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/*
+----------------------------------------------------------------------+
| Zend Engine |
+----------------------------------------------------------------------+
| Copyright (c) 1998-2018 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> |
| Dmitry Stogov <dmitry@zend.com> |
+----------------------------------------------------------------------+
*/
/* $Id$ */
#ifndef ZEND_EXECUTE_H
#define ZEND_EXECUTE_H
#include "zend_compile.h"
#include "zend_hash.h"
#include "zend_operators.h"
#include "zend_variables.h"
BEGIN_EXTERN_C()
struct _zend_fcall_info;
ZEND_API extern void (*zend_execute_ex)(zend_execute_data *execute_data);
ZEND_API extern void (*zend_execute_internal)(zend_execute_data *execute_data, zval *return_value);
void init_executor(void);
void shutdown_executor(void);
void shutdown_destructors(void);
ZEND_API void zend_init_execute_data(zend_execute_data *execute_data, zend_op_array *op_array, zval *return_value);
ZEND_API void zend_init_func_execute_data(zend_execute_data *execute_data, zend_op_array *op_array, zval *return_value);
ZEND_API void zend_init_code_execute_data(zend_execute_data *execute_data, zend_op_array *op_array, zval *return_value);
ZEND_API void zend_execute(zend_op_array *op_array, zval *return_value);
ZEND_API void execute_ex(zend_execute_data *execute_data);
ZEND_API void execute_internal(zend_execute_data *execute_data, zval *return_value);
ZEND_API zend_class_entry *zend_lookup_class(zend_string *name);
ZEND_API zend_class_entry *zend_lookup_class_ex(zend_string *name, const zval *key, int use_autoload);
ZEND_API zend_class_entry *zend_get_called_scope(zend_execute_data *ex);
ZEND_API zend_object *zend_get_this_object(zend_execute_data *ex);
ZEND_API int zend_eval_string(char *str, zval *retval_ptr, char *string_name);
ZEND_API int zend_eval_stringl(char *str, size_t str_len, zval *retval_ptr, char *string_name);
ZEND_API int zend_eval_string_ex(char *str, zval *retval_ptr, char *string_name, int handle_exceptions);
ZEND_API int zend_eval_stringl_ex(char *str, size_t str_len, zval *retval_ptr, char *string_name, int handle_exceptions);
/* export zend_pass_function to allow comparisons against it */
extern ZEND_API const zend_internal_function zend_pass_function;
ZEND_API void ZEND_FASTCALL zend_check_internal_arg_type(zend_function *zf, uint32_t arg_num, zval *arg);
ZEND_API int ZEND_FASTCALL zend_check_arg_type(zend_function *zf, uint32_t arg_num, zval *arg, zval *default_value, void **cache_slot);
ZEND_API ZEND_COLD void ZEND_FASTCALL zend_missing_arg_error(zend_execute_data *execute_data);
static zend_always_inline zval* zend_assign_to_variable(zval *variable_ptr, zval *value, zend_uchar value_type)
{
zend_refcounted *ref = NULL;
if (ZEND_CONST_COND(value_type & (IS_VAR|IS_CV), 1) && Z_ISREF_P(value)) {
ref = Z_COUNTED_P(value);
value = Z_REFVAL_P(value);
}
do {
if (UNEXPECTED(Z_REFCOUNTED_P(variable_ptr))) {
zend_refcounted *garbage;
if (Z_ISREF_P(variable_ptr)) {
variable_ptr = Z_REFVAL_P(variable_ptr);
if (EXPECTED(!Z_REFCOUNTED_P(variable_ptr))) {
break;
}
}
if (Z_TYPE_P(variable_ptr) == IS_OBJECT &&
UNEXPECTED(Z_OBJ_HANDLER_P(variable_ptr, set) != NULL)) {
Z_OBJ_HANDLER_P(variable_ptr, set)(variable_ptr, value);
