[Interpreter] Pass context to interpreter bytecode handlers and add LoadConstextSlot

src/compiler/linkage.cc

Index: src/compiler/linkage.cc
diff --git a/src/compiler/linkage.cc b/src/compiler/linkage.cc
index 66e5cda7d7536f01431f1bdf9edf4a1b114299b0..3ef5b9a7a61ea337f6fcc417ec18c15fa5ffb788 100644
--- a/src/compiler/linkage.cc
+++ b/src/compiler/linkage.cc
@@ -387,8 +387,8 @@ CallDescriptor* Linkage::GetJSCallDescriptor(Zone* zone, bool is_osr,
 
 
 CallDescriptor* Linkage::GetInterpreterDispatchDescriptor(Zone* zone) {
-  MachineSignature::Builder types(zone, 0, 5);
-  LocationSignature::Builder locations(zone, 0, 5);
+  MachineSignature::Builder types(zone, 0, 6);
+  LocationSignature::Builder locations(zone, 0, 6);
 
   // Add registers for fixed parameters passed via interpreter dispatch.
   STATIC_ASSERT(0 == Linkage::kInterpreterAccumulatorParameter);
@@ -411,6 +411,15 @@ CallDescriptor* Linkage::GetInterpreterDispatchDescriptor(Zone* zone) {
   types.AddParam(kMachPtr);
   locations.AddParam(regloc(kInterpreterDispatchTableRegister));
 
+  STATIC_ASSERT(5 == Linkage::kInterpreterContextParameter);
+  types.AddParam(kMachAnyTagged);
+#if defined(V8_TARGET_ARCH_IA32)

[Michael Starzinger, 2015/08/20 09:32:02]

Just for posterity: Not a huge fan of this #ifdef here, but let's keep it like
it is and not overly abstract is for now, because it might change in the future
anyways.

[rmcilroy, 2015/08/24 10:14:38]

Acknowledged.

+  locations.AddParam(
+      LinkageLocation::ForCallerFrameSlot(kInterpreterContextSpillSlot));
+#else
+  locations.AddParam(regloc(kContextRegister));
+#endif
+
   LinkageLocation target_loc = LinkageLocation::ForAnyRegister();
   return new (zone) CallDescriptor(         // --
       CallDescriptor::kCallCodeObject,      // kind