Precompilation: don't include an object header for instructions in the text section.

runtime/vm/object.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_OBJECT_H_
 #define VM_OBJECT_H_
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "platform/utils.h"
@@ skipping 3840 matching lines @@
   friend class Object;
   friend class RawObjectPool;
 };
 
 
 class Instructions : public Object {
  public:
   intptr_t size() const { return raw_ptr()->size_; }  // Excludes HeaderSize().
 
   uword EntryPoint() const {
-    return reinterpret_cast<uword>(raw_ptr()) + HeaderSize();
+    return EntryPoint(raw());
+  }
+  static uword EntryPoint(RawInstructions* instr) {
+    return reinterpret_cast<uword>(instr->ptr()) + HeaderSize();
   }
 
   static const intptr_t kMaxElements = (kMaxInt32 -
                                         (sizeof(RawInstructions) +
                                          sizeof(RawObject) +
                                          (2 * OS::kMaxPreferredCodeAlignment)));
 
   static intptr_t InstanceSize() {
     ASSERT(sizeof(RawInstructions) ==
            OFFSET_OF_RETURNED_VALUE(RawInstructions, data));
@@ skipping 446 matching lines @@
  private:
   static void UnpackInto(const Array& table,
                          const TypedData& packed,
                          GrowableArray<DeoptInstr*>* instructions,
                          intptr_t length);
 };
 
 
 class Code : public Object {
  public:
-  RawInstructions* active_instructions() const {
-    return raw_ptr()->active_instructions_;
-  }
+  uword active_entry_point() const { return raw_ptr()->entry_point_; }
 
   RawInstructions* instructions() const { return raw_ptr()->instructions_; }
 
   static intptr_t saved_instructions_offset() {
     return OFFSET_OF(RawCode, instructions_);
   }
 
   static intptr_t entry_point_offset() {
     return OFFSET_OF(RawCode, entry_point_);
   }
 
   RawObjectPool* object_pool() const { return raw_ptr()->object_pool_; }
   static intptr_t object_pool_offset() {
     return OFFSET_OF(RawCode, object_pool_);
   }
 
   intptr_t pointer_offsets_length() const {
     return PtrOffBits::decode(raw_ptr()->state_bits_);
   }
 
   bool is_optimized() const {
     return OptimizedBit::decode(raw_ptr()->state_bits_);
   }
   void set_is_optimized(bool value) const;
   bool is_alive() const {
     return AliveBit::decode(raw_ptr()->state_bits_);
   }
   void set_is_alive(bool value) const;
 
-  uword EntryPoint() const {
-    return Instructions::Handle(instructions()).EntryPoint();
-  }
-  intptr_t Size() const {
-    const Instructions& instr = Instructions::Handle(instructions());
-    return instr.size();
-  }
+  uword EntryPoint() const;
+  intptr_t Size() const;
+
   RawObjectPool* GetObjectPool() const {
     return object_pool();
   }
   bool ContainsInstructionAt(uword addr) const {
-    const Instructions& instr = Instructions::Handle(instructions());
-    const uword offset = addr - instr.EntryPoint();
-    return offset < static_cast<uword>(instr.size());
+    const uword offset = addr - EntryPoint();
+    return offset < static_cast<uword>(Size());
   }
 
   // Returns true if there is a debugger breakpoint set in this code object.
   bool HasBreakpoint() const;
 
   RawPcDescriptors* pc_descriptors() const {
     return raw_ptr()->pc_descriptors_;
   }
   void set_pc_descriptors(const PcDescriptors& descriptors) const {
     ASSERT(descriptors.IsOld());
@@ skipping 218 matching lines @@
   bool IsStubCode() const;
   bool IsFunctionCode() const;
 
   void DisableDartCode() const;
 
   void DisableStubCode() const;
 
   void Enable() const {
     if (!IsDisabled()) return;
     ASSERT(Thread::Current()->IsMutatorThread());
-    ASSERT(instructions() != active_instructions());
     SetActiveInstructions(instructions());
   }
 
   bool IsDisabled() const {
-    return instructions() != active_instructions();
+    return active_entry_point() != EntryPoint();
   }
 
  private:
   void set_state_bits(intptr_t bits) const;
 
   void set_object_pool(RawObjectPool* object_pool) const {
     StorePointer(&raw_ptr()->object_pool_, object_pool);
   }
 
   friend class RawObject;  // For RawObject::SizeFromClass().
@@ skipping 3792 matching lines @@
 
 
 RawObject* MegamorphicCache::GetTargetFunction(const Array& array,
                                                intptr_t index) {
   return array.At((index * kEntryLength) + kTargetFunctionIndex);
 }
 
 }  // namespace dart
 
 #endif  // VM_OBJECT_H_