void optimize_temporary_variables(zend_op_array *op_array, zend_optimizer_ctx *ctx)
{
int T = op_array->T;
int offset = op_array->last_var;
char *taken_T; /* T index in use */
zend_op **start_of_T; /* opline where T is first used */
char *valid_T; /* Is the map_T valid */
int *map_T; /* Map's the T to its new index */
zend_op *opline, *end;
int currT;
int i;
int max = -1;
int var_to_free = -1;
void *checkpoint = zend_arena_checkpoint(ctx->arena);
taken_T = (char *) zend_arena_alloc(&ctx->arena, T);
start_of_T = (zend_op **) zend_arena_alloc(&ctx->arena, T * sizeof(zend_op *));
valid_T = (char *) zend_arena_alloc(&ctx->arena, T);
map_T = (int *) zend_arena_alloc(&ctx->arena, T * sizeof(int));
end = op_array->opcodes;
opline = &op_array->opcodes[op_array->last - 1];
/* Find T definition points */
while (opline >= end) {
if (ZEND_RESULT_TYPE(opline) & (IS_VAR | IS_TMP_VAR)) {
start_of_T[VAR_NUM(ZEND_RESULT(opline).var) - offset] = opline;
}
/* special puprose variable to keep HashPointer on VM stack */
if (opline->opcode == ZEND_OP_DATA &&
(opline-1)->opcode == ZEND_FE_FETCH &&
opline->op1_type == IS_TMP_VAR) {
start_of_T[VAR_NUM(ZEND_OP1(opline).var) - offset] = opline;
if (sizeof(HashPointer) > sizeof(zval)) {
/* Make shure 1 zval is enough for HashPointer (2 must be enough) */
start_of_T[VAR_NUM(ZEND_OP1(opline).var) + 1 - offset] = opline;
}
}
opline--;
}
memset(valid_T, 0, T);
memset(taken_T, 0, T);
end = op_array->opcodes;
opline = &op_array->opcodes[op_array->last - 1];
while (opline >= end) {
if ((ZEND_OP1_TYPE(opline) & (IS_VAR | IS_TMP_VAR))) {
/* special puprose variable to keep HashPointer on VM stack */
if (opline->opcode == ZEND_OP_DATA &&
(opline-1)->opcode == ZEND_FE_FETCH &&
opline->op1_type == IS_TMP_VAR) {
max++;
ZEND_OP1(opline).var = NUM_VAR(max + offset);
if (sizeof(HashPointer) > sizeof(zval)) {
/* Make shure 1 zval is enough for HashPointer (2 must be enough) */
max++;
}
} else {
currT = VAR_NUM(ZEND_OP1(opline).var) - offset;
if (!valid_T[currT]) {
GET_AVAILABLE_T();
map_T[currT] = i;
valid_T[currT] = 1;
}
ZEND_OP1(opline).var = NUM_VAR(map_T[currT] + offset);
}
}
/* Skip OP_DATA */
if (opline->opcode == ZEND_OP_DATA &&
(opline-1)->opcode == ZEND_ASSIGN_DIM) {
opline--;
continue;
}
if ((ZEND_OP2_TYPE(opline) & (IS_VAR | IS_TMP_VAR))) {
currT = VAR_NUM(ZEND_OP2(opline).var) - offset;
if (!valid_T[currT]) {
GET_AVAILABLE_T();
map_T[currT] = i;
valid_T[currT] = 1;
}
ZEND_OP2(opline).var = NUM_VAR(map_T[currT] + offset);
}
if (opline->opcode == ZEND_DECLARE_INHERITED_CLASS ||
opline->opcode == ZEND_DECLARE_INHERITED_CLASS_DELAYED) {
currT = VAR_NUM(opline->extended_value) - offset;
if (!valid_T[currT]) {
GET_AVAILABLE_T();
map_T[currT] = i;
valid_T[currT] = 1;
}
opline->extended_value = NUM_VAR(map_T[currT] + offset);
}
/* Allocate OP_DATA->op2 after "operands", but before "result" */
if (opline->opcode == ZEND_ASSIGN_DIM &&
(opline + 1)->opcode == ZEND_OP_DATA &&
ZEND_OP2_TYPE(opline + 1) & (IS_VAR | IS_TMP_VAR)) {
currT = VAR_NUM(ZEND_OP2(opline + 1).var) - offset;
GET_AVAILABLE_T();
map_T[currT] = i;
valid_T[currT] = 1;
taken_T[i] = 0;
ZEND_OP2(opline + 1).var = NUM_VAR(i + offset);
var_to_free = i;
}
if (ZEND_RESULT_TYPE(opline) & (IS_VAR | IS_TMP_VAR)) {
currT = VAR_NUM(ZEND_RESULT(opline).var) - offset;
if (valid_T[currT]) {
if (start_of_T[currT] == opline) {
taken_T[map_T[currT]] = 0;
}
ZEND_RESULT(opline).var = NUM_VAR(map_T[currT] + offset);
} else { /* Au still needs to be assigned a T which is a bit dumb. Should consider changing Zend */
GET_AVAILABLE_T();
if (RESULT_UNUSED(opline)) {
taken_T[i] = 0;
} else {
/* Code which gets here is using a wrongly built opcode such as RECV() */
map_T[currT] = i;
valid_T[currT] = 1;
}
ZEND_RESULT(opline).var = NUM_VAR(i + offset);
}
}
if (var_to_free >= 0) {
taken_T[var_to_free] = 0;
var_to_free = -1;
}
opline--;
}
zend_arena_release(&ctx->arena, checkpoint);
op_array->T = max + 1;
}
void optimize_temporary_variables(zend_op_array *op_array, zend_optimizer_ctx *ctx)
{
int T = op_array->T;
int offset = op_array->last_var;
char *taken_T; /* T index in use */
zend_op **start_of_T; /* opline where T is first used */
char *valid_T; /* Is the map_T valid */
int *map_T; /* Map's the T to its new index */
zend_op *opline, *end;
int currT;
int i;
int max = -1;
int var_to_free = -1;
void *checkpoint = zend_arena_checkpoint(ctx->arena);
taken_T = (char *) zend_arena_alloc(&ctx->arena, T);
start_of_T = (zend_op **) zend_arena_alloc(&ctx->arena, T * sizeof(zend_op *));
valid_T = (char *) zend_arena_alloc(&ctx->arena, T);
map_T = (int *) zend_arena_alloc(&ctx->arena, T * sizeof(int));
end = op_array->opcodes;
opline = &op_array->opcodes[op_array->last - 1];
/* Find T definition points */
while (opline >= end) {
if (ZEND_RESULT_TYPE(opline) & (IS_VAR | IS_TMP_VAR)) {
start_of_T[VAR_NUM(ZEND_RESULT(opline).var) - offset] = opline;
}
opline--;
}
memset(valid_T, 0, T);
memset(taken_T, 0, T);
end = op_array->opcodes;
opline = &op_array->opcodes[op_array->last - 1];
while (opline >= end) {
if ((ZEND_OP1_TYPE(opline) & (IS_VAR | IS_TMP_VAR))) {
currT = VAR_NUM(ZEND_OP1(opline).var) - offset;
if (opline->opcode == ZEND_ROPE_END) {
int num = (((opline->extended_value + 1) * sizeof(zend_string*)) + (sizeof(zval) - 1)) / sizeof(zval);
int var;
var = max;
while (var >= 0 && !taken_T[var]) {
var--;
}
max = MAX(max, var + num);
var = var + 1;
map_T[currT] = var;
valid_T[currT] = 1;
taken_T[var] = 1;
ZEND_OP1(opline).var = NUM_VAR(var + offset);
while (num > 1) {
num--;
taken_T[var + num] = 1;
}
} else {
if (!valid_T[currT]) {
GET_AVAILABLE_T();
map_T[currT] = i;
valid_T[currT] = 1;
}
ZEND_OP1(opline).var = NUM_VAR(map_T[currT] + offset);
}
}
/* Skip OP_DATA */
if (opline->opcode == ZEND_OP_DATA &&
(opline-1)->opcode == ZEND_ASSIGN_DIM) {
