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https://github.com/carbon-language/carbon-lang.git
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Chandler Carruth
954441c358
This teaches the driver library to track when its being used with fuzzing and disables the `clang` subcommand from actually running Clang. The Clang libraries have a large backlog of fuzzer-found issues that isn't being actively reduced, so we can't productively fuzz into it. This lets us more productively fuzz at the top level. This is also available on the command line itself, which should be useful if anyone wants to fuzz Carbon from the command line using tools like AFL -- they can inject this flag to avoid getting noise from the fuzzer hitting known issues in Clang.
60 lines
1.9 KiB
C++
60 lines
1.9 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 "toolchain/driver/clang_subcommand.h"
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#include "llvm/TargetParser/Host.h"
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#include "toolchain/driver/clang_runner.h"
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namespace Carbon {
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constexpr CommandLine::CommandInfo ClangOptions::Info = {
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.name = "clang",
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.help = R"""(
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Runs Clang on arguments.
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This is equivalent to running the `clang` command line directly, and provides
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the full command line interface.
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Use `carbon clang -- ARGS` to pass flags to `clang`. Although there are
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currently no flags for `carbon clang`, the `--` reserves the ability to add
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flags in the future.
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This is provided to help guarantee consistent compilation of C++ files, both
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when Clang is invoked directly and when a Carbon file importing a C++ file
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results in an indirect Clang invocation.
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)""",
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};
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auto ClangOptions::Build(CommandLine::CommandBuilder& b) -> void {
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b.AddStringPositionalArg(
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{
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.name = "ARG",
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.help = R"""(
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Arguments passed to Clang.
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)""",
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},
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[&](auto& arg_b) { arg_b.Append(&args); });
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}
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// TODO: This lacks a lot of features from the main driver code. We may need to
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// add more.
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// https://github.com/llvm/llvm-project/blob/main/clang/tools/driver/driver.cpp
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auto ClangSubcommand::Run(DriverEnv& driver_env) -> DriverResult {
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std::string target = llvm::sys::getDefaultTargetTriple();
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ClangRunner runner(driver_env.installation, target, driver_env.vlog_stream);
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// Don't run Clang when fuzzing, it is known to not be reliable under fuzzing
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// due to many unfixed issues.
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if (driver_env.fuzzing) {
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driver_env.error_stream
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<< "error: cannot run `clang` subcommand productively when fuzzing\n";
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return {.success = false};
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}
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return {.success = runner.Run(options_.args)};
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}
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} // namespace Carbon
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