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zend_opcode.c
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/*
+----------------------------------------------------------------------+
| Zend Engine |
+----------------------------------------------------------------------+
| Copyright (c) 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@php.net> |
| Zeev Suraski <zeev@php.net> |
| Dmitry Stogov <dmitry@php.net> |
+----------------------------------------------------------------------+
*/
#include <stdio.h>
#include "zend.h"
#include "zend_alloc.h"
#include "zend_compile.h"
#include "zend_extensions.h"
#include "zend_API.h"
#include "zend_sort.h"
#include "zend_constants.h"
#include "zend_observer.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);
}
}
void init_op_array(zend_op_array *op_array, uint8_t 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 = emalloc(initial_ops_size * sizeof(zend_op));
op_array->last_var = 0;
op_array->vars = NULL;
op_array->T = 0;
op_array->function_name = NULL;
op_array->filename = zend_string_copy(zend_get_compiled_filename());
op_array->doc_comment = NULL;
op_array->attributes = 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->prop_info = NULL;
op_array->live_range = NULL;
op_array->try_catch_array = NULL;
op_array->last_live_range = 0;
op_array->static_variables = NULL;
ZEND_MAP_PTR_INIT(op_array->static_variables_ptr, NULL);
op_array->last_try_catch = 0;
op_array->fn_flags = 0;
op_array->last_literal = 0;
op_array->literals = NULL;
op_array->num_dynamic_func_defs = 0;
op_array->dynamic_func_defs = NULL;
ZEND_MAP_PTR_INIT(op_array->run_time_cache, NULL);
op_array->cache_size = zend_op_array_extension_handles * sizeof(void*);
memset(op_array->reserved, 0, ZEND_MAX_RESERVED_RESOURCES * sizeof(void*));
if (zend_extension_flags & ZEND_EXTENSIONS_HAVE_OP_ARRAY_CTOR) {
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)
{
zval tmp;
ZVAL_PTR(&tmp, function);
zend_function_dtor(&tmp);
}
ZEND_API void zend_type_release(zend_type type, bool persistent) {
if (ZEND_TYPE_HAS_LIST(type)) {
zend_type *list_type;
ZEND_TYPE_LIST_FOREACH(ZEND_TYPE_LIST(type), list_type) {
zend_type_release(*list_type, persistent);
} ZEND_TYPE_LIST_FOREACH_END();
if (!ZEND_TYPE_USES_ARENA(type)) {
pefree(ZEND_TYPE_LIST(type), persistent);
}
} else if (ZEND_TYPE_HAS_NAME(type)) {
zend_string_release(ZEND_TYPE_NAME(type));
}
}
void zend_free_internal_arg_info(zend_internal_function *function) {
if ((function->fn_flags & (ZEND_ACC_HAS_RETURN_TYPE|ZEND_ACC_HAS_TYPE_HINTS)) &&
function->arg_info) {
uint32_t i;
uint32_t num_args = function->num_args + 1;
zend_internal_arg_info *arg_info = function->arg_info - 1;
if (function->fn_flags & ZEND_ACC_VARIADIC) {
num_args++;
}
for (i = 0 ; i < num_args; i++) {
zend_type_release(arg_info[i].type, /* persistent */ 1);
}
free(arg_info);
}
}
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_ex(function->common.function_name, 1);
/* For methods this will be called explicitly. */
if (!function->common.scope) {
zend_free_internal_arg_info(&function->internal_function);
