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/*
+----------------------------------------------------------------------+
| Zend Engine |
+----------------------------------------------------------------------+
| Copyright (c) 1998-2017 Zend Technologies Ltd. (http://www.zend.com) |
+----------------------------------------------------------------------+
| This source file is subject to version 2.00 of the Zend license, |
| that is bundled with this package in the file LICENSE, and is |
| available through the world-wide-web at the following url: |
| http://www.zend.com/license/2_00.txt. |
| If you did not receive a copy of the Zend license and are unable to |
| obtain it through the world-wide-web, please send a note to |
| license@zend.com so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
| Authors: Andi Gutmans <andi@zend.com> |
| Zeev Suraski <zeev@zend.com> |
| Nikita Popov <nikic@php.net> |
+----------------------------------------------------------------------+
*/
/* $Id$ */
#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;
zend_hash_init(&FC(seen_symbols), 8, NULL, NULL, 0);
}
/* }}} */
void zend_file_context_end(zend_file_context *prev_context) /* {{{ */
{
zend_end_namespace();
zend_hash_destroy(&FC(seen_symbols));
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;
CG(encoding_declared) = 0;
}
/* }}} */
static void zend_register_seen_symbol(zend_string *name, uint32_t kind) {
zval *zv = zend_hash_find(&FC(seen_symbols), name);
if (zv) {
Z_LVAL_P(zv) |= kind;
} else {
zval tmp;
ZVAL_LONG(&tmp, kind);
zend_hash_add_new(&FC(seen_symbols), name, &tmp);
}
}
static zend_bool zend_have_seen_symbol(zend_string *name, uint32_t kind) {
zval *zv = zend_hash_find(&FC(seen_symbols), name);
return zv && (Z_LVAL_P(zv) & kind) != 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_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);
}
/* }}} */
static void label_ptr_dtor(zval *zv) /* {{{ */
{
efree_size(Z_PTR_P(zv), sizeof(zend_label));
}
/* }}} */
static void str_dtor(zval *zv) /* {{{ */ {
zend_string_release(Z_STR_P(zv));
}
/* }}} */
static zend_bool zend_is_call(zend_ast *ast);
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;
if (op_array->refcount) {
(*op_array->refcount)++;
}
if (op_array->static_variables) {
if (!(GC_FLAGS(op_array->static_variables) & IS_ARRAY_IMMUTABLE)) {
GC_REFCOUNT(op_array->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 *lcname, *rtd_key;
if (compile_time) {
lcname = CT_CONSTANT_EX(op_array, opline->op1.constant);
rtd_key = lcname + 1;
} else {
lcname = RT_CONSTANT(op_array, opline->op1);
rtd_key = lcname + 1;
}
function = zend_hash_find_ptr(function_table, Z_STR_P(rtd_key));
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(lcname), new_function) == NULL) {
int error_level = compile_time ? E_COMPILE_ERROR : E_ERROR;
zend_function *old_function;
if ((old_function = zend_hash_find_ptr(function_table, Z_STR_P(lcname))) != NULL
&& old_function->type == ZEND_USER_FUNCTION
&& old_function->op_array.last > 0) {
zend_error_noreturn(error_level, "Cannot redeclare %s() (previously declared in %s:%d)",
ZSTR_VAL(function->common.function_name),
ZSTR_VAL(old_function->op_array.filename),
old_function->op_array.opcodes[0].lineno);
} else {
zend_error_noreturn(error_level, "Cannot redeclare %s()", ZSTR_VAL(function->common.function_name));
}
return FAILURE;
} else {
if (function->op_array.refcount) {
(*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 *lcname, *rtd_key;
if (compile_time) {
lcname = CT_CONSTANT_EX(op_array, opline->op1.constant);
rtd_key = lcname + 1;
} else {
lcname = RT_CONSTANT(op_array, opline->op1);
rtd_key = lcname + 1;
}
ce = zend_hash_find_ptr(class_table, Z_STR_P(rtd_key));
ZEND_ASSERT(ce);
ce->refcount++;
if (zend_hash_add_ptr(class_table, Z_STR_P(lcname), 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 declare %s %s, because the name is already in use", zend_get_object_type(ce), ZSTR_VAL(ce->name));
}
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 *lcname, *rtd_key;
if (compile_time) {
lcname = CT_CONSTANT_EX(op_array, opline->op1.constant);
rtd_key = lcname + 1;
} else {
lcname = RT_CONSTANT(op_array, opline->op1);
rtd_key = lcname + 1;
}
ce = zend_hash_find_ptr(class_table, Z_STR_P(rtd_key));
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 declare %s, because the name is already in use", zend_get_object_type(Z_OBJCE_P(lcname)));
}
return NULL;
}
if (zend_hash_exists(class_table, Z_STR_P(lcname))) {
zend_error_noreturn(E_COMPILE_ERROR, "Cannot declare %s %s, because the name is already in use", zend_get_object_type(ce), ZSTR_VAL(ce->name));
}
zend_do_inheritance(ce, parent_ce);
ce->refcount++;
/* Register the derived class */
if (zend_hash_add_ptr(class_table, Z_STR_P(lcname), ce) == NULL) {
zend_error_noreturn(E_COMPILE_ERROR, "Cannot declare %s %s, because the name is already in use", zend_get_object_type(ce), ZSTR_VAL(ce->name));
}
return ce;
}
/* }}} */
void zend_do_early_binding(void) /* {{{ */
{
zend_op *opline = &CG(active_op_array)->opcodes[CG(active_op_array)->last-1];
HashTable *table;
while (opline->opcode == ZEND_TICKS && opline > CG(active_op_array)->opcodes) {
opline--;
}
switch (opline->opcode) {
case ZEND_DECLARE_FUNCTION:
if (do_bind_function(CG(active_op_array), opline, CG(function_table), 1) == FAILURE) {
return;
}
table = CG(function_table);
break;
case ZEND_DECLARE_CLASS:
if (do_bind_class(CG(active_op_array), opline, CG(class_table), 1) == NULL) {
return;
}
table = CG(class_table);
break;
case ZEND_DECLARE_INHERITED_CLASS:
{
zend_op *fetch_class_opline = opline-1;
zval *parent_name;
zend_class_entry *ce;
parent_name = CT_CONSTANT(fetch_class_opline->op2);
if (((ce = zend_lookup_class_ex(Z_STR_P(parent_name), parent_name + 1, 0)) == NULL) ||
((CG(compiler_options) & ZEND_COMPILE_IGNORE_INTERNAL_CLASSES) &&
(ce->type == ZEND_INTERNAL_CLASS))) {
if (CG(compiler_options) & ZEND_COMPILE_DELAYED_BINDING) {
uint32_t *opline_num = &CG(active_op_array)->early_binding;
while (*opline_num != (uint32_t)-1) {
opline_num = &CG(active_op_array)->opcodes[*opline_num].result.opline_num;
}
*opline_num = opline - CG(active_op_array)->opcodes;
opline->opcode = ZEND_DECLARE_INHERITED_CLASS_DELAYED;
opline->result_type = IS_UNUSED;
opline->result.opline_num = -1;
}
return;
}
if (do_bind_inherited_class(CG(active_op_array), opline, CG(class_table), ce, 1) == NULL) {
return;
}
/* clear unnecessary ZEND_FETCH_CLASS opcode */
zend_del_literal(CG(active_op_array), fetch_class_opline->op2.constant);
MAKE_NOP(fetch_class_opline);
table = CG(class_table);
break;
}
case ZEND_VERIFY_ABSTRACT_CLASS:
case ZEND_ADD_INTERFACE:
case ZEND_ADD_TRAIT:
case ZEND_BIND_TRAITS:
/* We currently don't early-bind classes that implement interfaces */
/* Classes with traits are handled exactly the same, no early-bind here */
return;
default:
zend_error_noreturn(E_COMPILE_ERROR, "Invalid binding type");
return;
}
zend_hash_del(table, Z_STR_P(CT_CONSTANT(opline->op1)+1));
zend_del_literal(CG(active_op_array), opline->op1.constant+1);
zend_del_literal(CG(active_op_array), opline->op1.constant);
MAKE_NOP(opline);
}
/* }}} */
static void zend_mark_function_as_generator() /* {{{ */
{
if (!CG(active_op_array)->function_name) {
zend_error_noreturn(E_COMPILE_ERROR,
"The \"yield\" expression can only be used inside a function");
}
if (CG(active_op_array)->fn_flags & ZEND_ACC_HAS_RETURN_TYPE) {
zend_arg_info return_info = CG(active_op_array)->arg_info[-1];
if (ZEND_TYPE_CODE(return_info.type) != IS_ITERABLE) {
const char *msg = "Generators may only declare a return type of Generator, Iterator, Traversable, or iterable, %s is not permitted";
if (!ZEND_TYPE_IS_CLASS(return_info.type)) {
zend_error_noreturn(E_COMPILE_ERROR, msg, zend_get_type_by_const(ZEND_TYPE_CODE(return_info.type)));
