mirror of
https://github.com/apple/swift.git
synced 2025-12-21 12:14:44 +01:00
76a7ceea64
Switch from a string core to a 128-bit integral core. This should make Fingerprints much cheaper to copy around and sets us up for a future where we can provide alternative implementations of the ambient hashing algorithm. rdar://72313506
55 lines
1.7 KiB
C++
55 lines
1.7 KiB
C++
//===--- 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();
|
|
}
|
|
|
|
Fingerprint Fingerprint::fromString(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;
|
|
}
|
|
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);
|
|
assert(*this == Fingerprint::fromString(Str));
|
|
return Str;
|
|
}
|