trunk/sljit/sljitLir.h

/*
 *    Stack-less Just-In-Time compiler
 *
 *    Copyright 2009-2010 Zoltan Herczeg (hzmester@freemail.hu). All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification, are
 * permitted provided that the following conditions are met:
 *
 *   1. Redistributions of source code must retain the above copyright notice, this list of
 *      conditions and the following disclaimer.
 *
 *   2. Redistributions in binary form must reproduce the above copyright notice, this list
 *      of conditions and the following disclaimer in the documentation and/or other materials
 *      provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) AND CONTRIBUTORS ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
 * SHALL THE COPYRIGHT HOLDER(S) OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef _SLJIT_LIR_H_
#define _SLJIT_LIR_H_

/*
   ------------------------------------------------------------------------
    Stack-Less JIT compiler for multiple architectures (x86, ARM, PowerPC)
   ------------------------------------------------------------------------

   Short description
    Advantages:
      - The execution can be continued from any LIR instruction
        In other words, jump into and out of the code is safe
      - Both target of (conditional) jump and call instructions
        and constants can be dynamically modified during runtime
        - although it is not suggested to do it frequently
        - very effective to cache an important value once
      - A fixed stack space can be allocated for local variables
      - The compiler is thread-safe
    Disadvantages:
      - Limited number of registers (only 6+4 integer registers, max 3+2
        temporary and max 3+2 general, and 4 floating point registers)
    In practice:
      - This approach is very effective for interpreters
        - One of the general registers typically points to a stack interface
        - It can jump to any exception handler anytime (even for another
          function. It is safe for SLJIT.)
        - Fast paths can be modified during runtime reflecting the changes
          of the fastest execution path of the dynamic language
        - SLJIT supports complex memory addressing modes
        - mainly position independent code
      - Optimizations (perhaps later)
        - Only for basic blocks (when no labels inserted between LIR instructions)

    For valgrind users:
      - pass --smc-check=all argument to valgrind, since JIT is a "self-modifying code"
*/

#if !(defined SLJIT_NO_DEFAULT_CONFIG && SLJIT_NO_DEFAULT_CONFIG)
#include "sljitConfig.h"
#endif
#include "sljitConfigInternal.h"

/* --------------------------------------------------------------------- */
/*  Error codes                                                          */
/* --------------------------------------------------------------------- */

/* Indicates no error. */
#define SLJIT_SUCCESS                   0
/* After the call of sljit_generate_code(), the error code of the compiler
   is set to this value to avoid future sljit calls (in debug mode at least).
   The complier should be freed after sljit_generate_code(). */
#define SLJIT_ERR_COMPILED              1
/* Cannot allocate non executable memory. */
#define SLJIT_ERR_ALLOC_FAILED          2
/* Cannot allocate executable memory.
   Only for sljit_generate_code() */
#define SLJIT_ERR_EX_ALLOC_FAILED       3
/* return value for SLJIT_CONFIG_UNSUPPORTED empty architecture. */
#define SLJIT_ERR_UNSUPPORTED           4

/* --------------------------------------------------------------------- */
/*  Registers                                                            */
/* --------------------------------------------------------------------- */

#define SLJIT_UNUSED            0

/* Temporary (scratch) registers may not preserve their values across function calls. */
#define SLJIT_TEMPORARY_REG1    1
#define SLJIT_TEMPORARY_REG2    2
#define SLJIT_TEMPORARY_REG3    3
/* Note: Extra Registers cannot be used for memory addressing. */
/* Note: on x86-32, these registers are emulated (using stack loads & stores). */
#define SLJIT_TEMPORARY_EREG1   4
#define SLJIT_TEMPORARY_EREG2   5

/* General (saved) registers preserve their values across function calls. */
#define SLJIT_GENERAL_REG1      6
#define SLJIT_GENERAL_REG2      7
#define SLJIT_GENERAL_REG3      8
/* Note: Extra Registers cannot be used for memory addressing. */
/* Note: on x86-32, these registers are emulated (using stack loads & stores). */
#define SLJIT_GENERAL_EREG1     9
#define SLJIT_GENERAL_EREG2     10

