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zend_jit.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 |
| [email protected] so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
| Authors: Dmitry Stogov <[email protected]> |
+----------------------------------------------------------------------+
*/
#include "main/php.h"
#include "main/SAPI.h"
#include "php_version.h"
#include <ZendAccelerator.h>
#include "zend_shared_alloc.h"
#include "Zend/zend_execute.h"
#include "Zend/zend_vm.h"
#include "Zend/zend_exceptions.h"
#include "Zend/zend_constants.h"
#include "Zend/zend_closures.h"
#include "Zend/zend_ini.h"
#include "Zend/zend_observer.h"
#include "zend_smart_str.h"
#include "jit/zend_jit.h"
#ifdef HAVE_JIT
#include "Optimizer/zend_func_info.h"
#include "Optimizer/zend_ssa.h"
#include "Optimizer/zend_inference.h"
#include "Optimizer/zend_call_graph.h"
#include "Optimizer/zend_dump.h"
#include "Optimizer/zend_worklist.h"
#include "jit/zend_jit_internal.h"
#ifdef HAVE_PTHREAD_JIT_WRITE_PROTECT_NP
#include <pthread.h>
#endif
#ifdef ZTS
int jit_globals_id;
#else
zend_jit_globals jit_globals;
#endif
//#define CONTEXT_THREADED_JIT
#define ZEND_JIT_USE_RC_INFERENCE
#ifdef ZEND_JIT_USE_RC_INFERENCE
# define ZEND_SSA_RC_INFERENCE_FLAG ZEND_SSA_RC_INFERENCE
# define RC_MAY_BE_1(info) (((info) & (MAY_BE_RC1|MAY_BE_REF)) != 0)
# define RC_MAY_BE_N(info) (((info) & (MAY_BE_RCN|MAY_BE_REF)) != 0)
#else
# define ZEND_SSA_RC_INFERENCE_FLAG 0
# define RC_MAY_BE_1(info) 1
# define RC_MAY_BE_N(info) 1
#endif
#define JIT_PREFIX "JIT$"
#define JIT_STUB_PREFIX "JIT$$"
#define TRACE_PREFIX "TRACE-"
zend_ulong zend_jit_profile_counter = 0;
int zend_jit_profile_counter_rid = -1;
int16_t zend_jit_hot_counters[ZEND_HOT_COUNTERS_COUNT];
const zend_op *zend_jit_halt_op = NULL;
static int zend_jit_vm_kind = 0;
#ifdef HAVE_PTHREAD_JIT_WRITE_PROTECT_NP
static int zend_write_protect = 1;
#endif
static void *dasm_buf = NULL;
static void *dasm_end = NULL;
static void **dasm_ptr = NULL;
static size_t dasm_size = 0;
static zend_long jit_bisect_pos = 0;
static const void *zend_jit_runtime_jit_handler = NULL;
static const void *zend_jit_profile_jit_handler = NULL;
static const void *zend_jit_func_hot_counter_handler = NULL;
static const void *zend_jit_loop_hot_counter_handler = NULL;
static const void *zend_jit_func_trace_counter_handler = NULL;
static const void *zend_jit_ret_trace_counter_handler = NULL;
static const void *zend_jit_loop_trace_counter_handler = NULL;
static int ZEND_FASTCALL zend_runtime_jit(void);
static int zend_jit_trace_op_len(const zend_op *opline);
static int zend_jit_trace_may_exit(const zend_op_array *op_array, const zend_op *opline);
static uint32_t zend_jit_trace_get_exit_point(const zend_op *to_opline, uint32_t flags);
static const void *zend_jit_trace_get_exit_addr(uint32_t n);
static void zend_jit_trace_add_code(const void *start, uint32_t size);
static zend_string *zend_jit_func_name(const zend_op_array *op_array);
