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1 /*
2  *    Stack-less Just-In-Time compiler
3  *
4  *    Copyright 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, as long as the compiling
40         context is the same. See sljit_emit_enter for more details.
41       - Supports self modifying code: target of any jump and call
42         instructions and some constant values can be dynamically modified
43         during runtime. See SLJIT_REWRITABLE_JUMP.
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       - A fixed stack space can be allocated for local variables
48       - The compiler is thread-safe
49       - The compiler is highly configurable through preprocessor macros.
50         You can disable unneeded features (multithreading in single
51         threaded applications), and you can use your own system functions
52         (including memory allocators). See sljitConfig.h.
53     Disadvantages:
54       - The compiler is more like a platform independent assembler, so
55         there is no built-in variable management. Registers and stack must
56         be managed manually (the name of the compiler refers to this).
57     In practice:
58       - This approach is very effective for interpreters
59         - One of the saved registers typically points to a stack interface
60         - It can jump to any exception handler anytime (even if it belongs
61           to another function)
62         - Hot paths can be modified during runtime reflecting the changes
63           of the fastest execution path of the dynamic language
64         - SLJIT supports complex memory addressing modes
65         - mainly position and context independent code (except some cases)
66 
67     For valgrind users:
68       - pass --smc-check=all argument to valgrind, since JIT is a "self-modifying code"
69 */
70 
71 #if (defined SLJIT_HAVE_CONFIG_PRE && SLJIT_HAVE_CONFIG_PRE)
72 #include "sljitConfigPre.h"
73 #endif /* SLJIT_HAVE_CONFIG_PRE */
74 
75 #include "sljitConfig.h"
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 #if (defined SLJIT_HAVE_CONFIG_POST && SLJIT_HAVE_CONFIG_POST)
84 #include "sljitConfigPost.h"
85 #endif /* SLJIT_HAVE_CONFIG_POST */
86 
87 #ifdef __cplusplus
88 extern "C" {
89 #endif
90 
91 /* Version numbers. */
92 #define SLJIT_MAJOR_VERSION	0
93 #define SLJIT_MINOR_VERSION	95
94 
95 /* --------------------------------------------------------------------- */
96 /*  Error codes                                                          */
97 /* --------------------------------------------------------------------- */
98 
99 /* Indicates no error. */
100 #define SLJIT_SUCCESS			0
101 /* After the call of sljit_generate_code(), the error code of the compiler
102    is set to this value to avoid further code generation.
103    The complier should be freed after sljit_generate_code(). */
104 #define SLJIT_ERR_COMPILED		1
105 /* Cannot allocate non-executable memory. */
106 #define SLJIT_ERR_ALLOC_FAILED		2
107 /* Cannot allocate executable memory.
108    Only sljit_generate_code() returns with this error code. */
109 #define SLJIT_ERR_EX_ALLOC_FAILED	3
110 /* Return value for SLJIT_CONFIG_UNSUPPORTED placeholder architecture. */
111 #define SLJIT_ERR_UNSUPPORTED		4
112 /* An ivalid argument is passed to any SLJIT function. */
113 #define SLJIT_ERR_BAD_ARGUMENT		5
114 
115 /* --------------------------------------------------------------------- */
116 /*  Registers                                                            */
117 /* --------------------------------------------------------------------- */
118 
119 /*
120   Scratch (R) registers: registers which may not preserve their values
121   across function calls.
122 
123   Saved (S) registers: registers which preserve their values across
124   function calls.
125 
126   The scratch and saved register sets overlap. The last scratch register
127   is the first saved register, the one before the last is the second saved
128   register, and so on.
129 
130   If an architecture provides two scratch and three saved registers,
131   its scratch and saved register sets are the following:
132 
133      R0   |        |   R0 is always a scratch register
134      R1   |        |   R1 is always a scratch register
135     [R2]  |   S2   |   R2 and S2 represent the same physical register
136     [R3]  |   S1   |   R3 and S1 represent the same physical register
137     [R4]  |   S0   |   R4 and S0 represent the same physical register
138 
139   Note: SLJIT_NUMBER_OF_SCRATCH_REGISTERS would be 2 and
140         SLJIT_NUMBER_OF_SAVED_REGISTERS would be 3 for this architecture.
141 
142   Note: On all supported architectures SLJIT_NUMBER_OF_REGISTERS >= 12
143         and SLJIT_NUMBER_OF_SAVED_REGISTERS >= 6. However, 6 registers
144         are virtual on x86-32. See below.
145 
146   The purpose of this definition is convenience: saved registers can
147   be used as extra scratch registers. For example four registers can
148   be specified as scratch registers and the fifth one as saved register
149   on the CPU above and any user code which requires four scratch
150   registers can run unmodified. The SLJIT compiler automatically saves
151   the content of the two extra scratch register on the stack. Scratch
152   registers can also be preserved by saving their value on the stack
153   but this needs to be done manually.
154 
155   Note: To emphasize that registers assigned to R2-R4 are saved
156         registers, they are enclosed by square brackets.
157 
158   Note: sljit_emit_enter and sljit_set_context defines whether a register
159         is S or R register. E.g: when 3 scratches and 1 saved is mapped
160         by sljit_emit_enter, the allowed register set will be: R0-R2 and
161         S0. Although S2 is mapped to the same position as R2, it does not
162         available in the current configuration. Furthermore the S1 register
163         is not available at all.
164 */
165 
166 /* Scratch registers. */
167 #define SLJIT_R0	1
168 #define SLJIT_R1	2
169 #define SLJIT_R2	3
170 /* Note: on x86-32, R3 - R6 (same as S3 - S6) are emulated (they
171    are allocated on the stack). These registers are called virtual
172    and cannot be used for memory addressing (cannot be part of
173    any SLJIT_MEM1, SLJIT_MEM2 construct). There is no such
174    limitation on other CPUs. See sljit_get_register_index(). */
175 #define SLJIT_R3	4
176 #define SLJIT_R4	5
177 #define SLJIT_R5	6
178 #define SLJIT_R6	7
179 #define SLJIT_R7	8
180 #define SLJIT_R8	9
181 #define SLJIT_R9	10
182 /* All R registers provided by the architecture can be accessed by SLJIT_R(i)
183    The i parameter must be >= 0 and < SLJIT_NUMBER_OF_REGISTERS. */
184 #define SLJIT_R(i)	(1 + (i))
185 
186 /* Saved registers. */
187 #define SLJIT_S0	(SLJIT_NUMBER_OF_REGISTERS)
188 #define SLJIT_S1	(SLJIT_NUMBER_OF_REGISTERS - 1)
189 #define SLJIT_S2	(SLJIT_NUMBER_OF_REGISTERS - 2)
190 /* Note: on x86-32, S3 - S6 (same as R3 - R6) are emulated (they
191    are allocated on the stack). These registers are called virtual
192    and cannot be used for memory addressing (cannot be part of
193    any SLJIT_MEM1, SLJIT_MEM2 construct). There is no such
194    limitation on other CPUs. See sljit_get_register_index(). */
195 #define SLJIT_S3	(SLJIT_NUMBER_OF_REGISTERS - 3)
196 #define SLJIT_S4	(SLJIT_NUMBER_OF_REGISTERS - 4)
197 #define SLJIT_S5	(SLJIT_NUMBER_OF_REGISTERS - 5)
198 #define SLJIT_S6	(SLJIT_NUMBER_OF_REGISTERS - 6)
199 #define SLJIT_S7	(SLJIT_NUMBER_OF_REGISTERS - 7)
200 #define SLJIT_S8	(SLJIT_NUMBER_OF_REGISTERS - 8)
201 #define SLJIT_S9	(SLJIT_NUMBER_OF_REGISTERS - 9)
202 /* All S registers provided by the architecture can be accessed by SLJIT_S(i)
203    The i parameter must be >= 0 and < SLJIT_NUMBER_OF_SAVED_REGISTERS. */
204 #define SLJIT_S(i)	(SLJIT_NUMBER_OF_REGISTERS - (i))
205 
206 /* Registers >= SLJIT_FIRST_SAVED_REG are saved registers. */
207 #define SLJIT_FIRST_SAVED_REG (SLJIT_S0 - SLJIT_NUMBER_OF_SAVED_REGISTERS + 1)
208 
209 /* The SLJIT_SP provides direct access to the linear stack space allocated by
210    sljit_emit_enter. It can only be used in the following form: SLJIT_MEM1(SLJIT_SP).
211    The immediate offset is extended by the relative stack offset automatically.
212    The sljit_get_local_base can be used to obtain the real address of a value. */
213 #define SLJIT_SP	(SLJIT_NUMBER_OF_REGISTERS + 1)
214 
215 /* Return with machine word. */
216 
217 #define SLJIT_RETURN_REG	SLJIT_R0
218 
219 /* --------------------------------------------------------------------- */
220 /*  Floating point registers                                             */
221 /* --------------------------------------------------------------------- */
222 
223 /* Each floating point register can store a 32 or a 64 bit precision
224    value. The FR and FS register sets are overlap in the same way as R
225    and S register sets. See above. */
226 
227 /* Floating point scratch registers. */
228 #define SLJIT_FR0	1
229 #define SLJIT_FR1	2
230 #define SLJIT_FR2	3
231 #define SLJIT_FR3	4
232 #define SLJIT_FR4	5
233 #define SLJIT_FR5	6
234 /* All FR registers provided by the architecture can be accessed by SLJIT_FR(i)
235    The i parameter must be >= 0 and < SLJIT_NUMBER_OF_FLOAT_REGISTERS. */
236 #define SLJIT_FR(i)	(1 + (i))
237 
238 /* Floating point saved registers. */
239 #define SLJIT_FS0	(SLJIT_NUMBER_OF_FLOAT_REGISTERS)
240 #define SLJIT_FS1	(SLJIT_NUMBER_OF_FLOAT_REGISTERS - 1)
241 #define SLJIT_FS2	(SLJIT_NUMBER_OF_FLOAT_REGISTERS - 2)
242 #define SLJIT_FS3	(SLJIT_NUMBER_OF_FLOAT_REGISTERS - 3)
243 #define SLJIT_FS4	(SLJIT_NUMBER_OF_FLOAT_REGISTERS - 4)
244 #define SLJIT_FS5	(SLJIT_NUMBER_OF_FLOAT_REGISTERS - 5)
245 /* All S registers provided by the architecture can be accessed by SLJIT_FS(i)
246    The i parameter must be >= 0 and < SLJIT_NUMBER_OF_SAVED_FLOAT_REGISTERS. */
247 #define SLJIT_FS(i)	(SLJIT_NUMBER_OF_FLOAT_REGISTERS - (i))
248 
249 /* Float registers >= SLJIT_FIRST_SAVED_FLOAT_REG are saved registers. */
250 #define SLJIT_FIRST_SAVED_FLOAT_REG (SLJIT_FS0 - SLJIT_NUMBER_OF_SAVED_FLOAT_REGISTERS + 1)
251 
252 /* Return with floating point arg. */
253 
254 #define SLJIT_RETURN_FREG	SLJIT_FR0
255 
256 /* --------------------------------------------------------------------- */
257 /*  Argument type definitions                                            */
258 /* --------------------------------------------------------------------- */
259 
260 /* The following argument type definitions are used by sljit_emit_enter,
261    sljit_set_context, sljit_emit_call, and sljit_emit_icall functions.
262 
263    As for sljit_emit_call and sljit_emit_icall, the first integer argument
264    must be placed into SLJIT_R0, the second one into SLJIT_R1, and so on.
265    Similarly the first floating point argument must be placed into SLJIT_FR0,
266    the second one into SLJIT_FR1, and so on.
267 
268    As for sljit_emit_enter, the integer arguments can be stored in scratch
269    or saved registers. The first integer argument without _R postfix is
270    stored in SLJIT_S0, the next one in SLJIT_S1, and so on. The integer
271    arguments with _R postfix are placed into scratch registers. The index
272    of the scratch register is the count of the previous integer arguments
273    starting from SLJIT_R0. The floating point arguments are always placed
274    into SLJIT_FR0, SLJIT_FR1, and so on.
275 
276    Note: if a function is called by sljit_emit_call/sljit_emit_icall and
277          an argument is stored in a scratch register by sljit_emit_enter,
278          that argument uses the same scratch register index for both
279          integer and floating point arguments.
