1 /* 2 * Stack-less Just-In-Time compiler 3 * 4 * Copyright 2009-2012 Zoltan Herczeg (hzmester (at) 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 sljit_s32 emit_do_imm(struct sljit_compiler *compiler, sljit_u8 opcode, sljit_sw imm) 30 { 31 sljit_u8 *inst; 32 33 inst = (sljit_u8*)ensure_buf(compiler, 1 + 1 + sizeof(sljit_sw)); 34 FAIL_IF(!inst); 35 INC_SIZE(1 + sizeof(sljit_sw)); 36 *inst++ = opcode; 37 sljit_unaligned_store_sw(inst, imm); 38 return SLJIT_SUCCESS; 39 } 40 41 static sljit_u8* generate_far_jump_code(struct sljit_jump *jump, sljit_u8 *code_ptr, sljit_s32 type) 42 { 43 if (type == SLJIT_JUMP) { 44 *code_ptr++ = JMP_i32; 45 jump->addr++; 46 } 47 else if (type >= SLJIT_FAST_CALL) { 48 *code_ptr++ = CALL_i32; 49 jump->addr++; 50 } 51 else { 52 *code_ptr++ = GROUP_0F; 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_unaligned_store_sw(code_ptr, jump->u.target - (jump->addr + 4)); 61 code_ptr += 4; 62 63 return code_ptr; 64 } 65 66 SLJIT_API_FUNC_ATTRIBUTE sljit_s32 sljit_emit_enter(struct sljit_compiler *compiler, 67 sljit_s32 options, sljit_s32 args, sljit_s32 scratches, sljit_s32 saveds, 68 sljit_s32 fscratches, sljit_s32 fsaveds, sljit_s32 local_size) 69 { 70 sljit_s32 size; 71 sljit_u8 *inst; 72 73 CHECK_ERROR(); 74 CHECK(check_sljit_emit_enter(compiler, options, args, scratches, saveds, fscratches, fsaveds, local_size)); 75 set_emit_enter(compiler, options, args, scratches, saveds, fscratches, fsaveds, local_size); 76 77 compiler->args = args; 78 compiler->flags_saved = 0; 79 80 size = 1 + (scratches > 7 ? (scratches - 7) : 0) + (saveds <= 3 ? saveds : 3); 81 #if (defined SLJIT_X86_32_FASTCALL && SLJIT_X86_32_FASTCALL) 82 size += (args > 0 ? (args * 2) : 0) + (args > 2 ? 2 : 0); 83 #else 84 size += (args > 0 ? (2 + args * 3) : 0); 85 #endif 86 inst = (sljit_u8*)ensure_buf(compiler, 1 + size); 87 FAIL_IF(!inst); 88 89 INC_SIZE(size); 90 PUSH_REG(reg_map[TMP_REG1]); 91 #if !(defined SLJIT_X86_32_FASTCALL && SLJIT_X86_32_FASTCALL) 92 if (args > 0) { 93 *inst++ = MOV_r_rm; 94 *inst++ = MOD_REG | (reg_map[TMP_REG1] << 3) | 0x4 /* esp */; 95 } 96 #endif 97 if (saveds > 2 || scratches > 7) 98 PUSH_REG(reg_map[SLJIT_S2]); 99 if (saveds > 1 || scratches > 8) 100 PUSH_REG(reg_map[SLJIT_S1]); 101 if (saveds > 0 || scratches > 9) 102 PUSH_REG(reg_map[SLJIT_S0]); 103 104 #if (defined SLJIT_X86_32_FASTCALL && SLJIT_X86_32_FASTCALL) 105 if (args > 0) { 106 *inst++ = MOV_r_rm; 107 *inst++ = MOD_REG | (reg_map[SLJIT_S0] << 3) | reg_map[SLJIT_R2]; 108 } 109 if (args > 1) { 110 *inst++ = MOV_r_rm; 111 *inst++ = MOD_REG | (reg_map[SLJIT_S1] << 3) | reg_map[SLJIT_R1]; 112 } 113 if (args > 2) { 114 *inst++ = MOV_r_rm; 115 *inst++ = MOD_DISP8 | (reg_map[SLJIT_S2] << 3) | 0x4 /* esp */; 116 *inst++ = 0x24; 117 *inst++ = sizeof(sljit_sw) * (3 + 2); /* saveds >= 3 as well. */ 118 } 119 #else 120 if (args > 0) { 121 *inst++ = MOV_r_rm; 122 *inst++ = MOD_DISP8 | (reg_map[SLJIT_S0] << 3) | reg_map[TMP_REG1]; 123 *inst++ = sizeof(sljit_sw) * 2; 124 } 125 if (args > 1) { 126 *inst++ = MOV_r_rm; 127 *inst++ = MOD_DISP8 | (reg_map[SLJIT_S1] << 3) | reg_map[TMP_REG1]; 128 *inst++ = sizeof(sljit_sw) * 3; 129 } 130 if (args > 2) { 131 *inst++ = MOV_r_rm; 132 *inst++ = MOD_DISP8 | (reg_map[SLJIT_S2] << 3) | reg_map[TMP_REG1]; 133 *inst++ = sizeof(sljit_sw) * 4; 134 } 135 #endif 136 137 SLJIT_COMPILE_ASSERT(SLJIT_LOCALS_OFFSET >= (2 + 4) * sizeof(sljit_uw), require_at_least_two_words); 138 #if defined(__APPLE__) 139 /* Ignore pushed registers and SLJIT_LOCALS_OFFSET when computing the aligned local size. */ 140 saveds = (2 + (scratches > 7 ? (scratches - 7) : 0) + (saveds <= 3 ? saveds : 3)) * sizeof(sljit_uw); 141 local_size = ((SLJIT_LOCALS_OFFSET + saveds + local_size + 15) & ~15) - saveds; 142 #else 143 if (options & SLJIT_DOUBLE_ALIGNMENT) { 144 local_size = SLJIT_LOCALS_OFFSET + ((local_size + 7) & ~7); 145 146 inst = (sljit_u8*)ensure_buf(compiler, 1 + 17); 147 FAIL_IF(!inst); 148 149 INC_SIZE(17); 150 inst[0] = MOV_r_rm; 151 inst[1] = MOD_REG | (reg_map[TMP_REG1] << 3) | reg_map[SLJIT_SP]; 152 inst[2] = GROUP_F7; 153 inst[3] = MOD_REG | (0 << 3) | reg_map[SLJIT_SP]; 154 sljit_unaligned_store_sw(inst + 4, 0x4); 155 inst[8] = JNE_i8; 156 inst[9] = 6; 157 inst[10] = GROUP_BINARY_81; 158 inst[11] = MOD_REG | (5 << 3) | reg_map[SLJIT_SP]; 159 sljit_unaligned_store_sw(inst + 12, 0x4); 160 inst[16] = PUSH_r + reg_map[TMP_REG1]; 161 } 162 else 163 local_size = SLJIT_LOCALS_OFFSET + ((local_size + 3) & ~3); 164 #endif 165 166 compiler->local_size = local_size; 167 #ifdef _WIN32 168 if (local_size > 1024) { 169 #if (defined SLJIT_X86_32_FASTCALL && SLJIT_X86_32_FASTCALL) 170 FAIL_IF(emit_do_imm(compiler, MOV_r_i32 + reg_map[SLJIT_R0], local_size)); 171 #else 172 local_size -= SLJIT_LOCALS_OFFSET; 173 FAIL_IF(emit_do_imm(compiler, MOV_r_i32 + reg_map[SLJIT_R0], local_size)); 174 FAIL_IF(emit_non_cum_binary(compiler, SUB_r_rm, SUB_rm_r, SUB, SUB_EAX_i32, 175 SLJIT_SP, 0, SLJIT_SP, 0, SLJIT_IMM, SLJIT_LOCALS_OFFSET)); 176 #endif 177 FAIL_IF(sljit_emit_ijump(compiler, SLJIT_CALL1, SLJIT_IMM, SLJIT_FUNC_OFFSET(sljit_grow_stack))); 178 } 179 #endif 180 181 SLJIT_ASSERT(local_size > 0); 182 return emit_non_cum_binary(compiler, SUB_r_rm, SUB_rm_r, SUB, SUB_EAX_i32, 183 SLJIT_SP, 0, SLJIT_SP, 0, SLJIT_IMM, local_size); 184 } 185 186 SLJIT_API_FUNC_ATTRIBUTE sljit_s32 sljit_set_context(struct sljit_compiler *compiler, 187 sljit_s32 options, sljit_s32 args, sljit_s32 scratches, sljit_s32 saveds, 188 sljit_s32 