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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, |
46bd2bee | 3 | 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007 |
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 | |
10 | Software Foundation; either version 2, or (at your option) any later | |
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 | |
1322177d | 19 | along with GCC; see the file COPYING. If not, write to the Free |
366ccddb KC |
20 | Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA |
21 | 02110-1301, USA. */ | |
51bbfa0c RS |
22 | |
23 | #include "config.h" | |
670ee920 | 24 | #include "system.h" |
4977bab6 ZW |
25 | #include "coretypes.h" |
26 | #include "tm.h" | |
670ee920 KG |
27 | #include "rtl.h" |
28 | #include "tree.h" | |
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" |
51bbfa0c | 44 | |
c795bca9 BS |
45 | /* Like PREFERRED_STACK_BOUNDARY but in units of bytes, not bits. */ |
46 | #define STACK_BYTES (PREFERRED_STACK_BOUNDARY / BITS_PER_UNIT) | |
51bbfa0c RS |
47 | |
48 | /* Data structure and subroutines used within expand_call. */ | |
49 | ||
50 | struct arg_data | |
51 | { | |
52 | /* Tree node for this argument. */ | |
53 | tree tree_value; | |
1efe6448 RK |
54 | /* Mode for value; TYPE_MODE unless promoted. */ |
55 | enum machine_mode mode; | |
51bbfa0c RS |
56 | /* Current RTL value for argument, or 0 if it isn't precomputed. */ |
57 | rtx value; | |
58 | /* Initially-compute RTL value for argument; only for const functions. */ | |
59 | rtx initial_value; | |
60 | /* Register to pass this argument in, 0 if passed on stack, or an | |
cacbd532 | 61 | PARALLEL if the arg is to be copied into multiple non-contiguous |
51bbfa0c RS |
62 | registers. */ |
63 | rtx reg; | |
099e9712 JH |
64 | /* Register to pass this argument in when generating tail call sequence. |
65 | This is not the same register as for normal calls on machines with | |
66 | register windows. */ | |
67 | rtx tail_call_reg; | |
8df3dbb7 RH |
68 | /* If REG is a PARALLEL, this is a copy of VALUE pulled into the correct |
69 | form for emit_group_move. */ | |
70 | rtx parallel_value; | |
84b55618 RK |
71 | /* If REG was promoted from the actual mode of the argument expression, |
72 | indicates whether the promotion is sign- or zero-extended. */ | |
73 | int unsignedp; | |
f0078f86 AM |
74 | /* Number of bytes to put in registers. 0 means put the whole arg |
75 | in registers. Also 0 if not passed in registers. */ | |
51bbfa0c | 76 | int partial; |
da7d8304 | 77 | /* Nonzero if argument must be passed on stack. |
d64f5a78 RS |
78 | Note that some arguments may be passed on the stack |
79 | even though pass_on_stack is zero, just because FUNCTION_ARG says so. | |
80 | pass_on_stack identifies arguments that *cannot* go in registers. */ | |
51bbfa0c | 81 | int pass_on_stack; |
e7949876 AM |
82 | /* Some fields packaged up for locate_and_pad_parm. */ |
83 | struct locate_and_pad_arg_data locate; | |
51bbfa0c RS |
84 | /* Location on the stack at which parameter should be stored. The store |
85 | has already been done if STACK == VALUE. */ | |
86 | rtx stack; | |
87 | /* Location on the stack of the start of this argument slot. This can | |
88 | differ from STACK if this arg pads downward. This location is known | |
89 | to be aligned to FUNCTION_ARG_BOUNDARY. */ | |
90 | rtx stack_slot; | |
51bbfa0c RS |
91 | /* Place that this stack area has been saved, if needed. */ |
92 | rtx save_area; | |
4ab56118 RK |
93 | /* If an argument's alignment does not permit direct copying into registers, |
94 | copy in smaller-sized pieces into pseudos. These are stored in a | |
95 | block pointed to by this field. The next field says how many | |
96 | word-sized pseudos we made. */ | |
97 | rtx *aligned_regs; | |
98 | int n_aligned_regs; | |
51bbfa0c RS |
99 | }; |
100 | ||
da7d8304 | 101 | /* A vector of one char per byte of stack space. A byte if nonzero if |
51bbfa0c RS |
102 | the corresponding stack location has been used. |
103 | This vector is used to prevent a function call within an argument from | |
104 | clobbering any stack already set up. */ | |
105 | static char *stack_usage_map; | |
106 | ||
107 | /* Size of STACK_USAGE_MAP. */ | |
108 | static int highest_outgoing_arg_in_use; | |
2f4aa534 | 109 | |
c67846f2 JJ |
110 | /* A bitmap of virtual-incoming stack space. Bit is set if the corresponding |
111 | stack location's tail call argument has been already stored into the stack. | |
112 | This bitmap is used to prevent sibling call optimization if function tries | |
113 | to use parent's incoming argument slots when they have been already | |
114 | overwritten with tail call arguments. */ | |
115 | static sbitmap stored_args_map; | |
116 | ||
2f4aa534 RS |
117 | /* stack_arg_under_construction is nonzero when an argument may be |
118 | initialized with a constructor call (including a C function that | |
119 | returns a BLKmode struct) and expand_call must take special action | |
120 | to make sure the object being constructed does not overlap the | |
121 | argument list for the constructor call. */ | |
0405cc0e | 122 | static int stack_arg_under_construction; |
51bbfa0c | 123 | |
6de9cd9a | 124 | static void emit_call_1 (rtx, tree, tree, tree, HOST_WIDE_INT, HOST_WIDE_INT, |
d329e058 AJ |
125 | HOST_WIDE_INT, rtx, rtx, int, rtx, int, |
126 | CUMULATIVE_ARGS *); | |
127 | static void precompute_register_parameters (int, struct arg_data *, int *); | |
128 | static int store_one_arg (struct arg_data *, rtx, int, int, int); | |
129 | static void store_unaligned_arguments_into_pseudos (struct arg_data *, int); | |
130 | static int finalize_must_preallocate (int, int, struct arg_data *, | |
131 | struct args_size *); | |
132 | static void precompute_arguments (int, int, struct arg_data *); | |
133 | static int compute_argument_block_size (int, struct args_size *, int); | |
134 | static void initialize_argument_information (int, struct arg_data *, | |
078a18a4 SL |
135 | struct args_size *, int, |
136 | tree, tree, | |
d329e058 | 137 | tree, CUMULATIVE_ARGS *, int, |
dd292d0a | 138 | rtx *, int *, int *, int *, |
6de9cd9a | 139 | bool *, bool); |
d329e058 AJ |
140 | static void compute_argument_addresses (struct arg_data *, rtx, int); |
141 | static rtx rtx_for_function_call (tree, tree); | |
142 | static void load_register_parameters (struct arg_data *, int, rtx *, int, | |
143 | int, int *); | |
144 | static rtx emit_library_call_value_1 (int, rtx, rtx, enum libcall_type, | |
145 | enum machine_mode, int, va_list); | |
146 | static int special_function_p (tree, int); | |
d329e058 AJ |
147 | static int check_sibcall_argument_overlap_1 (rtx); |
148 | static int check_sibcall_argument_overlap (rtx, struct arg_data *, int); | |
149 | ||
150 | static int combine_pending_stack_adjustment_and_call (int, struct args_size *, | |
95899b34 | 151 | unsigned int); |
2f2b4a02 | 152 | static tree split_complex_types (tree); |
21a3b983 | 153 | |
f73ad30e | 154 | #ifdef REG_PARM_STACK_SPACE |
d329e058 AJ |
155 | static rtx save_fixed_argument_area (int, rtx, int *, int *); |
156 | static void restore_fixed_argument_area (rtx, rtx, int, int); | |
20efdf74 | 157 | #endif |
51bbfa0c | 158 | \f |
51bbfa0c RS |
159 | /* Force FUNEXP into a form suitable for the address of a CALL, |
160 | and return that as an rtx. Also load the static chain register | |
161 | if FNDECL is a nested function. | |
162 | ||
77cac2f2 RK |
163 | CALL_FUSAGE points to a variable holding the prospective |
164 | CALL_INSN_FUNCTION_USAGE information. */ | |
51bbfa0c | 165 | |
03dacb02 | 166 | rtx |
6de9cd9a DN |
167 | prepare_call_address (rtx funexp, rtx static_chain_value, |
168 | rtx *call_fusage, int reg_parm_seen, int sibcallp) | |
51bbfa0c | 169 | { |
ba228239 | 170 | /* Make a valid memory address and copy constants through pseudo-regs, |
51bbfa0c RS |
171 | but not for a constant address if -fno-function-cse. */ |
172 | if (GET_CODE (funexp) != SYMBOL_REF) | |
01368078 | 173 | /* If we are using registers for parameters, force the |
e9a25f70 JL |
174 | function address into a register now. */ |
175 | funexp = ((SMALL_REGISTER_CLASSES && reg_parm_seen) | |
176 | ? force_not_mem (memory_address (FUNCTION_MODE, funexp)) | |
177 | : memory_address (FUNCTION_MODE, funexp)); | |
3affaf29 | 178 | else if (! sibcallp) |
51bbfa0c RS |
179 | { |
180 | #ifndef NO_FUNCTION_CSE | |
181 | if (optimize && ! flag_no_function_cse) | |
082a099c | 182 | funexp = force_reg (Pmode, funexp); |
51bbfa0c RS |
183 | #endif |
184 | } | |
185 | ||
186 | if (static_chain_value != 0) | |
187 | { | |
5e89a381 | 188 | static_chain_value = convert_memory_address (Pmode, static_chain_value); |
51bbfa0c RS |
189 | emit_move_insn (static_chain_rtx, static_chain_value); |
190 | ||
f8cfc6aa | 191 | if (REG_P (static_chain_rtx)) |
f991a240 | 192 | use_reg (call_fusage, static_chain_rtx); |
51bbfa0c RS |
193 | } |
194 | ||
195 | return funexp; | |
196 | } | |
197 | ||
198 | /* Generate instructions to call function FUNEXP, | |
199 | and optionally pop the results. | |
200 | The CALL_INSN is the first insn generated. | |
201 | ||
607ea900 | 202 | FNDECL is the declaration node of the function. This is given to the |
2c8da025 RK |
203 | macro RETURN_POPS_ARGS to determine whether this function pops its own args. |
204 | ||
334c4f0f RK |
205 | FUNTYPE is the data type of the function. This is given to the macro |
206 | RETURN_POPS_ARGS to determine whether this function pops its own args. | |
207 | We used to allow an identifier for library functions, but that doesn't | |
208 | work when the return type is an aggregate type and the calling convention | |
209 | says that the pointer to this aggregate is to be popped by the callee. | |
51bbfa0c RS |
210 | |
211 | STACK_SIZE is the number of bytes of arguments on the stack, | |
c2732da3 JM |
212 | ROUNDED_STACK_SIZE is that number rounded up to |
213 | PREFERRED_STACK_BOUNDARY; zero if the size is variable. This is | |
214 | both to put into the call insn and to generate explicit popping | |
215 | code if necessary. | |
51bbfa0c RS |
216 | |
217 | STRUCT_VALUE_SIZE is the number of bytes wanted in a structure value. | |
218 | It is zero if this call doesn't want a structure value. | |
219 | ||
220 | NEXT_ARG_REG is the rtx that results from executing | |
221 | FUNCTION_ARG (args_so_far, VOIDmode, void_type_node, 1) | |
222 | just after all the args have had their registers assigned. | |
223 | This could be whatever you like, but normally it is the first | |
224 | arg-register beyond those used for args in this call, | |
225 | or 0 if all the arg-registers are used in this call. | |
226 | It is passed on to `gen_call' so you can put this info in the call insn. | |
227 | ||
228 | VALREG is a hard register in which a value is returned, | |
229 | or 0 if the call does not return a value. | |
230 | ||
231 | OLD_INHIBIT_DEFER_POP is the value that `inhibit_defer_pop' had before | |
232 | the args to this call were processed. | |
233 | We restore `inhibit_defer_pop' to that value. | |
234 | ||
94b25f81 | 235 | CALL_FUSAGE is either empty or an EXPR_LIST of USE expressions that |
6d2f8887 | 236 | denote registers used by the called function. */ |
f725a3ec | 237 | |
322e3e34 | 238 | static void |
6de9cd9a DN |
239 | emit_call_1 (rtx funexp, tree fntree, tree fndecl ATTRIBUTE_UNUSED, |
240 | tree funtype ATTRIBUTE_UNUSED, | |
d329e058 AJ |
241 | HOST_WIDE_INT stack_size ATTRIBUTE_UNUSED, |
242 | HOST_WIDE_INT rounded_stack_size, | |
243 | HOST_WIDE_INT struct_value_size ATTRIBUTE_UNUSED, | |
244 | rtx next_arg_reg ATTRIBUTE_UNUSED, rtx valreg, | |
245 | int old_inhibit_defer_pop, rtx call_fusage, int ecf_flags, | |
246 | CUMULATIVE_ARGS *args_so_far ATTRIBUTE_UNUSED) | |
51bbfa0c | 247 | { |
062e7fd8 | 248 | rtx rounded_stack_size_rtx = GEN_INT (rounded_stack_size); |
51bbfa0c RS |
249 | rtx call_insn; |
250 | int already_popped = 0; | |
fb5eebb9 | 251 | HOST_WIDE_INT n_popped = RETURN_POPS_ARGS (fndecl, funtype, stack_size); |
f45c9d95 ZW |
252 | #if defined (HAVE_call) && defined (HAVE_call_value) |
253 | rtx struct_value_size_rtx; | |
254 | struct_value_size_rtx = GEN_INT (struct_value_size); | |
255 | #endif | |
51bbfa0c | 256 | |
fa5322fa AO |
257 | #ifdef CALL_POPS_ARGS |
258 | n_popped += CALL_POPS_ARGS (* args_so_far); | |
259 | #endif | |
d329e058 | 260 | |
51bbfa0c RS |
261 | /* Ensure address is valid. SYMBOL_REF is already valid, so no need, |
262 | and we don't want to load it into a register as an optimization, | |
263 | because prepare_call_address already did it if it should be done. */ | |
264 | if (GET_CODE (funexp) != SYMBOL_REF) | |
265 | funexp = memory_address (FUNCTION_MODE, funexp); | |
266 | ||
0a1c58a2 JL |
267 | #if defined (HAVE_sibcall_pop) && defined (HAVE_sibcall_value_pop) |
268 | if ((ecf_flags & ECF_SIBCALL) | |
269 | && HAVE_sibcall_pop && HAVE_sibcall_value_pop | |
f132f529 | 270 | && (n_popped > 0 || stack_size == 0)) |
0a1c58a2 | 271 | { |
8ac61af7 | 272 | rtx n_pop = GEN_INT (n_popped); |
0a1c58a2 JL |
273 | rtx pat; |
274 | ||
275 | /* If this subroutine pops its own args, record that in the call insn | |
276 | if possible, for the sake of frame pointer elimination. */ | |
277 | ||
278 | if (valreg) | |
f45c9d95 | 279 | pat = GEN_SIBCALL_VALUE_POP (valreg, |
0a1c58a2 JL |
280 | gen_rtx_MEM (FUNCTION_MODE, funexp), |
281 | rounded_stack_size_rtx, next_arg_reg, | |
282 | n_pop); | |
283 | else | |
f45c9d95 | 284 | pat = GEN_SIBCALL_POP (gen_rtx_MEM (FUNCTION_MODE, funexp), |
0a1c58a2 JL |
285 | rounded_stack_size_rtx, next_arg_reg, n_pop); |
286 | ||
287 | emit_call_insn (pat); | |
288 | already_popped = 1; | |
289 | } | |
290 | else | |
291 | #endif | |
292 | ||
51bbfa0c | 293 | #if defined (HAVE_call_pop) && defined (HAVE_call_value_pop) |
8ac61af7 RK |
294 | /* If the target has "call" or "call_value" insns, then prefer them |
295 | if no arguments are actually popped. If the target does not have | |
296 | "call" or "call_value" insns, then we must use the popping versions | |
297 | even if the call has no arguments to pop. */ | |
8bcafee3 JDA |
298 | #if defined (HAVE_call) && defined (HAVE_call_value) |
299 | if (HAVE_call && HAVE_call_value && HAVE_call_pop && HAVE_call_value_pop | |
7393c642 | 300 | && n_popped > 0 && ! (ecf_flags & ECF_SP_DEPRESSED)) |
8bcafee3 JDA |
301 | #else |
302 | if (HAVE_call_pop && HAVE_call_value_pop) | |
303 | #endif | |
51bbfa0c | 304 | { |
fb5eebb9 | 305 | rtx n_pop = GEN_INT (n_popped); |
51bbfa0c RS |
306 | rtx pat; |
307 | ||
308 | /* If this subroutine pops its own args, record that in the call insn | |
309 | if possible, for the sake of frame pointer elimination. */ | |
2c8da025 | 310 | |
51bbfa0c | 311 | if (valreg) |
f45c9d95 | 312 | pat = GEN_CALL_VALUE_POP (valreg, |
38a448ca | 313 | gen_rtx_MEM (FUNCTION_MODE, funexp), |
062e7fd8 | 314 | rounded_stack_size_rtx, next_arg_reg, n_pop); |
51bbfa0c | 315 | else |
f45c9d95 | 316 | pat = GEN_CALL_POP (gen_rtx_MEM (FUNCTION_MODE, funexp), |
062e7fd8 | 317 | rounded_stack_size_rtx, next_arg_reg, n_pop); |
51bbfa0c RS |
318 | |
319 | emit_call_insn (pat); | |
320 | already_popped = 1; | |
321 | } | |
322 | else | |
323 | #endif | |
51bbfa0c | 324 | |
0a1c58a2 JL |
325 | #if defined (HAVE_sibcall) && defined (HAVE_sibcall_value) |
326 | if ((ecf_flags & ECF_SIBCALL) | |
327 | && HAVE_sibcall && HAVE_sibcall_value) | |
328 | { | |
329 | if (valreg) | |
f45c9d95 | 330 | emit_call_insn (GEN_SIBCALL_VALUE (valreg, |
0a1c58a2 JL |
331 | gen_rtx_MEM (FUNCTION_MODE, funexp), |
332 | rounded_stack_size_rtx, | |
333 | next_arg_reg, NULL_RTX)); | |
334 | else | |
f45c9d95 | 335 | emit_call_insn (GEN_SIBCALL (gen_rtx_MEM (FUNCTION_MODE, funexp), |
0a1c58a2 JL |
336 | rounded_stack_size_rtx, next_arg_reg, |
337 | struct_value_size_rtx)); | |
338 | } | |
339 | else | |
340 | #endif | |
341 | ||
51bbfa0c RS |
342 | #if defined (HAVE_call) && defined (HAVE_call_value) |
343 | if (HAVE_call && HAVE_call_value) | |
344 | { | |
345 | if (valreg) | |
f45c9d95 | 346 | emit_call_insn (GEN_CALL_VALUE (valreg, |
38a448ca | 347 | gen_rtx_MEM (FUNCTION_MODE, funexp), |
062e7fd8 | 348 | rounded_stack_size_rtx, next_arg_reg, |
e992302c | 349 | NULL_RTX)); |
51bbfa0c | 350 | else |
f45c9d95 | 351 | emit_call_insn (GEN_CALL (gen_rtx_MEM (FUNCTION_MODE, funexp), |
062e7fd8 | 352 | rounded_stack_size_rtx, next_arg_reg, |
51bbfa0c RS |
353 | struct_value_size_rtx)); |
354 | } | |
355 | else | |
356 | #endif | |
366de0ce | 357 | gcc_unreachable (); |
51bbfa0c | 358 | |
ee960939 OH |
359 | /* Find the call we just emitted. */ |
360 | call_insn = last_call_insn (); | |
51bbfa0c | 361 | |
2a8f6b90 JH |
362 | /* Mark memory as used for "pure" function call. */ |
363 | if (ecf_flags & ECF_PURE) | |
8ac61af7 RK |
364 | call_fusage |
365 | = gen_rtx_EXPR_LIST | |
366 | (VOIDmode, | |
367 | gen_rtx_USE (VOIDmode, | |
368 | gen_rtx_MEM (BLKmode, gen_rtx_SCRATCH (VOIDmode))), | |
369 | call_fusage); | |
2a8f6b90 | 370 | |
ee960939 OH |
371 | /* Put the register usage information there. */ |
372 | add_function_usage_to (call_insn, call_fusage); | |
51bbfa0c RS |
373 | |
374 | /* If this is a const call, then set the insn's unchanging bit. */ | |
2a8f6b90 | 375 | if (ecf_flags & (ECF_CONST | ECF_PURE)) |
24a28584 | 376 | CONST_OR_PURE_CALL_P (call_insn) = 1; |
51bbfa0c | 377 | |
12a22e76 JM |
378 | /* If this call can't throw, attach a REG_EH_REGION reg note to that |
379 | effect. */ | |
0a1c58a2 | 380 | if (ecf_flags & ECF_NOTHROW) |
54cea123 | 381 | REG_NOTES (call_insn) = gen_rtx_EXPR_LIST (REG_EH_REGION, const0_rtx, |
12a22e76 | 382 | REG_NOTES (call_insn)); |
b2dd096b | 383 | else |
6de9cd9a DN |
384 | { |
385 | int rn = lookup_stmt_eh_region (fntree); | |
386 | ||
387 | /* If rn < 0, then either (1) tree-ssa not used or (2) doesn't | |
388 | throw, which we already took care of. */ | |
389 | if (rn > 0) | |
390 | REG_NOTES (call_insn) = gen_rtx_EXPR_LIST (REG_EH_REGION, GEN_INT (rn), | |
391 | REG_NOTES (call_insn)); | |
392 | note_current_region_may_contain_throw (); | |
393 | } | |
12a22e76 | 394 | |
ca3920ad JW |
395 | if (ecf_flags & ECF_NORETURN) |
396 | REG_NOTES (call_insn) = gen_rtx_EXPR_LIST (REG_NORETURN, const0_rtx, | |
397 | REG_NOTES (call_insn)); | |
398 | ||
570a98eb | 399 | if (ecf_flags & ECF_RETURNS_TWICE) |
9defc9b7 RH |
400 | { |
401 | REG_NOTES (call_insn) = gen_rtx_EXPR_LIST (REG_SETJMP, const0_rtx, | |
c22cacf3 | 402 | REG_NOTES (call_insn)); |
9defc9b7 RH |
403 | current_function_calls_setjmp = 1; |
404 | } | |
570a98eb | 405 | |
0a1c58a2 JL |
406 | SIBLING_CALL_P (call_insn) = ((ecf_flags & ECF_SIBCALL) != 0); |
407 | ||
b1e64e0d RS |
408 | /* Restore this now, so that we do defer pops for this call's args |
409 | if the context of the call as a whole permits. */ | |
410 | inhibit_defer_pop = old_inhibit_defer_pop; | |
411 | ||
fb5eebb9 | 412 | if (n_popped > 0) |
51bbfa0c RS |
413 | { |
414 | if (!already_popped) | |
e3da301d | 415 | CALL_INSN_FUNCTION_USAGE (call_insn) |
38a448ca RH |
416 | = gen_rtx_EXPR_LIST (VOIDmode, |
417 | gen_rtx_CLOBBER (VOIDmode, stack_pointer_rtx), | |
418 | CALL_INSN_FUNCTION_USAGE (call_insn)); | |
fb5eebb9 | 419 | rounded_stack_size -= n_popped; |
062e7fd8 | 420 | rounded_stack_size_rtx = GEN_INT (rounded_stack_size); |
1503a7ec | 421 | stack_pointer_delta -= n_popped; |
51bbfa0c RS |
422 | } |
423 | ||
f73ad30e | 424 | if (!ACCUMULATE_OUTGOING_ARGS) |
51bbfa0c | 425 | { |
f73ad30e JH |
426 | /* If returning from the subroutine does not automatically pop the args, |
427 | we need an instruction to pop them sooner or later. | |
428 | Perhaps do it now; perhaps just record how much space to pop later. | |
429 | ||
430 | If returning from the subroutine does pop the args, indicate that the | |
431 | stack pointer will be changed. */ | |
432 | ||
f79a65c0 | 433 | if (rounded_stack_size != 0) |
f73ad30e | 434 | { |
6e14af16 | 435 | if (ecf_flags & (ECF_SP_DEPRESSED | ECF_NORETURN)) |
f79a65c0 RK |
436 | /* Just pretend we did the pop. */ |
437 | stack_pointer_delta -= rounded_stack_size; | |
438 | else if (flag_defer_pop && inhibit_defer_pop == 0 | |
7393c642 | 439 | && ! (ecf_flags & (ECF_CONST | ECF_PURE))) |
f73ad30e JH |
440 | pending_stack_adjust += rounded_stack_size; |
441 | else | |
442 | adjust_stack (rounded_stack_size_rtx); | |
443 | } | |
51bbfa0c | 444 | } |
f73ad30e JH |
445 | /* When we accumulate outgoing args, we must avoid any stack manipulations. |
446 | Restore the stack pointer to its original value now. Usually | |
447 | ACCUMULATE_OUTGOING_ARGS targets don't get here, but there are exceptions. | |
448 | On i386 ACCUMULATE_OUTGOING_ARGS can be enabled on demand, and | |
449 | popping variants of functions exist as well. | |
450 | ||
451 | ??? We may optimize similar to defer_pop above, but it is | |
452 | probably not worthwhile. | |
f725a3ec | 453 | |
f73ad30e JH |
454 | ??? It will be worthwhile to enable combine_stack_adjustments even for |
455 | such machines. */ | |
456 | else if (n_popped) | |
457 | anti_adjust_stack (GEN_INT (n_popped)); | |
51bbfa0c RS |
458 | } |
459 | ||
20efdf74 JL |
460 | /* Determine if the function identified by NAME and FNDECL is one with |
461 | special properties we wish to know about. | |
462 | ||
463 | For example, if the function might return more than one time (setjmp), then | |
464 | set RETURNS_TWICE to a nonzero value. | |
465 | ||
bae802f9 | 466 | Similarly set NORETURN if the function is in the longjmp family. |
20efdf74 | 467 | |
20efdf74 JL |
468 | Set MAY_BE_ALLOCA for any memory allocation function that might allocate |
469 | space from the stack such as alloca. */ | |
470 | ||
f2d33f13 | 471 | static int |
d329e058 | 472 | special_function_p (tree fndecl, int flags) |
20efdf74 | 473 | { |
6de9cd9a | 474 | if (fndecl && DECL_NAME (fndecl) |
140592a0 | 475 | && IDENTIFIER_LENGTH (DECL_NAME (fndecl)) <= 17 |
20efdf74 JL |
476 | /* Exclude functions not at the file scope, or not `extern', |
477 | since they are not the magic functions we would otherwise | |
d1bd0ded | 478 | think they are. |
c22cacf3 MS |
479 | FIXME: this should be handled with attributes, not with this |
480 | hacky imitation of DECL_ASSEMBLER_NAME. It's (also) wrong | |
481 | because you can declare fork() inside a function if you | |
482 | wish. */ | |
7ae4ad28 | 483 | && (DECL_CONTEXT (fndecl) == NULL_TREE |
d1bd0ded GK |
484 | || TREE_CODE (DECL_CONTEXT (fndecl)) == TRANSLATION_UNIT_DECL) |
485 | && TREE_PUBLIC (fndecl)) | |
20efdf74 | 486 | { |
63ad61ed ZW |
487 | const char *name = IDENTIFIER_POINTER (DECL_NAME (fndecl)); |
488 | const char *tname = name; | |
20efdf74 | 489 | |
ca54603f JL |
490 | /* We assume that alloca will always be called by name. It |
491 | makes no sense to pass it as a pointer-to-function to | |
492 | anything that does not understand its behavior. */ | |
f2d33f13 JH |
493 | if (((IDENTIFIER_LENGTH (DECL_NAME (fndecl)) == 6 |
494 | && name[0] == 'a' | |
495 | && ! strcmp (name, "alloca")) | |
496 | || (IDENTIFIER_LENGTH (DECL_NAME (fndecl)) == 16 | |
497 | && name[0] == '_' | |
498 | && ! strcmp (name, "__builtin_alloca")))) | |
499 | flags |= ECF_MAY_BE_ALLOCA; | |
ca54603f | 500 | |
20efdf74 JL |
501 | /* Disregard prefix _, __ or __x. */ |
502 | if (name[0] == '_') | |
503 | { | |
504 | if (name[1] == '_' && name[2] == 'x') | |
505 | tname += 3; | |
506 | else if (name[1] == '_') | |
507 | tname += 2; | |
508 | else | |
509 | tname += 1; | |
510 | } | |
511 | ||
512 | if (tname[0] == 's') | |
513 | { | |
f2d33f13 JH |
514 | if ((tname[1] == 'e' |
515 | && (! strcmp (tname, "setjmp") | |
516 | || ! strcmp (tname, "setjmp_syscall"))) | |
517 | || (tname[1] == 'i' | |
518 | && ! strcmp (tname, "sigsetjmp")) | |
519 | || (tname[1] == 'a' | |
520 | && ! strcmp (tname, "savectx"))) | |
521 | flags |= ECF_RETURNS_TWICE; | |
522 | ||
20efdf74 JL |
523 | if (tname[1] == 'i' |
524 | && ! strcmp (tname, "siglongjmp")) | |
6e14af16 | 525 | flags |= ECF_NORETURN; |
20efdf74 JL |
526 | } |
527 | else if ((tname[0] == 'q' && tname[1] == 's' | |
528 | && ! strcmp (tname, "qsetjmp")) | |
529 | || (tname[0] == 'v' && tname[1] == 'f' | |
cd9ed4b4 EB |
530 | && ! strcmp (tname, "vfork")) |
