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//===--- DependencyFile.cpp - Generate dependency file --------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This code generates dependency files.
//
//===----------------------------------------------------------------------===//
#include "clang/Frontend/Utils.h"
#include "clang/Basic/FileManager.h"
#include "clang/Basic/SourceLocation.h"
#include "clang/Basic/SourceManager.h"
#include "clang/Frontend/DependencyOutputOptions.h"
#include "clang/Frontend/FrontendDiagnostic.h"
#include "clang/Lex/DirectoryLookup.h"
#include "clang/Lex/PPCallbacks.h"
#include "clang/Lex/Preprocessor.h"
#include "llvm/ADT/StringSet.h"
#include "llvm/Support/raw_ostream.h"
#include <string>
using namespace clang;
namespace {
class DependencyFileCallback : public PPCallbacks {
std::vector<std::string> Files;
llvm::StringSet<> FilesSet;
const Preprocessor *PP;
std::vector<std::string> Targets;
llvm::raw_ostream *OS;
bool IncludeSystemHeaders;
bool PhonyTarget;
private:
bool FileMatchesDepCriteria(const char *Filename,
SrcMgr::CharacteristicKind FileType);
void OutputDependencyFile();
public:
DependencyFileCallback(const Preprocessor *_PP,
llvm::raw_ostream *_OS,
const DependencyOutputOptions &Opts)
: PP(_PP), Targets(Opts.Targets), OS(_OS),
IncludeSystemHeaders(Opts.IncludeSystemHeaders),
PhonyTarget(Opts.UsePhonyTargets) {}
~DependencyFileCallback() {
OutputDependencyFile();
OS->flush();
delete OS;
}
virtual void FileChanged(SourceLocation Loc, FileChangeReason Reason,
SrcMgr::CharacteristicKind FileType);
};
}
void clang::AttachDependencyFileGen(Preprocessor &PP,
const DependencyOutputOptions &Opts) {
if (Opts.Targets.empty()) {
PP.getDiagnostics().Report(diag::err_fe_dependency_file_requires_MT);
return;
}
std::string Err;
llvm::raw_ostream *OS(new llvm::raw_fd_ostream(Opts.OutputFile.c_str(), Err));
if (!Err.empty()) {
PP.getDiagnostics().Report(diag::err_fe_error_opening)
<< Opts.OutputFile << Err;
return;
}
assert(!PP.getPPCallbacks() && "Preprocessor callbacks already registered!");
PP.setPPCallbacks(new DependencyFileCallback(&PP, OS, Opts));
}
/// FileMatchesDepCriteria - Determine whether the given Filename should be
/// considered as a dependency.
bool DependencyFileCallback::FileMatchesDepCriteria(const char *Filename,
SrcMgr::CharacteristicKind FileType) {
if (strcmp("<built-in>", Filename) == 0)
return false;
if (IncludeSystemHeaders)
return true;
return FileType == SrcMgr::C_User;
}
void DependencyFileCallback::FileChanged(SourceLocation Loc,
FileChangeReason Reason,
SrcMgr::CharacteristicKind FileType) {
if (Reason != PPCallbacks::EnterFile)
return;
// Dependency generation really does want to go all the way to the
// file entry for a source location to find out what is depended on.
// We do not want #line markers to affect dependency generation!
SourceManager &SM = PP->getSourceManager();
const FileEntry *FE =
SM.getFileEntryForID(SM.getFileID(SM.getInstantiationLoc(Loc)));
if (FE == 0) return;
const char *Filename = FE->getName();
if (!FileMatchesDepCriteria(Filename, FileType))
return;
// Remove leading "./"
if (Filename[0] == '.' && Filename[1] == '/')
Filename = &Filename[2];
if (FilesSet.insert(Filename))
Files.push_back(Filename);
}
void DependencyFileCallback::OutputDependencyFile() {
// Write out the dependency targets, trying to avoid overly long
// lines when possible. We try our best to emit exactly the same
// dependency file as GCC (4.2), assuming the included files are the
// same.
const unsigned MaxColumns = 75;
unsigned Columns = 0;
for (std::vector<std::string>::iterator
I = Targets.begin(), E = Targets.end(); I != E; ++I) {
unsigned N = I->length();
if (Columns == 0) {
Columns += N;
*OS << *I;
} else if (Columns + N + 2 > MaxColumns) {
Columns = N + 2;
*OS << " \\\n " << *I;
} else {
Columns += N + 1;
*OS << ' ' << *I;
}
}
*OS << ':';
Columns += 1;
// Now add each dependency in the order it was seen, but avoiding
// duplicates.
for (std::vector<std::string>::iterator I = Files.begin(),
E = Files.end(); I != E; ++I) {
// Start a new line if this would exceed the column limit. Make
// sure to leave space for a trailing " \" in case we need to
// break the line on the next iteration.
unsigned N = I->length();
if (Columns + (N + 1) + 2 > MaxColumns) {
*OS << " \\\n ";
Columns = 2;
}
*OS << ' ' << *I;
Columns += N + 1;
}
*OS << '\n';
// Create phony targets if requested.
if (PhonyTarget) {
// Skip the first entry, this is always the input file itself.
for (std::vector<std::string>::iterator I = Files.begin() + 1,
E = Files.end(); I != E; ++I) {
*OS << '\n';
*OS << *I << ":\n";
}
}
}
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