/[pcre]/code/trunk/sljit/sljitLir.h
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Contents of /code/trunk/sljit/sljitLir.h

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Revision 1460 - (show annotations) (download)
Wed Mar 5 14:44:22 2014 UTC (7 weeks, 1 day ago) by zherczeg
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JIT compiler update (with MIPS64 support).
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 - Limited number of registers (only 6+4 integer registers, max 3+2
60 scratch, max 3+2 saved and 6 floating point registers)
61 In practice:
62 - This approach is very effective for interpreters
63 - One of the saved registers typically points to a stack interface
64 - It can jump to any exception handler anytime (even if it belongs
65 to another function)
66 - Hot paths can be modified during runtime reflecting the changes
67 of the fastest execution path of the dynamic language
68 - SLJIT supports complex memory addressing modes
69 - mainly position and context independent code (except some cases)
70
71 For valgrind users:
72 - pass --smc-check=all argument to valgrind, since JIT is a "self-modifying code"
73 */
74
75 #if !(defined SLJIT_NO_DEFAULT_CONFIG && SLJIT_NO_DEFAULT_CONFIG)
76 #include "sljitConfig.h"
77 #endif
78
79 /* The following header file defines useful macros for fine tuning
80 sljit based code generators. They are listed in the beginning
81 of sljitConfigInternal.h */
82
83 #include "sljitConfigInternal.h"
84
85 /* --------------------------------------------------------------------- */
86 /* Error codes */
87 /* --------------------------------------------------------------------- */
88
89 /* Indicates no error. */
90 #define SLJIT_SUCCESS 0
91 /* After the call of sljit_generate_code(), the error code of the compiler
92 is set to this value to avoid future sljit calls (in debug mode at least).
93 The complier should be freed after sljit_generate_code(). */
94 #define SLJIT_ERR_COMPILED 1
95 /* Cannot allocate non executable memory. */
96 #define SLJIT_ERR_ALLOC_FAILED 2
97 /* Cannot allocate executable memory.
98 Only for sljit_generate_code() */
99 #define SLJIT_ERR_EX_ALLOC_FAILED 3
100 /* return value for SLJIT_CONFIG_UNSUPPORTED empty architecture. */
101 #define SLJIT_ERR_UNSUPPORTED 4
102
103 /* --------------------------------------------------------------------- */
104 /* Registers */
105 /* --------------------------------------------------------------------- */
106
107 #define SLJIT_UNUSED 0
108
109 /* Scratch (temporary) registers whose may not preserve their values
110 across function calls. */
111 #define SLJIT_SCRATCH_REG1 1
112 #define SLJIT_SCRATCH_REG2 2
113 #define SLJIT_SCRATCH_REG3 3
114 /* Note: extra registers cannot be used for memory addressing. */
115 /* Note: on x86-32, these registers are emulated (using stack
116 loads & stores). */
117 #define SLJIT_TEMPORARY_EREG1 4
118 #define SLJIT_TEMPORARY_EREG2 5
119
120 /* Saved registers whose preserve their values across function calls. */
121 #define SLJIT_SAVED_REG1 6
122 #define SLJIT_SAVED_REG2 7
123 #define SLJIT_SAVED_REG3 8
124 /* Note: extra registers cannot be used for memory addressing. */
125 /* Note: on x86-32, these registers are emulated (using stack
126 loads & stores). */
127 #define SLJIT_SAVED_EREG1 9
128 #define SLJIT_SAVED_EREG2 10
129
130 /* Read-only register (cannot be the destination of an operation).
131 Only SLJIT_MEM1(SLJIT_LOCALS_REG) addressing mode is allowed since
132 several ABIs has certain limitations about the stack layout. However
133 sljit_get_local_base() can be used to obtain the offset of a value
134 on the stack. */
135 #define SLJIT_LOCALS_REG 11
136
137 /* Number of registers. */
138 #define SLJIT_NO_TMP_REGISTERS 5
139 #define SLJIT_NO_GEN_REGISTERS 5
140 #define SLJIT_NO_REGISTERS 11
141
142 /* Return with machine word. */
143
144 #define SLJIT_RETURN_REG SLJIT_SCRATCH_REG1
145
146 /* x86 prefers specific registers for special purposes. In case of shift
147 by register it supports only SLJIT_SCRATCH_REG3 for shift argument
148 (which is the src2 argument of sljit_emit_op2). If another register is
149 used, sljit must exchange data between registers which cause a minor
150 slowdown. Other architectures has no such limitation. */
151
152 #define SLJIT_PREF_SHIFT_REG SLJIT_SCRATCH_REG3
153
154 /* --------------------------------------------------------------------- */
155 /* Floating point registers */
156 /* --------------------------------------------------------------------- */
157
158 /* Note: SLJIT_UNUSED as destination is not valid for floating point
159 operations, since they cannot be used for setting flags. */
160
161 /* Floating point operations are performed on double or
162 single precision values. */
163
164 #define SLJIT_FLOAT_REG1 1
165 #define SLJIT_FLOAT_REG2 2
166 #define SLJIT_FLOAT_REG3 3
167 #define SLJIT_FLOAT_REG4 4
168 #define SLJIT_FLOAT_REG5 5
169 #define SLJIT_FLOAT_REG6 6
170
171 #define SLJIT_NO_FLOAT_REGISTERS 6
172
173 /* --------------------------------------------------------------------- */
174 /* Main structures and functions */
175 /* --------------------------------------------------------------------- */
176
177 struct sljit_memory_fragment {
178 struct sljit_memory_fragment *next;
179 sljit_uw used_size;
180 /* Must be aligned to sljit_sw. */
181 sljit_ub memory[1];
182 };
183
184 struct sljit_label {
185 struct sljit_label *next;
186 sljit_uw addr;
187 /* The maximum size difference. */
188 sljit_uw size;
189 };
190
191 struct sljit_jump {
