Mercurial > hg > CbC > CbC_gcc
annotate gcc/function.h @ 67:f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
| author | nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp> |
|---|---|
| date | Tue, 22 Mar 2011 17:18:12 +0900 |
| parents | b7f97abdc517 |
| children | 04ced10e8804 |
| rev | line source |
|---|---|
| 0 | 1 /* Structure for saving state for a nested function. |
| 2 Copyright (C) 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998, | |
|
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3 1999, 2000, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 |
| 0 | 4 Free Software Foundation, Inc. |
| 5 | |
| 6 This file is part of GCC. | |
| 7 | |
| 8 GCC is free software; you can redistribute it and/or modify it under | |
| 9 the terms of the GNU General Public License as published by the Free | |
| 10 Software Foundation; either version 3, or (at your option) any later | |
| 11 version. | |
| 12 | |
| 13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY | |
| 14 WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 16 for more details. | |
| 17 | |
| 18 You should have received a copy of the GNU General Public License | |
| 19 along with GCC; see the file COPYING3. If not see | |
| 20 <http://www.gnu.org/licenses/>. */ | |
| 21 | |
| 22 #ifndef GCC_FUNCTION_H | |
| 23 #define GCC_FUNCTION_H | |
| 24 | |
| 25 #include "tree.h" | |
| 26 #include "hashtab.h" | |
|
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27 #include "vecprim.h" |
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28 #include "tm.h" /* For CUMULATIVE_ARGS. */ |
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29 #include "hard-reg-set.h" |
| 0 | 30 |
| 31 /* Stack of pending (incomplete) sequences saved by `start_sequence'. | |
| 32 Each element describes one pending sequence. | |
| 33 The main insn-chain is saved in the last element of the chain, | |
| 34 unless the chain is empty. */ | |
| 35 | |
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36 struct GTY(()) sequence_stack { |
| 0 | 37 /* First and last insns in the chain of the saved sequence. */ |
| 38 rtx first; | |
| 39 rtx last; | |
| 40 struct sequence_stack *next; | |
| 41 }; | |
| 42 | |
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43 struct GTY(()) emit_status { |
| 0 | 44 /* This is reset to LAST_VIRTUAL_REGISTER + 1 at the start of each function. |
| 45 After rtl generation, it is 1 plus the largest register number used. */ | |
| 46 int x_reg_rtx_no; | |
| 47 | |
| 48 /* Lowest label number in current function. */ | |
| 49 int x_first_label_num; | |
| 50 | |
| 51 /* The ends of the doubly-linked chain of rtl for the current function. | |
| 52 Both are reset to null at the start of rtl generation for the function. | |
| 53 | |
| 54 start_sequence saves both of these on `sequence_stack' and then starts | |
| 55 a new, nested sequence of insns. */ | |
| 56 rtx x_first_insn; | |
| 57 rtx x_last_insn; | |
| 58 | |
| 59 /* Stack of pending (incomplete) sequences saved by `start_sequence'. | |
| 60 Each element describes one pending sequence. | |
| 61 The main insn-chain is saved in the last element of the chain, | |
| 62 unless the chain is empty. */ | |
| 63 struct sequence_stack *sequence_stack; | |
| 64 | |
| 65 /* INSN_UID for next insn emitted. | |
| 66 Reset to 1 for each function compiled. */ | |
| 67 int x_cur_insn_uid; | |
| 68 | |
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69 /* INSN_UID for next debug insn emitted. Only used if |
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70 --param min-nondebug-insn-uid=<value> is given with nonzero value. */ |
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71 int x_cur_debug_insn_uid; |
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72 |
| 0 | 73 /* Location the last line-number NOTE emitted. |
| 74 This is used to avoid generating duplicates. */ | |
| 75 location_t x_last_location; | |
| 76 | |
| 77 /* The length of the regno_pointer_align, regno_decl, and x_regno_reg_rtx | |
| 78 vectors. Since these vectors are needed during the expansion phase when | |
| 79 the total number of registers in the function is not yet known, the | |
| 80 vectors are copied and made bigger when necessary. */ | |
| 81 int regno_pointer_align_length; | |
| 82 | |
| 83 /* Indexed by pseudo register number, if nonzero gives the known alignment | |
| 84 for that pseudo (if REG_POINTER is set in x_regno_reg_rtx). | |
| 85 Allocated in parallel with x_regno_reg_rtx. */ | |
| 86 unsigned char * GTY((skip)) regno_pointer_align; | |
| 87 }; | |
| 88 | |
| 89 | |
| 90 /* Indexed by pseudo register number, gives the rtx for that pseudo. | |
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91 Allocated in parallel with regno_pointer_align. |
| 0 | 92 FIXME: We could put it into emit_status struct, but gengtype is not able to deal |
| 93 with length attribute nested in top level structures. */ | |
| 94 | |
| 95 extern GTY ((length ("crtl->emit.x_reg_rtx_no"))) rtx * regno_reg_rtx; | |
