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//===- RemarkFormat.cpp --------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// Implementation of utilities to handle the different remark formats.
//
//===----------------------------------------------------------------------===//
#include "llvm/Remarks/RemarkFormat.h"
#include "llvm/ADT/StringSwitch.h"
#include "llvm/Remarks/BitstreamRemarkContainer.h"
using namespace llvm;
using namespace llvm::remarks;
Expected<Format> llvm::remarks::parseFormat(StringRef FormatStr) {
auto Result = StringSwitch<Format>(FormatStr)
.Cases("", "yaml", Format::YAML)
.Case("bitstream", Format::Bitstream)
.Default(Format::Unknown);
if (Result == Format::Unknown)
return createStringError(std::make_error_code(std::errc::invalid_argument),
"Unknown remark format: '%s'",
FormatStr.data());
return Result;
}
Expected<Format> llvm::remarks::magicToFormat(StringRef MagicStr) {
auto Result =
StringSwitch<Format>(MagicStr)
.StartsWith("--- ", Format::YAML) // This is only an assumption.
.StartsWith(remarks::Magic,
Format::YAML) // Needed for remark meta section
.StartsWith(remarks::ContainerMagic, Format::Bitstream)
.Default(Format::Unknown);
if (Result == Format::Unknown)
return createStringError(std::make_error_code(std::errc::invalid_argument),
"Automatic detection of remark format failed. "
"Unknown magic number: '%.4s'",
MagicStr.data());
return Result;
}
Expected<Format> llvm::remarks::detectFormat(Format Selected,
StringRef MagicStr) {
if (Selected == Format::Unknown)
return createStringError(std::make_error_code(std::errc::invalid_argument),
"Unknown remark parser format.");
if (Selected != Format::Auto)
return Selected;
// Empty files are valid bitstream files
if (MagicStr.empty())
return Format::Bitstream;
return magicToFormat(MagicStr);
}
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