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pass3.c
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/*
+----------------------------------------------------------------------+
| Zend OPcache |
+----------------------------------------------------------------------+
| Copyright (c) 1998-2017 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 |
| [email protected] so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
| Authors: Andi Gutmans <[email protected]> |
| Zeev Suraski <[email protected]> |
| Stanislav Malyshev <[email protected]> |
| Dmitry Stogov <[email protected]> |
+----------------------------------------------------------------------+
*/
/* pass 3:
* - optimize $i = $i+expr to $i+=expr
* - optimize series of JMPs
* - change $i++ to ++$i where possible
*/
#include "php.h"
#include "Optimizer/zend_optimizer.h"
#include "Optimizer/zend_optimizer_internal.h"
#include "zend_API.h"
#include "zend_constants.h"
#include "zend_execute.h"
#include "zend_vm.h"
/* we use "jmp_hitlist" to avoid infinity loops during jmp optimization */
#define CHECK_JMP(target, label) \
for (i=0; i<jmp_hitlist_count; i++) { \
if (jmp_hitlist[i] == ZEND_OP1_JMP_ADDR(target)) { \
goto label; \
} \
} \
jmp_hitlist[jmp_hitlist_count++] = ZEND_OP1_JMP_ADDR(target);
#define CHECK_JMP2(target, label) \
for (i=0; i<jmp_hitlist_count; i++) { \
if (jmp_hitlist[i] == ZEND_OP2_JMP_ADDR(target)) { \
goto label; \
} \
} \
jmp_hitlist[jmp_hitlist_count++] = ZEND_OP2_JMP_ADDR(target);
void zend_optimizer_pass3(zend_op_array *op_array)
{
zend_op *opline;
zend_op *end = op_array->opcodes + op_array->last;
zend_op **jmp_hitlist;
int jmp_hitlist_count;
int i;
uint32_t opline_num = 0;
ALLOCA_FLAG(use_heap);
jmp_hitlist = (zend_op**)do_alloca(sizeof(zend_op*)*op_array->last, use_heap);
opline = op_array->opcodes;
while (opline < end) {
jmp_hitlist_count = 0;
switch (opline->opcode) {
case ZEND_ADD:
case ZEND_SUB:
case ZEND_MUL:
case ZEND_DIV:
case ZEND_MOD:
case ZEND_POW:
case ZEND_CONCAT:
case ZEND_SL:
case ZEND_SR:
case ZEND_BW_OR:
case ZEND_BW_AND:
case ZEND_BW_XOR:
{
zend_op *next_opline = opline + 1;
while (next_opline < end && next_opline->opcode == ZEND_NOP) {
++next_opline;
}
if (next_opline >= end || next_opline->opcode != ZEND_ASSIGN) {
break;
}
if ((opline->op2_type & (IS_VAR | IS_CV))
&& opline->op2.var == next_opline->op1.var &&
(opline->opcode == ZEND_ADD ||
opline->opcode == ZEND_MUL ||
opline->opcode == ZEND_BW_OR ||
opline->opcode == ZEND_BW_AND ||
opline->opcode == ZEND_BW_XOR)) {
/* change $i=expr+$i to $i=$i+expr so that the next
* optimization works on it
*/
zend_uchar tmp_type = opline->op1_type;
znode_op tmp = opline->op1;
if (opline->opcode != ZEND_ADD
|| (opline->op1_type == IS_CONST
&& Z_TYPE(ZEND_OP1_LITERAL(opline)) != IS_ARRAY)) {
/* protection from array add: $a = array + $a is not commutative! */
COPY_NODE(opline->op1, opline->op2);
COPY_NODE(opline->op2, tmp);
}
}
if ((opline->op1_type & (IS_VAR | IS_CV))
