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0fe1404812
verifyFunction/verifyModule don't assert or error internally. They also don't print anything if you don't pass a raw_ostream to them. So the caller needs to check the result and ideally pass a stream to get the messages. Otherwise they're just really expensive no-ops. I've filed PR45965 for another instance in SLPVectorizer that causes a lit test failure. Differential Revision: https://reviews.llvm.org/D80106
77 lines
2.4 KiB
C++
77 lines
2.4 KiB
C++
//===-- llvm-as-fuzzer.cpp - Fuzzer for llvm-as using lib/Fuzzer ----------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// Build tool to fuzz the LLVM assembler (llvm-as) using
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// lib/Fuzzer. The main reason for using this tool is that it is much
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// faster than using afl-fuzz, since it is run in-process.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/ADT/StringRef.h"
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#include "llvm/AsmParser/Parser.h"
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#include "llvm/IR/LLVMContext.h"
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#include "llvm/IR/Module.h"
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#include "llvm/IR/Verifier.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/MemoryBuffer.h"
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#include "llvm/Support/SourceMgr.h"
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#include "llvm/Support/raw_ostream.h"
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#include <csetjmp>
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using namespace llvm;
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static jmp_buf JmpBuf;
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namespace {
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void MyFatalErrorHandler(void *user_data, const std::string& reason,
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bool gen_crash_diag) {
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// Don't bother printing reason, just return to the test function,
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// since a fatal error represents a successful parse (i.e. it correctly
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// terminated with an error message to the user).
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longjmp(JmpBuf, 1);
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}
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static bool InstalledHandler = false;
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} // end of anonymous namespace
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extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
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// Allocate space for locals before setjmp so that memory can be collected
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// if parse exits prematurely (via longjmp).
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StringRef Input((const char *)Data, Size);
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// Note: We need to create a buffer to add a null terminator to the
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// end of the input string. The parser assumes that the string
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// parsed is always null terminated.
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std::unique_ptr<MemoryBuffer> MemBuf = MemoryBuffer::getMemBufferCopy(Input);
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SMDiagnostic Err;
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LLVMContext Context;
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std::unique_ptr<Module> M;
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if (setjmp(JmpBuf))
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// If reached, we have returned with non-zero status, so exit.
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return 0;
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// TODO(kschimpf) Write a main to do this initialization.
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if (!InstalledHandler) {
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llvm::install_fatal_error_handler(::MyFatalErrorHandler, nullptr);
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InstalledHandler = true;
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}
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M = parseAssembly(MemBuf->getMemBufferRef(), Err, Context);
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if (!M.get())
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return 0;
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if (verifyModule(*M.get(), &errs()))
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report_fatal_error("Broken module");
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return 0;
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}
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