192 struct sljit_jump *next;
193 sljit_uw addr;
194 sljit_sw flags;
195 union {
196 sljit_uw target;
197 struct sljit_label* label;
198 } u;
199 };
200
201 struct sljit_const {
202 struct sljit_const *next;
203 sljit_uw addr;
204 };
205
206 struct sljit_compiler {
207 sljit_si error;
208
209 struct sljit_label *labels;
210 struct sljit_jump *jumps;
211 struct sljit_const *consts;
212 struct sljit_label *last_label;
213 struct sljit_jump *last_jump;
214 struct sljit_const *last_const;
215
216 struct sljit_memory_fragment *buf;
217 struct sljit_memory_fragment *abuf;
218
219 /* Used local registers. */
220 sljit_si scratches;
221 /* Used saved registers. */
222 sljit_si saveds;
223 /* Local stack size. */
224 sljit_si local_size;
225 /* Code size. */
226 sljit_uw size;
227 /* For statistical purposes. */
228 sljit_uw executable_size;
229
230 #if (defined SLJIT_CONFIG_X86_32 && SLJIT_CONFIG_X86_32)
231 sljit_si args;
232 sljit_si locals_offset;
233 sljit_si scratches_start;
234 sljit_si saveds_start;
235 #endif
236
237 #if (defined SLJIT_CONFIG_X86_64 && SLJIT_CONFIG_X86_64)
238 sljit_si mode32;
239 #endif
240
241 #if (defined SLJIT_CONFIG_X86_32 && SLJIT_CONFIG_X86_32) || (defined SLJIT_CONFIG_X86_64 && SLJIT_CONFIG_X86_64)
242 sljit_si flags_saved;
243 #endif
244
245 #if (defined SLJIT_CONFIG_ARM_V5 && SLJIT_CONFIG_ARM_V5)
246 /* Constant pool handling. */
247 sljit_uw *cpool;
248 sljit_ub *cpool_unique;
249 sljit_uw cpool_diff;
250 sljit_uw cpool_fill;
251 /* Other members. */
252 /* Contains pointer, "ldr pc, [...]" pairs. */
253 sljit_uw patches;
254 #endif
255
256 #if (defined SLJIT_CONFIG_ARM_V5 && SLJIT_CONFIG_ARM_V5) || (defined SLJIT_CONFIG_ARM_V7 && SLJIT_CONFIG_ARM_V7)
257 /* Temporary fields. */
258 sljit_uw shift_imm;
259 sljit_si cache_arg;
260 sljit_sw cache_argw;
261 #endif
262
263 #if (defined SLJIT_CONFIG_ARM_THUMB2 && SLJIT_CONFIG_ARM_THUMB2)
264 sljit_si cache_arg;
265 sljit_sw cache_argw;
266 #endif
267
268 #if (defined SLJIT_CONFIG_ARM_64 && SLJIT_CONFIG_ARM_64)
269 sljit_si locals_offset;
270 sljit_si cache_arg;
271 sljit_sw cache_argw;
272 #endif
273
274 #if (defined SLJIT_CONFIG_PPC_32 && SLJIT_CONFIG_PPC_32) || (defined SLJIT_CONFIG_PPC_64 && SLJIT_CONFIG_PPC_64)
275 sljit_sw imm;
276 sljit_si cache_arg;
277 sljit_sw cache_argw;
278 #endif
279
280 #if (defined SLJIT_CONFIG_MIPS_32 && SLJIT_CONFIG_MIPS_32) || (defined SLJIT_CONFIG_MIPS_64 && SLJIT_CONFIG_MIPS_64)
281 sljit_si delay_slot;
282 sljit_si cache_arg;
283 sljit_sw cache_argw;
284 #endif
285
286 #if (defined SLJIT_CONFIG_SPARC_32 && SLJIT_CONFIG_SPARC_32)
287 sljit_si delay_slot;
288 sljit_si cache_arg;
289 sljit_sw cache_argw;
290 #endif
291
292 #if (defined SLJIT_CONFIG_TILEGX && SLJIT_CONFIG_TILEGX)
293 sljit_si cache_arg;
294 sljit_sw cache_argw;
295 #endif
296
297 #if (defined SLJIT_VERBOSE && SLJIT_VERBOSE)
298 FILE* verbose;
299 #endif
300
301 #if (defined SLJIT_DEBUG && SLJIT_DEBUG)
302 /* Local size passed to the functions. */
303 sljit_si logical_local_size;
304 #endif
305
306 #if (defined SLJIT_VERBOSE && SLJIT_VERBOSE) || (defined SLJIT_DEBUG && SLJIT_DEBUG)
307 sljit_si skip_checks;
308 #endif
309 };
310
311 /* --------------------------------------------------------------------- */
312 /* Main functions */
313 /* --------------------------------------------------------------------- */
314
315 /* Creates an sljit compiler.
316 Returns NULL if failed. */
317 SLJIT_API_FUNC_ATTRIBUTE struct sljit_compiler* sljit_create_compiler(void);
318
319 /* Free everything except the compiled machine code. */
320 SLJIT_API_FUNC_ATTRIBUTE void sljit_free_compiler(struct sljit_compiler *compiler);
321
322 /* Returns the current error code. If an error is occurred, future sljit
323 calls which uses the same compiler argument returns early with the same
324 error code. Thus there is no need for checking the error after every
325 call, it is enough to do it before the code is compiled. Removing
326 these checks increases the performance of the compiling process. */
327 static SLJIT_INLINE sljit_si sljit_get_compiler_error(struct sljit_compiler *compiler) { return compiler->error; }
328
329 /*
330 Allocate a small amount of memory. The size must be <= 64 bytes on 32 bit,
331 and <= 128 bytes on 64 bit architectures. The memory area is owned by the
332 compiler, and freed by sljit_free_compiler. The returned pointer is
333 sizeof(sljit_sw) aligned. Excellent for allocating small blocks during
334 the compiling, and no need to worry about freeing them. The size is
335 enough to contain at most 16 pointers. If the size is outside of the range,
336 the function will return with NULL. However, this return value does not
337 indicate that there is no more memory (does not set the current error code
338 of the compiler to out-of-memory status).
339 */
340 SLJIT_API_FUNC_ATTRIBUTE void* sljit_alloc_memory(struct sljit_compiler *compiler, sljit_si size);
341
342 #if (defined SLJIT_VERBOSE && SLJIT_VERBOSE)
343 /* Passing NULL disables verbose. */
344 SLJIT_API_FUNC_ATTRIBUTE void sljit_compiler_verbose(struct sljit_compiler *compiler, FILE* verbose);
345 #endif
346
347 SLJIT_API_FUNC_ATTRIBUTE void* sljit_generate_code(struct sljit_compiler *compiler);
348 SLJIT_API_FUNC_ATTRIBUTE void sljit_free_code(void* code);
349
350 /*
351 After the machine code generation is finished we can retrieve the allocated
352 executable memory size, although this area may not be fully filled with
353 instructions depending on some optimizations. This function is useful only
354 for statistical purposes.