}
if (!zend_string_equals_literal_ci(ZEND_TYPE_NAME(return_info.type), "Traversable")
&& !zend_string_equals_literal_ci(ZEND_TYPE_NAME(return_info.type), "Iterator")
&& !zend_string_equals_literal_ci(ZEND_TYPE_NAME(return_info.type), "Generator")) {
zend_error_noreturn(E_COMPILE_ERROR, msg, ZSTR_VAL(ZEND_TYPE_NAME(return_info.type)));
}
}
}
CG(active_op_array)->fn_flags |= ZEND_ACC_GENERATOR;
}
/* }}} */
ZEND_API void zend_do_delayed_early_binding(const zend_op_array *op_array) /* {{{ */
{
if (op_array->early_binding != (uint32_t)-1) {
zend_bool orig_in_compilation = CG(in_compilation);
uint32_t opline_num = op_array->early_binding;
zend_class_entry *ce;
CG(in_compilation) = 1;
while (opline_num != (uint32_t)-1) {
zval *parent_name = RT_CONSTANT(op_array, op_array->opcodes[opline_num-1].op2);
if ((ce = zend_lookup_class_ex(Z_STR_P(parent_name), parent_name + 1, 0)) != NULL) {
do_bind_inherited_class(op_array, &op_array->opcodes[opline_num], EG(class_table), ce, 0);
}
opline_num = op_array->opcodes[opline_num].result.opline_num;
}
CG(in_compilation) = orig_in_compilation;
}
}
/* }}} */
ZEND_API zend_string *zend_mangle_property_name(const char *src1, size_t src1_length, const char *src2, size_t src2_length, int internal) /* {{{ */
{
size_t prop_name_length = 1 + src1_length + 1 + src2_length;
zend_string *prop_name = zend_string_alloc(prop_name_length, internal);
ZSTR_VAL(prop_name)[0] = '\0';
memcpy(ZSTR_VAL(prop_name) + 1, src1, src1_length+1);
memcpy(ZSTR_VAL(prop_name) + 1 + src1_length + 1, src2, src2_length+1);
return prop_name;
}
/* }}} */
static zend_always_inline size_t zend_strnlen(const char* s, size_t maxlen) /* {{{ */
{
size_t len = 0;
while (*s++ && maxlen--) len++;
return len;
}
/* }}} */
ZEND_API int zend_unmangle_property_name_ex(const zend_string *name, const char **class_name, const char **prop_name, size_t *prop_len) /* {{{ */
{
size_t class_name_len;
size_t anonclass_src_len;
*class_name = NULL;
if (!ZSTR_LEN(name) || ZSTR_VAL(name)[0] != '\0') {
*prop_name = ZSTR_VAL(name);
if (prop_len) {
*prop_len = ZSTR_LEN(name);
}
return SUCCESS;
}
if (ZSTR_LEN(name) < 3 || ZSTR_VAL(name)[1] == '\0') {
zend_error(E_NOTICE, "Illegal member variable name");
*prop_name = ZSTR_VAL(name);
if (prop_len) {
*prop_len = ZSTR_LEN(name);
}
return FAILURE;
}
class_name_len = zend_strnlen(ZSTR_VAL(name) + 1, ZSTR_LEN(name) - 2);
if (class_name_len >= ZSTR_LEN(name) - 2 || ZSTR_VAL(name)[class_name_len + 1] != '\0') {
zend_error(E_NOTICE, "Corrupt member variable name");
*prop_name = ZSTR_VAL(name);
if (prop_len) {
*prop_len = ZSTR_LEN(name);
}
return FAILURE;
}
*class_name = ZSTR_VAL(name) + 1;
anonclass_src_len = zend_strnlen(*class_name + class_name_len + 1, ZSTR_LEN(name) - class_name_len - 2);
if (class_name_len + anonclass_src_len + 2 != ZSTR_LEN(name)) {
class_name_len += anonclass_src_len + 1;
}
*prop_name = ZSTR_VAL(name) + class_name_len + 2;
if (prop_len) {
*prop_len = ZSTR_LEN(name) - class_name_len - 2;
}
return SUCCESS;
}
/* }}} */
static zend_constant *zend_lookup_reserved_const(const char *name, size_t len) /* {{{ */
{
zend_constant *c = zend_hash_find_ptr_lc(EG(zend_constants), name, len);
if (c && !(c->flags & CONST_CS) && (c->flags & CONST_CT_SUBST)) {
return c;
}
return NULL;
}
/* }}} */
static zend_bool zend_try_ct_eval_const(zval *zv, zend_string *name, zend_bool is_fully_qualified) /* {{{ */
{
zend_constant *c;
/* Substitute case-sensitive (or lowercase) constants */
c = zend_hash_find_ptr(EG(zend_constants), name);
if (c && (
((c->flags & CONST_PERSISTENT) && !(CG(compiler_options) & ZEND_COMPILE_NO_PERSISTENT_CONSTANT_SUBSTITUTION))
|| (Z_TYPE(c->value) < IS_OBJECT && !(CG(compiler_options) & ZEND_COMPILE_NO_CONSTANT_SUBSTITUTION))
)) {
ZVAL_DUP(zv, &c->value);
return 1;
}
{
/* Substitute true, false and null (including unqualified usage in namespaces) */
const char *lookup_name = ZSTR_VAL(name);
size_t lookup_len = ZSTR_LEN(name);
if (!is_fully_qualified) {
zend_get_unqualified_name(name, &lookup_name, &lookup_len);
}
c = zend_lookup_reserved_const(lookup_name, lookup_len);
if (c) {
ZVAL_DUP(zv, &c->value);
return 1;
}
}
return 0;
}
/* }}} */
static inline zend_bool zend_is_scope_known() /* {{{ */
{
if (CG(active_op_array)->fn_flags & ZEND_ACC_CLOSURE) {
/* Closures can be rebound to a different scope */
return 0;
}
if (!CG(active_class_entry)) {
/* The scope is known if we're in a free function (no scope), but not if we're in
* a file/eval (which inherits including/eval'ing scope). */
return CG(active_op_array)->function_name != NULL;
}
/* For traits self etc refers to the using class, not the trait itself */
return (CG(active_class_entry)->ce_flags & ZEND_ACC_TRAIT) == 0;
}
/* }}} */
static inline zend_bool class_name_refers_to_active_ce(zend_string *class_name, uint32_t fetch_type) /* {{{ */
{
if (!CG(active_class_entry)) {
return 0;
}
if (fetch_type == ZEND_FETCH_CLASS_SELF && zend_is_scope_known()) {
return 1;
}
return fetch_type == ZEND_FETCH_CLASS_DEFAULT
&& zend_string_equals_ci(class_name, CG(active_class_entry)->name);
}
/* }}} */
uint32_t zend_get_class_fetch_type(zend_string *name) /* {{{ */
{
if (zend_string_equals_literal_ci(name, "self")) {
return ZEND_FETCH_CLASS_SELF;
} else if (zend_string_equals_literal_ci(name, "parent")) {
return ZEND_FETCH_CLASS_PARENT;
} else if (zend_string_equals_literal_ci(name, "static")) {
return ZEND_FETCH_CLASS_STATIC;
} else {
return ZEND_FETCH_CLASS_DEFAULT;
}
}
/* }}} */
static uint32_t zend_get_class_fetch_type_ast(zend_ast *name_ast) /* {{{ */
{
/* Fully qualified names are always default refs */
if (name_ast->attr == ZEND_NAME_FQ) {
return ZEND_FETCH_CLASS_DEFAULT;
}
return zend_get_class_fetch_type(zend_ast_get_str(name_ast));
}
/* }}} */
static void zend_ensure_valid_class_fetch_type(uint32_t fetch_type) /* {{{ */
{
if (fetch_type != ZEND_FETCH_CLASS_DEFAULT && !CG(active_class_entry) && zend_is_scope_known()) {
zend_error_noreturn(E_COMPILE_ERROR, "Cannot use \"%s\" when no class scope is active",
fetch_type == ZEND_FETCH_CLASS_SELF ? "self" :
fetch_type == ZEND_FETCH_CLASS_PARENT ? "parent" : "static");
}
}
/* }}} */
static zend_bool zend_try_compile_const_expr_resolve_class_name(zval *zv, zend_ast *class_ast, zend_ast *name_ast, zend_bool constant) /* {{{ */
{
uint32_t fetch_type;
if (name_ast->kind != ZEND_AST_ZVAL) {
return 0;
}
if (!zend_string_equals_literal_ci(zend_ast_get_str(name_ast), "class")) {
return 0;
}
if (class_ast->kind != ZEND_AST_ZVAL) {
zend_error_noreturn(E_COMPILE_ERROR,
"Dynamic class names are not allowed in compile-time ::class fetch");
}
fetch_type = zend_get_class_fetch_type(zend_ast_get_str(class_ast));
zend_ensure_valid_class_fetch_type(fetch_type);
switch (fetch_type) {
case ZEND_FETCH_CLASS_SELF:
if (constant || (CG(active_class_entry) && zend_is_scope_known())) {
ZVAL_STR_COPY(zv, CG(active_class_entry)->name);
} else {
ZVAL_NULL(zv);
}
return 1;
case ZEND_FETCH_CLASS_STATIC:
case ZEND_FETCH_CLASS_PARENT:
if (constant) {
zend_error_noreturn(E_COMPILE_ERROR,
"%s::class cannot be used for compile-time class name resolution",
fetch_type == ZEND_FETCH_CLASS_STATIC ? "static" : "parent"
);
} else {
ZVAL_NULL(zv);
}
return 1;
case ZEND_FETCH_CLASS_DEFAULT:
ZVAL_STR(zv, zend_resolve_class_name_ast(class_ast));
return 1;
EMPTY_SWITCH_DEFAULT_CASE()
}
}
/* }}} */
static zend_bool zend_try_ct_eval_class_const(zval *zv, zend_string *class_name, zend_string *name) /* {{{ */
{
uint32_t fetch_type = zend_get_class_fetch_type(class_name);
zend_class_constant *cc;
zval *c;
if (class_name_refers_to_active_ce(class_name, fetch_type)) {
cc = zend_hash_find_ptr(&CG(active_class_entry)->constants_table, name);
} else if (fetch_type == ZEND_FETCH_CLASS_DEFAULT && !(CG(compiler_options) & ZEND_COMPILE_NO_CONSTANT_SUBSTITUTION)) {
