forked from OSchip/llvm-project
60 lines
1.8 KiB
C++
60 lines
1.8 KiB
C++
//===--- SymbolID.cpp --------------------------------------------*- C++-*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "SymbolID.h"
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#include "support/Logger.h"
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#include "llvm/Support/SHA1.h"
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namespace clang {
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namespace clangd {
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SymbolID::SymbolID(llvm::StringRef USR) {
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auto Hash = llvm::SHA1::hash(llvm::arrayRefFromStringRef(USR));
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static_assert(sizeof(Hash) >= RawSize, "RawSize larger than SHA1");
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memcpy(HashValue.data(), Hash.data(), RawSize);
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}
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llvm::StringRef SymbolID::raw() const {
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return llvm::StringRef(reinterpret_cast<const char *>(HashValue.data()),
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RawSize);
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}
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SymbolID SymbolID::fromRaw(llvm::StringRef Raw) {
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SymbolID ID;
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assert(Raw.size() == RawSize);
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memcpy(ID.HashValue.data(), Raw.data(), RawSize);
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return ID;
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}
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std::string SymbolID::str() const { return llvm::toHex(raw()); }
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llvm::Expected<SymbolID> SymbolID::fromStr(llvm::StringRef Str) {
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if (Str.size() != RawSize * 2)
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return error("Bad ID length");
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for (char C : Str)
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if (!llvm::isHexDigit(C))
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return error("Bad hex ID");
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return fromRaw(llvm::fromHex(Str));
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}
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llvm::raw_ostream &operator<<(llvm::raw_ostream &OS, const SymbolID &ID) {
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return OS << llvm::toHex(ID.raw());
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}
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llvm::hash_code hash_value(const SymbolID &ID) {
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// We already have a good hash, just return the first bytes.
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static_assert(sizeof(size_t) <= SymbolID::RawSize,
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"size_t longer than SHA1!");
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size_t Result;
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memcpy(&Result, ID.raw().data(), sizeof(size_t));
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return llvm::hash_code(Result);
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}
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} // namespace clangd
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} // namespace clang
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