static bool zend_jit_needs_arg_dtor(const zend_function *func, uint32_t arg_num, zend_call_info *call_info);
static bool zend_jit_supported_binary_op(uint8_t op, uint32_t op1_info, uint32_t op2_info);
static bool dominates(const zend_basic_block *blocks, int a, int b) {
while (blocks[b].level > blocks[a].level) {
b = blocks[b].idom;
}
return a == b;
}
static bool zend_ssa_is_last_use(const zend_op_array *op_array, const zend_ssa *ssa, int var, int use)
{
int next_use;
if (ssa->vars[var].phi_use_chain) {
zend_ssa_phi *phi = ssa->vars[var].phi_use_chain;
do {
if (!ssa->vars[phi->ssa_var].no_val) {
return 0;
}
phi = zend_ssa_next_use_phi(ssa, var, phi);
} while (phi);
}
if (ssa->cfg.blocks[ssa->cfg.map[use]].loop_header > 0
|| (ssa->cfg.blocks[ssa->cfg.map[use]].flags & ZEND_BB_LOOP_HEADER)) {
int b = ssa->cfg.map[use];
int prev_use = ssa->vars[var].use_chain;
int def_block;
if (ssa->vars[var].definition >= 0) {
def_block =ssa->cfg.map[ssa->vars[var].definition];
} else {
ZEND_ASSERT(ssa->vars[var].definition_phi);
def_block = ssa->vars[var].definition_phi->block;
}
if (dominates(ssa->cfg.blocks, def_block,
(ssa->cfg.blocks[b].flags & ZEND_BB_LOOP_HEADER) ? b : ssa->cfg.blocks[b].loop_header)) {
return 0;
}
while (prev_use >= 0 && prev_use != use) {
if (b != ssa->cfg.map[prev_use]
&& dominates(ssa->cfg.blocks, b, ssa->cfg.map[prev_use])
&& !zend_ssa_is_no_val_use(op_array->opcodes + prev_use, ssa->ops + prev_use, var)) {
return 0;
}
prev_use = zend_ssa_next_use(ssa->ops, var, prev_use);
}
}
next_use = zend_ssa_next_use(ssa->ops, var, use);
if (next_use < 0) {
return 1;
} else if (zend_ssa_is_no_val_use(op_array->opcodes + next_use, ssa->ops + next_use, var)) {
return 1;
}
return 0;
}
static int zend_jit_is_constant_cmp_long_long(const zend_op *opline,
zend_ssa_range *op1_range,
zend_jit_addr op1_addr,
zend_ssa_range *op2_range,
zend_jit_addr op2_addr,
bool *result)
{
zend_long op1_min;
zend_long op1_max;
zend_long op2_min;
zend_long op2_max;
if (op1_range) {
op1_min = op1_range->min;
op1_max = op1_range->max;
} else if (Z_MODE(op1_addr) == IS_CONST_ZVAL) {
ZEND_ASSERT(Z_TYPE_P(Z_ZV(op1_addr)) == IS_LONG);
op1_min = op1_max = Z_LVAL_P(Z_ZV(op1_addr));
} else {
return 0;
}
if (op2_range) {
op2_min = op2_range->min;
op2_max = op2_range->max;
} else if (Z_MODE(op2_addr) == IS_CONST_ZVAL) {
ZEND_ASSERT(Z_TYPE_P(Z_ZV(op2_addr)) == IS_LONG);
op2_min = op2_max = Z_LVAL_P(Z_ZV(op2_addr));
} else {
return 0;
}
switch (opline->opcode) {
case ZEND_IS_EQUAL:
case ZEND_IS_IDENTICAL:
case ZEND_CASE:
case ZEND_CASE_STRICT:
if (op1_min == op1_max && op2_min == op2_max && op1_min == op2_min) {
*result = 1;
return 1;
} else if (op1_max < op2_min || op1_min > op2_max) {
*result = 0;
return 1;
}
return 0;
case ZEND_IS_NOT_EQUAL:
case ZEND_IS_NOT_IDENTICAL:
if (op1_min == op1_max && op2_min == op2_max && op1_min == op2_min) {
*result = 0;
return 1;
} else if (op1_max < op2_min || op1_min > op2_max) {
