php-src/Zend/zend_execute_API.c
2000-04-26 22:10:06 +00:00

606 lines
16 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"
ZEND_API void (*zend_execute)(zend_op_array *op_array ELS_DC);
#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();
}
}
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) = &EG(global_return_value);
INIT_ZVAL(EG(global_return_value));
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));
EG(main_op_array) = NULL;
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;
}
void shutdown_executor(ELS_D)
{
if (EG(global_return_value_ptr) == &EG(global_return_value)) {
zval_dtor(&EG(global_return_value));
} else {
zval_ptr_dtor(EG(return_value_ptr_ptr));
}
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_destroy_rsrc_list(ELS_C); /* must be destroyed after the main symbol table is destroyed */
zend_ptr_stack_destroy(&EG(argument_stack));
if (EG(main_op_array)) {
destroy_op_array(EG(main_op_array));
efree(EG(main_op_array));
}
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_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(opline_ptr)) {
return active_opline->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 inline void safe_free_zval_ptr(zval *p)
{
ELS_FETCH();
if (p!=EG(uninitialized_zval_ptr)) {
FREE_ZVAL(p);
}
}
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 inline int i_zend_is_true(zval *op)
{
int result;
switch (op->type) {
case IS_NULL:
result = 0;
break;
case IS_LONG:
case IS_BOOL:
case IS_RESOURCE:
result = (op->value.lval?1:0);
break;
case IS_DOUBLE:
result = (op->value.dval ? 1 : 0);
break;
case IS_STRING:
if (op->value.str.len == 0
|| (op->value.str.len==1 && op->value.str.val[0]=='0')) {
result = 0;
} else {
result = 1;
}
break;
case IS_ARRAY:
result = (zend_hash_num_elements(op->value.ht)?1:0);
break;
case IS_OBJECT:
result = (zend_hash_num_elements(op->value.obj.properties)?1:0);
break;
default:
result = 0;
break;
}
return result;
}
ZEND_API int zend_is_true(zval *op)
{
return i_zend_is_true(op);
}
ZEND_API int zval_update_constant(zval **pp)
{
zval *p = *pp;
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;
} else {
STR_FREE(p->value.str.val);
*p = c;
}
INIT_PZVAL(p);
p->refcount = refcount;
} else if (p->type == IS_ARRAY) {
SEPARATE_ZVAL(pp);
p = *pp;
zend_hash_apply(p->value.ht, (int (*)(void *)) zval_update_constant);
}
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);
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)
{
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 (object) {
if (object->type != IS_OBJECT) {
return FAILURE;
}
function_table = &object->value.obj.ce->function_table;
}
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);
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);
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 void zend_eval_string(char *str, zval *retval_ptr 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;
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 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;
} else {
printf("Failed executing:\n%s\n", str);
}
zval_dtor(&pv);
}
ZEND_API inline void zend_assign_to_variable_reference(znode *result, zval **variable_ptr_ptr, zval **value_ptr_ptr, temp_variable *Ts ELS_DC)
{
zval *variable_ptr = *variable_ptr_ptr;
zval *value_ptr;
if (!value_ptr_ptr) {
zend_error(E_ERROR, "Cannot create references to string offsets nor overloaded objects");
return;
}
value_ptr = *value_ptr_ptr;
if (variable_ptr == EG(error_zval_ptr) || value_ptr==EG(error_zval_ptr)) {
variable_ptr_ptr = &EG(uninitialized_zval_ptr);
/* } else if (variable_ptr==&EG(uninitialized_zval) || variable_ptr!=value_ptr) { */
} else if (variable_ptr_ptr != value_ptr_ptr) {
variable_ptr->refcount--;
if (variable_ptr->refcount==0) {
zendi_zval_dtor(*variable_ptr);
FREE_ZVAL(variable_ptr);
}
if (!PZVAL_IS_REF(value_ptr)) {
/* break it away */
value_ptr->refcount--;
if (value_ptr->refcount>0) {
ALLOC_ZVAL(*value_ptr_ptr);
**value_ptr_ptr = *value_ptr;
value_ptr = *value_ptr_ptr;
zendi_zval_copy_ctor(*value_ptr);
}
value_ptr->refcount = 1;
value_ptr->is_ref = 1;
}
*variable_ptr_ptr = value_ptr;
value_ptr->refcount++;
} else {
if (variable_ptr->refcount>1) { /* we need to break away */
SEPARATE_ZVAL(variable_ptr_ptr);
}
(*variable_ptr_ptr)->is_ref = 1;
}
if (result && (result->op_type != IS_UNUSED)) {
Ts[result->u.var].var.ptr_ptr = variable_ptr_ptr;
SELECTIVE_PZVAL_LOCK(*variable_ptr_ptr, result);
AI_USE_PTR(Ts[result->u.var].var);
}
}
#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);
CG(active_op_array)->start_op_number = CG(active_op_array)->last_executed_op_number;
}
#endif
/* these are a dedicated, optimized, function, and shouldn't be used for any purpose
* other than by Zend's executor
*/
ZEND_API inline void zend_ptr_stack_clear_multiple(ELS_D)
{
void **p = EG(argument_stack).top_element-2;
int delete_count = (ulong) *p;
EG(argument_stack).top -= (delete_count+2);
while (--delete_count>=0) {
zval_ptr_dtor((zval **) --p);
}
EG(argument_stack).top_element = p;
}
ZEND_API int zend_ptr_stack_get_arg(int requested_arg, void **data ELS_DC)
{
void **p = EG(argument_stack).top_element-2;
int arg_count = (ulong) *p;
if (requested_arg>arg_count) {
return FAILURE;
}
*data = (p-arg_count+requested_arg-1);
return SUCCESS;
}