if (function->common.attributes) {
zend_hash_release(function->common.attributes);
function->common.attributes = NULL;
}
}
if (function->common.doc_comment) {
zend_string_release_ex(function->common.doc_comment, 1);
function->common.doc_comment = NULL;
}
if (!(function->common.fn_flags & ZEND_ACC_ARENA_ALLOCATED)) {
pefree(function, 1);
}
}
}
ZEND_API void zend_cleanup_internal_class_data(zend_class_entry *ce)
{
if (ZEND_MAP_PTR(ce->static_members_table) && CE_STATIC_MEMBERS(ce)) {
zval *static_members = CE_STATIC_MEMBERS(ce);
zval *p = static_members;
zval *end = p + ce->default_static_members_count;
ZEND_MAP_PTR_SET(ce->static_members_table, NULL);
while (p != end) {
if (UNEXPECTED(Z_ISREF_P(p))) {
zend_property_info *prop_info;
ZEND_REF_FOREACH_TYPE_SOURCES(Z_REF_P(p), prop_info) {
if (prop_info->ce == ce && p - static_members == prop_info->offset) {
ZEND_REF_DEL_TYPE_SOURCE(Z_REF_P(p), prop_info);
break; /* stop iteration here, the array might be realloc()'ed */
}
} ZEND_REF_FOREACH_TYPE_SOURCES_END();
}
i_zval_ptr_dtor(p);
p++;
}
efree(static_members);
}
}
static void _destroy_zend_class_traits_info(zend_class_entry *ce)
{
uint32_t i;
for (i = 0; i < ce->num_traits; i++) {
zend_string_release_ex(ce->trait_names[i].name, 0);
zend_string_release_ex(ce->trait_names[i].lc_name, 0);
}
efree(ce->trait_names);
if (ce->trait_aliases) {
i = 0;
while (ce->trait_aliases[i]) {
if (ce->trait_aliases[i]->trait_method.method_name) {
zend_string_release_ex(ce->trait_aliases[i]->trait_method.method_name, 0);
}
if (ce->trait_aliases[i]->trait_method.class_name) {
zend_string_release_ex(ce->trait_aliases[i]->trait_method.class_name, 0);
}
if (ce->trait_aliases[i]->alias) {
zend_string_release_ex(ce->trait_aliases[i]->alias, 0);
}
efree(ce->trait_aliases[i]);
i++;
}
efree(ce->trait_aliases);
}
if (ce->trait_precedences) {
uint32_t j;
i = 0;
while (ce->trait_precedences[i]) {
zend_string_release_ex(ce->trait_precedences[i]->trait_method.method_name, 0);
zend_string_release_ex(ce->trait_precedences[i]->trait_method.class_name, 0);
for (j = 0; j < ce->trait_precedences[i]->num_excludes; j++) {
zend_string_release_ex(ce->trait_precedences[i]->exclude_class_names[j], 0);
}
efree(ce->trait_precedences[i]);
i++;
}
efree(ce->trait_precedences);
}
}
ZEND_API void zend_cleanup_mutable_class_data(zend_class_entry *ce)
{
zend_class_mutable_data *mutable_data = ZEND_MAP_PTR_GET_IMM(ce->mutable_data);
if (mutable_data) {
HashTable *constants_table;
zval *p;
constants_table = mutable_data->constants_table;
if (constants_table && constants_table != &ce->constants_table) {
zend_class_constant *c;
ZEND_HASH_MAP_FOREACH_PTR(constants_table, c) {
if (c->ce == ce || (Z_CONSTANT_FLAGS(c->value) & CONST_OWNED)) {
zval_ptr_dtor_nogc(&c->value);
}
} ZEND_HASH_FOREACH_END();
zend_hash_destroy(constants_table);
mutable_data->constants_table = NULL;
}
p = mutable_data->default_properties_table;
if (p && p != ce->default_properties_table) {
zval *end = p + ce->default_properties_count;
while (p < end) {
zval_ptr_dtor_nogc(p);
p++;
}
