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#include <stdint.h>
#include <stdlib.h>
#include <stdio.h>
#include <assert.h>
#include "fvm.h"
int fvm_init(struct fvm *vm, void *code, int64_t stack_size) {
void *stack_vm = malloc(stack_size);
vm->sp = (fvm_word_t)(stack_vm + stack_size);
vm->bp = vm->sp;
vm->pc = (fvm_word_t)code;
vm->rv = 0;
return 1;
}
void fvm_push(struct fvm *vm, fvm_word_t val) {
vm->sp -= sizeof(fvm_word_t);
fvm_store(vm, vm->sp, val);
}
int64_t fvm_pop(struct fvm *vm) {
int64_t r = fvm_load(vm, vm->sp);
vm->sp += sizeof(fvm_word_t);
return r;
}
void fvm_pushf(struct fvm *vm, fvm_float_t val) {
assert(sizeof(fvm_word_t) >= sizeof(fvm_float_t));
vm->sp -= sizeof(fvm_word_t);
fvm_storef(vm, vm->sp, val);
}
fvm_float_t fvm_popf(struct fvm *vm) {
assert(sizeof(fvm_word_t) >= sizeof(fvm_float_t));
fvm_float_t r = fvm_loadf(vm, vm->sp);
vm->sp += sizeof(fvm_word_t);
return r;
}
fvm_float_t fvm_loadf(struct fvm *vm, fvm_word_t addr) {
return *(fvm_float_t*)addr;
}
void fvm_storef(struct fvm *vm, fvm_word_t addr, fvm_float_t val) {
*(fvm_float_t*)addr = val;
}
fvm_word_t fvm_load(struct fvm *vm, fvm_word_t addr) {
return *(fvm_word_t*)addr;
}
void fvm_store(struct fvm *vm, fvm_word_t addr, int64_t value) {
*(fvm_word_t*)addr = value;
}
int32_t fvm_load32(struct fvm *vm, fvm_word_t addr) {
return *(int32_t*)addr;
}
void fvm_store32(struct fvm *vm, fvm_word_t addr, int32_t value) {
*(int32_t*)addr = value;
}
int16_t fvm_load16(struct fvm *vm, fvm_word_t addr) {
return *(int16_t*)addr;
}
void fvm_store16(struct fvm *vm, fvm_word_t addr, int16_t value) {
*(int16_t*)addr = value;
}
int8_t fvm_load8(struct fvm *vm, fvm_word_t addr) {
return *(int8_t*)addr;
}
void fvm_store8(struct fvm *vm, fvm_word_t addr, int8_t value) {
*(int8_t*)addr = value;
}
int64_t fvm_execute(struct fvm *vm) {
fvm_word_t a, b, c;
fvm_float_t x, y, z;
while (1) {
enum fvm_op op = (enum fvm_op)(uint8_t)fvm_load8(vm, vm->pc);
switch (op) {
case FVM_OP_SP:
a = vm->sp;
fvm_push(vm, a);
vm->pc++;
break;
case FVM_OP_SSP:
vm->sp = fvm_pop(vm);
vm->pc++;
break;
case FVM_OP_BP:
fvm_push(vm, vm->bp);
vm->pc++;
break;
case FVM_OP_SBP:
vm->bp = fvm_pop(vm);
vm->pc++;
break;
case FVM_OP_RV:
a = vm->rv;
fvm_push(vm, a);
vm->pc++;
break;
case FVM_OP_SRV:
vm->rv = fvm_pop(vm);
vm->pc++;
break;
case FVM_OP_PC:
fvm_push(vm, vm->pc);
vm->pc++;
break;
case FVM_OP_IMM:
