODE (args[i].save_area); | |
3083 | rtx stack_area | |
3084 | = gen_rtx_MEM (save_mode, | |
3085 | memory_address (save_mode, | |
3086 | XEXP (args[i].stack_slot, 0))); | |
3087 | ||
3088 | if (save_mode != BLKmode) | |
3089 | emit_move_insn (stack_area, args[i].save_area); | |
3090 | else | |
44bb111a | 3091 | emit_block_move (stack_area, args[i].save_area, |
e7949876 | 3092 | GEN_INT (args[i].locate.size.constant), |
44bb111a | 3093 | BLOCK_OP_CALL_PARM); |
0a1c58a2 | 3094 | } |
51bbfa0c | 3095 | |
0a1c58a2 JL |
3096 | highest_outgoing_arg_in_use = initial_highest_arg_in_use; |
3097 | stack_usage_map = initial_stack_usage_map; | |
3098 | } | |
51bbfa0c | 3099 | |
f725a3ec | 3100 | /* If this was alloca, record the new stack level for nonlocal gotos. |
0a1c58a2 JL |
3101 | Check for the handler slots since we might not have a save area |
3102 | for non-local gotos. */ | |
59257ff7 | 3103 | |
6de9cd9a DN |
3104 | if ((flags & ECF_MAY_BE_ALLOCA) && cfun->nonlocal_goto_save_area != 0) |
3105 | update_nonlocal_goto_save_area (); | |
51bbfa0c | 3106 | |
0a1c58a2 JL |
3107 | /* Free up storage we no longer need. */ |
3108 | for (i = 0; i < num_actuals; ++i) | |
3109 | if (args[i].aligned_regs) | |
3110 | free (args[i].aligned_regs); | |
3111 | ||
3112 | insns = get_insns (); | |
3113 | end_sequence (); | |
3114 | ||
3115 | if (pass == 0) | |
3116 | { | |
3117 | tail_call_insns = insns; | |
3118 | ||
0a1c58a2 JL |
3119 | /* Restore the pending stack adjustment now that we have |
3120 | finished generating the sibling call sequence. */ | |
1503a7ec | 3121 | |
0a1c58a2 | 3122 | pending_stack_adjust = save_pending_stack_adjust; |
1503a7ec | 3123 | stack_pointer_delta = save_stack_pointer_delta; |
099e9712 JH |
3124 | |
3125 | /* Prepare arg structure for next iteration. */ | |
f725a3ec | 3126 | for (i = 0; i < num_actuals; i++) |
099e9712 JH |
3127 | { |
3128 | args[i].value = 0; | |
3129 | args[i].aligned_regs = 0; | |
3130 | args[i].stack = 0; | |
3131 | } | |
c67846f2 JJ |
3132 | |
3133 | sbitmap_free (stored_args_map); | |
0a1c58a2 JL |
3134 | } |
3135 | else | |
38afb23f OH |
3136 | { |
3137 | normal_call_insns = insns; | |
3138 | ||
3139 | /* Verify that we've deallocated all the stack we used. */ | |
6e14af16 | 3140 | gcc_assert ((flags & ECF_NORETURN) |
366de0ce NS |
3141 | || (old_stack_allocated |
3142 | == stack_pointer_delta - pending_stack_adjust)); | |
38afb23f | 3143 | } |
fadb729c JJ |
3144 | |
3145 | /* If something prevents making this a sibling call, | |
3146 | zero out the sequence. */ | |
3147 | if (sibcall_failure) | |
3148 | tail_call_insns = NULL_RTX; | |
6de9cd9a DN |
3149 | else |
3150 | break; | |
0a1c58a2 JL |
3151 | } |
3152 | ||
1ea7e6ad | 3153 | /* If tail call production succeeded, we need to remove REG_EQUIV notes on |
6de9cd9a DN |
3154 | arguments too, as argument area is now clobbered by the call. */ |
3155 | if (tail_call_insns) | |
0a1c58a2 | 3156 | { |
6de9cd9a | 3157 | emit_insn (tail_call_insns); |
e3b5732b | 3158 | crtl->tail_call_emit = true; |
0a1c58a2 JL |
3159 | } |
3160 | else | |
2f937369 | 3161 | emit_insn (normal_call_insns); |
51bbfa0c | 3162 | |
0a1c58a2 | 3163 | currently_expanding_call--; |
8e6a59fe | 3164 | |
d9725c41 JJ |
3165 | if (stack_usage_map_buf) |
3166 | free (stack_usage_map_buf); | |
3167 | ||
51bbfa0c RS |
3168 | return target; |
3169 | } | |
ded9bf77 | 3170 | |
6de9cd9a DN |
3171 | /* A sibling call sequence invalidates any REG_EQUIV notes made for |
3172 | this function's incoming arguments. | |
3173 | ||
3174 | At the start of RTL generation we know the only REG_EQUIV notes | |
29d51cdb SB |
3175 | in the rtl chain are those for incoming arguments, so we can look |
3176 | for REG_EQUIV notes between the start of the function and the | |
3177 | NOTE_INSN_FUNCTION_BEG. | |
6de9cd9a DN |
3178 | |
3179 | This is (slight) overkill. We could keep track of the highest | |
3180 | argument we clobber and be more selective in removing notes, but it | |
3181 | does not seem to be worth the effort. */ | |
29d51cdb | 3182 | |
6de9cd9a DN |
3183 | void |
3184 | fixup_tail_calls (void) | |
3185 | { | |
29d51cdb SB |
3186 | rtx insn; |
3187 | ||
3188 | for (insn = get_insns (); insn; insn = NEXT_INSN (insn)) | |
3189 | { | |
a31830a7 SB |
3190 | rtx note; |
3191 | ||
29d51cdb SB |
3192 | /* There are never REG_EQUIV notes for the incoming arguments |
3193 | after the NOTE_INSN_FUNCTION_BEG note, so stop if we see it. */ | |
3194 | if (NOTE_P (insn) | |
a38e7aa5 | 3195 | && NOTE_KIND (insn) == NOTE_INSN_FUNCTION_BEG) |
29d51cdb SB |
3196 | break; |
3197 | ||
a31830a7 SB |
3198 | note = find_reg_note (insn, REG_EQUIV, 0); |
3199 | if (note) | |
3200 | remove_note (insn, note); | |
3201 | note = find_reg_note (insn, REG_EQUIV, 0); | |
3202 | gcc_assert (!note); | |
29d51cdb | 3203 | } |
6de9cd9a DN |
3204 | } |
3205 | ||
ded9bf77 AH |
3206 | /* Traverse a list of TYPES and expand all complex types into their |
3207 | components. */ | |
2f2b4a02 | 3208 | static tree |
ded9bf77 AH |
3209 | split_complex_types (tree types) |
3210 | { | |
3211 | tree p; | |
3212 | ||
42ba5130 RH |
3213 | /* Before allocating memory, check for the common case of no complex. */ |
3214 | for (p = types; p; p = TREE_CHAIN (p)) | |
3215 | { | |
3216 | tree type = TREE_VALUE (p); | |
3217 | if (TREE_CODE (type) == COMPLEX_TYPE | |
3218 | && targetm.calls.split_complex_arg (type)) | |
c22cacf3 | 3219 | goto found; |
42ba5130 RH |
3220 | } |
3221 | return types; | |
3222 | ||
3223 | found: | |
ded9bf77 AH |
3224 | types = copy_list (types); |
3225 | ||
3226 | for (p = types; p; p = TREE_CHAIN (p)) | |
3227 | { | |
3228 | tree complex_type = TREE_VALUE (p); | |
3229 | ||
42ba5130 RH |
3230 | if (TREE_CODE (complex_type) == COMPLEX_TYPE |
3231 | && targetm.calls.split_complex_arg (complex_type)) | |
ded9bf77 AH |
3232 | { |
3233 | tree next, imag; | |
3234 | ||
3235 | /* Rewrite complex type with component type. */ | |
3236 | TREE_VALUE (p) = TREE_TYPE (complex_type); | |
3237 | next = TREE_CHAIN (p); | |
3238 | ||
3239 | /* Add another component type for the imaginary part. */ | |
3240 | imag = build_tree_list (NULL_TREE, TREE_VALUE (p)); | |
3241 | TREE_CHAIN (p) = imag; | |
3242 | TREE_CHAIN (imag) = next; | |
3243 | ||
3244 | /* Skip the newly created node. */ | |
3245 | p = TREE_CHAIN (p); | |
3246 | } | |
3247 | } | |
3248 | ||
3249 | return types; | |
3250 | } | |
51bbfa0c | 3251 | \f |
de76b467 | 3252 | /* Output a library call to function FUN (a SYMBOL_REF rtx). |
f725a3ec | 3253 | The RETVAL parameter specifies whether return value needs to be saved, other |
0407c02b | 3254 | parameters are documented in the emit_library_call function below. */ |
8ac61af7 | 3255 | |
de76b467 | 3256 | static rtx |
d329e058 AJ |
3257 | emit_library_call_value_1 (int retval, rtx orgfun, rtx value, |
3258 | enum libcall_type fn_type, | |
3259 | enum machine_mode outmode, int nargs, va_list p) | |
43bc5f13 | 3260 | { |