*result = 1;
return 1;
}
return 0;
case ZEND_IS_SMALLER:
if (op1_max < op2_min) {
*result = 1;
return 1;
} else if (op1_min >= op2_max) {
*result = 0;
return 1;
}
return 0;
case ZEND_IS_SMALLER_OR_EQUAL:
if (op1_max <= op2_min) {
*result = 1;
return 1;
} else if (op1_min > op2_max) {
*result = 0;
return 1;
}
return 0;
default:
ZEND_UNREACHABLE();
}
return 0;
}
#define ADVANCE_SSA_OP(ssa_op, offset) \
do { \
if (ssa_op) ssa_op += offset; \
} while (0)
static int zend_jit_needs_call_chain(zend_call_info *call_info, uint32_t b, const zend_op_array *op_array, zend_ssa *ssa, const zend_ssa_op *ssa_op, const zend_op *opline, int call_level, zend_jit_trace_rec *trace)
{
int skip;
if (trace) {
zend_jit_trace_rec *p = trace;
ADVANCE_SSA_OP(ssa_op, 1);
while (1) {
if (p->op == ZEND_JIT_TRACE_VM) {
switch (p->opline->opcode) {
case ZEND_SEND_ARRAY:
case ZEND_SEND_USER:
case ZEND_SEND_UNPACK:
case ZEND_INIT_FCALL:
case ZEND_INIT_METHOD_CALL:
case ZEND_INIT_STATIC_METHOD_CALL:
case ZEND_INIT_PARENT_PROPERTY_HOOK_CALL:
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:
case ZEND_FAST_CALL:
case ZEND_JMP:
case ZEND_JMPZ:
case ZEND_JMPNZ:
case ZEND_JMPZ_EX:
case ZEND_JMPNZ_EX:
case ZEND_FE_RESET_R:
case ZEND_FE_RESET_RW:
case ZEND_JMP_SET:
case ZEND_COALESCE:
case ZEND_JMP_NULL:
case ZEND_ASSERT_CHECK:
case ZEND_CATCH:
case ZEND_DECLARE_ANON_CLASS:
case ZEND_FE_FETCH_R:
case ZEND_FE_FETCH_RW:
case ZEND_BIND_INIT_STATIC_OR_JMP:
case ZEND_JMP_FRAMELESS:
return 1;
case ZEND_DO_ICALL:
case ZEND_DO_UCALL:
case ZEND_DO_FCALL_BY_NAME:
case ZEND_DO_FCALL:
case ZEND_CALLABLE_CONVERT:
return 0;
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:
/* skip */
break;
default:
if (zend_may_throw(opline, ssa_op, op_array, ssa)) {
return 1;
}
}
ADVANCE_SSA_OP(ssa_op, zend_jit_trace_op_len(opline));
} else if (p->op == ZEND_JIT_TRACE_ENTER ||
p->op == ZEND_JIT_TRACE_BACK ||
p->op == ZEND_JIT_TRACE_END) {
return 1;
}
p++;
}
}
if (!call_info) {
const zend_op *end = op_array->opcodes + op_array->last;
opline++;
ADVANCE_SSA_OP(ssa_op, 1);
skip = (call_level == 1);
while (opline != end) {
if (!skip) {
if (zend_may_throw(opline, ssa_op, op_array, ssa)) {
return 1;
}
}
switch (opline->opcode) {
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:
skip = 0;
break;
case ZEND_SEND_ARRAY:
case ZEND_SEND_USER:
case ZEND_SEND_UNPACK:
case ZEND_INIT_FCALL:
case ZEND_INIT_METHOD_CALL:
case ZEND_INIT_STATIC_METHOD_CALL:
case ZEND_INIT_PARENT_PROPERTY_HOOK_CALL:
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:
case ZEND_FAST_CALL:
case ZEND_JMP:
case ZEND_JMPZ:
case ZEND_JMPNZ:
case ZEND_JMPZ_EX:
case ZEND_JMPNZ_EX:
case ZEND_FE_RESET_R:
case ZEND_FE_RESET_RW:
case ZEND_JMP_SET:
case ZEND_COALESCE:
case ZEND_JMP_NULL:
case ZEND_ASSERT_CHECK:
case ZEND_CATCH:
case ZEND_DECLARE_ANON_CLASS:
case ZEND_FE_FETCH_R:
case ZEND_FE_FETCH_RW:
case ZEND_BIND_INIT_STATIC_OR_JMP:
case ZEND_JMP_FRAMELESS:
return 1;
case ZEND_DO_ICALL:
case ZEND_DO_UCALL:
case ZEND_DO_FCALL_BY_NAME:
case ZEND_DO_FCALL:
case ZEND_CALLABLE_CONVERT:
end = opline;
if (end - op_array->opcodes >= ssa->cfg.blocks[b].start + ssa->cfg.blocks[b].len) {
/* INIT_FCALL and DO_FCALL in different BasicBlocks */
return 1;
}
return 0;
}
opline++;
ADVANCE_SSA_OP(ssa_op, 1);
}
return 1;
} else {
const zend_op *end = call_info->caller_call_opline;
/* end may be null if an opcode like EXIT is part of the argument list. */
if (!end || end - op_array->opcodes >= ssa->cfg.blocks[b].start + ssa->cfg.blocks[b].len) {
/* INIT_FCALL and DO_FCALL in different BasicBlocks */
return 1;
}
opline++;
ADVANCE_SSA_OP(ssa_op, 1);
skip = (call_level == 1);
while (opline != end) {
if (skip) {
switch (opline->opcode) {
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:
skip = 0;
break;
case ZEND_SEND_ARRAY:
case ZEND_SEND_USER:
case ZEND_SEND_UNPACK:
return 1;
}
} else {
if (zend_may_throw(opline, ssa_op, op_array, ssa)) {
return 1;
}
}
opline++;
ADVANCE_SSA_OP(ssa_op, 1);
}
return 0;
}
}
static uint32_t skip_valid_arguments(const zend_op_array *op_array, zend_ssa *ssa, const zend_call_info *call_info)
{
uint32_t num_args = 0;
zend_function *func = call_info->callee_func;
/* It's okay to handle prototypes here, because they can only increase the accepted arguments.
* Anything legal for the parent method is also legal for the parent method. */
while (num_args < call_info->num_args) {
zend_arg_info *arg_info = func->op_array.arg_info + num_args;
if (ZEND_TYPE_IS_SET(arg_info->type)) {
if (ZEND_TYPE_IS_ONLY_MASK(arg_info->type)) {
zend_op *opline = call_info->arg_info[num_args].opline;
zend_ssa_op *ssa_op = ssa->ops ? &ssa->ops[opline - op_array->opcodes] : NULL;
uint32_t type_mask = ZEND_TYPE_PURE_MASK(arg_info->type);
if ((OP1_INFO() & (MAY_BE_ANY|MAY_BE_UNDEF)) & ~type_mask) {
break;
}
} else {
break;
}
}
num_args++;
}
return num_args;
}
static uint32_t zend_ssa_cv_info(const zend_op_array *op_array, zend_ssa *ssa, uint32_t var)
{
uint32_t j, info;
if (ssa->vars && ssa->var_info) {
info = ssa->var_info[var].type;
for (j = op_array->last_var; j < ssa->vars_count; j++) {
if (ssa->vars[j].var == var) {
info |= ssa->var_info[j].type;
}
}
} else {
info = MAY_BE_RC1 | MAY_BE_RCN | MAY_BE_REF | MAY_BE_ANY | MAY_BE_UNDEF |
MAY_BE_ARRAY_KEY_ANY | MAY_BE_ARRAY_OF_ANY | MAY_BE_ARRAY_OF_REF;
}
#ifdef ZEND_JIT_USE_RC_INFERENCE
/* Refcount may be increased by RETURN opcode */
if ((info & MAY_BE_RC1) && !(info & MAY_BE_RCN)) {
for (j = 0; j < ssa->cfg.blocks_count; j++) {
if ((ssa->cfg.blocks[j].flags & ZEND_BB_REACHABLE) &&
ssa->cfg.blocks[j].len > 0) {
const zend_op *opline = op_array->opcodes + ssa->cfg.blocks[j].start + ssa->cfg.blocks[j].len - 1;
if (opline->opcode == ZEND_RETURN) {
if (opline->op1_type == IS_CV && opline->op1.var == EX_NUM_TO_VAR(var)) {
info |= MAY_BE_RCN;
break;
}
}
}
}
}
#endif
return info;
}
static bool zend_jit_may_avoid_refcounting(const zend_op *opline, uint32_t op1_info)
