Tristan Matthews | 0461646 | 2013-11-14 16:09:34 -0500 | [diff] [blame] | 1 | /* |
| 2 | * Stack-less Just-In-Time compiler |
| 3 | * |
| 4 | * Copyright 2009-2010 Zoltan Herczeg (hzmester@freemail.hu). All rights reserved. |
| 5 | * |
| 6 | * Redistribution and use in source and binary forms, with or without modification, are |
| 7 | * permitted provided that the following conditions are met: |
| 8 | * |
| 9 | * 1. Redistributions of source code must retain the above copyright notice, this list of |
| 10 | * conditions and the following disclaimer. |
| 11 | * |
| 12 | * 2. Redistributions in binary form must reproduce the above copyright notice, this list |
| 13 | * of conditions and the following disclaimer in the documentation and/or other materials |
| 14 | * provided with the distribution. |
| 15 | * |
| 16 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) AND CONTRIBUTORS ``AS IS'' AND ANY |
| 17 | * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 18 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT |
| 19 | * SHALL THE COPYRIGHT HOLDER(S) OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 20 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED |
| 21 | * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR |
| 22 | * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| 23 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN |
| 24 | * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 25 | */ |
| 26 | |
| 27 | /* x86 32-bit arch dependent functions. */ |
| 28 | |
| 29 | static int emit_do_imm(struct sljit_compiler *compiler, sljit_ub opcode, sljit_w imm) |
| 30 | { |
| 31 | sljit_ub *buf; |
| 32 | |
| 33 | buf = (sljit_ub*)ensure_buf(compiler, 1 + 1 + sizeof(sljit_w)); |
| 34 | FAIL_IF(!buf); |
| 35 | INC_SIZE(1 + sizeof(sljit_w)); |
| 36 | *buf++ = opcode; |
| 37 | *(sljit_w*)buf = imm; |
| 38 | return SLJIT_SUCCESS; |
| 39 | } |
| 40 | |
| 41 | static sljit_ub* generate_far_jump_code(struct sljit_jump *jump, sljit_ub *code_ptr, int type) |
| 42 | { |
| 43 | if (type == SLJIT_JUMP) { |
| 44 | *code_ptr++ = 0xe9; |
| 45 | jump->addr++; |
| 46 | } |
| 47 | else if (type >= SLJIT_FAST_CALL) { |
| 48 | *code_ptr++ = 0xe8; |
| 49 | jump->addr++; |
| 50 | } |
| 51 | else { |
| 52 | *code_ptr++ = 0x0f; |
| 53 | *code_ptr++ = get_jump_code(type); |
| 54 | jump->addr += 2; |
| 55 | } |
| 56 | |
| 57 | if (jump->flags & JUMP_LABEL) |
| 58 | jump->flags |= PATCH_MW; |
| 59 | else |
| 60 | *(sljit_w*)code_ptr = jump->u.target - (jump->addr + 4); |
| 61 | code_ptr += 4; |
| 62 | |
| 63 | return code_ptr; |
| 64 | } |
| 65 | |
| 66 | SLJIT_API_FUNC_ATTRIBUTE int sljit_emit_enter(struct sljit_compiler *compiler, int args, int temporaries, int generals, int local_size) |
