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/Support/SHA1.h"
12
13 namespace clang {
14 namespace clangd {
15
SymbolID(llvm::StringRef USR)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
raw() const22 llvm::StringRef SymbolID::raw() const {
23 return llvm::StringRef(reinterpret_cast<const char *>(HashValue.data()),
24 RawSize);
25 }
26
fromRaw(llvm::StringRef Raw)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
str() const34 std::string SymbolID::str() const { return llvm::toHex(raw()); }
35
fromStr(llvm::StringRef Str)36 llvm::Expected<SymbolID> SymbolID::fromStr(llvm::StringRef Str) {
37 if (Str.size() != RawSize * 2)
38 return error("Bad ID length");
39 for (char C : Str)
40 if (!llvm::isHexDigit(C))
41 return error("Bad hex ID");
42 return fromRaw(llvm::fromHex(Str));
43 }
44
operator <<(llvm::raw_ostream & OS,const SymbolID & ID)45 llvm::raw_ostream &operator<<(llvm::raw_ostream &OS, const SymbolID &ID) {
46 return OS << llvm::toHex(ID.raw());
47 }
48
hash_value(const SymbolID & ID)49 llvm::hash_code hash_value(const SymbolID &ID) {
50 // We already have a good hash, just return the first bytes.
51 static_assert(sizeof(size_t) <= SymbolID::RawSize,
52 "size_t longer than SHA1!");
53 size_t Result;
54 memcpy(&Result, ID.raw().data(), sizeof(size_t));
55 return llvm::hash_code(Result);
56 }
57
58 } // namespace clangd
59 } // namespace clang
60