clang-tools  8.0.0
SymbolID.cpp
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1 //===--- SymbolID.cpp --------------------------------------------*- C++-*-===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 
10 #include "SymbolID.h"
11 #include "llvm/Support/SHA1.h"
12 
13 namespace clang {
14 namespace clangd {
15 
16 SymbolID::SymbolID(llvm::StringRef USR) {
17  auto Hash = llvm::SHA1::hash(llvm::arrayRefFromStringRef(USR));
18  static_assert(sizeof(Hash) >= RawSize, "RawSize larger than SHA1");
19  memcpy(HashValue.data(), Hash.data(), RawSize);
20 }
21 
22 llvm::StringRef SymbolID::raw() const {
23  return llvm::StringRef(reinterpret_cast<const char *>(HashValue.data()),
24  RawSize);
25 }
26 
27 SymbolID SymbolID::fromRaw(llvm::StringRef Raw) {
28  SymbolID ID;
29  assert(Raw.size() == RawSize);
30  memcpy(ID.HashValue.data(), Raw.data(), RawSize);
31  return ID;
32 }
33 
34 std::string SymbolID::str() const { return llvm::toHex(raw()); }
35 
36 llvm::Expected<SymbolID> SymbolID::fromStr(llvm::StringRef Str) {
37  if (Str.size() != RawSize * 2)
38  return llvm::createStringError(llvm::inconvertibleErrorCode(),
39  "Bad ID length");
40  for (char C : Str)
41  if (!llvm::isHexDigit(C))
42  return llvm::createStringError(llvm::inconvertibleErrorCode(),
43  "Bad hex ID");
44  return fromRaw(llvm::fromHex(Str));
45 }
46 
47 llvm::raw_ostream &operator<<(llvm::raw_ostream &OS, const SymbolID &ID) {
48  return OS << llvm::toHex(ID.raw());
49 }
50 
51 llvm::hash_code hash_value(const SymbolID &ID) {
52  // We already have a good hash, just return the first bytes.
53  assert(sizeof(size_t) <= SymbolID::RawSize && "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
static SymbolID fromRaw(llvm::StringRef)
Definition: SymbolID.cpp:27
static llvm::Expected< SymbolID > fromStr(llvm::StringRef)
Definition: SymbolID.cpp:36
static constexpr size_t RawSize
Definition: SymbolID.h:45
std::string str() const
Definition: SymbolID.cpp:34
llvm::Optional< llvm::Expected< tooling::AtomicChanges > > Result
===– Representation.cpp - ClangDoc Representation --------—*- C++ -*-===//
llvm::StringRef raw() const
Definition: SymbolID.cpp:22
llvm::hash_code hash_value(const SymbolID &ID)
Definition: SymbolID.cpp:51
llvm::raw_ostream & operator<<(llvm::raw_ostream &OS, const CodeCompletion &C)