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php-src/Zend/zend_execute.h
Anatol Belski 3affc0e8a2 Fixed bug #68583 Crash in timeout thread 
This replaces the GUI element used for execution timeout handling
on Windows. Instead a timer queue technique is used, which is indeed
a thread pool. A timer queue timer is a lightweight object handled
but that thread pool and the timer thread spends most of the time
sleeping and waiting for an alert.

Please note also that this introduces neither binary nor source
breach. The custom timeout thread functions are deleted, however
they was not exported throug DLL, so couldn't be used by any
external code. As well they couldn't be used anywhere in the core
except in executor api, because those custom timeout thread
functions they used to operate on static variables which would
be overwritten (and that would blow).

So instead a relatively modern technique is used for the timeout
handling. It's still not perfect because the executor still has to
check EX(timed_out). This can be a topic for an improvement in
master. But brobably can be tricky as currently it seems to be not
possible to signal an individual thread. Also note another issue
that static variables aren't thread safe, but the current timer
implementation is.
2014-12-12 10:43:31 +01:00

419 lines
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/*
+----------------------------------------------------------------------+
| Zend Engine |
+----------------------------------------------------------------------+
| Copyright (c) 1998-2014 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> |
+----------------------------------------------------------------------+
*/
/* $Id$ */
#ifndef ZEND_EXECUTE_H
#define ZEND_EXECUTE_H
#include "zend_compile.h"
#include "zend_hash.h"
#include "zend_operators.h"
#include "zend_variables.h"
typedef union _temp_variable {
zval tmp_var;
struct {
zval **ptr_ptr;
zval *ptr;
zend_bool fcall_returned_reference;
} var;
struct {
zval **ptr_ptr; /* shared with var.ptr_ptr */
zval *str;
zend_uint offset;
} str_offset;
struct {
zval **ptr_ptr; /* shared with var.ptr_ptr */
zval *ptr; /* shared with var.ptr */
HashPointer fe_pos;
} fe;
zend_class_entry *class_entry;
} temp_variable;
BEGIN_EXTERN_C()
struct _zend_fcall_info;
ZEND_API extern void (*zend_execute_ex)(zend_execute_data *execute_data TSRMLS_DC);
ZEND_API extern void (*zend_execute_internal)(zend_execute_data *execute_data_ptr, struct _zend_fcall_info *fci, int return_value_used TSRMLS_DC);
void init_executor(TSRMLS_D);
void shutdown_executor(TSRMLS_D);
void shutdown_destructors(TSRMLS_D);
zend_execute_data *zend_create_execute_data_from_op_array(zend_op_array *op_array, zend_bool nested TSRMLS_DC);
ZEND_API void zend_execute(zend_op_array *op_array TSRMLS_DC);
ZEND_API void execute_ex(zend_execute_data *execute_data TSRMLS_DC);
ZEND_API void execute_internal(zend_execute_data *execute_data_ptr, struct _zend_fcall_info *fci, int return_value_used TSRMLS_DC);
ZEND_API int zend_is_true(zval *op);
ZEND_API int zend_lookup_class(const char *name, int name_length, zend_class_entry ***ce TSRMLS_DC);
ZEND_API int zend_lookup_class_ex(const char *name, int name_length, const zend_literal *key, int use_autoload, zend_class_entry ***ce TSRMLS_DC);
