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zend_jit_vm_helpers.c
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/*
+----------------------------------------------------------------------+
| Zend JIT |
+----------------------------------------------------------------------+
| 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> |
| Xinchen Hui <laruence@php.net> |
+----------------------------------------------------------------------+
*/
#include "Zend/zend_execute.h"
#include "Zend/zend_exceptions.h"
#include "Zend/zend_vm.h"
#include "Zend/zend_closures.h"
#include "Zend/zend_constants.h"
#include "Zend/zend_API.h"
#include <ZendAccelerator.h>
#include "Optimizer/zend_func_info.h"
#include "Optimizer/zend_call_graph.h"
#include "zend_jit.h"
#include "zend_jit_internal.h"
#ifdef HAVE_GCC_GLOBAL_REGS
# pragma GCC diagnostic ignored "-Wvolatile-register-var"
# if defined(__x86_64__)
register zend_execute_data* volatile execute_data __asm__("%r14");
register const zend_op* volatile opline __asm__("%r15");
# elif defined(i386)
register zend_execute_data* volatile execute_data __asm__("%esi");
register const zend_op* volatile opline __asm__("%edi");
# elif defined(__aarch64__)
register zend_execute_data* volatile execute_data __asm__("x27");
register const zend_op* volatile opline __asm__("x28");
# endif
# pragma GCC diagnostic warning "-Wvolatile-register-var"
#endif
ZEND_OPCODE_HANDLER_RET ZEND_FASTCALL zend_jit_leave_nested_func_helper(uint32_t call_info EXECUTE_DATA_DC)
{
zend_execute_data *old_execute_data;
if (UNEXPECTED(call_info & ZEND_CALL_HAS_SYMBOL_TABLE)) {
zend_clean_and_cache_symbol_table(EX(symbol_table));
}
zend_vm_stack_free_extra_args_ex(call_info, execute_data);
if (UNEXPECTED(call_info & ZEND_CALL_RELEASE_THIS)) {
OBJ_RELEASE(Z_OBJ(execute_data->This));
} else if (UNEXPECTED(call_info & ZEND_CALL_CLOSURE)) {
OBJ_RELEASE(ZEND_CLOSURE_OBJECT(EX(func)));
}
if (UNEXPECTED(call_info & ZEND_CALL_HAS_EXTRA_NAMED_PARAMS)) {
zend_free_extra_named_params(EX(extra_named_params));
}
old_execute_data = execute_data;
execute_data = EX(prev_execute_data);
zend_vm_stack_free_call_frame_ex(call_info, old_execute_data);
if (UNEXPECTED(EG(exception) != NULL)) {
const zend_op *old_opline = EX(opline);
zend_throw_exception_internal(NULL);
if (old_opline->result_type != IS_UNDEF) {
zval_ptr_dtor(EX_VAR(old_opline->result.var));
}
#ifndef HAVE_GCC_GLOBAL_REGS
return 2; // ZEND_VM_LEAVE
#endif
} else {
EX(opline)++;
#ifdef HAVE_GCC_GLOBAL_REGS
opline = EX(opline);
#else
return 2; // ZEND_VM_LEAVE
#endif
}
}
ZEND_OPCODE_HANDLER_RET ZEND_FASTCALL zend_jit_leave_top_func_helper(uint32_t call_info EXECUTE_DATA_DC)
{
if (UNEXPECTED(call_info & (ZEND_CALL_HAS_SYMBOL_TABLE|ZEND_CALL_FREE_EXTRA_ARGS))) {
if (UNEXPECTED(call_info & ZEND_CALL_HAS_SYMBOL_TABLE)) {
zend_clean_and_cache_symbol_table(EX(symbol_table));
}
zend_vm_stack_free_extra_args_ex(call_info, execute_data);
}
if (UNEXPECTED(call_info & ZEND_CALL_HAS_EXTRA_NAMED_PARAMS)) {
zend_free_extra_named_params(EX(extra_named_params));
}
if (UNEXPECTED(call_info & ZEND_CALL_CLOSURE)) {
OBJ_RELEASE(ZEND_CLOSURE_OBJECT(EX(func)));
}
execute_data = EG(current_execute_data);
#ifdef HAVE_GCC_GLOBAL_REGS
opline = zend_jit_halt_op;
#else
return -1; // ZEND_VM_RETURN
#endif
}
ZEND_OPCODE_HANDLER_RET ZEND_FASTCALL zend_jit_leave_func_helper(EXECUTE_DATA_D)
{
uint32_t call_info = EX_CALL_INFO();
if (call_info & ZEND_CALL_TOP) {
ZEND_OPCODE_TAIL_CALL_EX(zend_jit_leave_top_func_helper, call_info);
} else {
ZEND_OPCODE_TAIL_CALL_EX(zend_jit_leave_nested_func_helper, call_info);
}
}
static void ZEND_FASTCALL zend_jit_copy_extra_args_helper_ex(bool skip_recv EXECUTE_DATA_DC)
