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Contents of /code/trunk/sljit/sljitLir.h

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Revision 1493 - (show annotations) (download)
Wed Jul 9 04:41:15 2014 UTC (13 days, 17 hours ago) by zherczeg
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Minor JIT compiler update.
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 #ifndef _SLJIT_LIR_H_
28 #define _SLJIT_LIR_H_
29
30 /*
31 ------------------------------------------------------------------------
32 Stack-Less JIT compiler for multiple architectures (x86, ARM, PowerPC)
33 ------------------------------------------------------------------------
34
35 Short description
36 Advantages:
37 - The execution can be continued from any LIR instruction. In other
38 words, it is possible to jump to any label from anywhere, even from
39 a code fragment, which is compiled later, if both compiled code
40 shares the same context. See sljit_emit_enter for more details
41 - Supports self modifying code: target of (conditional) jump and call
42 instructions and some constant values can be dynamically modified
43 during runtime
44 - although it is not suggested to do it frequently
45 - can be used for inline caching: save an important value once
46 in the instruction stream
47 - since this feature limits the optimization possibilities, a
48 special flag must be passed at compile time when these
49 instructions are emitted
50 - A fixed stack space can be allocated for local variables
51 - The compiler is thread-safe
52 - The compiler is highly configurable through preprocessor macros.
53 You can disable unneeded features (multithreading in single
54 threaded applications), and you can use your own system functions
55 (including memory allocators). See sljitConfig.h
56 Disadvantages:
57 - No automatic register allocation, and temporary results are
58 not stored on the stack. (hence the name comes)
59 In practice:
60 - This approach is very effective for interpreters
61 - One of the saved registers typically points to a stack interface
62 - It can jump to any exception handler anytime (even if it belongs
63 to another function)
64 - Hot paths can be modified during runtime reflecting the changes
65 of the fastest execution path of the dynamic language
66 - SLJIT supports complex memory addressing modes
67 - mainly position and context independent code (except some cases)
68
69 For valgrind users:
70 - pass --smc-check=all argument to valgrind, since JIT is a "self-modifying code"
71 */
72
73 #if !(defined SLJIT_NO_DEFAULT_CONFIG && SLJIT_NO_DEFAULT_CONFIG)
74 #include "sljitConfig.h"
75 #endif
76
77 /* The following header file defines useful macros for fine tuning
78 sljit based code generators. They are listed in the beginning
79 of sljitConfigInternal.h */
80
81 #include "sljitConfigInternal.h"
82
83 /* --------------------------------------------------------------------- */
84 /* Error codes */
85 /* --------------------------------------------------------------------- */
86
87 /* Indicates no error. */
88 #define SLJIT_SUCCESS 0
89 /* After the call of sljit_generate_code(), the error code of the compiler
90 is set to this value to avoid future sljit calls (in debug mode at least).
91 The complier should be freed after sljit_generate_code(). */
92 #define SLJIT_ERR_COMPILED 1
93 /* Cannot allocate non executable memory. */
94 #define SLJIT_ERR_ALLOC_FAILED 2
95 /* Cannot allocate executable memory.
96 Only for sljit_generate_code() */
97 #define SLJIT_ERR_EX_ALLOC_FAILED 3
98 /* return value for SLJIT_CONFIG_UNSUPPORTED empty architecture. */
99 #define SLJIT_ERR_UNSUPPORTED 4
100
101 /* --------------------------------------------------------------------- */
102 /* Registers */
103 /* --------------------------------------------------------------------- */
104
105 /*
106 Scratch (R) registers: registers whose may not preserve their values
107 across function calls.
108
109 Saved (S) registers: registers whose preserve their values across
110 function calls.
111
112 The scratch and saved register sets are overlap. The last scratch register
113 is the first saved register, the one before the last is the second saved
114 register, and so on.
115
116 If an architecture provides two scratch and three saved registers,
117 its scratch and saved register sets are the following:
118
119 R0 | [S4] | R0 and S4 represent the same physical register
120 R1 | [S3] | R1 and S3 represent the same physical register
121 [R2] | S2 | R2 and S2 represent the same physical register
122 [R3] | S1 | R3 and S1 represent the same physical register
123 [R4] | S0 | R4 and S0 represent the same physical register
124
125 Note: SLJIT_NUMBER_OF_SCRATCH_REGISTERS would be 2 and
126 SLJIT_NUMBER_OF_SAVED_REGISTERS would be 3 for this architecture.
127
128 Note: On all supported architectures SLJIT_NUMBER_OF_REGISTERS >= 10
129 and SLJIT_NUMBER_OF_SAVED_REGISTERS >= 5. However, 4 registers
130 are virtual on x86-32. See below.
131
132 The purpose of this definition is convenience. Although a register
133 is either scratch register or saved register, SLJIT allows accessing
134 them from the other set. For example, four registers can be used as
135 scratch registers and the fifth one as saved register on the architecture
136 above. Of course the last two scratch registers (R2 and R3) from this
137 four will be saved on the stack, because they are defined as saved
138 registers in the application binary interface. Still R2 and R3 can be
139 used for referencing to these registers instead of S2 and S1, which
140 makes easier to write platform independent code. Scratch registers
141 can be saved registers in a similar way, but these extra saved
142 registers will not be preserved across function calls! Hence the
143 application must save them on those platforms, where the number of
144 saved registers is too low. This can be done by copy them onto
145 the stack and restore them after a function call.
146
147 Note: To emphasize that registers assigned to R2-R4 are saved
148 registers, they are enclosed by square brackets. S3-S4
149 are marked in a similar way.
150
151 Note: sljit_emit_enter and sljit_set_context defines whether a register
152 is S or R register. E.g: when 3 scratches and 1 saved is mapped
153 by sljit_emit_enter, the allowed register set will be: R0-R2 and
154 S0. Although S2 is mapped to the same position as R2, it does not
155 available in the current configuration. Furthermore the R3 (S1)
156 register does not available as well.
