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zend_compile.c
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/*
+----------------------------------------------------------------------+
| Zend Engine |
+----------------------------------------------------------------------+
| Copyright (c) 1998-2015 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 |
| [email protected] so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
| Authors: Andi Gutmans <[email protected]> |
| Zeev Suraski <[email protected]> |
| Nikita Popov <[email protected]> |
+----------------------------------------------------------------------+
*/
/* $Id$ */
#include <zend_language_parser.h>
#include "zend.h"
#include "zend_compile.h"
#include "zend_constants.h"
#include "zend_llist.h"
#include "zend_API.h"
#include "zend_exceptions.h"
#include "zend_virtual_cwd.h"
#include "zend_multibyte.h"
#include "zend_language_scanner.h"
#include "zend_inheritance.h"
#define SET_NODE(target, src) do { \
target ## _type = (src)->op_type; \
if ((src)->op_type == IS_CONST) { \
target.constant = zend_add_literal(CG(active_op_array), &(src)->u.constant); \
} else { \
target = (src)->u.op; \
} \
} while (0)
#define GET_NODE(target, src) do { \
(target)->op_type = src ## _type; \
if ((target)->op_type == IS_CONST) { \
ZVAL_COPY_VALUE(&(target)->u.constant, CT_CONSTANT(src)); \
} else { \
(target)->u.op = src; \
} \
} while (0)
static inline void zend_alloc_cache_slot(uint32_t literal) {
zend_op_array *op_array = CG(active_op_array);
Z_CACHE_SLOT(op_array->literals[literal]) = op_array->last_cache_slot++;
}
#define POLYMORPHIC_CACHE_SLOT_SIZE 2
static inline void zend_alloc_polymorphic_cache_slot(uint32_t literal) {
zend_op_array *op_array = CG(active_op_array);
Z_CACHE_SLOT(op_array->literals[literal]) = op_array->last_cache_slot;
op_array->last_cache_slot += POLYMORPHIC_CACHE_SLOT_SIZE;
}
ZEND_API zend_op_array *(*zend_compile_file)(zend_file_handle *file_handle, int type);
ZEND_API zend_op_array *(*zend_compile_string)(zval *source_string, char *filename);
#ifndef ZTS
ZEND_API zend_compiler_globals compiler_globals;
ZEND_API zend_executor_globals executor_globals;
#endif
static void zend_destroy_property_info(zval *zv) /* {{{ */
{
zend_property_info *property_info = Z_PTR_P(zv);
zend_string_release(property_info->name);
if (property_info->doc_comment) {
zend_string_release(property_info->doc_comment);
}
}
/* }}} */
static void zend_destroy_property_info_internal(zval *zv) /* {{{ */
{
zend_property_info *property_info = Z_PTR_P(zv);
zend_string_release(property_info->name);
free(property_info);
}
/* }}} */
static zend_string *zend_new_interned_string_safe(zend_string *str) /* {{{ */ {
zend_string *interned_str;
zend_string_addref(str);
interned_str = zend_new_interned_string(str);
if (str != interned_str) {
return interned_str;
} else {
zend_string_release(str);
return str;
}
}
/* }}} */
static zend_string *zend_build_runtime_definition_key(zend_string *name, unsigned char *lex_pos) /* {{{ */
{
zend_string *result;
char char_pos_buf[32];
size_t filename_len, char_pos_len = zend_sprintf(char_pos_buf, "%p", lex_pos);
const char *filename;
if (CG(active_op_array)->filename) {
filename = CG(active_op_array)->filename->val;
filename_len = CG(active_op_array)->filename->len;
} else {
filename = "-";
filename_len = sizeof("-") - 1;
}
/* NULL, name length, filename length, last accepting char position length */
result = zend_string_alloc(1 + name->len + filename_len + char_pos_len, 0);
sprintf(result->val, "%c%s%s%s", '\0', name->val, filename, char_pos_buf);
