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repl: implement string evaluation for 32-bit platforms

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Brian Carroll 2022-02-02 15:20:38 +00:00
parent 4994b0ef1b
commit 87886e2e6b
1 changed files with 6 additions and 6 deletions
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12
repl_eval/src/eval.rs
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@ -1282,15 +1282,15 @@ fn number_literal_to_ast<T: std::fmt::Display>(arena: &Bump, num: T) -> Expr<'_>
}
#[cfg(target_endian = "little")]
#[cfg(target_pointer_width = "64")]
/// TODO implement this for 32-bit and big-endian targets. NOTE: As of this writing,
/// we don't have big-endian small strings implemented yet!
/// NOTE: As of this writing, we don't have big-endian small strings implemented yet!
fn str_to_ast<'a>(arena: &'a Bump, string: &'a str) -> Expr<'a> {
let bytes: [u8; 16] = unsafe { std::mem::transmute::<&'a str, [u8; 16]>(string) };
let is_small = (bytes[15] & 0b1000_0000) != 0;
const STR_SIZE: usize = 2 * std::mem::size_of::<usize>();
let bytes: [u8; STR_SIZE] = unsafe { std::mem::transmute(string) };
let is_small = (bytes[STR_SIZE - 1] & 0b1000_0000) != 0;
if is_small {
let len = (bytes[15] & 0b0111_1111) as usize;
let len = (bytes[STR_SIZE - 1] & 0b0111_1111) as usize;
let mut string = bumpalo::collections::String::with_capacity_in(len, arena);
for byte in bytes.iter().take(len) {