355
356 Before a successful code generation, this function returns with 0.
357 */
358 static SLJIT_INLINE sljit_uw sljit_get_generated_code_size(struct sljit_compiler *compiler) { return compiler->executable_size; }
359
360 /* Instruction generation. Returns with any error code. If there is no
361 error, they return with SLJIT_SUCCESS. */
362
363 /*
364 The executable code is basically a function call from the viewpoint of
365 the C language. The function calls must obey to the ABI (Application
366 Binary Interface) of the platform, which specify the purpose of machine
367 registers and stack handling among other things. The sljit_emit_enter
368 function emits the necessary instructions for setting up a new context
369 for the executable code and moves function arguments to the saved
370 registers. The number of arguments are specified in the "args"
371 parameter and the first argument goes to SLJIT_SAVED_REG1, the second
372 goes to SLJIT_SAVED_REG2 and so on. The number of scratch and
373 saved registers are passed in "scratches" and "saveds" arguments
374 respectively. Since the saved registers contains the arguments,
375 "args" must be less or equal than "saveds". The sljit_emit_enter
376 is also capable of allocating a stack space for local variables. The
377 "local_size" argument contains the size in bytes of this local area
378 and its staring address is stored in SLJIT_LOCALS_REG. However
379 the SLJIT_LOCALS_REG is not necessary the machine stack pointer.
380 The memory bytes between SLJIT_LOCALS_REG (inclusive) and
381 SLJIT_LOCALS_REG + local_size (exclusive) can be modified freely
382 until the function returns. The stack space is uninitialized.
383
384 Note: every call of sljit_emit_enter and sljit_set_context
385 overwrites the previous context. */
386
387 #define SLJIT_MAX_LOCAL_SIZE 65536
388
389 SLJIT_API_FUNC_ATTRIBUTE sljit_si sljit_emit_enter(struct sljit_compiler *compiler,
390 sljit_si args, sljit_si scratches, sljit_si saveds, sljit_si local_size);
391
392 /* The machine code has a context (which contains the local stack space size,
393 number of used registers, etc.) which initialized by sljit_emit_enter. Several
394 functions (like sljit_emit_return) requres this context to be able to generate
395 the appropriate code. However, some code fragments (like inline cache) may have
396 no normal entry point so their context is unknown for the compiler. Using the
397 function below we can specify their context.
398
399 Note: every call of sljit_emit_enter and sljit_set_context overwrites
400 the previous context. */
401
402 SLJIT_API_FUNC_ATTRIBUTE void sljit_set_context(struct sljit_compiler *compiler,
403 sljit_si args, sljit_si scratches, sljit_si saveds, sljit_si local_size);
404
405 /* Return from machine code. The op argument can be SLJIT_UNUSED which means the
406 function does not return with anything or any opcode between SLJIT_MOV and
407 SLJIT_MOV_P (see sljit_emit_op1). As for src and srcw they must be 0 if op
408 is SLJIT_UNUSED, otherwise see below the description about source and
409 destination arguments. */
410
411 SLJIT_API_FUNC_ATTRIBUTE sljit_si sljit_emit_return(struct sljit_compiler *compiler, sljit_si op,
412 sljit_si src, sljit_sw srcw);
413
414 /* Fast calling mechanism for utility functions (see SLJIT_FAST_CALL). All registers and
415 even the stack frame is passed to the callee. The return address is preserved in
416 dst/dstw by sljit_emit_fast_enter (the type of the value stored by this function
417 is sljit_p), and sljit_emit_fast_return can use this as a return value later. */
418
419 /* Note: only for sljit specific, non ABI compilant calls. Fast, since only a few machine
420 instructions are needed. Excellent for small uility functions, where saving registers
421 and setting up a new stack frame would cost too much performance. However, it is still
422 possible to return to the address of the caller (or anywhere else). */
423
424 /* Note: flags are not changed (unlike sljit_emit_enter / sljit_emit_return). */
425
426 /* Note: although sljit_emit_fast_return could be replaced by an ijump, it is not suggested,
427 since many architectures do clever branch prediction on call / return instruction pairs. */
428
429 SLJIT_API_FUNC_ATTRIBUTE sljit_si sljit_emit_fast_enter(struct sljit_compiler *compiler, sljit_si dst, sljit_sw dstw);
430 SLJIT_API_FUNC_ATTRIBUTE sljit_si sljit_emit_fast_return(struct sljit_compiler *compiler, sljit_si src, sljit_sw srcw);
431
432 /*
433 Source and destination values for arithmetical instructions
434 imm - a simple immediate value (cannot be used as a destination)
435 reg - any of the registers (immediate argument must be 0)
436 [imm] - absolute immediate memory address
437 [reg+imm] - indirect memory address
438 [reg+(reg<<imm)] - indirect indexed memory address (shift must be between 0 and 3)
439 useful for (byte, half, int, sljit_sw) array access
440 (fully supported by both x86 and ARM architectures, and cheap operation on others)
441 */
442
443 /*
444 IMPORATNT NOTE: memory access MUST be naturally aligned except
445 SLJIT_UNALIGNED macro is defined and its value is 1.
446
447 length | alignment
448 ---------+-----------
449 byte | 1 byte (any physical_address is accepted)
450 half | 2 byte (physical_address & 0x1 == 0)
451 int | 4 byte (physical_address & 0x3 == 0)
452 word | 4 byte if SLJIT_32BIT_ARCHITECTURE is defined and its value is 1
453 | 8 byte if SLJIT_64BIT_ARCHITECTURE is defined and its value is 1
454 pointer | size of sljit_p type (4 byte on 32 bit machines, 4 or 8 byte
455 | on 64 bit machines)
456
457 Note: Different architectures have different addressing limitations.
458 A single instruction is enough for the following addressing
459 modes. Other adrressing modes are emulated by instruction
460 sequences. This information could help to improve those code
461 generators which focuses only a few architectures.
