mirror of
https://github.com/fluencelabs/wasm-bindgen
synced 2025-03-17 02:30:50 +00:00
Add an option to "uglify" imports
This commit adds an option to "uglify" the wasm module's imports/exports so those which are controlled by bindgen are renamed to a shorter (probably one letter) names. This'll hopefully help cut down on both the wasm size slightly and also the generated JS as the glue we're talking to wasm over won't require such large names all the time.
This commit is contained in:
Alex Crichton
parent
240d3cd1a1
commit
bef908a9b1
@ -15,6 +15,7 @@ thread_local!(static IDX: usize = CNT.fetch_add(1, Ordering::SeqCst));
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pub struct Project {
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files: Vec<(String, String)>,
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debug: bool,
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uglify: bool,
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}
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pub fn project() -> Project {
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@ -27,6 +28,7 @@ pub fn project() -> Project {
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.read_to_string(&mut lockfile).unwrap();
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Project {
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debug: true,
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uglify: false,
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files: vec![
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("Cargo.toml".to_string(), format!(r#"
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[package]
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@ -125,6 +127,11 @@ impl Project {
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self
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}
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pub fn uglify(&mut self, uglify: bool) -> &mut Project {
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self.uglify = uglify;
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self
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}
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pub fn test(&mut self) {
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let root = root();
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drop(fs::remove_dir_all(&root));
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@ -159,6 +166,7 @@ impl Project {
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.input_path(&out)
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.nodejs(true)
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.debug(self.debug)
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.uglify_wasm_names(self.uglify)
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.generate()
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.expect("failed to run bindgen");
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obj.write_ts_to(root.join("out.ts")).expect("failed to write ts");
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@ -4,23 +4,28 @@ extern crate parity_wasm;
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extern crate wasm_bindgen_shared as shared;
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extern crate serde_json;
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use std::path::{Path, PathBuf};
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use std::collections::HashMap;
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use std::fs::File;
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use std::io::Write;
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use std::path::{Path, PathBuf};
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use failure::{Error, ResultExt};
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use parity_wasm::elements::*;
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mod ts;
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mod mapped;
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use mapped::Mapped;
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pub struct Bindgen {
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path: Option<PathBuf>,
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nodejs: bool,
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debug: bool,
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uglify: bool,
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}
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pub struct Object {
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module: Module,
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module: Mapped,
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program: shared::Program,
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nodejs: bool,
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debug: bool,
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@ -32,6 +37,7 @@ impl Bindgen {
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path: None,
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nodejs: false,
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debug: false,
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uglify: false,
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}
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}
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@ -50,6 +56,11 @@ impl Bindgen {
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self
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}
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pub fn uglify_wasm_names(&mut self, uglify: bool) -> &mut Bindgen {
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self.uglify = uglify;
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self
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}
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pub fn generate(&mut self) -> Result<Object, Error> {
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let input = match self.path {
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Some(ref path) => path,
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@ -59,8 +70,16 @@ impl Bindgen {
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format_err!("{:?}", e)
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})?;
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let program = extract_program(&mut module);
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Ok(Object {
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let mut mapped = Mapped {
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module,
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imports: HashMap::new(),
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exports: HashMap::new(),
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};
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if self.uglify {
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mapped.uglify(&program);
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}
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Ok(Object {
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module: mapped,
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program,
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nodejs: self.nodejs,
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debug: self.debug,
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@ -89,7 +108,7 @@ impl Object {
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}
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fn _write_wasm_to(self, path: &Path) -> Result<(), Error> {
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parity_wasm::serialize_to_file(path, self.module).map_err(|e| {
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parity_wasm::serialize_to_file(path, self.module.module).map_err(|e| {
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format_err!("{:?}", e)
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})?;
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Ok(())
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118
crates/wasm-bindgen-cli-support/src/mapped.rs
Normal file
118
crates/wasm-bindgen-cli-support/src/mapped.rs
Normal file
@ -0,0 +1,118 @@
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use std::collections::hash_map::{HashMap, Entry};
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use parity_wasm::elements::*;
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use shared;
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pub struct Mapped {
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pub module: Module,
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pub imports: HashMap<String, String>,
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pub exports: HashMap<String, String>,
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}
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impl Mapped {
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pub fn export_name<'a>(&'a self, name: &'a str) -> &'a str {
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self.exports.get(name).map(|s| &**s).unwrap_or(name)
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}
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pub fn orig_export_name<'a>(&'a self, name: &'a str) -> &'a str {
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self.exports.iter()
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.find(|&(_k, v)| name == v)
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.map(|p| &**p.0)
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.unwrap_or(name)
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}
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pub fn import_name<'a>(&'a self, name: &'a str) -> &'a str {
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self.imports.get(name).map(|s| &**s).unwrap_or(name)
