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optimize_func_calls.c
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/*
+----------------------------------------------------------------------+
| Zend OPcache |
+----------------------------------------------------------------------+
| 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 |
| [email protected] so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
| Authors: Dmitry Stogov <[email protected]> |
| Xinchen Hui <[email protected]> |
+----------------------------------------------------------------------+
*/
/* pass 4
* - optimize INIT_FCALL_BY_NAME to DO_FCALL
*/
#include "Optimizer/zend_optimizer.h"
#include "Optimizer/zend_optimizer_internal.h"
#include "zend_API.h"
#include "zend_constants.h"
#include "zend_execute.h"
#include "zend_vm.h"
typedef struct _optimizer_call_info {
zend_function *func;
zend_op *opline;
zend_op *last_check_func_arg_opline;
bool is_prototype;
bool try_inline;
uint32_t func_arg_num;
} optimizer_call_info;
static void zend_delete_call_instructions(zend_op_array *op_array, zend_op *opline)
{
int call = 0;
while (1) {
switch (opline->opcode) {
case ZEND_INIT_FCALL_BY_NAME:
case ZEND_INIT_NS_FCALL_BY_NAME:
case ZEND_INIT_STATIC_METHOD_CALL:
case ZEND_INIT_METHOD_CALL:
case ZEND_INIT_FCALL:
if (call == 0) {
MAKE_NOP(opline);
return;
}
ZEND_FALLTHROUGH;
case ZEND_NEW:
case ZEND_INIT_DYNAMIC_CALL:
case ZEND_INIT_USER_CALL:
call--;
break;
case ZEND_DO_FCALL:
case ZEND_DO_ICALL:
case ZEND_DO_UCALL:
case ZEND_DO_FCALL_BY_NAME:
call++;
break;
case ZEND_SEND_VAL:
case ZEND_SEND_VAR:
if (call == 0) {
zend_optimizer_convert_to_free_op1(op_array, opline);
}
break;
}
opline--;
}
}
static void zend_try_inline_call(zend_op_array *op_array, zend_op *fcall, zend_op *opline, zend_function *func)
{
if (func->type == ZEND_USER_FUNCTION
&& !(func->op_array.fn_flags & (ZEND_ACC_ABSTRACT|ZEND_ACC_HAS_TYPE_HINTS))
/* TODO: function copied from trait may be inconsistent ??? */
&& !(func->op_array.fn_flags & (ZEND_ACC_TRAIT_CLONE))
&& fcall->extended_value >= func->op_array.required_num_args
&& func->op_array.opcodes[func->op_array.num_args].opcode == ZEND_RETURN) {
zend_op *ret_opline = func->op_array.opcodes + func->op_array.num_args;
if (ret_opline->op1_type == IS_CONST) {
uint32_t i, num_args = func->op_array.num_args;
num_args += (func->op_array.fn_flags & ZEND_ACC_VARIADIC) != 0;
if (fcall->opcode == ZEND_INIT_STATIC_METHOD_CALL
&& !(func->op_array.fn_flags & ZEND_ACC_STATIC)) {
/* Don't inline static call to instance method. */
return;
}
for (i = 0; i < num_args; i++) {
/* Don't inline functions with by-reference arguments. This would require
* correct handling of INDIRECT arguments. */
if (ZEND_ARG_SEND_MODE(&func->op_array.arg_info[i])) {
return;
}
}
if (fcall->extended_value < func->op_array.num_args) {
/* don't inline functions with named constants in default arguments */
i = fcall->extended_value;
do {
if (Z_TYPE_P(CRT_CONSTANT_EX(&func->op_array, &func->op_array.opcodes[i], func->op_array.opcodes[i].op2)) == IS_CONSTANT_AST) {
return;
}
i++;
} while (i < func->op_array.num_args);
}
if (RETURN_VALUE_USED(opline)) {
zval zv;
ZVAL_COPY(&zv, CRT_CONSTANT_EX(&func->op_array, ret_opline, ret_opline->op1));
opline->opcode = ZEND_QM_ASSIGN;
opline->op1_type = IS_CONST;
opline->op1.constant = zend_optimizer_add_literal(op_array, &zv);
SET_UNUSED(opline->op2);
} else {
MAKE_NOP(opline);
}
zend_delete_call_instructions(op_array, opline-1);
}
}
}
/* arg_num is 1-based here, to match SEND encoding. */
static bool has_known_send_mode(const optimizer_call_info *info, uint32_t arg_num)
{
if (!info->func) {
return false;
}
/* For prototype functions we should not make assumptions about arguments that are not part of
* the signature: And inheriting method can add an optional by-ref argument. */
return !info->is_prototype
|| arg_num <= info->func->common.num_args
|| (info->func->common.fn_flags & ZEND_ACC_VARIADIC);
