651 lines
18 KiB
C
651 lines
18 KiB
C
#include <common/fzl_builtins.h>
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#include <common/fzl_opcodes.h>
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#include <common/fzl_types.h>
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#include <common/fzl_value.h>
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#include <compiler/utils/fzl_const_pool.h>
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#include <stdbool.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <vm/fzl_vm.h>
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#include <vm/fzl_vm_env.h>
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#include <vm/fzl_vm_object.h>
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char last_err[256];
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static char *expect_hdr = "FZL\0\1";
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fzl_vm_t *fzl_mkvm(const char *filepath)
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{
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fzl_vm_t *vm = malloc(sizeof(fzl_vm_t));
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if (!vm)
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{
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snprintf(last_err, sizeof(last_err), "failed to allocate vm");
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return NULL;
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}
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vm->consts = NULL;
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vm->consts_count = 0;
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vm->ops = NULL;
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vm->ops_count = 0;
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vm->ip = 0;
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vm->dtop = 0;
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vm->ctop = 0;
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vm->etop = 0;
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vm->objects_count = 0;
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memset(vm->dstack, 0, sizeof(vm->dstack));
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memset(vm->cstack, 0, sizeof(vm->cstack));
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memset(vm->estack, 0, sizeof(vm->estack));
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memset(vm->objects, 0, sizeof(vm->objects));
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FILE *fd = fopen(filepath, "rb");
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if (!fd)
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{
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snprintf(last_err, sizeof(last_err), "failed to open file '%s'", filepath);
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return NULL;
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}
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char hdr[5];
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fread(hdr, sizeof(char), 5, fd);
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if (memcmp(hdr, expect_hdr, 5) != 0)
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{
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snprintf(last_err, sizeof(last_err), "magic check error");
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return NULL;
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}
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size_t consts_count, ops_count;
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fread(&consts_count, sizeof(size_t), 1, fd);
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fread(&ops_count, sizeof(size_t), 1, fd);
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if (ops_count < 1)
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{
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snprintf(last_err, sizeof(last_err), "there is nothing to do (0 ops)");
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return NULL;
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}
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if (consts_count > 0)
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{
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vm->consts_count = consts_count;
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vm->consts = malloc(consts_count * sizeof(fzl_value_t));
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for (size_t i = 0; i < consts_count; i++)
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{
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fzl_consttype_t type;
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fread(&type, sizeof(fzl_consttype_t), 1, fd);
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if (type == FZL_CONSTTYPE_STRING)
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{
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size_t length;
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char *chars;
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fread(&length, sizeof(size_t), 1, fd);
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chars = malloc(length * sizeof(char) + 1);
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fread(chars, sizeof(char), length, fd);
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chars[length] = 0;
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vm->consts[i] = (fzl_const_t){
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.type = type, .as.string.length = length, .as.string.chars = chars};
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}
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else
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{
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snprintf(last_err, sizeof(last_err), "unknown const type at index %ld",
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i);
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return NULL;
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}
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}
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}
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vm->ops_count = ops_count;
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vm->ops = malloc(ops_count * sizeof(uint64_t));
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for (size_t i = 0; i < ops_count; i++)
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{
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uint64_t op;
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fread(&op, sizeof(uint64_t), 1, fd);
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vm->ops[i] = op;
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}
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return vm;
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}
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int fzl_vm_run(fzl_vm_t *vm)
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{
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if (!vm)
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{
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snprintf(last_err, sizeof(last_err), "vm is null");
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return -1;
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}
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vm->ip = 0;
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while (vm->ip < vm->ops_count)
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{
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fzl_opcode_t opcode = vm->ops[vm->ip];
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switch (opcode)
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{
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case FZL_OPCODE_ALLOC_OBJECT:
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{
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uint64_t values_count = vm->ops[++vm->ip];
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fzl_vm_object_t *obj = malloc(sizeof(fzl_vm_object_t));
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obj->values = malloc(values_count * sizeof(fzl_value_t));
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obj->values_count = values_count;
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vm->objects[vm->objects_count++] = obj;
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vm->dstack[vm->dtop++] =
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(fzl_value_t){.type = FZL_TYPE_OBJECT, .as.obj = obj};
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break;
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}
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case FZL_OPCODE_GET_FIELD:
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{
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if (vm->dtop < 1)
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{
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snprintf(last_err, sizeof(last_err),
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"runtime error - expected value in data stack");
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return -1;
