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<div>Hi Vikram,</div>
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<div>I’m working on the Checked C project (<a href="https://www.microsoft.com/en-us/research/project/checked-c/" class="">https://www.microsoft.com/en-us/research/project/checked-c/</a>)</div>
<div>to enhance it with temporal memory safety. Fundamentally we want an (super) efficient way</div>
<div>(ideally with less than 5% performance overhead) of associating metadata with C pointers,</div>
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<div>and the reason we chose fat pointer is we believe this would be the most efficient way,</div>
<div>although at the cost of breaking the backward compatibility. I’ve done a literature survey and</div>
<div>found that most solutions (e.g., CETS, DANGNULL, FreeSentry, DangSan, etc) use
<b class="">disjoint data structures</b></div>
<div>to keep track of the point-to relations and maintaining the data structures is where all</div>
<div>the overhead (both performance and memory) comes from, and none of the existing solutions</div>
<div>are fast enough. I worked on this project last summer at Microsoft with David Tarditi, and</div>
<div>our conclusion is that fat pointer is the way to go if speed and memory consumption are more</div>
<div>critical issues than compatibility.</div>
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<div>Actually I’ve discussed this issue with John and we have received a small grant from Microsoft Research</div>
<div>with the "fat-pointer” design in the proposal (John is my advisor at Rochester :-)) . John talked</div>
<div>about implementing the fat pointer using an llvm vector or 128-bit integer, but we would still have</div>
<div>the type mismatch problem because in lots of places the compiler is expecting an llvm::PointerType.</div>
<div>I’ll discuss this more with John.</div>
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<div>Thanks,</div>
<div>- Jie</div>
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<div class="">On Jan 7, 2020, at 09:44, Adve, Vikram Sadanand via llvm-dev <<a href="mailto:llvm-dev@lists.llvm.org" class="">llvm-dev@lists.llvm.org</a>> wrote:</div>
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Jie,<o:p class=""></o:p></div>
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Do you actually want a fat-pointer specifically, or do you just want an efficient way to associate metadata with C pointers? Because (as I‘m sure you know) fat pointers have serious compatibility problems with external libraries, and also may break C programs
in other ways due to lack of sound type information.</div>
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John Criswell (copied) had created an improved version of Baggy Bounds which gives a efficient and compatible solution at low memory overhead. I suggest contacting him if you’re interested.<o:p class=""></o:p></div>
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<span style="" class="">—Vikram Adve<o:p class=""></o:p></span></div>
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<span style="" class="">+ Donald B. Gillies Professor of Computer Science, University of Illinois at Urbana-Champaign<o:p class=""></o:p></span></div>
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<span style="" class="">+ Admin: Kimberly Baker –<span class="Apple-converted-space"> </span></span><u class=""><span style="color: rgb(5, 99, 193);" class=""><a href="mailto:kabaker@illinois.edu" style="color: purple; text-decoration: underline;" class=""><span style="color: rgb(5, 99, 193);" class="">kabaker@illinois.edu</span></a></span></u><o:p class=""></o:p></div>
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<b class=""><span style="font-size: 12pt;" class="">From:<span class="Apple-converted-space"> </span></span></b><span style="font-size: 12pt;" class="">llvm-dev <<a href="mailto:llvm-dev-bounces@lists.llvm.org" style="color: purple; text-decoration: underline;" class="">llvm-dev-bounces@lists.llvm.org</a>>
on behalf of via llvm-dev <<a href="mailto:llvm-dev@lists.llvm.org" style="color: purple; text-decoration: underline;" class="">llvm-dev@lists.llvm.org</a>><br class="">
<b class="">Reply-To:<span class="Apple-converted-space"> </span></b>"<a href="mailto:llvm-dev@lists.llvm.org" style="color: purple; text-decoration: underline;" class="">llvm-dev@lists.llvm.org</a>" <<a href="mailto:llvm-dev@lists.llvm.org" style="color: purple; text-decoration: underline;" class="">llvm-dev@lists.llvm.org</a>>,
"<a href="mailto:llvm-dev-request@lists.llvm.org" style="color: purple; text-decoration: underline;" class="">llvm-dev-request@lists.llvm.org</a>" <<a href="mailto:llvm-dev-request@lists.llvm.org" style="color: purple; text-decoration: underline;" class="">llvm-dev-request@lists.llvm.org</a>><br class="">
<b class="">Date:<span class="Apple-converted-space"> </span></b>Tuesday, January 7, 2020 at 8:06 AM<br class="">
<b class="">To:<span class="Apple-converted-space"> </span></b>"<a href="mailto:llvm-dev@lists.llvm.org" style="color: purple; text-decoration: underline;" class="">llvm-dev@lists.llvm.org</a>" <<a href="mailto:llvm-dev@lists.llvm.org" style="color: purple; text-decoration: underline;" class="">llvm-dev@lists.llvm.org</a>><br class="">
<b class="">Subject:<span class="Apple-converted-space"> </span></b>llvm-dev Digest, Vol 187, Issue 17<o:p class=""></o:p></span></div>
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<span style="font-family: -webkit-standard, serif;" class="">Date: Tue, 7 Jan 2020 02:45:01 +0000<o:p class=""></o:p></span></div>
