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check for staticness when incrementing

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Folkert 2021-04-14 16:36:34 +02:00
parent 5690794dc9
commit 6d941e242e
1 changed files with 19 additions and 6 deletions
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23
compiler/gen/src/llvm/refcounting.rs
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@ -119,19 +119,32 @@ impl<'ctx> PointerToRefcount<'ctx> {
let builder = env.builder;
let refcount_type = ptr_int(env.context, env.ptr_bytes);
let max = builder.build_int_compare(
let is_static_allocation = builder.build_int_compare(
IntPredicate::EQ,
refcount,
refcount_type.const_int(REFCOUNT_MAX as u64, false),
"refcount_max_check",
);
let block = env.builder.get_insert_block().expect("to be in a function");
let parent = block.get_parent().unwrap();
let modify_block = env.context.append_basic_block(parent, "inc_str_modify");
let cont_block = env.context.append_basic_block(parent, "inc_str_cont");
env.builder
.build_conditional_branch(is_static_allocation, cont_block, modify_block);
{
env.builder.position_at_end(modify_block);
let incremented = builder.build_int_add(refcount, amount, "increment_refcount");
self.set_refcount(env, incremented);
let new_refcount = builder
.build_select(max, refcount, incremented, "select_refcount")
.into_int_value();
env.builder.build_unconditional_branch(cont_block);
}
self.set_refcount(env, new_refcount);
env.builder.position_at_end(cont_block);
}
pub fn decrement<'a, 'env>(&self, env: &Env<'a, 'ctx, 'env>, layout: &Layout<'a>) {