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sparc64: fix crash in ABI code for { f64, f32 } struct

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This would trigger a `Size::sub: 0 - 8 would result in negative size` abort,
if `data.last_offset > offset`.

This is almost hilariously easy to trigger (https://godbolt.org/z/8rbv57xET):

```rust
#[repr(C)]
pub struct DoubleFloat {
    f: f64,
    g: f32,
}

#[no_mangle]
pub extern "C" fn foo(x: DoubleFloat) {}
```

Tests for this will be covered by the cast-target-abi.rs test added in a later commit.
This commit is contained in:
Erik Desjardins 2024-03-17 00:11:54 -04:00
parent 4498cd6a8d
commit 41c6fa812b
1 changed files with 8 additions and 6 deletions
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14
compiler/rustc_target/src/abi/call/sparc64.rs
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@ -35,12 +35,14 @@ where
data.last_offset = data.last_offset + Reg::i32().size;
}
for _ in 0..((offset - data.last_offset).bits() / 64)
.min((data.prefix.len() - data.prefix_index) as u64)
{
data.prefix[data.prefix_index] = Some(Reg::i64());
data.prefix_index += 1;
data.last_offset = data.last_offset + Reg::i64().size;
if data.last_offset < offset {
for _ in 0..((offset - data.last_offset).bits() / 64)
.min((data.prefix.len() - data.prefix_index) as u64)
{
data.prefix[data.prefix_index] = Some(Reg::i64());
data.prefix_index += 1;
data.last_offset = data.last_offset + Reg::i64().size;
}
}
if data.last_offset < offset {