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-rw-r--r--clang/lib/Frontend/DependencyGraph.cpp140
1 files changed, 140 insertions, 0 deletions
diff --git a/clang/lib/Frontend/DependencyGraph.cpp b/clang/lib/Frontend/DependencyGraph.cpp
new file mode 100644
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+++ b/clang/lib/Frontend/DependencyGraph.cpp
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+//===--- DependencyGraph.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 a header dependency graph in DOT format, for use
+// with, e.g., GraphViz.
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/Frontend/Utils.h"
+#include "clang/Basic/FileManager.h"
+#include "clang/Basic/SourceManager.h"
+#include "clang/Frontend/FrontendDiagnostic.h"
+#include "clang/Lex/PPCallbacks.h"
+#include "clang/Lex/Preprocessor.h"
+#include "llvm/ADT/SetVector.h"
+#include "llvm/Support/raw_ostream.h"
+#include "llvm/Support/GraphWriter.h"
+
+using namespace clang;
+namespace DOT = llvm::DOT;
+
+namespace {
+class DependencyGraphCallback : public PPCallbacks {
+ const Preprocessor *PP;
+ std::string OutputFile;
+ std::string SysRoot;
+ llvm::SetVector<const FileEntry *> AllFiles;
+ typedef llvm::DenseMap<const FileEntry *,
+ llvm::SmallVector<const FileEntry *, 2> >
+ DependencyMap;
+
+ DependencyMap Dependencies;
+
+private:
+ llvm::raw_ostream &writeNodeReference(llvm::raw_ostream &OS,
+ const FileEntry *Node);
+ void OutputGraphFile();
+
+public:
+ DependencyGraphCallback(const Preprocessor *_PP, StringRef OutputFile,
+ StringRef SysRoot)
+ : PP(_PP), OutputFile(OutputFile.str()), SysRoot(SysRoot.str()) { }
+
+ virtual void InclusionDirective(SourceLocation HashLoc,
+ const Token &IncludeTok,
+ StringRef FileName,
+ bool IsAngled,
+ const FileEntry *File,
+ SourceLocation EndLoc,
+ StringRef SearchPath,
+ StringRef RelativePath);
+
+ virtual void EndOfMainFile() {
+ OutputGraphFile();
+ }
+
+};
+}
+
+void clang::AttachDependencyGraphGen(Preprocessor &PP, StringRef OutputFile,
+ StringRef SysRoot) {
+ PP.addPPCallbacks(new DependencyGraphCallback(&PP, OutputFile, SysRoot));
+}
+
+void DependencyGraphCallback::InclusionDirective(SourceLocation HashLoc,
+ const Token &IncludeTok,
+ StringRef FileName,
+ bool IsAngled,
+ const FileEntry *File,
+ SourceLocation EndLoc,
+ StringRef SearchPath,
+ StringRef RelativePath) {
+ if (!File)
+ return;
+
+ SourceManager &SM = PP->getSourceManager();
+ const FileEntry *FromFile
+ = SM.getFileEntryForID(SM.getFileID(SM.getExpansionLoc(HashLoc)));
+ if (FromFile == 0)
+ return;
+
+ Dependencies[FromFile].push_back(File);
+
+ AllFiles.insert(File);
+ AllFiles.insert(FromFile);
+}
+
+llvm::raw_ostream &
+DependencyGraphCallback::writeNodeReference(llvm::raw_ostream &OS,
+ const FileEntry *Node) {
+ OS << "header_" << Node->getUID();
+ return OS;
+}
+
+void DependencyGraphCallback::OutputGraphFile() {
+ std::string Err;
+ llvm::raw_fd_ostream OS(OutputFile.c_str(), Err);
+ if (!Err.empty()) {
+ PP->getDiagnostics().Report(diag::err_fe_error_opening)
+ << OutputFile << Err;
+ return;
+ }
+
+ OS << "digraph \"dependencies\" {\n";
+
+ // Write the nodes
+ for (unsigned I = 0, N = AllFiles.size(); I != N; ++I) {
+ // Write the node itself.
+ OS.indent(2);
+ writeNodeReference(OS, AllFiles[I]);
+ OS << " [ shape=\"box\", label=\"";
+ StringRef FileName = AllFiles[I]->getName();
+ if (FileName.startswith(SysRoot))
+ FileName = FileName.substr(SysRoot.size());
+
+ OS << DOT::EscapeString(FileName)
+ << "\"];\n";
+ }
+
+ // Write the edges
+ for (DependencyMap::iterator F = Dependencies.begin(),
+ FEnd = Dependencies.end();
+ F != FEnd; ++F) {
+ for (unsigned I = 0, N = F->second.size(); I != N; ++I) {
+ OS.indent(2);
+ writeNodeReference(OS, F->first);
+ OS << " -> ";
+ writeNodeReference(OS, F->second[I]);
+ OS << ";\n";
+ }
+ }
+ OS << "}\n";
+}
+