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wasm_module, wasm_interp: fix SLEB-128 encoding for i64

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Brian Carroll 2022-11-28 17:39:13 +00:00
parent 0dc3441301
commit 9ea2176db8
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GPG key ID: 5C7B2EC4101703C0
2 changed files with 2 additions and 5 deletions
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3
crates/wasm_interp/tests/test_i64.rs
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@ -276,21 +276,18 @@ fn test_i64shl() {
}
#[test]
#[ignore] // TODO: i64.const is encoding the wrong LEB bytes
fn test_i64shrs() {
test_u64_binop(I64SHRS, 0xffff_ffff_0000_0000, 8, 0xffff_ffff_ff00_0000);
test_u64_binop(I64SHRS, 0xffff_ffff_0000_0000, 72, 0xffff_ffff_ff00_0000);
}
#[test]
#[ignore] // TODO: i64.const is encoding the wrong LEB bytes
fn test_i64shru() {
test_u64_binop(I64SHRU, 0xffff_ffff_0000_0000, 8, 0x00ff_ffff_ff00_0000);
test_u64_binop(I64SHRU, 0xffff_ffff_0000_0000, 72, 0x00ff_ffff_ff00_0000);
}
#[test]
#[ignore] // TODO: i64.const is encoding the wrong LEB bytes
fn test_i64rotl() {
test_u64_binop(I64ROTL, 0xff00_0000_0000_0000, 4, 0xf000_0000_0000_000f);
test_u64_binop(I64ROTL, 0xff00_0000_0000_0000, 68, 0xf000_0000_0000_000f);

4
crates/wasm_module/src/parse.rs
View file

@ -99,14 +99,14 @@ fn decode_i64(bytes: &[u8]) -> Result<(i64, usize), ()> {
let mut shift = 0;
for (i, byte) in bytes.iter().take(MAX_SIZE_ENCODED_U64).enumerate() {
value |= ((byte & 0x7f) as i64) << shift;
shift += 7;
if (byte & 0x80) == 0 {
let is_negative = byte & 0x40 != 0;
if shift < MAX_SIZE_ENCODED_U64 && is_negative {
if shift < 64 && is_negative {
value |= -1 << shift;
}
return Ok((value, i + 1));
}
shift += 7;
}
Err(())
}