[turbofan] Simplify handling of JSON tracing files.

R=bmeurer@chromium.org

Review-Url: https://codereview.chromium.org/1977843002
Cr-Commit-Position: refs/heads/master@{#36242}

src/compiler/graph-visualizer.cc

@@ -25,9 +25,8 @@ namespace v8 {
 namespace internal {
 namespace compiler {
 
-
-FILE* OpenVisualizerLogFile(CompilationInfo* info, const char* phase,
-                            const char* suffix, const char* mode) {
+base::SmartArrayPointer<const char> GetVisualizerLogFileName(
+    CompilationInfo* info, const char* phase, const char* suffix) {
   EmbeddedVector<char, 256> filename(0);
   base::SmartArrayPointer<char> debug_name = info->GetDebugName();
   if (strlen(debug_name.get()) > 0) {
@@ -46,7 +45,11 @@ FILE* OpenVisualizerLogFile(CompilationInfo* info, const char* phase,
   } else {
     SNPrintF(full_filename, "%s-%s.%s", filename.start(), phase, suffix);
   }
-  return base::OS::FOpen(full_filename.start(), mode);
+
+  char* buffer = new char[full_filename.length() + 1];
+  memcpy(buffer, full_filename.start(), full_filename.length());
+  buffer[full_filename.length()] = '\0';
+  return base::SmartArrayPointer<const char>(buffer);
 }
 
 

src/compiler/graph-visualizer.h

@@ -8,6 +8,8 @@
 #include <stdio.h>
 #include <iosfwd>
 
+#include "src/base/smart-pointers.h"
+
 namespace v8 {
 namespace internal {
 
@@ -21,8 +23,8 @@ class RegisterAllocationData;
 class Schedule;
 class SourcePositionTable;
 
-FILE* OpenVisualizerLogFile(CompilationInfo* info, const char* phase,
-                            const char* suffix, const char* mode);
+base::SmartArrayPointer<const char> GetVisualizerLogFileName(
+    CompilationInfo* info, const char* phase, const char* suffix);
 
 struct AsJSON {
   AsJSON(const Graph& g, SourcePositionTable* p) : graph(g), positions(p) {}

src/compiler/pipeline.cc

@@ -400,13 +400,16 @@ struct TurboCfgFile : public std::ofstream {
                       std::ios_base::app) {}
 };
 
+struct TurboJsonFile : public std::ofstream {
+  TurboJsonFile(CompilationInfo* info, std::ios_base::openmode mode)
+      : std::ofstream(GetVisualizerLogFileName(info, nullptr, "json").get(),
+                      mode) {}
+};
 
 void TraceSchedule(CompilationInfo* info, Schedule* schedule) {
   if (FLAG_trace_turbo) {
     AllowHandleDereference allow_deref;
-    FILE* json_file = OpenVisualizerLogFile(info, nullptr, "json", "a+");
-    if (json_file != nullptr) {
-      OFStream json_of(json_file);
+    TurboJsonFile json_of(info, std::ios_base::app);
     json_of << "{\"name\":\"Schedule\",\"type\":\"schedule\",\"data\":\"";
     std::stringstream schedule_stream;
     schedule_stream << *schedule;
@@ -415,8 +418,6 @@ void TraceSchedule(CompilationInfo* info, Schedule* schedule) {
       json_of << AsEscapedUC16ForJSON(c);
     }
     json_of << "\"},\n";
-      fclose(json_file);
-    }
   }
   if (FLAG_trace_turbo_graph || FLAG_trace_turbo_scheduler) {
     AllowHandleDereference allow_deref;
@@ -526,9 +527,7 @@ PipelineStatistics* CreatePipelineStatistics(CompilationInfo* info,
   }
 
   if (FLAG_trace_turbo) {
-    FILE* json_file = OpenVisualizerLogFile(info, nullptr, "json", "w+");
-    if (json_file != nullptr) {
-      OFStream json_of(json_file);
+    TurboJsonFile json_of(info, std::ios_base::trunc);
     Handle<Script> script = info->script();
     base::SmartArrayPointer<char> function_name = info->GetDebugName();
     int pos = info->shared_info()->start_position();
@@ -538,15 +537,12 @@ PipelineStatistics* CreatePipelineStatistics(CompilationInfo* info,
       DisallowHeapAllocation no_allocation;
       int start = info->shared_info()->start_position();
       int len = info->shared_info()->end_position() - start;
-        String::SubStringRange source(String::cast(script->source()), start,
-                                      len);
+      String::SubStringRange source(String::cast(script->source()), start, len);
       for (const auto& c : source) {
         json_of << AsEscapedUC16ForJSON(c);
       }
     }
     json_of << "\",\n\"phases\":[";
-      fclose(json_file);
-    }
   }
 
