Implement context cloning in new compiler.

runtime/vm/intermediate_language.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_INTERMEDIATE_LANGUAGE_H_
 #define VM_INTERMEDIATE_LANGUAGE_H_
 
 #include "vm/allocation.h"
 #include "vm/ast.h"
 #include "vm/growable_array.h"
@@ skipping 37 matching lines @@
   M(InstanceOf, InstanceOfComp)                                                \
   M(CreateArray, CreateArrayComp)                                              \
   M(CreateClosure, CreateClosureComp)                                          \
   M(AllocateObject, AllocateObjectComp)                                        \
   M(NativeLoadField, NativeLoadFieldComp)                                      \
   M(ExtractFactoryTypeArguments, ExtractFactoryTypeArgumentsComp)              \
   M(ExtractConstructorTypeArguments, ExtractConstructorTypeArgumentsComp)      \
   M(ExtractConstructorInstantiator, ExtractConstructorInstantiatorComp)        \
   M(AllocateContext, AllocateContextComp)                                      \
   M(ChainContext, ChainContextComp)                                            \
+  M(CloneContext, CloneContextComp)                                            \
 
 
 #define FORWARD_DECLARATION(ShortName, ClassName) class ClassName;
 FOR_EACH_COMPUTATION(FORWARD_DECLARATION)
 #undef FORWARD_DECLARATION
 
 class Computation : public ZoneAllocated {
  public:
   Computation() { }
 
@@ skipping 733 matching lines @@
 
   Value* context_value() const { return context_value_; }
 
  private:
   Value* context_value_;
 
   DISALLOW_COPY_AND_ASSIGN(ChainContextComp);
 };
 
 
+class CloneContextComp : public Computation {
+ public:
+  CloneContextComp(intptr_t node_id,
+                   intptr_t token_index,
+                   Value* context_value)
+      : node_id_(node_id),
+        token_index_(token_index),
+        context_value_(context_value) {
+    ASSERT(context_value_ != NULL);
+  }
+
+  intptr_t node_id() const { return node_id_; }
+  intptr_t token_index() const { return token_index_; }
+  Value* context_value() const { return context_value_; }
+
+  DECLARE_COMPUTATION(CloneContext)
+
+ private:
+  const intptr_t node_id_;
+  const intptr_t token_index_;
+  Value* context_value_;
+
+  DISALLOW_COPY_AND_ASSIGN(CloneContextComp);
+};
+
+
 #undef DECLARE_COMPUTATION
 
 
 // Instructions.
 //
 // <Instruction> ::= JoinEntry <Instruction>
 //                 | TargetEntry <Instruction>
 //                 | PickTemp <int> <int> <Instruction>
 //                 | TuckTemp <int> <int> <Instruction>
 //                 | Do <Computation> <Instruction>
@@ skipping 467 matching lines @@
   const GrowableArray<BlockEntryInstr*>& block_order_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(FlowGraphVisitor);
 };
 
 
 }  // namespace dart
 
 #endif  // VM_INTERMEDIATE_LANGUAGE_H_