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zend_compile.c
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/*
+----------------------------------------------------------------------+
| Zend Engine |
+----------------------------------------------------------------------+
| Copyright (c) Zend Technologies Ltd. (http://www.zend.com) |
+----------------------------------------------------------------------+
| This source file is subject to version 2.00 of the Zend license, |
| that is bundled with this package in the file LICENSE, and is |
| available through the world-wide-web at the following url: |
| http://www.zend.com/license/2_00.txt. |
| If you did not receive a copy of the Zend license and are unable to |
| obtain it through the world-wide-web, please send a note to |
| license@zend.com so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
| Authors: Andi Gutmans <andi@php.net> |
| Zeev Suraski <zeev@php.net> |
| Nikita Popov <nikic@php.net> |
+----------------------------------------------------------------------+
*/
#include <zend_language_parser.h>
#include "zend.h"
#include "zend_ast.h"
#include "zend_attributes.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"
#include "zend_enum.h"
#include "zend_observer.h"
#include "zend_call_stack.h"
#include "zend_frameless_function.h"
#include "zend_property_hooks.h"
#define SET_NODE(target, src) do { \
target ## _type = (src)->op_type; \
if ((src)->op_type == IS_CONST) { \
target.constant = zend_add_literal(&(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 {
uint8_t opcode;
uint8_t var_type;
uint32_t var_num;
uint32_t try_catch_offset;
} zend_loop_var;
static inline uint32_t zend_alloc_cache_slots(unsigned count) {
if (count == 0) {
/* Even if no cache slots are desired, the VM handler may still want to acquire
* CACHE_ADDR() unconditionally. Returning zero makes sure that the address
* calculation is still legal and ubsan does not complain. */
return 0;
}
zend_op_array *op_array = CG(active_op_array);
uint32_t ret = op_array->cache_size;
op_array->cache_size += count * sizeof(void*);
return ret;
}
static inline uint32_t zend_alloc_cache_slot(void) {
return zend_alloc_cache_slots(1);
}
ZEND_API zend_op_array *(*zend_compile_file)(zend_file_handle *file_handle, int type);
ZEND_API zend_op_array *(*zend_compile_string)(zend_string *source_string, const char *filename, zend_compile_position position);
#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, uint8_t opcode, znode *op1, znode *op2);
static bool zend_try_ct_eval_array(zval *result, zend_ast *ast);
static void zend_eval_const_expr(zend_ast **ast_ptr);
static zend_op *zend_compile_var(znode *result, zend_ast *ast, uint32_t type, bool by_ref);
static zend_op *zend_delayed_compile_var(znode *result, zend_ast *ast, uint32_t type, bool by_ref);
static void zend_compile_expr(znode *result, zend_ast *ast);
static void zend_compile_stmt(zend_ast *ast);
static void zend_compile_assign(znode *result, zend_ast *ast);
#ifdef ZEND_CHECK_STACK_LIMIT
zend_never_inline static void zend_stack_limit_error(void)
{
size_t max_stack_size = 0;
if ((uintptr_t) EG(stack_base) > (uintptr_t) EG(stack_limit)) {
max_stack_size = (size_t) ((uintptr_t) EG(stack_base) - (uintptr_t) EG(stack_limit));
}
zend_error_noreturn(E_COMPILE_ERROR,
"Maximum call stack size of %zu bytes (zend.max_allowed_stack_size - zend.reserved_stack_size) reached during compilation. Try splitting expression",
max_stack_size);
}
static void zend_check_stack_limit(void)
{
if (UNEXPECTED(zend_call_stack_overflowed(EG(stack_limit)))) {
zend_stack_limit_error();
}
}
#else /* ZEND_CHECK_STACK_LIMIT */
static void zend_check_stack_limit(void)
{
}
#endif /* ZEND_CHECK_STACK_LIMIT */
static void init_op(zend_op *op)
{
MAKE_NOP(op);