   return pipeline_statistics;
@@ -667,13 +663,9 @@ PipelineWasmCompilationJob::CreateGraphImpl() {
 PipelineWasmCompilationJob::Status
 PipelineWasmCompilationJob::OptimizeGraphImpl() {
   if (FLAG_trace_turbo) {
-    FILE* json_file = OpenVisualizerLogFile(info(), nullptr, "json", "w+");
-    if (json_file != nullptr) {
-      OFStream json_of(json_file);
+    TurboJsonFile json_of(info(), std::ios_base::trunc);
     json_of << "{\"function\":\"" << info()->GetDebugName().get()
             << "\", \"source\":\"\",\n\"phases\":[";
-      fclose(json_file);
-    }
   }
 
   pipeline_.RunPrintAndVerify("Machine", true);
@@ -1309,12 +1301,9 @@ struct PrintGraphPhase {
 
     {  // Print JSON.
       AllowHandleDereference allow_deref;
-      FILE* json_file = OpenVisualizerLogFile(info, nullptr, "json", "a+");
-      if (json_file == nullptr) return;
-      OFStream json_of(json_file);
+      TurboJsonFile json_of(info, std::ios_base::app);
       json_of << "{\"name\":\"" << phase << "\",\"type\":\"graph\",\"data\":"
               << AsJSON(*graph, data->source_positions()) << "},\n";
-      fclose(json_file);
     }
 
     if (FLAG_trace_turbo_graph) {  // Simple textual RPO.
@@ -1509,13 +1498,9 @@ Handle<Code> Pipeline::GenerateCodeForCodeStub(Isolate* isolate,
   DCHECK_NOT_NULL(data.schedule());
 
   if (FLAG_trace_turbo) {
-    FILE* json_file = OpenVisualizerLogFile(&info, nullptr, "json", "w+");
-    if (json_file != nullptr) {
-      OFStream json_of(json_file);
+    TurboJsonFile json_of(&info, std::ios_base::trunc);
     json_of << "{\"function\":\"" << info.GetDebugName().get()
             << "\", \"source\":\"\",\n\"phases\":[";
-      fclose(json_file);
-    }
     pipeline.Run<PrintGraphPhase>("Machine");
   }
 
@@ -1564,13 +1549,9 @@ Handle<Code> Pipeline::GenerateCodeForTesting(CompilationInfo* info,
   PipelineImpl pipeline(&data);
 
   if (FLAG_trace_turbo) {
-    FILE* json_file = OpenVisualizerLogFile(info, nullptr, "json", "w+");
-    if (json_file != nullptr) {
-      OFStream json_of(json_file);
+    TurboJsonFile json_of(info, std::ios_base::trunc);
     json_of << "{\"function\":\"" << info->GetDebugName().get()
             << "\", \"source\":\"\",\n\"phases\":[";
-      fclose(json_file);
-    }
   }
   // TODO(rossberg): Should this really be untyped?
   pipeline.RunPrintAndVerify("Machine", true);
@@ -1689,11 +1670,8 @@ Handle<Code> PipelineImpl::GenerateCode(Linkage* linkage) {
   v8::internal::CodeGenerator::PrintCode(code, info());
 
   if (FLAG_trace_turbo) {
-    FILE* json_file = OpenVisualizerLogFile(info(), nullptr, "json", "a+");
-    if (json_file != nullptr) {
-      OFStream json_of(json_file);
-      json_of
-          << "{\"name\":\"disassembly\",\"type\":\"disassembly\",\"data\":\"";
+    TurboJsonFile json_of(info(), std::ios_base::app);
+    json_of << "{\"name\":\"disassembly\",\"type\":\"disassembly\",\"data\":\"";
 #if ENABLE_DISASSEMBLER
     std::stringstream disassembly_stream;
     code->Disassemble(nullptr, disassembly_stream);
@@ -1706,8 +1684,7 @@ Handle<Code> PipelineImpl::GenerateCode(Linkage* linkage) {
     json_of << "\"nodePositions\":";
     json_of << data->source_position_output();
     json_of << "}";
-      fclose(json_file);
-    }
+
     OFStream os(stdout);
     os << "---------------------------------------------------\n"
        << "Finished compiling method " << info()->GetDebugName().get()