mlir/tools/mlir-parser-fuzzer/bytecode/mlir-bytecode-parser-fuzzer.cpp

   1 //===--- mlir-bytecode-parser-fuzzer.cpp - Entry point to parser 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 // Implementation of main so we can build and test without linking libFuzzer.
  10 //
  11 //===----------------------------------------------------------------------===//
  12
  13 #include "mlir/IR/BuiltinOps.h"
  14 #include "mlir/IR/Diagnostics.h"
  15 #include "mlir/IR/MLIRContext.h"
  16 #include "mlir/Parser/Parser.h"
  17 #include "llvm/ADT/StringRef.h"
  18 #include "llvm/Support/Compiler.h"
  19
  20 using namespace mlir;
  21
  22 extern "C" LLVM_ATTRIBUTE_USED int LLVMFuzzerTestOneInput(const uint8_t *data,
  23                                                           size_t size) {
  24   // Skip empty inputs.
  25   if (size <= 1 || data[size - 1] != 0)
  26     return -1;
  27   llvm::StringRef str(reinterpret_cast<const char *>(data), size - 1);
  28   // Skip if not bytecode.
  29   if (!str.starts_with("ML\xefR"))
  30     return -1;
  31
  32   // Create a null-terminated memory buffer from the input.
  33   DialectRegistry registry;
  34   MLIRContext context(registry);
  35   context.allowUnregisteredDialects();
  36
  37   // Register diagnostic handler to avoid triggering exit behavior.
  38   context.getDiagEngine().registerHandler(
  39       [](mlir::Diagnostic &diag) { return; });
  40
  41   // Parse module. The parsed module isn't used, so it is discarded post parse
  42   // (successful or failure). The returned module is wrapped in a unique_ptr
  43   // such that it is freed upon exit if returned.
  44   (void)parseSourceString<ModuleOp>(str, &context);
  45   return 0;
  46 }
  47
  48 extern "C" LLVM_ATTRIBUTE_USED int llvmFuzzerInitialize(int *argc,
  49                                                         char ***argv) {
  50   return 0;
  51 }