[turbofan] Factor C call descriptor building into compiler/c-linkage.cc.

src/compiler/linkage-impl.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_IMPL_H_
 #define V8_COMPILER_LINKAGE_IMPL_H_
 
 #include "src/code-stubs.h"
 #include "src/compiler/osr.h"
 
@@ skipping 179 matching lines @@
         types.Build(),                    // machine_sig
         locations.Build(),                // location_sig
         js_parameter_count,               // js_parameter_count
         properties,                       // properties
         kNoCalleeSaved,                   // callee-saved registers
         kNoCalleeSaved,                   // callee-saved fp
         flags,                            // flags
         descriptor.DebugName(isolate));
   }
 
-  static CallDescriptor* GetSimplifiedCDescriptor(
-      Zone* zone, const MachineSignature* msig) {
-    LocationSignature::Builder locations(zone, msig->return_count(),
-                                         msig->parameter_count());
-    // Add return location(s).
-    AddReturnLocations(&locations);
-
-    // Add register and/or stack parameter(s).
-    const int parameter_count = static_cast<int>(msig->parameter_count());
-    int stack_offset = LinkageTraits::CStackBackingStoreLength();
-    for (int i = 0; i < parameter_count; i++) {
-      if (i < LinkageTraits::CRegisterParametersLength()) {
-        locations.AddParam(regloc(LinkageTraits::CRegisterParameter(i)));
-      } else {
-        locations.AddParam(stackloc(-1 - stack_offset));
-        stack_offset++;
-      }
-    }
-
-    // The target for C calls is always an address (i.e. machine pointer).
-    MachineType target_type = kMachPtr;
-    LinkageLocation target_loc = LinkageLocation::AnyRegister();
-    return new (zone) CallDescriptor(             // --
-        CallDescriptor::kCallAddress,             // kind
-        target_type,                              // target MachineType
-        target_loc,                               // target location
-        msig,                                     // machine_sig
-        locations.Build(),                        // location_sig
-        0,                                        // js_parameter_count
-        Operator::kNoProperties,                  // properties
-        LinkageTraits::CCalleeSaveRegisters(),    // callee-saved registers
-        LinkageTraits::CCalleeSaveFPRegisters(),  // callee-saved fp regs
-        CallDescriptor::kNoFlags,                 // flags
-        "c-call");
-  }
-
   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.
     STATIC_ASSERT(0 == Linkage::kInterpreterBytecodeParameter);
     types.AddParam(kMachPtr);
     locations.AddParam(regloc(LinkageTraits::InterpreterBytecodePointerReg()));
 
     STATIC_ASSERT(1 == Linkage::kInterpreterDispatchTableParameter);
@@ skipping 76 matching lines @@
     int parameter_index = 1 + index;  // skip index 0, which is the target.
     return incoming_->GetInputLocation(parameter_index);
   }
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_LINKAGE_IMPL_H_