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/* pass 1
* - substitute persistent constants (true, false, null, etc)
* - perform compile-time evaluation of constant binary and unary operations
* - optimize series of ADD_STRING and/or ADD_CHAR
* - convert CAST(IS_BOOL,x) into BOOL(x)
* - convert INTI_FCALL_BY_NAME, DO_FCALL_BY_NAME into DO_FCALL
*/
if (ZEND_OPTIMIZER_PASS_1 & OPTIMIZATION_LEVEL) {
int i = 0;
zend_op *opline = op_array->opcodes;
zend_op *end = opline + op_array->last;
while (opline < end) {
switch (opline->opcode) {
case ZEND_ADD:
case ZEND_SUB:
case ZEND_MUL:
case ZEND_DIV:
case ZEND_MOD:
case ZEND_SL:
case ZEND_SR:
case ZEND_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 */
int (*binary_op)(zval *result, zval *op1, zval *op2 TSRMLS_DC) = get_binary_op(opline->opcode);
zend_uint 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) TSRMLS_CC) != SUCCESS) {
EG(error_reporting) = er;
break;
}
EG(error_reporting) = er;
PZ_SET_REFCOUNT_P(&result, 1);
PZ_UNSET_ISREF_P(&result);
literal_dtor(&ZEND_OP1_LITERAL(opline));
literal_dtor(&ZEND_OP2_LITERAL(opline));
MAKE_NOP(opline);
replace_tmp_by_const(op_array, opline + 1, tv, &result TSRMLS_CC);
}
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_uint 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;
}
literal_dtor(&ZEND_OP1_LITERAL(opline));
MAKE_NOP(opline);
replace_tmp_by_const(op_array, opline + 1, tv, &res TSRMLS_CC);
} 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;
zend_uint tv = ZEND_RESULT(opline).var; /* temporary variable */
int er;
er = EG(error_reporting);
EG(error_reporting) = 0;
#if ZEND_EXTENSION_API_NO < PHP_5_3_X_API_NO
if (unary_op(&result, &ZEND_OP1_LITERAL(opline)) != SUCCESS) {
#else
if (unary_op(&result, &ZEND_OP1_LITERAL(opline) TSRMLS_CC) != SUCCESS) {
#endif
EG(error_reporting) = er;
break;
}
EG(error_reporting) = er;
PZ_SET_REFCOUNT_P(&result, 1);
PZ_UNSET_ISREF_P(&result);
literal_dtor(&ZEND_OP1_LITERAL(opline));
MAKE_NOP(opline);
replace_tmp_by_const(op_array, opline + 1, tv, &result TSRMLS_CC);
}
break;
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;
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 += ZEND_OP2_LITERAL(next_op).value.str.len;
}
next_op++;
}
if (final_length == 0) {
break;
}
last_op = next_op;
final_length += (requires_conversion? 1 : ZEND_OP2_LITERAL(opline).value.str.len);
ptr = (char *)emalloc(final_length + 1);
ptr[final_length] = '\0';
if (requires_conversion) { /* ZEND_ADD_CHAR */
char chval = (char)ZEND_OP2_LITERAL(opline).value.lval;
ZEND_OP2_LITERAL(opline).value.str.val = ptr;
ptr[0] = chval;
ZEND_OP2_LITERAL(opline).type = IS_STRING;
opline->opcode = ZEND_ADD_STRING;
ptr++;
} else { /* ZEND_ADD_STRING */
memcpy(ptr, Z_STRVAL(ZEND_OP2_LITERAL(opline)), Z_STRLEN(ZEND_OP2_LITERAL(opline)));
if (!IS_INTERNED(Z_STRVAL(ZEND_OP2_LITERAL(opline)))) {
