From 8dff24f378045058444c18fa7bd03a138e3f883d Mon Sep 17 00:00:00 2001 From: Chris Lattner Date: Sat, 14 Jan 2006 00:07:34 +0000 Subject: [PATCH] Implement a new InvalidateStructLayoutInfo method and add some comments git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@25304 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/Target/TargetData.cpp | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/lib/Target/TargetData.cpp b/lib/Target/TargetData.cpp index 75e76fe1860..40b762d8e73 100644 --- a/lib/Target/TargetData.cpp +++ b/lib/Target/TargetData.cpp @@ -131,6 +131,9 @@ TargetData::TargetData(const std::string &ToolName, const Module *M) { BoolAlignment = 1; } +/// Layouts - The lazy cache of structure layout information maintained by +/// TargetData. +/// static std::map, StructLayout> *Layouts = 0; @@ -165,6 +168,21 @@ const StructLayout *TargetData::getStructLayout(const StructType *Ty) const { } } +/// InvalidateStructLayoutInfo - TargetData speculatively caches StructLayout +/// objects. If a TargetData object is alive when types are being refined and +/// removed, this method must be called whenever a StructType is removed to +/// avoid a dangling pointer in this cache. +void TargetData::InvalidateStructLayoutInfo(const StructType *Ty) const { + if (!Layouts) return; // No cache. + + std::map, + StructLayout>::iterator I = Layouts->find(std::make_pair(this, Ty)); + if (I != Layouts->end()) + Layouts->erase(I); +} + + + static inline void getTypeInfo(const Type *Ty, const TargetData *TD, uint64_t &Size, unsigned char &Alignment) { assert(Ty->isSized() && "Cannot getTypeInfo() on a type that is unsized!");