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66d433c7 | 1 | /* Convert function calls to rtl insns, for GNU C compiler. |
ca628a86 | 2 | Copyright (C) 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998 |
3 | 1999, 2000 Free Software Foundation, Inc. | |
66d433c7 | 4 | |
5 | This file is part of GNU CC. | |
6 | ||
7 | GNU CC is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 2, or (at your option) | |
10 | any later version. | |
11 | ||
12 | GNU CC is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with GNU CC; see the file COPYING. If not, write to | |
8d62a21c | 19 | the Free Software Foundation, 59 Temple Place - Suite 330, |
20 | Boston, MA 02111-1307, USA. */ | |
66d433c7 | 21 | |
22 | #include "config.h" | |
405711de | 23 | #include "system.h" |
24 | #include "rtl.h" | |
25 | #include "tree.h" | |
26 | #include "flags.h" | |
27 | #include "expr.h" | |
0a893c29 | 28 | #include "function.h" |
405711de | 29 | #include "regs.h" |
66d433c7 | 30 | #include "insn-flags.h" |
9cdfa0b0 | 31 | #include "toplev.h" |
cd03a192 | 32 | #include "output.h" |
075136a2 | 33 | #include "tm_p.h" |
a6260fc7 | 34 | #include "timevar.h" |
7ecc63d3 | 35 | #include "sbitmap.h" |
66d433c7 | 36 | |
4448f543 | 37 | #ifndef ACCUMULATE_OUTGOING_ARGS |
38 | #define ACCUMULATE_OUTGOING_ARGS 0 | |
39 | #endif | |
40 | ||
41 | /* Supply a default definition for PUSH_ARGS. */ | |
42 | #ifndef PUSH_ARGS | |
43 | #ifdef PUSH_ROUNDING | |
44 | #define PUSH_ARGS !ACCUMULATE_OUTGOING_ARGS | |
45 | #else | |
46 | #define PUSH_ARGS 0 | |
47 | #endif | |
48 | #endif | |
49 | ||
60ecc450 | 50 | #if !defined FUNCTION_OK_FOR_SIBCALL |
51 | #define FUNCTION_OK_FOR_SIBCALL(DECL) 1 | |
52 | #endif | |
53 | ||
dfb1ee39 | 54 | #if !defined PREFERRED_STACK_BOUNDARY && defined STACK_BOUNDARY |
55 | #define PREFERRED_STACK_BOUNDARY STACK_BOUNDARY | |
56 | #endif | |
57 | ||
66d433c7 | 58 | /* Decide whether a function's arguments should be processed |
7473731d | 59 | from first to last or from last to first. |
60 | ||
61 | They should if the stack and args grow in opposite directions, but | |
62 | only if we have push insns. */ | |
66d433c7 | 63 | |
66d433c7 | 64 | #ifdef PUSH_ROUNDING |
7473731d | 65 | |
98fdb244 | 66 | #if defined (STACK_GROWS_DOWNWARD) != defined (ARGS_GROW_DOWNWARD) |
4448f543 | 67 | #define PUSH_ARGS_REVERSED PUSH_ARGS |
66d433c7 | 68 | #endif |
7473731d | 69 | |
66d433c7 | 70 | #endif |
71 | ||
4448f543 | 72 | #ifndef PUSH_ARGS_REVERSED |
73 | #define PUSH_ARGS_REVERSED 0 | |
74 | #endif | |
75 | ||
dfb1ee39 | 76 | /* Like PREFERRED_STACK_BOUNDARY but in units of bytes, not bits. */ |
77 | #define STACK_BYTES (PREFERRED_STACK_BOUNDARY / BITS_PER_UNIT) | |
66d433c7 | 78 | |
79 | /* Data structure and subroutines used within expand_call. */ | |
80 | ||
81 | struct arg_data | |
82 | { | |
83 | /* Tree node for this argument. */ | |
84 | tree tree_value; | |
1c0c37a5 | 85 | /* Mode for value; TYPE_MODE unless promoted. */ |
86 | enum machine_mode mode; | |
66d433c7 | 87 | /* Current RTL value for argument, or 0 if it isn't precomputed. */ |
88 | rtx value; | |
89 | /* Initially-compute RTL value for argument; only for const functions. */ | |
90 | rtx initial_value; | |
91 | /* Register to pass this argument in, 0 if passed on stack, or an | |
566d850a | 92 | PARALLEL if the arg is to be copied into multiple non-contiguous |
66d433c7 | 93 | registers. */ |
94 | rtx reg; | |
0e0be288 | 95 | /* Register to pass this argument in when generating tail call sequence. |
96 | This is not the same register as for normal calls on machines with | |
97 | register windows. */ | |
98 | rtx tail_call_reg; | |
23eb5fa6 | 99 | /* If REG was promoted from the actual mode of the argument expression, |
100 | indicates whether the promotion is sign- or zero-extended. */ | |
101 | int unsignedp; | |
66d433c7 | 102 | /* Number of registers to use. 0 means put the whole arg in registers. |
103 | Also 0 if not passed in registers. */ | |
104 | int partial; | |
f848041f | 105 | /* Non-zero if argument must be passed on stack. |
106 | Note that some arguments may be passed on the stack | |
107 | even though pass_on_stack is zero, just because FUNCTION_ARG says so. | |
108 | pass_on_stack identifies arguments that *cannot* go in registers. */ | |
66d433c7 | 109 | int pass_on_stack; |
110 | /* Offset of this argument from beginning of stack-args. */ | |
111 | struct args_size offset; | |
112 | /* Similar, but offset to the start of the stack slot. Different from | |
113 | OFFSET if this arg pads downward. */ | |
114 | struct args_size slot_offset; | |
115 | /* Size of this argument on the stack, rounded up for any padding it gets, | |
116 | parts of the argument passed in registers do not count. | |
117 | If REG_PARM_STACK_SPACE is defined, then register parms | |
118 | are counted here as well. */ | |
119 | struct args_size size; | |
120 | /* Location on the stack at which parameter should be stored. The store | |
121 | has already been done if STACK == VALUE. */ | |
122 | rtx stack; | |
123 | /* Location on the stack of the start of this argument slot. This can | |
124 | differ from STACK if this arg pads downward. This location is known | |
125 | to be aligned to FUNCTION_ARG_BOUNDARY. */ | |
126 | rtx stack_slot; | |
66d433c7 | 127 | /* Place that this stack area has been saved, if needed. */ |
128 | rtx save_area; | |
f28c7a75 | 129 | /* If an argument's alignment does not permit direct copying into registers, |
130 | copy in smaller-sized pieces into pseudos. These are stored in a | |
131 | block pointed to by this field. The next field says how many | |
132 | word-sized pseudos we made. */ | |
133 | rtx *aligned_regs; | |
134 | int n_aligned_regs; | |
9d855d2f | 135 | /* The amount that the stack pointer needs to be adjusted to |
136 | force alignment for the next argument. */ | |
137 | struct args_size alignment_pad; | |
66d433c7 | 138 | }; |
139 | ||
41332f48 | 140 | /* A vector of one char per byte of stack space. A byte if non-zero if |
66d433c7 | 141 | the corresponding stack location has been used. |
142 | This vector is used to prevent a function call within an argument from | |
143 | clobbering any stack already set up. */ | |
144 | static char *stack_usage_map; | |
145 | ||
146 | /* Size of STACK_USAGE_MAP. */ | |
147 | static int highest_outgoing_arg_in_use; | |
d1b03b62 | 148 | |
7ecc63d3 | 149 | /* A bitmap of virtual-incoming stack space. Bit is set if the corresponding |
150 | stack location's tail call argument has been already stored into the stack. | |
151 | This bitmap is used to prevent sibling call optimization if function tries | |
152 | to use parent's incoming argument slots when they have been already | |
153 | overwritten with tail call arguments. */ | |
154 | static sbitmap stored_args_map; | |
155 | ||
d1b03b62 | 156 | /* stack_arg_under_construction is nonzero when an argument may be |
157 | initialized with a constructor call (including a C function that | |
158 | returns a BLKmode struct) and expand_call must take special action | |
159 | to make sure the object being constructed does not overlap the | |
160 | argument list for the constructor call. */ | |
161 | int stack_arg_under_construction; | |
66d433c7 | 162 | |
6bcfea9e | 163 | static int calls_function PARAMS ((tree, int)); |
164 | static int calls_function_1 PARAMS ((tree, int)); | |
60ecc450 | 165 | |
dfe08167 | 166 | /* Nonzero if this is a call to a `const' function. */ |
167 | #define ECF_CONST 1 | |
168 | /* Nonzero if this is a call to a `volatile' function. */ | |
169 | #define ECF_NORETURN 2 | |
170 | /* Nonzero if this is a call to malloc or a related function. */ | |
171 | #define ECF_MALLOC 4 | |
172 | /* Nonzero if it is plausible that this is a call to alloca. */ | |
173 | #define ECF_MAY_BE_ALLOCA 8 | |
174 | /* Nonzero if this is a call to a function that won't throw an exception. */ | |
175 | #define ECF_NOTHROW 16 | |
176 | /* Nonzero if this is a call to setjmp or a related function. */ | |
177 | #define ECF_RETURNS_TWICE 32 | |
178 | /* Nonzero if this is a call to `longjmp'. */ | |
179 | #define ECF_LONGJMP 64 | |
180 | /* Nonzero if this is a syscall that makes a new process in the image of | |
181 | the current one. */ | |
182 | #define ECF_FORK_OR_EXEC 128 | |
183 | #define ECF_SIBCALL 256 | |
26dfc457 | 184 | /* Nonzero if this is a call to "pure" function (like const function, |
185 | but may read memory. */ | |
186 | #define ECF_PURE 512 | |
dfe08167 | 187 | |
6bcfea9e | 188 | static void emit_call_1 PARAMS ((rtx, tree, tree, HOST_WIDE_INT, |
189 | HOST_WIDE_INT, HOST_WIDE_INT, rtx, | |
60ecc450 | 190 | rtx, int, rtx, int)); |
6bcfea9e | 191 | static void precompute_register_parameters PARAMS ((int, |
192 | struct arg_data *, | |
193 | int *)); | |
57679d39 | 194 | static int store_one_arg PARAMS ((struct arg_data *, rtx, int, int, |
6bcfea9e | 195 | int)); |
196 | static void store_unaligned_arguments_into_pseudos PARAMS ((struct arg_data *, | |
197 | int)); | |
198 | static int finalize_must_preallocate PARAMS ((int, int, | |
199 | struct arg_data *, | |
200 | struct args_size *)); | |
c6aec8f8 | 201 | static void precompute_arguments PARAMS ((int, int, |
202 | struct arg_data *)); | |
6bcfea9e | 203 | static int compute_argument_block_size PARAMS ((int, |
d0285dd8 | 204 | struct args_size *, |
205 | int)); | |
6bcfea9e | 206 | static void initialize_argument_information PARAMS ((int, |
207 | struct arg_data *, | |
208 | struct args_size *, | |
209 | int, tree, tree, | |
210 | CUMULATIVE_ARGS *, | |
211 | int, rtx *, int *, | |
dfe08167 | 212 | int *, int *)); |
6bcfea9e | 213 | static void compute_argument_addresses PARAMS ((struct arg_data *, |
214 | rtx, int)); | |
215 | static rtx rtx_for_function_call PARAMS ((tree, tree)); | |
216 | static void load_register_parameters PARAMS ((struct arg_data *, | |
0e0be288 | 217 | int, rtx *, int)); |
00dd2e9e | 218 | static int libfunc_nothrow PARAMS ((rtx)); |
20f7032f | 219 | static rtx emit_library_call_value_1 PARAMS ((int, rtx, rtx, int, |
220 | enum machine_mode, | |
221 | int, va_list)); | |
dfe08167 | 222 | static int special_function_p PARAMS ((tree, int)); |
223 | static int flags_from_decl_or_type PARAMS ((tree)); | |
224 | static rtx try_to_integrate PARAMS ((tree, tree, rtx, | |
225 | int, tree, rtx)); | |
7ecc63d3 | 226 | static int check_sibcall_argument_overlap_1 PARAMS ((rtx)); |
227 | static int check_sibcall_argument_overlap PARAMS ((rtx, struct arg_data *)); | |
228 | ||
481feae3 | 229 | static int combine_pending_stack_adjustment_and_call |
92e1ef5b | 230 | PARAMS ((int, struct args_size *, int)); |
cde25025 | 231 | |
4448f543 | 232 | #ifdef REG_PARM_STACK_SPACE |
6bcfea9e | 233 | static rtx save_fixed_argument_area PARAMS ((int, rtx, int *, int *)); |
234 | static void restore_fixed_argument_area PARAMS ((rtx, rtx, int, int)); | |
6a0e6138 | 235 | #endif |
66d433c7 | 236 | \f |
1e04f829 | 237 | /* If WHICH is 1, return 1 if EXP contains a call to the built-in function |
238 | `alloca'. | |
239 | ||
240 | If WHICH is 0, return 1 if EXP contains a call to any function. | |
241 | Actually, we only need return 1 if evaluating EXP would require pushing | |
242 | arguments on the stack, but that is too difficult to compute, so we just | |
243 | assume any function call might require the stack. */ | |
66d433c7 | 244 | |
9640e7db | 245 | static tree calls_function_save_exprs; |
246 | ||
66d433c7 | 247 | static int |
1e04f829 | 248 | calls_function (exp, which) |
66d433c7 | 249 | tree exp; |
1e04f829 | 250 | int which; |
9640e7db | 251 | { |
252 | int val; | |
f3c6d29a | 253 | |
9640e7db | 254 | calls_function_save_exprs = 0; |
255 | val = calls_function_1 (exp, which); | |
256 | calls_function_save_exprs = 0; | |
257 | return val; | |
258 | } | |
259 | ||
f3c6d29a | 260 | /* Recursive function to do the work of above function. */ |
261 | ||
9640e7db | 262 | static int |
263 | calls_function_1 (exp, which) | |
264 | tree exp; | |
265 | int which; | |
66d433c7 | 266 | { |
267 | register int i; | |
ff9e1799 | 268 | enum tree_code code = TREE_CODE (exp); |
f3c6d29a | 269 | int class = TREE_CODE_CLASS (code); |
270 | int length = first_rtl_op (code); | |
66d433c7 | 271 | |
01cc3b75 | 272 | /* If this code is language-specific, we don't know what it will do. */ |
ff9e1799 | 273 | if ((int) code >= NUM_TREE_CODES) |
274 | return 1; | |
66d433c7 | 275 | |
ff9e1799 | 276 | switch (code) |
66d433c7 | 277 | { |
278 | case CALL_EXPR: | |
1e04f829 | 279 | if (which == 0) |
280 | return 1; | |
281 | else if (TREE_CODE (TREE_OPERAND (exp, 0)) == ADDR_EXPR | |
282 | && (TREE_CODE (TREE_OPERAND (TREE_OPERAND (exp, 0), 0)) | |
f3c6d29a | 283 | == FUNCTION_DECL) |
284 | && (special_function_p (TREE_OPERAND (TREE_OPERAND (exp, 0), 0), | |
285 | 0) | |
286 | & ECF_MAY_BE_ALLOCA)) | |
287 | return 1; | |
66d433c7 | 288 | |
66d433c7 | 289 | break; |
290 | ||
291 | case SAVE_EXPR: | |
292 | if (SAVE_EXPR_RTL (exp) != 0) | |
293 | return 0; | |
9640e7db | 294 | if (value_member (exp, calls_function_save_exprs)) |
295 | return 0; | |
296 | calls_function_save_exprs = tree_cons (NULL_TREE, exp, | |
297 | calls_function_save_exprs); | |
298 | return (TREE_OPERAND (exp, 0) != 0 | |
299 | && calls_function_1 (TREE_OPERAND (exp, 0), which)); | |
66d433c7 | 300 | |
301 | case BLOCK: | |
80f6ed33 | 302 | { |
303 | register tree local; | |
f3c6d29a | 304 | register tree subblock; |
80f6ed33 | 305 | |
306 | for (local = BLOCK_VARS (exp); local; local = TREE_CHAIN (local)) | |
1e04f829 | 307 | if (DECL_INITIAL (local) != 0 |
9640e7db | 308 | && calls_function_1 (DECL_INITIAL (local), which)) |
80f6ed33 | 309 | return 1; |
80f6ed33 | 310 | |
311 | for (subblock = BLOCK_SUBBLOCKS (exp); | |
312 | subblock; | |
313 | subblock = TREE_CHAIN (subblock)) | |
9640e7db | 314 | if (calls_function_1 (subblock, which)) |
80f6ed33 | 315 | return 1; |
316 | } | |
317 | return 0; | |
f3c6d29a | 318 | |
6471239d | 319 | case TREE_LIST: |
320 | for (; exp != 0; exp = TREE_CHAIN (exp)) | |
321 | if (calls_function_1 (TREE_VALUE (exp), which)) | |
322 | return 1; | |
323 | return 0; | |
66d433c7 | 324 | |
0dbd1c74 | 325 | default: |
326 | break; | |
66d433c7 | 327 | } |
328 | ||
f3c6d29a | 329 | /* Only expressions, references, and blocks can contain calls. */ |
330 | if (! IS_EXPR_CODE_CLASS (class) && class != 'r' && class != 'b') | |
6471239d | 331 | return 0; |
332 | ||
66d433c7 | 333 | for (i = 0; i < length; i++) |
334 | if (TREE_OPERAND (exp, i) != 0 | |
9640e7db | 335 | && calls_function_1 (TREE_OPERAND (exp, i), which)) |
66d433c7 | 336 | return 1; |
337 | ||
338 | return 0; | |
339 | } | |
340 | \f | |
341 | /* Force FUNEXP into a form suitable for the address of a CALL, | |
342 | and return that as an rtx. Also load the static chain register | |
343 | if FNDECL is a nested function. | |
344 | ||
8866f42d | 345 | CALL_FUSAGE points to a variable holding the prospective |
346 | CALL_INSN_FUNCTION_USAGE information. */ | |
66d433c7 | 347 | |
d9076622 | 348 | rtx |
8866f42d | 349 | prepare_call_address (funexp, fndecl, call_fusage, reg_parm_seen) |
66d433c7 | 350 | rtx funexp; |
351 | tree fndecl; | |
8866f42d | 352 | rtx *call_fusage; |
a89aeae3 | 353 | int reg_parm_seen; |
66d433c7 | 354 | { |
355 | rtx static_chain_value = 0; | |
356 | ||
357 | funexp = protect_from_queue (funexp, 0); | |
358 | ||
359 | if (fndecl != 0) | |
a92771b8 | 360 | /* Get possible static chain value for nested function in C. */ |
66d433c7 | 361 | static_chain_value = lookup_static_chain (fndecl); |
362 | ||
363 | /* Make a valid memory address and copy constants thru pseudo-regs, | |
364 | but not for a constant address if -fno-function-cse. */ | |
365 | if (GET_CODE (funexp) != SYMBOL_REF) | |
a89aeae3 | 366 | /* If we are using registers for parameters, force the |
0dbd1c74 | 367 | function address into a register now. */ |
368 | funexp = ((SMALL_REGISTER_CLASSES && reg_parm_seen) | |
369 | ? force_not_mem (memory_address (FUNCTION_MODE, funexp)) | |
370 | : memory_address (FUNCTION_MODE, funexp)); | |
66d433c7 | 371 | else |
372 | { | |
373 | #ifndef NO_FUNCTION_CSE | |
374 | if (optimize && ! flag_no_function_cse) | |
375 | #ifdef NO_RECURSIVE_FUNCTION_CSE | |
376 | if (fndecl != current_function_decl) | |
377 | #endif | |
378 | funexp = force_reg (Pmode, funexp); | |
379 | #endif | |
380 | } | |
381 | ||
382 | if (static_chain_value != 0) | |
383 | { | |
384 | emit_move_insn (static_chain_rtx, static_chain_value); | |
385 | ||
4eb91f6f | 386 | if (GET_CODE (static_chain_rtx) == REG) |
387 | use_reg (call_fusage, static_chain_rtx); | |
66d433c7 | 388 | } |
389 | ||
390 | return funexp; | |
391 | } | |
392 | ||
393 | /* Generate instructions to call function FUNEXP, | |
394 | and optionally pop the results. | |
395 | The CALL_INSN is the first insn generated. | |
396 | ||
c74d0a20 | 397 | FNDECL is the declaration node of the function. This is given to the |
e93a4612 | 398 | macro RETURN_POPS_ARGS to determine whether this function pops its own args. |
399 | ||
d429bc10 | 400 | FUNTYPE is the data type of the function. This is given to the macro |
401 | RETURN_POPS_ARGS to determine whether this function pops its own args. | |
402 | We used to allow an identifier for library functions, but that doesn't | |
403 | work when the return type is an aggregate type and the calling convention | |
404 | says that the pointer to this aggregate is to be popped by the callee. | |
66d433c7 | 405 | |
406 | STACK_SIZE is the number of bytes of arguments on the stack, | |
a62b99b7 | 407 | ROUNDED_STACK_SIZE is that number rounded up to |
408 | PREFERRED_STACK_BOUNDARY; zero if the size is variable. This is | |
409 | both to put into the call insn and to generate explicit popping | |
410 | code if necessary. | |
66d433c7 | 411 | |
412 | STRUCT_VALUE_SIZE is the number of bytes wanted in a structure value. | |
413 | It is zero if this call doesn't want a structure value. | |
414 | ||
415 | NEXT_ARG_REG is the rtx that results from executing | |
416 | FUNCTION_ARG (args_so_far, VOIDmode, void_type_node, 1) | |
417 | just after all the args have had their registers assigned. | |
418 | This could be whatever you like, but normally it is the first | |
419 | arg-register beyond those used for args in this call, | |
420 | or 0 if all the arg-registers are used in this call. | |
421 | It is passed on to `gen_call' so you can put this info in the call insn. | |
422 | ||
423 | VALREG is a hard register in which a value is returned, | |
424 | or 0 if the call does not return a value. | |
425 | ||
426 | OLD_INHIBIT_DEFER_POP is the value that `inhibit_defer_pop' had before | |
427 | the args to this call were processed. | |
428 | We restore `inhibit_defer_pop' to that value. | |
429 | ||
07409b3a | 430 | CALL_FUSAGE is either empty or an EXPR_LIST of USE expressions that |
dfe08167 | 431 | denote registers used by the called function. */ |
66d433c7 | 432 | |
8ddf1c7e | 433 | static void |
e39fae61 | 434 | emit_call_1 (funexp, fndecl, funtype, stack_size, rounded_stack_size, |
435 | struct_value_size, next_arg_reg, valreg, old_inhibit_defer_pop, | |
60ecc450 | 436 | call_fusage, ecf_flags) |
66d433c7 | 437 | rtx funexp; |
57380eb2 | 438 | tree fndecl ATTRIBUTE_UNUSED; |
439 | tree funtype ATTRIBUTE_UNUSED; | |
df9f2bb6 | 440 | HOST_WIDE_INT stack_size ATTRIBUTE_UNUSED; |
e39fae61 | 441 | HOST_WIDE_INT rounded_stack_size; |
2c3bea77 | 442 | HOST_WIDE_INT struct_value_size ATTRIBUTE_UNUSED; |
66d433c7 | 443 | rtx next_arg_reg; |
444 | rtx valreg; | |
445 | int old_inhibit_defer_pop; | |
8866f42d | 446 | rtx call_fusage; |
60ecc450 | 447 | int ecf_flags; |
66d433c7 | 448 | { |
dd837bff | 449 | rtx rounded_stack_size_rtx = GEN_INT (rounded_stack_size); |
66d433c7 | 450 | rtx call_insn; |
451 | int already_popped = 0; | |
e39fae61 | 452 | HOST_WIDE_INT n_popped = RETURN_POPS_ARGS (fndecl, funtype, stack_size); |
2ed6c343 | 453 | #if defined (HAVE_call) && defined (HAVE_call_value) |
454 | rtx struct_value_size_rtx; | |
455 | struct_value_size_rtx = GEN_INT (struct_value_size); | |
456 | #endif | |
66d433c7 | 457 | |
458 | /* Ensure address is valid. SYMBOL_REF is already valid, so no need, | |
459 | and we don't want to load it into a register as an optimization, | |
460 | because prepare_call_address already did it if it should be done. */ | |
461 | if (GET_CODE (funexp) != SYMBOL_REF) | |
462 | funexp = memory_address (FUNCTION_MODE, funexp); | |
463 | ||
60ecc450 | 464 | #if defined (HAVE_sibcall_pop) && defined (HAVE_sibcall_value_pop) |
465 | if ((ecf_flags & ECF_SIBCALL) | |
466 | && HAVE_sibcall_pop && HAVE_sibcall_value_pop | |
467 | && (RETURN_POPS_ARGS (fndecl, funtype, stack_size) > 0 | |
468 | || stack_size == 0)) | |
469 | { | |
470 | rtx n_pop = GEN_INT (RETURN_POPS_ARGS (fndecl, funtype, stack_size)); | |
471 | rtx pat; | |
472 | ||
473 | /* If this subroutine pops its own args, record that in the call insn | |
474 | if possible, for the sake of frame pointer elimination. */ | |
475 | ||
476 | if (valreg) | |
2ed6c343 | 477 | pat = GEN_SIBCALL_VALUE_POP (valreg, |
60ecc450 | 478 | gen_rtx_MEM (FUNCTION_MODE, funexp), |
479 | rounded_stack_size_rtx, next_arg_reg, | |
480 | n_pop); | |
481 | else | |
2ed6c343 | 482 | pat = GEN_SIBCALL_POP (gen_rtx_MEM (FUNCTION_MODE, funexp), |
60ecc450 | 483 | rounded_stack_size_rtx, next_arg_reg, n_pop); |
484 | ||
485 | emit_call_insn (pat); | |
486 | already_popped = 1; | |
487 | } | |
488 | else | |
489 | #endif | |
490 | ||
66d433c7 | 491 | #if defined (HAVE_call_pop) && defined (HAVE_call_value_pop) |
ec596f3b | 492 | /* If the target has "call" or "call_value" insns, then prefer them |
493 | if no arguments are actually popped. If the target does not have | |
494 | "call" or "call_value" insns, then we must use the popping versions | |
495 | even if the call has no arguments to pop. */ | |
496 | #if defined (HAVE_call) && defined (HAVE_call_value) | |
497 | if (HAVE_call && HAVE_call_value && HAVE_call_pop && HAVE_call_value_pop | |
4448f543 | 498 | && n_popped > 0) |
ec596f3b | 499 | #else |
500 | if (HAVE_call_pop && HAVE_call_value_pop) | |
501 | #endif | |
66d433c7 | 502 | { |
e39fae61 | 503 | rtx n_pop = GEN_INT (n_popped); |
66d433c7 | 504 | rtx pat; |
505 | ||
506 | /* If this subroutine pops its own args, record that in the call insn | |
507 | if possible, for the sake of frame pointer elimination. */ | |
e93a4612 | 508 | |
66d433c7 | 509 | if (valreg) |
2ed6c343 | 510 | pat = GEN_CALL_VALUE_POP (valreg, |
941522d6 | 511 | gen_rtx_MEM (FUNCTION_MODE, funexp), |
dd837bff | 512 | rounded_stack_size_rtx, next_arg_reg, n_pop); |
66d433c7 | 513 | else |
2ed6c343 | 514 | pat = GEN_CALL_POP (gen_rtx_MEM (FUNCTION_MODE, funexp), |
dd837bff | 515 | rounded_stack_size_rtx, next_arg_reg, n_pop); |
66d433c7 | 516 | |
517 | emit_call_insn (pat); | |
518 | already_popped = 1; | |
519 | } | |
520 | else | |
521 | #endif | |
66d433c7 | 522 | |
60ecc450 | 523 | #if defined (HAVE_sibcall) && defined (HAVE_sibcall_value) |
524 | if ((ecf_flags & ECF_SIBCALL) | |
525 | && HAVE_sibcall && HAVE_sibcall_value) | |
526 | { | |
527 | if (valreg) | |
2ed6c343 | 528 | emit_call_insn (GEN_SIBCALL_VALUE (valreg, |
60ecc450 | 529 | gen_rtx_MEM (FUNCTION_MODE, funexp), |
530 | rounded_stack_size_rtx, | |
531 | next_arg_reg, NULL_RTX)); | |
532 | else | |
2ed6c343 | 533 | emit_call_insn (GEN_SIBCALL (gen_rtx_MEM (FUNCTION_MODE, funexp), |
60ecc450 | 534 | rounded_stack_size_rtx, next_arg_reg, |
535 | struct_value_size_rtx)); | |
536 | } | |
537 | else | |
538 | #endif | |
539 | ||
66d433c7 | 540 | #if defined (HAVE_call) && defined (HAVE_call_value) |
541 | if (HAVE_call && HAVE_call_value) | |
542 | { | |
543 | if (valreg) | |
2ed6c343 | 544 | emit_call_insn (GEN_CALL_VALUE (valreg, |
941522d6 | 545 | gen_rtx_MEM (FUNCTION_MODE, funexp), |
dd837bff | 546 | rounded_stack_size_rtx, next_arg_reg, |