/* Read-only register (cannot be the destination of an operation). */
/* Note: SLJIT_MEM2( ... , SLJIT_LOCALS_REG) is not supported (x86 limitation). */
/* Note: SLJIT_LOCALS_REG is not necessary the real stack pointer. See sljit_emit_enter. */
#define SLJIT_LOCALS_REG        11

/* Number of registers. */
#define SLJIT_NO_TMP_REGISTERS  5
#define SLJIT_NO_GEN_REGISTERS  5
#define SLJIT_NO_REGISTERS      11

/* Return with machine word. */

#define SLJIT_RETURN_REG        SLJIT_TEMPORARY_REG1

/* x86 prefers temporary registers for special purposes. If other
   registers are used such purpose, it costs a little performance
   drawback. It doesn't matter for other archs. */

#define SLJIT_PREF_SHIFT_REG    SLJIT_TEMPORARY_REG3

/* --------------------------------------------------------------------- */
/*  Floating point registers                                             */
/* --------------------------------------------------------------------- */

/* Note: SLJIT_UNUSED as destination is not valid for floating point
     operations, since they cannot be used for setting flags. */

/* Floating point operations are performed on double precision values. */

#define SLJIT_FLOAT_REG1        1
#define SLJIT_FLOAT_REG2        2
#define SLJIT_FLOAT_REG3        3
#define SLJIT_FLOAT_REG4        4

/* --------------------------------------------------------------------- */
/*  Main structures and functions                                        */
/* --------------------------------------------------------------------- */

struct sljit_memory_fragment {
        struct sljit_memory_fragment *next;
        sljit_uw used_size;
        sljit_ub memory[1];
};

struct sljit_label {
        struct sljit_label *next;
        sljit_uw addr;
        /* The maximum size difference. */
        sljit_uw size;
};

struct sljit_jump {
        struct sljit_jump *next;
        sljit_uw addr;
        sljit_w flags;
        union {
                sljit_uw target;
                struct sljit_label* label;
        } u;
};

struct sljit_const {
        struct sljit_const *next;
        sljit_uw addr;
};

struct sljit_compiler {
        int error;

        struct sljit_label *labels;
        struct sljit_jump *jumps;
        struct sljit_const *consts;
        struct sljit_label *last_label;
        struct sljit_jump *last_jump;
        struct sljit_const *last_const;

        struct sljit_memory_fragment *buf;
        struct sljit_memory_fragment *abuf;

        /* Used local registers. */
        int temporaries;
        /* Used general registers. */
        int generals;
        /* Local stack size. */
        int local_size;
        /* Code size. */
        sljit_uw size;

#if (defined SLJIT_CONFIG_X86_32 && SLJIT_CONFIG_X86_32)
        int args;
        int temporaries_start;
        int generals_start;
#endif

#if (defined SLJIT_CONFIG_X86_64 && SLJIT_CONFIG_X86_64)
        int mode32;
#ifdef _WIN64
        int has_locals;
#endif
#endif

#if (defined SLJIT_CONFIG_X86_32 && SLJIT_CONFIG_X86_32) || (defined SLJIT_CONFIG_X86_64 && SLJIT_CONFIG_X86_64)
        int flags_saved;
#endif

#if (defined SLJIT_CONFIG_ARM_V5 && SLJIT_CONFIG_ARM_V5)
        /* Constant pool handling. */
        sljit_uw *cpool;
        sljit_ub *cpool_unique;
        sljit_uw cpool_diff;
        sljit_uw cpool_fill;
        /* General fields. */
        /* Contains pointer, "ldr pc, [...]" pairs. */
        sljit_uw patches;
#endif

#if (defined SLJIT_CONFIG_ARM_V5 && SLJIT_CONFIG_ARM_V5) || (defined SLJIT_CONFIG_ARM_V7 && SLJIT_CONFIG_ARM_V7)
        /* Temporary fields. */
        sljit_uw shift_imm;
        int cache_arg;
        sljit_w cache_argw;
#endif

#if (defined SLJIT_CONFIG_ARM_THUMB2 && SLJIT_CONFIG_ARM_THUMB2)
        int cache_arg;
        sljit_w cache_argw;
#endif