op->extended_value = 0;
op->lineno = CG(zend_lineno);
#ifdef ZEND_VERIFY_TYPE_INFERENCE
op->op1_use_type = 0;
op->op2_use_type = 0;
op->result_use_type = 0;
op->op1_def_type = 0;
op->op2_def_type = 0;
op->result_def_type = 0;
#endif
}
static zend_always_inline uint32_t get_next_op_number(void)
{
return CG(active_op_array)->last;
}
static zend_op *get_next_op(void)
{
zend_op_array *op_array = CG(active_op_array);
uint32_t next_op_num = op_array->last++;
zend_op *next_op;
if (UNEXPECTED(next_op_num >= CG(context).opcodes_size)) {
CG(context).opcodes_size *= 4;
op_array->opcodes = erealloc(op_array->opcodes, CG(context).opcodes_size * sizeof(zend_op));
}
next_op = &(op_array->opcodes[next_op_num]);
init_op(next_op);
return next_op;
}
static zend_brk_cont_element *get_next_brk_cont_element(void)
{
CG(context).last_brk_cont++;
CG(context).brk_cont_array = erealloc(CG(context).brk_cont_array, sizeof(zend_brk_cont_element) * CG(context).last_brk_cont);
return &CG(context).brk_cont_array[CG(context).last_brk_cont-1];
}
static zend_string *zend_build_runtime_definition_key(zend_string *name, uint32_t start_lineno) /* {{{ */
{
zend_string *filename = CG(active_op_array)->filename;
zend_string *result = zend_strpprintf(0, "%c%s%s:%" PRIu32 "$%" PRIx32,
'\0', ZSTR_VAL(name), ZSTR_VAL(filename), start_lineno, CG(rtd_key_counter)++);
return zend_new_interned_string(result);
}
/* }}} */
static 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("never")},
{ZEND_STRL("iterable")},
{ZEND_STRL("object")},
{ZEND_STRL("mixed")},
/* These are not usable as class names because they're proper tokens,
* but they are here for class aliases. */
{ZEND_STRL("array")},
{ZEND_STRL("callable")},
{NULL, 0}
};
static 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;
}
/* }}} */
void zend_assert_valid_class_name(const zend_string *name, const char *type) /* {{{ */
{
if (zend_is_reserved_class_name(name)) {
zend_error_noreturn(E_COMPILE_ERROR,
"Cannot use \"%s\" as %s as it is reserved", ZSTR_VAL(name), type);
}
if (zend_string_equals_literal(name, "_")) {
zend_error(E_DEPRECATED, "Using \"_\" as %s is deprecated since 8.4", type);
}
}
/* }}} */
typedef struct _builtin_type_info {
const char* name;
const size_t name_len;
const uint8_t type;
} builtin_type_info;
static const builtin_type_info builtin_types[] = {
{ZEND_STRL("null"), IS_NULL},
{ZEND_STRL("true"), IS_TRUE},
{ZEND_STRL("false"), IS_FALSE},
{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("never"), IS_NEVER},
{ZEND_STRL("iterable"), IS_ITERABLE},
{ZEND_STRL("object"), IS_OBJECT},
{ZEND_STRL("mixed"), IS_MIXED},
{NULL, 0, IS_UNDEF}
};
typedef struct {
const char *name;
size_t name_len;
const char *correct_name;
} confusable_type_info;
static const confusable_type_info confusable_types[] = {
{ZEND_STRL("boolean"), "bool"},
{ZEND_STRL("integer"), "int"},
{ZEND_STRL("double"), "float"},
{ZEND_STRL("resource"), NULL},
{NULL, 0, NULL},
};
static zend_always_inline uint8_t 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;
}
/* }}} */
static zend_always_inline bool zend_is_confusable_type(const zend_string *name, const char **correct_name) /* {{{ */
{
const confusable_type_info *info = confusable_types;
/* Intentionally using case-sensitive comparison here, because "integer" is likely intended
* as a scalar type, while "Integer" is likely a class type. */
for (; info->name; ++info) {
if (zend_string_equals_cstr(name, info->name, info->name_len)) {
*correct_name = info->correct_name;
return 1;
}
}
return 0;
}
/* }}} */
static bool zend_is_not_imported(zend_string *name) {
/* Assuming "name" is unqualified here. */
return !FC(imports) || zend_hash_find_ptr_lc(FC(imports), name) == NULL;
}
void zend_oparray_context_begin(zend_oparray_context *prev_context, zend_op_array *op_array) /* {{{ */