fvm_push(vm, fvm_load(vm, vm->pc + 1));
vm->pc += sizeof(fvm_word_t) + 1;
break;
case FVM_OP_LD:
fvm_push(vm, fvm_load(vm, fvm_pop(vm)));
vm->pc++;
break;
case FVM_OP_LD32:
fvm_push(vm, fvm_load32(vm, fvm_pop(vm)));
vm->pc++;
break;
case FVM_OP_LD16:
fvm_push(vm, fvm_load16(vm, fvm_pop(vm)));
vm->pc++;
break;
case FVM_OP_LD8:
fvm_push(vm, fvm_load8(vm, fvm_pop(vm)));
vm->pc++;
break;
case FVM_OP_ST:
b = fvm_pop(vm);
a = fvm_pop(vm);
fvm_store(vm, b, a);
vm->pc++;
break;
case FVM_OP_ST32:
b = fvm_pop(vm);
a = fvm_pop(vm);
fvm_store32(vm, b, a);
vm->pc++;
break;
case FVM_OP_ST16:
b = fvm_pop(vm);
a = fvm_pop(vm);
fvm_store16(vm, b, a);
vm->pc++;
break;
case FVM_OP_ST8:
b = fvm_pop(vm);
a = fvm_pop(vm);
fvm_store8(vm, b, a);
vm->pc++;
break;
case FVM_OP_DUP:
a = fvm_pop(vm);
fvm_push(vm, a);
fvm_push(vm, a);
vm->pc++;
break;
case FVM_OP_POP:
fvm_pop(vm);
vm->pc++;
break;
case FVM_OP_SWAP:
a = fvm_pop(vm);
b = fvm_pop(vm);
fvm_push(vm, a);
fvm_push(vm, b);
vm->pc++;
break;
case FVM_OP_OVER:
a = fvm_pop(vm);
b = fvm_pop(vm);
fvm_push(vm, b);
fvm_push(vm, a);
fvm_push(vm, b);
vm->pc++;
break;
case FVM_OP_ROT:
a = fvm_pop(vm);
b = fvm_pop(vm);
c = fvm_pop(vm);
fvm_push(vm, b);
fvm_push(vm, a);
fvm_push(vm, c);
vm->pc++;
break;
case FVM_OP_ADD:
a = fvm_pop(vm);
b = fvm_pop(vm);
fvm_push(vm, a + b);
vm->pc++;
break;
case FVM_OP_SUB:
b = fvm_pop(vm);
a = fvm_pop(vm);
fvm_push(vm, a - b);
vm->pc++;
break;
case FVM_OP_MUL:
b = fvm_pop(vm);
a = fvm_pop(vm);
fvm_push(vm, a * b);
vm->pc++;
break;
case FVM_OP_DIV:
b = fvm_pop(vm);
a = fvm_pop(vm);
fvm_push(vm, a / b);
vm->pc++;
break;
case FVM_OP_MOD:
b = fvm_pop(vm);
a = fvm_pop(vm);
fvm_push(vm, a % b);
vm->pc++;
break;
case FVM_OP_SHR:
b = fvm_pop(vm);
a = fvm_pop(vm);
fvm_push(vm, (int64_t)(((uint64_t)a) >> b));
vm->pc++;
break;
case FVM_OP_SHL:
b = fvm_pop(vm);
a = fvm_pop(vm);
fvm_push(vm, a << b);
vm->pc++;
break;
case FVM_OP_SAR:
b = fvm_pop(vm);
a = fvm_pop(vm);
fvm_push(vm, a >> b);
vm->pc++;
break;
case FVM_OP_AND:
b = fvm_pop(vm);
a = fvm_pop(vm);
fvm_push(vm, a && b);
vm->pc++;
break;
case FVM_OP_OR:
b = fvm_pop(vm);
a = fvm_pop(vm);
fvm_push(vm, a || b);
vm->pc++;
break;
case FVM_OP_NOT:
a = fvm_pop(vm);
fvm_push(vm, !a);
vm->pc++;
break;
case FVM_OP_BITAND:
b = fvm_pop(vm);
a = fvm_pop(vm);
fvm_push(vm, a & b);
vm->pc++;
break;
case FVM_OP_BITOR:
b = fvm_pop(vm);
a = fvm_pop(vm);
fvm_push(vm, a | b);
