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value.c
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value.c
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#include <assert.h>
#include <inttypes.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "agent.h"
#include "alloc.h"
#include "bytes.h"
#include "cb_util.h"
#include "cbcvm.h"
#include "eval.h"
#include "module.h"
#include "str.h"
#include "struct.h"
#include "value.h"
static void cb_function_deinit(void *ptr)
{
struct cb_user_function ufn;
struct cb_function *fn = ptr;
if (fn->type != CB_FUNCTION_USER)
return;
ufn = fn->value.as_user;
if (ufn.upvalues_len) {
for (unsigned i = 0; i < ufn.upvalues_len; i += 1) {
if (ufn.upvalues[i]->refcount != 0)
ufn.upvalues[i]->refcount -= 1;
if (ufn.upvalues[i]->refcount == 0)
free(ufn.upvalues[i]);
if (cb_vm_state.upvalues != NULL) {
for (unsigned j = 0;
j < cb_vm_state.upvalues_idx;
j += 1) {
if (cb_vm_state.upvalues[j]
== ufn.upvalues[i]) {
cb_vm_state.upvalues[j] = NULL;
break;
}
}
}
}
free(ufn.upvalues);
}
}
inline struct cb_function *cb_function_new(void)
{
return cb_malloc(sizeof(struct cb_function), cb_function_deinit);
}
struct cb_value cb_cfunc_new(size_t name, size_t arity,
cb_native_function *fn)
{
struct cb_function *func;
struct cb_value func_val;
func = cb_function_new();
func->arity = arity;
func->name = name;
func->type = CB_FUNCTION_NATIVE;
func->value.as_native = fn;
func_val.type = CB_VALUE_FUNCTION;
func_val.val.as_function = func;
return func_val;
}
CB_INLINE size_t cb_ufunc_entry(const struct cb_function *func, size_t num_args)
{
const struct cb_user_function *ufunc;
assert(func->type == CB_FUNCTION_USER);
ufunc = &func->value.as_user;
if (num_args >= func->arity + ufunc->optargs.count)
return ufunc->address;
return ufunc->optargs.addrs[num_args - func->arity];
}
inline struct cb_array *cb_array_new(size_t len)
{
struct cb_array *mem = cb_malloc(sizeof(struct cb_array)
+ sizeof(struct cb_value) * len, NULL);
mem->len = len;
return mem;
}
static void deinit_string(void *s_ptr)
{
struct cb_string *s = s_ptr;
cb_str_free(s->string);
}
inline struct cb_string *cb_string_new(void)
{
return cb_malloc(sizeof(struct cb_string), deinit_string);
}
int cb_value_is_truthy(struct cb_value *val)
{
switch (val->type) {
case CB_VALUE_INT:
return val->val.as_int != 0;
case CB_VALUE_DOUBLE:
return val->val.as_double != 0;
case CB_VALUE_BOOL:
return val->val.as_bool;
case CB_VALUE_CHAR:
return 1;
case CB_VALUE_STRING:
return cb_strlen(val->val.as_string->string) > 0;
case CB_VALUE_BYTES:
return cb_bytes_len(val->val.as_bytes) > 0;
case CB_VALUE_INTERNED_STRING: {
cb_str s = cb_agent_get_string(val->val.as_interned_string);
return cb_strlen(s) > 0;
}
case CB_VALUE_ARRAY:
return val->val.as_array->len > 0;
case CB_VALUE_FUNCTION:
return 1;
case CB_VALUE_NULL:
return 0;
case CB_VALUE_STRUCT:
case CB_VALUE_STRUCT_SPEC:
return 1;
case CB_VALUE_USERDATA:
return 1;
}
return 0;
}
const char *cb_value_type_name(enum cb_value_type type)
{
switch (type) {
