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How to insert an instruction that stores the address of a variable in LLVM pass?


Insert the getelementptr instructionUse a particular register for a variable in LLVMllvm pass: How to insert a variable using existing variable valueInserting GetElementpointer Instruction in LLVM IRIn LLVM IR, how to get the pointee Value of a pointer type?How to insert an LLVM StoreInst in a Basic BlockLLVM get possible store instructions for a load instructionHow to get the address of a global variable in LLVM?LLVM Pass to allocate memory at specific addressesIs there any way to know the stack address of stack allocated local variable created using alloca instruction in LLVM













0















If x is an integer variable i.e., int x; -> %x=alloca i32



I want to insert an instruction %add = &(%x) into my IR code through a pass.



Is this possible by GEP instruction or any other means? I mean, %add = gep(x).



My Initial IR,



 %i = alloca i32, align 4
 store volatile i32 50, i32* %i, align 4


for a C code 



i=50;


I want to write a pass from which I get a modified IR like below,



Modified IR,



 %i = alloca i32, align 4
 store volatile i32 50, i32* %i, align 4
 %i_addr = (Get address of i)


Thanks and appreciate the help :)






clang llvm







share|improve this question


























    0















    If x is an integer variable i.e., int x; -> %x=alloca i32



    I want to insert an instruction %add = &(%x) into my IR code through a pass.



    Is this possible by GEP instruction or any other means? I mean, %add = gep(x).



    My Initial IR,



     %i = alloca i32, align 4
     store volatile i32 50, i32* %i, align 4


    for a C code 



    i=50;


    I want to write a pass from which I get a modified IR like below,



    Modified IR,



     %i = alloca i32, align 4
     store volatile i32 50, i32* %i, align 4
     %i_addr = (Get address of i)


    Thanks and appreciate the help :)






    clang llvm







    share|improve this question
























      0












      0








      0








      If x is an integer variable i.e., int x; -> %x=alloca i32



      I want to insert an instruction %add = &(%x) into my IR code through a pass.



      Is this possible by GEP instruction or any other means? I mean, %add = gep(x).



      My Initial IR,



       %i = alloca i32, align 4
       store volatile i32 50, i32* %i, align 4


      for a C code 



      i=50;


      I want to write a pass from which I get a modified IR like below,



      Modified IR,



       %i = alloca i32, align 4
       store volatile i32 50, i32* %i, align 4
       %i_addr = (Get address of i)


      Thanks and appreciate the help :)






      clang llvm







      share|improve this question














      If x is an integer variable i.e., int x; -> %x=alloca i32



      I want to insert an instruction %add = &(%x) into my IR code through a pass.



      Is this possible by GEP instruction or any other means? I mean, %add = gep(x).



      My Initial IR,



       %i = alloca i32, align 4
       store volatile i32 50, i32* %i, align 4


      for a C code 



      i=50;


      I want to write a pass from which I get a modified IR like below,



      Modified IR,



       %i = alloca i32, align 4
       store volatile i32 50, i32* %i, align 4
       %i_addr = (Get address of i)


      Thanks and appreciate the help :)






      clang llvm




      clang llvm






      share|improve this question













      share|improve this question











      share|improve this question




      share|improve this question










      asked Mar 7 at 20:20









      ArjunArjun

      786




      786






















          1 Answer
          1






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          oldest

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          1














          %i is already the address of the variable i -- you can see its type is i32*, which is a pointer. To get the value of i (50 in your example) you would need a load instruction.






          share|improve this answer






















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            %i is already the address of the variable i -- you can see its type is i32*, which is a pointer. To get the value of i (50 in your example) you would need a load instruction.






            share|improve this answer



























              1














              %i is already the address of the variable i -- you can see its type is i32*, which is a pointer. To get the value of i (50 in your example) you would need a load instruction.






              share|improve this answer

























                1












                1








                1







                %i is already the address of the variable i -- you can see its type is i32*, which is a pointer. To get the value of i (50 in your example) you would need a load instruction.






                share|improve this answer













                %i is already the address of the variable i -- you can see its type is i32*, which is a pointer. To get the value of i (50 in your example) you would need a load instruction.







                share|improve this answer












                share|improve this answer



                share|improve this answer










                answered Mar 8 at 2:32









                Ismail BadawiIsmail Badawi

                24k56786




                24k56786





























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