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optimize.c
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optimize.c
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/*
+----------------------------------------------------------------------+
| eAccelerator project |
+----------------------------------------------------------------------+
| Copyright (c) 2004 - 2012 eAccelerator |
| http://eaccelerator.net |
+----------------------------------------------------------------------+
| This program is free software; you can redistribute it and/or |
| modify it under the terms of the GNU General Public License |
| as published by the Free Software Foundation; either version 2 |
| of the License, or (at your option) any later version. |
| |
| This program is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this program; if not, write to the Free Software |
| Foundation, Inc., 59 Temple Place - Suite 330, Boston, |
| MA 02111-1307, USA. |
| |
| A copy is availble at http://www.gnu.org/copyleft/gpl.txt |
+----------------------------------------------------------------------+
$Id: $
*/
#include "eaccelerator.h"
#ifdef HAVE_EACCELERATOR
#ifdef WITH_EACCELERATOR_OPTIMIZER
#include "zend.h"
#include "zend_API.h"
#include "zend_constants.h"
#ifdef ZEND_ENGINE_2_4
#include "zend_string.h"
#endif
#include "opcodes.h"
#include "debug.h"
typedef unsigned int* set;
struct _BBlink;
typedef struct _BB {
zend_op* start;
unsigned int len;
zend_bool used;
zend_bool protect_merge;
struct _BB* jmp_1;
struct _BB* jmp_2;
struct _BB* jmp_ext;
struct _BB* jmp_tc;
struct _BB* follow;
struct _BBlink* pred; // Gonna be a chain of BBs
struct _BB* next;
} BB;
typedef struct _BBlink {
struct _BB* bb;
struct _BBlink* next;
} BBlink;
#ifdef DEBUG
static void dump_bb(BB* bb, zend_op_array *op_array)
{
BB* p = bb;
BBlink *q;
DBG(ea_debug_printf, (EA_DEBUG, "=== CFG FOR %s:%s ===\n", op_array->filename, op_array->function_name));
while (p) {
DBG(ea_debug_printf, (EA_DEBUG, " bb%u start=%u len=%d used=%d\n",
(unsigned int)(p-bb),
(unsigned int)(p->start-op_array->opcodes),
p->len,
p->used));
if (p->jmp_1) {
DBG(ea_debug_printf, (EA_DEBUG, " jmp_1 bb%u start=%u len=%d used=%d\n",
(unsigned int)(p->jmp_1-bb),
(unsigned int)(p->jmp_1->start-op_array->opcodes),
p->jmp_1->len,
p->jmp_1->used));
}
if (p->jmp_2) {
DBG(ea_debug_printf, (EA_DEBUG, " jmp_2 bb%u start=%u len=%d used=%d\n",
(unsigned int)(p->jmp_2-bb),
(unsigned int)(p->jmp_2->start-op_array->opcodes),
p->jmp_2->len,
p->jmp_2->used));
}
if (p->jmp_ext) {
DBG(ea_debug_printf, (EA_DEBUG, " jmp_ext bb%u start=%u len=%d used=%d\n",
(unsigned int)(p->jmp_ext-bb),
(unsigned int)(p->jmp_ext->start-op_array->opcodes),
p->jmp_ext->len,
p->jmp_ext->used));
}
if (p->jmp_tc) {
DBG(ea_debug_printf, (EA_DEBUG, " jmp_tc bb%u start=%u len=%d used=%d\n",
(unsigned int)(p->jmp_tc-bb),
(unsigned int)(p->jmp_tc->start-op_array->opcodes),
p->jmp_tc->len,
p->jmp_tc->used));
}
if (p->follow) {
DBG(ea_debug_printf, (EA_DEBUG, " follow bb%u start=%u len=%d used=%d\n",
(unsigned int)(p->follow-bb),
(unsigned int)(p->follow->start-op_array->opcodes),