opline--;
continue;
}
if ((ZEND_OP2_TYPE(opline) & (IS_VAR | IS_TMP_VAR))) {
currT = VAR_NUM(ZEND_OP2(opline).var) - offset;
if (!valid_T[currT]) {
GET_AVAILABLE_T();
map_T[currT] = i;
valid_T[currT] = 1;
}
ZEND_OP2(opline).var = NUM_VAR(map_T[currT] + offset);
}
if (opline->opcode == ZEND_DECLARE_INHERITED_CLASS ||
opline->opcode == ZEND_DECLARE_ANON_INHERITED_CLASS ||
opline->opcode == ZEND_DECLARE_INHERITED_CLASS_DELAYED) {
currT = VAR_NUM(opline->extended_value) - offset;
if (!valid_T[currT]) {
GET_AVAILABLE_T();
map_T[currT] = i;
valid_T[currT] = 1;
}
opline->extended_value = NUM_VAR(map_T[currT] + offset);
}
/* Allocate OP_DATA->op2 after "operands", but before "result" */
if (opline->opcode == ZEND_ASSIGN_DIM &&
(opline + 1)->opcode == ZEND_OP_DATA &&
ZEND_OP2_TYPE(opline + 1) & (IS_VAR | IS_TMP_VAR)) {
currT = VAR_NUM(ZEND_OP2(opline + 1).var) - offset;
GET_AVAILABLE_T();
map_T[currT] = i;
valid_T[currT] = 1;
taken_T[i] = 0;
ZEND_OP2(opline + 1).var = NUM_VAR(i + offset);
var_to_free = i;
}
if (ZEND_RESULT_TYPE(opline) & (IS_VAR | IS_TMP_VAR)) {
currT = VAR_NUM(ZEND_RESULT(opline).var) - offset;
if (valid_T[currT]) {
if (start_of_T[currT] == opline) {
taken_T[map_T[currT]] = 0;
}
ZEND_RESULT(opline).var = NUM_VAR(map_T[currT] + offset);
if (opline->opcode == ZEND_ROPE_INIT) {
if (start_of_T[currT] == opline) {
uint32_t num = ((opline->extended_value * sizeof(zend_string*)) + (sizeof(zval) - 1)) / sizeof(zval);
while (num > 1) {
num--;
taken_T[map_T[currT]+num] = 0;
}
}
}
} else { /* Au still needs to be assigned a T which is a bit dumb. Should consider changing Zend */
GET_AVAILABLE_T();
if (RESULT_UNUSED(opline)) {
taken_T[i] = 0;
} else {
/* Code which gets here is using a wrongly built opcode such as RECV() */
map_T[currT] = i;
valid_T[currT] = 1;
}
ZEND_RESULT(opline).var = NUM_VAR(i + offset);
}
}
if (var_to_free >= 0) {
taken_T[var_to_free] = 0;
var_to_free = -1;
}
opline--;
}
zend_arena_release(&ctx->arena, checkpoint);
op_array->T = max + 1;
}
void zend_optimizer_pass1(zend_op_array *op_array, zend_optimizer_ctx *ctx)
{
int i = 0;
zend_op *opline = op_array->opcodes;
zend_op *end = opline + op_array->last;
zend_bool collect_constants = (op_array == &ctx->script->main_op_array);
while (opline < end) {
switch (opline->opcode) {
case ZEND_ADD:
case ZEND_SUB:
case ZEND_MUL:
case ZEND_DIV:
case ZEND_MOD:
case ZEND_POW:
case ZEND_SL:
case ZEND_SR:
case ZEND_CONCAT:
case ZEND_FAST_CONCAT:
case ZEND_IS_EQUAL:
case ZEND_IS_NOT_EQUAL:
case ZEND_IS_SMALLER:
case ZEND_IS_SMALLER_OR_EQUAL:
case ZEND_IS_IDENTICAL:
case ZEND_IS_NOT_IDENTICAL:
case ZEND_BW_OR:
case ZEND_BW_AND:
case ZEND_BW_XOR:
case ZEND_BOOL_XOR:
if (ZEND_OP1_TYPE(opline) == IS_CONST &&
ZEND_OP2_TYPE(opline) == IS_CONST) {
/* binary operation with constant operands */
binary_op_type binary_op = get_binary_op(opline->opcode);
uint32_t tv = ZEND_RESULT(opline).var; /* temporary variable */
zval result;
int er;
if (opline->opcode == ZEND_DIV &&
Z_TYPE(ZEND_OP2_LITERAL(opline)) == IS_LONG &&
Z_LVAL(ZEND_OP2_LITERAL(opline)) == 0) {
/* div by 0 */
break;
}
er = EG(error_reporting);
EG(error_reporting) = 0;
/* evaluate constant expression */
if (binary_op(&result, &ZEND_OP1_LITERAL(opline), &ZEND_OP2_LITERAL(opline)) != SUCCESS) {
EG(error_reporting) = er;
break;
}
EG(error_reporting) = er;
if (zend_optimizer_replace_by_const(op_array, opline + 1, IS_TMP_VAR, tv, &result)) {
literal_dtor(&ZEND_OP1_LITERAL(opline));
literal_dtor(&ZEND_OP2_LITERAL(opline));
MAKE_NOP(opline);
}
}
break;
case ZEND_CAST:
if (ZEND_OP1_TYPE(opline) == IS_CONST &&
opline->extended_value != IS_ARRAY &&
opline->extended_value != IS_OBJECT &&
opline->extended_value != IS_RESOURCE) {
/* cast of constant operand */
zend_uchar type = opline->result_type;
uint32_t tv = ZEND_RESULT(opline).var; /* temporary variable */
zval res;
res = ZEND_OP1_LITERAL(opline);
zval_copy_ctor(&res);
switch (opline->extended_value) {
case IS_NULL:
convert_to_null(&res);
break;
case _IS_BOOL:
convert_to_boolean(&res);
break;
case IS_LONG:
convert_to_long(&res);
break;
case IS_DOUBLE:
convert_to_double(&res);
break;
case IS_STRING:
convert_to_string(&res);
break;
}
if (zend_optimizer_replace_by_const(op_array, opline + 1, type, tv, &res)) {
literal_dtor(&ZEND_OP1_LITERAL(opline));
MAKE_NOP(opline);
}
} else if (opline->extended_value == _IS_BOOL) {
/* T = CAST(X, IS_BOOL) => T = BOOL(X) */
opline->opcode = ZEND_BOOL;
opline->extended_value = 0;
}
break;
case ZEND_BW_NOT:
case ZEND_BOOL_NOT:
if (ZEND_OP1_TYPE(opline) == IS_CONST) {
/* unary operation on constant operand */
unary_op_type unary_op = get_unary_op(opline->opcode);
zval result;
uint32_t tv = ZEND_RESULT(opline).var; /* temporary variable */
int er;
er = EG(error_reporting);
EG(error_reporting) = 0;
if (unary_op(&result, &ZEND_OP1_LITERAL(opline)) != SUCCESS) {
EG(error_reporting) = er;
break;
}
EG(error_reporting) = er;
if (zend_optimizer_replace_by_const(op_array, opline + 1, IS_TMP_VAR, tv, &result)) {
literal_dtor(&ZEND_OP1_LITERAL(opline));
MAKE_NOP(opline);
}
}
break;
#if 0
case ZEND_ADD_STRING:
case ZEND_ADD_CHAR:
{
zend_op *next_op = opline + 1;
int requires_conversion = (opline->opcode == ZEND_ADD_CHAR? 1 : 0);
size_t final_length = 0;
zend_string *str;
char *ptr;
zend_op *last_op;
/* There is always a ZEND_RETURN at the end
if (next_op>=end) {
break;
}
*/
while (next_op->opcode == ZEND_ADD_STRING || next_op->opcode == ZEND_ADD_CHAR) {
if (ZEND_RESULT(opline).var != ZEND_RESULT(next_op).var) {
break;
}
if (next_op->opcode == ZEND_ADD_CHAR) {
final_length += 1;
} else { /* ZEND_ADD_STRING */
final_length += Z_STRLEN(ZEND_OP2_LITERAL(next_op));
}
next_op++;
}
if (final_length == 0) {
break;
}
last_op = next_op;
final_length += (requires_conversion? 1 : Z_STRLEN(ZEND_OP2_LITERAL(opline)));