1e8cd5a7 | 547 | NULL_RTX)); |
66d433c7 | 548 | else |
2ed6c343 | 549 | emit_call_insn (GEN_CALL (gen_rtx_MEM (FUNCTION_MODE, funexp), |
dd837bff | 550 | rounded_stack_size_rtx, next_arg_reg, |
66d433c7 | 551 | struct_value_size_rtx)); |
552 | } | |
553 | else | |
554 | #endif | |
555 | abort (); | |
556 | ||
8866f42d | 557 | /* Find the CALL insn we just emitted. */ |
66d433c7 | 558 | for (call_insn = get_last_insn (); |
559 | call_insn && GET_CODE (call_insn) != CALL_INSN; | |
560 | call_insn = PREV_INSN (call_insn)) | |
561 | ; | |
562 | ||
563 | if (! call_insn) | |
564 | abort (); | |
565 | ||
26dfc457 | 566 | /* Mark memory as used for "pure" function call. */ |
567 | if (ecf_flags & ECF_PURE) | |
568 | { | |
569 | call_fusage = gen_rtx_EXPR_LIST (VOIDmode, | |
570 | gen_rtx_USE (VOIDmode, | |
571 | gen_rtx_MEM (BLKmode, | |
572 | gen_rtx_SCRATCH (VOIDmode))), call_fusage); | |
573 | } | |
574 | ||
79402565 | 575 | /* Put the register usage information on the CALL. If there is already |
576 | some usage information, put ours at the end. */ | |
577 | if (CALL_INSN_FUNCTION_USAGE (call_insn)) | |
578 | { | |
579 | rtx link; | |
580 | ||
581 | for (link = CALL_INSN_FUNCTION_USAGE (call_insn); XEXP (link, 1) != 0; | |
582 | link = XEXP (link, 1)) | |
583 | ; | |
584 | ||
585 | XEXP (link, 1) = call_fusage; | |
586 | } | |
587 | else | |
588 | CALL_INSN_FUNCTION_USAGE (call_insn) = call_fusage; | |
66d433c7 | 589 | |
590 | /* If this is a const call, then set the insn's unchanging bit. */ | |
26dfc457 | 591 | if (ecf_flags & (ECF_CONST | ECF_PURE)) |
66d433c7 | 592 | CONST_CALL_P (call_insn) = 1; |
593 | ||
00dd2e9e | 594 | /* If this call can't throw, attach a REG_EH_REGION reg note to that |
595 | effect. */ | |
60ecc450 | 596 | if (ecf_flags & ECF_NOTHROW) |
4e834ca8 | 597 | REG_NOTES (call_insn) = gen_rtx_EXPR_LIST (REG_EH_REGION, const0_rtx, |
00dd2e9e | 598 | REG_NOTES (call_insn)); |
599 | ||
60ecc450 | 600 | SIBLING_CALL_P (call_insn) = ((ecf_flags & ECF_SIBCALL) != 0); |
601 | ||
d1f88d00 | 602 | /* Restore this now, so that we do defer pops for this call's args |
603 | if the context of the call as a whole permits. */ | |
604 | inhibit_defer_pop = old_inhibit_defer_pop; | |
605 | ||
e39fae61 | 606 | if (n_popped > 0) |
66d433c7 | 607 | { |
608 | if (!already_popped) | |
37808e3a | 609 | CALL_INSN_FUNCTION_USAGE (call_insn) |
941522d6 | 610 | = gen_rtx_EXPR_LIST (VOIDmode, |
611 | gen_rtx_CLOBBER (VOIDmode, stack_pointer_rtx), | |
612 | CALL_INSN_FUNCTION_USAGE (call_insn)); | |
e39fae61 | 613 | rounded_stack_size -= n_popped; |
dd837bff | 614 | rounded_stack_size_rtx = GEN_INT (rounded_stack_size); |
91b70175 | 615 | stack_pointer_delta -= n_popped; |
66d433c7 | 616 | } |
617 | ||
4448f543 | 618 | if (!ACCUMULATE_OUTGOING_ARGS) |
66d433c7 | 619 | { |
4448f543 | 620 | /* If returning from the subroutine does not automatically pop the args, |
621 | we need an instruction to pop them sooner or later. | |
622 | Perhaps do it now; perhaps just record how much space to pop later. | |
623 | ||
624 | If returning from the subroutine does pop the args, indicate that the | |
625 | stack pointer will be changed. */ | |
626 | ||
4448f543 | 627 | if (rounded_stack_size != 0) |
628 | { | |
629 | if (flag_defer_pop && inhibit_defer_pop == 0 | |
26dfc457 | 630 | && !(ecf_flags & (ECF_CONST | ECF_PURE))) |
4448f543 | 631 | pending_stack_adjust += rounded_stack_size; |
632 | else | |
633 | adjust_stack (rounded_stack_size_rtx); | |
634 | } | |
66d433c7 | 635 | } |
4448f543 | 636 | /* When we accumulate outgoing args, we must avoid any stack manipulations. |
637 | Restore the stack pointer to its original value now. Usually | |
638 | ACCUMULATE_OUTGOING_ARGS targets don't get here, but there are exceptions. | |
639 | On i386 ACCUMULATE_OUTGOING_ARGS can be enabled on demand, and | |
640 | popping variants of functions exist as well. | |
641 | ||
642 | ??? We may optimize similar to defer_pop above, but it is | |
643 | probably not worthwhile. | |
644 | ||
645 | ??? It will be worthwhile to enable combine_stack_adjustments even for | |
646 | such machines. */ | |
647 | else if (n_popped) | |
648 | anti_adjust_stack (GEN_INT (n_popped)); | |
66d433c7 | 649 | } |
650 | ||
6a0e6138 | 651 | /* Determine if the function identified by NAME and FNDECL is one with |
652 | special properties we wish to know about. | |
653 | ||
654 | For example, if the function might return more than one time (setjmp), then | |
655 | set RETURNS_TWICE to a nonzero value. | |
656 | ||
dfe08167 | 657 | Similarly set LONGJMP for if the function is in the longjmp family. |
6a0e6138 | 658 | |
dfe08167 | 659 | Set MALLOC for any of the standard memory allocation functions which |
6a0e6138 | 660 | allocate from the heap. |
661 | ||
662 | Set MAY_BE_ALLOCA for any memory allocation function that might allocate | |
663 | space from the stack such as alloca. */ | |
664 | ||
dfe08167 | 665 | static int |
666 | special_function_p (fndecl, flags) | |
6a0e6138 | 667 | tree fndecl; |
dfe08167 | 668 | int flags; |
6a0e6138 | 669 | { |
dfe08167 | 670 | if (! (flags & ECF_MALLOC) |
302bf7ba | 671 | && fndecl && DECL_NAME (fndecl) |
7259f3f8 | 672 | && IDENTIFIER_LENGTH (DECL_NAME (fndecl)) <= 17 |
6a0e6138 | 673 | /* Exclude functions not at the file scope, or not `extern', |
674 | since they are not the magic functions we would otherwise | |
675 | think they are. */ | |
676 | && DECL_CONTEXT (fndecl) == NULL_TREE && TREE_PUBLIC (fndecl)) | |
677 | { | |
302bf7ba | 678 | char *name = IDENTIFIER_POINTER (DECL_NAME (fndecl)); |
6a0e6138 | 679 | char *tname = name; |
680 | ||
cc7cc47f | 681 | /* We assume that alloca will always be called by name. It |
682 | makes no sense to pass it as a pointer-to-function to | |
683 | anything that does not understand its behavior. */ | |
dfe08167 | 684 | if (((IDENTIFIER_LENGTH (DECL_NAME (fndecl)) == 6 |
685 | && name[0] == 'a' | |
686 | && ! strcmp (name, "alloca")) | |
687 | || (IDENTIFIER_LENGTH (DECL_NAME (fndecl)) == 16 | |
688 | && name[0] == '_' | |
689 | && ! strcmp (name, "__builtin_alloca")))) | |
690 | flags |= ECF_MAY_BE_ALLOCA; | |
cc7cc47f | 691 | |
6a0e6138 | 692 | /* Disregard prefix _, __ or __x. */ |
693 | if (name[0] == '_') | |
694 | { | |
695 | if (name[1] == '_' && name[2] == 'x') | |
696 | tname += 3; | |
697 | else if (name[1] == '_') | |
698 | tname += 2; | |
699 | else | |
700 | tname += 1; | |
701 | } | |
702 | ||
703 | if (tname[0] == 's') | |
704 | { | |
dfe08167 | 705 | if ((tname[1] == 'e' |
706 | && (! strcmp (tname, "setjmp") | |
707 | || ! strcmp (tname, "setjmp_syscall"))) | |
708 | || (tname[1] == 'i' | |
709 | && ! strcmp (tname, "sigsetjmp")) | |
710 | || (tname[1] == 'a' | |
711 | && ! strcmp (tname, "savectx"))) | |
712 | flags |= ECF_RETURNS_TWICE; | |
713 | ||
6a0e6138 | 714 | if (tname[1] == 'i' |
715 | && ! strcmp (tname, "siglongjmp")) | |
dfe08167 | 716 | flags |= ECF_LONGJMP; |
6a0e6138 | 717 | } |
718 | else if ((tname[0] == 'q' && tname[1] == 's' | |
719 | && ! strcmp (tname, "qsetjmp")) | |
720 | || (tname[0] == 'v' && tname[1] == 'f' | |
721 | && ! strcmp (tname, "vfork"))) | |
dfe08167 | 722 | flags |= ECF_RETURNS_TWICE; |
6a0e6138 | 723 | |
724 | else if (tname[0] == 'l' && tname[1] == 'o' | |
725 | && ! strcmp (tname, "longjmp")) | |
dfe08167 | 726 | flags |= ECF_LONGJMP; |
2f921ec9 | 727 | |
728 | else if ((tname[0] == 'f' && tname[1] == 'o' | |
729 | && ! strcmp (tname, "fork")) | |
730 | /* Linux specific: __clone. check NAME to insist on the | |
731 | leading underscores, to avoid polluting the ISO / POSIX | |
732 | namespace. */ | |
733 | || (name[0] == '_' && name[1] == '_' | |
734 | && ! strcmp (tname, "clone")) | |
735 | || (tname[0] == 'e' && tname[1] == 'x' && tname[2] == 'e' | |
736 | && tname[3] == 'c' && (tname[4] == 'l' || tname[4] == 'v') | |
737 | && (tname[5] == '\0' | |
738 | || ((tname[5] == 'p' || tname[5] == 'e') | |
739 | && tname[6] == '\0')))) | |
dfe08167 | 740 | flags |= ECF_FORK_OR_EXEC; |
2f921ec9 | 741 | |
7259f3f8 | 742 | /* Do not add any more malloc-like functions to this list, |
bdba5682 | 743 | instead mark them as malloc functions using the malloc attribute. |
744 | Note, realloc is not suitable for attribute malloc since | |
456b2d5f | 745 | it may return the same address across multiple calls. |
746 | C++ operator new is not suitable because it is not required | |
747 | to return a unique pointer; indeed, the standard placement new | |
748 | just returns its argument. */ | |
4a53ef87 | 749 | else if (TYPE_MODE (TREE_TYPE (TREE_TYPE (fndecl))) == Pmode |
750 | && (! strcmp (tname, "malloc") | |
751 | || ! strcmp (tname, "calloc") | |
752 | || ! strcmp (tname, "strdup"))) | |
dfe08167 | 753 | flags |= ECF_MALLOC; |
6a0e6138 | 754 | } |
dfe08167 | 755 | return flags; |
6a0e6138 | 756 | } |
757 | ||
dfe08167 | 758 | /* Return nonzero when tree represent call to longjmp. */ |
759 | int | |
760 | setjmp_call_p (fndecl) | |
761 | tree fndecl; | |
762 | { | |
763 | return special_function_p (fndecl, 0) & ECF_RETURNS_TWICE; | |
764 | } | |
765 | ||
766 | /* Detect flags (function attributes) from the function type node. */ | |
767 | static int | |
768 | flags_from_decl_or_type (exp) | |
769 | tree exp; | |
770 | { | |
771 | int flags = 0; | |
772 | /* ??? We can't set IS_MALLOC for function types? */ | |
773 | if (DECL_P (exp)) | |
774 | { | |
775 | /* The function exp may have the `malloc' attribute. */ | |
776 | if (DECL_P (exp) && DECL_IS_MALLOC (exp)) | |
777 | flags |= ECF_MALLOC; | |
778 | ||
26dfc457 | 779 | /* The function exp may have the `pure' attribute. */ |
780 | if (DECL_P (exp) && DECL_IS_PURE (exp)) | |
781 | flags |= ECF_PURE; | |
782 | ||
dfe08167 | 783 | if (TREE_NOTHROW (exp)) |
784 | flags |= ECF_NOTHROW; | |
785 | } | |
786 | ||
787 | if (TREE_READONLY (exp) && !TREE_THIS_VOLATILE (exp)) | |
788 | flags |= ECF_CONST; | |
789 | ||
790 | if (TREE_THIS_VOLATILE (exp)) | |
791 | flags |= ECF_NORETURN; | |
792 | ||
793 | return flags; | |
794 | } | |
795 | ||
796 | ||
6a0e6138 | 797 | /* Precompute all register parameters as described by ARGS, storing values |
798 | into fields within the ARGS array. | |
799 | ||
800 | NUM_ACTUALS indicates the total number elements in the ARGS array. | |
801 | ||
802 | Set REG_PARM_SEEN if we encounter a register parameter. */ | |
803 | ||
804 | static void | |
805 | precompute_register_parameters (num_actuals, args, reg_parm_seen) | |
806 | int num_actuals; | |
807 | struct arg_data *args; | |
808 | int *reg_parm_seen; | |
809 | { | |
810 | int i; | |
811 | ||
812 | *reg_parm_seen = 0; | |
813 | ||
814 | for (i = 0; i < num_actuals; i++) | |
815 | if (args[i].reg != 0 && ! args[i].pass_on_stack) | |
816 | { | |
817 | *reg_parm_seen = 1; | |
818 | ||
819 | if (args[i].value == 0) | |
820 | { | |
821 | push_temp_slots (); | |
822 | args[i].value = expand_expr (args[i].tree_value, NULL_RTX, | |
823 | VOIDmode, 0); | |
824 | preserve_temp_slots (args[i].value); | |
825 | pop_temp_slots (); | |
826 | ||
827 | /* ANSI doesn't require a sequence point here, | |
828 | but PCC has one, so this will avoid some problems. */ | |
829 | emit_queue (); | |
830 | } | |
831 | ||
832 | /* If we are to promote the function arg to a wider mode, | |
833 | do it now. */ | |
834 | ||
835 | if (args[i].mode != TYPE_MODE (TREE_TYPE (args[i].tree_value))) | |
836 | args[i].value | |
837 | = convert_modes (args[i].mode, | |
838 | TYPE_MODE (TREE_TYPE (args[i].tree_value)), | |
839 | args[i].value, args[i].unsignedp); | |
840 | ||
841 | /* If the value is expensive, and we are inside an appropriately | |
842 | short loop, put the value into a pseudo and then put the pseudo | |
843 | into the hard reg. | |
844 | ||
845 | For small register classes, also do this if this call uses | |
846 | register parameters. This is to avoid reload conflicts while | |
847 | loading the parameters registers. */ | |
848 | ||
849 | if ((! (GET_CODE (args[i].value) == REG | |
850 | || (GET_CODE (args[i].value) == SUBREG | |
851 | && GET_CODE (SUBREG_REG (args[i].value)) == REG))) | |
852 | && args[i].mode != BLKmode | |
853 | && rtx_cost (args[i].value, SET) > 2 | |
854 | && ((SMALL_REGISTER_CLASSES && *reg_parm_seen) | |
855 | || preserve_subexpressions_p ())) | |
856 | args[i].value = copy_to_mode_reg (args[i].mode, args[i].value); | |
857 | } | |
858 | } | |
859 | ||
4448f543 | 860 | #ifdef REG_PARM_STACK_SPACE |
6a0e6138 | 861 | |
862 | /* The argument list is the property of the called routine and it | |
863 | may clobber it. If the fixed area has been used for previous | |
864 | parameters, we must save and restore it. */ | |
f7c44134 | 865 | |
6a0e6138 | 866 | static rtx |
867 | save_fixed_argument_area (reg_parm_stack_space, argblock, | |
868 | low_to_save, high_to_save) | |
869 | int reg_parm_stack_space; | |
870 | rtx argblock; | |
871 | int *low_to_save; | |
872 | int *high_to_save; | |
873 | { | |
874 | int i; | |
875 | rtx save_area = NULL_RTX; | |
876 | ||
877 | /* Compute the boundary of the that needs to be saved, if any. */ | |
878 | #ifdef ARGS_GROW_DOWNWARD | |
879 | for (i = 0; i < reg_parm_stack_space + 1; i++) | |
880 | #else | |
881 | for (i = 0; i < reg_parm_stack_space; i++) | |
882 | #endif | |
883 | { | |
884 | if (i >= highest_outgoing_arg_in_use | |
885 | || stack_usage_map[i] == 0) | |
886 | continue; | |
887 | ||
888 | if (*low_to_save == -1) | |
889 | *low_to_save = i; | |
890 | ||
891 | *high_to_save = i; | |
892 | } | |
893 | ||
894 | if (*low_to_save >= 0) | |
895 | { | |
896 | int num_to_save = *high_to_save - *low_to_save + 1; | |
897 | enum machine_mode save_mode | |
898 | = mode_for_size (num_to_save * BITS_PER_UNIT, MODE_INT, 1); | |
899 | rtx stack_area; | |
900 | ||
901 | /* If we don't have the required alignment, must do this in BLKmode. */ | |
902 | if ((*low_to_save & (MIN (GET_MODE_SIZE (save_mode), | |
903 | BIGGEST_ALIGNMENT / UNITS_PER_WORD) - 1))) | |
904 | save_mode = BLKmode; | |
905 | ||
906 | #ifdef ARGS_GROW_DOWNWARD | |
f7c44134 | 907 | stack_area |
908 | = gen_rtx_MEM (save_mode, | |
909 | memory_address (save_mode, | |
910 | plus_constant (argblock, | |
911 | - *high_to_save))); | |
6a0e6138 | 912 | #else |
913 | stack_area = gen_rtx_MEM (save_mode, | |
914 | memory_address (save_mode, | |
915 | plus_constant (argblock, | |
916 | *low_to_save))); | |
917 | #endif | |
918 | if (save_mode == BLKmode) | |
919 | { | |
920 | save_area = assign_stack_temp (BLKmode, num_to_save, 0); | |
325d1c45 | 921 | /* Cannot use emit_block_move here because it can be done by a |
922 | library call which in turn gets into this place again and deadly | |
923 | infinite recursion happens. */ | |
47af597e | 924 | move_by_pieces (validize_mem (save_area), stack_area, num_to_save, |
325d1c45 | 925 | PARM_BOUNDARY); |
6a0e6138 | 926 | } |
927 | else | |
928 | { | |
929 | save_area = gen_reg_rtx (save_mode); | |
930 | emit_move_insn (save_area, stack_area); | |
931 | } | |
932 | } | |
933 | return save_area; | |
934 | } | |
935 | ||
936 | static void | |
937 | restore_fixed_argument_area (save_area, argblock, high_to_save, low_to_save) | |
938 | rtx save_area; | |
939 | rtx argblock; | |
940 | int high_to_save; | |
941 | int low_to_save; | |
942 | { | |
943 | enum machine_mode save_mode = GET_MODE (save_area); | |
944 | #ifdef ARGS_GROW_DOWNWARD | |
945 | rtx stack_area | |
946 | = gen_rtx_MEM (save_mode, | |
947 | memory_address (save_mode, | |
948 | plus_constant (argblock, | |
949 | - high_to_save))); | |
950 | #else | |
951 | rtx stack_area | |
952 | = gen_rtx_MEM (save_mode, | |
953 | memory_address (save_mode, | |
954 | plus_constant (argblock, | |
955 | low_to_save))); | |
956 | #endif | |
957 | ||
958 | if (save_mode != BLKmode) | |
959 | emit_move_insn (stack_area, save_area); | |
960 | else | |
47af597e | 961 | /* Cannot use emit_block_move here because it can be done by a library |
962 | call which in turn gets into this place again and deadly infinite | |
963 | recursion happens. */ | |
964 | move_by_pieces (stack_area, validize_mem (save_area), | |
325d1c45 | 965 | high_to_save - low_to_save + 1, PARM_BOUNDARY); |
6a0e6138 | 966 | } |
967 | #endif | |
968 | ||
969 | /* If any elements in ARGS refer to parameters that are to be passed in | |
970 | registers, but not in memory, and whose alignment does not permit a | |
971 | direct copy into registers. Copy the values into a group of pseudos | |
6d801f27 | 972 | which we will later copy into the appropriate hard registers. |
973 | ||
974 | Pseudos for each unaligned argument will be stored into the array | |
975 | args[argnum].aligned_regs. The caller is responsible for deallocating | |
976 | the aligned_regs array if it is nonzero. */ | |
977 | ||
6a0e6138 | 978 | static void |
979 | store_unaligned_arguments_into_pseudos (args, num_actuals) | |
980 | struct arg_data *args; | |
981 | int num_actuals; | |
982 | { | |
983 | int i, j; | |
984 | ||
985 | for (i = 0; i < num_actuals; i++) | |
986 | if (args[i].reg != 0 && ! args[i].pass_on_stack | |
987 | && args[i].mode == BLKmode | |
988 | && (TYPE_ALIGN (TREE_TYPE (args[i].tree_value)) | |
989 | < (unsigned int) MIN (BIGGEST_ALIGNMENT, BITS_PER_WORD))) | |
990 | { | |
991 | int bytes = int_size_in_bytes (TREE_TYPE (args[i].tree_value)); | |
992 | int big_endian_correction = 0; | |
993 | ||
994 | args[i].n_aligned_regs | |
995 | = args[i].partial ? args[i].partial | |
996 | : (bytes + (UNITS_PER_WORD - 1)) / UNITS_PER_WORD; | |
997 | ||
6d801f27 | 998 | args[i].aligned_regs = (rtx *) xmalloc (sizeof (rtx) |
999 | * args[i].n_aligned_regs); | |
6a0e6138 | 1000 | |
1001 | /* Structures smaller than a word are aligned to the least | |
1002 | significant byte (to the right). On a BYTES_BIG_ENDIAN machine, | |
1003 | this means we must skip the empty high order bytes when | |
1004 | calculating the bit offset. */ | |
1005 | if (BYTES_BIG_ENDIAN && bytes < UNITS_PER_WORD) | |
1006 | big_endian_correction = (BITS_PER_WORD - (bytes * BITS_PER_UNIT)); | |
1007 | ||
1008 | for (j = 0; j < args[i].n_aligned_regs; j++) | |
1009 | { | |
1010 | rtx reg = gen_reg_rtx (word_mode); | |
1011 | rtx word = operand_subword_force (args[i].value, j, BLKmode); | |
1012 | int bitsize = MIN (bytes * BITS_PER_UNIT, BITS_PER_WORD); | |
1013 | int bitalign = TYPE_ALIGN (TREE_TYPE (args[i].tree_value)); | |
1014 | ||
1015 | args[i].aligned_regs[j] = reg; | |
1016 | ||
1017 | /* There is no need to restrict this code to loading items | |
1018 | in TYPE_ALIGN sized hunks. The bitfield instructions can | |
1019 | load up entire word sized registers efficiently. | |
1020 | ||
1021 | ??? This may not be needed anymore. | |
1022 | We use to emit a clobber here but that doesn't let later | |
1023 | passes optimize the instructions we emit. By storing 0 into | |
1024 | the register later passes know the first AND to zero out the | |
1025 | bitfield being set in the register is unnecessary. The store | |
1026 | of 0 will be deleted as will at least the first AND. */ | |
1027 | ||
1028 | emit_move_insn (reg, const0_rtx); | |
1029 | ||
1030 | bytes -= bitsize / BITS_PER_UNIT; | |
1031 | store_bit_field (reg, bitsize, big_endian_correction, word_mode, | |
325d1c45 | 1032 | extract_bit_field (word, bitsize, 0, 1, NULL_RTX, |
1033 | word_mode, word_mode, bitalign, | |
6a0e6138 | 1034 | BITS_PER_WORD), |
325d1c45 | 1035 | bitalign, BITS_PER_WORD); |
6a0e6138 | 1036 | } |
1037 | } | |
1038 | } | |
1039 | ||
cb543c54 | 1040 | /* Fill in ARGS_SIZE and ARGS array based on the parameters found in |
1041 | ACTPARMS. | |
1042 | ||
1043 | NUM_ACTUALS is the total number of parameters. | |
1044 | ||
1045 | N_NAMED_ARGS is the total number of named arguments. | |
1046 | ||
1047 | FNDECL is the tree code for the target of this call (if known) | |
1048 | ||
1049 | ARGS_SO_FAR holds state needed by the target to know where to place | |
1050 | the next argument. | |
1051 | ||
1052 | REG_PARM_STACK_SPACE is the number of bytes of stack space reserved | |
1053 | for arguments which are passed in registers. | |
1054 | ||
1055 | OLD_STACK_LEVEL is a pointer to an rtx which olds the old stack level | |
1056 | and may be modified by this routine. | |
1057 | ||
dfe08167 | 1058 | OLD_PENDING_ADJ, MUST_PREALLOCATE and FLAGS are pointers to integer |
cb543c54 | 1059 | flags which may may be modified by this routine. */ |
1060 | ||
1061 | static void | |
1062 | initialize_argument_information (num_actuals, args, args_size, n_named_args, | |
1063 | actparms, fndecl, args_so_far, | |
1064 | reg_parm_stack_space, old_stack_level, | |
dfe08167 | 1065 | old_pending_adj, must_preallocate, |
7a8d641b | 1066 | ecf_flags) |
23449318 | 1067 | int num_actuals ATTRIBUTE_UNUSED; |
cb543c54 | 1068 | struct arg_data *args; |
1069 | struct args_size *args_size; | |
23449318 | 1070 | int n_named_args ATTRIBUTE_UNUSED; |
cb543c54 | 1071 | tree actparms; |
1072 | tree fndecl; | |
bbafd9d2 | 1073 | CUMULATIVE_ARGS *args_so_far; |
cb543c54 | 1074 | int reg_parm_stack_space; |
1075 | rtx *old_stack_level; | |
1076 | int *old_pending_adj; | |
1077 | int *must_preallocate; | |
dfe08167 | 1078 | int *ecf_flags; |
cb543c54 | 1079 | { |
1080 | /* 1 if scanning parms front to back, -1 if scanning back to front. */ | |
1081 | int inc; | |
1082 | ||
1083 | /* Count arg position in order args appear. */ | |
1084 | int argpos; | |
1085 | ||
9d855d2f | 1086 | struct args_size alignment_pad; |
cb543c54 | 1087 | int i; |
1088 | tree p; | |
1089 | ||
1090 | args_size->constant = 0; | |
1091 | args_size->var = 0; | |
1092 | ||
1093 | /* In this loop, we consider args in the order they are written. | |
1094 | We fill up ARGS from the front or from the back if necessary | |
1095 | so that in any case the first arg to be pushed ends up at the front. */ | |
1096 | ||
4448f543 | 1097 | if (PUSH_ARGS_REVERSED) |
1098 | { | |
1099 | i = num_actuals - 1, inc = -1; | |
1100 | /* In this case, must reverse order of args | |
1101 | so that we compute and push the last arg first. */ | |
1102 | } | |
1103 | else | |
1104 | { | |
1105 | i = 0, inc = 1; | |
1106 | } | |
cb543c54 | 1107 | |
1108 | /* I counts args in order (to be) pushed; ARGPOS counts in order written. */ | |
1109 | for (p = actparms, argpos = 0; p; p = TREE_CHAIN (p), i += inc, argpos++) | |
1110 | { | |
1111 | tree type = TREE_TYPE (TREE_VALUE (p)); | |
1112 | int unsignedp; | |
1113 | enum machine_mode mode; | |
1114 | ||
1115 | args[i].tree_value = TREE_VALUE (p); | |
1116 | ||
1117 | /* Replace erroneous argument with constant zero. */ | |
4b72716d | 1118 | if (type == error_mark_node || !COMPLETE_TYPE_P (type)) |
cb543c54 | 1119 | args[i].tree_value = integer_zero_node, type = integer_type_node; |
1120 | ||
1121 | /* If TYPE is a transparent union, pass things the way we would | |
1122 | pass the first field of the union. We have already verified that | |
1123 | the modes are the same. */ | |
851dfbff | 1124 | if (TREE_CODE (type) == UNION_TYPE && TYPE_TRANSPARENT_UNION (type)) |
cb543c54 | 1125 | type = TREE_TYPE (TYPE_FIELDS (type)); |
1126 | ||
1127 | /* Decide where to pass this arg. | |
1128 | ||
1129 | args[i].reg is nonzero if all or part is passed in registers. | |
1130 | ||
1131 | args[i].partial is nonzero if part but not all is passed in registers, | |
1132 | and the exact value says how many words are passed in registers. | |
1133 | ||
1134 | args[i].pass_on_stack is nonzero if the argument must at least be | |
1135 | computed on the stack. It may then be loaded back into registers | |
1136 | if args[i].reg is nonzero. | |
1137 | ||
1138 | These decisions are driven by the FUNCTION_... macros and must agree | |
1139 | with those made by function.c. */ | |
1140 | ||
1141 | /* See if this argument should be passed by invisible reference. */ | |
1142 | if ((TREE_CODE (TYPE_SIZE (type)) != INTEGER_CST | |
1143 | && contains_placeholder_p (TYPE_SIZE (type))) | |
1144 | || TREE_ADDRESSABLE (type) | |
