Merge mainstream 'master' branch into refactoring

During merge I had to revert:
	Nikita's patch for php_splice() (it probably needs to be applyed again)
	Bob Weinand's patches related to constant expression handling (we need to review them carefully)
	I also reverted all our attempts to support sapi/phpdbg (we didn't test it anyway)

Conflicts:
	Zend/zend.h
	Zend/zend_API.c
	Zend/zend_ast.c
	Zend/zend_compile.c
	Zend/zend_compile.h
	Zend/zend_constants.c
	Zend/zend_exceptions.c
	Zend/zend_execute.c
	Zend/zend_execute.h
	Zend/zend_execute_API.c
	Zend/zend_hash.c
	Zend/zend_highlight.c
	Zend/zend_language_parser.y
	Zend/zend_language_scanner.c
	Zend/zend_language_scanner_defs.h
	Zend/zend_variables.c
	Zend/zend_vm_def.h
	Zend/zend_vm_execute.h
	ext/date/php_date.c
	ext/dom/documenttype.c
	ext/hash/hash.c
	ext/iconv/iconv.c
	ext/mbstring/tests/zend_multibyte-10.phpt
	ext/mbstring/tests/zend_multibyte-11.phpt
	ext/mbstring/tests/zend_multibyte-12.phpt
	ext/mysql/php_mysql.c
	ext/mysqli/mysqli.c
	ext/mysqlnd/mysqlnd_reverse_api.c
	ext/mysqlnd/php_mysqlnd.c
	ext/opcache/ZendAccelerator.c
	ext/opcache/zend_accelerator_util_funcs.c
	ext/opcache/zend_persist.c
	ext/opcache/zend_persist_calc.c
	ext/pcre/php_pcre.c
	ext/pdo/pdo_dbh.c
	ext/pdo/pdo_stmt.c
	ext/pdo_pgsql/pgsql_driver.c
	ext/pgsql/pgsql.c
	ext/reflection/php_reflection.c
	ext/session/session.c
	ext/spl/spl_array.c
	ext/spl/spl_observer.c
	ext/standard/array.c
	ext/standard/basic_functions.c
	ext/standard/html.c
	ext/standard/mail.c
	ext/standard/php_array.h
	ext/standard/proc_open.c
	ext/standard/streamsfuncs.c
	ext/standard/user_filters.c
	ext/standard/var_unserializer.c
	ext/standard/var_unserializer.re
	main/php_variables.c
	sapi/phpdbg/phpdbg.c
	sapi/phpdbg/phpdbg_bp.c
	sapi/phpdbg/phpdbg_frame.c
	sapi/phpdbg/phpdbg_help.c
	sapi/phpdbg/phpdbg_list.c
	sapi/phpdbg/phpdbg_print.c
	sapi/phpdbg/phpdbg_prompt.c

1 files changed, 83 insertions, 0 deletions

diff --git a/Zend/zend_operators.c b/Zend/zend_operators.c
index 397f8f60d7..764396aa03 100644
--- a/Zend/zend_operators.c
+++ b/Zend/zend_operators.c
@@ -1126,6 +1126,89 @@ ZEND_API int mul_function(zval *result, zval *op1, zval *op2 TSRMLS_DC) /* {{{ *
 }
 /* }}} */
 
+ZEND_API int pow_function(zval *result, zval *op1, zval *op2 TSRMLS_DC)
+{
+	zval op1_copy, op2_copy;
+	int converted = 0;
+
+	while (1) {
+		switch (TYPE_PAIR(Z_TYPE_P(op1), Z_TYPE_P(op2))) {
+			case TYPE_PAIR(IS_LONG, IS_LONG):
+				if (Z_LVAL_P(op2) >= 0) {
+					long l1 = 1, l2 = Z_LVAL_P(op1), i = Z_LVAL_P(op2);
+
+					if (i == 0) {
+						ZVAL_LONG(result, 1L);
+						return SUCCESS;
+					} else if (l2 == 0) {
+						ZVAL_LONG(result, 0);
+						return SUCCESS;
+					}
+
+					while (i >= 1) {
+						long overflow;
+						double dval = 0.0;
+
+						if (i % 2) {
+							--i;
+							ZEND_SIGNED_MULTIPLY_LONG(l1, l2, l1, dval, overflow);
+							if (overflow) {
+								ZVAL_DOUBLE(result, dval * pow(l2, i));
+								return SUCCESS;
+							}
+						} else {
+							i /= 2;
+							ZEND_SIGNED_MULTIPLY_LONG(l2, l2, l2, dval, overflow);
+							if (overflow) {
+								ZVAL_DOUBLE(result, (double)l1 * pow(dval, i));
+								return SUCCESS;
+							}
+						}
+					}
+					/* i == 0 */
+					ZVAL_LONG(result, l1);
+				} else {
+					ZVAL_DOUBLE(result, pow((double)Z_LVAL_P(op1), (double)Z_LVAL_P(op2)));
+				}
+				return SUCCESS;
+
+			case TYPE_PAIR(IS_LONG, IS_DOUBLE):
+				ZVAL_DOUBLE(result, pow((double)Z_LVAL_P(op1), Z_DVAL_P(op2)));
+				return SUCCESS;
+
+			case TYPE_PAIR(IS_DOUBLE, IS_LONG):
+				ZVAL_DOUBLE(result, pow(Z_DVAL_P(op1), (double)Z_LVAL_P(op2)));
+				return SUCCESS;
+
+			case TYPE_PAIR(IS_DOUBLE, IS_DOUBLE):
+				ZVAL_DOUBLE(result, pow(Z_DVAL_P(op1), Z_DVAL_P(op2)));
+				return SUCCESS;
+
+			default:
+				if (!converted) {
+					ZEND_TRY_BINARY_OBJECT_OPERATION(ZEND_POW);
+
+					if (Z_TYPE_P(op1) == IS_ARRAY) {
+						ZVAL_LONG(result, 0);
+						return SUCCESS;
+					} else {
+						zendi_convert_scalar_to_number(op1, op1_copy, result);
+					}
+					if (Z_TYPE_P(op2) == IS_ARRAY) {
+						ZVAL_LONG(result, 1L);
+						return SUCCESS;
+					} else {
+						zendi_convert_scalar_to_number(op2, op2_copy, result);
+					}
+					converted = 1;
+				} else {
+					zend_error(E_ERROR, "Unsupported operand types");
+					return FAILURE;
+				}
+		}
+	}
+}
+
 ZEND_API int div_function(zval *result, zval *op1, zval *op2 TSRMLS_DC) /* {{{ */
 {
 	zval op1_copy, op2_copy;