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php-src/Zend/zend_opcode.c

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/*
+----------------------------------------------------------------------+
| Zend Engine |
+----------------------------------------------------------------------+
| Copyright (c) 1998-2007 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> |
+----------------------------------------------------------------------+
*/
/* $Id$ */
#include <stdio.h>
#include "zend.h"
#include "zend_alloc.h"
#include "zend_compile.h"
#include "zend_extensions.h"
#include "zend_API.h"
#include "zend_vm.h"
static void zend_extension_op_array_ctor_handler(zend_extension *extension, zend_op_array *op_array TSRMLS_DC)
{
if (extension->op_array_ctor) {
extension->op_array_ctor(op_array);
}
}
static void zend_extension_op_array_dtor_handler(zend_extension *extension, zend_op_array *op_array TSRMLS_DC)
{
if (extension->op_array_dtor) {
extension->op_array_dtor(op_array);
}
}
static void op_array_alloc_ops(zend_op_array *op_array)
{
op_array->opcodes = erealloc(op_array->opcodes, (op_array->size)*sizeof(zend_op));
}
void init_op_array(zend_op_array *op_array, zend_uchar type, int initial_ops_size TSRMLS_DC)
{
op_array->type = type;
op_array->backpatch_count = 0;
if (CG(interactive)) {
/* We must avoid a realloc() on the op_array in interactive mode, since pointers to constants
* will become invalid
*/
initial_ops_size = 8192;
}
op_array->refcount = (zend_uint *) emalloc(sizeof(zend_uint));
*op_array->refcount = 1;
op_array->size = initial_ops_size;
op_array->last = 0;
op_array->opcodes = NULL;
op_array_alloc_ops(op_array);
op_array->size_var = 0; /* FIXME:??? */
op_array->last_var = 0;
op_array->vars = NULL;
op_array->T = 0;
op_array->function_name = NULL;
op_array->filename = zend_get_compiled_filename(TSRMLS_C);
op_array->doc_comment = NULL;
op_array->doc_comment_len = 0;
op_array->arg_info = NULL;
op_array->num_args = 0;
op_array->required_num_args = 0;
op_array->scope = NULL;
op_array->brk_cont_array = NULL;
op_array->try_catch_array = NULL;
op_array->last_brk_cont = 0;
op_array->current_brk_cont = -1;
op_array->static_variables = NULL;
op_array->last_try_catch = 0;
op_array->return_reference = 0;
op_array->done_pass_two = 0;
op_array->uses_this = 0;
op_array->start_op = NULL;
op_array->fn_flags = CG(interactive)?ZEND_ACC_INTERACTIVE:0;
memset(op_array->reserved, 0, ZEND_MAX_RESERVED_RESOURCES * sizeof(void*));
zend_llist_apply_with_argument(&zend_extensions, (llist_apply_with_arg_func_t) zend_extension_op_array_ctor_handler, op_array TSRMLS_CC);
}
ZEND_API void destroy_zend_function(zend_function *function TSRMLS_DC)
{
switch (function->type) {
case ZEND_USER_FUNCTION:
destroy_op_array((zend_op_array *) function TSRMLS_CC);
break;
case ZEND_INTERNAL_FUNCTION:
/* do nothing */
break;
}
}
ZEND_API void zend_function_dtor(zend_function *function)
{
TSRMLS_FETCH();
destroy_zend_function(function TSRMLS_CC);
}
static void zend_cleanup_op_array_data(zend_op_array *op_array)
{
if (op_array->static_variables) {
zend_hash_clean(op_array->static_variables);
}
}
ZEND_API int zend_cleanup_function_data(zend_function *function TSRMLS_DC)
{
if (function->type == ZEND_USER_FUNCTION) {
zend_cleanup_op_array_data((zend_op_array *) function);
return ZEND_HASH_APPLY_KEEP;
} else {
return ZEND_HASH_APPLY_STOP;
}
}
ZEND_API int zend_cleanup_function_data_full(zend_function *function TSRMLS_DC)
{
if (function->type == ZEND_USER_FUNCTION) {
zend_cleanup_op_array_data((zend_op_array *) function);
}
return 0;
}
ZEND_API int zend_cleanup_class_data(zend_class_entry **pce TSRMLS_DC)
{
if ((*pce)->type == ZEND_USER_CLASS) {
/* Clean all parts that can contain run-time data */
/* Note that only run-time accessed data need to be cleaned up, pre-defined data can
not contain objects and thus are not probelmatic */
zend_hash_apply(&(*pce)->function_table, (apply_func_t) zend_cleanup_function_data_full TSRMLS_CC);
