First step in reducing the size of PC descriptors.

runtime/vm/raw_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_RAW_OBJECT_H_
 #define VM_RAW_OBJECT_H_
 
 #include "platform/assert.h"
 #include "vm/globals.h"
 #include "vm/token.h"
@@ skipping 822 matching lines @@
   }
 
   // Compilation timestamp.
   int64_t compile_timestamp_;
   intptr_t pointer_offsets_length_;
   // Alive: If true, the embedded object pointers will be visited during GC.
   // This field cannot be shorter because of alignment issues on x64
   // architectures.
   intptr_t state_bits_;  // state, is_optimized, is_alive.
 
+  // PC offsets for code patching.
+  intptr_t entry_patch_pc_offset_;

[Ivan Posva, 2014/06/05 22:28:04]

Do these have to be intptr_t or would a sized pointer suffice?

[Florian Schneider, 2014/06/06 08:54:27]

I guess int32_t would be enough for the size of generated code.

+  intptr_t patch_code_pc_offset_;
+  intptr_t lazy_deopt_pc_offset_;
+
   // Variable length data follows here.
   int32_t data_[0];
 
   friend class StackFrame;
   friend class MarkingVisitor;
   friend class Function;
 };
 
 
 class RawInstructions : public RawObject {
@@ skipping 996 matching lines @@
   COMPILE_ASSERT(kTypedDataInt8ArrayViewCid == kTypedDataInt8ArrayCid + 14);
   COMPILE_ASSERT(kExternalTypedDataInt8ArrayCid ==
                  kTypedDataInt8ArrayViewCid + 15);
   COMPILE_ASSERT(kNullCid == kExternalTypedDataInt8ArrayCid + 14);
   return (kNullCid - kTypedDataInt8ArrayCid);
 }
 
 }  // namespace dart
 
 #endif  // VM_RAW_OBJECT_H_