1/* Definitions for code generation pass of GNU compiler. 2 Copyright (C) 1987, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 3 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 4 Free Software Foundation, Inc. 5 6This file is part of GCC. 7 8GCC is free software; you can redistribute it and/or modify it under 9the terms of the GNU General Public License as published by the Free 10Software Foundation; either version 3, or (at your option) any later 11version. 12 13GCC is distributed in the hope that it will be useful, but WITHOUT ANY 14WARRANTY; without even the implied warranty of MERCHANTABILITY or 15FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 16for more details. 17 18You should have received a copy of the GNU General Public License 19along with GCC; see the file COPYING3. If not see 20<http://www.gnu.org/licenses/>. */ 21 22#ifndef GCC_EXPR_H 23#define GCC_EXPR_H 24 25/* For inhibit_defer_pop */ 26#include "function.h" 27/* For XEXP, GEN_INT, rtx_code */ 28#include "rtl.h" 29/* For optimize_size */ 30#include "flags.h" 31/* For host_integerp, tree_low_cst, fold_convert, size_binop, ssize_int, 32 TREE_CODE, TYPE_SIZE, int_size_in_bytes, */ 33#include "tree.h" 34/* For GET_MODE_BITSIZE, word_mode */ 35#include "machmode.h" 36 37/* The default branch cost is 1. */ 38#ifndef BRANCH_COST 39#define BRANCH_COST(speed_p, predictable_p) 1 40#endif 41 42/* This is the 4th arg to `expand_expr'. 43 EXPAND_STACK_PARM means we are possibly expanding a call param onto 44 the stack. 45 EXPAND_SUM means it is ok to return a PLUS rtx or MULT rtx. 46 EXPAND_INITIALIZER is similar but also record any labels on forced_labels. 47 EXPAND_CONST_ADDRESS means it is ok to return a MEM whose address 48 is a constant that is not a legitimate address. 49 EXPAND_WRITE means we are only going to write to the resulting rtx. 50 EXPAND_MEMORY means we are interested in a memory result, even if 51 the memory is constant and we could have propagated a constant value. */ 52enum expand_modifier {EXPAND_NORMAL = 0, EXPAND_STACK_PARM, EXPAND_SUM, 53 EXPAND_CONST_ADDRESS, EXPAND_INITIALIZER, EXPAND_WRITE, 54 EXPAND_MEMORY}; 55 56/* Prevent the compiler from deferring stack pops. See 57 inhibit_defer_pop for more information. */ 58#define NO_DEFER_POP (inhibit_defer_pop += 1) 59 60/* Allow the compiler to defer stack pops. See inhibit_defer_pop for 61 more information. */ 62#define OK_DEFER_POP (inhibit_defer_pop -= 1) 63 64/* If a memory-to-memory move would take MOVE_RATIO or more simple 65 move-instruction sequences, we will do a movmem or libcall instead. */ 66 67#ifndef MOVE_RATIO 68#if defined (HAVE_movmemqi) || defined (HAVE_movmemhi) || defined (HAVE_movmemsi) || defined (HAVE_movmemdi) || defined (HAVE_movmemti) 69#define MOVE_RATIO(speed) 2 70#else 71/* If we are optimizing for space (-Os), cut down the default move ratio. */ 72#define MOVE_RATIO(speed) ((speed) ? 15 : 3) 73#endif 74#endif 75 76/* If a clear memory operation would take CLEAR_RATIO or more simple 77 move-instruction sequences, we will do a setmem or libcall instead. */ 78 79#ifndef CLEAR_RATIO 80#if defined (HAVE_setmemqi) || defined (HAVE_setmemhi) || defined (HAVE_setmemsi) || defined (HAVE_setmemdi) || defined (HAVE_setmemti) 81#define CLEAR_RATIO(speed) 2 82#else 83/* If we are optimizing for space, cut down the default clear ratio. */ 84#define CLEAR_RATIO(speed) ((speed) ? 15 :3) 85#endif 86#endif 87 88/* If a memory set (to value other than zero) operation would take 89 SET_RATIO or more simple move-instruction sequences, we will do a movmem 90 or libcall instead. */ 91#ifndef SET_RATIO 92#define SET_RATIO(speed) MOVE_RATIO(speed) 93#endif 94 95enum direction {none, upward, downward}; 96 97/* Structure to record the size of a sequence of arguments 98 as the sum of a tree-expression and a constant. This structure is 99 also used to store offsets from the stack, which might be negative, 100 so the variable part must be ssizetype, not sizetype. */ 101 102struct args_size 103{ 104 HOST_WIDE_INT constant; 105 tree var; 106}; 107 108/* Package up various arg related fields of struct args for 109 locate_and_pad_parm. */ 