[interpreter] Add basic framework for bytecode handler code generation.

src/compiler/raw-machine-assembler.h

Index: src/compiler/raw-machine-assembler.h
diff --git a/src/compiler/raw-machine-assembler.h b/src/compiler/raw-machine-assembler.h
index bc28e6c8175d3ef909e32732c7e75ff1dbc26d2d..6b8c693b5f9250182375c67cb6816874e8555027 100644
--- a/src/compiler/raw-machine-assembler.h
+++ b/src/compiler/raw-machine-assembler.h
@@ -47,6 +47,12 @@ class RawMachineAssembler : public GraphBuilder {
                       MachineType word = kMachPtr,
                       MachineOperatorBuilder::Flags flags =
                           MachineOperatorBuilder::Flag::kNoFlags);
+
+  RawMachineAssembler(Isolate* isolate, Graph* graph,
+                      const MachineSignature* machine_sig, MachineType word,
+                      MachineOperatorBuilder::Flags flags,
+                      CallDescriptor* call_descriptor);

[oth, 2015/07/15 13:22:01]

The two constructors for RawMachineAssembler could be rolled into one, but
adding a default parameter CallDescriptor* call_descriptor = nullptr to the
existing constructor.

[rmcilroy, 2015/07/15 16:55:58]

The existing constructor passes Linkage::GetSimplifiedCDescriptor(graph->zone(),
machine_sig) to call_descriptor, so a nullptr default wouldn't really work the
same way unfortunately (unless I explicitly checked for nullptr in the
constructor, but that seems nasty).

However, I agree it would be nice to avoid the double constructors, so I've
refactored the existing RawMachineAssembler to explicitly pass the correct
CallDescriptor instead. I moved this to a seperate CL at
https://codereview.chromium.org/1235313002, let me know what you think?

+
   ~RawMachineAssembler() override {}
 
   Zone* zone() const { return graph()->zone(); }
@@ -509,21 +515,22 @@ class RawMachineAssembler : public GraphBuilder {
   // MachineAssembler is invalid after export.
   Schedule* Export();
 
+  Schedule* schedule() {
+    DCHECK(ScheduleValid());
+    return schedule_;
+  }
+
+  BasicBlock* CurrentBlock();
+
  protected:
   Node* MakeNode(const Operator* op, int input_count, Node** inputs,
                  bool incomplete) final;
 
   bool ScheduleValid() { return schedule_ != NULL; }
 
-  Schedule* schedule() {
-    DCHECK(ScheduleValid());
-    return schedule_;
-  }
-
  private:
   BasicBlock* Use(Label* label);
   BasicBlock* EnsureBlock(Label* label);
-  BasicBlock* CurrentBlock();
 
   Schedule* schedule_;
   MachineOperatorBuilder machine_;