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}
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uint64_t field_slot = vm->ops[++vm->ip];
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fzl_value_t val = vm->dstack[--vm->dtop];
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if (val.type != FZL_TYPE_OBJECT)
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{
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snprintf(
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last_err, sizeof(last_err),
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"runtime error - cannot access field #%lu of non-object type",
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field_slot);
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return -1;
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}
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fzl_vm_object_t *obj = val.as.obj;
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if (obj->values_count <= field_slot)
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{
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snprintf(last_err, sizeof(last_err),
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"runtime error - cannot access field #%lu", field_slot);
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return -1;
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}
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vm->dstack[vm->dtop++] = obj->values[field_slot];
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break;
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}
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case FZL_OPCODE_SET_FIELD:
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{
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if (vm->dtop < 2)
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{
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snprintf(last_err, sizeof(last_err),
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"runtime error - expected two values in data stack");
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return -1;
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}
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uint64_t field_slot = vm->ops[++vm->ip];
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fzl_value_t objval = vm->dstack[--vm->dtop];
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fzl_value_t wrval = vm->dstack[--vm->dtop];
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if (objval.type != FZL_TYPE_OBJECT)
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{
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snprintf(
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last_err, sizeof(last_err),
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"runtime error - cannot access field #%lu of non-object type",
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field_slot);
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return -1;
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}
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fzl_vm_object_t *obj = objval.as.obj;
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if (obj->values_count <= field_slot)
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{
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snprintf(last_err, sizeof(last_err),
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"runtime error - cannot access field #%lu", field_slot);
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return -1;
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}
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obj->values[field_slot] = wrval;
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break;
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}
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case FZL_OPCODE_CALL:
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{
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uint64_t ip = vm->ops[++vm->ip];
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vm->cstack[vm->ctop++] = vm->ip;
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vm->ip = ip - 1;
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break;
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}
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case FZL_OPCODE_RET:
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{
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if (vm->ctop < 1)
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{
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snprintf(last_err, sizeof(last_err),
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"runtime error - no place to jump");
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return -1;
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}
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vm->ip = vm->cstack[--vm->ctop];
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break;
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}
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case FZL_OPCODE_CMP_EQ:
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if (vm->dtop < 2)
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{
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snprintf(last_err, sizeof(last_err),
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"runtime error - expected two values in data stack");
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return -1;
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}
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fzl_value_t req = vm->dstack[--vm->dtop];
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fzl_value_t leq = vm->dstack[--vm->dtop];
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vm->dstack[vm->dtop++] =
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(fzl_value_t){.type = FZL_TYPE_BOOL, .as.b = leq.as.u == req.as.u};
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break;
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case FZL_OPCODE_CMP_NEQ:
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if (vm->dtop < 2)
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{
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snprintf(last_err, sizeof(last_err),
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"runtime error - expected two values in data stack");
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return -1;
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}
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fzl_value_t rneq = vm->dstack[--vm->dtop];
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fzl_value_t lneq = vm->dstack[--vm->dtop];
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vm->dstack[vm->dtop++] = (fzl_value_t){.type = FZL_TYPE_BOOL,
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.as.b = lneq.as.u != rneq.as.u};
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break;
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case FZL_OPCODE_CMP_LT:
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if (vm->dtop < 2)
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{
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snprintf(last_err, sizeof(last_err),
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"runtime error - expected two values in data stack");
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return -1;
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}
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fzl_value_t rlt = vm->dstack[--vm->dtop];
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fzl_value_t llt = vm->dstack[--vm->dtop];
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vm->dstack[vm->dtop++] =
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(fzl_value_t){.type = FZL_TYPE_BOOL, .as.b = llt.as.u < rlt.as.u};
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break;
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case FZL_OPCODE_CMP_LTEQ:
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if (vm->dtop < 2)
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{
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snprintf(last_err, sizeof(last_err),
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"runtime error - expected two values in data stack");
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return -1;
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}
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fzl_value_t rlteq = vm->dstack[--vm->dtop];
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fzl_value_t llteq = vm->dstack[--vm->dtop];
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vm->dstack[vm->dtop++] = (fzl_value_t){
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.type = FZL_TYPE_BOOL, .as.b = llteq.as.u <= rlteq.as.u};
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break;
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case FZL_OPCODE_CMP_GT:
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if (vm->dtop < 2)
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{
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snprintf(last_err, sizeof(last_err),