zend_class_entry *ce = zend_hash_find_ptr_lc(CG(class_table), ZSTR_VAL(class_name), ZSTR_LEN(class_name));
if (ce) {
cc = zend_hash_find_ptr(&ce->constants_table, name);
} else {
return 0;
}
} else {
return 0;
}
if (CG(compiler_options) & ZEND_COMPILE_NO_PERSISTENT_CONSTANT_SUBSTITUTION) {
return 0;
}
if (!cc || !zend_verify_const_access(cc, CG(active_class_entry))) {
return 0;
}
c = &cc->value;
/* Substitute case-sensitive (or lowercase) persistent class constants */
if (Z_TYPE_P(c) < IS_OBJECT) {
ZVAL_DUP(zv, c);
return 1;
}
return 0;
}
/* }}} */
static void zend_add_to_list(void *result, void *item) /* {{{ */
{
void** list = *(void**)result;
size_t n = 0;
if (list) {
while (list[n]) {
n++;
}
}
list = erealloc(list, sizeof(void*) * (n+2));
list[n] = item;
list[n+1] = NULL;
*(void**)result = list;
}
/* }}} */
void zend_do_extended_info(void) /* {{{ */
{
zend_op *opline;
if (!(CG(compiler_options) & ZEND_COMPILE_EXTENDED_INFO)) {
return;
}
opline = get_next_op(CG(active_op_array));
opline->opcode = ZEND_EXT_STMT;
SET_UNUSED(opline->op1);
SET_UNUSED(opline->op2);
}
/* }}} */
void zend_do_extended_fcall_begin(void) /* {{{ */
{
zend_op *opline;
if (!(CG(compiler_options) & ZEND_COMPILE_EXTENDED_INFO)) {
return;
}
opline = get_next_op(CG(active_op_array));
opline->opcode = ZEND_EXT_FCALL_BEGIN;
SET_UNUSED(opline->op1);
SET_UNUSED(opline->op2);
}
/* }}} */
void zend_do_extended_fcall_end(void) /* {{{ */
{
zend_op *opline;
if (!(CG(compiler_options) & ZEND_COMPILE_EXTENDED_INFO)) {
return;
}
opline = get_next_op(CG(active_op_array));
opline->opcode = ZEND_EXT_FCALL_END;
SET_UNUSED(opline->op1);
SET_UNUSED(opline->op2);
}
/* }}} */
zend_bool zend_is_auto_global_str(char *name, size_t len) /* {{{ */ {
zend_auto_global *auto_global;
if ((auto_global = zend_hash_str_find_ptr(CG(auto_globals), name, len)) != NULL) {
if (auto_global->armed) {
auto_global->armed = auto_global->auto_global_callback(auto_global->name);
}
return 1;
}
return 0;
}
/* }}} */
zend_bool zend_is_auto_global(zend_string *name) /* {{{ */
{
zend_auto_global *auto_global;
if ((auto_global = zend_hash_find_ptr(CG(auto_globals), name)) != NULL) {
if (auto_global->armed) {
auto_global->armed = auto_global->auto_global_callback(auto_global->name);
}
return 1;
}
return 0;
}
/* }}} */
int zend_register_auto_global(zend_string *name, zend_bool jit, zend_auto_global_callback auto_global_callback) /* {{{ */
{
zend_auto_global auto_global;
int retval;
auto_global.name = zend_new_interned_string(name);
auto_global.auto_global_callback = auto_global_callback;
auto_global.jit = jit;
retval = zend_hash_add_mem(CG(auto_globals), auto_global.name, &auto_global, sizeof(zend_auto_global)) != NULL ? SUCCESS : FAILURE;
zend_string_release(name);
return retval;
}
/* }}} */
ZEND_API void zend_activate_auto_globals(void) /* {{{ */
{
zend_auto_global *auto_global;
ZEND_HASH_FOREACH_PTR(CG(auto_globals), auto_global) {
if (auto_global->jit) {
auto_global->armed = 1;
} else if (auto_global->auto_global_callback) {
auto_global->armed = auto_global->auto_global_callback(auto_global->name);
} else {
auto_global->armed = 0;
}
} ZEND_HASH_FOREACH_END();
}
/* }}} */
int zendlex(zend_parser_stack_elem *elem) /* {{{ */
{
zval zv;
int retval;
if (CG(increment_lineno)) {
CG(zend_lineno)++;
CG(increment_lineno) = 0;
}
again:
ZVAL_UNDEF(&zv);
retval = lex_scan(&zv);
if (EG(exception)) {
return T_ERROR;
}
switch (retval) {
case T_COMMENT:
case T_DOC_COMMENT:
case T_OPEN_TAG:
case T_WHITESPACE:
goto again;
case T_CLOSE_TAG:
if (LANG_SCNG(yy_text)[LANG_SCNG(yy_leng)-1] != '>') {
CG(increment_lineno) = 1;
}
retval = ';'; /* implicit ; */
break;
case T_OPEN_TAG_WITH_ECHO:
retval = T_ECHO;
break;
}
if (Z_TYPE(zv) != IS_UNDEF) {
elem->ast = zend_ast_create_zval(&zv);
}
return retval;
}
/* }}} */
ZEND_API void zend_initialize_class_data(zend_class_entry *ce, zend_bool nullify_handlers) /* {{{ */
{
zend_bool persistent_hashes = (ce->type == ZEND_INTERNAL_CLASS) ? 1 : 0;
ce->refcount = 1;
ce->ce_flags = ZEND_ACC_CONSTANTS_UPDATED;
if (CG(compiler_options) & ZEND_COMPILE_GUARDS) {
ce->ce_flags |= ZEND_ACC_USE_GUARDS;
}
ce->default_properties_table = NULL;
ce->default_static_members_table = NULL;
zend_hash_init_ex(&ce->properties_info, 8, NULL, (persistent_hashes ? zend_destroy_property_info_internal : NULL), persistent_hashes, 0);
zend_hash_init_ex(&ce->constants_table, 8, NULL, (persistent_hashes ? zend_destroy_class_constant_internal : NULL), persistent_hashes, 0);
zend_hash_init_ex(&ce->function_table, 8, NULL, ZEND_FUNCTION_DTOR, persistent_hashes, 0);
if (ce->type == ZEND_INTERNAL_CLASS) {
#ifdef ZTS
int n = zend_hash_num_elements(CG(class_table));
if (CG(static_members_table) && n >= CG(last_static_member)) {
/* Support for run-time declaration: dl() */
CG(last_static_member) = n+1;
CG(static_members_table) = realloc(CG(static_members_table), (n+1)*sizeof(zval*));
CG(static_members_table)[n] = NULL;
}
ce->static_members_table = (zval*)(zend_intptr_t)n;
#else
ce->static_members_table = NULL;
#endif
} else {
ce->static_members_table = ce->default_static_members_table;
ce->info.user.doc_comment = NULL;
}
ce->default_properties_count = 0;
ce->default_static_members_count = 0;
if (nullify_handlers) {
ce->constructor = NULL;
ce->destructor = NULL;
ce->clone = NULL;
ce->__get = NULL;
ce->__set = NULL;
ce->__unset = NULL;
ce->__isset = NULL;
ce->__call = NULL;
ce->__callstatic = NULL;
ce->__tostring = NULL;
ce->create_object = NULL;
ce->get_iterator = NULL;
ce->iterator_funcs.funcs = NULL;
ce->interface_gets_implemented = NULL;
ce->get_static_method = NULL;
ce->parent = NULL;
ce->num_interfaces = 0;
ce->interfaces = NULL;
ce->num_traits = 0;
ce->traits = NULL;
ce->trait_aliases = NULL;
ce->trait_precedences = NULL;
ce->serialize = NULL;
ce->unserialize = NULL;
ce->serialize_func = NULL;
ce->unserialize_func = NULL;
ce->__debugInfo = NULL;
if (ce->type == ZEND_INTERNAL_CLASS) {
ce->info.internal.module = NULL;
ce->info.internal.builtin_functions = NULL;
}
}
}
/* }}} */
ZEND_API zend_string *zend_get_compiled_variable_name(const zend_op_array *op_array, uint32_t var) /* {{{ */
{
return op_array->vars[EX_VAR_TO_NUM(var)];
}
/* }}} */
zend_ast *zend_ast_append_str(zend_ast *left_ast, zend_ast *right_ast) /* {{{ */
{
zval *left_zv = zend_ast_get_zval(left_ast);
zend_string *left = Z_STR_P(left_zv);
zend_string *right = zend_ast_get_str(right_ast);
zend_string *result;
size_t left_len = ZSTR_LEN(left);
size_t len = left_len + ZSTR_LEN(right) + 1; /* left\right */
result = zend_string_extend(left, len, 0);
ZSTR_VAL(result)[left_len] = '\\';
memcpy(&ZSTR_VAL(result)[left_len + 1], ZSTR_VAL(right), ZSTR_LEN(right));
ZSTR_VAL(result)[len] = '\0';
zend_string_release(right);
ZVAL_STR(left_zv, result);
return left_ast;
}
/* }}} */
zend_ast *zend_negate_num_string(zend_ast *ast) /* {{{ */
{
zval *zv = zend_ast_get_zval(ast);
if (Z_TYPE_P(zv) == IS_LONG) {
if (Z_LVAL_P(zv) == 0) {
ZVAL_NEW_STR(zv, zend_string_init("-0", sizeof("-0")-1, 0));
} else {
ZEND_ASSERT(Z_LVAL_P(zv) > 0);
Z_LVAL_P(zv) *= -1;
}
} else if (Z_TYPE_P(zv) == IS_STRING) {
size_t orig_len = Z_STRLEN_P(zv);
Z_STR_P(zv) = zend_string_extend(Z_STR_P(zv), orig_len + 1, 0);
memmove(Z_STRVAL_P(zv) + 1, Z_STRVAL_P(zv), orig_len + 1);
Z_STRVAL_P(zv)[0] = '-';
} else {
ZEND_ASSERT(0);
}
return ast;
}
/* }}} */
void zend_verify_namespace(void) /* {{{ */
{
if (FC(has_bracketed_namespaces) && !FC(in_namespace)) {
zend_error_noreturn(E_COMPILE_ERROR, "No code may exist outside of namespace {}");
}
}
/* }}} */
/* {{{ zend_dirname
Returns directory name component of path */
ZEND_API size_t zend_dirname(char *path, size_t len)
{
register char *end = path + len - 1;
unsigned int len_adjust = 0;
#ifdef ZEND_WIN32
/* Note that on Win32 CWD is per drive (heritage from CP/M).
