1 //===-- vfabi-demangler-fuzzer.cpp - Fuzzer VFABI using lib/Fuzzer ------===// 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 // Build tool to fuzz the demangler for the vector function ABI names. 10 // 11 //===----------------------------------------------------------------------===// 12 13 #include "llvm/Analysis/VectorUtils.h" 14 #include "llvm/AsmParser/Parser.h" 15 16 using namespace llvm; 17 18 extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) { 19 LLVMContext Ctx; 20 SMDiagnostic Err; 21 const std::unique_ptr<Module> M = 22 parseAssemblyString("declare i32 @foo(i32 )\n", Err, Ctx); 23 const StringRef MangledName((const char *)Data, Size); 24 // Make sure that whatever symbol the demangler is operating on is 25 // present in the module (the signature is not important). This is 26 // because `tryDemangleForVFABI` fails if the function is not 27 // present. We need to make sure we can even invoke 28 // `getOrInsertFunction` because such method asserts on strings with 29 // zeroes. 30 if (!MangledName.empty() && MangledName.find_first_of(0) == StringRef::npos) 31 M->getOrInsertFunction( 32 MangledName, 33 FunctionType::get(Type::getVoidTy(M->getContext()), false)); 34 const auto Info = VFABI::tryDemangleForVFABI(MangledName, *M); 35 36 // Do not optimize away the return value. Inspired by 37 // https://github.com/google/benchmark/blob/master/include/benchmark/benchmark.h#L307-L345 38 asm volatile("" : : "r,m"(Info) : "memory"); 39 40 return 0; 41 } 42
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