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mono: Update Str refcount helpers to account for capacity field

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Brian Carroll 2022-03-11 08:18:53 +00:00
parent a9e0ff6b4b
commit e4829b5b85
1 changed files with 9 additions and 9 deletions
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18
compiler/mono/src/code_gen_help/refcount.rs
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@ -345,29 +345,29 @@ fn refcount_str<'a>(
let string = Symbol::ARG_1;
let layout_isize = root.layout_isize;
// Get the string length as a signed int
let len = root.create_symbol(ident_ids, "len");
let len_expr = Expr::StructAtIndex {
index: 1,
// Get the last word as a signed int
let last_word = root.create_symbol(ident_ids, "last_word");
let last_word_expr = Expr::StructAtIndex {
index: 2,
field_layouts: root.arena.alloc([LAYOUT_PTR, layout_isize]),
structure: string,
};
let len_stmt = |next| Stmt::Let(len, len_expr, layout_isize, next);
let last_word_stmt = |next| Stmt::Let(last_word, last_word_expr, layout_isize, next);
// Zero
let zero = root.create_symbol(ident_ids, "zero");
let zero_expr = Expr::Literal(Literal::Int(0));
let zero_stmt = |next| Stmt::Let(zero, zero_expr, layout_isize, next);
// is_big_str = (len >= 0);
// Treat len as isize so that the small string flag is the same as the sign bit
// is_big_str = (last_word >= 0);
// Treat last word as isize so that the small string flag is the same as the sign bit
let is_big_str = root.create_symbol(ident_ids, "is_big_str");
let is_big_str_expr = Expr::Call(Call {
call_type: CallType::LowLevel {
op: LowLevel::NumGte,
update_mode: UpdateModeId::BACKEND_DUMMY,
},
arguments: root.arena.alloc([len, zero]),
arguments: root.arena.alloc([last_word, zero]),
});
let is_big_str_stmt = |next| Stmt::Let(is_big_str, is_big_str_expr, LAYOUT_BOOL, next);
@ -422,7 +422,7 @@ fn refcount_str<'a>(
};
// Combine the statements in sequence
len_stmt(root.arena.alloc(
last_word_stmt(root.arena.alloc(
//
zero_stmt(root.arena.alloc(
//