// Copyright 2018 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef V8_CODE_TRACER_H_
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#define V8_CODE_TRACER_H_
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#include "src/allocation.h"
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#include "src/flags.h"
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#include "src/globals.h"
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#include "src/utils.h"
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namespace v8 {
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namespace internal {
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class CodeTracer final : public Malloced {
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public:
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explicit CodeTracer(int isolate_id) : file_(nullptr), scope_depth_(0) {
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if (!ShouldRedirect()) {
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file_ = stdout;
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return;
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}
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if (FLAG_redirect_code_traces_to != nullptr) {
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StrNCpy(filename_, FLAG_redirect_code_traces_to, filename_.length());
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} else if (isolate_id >= 0) {
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SNPrintF(filename_, "code-%d-%d.asm", base::OS::GetCurrentProcessId(),
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isolate_id);
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} else {
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SNPrintF(filename_, "code-%d.asm", base::OS::GetCurrentProcessId());
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}
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WriteChars(filename_.start(), "", 0, false);
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}
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class Scope {
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public:
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explicit Scope(CodeTracer* tracer) : tracer_(tracer) { tracer->OpenFile(); }
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~Scope() { tracer_->CloseFile(); }
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FILE* file() const { return tracer_->file(); }
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private:
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CodeTracer* tracer_;
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};
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void OpenFile() {
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if (!ShouldRedirect()) {
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return;
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}
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if (file_ == nullptr) {
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file_ = base::OS::FOpen(filename_.start(), "ab");
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}
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scope_depth_++;
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}
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void CloseFile() {
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if (!ShouldRedirect()) {
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return;
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}
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if (--scope_depth_ == 0) {
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fclose(file_);
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file_ = nullptr;
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}
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}
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FILE* file() const { return file_; }
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private:
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static bool ShouldRedirect() { return FLAG_redirect_code_traces; }
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EmbeddedVector<char, 128> filename_;
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FILE* file_;
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int scope_depth_;
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};
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} // namespace internal
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} // namespace v8
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#endif // V8_CODE_TRACER_H_
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