* This means dirname("c:foo") maps to "c:." or "c:" - which means CWD on C: drive.
*/
if ((2 <= len) && isalpha((int)((unsigned char *)path)[0]) && (':' == path[1])) {
/* Skip over the drive spec (if any) so as not to change */
path += 2;
len_adjust += 2;
if (2 == len) {
/* Return "c:" on Win32 for dirname("c:").
* It would be more consistent to return "c:."
* but that would require making the string *longer*.
*/
return len;
}
}
#endif
if (len == 0) {
/* Illegal use of this function */
return 0;
}
/* Strip trailing slashes */
while (end >= path && IS_SLASH_P(end)) {
end--;
}
if (end < path) {
/* The path only contained slashes */
path[0] = DEFAULT_SLASH;
path[1] = '\0';
return 1 + len_adjust;
}
/* Strip filename */
while (end >= path && !IS_SLASH_P(end)) {
end--;
}
if (end < path) {
/* No slash found, therefore return '.' */
path[0] = '.';
path[1] = '\0';
return 1 + len_adjust;
}
/* Strip slashes which came before the file name */
while (end >= path && IS_SLASH_P(end)) {
end--;
}
if (end < path) {
path[0] = DEFAULT_SLASH;
path[1] = '\0';
return 1 + len_adjust;
}
*(end+1) = '\0';
return (size_t)(end + 1 - path) + len_adjust;
}
/* }}} */
static void zend_adjust_for_fetch_type(zend_op *opline, uint32_t type) /* {{{ */
{
zend_uchar factor = (opline->opcode == ZEND_FETCH_STATIC_PROP_R) ? 1 : 3;
if (opline->opcode == ZEND_FETCH_THIS) {
return;
}
switch (type & BP_VAR_MASK) {
case BP_VAR_R:
return;
case BP_VAR_W:
opline->opcode += 1 * factor;
return;
case BP_VAR_RW:
opline->opcode += 2 * factor;
return;
case BP_VAR_IS:
opline->opcode += 3 * factor;
return;
case BP_VAR_FUNC_ARG:
opline->opcode += 4 * factor;
opline->extended_value |= type >> BP_VAR_SHIFT;
return;
case BP_VAR_UNSET:
opline->opcode += 5 * factor;
return;
EMPTY_SWITCH_DEFAULT_CASE()
}
}
/* }}} */
static inline void zend_make_var_result(znode *result, zend_op *opline) /* {{{ */
{
opline->result_type = IS_VAR;
opline->result.var = get_temporary_variable(CG(active_op_array));
GET_NODE(result, opline->result);
}
/* }}} */
static inline void zend_make_tmp_result(znode *result, zend_op *opline) /* {{{ */
{
opline->result_type = IS_TMP_VAR;
opline->result.var = get_temporary_variable(CG(active_op_array));
GET_NODE(result, opline->result);
}
/* }}} */
static void zend_find_live_range(zend_op *opline, zend_uchar type, uint32_t var) /* {{{ */
{
zend_op *def = opline;
while (def != CG(active_op_array)->opcodes) {
def--;
if (def->result_type == type && def->result.var == var) {
if (def->opcode == ZEND_ADD_ARRAY_ELEMENT ||
def->opcode == ZEND_ROPE_ADD) {
/* not a real definition */
continue;
} else if (def->opcode == ZEND_JMPZ_EX ||
def->opcode == ZEND_JMPNZ_EX ||
def->opcode == ZEND_BOOL ||
def->opcode == ZEND_BOOL_NOT) {
/* result IS_BOOL, it does't have to be destroyed */
break;
} else if (def->opcode == ZEND_DECLARE_CLASS ||
def->opcode == ZEND_DECLARE_INHERITED_CLASS ||
def->opcode == ZEND_DECLARE_INHERITED_CLASS_DELAYED ||
def->opcode == ZEND_DECLARE_ANON_CLASS ||
def->opcode == ZEND_DECLARE_ANON_INHERITED_CLASS) {
/* classes don't have to be destroyed */
break;
} else if (def->opcode == ZEND_FAST_CALL) {
/* fast_calls don't have to be destroyed */
break;
} else if (def->opcode == ZEND_NEW) {
/* Objects created via ZEND_NEW are only fully initialized
* after the DO_FCALL (constructor call) */
def = CG(active_op_array)->opcodes + def->op2.opline_num - 1;
if (def + 1 == opline) {
break;
}
}
zend_end_live_range(CG(active_op_array),
zend_start_live_range_ex(CG(active_op_array),
def + 1 - CG(active_op_array)->opcodes),
opline - CG(active_op_array)->opcodes,
ZEND_LIVE_TMPVAR, var);
break;
}
}
}
/* }}} */
static zend_always_inline int zend_is_def_range(zend_op *opline, zend_uchar type, uint32_t var) /* {{{ */
{
while (1) {
if (opline->result_type == type && opline->result.var == var) {
return opline->opcode != ZEND_ADD_ARRAY_ELEMENT &&
opline->opcode != ZEND_ROPE_ADD;
} else if (opline->opcode == ZEND_OP_DATA) {
return (opline-1)->result_type == type &&
(opline-1)->result.var == var;
} else if (opline->opcode == ZEND_END_SILENCE ||
opline->opcode == ZEND_NOP ||
opline->opcode == ZEND_EXT_NOP ||
opline->opcode == ZEND_EXT_STMT ||
opline->opcode == ZEND_EXT_FCALL_BEGIN ||
opline->opcode == ZEND_EXT_FCALL_END ||
opline->opcode == ZEND_TICKS) {
opline--;
} else {
return 0;
}
}
}
/* }}} */
static void zend_check_live_ranges(zend_op *opline) /* {{{ */
{
if ((opline->op1_type & (IS_VAR|IS_TMP_VAR)) &&
!zend_is_def_range(opline - 1, opline->op1_type, opline->op1.var)) {
if (opline->opcode == ZEND_OP_DATA) {
if (!zend_is_def_range(opline - 2, opline->op1_type, opline->op1.var)) {
zend_find_live_range(opline - 1, opline->op1_type, opline->op1.var);
}
} else if (opline->opcode == ZEND_INIT_STATIC_METHOD_CALL ||
opline->opcode == ZEND_NEW ||
opline->opcode == ZEND_FETCH_CLASS_CONSTANT ||
opline->opcode == ZEND_ADD_INTERFACE ||
opline->opcode == ZEND_ADD_TRAIT ||
opline->opcode == ZEND_BIND_TRAITS ||
opline->opcode == ZEND_VERIFY_ABSTRACT_CLASS) {
/* classes don't have to be destroyed */
} else if (opline->opcode == ZEND_FAST_RET) {
/* fast_calls don't have to be destroyed */
} else if (opline->opcode == ZEND_CASE ||
opline->opcode == ZEND_FE_FETCH_R ||
opline->opcode == ZEND_FE_FETCH_RW ||
opline->opcode == ZEND_FE_FREE ||
opline->opcode == ZEND_ROPE_ADD ||
opline->opcode == ZEND_ROPE_END ||
opline->opcode == ZEND_END_SILENCE ||
opline->opcode == ZEND_FETCH_LIST ||
opline->opcode == ZEND_VERIFY_RETURN_TYPE ||
opline->opcode == ZEND_BIND_LEXICAL) {
/* these opcodes are handled separately */
} else {
zend_find_live_range(opline, opline->op1_type, opline->op1.var);
}
}
if ((opline->op2_type & (IS_VAR|IS_TMP_VAR)) &&
!zend_is_def_range(opline - 1, opline->op2_type, opline->op2.var)) {
if (opline->opcode == ZEND_OP_DATA) {
if (!zend_is_def_range(opline - 2, opline->op2_type, opline->op2.var)) {
zend_find_live_range(opline-1, opline->op2_type, opline->op2.var);
}
} else if (opline->opcode == ZEND_FETCH_STATIC_PROP_R ||
opline->opcode == ZEND_FETCH_STATIC_PROP_W ||
opline->opcode == ZEND_FETCH_STATIC_PROP_RW ||
opline->opcode == ZEND_FETCH_STATIC_PROP_IS ||
opline->opcode == ZEND_FETCH_STATIC_PROP_FUNC_ARG ||
opline->opcode == ZEND_FETCH_STATIC_PROP_UNSET ||
opline->opcode == ZEND_UNSET_STATIC_PROP ||
opline->opcode == ZEND_ISSET_ISEMPTY_STATIC_PROP ||
opline->opcode == ZEND_INSTANCEOF) {
/* classes don't have to be destroyed */
} else {
zend_find_live_range(opline, opline->op2_type, opline->op2.var);
}
}
}
/* }}} */
static zend_op *zend_emit_op(znode *result, zend_uchar opcode, znode *op1, znode *op2) /* {{{ */
{
zend_op *opline = get_next_op(CG(active_op_array));
opline->opcode = opcode;
if (op1 == NULL) {
SET_UNUSED(opline->op1);
} else {
SET_NODE(opline->op1, op1);
}
if (op2 == NULL) {
SET_UNUSED(opline->op2);
} else {
SET_NODE(opline->op2, op2);
}
zend_check_live_ranges(opline);
if (result) {
zend_make_var_result(result, opline);
}
return opline;
}
/* }}} */