| 96 | |
| 97 /* For backward compatibility... eventually these should all go away. */ | |
| 98 #define reg_rtx_no (crtl->emit.x_reg_rtx_no) | |
| 99 #define seq_stack (crtl->emit.sequence_stack) | |
| 100 | |
| 101 #define REGNO_POINTER_ALIGN(REGNO) (crtl->emit.regno_pointer_align[REGNO]) | |
| 102 | |
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103 struct GTY(()) expr_status { |
| 0 | 104 /* Number of units that we should eventually pop off the stack. |
| 105 These are the arguments to function calls that have already returned. */ | |
| 106 int x_pending_stack_adjust; | |
| 107 | |
| 108 /* Under some ABIs, it is the caller's responsibility to pop arguments | |
| 109 pushed for function calls. A naive implementation would simply pop | |
| 110 the arguments immediately after each call. However, if several | |
| 111 function calls are made in a row, it is typically cheaper to pop | |
| 112 all the arguments after all of the calls are complete since a | |
| 113 single pop instruction can be used. Therefore, GCC attempts to | |
| 114 defer popping the arguments until absolutely necessary. (For | |
| 115 example, at the end of a conditional, the arguments must be popped, | |
| 116 since code outside the conditional won't know whether or not the | |
| 117 arguments need to be popped.) | |
| 118 | |
| 119 When INHIBIT_DEFER_POP is nonzero, however, the compiler does not | |
| 120 attempt to defer pops. Instead, the stack is popped immediately | |
| 121 after each call. Rather then setting this variable directly, use | |
| 122 NO_DEFER_POP and OK_DEFER_POP. */ | |
| 123 int x_inhibit_defer_pop; | |
| 124 | |
| 125 /* If PREFERRED_STACK_BOUNDARY and PUSH_ROUNDING are defined, the stack | |
| 126 boundary can be momentarily unaligned while pushing the arguments. | |
| 127 Record the delta since last aligned boundary here in order to get | |
| 128 stack alignment in the nested function calls working right. */ | |
| 129 int x_stack_pointer_delta; | |
| 130 | |
| 131 /* Nonzero means __builtin_saveregs has already been done in this function. | |
| 132 The value is the pseudoreg containing the value __builtin_saveregs | |
| 133 returned. */ | |
| 134 rtx x_saveregs_value; | |
| 135 | |
| 136 /* Similarly for __builtin_apply_args. */ | |
| 137 rtx x_apply_args_value; | |
| 138 | |
| 139 /* List of labels that must never be deleted. */ | |
| 140 rtx x_forced_labels; | |
| 141 }; | |
| 142 | |
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143 typedef struct call_site_record_d *call_site_record; |
| 0 | 144 DEF_VEC_P(call_site_record); |
| 145 DEF_VEC_ALLOC_P(call_site_record, gc); | |
| 146 | |
| 147 /* RTL representation of exception handling. */ | |
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148 struct GTY(()) rtl_eh { |
| 0 | 149 rtx ehr_stackadj; |
| 150 rtx ehr_handler; | |
| 151 rtx ehr_label; | |
| 152 | |
| 153 rtx sjlj_fc; | |
| 154 rtx sjlj_exit_after; | |
| 155 | |
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156 VEC(uchar,gc) *action_record_data; |
| 0 | 157 |
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158 VEC(call_site_record,gc) *call_site_record[2]; |
| 0 | 159 }; |
| 160 | |
| 161 #define pending_stack_adjust (crtl->expr.x_pending_stack_adjust) | |
| 162 #define inhibit_defer_pop (crtl->expr.x_inhibit_defer_pop) | |
| 163 #define saveregs_value (crtl->expr.x_saveregs_value) | |
| 164 #define apply_args_value (crtl->expr.x_apply_args_value) | |
| 165 #define forced_labels (crtl->expr.x_forced_labels) | |
| 166 #define stack_pointer_delta (crtl->expr.x_stack_pointer_delta) | |
| 167 | |
| 168 struct gimple_df; | |
| 169 struct temp_slot; | |
| 170 typedef struct temp_slot *temp_slot_p; | |
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171 struct call_site_record_d; |
| 0 | 172 |
| 173 DEF_VEC_P(temp_slot_p); | |
| 174 DEF_VEC_ALLOC_P(temp_slot_p,gc); | |
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175 struct ipa_opt_pass_d; |
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176 typedef struct ipa_opt_pass_d *ipa_opt_pass; |
| 0 | 177 |
| 178 DEF_VEC_P(ipa_opt_pass); | |
| 179 DEF_VEC_ALLOC_P(ipa_opt_pass,heap); | |
| 180 | |
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181 struct GTY(()) varasm_status { |
| 0 | 182 /* If we're using a per-function constant pool, this is it. */ |
| 183 struct rtx_constant_pool *pool; | |
| 184 | |
| 185 /* Number of tree-constants deferred during the expansion of this | |
| 186 function. */ | |
| 187 unsigned int deferred_constants; | |
| 188 }; | |
| 189 | |
| 190 /* Information mainlined about RTL representation of incoming arguments. */ | |
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191 struct GTY(()) incoming_args { |
| 0 | 192 /* Number of bytes of args popped by function being compiled on its return. |
| 193 Zero if no bytes are to be popped. | |
| 194 May affect compilation of return insn or of function epilogue. */ | |
| 195 int pops_args; | |
| 196 | |
