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https://github.com/carbon-language/carbon-lang.git
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Jon Ross-Perkins
d12583fc08
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).
61 lines
2.2 KiB
C++
61 lines
2.2 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/error.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/interpreter/trace_stream.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 "tools/cpp/runfiles/runfiles.h"
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namespace Carbon {
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auto GetRunfilesFile(const std::string& file) -> 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 ParseAndExecute(const Fuzzing::Carbon& carbon) -> ErrorOr<int> {
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const std::string source = ProtoToCarbon(carbon, /*maybe_add_main=*/true);
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Arena arena;
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CARBON_ASSIGN_OR_RETURN(AST ast,
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ParseFromString(&arena, "Fuzzer.carbon", source,
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/*parser_debug=*/false));
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const ErrorOr<std::string> prelude_path =
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GetRunfilesFile("carbon/explorer/data/prelude.carbon");
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// Can't do anything without a prelude, so it's a fatal error.
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CARBON_CHECK(prelude_path.ok()) << prelude_path.error();
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AddPrelude(*prelude_path, &arena, &ast.declarations,
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&ast.num_prelude_declarations);
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TraceStream trace_stream;
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// Use llvm::nulls() to suppress output from the Print intrinsic.
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CARBON_ASSIGN_OR_RETURN(
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ast, AnalyzeProgram(&arena, ast, &trace_stream, &llvm::nulls()));
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return ExecProgram(&arena, ast, &trace_stream, &llvm::nulls());
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}
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} // namespace Carbon
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