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Frontend: Sink named pipe logic from CompilerInstance down to FileManager 

Remove compilicated logic from CompilerInstance::InitializeSourceManager
to deal with named pipes, updating FileManager::getBufferForFile to
handle it in a more straightforward way. The existing test at
clang/test/Misc/dev-fd-fs.c covers the new behaviour (just like it did
the old behaviour).

Differential Revision: https://reviews.llvm.org/D90733
This commit is contained in:
Duncan P. N. Exon Smith 2020-11-03 08:33:06 -05:00 committed by Duncan P. N. Exon Smith
parent dd2054d38a
commit 3b18a594c7
2 changed files with 3 additions and 25 deletions
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2
clang/lib/Basic/FileManager.cpp
View File

@ -489,7 +489,7 @@ FileManager::getBufferForFile(const FileEntry *Entry, bool isVolatile,
uint64_t FileSize = Entry->getSize();
// If there's a high enough chance that the file have changed since we
// got its size, force a stat before opening it.
if (isVolatile)
if (isVolatile || Entry->isNamedPipe())
FileSize = -1;
StringRef Filename = Entry->getName();

22
clang/lib/Frontend/CompilerInstance.cpp
View File

@ -858,30 +858,8 @@ bool CompilerInstance::InitializeSourceManager(const FrontendInputFile &Input,
}
FileEntryRef File = *FileOrErr;
// The natural SourceManager infrastructure can't currently handle named
// pipes, but we would at least like to accept them for the main
// file. Detect them here, read them with the volatile flag so FileMgr will
// pick up the correct size, and simply override their contents as we do for
// STDIN.
if (File.getFileEntry().isNamedPipe()) {
auto MB =
FileMgr.getBufferForFile(&File.getFileEntry(), /*isVolatile=*/true);
if (MB) {
// Create a new virtual file that will have the correct size.
const FileEntry *FE =
FileMgr.getVirtualFile(InputFile, (*MB)->getBufferSize(), 0);
SourceMgr.overrideFileContents(FE, std::move(*MB));
SourceMgr.setMainFileID(
SourceMgr.createFileID(FE, SourceLocation(), Kind));
} else {
Diags.Report(diag::err_cannot_open_file) << InputFile
<< MB.getError().message();
return false;
}
} else {
SourceMgr.setMainFileID(
SourceMgr.createFileID(File, SourceLocation(), Kind));
}
} else {
llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> SBOrErr =
llvm::MemoryBuffer::getSTDIN();