| 197 /* If function's args have a fixed size, this is that size, in bytes. | |
| 198 Otherwise, it is -1. | |
| 199 May affect compilation of return insn or of function epilogue. */ | |
| 200 int size; | |
| 201 | |
| 202 /* # bytes the prologue should push and pretend that the caller pushed them. | |
| 203 The prologue must do this, but only if parms can be passed in | |
| 204 registers. */ | |
| 205 int pretend_args_size; | |
| 206 | |
| 207 /* This is the offset from the arg pointer to the place where the first | |
| 208 anonymous arg can be found, if there is one. */ | |
| 209 rtx arg_offset_rtx; | |
| 210 | |
| 211 /* Quantities of various kinds of registers | |
| 212 used for the current function's args. */ | |
| 213 CUMULATIVE_ARGS info; | |
| 214 | |
| 215 /* The arg pointer hard register, or the pseudo into which it was copied. */ | |
| 216 rtx internal_arg_pointer; | |
| 217 }; | |
| 218 | |
| 219 /* Data for function partitioning. */ | |
|
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220 struct GTY(()) function_subsections { |
| 0 | 221 /* Assembly labels for the hot and cold text sections, to |
| 222 be used by debugger functions for determining the size of text | |
| 223 sections. */ | |
| 224 | |
| 225 const char *hot_section_label; | |
| 226 const char *cold_section_label; | |
| 227 const char *hot_section_end_label; | |
| 228 const char *cold_section_end_label; | |
| 229 }; | |
| 230 | |
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231 /* Describe an empty area of space in the stack frame. These can be chained |
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232 into a list; this is used to keep track of space wasted for alignment |
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233 reasons. */ |
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234 struct GTY(()) frame_space |
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235 { |
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236 struct frame_space *next; |
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237 |
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238 HOST_WIDE_INT start; |
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239 HOST_WIDE_INT length; |
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240 }; |
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241 |
| 0 | 242 /* Datastructures maintained for currently processed function in RTL form. */ |
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243 struct GTY(()) rtl_data { |
| 0 | 244 struct expr_status expr; |
| 245 struct emit_status emit; | |
| 246 struct varasm_status varasm; | |
| 247 struct incoming_args args; | |
| 248 struct function_subsections subsections; | |
| 249 struct rtl_eh eh; | |
| 250 | |
| 251 /* For function.c */ | |
| 252 | |
| 253 /* # of bytes of outgoing arguments. If ACCUMULATE_OUTGOING_ARGS is | |
| 254 defined, the needed space is pushed by the prologue. */ | |
| 255 int outgoing_args_size; | |
| 256 | |
| 257 /* If nonzero, an RTL expression for the location at which the current | |
| 258 function returns its result. If the current function returns its | |
| 259 result in a register, current_function_return_rtx will always be | |
| 260 the hard register containing the result. */ | |
| 261 rtx return_rtx; | |
| 262 | |
| 263 /* Opaque pointer used by get_hard_reg_initial_val and | |
| 264 has_hard_reg_initial_val (see integrate.[hc]). */ | |
| 265 struct initial_value_struct *hard_reg_initial_vals; | |
| 266 | |
| 267 /* A variable living at the top of the frame that holds a known value. | |
| 268 Used for detecting stack clobbers. */ | |
| 269 tree stack_protect_guard; | |
| 270 | |
| 271 /* List (chain of EXPR_LIST) of labels heading the current handlers for | |
| 272 nonlocal gotos. */ | |
| 273 rtx x_nonlocal_goto_handler_labels; | |
| 274 | |
| 275 /* Label that will go on function epilogue. | |
| 276 Jumping to this label serves as a "return" instruction | |
| 277 on machines which require execution of the epilogue on all returns. */ | |
| 278 rtx x_return_label; | |
| 279 | |
| 280 /* Label that will go on the end of function epilogue. | |
| 281 Jumping to this label serves as a "naked return" instruction | |
| 282 on machines which require execution of the epilogue on all returns. */ | |
| 283 rtx x_naked_return_label; | |
| 284 | |
| 285 /* List (chain of EXPR_LISTs) of all stack slots in this function. | |
| 286 Made for the sake of unshare_all_rtl. */ | |
| 287 rtx x_stack_slot_list; | |
| 288 | |
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289 /* List of empty areas in the stack frame. */ |
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290 struct frame_space *frame_space_list; |
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291 |
| 0 | 292 /* Place after which to insert the tail_recursion_label if we need one. */ |
| 293 rtx x_stack_check_probe_note; | |
| 294 | |
| 295 /* Location at which to save the argument pointer if it will need to be | |