&& opline->op1.var == next_opline->op1.var
&& opline->op1_type == next_opline->op1_type) {
switch (opline->opcode) {
case ZEND_ADD:
opline->opcode = ZEND_ASSIGN_ADD;
break;
case ZEND_SUB:
opline->opcode = ZEND_ASSIGN_SUB;
break;
case ZEND_MUL:
opline->opcode = ZEND_ASSIGN_MUL;
break;
case ZEND_DIV:
opline->opcode = ZEND_ASSIGN_DIV;
break;
case ZEND_MOD:
opline->opcode = ZEND_ASSIGN_MOD;
break;
case ZEND_POW:
opline->opcode = ZEND_ASSIGN_POW;
break;
case ZEND_CONCAT:
opline->opcode = ZEND_ASSIGN_CONCAT;
break;
case ZEND_SL:
opline->opcode = ZEND_ASSIGN_SL;
break;
case ZEND_SR:
opline->opcode = ZEND_ASSIGN_SR;
break;
case ZEND_BW_OR:
opline->opcode = ZEND_ASSIGN_BW_OR;
break;
case ZEND_BW_AND:
opline->opcode = ZEND_ASSIGN_BW_AND;
break;
case ZEND_BW_XOR:
opline->opcode = ZEND_ASSIGN_BW_XOR;
break;
}
COPY_NODE(opline->result, next_opline->result);
MAKE_NOP(next_opline);
opline++;
opline_num++;
}
}
break;
case ZEND_JMP:
if (op_array->fn_flags & ZEND_ACC_HAS_FINALLY_BLOCK) {
break;
}
/* convert L: JMP L+1 to NOP */
if (ZEND_OP1_JMP_ADDR(opline) == opline + 1) {
MAKE_NOP(opline);
goto done_jmp_optimization;
}
/* convert JMP L1 ... L1: JMP L2 to JMP L2 .. L1: JMP L2 */
while (ZEND_OP1_JMP_ADDR(opline) < end
&& ZEND_OP1_JMP_ADDR(opline)->opcode == ZEND_JMP) {
zend_op *target = ZEND_OP1_JMP_ADDR(opline);
CHECK_JMP(target, done_jmp_optimization);
ZEND_SET_OP_JMP_ADDR(opline, opline->op1, ZEND_OP1_JMP_ADDR(target));
}
break;
case ZEND_JMP_SET:
case ZEND_COALESCE:
if (op_array->fn_flags & ZEND_ACC_HAS_FINALLY_BLOCK) {
break;
}
while (ZEND_OP2_JMP_ADDR(opline) < end) {
zend_op *target = ZEND_OP2_JMP_ADDR(opline);
if (target->opcode == ZEND_JMP) {
ZEND_SET_OP_JMP_ADDR(opline, opline->op2, ZEND_OP1_JMP_ADDR(target));
} else {
break;
}
}
break;
case ZEND_JMPZ:
case ZEND_JMPNZ:
if (op_array->fn_flags & ZEND_ACC_HAS_FINALLY_BLOCK) {
break;
}
while (ZEND_OP2_JMP_ADDR(opline) < end) {
zend_op *target = ZEND_OP2_JMP_ADDR(opline);
if (target->opcode == ZEND_JMP) {
/* plain JMP */
/* JMPZ(X,L1), L1: JMP(L2) => JMPZ(X,L2), L1: JMP(L2) */
CHECK_JMP(target, done_jmp_optimization);
ZEND_SET_OP_JMP_ADDR(opline, opline->op2, ZEND_OP1_JMP_ADDR(target));
} else if (target->opcode == opline->opcode &&
SAME_VAR(opline->op1, target->op1)) {
/* same opcode and same var as this opcode */
/* JMPZ(X,L1), L1: JMPZ(X,L2) => JMPZ(X,L2), L1: JMPZ(X,L2) */
CHECK_JMP2(target, done_jmp_optimization);
ZEND_SET_OP_JMP_ADDR(opline, opline->op2, ZEND_OP2_JMP_ADDR(target));
} else if (target->opcode == opline->opcode + 3 &&
SAME_VAR(opline->op1, target->op1)) {
/* convert JMPZ(X,L1), L1: T JMPZ_EX(X,L2) to
T = JMPZ_EX(X, L2) */
ZEND_SET_OP_JMP_ADDR(opline, opline->op2, ZEND_OP2_JMP_ADDR(target));
opline->opcode += 3;
COPY_NODE(opline->result, target->result);
break;
} else if (target->opcode == INV_COND(opline->opcode) &&
SAME_VAR(opline->op1, target->op1)) {
/* convert JMPZ(X,L1), L1: JMPNZ(X,L2) to
JMPZ(X,L1+1) */
ZEND_SET_OP_JMP_ADDR(opline, opline->op2, target + 1);
break;
