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https://github.com/carbon-language/carbon-lang.git
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Jon Ross-Perkins
6c458ffe7e
As discussed around #3792, identify the import a diagnostic message came from prior to the diagnostic message itself. This occurs during location translation so that the logic can be central. I'd considered associating the parse node with ImportRef instructions, but I realized about halfway through that because I need to store the ImportDirectiveId on the ImportIR for cross-package imports, it's there for use in location translation without extra work. That saves a fair amount of stringing it through declarations, as well as an oddity where ImportRef instructions would have a node that didn't really represent them.
90 lines
3.2 KiB
C++
90 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 FilenameConverter : DiagnosticConverter<llvm::StringRef> {
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auto ConvertLocation(llvm::StringRef filename,
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ContextFnT /*context_fn*/) const
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-> DiagnosticLocation override {
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return {.filename = filename};
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}
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};
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} // namespace
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auto SourceBuffer::MakeFromStdin(DiagnosticConsumer& consumer)
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-> std::optional<SourceBuffer> {
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return MakeFromMemoryBuffer(llvm::MemoryBuffer::getSTDIN(), "<stdin>",
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/*is_regular_file=*/false, consumer);
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}
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auto SourceBuffer::MakeFromFile(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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FilenameConverter converter;
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DiagnosticEmitter<llvm::StringRef> emitter(converter, 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 MakeFromMemoryBuffer(
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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::MakeFromMemoryBuffer(
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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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FilenameConverter converter;
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DiagnosticEmitter<llvm::StringRef> emitter(converter, 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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