| 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/AsmParser/Parser.h" |
| 14 | #include "llvm/IR/Module.h" |
| 15 | #include "llvm/IR/VFABIDemangler.h" |
| 16 | #include "llvm/Support/SourceMgr.h" |
| 17 | |
| 18 | using namespace llvm; |
| 19 | |
| 20 | extern "C"int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) { |
| 21 | LLVMContext Ctx; |
| 22 | SMDiagnostic Err; |
| 23 | const std::unique_ptr<Module> M = |
| 24 | parseAssemblyString(AsmString: "declare i32 @foo(i32 )\n", Err, Context&: Ctx); |
| 25 | const StringRef MangledName((const char *)Data, Size); |
| 26 | // Make sure that whatever symbol the demangler is operating on is |
| 27 | // present in the module (the signature is not important). This is |
| 28 | // because `tryDemangleForVFABI` fails if the function is not |
| 29 | // present. We need to make sure we can even invoke |
| 30 | // `getOrInsertFunction` because such method asserts on strings with |
| 31 | // zeroes. |
| 32 | // TODO: What is this actually testing? That we don't crash? |
| 33 | if (!MangledName.empty() && MangledName.find_first_of(C: 0) == StringRef::npos) { |
| 34 | FunctionType *FTy = |
| 35 | FunctionType::get(Result: Type::getVoidTy(C&: M->getContext()), isVarArg: false); |
| 36 | const auto Info = VFABI::tryDemangleForVFABI(MangledName, FTy); |
| 37 | |
| 38 | // Do not optimize away the return value. Inspired by |
| 39 | // https://github.com/google/benchmark/blob/main/include/benchmark/benchmark.h#L307-L345 |
| 40 | asm volatile("": : "r,m"(Info) : "memory"); |
| 41 | } |
| 42 | |
| 43 | return 0; |
| 44 | } |
| 45 |