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to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
141 lines
4.3 KiB
C++
141 lines
4.3 KiB
C++
//===--- DependencyGraph.cpp - Generate dependency file -------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This code generates a header dependency graph in DOT format, for use
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// with, e.g., GraphViz.
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//
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//===----------------------------------------------------------------------===//
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#include "clang/Frontend/Utils.h"
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#include "clang/Basic/FileManager.h"
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#include "clang/Basic/SourceManager.h"
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#include "clang/Frontend/FrontendDiagnostic.h"
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#include "clang/Lex/PPCallbacks.h"
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#include "clang/Lex/Preprocessor.h"
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#include "llvm/ADT/SetVector.h"
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#include "llvm/Support/GraphWriter.h"
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#include "llvm/Support/raw_ostream.h"
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using namespace clang;
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namespace DOT = llvm::DOT;
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namespace {
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class DependencyGraphCallback : public PPCallbacks {
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const Preprocessor *PP;
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std::string OutputFile;
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std::string SysRoot;
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llvm::SetVector<const FileEntry *> AllFiles;
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typedef llvm::DenseMap<const FileEntry *,
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SmallVector<const FileEntry *, 2> > DependencyMap;
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DependencyMap Dependencies;
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private:
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raw_ostream &writeNodeReference(raw_ostream &OS,
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const FileEntry *Node);
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void OutputGraphFile();
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public:
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DependencyGraphCallback(const Preprocessor *_PP, StringRef OutputFile,
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StringRef SysRoot)
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: PP(_PP), OutputFile(OutputFile.str()), SysRoot(SysRoot.str()) { }
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void InclusionDirective(SourceLocation HashLoc, const Token &IncludeTok,
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StringRef FileName, bool IsAngled,
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CharSourceRange FilenameRange, const FileEntry *File,
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StringRef SearchPath, StringRef RelativePath,
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const Module *Imported,
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SrcMgr::CharacteristicKind FileType) override;
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void EndOfMainFile() override {
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OutputGraphFile();
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}
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};
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}
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void clang::AttachDependencyGraphGen(Preprocessor &PP, StringRef OutputFile,
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StringRef SysRoot) {
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PP.addPPCallbacks(llvm::make_unique<DependencyGraphCallback>(&PP, OutputFile,
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SysRoot));
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}
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void DependencyGraphCallback::InclusionDirective(
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SourceLocation HashLoc,
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const Token &IncludeTok,
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StringRef FileName,
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bool IsAngled,
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CharSourceRange FilenameRange,
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const FileEntry *File,
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StringRef SearchPath,
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StringRef RelativePath,
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const Module *Imported,
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SrcMgr::CharacteristicKind FileType) {
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if (!File)
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return;
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SourceManager &SM = PP->getSourceManager();
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const FileEntry *FromFile
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= SM.getFileEntryForID(SM.getFileID(SM.getExpansionLoc(HashLoc)));
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if (!FromFile)
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return;
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Dependencies[FromFile].push_back(File);
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AllFiles.insert(File);
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AllFiles.insert(FromFile);
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}
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raw_ostream &
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DependencyGraphCallback::writeNodeReference(raw_ostream &OS,
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const FileEntry *Node) {
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OS << "header_" << Node->getUID();
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return OS;
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}
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void DependencyGraphCallback::OutputGraphFile() {
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std::error_code EC;
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llvm::raw_fd_ostream OS(OutputFile, EC, llvm::sys::fs::F_Text);
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if (EC) {
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PP->getDiagnostics().Report(diag::err_fe_error_opening) << OutputFile
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<< EC.message();
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return;
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}
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OS << "digraph \"dependencies\" {\n";
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// Write the nodes
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for (unsigned I = 0, N = AllFiles.size(); I != N; ++I) {
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// Write the node itself.
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OS.indent(2);
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writeNodeReference(OS, AllFiles[I]);
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OS << " [ shape=\"box\", label=\"";
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StringRef FileName = AllFiles[I]->getName();
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if (FileName.startswith(SysRoot))
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FileName = FileName.substr(SysRoot.size());
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OS << DOT::EscapeString(FileName)
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<< "\"];\n";
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}
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// Write the edges
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for (DependencyMap::iterator F = Dependencies.begin(),
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FEnd = Dependencies.end();
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F != FEnd; ++F) {
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for (unsigned I = 0, N = F->second.size(); I != N; ++I) {
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OS.indent(2);
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writeNodeReference(OS, F->first);
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OS << " -> ";
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writeNodeReference(OS, F->second[I]);
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OS << ";\n";
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}
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}
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OS << "}\n";
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}
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