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zend_opcode.c
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/*
+----------------------------------------------------------------------+
| Zend Engine |
+----------------------------------------------------------------------+
| Copyright (c) 1998-2015 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 |
| [email protected] so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
| Authors: Andi Gutmans <[email protected]> |
| Zeev Suraski <[email protected]> |
+----------------------------------------------------------------------+
*/
/* $Id$ */
#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)
{
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)
{
if (extension->op_array_dtor) {
extension->op_array_dtor(op_array);
}
}
static void op_array_alloc_ops(zend_op_array *op_array, uint32_t size)
{
op_array->opcodes = erealloc(op_array->opcodes, size * sizeof(zend_op));
}
void init_op_array(zend_op_array *op_array, zend_uchar type, int initial_ops_size)
{
op_array->type = type;
op_array->arg_flags[0] = 0;
op_array->arg_flags[1] = 0;
op_array->arg_flags[2] = 0;
op_array->refcount = (uint32_t *) emalloc(sizeof(uint32_t));
*op_array->refcount = 1;
op_array->last = 0;
op_array->opcodes = NULL;
op_array_alloc_ops(op_array, initial_ops_size);
op_array->last_var = 0;
op_array->vars = NULL;
op_array->T = 0;
op_array->T_liveliness = NULL;
op_array->function_name = NULL;
op_array->filename = zend_get_compiled_filename();
op_array->doc_comment = NULL;
op_array->arg_info = NULL;
op_array->num_args = 0;
op_array->required_num_args = 0;
op_array->scope = NULL;
op_array->prototype = NULL;
op_array->try_catch_array = NULL;
op_array->static_variables = NULL;
op_array->last_try_catch = 0;
op_array->this_var = -1;
op_array->fn_flags = 0;
op_array->early_binding = -1;
op_array->last_literal = 0;
op_array->literals = NULL;
op_array->run_time_cache = NULL;
op_array->cache_size = 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);
}
ZEND_API void destroy_zend_function(zend_function *function)
{
if (function->type == ZEND_USER_FUNCTION) {
destroy_op_array(&function->op_array);
} else {
ZEND_ASSERT(function->type == ZEND_INTERNAL_FUNCTION);
ZEND_ASSERT(function->common.function_name);
zend_string_release(function->common.function_name);
}
}
ZEND_API void zend_function_dtor(zval *zv)
{
zend_function *function = Z_PTR_P(zv);
if (function->type == ZEND_USER_FUNCTION) {
ZEND_ASSERT(function->common.function_name);
destroy_op_array(&function->op_array);
/* op_arrays are allocated on arena, so we don't have to free them */
} else {
ZEND_ASSERT(function->type == ZEND_INTERNAL_FUNCTION);
ZEND_ASSERT(function->common.function_name);
zend_string_release(function->common.function_name);
if (!(function->common.fn_flags & ZEND_ACC_ARENA_ALLOCATED)) {
pefree(function, 1);
}
}
}
ZEND_API void zend_cleanup_op_array_data(zend_op_array *op_array)
{
if (op_array->static_variables &&
!(GC_FLAGS(op_array->static_variables) & IS_ARRAY_IMMUTABLE)) {
zend_hash_clean(op_array->static_variables);
}
}
ZEND_API void zend_cleanup_user_class_data(zend_class_entry *ce)
{
/* 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 */
if (ce->ce_flags & ZEND_HAS_STATIC_IN_METHODS) {
zend_function *func;
ZEND_HASH_FOREACH_PTR(&ce->function_table, func) {