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<span style="font-family: -webkit-standard, serif;" class="">From: Jie Zhou via llvm-dev <<a href="mailto:llvm-dev@lists.llvm.org" style="color: purple; text-decoration: underline;" class="">llvm-dev@lists.llvm.org</a>><o:p class=""></o:p></span></div>
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<span style="font-family: -webkit-standard, serif;" class="">To: Eli Friedman via llvm-dev <<a href="mailto:llvm-dev@lists.llvm.org" style="color: purple; text-decoration: underline;" class="">llvm-dev@lists.llvm.org</a>><o:p class=""></o:p></span></div>
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<span style="font-family: -webkit-standard, serif;" class="">Subject: [llvm-dev] Best way of implement a fat pointer for C<o:p class=""></o:p></span></div>
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<span style="font-family: -webkit-standard, serif;" class="">Message-ID: <<a href="mailto:B6510CF7-CC75-4171-AF50-D6730EB068E8@cs.rochester.edu" style="color: purple; text-decoration: underline;" class="">B6510CF7-CC75-4171-AF50-D6730EB068E8@cs.rochester.edu</a>><o:p class=""></o:p></span></div>
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<span style="font-family: -webkit-standard, serif;" class="">Dear All,<o:p class=""></o:p></span></div>
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<span style="font-family: -webkit-standard, serif;" class="">I’m working on a project that extends C. I’m adding a new type of pointer<o:p class=""></o:p></span></div>
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<span style="font-family: -webkit-standard, serif;" class="">that is a fat pointer. It has some metadata about the pointed object besides<o:p class=""></o:p></span></div>
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<span style="font-family: -webkit-standard, serif;" class="">the starting address of the object. Currently I implemented this pointer as<o:p class=""></o:p></span></div>
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<span style="font-family: -webkit-standard, serif;" class="">an llvm:StructType. In llvm::Type generation function<o:p class=""></o:p></span></div>
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<span style="font-family: -webkit-standard, serif;" class="">llvm::Type *CodeGenTypes::ConvertType(QualType T)<o:p class=""></o:p></span></div>
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<span style="font-family: -webkit-standard, serif;" class="">in the case for clang::Type::Pointer, instead of creating an llvm::PointerType<o:p class=""></o:p></span></div>
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<span style="font-family: -webkit-standard, serif;" class="">I create an llvm::StructType type for this new type of pointer. And I added some<o:p class=""></o:p></span></div>
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<span style="font-family: -webkit-standard, serif;" class="">helper code in llvm::StructType and in multiple places I added code to trick<o:p class=""></o:p></span></div>
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<span style="font-family: -webkit-standard, serif;" class="">the compiler to believe sometimes a struct is actually a pointer. Until now<o:p class=""></o:p></span></div>
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<span style="font-family: -webkit-standard, serif;" class="">it compile test programs fine with -O0 but I got lots of assertion failures when<o:p class=""></o:p></span></div>
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<span style="font-family: -webkit-standard, serif;" class="">compiling with -O1 or -O2 majorly because of the confusion of type mismatch.<o:p class=""></o:p></span></div>
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<span style="font-family: -webkit-standard, serif;" class="">LLVM assumes that a PointerType is essentially an Integer (32 or 64 bit depending<o:p class=""></o:p></span></div>
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<span style="font-family: -webkit-standard, serif;" class="">on the architecture), and since this is quite a fundamental assumption, I started<o:p class=""></o:p></span></div>
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<span style="font-family: -webkit-standard, serif;" class="">to question whether my way of implementing the fat pointer is feasible.<o:p class=""></o:p></span></div>
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<span style="font-family: -webkit-standard, serif;" class="">I thought about adding a new llvm type that inherits both llvm:PointerType<o:p class=""></o:p></span></div>
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<span style="font-family: -webkit-standard, serif;" class="">and llvm:StructType; but I’m not sure if this is the correct path. It looks like<o:p class=""></o:p></span></div>
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<span style="font-family: -webkit-standard, serif;" class="">this demands substantial changes to the compiler including adding code<o:p class=""></o:p></span></div>
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<span style="font-family: -webkit-standard, serif;" class="">for bitcode generation. Can you give me some advice on how to implement<o:p class=""></o:p></span></div>
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<span style="font-family: -webkit-standard, serif;" class="">a fat pointer in llvm?<o:p class=""></o:p></span></div>
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<span style="font-family: -webkit-standard, serif;" class="">Thanks,<o:p class=""></o:p></span></div>
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<span style="font-family: -webkit-standard, serif;" class="">- Jie<o:p class=""></o:p></span></div>
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