DWARFDeclContext.h

Go to the documentation of this file.

//===-- DWARFDeclContext.h --------------------------------------*- 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 LLDB_SOURCE_PLUGINS_SYMBOLFILE_DWARF_DWARFDECLCONTEXT_H
#define LLDB_SOURCE_PLUGINS_SYMBOLFILE_DWARF_DWARFDECLCONTEXT_H
 
#include <string>
#include <vector>
#include "lldb/Utility/ConstString.h"
#include "DWARFDefines.h"
 
// DWARFDeclContext
//
// A class that represents a declaration context all the way down to a
// DIE. This is useful when trying to find a DIE in one DWARF to a DIE
// in another DWARF file.
 
class DWARFDeclContext {
public:
  struct Entry {
    Entry() = default;
    Entry(dw_tag_t t, const char *n) : tag(t), name(n) {}
 
    bool NameMatches(const Entry &rhs) const {
      if (name == rhs.name)
        return true;
      else if (name && rhs.name)
        return strcmp(name, rhs.name) == 0;
      return false;
    }
 
    // Test operator
    explicit operator bool() const { return tag != 0; }
 
    dw_tag_t tag = llvm::dwarf::DW_TAG_null;
    const char *name = nullptr;
  };
 
  DWARFDeclContext() : m_entries() {}
 
  void AppendDeclContext(dw_tag_t tag, const char *name) {
    m_entries.push_back(Entry(tag, name));
  }
 
  bool operator==(const DWARFDeclContext &rhs) const;
  bool operator!=(const DWARFDeclContext &rhs) const { return !(*this == rhs); }
 
  uint32_t GetSize() const { return m_entries.size(); }
 
  Entry &operator[](uint32_t idx) {
    // "idx" must be valid
    return m_entries[idx];
  }
 
  const Entry &operator[](uint32_t idx) const {
    // "idx" must be valid
    return m_entries[idx];
  }
 
  const char *GetQualifiedName() const;
 
  // Same as GetQualifiedName, but the life time of the returned string will
  // be that of the LLDB session.
  lldb_private::ConstString GetQualifiedNameAsConstString() const {
    return lldb_private::ConstString(GetQualifiedName());
  }
 
  void Clear() {
    m_entries.clear();
    m_qualified_name.clear();
  }
 
protected:
  typedef std::vector<Entry> collection;
  collection m_entries;
  mutable std::string m_qualified_name;
};
 
#endif // LLDB_SOURCE_PLUGINS_SYMBOLFILE_DWARF_DWARFDECLCONTEXT_H