{
switch (opline->opcode) {
case ZEND_FETCH_OBJ_FUNC_ARG:
if (!JIT_G(current_frame) ||
!JIT_G(current_frame)->call->func ||
!TRACE_FRAME_IS_LAST_SEND_BY_VAL(JIT_G(current_frame)->call)) {
return 0;
}
/* break missing intentionally */
case ZEND_FETCH_OBJ_R:
case ZEND_FETCH_OBJ_IS:
if ((op1_info & MAY_BE_OBJECT)
&& 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') {
return 1;
}
break;
case ZEND_FETCH_DIM_FUNC_ARG:
if (!JIT_G(current_frame) ||
!JIT_G(current_frame)->call->func ||
!TRACE_FRAME_IS_LAST_SEND_BY_VAL(JIT_G(current_frame)->call)) {
return 0;
}
/* break missing intentionally */
case ZEND_FETCH_DIM_R:
case ZEND_FETCH_DIM_IS:
return 1;
case ZEND_ISSET_ISEMPTY_DIM_OBJ:
if (!(opline->extended_value & ZEND_ISEMPTY)) {
return 1;
}
break;
}
return 0;
}
static bool zend_jit_is_persistent_constant(zval *key, uint32_t flags)
{
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);
}
}
return c && (ZEND_CONSTANT_FLAGS(c) & CONST_PERSISTENT);
}
static zend_property_info* zend_get_known_property_info(const zend_op_array *op_array, zend_class_entry *ce, zend_string *member, bool on_this, zend_string *filename)
{
zend_property_info *info = NULL;
if ((on_this && (op_array->fn_flags & ZEND_ACC_TRAIT_CLONE)) ||
!ce ||
!(ce->ce_flags & ZEND_ACC_LINKED) ||
(ce->ce_flags & ZEND_ACC_TRAIT) ||
ce->create_object) {
return NULL;
}
if (!(ce->ce_flags & ZEND_ACC_IMMUTABLE)) {
if (ce->info.user.filename != filename) {
/* class declaration might be changed independently */
return NULL;
}
if (ce->parent) {
zend_class_entry *parent = ce->parent;
do {
if (parent->type == ZEND_INTERNAL_CLASS) {
break;
} else if (parent->info.user.filename != filename) {
/* some of parents class declarations might be changed independently */
/* TODO: this check may be not enough, because even
* in the same it's possible to conditionally define
* few classes with the same name, and "parent" may
* change from request to request.
*/
return NULL;
}
parent = parent->parent;
} while (parent);
}
}
// TODO: Treat property hooks more precisely.
info = (zend_property_info*)zend_hash_find_ptr(&ce->properties_info, member);
if (info == NULL ||
!IS_VALID_PROPERTY_OFFSET(info->offset) ||
(info->flags & ZEND_ACC_STATIC) ||
info->hooks) {
return NULL;
}
if (info->flags & ZEND_ACC_PUBLIC) {
return info;
} else if (on_this) {
if (ce == info->ce) {
if (ce == op_array->scope) {
return info;
} else {
return NULL;
}
} else if ((info->flags & ZEND_ACC_PROTECTED)
&& instanceof_function_slow(ce, info->ce)) {
return info;
}
}
return NULL;
}
static bool zend_may_be_dynamic_property(zend_class_entry *ce, zend_string *member, bool on_this, zend_string *filename)
{
zend_property_info *info;
if (!ce || (ce->ce_flags & ZEND_ACC_TRAIT)) {
return 1;
}
if (!(ce->ce_flags & ZEND_ACC_IMMUTABLE)) {
if (ce->info.user.filename != filename) {
/* class declaration might be changed independently */
return 1;
}
}
// TODO: Treat property hooks more precisely.
