Introduce the Error object class in the vm. It represents all of the

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 139 matching lines @@
     kLibraryClass,
     kLibraryPrefixClass,
     kCodeClass,
     kInstructionsClass,
     kPcDescriptorsClass,
     kLocalVarDescriptorsClass,
     kExceptionHandlersClass,
     kContextClass,
     kContextScopeClass,
     kApiErrorClass,
+    kLanguageErrorClass,
+    kUnhandledExceptionClass,
+    kUnwindErrorClass,
     kMaxId,
     kInvalidIndex = -1,
   };
 
   virtual ~Object() { }
 
   RawObject* raw() const { return raw_; }
   void operator=(RawObject* value) { SetRaw(value); }
 
   void set_tags(intptr_t value) {
@@ skipping 113 matching lines @@
   static RawClass* code_class() { return code_class_; }
   static RawClass* instructions_class() { return instructions_class_; }
   static RawClass* pc_descriptors_class() { return pc_descriptors_class_; }
   static RawClass* var_descriptors_class() { return var_descriptors_class_; }
   static RawClass* exception_handlers_class() {
     return exception_handlers_class_;
   }
   static RawClass* context_class() { return context_class_; }
   static RawClass* context_scope_class() { return context_scope_class_; }
   static RawClass* api_error_class() { return api_error_class_; }
+  static RawClass* language_error_class() { return language_error_class_; }
+  static RawClass* unhandled_exception_class() {
+    return unhandled_exception_class_;
+  }
+  static RawClass* unwind_error_class() { return unwind_error_class_; }
 
   static int GetSingletonClassIndex(const RawClass* raw_class);
   static RawClass* GetSingletonClass(int index);
   static const char* GetSingletonClassName(int index);
 
   static RawClass* CreateAndRegisterInterface(const char* cname,
                                               const Script& script,
                                               const Library& lib);
   static void RegisterClass(const Class& cls,
                             const char* cname,
@@ skipping 84 matching lines @@
   static RawClass* library_class_;  // Class of the Library vm object.
   static RawClass* library_prefix_class_;  // Class of Library prefix vm object.
   static RawClass* code_class_;  // Class of the Code vm object.
   static RawClass* instructions_class_;  // Class of the Instructions vm object.
   static RawClass* pc_descriptors_class_;  // Class of PcDescriptors vm object.
   static RawClass* var_descriptors_class_;  // Class of LocalVarDescriptors.
   static RawClass* exception_handlers_class_;  // Class of ExceptionHandlers.
   static RawClass* context_class_;  // Class of the Context vm object.
   static RawClass* context_scope_class_;  // Class of ContextScope vm object.
   static RawClass* api_error_class_;  // Class of ApiError.
+  static RawClass* language_error_class_;  // Class of LanguageError.
+  static RawClass* unhandled_exception_class_;  // Class of UnhandledException.
+  static RawClass* unwind_error_class_;  // Class of UnwindError.
 
   friend void RawObject::Validate() const;
 
   // Disallow allocation.
   void* operator new(size_t size);
   // Disallow copy constructor.
   DISALLOW_COPY_AND_ASSIGN(Object);
 };
 
 
@@ skipping 1763 matching lines @@
     raw_addr += sizeof(RawContextScope) +
         (index * sizeof(RawContextScope::VariableDesc));
     return reinterpret_cast<RawContextScope::VariableDesc*>(raw_addr);
   }
 
   HEAP_OBJECT_IMPLEMENTATION(ContextScope, Object);
   friend class Class;
 };
 
 
-class UnhandledException : public Object {
+class Error : public Object {
+ 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);
+
+ 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);
+
+ 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);
 
  private:
   void set_exception(const Instance& exception) const;
   void set_stacktrace(const Instance& stacktrace) const;
 
-  HEAP_OBJECT_IMPLEMENTATION(UnhandledException, Object);
+  HEAP_OBJECT_IMPLEMENTATION(UnhandledException, Error);
   friend class Class;
 };
 
 
-class ApiError : public Object {
+class UnwindError : public Error {
  public:
-  RawObject* data() const { return raw_ptr()->data_; }
-  static intptr_t data_offset() {
-    return OFFSET_OF(RawApiError, data_);
+  RawString* message() const { return raw_ptr()->message_; }
+  static intptr_t message_offset() {
+    return OFFSET_OF(RawUnwindError, message_);
   }
 
   static intptr_t InstanceSize() {
-    return RoundedAllocationSize(sizeof(RawApiError));
+    return RoundedAllocationSize(sizeof(RawUnwindError));
   }
 
-  static RawApiError* New(const String& message,
-                          Heap::Space space = Heap::kNew);
-
-  static RawApiError* New(const UnhandledException& exception,
-                          Heap::Space space = Heap::kNew);
+  static RawUnwindError* New(const String& message,
+                             Heap::Space space = Heap::kNew);
 
  private:
-  void set_data(const Object& data) const;
+  void set_message(const String& message) const;
 
-  HEAP_OBJECT_IMPLEMENTATION(ApiError, Object);
+  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.
 class Instance : public Object {
  public:
   virtual bool Equals(const Instance& other) const;
   virtual RawInstance* Canonicalize() const;
@@ skipping 1136 matching lines @@
 }
 
 
 void Context::SetAt(intptr_t index, const Instance& value) const {
   StorePointer(InstanceAddr(index), value.raw());
 }
 
 }  // namespace dart
 
 #endif  // VM_OBJECT_H_