#if (defined SLJIT_CONFIG_PPC_32 && SLJIT_CONFIG_PPC_32) || (defined SLJIT_CONFIG_PPC_64 && SLJIT_CONFIG_PPC_64)
        int has_locals;
        sljit_w imm;
        int cache_arg;
        sljit_w cache_argw;
#endif

#if (defined SLJIT_CONFIG_MIPS_32 && SLJIT_CONFIG_MIPS_32)
        int has_locals;
        int delay_slot;
        int cache_arg;
        sljit_w cache_argw;
#endif

#if (defined SLJIT_VERBOSE && SLJIT_VERBOSE)
        FILE* verbose;
#endif

#if (defined SLJIT_VERBOSE && SLJIT_VERBOSE) || (defined SLJIT_DEBUG && SLJIT_DEBUG)
        int skip_checks;
#endif
};

/* --------------------------------------------------------------------- */
/*  Main functions                                                       */
/* --------------------------------------------------------------------- */

/* Creates an sljit compiler.
   Returns NULL if failed. */
SLJIT_API_FUNC_ATTRIBUTE struct sljit_compiler* sljit_create_compiler(void);
/* Free everything except the codes. */
SLJIT_API_FUNC_ATTRIBUTE void sljit_free_compiler(struct sljit_compiler *compiler);

static SLJIT_INLINE int sljit_get_compiler_error(struct sljit_compiler *compiler) { return compiler->error; }

/*
   Allocate a small amount of memory. The size must be <= 64 bytes on 32 bit,
   and <= 128 bytes on 64 bit architectures. The memory area is owned by the compiler,
   and freed by sljit_free_compiler. The returned pointer is sizeof(sljit_w) aligned.
   Excellent for allocating small blocks during the compiling, and no need to worry
   about freeing them. The size is enough to contain at most 16 pointers.
   If the size is outside of the range, the function will return with NULL,
   but this return value does not indicate that there is no more memory (does
   not set the compiler to out-of-memory status).
*/
SLJIT_API_FUNC_ATTRIBUTE void* sljit_alloc_memory(struct sljit_compiler *compiler, int size);

#if (defined SLJIT_VERBOSE && SLJIT_VERBOSE)
/* Passing NULL disables verbose. */
SLJIT_API_FUNC_ATTRIBUTE void sljit_compiler_verbose(struct sljit_compiler *compiler, FILE* verbose);
#endif

SLJIT_API_FUNC_ATTRIBUTE void* sljit_generate_code(struct sljit_compiler *compiler);
SLJIT_API_FUNC_ATTRIBUTE void sljit_free_code(void* code);

/* Instruction generation. Returns with error code. */

/*
   Entry instruction. The instruction has "args" number of arguments
   and will use the first "general" number of general registers.
   The arguments are passed into the general registers (arg1 to general_reg1, and so on).
   Thus, "args" must be less or equal than "general". A local_size extra
   stack space is allocated for the jit code (must be less or equal than
   SLJIT_MAX_LOCAL_SIZE), which can accessed through SLJIT_LOCALS_REG (see
   the notes there). SLJIT_LOCALS_REG is not necessary the real stack pointer!
   It just points somewhere in the stack if local_size > 0 (!). Thus, the only
   thing which is known that the memory area between SLJIT_LOCALS_REG and
   SLJIT_LOCALS_REG + local_size is a valid stack area if local_size > 0
*/

/* Note: multiple calls of this function overwrites the previous call. */

#define SLJIT_MAX_LOCAL_SIZE    65536

SLJIT_API_FUNC_ATTRIBUTE int sljit_emit_enter(struct sljit_compiler *compiler, int args, int temporaries, int generals, int local_size);

/* Since sljit_emit_return (and many asserts) uses variables which are initialized
   by sljit_emit_enter, a simple return is not possible if these variables are not
   initialized. sljit_fake_enter does not emit any instruction, just initialize
   those variables. */

/* Note: multiple calls of this function overwrites the previous call. */

SLJIT_API_FUNC_ATTRIBUTE void sljit_fake_enter(struct sljit_compiler *compiler, int args, int temporaries, int generals, int local_size);

/* Return from jit. See below the possible values for src and srcw. */
SLJIT_API_FUNC_ATTRIBUTE int sljit_emit_return(struct sljit_compiler *compiler, int src, sljit_w srcw);