info = (zend_property_info*)zend_hash_find_ptr(&ce->properties_info, member);
if (info == NULL ||
!IS_VALID_PROPERTY_OFFSET(info->offset) ||
(info->flags & ZEND_ACC_STATIC) ||
info->hooks) {
return 1;
}
if (!(info->flags & ZEND_ACC_PUBLIC) &&
(!on_this || info->ce != ce)) {
return 1;
}
return 0;
}
#define OP_RANGE(ssa_op, opN) \
(((opline->opN##_type & (IS_TMP_VAR|IS_VAR|IS_CV)) && \
ssa->var_info && \
(ssa_op)->opN##_use >= 0 && \
ssa->var_info[(ssa_op)->opN##_use].has_range) ? \
&ssa->var_info[(ssa_op)->opN##_use].range : NULL)
#define OP1_RANGE() OP_RANGE(ssa_op, op1)
#define OP2_RANGE() OP_RANGE(ssa_op, op2)
#define OP1_DATA_RANGE() OP_RANGE(ssa_op + 1, op1)
#include "jit/zend_jit_helpers.c"
#include "Zend/zend_cpuinfo.h"
#ifdef HAVE_GCC_GLOBAL_REGS
# define GCC_GLOBAL_REGS 1
#else
# define GCC_GLOBAL_REGS 0
#endif
/* By default avoid JITing inline handlers if it does not seem profitable due to lack of
* type information. Disabling this option allows testing some JIT handlers in the
* presence of try/catch blocks, which prevent SSA construction. */
#ifndef PROFITABILITY_CHECKS
# define PROFITABILITY_CHECKS 1
#endif
#define BP_JIT_IS 6 /* Used for ISSET_ISEMPTY_DIM_OBJ. see BP_VAR_*defines in Zend/zend_compile.h */
/* The generated code may contain tautological comparisons, ignore them. */
#if defined(__clang__)
# pragma clang diagnostic push
# pragma clang diagnostic ignored "-Wtautological-compare"
# pragma clang diagnostic ignored "-Wstring-compare"
#endif
#include "jit/zend_jit_ir.c"
#if defined(__clang__)
# pragma clang diagnostic pop
#endif
#ifdef _WIN32
# include <Windows.h>
#else
# include <sys/mman.h>
# if !defined(MAP_ANONYMOUS) && defined(MAP_ANON)
# define MAP_ANONYMOUS MAP_ANON
# endif
#endif
ZEND_EXT_API void zend_jit_status(zval *ret)
{
zval stats;
array_init(&stats);
add_assoc_bool(&stats, "enabled", JIT_G(enabled));
add_assoc_bool(&stats, "on", JIT_G(on));
add_assoc_long(&stats, "kind", JIT_G(trigger));
add_assoc_long(&stats, "opt_level", JIT_G(opt_level));
add_assoc_long(&stats, "opt_flags", JIT_G(opt_flags));
if (dasm_buf) {
add_assoc_long(&stats, "buffer_size", (char*)dasm_end - (char*)dasm_buf);
add_assoc_long(&stats, "buffer_free", (char*)dasm_end - (char*)*dasm_ptr);
} else {
add_assoc_long(&stats, "buffer_size", 0);
add_assoc_long(&stats, "buffer_free", 0);
}
add_assoc_zval(ret, "jit", &stats);
}
static zend_string *zend_jit_func_name(const zend_op_array *op_array)
{
smart_str buf = {0};
if (op_array->function_name) {
smart_str_appends(&buf, JIT_PREFIX);
if (op_array->scope) {
smart_str_appendl(&buf, ZSTR_VAL(op_array->scope->name), ZSTR_LEN(op_array->scope->name));
smart_str_appends(&buf, "::");
}
smart_str_appendl(&buf, ZSTR_VAL(op_array->function_name), ZSTR_LEN(op_array->function_name));
if (op_array->fn_flags & ZEND_ACC_CLOSURE) {
smart_str_appends(&buf, ":");
smart_str_appendl(&buf, ZSTR_VAL(op_array->filename), ZSTR_LEN(op_array->filename));
smart_str_appends(&buf, ":");
smart_str_append_long(&buf, op_array->line_start);