462
463 x86: [reg+imm], -2^32+1 <= imm <= 2^32-1 (full address space on x86-32)
464 [reg+(reg<<imm)] is supported
465 [imm], -2^32+1 <= imm <= 2^32-1 is supported
466 Write-back is not supported
467 arm: [reg+imm], -4095 <= imm <= 4095 or -255 <= imm <= 255 for signed
468 bytes, any halfs or floating point values)
469 [reg+(reg<<imm)] is supported
470 Write-back is supported
471 arm-t2: [reg+imm], -255 <= imm <= 4095
472 [reg+(reg<<imm)] is supported
473 Write back is supported only for [reg+imm], where -255 <= imm <= 255
474 ppc: [reg+imm], -65536 <= imm <= 65535. 64 bit loads/stores and 32 bit
475 signed load on 64 bit requires immediates divisible by 4.
476 [reg+imm] is not supported for signed 8 bit values.
477 [reg+reg] is supported
478 Write-back is supported except for one instruction: 32 bit signed
479 load with [reg+imm] addressing mode on 64 bit.
480 mips: [reg+imm], -65536 <= imm <= 65535
481 sparc: [reg+imm], -4096 <= imm <= 4095
482 [reg+reg] is supported
483 */
484
485 /* Register output: simply the name of the register.
486 For destination, you can use SLJIT_UNUSED as well. */
487 #define SLJIT_MEM 0x80
488 #define SLJIT_MEM0() (SLJIT_MEM)
489 #define SLJIT_MEM1(r1) (SLJIT_MEM | (r1))
490 #define SLJIT_MEM2(r1, r2) (SLJIT_MEM | (r1) | ((r2) << 8))
491 #define SLJIT_IMM 0x40
492
493 /* Set 32 bit operation mode (I) on 64 bit CPUs. The flag is totally ignored on
494 32 bit CPUs. If this flag is set for an arithmetic operation, it uses only the
495 lower 32 bit of the input register(s), and set the CPU status flags according
496 to the 32 bit result. The higher 32 bits are undefined for both the input and
497 output. However, the CPU might not ignore those higher 32 bits, like MIPS, which
498 expects it to be the sign extension of the lower 32 bit. All 32 bit operations
499 are undefined, if this condition is not fulfilled. Therefore, when SLJIT_INT_OP
500 is specified, all register arguments must be the result of other operations with
501 the same SLJIT_INT_OP flag. In other words, although a register can hold either
502 a 64 or 32 bit value, these values cannot be mixed. The only exceptions are
503 SLJIT_IMOV and SLJIT_IMOVU (SLJIT_MOV_SI/SLJIT_MOVU_SI with SLJIT_INT_OP flag)
504 which can convert any source argument to SLJIT_INT_OP compatible result. This
505 conversion might be unnecessary on some CPUs like x86-64, since the upper 32
506 bit is always ignored. In this case SLJIT is clever enough to not generate any
507 instructions if the source and destination operands are the same registers.
508 Affects sljit_emit_op0, sljit_emit_op1 and sljit_emit_op2. */
509 #define SLJIT_INT_OP 0x100
510
511 /* Single precision mode (SP). This flag is similar to SLJIT_INT_OP, just
512 it applies to floating point registers (it is even the same bit). When
513 this flag is passed, the CPU performs single precision floating point
514 operations. Similar to SLJIT_INT_OP, all register arguments must be the
515 result of other floating point operations with this flag. Affects
516 sljit_emit_fop1, sljit_emit_fop2 and sljit_emit_fcmp. */
517 #define SLJIT_SINGLE_OP 0x100
518
519 /* Common CPU status flags for all architectures (x86, ARM, PPC)
520 - carry flag
521 - overflow flag
522 - zero flag
523 - negative/positive flag (depends on arc)
524 On mips, these flags are emulated by software. */
525
526 /* By default, the instructions may, or may not set the CPU status flags.
527 Forcing to set or keep status flags can be done with the following flags: */
528
529 /* Note: sljit tries to emit the minimum number of instructions. Using these
530 flags can increase them, so use them wisely to avoid unnecessary code generation. */
531
532 /* Set Equal (Zero) status flag (E). */
533 #define SLJIT_SET_E 0x0200
534 /* Set unsigned status flag (U). */
535 #define SLJIT_SET_U 0x0400
536 /* Set signed status flag (S). */
537 #define SLJIT_SET_S 0x0800
538 /* Set signed overflow flag (O). */
539 #define SLJIT_SET_O 0x1000
540 /* Set carry flag (C).
541 Note: Kinda unsigned overflow, but behaves differently on various cpus. */
542 #define SLJIT_SET_C 0x2000
543 /* Do not modify the flags (K).
544 Note: This flag cannot be combined with any other SLJIT_SET_* flag. */
545 #define SLJIT_KEEP_FLAGS 0x4000
546
547 /* Notes:
548 - you cannot postpone conditional jump instructions except if noted that
549 the instruction does not set flags (See: SLJIT_KEEP_FLAGS).
550 - flag combinations: '|' means 'logical or'. */
551
552 /* Flags: - (never set any flags)
553 Note: breakpoint instruction is not supported by all architectures (namely ppc)
554 It falls back to SLJIT_NOP in those cases. */
555 #define SLJIT_BREAKPOINT 0
556 /* Flags: - (never set any flags)
557 Note: may or may not cause an extra cycle wait
558 it can even decrease the runtime in a few cases. */
559 #define SLJIT_NOP 1
560 /* Flags: - (may destroy flags)
561 Unsigned multiplication of SLJIT_SCRATCH_REG1 and SLJIT_SCRATCH_REG2.
562 Result goes to SLJIT_SCRATCH_REG2:SLJIT_SCRATCH_REG1 (high:low) word */
563 #define SLJIT_UMUL 2
564 /* Flags: - (may destroy flags)
565 Signed multiplication of SLJIT_SCRATCH_REG1 and SLJIT_SCRATCH_REG2.
566 Result goes to SLJIT_SCRATCH_REG2:SLJIT_SCRATCH_REG1 (high:low) word */
567 #define SLJIT_SMUL 3
568 /* Flags: I - (may destroy flags)
569 Unsigned divide of the value in SLJIT_SCRATCH_REG1 by the value in SLJIT_SCRATCH_REG2.
570 The result is placed in SLJIT_SCRATCH_REG1 and the remainder goes to SLJIT_SCRATCH_REG2.
571 Note: if SLJIT_SCRATCH_REG2 contains 0, the behaviour is undefined. */
572 #define SLJIT_UDIV 4
573 #define SLJIT_IUDIV (SLJIT_UDIV | SLJIT_INT_OP)
574 /* Flags: I - (may destroy flags)