p->follow->len,
p->follow->used));
}
q = p->pred;
while (q != NULL) {
DBG(ea_debug_printf, (EA_DEBUG, " pred bb%u start=%u len=%d used=%d (",
(unsigned int)(q->bb-bb),
(unsigned int)(q->bb->start-op_array->opcodes),
q->bb->len,
q->bb->used));
if (q->bb->jmp_1 == p) {
DBG(ea_debug_printf, (EA_DEBUG, "jmp_1 "));
}
if (q->bb->jmp_2 == p) {
DBG(ea_debug_printf, (EA_DEBUG, "jmp_2 "));
}
if (q->bb->jmp_ext == p) {
DBG(ea_debug_printf, (EA_DEBUG, "jmp_ext "));
}
if (q->bb->jmp_tc == p) {
DBG(ea_debug_printf, (EA_DEBUG, "jmp_tc "));
}
if (q->bb->follow == p) {
DBG(ea_debug_printf, (EA_DEBUG, "follow "));
}
DBG(ea_debug_printf, (EA_DEBUG, ")\n"));
q = q->next;
}
p = p->next;
}
DBG(ea_debug_printf, (EA_DEBUG, "=== END OF CFG ===========================\n"));
}
#endif
#ifdef ZEND_ENGINE_2_4
#define SET_TO_NOP(op) \
(op)->opcode = ZEND_NOP; \
(op)->op1_type = IS_UNUSED; \
(op)->op2_type = IS_UNUSED; \
(op)->result_type = IS_UNUSED;
#else
#define SET_TO_NOP(op) \
(op)->opcode = ZEND_NOP; \
(op)->op1.op_type = IS_UNUSED; \
(op)->op2.op_type = IS_UNUSED; \
(op)->result.op_type = IS_UNUSED;
#endif
static void compute_live_var(BB* bb, zend_op_array* op_array, char* global)
{
BB* p = bb;
char* def;
char* used;
#ifdef ZEND_ENGINE_2_3
ALLOCA_FLAG(use_heap)
#endif
memset(global, 0, op_array->T * sizeof(char));
if (p != NULL && p->next != NULL) {
int bb_count = 0;
#ifdef ZEND_ENGINE_2_3
def = do_alloca(op_array->T * sizeof(char), use_heap);
#else
def = do_alloca(op_array->T * sizeof(char));
#endif
while (p) {
zend_op* op = p->start;
zend_op* end = op + p->len;
memset(def, 0, op_array->T * sizeof(char));
while (op < end) {
if ((OP1_TYPE(op) == IS_VAR || OP1_TYPE(op) == IS_TMP_VAR) &&
!def[VAR_NUM(OP1_VARR(op))] && !global[VAR_NUM(OP1_VARR(op))]) {
global[VAR_NUM(OP1_VARR(op))] = 1;
}
if ((OP2_TYPE(op) == IS_VAR || OP2_TYPE(op) == IS_TMP_VAR) &&
!def[VAR_NUM(OP2_VARR(op))] && !global[VAR_NUM(OP2_VARR(op))]) {
if (op->opcode != ZEND_OP_DATA) {
global[VAR_NUM(OP2_VARR(op))] = 1;
}
}
#ifdef ZEND_ENGINE_2_3
if ((op->opcode == ZEND_DECLARE_INHERITED_CLASS || op->opcode == ZEND_DECLARE_INHERITED_CLASS_DELAYED) &&
#else
if (op->opcode == ZEND_DECLARE_INHERITED_CLASS &&
#endif
!def[VAR_NUM(op->extended_value)] &&
!global[VAR_NUM(op->extended_value)]) {
global[VAR_NUM(op->extended_value)] = 1;
}
if ((RES_TYPE(op) & IS_VAR &&
(op->opcode == ZEND_RECV || op->opcode == ZEND_RECV_INIT ||
(RES_USED(op) & EXT_TYPE_UNUSED) == 0)) ||
(RES_TYPE(op) & IS_TMP_VAR)) {
if (!def[VAR_NUM(RES_VARR(op))] && !global[VAR_NUM(RES_VARR(op))]) {
switch (op->opcode) {
case ZEND_RECV:
case ZEND_RECV_INIT:
case ZEND_ADD_ARRAY_ELEMENT:
global[VAR_NUM(RES_VARR(op))] = 1;
break;
}
}
def[VAR_NUM(RES_VARR(op))] = 1;
}
op++;
}
p = p->next;
bb_count++;
}
#ifdef ZEND_ENGINE_2_3
free_alloca(def, use_heap);
#else
free_alloca(def);
#endif
}
#ifdef ZEND_ENGINE_2_3
used = do_alloca(op_array->T * sizeof(char), use_heap);
#else
used = do_alloca(op_array->T * sizeof(char));
#endif
p = bb;
while (p) {
zend_op* op = p->start;
zend_op* end = op + p->len;
memset(used, 0, op_array->T * sizeof(char));