mutable_data->default_properties_table = NULL;
}
if (mutable_data->backed_enum_table) {
zend_hash_release(mutable_data->backed_enum_table);
mutable_data->backed_enum_table = NULL;
}
ZEND_MAP_PTR_SET_IMM(ce->mutable_data, NULL);
}
}
ZEND_API void destroy_zend_class(zval *zv)
{
zend_property_info *prop_info;
zend_class_entry *ce = Z_PTR_P(zv);
zend_function *fn;
if (ce->ce_flags & ZEND_ACC_IMMUTABLE) {
return;
}
/* We don't increase the refcount for class aliases,
* skip the destruction of aliases entirely. */
if (UNEXPECTED(Z_TYPE_INFO_P(zv) == IS_ALIAS_PTR)) {
return;
}
if (ce->ce_flags & ZEND_ACC_FILE_CACHED) {
zend_class_constant *c;
zval *p, *end;
ZEND_HASH_MAP_FOREACH_PTR(&ce->constants_table, c) {
if (c->ce == ce) {
zval_ptr_dtor_nogc(&c->value);
}
} ZEND_HASH_FOREACH_END();
if (ce->default_properties_table) {
p = ce->default_properties_table;
end = p + ce->default_properties_count;
while (p < end) {
zval_ptr_dtor_nogc(p);
p++;
}
}
return;
}
ZEND_ASSERT(ce->refcount > 0);
if (--ce->refcount > 0) {
return;
}
switch (ce->type) {
case ZEND_USER_CLASS:
if (!(ce->ce_flags & ZEND_ACC_CACHED)) {
if (ce->parent_name && !(ce->ce_flags & ZEND_ACC_RESOLVED_PARENT)) {
zend_string_release_ex(ce->parent_name, 0);
}
zend_string_release_ex(ce->name, 0);
zend_string_release_ex(ce->info.user.filename, 0);
if (ce->doc_comment) {
zend_string_release_ex(ce->doc_comment, 0);
}
if (ce->attributes) {
zend_hash_release(ce->attributes);
}
if (ce->num_interfaces > 0 && !(ce->ce_flags & ZEND_ACC_RESOLVED_INTERFACES)) {
uint32_t i;
for (i = 0; i < ce->num_interfaces; i++) {
zend_string_release_ex(ce->interface_names[i].name, 0);
zend_string_release_ex(ce->interface_names[i].lc_name, 0);
}
efree(ce->interface_names);
}
if (ce->num_traits > 0) {
_destroy_zend_class_traits_info(ce);
}
}
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);
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) {
ZEND_ASSERT(!Z_ISREF_P(p));
i_zval_ptr_dtor(p);
p++;
}
efree(ce->default_static_members_table);
}
ZEND_HASH_MAP_FOREACH_PTR(&ce->properties_info, prop_info) {
if (prop_info->ce == ce) {
zend_string_release_ex(prop_info->name, 0);
if (prop_info->doc_comment) {
zend_string_release_ex(prop_info->doc_comment, 0);
}
if (prop_info->attributes) {
zend_hash_release(prop_info->attributes);
}
zend_type_release(prop_info->type, /* persistent */ 0);
if (prop_info->hooks) {
for (uint32_t i = 0; i < ZEND_PROPERTY_HOOK_COUNT; i++) {
if (prop_info->hooks[i]) {
destroy_op_array(&prop_info->hooks[i]->op_array);
}
}
}
}
} ZEND_HASH_FOREACH_END();
zend_hash_destroy(&ce->properties_info);
zend_hash_destroy(&ce->function_table);
if (zend_hash_num_elements(&ce->constants_table)) {
zend_class_constant *c;
ZEND_HASH_MAP_FOREACH_PTR(&ce->constants_table, c) {
if (c->ce == ce || (Z_CONSTANT_FLAGS(c->value) & CONST_OWNED)) {
zval_ptr_dtor_nogc(&c->value);
if (c->doc_comment) {
zend_string_release_ex(c->doc_comment, 0);
}
if (c->attributes) {
zend_hash_release(c->attributes);
}
}
} ZEND_HASH_FOREACH_END();
}
zend_hash_destroy(&ce->constants_table);
if (ce->num_interfaces > 0 && (ce->ce_flags & ZEND_ACC_RESOLVED_INTERFACES)) {
