Emit unwinding information for TurboFan code.

src/compiler/code-generator.cc

Index: src/compiler/code-generator.cc
diff --git a/src/compiler/code-generator.cc b/src/compiler/code-generator.cc
index 71c6418ecc6aa4d3af50e757afed41c2bdc61771..1b1654117e0cdd87101003e0f7efe4050a9f750f 100644
--- a/src/compiler/code-generator.cc
+++ b/src/compiler/code-generator.cc
@@ -59,6 +59,9 @@ CodeGenerator::CodeGenerator(Frame* frame, Linkage* linkage,
     new (&labels_[i]) Label;
   }
   CreateFrameAccessState(frame);
+  if (FLAG_perf_prof_unwinding_info) {
+    unwinding_info_writer_.Reset(new UnwindingInfoWriter);
+  }
 }
 
 void CodeGenerator::CreateFrameAccessState(Frame* frame) {
@@ -112,6 +115,10 @@ Handle<Code> CodeGenerator::GenerateCode() {
       if (block->IsHandler()) EnsureSpaceForLazyDeopt();
       // Bind a label for a block.
       current_block_ = block->rpo_number();
+      if (!unwinding_info_writer_.is_empty()) {
+        unwinding_info_writer_->BeginInstructionBlock(masm()->pc_offset(),
+                                                      block);
+      }
       if (FLAG_code_comments) {
         // TODO(titzer): these code comments are a giant memory leak.
         Vector<char> buffer = Vector<char>::New(200);
@@ -162,6 +169,9 @@ Handle<Code> CodeGenerator::GenerateCode() {
         result = AssembleBlock(block);
       }
       if (result != kSuccess) return Handle<Code>();
+      if (!unwinding_info_writer_.is_empty()) {
+        unwinding_info_writer_->EndInstructionBlock(block);
+      }
     }
   }
 
@@ -202,8 +212,14 @@ Handle<Code> CodeGenerator::GenerateCode() {
 
   safepoints()->Emit(masm(), frame()->GetTotalFrameSlotCount());
 
-  Handle<Code> result =
-      v8::internal::CodeGenerator::MakeCodeEpilogue(masm(), nullptr, info);
+  EhFrameWriter* eh_frame_writer = nullptr;
+  if (!unwinding_info_writer_.is_empty()) {
+    unwinding_info_writer_->Finish(masm()->pc_offset());
+    eh_frame_writer = unwinding_info_writer_->eh_frame_writer();
+  }
+
+  Handle<Code> result = v8::internal::CodeGenerator::MakeCodeEpilogue(
+      masm(), eh_frame_writer, info);
   result->set_is_turbofanned(true);
   result->set_stack_slots(frame()->GetTotalFrameSlotCount());
   result->set_safepoint_table_offset(safepoints()->GetCodeOffset());