similar to: [LLVMdev] module functions

Dear All, To add to this, you can find examples of inserting NOPs for X86 in the CFI pass originally written at Lehigh University that we ported to 64-bit X86 for SVA: https://github.com/jtcriswell/SVA/blob/master/llvm/lib/Target/X86/X86CFIOptPass.cpp Alternatively, you could use an InlineAsm call at the LLVM IR level (which I think would be easier to implement). Regards, John Criswell On

My pass runs after optimization passes. On Thu, Jul 9, 2015 at 1:11 PM, David Chisnall <David.Chisnall at cl.cam.ac.uk> wrote: > Hi, > > What are you trying to achieve? Inserting NOPs into LLVM IR is likely to > be pointless, as optimisations (in the IR or SelectionDAG) will remove them > before machine code generation. If you want to insert NOPs into the > generated

Hi. I need to write a function pass that insert nop instruction in function. Examples of these instructions are: %nop = add i1 0, 0 or %nop = alloca i1, i1 0. This link couldn't help me: http://llvm.org/docs/ProgrammersManual.html#creating-and-inserting-new-instructions I need a clear example about inserting new instruction. Anyone can help me? Thanks. -------------- next part --------------

Hi Bill, I am using the following version of BuildMI : MachineInstrBuilder BuildMI(MachineFunction &MF, const TargetInstrDesc &TID, unsigned DestReg) I do the following : void createInstrs(std::vector<MachineInstr *>& ilist) { Machine Instr *mi; mi = BuildMI(MF, someTID, somereg);

Hello, I am a newbie to LLVM and right now I am on the hook to parse some IR code and do some instrumentations. However, my problem is that no matter how I tweak my parsing code, it simply cannot print out anything. So here is my C code: int your_fun(int arg2) { int x = arg2; return x+2; } And here is my parsing code: #include <llvm/IR/Module.h> #include

​Hi. I want to change order of code basic blocks in memory. I visited " http://llvm.org/docs/ExtendingLLVM.html" page and it advised me to ask it before any effort. What parts of LLVM help me and how? I am a newbie on LLVM. Thanks. -------------- next part -------------- An HTML attachment was scrubbed... URL:

Hi, Thank you guys for helping me out with my previous questions. I am new to LLVM, and I'm getting stuck trying to do some basic stuff: Currently, I'm trying to move all the basic blocks of one function into another one, and at some point insert a branch into the moved function's entry point. The best way which I've found is to use CloneBasicBlock (from Cloning.h). However, I

On Thu, Jun 25, 2009 at 12:32 AM, ihusar<ihusar at fit.vutbr.cz> wrote: >                //now i need to create an instruction that represents a call to a intrinsic >                Function* FIntr = Intrinsic::getDeclaration(&M, Intrinsic::regread_i32); > >                // here it fails: void llvm::CallInst::init(llvm::Value*): >                //Assertion

Hi, I'm trying to inline function defined in another bitcode module via bitcode modification. I'm linking multiple bitcode modules, setting inline related attributes, applying -always-inline pass, but then debug info error occurs. It seems debug info metadata isn't properly updated on inlining. How can I fix it? I'm using LLVM 3.8.1 on OS X (On below example target is Android but

Hi, supposing I have a function “foo” like the following: int foo(int a, int b) { ... ... } I want to insert int the LLVM IR a call instructions to a function “bar” that requires the same parameters of foo. So my function foo will become: int foo(int a, int b) { bar(a,b); … ... } I am using the following code: bool ThreadSanitizer::runOnFunction(Function &F) {

Hi everyone, I am trying to write a pass, that finds some instructions and replaces them with my intrinsics, but I am having problem understanding, how this should be done. Let's say I have this instruction: %tmp14 = load i32* getelementptr ([32 x i32]* @gpregs, i32 0, i64 28) and i need to read the load's operands and replace it by let's say: %tmp14 = call i32

Hello,  I wish to reduce a function CFG to its entry block. I wrote the following code using lib/IR/Function.cpp/Function::dropAllReferences() (from llvm-3.6) as reference:  Function *F; // Suitably initialized. BasicBlock *FEntryBlock = &F->getEntryBlock(); FEntryBlock->getTerminator()->eraseFromParent(); FEntryBlock->removeFromParent(); for (Function::iterator I = F->begin(),

I am seeing the following assertion in leak detector. /llvm/lib/VMCore/LeakDetector.cpp:43: void<unnamed>::LeakDetectorImpl<T>::addGarbage(const T*) [with T = void]: Assertion `Ts.count(Cache) == 0 && "Object already in set!"' failed. I am creating a list of instructions using BuildMI() and adding them to a basic block using BB->insert(). I am seeing this

On Wed, Jun 3, 2009 at 5:10 PM, Manjunath Kudlur <keveman at gmail.com> wrote: > I am seeing the following assertion in leak detector. > > /llvm/lib/VMCore/LeakDetector.cpp:43: > void<unnamed>::LeakDetectorImpl<T>::addGarbage(const T*) [with T = > void]: Assertion `Ts.count(Cache) == 0 && "Object already in set!"' > failed. > > I am

On Fri, May 15, 2015 at 11:20 PM, Teresa Johnson <tejohnson at google.com> wrote: > On Fri, May 15, 2015 at 2:52 PM, David Blaikie <dblaikie at gmail.com> wrote: >> >> >> On Fri, May 15, 2015 at 1:15 PM, Teresa Johnson <tejohnson at google.com> >> wrote: >>> >>> On Fri, May 15, 2015 at 10:04 AM, David Blaikie <dblaikie at

Every inlinable call in a function that has debug info (F->getSubprogram() returns non-null) must have a DebugLoc associated with it that has a scope chain that ends in that same DISubprogram. https://llvm.org/docs/SourceLevelDebugging.html discusses some of the debug info IR metadata in LLVM. On Fri, Feb 2, 2018 at 1:03 AM Ku Nanashi via llvm-dev < llvm-dev at lists.llvm.org> wrote:

> Every inlinable call in a function that has debug info (F->getSubprogram() returns non-null) must have a DebugLoc associated with it that has a scope chain that ends in that same DISubprogram. Thank you for the comment! I don't know if this is a proper way to fix, but after I add DebugLoc same as inserting position instruction, no error occurs.

On Tue, May 19, 2015 at 12:41 PM, David Blaikie <dblaikie at gmail.com> wrote: > > > On Mon, May 18, 2015 at 9:09 PM, Teresa Johnson <tejohnson at google.com> > wrote: >> >> On Fri, May 15, 2015 at 11:20 PM, Teresa Johnson <tejohnson at google.com> >> wrote: >> > On Fri, May 15, 2015 at 2:52 PM, David Blaikie <dblaikie at gmail.com>

Hi, we have two modules, one that we basically use as a library in which we store a lot of simple function calls, the other is small program generated at run-time. Whenever a function call for to one of the builtin functions is being called we use CloneFunction to clone the instruction from the library module and insert it in the generated module. The problem is for example when we have

Hello everyone, I'm new to LLVM (which is a really great project by the way) and I hope this is the right place for my question. In the LLVM Language Reference Manual I found the "jumptable" function attribute, which seems to be exactly what I need for my project (where I want to add one level of indirection to every function call), but I have trouble figuring out, how to use