Add restart command to the debugger (#2401)

With this feature the use can restart the actual debug session
(similar to the multiple source context reset) within a client.

JerryScript-DCO-1.0-Signed-off-by: Imre Kiss kissi.szeged@partner.samsung.com

tests/debugger/do_help.expected

@@ -4,9 +4,9 @@ Stopped at tests/debugger/do_help.js:15
 
 Documented commands (type help <topic>):
 ========================================
-abort      bt        display  exception  list      next    source
-b          c         dump     f          memstats  quit    src   
-backtrace  continue  e        finish     ms        s       step  
-break      delete    eval     help       n         scroll  throw 
+abort      bt        display  exception  list      next     s       step 
+b          c         dump     f          memstats  quit     scroll  throw
+backtrace  continue  e        finish     ms        res      source
+break      delete    eval     help       n         restart  src   
 
 (jerry-debugger) quit

tests/debugger/do_restart.cmd

@@ -0,0 +1,4 @@
+n
+n
+n
+restart

tests/debugger/do_restart.expected

@@ -0,0 +1,18 @@
+Connecting to: localhost:5001
+Stopped at tests/debugger/do_restart.js:23
+(jerry-debugger) n
+Stopped at tests/debugger/do_restart.js:24
+(jerry-debugger) n
+out: foo
+Stopped at tests/debugger/do_restart.js:25
+(jerry-debugger) n
+out: bar
+Stopped at tests/debugger/do_restart.js:24
+(jerry-debugger) restart
+Connecting to: localhost:5001
+Stopped at tests/debugger/do_restart.js:23
+(jerry-debugger) continue
+out: foo
+out: bar
+out: foo
+out: bar

tests/debugger/do_restart.js

@@ -0,0 +1,26 @@
+// Copyright JS Foundation and other contributors, http://js.foundation
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+function foo() {
+  print("foo");
+}
+
+function bar() {
+  print("bar");
+}
+
+for (var i = 0; i < 2; i++) {
+  foo();
+  bar();
+}