return zend_new_interned_string(result);
}
/* }}} */
static zend_bool zend_get_unqualified_name(const zend_string *name, const char **result, size_t *result_len) /* {{{ */
{
const char *ns_separator = zend_memrchr(name->val, '\\', name->len);
if (ns_separator != NULL) {
*result = ns_separator + 1;
*result_len = name->val + name->len - *result;
return 1;
}
return 0;
}
/* }}} */
static void init_compiler_declarables(void) /* {{{ */
{
ZVAL_LONG(&CG(declarables).ticks, 0);
}
/* }}} */
void zend_init_compiler_context(void) /* {{{ */
{
CG(context).opcodes_size = INITIAL_OP_ARRAY_SIZE;
CG(context).vars_size = 0;
CG(context).literals_size = 0;
CG(context).current_brk_cont = -1;
CG(context).backpatch_count = 0;
CG(context).in_finally = 0;
CG(context).fast_call_var = -1;
CG(context).labels = NULL;
}
/* }}} */
void zend_init_compiler_data_structures(void) /* {{{ */
{
zend_stack_init(&CG(loop_var_stack), sizeof(znode));
zend_stack_init(&CG(delayed_oplines_stack), sizeof(zend_op));
CG(active_class_entry) = NULL;
CG(in_compilation) = 0;
CG(start_lineno) = 0;
CG(current_namespace) = NULL;
CG(in_namespace) = 0;
CG(has_bracketed_namespaces) = 0;
CG(current_import) = NULL;
CG(current_import_function) = NULL;
CG(current_import_const) = NULL;
zend_hash_init(&CG(const_filenames), 8, NULL, NULL, 0);
init_compiler_declarables();
zend_stack_init(&CG(context_stack), sizeof(CG(context)));
CG(encoding_declared) = 0;
}
/* }}} */
ZEND_API void file_handle_dtor(zend_file_handle *fh) /* {{{ */
{
zend_file_handle_dtor(fh);
}
/* }}} */
void init_compiler(void) /* {{{ */
{
CG(arena) = zend_arena_create(64 * 1024);
CG(active_op_array) = NULL;
memset(&CG(context), 0, sizeof(CG(context)));
zend_init_compiler_data_structures();
zend_init_rsrc_list();
zend_hash_init(&CG(filenames_table), 8, NULL, free_string_zval, 0);
zend_llist_init(&CG(open_files), sizeof(zend_file_handle), (void (*)(void *)) file_handle_dtor, 0);
CG(unclean_shutdown) = 0;
}
/* }}} */
void shutdown_compiler(void) /* {{{ */
{
zend_stack_destroy(&CG(loop_var_stack));
zend_stack_destroy(&CG(delayed_oplines_stack));
zend_hash_destroy(&CG(filenames_table));
zend_hash_destroy(&CG(const_filenames));
zend_stack_destroy(&CG(context_stack));
zend_arena_destroy(CG(arena));
}
/* }}} */
ZEND_API zend_string *zend_set_compiled_filename(zend_string *new_compiled_filename) /* {{{ */
{
zend_string *p;
p = zend_hash_find_ptr(&CG(filenames_table), new_compiled_filename);
if (p != NULL) {
CG(compiled_filename) = p;
return p;
}
p = zend_string_copy(new_compiled_filename);
zend_hash_update_ptr(&CG(filenames_table), new_compiled_filename, p);
CG(compiled_filename) = p;
return p;
}
/* }}} */
ZEND_API void zend_restore_compiled_filename(zend_string *original_compiled_filename) /* {{{ */
{
CG(compiled_filename) = original_compiled_filename;
}
/* }}} */
ZEND_API zend_string *zend_get_compiled_filename(void) /* {{{ */
{
return CG(compiled_filename);
}
/* }}} */
ZEND_API int zend_get_compiled_lineno(void) /* {{{ */
{
return CG(zend_lineno);
}
/* }}} */
ZEND_API zend_bool zend_is_compiling(void) /* {{{ */
{
return CG(in_compilation);
}
/* }}} */
static uint32_t get_temporary_variable(zend_op_array *op_array) /* {{{ */
{
return (uint32_t)op_array->T++;
}
/* }}} */
static int lookup_cv(zend_op_array *op_array, zend_string* name) /* {{{ */{
int i = 0;
zend_ulong hash_value = zend_string_hash_val(name);
while (i < op_array->last_var) {
if (op_array->vars[i]->val == name->val ||
(op_array->vars[i]->h == hash_value &&
op_array->vars[i]->len == name->len &&
memcmp(op_array->vars[i]->val, name->val, name->len) == 0)) {