fscratches, sljit_s32 fsaveds, sljit_s32 local_size) 189 { 190 CHECK_ERROR(); 191 CHECK(check_sljit_set_context(compiler, options, args, scratches, saveds, fscratches, fsaveds, local_size)); 192 set_set_context(compiler, options, args, scratches, saveds, fscratches, fsaveds, local_size); 193 194 compiler->args = args; 195 196 #if defined(__APPLE__) 197 saveds = (2 + (scratches > 7 ? (scratches - 7) : 0) + (saveds <= 3 ? saveds : 3)) * sizeof(sljit_uw); 198 compiler->local_size = ((SLJIT_LOCALS_OFFSET + saveds + local_size + 15) & ~15) - saveds; 199 #else 200 if (options & SLJIT_DOUBLE_ALIGNMENT) 201 compiler->local_size = SLJIT_LOCALS_OFFSET + ((local_size + 7) & ~7); 202 else 203 compiler->local_size = SLJIT_LOCALS_OFFSET + ((local_size + 3) & ~3); 204 #endif 205 return SLJIT_SUCCESS; 206 } 207 208 SLJIT_API_FUNC_ATTRIBUTE sljit_s32 sljit_emit_return(struct sljit_compiler *compiler, sljit_s32 op, sljit_s32 src, sljit_sw srcw) 209 { 210 sljit_s32 size; 211 sljit_u8 *inst; 212 213 CHECK_ERROR(); 214 CHECK(check_sljit_emit_return(compiler, op, src, srcw)); 215 SLJIT_ASSERT(compiler->args >= 0); 216 217 compiler->flags_saved = 0; 218 FAIL_IF(emit_mov_before_return(compiler, op, src, srcw)); 219 220 SLJIT_ASSERT(compiler->local_size > 0); 221 FAIL_IF(emit_cum_binary(compiler, ADD_r_rm, ADD_rm_r, ADD, ADD_EAX_i32, 222 SLJIT_SP, 0, SLJIT_SP, 0, SLJIT_IMM, compiler->local_size)); 223 224 #if !defined(__APPLE__) 225 if (compiler->options & SLJIT_DOUBLE_ALIGNMENT) { 226 inst = (sljit_u8*)ensure_buf(compiler, 1 + 3); 227 FAIL_IF(!inst); 228 229 INC_SIZE(3); 230 inst[0] = MOV_r_rm; 231 inst[1] = (reg_map[SLJIT_SP] << 3) | 0x4 /* SIB */; 232 inst[2] = (4 << 3) | reg_map[SLJIT_SP]; 233 } 234 #endif 235 236 size = 2 + (compiler->scratches > 7 ? (compiler->scratches - 7) : 0) + 237 (compiler->saveds <= 3 ? compiler->saveds : 3); 238 #if (defined SLJIT_X86_32_FASTCALL && SLJIT_X86_32_FASTCALL) 239 if (compiler->args > 2) 240 size += 2; 241 #else 242 if (compiler->args > 0) 243 size += 2; 244 #endif 245 inst = (sljit_u8*)ensure_buf(compiler, 1 + size); 246 FAIL_IF(!inst); 247 248 INC_SIZE(size); 249 250 if (compiler->saveds > 0 || compiler->scratches > 9) 251 POP_REG(reg_map[SLJIT_S0]); 252 if (compiler->saveds > 1 || compiler->scratches > 8) 253 POP_REG(reg_map[SLJIT_S1]); 254 if (compiler->saveds > 2 || compiler->scratches > 7) 255 POP_REG(reg_map[SLJIT_S2]); 256 POP_REG(reg_map[TMP_REG1]); 257 #if (defined SLJIT_X86_32_FASTCALL && SLJIT_X86_32_FASTCALL) 258 if (compiler->args > 2) 259 RET_I16(sizeof(sljit_sw)); 260 else 261 RET(); 262 #else 263 RET(); 264 #endif 265 266 return SLJIT_SUCCESS; 267 } 268 269 /* --------------------------------------------------------------------- */ 270 /* Operators */ 271 /* --------------------------------------------------------------------- */ 272 273 /* Size contains the flags as well. */ 274 static sljit_u8* emit_x86_instruction(struct sljit_compiler *compiler, sljit_s32 size, 275 /* The register or immediate operand. */ 276 sljit_s32 a, sljit_sw imma, 277 /* The general operand (not immediate). */ 278 sljit_s32 b, sljit_sw immb) 279 { 280 sljit_u8 *inst; 281 sljit_u8 *buf_ptr; 282 sljit_s32 flags = size & ~0xf; 283 sljit_s32 inst_size; 284 285 /* Both cannot be switched on. */ 286 SLJIT_ASSERT((flags & (EX86_BIN_INS | EX86_SHIFT_INS)) != (EX86_BIN_INS | EX86_SHIFT_INS)); 287 /* Size flags not allowed for typed instructions. */ 288 SLJIT_ASSERT(!(flags & (EX86_BIN_INS | EX86_SHIFT_INS)) || (flags & (EX86_BYTE_ARG | EX86_HALF_ARG)) == 0); 289 /* Both size flags cannot be switched on. */ 290 SLJIT_ASSERT((flags & (EX86_BYTE_ARG | EX86_HALF_ARG)) != (EX86_BYTE_ARG | EX86_HALF_ARG)); 291 /* SSE2 and immediate is not possible. */ 292 SLJIT_ASSERT(!(a & SLJIT_IMM) || !(flags & EX86_SSE2)); 293 SLJIT_ASSERT((flags & (EX86_PREF_F2 | EX86_PREF_F3)) != (EX86_PREF_F2 | EX86_PREF_F3) 294 && (flags & (EX86_PREF_F2 | EX86_PREF_66)) != (EX86_PREF_F2 | EX86_PREF_66) 295 && (flags & (EX86_PREF_F3 | EX86_PREF_66)) != (EX86_PREF_F3 | EX86_PREF_66)); 296 297 size &= 0xf; 298 inst_size = size; 299 300 if (flags & (EX86_PREF_F2 | EX86_PREF_F3)) 301 inst_size++; 302 if (flags & EX86_PREF_66) 303 inst_size++; 304 305 /* Calculate size of b. */ 306 inst_size += 1; /* mod r/m byte. */ 307 if (b & SLJIT_MEM) { 308 if ((b & REG_MASK) == SLJIT_UNUSED) 309 inst_size += sizeof(sljit_sw); 310 else if (immb != 0 && !(b & OFFS_REG_MASK)) { 311 /* Immediate operand. */ 312 if (immb <= 127 && immb >= -128) 313 inst_size += sizeof(sljit_s8); 314 else 315 inst_size += sizeof(sljit_sw); 316 } 317 318 if ((b & REG_MASK) == SLJIT_SP && !(b & OFFS_REG_MASK)) 319 b |= TO_OFFS_REG(SLJIT_SP); 320 321 if ((b & OFFS_REG_MASK) != SLJIT_UNUSED) 322 inst_size += 1; /* SIB byte. */ 323 } 324 325 /* Calculate size of a. */ 326 if (a & SLJIT_IMM) { 327 if (flags & EX86_BIN_INS) { 328 if (imma <= 127 && imma >= -128) { 329 inst_size += 1; 330 flags |= EX86_BYTE_ARG; 331 } else 332 inst_size += 4; 333 } 334 else if (flags & EX86_SHIFT_INS) { 335 imma &= 0x1f; 336 if (imma != 1) { 337 inst_size ++; 338 flags |= EX86_BYTE_ARG; 339 } 340 } else if (flags & EX86_BYTE_ARG) 341 inst_size++; 342 else if (flags & EX86_HALF_ARG) 343 inst_size += sizeof(short); 344 else 345 inst_size += sizeof(sljit_sw); 346 } 347 else 348 SLJIT_ASSERT(!