static void zend_ssa_remove_nops(zend_op_array *op_array, zend_ssa *ssa)
{
zend_basic_block *blocks = ssa->cfg.blocks;
zend_basic_block *end = blocks + ssa->cfg.blocks_count;
zend_basic_block *b;
zend_func_info *func_info;
int j;
uint32_t i;
uint32_t target = 0;
uint32_t *shiftlist;
ALLOCA_FLAG(use_heap);
shiftlist = (uint32_t *)do_alloca(sizeof(uint32_t) * op_array->last, use_heap);
memset(shiftlist, 0, sizeof(uint32_t) * op_array->last);
for (b = blocks; b < end; b++) {
if (b->flags & ZEND_BB_REACHABLE) {
i = b->start;
b->start = target;
while (i <= b->end) {
if (EXPECTED(op_array->opcodes[i].opcode != ZEND_NOP) ||
/*keep NOP to support ZEND_VM_SMART_BRANCH */
(i > 0 &&
i + 1 < op_array->last &&
(op_array->opcodes[i+1].opcode == ZEND_JMPZ ||
op_array->opcodes[i+1].opcode == ZEND_JMPNZ) &&
(op_array->opcodes[i-1].opcode == ZEND_IS_IDENTICAL ||
op_array->opcodes[i-1].opcode == ZEND_IS_NOT_IDENTICAL ||
op_array->opcodes[i-1].opcode == ZEND_IS_EQUAL ||
op_array->opcodes[i-1].opcode == ZEND_IS_NOT_EQUAL ||
op_array->opcodes[i-1].opcode == ZEND_IS_SMALLER ||
op_array->opcodes[i-1].opcode == ZEND_IS_SMALLER_OR_EQUAL ||
op_array->opcodes[i-1].opcode == ZEND_CASE ||
op_array->opcodes[i-1].opcode == ZEND_ISSET_ISEMPTY_VAR ||
op_array->opcodes[i-1].opcode == ZEND_ISSET_ISEMPTY_STATIC_PROP ||
op_array->opcodes[i-1].opcode == ZEND_ISSET_ISEMPTY_DIM_OBJ ||
op_array->opcodes[i-1].opcode == ZEND_ISSET_ISEMPTY_PROP_OBJ ||
op_array->opcodes[i-1].opcode == ZEND_INSTANCEOF ||
op_array->opcodes[i-1].opcode == ZEND_TYPE_CHECK ||
op_array->opcodes[i-1].opcode == ZEND_DEFINED))) {
if (i != target) {
op_array->opcodes[target] = op_array->opcodes[i];
ssa->ops[target] = ssa->ops[i];
shiftlist[i] = i - target;
}
target++;
}
i++;
}
if (b->end != target - 1) {
zend_op *opline;
zend_op *new_opline;
opline = op_array->opcodes + b->end;
b->end = target - 1;
new_opline = op_array->opcodes + b->end;
switch (new_opline->opcode) {
case ZEND_JMP:
case ZEND_FAST_CALL:
ZEND_SET_OP_JMP_ADDR(new_opline, new_opline->op1, ZEND_OP1_JMP_ADDR(opline));
break;
case ZEND_JMPZNZ:
new_opline->extended_value = ZEND_OPLINE_NUM_TO_OFFSET(op_array, new_opline, ZEND_OFFSET_TO_OPLINE_NUM(op_array, opline, opline->extended_value));
/* break missing intentionally */
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_ASSERT_CHECK:
ZEND_SET_OP_JMP_ADDR(new_opline, new_opline->op2, ZEND_OP2_JMP_ADDR(opline));
break;
case ZEND_CATCH:
if (!opline->result.num) {
new_opline->extended_value = ZEND_OPLINE_NUM_TO_OFFSET(op_array, new_opline, ZEND_OFFSET_TO_OPLINE_NUM(op_array, opline, opline->extended_value));
}
break;
case ZEND_DECLARE_ANON_CLASS:
case ZEND_DECLARE_ANON_INHERITED_CLASS:
case ZEND_FE_FETCH_R:
case ZEND_FE_FETCH_RW:
new_opline->extended_value = ZEND_OPLINE_NUM_TO_OFFSET(op_array, new_opline, ZEND_OFFSET_TO_OPLINE_NUM(op_array, opline, opline->extended_value));
break;
}
}
}
}
if (target != op_array->last) {
/* reset rest opcodes */
for (i = target; i < op_array->last; i++) {
MAKE_NOP(op_array->opcodes + i);
}
/* update SSA variables */
for (j = 0; j < ssa->vars_count; j++) {
if (ssa->vars[j].definition >= 0) {
ssa->vars[j].definition -= shiftlist[ssa->vars[j].definition];
}
if (ssa->vars[j].use_chain >= 0) {
ssa->vars[j].use_chain -= shiftlist[ssa->vars[j].use_chain];
}
}
for (i = 0; i < op_array->last; i++) {
if (ssa->ops[i].op1_use_chain >= 0) {
ssa->ops[i].op1_use_chain -= shiftlist[ssa->ops[i].op1_use_chain];
}
if (ssa->ops[i].op2_use_chain >= 0) {
ssa->ops[i].op2_use_chain -= shiftlist[ssa->ops[i].op2_use_chain];
}
if (ssa->ops[i].res_use_chain >= 0) {
ssa->ops[i].res_use_chain -= shiftlist[ssa->ops[i].res_use_chain];
}
}
/* update branch targets */
for (b = blocks; b < end; b++) {
if (b->flags & ZEND_BB_REACHABLE) {
zend_op *opline = op_array->opcodes + b->end;
switch (opline->opcode) {
case ZEND_JMP:
case ZEND_FAST_CALL:
ZEND_SET_OP_JMP_ADDR(opline, opline->op1, ZEND_OP1_JMP_ADDR(opline) - shiftlist[ZEND_OP1_JMP_ADDR(opline) - op_array->opcodes]);
break;
case ZEND_JMPZNZ:
opline->extended_value = ZEND_OPLINE_NUM_TO_OFFSET(op_array, opline, ZEND_OFFSET_TO_OPLINE_NUM(op_array, opline, opline->extended_value) - shiftlist[ZEND_OFFSET_TO_OPLINE_NUM(op_array, opline, opline->extended_value)]);
/* break missing intentionally */
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_ASSERT_CHECK:
ZEND_SET_OP_JMP_ADDR(opline, opline->op2, ZEND_OP2_JMP_ADDR(opline) - shiftlist[ZEND_OP2_JMP_ADDR(opline) - op_array->opcodes]);
break;
case ZEND_DECLARE_ANON_CLASS:
case ZEND_DECLARE_ANON_INHERITED_CLASS:
case ZEND_FE_FETCH_R:
case ZEND_FE_FETCH_RW:
case ZEND_CATCH:
opline->extended_value = ZEND_OPLINE_NUM_TO_OFFSET(op_array, opline, ZEND_OFFSET_TO_OPLINE_NUM(op_array, opline, opline->extended_value) - shiftlist[ZEND_OFFSET_TO_OPLINE_NUM(op_array, opline, opline->extended_value)]);
break;
}
}
}
/* update brk/cont array */
for (j = 0; j < op_array->last_live_range; j++) {
op_array->live_range[j].start -= shiftlist[op_array->live_range[j].start];
op_array->live_range[j].end -= shiftlist[op_array->live_range[j].end];
}
/* update try/catch array */
for (j = 0; j < op_array->last_try_catch; j++) {
op_array->try_catch_array[j].try_op -= shiftlist[op_array->try_catch_array[j].try_op];
op_array->try_catch_array[j].catch_op -= shiftlist[op_array->try_catch_array[j].catch_op];
if (op_array->try_catch_array[j].finally_op) {