efree(Z_STRVAL(ZEND_OP2_LITERAL(opline)));
}
Z_STRVAL(ZEND_OP2_LITERAL(opline)) = ptr;
ptr += Z_STRLEN(ZEND_OP2_LITERAL(opline));
}
ZEND_OP2_LITERAL(opline).value.str.len = final_length;
next_op = opline + 1;
while (next_op < last_op) {
if (next_op->opcode == ZEND_ADD_STRING) {
memcpy(ptr, ZEND_OP2_LITERAL(next_op).value.str.val, ZEND_OP2_LITERAL(next_op).value.str.len);
ptr += ZEND_OP2_LITERAL(next_op).value.str.len;
literal_dtor(&ZEND_OP2_LITERAL(next_op));
} else { /* ZEND_ADD_CHAR */
*ptr = (char)ZEND_OP2_LITERAL(next_op).value.lval;
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;
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_bool orig_in_execution = EG(in_execution);
zend_op_array *orig_op_array = EG(active_op_array);
zval offset;
EG(in_execution) = 1;
EG(active_op_array) = op_array;
if (zend_get_constant("__COMPILER_HALT_OFFSET__", sizeof("__COMPILER_HALT_OFFSET__") - 1, &offset TSRMLS_CC)) {
zend_uint tv = ZEND_RESULT(opline).var;
literal_dtor(&ZEND_OP2_LITERAL(opline));
MAKE_NOP(opline);
replace_tmp_by_const(op_array, opline, tv, &offset TSRMLS_CC);
}
EG(active_op_array) = orig_op_array;
EG(in_execution) = orig_in_execution;
break;
}
if (ZEND_OP1_TYPE(opline) == IS_UNUSED &&
ZEND_OP2_TYPE(opline) == IS_CONST &&
ZEND_OP2_LITERAL(opline).type == IS_STRING) {
/* substitute persistent constants */
zend_uint tv = ZEND_RESULT(opline).var;
zval c;
if (!zend_get_persistent_constant(Z_STRVAL(ZEND_OP2_LITERAL(opline)), Z_STRLEN(ZEND_OP2_LITERAL(opline)), &c, 1 TSRMLS_CC)) {
break;
}
literal_dtor(&ZEND_OP2_LITERAL(opline));
MAKE_NOP(opline);
replace_tmp_by_const(op_array, opline, tv, &c TSRMLS_CC);
}
break;
case ZEND_INIT_FCALL_BY_NAME:
if (opline->extended_value == 0 /* not method */ &&
ZEND_OP1_TYPE(opline) == IS_UNUSED &&
ZEND_OP2_TYPE(opline) == IS_CONST) {
if ((opline + 1)->opcode == ZEND_DO_FCALL_BY_NAME &&
(opline + 1)->extended_value == 0) {
(opline + 1)->opcode = ZEND_DO_FCALL;
COPY_NODE((opline + 1)->op1, opline->op2);
zend_str_tolower(Z_STRVAL(ZEND_OP1_LITERAL(opline + 1)), Z_STRLEN(ZEND_OP1_LITERAL(opline + 1)));
#if ZEND_EXTENSION_API_NO > PHP_5_3_X_API_NO
Z_HASH_P(&ZEND_OP1_LITERAL(opline + 1)) = zend_hash_func(Z_STRVAL(ZEND_OP1_LITERAL(opline + 1)), Z_STRLEN(ZEND_OP1_LITERAL(opline + 1)) + 1);
op_array->literals[(opline + 1)->op1.constant].cache_slot = op_array->last_cache_slot++;
#endif
MAKE_NOP(opline);
}
}
break;
#if ZEND_EXTENSION_API_NO >= PHP_5_5_X_API_NO
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")) != 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_STRVAL(ZEND_OP1_LITERAL(opline)),
Z_STRLEN(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_STRVAL(ZEND_OP1_LITERAL(opline)),
Z_STRLEN(ZEND_OP1_LITERAL(opline)));
MAKE_NOP(opline);
}
}
}
break;
#endif
}
opline++;
i++;
}
}
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