575 Signed divide of the value in SLJIT_SCRATCH_REG1 by the value in SLJIT_SCRATCH_REG2.
576 The result is placed in SLJIT_SCRATCH_REG1 and the remainder goes to SLJIT_SCRATCH_REG2.
577 Note: if SLJIT_SCRATCH_REG2 contains 0, the behaviour is undefined. */
578 #define SLJIT_SDIV 5
579 #define SLJIT_ISDIV (SLJIT_SDIV | SLJIT_INT_OP)
580
581 SLJIT_API_FUNC_ATTRIBUTE sljit_si sljit_emit_op0(struct sljit_compiler *compiler, sljit_si op);
582
583 /* Notes for MOV instructions:
584 U = Mov with update (pre form). If source or destination defined as SLJIT_MEM1(r1)
585 or SLJIT_MEM2(r1, r2), r1 is increased by the sum of r2 and the constant argument
586 UB = unsigned byte (8 bit)
587 SB = signed byte (8 bit)
588 UH = unsigned half (16 bit)
589 SH = signed half (16 bit)
590 UI = unsigned int (32 bit)
591 SI = signed int (32 bit)
592 P = pointer (sljit_p) size */
593
594 /* Flags: - (never set any flags) */
595 #define SLJIT_MOV 6
596 /* Flags: I - (never set any flags) */
597 #define SLJIT_MOV_UB 7
598 #define SLJIT_IMOV_UB (SLJIT_MOV_UB | SLJIT_INT_OP)
599 /* Flags: I - (never set any flags) */
600 #define SLJIT_MOV_SB 8
601 #define SLJIT_IMOV_SB (SLJIT_MOV_SB | SLJIT_INT_OP)
602 /* Flags: I - (never set any flags) */
603 #define SLJIT_MOV_UH 9
604 #define SLJIT_IMOV_UH (SLJIT_MOV_UH | SLJIT_INT_OP)
605 /* Flags: I - (never set any flags) */
606 #define SLJIT_MOV_SH 10
607 #define SLJIT_IMOV_SH (SLJIT_MOV_SH | SLJIT_INT_OP)
608 /* Flags: I - (never set any flags)
609 Note: see SLJIT_INT_OP for further details. */
610 #define SLJIT_MOV_UI 11
611 /* No SLJIT_INT_OP form, since it is the same as SLJIT_IMOV. */
612 /* Flags: I - (never set any flags)
613 Note: see SLJIT_INT_OP for further details. */
614 #define SLJIT_MOV_SI 12
615 #define SLJIT_IMOV (SLJIT_MOV_SI | SLJIT_INT_OP)
616 /* Flags: - (never set any flags) */
617 #define SLJIT_MOV_P 13
618 /* Flags: - (never set any flags) */
619 #define SLJIT_MOVU 14
620 /* Flags: I - (never set any flags) */
621 #define SLJIT_MOVU_UB 15
622 #define SLJIT_IMOVU_UB (SLJIT_MOVU_UB | SLJIT_INT_OP)
623 /* Flags: I - (never set any flags) */
624 #define SLJIT_MOVU_SB 16
625 #define SLJIT_IMOVU_SB (SLJIT_MOVU_SB | SLJIT_INT_OP)
626 /* Flags: I - (never set any flags) */
627 #define SLJIT_MOVU_UH 17
628 #define SLJIT_IMOVU_UH (SLJIT_MOVU_UH | SLJIT_INT_OP)
629 /* Flags: I - (never set any flags) */
630 #define SLJIT_MOVU_SH 18
631 #define SLJIT_IMOVU_SH (SLJIT_MOVU_SH | SLJIT_INT_OP)
632 /* Flags: I - (never set any flags)
633 Note: see SLJIT_INT_OP for further details. */
634 #define SLJIT_MOVU_UI 19
635 /* No SLJIT_INT_OP form, since it is the same as SLJIT_IMOVU. */
636 /* Flags: I - (never set any flags)
637 Note: see SLJIT_INT_OP for further details. */
638 #define SLJIT_MOVU_SI 20
639 #define SLJIT_IMOVU (SLJIT_MOVU_SI | SLJIT_INT_OP)
640 /* Flags: - (never set any flags) */
641 #define SLJIT_MOVU_P 21
642 /* Flags: I | E | K */
643 #define SLJIT_NOT 22
644 #define SLJIT_INOT (SLJIT_NOT | SLJIT_INT_OP)
645 /* Flags: I | E | O | K */
646 #define SLJIT_NEG 23
647 #define SLJIT_INEG (SLJIT_NEG | SLJIT_INT_OP)
648 /* Count leading zeroes
649 Flags: I | E | K
650 Important note! Sparc 32 does not support K flag, since
651 the required popc instruction is introduced only in sparc 64. */
652 #define SLJIT_CLZ 24
653 #define SLJIT_ICLZ (SLJIT_CLZ | SLJIT_INT_OP)
654
655 SLJIT_API_FUNC_ATTRIBUTE sljit_si sljit_emit_op1(struct sljit_compiler *compiler, sljit_si op,
656 sljit_si dst, sljit_sw dstw,
657 sljit_si src, sljit_sw srcw);
658
659 /* Flags: I | E | O | C | K */
660 #define SLJIT_ADD 25
661 #define SLJIT_IADD (SLJIT_ADD | SLJIT_INT_OP)
662 /* Flags: I | C | K */
663 #define SLJIT_ADDC 26
664 #define SLJIT_IADDC (SLJIT_ADDC | SLJIT_INT_OP)
665 /* Flags: I | E | U | S | O | C | K */
666 #define SLJIT_SUB 27
667 #define SLJIT_ISUB (SLJIT_SUB | SLJIT_INT_OP)
668 /* Flags: I | C | K */
669 #define SLJIT_SUBC 28
670 #define SLJIT_ISUBC (SLJIT_SUBC | SLJIT_INT_OP)
671 /* Note: integer mul
672 Flags: I | O (see SLJIT_C_MUL_*) | K */
673 #define SLJIT_MUL 29
674 #define SLJIT_IMUL (SLJIT_MUL | SLJIT_INT_OP)
675 /* Flags: I | E | K */
676 #define SLJIT_AND 30
677 #define SLJIT_IAND (SLJIT_AND | SLJIT_INT_OP)
678 /* Flags: I | E | K */
679 #define SLJIT_OR 31
680 #define SLJIT_IOR (SLJIT_OR | SLJIT_INT_OP)
681 /* Flags: I | E | K */
682 #define SLJIT_XOR 32
683 #define SLJIT_IXOR (SLJIT_XOR | SLJIT_INT_OP)