280 
281    Example function definition:
282      sljit_f32 SLJIT_FUNC example_c_callback(void *arg_a,
283          sljit_f64 arg_b, sljit_u32 arg_c, sljit_f32 arg_d);
284 
285    Argument type definition:
286      SLJIT_ARG_RETURN(SLJIT_ARG_TYPE_F32)
287         | SLJIT_ARG_VALUE(SLJIT_ARG_TYPE_P, 1) | SLJIT_ARG_VALUE(SLJIT_ARG_TYPE_F64, 2)
288         | SLJIT_ARG_VALUE(SLJIT_ARG_TYPE_32, 3) | SLJIT_ARG_VALUE(SLJIT_ARG_TYPE_F32, 4)
289 
290    Short form of argument type definition:
291      SLJIT_ARGS4(32, P, F64, 32, F32)
292 
293    Argument passing:
294      arg_a must be placed in SLJIT_R0
295      arg_c must be placed in SLJIT_R1
296      arg_b must be placed in SLJIT_FR0
297      arg_d must be placed in SLJIT_FR1
298 
299    Examples for argument processing by sljit_emit_enter:
300      SLJIT_ARGS4(VOID, P, 32_R, F32, W)
301      Arguments are placed into: SLJIT_S0, SLJIT_R1, SLJIT_FR0, SLJIT_S1
302 
303      SLJIT_ARGS4(VOID, W, W_R, W, W_R)
304      Arguments are placed into: SLJIT_S0, SLJIT_R1, SLJIT_S1, SLJIT_R3
305 
306      SLJIT_ARGS4(VOID, F64, W, F32, W_R)
307      Arguments are placed into: SLJIT_FR0, SLJIT_S0, SLJIT_FR1, SLJIT_R1
308 
309      Note: it is recommended to pass the scratch arguments first
310      followed by the saved arguments:
311 
312        SLJIT_ARGS4(VOID, W_R, W_R, W, W)
313        Arguments are placed into: SLJIT_R0, SLJIT_R1, SLJIT_S0, SLJIT_S1
314 */
315 
316 /* The following flag is only allowed for the integer arguments of
317    sljit_emit_enter. When the flag is set, the integer argument is
318    stored in a scratch register instead of a saved register. */
319 #define SLJIT_ARG_TYPE_SCRATCH_REG 0x8
320 
321 /* Void result, can only be used by SLJIT_ARG_RETURN. */
322 #define SLJIT_ARG_TYPE_VOID	0
323 /* Machine word sized integer argument or result. */
324 #define SLJIT_ARG_TYPE_W	1
325 #define SLJIT_ARG_TYPE_W_R	(SLJIT_ARG_TYPE_W | SLJIT_ARG_TYPE_SCRATCH_REG)
326 /* 32 bit integer argument or result. */
327 #define SLJIT_ARG_TYPE_32	2
328 #define SLJIT_ARG_TYPE_32_R	(SLJIT_ARG_TYPE_32 | SLJIT_ARG_TYPE_SCRATCH_REG)
329 /* Pointer sized integer argument or result. */
330 #define SLJIT_ARG_TYPE_P	3
331 #define SLJIT_ARG_TYPE_P_R	(SLJIT_ARG_TYPE_P | SLJIT_ARG_TYPE_SCRATCH_REG)
332 /* 64 bit floating point argument or result. */
333 #define SLJIT_ARG_TYPE_F64	4
334 /* 32 bit floating point argument or result. */
335 #define SLJIT_ARG_TYPE_F32	5
336 
337 #define SLJIT_ARG_SHIFT 4
338 #define SLJIT_ARG_RETURN(type) (type)
339 #define SLJIT_ARG_VALUE(type, idx) ((type) << ((idx) * SLJIT_ARG_SHIFT))
340 
341 /* Simplified argument list definitions.
342 
343    The following definition:
344        SLJIT_ARG_RETURN(SLJIT_ARG_TYPE_W) | SLJIT_ARG_VALUE(SLJIT_ARG_TYPE_F32, 1)
345 
346    can be shortened to:
347        SLJIT_ARGS1(W, F32)
348 */
349 
350 #define SLJIT_ARG_TO_TYPE(type) SLJIT_ARG_TYPE_ ## type
351 
352 #define SLJIT_ARGS0(ret) \
353 	SLJIT_ARG_RETURN(SLJIT_ARG_TO_TYPE(ret))
354 
355 #define SLJIT_ARGS1(ret, arg1) \
356 	(SLJIT_ARGS0(ret) | SLJIT_ARG_VALUE(SLJIT_ARG_TO_TYPE(arg1), 1))
357 
358 #define SLJIT_ARGS2(ret, arg1, arg2) \
359 	(SLJIT_ARGS1(ret, arg1) | SLJIT_ARG_VALUE(SLJIT_ARG_TO_TYPE(arg2), 2))
360 
361 #define SLJIT_ARGS3(ret, arg1, arg2, arg3) \
362 	(SLJIT_ARGS2(ret, arg1, arg2) | SLJIT_ARG_VALUE(SLJIT_ARG_TO_TYPE(arg3), 3))
363 
364 #define SLJIT_ARGS4(ret, arg1, arg2, arg3, arg4) \
365 	(SLJIT_ARGS3(ret, arg1, arg2, arg3) | SLJIT_ARG_VALUE(SLJIT_ARG_TO_TYPE(arg4), 4))
366 
367 /* --------------------------------------------------------------------- */
368 /*  Main structures and functions                                        */
369 /* --------------------------------------------------------------------- */
370 
371 /*
372 	The following structures are private, and can be changed in the
373 	future. Keeping them here allows code inlining.
374 */
375 
376 struct sljit_memory_fragment {
377 	struct sljit_memory_fragment *next;
378 	sljit_uw used_size;
379 	/* Must be aligned to sljit_sw. */
380 	sljit_u8 memory[1];
381 };
382 
383 struct sljit_label {
384 	struct sljit_label *next;
385 	sljit_uw addr;
386 	/* The maximum size difference. */
387 	sljit_uw size;
388 };
389 
390 struct sljit_jump {
391 	struct sljit_jump *next;
392 	sljit_uw addr;
393 	/* Architecture dependent flags. */
394 	sljit_uw flags;
395 	union {
396 		sljit_uw target;
397 		struct sljit_label *label;
398 	} u;
399 };
400 
401 struct sljit_put_label {
402 	struct sljit_put_label *next;
403 	struct sljit_label *label;
404 	sljit_uw addr;
405 	sljit_uw flags;
406 };
407 
408 struct sljit_const {
409 	struct sljit_const *next;
410 	sljit_uw addr;
411 };
412 
413 struct sljit_compiler {
414 	sljit_s32 error;
415 	sljit_s32 options;
416 
417 	struct sljit_label *labels;
418 	struct sljit_jump *jumps;
419 	struct sljit_put_label *put_labels;
420 	struct sljit_const *consts;
421 	struct sljit_label *last_label;
422 	struct sljit_jump *last_jump;
423 	struct sljit_const *last_const;
424 	struct sljit_put_label *last_put_label;
425 
426 	void *allocator_data;
427 	void *exec_allocator_data;
428 	struct sljit_memory_fragment *buf;
429 	struct sljit_memory_fragment *abuf;
430 
431 	/* Available scratch registers. */
432 	sljit_s32 scratches;
433 	/* Available saved registers. */
434 	sljit_s32 saveds;
435 	/* Available float scratch registers. */
436 	sljit_s32 fscratches;
437 	/* Available float saved registers. */
438 	sljit_s32 fsaveds;
439 	/* Local stack size. */
440 	sljit_s32 local_size;
441 	/* Maximum code size. */
442 	sljit_uw size;
443 	/* Relative offset of the executable mapping from the writable mapping. */
444 	sljit_sw executable_offset;
445 	/* Executable size for statistical purposes. */
446 	sljit_uw executable_size;
447 
448 #if (defined SLJIT_HAS_STATUS_FLAGS_STATE && SLJIT_HAS_STATUS_FLAGS_STATE)
449 	sljit_s32 status_flags_state;
450 #endif
451 
452 #if (defined SLJIT_CONFIG_X86_32 && SLJIT_CONFIG_X86_32)
453 	sljit_s32 args_size;
454 #endif
455 
456 #if (defined SLJIT_CONFIG_X86_64 && SLJIT_CONFIG_X86_64)
457 	sljit_s32 mode32;
458 #endif
459 
460 #if (defined SLJIT_CONFIG_ARM_V5 && SLJIT_CONFIG_ARM_V5)
461 	/* Constant pool handling. */
462 	sljit_uw *cpool;
463 	sljit_u8 *cpool_unique;
464 	sljit_uw cpool_diff;
465 	sljit_uw cpool_fill;
466 	/* Other members. */
467 	/* Contains pointer, "ldr pc, [...]" pairs. */
468 	sljit_uw patches;
469 #endif
470 
471 #if (defined SLJIT_CONFIG_ARM_V5 && SLJIT_CONFIG_ARM_V5) || (defined SLJIT_CONFIG_ARM_V7 && SLJIT_CONFIG_ARM_V7)
472 	/* Temporary fields. */
473 	sljit_uw shift_imm;
474 #endif /* SLJIT_CONFIG_ARM_V5 || SLJIT_CONFIG_ARM_V7 */
475 
476 #if (defined SLJIT_CONFIG_ARM_32 && SLJIT_CONFIG_ARM_32) && (defined __SOFTFP__)
477 	sljit_uw args_size;
478 #endif
479 
480 #if (defined SLJIT_CONFIG_PPC && SLJIT_CONFIG_PPC)
481 	sljit_u32 imm;
482 #endif
483 
484 #if (defined SLJIT_CONFIG_MIPS && SLJIT_CONFIG_MIPS)
485 	sljit_s32 delay_slot;
486 	sljit_s32 cache_arg;
487 	sljit_sw cache_argw;
488 #endif
489 
490 #if (defined SLJIT_CONFIG_MIPS_32 && SLJIT_CONFIG_MIPS_32)
491 	sljit_uw args_size;
492 #endif
493 
494 #if (defined SLJIT_CONFIG_RISCV && SLJIT_CONFIG_RISCV)
495 	sljit_s32 cache_arg;
496 	sljit_sw cache_argw;
497 #endif
498 
499 #if (defined SLJIT_CONFIG_S390X && SLJIT_CONFIG_S390X)
500 	/* Need to allocate register save area to make calls. */
501 	sljit_s32 mode;
502 #endif
503 
504 #if (defined SLJIT_VERBOSE && SLJIT_VERBOSE)
505 	FILE* verbose;
506 #endif
507 
508 #if (defined SLJIT_ARGUMENT_CHECKS && SLJIT_ARGUMENT_CHECKS) \
509 		|| (defined SLJIT_DEBUG && SLJIT_DEBUG)
510 	/* Flags specified by the last arithmetic instruction.
511 	   It contains the type of the variable flag. */
512 	sljit_s32 last_flags;
513 	/* Return value type set by entry functions. */
514 	sljit_s32 last_return;
515 	/* Local size passed to entry functions. */
516 	sljit_s32 logical_local_size;
517 #endif
518 
519 #if (defined SLJIT_ARGUMENT_CHECKS && SLJIT_ARGUMENT_CHECKS) \
520 		|| (defined SLJIT_DEBUG && SLJIT_DEBUG) \
521 		|| (defined SLJIT_VERBOSE && SLJIT_VERBOSE)
522 	/* Trust arguments when an API function is called.
523 	   Used internally for calling API functions. */
524 	sljit_s32 skip_checks;
525 #endif
526 };
527 
528 /* --------------------------------------------------------------------- */
529 /*  Main functions                                                       */
530 /* --------------------------------------------------------------------- */
531 
532 /* Creates an SLJIT compiler. The allocator_data is required by some
533    custom memory managers. This pointer is passed to SLJIT_MALLOC
534    and SLJIT_FREE macros. Most allocators (including the default
535    one) ignores this value, and it is recommended to pass NULL
536    as a dummy value for allocator_data. The exec_allocator_data
537    has the same purpose but this one is passed to SLJIT_MALLOC_EXEC /
538    SLJIT_MALLOC_FREE functions.
539 
540    Returns NULL if failed. */
541 SLJIT_API_FUNC_ATTRIBUTE struct sljit_compiler* sljit_create_compiler(void *allocator_data, void *exec_allocator_data);
542 
543 /* Frees everything except the compiled machine code. */
544 SLJIT_API_FUNC_ATTRIBUTE void sljit_free_compiler(struct sljit_compiler *compiler);
545 
546 /* Returns the current error code. If an error occurres, future calls
547    which uses the same compiler argument returns early with the same
548    error code. Thus there is no need for checking the error after every
549    call, it is enough to do it after the code is compiled. Removing
550    these checks increases the performance of the compiling process. */
sljit_get_compiler_error(struct sljit_compiler * compiler)551 static SLJIT_INLINE sljit_s32 sljit_get_compiler_error(struct sljit_compiler *compiler) { return compiler->error; }
552 
553 /* Sets the compiler error code to SLJIT_ERR_ALLOC_FAILED except
554    if an error was detected before. After the error code is set
555    the compiler behaves as if the allocation failure happened
556    during an SLJIT function call. This can greatly simplify error
557    checking, since it is enough to check the compiler status
558    after the code is compiled. */
559 SLJIT_API_FUNC_ATTRIBUTE void sljit_set_compiler_memory_error(struct sljit_compiler *compiler);
560 
561 /*
562    Allocate a small amount of memory. The size must be <= 64 bytes on 32 bit,
563    and <= 128 bytes on 64 bit architectures. The memory area is owned by the
564    compiler, and freed by sljit_free_compiler. The returned pointer is
565    sizeof(sljit_sw) aligned. Excellent for allocating small blocks during
566    compiling, and no need to worry about freeing them. The size is enough
567    to contain at most 16 pointers. If the size is outside of the range,
568    the function will return with NULL. However, this return value does not
569    indicate that there is no more memory (does not set the current error code
570    of the compiler to out-of-memory status).