while (op < end) {
end--;
if (((RES_TYPE(end) & IS_VAR &&
(end->opcode == ZEND_RECV || end->opcode == ZEND_RECV_INIT ||
(RES_USED(end) & EXT_TYPE_UNUSED) == 0)) ||
(RES_TYPE(end) & IS_TMP_VAR)) &&
!global[VAR_NUM(RES_VARR(end))] && !used[VAR_NUM(RES_VARR(end))]) {
switch(end->opcode) {
case ZEND_JMPZ_EX:
end->opcode = ZEND_JMPZ;
RES_TYPE(end) = IS_UNUSED;
break;
case ZEND_JMPNZ_EX:
end->opcode = ZEND_JMPNZ;
RES_TYPE(end) = IS_UNUSED;
break;
case ZEND_ASSIGN_ADD:
case ZEND_ASSIGN_SUB:
case ZEND_ASSIGN_MUL:
case ZEND_ASSIGN_DIV:
case ZEND_ASSIGN_MOD:
case ZEND_ASSIGN_SL:
case ZEND_ASSIGN_SR:
case ZEND_ASSIGN_CONCAT:
case ZEND_ASSIGN_BW_OR:
case ZEND_ASSIGN_BW_AND:
case ZEND_ASSIGN_BW_XOR:
case ZEND_PRE_INC:
case ZEND_PRE_DEC:
case ZEND_POST_INC:
case ZEND_POST_DEC:
case ZEND_ASSIGN:
case ZEND_ASSIGN_REF:
case ZEND_DO_FCALL:
case ZEND_DO_FCALL_BY_NAME:
if (RES_TYPE(end) & IS_VAR) {
RES_USED(end) |= EXT_TYPE_UNUSED;
}
break;
case ZEND_UNSET_VAR:
case ZEND_UNSET_DIM:
case ZEND_UNSET_OBJ:
RES_TYPE(end) = IS_UNUSED;
break;
case ZEND_RECV:
case ZEND_RECV_INIT:
case ZEND_INCLUDE_OR_EVAL:
case ZEND_NEW:
case ZEND_FE_FETCH:
case ZEND_PRINT:
case ZEND_INIT_METHOD_CALL:
case ZEND_INIT_STATIC_METHOD_CALL:
case ZEND_ASSIGN_DIM:
case ZEND_ASSIGN_OBJ:
case ZEND_DECLARE_CLASS:
case ZEND_DECLARE_INHERITED_CLASS:
#ifdef ZEND_DECLARE_INHERITED_CLASS_DELAYED
case ZEND_DECLARE_INHERITED_CLASS_DELAYED:
#endif
break;
default:
#ifndef ZEND_ENGINE_2_4
/* TODO: check this */
if (OP1_TYPE(end) == IS_CONST) {
zval_dtor(&end->op1.u.constant);
}
if (OP2_TYPE(end) == IS_CONST) {
zval_dtor(&end->op2.u.constant);
}
#endif
SET_TO_NOP(end);
}
} else if (RES_TYPE(end) & IS_VAR &&
(RES_USED(end) & EXT_TYPE_UNUSED) != 0 &&
end->opcode != ZEND_RECV && end->opcode != ZEND_RECV_INIT &&
used[VAR_NUM(RES_VARR(end))]) {
RES_USED(end) &= ~EXT_TYPE_UNUSED;
}
if ((RES_TYPE(end) & IS_VAR &&
(end->opcode == ZEND_RECV || end->opcode == ZEND_RECV_INIT ||
(RES_USED(end) & EXT_TYPE_UNUSED) == 0)) ||
(RES_TYPE(end) & IS_TMP_VAR)) {
switch (end->opcode) {
case ZEND_RECV:
case ZEND_RECV_INIT:
case ZEND_ADD_ARRAY_ELEMENT:
used[VAR_NUM(RES_VARR(end))] = 1;
break;
default:
used[VAR_NUM(RES_VARR(end))] = 0;
}
}
if (OP1_TYPE(end) == IS_VAR || OP1_TYPE(end) == IS_TMP_VAR) {
used[VAR_NUM(OP1_VARR(end))] = 1;
}
if (OP2_TYPE(end) == IS_VAR || OP2_TYPE(end) == IS_TMP_VAR) {
used[VAR_NUM(OP2_VARR(end))] = 1;
}
#ifdef ZEND_ENGINE_2_3
if (end->opcode == ZEND_DECLARE_INHERITED_CLASS || end->opcode == ZEND_DECLARE_INHERITED_CLASS_DELAYED) {
#else
if (end->opcode == ZEND_DECLARE_INHERITED_CLASS) {
#endif
used[VAR_NUM(end->extended_value)] = 1;
}
}
p = p->next;
}
#ifdef ZEND_ENGINE_2_3
free_alloca(used, use_heap);
#else
free_alloca(used);
#endif
}
/* Adds FROM as predecessor of TO */
#define BB_ADD_PRED(TO,FROM) { \
BBlink *q = (TO)->pred; \
while (q != NULL) { \
if (q->bb == (FROM)) break; \
q = q->next; \
} \
if (q == NULL) { \
q = emalloc(sizeof(*q)); \
q->bb = (FROM); \
q->next = (TO)->pred; \
(TO)->pred = q; \
} \
}
/* Removes FROM from predecessors of TO */
#define BB_DEL_PRED(TO,FROM) { \
