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zend_jit.c
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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: |
| 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 "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 "jit/zend_jit_x86.h"
#include "jit/zend_jit_internal.h"
#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-"
#define DASM_M_GROW(ctx, t, p, sz, need) \
do { \
size_t _sz = (sz), _need = (need); \
if (_sz < _need) { \
if (_sz < 16) _sz = 16; \
while (_sz < _need) _sz += _sz; \
(p) = (t *)erealloc((p), _sz); \
(sz) = _sz; \
} \
} while(0)
#define DASM_M_FREE(ctx, p, sz) efree(p)
#if ZEND_DEBUG
# define DASM_CHECKS 1
#endif
#include "dynasm/dasm_proto.h"
typedef struct _zend_jit_stub {
const char *name;
int (*stub)(dasm_State **Dst);
} zend_jit_stub;
#define JIT_STUB(name) \
{JIT_STUB_PREFIX #name, zend_jit_ ## name ## _stub}
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;
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 void 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_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 zend_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);
}
next_use = zend_ssa_next_use(ssa->ops, var, use);
if (next_use < 0) {
int b = ssa->cfg.map[use];
int prev_use = ssa->vars[var].use_chain;
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);
}
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 zend_bool zend_ival_is_last_use(const zend_lifetime_interval *ival, int use)
{
if (ival->flags & ZREG_LAST_USE) {
const zend_life_range *range = &ival->range;
while (range->next) {
range = range->next;
}
return range->end == use;
}
return 0;
}
static zend_bool zend_is_commutative(zend_uchar opcode)
{
return
opcode == ZEND_ADD ||
opcode == ZEND_MUL ||
opcode == ZEND_BW_OR ||
opcode == ZEND_BW_AND ||
opcode == ZEND_BW_XOR;
}
static zend_bool zend_long_is_power_of_two(zend_long x)
{
return (x > 0) && !(x & (x - 1));
}
#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 "dynasm/dasm_x86.h"
#include "jit/zend_jit_helpers.c"
#include "jit/zend_jit_disasm_x86.c"
#ifndef _WIN32
#include "jit/zend_jit_gdb.c"
#include "jit/zend_jit_perf_dump.c"
#endif
#ifdef HAVE_OPROFILE
# include "jit/zend_jit_oprofile.c"
#endif
#include "jit/zend_jit_vtune.c"
#include "jit/zend_jit_x86.c"
#if _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) {
if (op_array->scope) {
smart_str_appends(&buf, JIT_PREFIX);
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));
smart_str_0(&buf);
return buf.s;
} else {
smart_str_appends(&buf, JIT_PREFIX);
smart_str_appendl(&buf, ZSTR_VAL(op_array->function_name), ZSTR_LEN(op_array->function_name));
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;
}
}
#if ZEND_DEBUG
static void handle_dasm_error(int ret) {
switch (ret & 0xff000000u) {
case DASM_S_NOMEM:
fprintf(stderr, "DASM_S_NOMEM\n");
break;
case DASM_S_PHASE:
fprintf(stderr, "DASM_S_PHASE\n");
break;
case DASM_S_MATCH_SEC:
fprintf(stderr, "DASM_S_MATCH_SEC\n");
break;
case DASM_S_RANGE_I:
fprintf(stderr, "DASM_S_RANGE_I\n");
break;
case DASM_S_RANGE_SEC:
fprintf(stderr, "DASM_S_RANGE_SEC\n");
break;
case DASM_S_RANGE_LG:
fprintf(stderr, "DASM_S_RANGE_LG\n");
break;
case DASM_S_RANGE_PC:
fprintf(stderr, "DASM_S_RANGE_PC %d\n", ret & 0xffffffu);
break;
case DASM_S_RANGE_VREG:
fprintf(stderr, "DASM_S_RANGE_VREG\n");
break;
case DASM_S_UNDEF_L:
fprintf(stderr, "DASM_S_UNDEF_L\n");
break;
case DASM_S_UNDEF_PC:
fprintf(stderr, "DASM_S_UNDEF_PC\n");
break;
}
ZEND_UNREACHABLE();
}
#endif
static void *dasm_link_and_encode(dasm_State **dasm_state,
const zend_op_array *op_array,
zend_ssa *ssa,
const zend_op *rt_opline,
zend_lifetime_interval **ra,
const char *name,
uint32_t trace_num)
{
size_t size;
int ret;
void *entry;
#if defined(HAVE_DISASM) || defined(HAVE_GDB) || defined(HAVE_OPROFILE) || defined(HAVE_PERFTOOLS) || defined(HAVE_VTUNE)
zend_string *str = NULL;
#endif
if (rt_opline && ssa && ssa->cfg.map) {
/* Create additional entry point, to switch from interpreter to JIT-ed
* code at run-time.