}
void zend_optimize_func_calls(zend_op_array *op_array, zend_optimizer_ctx *ctx)
{
zend_op *opline = op_array->opcodes;
zend_op *end = opline + op_array->last;
int call = 0;
void *checkpoint;
optimizer_call_info *call_stack;
if (op_array->last < 2) {
return;
}
checkpoint = zend_arena_checkpoint(ctx->arena);
call_stack = zend_arena_calloc(&ctx->arena, op_array->last / 2, sizeof(optimizer_call_info));
while (opline < end) {
switch (opline->opcode) {
case ZEND_INIT_FCALL_BY_NAME:
case ZEND_INIT_NS_FCALL_BY_NAME:
case ZEND_INIT_STATIC_METHOD_CALL:
case ZEND_INIT_METHOD_CALL:
case ZEND_INIT_FCALL:
case ZEND_NEW:
/* The argument passing optimizations are valid for prototypes as well,
* as inheritance cannot change between ref <-> non-ref arguments. */
call_stack[call].func = zend_optimizer_get_called_func(
ctx->script, op_array, opline, &call_stack[call].is_prototype);
call_stack[call].try_inline =
!call_stack[call].is_prototype && opline->opcode != ZEND_NEW;
ZEND_FALLTHROUGH;
case ZEND_INIT_DYNAMIC_CALL:
case ZEND_INIT_USER_CALL:
call_stack[call].opline = opline;
call_stack[call].func_arg_num = (uint32_t)-1;
call++;
break;
case ZEND_DO_FCALL:
case ZEND_DO_ICALL:
case ZEND_DO_UCALL:
case ZEND_DO_FCALL_BY_NAME:
case ZEND_CALLABLE_CONVERT:
call--;
if (call_stack[call].func && call_stack[call].opline) {
zend_op *fcall = call_stack[call].opline;
if (fcall->opcode == ZEND_INIT_FCALL) {
/* nothing to do */
} else if (fcall->opcode == ZEND_INIT_FCALL_BY_NAME) {
fcall->opcode = ZEND_INIT_FCALL;
fcall->op1.num = zend_vm_calc_used_stack(fcall->extended_value, call_stack[call].func);
literal_dtor(&ZEND_OP2_LITERAL(fcall));
fcall->op2.constant = fcall->op2.constant + 1;
if (opline->opcode != ZEND_CALLABLE_CONVERT) {
opline->opcode = zend_get_call_op(fcall, call_stack[call].func);
}
} else if (fcall->opcode == ZEND_INIT_NS_FCALL_BY_NAME) {
fcall->opcode = ZEND_INIT_FCALL;
fcall->op1.num = zend_vm_calc_used_stack(fcall->extended_value, call_stack[call].func);
literal_dtor(&op_array->literals[fcall->op2.constant]);
literal_dtor(&op_array->literals[fcall->op2.constant + 2]);
fcall->op2.constant = fcall->op2.constant + 1;
if (opline->opcode != ZEND_CALLABLE_CONVERT) {
opline->opcode = zend_get_call_op(fcall, call_stack[call].func);
}
} else if (fcall->opcode == ZEND_INIT_STATIC_METHOD_CALL
|| fcall->opcode == ZEND_INIT_METHOD_CALL
|| fcall->opcode == ZEND_NEW) {
/* We don't have specialized opcodes for this, do nothing */
} else {
ZEND_UNREACHABLE();
}
if ((ZEND_OPTIMIZER_PASS_16 & ctx->optimization_level)
&& call_stack[call].try_inline
&& opline->opcode != ZEND_CALLABLE_CONVERT) {
zend_try_inline_call(op_array, fcall, opline, call_stack[call].func);
}
}
call_stack[call].func = NULL;
call_stack[call].opline = NULL;
call_stack[call].try_inline = 0;
call_stack[call].func_arg_num = (uint32_t)-1;
break;
case ZEND_FETCH_FUNC_ARG:
case ZEND_FETCH_STATIC_PROP_FUNC_ARG:
case ZEND_FETCH_OBJ_FUNC_ARG:
case ZEND_FETCH_DIM_FUNC_ARG:
if (call_stack[call - 1].func_arg_num != (uint32_t)-1
&& has_known_send_mode(&call_stack[call - 1], call_stack[call - 1].func_arg_num)) {
if (ARG_SHOULD_BE_SENT_BY_REF(call_stack[call - 1].func, call_stack[call - 1].func_arg_num)) {
/* There's no TMP specialization for FETCH_OBJ_W/FETCH_DIM_W. Avoid
* converting it and error at runtime in the FUNC_ARG variant. */
if ((opline->opcode == ZEND_FETCH_OBJ_FUNC_ARG || opline->opcode == ZEND_FETCH_DIM_FUNC_ARG)
&& (opline->op1_type == IS_TMP_VAR || call_stack[call - 1].last_check_func_arg_opline == NULL)) {
/* Don't remove the associated CHECK_FUNC_ARG opcode. */
call_stack[call - 1].last_check_func_arg_opline = NULL;
break;
}
if (opline->opcode != ZEND_FETCH_STATIC_PROP_FUNC_ARG) {
opline->opcode -= 9;
} else {
opline->opcode = ZEND_FETCH_STATIC_PROP_W;
}
} else {
if (opline->opcode == ZEND_FETCH_DIM_FUNC_ARG
&& opline->op2_type == IS_UNUSED) {
/* FETCH_DIM_FUNC_ARG supports UNUSED op2, while FETCH_DIM_R does not.