1145 | #ifdef FUNCTION_ARG_PASS_BY_REFERENCE | |
bbafd9d2 | 1146 | || FUNCTION_ARG_PASS_BY_REFERENCE (*args_so_far, TYPE_MODE (type), |
cb543c54 | 1147 | type, argpos < n_named_args) |
1148 | #endif | |
1149 | ) | |
1150 | { | |
1151 | /* If we're compiling a thunk, pass through invisible | |
1152 | references instead of making a copy. */ | |
1153 | if (current_function_is_thunk | |
1154 | #ifdef FUNCTION_ARG_CALLEE_COPIES | |
bbafd9d2 | 1155 | || (FUNCTION_ARG_CALLEE_COPIES (*args_so_far, TYPE_MODE (type), |
cb543c54 | 1156 | type, argpos < n_named_args) |
1157 | /* If it's in a register, we must make a copy of it too. */ | |
1158 | /* ??? Is this a sufficient test? Is there a better one? */ | |
1159 | && !(TREE_CODE (args[i].tree_value) == VAR_DECL | |
1160 | && REG_P (DECL_RTL (args[i].tree_value))) | |
1161 | && ! TREE_ADDRESSABLE (type)) | |
1162 | #endif | |
1163 | ) | |
1164 | { | |
1165 | /* C++ uses a TARGET_EXPR to indicate that we want to make a | |
1166 | new object from the argument. If we are passing by | |
1167 | invisible reference, the callee will do that for us, so we | |
1168 | can strip off the TARGET_EXPR. This is not always safe, | |
1169 | but it is safe in the only case where this is a useful | |
1170 | optimization; namely, when the argument is a plain object. | |
1171 | In that case, the frontend is just asking the backend to | |
1172 | make a bitwise copy of the argument. */ | |
1173 | ||
1174 | if (TREE_CODE (args[i].tree_value) == TARGET_EXPR | |
9308e976 | 1175 | && (DECL_P (TREE_OPERAND (args[i].tree_value, 1))) |
cb543c54 | 1176 | && ! REG_P (DECL_RTL (TREE_OPERAND (args[i].tree_value, 1)))) |
1177 | args[i].tree_value = TREE_OPERAND (args[i].tree_value, 1); | |
1178 | ||
1179 | args[i].tree_value = build1 (ADDR_EXPR, | |
1180 | build_pointer_type (type), | |
1181 | args[i].tree_value); | |
1182 | type = build_pointer_type (type); | |
1183 | } | |
1184 | else | |
1185 | { | |
1186 | /* We make a copy of the object and pass the address to the | |
1187 | function being called. */ | |
1188 | rtx copy; | |
1189 | ||
4b72716d | 1190 | if (!COMPLETE_TYPE_P (type) |
cb543c54 | 1191 | || TREE_CODE (TYPE_SIZE (type)) != INTEGER_CST |
1192 | || (flag_stack_check && ! STACK_CHECK_BUILTIN | |
a0c2c45b | 1193 | && (0 < compare_tree_int (TYPE_SIZE_UNIT (type), |
1194 | STACK_CHECK_MAX_VAR_SIZE)))) | |
cb543c54 | 1195 | { |
1196 | /* This is a variable-sized object. Make space on the stack | |
1197 | for it. */ | |
1198 | rtx size_rtx = expr_size (TREE_VALUE (p)); | |
1199 | ||
1200 | if (*old_stack_level == 0) | |
1201 | { | |
1202 | emit_stack_save (SAVE_BLOCK, old_stack_level, NULL_RTX); | |
1203 | *old_pending_adj = pending_stack_adjust; | |
1204 | pending_stack_adjust = 0; | |
1205 | } | |
1206 | ||
1207 | copy = gen_rtx_MEM (BLKmode, | |
f7c44134 | 1208 | allocate_dynamic_stack_space |
1209 | (size_rtx, NULL_RTX, TYPE_ALIGN (type))); | |
1210 | set_mem_attributes (copy, type, 1); | |
cb543c54 | 1211 | } |
1212 | else | |
f7c44134 | 1213 | copy = assign_temp (type, 0, 1, 0); |
cb543c54 | 1214 | |
1215 | store_expr (args[i].tree_value, copy, 0); | |
26dfc457 | 1216 | *ecf_flags &= ~(ECF_CONST | ECF_PURE); |
cb543c54 | 1217 | |
1218 | args[i].tree_value = build1 (ADDR_EXPR, | |
1219 | build_pointer_type (type), | |
1220 | make_tree (type, copy)); | |
1221 | type = build_pointer_type (type); | |
1222 | } | |
1223 | } | |
1224 | ||
1225 | mode = TYPE_MODE (type); | |
1226 | unsignedp = TREE_UNSIGNED (type); | |
1227 | ||
1228 | #ifdef PROMOTE_FUNCTION_ARGS | |
1229 | mode = promote_mode (type, mode, &unsignedp, 1); | |
1230 | #endif | |
1231 | ||
1232 | args[i].unsignedp = unsignedp; | |
1233 | args[i].mode = mode; | |
7a8d641b | 1234 | |
0e0be288 | 1235 | args[i].reg = FUNCTION_ARG (*args_so_far, mode, type, |
1236 | argpos < n_named_args); | |
7a8d641b | 1237 | #ifdef FUNCTION_INCOMING_ARG |
1238 | /* If this is a sibling call and the machine has register windows, the | |
1239 | register window has to be unwinded before calling the routine, so | |
1240 | arguments have to go into the incoming registers. */ | |
0e0be288 | 1241 | args[i].tail_call_reg = FUNCTION_INCOMING_ARG (*args_so_far, mode, type, |
7a8d641b | 1242 | argpos < n_named_args); |
0e0be288 | 1243 | #else |
1244 | args[i].tail_call_reg = args[i].reg; | |
7a8d641b | 1245 | #endif |
7a8d641b | 1246 | |
cb543c54 | 1247 | #ifdef FUNCTION_ARG_PARTIAL_NREGS |
1248 | if (args[i].reg) | |
1249 | args[i].partial | |
bbafd9d2 | 1250 | = FUNCTION_ARG_PARTIAL_NREGS (*args_so_far, mode, type, |
cb543c54 | 1251 | argpos < n_named_args); |
1252 | #endif | |
1253 | ||
1254 | args[i].pass_on_stack = MUST_PASS_IN_STACK (mode, type); | |
1255 | ||
1256 | /* If FUNCTION_ARG returned a (parallel [(expr_list (nil) ...) ...]), | |
1257 | it means that we are to pass this arg in the register(s) designated | |
1258 | by the PARALLEL, but also to pass it in the stack. */ | |
1259 | if (args[i].reg && GET_CODE (args[i].reg) == PARALLEL | |
1260 | && XEXP (XVECEXP (args[i].reg, 0, 0), 0) == 0) | |
1261 | args[i].pass_on_stack = 1; | |
1262 | ||
1263 | /* If this is an addressable type, we must preallocate the stack | |
1264 | since we must evaluate the object into its final location. | |
1265 | ||
1266 | If this is to be passed in both registers and the stack, it is simpler | |
1267 | to preallocate. */ | |
1268 | if (TREE_ADDRESSABLE (type) | |
1269 | || (args[i].pass_on_stack && args[i].reg != 0)) | |
1270 | *must_preallocate = 1; | |
1271 | ||
1272 | /* If this is an addressable type, we cannot pre-evaluate it. Thus, | |
1273 | we cannot consider this function call constant. */ | |
1274 | if (TREE_ADDRESSABLE (type)) | |
26dfc457 | 1275 | *ecf_flags &= ~(ECF_CONST | ECF_PURE); |
cb543c54 | 1276 | |
1277 | /* Compute the stack-size of this argument. */ | |
1278 | if (args[i].reg == 0 || args[i].partial != 0 | |
1279 | || reg_parm_stack_space > 0 | |
1280 | || args[i].pass_on_stack) | |
1281 | locate_and_pad_parm (mode, type, | |
1282 | #ifdef STACK_PARMS_IN_REG_PARM_AREA | |
1283 | 1, | |
1284 | #else | |
1285 | args[i].reg != 0, | |
1286 | #endif | |
1287 | fndecl, args_size, &args[i].offset, | |
9d855d2f | 1288 | &args[i].size, &alignment_pad); |
cb543c54 | 1289 | |
1290 | #ifndef ARGS_GROW_DOWNWARD | |
1291 | args[i].slot_offset = *args_size; | |
1292 | #endif | |
1293 | ||
9d855d2f | 1294 | args[i].alignment_pad = alignment_pad; |
1295 | ||
cb543c54 | 1296 | /* If a part of the arg was put into registers, |
1297 | don't include that part in the amount pushed. */ | |
1298 | if (reg_parm_stack_space == 0 && ! args[i].pass_on_stack) | |
1299 | args[i].size.constant -= ((args[i].partial * UNITS_PER_WORD) | |
1300 | / (PARM_BOUNDARY / BITS_PER_UNIT) | |
1301 | * (PARM_BOUNDARY / BITS_PER_UNIT)); | |
1302 | ||
1303 | /* Update ARGS_SIZE, the total stack space for args so far. */ | |
1304 | ||
1305 | args_size->constant += args[i].size.constant; | |
1306 | if (args[i].size.var) | |
1307 | { | |
1308 | ADD_PARM_SIZE (*args_size, args[i].size.var); | |
1309 | } | |
1310 | ||
1311 | /* Since the slot offset points to the bottom of the slot, | |
1312 | we must record it after incrementing if the args grow down. */ | |
1313 | #ifdef ARGS_GROW_DOWNWARD | |
1314 | args[i].slot_offset = *args_size; | |
1315 | ||
1316 | args[i].slot_offset.constant = -args_size->constant; | |
1317 | if (args_size->var) | |
902de8ed | 1318 | SUB_PARM_SIZE (args[i].slot_offset, args_size->var); |
cb543c54 | 1319 | #endif |
1320 | ||
1321 | /* Increment ARGS_SO_FAR, which has info about which arg-registers | |
1322 | have been used, etc. */ | |
1323 | ||
bbafd9d2 | 1324 | FUNCTION_ARG_ADVANCE (*args_so_far, TYPE_MODE (type), type, |
cb543c54 | 1325 | argpos < n_named_args); |
1326 | } | |
1327 | } | |
1328 | ||
cc45e5e8 | 1329 | /* Update ARGS_SIZE to contain the total size for the argument block. |
1330 | Return the original constant component of the argument block's size. | |
1331 | ||
1332 | REG_PARM_STACK_SPACE holds the number of bytes of stack space reserved | |
1333 | for arguments passed in registers. */ | |
1334 | ||
1335 | static int | |
d0285dd8 | 1336 | compute_argument_block_size (reg_parm_stack_space, args_size, |
1337 | preferred_stack_boundary) | |
cc45e5e8 | 1338 | int reg_parm_stack_space; |
1339 | struct args_size *args_size; | |
d0285dd8 | 1340 | int preferred_stack_boundary ATTRIBUTE_UNUSED; |
cc45e5e8 | 1341 | { |
1342 | int unadjusted_args_size = args_size->constant; | |
1343 | ||
4448f543 | 1344 | /* For accumulate outgoing args mode we don't need to align, since the frame |
1345 | will be already aligned. Align to STACK_BOUNDARY in order to prevent | |
1346 | backends from generating missaligned frame sizes. */ | |
1347 | #ifdef STACK_BOUNDARY | |
1348 | if (ACCUMULATE_OUTGOING_ARGS && preferred_stack_boundary > STACK_BOUNDARY) | |
1349 | preferred_stack_boundary = STACK_BOUNDARY; | |
1350 | #endif | |
1351 | ||
cc45e5e8 | 1352 | /* Compute the actual size of the argument block required. The variable |
1353 | and constant sizes must be combined, the size may have to be rounded, | |
1354 | and there may be a minimum required size. */ | |
1355 | ||
1356 | if (args_size->var) | |
1357 | { | |
1358 | args_size->var = ARGS_SIZE_TREE (*args_size); | |
1359 | args_size->constant = 0; | |
1360 | ||
1361 | #ifdef PREFERRED_STACK_BOUNDARY | |
d0285dd8 | 1362 | preferred_stack_boundary /= BITS_PER_UNIT; |
1363 | if (preferred_stack_boundary > 1) | |
91b70175 | 1364 | { |
1365 | /* We don't handle this case yet. To handle it correctly we have | |
1366 | to add the delta, round and substract the delta. | |
1367 | Currently no machine description requires this support. */ | |
1368 | if (stack_pointer_delta & (preferred_stack_boundary - 1)) | |
1369 | abort(); | |
1370 | args_size->var = round_up (args_size->var, preferred_stack_boundary); | |
1371 | } | |
cc45e5e8 | 1372 | #endif |
1373 | ||
1374 | if (reg_parm_stack_space > 0) | |
1375 | { | |
1376 | args_size->var | |
1377 | = size_binop (MAX_EXPR, args_size->var, | |
902de8ed | 1378 | ssize_int (reg_parm_stack_space)); |
cc45e5e8 | 1379 | |
1380 | #ifndef OUTGOING_REG_PARM_STACK_SPACE | |
1381 | /* The area corresponding to register parameters is not to count in | |
1382 | the size of the block we need. So make the adjustment. */ | |
1383 | args_size->var | |
1384 | = size_binop (MINUS_EXPR, args_size->var, | |
902de8ed | 1385 | ssize_int (reg_parm_stack_space)); |
cc45e5e8 | 1386 | #endif |
1387 | } | |
1388 | } | |
1389 | else | |
1390 | { | |
1391 | #ifdef PREFERRED_STACK_BOUNDARY | |
d0285dd8 | 1392 | preferred_stack_boundary /= BITS_PER_UNIT; |
60ecc450 | 1393 | if (preferred_stack_boundary < 1) |
1394 | preferred_stack_boundary = 1; | |
e39fae61 | 1395 | args_size->constant = (((args_size->constant |
91b70175 | 1396 | + stack_pointer_delta |
d0285dd8 | 1397 | + preferred_stack_boundary - 1) |
1398 | / preferred_stack_boundary | |
1399 | * preferred_stack_boundary) | |
91b70175 | 1400 | - stack_pointer_delta); |
cc45e5e8 | 1401 | #endif |
1402 | ||
1403 | args_size->constant = MAX (args_size->constant, | |
1404 | reg_parm_stack_space); | |
1405 | ||
1406 | #ifdef MAYBE_REG_PARM_STACK_SPACE | |
1407 | if (reg_parm_stack_space == 0) | |
1408 | args_size->constant = 0; | |
1409 | #endif | |
1410 | ||
1411 | #ifndef OUTGOING_REG_PARM_STACK_SPACE | |
1412 | args_size->constant -= reg_parm_stack_space; | |
1413 | #endif | |
1414 | } | |
1415 | return unadjusted_args_size; | |
1416 | } | |
1417 | ||
caa1595a | 1418 | /* Precompute parameters as needed for a function call. |
04707f1c | 1419 | |
dfe08167 | 1420 | FLAGS is mask of ECF_* constants. |
04707f1c | 1421 | |
04707f1c | 1422 | NUM_ACTUALS is the number of arguments. |
1423 | ||
1424 | ARGS is an array containing information for each argument; this routine | |
c6aec8f8 | 1425 | fills in the INITIAL_VALUE and VALUE fields for each precomputed argument. |
1426 | */ | |
04707f1c | 1427 | |
1428 | static void | |
c6aec8f8 | 1429 | precompute_arguments (flags, num_actuals, args) |
dfe08167 | 1430 | int flags; |
04707f1c | 1431 | int num_actuals; |
1432 | struct arg_data *args; | |
04707f1c | 1433 | { |
1434 | int i; | |
1435 | ||
1436 | /* If this function call is cse'able, precompute all the parameters. | |
1437 | Note that if the parameter is constructed into a temporary, this will | |
1438 | cause an additional copy because the parameter will be constructed | |
1439 | into a temporary location and then copied into the outgoing arguments. | |
1440 | If a parameter contains a call to alloca and this function uses the | |
1441 | stack, precompute the parameter. */ | |
1442 | ||
1443 | /* If we preallocated the stack space, and some arguments must be passed | |
1444 | on the stack, then we must precompute any parameter which contains a | |
1445 | function call which will store arguments on the stack. | |
1446 | Otherwise, evaluating the parameter may clobber previous parameters | |
c6aec8f8 | 1447 | which have already been stored into the stack. (we have code to avoid |
1448 | such case by saving the ougoing stack arguments, but it results in | |
1449 | worse code) */ | |
04707f1c | 1450 | |
1451 | for (i = 0; i < num_actuals; i++) | |
26dfc457 | 1452 | if ((flags & (ECF_CONST | ECF_PURE)) |
c6aec8f8 | 1453 | || calls_function (args[i].tree_value, !ACCUMULATE_OUTGOING_ARGS)) |
04707f1c | 1454 | { |
1455 | /* If this is an addressable type, we cannot pre-evaluate it. */ | |
1456 | if (TREE_ADDRESSABLE (TREE_TYPE (args[i].tree_value))) | |
1457 | abort (); | |
1458 | ||
1459 | push_temp_slots (); | |
1460 | ||
c41c7d7a | 1461 | args[i].value |
04707f1c | 1462 | = expand_expr (args[i].tree_value, NULL_RTX, VOIDmode, 0); |
1463 | ||
1464 | preserve_temp_slots (args[i].value); | |
1465 | pop_temp_slots (); | |
1466 | ||
1467 | /* ANSI doesn't require a sequence point here, | |
1468 | but PCC has one, so this will avoid some problems. */ | |
1469 | emit_queue (); | |
1470 | ||
1471 | args[i].initial_value = args[i].value | |
c41c7d7a | 1472 | = protect_from_queue (args[i].value, 0); |
04707f1c | 1473 | |
1474 | if (TYPE_MODE (TREE_TYPE (args[i].tree_value)) != args[i].mode) | |
c41c7d7a | 1475 | { |
1476 | args[i].value | |
1477 | = convert_modes (args[i].mode, | |
1478 | TYPE_MODE (TREE_TYPE (args[i].tree_value)), | |
1479 | args[i].value, args[i].unsignedp); | |
1480 | #ifdef PROMOTE_FOR_CALL_ONLY | |
1481 | /* CSE will replace this only if it contains args[i].value | |
1482 | pseudo, so convert it down to the declared mode using | |
1483 | a SUBREG. */ | |
1484 | if (GET_CODE (args[i].value) == REG | |
1485 | && GET_MODE_CLASS (args[i].mode) == MODE_INT) | |
1486 | { | |
1487 | args[i].initial_value | |
1488 | = gen_rtx_SUBREG (TYPE_MODE (TREE_TYPE (args[i].tree_value)), | |
1489 | args[i].value, 0); | |
1490 | SUBREG_PROMOTED_VAR_P (args[i].initial_value) = 1; | |
1491 | SUBREG_PROMOTED_UNSIGNED_P (args[i].initial_value) | |
1492 | = args[i].unsignedp; | |
1493 | } | |
1494 | #endif | |
1495 | } | |
04707f1c | 1496 | } |
1497 | } | |
1498 | ||
e717ffc2 | 1499 | /* Given the current state of MUST_PREALLOCATE and information about |
1500 | arguments to a function call in NUM_ACTUALS, ARGS and ARGS_SIZE, | |
1501 | compute and return the final value for MUST_PREALLOCATE. */ | |
1502 | ||
1503 | static int | |
1504 | finalize_must_preallocate (must_preallocate, num_actuals, args, args_size) | |
1505 | int must_preallocate; | |
1506 | int num_actuals; | |
1507 | struct arg_data *args; | |
1508 | struct args_size *args_size; | |
1509 | { | |
1510 | /* See if we have or want to preallocate stack space. | |
1511 | ||
1512 | If we would have to push a partially-in-regs parm | |
1513 | before other stack parms, preallocate stack space instead. | |
1514 | ||
1515 | If the size of some parm is not a multiple of the required stack | |
1516 | alignment, we must preallocate. | |
1517 | ||
1518 | If the total size of arguments that would otherwise create a copy in | |
1519 | a temporary (such as a CALL) is more than half the total argument list | |
1520 | size, preallocation is faster. | |
1521 | ||
1522 | Another reason to preallocate is if we have a machine (like the m88k) | |
1523 | where stack alignment is required to be maintained between every | |
1524 | pair of insns, not just when the call is made. However, we assume here | |
1525 | that such machines either do not have push insns (and hence preallocation | |
1526 | would occur anyway) or the problem is taken care of with | |
1527 | PUSH_ROUNDING. */ | |
1528 | ||
1529 | if (! must_preallocate) | |
1530 | { | |
1531 | int partial_seen = 0; | |
1532 | int copy_to_evaluate_size = 0; | |
1533 | int i; | |
1534 | ||
1535 | for (i = 0; i < num_actuals && ! must_preallocate; i++) | |
1536 | { | |
1537 | if (args[i].partial > 0 && ! args[i].pass_on_stack) | |
1538 | partial_seen = 1; | |
1539 | else if (partial_seen && args[i].reg == 0) | |
1540 | must_preallocate = 1; | |
1541 | ||
1542 | if (TYPE_MODE (TREE_TYPE (args[i].tree_value)) == BLKmode | |
1543 | && (TREE_CODE (args[i].tree_value) == CALL_EXPR | |
1544 | || TREE_CODE (args[i].tree_value) == TARGET_EXPR | |
1545 | || TREE_CODE (args[i].tree_value) == COND_EXPR | |
1546 | || TREE_ADDRESSABLE (TREE_TYPE (args[i].tree_value)))) | |
1547 | copy_to_evaluate_size | |
1548 | += int_size_in_bytes (TREE_TYPE (args[i].tree_value)); | |
1549 | } | |
1550 | ||
1551 | if (copy_to_evaluate_size * 2 >= args_size->constant | |
1552 | && args_size->constant > 0) | |
1553 | must_preallocate = 1; | |
1554 | } | |
1555 | return must_preallocate; | |
1556 | } | |
cc45e5e8 | 1557 | |
f3012854 | 1558 | /* If we preallocated stack space, compute the address of each argument |
1559 | and store it into the ARGS array. | |
1560 | ||
1561 | We need not ensure it is a valid memory address here; it will be | |
1562 | validized when it is used. | |
1563 | ||
1564 | ARGBLOCK is an rtx for the address of the outgoing arguments. */ | |
1565 | ||
1566 | static void | |
1567 | compute_argument_addresses (args, argblock, num_actuals) | |
1568 | struct arg_data *args; | |
1569 | rtx argblock; | |
1570 | int num_actuals; | |
1571 | { | |
1572 | if (argblock) | |
1573 | { | |
1574 | rtx arg_reg = argblock; | |
1575 | int i, arg_offset = 0; | |
1576 | ||
1577 | if (GET_CODE (argblock) == PLUS) | |
1578 | arg_reg = XEXP (argblock, 0), arg_offset = INTVAL (XEXP (argblock, 1)); | |
1579 | ||
1580 | for (i = 0; i < num_actuals; i++) | |
1581 | { | |
1582 | rtx offset = ARGS_SIZE_RTX (args[i].offset); | |
1583 | rtx slot_offset = ARGS_SIZE_RTX (args[i].slot_offset); | |
1584 | rtx addr; | |
1585 | ||
1586 | /* Skip this parm if it will not be passed on the stack. */ | |
1587 | if (! args[i].pass_on_stack && args[i].reg != 0) | |
1588 | continue; | |
1589 | ||
1590 | if (GET_CODE (offset) == CONST_INT) | |
1591 | addr = plus_constant (arg_reg, INTVAL (offset)); | |
1592 | else | |
1593 | addr = gen_rtx_PLUS (Pmode, arg_reg, offset); | |
1594 | ||
1595 | addr = plus_constant (addr, arg_offset); | |
1596 | args[i].stack = gen_rtx_MEM (args[i].mode, addr); | |
f7c44134 | 1597 | set_mem_attributes (args[i].stack, |
1598 | TREE_TYPE (args[i].tree_value), 1); | |
f3012854 | 1599 | |
1600 | if (GET_CODE (slot_offset) == CONST_INT) | |
1601 | addr = plus_constant (arg_reg, INTVAL (slot_offset)); | |
1602 | else | |
1603 | addr = gen_rtx_PLUS (Pmode, arg_reg, slot_offset); | |
1604 | ||
1605 | addr = plus_constant (addr, arg_offset); | |
1606 | args[i].stack_slot = gen_rtx_MEM (args[i].mode, addr); | |
f7c44134 | 1607 | set_mem_attributes (args[i].stack_slot, |
1608 | TREE_TYPE (args[i].tree_value), 1); | |
a9f2963b | 1609 | |
1610 | /* Function incoming arguments may overlap with sibling call | |
1611 | outgoing arguments and we cannot allow reordering of reads | |
1612 | from function arguments with stores to outgoing arguments | |
1613 | of sibling calls. */ | |
1614 | MEM_ALIAS_SET (args[i].stack) = 0; | |
1615 | MEM_ALIAS_SET (args[i].stack_slot) = 0; | |
f3012854 | 1616 | } |
1617 | } | |
1618 | } | |
1619 | ||
1620 | /* Given a FNDECL and EXP, return an rtx suitable for use as a target address | |
1621 | in a call instruction. | |
1622 | ||
1623 | FNDECL is the tree node for the target function. For an indirect call | |
1624 | FNDECL will be NULL_TREE. | |
1625 | ||
1626 | EXP is the CALL_EXPR for this call. */ | |
1627 | ||
1628 | static rtx | |
1629 | rtx_for_function_call (fndecl, exp) | |
1630 | tree fndecl; | |
1631 | tree exp; | |
1632 | { | |
1633 | rtx funexp; | |
1634 | ||
1635 | /* Get the function to call, in the form of RTL. */ | |
1636 | if (fndecl) | |
1637 | { | |
1638 | /* If this is the first use of the function, see if we need to | |
1639 | make an external definition for it. */ | |
1640 | if (! TREE_USED (fndecl)) | |
1641 | { | |
1642 | assemble_external (fndecl); | |
1643 | TREE_USED (fndecl) = 1; | |
1644 | } | |
1645 | ||
1646 | /* Get a SYMBOL_REF rtx for the function address. */ | |
1647 | funexp = XEXP (DECL_RTL (fndecl), 0); | |
1648 | } | |
1649 | else | |
1650 | /* Generate an rtx (probably a pseudo-register) for the address. */ | |
1651 | { | |
a133c27d | 1652 | rtx funaddr; |
f3012854 | 1653 | push_temp_slots (); |
a133c27d | 1654 | funaddr = funexp = |
1655 | expand_expr (TREE_OPERAND (exp, 0), NULL_RTX, VOIDmode, 0); | |
f3012854 | 1656 | pop_temp_slots (); /* FUNEXP can't be BLKmode */ |
1657 | ||
1658 | /* Check the function is executable. */ | |
1659 | if (current_function_check_memory_usage) | |
a133c27d | 1660 | { |
1661 | #ifdef POINTERS_EXTEND_UNSIGNED | |
1662 | /* It might be OK to convert funexp in place, but there's | |
1663 | a lot going on between here and when it happens naturally | |
1664 | that this seems safer. */ | |
1665 | funaddr = convert_memory_address (Pmode, funexp); | |
1666 | #endif | |
1667 | emit_library_call (chkr_check_exec_libfunc, 1, | |
1668 | VOIDmode, 1, | |
1669 | funaddr, Pmode); | |
1670 | } | |
f3012854 | 1671 | emit_queue (); |
1672 | } | |
1673 | return funexp; | |
1674 | } | |
1675 | ||
cde25025 | 1676 | /* Do the register loads required for any wholly-register parms or any |
1677 | parms which are passed both on the stack and in a register. Their | |
1678 | expressions were already evaluated. | |
1679 | ||
1680 | Mark all register-parms as living through the call, putting these USE | |
1681 | insns in the CALL_INSN_FUNCTION_USAGE field. */ | |
1682 | ||
1683 | static void | |
0e0be288 | 1684 | load_register_parameters (args, num_actuals, call_fusage, flags) |
cde25025 | 1685 | struct arg_data *args; |
1686 | int num_actuals; | |
1687 | rtx *call_fusage; | |
0e0be288 | 1688 | int flags; |
cde25025 | 1689 | { |
1690 | int i, j; | |
1691 | ||
1692 | #ifdef LOAD_ARGS_REVERSED | |
1693 | for (i = num_actuals - 1; i >= 0; i--) | |
1694 | #else | |
1695 | for (i = 0; i < num_actuals; i++) | |
1696 | #endif | |
1697 | { | |
0e0be288 | 1698 | rtx reg = ((flags & ECF_SIBCALL) |
1699 | ? args[i].tail_call_reg : args[i].reg); | |
cde25025 | 1700 | int partial = args[i].partial; |
1701 | int nregs; | |
1702 | ||
1703 | if (reg) | |
1704 | { | |
1705 | /* Set to non-negative if must move a word at a time, even if just | |
1706 | one word (e.g, partial == 1 && mode == DFmode). Set to -1 if | |
1707 | we just use a normal move insn. This value can be zero if the | |
1708 | argument is a zero size structure with no fields. */ | |
1709 | nregs = (partial ? partial | |
1710 | : (TYPE_MODE (TREE_TYPE (args[i].tree_value)) == BLKmode | |
1711 | ? ((int_size_in_bytes (TREE_TYPE (args[i].tree_value)) | |
1712 | + (UNITS_PER_WORD - 1)) / UNITS_PER_WORD) | |
1713 | : -1)); | |
1714 | ||
1715 | /* Handle calls that pass values in multiple non-contiguous | |
1716 | locations. The Irix 6 ABI has examples of this. */ | |
1717 | ||
1718 | if (GET_CODE (reg) == PARALLEL) | |
325d1c45 | 1719 | emit_group_load (reg, args[i].value, |
1720 | int_size_in_bytes (TREE_TYPE (args[i].tree_value)), | |
