LLVM  10.0.0svn
DebugStringTableSubsection.cpp
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1 //===- DebugStringTableSubsection.cpp - CodeView String Table -------------===//
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 
10 #include "llvm/ADT/StringRef.h"
14 #include "llvm/Support/Error.h"
15 #include <algorithm>
16 #include <cassert>
17 #include <cstdint>
18 
19 using namespace llvm;
20 using namespace llvm::codeview;
21 
24 
26  Stream = Contents;
27  return Error::success();
28 }
29 
31  return Reader.readStreamRef(Stream);
32 }
33 
36  BinaryStreamReader Reader(Stream);
37  Reader.setOffset(Offset);
38  StringRef Result;
39  if (auto EC = Reader.readCString(Result))
40  return std::move(EC);
41  return Result;
42 }
43 
46 
48  auto P = StringToId.insert({S, StringSize});
49 
50  // If a given string didn't exist in the string table, we want to increment
51  // the string table size and insert it into the reverse lookup.
52  if (P.second) {
53  IdToString.insert({P.first->getValue(), P.first->getKey()});
54  StringSize += S.size() + 1; // +1 for '\0'
55  }
56 
57  return P.first->second;
58 }
59 
61  return StringSize;
62 }
63 
65  uint32_t Begin = Writer.getOffset();
66  uint32_t End = Begin + StringSize;
67 
68  // Write a null string at the beginning.
69  if (auto EC = Writer.writeCString(StringRef()))
70  return EC;
71 
72  for (auto &Pair : StringToId) {
73  StringRef S = Pair.getKey();
74  uint32_t Offset = Begin + Pair.getValue();
75  Writer.setOffset(Offset);
76  if (auto EC = Writer.writeCString(S))
77  return EC;
78  assert(Writer.getOffset() <= End);
79  }
80 
81  Writer.setOffset(End);
82  assert((End - Begin) == StringSize);
83  return Error::success();
84 }
85 
86 uint32_t DebugStringTableSubsection::size() const { return StringToId.size(); }
87 
88 std::vector<uint32_t> DebugStringTableSubsection::sortedIds() const {
89  std::vector<uint32_t> Result;
90  Result.reserve(IdToString.size());
91  for (const auto &Entry : IdToString)
92  Result.push_back(Entry.first);
93  llvm::sort(Result);
94  return Result;
95 }
96 
98  auto Iter = StringToId.find(S);
99  assert(Iter != StringToId.end());
100  return Iter->second;
101 }
102 
104  auto Iter = IdToString.find(Id);
105  assert(Iter != IdToString.end());
106  return Iter->second;
107 }
This class represents lattice values for constants.
Definition: AllocatorList.h:23
iterator find(StringRef Key)
Definition: StringMap.h:355
Error commit(BinaryStreamWriter &Writer) const override
Expected< StringRef > getString(uint32_t Offset) const
unsigned size() const
Definition: StringMap.h:111
Tagged union holding either a T or a Error.
Definition: yaml2obj.h:21
Error readCString(StringRef &Dest)
Read a null terminated string from Dest.
LLVM_NODISCARD size_t size() const
size - Get the string size.
Definition: StringRef.h:144
#define P(N)
Provides write only access to a subclass of WritableBinaryStream.
void sort(IteratorTy Start, IteratorTy End)
Definition: STLExtras.h:1095
Error writeCString(StringRef Str)
Write the string Str to the underlying stream followed by a null terminator.
void setOffset(uint32_t Off)
static ErrorSuccess success()
Create a success value.
Definition: Error.h:326
BinaryStreamRef is to BinaryStream what ArrayRef is to an Array.
bool insert(MapEntryTy *KeyValue)
insert - Insert the specified key/value pair into the map.
Definition: StringMap.h:393
void setOffset(uint32_t Off)
Error readStreamRef(BinaryStreamRef &Ref)
Read the entire remainder of the underlying stream into Ref.
assert(ImpDefSCC.getReg()==AMDGPU::SCC &&ImpDefSCC.isDef())
Lightweight error class with error context and mandatory checking.
Definition: Error.h:157
Provides read only access to a subclass of BinaryStream.
StringRef - Represent a constant reference to a string, i.e.
Definition: StringRef.h:48
iterator end()
Definition: StringMap.h:340