1 // Copyright 2018 the V8 project authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef V8_CODE_TRACER_H_ 6 #define V8_CODE_TRACER_H_ 7 8 #include "src/allocation.h" 9 #include "src/flags.h" 10 #include "src/globals.h" 11 #include "src/utils.h" 12 13 namespace v8 { 14 namespace internal { 15 16 class CodeTracer final : public Malloced { 17 public: CodeTracer(int isolate_id)18 explicit CodeTracer(int isolate_id) : file_(nullptr), scope_depth_(0) { 19 if (!ShouldRedirect()) { 20 file_ = stdout; 21 return; 22 } 23 24 if (FLAG_redirect_code_traces_to != nullptr) { 25 StrNCpy(filename_, FLAG_redirect_code_traces_to, filename_.length()); 26 } else if (isolate_id >= 0) { 27 SNPrintF(filename_, "code-%d-%d.asm", base::OS::GetCurrentProcessId(), 28 isolate_id); 29 } else { 30 SNPrintF(filename_, "code-%d.asm", base::OS::GetCurrentProcessId()); 31 } 32 33 WriteChars(filename_.start(), "", 0, false); 34 } 35 36 class Scope { 37 public: Scope(CodeTracer * tracer)38 explicit Scope(CodeTracer* tracer) : tracer_(tracer) { tracer->OpenFile(); } ~Scope()39 ~Scope() { tracer_->CloseFile(); } 40 file()41 FILE* file() const { return tracer_->file(); } 42 43 private: 44 CodeTracer* tracer_; 45 }; 46 OpenFile()47 void OpenFile() { 48 if (!ShouldRedirect()) { 49 return; 50 } 51 52 if (file_ == nullptr) { 53 file_ = base::OS::FOpen(filename_.start(), "ab"); 54 } 55 56 scope_depth_++; 57 } 58 CloseFile()59 void CloseFile() { 60 if (!ShouldRedirect()) { 61 return; 62 } 63 64 if (--scope_depth_ == 0) { 65 fclose(file_); 66 file_ = nullptr; 67 } 68 } 69 file()70 FILE* file() const { return file_; } 71 72 private: ShouldRedirect()73 static bool ShouldRedirect() { return FLAG_redirect_code_traces; } 74 75 EmbeddedVector<char, 128> filename_; 76 FILE* file_; 77 int scope_depth_; 78 }; 79 80 } // namespace internal 81 } // namespace v8 82 83 #endif // V8_CODE_TRACER_H_ 84