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php-src/Zend/zend_opcode.c
Nikita Popov e011952576
Preload unlinked classes, remove preload autoload (#7311) 
Currently, classes that can't be linked get moved back into the original script
and are not preloaded. As such classes may be referenced from functions that
did get preloaded, there is a preload autoload mechanism to load them at
runtime.

Since PHP 8.1, we can safely preload unlinked classes, which will then go
through usual lazy loading. This means that we no longer need the preload
autoload mechanism. However, we need to be careful not to modify any hash
table buckets in-place, and should create new buckets for lazy loaded classes.
2021-07-28 14:27:58 +02:00

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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_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, 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 = 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->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) {
if (ZEND_TYPE_HAS_NAME(*list_type)) {
zend_string_release(ZEND_TYPE_NAME(*list_type));
}
} 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.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_FOREACH_PTR(constants_table, c) {
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;
}
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;
}
if (ce->ce_flags & ZEND_ACC_FILE_CACHED) {
zend_class_constant *c;
zval *p, *end;
ZEND_HASH_FOREACH_PTR(&ce->constants_table, c) {
if (c->ce == ce) {
zval_ptr_dtor_nogc(&c->value);
}
} ZEND_HASH_FOREACH_END();
p = ce->default_properties_table;
end = p + ce->default_properties_count;
while (p < end) {
zval_ptr_dtor_nogc(p);
p++;
}
return;
}
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->info.user.doc_comment) {
zend_string_release_ex(ce->info.user.doc_comment, 0);
}
if (ce->attributes) {
zend_hash_release(ce->attributes);
}
if (ce->backed_enum_table) {
zend_hash_release(ce->backed_enum_table);
}
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_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);
}
} 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_FOREACH_PTR(&ce->constants_table, c) {
if (c->ce == ce) {
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);
}
break;
case ZEND_INTERNAL_CLASS:
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_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);
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 */
ZEND_HASH_FOREACH_PTR(&ce->function_table, fn) {
if ((fn->common.fn_flags & (ZEND_ACC_HAS_RETURN_TYPE|ZEND_ACC_HAS_TYPE_HINTS)) &&
fn->common.scope == ce) {
zend_free_internal_arg_info(&fn->internal_function);
}
} ZEND_HASH_FOREACH_END();
zend_hash_destroy(&ce->function_table);
if (zend_hash_num_elements(&ce->constants_table)) {
zend_class_constant *c;
ZEND_HASH_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->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 (!(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++) {
/* Closures overwrite static_variables in their copy.
* Make sure to destroy them when the prototype function is destroyed. */
if (op_array->dynamic_func_defs[i]->static_variables
&& (op_array->dynamic_func_defs[i]->fn_flags & ZEND_ACC_CLOSURE)) {
zend_array_destroy(op_array->dynamic_func_defs[i]->static_variables);
op_array->dynamic_func_defs[i]->static_variables = NULL;
}
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++;
if (def_opline->opcode == ZEND_DO_FCALL) {
if (level == 0) {
break;
}
level--;
} else {
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_NEW:
level++;
break;
case ZEND_DO_ICALL:
case ZEND_DO_UCALL:
case ZEND_DO_FCALL_BY_NAME:
level--;
break;
}
}
}
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);
zend_op *block_start_op = use_opline;
if (needs_live_range && !needs_live_range(op_array, orig_def_opline)) {
return;
}
while ((block_start_op-1)->opcode == ZEND_FREE) {
