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// 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_DIAGNOSTICS_CODE_TRACER_H_
#define V8_DIAGNOSTICS_CODE_TRACER_H_
#include "src/common/globals.h"
#include "src/flags/flags.h"
#include "src/utils/allocation.h"
#include "src/utils/utils.h"
#include "src/utils/vector.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_.begin(), "", 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_.begin(), "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_DIAGNOSTICS_CODE_TRACER_H_