ZEND_API int zend_eval_string(char *str, zval *retval_ptr, char *string_name TSRMLS_DC);
ZEND_API int zend_eval_stringl(char *str, int str_len, zval *retval_ptr, char *string_name TSRMLS_DC);
ZEND_API int zend_eval_string_ex(char *str, zval *retval_ptr, char *string_name, int handle_exceptions TSRMLS_DC);
ZEND_API int zend_eval_stringl_ex(char *str, int str_len, zval *retval_ptr, char *string_name, int handle_exceptions TSRMLS_DC);
ZEND_API char * zend_verify_arg_class_kind(const zend_arg_info *cur_arg_info, ulong fetch_type, const char **class_name, zend_class_entry **pce TSRMLS_DC);
ZEND_API int zend_verify_arg_error(int error_type, const zend_function *zf, zend_uint arg_num, const char *need_msg, const char *need_kind, const char *given_msg, const char *given_kind TSRMLS_DC);
static zend_always_inline void i_zval_ptr_dtor(zval *zval_ptr ZEND_FILE_LINE_DC)
{
if (!Z_DELREF_P(zval_ptr)) {
TSRMLS_FETCH();
ZEND_ASSERT(zval_ptr != &EG(uninitialized_zval));
GC_REMOVE_ZVAL_FROM_BUFFER(zval_ptr);
zval_dtor(zval_ptr);
efree_rel(zval_ptr);
} else {
TSRMLS_FETCH();
if (Z_REFCOUNT_P(zval_ptr) == 1) {
Z_UNSET_ISREF_P(zval_ptr);
}
GC_ZVAL_CHECK_POSSIBLE_ROOT(zval_ptr);
}
}
static zend_always_inline int i_zend_is_true(zval *op)
{
int result;
switch (Z_TYPE_P(op)) {
case IS_NULL:
result = 0;
break;
case IS_LONG:
case IS_BOOL:
case IS_RESOURCE:
result = (Z_LVAL_P(op)?1:0);
break;
case IS_DOUBLE:
result = (Z_DVAL_P(op) ? 1 : 0);
break;
case IS_STRING:
if (Z_STRLEN_P(op) == 0
|| (Z_STRLEN_P(op)==1 && Z_STRVAL_P(op)[0]=='0')) {
result = 0;
} else {
result = 1;
}
break;
case IS_ARRAY:
result = (zend_hash_num_elements(Z_ARRVAL_P(op))?1:0);
break;
case IS_OBJECT:
if(IS_ZEND_STD_OBJECT(*op)) {
TSRMLS_FETCH();
if (Z_OBJ_HT_P(op)->cast_object) {
zval tmp;
if (Z_OBJ_HT_P(op)->cast_object(op, &tmp, IS_BOOL TSRMLS_CC) == SUCCESS) {
result = Z_LVAL(tmp);
break;
}
} else if (Z_OBJ_HT_P(op)->get) {
zval *tmp = Z_OBJ_HT_P(op)->get(op TSRMLS_CC);
if(Z_TYPE_P(tmp) != IS_OBJECT) {
/* for safety - avoid loop */
convert_to_boolean(tmp);
result = Z_LVAL_P(tmp);
zval_ptr_dtor(&tmp);
break;
}
}
}
result = 1;
break;
default:
result = 0;
break;
}
return result;
}
ZEND_API int zval_update_constant(zval **pp, void *arg TSRMLS_DC);
ZEND_API int zval_update_constant_inline_change(zval **pp, void *arg TSRMLS_DC);
ZEND_API int zval_update_constant_no_inline_change(zval **pp, void *arg TSRMLS_DC);
ZEND_API int zval_update_constant_ex(zval **pp, void *arg, zend_class_entry *scope TSRMLS_DC);
/* dedicated Zend executor functions - do not use! */
#define ZEND_VM_STACK_PAGE_SIZE ((16 * 1024) - 16)
struct _zend_vm_stack {
void **top;
void **end;
zend_vm_stack prev;
};
#define ZEND_VM_STACK_ELEMETS(stack) \
((void**)(((char*)(stack)) + ZEND_MM_ALIGNED_SIZE(sizeof(struct _zend_vm_stack))))
#define ZEND_VM_STACK_GROW_IF_NEEDED(count) \
do { \
if (UNEXPECTED((count) > \
EG(argument_stack)->end - EG(argument_stack)->top)) { \
zend_vm_stack_extend((count) TSRMLS_CC); \
} \
} while (0)
static zend_always_inline zend_vm_stack zend_vm_stack_new_page(int count) {
zend_vm_stack page = (zend_vm_stack)emalloc(ZEND_MM_ALIGNED_SIZE(sizeof(*page)) + sizeof(void*) * count);
page->top = ZEND_VM_STACK_ELEMETS(page);
page->end = page->top + count;
page->prev = NULL;
return page;
}
static zend_always_inline void zend_vm_stack_init(TSRMLS_D)