684 /* Flags: I | E | K
685 Let bit_length be the length of the shift operation: 32 or 64.
686 If src2 is immediate, src2w is masked by (bit_length - 1).
687 Otherwise, if the content of src2 is outside the range from 0
688 to bit_length - 1, the operation is undefined. */
689 #define SLJIT_SHL 33
690 #define SLJIT_ISHL (SLJIT_SHL | SLJIT_INT_OP)
691 /* Flags: I | E | K
692 Let bit_length be the length of the shift operation: 32 or 64.
693 If src2 is immediate, src2w is masked by (bit_length - 1).
694 Otherwise, if the content of src2 is outside the range from 0
695 to bit_length - 1, the operation is undefined. */
696 #define SLJIT_LSHR 34
697 #define SLJIT_ILSHR (SLJIT_LSHR | SLJIT_INT_OP)
698 /* Flags: I | E | K
699 Let bit_length be the length of the shift operation: 32 or 64.
700 If src2 is immediate, src2w is masked by (bit_length - 1).
701 Otherwise, if the content of src2 is outside the range from 0
702 to bit_length - 1, the operation is undefined. */
703 #define SLJIT_ASHR 35
704 #define SLJIT_IASHR (SLJIT_ASHR | SLJIT_INT_OP)
705
706 SLJIT_API_FUNC_ATTRIBUTE sljit_si sljit_emit_op2(struct sljit_compiler *compiler, sljit_si op,
707 sljit_si dst, sljit_sw dstw,
708 sljit_si src1, sljit_sw src1w,
709 sljit_si src2, sljit_sw src2w);
710
711 /* The following function is a helper function for sljit_emit_op_custom.
712 It returns with the real machine register index of any SLJIT_SCRATCH
713 SLJIT_SAVED or SLJIT_LOCALS register.
714 Note: it returns with -1 for virtual registers (all EREGs on x86-32). */
715
716 SLJIT_API_FUNC_ATTRIBUTE sljit_si sljit_get_register_index(sljit_si reg);
717
718 /* The following function is a helper function for sljit_emit_op_custom.
719 It returns with the real machine register index of any SLJIT_FLOAT register.
720 Note: the index is divided by 2 on ARM 32 bit architectures. */
721
722 SLJIT_API_FUNC_ATTRIBUTE sljit_si sljit_get_float_register_index(sljit_si reg);
723
724 /* Any instruction can be inserted into the instruction stream by
725 sljit_emit_op_custom. It has a similar purpose as inline assembly.
726 The size parameter must match to the instruction size of the target
727 architecture:
728
729 x86: 0 < size <= 15. The instruction argument can be byte aligned.
730 Thumb2: if size == 2, the instruction argument must be 2 byte aligned.
731 if size == 4, the instruction argument must be 4 byte aligned.
732 Otherwise: size must be 4 and instruction argument must be 4 byte aligned. */
733
734 SLJIT_API_FUNC_ATTRIBUTE sljit_si sljit_emit_op_custom(struct sljit_compiler *compiler,
735 void *instruction, sljit_si size);
736
737 /* Returns with non-zero if fpu is available. */
738
739 SLJIT_API_FUNC_ATTRIBUTE sljit_si sljit_is_fpu_available(void);
740
741 /* Note: dst is the left and src is the right operand for SLJIT_FCMP.
742 Note: NaN check is always performed. If SLJIT_C_FLOAT_UNORDERED is set,
743 the comparison result is unpredictable.
744 Flags: SP | E | S (see SLJIT_C_FLOAT_*) */
745 #define SLJIT_CMPD 36
746 #define SLJIT_CMPS (SLJIT_CMPD | SLJIT_SINGLE_OP)
747 /* Flags: SP - (never set any flags) */
748 #define SLJIT_MOVD 37
749 #define SLJIT_MOVS (SLJIT_MOVD | SLJIT_SINGLE_OP)
750 /* Flags: SP - (never set any flags) */
751 #define SLJIT_NEGD 38
752 #define SLJIT_NEGS (SLJIT_NEGD | SLJIT_SINGLE_OP)
753 /* Flags: SP - (never set any flags) */
754 #define SLJIT_ABSD 39
755 #define SLJIT_ABSS (SLJIT_ABSD | SLJIT_SINGLE_OP)
756
757 SLJIT_API_FUNC_ATTRIBUTE sljit_si sljit_emit_fop1(struct sljit_compiler *compiler, sljit_si op,
758 sljit_si dst, sljit_sw dstw,
759 sljit_si src, sljit_sw srcw);
760
761 /* Flags: SP - (never set any flags) */
762 #define SLJIT_ADDD 40
763 #define SLJIT_ADDS (SLJIT_ADDD | SLJIT_SINGLE_OP)
764 /* Flags: SP - (never set any flags) */
765 #define SLJIT_SUBD 41
766 #define SLJIT_SUBS (SLJIT_SUBD | SLJIT_SINGLE_OP)
767 /* Flags: SP - (never set any flags) */
768 #define SLJIT_MULD 42
769 #define SLJIT_MULS (SLJIT_MULD | SLJIT_SINGLE_OP)
770 /* Flags: SP - (never set any flags) */
771 #define SLJIT_DIVD 43
772 #define SLJIT_DIVS (SLJIT_DIVD | SLJIT_SINGLE_OP)
773
774 SLJIT_API_FUNC_ATTRIBUTE sljit_si sljit_emit_fop2(struct sljit_compiler *compiler, sljit_si op,
775 sljit_si dst, sljit_sw dstw,
776 sljit_si src1, sljit_sw src1w,
777 sljit_si src2, sljit_sw src2w);
778
779 /* Label and jump instructions. */
780
781 SLJIT_API_FUNC_ATTRIBUTE struct sljit_label* sljit_emit_label(struct sljit_compiler *compiler);
782
783 /* Invert conditional instruction: xor (^) with 0x1 */
784 #define SLJIT_C_EQUAL 0
785 #define SLJIT_C_ZERO 0
786 #define SLJIT_C_NOT_EQUAL 1
787 #define SLJIT_C_NOT_ZERO 1
788
789 #define SLJIT_C_LESS 2
790 #define SLJIT_C_GREATER_EQUAL 3
791 #define SLJIT_C_GREATER 4
792 #define SLJIT_C_LESS_EQUAL 5
793 #define SLJIT_C_SIG_LESS 6
794 #define SLJIT_C_SIG_GREATER_EQUAL 7
795 #define SLJIT_C_SIG_GREATER 8
796 #define SLJIT_C_SIG_LESS_EQUAL 9
797
798 #define SLJIT_C_OVERFLOW 10
799 #define SLJIT_C_NOT_OVERFLOW 11
800
801 #define SLJIT_C_MUL_OVERFLOW 12
802 #define SLJIT_C_MUL_NOT_OVERFLOW 13
803
804 #define SLJIT_C_FLOAT_EQUAL 14
805 #define SLJIT_C_FLOAT_NOT_EQUAL 15
806 #define SLJIT_C_FLOAT_LESS 16
807 #define SLJIT_C_FLOAT_GREATER_EQUAL 17
808 #define SLJIT_C_FLOAT_GREATER 18
809 #define SLJIT_C_FLOAT_LESS_EQUAL 19
810 #define SLJIT_C_FLOAT_UNORDERED 20
811 #define SLJIT_C_FLOAT_ORDERED 21
812
813 #define SLJIT_JUMP 22
814 #define SLJIT_FAST_CALL 23
815 #define SLJIT_CALL0 24
816 #define SLJIT_CALL1 25
817 #define SLJIT_CALL2 26
818 #define SLJIT_CALL3 27
819
820 /* Fast calling method. See sljit_emit_fast_enter / sljit_emit_fast_return. */
821
822 /* The target can be changed during runtime (see: sljit_set_jump_addr). */
823 #define SLJIT_REWRITABLE_JUMP 0x1000
824
825 /* Emit a jump instruction. The destination is not set, only the type of the jump.
