bjoernager/rust
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Add a pointer to address cast kind

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A pointer to address cast are often special-cased.
Introduce a dedicated cast kind to make them easy distinguishable.
This commit is contained in:
Tomasz Miąsko 2022-05-31 00:00:00 +00:00
parent d35d972e69
commit dff602fc18
15 changed files with 96 additions and 94 deletions
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10
compiler/rustc_codegen_ssa/src/mir/rvalue.rs
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@ -181,6 +181,13 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
let cast = bx.cx().layout_of(self.monomorphize(mir_cast_ty));
let val = match *kind {
mir::CastKind::PointerAddress => {
assert!(bx.cx().is_backend_immediate(cast));
let llptr = operand.immediate();
let llcast_ty = bx.cx().immediate_backend_type(cast);
let lladdr = bx.ptrtoint(llptr, llcast_ty);
OperandValue::Immediate(lladdr)
}
mir::CastKind::Pointer(PointerCast::ReifyFnPointer) => {
match *operand.layout.ty.kind() {
ty::FnDef(def_id, substs) => {
@ -362,9 +369,6 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
(CastTy::Ptr(_) | CastTy::FnPtr, CastTy::Ptr(_)) => {
bx.pointercast(llval, ll_t_out)
}
(CastTy::Ptr(_) | CastTy::FnPtr, CastTy::Int(_)) => {
bx.ptrtoint(llval, ll_t_out)
}
(CastTy::Int(_), CastTy::Ptr(_)) => {
let usize_llval = bx.intcast(llval, bx.cx().type_isize(), signed);
bx.inttoptr(usize_llval, ll_t_out)