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//===--- HeaderIncludes.cpp - Generate Header Includes --------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "clang/Frontend/Utils.h"
#include "clang/Basic/SourceManager.h"
#include "clang/Lex/Preprocessor.h"
/*
#include "clang/Basic/Diagnostic.h"
#include "clang/Frontend/PreprocessorOutputOptions.h"
#include "clang/Lex/MacroInfo.h"
#include "clang/Lex/PPCallbacks.h"
#include "clang/Lex/Pragma.h"
#include "clang/Lex/TokenConcatenation.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/Config/config.h"
#include "llvm/Support/raw_ostream.h"
#include <cstdio>
*/
using namespace clang;
namespace {
class HeaderIncludesCallback : public PPCallbacks {
SourceManager &SM;
unsigned CurrentIncludeDepth;
bool HasProcessedPredefines;
public:
HeaderIncludesCallback(const Preprocessor *PP)
: SM(PP->getSourceManager()), CurrentIncludeDepth(0),
HasProcessedPredefines(false) {}
virtual void FileChanged(SourceLocation Loc, FileChangeReason Reason,
SrcMgr::CharacteristicKind FileType);
};
}
void clang::AttachHeaderIncludeGen(Preprocessor &PP) {
PP.addPPCallbacks(new HeaderIncludesCallback(&PP));
}
void HeaderIncludesCallback::FileChanged(SourceLocation Loc,
FileChangeReason Reason,
SrcMgr::CharacteristicKind NewFileType) {
// Unless we are exiting a #include, make sure to skip ahead to the line the
// #include directive was at.
PresumedLoc UserLoc = SM.getPresumedLoc(Loc);
if (UserLoc.isInvalid())
return;
// Adjust the current include depth.
if (Reason == PPCallbacks::EnterFile) {
++CurrentIncludeDepth;
} else {
if (CurrentIncludeDepth)
--CurrentIncludeDepth;
// We track when we are done with the predefines by watching for the first
// place where we drop back to a nesting depth of 0.
if (CurrentIncludeDepth == 0 && !HasProcessedPredefines)
HasProcessedPredefines = true;
}
// Dump the header include information we are past the predefines buffer.
if (HasProcessedPredefines && Reason == PPCallbacks::EnterFile) {
// Write to a temporary string to avoid unnecessary flushing on errs().
llvm::SmallString<512> Filename(UserLoc.getFilename());
Lexer::Stringify(Filename);
llvm::SmallString<256> Msg;
for (unsigned i = 0; i != CurrentIncludeDepth; ++i)
Msg += '.';
Msg += ' ';
Msg += Filename;
Msg += '\n';
llvm::errs() << Msg;
}
}
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