You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
77 lines
2.4 KiB
77 lines
2.4 KiB
4 months ago
|
//===--- fuzz-llvm-as.cpp - Fuzzer for llvm-as using lib/Fuzzer -----------===//
|
||
|
|
//
|
||
|
|
// The LLVM Compiler Infrastructure
|
||
|
|
//
|
||
|
|
// This file is distributed under the University of Illinois Open Source
|
||
|
|
// License. See LICENSE.TXT for details.
|
||
|
|
//
|
||
|
|
//===----------------------------------------------------------------------===//
|
||
|
|
//
|
||
|
|
// Build tool to fuzz the LLVM assembler (llvm-as) using
|
||
|
|
// lib/Fuzzer. The main reason for using this tool is that it is much
|
||
|
|
// faster than using afl-fuzz, since it is run in-process.
|
||
|
|
//
|
||
|
|
//===----------------------------------------------------------------------===//
|
||
|
|
|
||
|
|
#include "llvm/ADT/StringRef.h"
|
||
|
|
#include "llvm/AsmParser/Parser.h"
|
||
|
|
#include "llvm/IR/LLVMContext.h"
|
||
|
|
#include "llvm/IR/Module.h"
|
||
|
|
#include "llvm/IR/Verifier.h"
|
||
|
|
#include "llvm/Support/ErrorHandling.h"
|
||
|
|
#include "llvm/Support/MemoryBuffer.h"
|
||
|
|
#include "llvm/Support/raw_ostream.h"
|
||
|
|
#include "llvm/Support/SourceMgr.h"
|
||
|
|
|
||
|
|
#include <csetjmp>
|
||
|
|
|
||
|
|
using namespace llvm;
|
||
|
|
|
||
|
|
static jmp_buf JmpBuf;
|
||
|
|
|
||
|
|
namespace {
|
||
|
|
|
||
|
|
void MyFatalErrorHandler(void *user_data, const std::string& reason,
|
||
|
|
bool gen_crash_diag) {
|
||
|
|
// Don't bother printing reason, just return to the test function,
|
||
|
|
// since a fatal error represents a successful parse (i.e. it correctly
|
||
|
|
// terminated with an error message to the user).
|
||
|
|
longjmp(JmpBuf, 1);
|
||
|
|
}
|
||
|
|
|
||
|
|
static bool InstalledHandler = false;
|
||
|
|
|
||
|
|
} // end of anonymous namespace
|
||
|
|
|
||
|
|
extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
|
||
|
|
|
||
|
|
// Allocate space for locals before setjmp so that memory can be collected
|
||
|
|
// if parse exits prematurely (via longjmp).
|
||
|
|
StringRef Input((const char *)Data, Size);
|
||
|
|
// Note: We need to create a buffer to add a null terminator to the
|
||
|
|
// end of the input string. The parser assumes that the string
|
||
|
|
// parsed is always null terminated.
|
||
|
|
std::unique_ptr<MemoryBuffer> MemBuf = MemoryBuffer::getMemBufferCopy(Input);
|
||
|
|
SMDiagnostic Err;
|
||
|
|
LLVMContext Context;
|
||
|
|
std::unique_ptr<Module> M;
|
||
|
|
|
||
|
|
if (setjmp(JmpBuf))
|
||
|
|
// If reached, we have returned with non-zero status, so exit.
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
// TODO(kschimpf) Write a main to do this initialization.
|
||
|
|
if (!InstalledHandler) {
|
||
|
|
llvm::install_fatal_error_handler(::MyFatalErrorHandler, nullptr);
|
||
|
|
InstalledHandler = true;
|
||
|
|
}
|
||
|
|
|
||
|
|
M = parseAssembly(MemBuf->getMemBufferRef(), Err, Context);
|
||
|
|
|
||
|
|
if (!M.get())
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
verifyModule(*M.get());
|
||
|
|
return 0;
|
||
|
|
}
|