BBlink *q = (TO)->pred; \
if (q != NULL) { \
if (q->bb == (FROM)) { \
(TO)->pred = q->next; \
efree(q); \
} else { \
while (q->next != NULL) { \
if (q->next->bb == (FROM)) { \
BBlink *r = q->next; \
q->next = q->next->next; \
efree(r); \
break; \
} \
q = q->next; \
} \
} \
} \
}
#define RM_BB(p) do {if (p->pred == NULL && p != bb) rm_bb(p);} while (0)
static void mark_used_bb(BB* bb)
{
if (bb->used) {
return;
}
bb->used = 1;
if (bb->jmp_1 != NULL) {
mark_used_bb(bb->jmp_1);
BB_ADD_PRED(bb->jmp_1, bb);
}
if (bb->jmp_2 != NULL) {
mark_used_bb(bb->jmp_2);
BB_ADD_PRED(bb->jmp_2, bb);
}
if (bb->jmp_ext != NULL) {
mark_used_bb(bb->jmp_ext);
BB_ADD_PRED(bb->jmp_ext, bb);
}
if (bb->jmp_tc != NULL) {
mark_used_bb(bb->jmp_tc);
BB_ADD_PRED(bb->jmp_tc, bb);
}
if (bb->follow != NULL) {
mark_used_bb(bb->follow);
BB_ADD_PRED(bb->follow, bb);
}
}
static void mark_used_bb2(BB* bb)
{
if (bb->used) {
return;
}
bb->used = 1;
if (bb->jmp_1 != NULL) {
mark_used_bb2(bb->jmp_1);
}
if (bb->jmp_2 != NULL) {
mark_used_bb2(bb->jmp_2);
}
if (bb->jmp_ext != NULL) {
mark_used_bb2(bb->jmp_ext);
}
if (bb->jmp_tc != NULL) {
mark_used_bb2(bb->jmp_tc);
}
if (bb->follow != NULL) {
mark_used_bb2(bb->follow);
}
}
static void rm_bb(BB* bb)
{
if (!bb->used) {
return;
}
bb->used = 0;
if (bb->jmp_1 != NULL) {
BB_DEL_PRED(bb->jmp_1, bb);
}
if (bb->jmp_2 != NULL) {
BB_DEL_PRED(bb->jmp_2, bb);
}
if (bb->jmp_ext != NULL) {
BB_DEL_PRED(bb->jmp_ext, bb);
}
if (bb->jmp_tc != NULL) {
BB_DEL_PRED(bb->jmp_tc, bb);
}
if (bb->follow != NULL) {
BB_DEL_PRED(bb->follow, bb);
}
}
static void del_bb(BB* bb)
{
zend_op* op = bb->start;
zend_op* end = op + bb->len;
rm_bb(bb);
while (op < end) {
--end;
#ifndef ZEND_ENGINE_2_4
if (OP1_TYPE(end) == IS_CONST) {
zval_dtor(&end->op1.u.constant);
}
if (OP2_TYPE(end) == IS_CONST) {
zval_dtor(&end->op2.u.constant);
}
#endif
SET_TO_NOP(end);
}
bb->len = 0;
bb->used = 0;
}
/*
static void replace_bb(BB* src, BB* dst)
{
BBlink* p = src->pred;
while (p != NULL) {
BBlink* q = p->next;
if (p->bb->jmp_1 == src) {
p->bb->jmp_1 = dst;
BB_ADD_PRED(dst,p->bb);
}
if (p->bb->jmp_2 == src) {
p->bb->jmp_2 = dst;
BB_ADD_PRED(dst,p->bb);
}
if (p->bb->jmp_ext == src) {
p->bb->jmp_ext = dst;
BB_ADD_PRED(dst,p->bb);
}
if (p->bb->follow == src) {
p->bb->follow = dst;
BB_ADD_PRED(dst,p->bb);
}
efree(p);
p = q;
}
src->pred = NULL;
}
*/
static void optimize_jmp(BB* bb, zend_op_array* op_array)
{
BB* p;
while(1) {
int ok = 1;
/* Remove Unused Basic Blocks */
p = bb;
while (p->next != NULL) {
if (p->next->used && p->next->pred) {
p = p->next;
} else {
del_bb(p->next);
p->next = p->next->next;
ok = 0;
}
}
/* JMP optimization */
p = bb;
while (p) {
while (p->next != NULL && (!p->next->used || p->next->pred == NULL)) {
del_bb(p->next);
p->next = p->next->next;
ok = 0;
}
if (p->used && p->len > 0) {
zend_op* op = &p->start[p->len-1];
switch (op->opcode) {
case ZEND_JMP:
jmp:
/* L1: JMP L1+1 => NOP
*/
if (p->jmp_1 == p->next) {
if (p->follow) {
BB_DEL_PRED(p->follow, p);
}
p->follow = p->jmp_1;
p->jmp_1 = NULL;
SET_TO_NOP(op);
--(p->len);
ok = 0;
break;
}
/* JMP L1 => JMP L2
... ...