static zend_op *zend_emit_op_tmp(znode *result, zend_uchar opcode, znode *op1, znode *op2) /* {{{ */
{
zend_op *opline = get_next_op(CG(active_op_array));
opline->opcode = opcode;
if (op1 == NULL) {
SET_UNUSED(opline->op1);
} else {
SET_NODE(opline->op1, op1);
}
if (op2 == NULL) {
SET_UNUSED(opline->op2);
} else {
SET_NODE(opline->op2, op2);
}
zend_check_live_ranges(opline);
if (result) {
zend_make_tmp_result(result, opline);
}
return opline;
}
/* }}} */
static void zend_emit_tick(void) /* {{{ */
{
zend_op *opline;
/* This prevents a double TICK generated by the parser statement of "declare()" */
if (CG(active_op_array)->last && CG(active_op_array)->opcodes[CG(active_op_array)->last - 1].opcode == ZEND_TICKS) {
return;
}
opline = get_next_op(CG(active_op_array));
opline->opcode = ZEND_TICKS;
SET_UNUSED(opline->op1);
SET_UNUSED(opline->op2);
opline->extended_value = FC(declarables).ticks;
}
/* }}} */
static inline zend_op *zend_emit_op_data(znode *value) /* {{{ */
{
return zend_emit_op(NULL, ZEND_OP_DATA, value, NULL);
}
/* }}} */
static inline uint32_t zend_emit_jump(uint32_t opnum_target) /* {{{ */
{
uint32_t opnum = get_next_op_number(CG(active_op_array));
zend_op *opline = zend_emit_op(NULL, ZEND_JMP, NULL, NULL);
opline->op1.opline_num = opnum_target;
return opnum;
}
/* }}} */
ZEND_API int zend_is_smart_branch(zend_op *opline) /* {{{ */
{
switch (opline->opcode) {
case ZEND_IS_IDENTICAL:
case ZEND_IS_NOT_IDENTICAL:
case ZEND_IS_EQUAL:
case ZEND_IS_NOT_EQUAL:
case ZEND_IS_SMALLER:
case ZEND_IS_SMALLER_OR_EQUAL:
case ZEND_CASE:
case ZEND_ISSET_ISEMPTY_VAR:
case ZEND_ISSET_ISEMPTY_DIM_OBJ:
case ZEND_ISSET_ISEMPTY_PROP_OBJ:
case ZEND_ISSET_ISEMPTY_STATIC_PROP:
case ZEND_INSTANCEOF:
case ZEND_TYPE_CHECK:
case ZEND_DEFINED:
return 1;
default:
return 0;
}
}
/* }}} */
static inline uint32_t zend_emit_cond_jump(zend_uchar opcode, znode *cond, uint32_t opnum_target) /* {{{ */
{
uint32_t opnum = get_next_op_number(CG(active_op_array));
zend_op *opline;
if ((cond->op_type & (IS_CV|IS_CONST))
&& opnum > 0
&& zend_is_smart_branch(CG(active_op_array)->opcodes + opnum - 1)) {
/* emit extra NOP to avoid incorrect SMART_BRANCH in very rare cases */
zend_emit_op(NULL, ZEND_NOP, NULL, NULL);
opnum = get_next_op_number(CG(active_op_array));
}
opline = zend_emit_op(NULL, opcode, cond, NULL);
opline->op2.opline_num = opnum_target;
return opnum;
}
/* }}} */
static inline void zend_update_jump_target(uint32_t opnum_jump, uint32_t opnum_target) /* {{{ */
{
zend_op *opline = &CG(active_op_array)->opcodes[opnum_jump];
switch (opline->opcode) {
case ZEND_JMP:
opline->op1.opline_num = opnum_target;
break;
case ZEND_JMPZ:
case ZEND_JMPNZ:
case ZEND_JMPZ_EX:
case ZEND_JMPNZ_EX:
case ZEND_JMP_SET:
opline->op2.opline_num = opnum_target;
break;
EMPTY_SWITCH_DEFAULT_CASE()
}
}
/* }}} */
static inline void zend_update_jump_target_to_next(uint32_t opnum_jump) /* {{{ */
{
zend_update_jump_target(opnum_jump, get_next_op_number(CG(active_op_array)));
}
/* }}} */
static inline zend_op *zend_delayed_emit_op(znode *result, zend_uchar opcode, znode *op1, znode *op2) /* {{{ */
{
zend_op tmp_opline;
init_op(&tmp_opline);
tmp_opline.opcode = opcode;
if (op1 == NULL) {
SET_UNUSED(tmp_opline.op1);
} else {
SET_NODE(tmp_opline.op1, op1);
}
if (op2 == NULL) {
SET_UNUSED(tmp_opline.op2);
} else {
SET_NODE(tmp_opline.op2, op2);
}
if (result) {
zend_make_var_result(result, &tmp_opline);
}
zend_stack_push(&CG(delayed_oplines_stack), &tmp_opline);
return zend_stack_top(&CG(delayed_oplines_stack));
}
/* }}} */
static inline uint32_t zend_delayed_compile_begin(void) /* {{{ */
{
return zend_stack_count(&CG(delayed_oplines_stack));
}
/* }}} */
static zend_op *zend_delayed_compile_end(uint32_t offset) /* {{{ */
{
zend_op *opline = NULL, *oplines = zend_stack_base(&CG(delayed_oplines_stack));
uint32_t i, count = zend_stack_count(&CG(delayed_oplines_stack));
ZEND_ASSERT(count >= offset);
for (i = offset; i < count; ++i) {
opline = get_next_op(CG(active_op_array));
memcpy(opline, &oplines[i], sizeof(zend_op));
zend_check_live_ranges(opline);
}
CG(delayed_oplines_stack).top = offset;
return opline;
}
/* }}} */
static void zend_emit_return_type_check(
znode *expr, zend_arg_info *return_info, zend_bool implicit) /* {{{ */
{
if (ZEND_TYPE_IS_SET(return_info->type)) {
zend_op *opline;
/* `return ...;` is illegal in a void function (but `return;` isn't) */
if (ZEND_TYPE_CODE(return_info->type) == IS_VOID) {
if (expr) {
if (expr->op_type == IS_CONST && Z_TYPE(expr->u.constant) == IS_NULL) {
zend_error_noreturn(E_COMPILE_ERROR,
"A void function must not return a value "
"(did you mean \"return;\" instead of \"return null;\"?)");
} else {
zend_error_noreturn(E_COMPILE_ERROR, "A void function must not return a value");
}
}
/* we don't need run-time check */
return;
}
if (!expr && !implicit) {
if (ZEND_TYPE_ALLOW_NULL(return_info->type)) {
zend_error_noreturn(E_COMPILE_ERROR,
"A function with return type must return a value "
"(did you mean \"return null;\" instead of \"return;\"?)");
} else {
zend_error_noreturn(E_COMPILE_ERROR,
"A function with return type must return a value");
}
}
if (expr && expr->op_type == IS_CONST) {
if ((ZEND_TYPE_CODE(return_info->type) == Z_TYPE(expr->u.constant))
||((ZEND_TYPE_CODE(return_info->type) == _IS_BOOL)
&& (Z_TYPE(expr->u.constant) == IS_FALSE
|| Z_TYPE(expr->u.constant) == IS_TRUE))
|| (ZEND_TYPE_ALLOW_NULL(return_info->type)
&& Z_TYPE(expr->u.constant) == IS_NULL)) {
/* we don't need run-time check */
return;
}
}
opline = zend_emit_op(NULL, ZEND_VERIFY_RETURN_TYPE, expr, NULL);
if (expr && expr->op_type == IS_CONST) {
opline->result_type = expr->op_type = IS_TMP_VAR;
opline->result.var = expr->u.op.var = get_temporary_variable(CG(active_op_array));
}
if (ZEND_TYPE_IS_CLASS(return_info->type)) {
opline->op2.num = CG(active_op_array)->cache_size;
CG(active_op_array)->cache_size += sizeof(void*);
} else {
opline->op2.num = -1;
}
}
}
/* }}} */
void zend_emit_final_return(int return_one) /* {{{ */
{
znode zn;
zend_op *ret;
zend_bool returns_reference = (CG(active_op_array)->fn_flags & ZEND_ACC_RETURN_REFERENCE) != 0;
if (CG(active_op_array)->fn_flags & ZEND_ACC_HAS_RETURN_TYPE
&& !(CG(active_op_array)->fn_flags & ZEND_ACC_GENERATOR)) {
zend_emit_return_type_check(NULL, CG(active_op_array)->arg_info - 1, 1);
}
zn.op_type = IS_CONST;
if (return_one) {
ZVAL_LONG(&zn.u.constant, 1);
} else {
ZVAL_NULL(&zn.u.constant);
}
ret = zend_emit_op(NULL, returns_reference ? ZEND_RETURN_BY_REF : ZEND_RETURN, &zn, NULL);
ret->extended_value = -1;
}
/* }}} */
static inline zend_bool zend_is_variable(zend_ast *ast) /* {{{ */
{
return ast->kind == ZEND_AST_VAR || ast->kind == ZEND_AST_DIM
|| ast->kind == ZEND_AST_PROP || ast->kind == ZEND_AST_STATIC_PROP
|| ast->kind == ZEND_AST_CALL || ast->kind == ZEND_AST_METHOD_CALL
|| ast->kind == ZEND_AST_STATIC_CALL;
}
/* }}} */
static inline zend_bool zend_is_call(zend_ast *ast) /* {{{ */
{
return ast->kind == ZEND_AST_CALL
|| ast->kind == ZEND_AST_METHOD_CALL
|| ast->kind == ZEND_AST_STATIC_CALL;
