//! Codegen vtables and vtable accesses.
//!
//! See `rustc_codegen_ssa/src/meth.rs` for reference.
-// FIXME dedup this logic between miri, cg_llvm and cg_clif
+use crate::constant::data_id_for_alloc_id;
use crate::prelude::*;
-use super::constant::pointer_for_allocation;
-fn vtable_memflags() -> MemFlags {
+pub(crate) fn vtable_memflags() -> MemFlags {
let mut flags = MemFlags::trusted(); // A vtable access is always aligned and will never trap.
flags.set_readonly(); // A vtable is always read-only.
flags
pub(crate) fn drop_fn_of_obj(fx: &mut FunctionCx<'_, '_, '_>, vtable: Value) -> Value {
let usize_size = fx.layout_of(fx.tcx.types.usize).size.bytes() as usize;
fx.bcx.ins().load(
- pointer_ty(fx.tcx),
+ fx.pointer_type,
vtable_memflags(),
vtable,
(ty::COMMON_VTABLE_ENTRIES_DROPINPLACE * usize_size) as i32,
pub(crate) fn size_of_obj(fx: &mut FunctionCx<'_, '_, '_>, vtable: Value) -> Value {
let usize_size = fx.layout_of(fx.tcx.types.usize).size.bytes() as usize;
fx.bcx.ins().load(
- pointer_ty(fx.tcx),
+ fx.pointer_type,
vtable_memflags(),
vtable,
(ty::COMMON_VTABLE_ENTRIES_SIZE * usize_size) as i32,
pub(crate) fn min_align_of_obj(fx: &mut FunctionCx<'_, '_, '_>, vtable: Value) -> Value {
let usize_size = fx.layout_of(fx.tcx.types.usize).size.bytes() as usize;
fx.bcx.ins().load(
- pointer_ty(fx.tcx),
+ fx.pointer_type,
vtable_memflags(),
vtable,
- (ty::COMMON_VTABLE_ENTRIES_SIZE * usize_size) as i32,
+ (ty::COMMON_VTABLE_ENTRIES_ALIGN * usize_size) as i32,
)
}
let usize_size = fx.layout_of(fx.tcx.types.usize).size.bytes();
let func_ref = fx.bcx.ins().load(
- pointer_ty(fx.tcx),
+ fx.pointer_type,
vtable_memflags(),
vtable,
(idx * usize_size as usize) as i32,
ty: Ty<'tcx>,
trait_ref: Option<ty::PolyExistentialTraitRef<'tcx>>,
) -> Value {
- let vtable_ptr = if let Some(vtable_ptr) = fx.vtables.get(&(ty, trait_ref)) {
- *vtable_ptr
- } else {
- let vtable_alloc_id = fx.tcx.vtable_allocation(ty, trait_ref);
- let vtable_allocation = fx.tcx.global_alloc(vtable_alloc_id).unwrap_memory();
- let vtable_ptr = pointer_for_allocation(fx, vtable_allocation);
-
- fx.vtables.insert((ty, trait_ref), vtable_ptr);
- vtable_ptr
- };
-
- vtable_ptr.get_addr(fx)
+ let alloc_id = fx.tcx.vtable_allocation((ty, trait_ref));
+ let data_id =
+ data_id_for_alloc_id(&mut fx.constants_cx, &mut *fx.module, alloc_id, Mutability::Not);
+ let local_data_id = fx.module.declare_data_in_func(data_id, &mut fx.bcx.func);
+ if fx.clif_comments.enabled() {
+ fx.add_comment(local_data_id, format!("vtable: {:?}", alloc_id));
+ }
+ fx.bcx.ins().global_value(fx.pointer_type, local_data_id)
}