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add a Vtable kind of symbolic allocations

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This commit is contained in:
Ralf Jung 2022-07-17 11:36:37 -04:00
parent a7468c60f8
commit da5e4d73f1
11 changed files with 106 additions and 15 deletions
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8
compiler/rustc_codegen_llvm/src/common.rs
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@ -240,6 +240,13 @@ impl<'ll, 'tcx> ConstMethods<'tcx> for CodegenCx<'ll, 'tcx> {
}
Scalar::Ptr(ptr, _size) => {
let (alloc_id, offset) = ptr.into_parts();
// For vtables, get the underlying data allocation.
let alloc_id = match self.tcx.global_alloc(alloc_id) {
GlobalAlloc::Vtable(ty, trait_ref) => {
self.tcx.vtable_allocation((ty, trait_ref))
}
_ => alloc_id,
};
let (base_addr, base_addr_space) = match self.tcx.global_alloc(alloc_id) {
GlobalAlloc::Memory(alloc) => {
let init = const_alloc_to_llvm(self, alloc);
@ -257,6 +264,7 @@ impl<'ll, 'tcx> ConstMethods<'tcx> for CodegenCx<'ll, 'tcx> {
self.get_fn_addr(fn_instance.polymorphize(self.tcx)),
self.data_layout().instruction_address_space,
),
GlobalAlloc::Vtable(..) => bug!("vtables are already handled"),
GlobalAlloc::Static(def_id) => {
assert!(self.tcx.is_static(def_id));
assert!(!self.tcx.is_thread_local_static(def_id));