mirror of
https://github.com/php/php-src.git
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594 lines
18 KiB
C
594 lines
18 KiB
C
/*
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+----------------------------------------------------------------------+
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| Zend Engine |
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+----------------------------------------------------------------------+
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| Copyright (c) Zend Technologies Ltd. (http://www.zend.com) |
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+----------------------------------------------------------------------+
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| This source file is subject to version 2.00 of the Zend license, |
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| that is bundled with this package in the file LICENSE, and is |
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| available through the world-wide-web at the following url: |
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| http://www.zend.com/license/2_00.txt. |
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| If you did not receive a copy of the Zend license and are unable to |
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| obtain it through the world-wide-web, please send a note to |
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| license@zend.com so we can mail you a copy immediately. |
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+----------------------------------------------------------------------+
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| Authors: Andi Gutmans <andi@php.net> |
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| Zeev Suraski <zeev@php.net> |
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+----------------------------------------------------------------------+
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*/
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#include "zend.h"
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#include "zend_constants.h"
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#include "zend_exceptions.h"
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#include "zend_execute.h"
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#include "zend_variables.h"
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#include "zend_operators.h"
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#include "zend_globals.h"
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#include "zend_API.h"
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#include "zend_constants_arginfo.h"
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/* Protection from recursive self-referencing class constants */
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#define IS_CONSTANT_VISITED_MARK 0x80
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#define IS_CONSTANT_VISITED(zv) (Z_CONSTANT_FLAGS_P(zv) & IS_CONSTANT_VISITED_MARK)
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#define MARK_CONSTANT_VISITED(zv) Z_CONSTANT_FLAGS_P(zv) |= IS_CONSTANT_VISITED_MARK
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#define RESET_CONSTANT_VISITED(zv) Z_CONSTANT_FLAGS_P(zv) &= ~IS_CONSTANT_VISITED_MARK
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/* Use for special null/true/false constants. */
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static zend_constant *null_const, *true_const, *false_const;
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void free_zend_constant(zval *zv)
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{
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zend_constant *c = Z_PTR_P(zv);
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if (!(ZEND_CONSTANT_FLAGS(c) & CONST_PERSISTENT)) {
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zval_ptr_dtor_nogc(&c->value);
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if (c->name) {
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zend_string_release_ex(c->name, 0);
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}
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efree(c);
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} else {
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zval_internal_ptr_dtor(&c->value);
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if (c->name) {
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zend_string_release_ex(c->name, 1);
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}
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free(c);
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}
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}
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#ifdef ZTS
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static void copy_zend_constant(zval *zv)
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{
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zend_constant *c = Z_PTR_P(zv);
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ZEND_ASSERT(ZEND_CONSTANT_FLAGS(c) & CONST_PERSISTENT);
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Z_PTR_P(zv) = pemalloc(sizeof(zend_constant), 1);
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memcpy(Z_PTR_P(zv), c, sizeof(zend_constant));
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c = Z_PTR_P(zv);
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c->name = zend_string_copy(c->name);
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if (Z_TYPE(c->value) == IS_STRING) {
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Z_STR(c->value) = zend_string_dup(Z_STR(c->value), 1);
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}
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}
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void zend_copy_constants(HashTable *target, HashTable *source)
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{
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zend_hash_copy(target, source, copy_zend_constant);
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}
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#endif
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static int clean_module_constant(zval *el, void *arg)
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{
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zend_constant *c = (zend_constant *)Z_PTR_P(el);
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int module_number = *(int *)arg;
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if (ZEND_CONSTANT_MODULE_NUMBER(c) == module_number) {
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return ZEND_HASH_APPLY_REMOVE;
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} else {
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return ZEND_HASH_APPLY_KEEP;
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}
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}
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void clean_module_constants(int module_number)
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{
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zend_hash_apply_with_argument(EG(zend_constants), clean_module_constant, (void *) &module_number);
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}
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void zend_startup_constants(void)