571 */
572 SLJIT_API_FUNC_ATTRIBUTE void* sljit_alloc_memory(struct sljit_compiler *compiler, sljit_s32 size);
573 
574 #if (defined SLJIT_VERBOSE && SLJIT_VERBOSE)
575 /* Passing NULL disables verbose. */
576 SLJIT_API_FUNC_ATTRIBUTE void sljit_compiler_verbose(struct sljit_compiler *compiler, FILE* verbose);
577 #endif
578 
579 /*
580    Create executable code from the instruction stream. This is the final step
581    of the code generation so no more instructions can be emitted after this call.
582 */
583 
584 SLJIT_API_FUNC_ATTRIBUTE void* sljit_generate_code(struct sljit_compiler *compiler);
585 
586 /* Free executable code. */
587 
588 SLJIT_API_FUNC_ATTRIBUTE void sljit_free_code(void* code, void *exec_allocator_data);
589 
590 /*
591    When the protected executable allocator is used the JIT code is mapped
592    twice. The first mapping has read/write and the second mapping has read/exec
593    permissions. This function returns with the relative offset of the executable
594    mapping using the writable mapping as the base after the machine code is
595    successfully generated. The returned value is always 0 for the normal executable
596    allocator, since it uses only one mapping with read/write/exec permissions.
597    Dynamic code modifications requires this value.
598 
599    Before a successful code generation, this function returns with 0.
600 */
sljit_get_executable_offset(struct sljit_compiler * compiler)601 static SLJIT_INLINE sljit_sw sljit_get_executable_offset(struct sljit_compiler *compiler) { return compiler->executable_offset; }
602 
603 /*
604    The executable memory consumption of the generated code can be retrieved by
605    this function. The returned value can be used for statistical purposes.
606 
607    Before a successful code generation, this function returns with 0.
608 */
sljit_get_generated_code_size(struct sljit_compiler * compiler)609 static SLJIT_INLINE sljit_uw sljit_get_generated_code_size(struct sljit_compiler *compiler) { return compiler->executable_size; }
610 
611 /* Returns with non-zero if the feature or limitation type passed as its
612    argument is present on the current CPU. The return value is one, if a
613    feature is fully supported, and it is two, if partially supported.
614 
615    Some features (e.g. floating point operations) require hardware (CPU)
616    support while others (e.g. move with update) are emulated if not available.
617    However, even when a feature is emulated, specialized code paths may be
618    faster than the emulation. Some limitations are emulated as well so their
619    general case is supported but it has extra performance costs. */
620 
621 /* [Not emulated] Floating-point support is available. */
622 #define SLJIT_HAS_FPU			0
623 /* [Limitation] Some registers are virtual registers. */
624 #define SLJIT_HAS_VIRTUAL_REGISTERS	1
625 /* [Emulated] Has zero register (setting a memory location to zero is efficient). */
626 #define SLJIT_HAS_ZERO_REGISTER		2
627 /* [Emulated] Count leading zero is supported. */
628 #define SLJIT_HAS_CLZ			3
629 /* [Emulated] Count trailing zero is supported. */
630 #define SLJIT_HAS_CTZ			4
631 /* [Emulated] Rotate left/right is supported. */
632 #define SLJIT_HAS_ROT			5
633 /* [Emulated] Conditional move is supported. */
634 #define SLJIT_HAS_CMOV			6
635 /* [Emulated] Prefetch instruction is available (emulated as a nop). */
636 #define SLJIT_HAS_PREFETCH		7
637 
638 #if (defined SLJIT_CONFIG_X86 && SLJIT_CONFIG_X86)
639 /* [Not emulated] SSE2 support is available on x86. */
640 #define SLJIT_HAS_SSE2			100
641 #endif
642 
643 SLJIT_API_FUNC_ATTRIBUTE sljit_s32 sljit_has_cpu_feature(sljit_s32 feature_type);
644 
645 /* If type is between SLJIT_ORDERED_EQUAL and SLJIT_ORDERED_LESS_EQUAL,
646    sljit_cmp_info returns one, if the cpu supports the passed floating
647    point comparison type.
648 
649    If type is SLJIT_UNORDERED or SLJIT_ORDERED, sljit_cmp_info returns
650    one, if the cpu supports checking the unordered comparison result
651    regardless of the comparison type passed to the comparison instruction.
652    The returned value is always one, if there is at least one type between
653    SLJIT_ORDERED_EQUAL and SLJIT_ORDERED_LESS_EQUAL where sljit_cmp_info
654    returns with a zero value.
655 
656    Otherwise it returns zero. */
657 SLJIT_API_FUNC_ATTRIBUTE sljit_s32 sljit_cmp_info(sljit_s32 type);
658 
659 /* The following functions generate machine code. If there is no
660    error, they return with SLJIT_SUCCESS, otherwise they return
661    with an error code. */
662 
663 /*
664    The executable code is a function from the viewpoint of the C
665    language. The function calls must obey to the ABI (Application
666    Binary Interface) of the platform, which specify the purpose of
667    machine registers and stack handling among other things. The
668    sljit_emit_enter function emits the necessary instructions for
669    setting up a new context for the executable code. This is often
670    called as function prologue. Furthermore the options argument
671    can be used to pass configuration options to the compiler. The
672    available options are listed before sljit_emit_enter.
673 
674    The function argument list is specified by the SLJIT_ARGSx
675    (SLJIT_ARGS0 .. SLJIT_ARGS4) macros. Currently maximum four
676    arguments are supported. See the description of SLJIT_ARGSx
677    macros about argument passing. Furthermore the register set
678    used by the function must be declared as well. The number of
679    scratch and saved registers available to the function must
680    be passed to sljit_emit_enter. Only R registers between R0
681    and "scratches" argument can be used later. E.g. if "scratches"
682    is set to two, the scratch register set will be limited to
683    SLJIT_R0 and SLJIT_R1. The S registers and the floating point
684    registers ("fscratches" and "fsaveds") are specified in a
685    similar manner. The sljit_emit_enter is also capable of
686    allocating a stack space for local data. The "local_size"
687    argument contains the size in bytes of this local area, and
688    it can be accessed using SLJIT_MEM1(SLJIT_SP). The memory
689    area between SLJIT_SP (inclusive) and SLJIT_SP + local_size
690    (exclusive) can be modified freely until the function returns.
691    The stack space is not initialized to zero.
692 
693    Note: the following conditions must met:
694          0 <= scratches <= SLJIT_NUMBER_OF_REGISTERS
695          0 <= saveds <= SLJIT_NUMBER_OF_SAVED_REGISTERS
696          scratches + saveds <= SLJIT_NUMBER_OF_REGISTERS
697          0 <= fscratches <= SLJIT_NUMBER_OF_FLOAT_REGISTERS
698          0 <= fsaveds <= SLJIT_NUMBER_OF_SAVED_FLOAT_REGISTERS
699          fscratches + fsaveds <= SLJIT_NUMBER_OF_FLOAT_REGISTERS
700 
701    Note: the compiler can use saved registers as scratch registers,
702          but the opposite is not supported
703 
704    Note: every call of sljit_emit_enter and sljit_set_context
705          overwrites the previous context.
706 */
707 
708 /* Saved registers between SLJIT_S0 and SLJIT_S(n - 1) (inclusive)
709    are not saved / restored on function enter / return. Instead,
710    these registers can be used to pass / return data (such as
711    global / local context pointers) across function calls. The
712    value of n must be between 1 and 3. This option is only
713    supported by SLJIT_ENTER_REG_ARG calling convention. */
714 #define SLJIT_ENTER_KEEP(n)	(n)
715 
716 /* The compiled function uses an SLJIT specific register argument
717    calling convention. This is a lightweight function call type where
718    both the caller and the called functions must be compiled by
719    SLJIT. The type argument of the call must be SLJIT_CALL_REG_ARG
720    and all arguments must be stored in scratch registers. */
721 #define SLJIT_ENTER_REG_ARG	0x00000004
722 
723 /* The local_size must be >= 0 and <= SLJIT_MAX_LOCAL_SIZE. */
724 #define SLJIT_MAX_LOCAL_SIZE	65536
725 
726 SLJIT_API_FUNC_ATTRIBUTE sljit_s32 sljit_emit_enter(struct sljit_compiler *compiler,
727 	sljit_s32 options, sljit_s32 arg_types, sljit_s32 scratches, sljit_s32 saveds,
728 	sljit_s32 fscratches, sljit_s32 fsaveds, sljit_s32 local_size);
729 
730 /* The SLJIT compiler has a current context (which contains the local
731    stack space size, number of used registers, etc.) which is initialized
732    by sljit_emit_enter. Several functions (such as sljit_emit_return)
733    requires this context to be able to generate the appropriate code.
734    However, some code fragments (compiled separately) may have no
735    normal entry point so their context is unknown for the compiler.
736 
737    The sljit_set_context and sljit_emit_enter have the same arguments,
738    but sljit_set_context does not generate any machine code.
739 
740    Note: every call of sljit_emit_enter and sljit_set_context overwrites
741          the previous context. */
742 
743 SLJIT_API_FUNC_ATTRIBUTE sljit_s32 sljit_set_context(struct sljit_compiler *compiler,
744 	sljit_s32 options, sljit_s32 arg_types, sljit_s32 scratches, sljit_s32 saveds,
745 	sljit_s32 fscratches, sljit_s32 fsaveds, sljit_s32 local_size);
746 
747 /* Return to the caller function. The sljit_emit_return_void function
748    does not return with any value. The sljit_emit_return function returns
749    with a single value loaded from its source operand. The load operation
750    can be between SLJIT_MOV and SLJIT_MOV_P (see sljit_emit_op1) and
751    SLJIT_MOV_F32/SLJIT_MOV_F64 (see sljit_emit_fop1) depending on the
752    return value specified by sljit_emit_enter/sljit_set_context. */
753 
754 SLJIT_API_FUNC_ATTRIBUTE sljit_s32 sljit_emit_return_void(struct sljit_compiler *compiler);
755 
756 SLJIT_API_FUNC_ATTRIBUTE sljit_s32 sljit_emit_return(struct sljit_compiler *compiler, sljit_s32 op,
757 	sljit_s32 src, sljit_sw srcw);
758 
759 /* Restores the saved registers and free the stack area, then the execution
760    continues from the address specified by the source operand. This
761    operation is similar to sljit_emit_return, but it ignores the return
762    address. The code where the exection continues should use the same context
763    as the caller function (see sljit_set_context). A word (pointer) value
764    can be passed in the SLJIT_RETURN_REG register. This function can be used
765    to jump to exception handlers. */
766 
767 SLJIT_API_FUNC_ATTRIBUTE sljit_s32 sljit_emit_return_to(struct sljit_compiler *compiler,
768 	sljit_s32 src, sljit_sw srcw);
769 
770 /* Generating entry and exit points for fast call functions (see SLJIT_FAST_CALL).
771    Both sljit_emit_fast_enter and SLJIT_FAST_RETURN operations preserve the
772    values of all registers and stack frame. The return address is stored in the
773    dst argument of sljit_emit_fast_enter, and this return address can be passed
774    to SLJIT_FAST_RETURN to continue the execution after the fast call.
775 
776    Fast calls are cheap operations (usually only a single call instruction is
777    emitted) but they do not preserve any registers. However the callee function
778    can freely use / update any registers and the local area which can be
779    efficiently exploited by various optimizations. Registers can be saved
780    and restored manually if needed.
781 
782    Although returning to different address by SLJIT_FAST_RETURN is possible,
783    this address usually cannot be predicted by the return address predictor of
784    modern CPUs which may reduce performance. Furthermore certain security
785    enhancement technologies such as Intel Control-flow Enforcement Technology
786    (CET) may disallow returning to a different address.
