1 files changed, 83 insertions, 0 deletions
diff --git a/deps/v8/src/code-tracer.h b/deps/v8/src/code-tracer.h
new file mode 100644
index 0000000000..3ed07be77e
--- /dev/null
+++ b/deps/v8/src/code-tracer.h
@@ -0,0 +1,83 @@
+// Copyright 2018 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.
+
+#ifndef V8_CODE_TRACER_H_
+#define V8_CODE_TRACER_H_
+
+#include "src/allocation.h"
+#include "src/flags.h"
+#include "src/globals.h"
+#include "src/utils.h"
+
+namespace v8 {
+namespace internal {
+
+class CodeTracer final : public Malloced {
+ public:
+  explicit CodeTracer(int isolate_id) : file_(nullptr), scope_depth_(0) {
+    if (!ShouldRedirect()) {
+      file_ = stdout;
+      return;
+    }
+
+    if (FLAG_redirect_code_traces_to != nullptr) {
+      StrNCpy(filename_, FLAG_redirect_code_traces_to, filename_.length());
+    } else if (isolate_id >= 0) {
+      SNPrintF(filename_, "code-%d-%d.asm", base::OS::GetCurrentProcessId(),
+               isolate_id);
+    } else {
+      SNPrintF(filename_, "code-%d.asm", base::OS::GetCurrentProcessId());
+    }
+
+    WriteChars(filename_.start(), "", 0, false);
+  }
+
+  class Scope {
+   public:
+    explicit Scope(CodeTracer* tracer) : tracer_(tracer) { tracer->OpenFile(); }
+    ~Scope() { tracer_->CloseFile(); }
+
+    FILE* file() const { return tracer_->file(); }
+
+   private:
+    CodeTracer* tracer_;
+  };
+
+  void OpenFile() {
+    if (!ShouldRedirect()) {
+      return;
+    }
+
+    if (file_ == nullptr) {
+      file_ = base::OS::FOpen(filename_.start(), "ab");
+    }
+
+    scope_depth_++;
+  }
+
+  void CloseFile() {
+    if (!ShouldRedirect()) {
+      return;
+    }
+
+    if (--scope_depth_ == 0) {
+      fclose(file_);
+      file_ = nullptr;
+    }
+  }
+
+  FILE* file() const { return file_; }
+
+ private:
+  static bool ShouldRedirect() { return FLAG_redirect_code_traces; }
+
+  EmbeddedVector<char, 128> filename_;
+  FILE* file_;
+  int scope_depth_;
+};
+
+}  // namespace internal
+}  // namespace v8
+
+#endif  // V8_CODE_TRACER_H_