if (func->type == ZEND_USER_FUNCTION) {
zend_cleanup_op_array_data((zend_op_array *) func);
}
} ZEND_HASH_FOREACH_END();
}
if (ce->static_members_table) {
zval *static_members = ce->static_members_table;
zval *p = static_members;
zval *end = p + ce->default_static_members_count;
ce->default_static_members_count = 0;
ce->default_static_members_table = ce->static_members_table = NULL;
while (p != end) {
i_zval_ptr_dtor(p ZEND_FILE_LINE_CC);
p++;
}
efree(static_members);
}
}
ZEND_API void zend_cleanup_internal_class_data(zend_class_entry *ce)
{
if (CE_STATIC_MEMBERS(ce)) {
zval *static_members = CE_STATIC_MEMBERS(ce);
zval *p = static_members;
zval *end = p + ce->default_static_members_count;
#ifdef ZTS
CG(static_members_table)[(zend_intptr_t)(ce->static_members_table)] = NULL;
#else
ce->static_members_table = NULL;
#endif
ce->ce_flags &= ~ZEND_ACC_CONSTANTS_UPDATED;
while (p != end) {
i_zval_ptr_dtor(p ZEND_FILE_LINE_CC);
p++;
}
efree(static_members);
}
}
void _destroy_zend_class_traits_info(zend_class_entry *ce)
{
if (ce->num_traits > 0 && ce->traits) {
efree(ce->traits);
}
if (ce->trait_aliases) {
size_t i = 0;
while (ce->trait_aliases[i]) {
if (ce->trait_aliases[i]->trait_method) {
if (ce->trait_aliases[i]->trait_method->method_name) {
zend_string_release(ce->trait_aliases[i]->trait_method->method_name);
}
if (ce->trait_aliases[i]->trait_method->class_name) {
zend_string_release(ce->trait_aliases[i]->trait_method->class_name);
}
efree(ce->trait_aliases[i]->trait_method);
}
if (ce->trait_aliases[i]->alias) {
zend_string_release(ce->trait_aliases[i]->alias);
}
efree(ce->trait_aliases[i]);
i++;
}
efree(ce->trait_aliases);
}
if (ce->trait_precedences) {
size_t i = 0;
while (ce->trait_precedences[i]) {
zend_string_release(ce->trait_precedences[i]->trait_method->method_name);
zend_string_release(ce->trait_precedences[i]->trait_method->class_name);
efree(ce->trait_precedences[i]->trait_method);
if (ce->trait_precedences[i]->exclude_from_classes) {
size_t j = 0;
zend_trait_precedence *cur_precedence = ce->trait_precedences[i];
while (cur_precedence->exclude_from_classes[j].class_name) {
zend_string_release(cur_precedence->exclude_from_classes[j].class_name);
j++;
}
efree(ce->trait_precedences[i]->exclude_from_classes);
}
efree(ce->trait_precedences[i]);
i++;
}
efree(ce->trait_precedences);
}
}
ZEND_API void destroy_zend_class(zval *zv)
{
zend_property_info *prop_info;
zend_class_entry *ce = Z_PTR_P(zv);
if (--ce->refcount > 0) {
return;
}
switch (ce->type) {
case ZEND_USER_CLASS:
if (ce->default_properties_table) {
zval *p = ce->default_properties_table;
zval *end = p + ce->default_properties_count;
while (p != end) {
i_zval_ptr_dtor(p ZEND_FILE_LINE_CC);
p++;
}
efree(ce->default_properties_table);
}
if (ce->default_static_members_table) {
zval *p = ce->default_static_members_table;
zval *end = p + ce->default_static_members_count;
while (p != end) {
i_zval_ptr_dtor(p ZEND_FILE_LINE_CC);
p++;
}
efree(ce->default_static_members_table);
}
ZEND_HASH_FOREACH_PTR(&ce->properties_info, prop_info) {
if (prop_info->ce == ce || (prop_info->flags & ZEND_ACC_SHADOW)) {
zend_string_release(prop_info->name);
if (prop_info->doc_comment) {
zend_string_release(prop_info->doc_comment);
}
}
} ZEND_HASH_FOREACH_END();
zend_hash_destroy(&ce->properties_info);