| 67 | { |
| 68 | int size; |
| 69 | sljit_ub *buf; |
| 70 | |
| 71 | CHECK_ERROR(); |
| 72 | check_sljit_emit_enter(compiler, args, temporaries, generals, local_size); |
| 73 | |
| 74 | compiler->temporaries = temporaries; |
| 75 | compiler->generals = generals; |
| 76 | compiler->args = args; |
| 77 | compiler->flags_saved = 0; |
| 78 | |
| 79 | #if (defined SLJIT_X86_32_FASTCALL && SLJIT_X86_32_FASTCALL) |
| 80 | size = 1 + (generals <= 3 ? generals : 3) + (args > 0 ? (args * 2) : 0) + (args > 2 ? 2 : 0); |
| 81 | #else |
| 82 | size = 1 + (generals <= 3 ? generals : 3) + (args > 0 ? (2 + args * 3) : 0); |
| 83 | #endif |
| 84 | buf = (sljit_ub*)ensure_buf(compiler, 1 + size); |
| 85 | FAIL_IF(!buf); |
| 86 | |
| 87 | INC_SIZE(size); |
| 88 | PUSH_REG(reg_map[TMP_REGISTER]); |
| 89 | #if !(defined SLJIT_X86_32_FASTCALL && SLJIT_X86_32_FASTCALL) |
| 90 | if (args > 0) { |
| 91 | *buf++ = 0x8b; |
| 92 | *buf++ = 0xc4 | (reg_map[TMP_REGISTER] << 3); |
| 93 | } |
| 94 | #endif |
| 95 | if (generals > 2) |
| 96 | PUSH_REG(reg_map[SLJIT_GENERAL_REG3]); |
| 97 | if (generals > 1) |
| 98 | PUSH_REG(reg_map[SLJIT_GENERAL_REG2]); |
| 99 | if (generals > 0) |
| 100 | PUSH_REG(reg_map[SLJIT_GENERAL_REG1]); |
| 101 | |
| 102 | #if (defined SLJIT_X86_32_FASTCALL && SLJIT_X86_32_FASTCALL) |
| 103 | if (args > 0) { |
| 104 | *buf++ = 0x8b; |
| 105 | *buf++ = 0xc0 | (reg_map[SLJIT_GENERAL_REG1] << 3) | reg_map[SLJIT_TEMPORARY_REG3]; |
| 106 | } |
| 107 | if (args > 1) { |
| 108 | *buf++ = 0x8b; |
| 109 | *buf++ = 0xc0 | (reg_map[SLJIT_GENERAL_REG2] << 3) | reg_map[SLJIT_TEMPORARY_REG2]; |
| 110 | } |
| 111 | if (args > 2) { |
| 112 | *buf++ = 0x8b; |
| 113 | *buf++ = 0x44 | (reg_map[SLJIT_GENERAL_REG3] << 3); |
| 114 | *buf++ = 0x24; |
| 115 | *buf++ = sizeof(sljit_w) * (3 + 2); /* generals >= 3 as well. */ |
| 116 | } |
| 117 | #else |
| 118 | if (args > 0) { |
| 119 | *buf++ = 0x8b; |
| 120 | *buf++ = 0x40 | (reg_map[SLJIT_GENERAL_REG1] << 3) | reg_map[TMP_REGISTER]; |
| 121 | *buf++ = sizeof(sljit_w) * 2; |
| 122 | } |
| 123 | if (args > 1) { |
| 124 | *buf++ = 0x8b; |
| 125 | *buf++ = 0x40 | (reg_map[SLJIT_GENERAL_REG2] << 3) | reg_map[TMP_REGISTER]; |
| 126 | *buf++ = sizeof(sljit_w) * 3; |
| 127 | } |
| 128 | if (args > 2) { |
| 129 | *buf++ = 0x8b; |
| 130 | *buf++ = 0x40 | (reg_map[SLJIT_GENERAL_REG3] << 3) | reg_map[TMP_REGISTER]; |
| 131 | *buf++ = sizeof(sljit_w) * 4; |
| 132 | } |
| 133 | #endif |
| 134 | |
| 135 | local_size = (local_size + sizeof(sljit_uw) - 1) & ~(sizeof(sljit_uw) - 1); |
| 136 | compiler->temporaries_start = local_size; |
| 137 | if (temporaries > 3) |
| 138 | local_size += (temporaries - 3) * sizeof(sljit_uw); |
