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130 lines
4.4 KiB
C++
130 lines
4.4 KiB
C++
//===--- SourceManagerInternals.h - SourceManager Internals -----*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines the implementation details of the SourceManager
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// class.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CLANG_SOURCEMANAGER_INTERNALS_H
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#define LLVM_CLANG_SOURCEMANAGER_INTERNALS_H
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#include "clang/Basic/SourceManager.h"
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#include "llvm/ADT/StringMap.h"
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#include <map>
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namespace clang {
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//===----------------------------------------------------------------------===//
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// Line Table Implementation
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//===----------------------------------------------------------------------===//
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struct LineEntry {
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/// FileOffset - The offset in this file that the line entry occurs at.
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unsigned FileOffset;
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/// LineNo - The presumed line number of this line entry: #line 4.
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unsigned LineNo;
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/// FilenameID - The ID of the filename identified by this line entry:
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/// #line 4 "foo.c". This is -1 if not specified.
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int FilenameID;
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/// Flags - Set the 0 if no flags, 1 if a system header,
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SrcMgr::CharacteristicKind FileKind;
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/// IncludeOffset - This is the offset of the virtual include stack location,
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/// which is manipulated by GNU linemarker directives. If this is 0 then
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/// there is no virtual #includer.
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unsigned IncludeOffset;
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static LineEntry get(unsigned Offs, unsigned Line, int Filename,
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SrcMgr::CharacteristicKind FileKind,
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unsigned IncludeOffset) {
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LineEntry E;
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E.FileOffset = Offs;
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E.LineNo = Line;
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E.FilenameID = Filename;
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E.FileKind = FileKind;
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E.IncludeOffset = IncludeOffset;
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return E;
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}
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};
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// needed for FindNearestLineEntry (upper_bound of LineEntry)
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inline bool operator<(const LineEntry &lhs, const LineEntry &rhs) {
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// FIXME: should check the other field?
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return lhs.FileOffset < rhs.FileOffset;
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}
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inline bool operator<(const LineEntry &E, unsigned Offset) {
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return E.FileOffset < Offset;
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}
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inline bool operator<(unsigned Offset, const LineEntry &E) {
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return Offset < E.FileOffset;
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}
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/// LineTableInfo - This class is used to hold and unique data used to
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/// represent #line information.
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class LineTableInfo {
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/// FilenameIDs - This map is used to assign unique IDs to filenames in
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/// #line directives. This allows us to unique the filenames that
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/// frequently reoccur and reference them with indices. FilenameIDs holds
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/// the mapping from string -> ID, and FilenamesByID holds the mapping of ID
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/// to string.
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llvm::StringMap<unsigned, llvm::BumpPtrAllocator> FilenameIDs;
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std::vector<llvm::StringMapEntry<unsigned>*> FilenamesByID;
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/// LineEntries - This is a map from FileIDs to a list of line entries (sorted
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/// by the offset they occur in the file.
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std::map<unsigned, std::vector<LineEntry> > LineEntries;
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public:
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LineTableInfo() {
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}
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void clear() {
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FilenameIDs.clear();
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FilenamesByID.clear();
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LineEntries.clear();
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}
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~LineTableInfo() {}
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unsigned getLineTableFilenameID(const char *Ptr, unsigned Len);
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const char *getFilename(unsigned ID) const {
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assert(ID < FilenamesByID.size() && "Invalid FilenameID");
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return FilenamesByID[ID]->getKeyData();
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}
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unsigned getNumFilenames() const { return FilenamesByID.size(); }
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void AddLineNote(unsigned FID, unsigned Offset,
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unsigned LineNo, int FilenameID);
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void AddLineNote(unsigned FID, unsigned Offset,
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unsigned LineNo, int FilenameID,
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unsigned EntryExit, SrcMgr::CharacteristicKind FileKind);
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/// FindNearestLineEntry - Find the line entry nearest to FID that is before
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/// it. If there is no line entry before Offset in FID, return null.
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const LineEntry *FindNearestLineEntry(unsigned FID, unsigned Offset);
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// Low-level access
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typedef std::map<unsigned, std::vector<LineEntry> >::iterator iterator;
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iterator begin() { return LineEntries.begin(); }
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iterator end() { return LineEntries.end(); }
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/// \brief Add a new line entry that has already been encoded into
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/// the internal representation of the line table.
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void AddEntry(unsigned FID, const std::vector<LineEntry> &Entries);
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};
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} // end namespace clang
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#endif
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