[turbofan] Add an InterpreterDispatch linkage type.

src/compiler/linkage.h

 // 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.
 
 #ifndef V8_COMPILER_LINKAGE_H_
 #define V8_COMPILER_LINKAGE_H_
 
 #include "src/base/flags.h"
 #include "src/compiler/frame.h"
 #include "src/compiler/machine-type.h"
@@ skipping 45 matching lines @@
 };
 
 typedef Signature<LinkageLocation> LocationSignature;
 
 // Describes a call to various parts of the compiler. Every call has the notion
 // of a "target", which is the first input to the call.
 class CallDescriptor final : public ZoneObject {
  public:
   // Describes the kind of this call, which determines the target.
   enum Kind {
-    kCallCodeObject,  // target is a Code object
-    kCallJSFunction,  // target is a JSFunction object
-    kCallAddress      // target is a machine pointer
+    kCallCodeObject,      // target is a Code object
+    kCallJSFunction,      // target is a JSFunction object
+    kCallAddress,         // target is a machine pointer
+    kInterpreterDispatch  // target is an interpreter bytecode handler
   };
 
   enum Flag {
     kNoFlags = 0u,
     kNeedsFrameState = 1u << 0,
     kPatchableCallSite = 1u << 1,
     kNeedsNopAfterCall = 1u << 2,
     kHasExceptionHandler = 1u << 3,
     kHasLocalCatchHandler = 1u << 4,
     kSupportsTailCalls = 1u << 5,
@@ skipping 25 matching lines @@
 
   // Returns the kind of this call.
   Kind kind() const { return kind_; }
 
   // Returns {true} if this descriptor is a call to a C function.
   bool IsCFunctionCall() const { return kind_ == kCallAddress; }
 
   // Returns {true} if this descriptor is a call to a JSFunction.
   bool IsJSFunctionCall() const { return kind_ == kCallJSFunction; }
 
+  bool IsInterpreterDispatch() const { return kind_ == kInterpreterDispatch; }
+
   // The number of return values from this call.
   size_t ReturnCount() const { return machine_sig_->return_count(); }
 
   // The number of C parameters to this call.
   size_t CParameterCount() const { return machine_sig_->parameter_count(); }
 
   // The number of JavaScript parameters to this call, including the receiver
   // object.
   size_t JSParameterCount() const { return js_param_count_; }
 
@@ skipping 104 matching lines @@
       Operator::Properties properties = Operator::kNoProperties,
       MachineType return_type = kMachAnyTagged);
 
   // Creates a call descriptor for simplified C calls that is appropriate
   // for the host platform. This simplified calling convention only supports
   // integers and pointers of one word size each, i.e. no floating point,
   // structs, pointers to members, etc.
   static CallDescriptor* GetSimplifiedCDescriptor(Zone* zone,
                                                   const MachineSignature* sig);
 
+  // Creates a call descriptor for interpreter handler code stubs. These are not
+  // intended to be called directly but are instead dispatched to by the
+  // interpreter.
+  static CallDescriptor* GetInterpreterDispatchDescriptor(
+      Zone* zone, const MachineSignature* sig);
+
   // Get the location of an (incoming) parameter to this function.
   LinkageLocation GetParameterLocation(int index) const {
     return incoming_->GetInputLocation(index + 1);  // + 1 to skip target.
   }
 
   // Get the machine type of an (incoming) parameter to this function.
   MachineType GetParameterType(int index) const {
     return incoming_->GetInputType(index + 1);  // + 1 to skip target.
   }
 
@@ skipping 27 matching lines @@
   CallDescriptor* const incoming_;
 
   DISALLOW_COPY_AND_ASSIGN(Linkage);
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_LINKAGE_H_