110struct locate_and_pad_arg_data 111{ 112 /* Size of this argument on the stack, rounded up for any padding it 113 gets. If REG_PARM_STACK_SPACE is defined, then register parms are 114 counted here, otherwise they aren't. */ 115 struct args_size size; 116 /* Offset of this argument from beginning of stack-args. */ 117 struct args_size offset; 118 /* Offset to the start of the stack slot. Different from OFFSET 119 if this arg pads downward. */ 120 struct args_size slot_offset; 121 /* The amount that the stack pointer needs to be adjusted to 122 force alignment for the next argument. */ 123 struct args_size alignment_pad; 124 /* Which way we should pad this arg. */ 125 enum direction where_pad; 126 /* slot_offset is at least this aligned. */ 127 unsigned int boundary; 128}; 129 130/* Add the value of the tree INC to the `struct args_size' TO. */ 131 132#define ADD_PARM_SIZE(TO, INC) \ 133do { \ 134 tree inc = (INC); \ 135 if (host_integerp (inc, 0)) \ 136 (TO).constant += tree_low_cst (inc, 0); \ 137 else if ((TO).var == 0) \ 138 (TO).var = fold_convert (ssizetype, inc); \ 139 else \ 140 (TO).var = size_binop (PLUS_EXPR, (TO).var, \ 141 fold_convert (ssizetype, inc)); \ 142} while (0) 143 144#define SUB_PARM_SIZE(TO, DEC) \ 145do { \ 146 tree dec = (DEC); \ 147 if (host_integerp (dec, 0)) \ 148 (TO).constant -= tree_low_cst (dec, 0); \ 149 else if ((TO).var == 0) \ 150 (TO).var = size_binop (MINUS_EXPR, ssize_int (0), \ 151 fold_convert (ssizetype, dec)); \ 152 else \ 153 (TO).var = size_binop (MINUS_EXPR, (TO).var, \ 154 fold_convert (ssizetype, dec)); \ 155} while (0) 156 157/* Convert the implicit sum in a `struct args_size' into a tree 158 of type ssizetype. */ 159#define ARGS_SIZE_TREE(SIZE) \ 160((SIZE).var == 0 ? ssize_int ((SIZE).constant) \ 161 : size_binop (PLUS_EXPR, fold_convert (ssizetype, (SIZE).var), \ 162 ssize_int ((SIZE).constant))) 163 164/* Convert the implicit sum in a `struct args_size' into an rtx. */ 165#define ARGS_SIZE_RTX(SIZE) \ 166((SIZE).var == 0 ? GEN_INT ((SIZE).constant) \ 167 : expand_normal (ARGS_SIZE_TREE (SIZE))) 168 169/* Supply a default definition for FUNCTION_ARG_PADDING: 170 usually pad upward, but pad short args downward on 171 big-endian machines. */ 172 173#define DEFAULT_FUNCTION_ARG_PADDING(MODE, TYPE) \ 174 (! BYTES_BIG_ENDIAN \ 175 ? upward \ 176 : (((MODE) == BLKmode \ 177 ? ((TYPE) && TREE_CODE (TYPE_SIZE (TYPE)) == INTEGER_CST \ 178 && int_size_in_bytes (TYPE) < (PARM_BOUNDARY / BITS_PER_UNIT)) \ 179 : GET_MODE_BITSIZE (MODE) < PARM_BOUNDARY) \ 180 ? downward : upward)) 181 182#ifndef FUNCTION_ARG_PADDING 183#define FUNCTION_ARG_PADDING(MODE, TYPE) \ 184 DEFAULT_FUNCTION_ARG_PADDING ((MODE), (TYPE)) 185#endif 186 187/* Supply a default definition for FUNCTION_ARG_BOUNDARY. Normally, we let 188 FUNCTION_ARG_PADDING, which also pads the length, handle any needed 189 alignment. */ 190 191#ifndef FUNCTION_ARG_BOUNDARY 192#define FUNCTION_ARG_BOUNDARY(MODE, TYPE) PARM_BOUNDARY 193#endif 194 195/* Supply a default definition of STACK_SAVEAREA_MODE for emit_stack_save. 196 Normally move_insn, so Pmode stack pointer. */ 197 198#ifndef STACK_SAVEAREA_MODE 199#define STACK_SAVEAREA_MODE(LEVEL) Pmode 200#endif 201 202/* Supply a default definition of STACK_SIZE_MODE for 203 allocate_dynamic_stack_space. Normally PLUS/MINUS, so word_mode. */ 204 205#ifndef STACK_SIZE_MODE 206#define STACK_SIZE_MODE word_mode 207#endif 208 209/* Provide default values for the macros controlling stack checking. */ 210 211/* The default is neither full builtin stack checking... */ 212#ifndef STACK_CHECK_BUILTIN 213#define STACK_CHECK_BUILTIN 0 214#endif 215 216/* ...nor static builtin stack checking. */ 217#ifndef STACK_CHECK_STATIC_BUILTIN 218#define STACK_CHECK_STATIC_BUILTIN 0 219#endif 220 221/* The default interval is one page (4096 bytes). */ 222#ifndef STACK_CHECK_PROBE_INTERVAL_EXP 223#define STACK_CHECK_PROBE_INTERVAL_EXP 12 224#endif 225 226/* The default is not to move the stack pointer. */ 227#ifndef STACK_CHECK_MOVING_SP 228#define STACK_CHECK_MOVING_SP 0 229#endif 230 231/* This is a kludge to try to capture the discrepancy between the old 232 mechanism (generic stack checking) and the new mechanism (static 233 builtin stack checking). STACK_CHECK_PROTECT needs to be bumped 234 for the latter because part of the protection area is effectively 235 included in STACK_CHECK_MAX_FRAME_SIZE for the former. */ 236#ifdef STACK_CHECK_PROTECT 237#define STACK_OLD_CHECK_PROTECT STACK_CHECK_PROTECT 238#else 239#define STACK_OLD_CHECK_PROTECT \ 240 (USING_SJLJ_EXCEPTIONS ? 