{
zend_op_array *op_array = &EX(func)->op_array;
if (EXPECTED(!(op_array->fn_flags & ZEND_ACC_CALL_VIA_TRAMPOLINE))) {
uint32_t first_extra_arg = op_array->num_args;
uint32_t num_args = EX_NUM_ARGS();
zval *end, *src, *dst;
uint32_t type_flags = 0;
if (skip_recv && EXPECTED((op_array->fn_flags & ZEND_ACC_HAS_TYPE_HINTS) == 0)) {
/* Skip useless ZEND_RECV and ZEND_RECV_INIT opcodes */
#ifdef HAVE_GCC_GLOBAL_REGS
opline += first_extra_arg;
#else
EX(opline) += first_extra_arg;
#endif
}
/* move extra args into separate array after all CV and TMP vars */
end = EX_VAR_NUM(first_extra_arg - 1);
src = end + (num_args - first_extra_arg);
dst = src + (op_array->last_var + op_array->T - first_extra_arg);
if (EXPECTED(src != dst)) {
do {
type_flags |= Z_TYPE_INFO_P(src);
ZVAL_COPY_VALUE(dst, src);
ZVAL_UNDEF(src);
src--;
dst--;
} while (src != end);
if (type_flags & (IS_TYPE_REFCOUNTED << Z_TYPE_FLAGS_SHIFT)) {
ZEND_ADD_CALL_FLAG(execute_data, ZEND_CALL_FREE_EXTRA_ARGS);
}
} else {
do {
if (Z_REFCOUNTED_P(src)) {
ZEND_ADD_CALL_FLAG(execute_data, ZEND_CALL_FREE_EXTRA_ARGS);
break;
}
src--;
} while (src != end);
}
}
}
void ZEND_FASTCALL zend_jit_copy_extra_args_helper(EXECUTE_DATA_D)
{
zend_jit_copy_extra_args_helper_ex(true EXECUTE_DATA_CC);
}
void ZEND_FASTCALL zend_jit_copy_extra_args_helper_no_skip_recv(EXECUTE_DATA_D)
{
zend_jit_copy_extra_args_helper_ex(false EXECUTE_DATA_CC);
}
bool ZEND_FASTCALL zend_jit_deprecated_helper(OPLINE_D)
{
zend_execute_data *call = (zend_execute_data *) opline;
zend_function *fbc = call->func;
zend_deprecated_function(fbc);
if (EG(exception)) {
#ifndef HAVE_GCC_GLOBAL_REGS
zend_execute_data *execute_data = EG(current_execute_data);
#endif
const zend_op *opline = EG(opline_before_exception);
if (opline && RETURN_VALUE_USED(opline)) {
ZVAL_UNDEF(EX_VAR(opline->result.var));
}
zend_vm_stack_free_args(call);
if (UNEXPECTED(ZEND_CALL_INFO(call) & ZEND_CALL_RELEASE_THIS)) {
OBJ_RELEASE(Z_OBJ(call->This));
}
zend_vm_stack_free_call_frame(call);
return 0;
}
return 1;
}
bool ZEND_FASTCALL zend_jit_nodiscard_helper(OPLINE_D)
{
zend_execute_data *call = (zend_execute_data *) opline;
zend_function *fbc = call->func;
zend_nodiscard_function(fbc);
if (EG(exception)) {
#ifndef HAVE_GCC_GLOBAL_REGS
zend_execute_data *execute_data = EG(current_execute_data);
#endif
const zend_op *opline = EG(opline_before_exception);
if (opline && RETURN_VALUE_USED(opline)) {
ZVAL_UNDEF(EX_VAR(opline->result.var));
}
zend_vm_stack_free_args(call);
if (UNEXPECTED(ZEND_CALL_INFO(call) & ZEND_CALL_RELEASE_THIS)) {
OBJ_RELEASE(Z_OBJ(call->This));
}
zend_vm_stack_free_call_frame(call);
return 0;
}
return 1;
}
bool ZEND_FASTCALL zend_jit_deprecated_nodiscard_helper(OPLINE_D)
{
zend_execute_data *call = (zend_execute_data *) opline;
zend_function *fbc = call->func;
if (fbc->common.fn_flags & ZEND_ACC_DEPRECATED) {
if (zend_jit_deprecated_helper(OPLINE_C) == 0) {
return 0;
}
}
if (fbc->common.fn_flags & ZEND_ACC_NODISCARD) {
if (zend_jit_nodiscard_helper(OPLINE_C) == 0) {
return 0;
}
}
return 1;
}
void ZEND_FASTCALL zend_jit_undefined_long_key(EXECUTE_DATA_D)
{
const zend_op *opline = EX(opline);
zval *result = EX_VAR(opline->result.var);
zval *dim;
if (opline->op2_type == IS_CONST) {
dim = RT_CONSTANT(opline, opline->op2);
} else {
dim = EX_VAR(opline->op2.var);
}
ZEND_ASSERT(Z_TYPE_P(dim) == IS_LONG);
zend_error(E_WARNING, "Undefined array key " ZEND_LONG_FMT, Z_LVAL_P(dim));
ZVAL_NULL(result);
}
void ZEND_FASTCALL zend_jit_undefined_long_key_ex(zend_long key EXECUTE_DATA_DC)
{
const zend_op *opline = EX(opline);
zval *result = EX_VAR(opline->result.var);
zend_error(E_WARNING, "Undefined array key " ZEND_LONG_FMT, key);