zend_string_release(name);
return (int)(zend_intptr_t)ZEND_CALL_VAR_NUM(NULL, i);
}
i++;
}
i = op_array->last_var;
op_array->last_var++;
if (op_array->last_var > CG(context).vars_size) {
CG(context).vars_size += 16; /* FIXME */
op_array->vars = erealloc(op_array->vars, CG(context).vars_size * sizeof(zend_string*));
}
op_array->vars[i] = zend_new_interned_string(name);
return (int)(zend_intptr_t)ZEND_CALL_VAR_NUM(NULL, i);
}
/* }}} */
void zend_del_literal(zend_op_array *op_array, int n) /* {{{ */
{
zval_dtor(CT_CONSTANT_EX(op_array, n));
if (n + 1 == op_array->last_literal) {
op_array->last_literal--;
} else {
ZVAL_UNDEF(CT_CONSTANT_EX(op_array, n));
}
}
/* }}} */
/* Common part of zend_add_literal and zend_append_individual_literal */
static inline void zend_insert_literal(zend_op_array *op_array, zval *zv, int literal_position) /* {{{ */
{
if (Z_TYPE_P(zv) == IS_STRING || Z_TYPE_P(zv) == IS_CONSTANT) {
zend_string_hash_val(Z_STR_P(zv));
Z_STR_P(zv) = zend_new_interned_string(Z_STR_P(zv));
if (IS_INTERNED(Z_STR_P(zv))) {
Z_TYPE_FLAGS_P(zv) &= ~ (IS_TYPE_REFCOUNTED | IS_TYPE_COPYABLE);
}
}
ZVAL_COPY_VALUE(CT_CONSTANT_EX(op_array, literal_position), zv);
Z_CACHE_SLOT(op_array->literals[literal_position]) = -1;
}
/* }}} */
/* Is used while compiling a function, using the context to keep track
of an approximate size to avoid to relocate to often.
Literals are truncated to actual size in the second compiler pass (pass_two()). */
int zend_add_literal(zend_op_array *op_array, zval *zv) /* {{{ */
{
int i = op_array->last_literal;
op_array->last_literal++;
if (i >= CG(context).literals_size) {
while (i >= CG(context).literals_size) {
CG(context).literals_size += 16; /* FIXME */
}
op_array->literals = (zval*)erealloc(op_array->literals, CG(context).literals_size * sizeof(zval));
}
zend_insert_literal(op_array, zv, i);
return i;
}
/* }}} */
static inline int zend_add_literal_string(zend_op_array *op_array, zend_string **str) /* {{{ */
{
int ret;
zval zv;
ZVAL_STR(&zv, *str);
ret = zend_add_literal(op_array, &zv);
*str = Z_STR(zv);
return ret;
}
/* }}} */
static int zend_add_func_name_literal(zend_op_array *op_array, zend_string *name) /* {{{ */
{
/* Original name */
int ret = zend_add_literal_string(op_array, &name);
/* Lowercased name */
zend_string *lc_name = zend_string_tolower(name);
zend_add_literal_string(op_array, &lc_name);
return ret;
}
/* }}} */
static int zend_add_ns_func_name_literal(zend_op_array *op_array, zend_string *name) /* {{{ */
{
const char *unqualified_name;
size_t unqualified_name_len;
/* Original name */
int ret = zend_add_literal_string(op_array, &name);
/* Lowercased name */
zend_string *lc_name = zend_string_tolower(name);
zend_add_literal_string(op_array, &lc_name);
/* Lowercased unqualfied name */
if (zend_get_unqualified_name(name, &unqualified_name, &unqualified_name_len)) {
lc_name = zend_string_alloc(unqualified_name_len, 0);
zend_str_tolower_copy(lc_name->val, unqualified_name, unqualified_name_len);
zend_add_literal_string(op_array, &lc_name);
}
return ret;
}
/* }}} */
static int zend_add_class_name_literal(zend_op_array *op_array, zend_string *name) /* {{{ */
{
/* Original name */
int ret = zend_add_literal_string(op_array, &name);
/* Lowercased name */
zend_string *lc_name = zend_string_tolower(name);
zend_add_literal_string(op_array, &lc_name);
zend_alloc_cache_slot(ret);
return ret;
}
/* }}} */
static int zend_add_const_name_literal(zend_op_array *op_array, zend_string *name, zend_bool unqualified) /* {{{ */
{
zend_string *tmp_name;
int ret = zend_add_literal_string(op_array, &name);