}
smart_str_0(&buf);
return buf.s;
} else if (op_array->filename) {
smart_str_appends(&buf, JIT_PREFIX);
smart_str_appendl(&buf, ZSTR_VAL(op_array->filename), ZSTR_LEN(op_array->filename));
smart_str_0(&buf);
return buf.s;
} else {
return NULL;
}
}
static int zend_may_overflow(const zend_op *opline, const zend_ssa_op *ssa_op, const zend_op_array *op_array, zend_ssa *ssa)
{
int res;
zend_long op1_min, op1_max, op2_min, op2_max;
if (!ssa->ops || !ssa->var_info) {
return 1;
}
switch (opline->opcode) {
case ZEND_PRE_INC:
case ZEND_POST_INC:
res = ssa_op->op1_def;
if (res < 0
|| !ssa->var_info[res].has_range
|| ssa->var_info[res].range.overflow) {
if (!OP1_HAS_RANGE()) {
return 1;
}
op1_max = OP1_MAX_RANGE();
if (op1_max == ZEND_LONG_MAX) {
return 1;
}
}
return 0;
case ZEND_PRE_DEC:
case ZEND_POST_DEC:
res = ssa_op->op1_def;
if (res < 0
|| !ssa->var_info[res].has_range
|| ssa->var_info[res].range.underflow) {
if (!OP1_HAS_RANGE()) {
return 1;
}
op1_min = OP1_MIN_RANGE();
if (op1_min == ZEND_LONG_MIN) {
return 1;
}
}
return 0;
case ZEND_ADD:
res = ssa_op->result_def;
if (res < 0
|| !ssa->var_info[res].has_range
|| ssa->var_info[res].range.underflow) {
if (!OP1_HAS_RANGE() || !OP2_HAS_RANGE()) {
return 1;
}
op1_min = OP1_MIN_RANGE();
op2_min = OP2_MIN_RANGE();
if (zend_add_will_overflow(op1_min, op2_min)) {
return 1;
}
}
if (res < 0
|| !ssa->var_info[res].has_range
|| ssa->var_info[res].range.overflow) {
if (!OP1_HAS_RANGE() || !OP2_HAS_RANGE()) {
return 1;
}
op1_max = OP1_MAX_RANGE();
op2_max = OP2_MAX_RANGE();
if (zend_add_will_overflow(op1_max, op2_max)) {
return 1;
}
}
return 0;
case ZEND_SUB:
res = ssa_op->result_def;
if (res < 0
|| !ssa->var_info[res].has_range
|| ssa->var_info[res].range.underflow) {
if (!OP1_HAS_RANGE() || !OP2_HAS_RANGE()) {
return 1;
}
op1_min = OP1_MIN_RANGE();
op2_max = OP2_MAX_RANGE();
if (zend_sub_will_overflow(op1_min, op2_max)) {
return 1;
}
}
if (res < 0
|| !ssa->var_info[res].has_range
|| ssa->var_info[res].range.overflow) {
if (!OP1_HAS_RANGE() || !OP2_HAS_RANGE()) {
return 1;
}
op1_max = OP1_MAX_RANGE();
op2_min = OP2_MIN_RANGE();
if (zend_sub_will_overflow(op1_max, op2_min)) {
return 1;
}
}
return 0;
case ZEND_MUL:
res = ssa_op->result_def;
return (res < 0 ||
!ssa->var_info[res].has_range ||
ssa->var_info[res].range.underflow ||
ssa->var_info[res].range.overflow);
case ZEND_ASSIGN_OP:
if (opline->extended_value == ZEND_ADD) {
res = ssa_op->op1_def;
if (res < 0
|| !ssa->var_info[res].has_range
|| ssa->var_info[res].range.underflow) {
if (!OP1_HAS_RANGE() || !OP2_HAS_RANGE()) {
return 1;
}
op1_min = OP1_MIN_RANGE();
op2_min = OP2_MIN_RANGE();
if (zend_add_will_overflow(op1_min, op2_min)) {
return 1;
}
}
if (res < 0
|| !ssa->var_info[res].has_range
|| ssa->var_info[res].range.overflow) {
if (!OP1_HAS_RANGE() || !OP2_HAS_RANGE()) {
return 1;
}
op1_max = OP1_MAX_RANGE();
op2_max = OP2_MAX_RANGE();
if (zend_add_will_overflow(op1_max, op2_max)) {
return 1;
}
}
return 0;
} else if (opline->extended_value == ZEND_SUB) {