ZVAL_NULL(result);
}
void ZEND_FASTCALL zend_jit_undefined_string_key(EXECUTE_DATA_D)
{
const zend_op *opline = EX(opline);
zval *result = EX_VAR(opline->result.var);
zval *dim;
zend_ulong lval;
if (opline->op2_type == IS_CONST) {
dim = RT_CONSTANT(opline, opline->op2);
} else {
dim = EX_VAR(opline->op2.var);
}
ZEND_ASSERT(Z_TYPE_P(dim) == IS_STRING);
if (ZEND_HANDLE_NUMERIC(Z_STR_P(dim), lval)) {
zend_error(E_WARNING, "Undefined array key " ZEND_LONG_FMT, lval);
} else {
zend_error(E_WARNING, "Undefined array key \"%s\"", Z_STRVAL_P(dim));
}
ZVAL_NULL(result);
}
ZEND_OPCODE_HANDLER_RET ZEND_FASTCALL zend_jit_profile_helper(ZEND_OPCODE_HANDLER_ARGS)
{
zend_op_array *op_array = (zend_op_array*)EX(func);
zend_jit_op_array_extension *jit_extension = (zend_jit_op_array_extension*)ZEND_FUNC_INFO(op_array);
zend_vm_opcode_handler_t handler = (zend_vm_opcode_handler_t) jit_extension->orig_handler;
++*(uintptr_t*)(EX(run_time_cache) + zend_jit_profile_counter_rid);
++zend_jit_profile_counter;
ZEND_OPCODE_TAIL_CALL(handler);
}
ZEND_OPCODE_HANDLER_RET ZEND_FASTCALL zend_jit_func_counter_helper(ZEND_OPCODE_HANDLER_ARGS)
{
zend_jit_op_array_hot_extension *jit_extension =
(zend_jit_op_array_hot_extension*)ZEND_FUNC_INFO(&EX(func)->op_array);
#ifndef HAVE_GCC_GLOBAL_REGS
const zend_op *opline = EX(opline);
#endif
*(jit_extension->counter) -= ((ZEND_JIT_COUNTER_INIT + JIT_G(hot_func) - 1) / JIT_G(hot_func));
if (UNEXPECTED(*(jit_extension->counter) <= 0)) {
*(jit_extension->counter) = ZEND_JIT_COUNTER_INIT;
zend_jit_hot_func(execute_data, opline);
ZEND_OPCODE_RETURN();
} else {
zend_vm_opcode_handler_t handler = (zend_vm_opcode_handler_t)jit_extension->orig_handlers[opline - EX(func)->op_array.opcodes];
ZEND_OPCODE_TAIL_CALL(handler);
}
}
ZEND_OPCODE_HANDLER_RET ZEND_FASTCALL zend_jit_loop_counter_helper(ZEND_OPCODE_HANDLER_ARGS)
{
zend_jit_op_array_hot_extension *jit_extension =
(zend_jit_op_array_hot_extension*)ZEND_FUNC_INFO(&EX(func)->op_array);
#ifndef HAVE_GCC_GLOBAL_REGS
const zend_op *opline = EX(opline);
#endif
*(jit_extension->counter) -= ((ZEND_JIT_COUNTER_INIT + JIT_G(hot_loop) - 1) / JIT_G(hot_loop));
if (UNEXPECTED(*(jit_extension->counter) <= 0)) {
*(jit_extension->counter) = ZEND_JIT_COUNTER_INIT;
zend_jit_hot_func(execute_data, opline);
ZEND_OPCODE_RETURN();
} else {
zend_vm_opcode_handler_t handler = (zend_vm_opcode_handler_t)jit_extension->orig_handlers[opline - EX(func)->op_array.opcodes];
ZEND_OPCODE_TAIL_CALL(handler);
}
}
static zend_always_inline zend_constant* _zend_quick_get_constant(
const zval *key, uint32_t flags, int check_defined_only)
{
#ifndef HAVE_GCC_GLOBAL_REGS
zend_execute_data *execute_data = EG(current_execute_data);
#endif
const zend_op *opline = EX(opline);
zval *zv;
zend_constant *c = NULL;
/* null/true/false are resolved during compilation, so don't check for them here. */
zv = zend_hash_find_known_hash(EG(zend_constants), Z_STR_P(key));
if (zv) {
c = (zend_constant*)Z_PTR_P(zv);
} else if (flags & IS_CONSTANT_UNQUALIFIED_IN_NAMESPACE) {
key++;
zv = zend_hash_find_known_hash(EG(zend_constants), Z_STR_P(key));
if (zv) {
c = (zend_constant*)Z_PTR_P(zv);
}
}
if (!c) {
if (!check_defined_only) {
zend_throw_error(NULL, "Undefined constant \"%s\"", Z_STRVAL_P(RT_CONSTANT(opline, opline->op2)));
ZVAL_UNDEF(EX_VAR(opline->result.var));
}
CACHE_PTR(opline->extended_value, ENCODE_SPECIAL_CACHE_NUM(zend_hash_num_elements(EG(zend_constants))));
return NULL;
}
if (!check_defined_only) {
if (ZEND_CONSTANT_FLAGS(c) & CONST_DEPRECATED) {
zend_error(E_DEPRECATED, "Constant %s is deprecated", ZSTR_VAL(c->name));
if (EG(exception)) {
return NULL;
}
return c;
}
}
CACHE_PTR(opline->extended_value, c);