str = zend_string_alloc(final_length, 0);
str->len = final_length;
ptr = str->val;
ptr[final_length] = '\0';
if (requires_conversion) { /* ZEND_ADD_CHAR */
char chval = (char)Z_LVAL(ZEND_OP2_LITERAL(opline));
ZVAL_NEW_STR(&ZEND_OP2_LITERAL(opline), str);
ptr[0] = chval;
opline->opcode = ZEND_ADD_STRING;
ptr++;
} else { /* ZEND_ADD_STRING */
memcpy(ptr, Z_STRVAL(ZEND_OP2_LITERAL(opline)), Z_STRLEN(ZEND_OP2_LITERAL(opline)));
ptr += Z_STRLEN(ZEND_OP2_LITERAL(opline));
zend_string_release(Z_STR(ZEND_OP2_LITERAL(opline)));
ZVAL_NEW_STR(&ZEND_OP2_LITERAL(opline), str);
}
next_op = opline + 1;
while (next_op < last_op) {
if (next_op->opcode == ZEND_ADD_STRING) {
memcpy(ptr, Z_STRVAL(ZEND_OP2_LITERAL(next_op)), Z_STRLEN(ZEND_OP2_LITERAL(next_op)));
ptr += Z_STRLEN(ZEND_OP2_LITERAL(next_op));
literal_dtor(&ZEND_OP2_LITERAL(next_op));
} else { /* ZEND_ADD_CHAR */
*ptr = (char)Z_LVAL(ZEND_OP2_LITERAL(next_op));
ptr++;
}
MAKE_NOP(next_op);
next_op++;
}
if (!((ZEND_OPTIMIZER_PASS_5|ZEND_OPTIMIZER_PASS_10) & OPTIMIZATION_LEVEL)) {
/* NOP removal is disabled => insert JMP over NOPs */
if (last_op-opline >= 3) { /* If we have more than 2 NOPS then JMP over them */
(opline + 1)->opcode = ZEND_JMP;
ZEND_OP1(opline + 1).opline_num = last_op - op_array->opcodes; /* that's OK even for ZE2, since opline_num's are resolved in pass 2 later */
}
}
}
break;
#endif
case ZEND_FETCH_CONSTANT:
if (ZEND_OP1_TYPE(opline) == IS_UNUSED &&
ZEND_OP2_TYPE(opline) == IS_CONST &&
Z_TYPE(ZEND_OP2_LITERAL(opline)) == IS_STRING &&
Z_STRLEN(ZEND_OP2_LITERAL(opline)) == sizeof("__COMPILER_HALT_OFFSET__") - 1 &&
memcmp(Z_STRVAL(ZEND_OP2_LITERAL(opline)), "__COMPILER_HALT_OFFSET__", sizeof("__COMPILER_HALT_OFFSET__") - 1) == 0) {
/* substitute __COMPILER_HALT_OFFSET__ constant */
zend_execute_data *orig_execute_data = EG(current_execute_data);
zend_execute_data fake_execute_data;
zval *offset;
memset(&fake_execute_data, 0, sizeof(zend_execute_data));
fake_execute_data.func = (zend_function*)op_array;
EG(current_execute_data) = &fake_execute_data;
if ((offset = zend_get_constant_str("__COMPILER_HALT_OFFSET__", sizeof("__COMPILER_HALT_OFFSET__") - 1)) != NULL) {
uint32_t tv = ZEND_RESULT(opline).var;
if (zend_optimizer_replace_by_const(op_array, opline, IS_TMP_VAR, tv, offset)) {
literal_dtor(&ZEND_OP2_LITERAL(opline));
MAKE_NOP(opline);
}
}
EG(current_execute_data) = orig_execute_data;
break;
}
if (ZEND_OP1_TYPE(opline) == IS_UNUSED &&
ZEND_OP2_TYPE(opline) == IS_CONST &&
Z_TYPE(ZEND_OP2_LITERAL(opline)) == IS_STRING) {
/* substitute persistent constants */
uint32_t tv = ZEND_RESULT(opline).var;
zval c;
if (!zend_optimizer_get_persistent_constant(Z_STR(ZEND_OP2_LITERAL(opline)), &c, 1)) {
if (!ctx->constants || !zend_optimizer_get_collected_constant(ctx->constants, &ZEND_OP2_LITERAL(opline), &c)) {
break;
}
}
if (Z_TYPE(c) == IS_CONSTANT_AST) {
break;
}
if (zend_optimizer_replace_by_const(op_array, opline, IS_TMP_VAR, tv, &c)) {
literal_dtor(&ZEND_OP2_LITERAL(opline));
MAKE_NOP(opline);
}
}
/* class constant */
if (ZEND_OP1_TYPE(opline) != IS_UNUSED &&
ZEND_OP2_TYPE(opline) == IS_CONST &&
Z_TYPE(ZEND_OP2_LITERAL(opline)) == IS_STRING) {
zend_class_entry *ce = NULL;
if (ZEND_OP1_TYPE(opline) == IS_CONST &&
Z_TYPE(ZEND_OP1_LITERAL(opline)) == IS_STRING) {
/* for A::B */
if (op_array->scope &&
!strncasecmp(Z_STRVAL(ZEND_OP1_LITERAL(opline)),
op_array->scope->name->val, Z_STRLEN(ZEND_OP1_LITERAL(opline)) + 1)) {
ce = op_array->scope;
} else {
if ((ce = zend_hash_find_ptr(EG(class_table),
Z_STR(op_array->literals[opline->op1.constant + 1]))) == NULL ||
(ce->type == ZEND_INTERNAL_CLASS &&
ce->info.internal.module->type != MODULE_PERSISTENT) ||
(ce->type == ZEND_USER_CLASS &&
ZEND_CE_FILENAME(ce) != op_array->filename)) {
break;
}
}
} else if (op_array->scope &&
ZEND_OP1_TYPE(opline) == IS_VAR &&
(opline - 1)->opcode == ZEND_FETCH_CLASS &&
(ZEND_OP1_TYPE(opline - 1) == IS_UNUSED &&
((opline - 1)->extended_value & ~ZEND_FETCH_CLASS_NO_AUTOLOAD) == ZEND_FETCH_CLASS_SELF) &&
ZEND_RESULT((opline - 1)).var == ZEND_OP1(opline).var) {
/* for self::B */
ce = op_array->scope;
}
if (ce) {
uint32_t tv = ZEND_RESULT(opline).var;
zval *c, t;
if ((c = zend_hash_find(&ce->constants_table,
Z_STR(ZEND_OP2_LITERAL(opline)))) != NULL) {
ZVAL_DEREF(c);
if (Z_TYPE_P(c) == IS_CONSTANT_AST) {
break;
}
if (ZEND_IS_CONSTANT_TYPE(Z_TYPE_P(c))) {
if (!zend_optimizer_get_persistent_constant(Z_STR_P(c), &t, 1) ||
ZEND_IS_CONSTANT_TYPE(Z_TYPE(t))) {
break;
}
} else {
ZVAL_COPY_VALUE(&t, c);
zval_copy_ctor(&t);
}
if (ZEND_OP1_TYPE(opline) == IS_CONST) {
literal_dtor(&ZEND_OP1_LITERAL(opline));
} else {
MAKE_NOP((opline - 1));
}
if (zend_optimizer_replace_by_const(op_array, opline, IS_TMP_VAR, tv, &t)) {
literal_dtor(&ZEND_OP2_LITERAL(opline));
MAKE_NOP(opline);
}
}
}
}
break;
case ZEND_DO_ICALL: {
zend_op *send1_opline = opline - 1;
zend_op *send2_opline = NULL;
zend_op *init_opline = NULL;
while (send1_opline->opcode == ZEND_NOP) {
send1_opline--;
}
if (send1_opline->opcode != ZEND_SEND_VAL ||
ZEND_OP1_TYPE(send1_opline) != IS_CONST) {
/* don't colllect constants after unknown function call */
collect_constants = 0;
break;
}
if (send1_opline->op2.num == 2) {
send2_opline = send1_opline;
send1_opline--;
while (send1_opline->opcode == ZEND_NOP) {
send1_opline--;
}
if (send1_opline->opcode != ZEND_SEND_VAL ||
ZEND_OP1_TYPE(send1_opline) != IS_CONST) {
/* don't colllect constants after unknown function call */
collect_constants = 0;
break;
}
}
init_opline = send1_opline - 1;
while (init_opline->opcode == ZEND_NOP) {
init_opline--;
}
if (init_opline->opcode != ZEND_INIT_FCALL ||
ZEND_OP2_TYPE(init_opline) != IS_CONST ||
Z_TYPE(ZEND_OP2_LITERAL(init_opline)) != IS_STRING) {
/* don't colllect constants after unknown function call */