531 | || (tname[0] == 'g' && tname[1] == 'e' | |
532 | && !strcmp (tname, "getcontext"))) | |
f2d33f13 | 533 | flags |= ECF_RETURNS_TWICE; |
20efdf74 JL |
534 | |
535 | else if (tname[0] == 'l' && tname[1] == 'o' | |
536 | && ! strcmp (tname, "longjmp")) | |
6e14af16 | 537 | flags |= ECF_NORETURN; |
20efdf74 | 538 | } |
d1c38823 | 539 | |
f2d33f13 | 540 | return flags; |
20efdf74 JL |
541 | } |
542 | ||
bae802f9 | 543 | /* Return nonzero when FNDECL represents a call to setjmp. */ |
7393c642 | 544 | |
f2d33f13 | 545 | int |
d329e058 | 546 | setjmp_call_p (tree fndecl) |
f2d33f13 JH |
547 | { |
548 | return special_function_p (fndecl, 0) & ECF_RETURNS_TWICE; | |
549 | } | |
550 | ||
c986baf6 JH |
551 | /* Return true when exp contains alloca call. */ |
552 | bool | |
d329e058 | 553 | alloca_call_p (tree exp) |
c986baf6 JH |
554 | { |
555 | if (TREE_CODE (exp) == CALL_EXPR | |
5039610b SL |
556 | && TREE_CODE (CALL_EXPR_FN (exp)) == ADDR_EXPR |
557 | && (TREE_CODE (TREE_OPERAND (CALL_EXPR_FN (exp), 0)) == FUNCTION_DECL) | |
558 | && (special_function_p (TREE_OPERAND (CALL_EXPR_FN (exp), 0), 0) | |
559 | & ECF_MAY_BE_ALLOCA)) | |
c986baf6 JH |
560 | return true; |
561 | return false; | |
562 | } | |
563 | ||
b5cd4ed4 | 564 | /* Detect flags (function attributes) from the function decl or type node. */ |
7393c642 | 565 | |
4977bab6 | 566 | int |
d329e058 | 567 | flags_from_decl_or_type (tree exp) |
f2d33f13 JH |
568 | { |
569 | int flags = 0; | |
b5cd4ed4 | 570 | tree type = exp; |
36dbb93d | 571 | |
f2d33f13 JH |
572 | if (DECL_P (exp)) |
573 | { | |
b5cd4ed4 RK |
574 | type = TREE_TYPE (exp); |
575 | ||
f2d33f13 | 576 | /* The function exp may have the `malloc' attribute. */ |
36dbb93d | 577 | if (DECL_IS_MALLOC (exp)) |
f2d33f13 JH |
578 | flags |= ECF_MALLOC; |
579 | ||
6e9a3221 AN |
580 | /* The function exp may have the `returns_twice' attribute. */ |
581 | if (DECL_IS_RETURNS_TWICE (exp)) | |
582 | flags |= ECF_RETURNS_TWICE; | |
583 | ||
2a8f6b90 | 584 | /* The function exp may have the `pure' attribute. */ |
36dbb93d | 585 | if (DECL_IS_PURE (exp)) |
e238ccac | 586 | flags |= ECF_PURE; |
2a8f6b90 | 587 | |
dcd6de6d ZD |
588 | if (DECL_IS_NOVOPS (exp)) |
589 | flags |= ECF_NOVOPS; | |
590 | ||
f2d33f13 JH |
591 | if (TREE_NOTHROW (exp)) |
592 | flags |= ECF_NOTHROW; | |
2b187c63 MM |
593 | |
594 | if (TREE_READONLY (exp) && ! TREE_THIS_VOLATILE (exp)) | |
e238ccac | 595 | flags |= ECF_CONST; |
6de9cd9a DN |
596 | |
597 | flags = special_function_p (exp, flags); | |
f2d33f13 | 598 | } |
4f976745 | 599 | else if (TYPE_P (exp) && TYPE_READONLY (exp) && ! TREE_THIS_VOLATILE (exp)) |
2b187c63 | 600 | flags |= ECF_CONST; |
f2d33f13 JH |
601 | |
602 | if (TREE_THIS_VOLATILE (exp)) | |
603 | flags |= ECF_NORETURN; | |
604 | ||
b5cd4ed4 RK |
605 | /* Mark if the function returns with the stack pointer depressed. We |
606 | cannot consider it pure or constant in that case. */ | |
607 | if (TREE_CODE (type) == FUNCTION_TYPE && TYPE_RETURNS_STACK_DEPRESSED (type)) | |
608 | { | |
609 | flags |= ECF_SP_DEPRESSED; | |
e238ccac | 610 | flags &= ~(ECF_PURE | ECF_CONST); |
b5cd4ed4 RK |
611 | } |
612 | ||
f2d33f13 JH |
613 | return flags; |
614 | } | |
615 | ||
f027e0a2 JM |
616 | /* Detect flags from a CALL_EXPR. */ |
617 | ||
618 | int | |
619 | call_expr_flags (tree t) | |
620 | { | |
621 | int flags; | |
622 | tree decl = get_callee_fndecl (t); | |
623 | ||
624 | if (decl) | |
625 | flags = flags_from_decl_or_type (decl); | |
626 | else | |
627 | { | |
5039610b | 628 | t = TREE_TYPE (CALL_EXPR_FN (t)); |
f027e0a2 JM |
629 | if (t && TREE_CODE (t) == POINTER_TYPE) |
630 | flags = flags_from_decl_or_type (TREE_TYPE (t)); | |
631 | else | |
632 | flags = 0; | |
633 | } | |
634 | ||
635 | return flags; | |
636 | } | |
637 | ||
20efdf74 JL |
638 | /* Precompute all register parameters as described by ARGS, storing values |
639 | into fields within the ARGS array. | |
640 | ||
641 | NUM_ACTUALS indicates the total number elements in the ARGS array. | |
642 | ||
643 | Set REG_PARM_SEEN if we encounter a register parameter. */ | |
644 | ||
645 | static void | |
27e29549 RH |
646 | precompute_register_parameters (int num_actuals, struct arg_data *args, |
647 | int *reg_parm_seen) | |
20efdf74 JL |
648 | { |
649 | int i; | |
650 | ||
651 | *reg_parm_seen = 0; | |
652 | ||
653 | for (i = 0; i < num_actuals; i++) | |
654 | if (args[i].reg != 0 && ! args[i].pass_on_stack) | |
655 | { | |
656 | *reg_parm_seen = 1; | |
657 | ||
658 | if (args[i].value == 0) | |
659 | { | |
660 | push_temp_slots (); | |
84217346 | 661 | args[i].value = expand_normal (args[i].tree_value); |
20efdf74 JL |
662 | preserve_temp_slots (args[i].value); |
663 | pop_temp_slots (); | |
20efdf74 JL |
664 | } |
665 | ||
fd1e5d25 RH |
666 | /* If the value is a non-legitimate constant, force it into a |
667 | pseudo now. TLS symbols sometimes need a call to resolve. */ | |
668 | if (CONSTANT_P (args[i].value) | |
669 | && !LEGITIMATE_CONSTANT_P (args[i].value)) | |
670 | args[i].value = force_reg (args[i].mode, args[i].value); | |
671 | ||
20efdf74 JL |
672 | /* If we are to promote the function arg to a wider mode, |
673 | do it now. */ | |
674 | ||
675 | if (args[i].mode != TYPE_MODE (TREE_TYPE (args[i].tree_value))) | |
676 | args[i].value | |
677 | = convert_modes (args[i].mode, | |
678 | TYPE_MODE (TREE_TYPE (args[i].tree_value)), | |
679 | args[i].value, args[i].unsignedp); | |
680 | ||
27e29549 RH |
681 | /* If we're going to have to load the value by parts, pull the |
682 | parts into pseudos. The part extraction process can involve | |
683 | non-trivial computation. */ | |
684 | if (GET_CODE (args[i].reg) == PARALLEL) | |
685 | { | |
686 | tree type = TREE_TYPE (args[i].tree_value); | |
8df3dbb7 | 687 | args[i].parallel_value |
27e29549 RH |
688 | = emit_group_load_into_temps (args[i].reg, args[i].value, |
689 | type, int_size_in_bytes (type)); | |
690 | } | |
691 | ||
f725a3ec | 692 | /* If the value is expensive, and we are inside an appropriately |
20efdf74 JL |
693 | short loop, put the value into a pseudo and then put the pseudo |
694 | into the hard reg. | |
695 | ||
696 | For small register classes, also do this if this call uses | |
697 | register parameters. This is to avoid reload conflicts while | |
698 | loading the parameters registers. */ | |
699 | ||
27e29549 RH |
700 | else if ((! (REG_P (args[i].value) |
701 | || (GET_CODE (args[i].value) == SUBREG | |
702 | && REG_P (SUBREG_REG (args[i].value))))) | |
703 | && args[i].mode != BLKmode | |
704 | && rtx_cost (args[i].value, SET) > COSTS_N_INSNS (1) | |
705 | && ((SMALL_REGISTER_CLASSES && *reg_parm_seen) | |
706 | || optimize)) | |
20efdf74 JL |
707 | args[i].value = copy_to_mode_reg (args[i].mode, args[i].value); |
708 | } | |
709 | } | |
710 | ||
f73ad30e | 711 | #ifdef REG_PARM_STACK_SPACE |
20efdf74 JL |
712 | |
713 | /* The argument list is the property of the called routine and it | |
714 | may clobber it. If the fixed area has been used for previous | |
715 | parameters, we must save and restore it. */ | |
3bdf5ad1 | 716 | |
20efdf74 | 717 | static rtx |
d329e058 | 718 | save_fixed_argument_area (int reg_parm_stack_space, rtx argblock, int *low_to_save, int *high_to_save) |
20efdf74 | 719 | { |
b820d2b8 AM |
720 | int low; |
721 | int high; | |
20efdf74 | 722 | |
b820d2b8 AM |
723 | /* Compute the boundary of the area that needs to be saved, if any. */ |
724 | high = reg_parm_stack_space; | |
20efdf74 | 725 | #ifdef ARGS_GROW_DOWNWARD |
b820d2b8 | 726 | high += 1; |
20efdf74 | 727 | #endif |
b820d2b8 AM |
728 | if (high > highest_outgoing_arg_in_use) |
729 | high = highest_outgoing_arg_in_use; | |
20efdf74 | 730 | |
b820d2b8 AM |
731 | for (low = 0; low < high; low++) |
732 | if (stack_usage_map[low] != 0) | |
733 | { | |
734 | int num_to_save; | |
735 | enum machine_mode save_mode; | |
736 | int delta; | |
737 | rtx stack_area; | |
738 | rtx save_area; | |
20efdf74 | 739 | |
b820d2b8 AM |
740 | while (stack_usage_map[--high] == 0) |
741 | ; | |
20efdf74 | 742 | |
b820d2b8 AM |
743 | *low_to_save = low; |
744 | *high_to_save = high; | |
745 | ||
746 | num_to_save = high - low + 1; | |
747 | save_mode = mode_for_size (num_to_save * BITS_PER_UNIT, MODE_INT, 1); | |
20efdf74 | 748 | |
b820d2b8 AM |
749 | /* If we don't have the required alignment, must do this |
750 | in BLKmode. */ | |
751 | if ((low & (MIN (GET_MODE_SIZE (save_mode), | |
752 | BIGGEST_ALIGNMENT / UNITS_PER_WORD) - 1))) | |
753 | save_mode = BLKmode; | |
20efdf74 JL |
754 | |
755 | #ifdef ARGS_GROW_DOWNWARD | |
b820d2b8 | 756 | delta = -high; |
20efdf74 | 757 | #else |
b820d2b8 | 758 | delta = low; |
20efdf74 | 759 | #endif |
b820d2b8 AM |
760 | stack_area = gen_rtx_MEM (save_mode, |
761 | memory_address (save_mode, | |
762 | plus_constant (argblock, | |
763 | delta))); | |
8ac61af7 | 764 | |
b820d2b8 AM |
765 | set_mem_align (stack_area, PARM_BOUNDARY); |
766 | if (save_mode == BLKmode) | |
767 | { | |
768 | save_area = assign_stack_temp (BLKmode, num_to_save, 0); | |
769 | emit_block_move (validize_mem (save_area), stack_area, | |
770 | GEN_INT (num_to_save), BLOCK_OP_CALL_PARM); | |
771 | } | |
772 | else | |
773 | { | |
774 | save_area = gen_reg_rtx (save_mode); | |
775 | emit_move_insn (save_area, stack_area); | |
776 | } | |
8ac61af7 | 777 | |
b820d2b8 AM |
778 | return save_area; |
779 | } | |
780 | ||
781 | return NULL_RTX; | |
20efdf74 JL |
782 | } |
783 | ||
784 | static void | |
d329e058 | 785 | restore_fixed_argument_area (rtx save_area, rtx argblock, int high_to_save, int low_to_save) |
20efdf74 JL |
786 | { |
787 | enum machine_mode save_mode = GET_MODE (save_area); | |
b820d2b8 AM |
788 | int delta; |
789 | rtx stack_area; | |
790 | ||
20efdf74 | 791 | #ifdef ARGS_GROW_DOWNWARD |
b820d2b8 | 792 | delta = -high_to_save; |
20efdf74 | 793 | #else |
b820d2b8 | 794 | delta = low_to_save; |
20efdf74 | 795 | #endif |
b820d2b8 AM |
796 | stack_area = gen_rtx_MEM (save_mode, |
797 | memory_address (save_mode, | |
798 | plus_constant (argblock, delta))); | |
799 | set_mem_align (stack_area, PARM_BOUNDARY); | |
20efdf74 JL |
800 | |
801 | if (save_mode != BLKmode) | |
802 | emit_move_insn (stack_area, save_area); | |
803 | else | |
44bb111a RH |
804 | emit_block_move (stack_area, validize_mem (save_area), |
805 | GEN_INT (high_to_save - low_to_save + 1), | |
806 | BLOCK_OP_CALL_PARM); | |
20efdf74 | 807 | } |
19652adf | 808 | #endif /* REG_PARM_STACK_SPACE */ |
f725a3ec | 809 | |
20efdf74 JL |
810 | /* If any elements in ARGS refer to parameters that are to be passed in |
811 | registers, but not in memory, and whose alignment does not permit a | |
812 | direct copy into registers. Copy the values into a group of pseudos | |
f725a3ec | 813 | which we will later copy into the appropriate hard registers. |
8e6a59fe MM |
814 | |
815 | Pseudos for each unaligned argument will be stored into the array | |
816 | args[argnum].aligned_regs. The caller is responsible for deallocating | |
817 | the aligned_regs array if it is nonzero. */ | |
818 | ||
20efdf74 | 819 | static void |
d329e058 | 820 | store_unaligned_arguments_into_pseudos (struct arg_data *args, int num_actuals) |
20efdf74 JL |
821 | { |
822 | int i, j; | |
f725a3ec | 823 | |
20efdf74 JL |
824 | for (i = 0; i < num_actuals; i++) |
825 | if (args[i].reg != 0 && ! args[i].pass_on_stack | |
826 | && args[i].mode == BLKmode | |
827 | && (TYPE_ALIGN (TREE_TYPE (args[i].tree_value)) | |
828 | < (unsigned int) MIN (BIGGEST_ALIGNMENT, BITS_PER_WORD))) | |
829 | { | |
830 | int bytes = int_size_in_bytes (TREE_TYPE (args[i].tree_value)); | |
6e985040 | 831 | int endian_correction = 0; |
20efdf74 | 832 | |
78a52f11 RH |
833 | if (args[i].partial) |
834 | { | |
835 | gcc_assert (args[i].partial % UNITS_PER_WORD == 0); | |
836 | args[i].n_aligned_regs = args[i].partial / UNITS_PER_WORD; | |
837 | } | |
838 | else | |
839 | { | |
840 | args[i].n_aligned_regs | |
841 | = (bytes + UNITS_PER_WORD - 1) / UNITS_PER_WORD; | |
842 | } | |
843 | ||
5ed6ace5 | 844 | args[i].aligned_regs = XNEWVEC (rtx, args[i].n_aligned_regs); |
20efdf74 | 845 | |
6e985040 AM |
846 | /* Structures smaller than a word are normally aligned to the |
847 | least significant byte. On a BYTES_BIG_ENDIAN machine, | |
20efdf74 JL |
848 | this means we must skip the empty high order bytes when |
849 | calculating the bit offset. */ | |
6e985040 AM |
850 | if (bytes < UNITS_PER_WORD |
851 | #ifdef BLOCK_REG_PADDING | |
852 | && (BLOCK_REG_PADDING (args[i].mode, | |
853 | TREE_TYPE (args[i].tree_value), 1) | |
854 | == downward) | |
855 | #else | |
856 | && BYTES_BIG_ENDIAN | |
857 | #endif | |
858 | ) | |
859 | endian_correction = BITS_PER_WORD - bytes * BITS_PER_UNIT; | |
20efdf74 JL |
860 | |
861 | for (j = 0; j < args[i].n_aligned_regs; j++) | |
862 | { | |
863 | rtx reg = gen_reg_rtx (word_mode); | |
864 | rtx word = operand_subword_force (args[i].value, j, BLKmode); | |
865 | int bitsize = MIN (bytes * BITS_PER_UNIT, BITS_PER_WORD); | |
20efdf74 JL |
866 | |
867 | args[i].aligned_regs[j] = reg; | |
6e985040 | 868 | word = extract_bit_field (word, bitsize, 0, 1, NULL_RTX, |
b3520980 | 869 | word_mode, word_mode); |
20efdf74 JL |
870 | |
871 | /* There is no need to restrict this code to loading items | |
872 | in TYPE_ALIGN sized hunks. The bitfield instructions can | |
873 | load up entire word sized registers efficiently. | |
874 | ||
875 | ??? This may not be needed anymore. | |
876 | We use to emit a clobber here but that doesn't let later | |
877 | passes optimize the instructions we emit. By storing 0 into | |
878 | the register later passes know the first AND to zero out the | |
879 | bitfield being set in the register is unnecessary. The store | |
880 | of 0 will be deleted as will at least the first AND. */ | |
881 | ||
882 | emit_move_insn (reg, const0_rtx); | |
883 | ||
884 | bytes -= bitsize / BITS_PER_UNIT; | |
6e985040 | 885 | store_bit_field (reg, bitsize, endian_correction, word_mode, |
b3520980 | 886 | word); |
20efdf74 JL |
887 | } |
888 | } | |
889 | } | |
890 | ||
d7cdf113 | 891 | /* Fill in ARGS_SIZE and ARGS array based on the parameters found in |
078a18a4 | 892 | CALL_EXPR EXP. |
d7cdf113 JL |
893 | |
894 | NUM_ACTUALS is the total number of parameters. | |
895 | ||
896 | N_NAMED_ARGS is the total number of named arguments. | |
897 | ||
078a18a4 SL |
898 | STRUCT_VALUE_ADDR_VALUE is the implicit argument for a struct return |
899 | value, or null. | |
900 | ||
d7cdf113 JL |
901 | FNDECL is the tree code for the target of this call (if known) |
902 | ||
903 | ARGS_SO_FAR holds state needed by the target to know where to place | |
904 | the next argument. | |
905 | ||
906 | REG_PARM_STACK_SPACE is the number of bytes of stack space reserved | |
907 | for arguments which are passed in registers. | |
908 | ||
909 | OLD_STACK_LEVEL is a pointer to an rtx which olds the old stack level | |
910 | and may be modified by this routine. | |
911 | ||
f2d33f13 | 912 | OLD_PENDING_ADJ, MUST_PREALLOCATE and FLAGS are pointers to integer |
7ae4ad28 | 913 | flags which may may be modified by this routine. |
dd292d0a | 914 | |
6de9cd9a DN |
915 | MAY_TAILCALL is cleared if we encounter an invisible pass-by-reference |
916 | that requires allocation of stack space. | |
917 | ||
dd292d0a MM |
918 | CALL_FROM_THUNK_P is true if this call is the jump from a thunk to |
919 | the thunked-to function. */ | |
d7cdf113 JL |
920 | |
921 | static void | |
d329e058 AJ |
922 | initialize_argument_information (int num_actuals ATTRIBUTE_UNUSED, |
923 | struct arg_data *args, | |
924 | struct args_size *args_size, | |
925 | int n_named_args ATTRIBUTE_UNUSED, | |
078a18a4 SL |
926 | tree exp, tree struct_value_addr_value, |
927 | tree fndecl, | |
d329e058 AJ |
928 | CUMULATIVE_ARGS *args_so_far, |
929 | int reg_parm_stack_space, | |
930 | rtx *old_stack_level, int *old_pending_adj, | |
dd292d0a | 931 | int *must_preallocate, int *ecf_flags, |
6de9cd9a | 932 | bool *may_tailcall, bool call_from_thunk_p) |
d7cdf113 JL |
933 | { |
934 | /* 1 if scanning parms front to back, -1 if scanning back to front. */ | |
935 | int inc; | |
936 | ||
937 | /* Count arg position in order args appear. */ | |
938 | int argpos; | |
939 | ||
940 | int i; | |
f725a3ec | 941 | |
d7cdf113 JL |
942 | args_size->constant = 0; |
943 | args_size->var = 0; | |
944 | ||
945 | /* In this loop, we consider args in the order they are written. | |
946 | We fill up ARGS from the front or from the back if necessary | |
947 | so that in any case the first arg to be pushed ends up at the front. */ | |
948 | ||
f73ad30e JH |
949 | if (PUSH_ARGS_REVERSED) |
950 | { | |
951 | i = num_actuals - 1, inc = -1; | |
952 | /* In this case, must reverse order of args | |
953 | so that we compute and push the last arg first. */ | |
954 | } | |
955 | else | |
956 | { | |
957 | i = 0, inc = 1; | |
958 | } | |
d7cdf113 | 959 | |
078a18a4 SL |
960 | /* First fill in the actual arguments in the ARGS array, splitting |
961 | complex arguments if necessary. */ | |
962 | { | |
963 | int j = i; | |
964 | call_expr_arg_iterator iter; | |
965 | tree arg; | |
966 | ||
967 | if (struct_value_addr_value) | |
968 | { | |
969 | args[j].tree_value = struct_value_addr_value; | |
970 | j += inc; | |
971 | } | |
972 | FOR_EACH_CALL_EXPR_ARG (arg, iter, exp) | |
973 | { | |
974 | tree argtype = TREE_TYPE (arg); | |
975 | if (targetm.calls.split_complex_arg | |
976 | && argtype | |
977 | && TREE_CODE (argtype) == COMPLEX_TYPE | |
978 | && targetm.calls.split_complex_arg (argtype)) | |
979 | { | |
980 | tree subtype = TREE_TYPE (argtype); | |
981 | arg = save_expr (arg); | |
982 | args[j].tree_value = build1 (REALPART_EXPR, subtype, arg); | |
983 | j += inc; | |
984 | args[j].tree_value = build1 (IMAGPART_EXPR, subtype, arg); | |
985 | } | |
986 | else | |
987 | args[j].tree_value = arg; | |
988 | j += inc; | |
989 | } | |
990 | } | |
991 | ||
d7cdf113 | 992 | /* I counts args in order (to be) pushed; ARGPOS counts in order written. */ |
078a18a4 | 993 | for (argpos = 0; argpos < num_actuals; i += inc, argpos++) |
d7cdf113 | 994 | { |
078a18a4 | 995 | tree type = TREE_TYPE (args[i].tree_value); |
d7cdf113 JL |
996 | int unsignedp; |
997 | enum machine_mode mode; | |
998 | ||
d7cdf113 | 999 | /* Replace erroneous argument with constant zero. */ |
d0f062fb | 1000 | if (type == error_mark_node || !COMPLETE_TYPE_P (type)) |
d7cdf113 JL |
1001 | args[i].tree_value = integer_zero_node, type = integer_type_node; |
1002 | ||
1003 | /* If TYPE is a transparent union, pass things the way we would | |
1004 | pass the first field of the union. We have already verified that | |
1005 | the modes are the same. */ | |
2bf105ab | 1006 | if (TREE_CODE (type) == UNION_TYPE && TYPE_TRANSPARENT_UNION (type)) |
d7cdf113 JL |
1007 | type = TREE_TYPE (TYPE_FIELDS (type)); |
1008 | ||
1009 | /* Decide where to pass this arg. | |
1010 | ||
1011 | args[i].reg is nonzero if all or part is passed in registers. | |
1012 | ||
1013 | args[i].partial is nonzero if part but not all is passed in registers, | |
78a52f11 | 1014 | and the exact value says how many bytes are passed in registers. |
d7cdf113 JL |
1015 | |
1016 | args[i].pass_on_stack is nonzero if the argument must at least be | |
1017 | computed on the stack. It may then be loaded back into registers | |
1018 | if args[i].reg is nonzero. | |
1019 | ||
1020 | These decisions are driven by the FUNCTION_... macros and must agree | |
1021 | with those made by function.c. */ | |
1022 | ||
1023 | /* See if this argument should be passed by invisible reference. */ | |
0976078c RH |
1024 | if (pass_by_reference (args_so_far, TYPE_MODE (type), |
1025 | type, argpos < n_named_args)) | |
d7cdf113 | 1026 | { |
9969aaf6 RH |
1027 | bool callee_copies; |
1028 | tree base; | |
1029 | ||
1030 | callee_copies | |
6cdd5672 RH |
1031 | = reference_callee_copied (args_so_far, TYPE_MODE (type), |
1032 | type, argpos < n_named_args); | |
9969aaf6 RH |
1033 | |
1034 | /* If we're compiling a thunk, pass through invisible references | |
1035 | instead of making a copy. */ | |
dd292d0a | 1036 | if (call_from_thunk_p |
9969aaf6 RH |
1037 | || (callee_copies |
1038 | && !TREE_ADDRESSABLE (type) | |
1039 | && (base = get_base_address (args[i].tree_value)) | |
1040 | && (!DECL_P (base) || MEM_P (DECL_RTL (base))))) | |
d7cdf113 | 1041 | { |
9969aaf6 RH |
1042 | /* We can't use sibcalls if a callee-copied argument is |
1043 | stored in the current function's frame. */ | |
1044 | if (!call_from_thunk_p && DECL_P (base) && !TREE_STATIC (base)) | |
9fd47435 RS |
1045 | *may_tailcall = false; |
1046 | ||
9969aaf6 RH |
1047 | args[i].tree_value = build_fold_addr_expr (args[i].tree_value); |
1048 | type = TREE_TYPE (args[i].tree_value); | |
1049 | ||
1050 | *ecf_flags &= ~(ECF_CONST | ECF_LIBCALL_BLOCK); | |
f21add07 | 1051 | } |
d7cdf113 JL |
1052 | else |
1053 | { | |
1054 | /* We make a copy of the object and pass the address to the | |
1055 | function being called. */ | |
1056 | rtx copy; | |
1057 | ||
d0f062fb | 1058 | if (!COMPLETE_TYPE_P (type) |
d7cdf113 JL |
1059 | || TREE_CODE (TYPE_SIZE (type)) != INTEGER_CST |
1060 | || (flag_stack_check && ! STACK_CHECK_BUILTIN | |
05bccae2 RK |
1061 | && (0 < compare_tree_int (TYPE_SIZE_UNIT (type), |
1062 | STACK_CHECK_MAX_VAR_SIZE)))) | |
d7cdf113 JL |
1063 | { |
1064 | /* This is a variable-sized object. Make space on the stack | |
1065 | for it. */ | |
078a18a4 | 1066 | rtx size_rtx = expr_size (args[i].tree_value); |
d7cdf113 JL |
1067 | |
1068 | if (*old_stack_level == 0) | |
1069 | { | |
1070 | emit_stack_save (SAVE_BLOCK, old_stack_level, NULL_RTX); | |
1071 | *old_pending_adj = pending_stack_adjust; | |
1072 | pending_stack_adjust = 0; | |
1073 | } | |
1074 | ||
1075 | copy = gen_rtx_MEM (BLKmode, | |
3bdf5ad1 RK |
1076 | allocate_dynamic_stack_space |
1077 | (size_rtx, NULL_RTX, TYPE_ALIGN (type))); | |
1078 | set_mem_attributes (copy, type, 1); | |
d7cdf113 JL |
1079 | } |
1080 | else | |
3bdf5ad1 | 1081 | copy = assign_temp (type, 0, 1, 0); |
d7cdf113 JL |
1082 | |
1083 | store_expr (args[i].tree_value, copy, 0); | |
d7cdf113 | 1084 | |
9969aaf6 RH |
1085 | if (callee_copies) |
1086 | *ecf_flags &= ~(ECF_CONST | ECF_LIBCALL_BLOCK); | |
1087 | else | |
1088 | *ecf_flags &= ~(ECF_CONST | ECF_PURE | ECF_LIBCALL_BLOCK); | |
1089 | ||
1090 | args[i].tree_value | |
1091 | = build_fold_addr_expr (make_tree (type, copy)); | |
1092 | type = TREE_TYPE (args[i].tree_value); | |
6de9cd9a | 1093 | *may_tailcall = false; |
d7cdf113 JL |
1094 | } |
1095 | } | |
1096 | ||
1097 | mode = TYPE_MODE (type); | |
8df83eae | 1098 | unsignedp = TYPE_UNSIGNED (type); |
d7cdf113 | 1099 | |
61f71b34 DD |
1100 | if (targetm.calls.promote_function_args (fndecl ? TREE_TYPE (fndecl) : 0)) |
1101 | mode = promote_mode (type, mode, &unsignedp, 1); | |
d7cdf113 JL |
1102 | |
1103 | args[i].unsignedp = unsignedp; | |
1104 | args[i].mode = mode; | |
7d167afd | 1105 | |
099e9712 JH |
1106 | args[i].reg = FUNCTION_ARG (*args_so_far, mode, type, |
1107 | argpos < n_named_args); | |
7d167afd JJ |
1108 | #ifdef FUNCTION_INCOMING_ARG |
1109 | /* If this is a sibling call and the machine has register windows, the | |
1110 | register window has to be unwinded before calling the routine, so | |
1111 | arguments have to go into the incoming registers. */ | |
099e9712 | 1112 | args[i].tail_call_reg = FUNCTION_INCOMING_ARG (*args_so_far, mode, type, |
f725a3ec | 1113 | argpos < n_named_args); |
099e9712 JH |
1114 | #else |
1115 | args[i].tail_call_reg = args[i].reg; | |
7d167afd | 1116 | #endif |
7d167afd | 1117 | |
d7cdf113 JL |
1118 | if (args[i].reg) |
1119 | args[i].partial | |
78a52f11 RH |
1120 | = targetm.calls.arg_partial_bytes (args_so_far, mode, type, |
1121 | argpos < n_named_args); | |
d7cdf113 | 1122 | |
fe984136 | 1123 | args[i].pass_on_stack = targetm.calls.must_pass_in_stack (mode, type); |
d7cdf113 JL |
1124 | |
1125 | /* If FUNCTION_ARG returned a (parallel [(expr_list (nil) ...) ...]), | |
1126 | it means that we are to pass this arg in the register(s) designated | |
1127 | by the PARALLEL, but also to pass it in the stack. */ | |
1128 | if (args[i].reg && GET_CODE (args[i].reg) == PARALLEL | |