return c;
}
zend_constant* ZEND_FASTCALL zend_jit_get_constant(const zval *key, uint32_t flags)
{
return _zend_quick_get_constant(key, flags, 0);
}
zend_constant* ZEND_FASTCALL zend_jit_check_constant(const zval *key)
{
return _zend_quick_get_constant(key, 0, 1);
}
static zend_always_inline ZEND_OPCODE_HANDLER_RET ZEND_FASTCALL zend_jit_trace_counter_helper(uint32_t cost ZEND_OPCODE_HANDLER_ARGS_DC)
{
zend_jit_op_array_trace_extension *jit_extension =
(zend_jit_op_array_trace_extension*)ZEND_FUNC_INFO(&EX(func)->op_array);
size_t offset = jit_extension->offset;
#ifndef HAVE_GCC_GLOBAL_REGS
const zend_op *opline = EX(opline);
#endif
*(ZEND_OP_TRACE_INFO(opline, offset)->counter) -= cost;
if (UNEXPECTED(*(ZEND_OP_TRACE_INFO(opline, offset)->counter) <= 0)) {
*(ZEND_OP_TRACE_INFO(opline, offset)->counter) = ZEND_JIT_COUNTER_INIT;
if (UNEXPECTED(zend_jit_trace_hot_root(execute_data, opline) < 0)) {
#ifdef HAVE_GCC_GLOBAL_REGS
opline = NULL;
return;
#else
return -1;
#endif
}
#ifdef HAVE_GCC_GLOBAL_REGS
execute_data = EG(current_execute_data);
opline = execute_data ? EX(opline) : NULL;
return;
#else
return 1;
#endif
} else {
zend_vm_opcode_handler_t handler = (zend_vm_opcode_handler_t)ZEND_OP_TRACE_INFO(opline, offset)->orig_handler;
ZEND_OPCODE_TAIL_CALL(handler);
}
}
ZEND_OPCODE_HANDLER_RET ZEND_FASTCALL zend_jit_func_trace_helper(ZEND_OPCODE_HANDLER_ARGS)
{
ZEND_OPCODE_TAIL_CALL_EX(zend_jit_trace_counter_helper,
((ZEND_JIT_COUNTER_INIT + JIT_G(hot_func) - 1) / JIT_G(hot_func)));
}
ZEND_OPCODE_HANDLER_RET ZEND_FASTCALL zend_jit_ret_trace_helper(ZEND_OPCODE_HANDLER_ARGS)
{
ZEND_OPCODE_TAIL_CALL_EX(zend_jit_trace_counter_helper,
((ZEND_JIT_COUNTER_INIT + JIT_G(hot_return) - 1) / JIT_G(hot_return)));
}
ZEND_OPCODE_HANDLER_RET ZEND_FASTCALL zend_jit_loop_trace_helper(ZEND_OPCODE_HANDLER_ARGS)
{
ZEND_OPCODE_TAIL_CALL_EX(zend_jit_trace_counter_helper,
((ZEND_JIT_COUNTER_INIT + JIT_G(hot_loop) - 1) / JIT_G(hot_loop)));
}
#define TRACE_RECORD(_op, _info, _ptr) \
trace_buffer[idx].info = _op | (_info); \
trace_buffer[idx].ptr = _ptr; \
idx++; \
if (idx >= JIT_G(max_trace_length) - 2) { \
stop = ZEND_JIT_TRACE_STOP_TOO_LONG; \
break; \
}
#define TRACE_RECORD_VM(_op, _ptr, _op1_type, _op2_type, _op3_type) \
trace_buffer[idx].op = _op; \
trace_buffer[idx].op1_type = _op1_type; \
trace_buffer[idx].op2_type = _op2_type; \
trace_buffer[idx].op3_type = _op3_type; \
trace_buffer[idx].ptr = _ptr; \
idx++; \
if (idx >= JIT_G(max_trace_length) - 2) { \
stop = ZEND_JIT_TRACE_STOP_TOO_LONG; \
break; \
}
#define TRACE_START(_op, _start, _ptr1, _ptr2) \
trace_buffer[0].op = _op; \
trace_buffer[0].start = _start; \
trace_buffer[0].level = 0; \
trace_buffer[0].ptr = _ptr1; \
trace_buffer[1].last = 0; \
trace_buffer[1].ptr = _ptr2; \
idx = ZEND_JIT_TRACE_START_REC_SIZE;
#define TRACE_END(_op, _stop, _ptr) \
trace_buffer[1].last = idx; \
trace_buffer[idx].op = _op; \
trace_buffer[idx].start = trace_buffer[idx].start; \
trace_buffer[idx].stop = trace_buffer[0].stop = _stop; \
trace_buffer[idx].level = trace_buffer[0].level = ret_level ? ret_level + 1 : 0; \
trace_buffer[idx].ptr = _ptr;
static int zend_jit_trace_recursive_call_count(const zend_op_array *op_array, const zend_op_array **unrolled_calls, int ret_level, int level)
{
int i;
int count = 0;
for (i = ret_level; i < level; i++) {
count += (unrolled_calls[i] == op_array);
}
return count;
}
static int zend_jit_trace_recursive_ret_count(const zend_op_array *op_array, const zend_op_array **unrolled_calls, int ret_level)
{
int i;
int count = 0;
for (i = 0; i < ret_level; i++) {
count += (unrolled_calls[i] == op_array);
}
return count;
}