157 */
158
159 /* When SLJIT_UNUSED is specified as destination, the result is discarded. */
160 #define SLJIT_UNUSED 0
161
162 /* Scratch registers. */
163 #define SLJIT_R0 1
164 #define SLJIT_R1 2
165 #define SLJIT_R2 3
166 /* Note: on x86-32, R3 - R6 (same as S3 - S6) are emulated (they
167 are allocated on the stack). These registers are called virtual
168 and cannot be used for memory addressing (cannot be part of
169 any SLJIT_MEM1, SLJIT_MEM2 construct). There is no such
170 limitation on other CPUs. See sljit_get_register_index(). */
171 #define SLJIT_R3 4
172 #define SLJIT_R4 5
173 #define SLJIT_R5 6
174 #define SLJIT_R6 7
175 #define SLJIT_R7 8
176 #define SLJIT_R8 9
177 #define SLJIT_R9 10
178 /* All R registers provided by the architecture can be accessed by SLJIT_R(i)
179 The i parameter must be >= 0 and < SLJIT_NUMBER_OF_REGISTERS. */
180 #define SLJIT_R(i) (1 + (i))
181
182 /* Saved registers. */
183 #define SLJIT_S0 (SLJIT_NUMBER_OF_REGISTERS)
184 #define SLJIT_S1 (SLJIT_NUMBER_OF_REGISTERS - 1)
185 #define SLJIT_S2 (SLJIT_NUMBER_OF_REGISTERS - 2)
186 /* Note: on x86-32, S3 - S6 (same as R3 - R6) are emulated (they
187 are allocated on the stack). These registers are called virtual
188 and cannot be used for memory addressing (cannot be part of
189 any SLJIT_MEM1, SLJIT_MEM2 construct). There is no such
190 limitation on other CPUs. See sljit_get_register_index(). */
191 #define SLJIT_S3 (SLJIT_NUMBER_OF_REGISTERS - 3)
192 #define SLJIT_S4 (SLJIT_NUMBER_OF_REGISTERS - 4)
193 #define SLJIT_S5 (SLJIT_NUMBER_OF_REGISTERS - 5)
194 #define SLJIT_S6 (SLJIT_NUMBER_OF_REGISTERS - 6)
195 #define SLJIT_S7 (SLJIT_NUMBER_OF_REGISTERS - 7)
196 #define SLJIT_S8 (SLJIT_NUMBER_OF_REGISTERS - 8)
197 #define SLJIT_S9 (SLJIT_NUMBER_OF_REGISTERS - 9)
198 /* All S registers provided by the architecture can be accessed by SLJIT_S(i)
199 The i parameter must be >= 0 and < SLJIT_NUMBER_OF_SAVED_REGISTERS. */
200 #define SLJIT_S(i) (SLJIT_NUMBER_OF_REGISTERS - (i))
201
202 /* Registers >= SLJIT_FIRST_SAVED_REG are saved registers. */
203 #define SLJIT_FIRST_SAVED_REG (SLJIT_S0 - SLJIT_NUMBER_OF_SAVED_REGISTERS + 1)
204
205 /* The SLJIT_SP provides direct access to the linear stack space allocated by
206 sljit_emit_enter. It can only be used in the following form: SLJIT_MEM1(SLJIT_SP).
207 The immediate offset is extended by the relative stack offset automatically.
208 The sljit_get_local_base can be used to obtain the absolute offset. */
209 #define SLJIT_SP (SLJIT_NUMBER_OF_REGISTERS + 1)
210
211 /* Return with machine word. */
212
213 #define SLJIT_RETURN_REG SLJIT_R0
214
215 /* x86 prefers specific registers for special purposes. In case of shift
216 by register it supports only SLJIT_R2 for shift argument
217 (which is the src2 argument of sljit_emit_op2). If another register is
218 used, sljit must exchange data between registers which cause a minor
219 slowdown. Other architectures has no such limitation. */
220
221 #define SLJIT_PREF_SHIFT_REG SLJIT_R2
222
223 /* --------------------------------------------------------------------- */
224 /* Floating point registers */
225 /* --------------------------------------------------------------------- */
226
227 /* Each floating point register can store a double or single precision
228 value. The FR and FS register sets are overlap in the same way as R
229 and S register sets. See above. */
230
231 /* Note: SLJIT_UNUSED as destination is not valid for floating point
232 operations, since they cannot be used for setting flags. */
233
234 /* Floating point scratch registers. */
235 #define SLJIT_FR0 1
236 #define SLJIT_FR1 2
237 #define SLJIT_FR2 3
238 #define SLJIT_FR3 4
239 #define SLJIT_FR4 5
240 #define SLJIT_FR5 6
241 /* All FR registers provided by the architecture can be accessed by SLJIT_FR(i)
242 The i parameter must be >= 0 and < SLJIT_NUMBER_OF_FLOAT_REGISTERS. */
243 #define SLJIT_FR(i) (1 + (i))
244
245 /* Floating point saved registers. */
246 #define SLJIT_FS0 (SLJIT_NUMBER_OF_FLOAT_REGISTERS)
247 #define SLJIT_FS1 (SLJIT_NUMBER_OF_FLOAT_REGISTERS - 1)
248 #define SLJIT_FS2 (SLJIT_NUMBER_OF_FLOAT_REGISTERS - 2)
249 #define SLJIT_FS3 (SLJIT_NUMBER_OF_FLOAT_REGISTERS - 3)
250 #define SLJIT_FS4 (SLJIT_NUMBER_OF_FLOAT_REGISTERS - 4)
251 #define SLJIT_FS5 (SLJIT_NUMBER_OF_FLOAT_REGISTERS - 5)
252 /* All S registers provided by the architecture can be accessed by SLJIT_FS(i)
253 The i parameter must be >= 0 and < SLJIT_NUMBER_OF_SAVED_FLOAT_REGISTERS. */
254 #define SLJIT_FS(i) (SLJIT_NUMBER_OF_FLOAT_REGISTERS - (i))
255
256 /* Float registers >= SLJIT_FIRST_SAVED_FLOAT_REG are saved registers. */
257 #define SLJIT_FIRST_SAVED_FLOAT_REG (SLJIT_FS0 - SLJIT_NUMBER_OF_SAVED_FLOAT_REGISTERS + 1)
258
259 /* --------------------------------------------------------------------- */
260 /* Main structures and functions */
261 /* --------------------------------------------------------------------- */
262
263 struct sljit_memory_fragment {
264 struct sljit_memory_fragment *next;
265 sljit_uw used_size;
266 /* Must be aligned to sljit_sw. */
267 sljit_ub memory[1];
268 };
269
270 struct sljit_label {
271 struct sljit_label *next;
272 sljit_uw addr;
273 /* The maximum size difference. */
274 sljit_uw size;
275 };
276
277 struct sljit_jump {
278 struct sljit_jump *next;
279 sljit_uw addr;
280 sljit_sw flags;
281 union {
282 sljit_uw target;
283 struct sljit_label* label;
284 } u;
285 };
286
287 struct sljit_const {
288 struct sljit_const *next;
289 sljit_uw addr;
290 };
291
292 struct sljit_compiler {
293 sljit_si error;
294
295 struct sljit_label *labels;
296 struct sljit_jump *jumps;
297 struct sljit_const *consts;
298 struct sljit_label *last_label;
299 struct sljit_jump *last_jump;
300 struct sljit_const *last_const;
301
302 struct sljit_memory_fragment *buf;
303 struct sljit_memory_fragment *abuf;
304
305 /* Used scratch registers. */
306 sljit_si scratches;
307 /* Used saved registers. */
308 sljit_si saveds;
309 /* Used float scratch registers. */
310 sljit_si fscratches;
311 /* Used float saved registers. */
312 sljit_si fsaveds;
313 /* Local stack size. */
314 sljit_si local_size;
315 /* Code size. */
316 sljit_uw size;
317 /* For statistical purposes. */
318 sljit_uw executable_size;
319
320 #if (defined SLJIT_CONFIG_X86_32 && SLJIT_CONFIG_X86_32)
321 sljit_si args;
322 #endif
323
324 #if (defined SLJIT_CONFIG_X86_64 && SLJIT_CONFIG_X86_64)
325 sljit_si mode32;
326 #endif
327
328 #if (defined SLJIT_CONFIG_X86 && SLJIT_CONFIG_X86)
329 sljit_si flags_saved;
330 #endif
331
332 #if (defined SLJIT_CONFIG_ARM_V5 && SLJIT_CONFIG_ARM_V5)
333 /* Constant pool handling. */
334 sljit_uw *cpool;
335 sljit_ub *cpool_unique;
336 sljit_uw cpool_diff;
337 sljit_uw cpool_fill;
338 /* Other members. */
339 /* Contains pointer, "ldr pc, [...]" pairs. */
340 sljit_uw patches;
341 #endif
342
