sljit-examples

What is this?

This is just my reminder project. I will write how to use sljit and a sample code as a useful code.

Basic Usage

Template

Here is the template to use sljit.

#include "sljitLir.h"

int main(void)
{
    /* set up */
    struct sljit_compiler *C = sljit_create_compiler();

    /* To support almost all architechtures */
    sljit_emit_enter(C, 0,
        SLJIT_ARG1(SW),         /* argument type */
        6,  /* scratch  : temporary R0-R5   */
        6,  /* saved    : safety    S0-S5   */
        6,  /* fscratch : temporary FR0-FR6 */
        0,  /* fsaved   : safety    -       */
        0   /* local    :                   */
    );

    /* end of code */
    sljit_emit_return(C, SLJIT_MOV, SLJIT_IMM, 0);

    /* generate code */
    void *code = sljit_generate_code(C);

    /* clean up */
    sljit_free_compiler(C);
    sljit_free_code(code);
    return 0;
}

Registers

Registers	Meaning
SLJIT_S[0-9]	Saved registers means 'safe' registers. registers whose preserve their values across function calls.
SLJIT_R[0-9]	Scratch registers means 'temporary used'. Registers whose may not preserve their values across function calls.

Operands

First parameter	Second parameter	Meaning
SLJIT_R*, SLJIT_S*	0	Temp/saved registers
SLJIT_IMM	Number	Immediate number
SLJIT_MEM	Address	In-mem data with Absolute address
SLJIT_MEM1(r)	Offset	In-mem data in [R + offset]
SLJIT_MEM2(r1, r2)	Shift(size)	In-mem array, R1 as base address, R2 as index, Shift as size(0 for bytes, 1 for shorts, 2 for 4bytes, 3 for 8bytes)

Instructions

sljit_emit_op1

|SLJIT_MOV|

sljit_emit_op2

|SLJIT_ADD| |SLJIT_SUB| |SLJIT_MUL|

sljit_emit_fop1

sljit_emit_fop2