Implement x64 compilation for loading and storing local variables.

runtime/vm/flow_graph_compiler_x64.h

Index: runtime/vm/flow_graph_compiler_x64.h
diff --git a/runtime/vm/flow_graph_compiler_x64.h b/runtime/vm/flow_graph_compiler_x64.h
index db83d44811953d6f48216bb67acd8227bfb2c9d5..2c080bff462ed295c2b154dfe11f64e6b23a7b43 100644
--- a/runtime/vm/flow_graph_compiler_x64.h
+++ b/runtime/vm/flow_graph_compiler_x64.h
@@ -17,7 +17,7 @@ namespace dart {
 
 class ParsedFunction;
 
-class FlowGraphCompiler : public InstructionVisitor {
+class FlowGraphCompiler : public FlowGraphVisitor {
  public:
   FlowGraphCompiler(Assembler* assembler,
                     const ParsedFunction& parsed_function,
@@ -25,21 +25,33 @@ class FlowGraphCompiler : public InstructionVisitor {
       : assembler_(assembler),
         parsed_function_(parsed_function),
         blocks_(blocks),
-        pc_descriptors_list_(new CodeGenerator::DescriptorList()) { }
+        pc_descriptors_list_(new CodeGenerator::DescriptorList()),
+        stack_local_count_(0) { }
 
   virtual ~FlowGraphCompiler() { }
 
   void CompileGraph();
 
  private:
+  int stack_local_count() const { return stack_local_count_; }
+  void set_stack_local_count(int count) { stack_local_count_ = count; }
+
   // Bail out of the flow graph compiler.  Does not return to the caller.
   void Bailout(const char* reason);
 
+  // Emit code to perform a computation, leaving its value in RAX.
+#define DECLARE_VISIT_COMPUTATION(ShortName, ClassName)                        \
+  virtual void Visit##ShortName(ClassName* comp);
+
   // Each visit function compiles a type of instruction.
-#define DECLARE_VISIT(type)                             \
-  virtual void Visit##type(type##Instr* instr);
-  FOR_EACH_INSTRUCTION(DECLARE_VISIT)
-#undef DECLARE_VISIT
+#define DECLARE_VISIT_INSTRUCTION(ShortName)                                   \
+  virtual void Visit##ShortName(ShortName##Instr* instr);
+
+  FOR_EACH_COMPUTATION(DECLARE_VISIT_COMPUTATION)
+  FOR_EACH_INSTRUCTION(DECLARE_VISIT_INSTRUCTION)
+
+#undef DECLARE_VISIT_COMPUTATION
+#undef DECLARE_VISIT_INSTRUCTION
 
   // Emit code to load a Value into register RAX.
   void LoadValue(Value* value);
@@ -57,6 +69,7 @@ class FlowGraphCompiler : public InstructionVisitor {
   const GrowableArray<BlockEntryInstr*>* blocks_;
 
   CodeGenerator::DescriptorList* pc_descriptors_list_;
+  int stack_local_count_;
 
   DISALLOW_COPY_AND_ASSIGN(FlowGraphCompiler);
 };