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//===-- FuzzerCLI.cpp -----------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "llvm/FuzzMutate/FuzzerCLI.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/ADT/Triple.h"
#include "llvm/Bitcode/BitcodeReader.h"
#include "llvm/Bitcode/BitcodeWriter.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Compiler.h"
#include "llvm/Support/Error.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/SourceMgr.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/IR/Verifier.h"
using namespace llvm;
void llvm::parseFuzzerCLOpts(int ArgC, char *ArgV[]) {
std::vector<const char *> CLArgs;
CLArgs.push_back(ArgV[0]);
int I = 1;
while (I < ArgC)
if (StringRef(ArgV[I++]).equals("-ignore_remaining_args=1"))
break;
while (I < ArgC)
CLArgs.push_back(ArgV[I++]);
cl::ParseCommandLineOptions(CLArgs.size(), CLArgs.data());
}
void llvm::handleExecNameEncodedBEOpts(StringRef ExecName) {
std::vector<std::string> Args{std::string(ExecName)};
auto NameAndArgs = ExecName.split("--");
if (NameAndArgs.second.empty())
return;
SmallVector<StringRef, 4> Opts;
NameAndArgs.second.split(Opts, '-');
for (StringRef Opt : Opts) {
if (Opt.equals("gisel")) {
Args.push_back("-global-isel");
// For now we default GlobalISel to -O0
Args.push_back("-O0");
} else if (Opt.startswith("O")) {
Args.push_back("-" + Opt.str());
} else if (Triple(Opt).getArch()) {
Args.push_back("-mtriple=" + Opt.str());
} else {
errs() << ExecName << ": Unknown option: " << Opt << ".\n";
exit(1);
}
}
errs() << NameAndArgs.first << ": Injected args:";
for (int I = 1, E = Args.size(); I < E; ++I)
errs() << " " << Args[I];
errs() << "\n";
std::vector<const char *> CLArgs;
CLArgs.reserve(Args.size());
for (std::string &S : Args)
CLArgs.push_back(S.c_str());
cl::ParseCommandLineOptions(CLArgs.size(), CLArgs.data());
}
void llvm::handleExecNameEncodedOptimizerOpts(StringRef ExecName) {
// TODO: Refactor parts common with the 'handleExecNameEncodedBEOpts'
std::vector<std::string> Args{std::string(ExecName)};
auto NameAndArgs = ExecName.split("--");
if (NameAndArgs.second.empty())
return;
SmallVector<StringRef, 4> Opts;
NameAndArgs.second.split(Opts, '-');
for (StringRef Opt : Opts) {
if (Opt == "instcombine") {
Args.push_back("-passes=instcombine");
} else if (Opt == "earlycse") {
Args.push_back("-passes=early-cse");
} else if (Opt == "simplifycfg") {
Args.push_back("-passes=simplifycfg");
} else if (Opt == "gvn") {
Args.push_back("-passes=gvn");
} else if (Opt == "sccp") {
Args.push_back("-passes=sccp");
} else if (Opt == "loop_predication") {
Args.push_back("-passes=loop-predication");
} else if (Opt == "guard_widening") {
Args.push_back("-passes=guard-widening");
} else if (Opt == "loop_rotate") {
Args.push_back("-passes=loop(rotate)");
} else if (Opt == "loop_unswitch") {
Args.push_back("-passes=loop(simple-loop-unswitch)");
} else if (Opt == "loop_unroll") {
Args.push_back("-passes=unroll");
} else if (Opt == "loop_vectorize") {
Args.push_back("-passes=loop-vectorize");
} else if (Opt == "licm") {
Args.push_back("-passes=licm");
} else if (Opt == "indvars") {
Args.push_back("-passes=indvars");
} else if (Opt == "strength_reduce") {
Args.push_back("-passes=loop-reduce");
} else if (Opt == "irce") {
Args.push_back("-passes=irce");
} else if (Triple(Opt).getArch()) {
Args.push_back("-mtriple=" + Opt.str());
} else {
errs() << ExecName << ": Unknown option: " << Opt << ".\n";
exit(1);
}
}
errs() << NameAndArgs.first << ": Injected args:";
for (int I = 1, E = Args.size(); I < E; ++I)
errs() << " " << Args[I];
errs() << "\n";
std::vector<const char *> CLArgs;
CLArgs.reserve(Args.size());
for (std::string &S : Args)
CLArgs.push_back(S.c_str());
cl::ParseCommandLineOptions(CLArgs.size(), CLArgs.data());
}
int llvm::runFuzzerOnInputs(int ArgC, char *ArgV[], FuzzerTestFun TestOne,
FuzzerInitFun Init) {
errs() << "*** This tool was not linked to libFuzzer.\n"
<< "*** No fuzzing will be performed.\n";
if (int RC = Init(&ArgC, &ArgV)) {
errs() << "Initialization failed\n";
return RC;
}
for (int I = 1; I < ArgC; ++I) {
StringRef Arg(ArgV[I]);
if (Arg.startswith("-")) {
if (Arg.equals("-ignore_remaining_args=1"))
break;
continue;
}
auto BufOrErr = MemoryBuffer::getFile(Arg, /*IsText=*/false,
/*RequiresNullTerminator=*/false);
if (std::error_code EC = BufOrErr.getError()) {
errs() << "Error reading file: " << Arg << ": " << EC.message() << "\n";
return 1;
}
std::unique_ptr<MemoryBuffer> Buf = std::move(BufOrErr.get());
errs() << "Running: " << Arg << " (" << Buf->getBufferSize() << " bytes)\n";
TestOne(reinterpret_cast<const uint8_t *>(Buf->getBufferStart()),
Buf->getBufferSize());
}
return 0;
}
std::unique_ptr<Module> llvm::parseModule(
const uint8_t *Data, size_t Size, LLVMContext &Context) {
if (Size <= 1)
// We get bogus data given an empty corpus - just create a new module.
return std::make_unique<Module>("M", Context);
auto Buffer = MemoryBuffer::getMemBuffer(
StringRef(reinterpret_cast<const char *>(Data), Size), "Fuzzer input",
/*RequiresNullTerminator=*/false);
SMDiagnostic Err;
auto M = parseBitcodeFile(Buffer->getMemBufferRef(), Context);
if (Error E = M.takeError()) {
errs() << toString(std::move(E)) << "\n";
return nullptr;
}
return std::move(M.get());
}
size_t llvm::writeModule(const Module &M, uint8_t *Dest, size_t MaxSize) {
std::string Buf;
{
raw_string_ostream OS(Buf);
WriteBitcodeToFile(M, OS);
}
if (Buf.size() > MaxSize)
return 0;
memcpy(Dest, Buf.data(), Buf.size());
return Buf.size();
}
std::unique_ptr<Module> llvm::parseAndVerify(const uint8_t *Data, size_t Size,
LLVMContext &Context) {
auto M = parseModule(Data, Size, Context);
if (!M || verifyModule(*M, &errs()))
return nullptr;
return M;
}
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