(flags & EX86_SHIFT_INS) || a == SLJIT_PREF_SHIFT_REG); 349 350 inst = (sljit_u8*)ensure_buf(compiler, 1 + inst_size); 351 PTR_FAIL_IF(!inst); 352 353 /* Encoding the byte. */ 354 INC_SIZE(inst_size); 355 if (flags & EX86_PREF_F2) 356 *inst++ = 0xf2; 357 if (flags & EX86_PREF_F3) 358 *inst++ = 0xf3; 359 if (flags & EX86_PREF_66) 360 *inst++ = 0x66; 361 362 buf_ptr = inst + size; 363 364 /* Encode mod/rm byte. */ 365 if (!(flags & EX86_SHIFT_INS)) { 366 if ((flags & EX86_BIN_INS) && (a & SLJIT_IMM)) 367 *inst = (flags & EX86_BYTE_ARG) ? GROUP_BINARY_83 : GROUP_BINARY_81; 368 369 if ((a & SLJIT_IMM) || (a == 0)) 370 *buf_ptr = 0; 371 else if (!(flags & EX86_SSE2_OP1)) 372 *buf_ptr = reg_map[a] << 3; 373 else 374 *buf_ptr = a << 3; 375 } 376 else { 377 if (a & SLJIT_IMM) { 378 if (imma == 1) 379 *inst = GROUP_SHIFT_1; 380 else 381 *inst = GROUP_SHIFT_N; 382 } else 383 *inst = GROUP_SHIFT_CL; 384 *buf_ptr = 0; 385 } 386 387 if (!(b & SLJIT_MEM)) 388 *buf_ptr++ |= MOD_REG + ((!(flags & EX86_SSE2_OP2)) ? reg_map[b] : b); 389 else if ((b & REG_MASK) != SLJIT_UNUSED) { 390 if ((b & OFFS_REG_MASK) == SLJIT_UNUSED || (b & OFFS_REG_MASK) == TO_OFFS_REG(SLJIT_SP)) { 391 if (immb != 0) { 392 if (immb <= 127 && immb >= -128) 393 *buf_ptr |= 0x40; 394 else 395 *buf_ptr |= 0x80; 396 } 397 398 if ((b & OFFS_REG_MASK) == SLJIT_UNUSED) 399 *buf_ptr++ |= reg_map[b & REG_MASK]; 400 else { 401 *buf_ptr++ |= 0x04; 402 *buf_ptr++ = reg_map[b & REG_MASK] | (reg_map[OFFS_REG(b)] << 3); 403 } 404 405 if (immb != 0) { 406 if (immb <= 127 && immb >= -128) 407 *buf_ptr++ = immb; /* 8 bit displacement. */ 408 else { 409 sljit_unaligned_store_sw(buf_ptr, immb); /* 32 bit displacement. */ 410 buf_ptr += sizeof(sljit_sw); 411 } 412 } 413 } 414 else { 415 *buf_ptr++ |= 0x04; 416 *buf_ptr++ = reg_map[b & REG_MASK] | (reg_map[OFFS_REG(b)] << 3) | (immb << 6); 417 } 418 } 419 else { 420 *buf_ptr++ |= 0x05; 421 sljit_unaligned_store_sw(buf_ptr, immb); /* 32 bit displacement. */ 422 buf_ptr += sizeof(sljit_sw); 423 } 424 425 if (a & SLJIT_IMM) { 426 if (flags & EX86_BYTE_ARG) 427 *buf_ptr = imma; 428 else if (flags & EX86_HALF_ARG) 429 sljit_unaligned_store_s16(buf_ptr, imma); 430 else if (!(flags & EX86_SHIFT_INS)) 431 sljit_unaligned_store_sw(buf_ptr, imma); 432 } 433 434 return !(flags & EX86_SHIFT_INS) ? inst : (inst + 1); 435 } 436 437 /* --------------------------------------------------------------------- */ 438 /* Call / return instructions */ 439 /* --------------------------------------------------------------------- */ 440 441 static SLJIT_INLINE sljit_s32 call_with_args(struct sljit_compiler *compiler, sljit_s32 type) 442 { 443 sljit_u8 *inst; 444 445 #if (defined SLJIT_X86_32_FASTCALL && SLJIT_X86_32_FASTCALL) 446 inst = (sljit_u8*)ensure_buf(compiler, type >= SLJIT_CALL3 ? 1 + 2 + 1 : 1 + 2); 447 FAIL_IF(!inst); 448 INC_SIZE(type >= SLJIT_CALL3 ? 