mirror of
https://github.com/carbon-language/carbon-lang.git
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Richard Smith
eae630a3db
As discussed [on discord](https://discord.com/channels/655572317891461132/655578254970716160/1178878128714678282) and today's toolchain discussion.
60 lines
2.3 KiB
C++
60 lines
2.3 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 <cstring>
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#include "common/check.h"
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#include "llvm/ADT/StringRef.h"
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#include "toolchain/base/value_store.h"
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#include "toolchain/diagnostics/null_diagnostics.h"
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#include "toolchain/lex/lex.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: Investigate replacement with an error limit. Content with errors on
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// escaped quotes (`\"` repeated) have O(M * N) behavior for M errors in a
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// file length N, so either that will need to also be fixed or M will need to
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// shrink for large (1MB+) inputs.
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// This also affects parse/parse_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 =
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SourceBuffer::CreateFromFile(fs, TestFileName, NullDiagnosticConsumer());
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SharedValueStores value_stores;
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auto buffer = Lex::Lex(value_stores, *source, NullDiagnosticConsumer());
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if (buffer.has_errors()) {
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return 0;
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}
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// Walk the lexed and tokenized buffer to ensure it isn't corrupt in some way.
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//
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// TODO: We should enhance this to do more sanity checks on the resulting
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// token stream.
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for (Lex::TokenIndex token : buffer.tokens()) {
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int line_number = buffer.GetLineNumber(token);
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CARBON_CHECK(line_number > 0) << "Invalid line number!";
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CARBON_CHECK(line_number < INT_MAX) << "Invalid line number!";
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int column_number = buffer.GetColumnNumber(token);
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CARBON_CHECK(column_number > 0) << "Invalid line number!";
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CARBON_CHECK(column_number < INT_MAX) << "Invalid line number!";
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}
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return 0;
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}
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} // namespace Carbon::Testing
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