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

src/compiler/linkage.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/code-stubs.h"
 #include "src/compiler.h"
 #include "src/compiler/common-operator.h"
 #include "src/compiler/frame.h"
 #include "src/compiler/linkage.h"
 #include "src/compiler/node.h"
@@ skipping 369 matching lines @@
       Operator::kNoProperties,          // properties
       kNoCalleeSaved,                   // callee-saved
       kNoCalleeSaved,                   // callee-saved fp
       CallDescriptor::kCanUseRoots |    // flags
           flags,                        // flags
       "js-call");
 }
 
 
 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);
   types.AddParam(kMachAnyTagged);
   locations.AddParam(regloc(kInterpreterAccumulatorRegister));
 
   STATIC_ASSERT(1 == Linkage::kInterpreterRegisterFileParameter);
   types.AddParam(kMachPtr);
   locations.AddParam(regloc(kInterpreterRegisterFileRegister));
 
   STATIC_ASSERT(2 == Linkage::kInterpreterBytecodeOffsetParameter);
   types.AddParam(kMachIntPtr);
   locations.AddParam(regloc(kInterpreterBytecodeOffsetRegister));
 
   STATIC_ASSERT(3 == Linkage::kInterpreterBytecodeArrayParameter);
   types.AddParam(kMachAnyTagged);
   locations.AddParam(regloc(kInterpreterBytecodeArrayRegister));
 
   STATIC_ASSERT(4 == Linkage::kInterpreterDispatchTableParameter);
   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
       kMachNone,                            // target MachineType
       target_loc,                           // target location
       types.Build(),                        // machine_sig
       locations.Build(),                    // location_sig
       0,                                    // stack_parameter_count
       Operator::kNoProperties,              // properties
       kNoCalleeSaved,                       // callee-saved registers
@@ skipping 81 matching lines @@
     return LinkageLocation::ForCalleeFrameSlot(spill_index);
   } else {
     // Parameter. Use the assigned location from the incoming call descriptor.
     int parameter_index = 1 + index;  // skip index 0, which is the target.
     return incoming_->GetInputLocation(parameter_index);
   }
 }
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8