collect_constants = 0;
break;
}
/* define("name", scalar); */
if (Z_STRLEN(ZEND_OP2_LITERAL(init_opline)) == sizeof("define")-1 &&
zend_binary_strcasecmp(Z_STRVAL(ZEND_OP2_LITERAL(init_opline)), Z_STRLEN(ZEND_OP2_LITERAL(init_opline)), "define", sizeof("define")-1) == 0) {
if (Z_TYPE(ZEND_OP1_LITERAL(send1_opline)) == IS_STRING &&
send2_opline &&
Z_TYPE(ZEND_OP1_LITERAL(send2_opline)) <= IS_STRING) {
if (collect_constants) {
zend_optimizer_collect_constant(ctx, &ZEND_OP1_LITERAL(send1_opline), &ZEND_OP1_LITERAL(send2_opline));
}
if (RESULT_UNUSED(opline) &&
!zend_memnstr(Z_STRVAL(ZEND_OP1_LITERAL(send1_opline)), "::", sizeof("::") - 1, Z_STRVAL(ZEND_OP1_LITERAL(send1_opline)) + Z_STRLEN(ZEND_OP1_LITERAL(send1_opline)))) {
opline->opcode = ZEND_DECLARE_CONST;
opline->op1_type = IS_CONST;
opline->op2_type = IS_CONST;
opline->result_type = IS_UNUSED;
opline->op1.constant = send1_opline->op1.constant;
opline->op2.constant = send2_opline->op1.constant;
opline->result.num = 0;
literal_dtor(&ZEND_OP2_LITERAL(init_opline));
MAKE_NOP(init_opline);
MAKE_NOP(send1_opline);
MAKE_NOP(send2_opline);
}
break;
}
}
/* pre-evaluate constant functions:
defined(x)
constant(x)
function_exists(x)
is_callable(x)
extension_loaded(x)
*/
if (!send2_opline &&
Z_TYPE(ZEND_OP1_LITERAL(send1_opline)) == IS_STRING) {
if ((Z_STRLEN(ZEND_OP2_LITERAL(init_opline)) == sizeof("function_exists")-1 &&
!memcmp(Z_STRVAL(ZEND_OP2_LITERAL(init_opline)),
"function_exists", sizeof("function_exists")-1)) ||
(Z_STRLEN(ZEND_OP2_LITERAL(init_opline)) == sizeof("is_callable")-1 &&
!memcmp(Z_STRVAL(ZEND_OP2_LITERAL(init_opline)),
"is_callable", sizeof("is_callable")))) {
zend_internal_function *func;
zend_string *lc_name = zend_string_tolower(
Z_STR(ZEND_OP1_LITERAL(send1_opline)));
if ((func = zend_hash_find_ptr(EG(function_table), lc_name)) != NULL &&
func->type == ZEND_INTERNAL_FUNCTION &&
func->module->type == MODULE_PERSISTENT) {
zval t;
if (Z_STRLEN(ZEND_OP2_LITERAL(init_opline)) == sizeof("is_callable") - 1 ||
func->handler != ZEND_FN(display_disabled_function)) {
ZVAL_TRUE(&t);
} else {
ZVAL_FALSE(&t);
}
if (zend_optimizer_replace_by_const(op_array, opline + 1, IS_VAR, ZEND_RESULT(opline).var, &t)) {
literal_dtor(&ZEND_OP2_LITERAL(init_opline));
MAKE_NOP(init_opline);
literal_dtor(&ZEND_OP1_LITERAL(send1_opline));
MAKE_NOP(send1_opline);
MAKE_NOP(opline);
zend_string_release(lc_name);
break;
}
}
zend_string_release(lc_name);
} else if (Z_STRLEN(ZEND_OP2_LITERAL(init_opline)) == sizeof("extension_loaded")-1 &&
!memcmp(Z_STRVAL(ZEND_OP2_LITERAL(init_opline)),
"extension_loaded", sizeof("extension_loaded")-1)) {
zval t;
zend_string *lc_name = zend_string_tolower(
Z_STR(ZEND_OP1_LITERAL(send1_opline)));
zend_module_entry *m = zend_hash_find_ptr(&module_registry,
lc_name);
zend_string_release(lc_name);
if (!m) {
if (!PG(enable_dl)) {
break;
} else {
ZVAL_FALSE(&t);
}
} else {
if (m->type == MODULE_PERSISTENT) {
ZVAL_TRUE(&t);
} else {
break;
}
}
if (zend_optimizer_replace_by_const(op_array, opline + 1, IS_VAR, ZEND_RESULT(opline).var, &t)) {
literal_dtor(&ZEND_OP2_LITERAL(init_opline));
MAKE_NOP(init_opline);
literal_dtor(&ZEND_OP1_LITERAL(send1_opline));
MAKE_NOP(send1_opline);
MAKE_NOP(opline);
break;
}
} else if (Z_STRLEN(ZEND_OP2_LITERAL(init_opline)) == sizeof("defined")-1 &&
!memcmp(Z_STRVAL(ZEND_OP2_LITERAL(init_opline)),
"defined", sizeof("defined")-1)) {
zval t;
if (zend_optimizer_get_persistent_constant(Z_STR(ZEND_OP1_LITERAL(send1_opline)), &t, 0)) {
ZVAL_TRUE(&t);
if (zend_optimizer_replace_by_const(op_array, opline + 1, IS_VAR, ZEND_RESULT(opline).var, &t)) {
literal_dtor(&ZEND_OP2_LITERAL(init_opline));
MAKE_NOP(init_opline);
literal_dtor(&ZEND_OP1_LITERAL(send1_opline));
MAKE_NOP(send1_opline);
MAKE_NOP(opline);
break;
}
}
} else if (Z_STRLEN(ZEND_OP2_LITERAL(init_opline)) == sizeof("constant")-1 &&
!memcmp(Z_STRVAL(ZEND_OP2_LITERAL(init_opline)),
"constant", sizeof("constant")-1)) {
zval t;
if (zend_optimizer_get_persistent_constant(Z_STR(ZEND_OP1_LITERAL(send1_opline)), &t, 1)) {
if (zend_optimizer_replace_by_const(op_array, opline + 1, IS_VAR, ZEND_RESULT(opline).var, &t)) {
literal_dtor(&ZEND_OP2_LITERAL(init_opline));
MAKE_NOP(init_opline);
literal_dtor(&ZEND_OP1_LITERAL(send1_opline));
MAKE_NOP(send1_opline);
MAKE_NOP(opline);
break;
}
}
} else if ((CG(compiler_options) & ZEND_COMPILE_NO_BUILTIN_STRLEN) == 0 &&
Z_STRLEN(ZEND_OP2_LITERAL(init_opline)) == sizeof("strlen") - 1 &&
!memcmp(Z_STRVAL(ZEND_OP2_LITERAL(init_opline)), "strlen", sizeof("strlen") - 1)) {
zval t;
ZVAL_LONG(&t, Z_STRLEN(ZEND_OP1_LITERAL(send1_opline)));
if (zend_optimizer_replace_by_const(op_array, opline + 1, IS_VAR, ZEND_RESULT(opline).var, &t)) {
literal_dtor(&ZEND_OP2_LITERAL(init_opline));
MAKE_NOP(init_opline);
literal_dtor(&ZEND_OP1_LITERAL(send1_opline));
MAKE_NOP(send1_opline);
MAKE_NOP(opline);
break;
}
/* dirname(IS_CONST/IS_STRING) -> IS_CONST/IS_STRING */
} else if (Z_STRLEN(ZEND_OP2_LITERAL(init_opline)) == sizeof("dirname")-1 &&
!memcmp(Z_STRVAL(ZEND_OP2_LITERAL(init_opline)),
"dirname", sizeof("dirname")-1) &&
IS_ABSOLUTE_PATH(Z_STRVAL(ZEND_OP1_LITERAL(send1_opline)), Z_STRLEN(ZEND_OP1_LITERAL(send1_opline)))) {
zend_string *dirname = zend_string_init(Z_STRVAL(ZEND_OP1_LITERAL(send1_opline)), Z_STRLEN(ZEND_OP1_LITERAL(send1_opline)), 0);
dirname->len = zend_dirname(dirname->val, dirname->len);
if (IS_ABSOLUTE_PATH(dirname->val, dirname->len)) {
zval t;
ZVAL_STR(&t, dirname);
if (zend_optimizer_replace_by_const(op_array, opline + 1, IS_VAR, ZEND_RESULT(opline).var, &t)) {
literal_dtor(&ZEND_OP2_LITERAL(init_opline));
MAKE_NOP(init_opline);
literal_dtor(&ZEND_OP1_LITERAL(send1_opline));
MAKE_NOP(send1_opline);
MAKE_NOP(opline);
break;
}
} else {
zend_string_release(dirname);
}
}
}