{
*prev_context = CG(context);
CG(context).prev = CG(context).op_array ? prev_context : NULL;
CG(context).op_array = op_array;
CG(context).opcodes_size = INITIAL_OP_ARRAY_SIZE;
CG(context).vars_size = 0;
CG(context).literals_size = 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;
CG(context).in_jmp_frameless_branch = false;
CG(context).active_property_info_name = NULL;
CG(context).active_property_hook_kind = (zend_property_hook_kind)-1;
}
/* }}} */
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;
}
zend_hash_clean(&FC(seen_symbols));
}
/* }}} */
static void zend_end_namespace(void) /* {{{ */ {
FC(in_namespace) = 0;
zend_reset_import_tables();
if (FC(current_namespace)) {
zend_string_release_ex(FC(current_namespace), 0);
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));
zend_stack_init(&CG(short_circuiting_opnums), sizeof(uint32_t));
CG(active_class_entry) = NULL;
CG(in_compilation) = 0;
CG(skip_shebang) = 0;
CG(encoding_declared) = 0;
CG(memoized_exprs) = NULL;
CG(memoize_mode) = ZEND_MEMOIZE_NONE;
}
/* }}} */
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 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;
}
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_stream_init();
CG(unclean_shutdown) = 0;
CG(delayed_variance_obligations) = NULL;
CG(delayed_autoloads) = NULL;
CG(unlinked_uses) = NULL;
CG(current_linking_class) = NULL;
}
/* }}} */
void shutdown_compiler(void) /* {{{ */
{
/* Reset filename before destroying the arena, as file cache may use arena allocated strings. */
zend_restore_compiled_filename(NULL);
zend_stack_destroy(&CG(loop_var_stack));
zend_stack_destroy(&CG(delayed_oplines_stack));
zend_stack_destroy(&CG(short_circuiting_opnums));
if (CG(delayed_variance_obligations)) {
zend_hash_destroy(CG(delayed_variance_obligations));
FREE_HASHTABLE(CG(delayed_variance_obligations));
CG(delayed_variance_obligations) = NULL;
}
if (CG(delayed_autoloads)) {
zend_hash_destroy(CG(delayed_autoloads));
FREE_HASHTABLE(CG(delayed_autoloads));
CG(delayed_autoloads) = NULL;
}
if (CG(unlinked_uses)) {
zend_hash_destroy(CG(unlinked_uses));
FREE_HASHTABLE(CG(unlinked_uses));
CG(unlinked_uses) = NULL;
}
CG(current_linking_class) = NULL;
}
/* }}} */
ZEND_API zend_string *zend_set_compiled_filename(zend_string *new_compiled_filename) /* {{{ */
{
CG(compiled_filename) = zend_string_copy(new_compiled_filename);
return new_compiled_filename;
}
/* }}} */
ZEND_API void zend_restore_compiled_filename(zend_string *original_compiled_filename) /* {{{ */
{
if (CG(compiled_filename)) {
zend_string_release(CG(compiled_filename));
CG(compiled_filename) = NULL;
}
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 bool zend_is_compiling(void) /* {{{ */
{
return CG(in_compilation);
}
/* }}} */
static zend_always_inline uint32_t get_temporary_variable(void) /* {{{ */
{
return (uint32_t)CG(active_op_array)->T++;
}
/* }}} */
static int lookup_cv(zend_string *name) /* {{{ */{
zend_op_array *op_array = CG(active_op_array);
int i = 0;
zend_ulong hash_value = zend_string_hash_val(name);
while (i < op_array->last_var) {
if (ZSTR_H(op_array->vars[i]) == hash_value
&& zend_string_equals(op_array->vars[i], name)) {
return EX_NUM_TO_VAR(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_string_copy(name);
return EX_NUM_TO_VAR(i);
}
/* }}} */
zend_string *zval_make_interned_string(zval *zv)
{
ZEND_ASSERT(Z_TYPE_P(zv) == IS_STRING);
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) = 0;
}
return Z_STR_P(zv);
}
/* 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) /* {{{ */
{
zval *lit = CT_CONSTANT_EX(op_array, literal_position);
if (Z_TYPE_P(zv) == IS_STRING) {
zval_make_interned_string(zv);
}
ZVAL_COPY_VALUE(lit, zv);
Z_EXTRA_P(lit) = 0;
}
/* }}} */