static int zend_jit_trace_has_recursive_ret(zend_execute_data *ex, const zend_op_array *orig_op_array, const zend_op *orig_opline, int ret_level)
{
while (ex != NULL && ex->func != NULL && ret_level < ZEND_JIT_TRACE_MAX_RET_DEPTH) {
if (&ex->func->op_array == orig_op_array && ex->opline + 1 == orig_opline) {
return 1;
}
ex = ex->prev_execute_data;
ret_level++;
}
return 0;
}
static uint8_t zend_jit_trace_bad_stop_event(const zend_op *opline, int count)
{
const zend_op **cache_opline = JIT_G(bad_root_cache_opline);
uint8_t *cache_count = JIT_G(bad_root_cache_count);
uint8_t *cache_stop = JIT_G(bad_root_cache_stop);
uint32_t i;
if (count < 0) {
count = 0;
}
for (i = 0; i < ZEND_JIT_TRACE_BAD_ROOT_SLOTS; i++) {
if (cache_opline[i] == opline) {
if (cache_count[i] >= count) {
return cache_stop[i];
}
break;
}
}
return 0;
}
#define ZEND_CALL_MEGAMORPHIC ZEND_CALL_JIT_RESERVED
static int zend_jit_trace_record_fake_init_call_ex(zend_execute_data *call, zend_jit_trace_rec *trace_buffer, int idx, uint32_t is_megamorphic, uint32_t init_level)
{
zend_jit_trace_stop stop ZEND_ATTRIBUTE_UNUSED = ZEND_JIT_TRACE_STOP_ERROR;
do {
zend_function *func;
zend_jit_op_array_trace_extension *jit_extension;
if (call->prev_execute_data) {
idx = zend_jit_trace_record_fake_init_call_ex(call->prev_execute_data, trace_buffer, idx, is_megamorphic, init_level + 1);
if (idx < 0) {
return idx;
}
}
func = call->func;
if (func->type == ZEND_INTERNAL_FUNCTION
&& (func->op_array.fn_flags & (ZEND_ACC_CLOSURE|ZEND_ACC_FAKE_CLOSURE))) {
func = NULL;
} else if (func->type == ZEND_USER_FUNCTION) {
jit_extension =
(zend_jit_op_array_trace_extension*)ZEND_FUNC_INFO(&func->op_array);
if (UNEXPECTED(!jit_extension && (func->op_array.fn_flags & ZEND_ACC_CLOSURE))
|| (jit_extension && !(jit_extension->func_info.flags & ZEND_FUNC_JIT_ON_HOT_TRACE))
|| (func->op_array.fn_flags & ZEND_ACC_FAKE_CLOSURE)) {
func = NULL;
} else if (func->op_array.fn_flags & ZEND_ACC_CLOSURE) {
func = (zend_function*)jit_extension->op_array;
}
}
if (!func
|| (func->common.fn_flags & ZEND_ACC_CALL_VIA_TRAMPOLINE)
|| (func->common.fn_flags & ZEND_ACC_NEVER_CACHE)
|| func->common.prop_info) {
/* continue recording */
func = NULL;
} else if (is_megamorphic == ZEND_JIT_EXIT_POLYMORPHISM
/* TODO: use more accurate check ??? */
&& ((ZEND_CALL_INFO(call) & ZEND_CALL_DYNAMIC)
|| func->common.scope)) {
func = NULL;
ZEND_ADD_CALL_FLAG(call, ZEND_CALL_MEGAMORPHIC);
}
TRACE_RECORD(ZEND_JIT_TRACE_INIT_CALL, ZEND_JIT_TRACE_FAKE_INFO(init_level), func);
} while (0);
return idx;
}
static int zend_jit_trace_record_fake_init_call(zend_execute_data *call, zend_jit_trace_rec *trace_buffer, int idx, uint32_t is_megamorphic)
{
return zend_jit_trace_record_fake_init_call_ex(call, trace_buffer, idx, is_megamorphic, 0);
}
static int zend_jit_trace_subtrace(zend_jit_trace_rec *trace_buffer, int start, int end, uint8_t event, const zend_op_array *op_array, const zend_op *opline)
{
int idx;
TRACE_START(ZEND_JIT_TRACE_START, event, op_array, opline);
memmove(trace_buffer + idx, trace_buffer + start, (end - start) * sizeof(zend_jit_trace_rec));
return idx + (end - start);
}
/*
* Trace Linking Rules
* ===================
*
* flags
* +----------+----------+----------++----------+----------+----------+
* | || JIT |
* +----------+----------+----------++----------+----------+----------+
* start | LOOP | ENTER | RETURN || LOOP | ENTER | RETURN |
* +========+==========+==========+==========++==========+==========+==========+
* | LOOP | loop | | loop-ret || COMPILED | LINK | LINK |
* +--------+----------+----------+----------++----------+----------+----------+
* | ENTER |INNER_LOOP| rec-call | return || LINK | LINK | LINK |