*/
int b = ssa->cfg.map[rt_opline - op_array->opcodes];
//#ifdef CONTEXT_THREADED_JIT
// if (!(ssa->cfg.blocks[b].flags & (ZEND_BB_START|ZEND_BB_RECV_ENTRY))) {
//#else
if (!(ssa->cfg.blocks[b].flags & (ZEND_BB_START|ZEND_BB_ENTRY|ZEND_BB_RECV_ENTRY))) {
//#endif
zend_jit_label(dasm_state, ssa->cfg.blocks_count + b);
zend_jit_prologue(dasm_state);
if (ra) {
int i;
zend_lifetime_interval *ival;
zend_life_range *range;
uint32_t pos = rt_opline - op_array->opcodes;
for (i = 0; i < ssa->vars_count; i++) {
ival = ra[i];
if (ival && ival->reg != ZREG_NONE) {
range = &ival->range;
if (pos >= range->start && pos <= range->end) {
if (!zend_jit_load_var(dasm_state, ssa->var_info[i].type, ssa->vars[i].var, ival->reg)) {
return NULL;
}
break;
}
range = range->next;
}
}
}
zend_jit_jmp(dasm_state, b);
}
}
ret = dasm_link(dasm_state, &size);
if (ret != DASM_S_OK) {
#if ZEND_DEBUG
handle_dasm_error(ret);
#endif
return NULL;
}
if ((void*)((char*)*dasm_ptr + size) > dasm_end) {
*dasm_ptr = dasm_end; //prevent further try
// TODO: jit_buffer_size overflow ???
return NULL;
}
ret = dasm_encode(dasm_state, *dasm_ptr);
if (ret != DASM_S_OK) {
#if ZEND_DEBUG
handle_dasm_error(ret);
#endif
return NULL;
}
entry = *dasm_ptr;
*dasm_ptr = (void*)((char*)*dasm_ptr + ZEND_MM_ALIGNED_SIZE_EX(size, DASM_ALIGNMENT));
if (trace_num) {
zend_jit_trace_add_code(entry, size);
}
if (op_array && ssa) {
int b;
for (b = 0; b < ssa->cfg.blocks_count; b++) {
//#ifdef CONTEXT_THREADED_JIT
// if (ssa->cfg.blocks[b].flags & (ZEND_BB_START|ZEND_BB_RECV_ENTRY)) {
//#else
if (ssa->cfg.blocks[b].flags & (ZEND_BB_START|ZEND_BB_ENTRY|ZEND_BB_RECV_ENTRY)) {
//#endif
zend_op *opline = op_array->opcodes + ssa->cfg.blocks[b].start;
int offset = dasm_getpclabel(dasm_state, ssa->cfg.blocks_count + b);
if (offset >= 0) {
opline->handler = (void*)(((char*)entry) + offset);
}
}
}
if (rt_opline && ssa && ssa->cfg.map) {
int b = ssa->cfg.map[rt_opline - op_array->opcodes];
zend_op *opline = (zend_op*)rt_opline;
int offset = dasm_getpclabel(dasm_state, ssa->cfg.blocks_count + b);
if (offset >= 0) {
opline->handler = (void*)(((char*)entry) + offset);
}
}
}
#if defined(HAVE_DISASM) || defined(HAVE_GDB) || defined(HAVE_OPROFILE) || defined(HAVE_PERFTOOLS) || defined(HAVE_VTUNE)
if (!name) {
if (JIT_G(debug) & (ZEND_JIT_DEBUG_ASM|ZEND_JIT_DEBUG_GDB|ZEND_JIT_DEBUG_OPROFILE|ZEND_JIT_DEBUG_PERF|ZEND_JIT_DEBUG_VTUNE|ZEND_JIT_DEBUG_PERF_DUMP)) {
str = zend_jit_func_name(op_array);
if (str) {
name = ZSTR_VAL(str);
}
}
#ifdef HAVE_DISASM
if (JIT_G(debug) & ZEND_JIT_DEBUG_ASM) {
zend_jit_disasm_add_symbol(name, (uintptr_t)entry, size);
zend_jit_disasm(
name,
(op_array && op_array->filename) ? ZSTR_VAL(op_array->filename) : NULL,
op_array,
&ssa->cfg,
entry,
size);
}
} else {
if (JIT_G(debug) & (ZEND_JIT_DEBUG_ASM_STUBS|ZEND_JIT_DEBUG_ASM)) {
zend_jit_disasm_add_symbol(name, (uintptr_t)entry, size);
if ((JIT_G(debug) & (trace_num ? ZEND_JIT_DEBUG_ASM : ZEND_JIT_DEBUG_ASM_STUBS)) != 0) {
zend_jit_disasm(
name,
(op_array && op_array->filename) ? ZSTR_VAL(op_array->filename) : NULL,
op_array,
ssa ? &ssa->cfg : NULL,
entry,
size);
}
}
# endif
}
#endif
#ifdef HAVE_GDB
