Stephen Hines | c568f1e | 2014-07-21 00:47:37 -0700 | [diff] [blame] | 1 | //===--- ModuleDependencyCollector.cpp - Collect module dependencies ------===// |
| 2 | // |
| 3 | // The LLVM Compiler Infrastructure |
| 4 | // |
| 5 | // This file is distributed under the University of Illinois Open Source |
| 6 | // License. See LICENSE.TXT for details. |
| 7 | // |
| 8 | //===----------------------------------------------------------------------===// |
| 9 | // |
| 10 | // Collect the dependencies of a set of modules. |
| 11 | // |
| 12 | //===----------------------------------------------------------------------===// |
| 13 | |
| 14 | #include "clang/Frontend/Utils.h" |
| 15 | #include "clang/Serialization/ASTReader.h" |
| 16 | #include "llvm/ADT/iterator_range.h" |
| 17 | #include "llvm/ADT/StringSet.h" |
| 18 | #include "llvm/Support/FileSystem.h" |
| 19 | #include "llvm/Support/Path.h" |
| 20 | #include "llvm/Support/raw_ostream.h" |
| 21 | |
| 22 | using namespace clang; |
| 23 | |
| 24 | namespace { |
| 25 | /// Private implementation for ModuleDependencyCollector |
| 26 | class ModuleDependencyListener : public ASTReaderListener { |
| 27 | ModuleDependencyCollector &Collector; |
| 28 | |
| 29 | std::error_code copyToRoot(StringRef Src); |
| 30 | public: |
| 31 | ModuleDependencyListener(ModuleDependencyCollector &Collector) |
| 32 | : Collector(Collector) {} |
| 33 | bool needsInputFileVisitation() override { return true; } |
| 34 | bool needsSystemInputFileVisitation() override { return true; } |
| 35 | bool visitInputFile(StringRef Filename, bool IsSystem, |
| 36 | bool IsOverridden) override; |
| 37 | }; |
| 38 | } |
| 39 | |
| 40 | void ModuleDependencyCollector::attachToASTReader(ASTReader &R) { |
Stephen Hines | 176edba | 2014-12-01 14:53:08 -0800 | [diff] [blame] | 41 | R.addListener(llvm::make_unique<ModuleDependencyListener>(*this)); |
Stephen Hines | c568f1e | 2014-07-21 00:47:37 -0700 | [diff] [blame] | 42 | } |
| 43 | |
| 44 | void ModuleDependencyCollector::writeFileMap() { |
| 45 | if (Seen.empty()) |
| 46 | return; |
| 47 | |
| 48 | SmallString<256> Dest = getDest(); |
| 49 | llvm::sys::path::append(Dest, "vfs.yaml"); |
| 50 | |
Stephen Hines | 176edba | 2014-12-01 14:53:08 -0800 | [diff] [blame] | 51 | std::error_code EC; |
| 52 | llvm::raw_fd_ostream OS(Dest, EC, llvm::sys::fs::F_Text); |
| 53 | if (EC) { |
Stephen Hines | c568f1e | 2014-07-21 00:47:37 -0700 | [diff] [blame] | 54 | setHasErrors(); |
| 55 | return; |
| 56 | } |
| 57 | VFSWriter.write(OS); |
| 58 | } |
| 59 | |
| 60 | /// Remove traversal (ie, . or ..) from the given absolute path. |
| 61 | static void removePathTraversal(SmallVectorImpl<char> &Path) { |
| 62 | using namespace llvm::sys; |
| 63 | SmallVector<StringRef, 16> ComponentStack; |
| 64 | StringRef P(Path.data(), Path.size()); |
| 65 | |
| 66 | // Skip the root path, then look for traversal in the components. |
| 67 | StringRef Rel = path::relative_path(P); |
| 68 | for (StringRef C : llvm::make_range(path::begin(Rel), path::end(Rel))) { |
| 69 | if (C == ".") |
| 70 | continue; |
| 71 | if (C == "..") { |
| 72 | assert(ComponentStack.size() && "Path traverses out of parent"); |
| 73 | ComponentStack.pop_back(); |
| 74 | } else |
| 75 | ComponentStack.push_back(C); |
| 76 | } |
| 77 | |
| 78 | // The stack is now the path without any directory traversal. |
| 79 | SmallString<256> Buffer = path::root_path(P); |
| 80 | for (StringRef C : ComponentStack) |
| 81 | path::append(Buffer, C); |
| 82 | |
| 83 | // Put the result in Path. |
| 84 | Path.swap(Buffer); |
| 85 | } |
| 86 | |
| 87 | std::error_code ModuleDependencyListener::copyToRoot(StringRef Src) { |
| 88 | using namespace llvm::sys; |
| 89 | |
| 90 | // We need an absolute path to append to the root. |
| 91 | SmallString<256> AbsoluteSrc = Src; |
| 92 | fs::make_absolute(AbsoluteSrc); |
| 93 | removePathTraversal(AbsoluteSrc); |
| 94 | |
| 95 | // Build the destination path. |
| 96 | SmallString<256> Dest = Collector.getDest(); |
| 97 | path::append(Dest, path::relative_path(AbsoluteSrc)); |
| 98 | |
| 99 | // Copy the file into place. |
| 100 | if (std::error_code EC = fs::create_directories(path::parent_path(Dest), |
| 101 | /*IgnoreExisting=*/true)) |
| 102 | return EC; |
| 103 | if (std::error_code EC = fs::copy_file(AbsoluteSrc.str(), Dest.str())) |
| 104 | return EC; |
| 105 | // Use the absolute path under the root for the file mapping. |
| 106 | Collector.addFileMapping(AbsoluteSrc.str(), Dest.str()); |
| 107 | return std::error_code(); |
| 108 | } |
| 109 | |
| 110 | bool ModuleDependencyListener::visitInputFile(StringRef Filename, bool IsSystem, |
| 111 | bool IsOverridden) { |
| 112 | if (Collector.insertSeen(Filename)) |
| 113 | if (copyToRoot(Filename)) |
| 114 | Collector.setHasErrors(); |
| 115 | return true; |
| 116 | } |