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{
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EG(zend_constants) = (HashTable *) malloc(sizeof(HashTable));
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zend_hash_init(EG(zend_constants), 128, NULL, ZEND_CONSTANT_DTOR, 1);
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}
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void zend_register_standard_constants(void)
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{
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register_zend_constants_symbols(0);
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true_const = zend_hash_str_find_ptr(EG(zend_constants), "TRUE", sizeof("TRUE")-1);
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false_const = zend_hash_str_find_ptr(EG(zend_constants), "FALSE", sizeof("FALSE")-1);
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null_const = zend_hash_str_find_ptr(EG(zend_constants), "NULL", sizeof("NULL")-1);
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}
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void zend_shutdown_constants(void)
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{
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zend_hash_destroy(EG(zend_constants));
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free(EG(zend_constants));
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}
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ZEND_API void zend_register_null_constant(const char *name, size_t name_len, int flags, int module_number)
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{
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zend_constant c;
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ZVAL_NULL(&c.value);
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ZEND_CONSTANT_SET_FLAGS(&c, flags, module_number);
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c.name = zend_string_init_interned(name, name_len, flags & CONST_PERSISTENT);
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zend_register_constant(&c);
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}
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ZEND_API void zend_register_bool_constant(const char *name, size_t name_len, bool bval, int flags, int module_number)
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{
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zend_constant c;
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ZVAL_BOOL(&c.value, bval);
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ZEND_CONSTANT_SET_FLAGS(&c, flags, module_number);
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c.name = zend_string_init_interned(name, name_len, flags & CONST_PERSISTENT);
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zend_register_constant(&c);
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}
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ZEND_API void zend_register_long_constant(const char *name, size_t name_len, zend_long lval, int flags, int module_number)
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{
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zend_constant c;
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ZVAL_LONG(&c.value, lval);
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ZEND_CONSTANT_SET_FLAGS(&c, flags, module_number);
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c.name = zend_string_init_interned(name, name_len, flags & CONST_PERSISTENT);
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zend_register_constant(&c);
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}
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ZEND_API void zend_register_double_constant(const char *name, size_t name_len, double dval, int flags, int module_number)
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{
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zend_constant c;
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ZVAL_DOUBLE(&c.value, dval);
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ZEND_CONSTANT_SET_FLAGS(&c, flags, module_number);
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c.name = zend_string_init_interned(name, name_len, flags & CONST_PERSISTENT);
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zend_register_constant(&c);
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}
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ZEND_API void zend_register_stringl_constant(const char *name, size_t name_len, const char *strval, size_t strlen, int flags, int module_number)
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{
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zend_constant c;
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ZVAL_STR(&c.value, zend_string_init_interned(strval, strlen, flags & CONST_PERSISTENT));
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ZEND_CONSTANT_SET_FLAGS(&c, flags, module_number);
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c.name = zend_string_init_interned(name, name_len, flags & CONST_PERSISTENT);
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zend_register_constant(&c);
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}
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ZEND_API void zend_register_string_constant(const char *name, size_t name_len, const char *strval, int flags, int module_number)
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{
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zend_register_stringl_constant(name, name_len, strval, strlen(strval), flags, module_number);
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}
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static zend_constant *zend_get_halt_offset_constant(const char *name, size_t name_len)
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{
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zend_constant *c;
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static const char haltoff[] = "__COMPILER_HALT_OFFSET__";
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if (!EG(current_execute_data)) {
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return NULL;
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} else if (name_len == sizeof("__COMPILER_HALT_OFFSET__")-1 &&
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!memcmp(name, "__COMPILER_HALT_OFFSET__", sizeof("__COMPILER_HALT_OFFSET__")-1)) {
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const char *cfilename;
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zend_string *haltname;
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size_t clen;
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cfilename = zend_get_executed_filename();
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clen = strlen(cfilename);
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/* check for __COMPILER_HALT_OFFSET__ */
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haltname = zend_mangle_property_name(haltoff,
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sizeof("__COMPILER_HALT_OFFSET__") - 1, cfilename, clen, 0);
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c = zend_hash_find_ptr(EG(zend_constants), haltname);
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zend_string_efree(haltname);
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return c;
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} else {
