[turbofan] Move frame elision logic to the end

src/compiler/frame-elider.cc

 // Copyright 2015 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/compiler/frame-elider.h"
 #include "src/base/adapters.h"
-#include "src/compiler/frame-elider.h"
+#include "src/compiler/linkage.h"
 
 namespace v8 {
 namespace internal {
 namespace compiler {
 
 FrameElider::FrameElider(InstructionSequence* code) : code_(code) {}
 
-void FrameElider::Run() {
-  MarkBlocks();
+void FrameElider::Run(const CallDescriptor* descriptor) {
+  if (descriptor != nullptr && descriptor->RequiresFrameAsIncoming()) {

[danno, 2016/03/18 18:13:00]

Passing in the CallDescriptor here seems weird. I liked the old way better. Can
you not just mark the first block externally in the pipeline?

[Mircea Trofin, 2016/03/18 18:22:31]

Done.

+    instruction_blocks()[0]->mark_needs_frame();
+  } else {
+    MarkBlocks();
+  }
   PropagateMarks();
   MarkDeConstruction();
 }
 
 
 void FrameElider::MarkBlocks() {
   for (InstructionBlock* block : instruction_blocks()) {
     if (block->needs_frame()) continue;
     for (int i = block->code_start(); i < block->code_end(); ++i) {
       if (InstructionAt(i)->IsCall() ||
@@ skipping 96 matching lines @@
 }
 
 
 Instruction* FrameElider::InstructionAt(int index) const {
   return code_->InstructionAt(index);
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8