efree(ce->interfaces);
}
if (ce->backed_enum_table) {
zend_hash_release(ce->backed_enum_table);
}
break;
case ZEND_INTERNAL_CLASS:
if (ce->doc_comment) {
zend_string_release_ex(ce->doc_comment, 1);
}
if (ce->backed_enum_table) {
zend_hash_release(ce->backed_enum_table);
}
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_MAP_FOREACH_PTR(&ce->properties_info, prop_info) {
if (prop_info->ce == ce) {
zend_string_release(prop_info->name);
zend_type_release(prop_info->type, /* persistent */ 1);
if (prop_info->attributes) {
zend_hash_release(prop_info->attributes);
}
free(prop_info);
}
} ZEND_HASH_FOREACH_END();
zend_hash_destroy(&ce->properties_info);
zend_string_release_ex(ce->name, 1);
/* TODO: eliminate this loop for classes without functions with arg_info / attributes */
ZEND_HASH_MAP_FOREACH_PTR(&ce->function_table, fn) {
if (fn->common.scope == ce) {
if (fn->common.fn_flags & (ZEND_ACC_HAS_RETURN_TYPE|ZEND_ACC_HAS_TYPE_HINTS)) {
zend_free_internal_arg_info(&fn->internal_function);
}
if (fn->common.attributes) {
zend_hash_release(fn->common.attributes);
fn->common.attributes = NULL;
}
}
} ZEND_HASH_FOREACH_END();
zend_hash_destroy(&ce->function_table);
if (zend_hash_num_elements(&ce->constants_table)) {
zend_class_constant *c;
ZEND_HASH_MAP_FOREACH_PTR(&ce->constants_table, c) {
if (c->ce == ce) {
if (Z_TYPE(c->value) == IS_CONSTANT_AST) {
/* We marked this as IMMUTABLE, but do need to free it when the
* class is destroyed. */
ZEND_ASSERT(Z_ASTVAL(c->value)->kind == ZEND_AST_CONST_ENUM_INIT);
free(Z_AST(c->value));
} else {
zval_internal_ptr_dtor(&c->value);
}
if (c->doc_comment) {
zend_string_release_ex(c->doc_comment, 1);
}
if (c->attributes) {
zend_hash_release(c->attributes);
}
}
free(c);
} ZEND_HASH_FOREACH_END();
zend_hash_destroy(&ce->constants_table);
}
if (ce->iterator_funcs_ptr) {
free(ce->iterator_funcs_ptr);
}
if (ce->arrayaccess_funcs_ptr) {
free(ce->arrayaccess_funcs_ptr);
}
if (ce->num_interfaces > 0) {
free(ce->interfaces);
}
if (ce->properties_info_table) {
free(ce->properties_info_table);
}
if (ce->attributes) {
zend_hash_release(ce->attributes);
}
free(ce);
break;
}
}
void zend_class_add_ref(zval *zv)
{
zend_class_entry *ce = Z_PTR_P(zv);
if (Z_TYPE_P(zv) != IS_ALIAS_PTR && !(ce->ce_flags & ZEND_ACC_IMMUTABLE)) {
ce->refcount++;
}
}
ZEND_API void zend_destroy_static_vars(zend_op_array *op_array)
{
if (ZEND_MAP_PTR(op_array->static_variables_ptr)) {
HashTable *ht = ZEND_MAP_PTR_GET(op_array->static_variables_ptr);
if (ht) {
zend_array_destroy(ht);
ZEND_MAP_PTR_SET(op_array->static_variables_ptr, NULL);
}
}
}
ZEND_API void destroy_op_array(zend_op_array *op_array)
{
uint32_t i;
if ((op_array->fn_flags & ZEND_ACC_HEAP_RT_CACHE)
&& ZEND_MAP_PTR(op_array->run_time_cache)) {
efree(ZEND_MAP_PTR(op_array->run_time_cache));
}
if (op_array->function_name) {
zend_string_release_ex(op_array->function_name, 0);
}
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_ex(op_array->vars[i], 0);
}
efree(op_array->vars);
}
if (op_array->literals) {
zval *literal = op_array->literals;
