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https://github.com/carbon-language/carbon-lang.git
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Jon Ross-PerkinsandRichard Smith
a93e621488
This adds vfs support to the toolchain, allowing Driver to take in-memory inputs in tests. As a consequence, I'm simplifying SourceBuffer: rather than allowing tests to pass in their own memory buffer, I'm using InMemoryFileSystem to push for greater consistency with production code. This does hit a quirk where I need to be careful about null terminator handling because fuzzer imports don't always have one, but that's probably more robust anyways. Co-authored-by: Richard Smith <richard@metafoo.co.uk>
47 lines
1.7 KiB
C++
47 lines
1.7 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 <cstddef>
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#include <cstdint>
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#include <cstring>
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#include "llvm/ADT/StringRef.h"
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#include "toolchain/diagnostics/diagnostic_emitter.h"
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#include "toolchain/diagnostics/null_diagnostics.h"
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#include "toolchain/lexer/tokenized_buffer.h"
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#include "toolchain/parser/parse_tree.h"
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namespace Carbon::Testing {
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// NOLINTNEXTLINE: Match the documented fuzzer entry point declaration style.
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extern "C" int LLVMFuzzerTestOneInput(const unsigned char* data,
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std::size_t size) {
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// Ignore large inputs.
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// TODO: See tokenized_buffer_fuzzer.cpp.
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if (size > 100000) {
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return 0;
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}
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static constexpr llvm::StringLiteral TestFileName = "test.carbon";
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llvm::vfs::InMemoryFileSystem fs;
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llvm::StringRef data_ref(reinterpret_cast<const char*>(data), size);
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CARBON_CHECK(fs.addFile(
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TestFileName, /*ModificationTime=*/0,
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llvm::MemoryBuffer::getMemBuffer(data_ref, /*BufferName=*/TestFileName,
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/*RequiresNullTerminator=*/false)));
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auto source = SourceBuffer::CreateFromFile(fs, TestFileName);
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// Lex the input.
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auto tokens = TokenizedBuffer::Lex(*source, NullDiagnosticConsumer());
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if (tokens.has_errors()) {
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return 0;
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}
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// Now parse it into a tree. Note that parsing will (when asserts are enabled)
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// walk the entire tree to verify it so we don't have to do that here.
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ParseTree::Parse(tokens, NullDiagnosticConsumer(), /*vlog_stream=*/nullptr);
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return 0;
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}
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} // namespace Carbon::Testing
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