75 * UNITS_PER_WORD : 8 * 1024) 241#endif 242 243/* Minimum amount of stack required to recover from an anticipated stack 244 overflow detection. The default value conveys an estimate of the amount 245 of stack required to propagate an exception. */ 246#ifndef STACK_CHECK_PROTECT 247#define STACK_CHECK_PROTECT \ 248 (USING_SJLJ_EXCEPTIONS ? 75 * UNITS_PER_WORD : 12 * 1024) 249#endif 250 251/* Make the maximum frame size be the largest we can and still only need 252 one probe per function. */ 253#ifndef STACK_CHECK_MAX_FRAME_SIZE 254#define STACK_CHECK_MAX_FRAME_SIZE \ 255 ((1 << STACK_CHECK_PROBE_INTERVAL_EXP) - UNITS_PER_WORD) 256#endif 257 258/* This is arbitrary, but should be large enough everywhere. */ 259#ifndef STACK_CHECK_FIXED_FRAME_SIZE 260#define STACK_CHECK_FIXED_FRAME_SIZE (4 * UNITS_PER_WORD) 261#endif 262 263/* Provide a reasonable default for the maximum size of an object to 264 allocate in the fixed frame. We may need to be able to make this 265 controllable by the user at some point. */ 266#ifndef STACK_CHECK_MAX_VAR_SIZE 267#define STACK_CHECK_MAX_VAR_SIZE (STACK_CHECK_MAX_FRAME_SIZE / 100) 268#endif 269 270/* This structure is used to pass around information about exploded 271 unary, binary and trinary expressions between expand_expr_real_1 and 272 friends. */ 273typedef struct separate_ops 274{ 275 enum tree_code code; 276 tree type; 277 tree op0, op1, op2; 278 location_t location; 279} *sepops; 280 281/* Functions from optabs.c, commonly used, and without need for the optabs 282 tables: */ 283 284/* Passed to expand_simple_binop and expand_binop to say which options 285 to try to use if the requested operation can't be open-coded on the 286 requisite mode. Either OPTAB_LIB or OPTAB_LIB_WIDEN says try using 287 a library call. Either OPTAB_WIDEN or OPTAB_LIB_WIDEN says try 288 using a wider mode. OPTAB_MUST_WIDEN says try widening and don't 289 try anything else. */ 290 291enum optab_methods 292{ 293 OPTAB_DIRECT, 294 OPTAB_LIB, 295 OPTAB_WIDEN, 296 OPTAB_LIB_WIDEN, 297 OPTAB_MUST_WIDEN 298}; 299 300/* Generate code for a simple binary or unary operation. "Simple" in 301 this case means "can be unambiguously described by a (mode, code) 302 pair and mapped to a single optab." */ 303extern rtx expand_simple_binop (enum machine_mode, enum rtx_code, rtx, 304 rtx, rtx, int, enum optab_methods); 305extern rtx expand_simple_unop (enum machine_mode, enum rtx_code, rtx, rtx, 306 int); 307 308/* Report whether the machine description contains an insn which can 309 perform the operation described by CODE and MODE. */ 310extern int have_insn_for (enum rtx_code, enum machine_mode); 311 312extern rtx prepare_operand (int, rtx, int, enum machine_mode, enum machine_mode, 313 int); 314 315/* Emit code to make a call to a constant function or a library call. */ 316extern void emit_libcall_block (rtx, rtx, rtx, rtx); 317 318/* Create but don't emit one rtl instruction to perform certain operations. 319 Modes must match; operands must meet the operation's predicates. 320 Likewise for subtraction and for just copying. */ 321extern rtx gen_add2_insn (rtx, rtx); 322extern rtx gen_add3_insn (rtx, rtx, rtx); 323extern rtx gen_sub2_insn (rtx, rtx); 324extern rtx gen_sub3_insn (rtx, rtx, rtx); 325extern rtx gen_move_insn (rtx, rtx); 326extern int have_add2_insn (rtx, rtx); 327extern int have_sub2_insn (rtx, rtx); 328 329/* Emit a pair of rtl insns to compare two rtx's and to jump 330 to a label if the comparison is true. */ 331extern void emit_cmp_and_jump_insns (rtx, rtx, enum rtx_code, rtx, 332 enum machine_mode, int, rtx); 333 334/* Generate code to indirectly jump to a location given in the rtx LOC. */ 335extern void emit_indirect_jump (rtx); 336 337/* Generate a conditional trap