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annotate gcc/expr.h @ 158:494b0b89df80 default tip
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| author | Shinji KONO <kono@ie.u-ryukyu.ac.jp> |
|---|---|
| date | Mon, 25 May 2020 18:13:55 +0900 |
| parents | 1830386684a0 |
| children |
| rev | line source |
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| 0 | 1 /* Definitions for code generation pass of GNU compiler. |
| 145 | 2 Copyright (C) 1987-2020 Free Software Foundation, Inc. |
| 0 | 3 |
| 4 This file is part of GCC. | |
| 5 | |
| 6 GCC is free software; you can redistribute it and/or modify it under | |
| 7 the terms of the GNU General Public License as published by the Free | |
| 8 Software Foundation; either version 3, or (at your option) any later | |
| 9 version. | |
| 10 | |
| 11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY | |
| 12 WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 14 for more details. | |
| 15 | |
| 16 You should have received a copy of the GNU General Public License | |
| 17 along with GCC; see the file COPYING3. If not see | |
| 18 <http://www.gnu.org/licenses/>. */ | |
| 19 | |
| 20 #ifndef GCC_EXPR_H | |
| 21 #define GCC_EXPR_H | |
| 22 | |
| 23 /* This is the 4th arg to `expand_expr'. | |
| 24 EXPAND_STACK_PARM means we are possibly expanding a call param onto | |
| 25 the stack. | |
| 26 EXPAND_SUM means it is ok to return a PLUS rtx or MULT rtx. | |
| 27 EXPAND_INITIALIZER is similar but also record any labels on forced_labels. | |
| 28 EXPAND_CONST_ADDRESS means it is ok to return a MEM whose address | |
| 29 is a constant that is not a legitimate address. | |
| 30 EXPAND_WRITE means we are only going to write to the resulting rtx. | |
| 31 EXPAND_MEMORY means we are interested in a memory result, even if | |
| 111 | 32 the memory is constant and we could have propagated a constant value, |
| 33 or the memory is unaligned on a STRICT_ALIGNMENT target. */ | |
| 0 | 34 enum expand_modifier {EXPAND_NORMAL = 0, EXPAND_STACK_PARM, EXPAND_SUM, |
| 35 EXPAND_CONST_ADDRESS, EXPAND_INITIALIZER, EXPAND_WRITE, | |
| 36 EXPAND_MEMORY}; | |
| 37 | |
| 38 /* Prevent the compiler from deferring stack pops. See | |
| 39 inhibit_defer_pop for more information. */ | |
| 40 #define NO_DEFER_POP (inhibit_defer_pop += 1) | |
| 41 | |
| 42 /* Allow the compiler to defer stack pops. See inhibit_defer_pop for | |
| 43 more information. */ | |
| 44 #define OK_DEFER_POP (inhibit_defer_pop -= 1) | |
| 45 | |
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46 /* This structure is used to pass around information about exploded |
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47 unary, binary and trinary expressions between expand_expr_real_1 and |
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48 friends. */ |
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49 typedef struct separate_ops |
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50 { |
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51 enum tree_code code; |
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52 location_t location; |
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53 tree type; |
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54 tree op0, op1, op2; |
