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dbb0cd11 | 1 | /* Definitions for code generation pass of GNU compiler. |
f1717362 | 2 | Copyright (C) 1987-2016 Free Software Foundation, Inc. |
dbb0cd11 | 3 | |
f12b58b3 | 4 | This file is part of GCC. |
dbb0cd11 | 5 | |
f12b58b3 | 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 | |
8c4c00c1 | 8 | Software Foundation; either version 3, or (at your option) any later |
f12b58b3 | 9 | version. |
dbb0cd11 | 10 | |
f12b58b3 | 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. | |
dbb0cd11 | 15 | |
16 | You should have received a copy of the GNU General Public License | |
8c4c00c1 | 17 | along with GCC; see the file COPYING3. If not see |
18 | <http://www.gnu.org/licenses/>. */ | |
dbb0cd11 | 19 | |
4c74e6d9 | 20 | #ifndef GCC_EXPR_H |
21 | #define GCC_EXPR_H | |
22 | ||
dbb0cd11 | 23 | /* This is the 4th arg to `expand_expr'. |
a35a63ff | 24 | EXPAND_STACK_PARM means we are possibly expanding a call param onto |
6cf92966 | 25 | the stack. |
dbb0cd11 | 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 | |
ab716090 | 29 | is a constant that is not a legitimate address. |
68b956ae | 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 | |
a12f023f | 32 | the memory is constant and we could have propagated a constant value, |
33 | or the memory is unaligned on a STRICT_ALIGNMENT target. */ | |
6cf92966 | 34 | enum expand_modifier {EXPAND_NORMAL = 0, EXPAND_STACK_PARM, EXPAND_SUM, |
68b956ae | 35 | EXPAND_CONST_ADDRESS, EXPAND_INITIALIZER, EXPAND_WRITE, |
36 | EXPAND_MEMORY}; | |
dbb0cd11 | 37 | |
b49854c6 | 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) | |
dbb0cd11 | 45 | \f |
2c02962c | 46 | /* This structure is used to pass around information about exploded |
47 | unary, binary and trinary expressions between expand_expr_real_1 and | |
48 | friends. */ | |
49 | typedef struct separate_ops | |
50 | { | |
51 | enum tree_code code; | |
b7834994 | 52 | location_t location; |
2c02962c | 53 | tree type; |
54 | tree op0, op1, op2; | |
2c02962c | 55 | } *sepops; |
b5479824 | 56 | \f |
48e1416a | 57 | /* This is run during target initialization to set up which modes can be |
6d8b68a3 | 58 | used directly in memory and to initialize the block move optab. */ |
59 | extern void init_expr_target (void); | |
b5479824 | 60 | |
61 | /* This is run at the start of compiling a function. */ | |
35cb5232 | 62 | extern void init_expr (void); |
b5479824 | 63 | |
dbb0cd11 | 64 | /* Emit some rtl insns to move data between rtx's, converting machine modes. |
65 | Both modes must be floating or both fixed. */ | |
35cb5232 | 66 | extern void convert_move (rtx, rtx, int); |
dbb0cd11 | 67 | |
68 | /* Convert an rtx to specified machine mode and return the result. */ | |
3754d046 | 69 | extern rtx convert_to_mode (machine_mode, rtx, int); |
dbb0cd11 | 70 | |
48e657fd | 71 | /* Convert an rtx to MODE from OLDMODE and return the result. */ |
3754d046 | 72 | extern rtx convert_modes (machine_mode, machine_mode, rtx, int); |
48e657fd | 73 | |
b2d92e37 | 74 | /* Emit code to move a block Y to a block X. */ |
0378dbdc | 75 | |
76 | enum block_op_methods | |
77 | { | |
78 | BLOCK_OP_NORMAL, | |
a35a63ff | 79 | BLOCK_OP_NO_LIBCALL, |
0b25db21 | 80 | BLOCK_OP_CALL_PARM, |
81 | /* Like BLOCK_OP_NORMAL, but the libcall can be tail call optimized. */ | |
82 | BLOCK_OP_TAILCALL | |
0378dbdc | 83 | }; |
84 | ||
d8f74faa | 85 | extern GTY(()) tree block_clear_fn; |
35cb5232 | 86 | extern void init_block_move_fn (const char *); |
87 | extern void init_block_clear_fn (const char *); | |
d459e0d8 | 88 | |