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}
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pub fn orig_import_name<'a>(&'a self, name: &'a str) -> &'a str {
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self.imports.iter()
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.find(|&(_k, v)| name == v)
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.map(|p| &**p.0)
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.unwrap_or(name)
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}
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pub fn uglify(&mut self, program: &shared::Program) {
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let mut i = 0;
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let mut generate = || {
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let ret = generate(i);
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i += 1;
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return ret
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};
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for import in program.imports.iter() {
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self.imports.insert(import.name.clone(), generate());
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}
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for f in program.free_functions.iter() {
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self.exports.insert(f.free_function_export_name(), generate());
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}
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for s in program.structs.iter() {
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for f in s.functions.iter() {
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self.exports.insert(f.struct_function_export_name(&s.name),
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generate());
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}
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for f in s.methods.iter() {
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self.exports.insert(f.function.struct_function_export_name(&s.name),
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generate());
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}
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}
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for section in self.module.sections_mut() {
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match *section {
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Section::Import(ref mut section) => {
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for import in section.entries_mut() {
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let new_name = match self.imports.entry(import.field().to_string()) {
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Entry::Occupied(n) => n.into_mut(),
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Entry::Vacant(v) => {
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if !import.field().starts_with("__wbindgen") {
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continue
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}
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v.insert(generate())
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}
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};
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*import = ImportEntry::new(
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import.module().to_string(),
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new_name.to_string(),
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import.external().clone(),
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);
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}
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}
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Section::Export(ref mut e) => {
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for e in e.entries_mut() {
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let new_name = match self.exports.entry(e.field().to_string()) {
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Entry::Occupied(n) => n.into_mut(),
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Entry::Vacant(v) => {
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if !e.field().starts_with("__wbindgen") {
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continue
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}
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v.insert(generate())
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}
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};
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*e = ExportEntry::new(new_name.to_string(),
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e.internal().clone());
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}
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}
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_ => {}
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}
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}
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}
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}
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fn generate(mut i: usize) -> String {
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const LETTERS: &str = "\
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abcdefghijklmnopqrstuvwxyz\
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ABCDEFGHIJKLMNOPQRSTUVWXYZ\
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";
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let mut ret = String::new();
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loop {
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let j = i % LETTERS.len();
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i /= LETTERS.len();
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ret.push(LETTERS.as_bytes()[j] as char);
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if i == 0 {
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break
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}
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}
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return ret;
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}
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@ -3,6 +3,8 @@ use std::collections::{HashSet, HashMap};
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use shared;
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use parity_wasm::elements::*;
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use super::Mapped;
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#[derive(Default)]
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pub struct Js {
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globals: String,
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@ -18,27 +20,32 @@ impl Js {
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pub fn generate_program(&mut self,
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program: &shared::Program,
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_wasm: &Module) {
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m: &Mapped) {
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for f in program.free_functions.iter() {
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self.generate_free_function(f);
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self.generate_free_function(f, m);
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}
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for s in program.structs.iter() {
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self.generate_struct(s);
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self.generate_struct(s, m);
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}
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}
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pub fn generate_free_function(&mut self, func: &shared::Function) {
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pub fn generate_free_function(&mut self,
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func: &shared::Function,
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m: &Mapped) {
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let (js, ts) = self.generate_function("function",
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&func.name,
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&func.name,
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false,
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&func.arguments,
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func.ret.as_ref());
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func.ret.as_ref(),
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m);
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self.exports.push((func.name.clone(), js, ts));
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}
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pub fn generate_struct(&mut self, s: &shared::Struct) {
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pub fn generate_struct(&mut self,
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s: &shared::Struct,
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m: &Mapped) {
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let mut dst = String::new();
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self.expose_wasm_exports();
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dst.push_str(&format!("
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@ -63,7 +70,7 @@ impl Js {
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this.ptr = 0;
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wasm_exports.{}(ptr);
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}}
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", s.free_function()));
