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2022-10-31 11:36
LICENSE
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Makefile.frag
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README.md
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Zend.m4
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bench.php
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micro_bench.php
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zend.c
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zend_extensions.c
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zend_float.c
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zend_gc.c
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zend_generators.h
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zend_globals.h
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zend_globals_macros.h
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zend_hash.c
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zend_inheritance.c
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zend_inheritance.h
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zend_ini.c
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zend_interfaces.c
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zend_iterators.c
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zend_llist.h
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zend_sort.c
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zend_ts_hash.c
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zend_ts_hash.h
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zend_types.h
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zend_variables.c
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zend_variables.h
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/* +----------------------------------------------------------------------+ | Zend Engine | +----------------------------------------------------------------------+ | Copyright (c) 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@php.net> | | Zeev Suraski <zeev@php.net> | +----------------------------------------------------------------------+ */ #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" /* Protection from recursive self-referencing class constants */ #define IS_CONSTANT_VISITED_MARK 0x80 #define IS_CONSTANT_VISITED(zv) (Z_ACCESS_FLAGS_P(zv) & IS_CONSTANT_VISITED_MARK) #define MARK_CONSTANT_VISITED(zv) Z_ACCESS_FLAGS_P(zv) |= IS_CONSTANT_VISITED_MARK #define RESET_CONSTANT_VISITED(zv) Z_ACCESS_FLAGS_P(zv) &= ~IS_CONSTANT_VISITED_MARK void free_zend_constant(zval *zv) { zend_constant *c = Z_PTR_P(zv); if (!(ZEND_CONSTANT_FLAGS(c) & CONST_PERSISTENT)) { zval_ptr_dtor_nogc(&c->value); if (c->name) { zend_string_release_ex(c->name, 0); } efree(c); } else { zval_internal_ptr_dtor(&c->value); if (c->name) { zend_string_release_ex(c->name, 1); } free(c); } } #ifdef ZTS static void copy_zend_constant(zval *zv) { zend_constant *c = Z_PTR_P(zv); ZEND_ASSERT(ZEND_CONSTANT_FLAGS(c) & CONST_PERSISTENT); Z_PTR_P(zv) = pemalloc(sizeof(zend_constant), 1); memcpy(Z_PTR_P(zv), c, sizeof(zend_constant)); c = Z_PTR_P(zv); c->name = zend_string_copy(c->name); 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); } #endif static int clean_module_constant(zval *el, void *arg) { zend_constant *c = (zend_constant *)Z_PTR_P(el); int module_number = *(int *)arg; if (ZEND_CONSTANT_MODULE_NUMBER(c) == module_number) { return ZEND_HASH_APPLY_REMOVE; } else { return ZEND_HASH_APPLY_KEEP; } } 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); ZEND_CONSTANT_SET_FLAGS(&c, flags, module_number); c.name = zend_string_init_interned(name, name_len, flags & CONST_PERSISTENT); 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); ZEND_CONSTANT_SET_FLAGS(&c, flags, module_number); c.name = zend_string_init_interned(name, name_len, flags & CONST_PERSISTENT); 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); ZEND_CONSTANT_SET_FLAGS(&c, flags, module_number); c.name = zend_string_init_interned(name, name_len, flags & CONST_PERSISTENT); 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); ZEND_CONSTANT_SET_FLAGS(&c, flags, module_number); c.name = zend_string_init_interned(name, name_len, flags & CONST_PERSISTENT); 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_STR(&c.value, zend_string_init_interned(strval, strlen, flags & CONST_PERSISTENT)); ZEND_CONSTANT_SET_FLAGS(&c, flags, module_number); c.name = zend_string_init_interned(name, name_len, flags & CONST_PERSISTENT); 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 const 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_efree(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); } } /* }}} */ static inline zend_constant *zend_get_constant_str_impl(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 (ZEND_CONSTANT_FLAGS(c) & CONST_CS) { c = NULL; } } else { c = zend_get_special_constant(name, name_len); } free_alloca(lcname, use_heap); } return c; } ZEND_API zval *zend_get_constant_str(const char *name, size_t name_len) { zend_constant *c = zend_get_constant_str_impl(name, name_len); return c ? &c->value : NULL; } static inline zend_constant *zend_get_constant_impl(zend_string *name) { zval *zv; zend_constant *c; ALLOCA_FLAG(use_heap) zv = zend_hash_find(EG(zend_constants), name); if (zv == NULL) { char *lcname = do_alloca(ZSTR_LEN(name) + 1, use_heap); zend_str_tolower_copy(lcname, ZSTR_VAL(name), ZSTR_LEN(name)); zv = zend_hash_str_find(EG(zend_constants), lcname, ZSTR_LEN(name)); if (zv != NULL) { c = Z_PTR_P(zv); if (ZEND_CONSTANT_FLAGS(c) & CONST_CS) { c = NULL; } } else { c = zend_get_special_constant(ZSTR_VAL(name), ZSTR_LEN(name)); } free_alloca(lcname, use_heap); return c; } else { return (zend_constant *) Z_PTR_P(zv); } } ZEND_API zval *zend_get_constant(zend_string *name) { zend_constant *c = zend_get_constant_impl(name); return c ? &c->value : NULL; } static zend_bool is_access_deprecated(const zend_constant *c, const char *access_name) { const char *ns_sep = zend_memrchr(ZSTR_VAL(c->name), '\\', ZSTR_LEN(c->name)); if (ns_sep) { /* Namespaces are always case-insensitive. Only compare shortname. */ size_t shortname_offset = ns_sep - ZSTR_VAL(c->name) + 1; size_t shortname_len = ZSTR_LEN(c->name) - shortname_offset; return memcmp( access_name + shortname_offset, ZSTR_VAL(c->name) + shortname_offset, shortname_len ) != 0; } else { /* No namespace, compare whole name */ return memcmp(access_name, ZSTR_VAL(c->name), ZSTR_LEN(c->name)) != 0; } } 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)) { if ((flags & ZEND_FETCH_CLASS_SILENT) == 0) { 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) { int 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) 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 ((ZEND_CONSTANT_FLAGS(c) & CONST_CS) != 0) { c = NULL; } } } free_alloca(lcname, use_heap); if (!c) { if (!(flags & IS_CONSTANT_UNQUALIFIED)) { return NULL; } /* name requires runtime resolution, need to check non-namespaced name */ c = zend_get_constant_str_impl(constant_name, const_name_len); name = constant_name; } } else { if (cname) { c = zend_get_constant_impl(cname); } else { c = zend_get_constant_str_impl(name, name_len); } } if (!c) { return NULL; } if (!(flags & ZEND_GET_CONSTANT_NO_DEPRECATION_CHECK)) { if (!(ZEND_CONSTANT_FLAGS(c) & (CONST_CS|CONST_CT_SUBST)) && is_access_deprecated(c, name)) { zend_error(E_DEPRECATED, "Case-insensitive constants are deprecated. " "The correct casing for this constant is \"%s\"", ZSTR_VAL(c->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 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 (!(ZEND_CONSTANT_FLAGS(c) & CONST_CS)) { lowercase_name = zend_string_tolower_ex(c->name, ZEND_CONSTANT_FLAGS(c) & CONST_PERSISTENT); 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), ZEND_CONSTANT_FLAGS(c) & 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 (zend_string_equals_literal(name, "__COMPILER_HALT_OFFSET__") || 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 (!(ZEND_CONSTANT_FLAGS(c) & CONST_PERSISTENT)) { zval_ptr_dtor_nogc(&c->value); } ret = FAILURE; } if (lowercase_name) { zend_string_release(lowercase_name); } return ret; }