clang-tools  11.0.0
SymbolID.cpp
Go to the documentation of this file.
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 "llvm/Support/SHA1.h"
11 
12 namespace clang {
13 namespace clangd {
14 
15 SymbolID::SymbolID(llvm::StringRef USR) {
16  auto Hash = llvm::SHA1::hash(llvm::arrayRefFromStringRef(USR));
17  static_assert(sizeof(Hash) >= RawSize, "RawSize larger than SHA1");
18  memcpy(HashValue.data(), Hash.data(), RawSize);
19 }
20 
21 llvm::StringRef SymbolID::raw() const {
22  return llvm::StringRef(reinterpret_cast<const char *>(HashValue.data()),
23  RawSize);
24 }
25 
26 SymbolID SymbolID::fromRaw(llvm::StringRef Raw) {
27  SymbolID ID;
28  assert(Raw.size() == RawSize);
29  memcpy(ID.HashValue.data(), Raw.data(), RawSize);
30  return ID;
31 }
32 
33 std::string SymbolID::str() const { return llvm::toHex(raw()); }
34 
35 llvm::Expected<SymbolID> SymbolID::fromStr(llvm::StringRef Str) {
36  if (Str.size() != RawSize * 2)
37  return llvm::createStringError(llvm::inconvertibleErrorCode(),
38  "Bad ID length");
39  for (char C : Str)
40  if (!llvm::isHexDigit(C))
41  return llvm::createStringError(llvm::inconvertibleErrorCode(),
42  "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 llvm::hash_code hash_value(const SymbolID &ID) {
51  // We already have a good hash, just return the first bytes.
52  static_assert(sizeof(size_t) <= SymbolID::RawSize,
53  "size_t longer than SHA1!");
54  size_t Result;
55  memcpy(&Result, ID.raw().data(), sizeof(size_t));
56  return llvm::hash_code(Result);
57 }
58 
59 } // namespace clangd
60 } // namespace clang
SymbolID.h
clang::clangd::hash_value
llvm::hash_code hash_value(const SymbolID &ID)
Definition: SymbolID.cpp:50
clang::clangd::SymbolID::RawSize
constexpr static size_t RawSize
Definition: SymbolID.h:48
clang::clangd::SymbolID::str
std::string str() const
Definition: SymbolID.cpp:33
clang::clangd::operator<<
llvm::raw_ostream & operator<<(llvm::raw_ostream &OS, const CodeCompletion &C)
Definition: CodeComplete.cpp:1912
clang::clangd::SymbolID::fromRaw
static SymbolID fromRaw(llvm::StringRef)
Definition: SymbolID.cpp:26
clang::clangd::SymbolID::fromStr
static llvm::Expected< SymbolID > fromStr(llvm::StringRef)
Definition: SymbolID.cpp:35
clang
===– Representation.cpp - ClangDoc Representation --------—*- C++ -*-===//
Definition: ApplyReplacements.h:27
OS
llvm::raw_string_ostream OS
Definition: TraceTests.cpp:162
clang::clangd::SymbolID::SymbolID
SymbolID()=default
clang::clangd::SymbolID::raw
llvm::StringRef raw() const
Definition: SymbolID.cpp:21
clang::clangd::SymbolID
Definition: SymbolID.h:31