787 
788    Flags: - (does not modify flags). */
789 
790 SLJIT_API_FUNC_ATTRIBUTE sljit_s32 sljit_emit_fast_enter(struct sljit_compiler *compiler, sljit_s32 dst, sljit_sw dstw);
791 
792 /*
793    Source and destination operands for arithmetical instructions
794     imm              - a simple immediate value (cannot be used as a destination)
795     reg              - any of the available registers (immediate argument must be 0)
796     [imm]            - absolute memory address
797     [reg+imm]        - indirect memory address
798     [reg+(reg<<imm)] - indirect indexed memory address (shift must be between 0 and 3)
799                        useful for accessing arrays (fully supported by both x86 and
800                        ARM architectures, and cheap operation on others)
801 */
802 
803 /*
804    IMPORTANT NOTE: memory accesses MUST be naturally aligned unless
805                    SLJIT_UNALIGNED macro is defined and its value is 1.
806 
807      length | alignment
808    ---------+-----------
809      byte   | 1 byte (any physical_address is accepted)
810      half   | 2 byte (physical_address & 0x1 == 0)
811      int    | 4 byte (physical_address & 0x3 == 0)
812      word   | 4 byte if SLJIT_32BIT_ARCHITECTURE is defined and its value is 1
813             | 8 byte if SLJIT_64BIT_ARCHITECTURE is defined and its value is 1
814     pointer | size of sljit_p type (4 byte on 32 bit machines, 4 or 8 byte
815             | on 64 bit machines)
816 
817    Note:   Different architectures have different addressing limitations.
818            A single instruction is enough for the following addressing
819            modes. Other adrressing modes are emulated by instruction
820            sequences. This information could help to improve those code
821            generators which focuses only a few architectures.
822 
823    x86:    [reg+imm], -2^32+1 <= imm <= 2^32-1 (full address space on x86-32)
824            [reg+(reg<<imm)] is supported
825            [imm], -2^32+1 <= imm <= 2^32-1 is supported
826            Write-back is not supported
827    arm:    [reg+imm], -4095 <= imm <= 4095 or -255 <= imm <= 255 for signed
828                 bytes, any halfs or floating point values)
829            [reg+(reg<<imm)] is supported
830            Write-back is supported
831    arm-t2: [reg+imm], -255 <= imm <= 4095
832            [reg+(reg<<imm)] is supported
833            Write back is supported only for [reg+imm], where -255 <= imm <= 255
834    arm64:  [reg+imm], -256 <= imm <= 255, 0 <= aligned imm <= 4095 * alignment
835            [reg+(reg<<imm)] is supported
836            Write back is supported only for [reg+imm], where -256 <= imm <= 255
837    ppc:    [reg+imm], -65536 <= imm <= 65535. 64 bit loads/stores and 32 bit
838                 signed load on 64 bit requires immediates divisible by 4.
839                 [reg+imm] is not supported for signed 8 bit values.
840            [reg+reg] is supported
841            Write-back is supported except for one instruction: 32 bit signed
842                 load with [reg+imm] addressing mode on 64 bit.
843    mips:   [reg+imm], -65536 <= imm <= 65535
844            Write-back is not supported
845    riscv:  [reg+imm], -2048 <= imm <= 2047
846            Write-back is not supported
847    s390x:  [reg+imm], -2^19 <= imm < 2^19
848            [reg+reg] is supported
849            Write-back is not supported
850 */
851 
852 /* Macros for specifying operand types. */
853 #define SLJIT_MEM		0x80
854 #define SLJIT_MEM0()		(SLJIT_MEM)
855 #define SLJIT_MEM1(r1)		(SLJIT_MEM | (r1))
856 #define SLJIT_MEM2(r1, r2)	(SLJIT_MEM | (r1) | ((r2) << 8))
857 #define SLJIT_IMM		0x40
858 #define SLJIT_REG_PAIR(r1, r2)	((r1) | ((r2) << 8))
859 
860 /* Sets 32 bit operation mode on 64 bit CPUs. This option is ignored on
861    32 bit CPUs. When this option is set for an arithmetic operation, only
862    the lower 32 bits of the input registers are used, and the CPU status
863    flags are set according to the 32 bit result. Although the higher 32 bit
864    of the input and the result registers are not defined by SLJIT, it might
865    be defined by the CPU architecture (e.g. MIPS). To satisfy these CPU
866    requirements all source registers must be the result of those operations
867    where this option was also set. Memory loads read 32 bit values rather
868    than 64 bit ones. In other words 32 bit and 64 bit operations cannot be
869    mixed. The only exception is SLJIT_MOV32 which source register can hold
870    any 32 or 64 bit value, and it is converted to a 32 bit compatible format
871    first. When the source and destination registers are the same, this
872    conversion is free (no instructions are emitted) on most CPUs. A 32 bit
873    value can also be converted to a 64 bit value by SLJIT_MOV_S32
874    (sign extension) or SLJIT_MOV_U32 (zero extension).
875 
876    As for floating-point operations, this option sets 32 bit single
877    precision mode. Similar to the integer operations, all register arguments
878    must be the result of those operations where this option was also set.
879 
880    Note: memory addressing always uses 64 bit values on 64 bit systems so
881          the result of a 32 bit operation must not be used with SLJIT_MEMx
882          macros.
883 
884    This option is part of the instruction name, so there is no need to
885    manually set it. E.g:
886 
887      SLJIT_ADD32 == (SLJIT_ADD | SLJIT_32) */
888 #define SLJIT_32		0x100
889 
890 /* Many CPUs (x86, ARM, PPC) have status flag bits which can be set according
891    to the result of an operation. Other CPUs (MIPS) do not have status
892    flag bits, and results must be stored in registers. To cover both
893    architecture types efficiently only two flags are defined by SLJIT:
894 
895     * Zero (equal) flag: it is set if the result is zero
896     * Variable flag: its value is defined by the arithmetic operation
897 
898    SLJIT instructions can set any or both of these flags. The value of
899    these flags is undefined if the instruction does not specify their
900    value. The description of each instruction contains the list of
901    allowed flag types.
902 
903    Note: the logical or operation can be used to set flags.
904 
905    Example: SLJIT_ADD can set the Z, OVERFLOW, CARRY flags hence
906 
907      sljit_op2(..., SLJIT_ADD, ...)
908        Both the zero and variable flags are undefined so they can
909        have any value after the operation is completed.
910 
911      sljit_op2(..., SLJIT_ADD | SLJIT_SET_Z, ...)
912        Sets the zero flag if the result is zero, clears it otherwise.
913        The variable flag is undefined.
914 
915      sljit_op2(..., SLJIT_ADD | SLJIT_SET_OVERFLOW, ...)
916        Sets the variable flag if an integer overflow occurs, clears
917        it otherwise. The zero flag is undefined.
918 
919      sljit_op2(..., SLJIT_ADD | SLJIT_SET_Z | SLJIT_SET_CARRY, ...)
920        Sets the zero flag if the result is zero, clears it otherwise.
921        Sets the variable flag if unsigned overflow (carry) occurs,
922        clears it otherwise.
923 
924    Certain instructions (e.g. SLJIT_MOV) does not modify flags, so
925    status flags are unchanged.
926 
927    Example:
928 
929      sljit_op2(..., SLJIT_ADD | SLJIT_SET_Z, ...)
930      sljit_op1(..., SLJIT_MOV, ...)
931        Zero flag is set according to the result of SLJIT_ADD.
932 
933      sljit_op2(..., SLJIT_ADD | SLJIT_SET_Z, ...)
934      sljit_op2(..., SLJIT_ADD, ...)
935        Zero flag has unknown value.
936 
937    These flags can be used for code optimization. E.g. a fast loop can be
938    implemented by decreasing a counter register and set the zero flag
939    using a single instruction. The zero register can be used by a
940    conditional jump to restart the loop. A single comparison can set a
941    zero and less flags to check if a value is less, equal, or greater
942    than another value.
943 
944    Motivation: although some CPUs can set a large number of flag bits,
945    usually their values are ignored or only a few of them are used. Emulating
946    a large number of flags on systems without a flag register is complicated
947    so SLJIT instructions must specify the flag they want to use and only
948    that flag is computed. The last arithmetic instruction can be repeated if
949    multiple flags need to be checked.
950 */
951 
952 /* Set Zero status flag. */
953 #define SLJIT_SET_Z			0x0200
954 /* Set the variable status flag if condition is true.
955    See comparison types (e.g. SLJIT_SET_LESS, SLJIT_SET_F_EQUAL). */
956 #define SLJIT_SET(condition)			((condition) << 10)
957 
958 /* Starting index of opcodes for sljit_emit_op0. */
959 #define SLJIT_OP0_BASE			0
960 
961 /* Flags: - (does not modify flags)
962    Note: breakpoint instruction is not supported by all architectures (e.g. ppc)
963          It falls back to SLJIT_NOP in those cases. */
964 #define SLJIT_BREAKPOINT		(SLJIT_OP0_BASE + 0)
965 /* Flags: - (does not modify flags)
966    Note: may or may not cause an extra cycle wait
967          it can even decrease the runtime in a few cases. */
968 #define SLJIT_NOP			(SLJIT_OP0_BASE + 1)
969 /* Flags: - (may destroy flags)
970    Unsigned multiplication of SLJIT_R0 and SLJIT_R1.
971    Result is placed into SLJIT_R1:SLJIT_R0 (high:low) word */
972 #define SLJIT_LMUL_UW			(SLJIT_OP0_BASE + 2)
973 /* Flags: - (may destroy flags)
974    Signed multiplication of SLJIT_R0 and SLJIT_R1.
975    Result is placed into SLJIT_R1:SLJIT_R0 (high:low) word */
976 #define SLJIT_LMUL_SW			(SLJIT_OP0_BASE + 3)
977 /* Flags: - (may destroy flags)
978    Unsigned divide of the value in SLJIT_R0 by the value in SLJIT_R1.
979    The result is placed into SLJIT_R0 and the remainder into SLJIT_R1.
980    Note: if SLJIT_R1 is 0, the behaviour is undefined. */
981 #define SLJIT_DIVMOD_UW			(SLJIT_OP0_BASE + 4)
982 #define SLJIT_DIVMOD_U32		(SLJIT_DIVMOD_UW | SLJIT_32)
983 /* Flags: - (may destroy flags)
984    Signed divide of the value in SLJIT_R0 by the value in SLJIT_R1.
985    The result is placed into SLJIT_R0 and the remainder into SLJIT_R1.
986    Note: if SLJIT_R1 is 0, the behaviour is undefined.
987    Note: if SLJIT_R1 is -1 and SLJIT_R0 is integer min (0x800..00),
988          the behaviour is undefined. */
989 #define SLJIT_DIVMOD_SW			(SLJIT_OP0_BASE + 5)
990 #define SLJIT_DIVMOD_S32		(SLJIT_DIVMOD_SW | SLJIT_32)
991 /* Flags: - (may destroy flags)
992    Unsigned divide of the value in SLJIT_R0 by the value in SLJIT_R1.
993    The result is placed into SLJIT_R0. SLJIT_R1 preserves its value.
994    Note: if SLJIT_R1 is 0, the behaviour is undefined. */
995 #define SLJIT_DIV_UW			(SLJIT_OP0_BASE + 6)
996 #define SLJIT_DIV_U32			(SLJIT_DIV_UW | SLJIT_32)
997 /* Flags: - (may destroy flags)
998    Signed divide of the value in SLJIT_R0 by the value in SLJIT_R1.
999    The result is placed into SLJIT_R0. SLJIT_R1 preserves its value.
1000    Note: if SLJIT_R1 is 0, the behaviour is undefined.
1001    Note: if SLJIT_R1 is -1 and SLJIT_R0 is integer min (0x800..00),
1002          the behaviour is undefined. */
1003 #define SLJIT_DIV_SW			(SLJIT_OP0_BASE + 7)
1004 #define SLJIT_DIV_S32			(SLJIT_DIV_SW | SLJIT_32)
1005 /* Flags: - (does not modify flags)
1006    ENDBR32 instruction for x86-32 and ENDBR64 instruction for x86-64
1007    when Intel Control-flow Enforcement Technology (CET) is enabled.
1008    No instructions are emitted for other architectures. */
1009 #define SLJIT_ENDBR			(SLJIT_OP0_BASE + 8)
1010 /* Flags: - (may destroy flags)
1011    Skip stack frames before return when Intel Control-flow
1012    Enforcement Technology (CET) is enabled. No instructions
1013    are emitted for other architectures. */
1014 #define SLJIT_SKIP_FRAMES_BEFORE_RETURN	(SLJIT_OP0_BASE + 9)
1015 
1016 SLJIT_API_FUNC_ATTRIBUTE sljit_s32 sljit_emit_op0(struct sljit_compiler *compiler, sljit_s32 op);
1017 
1018 /* Starting index of opcodes for sljit_emit_op1. */
1019 #define SLJIT_OP1_BASE			32
1020 
1021 /* The MOV instruction transfers data from source to destination.