/* 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()). */
static int zend_add_literal(zval *zv) /* {{{ */
{
zend_op_array *op_array = CG(active_op_array);
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_string **str) /* {{{ */
{
int ret;
zval zv;
ZVAL_STR(&zv, *str);
ret = zend_add_literal(&zv);
*str = Z_STR(zv);
return ret;
}
/* }}} */
static int zend_add_func_name_literal(zend_string *name) /* {{{ */
{
/* Original name */
int ret = zend_add_literal_string(&name);
/* Lowercased name */
zend_string *lc_name = zend_string_tolower(name);
zend_add_literal_string(&lc_name);
return ret;
}
/* }}} */
static int zend_add_ns_func_name_literal(zend_string *name) /* {{{ */
{
const char *unqualified_name;
size_t unqualified_name_len;
/* Original name */
int ret = zend_add_literal_string(&name);
/* Lowercased name */
zend_string *lc_name = zend_string_tolower(name);
zend_add_literal_string(&lc_name);
/* Lowercased unqualified 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(&lc_name);
}
return ret;
}
/* }}} */
static int zend_add_class_name_literal(zend_string *name) /* {{{ */
{
/* Original name */
int ret = zend_add_literal_string(&name);
/* Lowercased name */
zend_string *lc_name = zend_string_tolower(name);
zend_add_literal_string(&lc_name);
return ret;
}
/* }}} */
static int zend_add_const_name_literal(zend_string *name, bool unqualified) /* {{{ */
{
zend_string *tmp_name;
int ret = zend_add_literal_string(&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(&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(&tmp_name);
return ret;
}
/* }}} */
#define LITERAL_STR(op, str) do { \
zval _c; \
ZVAL_STR(&_c, str); \
op.constant = zend_add_literal(&_c); \
} while (0)
void zend_stop_lexing(void)
{
if (LANG_SCNG(on_event)) {
LANG_SCNG(on_event)(ON_STOP, END, 0, NULL, 0, LANG_SCNG(on_event_context));
}
LANG_SCNG(yy_cursor) = LANG_SCNG(yy_limit);
}
static inline void zend_begin_loop(
uint8_t free_opcode, const znode *loop_var, bool is_switch) /* {{{ */
{
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;
brk_cont_element->is_switch = is_switch;
if (loop_var && (loop_var->op_type & (IS_VAR|IS_TMP_VAR))) {
uint32_t start = get_next_op_number();
info.opcode = free_opcode;
info.var_type = loop_var->op_type;
info.var_num = loop_var->u.op.var;
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();
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;
zend_stack_del_top(&CG(loop_var_stack));
}
/* }}} */
static 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->opcode == ZEND_OP_DATA) {
opline--;
}
if (opline->result_type == IS_TMP_VAR && opline->result.var == op1->u.op.var) {
switch (opline->opcode) {
case ZEND_BOOL:
case ZEND_BOOL_NOT:
/* boolean results don't have to be freed */
return;
case ZEND_POST_INC_STATIC_PROP:
case ZEND_POST_DEC_STATIC_PROP:
case ZEND_POST_INC_OBJ:
case ZEND_POST_DEC_OBJ:
case ZEND_POST_INC:
case ZEND_POST_DEC:
/* convert $i++ to ++$i */
opline->opcode -= 2;
SET_UNUSED(opline->result);
return;
case ZEND_ASSIGN:
case ZEND_ASSIGN_DIM:
case ZEND_ASSIGN_OBJ:
case ZEND_ASSIGN_STATIC_PROP:
case ZEND_ASSIGN_OP:
case ZEND_ASSIGN_DIM_OP:
case ZEND_ASSIGN_OBJ_OP:
case ZEND_ASSIGN_STATIC_PROP_OP:
case ZEND_PRE_INC_STATIC_PROP:
case ZEND_PRE_DEC_STATIC_PROP:
case ZEND_PRE_INC_OBJ:
case ZEND_PRE_DEC_OBJ:
case ZEND_PRE_INC:
case ZEND_PRE_DEC:
SET_UNUSED(opline->result);
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_THIS) {
opline->opcode = ZEND_NOP;
}
if (!ZEND_OP_IS_FRAMELESS_ICALL(opline->opcode)) {
SET_UNUSED(opline->result);
} else {
/* Frameless calls usually use the return value, so always emit a free. This should be
* faster than checking RETURN_VALUE_USED inside the handler. */
// FIXME: We may actually look at the function signature to determine whether a free
// is necessary.