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"runtime error - expected two values in data stack");
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return -1;
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}
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fzl_value_t rgt = vm->dstack[--vm->dtop];
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fzl_value_t lgt = vm->dstack[--vm->dtop];
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vm->dstack[vm->dtop++] =
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(fzl_value_t){.type = FZL_TYPE_BOOL, .as.b = lgt.as.u > rgt.as.u};
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break;
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case FZL_OPCODE_CMP_GTEQ:
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if (vm->dtop < 2)
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{
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snprintf(last_err, sizeof(last_err),
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"runtime error - expected two values in data stack");
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return -1;
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}
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fzl_value_t rgteq = vm->dstack[--vm->dtop];
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fzl_value_t lgteq = vm->dstack[--vm->dtop];
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vm->dstack[vm->dtop++] = (fzl_value_t){
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.type = FZL_TYPE_BOOL, .as.b = lgteq.as.u >= rgteq.as.u};
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break;
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case FZL_OPCODE_NOT:
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if (vm->dtop < 1)
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{
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snprintf(last_err, sizeof(last_err),
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"runtime error - expected value in data stack");
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return -1;
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}
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fzl_value_t notval = vm->dstack[--vm->dtop];
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vm->dstack[vm->dtop++] =
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(fzl_value_t){.type = FZL_TYPE_BOOL, .as.b = !notval.as.b};
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break;
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case FZL_OPCODE_JZ:
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if (vm->dtop < 1)
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{
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snprintf(last_err, sizeof(last_err),
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"runtime error - expected value in data stack");
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return -1;
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}
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fzl_value_t jzval = vm->dstack[--vm->dtop];
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uint64_t jzip = vm->ops[++vm->ip] - 1;
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if (jzval.as.b == 0)
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vm->ip = jzip;
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break;
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case FZL_OPCODE_JMP:
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vm->ip = vm->ops[++vm->ip] - 1;
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break;
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case FZL_OPCODE_AND:
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if (vm->dtop < 2)
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{
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snprintf(last_err, sizeof(last_err),
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"runtime error - expected two values in data stack");
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return -1;
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}
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fzl_value_t land = vm->dstack[--vm->dtop];
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fzl_value_t rand = vm->dstack[--vm->dtop];
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vm->dstack[vm->dtop++] = (fzl_value_t){.type = FZL_TYPE_BOOL,
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.as.b = land.as.b && rand.as.b};
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break;
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case FZL_OPCODE_OR:
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if (vm->dtop < 2)
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{
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snprintf(last_err, sizeof(last_err),
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"runtime error - expected two values in data stack");
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return -1;
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}
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fzl_value_t lor = vm->dstack[--vm->dtop];
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fzl_value_t ror = vm->dstack[--vm->dtop];
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vm->dstack[vm->dtop++] =
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(fzl_value_t){.type = FZL_TYPE_BOOL, .as.b = lor.as.b || ror.as.b};
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break;
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case FZL_OPCODE_STORE:
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if (vm->dtop < 1)
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{
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snprintf(last_err, sizeof(last_err),
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"runtime error - expected var name in data stack");
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return -1;
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}
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fzl_value_t varname = vm->dstack[--vm->dtop];
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fzl_env_storevalue(vm->estack[vm->etop - 1], (char *)varname.as.s.value,
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(fzl_value_t){});
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break;
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case FZL_OPCODE_WRITE:
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if (vm->dtop < 2)
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{
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snprintf(last_err, sizeof(last_err),
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"runtime error - expected 2 values in data stack");
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return -1;
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}
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fzl_value_t writevar = vm->dstack[--vm->dtop];
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fzl_value_t value = vm->dstack[--vm->dtop];
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fzl_vm_env_wresult_t wresult = fzl_env_writevalue(
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vm->estack[vm->etop - 1], (char *)writevar.as.s.value, value);
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if (wresult != FZL_VM_ENV_WRESULT_OK)
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{
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switch (wresult)
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{
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case FZL_VM_ENV_WRESULT_ERR:
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snprintf(last_err, sizeof(last_err),
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"runtime error - failed to write variable");
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return -1;
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case FZL_VM_ENV_WRESULT_ERR_EXISTS:
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snprintf(last_err, sizeof(last_err),
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"runtime error - redefenition of '%s'",
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writevar.as.s.value);
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return -1;
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case FZL_VM_ENV_WRESULT_ERR_NOT_FOUND:
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snprintf(last_err, sizeof(last_err),
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"runtime error - cannot find name '%s'",
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writevar.as.s.value);
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return -1;
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default:
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return -1;
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}
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}
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// vm->dstack[vm->dtop++] = value;
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// NOTE: add POP opcode to prevent
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// stack overflow!