826 type must be between SLJIT_C_EQUAL and SLJIT_CALL3
827 type can be combined (or'ed) with SLJIT_REWRITABLE_JUMP
828 Flags: - (never set any flags) for both conditional and unconditional jumps.
829 Flags: destroy all flags for calls. */
830 SLJIT_API_FUNC_ATTRIBUTE struct sljit_jump* sljit_emit_jump(struct sljit_compiler *compiler, sljit_si type);
831
832 /* Basic arithmetic comparison. In most architectures it is implemented as
833 an SLJIT_SUB operation (with SLJIT_UNUSED destination and setting
834 appropriate flags) followed by a sljit_emit_jump. However some
835 architectures (i.e: MIPS) may employ special optimizations here. It is
836 suggested to use this comparison form when appropriate.
837 type must be between SLJIT_C_EQUAL and SLJIT_C_SIG_LESS_EQUAL
838 type can be combined (or'ed) with SLJIT_REWRITABLE_JUMP or SLJIT_INT_OP
839 Flags: destroy flags. */
840 SLJIT_API_FUNC_ATTRIBUTE struct sljit_jump* sljit_emit_cmp(struct sljit_compiler *compiler, sljit_si type,
841 sljit_si src1, sljit_sw src1w,
842 sljit_si src2, sljit_sw src2w);
843
844 /* Basic floating point comparison. In most architectures it is implemented as
845 an SLJIT_FCMP operation (setting appropriate flags) followed by a
846 sljit_emit_jump. However some architectures (i.e: MIPS) may employ
847 special optimizations here. It is suggested to use this comparison form
848 when appropriate.
849 type must be between SLJIT_C_FLOAT_EQUAL and SLJIT_C_FLOAT_ORDERED
850 type can be combined (or'ed) with SLJIT_REWRITABLE_JUMP and SLJIT_SINGLE_OP
851 Flags: destroy flags.
852 Note: if either operand is NaN, the behaviour is undefined for
853 type <= SLJIT_C_FLOAT_LESS_EQUAL. */
854 SLJIT_API_FUNC_ATTRIBUTE struct sljit_jump* sljit_emit_fcmp(struct sljit_compiler *compiler, sljit_si type,
855 sljit_si src1, sljit_sw src1w,
856 sljit_si src2, sljit_sw src2w);
857
858 /* Set the destination of the jump to this label. */
859 SLJIT_API_FUNC_ATTRIBUTE void sljit_set_label(struct sljit_jump *jump, struct sljit_label* label);
860 /* Set the destination address of the jump to this label. */
861 SLJIT_API_FUNC_ATTRIBUTE void sljit_set_target(struct sljit_jump *jump, sljit_uw target);
862
863 /* Call function or jump anywhere. Both direct and indirect form
864 type must be between SLJIT_JUMP and SLJIT_CALL3
865 Direct form: set src to SLJIT_IMM() and srcw to the address
866 Indirect form: any other valid addressing mode
867 Flags: - (never set any flags) for unconditional jumps.
868 Flags: destroy all flags for calls. */
869 SLJIT_API_FUNC_ATTRIBUTE sljit_si sljit_emit_ijump(struct sljit_compiler *compiler, sljit_si type, sljit_si src, sljit_sw srcw);
870
871 /* Perform the operation using the conditional flags as the second argument.
872 Type must always be between SLJIT_C_EQUAL and SLJIT_C_FLOAT_ORDERED. The
873 value represented by the type is 1, if the condition represented by the type
874 is fulfilled, and 0 otherwise.
875
876 If op == SLJIT_MOV, SLJIT_MOV_SI, SLJIT_MOV_UI:
877 Set dst to the value represented by the type (0 or 1).
878 Src must be SLJIT_UNUSED, and srcw must be 0
879 Flags: - (never set any flags)
880 If op == SLJIT_OR, op == SLJIT_AND, op == SLJIT_XOR
881 Performs the binary operation using src as the first, and the value
882 represented by type as the second argument.
883 Important note: only dst=src and dstw=srcw is supported at the moment!
884 Flags: I | E | K
885 Note: sljit_emit_op_flags does nothing, if dst is SLJIT_UNUSED (regardless of op). */
886 SLJIT_API_FUNC_ATTRIBUTE sljit_si sljit_emit_op_flags(struct sljit_compiler *compiler, sljit_si op,
887 sljit_si dst, sljit_sw dstw,
888 sljit_si src, sljit_sw srcw,
889 sljit_si type);
890
891 /* Copies the base address of SLJIT_LOCALS_REG+offset to dst.
