[LLVMdev] inserting a print statement into IR

[George Baah]

This is the seg fault I am getting.

dyld: lazy symbol binding failed: Symbol not found:
__ZN4llvm13IRBuilderBase18CreateGlobalStringEPKcRKNS_5TwineE
  Referenced from:
/Users/georgebaah/llvm_dir/llvm-2.8/Debug+Asserts/lib/LLVMArrayBoundsCheck.dylib
  Expected in: flat namespace

dyld: Symbol not found:
__ZN4llvm13IRBuilderBase18CreateGlobalStringEPKcRKNS_5TwineE
  Referenced from:
/Users/georgebaah/llvm_dir/llvm-2.8/Debug+Asserts/lib/LLVMArrayBoundsCheck.dylib
  Expected in: flat namespace

0  opt                        0x0045e01c
llvm::SearchForAddressOfSpecialSymbol(char const*) + 284
1  opt                        0x0045e61e llvm::sys::RunInterruptHandlers() +
354
2  libSystem.B.dylib          0x93bcb2bb _sigtramp + 43
3  libSystem.B.dylib          0xffffffff _sigtramp + 1816350063
4  libSystem.B.dylib          0x8fe18c2f _sigtramp + 18446744073644857759
5  LLVMArrayBoundsCheck.dylib 0x0102c9df
6  LLVMArrayBoundsCheck.dylib 0x0102ca95
7  LLVMArrayBoundsCheck.dylib 0x0102ce2c
8  LLVMArrayBoundsCheck.dylib 0x0102ceec
9  opt                        0x003d265b
llvm::FPPassManager::doInitialization(llvm::Module&) + 63
10 opt                        0x003d6062
llvm::FPPassManager::runOnModule(llvm::Module&) + 24
11 opt                        0x003d5b4d
llvm::MPPassManager::runOnModule(llvm::Module&) + 375
12 opt                        0x003d5d9c
llvm::PassManagerImpl::run(llvm::Module&) + 112
13 opt                        0x003d5df5
llvm::PassManager::run(llvm::Module&) + 27
14 opt                        0x0000d68e main + 4026
15 opt                        0x00002146 start + 54
16 opt                        0x00000005 start + 18446744073709543157
Stack dump:
0.      Program arguments: opt -mem2reg -load
../llvm-2.8/Debug+Asserts/lib/LLVMArrayBoundsCheck.dylib -paa
1.      Running pass 'Function Pass Manager' on module '<stdin>'.
Segmentation fault


On Mon, Apr 4, 2011 at 11:33 PM, John Criswell <criswell at illinois.edu>wrote:

>  On 4/4/2011 6:26 PM, George Baah wrote:
>
>  Hi Everyone,
>   I am trying to construct the print statement : printf("value:%d\n",
> value);
> This is my llvm code. It is seg faulting at
> builder.CreateGlobalStringPtr(str,"").
>
>
> This might be easier to debug with a stack trace.  Use a debugger to see
> the call stack when the segfault occurs.  Also try to isolate which pointer
> value is bad.
>
> As a guess, did you give the builder object all the information it needs to
> insert IR (e.g., which LLVM Module * it is modifying, which BasicBlock or
> Instruction it is to use when inserting instructions, etc)?
>
> -- John T.
>
>
>  Thanks.
>
>  George
>
>  vector<const Type *> params;
> params.push_back(Type::getInt8PtrTy(M.getContext()));
> FunctionType *fType =
> FunctionType::get(Type::getInt32Ty(M.getContext()), params, true);
> Constant *temp = M.getOrInsertFunction("printf",fType);
> if(!temp){
>   errs() << "printf function not in symbol table\n";
>   exit(1);
> }
> Function *f = cast<Function>(temp);
> f->setCallingConv(CallingConv::C);
>
>  const char *str = "value: %d\n";
> Value *intparam = ...
>  Value *strPtr = builder.CreateGlobalStringPtr(str,"");
>  builder.CreateCall2(PrintF, strPtr, intparam,"tmp6");
>
>
>
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