zend_string_release(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->info.user.doc_comment) {
zend_string_release(ce->info.user.doc_comment);
}
_destroy_zend_class_traits_info(ce);
break;
case ZEND_INTERNAL_CLASS:
if (ce->default_properties_table) {
zval *p = ce->default_properties_table;
zval *end = p + ce->default_properties_count;
while (p != end) {
zval_internal_ptr_dtor(p);
p++;
}
free(ce->default_properties_table);
}
if (ce->default_static_members_table) {
zval *p = ce->default_static_members_table;
zval *end = p + ce->default_static_members_count;
while (p != end) {
zval_internal_ptr_dtor(p);
p++;
}
free(ce->default_static_members_table);
}
zend_hash_destroy(&ce->properties_info);
zend_string_release(ce->name);
zend_hash_destroy(&ce->function_table);
zend_hash_destroy(&ce->constants_table);
if (ce->num_interfaces > 0) {
free(ce->interfaces);
}
free(ce);
break;
}
}
void zend_class_add_ref(zval *zv)
{
zend_class_entry *ce = Z_PTR_P(zv);
ce->refcount++;
}
ZEND_API void destroy_op_array(zend_op_array *op_array)
{
zval *literal = op_array->literals;
zval *end;
uint32_t i;
if (op_array->static_variables &&
!(GC_FLAGS(op_array->static_variables) & IS_ARRAY_IMMUTABLE)) {
if (--GC_REFCOUNT(op_array->static_variables) == 0) {
zend_array_destroy(op_array->static_variables);
}
}
if (op_array->run_time_cache && !op_array->function_name) {
efree(op_array->run_time_cache);
}
if (!op_array->refcount || --(*op_array->refcount)>0) {
return;
}
efree_size(op_array->refcount, sizeof(*(op_array->refcount)));
if (op_array->vars) {
i = op_array->last_var;
while (i > 0) {
i--;
zend_string_release(op_array->vars[i]);
}
efree(op_array->vars);
}
if (literal) {
end = literal + op_array->last_literal;
while (literal < end) {
zval_ptr_dtor_nogc(literal);
literal++;
}
efree(op_array->literals);
}
efree(op_array->opcodes);
if (op_array->function_name) {
zend_string_release(op_array->function_name);
}
if (op_array->doc_comment) {
zend_string_release(op_array->doc_comment);
}
if (op_array->try_catch_array) {
efree(op_array->try_catch_array);
}
if (op_array->T_liveliness) {
efree(op_array->T_liveliness);
}
if (op_array->fn_flags & ZEND_ACC_DONE_PASS_TWO) {
zend_llist_apply_with_argument(&zend_extensions, (llist_apply_with_arg_func_t) zend_extension_op_array_dtor_handler, op_array);
}
if (op_array->arg_info) {
int32_t num_args = op_array->num_args;
zend_arg_info *arg_info = op_array->arg_info;
int32_t i;
if (op_array->fn_flags & ZEND_ACC_HAS_RETURN_TYPE) {
arg_info--;
num_args++;
}
if (op_array->fn_flags & ZEND_ACC_VARIADIC) {
num_args++;
}
for (i = 0 ; i < num_args; i++) {
if (arg_info[i].name) {
zend_string_release(arg_info[i].name);
}
if (arg_info[i].class_name) {
zend_string_release(arg_info[i].class_name);
}
}
efree(arg_info);
}
}
void init_op(zend_op *op)
{
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)
{
uint32_t next_op_num = op_array->last++;
zend_op *next_op;
if (next_op_num >= CG(context).opcodes_size) {
CG(context).opcodes_size *= 4;
op_array_alloc_ops(op_array, CG(context).opcodes_size);
}
next_op = &(op_array->opcodes[next_op_num]);
init_op(next_op);
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)
{
CG(context).last_brk_cont++;
CG(context).brk_cont_array = erealloc(CG(context).brk_cont_array, sizeof(zend_brk_cont_element)*CG(context).last_brk_cont);
