Convert Linkage to use MachineSignature.

src/compiler/x64/linkage-x64.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/v8.h"
 
 #include "src/assembler.h"
 #include "src/code-stubs.h"
 #include "src/compiler/linkage.h"
 #include "src/compiler/linkage-impl.h"
 #include "src/zone.h"
 
 namespace v8 {
 namespace internal {
 namespace compiler {
 
 #ifdef _WIN64
 const bool kWin64 = true;
 #else
 const bool kWin64 = false;
 #endif
 
-struct LinkageHelperTraits {
+struct X64LinkageHelperTraits {
   static Register ReturnValueReg() { return rax; }
   static Register ReturnValue2Reg() { return rdx; }
   static Register JSCallFunctionReg() { return rdi; }
   static Register ContextReg() { return rsi; }
   static Register RuntimeCallFunctionReg() { return rbx; }
   static Register RuntimeCallArgCountReg() { return rax; }
   static RegList CCalleeSaveRegisters() {
     if (kWin64) {
       return rbx.bit() | rdi.bit() | rsi.bit() | r12.bit() | r13.bit() |
              r14.bit() | r15.bit();
     } else {
       return rbx.bit() | r12.bit() | r13.bit() | r14.bit() | r15.bit();
     }
   }
   static Register CRegisterParameter(int i) {
     if (kWin64) {
       static Register register_parameters[] = {rcx, rdx, r8, r9};
       return register_parameters[i];
     } else {
       static Register register_parameters[] = {rdi, rsi, rdx, rcx, r8, r9};
       return register_parameters[i];
     }
   }
   static int CRegisterParametersLength() { return kWin64 ? 4 : 6; }
 };
 
+typedef LinkageHelper<X64LinkageHelperTraits> LH;
 
 CallDescriptor* Linkage::GetJSCallDescriptor(int parameter_count, Zone* zone) {
-  return LinkageHelper::GetJSCallDescriptor<LinkageHelperTraits>(
-      zone, parameter_count);
+  return LH::GetJSCallDescriptor(zone, parameter_count);
 }
 
 
 CallDescriptor* Linkage::GetRuntimeCallDescriptor(
     Runtime::FunctionId function, int parameter_count,
     Operator::Properties properties, Zone* zone) {
-  return LinkageHelper::GetRuntimeCallDescriptor<LinkageHelperTraits>(
-      zone, function, parameter_count, properties);
+  return LH::GetRuntimeCallDescriptor(zone, function, parameter_count,
+                                      properties);
 }
 
 
 CallDescriptor* Linkage::GetStubCallDescriptor(
     CodeStubInterfaceDescriptor* descriptor, int stack_parameter_count,
     CallDescriptor::Flags flags, Zone* zone) {
-  return LinkageHelper::GetStubCallDescriptor<LinkageHelperTraits>(
-      zone, descriptor, stack_parameter_count, flags);
+  return LH::GetStubCallDescriptor(zone, descriptor, stack_parameter_count,
+                                   flags);
 }
 
 
-CallDescriptor* Linkage::GetSimplifiedCDescriptor(
-    Zone* zone, int num_params, MachineType return_type,
-    const MachineType* param_types) {
-  return LinkageHelper::GetSimplifiedCDescriptor<LinkageHelperTraits>(
-      zone, num_params, return_type, param_types);
+CallDescriptor* Linkage::GetSimplifiedCDescriptor(Zone* zone,
+                                                  MachineSignature* sig) {
+  return LH::GetSimplifiedCDescriptor(zone, sig);
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8