instruction. */ 338extern rtx gen_cond_trap (enum rtx_code, rtx, rtx, rtx); 339 340#include "insn-config.h" 341 342#ifdef HAVE_conditional_move 343/* Emit a conditional move operation. */ 344rtx emit_conditional_move (rtx, enum rtx_code, rtx, rtx, enum machine_mode, 345 rtx, rtx, enum machine_mode, int); 346 347/* Return nonzero if the conditional move is supported. */ 348int can_conditionally_move_p (enum machine_mode mode); 349 350#endif 351rtx emit_conditional_add (rtx, enum rtx_code, rtx, rtx, enum machine_mode, 352 rtx, rtx, enum machine_mode, int); 353 354rtx expand_val_compare_and_swap (rtx, rtx, rtx, rtx); 355rtx expand_bool_compare_and_swap (rtx, rtx, rtx, rtx); 356rtx expand_sync_operation (rtx, rtx, enum rtx_code); 357rtx expand_sync_fetch_operation (rtx, rtx, enum rtx_code, bool, rtx); 358rtx expand_sync_lock_test_and_set (rtx, rtx, rtx); 359 360/* Functions from expmed.c: */ 361 362/* Arguments MODE, RTX: return an rtx for the negation of that value. 363 May emit insns. */ 364extern rtx negate_rtx (enum machine_mode, rtx); 365 366/* Expand a logical AND operation. */ 367extern rtx expand_and (enum machine_mode, rtx, rtx, rtx); 368 369/* Emit a store-flag operation. */ 370extern rtx emit_store_flag (rtx, enum rtx_code, rtx, rtx, enum machine_mode, 371 int, int); 372 373/* Like emit_store_flag, but always succeeds. */ 374extern rtx emit_store_flag_force (rtx, enum rtx_code, rtx, rtx, 375 enum machine_mode, int, int); 376 377/* Functions from builtins.c: */ 378extern rtx expand_builtin (tree, rtx, rtx, enum machine_mode, int); 379extern tree std_build_builtin_va_list (void); 380extern tree std_fn_abi_va_list (tree); 381extern tree std_canonical_va_list_type (tree); 382 383extern void std_expand_builtin_va_start (tree, rtx); 384extern rtx default_expand_builtin (tree, rtx, rtx, enum machine_mode, int); 385extern void expand_builtin_setjmp_setup (rtx, rtx); 386extern void expand_builtin_setjmp_receiver (rtx); 387extern rtx expand_builtin_saveregs (void); 388extern void expand_builtin_trap (void); 389extern rtx builtin_strncpy_read_str (void *, HOST_WIDE_INT, enum machine_mode); 390 391/* Functions from expr.c: */ 392 393/* This is run during target initialization to set up which modes can be 394 used directly in memory and to initialize the block move optab. */ 395extern void init_expr_target (void); 396 397/* This is run at the start of compiling a function. */ 398extern void init_expr (void); 399 400/* Emit some rtl insns to move data between rtx's, converting machine modes. 401 Both modes must be floating or both fixed. */ 402extern void convert_move (rtx, rtx, int); 403 404/* Convert an rtx to specified machine mode and return the result. */ 405extern rtx convert_to_mode (enum machine_mode, rtx, int); 406 407/* Convert an rtx to MODE from OLDMODE and return the result. */ 408extern rtx convert_modes (enum machine_mode, enum machine_mode, rtx, int); 409 410/* Emit code to move a block Y to a block X. */ 411 412enum block_op_methods 413{ 414 BLOCK_OP_NORMAL, 415 BLOCK_OP_NO_LIBCALL, 416 BLOCK_OP_CALL_PARM, 417 /* Like BLOCK_OP_NORMAL, but the libcall can be tail call optimized. */ 418 BLOCK_OP_TAILCALL 419}; 420 421extern GTY(()) tree block_clear_fn; 422extern void init_block_move_fn (const char *); 423extern void init_block_clear_fn (const char *); 424 425extern rtx emit_block_move (rtx, rtx, rtx, enum block_op_methods); 426extern rtx emit_block_move_via_libcall (rtx, rtx, rtx, bool); 427extern rtx emit_block_move_hints (rtx, rtx, rtx, enum block_op_methods, 428 unsigned int, HOST_WIDE_INT); 429extern bool emit_storent_insn (rtx to, rtx from); 430 431/* Copy all or part of a value X into registers starting at REGNO. 432 The number of registers to be filled is NREGS. */ 433extern void move_block_to_reg (int, rtx, int, enum machine_mode); 434 435/* Copy all or part of a BLKmode value X out of registers starting at REGNO. 