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Implement pxbind fix for combo bit flags with partially unnamed bits #226

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Implement pxbind fix for combo bit flags with partially unnamed bits #226

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4058eec
Fix for bug when generating the combined bitflags
NiklasNummelin Jan 24, 2024
c8bba56
Missing OR :)
NiklasNummelin Jan 24, 2024
1a46720
Cargo fmt
NiklasNummelin Jan 24, 2024
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19 changes: 16 additions & 3 deletions physx-sys/pxbind/src/generator/enums.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -110,17 +110,24 @@ impl<'ast> crate::consumer::FlagsBinding<'ast> {
writes!(w, "1 << {}", val.ilog2());
} else {
let mut is_combo = false;
// If we're not a power of 2, we're a combination of flags,

// If we're not a power of 2, we're a combination of flags (or constants),
// find which ones and emit them in a friendly way
for (i, which) in enum_binding

// We keep track of what remaining flag(s) we have to mask into the bitmask
// by removing the bits that have been found as named flags.
let mut remainder = val;

for (i, (which, bit)) in enum_binding
.variants
.iter()
.filter_map(|var| {
let prev = var.value as u64;
(prev & (prev - 1) == 0 && (prev & val) != 0).then_some(var.name)
(prev & (prev - 1) == 0 && (prev & val) != 0).then_some((var.name, prev))
})
.enumerate()
{
remainder &= !bit;
is_combo = true;
if i > 0 {
writes!(w, " | ");
Expand All @@ -133,6 +140,12 @@ impl<'ast> crate::consumer::FlagsBinding<'ast> {
// emit the raw value
if !is_combo {
writes!(w, "0x{val:08x}");
} else if remainder != 0 {
if remainder & (remainder - 1) == 0 {
writes!(w, "| 1 << {}", remainder.ilog2());
} else {
writes!(w, "| 0x{remainder:08x}");
}
}
}

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