/* Really fast calling method for utility functions inside sljit (see SLJIT_FAST_CALL).
   All registers and even the stack frame is passed to the callee. The return address is
   preserved in dst/dstw by sljit_emit_fast_enter, and sljit_emit_fast_return can
   use this as a return value later. */

/* Note: only for sljit specific, non ABI compilant calls. Fast, since only a few machine instructions
   are needed. Excellent for small uility functions, where saving general registers and setting up
   a new stack frame would cost too much performance. However, it is still possible to return
   to the address of the caller (or anywhere else). */

/* Note: flags are not changed (unlike sljit_emit_enter / sljit_emit_return). */

/* Note: although sljit_emit_fast_return could be replaced by an ijump, it is not suggested,
   since many architectures do clever branch prediction on call / return instruction pairs. */

SLJIT_API_FUNC_ATTRIBUTE int sljit_emit_fast_enter(struct sljit_compiler *compiler, int dst, sljit_w dstw, int args, int temporaries, int generals, int local_size);
SLJIT_API_FUNC_ATTRIBUTE int sljit_emit_fast_return(struct sljit_compiler *compiler, int src, sljit_w srcw);

/*
   Source and destination values for arithmetical instructions
    imm              - a simple immediate value (cannot be used as a destination)
    reg              - any of the registers (immediate argument must be 0)
    [imm]            - absolute immediate memory address
    [reg+imm]        - indirect memory address
    [reg+(reg<<imm)] - indirect indexed memory address (shift must be between 0 and 3)
                       useful for (byte, half, int, sljit_w) array access
                       (fully supported by both x86 and ARM architectures, and cheap operation on others)
*/

/*
   IMPORATNT NOTE: memory access MUST be naturally aligned.
     length | alignment
   ---------+-----------
     byte   | 1 byte (not aligned)
     half   | 2 byte (real_address & 0x1 == 0)
     int    | 4 byte (real_address & 0x3 == 0)
    sljit_w | 4 byte if SLJIT_32BIT_ARCHITECTURE defined
            | 8 byte if SLJIT_64BIT_ARCHITECTURE defined
   (This is a strict requirement for embedded systems.)

   Note: different architectures have different addressing limitations
         Thus sljit may generate several instructions for other addressing modes
   x86:  all addressing modes supported, but write-back is not supported
         (requires an extra instruction). On x86-64 only 32 bit signed
         integers are supported by the architecture.
   arm:  [reg+imm] supported for small immediates (-4095 <= imm <= 4095
         or -255 <= imm <= 255 for loading signed bytes, any halfs or doubles)
         [reg+(reg<<imm)] are supported or requires only two instructions
         Write back is limited to small immediates on thumb2
   ppc:  [reg+imm], -65535 <= imm <= 65535. 64 bit moves requires immediates
         divisible by 4. [reg+reg] supported, write-back supported
         [reg+(reg<<imm)] (imm != 0) is cheap (requires two instructions)
*/

/* Register output: simply the name of the register.
   For destination, you can use SLJIT_UNUSED as well. */
#define SLJIT_MEM               0x100
#define SLJIT_MEM0()            (SLJIT_MEM)
#define SLJIT_MEM1(r1)          (SLJIT_MEM | (r1))
#define SLJIT_MEM2(r1, r2)      (SLJIT_MEM | (r1) | ((r2) << 4))
#define SLJIT_IMM               0x200

/* Set 32 bit operation mode (I) on 64 bit CPUs. The flag is totally ignored on
   32 bit CPUs. The arithmetic instruction uses only the lower 32 bit of the
   input register(s), and set the flags according to the 32 bit result. If the
   destination is a register, the higher 32 bit of the result is undefined.
   The addressing modes (SLJIT_MEM1/SLJIT_MEM2 macros) are unaffected by this flag. */
#define SLJIT_INT_OP            0x100

/* Common CPU status flags for all architectures (x86, ARM, PPC)
    - carry flag
    - overflow flag
    - zero flag
    - negative/positive flag (depends on arc)
   On mips, these flags are emulated by software. */

/* By default, the instructions may, or may not set the CPU status flags.
   Forcing to set or keep status flags can be done with the following flags: */