{
EG(argument_stack) = zend_vm_stack_new_page(ZEND_VM_STACK_PAGE_SIZE);
}
static zend_always_inline void zend_vm_stack_destroy(TSRMLS_D)
{
zend_vm_stack stack = EG(argument_stack);
while (stack != NULL) {
zend_vm_stack p = stack->prev;
efree(stack);
stack = p;
}
}
static zend_always_inline void zend_vm_stack_extend(int count TSRMLS_DC)
{
zend_vm_stack p = zend_vm_stack_new_page(count >= ZEND_VM_STACK_PAGE_SIZE ? count : ZEND_VM_STACK_PAGE_SIZE);
p->prev = EG(argument_stack);
EG(argument_stack) = p;
}
static zend_always_inline void **zend_vm_stack_top(TSRMLS_D)
{
return EG(argument_stack)->top;
}
static zend_always_inline void zend_vm_stack_push(void *ptr TSRMLS_DC)
{
*(EG(argument_stack)->top++) = ptr;
}
static zend_always_inline void *zend_vm_stack_pop(TSRMLS_D)
{
void *el = *(--EG(argument_stack)->top);
return el;
}
static zend_always_inline void *zend_vm_stack_alloc(size_t size TSRMLS_DC)
{
void *ret;
size = (size + (sizeof(void*) - 1)) / sizeof(void*);
/* the following comparison must be optimized out at compile time */
if (ZEND_MM_ALIGNMENT > sizeof(void*)) {
int extra = (ZEND_MM_ALIGNMENT - ((zend_uintptr_t)EG(argument_stack)->top & (ZEND_MM_ALIGNMENT - 1))) / sizeof(void*);
if (UNEXPECTED(size + extra + ZEND_MM_ALIGNED_SIZE(sizeof(void*)) / sizeof(void*) >
(zend_uintptr_t)(EG(argument_stack)->end - EG(argument_stack)->top))) {
zend_vm_stack_extend(size TSRMLS_CC);
} else {
void **old_top = EG(argument_stack)->top;
EG(argument_stack)->top += extra;
/* store old top on the stack */
*EG(argument_stack)->top = (void*)old_top;
EG(argument_stack)->top += ZEND_MM_ALIGNED_SIZE(sizeof(void*)) / sizeof(void*);
}
} else {
ZEND_VM_STACK_GROW_IF_NEEDED((int)size);
}
ret = (void*)EG(argument_stack)->top;
EG(argument_stack)->top += size;
return ret;
}
static zend_always_inline void** zend_vm_stack_frame_base(zend_execute_data *ex)
{
return (void**)((char*)ex->call_slots +
ZEND_MM_ALIGNED_SIZE(sizeof(call_slot)) * ex->op_array->nested_calls);
}
static zend_always_inline void zend_vm_stack_free_int(void *ptr TSRMLS_DC)
{
if (UNEXPECTED(ZEND_VM_STACK_ELEMETS(EG(argument_stack)) == (void**)ptr)) {
zend_vm_stack p = EG(argument_stack);
EG(argument_stack) = p->prev;
efree(p);
} else {
EG(argument_stack)->top = (void**)ptr;
}
}
static zend_always_inline void zend_vm_stack_free(void *ptr TSRMLS_DC)
{
if (UNEXPECTED(ZEND_VM_STACK_ELEMETS(EG(argument_stack)) == (void**)ptr)) {
zend_vm_stack p = EG(argument_stack);
EG(argument_stack) = p->prev;
efree(p);
} else {
/* the following comparison must be optimized out at compile time */
if (ZEND_MM_ALIGNMENT > sizeof(void*)) {
ptr = (void*)(((char*)ptr) - ZEND_MM_ALIGNED_SIZE(sizeof(void*)));
EG(argument_stack)->top = *(void***)ptr;
} else {
EG(argument_stack)->top = (void**)ptr;
}
}
}
static zend_always_inline void zend_vm_stack_clear_multiple(int nested TSRMLS_DC)
{
void **p = EG(argument_stack)->top - 1;
void **end = p - (int)(zend_uintptr_t)*p;
while (p != end) {
zval *q = (zval *) *(--p);
*p = NULL;
i_zval_ptr_dtor(q ZEND_FILE_LINE_CC);
}
if (nested) {
EG(argument_stack)->top = p;
} else {
zend_vm_stack_free_int(p TSRMLS_CC);
}
}
static zend_always_inline int zend_vm_stack_get_args_count_ex(zend_execute_data *ex)
{
if (ex) {
void **p = ex->function_state.arguments;
return (int)(zend_uintptr_t) *p;