| 139 | compiler->generals_start = local_size; |
| 140 | if (generals > 3) |
| 141 | local_size += (generals - 3) * sizeof(sljit_uw); |
| 142 | |
| 143 | #ifdef _WIN32 |
| 144 | if (local_size > 1024) { |
| 145 | FAIL_IF(emit_do_imm(compiler, 0xb8 + reg_map[SLJIT_TEMPORARY_REG1], local_size)); |
| 146 | FAIL_IF(sljit_emit_ijump(compiler, SLJIT_CALL1, SLJIT_IMM, SLJIT_FUNC_OFFSET(sljit_touch_stack))); |
| 147 | } |
| 148 | #endif |
| 149 | |
| 150 | compiler->local_size = local_size; |
| 151 | if (local_size > 0) |
| 152 | return emit_non_cum_binary(compiler, 0x2b, 0x29, 0x5 << 3, 0x2d, |
| 153 | SLJIT_LOCALS_REG, 0, SLJIT_LOCALS_REG, 0, SLJIT_IMM, local_size); |
| 154 | |
| 155 | /* Mov arguments to general registers. */ |
| 156 | return SLJIT_SUCCESS; |
| 157 | } |
| 158 | |
| 159 | SLJIT_API_FUNC_ATTRIBUTE void sljit_fake_enter(struct sljit_compiler *compiler, int args, int temporaries, int generals, int local_size) |
| 160 | { |
| 161 | CHECK_ERROR_VOID(); |
| 162 | check_sljit_fake_enter(compiler, args, temporaries, generals, local_size); |
| 163 | |
| 164 | compiler->temporaries = temporaries; |
| 165 | compiler->generals = generals; |
| 166 | compiler->args = args; |
| 167 | compiler->local_size = (local_size + sizeof(sljit_uw) - 1) & ~(sizeof(sljit_uw) - 1); |
| 168 | compiler->temporaries_start = compiler->local_size; |
| 169 | if (temporaries > 3) |
| 170 | compiler->local_size += (temporaries - 3) * sizeof(sljit_uw); |
| 171 | compiler->generals_start = compiler->local_size; |
| 172 | if (generals > 3) |
| 173 | compiler->local_size += (generals - 3) * sizeof(sljit_uw); |
| 174 | } |
| 175 | |
| 176 | SLJIT_API_FUNC_ATTRIBUTE int sljit_emit_return(struct sljit_compiler *compiler, int src, sljit_w srcw) |
| 177 | { |
| 178 | int size; |
| 179 | sljit_ub *buf; |
| 180 | |
| 181 | CHECK_ERROR(); |
| 182 | check_sljit_emit_return(compiler, src, srcw); |
| 183 | SLJIT_ASSERT(compiler->args >= 0); |
| 184 | |
| 185 | compiler->flags_saved = 0; |
| 186 | CHECK_EXTRA_REGS(src, srcw, (void)0); |
| 187 | |
| 188 | if (src != SLJIT_UNUSED && src != SLJIT_RETURN_REG) |
| 189 | FAIL_IF(emit_mov(compiler, SLJIT_RETURN_REG, 0, src, srcw)); |
| 190 | |
| 191 | if (compiler->local_size > 0) |
| 192 | FAIL_IF(emit_cum_binary(compiler, 0x03, 0x01, 0x0 << 3, 0x05, |
| 193 | SLJIT_LOCALS_REG, 0, SLJIT_LOCALS_REG, 0, SLJIT_IMM, compiler->local_size)); |
| 194 | |
| 195 | size = 2 + (compiler->generals <= 3 ? compiler->generals : 3); |
| 196 | #if (defined SLJIT_X86_32_FASTCALL && SLJIT_X86_32_FASTCALL) |
| 197 | if (compiler->args > 2) |
| 198 | size += 2; |
| 199 | #else |
| 200 | if (compiler->args > 0) |
| 201 | size += 2; |
| 202 | #endif |
| 203 | buf = (sljit_ub*)ensure_buf(compiler, 1 + size); |