1022 
1023    MOV instruction suffixes:
1024 
1025    U8  - unsigned 8 bit data transfer
1026    S8  - signed 8 bit data transfer
1027    U16 - unsigned 16 bit data transfer
1028    S16 - signed 16 bit data transfer
1029    U32 - unsigned int (32 bit) data transfer
1030    S32 - signed int (32 bit) data transfer
1031    P   - pointer (sljit_p) data transfer
1032 */
1033 
1034 /* Flags: - (does not modify flags) */
1035 #define SLJIT_MOV			(SLJIT_OP1_BASE + 0)
1036 /* Flags: - (does not modify flags) */
1037 #define SLJIT_MOV_U8			(SLJIT_OP1_BASE + 1)
1038 #define SLJIT_MOV32_U8			(SLJIT_MOV_U8 | SLJIT_32)
1039 /* Flags: - (does not modify flags) */
1040 #define SLJIT_MOV_S8			(SLJIT_OP1_BASE + 2)
1041 #define SLJIT_MOV32_S8			(SLJIT_MOV_S8 | SLJIT_32)
1042 /* Flags: - (does not modify flags) */
1043 #define SLJIT_MOV_U16			(SLJIT_OP1_BASE + 3)
1044 #define SLJIT_MOV32_U16			(SLJIT_MOV_U16 | SLJIT_32)
1045 /* Flags: - (does not modify flags) */
1046 #define SLJIT_MOV_S16			(SLJIT_OP1_BASE + 4)
1047 #define SLJIT_MOV32_S16			(SLJIT_MOV_S16 | SLJIT_32)
1048 /* Flags: - (does not modify flags)
1049    Note: no SLJIT_MOV32_U32 form, since it is the same as SLJIT_MOV32 */
1050 #define SLJIT_MOV_U32			(SLJIT_OP1_BASE + 5)
1051 /* Flags: - (does not modify flags)
1052    Note: no SLJIT_MOV32_S32 form, since it is the same as SLJIT_MOV32 */
1053 #define SLJIT_MOV_S32			(SLJIT_OP1_BASE + 6)
1054 /* Flags: - (does not modify flags) */
1055 #define SLJIT_MOV32			(SLJIT_OP1_BASE + 7)
1056 /* Flags: - (does not modify flags)
1057    Note: loads a pointer sized data, useful on x32 mode (a 64 bit mode
1058          on x86-64 which uses 32 bit pointers) or similar compiling modes */
1059 #define SLJIT_MOV_P			(SLJIT_OP1_BASE + 8)
1060 /* Flags: Z
1061    Note: immediate source argument is not supported */
1062 #define SLJIT_NOT			(SLJIT_OP1_BASE + 9)
1063 #define SLJIT_NOT32			(SLJIT_NOT | SLJIT_32)
1064 /* Count leading zeroes
1065    Flags: - (may destroy flags)
1066    Note: immediate source argument is not supported */
1067 #define SLJIT_CLZ			(SLJIT_OP1_BASE + 10)
1068 #define SLJIT_CLZ32			(SLJIT_CLZ | SLJIT_32)
1069 /* Count trailing zeroes
1070    Flags: - (may destroy flags)
1071    Note: immediate source argument is not supported */
1072 #define SLJIT_CTZ			(SLJIT_OP1_BASE + 11)
1073 #define SLJIT_CTZ32			(SLJIT_CTZ | SLJIT_32)
1074 
1075 SLJIT_API_FUNC_ATTRIBUTE sljit_s32 sljit_emit_op1(struct sljit_compiler *compiler, sljit_s32 op,
1076 	sljit_s32 dst, sljit_sw dstw,
1077 	sljit_s32 src, sljit_sw srcw);
1078 
1079 /* Starting index of opcodes for sljit_emit_op2. */
1080 #define SLJIT_OP2_BASE			96
1081 
1082 /* Flags: Z | OVERFLOW | CARRY */
1083 #define SLJIT_ADD			(SLJIT_OP2_BASE + 0)
1084 #define SLJIT_ADD32			(SLJIT_ADD | SLJIT_32)
1085 /* Flags: CARRY */
1086 #define SLJIT_ADDC			(SLJIT_OP2_BASE + 1)
1087 #define SLJIT_ADDC32			(SLJIT_ADDC | SLJIT_32)
1088 /* Flags: Z | LESS | GREATER_EQUAL | GREATER | LESS_EQUAL
1089           SIG_LESS | SIG_GREATER_EQUAL | SIG_GREATER
1090           SIG_LESS_EQUAL | OVERFLOW | CARRY */
1091 #define SLJIT_SUB			(SLJIT_OP2_BASE + 2)
1092 #define SLJIT_SUB32			(SLJIT_SUB | SLJIT_32)
1093 /* Flags: CARRY */
1094 #define SLJIT_SUBC			(SLJIT_OP2_BASE + 3)
1095 #define SLJIT_SUBC32			(SLJIT_SUBC | SLJIT_32)
1096 /* Note: integer mul
1097    Flags: OVERFLOW */
1098 #define SLJIT_MUL			(SLJIT_OP2_BASE + 4)
1099 #define SLJIT_MUL32			(SLJIT_MUL | SLJIT_32)
1100 /* Flags: Z */
1101 #define SLJIT_AND			(SLJIT_OP2_BASE + 5)
1102 #define SLJIT_AND32			(SLJIT_AND | SLJIT_32)
1103 /* Flags: Z */
1104 #define SLJIT_OR			(SLJIT_OP2_BASE + 6)
1105 #define SLJIT_OR32			(SLJIT_OR | SLJIT_32)
1106 /* Flags: Z */
1107 #define SLJIT_XOR			(SLJIT_OP2_BASE + 7)
1108 #define SLJIT_XOR32			(SLJIT_XOR | SLJIT_32)
1109 /* Flags: Z
1110    Let bit_length be the length of the shift operation: 32 or 64.
1111    If src2 is immediate, src2w is masked by (bit_length - 1).
1112    Otherwise, if the content of src2 is outside the range from 0
1113    to bit_length - 1, the result is undefined. */
1114 #define SLJIT_SHL			(SLJIT_OP2_BASE + 8)
1115 #define SLJIT_SHL32			(SLJIT_SHL | SLJIT_32)
1116 /* Flags: Z
1117    Same as SLJIT_SHL, except the the second operand is
1118    always masked by the length of the shift operation. */
1119 #define SLJIT_MSHL			(SLJIT_OP2_BASE + 9)
1120 #define SLJIT_MSHL32			(SLJIT_MSHL | SLJIT_32)
1121 /* Flags: Z
1122    Let bit_length be the length of the shift operation: 32 or 64.
1123    If src2 is immediate, src2w is masked by (bit_length - 1).
1124    Otherwise, if the content of src2 is outside the range from 0
1125    to bit_length - 1, the result is undefined. */
1126 #define SLJIT_LSHR			(SLJIT_OP2_BASE + 10)
1127 #define SLJIT_LSHR32			(SLJIT_LSHR | SLJIT_32)
1128 /* Flags: Z
1129    Same as SLJIT_LSHR, except the the second operand is
1130    always masked by the length of the shift operation. */
1131 #define SLJIT_MLSHR			(SLJIT_OP2_BASE + 11)
1132 #define SLJIT_MLSHR32			(SLJIT_MLSHR | SLJIT_32)
1133 /* Flags: Z
1134    Let bit_length be the length of the shift operation: 32 or 64.
1135    If src2 is immediate, src2w is masked by (bit_length - 1).
1136    Otherwise, if the content of src2 is outside the range from 0
1137    to bit_length - 1, the result is undefined. */
1138 #define SLJIT_ASHR			(SLJIT_OP2_BASE + 12)
1139 #define SLJIT_ASHR32			(SLJIT_ASHR | SLJIT_32)
1140 /* Flags: Z
1141    Same as SLJIT_ASHR, except the the second operand is
1142    always masked by the length of the shift operation. */
1143 #define SLJIT_MASHR			(SLJIT_OP2_BASE + 13)
1144 #define SLJIT_MASHR32			(SLJIT_MASHR | SLJIT_32)
1145 /* Flags: - (may destroy flags)
1146    Let bit_length be the length of the rotate operation: 32 or 64.
1147    The second operand is always masked by (bit_length - 1). */
1148 #define SLJIT_ROTL			(SLJIT_OP2_BASE + 14)
1149 #define SLJIT_ROTL32			(SLJIT_ROTL | SLJIT_32)
1150 /* Flags: - (may destroy flags)
1151    Let bit_length be the length of the rotate operation: 32 or 64.
1152    The second operand is always masked by (bit_length - 1). */
1153 #define SLJIT_ROTR			(SLJIT_OP2_BASE + 15)
1154 #define SLJIT_ROTR32			(SLJIT_ROTR | SLJIT_32)
1155 
1156 SLJIT_API_FUNC_ATTRIBUTE sljit_s32 sljit_emit_op2(struct sljit_compiler *compiler, sljit_s32 op,
1157 	sljit_s32 dst, sljit_sw dstw,
1158 	sljit_s32 src1, sljit_sw src1w,
1159 	sljit_s32 src2, sljit_sw src2w);
1160 
1161 /* The sljit_emit_op2u function is the same as sljit_emit_op2
1162    except the result is discarded. */
1163 
1164 SLJIT_API_FUNC_ATTRIBUTE sljit_s32 sljit_emit_op2u(struct sljit_compiler *compiler, sljit_s32 op,
1165 	sljit_s32 src1, sljit_sw src1w,
1166 	sljit_s32 src2, sljit_sw src2w);
1167 
1168 /* Emit a left or right shift operation, where the bits shifted
1169    in comes from a separate source operand. All operands are
1170    interpreted as unsigned integers.
1171 
1172    In the followings the value_mask variable is 31 for 32 bit
1173      operations and word_size - 1 otherwise.
1174 
1175    op must be one of the following operations:
1176      SLJIT_SHL or SLJIT_SHL32:
1177        src_dst <<= src2
1178        src_dst |= ((src1 >> 1) >> (src2 ^ value_mask))
1179      SLJIT_MSHL or SLJIT_MSHL32:
1180        src2 &= value_mask
1181        perform the SLJIT_SHL or SLJIT_SHL32 operation
1182      SLJIT_LSHR or SLJIT_LSHR32:
1183        src_dst >>= src2
1184        src_dst |= ((src1 << 1) << (src2 ^ value_mask))
1185      SLJIT_MLSHR or SLJIT_MLSHR32:
1186        src2 &= value_mask
1187        perform the SLJIT_LSHR or SLJIT_LSHR32 operation
1188 
1189    op can be combined (or'ed) with SLJIT_SHIFT_INTO_NON_ZERO
1190 
1191    src_dst must be a register which content is updated after
1192      the operation is completed
1193    src1 / src1w contains the bits which shifted into src_dst
1194    src2 / src2w contains the shift amount
1195 
1196    Note: a rotate operation can be performed if src_dst and
1197          src1 are set to the same register
1198 
1199    Flags: - (may destroy flags) */
1200 
1201 /* The src2 contains a non-zero value. Improves the generated
1202    code on certain architectures, which provides a small
1203    performance improvement. */
1204 #define SLJIT_SHIFT_INTO_NON_ZERO	0x200
1205 
1206 SLJIT_API_FUNC_ATTRIBUTE sljit_s32 sljit_emit_shift_into(struct sljit_compiler *compiler, sljit_s32 op,
1207 	sljit_s32 src_dst,
1208 	sljit_s32 src1, sljit_sw src1w,
1209 	sljit_s32 src2, sljit_sw src2w);
1210 
1211 /* Starting index of opcodes for sljit_emit_op2. */
1212 #define SLJIT_OP_SRC_BASE		128
1213 
1214 /* Note: src cannot be an immedate value
1215    Flags: - (does not modify flags) */
1216 #define SLJIT_FAST_RETURN		(SLJIT_OP_SRC_BASE + 0)
1217 /* Skip stack frames before fast return.
1218    Note: src cannot be an immedate value
1219    Flags: may destroy flags. */
1220 #define SLJIT_SKIP_FRAMES_BEFORE_FAST_RETURN	(SLJIT_OP_SRC_BASE + 1)
1221 /* Prefetch value into the level 1 data cache
1222    Note: if the target CPU does not support data prefetch,
1223          no instructions are emitted.
1224    Note: this instruction never fails, even if the memory address is invalid.
1225    Flags: - (does not modify flags) */
1226 #define SLJIT_PREFETCH_L1		(SLJIT_OP_SRC_BASE + 2)
1227 /* Prefetch value into the level 2 data cache
1228    Note: same as SLJIT_PREFETCH_L1 if the target CPU
1229          does not support this instruction form.
