Added command line debugger to D8 shell....

src/d8-debug.cc

+// Copyright 2008 the V8 project authors. All rights reserved.
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+//       notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+//       copyright notice, this list of conditions and the following
+//       disclaimer in the documentation and/or other materials provided
+//       with the distribution.
+//     * Neither the name of Google Inc. nor the names of its
+//       contributors may be used to endorse or promote products derived
+//       from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
+#include "d8.h"
+#include "d8-debug.h"
+
+
+namespace v8 {
+
+
+void HandleDebugEvent(DebugEvent event,
+                      Handle<Object> exec_state,
+                      Handle<Object> event_data,
+                      Handle<Value> data) {
+  HandleScope scope;
+
+  // Currently only handles break and exception events.
+  if (event != Break && event != Exception) return;
+
+  TryCatch try_catch;
+
+  // Print the event details.
+  Handle<String> details = Shell::DebugEventToText(event_data);
+  String::Utf8Value str(details);
+  printf("%s\n", *str);
+
+  // Get the debug command processor.
+  Local<String> fun_name = String::New("debugCommandProcessor");
+  Local<Function> fun = Function::Cast(*exec_state->Get(fun_name));
+  Local<Object> cmd_processor =
+      Object::Cast(*fun->Call(exec_state, 0, NULL));
+  if (try_catch.HasCaught()) {
+    Shell::ReportException(&try_catch);
+    return;
+  }
+
+  static const int kBufferSize = 256;
+  bool running = false;
+  while (!running) {
+    char command[kBufferSize];
+    printf("dbg> ");
+    char* str = fgets(command, kBufferSize, stdin);
+    if (str == NULL) break;
+
+    // Ignore empty commands.
+    if (strlen(command) == 0) continue;
+
+    TryCatch try_catch;
+
+    // Convert the debugger command to a JSON debugger request.
+    Handle<Value> request = Shell::DebugCommandToJSONRequest(String::New(command));
+    if (try_catch.HasCaught()) {
+      Shell::ReportException(&try_catch);
+      continue;
+    }
+
+    // If undefined is returned the command was handled internally and there is
+    // no JSON to send.
+    if (request->IsUndefined()) {
+      continue;
+    }
+
+    Handle<String> fun_name;
+    Handle<Function> fun;
+    // All the functions used below takes one argument.
+    static const int kArgc = 1;
+    Handle<Value> args[kArgc];
+
+    // Invoke the JavaScript to convert the debug command line to a JSON
+    // request, invoke the JSON request and convert the JSON respose to a text
+    // representation.
+    fun_name = String::New("processDebugRequest");
+    fun = Handle<Function>::Cast(cmd_processor->Get(fun_name));
+    args[0] = request;
+    Handle<Value> response_val = fun->Call(cmd_processor, kArgc, args);
+    if (try_catch.HasCaught()) {
+      Shell::ReportException(&try_catch);
+      continue;
+    }
+    Handle<String> response = Handle<String>::Cast(response_val);
+
+    // Convert the debugger response into text details and the running state.
+    Handle<Object> response_details = Shell::DebugResponseDetails(response);
+    if (try_catch.HasCaught()) {
+      Shell::ReportException(&try_catch);
+      continue;
+    }
+    String::Utf8Value text_str(response_details->Get(String::New("text")));
+    if (text_str.length() > 0) {
+      printf("%s\n", *text_str);
+    }
+    running =
+        response_details->Get(String::New("running"))->ToBoolean()->Value();
+  }
+}
+
+
+}  // namespace v8