| 204 | FAIL_IF(!buf); |
| 205 | |
| 206 | INC_SIZE(size); |
| 207 | |
| 208 | if (compiler->generals > 0) |
| 209 | POP_REG(reg_map[SLJIT_GENERAL_REG1]); |
| 210 | if (compiler->generals > 1) |
| 211 | POP_REG(reg_map[SLJIT_GENERAL_REG2]); |
| 212 | if (compiler->generals > 2) |
| 213 | POP_REG(reg_map[SLJIT_GENERAL_REG3]); |
| 214 | POP_REG(reg_map[TMP_REGISTER]); |
| 215 | #if (defined SLJIT_X86_32_FASTCALL && SLJIT_X86_32_FASTCALL) |
| 216 | if (compiler->args > 2) |
| 217 | RETN(sizeof(sljit_w)); |
| 218 | else |
| 219 | RET(); |
| 220 | #else |
| 221 | if (compiler->args > 0) |
| 222 | RETN(compiler->args * sizeof(sljit_w)); |
| 223 | else |
| 224 | RET(); |
| 225 | #endif |
| 226 | |
| 227 | return SLJIT_SUCCESS; |
| 228 | } |
| 229 | |
| 230 | /* --------------------------------------------------------------------- */ |
| 231 | /* Operators */ |
| 232 | /* --------------------------------------------------------------------- */ |
| 233 | |
| 234 | /* Size contains the flags as well. */ |
| 235 | static sljit_ub* emit_x86_instruction(struct sljit_compiler *compiler, int size, |
| 236 | /* The register or immediate operand. */ |
| 237 | int a, sljit_w imma, |
| 238 | /* The general operand (not immediate). */ |
| 239 | int b, sljit_w immb) |
| 240 | { |
| 241 | sljit_ub *buf; |
| 242 | sljit_ub *buf_ptr; |
| 243 | int flags = size & ~0xf; |
| 244 | int inst_size; |
| 245 | |
| 246 | /* Both cannot be switched on. */ |
| 247 | SLJIT_ASSERT((flags & (EX86_BIN_INS | EX86_SHIFT_INS)) != (EX86_BIN_INS | EX86_SHIFT_INS)); |
| 248 | /* Size flags not allowed for typed instructions. */ |
| 249 | SLJIT_ASSERT(!(flags & (EX86_BIN_INS | EX86_SHIFT_INS)) || (flags & (EX86_BYTE_ARG | EX86_HALF_ARG)) == 0); |
| 250 | /* Both size flags cannot be switched on. */ |
| 251 | SLJIT_ASSERT((flags & (EX86_BYTE_ARG | EX86_HALF_ARG)) != (EX86_BYTE_ARG | EX86_HALF_ARG)); |
| 252 | #if (defined SLJIT_SSE2 && SLJIT_SSE2) |
| 253 | /* SSE2 and immediate is not possible. */ |
| 254 | SLJIT_ASSERT(!(a & SLJIT_IMM) || !(flags & EX86_SSE2)); |
| 255 | #endif |
| 256 | |
| 257 | size &= 0xf; |
| 258 | inst_size = size; |
| 259 | |
| 260 | #if (defined SLJIT_SSE2 && SLJIT_SSE2) |
| 261 | if (flags & EX86_PREF_F2) |
| 262 | inst_size++; |
| 263 | #endif |
| 264 | if (flags & EX86_PREF_66) |
| 265 | inst_size++; |
| 266 | |
| 267 | /* Calculate size of b. */ |
| 268 | inst_size += 1; /* mod r/m byte. */ |
| 269 | if (b & SLJIT_MEM) { |
| 270 | if ((b & 0x0f) == SLJIT_UNUSED) |
| 271 | inst_size += sizeof(sljit_w); |
| 272 | else if (immb != 0 && !(b & 0xf0)) { |
| 273 | /* Immediate operand. */ |
| 274 | if (immb <= 127 && immb >= -128) |
| 275 | inst_size += sizeof(sljit_b); |