1129 | && XEXP (XVECEXP (args[i].reg, 0, 0), 0) == 0) | |
1130 | args[i].pass_on_stack = 1; | |
1131 | ||
1132 | /* If this is an addressable type, we must preallocate the stack | |
1133 | since we must evaluate the object into its final location. | |
1134 | ||
1135 | If this is to be passed in both registers and the stack, it is simpler | |
1136 | to preallocate. */ | |
1137 | if (TREE_ADDRESSABLE (type) | |
1138 | || (args[i].pass_on_stack && args[i].reg != 0)) | |
1139 | *must_preallocate = 1; | |
1140 | ||
1141 | /* If this is an addressable type, we cannot pre-evaluate it. Thus, | |
1142 | we cannot consider this function call constant. */ | |
1143 | if (TREE_ADDRESSABLE (type)) | |
53d4257f | 1144 | *ecf_flags &= ~ECF_LIBCALL_BLOCK; |
d7cdf113 JL |
1145 | |
1146 | /* Compute the stack-size of this argument. */ | |
1147 | if (args[i].reg == 0 || args[i].partial != 0 | |
1148 | || reg_parm_stack_space > 0 | |
1149 | || args[i].pass_on_stack) | |
1150 | locate_and_pad_parm (mode, type, | |
1151 | #ifdef STACK_PARMS_IN_REG_PARM_AREA | |
1152 | 1, | |
1153 | #else | |
1154 | args[i].reg != 0, | |
1155 | #endif | |
e7949876 AM |
1156 | args[i].pass_on_stack ? 0 : args[i].partial, |
1157 | fndecl, args_size, &args[i].locate); | |
648bb159 RS |
1158 | #ifdef BLOCK_REG_PADDING |
1159 | else | |
1160 | /* The argument is passed entirely in registers. See at which | |
1161 | end it should be padded. */ | |
1162 | args[i].locate.where_pad = | |
1163 | BLOCK_REG_PADDING (mode, type, | |
1164 | int_size_in_bytes (type) <= UNITS_PER_WORD); | |
1165 | #endif | |
f725a3ec | 1166 | |
d7cdf113 JL |
1167 | /* Update ARGS_SIZE, the total stack space for args so far. */ |
1168 | ||
e7949876 AM |
1169 | args_size->constant += args[i].locate.size.constant; |
1170 | if (args[i].locate.size.var) | |
1171 | ADD_PARM_SIZE (*args_size, args[i].locate.size.var); | |
d7cdf113 JL |
1172 | |
1173 | /* Increment ARGS_SO_FAR, which has info about which arg-registers | |
1174 | have been used, etc. */ | |
1175 | ||
959f3a06 | 1176 | FUNCTION_ARG_ADVANCE (*args_so_far, TYPE_MODE (type), type, |
d7cdf113 JL |
1177 | argpos < n_named_args); |
1178 | } | |
1179 | } | |
1180 | ||
599f37b6 JL |
1181 | /* Update ARGS_SIZE to contain the total size for the argument block. |
1182 | Return the original constant component of the argument block's size. | |
1183 | ||
1184 | REG_PARM_STACK_SPACE holds the number of bytes of stack space reserved | |
1185 | for arguments passed in registers. */ | |
1186 | ||
1187 | static int | |
d329e058 AJ |
1188 | compute_argument_block_size (int reg_parm_stack_space, |
1189 | struct args_size *args_size, | |
1190 | int preferred_stack_boundary ATTRIBUTE_UNUSED) | |
599f37b6 JL |
1191 | { |
1192 | int unadjusted_args_size = args_size->constant; | |
1193 | ||
f73ad30e JH |
1194 | /* For accumulate outgoing args mode we don't need to align, since the frame |
1195 | will be already aligned. Align to STACK_BOUNDARY in order to prevent | |
f5143c46 | 1196 | backends from generating misaligned frame sizes. */ |
f73ad30e JH |
1197 | if (ACCUMULATE_OUTGOING_ARGS && preferred_stack_boundary > STACK_BOUNDARY) |
1198 | preferred_stack_boundary = STACK_BOUNDARY; | |
f73ad30e | 1199 | |
599f37b6 JL |
1200 | /* Compute the actual size of the argument block required. The variable |
1201 | and constant sizes must be combined, the size may have to be rounded, | |
1202 | and there may be a minimum required size. */ | |
1203 | ||
1204 | if (args_size->var) | |
1205 | { | |
1206 | args_size->var = ARGS_SIZE_TREE (*args_size); | |
1207 | args_size->constant = 0; | |
1208 | ||
c2f8b491 JH |
1209 | preferred_stack_boundary /= BITS_PER_UNIT; |
1210 | if (preferred_stack_boundary > 1) | |
1503a7ec JH |
1211 | { |
1212 | /* We don't handle this case yet. To handle it correctly we have | |
f5143c46 | 1213 | to add the delta, round and subtract the delta. |
1503a7ec | 1214 | Currently no machine description requires this support. */ |
366de0ce | 1215 | gcc_assert (!(stack_pointer_delta & (preferred_stack_boundary - 1))); |
1503a7ec JH |
1216 | args_size->var = round_up (args_size->var, preferred_stack_boundary); |
1217 | } | |
599f37b6 JL |
1218 | |
1219 | if (reg_parm_stack_space > 0) | |
1220 | { | |
1221 | args_size->var | |
1222 | = size_binop (MAX_EXPR, args_size->var, | |
fed3cef0 | 1223 | ssize_int (reg_parm_stack_space)); |
599f37b6 JL |
1224 | |
1225 | #ifndef OUTGOING_REG_PARM_STACK_SPACE | |
1226 | /* The area corresponding to register parameters is not to count in | |
1227 | the size of the block we need. So make the adjustment. */ | |
1228 | args_size->var | |
1229 | = size_binop (MINUS_EXPR, args_size->var, | |
fed3cef0 | 1230 | ssize_int (reg_parm_stack_space)); |
599f37b6 JL |
1231 | #endif |
1232 | } | |
1233 | } | |
1234 | else | |
1235 | { | |
c2f8b491 | 1236 | preferred_stack_boundary /= BITS_PER_UNIT; |
0a1c58a2 JL |
1237 | if (preferred_stack_boundary < 1) |
1238 | preferred_stack_boundary = 1; | |
fb5eebb9 | 1239 | args_size->constant = (((args_size->constant |
1503a7ec | 1240 | + stack_pointer_delta |
c2f8b491 JH |
1241 | + preferred_stack_boundary - 1) |
1242 | / preferred_stack_boundary | |
1243 | * preferred_stack_boundary) | |
1503a7ec | 1244 | - stack_pointer_delta); |
599f37b6 JL |
1245 | |
1246 | args_size->constant = MAX (args_size->constant, | |
1247 | reg_parm_stack_space); | |
1248 | ||
599f37b6 JL |
1249 | #ifndef OUTGOING_REG_PARM_STACK_SPACE |
1250 | args_size->constant -= reg_parm_stack_space; | |
1251 | #endif | |
1252 | } | |
1253 | return unadjusted_args_size; | |
1254 | } | |
1255 | ||
19832c77 | 1256 | /* Precompute parameters as needed for a function call. |
cc0b1adc | 1257 | |
f2d33f13 | 1258 | FLAGS is mask of ECF_* constants. |
cc0b1adc | 1259 | |
cc0b1adc JL |
1260 | NUM_ACTUALS is the number of arguments. |
1261 | ||
f725a3ec KH |
1262 | ARGS is an array containing information for each argument; this |
1263 | routine fills in the INITIAL_VALUE and VALUE fields for each | |
1264 | precomputed argument. */ | |
cc0b1adc JL |
1265 | |
1266 | static void | |
d329e058 | 1267 | precompute_arguments (int flags, int num_actuals, struct arg_data *args) |
cc0b1adc JL |
1268 | { |
1269 | int i; | |
1270 | ||
3638733b | 1271 | /* If this is a libcall, then precompute all arguments so that we do not |
82c82743 RH |
1272 | get extraneous instructions emitted as part of the libcall sequence. */ |
1273 | if ((flags & ECF_LIBCALL_BLOCK) == 0) | |
1274 | return; | |
7ae4ad28 | 1275 | |
cc0b1adc | 1276 | for (i = 0; i < num_actuals; i++) |
82c82743 RH |
1277 | { |
1278 | enum machine_mode mode; | |
ddef6bc7 | 1279 | |
82c82743 | 1280 | /* If this is an addressable type, we cannot pre-evaluate it. */ |
366de0ce | 1281 | gcc_assert (!TREE_ADDRESSABLE (TREE_TYPE (args[i].tree_value))); |
cc0b1adc | 1282 | |
82c82743 | 1283 | args[i].initial_value = args[i].value |
84217346 | 1284 | = expand_normal (args[i].tree_value); |
cc0b1adc | 1285 | |
82c82743 RH |
1286 | mode = TYPE_MODE (TREE_TYPE (args[i].tree_value)); |
1287 | if (mode != args[i].mode) | |
1288 | { | |
1289 | args[i].value | |
1290 | = convert_modes (args[i].mode, mode, | |
1291 | args[i].value, args[i].unsignedp); | |
9e1622ed | 1292 | #if defined(PROMOTE_FUNCTION_MODE) && !defined(PROMOTE_MODE) |
82c82743 RH |
1293 | /* CSE will replace this only if it contains args[i].value |
1294 | pseudo, so convert it down to the declared mode using | |
1295 | a SUBREG. */ | |
1296 | if (REG_P (args[i].value) | |
1297 | && GET_MODE_CLASS (args[i].mode) == MODE_INT) | |
1298 | { | |
1299 | args[i].initial_value | |
1300 | = gen_lowpart_SUBREG (mode, args[i].value); | |
1301 | SUBREG_PROMOTED_VAR_P (args[i].initial_value) = 1; | |
1302 | SUBREG_PROMOTED_UNSIGNED_SET (args[i].initial_value, | |
1303 | args[i].unsignedp); | |
1304 | } | |
47841d1b | 1305 | #endif |
82c82743 RH |
1306 | } |
1307 | } | |
cc0b1adc JL |
1308 | } |
1309 | ||
0f9b3ea6 JL |
1310 | /* Given the current state of MUST_PREALLOCATE and information about |
1311 | arguments to a function call in NUM_ACTUALS, ARGS and ARGS_SIZE, | |
1312 | compute and return the final value for MUST_PREALLOCATE. */ | |
1313 | ||
1314 | static int | |
5039610b SL |
1315 | finalize_must_preallocate (int must_preallocate, int num_actuals, |
1316 | struct arg_data *args, struct args_size *args_size) | |
0f9b3ea6 JL |
1317 | { |
1318 | /* See if we have or want to preallocate stack space. | |
1319 | ||
1320 | If we would have to push a partially-in-regs parm | |
1321 | before other stack parms, preallocate stack space instead. | |
1322 | ||
1323 | If the size of some parm is not a multiple of the required stack | |
1324 | alignment, we must preallocate. | |
1325 | ||
1326 | If the total size of arguments that would otherwise create a copy in | |
1327 | a temporary (such as a CALL) is more than half the total argument list | |
1328 | size, preallocation is faster. | |
1329 | ||
1330 | Another reason to preallocate is if we have a machine (like the m88k) | |
1331 | where stack alignment is required to be maintained between every | |
1332 | pair of insns, not just when the call is made. However, we assume here | |
1333 | that such machines either do not have push insns (and hence preallocation | |
1334 | would occur anyway) or the problem is taken care of with | |
1335 | PUSH_ROUNDING. */ | |
1336 | ||
1337 | if (! must_preallocate) | |
1338 | { | |
1339 | int partial_seen = 0; | |
1340 | int copy_to_evaluate_size = 0; | |
1341 | int i; | |
1342 | ||
1343 | for (i = 0; i < num_actuals && ! must_preallocate; i++) | |
1344 | { | |
1345 | if (args[i].partial > 0 && ! args[i].pass_on_stack) | |
1346 | partial_seen = 1; | |
1347 | else if (partial_seen && args[i].reg == 0) | |
1348 | must_preallocate = 1; | |
1349 | ||
1350 | if (TYPE_MODE (TREE_TYPE (args[i].tree_value)) == BLKmode | |
1351 | && (TREE_CODE (args[i].tree_value) == CALL_EXPR | |
1352 | || TREE_CODE (args[i].tree_value) == TARGET_EXPR | |
1353 | || TREE_CODE (args[i].tree_value) == COND_EXPR | |
1354 | || TREE_ADDRESSABLE (TREE_TYPE (args[i].tree_value)))) | |
1355 | copy_to_evaluate_size | |
1356 | += int_size_in_bytes (TREE_TYPE (args[i].tree_value)); | |
1357 | } | |
1358 | ||
1359 | if (copy_to_evaluate_size * 2 >= args_size->constant | |
1360 | && args_size->constant > 0) | |
1361 | must_preallocate = 1; | |
1362 | } | |
1363 | return must_preallocate; | |
1364 | } | |
599f37b6 | 1365 | |
a45bdd02 JL |
1366 | /* If we preallocated stack space, compute the address of each argument |
1367 | and store it into the ARGS array. | |
1368 | ||
f725a3ec | 1369 | We need not ensure it is a valid memory address here; it will be |
a45bdd02 JL |
1370 | validized when it is used. |
1371 | ||
1372 | ARGBLOCK is an rtx for the address of the outgoing arguments. */ | |
1373 | ||
1374 | static void | |
d329e058 | 1375 | compute_argument_addresses (struct arg_data *args, rtx argblock, int num_actuals) |
a45bdd02 JL |
1376 | { |
1377 | if (argblock) | |
1378 | { | |
1379 | rtx arg_reg = argblock; | |
1380 | int i, arg_offset = 0; | |
1381 | ||
1382 | if (GET_CODE (argblock) == PLUS) | |
1383 | arg_reg = XEXP (argblock, 0), arg_offset = INTVAL (XEXP (argblock, 1)); | |
1384 | ||
1385 | for (i = 0; i < num_actuals; i++) | |
1386 | { | |
e7949876 AM |
1387 | rtx offset = ARGS_SIZE_RTX (args[i].locate.offset); |
1388 | rtx slot_offset = ARGS_SIZE_RTX (args[i].locate.slot_offset); | |
a45bdd02 | 1389 | rtx addr; |
bfc45551 | 1390 | unsigned int align, boundary; |
7816b87e JC |
1391 | unsigned int units_on_stack = 0; |
1392 | enum machine_mode partial_mode = VOIDmode; | |
a45bdd02 JL |
1393 | |
1394 | /* Skip this parm if it will not be passed on the stack. */ | |
7816b87e JC |
1395 | if (! args[i].pass_on_stack |
1396 | && args[i].reg != 0 | |
1397 | && args[i].partial == 0) | |
a45bdd02 JL |
1398 | continue; |
1399 | ||
1400 | if (GET_CODE (offset) == CONST_INT) | |
1401 | addr = plus_constant (arg_reg, INTVAL (offset)); | |
1402 | else | |
1403 | addr = gen_rtx_PLUS (Pmode, arg_reg, offset); | |
1404 | ||
1405 | addr = plus_constant (addr, arg_offset); | |
7816b87e JC |
1406 | |
1407 | if (args[i].partial != 0) | |
1408 | { | |
1409 | /* Only part of the parameter is being passed on the stack. | |
1410 | Generate a simple memory reference of the correct size. */ | |
1411 | units_on_stack = args[i].locate.size.constant; | |
1412 | partial_mode = mode_for_size (units_on_stack * BITS_PER_UNIT, | |
1413 | MODE_INT, 1); | |
1414 | args[i].stack = gen_rtx_MEM (partial_mode, addr); | |
1415 | set_mem_size (args[i].stack, GEN_INT (units_on_stack)); | |
1416 | } | |
1417 | else | |
1418 | { | |
1419 | args[i].stack = gen_rtx_MEM (args[i].mode, addr); | |
1420 | set_mem_attributes (args[i].stack, | |
1421 | TREE_TYPE (args[i].tree_value), 1); | |
1422 | } | |
bfc45551 AM |
1423 | align = BITS_PER_UNIT; |
1424 | boundary = args[i].locate.boundary; | |
1425 | if (args[i].locate.where_pad != downward) | |
1426 | align = boundary; | |
1427 | else if (GET_CODE (offset) == CONST_INT) | |
1428 | { | |
1429 | align = INTVAL (offset) * BITS_PER_UNIT | boundary; | |
1430 | align = align & -align; | |
1431 | } | |
1432 | set_mem_align (args[i].stack, align); | |
a45bdd02 JL |
1433 | |
1434 | if (GET_CODE (slot_offset) == CONST_INT) | |
1435 | addr = plus_constant (arg_reg, INTVAL (slot_offset)); | |
1436 | else | |
1437 | addr = gen_rtx_PLUS (Pmode, arg_reg, slot_offset); | |
1438 | ||
1439 | addr = plus_constant (addr, arg_offset); | |
7816b87e JC |
1440 | |
1441 | if (args[i].partial != 0) | |
1442 | { | |
1443 | /* Only part of the parameter is being passed on the stack. | |
1444 | Generate a simple memory reference of the correct size. | |
1445 | */ | |
1446 | args[i].stack_slot = gen_rtx_MEM (partial_mode, addr); | |
1447 | set_mem_size (args[i].stack_slot, GEN_INT (units_on_stack)); | |
1448 | } | |
1449 | else | |
1450 | { | |
1451 | args[i].stack_slot = gen_rtx_MEM (args[i].mode, addr); | |
1452 | set_mem_attributes (args[i].stack_slot, | |
1453 | TREE_TYPE (args[i].tree_value), 1); | |
1454 | } | |
bfc45551 | 1455 | set_mem_align (args[i].stack_slot, args[i].locate.boundary); |
7ab923cc JJ |
1456 | |
1457 | /* Function incoming arguments may overlap with sibling call | |
1458 | outgoing arguments and we cannot allow reordering of reads | |
1459 | from function arguments with stores to outgoing arguments | |
1460 | of sibling calls. */ | |
ba4828e0 RK |
1461 | set_mem_alias_set (args[i].stack, 0); |
1462 | set_mem_alias_set (args[i].stack_slot, 0); | |
a45bdd02 JL |
1463 | } |
1464 | } | |
1465 | } | |
f725a3ec | 1466 | |
a45bdd02 JL |
1467 | /* Given a FNDECL and EXP, return an rtx suitable for use as a target address |
1468 | in a call instruction. | |
1469 | ||
1470 | FNDECL is the tree node for the target function. For an indirect call | |
1471 | FNDECL will be NULL_TREE. | |
1472 | ||
09e2bf48 | 1473 | ADDR is the operand 0 of CALL_EXPR for this call. */ |
a45bdd02 JL |
1474 | |
1475 | static rtx | |
d329e058 | 1476 | rtx_for_function_call (tree fndecl, tree addr) |
a45bdd02 JL |
1477 | { |
1478 | rtx funexp; | |
1479 | ||
1480 | /* Get the function to call, in the form of RTL. */ | |
1481 | if (fndecl) | |
1482 | { | |
1483 | /* If this is the first use of the function, see if we need to | |
1484 | make an external definition for it. */ | |
1485 | if (! TREE_USED (fndecl)) | |
1486 | { | |
1487 | assemble_external (fndecl); | |
1488 | TREE_USED (fndecl) = 1; | |
1489 | } | |
1490 | ||
1491 | /* Get a SYMBOL_REF rtx for the function address. */ | |
1492 | funexp = XEXP (DECL_RTL (fndecl), 0); | |
1493 | } | |
1494 | else | |
1495 | /* Generate an rtx (probably a pseudo-register) for the address. */ | |
1496 | { | |
1497 | push_temp_slots (); | |
84217346 | 1498 | funexp = expand_normal (addr); |
f725a3ec | 1499 | pop_temp_slots (); /* FUNEXP can't be BLKmode. */ |
a45bdd02 JL |
1500 | } |
1501 | return funexp; | |
1502 | } | |
1503 | ||
07eef816 KH |
1504 | /* Return true if and only if SIZE storage units (usually bytes) |
1505 | starting from address ADDR overlap with already clobbered argument | |
1506 | area. This function is used to determine if we should give up a | |
1507 | sibcall. */ | |
1508 | ||
1509 | static bool | |
1510 | mem_overlaps_already_clobbered_arg_p (rtx addr, unsigned HOST_WIDE_INT size) | |
1511 | { | |
1512 | HOST_WIDE_INT i; | |
1513 | ||
1514 | if (addr == current_function_internal_arg_pointer) | |
1515 | i = 0; | |
1516 | else if (GET_CODE (addr) == PLUS | |
ae22dcff | 1517 | && XEXP (addr, 0) == current_function_internal_arg_pointer |
07eef816 KH |
1518 | && GET_CODE (XEXP (addr, 1)) == CONST_INT) |
1519 | i = INTVAL (XEXP (addr, 1)); | |
ae22dcff EB |
1520 | /* Return true for arg pointer based indexed addressing. */ |
1521 | else if (GET_CODE (addr) == PLUS | |
1522 | && (XEXP (addr, 0) == current_function_internal_arg_pointer | |
1523 | || XEXP (addr, 1) == current_function_internal_arg_pointer)) | |
1524 | return true; | |
07eef816 KH |
1525 | else |
1526 | return false; | |
1527 | ||
1528 | #ifdef ARGS_GROW_DOWNWARD | |
1529 | i = -i - size; | |
1530 | #endif | |
1531 | if (size > 0) | |
1532 | { | |
1533 | unsigned HOST_WIDE_INT k; | |
1534 | ||
1535 | for (k = 0; k < size; k++) | |
1536 | if (i + k < stored_args_map->n_bits | |
1537 | && TEST_BIT (stored_args_map, i + k)) | |
1538 | return true; | |
1539 | } | |
1540 | ||
1541 | return false; | |
1542 | } | |
1543 | ||
21a3b983 JL |
1544 | /* Do the register loads required for any wholly-register parms or any |
1545 | parms which are passed both on the stack and in a register. Their | |
f725a3ec | 1546 | expressions were already evaluated. |
21a3b983 JL |
1547 | |
1548 | Mark all register-parms as living through the call, putting these USE | |
d329e058 AJ |
1549 | insns in the CALL_INSN_FUNCTION_USAGE field. |
1550 | ||
40b0345d | 1551 | When IS_SIBCALL, perform the check_sibcall_argument_overlap |
0cdca92b | 1552 | checking, setting *SIBCALL_FAILURE if appropriate. */ |
21a3b983 JL |
1553 | |
1554 | static void | |
d329e058 AJ |
1555 | load_register_parameters (struct arg_data *args, int num_actuals, |
1556 | rtx *call_fusage, int flags, int is_sibcall, | |
1557 | int *sibcall_failure) | |
21a3b983 JL |
1558 | { |
1559 | int i, j; | |
1560 | ||
21a3b983 | 1561 | for (i = 0; i < num_actuals; i++) |
21a3b983 | 1562 | { |
099e9712 JH |
1563 | rtx reg = ((flags & ECF_SIBCALL) |
1564 | ? args[i].tail_call_reg : args[i].reg); | |
21a3b983 JL |
1565 | if (reg) |
1566 | { | |
6e985040 AM |
1567 | int partial = args[i].partial; |
1568 | int nregs; | |
1569 | int size = 0; | |
0cdca92b | 1570 | rtx before_arg = get_last_insn (); |
f0078f86 AM |
1571 | /* Set non-negative if we must move a word at a time, even if |
1572 | just one word (e.g, partial == 4 && mode == DFmode). Set | |
1573 | to -1 if we just use a normal move insn. This value can be | |
1574 | zero if the argument is a zero size structure. */ | |
6e985040 | 1575 | nregs = -1; |
78a52f11 RH |
1576 | if (GET_CODE (reg) == PARALLEL) |
1577 | ; | |
1578 | else if (partial) | |
1579 | { | |
1580 | gcc_assert (partial % UNITS_PER_WORD == 0); | |
1581 | nregs = partial / UNITS_PER_WORD; | |
1582 | } | |
6e985040 AM |
1583 | else if (TYPE_MODE (TREE_TYPE (args[i].tree_value)) == BLKmode) |
1584 | { | |
1585 | size = int_size_in_bytes (TREE_TYPE (args[i].tree_value)); | |
1586 | nregs = (size + (UNITS_PER_WORD - 1)) / UNITS_PER_WORD; | |
1587 | } | |
1588 | else | |
1589 | size = GET_MODE_SIZE (args[i].mode); | |
21a3b983 JL |
1590 | |
1591 | /* Handle calls that pass values in multiple non-contiguous | |
1592 | locations. The Irix 6 ABI has examples of this. */ | |
1593 | ||
1594 | if (GET_CODE (reg) == PARALLEL) | |
8df3dbb7 | 1595 | emit_group_move (reg, args[i].parallel_value); |
21a3b983 JL |
1596 | |
1597 | /* If simple case, just do move. If normal partial, store_one_arg | |
1598 | has already loaded the register for us. In all other cases, | |
1599 | load the register(s) from memory. */ | |
1600 | ||
9206d736 AM |
1601 | else if (nregs == -1) |
1602 | { | |
1603 | emit_move_insn (reg, args[i].value); | |
6e985040 | 1604 | #ifdef BLOCK_REG_PADDING |
9206d736 AM |
1605 | /* Handle case where we have a value that needs shifting |
1606 | up to the msb. eg. a QImode value and we're padding | |
1607 | upward on a BYTES_BIG_ENDIAN machine. */ | |
1608 | if (size < UNITS_PER_WORD | |
1609 | && (args[i].locate.where_pad | |
1610 | == (BYTES_BIG_ENDIAN ? upward : downward))) | |
1611 | { | |
9206d736 AM |
1612 | rtx x; |
1613 | int shift = (UNITS_PER_WORD - size) * BITS_PER_UNIT; | |
980f6e8e AM |
1614 | |
1615 | /* Assigning REG here rather than a temp makes CALL_FUSAGE | |
1616 | report the whole reg as used. Strictly speaking, the | |
1617 | call only uses SIZE bytes at the msb end, but it doesn't | |
1618 | seem worth generating rtl to say that. */ | |
1619 | reg = gen_rtx_REG (word_mode, REGNO (reg)); | |
09b52670 | 1620 | x = expand_shift (LSHIFT_EXPR, word_mode, reg, |
7d60be94 | 1621 | build_int_cst (NULL_TREE, shift), |
4a90aeeb | 1622 | reg, 1); |
980f6e8e AM |
1623 | if (x != reg) |
1624 | emit_move_insn (reg, x); | |
9206d736 | 1625 | } |
6e985040 | 1626 | #endif |
9206d736 | 1627 | } |
21a3b983 JL |
1628 | |
1629 | /* If we have pre-computed the values to put in the registers in | |
1630 | the case of non-aligned structures, copy them in now. */ | |
1631 | ||
1632 | else if (args[i].n_aligned_regs != 0) | |
1633 | for (j = 0; j < args[i].n_aligned_regs; j++) | |
1634 | emit_move_insn (gen_rtx_REG (word_mode, REGNO (reg) + j), | |
1635 | args[i].aligned_regs[j]); | |
1636 | ||
1637 | else if (partial == 0 || args[i].pass_on_stack) | |
6e985040 AM |
1638 | { |
1639 | rtx mem = validize_mem (args[i].value); | |
1640 | ||
07eef816 KH |
1641 | /* Check for overlap with already clobbered argument area. */ |
1642 | if (is_sibcall | |
1643 | && mem_overlaps_already_clobbered_arg_p (XEXP (args[i].value, 0), | |
1644 | size)) | |
1645 | *sibcall_failure = 1; | |
1646 | ||
6e985040 | 1647 | /* Handle a BLKmode that needs shifting. */ |
9206d736 | 1648 | if (nregs == 1 && size < UNITS_PER_WORD |
03ca1672 UW |
1649 | #ifdef BLOCK_REG_PADDING |
1650 | && args[i].locate.where_pad == downward | |
1651 | #else | |
1652 | && BYTES_BIG_ENDIAN | |
1653 | #endif | |
1654 | ) | |
6e985040 AM |
1655 | { |
1656 | rtx tem = operand_subword_force (mem, 0, args[i].mode); | |
1657 | rtx ri = gen_rtx_REG (word_mode, REGNO (reg)); | |
1658 | rtx x = gen_reg_rtx (word_mode); | |
1659 | int shift = (UNITS_PER_WORD - size) * BITS_PER_UNIT; | |
09b52670 RS |
1660 | enum tree_code dir = BYTES_BIG_ENDIAN ? RSHIFT_EXPR |
1661 | : LSHIFT_EXPR; | |
6e985040 AM |
1662 | |
1663 | emit_move_insn (x, tem); | |
09b52670 | 1664 | x = expand_shift (dir, word_mode, x, |
7d60be94 | 1665 | build_int_cst (NULL_TREE, shift), |
4a90aeeb | 1666 | ri, 1); |
6e985040 AM |
1667 | if (x != ri) |
1668 | emit_move_insn (ri, x); | |
1669 | } | |
1670 | else | |
6e985040 AM |
1671 | move_block_to_reg (REGNO (reg), mem, nregs, args[i].mode); |
1672 | } | |
21a3b983 | 1673 | |
0cdca92b DJ |
1674 | /* When a parameter is a block, and perhaps in other cases, it is |
1675 | possible that it did a load from an argument slot that was | |
32dd366d | 1676 | already clobbered. */ |
0cdca92b DJ |
1677 | if (is_sibcall |
1678 | && check_sibcall_argument_overlap (before_arg, &args[i], 0)) | |
1679 | *sibcall_failure = 1; | |
1680 | ||
21a3b983 JL |
1681 | /* Handle calls that pass values in multiple non-contiguous |
1682 | locations. The Irix 6 ABI has examples of this. */ | |
1683 | if (GET_CODE (reg) == PARALLEL) | |
1684 | use_group_regs (call_fusage, reg); | |
1685 | else if (nregs == -1) | |
1686 | use_reg (call_fusage, reg); | |
faa00334 AO |
1687 | else if (nregs > 0) |
1688 | use_regs (call_fusage, REGNO (reg), nregs); | |
21a3b983 JL |
1689 | } |
1690 | } | |
1691 | } | |
1692 | ||
739fb049 MM |
1693 | /* We need to pop PENDING_STACK_ADJUST bytes. But, if the arguments |
1694 | wouldn't fill up an even multiple of PREFERRED_UNIT_STACK_BOUNDARY | |
1695 | bytes, then we would need to push some additional bytes to pad the | |
