similar to: [LLVMdev] ReplaceInstWithInst problem

Hi, In my IR code, I have the following: %arr = alloca [30 x i8], align 1 %arraydecay = getelementptr inbounds [16 x i8]* %arr, i32 0, i32 0 %arraydecay1 = getelementptr inbounds [16 x i8]* %arr, i32 0, i32 0 I'm trying to change the capacity of arr via a function pass. I've written the following code in my function pass: ArrayType* b =

Create a new alloca instruction, insert it into the IR right before (or after) the old one, RAUW the value, then delete the old instruction. You should be able to find a variety of examples of this sort of thing in most of the IR level optimization passes. I’d look at InstCombine in particular. -Jim On Dec 4, 2013, at 1:40 PM, Shivam Bhagi <shivam.bhagi at outlook.com> wrote: > Hi,

Hi, While looking over the IR generated by my source code, I came across the following: %arr = alloca [30 x i8], align 1 In the source code this particular line of code is represented by: int arr[30]; I was wondering how I could change the capacity of arr from 30 to any other integral value via a function-pass. I know that 'alloca' can be used for reserving space on stack; further,

Hi, For the following code const Type * Int32Type = IntegerType::getInt32Ty(getGlobalContext()); AllocaInst* newInst = new AllocaInst(Int32Type, 0, "flag", Bb); Bb->getInstList().push_back(newInst); It gives me the error " error: no matching constructor for initialization of 'llvm::AllocaInst' AllocaInst* newInst = new

On May 7, 2011, at 1:00 PM, llvmdev-request at cs.uiuc.edu wrote: > > Hi Justin, > >> I have a call to ReplaceInstWithInst(Instruction *From, Instruction *To) inside of a for loop iterating through a BasicBlock::iterator. On the very next pass after I replace the instruction, the iterator appears to be invalidated. Is this supposed to happen or am I doing something silly? Is

Thank you for your help I tried Instruction* p=&( Bb->front()); Type * Int32Type = IntegerType::getInt32Ty(getGlobalContext()); AllocaInst* newInst = new AllocaInst(Int32Type,"flag", p); that works well but I need to store the value of the variable too. What's the method that could be used to store specific value?? On 30 July 2013 16:01, John Criswell

Please keep replies on the list. Now you've missed "InputIterator must be a random-access iterator pointing to contiguous storage (e.g. a std::vector<>::iterator). Checks are made for random-accessness but not for contiguous storage as that would incur runtime overhead." from CallInst's constructor (although that comment should be on Create()). Function::arg_iterator

On 7/30/13 7:44 AM, Rasha Omar wrote: > Hi, > I need to insert new instruction into every basic block like x=1 > or while loop > I tried this code, but it doesn't work > > Type * Int32Type = IntegerType::getInt32Ty(getGlobalContext()); > AllocaInst* newInst = new AllocaInst(Int32Type,"flag", Bb); > Bb->getInstList().push_back(newInst); The problem is

Hello all; So my goal is to insert some (self-written) function calls in the LLVM IR. I can achieve it with a ModulePass and using the getOrInsertFunction() call. For a ModulePass I follow the steps- 1. Compile the code (in which call instructions are to be inserted) to LLVM IR 2. Compile the file (which contains the *called* external function ) to LLVM IR 3. Link them together and run the

Hello, I have a call to ReplaceInstWithInst(Instruction *From, Instruction *To) inside of a for loop iterating through a BasicBlock::iterator. On the very next pass after I replace the instruction, the iterator appears to be invalidated. Is this supposed to happen or am I doing something silly? Is there a more appropriate way to do this? Thanks, -Justin

I am trying to change this define void @main(float* noalias %arg0, float* noalias %arg1, float* noalias %arg2) { entrypoint: %0 = bitcast float* %arg1 to <4 x float>* intothis define void @main(float* noalias %arg0, float* noalias %arg1, float* noalias %arg2) { entrypoint: %0 = getelementptr float* %arg1, i64 0 %1 = bitcast float* %0 to <4 x float>* I must be close but

Hi, I need to insert new instruction into every basic block like x=1 or while loop I tried this code, but it doesn't work Type * Int32Type = IntegerType::getInt32Ty(getGlobalContext()); AllocaInst* newInst = new AllocaInst(Int32Type,"flag", Bb); Bb->getInstList().push_back(newInst); the error: void llvm::SymbolTableListTraits<llvm::Instruction,

While it is great that LLVM has an IR Verifier, its a little troublesome to use because it separates the point of detection from the source of the problem. That is, the verifier gets run on a module or function after its been built. By that point, the compiler's state has moved past the point at which the error was placed into the module or function. Trying to track down the source of the

Hi, This is probably more of a standard C++ question instead of an actual LLVM question, but here it goes anyway. I'm trying to invoke the following constructor: CallInst::CallInst(Value *Func, InputIterator ArgBegin, InputIterator ArgEnd, const Twine &NameStr, BasicBlock *InsertAtEnd); My code is: using namespace llvm; void replaceByClone(Function *f, CallInst *I){ Function *clone =

Hi, I created a global char array, char buffer[1024]. I want to call a function to append the string information to the buffer repeatedly. For example, I need to implement the following code, where length, a, b, c, are global variables. int length = 0; length += sprintf(buffer+length, "str%d", a); length += sprintf(buffer+length, "str%c", b); length += sprintf(buffer+length,

I have a module having the blockaddress instruction. When I link it into another module and delete the original, blockaddress disappears and is replaced by inttoptr (i32 1 to i8*). Please compile and run the attached program to see the demo of this problem. Right after linking modules, blockaddress still exists: @switch.bbs = internal global [3 x i8*] [i8* blockaddress(@my_func,

Hi Tim, My mistake not including the llvm-dev, excuse me. affinityElement.__bits[0] worked fine for me, thank you. I am new in using the API for Constants and I am facing the error "incomplete type is not allowed" on the last last of below code: Type * ET = IntegerType::getInt64Ty(I.getContext()); unsigned long size = cpuAffinityVector.size(); ArrayType * AT = ArrayType::get(ET,size);

Hi all, I was trying to implement an obfuscation tool for C-code on the basis of LLVM. I got a prototype of the simple obfuscation transformation which converting control flow graph to something like a state machine. I am not sure I will have time to work on extending further this tool with new transformations like opaque predicates and decided to put here source code I have by now with hope

Hello; Thanks to Eli for the pointer to the ConstantDataArray::getString() fucntion. Now I am trying to declare a global char array with the content "hi" and call a function "print" (which takes a char pointer and return an insteger. I am doing the following in the code - Function Creation: PointerType* array = PointerType::get(IntegerType::getInt8Ty(getGlobalContext())

Hello, I'm trying to translate part of Java code in LLVM code. I have some problems with the "opaque type", I think because I did not understand how to use. So, the java code is: int[] ai; .... ai = new int[1]; I am using LLVM API in this way: //I create a pointer of Opaque type, because I don't know yet the array size! OpaqueType* ot = OpaqueType::get(); AllocaInst*