L1: JMP L2 JMP L2
*/
while (p->jmp_1->len == 1 &&
p->jmp_1->start->opcode == ZEND_JMP &&
p->jmp_1 != p) {
BB* x_p = p->jmp_1;
BB_DEL_PRED(p->jmp_1, p);
RM_BB(x_p);
p->jmp_1 = x_p->jmp_1;
BB_ADD_PRED(p->jmp_1, p);
ok = 0;
}
break;
case ZEND_JMPZNZ:
jmp_znz:
/* JMPZNZ ?,L1,L1 => JMP L1
*/
if (p->jmp_ext == p->jmp_2) {
op->opcode = ZEND_JMP;
op->extended_value = 0;
OP1_TYPE(op) = IS_UNUSED;
OP2_TYPE(op) = IS_UNUSED;
p->jmp_1 = p->jmp_2;
p->jmp_2 = NULL;
p->jmp_ext = NULL;
ok = 0;
goto jmp;
} else if (OP1_TYPE(op) == IS_CONST) {
/* JMPZNZ 0,L1,L2 => JMP L1
*/
if (!zend_is_true(&OP1_CONST(op))) {
op->opcode = ZEND_JMP;
op->extended_value = 0;
OP1_TYPE(op) = IS_UNUSED;
OP2_TYPE(op) = IS_UNUSED;
if (p->jmp_ext != p->jmp_2) {
BB_DEL_PRED(p->jmp_ext, p);
RM_BB(p->jmp_ext);
}
p->jmp_1 = p->jmp_2;
p->jmp_2 = NULL;
p->jmp_ext = NULL;
p->follow = NULL;
ok = 0;
goto jmp;
/* JMPZNZ 1,L1,L2 => JMP L2
*/
} else {
op->opcode = ZEND_JMP;
op->extended_value = 0;
OP1_TYPE(op) = IS_UNUSED;
OP2_TYPE(op) = IS_UNUSED;
if (p->jmp_ext != p->jmp_2) {
BB_DEL_PRED(p->jmp_2, p);
RM_BB(p->jmp_2);
}
p->jmp_1 = p->jmp_ext;
p->jmp_2 = NULL;
p->jmp_ext = NULL;
p->follow = NULL;
ok = 0;
goto jmp;
}
/* L1: JMPZNZ ?,L2,L1+1 => JMPZ ?,L2
*/
} else if (p->jmp_ext == p->next) {
op->opcode = ZEND_JMPZ;
op->extended_value = 0;
p->follow = p->jmp_ext;
p->jmp_ext = NULL;
ok = 0;
goto jmp_z;
/* L1: JMPZNZ ?,L1+1,L2 => JMPNZ ?,L2
*/
} else if (p->jmp_2 == p->next) {
op->opcode = ZEND_JMPNZ;
op->extended_value = 0;
p->follow = p->jmp_2;
p->jmp_2 = p->jmp_ext;
p->jmp_ext = NULL;
ok = 0;
goto jmp_nz;
} else if (p->jmp_2->len == 1 &&
OP1_TYPE(op) == IS_TMP_VAR) {
/* JMPZNZ $x,L1,L2 => JMPZNZ $x,L3,L2
... ...
L1: JMPZ $x,L3 JMPZ $x,L3
*/
/* JMPZNZ $x,L1,L2 => JMPZNZ $x,L3,L2
... ...
L1: JMPZNZ $x,L3,L4 JMPZNZ $x,L3,L4
*/
if ((p->jmp_2->start->opcode == ZEND_JMPZ ||
p->jmp_2->start->opcode == ZEND_JMPZNZ) &&
OP1_TYPE(p->jmp_2->start) == IS_TMP_VAR &&
OP1_VARR(op) == OP1_VARR(p->jmp_2->start)) {
if (p->jmp_2 != p->jmp_ext) {
BB_DEL_PRED(p->jmp_2, p);
RM_BB(p->jmp_2);
}
p->jmp_2 = p->jmp_2->jmp_2;
BB_ADD_PRED(p->jmp_2, p);
ok = 0;
goto jmp_znz;
/* JMPZNZ $x,L1,L2 => JMPZNZ $x,L1+1,L2
... ...