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55 } *sepops; |
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56 |
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57 /* This is run during target initialization to set up which modes can be |
| 0 | 58 used directly in memory and to initialize the block move optab. */ |
| 59 extern void init_expr_target (void); | |
| 60 | |
| 61 /* This is run at the start of compiling a function. */ | |
| 62 extern void init_expr (void); | |
| 63 | |
| 64 /* Emit some rtl insns to move data between rtx's, converting machine modes. | |
| 65 Both modes must be floating or both fixed. */ | |
| 66 extern void convert_move (rtx, rtx, int); | |
| 67 | |
| 68 /* Convert an rtx to specified machine mode and return the result. */ | |
| 111 | 69 extern rtx convert_to_mode (machine_mode, rtx, int); |
| 0 | 70 |
| 71 /* Convert an rtx to MODE from OLDMODE and return the result. */ | |
| 111 | 72 extern rtx convert_modes (machine_mode, machine_mode, rtx, int); |
| 73 | |
| 74 /* Expand a call to memcpy or memmove or memcmp, and return the result. */ | |
| 75 extern rtx emit_block_op_via_libcall (enum built_in_function, rtx, rtx, rtx, | |
| 76 bool); | |
| 77 | |
| 78 static inline rtx | |
| 79 emit_block_copy_via_libcall (rtx dst, rtx src, rtx size, bool tailcall = false) | |
| 80 { | |
| 81 return emit_block_op_via_libcall (BUILT_IN_MEMCPY, dst, src, size, tailcall); | |
| 82 } | |
| 83 | |
| 84 static inline rtx | |
| 85 emit_block_move_via_libcall (rtx dst, rtx src, rtx size, bool tailcall = false) | |
| 86 { | |
| 87 return emit_block_op_via_libcall (BUILT_IN_MEMMOVE, dst, src, size, tailcall); | |
| 88 } | |
| 89 | |
| 90 static inline rtx | |
| 91 emit_block_comp_via_libcall (rtx dst, rtx src, rtx size, bool tailcall = false) | |
| 92 { | |
| 93 return emit_block_op_via_libcall (BUILT_IN_MEMCMP, dst, src, size, tailcall); | |
| 94 } | |
| 0 | 95 |
| 96 /* Emit code to move a block Y to a block X. */ | |
| 97 enum block_op_methods | |
| 98 { | |
| 99 BLOCK_OP_NORMAL, | |
| 100 BLOCK_OP_NO_LIBCALL, | |
| 101 BLOCK_OP_CALL_PARM, | |
| 102 /* Like BLOCK_OP_NORMAL, but the libcall can be tail call optimized. */ | |
| 131 | 103 BLOCK_OP_TAILCALL, |
| 104 /* Like BLOCK_OP_NO_LIBCALL, but instead of emitting a libcall return | |
| 105 pc_rtx to indicate nothing has been emitted and let the caller handle | |
| 106 it. */ | |
| 107 BLOCK_OP_NO_LIBCALL_RET | |
| 0 | 108 }; |
| 109 | |
| 111 | 110 typedef rtx (*by_pieces_constfn) (void *, HOST_WIDE_INT, scalar_int_mode); |
| 0 | 111 |
| 112 extern rtx emit_block_move (rtx, rtx, rtx, enum block_op_methods); | |
| 113 extern rtx emit_block_move_hints (rtx, rtx, rtx, enum block_op_methods, | |
| 111 | 114 unsigned int, HOST_WIDE_INT, |
| 115 unsigned HOST_WIDE_INT, | |
| 116 unsigned HOST_WIDE_INT, | |
| 145 | 117 unsigned HOST_WIDE_INT, |
| 118 bool bail_out_libcall = false, | |
| 119 bool *is_move_done = NULL, | |
| 120 bool might_overlap = false); | |
| 111 | 121 extern rtx emit_block_cmp_hints (rtx, rtx, rtx, tree, rtx, bool, |
| 122 by_pieces_constfn, void *); | |
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123 extern bool emit_storent_insn (rtx to, rtx from); |
| 0 | 124 |