| 296 referenced. There are two cases where this is done: if nonlocal gotos | |
| 297 exist, or if vars stored at an offset from the argument pointer will be | |
| 298 needed by inner routines. */ | |
| 299 rtx x_arg_pointer_save_area; | |
| 300 | |
| 301 /* Dynamic Realign Argument Pointer used for realigning stack. */ | |
| 302 rtx drap_reg; | |
| 303 | |
| 304 /* Offset to end of allocated area of stack frame. | |
| 305 If stack grows down, this is the address of the last stack slot allocated. | |
| 306 If stack grows up, this is the address for the next slot. */ | |
| 307 HOST_WIDE_INT x_frame_offset; | |
| 308 | |
| 309 /* Insn after which register parms and SAVE_EXPRs are born, if nonopt. */ | |
| 310 rtx x_parm_birth_insn; | |
| 311 | |
| 312 /* List of all used temporaries allocated, by level. */ | |
| 313 VEC(temp_slot_p,gc) *x_used_temp_slots; | |
| 314 | |
| 315 /* List of available temp slots. */ | |
| 316 struct temp_slot *x_avail_temp_slots; | |
| 317 | |
| 318 /* Current nesting level for temporaries. */ | |
| 319 int x_temp_slot_level; | |
| 320 | |
| 321 /* The largest alignment needed on the stack, including requirement | |
| 322 for outgoing stack alignment. */ | |
| 323 unsigned int stack_alignment_needed; | |
| 324 | |
| 325 /* Preferred alignment of the end of stack frame, which is preferred | |
| 326 to call other functions. */ | |
| 327 unsigned int preferred_stack_boundary; | |
| 328 | |
| 329 /* The minimum alignment of parameter stack. */ | |
| 330 unsigned int parm_stack_boundary; | |
| 331 | |
| 332 /* The largest alignment of slot allocated on the stack. */ | |
| 333 unsigned int max_used_stack_slot_alignment; | |
| 334 | |
| 335 /* The stack alignment estimated before reload, with consideration of | |
| 336 following factors: | |
| 337 1. Alignment of local stack variables (max_used_stack_slot_alignment) | |
|
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338 2. Alignment requirement to call other functions |
| 0 | 339 (preferred_stack_boundary) |
| 340 3. Alignment of non-local stack variables but might be spilled in | |
| 341 local stack. */ | |
| 342 unsigned int stack_alignment_estimated; | |
| 343 | |
| 344 /* For reorg. */ | |
| 345 | |
| 346 /* If some insns can be deferred to the delay slots of the epilogue, the | |
| 347 delay list for them is recorded here. */ | |
| 348 rtx epilogue_delay_list; | |
| 349 | |
| 350 /* Nonzero if function being compiled called builtin_return_addr or | |
| 351 builtin_frame_address with nonzero count. */ | |
| 352 bool accesses_prior_frames; | |
| 353 | |
| 354 /* Nonzero if the function calls __builtin_eh_return. */ | |
| 355 bool calls_eh_return; | |
| 356 | |
| 357 /* Nonzero if function saves all registers, e.g. if it has a nonlocal | |
| 358 label that can reach the exit block via non-exceptional paths. */ | |
| 359 bool saves_all_registers; | |
| 360 | |
| 361 /* Nonzero if function being compiled has nonlocal gotos to parent | |
| 362 function. */ | |
| 363 bool has_nonlocal_goto; | |
|
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364 |
| 0 | 365 /* Nonzero if function being compiled has an asm statement. */ |
| 366 bool has_asm_statement; | |
| 367 | |
| 368 /* This bit is used by the exception handling logic. It is set if all | |
| 369 calls (if any) are sibling calls. Such functions do not have to | |
| 370 have EH tables generated, as they cannot throw. A call to such a | |
| 371 function, however, should be treated as throwing if any of its callees | |
| 372 can throw. */ | |
| 373 bool all_throwers_are_sibcalls; | |
| 374 | |
| 375 /* Nonzero if stack limit checking should be enabled in the current | |
| 376 function. */ | |
| 377 bool limit_stack; | |
| 378 | |
| 379 /* Nonzero if profiling code should be generated. */ | |
| 380 bool profile; | |
| 381 | |
| 382 /* Nonzero if the current function uses the constant pool. */ | |
| 383 bool uses_const_pool; | |
| 384 | |
| 385 /* Nonzero if the current function uses pic_offset_table_rtx. */ | |
| 386 bool uses_pic_offset_table; | |
| 387 | |
| 388 /* Nonzero if the current function needs an lsda for exception handling. */ | |
| 389 bool uses_eh_lsda; | |
| 390 | |
| 391 /* Set when the tail call has been produced. */ | |
| 392 bool tail_call_emit; | |
| 393 | |
| 394 /* Nonzero if code to initialize arg_pointer_save_area has been emitted. */ | |
| 395 bool arg_pointer_save_area_init; | |
| 396 | |
| 397 /* Nonzero if current function must be given a frame pointer. | |
| 398 Set in global.c if anything is allocated on the stack there. */ | |
| 399 bool frame_pointer_needed; | |
| 400 | |
| 401 /* When set, expand should optimize for speed. */ | |
| 402 bool maybe_hot_insn_p; | |
| 403 | |
| 404 /* Nonzero if function stack realignment is needed. This flag may be | |
| 405 set twice: before and after reload. It is set before reload wrt | |
| 406 stack alignment estimation before reload. It will be changed after | |
| 407 reload if by then criteria of stack realignment is different. | |