return variable_ptr;
}
if (ZEND_CONST_COND(value_type & (IS_VAR|IS_CV), 1) && variable_ptr == value) {
if (value_type == IS_VAR && ref) {
ZEND_ASSERT(GC_REFCOUNT(ref) > 1);
--GC_REFCOUNT(ref);
}
return variable_ptr;
}
garbage = Z_COUNTED_P(variable_ptr);
if (--GC_REFCOUNT(garbage) == 0) {
ZVAL_COPY_VALUE(variable_ptr, value);
if (value_type & (IS_CONST|IS_CV)) {
if (UNEXPECTED(Z_OPT_REFCOUNTED_P(variable_ptr))) {
Z_ADDREF_P(variable_ptr);
}
} else if (ZEND_CONST_COND(value_type == IS_VAR, 1) && UNEXPECTED(ref)) {
if (UNEXPECTED(--GC_REFCOUNT(ref) == 0)) {
efree_size(ref, sizeof(zend_reference));
} else if (Z_OPT_REFCOUNTED_P(variable_ptr)) {
Z_ADDREF_P(variable_ptr);
}
}
zval_dtor_func(garbage);
return variable_ptr;
} else { /* we need to split */
/* optimized version of GC_ZVAL_CHECK_POSSIBLE_ROOT(variable_ptr) */
if (UNEXPECTED(GC_MAY_LEAK(garbage))) {
gc_possible_root(garbage);
}
}
}
} while (0);
ZVAL_COPY_VALUE(variable_ptr, value);
if (value_type & (IS_CONST|IS_CV)) {
if (UNEXPECTED(Z_OPT_REFCOUNTED_P(variable_ptr))) {
Z_ADDREF_P(variable_ptr);
}
} else if (ZEND_CONST_COND(value_type == IS_VAR, 1) && UNEXPECTED(ref)) {
if (UNEXPECTED(--GC_REFCOUNT(ref) == 0)) {
efree_size(ref, sizeof(zend_reference));
} else if (Z_OPT_REFCOUNTED_P(variable_ptr)) {
Z_ADDREF_P(variable_ptr);
}
}
return variable_ptr;
}
ZEND_API int zval_update_constant(zval *pp);
ZEND_API int zval_update_constant_ex(zval *pp, zend_class_entry *scope);
/* dedicated Zend executor functions - do not use! */
struct _zend_vm_stack {
zval *top;
zval *end;
zend_vm_stack prev;
};
#define ZEND_VM_STACK_HEADER_SLOTS \
((ZEND_MM_ALIGNED_SIZE(sizeof(struct _zend_vm_stack)) + ZEND_MM_ALIGNED_SIZE(sizeof(zval)) - 1) / ZEND_MM_ALIGNED_SIZE(sizeof(zval)))
#define ZEND_VM_STACK_ELEMENTS(stack) \
(((zval*)(stack)) + ZEND_VM_STACK_HEADER_SLOTS)
/*
* In general in RELEASE build ZEND_ASSERT() must be zero-cost, but for some
* reason, GCC generated worse code, performing CSE on assertion code and the
* following "slow path" and moving memory read operatins from slow path into
* common header. This made a degradation for the fast path.
* The following "#if ZEND_DEBUG" eliminates it.
*/
#if ZEND_DEBUG
# define ZEND_ASSERT_VM_STACK(stack) ZEND_ASSERT(stack->top > (zval *) stack && stack->end > (zval *) stack && stack->top <= stack->end)
# define ZEND_ASSERT_VM_STACK_GLOBAL ZEND_ASSERT(EG(vm_stack_top) > (zval *) EG(vm_stack) && EG(vm_stack_end) > (zval *) EG(vm_stack) && EG(vm_stack_top) <= EG(vm_stack_end))
#else
# define ZEND_ASSERT_VM_STACK(stack)
# define ZEND_ASSERT_VM_STACK_GLOBAL
#endif
ZEND_API void zend_vm_stack_init(void);
ZEND_API void zend_vm_stack_destroy(void);
ZEND_API void* zend_vm_stack_extend(size_t size);
static zend_always_inline void zend_vm_init_call_frame(zend_execute_data *call, uint32_t call_info, zend_function *func, uint32_t num_args, zend_class_entry *called_scope, zend_object *object)
{
call->func = func;
if (object) {
Z_OBJ(call->This) = object;
ZEND_SET_CALL_INFO(call, 1, call_info);
} else {
Z_CE(call->This) = called_scope;
ZEND_SET_CALL_INFO(call, 0, call_info);
}
ZEND_CALL_NUM_ARGS(call) = num_args;
}
static zend_always_inline zend_execute_data *zend_vm_stack_push_call_frame_ex(uint32_t used_stack, uint32_t call_info, zend_function *func, uint32_t num_args, zend_class_entry *called_scope, zend_object *object)