1230    Note: this instruction never fails, even if the memory address is invalid.
1231    Flags: - (does not modify flags) */
1232 #define SLJIT_PREFETCH_L2		(SLJIT_OP_SRC_BASE + 3)
1233 /* Prefetch value into the level 3 data cache
1234    Note: same as SLJIT_PREFETCH_L2 if the target CPU
1235          does not support this instruction form.
1236    Note: this instruction never fails, even if the memory address is invalid.
1237    Flags: - (does not modify flags) */
1238 #define SLJIT_PREFETCH_L3		(SLJIT_OP_SRC_BASE + 4)
1239 /* Prefetch a value which is only used once (and can be discarded afterwards)
1240    Note: same as SLJIT_PREFETCH_L1 if the target CPU
1241          does not support this instruction form.
1242    Note: this instruction never fails, even if the memory address is invalid.
1243    Flags: - (does not modify flags) */
1244 #define SLJIT_PREFETCH_ONCE		(SLJIT_OP_SRC_BASE + 5)
1245 
1246 SLJIT_API_FUNC_ATTRIBUTE sljit_s32 sljit_emit_op_src(struct sljit_compiler *compiler, sljit_s32 op,
1247 	sljit_s32 src, sljit_sw srcw);
1248 
1249 /* Starting index of opcodes for sljit_emit_fop1. */
1250 #define SLJIT_FOP1_BASE			160
1251 
1252 /* Flags: - (does not modify flags) */
1253 #define SLJIT_MOV_F64			(SLJIT_FOP1_BASE + 0)
1254 #define SLJIT_MOV_F32			(SLJIT_MOV_F64 | SLJIT_32)
1255 /* Convert opcodes: CONV[DST_TYPE].FROM[SRC_TYPE]
1256    SRC/DST TYPE can be: F64, F32, S32, SW
1257    Rounding mode when the destination is SW or S32: round towards zero. */
1258 /* Flags: - (may destroy flags) */
1259 #define SLJIT_CONV_F64_FROM_F32		(SLJIT_FOP1_BASE + 1)
1260 #define SLJIT_CONV_F32_FROM_F64		(SLJIT_CONV_F64_FROM_F32 | SLJIT_32)
1261 /* Flags: - (may destroy flags) */
1262 #define SLJIT_CONV_SW_FROM_F64		(SLJIT_FOP1_BASE + 2)
1263 #define SLJIT_CONV_SW_FROM_F32		(SLJIT_CONV_SW_FROM_F64 | SLJIT_32)
1264 /* Flags: - (may destroy flags) */
1265 #define SLJIT_CONV_S32_FROM_F64		(SLJIT_FOP1_BASE + 3)
1266 #define SLJIT_CONV_S32_FROM_F32		(SLJIT_CONV_S32_FROM_F64 | SLJIT_32)
1267 /* Flags: - (may destroy flags) */
1268 #define SLJIT_CONV_F64_FROM_SW		(SLJIT_FOP1_BASE + 4)
1269 #define SLJIT_CONV_F32_FROM_SW		(SLJIT_CONV_F64_FROM_SW | SLJIT_32)
1270 /* Flags: - (may destroy flags) */
1271 #define SLJIT_CONV_F64_FROM_S32		(SLJIT_FOP1_BASE + 5)
1272 #define SLJIT_CONV_F32_FROM_S32		(SLJIT_CONV_F64_FROM_S32 | SLJIT_32)
1273 /* Note: dst is the left and src is the right operand for SLJIT_CMP_F32/64.
1274    Flags: EQUAL_F | LESS_F | GREATER_EQUAL_F | GREATER_F | LESS_EQUAL_F */
1275 #define SLJIT_CMP_F64			(SLJIT_FOP1_BASE + 6)
1276 #define SLJIT_CMP_F32			(SLJIT_CMP_F64 | SLJIT_32)
1277 /* Flags: - (may destroy flags) */
1278 #define SLJIT_NEG_F64			(SLJIT_FOP1_BASE + 7)
1279 #define SLJIT_NEG_F32			(SLJIT_NEG_F64 | SLJIT_32)
1280 /* Flags: - (may destroy flags) */
1281 #define SLJIT_ABS_F64			(SLJIT_FOP1_BASE + 8)
1282 #define SLJIT_ABS_F32			(SLJIT_ABS_F64 | SLJIT_32)
1283 
1284 SLJIT_API_FUNC_ATTRIBUTE sljit_s32 sljit_emit_fop1(struct sljit_compiler *compiler, sljit_s32 op,
1285 	sljit_s32 dst, sljit_sw dstw,
1286 	sljit_s32 src, sljit_sw srcw);
1287 
1288 /* Starting index of opcodes for sljit_emit_fop2. */
1289 #define SLJIT_FOP2_BASE			192
1290 
1291 /* Flags: - (may destroy flags) */
1292 #define SLJIT_ADD_F64			(SLJIT_FOP2_BASE + 0)
1293 #define SLJIT_ADD_F32			(SLJIT_ADD_F64 | SLJIT_32)
1294 /* Flags: - (may destroy flags) */
1295 #define SLJIT_SUB_F64			(SLJIT_FOP2_BASE + 1)
1296 #define SLJIT_SUB_F32			(SLJIT_SUB_F64 | SLJIT_32)
1297 /* Flags: - (may destroy flags) */
1298 #define SLJIT_MUL_F64			(SLJIT_FOP2_BASE + 2)
1299 #define SLJIT_MUL_F32			(SLJIT_MUL_F64 | SLJIT_32)
1300 /* Flags: - (may destroy flags) */
1301 #define SLJIT_DIV_F64			(SLJIT_FOP2_BASE + 3)
1302 #define SLJIT_DIV_F32			(SLJIT_DIV_F64 | SLJIT_32)
1303 
1304 SLJIT_API_FUNC_ATTRIBUTE sljit_s32 sljit_emit_fop2(struct sljit_compiler *compiler, sljit_s32 op,
1305 	sljit_s32 dst, sljit_sw dstw,
1306 	sljit_s32 src1, sljit_sw src1w,
1307 	sljit_s32 src2, sljit_sw src2w);
1308 
1309 /* Label and jump instructions. */
1310 
1311 SLJIT_API_FUNC_ATTRIBUTE struct sljit_label* sljit_emit_label(struct sljit_compiler *compiler);
1312 
1313 /* Invert (negate) conditional type: xor (^) with 0x1 */
1314 
1315 /* Integer comparison types. */
1316 #define SLJIT_EQUAL			0
1317 #define SLJIT_ZERO			SLJIT_EQUAL
1318 #define SLJIT_NOT_EQUAL			1
1319 #define SLJIT_NOT_ZERO			SLJIT_NOT_EQUAL
1320 
1321 #define SLJIT_LESS			2
1322 #define SLJIT_SET_LESS			SLJIT_SET(SLJIT_LESS)
1323 #define SLJIT_GREATER_EQUAL		3
1324 #define SLJIT_SET_GREATER_EQUAL		SLJIT_SET(SLJIT_GREATER_EQUAL)
1325 #define SLJIT_GREATER			4
1326 #define SLJIT_SET_GREATER		SLJIT_SET(SLJIT_GREATER)
1327 #define SLJIT_LESS_EQUAL		5
1328 #define SLJIT_SET_LESS_EQUAL		SLJIT_SET(SLJIT_LESS_EQUAL)
1329 #define SLJIT_SIG_LESS			6
1330 #define SLJIT_SET_SIG_LESS		SLJIT_SET(SLJIT_SIG_LESS)
1331 #define SLJIT_SIG_GREATER_EQUAL		7
1332 #define SLJIT_SET_SIG_GREATER_EQUAL	SLJIT_SET(SLJIT_SIG_GREATER_EQUAL)
1333 #define SLJIT_SIG_GREATER		8
1334 #define SLJIT_SET_SIG_GREATER		SLJIT_SET(SLJIT_SIG_GREATER)
1335 #define SLJIT_SIG_LESS_EQUAL		9
1336 #define SLJIT_SET_SIG_LESS_EQUAL	SLJIT_SET(SLJIT_SIG_LESS_EQUAL)
1337 
1338 #define SLJIT_OVERFLOW			10
1339 #define SLJIT_SET_OVERFLOW		SLJIT_SET(SLJIT_OVERFLOW)
1340 #define SLJIT_NOT_OVERFLOW		11
1341 
1342 /* Unlike other flags, sljit_emit_jump may destroy the carry flag. */
1343 #define SLJIT_CARRY			12
1344 #define SLJIT_SET_CARRY			SLJIT_SET(SLJIT_CARRY)
1345 #define SLJIT_NOT_CARRY			13
1346 
1347 /* Basic floating point comparison types.
1348 
1349    Note: when the comparison result is unordered, their behaviour is unspecified. */
1350 
1351 #define SLJIT_F_EQUAL				14
1352 #define SLJIT_SET_F_EQUAL			SLJIT_SET(SLJIT_F_EQUAL)
1353 #define SLJIT_F_NOT_EQUAL			15
1354 #define SLJIT_SET_F_NOT_EQUAL			SLJIT_SET(SLJIT_F_NOT_EQUAL)
1355 #define SLJIT_F_LESS				16
1356 #define SLJIT_SET_F_LESS			SLJIT_SET(SLJIT_F_LESS)
1357 #define SLJIT_F_GREATER_EQUAL			17
1358 #define SLJIT_SET_F_GREATER_EQUAL		SLJIT_SET(SLJIT_F_GREATER_EQUAL)
1359 #define SLJIT_F_GREATER				18
1360 #define SLJIT_SET_F_GREATER			SLJIT_SET(SLJIT_F_GREATER)
1361 #define SLJIT_F_LESS_EQUAL			19
1362 #define SLJIT_SET_F_LESS_EQUAL			SLJIT_SET(SLJIT_F_LESS_EQUAL)
1363 
1364 /* Jumps when either argument contains a NaN value. */
1365 #define SLJIT_UNORDERED				20
1366 #define SLJIT_SET_UNORDERED			SLJIT_SET(SLJIT_UNORDERED)
1367 /* Jumps when neither argument contains a NaN value. */
1368 #define SLJIT_ORDERED				21
1369 #define SLJIT_SET_ORDERED			SLJIT_SET(SLJIT_ORDERED)
1370 
1371 /* Ordered / unordered floating point comparison types.
1372 
1373    Note: each comparison type has an ordered and unordered form. Some
1374          architectures supports only either of them (see: sljit_cmp_info). */
1375 
1376 #define SLJIT_ORDERED_EQUAL			22
1377 #define SLJIT_SET_ORDERED_EQUAL			SLJIT_SET(SLJIT_ORDERED_EQUAL)
1378 #define SLJIT_UNORDERED_OR_NOT_EQUAL		23
1379 #define SLJIT_SET_UNORDERED_OR_NOT_EQUAL	SLJIT_SET(SLJIT_UNORDERED_OR_NOT_EQUAL)
1380 #define SLJIT_ORDERED_LESS			24
1381 #define SLJIT_SET_ORDERED_LESS			SLJIT_SET(SLJIT_ORDERED_LESS)
1382 #define SLJIT_UNORDERED_OR_GREATER_EQUAL	25
1383 #define SLJIT_SET_UNORDERED_OR_GREATER_EQUAL	SLJIT_SET(SLJIT_UNORDERED_OR_GREATER_EQUAL)
1384 #define SLJIT_ORDERED_GREATER			26
1385 #define SLJIT_SET_ORDERED_GREATER		SLJIT_SET(SLJIT_ORDERED_GREATER)
1386 #define SLJIT_UNORDERED_OR_LESS_EQUAL		27
1387 #define SLJIT_SET_UNORDERED_OR_LESS_EQUAL	SLJIT_SET(SLJIT_UNORDERED_OR_LESS_EQUAL)
1388 
1389 #define SLJIT_UNORDERED_OR_EQUAL		28
1390 #define SLJIT_SET_UNORDERED_OR_EQUAL		SLJIT_SET(SLJIT_UNORDERED_OR_EQUAL)
1391 #define SLJIT_ORDERED_NOT_EQUAL			29
1392 #define SLJIT_SET_ORDERED_NOT_EQUAL		SLJIT_SET(SLJIT_ORDERED_NOT_EQUAL)
1393 #define SLJIT_UNORDERED_OR_LESS			30
1394 #define SLJIT_SET_UNORDERED_OR_LESS		SLJIT_SET(SLJIT_UNORDERED_OR_LESS)
1395 #define SLJIT_ORDERED_GREATER_EQUAL		31
1396 #define SLJIT_SET_ORDERED_GREATER_EQUAL		SLJIT_SET(SLJIT_ORDERED_GREATER_EQUAL)
1397 #define SLJIT_UNORDERED_OR_GREATER		32
1398 #define SLJIT_SET_UNORDERED_OR_GREATER		SLJIT_SET(SLJIT_UNORDERED_OR_GREATER)
1399 #define SLJIT_ORDERED_LESS_EQUAL		33
1400 #define SLJIT_SET_ORDERED_LESS_EQUAL		SLJIT_SET(SLJIT_ORDERED_LESS_EQUAL)
1401 
1402 /* Unconditional jump types. */
1403 #define SLJIT_JUMP			34
1404 /* Fast calling method. See sljit_emit_fast_enter / SLJIT_FAST_RETURN. */
1405 #define SLJIT_FAST_CALL			35
1406 /* Default C calling convention. */
1407 #define SLJIT_CALL			36
1408 /* Called function must be compiled by SLJIT.
