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zend_compile.c
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/*
+----------------------------------------------------------------------+
| Zend Engine |
+----------------------------------------------------------------------+
| Copyright (c) 1998-2016 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_interfaces.h"
#include "zend_virtual_cwd.h"
#include "zend_multibyte.h"
#include "zend_language_scanner.h"
#include "zend_inheritance.h"
#include "zend_vm.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)
#define FC(member) (CG(file_context).member)
typedef struct _zend_loop_var {
zend_uchar opcode;
zend_uchar var_type;
uint32_t var_num;
union {
uint32_t try_catch_offset;
uint32_t live_range_offset;
} u;
} zend_loop_var;
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->cache_size;
op_array->cache_size += sizeof(void*);
}
#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->cache_size;
op_array->cache_size += POLYMORPHIC_CACHE_SLOT_SIZE * sizeof(void*);
}
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 zend_op *zend_emit_op(znode *result, zend_uchar opcode, znode *op1, znode *op2);
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 void zend_destroy_class_constant_internal(zval *zv) /* {{{ */
{
free(Z_PTR_P(zv));
}
/* }}} */
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 char_pos_len = zend_sprintf(char_pos_buf, "%p", lex_pos);
zend_string *filename = CG(active_op_array)->filename;
/* NULL, name length, filename length, last accepting char position length */
result = zend_string_alloc(1 + ZSTR_LEN(name) + ZSTR_LEN(filename) + char_pos_len, 0);
sprintf(ZSTR_VAL(result), "%c%s%s%s", '\0', ZSTR_VAL(name), ZSTR_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(ZSTR_VAL(name), '\\', ZSTR_LEN(name));
if (ns_separator != NULL) {
*result = ns_separator + 1;
*result_len = ZSTR_VAL(name) + ZSTR_LEN(name) - *result;
return 1;
}
return 0;
}
/* }}} */
struct reserved_class_name {
const char *name;
size_t len;
};
static const struct reserved_class_name reserved_class_names[] = {
{ZEND_STRL("bool")},
{ZEND_STRL("false")},
{ZEND_STRL("float")},
{ZEND_STRL("int")},
{ZEND_STRL("null")},
{ZEND_STRL("parent")},
{ZEND_STRL("self")},
{ZEND_STRL("static")},
{ZEND_STRL("string")},
{ZEND_STRL("true")},
{ZEND_STRL("void")},
{ZEND_STRL("iterable")},
{NULL, 0}
};
static zend_bool zend_is_reserved_class_name(const zend_string *name) /* {{{ */
{
const struct reserved_class_name *reserved = reserved_class_names;
const char *uqname = ZSTR_VAL(name);
size_t uqname_len = ZSTR_LEN(name);
zend_get_unqualified_name(name, &uqname, &uqname_len);
for (; reserved->name; ++reserved) {
if (uqname_len == reserved->len
&& zend_binary_strcasecmp(uqname, uqname_len, reserved->name, reserved->len) == 0
) {
return 1;
}
}
return 0;
}
/* }}} */
ZEND_API void zend_assert_valid_class_name(const zend_string *name) /* {{{ */
{
if (zend_is_reserved_class_name(name)) {
zend_error_noreturn(E_COMPILE_ERROR,
"Cannot use '%s' as class name as it is reserved", ZSTR_VAL(name));
}
}
/* }}} */
typedef struct _builtin_type_info {
const char* name;
const size_t name_len;
const zend_uchar type;
} builtin_type_info;
static const builtin_type_info builtin_types[] = {
{ZEND_STRL("int"), IS_LONG},
{ZEND_STRL("float"), IS_DOUBLE},
{ZEND_STRL("string"), IS_STRING},
{ZEND_STRL("bool"), _IS_BOOL},
{ZEND_STRL("void"), IS_VOID},
{ZEND_STRL("iterable"), IS_ITERABLE},
{NULL, 0, IS_UNDEF}
};
static zend_always_inline zend_uchar zend_lookup_builtin_type_by_name(const zend_string *name) /* {{{ */
{
const builtin_type_info *info = &builtin_types[0];
for (; info->name; ++info) {
if (ZSTR_LEN(name) == info->name_len