| 125 /* Copy all or part of a value X into registers starting at REGNO. | |
| 126 The number of registers to be filled is NREGS. */ | |
| 111 | 127 extern void move_block_to_reg (int, rtx, int, machine_mode); |
| 0 | 128 |
| 129 /* Copy all or part of a BLKmode value X out of registers starting at REGNO. | |
| 130 The number of registers to be filled is NREGS. */ | |
| 131 extern void move_block_from_reg (int, rtx, int); | |
| 132 | |
| 133 /* Generate a non-consecutive group of registers represented by a PARALLEL. */ | |
| 134 extern rtx gen_group_rtx (rtx); | |
| 135 | |
| 136 /* Load a BLKmode value into non-consecutive registers represented by a | |
| 137 PARALLEL. */ | |
| 131 | 138 extern void emit_group_load (rtx, rtx, tree, poly_int64); |
| 0 | 139 |
| 140 /* Similarly, but load into new temporaries. */ | |
| 131 | 141 extern rtx emit_group_load_into_temps (rtx, rtx, tree, poly_int64); |
| 0 | 142 |
| 143 /* Move a non-consecutive group of registers represented by a PARALLEL into | |
| 144 a non-consecutive group of registers represented by a PARALLEL. */ | |
| 145 extern void emit_group_move (rtx, rtx); | |
| 146 | |
| 147 /* Move a group of registers represented by a PARALLEL into pseudos. */ | |
| 148 extern rtx emit_group_move_into_temps (rtx); | |
| 149 | |
| 150 /* Store a BLKmode value from non-consecutive registers represented by a | |
| 151 PARALLEL. */ | |
| 131 | 152 extern void emit_group_store (rtx, rtx, tree, poly_int64); |
| 0 | 153 |
| 111 | 154 extern rtx maybe_emit_group_store (rtx, tree); |
| 155 | |
| 156 /* Mark REG as holding a parameter for the next CALL_INSN. | |
| 157 Mode is TYPE_MODE of the non-promoted parameter, or VOIDmode. */ | |
| 158 extern void use_reg_mode (rtx *, rtx, machine_mode); | |
| 159 extern void clobber_reg_mode (rtx *, rtx, machine_mode); | |
| 160 | |
| 161 extern rtx copy_blkmode_to_reg (machine_mode, tree); | |
| 0 | 162 |
| 163 /* Mark REG as holding a parameter for the next CALL_INSN. */ | |
| 111 | 164 static inline void |
| 165 use_reg (rtx *fusage, rtx reg) | |
| 166 { | |
| 167 use_reg_mode (fusage, reg, VOIDmode); | |
| 168 } | |
| 169 | |
| 170 /* Mark REG as clobbered by the call with FUSAGE as CALL_INSN_FUNCTION_USAGE. */ | |
| 171 static inline void | |
| 172 clobber_reg (rtx *fusage, rtx reg) | |
| 173 { | |
| 174 clobber_reg_mode (fusage, reg, VOIDmode); | |
| 175 } | |
| 0 | 176 |
| 177 /* Mark NREGS consecutive regs, starting at REGNO, as holding parameters | |
| 178 for the next CALL_INSN. */ | |
| 179 extern void use_regs (rtx *, int, int); | |
| 180 | |
| 181 /* Mark a PARALLEL as holding a parameter for the next CALL_INSN. */ | |
| 182 extern void use_group_regs (rtx *, rtx); | |
| 183 | |
| 111 | 184 #ifdef GCC_INSN_CODES_H |
| 185 extern rtx expand_cmpstrn_or_cmpmem (insn_code, rtx, rtx, rtx, tree, rtx, | |
| 186 HOST_WIDE_INT); | |
| 187 #endif | |
| 188 | |
| 0 | 189 /* Write zeros through the storage of OBJECT. |
| 190 If OBJECT has BLKmode, SIZE is its length in bytes. */ | |
| 191 extern rtx clear_storage (rtx, rtx, enum block_op_methods); | |
| 192 extern rtx clear_storage_hints (rtx, rtx, enum block_op_methods, | |
| 111 | 193 unsigned int, HOST_WIDE_INT, |
| 194 unsigned HOST_WIDE_INT, | |
