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#include "val.h"
#include <stdio.h>
#include <string.h>
#include "dyn_arr.h"
#include "vm.h"
#define STR_NUM_FMT "%g"
#define STR_FUNC_FMT "<func %s: %p>"
static
void init_obj(struct us_val val, struct us_obj *obj)
{
(void)obj; // nothing to init yet
da_append(struct us_val, &vm.objs, val);
}
struct us_str *take_str(char *chars, int len)
{
if (len < 0)
len = strlen(chars);
struct us_str *str = mem_alloc(sizeof(struct us_str));
str->chars = chars;
str->len = len;
init_obj(wrap_str(str), &str->header);
return str;
}
struct us_str *copy_str(const char *chars, int len)
{
if (len < 0)
len = strlen(chars);
char *copy = mem_alloc(len + 1);
memcpy(copy, chars, len);
copy[len] = '\0';
return take_str(copy, len);
}
struct us_proto *create_proto(struct us_str *name)
{
struct us_proto *proto = mem_alloc(sizeof(struct us_proto));
proto->name = name;
proto->bytecode = da_create(u8, 0);
proto->upvalc = 0;
proto->argc = 0;
proto->is_variadic = false;
proto->nconstants = 0;
init_obj(wrap_proto(proto), &proto->header);
return proto;
}
struct us_func *create_func(struct us_proto *proto)
{
struct us_func *func = mem_alloc(sizeof(struct us_func));
func->proto = proto;
func->upvals = mem_alloc(sizeof(struct us_upval*) * proto->upvalc);
init_obj(wrap_func(func), &func->header);
return func;
}
struct us_upval *create_upval(struct us_val *val)
{
struct us_upval *upval = mem_alloc(sizeof(struct us_upval));
upval->loc = val;
upval->closed = create_zilch();
upval->next = NULL;
init_obj(wrap_upval(upval), &upval->header);
return upval;
}
void free_val(struct us_val v)
{
switch (v.type) {
case VAL_STR: {
struct us_str *str = get_str(v);
mem_free(str->chars);
mem_free(str);
break;
}
case VAL_PROTO: {
struct us_proto *proto = get_proto(v);
da_free(proto->bytecode);
mem_free(proto->upval_locs);
mem_free(proto);
break;
}
case VAL_FUNC: {
struct us_func *func = get_func(v);
mem_free(func->upvals);
mem_free(func);
break;
}
case VAL_UPVAL:
mem_free(get_obj(v));
break;
case VAL_NUM:
case VAL_BOOL:
case VAL_ZILCH:
break;
}
}
void proto_add_const(struct us_proto *proto, struct us_val v)
{
proto->constants[proto->nconstants] = v;
proto_add_byte(proto, BC_LOAD);
proto_add_byte(proto, proto->nconstants++);
}
bool vals_eql(struct us_val a, struct us_val b)
{
if (a.type != b.type)
return false;
switch (a.type) {
case VAL_NUM: return get_num(a) == get_num(b);
case VAL_BOOL: return get_bool(a) == get_bool(b);
case VAL_ZILCH: return true;
case VAL_STR: {
struct us_str *a_str = get_str(a);
struct us_str *b_str = get_str(b);
return a_str->len == b_str->len &&
memcmp(a_str->chars, b_str->chars, a_str->len) == 0;
}
case VAL_FUNC:
case VAL_UPVAL:
case VAL_PROTO: return get_obj(a) == get_obj(b);
}
// unreachable
return false;
}
char *val_to_str(struct us_val v, int *len_out)
{
// TODO: have this function return a us_str so that we own the memory,
// and so concatenation of strings is faster.
switch (v.type) {
case VAL_NUM: {
int len = snprintf(NULL, 0, STR_NUM_FMT, get_num(v));
char *str = mem_alloc(sizeof(char) * (len + 1));
snprintf(str, len + 1, STR_NUM_FMT, get_num(v));
if (len_out)
*len_out = len;
return str;
}
case VAL_BOOL: {
const char *bool_str = get_bool(v) ? "true" : "false";
char *str = mem_alloc(strlen(bool_str) + 1);
strcpy(str, bool_str);
if (len_out)
*len_out = strlen(bool_str);
return str;
}
case VAL_ZILCH: {
const char *zilch_str = "zilch";
char *str = mem_alloc(strlen(zilch_str) + 1);
strcpy(str, zilch_str);
if (len_out)
*len_out = strlen(zilch_str);
return str;
}
case VAL_STR: {
const struct us_str *us_str = get_str(v);
char *str = mem_alloc(sizeof(char) * us_str->len + 1);
strncpy(str, us_str->chars, us_str->len);
str[us_str->len] = 0;
if (len_out)
*len_out = us_str->len;
return str;
}
case VAL_PROTO: {
const struct us_proto *proto = get_proto(v);
int len = snprintf(
NULL,
0,
STR_FUNC_FMT,
proto->name->chars,
(void*)proto
);
char *str = mem_alloc(sizeof(char) * (len + 1));
snprintf(
str,
len + 1,
STR_FUNC_FMT,
proto->name->chars,
(void*)proto
);
if (len_out)
*len_out = len;
return str;
}
case VAL_FUNC:
return val_to_str(wrap_proto(get_func(v)->proto), len_out);
case VAL_UPVAL:
return val_to_str(*get_upval(v)->loc, len_out);
}
// unreachable
return NULL;
}
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