php-src/Zend/zend_execute_API.c

709 lines
18 KiB
C

/*
+----------------------------------------------------------------------+
| Zend Engine |
+----------------------------------------------------------------------+
| Copyright (c) 1998-2000 Zend Technologies Ltd. (http://www.zend.com) |
+----------------------------------------------------------------------+
| This source file is subject to version 0.92 of the Zend license, |
| that is bundled with this package in the file LICENSE, and is |
| available at through the world-wide-web at |
| http://www.zend.com/license/0_92.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> |
+----------------------------------------------------------------------+
*/
#include <stdio.h>
#include <signal.h>
#include "zend.h"
#include "zend_compile.h"
#include "zend_execute.h"
#include "zend_API.h"
#include "zend_ptr_stack.h"
#include "zend_constants.h"
#include "zend_extensions.h"
#include "zend_execute_locks.h"
#if HAVE_SYS_TIME_H
#include <sys/time.h>
#endif
ZEND_API void (*zend_execute)(zend_op_array *op_array ELS_DC);
#ifdef ZEND_WIN32
#include <process.h>
/* true global */
static WNDCLASS wc;
static HWND timeout_window;
static HANDLE timeout_thread_event;
static DWORD timeout_thread_id;
static int timeout_thread_initialized=0;
#endif
#if ZEND_DEBUG
static void (*original_sigsegv_handler)(int);
static void zend_handle_sigsegv(int dummy)
{
fflush(stdout);
fflush(stderr);
if (original_sigsegv_handler==zend_handle_sigsegv) {
signal(SIGSEGV, original_sigsegv_handler);
} else {
signal(SIGSEGV, SIG_DFL);
}
{
ELS_FETCH();
fprintf(stderr, "SIGSEGV caught on opcode %d on opline %d of %s() at %s:%d\n\n",
active_opline->opcode,
active_opline-EG(active_op_array)->opcodes,
get_active_function_name(),
zend_get_executed_filename(ELS_C),
zend_get_executed_lineno(ELS_C));
}
if (original_sigsegv_handler!=zend_handle_sigsegv) {
original_sigsegv_handler(dummy);
}
}
#endif
static void zend_extension_activator(zend_extension *extension)
{
if (extension->activate) {
extension->activate();
}
}
static void zend_extension_deactivator(zend_extension *extension)
{
if (extension->deactivate) {
extension->deactivate();
}
}
static int is_not_internal_function(zend_function *function)
{
return(function->type != ZEND_INTERNAL_FUNCTION);
}
static int is_not_internal_class(zend_class_entry *ce)
{
return(ce->type != ZEND_INTERNAL_CLASS);
}
void init_executor(CLS_D ELS_DC)
{
INIT_ZVAL(EG(uninitialized_zval));
INIT_ZVAL(EG(error_zval));
EG(uninitialized_zval_ptr)=&EG(uninitialized_zval);
EG(error_zval_ptr)=&EG(error_zval);
zend_ptr_stack_init(&EG(arg_types_stack));
/* destroys stack frame, therefore makes core dumps worthless */
#if 0&&ZEND_DEBUG
original_sigsegv_handler = signal(SIGSEGV, zend_handle_sigsegv);
#endif
EG(return_value_ptr_ptr) = &EG(global_return_value_ptr);
EG(global_return_value_ptr) = NULL;
EG(symtable_cache_ptr) = EG(symtable_cache)-1;
EG(symtable_cache_limit)=EG(symtable_cache)+SYMTABLE_CACHE_SIZE-1;
EG(no_extensions)=0;
EG(function_table) = CG(function_table);
EG(class_table) = CG(class_table);
EG(in_execution) = 0;
zend_ptr_stack_init(&EG(argument_stack));
zend_hash_init(&EG(symbol_table), 50, NULL, ZVAL_PTR_DTOR, 0);
EG(active_symbol_table) = &EG(symbol_table);
zend_llist_apply(&zend_extensions, (void (*)(void *)) zend_extension_activator);
EG(opline_ptr) = NULL;
EG(garbage_ptr) = 0;
zend_hash_init(&EG(included_files), 5, NULL, NULL, 0);
EG(ticks_count) = 0;
EG(user_error_handler) = NULL;
zend_ptr_stack_init(&EG(user_error_handlers));
EG(orig_error_reporting) = EG(error_reporting);
#ifdef ZEND_WIN32
EG(timed_out) = 0;
#endif
}
void shutdown_executor(ELS_D)
{
zend_ptr_stack_destroy(&EG(arg_types_stack));
while (EG(symtable_cache_ptr)>=EG(symtable_cache)) {
zend_hash_destroy(*EG(symtable_cache_ptr));
efree(*EG(symtable_cache_ptr));
EG(symtable_cache_ptr)--;
}
zend_llist_apply(&zend_extensions, (void (*)(void *)) zend_extension_deactivator);
zend_hash_destroy(&EG(symbol_table));
while (EG(garbage_ptr)--) {
if (EG(garbage)[EG(garbage_ptr)]->refcount==1) {
zval_ptr_dtor(&EG(garbage)[EG(garbage_ptr)]);
}
}
zend_ptr_stack_destroy(&EG(argument_stack));
/* Destroy all op arrays */
zend_hash_apply(EG(function_table), (int (*)(void *)) is_not_internal_function);
zend_hash_apply(EG(class_table), (int (*)(void *)) is_not_internal_class);
zend_destroy_rsrc_list(ELS_C); /* must be destroyed after the main symbol table and
* op arrays are destroyed.