* Performing the replacement would create an invalid opcode. */
call_stack[call - 1].try_inline = 0;
break;
}
if (opline->opcode != ZEND_FETCH_STATIC_PROP_FUNC_ARG) {
opline->opcode -= 12;
} else {
opline->opcode = ZEND_FETCH_STATIC_PROP_R;
}
}
}
break;
case ZEND_SEND_VAL_EX:
if (opline->op2_type == IS_CONST) {
call_stack[call - 1].try_inline = 0;
break;
}
if (has_known_send_mode(&call_stack[call - 1], opline->op2.num)) {
if (!ARG_MUST_BE_SENT_BY_REF(call_stack[call - 1].func, opline->op2.num)) {
opline->opcode = ZEND_SEND_VAL;
}
}
break;
case ZEND_CHECK_FUNC_ARG:
if (opline->op2_type == IS_CONST) {
call_stack[call - 1].try_inline = 0;
call_stack[call - 1].func_arg_num = (uint32_t)-1;
break;
}
if (has_known_send_mode(&call_stack[call - 1], opline->op2.num)) {
call_stack[call - 1].func_arg_num = opline->op2.num;
call_stack[call - 1].last_check_func_arg_opline = opline;
}
break;
case ZEND_SEND_FUNC_ARG:
/* Don't transform SEND_FUNC_ARG if any FETCH opcodes weren't transformed. */
if (call_stack[call - 1].last_check_func_arg_opline == NULL) {
if (opline->op2_type == IS_CONST) {
call_stack[call - 1].try_inline = 0;
}
break;
}
MAKE_NOP(call_stack[call - 1].last_check_func_arg_opline);
call_stack[call - 1].last_check_func_arg_opline = NULL;
ZEND_FALLTHROUGH;
case ZEND_SEND_VAR_EX:
if (opline->op2_type == IS_CONST) {
call_stack[call - 1].try_inline = 0;
break;
}
if (has_known_send_mode(&call_stack[call - 1], opline->op2.num)) {
call_stack[call - 1].func_arg_num = (uint32_t)-1;
if (ARG_SHOULD_BE_SENT_BY_REF(call_stack[call - 1].func, opline->op2.num)) {
opline->opcode = ZEND_SEND_REF;
} else {
opline->opcode = ZEND_SEND_VAR;
}
}
break;
case ZEND_SEND_VAR_NO_REF_EX:
if (opline->op2_type == IS_CONST) {
call_stack[call - 1].try_inline = 0;
break;
}
if (has_known_send_mode(&call_stack[call - 1], opline->op2.num)) {
if (ARG_MUST_BE_SENT_BY_REF(call_stack[call - 1].func, opline->op2.num)) {
opline->opcode = ZEND_SEND_VAR_NO_REF;
} else if (ARG_MAY_BE_SENT_BY_REF(call_stack[call - 1].func, opline->op2.num)) {
opline->opcode = ZEND_SEND_VAL;
} else {
opline->opcode = ZEND_SEND_VAR;
}
}
break;
case ZEND_SEND_VAL:
case ZEND_SEND_VAR:
case ZEND_SEND_REF:
if (opline->op2_type == IS_CONST) {
call_stack[call - 1].try_inline = 0;
break;
}
break;
case ZEND_SEND_UNPACK:
case ZEND_SEND_USER:
case ZEND_SEND_ARRAY:
call_stack[call - 1].try_inline = 0;
break;
default:
break;
}
opline++;
}
zend_arena_release(&ctx->arena, checkpoint);
}