3c0fca12 RH |
3261 | /* Total size in bytes of all the stack-parms scanned so far. */ |
3262 | struct args_size args_size; | |
3263 | /* Size of arguments before any adjustments (such as rounding). */ | |
3264 | struct args_size original_args_size; | |
b3694847 | 3265 | int argnum; |
3c0fca12 | 3266 | rtx fun; |
81464b2c KT |
3267 | /* Todo, choose the correct decl type of orgfun. Sadly this information |
3268 | isn't present here, so we default to native calling abi here. */ | |
033df0b9 | 3269 | tree fndecl ATTRIBUTE_UNUSED = NULL_TREE; /* library calls default to host calling abi ? */ |
5d059ed9 | 3270 | tree fntype ATTRIBUTE_UNUSED = NULL_TREE; /* library calls default to host calling abi ? */ |
3c0fca12 RH |
3271 | int inc; |
3272 | int count; | |
3c0fca12 RH |
3273 | rtx argblock = 0; |
3274 | CUMULATIVE_ARGS args_so_far; | |
f725a3ec KH |
3275 | struct arg |
3276 | { | |
3277 | rtx value; | |
3278 | enum machine_mode mode; | |
3279 | rtx reg; | |
3280 | int partial; | |
e7949876 | 3281 | struct locate_and_pad_arg_data locate; |
f725a3ec KH |
3282 | rtx save_area; |
3283 | }; | |
3c0fca12 RH |
3284 | struct arg *argvec; |
3285 | int old_inhibit_defer_pop = inhibit_defer_pop; | |
3286 | rtx call_fusage = 0; | |
3287 | rtx mem_value = 0; | |
5591ee6f | 3288 | rtx valreg; |
3c0fca12 RH |
3289 | int pcc_struct_value = 0; |
3290 | int struct_value_size = 0; | |
52a11cbf | 3291 | int flags; |
3c0fca12 | 3292 | int reg_parm_stack_space = 0; |
3c0fca12 | 3293 | int needed; |
695ee791 | 3294 | rtx before_call; |
b0c48229 | 3295 | tree tfom; /* type_for_mode (outmode, 0) */ |
3c0fca12 | 3296 | |
f73ad30e | 3297 | #ifdef REG_PARM_STACK_SPACE |
3c0fca12 RH |
3298 | /* Define the boundary of the register parm stack space that needs to be |
3299 | save, if any. */ | |
726a989a | 3300 | int low_to_save = 0, high_to_save = 0; |
f725a3ec | 3301 | rtx save_area = 0; /* Place that it is saved. */ |
3c0fca12 RH |
3302 | #endif |
3303 | ||
3c0fca12 RH |
3304 | /* Size of the stack reserved for parameter registers. */ |
3305 | int initial_highest_arg_in_use = highest_outgoing_arg_in_use; | |
3306 | char *initial_stack_usage_map = stack_usage_map; | |
d9725c41 | 3307 | char *stack_usage_map_buf = NULL; |
3c0fca12 | 3308 | |
61f71b34 DD |
3309 | rtx struct_value = targetm.calls.struct_value_rtx (0, 0); |
3310 | ||
3c0fca12 | 3311 | #ifdef REG_PARM_STACK_SPACE |
3c0fca12 | 3312 | reg_parm_stack_space = REG_PARM_STACK_SPACE ((tree) 0); |
3c0fca12 RH |
3313 | #endif |
3314 | ||
9555a122 | 3315 | /* By default, library functions can not throw. */ |
52a11cbf RH |
3316 | flags = ECF_NOTHROW; |
3317 | ||
9555a122 RH |
3318 | switch (fn_type) |
3319 | { | |
3320 | case LCT_NORMAL: | |
53d4257f | 3321 | break; |
9555a122 | 3322 | case LCT_CONST: |
53d4257f JH |
3323 | flags |= ECF_CONST; |
3324 | break; | |
9555a122 | 3325 | case LCT_PURE: |
53d4257f | 3326 | flags |= ECF_PURE; |
9555a122 | 3327 | break; |
9555a122 RH |
3328 | case LCT_NORETURN: |
3329 | flags |= ECF_NORETURN; | |
3330 | break; | |
3331 | case LCT_THROW: | |
3332 | flags = ECF_NORETURN; | |
3333 | break; | |
9defc9b7 RH |
3334 | case LCT_RETURNS_TWICE: |
3335 | flags = ECF_RETURNS_TWICE; | |
3336 | break; | |
9555a122 | 3337 | } |
3c0fca12 RH |
3338 | fun = orgfun; |
3339 | ||
3c0fca12 RH |
3340 | /* Ensure current function's preferred stack boundary is at least |
3341 | what we need. */ | |
cb91fab0 JH |
3342 | if (crtl->preferred_stack_boundary < PREFERRED_STACK_BOUNDARY) |
3343 | crtl->preferred_stack_boundary = PREFERRED_STACK_BOUNDARY; | |
3c0fca12 RH |
3344 | |
3345 | /* If this kind of value comes back in memory, | |
3346 | decide where in memory it should come back. */ | |
b0c48229 | 3347 | if (outmode != VOIDmode) |
3c0fca12 | 3348 | { |
ae2bcd98 | 3349 | tfom = lang_hooks.types.type_for_mode (outmode, 0); |
61f71b34 | 3350 | if (aggregate_value_p (tfom, 0)) |
b0c48229 | 3351 | { |
3c0fca12 | 3352 | #ifdef PCC_STATIC_STRUCT_RETURN |
b0c48229 | 3353 | rtx pointer_reg |
1d636cc6 | 3354 | = hard_function_value (build_pointer_type (tfom), 0, 0, 0); |
b0c48229 NB |
3355 | mem_value = gen_rtx_MEM (outmode, pointer_reg); |
3356 | pcc_struct_value = 1; | |
3357 | if (value == 0) | |
3358 | value = gen_reg_rtx (outmode); | |
3c0fca12 | 3359 | #else /* not PCC_STATIC_STRUCT_RETURN */ |
b0c48229 | 3360 | struct_value_size = GET_MODE_SIZE (outmode); |
3c0cb5de | 3361 | if (value != 0 && MEM_P (value)) |
b0c48229 NB |
3362 | mem_value = value; |
3363 | else | |
3364 | mem_value = assign_temp (tfom, 0, 1, 1); | |
3c0fca12 | 3365 | #endif |
b0c48229 | 3366 | /* This call returns a big structure. */ |
84b8030f | 3367 | flags &= ~(ECF_CONST | ECF_PURE | ECF_LOOPING_CONST_OR_PURE); |
b0c48229 | 3368 | } |
3c0fca12 | 3369 | } |
b0c48229 NB |
3370 | else |
3371 | tfom = void_type_node; | |
3c0fca12 RH |
3372 | |
3373 | /* ??? Unfinished: must pass the memory address as an argument. */ | |
3374 | ||
3375 | /* Copy all the libcall-arguments out of the varargs data | |
3376 | and into a vector ARGVEC. | |
3377 | ||
3378 | Compute how to pass each argument. We only support a very small subset | |
3379 | of the full argument passing conventions to limit complexity here since | |
3380 | library functions shouldn't have many args. */ | |
3381 | ||
f883e0a7 | 3382 | argvec = XALLOCAVEC (struct arg, nargs + 1); |
703ad42b | 3383 | memset (argvec, 0, (nargs + 1) * sizeof (struct arg)); |
3c0fca12 | 3384 | |
97fc4caf AO |
3385 | #ifdef INIT_CUMULATIVE_LIBCALL_ARGS |
3386 | INIT_CUMULATIVE_LIBCALL_ARGS (args_so_far, outmode, fun); | |
3387 | #else | |
0f6937fe | 3388 | INIT_CUMULATIVE_ARGS (args_so_far, NULL_TREE, fun, 0, nargs); |
97fc4caf | 3389 | #endif |
3c0fca12 RH |
3390 | |
3391 | args_size.constant = 0; | |
3392 | args_size.var = 0; | |
3393 | ||
3394 | count = 0; | |
3395 | ||
3396 | push_temp_slots (); | |
3397 | ||
3398 | /* If there's a structure value address to be passed, | |
3399 | either pass it in the special place, or pass it as an extra argument. */ | |
61f71b34 | 3400 | if (mem_value && struct_value == 0 && ! pcc_struct_value) |
3c0fca12 RH |
3401 | { |
3402 | rtx addr = XEXP (mem_value, 0); | |
c22cacf3 | 3403 | |
3c0fca12 RH |
3404 | nargs++; |
3405 | ||
ee88d9aa MK |
3406 | /* Make sure it is a reasonable operand for a move or push insn. */ |
3407 | if (!REG_P (addr) && !MEM_P (addr) | |
3408 | && ! (CONSTANT_P (addr) && LEGITIMATE_CONSTANT_P (addr))) | |
3409 | addr = force_operand (addr, NULL_RTX); | |
3410 | ||
3c0fca12 RH |
3411 | argvec[count].value = addr; |
3412 | argvec[count].mode = Pmode; | |
3413 | argvec[count].partial = 0; | |
3414 | ||
3415 | argvec[count].reg = FUNCTION_ARG (args_so_far, Pmode, NULL_TREE, 1); | |
78a52f11 RH |
3416 | gcc_assert (targetm.calls.arg_partial_bytes (&args_so_far, Pmode, |
3417 | NULL_TREE, 1) == 0); | |
3c0fca12 RH |
3418 | |
3419 | locate_and_pad_parm (Pmode, NULL_TREE, | |
a4d5044f | 3420 | #ifdef STACK_PARMS_IN_REG_PARM_AREA |
c22cacf3 | 3421 | 1, |