vm->pc++;
break;
case FVM_OP_XOR:
b = fvm_pop(vm);
a = fvm_pop(vm);
fvm_push(vm, a ^ b);
vm->pc++;
break;
case FVM_OP_INVERT:
a = fvm_pop(vm);
fvm_push(vm, ~a);
vm->pc++;
break;
case FVM_OP_GE:
b = fvm_pop(vm);
a = fvm_pop(vm);
fvm_push(vm, a >= b);
vm->pc++;
break;
case FVM_OP_LE:
b = fvm_pop(vm);
a = fvm_pop(vm);
fvm_push(vm, a <= b);
vm->pc++;
break;
case FVM_OP_GT:
b = fvm_pop(vm);
a = fvm_pop(vm);
fvm_push(vm, a > b);
vm->pc++;
break;
case FVM_OP_LT:
b = fvm_pop(vm);
a = fvm_pop(vm);
fvm_push(vm, a < b);
vm->pc++;
break;
case FVM_OP_EQ:
b = fvm_pop(vm);
a = fvm_pop(vm);
fvm_push(vm, a == b);
vm->pc++;
break;
case FVM_OP_NEQ:
b = fvm_pop(vm);
a = fvm_pop(vm);
fvm_push(vm, a != b);
vm->pc++;
break;
case FVM_OP_JMP:
vm->pc = fvm_pop(vm);
break;
case FVM_OP_JZ:
b = fvm_pop(vm);
a = fvm_pop(vm);
if (a) {
vm->pc++;
break;
} else {
vm->pc = b;
break;
}
case FVM_OP_JNZ:
b = fvm_pop(vm);
a = fvm_pop(vm);
if (a) {
vm->pc = b;
break;
} else {
vm->pc++;
break;
}
case FVM_OP_CALL:
a = fvm_pop(vm);
fvm_push(vm, vm->pc);
vm->pc = a;
break;
case FVM_OP_RET:
a = fvm_pop(vm);
vm->pc = a;
break;
case FVM_OP_SYSCALL:
a = fvm_pop(vm);
vm->pc++;
(*(vm->syscall_table[a]))(vm);
break;
case FVM_OP_FADD:
y = fvm_popf(vm);
x = fvm_popf(vm);
fvm_pushf(vm, x + y);
vm->pc++;
break;
case FVM_OP_FSUB:
y = fvm_popf(vm);
x = fvm_popf(vm);
fvm_pushf(vm, x - y);
vm->pc++;
break;
case FVM_OP_FMUL:
y = fvm_popf(vm);
x = fvm_popf(vm);
fvm_pushf(vm, x * y);
vm->pc++;
break;
case FVM_OP_FDIV:
y = fvm_popf(vm);
x = fvm_popf(vm);
fvm_pushf(vm, x / y);
vm->pc++;
break;
case FVM_OP_FGE:
y = fvm_popf(vm);
x = fvm_popf(vm);
fvm_push(vm, x >= y);
vm->pc++;
break;
case FVM_OP_FGT:
y = fvm_popf(vm);
x = fvm_popf(vm);
fvm_push(vm, x > y);
vm->pc++;
break;
case FVM_OP_FLE:
y = fvm_popf(vm);
x = fvm_popf(vm);
fvm_push(vm, x <= y);
vm->pc++;
break;
case FVM_OP_FLT:
y = fvm_popf(vm);
x = fvm_popf(vm);
fvm_push(vm, x < y);
vm->pc++;
break;
case FVM_OP_FEQ:
y = fvm_popf(vm);
x = fvm_popf(vm);
fvm_push(vm, x == y);
vm->pc++;
break;
case FVM_OP_FNEQ:
y = fvm_popf(vm);
x = fvm_popf(vm);
fvm_push(vm, x != y);
vm->pc++;
break;
case FVM_OP_FTI:
x = fvm_popf(vm);
fvm_push(vm, (fvm_word_t)x);
vm->pc++;
break;
case FVM_OP_ITF:
a = fvm_pop(vm);
fvm_pushf(vm, (fvm_float_t)x);
vm->pc++;
break;
case FVM_OP_EXIT:
return vm->rv;
default:
fprintf(stderr, "unknown opcode.\n");
break;
}
}
return -1;
}
|
