[TurboFan]: Add JSON output for the visualizer

src/compiler/pipeline.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/compiler/pipeline.h"
 
 #include "src/base/platform/elapsed-timer.h"
 #include "src/compiler/ast-graph-builder.h"
 #include "src/compiler/change-lowering.h"
 #include "src/compiler/code-generator.h"
@@ skipping 77 matching lines @@
 
 
 void Pipeline::VerifyAndPrintGraph(Graph* graph, const char* phase) {
   if (FLAG_trace_turbo) {
     char buffer[256];
     Vector<char> filename(buffer, sizeof(buffer));
     if (!info_->shared_info().is_null()) {
       SmartArrayPointer<char> functionname =
           info_->shared_info()->DebugName()->ToCString();
       if (strlen(functionname.get()) > 0) {
-        SNPrintF(filename, "turbo-%s-%s.dot", functionname.get(), phase);
+        SNPrintF(filename, "turbo-%s-%s.json", functionname.get(), phase);
       } else {
-        SNPrintF(filename, "turbo-%p-%s.dot", static_cast<void*>(info_), phase);
+        SNPrintF(filename, "turbo-%p-%s.json", static_cast<void*>(info_),
+                 phase);
       }
     } else {
-      SNPrintF(filename, "turbo-none-%s.dot", phase);
+      SNPrintF(filename, "turbo-none-%s.json", phase);
     }
     std::replace(filename.start(), filename.start() + filename.length(), ' ',
                  '_');
     FILE* file = base::OS::FOpen(filename.start(), "w+");
     OFStream of(file);
-    of << AsDOT(*graph);
+    of << AsJSON(*graph);

[Michael Starzinger, 2014/09/25 11:02:50]

This seems to disable dumping of ".dot" files, I think for now we should still
keep dumping them.

     fclose(file);
 
     OFStream os(stdout);
     os << "-- " << phase << " graph printed to file " << filename.start()
        << "\n";
   }
   if (VerifyGraphs()) Verifier::Run(graph);
 }
 
 
@@ skipping 293 matching lines @@
 }
 
 
 void Pipeline::TearDown() {
   InstructionOperand::TearDownCaches();
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8