| 408 The value set after reload is the accurate one and is finalized. */ | |
| 409 bool stack_realign_needed; | |
| 410 | |
| 411 /* Nonzero if function stack realignment is tried. This flag is set | |
| 412 only once before reload. It affects register elimination. This | |
| 413 is used to generate DWARF debug info for stack variables. */ | |
| 414 bool stack_realign_tried; | |
| 415 | |
| 416 /* Nonzero if function being compiled needs dynamic realigned | |
| 417 argument pointer (drap) if stack needs realigning. */ | |
| 418 bool need_drap; | |
| 419 | |
| 420 /* Nonzero if function stack realignment estimation is done, namely | |
| 421 stack_realign_needed flag has been set before reload wrt estimated | |
| 422 stack alignment info. */ | |
| 423 bool stack_realign_processed; | |
| 424 | |
| 425 /* Nonzero if function stack realignment has been finalized, namely | |
| 426 stack_realign_needed flag has been set and finalized after reload. */ | |
| 427 bool stack_realign_finalized; | |
| 428 | |
| 429 /* True if dbr_schedule has already been called for this function. */ | |
| 430 bool dbr_scheduled_p; | |
|
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431 |
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432 /* True if current function can not throw. Unlike |
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433 TREE_NOTHROW (current_function_decl) it is set even for overwritable |
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434 function where currently compiled version of it is nothrow. */ |
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435 bool nothrow; |
|
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436 |
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437 /* Like regs_ever_live, but 1 if a reg is set or clobbered from an |
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438 asm. Unlike regs_ever_live, elements of this array corresponding |
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439 to eliminable regs (like the frame pointer) are set if an asm |
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440 sets them. */ |
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441 HARD_REG_SET asm_clobbers; |
| 0 | 442 }; |
| 443 | |
| 444 #define return_label (crtl->x_return_label) | |
| 445 #define naked_return_label (crtl->x_naked_return_label) | |
| 446 #define stack_slot_list (crtl->x_stack_slot_list) | |
| 447 #define parm_birth_insn (crtl->x_parm_birth_insn) | |
| 448 #define frame_offset (crtl->x_frame_offset) | |
| 449 #define stack_check_probe_note (crtl->x_stack_check_probe_note) | |
| 450 #define arg_pointer_save_area (crtl->x_arg_pointer_save_area) | |
| 451 #define used_temp_slots (crtl->x_used_temp_slots) | |
| 452 #define avail_temp_slots (crtl->x_avail_temp_slots) | |
| 453 #define temp_slot_level (crtl->x_temp_slot_level) | |
| 454 #define nonlocal_goto_handler_labels (crtl->x_nonlocal_goto_handler_labels) | |
| 455 #define frame_pointer_needed (crtl->frame_pointer_needed) | |
| 456 #define stack_realign_fp (crtl->stack_realign_needed && !crtl->need_drap) | |
| 457 #define stack_realign_drap (crtl->stack_realign_needed && crtl->need_drap) | |
| 458 | |
| 459 extern GTY(()) struct rtl_data x_rtl; | |
| 460 | |
| 461 /* Accessor to RTL datastructures. We keep them statically allocated now since | |
| 462 we never keep multiple functions. For threaded compiler we might however | |
| 463 want to do differently. */ | |
| 464 #define crtl (&x_rtl) | |
| 465 | |
|
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466 struct GTY(()) stack_usage |
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467 { |
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468 /* # of bytes of static stack space allocated by the function. */ |
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469 HOST_WIDE_INT static_stack_size; |
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470 |
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471 /* # of bytes of dynamic stack space allocated by the function. This is |
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472 meaningful only if has_unbounded_dynamic_stack_size is zero. */ |
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473 HOST_WIDE_INT dynamic_stack_size; |
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474 |
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475 /* # of bytes of space pushed onto the stack after the prologue. If |
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476 !ACCUMULATE_OUTGOING_ARGS, it contains the outgoing arguments. */ |
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477 int pushed_stack_size; |
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478 |
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479 /* # of dynamic allocations in the function. */ |
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480 unsigned int dynamic_alloc_count : 31; |
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481 |