block_start_op--;
}
kind = ZEND_LIVE_TMPVAR;
start = block_start_op - op_array->opcodes;
if (start != end) {
emit_live_range_raw(op_array, var_num, kind, start, end);
}
do {
use_opline--;
} 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_MATCH
|| opline->opcode == ZEND_FETCH_LIST_R
|| opline->opcode == ZEND_COPY_TMP) {
return 1;
}
ZEND_ASSERT(opline->opcode != ZEND_SWITCH_STRING
&& opline->opcode != ZEND_FE_FETCH_R
&& opline->opcode != ZEND_FE_FETCH_RW
&& opline->opcode != ZEND_FETCH_LIST_W
&& 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--;
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
}
}
}
if (op_array->last_live_range > 1) {
zend_live_range *r1 = op_array->live_range;
zend_live_range *r2 = r1 + op_array->last_live_range - 1;
/* In most cases we need just revert the array */
while (r1 < r2) {
swap_live_range(r1, r2);
r1++;
r2--;
}
r1 = op_array->live_range;
r2 = r1 + op_array->last_live_range - 1;
while (r1 < r2) {
if (r1->start > (r1+1)->start) {
zend_sort(r1, r2 - r1 + 1, sizeof(zend_live_range),
(compare_func_t) cmp_live_range, (swap_func_t) swap_live_range);
break;
}
r1++;
}
}
free_alloca(last_use, use_heap);
}
ZEND_API void zend_recalc_live_ranges(
zend_op_array *op_array, zend_needs_live_range_cb needs_live_range) {
/* We assume that we never create live-ranges where there were none before. */
ZEND_ASSERT(op_array->live_range);
efree(op_array->live_range);
op_array->live_range = NULL;
op_array->last_live_range = 0;
zend_calc_live_ranges(op_array, needs_live_range);
}
ZEND_API void pass_two(zend_op_array *op_array)
{
zend_op *opline, *end;
if (!ZEND_USER_CODE(op_array->type)) {
return;
}
if (CG(compiler_options) & ZEND_COMPILE_EXTENDED_STMT) {
zend_update_extended_stmts(op_array);
}
if (CG(compiler_options) & ZEND_COMPILE_HANDLE_OP_ARRAY) {
if (zend_extension_flags & ZEND_EXTENSIONS_HAVE_OP_ARRAY_HANDLER) {
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 ZEND_USE_ABS_CONST_ADDR
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;
}
#else
op_array->opcodes = (zend_op *) erealloc(op_array->opcodes,
ZEND_MM_ALIGNED_SIZE_EX(sizeof(zend_op) * op_array->last, 16) +
sizeof(zval) * op_array->last_literal);
if (op_array->literals) {
memcpy(((char*)op_array->opcodes) + ZEND_MM_ALIGNED_SIZE_EX(sizeof(zend_op) * op_array->last, 16),
op_array->literals, sizeof(zval) * op_array->last_literal);
efree(op_array->literals);
op_array->literals = (zval*)(((char*)op_array->opcodes) + ZEND_MM_ALIGNED_SIZE_EX(sizeof(zend_op) * op_array->last, 16));
}
CG(context).opcodes_size = op_array->last;
CG(context).literals_size = op_array->last_literal;
#endif
/* Needs to be set directly after the opcode/literal reallocation, to ensure destruction
* happens correctly if any of the following fixups generate a fatal error. */
op_array->fn_flags |= ZEND_ACC_DONE_PASS_TWO;
opline = op_array->opcodes;
end = opline + op_array->last;
while (opline < end) {
switch (opline->opcode) {
case ZEND_RECV_INIT:
{
zval *val = CT_CONSTANT(opline->op2);
if (Z_TYPE_P(val) == IS_CONSTANT_AST) {
uint32_t slot = ZEND_MM_ALIGNED_SIZE_EX(op_array->cache_size, 8);
Z_CACHE_SLOT_P(val) = slot;
op_array->cache_size += sizeof(zval);
}
}
break;
case ZEND_FAST_CALL:
opline->op1.opline_num = op_array->try_catch_array[opline->op1.num].finally_op;
ZEND_PASS_TWO_UPDATE_JMP_TARGET(op_array, opline, opline->op1);
break;
case ZEND_BRK:
case ZEND_CONT:
{
uint32_t jmp_target = zend_get_brk_cont_target(op_array, opline);
if (op_array->fn_flags & ZEND_ACC_HAS_FINALLY_BLOCK) {
zend_check_finally_breakout(op_array, opline - op_array->opcodes, jmp_target);
}
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:
zend_resolve_goto_label(op_array, opline);
if (op_array->fn_flags & ZEND_ACC_HAS_FINALLY_BLOCK) {
zend_check_finally_breakout(op_array, opline - op_array->opcodes, opline->op1.opline_num);
}
ZEND_FALLTHROUGH;
case ZEND_JMP:
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);
