Standardize error printing a bit by moving it to the Error object and

runtime/vm/object.h

 // 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.
 
 #ifndef VM_OBJECT_H_
 #define VM_OBJECT_H_
 
 #include "vm/assert.h"
 #include "vm/dart.h"
 #include "vm/globals.h"
@@ skipping 2171 matching lines @@
         (index * sizeof(RawContextScope::VariableDesc));
     return reinterpret_cast<RawContextScope::VariableDesc*>(raw_addr);
   }
 
   HEAP_OBJECT_IMPLEMENTATION(ContextScope, Object);
   friend class Class;
 };
 
 
 class Error : public Object {
+ public:
+  virtual const char* ToErrorCString() const;
+
  private:
   HEAP_OBJECT_IMPLEMENTATION(Error, Object);
 };
 
 
 class ApiError : public Error {
  public:
   RawString* message() const { return raw_ptr()->message_; }
   static intptr_t message_offset() {
     return OFFSET_OF(RawApiError, message_);
   }
 
   static intptr_t InstanceSize() {
     return RoundedAllocationSize(sizeof(RawApiError));
   }
 
   static RawApiError* New(const String& message,
                           Heap::Space space = Heap::kNew);
 
+  virtual const char* ToErrorCString() const;
+
  private:
   void set_message(const String& message) const;
 
   HEAP_OBJECT_IMPLEMENTATION(ApiError, Error);
   friend class Class;
 };
 
 
 class LanguageError : public Error {
  public:
   RawString* message() const { return raw_ptr()->message_; }
   static intptr_t message_offset() {
     return OFFSET_OF(RawLanguageError, message_);
   }
 
   static intptr_t InstanceSize() {
     return RoundedAllocationSize(sizeof(RawLanguageError));
   }
 
   static RawLanguageError* New(const String& message,
                                Heap::Space space = Heap::kNew);
 
+  virtual const char* ToErrorCString() const;
+
  private:
   void set_message(const String& message) const;
 
   HEAP_OBJECT_IMPLEMENTATION(LanguageError, Error);
   friend class Class;
 };
 
 
 class UnhandledException : public Error {
  public:
   RawInstance* exception() const { return raw_ptr()->exception_; }
   static intptr_t exception_offset() {
     return OFFSET_OF(RawUnhandledException, exception_);
   }
 
   RawInstance* stacktrace() const { return raw_ptr()->stacktrace_; }
   static intptr_t stacktrace_offset() {
     return OFFSET_OF(RawUnhandledException, stacktrace_);
   }
 
   static intptr_t InstanceSize() {
     return RoundedAllocationSize(sizeof(RawUnhandledException));
   }
 
   static RawUnhandledException* New(const Instance& exception,
                                     const Instance& stacktrace,
                                     Heap::Space space = Heap::kNew);
 
+  virtual const char* ToErrorCString() const;
+
  private:
   void set_exception(const Instance& exception) const;
   void set_stacktrace(const Instance& stacktrace) const;
 
   HEAP_OBJECT_IMPLEMENTATION(UnhandledException, Error);
   friend class Class;
 };
 
 
 class UnwindError : public Error {
  public:
   RawString* message() const { return raw_ptr()->message_; }
   static intptr_t message_offset() {
     return OFFSET_OF(RawUnwindError, message_);
   }
 
   static intptr_t InstanceSize() {
     return RoundedAllocationSize(sizeof(RawUnwindError));
   }
 
   static RawUnwindError* New(const String& message,
                              Heap::Space space = Heap::kNew);
 
+  virtual const char* ToErrorCString() const;
+
  private:
   void set_message(const String& message) const;
 
   HEAP_OBJECT_IMPLEMENTATION(UnwindError, Error);
   friend class Class;
 };
 
 
 // Instance is the base class for all instance objects (aka the Object class
 // in Dart source code.
@@ skipping 1140 matching lines @@
 }
 
 
 void Context::SetAt(intptr_t index, const Instance& value) const {
   StorePointer(InstanceAddr(index), value.raw());
 }
 
 }  // namespace dart
 
 #endif  // VM_OBJECT_H_