a4d5044f CM |
3422 | #else |
3423 | argvec[count].reg != 0, | |
3424 | #endif | |
e7949876 | 3425 | 0, NULL_TREE, &args_size, &argvec[count].locate); |
3c0fca12 | 3426 | |
3c0fca12 RH |
3427 | if (argvec[count].reg == 0 || argvec[count].partial != 0 |
3428 | || reg_parm_stack_space > 0) | |
e7949876 | 3429 | args_size.constant += argvec[count].locate.size.constant; |
3c0fca12 RH |
3430 | |
3431 | FUNCTION_ARG_ADVANCE (args_so_far, Pmode, (tree) 0, 1); | |
3432 | ||
3433 | count++; | |
3434 | } | |
3435 | ||
3436 | for (; count < nargs; count++) | |
3437 | { | |
3438 | rtx val = va_arg (p, rtx); | |
72b5577d | 3439 | enum machine_mode mode = (enum machine_mode) va_arg (p, int); |
3c0fca12 RH |
3440 | |
3441 | /* We cannot convert the arg value to the mode the library wants here; | |
3442 | must do it earlier where we know the signedness of the arg. */ | |
366de0ce NS |
3443 | gcc_assert (mode != BLKmode |
3444 | && (GET_MODE (val) == mode || GET_MODE (val) == VOIDmode)); | |
3c0fca12 | 3445 | |
ee88d9aa MK |
3446 | /* Make sure it is a reasonable operand for a move or push insn. */ |
3447 | if (!REG_P (val) && !MEM_P (val) | |
3448 | && ! (CONSTANT_P (val) && LEGITIMATE_CONSTANT_P (val))) | |
3449 | val = force_operand (val, NULL_RTX); | |
3450 | ||
0976078c | 3451 | if (pass_by_reference (&args_so_far, mode, NULL_TREE, 1)) |
3c0fca12 | 3452 | { |
f474c6f8 | 3453 | rtx slot; |
6cdd5672 RH |
3454 | int must_copy |
3455 | = !reference_callee_copied (&args_so_far, mode, NULL_TREE, 1); | |
f474c6f8 | 3456 | |
becfd6e5 KZ |
3457 | /* If this was a CONST function, it is now PURE since it now |
3458 | reads memory. */ | |
99a32567 DM |
3459 | if (flags & ECF_CONST) |
3460 | { | |
3461 | flags &= ~ECF_CONST; | |
3462 | flags |= ECF_PURE; | |
3463 | } | |
3464 | ||
e0c68ce9 | 3465 | if (MEM_P (val) && !must_copy) |
f474c6f8 | 3466 | slot = val; |
9969aaf6 | 3467 | else |
f474c6f8 | 3468 | { |
ae2bcd98 | 3469 | slot = assign_temp (lang_hooks.types.type_for_mode (mode, 0), |
b0c48229 | 3470 | 0, 1, 1); |
f474c6f8 AO |
3471 | emit_move_insn (slot, val); |
3472 | } | |
1da68f56 | 3473 | |
6b5273c3 AO |
3474 | call_fusage = gen_rtx_EXPR_LIST (VOIDmode, |
3475 | gen_rtx_USE (VOIDmode, slot), | |
3476 | call_fusage); | |
f474c6f8 AO |
3477 | if (must_copy) |
3478 | call_fusage = gen_rtx_EXPR_LIST (VOIDmode, | |
3479 | gen_rtx_CLOBBER (VOIDmode, | |
3480 | slot), | |
3481 | call_fusage); | |
3482 | ||
3c0fca12 | 3483 | mode = Pmode; |
f474c6f8 | 3484 | val = force_operand (XEXP (slot, 0), NULL_RTX); |
3c0fca12 | 3485 | } |
3c0fca12 RH |
3486 | |
3487 | argvec[count].value = val; | |
3488 | argvec[count].mode = mode; | |
3489 | ||
3490 | argvec[count].reg = FUNCTION_ARG (args_so_far, mode, NULL_TREE, 1); | |
3491 | ||
3c0fca12 | 3492 | argvec[count].partial |
78a52f11 | 3493 | = targetm.calls.arg_partial_bytes (&args_so_far, mode, NULL_TREE, 1); |
3c0fca12 RH |
3494 | |
3495 | locate_and_pad_parm (mode, NULL_TREE, | |
a4d5044f | 3496 | #ifdef STACK_PARMS_IN_REG_PARM_AREA |
f725a3ec | 3497 | 1, |
a4d5044f CM |
3498 | #else |
3499 | argvec[count].reg != 0, | |
3500 | #endif | |
e7949876 AM |
3501 | argvec[count].partial, |
3502 | NULL_TREE, &args_size, &argvec[count].locate); | |
3c0fca12 | 3503 | |
366de0ce | 3504 | gcc_assert (!argvec[count].locate.size.var); |
3c0fca12 | 3505 | |
3c0fca12 RH |
3506 | if (argvec[count].reg == 0 || argvec[count].partial != 0 |
3507 | || reg_parm_stack_space > 0) | |
e7949876 | 3508 | args_size.constant += argvec[count].locate.size.constant; |
3c0fca12 RH |
3509 | |
3510 | FUNCTION_ARG_ADVANCE (args_so_far, mode, (tree) 0, 1); | |
3511 | } | |
3c0fca12 | 3512 | |
3c0fca12 RH |
3513 | /* If this machine requires an external definition for library |
3514 | functions, write one out. */ | |
3515 | assemble_external_libcall (fun); | |
3516 | ||
3517 | original_args_size = args_size; | |
1503a7ec JH |
3518 | args_size.constant = (((args_size.constant |
3519 | + stack_pointer_delta | |
3520 | + STACK_BYTES - 1) | |
3521 | / STACK_BYTES | |
3522 | * STACK_BYTES) | |
3523 | - stack_pointer_delta); | |
3c0fca12 RH |
3524 | |
3525 | args_size.constant = MAX (args_size.constant, | |
3526 | reg_parm_stack_space); | |
3527 | ||
5d059ed9 | 3528 | if (! OUTGOING_REG_PARM_STACK_SPACE ((!fndecl ? fntype : TREE_TYPE (fndecl)))) |
ac294f0b | 3529 | args_size.constant -= reg_parm_stack_space; |
3c0fca12 | 3530 | |
38173d38 JH |
3531 | if (args_size.constant > crtl->outgoing_args_size) |
3532 | crtl->outgoing_args_size = args_size.constant; | |
3c0fca12 | 3533 | |
f73ad30e JH |
3534 | if (ACCUMULATE_OUTGOING_ARGS) |
3535 | { | |
3536 | /* Since the stack pointer will never be pushed, it is possible for | |
3537 | the evaluation of a parm to clobber something we have already | |
3538 | written to the stack. Since most function calls on RISC machines | |
3539 | do not use the stack, this is uncommon, but must work correctly. | |
3c0fca12 | 3540 | |
f73ad30e JH |
3541 | Therefore, we save any area of the stack that was already written |
3542 | and that we are using. Here we set up to do this by making a new | |
3543 | stack usage map from the old one. | |
3c0fca12 | 3544 | |
f73ad30e JH |
3545 | Another approach might be to try to reorder the argument |
3546 | evaluations to avoid this conflicting stack usage. */ | |
3c0fca12 | 3547 | |
f73ad30e | 3548 | needed = args_size.constant; |
3c0fca12 | 3549 | |
f73ad30e JH |
3550 | /* Since we will be writing into the entire argument area, the |
3551 | map must be allocated for its entire size, not just the part that | |
3552 | is the responsibility of the caller. */ | |
5d059ed9 | 3553 | if (! OUTGOING_REG_PARM_STACK_SPACE ((!fndecl ? fntype : TREE_TYPE (fndecl)))) |
ac294f0b | 3554 | needed += reg_parm_stack_space; |
3c0fca12 RH |
3555 | |
3556 | #ifdef ARGS_GROW_DOWNWARD | |
f73ad30e JH |
3557 | highest_outgoing_arg_in_use = MAX (initial_highest_arg_in_use, |
3558 | needed + 1); | |
3c0fca12 | 3559 | #else |
f73ad30e JH |
3560 | highest_outgoing_arg_in_use = MAX (initial_highest_arg_in_use, |
3561 | needed); | |
3c0fca12 | 3562 | #endif |
5ed6ace5 | 3563 | stack_usage_map_buf = XNEWVEC (char, highest_outgoing_arg_in_use); |
d9725c41 | 3564 | stack_usage_map = stack_usage_map_buf; |
3c0fca12 | 3565 | |
f73ad30e | 3566 | if (initial_highest_arg_in_use) |
2e09e75a JM |
3567 | memcpy (stack_usage_map, initial_stack_usage_map, |
3568 | initial_highest_arg_in_use); | |
3c0fca12 | 3569 | |
f73ad30e | 3570 | if (initial_highest_arg_in_use != highest_outgoing_arg_in_use) |
961192e1 | 3571 | memset (&stack_usage_map[initial_highest_arg_in_use], 0, |
f73ad30e JH |
3572 | highest_outgoing_arg_in_use - initial_highest_arg_in_use); |
3573 | needed = 0; | |
3c0fca12 | 3574 | |
c39ada04 | 3575 | /* We must be careful to use virtual regs before they're instantiated, |
c22cacf3 | 3576 | and real regs afterwards. Loop optimization, for example, can create |
c39ada04 DD |