/* don't colllect constants after any other function call */
collect_constants = 0;
break;
}
case ZEND_STRLEN:
if (ZEND_OP1_TYPE(opline) == IS_CONST &&
Z_TYPE(ZEND_OP1_LITERAL(opline)) == IS_STRING) {
zval t;
ZVAL_LONG(&t, Z_STRLEN(ZEND_OP1_LITERAL(opline)));
if (zend_optimizer_replace_by_const(op_array, opline + 1, IS_TMP_VAR, ZEND_RESULT(opline).var, &t)) {
literal_dtor(&ZEND_OP1_LITERAL(opline));
MAKE_NOP(opline);
}
}
break;
case ZEND_DEFINED:
{
zval c;
uint32_t tv = ZEND_RESULT(opline).var;
if (!zend_optimizer_get_persistent_constant(Z_STR(ZEND_OP1_LITERAL(opline)), &c, 0)) {
break;
}
ZVAL_TRUE(&c);
if (zend_optimizer_replace_by_const(op_array, opline, IS_TMP_VAR, tv, &c)) {
literal_dtor(&ZEND_OP1_LITERAL(opline));
MAKE_NOP(opline);
}
}
break;
case ZEND_DECLARE_CONST:
if (collect_constants &&
Z_TYPE(ZEND_OP1_LITERAL(opline)) == IS_STRING &&
Z_TYPE(ZEND_OP2_LITERAL(opline)) <= IS_STRING) {
zend_optimizer_collect_constant(ctx, &ZEND_OP1_LITERAL(opline), &ZEND_OP2_LITERAL(opline));
}
break;
case ZEND_RETURN:
case ZEND_RETURN_BY_REF:
case ZEND_GENERATOR_RETURN:
case ZEND_EXIT:
case ZEND_THROW:
case ZEND_CATCH:
case ZEND_BRK:
case ZEND_CONT:
case ZEND_GOTO:
case ZEND_FAST_CALL:
case ZEND_FAST_RET:
case ZEND_JMP:
case ZEND_JMPZNZ:
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_FE_FETCH_R:
case ZEND_FE_FETCH_RW:
case ZEND_NEW:
case ZEND_JMP_SET:
case ZEND_COALESCE:
case ZEND_ASSERT_CHECK:
collect_constants = 0;
break;
case ZEND_FETCH_R:
case ZEND_FETCH_W:
case ZEND_FETCH_RW:
case ZEND_FETCH_FUNC_ARG:
case ZEND_FETCH_IS:
case ZEND_FETCH_UNSET:
if (opline != op_array->opcodes &&
(opline-1)->opcode == ZEND_BEGIN_SILENCE &&
(opline->extended_value & ZEND_FETCH_TYPE_MASK) == ZEND_FETCH_LOCAL &&
opline->op1_type == IS_CONST &&
opline->op2_type == IS_UNUSED &&
Z_TYPE(ZEND_OP1_LITERAL(opline)) == IS_STRING &&
(Z_STRLEN(ZEND_OP1_LITERAL(opline)) != sizeof("this")-1 ||
memcmp(Z_STRVAL(ZEND_OP1_LITERAL(opline)), "this", sizeof("this") - 1) != 0)) {
int var = opline->result.var;
int level = 0;
zend_op *op = opline + 1;
zend_op *use = NULL;
while (op < end) {
if (op->opcode == ZEND_BEGIN_SILENCE) {
level++;
} else if (op->opcode == ZEND_END_SILENCE) {
if (level == 0) {
break;
} else {
level--;
}
}
if (op->op1_type == IS_VAR && op->op1.var == var) {
if (use) {
/* used more than once */
use = NULL;
break;
}
use = op;
} else if (op->op2_type == IS_VAR && op->op2.var == var) {
if (use) {
/* used more than once */
use = NULL;
break;
}
use = op;
}
op++;
}
if (use) {
if (use->op1_type == IS_VAR && use->op1.var == var) {
use->op1_type = IS_CV;
use->op1.var = zend_optimizer_lookup_cv(op_array,
Z_STR(ZEND_OP1_LITERAL(opline)));
MAKE_NOP(opline);
} else if (use->op2_type == IS_VAR && use->op2.var == var) {
use->op2_type = IS_CV;
use->op2.var = zend_optimizer_lookup_cv(op_array,
Z_STR(ZEND_OP1_LITERAL(opline)));
MAKE_NOP(opline);
}
}
}
break;
}
opline++;
i++;
}
}
void zend_optimizer_pass1(zend_op_array *op_array, zend_optimizer_ctx *ctx)
{
int i = 0;
zend_op *opline = op_array->opcodes;
zend_op *end = opline + op_array->last;
zend_bool collect_constants = (ZEND_OPTIMIZER_PASS_15 & ctx->optimization_level)?
(op_array == &ctx->script->main_op_array) : 0;
while (opline < end) {
switch (opline->opcode) {
case ZEND_ADD:
case ZEND_SUB:
case ZEND_MUL:
case ZEND_DIV:
case ZEND_MOD:
case ZEND_POW:
case ZEND_SL:
case ZEND_SR:
case ZEND_CONCAT:
case ZEND_FAST_CONCAT:
case ZEND_IS_EQUAL:
case ZEND_IS_NOT_EQUAL:
case ZEND_IS_SMALLER:
case ZEND_IS_SMALLER_OR_EQUAL:
case ZEND_IS_IDENTICAL:
case ZEND_IS_NOT_IDENTICAL:
case ZEND_BW_OR:
case ZEND_BW_AND:
case ZEND_BW_XOR:
case ZEND_BOOL_XOR:
case ZEND_SPACESHIP:
case ZEND_CASE:
if (opline->op1_type == IS_CONST &&
opline->op2_type == IS_CONST) {
/* binary operation with constant operands */
zval result;
if (zend_optimizer_eval_binary_op(&result, opline->opcode, &ZEND_OP1_LITERAL(opline), &ZEND_OP2_LITERAL(opline)) == SUCCESS) {
literal_dtor(&ZEND_OP1_LITERAL(opline));
literal_dtor(&ZEND_OP2_LITERAL(opline));
if (zend_optimizer_replace_by_const(op_array, opline + 1, IS_TMP_VAR, opline->result.var, &result)) {
MAKE_NOP(opline);
} else {
opline->opcode = ZEND_QM_ASSIGN;
SET_UNUSED(opline->op2);
zend_optimizer_update_op1_const(op_array, opline, &result);
}
}
}
break;
case ZEND_CAST:
if (opline->op1_type == IS_CONST) {
/* cast of constant operand */
zval result;
if (zend_optimizer_eval_cast(&result, opline->extended_value, &ZEND_OP1_LITERAL(opline)) == SUCCESS) {
literal_dtor(&ZEND_OP1_LITERAL(opline));
if (zend_optimizer_replace_by_const(op_array, opline + 1, opline->result_type, opline->result.var, &result)) {
MAKE_NOP(opline);
} else {
opline->opcode = ZEND_QM_ASSIGN;
opline->extended_value = 0;
zend_optimizer_update_op1_const(op_array, opline, &result);
}
break;
}
}
if (opline->extended_value == _IS_BOOL) {
/* T = CAST(X, IS_BOOL) => T = BOOL(X) */
opline->opcode = ZEND_BOOL;
opline->extended_value = 0;
}
break;
case ZEND_BW_NOT:
case ZEND_BOOL_NOT:
if (opline->op1_type == IS_CONST) {
/* unary operation on constant operand */
zval result;
if (zend_optimizer_eval_unary_op(&result, opline->opcode, &ZEND_OP1_LITERAL(opline)) == SUCCESS) {
literal_dtor(&ZEND_OP1_LITERAL(opline));
if (zend_optimizer_replace_by_const(op_array, opline + 1, IS_TMP_VAR, opline->result.var, &result)) {
MAKE_NOP(opline);
} else {
opline->opcode = ZEND_QM_ASSIGN;
zend_optimizer_update_op1_const(op_array, opline, &result);
}
}
}
break;
case ZEND_FETCH_CONSTANT:
if (opline->op2_type == IS_CONST &&
Z_TYPE(ZEND_OP2_LITERAL(opline)) == IS_STRING &&
Z_STRLEN(ZEND_OP2_LITERAL(opline)) == sizeof("__COMPILER_HALT_OFFSET__") - 1 &&
memcmp(Z_STRVAL(ZEND_OP2_LITERAL(opline)), "__COMPILER_HALT_OFFSET__", sizeof("__COMPILER_HALT_OFFSET__") - 1) == 0) {
/* substitute __COMPILER_HALT_OFFSET__ constant */