1721 | TYPE_ALIGN (TREE_TYPE (args[i].tree_value))); | |
cde25025 | 1722 | |
1723 | /* If simple case, just do move. If normal partial, store_one_arg | |
1724 | has already loaded the register for us. In all other cases, | |
1725 | load the register(s) from memory. */ | |
1726 | ||
1727 | else if (nregs == -1) | |
1728 | emit_move_insn (reg, args[i].value); | |
1729 | ||
1730 | /* If we have pre-computed the values to put in the registers in | |
1731 | the case of non-aligned structures, copy them in now. */ | |
1732 | ||
1733 | else if (args[i].n_aligned_regs != 0) | |
1734 | for (j = 0; j < args[i].n_aligned_regs; j++) | |
1735 | emit_move_insn (gen_rtx_REG (word_mode, REGNO (reg) + j), | |
1736 | args[i].aligned_regs[j]); | |
1737 | ||
1738 | else if (partial == 0 || args[i].pass_on_stack) | |
1739 | move_block_to_reg (REGNO (reg), | |
1740 | validize_mem (args[i].value), nregs, | |
1741 | args[i].mode); | |
1742 | ||
1743 | /* Handle calls that pass values in multiple non-contiguous | |
1744 | locations. The Irix 6 ABI has examples of this. */ | |
1745 | if (GET_CODE (reg) == PARALLEL) | |
1746 | use_group_regs (call_fusage, reg); | |
1747 | else if (nregs == -1) | |
1748 | use_reg (call_fusage, reg); | |
1749 | else | |
1750 | use_regs (call_fusage, REGNO (reg), nregs == 0 ? 1 : nregs); | |
1751 | } | |
1752 | } | |
1753 | } | |
1754 | ||
a6260fc7 | 1755 | /* Try to integrate function. See expand_inline_function for documentation |
dfe08167 | 1756 | about the parameters. */ |
1757 | ||
1758 | static rtx | |
1759 | try_to_integrate (fndecl, actparms, target, ignore, type, structure_value_addr) | |
1760 | tree fndecl; | |
1761 | tree actparms; | |
1762 | rtx target; | |
1763 | int ignore; | |
1764 | tree type; | |
1765 | rtx structure_value_addr; | |
1766 | { | |
1767 | rtx temp; | |
1768 | rtx before_call; | |
1769 | int i; | |
1770 | rtx old_stack_level = 0; | |
ca178482 | 1771 | int reg_parm_stack_space = 0; |
dfe08167 | 1772 | |
1773 | #ifdef REG_PARM_STACK_SPACE | |
1774 | #ifdef MAYBE_REG_PARM_STACK_SPACE | |
1775 | reg_parm_stack_space = MAYBE_REG_PARM_STACK_SPACE; | |
1776 | #else | |
1777 | reg_parm_stack_space = REG_PARM_STACK_SPACE (fndecl); | |
1778 | #endif | |
1779 | #endif | |
1780 | ||
1781 | before_call = get_last_insn (); | |
1782 | ||
a6260fc7 | 1783 | timevar_push (TV_INTEGRATION); |
1784 | ||
dfe08167 | 1785 | temp = expand_inline_function (fndecl, actparms, target, |
1786 | ignore, type, | |
1787 | structure_value_addr); | |
1788 | ||
a6260fc7 | 1789 | timevar_pop (TV_INTEGRATION); |
1790 | ||
dfe08167 | 1791 | /* If inlining succeeded, return. */ |
1792 | if (temp != (rtx) (HOST_WIDE_INT) - 1) | |
1793 | { | |
1794 | if (ACCUMULATE_OUTGOING_ARGS) | |
1795 | { | |
1796 | /* If the outgoing argument list must be preserved, push | |
1797 | the stack before executing the inlined function if it | |
1798 | makes any calls. */ | |
1799 | ||
1800 | for (i = reg_parm_stack_space - 1; i >= 0; i--) | |
1801 | if (i < highest_outgoing_arg_in_use && stack_usage_map[i] != 0) | |
1802 | break; | |
1803 | ||
1804 | if (stack_arg_under_construction || i >= 0) | |
1805 | { | |
1806 | rtx first_insn | |
1807 | = before_call ? NEXT_INSN (before_call) : get_insns (); | |
1808 | rtx insn = NULL_RTX, seq; | |
1809 | ||
1810 | /* Look for a call in the inline function code. | |
1811 | If DECL_SAVED_INSNS (fndecl)->outgoing_args_size is | |
1812 | nonzero then there is a call and it is not necessary | |
1813 | to scan the insns. */ | |
1814 | ||
1815 | if (DECL_SAVED_INSNS (fndecl)->outgoing_args_size == 0) | |
1816 | for (insn = first_insn; insn; insn = NEXT_INSN (insn)) | |
1817 | if (GET_CODE (insn) == CALL_INSN) | |
1818 | break; | |
1819 | ||
1820 | if (insn) | |
1821 | { | |
1822 | /* Reserve enough stack space so that the largest | |
1823 | argument list of any function call in the inline | |
1824 | function does not overlap the argument list being | |
1825 | evaluated. This is usually an overestimate because | |
1826 | allocate_dynamic_stack_space reserves space for an | |
1827 | outgoing argument list in addition to the requested | |
1828 | space, but there is no way to ask for stack space such | |
1829 | that an argument list of a certain length can be | |
1830 | safely constructed. | |
1831 | ||
1832 | Add the stack space reserved for register arguments, if | |
1833 | any, in the inline function. What is really needed is the | |
1834 | largest value of reg_parm_stack_space in the inline | |
1835 | function, but that is not available. Using the current | |
1836 | value of reg_parm_stack_space is wrong, but gives | |
1837 | correct results on all supported machines. */ | |
1838 | ||
1839 | int adjust = (DECL_SAVED_INSNS (fndecl)->outgoing_args_size | |
1840 | + reg_parm_stack_space); | |
1841 | ||
1842 | start_sequence (); | |
1843 | emit_stack_save (SAVE_BLOCK, &old_stack_level, NULL_RTX); | |
1844 | allocate_dynamic_stack_space (GEN_INT (adjust), | |
1845 | NULL_RTX, BITS_PER_UNIT); | |
1846 | seq = get_insns (); | |
1847 | end_sequence (); | |
1848 | emit_insns_before (seq, first_insn); | |
1849 | emit_stack_restore (SAVE_BLOCK, old_stack_level, NULL_RTX); | |
1850 | } | |
1851 | } | |
1852 | } | |
1853 | ||
1854 | /* If the result is equivalent to TARGET, return TARGET to simplify | |
1855 | checks in store_expr. They can be equivalent but not equal in the | |
1856 | case of a function that returns BLKmode. */ | |
1857 | if (temp != target && rtx_equal_p (temp, target)) | |
1858 | return target; | |
1859 | return temp; | |
1860 | } | |
1861 | ||
1862 | /* If inlining failed, mark FNDECL as needing to be compiled | |
1863 | separately after all. If function was declared inline, | |
1864 | give a warning. */ | |
1865 | if (DECL_INLINE (fndecl) && warn_inline && !flag_no_inline | |
1866 | && optimize > 0 && !TREE_ADDRESSABLE (fndecl)) | |
1867 | { | |
1868 | warning_with_decl (fndecl, "inlining failed in call to `%s'"); | |
1869 | warning ("called from here"); | |
1870 | } | |
1871 | mark_addressable (fndecl); | |
1872 | return (rtx) (HOST_WIDE_INT) - 1; | |
1873 | } | |
1874 | ||
92e1ef5b | 1875 | /* We need to pop PENDING_STACK_ADJUST bytes. But, if the arguments |
1876 | wouldn't fill up an even multiple of PREFERRED_UNIT_STACK_BOUNDARY | |
1877 | bytes, then we would need to push some additional bytes to pad the | |
481feae3 | 1878 | arguments. So, we compute an adjust to the stack pointer for an |
1879 | amount that will leave the stack under-aligned by UNADJUSTED_ARGS_SIZE | |
1880 | bytes. Then, when the arguments are pushed the stack will be perfectly | |
1881 | aligned. ARGS_SIZE->CONSTANT is set to the number of bytes that should | |
1882 | be popped after the call. Returns the adjustment. */ | |
92e1ef5b | 1883 | |
481feae3 | 1884 | static int |
92e1ef5b | 1885 | combine_pending_stack_adjustment_and_call (unadjusted_args_size, |
1886 | args_size, | |
1887 | preferred_unit_stack_boundary) | |
1888 | int unadjusted_args_size; | |
1889 | struct args_size *args_size; | |
1890 | int preferred_unit_stack_boundary; | |
1891 | { | |
1892 | /* The number of bytes to pop so that the stack will be | |
1893 | under-aligned by UNADJUSTED_ARGS_SIZE bytes. */ | |
1894 | HOST_WIDE_INT adjustment; | |
1895 | /* The alignment of the stack after the arguments are pushed, if we | |
1896 | just pushed the arguments without adjust the stack here. */ | |
1897 | HOST_WIDE_INT unadjusted_alignment; | |
1898 | ||
1899 | unadjusted_alignment | |
1900 | = ((stack_pointer_delta + unadjusted_args_size) | |
1901 | % preferred_unit_stack_boundary); | |
1902 | ||
1903 | /* We want to get rid of as many of the PENDING_STACK_ADJUST bytes | |
1904 | as possible -- leaving just enough left to cancel out the | |
1905 | UNADJUSTED_ALIGNMENT. In other words, we want to ensure that the | |
1906 | PENDING_STACK_ADJUST is non-negative, and congruent to | |
1907 | -UNADJUSTED_ALIGNMENT modulo the PREFERRED_UNIT_STACK_BOUNDARY. */ | |
1908 | ||
1909 | /* Begin by trying to pop all the bytes. */ | |
1910 | unadjusted_alignment | |
1911 | = (unadjusted_alignment | |
1912 | - (pending_stack_adjust % preferred_unit_stack_boundary)); | |
1913 | adjustment = pending_stack_adjust; | |
1914 | /* Push enough additional bytes that the stack will be aligned | |
1915 | after the arguments are pushed. */ | |
1916 | if (unadjusted_alignment >= 0) | |
1917 | adjustment -= preferred_unit_stack_boundary - unadjusted_alignment; | |
1918 | else | |
1919 | adjustment += unadjusted_alignment; | |
1920 | ||
1921 | /* Now, sets ARGS_SIZE->CONSTANT so that we pop the right number of | |
1922 | bytes after the call. The right number is the entire | |
1923 | PENDING_STACK_ADJUST less our ADJUSTMENT plus the amount required | |
1924 | by the arguments in the first place. */ | |
1925 | args_size->constant | |
1926 | = pending_stack_adjust - adjustment + unadjusted_args_size; | |
1927 | ||
481feae3 | 1928 | return adjustment; |
92e1ef5b | 1929 | } |
1930 | ||
7ecc63d3 | 1931 | /* Scan X expression if it does not dereference any argument slots |
1932 | we already clobbered by tail call arguments (as noted in stored_args_map | |
1933 | bitmap). | |
1934 | Return non-zero if X expression dereferences such argument slots, | |
1935 | zero otherwise. */ | |
1936 | ||
1937 | static int | |
1938 | check_sibcall_argument_overlap_1 (x) | |
1939 | rtx x; | |
1940 | { | |
1941 | RTX_CODE code; | |
1942 | int i, j; | |
1943 | unsigned int k; | |
1944 | const char *fmt; | |
1945 | ||
1946 | if (x == NULL_RTX) | |
1947 | return 0; | |
1948 | ||
1949 | code = GET_CODE (x); | |
1950 | ||
1951 | if (code == MEM) | |
1952 | { | |
1953 | if (XEXP (x, 0) == current_function_internal_arg_pointer) | |
1954 | i = 0; | |
57679d39 | 1955 | else if (GET_CODE (XEXP (x, 0)) == PLUS |
1956 | && XEXP (XEXP (x, 0), 0) == | |
1957 | current_function_internal_arg_pointer | |
1958 | && GET_CODE (XEXP (XEXP (x, 0), 1)) == CONST_INT) | |
7ecc63d3 | 1959 | i = INTVAL (XEXP (XEXP (x, 0), 1)); |
1960 | else | |
1961 | return 0; | |
1962 | ||
1963 | for (k = 0; k < GET_MODE_SIZE (GET_MODE (x)); k++) | |
1964 | if (i + k < stored_args_map->n_bits | |
1965 | && TEST_BIT (stored_args_map, i + k)) | |
1966 | return 1; | |
1967 | ||
1968 | return 0; | |
1969 | } | |
1970 | ||
1971 | /* Scan all subexpressions. */ | |
1972 | fmt = GET_RTX_FORMAT (code); | |
1973 | for (i = 0; i < GET_RTX_LENGTH (code); i++, fmt++) | |
1974 | { | |
1975 | if (*fmt == 'e') | |
1976 | { | |
1977 | if (check_sibcall_argument_overlap_1 (XEXP (x, i))) | |
1978 | return 1; | |
1979 | } | |
1980 | else if (*fmt == 'E') | |
1981 | { | |
1982 | for (j = 0; j < XVECLEN (x, i); j++) | |
1983 | if (check_sibcall_argument_overlap_1 (XVECEXP (x, i, j))) | |
1984 | return 1; | |
1985 | } | |
1986 | } | |
1987 | return 0; | |
1988 | ||
1989 | } | |
1990 | ||
1991 | /* Scan sequence after INSN if it does not dereference any argument slots | |
1992 | we already clobbered by tail call arguments (as noted in stored_args_map | |
1993 | bitmap). Add stack slots for ARG to stored_args_map bitmap afterwards. | |
1994 | Return non-zero if sequence after INSN dereferences such argument slots, | |
1995 | zero otherwise. */ | |
1996 | ||
1997 | static int | |
1998 | check_sibcall_argument_overlap (insn, arg) | |
1999 | rtx insn; | |
2000 | struct arg_data *arg; | |
2001 | { | |
2002 | int low, high; | |
2003 | ||
2004 | if (insn == NULL_RTX) | |
2005 | insn = get_insns (); | |
2006 | else | |
2007 | insn = NEXT_INSN (insn); | |
2008 | ||
2009 | for (; insn; insn = NEXT_INSN (insn)) | |
2010 | if (INSN_P (insn) && | |
2011 | check_sibcall_argument_overlap_1 (PATTERN (insn))) | |
2012 | break; | |
2013 | ||
2014 | low = arg->offset.constant; | |
2015 | for (high = low + arg->size.constant; low < high; low++) | |
2016 | SET_BIT (stored_args_map, low); | |
2017 | return insn != NULL_RTX; | |
2018 | } | |
2019 | ||
66d433c7 | 2020 | /* Generate all the code for a function call |
2021 | and return an rtx for its value. | |
2022 | Store the value in TARGET (specified as an rtx) if convenient. | |
2023 | If the value is stored in TARGET then TARGET is returned. | |
2024 | If IGNORE is nonzero, then we ignore the value of the function call. */ | |
2025 | ||
2026 | rtx | |
4e0ff571 | 2027 | expand_call (exp, target, ignore) |
66d433c7 | 2028 | tree exp; |
2029 | rtx target; | |
2030 | int ignore; | |
66d433c7 | 2031 | { |
60ecc450 | 2032 | /* Nonzero if we are currently expanding a call. */ |
2033 | static int currently_expanding_call = 0; | |
2034 | ||
66d433c7 | 2035 | /* List of actual parameters. */ |
2036 | tree actparms = TREE_OPERAND (exp, 1); | |
2037 | /* RTX for the function to be called. */ | |
2038 | rtx funexp; | |
60ecc450 | 2039 | /* Sequence of insns to perform a tail recursive "call". */ |
2040 | rtx tail_recursion_insns = NULL_RTX; | |
2041 | /* Sequence of insns to perform a normal "call". */ | |
2042 | rtx normal_call_insns = NULL_RTX; | |
2043 | /* Sequence of insns to perform a tail recursive "call". */ | |
2044 | rtx tail_call_insns = NULL_RTX; | |
66d433c7 | 2045 | /* Data type of the function. */ |
2046 | tree funtype; | |
2047 | /* Declaration of the function being called, | |
2048 | or 0 if the function is computed (not known by name). */ | |
2049 | tree fndecl = 0; | |
2050 | char *name = 0; | |
60ecc450 | 2051 | rtx insn; |
0e0be288 | 2052 | int try_tail_call = 1; |
2053 | int try_tail_recursion = 1; | |
60ecc450 | 2054 | int pass; |
66d433c7 | 2055 | |
2056 | /* Register in which non-BLKmode value will be returned, | |
2057 | or 0 if no value or if value is BLKmode. */ | |
2058 | rtx valreg; | |
2059 | /* Address where we should return a BLKmode value; | |
2060 | 0 if value not BLKmode. */ | |
2061 | rtx structure_value_addr = 0; | |
2062 | /* Nonzero if that address is being passed by treating it as | |
2063 | an extra, implicit first parameter. Otherwise, | |
2064 | it is passed by being copied directly into struct_value_rtx. */ | |
2065 | int structure_value_addr_parm = 0; | |
2066 | /* Size of aggregate value wanted, or zero if none wanted | |
2067 | or if we are using the non-reentrant PCC calling convention | |
2068 | or expecting the value in registers. */ | |
997d68fe | 2069 | HOST_WIDE_INT struct_value_size = 0; |
66d433c7 | 2070 | /* Nonzero if called function returns an aggregate in memory PCC style, |
2071 | by returning the address of where to find it. */ | |
2072 | int pcc_struct_value = 0; | |
2073 | ||
2074 | /* Number of actual parameters in this call, including struct value addr. */ | |
2075 | int num_actuals; | |
2076 | /* Number of named args. Args after this are anonymous ones | |
2077 | and they must all go on the stack. */ | |
2078 | int n_named_args; | |
66d433c7 | 2079 | |
2080 | /* Vector of information about each argument. | |
2081 | Arguments are numbered in the order they will be pushed, | |
2082 | not the order they are written. */ | |
2083 | struct arg_data *args; | |
2084 | ||
2085 | /* Total size in bytes of all the stack-parms scanned so far. */ | |
2086 | struct args_size args_size; | |
0e0be288 | 2087 | struct args_size adjusted_args_size; |
66d433c7 | 2088 | /* Size of arguments before any adjustments (such as rounding). */ |
cc45e5e8 | 2089 | int unadjusted_args_size; |
66d433c7 | 2090 | /* Data on reg parms scanned so far. */ |
2091 | CUMULATIVE_ARGS args_so_far; | |
2092 | /* Nonzero if a reg parm has been scanned. */ | |
2093 | int reg_parm_seen; | |
a50ca374 | 2094 | /* Nonzero if this is an indirect function call. */ |
66d433c7 | 2095 | |
2096 | /* Nonzero if we must avoid push-insns in the args for this call. | |
2097 | If stack space is allocated for register parameters, but not by the | |
2098 | caller, then it is preallocated in the fixed part of the stack frame. | |
2099 | So the entire argument block must then be preallocated (i.e., we | |
2100 | ignore PUSH_ROUNDING in that case). */ | |
2101 | ||
4448f543 | 2102 | int must_preallocate = !PUSH_ARGS; |
66d433c7 | 2103 | |
eb2f80f3 | 2104 | /* Size of the stack reserved for parameter registers. */ |
2d7187c2 | 2105 | int reg_parm_stack_space = 0; |
2106 | ||
66d433c7 | 2107 | /* Address of space preallocated for stack parms |
2108 | (on machines that lack push insns), or 0 if space not preallocated. */ | |
2109 | rtx argblock = 0; | |
2110 | ||
dfe08167 | 2111 | /* Mask of ECF_ flags. */ |
2112 | int flags = 0; | |
66d433c7 | 2113 | /* Nonzero if this is a call to an inline function. */ |
2114 | int is_integrable = 0; | |
4448f543 | 2115 | #ifdef REG_PARM_STACK_SPACE |
66d433c7 | 2116 | /* Define the boundary of the register parm stack space that needs to be |
2117 | save, if any. */ | |
2118 | int low_to_save = -1, high_to_save; | |
2119 | rtx save_area = 0; /* Place that it is saved */ | |
2120 | #endif | |
2121 | ||
66d433c7 | 2122 | int initial_highest_arg_in_use = highest_outgoing_arg_in_use; |
2123 | char *initial_stack_usage_map = stack_usage_map; | |
ef2c4a29 | 2124 | int old_stack_arg_under_construction = 0; |
66d433c7 | 2125 | |
2126 | rtx old_stack_level = 0; | |
65dccdb1 | 2127 | int old_pending_adj = 0; |
66d433c7 | 2128 | int old_inhibit_defer_pop = inhibit_defer_pop; |
91b70175 | 2129 | int old_stack_allocated; |
60ecc450 | 2130 | rtx call_fusage; |
66d433c7 | 2131 | register tree p; |
cde25025 | 2132 | register int i; |
92e1ef5b | 2133 | /* The alignment of the stack, in bits. */ |
2134 | HOST_WIDE_INT preferred_stack_boundary; | |
2135 | /* The alignment of the stack, in bytes. */ | |
2136 | HOST_WIDE_INT preferred_unit_stack_boundary; | |
66d433c7 | 2137 | |
7cc85421 | 2138 | /* The value of the function call can be put in a hard register. But |
2139 | if -fcheck-memory-usage, code which invokes functions (and thus | |
2140 | damages some hard registers) can be inserted before using the value. | |
2141 | So, target is always a pseudo-register in that case. */ | |
efea460c | 2142 | if (current_function_check_memory_usage) |
7cc85421 | 2143 | target = 0; |
2144 | ||
dfe08167 | 2145 | /* See if this is "nothrow" function call. */ |
2146 | if (TREE_NOTHROW (exp)) | |
2147 | flags |= ECF_NOTHROW; | |
2148 | ||
66d433c7 | 2149 | /* See if we can find a DECL-node for the actual function. |
2150 | As a result, decide whether this is a call to an integrable function. */ | |
2151 | ||
97a1590b | 2152 | fndecl = get_callee_fndecl (exp); |
2153 | if (fndecl) | |
66d433c7 | 2154 | { |
97a1590b | 2155 | if (!flag_no_inline |
2156 | && fndecl != current_function_decl | |
2157 | && DECL_INLINE (fndecl) | |
2158 | && DECL_SAVED_INSNS (fndecl) | |
2159 | && DECL_SAVED_INSNS (fndecl)->inlinable) | |
2160 | is_integrable = 1; | |
2161 | else if (! TREE_ADDRESSABLE (fndecl)) | |
66d433c7 | 2162 | { |
97a1590b | 2163 | /* In case this function later becomes inlinable, |
2164 | record that there was already a non-inline call to it. | |
66d433c7 | 2165 | |
97a1590b | 2166 | Use abstraction instead of setting TREE_ADDRESSABLE |
2167 | directly. */ | |
2168 | if (DECL_INLINE (fndecl) && warn_inline && !flag_no_inline | |
2169 | && optimize > 0) | |
2170 | { | |
2171 | warning_with_decl (fndecl, "can't inline call to `%s'"); | |
2172 | warning ("called from here"); | |
66d433c7 | 2173 | } |
97a1590b | 2174 | mark_addressable (fndecl); |
66d433c7 | 2175 | } |
97a1590b | 2176 | |
2177 | flags |= flags_from_decl_or_type (fndecl); | |
66d433c7 | 2178 | } |
2179 | ||
09220868 | 2180 | /* If we don't have specific function to call, see if we have a |
dfe08167 | 2181 | attributes set in the type. */ |
97a1590b | 2182 | else |
2183 | { | |
2184 | p = TREE_OPERAND (exp, 0); | |
2185 | flags |= flags_from_decl_or_type (TREE_TYPE (TREE_TYPE (p))); | |
2186 | } | |
09220868 | 2187 | |
2d7187c2 | 2188 | #ifdef REG_PARM_STACK_SPACE |
2189 | #ifdef MAYBE_REG_PARM_STACK_SPACE | |
2190 | reg_parm_stack_space = MAYBE_REG_PARM_STACK_SPACE; | |
2191 | #else | |
2192 | reg_parm_stack_space = REG_PARM_STACK_SPACE (fndecl); | |
2193 | #endif | |
2194 | #endif | |
2195 | ||
4448f543 | 2196 | #ifndef OUTGOING_REG_PARM_STACK_SPACE |
2197 | if (reg_parm_stack_space > 0 && PUSH_ARGS) | |
997d68fe | 2198 | must_preallocate = 1; |
2199 | #endif | |
2200 | ||
66d433c7 | 2201 | /* Warn if this value is an aggregate type, |
2202 | regardless of which calling convention we are using for it. */ | |
727a13df | 2203 | if (warn_aggregate_return && AGGREGATE_TYPE_P (TREE_TYPE (exp))) |
66d433c7 | 2204 | warning ("function call has aggregate value"); |
2205 | ||
2206 | /* Set up a place to return a structure. */ | |
2207 | ||
2208 | /* Cater to broken compilers. */ | |
2209 | if (aggregate_value_p (exp)) | |
2210 | { | |
2211 | /* This call returns a big structure. */ | |
26dfc457 | 2212 | flags &= ~(ECF_CONST | ECF_PURE); |
66d433c7 | 2213 | |
2214 | #ifdef PCC_STATIC_STRUCT_RETURN | |
f49c64ba | 2215 | { |
2216 | pcc_struct_value = 1; | |
d7e12e9e | 2217 | /* Easier than making that case work right. */ |
2218 | if (is_integrable) | |
2219 | { | |
2220 | /* In case this is a static function, note that it has been | |
2221 | used. */ | |
2222 | if (! TREE_ADDRESSABLE (fndecl)) | |
2223 | mark_addressable (fndecl); | |
2224 | is_integrable = 0; | |
2225 | } | |
f49c64ba | 2226 | } |
2227 | #else /* not PCC_STATIC_STRUCT_RETURN */ | |
2228 | { | |
2229 | struct_value_size = int_size_in_bytes (TREE_TYPE (exp)); | |
66d433c7 | 2230 | |
f49c64ba | 2231 | if (target && GET_CODE (target) == MEM) |
2232 | structure_value_addr = XEXP (target, 0); | |
2233 | else | |
2234 | { | |
0dbd1c74 | 2235 | /* Assign a temporary to hold the value. */ |
2236 | tree d; | |
66d433c7 | 2237 | |
f49c64ba | 2238 | /* For variable-sized objects, we must be called with a target |
2239 | specified. If we were to allocate space on the stack here, | |
2240 | we would have no way of knowing when to free it. */ | |
66d433c7 | 2241 | |
96bf6dcc | 2242 | if (struct_value_size < 0) |
2243 | abort (); | |
2244 | ||
0dbd1c74 | 2245 | /* This DECL is just something to feed to mark_addressable; |
2246 | it doesn't get pushed. */ | |
2247 | d = build_decl (VAR_DECL, NULL_TREE, TREE_TYPE (exp)); | |
2248 | DECL_RTL (d) = assign_temp (TREE_TYPE (exp), 1, 0, 1); | |
2249 | mark_addressable (d); | |
155b05dc | 2250 | mark_temp_addr_taken (DECL_RTL (d)); |
0dbd1c74 | 2251 | structure_value_addr = XEXP (DECL_RTL (d), 0); |
997d68fe | 2252 | TREE_USED (d) = 1; |
f49c64ba | 2253 | target = 0; |
2254 | } | |
2255 | } | |
2256 | #endif /* not PCC_STATIC_STRUCT_RETURN */ | |
66d433c7 | 2257 | } |
2258 | ||
2259 | /* If called function is inline, try to integrate it. */ | |
2260 | ||
2261 | if (is_integrable) | |
2262 | { | |
dfe08167 | 2263 | rtx temp = try_to_integrate (fndecl, actparms, target, |
2264 | ignore, TREE_TYPE (exp), | |
2265 | structure_value_addr); | |
2266 | if (temp != (rtx) (HOST_WIDE_INT) - 1) | |
2267 | return temp; | |
66d433c7 | 2268 | } |
2269 | ||
0e0be288 | 2270 | if (fndecl && DECL_NAME (fndecl)) |
2271 | name = IDENTIFIER_POINTER (DECL_NAME (fndecl)); | |
2272 | ||
2273 | /* Figure out the amount to which the stack should be aligned. */ | |
2274 | #ifdef PREFERRED_STACK_BOUNDARY | |
2275 | preferred_stack_boundary = PREFERRED_STACK_BOUNDARY; | |
2276 | #else | |
2277 | preferred_stack_boundary = STACK_BOUNDARY; | |
2278 | #endif | |
2279 | ||
2280 | /* Operand 0 is a pointer-to-function; get the type of the function. */ | |
2281 | funtype = TREE_TYPE (TREE_OPERAND (exp, 0)); | |
2282 | if (! POINTER_TYPE_P (funtype)) | |
2283 | abort (); | |
2284 | funtype = TREE_TYPE (funtype); | |
2285 | ||
2286 | /* See if this is a call to a function that can return more than once | |
2287 | or a call to longjmp or malloc. */ | |
2288 | flags |= special_function_p (fndecl, flags); | |
2289 | ||
2290 | if (flags & ECF_MAY_BE_ALLOCA) | |
2291 | current_function_calls_alloca = 1; | |
2292 | ||
2293 | /* If struct_value_rtx is 0, it means pass the address | |