3577 | new libcalls after we've instantiated the virtual regs, and if we |
3578 | use virtuals anyway, they won't match the rtl patterns. */ | |
3c0fca12 | 3579 | |
c39ada04 DD |
3580 | if (virtuals_instantiated) |
3581 | argblock = plus_constant (stack_pointer_rtx, STACK_POINTER_OFFSET); | |
3582 | else | |
3583 | argblock = virtual_outgoing_args_rtx; | |
f73ad30e JH |
3584 | } |
3585 | else | |
3586 | { | |
3587 | if (!PUSH_ARGS) | |
3588 | argblock = push_block (GEN_INT (args_size.constant), 0, 0); | |
3589 | } | |
3c0fca12 | 3590 | |
3c0fca12 RH |
3591 | /* If we push args individually in reverse order, perform stack alignment |
3592 | before the first push (the last arg). */ | |
f73ad30e | 3593 | if (argblock == 0 && PUSH_ARGS_REVERSED) |
3c0fca12 RH |
3594 | anti_adjust_stack (GEN_INT (args_size.constant |
3595 | - original_args_size.constant)); | |
3c0fca12 | 3596 | |
f73ad30e JH |
3597 | if (PUSH_ARGS_REVERSED) |
3598 | { | |
3599 | inc = -1; | |
3600 | argnum = nargs - 1; | |
3601 | } | |
3602 | else | |
3603 | { | |
3604 | inc = 1; | |
3605 | argnum = 0; | |
3606 | } | |
3c0fca12 | 3607 | |
f73ad30e JH |
3608 | #ifdef REG_PARM_STACK_SPACE |
3609 | if (ACCUMULATE_OUTGOING_ARGS) | |
3610 | { | |
3611 | /* The argument list is the property of the called routine and it | |
3612 | may clobber it. If the fixed area has been used for previous | |
b820d2b8 AM |
3613 | parameters, we must save and restore it. */ |
3614 | save_area = save_fixed_argument_area (reg_parm_stack_space, argblock, | |
3615 | &low_to_save, &high_to_save); | |
3c0fca12 RH |
3616 | } |
3617 | #endif | |
f725a3ec | 3618 | |
3c0fca12 RH |
3619 | /* Push the args that need to be pushed. */ |
3620 | ||
3621 | /* ARGNUM indexes the ARGVEC array in the order in which the arguments | |
3622 | are to be pushed. */ | |
3623 | for (count = 0; count < nargs; count++, argnum += inc) | |
3624 | { | |
b3694847 SS |
3625 | enum machine_mode mode = argvec[argnum].mode; |
3626 | rtx val = argvec[argnum].value; | |
3c0fca12 RH |
3627 | rtx reg = argvec[argnum].reg; |
3628 | int partial = argvec[argnum].partial; | |
6bdf8c2e | 3629 | unsigned int parm_align = argvec[argnum].locate.boundary; |
f73ad30e | 3630 | int lower_bound = 0, upper_bound = 0, i; |
3c0fca12 RH |
3631 | |
3632 | if (! (reg != 0 && partial == 0)) | |
3633 | { | |
f73ad30e JH |
3634 | if (ACCUMULATE_OUTGOING_ARGS) |
3635 | { | |
f8a097cd JH |
3636 | /* If this is being stored into a pre-allocated, fixed-size, |
3637 | stack area, save any previous data at that location. */ | |
3c0fca12 RH |
3638 | |
3639 | #ifdef ARGS_GROW_DOWNWARD | |
f73ad30e JH |
3640 | /* stack_slot is negative, but we want to index stack_usage_map |
3641 | with positive values. */ | |
5bc0807c | 3642 | upper_bound = -argvec[argnum].locate.slot_offset.constant + 1; |
e7949876 | 3643 | lower_bound = upper_bound - argvec[argnum].locate.size.constant; |
3c0fca12 | 3644 | #else |
5bc0807c | 3645 | lower_bound = argvec[argnum].locate.slot_offset.constant; |
e7949876 | 3646 | upper_bound = lower_bound + argvec[argnum].locate.size.constant; |
3c0fca12 RH |
3647 | #endif |
3648 | ||
546ff777 AM |
3649 | i = lower_bound; |
3650 | /* Don't worry about things in the fixed argument area; | |
3651 | it has already been saved. */ | |
3652 | if (i < reg_parm_stack_space) | |
3653 | i = reg_parm_stack_space; | |
3654 | while (i < upper_bound && stack_usage_map[i] == 0) | |
3655 | i++; | |
3c0fca12 | 3656 | |
546ff777 | 3657 | if (i < upper_bound) |
f73ad30e | 3658 | { |
e7949876 AM |
3659 | /* We need to make a save area. */ |
3660 | unsigned int size | |
3661 | = argvec[argnum].locate.size.constant * BITS_PER_UNIT; | |
f73ad30e | 3662 | enum machine_mode save_mode |
e7949876 AM |
3663 | = mode_for_size (size, MODE_INT, 1); |
3664 | rtx adr | |
3665 | = plus_constant (argblock, | |
3666 | argvec[argnum].locate.offset.constant); | |
f73ad30e | 3667 | rtx stack_area |
e7949876 | 3668 | = gen_rtx_MEM (save_mode, memory_address (save_mode, adr)); |
f73ad30e | 3669 | |
9778f2f8 JH |
3670 | if (save_mode == BLKmode) |
3671 | { | |
3672 | argvec[argnum].save_area | |
3673 | = assign_stack_temp (BLKmode, | |
c22cacf3 | 3674 | argvec[argnum].locate.size.constant, |
9778f2f8 JH |
3675 | 0); |
3676 | ||
3677 | emit_block_move (validize_mem (argvec[argnum].save_area), | |
c22cacf3 | 3678 | stack_area, |
9778f2f8 JH |
3679 | GEN_INT (argvec[argnum].locate.size.constant), |
3680 | BLOCK_OP_CALL_PARM); | |
3681 | } | |
3682 | else | |
3683 | { | |
3684 | argvec[argnum].save_area = gen_reg_rtx (save_mode); | |
3685 | ||
3686 | emit_move_insn (argvec[argnum].save_area, stack_area); | |
3687 | } | |
f73ad30e | 3688 | } |
3c0fca12 | 3689 | } |
19caa751 | 3690 | |
6bdf8c2e | 3691 | emit_push_insn (val, mode, NULL_TREE, NULL_RTX, parm_align, |
44bb111a | 3692 | partial, reg, 0, argblock, |
e7949876 AM |
3693 | GEN_INT (argvec[argnum].locate.offset.constant), |
3694 | reg_parm_stack_space, | |
3695 | ARGS_SIZE_RTX (argvec[argnum].locate.alignment_pad)); | |
3c0fca12 | 3696 | |
3c0fca12 | 3697 | /* Now mark the segment we just used. */ |
f73ad30e JH |
3698 | if (ACCUMULATE_OUTGOING_ARGS) |
3699 | for (i = lower_bound; i < upper_bound; i++) | |
3700 | stack_usage_map[i] = 1; | |
3c0fca12 RH |
3701 | |
3702 | NO_DEFER_POP; | |
475a3eef | 3703 | |
0196c95e JJ |
3704 | if ((flags & ECF_CONST) |
3705 | || ((flags & ECF_PURE) && ACCUMULATE_OUTGOING_ARGS)) | |
475a3eef R |
3706 | { |
3707 | rtx use; | |
3708 | ||
3709 | /* Indicate argument access so that alias.c knows that these | |
3710 | values are live. */ | |
3711 | if (argblock) | |
3712 | use = plus_constant (argblock, | |
3713 | argvec[argnum].locate.offset.constant); | |
3714 | else | |
a4174ebf | 3715 | /* When arguments are pushed, trying to tell alias.c where |
475a3eef R |
3716 | exactly this argument is won't work, because the |
3717 | auto-increment causes confusion. So we merely indicate | |
3718 | that we access something with a known mode somewhere on | |
3719 | the stack. */ | |
c22cacf3 | 3720 | use = gen_rtx_PLUS (Pmode, virtual_outgoing_args_rtx, |
475a3eef R |
3721 | gen_rtx_SCRATCH (Pmode)); |
3722 | use = gen_rtx_MEM (argvec[argnum].mode, use); | |
3723 | use = gen_rtx_USE (VOIDmode, use); | |
3724 | call_fusage = gen_rtx_EXPR_LIST (VOIDmode, use, call_fusage); | |
3725 | } | |
3c0fca12 RH |
3726 | } |
3727 | } | |
3728 | ||
3c0fca12 RH |
3729 | /* If we pushed args in forward order, perform stack alignment |
3730 | after pushing the last arg. */ | |
f73ad30e | 3731 | if (argblock == 0 && !PUSH_ARGS_REVERSED) |
3c0fca12 RH |
3732 | anti_adjust_stack (GEN_INT (args_size.constant |
3733 | - original_args_size.constant)); | |
3c0fca12 | 3734 | |
f73ad30e JH |
3735 | if (PUSH_ARGS_REVERSED) |
3736 | argnum = nargs - 1; | |
3737 | else | |
3738 | argnum = 0; | |
3c0fca12 | 3739 | |
6de9cd9a | 3740 | fun = prepare_call_address (fun, NULL, &call_fusage, 0, 0); |
3c0fca12 RH |
3741 | |
3742 | /* Now load any reg parms into their regs. */ | |