*/
clean_non_persistent_constants();
#if ZEND_DEBUG
signal(SIGSEGV, original_sigsegv_handler);
#endif
zend_hash_destroy(&EG(included_files));
if (EG(user_error_handler)) {
zval_dtor(EG(user_error_handler));
FREE_ZVAL(EG(user_error_handler));
}
zend_ptr_stack_clean(&EG(user_error_handlers), ZVAL_DESTRUCTOR, 1);
zend_ptr_stack_destroy(&EG(user_error_handlers));
EG(error_reporting) = EG(orig_error_reporting);
}
ZEND_API char *get_active_function_name()
{
ELS_FETCH();
switch(EG(function_state_ptr)->function->type) {
case ZEND_USER_FUNCTION: {
char *function_name = ((zend_op_array *) EG(function_state_ptr)->function)->function_name;
if (function_name) {
return function_name;
} else {
return "main";
}
}
break;
case ZEND_INTERNAL_FUNCTION:
return ((zend_internal_function *) EG(function_state_ptr)->function)->function_name;
break;
default:
return NULL;
}
}
ZEND_API char *zend_get_executed_filename(ELS_D)
{
if (EG(active_op_array)) {
return EG(active_op_array)->filename;
} else {
return "[no active file]";
}
}
ZEND_API uint zend_get_executed_lineno(ELS_D)
{
if (EG(opline_ptr)) {
return active_opline->lineno;
} else {
return 0;
}
}
ZEND_API zend_bool zend_is_executing()
{
ELS_FETCH();
return EG(in_execution);
}
ZEND_API void _zval_ptr_dtor(zval **zval_ptr ZEND_FILE_LINE_DC)
{
#if DEBUG_ZEND>=2
printf("Reducing refcount for %x (%x): %d->%d\n", *zval_ptr, zval_ptr, (*zval_ptr)->refcount, (*zval_ptr)->refcount-1);
#endif
(*zval_ptr)->refcount--;
if ((*zval_ptr)->refcount==0) {
zval_dtor(*zval_ptr);
safe_free_zval_ptr(*zval_ptr);
} else if (((*zval_ptr)->refcount == 1) && ((*zval_ptr)->type != IS_OBJECT)) {
(*zval_ptr)->is_ref = 0;
}
}
ZEND_API int zend_is_true(zval *op)
{
return i_zend_is_true(op);
}
ZEND_API int zval_update_constant(zval **pp, void *arg)
{
zval *p = *pp;
zend_bool inline_change = (zend_bool) (unsigned long) arg;
if (p->type == IS_CONSTANT) {
zval c;
int refcount;
SEPARATE_ZVAL(pp);
p = *pp;
refcount = p->refcount;
if (!zend_get_constant(p->value.str.val, p->value.str.len, &c)) {
zend_error(E_NOTICE, "Use of undefined constant %s - assumed '%s'",
p->value.str.val,
p->value.str.val);
p->type = IS_STRING;
if (!inline_change) {
zval_copy_ctor(p);
}
} else {
if (inline_change) {
STR_FREE(p->value.str.val);
}
*p = c;
}
INIT_PZVAL(p);
p->refcount = refcount;
} else if (p->type == IS_CONSTANT_ARRAY) {
SEPARATE_ZVAL(pp);
p = *pp;
p->type = IS_ARRAY;
zend_hash_apply_with_argument(p->value.ht, (int (*)(void *,void *)) zval_update_constant, (void *) 1);
}
return 0;
}
int call_user_function(HashTable *function_table, zval *object, zval *function_name, zval *retval_ptr, int param_count, zval *params[])
{
zval ***params_array = (zval ***) emalloc(sizeof(zval **)*param_count);
int i;
int ex_retval;
zval *local_retval_ptr;
for (i=0; i<param_count; i++) {
params_array[i] = &params[i];
}
ex_retval = call_user_function_ex(function_table, object, function_name, &local_retval_ptr, param_count, params_array, 1, NULL);
if (local_retval_ptr) {
COPY_PZVAL_TO_ZVAL(*retval_ptr, local_retval_ptr);
} else {
INIT_ZVAL(*retval_ptr);
}