2294 | as if it were an extra parameter. */ | |
2295 | if (structure_value_addr && struct_value_rtx == 0) | |
2296 | { | |
2297 | /* If structure_value_addr is a REG other than | |
2298 | virtual_outgoing_args_rtx, we can use always use it. If it | |
2299 | is not a REG, we must always copy it into a register. | |
2300 | If it is virtual_outgoing_args_rtx, we must copy it to another | |
2301 | register in some cases. */ | |
2302 | rtx temp = (GET_CODE (structure_value_addr) != REG | |
2303 | || (ACCUMULATE_OUTGOING_ARGS | |
2304 | && stack_arg_under_construction | |
2305 | && structure_value_addr == virtual_outgoing_args_rtx) | |
2306 | ? copy_addr_to_reg (structure_value_addr) | |
2307 | : structure_value_addr); | |
2308 | ||
2309 | actparms | |
2310 | = tree_cons (error_mark_node, | |
2311 | make_tree (build_pointer_type (TREE_TYPE (funtype)), | |
2312 | temp), | |
2313 | actparms); | |
2314 | structure_value_addr_parm = 1; | |
2315 | } | |
2316 | ||
2317 | /* Count the arguments and set NUM_ACTUALS. */ | |
2318 | for (p = actparms, num_actuals = 0; p; p = TREE_CHAIN (p)) | |
2319 | num_actuals++; | |
2320 | ||
2321 | /* Compute number of named args. | |
2322 | Normally, don't include the last named arg if anonymous args follow. | |
2323 | We do include the last named arg if STRICT_ARGUMENT_NAMING is nonzero. | |
2324 | (If no anonymous args follow, the result of list_length is actually | |
2325 | one too large. This is harmless.) | |
2326 | ||
2327 | If PRETEND_OUTGOING_VARARGS_NAMED is set and STRICT_ARGUMENT_NAMING is | |
2328 | zero, this machine will be able to place unnamed args that were | |
2329 | passed in registers into the stack. So treat all args as named. | |
2330 | This allows the insns emitting for a specific argument list to be | |
2331 | independent of the function declaration. | |
2332 | ||
2333 | If PRETEND_OUTGOING_VARARGS_NAMED is not set, we do not have any | |
2334 | reliable way to pass unnamed args in registers, so we must force | |
2335 | them into memory. */ | |
2336 | ||
2337 | if ((STRICT_ARGUMENT_NAMING | |
2338 | || ! PRETEND_OUTGOING_VARARGS_NAMED) | |
2339 | && TYPE_ARG_TYPES (funtype) != 0) | |
2340 | n_named_args | |
2341 | = (list_length (TYPE_ARG_TYPES (funtype)) | |
2342 | /* Don't include the last named arg. */ | |
2343 | - (STRICT_ARGUMENT_NAMING ? 0 : 1) | |
2344 | /* Count the struct value address, if it is passed as a parm. */ | |
2345 | + structure_value_addr_parm); | |
2346 | else | |
2347 | /* If we know nothing, treat all args as named. */ | |
2348 | n_named_args = num_actuals; | |
2349 | ||
2350 | /* Start updating where the next arg would go. | |
2351 | ||
2352 | On some machines (such as the PA) indirect calls have a different | |
2353 | calling convention than normal calls. The last argument in | |
2354 | INIT_CUMULATIVE_ARGS tells the backend if this is an indirect call | |
2355 | or not. */ | |
2356 | INIT_CUMULATIVE_ARGS (args_so_far, funtype, NULL_RTX, (fndecl == 0)); | |
2357 | ||
2358 | ||
2359 | /* Make a vector to hold all the information about each arg. */ | |
2360 | args = (struct arg_data *) alloca (num_actuals | |
2361 | * sizeof (struct arg_data)); | |
2362 | bzero ((char *) args, num_actuals * sizeof (struct arg_data)); | |
2363 | ||
2364 | /* Build up entries inthe ARGS array, compute the size of the arguments | |
2365 | into ARGS_SIZE, etc. */ | |
2366 | initialize_argument_information (num_actuals, args, &args_size, | |
2367 | n_named_args, actparms, fndecl, | |
2368 | &args_so_far, reg_parm_stack_space, | |
2369 | &old_stack_level, &old_pending_adj, | |
2370 | &must_preallocate, &flags); | |
2371 | ||
2372 | if (args_size.var) | |
2373 | { | |
2374 | /* If this function requires a variable-sized argument list, don't | |
2375 | try to make a cse'able block for this call. We may be able to | |
2376 | do this eventually, but it is too complicated to keep track of | |
2377 | what insns go in the cse'able block and which don't. */ | |
2378 | ||
2379 | flags &= ~(ECF_CONST | ECF_PURE); | |
2380 | must_preallocate = 1; | |
2381 | } | |
2382 | ||
2383 | /* Now make final decision about preallocating stack space. */ | |
2384 | must_preallocate = finalize_must_preallocate (must_preallocate, | |
2385 | num_actuals, args, | |
2386 | &args_size); | |
2387 | ||
2388 | /* If the structure value address will reference the stack pointer, we | |
2389 | must stabilize it. We don't need to do this if we know that we are | |
2390 | not going to adjust the stack pointer in processing this call. */ | |
2391 | ||
2392 | if (structure_value_addr | |
2393 | && (reg_mentioned_p (virtual_stack_dynamic_rtx, structure_value_addr) | |
2394 | || reg_mentioned_p (virtual_outgoing_args_rtx, | |
2395 | structure_value_addr)) | |
2396 | && (args_size.var | |
2397 | || (!ACCUMULATE_OUTGOING_ARGS && args_size.constant))) | |
2398 | structure_value_addr = copy_to_reg (structure_value_addr); | |
60ecc450 | 2399 | |
4f8af819 | 2400 | /* Tail calls can make things harder to debug, and we're traditionally |
2401 | pushed these optimizations into -O2. Don't try if we're already | |
2402 | expanding a call, as that means we're an argument. Similarly, if | |
2403 | there's pending loops or cleanups we know there's code to follow | |
23f5ea33 | 2404 | the call. |
2405 | ||
2406 | If rtx_equal_function_value_matters is false, that means we've | |
2407 | finished with regular parsing. Which means that some of the | |
2408 | machinery we use to generate tail-calls is no longer in place. | |
2409 | This is most often true of sjlj-exceptions, which we couldn't | |
2410 | tail-call to anyway. */ | |
60ecc450 | 2411 | |
0e0be288 | 2412 | if (currently_expanding_call++ != 0 |
2413 | || !flag_optimize_sibling_calls | |
2414 | || !rtx_equal_function_value_matters | |
2415 | || !stmt_loop_nest_empty () | |
2416 | || any_pending_cleanups (1) | |
2417 | || args_size.var) | |
2418 | try_tail_call = try_tail_recursion = 0; | |
2419 | ||
2420 | /* Tail recursion fails, when we are not dealing with recursive calls. */ | |
2421 | if (!try_tail_recursion | |
2422 | || TREE_CODE (TREE_OPERAND (exp, 0)) != ADDR_EXPR | |
2423 | || TREE_OPERAND (TREE_OPERAND (exp, 0), 0) != current_function_decl) | |
2424 | try_tail_recursion = 0; | |
2425 | ||
2426 | /* Rest of purposes for tail call optimizations to fail. */ | |
2427 | if ( | |
2428 | #ifdef HAVE_sibcall_epilogue | |
2429 | !HAVE_sibcall_epilogue | |
2430 | #else | |
2431 | 1 | |
2432 | #endif | |
2433 | || !try_tail_call | |
2434 | /* Doing sibling call optimization needs some work, since | |
2435 | structure_value_addr can be allocated on the stack. | |
2436 | It does not seem worth the effort since few optimizable | |
2437 | sibling calls will return a structure. */ | |
2438 | || structure_value_addr != NULL_RTX | |
2439 | /* If the register holding the address is a callee saved | |
2440 | register, then we lose. We have no way to prevent that, | |
2441 | so we only allow calls to named functions. */ | |
2442 | /* ??? This could be done by having the insn constraints | |
2443 | use a register class that is all call-clobbered. Any | |
2444 | reload insns generated to fix things up would appear | |
2445 | before the sibcall_epilogue. */ | |
2446 | || fndecl == NULL_TREE | |
2447 | || (flags & (ECF_RETURNS_TWICE | ECF_LONGJMP)) | |
2448 | || !FUNCTION_OK_FOR_SIBCALL (fndecl) | |
2449 | /* If this function requires more stack slots than the current | |
2450 | function, we cannot change it into a sibling call. */ | |
2451 | || args_size.constant > current_function_args_size | |
2452 | /* If the callee pops its own arguments, then it must pop exactly | |
2453 | the same number of arguments as the current function. */ | |
2454 | || RETURN_POPS_ARGS (fndecl, funtype, args_size.constant) | |
2455 | != RETURN_POPS_ARGS (current_function_decl, | |
2456 | TREE_TYPE (current_function_decl), | |
2457 | current_function_args_size)) | |
4b066641 | 2458 | try_tail_call = 0; |
4b066641 | 2459 | |
0e0be288 | 2460 | if (try_tail_call || try_tail_recursion) |
2461 | { | |
2462 | int end, inc; | |
2463 | actparms = NULL_TREE; | |
4f8af819 | 2464 | /* Ok, we're going to give the tail call the old college try. |
2465 | This means we're going to evaluate the function arguments | |
2466 | up to three times. There are two degrees of badness we can | |
2467 | encounter, those that can be unsaved and those that can't. | |
2468 | (See unsafe_for_reeval commentary for details.) | |
2469 | ||
2470 | Generate a new argument list. Pass safe arguments through | |
2471 | unchanged. For the easy badness wrap them in UNSAVE_EXPRs. | |
2472 | For hard badness, evaluate them now and put their resulting | |
0e0be288 | 2473 | rtx in a temporary VAR_DECL. |
2474 | ||
2475 | initialize_argument_information has ordered the array for the | |
2476 | order to be pushed, and we must remember this when reconstructing | |
2477 | the original argument orde. */ | |
1a038074 | 2478 | |
0e0be288 | 2479 | if (PUSH_ARGS_REVERSED) |
2480 | { | |
2481 | inc = 1; | |
2482 | i = 0; | |
2483 | end = num_actuals; | |
2484 | } | |
2485 | else | |
4b066641 | 2486 | { |
0e0be288 | 2487 | inc = -1; |
2488 | i = num_actuals - 1; | |
2489 | end = -1; | |
2490 | } | |
2491 | ||
2492 | for (; i != end; i += inc) | |
2493 | { | |
2494 | switch (unsafe_for_reeval (args[i].tree_value)) | |
2495 | { | |
4b066641 | 2496 | case 0: /* Safe. */ |
4b066641 | 2497 | break; |
2498 | ||
2499 | case 1: /* Mildly unsafe. */ | |
34cf2142 | 2500 | args[i].tree_value = unsave_expr (args[i].tree_value); |
4b066641 | 2501 | break; |
2502 | ||
2503 | case 2: /* Wildly unsafe. */ | |
60ecc450 | 2504 | { |
4b066641 | 2505 | tree var = build_decl (VAR_DECL, NULL_TREE, |
0e0be288 | 2506 | TREE_TYPE (args[i].tree_value)); |
2507 | DECL_RTL (var) = expand_expr (args[i].tree_value, NULL_RTX, | |
4b066641 | 2508 | VOIDmode, EXPAND_NORMAL); |
0e0be288 | 2509 | args[i].tree_value = var; |
4b066641 | 2510 | } |
2511 | break; | |
60ecc450 | 2512 | |
4b066641 | 2513 | default: |
2514 | abort (); | |
2515 | } | |
0e0be288 | 2516 | /* We need to build actparms for optimize_tail_recursion. We can |
2517 | safely trash away TREE_PURPOSE, since it is unused by this | |
2518 | function. */ | |
2519 | if (try_tail_recursion) | |
2520 | actparms = tree_cons (NULL_TREE, args[i].tree_value, actparms); | |
2521 | } | |
4f8af819 | 2522 | /* Expanding one of those dangerous arguments could have added |
2523 | cleanups, but otherwise give it a whirl. */ | |
0e0be288 | 2524 | if (any_pending_cleanups (1)) |
2525 | try_tail_call = try_tail_recursion = 0; | |
60ecc450 | 2526 | } |
2527 | ||
2528 | /* Generate a tail recursion sequence when calling ourselves. */ | |
2529 | ||
0e0be288 | 2530 | if (try_tail_recursion) |
60ecc450 | 2531 | { |
2532 | /* We want to emit any pending stack adjustments before the tail | |
2533 | recursion "call". That way we know any adjustment after the tail | |
2534 | recursion call can be ignored if we indeed use the tail recursion | |
2535 | call expansion. */ | |
2536 | int save_pending_stack_adjust = pending_stack_adjust; | |
91b70175 | 2537 | int save_stack_pointer_delta = stack_pointer_delta; |
60ecc450 | 2538 | |
2539 | /* Use a new sequence to hold any RTL we generate. We do not even | |
2540 | know if we will use this RTL yet. The final decision can not be | |
2541 | made until after RTL generation for the entire function is | |
2542 | complete. */ | |
8142f074 | 2543 | start_sequence (); |
34cf2142 | 2544 | /* If expanding any of the arguments creates cleanups, we can't |
2545 | do a tailcall. So, we'll need to pop the pending cleanups | |
2546 | list. If, however, all goes well, and there are no cleanups | |
2547 | then the call to expand_start_target_temps will have no | |
2548 | effect. */ | |
2549 | expand_start_target_temps (); | |
8142f074 | 2550 | if (optimize_tail_recursion (actparms, get_last_insn ())) |
34cf2142 | 2551 | { |
2552 | if (any_pending_cleanups (1)) | |
2553 | try_tail_call = try_tail_recursion = 0; | |
2554 | else | |
2555 | tail_recursion_insns = get_insns (); | |
2556 | } | |
2557 | expand_end_target_temps (); | |
60ecc450 | 2558 | end_sequence (); |
2559 | ||
60ecc450 | 2560 | /* Restore the original pending stack adjustment for the sibling and |
2561 | normal call cases below. */ | |
2562 | pending_stack_adjust = save_pending_stack_adjust; | |
91b70175 | 2563 | stack_pointer_delta = save_stack_pointer_delta; |
60ecc450 | 2564 | } |
2565 | ||
0e0be288 | 2566 | if (profile_arc_flag && (flags & ECF_FORK_OR_EXEC)) |
2567 | { | |
2568 | /* A fork duplicates the profile information, and an exec discards | |
2569 | it. We can't rely on fork/exec to be paired. So write out the | |
2570 | profile information we have gathered so far, and clear it. */ | |
2571 | /* ??? When Linux's __clone is called with CLONE_VM set, profiling | |
2572 | is subject to race conditions, just as with multithreaded | |
2573 | programs. */ | |
2574 | ||
2575 | emit_library_call (gen_rtx_SYMBOL_REF (Pmode, "__bb_fork_func"), 0, | |
2576 | VOIDmode, 0); | |
2577 | } | |
60ecc450 | 2578 | |
d0285dd8 | 2579 | /* Ensure current function's preferred stack boundary is at least |
2580 | what we need. We don't have to increase alignment for recursive | |
2581 | functions. */ | |
2582 | if (cfun->preferred_stack_boundary < preferred_stack_boundary | |
2583 | && fndecl != current_function_decl) | |
2584 | cfun->preferred_stack_boundary = preferred_stack_boundary; | |
2585 | ||
0e0be288 | 2586 | preferred_unit_stack_boundary = preferred_stack_boundary / BITS_PER_UNIT; |
4b066641 | 2587 | |
0e0be288 | 2588 | function_call_count++; |
1e2b2ab3 | 2589 | |
60ecc450 | 2590 | /* We want to make two insn chains; one for a sibling call, the other |
2591 | for a normal call. We will select one of the two chains after | |
2592 | initial RTL generation is complete. */ | |
2593 | for (pass = 0; pass < 2; pass++) | |
2594 | { | |
2595 | int sibcall_failure = 0; | |
2596 | /* We want to emit ay pending stack adjustments before the tail | |
2597 | recursion "call". That way we know any adjustment after the tail | |
2598 | recursion call can be ignored if we indeed use the tail recursion | |
2599 | call expansion. */ | |
9a5bbcc2 | 2600 | int save_pending_stack_adjust = 0; |
2601 | int save_stack_pointer_delta = 0; | |
60ecc450 | 2602 | rtx insns; |
7a8d641b | 2603 | rtx before_call, next_arg_reg; |
1e2b2ab3 | 2604 | |
60ecc450 | 2605 | if (pass == 0) |
2606 | { | |
0e0be288 | 2607 | if (! try_tail_call) |
60ecc450 | 2608 | continue; |
66d433c7 | 2609 | |
99445961 | 2610 | /* Emit any queued insns now; otherwise they would end up in |
2611 | only one of the alternates. */ | |
2612 | emit_queue (); | |
2613 | ||
60ecc450 | 2614 | /* State variables we need to save and restore between |
2615 | iterations. */ | |
2616 | save_pending_stack_adjust = pending_stack_adjust; | |
91b70175 | 2617 | save_stack_pointer_delta = stack_pointer_delta; |
60ecc450 | 2618 | } |
dfe08167 | 2619 | if (pass) |
2620 | flags &= ~ECF_SIBCALL; | |
2621 | else | |
2622 | flags |= ECF_SIBCALL; | |
66d433c7 | 2623 | |
60ecc450 | 2624 | /* Other state variables that we must reinitialize each time |
dfe08167 | 2625 | through the loop (that are not initialized by the loop itself). */ |
60ecc450 | 2626 | argblock = 0; |
2627 | call_fusage = 0; | |
2f921ec9 | 2628 | |
60ecc450 | 2629 | /* Start a new sequence for the normal call case. |
66d433c7 | 2630 | |
60ecc450 | 2631 | From this point on, if the sibling call fails, we want to set |
2632 | sibcall_failure instead of continuing the loop. */ | |
2633 | start_sequence (); | |
412321ce | 2634 | |
9dd2e268 | 2635 | if (pass == 0) |
2636 | { | |
2637 | /* We know at this point that there are not currently any | |
2638 | pending cleanups. If, however, in the process of evaluating | |
2639 | the arguments we were to create some, we'll need to be | |
2640 | able to get rid of them. */ | |
2641 | expand_start_target_temps (); | |
2642 | } | |
2643 | ||
60ecc450 | 2644 | /* When calling a const function, we must pop the stack args right away, |
2645 | so that the pop is deleted or moved with the call. */ | |
26dfc457 | 2646 | if (flags & (ECF_CONST | ECF_PURE)) |
60ecc450 | 2647 | NO_DEFER_POP; |
66d433c7 | 2648 | |
60ecc450 | 2649 | /* Don't let pending stack adjusts add up to too much. |
2650 | Also, do all pending adjustments now if there is any chance | |
2651 | this might be a call to alloca or if we are expanding a sibling | |
2652 | call sequence. */ | |
2653 | if (pending_stack_adjust >= 32 | |
dfe08167 | 2654 | || (pending_stack_adjust > 0 && (flags & ECF_MAY_BE_ALLOCA)) |
60ecc450 | 2655 | || pass == 0) |
2656 | do_pending_stack_adjust (); | |
66d433c7 | 2657 | |
60ecc450 | 2658 | /* Push the temporary stack slot level so that we can free any |
2659 | temporaries we make. */ | |
2660 | push_temp_slots (); | |
66d433c7 | 2661 | |
66d433c7 | 2662 | |
2d7187c2 | 2663 | #ifdef FINAL_REG_PARM_STACK_SPACE |
60ecc450 | 2664 | reg_parm_stack_space = FINAL_REG_PARM_STACK_SPACE (args_size.constant, |
2665 | args_size.var); | |
2d7187c2 | 2666 | #endif |
60ecc450 | 2667 | /* Precompute any arguments as needed. */ |
02510658 | 2668 | if (pass) |
2669 | precompute_arguments (flags, num_actuals, args); | |
66d433c7 | 2670 | |
60ecc450 | 2671 | /* Now we are about to start emitting insns that can be deleted |
2672 | if a libcall is deleted. */ | |
26dfc457 | 2673 | if (flags & (ECF_CONST | ECF_PURE | ECF_MALLOC)) |
60ecc450 | 2674 | start_sequence (); |
66d433c7 | 2675 | |
0e0be288 | 2676 | adjusted_args_size = args_size; |
481feae3 | 2677 | /* Compute the actual size of the argument block required. The variable |
2678 | and constant sizes must be combined, the size may have to be rounded, | |
2679 | and there may be a minimum required size. When generating a sibcall | |
2680 | pattern, do not round up, since we'll be re-using whatever space our | |
2681 | caller provided. */ | |
2682 | unadjusted_args_size | |
0e0be288 | 2683 | = compute_argument_block_size (reg_parm_stack_space, &adjusted_args_size, |
481feae3 | 2684 | (pass == 0 ? 0 |
2685 | : preferred_stack_boundary)); | |
2686 | ||
91b70175 | 2687 | old_stack_allocated = stack_pointer_delta - pending_stack_adjust; |
481feae3 | 2688 | |
02510658 | 2689 | /* The argument block when performing a sibling call is the |
2690 | incoming argument block. */ | |
2691 | if (pass == 0) | |
7ecc63d3 | 2692 | { |
2693 | argblock = virtual_incoming_args_rtx; | |
2694 | stored_args_map = sbitmap_alloc (args_size.constant); | |
2695 | sbitmap_zero (stored_args_map); | |
2696 | } | |
481feae3 | 2697 | |
60ecc450 | 2698 | /* If we have no actual push instructions, or shouldn't use them, |
2699 | make space for all args right now. */ | |
0e0be288 | 2700 | else if (adjusted_args_size.var != 0) |
66d433c7 | 2701 | { |
60ecc450 | 2702 | if (old_stack_level == 0) |
2703 | { | |
2704 | emit_stack_save (SAVE_BLOCK, &old_stack_level, NULL_RTX); | |
2705 | old_pending_adj = pending_stack_adjust; | |
2706 | pending_stack_adjust = 0; | |
60ecc450 | 2707 | /* stack_arg_under_construction says whether a stack arg is |
2708 | being constructed at the old stack level. Pushing the stack | |
2709 | gets a clean outgoing argument block. */ | |
2710 | old_stack_arg_under_construction = stack_arg_under_construction; | |
2711 | stack_arg_under_construction = 0; | |
60ecc450 | 2712 | } |
0e0be288 | 2713 | argblock = push_block (ARGS_SIZE_RTX (adjusted_args_size), 0, 0); |
66d433c7 | 2714 | } |
60ecc450 | 2715 | else |
2716 | { | |
2717 | /* Note that we must go through the motions of allocating an argument | |
2718 | block even if the size is zero because we may be storing args | |
2719 | in the area reserved for register arguments, which may be part of | |
2720 | the stack frame. */ | |
7221f864 | 2721 | |
0e0be288 | 2722 | int needed = adjusted_args_size.constant; |
66d433c7 | 2723 | |
60ecc450 | 2724 | /* Store the maximum argument space used. It will be pushed by |
2725 | the prologue (if ACCUMULATE_OUTGOING_ARGS, or stack overflow | |
2726 | checking). */ | |
66d433c7 | 2727 | |
60ecc450 | 2728 | if (needed > current_function_outgoing_args_size) |
2729 | current_function_outgoing_args_size = needed; | |
66d433c7 | 2730 | |
60ecc450 | 2731 | if (must_preallocate) |
2732 | { | |
4448f543 | 2733 | if (ACCUMULATE_OUTGOING_ARGS) |
2734 | { | |
02510658 | 2735 | /* Since the stack pointer will never be pushed, it is |
2736 | possible for the evaluation of a parm to clobber | |
2737 | something we have already written to the stack. | |
2738 | Since most function calls on RISC machines do not use | |
2739 | the stack, this is uncommon, but must work correctly. | |
7221f864 | 2740 | |
4448f543 | 2741 | Therefore, we save any area of the stack that was already |
02510658 | 2742 | written and that we are using. Here we set up to do this |
2743 | by making a new stack usage map from the old one. The | |
2744 | actual save will be done by store_one_arg. | |
7221f864 | 2745 | |
4448f543 | 2746 | Another approach might be to try to reorder the argument |
2747 | evaluations to avoid this conflicting stack usage. */ | |
7221f864 | 2748 | |
997d68fe | 2749 | #ifndef OUTGOING_REG_PARM_STACK_SPACE |
02510658 | 2750 | /* Since we will be writing into the entire argument area, |
2751 | the map must be allocated for its entire size, not just | |
2752 | the part that is the responsibility of the caller. */ | |
4448f543 | 2753 | needed += reg_parm_stack_space; |
66d433c7 | 2754 | #endif |
2755 | ||
2756 | #ifdef ARGS_GROW_DOWNWARD | |
4448f543 | 2757 | highest_outgoing_arg_in_use = MAX (initial_highest_arg_in_use, |
2758 | needed + 1); | |
66d433c7 | 2759 | #else |
4448f543 | 2760 | highest_outgoing_arg_in_use = MAX (initial_highest_arg_in_use, |
2761 | needed); | |
66d433c7 | 2762 | #endif |
02510658 | 2763 | stack_usage_map |
2764 | = (char *) alloca (highest_outgoing_arg_in_use); | |
66d433c7 | 2765 | |
4448f543 | 2766 | if (initial_highest_arg_in_use) |
2767 | bcopy (initial_stack_usage_map, stack_usage_map, | |
2768 | initial_highest_arg_in_use); | |
d1b03b62 | 2769 | |
4448f543 | 2770 | if (initial_highest_arg_in_use != highest_outgoing_arg_in_use) |
2771 | bzero (&stack_usage_map[initial_highest_arg_in_use], | |
2772 | (highest_outgoing_arg_in_use | |
2773 | - initial_highest_arg_in_use)); | |
2774 | needed = 0; | |
d1b03b62 | 2775 | |
02510658 | 2776 | /* The address of the outgoing argument list must not be |
2777 | copied to a register here, because argblock would be left | |
2778 | pointing to the wrong place after the call to | |
4448f543 | 2779 | allocate_dynamic_stack_space below. */ |
d1b03b62 | 2780 | |
4448f543 | 2781 | argblock = virtual_outgoing_args_rtx; |
2782 | } | |
2783 | else | |
7221f864 | 2784 | { |
4448f543 | 2785 | if (inhibit_defer_pop == 0) |
60ecc450 | 2786 | { |
4448f543 | 2787 | /* Try to reuse some or all of the pending_stack_adjust |
481feae3 | 2788 | to get this space. */ |
2789 | needed | |
2790 | = (combine_pending_stack_adjustment_and_call | |
2791 | (unadjusted_args_size, | |
0e0be288 | 2792 | &adjusted_args_size, |
481feae3 | 2793 | preferred_unit_stack_boundary)); |
2794 | ||
2795 | /* combine_pending_stack_adjustment_and_call computes | |
2796 | an adjustment before the arguments are allocated. | |
2797 | Account for them and see whether or not the stack | |
2798 | needs to go up or down. */ | |
2799 | needed = unadjusted_args_size - needed; | |
2800 | ||
2801 | if (needed < 0) | |
4448f543 | 2802 | { |
481feae3 | 2803 | /* We're releasing stack space. */ |
2804 | /* ??? We can avoid any adjustment at all if we're | |
2805 | already aligned. FIXME. */ | |
2806 | pending_stack_adjust = -needed; | |
2807 | do_pending_stack_adjust (); | |
4448f543 | 2808 | needed = 0; |
2809 | } | |
481feae3 | 2810 | else |
2811 | /* We need to allocate space. We'll do that in | |
2812 | push_block below. */ | |
