// 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_