llvm/lib/FuzzMutate/FuzzerCLI.cpp

   1 //===-- FuzzerCLI.cpp -----------------------------------------------------===//
   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 #include "llvm/FuzzMutate/FuzzerCLI.h"
  10 #include "llvm/ADT/StringRef.h"
  11 #include "llvm/Support/CommandLine.h"
  12 #include "llvm/Support/MemoryBuffer.h"
  13 #include "llvm/Support/raw_ostream.h"
  14 #include "llvm/TargetParser/Triple.h"
  15
  16 using namespace llvm;
  17
  18 void llvm::parseFuzzerCLOpts(int ArgC, char *ArgV[]) {
  19   std::vector<const char *> CLArgs;
  20   CLArgs.push_back(ArgV[0]);
  21
  22   int I = 1;
  23   while (I < ArgC)
  24     if (StringRef(ArgV[I++]).equals("-ignore_remaining_args=1"))
  25       break;
  26   while (I < ArgC)
  27     CLArgs.push_back(ArgV[I++]);
  28
  29   cl::ParseCommandLineOptions(CLArgs.size(), CLArgs.data());
  30 }
  31
  32 void llvm::handleExecNameEncodedBEOpts(StringRef ExecName) {
  33   std::vector<std::string> Args{std::string(ExecName)};
  34
  35   auto NameAndArgs = ExecName.split("--");
  36   if (NameAndArgs.second.empty())
  37     return;
  38
  39   SmallVector<StringRef, 4> Opts;
  40   NameAndArgs.second.split(Opts, '-');
  41   for (StringRef Opt : Opts) {
  42     if (Opt.equals("gisel")) {
  43       Args.push_back("-global-isel");
  44       // For now we default GlobalISel to -O0
  45       Args.push_back("-O0");
  46     } else if (Opt.startswith("O")) {
  47       Args.push_back("-" + Opt.str());
  48     } else if (Triple(Opt).getArch()) {
  49       Args.push_back("-mtriple=" + Opt.str());
  50     } else {
  51       errs() << ExecName << ": Unknown option: " << Opt << ".\n";
  52       exit(1);
  53     }
  54   }
  55   errs() << NameAndArgs.first << ": Injected args:";
  56   for (int I = 1, E = Args.size(); I < E; ++I)
  57     errs() << " " << Args[I];
  58   errs() << "\n";
  59
  60   std::vector<const char *> CLArgs;
  61   CLArgs.reserve(Args.size());
  62   for (std::string &S : Args)
  63     CLArgs.push_back(S.c_str());
  64
  65   cl::ParseCommandLineOptions(CLArgs.size(), CLArgs.data());
  66 }
  67
  68 void llvm::handleExecNameEncodedOptimizerOpts(StringRef ExecName) {
  69   // TODO: Refactor parts common with the 'handleExecNameEncodedBEOpts'
  70   std::vector<std::string> Args{std::string(ExecName)};
  71
  72   auto NameAndArgs = ExecName.split("--");
  73   if (NameAndArgs.second.empty())
  74     return;
  75
  76   SmallVector<StringRef, 4> Opts;
  77   NameAndArgs.second.split(Opts, '-');
  78   for (StringRef Opt : Opts) {
  79     if (Opt == "instcombine") {
  80       Args.push_back("-passes=instcombine");
  81     } else if (Opt == "earlycse") {
  82       Args.push_back("-passes=early-cse");
  83     } else if (Opt == "simplifycfg") {
  84       Args.push_back("-passes=simplifycfg");
  85     } else if (Opt == "gvn") {
  86       Args.push_back("-passes=gvn");
  87     } else if (Opt == "sccp") {
  88       Args.push_back("-passes=sccp");
  89
  90     } else if (Opt == "loop_predication") {
  91       Args.push_back("-passes=loop-predication");
  92     } else if (Opt == "guard_widening") {
  93       Args.push_back("-passes=guard-widening");
  94     } else if (Opt == "loop_rotate") {
  95       Args.push_back("-passes=loop(rotate)");
  96     } else if (Opt == "loop_unswitch") {
  97       Args.push_back("-passes=loop(simple-loop-unswitch)");
  98     } else if (Opt == "loop_unroll") {
  99       Args.push_back("-passes=unroll");
 100     } else if (Opt == "loop_vectorize") {
 101       Args.push_back("-passes=loop-vectorize");
 102     } else if (Opt == "licm") {
 103       Args.push_back("-passes=licm");
 104     } else if (Opt == "indvars") {
 105       Args.push_back("-passes=indvars");
 106     } else if (Opt == "strength_reduce") {
 107       Args.push_back("-passes=loop-reduce");
 108     } else if (Opt == "irce") {
 109       Args.push_back("-passes=irce");
 110
 111     } else if (Triple(Opt).getArch()) {
 112       Args.push_back("-mtriple=" + Opt.str());
 113     } else {
 114       errs() << ExecName << ": Unknown option: " << Opt << ".\n";
 115       exit(1);
 116     }
 117   }
 118
 119   errs() << NameAndArgs.first << ": Injected args:";
 120   for (int I = 1, E = Args.size(); I < E; ++I)
 121     errs() << " " << Args[I];
 122   errs() << "\n";
 123
 124   std::vector<const char *> CLArgs;
 125   CLArgs.reserve(Args.size());
 126   for (std::string &S : Args)
 127     CLArgs.push_back(S.c_str());
 128
 129   cl::ParseCommandLineOptions(CLArgs.size(), CLArgs.data());
 130 }
 131
 132 int llvm::runFuzzerOnInputs(int ArgC, char *ArgV[], FuzzerTestFun TestOne,
 133                             FuzzerInitFun Init) {
 134   errs() << "*** This tool was not linked to libFuzzer.\n"
 135          << "*** No fuzzing will be performed.\n";
 136   if (int RC = Init(&ArgC, &ArgV)) {
 137     errs() << "Initialization failed\n";
 138     return RC;
 139   }
 140
 141   for (int I = 1; I < ArgC; ++I) {
 142     StringRef Arg(ArgV[I]);
 143     if (Arg.startswith("-")) {
 144       if (Arg.equals("-ignore_remaining_args=1"))
 145         break;
 146       continue;
 147     }
 148
 149     auto BufOrErr = MemoryBuffer::getFile(Arg, /*IsText=*/false,
 150                                           /*RequiresNullTerminator=*/false);
 151     if (std::error_code EC = BufOrErr.getError()) {
 152       errs() << "Error reading file: " << Arg << ": " << EC.message() << "\n";
 153       return 1;
 154     }
 155     std::unique_ptr<MemoryBuffer> Buf = std::move(BufOrErr.get());
 156     errs() << "Running: " << Arg << " (" << Buf->getBufferSize() << " bytes)\n";
 157     TestOne(reinterpret_cast<const uint8_t *>(Buf->getBufferStart()),
 158             Buf->getBufferSize());
 159   }
 160   return 0;
 161 }