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break;
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case FZL_OPCODE_MK_ENVTABLE:
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vm->estack[vm->etop++] = fzl_mkenv();
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break;
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case FZL_OPCODE_RM_ENVTABLE:
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fzl_freeenv(vm->estack[--vm->etop]);
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break;
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case FZL_OPCODE_LOOKUP_ENV:
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{
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if (vm->dtop < 1)
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{
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snprintf(last_err, sizeof(last_err),
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"runtime error - LOOKUP_ENV: empty data stack");
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return -1;
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}
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fzl_value_t val = vm->dstack[--vm->dtop];
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fzl_value_t env_val;
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bool result;
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for (ssize_t i = vm->etop - 1; i >= 0; i--)
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{
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if ((result = fzl_env_lookup(vm->estack[i], (char *)val.as.s.value,
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&env_val)))
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break;
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}
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vm->dstack[vm->dtop++] = env_val;
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break;
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}
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case FZL_OPCODE_CALL_BUILTIN:
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{
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uint64_t fn_id = vm->ops[++vm->ip];
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if (fn_id == FZL_BUILTIN_PRINTLINE)
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{
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fzl_value_t arg = vm->dstack[--vm->dtop];
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if (arg.type == FZL_TYPE_STRING)
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printf("%s\n", arg.as.s.value);
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else if (arg.type == FZL_TYPE_CHAR)
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printf("%c\n", arg.as.c);
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else if (arg.type == FZL_TYPE_INT)
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printf("%ld\n", arg.as.i);
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else if (arg.type == FZL_TYPE_UINT)
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printf("%lu\n", arg.as.u);
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else if (arg.type == FZL_TYPE_BOOL)
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printf("%b\n", arg.as.b);
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else if (arg.type == FZL_TYPE_NULL)
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printf("<null>\n");
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}
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else
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{
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snprintf(last_err, sizeof(last_err),
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"runtime error - undefined builtin %lu", fn_id);
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return -1;
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}
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}
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break;
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case FZL_OPCODE_LOADCONST:
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{
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uint64_t cn = vm->ops[++vm->ip];
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if (vm->consts_count <= cn)
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{
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snprintf(last_err, sizeof(last_err), "runtime error - unknown const");
