3 use rustc_target::abi::Align;
5 use cranelift_codegen::ir::immediates::Offset32;
7 #[derive(Copy, Clone, Debug)]
8 pub(crate) struct Pointer {
13 #[derive(Copy, Clone, Debug)]
14 pub(crate) enum PointerBase {
21 pub(crate) fn new(addr: Value) -> Self {
23 base: PointerBase::Addr(addr),
24 offset: Offset32::new(0),
28 pub(crate) fn stack_slot(stack_slot: StackSlot) -> Self {
30 base: PointerBase::Stack(stack_slot),
31 offset: Offset32::new(0),
35 pub(crate) fn const_addr<'a, 'tcx>(
36 fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
39 let addr = fx.bcx.ins().iconst(fx.pointer_type, addr);
41 base: PointerBase::Addr(addr),
42 offset: Offset32::new(0),
46 pub(crate) fn dangling(align: Align) -> Self {
48 base: PointerBase::Dangling(align),
49 offset: Offset32::new(0),
53 #[cfg(debug_assertions)]
54 pub(crate) fn base_and_offset(self) -> (PointerBase, Offset32) {
55 (self.base, self.offset)
58 pub(crate) fn get_addr<'a, 'tcx>(self, fx: &mut FunctionCx<'a, 'tcx, impl Backend>) -> Value {
60 PointerBase::Addr(base_addr) => {
61 let offset: i64 = self.offset.into();
65 fx.bcx.ins().iadd_imm(base_addr, offset)
68 PointerBase::Stack(stack_slot) => {
71 .stack_addr(fx.pointer_type, stack_slot, self.offset)
73 PointerBase::Dangling(align) => fx
76 .iconst(fx.pointer_type, i64::try_from(align.bytes()).unwrap()),
80 pub(crate) fn offset<'a, 'tcx>(
82 fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
83 extra_offset: Offset32,
85 self.offset_i64(fx, extra_offset.into())
88 pub(crate) fn offset_i64<'a, 'tcx>(
90 fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
93 if let Some(new_offset) = self.offset.try_add_i64(extra_offset) {
99 let base_offset: i64 = self.offset.into();
100 if let Some(new_offset) = base_offset.checked_add(extra_offset) {
101 let base_addr = match self.base {
102 PointerBase::Addr(addr) => addr,
103 PointerBase::Stack(stack_slot) => {
104 fx.bcx.ins().stack_addr(fx.pointer_type, stack_slot, 0)
106 PointerBase::Dangling(align) => fx
109 .iconst(fx.pointer_type, i64::try_from(align.bytes()).unwrap()),
111 let addr = fx.bcx.ins().iadd_imm(base_addr, new_offset);
113 base: PointerBase::Addr(addr),
114 offset: Offset32::new(0),
118 "self.offset ({}) + extra_offset ({}) not representable in i64",
119 base_offset, extra_offset
125 pub(crate) fn offset_value<'a, 'tcx>(
127 fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
131 PointerBase::Addr(addr) => Pointer {
132 base: PointerBase::Addr(fx.bcx.ins().iadd(addr, extra_offset)),
135 PointerBase::Stack(stack_slot) => {
139 .stack_addr(fx.pointer_type, stack_slot, self.offset);
141 base: PointerBase::Addr(fx.bcx.ins().iadd(base_addr, extra_offset)),
142 offset: Offset32::new(0),
145 PointerBase::Dangling(align) => {
149 .iconst(fx.pointer_type, i64::try_from(align.bytes()).unwrap());
151 base: PointerBase::Addr(fx.bcx.ins().iadd(addr, extra_offset)),
158 pub(crate) fn load<'a, 'tcx>(
160 fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
165 PointerBase::Addr(base_addr) => fx.bcx.ins().load(ty, flags, base_addr, self.offset),
166 PointerBase::Stack(stack_slot) => {
167 if ty == types::I128 || ty.is_vector() {
168 // WORKAROUND for stack_load.i128 and stack_load.iXxY not being implemented
169 let base_addr = fx.bcx.ins().stack_addr(fx.pointer_type, stack_slot, 0);
170 fx.bcx.ins().load(ty, flags, base_addr, self.offset)
172 fx.bcx.ins().stack_load(ty, stack_slot, self.offset)
175 PointerBase::Dangling(_align) => unreachable!(),
179 pub(crate) fn store<'a, 'tcx>(
181 fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
186 PointerBase::Addr(base_addr) => {
187 fx.bcx.ins().store(flags, value, base_addr, self.offset);
189 PointerBase::Stack(stack_slot) => {
190 let val_ty = fx.bcx.func.dfg.value_type(value);
191 if val_ty == types::I128 || val_ty.is_vector() {
192 // WORKAROUND for stack_store.i128 and stack_store.iXxY not being implemented
193 let base_addr = fx.bcx.ins().stack_addr(fx.pointer_type, stack_slot, 0);
194 fx.bcx.ins().store(flags, value, base_addr, self.offset);
196 fx.bcx.ins().stack_store(value, stack_slot, self.offset);
199 PointerBase::Dangling(_align) => unreachable!(),