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php-src/Zend/zend_constants.c

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/*
+----------------------------------------------------------------------+
| Zend Engine |
+----------------------------------------------------------------------+
| Copyright (c) 1998-2017 Zend Technologies Ltd. (http://www.zend.com) |
+----------------------------------------------------------------------+
| This source file is subject to version 2.00 of the Zend license, |
| that is bundled with this package in the file LICENSE, and is |
| available through the world-wide-web at the following url: |
| http://www.zend.com/license/2_00.txt. |
| If you did not receive a copy of the Zend license and are unable to |
| obtain it through the world-wide-web, please send a note to |
| license@zend.com so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
| Authors: Andi Gutmans <andi@zend.com> |
| Zeev Suraski <zeev@zend.com> |
+----------------------------------------------------------------------+
*/
/* $Id$ */
#include "zend.h"
#include "zend_constants.h"
#include "zend_exceptions.h"
#include "zend_execute.h"
#include "zend_variables.h"
#include "zend_operators.h"
#include "zend_globals.h"
#include "zend_API.h"
void free_zend_constant(zval *zv)
{
zend_constant *c = Z_PTR_P(zv);
if (!(c->flags & CONST_PERSISTENT)) {
zval_ptr_dtor(&c->value);
} else {
zval_internal_dtor(&c->value);
}
if (c->name) {
zend_string_release(c->name);
}
pefree(c, c->flags & CONST_PERSISTENT);
}
static void copy_zend_constant(zval *zv)
{
zend_constant *c = Z_PTR_P(zv);
Z_PTR_P(zv) = pemalloc(sizeof(zend_constant), c->flags & CONST_PERSISTENT);
memcpy(Z_PTR_P(zv), c, sizeof(zend_constant));
c = Z_PTR_P(zv);
c->name = zend_string_copy(c->name);
if (!(c->flags & CONST_PERSISTENT)) {
zval_copy_ctor(&c->value);
} else {
if (Z_TYPE(c->value) == IS_STRING) {
Z_STR(c->value) = zend_string_dup(Z_STR(c->value), 1);
}
}
}
void zend_copy_constants(HashTable *target, HashTable *source)
{
zend_hash_copy(target, source, copy_zend_constant);
}
static int clean_module_constant(zval *el, void *arg)
{
zend_constant *c = (zend_constant *)Z_PTR_P(el);
int module_number = *(int *)arg;
if (c->module_number == module_number) {
return 1;
} else {
return 0;
}
}
void clean_module_constants(int module_number)
{
zend_hash_apply_with_argument(EG(zend_constants), clean_module_constant, (void *) &module_number);
}
int zend_startup_constants(void)
{
EG(zend_constants) = (HashTable *) malloc(sizeof(HashTable));
zend_hash_init(EG(zend_constants), 128, NULL, ZEND_CONSTANT_DTOR, 1);
return SUCCESS;
}
void zend_register_standard_constants(void)
{
REGISTER_MAIN_LONG_CONSTANT("E_ERROR", E_ERROR, CONST_PERSISTENT | CONST_CS);
REGISTER_MAIN_LONG_CONSTANT("E_RECOVERABLE_ERROR", E_RECOVERABLE_ERROR, CONST_PERSISTENT | CONST_CS);
REGISTER_MAIN_LONG_CONSTANT("E_WARNING", E_WARNING, CONST_PERSISTENT | CONST_CS);
REGISTER_MAIN_LONG_CONSTANT("E_PARSE", E_PARSE, CONST_PERSISTENT | CONST_CS);
REGISTER_MAIN_LONG_CONSTANT("E_NOTICE", E_NOTICE, CONST_PERSISTENT | CONST_CS);
REGISTER_MAIN_LONG_CONSTANT("E_STRICT", E_STRICT, CONST_PERSISTENT | CONST_CS);