35cb5232 | 89 | extern rtx emit_block_move (rtx, rtx, rtx, enum block_op_methods); |
ab608690 | 90 | extern rtx emit_block_move_via_libcall (rtx, rtx, rtx, bool); |
162719b3 | 91 | extern rtx emit_block_move_hints (rtx, rtx, rtx, enum block_op_methods, |
36d63243 | 92 | unsigned int, HOST_WIDE_INT, |
93 | unsigned HOST_WIDE_INT, | |
9db0f34d | 94 | unsigned HOST_WIDE_INT, |
36d63243 | 95 | unsigned HOST_WIDE_INT); |
16c9337c | 96 | extern bool emit_storent_insn (rtx to, rtx from); |
b5479824 | 97 | |
98 | /* Copy all or part of a value X into registers starting at REGNO. | |
99 | The number of registers to be filled is NREGS. */ | |
3754d046 | 100 | extern void move_block_to_reg (int, rtx, int, machine_mode); |
b5479824 | 101 | |
102 | /* Copy all or part of a BLKmode value X out of registers starting at REGNO. | |
103 | The number of registers to be filled is NREGS. */ | |
35cb5232 | 104 | extern void move_block_from_reg (int, rtx, int); |
b5479824 | 105 | |
b566e2e5 | 106 | /* Generate a non-consecutive group of registers represented by a PARALLEL. */ |
35cb5232 | 107 | extern rtx gen_group_rtx (rtx); |
b566e2e5 | 108 | |
2dbc68f6 | 109 | /* Load a BLKmode value into non-consecutive registers represented by a |
110 | PARALLEL. */ | |
5f4cd670 | 111 | extern void emit_group_load (rtx, rtx, tree, int); |
fe352cf1 | 112 | |
e2ff5c1b | 113 | /* Similarly, but load into new temporaries. */ |
114 | extern rtx emit_group_load_into_temps (rtx, rtx, tree, int); | |
115 | ||
b566e2e5 | 116 | /* Move a non-consecutive group of registers represented by a PARALLEL into |
117 | a non-consecutive group of registers represented by a PARALLEL. */ | |
35cb5232 | 118 | extern void emit_group_move (rtx, rtx); |
b566e2e5 | 119 | |
e2ff5c1b | 120 | /* Move a group of registers represented by a PARALLEL into pseudos. */ |
121 | extern rtx emit_group_move_into_temps (rtx); | |
122 | ||
2dbc68f6 | 123 | /* Store a BLKmode value from non-consecutive registers represented by a |
124 | PARALLEL. */ | |
5f4cd670 | 125 | extern void emit_group_store (rtx, rtx, tree, int); |
2dbc68f6 | 126 | |
933eb13a | 127 | extern rtx maybe_emit_group_store (rtx, tree); |
128 | ||
ab6d34f7 | 129 | /* Copy BLKmode object from a set of registers. */ |
7e91b548 | 130 | extern void copy_blkmode_from_reg (rtx, rtx, tree); |
25eb0f59 | 131 | |
b4eeceb9 | 132 | /* Mark REG as holding a parameter for the next CALL_INSN. |
133 | Mode is TYPE_MODE of the non-promoted parameter, or VOIDmode. */ | |
3754d046 | 134 | extern void use_reg_mode (rtx *, rtx, machine_mode); |
135 | extern void clobber_reg_mode (rtx *, rtx, machine_mode); | |
b4eeceb9 | 136 | |
3754d046 | 137 | extern rtx copy_blkmode_to_reg (machine_mode, tree); |
ee5ab2d1 | 138 | |
14602aee | 139 | /* Mark REG as holding a parameter for the next CALL_INSN. */ |
b4eeceb9 | 140 | static inline void |
141 | use_reg (rtx *fusage, rtx reg) | |
142 | { | |
143 | use_reg_mode (fusage, reg, VOIDmode); | |
144 | } | |
fe352cf1 | 145 | |
e67cfba4 | 146 | /* Mark REG as clobbered by the call with FUSAGE as CALL_INSN_FUNCTION_USAGE. */ |
147 | static inline void | |
148 | clobber_reg (rtx *fusage, rtx reg) | |
149 | { | |
150 | clobber_reg_mode (fusage, reg, VOIDmode); | |
151 | } | |
152 | ||
14602aee | 153 | /* Mark NREGS consecutive regs, starting at REGNO, as holding parameters |
154 | for the next CALL_INSN. */ | |
35cb5232 | 155 | extern void use_regs (rtx *, int, int); |
fe352cf1 | 156 | |
2dbc68f6 | 157 | /* Mark a PARALLEL as holding a parameter for the next CALL_INSN. */ |
35cb5232 | 158 | extern void use_group_regs (rtx *, rtx); |
b5479824 | 159 | |