op_array->try_catch_array[j].finally_op -= shiftlist[op_array->try_catch_array[j].finally_op];
op_array->try_catch_array[j].finally_end -= shiftlist[op_array->try_catch_array[j].finally_end];
}
}
/* update early binding list */
if (op_array->early_binding != (uint32_t)-1) {
uint32_t *opline_num = &op_array->early_binding;
do {
*opline_num -= shiftlist[*opline_num];
opline_num = &ZEND_RESULT(&op_array->opcodes[*opline_num]).opline_num;
} while (*opline_num != (uint32_t)-1);
}
/* update call graph */
func_info = ZEND_FUNC_INFO(op_array);
if (func_info) {
zend_call_info *call_info = func_info->callee_info;
while (call_info) {
call_info->caller_init_opline -=
shiftlist[call_info->caller_init_opline - op_array->opcodes];
call_info->caller_call_opline -=
shiftlist[call_info->caller_call_opline - op_array->opcodes];
call_info = call_info->next_callee;
}
}
op_array->last = target;
}
free_alloca(shiftlist, use_heap);
}
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:
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);
}
void zend_optimizer_pass2(zend_op_array *op_array)
{
zend_op *opline;
zend_op *end = op_array->opcodes + op_array->last;
opline = op_array->opcodes;
while (opline < end) {
switch (opline->opcode) {
case ZEND_ADD:
case ZEND_SUB:
case ZEND_MUL:
case ZEND_DIV:
case ZEND_POW:
if (ZEND_OP1_TYPE(opline) == IS_CONST) {
if (Z_TYPE(ZEND_OP1_LITERAL(opline)) == IS_STRING) {
convert_scalar_to_number(&ZEND_OP1_LITERAL(opline));
}
}
/* break missing *intentionally* - the assign_op's may only optimize op2 */
case ZEND_ASSIGN_ADD:
case ZEND_ASSIGN_SUB:
case ZEND_ASSIGN_MUL:
case ZEND_ASSIGN_DIV:
case ZEND_ASSIGN_POW:
if (opline->extended_value != 0) {
/* object tristate op - don't attempt to optimize it! */
break;
}
if (ZEND_OP2_TYPE(opline) == IS_CONST) {
if (Z_TYPE(ZEND_OP2_LITERAL(opline)) == IS_STRING) {
convert_scalar_to_number(&ZEND_OP2_LITERAL(opline));
}
}
break;
case ZEND_MOD:
case ZEND_SL:
case ZEND_SR:
if (ZEND_OP1_TYPE(opline) == IS_CONST) {
if (Z_TYPE(ZEND_OP1_LITERAL(opline)) != IS_LONG) {
convert_to_long(&ZEND_OP1_LITERAL(opline));
}
}
/* break missing *intentionally - the assign_op's may only optimize op2 */
case ZEND_ASSIGN_MOD:
case ZEND_ASSIGN_SL:
case ZEND_ASSIGN_SR:
if (opline->extended_value != 0) {
/* object tristate op - don't attempt to optimize it! */
break;
}
if (ZEND_OP2_TYPE(opline) == IS_CONST) {
if (Z_TYPE(ZEND_OP2_LITERAL(opline)) != IS_LONG) {
convert_to_long(&ZEND_OP2_LITERAL(opline));
}
}
break;
case ZEND_CONCAT:
case ZEND_FAST_CONCAT:
if (ZEND_OP1_TYPE(opline) == IS_CONST) {
if (Z_TYPE(ZEND_OP1_LITERAL(opline)) != IS_STRING) {
convert_to_string(&ZEND_OP1_LITERAL(opline));
}
}
/* break missing *intentionally - the assign_op's may only optimize op2 */
