71 lines
1.1 KiB
C
71 lines
1.1 KiB
C
#include "vm.h"
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#include "lib/commons.h"
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void vm_init(vm_t* vm)
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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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}
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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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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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void 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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vm_exec_instr(vm, mod->program.ops[vm->pc],
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mod->program.params[vm->pc]);
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}
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}
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void vm_exec_instr(vm_t* vm, 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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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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}
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