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482 /* Nonzero if the amount of stack space allocated dynamically cannot |
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483 be bounded at compile-time. */ |
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484 unsigned int has_unbounded_dynamic_stack_size : 1; |
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485 }; |
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486 |
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487 #define current_function_static_stack_size (cfun->su->static_stack_size) |
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488 #define current_function_dynamic_stack_size (cfun->su->dynamic_stack_size) |
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489 #define current_function_pushed_stack_size (cfun->su->pushed_stack_size) |
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490 #define current_function_dynamic_alloc_count (cfun->su->dynamic_alloc_count) |
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491 #define current_function_has_unbounded_dynamic_stack_size \ |
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492 (cfun->su->has_unbounded_dynamic_stack_size) |
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493 #define current_function_allocates_dynamic_stack_space \ |
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494 (current_function_dynamic_stack_size != 0 \ |
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495 || current_function_has_unbounded_dynamic_stack_size) |
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496 |
| 0 | 497 /* This structure can save all the important global and static variables |
| 498 describing the status of the current function. */ | |
| 499 | |
|
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500 struct GTY(()) function { |
| 0 | 501 struct eh_status *eh; |
| 502 | |
| 503 /* The control flow graph for this function. */ | |
| 504 struct control_flow_graph *cfg; | |
| 505 | |
| 506 /* GIMPLE body for this function. */ | |
| 507 struct gimple_seq_d *gimple_body; | |
| 508 | |
| 509 /* SSA and dataflow information. */ | |
| 510 struct gimple_df *gimple_df; | |
| 511 | |
| 512 /* The loops in this function. */ | |
| 513 struct loops *x_current_loops; | |
| 514 | |
|
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515 /* The stack usage of this function. */ |
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516 struct stack_usage *su; |
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517 |
| 0 | 518 /* Value histograms attached to particular statements. */ |
| 519 htab_t GTY((skip)) value_histograms; | |
| 520 | |
| 521 /* For function.c. */ | |
| 522 | |
| 523 /* Points to the FUNCTION_DECL of this function. */ | |
| 524 tree decl; | |
| 525 | |
| 526 /* A PARM_DECL that should contain the static chain for this function. | |
| 527 It will be initialized at the beginning of the function. */ | |
| 528 tree static_chain_decl; | |
| 529 | |
| 530 /* An expression that contains the non-local goto save area. The first | |
|
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531 word is the saved frame pointer and the second is the saved stack |
| 0 | 532 pointer. */ |
| 533 tree nonlocal_goto_save_area; | |
| 534 | |
|
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535 /* Vector of function local variables, functions, types and constants. */ |
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536 VEC(tree,gc) *local_decls; |
| 0 | 537 |
| 538 /* For md files. */ | |
| 539 | |
| 540 /* tm.h can use this to store whatever it likes. */ | |
| 541 struct machine_function * GTY ((maybe_undef)) machine; | |
| 542 | |
| 543 /* Language-specific code can use this to store whatever it likes. */ | |
| 544 struct language_function * language; | |
| 545 | |
| 546 /* Used types hash table. */ | |
| 547 htab_t GTY ((param_is (union tree_node))) used_types_hash; | |
| 548 | |
| 549 /* Last statement uid. */ | |
| 550 int last_stmt_uid; | |
| 551 | |
| 552 /* Function sequence number for profiling, debugging, etc. */ | |
| 553 int funcdef_no; | |
| 554 | |
| 555 /* Line number of the start of the function for debugging purposes. */ | |
| 556 location_t function_start_locus; | |
| 557 | |
| 558 /* Line number of the end of the function. */ | |
| 559 location_t function_end_locus; | |
| 560 | |
| 561 /* Properties used by the pass manager. */ | |
| 562 unsigned int curr_properties; | |
| 563 unsigned int last_verified; | |
|
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564 |
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565 /* Non-null if the function does something that would prevent it from |
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566 being copied; this applies to both versioning and inlining. Set to |
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567 a string describing the reason for failure. */ |
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568 const char * GTY((skip)) cannot_be_copied_reason; |
| 0 | 569 |