REGISTER_MAIN_LONG_CONSTANT("E_DEPRECATED", E_DEPRECATED, CONST_PERSISTENT | CONST_CS);
REGISTER_MAIN_LONG_CONSTANT("E_CORE_ERROR", E_CORE_ERROR, CONST_PERSISTENT | CONST_CS);
REGISTER_MAIN_LONG_CONSTANT("E_CORE_WARNING", E_CORE_WARNING, CONST_PERSISTENT | CONST_CS);
REGISTER_MAIN_LONG_CONSTANT("E_COMPILE_ERROR", E_COMPILE_ERROR, CONST_PERSISTENT | CONST_CS);
REGISTER_MAIN_LONG_CONSTANT("E_COMPILE_WARNING", E_COMPILE_WARNING, CONST_PERSISTENT | CONST_CS);
REGISTER_MAIN_LONG_CONSTANT("E_USER_ERROR", E_USER_ERROR, CONST_PERSISTENT | CONST_CS);
REGISTER_MAIN_LONG_CONSTANT("E_USER_WARNING", E_USER_WARNING, CONST_PERSISTENT | CONST_CS);
REGISTER_MAIN_LONG_CONSTANT("E_USER_NOTICE", E_USER_NOTICE, CONST_PERSISTENT | CONST_CS);
REGISTER_MAIN_LONG_CONSTANT("E_USER_DEPRECATED", E_USER_DEPRECATED, CONST_PERSISTENT | CONST_CS);
REGISTER_MAIN_LONG_CONSTANT("E_ALL", E_ALL, CONST_PERSISTENT | CONST_CS);
REGISTER_MAIN_LONG_CONSTANT("DEBUG_BACKTRACE_PROVIDE_OBJECT", DEBUG_BACKTRACE_PROVIDE_OBJECT, CONST_PERSISTENT | CONST_CS);
REGISTER_MAIN_LONG_CONSTANT("DEBUG_BACKTRACE_IGNORE_ARGS", DEBUG_BACKTRACE_IGNORE_ARGS, CONST_PERSISTENT | CONST_CS);
/* true/false constants */
{
REGISTER_MAIN_BOOL_CONSTANT("TRUE", 1, CONST_PERSISTENT | CONST_CT_SUBST);
REGISTER_MAIN_BOOL_CONSTANT("FALSE", 0, CONST_PERSISTENT | CONST_CT_SUBST);
REGISTER_MAIN_BOOL_CONSTANT("ZEND_THREAD_SAFE", ZTS_V, CONST_PERSISTENT | CONST_CS);
REGISTER_MAIN_BOOL_CONSTANT("ZEND_DEBUG_BUILD", ZEND_DEBUG, CONST_PERSISTENT | CONST_CS);
}
REGISTER_MAIN_NULL_CONSTANT("NULL", CONST_PERSISTENT | CONST_CT_SUBST);
}
int zend_shutdown_constants(void)
{
zend_hash_destroy(EG(zend_constants));
free(EG(zend_constants));
return SUCCESS;
}
ZEND_API void zend_register_null_constant(const char *name, size_t name_len, int flags, int module_number)
{
zend_constant c;
ZVAL_NULL(&c.value);
c.flags = flags;
c.name = zend_string_init(name, name_len, flags & CONST_PERSISTENT);
c.module_number = module_number;
zend_register_constant(&c);
}
ZEND_API void zend_register_bool_constant(const char *name, size_t name_len, zend_bool bval, int flags, int module_number)
{
zend_constant c;
ZVAL_BOOL(&c.value, bval);
c.flags = flags;
c.name = zend_string_init(name, name_len, flags & CONST_PERSISTENT);
c.module_number = module_number;
zend_register_constant(&c);
}
ZEND_API void zend_register_long_constant(const char *name, size_t name_len, zend_long lval, int flags, int module_number)
{
zend_constant c;
ZVAL_LONG(&c.value, lval);
c.flags = flags;
c.name = zend_string_init(name, name_len, flags & CONST_PERSISTENT);
c.module_number = module_number;
zend_register_constant(&c);
}
ZEND_API void zend_register_double_constant(const char *name, size_t name_len, double dval, int flags, int module_number)
{
zend_constant c;
ZVAL_DOUBLE(&c.value, dval);
c.flags = flags;
c.name = zend_string_init(name, name_len, flags & CONST_PERSISTENT);
c.module_number = module_number;
zend_register_constant(&c);
}
ZEND_API void zend_register_stringl_constant(const char *name, size_t name_len, char *strval, size_t strlen, int flags, int module_number)
{
zend_constant c;
ZVAL_NEW_STR(&c.value, zend_string_init(strval, strlen, flags & CONST_PERSISTENT));