/* Note: sljit tries to emit the minimum number of instructions. Using these
   flags can increase them, so use them wisely to avoid unnecessary code generation. */

/* Set Equal (Zero) status flag (E). */
#define SLJIT_SET_E                     0x0200
/* Set signed status flag (S). */
#define SLJIT_SET_S                     0x0400
/* Set unsgined status flag (U). */
#define SLJIT_SET_U                     0x0800
/* Set signed overflow flag (O). */
#define SLJIT_SET_O                     0x1000
/* Set carry flag (C).
   Note: Kinda unsigned overflow, but behaves differently on various cpus. */
#define SLJIT_SET_C                     0x2000
/* Do not modify the flags (K).
   Note: This flag cannot be combined with any other SLJIT_SET_* flag. */
#define SLJIT_KEEP_FLAGS                0x4000

/* Notes:
     - you cannot postpone conditional jump instructions except if noted that
       the instruction does not set flags (See: SLJIT_KEEP_FLAGS).
     - flag combinations: '|' means 'logical or'. */

/* Flags: - (never set any flags)
   Note: breakpoint instruction is not supported by all architectures (namely ppc)
         It falls back to SLJIT_NOP in those cases. */
#define SLJIT_BREAKPOINT                0
/* Flags: - (never set any flags)
   Note: may or may not cause an extra cycle wait
         it can even decrease the runtime in a few cases. */
#define SLJIT_NOP                       1

SLJIT_API_FUNC_ATTRIBUTE int sljit_emit_op0(struct sljit_compiler *compiler, int op);

/* Notes for MOV instructions:
   U = Mov with update (post form). If source or destination defined as SLJIT_MEM1(r1)
       or SLJIT_MEM2(r1, r2), r1 is increased by the sum of r2 and the constant argument
   UB = unsigned byte (8 bit)
   SB = signed byte (8 bit)
   UH = unsgined half (16 bit)
   SH = unsgined half (16 bit) */

/* Flags: - (never set any flags) */
#define SLJIT_MOV                       2
/* Flags: - (never set any flags) */
#define SLJIT_MOV_UB                    3
/* Flags: - (never set any flags) */
#define SLJIT_MOV_SB                    4
/* Flags: - (never set any flags) */
#define SLJIT_MOV_UH                    5
/* Flags: - (never set any flags) */
#define SLJIT_MOV_SH                    6
/* Flags: - (never set any flags) */
#define SLJIT_MOV_UI                    7
/* Flags: - (never set any flags) */
#define SLJIT_MOV_SI                    8
/* Flags: - (never set any flags) */
#define SLJIT_MOVU                      9
/* Flags: - (never set any flags) */
#define SLJIT_MOVU_UB                   10
/* Flags: - (never set any flags) */
#define SLJIT_MOVU_SB                   11
/* Flags: - (never set any flags) */
#define SLJIT_MOVU_UH                   12
/* Flags: - (never set any flags) */
#define SLJIT_MOVU_SH                   13
/* Flags: - (never set any flags) */
#define SLJIT_MOVU_UI                   14
/* Flags: - (never set any flags) */
#define SLJIT_MOVU_SI                   15
/* Flags: I | E | K */
#define SLJIT_NOT                       16
/* Flags: I | E | O | K */
#define SLJIT_NEG                       17
/* Count leading zeroes
   Flags: I | E | K */
#define SLJIT_CLZ                       18

SLJIT_API_FUNC_ATTRIBUTE int sljit_emit_op1(struct sljit_compiler *compiler, int op,
        int dst, sljit_w dstw,
        int src, sljit_w srcw);

/* Flags: I | E | O | C | K */
#define SLJIT_ADD                       19
/* Flags: I | C | K */
#define SLJIT_ADDC                      20
/* Flags: I | E | S | U | O | C | K */
#define SLJIT_SUB                       21
/* Flags: I | C | K */
#define SLJIT_SUBC                      22
/* Note: integer mul */
/* Flags: I | O (see SLJIT_C_MUL_*) | K */
#define SLJIT_MUL                       23
/* Flags: I | E | K */
#define SLJIT_AND                       24
/* Flags: I | E | K */
#define SLJIT_OR                        25
/* Flags: I | E | K */
#define SLJIT_XOR                       26
/* Flags: I | E | K */
#define SLJIT_SHL                       27
/* Flags: I | E | K */
#define SLJIT_LSHR                      28
/* Flags: I | E | K */
#define SLJIT_ASHR                      29

