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

src/compiler/linkage-impl.h

Index: src/compiler/linkage-impl.h
diff --git a/src/compiler/linkage-impl.h b/src/compiler/linkage-impl.h
index 5b638034c8cbeaf7e141eda55d0d71150ba3bdcf..4fa40241366a51977a4ef7c69fde6cd26d5216be 100644
--- a/src/compiler/linkage-impl.h
+++ b/src/compiler/linkage-impl.h
@@ -233,18 +233,25 @@ class LinkageHelper {
         "c-call");
   }
 
-  static CallDescriptor* GetInterpreterDispatchDescriptor(
-      Zone* zone, const MachineSignature* msig) {
-    DCHECK_EQ(0, msig->parameter_count());
-    LocationSignature::Builder locations(zone, msig->return_count(),
-                                         msig->parameter_count());
-    AddReturnLocations(&locations);
+  static CallDescriptor* GetInterpreterDispatchDescriptor(Zone* zone) {
+    MachineSignature::Builder types(zone, 0, 2);
+    LocationSignature::Builder locations(zone, 0, 2);
+
+    // Add registers for fixed parameters passed via interpreter dispatch.
+    DCHECK_EQ(0, Linkage::kInterpreterBytecodeParameter);

[Michael Starzinger, 2015/07/21 13:51:45]

nit: Can this be made a STATIC_ASSERT?

[rmcilroy, 2015/07/23 10:43:54]

Done.

+    types.AddParam(kMachPtr);
+    locations.AddParam(regloc(LinkageTraits::InterpreterBytecodePointerReg()));
+
+    DCHECK_EQ(1, Linkage::kInterpreterDispatchTableParameter);

[Michael Starzinger, 2015/07/21 13:51:45]

nit: Can this be made a STATIC_ASSERT?

[rmcilroy, 2015/07/23 10:43:54]

Done (also in interpreter-assembler.cc).

+    types.AddParam(kMachPtr);
+    locations.AddParam(regloc(LinkageTraits::InterpreterDispatchTableReg()));
+
     LinkageLocation target_loc = LinkageLocation::AnyRegister();
     return new (zone) CallDescriptor(          // --
         CallDescriptor::kInterpreterDispatch,  // kind
         kMachNone,                             // target MachineType
         target_loc,                            // target location
-        msig,                                  // machine_sig
+        types.Build(),                         // machine_sig
         locations.Build(),                     // location_sig
         0,                                     // js_parameter_count
         Operator::kNoProperties,               // properties