}
/* }}} */
static inline zend_bool zend_is_unticked_stmt(zend_ast *ast) /* {{{ */
{
return ast->kind == ZEND_AST_STMT_LIST || ast->kind == ZEND_AST_LABEL
|| ast->kind == ZEND_AST_PROP_DECL || ast->kind == ZEND_AST_CLASS_CONST_DECL
|| ast->kind == ZEND_AST_USE_TRAIT || ast->kind == ZEND_AST_METHOD;
}
/* }}} */
static inline zend_bool zend_can_write_to_variable(zend_ast *ast) /* {{{ */
{
while (ast->kind == ZEND_AST_DIM || ast->kind == ZEND_AST_PROP) {
ast = ast->child[0];
}
return zend_is_variable(ast);
}
/* }}} */
static inline zend_bool zend_is_const_default_class_ref(zend_ast *name_ast) /* {{{ */
{
if (name_ast->kind != ZEND_AST_ZVAL) {
return 0;
}
return ZEND_FETCH_CLASS_DEFAULT == zend_get_class_fetch_type_ast(name_ast);
}
/* }}} */
static inline void zend_handle_numeric_op(znode *node) /* {{{ */
{
if (node->op_type == IS_CONST && Z_TYPE(node->u.constant) == IS_STRING) {
zend_ulong index;
if (ZEND_HANDLE_NUMERIC(Z_STR(node->u.constant), index)) {
zval_ptr_dtor(&node->u.constant);
ZVAL_LONG(&node->u.constant, index);
}
}
}
/* }}} */
static inline void zend_set_class_name_op1(zend_op *opline, znode *class_node) /* {{{ */
{
if (class_node->op_type == IS_CONST) {
opline->op1_type = IS_CONST;
opline->op1.constant = zend_add_class_name_literal(
CG(active_op_array), Z_STR(class_node->u.constant));
} else {
SET_NODE(opline->op1, class_node);
}
}
/* }}} */
static zend_op *zend_compile_class_ref(znode *result, zend_ast *name_ast, int throw_exception) /* {{{ */
{
zend_op *opline;
znode name_node;
zend_compile_expr(&name_node, name_ast);
if (name_node.op_type == IS_CONST) {
zend_string *name;
uint32_t fetch_type;
if (Z_TYPE(name_node.u.constant) != IS_STRING) {
zend_error_noreturn(E_COMPILE_ERROR, "Illegal class name");
}
name = Z_STR(name_node.u.constant);
fetch_type = zend_get_class_fetch_type(name);
opline = zend_emit_op(result, ZEND_FETCH_CLASS, NULL, NULL);
opline->extended_value = fetch_type | (throw_exception ? ZEND_FETCH_CLASS_EXCEPTION : 0);
if (fetch_type == ZEND_FETCH_CLASS_DEFAULT) {
uint32_t type = name_ast->kind == ZEND_AST_ZVAL ? name_ast->attr : ZEND_NAME_FQ;
opline->op2_type = IS_CONST;
opline->op2.constant = zend_add_class_name_literal(CG(active_op_array),
zend_resolve_class_name(name, type));
} else {
zend_ensure_valid_class_fetch_type(fetch_type);
}
zend_string_release(name);
} else {
opline = zend_emit_op(result, ZEND_FETCH_CLASS, NULL, &name_node);
opline->extended_value = ZEND_FETCH_CLASS_DEFAULT | (throw_exception ? ZEND_FETCH_CLASS_EXCEPTION : 0);
}
return opline;
}
/* }}} */
static void zend_compile_class_ref_ex(znode *result, zend_ast *name_ast, uint32_t fetch_flags) /* {{{ */
{
uint32_t fetch_type;
if (name_ast->kind != ZEND_AST_ZVAL) {
znode name_node;
zend_compile_expr(&name_node, name_ast);
if (name_node.op_type == IS_CONST) {
zend_string *name;
if (Z_TYPE(name_node.u.constant) != IS_STRING) {
zend_error_noreturn(E_COMPILE_ERROR, "Illegal class name");
}
name = Z_STR(name_node.u.constant);
fetch_type = zend_get_class_fetch_type(name);
if (fetch_type == ZEND_FETCH_CLASS_DEFAULT) {
result->op_type = IS_CONST;
ZVAL_STR(&result->u.constant, zend_resolve_class_name(name, ZEND_NAME_FQ));
} else {
zend_ensure_valid_class_fetch_type(fetch_type);
result->op_type = IS_UNUSED;
result->u.op.num = fetch_type | fetch_flags;
}
zend_string_release(name);
} else {
zend_op *opline = zend_emit_op(result, ZEND_FETCH_CLASS, NULL, &name_node);
opline->extended_value = ZEND_FETCH_CLASS_DEFAULT | fetch_flags;
}
return;
}
/* Fully qualified names are always default refs */
if (name_ast->attr == ZEND_NAME_FQ) {
result->op_type = IS_CONST;
ZVAL_STR(&result->u.constant, zend_resolve_class_name_ast(name_ast));
return;
}
fetch_type = zend_get_class_fetch_type(zend_ast_get_str(name_ast));
if (ZEND_FETCH_CLASS_DEFAULT == fetch_type) {
result->op_type = IS_CONST;
ZVAL_STR(&result->u.constant, zend_resolve_class_name_ast(name_ast));
} else {
zend_ensure_valid_class_fetch_type(fetch_type);
result->op_type = IS_UNUSED;
result->u.op.num = fetch_type | fetch_flags;
}
}
/* }}} */
static int zend_try_compile_cv(znode *result, zend_ast *ast) /* {{{ */
{
zend_ast *name_ast = ast->child[0];
if (name_ast->kind == ZEND_AST_ZVAL) {
zend_string *name = zval_get_string(zend_ast_get_zval(name_ast));
if (zend_is_auto_global(name)) {
zend_string_release(name);
return FAILURE;
}
result->op_type = IS_CV;
result->u.op.var = lookup_cv(CG(active_op_array), name);
/* lookup_cv may be using another zend_string instance */
name = CG(active_op_array)->vars[EX_VAR_TO_NUM(result->u.op.var)];
return SUCCESS;
}
return FAILURE;
}
/* }}} */
static zend_op *zend_compile_simple_var_no_cv(znode *result, zend_ast *ast, uint32_t type, int delayed) /* {{{ */
{
zend_ast *name_ast = ast->child[0];
znode name_node;
zend_op *opline;
zend_compile_expr(&name_node, name_ast);
if (name_node.op_type == IS_CONST) {
convert_to_string(&name_node.u.constant);
}
if (delayed) {
opline = zend_delayed_emit_op(result, ZEND_FETCH_R, &name_node, NULL);
} else {
opline = zend_emit_op(result, ZEND_FETCH_R, &name_node, NULL);
}
if (name_node.op_type == IS_CONST &&
zend_is_auto_global(Z_STR(name_node.u.constant))) {
opline->extended_value = ZEND_FETCH_GLOBAL;
} else {
opline->extended_value = ZEND_FETCH_LOCAL;
}
return opline;
}
/* }}} */
static zend_bool is_this_fetch(zend_ast *ast) /* {{{ */
{
if (ast->kind == ZEND_AST_VAR && ast->child[0]->kind == ZEND_AST_ZVAL) {
zval *name = zend_ast_get_zval(ast->child[0]);
return Z_TYPE_P(name) == IS_STRING && zend_string_equals_literal(Z_STR_P(name), "this");
}
return 0;
}
/* }}} */
static void zend_compile_simple_var(znode *result, zend_ast *ast, uint32_t type, int delayed) /* {{{ */
{
zend_op *opline;
if (is_this_fetch(ast)) {
opline = zend_emit_op(result, ZEND_FETCH_THIS, NULL, NULL);
zend_adjust_for_fetch_type(opline, type);
} else if (zend_try_compile_cv(result, ast) == FAILURE) {
zend_op *opline = zend_compile_simple_var_no_cv(result, ast, type, delayed);
zend_adjust_for_fetch_type(opline, type);
}
}
/* }}} */
static void zend_separate_if_call_and_write(znode *node, zend_ast *ast, uint32_t type) /* {{{ */
{
if (type != BP_VAR_R && type != BP_VAR_IS && zend_is_call(ast)) {
if (node->op_type == IS_VAR) {
zend_op *opline = zend_emit_op(NULL, ZEND_SEPARATE, node, NULL);
opline->result_type = IS_VAR;
opline->result.var = opline->op1.var;
} else {
zend_error_noreturn(E_COMPILE_ERROR, "Cannot use result of built-in function in write context");
}
}
}
/* }}} */
void zend_delayed_compile_var(znode *result, zend_ast *ast, uint32_t type);
void zend_compile_assign(znode *result, zend_ast *ast);
static void zend_compile_list_assign(znode *result, zend_ast *ast, znode *expr_node, zend_bool old_style);
static inline void zend_emit_assign_znode(zend_ast *var_ast, znode *value_node) /* {{{ */
{
znode dummy_node;
if (var_ast->kind == ZEND_AST_ARRAY) {
zend_compile_list_assign(&dummy_node, var_ast, value_node, var_ast->attr);
} else {