zend_execute_data *orig_execute_data = EG(current_execute_data);
zend_execute_data fake_execute_data;
zval *offset;
memset(&fake_execute_data, 0, sizeof(zend_execute_data));
fake_execute_data.func = (zend_function*)op_array;
EG(current_execute_data) = &fake_execute_data;
if ((offset = zend_get_constant_str("__COMPILER_HALT_OFFSET__", sizeof("__COMPILER_HALT_OFFSET__") - 1)) != NULL) {
literal_dtor(&ZEND_OP2_LITERAL(opline));
if (zend_optimizer_replace_by_const(op_array, opline, IS_TMP_VAR, opline->result.var, offset)) {
MAKE_NOP(opline);
} else {
opline->opcode = ZEND_QM_ASSIGN;
opline->extended_value = 0;
SET_UNUSED(opline->op2);
zend_optimizer_update_op1_const(op_array, opline, offset);
}
}
EG(current_execute_data) = orig_execute_data;
break;
}
if (opline->op2_type == IS_CONST &&
Z_TYPE(ZEND_OP2_LITERAL(opline)) == IS_STRING) {
/* substitute persistent constants */
zval c;
if (!zend_optimizer_get_persistent_constant(Z_STR(ZEND_OP2_LITERAL(opline)), &c, 1)) {
if (!ctx->constants || !zend_optimizer_get_collected_constant(ctx->constants, &ZEND_OP2_LITERAL(opline), &c)) {
break;
}
}
if (Z_TYPE(c) == IS_CONSTANT_AST) {
break;
}
literal_dtor(&ZEND_OP2_LITERAL(opline));
if (zend_optimizer_replace_by_const(op_array, opline, IS_TMP_VAR, opline->result.var, &c)) {
MAKE_NOP(opline);
} else {
opline->opcode = ZEND_QM_ASSIGN;
opline->extended_value = 0;
SET_UNUSED(opline->op2);
zend_optimizer_update_op1_const(op_array, opline, &c);
}
}
break;
case ZEND_FETCH_CLASS_CONSTANT:
if (opline->op2_type == IS_CONST &&
Z_TYPE(ZEND_OP2_LITERAL(opline)) == IS_STRING) {
zend_class_entry *ce = NULL;
if (opline->op1_type == IS_CONST &&
Z_TYPE(ZEND_OP1_LITERAL(opline)) == IS_STRING) {
/* for A::B */
if (op_array->scope &&
!strncasecmp(Z_STRVAL(ZEND_OP1_LITERAL(opline)),
ZSTR_VAL(op_array->scope->name), Z_STRLEN(ZEND_OP1_LITERAL(opline)) + 1)) {
ce = op_array->scope;
} else {
if ((ce = zend_hash_find_ptr(EG(class_table),
Z_STR(op_array->literals[opline->op1.constant + 1]))) == NULL ||
(ce->type == ZEND_INTERNAL_CLASS &&
ce->info.internal.module->type != MODULE_PERSISTENT) ||
(ce->type == ZEND_USER_CLASS &&
ce->info.user.filename != op_array->filename)) {
break;
}
}
} else if (op_array->scope &&
opline->op1_type == IS_UNUSED &&
(opline->op1.num & ZEND_FETCH_CLASS_MASK) == ZEND_FETCH_CLASS_SELF) {
/* for self::B */
ce = op_array->scope;
} else if (op_array->scope &&
opline->op1_type == IS_VAR &&
(opline - 1)->opcode == ZEND_FETCH_CLASS &&
((opline - 1)->op2_type == IS_UNUSED &&
((opline - 1)->op1.num & ZEND_FETCH_CLASS_MASK) == ZEND_FETCH_CLASS_SELF) &&
(opline - 1)->result.var == opline->op1.var) {
/* for self::B */
ce = op_array->scope;
}
if (ce) {
zend_class_constant *cc;
zval *c, t;
if ((cc = zend_hash_find_ptr(&ce->constants_table,
Z_STR(ZEND_OP2_LITERAL(opline)))) != NULL &&
(Z_ACCESS_FLAGS(cc->value) & ZEND_ACC_PPP_MASK) == ZEND_ACC_PUBLIC) {
c = &cc->value;
if (Z_TYPE_P(c) == IS_CONSTANT_AST) {
zend_ast *ast = Z_ASTVAL_P(c);
if (ast->kind != ZEND_AST_CONSTANT
|| !zend_optimizer_get_persistent_constant(zend_ast_get_constant_name(ast), &t, 1)
|| Z_TYPE(t) == IS_CONSTANT_AST) {
break;
}
} else {
ZVAL_COPY_OR_DUP(&t, c);
}
if (opline->op1_type == IS_CONST) {
literal_dtor(&ZEND_OP1_LITERAL(opline));
} else if (opline->op1_type == IS_VAR) {
MAKE_NOP((opline - 1));
}
literal_dtor(&ZEND_OP2_LITERAL(opline));
if (zend_optimizer_replace_by_const(op_array, opline, IS_TMP_VAR, opline->result.var, &t)) {
MAKE_NOP(opline);
} else {
opline->opcode = ZEND_QM_ASSIGN;
opline->extended_value = 0;
SET_UNUSED(opline->op2);
zend_optimizer_update_op1_const(op_array, opline, &t);
}
}
}
}
break;
case ZEND_DO_ICALL: {
zend_op *send1_opline = opline - 1;
zend_op *send2_opline = NULL;
zend_op *init_opline = NULL;
while (send1_opline->opcode == ZEND_NOP) {
send1_opline--;
}
if (send1_opline->opcode != ZEND_SEND_VAL ||
send1_opline->op1_type != IS_CONST) {
/* don't colllect constants after unknown function call */
collect_constants = 0;
break;
}
if (send1_opline->op2.num == 2) {
send2_opline = send1_opline;
send1_opline--;
while (send1_opline->opcode == ZEND_NOP) {
send1_opline--;
}
if (send1_opline->opcode != ZEND_SEND_VAL ||
send1_opline->op1_type != IS_CONST) {
/* don't colllect constants after unknown function call */
collect_constants = 0;
break;
}
}
init_opline = send1_opline - 1;
while (init_opline->opcode == ZEND_NOP) {
init_opline--;
}
if (init_opline->opcode != ZEND_INIT_FCALL ||
init_opline->op2_type != IS_CONST ||
Z_TYPE(ZEND_OP2_LITERAL(init_opline)) != IS_STRING) {
/* don't colllect constants after unknown function call */
collect_constants = 0;
break;
}
/* define("name", scalar); */
if (Z_STRLEN(ZEND_OP2_LITERAL(init_opline)) == sizeof("define")-1 &&
zend_binary_strcasecmp(Z_STRVAL(ZEND_OP2_LITERAL(init_opline)), Z_STRLEN(ZEND_OP2_LITERAL(init_opline)), "define", sizeof("define")-1) == 0) {
if (Z_TYPE(ZEND_OP1_LITERAL(send1_opline)) == IS_STRING &&
send2_opline &&
Z_TYPE(ZEND_OP1_LITERAL(send2_opline)) <= IS_STRING) {
if (collect_constants) {
zend_optimizer_collect_constant(ctx, &ZEND_OP1_LITERAL(send1_opline), &ZEND_OP1_LITERAL(send2_opline));
}
if (RESULT_UNUSED(opline) &&
!zend_memnstr(Z_STRVAL(ZEND_OP1_LITERAL(send1_opline)), "::", sizeof("::") - 1, Z_STRVAL(ZEND_OP1_LITERAL(send1_opline)) + Z_STRLEN(ZEND_OP1_LITERAL(send1_opline)))) {
opline->opcode = ZEND_DECLARE_CONST;
opline->op1_type = IS_CONST;
opline->op2_type = IS_CONST;
opline->result_type = IS_UNUSED;
opline->op1.constant = send1_opline->op1.constant;
opline->op2.constant = send2_opline->op1.constant;
opline->result.num = 0;
literal_dtor(&ZEND_OP2_LITERAL(init_opline));
MAKE_NOP(init_opline);
MAKE_NOP(send1_opline);
MAKE_NOP(send2_opline);
}
break;
}
}
/* pre-evaluate constant functions:
constant(x)
function_exists(x)
