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Carbon fuzzing 3/3: added actual fuzzer implementation and a fuzzverter utility for investigating crashing protos (#1156)

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* finished fuzzer and added fuzzverter util

* fixed typo

* renamed cmd line params

* fixed libproto_mutator download path

* small fixes

* small fixes

* small fixes

* renamed sample corpus proto

* small fixes

* try building on github with LIBCPP_DEBUG enabled

* temporarily marked proto fuzzer as a manual test

* code review

* use a dedicated proto-fuzzer feature to work around LIBCPP_DEBUG=1 crash in proto code

* code review comments, added README.md

* minor fixes to the text

* Update bazel/cc_toolchains/clang_cc_toolchain_config.bzl

Co-authored-by: Jon Meow <jperkins@google.com>

* use Carbon source representation for "empty Main()" instead of text format proto representation

* fixed typo

* made FuzzerUtil produce the full carbon source (proto converted + Main if needed) to decrease code duplication a bit

* typo

* switched to text proto format per code review

* Update executable_semantics/prelude.h

Co-authored-by: Jon Meow <jperkins@google.com>

* Update executable_semantics/fuzzing/README.md

Co-authored-by: Jon Meow <jperkins@google.com>

* Update executable_semantics/fuzzing/README.md

Co-authored-by: Jon Meow <jperkins@google.com>

* Update executable_semantics/fuzzing/README.md

Co-authored-by: Jon Meow <jperkins@google.com>

* Update executable_semantics/fuzzing/README.md

Co-authored-by: Jon Meow <jperkins@google.com>

* Update executable_semantics/fuzzing/README.md

Co-authored-by: Jon Meow <jperkins@google.com>

* review comments

* removed unnecessary file mode variables

* Update executable_semantics/fuzzing/fuzzverter.cpp

Co-authored-by: Jon Meow <jperkins@google.com>

* Update executable_semantics/fuzzing/README.md

Co-authored-by: Jon Meow <jperkins@google.com>

* Update executable_semantics/fuzzing/README.md

Co-authored-by: Jon Meow <jperkins@google.com>

* code review comments

* Update executable_semantics/syntax/BUILD

Co-authored-by: Jon Meow <jperkins@google.com>

* buildifier

Co-authored-by: Jon Meow <jperkins@google.com>
This commit is contained in:
pk19604014
2022-04-11 16:47:03 -04:00
committed by GitHub
co-authored by Jon Meow
parent db0de1004f
commit 22462a0d7f
18 changed files with 497 additions and 20 deletions
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executable_semantics/fuzzing/fuzzer_util.cpp
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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 "executable_semantics/fuzzing/fuzzer_util.h"
#include "common/check.h"
#include "common/fuzzing/proto_to_carbon.h"
namespace Carbon {
// Appended to fuzzer-generated Carbon source when the source is missing
// `Main()` definition, to prevent early error return in semantic analysis.
static constexpr char EmptyMain[] = R"(
fn Main() -> i32 {
return 0;
}
)";
auto ProtoToCarbonWithMain(const Fuzzing::CompilationUnit& compilation_unit)
-> std::string {
const bool has_main = std::any_of(
compilation_unit.declarations().begin(),
compilation_unit.declarations().end(),
[](const Fuzzing::Declaration& decl) {
return decl.kind_case() == Fuzzing::Declaration::kFunction &&
decl.function().name() == "Main";
});
return Carbon::ProtoToCarbon(compilation_unit) + (has_main ? "" : EmptyMain);
}
} // namespace Carbon