[stubs] A new approach to TF stubs

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/ast/scopes.h"
 #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"
@@ skipping 158 matching lines @@
     case Runtime::kReThrow:
     case Runtime::kStringCompare:
     case Runtime::kStringEquals:
     case Runtime::kToFastProperties:  // TODO(jarin): Is it safe?
     case Runtime::kTraceEnter:
     case Runtime::kTraceExit:
       return 0;
     case Runtime::kInlineArguments:
     case Runtime::kInlineArgumentsLength:
     case Runtime::kInlineDefaultConstructorCallSuper:
-    case Runtime::kInlineGetCallerJSFunction:
     case Runtime::kInlineGetPrototype:
     case Runtime::kInlineRegExpExec:
     case Runtime::kInlineSubString:
     case Runtime::kInlineToInteger:
     case Runtime::kInlineToLength:
     case Runtime::kInlineToName:
     case Runtime::kInlineToNumber:
     case Runtime::kInlineToObject:
     case Runtime::kInlineToPrimitive_Number:
     case Runtime::kInlineToPrimitive_String:
@@ skipping 24 matching lines @@
   }
   for (size_t i = 0; i < ReturnCount(); ++i) {
     if (!GetReturnLocation(i).IsRegister()) return false;
   }
   return true;
 }
 
 
 CallDescriptor* Linkage::GetRuntimeCallDescriptor(
     Zone* zone, Runtime::FunctionId function_id, int js_parameter_count,
-    Operator::Properties properties, bool needs_frame_state) {
+    Operator::Properties properties, CallDescriptor::Flags flags) {
   const size_t function_count = 1;
   const size_t num_args_count = 1;
   const size_t context_count = 1;
   const size_t parameter_count = function_count +
                                  static_cast<size_t>(js_parameter_count) +
                                  num_args_count + context_count;
 
   const Runtime::Function* function = Runtime::FunctionForId(function_id);
   const size_t return_count = static_cast<size_t>(function->result_size);
 
@@ skipping 22 matching lines @@
   types.AddParam(kMachAnyTagged);
 
   // Add runtime call argument count.
   locations.AddParam(regloc(kRuntimeCallArgCountRegister));
   types.AddParam(kMachPtr);
 
   // Add context.
   locations.AddParam(regloc(kContextRegister));
   types.AddParam(kMachAnyTagged);
 
-  CallDescriptor::Flags flags =
-      needs_frame_state && (Linkage::FrameStateInputCount(function_id) > 0)
-          ? CallDescriptor::kNeedsFrameState
-          : CallDescriptor::kNoFlags;
+  if (Linkage::FrameStateInputCount(function_id) == 0) {
+    flags = static_cast<CallDescriptor::Flags>(
+        flags & ~CallDescriptor::kNeedsFrameState);
+  }
 
   // The target for runtime calls is a code object.
   MachineType target_type = kMachAnyTagged;
   LinkageLocation target_loc = LinkageLocation::ForAnyRegister();
   return new (zone) CallDescriptor(     // --
       CallDescriptor::kCallCodeObject,  // kind
       target_type,                      // target MachineType
       target_loc,                       // target location
       types.Build(),                    // machine_sig
       locations.Build(),                // location_sig
@@ skipping 242 matching lines @@
   } else {
     DCHECK(loc == regloc(kContextRegister));
     return LinkageLocation::ForCalleeFrameSlot(Frame::kContextSlot);
   }
 }
 
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8