SLJIT_API_FUNC_ATTRIBUTE int sljit_emit_op2(struct sljit_compiler *compiler, int op,
        int dst, sljit_w dstw,
        int src1, sljit_w src1w,
        int src2, sljit_w src2w);

SLJIT_API_FUNC_ATTRIBUTE int sljit_is_fpu_available(void);

/* Note: dst is the left and src is the right operand for SLJIT_FCMP.
   Note: NaN check is always performed. If SLJIT_C_FLOAT_NAN is set,
         the comparison result is unpredictable.
   Flags: E | S (see SLJIT_C_FLOAT_*) */
#define SLJIT_FCMP                      30
/* Flags: - (never set any flags) */
#define SLJIT_FMOV                      31
/* Flags: - (never set any flags) */
#define SLJIT_FNEG                      32
/* Flags: - (never set any flags) */
#define SLJIT_FABS                      33

SLJIT_API_FUNC_ATTRIBUTE int sljit_emit_fop1(struct sljit_compiler *compiler, int op,
        int dst, sljit_w dstw,
        int src, sljit_w srcw);

/* Flags: - (never set any flags) */
#define SLJIT_FADD                      34
/* Flags: - (never set any flags) */
#define SLJIT_FSUB                      35
/* Flags: - (never set any flags) */
#define SLJIT_FMUL                      36
/* Flags: - (never set any flags) */
#define SLJIT_FDIV                      37

SLJIT_API_FUNC_ATTRIBUTE int sljit_emit_fop2(struct sljit_compiler *compiler, int op,
        int dst, sljit_w dstw,
        int src1, sljit_w src1w,
        int src2, sljit_w src2w);

/* Label and jump instructions. */

SLJIT_API_FUNC_ATTRIBUTE struct sljit_label* sljit_emit_label(struct sljit_compiler *compiler);

/* Invert conditional instruction: xor (^) with 0x1 */
#define SLJIT_C_EQUAL                   0
#define SLJIT_C_ZERO                    0
#define SLJIT_C_NOT_EQUAL               1
#define SLJIT_C_NOT_ZERO                1

#define SLJIT_C_LESS                    2
#define SLJIT_C_GREATER_EQUAL           3
#define SLJIT_C_GREATER                 4
#define SLJIT_C_LESS_EQUAL              5
#define SLJIT_C_SIG_LESS                6
#define SLJIT_C_SIG_GREATER_EQUAL       7
#define SLJIT_C_SIG_GREATER             8
#define SLJIT_C_SIG_LESS_EQUAL          9

#define SLJIT_C_OVERFLOW                10
#define SLJIT_C_NOT_OVERFLOW            11

#define SLJIT_C_MUL_OVERFLOW            12
#define SLJIT_C_MUL_NOT_OVERFLOW        13

#define SLJIT_C_FLOAT_EQUAL             14
#define SLJIT_C_FLOAT_NOT_EQUAL         15
#define SLJIT_C_FLOAT_LESS              16
#define SLJIT_C_FLOAT_GREATER_EQUAL     17
#define SLJIT_C_FLOAT_GREATER           18
#define SLJIT_C_FLOAT_LESS_EQUAL        19
#define SLJIT_C_FLOAT_NAN               20
#define SLJIT_C_FLOAT_NOT_NAN           21

#define SLJIT_JUMP                      22
#define SLJIT_FAST_CALL                 23
#define SLJIT_CALL0                     24
#define SLJIT_CALL1                     25
#define SLJIT_CALL2                     26
#define SLJIT_CALL3                     27

/* Fast calling method. See sljit_emit_fast_enter / sljit_emit_fast_return. */

/* The target can be changed during runtime (see: sljit_set_jump_addr). */
#define SLJIT_REWRITABLE_JUMP           0x1000