| 195 unsigned HOST_WIDE_INT, | |
| 196 unsigned HOST_WIDE_INT); | |
| 0 | 197 /* The same, but always output an library call. */ |
| 111 | 198 extern rtx set_storage_via_libcall (rtx, rtx, rtx, bool = false); |
| 0 | 199 |
| 200 /* Expand a setmem pattern; return true if successful. */ | |
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201 extern bool set_storage_via_setmem (rtx, rtx, rtx, unsigned int, |
| 111 | 202 unsigned int, HOST_WIDE_INT, |
| 203 unsigned HOST_WIDE_INT, | |
| 204 unsigned HOST_WIDE_INT, | |
| 205 unsigned HOST_WIDE_INT); | |
| 0 | 206 |
| 207 /* Return nonzero if it is desirable to store LEN bytes generated by | |
| 208 CONSTFUN with several move instructions by store_by_pieces | |
| 209 function. CONSTFUNDATA is a pointer which will be passed as argument | |
| 210 in every CONSTFUN call. | |
| 211 ALIGN is maximum alignment we can assume. | |
| 212 MEMSETP is true if this is a real memset/bzero, not a copy | |
| 213 of a const string. */ | |
| 214 extern int can_store_by_pieces (unsigned HOST_WIDE_INT, | |
| 111 | 215 by_pieces_constfn, |
| 0 | 216 void *, unsigned int, bool); |
| 217 | |
| 218 /* Generate several move instructions to store LEN bytes generated by | |
| 219 CONSTFUN to block TO. (A MEM rtx with BLKmode). CONSTFUNDATA is a | |
| 220 pointer which will be passed as argument in every CONSTFUN call. | |
| 221 ALIGN is maximum alignment we can assume. | |
| 222 MEMSETP is true if this is a real memset/bzero, not a copy. | |
| 223 Returns TO + LEN. */ | |
| 111 | 224 extern rtx store_by_pieces (rtx, unsigned HOST_WIDE_INT, by_pieces_constfn, |
| 145 | 225 void *, unsigned int, bool, memop_ret); |
| 0 | 226 |
| 227 /* Emit insns to set X from Y. */ | |
| 111 | 228 extern rtx_insn *emit_move_insn (rtx, rtx); |
| 229 extern rtx_insn *gen_move_insn (rtx, rtx); | |
| 0 | 230 |
| 231 /* Emit insns to set X from Y, with no frills. */ | |
| 111 | 232 extern rtx_insn *emit_move_insn_1 (rtx, rtx); |
| 0 | 233 |
| 111 | 234 extern rtx_insn *emit_move_complex_push (machine_mode, rtx, rtx); |
| 235 extern rtx_insn *emit_move_complex_parts (rtx, rtx); | |
| 236 extern rtx read_complex_part (rtx, bool); | |
| 237 extern void write_complex_part (rtx, rtx, bool); | |
| 238 extern rtx read_complex_part (rtx, bool); | |
| 239 extern rtx emit_move_resolve_push (machine_mode, rtx); | |
| 0 | 240 |
| 241 /* Push a block of length SIZE (perhaps variable) | |
| 242 and return an rtx to address the beginning of the block. */ | |
| 131 | 243 extern rtx push_block (rtx, poly_int64, int); |
| 0 | 244 |
| 245 /* Generate code to push something onto the stack, given its mode and type. */ | |
| 111 | 246 extern bool emit_push_insn (rtx, machine_mode, tree, rtx, unsigned int, |
| 131 | 247 int, rtx, poly_int64, rtx, rtx, int, rtx, bool); |
| 111 | 248 |
| 249 /* Extract the accessible bit-range from a COMPONENT_REF. */ | |
| 131 | 250 extern void get_bit_range (poly_uint64_pod *, poly_uint64_pod *, tree, |
| 251 poly_int64_pod *, tree *); | |
| 0 | 252 |
| 253 /* Expand an assignment that stores the value of FROM into TO. */ | |
| 254 extern void expand_assignment (tree, tree, bool); | |
| 255 | |
| 256 /* Generate code for computing expression EXP, | |
| 257 and storing the value into TARGET. | |