1409    See SLJIT_ENTER_REG_ARG option. */
1410 #define SLJIT_CALL_REG_ARG		37
1411 
1412 /* The target can be changed during runtime (see: sljit_set_jump_addr). */
1413 #define SLJIT_REWRITABLE_JUMP		0x1000
1414 /* When this flag is passed, the execution of the current function ends and
1415    the called function returns to the caller of the current function. The
1416    stack usage is reduced before the call, but it is not necessarily reduced
1417    to zero. In the latter case the compiler needs to allocate space for some
1418    arguments and the return address must be stored on the stack as well. */
1419 #define SLJIT_CALL_RETURN		0x2000
1420 
1421 /* Emit a jump instruction. The destination is not set, only the type of the jump.
1422     type must be between SLJIT_EQUAL and SLJIT_FAST_CALL
1423     type can be combined (or'ed) with SLJIT_REWRITABLE_JUMP
1424 
1425    Flags: does not modify flags. */
1426 SLJIT_API_FUNC_ATTRIBUTE struct sljit_jump* sljit_emit_jump(struct sljit_compiler *compiler, sljit_s32 type);
1427 
1428 /* Emit a C compiler (ABI) compatible function call.
1429     type must be SLJIT_CALL or SLJIT_CALL_REG_ARG
1430     type can be combined (or'ed) with SLJIT_REWRITABLE_JUMP and/or SLJIT_CALL_RETURN
1431     arg_types can be specified by SLJIT_ARGSx (SLJIT_ARG_RETURN / SLJIT_ARG_VALUE) macros
1432 
1433    Flags: destroy all flags. */
1434 SLJIT_API_FUNC_ATTRIBUTE struct sljit_jump* sljit_emit_call(struct sljit_compiler *compiler, sljit_s32 type, sljit_s32 arg_types);
1435 
1436 /* Basic arithmetic comparison. In most architectures it is implemented as
1437    a compare operation followed by a sljit_emit_jump. However some
1438    architectures (i.e: ARM64 or MIPS) may employ special optimizations
1439    here. It is suggested to use this comparison form when appropriate.
1440     type must be between SLJIT_EQUAL and SLJIT_SIG_LESS_EQUAL
1441     type can be combined (or'ed) with SLJIT_REWRITABLE_JUMP
1442 
1443    Flags: may destroy flags. */
1444 SLJIT_API_FUNC_ATTRIBUTE struct sljit_jump* sljit_emit_cmp(struct sljit_compiler *compiler, sljit_s32 type,
1445 	sljit_s32 src1, sljit_sw src1w,
1446 	sljit_s32 src2, sljit_sw src2w);
1447 
1448 /* Basic floating point comparison. In most architectures it is implemented as
1449    a SLJIT_CMP_F32/64 operation (setting appropriate flags) followed by a
1450    sljit_emit_jump. However some architectures (i.e: MIPS) may employ
1451    special optimizations here. It is suggested to use this comparison form
1452    when appropriate.
1453     type must be between SLJIT_F_EQUAL and SLJIT_ORDERED_LESS_EQUAL
1454     type can be combined (or'ed) with SLJIT_REWRITABLE_JUMP
1455    Flags: destroy flags.
1456    Note: when an operand is NaN the behaviour depends on the comparison type. */
1457 SLJIT_API_FUNC_ATTRIBUTE struct sljit_jump* sljit_emit_fcmp(struct sljit_compiler *compiler, sljit_s32 type,
1458 	sljit_s32 src1, sljit_sw src1w,
1459 	sljit_s32 src2, sljit_sw src2w);
1460 
1461 /* Set the destination of the jump to this label. */
1462 SLJIT_API_FUNC_ATTRIBUTE void sljit_set_label(struct sljit_jump *jump, struct sljit_label* label);
1463 /* Set the destination address of the jump to this label. */
1464 SLJIT_API_FUNC_ATTRIBUTE void sljit_set_target(struct sljit_jump *jump, sljit_uw target);
1465 
1466 /* Emit an indirect jump or fast call.
1467    Direct form: set src to SLJIT_IMM() and srcw to the address
1468    Indirect form: any other valid addressing mode
1469     type must be between SLJIT_JUMP and SLJIT_FAST_CALL
1470 
1471    Flags: does not modify flags. */
1472 SLJIT_API_FUNC_ATTRIBUTE sljit_s32 sljit_emit_ijump(struct sljit_compiler *compiler, sljit_s32 type, sljit_s32 src, sljit_sw srcw);
1473 
1474 /* Emit a C compiler (ABI) compatible function call.
1475    Direct form: set src to SLJIT_IMM() and srcw to the address
1476    Indirect form: any other valid addressing mode
1477     type must be SLJIT_CALL or SLJIT_CALL_REG_ARG
1478     type can be combined (or'ed) with SLJIT_CALL_RETURN
1479     arg_types can be specified by SLJIT_ARGSx (SLJIT_ARG_RETURN / SLJIT_ARG_VALUE) macros
1480 
1481    Flags: destroy all flags. */
1482 SLJIT_API_FUNC_ATTRIBUTE sljit_s32 sljit_emit_icall(struct sljit_compiler *compiler, sljit_s32 type, sljit_s32 arg_types, sljit_s32 src, sljit_sw srcw);
1483 
1484 /* Perform an operation using the conditional flags as the second argument.
1485    Type must always be between SLJIT_EQUAL and SLJIT_ORDERED_LESS_EQUAL.
1486    The value represented by the type is 1, if the condition represented
1487    by the type is fulfilled, and 0 otherwise.
1488 
1489    When op is SLJIT_MOV or SLJIT_MOV32:
1490      Set dst to the value represented by the type (0 or 1).
1491      Flags: - (does not modify flags)
1492    When op is SLJIT_AND, SLJIT_AND32, SLJIT_OR, SLJIT_OR32, SLJIT_XOR, or SLJIT_XOR32
1493      Performs the binary operation using dst as the first, and the value
1494      represented by type as the second argument. Result is written into dst.
1495      Flags: Z (may destroy flags) */
1496 SLJIT_API_FUNC_ATTRIBUTE sljit_s32 sljit_emit_op_flags(struct sljit_compiler *compiler, sljit_s32 op,
1497 	sljit_s32 dst, sljit_sw dstw,
1498 	sljit_s32 type);
1499 
1500 /* Emit a conditional mov instruction which moves source to destination,
1501    if the condition is satisfied. Unlike other arithmetic operations this
1502    instruction does not support memory access.
1503 
1504    type must be between SLJIT_EQUAL and SLJIT_ORDERED_LESS_EQUAL
1505    type can be combined (or'ed) with SLJIT_32
1506    dst_reg must be a valid register
1507    src must be a valid register or immediate (SLJIT_IMM)
1508 
1509    Flags: - (does not modify flags) */
1510 SLJIT_API_FUNC_ATTRIBUTE sljit_s32 sljit_emit_cmov(struct sljit_compiler *compiler, sljit_s32 type,
1511 	sljit_s32 dst_reg,
1512 	sljit_s32 src, sljit_sw srcw);
1513 
1514 /* The following flags are used by sljit_emit_mem(), sljit_emit_mem_update(),
1515    sljit_emit_fmem(), and sljit_emit_fmem_update(). */
1516 
1517 /* Memory load operation. This is the default. */
1518 #define SLJIT_MEM_LOAD		0x000000
1519 /* Memory store operation. */
1520 #define SLJIT_MEM_STORE		0x000200
1521 
1522 /* The following flags are used by sljit_emit_mem() and sljit_emit_fmem(). */
1523 
1524 /* Load or stora data from an unaligned (byte aligned) address. */
1525 #define SLJIT_MEM_UNALIGNED	0x000400
1526 /* Load or stora data from a 16 bit aligned address. */
1527 #define SLJIT_MEM_UNALIGNED_16	0x000800
1528 /* Load or stora data from a 32 bit aligned address. */
1529 #define SLJIT_MEM_UNALIGNED_32	0x001000
1530 
1531 /* The following flags are used by sljit_emit_mem_update(),
1532    and sljit_emit_fmem_update(). */
1533 
1534 /* Base register is updated before the memory access (default). */
1535 #define SLJIT_MEM_PRE		0x000000
1536 /* Base register is updated after the memory access. */
1537 #define SLJIT_MEM_POST		0x000400
1538 
1539 /* When SLJIT_MEM_SUPP is passed, no instructions are emitted.
1540    Instead the function returns with SLJIT_SUCCESS if the instruction
1541    form is supported and SLJIT_ERR_UNSUPPORTED otherwise. This flag
1542    allows runtime checking of available instruction forms. */
1543 #define SLJIT_MEM_SUPP		0x000800
1544 
1545 /* The sljit_emit_mem emits instructions for various memory operations:
1546 
1547    When SLJIT_MEM_UNALIGNED / SLJIT_MEM_UNALIGNED_16 /
1548         SLJIT_MEM_UNALIGNED_32 is set in type argument:
1549      Emit instructions for unaligned memory loads or stores. When
1550      SLJIT_UNALIGNED is not defined, the only way to access unaligned
1551      memory data is using sljit_emit_mem. Otherwise all operations (e.g.
1552      sljit_emit_op1/2, or sljit_emit_fop1/2) supports unaligned access.
1553      In general, the performance of unaligned memory accesses are often
1554      lower than aligned and should be avoided.
1555 
1556    When a pair of registers is passed in reg argument:
1557      Emit instructions for moving data between a register pair and
1558      memory. The register pair can be specified by the SLJIT_REG_PAIR
1559      macro. The first register is loaded from or stored into the
1560      location specified by the mem/memw arguments, and the end address
1561      of this operation is the starting address of the data transfer
1562      between the second register and memory. The type argument must
1563      be SLJIT_MOV. The SLJIT_MEM_UNALIGNED* options are allowed for
1564      this operation.
1565 
1566    type must be between SLJIT_MOV and SLJIT_MOV_P and can be
1567      combined (or'ed) with SLJIT_MEM_* flags
1568    reg is a register or register pair, which is the source or
1569      destination of the operation
1570    mem must be a memory operand
1571 
1572    Flags: - (does not modify flags) */
1573 SLJIT_API_FUNC_ATTRIBUTE sljit_s32 sljit_emit_mem(struct sljit_compiler *compiler, sljit_s32 type,
1574 	sljit_s32 reg,
1575 	sljit_s32 mem, sljit_sw memw);
1576 
1577 /* Emit a single memory load or store with update instruction.
1578    When the requested instruction form is not supported by the CPU,
1579    it returns with SLJIT_ERR_UNSUPPORTED instead of emulating the
1580    instruction. This allows specializing tight loops based on
1581    the supported instruction forms (see SLJIT_MEM_SUPP flag).
1582    Absolute address (SLJIT_MEM0) forms are never supported
1583    and the base (first) register specified by the mem argument
1584    must not be SLJIT_SP and must also be different from the
1585    register specified by the reg argument.
1586 
1587    type must be between SLJIT_MOV and SLJIT_MOV_P and can be
1588      combined (or'ed) with SLJIT_MEM_* flags
1589    reg is the source or destination register of the operation
1590    mem must be a memory operand
1591 
1592    Flags: - (does not modify flags) */
1593 
1594 SLJIT_API_FUNC_ATTRIBUTE sljit_s32 sljit_emit_mem_update(struct sljit_compiler *compiler, sljit_s32 type,
1595 	sljit_s32 reg,
1596 	sljit_s32 mem, sljit_sw memw);
1597 
1598 /* Same as sljit_emit_mem except the followings:
1599 
1600    Loading or storing a pair of registers is not supported.
1601 
1602    type must be SLJIT_MOV_F64 or SLJIT_MOV_F32 and can be
1603      combined (or'ed) with SLJIT_MEM_* flags.