(*pce)->static_members = NULL;
} else if (CE_STATIC_MEMBERS(*pce)) {
zend_hash_destroy(CE_STATIC_MEMBERS(*pce));
FREE_HASHTABLE(CE_STATIC_MEMBERS(*pce));
#ifdef ZTS
CG(static_members)[(zend_intptr_t)((*pce)->static_members)] = NULL;
#else
(*pce)->static_members = NULL;
#endif
}
return 0;
}
ZEND_API void destroy_zend_class(zend_class_entry **pce)
{
zend_class_entry *ce = *pce;
if (--ce->refcount > 0) {
return;
}
switch (ce->type) {
case ZEND_USER_CLASS:
zend_hash_destroy(&ce->default_properties);
zend_hash_destroy(&ce->properties_info);
zend_hash_destroy(&ce->default_static_members);
efree(ce->name);
zend_hash_destroy(&ce->function_table);
zend_hash_destroy(&ce->constants_table);
if (ce->num_interfaces > 0 && ce->interfaces) {
efree(ce->interfaces);
}
if (ce->doc_comment) {
efree(ce->doc_comment);
}
efree(ce);
break;
case ZEND_INTERNAL_CLASS:
zend_hash_destroy(&ce->default_properties);
zend_hash_destroy(&ce->properties_info);
zend_hash_destroy(&ce->default_static_members);
free(ce->name);
zend_hash_destroy(&ce->function_table);
zend_hash_destroy(&ce->constants_table);
if (ce->num_interfaces > 0) {
free(ce->interfaces);
}
if (ce->doc_comment) {
free(ce->doc_comment);
}
free(ce);
break;
}
}
void zend_class_add_ref(zend_class_entry **ce)
{
(*ce)->refcount++;
}
ZEND_API void destroy_op_array(zend_op_array *op_array TSRMLS_DC)
{
zend_op *opline = op_array->opcodes;
zend_op *end = op_array->opcodes+op_array->last;
zend_uint i;
if (op_array->static_variables) {
zend_hash_destroy(op_array->static_variables);
FREE_HASHTABLE(op_array->static_variables);
}
if (--(*op_array->refcount)>0) {
return;
}
efree(op_array->refcount);
if (op_array->vars) {
i = op_array->last_var;
while (i > 0) {
i--;
efree(op_array->vars[i].name);
}
efree(op_array->vars);
}
while (opline<end) {
if (opline->op1.op_type==IS_CONST) {
#if DEBUG_ZEND>2
printf("Reducing refcount for %x 1=>0 (destroying)\n", &opline->op1.u.constant);
#endif
zval_dtor(&opline->op1.u.constant);
}
if (opline->op2.op_type==IS_CONST) {
#if DEBUG_ZEND>2
printf("Reducing refcount for %x 1=>0 (destroying)\n", &opline->op2.u.constant);
#endif
zval_dtor(&opline->op2.u.constant);
}
opline++;
}
efree(op_array->opcodes);
if (op_array->function_name) {
efree(op_array->function_name);
}
if (op_array->doc_comment) {
efree(op_array->doc_comment);
}
if (op_array->brk_cont_array) {
efree(op_array->brk_cont_array);
}
if (op_array->try_catch_array) {
efree(op_array->try_catch_array);
}
if (op_array->done_pass_two) {
zend_llist_apply_with_argument(&zend_extensions, (llist_apply_with_arg_func_t) zend_extension_op_array_dtor_handler, op_array TSRMLS_CC);
}
if (op_array->arg_info) {
for (i=0; i<op_array->num_args; i++) {
efree((char*)op_array->arg_info[i].name);
if (op_array->arg_info[i].class_name) {
efree((char*)op_array->arg_info[i].class_name);
}
}
efree(op_array->arg_info);
}
}
void init_op(zend_op *op TSRMLS_DC)
{
memset(op, 0, sizeof(zend_op));
op->lineno = CG(zend_lineno);
SET_UNUSED(op->result);
}
zend_op *get_next_op(zend_op_array *op_array TSRMLS_DC)
{
zend_uint next_op_num = op_array->last++;
zend_op *next_op;
if (next_op_num >= op_array->size) {
if (op_array->fn_flags & ZEND_ACC_INTERACTIVE) {
/* we messed up */
zend_printf("Ran out of opcode space!\n"
"You should probably consider writing this huge script into a file!\n");
zend_bailout();
}
op_array->size *= 4;
op_array_alloc_ops(op_array);
}
next_op = &(op_array->opcodes[next_op_num]);
init_op(next_op TSRMLS_CC);
return next_op;
}
int get_next_op_number(zend_op_array *op_array)
{
return op_array->last;
}
zend_brk_cont_element *get_next_brk_cont_element(zend_op_array *op_array)
{
op_array->last_brk_cont++;
op_array->brk_cont_array = erealloc(op_array->brk_cont_array, sizeof(zend_brk_cont_element)*op_array->last_brk_cont);
return &op_array->brk_cont_array[op_array->last_brk_cont-1];
}
static void zend_update_extended_info(zend_op_array *op_array TSRMLS_DC)
