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carbon-lang/explorer/fuzzing/explorer_fuzzer.cpp
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Jon Ross-Perkins d12583fc08 Do cleanup on explorer fuzzing infrastructure. (#2790)
I'm partly doing this because the current setup would be difficult to share with the toolchain. e.g., ProtoToCarbon isn't explorer-specific, but the only way to run it via CLI is the explorer's fuzzverter. I want a separate tool.

This change:

- Adds a //common/fuzzing:proto_to_carbon tool.
  - The rest of fuzzverter is now just //explorer/fuzzing:ast_to_proto.
  - The change simplifies overall handling and removes a LLVM CLI dependency.
- Stops allowing unknown fields in the proto.
  - This has mostly led to forgetting to remove fuzzer inputs that were for removed features.
- Moves more non-explorer-specific bits to //common/fuzzing.
- Cleans up remaining pieces in //explorer/fuzzing
  - Merges the //explorer/fuzzing proto tests, which deduplicates AstToString copies.
    - These tests also had duplicate dependencies, etc -- and all complete in ~6s.
  - Updates and fixes regen_corpus which was previously broken by other changes.
  - Updates the README to reflect changes.
- Removes obsolete proto-fuzzer build configuration (AFAICT this is no longer needed).
2023-04-21 08:23:58 -07:00

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// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
// Exceptions. See /LICENSE for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
#include <libfuzzer/libfuzzer_macro.h>
#include "common/error.h"
#include "explorer/fuzzing/fuzzer_util.h"
#include "llvm/Support/raw_ostream.h"
DEFINE_TEXT_PROTO_FUZZER(const Carbon::Fuzzing::Carbon& input) {
// Only verifying it doesn't crash.
(void)Carbon::ParseAndExecute(input);
}