1 //===- ArgumentsAdjusters.cpp - Command line arguments adjuster -----------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 // 9 // This file contains definitions of classes which implement ArgumentsAdjuster 10 // interface. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #include "clang/Tooling/ArgumentsAdjusters.h" 15 #include "clang/Basic/LLVM.h" 16 #include "llvm/ADT/STLExtras.h" 17 #include "llvm/ADT/StringRef.h" 18 #include <cstddef> 19 #include <vector> 20 21 namespace clang { 22 namespace tooling { 23 24 static StringRef getDriverMode(const CommandLineArguments &Args) { 25 for (const auto &Arg : Args) { 26 StringRef ArgRef = Arg; 27 if (ArgRef.consume_front("--driver-mode=")) { 28 return ArgRef; 29 } 30 } 31 return StringRef(); 32 } 33 34 /// Add -fsyntax-only option and drop options that triggers output generation. 35 ArgumentsAdjuster getClangSyntaxOnlyAdjuster() { 36 return [](const CommandLineArguments &Args, StringRef /*unused*/) { 37 CommandLineArguments AdjustedArgs; 38 bool HasSyntaxOnly = false; 39 constexpr llvm::StringRef OutputCommands[] = { 40 // FIXME: Add other options that generate output. 41 "-save-temps", 42 "--save-temps", 43 }; 44 for (size_t i = 0, e = Args.size(); i < e; ++i) { 45 StringRef Arg = Args[i]; 46 // Skip output commands. 47 if (llvm::any_of(OutputCommands, [&Arg](llvm::StringRef OutputCommand) { 48 return Arg.starts_with(OutputCommand); 49 })) 50 continue; 51 52 if (!Arg.starts_with("-fcolor-diagnostics") && 53 !Arg.starts_with("-fdiagnostics-color")) 54 AdjustedArgs.push_back(Args[i]); 55 // If we strip a color option, make sure we strip any preceeding `-Xclang` 56 // option as well. 57 // FIXME: This should be added to most argument adjusters! 58 else if (!AdjustedArgs.empty() && AdjustedArgs.back() == "-Xclang") 59 AdjustedArgs.pop_back(); 60 61 if (Arg == "-fsyntax-only") 62 HasSyntaxOnly = true; 63 } 64 if (!HasSyntaxOnly) 65 AdjustedArgs = 66 getInsertArgumentAdjuster("-fsyntax-only")(AdjustedArgs, ""); 67 return AdjustedArgs; 68 }; 69 } 70 71 ArgumentsAdjuster getClangStripOutputAdjuster() { 72 return [](const CommandLineArguments &Args, StringRef /*unused*/) { 73 CommandLineArguments AdjustedArgs; 74 for (size_t i = 0, e = Args.size(); i < e; ++i) { 75 StringRef Arg = Args[i]; 76 if (!Arg.starts_with("-o")) 77 AdjustedArgs.push_back(Args[i]); 78 79 if (Arg == "-o") { 80 // Output is specified as -o foo. Skip the next argument too. 81 ++i; 82 } 83 // Else, the output is specified as -ofoo. Just do nothing. 84 } 85 return AdjustedArgs; 86 }; 87 } 88 89 ArgumentsAdjuster getClangStripDependencyFileAdjuster() { 90 return [](const CommandLineArguments &Args, StringRef /*unused*/) { 91 auto UsingClDriver = (getDriverMode(Args) == "cl"); 92 93 CommandLineArguments AdjustedArgs; 94 for (size_t i = 0, e = Args.size(); i < e; ++i) { 95 StringRef Arg = Args[i]; 96 97 // These flags take an argument: -MX foo. Skip the next argument also. 98 if (!UsingClDriver && (Arg == "-MF" || Arg == "-MT" || Arg == "-MQ")) { 99 ++i; 100 continue; 101 } 102 // When not using the cl driver mode, dependency file generation options 103 // begin with -M. These include -MM, -MF, -MG, -MP, -MT, -MQ, -MD, and 104 // -MMD. 105 if (!UsingClDriver && Arg.starts_with("-M")) 106 continue; 107 // Under MSVC's cl driver mode, dependency file generation is controlled 108 // using /showIncludes 109 if (Arg.starts_with("/showIncludes") || Arg.starts_with("-showIncludes")) 110 continue; 111 112 AdjustedArgs.push_back(Args[i]); 113 } 114 return AdjustedArgs; 115 }; 116 } 117 118 ArgumentsAdjuster getInsertArgumentAdjuster(const CommandLineArguments &Extra, 119 ArgumentInsertPosition Pos) { 120 return [Extra, Pos](const CommandLineArguments &Args, StringRef /*unused*/) { 121 CommandLineArguments Return(Args); 122 123 CommandLineArguments::iterator I; 124 if (Pos == ArgumentInsertPosition::END) { 125 I = llvm::find(Return, "--"); 126 } else { 127 I = Return.begin(); 128 ++I; // To leave the program name in place 129 } 130 131 Return.insert(I, Extra.begin(), Extra.end()); 132 return Return; 133 }; 134 } 135 136 ArgumentsAdjuster getInsertArgumentAdjuster(const char *Extra, 137 ArgumentInsertPosition Pos) { 138 return getInsertArgumentAdjuster(CommandLineArguments(1, Extra), Pos); 139 } 140 141 ArgumentsAdjuster combineAdjusters(ArgumentsAdjuster First, 142 ArgumentsAdjuster Second) { 143 if (!First) 144 return Second; 145 if (!Second) 146 return First; 147 return [First, Second](const CommandLineArguments &Args, StringRef File) { 148 return Second(First(Args, File), File); 149 }; 150 } 151 152 ArgumentsAdjuster getStripPluginsAdjuster() { 153 return [](const CommandLineArguments &Args, StringRef /*unused*/) { 154 CommandLineArguments AdjustedArgs; 155 for (size_t I = 0, E = Args.size(); I != E; I++) { 156 // According to https://clang.llvm.org/docs/ClangPlugins.html 157 // plugin arguments are in the form: 158 // -Xclang {-load, -plugin, -plugin-arg-<plugin-name>, -add-plugin} 159 // -Xclang <arbitrary-argument> 160 if (I + 4 < E && Args[I] == "-Xclang" && 161 (Args[I + 1] == "-load" || Args[I + 1] == "-plugin" || 162 llvm::StringRef(Args[I + 1]).starts_with("-plugin-arg-") || 163 Args[I + 1] == "-add-plugin") && 164 Args[I + 2] == "-Xclang") { 165 I += 3; 166 continue; 167 } 168 AdjustedArgs.push_back(Args[I]); 169 } 170 return AdjustedArgs; 171 }; 172 } 173 174 } // end namespace tooling 175 } // end namespace clang 176