c.flags = flags;
c.name = zend_string_init(name, name_len, flags & CONST_PERSISTENT);
c.module_number = module_number;
zend_register_constant(&c);
}
ZEND_API void zend_register_string_constant(const char *name, size_t name_len, char *strval, int flags, int module_number)
{
zend_register_stringl_constant(name, name_len, strval, strlen(strval), flags, module_number);
}
static zend_constant *zend_get_special_constant(const char *name, size_t name_len)
{
zend_constant *c;
static char haltoff[] = "__COMPILER_HALT_OFFSET__";
if (!EG(current_execute_data)) {
return NULL;
} else if (name_len == sizeof("__COMPILER_HALT_OFFSET__")-1 &&
!memcmp(name, "__COMPILER_HALT_OFFSET__", sizeof("__COMPILER_HALT_OFFSET__")-1)) {
const char *cfilename;
zend_string *haltname;
size_t clen;
cfilename = zend_get_executed_filename();
clen = strlen(cfilename);
/* check for __COMPILER_HALT_OFFSET__ */
haltname = zend_mangle_property_name(haltoff,
sizeof("__COMPILER_HALT_OFFSET__") - 1, cfilename, clen, 0);
c = zend_hash_find_ptr(EG(zend_constants), haltname);
zend_string_free(haltname);
return c;
} else {
return NULL;
}
}
ZEND_API int zend_verify_const_access(zend_class_constant *c, zend_class_entry *scope) /* {{{ */
{
if (Z_ACCESS_FLAGS(c->value) & ZEND_ACC_PUBLIC) {
return 1;
} else if (Z_ACCESS_FLAGS(c->value) & ZEND_ACC_PRIVATE) {
return (c->ce == scope);
} else {
ZEND_ASSERT(Z_ACCESS_FLAGS(c->value) & ZEND_ACC_PROTECTED);
return zend_check_protected(c->ce, scope);
}
}
/* }}} */
ZEND_API zval *zend_get_constant_str(const char *name, size_t name_len)
{
zend_constant *c;
ALLOCA_FLAG(use_heap)
if ((c = zend_hash_str_find_ptr(EG(zend_constants), name, name_len)) == NULL) {
char *lcname = do_alloca(name_len + 1, use_heap);
zend_str_tolower_copy(lcname, name, name_len);
if ((c = zend_hash_str_find_ptr(EG(zend_constants), lcname, name_len)) != NULL) {
if (c->flags & CONST_CS) {
c = NULL;
}
} else {
c = zend_get_special_constant(name, name_len);
}
free_alloca(lcname, use_heap);
}
return c ? &c->value : NULL;
}
ZEND_API zval *zend_get_constant(zend_string *name)
{
zend_constant *c;
ALLOCA_FLAG(use_heap)
if ((c = zend_hash_find_ptr(EG(zend_constants), name)) == NULL) {
char *lcname = do_alloca(ZSTR_LEN(name) + 1, use_heap);
zend_str_tolower_copy(lcname, ZSTR_VAL(name), ZSTR_LEN(name));
if ((c = zend_hash_str_find_ptr(EG(zend_constants), lcname, ZSTR_LEN(name))) != NULL) {
if (c->flags & CONST_CS) {
c = NULL;
}
} else {
c = zend_get_special_constant(ZSTR_VAL(name), ZSTR_LEN(name));
}
free_alloca(lcname, use_heap);
}
return c ? &c->value : NULL;
}
ZEND_API zval *zend_get_constant_ex(zend_string *cname, zend_class_entry *scope, uint32_t flags)
{
zend_constant *c;
const char *colon;
zend_class_entry *ce = NULL;
const char *name = ZSTR_VAL(cname);
size_t name_len = ZSTR_LEN(cname);
/* Skip leading \\ */
if (name[0] == '\\') {
name += 1;
name_len -= 1;
cname = NULL;
}
if ((colon = zend_memrchr(name, ':', name_len)) &&
colon > name && (*(colon - 1) == ':')) {
int class_name_len = colon - name - 1;
size_t const_name_len = name_len - class_name_len - 2;
zend_string *constant_name = zend_string_init(colon + 1, const_name_len, 0);