#define CASE(T) case T: return #T;
CB_VALUE_TYPE_LIST(CASE)
#undef CASE
default:
return "";
}
}
/* See Py_ReprEnter in cpython/Objects/object.c for the inspiration of this */
static struct repr_stack {
struct repr_stack *next;
cb_gc_header *obj;
} *repr_stack = NULL;
int repr_enter(cb_gc_header *obj)
{
struct repr_stack *tmp;
for (tmp = repr_stack; tmp; tmp = tmp->next) {
if (tmp->obj == obj)
return 1;
}
tmp = malloc(sizeof(struct repr_stack));
tmp->next = repr_stack;
tmp->obj = obj;
repr_stack = tmp;
return 0;
}
void repr_leave(cb_gc_header *obj)
{
struct repr_stack *tmp, **prev;
for (prev = &repr_stack, tmp = repr_stack;
tmp && tmp->obj != obj;
prev = &tmp->next, tmp = tmp->next);
if (tmp != NULL) {
*prev = tmp->next;
free(tmp);
}
}
cb_str cb_value_to_string(struct cb_value *val)
{
size_t len;
cb_str buf;
switch (val->type) {
case CB_VALUE_INT:
len = snprintf(NULL, 0, "%" PRIdPTR, val->val.as_int);
cb_str_init(&buf, len);
snprintf(cb_strptr(&buf), len + 1, "%" PRIdPTR, val->val.as_int);
break;
case CB_VALUE_DOUBLE:
len = snprintf(NULL, 0, "%g", val->val.as_double);
cb_str_init(&buf, len);
snprintf(cb_strptr(&buf), len + 1, "%g", val->val.as_double);
break;
case CB_VALUE_BOOL:
if (val->val.as_bool) {
len = sizeof("true") - 1;
cb_str_init(&buf, len);
sprintf(cb_strptr(&buf), "true");
} else {
len = sizeof("false") - 1;
cb_str_init(&buf, len);
sprintf(cb_strptr(&buf), "false");
}
break;
case CB_VALUE_NULL:
len = 4;
cb_str_init(&buf, len);
sprintf(cb_strptr(&buf), "null");
break;
case CB_VALUE_CHAR:
cb_str_init(&buf, 1);
/* FIXME: unicode */
cb_strptr(&buf)[0] = val->val.as_char & 0xFF;
cb_strptr(&buf)[1] = 0;
break;
case CB_VALUE_STRING:
buf = cb_strdup(val->val.as_string->string);
break;
case CB_VALUE_BYTES: {
char *ptr;
size_t i, blen;
struct cb_bytes *bs = val->val.as_bytes;
blen = cb_bytes_len(bs);
/* room for "<<>>" plus comma-space between each elem */
len = 4 + (blen - 1) * 2;
for (i = 0; i < blen; i += 1)
len += snprintf(NULL, 0, "%d", cb_bytes_get(bs, i));
cb_str_init(&buf, len);
ptr = cb_strptr(&buf);
*ptr++ = '<';
*ptr++ = '<';
for (i = 0; i < blen; i += 1) {
ptr += sprintf(ptr, "%d", cb_bytes_get(bs, i));
if (i + 1 < blen) {
*ptr++ = ',';
*ptr++ = ' ';
}
}
*ptr++ = '>';
*ptr++ = '>';
break;
}
case CB_VALUE_INTERNED_STRING:
buf = cb_strdup(cb_agent_get_string(
val->val.as_interned_string));
break;
case CB_VALUE_FUNCTION: {
const struct cb_function *func = val->val.as_function;
size_t name = func->name;
cb_str s, modname;
cb_str_init(&modname, 0);
s = cb_agent_get_string(name);
len = cb_strlen(s);
len += sizeof("<function >"); /* includes NUL byte */
/* User functions show the module name too */
if (func->type == CB_FUNCTION_USER) {
const struct cb_module *mod;
const struct cb_user_function *ufunc;
ufunc = &func->value.as_user;
mod = &cb_vm_state.modules[ufunc->module_id];
modname = cb_agent_get_string(
cb_modspec_name(mod->spec));
/* modname + '.' */
len += 1 + cb_strlen(modname);
}
cb_str_init(&buf, len);
sprintf(cb_strptr(&buf), "<function ");
size_t pos = sizeof("<function ") - 1;