343 #if (defined SLJIT_CONFIG_ARM_V5 && SLJIT_CONFIG_ARM_V5) || (defined SLJIT_CONFIG_ARM_V7 && SLJIT_CONFIG_ARM_V7)
344 /* Temporary fields. */
345 sljit_uw shift_imm;
346 sljit_si cache_arg;
347 sljit_sw cache_argw;
348 #endif
349
350 #if (defined SLJIT_CONFIG_ARM_THUMB2 && SLJIT_CONFIG_ARM_THUMB2)
351 sljit_si cache_arg;
352 sljit_sw cache_argw;
353 #endif
354
355 #if (defined SLJIT_CONFIG_ARM_64 && SLJIT_CONFIG_ARM_64)
356 sljit_si locals_offset;
357 sljit_si cache_arg;
358 sljit_sw cache_argw;
359 #endif
360
361 #if (defined SLJIT_CONFIG_PPC && SLJIT_CONFIG_PPC)
362 sljit_sw imm;
363 sljit_si cache_arg;
364 sljit_sw cache_argw;
365 #endif
366
367 #if (defined SLJIT_CONFIG_MIPS && SLJIT_CONFIG_MIPS)
368 sljit_si delay_slot;
369 sljit_si cache_arg;
370 sljit_sw cache_argw;
371 #endif
372
373 #if (defined SLJIT_CONFIG_SPARC_32 && SLJIT_CONFIG_SPARC_32)
374 sljit_si delay_slot;
375 sljit_si cache_arg;
376 sljit_sw cache_argw;
377 #endif
378
379 #if (defined SLJIT_CONFIG_TILEGX && SLJIT_CONFIG_TILEGX)
380 sljit_si cache_arg;
381 sljit_sw cache_argw;
382 #endif
383
384 #if (defined SLJIT_VERBOSE && SLJIT_VERBOSE)
385 FILE* verbose;
386 #endif
387
388 #if (defined SLJIT_DEBUG && SLJIT_DEBUG)
389 /* Local size passed to the functions. */
390 sljit_si logical_local_size;
391 #endif
392
393 #if (defined SLJIT_VERBOSE && SLJIT_VERBOSE) || (defined SLJIT_DEBUG && SLJIT_DEBUG)
394 sljit_si skip_checks;
395 #endif
396 };
397
398 /* --------------------------------------------------------------------- */
399 /* Main functions */
400 /* --------------------------------------------------------------------- */
401
402 /* Creates an sljit compiler.
403 Returns NULL if failed. */
404 SLJIT_API_FUNC_ATTRIBUTE struct sljit_compiler* sljit_create_compiler(void);
405
406 /* Free everything except the compiled machine code. */
407 SLJIT_API_FUNC_ATTRIBUTE void sljit_free_compiler(struct sljit_compiler *compiler);
408
409 /* Returns the current error code. If an error is occurred, future sljit
410 calls which uses the same compiler argument returns early with the same
411 error code. Thus there is no need for checking the error after every
412 call, it is enough to do it before the code is compiled. Removing
413 these checks increases the performance of the compiling process. */
414 static SLJIT_INLINE sljit_si sljit_get_compiler_error(struct sljit_compiler *compiler) { return compiler->error; }
415
416 /*
417 Allocate a small amount of memory. The size must be <= 64 bytes on 32 bit,
418 and <= 128 bytes on 64 bit architectures. The memory area is owned by the
419 compiler, and freed by sljit_free_compiler. The returned pointer is
420 sizeof(sljit_sw) aligned. Excellent for allocating small blocks during
421 the compiling, and no need to worry about freeing them. The size is
422 enough to contain at most 16 pointers. If the size is outside of the range,
423 the function will return with NULL. However, this return value does not
424 indicate that there is no more memory (does not set the current error code
425 of the compiler to out-of-memory status).
426 */
427 SLJIT_API_FUNC_ATTRIBUTE void* sljit_alloc_memory(struct sljit_compiler *compiler, sljit_si size);
428
429 #if (defined SLJIT_VERBOSE && SLJIT_VERBOSE)
430 /* Passing NULL disables verbose. */
431 SLJIT_API_FUNC_ATTRIBUTE void sljit_compiler_verbose(struct sljit_compiler *compiler, FILE* verbose);
432 #endif
433
434 SLJIT_API_FUNC_ATTRIBUTE void* sljit_generate_code(struct sljit_compiler *compiler);
435 SLJIT_API_FUNC_ATTRIBUTE void sljit_free_code(void* code);
436
437 /*
438 After the machine code generation is finished we can retrieve the allocated
439 executable memory size, although this area may not be fully filled with
440 instructions depending on some optimizations. This function is useful only
441 for statistical purposes.
442
443 Before a successful code generation, this function returns with 0.
444 */
445 static SLJIT_INLINE sljit_uw sljit_get_generated_code_size(struct sljit_compiler *compiler) { return compiler->executable_size; }
446
447 /* Instruction generation. Returns with any error code. If there is no
448 error, they return with SLJIT_SUCCESS. */
449
450 /*
451 The executable code is a function call from the viewpoint of the C
452 language. The function calls must obey to the ABI (Application
453 Binary Interface) of the platform, which specify the purpose of
454 all machine registers and stack handling among other things. The
455 sljit_emit_enter function emits the necessary instructions for
456 setting up a new context for the executable code and moves function
457 arguments to the saved registers. The number of sljit_sw arguments
458 passed to the function are specified in the "args" parameter. The
459 number of arguments must be less than or equal to 3. The first
460 argument goes to SLJIT_S0, the second goes to SLJIT_S1 and so on.
461 The register set used by the function must be declared as well.
462 The number of scratch and saved registers used by the function must
463 be passed to sljit_emit_enter. Only R registers between R0 and
464 "scratches" argument can be used later. E.g. if "scratches" is set
465 to 2, the register set will be limited to R0 and R1. The S registers
466 and the floating point registers ("fscratches" and "fsaveds")
467 are specified in a similar way. The sljit_emit_enter is also capable
468 of allocating a stack space for local variables. The "local_size"
469 argument contains the size in bytes of this local area and its
470 staring address is stored in SLJIT_SP. The memory area between
471 SLJIT_SP (inclusive) and SLJIT_SP + local_size (exclusive) can be
472 modified freely until the function returns. The stack space is not
473 initialized.
474
475 Note: the following conditions must met:
476 0 <= scratches <= SLJIT_NUMBER_OF_REGISTERS
477 0 <= saveds <= SLJIT_NUMBER_OF_REGISTERS
478 scratches + saveds <= SLJIT_NUMBER_OF_REGISTERS
479 0 <= fscratches <= SLJIT_NUMBER_OF_FLOAT_REGISTERS
480 0 <= fsaveds <= SLJIT_NUMBER_OF_FLOAT_REGISTERS
481 fscratches + fsaveds <= SLJIT_NUMBER_OF_FLOAT_REGISTERS
482
483 Note: every call of sljit_emit_enter and sljit_set_context
484 overwrites the previous context.
485 */
486
487 #define SLJIT_MAX_LOCAL_SIZE 65536
488
489 SLJIT_API_FUNC_ATTRIBUTE sljit_si sljit_emit_enter(struct sljit_compiler *compiler,
490 sljit_si args, sljit_si scratches, sljit_si saveds,
491 sljit_si fscratches, sljit_si fsaveds, sljit_si local_size);
492
493 /* The machine code has a context (which contains the local stack space size,
494 number of used registers, etc.) which initialized by sljit_emit_enter. Several
495 functions (like sljit_emit_return) requres this context to be able to generate
496 the appropriate code. However, some code fragments (like inline cache) may have
497 no normal entry point so their context is unknown for the compiler. Their context
498 can be provided to the compiler by the sljit_set_context function.