zend_ast *assign_ast = zend_ast_create(ZEND_AST_ASSIGN, var_ast,
zend_ast_create_znode(value_node));
zend_compile_assign(&dummy_node, assign_ast);
}
zend_do_free(&dummy_node);
}
/* }}} */
static zend_op *zend_delayed_compile_dim(znode *result, zend_ast *ast, uint32_t type) /* {{{ */
{
zend_ast *var_ast = ast->child[0];
zend_ast *dim_ast = ast->child[1];
znode var_node, dim_node;
zend_delayed_compile_var(&var_node, var_ast, type);
zend_separate_if_call_and_write(&var_node, var_ast, type);
if (dim_ast == NULL) {
if (type == BP_VAR_R || type == BP_VAR_IS) {
zend_error_noreturn(E_COMPILE_ERROR, "Cannot use [] for reading");
}
if (type == BP_VAR_UNSET) {
zend_error_noreturn(E_COMPILE_ERROR, "Cannot use [] for unsetting");
}
dim_node.op_type = IS_UNUSED;
} else {
zend_compile_expr(&dim_node, dim_ast);
zend_handle_numeric_op(&dim_node);
}
return zend_delayed_emit_op(result, ZEND_FETCH_DIM_R, &var_node, &dim_node);
}
/* }}} */
static inline zend_op *zend_compile_dim_common(znode *result, zend_ast *ast, uint32_t type) /* {{{ */
{
uint32_t offset = zend_delayed_compile_begin();
zend_delayed_compile_dim(result, ast, type);
return zend_delayed_compile_end(offset);
}
/* }}} */
void zend_compile_dim(znode *result, zend_ast *ast, uint32_t type) /* {{{ */
{
zend_op *opline = zend_compile_dim_common(result, ast, type);
zend_adjust_for_fetch_type(opline, type);
}
/* }}} */
static zend_op *zend_delayed_compile_prop(znode *result, zend_ast *ast, uint32_t type) /* {{{ */
{
zend_ast *obj_ast = ast->child[0];
zend_ast *prop_ast = ast->child[1];
znode obj_node, prop_node;
zend_op *opline;
if (is_this_fetch(obj_ast)) {
obj_node.op_type = IS_UNUSED;
} else {
zend_delayed_compile_var(&obj_node, obj_ast, type);
zend_separate_if_call_and_write(&obj_node, obj_ast, type);
}
zend_compile_expr(&prop_node, prop_ast);
opline = zend_delayed_emit_op(result, ZEND_FETCH_OBJ_R, &obj_node, &prop_node);
if (opline->op2_type == IS_CONST) {
convert_to_string(CT_CONSTANT(opline->op2));
zend_alloc_polymorphic_cache_slot(opline->op2.constant);
}
return opline;
}
/* }}} */
static zend_op *zend_compile_prop_common(znode *result, zend_ast *ast, uint32_t type) /* {{{ */
{
uint32_t offset = zend_delayed_compile_begin();
zend_delayed_compile_prop(result, ast, type);
return zend_delayed_compile_end(offset);
}
/* }}} */
void zend_compile_prop(znode *result, zend_ast *ast, uint32_t type) /* {{{ */
{
zend_op *opline = zend_compile_prop_common(result, ast, type);
zend_adjust_for_fetch_type(opline, type);
}
/* }}} */
zend_op *zend_compile_static_prop_common(znode *result, zend_ast *ast, uint32_t type, int delayed) /* {{{ */
{
zend_ast *class_ast = ast->child[0];
zend_ast *prop_ast = ast->child[1];
znode class_node, prop_node;
zend_op *opline;
zend_compile_class_ref_ex(&class_node, class_ast, ZEND_FETCH_CLASS_EXCEPTION);
zend_compile_expr(&prop_node, prop_ast);
if (delayed) {
opline = zend_delayed_emit_op(result, ZEND_FETCH_STATIC_PROP_R, &prop_node, NULL);
} else {
opline = zend_emit_op(result, ZEND_FETCH_STATIC_PROP_R, &prop_node, NULL);
}
if (opline->op1_type == IS_CONST) {
convert_to_string(CT_CONSTANT(opline->op1));
zend_alloc_polymorphic_cache_slot(opline->op1.constant);
}
if (class_node.op_type == IS_CONST) {
opline->op2_type = IS_CONST;
opline->op2.constant = zend_add_class_name_literal(
CG(active_op_array), Z_STR(class_node.u.constant));
} else {
SET_NODE(opline->op2, &class_node);
}
return opline;
}
/* }}} */
void zend_compile_static_prop(znode *result, zend_ast *ast, uint32_t type, int delayed) /* {{{ */
{
zend_op *opline = zend_compile_static_prop_common(result, ast, type, delayed);
zend_adjust_for_fetch_type(opline, type);
}
/* }}} */
static void zend_verify_list_assign_target(zend_ast *var_ast, zend_bool old_style) /* {{{ */ {
if (var_ast->kind == ZEND_AST_ARRAY) {
if (var_ast->attr == ZEND_ARRAY_SYNTAX_LONG) {
zend_error_noreturn(E_COMPILE_ERROR, "Cannot assign to array(), use [] instead");
}
if (old_style != var_ast->attr) {
zend_error_noreturn(E_COMPILE_ERROR, "Cannot mix [] and list()");
}
} else if (!zend_can_write_to_variable(var_ast)) {
zend_error_noreturn(E_COMPILE_ERROR, "Assignments can only happen to writable values");
}
}
/* }}} */
static void zend_compile_list_assign(
znode *result, zend_ast *ast, znode *expr_node, zend_bool old_style) /* {{{ */
{
zend_ast_list *list = zend_ast_get_list(ast);
uint32_t i;
zend_bool has_elems = 0;
zend_bool is_keyed =
list->children > 0 && list->child[0] != NULL && list->child[0]->child[1] != NULL;
for (i = 0; i < list->children; ++i) {
zend_ast *elem_ast = list->child[i];
zend_ast *var_ast, *key_ast;
znode fetch_result, dim_node;
if (elem_ast == NULL) {
if (is_keyed) {
zend_error(E_COMPILE_ERROR,
"Cannot use empty array entries in keyed array assignment");
} else {
continue;
}
}
if (elem_ast->attr) {
zend_error(E_COMPILE_ERROR, "[] and list() assignments cannot be by reference");
}
var_ast = elem_ast->child[0];
key_ast = elem_ast->child[1];
has_elems = 1;
if (is_keyed) {
if (key_ast == NULL) {
zend_error(E_COMPILE_ERROR,
"Cannot mix keyed and unkeyed array entries in assignments");
}
zend_compile_expr(&dim_node, key_ast);
} else {
if (key_ast != NULL) {
zend_error(E_COMPILE_ERROR,
"Cannot mix keyed and unkeyed array entries in assignments");
}
dim_node.op_type = IS_CONST;
ZVAL_LONG(&dim_node.u.constant, i);
}
if (expr_node->op_type == IS_CONST) {
Z_TRY_ADDREF(expr_node->u.constant);
}
zend_verify_list_assign_target(var_ast, old_style);
zend_emit_op(&fetch_result, ZEND_FETCH_LIST, expr_node, &dim_node);
zend_emit_assign_znode(var_ast, &fetch_result);
}
if (has_elems == 0) {
zend_error_noreturn(E_COMPILE_ERROR, "Cannot use empty list");
}
*result = *expr_node;
}
/* }}} */
static void zend_ensure_writable_variable(const zend_ast *ast) /* {{{ */
{
if (ast->kind == ZEND_AST_CALL) {
zend_error_noreturn(E_COMPILE_ERROR, "Can't use function return value in write context");
}
if (ast->kind == ZEND_AST_METHOD_CALL || ast->kind == ZEND_AST_STATIC_CALL) {
zend_error_noreturn(E_COMPILE_ERROR, "Can't use method return value in write context");
}
}
/* }}} */
/* Detects $a... = $a pattern */
zend_bool zend_is_assign_to_self(zend_ast *var_ast, zend_ast *expr_ast) /* {{{ */
{
if (expr_ast->kind != ZEND_AST_VAR || expr_ast->child[0]->kind != ZEND_AST_ZVAL) {
return 0;
}
while (zend_is_variable(var_ast) && var_ast->kind != ZEND_AST_VAR) {
var_ast = var_ast->child[0];
}
if (var_ast->kind != ZEND_AST_VAR || var_ast->child[0]->kind != ZEND_AST_ZVAL) {
return 0;
}
{
zend_string *name1 = zval_get_string(zend_ast_get_zval(var_ast->child[0]));
zend_string *name2 = zval_get_string(zend_ast_get_zval(expr_ast->child[0]));
zend_bool result = zend_string_equals(name1, name2);
zend_string_release(name1);
zend_string_release(name2);
return result;
}
}
/* }}} */
/* Detects if list($a, $b, $c) contains variable with given name */
zend_bool zend_list_has_assign_to(zend_ast *list_ast, zend_string *name) /* {{{ */
{
zend_ast_list *list = zend_ast_get_list(list_ast);
uint32_t i;