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", m.export_name(&s.free_function())));
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self.wasm_exports_bound.insert(s.name.clone());
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@ -75,6 +82,7 @@ impl Js {
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false,
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&function.arguments,
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function.ret.as_ref(),
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m,
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);
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dst.push_str(&js);
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dst.push_str("\n");
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@ -87,6 +95,7 @@ impl Js {
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true,
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&method.function.arguments,
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method.function.ret.as_ref(),
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m,
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);
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dst.push_str(&js);
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dst.push_str("\n");
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@ -104,7 +113,8 @@ impl Js {
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wasm_name: &str,
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is_method: bool,
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arguments: &[shared::Type],
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ret: Option<&shared::Type>) -> (String, String) {
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ret: Option<&shared::Type>,
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m: &Mapped) -> (String, String) {
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let mut dst = format!("{}(", name);
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let mut passed_args = String::new();
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let mut arg_conversions = String::new();
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@ -151,7 +161,7 @@ impl Js {
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shared::Type::BorrowedStr |
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shared::Type::String => {
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dst.push_str("string");
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self.expose_pass_string_to_wasm();
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self.expose_pass_string_to_wasm(m);
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arg_conversions.push_str(&format!("\
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const [ptr{i}, len{i}] = passStringToWasm({arg});
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", i = i, arg = name));
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@ -160,8 +170,8 @@ impl Js {
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if let shared::Type::BorrowedStr = *arg {
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self.expose_wasm_exports();
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destructors.push_str(&format!("\n\
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wasm_exports.__wbindgen_free(ptr{i}, len{i});\n\
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", i = i));
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wasm_exports.{free}(ptr{i}, len{i});\n\
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", i = i, free = m.export_name("__wbindgen_free")));
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}
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}
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shared::Type::ByRef(ref s) |
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@ -203,7 +213,7 @@ impl Js {
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arg_conversions.push_str(&format!("\
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const idx{i} = addBorrowedObject({arg});
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", i = i, arg = name));
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destructors.push_str("popBorrowedObject();\n");
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destructors.push_str("stack.pop();\n");
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pass(&format!("idx{}", i));
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}
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}
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@ -248,12 +258,16 @@ impl Js {
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self.expose_get_string_from_wasm();
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self.expose_wasm_exports();
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format!("
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const ptr = wasm_exports.__wbindgen_boxed_str_ptr(ret);
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const len = wasm_exports.__wbindgen_boxed_str_len(ret);
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const ptr = wasm_exports.{}(ret);
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const len = wasm_exports.{}(ret);
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const realRet = getStringFromWasm(ptr, len);
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wasm_exports.__wbindgen_boxed_str_free(ret);
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wasm_exports.{}(ret);
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return realRet;
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")
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",
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m.export_name("__wbindgen_boxed_str_ptr"),
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m.export_name("__wbindgen_boxed_str_len"),
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m.export_name("__wbindgen_boxed_str_free"),
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)
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}
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};
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let mut dst_ts = dst.clone();
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@ -265,7 +279,11 @@ impl Js {
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dst.push_str(&format!("\
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const ret = wasm_exports.{f}({passed});
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{convert_ret}
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", f = wasm_name, passed = passed_args, convert_ret = convert_ret));
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",
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f = m.export_name(wasm_name),
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passed = passed_args,
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convert_ret = convert_ret,
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));
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} else {
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dst.push_str(&format!("\
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try {{
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@ -274,8 +292,12 @@ impl Js {
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}} finally {{
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{destructors}
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}}
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", f = wasm_name, passed = passed_args, destructors = destructors,
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convert_ret = convert_ret));
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",
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f = m.export_name(wasm_name),
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passed = passed_args,
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destructors = destructors,
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convert_ret = convert_ret,
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));
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}
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dst.push_str("}");
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self.wasm_exports_bound.insert(wasm_name.to_string());
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@ -374,7 +396,7 @@ impl Js {
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(dst, ts_dst)
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}
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pub fn to_string(&mut self, m: &Module, program: &shared::Program) -> String {
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pub fn to_string(&mut self, m: &Mapped, program: &shared::Program) -> String {
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if self.debug {
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self.expose_global_slab();
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self.expose_global_stack();
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@ -398,7 +420,7 @@ impl Js {
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self.globals.push_str(class);
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self.globals.push_str("\n");
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}
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let wasm_exports = self.typescript_wasm_exports(m);
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let wasm_exports = self.typescript_wasm_exports(&m.module);
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let mut exports_interface = String::new();
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let mut extra_exports_interface = String::new();
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let mut exports = format!("\
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@ -419,14 +441,16 @@ impl Js {
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// well.
