[llvm-commits] [llvm] r66393 - /llvm/trunk/lib/VMCore/Instructions.cpp
Chris Lattner
sabre at nondot.org
Sun Mar 8 21:46:40 PDT 2009
Author: lattner
Date: Sun Mar 8 23:46:40 2009
New Revision: 66393
URL: http://llvm.org/viewvc/llvm-project?rev=66393&view=rev
Log:
Fix PR3746 - Crash in isel with GEP of function pointer
by checking that the top-level type of a gep is sized. This
causes us to reject the example with:
llvm-as: t2.ll:2:16: invalid getelementptr indices
getelementptr i32()* null, i32 1
^
Modified:
llvm/trunk/lib/VMCore/Instructions.cpp
Modified: llvm/trunk/lib/VMCore/Instructions.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/VMCore/Instructions.cpp?rev=66393&r1=66392&r2=66393&view=diff
==============================================================================
--- llvm/trunk/lib/VMCore/Instructions.cpp (original)
+++ llvm/trunk/lib/VMCore/Instructions.cpp Sun Mar 8 23:46:40 2009
@@ -1037,26 +1037,30 @@
init(Ptr, Idx, Name);
}
-// getIndexedType - Returns the type of the element that would be loaded with
-// a load instruction with the specified parameters.
-//
-// The Idxs pointer should point to a continuous piece of memory containing the
-// indices, either as Value* or uint64_t.
-//
-// A null type is returned if the indices are invalid for the specified
-// pointer type.
-//
+/// getIndexedType - Returns the type of the element that would be accessed with
+/// a gep instruction with the specified parameters.
+///
+/// The Idxs pointer should point to a continuous piece of memory containing the
+/// indices, either as Value* or uint64_t.
+///
+/// A null type is returned if the indices are invalid for the specified
+/// pointer type.
+///
template <typename IndexTy>
-static const Type* getIndexedTypeInternal(const Type *Ptr,
- IndexTy const *Idxs,
- unsigned NumIdx) {
+static const Type* getIndexedTypeInternal(const Type *Ptr, IndexTy const *Idxs,
+ unsigned NumIdx) {
const PointerType *PTy = dyn_cast<PointerType>(Ptr);
if (!PTy) return 0; // Type isn't a pointer type!
const Type *Agg = PTy->getElementType();
- // Handle the special case of the empty set index set...
+ // Handle the special case of the empty set index set, which is always valid.
if (NumIdx == 0)
return Agg;
+
+ // If there is at least one index, the top level type must be sized, otherwise
+ // it cannot be 'stepped over'.
+ if (!Agg->isSized())
+ return 0;
unsigned CurIdx = 1;
for (; CurIdx != NumIdx; ++CurIdx) {
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