ce48579b RH |
1696 | arguments. So, we compute an adjust to the stack pointer for an |
1697 | amount that will leave the stack under-aligned by UNADJUSTED_ARGS_SIZE | |
1698 | bytes. Then, when the arguments are pushed the stack will be perfectly | |
1699 | aligned. ARGS_SIZE->CONSTANT is set to the number of bytes that should | |
1700 | be popped after the call. Returns the adjustment. */ | |
739fb049 | 1701 | |
ce48579b | 1702 | static int |
d329e058 AJ |
1703 | combine_pending_stack_adjustment_and_call (int unadjusted_args_size, |
1704 | struct args_size *args_size, | |
95899b34 | 1705 | unsigned int preferred_unit_stack_boundary) |
739fb049 MM |
1706 | { |
1707 | /* The number of bytes to pop so that the stack will be | |
1708 | under-aligned by UNADJUSTED_ARGS_SIZE bytes. */ | |
1709 | HOST_WIDE_INT adjustment; | |
1710 | /* The alignment of the stack after the arguments are pushed, if we | |
1711 | just pushed the arguments without adjust the stack here. */ | |
95899b34 | 1712 | unsigned HOST_WIDE_INT unadjusted_alignment; |
739fb049 | 1713 | |
f725a3ec | 1714 | unadjusted_alignment |
739fb049 MM |
1715 | = ((stack_pointer_delta + unadjusted_args_size) |
1716 | % preferred_unit_stack_boundary); | |
1717 | ||
1718 | /* We want to get rid of as many of the PENDING_STACK_ADJUST bytes | |
1719 | as possible -- leaving just enough left to cancel out the | |
1720 | UNADJUSTED_ALIGNMENT. In other words, we want to ensure that the | |
1721 | PENDING_STACK_ADJUST is non-negative, and congruent to | |
1722 | -UNADJUSTED_ALIGNMENT modulo the PREFERRED_UNIT_STACK_BOUNDARY. */ | |
1723 | ||
1724 | /* Begin by trying to pop all the bytes. */ | |
f725a3ec KH |
1725 | unadjusted_alignment |
1726 | = (unadjusted_alignment | |
739fb049 MM |
1727 | - (pending_stack_adjust % preferred_unit_stack_boundary)); |
1728 | adjustment = pending_stack_adjust; | |
1729 | /* Push enough additional bytes that the stack will be aligned | |
1730 | after the arguments are pushed. */ | |
e079dcdb HB |
1731 | if (preferred_unit_stack_boundary > 1) |
1732 | { | |
3e555c7d | 1733 | if (unadjusted_alignment > 0) |
f725a3ec | 1734 | adjustment -= preferred_unit_stack_boundary - unadjusted_alignment; |
e079dcdb | 1735 | else |
f725a3ec | 1736 | adjustment += unadjusted_alignment; |
e079dcdb | 1737 | } |
f725a3ec | 1738 | |
739fb049 MM |
1739 | /* Now, sets ARGS_SIZE->CONSTANT so that we pop the right number of |
1740 | bytes after the call. The right number is the entire | |
1741 | PENDING_STACK_ADJUST less our ADJUSTMENT plus the amount required | |
1742 | by the arguments in the first place. */ | |
f725a3ec | 1743 | args_size->constant |
739fb049 MM |
1744 | = pending_stack_adjust - adjustment + unadjusted_args_size; |
1745 | ||
ce48579b | 1746 | return adjustment; |
739fb049 MM |
1747 | } |
1748 | ||
c67846f2 JJ |
1749 | /* Scan X expression if it does not dereference any argument slots |
1750 | we already clobbered by tail call arguments (as noted in stored_args_map | |
1751 | bitmap). | |
da7d8304 | 1752 | Return nonzero if X expression dereferences such argument slots, |
c67846f2 JJ |
1753 | zero otherwise. */ |
1754 | ||
1755 | static int | |
d329e058 | 1756 | check_sibcall_argument_overlap_1 (rtx x) |
c67846f2 JJ |
1757 | { |
1758 | RTX_CODE code; | |
1759 | int i, j; | |
c67846f2 JJ |
1760 | const char *fmt; |
1761 | ||
1762 | if (x == NULL_RTX) | |
1763 | return 0; | |
1764 | ||
1765 | code = GET_CODE (x); | |
1766 | ||
1767 | if (code == MEM) | |
07eef816 KH |
1768 | return mem_overlaps_already_clobbered_arg_p (XEXP (x, 0), |
1769 | GET_MODE_SIZE (GET_MODE (x))); | |
c67846f2 | 1770 | |
f725a3ec | 1771 | /* Scan all subexpressions. */ |
c67846f2 JJ |
1772 | fmt = GET_RTX_FORMAT (code); |
1773 | for (i = 0; i < GET_RTX_LENGTH (code); i++, fmt++) | |
1774 | { | |
1775 | if (*fmt == 'e') | |
f725a3ec KH |
1776 | { |
1777 | if (check_sibcall_argument_overlap_1 (XEXP (x, i))) | |
1778 | return 1; | |
1779 | } | |
c67846f2 | 1780 | else if (*fmt == 'E') |
f725a3ec KH |
1781 | { |
1782 | for (j = 0; j < XVECLEN (x, i); j++) | |
1783 | if (check_sibcall_argument_overlap_1 (XVECEXP (x, i, j))) | |
1784 | return 1; | |
1785 | } | |
c67846f2 JJ |
1786 | } |
1787 | return 0; | |
c67846f2 JJ |
1788 | } |
1789 | ||
1790 | /* Scan sequence after INSN if it does not dereference any argument slots | |
1791 | we already clobbered by tail call arguments (as noted in stored_args_map | |
0cdca92b DJ |
1792 | bitmap). If MARK_STORED_ARGS_MAP, add stack slots for ARG to |
1793 | stored_args_map bitmap afterwards (when ARG is a register MARK_STORED_ARGS_MAP | |
1794 | should be 0). Return nonzero if sequence after INSN dereferences such argument | |
1795 | slots, zero otherwise. */ | |
c67846f2 JJ |
1796 | |
1797 | static int | |
d329e058 | 1798 | check_sibcall_argument_overlap (rtx insn, struct arg_data *arg, int mark_stored_args_map) |
f725a3ec | 1799 | { |
c67846f2 JJ |
1800 | int low, high; |
1801 | ||
1802 | if (insn == NULL_RTX) | |
1803 | insn = get_insns (); | |
1804 | else | |
1805 | insn = NEXT_INSN (insn); | |
1806 | ||
1807 | for (; insn; insn = NEXT_INSN (insn)) | |
f725a3ec KH |
1808 | if (INSN_P (insn) |
1809 | && check_sibcall_argument_overlap_1 (PATTERN (insn))) | |
c67846f2 JJ |
1810 | break; |
1811 | ||
0cdca92b DJ |
1812 | if (mark_stored_args_map) |
1813 | { | |
d60eab50 | 1814 | #ifdef ARGS_GROW_DOWNWARD |
e7949876 | 1815 | low = -arg->locate.slot_offset.constant - arg->locate.size.constant; |
d60eab50 | 1816 | #else |
e7949876 | 1817 | low = arg->locate.slot_offset.constant; |
d60eab50 AO |
1818 | #endif |
1819 | ||
e7949876 | 1820 | for (high = low + arg->locate.size.constant; low < high; low++) |
0cdca92b DJ |
1821 | SET_BIT (stored_args_map, low); |
1822 | } | |
c67846f2 JJ |
1823 | return insn != NULL_RTX; |
1824 | } | |
1825 | ||
bef5d8b6 RS |
1826 | /* Given that a function returns a value of mode MODE at the most |
1827 | significant end of hard register VALUE, shift VALUE left or right | |
1828 | as specified by LEFT_P. Return true if some action was needed. */ | |
c988af2b | 1829 | |
bef5d8b6 RS |
1830 | bool |
1831 | shift_return_value (enum machine_mode mode, bool left_p, rtx value) | |
c988af2b | 1832 | { |
bef5d8b6 RS |
1833 | HOST_WIDE_INT shift; |
1834 | ||
1835 | gcc_assert (REG_P (value) && HARD_REGISTER_P (value)); | |
1836 | shift = GET_MODE_BITSIZE (GET_MODE (value)) - GET_MODE_BITSIZE (mode); | |
1837 | if (shift == 0) | |
1838 | return false; | |
1839 | ||
1840 | /* Use ashr rather than lshr for right shifts. This is for the benefit | |
1841 | of the MIPS port, which requires SImode values to be sign-extended | |
1842 | when stored in 64-bit registers. */ | |
1843 | if (!force_expand_binop (GET_MODE (value), left_p ? ashl_optab : ashr_optab, | |
1844 | value, GEN_INT (shift), value, 1, OPTAB_WIDEN)) | |
1845 | gcc_unreachable (); | |
1846 | return true; | |
c988af2b RS |
1847 | } |
1848 | ||
5039610b | 1849 | /* Generate all the code for a CALL_EXPR exp |
51bbfa0c RS |
1850 | and return an rtx for its value. |
1851 | Store the value in TARGET (specified as an rtx) if convenient. | |
1852 | If the value is stored in TARGET then TARGET is returned. | |
1853 | If IGNORE is nonzero, then we ignore the value of the function call. */ | |
1854 | ||
1855 | rtx | |
d329e058 | 1856 | expand_call (tree exp, rtx target, int ignore) |
51bbfa0c | 1857 | { |
0a1c58a2 JL |
1858 | /* Nonzero if we are currently expanding a call. */ |
1859 | static int currently_expanding_call = 0; | |
1860 | ||
51bbfa0c RS |
1861 | /* RTX for the function to be called. */ |
1862 | rtx funexp; | |
0a1c58a2 JL |
1863 | /* Sequence of insns to perform a normal "call". */ |
1864 | rtx normal_call_insns = NULL_RTX; | |
6de9cd9a | 1865 | /* Sequence of insns to perform a tail "call". */ |
0a1c58a2 | 1866 | rtx tail_call_insns = NULL_RTX; |
51bbfa0c RS |
1867 | /* Data type of the function. */ |
1868 | tree funtype; | |
ded9bf77 | 1869 | tree type_arg_types; |
51bbfa0c RS |
1870 | /* Declaration of the function being called, |
1871 | or 0 if the function is computed (not known by name). */ | |
1872 | tree fndecl = 0; | |
57782ad8 MM |
1873 | /* The type of the function being called. */ |
1874 | tree fntype; | |
6de9cd9a | 1875 | bool try_tail_call = CALL_EXPR_TAILCALL (exp); |
0a1c58a2 | 1876 | int pass; |
51bbfa0c RS |
1877 | |
1878 | /* Register in which non-BLKmode value will be returned, | |
1879 | or 0 if no value or if value is BLKmode. */ | |
1880 | rtx valreg; | |
1881 | /* Address where we should return a BLKmode value; | |
1882 | 0 if value not BLKmode. */ | |
1883 | rtx structure_value_addr = 0; | |
1884 | /* Nonzero if that address is being passed by treating it as | |
1885 | an extra, implicit first parameter. Otherwise, | |
1886 | it is passed by being copied directly into struct_value_rtx. */ | |
1887 | int structure_value_addr_parm = 0; | |
078a18a4 SL |
1888 | /* Holds the value of implicit argument for the struct value. */ |
1889 | tree structure_value_addr_value = NULL_TREE; | |
51bbfa0c RS |
1890 | /* Size of aggregate value wanted, or zero if none wanted |
1891 | or if we are using the non-reentrant PCC calling convention | |
1892 | or expecting the value in registers. */ | |
e5e809f4 | 1893 | HOST_WIDE_INT struct_value_size = 0; |
51bbfa0c RS |
1894 | /* Nonzero if called function returns an aggregate in memory PCC style, |
1895 | by returning the address of where to find it. */ | |
1896 | int pcc_struct_value = 0; | |
61f71b34 | 1897 | rtx struct_value = 0; |
51bbfa0c RS |
1898 | |
1899 | /* Number of actual parameters in this call, including struct value addr. */ | |
1900 | int num_actuals; | |
1901 | /* Number of named args. Args after this are anonymous ones | |
1902 | and they must all go on the stack. */ | |
1903 | int n_named_args; | |
078a18a4 SL |
1904 | /* Number of complex actual arguments that need to be split. */ |
1905 | int num_complex_actuals = 0; | |
51bbfa0c RS |
1906 | |
1907 | /* Vector of information about each argument. | |
1908 | Arguments are numbered in the order they will be pushed, | |
1909 | not the order they are written. */ | |
1910 | struct arg_data *args; | |
1911 | ||
1912 | /* Total size in bytes of all the stack-parms scanned so far. */ | |
1913 | struct args_size args_size; | |
099e9712 | 1914 | struct args_size adjusted_args_size; |
51bbfa0c | 1915 | /* Size of arguments before any adjustments (such as rounding). */ |
599f37b6 | 1916 | int unadjusted_args_size; |
51bbfa0c RS |
1917 | /* Data on reg parms scanned so far. */ |
1918 | CUMULATIVE_ARGS args_so_far; | |
1919 | /* Nonzero if a reg parm has been scanned. */ | |
1920 | int reg_parm_seen; | |
efd65a8b | 1921 | /* Nonzero if this is an indirect function call. */ |
51bbfa0c | 1922 | |
f725a3ec | 1923 | /* Nonzero if we must avoid push-insns in the args for this call. |
51bbfa0c RS |
1924 | If stack space is allocated for register parameters, but not by the |
1925 | caller, then it is preallocated in the fixed part of the stack frame. | |
1926 | So the entire argument block must then be preallocated (i.e., we | |
1927 | ignore PUSH_ROUNDING in that case). */ | |
1928 | ||
f73ad30e | 1929 | int must_preallocate = !PUSH_ARGS; |
51bbfa0c | 1930 | |
f72aed24 | 1931 | /* Size of the stack reserved for parameter registers. */ |
6f90e075 JW |
1932 | int reg_parm_stack_space = 0; |
1933 | ||
51bbfa0c RS |
1934 | /* Address of space preallocated for stack parms |
1935 | (on machines that lack push insns), or 0 if space not preallocated. */ | |
1936 | rtx argblock = 0; | |
1937 | ||
f2d33f13 JH |
1938 | /* Mask of ECF_ flags. */ |
1939 | int flags = 0; | |
f73ad30e | 1940 | #ifdef REG_PARM_STACK_SPACE |
51bbfa0c | 1941 | /* Define the boundary of the register parm stack space that needs to be |
b820d2b8 AM |
1942 | saved, if any. */ |
1943 | int low_to_save, high_to_save; | |
51bbfa0c RS |
1944 | rtx save_area = 0; /* Place that it is saved */ |
1945 | #endif | |
1946 | ||
51bbfa0c RS |
1947 | int initial_highest_arg_in_use = highest_outgoing_arg_in_use; |
1948 | char *initial_stack_usage_map = stack_usage_map; | |
d9725c41 | 1949 | char *stack_usage_map_buf = NULL; |
51bbfa0c | 1950 | |
38afb23f OH |
1951 | int old_stack_allocated; |
1952 | ||
1953 | /* State variables to track stack modifications. */ | |
51bbfa0c | 1954 | rtx old_stack_level = 0; |
38afb23f | 1955 | int old_stack_arg_under_construction = 0; |
79be3418 | 1956 | int old_pending_adj = 0; |
51bbfa0c | 1957 | int old_inhibit_defer_pop = inhibit_defer_pop; |
38afb23f OH |
1958 | |
1959 | /* Some stack pointer alterations we make are performed via | |
1960 | allocate_dynamic_stack_space. This modifies the stack_pointer_delta, | |
1961 | which we then also need to save/restore along the way. */ | |
a259f218 | 1962 | int old_stack_pointer_delta = 0; |
38afb23f | 1963 | |
0a1c58a2 | 1964 | rtx call_fusage; |
5039610b SL |
1965 | tree p = CALL_EXPR_FN (exp); |
1966 | tree addr = CALL_EXPR_FN (exp); | |
b3694847 | 1967 | int i; |
739fb049 | 1968 | /* The alignment of the stack, in bits. */ |
95899b34 | 1969 | unsigned HOST_WIDE_INT preferred_stack_boundary; |
739fb049 | 1970 | /* The alignment of the stack, in bytes. */ |
95899b34 | 1971 | unsigned HOST_WIDE_INT preferred_unit_stack_boundary; |
6de9cd9a DN |
1972 | /* The static chain value to use for this call. */ |
1973 | rtx static_chain_value; | |
f2d33f13 JH |
1974 | /* See if this is "nothrow" function call. */ |
1975 | if (TREE_NOTHROW (exp)) | |
1976 | flags |= ECF_NOTHROW; | |
1977 | ||
6de9cd9a DN |
1978 | /* See if we can find a DECL-node for the actual function, and get the |
1979 | function attributes (flags) from the function decl or type node. */ | |
39b0dce7 JM |
1980 | fndecl = get_callee_fndecl (exp); |
1981 | if (fndecl) | |
51bbfa0c | 1982 | { |
57782ad8 | 1983 | fntype = TREE_TYPE (fndecl); |
39b0dce7 | 1984 | flags |= flags_from_decl_or_type (fndecl); |
51bbfa0c | 1985 | } |
39b0dce7 | 1986 | else |
72954a4f | 1987 | { |
57782ad8 | 1988 | fntype = TREE_TYPE (TREE_TYPE (p)); |
57782ad8 | 1989 | flags |= flags_from_decl_or_type (fntype); |
72954a4f | 1990 | } |
7393c642 | 1991 | |
57782ad8 | 1992 | struct_value = targetm.calls.struct_value_rtx (fntype, 0); |
61f71b34 | 1993 | |
8c6a8269 RS |
1994 | /* Warn if this value is an aggregate type, |
1995 | regardless of which calling convention we are using for it. */ | |
ccf08a6e DD |
1996 | if (AGGREGATE_TYPE_P (TREE_TYPE (exp))) |
1997 | warning (OPT_Waggregate_return, "function call has aggregate value"); | |
8c6a8269 RS |
1998 | |
1999 | /* If the result of a pure or const function call is ignored (or void), | |
2000 | and none of its arguments are volatile, we can avoid expanding the | |
2001 | call and just evaluate the arguments for side-effects. */ | |
2002 | if ((flags & (ECF_CONST | ECF_PURE)) | |
2003 | && (ignore || target == const0_rtx | |
2004 | || TYPE_MODE (TREE_TYPE (exp)) == VOIDmode)) | |
2005 | { | |
2006 | bool volatilep = false; | |
2007 | tree arg; | |
078a18a4 | 2008 | call_expr_arg_iterator iter; |
8c6a8269 | 2009 | |
078a18a4 SL |
2010 | FOR_EACH_CALL_EXPR_ARG (arg, iter, exp) |
2011 | if (TREE_THIS_VOLATILE (arg)) | |
8c6a8269 RS |
2012 | { |
2013 | volatilep = true; | |
2014 | break; | |
2015 | } | |
2016 | ||
2017 | if (! volatilep) | |
2018 | { | |
078a18a4 SL |
2019 | FOR_EACH_CALL_EXPR_ARG (arg, iter, exp) |
2020 | expand_expr (arg, const0_rtx, VOIDmode, EXPAND_NORMAL); | |
8c6a8269 RS |
2021 | return const0_rtx; |
2022 | } | |
2023 | } | |
2024 | ||
6f90e075 | 2025 | #ifdef REG_PARM_STACK_SPACE |
6f90e075 JW |
2026 | reg_parm_stack_space = REG_PARM_STACK_SPACE (fndecl); |
2027 | #endif | |
6f90e075 | 2028 | |
f73ad30e JH |
2029 | #ifndef OUTGOING_REG_PARM_STACK_SPACE |
2030 | if (reg_parm_stack_space > 0 && PUSH_ARGS) | |
e5e809f4 JL |
2031 | must_preallocate = 1; |
2032 | #endif | |
2033 | ||
51bbfa0c RS |
2034 | /* Set up a place to return a structure. */ |
2035 | ||
2036 | /* Cater to broken compilers. */ | |
61f71b34 | 2037 | if (aggregate_value_p (exp, fndecl)) |
51bbfa0c RS |
2038 | { |
2039 | /* This call returns a big structure. */ | |
53d4257f | 2040 | flags &= ~(ECF_CONST | ECF_PURE | ECF_LIBCALL_BLOCK); |
51bbfa0c RS |
2041 | |
2042 | #ifdef PCC_STATIC_STRUCT_RETURN | |
9e7b1d0a RS |
2043 | { |
2044 | pcc_struct_value = 1; | |
9e7b1d0a RS |
2045 | } |
2046 | #else /* not PCC_STATIC_STRUCT_RETURN */ | |
2047 | { | |
2048 | struct_value_size = int_size_in_bytes (TREE_TYPE (exp)); | |
51bbfa0c | 2049 | |
fa47911c | 2050 | if (target && MEM_P (target) && CALL_EXPR_RETURN_SLOT_OPT (exp)) |
9e7b1d0a RS |
2051 | structure_value_addr = XEXP (target, 0); |
2052 | else | |
2053 | { | |
9e7b1d0a RS |
2054 | /* For variable-sized objects, we must be called with a target |
2055 | specified. If we were to allocate space on the stack here, | |
2056 | we would have no way of knowing when to free it. */ | |
1186ec8c | 2057 | rtx d = assign_temp (TREE_TYPE (exp), 0, 1, 1); |
51bbfa0c | 2058 | |
4361b41d MM |
2059 | mark_temp_addr_taken (d); |
2060 | structure_value_addr = XEXP (d, 0); | |
9e7b1d0a RS |
2061 | target = 0; |
2062 | } | |
2063 | } | |
2064 | #endif /* not PCC_STATIC_STRUCT_RETURN */ | |
51bbfa0c RS |
2065 | } |
2066 | ||
099e9712 | 2067 | /* Figure out the amount to which the stack should be aligned. */ |
099e9712 | 2068 | preferred_stack_boundary = PREFERRED_STACK_BOUNDARY; |
b255a036 JH |
2069 | if (fndecl) |
2070 | { | |
2071 | struct cgraph_rtl_info *i = cgraph_rtl_info (fndecl); | |
2072 | if (i && i->preferred_incoming_stack_boundary) | |
2073 | preferred_stack_boundary = i->preferred_incoming_stack_boundary; | |
2074 | } | |
099e9712 JH |
2075 | |
2076 | /* Operand 0 is a pointer-to-function; get the type of the function. */ | |
09e2bf48 | 2077 | funtype = TREE_TYPE (addr); |
366de0ce | 2078 | gcc_assert (POINTER_TYPE_P (funtype)); |
099e9712 JH |
2079 | funtype = TREE_TYPE (funtype); |
2080 | ||
078a18a4 SL |
2081 | /* Count whether there are actual complex arguments that need to be split |
2082 | into their real and imaginary parts. Munge the type_arg_types | |
2083 | appropriately here as well. */ | |
42ba5130 | 2084 | if (targetm.calls.split_complex_arg) |
ded9bf77 | 2085 | { |
078a18a4 SL |
2086 | call_expr_arg_iterator iter; |
2087 | tree arg; | |
2088 | FOR_EACH_CALL_EXPR_ARG (arg, iter, exp) | |
2089 | { | |
2090 | tree type = TREE_TYPE (arg); | |
2091 | if (type && TREE_CODE (type) == COMPLEX_TYPE | |
2092 | && targetm.calls.split_complex_arg (type)) | |
2093 | num_complex_actuals++; | |
2094 | } | |
ded9bf77 | 2095 | type_arg_types = split_complex_types (TYPE_ARG_TYPES (funtype)); |
ded9bf77 AH |
2096 | } |
2097 | else | |
2098 | type_arg_types = TYPE_ARG_TYPES (funtype); | |
2099 | ||
099e9712 JH |
2100 | if (flags & ECF_MAY_BE_ALLOCA) |
2101 | current_function_calls_alloca = 1; | |
2102 | ||
2103 | /* If struct_value_rtx is 0, it means pass the address | |
078a18a4 SL |
2104 | as if it were an extra parameter. Put the argument expression |
2105 | in structure_value_addr_value. */ | |
61f71b34 | 2106 | if (structure_value_addr && struct_value == 0) |
099e9712 JH |
2107 | { |
2108 | /* If structure_value_addr is a REG other than | |
2109 | virtual_outgoing_args_rtx, we can use always use it. If it | |
2110 | is not a REG, we must always copy it into a register. | |
2111 | If it is virtual_outgoing_args_rtx, we must copy it to another | |
2112 | register in some cases. */ | |
f8cfc6aa | 2113 | rtx temp = (!REG_P (structure_value_addr) |
099e9712 JH |
2114 | || (ACCUMULATE_OUTGOING_ARGS |
2115 | && stack_arg_under_construction | |
2116 | && structure_value_addr == virtual_outgoing_args_rtx) | |
7ae4ad28 | 2117 | ? copy_addr_to_reg (convert_memory_address |
57782ad8 | 2118 | (Pmode, structure_value_addr)) |
099e9712 JH |
2119 | : structure_value_addr); |
2120 | ||
078a18a4 SL |
2121 | structure_value_addr_value = |
2122 | make_tree (build_pointer_type (TREE_TYPE (funtype)), temp); | |
099e9712 JH |
2123 | structure_value_addr_parm = 1; |
2124 | } | |
2125 | ||
2126 | /* Count the arguments and set NUM_ACTUALS. */ | |
078a18a4 SL |
2127 | num_actuals = |
2128 | call_expr_nargs (exp) + num_complex_actuals + structure_value_addr_parm; | |
099e9712 JH |
2129 | |
2130 | /* Compute number of named args. | |
3a4d587b AM |
2131 | First, do a raw count of the args for INIT_CUMULATIVE_ARGS. */ |
2132 | ||
2133 | if (type_arg_types != 0) | |
2134 | n_named_args | |
2135 | = (list_length (type_arg_types) | |
2136 | /* Count the struct value address, if it is passed as a parm. */ | |
2137 | + structure_value_addr_parm); | |
2138 | else | |
2139 | /* If we know nothing, treat all args as named. */ | |
2140 | n_named_args = num_actuals; | |
2141 | ||
2142 | /* Start updating where the next arg would go. | |
2143 | ||
2144 | On some machines (such as the PA) indirect calls have a different | |
2145 | calling convention than normal calls. The fourth argument in | |
2146 | INIT_CUMULATIVE_ARGS tells the backend if this is an indirect call | |
2147 | or not. */ | |
2148 | INIT_CUMULATIVE_ARGS (args_so_far, funtype, NULL_RTX, fndecl, n_named_args); | |
2149 | ||
2150 | /* Now possibly adjust the number of named args. | |
099e9712 | 2151 | Normally, don't include the last named arg if anonymous args follow. |
3a179764 KH |
2152 | We do include the last named arg if |
2153 | targetm.calls.strict_argument_naming() returns nonzero. | |
099e9712 JH |
2154 | (If no anonymous args follow, the result of list_length is actually |
2155 | one too large. This is harmless.) | |
2156 | ||
4ac8340c | 2157 | If targetm.calls.pretend_outgoing_varargs_named() returns |
3a179764 KH |
2158 | nonzero, and targetm.calls.strict_argument_naming() returns zero, |
2159 | this machine will be able to place unnamed args that were passed | |
2160 | in registers into the stack. So treat all args as named. This | |
2161 | allows the insns emitting for a specific argument list to be | |
2162 | independent of the function declaration. | |
4ac8340c KH |
2163 | |
2164 | If targetm.calls.pretend_outgoing_varargs_named() returns zero, | |
2165 | we do not have any reliable way to pass unnamed args in | |
2166 | registers, so we must force them into memory. */ | |
099e9712 | 2167 | |
3a4d587b AM |
2168 | if (type_arg_types != 0 |
2169 | && targetm.calls.strict_argument_naming (&args_so_far)) | |
2170 | ; | |
2171 | else if (type_arg_types != 0 | |
2172 | && ! targetm.calls.pretend_outgoing_varargs_named (&args_so_far)) | |
2173 | /* Don't include the last named arg. */ | |
2174 | --n_named_args; | |
099e9712 | 2175 | else |
3a4d587b | 2176 | /* Treat all args as named. */ |
099e9712 JH |
2177 | n_named_args = num_actuals; |
2178 | ||
099e9712 | 2179 | /* Make a vector to hold all the information about each arg. */ |
703ad42b KG |
2180 | args = alloca (num_actuals * sizeof (struct arg_data)); |
2181 | memset (args, 0, num_actuals * sizeof (struct arg_data)); | |
099e9712 | 2182 | |
d80d2d2a KH |
2183 | /* Build up entries in the ARGS array, compute the size of the |
2184 | arguments into ARGS_SIZE, etc. */ | |
099e9712 | 2185 | initialize_argument_information (num_actuals, args, &args_size, |
078a18a4 SL |
2186 | n_named_args, exp, |
2187 | structure_value_addr_value, fndecl, | |
099e9712 JH |
2188 | &args_so_far, reg_parm_stack_space, |
2189 | &old_stack_level, &old_pending_adj, | |
dd292d0a | 2190 | &must_preallocate, &flags, |
6de9cd9a | 2191 | &try_tail_call, CALL_FROM_THUNK_P (exp)); |
099e9712 JH |
2192 | |
2193 | if (args_size.var) | |
2194 | { | |
2195 | /* If this function requires a variable-sized argument list, don't | |
2196 | try to make a cse'able block for this call. We may be able to | |
2197 | do this eventually, but it is too complicated to keep track of | |
6d2f8887 | 2198 | what insns go in the cse'able block and which don't. */ |
099e9712 | 2199 | |
53d4257f | 2200 | flags &= ~ECF_LIBCALL_BLOCK; |
099e9712 JH |
2201 | must_preallocate = 1; |
2202 | } | |
2203 | ||
2204 | /* Now make final decision about preallocating stack space. */ | |
2205 | must_preallocate = finalize_must_preallocate (must_preallocate, | |
2206 | num_actuals, args, | |
2207 | &args_size); | |
2208 | ||
