similar to: [LLVMdev] Hello World

2010/6/24 Félix Cloutier <felixcca at yahoo.ca>: > Hello everyone, > > I've been watching LLVM since about a year now, and I thought it was finally time I'd do something with it. So I've got my hands dirty with a cool project (who knows? maybe I'll end up releasing it), but since I'm fairly new to the whole thing, there are still a number of things I'm not

Felix, It really depends on what you are doing with the JIT. In my case, I have a scripting language that has a limited set of base data types. I wanted to be able to trivially interface to new C++ methods and classes, so I'm interfacing to C++ classes by creating external definitions much like the way Kaleidoscope accesses external C functions. I only have to deal with a few types so I can

Hello everyone, I've been watching LLVM since about a year now, and I thought it was finally time I'd do something with it. So I've got my hands dirty with a cool project (who knows? maybe I'll end up releasing it), but since I'm fairly new to the whole thing, there are still a number of things I'm not too sure about. First, the way we create instructions confuses me a

The semantics of C++ depend heavily on what comes before the given fragment. How do you plan to address this? For example, if you know all the headers you think these snippets will include, you can do something similar to PCH to parse the fragment in context of all of the headers. I don't know much about feeding clang buffers instead of files, but I believe it can be done with some of the

I'm assuming you're looking at this document? http://llvm.org/docs/DebuggingJITedCode.html That document should probably be updated to say you need GDB 7.0 or newer, since that's when the feature was released. Most Linux distributions have picked this up, so it should Just Work on Linux. Apple's GDB is stale (6.3 + lots of patches). They've stopped updating the version of

So I got very mixed results. With the CallGraphSCCPass, both `addRequired<DominatorTreeWrapperPass>` and `addRequired<MemoryDependenceAnalysis>` fail at runtime. The LLVM core has just two CallGraphSCCPasses and neither uses neither analyses, so it's hard to find a valid example. I transformed the pass into a ModulePass, using scc_iterator as shown in CGPassManager to process

Thanks Daniel, I'll do a debug build of LLVM (I guess that'll teach me) and step through it as soon as I'll find a power outlet. I'm calling getDependency on the load instruction, and it returns the store instruction. Suspiciously enough, calling invalidateCachedPointerInfo on load->getPointerOperand() does not cause my AA pass to be called again when I use getDependency (or

Probably not well. But it depends on the application, and probably the loader. Some applications (OpenCL comes to mind) have the bitcode ready to go as soon as they start. The only reason they use the JIT is because they want to compile the code to run fast on the available hardware. It really depends on how often the application wants to generate code, which for some people may not be that

Hello Félix- Consider the following snippet of IR: define i32 @foo(i32 %n) nounwind { entry: br label %loop loop: %loop.n = phi i32 [0, %entry], [%tmp, %loop] call void @bar() nounwind %tmp = sub nsw i32 %loop.n, 1 %cmp = icmp eq i32 %tmp, 0 br i1 %cmp, label %exit, label %loop exit: ret i32 0 } declare void @bar() nounwind Try to merge the blocks "entry" and "loop"

It's past 3 AM here, so maybe I really shouldn't be answering in this state of awakeness. However, what I understand from your example is that loops with counters must be entered from another block in order to use the phi instruction correctly, not that it should be invalid to branch to the entry block. It seems to me that it makes sense to go back to the entry point if looping is not

Hi Félix, Sanjoy Das wrote: > Félix Cloutier via llvm-dev wrote: > > Assuming that this is a bug, what are the next steps? > > Looks like you already have a very small test case -- have you tried > sticking it in a debugger to see why SCCP thinks removing the call is > okay? > > Alternatively, file a bug at llvm.org/bugs and someone will get to it. The third

On Feb 28, 2011, at 8:07 PM, Félix Cloutier wrote: > I'm using Xcode 3 to program with LLVM and Clang (both about yesterday's latest revisions), and when I compile, I get 1501 link-time warnings. All those I read were about symbol visibility. Here's an example: > > ld: warning: namespace::class::method() has different visibility (default) in

Hey guys, I'd need to debug just-in-time compiled code under Mac OS. As predicted, GDB doesn't cope really well with it. The LLVM manual seems to say it's possible to patch GDB under Linux, but there seems to be no option for Mac OS. What can I do? I'd prefer a solution that integrates with Xcode, but I'll manage if it doesn't and I have to run the debugger externally.

Thanks John. Does this solve the problem of analysis availability though? If I still have to run the function analyses manually, I might as well keep rolling with the CallGraphSCCPass. (I probably should have mentioned that this is what I’m using right now.) Félix > Le 2015-05-19 à 10:12:32, John Criswell <jtcriswel at gmail.com> a écrit : > > On 5/18/15 10:45 PM, Félix Cloutier

On Jun 25, 2010, at 6:24 PM, Félix Cloutier wrote: > Hey guys, > > Whys are there like 5 variants of CreateCall in IRBuilder<> with numbers appended to them? The only difference I can see is the number of arguments. Aren't C++ function overloads be suited for this? An overload could work, but this sort of API makes it more obvious which one you're trying to call and

Hello guys, I'd like to use Clang to parse snippets of (and emit bytecode for) C++ code that come from larger files that don't contain only C++, but looking at the clang interpreter example, either I didn't get it, or it looks like the driver expects only files, and not strings or char buffers. Is there a simple way to achieve this? Do I have to split my input into small files and

Hi all, I have a custom alias analysis pass that enforces that pointers from different address spaces do not alias, and I'm using MemoryDependenceAnalysis to, well, figure out dependence analysis. The AA pass is extremely simple, it only checks the address space of pointers, returns NoAlias if they're different, and delegates otherwise. It is the last alias analysis pass added to my

I am probably stating the obvious, but if the function is side-effect free (onlyReadsMemory) it is valid to remove it. But I am guessing that does not belong to this pass. On Wed, Aug 24, 2016 at 8:38 AM, Sanjoy Das via llvm-dev < llvm-dev at lists.llvm.org> wrote: > Btw, looks like the bug is in runSCCP in > > for (BasicBlock::iterator BI = BB.begin(), E = BB.end(); BI !=

I believe that what I'm trying to do with Clang is fairly simple; the final goal, however, might be a little harder. Knowing myself, there are chances I'll never go through with this project (like Mikael who posted earlier, I'm nothing but an enthusiastic student with lots of time on my hands), but it feels cool enough to me to announce my idea. Besides, I'll probably need help

On Feb 21, 2011, at 6:31 PM, Félix Cloutier wrote: > Hello guys, > > I'd like to use Clang to parse snippets of (and emit bytecode for) C++ code that come from larger files that don't contain only C++, but looking at the clang interpreter example, either I didn't get it, or it looks like the driver expects only files, and not strings or char buffers. > > Is there a