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Wasm: use parsed data from object file in the backend

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This commit is contained in:
Brian Carroll 2022-01-09 16:14:54 +00:00
parent 8a384ffa88
commit c8181c3a19
2 changed files with 21 additions and 6 deletions
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14
compiler/gen_wasm/src/lib.rs
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@ -92,8 +92,17 @@ pub fn build_module_help<'a>(
fn_index += 1;
}
// Pre-load the WasmModule with data from the platform & builtins object file
let initial_module = WasmModule::preload(env.arena, preload_bytes);
let main_function_index = maybe_main_fn_index.unwrap() + initial_module.code.preloaded_count;
// Adjust Wasm function indices to account for functions from the object file
let runtime_import_fn_count: u32 = initial_module.import.function_count(); // to be imported at runtime (e.g. WASI)
let fn_index_offset: u32 = runtime_import_fn_count + initial_module.code.preloaded_count;
// Get a map of name to index for the preloaded functions
// Assumes the preloaded object file has all symbols exported, as per `zig build-lib -dymamic`
let preloaded_functions_map: MutMap<&'a [u8], u32> =
initial_module.export.function_index_map(env.arena);
let mut backend = WasmBackend::new(
env,
@ -101,6 +110,8 @@ pub fn build_module_help<'a>(
layout_ids,
proc_symbols,
initial_module,
fn_index_offset,
preloaded_functions_map,
CodeGenHelp::new(env.arena, IntWidth::I32, env.module_id),
);
@ -137,6 +148,7 @@ pub fn build_module_help<'a>(
let module = backend.into_module();
let main_function_index = maybe_main_fn_index.unwrap() + fn_index_offset;
Ok((module, main_function_index))
}