[PATCH] D16665: ELF: Do not treat errors in InputFiles class as fatal errors.

[Rui Ueyama via llvm-commits]

ruiu created this revision.
ruiu added a reviewer: rafael.
ruiu added a subscriber: llvm-commits.

This file is not as easy to handle errors as the driver or the
symbol table because of the nature of file IO. However, I think
this patch is not as horrible as I expected; I'm fairly satisfied
with this change. If we find an error, we call error() to record
the error, and return a zero value.  Zero value is an empty
vector for the vector, nullptr for a pointer, or an empty string
for the StringRef. Callers gracefully handle such values.

In some cases, we don't have good zero values. I changed the
type of such functions so that they return a boolean value.

All changes are mechanical and should not change the existing
behavior.

http://reviews.llvm.org/D16665

Files:
  ELF/Driver.cpp
  ELF/InputFiles.cpp
  ELF/InputFiles.h
  ELF/SymbolTable.cpp

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