return &CG(context).brk_cont_array[CG(context).last_brk_cont-1];
}
static void zend_update_extended_info(zend_op_array *op_array)
{
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)
{
if (extension->op_array_handler) {
extension->op_array_handler(op_array);
}
}
static void zend_check_finally_breakout(zend_op_array *op_array, uint32_t op_num, uint32_t dst_num)
{
int i;
for (i = 0; i < op_array->last_try_catch; i++) {
if ((op_num < op_array->try_catch_array[i].finally_op ||
op_num >= op_array->try_catch_array[i].finally_end)
&& (dst_num >= op_array->try_catch_array[i].finally_op &&
dst_num <= op_array->try_catch_array[i].finally_end)) {
CG(in_compilation) = 1;
CG(active_op_array) = op_array;
CG(zend_lineno) = op_array->opcodes[op_num].lineno;
zend_error_noreturn(E_COMPILE_ERROR, "jump into a finally block is disallowed");
} else if ((op_num >= op_array->try_catch_array[i].finally_op
&& op_num <= op_array->try_catch_array[i].finally_end)
&& (dst_num > op_array->try_catch_array[i].finally_end
|| dst_num < op_array->try_catch_array[i].finally_op)) {
CG(in_compilation) = 1;
CG(active_op_array) = op_array;
CG(zend_lineno) = op_array->opcodes[op_num].lineno;
zend_error_noreturn(E_COMPILE_ERROR, "jump out of a finally block is disallowed");
}
}
}
static void zend_adjust_fast_call(zend_op_array *op_array, uint32_t fast_call, uint32_t start, uint32_t end)
{
int i;
uint32_t op_num = 0;
for (i = 0; i < op_array->last_try_catch; i++) {
if (op_array->try_catch_array[i].finally_op > start
&& op_array->try_catch_array[i].finally_end < end) {
op_num = op_array->try_catch_array[i].finally_op;
start = op_array->try_catch_array[i].finally_end;
}
}
if (op_num) {
/* Must be ZEND_FAST_CALL */
ZEND_ASSERT(op_array->opcodes[op_num - 2].opcode == ZEND_FAST_CALL);
op_array->opcodes[op_num - 2].extended_value = ZEND_FAST_CALL_FROM_FINALLY;
op_array->opcodes[op_num - 2].op2.opline_num = fast_call;
}
}
static void zend_resolve_fast_call(zend_op_array *op_array, uint32_t fast_call, uint32_t op_num)
{
int i;
uint32_t finally_op_num = 0;
for (i = 0; i < op_array->last_try_catch; i++) {
if (op_num >= op_array->try_catch_array[i].finally_op
&& op_num < op_array->try_catch_array[i].finally_end) {
finally_op_num = op_array->try_catch_array[i].finally_op;
}
}
if (finally_op_num) {
/* Must be ZEND_FAST_CALL */
ZEND_ASSERT(op_array->opcodes[finally_op_num - 2].opcode == ZEND_FAST_CALL);
if (op_array->opcodes[fast_call].extended_value == 0) {
op_array->opcodes[fast_call].extended_value = ZEND_FAST_CALL_FROM_FINALLY;
op_array->opcodes[fast_call].op2.opline_num = finally_op_num - 2;
}
}
}
static void zend_resolve_finally_call(zend_op_array *op_array, uint32_t op_num, uint32_t dst_num)
{
uint32_t start_op;
zend_op *opline;
uint32_t i = op_array->last_try_catch;
if (dst_num != (uint32_t)-1) {
zend_check_finally_breakout(op_array, op_num, dst_num);
}
/* the backward order is mater */
while (i > 0) {
i--;
if (op_array->try_catch_array[i].finally_op &&
op_num >= op_array->try_catch_array[i].try_op &&
op_num < op_array->try_catch_array[i].finally_op - 1 &&
(dst_num < op_array->try_catch_array[i].try_op ||
dst_num > op_array->try_catch_array[i].finally_end)) {
/* we have a jump out of try block that needs executing finally */
uint32_t fast_call_var;
/* Must be ZEND_FAST_RET */
