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Fix an off-by-one in anyref stack manipulation

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With more than two anyref stack arguments we were accidentally storing
the anyref values one higher in the stack than intended, so fix this
off-by-one by switching up some addition logic.
This commit is contained in:
Alex Crichton
2019-08-01 11:58:23 -07:00
parent 6e3e9d2dae
commit 5aee2f9c6a
1 changed files with 2 additions and 2 deletions
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4
crates/anyref-xform/src/lib.rs
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@ -510,14 +510,14 @@ impl Transform<'_> {
// Store an anyref at an offset from our function's stack
// pointer frame.
let get_fp = builder.local_get(fp);
next_stack_offset += 1;
let (index, idx_local) = if next_stack_offset == 1 {
let (index, idx_local) = if next_stack_offset == 0 {
(get_fp, fp)
} else {
let rhs = builder.i32_const(next_stack_offset);
let add = builder.binop(BinaryOp::I32Add, get_fp, rhs);
(builder.local_tee(scratch_i32, add), scratch_i32)
};
next_stack_offset += 1;
let store = builder.table_set(self.table, index, local);
let get = builder.local_get(idx_local);
builder.with_side_effects(vec![store], get, Vec::new())