efree(params_array);
return ex_retval;
}
int call_user_function_ex(HashTable *function_table, zval *object, zval *function_name, zval **retval_ptr_ptr, int param_count, zval **params[], int no_separation, HashTable *symbol_table)
{
int i;
zval **original_return_value;
HashTable *calling_symbol_table;
zend_function_state function_state;
zend_function_state *original_function_state_ptr;
zend_op_array *original_op_array;
zend_op **original_opline_ptr;
ELS_FETCH();
*retval_ptr_ptr = NULL;
if (function_name->type==IS_ARRAY) { /* assume array($obj, $name) couple */
zval **tmp_object_ptr, **tmp_real_function_name;
if (zend_hash_index_find(function_name->value.ht, 0, (void **) &tmp_object_ptr)==FAILURE) {
return FAILURE;
}
if (zend_hash_index_find(function_name->value.ht, 1, (void **) &tmp_real_function_name)==FAILURE) {
return FAILURE;
}
function_name = *tmp_real_function_name;
SEPARATE_ZVAL_IF_NOT_REF(tmp_object_ptr);
object = *tmp_object_ptr;
object->is_ref = 1;
}
if (object) {
if (object->type != IS_OBJECT) {
return FAILURE;
}
function_table = &object->value.obj.ce->function_table;
}
if (function_name->type!=IS_STRING) {
return FAILURE;
}
original_function_state_ptr = EG(function_state_ptr);
zend_str_tolower(function_name->value.str.val, function_name->value.str.len);
if (zend_hash_find(function_table, function_name->value.str.val, function_name->value.str.len+1, (void **) &function_state.function)==FAILURE) {
return FAILURE;
}
for (i=0; i<param_count; i++) {
zval *param;
if (function_state.function->common.arg_types
&& i<function_state.function->common.arg_types[0]
&& function_state.function->common.arg_types[i+1]==BYREF_FORCE
&& !PZVAL_IS_REF(*params[i])) {
if ((*params[i])->refcount>1) {
zval *new_zval;
if (no_separation) {
return FAILURE;
}
ALLOC_ZVAL(new_zval);
*new_zval = **params[i];
zval_copy_ctor(new_zval);
new_zval->refcount = 1;
(*params[i])->refcount--;
*params[i] = new_zval;
}
(*params[i])->refcount++;
(*params[i])->is_ref = 1;
param = *params[i];
} else if (*params[i] != &EG(uninitialized_zval)) {
(*params[i])->refcount++;
param = *params[i];
} else {
ALLOC_ZVAL(param);
*param = **(params[i]);
INIT_PZVAL(param);
}
zend_ptr_stack_push(&EG(argument_stack), param);
}
zend_ptr_stack_n_push(&EG(argument_stack), 2, (void *) (long) param_count, NULL);
if (function_state.function->type == ZEND_USER_FUNCTION) {
calling_symbol_table = EG(active_symbol_table);
if (symbol_table) {
EG(active_symbol_table) = symbol_table;
} else {
ALLOC_HASHTABLE(EG(active_symbol_table));
zend_hash_init(EG(active_symbol_table), 0, NULL, ZVAL_PTR_DTOR, 0);
}
if (object) {
zval *dummy, **this_ptr;
ALLOC_ZVAL(dummy);
INIT_ZVAL(*dummy);
zend_hash_update(EG(active_symbol_table), "this", sizeof("this"), &dummy, sizeof(zval *), (void **) &this_ptr);
zend_assign_to_variable_reference(NULL, this_ptr, &object, NULL ELS_CC);
}
original_return_value = EG(return_value_ptr_ptr);
original_op_array = EG(active_op_array);
EG(return_value_ptr_ptr) = retval_ptr_ptr;
EG(active_op_array) = (zend_op_array *) function_state.function;
original_opline_ptr = EG(opline_ptr);