2813 | pending_stack_adjust = 0; | |
60ecc450 | 2814 | } |
481feae3 | 2815 | |
2816 | /* Special case this because overhead of `push_block' in | |
2817 | this case is non-trivial. */ | |
4448f543 | 2818 | if (needed == 0) |
2819 | argblock = virtual_outgoing_args_rtx; | |
60ecc450 | 2820 | else |
4448f543 | 2821 | argblock = push_block (GEN_INT (needed), 0, 0); |
2822 | ||
02510658 | 2823 | /* We only really need to call `copy_to_reg' in the case |
2824 | where push insns are going to be used to pass ARGBLOCK | |
2825 | to a function call in ARGS. In that case, the stack | |
2826 | pointer changes value from the allocation point to the | |
2827 | call point, and hence the value of | |
2828 | VIRTUAL_OUTGOING_ARGS_RTX changes as well. But might | |
2829 | as well always do it. */ | |
4448f543 | 2830 | argblock = copy_to_reg (argblock); |
60ecc450 | 2831 | |
02510658 | 2832 | /* The save/restore code in store_one_arg handles all |
481feae3 | 2833 | cases except one: a constructor call (including a C |
2834 | function returning a BLKmode struct) to initialize | |
2835 | an argument. */ | |
02510658 | 2836 | if (stack_arg_under_construction) |
2837 | { | |
997d68fe | 2838 | #ifndef OUTGOING_REG_PARM_STACK_SPACE |
481feae3 | 2839 | rtx push_size = GEN_INT (reg_parm_stack_space |
0e0be288 | 2840 | + adjusted_args_size.constant); |
a3585b90 | 2841 | #else |
0e0be288 | 2842 | rtx push_size = GEN_INT (adjusted_args_size.constant); |
a3585b90 | 2843 | #endif |
02510658 | 2844 | if (old_stack_level == 0) |
2845 | { | |
481feae3 | 2846 | emit_stack_save (SAVE_BLOCK, &old_stack_level, |
2847 | NULL_RTX); | |
02510658 | 2848 | old_pending_adj = pending_stack_adjust; |
2849 | pending_stack_adjust = 0; | |
481feae3 | 2850 | /* stack_arg_under_construction says whether a stack |
2851 | arg is being constructed at the old stack level. | |
2852 | Pushing the stack gets a clean outgoing argument | |
2853 | block. */ | |
2854 | old_stack_arg_under_construction | |
2855 | = stack_arg_under_construction; | |
02510658 | 2856 | stack_arg_under_construction = 0; |
2857 | /* Make a new map for the new argument list. */ | |
481feae3 | 2858 | stack_usage_map = (char *) |
2859 | alloca (highest_outgoing_arg_in_use); | |
02510658 | 2860 | bzero (stack_usage_map, highest_outgoing_arg_in_use); |
2861 | highest_outgoing_arg_in_use = 0; | |
2862 | } | |
481feae3 | 2863 | allocate_dynamic_stack_space (push_size, NULL_RTX, |
2864 | BITS_PER_UNIT); | |
02510658 | 2865 | } |
481feae3 | 2866 | /* If argument evaluation might modify the stack pointer, |
2867 | copy the address of the argument list to a register. */ | |
02510658 | 2868 | for (i = 0; i < num_actuals; i++) |
2869 | if (args[i].pass_on_stack) | |
2870 | { | |
2871 | argblock = copy_addr_to_reg (argblock); | |
2872 | break; | |
2873 | } | |
4448f543 | 2874 | } |
60ecc450 | 2875 | } |
a3585b90 | 2876 | } |
a3585b90 | 2877 | |
60ecc450 | 2878 | compute_argument_addresses (args, argblock, num_actuals); |
a3585b90 | 2879 | |
dfb1ee39 | 2880 | #ifdef PREFERRED_STACK_BOUNDARY |
60ecc450 | 2881 | /* If we push args individually in reverse order, perform stack alignment |
2882 | before the first push (the last arg). */ | |
4448f543 | 2883 | if (PUSH_ARGS_REVERSED && argblock == 0 |
0e0be288 | 2884 | && adjusted_args_size.constant != unadjusted_args_size) |
ff92623c | 2885 | { |
60ecc450 | 2886 | /* When the stack adjustment is pending, we get better code |
2887 | by combining the adjustments. */ | |
92e1ef5b | 2888 | if (pending_stack_adjust |
2889 | && ! (flags & (ECF_CONST | ECF_PURE)) | |
60ecc450 | 2890 | && ! inhibit_defer_pop) |
481feae3 | 2891 | { |
2892 | pending_stack_adjust | |
2893 | = (combine_pending_stack_adjustment_and_call | |
2894 | (unadjusted_args_size, | |
0e0be288 | 2895 | &adjusted_args_size, |
481feae3 | 2896 | preferred_unit_stack_boundary)); |
2897 | do_pending_stack_adjust (); | |
2898 | } | |
60ecc450 | 2899 | else if (argblock == 0) |
0e0be288 | 2900 | anti_adjust_stack (GEN_INT (adjusted_args_size.constant |
60ecc450 | 2901 | - unadjusted_args_size)); |
60ecc450 | 2902 | } |
fa4f1f09 | 2903 | /* Now that the stack is properly aligned, pops can't safely |
2904 | be deferred during the evaluation of the arguments. */ | |
2905 | NO_DEFER_POP; | |
66d433c7 | 2906 | #endif |
2907 | ||
60ecc450 | 2908 | /* Don't try to defer pops if preallocating, not even from the first arg, |
2909 | since ARGBLOCK probably refers to the SP. */ | |
2910 | if (argblock) | |
2911 | NO_DEFER_POP; | |
66d433c7 | 2912 | |
60ecc450 | 2913 | funexp = rtx_for_function_call (fndecl, exp); |
66d433c7 | 2914 | |
60ecc450 | 2915 | /* Figure out the register where the value, if any, will come back. */ |
2916 | valreg = 0; | |
2917 | if (TYPE_MODE (TREE_TYPE (exp)) != VOIDmode | |
2918 | && ! structure_value_addr) | |
2919 | { | |
2920 | if (pcc_struct_value) | |
2921 | valreg = hard_function_value (build_pointer_type (TREE_TYPE (exp)), | |
7a8d641b | 2922 | fndecl, (pass == 0)); |
60ecc450 | 2923 | else |
7a8d641b | 2924 | valreg = hard_function_value (TREE_TYPE (exp), fndecl, (pass == 0)); |
60ecc450 | 2925 | } |
66d433c7 | 2926 | |
60ecc450 | 2927 | /* Precompute all register parameters. It isn't safe to compute anything |
2928 | once we have started filling any specific hard regs. */ | |
2929 | precompute_register_parameters (num_actuals, args, ®_parm_seen); | |
66d433c7 | 2930 | |
4448f543 | 2931 | #ifdef REG_PARM_STACK_SPACE |
60ecc450 | 2932 | /* Save the fixed argument area if it's part of the caller's frame and |
2933 | is clobbered by argument setup for this call. */ | |
02510658 | 2934 | if (ACCUMULATE_OUTGOING_ARGS && pass) |
4448f543 | 2935 | save_area = save_fixed_argument_area (reg_parm_stack_space, argblock, |
2936 | &low_to_save, &high_to_save); | |
41332f48 | 2937 | #endif |
66d433c7 | 2938 | |
60ecc450 | 2939 | /* Now store (and compute if necessary) all non-register parms. |
2940 | These come before register parms, since they can require block-moves, | |
2941 | which could clobber the registers used for register parms. | |
2942 | Parms which have partial registers are not stored here, | |
2943 | but we do preallocate space here if they want that. */ | |
66d433c7 | 2944 | |
60ecc450 | 2945 | for (i = 0; i < num_actuals; i++) |
2946 | if (args[i].reg == 0 || args[i].pass_on_stack) | |
7ecc63d3 | 2947 | { |
2948 | rtx before_arg = get_last_insn (); | |
2949 | ||
57679d39 | 2950 | if (store_one_arg (&args[i], argblock, flags, |
2951 | adjusted_args_size.var != 0, | |
2952 | reg_parm_stack_space) | |
2953 | || (pass == 0 | |
2954 | && check_sibcall_argument_overlap (before_arg, | |
2955 | &args[i]))) | |
7ecc63d3 | 2956 | sibcall_failure = 1; |
2957 | } | |
60ecc450 | 2958 | |
2959 | /* If we have a parm that is passed in registers but not in memory | |
2960 | and whose alignment does not permit a direct copy into registers, | |
2961 | make a group of pseudos that correspond to each register that we | |
2962 | will later fill. */ | |
2963 | if (STRICT_ALIGNMENT) | |
2964 | store_unaligned_arguments_into_pseudos (args, num_actuals); | |
2965 | ||
2966 | /* Now store any partially-in-registers parm. | |
2967 | This is the last place a block-move can happen. */ | |
2968 | if (reg_parm_seen) | |
2969 | for (i = 0; i < num_actuals; i++) | |
2970 | if (args[i].partial != 0 && ! args[i].pass_on_stack) | |
7ecc63d3 | 2971 | { |
2972 | rtx before_arg = get_last_insn (); | |
2973 | ||
57679d39 | 2974 | if (store_one_arg (&args[i], argblock, flags, |
2975 | adjusted_args_size.var != 0, | |
2976 | reg_parm_stack_space) | |
2977 | || (pass == 0 | |
2978 | && check_sibcall_argument_overlap (before_arg, | |
2979 | &args[i]))) | |
7ecc63d3 | 2980 | sibcall_failure = 1; |
2981 | } | |
66d433c7 | 2982 | |
dfb1ee39 | 2983 | #ifdef PREFERRED_STACK_BOUNDARY |
60ecc450 | 2984 | /* If we pushed args in forward order, perform stack alignment |
2985 | after pushing the last arg. */ | |
4448f543 | 2986 | if (!PUSH_ARGS_REVERSED && argblock == 0) |
0e0be288 | 2987 | anti_adjust_stack (GEN_INT (adjusted_args_size.constant |
60ecc450 | 2988 | - unadjusted_args_size)); |
66d433c7 | 2989 | #endif |
2990 | ||
60ecc450 | 2991 | /* If register arguments require space on the stack and stack space |
2992 | was not preallocated, allocate stack space here for arguments | |
2993 | passed in registers. */ | |
4448f543 | 2994 | #ifdef OUTGOING_REG_PARM_STACK_SPACE |
2995 | if (!ACCUMULATE_OUTGOING_ARGS | |
3f0a5e4c | 2996 | && must_preallocate == 0 && reg_parm_stack_space > 0) |
60ecc450 | 2997 | anti_adjust_stack (GEN_INT (reg_parm_stack_space)); |
985adbca | 2998 | #endif |
2999 | ||
60ecc450 | 3000 | /* Pass the function the address in which to return a |
3001 | structure value. */ | |
3002 | if (pass != 0 && structure_value_addr && ! structure_value_addr_parm) | |
3003 | { | |
3004 | emit_move_insn (struct_value_rtx, | |
3005 | force_reg (Pmode, | |
3006 | force_operand (structure_value_addr, | |
3007 | NULL_RTX))); | |
3008 | ||
3009 | /* Mark the memory for the aggregate as write-only. */ | |
3010 | if (current_function_check_memory_usage) | |
3011 | emit_library_call (chkr_set_right_libfunc, 1, | |
3012 | VOIDmode, 3, | |
3013 | structure_value_addr, ptr_mode, | |
3014 | GEN_INT (struct_value_size), | |
3015 | TYPE_MODE (sizetype), | |
3016 | GEN_INT (MEMORY_USE_WO), | |
3017 | TYPE_MODE (integer_type_node)); | |
3018 | ||
3019 | if (GET_CODE (struct_value_rtx) == REG) | |
3020 | use_reg (&call_fusage, struct_value_rtx); | |
3021 | } | |
02c736f4 | 3022 | |
60ecc450 | 3023 | funexp = prepare_call_address (funexp, fndecl, &call_fusage, |
3024 | reg_parm_seen); | |
66d433c7 | 3025 | |
0e0be288 | 3026 | load_register_parameters (args, num_actuals, &call_fusage, flags); |
60ecc450 | 3027 | |
3028 | /* Perform postincrements before actually calling the function. */ | |
3029 | emit_queue (); | |
66d433c7 | 3030 | |
60ecc450 | 3031 | /* Save a pointer to the last insn before the call, so that we can |
3032 | later safely search backwards to find the CALL_INSN. */ | |
3033 | before_call = get_last_insn (); | |
66d433c7 | 3034 | |
7a8d641b | 3035 | /* Set up next argument register. For sibling calls on machines |
3036 | with register windows this should be the incoming register. */ | |
3037 | #ifdef FUNCTION_INCOMING_ARG | |
3038 | if (pass == 0) | |
3039 | next_arg_reg = FUNCTION_INCOMING_ARG (args_so_far, VOIDmode, | |
3040 | void_type_node, 1); | |
3041 | else | |
3042 | #endif | |
3043 | next_arg_reg = FUNCTION_ARG (args_so_far, VOIDmode, | |
3044 | void_type_node, 1); | |
3045 | ||
60ecc450 | 3046 | /* All arguments and registers used for the call must be set up by |
3047 | now! */ | |
3048 | ||
fa4f1f09 | 3049 | #ifdef PREFERRED_STACK_BOUNDARY |
481feae3 | 3050 | /* Stack must be properly aligned now. */ |
3051 | if (pass && stack_pointer_delta % preferred_unit_stack_boundary) | |
01bfa89e | 3052 | abort (); |
fa4f1f09 | 3053 | #endif |
3054 | ||
60ecc450 | 3055 | /* Generate the actual call instruction. */ |
3056 | emit_call_1 (funexp, fndecl, funtype, unadjusted_args_size, | |
0e0be288 | 3057 | adjusted_args_size.constant, struct_value_size, |
7a8d641b | 3058 | next_arg_reg, valreg, old_inhibit_defer_pop, call_fusage, |
dfe08167 | 3059 | flags); |
60ecc450 | 3060 | |
91b70175 | 3061 | /* Verify that we've deallocated all the stack we used. */ |
3062 | if (pass | |
3063 | && old_stack_allocated != stack_pointer_delta - pending_stack_adjust) | |
3064 | abort(); | |
3065 | ||
60ecc450 | 3066 | /* If call is cse'able, make appropriate pair of reg-notes around it. |
3067 | Test valreg so we don't crash; may safely ignore `const' | |
3068 | if return type is void. Disable for PARALLEL return values, because | |
3069 | we have no way to move such values into a pseudo register. */ | |
c50eefd1 | 3070 | if (pass |
3071 | && (flags & (ECF_CONST | ECF_PURE)) | |
26dfc457 | 3072 | && valreg != 0 && GET_CODE (valreg) != PARALLEL) |
ea0cb7ae | 3073 | { |
60ecc450 | 3074 | rtx note = 0; |
3075 | rtx temp = gen_reg_rtx (GET_MODE (valreg)); | |
3076 | rtx insns; | |
ea0cb7ae | 3077 | |
60ecc450 | 3078 | /* Mark the return value as a pointer if needed. */ |
3079 | if (TREE_CODE (TREE_TYPE (exp)) == POINTER_TYPE) | |
80909c64 | 3080 | mark_reg_pointer (temp, TYPE_ALIGN (TREE_TYPE (TREE_TYPE (exp)))); |
60ecc450 | 3081 | |
3082 | /* Construct an "equal form" for the value which mentions all the | |
3083 | arguments in order as well as the function name. */ | |
16204096 | 3084 | for (i = 0; i < num_actuals; i++) |
3085 | note = gen_rtx_EXPR_LIST (VOIDmode, args[i].initial_value, note); | |
60ecc450 | 3086 | note = gen_rtx_EXPR_LIST (VOIDmode, funexp, note); |
ea0cb7ae | 3087 | |
60ecc450 | 3088 | insns = get_insns (); |
3089 | end_sequence (); | |
ea0cb7ae | 3090 | |
26dfc457 | 3091 | if (flags & ECF_PURE) |
3092 | note = gen_rtx_EXPR_LIST (VOIDmode, | |
3093 | gen_rtx_USE (VOIDmode, | |
3094 | gen_rtx_MEM (BLKmode, | |
3095 | gen_rtx_SCRATCH (VOIDmode))), note); | |
3096 | ||
60ecc450 | 3097 | emit_libcall_block (insns, temp, valreg, note); |
3098 | ||
3099 | valreg = temp; | |
3100 | } | |
26dfc457 | 3101 | else if (flags & (ECF_CONST | ECF_PURE)) |
60ecc450 | 3102 | { |
3103 | /* Otherwise, just write out the sequence without a note. */ | |
3104 | rtx insns = get_insns (); | |
ea0cb7ae | 3105 | |
60ecc450 | 3106 | end_sequence (); |
3107 | emit_insns (insns); | |
3108 | } | |
dfe08167 | 3109 | else if (flags & ECF_MALLOC) |
60ecc450 | 3110 | { |
3111 | rtx temp = gen_reg_rtx (GET_MODE (valreg)); | |
3112 | rtx last, insns; | |
3113 | ||
3114 | /* The return value from a malloc-like function is a pointer. */ | |
3115 | if (TREE_CODE (TREE_TYPE (exp)) == POINTER_TYPE) | |
80909c64 | 3116 | mark_reg_pointer (temp, BIGGEST_ALIGNMENT); |
60ecc450 | 3117 | |
3118 | emit_move_insn (temp, valreg); | |
3119 | ||
3120 | /* The return value from a malloc-like function can not alias | |
3121 | anything else. */ | |
3122 | last = get_last_insn (); | |
3123 | REG_NOTES (last) = | |
3124 | gen_rtx_EXPR_LIST (REG_NOALIAS, temp, REG_NOTES (last)); | |
3125 | ||
3126 | /* Write out the sequence. */ | |
3127 | insns = get_insns (); | |
3128 | end_sequence (); | |
3129 | emit_insns (insns); | |
3130 | valreg = temp; | |
3131 | } | |
66d433c7 | 3132 | |
60ecc450 | 3133 | /* For calls to `setjmp', etc., inform flow.c it should complain |
3134 | if nonvolatile values are live. For functions that cannot return, | |
3135 | inform flow that control does not fall through. */ | |
66d433c7 | 3136 | |
dfe08167 | 3137 | if ((flags & (ECF_RETURNS_TWICE | ECF_NORETURN | ECF_LONGJMP)) || pass == 0) |
02c736f4 | 3138 | { |
60ecc450 | 3139 | /* The barrier or NOTE_INSN_SETJMP note must be emitted |
3140 | immediately after the CALL_INSN. Some ports emit more | |
3141 | than just a CALL_INSN above, so we must search for it here. */ | |
66d433c7 | 3142 | |
60ecc450 | 3143 | rtx last = get_last_insn (); |
3144 | while (GET_CODE (last) != CALL_INSN) | |
3145 | { | |
3146 | last = PREV_INSN (last); | |
3147 | /* There was no CALL_INSN? */ | |
3148 | if (last == before_call) | |
3149 | abort (); | |
3150 | } | |
66d433c7 | 3151 | |
dfe08167 | 3152 | if (flags & ECF_RETURNS_TWICE) |
60ecc450 | 3153 | { |
3154 | emit_note_after (NOTE_INSN_SETJMP, last); | |
3155 | current_function_calls_setjmp = 1; | |
60ecc450 | 3156 | } |
3157 | else | |
3158 | emit_barrier_after (last); | |
3159 | } | |
66d433c7 | 3160 | |
dfe08167 | 3161 | if (flags & ECF_LONGJMP) |
0e0be288 | 3162 | current_function_calls_longjmp = 1; |
66d433c7 | 3163 | |
a3d67bb4 | 3164 | /* If this function is returning into a memory location marked as |
3165 | readonly, it means it is initializing that location. But we normally | |
3166 | treat functions as not clobbering such locations, so we need to | |
3167 | specify that this one does. */ | |
3168 | if (target != 0 && GET_CODE (target) == MEM | |
3169 | && structure_value_addr != 0 && RTX_UNCHANGING_P (target)) | |
3170 | emit_insn (gen_rtx_CLOBBER (VOIDmode, target)); | |
3171 | ||
60ecc450 | 3172 | /* If value type not void, return an rtx for the value. */ |
66d433c7 | 3173 | |
60ecc450 | 3174 | /* If there are cleanups to be called, don't use a hard reg as target. |
3175 | We need to double check this and see if it matters anymore. */ | |
4f8af819 | 3176 | if (any_pending_cleanups (1)) |
3177 | { | |
3178 | if (target && REG_P (target) | |
3179 | && REGNO (target) < FIRST_PSEUDO_REGISTER) | |
3180 | target = 0; | |
3181 | sibcall_failure = 1; | |
3182 | } | |
66d433c7 | 3183 | |
60ecc450 | 3184 | if (TYPE_MODE (TREE_TYPE (exp)) == VOIDmode |
3185 | || ignore) | |
d8946bc9 | 3186 | { |
60ecc450 | 3187 | target = const0_rtx; |
d8946bc9 | 3188 | } |
60ecc450 | 3189 | else if (structure_value_addr) |
3190 | { | |
3191 | if (target == 0 || GET_CODE (target) != MEM) | |
3192 | { | |
f7c44134 | 3193 | target |
3194 | = gen_rtx_MEM (TYPE_MODE (TREE_TYPE (exp)), | |
3195 | memory_address (TYPE_MODE (TREE_TYPE (exp)), | |
3196 | structure_value_addr)); | |
3197 | set_mem_attributes (target, exp, 1); | |
60ecc450 | 3198 | } |
3199 | } | |
3200 | else if (pcc_struct_value) | |
566d850a | 3201 | { |
60ecc450 | 3202 | /* This is the special C++ case where we need to |
3203 | know what the true target was. We take care to | |
3204 | never use this value more than once in one expression. */ | |
3205 | target = gen_rtx_MEM (TYPE_MODE (TREE_TYPE (exp)), | |
3206 | copy_to_reg (valreg)); | |
f7c44134 | 3207 | set_mem_attributes (target, exp, 1); |
566d850a | 3208 | } |
60ecc450 | 3209 | /* Handle calls that return values in multiple non-contiguous locations. |
3210 | The Irix 6 ABI has examples of this. */ | |
3211 | else if (GET_CODE (valreg) == PARALLEL) | |
3212 | { | |
3213 | int bytes = int_size_in_bytes (TREE_TYPE (exp)); | |
566d850a | 3214 | |
60ecc450 | 3215 | if (target == 0) |
3216 | { | |
3217 | target = assign_stack_temp (TYPE_MODE (TREE_TYPE (exp)), | |
3218 | bytes, 0); | |
3219 | MEM_SET_IN_STRUCT_P (target, AGGREGATE_TYPE_P (TREE_TYPE (exp))); | |
3220 | preserve_temp_slots (target); | |
3221 | } | |
3222 | ||
3223 | if (! rtx_equal_p (target, valreg)) | |
3224 | emit_group_store (target, valreg, bytes, | |
325d1c45 | 3225 | TYPE_ALIGN (TREE_TYPE (exp))); |
3226 | ||
60ecc450 | 3227 | /* We can not support sibling calls for this case. */ |
3228 | sibcall_failure = 1; | |
3229 | } | |
3230 | else if (target | |
3231 | && GET_MODE (target) == TYPE_MODE (TREE_TYPE (exp)) | |
3232 | && GET_MODE (target) == GET_MODE (valreg)) | |
3233 | { | |
3234 | /* TARGET and VALREG cannot be equal at this point because the | |
3235 | latter would not have REG_FUNCTION_VALUE_P true, while the | |
3236 | former would if it were referring to the same register. | |
3237 | ||
3238 | If they refer to the same register, this move will be a no-op, | |
3239 | except when function inlining is being done. */ | |
3240 | emit_move_insn (target, valreg); | |
3241 | } | |
3242 | else if (TYPE_MODE (TREE_TYPE (exp)) == BLKmode) | |
3243 | target = copy_blkmode_from_reg (target, valreg, TREE_TYPE (exp)); | |
3244 | else | |
3245 | target = copy_to_reg (valreg); | |
66d433c7 | 3246 | |
23eb5fa6 | 3247 | #ifdef PROMOTE_FUNCTION_RETURN |
60ecc450 | 3248 | /* If we promoted this return value, make the proper SUBREG. TARGET |
3249 | might be const0_rtx here, so be careful. */ | |
3250 | if (GET_CODE (target) == REG | |
3251 | && TYPE_MODE (TREE_TYPE (exp)) != BLKmode | |
3252 | && GET_MODE (target) != TYPE_MODE (TREE_TYPE (exp))) | |
3253 | { | |
3254 | tree type = TREE_TYPE (exp); | |
3255 | int unsignedp = TREE_UNSIGNED (type); | |
23eb5fa6 | 3256 | |
60ecc450 | 3257 | /* If we don't promote as expected, something is wrong. */ |
3258 | if (GET_MODE (target) | |
3259 | != promote_mode (type, TYPE_MODE (type), &unsignedp, 1)) | |
3260 | abort (); | |
199bbafe | 3261 | |
60ecc450 | 3262 | target = gen_rtx_SUBREG (TYPE_MODE (type), target, 0); |
3263 | SUBREG_PROMOTED_VAR_P (target) = 1; | |
3264 | SUBREG_PROMOTED_UNSIGNED_P (target) = unsignedp; | |
3265 | } | |
23eb5fa6 | 3266 | #endif |
3267 | ||
60ecc450 | 3268 | /* If size of args is variable or this was a constructor call for a stack |
3269 | argument, restore saved stack-pointer value. */ | |
66d433c7 | 3270 | |
60ecc450 | 3271 | if (old_stack_level) |
3272 | { | |
3273 | emit_stack_restore (SAVE_BLOCK, old_stack_level, NULL_RTX); | |
3274 | pending_stack_adjust = old_pending_adj; | |
60ecc450 | 3275 | stack_arg_under_construction = old_stack_arg_under_construction; |
3276 | highest_outgoing_arg_in_use = initial_highest_arg_in_use; | |
3277 | stack_usage_map = initial_stack_usage_map; | |
60ecc450 | 3278 | sibcall_failure = 1; |
3279 | } | |
02510658 | 3280 | else if (ACCUMULATE_OUTGOING_ARGS && pass) |
60ecc450 | 3281 | { |
66d433c7 | 3282 | #ifdef REG_PARM_STACK_SPACE |
60ecc450 | 3283 | if (save_area) |
3284 | { | |
3285 | restore_fixed_argument_area (save_area, argblock, | |
3286 | high_to_save, low_to_save); | |
60ecc450 | 3287 | } |
41332f48 | 3288 | #endif |
66d433c7 | 3289 | |
60ecc450 | 3290 | /* If we saved any argument areas, restore them. */ |
3291 | for (i = 0; i < num_actuals; i++) | |
3292 | if (args[i].save_area) | |
3293 | { | |
3294 | enum machine_mode save_mode = GET_MODE (args[i].save_area); | |
3295 | rtx stack_area | |
3296 | = gen_rtx_MEM (save_mode, | |
3297 | memory_address (save_mode, | |
3298 | XEXP (args[i].stack_slot, 0))); | |
3299 | ||
3300 | if (save_mode != BLKmode) | |
3301 | emit_move_insn (stack_area, args[i].save_area); | |
3302 | else | |
3303 | emit_block_move (stack_area, | |
3304 | validize_mem (args[i].save_area), | |
3305 | GEN_INT (args[i].size.constant), | |
325d1c45 | 3306 | PARM_BOUNDARY); |
60ecc450 | 3307 | } |
66d433c7 | 3308 | |
60ecc450 | 3309 | highest_outgoing_arg_in_use = initial_highest_arg_in_use; |
3310 | stack_usage_map = initial_stack_usage_map; | |
3311 | } | |
66d433c7 | 3312 | |
60ecc450 | 3313 | /* If this was alloca, record the new stack level for nonlocal gotos. |
3314 | Check for the handler slots since we might not have a save area | |
3315 | for non-local gotos. */ | |
dbd6697a | 3316 | |
dfe08167 | 3317 | if ((flags & ECF_MAY_BE_ALLOCA) && nonlocal_goto_handler_slots != 0) |
60ecc450 | 3318 | emit_stack_save (SAVE_NONLOCAL, &nonlocal_goto_stack_level, NULL_RTX); |
66d433c7 | 3319 | |
60ecc450 | 3320 | pop_temp_slots (); |
3321 | ||
3322 | /* Free up storage we no longer need. */ | |
3323 | for (i = 0; i < num_actuals; ++i) | |
3324 | if (args[i].aligned_regs) | |
3325 | free (args[i].aligned_regs); | |
3326 | ||
c931f2f0 | 3327 | if (pass == 0) |
3328 | { | |
3329 | /* Undo the fake expand_start_target_temps we did earlier. If | |
3330 | there had been any cleanups created, we've already set | |
3331 | sibcall_failure. */ | |
3332 | expand_end_target_temps (); | |
3333 | } | |
3334 | ||
60ecc450 | 3335 | insns = get_insns (); |
3336 | end_sequence (); | |
3337 | ||
3338 | if (pass == 0) | |
3339 | { | |
3340 | tail_call_insns = insns; | |
3341 | ||
7a8d641b | 3342 | /* If something prevents making this a sibling call, |
3343 | zero out the sequence. */ | |
3344 | if (sibcall_failure) | |
60ecc450 | 3345 | tail_call_insns = NULL_RTX; |
60ecc450 | 3346 | /* Restore the pending stack adjustment now that we have |
3347 | finished generating the sibling call sequence. */ | |
91b70175 | 3348 | |
60ecc450 | 3349 | pending_stack_adjust = save_pending_stack_adjust; |
91b70175 | 3350 | stack_pointer_delta = save_stack_pointer_delta; |
0e0be288 | 3351 | |
3352 | /* Prepare arg structure for next iteration. */ | |
3353 | for (i = 0 ; i < num_actuals ; i++) | |
3354 | { | |
3355 | args[i].value = 0; | |
3356 | args[i].aligned_regs = 0; | |
3357 | args[i].stack = 0; | |
3358 | } | |
7ecc63d3 | 3359 | |
3360 | sbitmap_free (stored_args_map); | |
60ecc450 | 3361 | } |
3362 | else | |
3363 | normal_call_insns = insns; | |
3364 | } | |
3365 | ||