| 570 /* Collected bit flags. */ | |
| 571 | |
| 572 /* Number of units of general registers that need saving in stdarg | |
| 573 function. What unit is depends on the backend, either it is number | |
| 574 of bytes, or it can be number of registers. */ | |
| 575 unsigned int va_list_gpr_size : 8; | |
| 576 | |
| 577 /* Number of units of floating point registers that need saving in stdarg | |
| 578 function. */ | |
| 579 unsigned int va_list_fpr_size : 8; | |
| 580 | |
| 581 /* Nonzero if function being compiled can call setjmp. */ | |
| 582 unsigned int calls_setjmp : 1; | |
| 583 | |
| 584 /* Nonzero if function being compiled can call alloca, | |
| 585 either as a subroutine or builtin. */ | |
| 586 unsigned int calls_alloca : 1; | |
| 587 | |
| 588 /* Nonzero if function being compiled receives nonlocal gotos | |
| 589 from nested functions. */ | |
| 590 unsigned int has_nonlocal_label : 1; | |
| 591 | |
|
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592 /* Nonzero if we've set cannot_be_copied_reason. I.e. if |
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593 (cannot_be_copied_set && !cannot_be_copied_reason), the function |
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594 can in fact be copied. */ |
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595 unsigned int cannot_be_copied_set : 1; |
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596 |
| 0 | 597 /* Nonzero if current function uses stdarg.h or equivalent. */ |
| 598 unsigned int stdarg : 1; | |
| 599 | |
| 600 /* Nonzero if the back-end should not keep track of expressions that | |
| 601 determine the size of variable-sized objects. Normally, such | |
| 602 expressions are saved away, and then expanded when the next | |
| 603 function is started. For example, if a parameter has a | |
| 604 variable-sized type, then the size of the parameter is computed | |
| 605 when the function body is entered. However, some front-ends do | |
| 606 not desire this behavior. */ | |
| 607 unsigned int dont_save_pending_sizes_p : 1; | |
| 608 | |
| 609 unsigned int after_inlining : 1; | |
| 610 unsigned int always_inline_functions_inlined : 1; | |
| 611 | |
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612 /* Nonzero if function being compiled can throw synchronous non-call |
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613 exceptions. */ |
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614 unsigned int can_throw_non_call_exceptions : 1; |
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615 |
| 0 | 616 /* Fields below this point are not set for abstract functions; see |
| 617 allocate_struct_function. */ | |
| 618 | |
| 619 /* Nonzero if function being compiled needs to be given an address | |
| 620 where the value should be stored. */ | |
| 621 unsigned int returns_struct : 1; | |
| 622 | |
| 623 /* Nonzero if function being compiled needs to | |
| 624 return the address of where it has put a structure value. */ | |
| 625 unsigned int returns_pcc_struct : 1; | |
| 626 | |
| 627 /* Nonzero if pass_tree_profile was run on this function. */ | |
| 628 unsigned int after_tree_profile : 1; | |
| 629 | |
| 630 /* Nonzero if this function has local DECL_HARD_REGISTER variables. | |
| 631 In this case code motion has to be done more carefully. */ | |
| 632 unsigned int has_local_explicit_reg_vars : 1; | |
| 633 | |
| 634 /* Nonzero if the current function is a thunk, i.e., a lightweight | |
| 635 function implemented by the output_mi_thunk hook) that just | |
| 636 adjusts one of its arguments and forwards to another | |
| 637 function. */ | |
| 638 unsigned int is_thunk : 1; | |
| 639 }; | |
| 640 | |
|
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641 /* Add the decl D to the local_decls list of FUN. */ |
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642 |
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643 static inline void |
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644 add_local_decl (struct function *fun, tree d) |
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645 { |
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646 VEC_safe_push (tree, gc, fun->local_decls, d); |
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647 } |
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648 |
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649 #define FOR_EACH_LOCAL_DECL(FUN, I, D) \ |
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650 FOR_EACH_VEC_ELT_REVERSE (tree, (FUN)->local_decls, I, D) |
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651 |
| 0 | 652 /* If va_list_[gf]pr_size is set to this, it means we don't know how |
| 653 many units need to be saved. */ | |
| 654 #define VA_LIST_MAX_GPR_SIZE 255 | |
| 655 #define VA_LIST_MAX_FPR_SIZE 255 | |
| 656 | |
| 657 /* The function currently being compiled. */ | |
| 658 extern GTY(()) struct function *cfun; | |
| 659 | |
| 660 /* In order to ensure that cfun is not set directly, we redefine it so | |
