Start using Dart_PropagateError in the runtime/bin directory.

runtime/bin/socket.cc

Index: runtime/bin/socket.cc
===================================================================
--- runtime/bin/socket.cc	(revision 5191)
+++ runtime/bin/socket.cc	(working copy)
@@ -13,12 +13,10 @@
 void FUNCTION_NAME(Socket_CreateConnect)(Dart_NativeArguments args) {
   Dart_EnterScope();
   Dart_Handle socketobj = Dart_GetNativeArgument(args, 0);
-  const char* host =
-      DartUtils::GetStringValue(Dart_GetNativeArgument(args, 1));
-  intptr_t port = DartUtils::GetIntegerValue(Dart_GetNativeArgument(args, 2));
+  const char* host = DartUtils::GetStringValue(Dart_GetNativeArgument(args, 1));
+  int64_t port = DartUtils::GetIntegerValue(Dart_GetNativeArgument(args, 2));
   intptr_t socket = Socket::CreateConnect(host, port);
-  DartUtils::SetIntegerField(
-      socketobj, DartUtils::kIdFieldName, socket);
+  DartUtils::SetIntegerField(socketobj, DartUtils::kIdFieldName, socket);
   Dart_SetReturnValue(args, Dart_NewBoolean(socket >= 0));
   Dart_ExitScope();
 }
@@ -26,9 +24,8 @@
 
 void FUNCTION_NAME(Socket_Available)(Dart_NativeArguments args) {
   Dart_EnterScope();
-  intptr_t socket =
-      DartUtils::GetIntegerField(Dart_GetNativeArgument(args, 0),
-                                 DartUtils::kIdFieldName);
+  int64_t socket = DartUtils::GetIntegerField(Dart_GetNativeArgument(args, 0),
+                                              DartUtils::kIdFieldName);
   intptr_t available = Socket::Available(socket);
   Dart_SetReturnValue(args, Dart_NewInteger(available));
   Dart_ExitScope();
@@ -48,7 +45,9 @@
       DartUtils::GetIntegerValue(Dart_GetNativeArgument(args, 3));
   intptr_t buffer_len = 0;
   Dart_Handle result = Dart_ListLength(buffer_obj, &buffer_len);
-  ASSERT(!Dart_IsError(result));
+  if (Dart_IsError(result)) {
+    Dart_PropagateError(result);
+  }
   ASSERT((offset + length) <= buffer_len);
 
   if (Dart_IsVMFlagSet("short_socket_read")) {
@@ -61,7 +60,8 @@
     Dart_Handle result =
         Dart_ListSetAsBytes(buffer_obj, offset, buffer, bytes_read);
     if (Dart_IsError(result)) {
-      bytes_read = -1;
+      delete[] buffer;
+      Dart_PropagateError(result);
     }
   }
   delete[] buffer;
@@ -83,7 +83,9 @@
       DartUtils::GetIntegerValue(Dart_GetNativeArgument(args, 3));
   intptr_t buffer_len = 0;
   Dart_Handle result = Dart_ListLength(buffer_obj, &buffer_len);
-  ASSERT(!Dart_IsError(result));
+  if (Dart_IsError(result)) {
+    Dart_PropagateError(result);
+  }
   ASSERT((offset + length) <= buffer_len);
 
   if (Dart_IsVMFlagSet("short_socket_write")) {
@@ -103,7 +105,10 @@
                                  offset + total_bytes_written,
                                  buffer,
                                  chunk_length);
-    ASSERT(!Dart_IsError(result));
+    if (Dart_IsError(result)) {
+      delete[] buffer;
+      Dart_PropagateError(result);
+    }
     bytes_written =
         Socket::Write(socket, reinterpret_cast<void*>(buffer), chunk_length);
     total_bytes_written += bytes_written;