3366 | /* The function optimize_sibling_and_tail_recursive_calls doesn't | |
3367 | handle CALL_PLACEHOLDERs inside other CALL_PLACEHOLDERs. This | |
3368 | can happen if the arguments to this function call an inline | |
3369 | function who's expansion contains another CALL_PLACEHOLDER. | |
3370 | ||
3371 | If there are any C_Ps in any of these sequences, replace them | |
3372 | with their normal call. */ | |
3373 | ||
3374 | for (insn = normal_call_insns; insn; insn = NEXT_INSN (insn)) | |
3375 | if (GET_CODE (insn) == CALL_INSN | |
3376 | && GET_CODE (PATTERN (insn)) == CALL_PLACEHOLDER) | |
3377 | replace_call_placeholder (insn, sibcall_use_normal); | |
3378 | ||
3379 | for (insn = tail_call_insns; insn; insn = NEXT_INSN (insn)) | |
3380 | if (GET_CODE (insn) == CALL_INSN | |
3381 | && GET_CODE (PATTERN (insn)) == CALL_PLACEHOLDER) | |
3382 | replace_call_placeholder (insn, sibcall_use_normal); | |
3383 | ||
3384 | for (insn = tail_recursion_insns; insn; insn = NEXT_INSN (insn)) | |
3385 | if (GET_CODE (insn) == CALL_INSN | |
3386 | && GET_CODE (PATTERN (insn)) == CALL_PLACEHOLDER) | |
3387 | replace_call_placeholder (insn, sibcall_use_normal); | |
3388 | ||
3389 | /* If this was a potential tail recursion site, then emit a | |
3390 | CALL_PLACEHOLDER with the normal and the tail recursion streams. | |
3391 | One of them will be selected later. */ | |
3392 | if (tail_recursion_insns || tail_call_insns) | |
3393 | { | |
3394 | /* The tail recursion label must be kept around. We could expose | |
3395 | its use in the CALL_PLACEHOLDER, but that creates unwanted edges | |
3396 | and makes determining true tail recursion sites difficult. | |
3397 | ||
3398 | So we set LABEL_PRESERVE_P here, then clear it when we select | |
3399 | one of the call sequences after rtl generation is complete. */ | |
3400 | if (tail_recursion_insns) | |
3401 | LABEL_PRESERVE_P (tail_recursion_label) = 1; | |
3402 | emit_call_insn (gen_rtx_CALL_PLACEHOLDER (VOIDmode, normal_call_insns, | |
3403 | tail_call_insns, | |
3404 | tail_recursion_insns, | |
3405 | tail_recursion_label)); | |
3406 | } | |
3407 | else | |
3408 | emit_insns (normal_call_insns); | |
66d433c7 | 3409 | |
60ecc450 | 3410 | currently_expanding_call--; |
6d801f27 | 3411 | |
66d433c7 | 3412 | return target; |
3413 | } | |
3414 | \f | |
00dd2e9e | 3415 | /* Returns nonzero if FUN is the symbol for a library function which can |
3416 | not throw. */ | |
3417 | ||
3418 | static int | |
3419 | libfunc_nothrow (fun) | |
3420 | rtx fun; | |
3421 | { | |
3422 | if (fun == throw_libfunc | |
3423 | || fun == rethrow_libfunc | |
3424 | || fun == sjthrow_libfunc | |
3425 | || fun == sjpopnthrow_libfunc) | |
3426 | return 0; | |
3427 | ||
3428 | return 1; | |
3429 | } | |
b39693dd | 3430 | \f |
20f7032f | 3431 | /* Output a library call to function FUN (a SYMBOL_REF rtx). |
3432 | The RETVAL parameter specifies whether return value needs to be saved, other | |
3433 | parameters are documented in the emit_library_call function bellow. */ | |
3434 | static rtx | |
26dfc457 | 3435 | emit_library_call_value_1 (retval, orgfun, value, fn_type, outmode, nargs, p) |
20f7032f | 3436 | int retval; |
3437 | rtx orgfun; | |
3438 | rtx value; | |
26dfc457 | 3439 | int fn_type; |
20f7032f | 3440 | enum machine_mode outmode; |
3441 | int nargs; | |
3442 | va_list p; | |
b39693dd | 3443 | { |
9bdaf1ba | 3444 | /* Total size in bytes of all the stack-parms scanned so far. */ |
3445 | struct args_size args_size; | |
3446 | /* Size of arguments before any adjustments (such as rounding). */ | |
3447 | struct args_size original_args_size; | |
3448 | register int argnum; | |
3449 | rtx fun; | |
3450 | int inc; | |
3451 | int count; | |
3452 | struct args_size alignment_pad; | |
3453 | rtx argblock = 0; | |
3454 | CUMULATIVE_ARGS args_so_far; | |
3455 | struct arg { rtx value; enum machine_mode mode; rtx reg; int partial; | |
3456 | struct args_size offset; struct args_size size; rtx save_area; }; | |
3457 | struct arg *argvec; | |
3458 | int old_inhibit_defer_pop = inhibit_defer_pop; | |
3459 | rtx call_fusage = 0; | |
3460 | rtx mem_value = 0; | |
16204096 | 3461 | rtx valreg; |
9bdaf1ba | 3462 | int pcc_struct_value = 0; |
3463 | int struct_value_size = 0; | |
dfe08167 | 3464 | int flags = 0; |
9bdaf1ba | 3465 | int reg_parm_stack_space = 0; |
9bdaf1ba | 3466 | int needed; |
9bdaf1ba | 3467 | |
4448f543 | 3468 | #ifdef REG_PARM_STACK_SPACE |
9bdaf1ba | 3469 | /* Define the boundary of the register parm stack space that needs to be |
3470 | save, if any. */ | |
3471 | int low_to_save = -1, high_to_save = 0; | |
3472 | rtx save_area = 0; /* Place that it is saved */ | |
3473 | #endif | |
3474 | ||
9bdaf1ba | 3475 | /* Size of the stack reserved for parameter registers. */ |
3476 | int initial_highest_arg_in_use = highest_outgoing_arg_in_use; | |
3477 | char *initial_stack_usage_map = stack_usage_map; | |
9bdaf1ba | 3478 | |
3479 | #ifdef REG_PARM_STACK_SPACE | |
3480 | #ifdef MAYBE_REG_PARM_STACK_SPACE | |
3481 | reg_parm_stack_space = MAYBE_REG_PARM_STACK_SPACE; | |
3482 | #else | |
3483 | reg_parm_stack_space = REG_PARM_STACK_SPACE ((tree) 0); | |
3484 | #endif | |
3485 | #endif | |
3486 | ||
26dfc457 | 3487 | if (fn_type == 1) |
dfe08167 | 3488 | flags |= ECF_CONST; |
26dfc457 | 3489 | else if (fn_type == 2) |
3490 | flags |= ECF_PURE; | |
9bdaf1ba | 3491 | fun = orgfun; |
3492 | ||
dfe08167 | 3493 | if (libfunc_nothrow (fun)) |
3494 | flags |= ECF_NOTHROW; | |
9bdaf1ba | 3495 | |
3496 | #ifdef PREFERRED_STACK_BOUNDARY | |
3497 | /* Ensure current function's preferred stack boundary is at least | |
3498 | what we need. */ | |
3499 | if (cfun->preferred_stack_boundary < PREFERRED_STACK_BOUNDARY) | |
3500 | cfun->preferred_stack_boundary = PREFERRED_STACK_BOUNDARY; | |
3501 | #endif | |
3502 | ||
3503 | /* If this kind of value comes back in memory, | |
3504 | decide where in memory it should come back. */ | |
20f7032f | 3505 | if (outmode != VOIDmode && aggregate_value_p (type_for_mode (outmode, 0))) |
9bdaf1ba | 3506 | { |
3507 | #ifdef PCC_STATIC_STRUCT_RETURN | |
3508 | rtx pointer_reg | |
3509 | = hard_function_value (build_pointer_type (type_for_mode (outmode, 0)), | |
3510 | 0, 0); | |
3511 | mem_value = gen_rtx_MEM (outmode, pointer_reg); | |
3512 | pcc_struct_value = 1; | |
3513 | if (value == 0) | |
3514 | value = gen_reg_rtx (outmode); | |
3515 | #else /* not PCC_STATIC_STRUCT_RETURN */ | |
3516 | struct_value_size = GET_MODE_SIZE (outmode); | |
3517 | if (value != 0 && GET_CODE (value) == MEM) | |
3518 | mem_value = value; | |
3519 | else | |
3520 | mem_value = assign_stack_temp (outmode, GET_MODE_SIZE (outmode), 0); | |
3521 | #endif | |
3522 | ||
3523 | /* This call returns a big structure. */ | |
26dfc457 | 3524 | flags &= ~(ECF_CONST | ECF_PURE); |
9bdaf1ba | 3525 | } |
3526 | ||
3527 | /* ??? Unfinished: must pass the memory address as an argument. */ | |
3528 | ||
3529 | /* Copy all the libcall-arguments out of the varargs data | |
3530 | and into a vector ARGVEC. | |
3531 | ||
3532 | Compute how to pass each argument. We only support a very small subset | |
3533 | of the full argument passing conventions to limit complexity here since | |
3534 | library functions shouldn't have many args. */ | |
3535 | ||
3536 | argvec = (struct arg *) alloca ((nargs + 1) * sizeof (struct arg)); | |
3537 | bzero ((char *) argvec, (nargs + 1) * sizeof (struct arg)); | |
3538 | ||
3539 | INIT_CUMULATIVE_ARGS (args_so_far, NULL_TREE, fun, 0); | |
3540 | ||
3541 | args_size.constant = 0; | |
3542 | args_size.var = 0; | |
3543 | ||
3544 | count = 0; | |
3545 | ||
16204096 | 3546 | /* Now we are about to start emitting insns that can be deleted |
3547 | if a libcall is deleted. */ | |
26dfc457 | 3548 | if (flags & (ECF_CONST | ECF_PURE)) |
16204096 | 3549 | start_sequence (); |
3550 | ||
9bdaf1ba | 3551 | push_temp_slots (); |
3552 | ||
3553 | /* If there's a structure value address to be passed, | |
3554 | either pass it in the special place, or pass it as an extra argument. */ | |
3555 | if (mem_value && struct_value_rtx == 0 && ! pcc_struct_value) | |
3556 | { | |
3557 | rtx addr = XEXP (mem_value, 0); | |
3558 | nargs++; | |
3559 | ||
3560 | /* Make sure it is a reasonable operand for a move or push insn. */ | |
3561 | if (GET_CODE (addr) != REG && GET_CODE (addr) != MEM | |
3562 | && ! (CONSTANT_P (addr) && LEGITIMATE_CONSTANT_P (addr))) | |
3563 | addr = force_operand (addr, NULL_RTX); | |
3564 | ||
3565 | argvec[count].value = addr; | |
3566 | argvec[count].mode = Pmode; | |
3567 | argvec[count].partial = 0; | |
3568 | ||
3569 | argvec[count].reg = FUNCTION_ARG (args_so_far, Pmode, NULL_TREE, 1); | |
3570 | #ifdef FUNCTION_ARG_PARTIAL_NREGS | |
3571 | if (FUNCTION_ARG_PARTIAL_NREGS (args_so_far, Pmode, NULL_TREE, 1)) | |
3572 | abort (); | |
3573 | #endif | |
3574 | ||
3575 | locate_and_pad_parm (Pmode, NULL_TREE, | |
2e735c0d | 3576 | #ifdef STACK_PARMS_IN_REG_PARM_AREA |
3577 | 1, | |
3578 | #else | |
3579 | argvec[count].reg != 0, | |
3580 | #endif | |
9bdaf1ba | 3581 | NULL_TREE, &args_size, &argvec[count].offset, |
3582 | &argvec[count].size, &alignment_pad); | |
3583 | ||
3584 | ||
3585 | if (argvec[count].reg == 0 || argvec[count].partial != 0 | |
3586 | || reg_parm_stack_space > 0) | |
3587 | args_size.constant += argvec[count].size.constant; | |
3588 | ||
3589 | FUNCTION_ARG_ADVANCE (args_so_far, Pmode, (tree) 0, 1); | |
3590 | ||
3591 | count++; | |
3592 | } | |
3593 | ||
3594 | for (; count < nargs; count++) | |
3595 | { | |
3596 | rtx val = va_arg (p, rtx); | |
3597 | enum machine_mode mode = va_arg (p, enum machine_mode); | |
3598 | ||
3599 | /* We cannot convert the arg value to the mode the library wants here; | |
3600 | must do it earlier where we know the signedness of the arg. */ | |
3601 | if (mode == BLKmode | |
3602 | || (GET_MODE (val) != mode && GET_MODE (val) != VOIDmode)) | |
3603 | abort (); | |
3604 | ||
3605 | /* On some machines, there's no way to pass a float to a library fcn. | |
3606 | Pass it as a double instead. */ | |
3607 | #ifdef LIBGCC_NEEDS_DOUBLE | |
3608 | if (LIBGCC_NEEDS_DOUBLE && mode == SFmode) | |
3609 | val = convert_modes (DFmode, SFmode, val, 0), mode = DFmode; | |
3610 | #endif | |
3611 | ||
3612 | /* There's no need to call protect_from_queue, because | |
3613 | either emit_move_insn or emit_push_insn will do that. */ | |
3614 | ||
3615 | /* Make sure it is a reasonable operand for a move or push insn. */ | |
3616 | if (GET_CODE (val) != REG && GET_CODE (val) != MEM | |
3617 | && ! (CONSTANT_P (val) && LEGITIMATE_CONSTANT_P (val))) | |
3618 | val = force_operand (val, NULL_RTX); | |
3619 | ||
3620 | #ifdef FUNCTION_ARG_PASS_BY_REFERENCE | |
3621 | if (FUNCTION_ARG_PASS_BY_REFERENCE (args_so_far, mode, NULL_TREE, 1)) | |
3622 | { | |
3623 | /* We do not support FUNCTION_ARG_CALLEE_COPIES here since it can | |
3624 | be viewed as just an efficiency improvement. */ | |
3625 | rtx slot = assign_stack_temp (mode, GET_MODE_SIZE (mode), 0); | |
3626 | emit_move_insn (slot, val); | |
20f7032f | 3627 | val = force_operand (XEXP (slot, 0), NULL_RTX); |
9bdaf1ba | 3628 | mode = Pmode; |
3629 | } | |
3630 | #endif | |
3631 | ||
3632 | argvec[count].value = val; | |
3633 | argvec[count].mode = mode; | |
3634 | ||
3635 | argvec[count].reg = FUNCTION_ARG (args_so_far, mode, NULL_TREE, 1); | |
3636 | ||
3637 | #ifdef FUNCTION_ARG_PARTIAL_NREGS | |
3638 | argvec[count].partial | |
3639 | = FUNCTION_ARG_PARTIAL_NREGS (args_so_far, mode, NULL_TREE, 1); | |
3640 | #else | |
3641 | argvec[count].partial = 0; | |
3642 | #endif | |
3643 | ||
3644 | locate_and_pad_parm (mode, NULL_TREE, | |
2e735c0d | 3645 | #ifdef STACK_PARMS_IN_REG_PARM_AREA |
3646 | 1, | |
3647 | #else | |
3648 | argvec[count].reg != 0, | |
3649 | #endif | |
9bdaf1ba | 3650 | NULL_TREE, &args_size, &argvec[count].offset, |
3651 | &argvec[count].size, &alignment_pad); | |
3652 | ||
3653 | if (argvec[count].size.var) | |
3654 | abort (); | |
3655 | ||
3656 | if (reg_parm_stack_space == 0 && argvec[count].partial) | |
3657 | argvec[count].size.constant -= argvec[count].partial * UNITS_PER_WORD; | |
3658 | ||
3659 | if (argvec[count].reg == 0 || argvec[count].partial != 0 | |
3660 | || reg_parm_stack_space > 0) | |
3661 | args_size.constant += argvec[count].size.constant; | |
3662 | ||
3663 | FUNCTION_ARG_ADVANCE (args_so_far, mode, (tree) 0, 1); | |
3664 | } | |
9bdaf1ba | 3665 | |
3666 | #ifdef FINAL_REG_PARM_STACK_SPACE | |
3667 | reg_parm_stack_space = FINAL_REG_PARM_STACK_SPACE (args_size.constant, | |
3668 | args_size.var); | |
3669 | #endif | |
3670 | /* If this machine requires an external definition for library | |
3671 | functions, write one out. */ | |
3672 | assemble_external_libcall (fun); | |
3673 | ||
3674 | original_args_size = args_size; | |
3675 | #ifdef PREFERRED_STACK_BOUNDARY | |
91b70175 | 3676 | args_size.constant = (((args_size.constant |
3677 | + stack_pointer_delta | |
3678 | + STACK_BYTES - 1) | |
3679 | / STACK_BYTES | |
3680 | * STACK_BYTES) | |
3681 | - stack_pointer_delta); | |
9bdaf1ba | 3682 | #endif |
3683 | ||
3684 | args_size.constant = MAX (args_size.constant, | |
3685 | reg_parm_stack_space); | |
3686 | ||
3687 | #ifndef OUTGOING_REG_PARM_STACK_SPACE | |
3688 | args_size.constant -= reg_parm_stack_space; | |
3689 | #endif | |
3690 | ||
3691 | if (args_size.constant > current_function_outgoing_args_size) | |
3692 | current_function_outgoing_args_size = args_size.constant; | |
3693 | ||
4448f543 | 3694 | if (ACCUMULATE_OUTGOING_ARGS) |
3695 | { | |
3696 | /* Since the stack pointer will never be pushed, it is possible for | |
3697 | the evaluation of a parm to clobber something we have already | |
3698 | written to the stack. Since most function calls on RISC machines | |
3699 | do not use the stack, this is uncommon, but must work correctly. | |
9bdaf1ba | 3700 | |
4448f543 | 3701 | Therefore, we save any area of the stack that was already written |
3702 | and that we are using. Here we set up to do this by making a new | |
3703 | stack usage map from the old one. | |
9bdaf1ba | 3704 | |
4448f543 | 3705 | Another approach might be to try to reorder the argument |
3706 | evaluations to avoid this conflicting stack usage. */ | |
9bdaf1ba | 3707 | |
4448f543 | 3708 | needed = args_size.constant; |
9bdaf1ba | 3709 | |
3710 | #ifndef OUTGOING_REG_PARM_STACK_SPACE | |
4448f543 | 3711 | /* Since we will be writing into the entire argument area, the |
3712 | map must be allocated for its entire size, not just the part that | |
3713 | is the responsibility of the caller. */ | |
3714 | needed += reg_parm_stack_space; | |
9bdaf1ba | 3715 | #endif |
3716 | ||
3717 | #ifdef ARGS_GROW_DOWNWARD | |
4448f543 | 3718 | highest_outgoing_arg_in_use = MAX (initial_highest_arg_in_use, |
3719 | needed + 1); | |
9bdaf1ba | 3720 | #else |
4448f543 | 3721 | highest_outgoing_arg_in_use = MAX (initial_highest_arg_in_use, |
3722 | needed); | |
9bdaf1ba | 3723 | #endif |
4448f543 | 3724 | stack_usage_map = (char *) alloca (highest_outgoing_arg_in_use); |
9bdaf1ba | 3725 | |
4448f543 | 3726 | if (initial_highest_arg_in_use) |
3727 | bcopy (initial_stack_usage_map, stack_usage_map, | |
3728 | initial_highest_arg_in_use); | |
9bdaf1ba | 3729 | |
4448f543 | 3730 | if (initial_highest_arg_in_use != highest_outgoing_arg_in_use) |
3731 | bzero (&stack_usage_map[initial_highest_arg_in_use], | |
3732 | highest_outgoing_arg_in_use - initial_highest_arg_in_use); | |
3733 | needed = 0; | |
9bdaf1ba | 3734 | |
4448f543 | 3735 | /* The address of the outgoing argument list must not be copied to a |
3736 | register here, because argblock would be left pointing to the | |
3737 | wrong place after the call to allocate_dynamic_stack_space below. | |
3738 | */ | |
9bdaf1ba | 3739 | |
4448f543 | 3740 | argblock = virtual_outgoing_args_rtx; |
3741 | } | |
3742 | else | |
3743 | { | |
3744 | if (!PUSH_ARGS) | |
3745 | argblock = push_block (GEN_INT (args_size.constant), 0, 0); | |
3746 | } | |
9bdaf1ba | 3747 | |
9bdaf1ba | 3748 | #ifdef PREFERRED_STACK_BOUNDARY |
3749 | /* If we push args individually in reverse order, perform stack alignment | |
3750 | before the first push (the last arg). */ | |
4448f543 | 3751 | if (argblock == 0 && PUSH_ARGS_REVERSED) |
9bdaf1ba | 3752 | anti_adjust_stack (GEN_INT (args_size.constant |
3753 | - original_args_size.constant)); | |
3754 | #endif | |
9bdaf1ba | 3755 | |
4448f543 | 3756 | if (PUSH_ARGS_REVERSED) |
3757 | { | |
3758 | inc = -1; | |
3759 | argnum = nargs - 1; | |
3760 | } | |
3761 | else | |
3762 | { | |
3763 | inc = 1; | |
3764 | argnum = 0; | |
3765 | } | |
9bdaf1ba | 3766 | |
4448f543 | 3767 | #ifdef REG_PARM_STACK_SPACE |
3768 | if (ACCUMULATE_OUTGOING_ARGS) | |
3769 | { | |
3770 | /* The argument list is the property of the called routine and it | |
3771 | may clobber it. If the fixed area has been used for previous | |
3772 | parameters, we must save and restore it. | |
9bdaf1ba | 3773 | |
4448f543 | 3774 | Here we compute the boundary of the that needs to be saved, if any. */ |
9bdaf1ba | 3775 | |
3776 | #ifdef ARGS_GROW_DOWNWARD | |
4448f543 | 3777 | for (count = 0; count < reg_parm_stack_space + 1; count++) |
9bdaf1ba | 3778 | #else |
4448f543 | 3779 | for (count = 0; count < reg_parm_stack_space; count++) |
9bdaf1ba | 3780 | #endif |
4448f543 | 3781 | { |
3782 | if (count >= highest_outgoing_arg_in_use | |
3783 | || stack_usage_map[count] == 0) | |
3784 | continue; | |
9bdaf1ba | 3785 | |
4448f543 | 3786 | if (low_to_save == -1) |
3787 | low_to_save = count; | |
9bdaf1ba | 3788 | |
4448f543 | 3789 | high_to_save = count; |
3790 | } | |
9bdaf1ba | 3791 | |
4448f543 | 3792 | if (low_to_save >= 0) |
3793 | { | |
3794 | int num_to_save = high_to_save - low_to_save + 1; | |
3795 | enum machine_mode save_mode | |
3796 | = mode_for_size (num_to_save * BITS_PER_UNIT, MODE_INT, 1); | |
3797 | rtx stack_area; | |
9bdaf1ba | 3798 | |
4448f543 | 3799 | /* If we don't have the required alignment, must do this in BLKmode. */ |
3800 | if ((low_to_save & (MIN (GET_MODE_SIZE (save_mode), | |
3801 | BIGGEST_ALIGNMENT / UNITS_PER_WORD) - 1))) | |
3802 | save_mode = BLKmode; | |
9bdaf1ba | 3803 | |
3804 | #ifdef ARGS_GROW_DOWNWARD | |
4448f543 | 3805 | stack_area = gen_rtx_MEM (save_mode, |
3806 | memory_address (save_mode, | |
3807 | plus_constant (argblock, | |
3808 | - high_to_save))); | |
9bdaf1ba | 3809 | #else |
4448f543 | 3810 | stack_area = gen_rtx_MEM (save_mode, |
3811 | memory_address (save_mode, | |
3812 | plus_constant (argblock, | |
3813 | low_to_save))); | |
9bdaf1ba | 3814 | #endif |
4448f543 | 3815 | if (save_mode == BLKmode) |
3816 | { | |
3817 | save_area = assign_stack_temp (BLKmode, num_to_save, 0); | |
3818 | emit_block_move (validize_mem (save_area), stack_area, | |
325d1c45 | 3819 | GEN_INT (num_to_save), PARM_BOUNDARY); |
4448f543 | 3820 | } |
3821 | else | |
3822 | { | |
3823 | save_area = gen_reg_rtx (save_mode); | |
3824 | emit_move_insn (save_area, stack_area); | |
3825 | } | |
9bdaf1ba | 3826 | } |
3827 | } | |
3828 | #endif | |
3829 | ||
3830 | /* Push the args that need to be pushed. */ | |
3831 | ||
3832 | /* ARGNUM indexes the ARGVEC array in the order in which the arguments | |
3833 | are to be pushed. */ | |
3834 | for (count = 0; count < nargs; count++, argnum += inc) | |
3835 | { | |
3836 | register enum machine_mode mode = argvec[argnum].mode; | |
3837 | register rtx val = argvec[argnum].value; | |
3838 | rtx reg = argvec[argnum].reg; | |
3839 | int partial = argvec[argnum].partial; | |
4448f543 | 3840 | int lower_bound = 0, upper_bound = 0, i; |
9bdaf1ba | 3841 | |
3842 | if (! (reg != 0 && partial == 0)) | |
3843 | { | |
4448f543 | 3844 | if (ACCUMULATE_OUTGOING_ARGS) |
3845 | { | |
02510658 | 3846 | /* If this is being stored into a pre-allocated, fixed-size, |
3847 | stack area, save any previous data at that location. */ | |
9bdaf1ba | 3848 | |
3849 | #ifdef ARGS_GROW_DOWNWARD | |
4448f543 | 3850 | /* stack_slot is negative, but we want to index stack_usage_map |
3851 | with positive values. */ | |
3852 | upper_bound = -argvec[argnum].offset.constant + 1; | |
3853 | lower_bound = upper_bound - argvec[argnum].size.constant; | |
9bdaf1ba | 3854 | #else |
4448f543 | 3855 | lower_bound = argvec[argnum].offset.constant; |
3856 | upper_bound = lower_bound + argvec[argnum].size.constant; | |
9bdaf1ba | 3857 | #endif |
3858 | ||
4448f543 | 3859 | for (i = lower_bound; i < upper_bound; i++) |
3860 | if (stack_usage_map[i] | |
02510658 | 3861 | /* Don't store things in the fixed argument area at this |
3862 | point; it has already been saved. */ | |
4448f543 | 3863 | && i > reg_parm_stack_space) |
3864 | break; | |
9bdaf1ba | 3865 | |
4448f543 | 3866 | if (i != upper_bound) |
3867 | { | |
02510658 | 3868 | /* We need to make a save area. See what mode we can make |
3869 | it. */ | |
4448f543 | 3870 | enum machine_mode save_mode |
02510658 | 3871 | = mode_for_size (argvec[argnum].size.constant |
3872 | * BITS_PER_UNIT, | |
4448f543 | 3873 | MODE_INT, 1); |
3874 | rtx stack_area | |
3875 | = gen_rtx_MEM | |
3876 | (save_mode, | |
3877 | memory_address | |
3878 | (save_mode, | |
3879 | plus_constant (argblock, | |
3880 | argvec[argnum].offset.constant))); | |
3881 | argvec[argnum].save_area = gen_reg_rtx (save_mode); | |
3882 | ||
3883 | emit_move_insn (argvec[argnum].save_area, stack_area); | |
3884 | } | |
9bdaf1ba | 3885 | } |
325d1c45 | 3886 | |
9bdaf1ba | 3887 | emit_push_insn (val, mode, NULL_TREE, NULL_RTX, 0, partial, reg, 0, |
3888 | argblock, GEN_INT (argvec[argnum].offset.constant), | |
3889 | reg_parm_stack_space, ARGS_SIZE_RTX (alignment_pad)); | |
3890 | ||
9bdaf1ba | 3891 | /* Now mark the segment we just used. */ |
4448f543 | 3892 | if (ACCUMULATE_OUTGOING_ARGS) |
3893 | for (i = lower_bound; i < upper_bound; i++) | |
3894 | stack_usage_map[i] = 1; | |
9bdaf1ba | 3895 | |
3896 | NO_DEFER_POP; | |
3897 | } | |
3898 | } | |
3899 | ||
9bdaf1ba | 3900 | #ifdef PREFERRED_STACK_BOUNDARY |
3901 | /* If we pushed args in forward order, perform stack alignment | |
3902 | after pushing the last arg. */ | |
4448f543 | 3903 | if (argblock == 0 && !PUSH_ARGS_REVERSED) |
9bdaf1ba | 3904 | anti_adjust_stack (GEN_INT (args_size.constant |
3905 | - original_args_size.constant)); | |
3906 | #endif | |
9bdaf1ba | 3907 | |
4448f543 | 3908 | if (PUSH_ARGS_REVERSED) |
3909 | argnum = nargs - 1; | |
3910 | else | |
3911 | argnum = 0; | |
9bdaf1ba | 3912 | |
3913 | fun = prepare_call_address (fun, NULL_TREE, &call_fusage, 0); | |
3914 | ||
3915 | /* Now load any reg parms into their regs. */ | |
3916 | ||
3917 | /* ARGNUM indexes the ARGVEC array in the order in which the arguments | |
3918 | are to be pushed. */ | |
3919 | for (count = 0; count < nargs; count++, argnum += inc) | |
3920 | { | |
3921 | register rtx val = argvec[argnum].value; | |
3922 | rtx reg = argvec[argnum].reg; | |
3923 | int partial = argvec[argnum].partial; | |
3924 | ||
3925 | /* Handle calls that pass values in multiple non-contiguous | |
3926 | locations. The PA64 has examples of this for library calls. */ | |
3927 | if (reg != 0 && GET_CODE (reg) == PARALLEL) | |
3928 | emit_group_load (reg, val, | |
3929 | GET_MODE_SIZE (GET_MODE (val)), | |
3930 | GET_MODE_ALIGNMENT (GET_MODE (val))); | |
3931 | else if (reg != 0 && partial == 0) | |
3932 | emit_move_insn (reg, val); | |
3933 | ||
3934 | NO_DEFER_POP; | |
3935 | } | |
3936 | ||
9bdaf1ba | 3937 | /* Any regs containing parms remain in use through the call. */ |
3938 | for (count = 0; count < nargs; count++) | |
3939 | { | |
3940 | rtx reg = argvec[count].reg; | |
3941 | if (reg != 0 && GET_CODE (reg) == PARALLEL) | |
3942 | use_group_regs (&call_fusage, reg); | |
3943 | else if (reg != 0) | |
3944 | use_reg (&call_fusage, reg); | |
3945 | } | |
3946 | ||
3947 | /* Pass the function the address in which to return a structure value. */ | |
3948 | if (mem_value != 0 && struct_value_rtx != 0 && ! pcc_struct_value) | |
3949 | { | |