zval *end = literal + op_array->last_literal;
while (literal < end) {
zval_ptr_dtor_nogc(literal);
literal++;
}
if (ZEND_USE_ABS_CONST_ADDR
|| !(op_array->fn_flags & ZEND_ACC_DONE_PASS_TWO)) {
efree(op_array->literals);
}
}
efree(op_array->opcodes);
zend_string_release_ex(op_array->filename, 0);
if (op_array->doc_comment) {
zend_string_release_ex(op_array->doc_comment, 0);
}
if (op_array->attributes) {
zend_hash_release(op_array->attributes);
}
if (op_array->live_range) {
efree(op_array->live_range);
}
if (op_array->try_catch_array) {
efree(op_array->try_catch_array);
}
if (zend_extension_flags & ZEND_EXTENSIONS_HAVE_OP_ARRAY_DTOR) {
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) {
uint32_t num_args = op_array->num_args;
zend_arg_info *arg_info = op_array->arg_info;
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_ex(arg_info[i].name, 0);
}
zend_type_release(arg_info[i].type, /* persistent */ 0);
}
efree(arg_info);
}
if (op_array->static_variables) {
zend_array_destroy(op_array->static_variables);
}
if (op_array->num_dynamic_func_defs) {
for (i = 0; i < op_array->num_dynamic_func_defs; i++) {
destroy_op_array(op_array->dynamic_func_defs[i]);
}
efree(op_array->dynamic_func_defs);
}
}
static void zend_update_extended_stmts(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 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 emit_live_range_raw(
zend_op_array *op_array, uint32_t var_num, uint32_t kind, uint32_t start, uint32_t end) {
zend_live_range *range;
op_array->last_live_range++;
op_array->live_range = erealloc(op_array->live_range,
sizeof(zend_live_range) * op_array->last_live_range);
ZEND_ASSERT(start < end);
range = &op_array->live_range[op_array->last_live_range - 1];
range->var = EX_NUM_TO_VAR(op_array->last_var + var_num);
range->var |= kind;
range->start = start;
range->end = end;
}
static void emit_live_range(
zend_op_array *op_array, uint32_t var_num, uint32_t start, uint32_t end,
zend_needs_live_range_cb needs_live_range) {
zend_op *def_opline = &op_array->opcodes[start], *orig_def_opline = def_opline;
zend_op *use_opline = &op_array->opcodes[end];
uint32_t kind;
switch (def_opline->opcode) {
/* These should never be the first def. */
case ZEND_ADD_ARRAY_ELEMENT:
case ZEND_ADD_ARRAY_UNPACK:
case ZEND_ROPE_ADD:
ZEND_UNREACHABLE();
return;
/* Result is boolean, it doesn't have to be destroyed. */
case ZEND_JMPZ_EX:
case ZEND_JMPNZ_EX:
case ZEND_BOOL:
case ZEND_BOOL_NOT:
/* Classes don't have to be destroyed. */
case ZEND_FETCH_CLASS:
case ZEND_DECLARE_ANON_CLASS:
/* FAST_CALLs don't have to be destroyed. */
case ZEND_FAST_CALL:
return;
case ZEND_BEGIN_SILENCE:
kind = ZEND_LIVE_SILENCE;
start++;
break;
case ZEND_ROPE_INIT:
kind = ZEND_LIVE_ROPE;
/* ROPE live ranges include the generating opcode. */
def_opline--;
break;
case ZEND_FE_RESET_R:
case ZEND_FE_RESET_RW:
kind = ZEND_LIVE_LOOP;
start++;
break;
/* Objects created via ZEND_NEW are only fully initialized
* after the DO_FCALL (constructor call).
* We are creating two live-ranges: ZEND_LINE_NEW for uninitialized
* part, and ZEND_LIVE_TMPVAR for initialized.