3743 | ||
3744 | /* ARGNUM indexes the ARGVEC array in the order in which the arguments | |
3745 | are to be pushed. */ | |
3746 | for (count = 0; count < nargs; count++, argnum += inc) | |
3747 | { | |
ff15c351 | 3748 | enum machine_mode mode = argvec[argnum].mode; |
b3694847 | 3749 | rtx val = argvec[argnum].value; |
3c0fca12 RH |
3750 | rtx reg = argvec[argnum].reg; |
3751 | int partial = argvec[argnum].partial; | |
3752 | ||
3753 | /* Handle calls that pass values in multiple non-contiguous | |
3754 | locations. The PA64 has examples of this for library calls. */ | |
3755 | if (reg != 0 && GET_CODE (reg) == PARALLEL) | |
ff15c351 | 3756 | emit_group_load (reg, val, NULL_TREE, GET_MODE_SIZE (mode)); |
3c0fca12 RH |
3757 | else if (reg != 0 && partial == 0) |
3758 | emit_move_insn (reg, val); | |
3759 | ||
3760 | NO_DEFER_POP; | |
3761 | } | |
3762 | ||
3c0fca12 RH |
3763 | /* Any regs containing parms remain in use through the call. */ |
3764 | for (count = 0; count < nargs; count++) | |
3765 | { | |
3766 | rtx reg = argvec[count].reg; | |
3767 | if (reg != 0 && GET_CODE (reg) == PARALLEL) | |
3768 | use_group_regs (&call_fusage, reg); | |
3769 | else if (reg != 0) | |
3b1bf459 BS |
3770 | { |
3771 | int partial = argvec[count].partial; | |
3772 | if (partial) | |
3773 | { | |
3774 | int nregs; | |
3775 | gcc_assert (partial % UNITS_PER_WORD == 0); | |
3776 | nregs = partial / UNITS_PER_WORD; | |
3777 | use_regs (&call_fusage, REGNO (reg), nregs); | |
3778 | } | |
3779 | else | |
3780 | use_reg (&call_fusage, reg); | |
3781 | } | |
3c0fca12 RH |
3782 | } |
3783 | ||
3784 | /* Pass the function the address in which to return a structure value. */ | |
61f71b34 | 3785 | if (mem_value != 0 && struct_value != 0 && ! pcc_struct_value) |
3c0fca12 | 3786 | { |
61f71b34 | 3787 | emit_move_insn (struct_value, |
3c0fca12 RH |
3788 | force_reg (Pmode, |
3789 | force_operand (XEXP (mem_value, 0), | |
3790 | NULL_RTX))); | |
f8cfc6aa | 3791 | if (REG_P (struct_value)) |
61f71b34 | 3792 | use_reg (&call_fusage, struct_value); |
3c0fca12 RH |
3793 | } |
3794 | ||
3795 | /* Don't allow popping to be deferred, since then | |
3796 | cse'ing of library calls could delete a call and leave the pop. */ | |
3797 | NO_DEFER_POP; | |
5591ee6f | 3798 | valreg = (mem_value == 0 && outmode != VOIDmode |
390b17c2 | 3799 | ? hard_libcall_value (outmode, orgfun) : NULL_RTX); |
3c0fca12 | 3800 | |
ce48579b | 3801 | /* Stack must be properly aligned now. */ |
366de0ce NS |
3802 | gcc_assert (!(stack_pointer_delta |
3803 | & (PREFERRED_STACK_BOUNDARY / BITS_PER_UNIT - 1))); | |
ebcd0b57 | 3804 | |
695ee791 RH |
3805 | before_call = get_last_insn (); |
3806 | ||
3c0fca12 RH |
3807 | /* We pass the old value of inhibit_defer_pop + 1 to emit_call_1, which |
3808 | will set inhibit_defer_pop to that value. */ | |
de76b467 JH |
3809 | /* The return type is needed to decide how many bytes the function pops. |
3810 | Signedness plays no role in that, so for simplicity, we pretend it's | |
3811 | always signed. We also assume that the list of arguments passed has | |
3812 | no impact, so we pretend it is unknown. */ | |
3c0fca12 | 3813 | |
6de9cd9a | 3814 | emit_call_1 (fun, NULL, |
f725a3ec | 3815 | get_identifier (XSTR (orgfun, 0)), |
b0c48229 | 3816 | build_function_type (tfom, NULL_TREE), |
f725a3ec | 3817 | original_args_size.constant, args_size.constant, |
3c0fca12 RH |
3818 | struct_value_size, |
3819 | FUNCTION_ARG (args_so_far, VOIDmode, void_type_node, 1), | |
5591ee6f | 3820 | valreg, |
fa5322fa | 3821 | old_inhibit_defer_pop + 1, call_fusage, flags, & args_so_far); |
3c0fca12 | 3822 | |
6fb5fa3c DB |
3823 | /* For calls to `setjmp', etc., inform function.c:setjmp_warnings |
3824 | that it should complain if nonvolatile values are live. For | |
3825 | functions that cannot return, inform flow that control does not | |
3826 | fall through. */ | |
695ee791 | 3827 | |
6e14af16 | 3828 | if (flags & ECF_NORETURN) |
695ee791 | 3829 | { |
570a98eb | 3830 | /* The barrier note must be emitted |
695ee791 RH |
3831 | immediately after the CALL_INSN. Some ports emit more than |
3832 | just a CALL_INSN above, so we must search for it here. */ | |
3833 | ||
3834 | rtx last = get_last_insn (); | |
4b4bf941 | 3835 | while (!CALL_P (last)) |
695ee791 RH |
3836 | { |
3837 | last = PREV_INSN (last); | |
3838 | /* There was no CALL_INSN? */ | |
366de0ce | 3839 | gcc_assert (last != before_call); |
695ee791 RH |
3840 | } |
3841 | ||
570a98eb | 3842 | emit_barrier_after (last); |
695ee791 RH |
3843 | } |
3844 | ||
3c0fca12 RH |
3845 | /* Now restore inhibit_defer_pop to its actual original value. */ |
3846 | OK_DEFER_POP; | |
3847 | ||
3848 | pop_temp_slots (); | |
3849 | ||
3850 | /* Copy the value to the right place. */ | |
de76b467 | 3851 | if (outmode != VOIDmode && retval) |
3c0fca12 RH |
3852 | { |
3853 | if (mem_value) | |
3854 | { | |
3855 | if (value == 0) | |
3856 | value = mem_value; | |
3857 | if (value != mem_value) | |
3858 | emit_move_insn (value, mem_value); | |
3859 | } | |
c3297561 AO |
3860 | else if (GET_CODE (valreg) == PARALLEL) |
3861 | { | |
3862 | if (value == 0) | |
3863 | value = gen_reg_rtx (outmode); | |
643642eb | 3864 | emit_group_store (value, valreg, NULL_TREE, GET_MODE_SIZE (outmode)); |
c3297561 | 3865 | } |
3c0fca12 | 3866 | else |
7ab0aca2 | 3867 | { |
cde0f3fd | 3868 | /* Convert to the proper mode if a promotion has been active. */ |
7ab0aca2 RH |
3869 | if (GET_MODE (valreg) != outmode) |
3870 | { | |
3871 | int unsignedp = TYPE_UNSIGNED (tfom); | |
3872 | ||
cde0f3fd PB |
3873 | gcc_assert (promote_function_mode (tfom, outmode, &unsignedp, |
3874 | fndecl ? TREE_TYPE (fndecl) : fntype, 1) | |
7ab0aca2 | 3875 | == GET_MODE (valreg)); |
7ab0aca2 RH |
3876 | valreg = convert_modes (outmode, GET_MODE (valreg), valreg, 0); |
3877 | } | |
3878 | ||
3879 | if (value != 0) | |
3880 | emit_move_insn (value, valreg); | |
3881 | else | |
3882 | value = valreg; | |
3883 | } | |
3c0fca12 RH |
3884 | } |
3885 | ||
f73ad30e | 3886 | if (ACCUMULATE_OUTGOING_ARGS) |
3c0fca12 | 3887 | { |
f73ad30e JH |
3888 | #ifdef REG_PARM_STACK_SPACE |
3889 | if (save_area) | |
b820d2b8 AM |
3890 | restore_fixed_argument_area (save_area, argblock, |
3891 | high_to_save, low_to_save); | |
3c0fca12 | 3892 | #endif |
f725a3ec | 3893 | |
f73ad30e JH |
3894 | /* If we saved any argument areas, restore them. */ |
3895 | for (count = 0; count < nargs; count++) | |
3896 | if (argvec[count].save_area) | |
3897 | { | |
3898 | enum machine_mode save_mode = GET_MODE (argvec[count].save_area); | |
e7949876 AM |
3899 | rtx adr = plus_constant (argblock, |
3900 | argvec[count].locate.offset.constant); | |
3901 | rtx stack_area = gen_rtx_MEM (save_mode, | |
3902 | memory_address (save_mode, adr)); | |
f73ad30e | 3903 | |
9778f2f8 JH |
3904 | if (save_mode == BLKmode) |
3905 | emit_block_move (stack_area, | |
c22cacf3 | 3906 | validize_mem (argvec[count].save_area), |
9778f2f8 JH |