{
zend_execute_data *call = (zend_execute_data*)EG(vm_stack_top);
ZEND_ASSERT_VM_STACK_GLOBAL;
if (UNEXPECTED(used_stack > (size_t)(((char*)EG(vm_stack_end)) - (char*)call))) {
call = (zend_execute_data*)zend_vm_stack_extend(used_stack);
ZEND_ASSERT_VM_STACK_GLOBAL;
zend_vm_init_call_frame(call, call_info | ZEND_CALL_ALLOCATED, func, num_args, called_scope, object);
return call;
} else {
EG(vm_stack_top) = (zval*)((char*)call + used_stack);
zend_vm_init_call_frame(call, call_info, func, num_args, called_scope, object);
return call;
}
}
static zend_always_inline uint32_t zend_vm_calc_used_stack(uint32_t num_args, zend_function *func)
{
uint32_t used_stack = ZEND_CALL_FRAME_SLOT + num_args;
if (EXPECTED(ZEND_USER_CODE(func->type))) {
used_stack += func->op_array.last_var + func->op_array.T - MIN(func->op_array.num_args, num_args);
}
return used_stack * sizeof(zval);
}
static zend_always_inline zend_execute_data *zend_vm_stack_push_call_frame(uint32_t call_info, zend_function *func, uint32_t num_args, zend_class_entry *called_scope, zend_object *object)
{
uint32_t used_stack = zend_vm_calc_used_stack(num_args, func);
return zend_vm_stack_push_call_frame_ex(used_stack, call_info,
func, num_args, called_scope, object);
}
static zend_always_inline void zend_vm_stack_free_extra_args_ex(uint32_t call_info, zend_execute_data *call)
{
if (UNEXPECTED(call_info & ZEND_CALL_FREE_EXTRA_ARGS)) {
zval *end = ZEND_CALL_VAR_NUM(call, call->func->op_array.last_var + call->func->op_array.T);
zval *p = end + (ZEND_CALL_NUM_ARGS(call) - call->func->op_array.num_args);
do {
p--;
if (Z_REFCOUNTED_P(p)) {
zend_refcounted *r = Z_COUNTED_P(p);
if (!--GC_REFCOUNT(r)) {
ZVAL_NULL(p);
zval_dtor_func(r);
} else {
gc_check_possible_root(r);
}
}
} while (p != end);
}
}
static zend_always_inline void zend_vm_stack_free_extra_args(zend_execute_data *call)
{
zend_vm_stack_free_extra_args_ex(ZEND_CALL_INFO(call), call);
}
static zend_always_inline void zend_vm_stack_free_args(zend_execute_data *call)
{
uint32_t num_args = ZEND_CALL_NUM_ARGS(call);
if (EXPECTED(num_args > 0)) {
zval *end = ZEND_CALL_ARG(call, 1);
zval *p = end + num_args;
do {
p--;
if (Z_REFCOUNTED_P(p)) {
if (!Z_DELREF_P(p)) {
zend_refcounted *r = Z_COUNTED_P(p);
ZVAL_NULL(p);
zval_dtor_func(r);
}
}
} while (p != end);
}
}
static zend_always_inline void zend_vm_stack_free_call_frame_ex(uint32_t call_info, zend_execute_data *call)
{
ZEND_ASSERT_VM_STACK_GLOBAL;
if (UNEXPECTED(call_info & ZEND_CALL_ALLOCATED)) {
zend_vm_stack p = EG(vm_stack);
zend_vm_stack prev = p->prev;
ZEND_ASSERT(call == (zend_execute_data*)ZEND_VM_STACK_ELEMENTS(EG(vm_stack)));
EG(vm_stack_top) = prev->top;
EG(vm_stack_end) = prev->end;
EG(vm_stack) = prev;
efree(p);
} else {
EG(vm_stack_top) = (zval*)call;
}
ZEND_ASSERT_VM_STACK_GLOBAL;
}
static zend_always_inline void zend_vm_stack_free_call_frame(zend_execute_data *call)
{
zend_vm_stack_free_call_frame_ex(ZEND_CALL_INFO(call), call);
}
/* services */
ZEND_API const char *get_active_class_name(const char **space);
ZEND_API const char *get_active_function_name(void);
ZEND_API const char *zend_get_executed_filename(void);
ZEND_API zend_string *zend_get_executed_filename_ex(void);