2 + 1 : 2); 449 450 if (type >= SLJIT_CALL3) 451 PUSH_REG(reg_map[SLJIT_R2]); 452 *inst++ = MOV_r_rm; 453 *inst++ = MOD_REG | (reg_map[SLJIT_R2] << 3) | reg_map[SLJIT_R0]; 454 #else 455 inst = (sljit_u8*)ensure_buf(compiler, 1 + 4 * (type - SLJIT_CALL0)); 456 FAIL_IF(!inst); 457 INC_SIZE(4 * (type - SLJIT_CALL0)); 458 459 *inst++ = MOV_rm_r; 460 *inst++ = MOD_DISP8 | (reg_map[SLJIT_R0] << 3) | 0x4 /* SIB */; 461 *inst++ = (0x4 /* none*/ << 3) | reg_map[SLJIT_SP]; 462 *inst++ = 0; 463 if (type >= SLJIT_CALL2) { 464 *inst++ = MOV_rm_r; 465 *inst++ = MOD_DISP8 | (reg_map[SLJIT_R1] << 3) | 0x4 /* SIB */; 466 *inst++ = (0x4 /* none*/ << 3) | reg_map[SLJIT_SP]; 467 *inst++ = sizeof(sljit_sw); 468 } 469 if (type >= SLJIT_CALL3) { 470 *inst++ = MOV_rm_r; 471 *inst++ = MOD_DISP8 | (reg_map[SLJIT_R2] << 3) | 0x4 /* SIB */; 472 *inst++ = (0x4 /* none*/ << 3) | reg_map[SLJIT_SP]; 473 *inst++ = 2 * sizeof(sljit_sw); 474 } 475 #endif 476 return SLJIT_SUCCESS; 477 } 478 479 SLJIT_API_FUNC_ATTRIBUTE sljit_s32 sljit_emit_fast_enter(struct sljit_compiler *compiler, sljit_s32 dst, sljit_sw dstw) 480 { 481 sljit_u8 *inst; 482 483 CHECK_ERROR(); 484 CHECK(check_sljit_emit_fast_enter(compiler, dst, dstw)); 485 ADJUST_LOCAL_OFFSET(dst, dstw); 486 487 CHECK_EXTRA_REGS(dst, dstw, (void)0); 488 489 /* For UNUSED dst. Uncommon, but possible. */ 490 if (dst == SLJIT_UNUSED) 491 dst = TMP_REG1; 492 493 if (FAST_IS_REG(dst)) { 494 /* Unused dest is possible here. */ 495 inst = (sljit_u8*)ensure_buf(compiler, 1 + 1); 496 FAIL_IF(!inst); 497 498 INC_SIZE(1); 499 POP_REG(reg_map[dst]); 500 return SLJIT_SUCCESS; 501 } 502 503 /* Memory. */ 504 inst = emit_x86_instruction(compiler, 1, 0, 0, dst, dstw); 505 FAIL_IF(!inst); 506 *inst++ = POP_rm; 507 return SLJIT_SUCCESS; 508 } 509 510 SLJIT_API_FUNC_ATTRIBUTE sljit_s32 sljit_emit_fast_return(struct sljit_compiler *compiler, sljit_s32 src, sljit_sw srcw) 511 { 512 sljit_u8 *inst; 513 514 CHECK_ERROR(); 515 CHECK(check_sljit_emit_fast_return(compiler, src, srcw)); 516 ADJUST_LOCAL_OFFSET(src, srcw); 517 518 CHECK_EXTRA_REGS(src, srcw, (void)0); 519 520 if (FAST_IS_REG(src)) { 521 inst = (sljit_u8*)ensure_buf(compiler, 1 + 1 + 1); 522 FAIL_IF(!inst); 523 524 INC_SIZE(1 + 1); 525 PUSH_REG(reg_map[src]); 526 } 527 else if (src & SLJIT_MEM) { 528 inst = emit_x86_instruction(compiler, 1, 0, 0, src, srcw); 529 FAIL_IF(!inst); 530 *inst++ = GROUP_FF; 531 *inst |= PUSH_rm; 532 533 inst = (sljit_u8*)ensure_buf(compiler, 1 + 1); 534 FAIL_IF(!inst); 535 INC_SIZE(1); 536 } 537 else { 538 /* SLJIT_IMM. */ 539 inst = (sljit_u8*)ensure_buf(compiler, 1 + 5 + 1); 540 FAIL_IF(!inst); 541 542 INC_SIZE(5 + 1); 543 *inst++ = PUSH_i32; 544 sljit_unaligned_store_sw(inst, srcw); 545 inst += sizeof(sljit_sw); 546 } 547 548 RET(); 549 return SLJIT_SUCCESS; 550 } 551
