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Frontend: add an option -bad-file-descriptor-retry-count

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This option allows the compiler to retry opening an input file if the previous
opening returns an error of bad file descriptor. Swift-driver will set this
argument in certain circumstances to walk-around such error.

rdar://73157185
This commit is contained in:
Xi Ge
2021-01-13 11:26:49 -08:00
parent 461b5246e6
commit ae9d873009
9 changed files with 80 additions and 11 deletions
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26
lib/Frontend/ArgsToFrontendInputsConverter.cpp
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@@ -34,7 +34,9 @@ ArgsToFrontendInputsConverter::ArgsToFrontendInputsConverter(
DiagnosticEngine &diags, const ArgList &args)
: Diags(diags), Args(args),
FilelistPathArg(args.getLastArg(options::OPT_filelist)),
PrimaryFilelistPathArg(args.getLastArg(options::OPT_primary_filelist)) {}
PrimaryFilelistPathArg(args.getLastArg(options::OPT_primary_filelist)),
BadFileDescriptorRetryCountArg(
args.getLastArg(options::OPT_bad_file_descriptor_retry_count)) {}
Optional<FrontendInputsAndOutputs> ArgsToFrontendInputsConverter::convert(
SmallVectorImpl<std::unique_ptr<llvm::MemoryBuffer>> *buffers) {
@@ -118,8 +120,26 @@ bool ArgsToFrontendInputsConverter::forAllFilesInFilelist(
if (!pathArg)
return false;
StringRef path = pathArg->getValue();
llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> filelistBufferOrError =
llvm::MemoryBuffer::getFile(path);
// Honor -bad-file-descriptor-retry-count from the argument list
unsigned RetryCount = 0;
if (BadFileDescriptorRetryCountArg &&
StringRef(BadFileDescriptorRetryCountArg->getValue())
.getAsInteger(10,RetryCount)) {
Diags.diagnose(SourceLoc(), diag::error_invalid_arg_value,
BadFileDescriptorRetryCountArg->getAsString(Args),
BadFileDescriptorRetryCountArg->getValue());
return true;
}
llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> filelistBufferOrError = nullptr;
for (unsigned I = 0; I < RetryCount + 1; ++I) {
filelistBufferOrError = llvm::MemoryBuffer::getFile(path);
if (filelistBufferOrError)
break;
if (filelistBufferOrError.getError().value() != EBADF)
break;
}
if (!filelistBufferOrError) {
Diags.diagnose(SourceLoc(), diag::cannot_open_file, path,
filelistBufferOrError.getError().message());