| 276 | else |
| 277 | inst_size += sizeof(sljit_w); |
| 278 | } |
| 279 | |
| 280 | if ((b & 0xf) == SLJIT_LOCALS_REG && !(b & 0xf0)) |
| 281 | b |= SLJIT_LOCALS_REG << 4; |
| 282 | |
| 283 | if ((b & 0xf0) != SLJIT_UNUSED) |
| 284 | inst_size += 1; /* SIB byte. */ |
| 285 | } |
| 286 | |
| 287 | /* Calculate size of a. */ |
| 288 | if (a & SLJIT_IMM) { |
| 289 | if (flags & EX86_BIN_INS) { |
| 290 | if (imma <= 127 && imma >= -128) { |
| 291 | inst_size += 1; |
| 292 | flags |= EX86_BYTE_ARG; |
| 293 | } else |
| 294 | inst_size += 4; |
| 295 | } |
| 296 | else if (flags & EX86_SHIFT_INS) { |
| 297 | imma &= 0x1f; |
| 298 | if (imma != 1) { |
| 299 | inst_size ++; |
| 300 | flags |= EX86_BYTE_ARG; |
| 301 | } |
| 302 | } else if (flags & EX86_BYTE_ARG) |
| 303 | inst_size++; |
| 304 | else if (flags & EX86_HALF_ARG) |
| 305 | inst_size += sizeof(short); |
| 306 | else |
| 307 | inst_size += sizeof(sljit_w); |
| 308 | } |
| 309 | else |
| 310 | SLJIT_ASSERT(!(flags & EX86_SHIFT_INS) || a == SLJIT_PREF_SHIFT_REG); |
| 311 | |
| 312 | buf = (sljit_ub*)ensure_buf(compiler, 1 + inst_size); |
| 313 | PTR_FAIL_IF(!buf); |
| 314 | |
| 315 | /* Encoding the byte. */ |
| 316 | INC_SIZE(inst_size); |
| 317 | #if (defined SLJIT_SSE2 && SLJIT_SSE2) |
| 318 | if (flags & EX86_PREF_F2) |
| 319 | *buf++ = 0xf2; |
| 320 | #endif |
| 321 | if (flags & EX86_PREF_66) |
| 322 | *buf++ = 0x66; |
| 323 | |
| 324 | buf_ptr = buf + size; |
| 325 | |
| 326 | /* Encode mod/rm byte. */ |
| 327 | if (!(flags & EX86_SHIFT_INS)) { |
| 328 | if ((flags & EX86_BIN_INS) && (a & SLJIT_IMM)) |
| 329 | *buf = (flags & EX86_BYTE_ARG) ? 0x83 : 0x81; |
| 330 | |
| 331 | if ((a & SLJIT_IMM) || (a == 0)) |
| 332 | *buf_ptr = 0; |
| 333 | #if (defined SLJIT_SSE2 && SLJIT_SSE2) |
| 334 | else if (!(flags & EX86_SSE2)) |
| 335 | *buf_ptr = reg_map[a] << 3; |
| 336 | else |
| 337 | *buf_ptr = a << 3; |
| 338 | #else |
| 339 | else |
| 340 | *buf_ptr = reg_map[a] << 3; |
| 341 | #endif |
| 342 | } |
| 343 | else { |
| 344 | if (a & SLJIT_IMM) { |
| 345 | if (imma == 1) |
| 346 | *buf = 0xd1; |
| 347 | else |
| 348 | *buf = 0xc1; |
| 349 | } else |
| 350 | *buf = 0xd3; |
| 351 | *buf_ptr = 0; |
| 352 | } |
| 353 | |
| 354 | if (!(b & SLJIT_MEM)) |
| 355 | #if (defined SLJIT_SSE2 && SLJIT_SSE2) |
| 356 | *buf_ptr++ |= 0xc0 + ((!(flags & EX86_SSE2)) ? reg_map[b] : b); |
| 357 | #else |
| 358 | *buf_ptr++ |= 0xc0 + reg_map[b]; |
| 359 | #endif |
| 360 | else if ((b & 0x0f) != SLJIT_UNUSED) { |
| 361 | if ((b & 0xf0) == SLJIT_UNUSED || (b & 0xf0) == (SLJIT_LOCALS_REG << 4)) { |
| 362 | if (immb != 0) { |
| 363 | if (immb <= 127 && immb >= -128) |
| 364 | *buf_ptr |= 0x40; |
| 365 | else |
