SymbolID.cpp
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//===--- SymbolID.cpp --------------------------------------------*- C++-*-===//
//
// 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
//
//===----------------------------------------------------------------------===//
#include "SymbolID.h"
#include "support/Logger.h"
#include "llvm/Support/SHA1.h"
namespace clang {
namespace clangd {
SymbolID::SymbolID(llvm::StringRef USR) {
auto Hash = llvm::SHA1::hash(llvm::arrayRefFromStringRef(USR));
static_assert(sizeof(Hash) >= RawSize, "RawSize larger than SHA1");
memcpy(HashValue.data(), Hash.data(), RawSize);
}
llvm::StringRef SymbolID::raw() const {
return llvm::StringRef(reinterpret_cast<const char *>(HashValue.data()),
RawSize);
}
SymbolID SymbolID::fromRaw(llvm::StringRef Raw) {
SymbolID ID;
assert(Raw.size() == RawSize);
memcpy(ID.HashValue.data(), Raw.data(), RawSize);
return ID;
}
std::string SymbolID::str() const { return llvm::toHex(raw()); }
llvm::Expected<SymbolID> SymbolID::fromStr(llvm::StringRef Str) {
if (Str.size() != RawSize * 2)
return error("Bad ID length");
for (char C : Str)
if (!llvm::isHexDigit(C))
return error("Bad hex ID");
return fromRaw(llvm::fromHex(Str));
}
llvm::raw_ostream &operator<<(llvm::raw_ostream &OS, const SymbolID &ID) {
return OS << llvm::toHex(ID.raw());
}
llvm::hash_code hash_value(const SymbolID &ID) {
// We already have a good hash, just return the first bytes.
static_assert(sizeof(size_t) <= SymbolID::RawSize,
"size_t longer than SHA1!");
size_t Result;
memcpy(&Result, ID.raw().data(), sizeof(size_t));
return llvm::hash_code(Result);
}
} // namespace clangd
} // namespace clang