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archived-php-src/Zend/Optimizer/zend_call_graph.c
Nikita Popov 83be073abe Move optimizer into core 
This only moves the files, adjusts the build system, exports APIs
and does minor fixups to make sure the code builds.

This does not yet try to make the optimizer usable independently
of opcache.

Closes GH-6642.
2021-01-28 10:38:25 +01:00

272 lines
8.4 KiB
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/*
+----------------------------------------------------------------------+
| Zend Engine, Call Graph |
+----------------------------------------------------------------------+
| Copyright (c) The PHP Group |
+----------------------------------------------------------------------+
| This source file is subject to version 3.01 of the PHP 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.php.net/license/3_01.txt |
| If you did not receive a copy of the PHP license and are unable to |
| obtain it through the world-wide-web, please send a note to |
| license@php.net so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
| Authors: Dmitry Stogov <dmitry@php.net> |
+----------------------------------------------------------------------+
*/
#include "php.h"
#include "zend_compile.h"
#include "zend_extensions.h"
#include "Optimizer/zend_optimizer.h"
#include "zend_optimizer_internal.h"
#include "zend_inference.h"
#include "zend_call_graph.h"
#include "zend_func_info.h"
#include "zend_inference.h"
#include "zend_call_graph.h"
static void zend_op_array_calc(zend_op_array *op_array, void *context)
{
zend_call_graph *call_graph = context;
call_graph->op_arrays_count++;
}
static void zend_op_array_collect(zend_op_array *op_array, void *context)
{
zend_call_graph *call_graph = context;
zend_func_info *func_info = call_graph->func_infos + call_graph->op_arrays_count;
ZEND_SET_FUNC_INFO(op_array, func_info);
call_graph->op_arrays[call_graph->op_arrays_count] = op_array;
func_info->num = call_graph->op_arrays_count;
call_graph->op_arrays_count++;
}
ZEND_API int zend_analyze_calls(zend_arena **arena, zend_script *script, uint32_t build_flags, zend_op_array *op_array, zend_func_info *func_info)
{
zend_op *opline = op_array->opcodes;
zend_op *end = opline + op_array->last;
zend_function *func;
zend_call_info *call_info;
int call = 0;
zend_call_info **call_stack;
ALLOCA_FLAG(use_heap);
bool is_prototype;
call_stack = do_alloca((op_array->last / 2) * sizeof(zend_call_info*), use_heap);
call_info = NULL;
while (opline != end) {
switch (opline->opcode) {
case ZEND_INIT_FCALL:
case ZEND_INIT_METHOD_CALL:
case ZEND_INIT_STATIC_METHOD_CALL:
call_stack[call] = call_info;
func = zend_optimizer_get_called_func(
script, op_array, opline, &is_prototype);
/* TODO: Support prototypes? */
if (func && !is_prototype) {
call_info = zend_arena_calloc(arena, 1, sizeof(zend_call_info) + (sizeof(zend_send_arg_info) * ((int)opline->extended_value - 1)));
call_info->caller_op_array = op_array;
call_info->caller_init_opline = opline;
call_info->caller_call_opline = NULL;
call_info->callee_func = func;
call_info->num_args = opline->extended_value;
call_info->next_callee = func_info->callee_info;
func_info->callee_info = call_info;
if (build_flags & ZEND_CALL_TREE) {
call_info->next_caller = NULL;
} else if (func->type == ZEND_INTERNAL_FUNCTION) {
call_info->next_caller = NULL;
} else {
zend_func_info *callee_func_info = ZEND_FUNC_INFO(&func->op_array);
if (callee_func_info) {
call_info->next_caller = callee_func_info->caller_info;
callee_func_info->caller_info = call_info;
} else {
call_info->next_caller = NULL;
}
}
} else {
call_info = NULL;
}
call++;
break;
case ZEND_INIT_FCALL_BY_NAME:
case ZEND_INIT_NS_FCALL_BY_NAME:
case ZEND_INIT_DYNAMIC_CALL:
case ZEND_NEW:
case ZEND_INIT_USER_CALL:
call_stack[call] = call_info;
call_info = NULL;
call++;
break;
case ZEND_DO_FCALL:
case ZEND_DO_ICALL:
case ZEND_DO_UCALL:
case ZEND_DO_FCALL_BY_NAME:
func_info->flags |= ZEND_FUNC_HAS_CALLS;
if (call_info) {
call_info->caller_call_opline = opline;
}
call--;
call_info = call_stack[call];