ZEND_ASSERT(op_array->opcodes[op_array->try_catch_array[i].finally_end].opcode == ZEND_FAST_RET);
fast_call_var = op_array->opcodes[op_array->try_catch_array[i].finally_end].op1.var;
/* generate a FAST_CALL to finally block */
start_op = get_next_op_number(op_array);
opline = get_next_op(op_array);
opline->opcode = ZEND_FAST_CALL;
opline->result_type = IS_TMP_VAR;
opline->result.var = fast_call_var;
SET_UNUSED(opline->op1);
SET_UNUSED(opline->op2);
zend_adjust_fast_call(op_array, start_op,
op_array->try_catch_array[i].finally_op,
op_array->try_catch_array[i].finally_end);
if (op_array->try_catch_array[i].catch_op) {
opline->extended_value = ZEND_FAST_CALL_FROM_CATCH;
opline->op2.opline_num = op_array->try_catch_array[i].catch_op;
opline->op1.opline_num = get_next_op_number(op_array);
/* generate a FAST_CALL to hole CALL_FROM_FINALLY */
opline = get_next_op(op_array);
opline->opcode = ZEND_FAST_CALL;
opline->result_type = IS_TMP_VAR;
opline->result.var = fast_call_var;
SET_UNUSED(opline->op1);
SET_UNUSED(opline->op2);
zend_resolve_fast_call(op_array, start_op + 1, op_array->try_catch_array[i].finally_op - 2);
} else {
zend_resolve_fast_call(op_array, start_op, op_array->try_catch_array[i].finally_op - 2);
}
opline->op1.opline_num = op_array->try_catch_array[i].finally_op;
/* generate a sequence of FAST_CALL to upward finally block */
while (i > 0) {
i--;
if (op_array->try_catch_array[i].finally_op &&
op_num >= op_array->try_catch_array[i].try_op &&
op_num < op_array->try_catch_array[i].finally_op - 1 &&
(dst_num < op_array->try_catch_array[i].try_op ||
dst_num > op_array->try_catch_array[i].finally_end)) {
opline = get_next_op(op_array);
opline->opcode = ZEND_FAST_CALL;
opline->result_type = IS_TMP_VAR;
opline->result.var = fast_call_var;
SET_UNUSED(opline->op1);
SET_UNUSED(opline->op2);
opline->op1.opline_num = op_array->try_catch_array[i].finally_op;
}
}
/* Finish the sequence with original opcode */
opline = get_next_op(op_array);
*opline = op_array->opcodes[op_num];
/* Replace original opcode with jump to this sequence */
opline = op_array->opcodes + op_num;
opline->opcode = ZEND_JMP;
SET_UNUSED(opline->op1);
SET_UNUSED(opline->op2);
opline->op1.opline_num = start_op;
break;
}
}
}
static void zend_resolve_finally_ret(zend_op_array *op_array, uint32_t op_num)
{
int i;
uint32_t catch_op_num = 0, finally_op_num = 0;
for (i = 0; i < op_array->last_try_catch; i++) {
if (op_array->try_catch_array[i].try_op > op_num) {
break;
}
if (op_num < op_array->try_catch_array[i].finally_op) {
finally_op_num = op_array->try_catch_array[i].finally_op;
}
if (op_num < op_array->try_catch_array[i].catch_op) {
catch_op_num = op_array->try_catch_array[i].catch_op;
}
}
if (finally_op_num && (!catch_op_num || catch_op_num >= finally_op_num)) {
/* in case of unhandled exception return to upward finally block */
op_array->opcodes[op_num].extended_value = ZEND_FAST_RET_TO_FINALLY;
op_array->opcodes[op_num].op2.opline_num = finally_op_num;
} else if (catch_op_num) {
/* in case of unhandled exception return to upward catch block */
op_array->opcodes[op_num].extended_value = ZEND_FAST_RET_TO_CATCH;
op_array->opcodes[op_num].op2.opline_num = catch_op_num;
}
}
static uint32_t zend_get_brk_cont_target(const zend_op_array *op_array, const zend_op *opline) {
int nest_levels = opline->op2.num;
int array_offset = opline->op1.num;