/* Emit a jump instruction. The destination is not set, only the type of the jump.
    type must be between SLJIT_C_EQUAL and SLJIT_CALL3
    type can be combined (or'ed) with SLJIT_REWRITABLE_JUMP
   Flags: - (never set any flags) for both conditional and unconditional jumps.
   Flags: destroy all flags for calls. */
SLJIT_API_FUNC_ATTRIBUTE struct sljit_jump* sljit_emit_jump(struct sljit_compiler *compiler, int type);

/* Basic arithmetic comparison. In most architectures it is equal to
   an SLJIT_SUB operation (with SLJIT_UNUSED destination) followed by a
   sljit_emit_jump. However some architectures (i.e: MIPS) may employ
   special optimizations here. It is suggested to use this comparison
   form when flags are unimportant.
    type must be between SLJIT_C_EQUAL and SLJIT_C_SIG_LESS_EQUAL
    type can be combined (or'ed) with SLJIT_REWRITABLE_JUMP or SLJIT_INT_OP
   Flags: destroy flags. */
SLJIT_API_FUNC_ATTRIBUTE struct sljit_jump* sljit_emit_cmp(struct sljit_compiler *compiler, int type,
        int src1, sljit_w src1w,
        int src2, sljit_w src2w);

/* Set the destination of the jump to this label. */
SLJIT_API_FUNC_ATTRIBUTE void sljit_set_label(struct sljit_jump *jump, struct sljit_label* label);
/* Only for jumps defined with SLJIT_REWRITABLE_JUMP flag.
   Note: use sljit_emit_ijump for fixed jumps. */
SLJIT_API_FUNC_ATTRIBUTE void sljit_set_target(struct sljit_jump *jump, sljit_uw target);

/* Call function or jump anywhere. Both direct and indirect form
    type must be between SLJIT_JUMP and SLJIT_CALL3
    Direct form: set src to SLJIT_IMM() and srcw to the address
    Indirect form: any other valid addressing mode
   Flags: - (never set any flags) for unconditional jumps.
   Flags: destroy all flags for calls. */
SLJIT_API_FUNC_ATTRIBUTE int sljit_emit_ijump(struct sljit_compiler *compiler, int type, int src, sljit_w srcw);

/* If op == SLJIT_MOV:
     Set dst to 1 if condition is fulfilled, 0 otherwise
       type must be between SLJIT_C_EQUAL and SLJIT_C_FLOAT_NOT_NAN
     Flags: - (never set any flags)
   If op == SLJIT_OR
     Dst is used as src as well, and set its lowest bit to 1 if
     the condition is fulfilled. Otherwise it does nothing.
     Flags: E | K
   Note: sljit_emit_cond_value does nothing, if dst is SLJIT_UNUSED (regardless of op). */
SLJIT_API_FUNC_ATTRIBUTE int sljit_emit_cond_value(struct sljit_compiler *compiler, int op, int dst, sljit_w dstw, int type);

/* The constant can be changed runtime (see: sljit_set_const)
   Flags: - (never set any flags) */
SLJIT_API_FUNC_ATTRIBUTE struct sljit_const* sljit_emit_const(struct sljit_compiler *compiler, int dst, sljit_w dstw, sljit_w init_value);

/* After the code generation the address for label, jump and const instructions
   are computed. Since these structures are freed sljit_free_compiler, the
   addresses must be preserved by the user program elsewere. */
static SLJIT_INLINE sljit_uw sljit_get_label_addr(struct sljit_label *label) { return label->addr; }
static SLJIT_INLINE sljit_uw sljit_get_jump_addr(struct sljit_jump *jump) { return jump->addr; }
static SLJIT_INLINE sljit_uw sljit_get_const_addr(struct sljit_const *const_) { return const_->addr; }

/* Only the address is required to rewrite the code. */
SLJIT_API_FUNC_ATTRIBUTE void sljit_set_jump_addr(sljit_uw addr, sljit_uw new_addr);
SLJIT_API_FUNC_ATTRIBUTE void sljit_set_const(sljit_uw addr, sljit_w new_constant);

/* --------------------------------------------------------------------- */
/*  Miscellaneous utility functions                                      */
/* --------------------------------------------------------------------- */

#define SLJIT_MAJOR_VERSION     0
#define SLJIT_MINOR_VERSION     82

/* Get the human readable name of the platfrom.
   Can be useful for debugging on platforms like ARM, where ARM and
   Thumb2 functions can be mixed. */
SLJIT_API_FUNC_ATTRIBUTE SLJIT_CONST char* sljit_get_platform_name(void);

