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DEFINITIONS
This source file includes following definitions.
- optimize_temporary_variables
#if ZEND_EXTENSION_API_NO < PHP_5_3_X_API_NO
/* ops that use CLs:
op1:
ZEND_FETCH_CONSTANT:
ZEND_INIT_CTOR_CALL:
ZEND_INIT_STATIC_METHOD_CALL:
ZEND_INIT_METHOD_CALL:
ZEND_IMPORT_CLASS:
ZEND_IMPORT_FUNCTION:
ZEND_IMPORT_CONST:
ZEND_ADD_INTERFACE:
ZEND_VERIFY_ABSTRACT_CLASS:
ZEND_NEW:
ZEND_CATCH:
ZEND_INIT_FCALL_BY_NAME:
op2:
ZEND_UNSET_VAR:
ZEND_ISSET_ISEMPTY_VAR:
ZEND_FETCH_UNSET:
ZEND_FETCH_IS:
ZEND_FETCH_R:
ZEND_FETCH_W:
ZEND_FETCH_RW:
ZEND_FETCH_FUNC_ARG:
ZEND_ADD_INTERFACE:
ZEND_INSTANCEOF:
extended_value:
ZEND_DECLARE_INHERITED_CLASS:
ignore result
INIT_METHOD_CALL:
*/
#define OP1_CONST_IS_CLASS 1
#define OP2_CONST_IS_CLASS 2
#define EXT_CONST_IS_CLASS 4
#define RESULT_IS_UNUSED 8
static const char op_const_means_class[256] = {
/* 0 */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
/* 32 */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0,
/* 64 */
0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 2, 0, 0, 2, 0, 0, 2, 0, 0, 2, 0, 0, 2, 0, 0, 2,
/* 96 */
0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 9, 1, 2, 0, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0,
/* 128 */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 0, 4, 0, 0, 0, 3, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
/* 160 */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
/* 192 */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
/* 224 */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
};
#endif
#define GET_AVAILABLE_T() \
for (i = 0; i < T; i++) { \
if (!taken_T[i]) { \
break; \
} \
} \
taken_T[i] = 1; \
if (i > max) { \
max = i; \
}
static void optimize_temporary_variables(zend_op_array *op_array)
{
int T = op_array->T;
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;
taken_T = (char *) emalloc(T);
start_of_T = (zend_op **) emalloc(T * sizeof(zend_op *));
valid_T = (char *) emalloc(T);
map_T = (int *) emalloc(T * sizeof(int));
end = op_array->opcodes;
opline = &op_array->opcodes[op_array->last - 1];
/* Find T definition points */
while (opline >= end) {
#if ZEND_EXTENSION_API_NO < PHP_5_3_X_API_NO
if (ZEND_RESULT_TYPE(opline) & (IS_VAR | IS_TMP_VAR | IS_CONST)) {
if (!(op_const_means_class[opline->opcode] & RESULT_IS_UNUSED)) {
start_of_T[VAR_NUM(ZEND_RESULT(opline).var)] = opline;
}
}
#else
if (ZEND_RESULT_TYPE(opline) & (IS_VAR | IS_TMP_VAR)) {
start_of_T[VAR_NUM(ZEND_RESULT(opline).var)] = opline;
}
#endif
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))
#if ZEND_EXTENSION_API_NO < PHP_5_3_X_API_NO
|| ((op_const_means_class[opline->opcode] & OP1_CONST_IS_CLASS) && ZEND_OP1_TYPE(opline) == IS_CONST)
#endif
) {
currT = VAR_NUM(ZEND_OP1(opline).var);
if (!valid_T[currT]) {
GET_AVAILABLE_T();
map_T[currT] = i;
valid_T[currT] = 1;
}
ZEND_OP1(opline).var = NUM_VAR(map_T[currT]);
}
/* 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))
#if ZEND_EXTENSION_API_NO < PHP_5_3_X_API_NO
|| ((op_const_means_class[opline->opcode] & OP2_CONST_IS_CLASS) && ZEND_OP2_TYPE(opline) == IS_CONST)
#endif
) {
currT = VAR_NUM(ZEND_OP2(opline).var);
if (!valid_T[currT]) {
GET_AVAILABLE_T();
map_T[currT] = i;
valid_T[currT] = 1;
}
ZEND_OP2(opline).var = NUM_VAR(map_T[currT]);
}
#if ZEND_EXTENSION_API_NO < PHP_5_3_X_API_NO
if ((op_const_means_class[opline->opcode] & EXT_CONST_IS_CLASS)) {
#else
if (opline->opcode == ZEND_DECLARE_INHERITED_CLASS ||
opline->opcode == ZEND_DECLARE_INHERITED_CLASS_DELAYED) {
#endif
currT = VAR_NUM(opline->extended_value);
if (!valid_T[currT]) {
GET_AVAILABLE_T();
map_T[currT] = i;
valid_T[currT] = 1;
}
opline->extended_value = NUM_VAR(map_T[currT]);
}
/* 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);
GET_AVAILABLE_T();
map_T[currT] = i;
valid_T[currT] = 1;
taken_T[i] = 0;
ZEND_OP2(opline + 1).var = NUM_VAR(i);
var_to_free = i;
}
#if ZEND_EXTENSION_API_NO < PHP_5_3_X_API_NO
if (ZEND_RESULT_TYPE(opline) & (IS_VAR | IS_TMP_VAR | IS_CONST)) {
if (!(op_const_means_class[opline->opcode] & RESULT_IS_UNUSED)) {
#else
if (ZEND_RESULT_TYPE(opline) & (IS_VAR | IS_TMP_VAR)) {
#endif
currT = VAR_NUM(ZEND_RESULT(opline).var);
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]);
} 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);
}
#if ZEND_EXTENSION_API_NO < PHP_5_3_X_API_NO
}
#endif
}
if (var_to_free >= 0) {
taken_T[var_to_free] = 0;
var_to_free = -1;
}
opline--;
}
efree(taken_T);
efree(start_of_T);
efree(valid_T);
efree(map_T);
op_array->T = max + 1;
}