499
500 Note: every call of sljit_emit_enter and sljit_set_context overwrites
501 the previous context. */
502
503 SLJIT_API_FUNC_ATTRIBUTE void sljit_set_context(struct sljit_compiler *compiler,
504 sljit_si args, sljit_si scratches, sljit_si saveds,
505 sljit_si fscratches, sljit_si fsaveds, sljit_si local_size);
506
507 /* Return from machine code. The op argument can be SLJIT_UNUSED which means the
508 function does not return with anything or any opcode between SLJIT_MOV and
509 SLJIT_MOV_P (see sljit_emit_op1). As for src and srcw they must be 0 if op
510 is SLJIT_UNUSED, otherwise see below the description about source and
511 destination arguments. */
512
513 SLJIT_API_FUNC_ATTRIBUTE sljit_si sljit_emit_return(struct sljit_compiler *compiler, sljit_si op,
514 sljit_si src, sljit_sw srcw);
515
516 /* Fast calling mechanism for utility functions (see SLJIT_FAST_CALL). All registers and
517 even the stack frame is passed to the callee. The return address is preserved in
518 dst/dstw by sljit_emit_fast_enter (the type of the value stored by this function
519 is sljit_p), and sljit_emit_fast_return can use this as a return value later. */
520
521 /* Note: only for sljit specific, non ABI compilant calls. Fast, since only a few machine
522 instructions are needed. Excellent for small uility functions, where saving registers
523 and setting up a new stack frame would cost too much performance. However, it is still
524 possible to return to the address of the caller (or anywhere else). */
525
526 /* Note: flags are not changed (unlike sljit_emit_enter / sljit_emit_return). */
527
528 /* Note: although sljit_emit_fast_return could be replaced by an ijump, it is not suggested,
529 since many architectures do clever branch prediction on call / return instruction pairs. */
530
531 SLJIT_API_FUNC_ATTRIBUTE sljit_si sljit_emit_fast_enter(struct sljit_compiler *compiler, sljit_si dst, sljit_sw dstw);
532 SLJIT_API_FUNC_ATTRIBUTE sljit_si sljit_emit_fast_return(struct sljit_compiler *compiler, sljit_si src, sljit_sw srcw);
533
534 /*
535 Source and destination values for arithmetical instructions
536 imm - a simple immediate value (cannot be used as a destination)
537 reg - any of the registers (immediate argument must be 0)
538 [imm] - absolute immediate memory address
539 [reg+imm] - indirect memory address
540 [reg+(reg<<imm)] - indirect indexed memory address (shift must be between 0 and 3)
541 useful for (byte, half, int, sljit_sw) array access
542 (fully supported by both x86 and ARM architectures, and cheap operation on others)
543 */
544
545 /*
546 IMPORATNT NOTE: memory access MUST be naturally aligned except
547 SLJIT_UNALIGNED macro is defined and its value is 1.
548
549 length | alignment
550 ---------+-----------
551 byte | 1 byte (any physical_address is accepted)
552 half | 2 byte (physical_address & 0x1 == 0)
553 int | 4 byte (physical_address & 0x3 == 0)
554 word | 4 byte if SLJIT_32BIT_ARCHITECTURE is defined and its value is 1
555 | 8 byte if SLJIT_64BIT_ARCHITECTURE is defined and its value is 1
556 pointer | size of sljit_p type (4 byte on 32 bit machines, 4 or 8 byte
557 | on 64 bit machines)
558
559 Note: Different architectures have different addressing limitations.
560 A single instruction is enough for the following addressing
561 modes. Other adrressing modes are emulated by instruction
562 sequences. This information could help to improve those code
563 generators which focuses only a few architectures.
564
565 x86: [reg+imm], -2^32+1 <= imm <= 2^32-1 (full address space on x86-32)
566 [reg+(reg<<imm)] is supported
567 [imm], -2^32+1 <= imm <= 2^32-1 is supported
568 Write-back is not supported
569 arm: [reg+imm], -4095 <= imm <= 4095 or -255 <= imm <= 255 for signed
570 bytes, any halfs or floating point values)
571 [reg+(reg<<imm)] is supported
572 Write-back is supported
573 arm-t2: [reg+imm], -255 <= imm <= 4095
574 [reg+(reg<<imm)] is supported
575 Write back is supported only for [reg+imm], where -255 <= imm <= 255
576 ppc: [reg+imm], -65536 <= imm <= 65535. 64 bit loads/stores and 32 bit
577 signed load on 64 bit requires immediates divisible by 4.
578 [reg+imm] is not supported for signed 8 bit values.
579 [reg+reg] is supported
580 Write-back is supported except for one instruction: 32 bit signed
581 load with [reg+imm] addressing mode on 64 bit.
582 mips: [reg+imm], -65536 <= imm <= 65535
583 sparc: [reg+imm], -4096 <= imm <= 4095
584 [reg+reg] is supported
585 */
586
587 /* Register output: simply the name of the register.
588 For destination, you can use SLJIT_UNUSED as well. */
589 #define SLJIT_MEM 0x80
590 #define SLJIT_MEM0() (SLJIT_MEM)
591 #define SLJIT_MEM1(r1) (SLJIT_MEM | (r1))
592 #define SLJIT_MEM2(r1, r2) (SLJIT_MEM | (r1) | ((r2) << 8))
593 #define SLJIT_IMM 0x40
594
595 /* Set 32 bit operation mode (I) on 64 bit CPUs. The flag is totally ignored on
596 32 bit CPUs. If this flag is set for an arithmetic operation, it uses only the
597 lower 32 bit of the input register(s), and set the CPU status flags according
598 to the 32 bit result. The higher 32 bits are undefined for both the input and
599 output. However, the CPU might not ignore those higher 32 bits, like MIPS, which
600 expects it to be the sign extension of the lower 32 bit. All 32 bit operations
601 are undefined, if this condition is not fulfilled. Therefore, when SLJIT_INT_OP
602 is specified, all register arguments must be the result of other operations with
603 the same SLJIT_INT_OP flag. In other words, although a register can hold either
604 a 64 or 32 bit value, these values cannot be mixed. The only exceptions are
605 SLJIT_IMOV and SLJIT_IMOVU (SLJIT_MOV_SI/SLJIT_MOVU_SI with SLJIT_INT_OP flag)
606 which can convert any source argument to SLJIT_INT_OP compatible result. This
607 conversion might be unnecessary on some CPUs like x86-64, since the upper 32
608 bit is always ignored. In this case SLJIT is clever enough to not generate any
609 instructions if the source and destination operands are the same registers.
610 Affects sljit_emit_op0, sljit_emit_op1 and sljit_emit_op2. */
611 #define SLJIT_INT_OP 0x100
612
613 /* Single precision mode (SP). This flag is similar to SLJIT_INT_OP, just
614 it applies to floating point registers (it is even the same bit). When
615 this flag is passed, the CPU performs single precision floating point
616 operations. Similar to SLJIT_INT_OP, all register arguments must be the
617 result of other floating point operations with this flag. Affects
618 sljit_emit_fop1, sljit_emit_fop2 and sljit_emit_fcmp. */
619 #define SLJIT_SINGLE_OP 0x100
620
621 /* Common CPU status flags for all architectures (x86, ARM, PPC)
622 - carry flag
623 - overflow flag
624 - zero flag
625 - negative/positive flag (depends on arc)
626 On mips, these flags are emulated by software. */
627
628 /* By default, the instructions may, or may not set the CPU status flags.