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return NULL;
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}
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}
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ZEND_API zend_constant *_zend_get_special_const(const char *name, size_t len) /* {{{ */
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{
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if (len == 4) {
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if ((name[0] == 'n' || name[0] == 'N') &&
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(name[1] == 'u' || name[1] == 'U') &&
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(name[2] == 'l' || name[2] == 'L') &&
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(name[3] == 'l' || name[3] == 'L')
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) {
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return null_const;
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}
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if ((name[0] == 't' || name[0] == 'T') &&
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(name[1] == 'r' || name[1] == 'R') &&
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(name[2] == 'u' || name[2] == 'U') &&
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(name[3] == 'e' || name[3] == 'E')
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) {
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return true_const;
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}
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} else {
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if ((name[0] == 'f' || name[0] == 'F') &&
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(name[1] == 'a' || name[1] == 'A') &&
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(name[2] == 'l' || name[2] == 'L') &&
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(name[3] == 's' || name[3] == 'S') &&
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(name[4] == 'e' || name[4] == 'E')
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) {
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return false_const;
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}
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}
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return NULL;
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}
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/* }}} */
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ZEND_API bool zend_verify_const_access(zend_class_constant *c, zend_class_entry *scope) /* {{{ */
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{
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if (ZEND_CLASS_CONST_FLAGS(c) & ZEND_ACC_PUBLIC) {
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return 1;
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} else if (ZEND_CLASS_CONST_FLAGS(c) & ZEND_ACC_PRIVATE) {
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return (c->ce == scope);
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} else {
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ZEND_ASSERT(ZEND_CLASS_CONST_FLAGS(c) & ZEND_ACC_PROTECTED);
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return zend_check_protected(c->ce, scope);
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}
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}
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/* }}} */
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static zend_constant *zend_get_constant_str_impl(const char *name, size_t name_len)
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{
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zend_constant *c = zend_hash_str_find_ptr(EG(zend_constants), name, name_len);
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if (c) {
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return c;
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}
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c = zend_get_halt_offset_constant(name, name_len);
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if (c) {
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return c;
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}
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return zend_get_special_const(name, name_len);
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}
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ZEND_API zval *zend_get_constant_str(const char *name, size_t name_len)
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{
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zend_constant *c = zend_get_constant_str_impl(name, name_len);
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if (c) {
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return &c->value;
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}
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return NULL;
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}
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static zend_constant *zend_get_constant_impl(zend_string *name)
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{
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zend_constant *c = zend_hash_find_ptr(EG(zend_constants), name);
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if (c) {
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return c;
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}
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c = zend_get_halt_offset_constant(ZSTR_VAL(name), ZSTR_LEN(name));
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if (c) {
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return c;
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}
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return zend_get_special_const(ZSTR_VAL(name), ZSTR_LEN(name));
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}
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ZEND_API zval *zend_get_constant(zend_string *name)
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{
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zend_constant *c = zend_get_constant_impl(name);
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if (c) {
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return &c->value;
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}
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return NULL;
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}
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ZEND_API zval *zend_get_class_constant_ex(zend_string *class_name, zend_string *constant_name, zend_class_entry *scope, uint32_t flags)
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{
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zend_class_entry *ce = NULL;
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zend_class_constant *c = NULL;
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zval *ret_constant = NULL;
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if (ZSTR_HAS_CE_CACHE(class_name)) {
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ce = ZSTR_GET_CE_CACHE(class_name);
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if (!ce) {
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ce = zend_fetch_class(class_name, flags);
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}
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} else if (zend_string_equals_literal_ci(class_name, "self")) {