zend_brk_cont_element *jmp_to;
do {
jmp_to = &CG(context).brk_cont_array[array_offset];
if (nest_levels > 1) {
array_offset = jmp_to->parent;
}
} while (--nest_levels > 0);
return opline->opcode == ZEND_BRK ? jmp_to->brk : jmp_to->cont;
}
static void zend_resolve_finally_calls(zend_op_array *op_array)
{
uint32_t i, j;
zend_op *opline;
for (i = 0, j = op_array->last; i < j; i++) {
opline = op_array->opcodes + i;
switch (opline->opcode) {
case ZEND_RETURN:
case ZEND_RETURN_BY_REF:
case ZEND_GENERATOR_RETURN:
zend_resolve_finally_call(op_array, i, (uint32_t)-1);
break;
case ZEND_BRK:
case ZEND_CONT:
zend_resolve_finally_call(op_array, i, zend_get_brk_cont_target(op_array, opline));
break;
case ZEND_GOTO:
if (Z_TYPE_P(CT_CONSTANT_EX(op_array, opline->op2.constant)) != IS_LONG) {
ZEND_PASS_TWO_UPDATE_CONSTANT(op_array, opline->op2);
zend_resolve_goto_label(op_array, NULL, opline);
}
/* break omitted intentionally */
case ZEND_JMP:
zend_resolve_finally_call(op_array, i, opline->op1.opline_num);
break;
case ZEND_FAST_CALL:
zend_resolve_fast_call(op_array, i, i);
break;
case ZEND_FAST_RET:
zend_resolve_finally_ret(op_array, i);
break;
default:
break;
}
}
}
ZEND_API int pass_two(zend_op_array *op_array)
{
zend_op *opline, *end;
if (!ZEND_USER_CODE(op_array->type)) {
return 0;
}
if (op_array->fn_flags & ZEND_ACC_HAS_FINALLY_BLOCK) {
zend_resolve_finally_calls(op_array);
}
if (CG(compiler_options) & ZEND_COMPILE_EXTENDED_INFO) {
zend_update_extended_info(op_array);
}
if (CG(compiler_options) & ZEND_COMPILE_HANDLE_OP_ARRAY) {
zend_llist_apply_with_argument(&zend_extensions, (llist_apply_with_arg_func_t) zend_extension_op_array_handler, op_array);
}
if (CG(context).vars_size != op_array->last_var) {
op_array->vars = (zend_string**) erealloc(op_array->vars, sizeof(zend_string*)*op_array->last_var);
CG(context).vars_size = op_array->last_var;
}
if (CG(context).opcodes_size != op_array->last) {
op_array->opcodes = (zend_op *) erealloc(op_array->opcodes, sizeof(zend_op)*op_array->last);
CG(context).opcodes_size = op_array->last;
}
if (CG(context).literals_size != op_array->last_literal) {
op_array->literals = (zval*)erealloc(op_array->literals, sizeof(zval) * op_array->last_literal);
CG(context).literals_size = op_array->last_literal;
}
zend_generate_var_liveliness_info(op_array);
opline = op_array->opcodes;
end = opline + op_array->last;
while (opline < end) {
if (opline->op1_type == IS_CONST) {
ZEND_PASS_TWO_UPDATE_CONSTANT(op_array, opline->op1);
} else if (opline->op1_type & (IS_VAR|IS_TMP_VAR)) {
opline->op1.var = (uint32_t)(zend_intptr_t)ZEND_CALL_VAR_NUM(NULL, op_array->last_var + opline->op1.var);
}
if (opline->op2_type == IS_CONST) {
ZEND_PASS_TWO_UPDATE_CONSTANT(op_array, opline->op2);
} else if (opline->op2_type & (IS_VAR|IS_TMP_VAR)) {
opline->op2.var = (uint32_t)(zend_intptr_t)ZEND_CALL_VAR_NUM(NULL, op_array->last_var + opline->op2.var);
}
if (opline->result_type & (IS_VAR|IS_TMP_VAR)) {
opline->result.var = (uint32_t)(zend_intptr_t)ZEND_CALL_VAR_NUM(NULL, op_array->last_var + opline->result.var);
}
switch (opline->opcode) {
case ZEND_DECLARE_ANON_INHERITED_CLASS:
ZEND_PASS_TWO_UPDATE_JMP_TARGET(op_array, opline, opline->op1);
/* break omitted intentionally */
case ZEND_DECLARE_INHERITED_CLASS:
case ZEND_DECLARE_INHERITED_CLASS_DELAYED:
opline->extended_value = (uint32_t)(zend_intptr_t)ZEND_CALL_VAR_NUM(NULL, op_array->last_var + opline->extended_value);
break;
case ZEND_BRK:
case ZEND_CONT:
{
uint32_t jmp_target = zend_get_brk_cont_target(op_array, opline);
opline->opcode = ZEND_JMP;
opline->op1.opline_num = jmp_target;
opline->op2.num = 0;
ZEND_PASS_TWO_UPDATE_JMP_TARGET(op_array, opline, opline->op1);
}
break;
case ZEND_GOTO:
if (Z_TYPE_P(RT_CONSTANT(op_array, opline->op2)) != IS_LONG) {
zend_resolve_goto_label(op_array, NULL, opline);
}
/* break omitted intentionally */
case ZEND_JMP:
case ZEND_FAST_CALL:
case ZEND_DECLARE_ANON_CLASS:
ZEND_PASS_TWO_UPDATE_JMP_TARGET(op_array, opline, opline->op1);
break;
case ZEND_JMPZNZ:
/* absolute index to relative offset */
opline->extended_value = ZEND_OPLINE_NUM_TO_OFFSET(op_array, opline, opline->extended_value);
/* break omitted intentionally */
case ZEND_JMPZ:
case ZEND_JMPNZ:
case ZEND_JMPZ_EX:
case ZEND_JMPNZ_EX:
case ZEND_JMP_SET:
case ZEND_COALESCE:
case ZEND_NEW:
case ZEND_FE_RESET_R:
case ZEND_FE_RESET_RW:
case ZEND_ASSERT_CHECK:
ZEND_PASS_TWO_UPDATE_JMP_TARGET(op_array, opline, opline->op2);
break;
case ZEND_FE_FETCH_R:
case ZEND_FE_FETCH_RW:
opline->extended_value = ZEND_OPLINE_NUM_TO_OFFSET(op_array, opline, opline->extended_value);
break;
case ZEND_VERIFY_RETURN_TYPE:
if (op_array->fn_flags & ZEND_ACC_GENERATOR) {
MAKE_NOP(opline);
}
break;
case ZEND_RETURN:
case ZEND_RETURN_BY_REF:
if (op_array->fn_flags & ZEND_ACC_GENERATOR) {
opline->opcode = ZEND_GENERATOR_RETURN;
}
break;
}
ZEND_VM_SET_OPCODE_HANDLER(opline);
opline++;
}
op_array->fn_flags |= ZEND_ACC_DONE_PASS_TWO;
return 0;
}
int pass_two_wrapper(zval *el)
{
return pass_two((zend_op_array *) Z_PTR_P(el));
}
/* The following liveliness analyzing algorithm assumes that
* 1) temporary variables are defined before use
* 2) they have linear live-ranges without "holes"
* 3) Opcodes never use and define the same temorary variables
*/
typedef struct _op_var_info {
struct _op_var_info *next;
uint32_t var;
} op_var_info;
static zend_always_inline uint32_t liveliness_kill_var(zend_op_array *op_array, zend_op *cur_op, uint32_t var, uint32_t *Tstart, op_var_info **opTs)
{
uint32_t start = Tstart[var];
uint32_t end = cur_op - op_array->opcodes;
uint32_t count = 0;
uint32_t var_offset, j;
Tstart[var] = -1;
if (cur_op->opcode == ZEND_OP_DATA) {
end--;
}
start++;
if (op_array->opcodes[start].opcode == ZEND_OP_DATA
|| op_array->opcodes[start].opcode == ZEND_FE_FETCH_R
|| op_array->opcodes[start].opcode == ZEND_FE_FETCH_RW) {
start++;
}
if (start < end) {
op_var_info *new_opTs;
var_offset = (uint32_t)(zend_intptr_t)ZEND_CALL_VAR_NUM(NULL, op_array->last_var + var);
if (op_array->opcodes[end].opcode == ZEND_ROPE_END) {
var_offset |= ZEND_LIVE_ROPE;
} else if (op_array->opcodes[end].opcode == ZEND_END_SILENCE) {
var_offset |= ZEND_LIVE_SILENCE;
} else if (op_array->opcodes[end].opcode == ZEND_FE_FREE) {
var_offset |= ZEND_LIVE_LOOP;
}
if (opTs[start]) {
if (start > 0 && opTs[start-1] == opTs[start]) {
op_var_info *opT = opTs[start];
do {
count++;
opT = opT->next;
} while (opT);
count += 2;
} else {
count++;
}
} else {
count += 2;
}
new_opTs = zend_arena_alloc(&CG(arena), sizeof(op_var_info));
new_opTs->next = opTs[start];
new_opTs->var = var_offset;
opTs[start] = new_opTs;
for (j = start + 1; j < end; j++) {
if (opTs[j-1]->next == opTs[j]) {