629 Forcing to set or keep status flags can be done with the following flags: */
630
631 /* Note: sljit tries to emit the minimum number of instructions. Using these
632 flags can increase them, so use them wisely to avoid unnecessary code generation. */
633
634 /* Set Equal (Zero) status flag (E). */
635 #define SLJIT_SET_E 0x0200
636 /* Set unsigned status flag (U). */
637 #define SLJIT_SET_U 0x0400
638 /* Set signed status flag (S). */
639 #define SLJIT_SET_S 0x0800
640 /* Set signed overflow flag (O). */
641 #define SLJIT_SET_O 0x1000
642 /* Set carry flag (C).
643 Note: Kinda unsigned overflow, but behaves differently on various cpus. */
644 #define SLJIT_SET_C 0x2000
645 /* Do not modify the flags (K).
646 Note: This flag cannot be combined with any other SLJIT_SET_* flag. */
647 #define SLJIT_KEEP_FLAGS 0x4000
648
649 /* Notes:
650 - you cannot postpone conditional jump instructions except if noted that
651 the instruction does not set flags (See: SLJIT_KEEP_FLAGS).
652 - flag combinations: '|' means 'logical or'. */
653
654 /* Flags: - (never set any flags)
655 Note: breakpoint instruction is not supported by all architectures (namely ppc)
656 It falls back to SLJIT_NOP in those cases. */
657 #define SLJIT_BREAKPOINT 0
658 /* Flags: - (never set any flags)
659 Note: may or may not cause an extra cycle wait
660 it can even decrease the runtime in a few cases. */
661 #define SLJIT_NOP 1
662 /* Flags: - (may destroy flags)
663 Unsigned multiplication of SLJIT_R0 and SLJIT_R1.
664 Result goes to SLJIT_R1:SLJIT_R0 (high:low) word */
665 #define SLJIT_UMUL 2
666 /* Flags: - (may destroy flags)
667 Signed multiplication of SLJIT_R0 and SLJIT_R1.
668 Result goes to SLJIT_R1:SLJIT_R0 (high:low) word */
669 #define SLJIT_SMUL 3
670 /* Flags: I - (may destroy flags)
671 Unsigned divide of the value in SLJIT_R0 by the value in SLJIT_R1.
672 The result is placed in SLJIT_R0 and the remainder goes to SLJIT_R1.
673 Note: if SLJIT_R1 contains 0, the behaviour is undefined. */
674 #define SLJIT_UDIV 4
675 #define SLJIT_IUDIV (SLJIT_UDIV | SLJIT_INT_OP)
676 /* Flags: I - (may destroy flags)
677 Signed divide of the value in SLJIT_R0 by the value in SLJIT_R1.
678 The result is placed in SLJIT_R0 and the remainder goes to SLJIT_R1.
679 Note: if SLJIT_R1 contains 0, the behaviour is undefined. */
680 #define SLJIT_SDIV 5
681 #define SLJIT_ISDIV (SLJIT_SDIV | SLJIT_INT_OP)
682
683 SLJIT_API_FUNC_ATTRIBUTE sljit_si sljit_emit_op0(struct sljit_compiler *compiler, sljit_si op);
684
685 /* Notes for MOV instructions:
686 U = Mov with update (pre form). If source or destination defined as SLJIT_MEM1(r1)
687 or SLJIT_MEM2(r1, r2), r1 is increased by the sum of r2 and the constant argument
688 UB = unsigned byte (8 bit)
689 SB = signed byte (8 bit)
690 UH = unsigned half (16 bit)
691 SH = signed half (16 bit)
692 UI = unsigned int (32 bit)
693 SI = signed int (32 bit)
694 P = pointer (sljit_p) size */
695
696 /* Flags: - (never set any flags) */
697 #define SLJIT_MOV 6
698 /* Flags: I - (never set any flags) */
699 #define SLJIT_MOV_UB 7
700 #define SLJIT_IMOV_UB (SLJIT_MOV_UB | SLJIT_INT_OP)
701 /* Flags: I - (never set any flags) */
702 #define SLJIT_MOV_SB 8
703 #define SLJIT_IMOV_SB (SLJIT_MOV_SB | SLJIT_INT_OP)
704 /* Flags: I - (never set any flags) */
705 #define SLJIT_MOV_UH 9
706 #define SLJIT_IMOV_UH (SLJIT_MOV_UH | SLJIT_INT_OP)
707 /* Flags: I - (never set any flags) */
708 #define SLJIT_MOV_SH 10
709 #define SLJIT_IMOV_SH (SLJIT_MOV_SH | SLJIT_INT_OP)
710 /* Flags: I - (never set any flags)
711 Note: see SLJIT_INT_OP for further details. */
712 #define SLJIT_MOV_UI 11
713 /* No SLJIT_INT_OP form, since it is the same as SLJIT_IMOV. */
714 /* Flags: I - (never set any flags)
715 Note: see SLJIT_INT_OP for further details. */
716 #define SLJIT_MOV_SI 12
717 #define SLJIT_IMOV (SLJIT_MOV_SI | SLJIT_INT_OP)
718 /* Flags: - (never set any flags) */
719 #define SLJIT_MOV_P 13
720 /* Flags: - (never set any flags) */
721 #define SLJIT_MOVU 14
722 /* Flags: I - (never set any flags) */
723 #define SLJIT_MOVU_UB 15
724 #define SLJIT_IMOVU_UB (SLJIT_MOVU_UB | SLJIT_INT_OP)
725 /* Flags: I - (never set any flags) */
726 #define SLJIT_MOVU_SB 16
727 #define SLJIT_IMOVU_SB (SLJIT_MOVU_SB | SLJIT_INT_OP)
728 /* Flags: I - (never set any flags) */
729 #define SLJIT_MOVU_UH 17
730 #define SLJIT_IMOVU_UH (SLJIT_MOVU_UH | SLJIT_INT_OP)
731 /* Flags: I - (never set any flags) */
732 #define SLJIT_MOVU_SH 18
733 #define SLJIT_IMOVU_SH (SLJIT_MOVU_SH | SLJIT_INT_OP)
734 /* Flags: I - (never set any flags)
735 Note: see SLJIT_INT_OP for further details. */
736 #define SLJIT_MOVU_UI 19
737 /* No SLJIT_INT_OP form, since it is the same as SLJIT_IMOVU. */
738 /* Flags: I - (never set any flags)
739 Note: see SLJIT_INT_OP for further details. */
740 #define SLJIT_MOVU_SI 20
741 #define SLJIT_IMOVU (SLJIT_MOVU_SI | SLJIT_INT_OP)
742 /* Flags: - (never set any flags) */
743 #define SLJIT_MOVU_P 21
744 /* Flags: I | E | K */
745 #define SLJIT_NOT 22
746 #define SLJIT_INOT (SLJIT_NOT | SLJIT_INT_OP)
747 /* Flags: I | E | O | K */
748 #define SLJIT_NEG 23
749 #define SLJIT_INEG (SLJIT_NEG | SLJIT_INT_OP)
750 /* Count leading zeroes
751 Flags: I | E | K
752 Important note! Sparc 32 does not support K flag, since
753 the required popc instruction is introduced only in sparc 64. */
754 #define SLJIT_CLZ 24
755 #define SLJIT_ICLZ (SLJIT_CLZ | SLJIT_INT_OP)
756
757 SLJIT_API_FUNC_ATTRIBUTE sljit_si sljit_emit_op1(struct sljit_compiler *compiler, sljit_si op,
758 sljit_si dst, sljit_sw dstw,
759 sljit_si src, sljit_sw srcw);
760
761 /* Flags: I | E | O | C | K */
762 #define SLJIT_ADD 25
763 #define SLJIT_IADD (SLJIT_ADD | SLJIT_INT_OP)
764 /* Flags: I | C | K */
765 #define SLJIT_ADDC 26
766 #define SLJIT_IADDC (SLJIT_ADDC | SLJIT_INT_OP)
767 /* Flags: I | E | U | S | O | C | K */
768 #define SLJIT_SUB 27
769 #define SLJIT_ISUB (SLJIT_SUB | SLJIT_INT_OP)
770 /* Flags: I | C | K */
771 #define SLJIT_SUBC 28
772 #define SLJIT_ISUBC (SLJIT_SUBC | SLJIT_INT_OP)
773 /* Note: integer mul
774 Flags: I | O (see SLJIT_C_MUL_*) | K */
775 #define SLJIT_MUL 29
776 #define SLJIT_IMUL (SLJIT_MUL | SLJIT_INT_OP)
777 /* Flags: I | E | K */
778 #define SLJIT_AND 30
779 #define SLJIT_IAND (SLJIT_AND | SLJIT_INT_OP)
780 /* Flags: I | E | K */
781 #define SLJIT_OR 31
782 #define SLJIT_IOR (SLJIT_OR | SLJIT_INT_OP)
783 /* Flags: I | E | K */
784 #define SLJIT_XOR 32
785 #define SLJIT_IXOR (SLJIT_XOR | SLJIT_INT_OP)