if (cb_strlen(modname)) {
memcpy(cb_strptr(&buf) + pos,
cb_strptr(&modname),
cb_strlen(modname));
pos += cb_strlen(modname);
cb_strptr(&buf)[pos] = '.';
pos += 1;
}
memcpy(cb_strptr(&buf) + pos, cb_strptr(&s),
cb_strlen(s));
cb_strptr(&buf)[len - 2] = '>';
cb_strptr(&buf)[len - 1] = 0;
break;
}
case CB_VALUE_ARRAY: {
char *ptr;
size_t array_len = val->val.as_array->len;
cb_str elements[array_len];
if (repr_enter(&val->val.as_array->gc_header)) {
len = sizeof("[...]") - 1;
cb_str_init(&buf, len);
memcpy(cb_strptr(&buf), "[...]", len);
break;
}
len = 2; /* square brackets around elements */
for (unsigned i = 0; i < array_len; i += 1) {
elements[i] = cb_value_to_string(
&val->val.as_array->values[i]);
len += cb_strlen(elements[i]);
if (i != 0)
len += 2; /* comma space */
}
cb_str_init(&buf, len);
ptr = cb_strptr(&buf);
*ptr++ = '[';
for (unsigned i = 0; i < array_len; i += 1) {
memcpy(ptr, cb_strptr(&elements[i]),
cb_strlen(elements[i]));
cb_str_free(elements[i]);
ptr += cb_strlen(elements[i]);
if (i + 1 < array_len) {
*ptr++ = ',';
*ptr++ = ' ';
}
}
*ptr++ = ']';
assert(ptr == cb_strptr(&buf) + len);
repr_leave(&val->val.as_array->gc_header);
break;
}
case CB_VALUE_STRUCT: {
char *ptr;
struct cb_struct *s = val->val.as_struct;
size_t struct_len = s->spec->nfields;
cb_str elements[struct_len];
const char *name;
size_t name_len;
cb_str n = cb_agent_get_string(s->spec->name);
name = cb_strptr(&n);
name_len = cb_strlen(n);
len = name_len + 2;
if (repr_enter(&val->val.as_struct->gc_header)) {
len += 3; /* for "..." */
cb_str_init(&buf, len);
ptr = cb_strptr(&buf);
memcpy(ptr, name, name_len);
memcpy(ptr + name_len, "{...}", 5);
break;
}
for (unsigned i = 0; i < struct_len; i += 1) {
elements[i] = cb_value_to_string(&s->fields[i]);
len += cb_strlen(elements[i]);
len += cb_strlen(cb_agent_get_string(
s->spec->fields[i]));
len += 3; /* space equal space */
if (i != 0)
len += 2;
}
cb_str_init(&buf, len);
ptr = cb_strptr(&buf);
memcpy(ptr, name, name_len);
ptr += name_len;
*ptr++ = '{';
for (unsigned i = 0; i < struct_len; i += 1) {
cb_str fname = cb_agent_get_string(
s->spec->fields[i]);
memcpy(ptr, cb_strptr(&fname), cb_strlen(fname));
ptr += cb_strlen(fname);
memcpy(ptr, " = ", 3);
ptr += 3;
memcpy(ptr, cb_strptr(&elements[i]),
cb_strlen(elements[i]));
cb_str_free(elements[i]);
ptr += cb_strlen(elements[i]);
if (i + 1 < struct_len) {
*ptr++ = ',';
*ptr++ = ' ';
}
}
*ptr++ = '}';
assert(ptr == cb_strptr(&buf) + len);
repr_leave(&val->val.as_struct->gc_header);
break;
}
case CB_VALUE_STRUCT_SPEC: {
size_t name_id = val->val.as_struct_spec->name;
char *ptr;
const char *name;
size_t name_len;
cb_str n = cb_agent_get_string(name_id);
name = cb_strptr(&n);
name_len = cb_strlen(n);
len = name_len + sizeof("<struct >") - 1;
cb_str_init(&buf, len);
ptr = cb_strptr(&buf);
memcpy(ptr, "<struct ", 8);
ptr += 8;
memcpy(ptr, name, name_len);
ptr += name_len;
*ptr++ = '>';
assert(ptr == cb_strptr(&buf) + len);
break;
}
case CB_VALUE_USERDATA: {
size_t size = sizeof("<userdata>") - 1;