/* Portble helper function to get an offset of a member. */
#define SLJIT_OFFSETOF(base, member)    ((sljit_w)(&((base*)0x10)->member) - 0x10)

#if (defined SLJIT_UTIL_GLOBAL_LOCK && SLJIT_UTIL_GLOBAL_LOCK)
/* This global lock is useful to compile common functions. */
SLJIT_API_FUNC_ATTRIBUTE void SLJIT_CALL sljit_grab_lock(void);
SLJIT_API_FUNC_ATTRIBUTE void SLJIT_CALL sljit_release_lock(void);
#endif

#if (defined SLJIT_UTIL_STACK && SLJIT_UTIL_STACK)

/* The sljit_stack is a utiliy feature of sljit, which allocates a
   writable memory region between base (inclusive) and limit (exclusive).
   Both base and limit is a pointer, and base is always <= than limit.
   This feature uses the "address space reserve" feature
   of modern operating systems. Basically we don't need to allocate a
   huge memory block in one step for the worst case, we can start with
   a smaller chunk and extend it later. Since the address space is
   reserved, the data never copied to other regions, thus it is safe
   to store pointers here. */

/* Note: The base field is aligned to PAGE_SIZE bytes (usually 4k or more).
   Note: stack growing should not happen in small steps: 4k, 16k or even
     bigger growth is better.
   Note: this structure may not be supported by all operating systems.
     Some kind of fallback mechanism is suggested when SLJIT_UTIL_STACK
     is not defined. */

struct sljit_stack {
        /* User data, anything can be stored here.
           Starting with the same value as base. */
        sljit_uw top;
        /* These members are read only. */
        sljit_uw base;
        sljit_uw limit;
        sljit_uw max_limit;
};

/* Returns NULL if unsuccessful.
   Note: limit and max_limit contains the size for stack allocation
   Note: the top field is initialized to base. */
SLJIT_API_FUNC_ATTRIBUTE struct sljit_stack* SLJIT_CALL sljit_allocate_stack(sljit_uw limit, sljit_uw max_limit);
SLJIT_API_FUNC_ATTRIBUTE void SLJIT_CALL sljit_free_stack(struct sljit_stack* stack);

/* Can be used to increase (allocate) or decrease (free) the memory area.
   Returns with a non-zero value if unsuccessful. If new_limit is greater than
   max_limit, it will fail. It is very easy to implement a stack data structure,
   since the growth ratio can be added to the current limit, and sljit_stack_resize
   will do all the necessary checks. The fields of the stack are not changed if
   sljit_stack_resize fails. */
SLJIT_API_FUNC_ATTRIBUTE sljit_w SLJIT_CALL sljit_stack_resize(struct sljit_stack* stack, sljit_uw new_limit);

#endif /* (defined SLJIT_UTIL_STACK && SLJIT_UTIL_STACK) */

#if !(defined SLJIT_INDIRECT_CALL && SLJIT_INDIRECT_CALL)

/* Get the entry address of a given function. */
#define SLJIT_FUNC_OFFSET(func_name)    ((sljit_w)func_name)

#else /* !(defined SLJIT_INDIRECT_CALL && SLJIT_INDIRECT_CALL) */

/* All JIT related code should be placed in the same context (library, binary, etc.). */

#define SLJIT_FUNC_OFFSET(func_name)    ((sljit_w)*(void**)func_name)

/* For powerpc64, the function pointers point to a context descriptor. */
struct sljit_function_context {
        sljit_w addr;
        sljit_w r2;
        sljit_w r11;
};

/* Fill the context arguments using the addr and the function.
   If func_ptr is NULL, it will not be set to the address of context
   If addr is NULL, the function address also comes from the func pointer. */
SLJIT_API_FUNC_ATTRIBUTE void sljit_set_function_context(void** func_ptr, struct sljit_function_context* context, sljit_w addr, void* func);

#endif /* !(defined SLJIT_INDIRECT_CALL && SLJIT_INDIRECT_CALL) */

#endif /* _SLJIT_LIR_H_ */