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Add a comment about the "getelementptr null" trick.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77262 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman 2009-07-27 21:59:50 +00:00
parent 224251d18e
commit f08583b532
1 changed files with 1 additions and 0 deletions
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lib/VMCore/LLVMContext.cpp
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@ -419,6 +419,7 @@ Constant* LLVMContext::getConstantExprInsertValue(Constant* Agg, Constant* Val,
Constant* LLVMContext::getConstantExprSizeOf(const Type* Ty) {
// sizeof is implemented as: (i64) gep (Ty*)null, 1
// Note that a non-inbounds gep is used, as null isn't within any object.
Constant *GEPIdx = ConstantInt::get(Type::Int32Ty, 1);
Constant *GEP = getConstantExprGetElementPtr(
getNullValue(getPointerTypeUnqual(Ty)), &GEPIdx, 1);