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pk19604014
ed93d95fce
This is to help with frequent build breakages cased by proto changes. Fuzzer corpus can be periodically auto-regenerated. Crashing samples from the fuzzer are better 'preserved' in the form of fail_xx.carbon tests.
96 lines
3.2 KiB
C++
96 lines
3.2 KiB
C++
// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
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// Exceptions. See /LICENSE for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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#include "explorer/fuzzing/fuzzer_util.h"
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#include <google/protobuf/text_format.h>
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#include "common/check.h"
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#include "common/fuzzing/proto_to_carbon.h"
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#include "explorer/interpreter/exec_program.h"
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#include "explorer/syntax/parse.h"
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#include "explorer/syntax/prelude.h"
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#include "llvm/Support/FileSystem.h"
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#include "llvm/Support/Path.h"
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#include "llvm/Support/raw_ostream.h"
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#include "tools/cpp/runfiles/runfiles.h"
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namespace Carbon {
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// Appended to fuzzer-generated Carbon source when the source is missing
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// `Main()` definition, to prevent early error return in semantic analysis.
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static constexpr char EmptyMain[] = R"(
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fn Main() -> i32 {
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return 0;
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}
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)";
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auto Internal::GetRunfilesFile(const std::string& file)
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-> ErrorOr<std::string> {
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using bazel::tools::cpp::runfiles::Runfiles;
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std::string error;
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// `Runfiles::Create()` fails if passed an empty `argv0`.
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std::unique_ptr<Runfiles> runfiles(Runfiles::Create(
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/*argv0=*/llvm::sys::fs::getMainExecutable(nullptr, nullptr), &error));
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if (runfiles == nullptr) {
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return Error(error);
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}
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std::string full_path = runfiles->Rlocation(file);
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if (!llvm::sys::fs::exists(full_path)) {
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return ErrorBuilder() << full_path << " doesn't exist";
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}
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return full_path;
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}
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auto ParseCarbonTextProto(const std::string& contents, bool allow_unknown)
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-> ErrorOr<Fuzzing::Carbon> {
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google::protobuf::TextFormat::Parser parser;
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if (allow_unknown) {
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parser.AllowUnknownField(true);
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parser.AllowUnknownExtension(true);
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}
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Fuzzing::Carbon carbon_proto;
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if (!parser.ParseFromString(contents, &carbon_proto)) {
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return ErrorBuilder() << "Couldn't parse Carbon text proto";
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}
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return carbon_proto;
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}
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auto ProtoToCarbonWithMain(const Fuzzing::CompilationUnit& compilation_unit)
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-> std::string {
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const bool has_main = std::any_of(
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compilation_unit.declarations().begin(),
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compilation_unit.declarations().end(),
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[](const Fuzzing::Declaration& decl) {
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return decl.kind_case() == Fuzzing::Declaration::kFunction &&
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decl.function().name() == "Main";
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});
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return Carbon::ProtoToCarbon(compilation_unit) + (has_main ? "" : EmptyMain);
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}
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void ParseAndExecute(const Fuzzing::CompilationUnit& compilation_unit) {
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const std::string source = ProtoToCarbonWithMain(compilation_unit);
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Arena arena;
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ErrorOr<AST> ast = ParseFromString(&arena, "Fuzzer.carbon", source,
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/*parser_debug=*/false);
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if (!ast.ok()) {
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llvm::errs() << "Parsing failed: " << ast.error().message() << "\n";
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return;
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}
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const ErrorOr<std::string> prelude_path =
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Internal::GetRunfilesFile("carbon/explorer/data/prelude.carbon");
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CARBON_CHECK(prelude_path.ok()) << prelude_path.error().message();
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AddPrelude(*prelude_path, &arena, &ast->declarations);
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const ErrorOr<int> result =
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ExecProgram(&arena, *ast, /*trace_stream=*/std::nullopt);
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if (!result.ok()) {
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llvm::errs() << "Execution failed: " << result.error().message() << "\n";
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return;
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}
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llvm::outs() << "Executed OK: " << *result << "\n";
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}
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} // namespace Carbon
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