if (JIT_G(debug) & ZEND_JIT_DEBUG_GDB) {
if (name) {
zend_jit_gdb_register(
name,
op_array,
entry,
size);
}
}
#endif
#ifdef HAVE_OPROFILE
if (JIT_G(debug) & ZEND_JIT_DEBUG_OPROFILE) {
zend_jit_oprofile_register(
name,
entry,
size);
}
#endif
#ifdef HAVE_PERFTOOLS
if (JIT_G(debug) & (ZEND_JIT_DEBUG_PERF|ZEND_JIT_DEBUG_PERF_DUMP)) {
if (name) {
zend_jit_perf_map_register(
name,
entry,
size);
if (JIT_G(debug) & ZEND_JIT_DEBUG_PERF_DUMP) {
zend_jit_perf_jitdump_register(
name,
entry,
size);
}
}
}
#endif
#ifdef HAVE_VTUNE
if (JIT_G(debug) & ZEND_JIT_DEBUG_VTUNE) {
if (name) {
zend_jit_vtune_register(
name,
entry,
size);
}
}
#endif
#if defined(HAVE_DISASM) || defined(HAVE_GDB) || defined(HAVE_OPROFILE) || defined(HAVE_PERFTOOLS) || defined(HAVE_VTUNE)
if (str) {
zend_string_release(str);
}
#endif
return entry;
}
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);
}
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;
if (zend_build_cfg(&CG(arena), op_array, flags, cfg) != SUCCESS) {
return FAILURE;
}
/* 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;
}
if (zend_cfg_build_predecessors(&CG(arena), cfg) != SUCCESS) {
return FAILURE;
}
/* Compute Dominators Tree */
if (zend_cfg_compute_dominators_tree(op_array, cfg) != SUCCESS) {
return FAILURE;
}
/* Identify reducible and irreducible loops */
if (zend_cfg_identify_loops(op_array, cfg) != SUCCESS) {
return FAILURE;
}
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;
}
if (zend_ssa_compute_use_def_chains(&CG(arena), op_array, ssa) != SUCCESS) {
return FAILURE;
}
if (zend_ssa_find_false_dependencies(op_array, ssa) != SUCCESS) {
return FAILURE;
}
if (zend_ssa_find_sccs(op_array, ssa) != SUCCESS){
return FAILURE;
}
}
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) != SUCCESS) {
return FAILURE;
}
}
return SUCCESS;
}
static int zend_jit_add_range(zend_lifetime_interval **intervals, int var, uint32_t from, uint32_t to)
{
zend_lifetime_interval *ival = intervals[var];
if (!ival) {
ival = zend_arena_alloc(&CG(arena), sizeof(zend_lifetime_interval));
if (!ival) {
return FAILURE;
}
ival->ssa_var = var;
ival->reg = ZREG_NONE;
ival->flags = 0;
ival->range.start = from;
ival->range.end = to;
ival->range.next = NULL;
ival->hint = NULL;
ival->used_as_hint = NULL;
intervals[var] = ival;
} else if (ival->range.start > to + 1) {
zend_life_range *range = zend_arena_alloc(&CG(arena), sizeof(zend_life_range));
if (!range) {
return FAILURE;
}
range->start = ival->range.start;
range->end = ival->range.end;
range->next = ival->range.next;
ival->range.start = from;
ival->range.end = to;
ival->range.next = range;
} else if (ival->range.start == to + 1) {
ival->range.start = from;
} else {
zend_life_range *range = &ival->range;
zend_life_range *last = NULL;
do {
if (range->start > to + 1) {
break;
} else if (range->end + 1 >= from) {
if (range->start > from) {
range->start = from;
}
last = range;
range = range->next;
while (range) {
if (range->start > to + 1) {
break;
}
last->end = range->end;
range = range->next;
last->next = range;
}
if (to > last->end) {
last->end = to;
}
return SUCCESS;
}
last = range;
range = range->next;
} while (range);
