Eli Bendersky 6b731486d4 Add backreference matching capabilities to Support/Regex, with ... appropriate unit tests. This change in itself is not expected to affect any functionality at this point, but it will serve as a stepping stone to improve FileCheck's variable matching capabilities. Luckily, our regex implementation already supports backreferences, although a bit of hacking is required to enable it. It supports both Basic Regular Expressions (BREs) and Extended Regular Expressions (EREs), without supporting backrefs for EREs, following POSIX strictly in this respect. And EREs is what we actually use (rightly). This is contrary to many implementations (including the default on Linux) of POSIX regexes, that do allow backrefs in EREs. Adding backref support to our EREs is a very simple change in the regcomp parsing code. I fail to think of significant cases where it would clash with existing things, and can bring more versatility to the regexes we write. There's always the danger of a backref in a specially crafted regex causing exponential matching times, but since we mainly use them for testing purposes I don't think it's a big problem. [it can also be placed behind a flag specific to FileCheck, if needed]. For more details, see: * http://lists.cs.uiuc.edu/pipermail/llvmdev/2012-November/055840.html * http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20121126/156878.html git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@168802 91177308-0d34-0410-b5e6-96231b3b80d8		2012-11-28 19:00:02 +00:00
..
Analysis	Modified depends() to recognize that when all levels are "=" and	2012-11-27 19:12:26 +00:00
Archive	Mark checkSignature const, and in turn stop casting away const from	2012-09-05 22:09:23 +00:00
AsmParser	Add back support for reading and parsing 'deplibs'.	2012-11-28 08:41:48 +00:00
Bitcode	Add back support for reading and parsing 'deplibs'.	2012-11-28 08:41:48 +00:00
CodeGen	misched: Analysis that partitions the DAG into subtrees.	2012-11-28 05:13:28 +00:00
DebugInfo	The section is .debug_line.	2012-11-27 01:40:36 +00:00
ExecutionEngine	MCJIT depends on JIT.	2012-11-28 18:35:35 +00:00
Linker	Remove the dependent libraries feature.	2012-11-27 09:55:56 +00:00
MC	Add brief support for the fission .debug_info.dwo section for	2012-11-28 02:49:38 +00:00
Object	s/assert/llvm_unreachable/	2012-11-14 17:58:11 +00:00
Support	Add backreference matching capabilities to Support/Regex, with	2012-11-28 19:00:02 +00:00
TableGen	Remove exception handling usage from tblgen.	2012-10-25 20:33:17 +00:00
Target	Fix initial frame state on powerpc64.	2012-11-28 18:21:03 +00:00
Transforms	[asan] Split AddressSanitizer into two passes (FunctionPass, ModulePass), LLVM part. This requires a clang part which will follow.	2012-11-28 10:31:36 +00:00
VMCore	Fix warning. [-Wunused-variable]	2012-11-28 14:32:52 +00:00
CMakeLists.txt
LLVMBuild.txt
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