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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 |
| [email protected] so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
| Authors: Andi Gutmans <[email protected]> |
| Zeev Suraski <[email protected]> |
| Dmitry Stogov <[email protected]> |
+----------------------------------------------------------------------+
*/
#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_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, &op_array->static_variables);
op_array->last_try_catch = 0;
op_array->fn_flags = 0;
op_array->last_literal = 0;
op_array->literals = 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, zend_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 (CE_STATIC_MEMBERS(ce)) {
zval *static_members = CE_STATIC_MEMBERS(ce);
zval *p = static_members;
zval *end = p + ce->default_static_members_count;
if (UNEXPECTED(ZEND_MAP_PTR(ce->static_members_table) == &ce->default_static_members_table)) {
/* Special case: If this is a static property on a dl'ed internal class, then the
* static property table and the default property table are the same. In this case we
* destroy the values here, but leave behind valid UNDEF zvals and don't free the
* table itself. */
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);
ZVAL_UNDEF(p);
p++;
}
} else {
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 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|ZEND_ACC_PRELOADED)) {
zend_op_array *op_array;
if (ce->default_static_members_count) {
zend_cleanup_internal_class_data(ce);
}
if (ce->ce_flags & ZEND_HAS_STATIC_IN_METHODS) {
ZEND_HASH_FOREACH_PTR(&ce->function_table, op_array) {
if (op_array->type == ZEND_USER_FUNCTION) {
destroy_op_array(op_array);
}
} ZEND_HASH_FOREACH_END();
}
return;
} else if (--ce->refcount > 0) {
return;
}
switch (ce->type) {
case ZEND_USER_CLASS:
if (ce->parent_name && !(ce->ce_flags & ZEND_ACC_RESOLVED_PARENT)) {
zend_string_release_ex(ce->parent_name, 0);
}
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) {
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 - ce->default_static_members_table == 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(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_string_release_ex(ce->name, 0);
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) {
if (!(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->interfaces);
}
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->num_traits > 0) {
_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);
if (ZEND_MAP_PTR(ce->static_members_table) != &ce->default_static_members_table) {
zend_cleanup_internal_class_data(ce);
}
}
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) {
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 destroy_op_array(zend_op_array *op_array)
{
uint32_t i;
if (op_array->static_variables) {
HashTable *ht = ZEND_MAP_PTR_GET(op_array->static_variables_ptr);
if (ht && !(GC_FLAGS(ht) & IS_ARRAY_IMMUTABLE)) {
if (GC_DELREF(ht) == 0) {
zend_array_destroy(ht);
}
}
}
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);
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);
}
}
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_ASSERT(0);
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;
}
}
/* explicit 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 zend_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 zend_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_SWITCH_LONG
|| 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 int pass_two(zend_op_array *op_array)
{
zend_op *opline, *end;
if (!ZEND_USER_CODE(op_array->type)) {
return 0;
}
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);
}
/* break omitted intentionally */
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);
/* break omitted intentionally */