3907 | GEN_INT (argvec[count].locate.size.constant), |
3908 | BLOCK_OP_CALL_PARM); | |
3909 | else | |
3910 | emit_move_insn (stack_area, argvec[count].save_area); | |
f73ad30e | 3911 | } |
3c0fca12 | 3912 | |
f73ad30e JH |
3913 | highest_outgoing_arg_in_use = initial_highest_arg_in_use; |
3914 | stack_usage_map = initial_stack_usage_map; | |
3915 | } | |
43bc5f13 | 3916 | |
d9725c41 JJ |
3917 | if (stack_usage_map_buf) |
3918 | free (stack_usage_map_buf); | |
3919 | ||
de76b467 JH |
3920 | return value; |
3921 | ||
3922 | } | |
3923 | \f | |
3924 | /* Output a library call to function FUN (a SYMBOL_REF rtx) | |
3925 | (emitting the queue unless NO_QUEUE is nonzero), | |
3926 | for a value of mode OUTMODE, | |
3927 | with NARGS different arguments, passed as alternating rtx values | |
3928 | and machine_modes to convert them to. | |
de76b467 | 3929 | |
84b8030f KZ |
3930 | FN_TYPE should be LCT_NORMAL for `normal' calls, LCT_CONST for |
3931 | `const' calls, LCT_PURE for `pure' calls, or other LCT_ value for | |
3932 | other types of library calls. */ | |
de76b467 JH |
3933 | |
3934 | void | |
e34d07f2 KG |
3935 | emit_library_call (rtx orgfun, enum libcall_type fn_type, |
3936 | enum machine_mode outmode, int nargs, ...) | |
de76b467 | 3937 | { |
e34d07f2 | 3938 | va_list p; |
d329e058 | 3939 | |
e34d07f2 | 3940 | va_start (p, nargs); |
2a8f6b90 | 3941 | emit_library_call_value_1 (0, orgfun, NULL_RTX, fn_type, outmode, nargs, p); |
e34d07f2 | 3942 | va_end (p); |
de76b467 JH |
3943 | } |
3944 | \f | |
3945 | /* Like emit_library_call except that an extra argument, VALUE, | |
3946 | comes second and says where to store the result. | |
3947 | (If VALUE is zero, this function chooses a convenient way | |
3948 | to return the value. | |
3949 | ||
3950 | This function returns an rtx for where the value is to be found. | |
3951 | If VALUE is nonzero, VALUE is returned. */ | |
3952 | ||
3953 | rtx | |
e34d07f2 KG |
3954 | emit_library_call_value (rtx orgfun, rtx value, |
3955 | enum libcall_type fn_type, | |
3956 | enum machine_mode outmode, int nargs, ...) | |
de76b467 | 3957 | { |
6268b922 | 3958 | rtx result; |
e34d07f2 | 3959 | va_list p; |
d329e058 | 3960 | |
e34d07f2 | 3961 | va_start (p, nargs); |
6268b922 KG |
3962 | result = emit_library_call_value_1 (1, orgfun, value, fn_type, outmode, |
3963 | nargs, p); | |
e34d07f2 | 3964 | va_end (p); |
de76b467 | 3965 | |
6268b922 | 3966 | return result; |
322e3e34 RK |
3967 | } |
3968 | \f | |
51bbfa0c RS |
3969 | /* Store a single argument for a function call |
3970 | into the register or memory area where it must be passed. | |
3971 | *ARG describes the argument value and where to pass it. | |
3972 | ||
3973 | ARGBLOCK is the address of the stack-block for all the arguments, | |
d45cf215 | 3974 | or 0 on a machine where arguments are pushed individually. |
51bbfa0c RS |
3975 | |
3976 | MAY_BE_ALLOCA nonzero says this could be a call to `alloca' | |
f725a3ec | 3977 | so must be careful about how the stack is used. |
51bbfa0c RS |
3978 | |
3979 | VARIABLE_SIZE nonzero says that this was a variable-sized outgoing | |
3980 | argument stack. This is used if ACCUMULATE_OUTGOING_ARGS to indicate | |
3981 | that we need not worry about saving and restoring the stack. | |
3982 | ||
4c6b3b2a | 3983 | FNDECL is the declaration of the function we are calling. |
f725a3ec | 3984 | |
da7d8304 | 3985 | Return nonzero if this arg should cause sibcall failure, |
4c6b3b2a | 3986 | zero otherwise. */ |
51bbfa0c | 3987 | |
4c6b3b2a | 3988 | static int |
d329e058 AJ |
3989 | store_one_arg (struct arg_data *arg, rtx argblock, int flags, |
3990 | int variable_size ATTRIBUTE_UNUSED, int reg_parm_stack_space) | |
51bbfa0c | 3991 | { |
b3694847 | 3992 | tree pval = arg->tree_value; |
51bbfa0c RS |
3993 | rtx reg = 0; |
3994 | int partial = 0; | |
3995 | int used = 0; | |
6a651371 | 3996 | int i, lower_bound = 0, upper_bound = 0; |
4c6b3b2a | 3997 | int sibcall_failure = 0; |
51bbfa0c RS |
3998 | |
3999 | if (TREE_CODE (pval) == ERROR_MARK) | |
4c6b3b2a | 4000 | return 1; |
51bbfa0c | 4001 | |
cc79451b RK |
4002 | /* Push a new temporary level for any temporaries we make for |
4003 | this argument. */ | |
4004 | push_temp_slots (); | |
4005 | ||
f8a097cd | 4006 | if (ACCUMULATE_OUTGOING_ARGS && !(flags & ECF_SIBCALL)) |
51bbfa0c | 4007 | { |
f73ad30e JH |
4008 | /* If this is being stored into a pre-allocated, fixed-size, stack area, |
4009 | save any previous data at that location. */ | |
4010 | if (argblock && ! variable_size && arg->stack) | |
4011 | { | |
51bbfa0c | 4012 | #ifdef ARGS_GROW_DOWNWARD |
f73ad30e JH |
4013 | /* stack_slot is negative, but we want to index stack_usage_map |
4014 | with positive values. */ | |
4015 | if (GET_CODE (XEXP (arg->stack_slot, 0)) == PLUS) | |
4016 | upper_bound = -INTVAL (XEXP (XEXP (arg->stack_slot, 0), 1)) + 1; | |
4017 | else | |
4018 | upper_bound = 0; | |
51bbfa0c | 4019 | |
e7949876 | 4020 | lower_bound = upper_bound - arg->locate.size.constant; |
51bbfa0c | 4021 | #else |
f73ad30e JH |
4022 | if (GET_CODE (XEXP (arg->stack_slot, 0)) == PLUS) |
4023 | lower_bound = INTVAL (XEXP (XEXP (arg->stack_slot, 0), 1)); | |
4024 | else | |
4025 | lower_bound = 0; | |
51bbfa0c | 4026 | |
e7949876 | 4027 | upper_bound = lower_bound + arg->locate.size.constant; |
51bbfa0c RS |
4028 | #endif |
4029 | ||
546ff777 AM |
4030 | i = lower_bound; |
4031 | /* Don't worry about things in the fixed argument area; | |
4032 | it has already been saved. */ | |
4033 | if (i < reg_parm_stack_space) | |
4034 | i = reg_parm_stack_space; | |
4035 | while (i < upper_bound && stack_usage_map[i] == 0) | |
4036 | i++; | |
51bbfa0c | 4037 | |
546ff777 | 4038 | if (i < upper_bound) |
51bbfa0c | 4039 | { |
e7949876 AM |
4040 | /* We need to make a save area. */ |
4041 | unsigned int size = arg->locate.size.constant * BITS_PER_UNIT; | |
4042 | enum machine_mode save_mode = mode_for_size (size, MODE_INT, 1); | |
4043 | rtx adr = memory_address (save_mode, XEXP (arg->stack_slot, 0)); | |
4044 | rtx stack_area = gen_rtx_MEM (save_mode, adr); | |
f73ad30e JH |
4045 | |
4046 | if (save_mode == BLKmode) | |
4047 | { | |
1da68f56 RK |
4048 | tree ot = TREE_TYPE (arg->tree_value); |
4049 | tree nt = build_qualified_type (ot, (TYPE_QUALS (ot) | |
4050 | | TYPE_QUAL_CONST)); | |
4051 | ||
4052 | arg->save_area = assign_temp (nt, 0, 1, 1); | |
f73ad30e JH |
4053 | preserve_temp_slots (arg->save_area); |
4054 | emit_block_move (validize_mem (arg->save_area), stack_area, | |
7816b87e | 4055 | GEN_INT (arg->locate.size.constant), |
44bb111a | 4056 | BLOCK_OP_CALL_PARM); |
f73ad30e JH |
4057 | } |
4058 | else | |
4059 | { | |
4060 | arg->save_area = gen_reg_rtx (save_mode); | |
4061 | emit_move_insn (arg->save_area, stack_area); | |
4062 | } | |
51bbfa0c RS |
4063 | } |
4064 | } | |
4065 | } | |
b564df06 | 4066 | |
51bbfa0c RS |
4067 | /* If this isn't going to be placed on both the stack and in registers, |
