Revert "Simplify TurboFan's c1visualizer file handling."

src/isolate.cc

 // Copyright 2012 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 <stdlib.h>
 
 #include <fstream>  // NOLINT(readability/streams)
 
 #include "src/v8.h"
 
@@ skipping 1933 matching lines @@
   clear_scheduled_exception();
 
   // Deserializing may put strange things in the root array's copy of the
   // stack guard.
   heap_.SetStackLimits();
 
   // Quiet the heap NaN if needed on target platform.
   if (!create_heap_objects) Assembler::QuietNaN(heap_.nan_value());
 
   if (FLAG_trace_turbo) {
-    // Create an empty file.
-    std::ofstream(GetTurboCfgFileName(), std::ios_base::trunc);
+    // Erase the file.
+    char buffer[512];
+    Vector<char> filename(buffer, sizeof(buffer));
+    GetTurboCfgFileName(filename);
+    std::ofstream turbo_cfg_stream(filename.start(),
+                                   std::fstream::out | std::fstream::trunc);
   }
 
   // If we are deserializing, log non-function code objects and compiled
   // functions found in the snapshot.
   if (!create_heap_objects &&
       (FLAG_log_code ||
        FLAG_ll_prof ||
        FLAG_perf_jit_prof ||
        FLAG_perf_basic_prof ||
        logger_->is_logging_code_events())) {
@@ skipping 395 matching lines @@
 
 
 BasicBlockProfiler* Isolate::GetOrCreateBasicBlockProfiler() {
   if (basic_block_profiler_ == NULL) {
     basic_block_profiler_ = new BasicBlockProfiler();
   }
   return basic_block_profiler_;
 }
 
 
-std::string Isolate::GetTurboCfgFileName() {
-  return FLAG_trace_turbo_cfg_file == NULL
-             ? "turbo-" + std::to_string(base::OS::GetCurrentProcessId()) +
-                   "-" + std::to_string(id()) + ".cfg"
-             : FLAG_trace_turbo_cfg_file;
+void Isolate::GetTurboCfgFileName(Vector<char> filename) {
+  if (FLAG_trace_turbo_cfg_file == NULL) {
+    SNPrintF(filename, "turbo-%d-%d.cfg", base::OS::GetCurrentProcessId(),
+             id());
+  } else {
+    StrNCpy(filename, FLAG_trace_turbo_cfg_file, filename.length());
+  }
 }
 
 
 bool StackLimitCheck::JsHasOverflowed() const {
   StackGuard* stack_guard = isolate_->stack_guard();
 #ifdef USE_SIMULATOR
   // The simulator uses a separate JS stack.
   Address jssp_address = Simulator::current(isolate_)->get_sp();
   uintptr_t jssp = reinterpret_cast<uintptr_t>(jssp_address);
   if (jssp < stack_guard->real_jslimit()) return true;
 #endif  // USE_SIMULATOR
   return GetCurrentStackPosition() < stack_guard->real_climit();
 }
 
 
 bool PostponeInterruptsScope::Intercept(StackGuard::InterruptFlag flag) {
   // First check whether the previous scope intercepts.
   if (prev_ && prev_->Intercept(flag)) return true;
   // Then check whether this scope intercepts.
   if ((flag & intercept_mask_)) {
     intercepted_flags_ |= flag;
     return true;
   }
   return false;
 }
 
 } }  // namespace v8::internal