case ZEND_ASSIGN_CONCAT:
if (opline->extended_value != 0) {
/* object tristate op - don't attempt to optimize it! */
break;
}
if (ZEND_OP2_TYPE(opline) == IS_CONST) {
if (Z_TYPE(ZEND_OP2_LITERAL(opline)) != IS_STRING) {
convert_to_string(&ZEND_OP2_LITERAL(opline));
}
}
break;
case ZEND_JMPZ_EX:
case ZEND_JMPNZ_EX:
/* convert Ti = JMPZ_EX(Ti, L) to JMPZ(Ti, L) */
if (0 && /* FIXME: temporary disable unsafe pattern */
ZEND_OP1_TYPE(opline) == IS_TMP_VAR &&
ZEND_RESULT_TYPE(opline) == IS_TMP_VAR &&
ZEND_OP1(opline).var == ZEND_RESULT(opline).var) {
opline->opcode -= 3;
/* convert Ti = JMPZ_EX(C, L) => Ti = QM_ASSIGN(C)
in case we know it wouldn't jump */
} else if (ZEND_OP1_TYPE(opline) == IS_CONST) {
int should_jmp = zend_is_true(&ZEND_OP1_LITERAL(opline));
if (opline->opcode == ZEND_JMPZ_EX) {
should_jmp = !should_jmp;
}
if (!should_jmp) {
opline->opcode = ZEND_QM_ASSIGN;
SET_UNUSED(opline->op2);
}
}
break;
case ZEND_JMPZ:
case ZEND_JMPNZ:
if (ZEND_OP1_TYPE(opline) == IS_CONST) {
int should_jmp = zend_is_true(&ZEND_OP1_LITERAL(opline));
if (opline->opcode == ZEND_JMPZ) {
should_jmp = !should_jmp;
}
literal_dtor(&ZEND_OP1_LITERAL(opline));
ZEND_OP1_TYPE(opline) = IS_UNUSED;
if (should_jmp) {
opline->opcode = ZEND_JMP;
COPY_NODE(opline->op1, opline->op2);
} else {
MAKE_NOP(opline);
}
break;
}
if ((opline + 1)->opcode == ZEND_JMP) {
/* JMPZ(X, L1), JMP(L2) => JMPZNZ(X, L1, L2) */
/* JMPNZ(X, L1), JMP(L2) => JMPZNZ(X, L2, L1) */
if (ZEND_OP2_JMP_ADDR(opline) == ZEND_OP1_JMP_ADDR(opline + 1)) {
/* JMPZ(X, L1), JMP(L1) => NOP, JMP(L1) */
MAKE_NOP(opline);
} else {
if (opline->opcode == ZEND_JMPZ) {
opline->extended_value = ZEND_OPLINE_TO_OFFSET(opline, ZEND_OP1_JMP_ADDR(opline + 1));
} else {
opline->extended_value = ZEND_OPLINE_TO_OFFSET(opline, ZEND_OP2_JMP_ADDR(opline));
ZEND_SET_OP_JMP_ADDR(opline, opline->op2, ZEND_OP1_JMP_ADDR(opline + 1));
}
opline->opcode = ZEND_JMPZNZ;
}
}
break;
case ZEND_JMPZNZ:
if (ZEND_OP1_TYPE(opline) == IS_CONST) {
zend_op *target_opline;
if (zend_is_true(&ZEND_OP1_LITERAL(opline))) {
target_opline = ZEND_OFFSET_TO_OPLINE(opline, opline->extended_value); /* JMPNZ */
} else {
target_opline = ZEND_OP2_JMP_ADDR(opline); /* JMPZ */
}
literal_dtor(&ZEND_OP1_LITERAL(opline));
ZEND_SET_OP_JMP_ADDR(opline, opline->op1, target_opline);
ZEND_OP1_TYPE(opline) = IS_UNUSED;
opline->opcode = ZEND_JMP;
}
break;
}
opline++;
}
}
void zend_optimizer_pass2(zend_op_array *op_array)
{
zend_op *opline;
zend_op *end = op_array->opcodes + op_array->last;
opline = op_array->opcodes;
while (opline < end) {
switch (opline->opcode) {
case ZEND_ADD:
case ZEND_SUB:
case ZEND_MUL:
case ZEND_DIV:
case ZEND_POW:
if (opline->op1_type == IS_CONST) {
