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Chandler Carruth
27386db279
The rationale and rule for this was added in #194 to the C++ style guide we are using for Carbon. I've applied the automated fixes from running `clang-tidy` over all the code, and then run `clang-format` afterward. There are a few places where `clang-format` fixed a formatting issue that snuck through in prior commits. These were rare enough that it didn't seem worth splitting them out into a separate change.
65 lines
2.0 KiB
C++
65 lines
2.0 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 <cstring>
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#include "diagnostics/diagnostic_emitter.h"
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#include "lexer/tokenized_buffer.h"
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#include "llvm/ADT/StringRef.h"
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#include "parser/parse_tree.h"
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namespace Carbon {
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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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// We need two bytes of data to compute a file name length.
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if (size < 2) {
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return 0;
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}
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unsigned short raw_filename_length;
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std::memcpy(&raw_filename_length, data, 2);
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data += 2;
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size -= 2;
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std::size_t filename_length = raw_filename_length;
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// We need enough data to populate this filename length.
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if (size < filename_length) {
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return 0;
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}
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llvm::StringRef filename(reinterpret_cast<const char*>(data),
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filename_length);
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data += filename_length;
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size -= filename_length;
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// The rest of the data is the source text.
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auto source = SourceBuffer::CreateFromText(
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llvm::StringRef(reinterpret_cast<const char*>(data), size), filename);
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// Use a real diagnostic emitter to get lazy codepaths to execute.
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DiagnosticEmitter emitter = NullDiagnosticEmitter();
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// Lex the input.
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auto tokens = TokenizedBuffer::Lex(source, emitter);
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if (tokens.HasErrors()) {
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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 tree = ParseTree::Parse(tokens, emitter);
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if (tree.HasErrors()) {
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return 0;
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}
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// In the absence of parse errors, we should have exactly as many nodes as
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// tokens.
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assert(tree.Size() == tokens.Size() && "Unexpected number of tree nodes!");
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return 0;
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}
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} // namespace Carbon
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