436 The number of registers to be filled is NREGS. */ 437extern void move_block_from_reg (int, rtx, int); 438 439/* Generate a non-consecutive group of registers represented by a PARALLEL. */ 440extern rtx gen_group_rtx (rtx); 441 442/* Load a BLKmode value into non-consecutive registers represented by a 443 PARALLEL. */ 444extern void emit_group_load (rtx, rtx, tree, int); 445 446/* Similarly, but load into new temporaries. */ 447extern rtx emit_group_load_into_temps (rtx, rtx, tree, int); 448 449/* Move a non-consecutive group of registers represented by a PARALLEL into 450 a non-consecutive group of registers represented by a PARALLEL. */ 451extern void emit_group_move (rtx, rtx); 452 453/* Move a group of registers represented by a PARALLEL into pseudos. */ 454extern rtx emit_group_move_into_temps (rtx); 455 456/* Store a BLKmode value from non-consecutive registers represented by a 457 PARALLEL. */ 458extern void emit_group_store (rtx, rtx, tree, int); 459 460/* Copy BLKmode object from a set of registers. */ 461extern rtx copy_blkmode_from_reg (rtx, rtx, tree); 462 463/* Mark REG as holding a parameter for the next CALL_INSN. */ 464extern void use_reg (rtx *, rtx); 465 466/* Mark NREGS consecutive regs, starting at REGNO, as holding parameters 467 for the next CALL_INSN. */ 468extern void use_regs (rtx *, int, int); 469 470/* Mark a PARALLEL as holding a parameter for the next CALL_INSN. */ 471extern void use_group_regs (rtx *, rtx); 472 473/* Write zeros through the storage of OBJECT. 474 If OBJECT has BLKmode, SIZE is its length in bytes. */ 475extern rtx clear_storage (rtx, rtx, enum block_op_methods); 476extern rtx clear_storage_hints (rtx, rtx, enum block_op_methods, 477 unsigned int, HOST_WIDE_INT); 478/* The same, but always output an library call. */ 479rtx set_storage_via_libcall (rtx, rtx, rtx, bool); 480 481/* Expand a setmem pattern; return true if successful. */ 482extern bool set_storage_via_setmem (rtx, rtx, rtx, unsigned int, 483 unsigned int, HOST_WIDE_INT); 484 485/* Determine whether the LEN bytes can be moved by using several move 486 instructions. Return nonzero if a call to move_by_pieces should 487 succeed. */ 488extern int can_move_by_pieces (unsigned HOST_WIDE_INT, unsigned int); 489 490/* Return nonzero if it is desirable to store LEN bytes generated by 491 CONSTFUN with several move instructions by store_by_pieces 492 function. CONSTFUNDATA is a pointer which will be passed as argument 493 in every CONSTFUN call. 494 ALIGN is maximum alignment we can assume. 495 MEMSETP is true if this is a real memset/bzero, not a copy 496 of a const string. */ 497extern int can_store_by_pieces (unsigned HOST_WIDE_INT, 498 rtx (*) (void *, HOST_WIDE_INT, 499 enum machine_mode), 500 void *, unsigned int, bool); 501 502/* Generate several move instructions to store LEN bytes generated by 503 CONSTFUN to block TO. (A MEM rtx with BLKmode). CONSTFUNDATA is a 504 pointer which will be passed as argument in every CONSTFUN call. 505 ALIGN is maximum alignment we can assume. 506 MEMSETP is true if this is a real memset/bzero, not a copy. 507 Returns TO + LEN. */ 508extern rtx store_by_pieces (rtx, unsigned HOST_WIDE_INT, 509 rtx (*) (void *, HOST_WIDE_INT, enum machine_mode), 510 void *, unsigned int, bool, int); 511 512/* Emit insns to set X from Y. */ 513extern rtx emit_move_insn (rtx, rtx); 514 515/* Emit insns to set X from Y, with no frills. */ 516extern rtx emit_move_insn_1 (rtx, rtx); 517 518extern rtx emit_move_complex_push (enum machine_mode, rtx, rtx); 519extern rtx emit_move_complex_parts (rtx, rtx); 520 521/* Push a block of length SIZE (perhaps variable) 522 and return an rtx to address the beginning of the block. */ 523extern rtx push_block (rtx, int, int); 524 525/* Generate code to push something onto the stack, given its mode and type. */ 526extern void emit_push_insn (rtx, enum machine_mode, tree, rtx, unsigned int, 527 int, rtx, int, rtx, rtx, int, rtx); 528 529/* Expand an assignment that stores the value of FROM into TO. */ 530extern void expand_assignment (tree, tree, bool); 531 532/* Generate code for computing expression EXP, 533 and storing the value into TARGET. 534 If SUGGEST_REG is nonzero, copy the value through a register 535 and return that register, if that is possible. */ 536extern rtx store_expr (tree, rtx, int, bool); 537 538/* Given an rtx that may include add and multiply operations, 539 generate them as insns and return a pseudo-reg containing the value. 