[llvm-commits] [llvm] r85189 - in /llvm/trunk: include/llvm/Intrinsics.td lib/CodeGen/SelectionDAG/SelectionDAGBuild.cpp lib/Transforms/Scalar/SimplifyLibCalls.cpp

[Nick Lewycky]

Eric Christopher wrote:
> Author: echristo
> Date: Mon Oct 26 19:52:25 2009
> New Revision: 85189
> 
> URL: http://llvm.org/viewvc/llvm-project?rev=85189&view=rev
> Log:
> Add objectsize intrinsic and hook it up through codegen. Doesn't
> do anything than return "I don't know" at the moment.

Please document this in the LangRef.

Nick

> Modified:
>     llvm/trunk/include/llvm/Intrinsics.td
>     llvm/trunk/lib/CodeGen/SelectionDAG/SelectionDAGBuild.cpp
>     llvm/trunk/lib/Transforms/Scalar/SimplifyLibCalls.cpp
> 
> Modified: llvm/trunk/include/llvm/Intrinsics.td
> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/Intrinsics.td?rev=85189&r1=85188&r2=85189&view=diff
> 
> ==============================================================================
> --- llvm/trunk/include/llvm/Intrinsics.td (original)
> +++ llvm/trunk/include/llvm/Intrinsics.td Mon Oct 26 19:52:25 2009
> @@ -259,6 +259,11 @@
>  def int_sigsetjmp  : Intrinsic<[llvm_i32_ty] , [llvm_ptr_ty, llvm_i32_ty]>;
>  def int_siglongjmp : Intrinsic<[llvm_void_ty], [llvm_ptr_ty, llvm_i32_ty]>;
>  
> +// Internal interface for object size checking
> +def int_objectsize : Intrinsic<[llvm_anyint_ty], [llvm_ptr_ty, llvm_i32_ty],
> +                               [IntrReadArgMem]>,
> +                               GCCBuiltin<"__builtin_object_size">;
> +
>  //===-------------------- Bit Manipulation Intrinsics ---------------------===//
>  //
>  
> 
> Modified: llvm/trunk/lib/CodeGen/SelectionDAG/SelectionDAGBuild.cpp
> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/SelectionDAG/SelectionDAGBuild.cpp?rev=85189&r1=85188&r2=85189&view=diff
> 
> ==============================================================================
> --- llvm/trunk/lib/CodeGen/SelectionDAG/SelectionDAGBuild.cpp (original)
> +++ llvm/trunk/lib/CodeGen/SelectionDAG/SelectionDAGBuild.cpp Mon Oct 26 19:52:25 2009
> @@ -4204,6 +4204,18 @@
>      DAG.setRoot(Result);
>      return 0;
>    }
> +  case Intrinsic::objectsize: {
> +    // If we don't know by now, we're never going to know.
> +    ConstantInt *CI = dyn_cast<ConstantInt>(I.getOperand(2));
> +
> +    assert(CI && "Non-constant type in __builtin_object_size?");
> +
> +    if (CI->getZExtValue() < 2)
> +      setValue(&I, DAG.getConstant(-1, MVT::i32));
> +    else
> +      setValue(&I, DAG.getConstant(0, MVT::i32));
> +    return 0;
> +  }
>    case Intrinsic::var_annotation:
>      // Discard annotate attributes
>      return 0;
> 
> Modified: llvm/trunk/lib/Transforms/Scalar/SimplifyLibCalls.cpp
> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Transforms/Scalar/SimplifyLibCalls.cpp?rev=85189&r1=85188&r2=85189&view=diff
> 
> ==============================================================================
> --- llvm/trunk/lib/Transforms/Scalar/SimplifyLibCalls.cpp (original)
> +++ llvm/trunk/lib/Transforms/Scalar/SimplifyLibCalls.cpp Mon Oct 26 19:52:25 2009
> @@ -509,6 +509,27 @@
>  }
>  
>  //===----------------------------------------------------------------------===//
> +// Miscellaneous LibCall/Intrinsic Optimizations
> +//===----------------------------------------------------------------------===//
> +
> +namespace {
> +struct SizeOpt : public LibCallOptimization {
> +  virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
> +    // TODO: We can do more with this, but delaying to here should be no change
> +    // in behavior.
> +    ConstantInt *Const = dyn_cast<ConstantInt>(CI->getOperand(2));
> +    
> +    if (!Const) return 0;
> +    
> +    if (Const->getZExtValue() < 2)
> +      return Constant::getAllOnesValue(Const->getType());
> +    else
> +      return ConstantInt::get(Const->getType(), 0);
> +  }
> +};
> +}
> +
> +//===----------------------------------------------------------------------===//
>  // String and Memory LibCall Optimizations
>  //===----------------------------------------------------------------------===//
>  
> @@ -1548,6 +1569,7 @@
>      // Formatting and IO Optimizations
>      SPrintFOpt SPrintF; PrintFOpt PrintF;
>      FWriteOpt FWrite; FPutsOpt FPuts; FPrintFOpt FPrintF;
> +    SizeOpt ObjectSize;
>  
>      bool Modified;  // This is only used by doInitialization.
>    public:
> @@ -1653,6 +1675,9 @@
>    Optimizations["fwrite"] = &FWrite;
>    Optimizations["fputs"] = &FPuts;
>    Optimizations["fprintf"] = &FPrintF;
> +  
> +  // Miscellaneous
> +  Optimizations["llvm.objectsize"] = &ObjectSize;
>  }
>  
>  
> 
> 
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