| 366 | *buf_ptr |= 0x80; |
| 367 | } |
| 368 | |
| 369 | if ((b & 0xf0) == SLJIT_UNUSED) |
| 370 | *buf_ptr++ |= reg_map[b & 0x0f]; |
| 371 | else { |
| 372 | *buf_ptr++ |= 0x04; |
| 373 | *buf_ptr++ = reg_map[b & 0x0f] | (reg_map[(b >> 4) & 0x0f] << 3); |
| 374 | } |
| 375 | |
| 376 | if (immb != 0) { |
| 377 | if (immb <= 127 && immb >= -128) |
| 378 | *buf_ptr++ = immb; /* 8 bit displacement. */ |
| 379 | else { |
| 380 | *(sljit_w*)buf_ptr = immb; /* 32 bit displacement. */ |
| 381 | buf_ptr += sizeof(sljit_w); |
| 382 | } |
| 383 | } |
| 384 | } |
| 385 | else { |
| 386 | *buf_ptr++ |= 0x04; |
| 387 | *buf_ptr++ = reg_map[b & 0x0f] | (reg_map[(b >> 4) & 0x0f] << 3) | (immb << 6); |
| 388 | } |
| 389 | } |
| 390 | else { |
| 391 | *buf_ptr++ |= 0x05; |
| 392 | *(sljit_w*)buf_ptr = immb; /* 32 bit displacement. */ |
| 393 | buf_ptr += sizeof(sljit_w); |
| 394 | } |
| 395 | |
| 396 | if (a & SLJIT_IMM) { |
| 397 | if (flags & EX86_BYTE_ARG) |
| 398 | *buf_ptr = imma; |
| 399 | else if (flags & EX86_HALF_ARG) |
| 400 | *(short*)buf_ptr = imma; |
| 401 | else if (!(flags & EX86_SHIFT_INS)) |
| 402 | *(sljit_w*)buf_ptr = imma; |
| 403 | } |
| 404 | |
| 405 | return !(flags & EX86_SHIFT_INS) ? buf : (buf + 1); |
| 406 | } |
| 407 | |
| 408 | /* --------------------------------------------------------------------- */ |
| 409 | /* Call / return instructions */ |
| 410 | /* --------------------------------------------------------------------- */ |
| 411 | |
| 412 | static SLJIT_INLINE int call_with_args(struct sljit_compiler *compiler, int type) |
| 413 | { |
| 414 | sljit_ub *buf; |
| 415 | |
| 416 | #if (defined SLJIT_X86_32_FASTCALL && SLJIT_X86_32_FASTCALL) |
| 417 | buf = (sljit_ub*)ensure_buf(compiler, type >= SLJIT_CALL3 ? 1 + 2 + 1 : 1 + 2); |
| 418 | FAIL_IF(!buf); |
| 419 | INC_SIZE(type >= SLJIT_CALL3 ? 2 + 1 : 2); |
| 420 | |
| 421 | if (type >= SLJIT_CALL3) |
| 422 | PUSH_REG(reg_map[SLJIT_TEMPORARY_REG3]); |
| 423 | *buf++ = 0x8b; |
| 424 | *buf++ = 0xc0 | (reg_map[SLJIT_TEMPORARY_REG3] << 3) | reg_map[SLJIT_TEMPORARY_REG1]; |
| 425 | #else |
| 426 | buf = (sljit_ub*)ensure_buf(compiler, type - SLJIT_CALL0 + 1); |
| 427 | FAIL_IF(!buf); |
| 428 | INC_SIZE(type - SLJIT_CALL0); |
| 429 | if (type >= SLJIT_CALL3) |
| 430 | PUSH_REG(reg_map[SLJIT_TEMPORARY_REG3]); |
| 431 | if (type >= SLJIT_CALL2) |
| 432 | PUSH_REG(reg_map[SLJIT_TEMPORARY_REG2]); |
| 433 | PUSH_REG(reg_map[SLJIT_TEMPORARY_REG1]); |
| 434 | #endif |
| 435 | return SLJIT_SUCCESS; |
| 436 | } |
| 437 | |
| 438 | SLJIT_API_FUNC_ATTRIBUTE int sljit_emit_fast_enter(struct sljit_compiler *compiler, int dst, sljit_w dstw, int args, int temporaries, int generals, int local_size) |
| 439 | { |
| 440 | sljit_ub *buf; |