for (i = 0; i < list->children; i++) {
zend_ast *elem_ast = list->child[i];
zend_ast *var_ast;
if (!elem_ast) {
continue;
}
var_ast = elem_ast->child[0];
/* Recursively check nested list()s */
if (var_ast->kind == ZEND_AST_ARRAY && zend_list_has_assign_to(var_ast, name)) {
return 1;
}
if (var_ast->kind == ZEND_AST_VAR && var_ast->child[0]->kind == ZEND_AST_ZVAL) {
zend_string *var_name = zval_get_string(zend_ast_get_zval(var_ast->child[0]));
zend_bool result = zend_string_equals(var_name, name);
zend_string_release(var_name);
if (result) {
return 1;
}
}
}
return 0;
}
/* }}} */
/* Detects patterns like list($a, $b, $c) = $a */
zend_bool zend_list_has_assign_to_self(zend_ast *list_ast, zend_ast *expr_ast) /* {{{ */
{
/* Only check simple variables on the RHS, as only CVs cause issues with this. */
if (expr_ast->kind == ZEND_AST_VAR && expr_ast->child[0]->kind == ZEND_AST_ZVAL) {
zend_string *name = zval_get_string(zend_ast_get_zval(expr_ast->child[0]));
zend_bool result = zend_list_has_assign_to(list_ast, name);
zend_string_release(name);
return result;
}
return 0;
}
/* }}} */
void zend_compile_assign(znode *result, zend_ast *ast) /* {{{ */
{
zend_ast *var_ast = ast->child[0];
zend_ast *expr_ast = ast->child[1];
znode var_node, expr_node;
zend_op *opline;
uint32_t offset;
if (is_this_fetch(var_ast)) {
zend_error_noreturn(E_COMPILE_ERROR, "Cannot re-assign $this");
}
zend_ensure_writable_variable(var_ast);
switch (var_ast->kind) {
case ZEND_AST_VAR:
case ZEND_AST_STATIC_PROP:
offset = zend_delayed_compile_begin();
zend_delayed_compile_var(&var_node, var_ast, BP_VAR_W);
zend_compile_expr(&expr_node, expr_ast);
zend_delayed_compile_end(offset);
zend_emit_op(result, ZEND_ASSIGN, &var_node, &expr_node);
return;
case ZEND_AST_DIM:
offset = zend_delayed_compile_begin();
zend_delayed_compile_dim(result, var_ast, BP_VAR_W);
if (zend_is_assign_to_self(var_ast, expr_ast)
&& !is_this_fetch(expr_ast)) {
/* $a[0] = $a should evaluate the right $a first */
zend_compile_simple_var_no_cv(&expr_node, expr_ast, BP_VAR_R, 0);
} else {
zend_compile_expr(&expr_node, expr_ast);
}
opline = zend_delayed_compile_end(offset);
opline->opcode = ZEND_ASSIGN_DIM;
opline = zend_emit_op_data(&expr_node);
return;
case ZEND_AST_PROP:
offset = zend_delayed_compile_begin();
zend_delayed_compile_prop(result, var_ast, BP_VAR_W);
zend_compile_expr(&expr_node, expr_ast);
opline = zend_delayed_compile_end(offset);
opline->opcode = ZEND_ASSIGN_OBJ;
zend_emit_op_data(&expr_node);
return;
case ZEND_AST_ARRAY:
if (zend_list_has_assign_to_self(var_ast, expr_ast)) {
/* list($a, $b) = $a should evaluate the right $a first */
zend_compile_simple_var_no_cv(&expr_node, expr_ast, BP_VAR_R, 0);
} else {
zend_compile_expr(&expr_node, expr_ast);
}
zend_compile_list_assign(result, var_ast, &expr_node, var_ast->attr);
return;
EMPTY_SWITCH_DEFAULT_CASE();
}
}
/* }}} */
void zend_compile_assign_ref(znode *result, zend_ast *ast) /* {{{ */
{
zend_ast *target_ast = ast->child[0];
zend_ast *source_ast = ast->child[1];
znode target_node, source_node;
zend_op *opline;
uint32_t offset;
if (is_this_fetch(target_ast)) {
zend_error_noreturn(E_COMPILE_ERROR, "Cannot re-assign $this");
}
zend_ensure_writable_variable(target_ast);
offset = zend_delayed_compile_begin();
zend_delayed_compile_var(&target_node, target_ast, BP_VAR_W);
zend_compile_var(&source_node, source_ast, BP_VAR_W);
if ((target_ast->kind != ZEND_AST_VAR
|| target_ast->child[0]->kind != ZEND_AST_ZVAL)
&& source_node.op_type != IS_CV) {
/* Both LHS and RHS expressions may modify the same data structure,
* and the modification during RHS evaluation may dangle the pointer
* to the result of the LHS evaluation.
* Use MAKE_REF instruction to replace direct pointer with REFERENCE.
* See: Bug #71539
*/
zend_emit_op(&source_node, ZEND_MAKE_REF, &source_node, NULL);
}
zend_delayed_compile_end(offset);
if (source_node.op_type != IS_VAR && zend_is_call(source_ast)) {
zend_error_noreturn(E_COMPILE_ERROR, "Cannot use result of built-in function in write context");
}
opline = zend_emit_op(result, ZEND_ASSIGN_REF, &target_node, &source_node);
if (zend_is_call(source_ast)) {
opline->extended_value = ZEND_RETURNS_FUNCTION;
}
}
/* }}} */
static inline void zend_emit_assign_ref_znode(zend_ast *var_ast, znode *value_node) /* {{{ */
{
zend_ast *assign_ast = zend_ast_create(ZEND_AST_ASSIGN_REF, var_ast,
zend_ast_create_znode(value_node));
zend_compile_assign_ref(NULL, assign_ast);
}
/* }}} */
void zend_compile_compound_assign(znode *result, zend_ast *ast) /* {{{ */
{
zend_ast *var_ast = ast->child[0];
zend_ast *expr_ast = ast->child[1];
uint32_t opcode = ast->attr;
znode var_node, expr_node;
zend_op *opline;
uint32_t offset;
zend_ensure_writable_variable(var_ast);
switch (var_ast->kind) {
case ZEND_AST_VAR:
case ZEND_AST_STATIC_PROP:
offset = zend_delayed_compile_begin();
zend_delayed_compile_var(&var_node, var_ast, BP_VAR_RW);
zend_compile_expr(&expr_node, expr_ast);
zend_delayed_compile_end(offset);
zend_emit_op(result, opcode, &var_node, &expr_node);
return;
case ZEND_AST_DIM:
offset = zend_delayed_compile_begin();
zend_delayed_compile_dim(result, var_ast, BP_VAR_RW);
zend_compile_expr(&expr_node, expr_ast);
opline = zend_delayed_compile_end(offset);
opline->opcode = opcode;
opline->extended_value = ZEND_ASSIGN_DIM;
opline = zend_emit_op_data(&expr_node);
return;
case ZEND_AST_PROP:
offset = zend_delayed_compile_begin();
zend_delayed_compile_prop(result, var_ast, BP_VAR_RW);
zend_compile_expr(&expr_node, expr_ast);
opline = zend_delayed_compile_end(offset);
opline->opcode = opcode;
opline->extended_value = ZEND_ASSIGN_OBJ;
zend_emit_op_data(&expr_node);
return;
EMPTY_SWITCH_DEFAULT_CASE()
}
}
/* }}} */
uint32_t zend_compile_args(zend_ast *ast, zend_function *fbc) /* {{{ */
{
zend_ast_list *args = zend_ast_get_list(ast);
uint32_t i;
zend_bool uses_arg_unpack = 0;
uint32_t arg_count = 0; /* number of arguments not including unpacks */
for (i = 0; i < args->children; ++i) {
zend_ast *arg = args->child[i];
uint32_t arg_num = i + 1;
znode arg_node;
zend_op *opline;
zend_uchar opcode;
if (arg->kind == ZEND_AST_UNPACK) {
uses_arg_unpack = 1;
fbc = NULL;
zend_compile_expr(&arg_node, arg->child[0]);
opline = zend_emit_op(NULL, ZEND_SEND_UNPACK, &arg_node, NULL);
opline->op2.num = arg_count;
opline->result.var = (uint32_t)(zend_intptr_t)ZEND_CALL_ARG(NULL, arg_count);
continue;
}
if (uses_arg_unpack) {
zend_error_noreturn(E_COMPILE_ERROR,
"Cannot use positional argument after argument unpacking");
}
arg_count++;
if (zend_is_variable(arg)) {
if (zend_is_call(arg)) {
zend_compile_var(&arg_node, arg, BP_VAR_R);
if (arg_node.op_type & (IS_CONST|IS_TMP_VAR)) {
/* Function call was converted into builtin instruction */
opcode = ZEND_SEND_VAL;
} else {
if (fbc) {
if (ARG_MUST_BE_SENT_BY_REF(fbc, arg_num)) {
opcode = ZEND_SEND_VAR_NO_REF;
} else if (ARG_MAY_BE_SENT_BY_REF(fbc, arg_num)) {
opcode = ZEND_SEND_VAL;
} else {
opcode = ZEND_SEND_VAR;
}
} else {
opcode = ZEND_SEND_VAR_NO_REF_EX;