2209 | /* If the structure value address will reference the stack pointer, we | |
2210 | must stabilize it. We don't need to do this if we know that we are | |
2211 | not going to adjust the stack pointer in processing this call. */ | |
2212 | ||
2213 | if (structure_value_addr | |
2214 | && (reg_mentioned_p (virtual_stack_dynamic_rtx, structure_value_addr) | |
2215 | || reg_mentioned_p (virtual_outgoing_args_rtx, | |
2216 | structure_value_addr)) | |
2217 | && (args_size.var | |
2218 | || (!ACCUMULATE_OUTGOING_ARGS && args_size.constant))) | |
2219 | structure_value_addr = copy_to_reg (structure_value_addr); | |
0a1c58a2 | 2220 | |
7ae4ad28 | 2221 | /* Tail calls can make things harder to debug, and we've traditionally |
194c7c45 | 2222 | pushed these optimizations into -O2. Don't try if we're already |
fb158467 | 2223 | expanding a call, as that means we're an argument. Don't try if |
3fbd86b1 | 2224 | there's cleanups, as we know there's code to follow the call. */ |
0a1c58a2 | 2225 | |
099e9712 JH |
2226 | if (currently_expanding_call++ != 0 |
2227 | || !flag_optimize_sibling_calls | |
6de9cd9a DN |
2228 | || args_size.var |
2229 | || lookup_stmt_eh_region (exp) >= 0) | |
2230 | try_tail_call = 0; | |
099e9712 JH |
2231 | |
2232 | /* Rest of purposes for tail call optimizations to fail. */ | |
2233 | if ( | |
2234 | #ifdef HAVE_sibcall_epilogue | |
2235 | !HAVE_sibcall_epilogue | |
2236 | #else | |
2237 | 1 | |
2238 | #endif | |
2239 | || !try_tail_call | |
2240 | /* Doing sibling call optimization needs some work, since | |
2241 | structure_value_addr can be allocated on the stack. | |
2242 | It does not seem worth the effort since few optimizable | |
2243 | sibling calls will return a structure. */ | |
2244 | || structure_value_addr != NULL_RTX | |
4977bab6 ZW |
2245 | /* Check whether the target is able to optimize the call |
2246 | into a sibcall. */ | |
5fd9b178 | 2247 | || !targetm.function_ok_for_sibcall (fndecl, exp) |
4977bab6 | 2248 | /* Functions that do not return exactly once may not be sibcall |
c22cacf3 | 2249 | optimized. */ |
6e14af16 | 2250 | || (flags & (ECF_RETURNS_TWICE | ECF_NORETURN)) |
09e2bf48 | 2251 | || TYPE_VOLATILE (TREE_TYPE (TREE_TYPE (addr))) |
6a48df45 | 2252 | /* If the called function is nested in the current one, it might access |
c22cacf3 MS |
2253 | some of the caller's arguments, but could clobber them beforehand if |
2254 | the argument areas are shared. */ | |
6a48df45 | 2255 | || (fndecl && decl_function_context (fndecl) == current_function_decl) |
099e9712 | 2256 | /* If this function requires more stack slots than the current |
ff7f012a DJ |
2257 | function, we cannot change it into a sibling call. |
2258 | current_function_pretend_args_size is not part of the | |
2259 | stack allocated by our caller. */ | |
2260 | || args_size.constant > (current_function_args_size | |
2261 | - current_function_pretend_args_size) | |
099e9712 JH |
2262 | /* If the callee pops its own arguments, then it must pop exactly |
2263 | the same number of arguments as the current function. */ | |
e076f71a AH |
2264 | || (RETURN_POPS_ARGS (fndecl, funtype, args_size.constant) |
2265 | != RETURN_POPS_ARGS (current_function_decl, | |
2266 | TREE_TYPE (current_function_decl), | |
2267 | current_function_args_size)) | |
ae2bcd98 | 2268 | || !lang_hooks.decls.ok_for_sibcall (fndecl)) |
e6f64875 | 2269 | try_tail_call = 0; |
497eb8c3 | 2270 | |
c2f8b491 JH |
2271 | /* Ensure current function's preferred stack boundary is at least |
2272 | what we need. We don't have to increase alignment for recursive | |
2273 | functions. */ | |
2274 | if (cfun->preferred_stack_boundary < preferred_stack_boundary | |
2275 | && fndecl != current_function_decl) | |
2276 | cfun->preferred_stack_boundary = preferred_stack_boundary; | |
b255a036 JH |
2277 | if (fndecl == current_function_decl) |
2278 | cfun->recursive_call_emit = true; | |
c2f8b491 | 2279 | |
099e9712 | 2280 | preferred_unit_stack_boundary = preferred_stack_boundary / BITS_PER_UNIT; |
497eb8c3 | 2281 | |
0a1c58a2 JL |
2282 | /* We want to make two insn chains; one for a sibling call, the other |
2283 | for a normal call. We will select one of the two chains after | |
2284 | initial RTL generation is complete. */ | |
b820d2b8 | 2285 | for (pass = try_tail_call ? 0 : 1; pass < 2; pass++) |
0a1c58a2 JL |
2286 | { |
2287 | int sibcall_failure = 0; | |
f5143c46 | 2288 | /* We want to emit any pending stack adjustments before the tail |
0a1c58a2 | 2289 | recursion "call". That way we know any adjustment after the tail |
7ae4ad28 | 2290 | recursion call can be ignored if we indeed use the tail |
0a1c58a2 | 2291 | call expansion. */ |
5ac9118e KG |
2292 | int save_pending_stack_adjust = 0; |
2293 | int save_stack_pointer_delta = 0; | |
0a1c58a2 | 2294 | rtx insns; |
7d167afd | 2295 | rtx before_call, next_arg_reg; |
39842893 | 2296 | |
0a1c58a2 JL |
2297 | if (pass == 0) |
2298 | { | |
0a1c58a2 JL |
2299 | /* State variables we need to save and restore between |
2300 | iterations. */ | |
2301 | save_pending_stack_adjust = pending_stack_adjust; | |
1503a7ec | 2302 | save_stack_pointer_delta = stack_pointer_delta; |
0a1c58a2 | 2303 | } |
f2d33f13 JH |
2304 | if (pass) |
2305 | flags &= ~ECF_SIBCALL; | |
2306 | else | |
2307 | flags |= ECF_SIBCALL; | |
51bbfa0c | 2308 | |
0a1c58a2 | 2309 | /* Other state variables that we must reinitialize each time |
f2d33f13 | 2310 | through the loop (that are not initialized by the loop itself). */ |
0a1c58a2 JL |
2311 | argblock = 0; |
2312 | call_fusage = 0; | |
fa76d9e0 | 2313 | |
f725a3ec | 2314 | /* Start a new sequence for the normal call case. |
51bbfa0c | 2315 | |
0a1c58a2 JL |
2316 | From this point on, if the sibling call fails, we want to set |
2317 | sibcall_failure instead of continuing the loop. */ | |
2318 | start_sequence (); | |
eecb6f50 | 2319 | |
0a1c58a2 JL |
2320 | /* Don't let pending stack adjusts add up to too much. |
2321 | Also, do all pending adjustments now if there is any chance | |
2322 | this might be a call to alloca or if we are expanding a sibling | |
b5cd4ed4 | 2323 | call sequence or if we are calling a function that is to return |
63579539 DJ |
2324 | with stack pointer depressed. |
2325 | Also do the adjustments before a throwing call, otherwise | |
2326 | exception handling can fail; PR 19225. */ | |
0a1c58a2 | 2327 | if (pending_stack_adjust >= 32 |
b5cd4ed4 RK |
2328 | || (pending_stack_adjust > 0 |
2329 | && (flags & (ECF_MAY_BE_ALLOCA | ECF_SP_DEPRESSED))) | |
63579539 DJ |
2330 | || (pending_stack_adjust > 0 |
2331 | && flag_exceptions && !(flags & ECF_NOTHROW)) | |
0a1c58a2 JL |
2332 | || pass == 0) |
2333 | do_pending_stack_adjust (); | |
51bbfa0c | 2334 | |
54fef245 RH |
2335 | /* When calling a const function, we must pop the stack args right away, |
2336 | so that the pop is deleted or moved with the call. */ | |
53d4257f | 2337 | if (pass && (flags & ECF_LIBCALL_BLOCK)) |
54fef245 RH |
2338 | NO_DEFER_POP; |
2339 | ||
0a1c58a2 | 2340 | /* Precompute any arguments as needed. */ |
f8a097cd JH |
2341 | if (pass) |
2342 | precompute_arguments (flags, num_actuals, args); | |
51bbfa0c | 2343 | |
0a1c58a2 JL |
2344 | /* Now we are about to start emitting insns that can be deleted |
2345 | if a libcall is deleted. */ | |
53d4257f | 2346 | if (pass && (flags & (ECF_LIBCALL_BLOCK | ECF_MALLOC))) |
0a1c58a2 | 2347 | start_sequence (); |
51bbfa0c | 2348 | |
b755446c RH |
2349 | if (pass == 0 && cfun->stack_protect_guard) |
2350 | stack_protect_epilogue (); | |
2351 | ||
099e9712 | 2352 | adjusted_args_size = args_size; |
ce48579b RH |
2353 | /* Compute the actual size of the argument block required. The variable |
2354 | and constant sizes must be combined, the size may have to be rounded, | |
2355 | and there may be a minimum required size. When generating a sibcall | |
2356 | pattern, do not round up, since we'll be re-using whatever space our | |
2357 | caller provided. */ | |
2358 | unadjusted_args_size | |
f725a3ec KH |
2359 | = compute_argument_block_size (reg_parm_stack_space, |
2360 | &adjusted_args_size, | |
ce48579b RH |
2361 | (pass == 0 ? 0 |
2362 | : preferred_stack_boundary)); | |
2363 | ||
f725a3ec | 2364 | old_stack_allocated = stack_pointer_delta - pending_stack_adjust; |
ce48579b | 2365 | |
f8a097cd | 2366 | /* The argument block when performing a sibling call is the |
c22cacf3 | 2367 | incoming argument block. */ |
f8a097cd | 2368 | if (pass == 0) |
c67846f2 JJ |
2369 | { |
2370 | argblock = virtual_incoming_args_rtx; | |
fcae219a R |
2371 | argblock |
2372 | #ifdef STACK_GROWS_DOWNWARD | |
2373 | = plus_constant (argblock, current_function_pretend_args_size); | |
2374 | #else | |
2375 | = plus_constant (argblock, -current_function_pretend_args_size); | |
2376 | #endif | |
c67846f2 JJ |
2377 | stored_args_map = sbitmap_alloc (args_size.constant); |
2378 | sbitmap_zero (stored_args_map); | |
2379 | } | |
ce48579b | 2380 | |
0a1c58a2 JL |
2381 | /* If we have no actual push instructions, or shouldn't use them, |
2382 | make space for all args right now. */ | |
099e9712 | 2383 | else if (adjusted_args_size.var != 0) |
51bbfa0c | 2384 | { |
0a1c58a2 JL |
2385 | if (old_stack_level == 0) |
2386 | { | |
2387 | emit_stack_save (SAVE_BLOCK, &old_stack_level, NULL_RTX); | |
38afb23f | 2388 | old_stack_pointer_delta = stack_pointer_delta; |
0a1c58a2 JL |
2389 | old_pending_adj = pending_stack_adjust; |
2390 | pending_stack_adjust = 0; | |
0a1c58a2 JL |
2391 | /* stack_arg_under_construction says whether a stack arg is |
2392 | being constructed at the old stack level. Pushing the stack | |
2393 | gets a clean outgoing argument block. */ | |
2394 | old_stack_arg_under_construction = stack_arg_under_construction; | |
2395 | stack_arg_under_construction = 0; | |
0a1c58a2 | 2396 | } |
099e9712 | 2397 | argblock = push_block (ARGS_SIZE_RTX (adjusted_args_size), 0, 0); |
51bbfa0c | 2398 | } |
0a1c58a2 JL |
2399 | else |
2400 | { | |
2401 | /* Note that we must go through the motions of allocating an argument | |
2402 | block even if the size is zero because we may be storing args | |
2403 | in the area reserved for register arguments, which may be part of | |
2404 | the stack frame. */ | |
26a258fe | 2405 | |
099e9712 | 2406 | int needed = adjusted_args_size.constant; |
51bbfa0c | 2407 | |
0a1c58a2 JL |
2408 | /* Store the maximum argument space used. It will be pushed by |
2409 | the prologue (if ACCUMULATE_OUTGOING_ARGS, or stack overflow | |
2410 | checking). */ | |
51bbfa0c | 2411 | |
0a1c58a2 JL |
2412 | if (needed > current_function_outgoing_args_size) |
2413 | current_function_outgoing_args_size = needed; | |
51bbfa0c | 2414 | |
0a1c58a2 JL |
2415 | if (must_preallocate) |
2416 | { | |
f73ad30e JH |
2417 | if (ACCUMULATE_OUTGOING_ARGS) |
2418 | { | |
f8a097cd JH |
2419 | /* Since the stack pointer will never be pushed, it is |
2420 | possible for the evaluation of a parm to clobber | |
2421 | something we have already written to the stack. | |
2422 | Since most function calls on RISC machines do not use | |
2423 | the stack, this is uncommon, but must work correctly. | |
26a258fe | 2424 | |
f73ad30e | 2425 | Therefore, we save any area of the stack that was already |
f8a097cd JH |
2426 | written and that we are using. Here we set up to do this |
2427 | by making a new stack usage map from the old one. The | |
f725a3ec | 2428 | actual save will be done by store_one_arg. |
26a258fe | 2429 | |
f73ad30e JH |
2430 | Another approach might be to try to reorder the argument |
2431 | evaluations to avoid this conflicting stack usage. */ | |
26a258fe | 2432 | |
e5e809f4 | 2433 | #ifndef OUTGOING_REG_PARM_STACK_SPACE |
f8a097cd JH |
2434 | /* Since we will be writing into the entire argument area, |
2435 | the map must be allocated for its entire size, not just | |
2436 | the part that is the responsibility of the caller. */ | |
f73ad30e | 2437 | needed += reg_parm_stack_space; |
51bbfa0c RS |
2438 | #endif |
2439 | ||
2440 | #ifdef ARGS_GROW_DOWNWARD | |
f73ad30e JH |
2441 | highest_outgoing_arg_in_use = MAX (initial_highest_arg_in_use, |
2442 | needed + 1); | |
51bbfa0c | 2443 | #else |
f73ad30e JH |
2444 | highest_outgoing_arg_in_use = MAX (initial_highest_arg_in_use, |
2445 | needed); | |
51bbfa0c | 2446 | #endif |
d9725c41 JJ |
2447 | if (stack_usage_map_buf) |
2448 | free (stack_usage_map_buf); | |
5ed6ace5 | 2449 | stack_usage_map_buf = XNEWVEC (char, highest_outgoing_arg_in_use); |
d9725c41 | 2450 | stack_usage_map = stack_usage_map_buf; |
51bbfa0c | 2451 | |
f73ad30e | 2452 | if (initial_highest_arg_in_use) |
2e09e75a JM |
2453 | memcpy (stack_usage_map, initial_stack_usage_map, |
2454 | initial_highest_arg_in_use); | |
2f4aa534 | 2455 | |
f73ad30e | 2456 | if (initial_highest_arg_in_use != highest_outgoing_arg_in_use) |
961192e1 | 2457 | memset (&stack_usage_map[initial_highest_arg_in_use], 0, |
f73ad30e JH |
2458 | (highest_outgoing_arg_in_use |
2459 | - initial_highest_arg_in_use)); | |
2460 | needed = 0; | |
2f4aa534 | 2461 | |
f8a097cd JH |
2462 | /* The address of the outgoing argument list must not be |
2463 | copied to a register here, because argblock would be left | |
2464 | pointing to the wrong place after the call to | |
f725a3ec | 2465 | allocate_dynamic_stack_space below. */ |
2f4aa534 | 2466 | |
f73ad30e | 2467 | argblock = virtual_outgoing_args_rtx; |
f725a3ec | 2468 | } |
f73ad30e | 2469 | else |
26a258fe | 2470 | { |
f73ad30e | 2471 | if (inhibit_defer_pop == 0) |
0a1c58a2 | 2472 | { |
f73ad30e | 2473 | /* Try to reuse some or all of the pending_stack_adjust |
ce48579b RH |
2474 | to get this space. */ |
2475 | needed | |
f725a3ec | 2476 | = (combine_pending_stack_adjustment_and_call |
ce48579b | 2477 | (unadjusted_args_size, |
099e9712 | 2478 | &adjusted_args_size, |
ce48579b RH |
2479 | preferred_unit_stack_boundary)); |
2480 | ||
2481 | /* combine_pending_stack_adjustment_and_call computes | |
2482 | an adjustment before the arguments are allocated. | |
2483 | Account for them and see whether or not the stack | |
2484 | needs to go up or down. */ | |
2485 | needed = unadjusted_args_size - needed; | |
2486 | ||
2487 | if (needed < 0) | |
f73ad30e | 2488 | { |
ce48579b RH |
2489 | /* We're releasing stack space. */ |
2490 | /* ??? We can avoid any adjustment at all if we're | |
2491 | already aligned. FIXME. */ | |
2492 | pending_stack_adjust = -needed; | |
2493 | do_pending_stack_adjust (); | |
f73ad30e JH |
2494 | needed = 0; |
2495 | } | |
f725a3ec | 2496 | else |
ce48579b RH |
2497 | /* We need to allocate space. We'll do that in |
2498 | push_block below. */ | |
2499 | pending_stack_adjust = 0; | |
0a1c58a2 | 2500 | } |
ce48579b RH |
2501 | |
2502 | /* Special case this because overhead of `push_block' in | |
2503 | this case is non-trivial. */ | |
f73ad30e JH |
2504 | if (needed == 0) |
2505 | argblock = virtual_outgoing_args_rtx; | |
0a1c58a2 | 2506 | else |
d892f288 DD |
2507 | { |
2508 | argblock = push_block (GEN_INT (needed), 0, 0); | |
2509 | #ifdef ARGS_GROW_DOWNWARD | |
2510 | argblock = plus_constant (argblock, needed); | |
2511 | #endif | |
2512 | } | |
f73ad30e | 2513 | |
f8a097cd JH |
2514 | /* We only really need to call `copy_to_reg' in the case |
2515 | where push insns are going to be used to pass ARGBLOCK | |
2516 | to a function call in ARGS. In that case, the stack | |
2517 | pointer changes value from the allocation point to the | |
2518 | call point, and hence the value of | |
2519 | VIRTUAL_OUTGOING_ARGS_RTX changes as well. But might | |
2520 | as well always do it. */ | |
f73ad30e | 2521 | argblock = copy_to_reg (argblock); |
38afb23f OH |
2522 | } |
2523 | } | |
2524 | } | |
0a1c58a2 | 2525 | |
38afb23f OH |
2526 | if (ACCUMULATE_OUTGOING_ARGS) |
2527 | { | |
2528 | /* The save/restore code in store_one_arg handles all | |
2529 | cases except one: a constructor call (including a C | |
2530 | function returning a BLKmode struct) to initialize | |
2531 | an argument. */ | |
2532 | if (stack_arg_under_construction) | |
2533 | { | |
e5e809f4 | 2534 | #ifndef OUTGOING_REG_PARM_STACK_SPACE |
38afb23f OH |
2535 | rtx push_size = GEN_INT (reg_parm_stack_space |
2536 | + adjusted_args_size.constant); | |
bfbf933a | 2537 | #else |
38afb23f | 2538 | rtx push_size = GEN_INT (adjusted_args_size.constant); |
bfbf933a | 2539 | #endif |
38afb23f OH |
2540 | if (old_stack_level == 0) |
2541 | { | |
2542 | emit_stack_save (SAVE_BLOCK, &old_stack_level, | |
2543 | NULL_RTX); | |
2544 | old_stack_pointer_delta = stack_pointer_delta; | |
2545 | old_pending_adj = pending_stack_adjust; | |
2546 | pending_stack_adjust = 0; | |
2547 | /* stack_arg_under_construction says whether a stack | |
2548 | arg is being constructed at the old stack level. | |
2549 | Pushing the stack gets a clean outgoing argument | |
2550 | block. */ | |
2551 | old_stack_arg_under_construction | |
2552 | = stack_arg_under_construction; | |
2553 | stack_arg_under_construction = 0; | |
2554 | /* Make a new map for the new argument list. */ | |
d9725c41 JJ |
2555 | if (stack_usage_map_buf) |
2556 | free (stack_usage_map_buf); | |
b9eae1a9 | 2557 | stack_usage_map_buf = XCNEWVEC (char, highest_outgoing_arg_in_use); |
d9725c41 | 2558 | stack_usage_map = stack_usage_map_buf; |
38afb23f | 2559 | highest_outgoing_arg_in_use = 0; |
f73ad30e | 2560 | } |
38afb23f OH |
2561 | allocate_dynamic_stack_space (push_size, NULL_RTX, |
2562 | BITS_PER_UNIT); | |
0a1c58a2 | 2563 | } |
bfbf933a | 2564 | |
38afb23f OH |
2565 | /* If argument evaluation might modify the stack pointer, |
2566 | copy the address of the argument list to a register. */ | |
2567 | for (i = 0; i < num_actuals; i++) | |
2568 | if (args[i].pass_on_stack) | |
2569 | { | |
2570 | argblock = copy_addr_to_reg (argblock); | |
2571 | break; | |
2572 | } | |
2573 | } | |
d329e058 | 2574 | |
0a1c58a2 | 2575 | compute_argument_addresses (args, argblock, num_actuals); |
bfbf933a | 2576 | |
0a1c58a2 JL |
2577 | /* If we push args individually in reverse order, perform stack alignment |
2578 | before the first push (the last arg). */ | |
f73ad30e | 2579 | if (PUSH_ARGS_REVERSED && argblock == 0 |
099e9712 | 2580 | && adjusted_args_size.constant != unadjusted_args_size) |
4e217aed | 2581 | { |
0a1c58a2 JL |
2582 | /* When the stack adjustment is pending, we get better code |
2583 | by combining the adjustments. */ | |
f725a3ec | 2584 | if (pending_stack_adjust |
53d4257f | 2585 | && ! (flags & ECF_LIBCALL_BLOCK) |
0a1c58a2 | 2586 | && ! inhibit_defer_pop) |
ce48579b RH |
2587 | { |
2588 | pending_stack_adjust | |
f725a3ec | 2589 | = (combine_pending_stack_adjustment_and_call |
ce48579b | 2590 | (unadjusted_args_size, |
099e9712 | 2591 | &adjusted_args_size, |
ce48579b RH |
2592 | preferred_unit_stack_boundary)); |
2593 | do_pending_stack_adjust (); | |
2594 | } | |
0a1c58a2 | 2595 | else if (argblock == 0) |
099e9712 | 2596 | anti_adjust_stack (GEN_INT (adjusted_args_size.constant |
0a1c58a2 | 2597 | - unadjusted_args_size)); |
0a1c58a2 | 2598 | } |
ebcd0b57 JH |
2599 | /* Now that the stack is properly aligned, pops can't safely |
2600 | be deferred during the evaluation of the arguments. */ | |
2601 | NO_DEFER_POP; | |
51bbfa0c | 2602 | |
09e2bf48 | 2603 | funexp = rtx_for_function_call (fndecl, addr); |
51bbfa0c | 2604 | |
0a1c58a2 JL |
2605 | /* Figure out the register where the value, if any, will come back. */ |
2606 | valreg = 0; | |
2607 | if (TYPE_MODE (TREE_TYPE (exp)) != VOIDmode | |
2608 | && ! structure_value_addr) | |
2609 | { | |
2610 | if (pcc_struct_value) | |
2611 | valreg = hard_function_value (build_pointer_type (TREE_TYPE (exp)), | |
1d636cc6 | 2612 | fndecl, NULL, (pass == 0)); |
0a1c58a2 | 2613 | else |
1d636cc6 RG |
2614 | valreg = hard_function_value (TREE_TYPE (exp), fndecl, fntype, |
2615 | (pass == 0)); | |
576c9028 KH |
2616 | |
2617 | /* If VALREG is a PARALLEL whose first member has a zero | |
2618 | offset, use that. This is for targets such as m68k that | |
2619 | return the same value in multiple places. */ | |
2620 | if (GET_CODE (valreg) == PARALLEL) | |
2621 | { | |
2622 | rtx elem = XVECEXP (valreg, 0, 0); | |
2623 | rtx where = XEXP (elem, 0); | |
2624 | rtx offset = XEXP (elem, 1); | |
2625 | if (offset == const0_rtx | |
2626 | && GET_MODE (where) == GET_MODE (valreg)) | |
2627 | valreg = where; | |
2628 | } | |
0a1c58a2 | 2629 | } |
51bbfa0c | 2630 | |
0a1c58a2 JL |
2631 | /* Precompute all register parameters. It isn't safe to compute anything |
2632 | once we have started filling any specific hard regs. */ | |
2633 | precompute_register_parameters (num_actuals, args, ®_parm_seen); | |
51bbfa0c | 2634 | |
5039610b SL |
2635 | if (CALL_EXPR_STATIC_CHAIN (exp)) |
2636 | static_chain_value = expand_normal (CALL_EXPR_STATIC_CHAIN (exp)); | |
6de9cd9a DN |
2637 | else |
2638 | static_chain_value = 0; | |
2639 | ||
f73ad30e | 2640 | #ifdef REG_PARM_STACK_SPACE |
0a1c58a2 JL |
2641 | /* Save the fixed argument area if it's part of the caller's frame and |
2642 | is clobbered by argument setup for this call. */ | |
f8a097cd | 2643 | if (ACCUMULATE_OUTGOING_ARGS && pass) |
f73ad30e JH |
2644 | save_area = save_fixed_argument_area (reg_parm_stack_space, argblock, |
2645 | &low_to_save, &high_to_save); | |
b94301c2 | 2646 | #endif |
51bbfa0c | 2647 | |
0a1c58a2 JL |
2648 | /* Now store (and compute if necessary) all non-register parms. |
2649 | These come before register parms, since they can require block-moves, | |
2650 | which could clobber the registers used for register parms. | |
2651 | Parms which have partial registers are not stored here, | |
2652 | but we do preallocate space here if they want that. */ | |
51bbfa0c | 2653 | |
0a1c58a2 JL |
2654 | for (i = 0; i < num_actuals; i++) |
2655 | if (args[i].reg == 0 || args[i].pass_on_stack) | |
c67846f2 JJ |
2656 | { |
2657 | rtx before_arg = get_last_insn (); | |
2658 | ||
4c6b3b2a JJ |
2659 | if (store_one_arg (&args[i], argblock, flags, |
2660 | adjusted_args_size.var != 0, | |
2661 | reg_parm_stack_space) | |
2662 | || (pass == 0 | |
2663 | && check_sibcall_argument_overlap (before_arg, | |
0cdca92b | 2664 | &args[i], 1))) |
c67846f2 | 2665 | sibcall_failure = 1; |
2fabc3d6 JDA |
2666 | |
2667 | if (flags & ECF_CONST | |
2668 | && args[i].stack | |
2669 | && args[i].value == args[i].stack) | |
2670 | call_fusage = gen_rtx_EXPR_LIST (VOIDmode, | |
2671 | gen_rtx_USE (VOIDmode, | |
2672 | args[i].value), | |
2673 | call_fusage); | |
c67846f2 | 2674 | } |
0a1c58a2 JL |
2675 | |
2676 | /* If we have a parm that is passed in registers but not in memory | |
2677 | and whose alignment does not permit a direct copy into registers, | |
2678 | make a group of pseudos that correspond to each register that we | |
2679 | will later fill. */ | |
2680 | if (STRICT_ALIGNMENT) | |
2681 | store_unaligned_arguments_into_pseudos (args, num_actuals); | |
2682 | ||
2683 | /* Now store any partially-in-registers parm. | |
2684 | This is the last place a block-move can happen. */ | |
2685 | if (reg_parm_seen) | |
2686 | for (i = 0; i < num_actuals; i++) | |
2687 | if (args[i].partial != 0 && ! args[i].pass_on_stack) | |
c67846f2 JJ |
2688 | { |
2689 | rtx before_arg = get_last_insn (); | |
2690 | ||
4c6b3b2a JJ |
2691 | if (store_one_arg (&args[i], argblock, flags, |
2692 | adjusted_args_size.var != 0, | |
2693 | reg_parm_stack_space) | |
2694 | || (pass == 0 | |
2695 | && check_sibcall_argument_overlap (before_arg, | |
0cdca92b | 2696 | &args[i], 1))) |
c67846f2 JJ |
2697 | sibcall_failure = 1; |
2698 | } | |
51bbfa0c | 2699 | |
0a1c58a2 JL |
2700 | /* If we pushed args in forward order, perform stack alignment |
2701 | after pushing the last arg. */ | |
f73ad30e | 2702 | if (!PUSH_ARGS_REVERSED && argblock == 0) |
099e9712 | 2703 | anti_adjust_stack (GEN_INT (adjusted_args_size.constant |
0a1c58a2 | 2704 | - unadjusted_args_size)); |
51bbfa0c | 2705 | |
0a1c58a2 JL |
2706 | /* If register arguments require space on the stack and stack space |
2707 | was not preallocated, allocate stack space here for arguments | |
2708 | passed in registers. */ | |
f73ad30e JH |
2709 | #ifdef OUTGOING_REG_PARM_STACK_SPACE |
2710 | if (!ACCUMULATE_OUTGOING_ARGS | |
f725a3ec | 2711 | && must_preallocate == 0 && reg_parm_stack_space > 0) |