size_t ns_len = 0, after_ns_len = name->len;
const char *after_ns = zend_memrchr(name->val, '\\', name->len);
if (after_ns) {
after_ns += 1;
ns_len = after_ns - name->val - 1;
after_ns_len = name->len - ns_len - 1;
/* lowercased namespace name & original constant name */
tmp_name = zend_string_init(name->val, name->len, 0);
zend_str_tolower(tmp_name->val, ns_len);
zend_add_literal_string(op_array, &tmp_name);
/* lowercased namespace name & lowercased constant name */
tmp_name = zend_string_tolower(name);
zend_add_literal_string(op_array, &tmp_name);
if (!unqualified) {
return ret;
}
} else {
after_ns = name->val;
}
/* original unqualified constant name */
tmp_name = zend_string_init(after_ns, after_ns_len, 0);
zend_add_literal_string(op_array, &tmp_name);
/* lowercased unqualified constant name */
tmp_name = zend_string_alloc(after_ns_len, 0);
zend_str_tolower_copy(tmp_name->val, after_ns, after_ns_len);
zend_add_literal_string(op_array, &tmp_name);
return ret;
}
/* }}} */
#define LITERAL_STR(op, str) do { \
zval _c; \
ZVAL_STR(&_c, str); \
op.constant = zend_add_literal(CG(active_op_array), &_c); \
} while (0)
#define MAKE_NOP(opline) do { \
opline->opcode = ZEND_NOP; \
memset(&opline->result, 0, sizeof(opline->result)); \
memset(&opline->op1, 0, sizeof(opline->op1)); \
memset(&opline->op2, 0, sizeof(opline->op2)); \
opline->result_type = opline->op1_type = opline->op2_type = IS_UNUSED; \
} while (0)
void zend_stop_lexing(void) {
LANG_SCNG(yy_cursor) = LANG_SCNG(yy_limit);
}
static inline void zend_begin_loop(void) /* {{{ */
{
zend_brk_cont_element *brk_cont_element;
int parent;
parent = CG(context).current_brk_cont;
CG(context).current_brk_cont = CG(active_op_array)->last_brk_cont;
brk_cont_element = get_next_brk_cont_element(CG(active_op_array));
brk_cont_element->start = get_next_op_number(CG(active_op_array));
brk_cont_element->parent = parent;
}
/* }}} */
static inline void zend_end_loop(int cont_addr, int has_loop_var) /* {{{ */
{
if (!has_loop_var) {
/* The start fileld is used to free temporary variables in case of exceptions.
* We won't try to free something of we don't have loop variable.
*/
CG(active_op_array)->brk_cont_array[CG(context).current_brk_cont].start = -1;
}
CG(active_op_array)->brk_cont_array[CG(context).current_brk_cont].cont = cont_addr;
CG(active_op_array)->brk_cont_array[CG(context).current_brk_cont].brk = get_next_op_number(CG(active_op_array));
CG(context).current_brk_cont = CG(active_op_array)->brk_cont_array[CG(context).current_brk_cont].parent;
}
/* }}} */
void zend_do_free(znode *op1) /* {{{ */
{
if (op1->op_type==IS_TMP_VAR) {
zend_op *opline = get_next_op(CG(active_op_array));
opline->opcode = ZEND_FREE;
SET_NODE(opline->op1, op1);
SET_UNUSED(opline->op2);
} else if (op1->op_type==IS_VAR) {
zend_op *opline = &CG(active_op_array)->opcodes[CG(active_op_array)->last-1];
while (opline->opcode == ZEND_END_SILENCE || opline->opcode == ZEND_EXT_FCALL_END || opline->opcode == ZEND_OP_DATA) {
opline--;
}
if (opline->result_type == IS_VAR
&& opline->result.var == op1->u.op.var) {
if (opline->opcode == ZEND_FETCH_R ||
opline->opcode == ZEND_FETCH_DIM_R ||
opline->opcode == ZEND_FETCH_OBJ_R) {
/* It's very rare and useless case. It's better to use
additional FREE opcode and simplify the FETCH handlers
their selves */
opline = get_next_op(CG(active_op_array));
opline->opcode = ZEND_FREE;
SET_NODE(opline->op1, op1);
SET_UNUSED(opline->op2);
} else {
opline->result_type |= EXT_TYPE_UNUSED;
}
} else {
while (opline >= CG(active_op_array)->opcodes) {
if (opline->opcode == ZEND_FETCH_LIST &&
opline->op1_type == IS_VAR &&