* +--------+----------+----------+----------++----------+----------+----------+
* | RETURN |INNER_LOOP| | rec-ret || LINK | | LINK |
* +--------+----------+----------+----------++----------+----------+----------+
* | SIDE | unroll | | side-ret || LINK | LINK | LINK |
* +--------+----------+----------+----------++----------+----------+----------+
*
* loop: LOOP if "cycle" and level == 0, otherwise INNER_LOOP
* INNER_LOOP: abort recording and start new one (wait for loop)
* COMPILED: abort recording (wait while side exit creates outer loop)
* unroll: continue recording while unroll limit reached
* rec-call: RECURSIVE_CALL if "cycle" and level > N, otherwise continue
* loop-ret: LOOP_EXIT if level == 0, otherwise continue (wait for loop)
* return: RETURN if level == 0
* rec_ret: RECURSIVE_RET if "cycle" and ret_level > N, otherwise continue
* side_ret: RETURN if level == 0 && ret_level == ret_depth, otherwise continue
*
*/
zend_jit_trace_stop ZEND_FASTCALL zend_jit_trace_execute(zend_execute_data *ex,
const zend_op *op,
zend_jit_trace_rec *trace_buffer,
uint8_t start,
uint32_t is_megamorphic,
int ret_depth)
{
#ifdef HAVE_GCC_GLOBAL_REGS
zend_execute_data *save_execute_data = execute_data;
const zend_op *save_opline = opline;
#endif
const zend_op *orig_opline, *end_opline;
zend_jit_trace_stop stop = ZEND_JIT_TRACE_STOP_ERROR;
zend_jit_trace_stop halt = 0;
int level = 0;
int ret_level = 0;
zend_vm_opcode_handler_t handler;
const zend_op_array *op_array;
zend_jit_op_array_trace_extension *jit_extension;
size_t offset;
int idx, count;
uint8_t trace_flags, op1_type, op2_type, op3_type;
zend_class_entry *ce1, *ce2;
const zend_op *link_to_enter_opline = NULL;
int backtrack_link_to_enter = -1;
int backtrack_recursion = -1;
int backtrack_ret_recursion = -1;
int backtrack_ret_recursion_level = 0;
int loop_unroll_limit = 0;
int last_loop = -1;
int last_loop_level = -1;
const zend_op *last_loop_opline = NULL;
const zend_op_array *unrolled_calls[ZEND_JIT_TRACE_MAX_CALL_DEPTH + ZEND_JIT_TRACE_MAX_RET_DEPTH];
#ifdef HAVE_GCC_GLOBAL_REGS
zend_execute_data *prev_execute_data = ex;
execute_data = ex;
opline = EX(opline) = op;
#else
int rc;
zend_execute_data *execute_data = ex;
const zend_op *opline = EX(opline);
#endif
zend_execute_data *prev_call = EX(call);
orig_opline = opline;
op_array = &EX(func)->op_array;
jit_extension =
(zend_jit_op_array_trace_extension*)ZEND_FUNC_INFO(op_array);
offset = jit_extension->offset;
if (!op_array->function_name
|| (op_array->fn_flags & ZEND_ACC_CLOSURE)) {
op_array = jit_extension->op_array;
}
TRACE_START(ZEND_JIT_TRACE_START, start, op_array, opline);
if (UNEXPECTED(opline->opcode == ZEND_HANDLE_EXCEPTION)) {
/* Abort trace because of exception */
TRACE_END(ZEND_JIT_TRACE_END, ZEND_JIT_TRACE_STOP_EXCEPTION, opline);
#ifdef HAVE_GCC_GLOBAL_REGS
execute_data = save_execute_data;
opline = save_opline;
#endif
return ZEND_JIT_TRACE_STOP_EXCEPTION;
}
trace_flags = ZEND_OP_TRACE_INFO(opline, offset)->trace_flags;
if (trace_flags & ZEND_JIT_TRACE_UNSUPPORTED) {
TRACE_END(ZEND_JIT_TRACE_END, ZEND_JIT_TRACE_STOP_NOT_SUPPORTED, opline);
#ifdef HAVE_GCC_GLOBAL_REGS
execute_data = save_execute_data;
opline = save_opline;
#endif
return ZEND_JIT_TRACE_STOP_NOT_SUPPORTED;
}
if (prev_call) {
int ret = zend_jit_trace_record_fake_init_call(prev_call, trace_buffer, idx, is_megamorphic);
if (ret < 0) {
TRACE_END(ZEND_JIT_TRACE_END, ZEND_JIT_TRACE_STOP_BAD_FUNC, opline);
#ifdef HAVE_GCC_GLOBAL_REGS
execute_data = save_execute_data;
opline = save_opline;
#endif
return ZEND_JIT_TRACE_STOP_BAD_FUNC;
}
idx = ret;
}
while (1) {
ce1 = ce2 = NULL;
op1_type = op2_type = op3_type = IS_UNKNOWN;
if ((opline->op1_type & (IS_TMP_VAR|IS_VAR|IS_CV))
