123 lines
2.1 KiB
C
123 lines
2.1 KiB
C
#include "vm.h"
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#include "lib/commons.h"
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#include "lib/type.h"
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void vm_init(vm_t* vm, err_t* err)
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{
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assert(vm);
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vm->pc = 0;
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vm->bp = 0;
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vm->sp = 0;
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vm->err = err;
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}
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void vm_free(vm_t* vm)
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{
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assert(vm);
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}
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param_t vm_pop(vm_t* vm)
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{
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assert(vm);
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assert(vm->sp > 0);
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param_t param = vm->stack[vm->sp - 1];
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vm->sp--;
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return param;
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}
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size_t vm_stack_str(vm_t* vm, char* buffer, size_t size)
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{
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assert(vm);
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assert(buffer);
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size_t sz = 0;
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for (size_t i=0; i<vm->sp; i++)
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{
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sz += snprintf(buffer + sz, size - sz, "| %d |\n", vm->stack[vm->sp - 1 - i]);
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}
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return sz;
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}
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int vm_exec_mod(vm_t* vm, mod_t* mod)
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{
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assert(vm);
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vm->pc = 0;
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while (vm->pc < mod->program.size)
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{
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int status = vm_exec_instr(vm,
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mod,
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mod->program.ops[vm->pc],
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mod->program.params[vm->pc]);
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if (status != 0)
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{
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return status;
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}
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}
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return 0;
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}
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int vm_exec_instr(vm_t* vm, mod_t* mod, Opcode op, param_t param)
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{
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assert(vm);
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switch (op)
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{
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case OP_PUSH: {
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if (vm->sp + 1 >= RZ_STACK_LIMIT)
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{
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fprintf(stderr, "Stack overflow\n");
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abort();
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}
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vm->stack[vm->sp] = param;
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vm->sp++;
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vm->pc++;
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} break;
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case OP_ASSERT: {
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param_t top = vm_pop(vm);
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value_t* value = mod->values.data[top];
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if (value->type->kind != TYPE_BOOL)
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{
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char msg[RZ_STR_LIMIT];
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snprintf(msg, RZ_STR_LIMIT,
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"type mismatch: BOOL expected, got %s.",
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TypeKindStr[value->type->kind] + strlen("TYPE_"));
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err_fatal(vm->err, msg, value->line);
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vm->pc++;
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break;
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}
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if (!value->value.bool)
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{
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fprintf(stderr, "\33[31mASSERT\33[0m[:%d] assertion failed\n",
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value->line);
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return -1;
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}
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vm->pc++;
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} break;
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default: {
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fprintf(stderr, "Cannot execute unknown opcode '%s'.\n",
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OpcodeStr[op]);
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abort();
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};
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}
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return 0;
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}
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