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Updated backpatching during object deserialization to support "smart" 

pointers that employ unused bits in a pointer to store extra data.

llvm-svn: 43373
This commit is contained in:
Ted Kremenek 2007-10-25 23:40:35 +00:00
parent fc69d322f2
commit 542e5f29b7
2 changed files with 9 additions and 3 deletions
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8
llvm/include/llvm/Bitcode/Deserialize.h
View File

@ -20,6 +20,7 @@
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/Support/Allocator.h"
#include "llvm/Support/DataTypes.h"
#include <vector>
namespace llvm {
@ -40,8 +41,11 @@ class Deserializer {
struct BPatchNode {
BPatchNode* const Next;
void*& PtrRef;
BPatchNode(BPatchNode* n, void*& pref) : Next(n), PtrRef(pref) {}
uintptr_t& PtrRef;
BPatchNode(BPatchNode* n, void*& pref)
: Next(n), PtrRef(reinterpret_cast<uintptr_t&>(pref)) {
PtrRef = 0;
}
};
struct BPatchEntry {

4
llvm/lib/Bitcode/Reader/Deserialize.cpp
View File

@ -126,7 +126,9 @@ void Deserializer::BackpatchPointers() {
assert (Entry.Ptr && "No pointer found for backpatch.");
for (BPatchNode* N = Entry.Head; N != NULL; N = N->Next)
N->PtrRef = Entry.Ptr;
// Bitwise-OR in the pointer to support "smart" pointers that use
// unused bits to store extra data.
N->PtrRef |= reinterpret_cast<uintptr_t>(Entry.Ptr);
Entry.Head = NULL;
}