&& opline->opcode != ZEND_ROPE_ADD
&& opline->opcode != ZEND_ROPE_END
&& opline->opcode != ZEND_NEW
&& opline->opcode != ZEND_FETCH_CLASS_CONSTANT
&& opline->opcode != ZEND_INIT_STATIC_METHOD_CALL) {
zval *zv = EX_VAR(opline->op1.var);
op1_type = Z_TYPE_P(zv);
uint8_t flags = 0;
if (op1_type == IS_INDIRECT) {
zv = Z_INDIRECT_P(zv);
op1_type = Z_TYPE_P(zv);
flags |= IS_TRACE_INDIRECT;
}
if (op1_type == IS_REFERENCE) {
zv = Z_REFVAL_P(zv);
op1_type = Z_TYPE_P(zv);
flags |= IS_TRACE_REFERENCE;
}
if (Z_TYPE_P(zv) == IS_OBJECT) {
ce1 = Z_OBJCE_P(zv);
} else if (Z_TYPE_P(zv) == IS_ARRAY) {
if (HT_IS_PACKED(Z_ARRVAL_P(zv))) {
flags |= IS_TRACE_PACKED;
}
}
op1_type |= flags;
} else if (opline->op1_type == IS_UNUSED && (op_array->fn_flags & ZEND_ACC_CLOSURE)) {
uint32_t op1_flags = ZEND_VM_OP1_FLAGS(zend_get_opcode_flags(opline->opcode));
if ((op1_flags & ZEND_VM_OP_MASK) == ZEND_VM_OP_THIS) {
op1_type = IS_OBJECT;
ce1 = Z_OBJCE(EX(This));
}
}
if (opline->op2_type & (IS_TMP_VAR|IS_VAR|IS_CV)
&& opline->opcode != ZEND_INSTANCEOF
&& opline->opcode != ZEND_UNSET_STATIC_PROP
&& opline->opcode != ZEND_ISSET_ISEMPTY_STATIC_PROP
&& opline->opcode != ZEND_ASSIGN_STATIC_PROP
&& opline->opcode != ZEND_ASSIGN_STATIC_PROP_REF
&& opline->opcode != ZEND_ASSIGN_STATIC_PROP_OP
&& opline->opcode != ZEND_PRE_INC_STATIC_PROP
&& opline->opcode != ZEND_POST_INC_STATIC_PROP
&& opline->opcode != ZEND_PRE_DEC_STATIC_PROP
&& opline->opcode != ZEND_POST_DEC_STATIC_PROP
&& opline->opcode != ZEND_FETCH_STATIC_PROP_R
&& opline->opcode != ZEND_FETCH_STATIC_PROP_W
&& opline->opcode != ZEND_FETCH_STATIC_PROP_RW
&& opline->opcode != ZEND_FETCH_STATIC_PROP_IS
&& opline->opcode != ZEND_FETCH_STATIC_PROP_FUNC_ARG
&& opline->opcode != ZEND_FETCH_STATIC_PROP_UNSET
&& (opline->op2_type == IS_CV
|| (opline->opcode != ZEND_FE_FETCH_R
&& opline->opcode != ZEND_FE_FETCH_RW))) {
zval *zv = EX_VAR(opline->op2.var);
uint8_t flags = 0;
op2_type = Z_TYPE_P(zv);
if (op2_type == IS_INDIRECT) {
zv = Z_INDIRECT_P(zv);
op2_type = Z_TYPE_P(zv);
flags |= IS_TRACE_INDIRECT;
}
if (op2_type == IS_REFERENCE) {
zv = Z_REFVAL_P(zv);
op2_type = Z_TYPE_P(zv);
flags |= IS_TRACE_REFERENCE;
}
if (Z_TYPE_P(zv) == IS_OBJECT) {
ce2 = Z_OBJCE_P(zv);
}
op2_type |= flags;
}
if (opline->opcode == ZEND_ASSIGN_DIM ||
opline->opcode == ZEND_ASSIGN_OBJ ||
opline->opcode == ZEND_ASSIGN_STATIC_PROP ||
opline->opcode == ZEND_ASSIGN_DIM_OP ||
opline->opcode == ZEND_ASSIGN_OBJ_OP ||
opline->opcode == ZEND_ASSIGN_STATIC_PROP_OP ||
opline->opcode == ZEND_ASSIGN_OBJ_REF ||
opline->opcode == ZEND_ASSIGN_STATIC_PROP_REF) {
if ((opline+1)->op1_type & (IS_TMP_VAR|IS_VAR|IS_CV)) {
zval *zv = EX_VAR((opline+1)->op1.var);
uint8_t flags = 0;
op3_type = Z_TYPE_P(zv);
if (op3_type == IS_INDIRECT) {
zv = Z_INDIRECT_P(zv);
op3_type = Z_TYPE_P(zv);
flags |= IS_TRACE_INDIRECT;
}
if (op3_type == IS_REFERENCE) {
zv = Z_REFVAL_P(zv);
op3_type = Z_TYPE_P(zv);
flags |= IS_TRACE_REFERENCE;
}
op3_type |= flags;
}
}
TRACE_RECORD_VM(ZEND_JIT_TRACE_VM, opline, op1_type, op2_type, op3_type);
if (ce1) {
TRACE_RECORD(ZEND_JIT_TRACE_OP1_TYPE, 0, ce1);
}
if (ce2) {
TRACE_RECORD(ZEND_JIT_TRACE_OP2_TYPE, 0, ce2);
}
switch (opline->opcode) {
case ZEND_FETCH_DIM_R:
case ZEND_FETCH_DIM_W:
case ZEND_FETCH_DIM_RW:
case ZEND_FETCH_DIM_IS:
case ZEND_FETCH_DIM_FUNC_ARG:
case ZEND_FETCH_DIM_UNSET:
case ZEND_FETCH_LIST_R:
case ZEND_FETCH_LIST_W:
case ZEND_ASSIGN_DIM:
case ZEND_ASSIGN_DIM_OP:
case ZEND_UNSET_DIM:
case ZEND_ISSET_ISEMPTY_DIM_OBJ:
if (opline->op1_type == IS_CONST) {
zval *arr = RT_CONSTANT(opline, opline->op1);
op1_type = Z_TYPE_P(arr);
}
if ((op1_type & IS_TRACE_TYPE_MASK) == IS_ARRAY
&& opline->op2_type != IS_UNDEF) {