*/
case ZEND_NEW:
{
int level = 0;
uint32_t orig_start = start;
while (def_opline + 1 < use_opline) {
def_opline++;
start++;
switch (def_opline->opcode) {
case ZEND_INIT_FCALL:
case ZEND_INIT_FCALL_BY_NAME:
case ZEND_INIT_NS_FCALL_BY_NAME:
case ZEND_INIT_DYNAMIC_CALL:
case ZEND_INIT_USER_CALL:
case ZEND_INIT_METHOD_CALL:
case ZEND_INIT_STATIC_METHOD_CALL:
case ZEND_INIT_PARENT_PROPERTY_HOOK_CALL:
case ZEND_NEW:
level++;
break;
case ZEND_DO_FCALL:
case ZEND_DO_FCALL_BY_NAME:
case ZEND_DO_ICALL:
case ZEND_DO_UCALL:
if (level == 0) {
goto done;
}
level--;
break;
}
}
done:
emit_live_range_raw(op_array, var_num, ZEND_LIVE_NEW, orig_start + 1, start + 1);
if (start + 1 == end) {
/* Trivial live-range, no need to store it. */
return;
}
}
ZEND_FALLTHROUGH;
default:
start++;
kind = ZEND_LIVE_TMPVAR;
/* Check hook to determine whether a live range is necessary,
* e.g. based on type info. */
if (needs_live_range && !needs_live_range(op_array, orig_def_opline)) {
return;
}
break;
case ZEND_COPY_TMP:
{
/* COPY_TMP has a split live-range: One from the definition until the use in
* "null" branch, and another from the start of the "non-null" branch to the
* FREE opcode. */
uint32_t rt_var_num = EX_NUM_TO_VAR(op_array->last_var + var_num);
if (needs_live_range && !needs_live_range(op_array, orig_def_opline)) {
return;
}
kind = ZEND_LIVE_TMPVAR;
if (use_opline->opcode != ZEND_FREE) {
/* This can happen if one branch of the coalesce has been optimized away.
* In this case we should emit a normal live-range instead. */
start++;
break;
}
zend_op *block_start_op = use_opline;
while ((block_start_op-1)->opcode == ZEND_FREE) {
block_start_op--;
}
start = block_start_op - op_array->opcodes;
if (start != end) {
emit_live_range_raw(op_array, var_num, kind, start, end);
}
do {
use_opline--;
/* The use might have been optimized away, in which case we will hit the def
* instead. */
if (use_opline->opcode == ZEND_COPY_TMP && use_opline->result.var == rt_var_num) {
start = def_opline + 1 - op_array->opcodes;
emit_live_range_raw(op_array, var_num, kind, start, end);
return;
}
} while (!(
((use_opline->op1_type & (IS_TMP_VAR|IS_VAR)) && use_opline->op1.var == rt_var_num) ||
((use_opline->op2_type & (IS_TMP_VAR|IS_VAR)) && use_opline->op2.var == rt_var_num)
));
start = def_opline + 1 - op_array->opcodes;
end = use_opline - op_array->opcodes;
emit_live_range_raw(op_array, var_num, kind, start, end);
return;
}
}
emit_live_range_raw(op_array, var_num, kind, start, end);
}
static bool is_fake_def(zend_op *opline) {
/* These opcodes only modify the result, not create it. */
return opline->opcode == ZEND_ROPE_ADD
|| opline->opcode == ZEND_ADD_ARRAY_ELEMENT
|| opline->opcode == ZEND_ADD_ARRAY_UNPACK;
}
static bool keeps_op1_alive(zend_op *opline) {
/* These opcodes don't consume their OP1 operand,
* it is later freed by something else. */
if (opline->opcode == ZEND_CASE
|| opline->opcode == ZEND_CASE_STRICT
|| opline->opcode == ZEND_SWITCH_LONG
|| opline->opcode == ZEND_SWITCH_STRING
|| opline->opcode == ZEND_MATCH
|| opline->opcode == ZEND_MATCH_ERROR
|| opline->opcode == ZEND_FETCH_LIST_R
|| opline->opcode == ZEND_FETCH_LIST_W
|| opline->opcode == ZEND_COPY_TMP) {
return 1;
}
ZEND_ASSERT(opline->opcode != ZEND_FE_FETCH_R
&& opline->opcode != ZEND_FE_FETCH_RW
