Hydrogen code stubs for vector-based ICs.

src/ic/handler-compiler.h

Index: src/ic/handler-compiler.h
diff --git a/src/ic/handler-compiler.h b/src/ic/handler-compiler.h
index 4fedd4e8d78c7127bff6feef5becf58dd724ecb8..cc867249a1b7e65ce15097eb0391ce041ee35d1b 100644
--- a/src/ic/handler-compiler.h
+++ b/src/ic/handler-compiler.h
@@ -30,6 +30,11 @@ class PropertyHandlerCompiler : public PropertyAccessCompiler {
 
   virtual ~PropertyHandlerCompiler() {}
 
+  // TODO(mvstanton): the frontend header in FLAG_vector_ic case needs to
+  // save the vector and slot registers on the stack, and the footer would
+  // pop them before calling the miss helper. Also, these regs need to be popped
+  // before any returns. P'rhaps the popping can be done at the end of the
+  // footer, eh? (idea from Toon).
   virtual Register FrontendHeader(Register object_reg, Handle<Name> name,
                                   Label* miss) {
     UNREACHABLE();
@@ -42,6 +47,15 @@ class PropertyHandlerCompiler : public PropertyAccessCompiler {
   void NonexistentFrontendHeader(Handle<Name> name, Label* miss,
                                  Register scratch1, Register scratch2);
 
+  // When FLAG_vector_ics is true, handlers that have the possibility of missing
+  // will need to save and pass these to miss handlers.
+  void PushVectorAndSlot();
+  void PushVectorAndSlot(Register vector, Register slot);
+  void PopVectorAndSlot();
+  void PopVectorAndSlot(Register vector, Register slot);
+
+  void DiscardVectorAndSlot();
+
   // TODO(verwaest): Make non-static.
   static void GenerateFastApiCall(MacroAssembler* masm,
                                   const CallOptimization& optimization,