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Wasm: adjust dead code elimination to account for import function indices

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This commit is contained in:
Brian Carroll 2022-01-12 09:31:00 +00:00
parent ca2597973e
commit 9dabc2db15
5 changed files with 124 additions and 61 deletions
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35
compiler/gen_wasm/src/wasm_module/serialize.rs
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@ -268,25 +268,27 @@ pub trait SkipBytes {
impl SkipBytes for u32 {
fn skip_bytes(bytes: &[u8], cursor: &mut usize) {
let imax = 5;
let mut i = *cursor;
while (bytes[i] & 0x80 != 0) && (i < imax) {
i += 1;
const MAX_LEN: usize = 5;
for (i, byte) in bytes.iter().enumerate().skip(*cursor).take(MAX_LEN) {
if byte & 0x80 == 0 {
*cursor = i + 1;
return;
}
}
debug_assert!(i < imax);
*cursor = i + 1
internal_error!("Invalid LEB encoding");
}
}
impl SkipBytes for u64 {
fn skip_bytes(bytes: &[u8], cursor: &mut usize) {
let imax = 10;
let mut i = *cursor;
while (bytes[i] & 0x80 != 0) && (i < imax) {
i += 1;
const MAX_LEN: usize = 10;
for (i, byte) in bytes.iter().enumerate().skip(*cursor).take(MAX_LEN) {
if byte & 0x80 == 0 {
*cursor = i + 1;
return;
}
}
debug_assert!(i < imax);
*cursor = i + 1
internal_error!("Invalid LEB encoding");
}
}
@ -299,6 +301,15 @@ impl SkipBytes for u8 {
impl SkipBytes for String {
fn skip_bytes(bytes: &[u8], cursor: &mut usize) {
let len = parse_u32_or_panic(bytes, cursor);
if false {
let str_bytes = &bytes[*cursor..(*cursor + len as usize)];
println!(
"Skipping String {:?}",
String::from_utf8(str_bytes.to_vec()).unwrap()
);
}
*cursor += len as usize;
}
}