================
@@ -326,25 +326,25 @@ struct LazyOffsetPtr {
///
/// If the low bit is clear, a pointer to the AST node. If the low
/// bit is set, the upper 63 bits are the offset.
- mutable uint64_t Ptr = 0;
+ mutable uintptr_t Ptr = 0;
public:
LazyOffsetPtr() = default;
- explicit LazyOffsetPtr(T *Ptr) : Ptr(reinterpret_cast<uint64_t>(Ptr)) {}
+ explicit LazyOffsetPtr(T *Ptr) : Ptr(reinterpret_cast<uintptr_t>(Ptr)) {}
- explicit LazyOffsetPtr(uint64_t Offset) : Ptr((Offset << 1) | 0x01) {
- assert((Offset << 1 >> 1) == Offset && "Offsets must require < 63 bits");
+ explicit LazyOffsetPtr(uintptr_t Offset) : Ptr((Offset << 1) | 0x01) {
+ assert((Offset << 1 >> 1) == Offset && "Offsets must fit in addressable
bits");
if (Offset == 0)
Ptr = 0;
}
LazyOffsetPtr &operator=(T *Ptr) {
- this->Ptr = reinterpret_cast<uint64_t>(Ptr);
+ this->Ptr = reinterpret_cast<uintptr_t>(Ptr);
return *this;
}
- LazyOffsetPtr &operator=(uint64_t Offset) {
- assert((Offset << 1 >> 1) == Offset && "Offsets must require < 63 bits");
+ LazyOffsetPtr &operator=(uintptr_t Offset) {
----------------
ChuanqiXu9 wrote:
Some update: the higher 32 bits are required here:
https://github.com/llvm/llvm-project/blob/d54953ef472bfd8d4b503aae7682aa76c49f8cc0/clang/include/clang/AST/ExternalASTSource.h#L580-L582
where the `GlobalDeclID`'s higher 32 bits are meaningful. And we may get the
`Ptr` converted to `GlobalDeclID` here:
`https://github.com/llvm/llvm-project/blob/d54953ef472bfd8d4b503aae7682aa76c49f8cc0/clang/include/clang/AST/ExternalASTSource.h#L378`
so we need to preserve at least 64 bits in this structure.
https://github.com/llvm/llvm-project/pull/111995
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