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Updated backpatching during object deserialization to support "smart"
pointers that employ unused bits in a pointer to store extra data. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@43373 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -20,6 +20,7 @@
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/ADT/SmallVector.h"
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#include "llvm/Support/Allocator.h"
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#include "llvm/Support/DataTypes.h"
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#include <vector>
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namespace llvm {
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@ -40,8 +41,11 @@ class Deserializer {
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struct BPatchNode {
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BPatchNode* const Next;
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void*& PtrRef;
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BPatchNode(BPatchNode* n, void*& pref) : Next(n), PtrRef(pref) {}
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uintptr_t& PtrRef;
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BPatchNode(BPatchNode* n, void*& pref)
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: Next(n), PtrRef(reinterpret_cast<uintptr_t&>(pref)) {
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PtrRef = 0;
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}
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};
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struct BPatchEntry {
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@ -126,7 +126,9 @@ void Deserializer::BackpatchPointers() {
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assert (Entry.Ptr && "No pointer found for backpatch.");
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for (BPatchNode* N = Entry.Head; N != NULL; N = N->Next)
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N->PtrRef = Entry.Ptr;
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// Bitwise-OR in the pointer to support "smart" pointers that use
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// unused bits to store extra data.
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N->PtrRef |= reinterpret_cast<uintptr_t>(Entry.Ptr);
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Entry.Head = NULL;
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}
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