3950 | emit_move_insn (struct_value_rtx, | |
3951 | force_reg (Pmode, | |
3952 | force_operand (XEXP (mem_value, 0), | |
3953 | NULL_RTX))); | |
3954 | if (GET_CODE (struct_value_rtx) == REG) | |
3955 | use_reg (&call_fusage, struct_value_rtx); | |
3956 | } | |
3957 | ||
3958 | /* Don't allow popping to be deferred, since then | |
3959 | cse'ing of library calls could delete a call and leave the pop. */ | |
3960 | NO_DEFER_POP; | |
16204096 | 3961 | valreg = (mem_value == 0 && outmode != VOIDmode |
3962 | ? hard_libcall_value (outmode) : NULL_RTX); | |
9bdaf1ba | 3963 | |
fa4f1f09 | 3964 | #ifdef PREFERRED_STACK_BOUNDARY |
481feae3 | 3965 | /* Stack must be properly aligned now. */ |
fa4f1f09 | 3966 | if (stack_pointer_delta & (PREFERRED_STACK_BOUNDARY / BITS_PER_UNIT - 1)) |
3967 | abort(); | |
3968 | #endif | |
3969 | ||
9bdaf1ba | 3970 | /* We pass the old value of inhibit_defer_pop + 1 to emit_call_1, which |
3971 | will set inhibit_defer_pop to that value. */ | |
20f7032f | 3972 | /* The return type is needed to decide how many bytes the function pops. |
3973 | Signedness plays no role in that, so for simplicity, we pretend it's | |
3974 | always signed. We also assume that the list of arguments passed has | |
3975 | no impact, so we pretend it is unknown. */ | |
9bdaf1ba | 3976 | |
3977 | emit_call_1 (fun, | |
3978 | get_identifier (XSTR (orgfun, 0)), | |
20f7032f | 3979 | build_function_type (outmode == VOIDmode ? void_type_node |
3980 | : type_for_mode (outmode, 0), NULL_TREE), | |
9bdaf1ba | 3981 | original_args_size.constant, args_size.constant, |
3982 | struct_value_size, | |
3983 | FUNCTION_ARG (args_so_far, VOIDmode, void_type_node, 1), | |
16204096 | 3984 | valreg, |
dfe08167 | 3985 | old_inhibit_defer_pop + 1, call_fusage, flags); |
9bdaf1ba | 3986 | |
3987 | /* Now restore inhibit_defer_pop to its actual original value. */ | |
3988 | OK_DEFER_POP; | |
3989 | ||
16204096 | 3990 | /* If call is cse'able, make appropriate pair of reg-notes around it. |
3991 | Test valreg so we don't crash; may safely ignore `const' | |
3992 | if return type is void. Disable for PARALLEL return values, because | |
3993 | we have no way to move such values into a pseudo register. */ | |
26dfc457 | 3994 | if ((flags & (ECF_CONST | ECF_PURE)) |
16204096 | 3995 | && valreg != 0 && GET_CODE (valreg) != PARALLEL) |
3996 | { | |
3997 | rtx note = 0; | |
3998 | rtx temp = gen_reg_rtx (GET_MODE (valreg)); | |
3999 | rtx insns; | |
4000 | int i; | |
4001 | ||
4002 | /* Construct an "equal form" for the value which mentions all the | |
4003 | arguments in order as well as the function name. */ | |
4004 | for (i = 0; i < nargs; i++) | |
4005 | note = gen_rtx_EXPR_LIST (VOIDmode, argvec[i].value, note); | |
4006 | note = gen_rtx_EXPR_LIST (VOIDmode, fun, note); | |
4007 | ||
4008 | insns = get_insns (); | |
4009 | end_sequence (); | |
4010 | ||
26dfc457 | 4011 | if (flags & ECF_PURE) |
4012 | note = gen_rtx_EXPR_LIST (VOIDmode, | |
4013 | gen_rtx_USE (VOIDmode, | |
4014 | gen_rtx_MEM (BLKmode, | |
4015 | gen_rtx_SCRATCH (VOIDmode))), note); | |
4016 | ||
16204096 | 4017 | emit_libcall_block (insns, temp, valreg, note); |
4018 | ||
4019 | valreg = temp; | |
4020 | } | |
26dfc457 | 4021 | else if (flags & (ECF_CONST | ECF_PURE)) |
16204096 | 4022 | { |
4023 | /* Otherwise, just write out the sequence without a note. */ | |
4024 | rtx insns = get_insns (); | |
4025 | ||
4026 | end_sequence (); | |
4027 | emit_insns (insns); | |
4028 | } | |
9bdaf1ba | 4029 | pop_temp_slots (); |
4030 | ||
4031 | /* Copy the value to the right place. */ | |
20f7032f | 4032 | if (outmode != VOIDmode && retval) |
9bdaf1ba | 4033 | { |
4034 | if (mem_value) | |
4035 | { | |
4036 | if (value == 0) | |
4037 | value = mem_value; | |
4038 | if (value != mem_value) | |
4039 | emit_move_insn (value, mem_value); | |
4040 | } | |
4041 | else if (value != 0) | |
d9f102cc | 4042 | emit_move_insn (value, hard_libcall_value (outmode)); |
9bdaf1ba | 4043 | else |
d9f102cc | 4044 | value = hard_libcall_value (outmode); |
9bdaf1ba | 4045 | } |
4046 | ||
4448f543 | 4047 | if (ACCUMULATE_OUTGOING_ARGS) |
9bdaf1ba | 4048 | { |
4448f543 | 4049 | #ifdef REG_PARM_STACK_SPACE |
4050 | if (save_area) | |
4051 | { | |
4052 | enum machine_mode save_mode = GET_MODE (save_area); | |
9bdaf1ba | 4053 | #ifdef ARGS_GROW_DOWNWARD |
4448f543 | 4054 | rtx stack_area |
4055 | = gen_rtx_MEM (save_mode, | |
4056 | memory_address (save_mode, | |
4057 | plus_constant (argblock, | |
4058 | - high_to_save))); | |
9bdaf1ba | 4059 | #else |
4448f543 | 4060 | rtx stack_area |
4061 | = gen_rtx_MEM (save_mode, | |
4062 | memory_address (save_mode, | |
4063 | plus_constant (argblock, low_to_save))); | |
9bdaf1ba | 4064 | #endif |
4448f543 | 4065 | if (save_mode != BLKmode) |
4066 | emit_move_insn (stack_area, save_area); | |
4067 | else | |
4068 | emit_block_move (stack_area, validize_mem (save_area), | |
4069 | GEN_INT (high_to_save - low_to_save + 1), | |
325d1c45 | 4070 | PARM_BOUNDARY); |
4448f543 | 4071 | } |
9bdaf1ba | 4072 | #endif |
4448f543 | 4073 | |
4074 | /* If we saved any argument areas, restore them. */ | |
4075 | for (count = 0; count < nargs; count++) | |
4076 | if (argvec[count].save_area) | |
4077 | { | |
4078 | enum machine_mode save_mode = GET_MODE (argvec[count].save_area); | |
4079 | rtx stack_area | |
4080 | = gen_rtx_MEM (save_mode, | |
4081 | memory_address | |
4082 | (save_mode, | |
4083 | plus_constant (argblock, | |
4084 | argvec[count].offset.constant))); | |
4085 | ||
4086 | emit_move_insn (stack_area, argvec[count].save_area); | |
4087 | } | |
9bdaf1ba | 4088 | |
4448f543 | 4089 | highest_outgoing_arg_in_use = initial_highest_arg_in_use; |
4090 | stack_usage_map = initial_stack_usage_map; | |
4091 | } | |
b39693dd | 4092 | |
20f7032f | 4093 | return value; |
4094 | ||
4095 | } | |
4096 | \f | |
4097 | /* Output a library call to function FUN (a SYMBOL_REF rtx) | |
4098 | (emitting the queue unless NO_QUEUE is nonzero), | |
4099 | for a value of mode OUTMODE, | |
4100 | with NARGS different arguments, passed as alternating rtx values | |
4101 | and machine_modes to convert them to. | |
4102 | The rtx values should have been passed through protect_from_queue already. | |
4103 | ||
26dfc457 | 4104 | FN_TYPE will is zero for `normal' calls, one for `const' calls, wich |
4105 | which will be enclosed in REG_LIBCALL/REG_RETVAL notes and two for `pure' | |
4106 | calls, that are handled like `const' calls with extra | |
4107 | (use (memory (scratch)). */ | |
20f7032f | 4108 | |
4109 | void | |
26dfc457 | 4110 | emit_library_call VPARAMS((rtx orgfun, int fn_type, enum machine_mode outmode, |
20f7032f | 4111 | int nargs, ...)) |
4112 | { | |
4113 | #ifndef ANSI_PROTOTYPES | |
4114 | rtx orgfun; | |
26dfc457 | 4115 | int fn_type; |
20f7032f | 4116 | enum machine_mode outmode; |
4117 | int nargs; | |
4118 | #endif | |
4119 | va_list p; | |
4120 | ||
4121 | VA_START (p, nargs); | |
4122 | ||
4123 | #ifndef ANSI_PROTOTYPES | |
4124 | orgfun = va_arg (p, rtx); | |
26dfc457 | 4125 | fn_type = va_arg (p, int); |
20f7032f | 4126 | outmode = va_arg (p, enum machine_mode); |
4127 | nargs = va_arg (p, int); | |
4128 | #endif | |
4129 | ||
26dfc457 | 4130 | emit_library_call_value_1 (0, orgfun, NULL_RTX, fn_type, outmode, nargs, p); |
20f7032f | 4131 | |
4132 | va_end (p); | |
4133 | } | |
4134 | \f | |
4135 | /* Like emit_library_call except that an extra argument, VALUE, | |
4136 | comes second and says where to store the result. | |
4137 | (If VALUE is zero, this function chooses a convenient way | |
4138 | to return the value. | |
4139 | ||
4140 | This function returns an rtx for where the value is to be found. | |
4141 | If VALUE is nonzero, VALUE is returned. */ | |
4142 | ||
4143 | rtx | |
26dfc457 | 4144 | emit_library_call_value VPARAMS((rtx orgfun, rtx value, int fn_type, |
20f7032f | 4145 | enum machine_mode outmode, int nargs, ...)) |
4146 | { | |
4147 | #ifndef ANSI_PROTOTYPES | |
4148 | rtx orgfun; | |
4149 | rtx value; | |
26dfc457 | 4150 | int fn_type; |
20f7032f | 4151 | enum machine_mode outmode; |
4152 | int nargs; | |
4153 | #endif | |
4154 | va_list p; | |
4155 | ||
4156 | VA_START (p, nargs); | |
4157 | ||
4158 | #ifndef ANSI_PROTOTYPES | |
4159 | orgfun = va_arg (p, rtx); | |
4160 | value = va_arg (p, rtx); | |
26dfc457 | 4161 | fn_type = va_arg (p, int); |
20f7032f | 4162 | outmode = va_arg (p, enum machine_mode); |
4163 | nargs = va_arg (p, int); | |
4164 | #endif | |
4165 | ||
26dfc457 | 4166 | value = emit_library_call_value_1 (1, orgfun, value, fn_type, outmode, nargs, p); |
20f7032f | 4167 | |
4168 | va_end (p); | |
4169 | ||
371645b0 | 4170 | return value; |
8ddf1c7e | 4171 | } |
4172 | \f | |
66d433c7 | 4173 | #if 0 |
4174 | /* Return an rtx which represents a suitable home on the stack | |
4175 | given TYPE, the type of the argument looking for a home. | |
4176 | This is called only for BLKmode arguments. | |
4177 | ||
4178 | SIZE is the size needed for this target. | |
4179 | ARGS_ADDR is the address of the bottom of the argument block for this call. | |
4180 | OFFSET describes this parameter's offset into ARGS_ADDR. It is meaningless | |
4181 | if this machine uses push insns. */ | |
4182 | ||
4183 | static rtx | |
4184 | target_for_arg (type, size, args_addr, offset) | |
4185 | tree type; | |
4186 | rtx size; | |
4187 | rtx args_addr; | |
4188 | struct args_size offset; | |
4189 | { | |
4190 | rtx target; | |
4191 | rtx offset_rtx = ARGS_SIZE_RTX (offset); | |
4192 | ||
4193 | /* We do not call memory_address if possible, | |
4194 | because we want to address as close to the stack | |
4195 | as possible. For non-variable sized arguments, | |
4196 | this will be stack-pointer relative addressing. */ | |
4197 | if (GET_CODE (offset_rtx) == CONST_INT) | |
4198 | target = plus_constant (args_addr, INTVAL (offset_rtx)); | |
4199 | else | |
4200 | { | |
4201 | /* I have no idea how to guarantee that this | |
4202 | will work in the presence of register parameters. */ | |
941522d6 | 4203 | target = gen_rtx_PLUS (Pmode, args_addr, offset_rtx); |
66d433c7 | 4204 | target = memory_address (QImode, target); |
4205 | } | |
4206 | ||
941522d6 | 4207 | return gen_rtx_MEM (BLKmode, target); |
66d433c7 | 4208 | } |
4209 | #endif | |
4210 | \f | |
4211 | /* Store a single argument for a function call | |
4212 | into the register or memory area where it must be passed. | |
4213 | *ARG describes the argument value and where to pass it. | |
4214 | ||
4215 | ARGBLOCK is the address of the stack-block for all the arguments, | |
f9e15121 | 4216 | or 0 on a machine where arguments are pushed individually. |
66d433c7 | 4217 | |
4218 | MAY_BE_ALLOCA nonzero says this could be a call to `alloca' | |
4219 | so must be careful about how the stack is used. | |
4220 | ||
4221 | VARIABLE_SIZE nonzero says that this was a variable-sized outgoing | |
4222 | argument stack. This is used if ACCUMULATE_OUTGOING_ARGS to indicate | |
4223 | that we need not worry about saving and restoring the stack. | |
4224 | ||
57679d39 | 4225 | FNDECL is the declaration of the function we are calling. |
4226 | ||
4227 | Return non-zero if this arg should cause sibcall failure, | |
4228 | zero otherwise. */ | |
66d433c7 | 4229 | |
57679d39 | 4230 | static int |
02510658 | 4231 | store_one_arg (arg, argblock, flags, variable_size, |
2d7187c2 | 4232 | reg_parm_stack_space) |
66d433c7 | 4233 | struct arg_data *arg; |
4234 | rtx argblock; | |
02510658 | 4235 | int flags; |
e717ffc2 | 4236 | int variable_size ATTRIBUTE_UNUSED; |
2d7187c2 | 4237 | int reg_parm_stack_space; |
66d433c7 | 4238 | { |
4239 | register tree pval = arg->tree_value; | |
4240 | rtx reg = 0; | |
4241 | int partial = 0; | |
4242 | int used = 0; | |
df9f2bb6 | 4243 | int i, lower_bound = 0, upper_bound = 0; |
57679d39 | 4244 | int sibcall_failure = 0; |
66d433c7 | 4245 | |
4246 | if (TREE_CODE (pval) == ERROR_MARK) | |
57679d39 | 4247 | return 1; |
66d433c7 | 4248 | |
1b117c60 | 4249 | /* Push a new temporary level for any temporaries we make for |
4250 | this argument. */ | |
4251 | push_temp_slots (); | |
4252 | ||
02510658 | 4253 | if (ACCUMULATE_OUTGOING_ARGS && !(flags & ECF_SIBCALL)) |
66d433c7 | 4254 | { |
4448f543 | 4255 | /* If this is being stored into a pre-allocated, fixed-size, stack area, |
4256 | save any previous data at that location. */ | |
4257 | if (argblock && ! variable_size && arg->stack) | |
4258 | { | |
66d433c7 | 4259 | #ifdef ARGS_GROW_DOWNWARD |
4448f543 | 4260 | /* stack_slot is negative, but we want to index stack_usage_map |
4261 | with positive values. */ | |
4262 | if (GET_CODE (XEXP (arg->stack_slot, 0)) == PLUS) | |
4263 | upper_bound = -INTVAL (XEXP (XEXP (arg->stack_slot, 0), 1)) + 1; | |
4264 | else | |
4265 | upper_bound = 0; | |
66d433c7 | 4266 | |
4448f543 | 4267 | lower_bound = upper_bound - arg->size.constant; |
66d433c7 | 4268 | #else |
4448f543 | 4269 | if (GET_CODE (XEXP (arg->stack_slot, 0)) == PLUS) |
4270 | lower_bound = INTVAL (XEXP (XEXP (arg->stack_slot, 0), 1)); | |
4271 | else | |
4272 | lower_bound = 0; | |
66d433c7 | 4273 | |
4448f543 | 4274 | upper_bound = lower_bound + arg->size.constant; |
66d433c7 | 4275 | #endif |
4276 | ||
4448f543 | 4277 | for (i = lower_bound; i < upper_bound; i++) |
4278 | if (stack_usage_map[i] | |
4279 | /* Don't store things in the fixed argument area at this point; | |
4280 | it has already been saved. */ | |
4281 | && i > reg_parm_stack_space) | |
4282 | break; | |
66d433c7 | 4283 | |
4448f543 | 4284 | if (i != upper_bound) |
66d433c7 | 4285 | { |
4448f543 | 4286 | /* We need to make a save area. See what mode we can make it. */ |
4287 | enum machine_mode save_mode | |
4288 | = mode_for_size (arg->size.constant * BITS_PER_UNIT, MODE_INT, 1); | |
4289 | rtx stack_area | |
4290 | = gen_rtx_MEM (save_mode, | |
4291 | memory_address (save_mode, | |
4292 | XEXP (arg->stack_slot, 0))); | |
4293 | ||
4294 | if (save_mode == BLKmode) | |
4295 | { | |
4296 | arg->save_area = assign_stack_temp (BLKmode, | |
4297 | arg->size.constant, 0); | |
4298 | MEM_SET_IN_STRUCT_P (arg->save_area, | |
4299 | AGGREGATE_TYPE_P (TREE_TYPE | |
4300 | (arg->tree_value))); | |
4301 | preserve_temp_slots (arg->save_area); | |
4302 | emit_block_move (validize_mem (arg->save_area), stack_area, | |
4303 | GEN_INT (arg->size.constant), | |
325d1c45 | 4304 | PARM_BOUNDARY); |
4448f543 | 4305 | } |
4306 | else | |
4307 | { | |
4308 | arg->save_area = gen_reg_rtx (save_mode); | |
4309 | emit_move_insn (arg->save_area, stack_area); | |
4310 | } | |
66d433c7 | 4311 | } |
4312 | } | |
4448f543 | 4313 | /* Now that we have saved any slots that will be overwritten by this |
4314 | store, mark all slots this store will use. We must do this before | |
4315 | we actually expand the argument since the expansion itself may | |
4316 | trigger library calls which might need to use the same stack slot. */ | |
4317 | if (argblock && ! variable_size && arg->stack) | |
4318 | for (i = lower_bound; i < upper_bound; i++) | |
4319 | stack_usage_map[i] = 1; | |
66d433c7 | 4320 | } |
b3caaea3 | 4321 | |
66d433c7 | 4322 | /* If this isn't going to be placed on both the stack and in registers, |
4323 | set up the register and number of words. */ | |
4324 | if (! arg->pass_on_stack) | |
4325 | reg = arg->reg, partial = arg->partial; | |
4326 | ||
4327 | if (reg != 0 && partial == 0) | |
4328 | /* Being passed entirely in a register. We shouldn't be called in | |
4329 | this case. */ | |
4330 | abort (); | |
4331 | ||
f28c7a75 | 4332 | /* If this arg needs special alignment, don't load the registers |
4333 | here. */ | |
4334 | if (arg->n_aligned_regs != 0) | |
4335 | reg = 0; | |
f28c7a75 | 4336 | |
f28c7a75 | 4337 | /* If this is being passed partially in a register, we can't evaluate |
66d433c7 | 4338 | it directly into its stack slot. Otherwise, we can. */ |
4339 | if (arg->value == 0) | |
f848041f | 4340 | { |
f848041f | 4341 | /* stack_arg_under_construction is nonzero if a function argument is |
4342 | being evaluated directly into the outgoing argument list and | |
4343 | expand_call must take special action to preserve the argument list | |
4344 | if it is called recursively. | |
4345 | ||
4346 | For scalar function arguments stack_usage_map is sufficient to | |
4347 | determine which stack slots must be saved and restored. Scalar | |
4348 | arguments in general have pass_on_stack == 0. | |
4349 | ||
4350 | If this argument is initialized by a function which takes the | |
4351 | address of the argument (a C++ constructor or a C function | |
4352 | returning a BLKmode structure), then stack_usage_map is | |
4353 | insufficient and expand_call must push the stack around the | |
4354 | function call. Such arguments have pass_on_stack == 1. | |
4355 | ||
4356 | Note that it is always safe to set stack_arg_under_construction, | |
4357 | but this generates suboptimal code if set when not needed. */ | |
4358 | ||
4359 | if (arg->pass_on_stack) | |
4360 | stack_arg_under_construction++; | |
4448f543 | 4361 | |
7dbf1af4 | 4362 | arg->value = expand_expr (pval, |
4363 | (partial | |
4364 | || TYPE_MODE (TREE_TYPE (pval)) != arg->mode) | |
4365 | ? NULL_RTX : arg->stack, | |
9e6d0a9a | 4366 | VOIDmode, 0); |
1c0c37a5 | 4367 | |
4368 | /* If we are promoting object (or for any other reason) the mode | |
4369 | doesn't agree, convert the mode. */ | |
4370 | ||
1560ef8f | 4371 | if (arg->mode != TYPE_MODE (TREE_TYPE (pval))) |
4372 | arg->value = convert_modes (arg->mode, TYPE_MODE (TREE_TYPE (pval)), | |
4373 | arg->value, arg->unsignedp); | |
1c0c37a5 | 4374 | |
f848041f | 4375 | if (arg->pass_on_stack) |
4376 | stack_arg_under_construction--; | |
f848041f | 4377 | } |
66d433c7 | 4378 | |
4379 | /* Don't allow anything left on stack from computation | |
4380 | of argument to alloca. */ | |
02510658 | 4381 | if (flags & ECF_MAY_BE_ALLOCA) |
66d433c7 | 4382 | do_pending_stack_adjust (); |
4383 | ||
4384 | if (arg->value == arg->stack) | |
7cc85421 | 4385 | { |
7014838c | 4386 | /* If the value is already in the stack slot, we are done. */ |
efea460c | 4387 | if (current_function_check_memory_usage && GET_CODE (arg->stack) == MEM) |
7cc85421 | 4388 | { |
7cc85421 | 4389 | emit_library_call (chkr_set_right_libfunc, 1, VOIDmode, 3, |
0aca66d5 | 4390 | XEXP (arg->stack, 0), Pmode, |
efea460c | 4391 | ARGS_SIZE_RTX (arg->size), |
7cc85421 | 4392 | TYPE_MODE (sizetype), |
ad87de1e | 4393 | GEN_INT (MEMORY_USE_RW), |
4394 | TYPE_MODE (integer_type_node)); | |
7cc85421 | 4395 | } |
4396 | } | |
1c0c37a5 | 4397 | else if (arg->mode != BLKmode) |
66d433c7 | 4398 | { |
4399 | register int size; | |
4400 | ||
4401 | /* Argument is a scalar, not entirely passed in registers. | |
4402 | (If part is passed in registers, arg->partial says how much | |
4403 | and emit_push_insn will take care of putting it there.) | |
4404 | ||
4405 | Push it, and if its size is less than the | |
4406 | amount of space allocated to it, | |
4407 | also bump stack pointer by the additional space. | |
4408 | Note that in C the default argument promotions | |
4409 | will prevent such mismatches. */ | |
4410 | ||
1c0c37a5 | 4411 | size = GET_MODE_SIZE (arg->mode); |
66d433c7 | 4412 | /* Compute how much space the push instruction will push. |
4413 | On many machines, pushing a byte will advance the stack | |
4414 | pointer by a halfword. */ | |
4415 | #ifdef PUSH_ROUNDING | |
4416 | size = PUSH_ROUNDING (size); | |
4417 | #endif | |
4418 | used = size; | |
4419 | ||
4420 | /* Compute how much space the argument should get: | |
4421 | round up to a multiple of the alignment for arguments. */ | |
1c0c37a5 | 4422 | if (none != FUNCTION_ARG_PADDING (arg->mode, TREE_TYPE (pval))) |
66d433c7 | 4423 | used = (((size + PARM_BOUNDARY / BITS_PER_UNIT - 1) |
4424 | / (PARM_BOUNDARY / BITS_PER_UNIT)) | |
4425 | * (PARM_BOUNDARY / BITS_PER_UNIT)); | |
4426 | ||
4427 | /* This isn't already where we want it on the stack, so put it there. | |
4428 | This can either be done with push or copy insns. */ | |
997d68fe | 4429 | emit_push_insn (arg->value, arg->mode, TREE_TYPE (pval), NULL_RTX, 0, |
4430 | partial, reg, used - size, argblock, | |
9d855d2f | 4431 | ARGS_SIZE_RTX (arg->offset), reg_parm_stack_space, |
4432 | ARGS_SIZE_RTX (arg->alignment_pad)); | |
66d433c7 | 4433 | } |
4434 | else | |
4435 | { | |
4436 | /* BLKmode, at least partly to be pushed. */ | |
4437 | ||
4438 | register int excess; | |
4439 | rtx size_rtx; | |
4440 | ||
4441 | /* Pushing a nonscalar. | |
4442 | If part is passed in registers, PARTIAL says how much | |
4443 | and emit_push_insn will take care of putting it there. */ | |
4444 | ||
4445 | /* Round its size up to a multiple | |
4446 | of the allocation unit for arguments. */ | |
4447 | ||
4448 | if (arg->size.var != 0) | |
4449 | { | |
4450 | excess = 0; | |
4451 | size_rtx = ARGS_SIZE_RTX (arg->size); | |
4452 | } | |
4453 | else | |
4454 | { | |
66d433c7 | 4455 | /* PUSH_ROUNDING has no effect on us, because |
4456 | emit_push_insn for BLKmode is careful to avoid it. */ | |
662c3b26 | 4457 | excess = (arg->size.constant - int_size_in_bytes (TREE_TYPE (pval)) |
66d433c7 | 4458 | + partial * UNITS_PER_WORD); |
f326cf41 | 4459 | size_rtx = expr_size (pval); |
66d433c7 | 4460 | } |
4461 | ||
57679d39 | 4462 | if ((flags & ECF_SIBCALL) && GET_CODE (arg->value) == MEM) |
4463 | { | |
4464 | /* emit_push_insn might not work properly if arg->value and | |
4465 | argblock + arg->offset areas overlap. */ | |
4466 | rtx x = arg->value; | |
4467 | int i = 0; | |
4468 | ||
4469 | if (XEXP (x, 0) == current_function_internal_arg_pointer | |
4470 | || (GET_CODE (XEXP (x, 0)) == PLUS | |
4471 | && XEXP (XEXP (x, 0), 0) == | |
4472 | current_function_internal_arg_pointer | |
4473 | && GET_CODE (XEXP (XEXP (x, 0), 1)) == CONST_INT)) | |
4474 | { | |
4475 | if (XEXP (x, 0) != current_function_internal_arg_pointer) | |
4476 | i = INTVAL (XEXP (XEXP (x, 0), 1)); | |
4477 | ||
4478 | /* expand_call should ensure this */ | |
4479 | if (arg->offset.var || GET_CODE (size_rtx) != CONST_INT) | |
4480 | abort (); | |
4481 | ||
4482 | if (arg->offset.constant > i) | |
4483 | { | |
4484 | if (arg->offset.constant < i + INTVAL (size_rtx)) | |
4485 | sibcall_failure = 1; | |
4486 | } | |
4487 | else if (arg->offset.constant < i) | |
4488 | { | |
4489 | if (i < arg->offset.constant + INTVAL (size_rtx)) | |
4490 | sibcall_failure = 1; | |
4491 | } | |
4492 | } | |
4493 | } | |
4494 | ||
1c0c37a5 | 4495 | emit_push_insn (arg->value, arg->mode, TREE_TYPE (pval), size_rtx, |
325d1c45 | 4496 | TYPE_ALIGN (TREE_TYPE (pval)), partial, reg, excess, |
4497 | argblock, ARGS_SIZE_RTX (arg->offset), | |
9d855d2f | 4498 | reg_parm_stack_space, |
4499 | ARGS_SIZE_RTX (arg->alignment_pad)); | |
66d433c7 | 4500 | } |
4501 | ||
4502 | ||
4503 | /* Unless this is a partially-in-register argument, the argument is now | |
4504 | in the stack. | |
4505 | ||
4506 | ??? Note that this can change arg->value from arg->stack to | |
4507 | arg->stack_slot and it matters when they are not the same. | |
4508 | It isn't totally clear that this is correct in all cases. */ | |
4509 | if (partial == 0) | |
f2e38ebe | 4510 | arg->value = arg->stack_slot; |
66d433c7 | 4511 | |
4512 | /* Once we have pushed something, pops can't safely | |
4513 | be deferred during the rest of the arguments. */ | |
4514 | NO_DEFER_POP; | |
4515 | ||
4516 | /* ANSI doesn't require a sequence point here, | |
4517 | but PCC has one, so this will avoid some problems. */ | |
4518 | emit_queue (); | |
4519 | ||
148b08de | 4520 | /* Free any temporary slots made in processing this argument. Show |
4521 | that we might have taken the address of something and pushed that | |
4522 | as an operand. */ | |
4523 | preserve_temp_slots (NULL_RTX); | |
66d433c7 | 4524 | free_temp_slots (); |
1b117c60 | 4525 | pop_temp_slots (); |
57679d39 | 4526 | |
4527 | return sibcall_failure; | |
66d433c7 | 4528 | } |