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//===--- ModuleDependencyCollector.cpp - Collect module dependencies ------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// Collect the dependencies of a set of modules.
//
//===----------------------------------------------------------------------===//
#include "clang/Frontend/Utils.h"
#include "clang/Serialization/ASTReader.h"
#include "llvm/ADT/iterator_range.h"
#include "llvm/ADT/StringSet.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/Path.h"
#include "llvm/Support/raw_ostream.h"
using namespace clang;
namespace {
/// Private implementation for ModuleDependencyCollector
class ModuleDependencyListener : public ASTReaderListener {
ModuleDependencyCollector &Collector;
std::error_code copyToRoot(StringRef Src);
public:
ModuleDependencyListener(ModuleDependencyCollector &Collector)
: Collector(Collector) {}
bool needsInputFileVisitation() override { return true; }
bool needsSystemInputFileVisitation() override { return true; }
bool visitInputFile(StringRef Filename, bool IsSystem,
bool IsOverridden) override;
};
}
void ModuleDependencyCollector::attachToASTReader(ASTReader &R) {
R.addListener(new ModuleDependencyListener(*this));
}
void ModuleDependencyCollector::writeFileMap() {
if (Seen.empty())
return;
SmallString<256> Dest = getDest();
llvm::sys::path::append(Dest, "vfs.yaml");
std::string ErrorInfo;
llvm::raw_fd_ostream OS(Dest.c_str(), ErrorInfo, llvm::sys::fs::F_Text);
if (!ErrorInfo.empty()) {
setHasErrors();
return;
}
VFSWriter.write(OS);
}
/// Remove traversal (ie, . or ..) from the given absolute path.
static void removePathTraversal(SmallVectorImpl<char> &Path) {
using namespace llvm::sys;
SmallVector<StringRef, 16> ComponentStack;
StringRef P(Path.data(), Path.size());
// Skip the root path, then look for traversal in the components.
StringRef Rel = path::relative_path(P);
for (StringRef C : llvm::make_range(path::begin(Rel), path::end(Rel))) {
if (C == ".")
continue;
if (C == "..") {
assert(ComponentStack.size() && "Path traverses out of parent");
ComponentStack.pop_back();
} else
ComponentStack.push_back(C);
}
// The stack is now the path without any directory traversal.
SmallString<256> Buffer = path::root_path(P);
for (StringRef C : ComponentStack)
path::append(Buffer, C);
// Put the result in Path.
Path.swap(Buffer);
}
std::error_code ModuleDependencyListener::copyToRoot(StringRef Src) {
using namespace llvm::sys;
// We need an absolute path to append to the root.
SmallString<256> AbsoluteSrc = Src;
fs::make_absolute(AbsoluteSrc);
removePathTraversal(AbsoluteSrc);
// Build the destination path.
SmallString<256> Dest = Collector.getDest();
path::append(Dest, path::relative_path(AbsoluteSrc));
// Copy the file into place.
if (std::error_code EC = fs::create_directories(path::parent_path(Dest),
/*IgnoreExisting=*/true))
return EC;
if (std::error_code EC = fs::copy_file(AbsoluteSrc.str(), Dest.str()))
return EC;
// Use the absolute path under the root for the file mapping.
Collector.addFileMapping(AbsoluteSrc.str(), Dest.str());
return std::error_code();
}
bool ModuleDependencyListener::visitInputFile(StringRef Filename, bool IsSystem,
bool IsOverridden) {
if (Collector.insertSeen(Filename))
if (copyToRoot(Filename))
Collector.setHasErrors();
return true;
}
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