xref: /freebsd/contrib/llvm-project/llvm/lib/Remarks/RemarkStringTable.cpp (revision 2f513db72b034fd5ef7f080b11be5c711c15186a)
1 //===- RemarkStringTable.cpp ----------------------------------------------===//
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 // Implementation of the Remark string table used at remark generation.
10 //
11 //===----------------------------------------------------------------------===//
12 
13 #include "llvm/Remarks/RemarkStringTable.h"
14 #include "llvm/Support/EndianStream.h"
15 #include "llvm/Support/Error.h"
16 #include <vector>
17 
18 using namespace llvm;
19 using namespace llvm::remarks;
20 
21 std::pair<unsigned, StringRef> StringTable::add(StringRef Str) {
22   size_t NextID = StrTab.size();
23   auto KV = StrTab.insert({Str, NextID});
24   // If it's a new string, add it to the final size.
25   if (KV.second)
26     SerializedSize += KV.first->first().size() + 1; // +1 for the '\0'
27   // Can be either NextID or the previous ID if the string is already there.
28   return {KV.first->second, KV.first->first()};
29 }
30 
31 void StringTable::serialize(raw_ostream &OS) const {
32   // Emit the number of strings.
33   uint64_t StrTabSize = SerializedSize;
34   support::endian::write(OS, StrTabSize, support::little);
35   // Emit the sequence of strings.
36   for (StringRef Str : serialize()) {
37     OS << Str;
38     // Explicitly emit a '\0'.
39     OS.write('\0');
40   }
41 }
42 
43 std::vector<StringRef> StringTable::serialize() const {
44   std::vector<StringRef> Strings{StrTab.size()};
45   for (const auto &KV : StrTab)
46     Strings[KV.second] = KV.first();
47   return Strings;
48 }
49