range = zend_arena_alloc(&CG(arena), sizeof(zend_life_range));
if (!range) {
return FAILURE;
}
range->start = from;
range->end = to;
range->next = last->next;
last->next = range;
}
return SUCCESS;
}
static int zend_jit_begin_range(zend_lifetime_interval **intervals, int var, uint32_t block_start, uint32_t from)
{
if (block_start != from && intervals[var]) {
zend_life_range *range = &intervals[var]->range;
do {
if (from >= range->start && from <= range->end) {
if (range->start == block_start) {
range->start = from;
} else {
zend_life_range *r = zend_arena_alloc(&CG(arena), sizeof(zend_life_range));
if (!r) {
return FAILURE;
}
r->start = from;
r->end = range->end;
r->next = range->next;
range->end = block_start - 1;
range->next = r;
}
return SUCCESS;
}
range = range->next;
} while (range);
}
// dead store
return zend_jit_add_range(intervals, var, from, from);
}
static void zend_jit_insert_interval(zend_lifetime_interval **list, zend_lifetime_interval *ival)
{
while (1) {
if (*list == NULL) {
*list = ival;
ival->list_next = NULL;
return;
} else if (ival->range.start < (*list)->range.start) {
ival->list_next = *list;
*list = ival;
return;
}
list = &(*list)->list_next;
}
}
static int zend_jit_split_interval(zend_lifetime_interval *current, uint32_t pos, zend_lifetime_interval **list, zend_lifetime_interval **free)
{
zend_lifetime_interval *ival;
zend_life_range *range = ¤t->range;
zend_life_range *prev = NULL;
if (*free) {
ival = *free;
*free = ival->list_next;
} else {
ival = zend_arena_alloc(&CG(arena), sizeof(zend_lifetime_interval));
if (!ival) {
return FAILURE;
}
}
current->flags |= ZREG_STORE;
ival->ssa_var = current->ssa_var;
ival->reg = ZREG_NONE;
ival->flags |= ZREG_SPLIT | ZREG_LOAD;
ival->flags &= ~ZREG_STORE;
ival->hint = NULL;
do {
if (pos >= range->start && pos <= range->end) {
break;
}
prev = range;
range = range->next;
} while(range);
ZEND_ASSERT(range != NULL);
ival->range.start = pos;
ival->range.end = range->end;
ival->range.next = range->next;
if (pos == range->start) {
ZEND_ASSERT(prev != NULL);
prev->next = NULL;
} else {
range->end = pos - 1;
}
zend_jit_insert_interval(list, ival);
return SUCCESS;
}
static zend_lifetime_interval *zend_jit_sort_intervals(zend_lifetime_interval **intervals, int count)
{
zend_lifetime_interval *list, *last;
int i;
list = NULL;
i = 0;
while (i < count) {
list = intervals[i];
i++;
if (list) {
last = list;
last->list_next = NULL;
break;
}
}
while (i < count) {
zend_lifetime_interval *ival = intervals[i];
i++;
if (ival) {
if ((ival->range.start > last->range.start) ||
(ival->range.start == last->range.start &&
((!ival->hint && last->hint && last->hint != ival) ||
ival->range.end > last->range.end))) {
last->list_next = ival;
last = ival;
ival->list_next = NULL;
} else {
zend_lifetime_interval **p = &list;
while (1) {
if (*p == NULL) {
*p = last = ival;
ival->list_next = NULL;
break;
} else if ((ival->range.start < (*p)->range.start) ||
(ival->range.start == (*p)->range.start &&
((ival->hint && !(*p)->hint && ival->hint != *p) ||
ival->range.end < (*p)->range.end))) {
ival->list_next = *p;
*p = ival;
break;
}
p = &(*p)->list_next;
}
}
}
}