} else if (target->opcode == INV_COND_EX(opline->opcode) &&
SAME_VAR(opline->op1, target->op1)) {
/* convert JMPZ(X,L1), L1: T = JMPNZ_EX(X,L2) to
T = JMPZ_EX(X,L1+1) */
ZEND_SET_OP_JMP_ADDR(opline, opline->op2, target + 1);
opline->opcode += 3;
COPY_NODE(opline->result, target->result);
break;
} else {
break;
}
}
break;
case ZEND_JMPZ_EX:
case ZEND_JMPNZ_EX: {
zend_uchar T_type = opline->result_type;
znode_op T = opline->result;
if (op_array->fn_flags & ZEND_ACC_HAS_FINALLY_BLOCK) {
break;
}
/* convert L: T = JMPZ_EX X,L+1 to T = BOOL(X) */
/* convert L: T = JMPZ_EX T,L+1 to NOP */
if (ZEND_OP2_JMP_ADDR(opline) == opline + 1) {
if (opline->op1.var == opline->result.var) {
MAKE_NOP(opline);
} else {
opline->opcode = ZEND_BOOL;
SET_UNUSED(opline->op2);
}
goto done_jmp_optimization;
}
while (ZEND_OP2_JMP_ADDR(opline) < end) {
zend_op *target = ZEND_OP2_JMP_ADDR(opline);
if (target->opcode == opline->opcode-3 &&
SAME_VAR(target->op1, T)) {
/* convert T=JMPZ_EX(X,L1), L1: JMPZ(T,L2) to
JMPZ_EX(X,L2) */
CHECK_JMP2(target, continue_jmp_ex_optimization);
ZEND_SET_OP_JMP_ADDR(opline, opline->op2, ZEND_OP2_JMP_ADDR(target));
} else if (target->opcode == opline->opcode &&
SAME_VAR(target->op1, T) &&
SAME_VAR(target->result, T)) {
/* convert T=JMPZ_EX(X,L1), L1: T=JMPZ_EX(T,L2) to
JMPZ_EX(X,L2) */
CHECK_JMP2(target, continue_jmp_ex_optimization);
ZEND_SET_OP_JMP_ADDR(opline, opline->op2, ZEND_OP2_JMP_ADDR(target));
} else if (target->opcode == ZEND_JMPZNZ &&
SAME_VAR(target->op1, T)) {
/* Check for JMPZNZ with same cond variable */
zend_op *new_target;
CHECK_JMP2(target, continue_jmp_ex_optimization);
if (opline->opcode == ZEND_JMPZ_EX) {
new_target = ZEND_OP2_JMP_ADDR(target);
} else {
/* JMPNZ_EX */
new_target = ZEND_OFFSET_TO_OPLINE(target, target->extended_value);
}
ZEND_SET_OP_JMP_ADDR(opline, opline->op2, new_target);
} else if ((target->opcode == INV_EX_COND_EX(opline->opcode) ||
target->opcode == INV_EX_COND(opline->opcode)) &&
SAME_VAR(opline->op1, target->op1)) {
/* convert JMPZ_EX(X,L1), L1: JMPNZ_EX(X,L2) to
JMPZ_EX(X,L1+1) */
ZEND_SET_OP_JMP_ADDR(opline, opline->op2, target + 1);
break;
} else if (target->opcode == INV_EX_COND(opline->opcode) &&
SAME_VAR(target->op1, T)) {
/* convert T=JMPZ_EX(X,L1), L1: JMPNZ(T,L2) to
JMPZ_EX(X,L1+1) */
ZEND_SET_OP_JMP_ADDR(opline, opline->op2, target + 1);
break;
} else if (target->opcode == INV_EX_COND_EX(opline->opcode) &&
SAME_VAR(target->op1, T) &&
SAME_VAR(target->result, T)) {
/* convert T=JMPZ_EX(X,L1), L1: T=JMPNZ_EX(T,L2) to
JMPZ_EX(X,L1+1) */
ZEND_SET_OP_JMP_ADDR(opline, opline->op2, target + 1);
break;
} else if (target->opcode == ZEND_BOOL &&
SAME_VAR(opline->result, target->op1)) {
/* convert Y = JMPZ_EX(X,L1), L1: Z = BOOL(Y) to
Z = JMPZ_EX(X,L1+1) */
opline->result.var = target->result.var;
ZEND_SET_OP_JMP_ADDR(opline, opline->op2, target + 1);
break;
} else {
break;
}
} /* while */
continue_jmp_ex_optimization:
break;
#if 0
/* If Ti = JMPZ_EX(X, L) and Ti is not used, convert to JMPZ(X, L) */