} else {
return 0;
}
}
static zend_always_inline zval** zend_vm_stack_get_arg_ex(zend_execute_data *ex, int requested_arg)
{
void **p = ex->function_state.arguments;
int arg_count = (int)(zend_uintptr_t) *p;
if (UNEXPECTED(requested_arg > arg_count)) {
return NULL;
}
return (zval**)p - arg_count + requested_arg - 1;
}
static zend_always_inline int zend_vm_stack_get_args_count(TSRMLS_D)
{
return zend_vm_stack_get_args_count_ex(EG(current_execute_data)->prev_execute_data);
}
static zend_always_inline zval** zend_vm_stack_get_arg(int requested_arg TSRMLS_DC)
{
return zend_vm_stack_get_arg_ex(EG(current_execute_data)->prev_execute_data, requested_arg);
}
void execute_new_code(TSRMLS_D);
/* services */
ZEND_API const char *get_active_class_name(const char **space TSRMLS_DC);
ZEND_API const char *get_active_function_name(TSRMLS_D);
ZEND_API const char *zend_get_executed_filename(TSRMLS_D);
ZEND_API uint zend_get_executed_lineno(TSRMLS_D);
ZEND_API zend_bool zend_is_executing(TSRMLS_D);
ZEND_API void zend_set_timeout(long seconds, int reset_signals);
ZEND_API void zend_unset_timeout(TSRMLS_D);
ZEND_API void zend_timeout(int dummy);
ZEND_API zend_class_entry *zend_fetch_class(const char *class_name, uint class_name_len, int fetch_type TSRMLS_DC);
ZEND_API zend_class_entry *zend_fetch_class_by_name(const char *class_name, uint class_name_len, const zend_literal *key, int fetch_type TSRMLS_DC);
void zend_verify_abstract_class(zend_class_entry *ce TSRMLS_DC);
#define zendi_zval_copy_ctor(p) zval_copy_ctor(&(p))
#define zendi_zval_dtor(p) zval_dtor(&(p))
#define active_opline (*EG(opline_ptr))
/* The following tries to resolve the classname of a zval of type object.
* Since it is slow it should be only used in error messages.
*/
#define Z_OBJ_CLASS_NAME_P(zval) ((zval) && Z_TYPE_P(zval) == IS_OBJECT && Z_OBJ_HT_P(zval)->get_class_entry != NULL && Z_OBJ_HT_P(zval)->get_class_entry(zval TSRMLS_CC) ? Z_OBJ_HT_P(zval)->get_class_entry(zval TSRMLS_CC)->name : "")
ZEND_API zval** zend_get_compiled_variable_value(const zend_execute_data *execute_data_ptr, zend_uint 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 struct _zend_free_op {
zval* var;
/* int is_var; */
} 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 TSRMLS_DC);
ZEND_API zval **zend_get_zval_ptr_ptr(int op_type, const znode_op *node, const zend_execute_data *execute_data, zend_free_op *should_free, int type TSRMLS_DC);
ZEND_API int zend_do_fcall(ZEND_OPCODE_HANDLER_ARGS);
void zend_clean_and_cache_symbol_table(HashTable *symbol_table TSRMLS_DC);
void zend_free_compiled_variables(zend_execute_data *execute_data);
#define CACHED_PTR(num) \
EG(active_op_array)->run_time_cache[(num)]
#define CACHE_PTR(num, ptr) do { \
EG(active_op_array)->run_time_cache[(num)] = (ptr); \
} while (0)
#define CACHED_POLYMORPHIC_PTR(num, ce) \
((EG(active_op_array)->run_time_cache[(num)] == (ce)) ? \
EG(active_op_array)->run_time_cache[(num) + 1] : \
NULL)
#define CACHE_POLYMORPHIC_PTR(num, ce, ptr) do { \
EG(active_op_array)->run_time_cache[(num)] = (ce); \
EG(active_op_array)->run_time_cache[(num) + 1] = (ptr); \
} while (0)
END_EXTERN_C()
#endif /* ZEND_EXECUTE_H */
/*
* Local variables:
* tab-width: 4
* c-basic-offset: 4
* indent-tabs-mode: t
* End:
*/
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