160 | /* Write zeros through the storage of OBJECT. | |
2a631e19 | 161 | If OBJECT has BLKmode, SIZE is its length in bytes. */ |
0b25db21 | 162 | extern rtx clear_storage (rtx, rtx, enum block_op_methods); |
162719b3 | 163 | extern rtx clear_storage_hints (rtx, rtx, enum block_op_methods, |
36d63243 | 164 | unsigned int, HOST_WIDE_INT, |
165 | unsigned HOST_WIDE_INT, | |
9db0f34d | 166 | unsigned HOST_WIDE_INT, |
36d63243 | 167 | unsigned HOST_WIDE_INT); |
ab608690 | 168 | /* The same, but always output an library call. */ |
169 | rtx set_storage_via_libcall (rtx, rtx, rtx, bool); | |
b5479824 | 170 | |
7a3e5564 | 171 | /* Expand a setmem pattern; return true if successful. */ |
48e1416a | 172 | extern bool set_storage_via_setmem (rtx, rtx, rtx, unsigned int, |
36d63243 | 173 | unsigned int, HOST_WIDE_INT, |
174 | unsigned HOST_WIDE_INT, | |
9db0f34d | 175 | unsigned HOST_WIDE_INT, |
36d63243 | 176 | unsigned HOST_WIDE_INT); |
7a3e5564 | 177 | |
8136e769 | 178 | extern unsigned HOST_WIDE_INT move_by_pieces_ninsns (unsigned HOST_WIDE_INT, |
179 | unsigned int, | |
180 | unsigned int); | |
181 | ||
6ef828f9 | 182 | /* Return nonzero if it is desirable to store LEN bytes generated by |
6840589f | 183 | CONSTFUN with several move instructions by store_by_pieces |
184 | function. CONSTFUNDATA is a pointer which will be passed as argument | |
185 | in every CONSTFUN call. | |
4b297e2e | 186 | ALIGN is maximum alignment we can assume. |
187 | MEMSETP is true if this is a real memset/bzero, not a copy | |
188 | of a const string. */ | |
35cb5232 | 189 | extern int can_store_by_pieces (unsigned HOST_WIDE_INT, |
190 | rtx (*) (void *, HOST_WIDE_INT, | |
3754d046 | 191 | machine_mode), |
4b297e2e | 192 | void *, unsigned int, bool); |
6840589f | 193 | |
194 | /* Generate several move instructions to store LEN bytes generated by | |
195 | CONSTFUN to block TO. (A MEM rtx with BLKmode). CONSTFUNDATA is a | |
196 | pointer which will be passed as argument in every CONSTFUN call. | |
9fe0e1b8 | 197 | ALIGN is maximum alignment we can assume. |
4b297e2e | 198 | MEMSETP is true if this is a real memset/bzero, not a copy. |
9fe0e1b8 | 199 | Returns TO + LEN. */ |
35cb5232 | 200 | extern rtx store_by_pieces (rtx, unsigned HOST_WIDE_INT, |
3754d046 | 201 | rtx (*) (void *, HOST_WIDE_INT, machine_mode), |
4b297e2e | 202 | void *, unsigned int, bool, int); |
6840589f | 203 | |
b5479824 | 204 | /* Emit insns to set X from Y. */ |
c81fd430 | 205 | extern rtx_insn *emit_move_insn (rtx, rtx); |
f9a00e9e | 206 | extern rtx_insn *gen_move_insn (rtx, rtx); |
b5479824 | 207 | |
208 | /* Emit insns to set X from Y, with no frills. */ | |
c81fd430 | 209 | extern rtx_insn *emit_move_insn_1 (rtx, rtx); |
b5479824 | 210 | |
3754d046 | 211 | extern rtx_insn *emit_move_complex_push (machine_mode, rtx, rtx); |
c81fd430 | 212 | extern rtx_insn *emit_move_complex_parts (rtx, rtx); |
94f92c36 | 213 | extern rtx read_complex_part (rtx, bool); |
0c93c8a9 | 214 | extern void write_complex_part (rtx, rtx, bool); |
292237f3 | 215 | extern rtx read_complex_part (rtx, bool); |
3754d046 | 216 | extern rtx emit_move_resolve_push (machine_mode, rtx); |
64003036 | 217 | |
b5479824 | 218 | /* Push a block of length SIZE (perhaps variable) |
219 | and return an rtx to address the beginning of the block. */ | |
35cb5232 | 220 | extern rtx push_block (rtx, int, int); |
b5479824 | 221 | |
b5479824 | 222 | /* Generate code to push something onto the stack, given its mode and type. */ |
a95e5776 | 223 | extern bool emit_push_insn (rtx, machine_mode, tree, rtx, unsigned int, |