&& zend_binary_strcasecmp(ZSTR_VAL(name), ZSTR_LEN(name), info->name, info->name_len) == 0
) {
return info->type;
}
}
return 0;
}
/* }}} */
void zend_oparray_context_begin(zend_oparray_context *prev_context) /* {{{ */
{
*prev_context = CG(context);
CG(context).opcodes_size = INITIAL_OP_ARRAY_SIZE;
CG(context).vars_size = 0;
CG(context).literals_size = 0;
CG(context).backpatch_count = 0;
CG(context).in_finally = 0;
CG(context).fast_call_var = -1;
CG(context).try_catch_offset = -1;
CG(context).current_brk_cont = -1;
CG(context).last_brk_cont = 0;
CG(context).brk_cont_array = NULL;
CG(context).labels = NULL;
}
/* }}} */
void zend_oparray_context_end(zend_oparray_context *prev_context) /* {{{ */
{
if (CG(context).brk_cont_array) {
efree(CG(context).brk_cont_array);
CG(context).brk_cont_array = NULL;
}
if (CG(context).labels) {
zend_hash_destroy(CG(context).labels);
FREE_HASHTABLE(CG(context).labels);
CG(context).labels = NULL;
}
CG(context) = *prev_context;
}
/* }}} */
static void zend_reset_import_tables(void) /* {{{ */
{
if (FC(imports)) {
zend_hash_destroy(FC(imports));
efree(FC(imports));
FC(imports) = NULL;
}
if (FC(imports_function)) {
zend_hash_destroy(FC(imports_function));
efree(FC(imports_function));
FC(imports_function) = NULL;
}
if (FC(imports_const)) {
zend_hash_destroy(FC(imports_const));
efree(FC(imports_const));
FC(imports_const) = NULL;
}
}
/* }}} */
static void zend_end_namespace(void) /* {{{ */ {
FC(in_namespace) = 0;
zend_reset_import_tables();
if (FC(current_namespace)) {
zend_string_release(FC(current_namespace));
FC(current_namespace) = NULL;
}
}
/* }}} */
void zend_file_context_begin(zend_file_context *prev_context) /* {{{ */
{
*prev_context = CG(file_context);
FC(imports) = NULL;
FC(imports_function) = NULL;
FC(imports_const) = NULL;
FC(current_namespace) = NULL;
FC(in_namespace) = 0;
FC(has_bracketed_namespaces) = 0;
FC(declarables).ticks = 0;
}
/* }}} */
void zend_file_context_end(zend_file_context *prev_context) /* {{{ */
{
zend_end_namespace();
CG(file_context) = *prev_context;
}
/* }}} */
void zend_init_compiler_data_structures(void) /* {{{ */
{
zend_stack_init(&CG(loop_var_stack), sizeof(zend_loop_var));
zend_stack_init(&CG(delayed_oplines_stack), sizeof(zend_op));
CG(active_class_entry) = NULL;
CG(in_compilation) = 0;
CG(start_lineno) = 0;
zend_hash_init(&CG(const_filenames), 8, NULL, NULL, 0);
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, ZVAL_PTR_DTOR, 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_arena_destroy(CG(arena));
}
/* }}} */
ZEND_API zend_string *zend_set_compiled_filename(zend_string *new_compiled_filename) /* {{{ */
{
zval *p, rv;
if ((p = zend_hash_find(&CG(filenames_table), new_compiled_filename))) {
ZEND_ASSERT(Z_TYPE_P(p) == IS_STRING);
CG(compiled_filename) = Z_STR_P(p);
return Z_STR_P(p);
}
ZVAL_STR_COPY(&rv, new_compiled_filename);
zend_hash_update(&CG(filenames_table), new_compiled_filename, &rv);
CG(compiled_filename) = new_compiled_filename;
return new_compiled_filename;
}
/* }}} */
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 (ZSTR_VAL(op_array->vars[i]) == ZSTR_VAL(name) ||
(ZSTR_H(op_array->vars[i]) == hash_value &&
ZSTR_LEN(op_array->vars[i]) == ZSTR_LEN(name) &&
memcmp(ZSTR_VAL(op_array->vars[i]), ZSTR_VAL(name), ZSTR_LEN(name)) == 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 (ZSTR_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(ZSTR_VAL(lc_name), 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 = ZSTR_LEN(name);
const char *after_ns = zend_memrchr(ZSTR_VAL(name), '\\', ZSTR_LEN(name));
if (after_ns) {
after_ns += 1;
ns_len = after_ns - ZSTR_VAL(name) - 1;
after_ns_len = ZSTR_LEN(name) - ns_len - 1;
/* lowercased namespace name & original constant name */