opline->op1.var == op1->u.op.var) {
opline = get_next_op(CG(active_op_array));
opline->opcode = ZEND_FREE;
SET_NODE(opline->op1, op1);
SET_UNUSED(opline->op2);
return;
}
if (opline->result_type==IS_VAR
&& opline->result.var == op1->u.op.var) {
if (opline->opcode == ZEND_NEW) {
opline->result_type |= EXT_TYPE_UNUSED;
opline = &CG(active_op_array)->opcodes[CG(active_op_array)->last-1];
while (opline->opcode != ZEND_DO_FCALL || opline->op1.num != ZEND_CALL_CTOR) {
opline--;
}
opline->op1.num |= ZEND_CALL_CTOR_RESULT_UNUSED;
}
break;
}
opline--;
}
}
} else if (op1->op_type == IS_CONST) {
/* Destroy value without using GC: When opcache moves arrays into SHM it will
* free the zend_array structure, so references to it from outside the op array
* become invalid. GC would cause such a reference in the root buffer. */
zval_ptr_dtor_nogc(&op1->u.constant);
}
}
/* }}} */
uint32_t zend_add_class_modifier(uint32_t flags, uint32_t new_flag) /* {{{ */
{
uint32_t new_flags = flags | new_flag;
if ((flags & ZEND_ACC_EXPLICIT_ABSTRACT_CLASS) && (new_flag & ZEND_ACC_EXPLICIT_ABSTRACT_CLASS)) {
zend_error_noreturn(E_COMPILE_ERROR, "Multiple abstract modifiers are not allowed");
}
if ((flags & ZEND_ACC_FINAL) && (new_flag & ZEND_ACC_FINAL)) {
zend_error_noreturn(E_COMPILE_ERROR, "Multiple final modifiers are not allowed");
}
if ((new_flags & ZEND_ACC_EXPLICIT_ABSTRACT_CLASS) && (new_flags & ZEND_ACC_FINAL)) {
zend_error_noreturn(E_COMPILE_ERROR, "Cannot use the final modifier on an abstract class");
}
return new_flags;
}
/* }}} */
uint32_t zend_add_member_modifier(uint32_t flags, uint32_t new_flag) /* {{{ */
{
uint32_t new_flags = flags | new_flag;
if ((flags & ZEND_ACC_PPP_MASK) && (new_flag & ZEND_ACC_PPP_MASK)) {
zend_error_noreturn(E_COMPILE_ERROR, "Multiple access type modifiers are not allowed");
}
if ((flags & ZEND_ACC_ABSTRACT) && (new_flag & ZEND_ACC_ABSTRACT)) {
zend_error_noreturn(E_COMPILE_ERROR, "Multiple abstract modifiers are not allowed");
}
if ((flags & ZEND_ACC_STATIC) && (new_flag & ZEND_ACC_STATIC)) {
zend_error_noreturn(E_COMPILE_ERROR, "Multiple static modifiers are not allowed");
}
if ((flags & ZEND_ACC_FINAL) && (new_flag & ZEND_ACC_FINAL)) {
zend_error_noreturn(E_COMPILE_ERROR, "Multiple final modifiers are not allowed");
}
if ((new_flags & ZEND_ACC_ABSTRACT) && (new_flags & ZEND_ACC_FINAL)) {
zend_error_noreturn(E_COMPILE_ERROR, "Cannot use the final modifier on an abstract class member");
}
return new_flags;
}
/* }}} */
zend_string *zend_concat3(char *str1, size_t str1_len, char *str2, size_t str2_len, char *str3, size_t str3_len) /* {{{ */
{
size_t len = str1_len + str2_len + str3_len;
zend_string *res = zend_string_alloc(len, 0);
memcpy(res->val, str1, str1_len);
memcpy(res->val + str1_len, str2, str2_len);
memcpy(res->val + str1_len + str2_len, str3, str3_len);
res->val[len] = '\0';
return res;
}
zend_string *zend_concat_names(char *name1, size_t name1_len, char *name2, size_t name2_len) {
return zend_concat3(name1, name1_len, "\\", 1, name2, name2_len);
}
zend_string *zend_prefix_with_ns(zend_string *name) {
if (CG(current_namespace)) {
zend_string *ns = CG(current_namespace);
return zend_concat_names(ns->val, ns->len, name->val, name->len);
} else {
return zend_string_copy(name);
}
}
void *zend_hash_find_ptr_lc(HashTable *ht, const char *str, size_t len) {
void *result;
zend_string *lcname;
ALLOCA_FLAG(use_heap);
STR_ALLOCA_ALLOC(lcname, len, use_heap);
zend_str_tolower_copy(lcname->val, str, len);
result = zend_hash_find_ptr(ht, lcname);
STR_ALLOCA_FREE(lcname, use_heap);
return result;
}
zend_string *zend_resolve_non_class_name(
