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wasm: use __data_end to account for all constant data including zero (bss) data

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Brian Carroll 2022-03-08 08:56:34 +00:00
parent 4d14fbf562
commit 9ae26c5aac
3 changed files with 67 additions and 34 deletions
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11
compiler/gen_wasm/src/wasm_module/serialize.rs
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@ -1,6 +1,6 @@
use std::{fmt::Debug, iter::FromIterator};
use bumpalo::collections::vec::Vec;
use bumpalo::{collections::vec::Vec, Bump};
use roc_error_macros::internal_error;
/// In the WebAssembly binary format, all integers are variable-length encoded (using LEB-128)
@ -262,6 +262,15 @@ pub fn parse_u32_or_panic(bytes: &[u8], cursor: &mut usize) -> u32 {
value
}
pub fn parse_string_bytes<'a>(arena: &'a Bump, bytes: &[u8], cursor: &mut usize) -> &'a [u8] {
let len = parse_u32_or_panic(bytes, cursor);
let end = *cursor + len as usize;
let bytes: &[u8] = &bytes[*cursor..end];
let copy = arena.alloc_slice_copy(bytes);
*cursor = end;
copy
}
/// Skip over serialized bytes for a type
/// This may, or may not, require looking at the byte values
pub trait SkipBytes {