tmp_name = zend_string_init(ZSTR_VAL(name), ZSTR_LEN(name), 0);
zend_str_tolower(ZSTR_VAL(tmp_name), 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 = ZSTR_VAL(name);
}
/* 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(ZSTR_VAL(tmp_name), 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)
void zend_stop_lexing(void)
{
if (LANG_SCNG(on_event)) {
LANG_SCNG(on_event)(ON_STOP, END, 0, LANG_SCNG(on_event_context));
}
LANG_SCNG(yy_cursor) = LANG_SCNG(yy_limit);
}
static uint32_t zend_start_live_range(zend_op_array *op_array, uint32_t start) /* {{{ */
{
zend_live_range *range;
op_array->last_live_range++;
op_array->live_range = erealloc(op_array->live_range, sizeof(zend_live_range) * op_array->last_live_range);
range = op_array->live_range + op_array->last_live_range - 1;
range->start = start;
return op_array->last_live_range - 1;
}
/* }}} */
static uint32_t zend_start_live_range_ex(zend_op_array *op_array, uint32_t start) /* {{{ */
{
if (op_array->last_live_range == 0 ||
op_array->live_range[op_array->last_live_range - 1].start <= start) {
return zend_start_live_range(op_array, start);
} else {
/* Live ranges have to be sorted by "start" field */
uint32_t n = op_array->last_live_range;
/* move early ranges to make a room */
op_array->last_live_range = n + 1;
op_array->live_range = erealloc(op_array->live_range, sizeof(zend_live_range) * op_array->last_live_range);
do {
op_array->live_range[n] = op_array->live_range[n-1];
n--;
} while (n != 0 && op_array->live_range[n-1].start > start);
/* initialize new range */
op_array->live_range[n].start = start;
/* update referens to live-ranges from stack */
if (!zend_stack_is_empty(&CG(loop_var_stack))) {
zend_loop_var *loop_var = zend_stack_top(&CG(loop_var_stack));
zend_loop_var *base = zend_stack_base(&CG(loop_var_stack));
int check_opcodes = 0;
for (; loop_var >= base; loop_var--) {
if (loop_var->opcode == ZEND_RETURN) {
/* Stack separator */
break;
} else if (loop_var->opcode == ZEND_FREE ||
loop_var->opcode == ZEND_FE_FREE) {
if (loop_var->u.live_range_offset >= n) {
loop_var->u.live_range_offset++;
check_opcodes = 1;
} else {
break;
}
}
}
/* update previously generated FREE/FE_FREE opcodes */
if (check_opcodes) {
zend_op *opline = op_array->opcodes + op_array->live_range[n+1].start;
zend_op *end = op_array->opcodes + op_array->last;
while (opline < end) {
if ((opline->opcode == ZEND_FREE ||
opline->opcode == ZEND_FE_FREE) &&
(opline->extended_value & ZEND_FREE_ON_RETURN) &&
opline->op2.num >= n) {
opline->op2.num++;
}
opline++;
}
}
}
return n;
}
}
/* }}} */
static void zend_end_live_range(zend_op_array *op_array, uint32_t offset, uint32_t end, uint32_t kind, uint32_t var) /* {{{ */
{
zend_live_range *range = op_array->live_range + offset;
if (range->start == end && offset == (uint32_t)op_array->last_live_range - 1) {
op_array->last_live_range--;
} else {
range->end = end;
range->var = (var * sizeof(zval)) | kind;
}
}
/* }}} */
static inline void zend_begin_loop(zend_uchar free_opcode, const znode *loop_var) /* {{{ */
{
zend_brk_cont_element *brk_cont_element;
int parent = CG(context).current_brk_cont;
zend_loop_var info = {0};
CG(context).current_brk_cont = CG(context).last_brk_cont;
brk_cont_element = get_next_brk_cont_element();
brk_cont_element->parent = parent;
if (loop_var && (loop_var->op_type & (IS_VAR|IS_TMP_VAR))) {
uint32_t start = get_next_op_number(CG(active_op_array));
info.opcode = free_opcode;
info.var_type = loop_var->op_type;
info.var_num = loop_var->u.op.var;
info.u.live_range_offset = zend_start_live_range(CG(active_op_array), start);
brk_cont_element->start = start;
} else {
info.opcode = ZEND_NOP;
/* The start field is used to free temporary variables in case of exceptions.