break;
case ZEND_SEND_VAL:
case ZEND_SEND_VAR:
case ZEND_SEND_VAL_EX:
case ZEND_SEND_VAR_EX:
case ZEND_SEND_FUNC_ARG:
case ZEND_SEND_REF:
case ZEND_SEND_VAR_NO_REF:
case ZEND_SEND_VAR_NO_REF_EX:
case ZEND_SEND_USER:
if (call_info) {
if (opline->op2_type == IS_CONST) {
call_info->named_args = 1;
break;
}
uint32_t num = opline->op2.num;
if (num > 0) {
num--;
}
call_info->arg_info[num].opline = opline;
}
break;
case ZEND_SEND_ARRAY:
case ZEND_SEND_UNPACK:
if (call_info) {
call_info->send_unpack = 1;
}
break;
case ZEND_EXIT:
/* In this case the DO_CALL opcode may have been dropped
* and caller_call_opline will be NULL. */
break;
}
opline++;
}
free_alloca(call_stack, use_heap);
return SUCCESS;
}
static int zend_is_indirectly_recursive(zend_op_array *root, zend_op_array *op_array, zend_bitset visited)
{
zend_func_info *func_info;
zend_call_info *call_info;
int ret = 0;
if (op_array == root) {
return 1;
}
func_info = ZEND_FUNC_INFO(op_array);
if (zend_bitset_in(visited, func_info->num)) {
return 0;
}
zend_bitset_incl(visited, func_info->num);
call_info = func_info->caller_info;
while (call_info) {
if (zend_is_indirectly_recursive(root, call_info->caller_op_array, visited)) {
call_info->recursive = 1;
ret = 1;
}
call_info = call_info->next_caller;
}
return ret;
}
static void zend_analyze_recursion(zend_call_graph *call_graph)
{
zend_op_array *op_array;
zend_func_info *func_info;
zend_call_info *call_info;
int i;
int set_len = zend_bitset_len(call_graph->op_arrays_count);
zend_bitset visited;
ALLOCA_FLAG(use_heap);
visited = ZEND_BITSET_ALLOCA(set_len, use_heap);
for (i = 0; i < call_graph->op_arrays_count; i++) {
op_array = call_graph->op_arrays[i];
func_info = call_graph->func_infos + i;
call_info = func_info->caller_info;
while (call_info) {
if (call_info->caller_op_array == op_array) {
call_info->recursive = 1;
func_info->flags |= ZEND_FUNC_RECURSIVE | ZEND_FUNC_RECURSIVE_DIRECTLY;
} else {
memset(visited, 0, sizeof(zend_ulong) * set_len);
if (zend_is_indirectly_recursive(op_array, call_info->caller_op_array, visited)) {
call_info->recursive = 1;
func_info->flags |= ZEND_FUNC_RECURSIVE | ZEND_FUNC_RECURSIVE_INDIRECTLY;
}
}
call_info = call_info->next_caller;
}
}
free_alloca(visited, use_heap);
}
static void zend_sort_op_arrays(zend_call_graph *call_graph)
{
(void) call_graph;
// TODO: perform topological sort of cyclic call graph
}
ZEND_API int zend_build_call_graph(zend_arena **arena, zend_script *script, zend_call_graph *call_graph) /* {{{ */
{
call_graph->op_arrays_count = 0;
zend_foreach_op_array(script, zend_op_array_calc, call_graph);
call_graph->op_arrays = (zend_op_array**)zend_arena_calloc(arena, call_graph->op_arrays_count, sizeof(zend_op_array*));
call_graph->func_infos = (zend_func_info*)zend_arena_calloc(arena, call_graph->op_arrays_count, sizeof(zend_func_info));
call_graph->op_arrays_count = 0;
zend_foreach_op_array(script, zend_op_array_collect, call_graph);
return SUCCESS;
}
/* }}} */
ZEND_API void zend_analyze_call_graph(zend_arena **arena, zend_script *script, zend_call_graph *call_graph) /* {{{ */
{
int i;
for (i = 0; i < call_graph->op_arrays_count; i++) {
zend_analyze_calls(arena, script, 0, call_graph->op_arrays[i], call_graph->func_infos + i);
}
zend_analyze_recursion(call_graph);
zend_sort_op_arrays(call_graph);
}
/* }}} */
ZEND_API zend_call_info **zend_build_call_map(zend_arena **arena, zend_func_info *info, const zend_op_array *op_array) /* {{{ */
{
zend_call_info **map, *call;
if (!info->callee_info) {
/* Don't build call map if function contains no calls */
return NULL;
}
map = zend_arena_calloc(arena, sizeof(zend_call_info *), op_array->last);
for (call = info->callee_info; call; call = call->next_callee) {
int i;
map[call->caller_init_opline - op_array->opcodes] = call;
if (call->caller_call_opline) {
map[call->caller_call_opline - op_array->opcodes] = call;
}
for (i = 0; i < call->num_args; i++) {
if (call->arg_info[i].opline) {
map[call->arg_info[i].opline - op_array->opcodes] = call;
}
}
}
return map;
}
/* }}} */
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