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Change round_up_to_alignment to a macro to work on more Rust types

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This commit is contained in:
Brian Carroll 2021-12-08 21:11:10 +00:00
parent 6a801ebc7e
commit 1ba654c5b2
4 changed files with 20 additions and 18 deletions
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31
compiler/gen_wasm/src/lib.rs
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@ -175,20 +175,23 @@ pub fn copy_memory(code_builder: &mut CodeBuilder, config: CopyMemoryConfig) {
}
/// Round up to alignment_bytes (which must be a power of 2)
pub fn round_up_to_alignment(unaligned: i32, alignment_bytes: i32) -> i32 {
if alignment_bytes <= 1 {
return unaligned;
}
if alignment_bytes.count_ones() != 1 {
panic!(
"Cannot align to {} bytes. Not a power of 2.",
alignment_bytes
);
}
let mut aligned = unaligned;
aligned += alignment_bytes - 1; // if lower bits are non-zero, push it over the next boundary
aligned &= -alignment_bytes; // mask with a flag that has upper bits 1, lower bits 0
aligned
#[macro_export]
macro_rules! round_up_to_alignment {
($unaligned: expr, $alignment_bytes: expr) => {
if $alignment_bytes <= 1 {
$unaligned
} else if $alignment_bytes.count_ones() != 1 {
panic!(
"Cannot align to {} bytes. Not a power of 2.",
$alignment_bytes
);
} else {
let mut aligned = $unaligned;
aligned += $alignment_bytes - 1; // if lower bits are non-zero, push it over the next boundary
aligned &= !$alignment_bytes + 1; // mask with a flag that has upper bits 1, lower bits 0
aligned
}
};
}
pub fn debug_panic<E: std::fmt::Debug>(error: E) {