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|
use crate::prelude::*;
use cranelift::codegen::ir::immediates::Offset32;
#[derive(Copy, Clone, Debug)]
pub struct Pointer {
base: PointerBase,
offset: Offset32,
}
#[derive(Copy, Clone, Debug)]
enum PointerBase {
Addr(Value),
Stack(StackSlot),
}
impl Pointer {
pub fn new(addr: Value) -> Self {
Pointer {
base: PointerBase::Addr(addr),
offset: Offset32::new(0),
}
}
pub fn stack_slot(stack_slot: StackSlot) -> Self {
Pointer {
base: PointerBase::Stack(stack_slot),
offset: Offset32::new(0),
}
}
pub fn const_addr<'a, 'tcx>(fx: &mut FunctionCx<'a, 'tcx, impl Backend>, addr: i64) -> Self {
let addr = fx.bcx.ins().iconst(fx.pointer_type, addr);
Pointer {
base: PointerBase::Addr(addr),
offset: Offset32::new(0),
}
}
pub fn get_addr<'a, 'tcx>(self, fx: &mut FunctionCx<'a, 'tcx, impl Backend>) -> Value {
match self.base {
PointerBase::Addr(base_addr) => {
let offset: i64 = self.offset.into();
if offset == 0 {
base_addr
} else {
fx.bcx.ins().iadd_imm(base_addr, offset)
}
}
PointerBase::Stack(stack_slot) => fx.bcx.ins().stack_addr(fx.pointer_type, stack_slot, self.offset),
}
}
pub fn try_get_addr_and_offset(self) -> Option<(Value, Offset32)> {
match self.base {
PointerBase::Addr(addr) => Some((addr, self.offset)),
PointerBase::Stack(_) => None,
}
}
pub fn offset<'a, 'tcx>(
self,
fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
extra_offset: Offset32,
) -> Self {
self.offset_i64(fx, extra_offset.into())
}
pub fn offset_i64<'a, 'tcx>(
self,
fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
extra_offset: i64,
) -> Self {
if let Some(new_offset) = self.offset.try_add_i64(extra_offset) {
Pointer {
base: self.base,
offset: new_offset,
}
} else {
let base_offset: i64 = self.offset.into();
if let Some(new_offset) = base_offset.checked_add(extra_offset){
let base_addr = match self.base {
PointerBase::Addr(addr) => addr,
PointerBase::Stack(stack_slot) => fx.bcx.ins().stack_addr(fx.pointer_type, stack_slot, 0),
};
let addr = fx.bcx.ins().iadd_imm(base_addr, new_offset);
Pointer {
base: PointerBase::Addr(addr),
offset: Offset32::new(0),
}
} else {
panic!("self.offset ({}) + extra_offset ({}) not representable in i64", base_offset, extra_offset);
}
}
}
pub fn offset_value<'a, 'tcx>(
self,
fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
extra_offset: Value,
) -> Self {
match self.base {
PointerBase::Addr(addr) => Pointer {
base: PointerBase::Addr(fx.bcx.ins().iadd(addr, extra_offset)),
offset: self.offset,
},
PointerBase::Stack(stack_slot) => {
let base_addr = fx.bcx.ins().stack_addr(fx.pointer_type, stack_slot, self.offset);
Pointer {
base: PointerBase::Addr(fx.bcx.ins().iadd(base_addr, extra_offset)),
offset: Offset32::new(0),
}
}
}
}
pub fn load<'a, 'tcx>(
self,
fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
ty: Type,
flags: MemFlags,
) -> Value {
match self.base {
PointerBase::Addr(base_addr) => fx.bcx.ins().load(ty, flags, base_addr, self.offset),
PointerBase::Stack(stack_slot) => if ty == types::I128 {
// WORKAROUND for stack_load.i128 not being implemented
let base_addr = fx.bcx.ins().stack_addr(fx.pointer_type, stack_slot, 0);
fx.bcx.ins().load(ty, flags, base_addr, self.offset)
} else {
fx.bcx.ins().stack_load(ty, stack_slot, self.offset)
}
}
}
pub fn store<'a, 'tcx>(
self,
fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
value: Value,
flags: MemFlags,
) {
match self.base {
PointerBase::Addr(base_addr) => {
fx.bcx.ins().store(flags, value, base_addr, self.offset);
}
PointerBase::Stack(stack_slot) => if fx.bcx.func.dfg.value_type(value) == types::I128 {
// WORKAROUND for stack_load.i128 not being implemented
let base_addr = fx.bcx.ins().stack_addr(fx.pointer_type, stack_slot, 0);
fx.bcx.ins().store(flags, value, base_addr, self.offset);
} else {
fx.bcx.ins().stack_store(value, stack_slot, self.offset);
}
}
}
}
|
