DebugStringTableSubsection.h

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//===- DebugStringTableSubsection.h - CodeView String Table -----*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
 
#ifndef LLVM_DEBUGINFO_CODEVIEW_DEBUGSTRINGTABLESUBSECTION_H
#define LLVM_DEBUGINFO_CODEVIEW_DEBUGSTRINGTABLESUBSECTION_H
 
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/StringMap.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/DebugInfo/CodeView/CodeView.h"
#include "llvm/DebugInfo/CodeView/DebugSubsection.h"
#include "llvm/Support/BinaryStreamRef.h"
#include "llvm/Support/Compiler.h"
#include "llvm/Support/Error.h"
#include <cstdint>
 
namespace llvm {
 
class BinaryStreamReader;
 
namespace codeview {
 
/// Represents a read-only view of a CodeView string table.  This is a very
/// simple flat buffer consisting of null-terminated strings, where strings
/// are retrieved by their offset in the buffer.  DebugStringTableSubsectionRef
/// does not own the underlying storage for the buffer.
class DebugStringTableSubsectionRef : public DebugSubsectionRef {
public:
  LLVM_ABI DebugStringTableSubsectionRef();
 
  static bool classof(const DebugSubsectionRef *S) {
    return S->kind() == DebugSubsectionKind::StringTable;
  }
 
  LLVM_ABI Error initialize(BinaryStreamRef Contents);
  LLVM_ABI Error initialize(BinaryStreamReader &Reader);
 
  LLVM_ABI Expected<StringRef> getString(uint32_t Offset) const;
 
  bool valid() const { return Stream.valid(); }
 
  BinaryStreamRef getBuffer() const { return Stream; }
 
private:
  BinaryStreamRef Stream;
};
 
/// Represents a read-write view of a CodeView string table.
/// DebugStringTableSubsection owns the underlying storage for the table, and is
/// capable of serializing the string table into a format understood by
/// DebugStringTableSubsectionRef.
class LLVM_ABI DebugStringTableSubsection : public DebugSubsection {
public:
  DebugStringTableSubsection();
 
  static bool classof(const DebugSubsection *S) {
    return S->kind() == DebugSubsectionKind::StringTable;
  }
 
  // If string S does not exist in the string table, insert it.
  // Returns the ID for S.
  uint32_t insert(StringRef S);
 
  // Return the ID for string S.  Assumes S exists in the table.
  uint32_t getIdForString(StringRef S) const;
 
  StringRef getStringForId(uint32_t Id) const;
 
  uint32_t calculateSerializedSize() const override;
  Error commit(BinaryStreamWriter &Writer) const override;
 
  uint32_t size() const;
 
  StringMap<uint32_t>::const_iterator begin() const {
    return StringToId.begin();
  }
 
  StringMap<uint32_t>::const_iterator end() const { return StringToId.end(); }
 
  std::vector<uint32_t> sortedIds() const;
 
private:
  DenseMap<uint32_t, StringRef> IdToString;
  StringMap<uint32_t> StringToId;
  uint32_t StringSize = 1;
};
 
} // end namespace codeview
 
} // end namespace llvm
 
#endif // LLVM_DEBUGINFO_CODEVIEW_DEBUGSTRINGTABLESUBSECTION_H