1604    freg is the source or destination floating point register
1605      of the operation
1606    mem must be a memory operand
1607 
1608    Flags: - (does not modify flags) */
1609 
1610 SLJIT_API_FUNC_ATTRIBUTE sljit_s32 sljit_emit_fmem(struct sljit_compiler *compiler, sljit_s32 type,
1611 	sljit_s32 freg,
1612 	sljit_s32 mem, sljit_sw memw);
1613 
1614 /* Same as sljit_emit_mem_update except the followings:
1615 
1616    type must be SLJIT_MOV_F64 or SLJIT_MOV_F32 and can be
1617      combined (or'ed) with SLJIT_MEM_* flags
1618    freg is the source or destination floating point register
1619      of the operation
1620    mem must be a memory operand
1621 
1622    Flags: - (does not modify flags) */
1623 
1624 SLJIT_API_FUNC_ATTRIBUTE sljit_s32 sljit_emit_fmem_update(struct sljit_compiler *compiler, sljit_s32 type,
1625 	sljit_s32 freg,
1626 	sljit_s32 mem, sljit_sw memw);
1627 
1628 /* Copies the base address of SLJIT_SP + offset to dst. The offset can
1629    represent the starting address of a value in the local data (stack).
1630    The offset is not limited by the local data limits, it can be any value.
1631    For example if an array of bytes are stored on the stack from
1632    offset 0x40, and R0 contains the offset of an array item plus 0x120,
1633    this item can be changed by two SLJIT instructions:
1634 
1635    sljit_get_local_base(compiler, SLJIT_R1, 0, 0x40 - 0x120);
1636    sljit_emit_op1(compiler, SLJIT_MOV_U8, SLJIT_MEM2(SLJIT_R1, SLJIT_R0), 0, SLJIT_IMM, 0x5);
1637 
1638    Flags: - (may destroy flags) */
1639 SLJIT_API_FUNC_ATTRIBUTE sljit_s32 sljit_get_local_base(struct sljit_compiler *compiler, sljit_s32 dst, sljit_sw dstw, sljit_sw offset);
1640 
1641 /* Store a value that can be changed runtime (see: sljit_get_const_addr / sljit_set_const)
1642    Flags: - (does not modify flags) */
1643 SLJIT_API_FUNC_ATTRIBUTE struct sljit_const* sljit_emit_const(struct sljit_compiler *compiler, sljit_s32 dst, sljit_sw dstw, sljit_sw init_value);
1644 
1645 /* Store the value of a label (see: sljit_set_put_label)
1646    Flags: - (does not modify flags) */
1647 SLJIT_API_FUNC_ATTRIBUTE struct sljit_put_label* sljit_emit_put_label(struct sljit_compiler *compiler, sljit_s32 dst, sljit_sw dstw);
1648 
1649 /* Set the value stored by put_label to this label. */
1650 SLJIT_API_FUNC_ATTRIBUTE void sljit_set_put_label(struct sljit_put_label *put_label, struct sljit_label *label);
1651 
1652 /* After the code generation the address for label, jump and const instructions
1653    are computed. Since these structures are freed by sljit_free_compiler, the
1654    addresses must be preserved by the user program elsewere. */
sljit_get_label_addr(struct sljit_label * label)1655 static SLJIT_INLINE sljit_uw sljit_get_label_addr(struct sljit_label *label) { return label->addr; }
sljit_get_jump_addr(struct sljit_jump * jump)1656 static SLJIT_INLINE sljit_uw sljit_get_jump_addr(struct sljit_jump *jump) { return jump->addr; }
sljit_get_const_addr(struct sljit_const * const_)1657 static SLJIT_INLINE sljit_uw sljit_get_const_addr(struct sljit_const *const_) { return const_->addr; }
1658 
1659 /* Only the address and executable offset are required to perform dynamic
1660    code modifications. See sljit_get_executable_offset function. */
1661 SLJIT_API_FUNC_ATTRIBUTE void sljit_set_jump_addr(sljit_uw addr, sljit_uw new_target, sljit_sw executable_offset);
1662 SLJIT_API_FUNC_ATTRIBUTE void sljit_set_const(sljit_uw addr, sljit_sw new_constant, sljit_sw executable_offset);
1663 
1664 /* --------------------------------------------------------------------- */
1665 /*  CPU specific functions                                               */
1666 /* --------------------------------------------------------------------- */
1667 
1668 /* The following function is a helper function for sljit_emit_op_custom.
1669    It returns with the real machine register index ( >=0 ) of any SLJIT_R,
1670    SLJIT_S and SLJIT_SP registers.
1671 
1672    Note: it returns with -1 for virtual registers (only on x86-32). */
1673 
1674 SLJIT_API_FUNC_ATTRIBUTE sljit_s32 sljit_get_register_index(sljit_s32 reg);
1675 
1676 /* The following function is a helper function for sljit_emit_op_custom.
1677    It returns with the real machine register ( >= 0 ) index of any SLJIT_FR,
1678    and SLJIT_FS register.
1679 
1680    Note: the index is always an even number on ARM-32, MIPS. */
1681 
1682 SLJIT_API_FUNC_ATTRIBUTE sljit_s32 sljit_get_float_register_index(sljit_s32 reg);
1683 
1684 /* Any instruction can be inserted into the instruction stream by
1685    sljit_emit_op_custom. It has a similar purpose as inline assembly.
1686    The size parameter must match to the instruction size of the target
1687    architecture:
1688 
1689          x86: 0 < size <= 15. The instruction argument can be byte aligned.
1690       Thumb2: if size == 2, the instruction argument must be 2 byte aligned.
1691               if size == 4, the instruction argument must be 4 byte aligned.
1692    Otherwise: size must be 4 and instruction argument must be 4 byte aligned. */
1693 
1694 SLJIT_API_FUNC_ATTRIBUTE sljit_s32 sljit_emit_op_custom(struct sljit_compiler *compiler,
1695 	void *instruction, sljit_u32 size);
1696 
1697 /* Flags were set by a 32 bit operation. */
1698 #define SLJIT_CURRENT_FLAGS_32			SLJIT_32
1699 
1700 /* Flags were set by an ADD or ADDC operations. */
1701 #define SLJIT_CURRENT_FLAGS_ADD			0x01
1702 /* Flags were set by a SUB, SUBC, or NEG operation. */
1703 #define SLJIT_CURRENT_FLAGS_SUB			0x02
1704 
1705 /* Flags were set by sljit_emit_op2u with SLJIT_SUB opcode.
1706    Must be combined with SLJIT_CURRENT_FLAGS_SUB. */
1707 #define SLJIT_CURRENT_FLAGS_COMPARE		0x04
1708 
1709 /* Define the currently available CPU status flags. It is usually used after
1710    an sljit_emit_label or sljit_emit_op_custom operations to define which CPU
1711    status flags are available.
1712 
1713    The current_flags must be a valid combination of SLJIT_SET_* and
1714    SLJIT_CURRENT_FLAGS_* constants. */
1715 
1716 SLJIT_API_FUNC_ATTRIBUTE void sljit_set_current_flags(struct sljit_compiler *compiler,
1717 	sljit_s32 current_flags);
1718 
1719 /* --------------------------------------------------------------------- */
1720 /*  Miscellaneous utility functions                                      */
1721 /* --------------------------------------------------------------------- */
1722 
1723 /* Get the human readable name of the platform. Can be useful on platforms
1724    like ARM, where ARM and Thumb2 functions can be mixed, and it is useful
1725    to know the type of the code generator. */
1726 SLJIT_API_FUNC_ATTRIBUTE const char* sljit_get_platform_name(void);
1727 
1728 /* Portable helper function to get an offset of a member. */
1729 #define SLJIT_OFFSETOF(base, member) ((sljit_sw)(&((base*)0x10)->member) - 0x10)
1730 
1731 #if (defined SLJIT_UTIL_STACK && SLJIT_UTIL_STACK)
1732 
1733 /* The sljit_stack structure and its manipulation functions provides
1734    an implementation for a top-down stack. The stack top is stored
1735    in the end field of the sljit_stack structure and the stack goes
1736    down to the min_start field, so the memory region reserved for
1737    this stack is between min_start (inclusive) and end (exclusive)
1738    fields. However the application can only use the region between
1739    start (inclusive) and end (exclusive) fields. The sljit_stack_resize
1740    function can be used to extend this region up to min_start.
1741 
1742    This feature uses the "address space reserve" feature of modern
1743    operating systems. Instead of allocating a large memory block
1744    applications can allocate a small memory region and extend it
1745    later without moving the content of the memory area. Therefore
1746    after a successful resize by sljit_stack_resize all pointers into
1747    this region are still valid.
1748 
1749    Note:
1750      this structure may not be supported by all operating systems.
1751      end and max_limit fields are aligned to PAGE_SIZE bytes (usually
1752          4 Kbyte or more).
1753      stack should grow in larger steps, e.g. 4Kbyte, 16Kbyte or more. */
1754 
1755 struct sljit_stack {
1756 	/* User data, anything can be stored here.
1757 	   Initialized to the same value as the end field. */
1758 	sljit_u8 *top;
1759 /* These members are read only. */
1760 	/* End address of the stack */
1761 	sljit_u8 *end;
1762 	/* Current start address of the stack. */
1763 	sljit_u8 *start;
1764 	/* Lowest start address of the stack. */
1765 	sljit_u8 *min_start;
1766 };
1767 
1768 /* Allocates a new stack. Returns NULL if unsuccessful.
1769    Note: see sljit_create_compiler for the explanation of allocator_data. */
1770 SLJIT_API_FUNC_ATTRIBUTE struct sljit_stack* SLJIT_FUNC sljit_allocate_stack(sljit_uw start_size, sljit_uw max_size, void *allocator_data);
1771 SLJIT_API_FUNC_ATTRIBUTE void SLJIT_FUNC sljit_free_stack(struct sljit_stack *stack, void *allocator_data);
1772 
1773 /* Can be used to increase (extend) or decrease (shrink) the stack
1774    memory area. Returns with new_start if successful and NULL otherwise.
1775    It always fails if new_start is less than min_start or greater or equal
1776    than end fields. The fields of the stack are not changed if the returned
1777    value is NULL (the current memory content is never lost). */
1778 SLJIT_API_FUNC_ATTRIBUTE sljit_u8 *SLJIT_FUNC sljit_stack_resize(struct sljit_stack *stack, sljit_u8 *new_start);
1779 
1780 #endif /* (defined SLJIT_UTIL_STACK && SLJIT_UTIL_STACK) */
1781 
1782 #if !(defined SLJIT_INDIRECT_CALL && SLJIT_INDIRECT_CALL)
1783 
1784 /* Get the entry address of a given function (signed, unsigned result). */
1785 #define SLJIT_FUNC_ADDR(func_name)	((sljit_sw)func_name)
1786 #define SLJIT_FUNC_UADDR(func_name)	((sljit_uw)func_name)
1787 
1788 #else /* !(defined SLJIT_INDIRECT_CALL && SLJIT_INDIRECT_CALL) */
1789 
1790 /* All JIT related code should be placed in the same context (library, binary, etc.). */
1791 
1792 /* Get the entry address of a given function (signed, unsigned result). */
1793 #define SLJIT_FUNC_ADDR(func_name)	(*(sljit_sw*)(void*)func_name)
1794 #define SLJIT_FUNC_UADDR(func_name)	(*(sljit_uw*)(void*)func_name)
1795 
1796 /* For powerpc64, the function pointers point to a context descriptor. */
1797 struct sljit_function_context {
1798 	sljit_uw addr;
1799 	sljit_uw r2;
1800 	sljit_uw r11;
1801 };
1802 
1803 /* Fill the context arguments using the addr and the function.
1804    If func_ptr is NULL, it will not be set to the address of context
1805    If addr is NULL, the function address also comes from the func pointer. */
1806 SLJIT_API_FUNC_ATTRIBUTE void sljit_set_function_context(void** func_ptr, struct sljit_function_context* context, sljit_uw addr, void* func);
1807 
1808 #endif /* !(defined SLJIT_INDIRECT_CALL && SLJIT_INDIRECT_CALL) */
1809 
1810 #if (defined SLJIT_EXECUTABLE_ALLOCATOR && SLJIT_EXECUTABLE_ALLOCATOR)
1811 /* Free unused executable memory. The allocator keeps some free memory
1812    around to reduce the number of OS executable memory allocations.
1813    This improves performance since these calls are costly. However
1814    it is sometimes desired to free all unused memory regions, e.g.
1815    before the application terminates. */
1816 SLJIT_API_FUNC_ATTRIBUTE void sljit_free_unused_memory_exec(void);
1817 #endif
1818 
1819 #ifdef __cplusplus
1820 } /* extern "C" */
1821 #endif
1822 
1823 #endif /* SLJIT_LIR_H_ */
1824