zend_string *class_name = zend_string_init(name, class_name_len, 0);
zend_class_constant *c = NULL;
zval *ret_constant = NULL;
if (zend_string_equals_literal_ci(class_name, "self")) {
if (UNEXPECTED(!scope)) {
zend_throw_error(NULL, "Cannot access self:: when no class scope is active");
goto failure;
}
ce = scope;
} else if (zend_string_equals_literal_ci(class_name, "parent")) {
if (UNEXPECTED(!scope)) {
zend_throw_error(NULL, "Cannot access parent:: when no class scope is active");
goto failure;
} else if (UNEXPECTED(!scope->parent)) {
zend_throw_error(NULL, "Cannot access parent:: when current class scope has no parent");
goto failure;
} else {
ce = scope->parent;
}
} else if (zend_string_equals_literal_ci(class_name, "static")) {
ce = zend_get_called_scope(EG(current_execute_data));
if (UNEXPECTED(!ce)) {
zend_throw_error(NULL, "Cannot access static:: when no class scope is active");
goto failure;
}
} else {
ce = zend_fetch_class(class_name, flags);
}
if (ce) {
c = zend_hash_find_ptr(&ce->constants_table, constant_name);
if (c == NULL) {
if ((flags & ZEND_FETCH_CLASS_SILENT) == 0) {
zend_throw_error(NULL, "Undefined class constant '%s::%s'", ZSTR_VAL(class_name), ZSTR_VAL(constant_name));
goto failure;
}
ret_constant = NULL;
} else {
if (!zend_verify_const_access(c, scope)) {
zend_throw_error(NULL, "Cannot access %s const %s::%s", zend_visibility_string(Z_ACCESS_FLAGS(c->value)), ZSTR_VAL(class_name), ZSTR_VAL(constant_name));
goto failure;
}
ret_constant = &c->value;
}
}
if (ret_constant && Z_TYPE_P(ret_constant) == IS_CONSTANT_AST) {
if (Z_TYPE_P(ret_constant) == IS_CONSTANT_AST) {
if (IS_CONSTANT_VISITED(ret_constant)) {
zend_throw_error(NULL, "Cannot declare self-referencing constant '%s::%s'", ZSTR_VAL(class_name), ZSTR_VAL(constant_name));
ret_constant = NULL;
goto failure;
}
MARK_CONSTANT_VISITED(ret_constant);
}
if (UNEXPECTED(zval_update_constant_ex(ret_constant, c->ce) != SUCCESS)) {
RESET_CONSTANT_VISITED(ret_constant);
ret_constant = NULL;
goto failure;
}
RESET_CONSTANT_VISITED(ret_constant);
}
failure:
zend_string_release(class_name);
zend_string_free(constant_name);
return ret_constant;
}
/* non-class constant */
if ((colon = zend_memrchr(name, '\\', name_len)) != NULL) {
/* compound constant name */
int prefix_len = colon - name;
size_t const_name_len = name_len - prefix_len - 1;
const char *constant_name = colon + 1;
char *lcname;
size_t lcname_len;
ALLOCA_FLAG(use_heap)
lcname_len = prefix_len + 1 + const_name_len;
lcname = do_alloca(lcname_len + 1, use_heap);
zend_str_tolower_copy(lcname, name, prefix_len);
/* Check for namespace constant */
lcname[prefix_len] = '\\';
memcpy(lcname + prefix_len + 1, constant_name, const_name_len + 1);
if ((c = zend_hash_str_find_ptr(EG(zend_constants), lcname, lcname_len)) == NULL) {
/* try lowercase */
zend_str_tolower(lcname + prefix_len + 1, const_name_len);
if ((c = zend_hash_str_find_ptr(EG(zend_constants), lcname, lcname_len)) != NULL) {
if ((c->flags & CONST_CS) != 0) {
c = NULL;
}
}
}
free_alloca(lcname, use_heap);
if (c) {
return &c->value;
}
/* name requires runtime resolution, need to check non-namespaced name */
if ((flags & IS_CONSTANT_UNQUALIFIED) != 0) {