4068 | set up the register and number of words. */ | |
4069 | if (! arg->pass_on_stack) | |
aa7634dd DM |
4070 | { |
4071 | if (flags & ECF_SIBCALL) | |
4072 | reg = arg->tail_call_reg; | |
4073 | else | |
4074 | reg = arg->reg; | |
4075 | partial = arg->partial; | |
4076 | } | |
51bbfa0c | 4077 | |
366de0ce NS |
4078 | /* Being passed entirely in a register. We shouldn't be called in |
4079 | this case. */ | |
4080 | gcc_assert (reg == 0 || partial != 0); | |
c22cacf3 | 4081 | |
4ab56118 RK |
4082 | /* If this arg needs special alignment, don't load the registers |
4083 | here. */ | |
4084 | if (arg->n_aligned_regs != 0) | |
4085 | reg = 0; | |
f725a3ec | 4086 | |
4ab56118 | 4087 | /* If this is being passed partially in a register, we can't evaluate |
51bbfa0c RS |
4088 | it directly into its stack slot. Otherwise, we can. */ |
4089 | if (arg->value == 0) | |
d64f5a78 | 4090 | { |
d64f5a78 RS |
4091 | /* stack_arg_under_construction is nonzero if a function argument is |
4092 | being evaluated directly into the outgoing argument list and | |
4093 | expand_call must take special action to preserve the argument list | |
4094 | if it is called recursively. | |
4095 | ||
4096 | For scalar function arguments stack_usage_map is sufficient to | |
4097 | determine which stack slots must be saved and restored. Scalar | |
4098 | arguments in general have pass_on_stack == 0. | |
4099 | ||
4100 | If this argument is initialized by a function which takes the | |
4101 | address of the argument (a C++ constructor or a C function | |
4102 | returning a BLKmode structure), then stack_usage_map is | |
4103 | insufficient and expand_call must push the stack around the | |
4104 | function call. Such arguments have pass_on_stack == 1. | |
4105 | ||
4106 | Note that it is always safe to set stack_arg_under_construction, | |
4107 | but this generates suboptimal code if set when not needed. */ | |
4108 | ||
4109 | if (arg->pass_on_stack) | |
4110 | stack_arg_under_construction++; | |
f73ad30e | 4111 | |
3a08477a RK |
4112 | arg->value = expand_expr (pval, |
4113 | (partial | |
4114 | || TYPE_MODE (TREE_TYPE (pval)) != arg->mode) | |
4115 | ? NULL_RTX : arg->stack, | |
8403445a | 4116 | VOIDmode, EXPAND_STACK_PARM); |
1efe6448 RK |
4117 | |
4118 | /* If we are promoting object (or for any other reason) the mode | |
4119 | doesn't agree, convert the mode. */ | |
4120 | ||
7373d92d RK |
4121 | if (arg->mode != TYPE_MODE (TREE_TYPE (pval))) |
4122 | arg->value = convert_modes (arg->mode, TYPE_MODE (TREE_TYPE (pval)), | |
4123 | arg->value, arg->unsignedp); | |
1efe6448 | 4124 | |
d64f5a78 RS |
4125 | if (arg->pass_on_stack) |
4126 | stack_arg_under_construction--; | |
d64f5a78 | 4127 | } |
51bbfa0c | 4128 | |
0dc42b03 | 4129 | /* Check for overlap with already clobbered argument area. */ |
07eef816 KH |
4130 | if ((flags & ECF_SIBCALL) |
4131 | && MEM_P (arg->value) | |
4132 | && mem_overlaps_already_clobbered_arg_p (XEXP (arg->value, 0), | |
4133 | arg->locate.size.constant)) | |
4134 | sibcall_failure = 1; | |
0dc42b03 | 4135 | |
51bbfa0c RS |
4136 | /* Don't allow anything left on stack from computation |
4137 | of argument to alloca. */ | |
f8a097cd | 4138 | if (flags & ECF_MAY_BE_ALLOCA) |
51bbfa0c RS |
4139 | do_pending_stack_adjust (); |
4140 | ||
4141 | if (arg->value == arg->stack) | |
37a08a29 RK |
4142 | /* If the value is already in the stack slot, we are done. */ |
4143 | ; | |
1efe6448 | 4144 | else if (arg->mode != BLKmode) |
51bbfa0c | 4145 | { |
b3694847 | 4146 | int size; |
46bd2bee | 4147 | unsigned int parm_align; |
51bbfa0c RS |
4148 | |
4149 | /* Argument is a scalar, not entirely passed in registers. | |
4150 | (If part is passed in registers, arg->partial says how much | |
4151 | and emit_push_insn will take care of putting it there.) | |
f725a3ec | 4152 | |
51bbfa0c RS |
4153 | Push it, and if its size is less than the |
4154 | amount of space allocated to it, | |
4155 | also bump stack pointer by the additional space. | |
4156 | Note that in C the default argument promotions | |
4157 | will prevent such mismatches. */ | |
4158 | ||
1efe6448 | 4159 | size = GET_MODE_SIZE (arg->mode); |
51bbfa0c RS |
4160 | /* Compute how much space the push instruction will push. |
4161 | On many machines, pushing a byte will advance the stack | |
4162 | pointer by a halfword. */ | |
4163 | #ifdef PUSH_ROUNDING | |
4164 | size = PUSH_ROUNDING (size); | |
4165 | #endif | |
4166 | used = size; | |
4167 | ||
4168 | /* Compute how much space the argument should get: | |
4169 | round up to a multiple of the alignment for arguments. */ | |
1efe6448 | 4170 | if (none != FUNCTION_ARG_PADDING (arg->mode, TREE_TYPE (pval))) |
51bbfa0c RS |
4171 | used = (((size + PARM_BOUNDARY / BITS_PER_UNIT - 1) |
4172 | / (PARM_BOUNDARY / BITS_PER_UNIT)) | |
4173 | * (PARM_BOUNDARY / BITS_PER_UNIT)); | |
4174 | ||
46bd2bee JM |
4175 | /* Compute the alignment of the pushed argument. */ |
4176 | parm_align = arg->locate.boundary; | |
4177 | if (FUNCTION_ARG_PADDING (arg->mode, TREE_TYPE (pval)) == downward) | |
4178 | { | |
4179 | int pad = used - size; | |
4180 | if (pad) | |
4181 | { | |
4182 | unsigned int pad_align = (pad & -pad) * BITS_PER_UNIT; | |
4183 | parm_align = MIN (parm_align, pad_align); | |
4184 | } | |
4185 | } | |
4186 | ||
51bbfa0c RS |
4187 | /* This isn't already where we want it on the stack, so put it there. |
4188 | This can either be done with push or copy insns. */ | |
d329e058 | 4189 | emit_push_insn (arg->value, arg->mode, TREE_TYPE (pval), NULL_RTX, |
46bd2bee | 4190 | parm_align, partial, reg, used - size, argblock, |
e7949876 AM |
4191 | ARGS_SIZE_RTX (arg->locate.offset), reg_parm_stack_space, |
4192 | ARGS_SIZE_RTX (arg->locate.alignment_pad)); | |
841404cd AO |
4193 | |
4194 | /* Unless this is a partially-in-register argument, the argument is now | |
4195 | in the stack. */ | |
4196 | if (partial == 0) | |
4197 | arg->value = arg->stack; | |
51bbfa0c RS |
4198 | } |
4199 | else | |
4200 | { | |
4201 | /* BLKmode, at least partly to be pushed. */ | |
4202 | ||
1b1f20ca | 4203 | unsigned int parm_align; |
b3694847 | 4204 | int excess; |
51bbfa0c RS |
4205 | rtx size_rtx; |
4206 | ||
4207 | /* Pushing a nonscalar. | |
4208 | If part is passed in registers, PARTIAL says how much | |
4209 | and emit_push_insn will take care of putting it there. */ | |
4210 | ||
4211 | /* Round its size up to a multiple | |
4212 | of the allocation unit for arguments. */ | |
4213 | ||
e7949876 | 4214 | if (arg->locate.size.var != 0) |
51bbfa0c RS |
4215 | { |
4216 | excess = 0; | |
e7949876 | 4217 | size_rtx = ARGS_SIZE_RTX (arg->locate.size); |
51bbfa0c RS |
4218 | } |
4219 | else | |
4220 | { | |
78a52f11 RH |
4221 | /* PUSH_ROUNDING has no effect on us, because emit_push_insn |
4222 | for BLKmode is careful to avoid it. */ | |
4223 | excess = (arg->locate.size.constant | |
4224 | - int_size_in_bytes (TREE_TYPE (pval)) | |
4225 | + partial); | |