540 Useful after calling expand_expr with 1 as sum_ok. */ 541extern rtx force_operand (rtx, rtx); 542 543/* Work horses for expand_expr. */ 544extern rtx expand_expr_real (tree, rtx, enum machine_mode, 545 enum expand_modifier, rtx *); 546extern rtx expand_expr_real_1 (tree, rtx, enum machine_mode, 547 enum expand_modifier, rtx *); 548extern rtx expand_expr_real_2 (sepops, rtx, enum machine_mode, 549 enum expand_modifier); 550 551/* Generate code for computing expression EXP. 552 An rtx for the computed value is returned. The value is never null. 553 In the case of a void EXP, const0_rtx is returned. */ 554static inline rtx 555expand_expr (tree exp, rtx target, enum machine_mode mode, 556 enum expand_modifier modifier) 557{ 558 return expand_expr_real (exp, target, mode, modifier, NULL); 559} 560 561static inline rtx 562expand_normal (tree exp) 563{ 564 return expand_expr_real (exp, NULL_RTX, VOIDmode, EXPAND_NORMAL, NULL); 565} 566 567/* At the start of a function, record that we have no previously-pushed 568 arguments waiting to be popped. */ 569extern void init_pending_stack_adjust (void); 570 571/* Discard any pending stack adjustment. */ 572extern void discard_pending_stack_adjust (void); 573 574/* When exiting from function, if safe, clear out any pending stack adjust 575 so the adjustment won't get done. */ 576extern void clear_pending_stack_adjust (void); 577 578/* Pop any previously-pushed arguments that have not been popped yet. */ 579extern void do_pending_stack_adjust (void); 580 581/* Return the tree node and offset if a given argument corresponds to 582 a string constant. */ 583extern tree string_constant (tree, tree *); 584 585/* Generate code to evaluate EXP and jump to LABEL if the value is zero. */ 586extern void jumpifnot (tree, rtx, int); 587extern void jumpifnot_1 (enum tree_code, tree, tree, rtx, int); 588 589/* Generate code to evaluate EXP and jump to LABEL if the value is nonzero. */ 590extern void jumpif (tree, rtx, int); 591extern void jumpif_1 (enum tree_code, tree, tree, rtx, int); 592 593/* Generate code to evaluate EXP and jump to IF_FALSE_LABEL if 594 the result is zero, or IF_TRUE_LABEL if the result is one. */ 595extern void do_jump (tree, rtx, rtx, int); 596extern void do_jump_1 (enum tree_code, tree, tree, rtx, rtx, int); 597 598extern void do_compare_rtx_and_jump (rtx, rtx, enum rtx_code, int, 599 enum machine_mode, rtx, rtx, rtx, int); 600 601/* Two different ways of generating switch statements. */ 602extern int try_casesi (tree, tree, tree, tree, rtx, rtx, rtx); 603extern int try_tablejump (tree, tree, tree, tree, rtx, rtx); 604 605/* Functions from alias.c */ 606#include "alias.h" 607 608 609/* rtl.h and tree.h were included. */ 610/* Return an rtx for the size in bytes of the value of an expr. */ 611extern rtx expr_size (tree); 612 613/* Return a wide integer for the size in bytes of the value of EXP, or -1 614 if the size can vary or is larger than an integer. */ 615extern HOST_WIDE_INT int_expr_size (tree); 616 617/* Return an rtx that refers to the value returned by a function 618 in its original home. This becomes invalid if any more code is emitted. */ 619extern rtx hard_function_value (const_tree, const_tree, const_tree, int); 620 621extern rtx prepare_call_address (tree, rtx, rtx, rtx *, int, int); 622 623extern bool shift_return_value (enum machine_mode, bool, rtx); 624 625extern rtx expand_call (tree, rtx, int); 626 627extern void fixup_tail_calls (void); 628 629#ifdef TREE_CODE 630extern rtx expand_shift (enum tree_code, enum machine_mode, rtx, tree, rtx, 631 int); 632extern rtx expand_divmod (int, enum tree_code, enum machine_mode, rtx, rtx, 633 rtx, int); 634#endif 635 636extern void locate_and_pad_parm (enum machine_mode, tree, int, int, tree, 637 struct args_size *, 638 struct locate_and_pad_arg_data *); 639 640/* Return the CODE_LABEL rtx for a LABEL_DECL, creating it if necessary. */ 641extern rtx label_rtx (tree); 642 643/* As label_rtx, but additionally the label is placed on the forced label 644 list of its containing function (i.e. it is treated as reachable even 645 if how is not obvious). */ 646extern rtx force_label_rtx (tree); 647 648/* Return an rtx like arg but sans any constant terms. 