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if (UNEXPECTED(!scope)) {
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zend_throw_error(NULL, "Cannot access \"self\" when no class scope is active");
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goto failure;
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}
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ce = scope;
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} else if (zend_string_equals_literal_ci(class_name, "parent")) {
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if (UNEXPECTED(!scope)) {
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zend_throw_error(NULL, "Cannot access \"parent\" when no class scope is active");
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goto failure;
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} else if (UNEXPECTED(!scope->parent)) {
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zend_throw_error(NULL, "Cannot access \"parent\" when current class scope has no parent");
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goto failure;
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} else {
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ce = scope->parent;
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}
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} else if (zend_string_equals_ci(class_name, ZSTR_KNOWN(ZEND_STR_STATIC))) {
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ce = zend_get_called_scope(EG(current_execute_data));
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if (UNEXPECTED(!ce)) {
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zend_throw_error(NULL, "Cannot access \"static\" when no class scope is active");
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goto failure;
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}
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} else {
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ce = zend_fetch_class(class_name, flags);
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}
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if (ce) {
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c = zend_hash_find_ptr(CE_CONSTANTS_TABLE(ce), constant_name);
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if (c == NULL) {
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if ((flags & ZEND_FETCH_CLASS_SILENT) == 0) {
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zend_throw_error(NULL, "Undefined constant %s::%s", ZSTR_VAL(class_name), ZSTR_VAL(constant_name));
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goto failure;
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}
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ret_constant = NULL;
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} else {
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if (!zend_verify_const_access(c, scope)) {
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if ((flags & ZEND_FETCH_CLASS_SILENT) == 0) {
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zend_throw_error(NULL, "Cannot access %s constant %s::%s", zend_visibility_string(ZEND_CLASS_CONST_FLAGS(c)), ZSTR_VAL(class_name), ZSTR_VAL(constant_name));
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}
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goto failure;
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}
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if (UNEXPECTED(ce->ce_flags & ZEND_ACC_TRAIT)) {
|
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/** Prevent accessing trait constants directly on cases like \defined() or \constant(), etc. */
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if ((flags & ZEND_FETCH_CLASS_SILENT) == 0) {
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zend_throw_error(NULL, "Cannot access trait constant %s::%s directly", ZSTR_VAL(class_name), ZSTR_VAL(constant_name));
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}
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goto failure;
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}
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|
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if (UNEXPECTED(ZEND_CLASS_CONST_FLAGS(c) & ZEND_ACC_DEPRECATED)) {
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if ((flags & ZEND_FETCH_CLASS_SILENT) == 0) {
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zend_error(E_DEPRECATED, "Constant %s::%s is deprecated", ZSTR_VAL(class_name), ZSTR_VAL(constant_name));
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if (EG(exception)) {
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goto failure;
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}
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}
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}
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ret_constant = &c->value;
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}
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}
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|
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if (ret_constant && Z_TYPE_P(ret_constant) == IS_CONSTANT_AST) {
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zend_result ret;
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|
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if (IS_CONSTANT_VISITED(ret_constant)) {
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zend_throw_error(NULL, "Cannot declare self-referencing constant %s::%s", ZSTR_VAL(class_name), ZSTR_VAL(constant_name));
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ret_constant = NULL;
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goto failure;
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}
|
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|
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MARK_CONSTANT_VISITED(ret_constant);
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ret = zend_update_class_constant(c, constant_name, c->ce);
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RESET_CONSTANT_VISITED(ret_constant);
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|
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if (UNEXPECTED(ret != SUCCESS)) {
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ret_constant = NULL;
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goto failure;
|
|
}
|
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}
|
|
failure:
|
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return ret_constant;
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}
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|
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ZEND_API zval *zend_get_constant_ex(zend_string *cname, zend_class_entry *scope, uint32_t flags)
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{
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zend_constant *c;
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const char *colon;
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const char *name = ZSTR_VAL(cname);
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size_t name_len = ZSTR_LEN(cname);
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|
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/* Skip leading \\ */
|
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if (name[0] == '\\') {
