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#include <stddef.h>
#include <stdint.h>
#include <stdlib.h>
#include <stdbool.h>
#include <stdio.h>
#include <math.h>
#include "val.h"
#include "vm.h"
#include "mem.h"
#include "dis.h"
Chunk chunk_new(State *S) {
return (Chunk){ 0 };
}
size_t chunk_wbc(State *S, Chunk *ch, uint8_t byte) {
if (ch->bc.len == ch->bc.cap) {
size_t newsz = (ch->bc.cap == 0 ? 8 : ch->bc.cap * 2);
ch->bc.d = RENEW_ARR(S, ch->bc.d, uint8_t, ch->bc.cap, newsz);
ch->bc.cap = newsz;
}
size_t ix = ch->bc.len;
ch->bc.d[ix] = byte;
ch->bc.len ++;
return ix;
}
size_t chunk_wconst(State *S, Chunk *ch, Val v) {
if (ch->consts.len == ch->consts.cap) {
size_t newsz = (ch->consts.cap == 0 ? 8 : ch->consts.cap *2);
ch->consts.d = RENEW_ARR(S, ch->consts.d, Val, ch->consts.cap, newsz);
ch->consts.cap = newsz;
}
size_t ix = ch->consts.len;
ch->consts.d[ix] = v;
ch->consts.len ++;
return ix;
}
Thread thread_new(State *S) {
Thread th = (Thread){ 0 };
for (int i = 0; i < STACKSIZE; i++) {
th.stack[i] = VAL_NIL;
}
return th;
}
int runvm(State *S) {
Thread *th = S->th;
Chunk *ch = th->ch;
int status = 1;
disasm_chunk(ch);
#define RBYTE() (ch->bc.d[th->ip++])
#define RSHORT() (th->ip += 2, (uint16_t)( ch->bc.d[th->ip-2] | ch->bc.d[th->ip-1] << 8 ))
#define PUSH(v) th->stack[th->sp++] = v;
#define POP() (th->stack[--th->sp])
#define PEEK() (th->stack[th->sp-1])
puts("---");
while (1) {
uint8_t instr = RBYTE();
switch (instr) {
case OP_RET:
status = 0;
printf("done!\n");
goto done;
break;
case OP_LOADK: {
uint8_t cix = RBYTE();
Val v = ch->consts.d[cix];
PUSH(v);
// printf(" (pushing ");
// print_val(v);
// printf(")\n");
break;
}
case OP_PRINT:
println_val(PEEK());
break;
case OP_DROP:
--th->sp;
break;
case OP_SKIP: {
uint16_t offset = RSHORT();
th->ip += offset;
break;
}
case OP_REDO: {
uint16_t offset = RSHORT();
th->ip -= offset;
break;
}
case OP_0BRANCH: {
uint16_t offset = RSHORT();
bool cond = is_truthy(POP());
if (!cond)
th->ip += offset;
break;
}
case OP_GETGLOBAL: {
uint8_t cix = RBYTE();
Val varname = ch->consts.d[cix];
if (!IS_STRING(varname)) {
printf("global names must be string, not %s\n",
typename_str(varname));
goto done;
}
Val v = ht_get(S, &S->globals, AS_STRING(varname));
PUSH(v);
break;
}
case OP_SETGLOBAL: {
uint8_t cix = RBYTE();
Val varname = ch->consts.d[cix];
if (!IS_STRING(varname)) {
printf("global names must be string, not %s\n",
typename_str(varname));
goto done;
}
Val v = PEEK();
ht_put(S, &S->globals, AS_STRING(varname), v);
break;
}
#define BINARY_OP(opcode, OP, RET_TYPE) \
case opcode: { \
Val b = POP(); \
Val a = POP(); \
if (!IS_NUM(a) || !IS_NUM(b)) { \
printf("can't do arithmetic on %s and %s\n", \
typename_str(a), typename_str(b)); \
goto done; \
} \
PUSH(RET_TYPE(AS_NUM(a) OP AS_NUM(b))); \
} \
break;
#define ARITH_OP(opcode, OP) BINARY_OP(opcode, OP, VAL_NUM)
#define BOOL_OP(opcode, OP) BINARY_OP(opcode, OP, VAL_BOOL)
ARITH_OP(OP_ADD, +)
ARITH_OP(OP_SUB, -)
ARITH_OP(OP_MUL, *)
ARITH_OP(OP_DIV, /)
BOOL_OP(OP_EQU, ==)
BOOL_OP(OP_CMP, <)
#undef BINARY_OP
#undef ARITH_OP
#undef BOOL_OP
case OP_MOD: {
Val b = POP();
Val a = POP();
if (!IS_NUM(a) || !IS_NUM(b)) {
printf("can't do arithmetic on %s and %s",
typename_str(a), typename_str(b));
goto done;
}
PUSH(VAL_NUM(fmod(AS_NUM(a), AS_NUM(b))));
}
break;
case OP_NIL: PUSH(VAL_NIL); break;
case OP_TRUE: PUSH(VAL_TRUE); break;
case OP_FALSE: PUSH(VAL_FALSE); break;
}
}
done:;
return status;
}
#undef RBYTE
#undef RSHORT
#undef PUSH
#undef POP
#undef PEEK
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