{
zend_op *opline = op_array->opcodes, *end=opline+op_array->last;
while (opline<end) {
if (opline->opcode == ZEND_EXT_STMT) {
if (opline+1<end) {
if ((opline+1)->opcode == ZEND_EXT_STMT) {
opline->opcode = ZEND_NOP;
opline++;
continue;
}
if (opline+1<end) {
opline->lineno = (opline+1)->lineno;
}
} else {
opline->opcode = ZEND_NOP;
}
}
opline++;
}
}
static void zend_extension_op_array_handler(zend_extension *extension, zend_op_array *op_array TSRMLS_DC)
{
if (extension->op_array_handler) {
extension->op_array_handler(op_array);
}
}
int pass_two(zend_op_array *op_array TSRMLS_DC)
{
zend_op *opline, *end;
if (op_array->type!=ZEND_USER_FUNCTION && op_array->type!=ZEND_EVAL_CODE) {
return 0;
}
if (CG(extended_info)) {
zend_update_extended_info(op_array TSRMLS_CC);
}
if (CG(handle_op_arrays)) {
zend_llist_apply_with_argument(&zend_extensions, (llist_apply_with_arg_func_t) zend_extension_op_array_handler, op_array TSRMLS_CC);
}
if (!(op_array->fn_flags & ZEND_ACC_INTERACTIVE) && op_array->size != op_array->last) {
op_array->opcodes = (zend_op *) erealloc(op_array->opcodes, sizeof(zend_op)*op_array->last);
op_array->size = op_array->last;
}
opline = op_array->opcodes;
end = opline + op_array->last;
while (opline < end) {
if (opline->op1.op_type == IS_CONST) {
Z_SET_ISREF(opline->op1.u.constant);
Z_SET_REFCOUNT(opline->op1.u.constant, 2); /* Make sure is_ref won't be reset */
}
if (opline->op2.op_type == IS_CONST) {
Z_SET_ISREF(opline->op2.u.constant);
Z_SET_REFCOUNT(opline->op2.u.constant, 2);
}
switch (opline->opcode) {
case ZEND_JMP:
opline->op1.u.jmp_addr = &op_array->opcodes[opline->op1.u.opline_num];
break;
case ZEND_JMPZ:
case ZEND_JMPNZ:
case ZEND_JMPZ_EX:
case ZEND_JMPNZ_EX:
opline->op2.u.jmp_addr = &op_array->opcodes[opline->op2.u.opline_num];
break;
}
ZEND_VM_SET_OPCODE_HANDLER(opline);
opline++;
}
op_array->done_pass_two = 1;
return 0;
}
int print_class(zend_class_entry *class_entry TSRMLS_DC)
{
printf("Class %s:\n", class_entry->name);
zend_hash_apply(&class_entry->function_table, (apply_func_t) pass_two TSRMLS_CC);
printf("End of class %s.\n\n", class_entry->name);
return 0;
}
ZEND_API unary_op_type get_unary_op(int opcode)
{
switch (opcode) {
case ZEND_BW_NOT:
return (unary_op_type) bitwise_not_function;
break;
case ZEND_BOOL_NOT:
return (unary_op_type) boolean_not_function;
break;
default:
return (unary_op_type) NULL;
break;
}
}
ZEND_API void *get_binary_op(int opcode)
{
switch (opcode) {
case ZEND_ADD:
case ZEND_ASSIGN_ADD:
return (void *) add_function;
break;
case ZEND_SUB:
case ZEND_ASSIGN_SUB:
return (void *) sub_function;
break;
case ZEND_MUL:
case ZEND_ASSIGN_MUL:
return (void *) mul_function;
break;
case ZEND_DIV:
case ZEND_ASSIGN_DIV:
return (void *) div_function;
break;
case ZEND_MOD:
case ZEND_ASSIGN_MOD:
return (void *) mod_function;
break;
case ZEND_SL:
case ZEND_ASSIGN_SL:
return (void *) shift_left_function;
break;
case ZEND_SR:
case ZEND_ASSIGN_SR:
return (void *) shift_right_function;
break;
case ZEND_CONCAT:
case ZEND_ASSIGN_CONCAT:
return (void *) concat_function;
break;
case ZEND_IS_IDENTICAL:
return (void *) is_identical_function;
break;
case ZEND_IS_NOT_IDENTICAL:
return (void *) is_not_identical_function;
break;
case ZEND_IS_EQUAL:
return (void *) is_equal_function;
break;
case ZEND_IS_NOT_EQUAL:
return (void *) is_not_equal_function;
break;
case ZEND_IS_SMALLER:
return (void *) is_smaller_function;
break;
case ZEND_IS_SMALLER_OR_EQUAL:
return (void *) is_smaller_or_equal_function;
break;
case ZEND_BW_OR:
case ZEND_ASSIGN_BW_OR:
return (void *) bitwise_or_function;
break;
case ZEND_BW_AND:
case ZEND_ASSIGN_BW_AND:
return (void *) bitwise_and_function;
break;
case ZEND_BW_XOR:
case ZEND_ASSIGN_BW_XOR:
return (void *) bitwise_xor_function;
break;
default:
return (void *) NULL;
break;
}
}
/*
* Local variables:
* tab-width: 4
* c-basic-offset: 4
* indent-tabs-mode: t
* End:
*/
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