892 Flags: - (never set any flags) */
893 SLJIT_API_FUNC_ATTRIBUTE sljit_si sljit_get_local_base(struct sljit_compiler *compiler, sljit_si dst, sljit_sw dstw, sljit_sw offset);
894
895 /* The constant can be changed runtime (see: sljit_set_const)
896 Flags: - (never set any flags) */
897 SLJIT_API_FUNC_ATTRIBUTE struct sljit_const* sljit_emit_const(struct sljit_compiler *compiler, sljit_si dst, sljit_sw dstw, sljit_sw init_value);
898
899 /* After the code generation the address for label, jump and const instructions
900 are computed. Since these structures are freed by sljit_free_compiler, the
901 addresses must be preserved by the user program elsewere. */
902 static SLJIT_INLINE sljit_uw sljit_get_label_addr(struct sljit_label *label) { return label->addr; }
903 static SLJIT_INLINE sljit_uw sljit_get_jump_addr(struct sljit_jump *jump) { return jump->addr; }
904 static SLJIT_INLINE sljit_uw sljit_get_const_addr(struct sljit_const *const_) { return const_->addr; }
905
906 /* Only the address is required to rewrite the code. */
907 SLJIT_API_FUNC_ATTRIBUTE void sljit_set_jump_addr(sljit_uw addr, sljit_uw new_addr);
908 SLJIT_API_FUNC_ATTRIBUTE void sljit_set_const(sljit_uw addr, sljit_sw new_constant);
909
910 /* --------------------------------------------------------------------- */
911 /* Miscellaneous utility functions */
912 /* --------------------------------------------------------------------- */
913
914 #define SLJIT_MAJOR_VERSION 0
915 #define SLJIT_MINOR_VERSION 91
916
917 /* Get the human readable name of the platform. Can be useful on platforms
918 like ARM, where ARM and Thumb2 functions can be mixed, and
919 it is useful to know the type of the code generator. */
920 SLJIT_API_FUNC_ATTRIBUTE SLJIT_CONST char* sljit_get_platform_name(void);
921
922 /* Portable helper function to get an offset of a member. */
923 #define SLJIT_OFFSETOF(base, member) ((sljit_sw)(&((base*)0x10)->member) - 0x10)
924
925 #if (defined SLJIT_UTIL_GLOBAL_LOCK && SLJIT_UTIL_GLOBAL_LOCK)
926 /* This global lock is useful to compile common functions. */
927 SLJIT_API_FUNC_ATTRIBUTE void SLJIT_CALL sljit_grab_lock(void);
928 SLJIT_API_FUNC_ATTRIBUTE void SLJIT_CALL sljit_release_lock(void);
929 #endif
930
931 #if (defined SLJIT_UTIL_STACK && SLJIT_UTIL_STACK)
932
933 /* The sljit_stack is a utiliy feature of sljit, which allocates a
934 writable memory region between base (inclusive) and limit (exclusive).
935 Both base and limit is a pointer, and base is always <= than limit.
936 This feature uses the "address space reserve" feature
937 of modern operating systems. Basically we don't need to allocate a
938 huge memory block in one step for the worst case, we can start with
939 a smaller chunk and extend it later. Since the address space is
940 reserved, the data never copied to other regions, thus it is safe
941 to store pointers here. */
942
943 /* Note: The base field is aligned to PAGE_SIZE bytes (usually 4k or more).
944 Note: stack growing should not happen in small steps: 4k, 16k or even
945 bigger growth is better.
946 Note: this structure may not be supported by all operating systems.
947 Some kind of fallback mechanism is suggested when SLJIT_UTIL_STACK
948 is not defined. */
949
950 struct sljit_stack {
951 /* User data, anything can be stored here.
952 Starting with the same value as base. */
953 sljit_uw top;
954 /* These members are read only. */
955 sljit_uw base;
956 sljit_uw limit;
957 sljit_uw max_limit;
958 };
959
960 /* Returns NULL if unsuccessful.
961 Note: limit and max_limit contains the size for stack allocation
962 Note: the top field is initialized to base. */
963 SLJIT_API_FUNC_ATTRIBUTE struct sljit_stack* SLJIT_CALL sljit_allocate_stack(sljit_uw limit, sljit_uw max_limit);
964 SLJIT_API_FUNC_ATTRIBUTE void SLJIT_CALL sljit_free_stack(struct sljit_stack* stack);
965
966 /* Can be used to increase (allocate) or decrease (free) the memory area.
967 Returns with a non-zero value if unsuccessful. If new_limit is greater than
968 max_limit, it will fail. It is very easy to implement a stack data structure,
969 since the growth ratio can be added to the current limit, and sljit_stack_resize
970 will do all the necessary checks. The fields of the stack are not changed if
971 sljit_stack_resize fails. */
972 SLJIT_API_FUNC_ATTRIBUTE sljit_sw SLJIT_CALL sljit_stack_resize(struct sljit_stack* stack, sljit_uw new_limit);
973
974 #endif /* (defined SLJIT_UTIL_STACK && SLJIT_UTIL_STACK) */
975
976 #if !(defined SLJIT_INDIRECT_CALL && SLJIT_INDIRECT_CALL)
977
978 /* Get the entry address of a given function. */
979 #define SLJIT_FUNC_OFFSET(func_name) ((sljit_sw)func_name)
980
981 #else /* !(defined SLJIT_INDIRECT_CALL && SLJIT_INDIRECT_CALL) */
982
983 /* All JIT related code should be placed in the same context (library, binary, etc.). */
984
985 #define SLJIT_FUNC_OFFSET(func_name) (*(sljit_sw*)(void*)func_name)
986
987 /* For powerpc64, the function pointers point to a context descriptor. */
988 struct sljit_function_context {
989 sljit_sw addr;
990 sljit_sw r2;
991 sljit_sw r11;
992 };
993
994 /* Fill the context arguments using the addr and the function.
995 If func_ptr is NULL, it will not be set to the address of context
996 If addr is NULL, the function address also comes from the func pointer. */
997 SLJIT_API_FUNC_ATTRIBUTE void sljit_set_function_context(void** func_ptr, struct sljit_function_context* context, sljit_sw addr, void* func);
998
999 #endif /* !(defined SLJIT_INDIRECT_CALL && SLJIT_INDIRECT_CALL) */
1000
1001 #endif /* _SLJIT_LIR_H_ */

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