649 Returns the original rtx if it has no constant terms. 650 The constant terms are added and stored via a second arg. */ 651extern rtx eliminate_constant_term (rtx, rtx *); 652 653/* Convert arg to a valid memory address for specified machine mode that points 654 to a specific named address space, by emitting insns to perform arithmetic 655 if necessary. */ 656extern rtx memory_address_addr_space (enum machine_mode, rtx, addr_space_t); 657 658/* Like memory_address_addr_space, except assume the memory address points to 659 the generic named address space. */ 660#define memory_address(MODE,RTX) \ 661 memory_address_addr_space ((MODE), (RTX), ADDR_SPACE_GENERIC) 662 663/* Return a memory reference like MEMREF, but with its mode changed 664 to MODE and its address changed to ADDR. 665 (VOIDmode means don't change the mode. 666 NULL for ADDR means don't change the address.) */ 667extern rtx change_address (rtx, enum machine_mode, rtx); 668 669/* Return a memory reference like MEMREF, but with its mode changed 670 to MODE and its address offset by OFFSET bytes. */ 671#define adjust_address(MEMREF, MODE, OFFSET) \ 672 adjust_address_1 (MEMREF, MODE, OFFSET, 1, 1) 673 674/* Likewise, but the reference is not required to be valid. */ 675#define adjust_address_nv(MEMREF, MODE, OFFSET) \ 676 adjust_address_1 (MEMREF, MODE, OFFSET, 0, 1) 677 678/* Return a memory reference like MEMREF, but with its mode changed 679 to MODE and its address changed to ADDR, which is assumed to be 680 increased by OFFSET bytes from MEMREF. */ 681#define adjust_automodify_address(MEMREF, MODE, ADDR, OFFSET) \ 682 adjust_automodify_address_1 (MEMREF, MODE, ADDR, OFFSET, 1) 683 684/* Likewise, but the reference is not required to be valid. */ 685#define adjust_automodify_address_nv(MEMREF, MODE, ADDR, OFFSET) \ 686 adjust_automodify_address_1 (MEMREF, MODE, ADDR, OFFSET, 0) 687 688extern rtx adjust_address_1 (rtx, enum machine_mode, HOST_WIDE_INT, int, int); 689extern rtx adjust_automodify_address_1 (rtx, enum machine_mode, rtx, 690 HOST_WIDE_INT, int); 691 692/* Return a memory reference like MEMREF, but whose address is changed by 693 adding OFFSET, an RTX, to it. POW2 is the highest power of two factor 694 known to be in OFFSET (possibly 1). */ 695extern rtx offset_address (rtx, rtx, unsigned HOST_WIDE_INT); 696 697/* Definitions from emit-rtl.c */ 698#include "emit-rtl.h" 699 700/* Return a memory reference like MEMREF, but with its mode widened to 701 MODE and adjusted by OFFSET. */ 702extern rtx widen_memory_access (rtx, enum machine_mode, HOST_WIDE_INT); 703 704/* Return a memory reference like MEMREF, but which is known to have a 705 valid address. */ 706extern rtx validize_mem (rtx); 707 708extern rtx use_anchored_address (rtx); 709 710/* Given REF, a MEM, and T, either the type of X or the expression 711 corresponding to REF, set the memory attributes. OBJECTP is nonzero 712 if we are making a new object of this type. */ 713extern void set_mem_attributes (rtx, tree, int); 714 715/* Similar, except that BITPOS has not yet been applied to REF, so if 716 we alter MEM_OFFSET according to T then we should subtract BITPOS 717 expecting that it'll be added back in later. */ 718extern void set_mem_attributes_minus_bitpos (rtx, tree, int, HOST_WIDE_INT); 719 720/* Return OFFSET if XEXP (MEM, 0) - OFFSET is known to be ALIGN 721 bits aligned for 0 <= OFFSET < ALIGN / BITS_PER_UNIT, or 722 -1 if not known. */ 723extern int get_mem_align_offset (rtx, unsigned int); 724 725/* Assemble the static constant template for function entry trampolines. */ 726extern rtx assemble_trampoline_template (void); 727 728/* Copy given rtx to a new temp reg and return that. */ 729extern rtx copy_to_reg (rtx); 730 731/* Like copy_to_reg but always make the reg Pmode. */ 732extern rtx copy_addr_to_reg (rtx); 733 734/* Like copy_to_reg but always make the reg the specified mode MODE. */ 735extern rtx copy_to_mode_reg (enum machine_mode, rtx); 736 737/* Copy given rtx to given temp reg and return that. */ 738extern rtx copy_to_suggested_reg (rtx, rtx, enum machine_mode); 739 740/* Copy a value to a register if it isn't already a register. 