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https://github.com/carbon-language/carbon-lang.git
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Richard SmithandChandler Carruth
9154c6410e
- Treat an input of `-` as meaning stdin. - Fix building of an llvm::MemoryBuffer from a non-regular file. - Do not enforce filename restrictions on non-regular files. - Do not invent an output file name based on the name of a non-regular file. --------- Co-authored-by: Chandler Carruth <chandlerc@gmail.com>
88 lines
3.2 KiB
C++
88 lines
3.2 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 "toolchain/source/source_buffer.h"
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#include <limits>
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#include "llvm/Support/ErrorOr.h"
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namespace Carbon {
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namespace {
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struct FilenameTranslator : DiagnosticLocationTranslator<llvm::StringRef> {
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auto GetLocation(llvm::StringRef filename) -> DiagnosticLocation override {
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return {.file_name = filename};
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}
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};
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} // namespace
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auto SourceBuffer::CreateFromStdin(DiagnosticConsumer& consumer)
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-> std::optional<SourceBuffer> {
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return CreateFromMemoryBuffer(llvm::MemoryBuffer::getSTDIN(), "<stdin>",
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/*is_regular_file=*/false, consumer);
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}
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auto SourceBuffer::CreateFromFile(llvm::vfs::FileSystem& fs,
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llvm::StringRef filename,
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DiagnosticConsumer& consumer)
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-> std::optional<SourceBuffer> {
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FilenameTranslator translator;
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DiagnosticEmitter<llvm::StringRef> emitter(translator, consumer);
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llvm::ErrorOr<std::unique_ptr<llvm::vfs::File>> file =
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fs.openFileForRead(filename);
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if (file.getError()) {
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CARBON_DIAGNOSTIC(ErrorOpeningFile, Error,
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"Error opening file for read: {0}", std::string);
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emitter.Emit(filename, ErrorOpeningFile, file.getError().message());
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return std::nullopt;
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}
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llvm::ErrorOr<llvm::vfs::Status> status = (*file)->status();
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if (status.getError()) {
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CARBON_DIAGNOSTIC(ErrorStattingFile, Error, "Error statting file: {0}",
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std::string);
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emitter.Emit(filename, ErrorStattingFile, file.getError().message());
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return std::nullopt;
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}
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// `stat` on a file without a known size gives a size of 0, which causes
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// `llvm::vfs::File::getBuffer` to produce an empty buffer. Use a size of -1
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// in this case so we get the complete file contents.
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bool is_regular_file = status->isRegularFile();
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int64_t size = is_regular_file ? status->getSize() : -1;
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return CreateFromMemoryBuffer(
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(*file)->getBuffer(filename, size, /*RequiresNullTerminator=*/false),
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filename, is_regular_file, consumer);
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}
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auto SourceBuffer::CreateFromMemoryBuffer(
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llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> buffer,
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llvm::StringRef filename, bool is_regular_file,
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DiagnosticConsumer& consumer) -> std::optional<SourceBuffer> {
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FilenameTranslator translator;
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DiagnosticEmitter<llvm::StringRef> emitter(translator, consumer);
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if (buffer.getError()) {
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CARBON_DIAGNOSTIC(ErrorReadingFile, Error, "Error reading file: {0}",
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std::string);
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emitter.Emit(filename, ErrorReadingFile, buffer.getError().message());
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return std::nullopt;
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}
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if (buffer.get()->getBufferSize() >= std::numeric_limits<int32_t>::max()) {
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CARBON_DIAGNOSTIC(FileTooLarge, Error,
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"File is over the 2GiB input limit; size is {0} bytes.",
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int64_t);
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emitter.Emit(filename, FileTooLarge, buffer.get()->getBufferSize());
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return std::nullopt;
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}
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return SourceBuffer(filename.str(), std::move(buffer.get()), is_regular_file);
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}
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} // namespace Carbon
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