is_callable(x)
extension_loaded(x)
*/
if (!send2_opline &&
Z_TYPE(ZEND_OP1_LITERAL(send1_opline)) == IS_STRING) {
if ((Z_STRLEN(ZEND_OP2_LITERAL(init_opline)) == sizeof("function_exists")-1 &&
!memcmp(Z_STRVAL(ZEND_OP2_LITERAL(init_opline)),
"function_exists", sizeof("function_exists")-1) &&
!zend_optimizer_is_disabled_func("function_exists", sizeof("function_exists") - 1)) ||
(Z_STRLEN(ZEND_OP2_LITERAL(init_opline)) == sizeof("is_callable")-1 &&
!memcmp(Z_STRVAL(ZEND_OP2_LITERAL(init_opline)),
"is_callable", sizeof("is_callable")) &&
!zend_optimizer_is_disabled_func("is_callable", sizeof("is_callable") - 1))) {
zend_internal_function *func;
zend_string *lc_name = zend_string_tolower(
Z_STR(ZEND_OP1_LITERAL(send1_opline)));
if ((func = zend_hash_find_ptr(EG(function_table), lc_name)) != NULL
&& func->type == ZEND_INTERNAL_FUNCTION
&& func->module->type == MODULE_PERSISTENT
#ifdef ZEND_WIN32
&& func->module->handle == NULL
#endif
) {
zval t;
if (Z_STRLEN(ZEND_OP2_LITERAL(init_opline)) == sizeof("is_callable") - 1 ||
func->handler != ZEND_FN(display_disabled_function)) {
ZVAL_TRUE(&t);
} else {
ZVAL_FALSE(&t);
}
literal_dtor(&ZEND_OP2_LITERAL(init_opline));
MAKE_NOP(init_opline);
literal_dtor(&ZEND_OP1_LITERAL(send1_opline));
MAKE_NOP(send1_opline);
if (zend_optimizer_replace_by_const(op_array, opline + 1, IS_VAR, opline->result.var, &t)) {
MAKE_NOP(opline);
} else {
opline->opcode = ZEND_QM_ASSIGN;
opline->extended_value = 0;
SET_UNUSED(opline->op2);
zend_optimizer_update_op1_const(op_array, opline, &t);
}
}
zend_string_release_ex(lc_name, 0);
break;
} else if (Z_STRLEN(ZEND_OP2_LITERAL(init_opline)) == sizeof("extension_loaded")-1 &&
!memcmp(Z_STRVAL(ZEND_OP2_LITERAL(init_opline)),
"extension_loaded", sizeof("extension_loaded")-1) &&
!zend_optimizer_is_disabled_func("extension_loaded", sizeof("extension_loaded") - 1)) {
zval t;
zend_string *lc_name = zend_string_tolower(
Z_STR(ZEND_OP1_LITERAL(send1_opline)));
zend_module_entry *m = zend_hash_find_ptr(&module_registry,
lc_name);
zend_string_release_ex(lc_name, 0);
if (!m) {
if (PG(enable_dl)) {
break;
} else {
ZVAL_FALSE(&t);
}
} else {
if (m->type == MODULE_PERSISTENT
#ifdef ZEND_WIN32
&& m->handle == NULL
#endif
) {
ZVAL_TRUE(&t);
} else {
break;
}
}
literal_dtor(&ZEND_OP2_LITERAL(init_opline));
MAKE_NOP(init_opline);
literal_dtor(&ZEND_OP1_LITERAL(send1_opline));
MAKE_NOP(send1_opline);
if (zend_optimizer_replace_by_const(op_array, opline + 1, IS_VAR, opline->result.var, &t)) {
MAKE_NOP(opline);
} else {
opline->opcode = ZEND_QM_ASSIGN;
opline->extended_value = 0;
SET_UNUSED(opline->op2);
zend_optimizer_update_op1_const(op_array, opline, &t);
}
break;
} else if (Z_STRLEN(ZEND_OP2_LITERAL(init_opline)) == sizeof("constant")-1 &&
!memcmp(Z_STRVAL(ZEND_OP2_LITERAL(init_opline)),
"constant", sizeof("constant")-1) &&
!zend_optimizer_is_disabled_func("constant", sizeof("constant") - 1)) {
zval t;
if (zend_optimizer_get_persistent_constant(Z_STR(ZEND_OP1_LITERAL(send1_opline)), &t, 1)) {
literal_dtor(&ZEND_OP2_LITERAL(init_opline));
MAKE_NOP(init_opline);
literal_dtor(&ZEND_OP1_LITERAL(send1_opline));
MAKE_NOP(send1_opline);
if (zend_optimizer_replace_by_const(op_array, opline + 1, IS_VAR, opline->result.var, &t)) {
MAKE_NOP(opline);
} else {
opline->opcode = ZEND_QM_ASSIGN;
opline->extended_value = 0;
SET_UNUSED(opline->op2);
zend_optimizer_update_op1_const(op_array, opline, &t);
}
}
break;
/* dirname(IS_CONST/IS_STRING) -> IS_CONST/IS_STRING */
} else if (Z_STRLEN(ZEND_OP2_LITERAL(init_opline)) == sizeof("dirname")-1 &&
!memcmp(Z_STRVAL(ZEND_OP2_LITERAL(init_opline)),
"dirname", sizeof("dirname") - 1) &&
!zend_optimizer_is_disabled_func("dirname", sizeof("dirname") - 1) &&
IS_ABSOLUTE_PATH(Z_STRVAL(ZEND_OP1_LITERAL(send1_opline)), Z_STRLEN(ZEND_OP1_LITERAL(send1_opline)))) {
zend_string *dirname = zend_string_init(Z_STRVAL(ZEND_OP1_LITERAL(send1_opline)), Z_STRLEN(ZEND_OP1_LITERAL(send1_opline)), 0);
ZSTR_LEN(dirname) = zend_dirname(ZSTR_VAL(dirname), ZSTR_LEN(dirname));
if (IS_ABSOLUTE_PATH(ZSTR_VAL(dirname), ZSTR_LEN(dirname))) {
zval t;
ZVAL_STR(&t, dirname);
literal_dtor(&ZEND_OP2_LITERAL(init_opline));
MAKE_NOP(init_opline);
literal_dtor(&ZEND_OP1_LITERAL(send1_opline));
MAKE_NOP(send1_opline);
if (zend_optimizer_replace_by_const(op_array, opline + 1, IS_VAR, opline->result.var, &t)) {
MAKE_NOP(opline);
} else {
opline->opcode = ZEND_QM_ASSIGN;
opline->extended_value = 0;
SET_UNUSED(opline->op2);
zend_optimizer_update_op1_const(op_array, opline, &t);
}
} else {
zend_string_release_ex(dirname, 0);
}
break;
}
}
/* don't colllect constants after any other function call */
collect_constants = 0;
break;
}
case ZEND_STRLEN:
if (opline->op1_type == IS_CONST) {
zval t;
if (zend_optimizer_eval_strlen(&t, &ZEND_OP1_LITERAL(opline)) == SUCCESS) {
literal_dtor(&ZEND_OP1_LITERAL(opline));
if (zend_optimizer_replace_by_const(op_array, opline + 1, IS_TMP_VAR, opline->result.var, &t)) {
MAKE_NOP(opline);
} else {
opline->opcode = ZEND_QM_ASSIGN;
zend_optimizer_update_op1_const(op_array, opline, &t);
}
}
}
break;
case ZEND_DEFINED:
{
zval c;
if (!zend_optimizer_get_persistent_constant(Z_STR(ZEND_OP1_LITERAL(opline)), &c, 0)) {
break;
}
ZVAL_TRUE(&c);
literal_dtor(&ZEND_OP1_LITERAL(opline));
if (zend_optimizer_replace_by_const(op_array, opline, IS_TMP_VAR, opline->result.var, &c)) {
MAKE_NOP(opline);
} else {
opline->opcode = ZEND_QM_ASSIGN;
zend_optimizer_update_op1_const(op_array, opline, &c);
}
}
break;
case ZEND_DECLARE_CONST:
if (collect_constants &&
Z_TYPE(ZEND_OP1_LITERAL(opline)) == IS_STRING &&
Z_TYPE(ZEND_OP2_LITERAL(opline)) <= IS_STRING) {
zend_optimizer_collect_constant(ctx, &ZEND_OP1_LITERAL(opline), &ZEND_OP2_LITERAL(opline));
}
break;
case ZEND_RETURN:
case ZEND_RETURN_BY_REF:
case ZEND_GENERATOR_RETURN:
case ZEND_EXIT:
case ZEND_THROW:
case ZEND_CATCH:
case ZEND_FAST_CALL:
case ZEND_FAST_RET:
case ZEND_JMP:
case ZEND_JMPZNZ:
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_FE_FETCH_R:
case ZEND_FE_FETCH_RW:
case ZEND_JMP_SET:
case ZEND_COALESCE:
case ZEND_ASSERT_CHECK:
collect_constants = 0;
break;
}
opline++;
i++;
}
}
void optimize_temporary_variables(zend_op_array *op_array, zend_optimizer_ctx *ctx)
{
int T = op_array->T;
int offset = op_array->last_var;
uint32_t bitset_len;
zend_bitset taken_T; /* T index in use */
zend_op **start_of_T; /* opline where T is first used */
zend_bitset valid_T; /* Is the map_T valid */
int *map_T; /* Map's the T to its new index */
zend_op *opline, *end;
int currT;
int i;
int max = -1;
int var_to_free = -1;
void *checkpoint = zend_arena_checkpoint(ctx->arena);
bitset_len = zend_bitset_len(T);
taken_T = (zend_bitset) zend_arena_alloc(&ctx->arena, bitset_len * ZEND_BITSET_ELM_SIZE);
start_of_T = (zend_op **) zend_arena_alloc(&ctx->arena, T * sizeof(zend_op *));
valid_T = (zend_bitset) zend_arena_alloc(&ctx->arena, bitset_len * ZEND_BITSET_ELM_SIZE);
map_T = (int *) zend_arena_alloc(&ctx->arena, T * sizeof(int));
end = op_array->opcodes;
opline = &op_array->opcodes[op_array->last - 1];
/* Find T definition points */
while (opline >= end) {
if (ZEND_RESULT_TYPE(opline) & (IS_VAR | IS_TMP_VAR)) {
start_of_T[VAR_NUM(ZEND_RESULT(opline).var) - offset] = opline;
}
opline--;
}
zend_bitset_clear(valid_T, bitset_len);
zend_bitset_clear(taken_T, bitset_len);
end = op_array->opcodes;
opline = &op_array->opcodes[op_array->last - 1];
while (opline >= end) {
if ((ZEND_OP1_TYPE(opline) & (IS_VAR | IS_TMP_VAR))) {
currT = VAR_NUM(ZEND_OP1(opline).var) - offset;
if (opline->opcode == ZEND_ROPE_END) {
int num = (((opline->extended_value + 1) * sizeof(zend_string*)) + (sizeof(zval) - 1)) / sizeof(zval);
int var;
var = max;
while (var >= 0 && !zend_bitset_in(taken_T, var)) {
var--;
}
max = MAX(max, var + num);
var = var + 1;
map_T[currT] = var;
zend_bitset_incl(valid_T, currT);
zend_bitset_incl(taken_T, var);
ZEND_OP1(opline).var = NUM_VAR(var + offset);
while (num > 1) {
num--;
zend_bitset_incl(taken_T, var + num);
}
} else {
if (!zend_bitset_in(valid_T, currT)) {
int use_new_var = 0;
/* Code in "finally" blocks may modify temorary variables.
* We allocate new temporaries for values that need to
* relive FAST_CALLs.
*/
if ((op_array->fn_flags & ZEND_ACC_HAS_FINALLY_BLOCK) &&
(opline->opcode == ZEND_RETURN ||
opline->opcode == ZEND_RETURN_BY_REF ||
opline->opcode == ZEND_FREE ||
opline->opcode == ZEND_FE_FREE)) {
zend_op *curr = opline;
while (--curr >= end) {
if (curr->opcode == ZEND_FAST_CALL) {
use_new_var = 1;
break;
} else if (curr->opcode != ZEND_FREE &&
curr->opcode != ZEND_FE_FREE &&
curr->opcode != ZEND_VERIFY_RETURN_TYPE &&
curr->opcode != ZEND_DISCARD_EXCEPTION) {
break;
}
}
}
if (use_new_var) {
i = ++max;
zend_bitset_incl(taken_T, i);
} else {
GET_AVAILABLE_T();
}
map_T[currT] = i;
zend_bitset_incl(valid_T, currT);
}
ZEND_OP1(opline).var = NUM_VAR(map_T[currT] + offset);
}
}
/* Skip OP_DATA */
if (opline->opcode == ZEND_OP_DATA &&
(opline-1)->opcode == ZEND_ASSIGN_DIM) {
opline--;
continue;
}
if ((ZEND_OP2_TYPE(opline) & (IS_VAR | IS_TMP_VAR))) {
currT = VAR_NUM(ZEND_OP2(opline).var) - offset;
if (!zend_bitset_in(valid_T, currT)) {
GET_AVAILABLE_T();
map_T[currT] = i;
zend_bitset_incl(valid_T, currT);
}
ZEND_OP2(opline).var = NUM_VAR(map_T[currT] + offset);
}
if (opline->opcode == ZEND_DECLARE_INHERITED_CLASS ||
opline->opcode == ZEND_DECLARE_ANON_INHERITED_CLASS ||
opline->opcode == ZEND_DECLARE_INHERITED_CLASS_DELAYED) {
currT = VAR_NUM(opline->extended_value) - offset;
if (!zend_bitset_in(valid_T, currT)) {
GET_AVAILABLE_T();
map_T[currT] = i;
zend_bitset_incl(valid_T, currT);
}
opline->extended_value = NUM_VAR(map_T[currT] + offset);
}
/* Allocate OP_DATA->op2 after "operands", but before "result" */
if (opline->opcode == ZEND_ASSIGN_DIM &&
(opline + 1)->opcode == ZEND_OP_DATA &&
ZEND_OP2_TYPE(opline + 1) & (IS_VAR | IS_TMP_VAR)) {
currT = VAR_NUM(ZEND_OP2(opline + 1).var) - offset;
GET_AVAILABLE_T();
map_T[currT] = i;
zend_bitset_incl(valid_T, currT);
zend_bitset_excl(taken_T, i);
ZEND_OP2(opline + 1).var = NUM_VAR(i + offset);
var_to_free = i;
}
if (ZEND_RESULT_TYPE(opline) & (IS_VAR | IS_TMP_VAR)) {
currT = VAR_NUM(ZEND_RESULT(opline).var) - offset;
if (zend_bitset_in(valid_T, currT)) {
if (start_of_T[currT] == opline) {
/* ZEND_FAST_CALL can not share temporary var with others
* since the fast_var could also be set by ZEND_HANDLE_EXCEPTION
* which could be ahead of it */
if (opline->opcode != ZEND_FAST_CALL) {
zend_bitset_excl(taken_T, map_T[currT]);
}
}
ZEND_RESULT(opline).var = NUM_VAR(map_T[currT] + offset);
if (opline->opcode == ZEND_ROPE_INIT) {
if (start_of_T[currT] == opline) {
uint32_t num = ((opline->extended_value * sizeof(zend_string*)) + (sizeof(zval) - 1)) / sizeof(zval);
while (num > 1) {
num--;
zend_bitset_excl(taken_T, map_T[currT]+num);
}
}
}
} else { /* Au still needs to be assigned a T which is a bit dumb. Should consider changing Zend */
GET_AVAILABLE_T();
if (RESULT_UNUSED(opline)) {
zend_bitset_excl(taken_T, i);
} else {
/* Code which gets here is using a wrongly built opcode such as RECV() */
map_T[currT] = i;
zend_bitset_incl(valid_T, currT);
}
ZEND_RESULT(opline).var = NUM_VAR(i + offset);
}
}
if (var_to_free >= 0) {
zend_bitset_excl(taken_T, var_to_free);
var_to_free = -1;
}
opline--;
}
if (op_array->live_range) {
for (i = 0; i < op_array->last_live_range; i++) {
op_array->live_range[i].var =
NUM_VAR(map_T[VAR_NUM(op_array->live_range[i].var & ~ZEND_LIVE_MASK) - offset] + offset) |
(op_array->live_range[i].var & ZEND_LIVE_MASK);
}
}
zend_arena_release(&ctx->arena, checkpoint);
op_array->T = max + 1;
}