cb_str_init(&buf, size);
memcpy(cb_strptr(&buf), "<userdata>", size);
break;
}
default:
fprintf(stderr, "unsupported to_string (%s)\n",
cb_value_type_friendly_name(val->type));
abort();
break;
}
return buf;
}
int cb_value_eq(struct cb_value *a, struct cb_value *b)
{
if (a == b)
return 1;
if (a->type == CB_VALUE_INTERNED_STRING && b->type == CB_VALUE_STRING) {
cb_str str = cb_agent_get_string(a->val.as_interned_string);
return !strcmp(cb_strptr(&b->val.as_string->string),
cb_strptr(&str));
} else if (b->type == CB_VALUE_INTERNED_STRING
&& a->type == CB_VALUE_STRING) {
cb_str str = cb_agent_get_string(b->val.as_interned_string);
return !strcmp(cb_strptr(&a->val.as_string->string),
cb_strptr(&str));
}
if (a->type != b->type)
return 0;
switch (a->type) {
case CB_VALUE_INT:
return a->val.as_int == b->val.as_int;
case CB_VALUE_DOUBLE:
return a->val.as_double == b->val.as_double;
case CB_VALUE_BOOL:
return a->val.as_bool == b->val.as_bool;
case CB_VALUE_CHAR:
return a->val.as_char == b->val.as_char;
case CB_VALUE_STRUCT_SPEC:
return a->val.as_struct_spec == b->val.as_struct_spec;
case CB_VALUE_NULL:
return 1;
case CB_VALUE_ARRAY: {
if (a->val.as_array->len != b->val.as_array->len)
return 0;
struct cb_array *left, *right;
left = a->val.as_array;
right = b->val.as_array;
for (unsigned i = 0; i < left->len; i += 1) {
if (!cb_value_eq(&left->values[i], &right->values[i]))
return 0;
}
return 1;
}
case CB_VALUE_STRING:
return !strcmp(cb_strptr(&a->val.as_string->string),
cb_strptr(&b->val.as_string->string));
case CB_VALUE_BYTES: {
struct cb_bytes *bytes_a, *bytes_b;
bytes_a = a->val.as_bytes;
bytes_b = b->val.as_bytes;
return 0 == cb_bytes_cmp(bytes_a, bytes_b);
}
case CB_VALUE_FUNCTION:
if (a->val.as_function->type != b->val.as_function->type)
return 0;
if (a->val.as_function->type == CB_FUNCTION_USER)
return a->val.as_function->value.as_user.address
== b->val.as_function->value.as_user.address;
return a->val.as_function->value.as_native
== b->val.as_function->value.as_native;
case CB_VALUE_INTERNED_STRING:
return a->val.as_interned_string == b->val.as_interned_string;
case CB_VALUE_STRUCT: {
if (a->val.as_struct->spec != b->val.as_struct->spec)
return 0;
struct cb_struct *left, *right;
left = a->val.as_struct;
right = b->val.as_struct;
for (unsigned i = 0; i < left->spec->nfields; i += 1) {
if (!cb_value_eq(&left->fields[i], &right->fields[i]))
return 0;
}
return 1;
}
case CB_VALUE_USERDATA:
return a->val.as_userdata == b->val.as_userdata;
default:
return 0;
}
}
/* There is only a partial ordering defined for values. If ok is set to true
* when this function returns, it means the result is the actual ordering
* between the values `a` and `b`. Otherwise, the return value will be 0.
*
* `ok` can be NULL for convenience. If two values are not comparable, the
* result will be 0 (i.e. neutral).
*
* If the result is negative, `a` is less than `b`. If the value is positive,
* the reverse is true. Otherwise, if the result is zero, the values are equal
* (or the ordering is undefined).