&& opline->opcode != ZEND_VERIFY_RETURN_TYPE
&& opline->opcode != ZEND_BIND_LEXICAL
&& opline->opcode != ZEND_ROPE_ADD);
return 0;
}
/* Live ranges must be sorted by increasing start opline */
static int cmp_live_range(const zend_live_range *a, const zend_live_range *b) {
return a->start - b->start;
}
static void swap_live_range(zend_live_range *a, zend_live_range *b) {
uint32_t tmp;
tmp = a->var;
a->var = b->var;
b->var = tmp;
tmp = a->start;
a->start = b->start;
b->start = tmp;
tmp = a->end;
a->end = b->end;
b->end = tmp;
}
static void zend_calc_live_ranges(
zend_op_array *op_array, zend_needs_live_range_cb needs_live_range) {
uint32_t opnum = op_array->last;
zend_op *opline = &op_array->opcodes[opnum];
ALLOCA_FLAG(use_heap)
uint32_t var_offset = op_array->last_var;
uint32_t *last_use = do_alloca(sizeof(uint32_t) * op_array->T, use_heap);
memset(last_use, -1, sizeof(uint32_t) * op_array->T);
ZEND_ASSERT(!op_array->live_range);
while (opnum > 0) {
opnum--;
opline--;
/* SEPARATE always redeclares its op1. For the purposes of live-ranges,
* its declaration is irrelevant. Don't terminate the current live-range
* to avoid breaking special handling of COPY_TMP. */
if (opline->opcode == ZEND_SEPARATE) {
ZEND_ASSERT(opline->op1.var == opline->result.var);
continue;
}
if ((opline->result_type & (IS_TMP_VAR|IS_VAR)) && !is_fake_def(opline)) {
uint32_t var_num = EX_VAR_TO_NUM(opline->result.var) - var_offset;
/* Defs without uses can occur for two reasons: Either because the result is
* genuinely unused (e.g. omitted FREE opcode for an unused boolean result), or
* because there are multiple defining opcodes (e.g. JMPZ_EX and QM_ASSIGN), in
* which case the last one starts the live range. As such, we can simply ignore
* missing uses here. */
if (EXPECTED(last_use[var_num] != (uint32_t) -1)) {
/* Skip trivial live-range */
if (opnum + 1 != last_use[var_num]) {
uint32_t num;
#if 1
/* OP_DATA uses only op1 operand */
ZEND_ASSERT(opline->opcode != ZEND_OP_DATA);
num = opnum;
#else
/* OP_DATA is really part of the previous opcode. */
num = opnum - (opline->opcode == ZEND_OP_DATA);
#endif
emit_live_range(op_array, var_num, num, last_use[var_num], needs_live_range);
}
last_use[var_num] = (uint32_t) -1;
}
}
if ((opline->op1_type & (IS_TMP_VAR|IS_VAR))) {
uint32_t var_num = EX_VAR_TO_NUM(opline->op1.var) - var_offset;
if (EXPECTED(last_use[var_num] == (uint32_t) -1)) {
if (EXPECTED(!keeps_op1_alive(opline))) {
/* OP_DATA is really part of the previous opcode. */
last_use[var_num] = opnum - (opline->opcode == ZEND_OP_DATA);
}
}
}
if (opline->op2_type & (IS_TMP_VAR|IS_VAR)) {
uint32_t var_num = EX_VAR_TO_NUM(opline->op2.var) - var_offset;
if (UNEXPECTED(opline->opcode == ZEND_FE_FETCH_R
|| opline->opcode == ZEND_FE_FETCH_RW)) {
/* OP2 of FE_FETCH is actually a def, not a use. */
if (last_use[var_num] != (uint32_t) -1) {
if (opnum + 1 != last_use[var_num]) {
emit_live_range(
op_array, var_num, opnum, last_use[var_num], needs_live_range);
}
last_use[var_num] = (uint32_t) -1;
}
} else if (EXPECTED(last_use[var_num] == (uint32_t) -1)) {
#if 1
/* OP_DATA uses only op1 operand */
ZEND_ASSERT(opline->opcode != ZEND_OP_DATA);
last_use[var_num] = opnum;
#else
/* OP_DATA is really part of the previous opcode. */
last_use[var_num] = opnum - (opline->opcode == ZEND_OP_DATA);
#endif
}