opTs[j] = opTs[j-1];
} else {
if (opTs[j]) {
count++;
} else {
count += 2;
}
new_opTs = zend_arena_alloc(&CG(arena), sizeof(op_var_info));
new_opTs->next = opTs[j];
new_opTs->var = var_offset;
opTs[j] = new_opTs;
}
}
}
return count;
}
static zend_always_inline uint32_t *generate_var_liveliness_info_ex(zend_op_array *op_array, zend_bool done_pass_two)
{
zend_op *opline, *end;
uint32_t var, i, op_live_total = 0;
uint32_t *info, info_off = op_array->last + 1;
void *checkpoint = zend_arena_checkpoint(CG(arena));
uint32_t *Tstart = zend_arena_alloc(&CG(arena), sizeof(uint32_t) * op_array->T);
op_var_info **opTs = zend_arena_alloc(&CG(arena), sizeof(op_var_info *) * op_array->last);
memset(Tstart, -1, sizeof(uint32_t) * op_array->T);
memset(opTs, 0, sizeof(op_var_info *) * op_array->last);
opline = op_array->opcodes;
end = opline + op_array->last;
do {
if ((opline->result_type & (IS_VAR|IS_TMP_VAR))
&& !((opline)->result_type & EXT_TYPE_UNUSED)
/* the following opcodes are used in inline branching
* (and anyway always bool, so no need to free) and may
* not be defined depending on the taken branch */
&& opline->opcode != ZEND_BOOL
&& opline->opcode != ZEND_JMPZ_EX
&& opline->opcode != ZEND_JMPNZ_EX
/* These opcodes write the result of the true branch of a ternary, short
* ternary or coalesce and are immediately followed by the instructions
* for the false branch (where this result is not live) */
&& (opline->opcode != ZEND_QM_ASSIGN || (opline + 1)->opcode != ZEND_JMP)
&& opline->opcode != ZEND_JMP_SET
&& opline->opcode != ZEND_COALESCE
/* exception for opcache, it might nowhere use the temporary
* (anyway bool, so no need to free) */
&& opline->opcode != ZEND_CASE
/* the following opcodes reuse TMP created before */
&& opline->opcode != ZEND_ROPE_ADD
&& opline->opcode != ZEND_ADD_ARRAY_ELEMENT
&& opline->opcode != ZEND_SEPARATE
/* passes fast_call */
&& opline->opcode != ZEND_FAST_CALL
/* the following opcodes pass class_entry */
&& opline->opcode != ZEND_FETCH_CLASS
&& opline->opcode != ZEND_DECLARE_CLASS
&& opline->opcode != ZEND_DECLARE_INHERITED_CLASS
&& opline->opcode != ZEND_DECLARE_INHERITED_CLASS_DELAYED
&& opline->opcode != ZEND_DECLARE_ANON_CLASS
&& opline->opcode != ZEND_DECLARE_ANON_INHERITED_CLASS
) {
if (done_pass_two) {
var = EX_VAR_TO_NUM(opline->result.var) - op_array->last_var;
} else {
var = opline->result.var;
}
ZEND_ASSERT(Tstart[var] == (unsigned) -1);
if (opline->opcode == ZEND_NEW) {
/* Objects created via ZEND_NEW are only fully initialized
* after the DO_FCALL (constructor call) */
Tstart[var] = opline->op2.opline_num - 1;
} else {
Tstart[var] = opline - op_array->opcodes;
}
}
if (opline->op1_type & (IS_VAR|IS_TMP_VAR)) {
if (done_pass_two) {
var = EX_VAR_TO_NUM(opline->op1.var) - op_array->last_var;
} else {
var = opline->op1.var;
}
if (Tstart[var] != (uint32_t)-1
/* the following opcodes don't free TMP */
&& opline->opcode != ZEND_ROPE_ADD
&& opline->opcode != ZEND_SEPARATE
&& opline->opcode != ZEND_FETCH_LIST
&& opline->opcode != ZEND_CASE
&& opline->opcode != ZEND_FE_FETCH_R
&& opline->opcode != ZEND_FE_FETCH_RW) {
op_live_total += liveliness_kill_var(op_array, opline, var, Tstart, opTs);
}
}
if (opline->op2_type & (IS_VAR|IS_TMP_VAR)) {
if (done_pass_two) {
var = EX_VAR_TO_NUM(opline->op2.var) - op_array->last_var;