zend_execute(EG(active_op_array) ELS_CC);
if (!symbol_table) {
zend_hash_destroy(EG(active_symbol_table));
FREE_HASHTABLE(EG(active_symbol_table));
}
EG(active_symbol_table) = calling_symbol_table;
EG(active_op_array) = original_op_array;
EG(return_value_ptr_ptr)=original_return_value;
EG(opline_ptr) = original_opline_ptr;
} else {
ALLOC_INIT_ZVAL(*retval_ptr_ptr);
((zend_internal_function *) function_state.function)->handler(param_count, *retval_ptr_ptr, object, 1 ELS_CC);
INIT_PZVAL(*retval_ptr_ptr);
}
zend_ptr_stack_clear_multiple(ELS_C);
EG(function_state_ptr) = original_function_state_ptr;
return SUCCESS;
}
ZEND_API int zend_eval_string(char *str, zval *retval_ptr, char *string_name CLS_DC ELS_DC)
{
zval pv;
zend_op_array *new_op_array;
zend_op_array *original_active_op_array = EG(active_op_array);
zend_function_state *original_function_state_ptr = EG(function_state_ptr);
int original_handle_op_arrays;
int retval;
if (retval_ptr) {
pv.value.str.len = strlen(str)+sizeof("return ;")-1;
pv.value.str.val = emalloc(pv.value.str.len+1);
strcpy(pv.value.str.val, "return ");
strcat(pv.value.str.val, str);
strcat(pv.value.str.val, " ;");
} else {
pv.value.str.len = strlen(str);
pv.value.str.val = estrndup(str, pv.value.str.len);
}
pv.type = IS_STRING;
/*printf("Evaluating '%s'\n", pv.value.str.val);*/
original_handle_op_arrays = CG(handle_op_arrays);
CG(handle_op_arrays) = 0;
new_op_array = compile_string(&pv, string_name CLS_CC);
CG(handle_op_arrays) = original_handle_op_arrays;
if (new_op_array) {
zval *local_retval_ptr=NULL;
zval **original_return_value_ptr_ptr = EG(return_value_ptr_ptr);
zend_op **original_opline_ptr = EG(opline_ptr);
EG(return_value_ptr_ptr) = &local_retval_ptr;
EG(active_op_array) = new_op_array;
EG(no_extensions)=1;
zend_execute(new_op_array ELS_CC);
if (local_retval_ptr) {
if (retval_ptr) {
COPY_PZVAL_TO_ZVAL(*retval_ptr, local_retval_ptr);
} else {
zval_ptr_dtor(&local_retval_ptr);
}
} else {
if (retval_ptr) {
INIT_ZVAL(*retval_ptr);
}
}
EG(no_extensions)=0;
EG(opline_ptr) = original_opline_ptr;
EG(active_op_array) = original_active_op_array;
EG(function_state_ptr) = original_function_state_ptr;
destroy_op_array(new_op_array);
efree(new_op_array);
EG(return_value_ptr_ptr) = original_return_value_ptr_ptr;
retval = SUCCESS;
} else {
retval = FAILURE;
}
zval_dtor(&pv);
return retval;
}
#if SUPPORT_INTERACTIVE
void execute_new_code(CLS_D)
{
ELS_FETCH();
if (!EG(interactive)
|| CG(active_op_array)->backpatch_count>0
|| CG(active_op_array)->function_name
|| CG(active_op_array)->type!=ZEND_USER_FUNCTION) {
return;
}
CG(active_op_array)->start_op_number = CG(active_op_array)->last_executed_op_number;
CG(active_op_array)->end_op_number = CG(active_op_array)->last;
EG(active_op_array) = CG(active_op_array);
zend_execute(CG(active_op_array) ELS_CC);
zval_ptr_dtor(EG(return_value_ptr_ptr));
CG(active_op_array)->start_op_number = CG(active_op_array)->last_executed_op_number;
}
#endif
ZEND_API void zend_timeout(int dummy)
{
ELS_FETCH();
/* is there any point in this? we're terminating the request anyway...
