Inline the StackResource constructor/destructor.

vm/allocation.h

 // Copyright (c) 2012, 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_ALLOCATION_H_
 #define VM_ALLOCATION_H_
 
 #include "platform/assert.h"
+#include "vm/base_isolate.h"
 #include "vm/globals.h"
 
 namespace dart {
 
 // Forward declarations.
 class Isolate;
 
 // Stack allocated objects subclass from this base class. Objects of this type
 // cannot be allocated on either the C or object heaps. Destructors for objects
 // of this type will not be run unless the stack is unwound through normal
@@ skipping 10 matching lines @@
 };
 
 
 // Stack resources subclass from this base class. The VM will ensure that the
 // destructors of these objects are called before the stack is unwound past the
 // objects location on the stack. Use stack resource objects if objects
 // need to be destroyed even in the case of exceptions when a Longjump is done
 // to a stack frame above the frame where these objects were allocated.
 class StackResource {
  public:
-  explicit StackResource(Isolate* isolate);
-  virtual ~StackResource();
+  explicit StackResource(BaseIsolate* isolate)
+      : isolate_(isolate), previous_(NULL) {
+    // We can only have longjumps and exceptions when there is a current
+    // isolate.  If there is no current isolate, we don't need to
+    // protect this case.
+    if (isolate) {
+      previous_ = isolate->top_resource();
+      isolate->set_top_resource(this);
+    }
+  }
 
-  Isolate* isolate() const { return isolate_; }
+  virtual ~StackResource() {
+    if (isolate()) {
+      StackResource* top = isolate()->top_resource();
+      ASSERT(top == this);
+      isolate()->set_top_resource(previous_);
+    }
+#if defined(DEBUG)
+    BaseIsolate::AssertCurrent(isolate());
+#endif
+  }
+
+  BaseIsolate* isolate() const { return isolate_; }
 
   // The delete operator should be private instead of public, but unfortunately
   // the compiler complains when compiling the destructors for subclasses.
   void operator delete(void* pointer) { UNREACHABLE(); }
 
  private:
-  Isolate* isolate_;  // Current isolate for this stack resource.
+  BaseIsolate* isolate_;  // Current isolate for this stack resource.
   StackResource* previous_;
 
   void* operator new(uword size);
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(StackResource);
 };
 
 
 // Static allocated classes only contain static members and can never
 // be instantiated in the heap or on the stack.
@@ skipping 27 matching lines @@
   // deallocated by invoking DeleteAll() on the zone they live in.
   void operator delete(void* pointer) { UNREACHABLE(); }
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ZoneAllocated);
 };
 
 }  // namespace dart
 
 #endif  // VM_ALLOCATION_H_