zval *arr, *dim, *val;
uint8_t val_type = IS_UNDEF;
if (opline->op2_type == IS_CONST) {
dim = RT_CONSTANT(opline, opline->op2);
} else {
dim = EX_VAR(opline->op2.var);
}
if (Z_TYPE_P(dim) == IS_LONG || Z_TYPE_P(dim) == IS_STRING) {
if (opline->op1_type == IS_CONST) {
arr = RT_CONSTANT(opline, opline->op1);
} else {
arr = EX_VAR(opline->op1.var);
}
if (Z_TYPE_P(arr) == IS_INDIRECT) {
arr = Z_INDIRECT_P(arr);
}
if (Z_TYPE_P(arr) == IS_REFERENCE) {
arr = Z_REFVAL_P(arr);
}
ZEND_ASSERT(Z_TYPE_P(arr) == IS_ARRAY);
if (Z_TYPE_P(dim) == IS_LONG) {
val = zend_hash_index_find(Z_ARRVAL_P(arr), Z_LVAL_P(dim));
} else /*if Z_TYPE_P(dim) == IS_STRING)*/ {
val = zend_symtable_find(Z_ARRVAL_P(arr), Z_STR_P(dim));
}
if (val) {
val_type = Z_TYPE_P(val);
}
TRACE_RECORD_VM(ZEND_JIT_TRACE_VAL_INFO, NULL, val_type, 0, 0);
}
}
break;
case ZEND_FETCH_OBJ_R: {
if (opline->op2_type == IS_CONST) {
/* Remove the SIMPLE_GET flag to avoid inlining hooks. */
void **cache_slot = CACHE_ADDR(opline->extended_value & ~ZEND_FETCH_REF);
uintptr_t prop_offset = (uintptr_t)CACHED_PTR_EX(cache_slot + 1);
if (IS_HOOKED_PROPERTY_OFFSET(prop_offset)) {
CACHE_PTR_EX(cache_slot + 1, (void*)((uintptr_t)CACHED_PTR_EX(cache_slot + 1) & ~ZEND_PROPERTY_HOOK_SIMPLE_GET_BIT)); \
}
}
ZEND_FALLTHROUGH;
}
case ZEND_FETCH_OBJ_W:
case ZEND_FETCH_OBJ_RW:
case ZEND_FETCH_OBJ_IS:
case ZEND_FETCH_OBJ_FUNC_ARG:
case ZEND_FETCH_OBJ_UNSET:
case ZEND_ASSIGN_OBJ:
case ZEND_ASSIGN_OBJ_OP:
case ZEND_ASSIGN_OBJ_REF:
case ZEND_UNSET_OBJ:
case ZEND_ISSET_ISEMPTY_PROP_OBJ:
case ZEND_PRE_INC_OBJ:
case ZEND_PRE_DEC_OBJ:
case ZEND_POST_INC_OBJ:
case ZEND_POST_DEC_OBJ:
if (opline->op1_type != IS_CONST
&& opline->op2_type == IS_CONST
&& Z_TYPE_P(RT_CONSTANT(opline, opline->op2)) == IS_STRING
&& Z_STRVAL_P(RT_CONSTANT(opline, opline->op2))[0] != '\0') {
zval *obj, *val;
zend_string *prop_name = Z_STR_P(RT_CONSTANT(opline, opline->op2));
zend_property_info *prop_info;
if (opline->op1_type == IS_UNUSED) {
obj = &EX(This);
} else {
obj = EX_VAR(opline->op1.var);
}
if (Z_TYPE_P(obj) != IS_OBJECT
|| Z_OBJ_P(obj)->handlers != &std_object_handlers) {
break;
}
prop_info = zend_get_property_info(Z_OBJCE_P(obj), prop_name, 1);
if (prop_info
&& prop_info != ZEND_WRONG_PROPERTY_INFO
&& !prop_info->hooks
&& !(prop_info->flags & ZEND_ACC_STATIC)) {
val = OBJ_PROP(Z_OBJ_P(obj), prop_info->offset);
TRACE_RECORD_VM(ZEND_JIT_TRACE_VAL_INFO, NULL, Z_TYPE_P(val), 0, 0);
}
}
break;
default:
break;
}
if (opline->opcode == ZEND_DO_FCALL
|| opline->opcode == ZEND_DO_ICALL
|| opline->opcode == ZEND_DO_UCALL
|| opline->opcode == ZEND_DO_FCALL_BY_NAME) {
if (ZEND_CALL_INFO(EX(call)) & ZEND_CALL_MEGAMORPHIC) {
stop = ZEND_JIT_TRACE_STOP_INTERPRETER;
break;
}
if (EX(call)->func->type == ZEND_INTERNAL_FUNCTION) {
zend_function *func = EX(call)->func;
if ((func->op_array.fn_flags & ZEND_ACC_CALL_VIA_TRAMPOLINE)
|| (func->common.fn_flags & ZEND_ACC_NEVER_CACHE)
|| func->common.prop_info) {
/* continue recording */
func = NULL;
} else if (func->op_array.fn_flags & (ZEND_ACC_CLOSURE|ZEND_ACC_FAKE_CLOSURE)) {
stop = ZEND_JIT_TRACE_STOP_BAD_FUNC;
break;
}
TRACE_RECORD(ZEND_JIT_TRACE_DO_ICALL, 0, func);
}
} else if (opline->opcode == ZEND_INCLUDE_OR_EVAL
|| opline->opcode == ZEND_CALLABLE_CONVERT) {
/* TODO: Support tracing JIT for ZEND_CALLABLE_CONVERT. */
stop = ZEND_JIT_TRACE_STOP_INTERPRETER;
break;
}
handler = (zend_vm_opcode_handler_t)ZEND_OP_TRACE_INFO(opline, offset)->call_handler;
#ifdef HAVE_GCC_GLOBAL_REGS
handler();
if (UNEXPECTED(opline == zend_jit_halt_op)) {
stop = ZEND_JIT_TRACE_STOP_RETURN;
opline = NULL;
halt = ZEND_JIT_TRACE_HALT;
break;
}
if (UNEXPECTED(execute_data != prev_execute_data)) {