ZEND_API uint32_t zend_get_executed_lineno(void);
ZEND_API zend_class_entry *zend_get_executed_scope(void);
ZEND_API zend_bool zend_is_executing(void);
ZEND_API void zend_set_timeout(zend_long seconds, int reset_signals);
ZEND_API void zend_unset_timeout(void);
ZEND_API ZEND_NORETURN void zend_timeout(int dummy);
ZEND_API zend_class_entry *zend_fetch_class(zend_string *class_name, int fetch_type);
ZEND_API zend_class_entry *zend_fetch_class_by_name(zend_string *class_name, const zval *key, int fetch_type);
void zend_verify_abstract_class(zend_class_entry *ce);
ZEND_API void zend_fetch_dimension_const(zval *result, zval *container, zval *dim, int type);
ZEND_API zval* zend_get_compiled_variable_value(const zend_execute_data *execute_data_ptr, uint32_t var);
#define ZEND_USER_OPCODE_CONTINUE 0 /* execute next opcode */
#define ZEND_USER_OPCODE_RETURN 1 /* exit from executor (return from function) */
#define ZEND_USER_OPCODE_DISPATCH 2 /* call original opcode handler */
#define ZEND_USER_OPCODE_ENTER 3 /* enter into new op_array without recursion */
#define ZEND_USER_OPCODE_LEAVE 4 /* return to calling op_array within the same executor */
#define ZEND_USER_OPCODE_DISPATCH_TO 0x100 /* call original handler of returned opcode */
ZEND_API int zend_set_user_opcode_handler(zend_uchar opcode, user_opcode_handler_t handler);
ZEND_API user_opcode_handler_t zend_get_user_opcode_handler(zend_uchar opcode);
/* former zend_execute_locks.h */
typedef zval* zend_free_op;
ZEND_API zval *zend_get_zval_ptr(int op_type, const znode_op *node, const zend_execute_data *execute_data, zend_free_op *should_free, int type);
ZEND_API void zend_clean_and_cache_symbol_table(zend_array *symbol_table);
void zend_free_compiled_variables(zend_execute_data *execute_data);
void zend_cleanup_unfinished_execution(zend_execute_data *execute_data, uint32_t op_num, uint32_t catch_op_num);
ZEND_API int ZEND_FASTCALL zend_do_fcall_overloaded(zend_execute_data *call, zval *ret);
#define CACHE_ADDR(num) \
((void**)((char*)EX_RUN_TIME_CACHE() + (num)))
#define CACHED_PTR(num) \
((void**)((char*)EX_RUN_TIME_CACHE() + (num)))[0]
#define CACHE_PTR(num, ptr) do { \
((void**)((char*)EX_RUN_TIME_CACHE() + (num)))[0] = (ptr); \
} while (0)
#define CACHED_POLYMORPHIC_PTR(num, ce) \
(EXPECTED(((void**)((char*)EX_RUN_TIME_CACHE() + (num)))[0] == (void*)(ce)) ? \
((void**)((char*)EX_RUN_TIME_CACHE() + (num)))[1] : \
NULL)
#define CACHE_POLYMORPHIC_PTR(num, ce, ptr) do { \
void **slot = (void**)((char*)EX_RUN_TIME_CACHE() + (num)); \
slot[0] = (ce); \
slot[1] = (ptr); \
} while (0)
#define CACHED_PTR_EX(slot) \
(slot)[0]
#define CACHE_PTR_EX(slot, ptr) do { \
(slot)[0] = (ptr); \
} while (0)
#define CACHED_POLYMORPHIC_PTR_EX(slot, ce) \
(EXPECTED((slot)[0] == (ce)) ? (slot)[1] : NULL)
#define CACHE_POLYMORPHIC_PTR_EX(slot, ce, ptr) do { \
(slot)[0] = (ce); \
(slot)[1] = (ptr); \
} while (0)
#define SKIP_EXT_OPLINE(opline) do { \
while (UNEXPECTED((opline)->opcode >= ZEND_EXT_STMT \
&& (opline)->opcode <= ZEND_TICKS)) { \
(opline)--; \
} \
} while (0)
END_EXTERN_C()
#endif /* ZEND_EXECUTE_H */
/*
* Local variables:
* tab-width: 4
* c-basic-offset: 4
* indent-tabs-mode: t
* End:
* vim600: sw=4 ts=4 fdm=marker
* vim<600: sw=4 ts=4
*/
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