zend_string *name, uint32_t type, zend_bool *is_fully_qualified,
zend_bool case_sensitive, HashTable *current_import_sub
) {
char *compound;
*is_fully_qualified = 0;
if (name->val[0] == '\\') {
/* Remove \ prefix (only relevant if this is a string rather than a label) */
return zend_string_init(name->val + 1, name->len - 1, 0);
}
if (type == ZEND_NAME_FQ) {
*is_fully_qualified = 1;
return zend_string_copy(name);
}
if (type == ZEND_NAME_RELATIVE) {
*is_fully_qualified = 1;
return zend_prefix_with_ns(name);
}
if (current_import_sub) {
/* If an unqualified name is a function/const alias, replace it. */
zend_string *import_name;
if (case_sensitive) {
import_name = zend_hash_find_ptr(current_import_sub, name);
} else {
import_name = zend_hash_find_ptr_lc(current_import_sub, name->val, name->len);
}
if (import_name) {
*is_fully_qualified = 1;
return zend_string_copy(import_name);
}
}
compound = memchr(name->val, '\\', name->len);
if (compound) {
*is_fully_qualified = 1;
}
if (compound && CG(current_import)) {
/* If the first part of a qualified name is an alias, substitute it. */
size_t len = compound - name->val;
zend_string *import_name = zend_hash_find_ptr_lc(CG(current_import), name->val, len);
if (import_name) {
return zend_concat_names(
import_name->val, import_name->len, name->val + len + 1, name->len - len - 1);
}
}
return zend_prefix_with_ns(name);
}
/* }}} */
zend_string *zend_resolve_function_name(zend_string *name, uint32_t type, zend_bool *is_fully_qualified) /* {{{ */
{
return zend_resolve_non_class_name(
name, type, is_fully_qualified, 0, CG(current_import_function));
}
/* }}} */
zend_string *zend_resolve_const_name(zend_string *name, uint32_t type, zend_bool *is_fully_qualified) /* {{{ */ {
return zend_resolve_non_class_name(
name, type, is_fully_qualified, 1, CG(current_import_const));
}
/* }}} */
zend_string *zend_resolve_class_name(zend_string *name, uint32_t type) /* {{{ */
{
char *compound;
if (type == ZEND_NAME_RELATIVE) {
return zend_prefix_with_ns(name);
}
if (type == ZEND_NAME_FQ || name->val[0] == '\\') {
/* Remove \ prefix (only relevant if this is a string rather than a label) */
if (name->val[0] == '\\') {
name = zend_string_init(name->val + 1, name->len - 1, 0);
} else {
zend_string_addref(name);
}
/* Ensure that \self, \parent and \static are not used */
if (ZEND_FETCH_CLASS_DEFAULT != zend_get_class_fetch_type(name)) {
zend_error_noreturn(E_COMPILE_ERROR, "'\\%s' is an invalid class name", name->val);
}
return name;
}
if (CG(current_import)) {
compound = memchr(name->val, '\\', name->len);
if (compound) {
/* If the first part of a qualified name is an alias, substitute it. */
size_t len = compound - name->val;
zend_string *import_name = zend_hash_find_ptr_lc(CG(current_import), name->val, len);
if (import_name) {
return zend_concat_names(
import_name->val, import_name->len, name->val + len + 1, name->len - len - 1);
}
} else {
/* If an unqualified name is an alias, replace it. */
zend_string *import_name
= zend_hash_find_ptr_lc(CG(current_import), name->val, name->len);
if (import_name) {
return zend_string_copy(import_name);
}
}
}
/* If not fully qualified and not an alias, prepend the current namespace */
return zend_prefix_with_ns(name);
}
/* }}} */
zend_string *zend_resolve_class_name_ast(zend_ast *ast) /* {{{ */
{
zend_string *name = zend_ast_get_str(ast);
return zend_resolve_class_name(name, ast->attr);
}
/* }}} */
static void ptr_dtor(zval *zv) /* {{{ */
{
efree(Z_PTR_P(zv));
}
/* }}} */
static void str_dtor(zval *zv) /* {{{ */ {
zend_string_release(Z_STR_P(zv));
}
/* }}} */
