| 1 | //===-- DependencyInfo.h --------------------------------------------------===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | |
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| 9 | #include "llvm/ADT/StringRef.h" |
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| 10 | #include "llvm/Support/FileSystem.h" |
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| 11 | #include "llvm/Support/WithColor.h" |
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| 12 | #include "llvm/Support/raw_ostream.h" |
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| 13 | |
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| 14 | #include <set> |
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| 15 | |
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| 16 | class DependencyInfo { |
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| 17 | public: |
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| 18 | explicit DependencyInfo(std::string DependencyInfoPath) |
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| 19 | : DependencyInfoPath(DependencyInfoPath) {} |
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| 20 | |
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| 21 | virtual ~DependencyInfo(){}; |
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| 22 | |
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| 23 | virtual void addMissingInput(llvm::StringRef Path) { |
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| 24 | NotFounds.insert(x: Path.str()); |
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| 25 | } |
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| 26 | |
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| 27 | // Writes the dependencies to specified path. The content is first sorted by |
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| 28 | // OpCode and then by the filename (in alphabetical order). |
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| 29 | virtual void write(llvm::Twine Version, |
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| 30 | const std::vector<std::string> &Inputs, |
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| 31 | std::string Output) { |
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| 32 | std::error_code EC; |
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| 33 | llvm::raw_fd_ostream OS(DependencyInfoPath, EC, llvm::sys::fs::OF_None); |
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| 34 | if (EC) { |
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| 35 | llvm::WithColor::defaultErrorHandler(Err: llvm::createStringError( |
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| 36 | EC, |
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| 37 | S: "failed to write to " + DependencyInfoPath + ": " + EC.message())); |
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| 38 | return; |
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| 39 | } |
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| 40 | |
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| 41 | auto AddDep = [&OS](DependencyInfoOpcode Opcode, |
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| 42 | const llvm::StringRef &Path) { |
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| 43 | OS << static_cast<uint8_t>(Opcode); |
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| 44 | OS << Path; |
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| 45 | OS << '\0'; |
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| 46 | }; |
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| 47 | |
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| 48 | AddDep(DependencyInfoOpcode::Tool, Version.str()); |
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| 49 | |
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| 50 | // Sort the input by its names. |
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| 51 | std::vector<llvm::StringRef> InputNames; |
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| 52 | InputNames.reserve(n: Inputs.size()); |
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| 53 | for (const auto &F : Inputs) |
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| 54 | InputNames.push_back(x: F); |
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| 55 | llvm::sort(C&: InputNames); |
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| 56 | |
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| 57 | for (const auto &In : InputNames) |
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| 58 | AddDep(DependencyInfoOpcode::InputFound, In); |
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| 59 | |
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| 60 | for (const std::string &F : NotFounds) |
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| 61 | AddDep(DependencyInfoOpcode::InputMissing, F); |
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| 62 | |
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| 63 | AddDep(DependencyInfoOpcode::Output, Output); |
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| 64 | } |
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| 65 | |
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| 66 | private: |
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| 67 | enum DependencyInfoOpcode : uint8_t { |
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| 68 | Tool = 0x00, |
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| 69 | InputFound = 0x10, |
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| 70 | InputMissing = 0x11, |
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| 71 | Output = 0x40, |
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| 72 | }; |
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| 73 | |
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| 74 | const std::string DependencyInfoPath; |
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| 75 | std::set<std::string> NotFounds; |
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| 76 | }; |
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| 77 | |
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| 78 | // Subclass to avoid any overhead when not using this feature |
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| 79 | class DummyDependencyInfo : public DependencyInfo { |
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| 80 | public: |
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| 81 | DummyDependencyInfo() : DependencyInfo("" ) {} |
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| 82 | void addMissingInput(llvm::StringRef Path) override {} |
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| 83 | void write(llvm::Twine Version, const std::vector<std::string> &Inputs, |
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| 84 | std::string Output) override {} |
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| 85 | }; |
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| 86 | |
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