return zend_get_constant_str(constant_name, const_name_len);
}
return NULL;
}
if (cname) {
return zend_get_constant(cname);
} else {
return zend_get_constant_str(name, name_len);
}
}
ZEND_API zend_constant* ZEND_FASTCALL zend_quick_get_constant(const zval *key, uint32_t flags)
{
zend_constant *c;
if ((c = zend_hash_find_ptr(EG(zend_constants), Z_STR_P(key))) == NULL) {
key++;
if ((c = zend_hash_find_ptr(EG(zend_constants), Z_STR_P(key))) == NULL ||
(c->flags & CONST_CS) != 0) {
if ((flags & (IS_CONSTANT_IN_NAMESPACE|IS_CONSTANT_UNQUALIFIED)) == (IS_CONSTANT_IN_NAMESPACE|IS_CONSTANT_UNQUALIFIED)) {
key++;
if ((c = zend_hash_find_ptr(EG(zend_constants), Z_STR_P(key))) == NULL) {
key++;
if ((c = zend_hash_find_ptr(EG(zend_constants), Z_STR_P(key))) == NULL ||
(c->flags & CONST_CS) != 0) {
key--;
c = NULL;
}
}
} else {
key--;
c = NULL;
}
}
}
return c;
}
static void* zend_hash_add_constant(HashTable *ht, zend_string *key, zend_constant *c)
{
void *ret;
zend_constant *copy = pemalloc(sizeof(zend_constant), c->flags & CONST_PERSISTENT);
memcpy(copy, c, sizeof(zend_constant));
ret = zend_hash_add_ptr(ht, key, copy);
if (!ret) {
pefree(copy, c->flags & CONST_PERSISTENT);
}
return ret;
}
ZEND_API int zend_register_constant(zend_constant *c)
{
zend_string *lowercase_name = NULL;
zend_string *name;
int ret = SUCCESS;
#if 0
printf("Registering constant for module %d\n", c->module_number);
#endif
if (c->module_number != PHP_USER_CONSTANT) {
c->name = zend_new_interned_string(c->name);
}
if (!(c->flags & CONST_CS)) {
lowercase_name = zend_string_alloc(ZSTR_LEN(c->name), c->flags & CONST_PERSISTENT);
zend_str_tolower_copy(ZSTR_VAL(lowercase_name), ZSTR_VAL(c->name), ZSTR_LEN(c->name));
lowercase_name = zend_new_interned_string(lowercase_name);
name = lowercase_name;
} else {
char *slash = strrchr(ZSTR_VAL(c->name), '\\');
if (slash) {
lowercase_name = zend_string_init(ZSTR_VAL(c->name), ZSTR_LEN(c->name), c->flags & CONST_PERSISTENT);
zend_str_tolower(ZSTR_VAL(lowercase_name), slash - ZSTR_VAL(c->name));
lowercase_name = zend_new_interned_string(lowercase_name);
name = lowercase_name;
} else {
name = c->name;
}
}
/* Check if the user is trying to define the internal pseudo constant name __COMPILER_HALT_OFFSET__ */
if ((ZSTR_LEN(c->name) == sizeof("__COMPILER_HALT_OFFSET__")-1
&& !memcmp(ZSTR_VAL(name), "__COMPILER_HALT_OFFSET__", sizeof("__COMPILER_HALT_OFFSET__")-1))
|| zend_hash_add_constant(EG(zend_constants), name, c) == NULL) {
/* The internal __COMPILER_HALT_OFFSET__ is prefixed by NULL byte */
if (ZSTR_VAL(c->name)[0] == '\0' && ZSTR_LEN(c->name) > sizeof("\0__COMPILER_HALT_OFFSET__")-1
&& memcmp(ZSTR_VAL(name), "\0__COMPILER_HALT_OFFSET__", sizeof("\0__COMPILER_HALT_OFFSET__")) == 0) {
}
zend_error(E_NOTICE,"Constant %s already defined", ZSTR_VAL(name));
zend_string_release(c->name);
if (!(c->flags & CONST_PERSISTENT)) {
zval_dtor(&c->value);
}
ret = FAILURE;
}
if (lowercase_name) {
zend_string_release(lowercase_name);
}
return ret;
}
/*
* Local variables:
* tab-width: 4
* c-basic-offset: 4
* indent-tabs-mode: t
* End:
* vim600: sw=4 ts=4 fdm=marker
* vim<600: sw=4 ts=4
*/
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