Compress deopt instructions in memory using variable length encoding.

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/atomic.h"
 #include "vm/globals.h"
@@ skipping 17 matching lines @@
   V(TokenStream)                                                               \
   V(Script)                                                                    \
   V(Library)                                                                   \
   V(Namespace)                                                                 \
   V(Code)                                                                      \
   V(Instructions)                                                              \
   V(PcDescriptors)                                                             \
   V(Stackmap)                                                                  \
   V(LocalVarDescriptors)                                                       \
   V(ExceptionHandlers)                                                         \
-  V(DeoptInfo)                                                                 \
   V(Context)                                                                   \
   V(ContextScope)                                                              \
   V(ICData)                                                                    \
   V(MegamorphicCache)                                                          \
   V(SubtypeTestCache)                                                          \
   V(Error)                                                                     \
     V(ApiError)                                                                \
     V(LanguageError)                                                           \
     V(UnhandledException)                                                      \
     V(UnwindError)                                                             \
@@ skipping 1188 matching lines @@
   RawArray* handled_types_data_;
 
   // Exception handler info of length [num_entries_].
   const HandlerInfo* data() const { OPEN_ARRAY_START(HandlerInfo, intptr_t); }
   HandlerInfo* data() { OPEN_ARRAY_START(HandlerInfo, intptr_t); }
 
   friend class Object;
 };
 
 
-// Contains an array of deoptimization commands, e.g., move a specific register

[Ivan Posva, 2015/04/08 07:12:13]

Thanks!

-// into a specific slot of unoptimized frame.
-class RawDeoptInfo : public RawObject {
-  RAW_HEAP_OBJECT_IMPLEMENTATION(DeoptInfo);
-
-  RawSmi* length_;  // Number of deoptimization commands
-
-  // Variable length data follows here.
-  intptr_t* data() { OPEN_ARRAY_START(intptr_t, intptr_t); }
-  const intptr_t* data() const { OPEN_ARRAY_START(intptr_t, intptr_t); }
-};
-
-
 class RawContext : public RawObject {
   RAW_HEAP_OBJECT_IMPLEMENTATION(Context);
 
   int32_t num_variables_;
 
   RawObject** from() { return reinterpret_cast<RawObject**>(&ptr()->parent_); }
   RawContext* parent_;
 
   // Variable length data follows here.
   RawObject** data() { OPEN_ARRAY_START(RawObject*, RawObject*); }
@@ skipping 877 matching lines @@
          RawObject::IsOneByteStringClassId(index) ||
          RawObject::IsTwoByteStringClassId(index) ||
          RawObject::IsTypedDataClassId(index) ||
          (index == kContextCid) ||
          (index == kTypeArgumentsCid) ||
          (index == kInstructionsCid) ||
          (index == kPcDescriptorsCid) ||
          (index == kStackmapCid) ||
          (index == kLocalVarDescriptorsCid) ||
          (index == kExceptionHandlersCid) ||
-         (index == kDeoptInfoCid) ||
          (index == kCodeCid) ||
          (index == kContextScopeCid) ||
          (index == kInstanceCid) ||
          (index == kJSRegExpCid);
 }
 
 
 // This is a set of classes that are not Dart classes whose representation
 // is defined by the VM but are used in the VM code by computing the
 // implicit field offsets of the various fields in the dart object.
 inline bool RawObject::IsImplicitFieldClassId(intptr_t index) {
   return (IsTypedDataViewClassId(index) || index == kByteBufferCid);
 }
 
 
 inline intptr_t RawObject::NumberOfTypedDataClasses() {
   // Make sure this is updated when new TypedData types are added.
   COMPILE_ASSERT(kTypedDataInt8ArrayViewCid == kTypedDataInt8ArrayCid + 14);
   COMPILE_ASSERT(kExternalTypedDataInt8ArrayCid ==
                  kTypedDataInt8ArrayViewCid + 15);
   COMPILE_ASSERT(kByteBufferCid == kExternalTypedDataInt8ArrayCid + 14);
   COMPILE_ASSERT(kNullCid == kByteBufferCid + 1);
   return (kNullCid - kTypedDataInt8ArrayCid);
 }
 
 }  // namespace dart
 
 #endif  // VM_RAW_OBJECT_H_