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lvm.h: added basic implementation of laikaV_execute

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CPunch 2022-03-21 14:59:04 -05:00
parent 26a1977609
commit af9cdfdaed
2 changed files with 60 additions and 3 deletions
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62
lib/include/lvm.h
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@ -7,13 +7,17 @@
simple, see the OP_* for avaliable opcodes and their expected arguments.
*/
#include <inttypes.h>
#include "lerror.h"
#define LAIKA_VM_CODESIZE 512
#define LAIKA_VM_STACKSIZE 64
#define LAIKA_VM_CONSTSIZE 32
struct sLaika_vm_val {
union {
int i;
uint8_t i;
void *ptr;
};
};
@ -29,10 +33,15 @@ struct sLaika_vm {
#define LAIKA_MAKE_VM_PTR(ptr) (struct sLaika_vm_val)({.ptr = ptr})
#define LAIKA_MAKE_VM(consts, code) (struct sLaika_vm)({.constList = consts, .code = code, .pc = 0})
#define LAIKA_MAKE_VM_IA(opcode, a) opcode, a
#define LAIKA_MAKE_VM_IAB(opcode, a, b) opcode, a, b
#define LAIKA_MAKE_VM_IABC(opcode, a, b, c) opcode, a, b, c
enum {
OP_EXIT,
OP_LOADCONST, /* stk_indx[uint8_t] = const_indx[uint8_t] */
OP_LOAD,
OP_READ, /* stk_indx[uint8_t] = *(int8_t*)stk_indx[uint8_t] */
OP_WRITE, /* *(uint8_t*)stk_indx[uint8_t] = stk_indx[uint8_t] */
/* arithmetic */
OP_ADD, /* stk_indx[uint8_t] = stk_indx[uint8_t] + stk_indx[uint8_t] */
@ -44,7 +53,54 @@ 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 += [uint8_t] */
};
inline void laikaV_execute(struct sLaika_vm *vm) {
#define READBYTE (vm->code[vm->pc++])
#define BINOP(x) { \
uint8_t a = READBYTE; \
uint8_t b = READBYTE; \
uint8_t c = READBYTE; \
vm->stack[a] = vm->stack[b].i x vm->stack[c].i; \
break; \
}
while (vm->code[vm->pc]) {
switch (vm->code[vm->pc++]) {
case OP_LOADCONST: {
uint8_t indx = READBYTE;
uint8_t constIndx = READBYTE;
vm->stack[indx] = vm->constList[constIndx];
break;
}
case OP_READ: {
uint8_t indx = READBYTE;
uint8_t ptr = READBYTE;
vm->stack[indx].i = *(uint8_t*)vm->stack[ptr].ptr;
break;
}
case OP_WRITE: {
uint8_t ptr = READBYTE;
uint8_t indx = READBYTE;
*(uint8_t*)vm->stack[ptr].ptr = vm->stack[indx].i;
break;
}
case OP_ADD: BINOP(+);
case OP_SUB: BINOP(-);
case OP_MUL: BINOP(*);
case OP_DIV: BINOP(/);
case OP_AND: BINOP(&);
case OP_OR: BINOP(|);
case OP_XOR: BINOP(^);
default:
LAIKA_ERROR("laikaV_execute: unknown opcode [%d]!", vm->code[vm->pc])
}
}
#undef READBYTE
#undef BINOP
}
#endif

1
lib/src/lvm.c Normal file
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@ -0,0 +1 @@
#include "lvm.h"