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VM: minor refacotring, added OP_TESTJMP & OP_DEBUG

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CPunch 2022-04-28 11:57:32 -05:00
parent 9cea98c86a
commit 4333d03a51
1 changed files with 29 additions and 3 deletions
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32
lib/include/lvm.h
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@ -30,7 +30,7 @@ struct sLaikaV_vm {
int pc;
};
#define LAIKA_MAKE_VM(consts, code) (struct sLaikaV_vm)({.constList = consts, .code = code, .pc = 0})
#define LAIKA_MAKE_VM(consts, code) (struct sLaikaV_vm)({.constList = consts, .code = code, .pc = 0, .stack = {}})
/* constants */
#define LAIKA_MAKE_VM_INT(i) (struct sLaikaV_vm_val)({.i = i})
@ -56,7 +56,12 @@ enum {
OP_XOR, /* stk_indx[uint8_t] = stk_indx[uint8_t] ^ stk_indx[uint8_t] */
/* control-flow */
OP_TESTJMP, /* if stk_indx[uint8_t] != 0, pc += [uint8_t] */
OP_TESTJMP, /* if stk_indx[uint8_t] != 0, pc += [int8_t] */
/* misc. */
#ifdef DEBUG
OP_DEBUG
#endif
};
LAIKA_FORCEINLINE void laikaV_execute(struct sLaikaV_vm *vm) {
@ -97,8 +102,29 @@ LAIKA_FORCEINLINE void laikaV_execute(struct sLaikaV_vm *vm) {
case OP_AND: BINOP(&);
case OP_OR: BINOP(|);
case OP_XOR: BINOP(^);
case OP_TESTJMP: {
uint8_t indx = READBYTE;
int8_t jmp = READBYTE;
/* if stack indx is true, jump by jmp (signed 8-bit int) */
if (vm->stack[indx].i)
vm->pc += jmp;
break;
}
#ifdef DEBUG
case OP_DEBUG: {
int i;
/* print stack info */
for (i = 0; i < LAIKA_VM_STACKSIZE; i++)
printf("[%03d] - 0x%02x\n", i, vm->stack[i].i);
break;
}
#endif
default:
LAIKA_ERROR("laikaV_execute: unknown opcode [%d]!", vm->code[vm->pc])
LAIKA_ERROR("laikaV_execute: unknown opcode [0x%02x]! pc: %d\n", vm->code[vm->pc], vm->pc);
}
}