L1: JMPNZ $x,L3 JMPNZ $x,L3
*/
} else if (p->jmp_2->start->opcode == ZEND_JMPNZ &&
OP1_TYPE(p->jmp_2->start) == IS_TMP_VAR &&
OP1_VARR(op) == OP1_VARR(p->jmp_2->start)) {
if (p->jmp_2 != p->jmp_ext) {
BB_DEL_PRED(p->jmp_2, p);
RM_BB(p->jmp_2);
}
p->jmp_2 = p->jmp_2->follow;
BB_ADD_PRED(p->jmp_2, p);
ok = 0;
goto jmp_znz;
/* JMPZNZ $x,L1,L2 => JMPZNZ $x,L1,L3
... ...
L2: JMPNZ $x,L3 JMPNZ $x,L3
*/
} else if (p->jmp_ext->start->opcode == ZEND_JMPNZ &&
OP1_TYPE(p->jmp_ext->start) == IS_TMP_VAR &&
OP1_VARR(op) == OP1_VARR(p->jmp_ext->start)) {
if (p->jmp_2 != p->jmp_ext) {
BB_DEL_PRED(p->jmp_ext, p);
RM_BB(p->jmp_ext);
}
p->jmp_ext = p->jmp_ext->jmp_2;
BB_ADD_PRED(p->jmp_ext, p);
ok = 0;
goto jmp_znz;
/* JMPZNZ $x,L1,L2 => JMPZNZ $x,L1,L4
... ...
L2: JMPZNZ $x,L3,L4 JMPZNZ $x,L3,L4
*/
} else if (p->jmp_ext->start->opcode == ZEND_JMPZNZ &&
OP1_TYPE(p->jmp_ext->start) == IS_TMP_VAR &&
OP1_VARR(op) == OP1_VARR(p->jmp_ext->start)) {
if (p->jmp_2 != p->jmp_ext) {
BB_DEL_PRED(p->jmp_ext, p);
RM_BB(p->jmp_ext);
}
p->jmp_ext = p->jmp_ext->jmp_ext;
BB_ADD_PRED(p->jmp_ext, p);
ok = 0;
goto jmp_znz;
/* JMPZNZ $x,L1,L2 => JMPZNZ $x,L1,L2+1
... ...
L2: JMPZ $x,L3 JMPZ $x,L3
*/
} else if (p->jmp_ext->start->opcode == ZEND_JMPZ &&
OP1_TYPE(p->jmp_ext->start) == IS_TMP_VAR &&
OP1_VARR(op) == OP1_VARR(p->jmp_ext->start)) {
if (p->jmp_2 != p->jmp_ext) {
BB_DEL_PRED(p->jmp_ext, p);
RM_BB(p->jmp_ext);
}
p->jmp_ext = p->jmp_ext->follow;
BB_ADD_PRED(p->jmp_ext, p);
ok = 0;
goto jmp_znz;
}
}
while (p->jmp_2->len == 1 && p->jmp_2->start->opcode == ZEND_JMP) {
BB* x_p = p->jmp_2;
if (p->jmp_2 != p->jmp_ext) {
BB_DEL_PRED(p->jmp_2, p);
RM_BB(x_p);
}
p->jmp_2 = x_p->jmp_1;
BB_ADD_PRED(p->jmp_2, p);
ok = 0;
}
while (p->jmp_ext->len == 1 && p->jmp_ext->start->opcode == ZEND_JMP) {
BB* x_p = p->jmp_ext;
if (p->jmp_2 != p->jmp_ext) {
BB_DEL_PRED(p->jmp_ext, p);
RM_BB(x_p);
}
p->jmp_ext = x_p->jmp_1;
BB_ADD_PRED(p->jmp_ext, p);
ok = 0;
}
break;
case ZEND_JMPZ:
jmp_z:
/* L1: JMPZ ?,L1+1 => NOP
*/
if (p->follow == p->jmp_2) {
p->jmp_2 = NULL;
SET_TO_NOP(op);
--(p->len);
ok = 0;
break;
} else if (OP1_TYPE(op) == IS_CONST) {
/* JMPZ 0,L1 => JMP L1
*/
if (!zend_is_true(&OP1_CONST(op))) {
op->opcode = ZEND_JMP;
OP1_TYPE(op) = IS_UNUSED;
OP2_TYPE(op) = IS_UNUSED;
if (p->follow != p->jmp_2) {
BB_DEL_PRED(p->follow, p);
RM_BB(p->follow);
}
p->jmp_1 = p->jmp_2;
p->jmp_2 = NULL;
p->follow = NULL;
ok = 0;
goto jmp;
/* JMPZ 1,L1 => NOP
*/
} else {
if (p->follow != p->jmp_2) {
BB_DEL_PRED(p->jmp_2, p);
RM_BB(p->jmp_2);
}
p->jmp_2 = NULL;
SET_TO_NOP(op);
--(p->len);
ok = 0;
break;
}
/* JMPZ ?,L1 => JMPZNZ ?,L1,L2
JMP L2 JMP L2
*/
} else if (p->follow->len == 1 && p->follow->start->opcode == ZEND_JMP) {
BB* x_p = p->follow;
op->opcode = ZEND_JMPZNZ;
if (p->jmp_2 != p->follow) {
BB_DEL_PRED(p->follow, p);
RM_BB(x_p);
}
p->follow = NULL;
p->jmp_ext = x_p->jmp_1;
BB_ADD_PRED(p->jmp_ext, p);
ok = 0;
goto jmp_znz;
} else if (p->jmp_2->len == 1 &&
OP1_TYPE(op) == IS_TMP_VAR) {
/* JMPZ $x,L1 => JMPZ $x,L2
... ...