| 441 | |
| 442 | CHECK_ERROR(); |
| 443 | check_sljit_emit_fast_enter(compiler, dst, dstw, args, temporaries, generals, local_size); |
| 444 | |
| 445 | compiler->temporaries = temporaries; |
| 446 | compiler->generals = generals; |
| 447 | compiler->args = args; |
| 448 | compiler->local_size = (local_size + sizeof(sljit_uw) - 1) & ~(sizeof(sljit_uw) - 1); |
| 449 | compiler->temporaries_start = compiler->local_size; |
| 450 | if (temporaries > 3) |
| 451 | compiler->local_size += (temporaries - 3) * sizeof(sljit_uw); |
| 452 | compiler->generals_start = compiler->local_size; |
| 453 | if (generals > 3) |
| 454 | compiler->local_size += (generals - 3) * sizeof(sljit_uw); |
| 455 | |
| 456 | CHECK_EXTRA_REGS(dst, dstw, (void)0); |
| 457 | |
| 458 | if (dst >= SLJIT_TEMPORARY_REG1 && dst <= SLJIT_NO_REGISTERS) { |
| 459 | buf = (sljit_ub*)ensure_buf(compiler, 1 + 1); |
| 460 | FAIL_IF(!buf); |
| 461 | |
| 462 | INC_SIZE(1); |
| 463 | POP_REG(reg_map[dst]); |
| 464 | return SLJIT_SUCCESS; |
| 465 | } |
| 466 | else if (dst & SLJIT_MEM) { |
| 467 | buf = emit_x86_instruction(compiler, 1, 0, 0, dst, dstw); |
| 468 | FAIL_IF(!buf); |
| 469 | *buf++ = 0x8f; |
| 470 | return SLJIT_SUCCESS; |
| 471 | } |
| 472 | |
| 473 | /* For UNUSED dst. Uncommon, but possible. */ |
| 474 | buf = (sljit_ub*)ensure_buf(compiler, 1 + 1); |
| 475 | FAIL_IF(!buf); |
| 476 | |
| 477 | INC_SIZE(1); |
| 478 | POP_REG(reg_map[TMP_REGISTER]); |
| 479 | return SLJIT_SUCCESS; |
| 480 | } |
| 481 | |
| 482 | SLJIT_API_FUNC_ATTRIBUTE int sljit_emit_fast_return(struct sljit_compiler *compiler, int src, sljit_w srcw) |
| 483 | { |
| 484 | sljit_ub *buf; |
| 485 | |
| 486 | CHECK_ERROR(); |
| 487 | check_sljit_emit_fast_return(compiler, src, srcw); |
| 488 | |
| 489 | CHECK_EXTRA_REGS(src, srcw, (void)0); |
| 490 | |
| 491 | if (src >= SLJIT_TEMPORARY_REG1 && src <= SLJIT_NO_REGISTERS) { |
| 492 | buf = (sljit_ub*)ensure_buf(compiler, 1 + 1 + 1); |
| 493 | FAIL_IF(!buf); |
| 494 | |
| 495 | INC_SIZE(1 + 1); |
| 496 | PUSH_REG(reg_map[src]); |
| 497 | } |
| 498 | else if (src & SLJIT_MEM) { |
| 499 | buf = emit_x86_instruction(compiler, 1, 0, 0, src, srcw); |
| 500 | FAIL_IF(!buf); |
| 501 | *buf++ = 0xff; |
| 502 | *buf |= 6 << 3; |
| 503 | |
| 504 | buf = (sljit_ub*)ensure_buf(compiler, 1 + 1); |
| 505 | FAIL_IF(!buf); |
| 506 | INC_SIZE(1); |
| 507 | } |
| 508 | else { |
| 509 | /* SLJIT_IMM. */ |
| 510 | buf = (sljit_ub*)ensure_buf(compiler, 1 + 5 + 1); |
| 511 | FAIL_IF(!buf); |
| 512 | |
| 513 | INC_SIZE(5 + 1); |
| 514 | *buf++ = 0x68; |
| 515 | *(sljit_w*)buf = srcw; |
| 516 | buf += sizeof(sljit_w); |
| 517 | } |
| 518 | |
| 519 | RET(); |
| 520 | return SLJIT_SUCCESS; |
| 521 | } |