if (Z_TYPE(ZEND_OP1_LITERAL(opline)) == IS_STRING) {
/* don't optimise if it should produce a runtime numeric string error */
if (is_numeric_string(Z_STRVAL(ZEND_OP1_LITERAL(opline)), Z_STRLEN(ZEND_OP1_LITERAL(opline)), NULL, NULL, 0)) {
convert_scalar_to_number(&ZEND_OP1_LITERAL(opline));
}
}
}
/* break missing *intentionally* - the assign_op's may only optimize op2 */
case ZEND_ASSIGN_ADD:
case ZEND_ASSIGN_SUB:
case ZEND_ASSIGN_MUL:
case ZEND_ASSIGN_DIV:
case ZEND_ASSIGN_POW:
if (opline->extended_value != 0) {
/* object tristate op - don't attempt to optimize it! */
break;
}
if (opline->op2_type == IS_CONST) {
if (Z_TYPE(ZEND_OP2_LITERAL(opline)) == IS_STRING) {
/* don't optimise if it should produce a runtime numeric string error */
if (is_numeric_string(Z_STRVAL(ZEND_OP2_LITERAL(opline)), Z_STRLEN(ZEND_OP2_LITERAL(opline)), NULL, NULL, 0)) {
convert_scalar_to_number(&ZEND_OP2_LITERAL(opline));
}
}
}
break;
case ZEND_MOD:
case ZEND_SL:
case ZEND_SR:
if (opline->op1_type == IS_CONST) {
if (Z_TYPE(ZEND_OP1_LITERAL(opline)) != IS_LONG) {
/* don't optimise if it should produce a runtime numeric string error */
if (!(Z_TYPE(ZEND_OP1_LITERAL(opline)) == IS_STRING
&& !is_numeric_string(Z_STRVAL(ZEND_OP1_LITERAL(opline)), Z_STRLEN(ZEND_OP1_LITERAL(opline)), NULL, NULL, 0))) {
convert_to_long(&ZEND_OP1_LITERAL(opline));
}
}
}
/* break missing *intentionally - the assign_op's may only optimize op2 */
case ZEND_ASSIGN_MOD:
case ZEND_ASSIGN_SL:
case ZEND_ASSIGN_SR:
if (opline->extended_value != 0) {
/* object tristate op - don't attempt to optimize it! */
break;
}
if (opline->op2_type == IS_CONST) {
if (Z_TYPE(ZEND_OP2_LITERAL(opline)) != IS_LONG) {
/* don't optimise if it should produce a runtime numeric string error */
if (!(Z_TYPE(ZEND_OP2_LITERAL(opline)) == IS_STRING
&& !is_numeric_string(Z_STRVAL(ZEND_OP2_LITERAL(opline)), Z_STRLEN(ZEND_OP2_LITERAL(opline)), NULL, NULL, 0))) {
convert_to_long(&ZEND_OP2_LITERAL(opline));
}
}
}
break;
case ZEND_CONCAT:
case ZEND_FAST_CONCAT:
if (opline->op1_type == IS_CONST) {
if (Z_TYPE(ZEND_OP1_LITERAL(opline)) != IS_STRING) {
convert_to_string(&ZEND_OP1_LITERAL(opline));
}
}
/* break missing *intentionally - the assign_op's may only optimize op2 */
case ZEND_ASSIGN_CONCAT:
if (opline->extended_value != 0) {
/* object tristate op - don't attempt to optimize it! */
break;
}
if (opline->op2_type == IS_CONST) {
if (Z_TYPE(ZEND_OP2_LITERAL(opline)) != IS_STRING) {
convert_to_string(&ZEND_OP2_LITERAL(opline));
}
}
break;
case ZEND_JMPZ_EX:
case ZEND_JMPNZ_EX:
/* convert Ti = JMPZ_EX(Ti, L) to JMPZ(Ti, L) */
#if 0
/* Disabled unsafe pattern: in conjunction with
* ZEND_VM_SMART_BRANCH() this may improperly eliminate
* assignment to Ti.