786 /* Flags: I | E | K
787 Let bit_length be the length of the shift operation: 32 or 64.
788 If src2 is immediate, src2w is masked by (bit_length - 1).
789 Otherwise, if the content of src2 is outside the range from 0
790 to bit_length - 1, the operation is undefined. */
791 #define SLJIT_SHL 33
792 #define SLJIT_ISHL (SLJIT_SHL | SLJIT_INT_OP)
793 /* Flags: I | E | K
794 Let bit_length be the length of the shift operation: 32 or 64.
795 If src2 is immediate, src2w is masked by (bit_length - 1).
796 Otherwise, if the content of src2 is outside the range from 0
797 to bit_length - 1, the operation is undefined. */
798 #define SLJIT_LSHR 34
799 #define SLJIT_ILSHR (SLJIT_LSHR | SLJIT_INT_OP)
800 /* Flags: I | E | K
801 Let bit_length be the length of the shift operation: 32 or 64.
802 If src2 is immediate, src2w is masked by (bit_length - 1).
803 Otherwise, if the content of src2 is outside the range from 0
804 to bit_length - 1, the operation is undefined. */
805 #define SLJIT_ASHR 35
806 #define SLJIT_IASHR (SLJIT_ASHR | SLJIT_INT_OP)
807
808 SLJIT_API_FUNC_ATTRIBUTE sljit_si sljit_emit_op2(struct sljit_compiler *compiler, sljit_si op,
809 sljit_si dst, sljit_sw dstw,
810 sljit_si src1, sljit_sw src1w,
811 sljit_si src2, sljit_sw src2w);
812
813 /* The following function is a helper function for sljit_emit_op_custom.
814 It returns with the real machine register index ( >=0 ) of any SLJIT_R,
815 SLJIT_S and SLJIT_SP registers.
816
817 Note: it returns with -1 for virtual registers (only on x86-32). */
818
819 SLJIT_API_FUNC_ATTRIBUTE sljit_si sljit_get_register_index(sljit_si reg);
820
821 /* The following function is a helper function for sljit_emit_op_custom.
822 It returns with the real machine register index of any SLJIT_FLOAT register.
823
824 Note: the index is always an even number on ARM (except ARM-64), MIPS, and SPARC. */
825
826 SLJIT_API_FUNC_ATTRIBUTE sljit_si sljit_get_float_register_index(sljit_si reg);
827
828 /* Any instruction can be inserted into the instruction stream by
829 sljit_emit_op_custom. It has a similar purpose as inline assembly.
830 The size parameter must match to the instruction size of the target
831 architecture:
832
833 x86: 0 < size <= 15. The instruction argument can be byte aligned.
834 Thumb2: if size == 2, the instruction argument must be 2 byte aligned.
835 if size == 4, the instruction argument must be 4 byte aligned.
836 Otherwise: size must be 4 and instruction argument must be 4 byte aligned. */
837
838 SLJIT_API_FUNC_ATTRIBUTE sljit_si sljit_emit_op_custom(struct sljit_compiler *compiler,
839 void *instruction, sljit_si size);
840
841 /* Returns with non-zero if fpu is available. */
842
843 SLJIT_API_FUNC_ATTRIBUTE sljit_si sljit_is_fpu_available(void);
844
845 /* Flags: SP - (never set any flags) */
846 #define SLJIT_MOVD 36
847 #define SLJIT_MOVS (SLJIT_MOVD | SLJIT_SINGLE_OP)
848 /* Flags: SP - (never set any flags) */
849 #define SLJIT_NEGD 37
850 #define SLJIT_NEGS (SLJIT_NEGD | SLJIT_SINGLE_OP)
851 /* Flags: SP - (never set any flags) */
852 #define SLJIT_ABSD 38
853 #define SLJIT_ABSS (SLJIT_ABSD | SLJIT_SINGLE_OP)
854 /* Convert opcodes: CONV[DST_TYPE].FROM[SRC_TYPE]
855 SRC/DST TYPE can be: D - double, S - single, W - signed word, I - signed int
856 Rounding mode when the destination is W or I: round towards zero. */
857 /* Flags: SP - (never set any flags) */
858 #define SLJIT_CONVD_FROMS 39
859 #define SLJIT_CONVS_FROMD (SLJIT_CONVD_FROMS | SLJIT_SINGLE_OP)
860 /* Flags: SP - (never set any flags) */
861 #define SLJIT_CONVW_FROMD 40
862 #define SLJIT_CONVW_FROMS (SLJIT_CONVW_FROMD | SLJIT_SINGLE_OP)
863 /* Flags: SP - (never set any flags) */
864 #define SLJIT_CONVI_FROMD 41
865 #define SLJIT_CONVI_FROMS (SLJIT_CONVI_FROMD | SLJIT_SINGLE_OP)
866 /* Flags: SP - (never set any flags) */
867 #define SLJIT_CONVD_FROMW 42
868 #define SLJIT_CONVS_FROMW (SLJIT_CONVD_FROMW | SLJIT_SINGLE_OP)
869 /* Flags: SP - (never set any flags) */
870 #define SLJIT_CONVD_FROMI 43
871 #define SLJIT_CONVS_FROMI (SLJIT_CONVD_FROMI | SLJIT_SINGLE_OP)
872 /* Note: dst is the left and src is the right operand for SLJIT_CMPD.
873 Note: NaN check is always performed. If SLJIT_C_FLOAT_UNORDERED flag
874 is set, the comparison result is unpredictable.