db4c55f6 | 4226 | size_rtx = expand_expr (size_in_bytes (TREE_TYPE (pval)), |
bbbbb16a ILT |
4227 | NULL_RTX, TYPE_MODE (sizetype), |
4228 | EXPAND_NORMAL); | |
51bbfa0c RS |
4229 | } |
4230 | ||
bfc45551 | 4231 | parm_align = arg->locate.boundary; |
1b1f20ca RH |
4232 | |
4233 | /* When an argument is padded down, the block is aligned to | |
4234 | PARM_BOUNDARY, but the actual argument isn't. */ | |
4235 | if (FUNCTION_ARG_PADDING (arg->mode, TREE_TYPE (pval)) == downward) | |
4236 | { | |
e7949876 | 4237 | if (arg->locate.size.var) |
1b1f20ca RH |
4238 | parm_align = BITS_PER_UNIT; |
4239 | else if (excess) | |
4240 | { | |
97d05bfd | 4241 | unsigned int excess_align = (excess & -excess) * BITS_PER_UNIT; |
1b1f20ca RH |
4242 | parm_align = MIN (parm_align, excess_align); |
4243 | } | |
4244 | } | |
4245 | ||
3c0cb5de | 4246 | if ((flags & ECF_SIBCALL) && MEM_P (arg->value)) |
4c6b3b2a JJ |
4247 | { |
4248 | /* emit_push_insn might not work properly if arg->value and | |
e7949876 | 4249 | argblock + arg->locate.offset areas overlap. */ |
4c6b3b2a JJ |
4250 | rtx x = arg->value; |
4251 | int i = 0; | |
4252 | ||
38173d38 | 4253 | if (XEXP (x, 0) == crtl->args.internal_arg_pointer |
4c6b3b2a JJ |
4254 | || (GET_CODE (XEXP (x, 0)) == PLUS |
4255 | && XEXP (XEXP (x, 0), 0) == | |
38173d38 | 4256 | crtl->args.internal_arg_pointer |
481683e1 | 4257 | && CONST_INT_P (XEXP (XEXP (x, 0), 1)))) |
4c6b3b2a | 4258 | { |
38173d38 | 4259 | if (XEXP (x, 0) != crtl->args.internal_arg_pointer) |
4c6b3b2a JJ |
4260 | i = INTVAL (XEXP (XEXP (x, 0), 1)); |
4261 | ||
e0a21ab9 | 4262 | /* expand_call should ensure this. */ |
366de0ce | 4263 | gcc_assert (!arg->locate.offset.var |
d6c2c77c | 4264 | && arg->locate.size.var == 0 |
481683e1 | 4265 | && CONST_INT_P (size_rtx)); |
4c6b3b2a | 4266 | |
e7949876 | 4267 | if (arg->locate.offset.constant > i) |
4c6b3b2a | 4268 | { |
e7949876 | 4269 | if (arg->locate.offset.constant < i + INTVAL (size_rtx)) |
4c6b3b2a JJ |
4270 | sibcall_failure = 1; |
4271 | } | |
e7949876 | 4272 | else if (arg->locate.offset.constant < i) |
4c6b3b2a | 4273 | { |
d6c2c77c JC |
4274 | /* Use arg->locate.size.constant instead of size_rtx |
4275 | because we only care about the part of the argument | |
4276 | on the stack. */ | |
4277 | if (i < (arg->locate.offset.constant | |
4278 | + arg->locate.size.constant)) | |
4279 | sibcall_failure = 1; | |
4280 | } | |
4281 | else | |
4282 | { | |
4283 | /* Even though they appear to be at the same location, | |
4284 | if part of the outgoing argument is in registers, | |
4285 | they aren't really at the same location. Check for | |
4286 | this by making sure that the incoming size is the | |
4287 | same as the outgoing size. */ | |
4288 | if (arg->locate.size.constant != INTVAL (size_rtx)) | |
4c6b3b2a JJ |
4289 | sibcall_failure = 1; |
4290 | } | |
4291 | } | |
4292 | } | |
4293 | ||
1efe6448 | 4294 | emit_push_insn (arg->value, arg->mode, TREE_TYPE (pval), size_rtx, |
1b1f20ca | 4295 | parm_align, partial, reg, excess, argblock, |
e7949876 AM |
4296 | ARGS_SIZE_RTX (arg->locate.offset), reg_parm_stack_space, |
4297 | ARGS_SIZE_RTX (arg->locate.alignment_pad)); | |
51bbfa0c | 4298 | |
841404cd AO |
4299 | /* Unless this is a partially-in-register argument, the argument is now |
4300 | in the stack. | |
51bbfa0c | 4301 | |
841404cd AO |
4302 | ??? Unlike the case above, in which we want the actual |
4303 | address of the data, so that we can load it directly into a | |
4304 | register, here we want the address of the stack slot, so that | |
4305 | it's properly aligned for word-by-word copying or something | |
4306 | like that. It's not clear that this is always correct. */ | |
4307 | if (partial == 0) | |
4308 | arg->value = arg->stack_slot; | |
4309 | } | |
8df3dbb7 RH |
4310 | |
4311 | if (arg->reg && GET_CODE (arg->reg) == PARALLEL) | |
4312 | { | |
4313 | tree type = TREE_TYPE (arg->tree_value); | |
4314 | arg->parallel_value | |
4315 | = emit_group_load_into_temps (arg->reg, arg->value, type, | |
4316 | int_size_in_bytes (type)); | |
4317 | } | |
51bbfa0c | 4318 | |
8403445a AM |
4319 | /* Mark all slots this store used. */ |
4320 | if (ACCUMULATE_OUTGOING_ARGS && !(flags & ECF_SIBCALL) | |
4321 | && argblock && ! variable_size && arg->stack) | |
4322 | for (i = lower_bound; i < upper_bound; i++) | |
4323 | stack_usage_map[i] = 1; | |
4324 | ||
51bbfa0c RS |
4325 | /* Once we have pushed something, pops can't safely |
4326 | be deferred during the rest of the arguments. */ | |
4327 | NO_DEFER_POP; | |
4328 | ||
db907e7b RK |
4329 | /* Free any temporary slots made in processing this argument. Show |
4330 | that we might have taken the address of something and pushed that | |
4331 | as an operand. */ | |
4332 | preserve_temp_slots (NULL_RTX); | |
51bbfa0c | 4333 | free_temp_slots (); |
cc79451b | 4334 | pop_temp_slots (); |
4c6b3b2a JJ |
4335 | |
4336 | return sibcall_failure; | |
51bbfa0c | 4337 | } |
a4b1b92a | 4338 | |
fe984136 | 4339 | /* Nonzero if we do not know how to pass TYPE solely in registers. */ |
a4b1b92a | 4340 | |
fe984136 RH |
4341 | bool |
4342 | must_pass_in_stack_var_size (enum machine_mode mode ATTRIBUTE_UNUSED, | |
586de218 | 4343 | const_tree type) |
fe984136 RH |
4344 | { |
4345 | if (!type) | |
4346 | return false; | |
4347 | ||
4348 | /* If the type has variable size... */ | |
4349 | if (TREE_CODE (TYPE_SIZE (type)) != INTEGER_CST) | |
4350 | return true; | |
a4b1b92a | 4351 | |
fe984136 RH |
4352 | /* If the type is marked as addressable (it is required |
4353 | to be constructed into the stack)... */ | |
4354 | if (TREE_ADDRESSABLE (type)) | |
4355 | return true; | |
4356 | ||
4357 | return false; | |
4358 | } | |
a4b1b92a | 4359 | |
7ae4ad28 | 4360 | /* Another version of the TARGET_MUST_PASS_IN_STACK hook. This one |
fe984136 RH |
4361 | takes trailing padding of a structure into account. */ |
4362 | /* ??? Should be able to merge these two by examining BLOCK_REG_PADDING. */ | |
a4b1b92a RH |
4363 | |
4364 | bool | |
586de218 | 4365 | must_pass_in_stack_var_size_or_pad (enum machine_mode mode, const_tree type) |
a4b1b92a RH |
4366 | { |
4367 | if (!type) | |
40cdfd5a | 4368 | return false; |
a4b1b92a RH |
4369 | |
4370 | /* If the type has variable size... */ | |
4371 | if (TREE_CODE (TYPE_SIZE (type)) != INTEGER_CST) | |
4372 | return true; | |
4373 | ||
4374 | /* If the type is marked as addressable (it is required | |
4375 | to be constructed into the stack)... */ | |
4376 | if (TREE_ADDRESSABLE (type)) | |
4377 | return true; | |
4378 | ||
4379 | /* If the padding and mode of the type is such that a copy into | |
4380 | a register would put it into the wrong part of the register. */ | |
4381 | if (mode == BLKmode | |
4382 | && int_size_in_bytes (type) % (PARM_BOUNDARY / BITS_PER_UNIT) | |
4383 | && (FUNCTION_ARG_PADDING (mode, type) | |
4384 | == (BYTES_BIG_ENDIAN ? upward : downward))) | |
4385 | return true; | |
4386 | ||
4387 | return false; | |
4388 | } |