clang-tools-extra/clangd/index/SymbolID.cpp

   1 //===--- SymbolID.cpp --------------------------------------------*- C++-*-===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #include "SymbolID.h"
  10 #include "support/Logger.h"
  11 #include "llvm/ADT/StringExtras.h"
  12 #include "llvm/Support/SHA1.h"
  13
  14 namespace clang {
  15 namespace clangd {
  16
  17 SymbolID::SymbolID(llvm::StringRef USR) {
  18   auto Hash = llvm::SHA1::hash(llvm::arrayRefFromStringRef(USR));
  19   static_assert(sizeof(Hash) >= RawSize, "RawSize larger than SHA1");
  20   memcpy(HashValue.data(), Hash.data(), RawSize);
  21 }
  22
  23 llvm::StringRef SymbolID::raw() const {
  24   return llvm::StringRef(reinterpret_cast<const char *>(HashValue.data()),
  25                          RawSize);
  26 }
  27
  28 SymbolID SymbolID::fromRaw(llvm::StringRef Raw) {
  29   SymbolID ID;
  30   assert(Raw.size() == RawSize);
  31   memcpy(ID.HashValue.data(), Raw.data(), RawSize);
  32   return ID;
  33 }
  34
  35 std::string SymbolID::str() const { return llvm::toHex(raw()); }
  36
  37 llvm::Expected<SymbolID> SymbolID::fromStr(llvm::StringRef Str) {
  38   if (Str.size() != RawSize * 2)
  39     return error("Bad ID length");
  40   for (char C : Str)
  41     if (!llvm::isHexDigit(C))
  42       return error("Bad hex ID");
  43   return fromRaw(llvm::fromHex(Str));
  44 }
  45
  46 llvm::raw_ostream &operator<<(llvm::raw_ostream &OS, const SymbolID &ID) {
  47   return OS << llvm::toHex(ID.raw());
  48 }
  49
  50 } // namespace clangd
  51 } // namespace clang