First bits of external debugger API

runtime/vm/dart_dapi_impl.cc

+// Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+#include "include/dart_dapi.h"
+
+#include "vm/dart_api_impl.h"
+#include "vm/dart_api_state.h"
+#include "vm/debugger.h"
+#include "vm/isolate.h"
+#include "vm/longjump.h"
+
+
+namespace dart {
+
+
+DART_EXPORT void Dart_InitDebugger() {
+  Isolate* isolate = Isolate::Current();
+  DARTSCOPE(isolate);
+  isolate->debugger()->Initialize(isolate);
+}
+
+
+DART_EXPORT Dart_Handle Dart_SetBreakpointAtEntry(
+                            Dart_Handle library_in,
+                            Dart_Handle class_name_in,
+                            Dart_Handle function_name_in,
+                            Dart_Breakpoint* breakpoint) {
+  Isolate* isolate = Isolate::Current();
+  DARTSCOPE(isolate);
+  if (breakpoint != NULL) {
+    *breakpoint = NULL;
+  }
+  const char* msg = CheckIsolateState(isolate);
+  if (msg != NULL) {
+    return Api::Error(msg);
+  }
+
+  const Library& library =
+      Library::CheckedHandle(Api::UnwrapHandle(library_in));
+  if (library.IsNull()) {
+    return Api::Error("No library specified");
+  }
+  const String& class_name =
+      String::CheckedHandle(Api::UnwrapHandle(class_name_in));
+  const String& function_name =
+      String::CheckedHandle(Api::UnwrapHandle(function_name_in));
+
+  // Resolve the breakpoint target function.
+  const Function& bp_target = Function::Handle(
+      isolate->debugger()->ResolveFunction(
+          library, class_name, function_name));
+  if (bp_target.IsNull()) {
+    return Api::Error("Breakpoint target function does not exist");
+  }
+
+  LongJump* base = isolate->long_jump_base();
+  LongJump jump;
+  isolate->set_long_jump_base(&jump);
+  Dart_Handle result = Api::True();
+  if (setjmp(*jump.Set()) == 0) {
+    Breakpoint* bpt = isolate->debugger()->SetBreakpointAtEntry(bp_target);
+    if (breakpoint != NULL) {
+      *breakpoint = reinterpret_cast<Dart_Breakpoint>(bpt);
+    }
+  } else {
+    SetupErrorResult(&result);
+  }
+  isolate->set_long_jump_base(base);
+  return result;
+}
+
+
+}  // namespace dart