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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: |
| https://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 "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 void 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:
case ZEND_INIT_PARENT_PROPERTY_HOOK_CALL:
call_stack[call] = call_info;
func = zend_optimizer_get_called_func(
script, op_array, opline, &is_prototype);
if (func) {
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;
call_info->is_prototype = is_prototype;
call_info->is_frameless = false;
func_info->callee_info = call_info;
if (build_flags & ZEND_CALL_TREE) {
call_info->next_caller = NULL;
} else if (func->type == ZEND_INTERNAL_FUNCTION
|| func->op_array.filename != script->filename) {
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_FRAMELESS_ICALL_0:
case ZEND_FRAMELESS_ICALL_1:
case ZEND_FRAMELESS_ICALL_2:
case ZEND_FRAMELESS_ICALL_3: {
func = ZEND_FLF_FUNC(opline);
zend_call_info *call_info = zend_arena_calloc(arena, 1, sizeof(zend_call_info));
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 = ZEND_FLF_NUM_ARGS(opline->opcode);
call_info->next_callee = func_info->callee_info;
call_info->is_prototype = false;
call_info->is_frameless = true;
call_info->next_caller = NULL;
func_info->callee_info = call_info;
break;
}
case ZEND_DO_FCALL:
case ZEND_DO_ICALL:
case ZEND_DO_UCALL:
case ZEND_DO_FCALL_BY_NAME:
case ZEND_CALLABLE_CONVERT:
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;
}
opline++;
}
free_alloca(call_stack, use_heap);
}
static bool 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;
bool 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;
for (; call_info; call_info = call_info->next_caller) {
if (call_info->is_prototype) {
/* Might be calling an overridden child method and not actually recursive. */
continue;
}
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;
}
}
}
}
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 void 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);
}
/* }}} */
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;
}
if (!call->is_frameless) {
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;
}
/* }}} */
|