void zend_resolve_goto_label(zend_op_array *op_array, zend_op *opline, int pass2) /* {{{ */
{
zend_label *dest;
int current, distance;
zval *label;
if (pass2) {
label = RT_CONSTANT(op_array, opline->op2);
} else {
label = CT_CONSTANT_EX(op_array, opline->op2.constant);
}
if (CG(context).labels == NULL ||
(dest = zend_hash_find_ptr(CG(context).labels, Z_STR_P(label))) == NULL) {
if (pass2) {
CG(in_compilation) = 1;
CG(active_op_array) = op_array;
CG(zend_lineno) = opline->lineno;
zend_error_noreturn(E_COMPILE_ERROR, "'goto' to undefined label '%s'", Z_STRVAL_P(label));
} else {
/* Label is not defined. Delay to pass 2. */
return;
}
}
opline->op1.opline_num = dest->opline_num;
zval_dtor(label);
ZVAL_NULL(label);
/* Check that we are not moving into loop or switch */
current = opline->extended_value;
for (distance = 0; current != dest->brk_cont; distance++) {
if (current == -1) {
if (pass2) {
CG(in_compilation) = 1;
CG(active_op_array) = op_array;
CG(zend_lineno) = opline->lineno;
}
zend_error_noreturn(E_COMPILE_ERROR, "'goto' into loop or switch statement is disallowed");
}
current = op_array->brk_cont_array[current].parent;
}
if (distance == 0) {
/* Nothing to break out of, optimize to ZEND_JMP */
opline->opcode = ZEND_JMP;
opline->extended_value = 0;
SET_UNUSED(opline->op2);
} else {
/* Set real break distance */
ZVAL_LONG(label, distance);
}
}
/* }}} */
void zend_release_labels(int temporary) /* {{{ */
{
if (CG(context).labels) {
zend_hash_destroy(CG(context).labels);
FREE_HASHTABLE(CG(context).labels);
CG(context).labels = NULL;
}
if (!temporary && !zend_stack_is_empty(&CG(context_stack))) {
zend_compiler_context *ctx = zend_stack_top(&CG(context_stack));
CG(context) = *ctx;
zend_stack_del_top(&CG(context_stack));
}
}
/* }}} */
static zend_bool zend_is_call(zend_ast *ast);
static int generate_free_loop_var(znode *var) /* {{{ */
{
switch (var->op_type) {
case IS_UNUSED:
/* Stack separator on function boundary, stop applying */
return 1;
case IS_VAR:
case IS_TMP_VAR:
{
zend_op *opline = get_next_op(CG(active_op_array));
opline->opcode = ZEND_FREE;
SET_NODE(opline->op1, var);
SET_UNUSED(opline->op2);
}
}
return 0;
}
/* }}} */
static uint32_t zend_add_try_element(uint32_t try_op) /* {{{ */
{
zend_op_array *op_array = CG(active_op_array);
uint32_t try_catch_offset = op_array->last_try_catch++;
zend_try_catch_element *elem;
op_array->try_catch_array = safe_erealloc(
op_array->try_catch_array, sizeof(zend_try_catch_element), op_array->last_try_catch, 0);
elem = &op_array->try_catch_array[try_catch_offset];
elem->try_op = try_op;
elem->catch_op = 0;
elem->finally_op = 0;
elem->finally_end = 0;
return try_catch_offset;
}
/* }}} */
ZEND_API void function_add_ref(zend_function *function) /* {{{ */
{
if (function->type == ZEND_USER_FUNCTION) {
zend_op_array *op_array = &function->op_array;
(*op_array->refcount)++;
if (op_array->static_variables) {
HashTable *static_variables = op_array->static_variables;
ALLOC_HASHTABLE(op_array->static_variables);
zend_array_dup(op_array->static_variables, static_variables);
}
op_array->run_time_cache = NULL;
} else if (function->type == ZEND_INTERNAL_FUNCTION) {
if (function->common.function_name) {
zend_string_addref(function->common.function_name);
}
}
}
/* }}} */
ZEND_API int do_bind_function(const zend_op_array *op_array, const zend_op *opline, HashTable *function_table, zend_bool compile_time) /* {{{ */
{
zend_function *function, *new_function;
zval *op1, *op2;
if (compile_time) {
op1 = CT_CONSTANT_EX(op_array, opline->op1.constant);
op2 = CT_CONSTANT_EX(op_array, opline->op2.constant);
