Improve RegExp.prototype.compile (#2971)

This patch fixes the return value of the routine also fixes several incorrect regression-tests
due to the previously incorrect [[RegExpMatcher]] internal slot check.

JerryScript-DCO-1.0-Signed-off-by: Robert Fancsik frobert@inf.u-szeged.hu

tests/jerry/es2015/regression-test-issue-612.js

@@ -12,5 +12,9 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-var result = RegExp.prototype.compile([]);
-assert(result === undefined);
+try {
+  RegExp.prototype.compile([]);
+  assert(false);
+} catch (e) {
+  assert(e instanceof TypeError);
+}

tests/jerry/regexp-routines.js

@@ -94,7 +94,7 @@ try {
 }
 
 re2.lastIndex = 2;
-re2.compile("asd", "im");
+assert (re2.compile("asd", "im") === re2);
 
 assert (re2 == "/asd/im");
 assert (re2.global === false);
@@ -103,7 +103,7 @@ assert (re2.multiline === true);
 assert (re2.source === "asd");
 assert (re2.lastIndex === 0);
 
-re2.compile(re1);
+assert (re2.compile(re1) === re2);
 assert (re2.toString() === re1.toString());
 assert (re2.global === re1.global);
 assert (re2.ignoreCase === re1.ignoreCase);

tests/jerry/regression-test-issue-1065.js

@@ -12,5 +12,11 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-new (new (new RegExp().constructor)().constructor)().constructor.prototype.toString()
-RegExp().constructor().constructor.prototype.compile(RegExp.prototype)
+new (new (new RegExp().constructor)().constructor)().constructor.prototype.toString();
+
+try {
+  RegExp().constructor().constructor.prototype.compile(RegExp.prototype);
+  assert(false);
+} catch (e) {
+  assert(e instanceof TypeError);
+}

tests/jerry/regression-test-issue-1080.js

@@ -14,5 +14,12 @@
 
 ((new RegExp("}").constructor)("a", "g").constructor)(undefined).constructor.prototype.toString();
 new Date("2015-07-09T12:13:14.121+01:30").toISOString();
-RegExp(new RegExp("a", "g")).constructor("").constructor.prototype.compile(RegExp.prototype);
+
+try {
+  RegExp(new RegExp("a", "g")).constructor("").constructor.prototype.compile(RegExp.prototype);
+  assert (false);
+} catch (e) {
+  assert(e instanceof TypeError);
+}
+
 new Date("2015-09-17").getUTCFullYear();

tests/jerry/regression-test-issue-783.js

@@ -12,4 +12,9 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-RegExp.prototype.compile(RegExp.prototype);
+try {
+  RegExp.prototype.compile(RegExp.prototype);
+  assert(false);
+} catch (e) {
+  assert (e instanceof TypeError);
+}