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return -1;
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}
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fzl_const_t c = vm->consts[cn];
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vm->dstack[vm->dtop++] =
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(fzl_value_t){.type = FZL_TYPE_STRING,
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.as.s.length = c.as.string.length,
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.as.s.value = c.as.string.chars};
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}
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break;
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case FZL_OPCODE_ADD:
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if (vm->dtop < 2)
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{
|
|
snprintf(last_err, sizeof(last_err),
|
|
"runtime error - expected 2 values in stack");
|
|
return -1;
|
|
}
|
|
fzl_value_t add1 = vm->dstack[--vm->dtop];
|
|
fzl_value_t add2 = vm->dstack[--vm->dtop];
|
|
vm->dstack[vm->dtop++] =
|
|
(fzl_value_t){.type = add1.type, .as.u = add1.as.u + add2.as.u};
|
|
break;
|
|
|
|
case FZL_OPCODE_SUB:
|
|
if (vm->dtop < 2)
|
|
{
|
|
snprintf(last_err, sizeof(last_err),
|
|
"runtime error - expected 2 values in stack");
|
|
return -1;
|
|
}
|
|
fzl_value_t sub2 = vm->dstack[--vm->dtop];
|
|
fzl_value_t sub1 = vm->dstack[--vm->dtop];
|
|
vm->dstack[vm->dtop++] =
|
|
(fzl_value_t){.type = sub1.type, .as.u = sub1.as.u - sub2.as.u};
|
|
break;
|
|
|
|
case FZL_OPCODE_MUL:
|
|
if (vm->dtop < 2)
|
|
{
|
|
snprintf(last_err, sizeof(last_err),
|
|
"runtime error - expected 2 values in stack");
|
|
return -1;
|
|
}
|
|
fzl_value_t mul1 = vm->dstack[--vm->dtop];
|
|
fzl_value_t mul2 = vm->dstack[--vm->dtop];
|
|
vm->dstack[vm->dtop++] =
|
|
(fzl_value_t){.type = mul1.type, .as.u = mul1.as.u * mul2.as.u};
|
|
break;
|
|
|
|
case FZL_OPCODE_DIV:
|
|
if (vm->dtop < 2)
|
|
{
|
|
snprintf(last_err, sizeof(last_err),
|
|
"runtime error - expected 2 values in stack");
|
|
return -1;
|
|
}
|
|
fzl_value_t div1 = vm->dstack[--vm->dtop];
|
|
fzl_value_t div2 = vm->dstack[--vm->dtop];
|
|
vm->dstack[vm->dtop++] =
|
|
(fzl_value_t){.type = div1.type, .as.u = div2.as.u / div1.as.u};
|
|
break;
|
|
|
|
case FZL_OPCODE_POW:
|
|
if (vm->dtop < 2)
|
|
{
|
|
snprintf(last_err, sizeof(last_err),
|
|
"runtime error - expected 2 values in stack");
|
|
return -1;
|
|
}
|
|
fzl_value_t pow2 = vm->dstack[--vm->dtop];
|
|
fzl_value_t pow1 = vm->dstack[--vm->dtop];
|
|
|
|
uint64_t pow_n = pow1.as.u;
|
|
uint64_t pow_res = pow_n;
|
|
uint64_t pow_times = pow2.as.u;
|
|
for (size_t i = 1; i < pow_times; i++)
|
|
pow_res *= pow_n;
|
|
|
|
vm->dstack[vm->dtop++] =
|
|
(fzl_value_t){.type = pow1.type, .as.u = pow_res};
|
|
break;
|
|
|
|
case FZL_OPCODE_MOD:
|
|
if (vm->dtop < 2)
|
|
{
|
|
snprintf(last_err, sizeof(last_err),
|
|
"runtime error - expected 2 values in stack");
|
|
return -1;
|
|
}
|
|
fzl_value_t mod1 = vm->dstack[--vm->dtop];
|
|
fzl_value_t mod2 = vm->dstack[--vm->dtop];
|
|
vm->dstack[vm->dtop++] =
|
|
(fzl_value_t){.type = mod1.type, .as.u = mod2.as.u % mod1.as.u};
|
|
break;
|
|
|
|
case FZL_OPCODE_NEG:
|
|
if (vm->dtop < 1)
|
|
{
|
|
snprintf(last_err, sizeof(last_err),
|
|
"runtime error - expected value in stack");
|
|
return -1;
|
|
}
|
|
fzl_value_t neg_n = vm->dstack[--vm->dtop];
|
|
vm->dstack[vm->dtop++] =
|
|
(fzl_value_t){.type = neg_n.type, .as.u = -neg_n.as.u};
|
|
break;
|
|
|
|
case FZL_OPCODE_PUSHNUM:
|
|
{
|
|
uint64_t push_n = vm->ops[++vm->ip];
|
|
vm->dstack[vm->dtop++] =
|
|
(fzl_value_t){.type = FZL_TYPE_UINT, .as.u = push_n};
|
|
break;
|
|
}
|
|
|
|
case FZL_OPCODE_PUSHBOOL:
|
|
{
|
|
uint64_t push_b = vm->ops[++vm->ip];
|
|
vm->dstack[vm->dtop++] =
|
|
(fzl_value_t){.type = FZL_TYPE_BOOL, .as.b = push_b};
|
|
break;
|
|
}
|
|
|
|
default:
|
|
snprintf(last_err, sizeof(last_err),
|
|
"runtime error - unknown opcode %u", opcode);
|
|
return -1;
|
|
}
|
|
|
|
vm->ip++;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
char *fzl_vm_geterror() { return last_err; }
|
|
|
|
void fzl_freevm(fzl_vm_t *vm)
|
|
{
|
|
if (!vm)
|
|
return;
|
|
|
|
for (size_t i = 0; i < vm->consts_count; i++)
|
|
{
|
|
if (vm->consts[i].type == FZL_CONSTTYPE_STRING)
|
|
free((void *)vm->consts[i].as.string.chars);
|
|
}
|
|
|
|
for (size_t i = 0; i < vm->objects_count; i++)
|
|
{
|
|
free(vm->objects[i]->values);
|
|
free(vm->objects[i]);
|
|
}
|
|
|
|
free(vm->consts);
|
|
free(vm->ops);
|
|
free(vm);
|
|
}
|