{
zend_op *op;
for(op = opline+1; op<end; op++) {
if(op->result_type == IS_TMP_VAR &&
op->result.var == opline->result.var) {
break; /* can pass to part 2 */
}
if(op->opcode == ZEND_JMP ||
op->opcode == ZEND_JMPZ ||
op->opcode == ZEND_JMPZ_EX ||
op->opcode == ZEND_JMPNZ ||
op->opcode == ZEND_JMPNZ_EX ||
op->opcode == ZEND_JMPZNZ ||
op->opcode == ZEND_CASE ||
op->opcode == ZEND_RETURN ||
op->opcode == ZEND_RETURN_BY_REF ||
op->opcode == ZEND_FAST_RET ||
op->opcode == ZEND_FE_FETCH_R ||
op->opcode == ZEND_FE_FETCH_RW ||
op->opcode == ZEND_EXIT) {
break;
}
if(op->op1_type == IS_TMP_VAR &&
op->op1.var == opline->result.var) {
goto done_jmp_optimization;
}
if(op->op2_type == IS_TMP_VAR &&
op->op2.var == opline->result.var) {
goto done_jmp_optimization;
}
} /* for */
for(op = &op_array->opcodes[opline->op2.opline_num]; op<end; op++) {
if(op->result_type == IS_TMP_VAR &&
op->result.var == opline->result.var) {
break; /* can pass to optimization */
}
if(op->opcode == ZEND_JMP ||
op->opcode == ZEND_JMPZ ||
op->opcode == ZEND_JMPZ_EX ||
op->opcode == ZEND_JMPNZ ||
op->opcode == ZEND_JMPNZ_EX ||
op->opcode == ZEND_JMPZNZ ||
op->opcode == ZEND_CASE ||
op->opcode == ZEND_RETURN ||
op->opcode == ZEND_RETURN_BY_REF ||
op->opcode == ZEND_FAST_RET ||
op->opcode == ZEND_FE_FETCH_R ||
op->opcode == ZEND_FE_FETCH_RW ||
op->opcode == ZEND_EXIT) {
break;
}
if(op->op1_type == IS_TMP_VAR &&
op->op1.var == opline->result.var) {
goto done_jmp_optimization;
}
if(op->op2_type == IS_TMP_VAR &&
op->op2.var == opline->result.var) {
goto done_jmp_optimization;
}
}
opline->opcode = opline->opcode-3; /* JMP_EX -> JMP */
SET_UNUSED(opline->result);
break;
}
#endif
}
break;
case ZEND_JMPZNZ:
if (op_array->fn_flags & ZEND_ACC_HAS_FINALLY_BLOCK) {
break;
}
/* JMPZNZ(X,L1,L2), L1: JMP(L3) => JMPZNZ(X,L3,L2), L1: JMP(L3) */
while (ZEND_OP2_JMP_ADDR(opline) < end
&& ZEND_OP2_JMP_ADDR(opline)->opcode == ZEND_JMP) {
zend_op *target = ZEND_OP2_JMP_ADDR(opline);
CHECK_JMP(target, continue_jmpznz_optimization);
ZEND_SET_OP_JMP_ADDR(opline, opline->op2, ZEND_OP1_JMP_ADDR(target));
}
continue_jmpznz_optimization:
/* JMPZNZ(X,L1,L2), L2: JMP(L3) => JMPZNZ(X,L1,L3), L2: JMP(L3) */
while (ZEND_OFFSET_TO_OPLINE(opline, opline->extended_value) < end
&& ZEND_OFFSET_TO_OPLINE(opline, opline->extended_value)->opcode == ZEND_JMP) {
zend_op *target = ZEND_OFFSET_TO_OPLINE(opline, opline->extended_value);
CHECK_JMP(target, done_jmp_optimization);
opline->extended_value = ZEND_OPLINE_TO_OFFSET(opline, ZEND_OP1_JMP_ADDR(target));
}
break;
case ZEND_POST_INC_OBJ:
case ZEND_POST_DEC_OBJ:
case ZEND_POST_INC:
case ZEND_POST_DEC: {
/* POST_INC, FREE => PRE_INC */
zend_op *next_op = opline + 1;
if (next_op >= end) {
break;
}
if (next_op->opcode == ZEND_FREE &&
next_op->op1.var == opline->result.var) {
MAKE_NOP(next_op);
opline->opcode -= 2;
opline->result_type = IS_UNUSED;
}
}
break;
}
done_jmp_optimization:
opline++;
opline_num++;
}
free_alloca(jmp_hitlist, use_heap);
}