PLS_FETCH();
PG(connection_status) |= PHP_CONNECTION_TIMEOUT;
*/
zend_error(E_ERROR, "Maximum execution time of %d second%s exceeded",
EG(timeout_seconds), EG(timeout_seconds) == 1 ? "" : "s");
}
#ifdef ZEND_WIN32
static LRESULT CALLBACK zend_timeout_WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
switch (message) {
case WM_DESTROY:
PostQuitMessage(0);
break;
case WM_REGISTER_ZEND_TIMEOUT:
/* wParam is the thread id pointer, lParam is the timeout amount in seconds */
if (lParam==0) {
KillTimer(timeout_window, wParam);
} else {
SetTimer(timeout_window, wParam, lParam*1000, NULL);
}
break;
case WM_UNREGISTER_ZEND_TIMEOUT:
/* wParam is the thread id pointer */
KillTimer(timeout_window, wParam);
break;
case WM_TIMER: {
#ifdef ZTS
zend_executor_globals *executor_globals;
executor_globals = ts_resource_ex(executor_globals_id, &wParam);
if (!executor_globals) {
/* Thread died before receiving its timeout? */
break;
}
#endif
KillTimer(timeout_window, wParam);
EG(timed_out) = 1;
}
break;
default:
return DefWindowProc(hWnd,message,wParam,lParam);
}
return 0;
}
static unsigned __stdcall timeout_thread_proc(void *pArgs)
{
MSG message;
wc.style=0;
wc.lpfnWndProc = zend_timeout_WndProc;
wc.cbClsExtra=0;
wc.cbWndExtra=0;
wc.hInstance=NULL;
wc.hIcon=NULL;
wc.hCursor=NULL;
wc.hbrBackground=(HBRUSH)(COLOR_BACKGROUND + 5);
wc.lpszMenuName=NULL;
wc.lpszClassName = "Zend Timeout Window";
if(!RegisterClass(&wc)) {
return -1;
}
timeout_window = CreateWindow(wc.lpszClassName, wc.lpszClassName, 0, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, NULL, NULL, NULL, NULL);
SetEvent(timeout_thread_event);
while (GetMessage(&message, NULL, 0, 0)) {
SendMessage(timeout_window, message.message, message.wParam, message.lParam);
if (message.message == WM_QUIT) {
break;
}
}
DestroyWindow(timeout_window);
UnregisterClass(wc.lpszClassName, NULL);
return 0;
}
void zend_init_timeout_thread()
{
timeout_thread_event = CreateEvent(NULL, FALSE, FALSE, NULL);
_beginthreadex(NULL, 0, timeout_thread_proc, NULL, 0, &timeout_thread_id);
WaitForSingleObject(timeout_thread_event, INFINITE);
}
void zend_shutdown_timeout_thread()
{
if (!timeout_thread_initialized) {
return;
}
PostThreadMessage(timeout_thread_id, WM_QUIT, 0, 0);
}
#endif
/* This one doesn't exists on QNX */
#ifndef SIGPROF
#define SIGPROF 27
#endif
void zend_set_timeout(long seconds)
{
ELS_FETCH();
EG(timeout_seconds) = seconds;
#ifdef ZEND_WIN32
if (timeout_thread_initialized==0 && InterlockedIncrement(&timeout_thread_initialized)==1) {
/* We start up this process-wide thread here and not in zend_startup(), because if Zend
* is initialized inside a DllMain(), you're not supposed to start threads from it.
*/
zend_init_timeout_thread();
}
PostThreadMessage(timeout_thread_id, WM_REGISTER_ZEND_TIMEOUT, (WPARAM) GetCurrentThreadId(), (LPARAM) seconds);
#else
# ifdef HAVE_SETITIMER
{
struct itimerval t_r; /* timeout requested */
sigset_t sigset;
t_r.it_value.tv_sec = seconds;
t_r.it_value.tv_usec = t_r.it_interval.tv_sec = t_r.it_interval.tv_usec = 0;
setitimer(ITIMER_PROF, &t_r, NULL);
signal(SIGPROF, zend_timeout);
sigemptyset(&sigset);
sigaddset(&sigset, SIGPROF);
sigprocmask(SIG_UNBLOCK,&sigset,NULL);
}
# endif
#endif
}
void zend_unset_timeout(void)
{
ELS_FETCH();
#ifdef ZEND_WIN32
PostThreadMessage(timeout_thread_id, WM_UNREGISTER_ZEND_TIMEOUT, (WPARAM) GetCurrentThreadId(), (LPARAM) 0);
#else
# ifdef HAVE_SETITIMER
{
struct itimerval no_timeout;
no_timeout.it_value.tv_sec = no_timeout.it_value.tv_usec = no_timeout.it_interval.tv_sec = no_timeout.it_interval.tv_usec = 0;
setitimer(ITIMER_PROF, &no_timeout, NULL);
}
# endif
#endif
}