*/
double cb_value_cmp(struct cb_value *a, struct cb_value *b, int *ok)
{
#define UNDEFINED() ({ \
if (ok != NULL) \
*ok = 0; \
0; \
})
#define OK(VAL) ({ \
if (ok != NULL) \
*ok = 1; \
(VAL); \
})
if (cb_value_eq(a, b))
return OK(0);
switch (a->type) {
case CB_VALUE_INT:
if (b->type == CB_VALUE_INT)
return OK(a->val.as_int - b->val.as_int);
if (b->type == CB_VALUE_DOUBLE)
return OK(((double) a->val.as_int) - b->val.as_double);
return UNDEFINED();
case CB_VALUE_DOUBLE:
if (b->type == CB_VALUE_INT)
return OK(a->val.as_double - (double) b->val.as_int);
if (b->type == CB_VALUE_DOUBLE)
return OK(a->val.as_double - b->val.as_double);
return UNDEFINED();
default:
return UNDEFINED();
}
#undef UNDEFINED
#undef OK
}
void cb_function_add_upvalue(struct cb_user_function *fn, struct cb_upvalue *uv)
{
if (fn->upvalues_len >= fn->upvalues_size) {
/* FIXME: this could probably be pre-allocated; we know how many
* upvalues a function has when compiling, so the information
* just needs to be passed through the bytecode */
if (fn->upvalues_size == 0)
fn->upvalues_size = 4;
else
fn->upvalues_size <<= 1;
fn->upvalues = realloc(fn->upvalues,
fn->upvalues_size * sizeof(struct cb_upvalue *));
}
uv->refcount += 1;
fn->upvalues[fn->upvalues_len++] = uv;
}
const char *cb_value_type_friendly_name(enum cb_value_type typ)
{
switch (typ) {
case CB_VALUE_INT:
return "integer";
case CB_VALUE_DOUBLE:
return "double";
case CB_VALUE_BOOL:
return "boolean";
case CB_VALUE_NULL:
return "null";
case CB_VALUE_STRING:
case CB_VALUE_INTERNED_STRING:
return "string";
case CB_VALUE_BYTES:
return "bytes";
case CB_VALUE_CHAR:
return "char";
case CB_VALUE_ARRAY:
return "array";
case CB_VALUE_FUNCTION:
return "function";
case CB_VALUE_STRUCT:
return "struct";
case CB_VALUE_STRUCT_SPEC:
return "struct spec";
case CB_VALUE_USERDATA:
return "userdata";
}
return "";
}
inline const char *cb_value_type_of(struct cb_value *val)
{
return cb_value_type_friendly_name(val->type);
}
int cb_value_call(struct cb_value fn, struct cb_value *args, size_t args_len,
struct cb_value *result)
{
struct cb_function *func;
if (fn.type != CB_VALUE_FUNCTION) {
fprintf(stderr, "Value of type %s is not callable\n",
cb_value_type_of(&fn));
return 1;
}
func = fn.val.as_function;
if (func->type == CB_FUNCTION_NATIVE)
return func->value.as_native(args_len, args, result);
else
return cb_vm_call_user_func(fn, args, args_len, result);
}
int cb_value_is_marked(const struct cb_value *val)
{
switch (val->type) {
case CB_VALUE_INT:
case CB_VALUE_DOUBLE:
case CB_VALUE_BOOL:
case CB_VALUE_CHAR:
case CB_VALUE_NULL:
case CB_VALUE_INTERNED_STRING:
case CB_VALUE_USERDATA:
return 1;
case CB_VALUE_STRING:
return cb_gc_is_marked(&val->val.as_string->gc_header);
case CB_VALUE_BYTES:
return cb_gc_is_marked(&val->val.as_bytes->gc_header);
case CB_VALUE_ARRAY:
return cb_gc_is_marked(&val->val.as_array->gc_header);
case CB_VALUE_FUNCTION:
return cb_gc_is_marked(&val->val.as_function->gc_header);
case CB_VALUE_STRUCT:
return cb_gc_is_marked(&val->val.as_struct->gc_header);
case CB_VALUE_STRUCT_SPEC:
