winliner/
convert.rs

1//! Conversions from `wasmparser` types to `wasm-encoder` types.
2
3use anyhow::{bail, Result};
4
5pub fn const_expr_with_func_delta(
6    const_expr: wasmparser::ConstExpr,
7    func_delta: u32,
8) -> Result<wasm_encoder::ConstExpr> {
9    let mut ops = const_expr.get_operators_reader().into_iter();
10
11    let result = match ops.next() {
12        Some(Ok(wasmparser::Operator::I32Const { value })) => {
13            wasm_encoder::ConstExpr::i32_const(value)
14        }
15        Some(Ok(wasmparser::Operator::I64Const { value })) => {
16            wasm_encoder::ConstExpr::i64_const(value)
17        }
18        Some(Ok(wasmparser::Operator::F32Const { value })) => {
19            wasm_encoder::ConstExpr::f32_const(value.bits() as _)
20        }
21        Some(Ok(wasmparser::Operator::F64Const { value })) => {
22            wasm_encoder::ConstExpr::f64_const(value.bits() as _)
23        }
24        Some(Ok(wasmparser::Operator::V128Const { value })) => {
25            wasm_encoder::ConstExpr::v128_const(i128::from_le_bytes(*value.bytes()))
26        }
27        Some(Ok(wasmparser::Operator::RefNull { hty })) => {
28            wasm_encoder::ConstExpr::ref_null(hty.into())
29        }
30        Some(Ok(wasmparser::Operator::RefFunc { function_index })) => {
31            wasm_encoder::ConstExpr::ref_func(function_index + func_delta)
32        }
33        Some(Ok(wasmparser::Operator::GlobalGet { global_index })) => {
34            wasm_encoder::ConstExpr::global_get(global_index)
35        }
36
37        // TODO: support the extended-const proposal.
38        Some(Ok(op)) => bail!("invalid const expression: {op:?}"),
39
40        Some(Err(e)) => return Err(e.into()),
41        None => bail!("empty const expression is invalid"),
42    };
43
44    match (ops.next(), ops.next()) {
45        (Some(Ok(wasmparser::Operator::End)), None) => Ok(result),
46        _ => bail!("invalid const expression"),
47    }
48}
winliner/convert.rs

winliner/
convert.rs
