llvm/lib/Remarks/RemarkStringTable.cpp

   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/ADT/StringRef.h"
  15 #include "llvm/Remarks/Remark.h"
  16 #include "llvm/Remarks/RemarkParser.h"
  17 #include "llvm/Support/raw_ostream.h"
  18 #include <vector>
  19
  20 using namespace llvm;
  21 using namespace llvm::remarks;
  22
  23 StringTable::StringTable(const ParsedStringTable &Other) {
  24   for (unsigned i = 0, e = Other.size(); i < e; ++i)
  25     if (Expected<StringRef> MaybeStr = Other[i])
  26       add(*MaybeStr);
  27     else
  28       llvm_unreachable("Unexpected error while building remarks string table.");
  29 }
  30
  31 std::pair<unsigned, StringRef> StringTable::add(StringRef Str) {
  32   size_t NextID = StrTab.size();
  33   auto KV = StrTab.insert({Str, NextID});
  34   // If it's a new string, add it to the final size.
  35   if (KV.second)
  36     SerializedSize += KV.first->first().size() + 1; // +1 for the '\0'
  37   // Can be either NextID or the previous ID if the string is already there.
  38   return {KV.first->second, KV.first->first()};
  39 }
  40
  41 void StringTable::internalize(Remark &R) {
  42   auto Impl = [&](StringRef &S) { S = add(S).second; };
  43   Impl(R.PassName);
  44   Impl(R.RemarkName);
  45   Impl(R.FunctionName);
  46   if (R.Loc)
  47     Impl(R.Loc->SourceFilePath);
  48   for (Argument &Arg : R.Args) {
  49     Impl(Arg.Key);
  50     Impl(Arg.Val);
  51     if (Arg.Loc)
  52       Impl(Arg.Loc->SourceFilePath);
  53   }
  54 }
  55
  56 void StringTable::serialize(raw_ostream &OS) const {
  57   // Emit the sequence of strings.
  58   for (StringRef Str : serialize()) {
  59     OS << Str;
  60     // Explicitly emit a '\0'.
  61     OS.write('\0');
  62   }
  63 }
  64
  65 std::vector<StringRef> StringTable::serialize() const {
  66   std::vector<StringRef> Strings{StrTab.size()};
  67   for (const auto &KV : StrTab)
  68     Strings[KV.second] = KV.first();
  69   return Strings;
  70 }