similar to: [LLVMdev] Statically Initialized Arrays

On Wed, 2 Nov 2005, Evan Jones wrote: > I am trying to generate LLVM code that references a global array. > Unfortunately, while I am generating the code I do not know the final length > of the array, as I add elements to it as my compiler goes along. What is the > best way to do this in LLVM? Ideally, I would be able to define the > GlobalVariable array and change its length

On Nov 2, 2005, at 16:39, Chris Lattner wrote: > 4. Replace the old GV with the new GV using code that looks like this: > > OldGV->replaceAllUsesWith(ConstantExpr::getCast(NewGV, > OldGV->getType()); > OldGV->eraseFromParent(); > > At the end of this, any instructions or other globals that referenced > the temporary global will now reference the new one.

> Attaching a new patch that has the behaviour we discussed. > > The "globaldynamic" and default values have been merged, and LLVM will > start off with the user-specified model, but choose a more specific > one if possible. > > Please review. Awesome, thanks! I will try to do a more complete review tonight or tomorrow. For now, just two quick observations *) This

Chris, Thanks for the clarification... at least no bug report is due... and I am glad that I've asked. In my case these transformations are rather useful and forcing them to copy original global variable section is making them compatible with our (rather important) use case, so I guess I will have to fix it locally. Nevertheless if someone else would have a similar issue - I would be

On Wed, Jun 20, 2012 at 9:29 PM, Rafael Espíndola <rafael.espindola at gmail.com> wrote: >> Attaching a new patch that has the behaviour we discussed. >> >> The "globaldynamic" and default values have been merged, and LLVM will >> start off with the user-specified model, but choose a more specific >> one if possible. >> >> Please review.

> 1. How to find all constants in Module? Does this code find all of them, or > they are somewhere else too? > for (GlobalVariable &GV : globals()) { > if (auto C = static_cast<Constant*>(GV.Op<0>().get())) { > ... C is Constant* > } > } Constants are unfortunately part of the Context, not the module :-( Cheers, Rafael

Hello everyone, This is a rather ancient code with Chris's name all over it, so I naturally feel humbled :) I see a conceptual issue in lib/Transforms/IPO/GlobalOpt.cpp with several optimizations that create a copy of GlobalVariable without copying attributes from the original one. Consider this one: http://llvm.org/doxygen/GlobalOpt_8cpp_source.html static bool

Thanks a lot for your help Matthijs! :) basically this does the job quite nicely I think: for (llvm::GlobalVariable::use_iterator U = gv->use_begin(); U != gv->use_end(); ++U) { llvm::Instruction *I = llvm::cast<llvm::Instruction>(U); I->replaceAllUsesWith(constPtr); I->eraseFromParent(); } Cheers, Ralf Matthijs Kooijman wrote: > Hi Ralf, > > >> I

Hi, I have: ... @.str1 = private unnamed_addr constant [21 x i8] c"Now f is a function\0A\00", align 1 ; Function Attrs: ssp uwtable define i32 @_Z1fv() #2 { entry: %call = call i32 (i8*, ...)* @printf(i8* getelementptr inbounds ([21 x i8]* @.str1, i32 0, i32 0)) ret i32 0 } Then I get after trying to erase the function from the module: 511

hi i want replacing a global variable by a constant value for erase instruction. i had seen the code that as follows for (llvm::GlobalVariable::use_iterator U = gv->use_begin(); U != gv->use_end();--U ) { llvm::Instruction *I = llvm::cast<llvm::Instruction>(U); I->replaceAllUsesWith(constPtr); I->eraseFromParent(); } but i dont know how can declare constptr.

Andrew Haley <aph at redhat.com> writes: > Óscar Fuentes wrote: >> The following message is a courtesy copy of an article >> that has been posted to gmane.comp.compilers.llvm.devel as well. >> >> Andrew Haley <aph at redhat.com> writes: >> >>> This is x86_64. I have a problem where an absolute memory load >>> >>> define

Thanks, but I replaceAllUsesWith() - works well, but I still get bug in eraseFromParent(): While deleting: i32 (%class.B*, i32)* %_ZN1B1xEi An asserting value handle still pointed to this value! UNREACHABLE executed at /Users/neonomaly/LLVM/LLVM/lib/VMCore/Value.cpp:561! Yours sincerely, Kadysev Mikhail 21.04.2012, в 23:45, Nick Lewycky написал(а): > Михаил wrote: >> How correctly

How correctly remove function from module? For example: int f1(int x) { ... a = f2(smth); ... } int f2 (int y) { ... b = f1(smth); ... } I need delete from module both f1 and f2. They haven't uses in other part of module, but I can't delete them with eraseFromParent, because they are use each other. Yours sincerely, Kadysev Mikhail -------------- next part

On Tue, Apr 4, 2017 at 12:36 PM, Duncan P. N. Exon Smith < dexonsmith at apple.com> wrote: > > On 2017-Apr-04, at 12:12, Peter Collingbourne <peter at pcc.me.uk> wrote: > > On Mon, Apr 3, 2017 at 8:13 PM, Mehdi Amini <mehdi.amini at apple.com> wrote: > >> >> On Apr 3, 2017, at 7:08 PM, Peter Collingbourne <peter at pcc.me.uk> wrote: >>

Михаил wrote: > How correctly remove function from module? > For example: > > int f1(int x) { > ... > a = f2(smth); > ... > } > int f2 (int y) { > ... > b = f1(smth); > ... > } > > I need delete from module both f1 and f2. They haven't uses in other > part of module, but I can't delete them with eraseFromParent, because > they are use each

It is ModulePass with AnalysisUsage of CallGraph Yours sincerely, Kadysev Mikhail 22.04.2012, в 5:20, Nick Lewycky написал(а): > Михаил wrote: >> Thanks, but I replaceAllUsesWith() - works well, but I still get bug in >> eraseFromParent(): >> >> While deleting: i32 (%class.B*, i32)* %_ZN1B1xEi >> An asserting value handle still pointed to this value! >>

On 23 October 2013 22:41, Vassil Vassilev <vvasilev at cern.ch> wrote: > Hi, > I have: > ... > @.str1 = private unnamed_addr constant [21 x i8] c"Now f is a > function\0A\00", align 1 > ; Function Attrs: ssp uwtable > define i32 @_Z1fv() #2 { > entry: > %call = call i32 (i8*, ...)* @printf(i8* getelementptr inbounds ([21 x > i8]* @.str1, i32 0,

Михаил wrote: > Thanks, but I replaceAllUsesWith() - works well, but I still get bug in > eraseFromParent(): > > While deleting: i32 (%class.B*, i32)* %_ZN1B1xEi > An asserting value handle still pointed to this value! > UNREACHABLE executed at /Users/neonomaly/LLVM/LLVM/lib/VMCore/Value.cpp:561! The replaceAllUsesWith + eraseFromParent pattern remains correct, but there's

Hi, I am trying to replace a global variable with a constant. I did manage to do it, but somehow it appears to be fairly bruteforce by just iterating over all functions/bblocks/instructions and filtering for those that load the variable and replacing the instruction with Instruction::replaceAllUsesWith(). The more intuitive way of iterating over the uses of the variable did not work out as I

Hi Ralf, > I am trying to replace a global variable with a constant. You should be able to replace the initializer for the global with your constant, mark it as having internal linkage and then run some optimization pass over it to do the rest (not sure which one it was again, probably some constant propagation or global value optimization). That pass would then probably do some similar