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name += 1;
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name_len -= 1;
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cname = NULL;
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}
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|
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if ((colon = zend_memrchr(name, ':', name_len)) &&
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colon > name && (*(colon - 1) == ':')) {
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int class_name_len = colon - name - 1;
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size_t const_name_len = name_len - class_name_len - 2;
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zend_string *constant_name = zend_string_init(colon + 1, const_name_len, 0);
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zend_string *class_name = zend_string_init_interned(name, class_name_len, 0);
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zval *ret_constant = zend_get_class_constant_ex(class_name, constant_name, scope, flags);
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zend_string_release_ex(class_name, 0);
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zend_string_efree(constant_name);
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return ret_constant;
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|
/*
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zend_class_entry *ce = NULL;
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zend_class_constant *c = NULL;
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zval *ret_constant = NULL;
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if (zend_string_equals_literal_ci(class_name, "self")) {
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if (UNEXPECTED(!scope)) {
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zend_throw_error(NULL, "Cannot access \"self\" when no class scope is active");
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goto failure;
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}
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ce = scope;
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} else if (zend_string_equals_literal_ci(class_name, "parent")) {
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if (UNEXPECTED(!scope)) {
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zend_throw_error(NULL, "Cannot access \"parent\" when no class scope is active");
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goto failure;
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|
} else if (UNEXPECTED(!scope->parent)) {
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|
zend_throw_error(NULL, "Cannot access \"parent\" when current class scope has no parent");
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goto failure;
|
|
} else {
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|
ce = scope->parent;
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}
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|
} else if (zend_string_equals_ci(class_name, ZSTR_KNOWN(ZEND_STR_STATIC))) {
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ce = zend_get_called_scope(EG(current_execute_data));
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if (UNEXPECTED(!ce)) {
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zend_throw_error(NULL, "Cannot access \"static\" when no class scope is active");
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|
goto failure;
|
|
}
|
|
} else {
|
|
ce = zend_fetch_class(class_name, flags);
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|
}
|
|
if (ce) {
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|
c = zend_hash_find_ptr(CE_CONSTANTS_TABLE(ce), constant_name);
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|
if (c == NULL) {
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|
if ((flags & ZEND_FETCH_CLASS_SILENT) == 0) {
|
|
zend_throw_error(NULL, "Undefined constant %s::%s", ZSTR_VAL(class_name), ZSTR_VAL(constant_name));
|
|
goto failure;
|
|
}
|
|
ret_constant = NULL;
|
|
} else {
|
|
if (!zend_verify_const_access(c, scope)) {
|
|
if ((flags & ZEND_FETCH_CLASS_SILENT) == 0) {
|
|
zend_throw_error(NULL, "Cannot access %s constant %s::%s", zend_visibility_string(ZEND_CLASS_CONST_FLAGS(c)), 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) {
|
|
zend_result ret;
|
|
|
|
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);
|
|
ret = zval_update_constant_ex(ret_constant, c->ce);
|
|
RESET_CONSTANT_VISITED(ret_constant);
|
|
|
|
if (UNEXPECTED(ret != SUCCESS)) {
|
|
ret_constant = NULL;
|
|
goto failure;
|
|
}
|
|
}
|
|
failure:
|
|
zend_string_release_ex(class_name, 0);
|
|
zend_string_efree(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)
|
|
|
|
/* Lowercase the namespace portion */
|
|
lcname_len = prefix_len + 1 + const_name_len;
|
|
lcname = do_alloca(lcname_len + 1, use_heap);
|
|
zend_str_tolower_copy(lcname, name, prefix_len);
|
|
|
|
lcname[prefix_len] = '\\';
|
|
memcpy(lcname + prefix_len + 1, constant_name, const_name_len + 1);
|
|
|
|
c = zend_hash_str_find_ptr(EG(zend_constants), lcname, lcname_len);
|
|
free_alloca(lcname, use_heap);
|
|
|
|
if (!c) {
|
|
if (flags & IS_CONSTANT_UNQUALIFIED_IN_NAMESPACE) {
|
|
/* name requires runtime resolution, need to check non-namespaced name */
|
|
c = zend_get_constant_str_impl(constant_name, const_name_len);
|
|
}
|
|
}
|
|
} else {
|
|
if (cname) {
|
|
c = zend_get_constant_impl(cname);
|
|
} else {
|
|
c = zend_get_constant_str_impl(name, name_len);
|
|
}
|
|
}
|
|
|
|
if (!c) {
|
|
if (!(flags & ZEND_FETCH_CLASS_SILENT)) {
|
|
zend_throw_error(NULL, "Undefined constant \"%s\"", name);
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
if (!(flags & ZEND_FETCH_CLASS_SILENT) && (ZEND_CONSTANT_FLAGS(c) & CONST_DEPRECATED)) {
|
|
zend_error(E_DEPRECATED, "Constant %s is deprecated", name);
|
|
}
|
|
return &c->value;
|
|
}
|
|
|
|
static void* zend_hash_add_constant(HashTable *ht, zend_string *key, zend_constant *c)
|
|
{
|
|
void *ret;
|
|
zend_constant *copy = pemalloc(sizeof(zend_constant), ZEND_CONSTANT_FLAGS(c) & CONST_PERSISTENT);
|
|
|
|
memcpy(copy, c, sizeof(zend_constant));
|
|
ret = zend_hash_add_ptr(ht, key, copy);
|
|
if (!ret) {
|
|
pefree(copy, ZEND_CONSTANT_FLAGS(c) & CONST_PERSISTENT);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
ZEND_API zend_result zend_register_constant(zend_constant *c)
|
|
{
|
|
zend_string *lowercase_name = NULL;
|
|
zend_string *name;
|
|
zend_result ret = SUCCESS;
|
|
bool persistent = (ZEND_CONSTANT_FLAGS(c) & CONST_PERSISTENT) != 0;
|
|
|
|
#if 0
|
|
printf("Registering constant for module %d\n", c->module_number);
|
|
#endif
|
|
|
|
const char *slash = strrchr(ZSTR_VAL(c->name), '\\');
|
|
if (slash) {
|
|
lowercase_name = zend_string_init(ZSTR_VAL(c->name), ZSTR_LEN(c->name), 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 any special constant */
|
|
if (zend_string_equals_literal(name, "__COMPILER_HALT_OFFSET__")
|
|
|| (!persistent && zend_get_special_const(ZSTR_VAL(name), ZSTR_LEN(name)))
|
|
|| zend_hash_add_constant(EG(zend_constants), name, c) == NULL
|
|
) {
|
|
zend_error(E_WARNING, "Constant %s already defined", ZSTR_VAL(name));
|
|
zend_string_release(c->name);
|
|
if (!persistent) {
|
|
zval_ptr_dtor_nogc(&c->value);
|
|
}
|
|
ret = FAILURE;
|
|
}
|
|
if (lowercase_name) {
|
|
zend_string_release(lowercase_name);
|
|
}
|
|
return ret;
|
|
}
|