741 Args are mode (in case value is a constant) and the value. */ 742extern rtx force_reg (enum machine_mode, rtx); 743 744/* Return given rtx, copied into a new temp reg if it was in memory. */ 745extern rtx force_not_mem (rtx); 746 747/* Return mode and signedness to use when an argument or result in the 748 given mode is promoted. */ 749extern enum machine_mode promote_function_mode (const_tree, enum machine_mode, int *, 750 const_tree, int); 751 752/* Return mode and signedness to use when an object in the given mode 753 is promoted. */ 754extern enum machine_mode promote_mode (const_tree, enum machine_mode, int *); 755 756/* Return mode and signedness to use when object is promoted. */ 757enum machine_mode promote_decl_mode (const_tree, int *); 758 759/* Remove some bytes from the stack. An rtx says how many. */ 760extern void adjust_stack (rtx); 761 762/* Add some bytes to the stack. An rtx says how many. */ 763extern void anti_adjust_stack (rtx); 764 765/* Add some bytes to the stack while probing it. An rtx says how many. */ 766extern void anti_adjust_stack_and_probe (rtx, bool); 767 768/* This enum is used for the following two functions. */ 769enum save_level {SAVE_BLOCK, SAVE_FUNCTION, SAVE_NONLOCAL}; 770 771/* Save the stack pointer at the specified level. */ 772extern void emit_stack_save (enum save_level, rtx *, rtx); 773 774/* Restore the stack pointer from a save area of the specified level. */ 775extern void emit_stack_restore (enum save_level, rtx, rtx); 776 777/* Invoke emit_stack_save for the nonlocal_goto_save_area. */ 778extern void update_nonlocal_goto_save_area (void); 779 780/* Allocate some space on the stack dynamically and return its address. An rtx 781 says how many bytes. */ 782extern rtx allocate_dynamic_stack_space (rtx, rtx, int); 783 784/* Probe a range of stack addresses from FIRST to FIRST+SIZE, inclusive. 785 FIRST is a constant and size is a Pmode RTX. These are offsets from 786 the current stack pointer. STACK_GROWS_DOWNWARD says whether to add 787 or subtract them from the stack pointer. */ 788extern void probe_stack_range (HOST_WIDE_INT, rtx); 789 790/* Return an rtx that refers to the value returned by a library call 791 in its original home. This becomes invalid if any more code is emitted. */ 792extern rtx hard_libcall_value (enum machine_mode, rtx); 793 794/* Return the mode desired by operand N of a particular bitfield 795 insert/extract insn, or MAX_MACHINE_MODE if no such insn is 796 available. */ 797 798enum extraction_pattern { EP_insv, EP_extv, EP_extzv }; 799extern enum machine_mode 800mode_for_extraction (enum extraction_pattern, int); 801 802extern void store_bit_field (rtx, unsigned HOST_WIDE_INT, 803 unsigned HOST_WIDE_INT, enum machine_mode, rtx); 804extern rtx extract_bit_field (rtx, unsigned HOST_WIDE_INT, 805 unsigned HOST_WIDE_INT, int, rtx, 806 enum machine_mode, enum machine_mode); 807extern rtx extract_low_bits (enum machine_mode, enum machine_mode, rtx); 808extern rtx expand_mult (enum machine_mode, rtx, rtx, rtx, int); 809extern rtx expand_mult_highpart_adjust (enum machine_mode, rtx, rtx, rtx, rtx, int); 810 811extern rtx assemble_static_space (unsigned HOST_WIDE_INT); 812extern int safe_from_p (const_rtx, tree, int); 813extern bool split_comparison (enum rtx_code, enum machine_mode, 814 enum rtx_code *, enum rtx_code *); 815 816/* Call this once to initialize the contents of the optabs 817 appropriately for the current target machine. */ 818extern void init_optabs (void); 819extern void init_all_optabs (void); 820 821/* Call this to initialize an optab function entry. */ 822extern rtx init_one_libfunc (const char *); 823extern rtx set_user_assembler_libfunc (const char *, const char *); 824 825/* Build a decl for a libfunc named NAME. */ 826extern tree build_libfunc_function (const char *); 827 828/* Get the personality libfunc for a function decl. */ 829rtx get_personality_function (tree); 830 831extern int vector_mode_valid_p (enum machine_mode); 832 833#endif /* GCC_EXPR_H */ 834