0a1c58a2 | 2712 | anti_adjust_stack (GEN_INT (reg_parm_stack_space)); |
756e0e12 RS |
2713 | #endif |
2714 | ||
0a1c58a2 JL |
2715 | /* Pass the function the address in which to return a |
2716 | structure value. */ | |
2717 | if (pass != 0 && structure_value_addr && ! structure_value_addr_parm) | |
2718 | { | |
7ae4ad28 | 2719 | structure_value_addr |
5ae6cd0d | 2720 | = convert_memory_address (Pmode, structure_value_addr); |
61f71b34 | 2721 | emit_move_insn (struct_value, |
0a1c58a2 JL |
2722 | force_reg (Pmode, |
2723 | force_operand (structure_value_addr, | |
2724 | NULL_RTX))); | |
2725 | ||
f8cfc6aa | 2726 | if (REG_P (struct_value)) |
61f71b34 | 2727 | use_reg (&call_fusage, struct_value); |
0a1c58a2 | 2728 | } |
c2939b57 | 2729 | |
6de9cd9a DN |
2730 | funexp = prepare_call_address (funexp, static_chain_value, |
2731 | &call_fusage, reg_parm_seen, pass == 0); | |
51bbfa0c | 2732 | |
0cdca92b DJ |
2733 | load_register_parameters (args, num_actuals, &call_fusage, flags, |
2734 | pass == 0, &sibcall_failure); | |
f725a3ec | 2735 | |
0a1c58a2 JL |
2736 | /* Save a pointer to the last insn before the call, so that we can |
2737 | later safely search backwards to find the CALL_INSN. */ | |
2738 | before_call = get_last_insn (); | |
51bbfa0c | 2739 | |
7d167afd JJ |
2740 | /* Set up next argument register. For sibling calls on machines |
2741 | with register windows this should be the incoming register. */ | |
2742 | #ifdef FUNCTION_INCOMING_ARG | |
2743 | if (pass == 0) | |
2744 | next_arg_reg = FUNCTION_INCOMING_ARG (args_so_far, VOIDmode, | |
2745 | void_type_node, 1); | |
2746 | else | |
2747 | #endif | |
2748 | next_arg_reg = FUNCTION_ARG (args_so_far, VOIDmode, | |
2749 | void_type_node, 1); | |
2750 | ||
0a1c58a2 JL |
2751 | /* All arguments and registers used for the call must be set up by |
2752 | now! */ | |
2753 | ||
ce48579b | 2754 | /* Stack must be properly aligned now. */ |
366de0ce NS |
2755 | gcc_assert (!pass |
2756 | || !(stack_pointer_delta % preferred_unit_stack_boundary)); | |
ebcd0b57 | 2757 | |
0a1c58a2 | 2758 | /* Generate the actual call instruction. */ |
6de9cd9a | 2759 | emit_call_1 (funexp, exp, fndecl, funtype, unadjusted_args_size, |
099e9712 | 2760 | adjusted_args_size.constant, struct_value_size, |
7d167afd | 2761 | next_arg_reg, valreg, old_inhibit_defer_pop, call_fusage, |
fa5322fa | 2762 | flags, & args_so_far); |
0a1c58a2 | 2763 | |
bef5d8b6 RS |
2764 | /* If a non-BLKmode value is returned at the most significant end |
2765 | of a register, shift the register right by the appropriate amount | |
2766 | and update VALREG accordingly. BLKmode values are handled by the | |
2767 | group load/store machinery below. */ | |
2768 | if (!structure_value_addr | |
2769 | && !pcc_struct_value | |
2770 | && TYPE_MODE (TREE_TYPE (exp)) != BLKmode | |
2771 | && targetm.calls.return_in_msb (TREE_TYPE (exp))) | |
2772 | { | |
2773 | if (shift_return_value (TYPE_MODE (TREE_TYPE (exp)), false, valreg)) | |
2774 | sibcall_failure = 1; | |
2775 | valreg = gen_rtx_REG (TYPE_MODE (TREE_TYPE (exp)), REGNO (valreg)); | |
2776 | } | |
2777 | ||
0a1c58a2 JL |
2778 | /* If call is cse'able, make appropriate pair of reg-notes around it. |
2779 | Test valreg so we don't crash; may safely ignore `const' | |
2780 | if return type is void. Disable for PARALLEL return values, because | |
2781 | we have no way to move such values into a pseudo register. */ | |
53d4257f | 2782 | if (pass && (flags & ECF_LIBCALL_BLOCK)) |
9ae8ffe7 | 2783 | { |
0a1c58a2 | 2784 | rtx insns; |
9778f2f8 JH |
2785 | rtx insn; |
2786 | bool failed = valreg == 0 || GET_CODE (valreg) == PARALLEL; | |
9ae8ffe7 | 2787 | |
c22cacf3 | 2788 | insns = get_insns (); |
9778f2f8 JH |
2789 | |
2790 | /* Expansion of block moves possibly introduced a loop that may | |
2791 | not appear inside libcall block. */ | |
2792 | for (insn = insns; insn; insn = NEXT_INSN (insn)) | |
4b4bf941 | 2793 | if (JUMP_P (insn)) |
9778f2f8 JH |
2794 | failed = true; |
2795 | ||
2796 | if (failed) | |
e4abc3d5 | 2797 | { |
e4abc3d5 | 2798 | end_sequence (); |
2f937369 | 2799 | emit_insn (insns); |
e4abc3d5 RH |
2800 | } |
2801 | else | |
2802 | { | |
2803 | rtx note = 0; | |
2804 | rtx temp = gen_reg_rtx (GET_MODE (valreg)); | |
2805 | ||
2806 | /* Mark the return value as a pointer if needed. */ | |
2807 | if (TREE_CODE (TREE_TYPE (exp)) == POINTER_TYPE) | |
2808 | mark_reg_pointer (temp, | |
2809 | TYPE_ALIGN (TREE_TYPE (TREE_TYPE (exp)))); | |
2810 | ||
e4abc3d5 | 2811 | end_sequence (); |
8f23fc81 MM |
2812 | if (flag_unsafe_math_optimizations |
2813 | && fndecl | |
8c96cd51 | 2814 | && DECL_BUILT_IN_CLASS (fndecl) == BUILT_IN_NORMAL |
8f23fc81 MM |
2815 | && (DECL_FUNCTION_CODE (fndecl) == BUILT_IN_SQRT |
2816 | || DECL_FUNCTION_CODE (fndecl) == BUILT_IN_SQRTF | |
2817 | || DECL_FUNCTION_CODE (fndecl) == BUILT_IN_SQRTL)) | |
7ae4ad28 EC |
2818 | note = gen_rtx_fmt_e (SQRT, |
2819 | GET_MODE (temp), | |
8f23fc81 MM |
2820 | args[0].initial_value); |
2821 | else | |
2822 | { | |
2823 | /* Construct an "equal form" for the value which | |
2824 | mentions all the arguments in order as well as | |
2825 | the function name. */ | |
2826 | for (i = 0; i < num_actuals; i++) | |
2827 | note = gen_rtx_EXPR_LIST (VOIDmode, | |
2828 | args[i].initial_value, note); | |
2829 | note = gen_rtx_EXPR_LIST (VOIDmode, funexp, note); | |
7ae4ad28 | 2830 | |
8f23fc81 MM |
2831 | if (flags & ECF_PURE) |
2832 | note = gen_rtx_EXPR_LIST (VOIDmode, | |
e4abc3d5 RH |
2833 | gen_rtx_USE (VOIDmode, |
2834 | gen_rtx_MEM (BLKmode, | |
2835 | gen_rtx_SCRATCH (VOIDmode))), | |
2836 | note); | |
8f23fc81 | 2837 | } |
e4abc3d5 RH |
2838 | emit_libcall_block (insns, temp, valreg, note); |
2839 | ||
2840 | valreg = temp; | |
2841 | } | |
0a1c58a2 | 2842 | } |
53d4257f | 2843 | else if (pass && (flags & ECF_MALLOC)) |
0a1c58a2 JL |
2844 | { |
2845 | rtx temp = gen_reg_rtx (GET_MODE (valreg)); | |
2846 | rtx last, insns; | |
2847 | ||
f725a3ec | 2848 | /* The return value from a malloc-like function is a pointer. */ |
0a1c58a2 | 2849 | if (TREE_CODE (TREE_TYPE (exp)) == POINTER_TYPE) |
bdb429a5 | 2850 | mark_reg_pointer (temp, BIGGEST_ALIGNMENT); |
0a1c58a2 JL |
2851 | |
2852 | emit_move_insn (temp, valreg); | |
2853 | ||
2854 | /* The return value from a malloc-like function can not alias | |
2855 | anything else. */ | |
2856 | last = get_last_insn (); | |
f725a3ec | 2857 | REG_NOTES (last) = |
0a1c58a2 JL |
2858 | gen_rtx_EXPR_LIST (REG_NOALIAS, temp, REG_NOTES (last)); |
2859 | ||
2860 | /* Write out the sequence. */ | |
2861 | insns = get_insns (); | |
2862 | end_sequence (); | |
2f937369 | 2863 | emit_insn (insns); |
0a1c58a2 JL |
2864 | valreg = temp; |
2865 | } | |
51bbfa0c | 2866 | |
0a1c58a2 JL |
2867 | /* For calls to `setjmp', etc., inform flow.c it should complain |
2868 | if nonvolatile values are live. For functions that cannot return, | |
2869 | inform flow that control does not fall through. */ | |
51bbfa0c | 2870 | |
6e14af16 | 2871 | if ((flags & ECF_NORETURN) || pass == 0) |
c2939b57 | 2872 | { |
570a98eb | 2873 | /* The barrier must be emitted |
0a1c58a2 JL |
2874 | immediately after the CALL_INSN. Some ports emit more |
2875 | than just a CALL_INSN above, so we must search for it here. */ | |
51bbfa0c | 2876 | |
0a1c58a2 | 2877 | rtx last = get_last_insn (); |
4b4bf941 | 2878 | while (!CALL_P (last)) |
0a1c58a2 JL |
2879 | { |
2880 | last = PREV_INSN (last); | |
2881 | /* There was no CALL_INSN? */ | |
366de0ce | 2882 | gcc_assert (last != before_call); |
0a1c58a2 | 2883 | } |
51bbfa0c | 2884 | |
570a98eb | 2885 | emit_barrier_after (last); |
8af61113 | 2886 | |
f451eeef JS |
2887 | /* Stack adjustments after a noreturn call are dead code. |
2888 | However when NO_DEFER_POP is in effect, we must preserve | |
2889 | stack_pointer_delta. */ | |
2890 | if (inhibit_defer_pop == 0) | |
2891 | { | |
2892 | stack_pointer_delta = old_stack_allocated; | |
2893 | pending_stack_adjust = 0; | |
2894 | } | |
0a1c58a2 | 2895 | } |
51bbfa0c | 2896 | |
0a1c58a2 | 2897 | /* If value type not void, return an rtx for the value. */ |
51bbfa0c | 2898 | |
0a1c58a2 JL |
2899 | if (TYPE_MODE (TREE_TYPE (exp)) == VOIDmode |
2900 | || ignore) | |
b5cd4ed4 | 2901 | target = const0_rtx; |
0a1c58a2 JL |
2902 | else if (structure_value_addr) |
2903 | { | |
3c0cb5de | 2904 | if (target == 0 || !MEM_P (target)) |
0a1c58a2 | 2905 | { |
3bdf5ad1 RK |
2906 | target |
2907 | = gen_rtx_MEM (TYPE_MODE (TREE_TYPE (exp)), | |
2908 | memory_address (TYPE_MODE (TREE_TYPE (exp)), | |
2909 | structure_value_addr)); | |
2910 | set_mem_attributes (target, exp, 1); | |
0a1c58a2 JL |
2911 | } |
2912 | } | |
2913 | else if (pcc_struct_value) | |
cacbd532 | 2914 | { |
0a1c58a2 JL |
2915 | /* This is the special C++ case where we need to |
2916 | know what the true target was. We take care to | |
2917 | never use this value more than once in one expression. */ | |
2918 | target = gen_rtx_MEM (TYPE_MODE (TREE_TYPE (exp)), | |
2919 | copy_to_reg (valreg)); | |
3bdf5ad1 | 2920 | set_mem_attributes (target, exp, 1); |
cacbd532 | 2921 | } |
0a1c58a2 JL |
2922 | /* Handle calls that return values in multiple non-contiguous locations. |
2923 | The Irix 6 ABI has examples of this. */ | |
2924 | else if (GET_CODE (valreg) == PARALLEL) | |
2925 | { | |
6de9cd9a | 2926 | if (target == 0) |
0a1c58a2 | 2927 | { |
1da68f56 RK |
2928 | /* This will only be assigned once, so it can be readonly. */ |
2929 | tree nt = build_qualified_type (TREE_TYPE (exp), | |
2930 | (TYPE_QUALS (TREE_TYPE (exp)) | |
2931 | | TYPE_QUAL_CONST)); | |
2932 | ||
2933 | target = assign_temp (nt, 0, 1, 1); | |
0a1c58a2 JL |
2934 | } |
2935 | ||
2936 | if (! rtx_equal_p (target, valreg)) | |
6e985040 | 2937 | emit_group_store (target, valreg, TREE_TYPE (exp), |
04050c69 | 2938 | int_size_in_bytes (TREE_TYPE (exp))); |
19caa751 | 2939 | |
0a1c58a2 JL |
2940 | /* We can not support sibling calls for this case. */ |
2941 | sibcall_failure = 1; | |
2942 | } | |
2943 | else if (target | |
2944 | && GET_MODE (target) == TYPE_MODE (TREE_TYPE (exp)) | |
2945 | && GET_MODE (target) == GET_MODE (valreg)) | |
2946 | { | |
51caaefe EB |
2947 | bool may_overlap = false; |
2948 | ||
f2d18690 KK |
2949 | /* We have to copy a return value in a CLASS_LIKELY_SPILLED hard |
2950 | reg to a plain register. */ | |
2951 | if (REG_P (valreg) | |
2952 | && HARD_REGISTER_P (valreg) | |
2953 | && CLASS_LIKELY_SPILLED_P (REGNO_REG_CLASS (REGNO (valreg))) | |
2954 | && !(REG_P (target) && !HARD_REGISTER_P (target))) | |
2955 | valreg = copy_to_reg (valreg); | |
2956 | ||
51caaefe EB |
2957 | /* If TARGET is a MEM in the argument area, and we have |
2958 | saved part of the argument area, then we can't store | |
2959 | directly into TARGET as it may get overwritten when we | |
2960 | restore the argument save area below. Don't work too | |
2961 | hard though and simply force TARGET to a register if it | |
2962 | is a MEM; the optimizer is quite likely to sort it out. */ | |
2963 | if (ACCUMULATE_OUTGOING_ARGS && pass && MEM_P (target)) | |
2964 | for (i = 0; i < num_actuals; i++) | |
2965 | if (args[i].save_area) | |
2966 | { | |
2967 | may_overlap = true; | |
2968 | break; | |
2969 | } | |
0219237c | 2970 | |
51caaefe EB |
2971 | if (may_overlap) |
2972 | target = copy_to_reg (valreg); | |
2973 | else | |
2974 | { | |
2975 | /* TARGET and VALREG cannot be equal at this point | |
2976 | because the latter would not have | |
2977 | REG_FUNCTION_VALUE_P true, while the former would if | |
2978 | it were referring to the same register. | |
2979 | ||
2980 | If they refer to the same register, this move will be | |
2981 | a no-op, except when function inlining is being | |
2982 | done. */ | |
2983 | emit_move_insn (target, valreg); | |
2984 | ||
2985 | /* If we are setting a MEM, this code must be executed. | |
2986 | Since it is emitted after the call insn, sibcall | |
2987 | optimization cannot be performed in that case. */ | |
2988 | if (MEM_P (target)) | |
2989 | sibcall_failure = 1; | |
2990 | } | |
0a1c58a2 JL |
2991 | } |
2992 | else if (TYPE_MODE (TREE_TYPE (exp)) == BLKmode) | |
8eb99146 RH |
2993 | { |
2994 | target = copy_blkmode_from_reg (target, valreg, TREE_TYPE (exp)); | |
2995 | ||
2996 | /* We can not support sibling calls for this case. */ | |
2997 | sibcall_failure = 1; | |
2998 | } | |
0a1c58a2 | 2999 | else |
bef5d8b6 | 3000 | target = copy_to_reg (valreg); |
51bbfa0c | 3001 | |
61f71b34 DD |
3002 | if (targetm.calls.promote_function_return(funtype)) |
3003 | { | |
366de0ce NS |
3004 | /* If we promoted this return value, make the proper SUBREG. |
3005 | TARGET might be const0_rtx here, so be careful. */ | |
3006 | if (REG_P (target) | |
3007 | && TYPE_MODE (TREE_TYPE (exp)) != BLKmode | |
3008 | && GET_MODE (target) != TYPE_MODE (TREE_TYPE (exp))) | |
3009 | { | |
3010 | tree type = TREE_TYPE (exp); | |
3011 | int unsignedp = TYPE_UNSIGNED (type); | |
3012 | int offset = 0; | |
3013 | enum machine_mode pmode; | |
c22cacf3 | 3014 | |
366de0ce NS |
3015 | pmode = promote_mode (type, TYPE_MODE (type), &unsignedp, 1); |
3016 | /* If we don't promote as expected, something is wrong. */ | |
3017 | gcc_assert (GET_MODE (target) == pmode); | |
c22cacf3 | 3018 | |
366de0ce NS |
3019 | if ((WORDS_BIG_ENDIAN || BYTES_BIG_ENDIAN) |
3020 | && (GET_MODE_SIZE (GET_MODE (target)) | |
3021 | > GET_MODE_SIZE (TYPE_MODE (type)))) | |
3022 | { | |
3023 | offset = GET_MODE_SIZE (GET_MODE (target)) | |
3024 | - GET_MODE_SIZE (TYPE_MODE (type)); | |
3025 | if (! BYTES_BIG_ENDIAN) | |
3026 | offset = (offset / UNITS_PER_WORD) * UNITS_PER_WORD; | |
3027 | else if (! WORDS_BIG_ENDIAN) | |
3028 | offset %= UNITS_PER_WORD; | |
3029 | } | |
3030 | target = gen_rtx_SUBREG (TYPE_MODE (type), target, offset); | |
3031 | SUBREG_PROMOTED_VAR_P (target) = 1; | |
3032 | SUBREG_PROMOTED_UNSIGNED_SET (target, unsignedp); | |
3033 | } | |
61f71b34 | 3034 | } |
84b55618 | 3035 | |
0a1c58a2 JL |
3036 | /* If size of args is variable or this was a constructor call for a stack |
3037 | argument, restore saved stack-pointer value. */ | |
51bbfa0c | 3038 | |
7393c642 | 3039 | if (old_stack_level && ! (flags & ECF_SP_DEPRESSED)) |
0a1c58a2 JL |
3040 | { |
3041 | emit_stack_restore (SAVE_BLOCK, old_stack_level, NULL_RTX); | |
38afb23f | 3042 | stack_pointer_delta = old_stack_pointer_delta; |
0a1c58a2 | 3043 | pending_stack_adjust = old_pending_adj; |
d25cee4d | 3044 | old_stack_allocated = stack_pointer_delta - pending_stack_adjust; |
0a1c58a2 JL |
3045 | stack_arg_under_construction = old_stack_arg_under_construction; |
3046 | highest_outgoing_arg_in_use = initial_highest_arg_in_use; | |
3047 | stack_usage_map = initial_stack_usage_map; | |
0a1c58a2 JL |
3048 | sibcall_failure = 1; |
3049 | } | |
f8a097cd | 3050 | else if (ACCUMULATE_OUTGOING_ARGS && pass) |
0a1c58a2 | 3051 | { |
51bbfa0c | 3052 | #ifdef REG_PARM_STACK_SPACE |
0a1c58a2 | 3053 | if (save_area) |
b820d2b8 AM |
3054 | restore_fixed_argument_area (save_area, argblock, |
3055 | high_to_save, low_to_save); | |
b94301c2 | 3056 | #endif |
51bbfa0c | 3057 | |
0a1c58a2 JL |
3058 | /* If we saved any argument areas, restore them. */ |
3059 | for (i = 0; i < num_actuals; i++) | |
3060 | if (args[i].save_area) | |
3061 | { | |
3062 | enum machine_mode save_mode = GET_MODE (args[i].save_area); | |
3063 | rtx stack_area | |
3064 | = gen_rtx_MEM (save_mode, | |
3065 | memory_address (save_mode, | |
3066 | XEXP (args[i].stack_slot, 0))); | |
3067 | ||
3068 | if (save_mode != BLKmode) | |
3069 | emit_move_insn (stack_area, args[i].save_area); | |
3070 | else | |
44bb111a | 3071 | emit_block_move (stack_area, args[i].save_area, |
e7949876 | 3072 | GEN_INT (args[i].locate.size.constant), |
44bb111a | 3073 | BLOCK_OP_CALL_PARM); |
0a1c58a2 | 3074 | } |
51bbfa0c | 3075 | |
0a1c58a2 JL |
3076 | highest_outgoing_arg_in_use = initial_highest_arg_in_use; |
3077 | stack_usage_map = initial_stack_usage_map; | |
3078 | } | |
51bbfa0c | 3079 | |
f725a3ec | 3080 | /* If this was alloca, record the new stack level for nonlocal gotos. |
0a1c58a2 JL |
3081 | Check for the handler slots since we might not have a save area |
3082 | for non-local gotos. */ | |
59257ff7 | 3083 | |
6de9cd9a DN |
3084 | if ((flags & ECF_MAY_BE_ALLOCA) && cfun->nonlocal_goto_save_area != 0) |
3085 | update_nonlocal_goto_save_area (); | |
51bbfa0c | 3086 | |
0a1c58a2 JL |
3087 | /* Free up storage we no longer need. */ |
3088 | for (i = 0; i < num_actuals; ++i) | |
3089 | if (args[i].aligned_regs) | |
3090 | free (args[i].aligned_regs); | |
3091 | ||
3092 | insns = get_insns (); | |
3093 | end_sequence (); | |
3094 | ||
3095 | if (pass == 0) | |
3096 | { | |
3097 | tail_call_insns = insns; | |
3098 | ||
0a1c58a2 JL |
3099 | /* Restore the pending stack adjustment now that we have |
3100 | finished generating the sibling call sequence. */ | |
1503a7ec | 3101 | |
0a1c58a2 | 3102 | pending_stack_adjust = save_pending_stack_adjust; |
1503a7ec | 3103 | stack_pointer_delta = save_stack_pointer_delta; |
099e9712 JH |
3104 | |
3105 | /* Prepare arg structure for next iteration. */ | |
f725a3ec | 3106 | for (i = 0; i < num_actuals; i++) |
099e9712 JH |
3107 | { |
3108 | args[i].value = 0; | |
3109 | args[i].aligned_regs = 0; | |
3110 | args[i].stack = 0; | |
3111 | } | |
c67846f2 JJ |
3112 | |
3113 | sbitmap_free (stored_args_map); | |
0a1c58a2 JL |
3114 | } |
3115 | else | |
38afb23f OH |
3116 | { |
3117 | normal_call_insns = insns; | |
3118 | ||
3119 | /* Verify that we've deallocated all the stack we used. */ | |
6e14af16 | 3120 | gcc_assert ((flags & ECF_NORETURN) |
366de0ce NS |
3121 | || (old_stack_allocated |
3122 | == stack_pointer_delta - pending_stack_adjust)); | |
38afb23f | 3123 | } |
fadb729c JJ |
3124 | |
3125 | /* If something prevents making this a sibling call, | |
3126 | zero out the sequence. */ | |
3127 | if (sibcall_failure) | |
3128 | tail_call_insns = NULL_RTX; | |
6de9cd9a DN |
3129 | else |
3130 | break; | |
0a1c58a2 JL |
3131 | } |
3132 | ||
1ea7e6ad | 3133 | /* If tail call production succeeded, we need to remove REG_EQUIV notes on |
6de9cd9a DN |
3134 | arguments too, as argument area is now clobbered by the call. */ |
3135 | if (tail_call_insns) | |
0a1c58a2 | 3136 | { |
6de9cd9a DN |
3137 | emit_insn (tail_call_insns); |
3138 | cfun->tail_call_emit = true; | |
0a1c58a2 JL |
3139 | } |
3140 | else | |
2f937369 | 3141 | emit_insn (normal_call_insns); |
51bbfa0c | 3142 | |
0a1c58a2 | 3143 | currently_expanding_call--; |
8e6a59fe | 3144 | |
7393c642 RK |
3145 | /* If this function returns with the stack pointer depressed, ensure |
3146 | this block saves and restores the stack pointer, show it was | |
3147 | changed, and adjust for any outgoing arg space. */ | |
3148 | if (flags & ECF_SP_DEPRESSED) | |
3149 | { | |
3150 | clear_pending_stack_adjust (); | |
f84d109f | 3151 | emit_insn (gen_rtx_CLOBBER (VOIDmode, stack_pointer_rtx)); |
7393c642 | 3152 | emit_move_insn (virtual_stack_dynamic_rtx, stack_pointer_rtx); |
7393c642 RK |
3153 | } |
3154 | ||
d9725c41 JJ |
3155 | if (stack_usage_map_buf) |
3156 | free (stack_usage_map_buf); | |
3157 | ||
51bbfa0c RS |
3158 | return target; |
3159 | } | |
ded9bf77 | 3160 | |
6de9cd9a DN |
3161 | /* A sibling call sequence invalidates any REG_EQUIV notes made for |
3162 | this function's incoming arguments. | |
3163 | ||
3164 | At the start of RTL generation we know the only REG_EQUIV notes | |
29d51cdb SB |
3165 | in the rtl chain are those for incoming arguments, so we can look |
3166 | for REG_EQUIV notes between the start of the function and the | |
3167 | NOTE_INSN_FUNCTION_BEG. | |
6de9cd9a DN |
3168 | |
3169 | This is (slight) overkill. We could keep track of the highest | |
3170 | argument we clobber and be more selective in removing notes, but it | |
3171 | does not seem to be worth the effort. */ | |
29d51cdb | 3172 | |
6de9cd9a DN |
3173 | void |
3174 | fixup_tail_calls (void) | |
3175 | { | |
29d51cdb SB |
3176 | rtx insn; |
3177 | ||
3178 | for (insn = get_insns (); insn; insn = NEXT_INSN (insn)) | |
3179 | { | |
a31830a7 SB |
3180 | rtx note; |
3181 | ||
29d51cdb SB |
3182 | /* There are never REG_EQUIV notes for the incoming arguments |
3183 | after the NOTE_INSN_FUNCTION_BEG note, so stop if we see it. */ | |
3184 | if (NOTE_P (insn) | |
3185 | && NOTE_LINE_NUMBER (insn) == NOTE_INSN_FUNCTION_BEG) | |
3186 | break; | |
3187 | ||
a31830a7 SB |
3188 | note = find_reg_note (insn, REG_EQUIV, 0); |
3189 | if (note) | |
3190 | remove_note (insn, note); | |
3191 | note = find_reg_note (insn, REG_EQUIV, 0); | |
3192 | gcc_assert (!note); | |
29d51cdb | 3193 | } |
6de9cd9a DN |
3194 | } |
3195 | ||
ded9bf77 AH |
3196 | /* Traverse a list of TYPES and expand all complex types into their |
3197 | components. */ | |
2f2b4a02 | 3198 | static tree |
ded9bf77 AH |
3199 | split_complex_types (tree types) |
3200 | { | |
3201 | tree p; | |
3202 | ||
42ba5130 RH |
3203 | /* Before allocating memory, check for the common case of no complex. */ |
3204 | for (p = types; p; p = TREE_CHAIN (p)) | |
3205 | { | |
3206 | tree type = TREE_VALUE (p); | |
3207 | if (TREE_CODE (type) == COMPLEX_TYPE | |
3208 | && targetm.calls.split_complex_arg (type)) | |
c22cacf3 | 3209 | goto found; |
42ba5130 RH |
3210 | } |
3211 | return types; | |
3212 | ||
3213 | found: | |
ded9bf77 AH |
3214 | types = copy_list (types); |
3215 | ||
3216 | for (p = types; p; p = TREE_CHAIN (p)) | |
3217 | { | |
3218 | tree complex_type = TREE_VALUE (p); | |
3219 | ||
42ba5130 RH |
3220 | if (TREE_CODE (complex_type) == COMPLEX_TYPE |
3221 | && targetm.calls.split_complex_arg (complex_type)) | |
ded9bf77 AH |
3222 | { |
3223 | tree next, imag; | |
3224 | ||
3225 | /* Rewrite complex type with component type. */ | |
3226 | TREE_VALUE (p) = TREE_TYPE (complex_type); | |
3227 | next = TREE_CHAIN (p); | |
3228 | ||
3229 | /* Add another component type for the imaginary part. */ | |
3230 | imag = build_tree_list (NULL_TREE, TREE_VALUE (p)); | |
3231 | TREE_CHAIN (p) = imag; | |
3232 | TREE_CHAIN (imag) = next; | |
3233 | ||
3234 | /* Skip the newly created node. */ | |
3235 | p = TREE_CHAIN (p); | |
3236 | } | |
3237 | } | |
3238 | ||
3239 | return types; | |
3240 | } | |
51bbfa0c | 3241 | \f |
de76b467 | 3242 | /* Output a library call to function FUN (a SYMBOL_REF rtx). |
f725a3ec | 3243 | The RETVAL parameter specifies whether return value needs to be saved, other |
0407c02b | 3244 | parameters are documented in the emit_library_call function below. */ |
8ac61af7 | 3245 | |
de76b467 | 3246 | static rtx |
d329e058 AJ |
3247 | emit_library_call_value_1 (int retval, rtx orgfun, rtx value, |
3248 | enum libcall_type fn_type, | |
3249 | enum machine_mode outmode, int nargs, va_list p) | |
43bc5f13 | 3250 | { |
3c0fca12 RH |
3251 | /* Total size in bytes of all the stack-parms scanned so far. */ |
3252 | struct args_size args_size; | |
3253 | /* Size of arguments before any adjustments (such as rounding). */ | |
3254 | struct args_size original_args_size; | |
b3694847 | 3255 | int argnum; |
3c0fca12 RH |
3256 | rtx fun; |
3257 | int inc; | |
3258 | int count; | |
3c0fca12 RH |
3259 | rtx argblock = 0; |
3260 | CUMULATIVE_ARGS args_so_far; | |
f725a3ec KH |
3261 | struct arg |
3262 | { | |
3263 | rtx value; | |
3264 | enum machine_mode mode; | |
3265 | rtx reg; | |
3266 | int partial; | |
e7949876 | 3267 | struct locate_and_pad_arg_data locate; |
f725a3ec KH |
3268 | rtx save_area; |
3269 | }; | |
3c0fca12 RH |
3270 | struct arg *argvec; |
3271 | int old_inhibit_defer_pop = inhibit_defer_pop; | |
3272 | rtx call_fusage = 0; | |
3273 | rtx mem_value = 0; | |
5591ee6f | 3274 | rtx valreg; |
3c0fca12 RH |
3275 | int pcc_struct_value = 0; |
3276 | int struct_value_size = 0; | |
52a11cbf | 3277 | int flags; |
3c0fca12 | 3278 | int reg_parm_stack_space = 0; |
3c0fca12 | 3279 | int needed; |
695ee791 | 3280 | rtx before_call; |
b0c48229 | 3281 | tree tfom; /* type_for_mode (outmode, 0) */ |
3c0fca12 | 3282 | |
f73ad30e | 3283 | #ifdef REG_PARM_STACK_SPACE |
3c0fca12 RH |
3284 | /* Define the boundary of the register parm stack space that needs to be |
3285 | save, if any. */ | |
b820d2b8 | 3286 | int low_to_save, high_to_save; |