} else {
op1 = RT_CONSTANT(op_array, opline->op1);
op2 = RT_CONSTANT(op_array, opline->op2);
}
function = zend_hash_find_ptr(function_table, Z_STR_P(op1));
new_function = zend_arena_alloc(&CG(arena), sizeof(zend_op_array));
memcpy(new_function, function, sizeof(zend_op_array));
if (zend_hash_add_ptr(function_table, Z_STR_P(op2), new_function) == NULL) {
int error_level = compile_time ? E_COMPILE_ERROR : E_ERROR;
zend_function *old_function;
efree_size(new_function, sizeof(zend_op_array));
if ((old_function = zend_hash_find_ptr(function_table, Z_STR_P(op2))) != NULL
&& old_function->type == ZEND_USER_FUNCTION
&& old_function->op_array.last > 0) {
zend_error(error_level, "Cannot redeclare %s() (previously declared in %s:%d)",
function->common.function_name->val,
old_function->op_array.filename->val,
old_function->op_array.opcodes[0].lineno);
} else {
zend_error(error_level, "Cannot redeclare %s()", function->common.function_name->val);
}
return FAILURE;
} else {
(*function->op_array.refcount)++;
function->op_array.static_variables = NULL; /* NULL out the unbound function */
return SUCCESS;
}
}
/* }}} */
ZEND_API zend_class_entry *do_bind_class(const zend_op_array* op_array, const zend_op *opline, HashTable *class_table, zend_bool compile_time) /* {{{ */
{
zend_class_entry *ce;
zval *op1, *op2;
if (compile_time) {
op1 = CT_CONSTANT_EX(op_array, opline->op1.constant);
op2 = CT_CONSTANT_EX(op_array, opline->op2.constant);
} else {
op1 = RT_CONSTANT(op_array, opline->op1);
op2 = RT_CONSTANT(op_array, opline->op2);
}
if ((ce = zend_hash_find_ptr(class_table, Z_STR_P(op1))) == NULL) {
zend_error_noreturn(E_COMPILE_ERROR, "Internal Zend error - Missing class information for %s", Z_STRVAL_P(op1));
return NULL;
}
ce->refcount++;
if (zend_hash_add_ptr(class_table, Z_STR_P(op2), ce) == NULL) {
ce->refcount--;
if (!compile_time) {
/* If we're in compile time, in practice, it's quite possible
* that we'll never reach this class declaration at runtime,
* so we shut up about it. This allows the if (!defined('FOO')) { return; }
* approach to work.
*/
zend_error_noreturn(E_COMPILE_ERROR, "Cannot redeclare class %s", ce->name->val);
}
return NULL;
} else {
if (!(ce->ce_flags & (ZEND_ACC_INTERFACE|ZEND_ACC_IMPLEMENT_INTERFACES|ZEND_ACC_IMPLEMENT_TRAITS))) {
zend_verify_abstract_class(ce);
}
return ce;
}
}
/* }}} */
ZEND_API zend_class_entry *do_bind_inherited_class(const zend_op_array *op_array, const zend_op *opline, HashTable *class_table, zend_class_entry *parent_ce, zend_bool compile_time) /* {{{ */
{
zend_class_entry *ce;
zval *op1, *op2;
if (compile_time) {
op1 = CT_CONSTANT_EX(op_array, opline->op1.constant);
op2 = CT_CONSTANT_EX(op_array, opline->op2.constant);
} else {
op1 = RT_CONSTANT(op_array, opline->op1);
op2 = RT_CONSTANT(op_array, opline->op2);
}
ce = zend_hash_find_ptr(class_table, Z_STR_P(op1));
if (!ce) {
if (!compile_time) {
/* If we're in compile time, in practice, it's quite possible
* that we'll never reach this class declaration at runtime,
* so we shut up about it. This allows the if (!defined('FOO')) { return; }
* approach to work.
*/
zend_error_noreturn(E_COMPILE_ERROR, "Cannot redeclare class %s", Z_STRVAL_P(op2));
}
return NULL;
}
if (parent_ce->ce_flags & ZEND_ACC_INTERFACE) {
zend_error_noreturn(E_COMPILE_ERROR, "Class %s cannot extend from interface %s", ce->name->val, parent_ce->name->val);
} else if ((parent_ce->ce_flags & ZEND_ACC_TRAIT) == ZEND_ACC_TRAIT) {
zend_error_noreturn(E_COMPILE_ERROR, "Class %s cannot extend from trait %s", ce->name->val, parent_ce->name->val);
}
zend_do_inheritance(ce, parent_ce);