875 Flags: SP | E | S (see SLJIT_C_FLOAT_*) */
876 #define SLJIT_CMPD 44
877 #define SLJIT_CMPS (SLJIT_CMPD | SLJIT_SINGLE_OP)
878
879 SLJIT_API_FUNC_ATTRIBUTE sljit_si sljit_emit_fop1(struct sljit_compiler *compiler, sljit_si op,
880 sljit_si dst, sljit_sw dstw,
881 sljit_si src, sljit_sw srcw);
882
883 /* Flags: SP - (never set any flags) */
884 #define SLJIT_ADDD 45
885 #define SLJIT_ADDS (SLJIT_ADDD | SLJIT_SINGLE_OP)
886 /* Flags: SP - (never set any flags) */
887 #define SLJIT_SUBD 46
888 #define SLJIT_SUBS (SLJIT_SUBD | SLJIT_SINGLE_OP)
889 /* Flags: SP - (never set any flags) */
890 #define SLJIT_MULD 47
891 #define SLJIT_MULS (SLJIT_MULD | SLJIT_SINGLE_OP)
892 /* Flags: SP - (never set any flags) */
893 #define SLJIT_DIVD 48
894 #define SLJIT_DIVS (SLJIT_DIVD | SLJIT_SINGLE_OP)
895
896 SLJIT_API_FUNC_ATTRIBUTE sljit_si sljit_emit_fop2(struct sljit_compiler *compiler, sljit_si op,
897 sljit_si dst, sljit_sw dstw,
898 sljit_si src1, sljit_sw src1w,
899 sljit_si src2, sljit_sw src2w);
900
901 /* Label and jump instructions. */
902
903 SLJIT_API_FUNC_ATTRIBUTE struct sljit_label* sljit_emit_label(struct sljit_compiler *compiler);
904
905 /* Invert conditional instruction: xor (^) with 0x1 */
906 #define SLJIT_C_EQUAL 0
907 #define SLJIT_C_ZERO 0
908 #define SLJIT_C_NOT_EQUAL 1
909 #define SLJIT_C_NOT_ZERO 1
910
911 #define SLJIT_C_LESS 2
912 #define SLJIT_C_GREATER_EQUAL 3
913 #define SLJIT_C_GREATER 4
914 #define SLJIT_C_LESS_EQUAL 5
915 #define SLJIT_C_SIG_LESS 6
916 #define SLJIT_C_SIG_GREATER_EQUAL 7
917 #define SLJIT_C_SIG_GREATER 8
918 #define SLJIT_C_SIG_LESS_EQUAL 9
919
920 #define SLJIT_C_OVERFLOW 10
921 #define SLJIT_C_NOT_OVERFLOW 11
922
923 #define SLJIT_C_MUL_OVERFLOW 12
924 #define SLJIT_C_MUL_NOT_OVERFLOW 13
925
926 #define SLJIT_C_FLOAT_EQUAL 14
927 #define SLJIT_C_FLOAT_NOT_EQUAL 15
928 #define SLJIT_C_FLOAT_LESS 16
929 #define SLJIT_C_FLOAT_GREATER_EQUAL 17
930 #define SLJIT_C_FLOAT_GREATER 18
931 #define SLJIT_C_FLOAT_LESS_EQUAL 19
932 #define SLJIT_C_FLOAT_UNORDERED 20
933 #define SLJIT_C_FLOAT_ORDERED 21
934
935 #define SLJIT_JUMP 22
936 #define SLJIT_FAST_CALL 23
937 #define SLJIT_CALL0 24
938 #define SLJIT_CALL1 25
939 #define SLJIT_CALL2 26
940 #define SLJIT_CALL3 27
941
942 /* Fast calling method. See sljit_emit_fast_enter / sljit_emit_fast_return. */
943
944 /* The target can be changed during runtime (see: sljit_set_jump_addr). */
945 #define SLJIT_REWRITABLE_JUMP 0x1000
946
947 /* Emit a jump instruction. The destination is not set, only the type of the jump.
948 type must be between SLJIT_C_EQUAL and SLJIT_CALL3
949 type can be combined (or'ed) with SLJIT_REWRITABLE_JUMP
950 Flags: - (never set any flags) for both conditional and unconditional jumps.
951 Flags: destroy all flags for calls. */
952 SLJIT_API_FUNC_ATTRIBUTE struct sljit_jump* sljit_emit_jump(struct sljit_compiler *compiler, sljit_si type);
953
954 /* Basic arithmetic comparison. In most architectures it is implemented as
955 an SLJIT_SUB operation (with SLJIT_UNUSED destination and setting
956 appropriate flags) followed by a sljit_emit_jump. However some
957 architectures (i.e: MIPS) may employ special optimizations here. It is
958 suggested to use this comparison form when appropriate.
959 type must be between SLJIT_C_EQUAL and SLJIT_C_SIG_LESS_EQUAL
960 type can be combined (or'ed) with SLJIT_REWRITABLE_JUMP or SLJIT_INT_OP
961 Flags: destroy flags. */
962 SLJIT_API_FUNC_ATTRIBUTE struct sljit_jump* sljit_emit_cmp(struct sljit_compiler *compiler, sljit_si type,
963 sljit_si src1, sljit_sw src1w,
964 sljit_si src2, sljit_sw src2w);
965
966 /* Basic floating point comparison. In most architectures it is implemented as
967 an SLJIT_FCMP operation (setting appropriate flags) followed by a
968 sljit_emit_jump. However some architectures (i.e: MIPS) may employ
969 special optimizations here. It is suggested to use this comparison form
970 when appropriate.
971 type must be between SLJIT_C_FLOAT_EQUAL and SLJIT_C_FLOAT_ORDERED
972 type can be combined (or'ed) with SLJIT_REWRITABLE_JUMP and SLJIT_SINGLE_OP
973 Flags: destroy flags.
974 Note: if either operand is NaN, the behaviour is undefined for
975 type <= SLJIT_C_FLOAT_LESS_EQUAL. */
976 SLJIT_API_FUNC_ATTRIBUTE struct sljit_jump* sljit_emit_fcmp(struct sljit_compiler *compiler, sljit_si type,
977 sljit_si src1, sljit_sw src1w,
978 sljit_si src2, sljit_sw src2w);
979
980 /* Set the destination of the jump to this label. */
981 SLJIT_API_FUNC_ATTRIBUTE void sljit_set_label(struct sljit_jump *jump, struct sljit_label* label);
982 /* Set the destination address of the jump to this label. */
983 SLJIT_API_FUNC_ATTRIBUTE void sljit_set_target(struct sljit_jump *jump, sljit_uw target);
984
985 /* Call function or jump anywhere. Both direct and indirect form
986 type must be between SLJIT_JUMP and SLJIT_CALL3
987 Direct form: set src to SLJIT_IMM() and srcw to the address
988 Indirect form: any other valid addressing mode
989 Flags: - (never set any flags) for unconditional jumps.
990 Flags: destroy all flags for calls. */
991 SLJIT_API_FUNC_ATTRIBUTE sljit_si sljit_emit_ijump(struct sljit_compiler *compiler, sljit_si type, sljit_si src, sljit_sw srcw);
992
993 /* Perform the operation using the conditional flags as the second argument.
994 Type must always be between SLJIT_C_EQUAL and SLJIT_C_FLOAT_ORDERED. The
995 value represented by the type is 1, if the condition represented by the type
996 is fulfilled, and 0 otherwise.