L1: JMPZ $x,L2 JMPZ $x,L2
----------------------------------------
JMPZ $x,L1 => JMPZ $x,L2
... ...
L1: JMPZNZ $x,L2,L3 JMPZNZ $x,L2,L3
*/
if ((p->jmp_2->start->opcode == ZEND_JMPZ ||
p->jmp_2->start->opcode == ZEND_JMPZNZ) &&
OP1_TYPE(p->jmp_2->start) == IS_TMP_VAR &&
OP1_VARR(op) == OP1_VARR(p->jmp_2->start)) {
if (p->jmp_2 != p->follow) {
BB_DEL_PRED(p->jmp_2, p);
RM_BB(p->jmp_2);
}
p->jmp_2 = p->jmp_2->jmp_2;
BB_ADD_PRED(p->jmp_2, p);
ok = 0;
goto jmp_z;
/* JMPZ $x,L1 => JMPZ $x,L1+1
... ...
L1: JMPNZ $x,L2 JMPNZ $x,L2
*/
} else if (p->jmp_2->start->opcode == ZEND_JMPNZ &&
OP1_TYPE(p->jmp_2->start) == IS_TMP_VAR &&
OP1_VARR(op) == OP1_VARR(p->jmp_2->start)) {
if (p->jmp_2 != p->follow) {
BB_DEL_PRED(p->jmp_2, p);
RM_BB(p->jmp_2);
}
p->jmp_2 = p->jmp_2->follow;
BB_ADD_PRED(p->jmp_2, p);
ok = 0;
goto jmp_z;
}
}
goto jmp_2;
case ZEND_JMPNZ:
jmp_nz:
/* L1: JMPNZ ?,L1+1 => NOP
*/
if (p->follow == p->jmp_2) {
p->jmp_2 = NULL;
SET_TO_NOP(op);
--(p->len);
ok = 0;
break;
} else if (OP1_TYPE(op) == IS_CONST) {
/* JMPNZ 1,L1 => JMP L1
*/
if (zend_is_true(&OP1_CONST(op))) {
op->opcode = ZEND_JMP;
OP1_TYPE(op) = IS_UNUSED;
OP2_TYPE(op) = IS_UNUSED;
if (p->follow != p->jmp_2) {
BB_DEL_PRED(p->follow, p);
RM_BB(p->follow);
}
p->jmp_1 = p->jmp_2;
p->jmp_2 = NULL;
p->follow = NULL;
ok = 0;
goto jmp;
/* JMPNZ 0,L1 => NOP
*/
} else {
if (p->follow != p->jmp_2) {
BB_DEL_PRED(p->jmp_2, p);
RM_BB(p->jmp_2);
}
p->jmp_2 = NULL;
SET_TO_NOP(op);
--(p->len);
ok = 0;
break;
}
/* JMPNZ ?,L1 => JMPZNZ ?,L2,L1
JMP L2 JMP L2
*/
} else if (p->follow->len == 1 && p->follow->start->opcode == ZEND_JMP) {
BB* x_p = p->follow;
op->opcode = ZEND_JMPZNZ;
if (p->jmp_2 != p->follow) {
BB_DEL_PRED(p->follow, p);
RM_BB(p->follow);
}
p->follow = NULL;
p->jmp_ext = p->jmp_2;
p->jmp_2 = x_p->jmp_1;
BB_ADD_PRED(p->jmp_2, p);
ok = 0;
goto jmp_znz;
/* JMPNZ $x,L1 => JMPNZ $x,L2
... ...
