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What function provides the encoding length? X86 in particular is so difficult to encode that only the old style JIT and the MC Code Emitter could possibly know how many bytes something takes. On Tue, Oct 23, 2012 at 11:58 AM, John Criswell <criswell at illinois.edu>wrote: > Dear All, > > I'm enhancing a MachineFunctionPass that enforces control-flow integrity. > One of the

...at cs.uiuc.edu> > http://llvm.cs.uiuc.edu > http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev > > > > > -- > ~Craig -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20121023/3c3db393/attachment.html>

Dear All, I'm enhancing a MachineFunctionPass that enforces control-flow integrity. One of the things I want to do is to set the alignment of an instruction (by adding NOPs before it in the MachineBasicBlock or by emitting an alignment directive to the assembler) if it causes a specific sequence of bytes to be generated at a specific alignment. The goal is to ensure that sequences of