997
998 If op == SLJIT_MOV, SLJIT_MOV_SI, SLJIT_MOV_UI:
999 Set dst to the value represented by the type (0 or 1).
1000 Src must be SLJIT_UNUSED, and srcw must be 0
1001 Flags: - (never set any flags)
1002 If op == SLJIT_OR, op == SLJIT_AND, op == SLJIT_XOR
1003 Performs the binary operation using src as the first, and the value
1004 represented by type as the second argument.
1005 Important note: only dst=src and dstw=srcw is supported at the moment!
1006 Flags: I | E | K
1007 Note: sljit_emit_op_flags does nothing, if dst is SLJIT_UNUSED (regardless of op). */
1008 SLJIT_API_FUNC_ATTRIBUTE sljit_si sljit_emit_op_flags(struct sljit_compiler *compiler, sljit_si op,
1009 sljit_si dst, sljit_sw dstw,
1010 sljit_si src, sljit_sw srcw,
1011 sljit_si type);
1012
1013 /* Copies the base address of SLJIT_SP + offset to dst.
1014 Flags: - (never set any flags) */
1015 SLJIT_API_FUNC_ATTRIBUTE sljit_si sljit_get_local_base(struct sljit_compiler *compiler, sljit_si dst, sljit_sw dstw, sljit_sw offset);
1016
1017 /* The constant can be changed runtime (see: sljit_set_const)
1018 Flags: - (never set any flags) */
1019 SLJIT_API_FUNC_ATTRIBUTE struct sljit_const* sljit_emit_const(struct sljit_compiler *compiler, sljit_si dst, sljit_sw dstw, sljit_sw init_value);
1020
1021 /* After the code generation the address for label, jump and const instructions
1022 are computed. Since these structures are freed by sljit_free_compiler, the
1023 addresses must be preserved by the user program elsewere. */
1024 static SLJIT_INLINE sljit_uw sljit_get_label_addr(struct sljit_label *label) { return label->addr; }
1025 static SLJIT_INLINE sljit_uw sljit_get_jump_addr(struct sljit_jump *jump) { return jump->addr; }
1026 static SLJIT_INLINE sljit_uw sljit_get_const_addr(struct sljit_const *const_) { return const_->addr; }
1027
1028 /* Only the address is required to rewrite the code. */
1029 SLJIT_API_FUNC_ATTRIBUTE void sljit_set_jump_addr(sljit_uw addr, sljit_uw new_addr);
1030 SLJIT_API_FUNC_ATTRIBUTE void sljit_set_const(sljit_uw addr, sljit_sw new_constant);
1031
1032 /* --------------------------------------------------------------------- */
1033 /* Miscellaneous utility functions */
1034 /* --------------------------------------------------------------------- */
1035
1036 #define SLJIT_MAJOR_VERSION 0
1037 #define SLJIT_MINOR_VERSION 92
1038
1039 /* Get the human readable name of the platform. Can be useful on platforms
1040 like ARM, where ARM and Thumb2 functions can be mixed, and
1041 it is useful to know the type of the code generator. */
1042 SLJIT_API_FUNC_ATTRIBUTE SLJIT_CONST char* sljit_get_platform_name(void);
1043
1044 /* Portable helper function to get an offset of a member. */
1045 #define SLJIT_OFFSETOF(base, member) ((sljit_sw)(&((base*)0x10)->member) - 0x10)
1046
1047 #if (defined SLJIT_UTIL_GLOBAL_LOCK && SLJIT_UTIL_GLOBAL_LOCK)
1048 /* This global lock is useful to compile common functions. */
1049 SLJIT_API_FUNC_ATTRIBUTE void SLJIT_CALL sljit_grab_lock(void);
1050 SLJIT_API_FUNC_ATTRIBUTE void SLJIT_CALL sljit_release_lock(void);
1051 #endif
1052
1053 #if (defined SLJIT_UTIL_STACK && SLJIT_UTIL_STACK)
1054
1055 /* The sljit_stack is a utiliy feature of sljit, which allocates a
1056 writable memory region between base (inclusive) and limit (exclusive).
1057 Both base and limit is a pointer, and base is always <= than limit.
1058 This feature uses the "address space reserve" feature
1059 of modern operating systems. Basically we don't need to allocate a
1060 huge memory block in one step for the worst case, we can start with
1061 a smaller chunk and extend it later. Since the address space is
1062 reserved, the data never copied to other regions, thus it is safe
1063 to store pointers here. */
1064
1065 /* Note: The base field is aligned to PAGE_SIZE bytes (usually 4k or more).
1066 Note: stack growing should not happen in small steps: 4k, 16k or even
1067 bigger growth is better.
1068 Note: this structure may not be supported by all operating systems.
1069 Some kind of fallback mechanism is suggested when SLJIT_UTIL_STACK
1070 is not defined. */
1071
1072 struct sljit_stack {
1073 /* User data, anything can be stored here.
1074 Starting with the same value as base. */
1075 sljit_uw top;
1076 /* These members are read only. */
1077 sljit_uw base;
1078 sljit_uw limit;
1079 sljit_uw max_limit;
1080 };
1081
1082 /* Returns NULL if unsuccessful.
1083 Note: limit and max_limit contains the size for stack allocation
1084 Note: the top field is initialized to base. */
1085 SLJIT_API_FUNC_ATTRIBUTE struct sljit_stack* SLJIT_CALL sljit_allocate_stack(sljit_uw limit, sljit_uw max_limit);
1086 SLJIT_API_FUNC_ATTRIBUTE void SLJIT_CALL sljit_free_stack(struct sljit_stack* stack);
1087
1088 /* Can be used to increase (allocate) or decrease (free) the memory area.
1089 Returns with a non-zero value if unsuccessful. If new_limit is greater than
1090 max_limit, it will fail. It is very easy to implement a stack data structure,
1091 since the growth ratio can be added to the current limit, and sljit_stack_resize
1092 will do all the necessary checks. The fields of the stack are not changed if
1093 sljit_stack_resize fails. */
1094 SLJIT_API_FUNC_ATTRIBUTE sljit_sw SLJIT_CALL sljit_stack_resize(struct sljit_stack* stack, sljit_uw new_limit);
1095
1096 #endif /* (defined SLJIT_UTIL_STACK && SLJIT_UTIL_STACK) */
1097
1098 #if !(defined SLJIT_INDIRECT_CALL && SLJIT_INDIRECT_CALL)
1099
1100 /* Get the entry address of a given function. */
1101 #define SLJIT_FUNC_OFFSET(func_name) ((sljit_sw)func_name)
1102
1103 #else /* !(defined SLJIT_INDIRECT_CALL && SLJIT_INDIRECT_CALL) */
1104
1105 /* All JIT related code should be placed in the same context (library, binary, etc.). */
1106
1107 #define SLJIT_FUNC_OFFSET(func_name) (*(sljit_sw*)(void*)func_name)
1108
1109 /* For powerpc64, the function pointers point to a context descriptor. */
1110 struct sljit_function_context {
1111 sljit_sw addr;
1112 sljit_sw r2;
1113 sljit_sw r11;
1114 };
1115
1116 /* Fill the context arguments using the addr and the function.
1117 If func_ptr is NULL, it will not be set to the address of context
1118 If addr is NULL, the function address also comes from the func pointer. */
1119 SLJIT_API_FUNC_ATTRIBUTE void sljit_set_function_context(void** func_ptr, struct sljit_function_context* context, sljit_sw addr, void* func);
1120
1121 #endif /* !(defined SLJIT_INDIRECT_CALL && SLJIT_INDIRECT_CALL) */
1122
1123 #endif /* _SLJIT_LIR_H_ */

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