AbleOS/holey-bytes
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properly handling cases when stack is referenced by dofferent part of the memory

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Jakub Doka 2024-10-28 18:53:36 +01:00
parent b4b3bae104
commit be828b8c54
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GPG key ID: C6E9A89936B8C143
1 changed files with 31 additions and 6 deletions
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37
lang/src/son.rs
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@ -1993,7 +1993,32 @@ impl<'a> Codegen<'a> {
);
debug_assert!(self.ci.nodes[region].kind != Kind::Stre);
let index = self.aclass_index(region);
let (value_index, value_region) = self.aclass_index(value);
if value_index != 0 {
// simply switch the class to the default one
let aclass = &mut self.ci.scope.aclasses[value_index];
let loads = mem::take(&mut aclass.loads);
self.ci.nodes.load_loop_aclass(value_index, aclass, &mut self.ci.loops);
let last_store = aclass.last_store.get();
let mut cursor = last_store;
let mut first_store = cursor;
while cursor != MEM {
first_store = cursor;
cursor = self.ci.nodes[cursor].inputs[3];
}
if last_store != MEM {
let base_class = self.ci.scope.aclasses[0].last_store.get();
if base_class != MEM {
self.ci.nodes.modify_input(first_store, 3, base_class);
}
self.ci.scope.aclasses[0].last_store.set(last_store, &mut self.ci.nodes);
}
self.ci.scope.aclasses[0].loads.extend(loads);
self.ci.nodes[value_region].aclass = 0;
}
let (index, _) = self.aclass_index(region);
let aclass = &mut self.ci.scope.aclasses[index];
self.ci.nodes.load_loop_aclass(index, aclass, &mut self.ci.loops);
let mut vc = Vc::from([VOID, value, region, aclass.last_store.get()]);
@ -2027,7 +2052,7 @@ impl<'a> Codegen<'a> {
self.ty_display(self.ci.nodes[region].ty)
);
debug_assert!(self.ci.nodes[region].kind != Kind::Stre);
let index = self.aclass_index(region);
let (index, _) = self.aclass_index(region);
let aclass = &mut self.ci.scope.aclasses[index];
self.ci.nodes.load_loop_aclass(index, aclass, &mut self.ci.loops);
let vc = [VOID, region, aclass.last_store.get()];
@ -2036,7 +2061,7 @@ impl<'a> Codegen<'a> {
load
}
pub fn aclass_index(&mut self, mut region: Nid) -> usize {
pub fn aclass_index(&mut self, mut region: Nid) -> (usize, Nid) {
loop {
region = match self.ci.nodes[region].kind {
Kind::BinOp { op: TokenKind::Add | TokenKind::Sub } => {
@ -2046,7 +2071,7 @@ impl<'a> Codegen<'a> {
debug_assert_eq!(self.ci.nodes[region].inputs[2], 0);
self.ci.nodes[region].inputs[1]
}
_ => break self.ci.nodes[region].aclass,
_ => break (self.ci.nodes[region].aclass, region),
};
}
}
@ -2542,7 +2567,7 @@ impl<'a> Codegen<'a> {
for arg in args {
let value = self.expr(arg)?;
if let Some(base) = self.tys.base_of(value.ty) {
clobbered_aliases.push(self.aclass_index(value.id));
clobbered_aliases.push(self.aclass_index(value.id).0);
if base.has_pointers(self.tys) {
clobbered_aliases.push(0);
}
@ -2649,7 +2674,7 @@ impl<'a> Codegen<'a> {
self.assert_ty(arg.pos(), &mut value, ty, fa!("argument {}", carg.name));
if let Some(base) = self.tys.base_of(value.ty) {
clobbered_aliases.push(self.aclass_index(value.id));
clobbered_aliases.push(self.aclass_index(value.id).0);
if base.has_pointers(self.tys) {
clobbered_aliases.push(0);
}