f725a3ec | 3287 | rtx save_area = 0; /* Place that it is saved. */ |
3c0fca12 RH |
3288 | #endif |
3289 | ||
3c0fca12 RH |
3290 | /* Size of the stack reserved for parameter registers. */ |
3291 | int initial_highest_arg_in_use = highest_outgoing_arg_in_use; | |
3292 | char *initial_stack_usage_map = stack_usage_map; | |
d9725c41 | 3293 | char *stack_usage_map_buf = NULL; |
3c0fca12 | 3294 | |
61f71b34 DD |
3295 | rtx struct_value = targetm.calls.struct_value_rtx (0, 0); |
3296 | ||
3c0fca12 | 3297 | #ifdef REG_PARM_STACK_SPACE |
3c0fca12 | 3298 | reg_parm_stack_space = REG_PARM_STACK_SPACE ((tree) 0); |
3c0fca12 RH |
3299 | #endif |
3300 | ||
9555a122 | 3301 | /* By default, library functions can not throw. */ |
52a11cbf RH |
3302 | flags = ECF_NOTHROW; |
3303 | ||
9555a122 RH |
3304 | switch (fn_type) |
3305 | { | |
3306 | case LCT_NORMAL: | |
53d4257f | 3307 | break; |
9555a122 | 3308 | case LCT_CONST: |
53d4257f JH |
3309 | flags |= ECF_CONST; |
3310 | break; | |
9555a122 | 3311 | case LCT_PURE: |
53d4257f | 3312 | flags |= ECF_PURE; |
9555a122 RH |
3313 | break; |
3314 | case LCT_CONST_MAKE_BLOCK: | |
53d4257f | 3315 | flags |= ECF_CONST | ECF_LIBCALL_BLOCK; |
9555a122 RH |
3316 | break; |
3317 | case LCT_PURE_MAKE_BLOCK: | |
53d4257f | 3318 | flags |= ECF_PURE | ECF_LIBCALL_BLOCK; |
9555a122 RH |
3319 | break; |
3320 | case LCT_NORETURN: | |
3321 | flags |= ECF_NORETURN; | |
3322 | break; | |
3323 | case LCT_THROW: | |
3324 | flags = ECF_NORETURN; | |
3325 | break; | |
9defc9b7 RH |
3326 | case LCT_RETURNS_TWICE: |
3327 | flags = ECF_RETURNS_TWICE; | |
3328 | break; | |
9555a122 | 3329 | } |
3c0fca12 RH |
3330 | fun = orgfun; |
3331 | ||
3c0fca12 RH |
3332 | /* Ensure current function's preferred stack boundary is at least |
3333 | what we need. */ | |
3334 | if (cfun->preferred_stack_boundary < PREFERRED_STACK_BOUNDARY) | |
3335 | cfun->preferred_stack_boundary = PREFERRED_STACK_BOUNDARY; | |
3c0fca12 RH |
3336 | |
3337 | /* If this kind of value comes back in memory, | |
3338 | decide where in memory it should come back. */ | |
b0c48229 | 3339 | if (outmode != VOIDmode) |
3c0fca12 | 3340 | { |
ae2bcd98 | 3341 | tfom = lang_hooks.types.type_for_mode (outmode, 0); |
61f71b34 | 3342 | if (aggregate_value_p (tfom, 0)) |
b0c48229 | 3343 | { |
3c0fca12 | 3344 | #ifdef PCC_STATIC_STRUCT_RETURN |
b0c48229 | 3345 | rtx pointer_reg |
1d636cc6 | 3346 | = hard_function_value (build_pointer_type (tfom), 0, 0, 0); |
b0c48229 NB |
3347 | mem_value = gen_rtx_MEM (outmode, pointer_reg); |
3348 | pcc_struct_value = 1; | |
3349 | if (value == 0) | |
3350 | value = gen_reg_rtx (outmode); | |
3c0fca12 | 3351 | #else /* not PCC_STATIC_STRUCT_RETURN */ |
b0c48229 | 3352 | struct_value_size = GET_MODE_SIZE (outmode); |
3c0cb5de | 3353 | if (value != 0 && MEM_P (value)) |
b0c48229 NB |
3354 | mem_value = value; |
3355 | else | |
3356 | mem_value = assign_temp (tfom, 0, 1, 1); | |
3c0fca12 | 3357 | #endif |
b0c48229 NB |
3358 | /* This call returns a big structure. */ |
3359 | flags &= ~(ECF_CONST | ECF_PURE | ECF_LIBCALL_BLOCK); | |
3360 | } | |
3c0fca12 | 3361 | } |
b0c48229 NB |
3362 | else |
3363 | tfom = void_type_node; | |
3c0fca12 RH |
3364 | |
3365 | /* ??? Unfinished: must pass the memory address as an argument. */ | |
3366 | ||
3367 | /* Copy all the libcall-arguments out of the varargs data | |
3368 | and into a vector ARGVEC. | |
3369 | ||
3370 | Compute how to pass each argument. We only support a very small subset | |
3371 | of the full argument passing conventions to limit complexity here since | |
3372 | library functions shouldn't have many args. */ | |
3373 | ||
703ad42b KG |
3374 | argvec = alloca ((nargs + 1) * sizeof (struct arg)); |
3375 | memset (argvec, 0, (nargs + 1) * sizeof (struct arg)); | |
3c0fca12 | 3376 | |
97fc4caf AO |
3377 | #ifdef INIT_CUMULATIVE_LIBCALL_ARGS |
3378 | INIT_CUMULATIVE_LIBCALL_ARGS (args_so_far, outmode, fun); | |
3379 | #else | |
0f6937fe | 3380 | INIT_CUMULATIVE_ARGS (args_so_far, NULL_TREE, fun, 0, nargs); |
97fc4caf | 3381 | #endif |
3c0fca12 RH |
3382 | |
3383 | args_size.constant = 0; | |
3384 | args_size.var = 0; | |
3385 | ||
3386 | count = 0; | |
3387 | ||
ebb1b59a BS |
3388 | /* Now we are about to start emitting insns that can be deleted |
3389 | if a libcall is deleted. */ | |
53d4257f | 3390 | if (flags & ECF_LIBCALL_BLOCK) |
ebb1b59a BS |
3391 | start_sequence (); |
3392 | ||
3c0fca12 RH |
3393 | push_temp_slots (); |
3394 | ||
3395 | /* If there's a structure value address to be passed, | |
3396 | either pass it in the special place, or pass it as an extra argument. */ | |
61f71b34 | 3397 | if (mem_value && struct_value == 0 && ! pcc_struct_value) |
3c0fca12 RH |
3398 | { |
3399 | rtx addr = XEXP (mem_value, 0); | |
c22cacf3 | 3400 | |
3c0fca12 RH |
3401 | nargs++; |
3402 | ||
3403 | /* Make sure it is a reasonable operand for a move or push insn. */ | |
3c0cb5de | 3404 | if (!REG_P (addr) && !MEM_P (addr) |
3c0fca12 RH |
3405 | && ! (CONSTANT_P (addr) && LEGITIMATE_CONSTANT_P (addr))) |
3406 | addr = force_operand (addr, NULL_RTX); | |
3407 | ||
3408 | argvec[count].value = addr; | |
3409 | argvec[count].mode = Pmode; | |
3410 | argvec[count].partial = 0; | |
3411 | ||
3412 | argvec[count].reg = FUNCTION_ARG (args_so_far, Pmode, NULL_TREE, 1); | |
78a52f11 RH |
3413 | gcc_assert (targetm.calls.arg_partial_bytes (&args_so_far, Pmode, |
3414 | NULL_TREE, 1) == 0); | |
3c0fca12 RH |
3415 | |
3416 | locate_and_pad_parm (Pmode, NULL_TREE, | |
a4d5044f | 3417 | #ifdef STACK_PARMS_IN_REG_PARM_AREA |
c22cacf3 | 3418 | 1, |
a4d5044f CM |
3419 | #else |
3420 | argvec[count].reg != 0, | |
3421 | #endif | |
e7949876 | 3422 | 0, NULL_TREE, &args_size, &argvec[count].locate); |
3c0fca12 | 3423 | |
3c0fca12 RH |
3424 | if (argvec[count].reg == 0 || argvec[count].partial != 0 |
3425 | || reg_parm_stack_space > 0) | |
e7949876 | 3426 | args_size.constant += argvec[count].locate.size.constant; |
3c0fca12 RH |
3427 | |
3428 | FUNCTION_ARG_ADVANCE (args_so_far, Pmode, (tree) 0, 1); | |
3429 | ||
3430 | count++; | |
3431 | } | |
3432 | ||
3433 | for (; count < nargs; count++) | |
3434 | { | |
3435 | rtx val = va_arg (p, rtx); | |
3436 | enum machine_mode mode = va_arg (p, enum machine_mode); | |
3437 | ||
3438 | /* We cannot convert the arg value to the mode the library wants here; | |
3439 | must do it earlier where we know the signedness of the arg. */ | |
366de0ce NS |
3440 | gcc_assert (mode != BLKmode |
3441 | && (GET_MODE (val) == mode || GET_MODE (val) == VOIDmode)); | |
3c0fca12 | 3442 | |
3c0fca12 | 3443 | /* Make sure it is a reasonable operand for a move or push insn. */ |
3c0cb5de | 3444 | if (!REG_P (val) && !MEM_P (val) |
3c0fca12 RH |
3445 | && ! (CONSTANT_P (val) && LEGITIMATE_CONSTANT_P (val))) |
3446 | val = force_operand (val, NULL_RTX); | |
3447 | ||
0976078c | 3448 | if (pass_by_reference (&args_so_far, mode, NULL_TREE, 1)) |
3c0fca12 | 3449 | { |
f474c6f8 | 3450 | rtx slot; |
6cdd5672 RH |
3451 | int must_copy |
3452 | = !reference_callee_copied (&args_so_far, mode, NULL_TREE, 1); | |
f474c6f8 | 3453 | |
a0dc500c R |
3454 | /* loop.c won't look at CALL_INSN_FUNCTION_USAGE of const/pure |
3455 | functions, so we have to pretend this isn't such a function. */ | |
3456 | if (flags & ECF_LIBCALL_BLOCK) | |
3457 | { | |
3458 | rtx insns = get_insns (); | |
3459 | end_sequence (); | |
3460 | emit_insn (insns); | |
3461 | } | |
3462 | flags &= ~(ECF_CONST | ECF_PURE | ECF_LIBCALL_BLOCK); | |
3463 | ||
99a32567 DM |
3464 | /* If this was a CONST function, it is now PURE since |
3465 | it now reads memory. */ | |
3466 | if (flags & ECF_CONST) | |
3467 | { | |
3468 | flags &= ~ECF_CONST; | |
3469 | flags |= ECF_PURE; | |
3470 | } | |
3471 | ||
9969aaf6 | 3472 | if (GET_MODE (val) == MEM && !must_copy) |
f474c6f8 | 3473 | slot = val; |
9969aaf6 | 3474 | else |
f474c6f8 | 3475 | { |
ae2bcd98 | 3476 | slot = assign_temp (lang_hooks.types.type_for_mode (mode, 0), |
b0c48229 | 3477 | 0, 1, 1); |
f474c6f8 AO |
3478 | emit_move_insn (slot, val); |
3479 | } | |
1da68f56 | 3480 | |
6b5273c3 AO |
3481 | call_fusage = gen_rtx_EXPR_LIST (VOIDmode, |
3482 | gen_rtx_USE (VOIDmode, slot), | |
3483 | call_fusage); | |
f474c6f8 AO |
3484 | if (must_copy) |
3485 | call_fusage = gen_rtx_EXPR_LIST (VOIDmode, | |
3486 | gen_rtx_CLOBBER (VOIDmode, | |
3487 | slot), | |
3488 | call_fusage); | |
3489 | ||
3c0fca12 | 3490 | mode = Pmode; |
f474c6f8 | 3491 | val = force_operand (XEXP (slot, 0), NULL_RTX); |
3c0fca12 | 3492 | } |
3c0fca12 RH |
3493 | |
3494 | argvec[count].value = val; | |
3495 | argvec[count].mode = mode; | |
3496 | ||
3497 | argvec[count].reg = FUNCTION_ARG (args_so_far, mode, NULL_TREE, 1); | |
3498 | ||
3c0fca12 | 3499 | argvec[count].partial |
78a52f11 | 3500 | = targetm.calls.arg_partial_bytes (&args_so_far, mode, NULL_TREE, 1); |
3c0fca12 RH |
3501 | |
3502 | locate_and_pad_parm (mode, NULL_TREE, | |
a4d5044f | 3503 | #ifdef STACK_PARMS_IN_REG_PARM_AREA |
f725a3ec | 3504 | 1, |
a4d5044f CM |
3505 | #else |
3506 | argvec[count].reg != 0, | |
3507 | #endif | |
e7949876 AM |
3508 | argvec[count].partial, |
3509 | NULL_TREE, &args_size, &argvec[count].locate); | |
3c0fca12 | 3510 | |
366de0ce | 3511 | gcc_assert (!argvec[count].locate.size.var); |
3c0fca12 | 3512 | |
3c0fca12 RH |
3513 | if (argvec[count].reg == 0 || argvec[count].partial != 0 |
3514 | || reg_parm_stack_space > 0) | |
e7949876 | 3515 | args_size.constant += argvec[count].locate.size.constant; |
3c0fca12 RH |
3516 | |
3517 | FUNCTION_ARG_ADVANCE (args_so_far, mode, (tree) 0, 1); | |
3518 | } | |
3c0fca12 | 3519 | |
3c0fca12 RH |
3520 | /* If this machine requires an external definition for library |
3521 | functions, write one out. */ | |
3522 | assemble_external_libcall (fun); | |
3523 | ||
3524 | original_args_size = args_size; | |
1503a7ec JH |
3525 | args_size.constant = (((args_size.constant |
3526 | + stack_pointer_delta | |
3527 | + STACK_BYTES - 1) | |
3528 | / STACK_BYTES | |
3529 | * STACK_BYTES) | |
3530 | - stack_pointer_delta); | |
3c0fca12 RH |
3531 | |
3532 | args_size.constant = MAX (args_size.constant, | |
3533 | reg_parm_stack_space); | |
3534 | ||
3535 | #ifndef OUTGOING_REG_PARM_STACK_SPACE | |
3536 | args_size.constant -= reg_parm_stack_space; | |
3537 | #endif | |
3538 | ||
3539 | if (args_size.constant > current_function_outgoing_args_size) | |
3540 | current_function_outgoing_args_size = args_size.constant; | |
3541 | ||
f73ad30e JH |
3542 | if (ACCUMULATE_OUTGOING_ARGS) |
3543 | { | |
3544 | /* Since the stack pointer will never be pushed, it is possible for | |
3545 | the evaluation of a parm to clobber something we have already | |
3546 | written to the stack. Since most function calls on RISC machines | |
3547 | do not use the stack, this is uncommon, but must work correctly. | |
3c0fca12 | 3548 | |
f73ad30e JH |
3549 | Therefore, we save any area of the stack that was already written |
3550 | and that we are using. Here we set up to do this by making a new | |
3551 | stack usage map from the old one. | |
3c0fca12 | 3552 | |
f73ad30e JH |
3553 | Another approach might be to try to reorder the argument |
3554 | evaluations to avoid this conflicting stack usage. */ | |
3c0fca12 | 3555 | |
f73ad30e | 3556 | needed = args_size.constant; |
3c0fca12 RH |
3557 | |
3558 | #ifndef OUTGOING_REG_PARM_STACK_SPACE | |
f73ad30e JH |
3559 | /* Since we will be writing into the entire argument area, the |
3560 | map must be allocated for its entire size, not just the part that | |
3561 | is the responsibility of the caller. */ | |
3562 | needed += reg_parm_stack_space; | |
3c0fca12 RH |
3563 | #endif |
3564 | ||
3565 | #ifdef ARGS_GROW_DOWNWARD | |
f73ad30e JH |
3566 | highest_outgoing_arg_in_use = MAX (initial_highest_arg_in_use, |
3567 | needed + 1); | |
3c0fca12 | 3568 | #else |
f73ad30e JH |
3569 | highest_outgoing_arg_in_use = MAX (initial_highest_arg_in_use, |
3570 | needed); | |
3c0fca12 | 3571 | #endif |
5ed6ace5 | 3572 | stack_usage_map_buf = XNEWVEC (char, highest_outgoing_arg_in_use); |
d9725c41 | 3573 | stack_usage_map = stack_usage_map_buf; |
3c0fca12 | 3574 | |
f73ad30e | 3575 | if (initial_highest_arg_in_use) |
2e09e75a JM |
3576 | memcpy (stack_usage_map, initial_stack_usage_map, |
3577 | initial_highest_arg_in_use); | |
3c0fca12 | 3578 | |
f73ad30e | 3579 | if (initial_highest_arg_in_use != highest_outgoing_arg_in_use) |
961192e1 | 3580 | memset (&stack_usage_map[initial_highest_arg_in_use], 0, |
f73ad30e JH |
3581 | highest_outgoing_arg_in_use - initial_highest_arg_in_use); |
3582 | needed = 0; | |
3c0fca12 | 3583 | |
c39ada04 | 3584 | /* We must be careful to use virtual regs before they're instantiated, |
c22cacf3 | 3585 | and real regs afterwards. Loop optimization, for example, can create |
c39ada04 DD |
3586 | new libcalls after we've instantiated the virtual regs, and if we |
3587 | use virtuals anyway, they won't match the rtl patterns. */ | |
3c0fca12 | 3588 | |
c39ada04 DD |
3589 | if (virtuals_instantiated) |
3590 | argblock = plus_constant (stack_pointer_rtx, STACK_POINTER_OFFSET); | |
3591 | else | |
3592 | argblock = virtual_outgoing_args_rtx; | |
f73ad30e JH |
3593 | } |
3594 | else | |
3595 | { | |
3596 | if (!PUSH_ARGS) | |
3597 | argblock = push_block (GEN_INT (args_size.constant), 0, 0); | |
3598 | } | |
3c0fca12 | 3599 | |
3c0fca12 RH |
3600 | /* If we push args individually in reverse order, perform stack alignment |
3601 | before the first push (the last arg). */ | |
f73ad30e | 3602 | if (argblock == 0 && PUSH_ARGS_REVERSED) |
3c0fca12 RH |
3603 | anti_adjust_stack (GEN_INT (args_size.constant |
3604 | - original_args_size.constant)); | |
3c0fca12 | 3605 | |
f73ad30e JH |
3606 | if (PUSH_ARGS_REVERSED) |
3607 | { | |
3608 | inc = -1; | |
3609 | argnum = nargs - 1; | |
3610 | } | |
3611 | else | |
3612 | { | |
3613 | inc = 1; | |
3614 | argnum = 0; | |
3615 | } | |
3c0fca12 | 3616 | |
f73ad30e JH |
3617 | #ifdef REG_PARM_STACK_SPACE |
3618 | if (ACCUMULATE_OUTGOING_ARGS) | |
3619 | { | |
3620 | /* The argument list is the property of the called routine and it | |
3621 | may clobber it. If the fixed area has been used for previous | |
b820d2b8 AM |
3622 | parameters, we must save and restore it. */ |
3623 | save_area = save_fixed_argument_area (reg_parm_stack_space, argblock, | |
3624 | &low_to_save, &high_to_save); | |
3c0fca12 RH |
3625 | } |
3626 | #endif | |
f725a3ec | 3627 | |
3c0fca12 RH |
3628 | /* Push the args that need to be pushed. */ |
3629 | ||
3630 | /* ARGNUM indexes the ARGVEC array in the order in which the arguments | |
3631 | are to be pushed. */ | |
3632 | for (count = 0; count < nargs; count++, argnum += inc) | |
3633 | { | |
b3694847 SS |
3634 | enum machine_mode mode = argvec[argnum].mode; |
3635 | rtx val = argvec[argnum].value; | |
3c0fca12 RH |
3636 | rtx reg = argvec[argnum].reg; |
3637 | int partial = argvec[argnum].partial; | |
f73ad30e | 3638 | int lower_bound = 0, upper_bound = 0, i; |
3c0fca12 RH |
3639 | |
3640 | if (! (reg != 0 && partial == 0)) | |
3641 | { | |
f73ad30e JH |
3642 | if (ACCUMULATE_OUTGOING_ARGS) |
3643 | { | |
f8a097cd JH |
3644 | /* If this is being stored into a pre-allocated, fixed-size, |
3645 | stack area, save any previous data at that location. */ | |
3c0fca12 RH |
3646 | |
3647 | #ifdef ARGS_GROW_DOWNWARD | |
f73ad30e JH |
3648 | /* stack_slot is negative, but we want to index stack_usage_map |
3649 | with positive values. */ | |
e7949876 AM |
3650 | upper_bound = -argvec[argnum].locate.offset.constant + 1; |
3651 | lower_bound = upper_bound - argvec[argnum].locate.size.constant; | |
3c0fca12 | 3652 | #else |
e7949876 AM |
3653 | lower_bound = argvec[argnum].locate.offset.constant; |
3654 | upper_bound = lower_bound + argvec[argnum].locate.size.constant; | |
3c0fca12 RH |
3655 | #endif |
3656 | ||
546ff777 AM |
3657 | i = lower_bound; |
3658 | /* Don't worry about things in the fixed argument area; | |
3659 | it has already been saved. */ | |
3660 | if (i < reg_parm_stack_space) | |
3661 | i = reg_parm_stack_space; | |
3662 | while (i < upper_bound && stack_usage_map[i] == 0) | |
3663 | i++; | |
3c0fca12 | 3664 | |
546ff777 | 3665 | if (i < upper_bound) |
f73ad30e | 3666 | { |
e7949876 AM |
3667 | /* We need to make a save area. */ |
3668 | unsigned int size | |
3669 | = argvec[argnum].locate.size.constant * BITS_PER_UNIT; | |
f73ad30e | 3670 | enum machine_mode save_mode |
e7949876 AM |
3671 | = mode_for_size (size, MODE_INT, 1); |
3672 | rtx adr | |
3673 | = plus_constant (argblock, | |
3674 | argvec[argnum].locate.offset.constant); | |
f73ad30e | 3675 | rtx stack_area |
e7949876 | 3676 | = gen_rtx_MEM (save_mode, memory_address (save_mode, adr)); |
f73ad30e | 3677 | |
9778f2f8 JH |
3678 | if (save_mode == BLKmode) |
3679 | { | |
3680 | argvec[argnum].save_area | |
3681 | = assign_stack_temp (BLKmode, | |
c22cacf3 | 3682 | argvec[argnum].locate.size.constant, |
9778f2f8 JH |
3683 | 0); |
3684 | ||
3685 | emit_block_move (validize_mem (argvec[argnum].save_area), | |
c22cacf3 | 3686 | stack_area, |
9778f2f8 JH |
3687 | GEN_INT (argvec[argnum].locate.size.constant), |
3688 | BLOCK_OP_CALL_PARM); | |
3689 | } | |
3690 | else | |
3691 | { | |
3692 | argvec[argnum].save_area = gen_reg_rtx (save_mode); | |
3693 | ||
3694 | emit_move_insn (argvec[argnum].save_area, stack_area); | |
3695 | } | |
f73ad30e | 3696 | } |
3c0fca12 | 3697 | } |
19caa751 | 3698 | |
44bb111a RH |
3699 | emit_push_insn (val, mode, NULL_TREE, NULL_RTX, PARM_BOUNDARY, |
3700 | partial, reg, 0, argblock, | |
e7949876 AM |
3701 | GEN_INT (argvec[argnum].locate.offset.constant), |
3702 | reg_parm_stack_space, | |
3703 | ARGS_SIZE_RTX (argvec[argnum].locate.alignment_pad)); | |
3c0fca12 | 3704 | |
3c0fca12 | 3705 | /* Now mark the segment we just used. */ |
f73ad30e JH |
3706 | if (ACCUMULATE_OUTGOING_ARGS) |
3707 | for (i = lower_bound; i < upper_bound; i++) | |
3708 | stack_usage_map[i] = 1; | |
3c0fca12 RH |
3709 | |
3710 | NO_DEFER_POP; | |
475a3eef R |
3711 | |
3712 | if (flags & ECF_CONST) | |
3713 | { | |
3714 | rtx use; | |
3715 | ||
3716 | /* Indicate argument access so that alias.c knows that these | |
3717 | values are live. */ | |
3718 | if (argblock) | |
3719 | use = plus_constant (argblock, | |
3720 | argvec[argnum].locate.offset.constant); | |
3721 | else | |
a4174ebf | 3722 | /* When arguments are pushed, trying to tell alias.c where |
475a3eef R |
3723 | exactly this argument is won't work, because the |
3724 | auto-increment causes confusion. So we merely indicate | |
3725 | that we access something with a known mode somewhere on | |
3726 | the stack. */ | |
c22cacf3 | 3727 | use = gen_rtx_PLUS (Pmode, virtual_outgoing_args_rtx, |
475a3eef R |
3728 | gen_rtx_SCRATCH (Pmode)); |
3729 | use = gen_rtx_MEM (argvec[argnum].mode, use); | |
3730 | use = gen_rtx_USE (VOIDmode, use); | |
3731 | call_fusage = gen_rtx_EXPR_LIST (VOIDmode, use, call_fusage); | |
3732 | } | |
3c0fca12 RH |
3733 | } |
3734 | } | |
3735 | ||
3c0fca12 RH |
3736 | /* If we pushed args in forward order, perform stack alignment |
3737 | after pushing the last arg. */ | |
f73ad30e | 3738 | if (argblock == 0 && !PUSH_ARGS_REVERSED) |
3c0fca12 RH |
3739 | anti_adjust_stack (GEN_INT (args_size.constant |
3740 | - original_args_size.constant)); | |
3c0fca12 | 3741 | |
f73ad30e JH |
3742 | if (PUSH_ARGS_REVERSED) |
3743 | argnum = nargs - 1; | |
3744 | else | |
3745 | argnum = 0; | |
3c0fca12 | 3746 | |
6de9cd9a | 3747 | fun = prepare_call_address (fun, NULL, &call_fusage, 0, 0); |
3c0fca12 RH |
3748 | |
3749 | /* Now load any reg parms into their regs. */ | |
3750 | ||
3751 | /* ARGNUM indexes the ARGVEC array in the order in which the arguments | |
3752 | are to be pushed. */ | |
3753 | for (count = 0; count < nargs; count++, argnum += inc) | |
3754 | { | |
ff15c351 | 3755 | enum machine_mode mode = argvec[argnum].mode; |
b3694847 | 3756 | rtx val = argvec[argnum].value; |
3c0fca12 RH |
3757 | rtx reg = argvec[argnum].reg; |
3758 | int partial = argvec[argnum].partial; | |
3759 | ||
3760 | /* Handle calls that pass values in multiple non-contiguous | |
3761 | locations. The PA64 has examples of this for library calls. */ | |
3762 | if (reg != 0 && GET_CODE (reg) == PARALLEL) | |
ff15c351 | 3763 | emit_group_load (reg, val, NULL_TREE, GET_MODE_SIZE (mode)); |
3c0fca12 RH |
3764 | else if (reg != 0 && partial == 0) |
3765 | emit_move_insn (reg, val); | |
3766 | ||
3767 | NO_DEFER_POP; | |
3768 | } | |
3769 | ||
3c0fca12 RH |
3770 | /* Any regs containing parms remain in use through the call. */ |
3771 | for (count = 0; count < nargs; count++) | |
3772 | { | |
3773 | rtx reg = argvec[count].reg; | |
3774 | if (reg != 0 && GET_CODE (reg) == PARALLEL) | |
3775 | use_group_regs (&call_fusage, reg); | |
3776 | else if (reg != 0) | |
3777 | use_reg (&call_fusage, reg); | |
3778 | } | |
3779 | ||
3780 | /* Pass the function the address in which to return a structure value. */ | |
61f71b34 | 3781 | if (mem_value != 0 && struct_value != 0 && ! pcc_struct_value) |
3c0fca12 | 3782 | { |
61f71b34 | 3783 | emit_move_insn (struct_value, |
3c0fca12 RH |
3784 | force_reg (Pmode, |
3785 | force_operand (XEXP (mem_value, 0), | |
3786 | NULL_RTX))); | |
f8cfc6aa | 3787 | if (REG_P (struct_value)) |
61f71b34 | 3788 | use_reg (&call_fusage, struct_value); |
3c0fca12 RH |
3789 | } |
3790 | ||
3791 | /* Don't allow popping to be deferred, since then | |
3792 | cse'ing of library calls could delete a call and leave the pop. */ | |
3793 | NO_DEFER_POP; | |
5591ee6f JH |
3794 | valreg = (mem_value == 0 && outmode != VOIDmode |
3795 | ? hard_libcall_value (outmode) : NULL_RTX); | |
3c0fca12 | 3796 | |
ce48579b | 3797 | /* Stack must be properly aligned now. */ |
366de0ce NS |
3798 | gcc_assert (!(stack_pointer_delta |
3799 | & (PREFERRED_STACK_BOUNDARY / BITS_PER_UNIT - 1))); | |
ebcd0b57 | 3800 | |
695ee791 RH |
3801 | before_call = get_last_insn (); |
3802 | ||
3c0fca12 RH |
3803 | /* We pass the old value of inhibit_defer_pop + 1 to emit_call_1, which |
3804 | will set inhibit_defer_pop to that value. */ | |
de76b467 JH |
3805 | /* The return type is needed to decide how many bytes the function pops. |
3806 | Signedness plays no role in that, so for simplicity, we pretend it's | |
3807 | always signed. We also assume that the list of arguments passed has | |
3808 | no impact, so we pretend it is unknown. */ | |
3c0fca12 | 3809 | |
6de9cd9a | 3810 | emit_call_1 (fun, NULL, |
f725a3ec | 3811 | get_identifier (XSTR (orgfun, 0)), |
b0c48229 | 3812 | build_function_type (tfom, NULL_TREE), |
f725a3ec | 3813 | original_args_size.constant, args_size.constant, |
3c0fca12 RH |
3814 | struct_value_size, |
3815 | FUNCTION_ARG (args_so_far, VOIDmode, void_type_node, 1), | |
5591ee6f | 3816 | valreg, |
fa5322fa | 3817 | old_inhibit_defer_pop + 1, call_fusage, flags, & args_so_far); |
3c0fca12 | 3818 | |
695ee791 RH |
3819 | /* For calls to `setjmp', etc., inform flow.c it should complain |
3820 | if nonvolatile values are live. For functions that cannot return, | |
3821 | inform flow that control does not fall through. */ | |
3822 | ||
6e14af16 | 3823 | if (flags & ECF_NORETURN) |
695ee791 | 3824 | { |
570a98eb | 3825 | /* The barrier note must be emitted |
695ee791 RH |
3826 | immediately after the CALL_INSN. Some ports emit more than |
3827 | just a CALL_INSN above, so we must search for it here. */ | |
3828 | ||
3829 | rtx last = get_last_insn (); | |
4b4bf941 | 3830 | while (!CALL_P (last)) |
695ee791 RH |
3831 | { |
3832 | last = PREV_INSN (last); | |
3833 | /* There was no CALL_INSN? */ | |
366de0ce | 3834 | gcc_assert (last != before_call); |
695ee791 RH |
3835 | } |
3836 | ||
570a98eb | 3837 | emit_barrier_after (last); |
695ee791 RH |
3838 | } |
3839 | ||
3c0fca12 RH |
3840 | /* Now restore inhibit_defer_pop to its actual original value. */ |
3841 | OK_DEFER_POP; | |
3842 | ||
ebb1b59a BS |
3843 | /* If call is cse'able, make appropriate pair of reg-notes around it. |
3844 | Test valreg so we don't crash; may safely ignore `const' | |
3845 | if return type is void. Disable for PARALLEL return values, because | |
3846 | we have no way to move such values into a pseudo register. */ | |
53d4257f | 3847 | if (flags & ECF_LIBCALL_BLOCK) |
