add getUnderlyingObjectSize()
this is similar to getObjectSize(), but doesnt subtract the offset
tweak the BasicAA code accordingly (per PR14988)
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@176407 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Analysis/MemoryBuiltins.cpp b/lib/Analysis/MemoryBuiltins.cpp
index 0fc0550..90f5811 100644
--- a/lib/Analysis/MemoryBuiltins.cpp
+++ b/lib/Analysis/MemoryBuiltins.cpp
@@ -360,6 +360,26 @@
return true;
}
+/// \brief Compute the size of the underlying object pointed by Ptr. Returns
+/// true and the object size in Size if successful, and false otherwise.
+/// If RoundToAlign is true, then Size is rounded up to the aligment of allocas,
+/// byval arguments, and global variables.
+bool llvm::getUnderlyingObjectSize(const Value *Ptr, uint64_t &Size,
+ const DataLayout *TD,
+ const TargetLibraryInfo *TLI,
+ bool RoundToAlign) {
+ if (!TD)
+ return false;
+
+ ObjectSizeOffsetVisitor Visitor(TD, TLI, Ptr->getContext(), RoundToAlign);
+ SizeOffsetType Data = Visitor.compute(const_cast<Value*>(Ptr));
+ if (!Visitor.knownSize(Data))
+ return false;
+
+ Size = Data.first.getZExtValue();
+ return true;
+}
+
STATISTIC(ObjectVisitorArgument,
"Number of arguments with unsolved size and offset");