L1: JMPNZ $x,L2 JMPNZ $x,L2
*/
} else if (p->jmp_2->len == 1 &&
OP1_TYPE(op) == IS_TMP_VAR) {
if (p->jmp_2->start->opcode == ZEND_JMPNZ &&
OP1_TYPE(p->jmp_2->start) == IS_TMP_VAR &&
OP1_VARR(op) == OP1_VARR(p->jmp_2->start)) {
if (p->jmp_2 != p->follow) {
BB_DEL_PRED(p->jmp_2, p);
RM_BB(p->jmp_2);
}
p->jmp_2 = p->jmp_2->jmp_2;
BB_ADD_PRED(p->jmp_2, p);
ok = 0;
goto jmp_nz;
/* JMPNZ $x,L1 => JMPNZ $x,L1+1
... ...
L1: JMPZ $x,L2 JMPZ $x,L2
*/
} else if (p->jmp_2->start->opcode == ZEND_JMPZ &&
OP1_TYPE(p->jmp_2->start) == IS_TMP_VAR &&
OP1_VARR(op) == OP1_VARR(p->jmp_2->start)) {
if (p->jmp_2 != p->follow) {
BB_DEL_PRED(p->jmp_2, p);
RM_BB(p->jmp_2);
}
p->jmp_2 = p->jmp_2->follow;
BB_ADD_PRED(p->jmp_2, p);
ok = 0;
goto jmp_nz;
/* JMPNZ $x,L1 => JMPNZ $x,L3
... ...
L1: JMPZNZ $x,L2,L3 JMPZNZ $x,L2,L3
*/
} else if (p->jmp_2->start->opcode == ZEND_JMPZNZ &&
OP1_TYPE(p->jmp_2->start) == IS_TMP_VAR &&
OP1_VARR(op) == OP1_VARR(p->jmp_2->start)) {
if (p->jmp_2 != p->follow) {
BB_DEL_PRED(p->jmp_2, p);
RM_BB(p->jmp_2);
}
p->jmp_2 = p->jmp_2->jmp_ext;
BB_ADD_PRED(p->jmp_2, p);
ok = 0;
goto jmp_nz;
}
}
goto jmp_2;
case ZEND_JMPZ_EX:
jmp_z_ex:
/* L1: JMPZ_EX $x,L1+1,$x => NOP
*/
if (p->follow == p->jmp_2 &&
OP1_TYPE(op) == IS_TMP_VAR &&
RES_TYPE(op) == IS_TMP_VAR &&
OP1_VARR(op) == RES_VARR(op)) {
p->jmp_2 = NULL;
SET_TO_NOP(op);
--(p->len);
ok = 0;
break;
/* L1: JMPZ_EX $x,L1+1,$y => BOOL $x,$y
*/
} else if (p->follow == p->jmp_2) {
p->jmp_2 = NULL;
op->opcode = ZEND_BOOL;
OP2_TYPE(op) = IS_UNUSED;
ok = 0;
break;
} else if (p->jmp_2->len == 1 &&
RES_TYPE(op) == IS_TMP_VAR) {
/* JMPZ_EX ?,L1,$x => JMPZ_EX ?,L2,$x
... ...
L1: JMPZ $x,L2 JMPZ $x,L2
------------------------------------------
JMPZ_EX ?,L1,$x => JMPZ_EX ?,L2,$x
... ...
L1: JMPZNZ $x,L2,L3 JMPZNZ $x,L2,L3
------------------------------------------
JMPZ_EX ?,L1,$x => JMPZ_EX ?,L2,$x
... ...
L1: JMPZ_EX $x,L2,$x JMPZ_EX $x,L2,$x
*/
if (((p->jmp_2->start->opcode == ZEND_JMPZ ||
p->jmp_2->start->opcode == ZEND_JMPZNZ) &&
OP1_TYPE(p->jmp_2->start) == IS_TMP_VAR &&
RES_VARR(op) == OP1_VARR(p->jmp_2->start)) ||
(p->jmp_2->start->opcode == ZEND_JMPZ_EX &&
OP1_TYPE(p->jmp_2->start) == IS_TMP_VAR &&
RES_TYPE(p->jmp_2->start) == IS_TMP_VAR &&
RES_VARR(op) == OP1_VARR(p->jmp_2->start) &&
RES_VARR(op) == RES_VARR(p->jmp_2->start))) {
if (p->jmp_2 != p->follow) {
BB_DEL_PRED(p->jmp_2, p);
RM_BB(p->jmp_2);
}
p->jmp_2 = p->jmp_2->jmp_2;
BB_ADD_PRED(p->jmp_2, p);