ebb1b59a | 3848 | { |
ebb1b59a | 3849 | rtx insns; |
ebb1b59a | 3850 | |
c3297561 | 3851 | if (valreg == 0) |
e4abc3d5 RH |
3852 | { |
3853 | insns = get_insns (); | |
3854 | end_sequence (); | |
2f937369 | 3855 | emit_insn (insns); |
e4abc3d5 RH |
3856 | } |
3857 | else | |
3858 | { | |
3859 | rtx note = 0; | |
c3297561 | 3860 | rtx temp; |
e4abc3d5 | 3861 | int i; |
ebb1b59a | 3862 | |
c3297561 AO |
3863 | if (GET_CODE (valreg) == PARALLEL) |
3864 | { | |
3865 | temp = gen_reg_rtx (outmode); | |
7ae4ad28 | 3866 | emit_group_store (temp, valreg, NULL_TREE, |
643642eb | 3867 | GET_MODE_SIZE (outmode)); |
c3297561 AO |
3868 | valreg = temp; |
3869 | } | |
3870 | ||
3871 | temp = gen_reg_rtx (GET_MODE (valreg)); | |
3872 | ||
e4abc3d5 RH |
3873 | /* Construct an "equal form" for the value which mentions all the |
3874 | arguments in order as well as the function name. */ | |
3875 | for (i = 0; i < nargs; i++) | |
3876 | note = gen_rtx_EXPR_LIST (VOIDmode, argvec[i].value, note); | |
3877 | note = gen_rtx_EXPR_LIST (VOIDmode, fun, note); | |
ebb1b59a | 3878 | |
e4abc3d5 RH |
3879 | insns = get_insns (); |
3880 | end_sequence (); | |
ebb1b59a | 3881 | |
e4abc3d5 RH |
3882 | if (flags & ECF_PURE) |
3883 | note = gen_rtx_EXPR_LIST (VOIDmode, | |
3884 | gen_rtx_USE (VOIDmode, | |
3885 | gen_rtx_MEM (BLKmode, | |
3886 | gen_rtx_SCRATCH (VOIDmode))), | |
3887 | note); | |
3888 | ||
3889 | emit_libcall_block (insns, temp, valreg, note); | |
ebb1b59a | 3890 | |
e4abc3d5 RH |
3891 | valreg = temp; |
3892 | } | |
ebb1b59a | 3893 | } |
3c0fca12 RH |
3894 | pop_temp_slots (); |
3895 | ||
3896 | /* Copy the value to the right place. */ | |
de76b467 | 3897 | if (outmode != VOIDmode && retval) |
3c0fca12 RH |
3898 | { |
3899 | if (mem_value) | |
3900 | { | |
3901 | if (value == 0) | |
3902 | value = mem_value; | |
3903 | if (value != mem_value) | |
3904 | emit_move_insn (value, mem_value); | |
3905 | } | |
c3297561 AO |
3906 | else if (GET_CODE (valreg) == PARALLEL) |
3907 | { | |
3908 | if (value == 0) | |
3909 | value = gen_reg_rtx (outmode); | |
643642eb | 3910 | emit_group_store (value, valreg, NULL_TREE, GET_MODE_SIZE (outmode)); |
c3297561 | 3911 | } |
3c0fca12 | 3912 | else |
7ab0aca2 RH |
3913 | { |
3914 | /* Convert to the proper mode if PROMOTE_MODE has been active. */ | |
3915 | if (GET_MODE (valreg) != outmode) | |
3916 | { | |
3917 | int unsignedp = TYPE_UNSIGNED (tfom); | |
3918 | ||
3919 | gcc_assert (targetm.calls.promote_function_return (tfom)); | |
3920 | gcc_assert (promote_mode (tfom, outmode, &unsignedp, 0) | |
3921 | == GET_MODE (valreg)); | |
3922 | ||
3923 | valreg = convert_modes (outmode, GET_MODE (valreg), valreg, 0); | |
3924 | } | |
3925 | ||
3926 | if (value != 0) | |
3927 | emit_move_insn (value, valreg); | |
3928 | else | |
3929 | value = valreg; | |
3930 | } | |
3c0fca12 RH |
3931 | } |
3932 | ||
f73ad30e | 3933 | if (ACCUMULATE_OUTGOING_ARGS) |
3c0fca12 | 3934 | { |
f73ad30e JH |
3935 | #ifdef REG_PARM_STACK_SPACE |
3936 | if (save_area) | |
b820d2b8 AM |
3937 | restore_fixed_argument_area (save_area, argblock, |
3938 | high_to_save, low_to_save); | |
3c0fca12 | 3939 | #endif |
f725a3ec | 3940 | |
f73ad30e JH |
3941 | /* If we saved any argument areas, restore them. */ |
3942 | for (count = 0; count < nargs; count++) | |
3943 | if (argvec[count].save_area) | |
3944 | { | |
3945 | enum machine_mode save_mode = GET_MODE (argvec[count].save_area); | |
e7949876 AM |
3946 | rtx adr = plus_constant (argblock, |
3947 | argvec[count].locate.offset.constant); | |
3948 | rtx stack_area = gen_rtx_MEM (save_mode, | |
3949 | memory_address (save_mode, adr)); | |
f73ad30e | 3950 | |
9778f2f8 JH |
3951 | if (save_mode == BLKmode) |
3952 | emit_block_move (stack_area, | |
c22cacf3 | 3953 | validize_mem (argvec[count].save_area), |
9778f2f8 JH |
3954 | GEN_INT (argvec[count].locate.size.constant), |
3955 | BLOCK_OP_CALL_PARM); | |
3956 | else | |
3957 | emit_move_insn (stack_area, argvec[count].save_area); | |
f73ad30e | 3958 | } |
3c0fca12 | 3959 | |
f73ad30e JH |
3960 | highest_outgoing_arg_in_use = initial_highest_arg_in_use; |
3961 | stack_usage_map = initial_stack_usage_map; | |
3962 | } | |
43bc5f13 | 3963 | |
d9725c41 JJ |
3964 | if (stack_usage_map_buf) |
3965 | free (stack_usage_map_buf); | |
3966 | ||
de76b467 JH |
3967 | return value; |
3968 | ||
3969 | } | |
3970 | \f | |
3971 | /* Output a library call to function FUN (a SYMBOL_REF rtx) | |
3972 | (emitting the queue unless NO_QUEUE is nonzero), | |
3973 | for a value of mode OUTMODE, | |
3974 | with NARGS different arguments, passed as alternating rtx values | |
3975 | and machine_modes to convert them to. | |
de76b467 | 3976 | |
1258ee80 JJ |
3977 | FN_TYPE should be LCT_NORMAL for `normal' calls, LCT_CONST for `const' |
3978 | calls, LCT_PURE for `pure' calls, LCT_CONST_MAKE_BLOCK for `const' calls | |
3979 | which should be enclosed in REG_LIBCALL/REG_RETVAL notes, | |
3980 | LCT_PURE_MAKE_BLOCK for `purep' calls which should be enclosed in | |
3981 | REG_LIBCALL/REG_RETVAL notes with extra (use (memory (scratch)), | |
3982 | or other LCT_ value for other types of library calls. */ | |
de76b467 JH |
3983 | |
3984 | void | |
e34d07f2 KG |
3985 | emit_library_call (rtx orgfun, enum libcall_type fn_type, |
3986 | enum machine_mode outmode, int nargs, ...) | |
de76b467 | 3987 | { |
e34d07f2 | 3988 | va_list p; |
d329e058 | 3989 | |
e34d07f2 | 3990 | va_start (p, nargs); |
2a8f6b90 | 3991 | emit_library_call_value_1 (0, orgfun, NULL_RTX, fn_type, outmode, nargs, p); |
e34d07f2 | 3992 | va_end (p); |
de76b467 JH |
3993 | } |
3994 | \f | |
3995 | /* Like emit_library_call except that an extra argument, VALUE, | |
3996 | comes second and says where to store the result. | |
3997 | (If VALUE is zero, this function chooses a convenient way | |
3998 | to return the value. | |
3999 | ||
4000 | This function returns an rtx for where the value is to be found. | |
4001 | If VALUE is nonzero, VALUE is returned. */ | |
4002 | ||
4003 | rtx | |
e34d07f2 KG |
4004 | emit_library_call_value (rtx orgfun, rtx value, |
4005 | enum libcall_type fn_type, | |
4006 | enum machine_mode outmode, int nargs, ...) | |
de76b467 | 4007 | { |
6268b922 | 4008 | rtx result; |
e34d07f2 | 4009 | va_list p; |
d329e058 | 4010 | |
e34d07f2 | 4011 | va_start (p, nargs); |
6268b922 KG |
4012 | result = emit_library_call_value_1 (1, orgfun, value, fn_type, outmode, |
4013 | nargs, p); | |
e34d07f2 | 4014 | va_end (p); |
de76b467 | 4015 | |
6268b922 | 4016 | return result; |
322e3e34 RK |
4017 | } |
4018 | \f | |
51bbfa0c RS |
4019 | /* Store a single argument for a function call |
4020 | into the register or memory area where it must be passed. | |
4021 | *ARG describes the argument value and where to pass it. | |
4022 | ||
4023 | ARGBLOCK is the address of the stack-block for all the arguments, | |
d45cf215 | 4024 | or 0 on a machine where arguments are pushed individually. |
51bbfa0c RS |
4025 | |
4026 | MAY_BE_ALLOCA nonzero says this could be a call to `alloca' | |
f725a3ec | 4027 | so must be careful about how the stack is used. |
51bbfa0c RS |
4028 | |
4029 | VARIABLE_SIZE nonzero says that this was a variable-sized outgoing | |
4030 | argument stack. This is used if ACCUMULATE_OUTGOING_ARGS to indicate | |
4031 | that we need not worry about saving and restoring the stack. | |
4032 | ||
4c6b3b2a | 4033 | FNDECL is the declaration of the function we are calling. |
f725a3ec | 4034 | |
da7d8304 | 4035 | Return nonzero if this arg should cause sibcall failure, |
4c6b3b2a | 4036 | zero otherwise. */ |
51bbfa0c | 4037 | |
4c6b3b2a | 4038 | static int |
d329e058 AJ |
4039 | store_one_arg (struct arg_data *arg, rtx argblock, int flags, |
4040 | int variable_size ATTRIBUTE_UNUSED, int reg_parm_stack_space) | |
51bbfa0c | 4041 | { |
b3694847 | 4042 | tree pval = arg->tree_value; |
51bbfa0c RS |
4043 | rtx reg = 0; |
4044 | int partial = 0; | |
4045 | int used = 0; | |
6a651371 | 4046 | int i, lower_bound = 0, upper_bound = 0; |
4c6b3b2a | 4047 | int sibcall_failure = 0; |
51bbfa0c RS |
4048 | |
4049 | if (TREE_CODE (pval) == ERROR_MARK) | |
4c6b3b2a | 4050 | return 1; |
51bbfa0c | 4051 | |
cc79451b RK |
4052 | /* Push a new temporary level for any temporaries we make for |
4053 | this argument. */ | |
4054 | push_temp_slots (); | |
4055 | ||
f8a097cd | 4056 | if (ACCUMULATE_OUTGOING_ARGS && !(flags & ECF_SIBCALL)) |
51bbfa0c | 4057 | { |
f73ad30e JH |
4058 | /* If this is being stored into a pre-allocated, fixed-size, stack area, |
4059 | save any previous data at that location. */ | |
4060 | if (argblock && ! variable_size && arg->stack) | |
4061 | { | |
51bbfa0c | 4062 | #ifdef ARGS_GROW_DOWNWARD |
f73ad30e JH |
4063 | /* stack_slot is negative, but we want to index stack_usage_map |
4064 | with positive values. */ | |
4065 | if (GET_CODE (XEXP (arg->stack_slot, 0)) == PLUS) | |
4066 | upper_bound = -INTVAL (XEXP (XEXP (arg->stack_slot, 0), 1)) + 1; | |
4067 | else | |
4068 | upper_bound = 0; | |
51bbfa0c | 4069 | |
e7949876 | 4070 | lower_bound = upper_bound - arg->locate.size.constant; |
51bbfa0c | 4071 | #else |
f73ad30e JH |
4072 | if (GET_CODE (XEXP (arg->stack_slot, 0)) == PLUS) |
4073 | lower_bound = INTVAL (XEXP (XEXP (arg->stack_slot, 0), 1)); | |
4074 | else | |
4075 | lower_bound = 0; | |
51bbfa0c | 4076 | |
e7949876 | 4077 | upper_bound = lower_bound + arg->locate.size.constant; |
51bbfa0c RS |
4078 | #endif |
4079 | ||
546ff777 AM |
4080 | i = lower_bound; |
4081 | /* Don't worry about things in the fixed argument area; | |
4082 | it has already been saved. */ | |
4083 | if (i < reg_parm_stack_space) | |
4084 | i = reg_parm_stack_space; | |
4085 | while (i < upper_bound && stack_usage_map[i] == 0) | |
4086 | i++; | |
51bbfa0c | 4087 | |
546ff777 | 4088 | if (i < upper_bound) |
51bbfa0c | 4089 | { |
e7949876 AM |
4090 | /* We need to make a save area. */ |
4091 | unsigned int size = arg->locate.size.constant * BITS_PER_UNIT; | |
4092 | enum machine_mode save_mode = mode_for_size (size, MODE_INT, 1); | |
4093 | rtx adr = memory_address (save_mode, XEXP (arg->stack_slot, 0)); | |
4094 | rtx stack_area = gen_rtx_MEM (save_mode, adr); | |
f73ad30e JH |
4095 | |
4096 | if (save_mode == BLKmode) | |
4097 | { | |
1da68f56 RK |
4098 | tree ot = TREE_TYPE (arg->tree_value); |
4099 | tree nt = build_qualified_type (ot, (TYPE_QUALS (ot) | |
4100 | | TYPE_QUAL_CONST)); | |
4101 | ||
4102 | arg->save_area = assign_temp (nt, 0, 1, 1); | |
f73ad30e JH |
4103 | preserve_temp_slots (arg->save_area); |
4104 | emit_block_move (validize_mem (arg->save_area), stack_area, | |
7816b87e | 4105 | GEN_INT (arg->locate.size.constant), |
44bb111a | 4106 | BLOCK_OP_CALL_PARM); |
f73ad30e JH |
4107 | } |
4108 | else | |
4109 | { | |
4110 | arg->save_area = gen_reg_rtx (save_mode); | |
4111 | emit_move_insn (arg->save_area, stack_area); | |
4112 | } | |
51bbfa0c RS |
4113 | } |
4114 | } | |
4115 | } | |
b564df06 | 4116 | |
51bbfa0c RS |
4117 | /* If this isn't going to be placed on both the stack and in registers, |
4118 | set up the register and number of words. */ | |
4119 | if (! arg->pass_on_stack) | |
aa7634dd DM |
4120 | { |
4121 | if (flags & ECF_SIBCALL) | |
4122 | reg = arg->tail_call_reg; | |
4123 | else | |
4124 | reg = arg->reg; | |
4125 | partial = arg->partial; | |
4126 | } | |
51bbfa0c | 4127 | |
366de0ce NS |
4128 | /* Being passed entirely in a register. We shouldn't be called in |
4129 | this case. */ | |
4130 | gcc_assert (reg == 0 || partial != 0); | |
c22cacf3 | 4131 | |
4ab56118 RK |
4132 | /* If this arg needs special alignment, don't load the registers |
4133 | here. */ | |
4134 | if (arg->n_aligned_regs != 0) | |
4135 | reg = 0; | |
f725a3ec | 4136 | |
4ab56118 | 4137 | /* If this is being passed partially in a register, we can't evaluate |
51bbfa0c RS |
4138 | it directly into its stack slot. Otherwise, we can. */ |
4139 | if (arg->value == 0) | |
d64f5a78 | 4140 | { |
d64f5a78 RS |
4141 | /* stack_arg_under_construction is nonzero if a function argument is |
4142 | being evaluated directly into the outgoing argument list and | |
4143 | expand_call must take special action to preserve the argument list | |
4144 | if it is called recursively. | |
4145 | ||
4146 | For scalar function arguments stack_usage_map is sufficient to | |
4147 | determine which stack slots must be saved and restored. Scalar | |
4148 | arguments in general have pass_on_stack == 0. | |
4149 | ||
4150 | If this argument is initialized by a function which takes the | |
4151 | address of the argument (a C++ constructor or a C function | |
4152 | returning a BLKmode structure), then stack_usage_map is | |
4153 | insufficient and expand_call must push the stack around the | |
4154 | function call. Such arguments have pass_on_stack == 1. | |
4155 | ||
4156 | Note that it is always safe to set stack_arg_under_construction, | |
4157 | but this generates suboptimal code if set when not needed. */ | |
4158 | ||
4159 | if (arg->pass_on_stack) | |
4160 | stack_arg_under_construction++; | |
f73ad30e | 4161 | |
3a08477a RK |
4162 | arg->value = expand_expr (pval, |
4163 | (partial | |
4164 | || TYPE_MODE (TREE_TYPE (pval)) != arg->mode) | |
4165 | ? NULL_RTX : arg->stack, | |
8403445a | 4166 | VOIDmode, EXPAND_STACK_PARM); |
1efe6448 RK |
4167 | |
4168 | /* If we are promoting object (or for any other reason) the mode | |
4169 | doesn't agree, convert the mode. */ | |
4170 | ||
7373d92d RK |
4171 | if (arg->mode != TYPE_MODE (TREE_TYPE (pval))) |
4172 | arg->value = convert_modes (arg->mode, TYPE_MODE (TREE_TYPE (pval)), | |
4173 | arg->value, arg->unsignedp); | |
1efe6448 | 4174 | |
d64f5a78 RS |
4175 | if (arg->pass_on_stack) |
4176 | stack_arg_under_construction--; | |
d64f5a78 | 4177 | } |
51bbfa0c | 4178 | |
0dc42b03 | 4179 | /* Check for overlap with already clobbered argument area. */ |
07eef816 KH |
4180 | if ((flags & ECF_SIBCALL) |
4181 | && MEM_P (arg->value) | |
4182 | && mem_overlaps_already_clobbered_arg_p (XEXP (arg->value, 0), | |
4183 | arg->locate.size.constant)) | |
4184 | sibcall_failure = 1; | |
0dc42b03 | 4185 | |
51bbfa0c RS |
4186 | /* Don't allow anything left on stack from computation |
4187 | of argument to alloca. */ | |
f8a097cd | 4188 | if (flags & ECF_MAY_BE_ALLOCA) |
51bbfa0c RS |
4189 | do_pending_stack_adjust (); |
4190 | ||
4191 | if (arg->value == arg->stack) | |
37a08a29 RK |
4192 | /* If the value is already in the stack slot, we are done. */ |
4193 | ; | |
1efe6448 | 4194 | else if (arg->mode != BLKmode) |
51bbfa0c | 4195 | { |
b3694847 | 4196 | int size; |
46bd2bee | 4197 | unsigned int parm_align; |
51bbfa0c RS |
4198 | |
4199 | /* Argument is a scalar, not entirely passed in registers. | |
4200 | (If part is passed in registers, arg->partial says how much | |
4201 | and emit_push_insn will take care of putting it there.) | |
f725a3ec | 4202 | |
51bbfa0c RS |
4203 | Push it, and if its size is less than the |
4204 | amount of space allocated to it, | |
4205 | also bump stack pointer by the additional space. | |
4206 | Note that in C the default argument promotions | |
4207 | will prevent such mismatches. */ | |
4208 | ||
1efe6448 | 4209 | size = GET_MODE_SIZE (arg->mode); |
51bbfa0c RS |
4210 | /* Compute how much space the push instruction will push. |
4211 | On many machines, pushing a byte will advance the stack | |
4212 | pointer by a halfword. */ | |
4213 | #ifdef PUSH_ROUNDING | |
4214 | size = PUSH_ROUNDING (size); | |
4215 | #endif | |
4216 | used = size; | |
4217 | ||
4218 | /* Compute how much space the argument should get: | |
4219 | round up to a multiple of the alignment for arguments. */ | |
1efe6448 | 4220 | if (none != FUNCTION_ARG_PADDING (arg->mode, TREE_TYPE (pval))) |
51bbfa0c RS |
4221 | used = (((size + PARM_BOUNDARY / BITS_PER_UNIT - 1) |
4222 | / (PARM_BOUNDARY / BITS_PER_UNIT)) | |
4223 | * (PARM_BOUNDARY / BITS_PER_UNIT)); | |
4224 | ||
46bd2bee JM |
4225 | /* Compute the alignment of the pushed argument. */ |
4226 | parm_align = arg->locate.boundary; | |
4227 | if (FUNCTION_ARG_PADDING (arg->mode, TREE_TYPE (pval)) == downward) | |
4228 | { | |
4229 | int pad = used - size; | |
4230 | if (pad) | |
4231 | { | |
4232 | unsigned int pad_align = (pad & -pad) * BITS_PER_UNIT; | |
4233 | parm_align = MIN (parm_align, pad_align); | |
4234 | } | |
4235 | } | |
4236 | ||
51bbfa0c RS |
4237 | /* This isn't already where we want it on the stack, so put it there. |
4238 | This can either be done with push or copy insns. */ | |
d329e058 | 4239 | emit_push_insn (arg->value, arg->mode, TREE_TYPE (pval), NULL_RTX, |
46bd2bee | 4240 | parm_align, partial, reg, used - size, argblock, |
e7949876 AM |
4241 | ARGS_SIZE_RTX (arg->locate.offset), reg_parm_stack_space, |
4242 | ARGS_SIZE_RTX (arg->locate.alignment_pad)); | |
841404cd AO |
4243 | |
4244 | /* Unless this is a partially-in-register argument, the argument is now | |
4245 | in the stack. */ | |
4246 | if (partial == 0) | |
4247 | arg->value = arg->stack; | |
51bbfa0c RS |
4248 | } |
4249 | else | |
4250 | { | |
4251 | /* BLKmode, at least partly to be pushed. */ | |
4252 | ||
1b1f20ca | 4253 | unsigned int parm_align; |
b3694847 | 4254 | int excess; |
51bbfa0c RS |
4255 | rtx size_rtx; |
4256 | ||
4257 | /* Pushing a nonscalar. | |
4258 | If part is passed in registers, PARTIAL says how much | |
4259 | and emit_push_insn will take care of putting it there. */ | |
4260 | ||
4261 | /* Round its size up to a multiple | |
4262 | of the allocation unit for arguments. */ | |
4263 | ||
e7949876 | 4264 | if (arg->locate.size.var != 0) |
51bbfa0c RS |
4265 | { |
4266 | excess = 0; | |
e7949876 | 4267 | size_rtx = ARGS_SIZE_RTX (arg->locate.size); |
51bbfa0c RS |
4268 | } |
4269 | else | |
4270 | { | |
78a52f11 RH |
4271 | /* PUSH_ROUNDING has no effect on us, because emit_push_insn |
4272 | for BLKmode is careful to avoid it. */ | |
4273 | excess = (arg->locate.size.constant | |
4274 | - int_size_in_bytes (TREE_TYPE (pval)) | |
4275 | + partial); | |
db4c55f6 JM |
4276 | size_rtx = expand_expr (size_in_bytes (TREE_TYPE (pval)), |
4277 | NULL_RTX, TYPE_MODE (sizetype), 0); | |
51bbfa0c RS |
4278 | } |
4279 | ||
bfc45551 | 4280 | parm_align = arg->locate.boundary; |
1b1f20ca RH |
4281 | |
4282 | /* When an argument is padded down, the block is aligned to | |
4283 | PARM_BOUNDARY, but the actual argument isn't. */ | |
4284 | if (FUNCTION_ARG_PADDING (arg->mode, TREE_TYPE (pval)) == downward) | |
4285 | { | |
e7949876 | 4286 | if (arg->locate.size.var) |
1b1f20ca RH |
4287 | parm_align = BITS_PER_UNIT; |
4288 | else if (excess) | |
4289 | { | |
97d05bfd | 4290 | unsigned int excess_align = (excess & -excess) * BITS_PER_UNIT; |
1b1f20ca RH |
4291 | parm_align = MIN (parm_align, excess_align); |
4292 | } | |
4293 | } | |
4294 | ||
3c0cb5de | 4295 | if ((flags & ECF_SIBCALL) && MEM_P (arg->value)) |
4c6b3b2a JJ |
4296 | { |
4297 | /* emit_push_insn might not work properly if arg->value and | |
e7949876 | 4298 | argblock + arg->locate.offset areas overlap. */ |
4c6b3b2a JJ |
4299 | rtx x = arg->value; |
4300 | int i = 0; | |
4301 | ||
4302 | if (XEXP (x, 0) == current_function_internal_arg_pointer | |
4303 | || (GET_CODE (XEXP (x, 0)) == PLUS | |
4304 | && XEXP (XEXP (x, 0), 0) == | |
4305 | current_function_internal_arg_pointer | |
4306 | && GET_CODE (XEXP (XEXP (x, 0), 1)) == CONST_INT)) | |
4307 | { | |
4308 | if (XEXP (x, 0) != current_function_internal_arg_pointer) | |
4309 | i = INTVAL (XEXP (XEXP (x, 0), 1)); | |
4310 | ||
e0a21ab9 | 4311 | /* expand_call should ensure this. */ |
366de0ce NS |
4312 | gcc_assert (!arg->locate.offset.var |
4313 | && GET_CODE (size_rtx) == CONST_INT); | |
4c6b3b2a | 4314 | |
e7949876 | 4315 | if (arg->locate.offset.constant > i) |
4c6b3b2a | 4316 | { |
e7949876 | 4317 | if (arg->locate.offset.constant < i + INTVAL (size_rtx)) |
4c6b3b2a JJ |
4318 | sibcall_failure = 1; |
4319 | } | |
e7949876 | 4320 | else if (arg->locate.offset.constant < i) |
4c6b3b2a | 4321 | { |
e7949876 | 4322 | if (i < arg->locate.offset.constant + INTVAL (size_rtx)) |
4c6b3b2a JJ |
4323 | sibcall_failure = 1; |
4324 | } | |
4325 | } | |
4326 | } | |
4327 | ||
1efe6448 | 4328 | emit_push_insn (arg->value, arg->mode, TREE_TYPE (pval), size_rtx, |
1b1f20ca | 4329 | parm_align, partial, reg, excess, argblock, |
e7949876 AM |
4330 | ARGS_SIZE_RTX (arg->locate.offset), reg_parm_stack_space, |
4331 | ARGS_SIZE_RTX (arg->locate.alignment_pad)); | |
51bbfa0c | 4332 | |
841404cd AO |
4333 | /* Unless this is a partially-in-register argument, the argument is now |
4334 | in the stack. | |
51bbfa0c | 4335 | |
841404cd AO |
4336 | ??? Unlike the case above, in which we want the actual |
4337 | address of the data, so that we can load it directly into a | |
4338 | register, here we want the address of the stack slot, so that | |
4339 | it's properly aligned for word-by-word copying or something | |
4340 | like that. It's not clear that this is always correct. */ | |
4341 | if (partial == 0) | |
4342 | arg->value = arg->stack_slot; | |
4343 | } | |
8df3dbb7 RH |
4344 | |
4345 | if (arg->reg && GET_CODE (arg->reg) == PARALLEL) | |
4346 | { | |
4347 | tree type = TREE_TYPE (arg->tree_value); | |
4348 | arg->parallel_value | |
4349 | = emit_group_load_into_temps (arg->reg, arg->value, type, | |
4350 | int_size_in_bytes (type)); | |
4351 | } | |
51bbfa0c | 4352 | |
8403445a AM |
4353 | /* Mark all slots this store used. */ |
4354 | if (ACCUMULATE_OUTGOING_ARGS && !(flags & ECF_SIBCALL) | |
4355 | && argblock && ! variable_size && arg->stack) | |
4356 | for (i = lower_bound; i < upper_bound; i++) | |
4357 | stack_usage_map[i] = 1; | |
4358 | ||
51bbfa0c RS |
4359 | /* Once we have pushed something, pops can't safely |
4360 | be deferred during the rest of the arguments. */ | |
4361 | NO_DEFER_POP; | |
4362 | ||
db907e7b RK |
4363 | /* Free any temporary slots made in processing this argument. Show |
4364 | that we might have taken the address of something and pushed that | |
4365 | as an operand. */ | |
4366 | preserve_temp_slots (NULL_RTX); | |
51bbfa0c | 4367 | free_temp_slots (); |
cc79451b | 4368 | pop_temp_slots (); |
4c6b3b2a JJ |
4369 | |
4370 | return sibcall_failure; | |
51bbfa0c | 4371 | } |
a4b1b92a | 4372 | |
fe984136 | 4373 | /* Nonzero if we do not know how to pass TYPE solely in registers. */ |
a4b1b92a | 4374 | |
fe984136 RH |
4375 | bool |
4376 | must_pass_in_stack_var_size (enum machine_mode mode ATTRIBUTE_UNUSED, | |
4377 | tree type) | |
4378 | { | |
4379 | if (!type) | |
4380 | return false; | |
4381 | ||
4382 | /* If the type has variable size... */ | |
4383 | if (TREE_CODE (TYPE_SIZE (type)) != INTEGER_CST) | |
4384 | return true; | |
a4b1b92a | 4385 | |
fe984136 RH |
4386 | /* If the type is marked as addressable (it is required |
4387 | to be constructed into the stack)... */ | |
4388 | if (TREE_ADDRESSABLE (type)) | |
4389 | return true; | |
4390 | ||
4391 | return false; | |
4392 | } | |
a4b1b92a | 4393 | |
7ae4ad28 | 4394 | /* Another version of the TARGET_MUST_PASS_IN_STACK hook. This one |
fe984136 RH |
4395 | takes trailing padding of a structure into account. */ |
4396 | /* ??? Should be able to merge these two by examining BLOCK_REG_PADDING. */ | |
a4b1b92a RH |
4397 | |
4398 | bool | |
fe984136 | 4399 | must_pass_in_stack_var_size_or_pad (enum machine_mode mode, tree type) |
a4b1b92a RH |
4400 | { |
4401 | if (!type) | |
40cdfd5a | 4402 | return false; |
a4b1b92a RH |
4403 | |
4404 | /* If the type has variable size... */ | |
4405 | if (TREE_CODE (TYPE_SIZE (type)) != INTEGER_CST) | |
4406 | return true; | |
4407 | ||
4408 | /* If the type is marked as addressable (it is required | |
4409 | to be constructed into the stack)... */ | |
4410 | if (TREE_ADDRESSABLE (type)) | |
4411 | return true; | |
4412 | ||
4413 | /* If the padding and mode of the type is such that a copy into | |
4414 | a register would put it into the wrong part of the register. */ | |
4415 | if (mode == BLKmode | |
4416 | && int_size_in_bytes (type) % (PARM_BOUNDARY / BITS_PER_UNIT) | |
4417 | && (FUNCTION_ARG_PADDING (mode, type) | |
4418 | == (BYTES_BIG_ENDIAN ? upward : downward))) | |
4419 | return true; | |
4420 | ||
4421 | return false; | |
4422 | } |