*/
if (opline->op1_type == IS_TMP_VAR &&
opline->result_type == IS_TMP_VAR &&
opline->op1.var == opline->result.var) {
opline->opcode -= 3;
SET_UNUSED(opline->result);
} else
#endif
/* convert Ti = JMPZ_EX(C, L) => Ti = QM_ASSIGN(C)
in case we know it wouldn't jump */
if (opline->op1_type == IS_CONST) {
int should_jmp = zend_is_true(&ZEND_OP1_LITERAL(opline));
if (opline->opcode == ZEND_JMPZ_EX) {
should_jmp = !should_jmp;
}
if (!should_jmp) {
opline->opcode = ZEND_QM_ASSIGN;
SET_UNUSED(opline->op2);
}
}
break;
case ZEND_JMPZ:
case ZEND_JMPNZ:
if (opline->op1_type == IS_CONST) {
int should_jmp = zend_is_true(&ZEND_OP1_LITERAL(opline));
if (opline->opcode == ZEND_JMPZ) {
should_jmp = !should_jmp;
}
literal_dtor(&ZEND_OP1_LITERAL(opline));
opline->op1_type = IS_UNUSED;
if (should_jmp) {
opline->opcode = ZEND_JMP;
COPY_NODE(opline->op1, opline->op2);
} else {
MAKE_NOP(opline);
}
break;
}
if ((opline + 1)->opcode == ZEND_JMP) {
/* JMPZ(X, L1), JMP(L2) => JMPZNZ(X, L1, L2) */
/* JMPNZ(X, L1), JMP(L2) => JMPZNZ(X, L2, L1) */
if (ZEND_OP2_JMP_ADDR(opline) == ZEND_OP1_JMP_ADDR(opline + 1)) {
/* JMPZ(X, L1), JMP(L1) => NOP, JMP(L1) */
if (opline->op1_type == IS_CV) {
opline->opcode = ZEND_CHECK_VAR;
opline->op2.num = 0;
} else if (opline->op1_type & (IS_TMP_VAR|IS_VAR)) {
opline->opcode = ZEND_FREE;
opline->op2.num = 0;
} else {
MAKE_NOP(opline);
}
} else {
if (opline->opcode == ZEND_JMPZ) {
opline->extended_value = ZEND_OPLINE_TO_OFFSET(opline, ZEND_OP1_JMP_ADDR(opline + 1));
} else {
opline->extended_value = ZEND_OPLINE_TO_OFFSET(opline, ZEND_OP2_JMP_ADDR(opline));
ZEND_SET_OP_JMP_ADDR(opline, opline->op2, ZEND_OP1_JMP_ADDR(opline + 1));
}
opline->opcode = ZEND_JMPZNZ;
}
}
break;
case ZEND_JMPZNZ:
if (opline->op1_type == IS_CONST) {
zend_op *target_opline;
if (zend_is_true(&ZEND_OP1_LITERAL(opline))) {
target_opline = ZEND_OFFSET_TO_OPLINE(opline, opline->extended_value); /* JMPNZ */
} else {
target_opline = ZEND_OP2_JMP_ADDR(opline); /* JMPZ */
}
literal_dtor(&ZEND_OP1_LITERAL(opline));
ZEND_SET_OP_JMP_ADDR(opline, opline->op1, target_opline);
opline->op1_type = IS_UNUSED;
opline->opcode = ZEND_JMP;
}
break;
}
opline++;
}
}
void zend_optimizer_nop_removal(zend_op_array *op_array)
{
zend_op *end, *opline;
uint32_t new_count, i, shift;
int j;
uint32_t *shiftlist;
ALLOCA_FLAG(use_heap);
shiftlist = (uint32_t *)do_alloca(sizeof(uint32_t) * op_array->last, use_heap);
i = new_count = shift = 0;
end = op_array->opcodes + op_array->last;
for (opline = op_array->opcodes; opline < end; opline++) {
/* Kill JMP-over-NOP-s */
if (opline->opcode == ZEND_JMP && ZEND_OP1_JMP_ADDR(opline) > op_array->opcodes + i) {
/* check if there are only NOPs under the branch */
zend_op *target = ZEND_OP1_JMP_ADDR(opline) - 1;
while (target->opcode == ZEND_NOP) {
target--;
}
if (target == opline) {
/* only NOPs */
opline->opcode = ZEND_NOP;
}
}
shiftlist[i++] = shift;
if (opline->opcode == ZEND_NOP) {
shift++;
} else {
if (shift) {
zend_op *new_opline = op_array->opcodes + new_count;
*new_opline = *opline;
switch (new_opline->opcode) {
case ZEND_JMP:
case ZEND_FAST_CALL:
