1 /*
2 * Stack-less Just-In-Time compiler
3 *
4 * Copyright 2009-2012 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
emit_do_imm(struct sljit_compiler * compiler,sljit_ub opcode,sljit_sw imm)29 static sljit_si emit_do_imm(struct sljit_compiler *compiler, sljit_ub opcode, sljit_sw imm)
30 {
31 sljit_ub *inst;
32
33 inst = (sljit_ub*)ensure_buf(compiler, 1 + 1 + sizeof(sljit_sw));
34 FAIL_IF(!inst);
35 INC_SIZE(1 + sizeof(sljit_sw));
36 *inst++ = opcode;
37 *(sljit_sw*)inst = imm;
38 return SLJIT_SUCCESS;
39 }
40
generate_far_jump_code(struct sljit_jump * jump,sljit_ub * code_ptr,sljit_si type)41 static sljit_ub* generate_far_jump_code(struct sljit_jump *jump, sljit_ub *code_ptr, sljit_si 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_sw*)code_ptr = jump->u.target - (jump->addr + 4);
61 code_ptr += 4;
62
63 return code_ptr;
64 }
65
sljit_emit_enter(struct sljit_compiler * compiler,sljit_si options,sljit_si args,sljit_si scratches,sljit_si saveds,sljit_si fscratches,sljit_si fsaveds,sljit_si local_size)66 SLJIT_API_FUNC_ATTRIBUTE sljit_si sljit_emit_enter(struct sljit_compiler *compiler,
67 sljit_si options, sljit_si args, sljit_si scratches, sljit_si saveds,
68 sljit_si fscratches, sljit_si fsaveds, sljit_si local_size)
69 {
70 sljit_si size;
71 sljit_ub *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_ub*)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_ub*)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_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_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
sljit_set_context(struct sljit_compiler * compiler,sljit_si options,sljit_si args,sljit_si scratches,sljit_si saveds,sljit_si fscratches,sljit_si fsaveds,sljit_si local_size)186 SLJIT_API_FUNC_ATTRIBUTE sljit_si sljit_set_context(struct sljit_compiler *compiler,
187 sljit_si options, sljit_si args, sljit_si scratches, sljit_si saveds,
188 sljit_si fscratches, sljit_si fsaveds, sljit_si 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
sljit_emit_return(struct sljit_compiler * compiler,sljit_si op,sljit_si src,sljit_sw srcw)208 SLJIT_API_FUNC_ATTRIBUTE sljit_si sljit_emit_return(struct sljit_compiler *compiler, sljit_si op, sljit_si src, sljit_sw srcw)
209 {
210 sljit_si size;
211 sljit_ub *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_ub*)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_ub*)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. */
emit_x86_instruction(struct sljit_compiler * compiler,sljit_si size,sljit_si a,sljit_sw imma,sljit_si b,sljit_sw immb)274 static sljit_ub* emit_x86_instruction(struct sljit_compiler *compiler, sljit_si size,
275 /* The register or immediate operand. */
276 sljit_si a, sljit_sw imma,
277 /* The general operand (not immediate). */
278 sljit_si b, sljit_sw immb)
279 {
280 sljit_ub *inst;
281 sljit_ub *buf_ptr;
282 sljit_si flags = size & ~0xf;
283 sljit_si 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_sb);
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_ub*)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_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_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 *(short*)buf_ptr = imma;
430 else if (!(flags & EX86_SHIFT_INS))
431 *(sljit_sw*)buf_ptr = imma;
432 }
433
434 return !(flags & EX86_SHIFT_INS) ? inst : (inst + 1);
435 }
436
437 /* --------------------------------------------------------------------- */
438 /* Call / return instructions */
439 /* --------------------------------------------------------------------- */
440
call_with_args(struct sljit_compiler * compiler,sljit_si type)441 static SLJIT_INLINE sljit_si call_with_args(struct sljit_compiler *compiler, sljit_si type)
442 {
443 sljit_ub *inst;
444
445 #if (defined SLJIT_X86_32_FASTCALL && SLJIT_X86_32_FASTCALL)
446 inst = (sljit_ub*)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_ub*)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
sljit_emit_fast_enter(struct sljit_compiler * compiler,sljit_si dst,sljit_sw dstw)479 SLJIT_API_FUNC_ATTRIBUTE sljit_si sljit_emit_fast_enter(struct sljit_compiler *compiler, sljit_si dst, sljit_sw dstw)
480 {
481 sljit_ub *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_ub*)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
sljit_emit_fast_return(struct sljit_compiler * compiler,sljit_si src,sljit_sw srcw)510 SLJIT_API_FUNC_ATTRIBUTE sljit_si sljit_emit_fast_return(struct sljit_compiler *compiler, sljit_si src, sljit_sw srcw)
511 {
512 sljit_ub *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_ub*)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_ub*)ensure_buf(compiler, 1 + 1);
534 FAIL_IF(!inst);
535 INC_SIZE(1);
536 }
537 else {
538 /* SLJIT_IMM. */
539 inst = (sljit_ub*)ensure_buf(compiler, 1 + 5 + 1);
540 FAIL_IF(!inst);
541
542 INC_SIZE(5 + 1);
543 *inst++ = PUSH_i32;
544 *(sljit_sw*)inst = srcw;
545 inst += sizeof(sljit_sw);
546 }
547
548 RET();
549 return SLJIT_SUCCESS;
550 }
551
