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//===--- Fingerprint.cpp - A stable identity for compiler data --*- C++ -*-===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2020 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
#include "swift/Basic/Fingerprint.h"
#include "swift/Basic/STLExtras.h"
#include "llvm/Support/Format.h"
#include "llvm/Support/raw_ostream.h"
#include <inttypes.h>
#include <sstream>
using namespace swift;
llvm::raw_ostream &llvm::operator<<(llvm::raw_ostream &OS,
const Fingerprint &FP) {
return OS << FP.getRawValue();
}
void swift::simple_display(llvm::raw_ostream &out, const Fingerprint &fp) {
out << fp.getRawValue();
}
std::optional<Fingerprint> Fingerprint::fromString(llvm::StringRef value) {
assert(value.size() == Fingerprint::DIGEST_LENGTH &&
"Only supports 32-byte hash values!");
auto fp = Fingerprint::ZERO();
{
std::istringstream s(value.drop_back(Fingerprint::DIGEST_LENGTH/2).str());
s >> std::hex >> fp.core.first;
}
{
std::istringstream s(value.drop_front(Fingerprint::DIGEST_LENGTH/2).str());
s >> std::hex >> fp.core.second;
}
// If the input string is not valid hex, the conversion above can fail.
if (value != fp.getRawValue())
return std::nullopt;
return fp;
}
llvm::SmallString<Fingerprint::DIGEST_LENGTH> Fingerprint::getRawValue() const {
llvm::SmallString<Fingerprint::DIGEST_LENGTH> Str;
llvm::raw_svector_ostream Res(Str);
Res << llvm::format_hex_no_prefix(core.first, 16);
Res << llvm::format_hex_no_prefix(core.second, 16);
return Str;
}
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