zend_emit_op(NULL, ZEND_FREE, op1, NULL);
}
} else {
while (opline >= CG(active_op_array)->opcodes) {
if ((opline->opcode == ZEND_FETCH_LIST_R ||
opline->opcode == ZEND_FETCH_LIST_W) &&
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);
}
}
/* }}} */
static const char *zend_modifier_token_to_string(uint32_t token)
{
switch (token) {
case T_PUBLIC:
return "public";
case T_PROTECTED:
return "protected";
case T_PRIVATE:
return "private";
case T_STATIC:
return "static";
case T_FINAL:
return "final";
case T_READONLY:
return "readonly";
case T_ABSTRACT:
return "abstract";
case T_PUBLIC_SET:
return "public(set)";
case T_PROTECTED_SET:
return "protected(set)";
case T_PRIVATE_SET:
return "private(set)";
EMPTY_SWITCH_DEFAULT_CASE()
}
}
uint32_t zend_modifier_token_to_flag(zend_modifier_target target, uint32_t token)
{
switch (token) {
case T_PUBLIC:
if (target != ZEND_MODIFIER_TARGET_PROPERTY_HOOK) {
return ZEND_ACC_PUBLIC;
}
break;
case T_PROTECTED:
if (target != ZEND_MODIFIER_TARGET_PROPERTY_HOOK) {
return ZEND_ACC_PROTECTED;
}
break;
case T_PRIVATE:
if (target != ZEND_MODIFIER_TARGET_PROPERTY_HOOK) {
return ZEND_ACC_PRIVATE;
}
break;
case T_READONLY:
if (target == ZEND_MODIFIER_TARGET_PROPERTY || target == ZEND_MODIFIER_TARGET_CPP) {
return ZEND_ACC_READONLY;
}
break;
case T_ABSTRACT:
if (target == ZEND_MODIFIER_TARGET_METHOD || target == ZEND_MODIFIER_TARGET_PROPERTY) {
return ZEND_ACC_ABSTRACT;
}
break;
case T_FINAL:
if (target == ZEND_MODIFIER_TARGET_METHOD
|| target == ZEND_MODIFIER_TARGET_CONSTANT
|| target == ZEND_MODIFIER_TARGET_PROPERTY
|| target == ZEND_MODIFIER_TARGET_PROPERTY_HOOK) {
return ZEND_ACC_FINAL;
}
break;
case T_STATIC:
if (target == ZEND_MODIFIER_TARGET_PROPERTY || target == ZEND_MODIFIER_TARGET_METHOD) {
return ZEND_ACC_STATIC;
}
break;
case T_PUBLIC_SET:
if (target == ZEND_MODIFIER_TARGET_PROPERTY || target == ZEND_MODIFIER_TARGET_CPP) {
return ZEND_ACC_PUBLIC_SET;
}
break;
case T_PROTECTED_SET:
if (target == ZEND_MODIFIER_TARGET_PROPERTY || target == ZEND_MODIFIER_TARGET_CPP) {
return ZEND_ACC_PROTECTED_SET;
}
break;
case T_PRIVATE_SET:
if (target == ZEND_MODIFIER_TARGET_PROPERTY || target == ZEND_MODIFIER_TARGET_CPP) {
return ZEND_ACC_PRIVATE_SET;
}
break;
}
char *member;
if (target == ZEND_MODIFIER_TARGET_PROPERTY) {
member = "property";
} else if (target == ZEND_MODIFIER_TARGET_METHOD) {
member = "method";
} else if (target == ZEND_MODIFIER_TARGET_CONSTANT) {
member = "class constant";
} else if (target == ZEND_MODIFIER_TARGET_CPP) {
member = "parameter";
} else if (target == ZEND_MODIFIER_TARGET_PROPERTY_HOOK) {
member = "property hook";
} else {
ZEND_UNREACHABLE();
}
zend_throw_exception_ex(zend_ce_compile_error, 0,
"Cannot use the %s modifier on a %s", zend_modifier_token_to_string(token), member);
return 0;
}
uint32_t zend_modifier_list_to_flags(zend_modifier_target target, zend_ast *modifiers)
{
uint32_t flags = 0;
zend_ast_list *modifier_list = zend_ast_get_list(modifiers);
for (uint32_t i = 0; i < modifier_list->children; i++) {
uint32_t token = (uint32_t) Z_LVAL_P(zend_ast_get_zval(modifier_list->child[i]));
uint32_t new_flag = zend_modifier_token_to_flag(target, token);
if (!new_flag) {
return 0;
}
/* Don't error immediately for duplicate flags, we want to prioritize the errors from zend_add_member_modifier(). */
bool duplicate_flag = (flags & new_flag);
flags = zend_add_member_modifier(flags, new_flag, target);
if (!flags) {
return 0;
}
if (duplicate_flag) {
zend_throw_exception_ex(zend_ce_compile_error, 0,
"Multiple %s modifiers are not allowed", zend_modifier_token_to_string(token));
return 0;
}
}
return flags;
}
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_throw_exception(zend_ce_compile_error,
"Multiple abstract modifiers are not allowed", 0);
return 0;
}
if ((flags & ZEND_ACC_FINAL) && (new_flag & ZEND_ACC_FINAL)) {
zend_throw_exception(zend_ce_compile_error, "Multiple final modifiers are not allowed", 0);
return 0;
}
if ((flags & ZEND_ACC_READONLY_CLASS) && (new_flag & ZEND_ACC_READONLY_CLASS)) {
zend_throw_exception(zend_ce_compile_error, "Multiple readonly modifiers are not allowed", 0);
return 0;
}
if ((new_flags & ZEND_ACC_EXPLICIT_ABSTRACT_CLASS) && (new_flags & ZEND_ACC_FINAL)) {
zend_throw_exception(zend_ce_compile_error,
"Cannot use the final modifier on an abstract class", 0);