ZEND_SET_OP_JMP_ADDR(new_opline, new_opline->op1, ZEND_OP1_JMP_ADDR(opline));
break;
case ZEND_JMPZNZ:
new_opline->extended_value = ZEND_OPLINE_NUM_TO_OFFSET(op_array, new_opline, ZEND_OFFSET_TO_OPLINE_NUM(op_array, opline, opline->extended_value));
/* break missing intentionally */
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_ASSERT_CHECK:
ZEND_SET_OP_JMP_ADDR(new_opline, new_opline->op2, ZEND_OP2_JMP_ADDR(opline));
break;
case ZEND_CATCH:
if (!opline->result.num) {
new_opline->extended_value = ZEND_OPLINE_NUM_TO_OFFSET(op_array, new_opline, ZEND_OFFSET_TO_OPLINE_NUM(op_array, opline, opline->extended_value));
}
break;
case ZEND_DECLARE_ANON_CLASS:
case ZEND_DECLARE_ANON_INHERITED_CLASS:
case ZEND_FE_FETCH_R:
case ZEND_FE_FETCH_RW:
new_opline->extended_value = ZEND_OPLINE_NUM_TO_OFFSET(op_array, new_opline, ZEND_OFFSET_TO_OPLINE_NUM(op_array, opline, opline->extended_value));
break;
}
}
new_count++;
}
}
if (shift) {
op_array->last = new_count;
end = op_array->opcodes + op_array->last;
/* update JMPs */
for (opline = op_array->opcodes; opline<end; opline++) {
switch (opline->opcode) {
case ZEND_JMP:
case ZEND_FAST_CALL:
ZEND_SET_OP_JMP_ADDR(opline, opline->op1, ZEND_OP1_JMP_ADDR(opline) - shiftlist[ZEND_OP1_JMP_ADDR(opline) - op_array->opcodes]);
break;
case ZEND_JMPZNZ:
opline->extended_value = ZEND_OPLINE_NUM_TO_OFFSET(op_array, opline, ZEND_OFFSET_TO_OPLINE_NUM(op_array, opline, opline->extended_value) - shiftlist[ZEND_OFFSET_TO_OPLINE_NUM(op_array, opline, opline->extended_value)]);
/* break missing intentionally */
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_ASSERT_CHECK:
ZEND_SET_OP_JMP_ADDR(opline, opline->op2, ZEND_OP2_JMP_ADDR(opline) - shiftlist[ZEND_OP2_JMP_ADDR(opline) - op_array->opcodes]);
break;
case ZEND_DECLARE_ANON_CLASS:
case ZEND_DECLARE_ANON_INHERITED_CLASS:
case ZEND_FE_FETCH_R:
case ZEND_FE_FETCH_RW:
case ZEND_CATCH:
opline->extended_value = ZEND_OPLINE_NUM_TO_OFFSET(op_array, opline, ZEND_OFFSET_TO_OPLINE_NUM(op_array, opline, opline->extended_value) - shiftlist[ZEND_OFFSET_TO_OPLINE_NUM(op_array, opline, opline->extended_value)]);
break;
}
}
/* update brk/cont array */
for (j = 0; j < op_array->last_live_range; j++) {
op_array->live_range[j].start -= shiftlist[op_array->live_range[j].start];
op_array->live_range[j].end -= shiftlist[op_array->live_range[j].end];
}
/* update try/catch array */
for (j = 0; j < op_array->last_try_catch; j++) {
op_array->try_catch_array[j].try_op -= shiftlist[op_array->try_catch_array[j].try_op];
op_array->try_catch_array[j].catch_op -= shiftlist[op_array->try_catch_array[j].catch_op];
if (op_array->try_catch_array[j].finally_op) {
op_array->try_catch_array[j].finally_op -= shiftlist[op_array->try_catch_array[j].finally_op];
op_array->try_catch_array[j].finally_end -= shiftlist[op_array->try_catch_array[j].finally_end];
}
}
/* update early binding list */
if (op_array->early_binding != (uint32_t)-1) {
uint32_t *opline_num = &op_array->early_binding;
do {
*opline_num -= shiftlist[*opline_num];
opline_num = &ZEND_RESULT(&op_array->opcodes[*opline_num]).opline_num;
} while (*opline_num != (uint32_t)-1);
}
}
free_alloca(shiftlist, use_heap);
}