return cb_gc_is_marked(&val->val.as_struct_spec->gc_header);
}
fprintf(stderr, "Unknown value type %d\n", val->type);
abort();
}
void cb_value_mark(struct cb_value *val)
{
#define GC_LOG(F) ({ \
if (cb_options.debug_gc) { \
cb_str as_str = cb_value_to_string(val); \
printf("GC: marked value at %p: %s\n", \
(cb_gc_header *) (F), \
cb_strptr(&as_str)); \
cb_str_free(as_str); \
} \
})
if (cb_value_is_marked(val))
return;
switch (val->type) {
case CB_VALUE_INT:
case CB_VALUE_DOUBLE:
case CB_VALUE_BOOL:
case CB_VALUE_CHAR:
case CB_VALUE_NULL:
case CB_VALUE_INTERNED_STRING:
case CB_VALUE_USERDATA:
return;
case CB_VALUE_STRING:
GC_LOG(val->val.as_string);
cb_gc_mark(&val->val.as_string->gc_header);
break;
case CB_VALUE_BYTES:
GC_LOG(val->val.as_bytes);
cb_gc_mark(&val->val.as_bytes->gc_header);
break;
case CB_VALUE_ARRAY: {
GC_LOG(val->val.as_array);
cb_gc_mark(&val->val.as_array->gc_header);
for (unsigned i = 0; i < val->val.as_array->len; i += 1)
cb_gc_queue_mark(&val->val.as_array->values[i]);
break;
}
case CB_VALUE_FUNCTION: {
struct cb_function *fn;
struct cb_upvalue *uv;
fn = val->val.as_function;
GC_LOG(fn);
cb_gc_mark(&fn->gc_header);
if (fn->type == CB_FUNCTION_USER) {
for (unsigned i = 0; i < fn->value.as_user.upvalues_len;
i += 1) {
uv = fn->value.as_user.upvalues[i];
if (!uv->is_open)
cb_gc_queue_mark(&uv->v.value);
}
}
break;
}
case CB_VALUE_STRUCT: {
GC_LOG(val->val.as_struct);
cb_gc_mark(&val->val.as_struct->gc_header);
cb_gc_mark(&val->val.as_struct->spec->gc_header);
for (unsigned i = 0; i < val->val.as_struct->spec->nfields;
i += 1)
cb_gc_queue_mark(&val->val.as_struct->fields[i]);
break;
}
case CB_VALUE_STRUCT_SPEC:
GC_LOG(val->val.as_struct_spec);
cb_gc_mark(&val->val.as_struct_spec->gc_header);
break;
}
}
inline struct cb_value cb_int(int64_t v)
{
struct cb_value out;
out.type = CB_VALUE_INT;
out.val.as_int = v;
return out;
}
inline struct cb_value cb_double(double v)
{
struct cb_value out;
out.type = CB_VALUE_DOUBLE;
out.val.as_double = v;
return out;
}
inline struct cb_value cb_bool(int v)
{
struct cb_value out;
out.type = CB_VALUE_BOOL;
out.val.as_bool = v;
return out;
}
inline struct cb_value cb_char(uint32_t v)
{
struct cb_value out;
out.type = CB_VALUE_CHAR;
out.val.as_char = v;
return out;
}
struct cb_value cb_value_from_string(const char *str)
{
struct cb_value retval;
struct cb_string *sobj = cb_string_new();
sobj->string = cb_str_from_cstr(str, strlen(str));
retval.type = CB_VALUE_STRING;
retval.val.as_string = sobj;
return retval;
}
struct cb_value cb_value_from_fmt(const char *fmt, ...)
{
va_list args;
va_start(args, fmt);
size_t len = vsnprintf(NULL, 0, fmt, args);
va_end(args);
char *str = malloc(sizeof(char) * len + 1);
va_start(args, fmt);
vsnprintf(str, len + 1, fmt, args);
str[len] = 0;
va_end(args);
struct cb_value ret = cb_value_from_string(str);
free(str);
return ret;
}
struct cb_bytes *cb_bytes_new(size_t size)
{
return cb_malloc(sizeof(struct cb_bytes) + size, NULL);
}
struct cb_value cb_bytes_new_value(size_t size)
{
struct cb_value val;
val.type = CB_VALUE_BYTES;
val.val.as_bytes = cb_bytes_new(size);
return val;
}