| 661 that it is not an lvalue. Rather than assign to cfun, use | |
| 662 push_cfun or set_cfun. */ | |
| 663 #define cfun (cfun + 0) | |
| 664 | |
| 665 /* Nonzero if we've already converted virtual regs to hard regs. */ | |
| 666 extern int virtuals_instantiated; | |
| 667 | |
| 668 /* Nonzero if at least one trampoline has been created. */ | |
| 669 extern int trampolines_created; | |
| 670 | |
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671 struct GTY(()) types_used_by_vars_entry { |
| 36 | 672 tree type; |
| 673 tree var_decl; | |
| 674 }; | |
| 675 | |
| 676 /* Hash table making the relationship between a global variable | |
| 677 and the types it references in its initializer. The key of the | |
| 678 entry is a referenced type, and the value is the DECL of the global | |
| 679 variable. types_use_by_vars_do_hash and types_used_by_vars_eq below are | |
| 680 the hash and equality functions to use for this hash table. */ | |
| 681 extern GTY((param_is (struct types_used_by_vars_entry))) htab_t | |
| 682 types_used_by_vars_hash; | |
| 683 | |
| 684 hashval_t types_used_by_vars_do_hash (const void*); | |
| 685 int types_used_by_vars_eq (const void *, const void *); | |
| 686 void types_used_by_var_decl_insert (tree type, tree var_decl); | |
| 687 | |
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688 /* During parsing of a global variable, this vector contains the types |
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689 referenced by the global variable. */ |
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690 extern GTY(()) VEC(tree,gc) *types_used_by_cur_var_decl; |
| 36 | 691 |
| 692 | |
| 0 | 693 /* cfun shouldn't be set directly; use one of these functions instead. */ |
| 694 extern void set_cfun (struct function *new_cfun); | |
| 695 extern void push_cfun (struct function *new_cfun); | |
| 696 extern void pop_cfun (void); | |
| 697 extern void instantiate_decl_rtl (rtx x); | |
| 698 | |
| 699 /* For backward compatibility... eventually these should all go away. */ | |
| 700 #define current_function_funcdef_no (cfun->funcdef_no) | |
| 701 | |
| 702 #define current_loops (cfun->x_current_loops) | |
| 703 #define dom_computed (cfun->cfg->x_dom_computed) | |
| 704 #define n_bbs_in_dom_tree (cfun->cfg->x_n_bbs_in_dom_tree) | |
| 705 #define VALUE_HISTOGRAMS(fun) (fun)->value_histograms | |
| 706 | |
| 707 /* Identify BLOCKs referenced by more than one NOTE_INSN_BLOCK_{BEG,END}, | |
| 708 and create duplicate blocks. */ | |
| 709 extern void reorder_blocks (void); | |
| 710 | |
| 711 /* Set BLOCK_NUMBER for all the blocks in FN. */ | |
| 712 extern void number_blocks (tree); | |
| 713 | |
| 714 extern void clear_block_marks (tree); | |
| 715 extern tree blocks_nreverse (tree); | |
| 716 | |
| 717 /* Return size needed for stack frame based on slots so far allocated. | |
| 718 This size counts from zero. It is not rounded to STACK_BOUNDARY; | |
| 719 the caller may have to do that. */ | |
| 720 extern HOST_WIDE_INT get_frame_size (void); | |
| 721 | |
| 722 /* Issue an error message and return TRUE if frame OFFSET overflows in | |
| 723 the signed target pointer arithmetics for function FUNC. Otherwise | |
| 724 return FALSE. */ | |
| 725 extern bool frame_offset_overflow (HOST_WIDE_INT, tree); | |
| 726 | |
| 727 /* A pointer to a function to create target specific, per-function | |
| 728 data structures. */ | |
| 729 extern struct machine_function * (*init_machine_status) (void); | |
| 730 | |
| 731 /* Save and restore status information for a nested function. */ | |
| 732 extern void free_after_parsing (struct function *); | |
| 733 extern void free_after_compilation (struct function *); | |
| 734 | |
| 735 extern void init_varasm_status (void); | |
| 736 | |
| 737 #ifdef RTX_CODE | |
| 738 extern void diddle_return_value (void (*)(rtx, void*), void*); | |
| 739 extern void clobber_return_register (void); | |
| 740 #endif | |
| 741 | |
| 742 extern rtx get_arg_pointer_save_area (void); | |
| 743 | |
| 744 /* Returns the name of the current function. */ | |
| 745 extern const char *current_function_name (void); | |
| 746 | |
| 747 extern void do_warn_unused_parameter (tree); | |
| 748 | |
| 749 extern bool pass_by_reference (CUMULATIVE_ARGS *, enum machine_mode, | |
| 750 tree, bool); | |
| 751 extern bool reference_callee_copied (CUMULATIVE_ARGS *, enum machine_mode, | |
| 752 tree, bool); | |
| 753 | |
| 754 extern void used_types_insert (tree); | |
| 755 | |
| 756 extern int get_next_funcdef_no (void); | |
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757 |
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758 /* In predict.c */ |
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759 extern bool optimize_function_for_size_p (struct function *); |
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760 extern bool optimize_function_for_speed_p (struct function *); |
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761 |
| 0 | 762 #endif /* GCC_FUNCTION_H */ |