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for (export, typescript) in wasm_exports.iter() {
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// ignore any internal functions we have for ourselves
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if export.starts_with("__wbindgen") {
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let orig_export = m.orig_export_name(export);
|
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if orig_export.starts_with("__wbindgen") {
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continue
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}
|
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// Ignore anything we just bound above,
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if self.wasm_exports_bound.contains(export) {
|
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if self.wasm_exports_bound.contains(orig_export) {
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continue
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}
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|
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assert_eq!(orig_export, export);
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if extra_exports_interface.len() == 0 {
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extra_exports_interface.push_str("export interface ExtraExports {\n");
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exports_interface.push_str("extra: ExtraExports;\n");
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@ -445,7 +469,7 @@ impl Js {
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exports.push_str("},\n");
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}
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exports.push_str("}");
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let wasm_imports = self.typescript_wasm_imports(m);
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let wasm_imports = self.typescript_wasm_imports(&m.module);
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|
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let mut imports_object = String::new();
|
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let mut extra_imports_interface = String::new();
|
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@ -456,12 +480,13 @@ impl Js {
|
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// the wasm module, an optimization pass at some point may have
|
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// ended up removing the code that needed the import, removing the
|
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// import.
|
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if !wasm_imports.contains_key(&import.name) {
|
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let name = m.import_name(&import.name);
|
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if !wasm_imports.contains_key(name) {
|
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continue
|
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}
|
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imports_bound.insert(import.name.clone());
|
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imports_bound.insert(name.to_string());
|
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let (val, ts) = self.generate_import(import);
|
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imports_object.push_str(&import.name);
|
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imports_object.push_str(&name);
|
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imports_object.push_str(":");
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imports_object.push_str(&val);
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imports_object.push_str(",\n");
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@ -474,7 +499,8 @@ impl Js {
|
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// well.
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for (import, typescript) in wasm_imports.iter() {
|
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// ignore any internal functions we have for ourselves
|
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if import.starts_with("__wbindgen") {
|
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let orig_import = m.orig_import_name(import);
|
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if orig_import.starts_with("__wbindgen") {
|
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continue
|
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}
|
||||
// Ignore anything we just bound above,
|
||||
@ -482,6 +508,7 @@ impl Js {
|
||||
continue
|
||||
}
|
||||
|
||||
assert_eq!(orig_import, import);
|
||||
if extra_imports_interface.len() == 0 {
|
||||
extra_imports_interface.push_str("export interface ExtraImports {\n");
|
||||
imports_interface.push_str("env: ExtraImports;\n");
|
||||
@ -511,7 +538,7 @@ impl Js {
|
||||
String::from("(val as {cnt:number}).cnt += 1;")
|
||||
};
|
||||
imports_object.push_str(&format!("
|
||||
__wbindgen_object_clone_ref: function(idx: number): number {{
|
||||
{}: function(idx: number): number {{
|
||||
// If this object is on the stack promote it to the heap.