res = ssa_op->op1_def;
if (res < 0
|| !ssa->var_info[res].has_range
|| ssa->var_info[res].range.underflow) {
if (!OP1_HAS_RANGE() || !OP2_HAS_RANGE()) {
return 1;
}
op1_min = OP1_MIN_RANGE();
op2_max = OP2_MAX_RANGE();
if (zend_sub_will_overflow(op1_min, op2_max)) {
return 1;
}
}
if (res < 0
|| !ssa->var_info[res].has_range
|| ssa->var_info[res].range.overflow) {
if (!OP1_HAS_RANGE() || !OP2_HAS_RANGE()) {
return 1;
}
op1_max = OP1_MAX_RANGE();
op2_min = OP2_MIN_RANGE();
if (zend_sub_will_overflow(op1_max, op2_min)) {
return 1;
}
}
return 0;
} else if (opline->extended_value == ZEND_MUL) {
res = ssa_op->op1_def;
return (res < 0 ||
!ssa->var_info[res].has_range ||
ssa->var_info[res].range.underflow ||
ssa->var_info[res].range.overflow);
}
ZEND_FALLTHROUGH;
default:
return 1;
}
}
static int zend_jit_build_cfg(const zend_op_array *op_array, zend_cfg *cfg)
{
uint32_t flags;
flags = ZEND_CFG_STACKLESS | ZEND_CFG_NO_ENTRY_PREDECESSORS | ZEND_SSA_RC_INFERENCE_FLAG | ZEND_SSA_USE_CV_RESULTS | ZEND_CFG_RECV_ENTRY;
zend_build_cfg(&CG(arena), op_array, flags, cfg);
/* Don't JIT huge functions. Apart from likely being detrimental due to the amount of
* generated code, some of our analysis is recursive and will stack overflow with many
* blocks. */
if (cfg->blocks_count > 100000) {
return FAILURE;
}
zend_cfg_build_predecessors(&CG(arena), cfg);
/* Compute Dominators Tree */
zend_cfg_compute_dominators_tree(op_array, cfg);
/* Identify reducible and irreducible loops */
zend_cfg_identify_loops(op_array, cfg);
return SUCCESS;
}
static int zend_jit_op_array_analyze1(const zend_op_array *op_array, zend_script *script, zend_ssa *ssa)
{
if (zend_jit_build_cfg(op_array, &ssa->cfg) != SUCCESS) {
return FAILURE;
}
#if 0
/* TODO: debugger and profiler supports? */
if ((ssa->cfg.flags & ZEND_FUNC_HAS_EXTENDED_INFO)) {
return FAILURE;
}
#endif
/* TODO: move this to zend_cfg.c ? */
if (!op_array->function_name) {
ssa->cfg.flags |= ZEND_FUNC_INDIRECT_VAR_ACCESS;
}
if ((JIT_G(opt_level) >= ZEND_JIT_LEVEL_OPT_FUNC)
&& ssa->cfg.blocks
&& op_array->last_try_catch == 0
&& !(op_array->fn_flags & ZEND_ACC_GENERATOR)
&& !(ssa->cfg.flags & ZEND_FUNC_INDIRECT_VAR_ACCESS)) {
if (zend_build_ssa(&CG(arena), script, op_array, ZEND_SSA_RC_INFERENCE | ZEND_SSA_USE_CV_RESULTS, ssa) != SUCCESS) {
return FAILURE;
}
zend_ssa_compute_use_def_chains(&CG(arena), op_array, ssa);
zend_ssa_find_false_dependencies(op_array, ssa);
zend_ssa_find_sccs(op_array, ssa);
}
return SUCCESS;
}
static int zend_jit_op_array_analyze2(const zend_op_array *op_array, zend_script *script, zend_ssa *ssa, uint32_t optimization_level)
{
if ((JIT_G(opt_level) >= ZEND_JIT_LEVEL_OPT_FUNC)
&& ssa->cfg.blocks
&& op_array->last_try_catch == 0
&& !(op_array->fn_flags & ZEND_ACC_GENERATOR)
&& !(ssa->cfg.flags & ZEND_FUNC_INDIRECT_VAR_ACCESS)) {
if (zend_ssa_inference(&CG(arena), op_array, script, ssa,
optimization_level & ~ZEND_OPTIMIZER_NARROW_TO_DOUBLE) != SUCCESS) {
return FAILURE;
}
}
return SUCCESS;