* We won't try to free something of we don't have loop variable. */
brk_cont_element->start = -1;
}
zend_stack_push(&CG(loop_var_stack), &info);
}
/* }}} */
static inline void zend_end_loop(int cont_addr, const znode *var_node) /* {{{ */
{
uint32_t end = get_next_op_number(CG(active_op_array));
zend_brk_cont_element *brk_cont_element
= &CG(context).brk_cont_array[CG(context).current_brk_cont];
brk_cont_element->cont = cont_addr;
brk_cont_element->brk = end;
CG(context).current_brk_cont = brk_cont_element->parent;
if (brk_cont_element->start != -1) {
zend_loop_var *loop_var = zend_stack_top(&CG(loop_var_stack));
zend_end_live_range(CG(active_op_array), loop_var->u.live_range_offset, end,
loop_var->opcode == ZEND_FE_FREE ? ZEND_LIVE_LOOP : ZEND_LIVE_TMPVAR,
var_node->u.op.var);
}
zend_stack_del_top(&CG(loop_var_stack));
}
/* }}} */
void zend_do_free(znode *op1) /* {{{ */
{
if (op1->op_type == IS_TMP_VAR) {
zend_op *opline = &CG(active_op_array)->opcodes[CG(active_op_array)->last-1];
while (opline->opcode == ZEND_END_SILENCE) {
opline--;
}
if (opline->result_type == IS_TMP_VAR && opline->result.var == op1->u.op.var) {
if (opline->opcode == ZEND_BOOL || opline->opcode == ZEND_BOOL_NOT) {
return;
}
}
zend_emit_op(NULL, ZEND_FREE, op1, NULL);
} 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 ||
opline->opcode == ZEND_FETCH_STATIC_PROP_R) {
/* It's very rare and useless case. It's better to use
additional FREE opcode and simplify the FETCH handlers
their selves */
zend_emit_op(NULL, ZEND_FREE, op1, NULL);
} else if (opline->opcode == ZEND_FETCH_THIS) {
opline->opcode = ZEND_NOP;
opline->result_type = IS_UNUSED;
} else {
opline->result_type = IS_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) {
zend_emit_op(NULL, ZEND_FREE, op1, NULL);
return;
}
if (opline->result_type == IS_VAR
&& opline->result.var == op1->u.op.var) {
if (opline->opcode == ZEND_NEW) {
zend_emit_op(NULL, ZEND_FREE, op1, NULL);
}
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(ZSTR_VAL(res), str1, str1_len);
memcpy(ZSTR_VAL(res) + str1_len, str2, str2_len);
memcpy(ZSTR_VAL(res) + str1_len + str2_len, str3, str3_len);
ZSTR_VAL(res)[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 (FC(current_namespace)) {
zend_string *ns = FC(current_namespace);
return zend_concat_names(ZSTR_VAL(ns), ZSTR_LEN(ns), ZSTR_VAL(name), ZSTR_LEN(name));
} 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);
ZSTR_ALLOCA_ALLOC(lcname, len, use_heap);
zend_str_tolower_copy(ZSTR_VAL(lcname), str, len);
result = zend_hash_find_ptr(ht, lcname);
ZSTR_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 (ZSTR_VAL(name)[0] == '\\') {
/* Remove \ prefix (only relevant if this is a string rather than a label) */
*is_fully_qualified = 1;
return zend_string_init(ZSTR_VAL(name) + 1, ZSTR_LEN(name) - 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, ZSTR_VAL(name), ZSTR_LEN(name));
}
if (import_name) {
*is_fully_qualified = 1;
return zend_string_copy(import_name);
}
}
compound = memchr(ZSTR_VAL(name), '\\', ZSTR_LEN(name));
if (compound) {
*is_fully_qualified = 1;
}
if (compound && FC(imports)) {
/* If the first part of a qualified name is an alias, substitute it. */
size_t len = compound - ZSTR_VAL(name);
zend_string *import_name = zend_hash_find_ptr_lc(FC(imports), ZSTR_VAL(name), len);
if (import_name) {
return zend_concat_names(
ZSTR_VAL(import_name), ZSTR_LEN(import_name), ZSTR_VAL(name) + len + 1, ZSTR_LEN(name) - 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, FC(imports_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, FC(imports_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 || ZSTR_VAL(name)[0] == '\\') {
/* Remove \ prefix (only relevant if this is a string rather than a label) */
if (ZSTR_VAL(name)[0] == '\\') {
name = zend_string_init(ZSTR_VAL(name) + 1, ZSTR_LEN(name) - 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", ZSTR_VAL(name));
}
return name;
}
if (FC(imports)) {
compound = memchr(ZSTR_VAL(name), '\\', ZSTR_LEN(name));
if (compound) {
/* If the first part of a qualified name is an alias, substitute it. */
size_t len = compound - ZSTR_VAL(name);
zend_string *import_name =
zend_hash_find_ptr_lc(FC(imports), ZSTR_VAL(name), len);
if (import_name) {
return zend_concat_names(
ZSTR_VAL(import_name), ZSTR_LEN(import_name), ZSTR_VAL(name) + len + 1, ZSTR_LEN(name) - len - 1);
}
} else {
/* If an unqualified name is an alias, replace it. */
zend_string *import_name
= zend_hash_find_ptr_lc(FC(imports), ZSTR_VAL(name), ZSTR_LEN(name));
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) /* {{{ */
{
zval *class_name = zend_ast_get_zval(ast);
if (Z_TYPE_P(class_name) != IS_STRING) {
zend_error_noreturn(E_COMPILE_ERROR, "Illegal class name");
}
return zend_resolve_class_name(Z_STR_P(class_name), ast->attr);