224 | int, rtx, int, rtx, rtx, int, rtx, bool); | |
b5479824 | 225 | |
ab6d34f7 | 226 | /* Expand an assignment that stores the value of FROM into TO. */ |
5b5037b3 | 227 | extern void expand_assignment (tree, tree, bool); |
b5479824 | 228 | |
229 | /* Generate code for computing expression EXP, | |
230 | and storing the value into TARGET. | |
231 | If SUGGEST_REG is nonzero, copy the value through a register | |
232 | and return that register, if that is possible. */ | |
292237f3 | 233 | extern rtx store_expr_with_bounds (tree, rtx, int, bool, bool, tree); |
234 | extern rtx store_expr (tree, rtx, int, bool, bool); | |
dbb0cd11 | 235 | |
236 | /* Given an rtx that may include add and multiply operations, | |
237 | generate them as insns and return a pseudo-reg containing the value. | |
238 | Useful after calling expand_expr with 1 as sum_ok. */ | |
35cb5232 | 239 | extern rtx force_operand (rtx, rtx); |
dbb0cd11 | 240 | |
16c9337c | 241 | /* Work horses for expand_expr. */ |
3754d046 | 242 | extern rtx expand_expr_real (tree, rtx, machine_mode, |
a12f023f | 243 | enum expand_modifier, rtx *, bool); |
3754d046 | 244 | extern rtx expand_expr_real_1 (tree, rtx, machine_mode, |
a12f023f | 245 | enum expand_modifier, rtx *, bool); |
3754d046 | 246 | extern rtx expand_expr_real_2 (sepops, rtx, machine_mode, |
16c9337c | 247 | enum expand_modifier); |
5135beeb | 248 | |
b5479824 | 249 | /* Generate code for computing expression EXP. |
250 | An rtx for the computed value is returned. The value is never null. | |
251 | In the case of a void EXP, const0_rtx is returned. */ | |
5135beeb | 252 | static inline rtx |
3754d046 | 253 | expand_expr (tree exp, rtx target, machine_mode mode, |
5135beeb | 254 | enum expand_modifier modifier) |
255 | { | |
a12f023f | 256 | return expand_expr_real (exp, target, mode, modifier, NULL, false); |
5135beeb | 257 | } |
b5479824 | 258 | |
8ec3c5c2 | 259 | static inline rtx |
260 | expand_normal (tree exp) | |
261 | { | |
a12f023f | 262 | return expand_expr_real (exp, NULL_RTX, VOIDmode, EXPAND_NORMAL, NULL, false); |
8ec3c5c2 | 263 | } |
264 | ||
b6d206a2 | 265 | |
53800dbe | 266 | /* Return the tree node and offset if a given argument corresponds to |
267 | a string constant. */ | |
35cb5232 | 268 | extern tree string_constant (tree, tree *); |
53800dbe | 269 | |
539a3a92 | 270 | /* Two different ways of generating switch statements. */ |
584abc98 | 271 | extern int try_casesi (tree, tree, tree, tree, rtx, rtx, rtx, int); |
272 | extern int try_tablejump (tree, tree, tree, tree, rtx, rtx, int); | |
539a3a92 | 273 | |
1f1872fd | 274 | extern int safe_from_p (const_rtx, tree, int); |
e41f0d80 | 275 | |
58d82cd0 | 276 | /* Get the personality libfunc for a function decl. */ |
277 | rtx get_personality_function (tree); | |
278 | ||
9ed99284 | 279 | /* Determine whether the LEN bytes can be moved by using several move |
280 | instructions. Return nonzero if a call to move_by_pieces should | |
281 | succeed. */ | |
282 | extern int can_move_by_pieces (unsigned HOST_WIDE_INT, unsigned int); | |
283 | ||
284 | extern unsigned HOST_WIDE_INT highest_pow2_factor (const_tree); | |
9ed99284 | 285 | |
286 | extern bool categorize_ctor_elements (const_tree, HOST_WIDE_INT *, | |
287 | HOST_WIDE_INT *, bool *); | |
288 | ||
01ee997b | 289 | extern void expand_operands (tree, tree, rtx, rtx*, rtx*, |
290 | enum expand_modifier); | |
d53441c8 | 291 | |
292 | /* rtl.h and tree.h were included. */ | |
293 | /* Return an rtx for the size in bytes of the value of an expr. */ | |
294 | extern rtx expr_size (tree); | |
295 | ||
4c74e6d9 | 296 | #endif /* GCC_EXPR_H */ |