| 258 If SUGGEST_REG is nonzero, copy the value through a register | |
| 259 and return that register, if that is possible. */ | |
| 111 | 260 extern rtx store_expr (tree, rtx, int, bool, bool); |
| 0 | 261 |
| 262 /* Given an rtx that may include add and multiply operations, | |
| 263 generate them as insns and return a pseudo-reg containing the value. | |
| 264 Useful after calling expand_expr with 1 as sum_ok. */ | |
| 265 extern rtx force_operand (rtx, rtx); | |
| 266 | |
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267 /* Work horses for expand_expr. */ |
| 111 | 268 extern rtx expand_expr_real (tree, rtx, machine_mode, |
| 269 enum expand_modifier, rtx *, bool); | |
| 270 extern rtx expand_expr_real_1 (tree, rtx, machine_mode, | |
| 271 enum expand_modifier, rtx *, bool); | |
| 272 extern rtx expand_expr_real_2 (sepops, rtx, machine_mode, | |
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273 enum expand_modifier); |
| 0 | 274 |
| 275 /* Generate code for computing expression EXP. | |
| 276 An rtx for the computed value is returned. The value is never null. | |
| 277 In the case of a void EXP, const0_rtx is returned. */ | |
| 278 static inline rtx | |
| 111 | 279 expand_expr (tree exp, rtx target, machine_mode mode, |
| 0 | 280 enum expand_modifier modifier) |
| 281 { | |
| 111 | 282 return expand_expr_real (exp, target, mode, modifier, NULL, false); |
| 0 | 283 } |
| 284 | |
| 285 static inline rtx | |
| 286 expand_normal (tree exp) | |
| 287 { | |
| 111 | 288 return expand_expr_real (exp, NULL_RTX, VOIDmode, EXPAND_NORMAL, NULL, false); |
| 0 | 289 } |
| 290 | |
| 291 | |
| 292 /* Return the tree node and offset if a given argument corresponds to | |
| 293 a string constant. */ | |
| 131 | 294 extern tree string_constant (tree, tree *, tree *, tree *); |
| 295 | |
| 296 extern enum tree_code maybe_optimize_mod_cmp (enum tree_code, tree *, tree *); | |
| 0 | 297 |
| 111 | 298 /* Two different ways of generating switch statements. */ |
| 299 extern int try_casesi (tree, tree, tree, tree, rtx, rtx, rtx, profile_probability); | |
| 300 extern int try_tablejump (tree, tree, tree, tree, rtx, rtx, profile_probability); | |
| 0 | 301 |
| 111 | 302 extern int safe_from_p (const_rtx, tree, int); |
| 303 | |
| 304 /* Get the personality libfunc for a function decl. */ | |
| 305 rtx get_personality_function (tree); | |
| 0 | 306 |
| 111 | 307 /* Determine whether the LEN bytes can be moved by using several move |
| 308 instructions. Return nonzero if a call to move_by_pieces should | |
| 309 succeed. */ | |
| 310 extern bool can_move_by_pieces (unsigned HOST_WIDE_INT, unsigned int); | |
| 0 | 311 |
| 111 | 312 extern unsigned HOST_WIDE_INT highest_pow2_factor (const_tree); |
| 0 | 313 |
| 111 | 314 extern bool categorize_ctor_elements (const_tree, HOST_WIDE_INT *, |
| 145 | 315 HOST_WIDE_INT *, HOST_WIDE_INT *, |
| 316 bool *); | |
| 0 | 317 |
| 111 | 318 extern void expand_operands (tree, tree, rtx, rtx*, rtx*, |
| 319 enum expand_modifier); | |
| 0 | 320 |
| 321 /* rtl.h and tree.h were included. */ | |
| 322 /* Return an rtx for the size in bytes of the value of an expr. */ | |
| 323 extern rtx expr_size (tree); | |
| 324 | |
| 325 #endif /* GCC_EXPR_H */ |