ZEND_FALLTHROUGH;
case ZEND_JMPZ:
case ZEND_JMPNZ:
case ZEND_JMPZ_EX:
case ZEND_JMPNZ_EX:
case ZEND_JMP_SET:
case ZEND_COALESCE:
case ZEND_FE_RESET_R:
case ZEND_FE_RESET_RW:
case ZEND_JMP_NULL:
ZEND_PASS_TWO_UPDATE_JMP_TARGET(op_array, opline, opline->op2);
break;
case ZEND_ASSERT_CHECK:
{
/* If result of assert is unused, result of check is unused as well */
zend_op *call = &op_array->opcodes[opline->op2.opline_num - 1];
if (call->opcode == ZEND_EXT_FCALL_END) {
call--;
}
if (call->result_type == IS_UNUSED) {
opline->result_type = IS_UNUSED;
}
ZEND_PASS_TWO_UPDATE_JMP_TARGET(op_array, opline, opline->op2);
break;
}
case ZEND_FE_FETCH_R:
case ZEND_FE_FETCH_RW:
/* absolute index to relative offset */
opline->extended_value = ZEND_OPLINE_NUM_TO_OFFSET(op_array, opline, opline->extended_value);
break;
case ZEND_CATCH:
if (!(opline->extended_value & ZEND_LAST_CATCH)) {
ZEND_PASS_TWO_UPDATE_JMP_TARGET(op_array, opline, opline->op2);
}
break;
case ZEND_RETURN:
case ZEND_RETURN_BY_REF:
if (op_array->fn_flags & ZEND_ACC_GENERATOR) {
opline->opcode = ZEND_GENERATOR_RETURN;
}
break;
case ZEND_SWITCH_LONG:
case ZEND_SWITCH_STRING:
case ZEND_MATCH:
{
/* absolute indexes to relative offsets */
HashTable *jumptable = Z_ARRVAL_P(CT_CONSTANT(opline->op2));
zval *zv;
ZEND_HASH_FOREACH_VAL(jumptable, zv) {
Z_LVAL_P(zv) = ZEND_OPLINE_NUM_TO_OFFSET(op_array, opline, Z_LVAL_P(zv));
} ZEND_HASH_FOREACH_END();
opline->extended_value = ZEND_OPLINE_NUM_TO_OFFSET(op_array, opline, opline->extended_value);
break;
}
}
if (opline->op1_type == IS_CONST) {
ZEND_PASS_TWO_UPDATE_CONSTANT(op_array, opline, opline->op1);
} else if (opline->op1_type & (IS_VAR|IS_TMP_VAR)) {
opline->op1.var = EX_NUM_TO_VAR(op_array->last_var + opline->op1.var);
}
if (opline->op2_type == IS_CONST) {
ZEND_PASS_TWO_UPDATE_CONSTANT(op_array, opline, opline->op2);
} else if (opline->op2_type & (IS_VAR|IS_TMP_VAR)) {
opline->op2.var = EX_NUM_TO_VAR(op_array->last_var + opline->op2.var);
}
if (opline->result_type & (IS_VAR|IS_TMP_VAR)) {
opline->result.var = EX_NUM_TO_VAR(op_array->last_var + opline->result.var);
}
ZEND_VM_SET_OPCODE_HANDLER(opline);
opline++;
}
zend_calc_live_ranges(op_array, NULL);
return;
}
ZEND_API unary_op_type get_unary_op(int opcode)
{
switch (opcode) {
case ZEND_BW_NOT:
return (unary_op_type) bitwise_not_function;
case ZEND_BOOL_NOT:
return (unary_op_type) boolean_not_function;
default:
return (unary_op_type) NULL;
}
}
ZEND_API binary_op_type get_binary_op(int opcode)
{
switch (opcode) {
case ZEND_ADD:
return (binary_op_type) add_function;
case ZEND_SUB:
return (binary_op_type) sub_function;
case ZEND_MUL:
return (binary_op_type) mul_function;
case ZEND_POW:
return (binary_op_type) pow_function;
case ZEND_DIV:
return (binary_op_type) div_function;
case ZEND_MOD:
return (binary_op_type) mod_function;
case ZEND_SL:
return (binary_op_type) shift_left_function;
case ZEND_SR:
return (binary_op_type) shift_right_function;
case ZEND_FAST_CONCAT:
case ZEND_CONCAT:
return (binary_op_type) concat_function;
case ZEND_IS_IDENTICAL:
case ZEND_CASE_STRICT:
return (binary_op_type) is_identical_function;
case ZEND_IS_NOT_IDENTICAL:
return (binary_op_type) is_not_identical_function;
case ZEND_IS_EQUAL:
case ZEND_CASE:
return (binary_op_type) is_equal_function;
case ZEND_IS_NOT_EQUAL:
return (binary_op_type) is_not_equal_function;
case ZEND_IS_SMALLER:
return (binary_op_type) is_smaller_function;
case ZEND_IS_SMALLER_OR_EQUAL:
return (binary_op_type) is_smaller_or_equal_function;
case ZEND_SPACESHIP:
return (binary_op_type) compare_function;
case ZEND_BW_OR:
return (binary_op_type) bitwise_or_function;
case ZEND_BW_AND:
return (binary_op_type) bitwise_and_function;
case ZEND_BW_XOR:
return (binary_op_type) bitwise_xor_function;
case ZEND_BOOL_XOR:
return (binary_op_type) boolean_xor_function;
default:
ZEND_UNREACHABLE();
return (binary_op_type) NULL;
}
}
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