|
||||
if ((idx & 1) === 1)
|
||||
return addHeapObject(getObject(idx));
|
||||
@ -522,19 +549,24 @@ impl Js {
|
||||
{}
|
||||
return idx;
|
||||
}},
|
||||
", bump_cnt));
|
||||
", m.import_name("__wbindgen_object_clone_ref"), bump_cnt));
|
||||
}
|
||||
|
||||
if self.wasm_import_needed("__wbindgen_object_drop_ref", m) {
|
||||
self.expose_drop_ref();
|
||||
imports_object.push_str("__wbindgen_object_drop_ref: dropRef,\n");
|
||||
let name = m.import_name("__wbindgen_object_drop_ref");
|
||||
imports_object.push_str(&format!("{}: dropRef,\n", name));
|
||||
}
|
||||
|
||||
if self.wasm_import_needed("__wbindgen_throw", m) {
|
||||
self.expose_get_string_from_wasm();
|
||||
imports_object.push_str("__wbindgen_throw: function(ptr: number, len: number) {
|
||||
throw new Error(getStringFromWasm(ptr, len));
|
||||
},\n");
|
||||
imports_object.push_str(&format!("\
|
||||
{}: function(ptr: number, len: number) {{
|
||||
throw new Error(getStringFromWasm(ptr, len));
|
||||
}},
|
||||
",
|
||||
m.import_name("__wbindgen_throw"),
|
||||
));
|
||||
}
|
||||
|
||||
let mut writes = String::new();
|
||||
@ -608,14 +640,14 @@ impl Js {
|
||||
)
|
||||
}
|
||||
|
||||
fn wasm_import_needed(&self, name: &str, m: &Module) -> bool {
|
||||
let imports = match m.import_section() {
|
||||
fn wasm_import_needed(&self, name: &str, m: &Mapped) -> bool {
|
||||
let imports = match m.module.import_section() {
|
||||
Some(s) => s,
|
||||
None => return false,
|
||||
};
|
||||
|
||||
imports.entries().iter().any(|i| {
|
||||
i.module() == "env" && i.field() == name
|
||||
i.module() == "env" && i.field() == m.import_name(name)
|
||||
})
|
||||
}
|
||||
|
||||
@ -883,37 +915,37 @@ impl Js {
|
||||
");
|
||||
}
|
||||
|
||||
fn expose_pass_string_to_wasm(&mut self) {
|
||||
fn expose_pass_string_to_wasm(&mut self, m: &Mapped) {
|
||||
if !self.exposed_globals.insert("pass_string_to_wasm") {
|
||||
return
|
||||
}
|
||||
self.expose_wasm_exports();
|
||||
self.expose_global_memory();
|
||||
if self.nodejs {
|
||||
self.globals.push_str("
|
||||
function passStringToWasm(arg: string): [number, number] {
|
||||
self.globals.push_str(&format!("
|
||||
function passStringToWasm(arg: string): [number, number] {{
|
||||
if (typeof(arg) !== 'string')
|
||||
throw new Error('expected a string argument');
|
||||
const buf = Buffer.from(arg);
|
||||
const len = buf.length;
|
||||
const ptr = wasm_exports.__wbindgen_malloc(len);
|
||||
const ptr = wasm_exports.{}(len);
|
||||
buf.copy(Buffer.from(memory.buffer), ptr);
|
||||
return [ptr, len];
|
||||
}
|
||||
");
|
||||
}}
|
||||
", m.export_name("__wbindgen_malloc")));
|
||||
} else {
|
||||
self.globals.push_str("
|
||||
function passStringToWasm(arg: string): [number, number] {
|
||||
self.globals.push_str(&format!("
|
||||
function passStringToWasm(arg: string): [number, number] {{
|
||||
if (typeof(arg) !== 'string')
|
||||
throw new Error('expected a string argument');
|
||||
const buf = new TextEncoder('utf-8').encode(arg);
|
||||
const len = buf.length;
|
||||
const ptr = wasm_exports.__wbindgen_malloc(len);
|
||||
const ptr = wasm_exports.{}(len);
|
||||
let array = new Uint8Array(memory.buffer);
|
||||
array.set(buf, ptr);
|
||||
return [ptr, len];
|
||||
}
|
||||
");
|
||||
}}
|
||||
", m.export_name("__wbindgen_malloc")));
|
||||
}
|
||||
}
|
||||
|
||||
@ -966,10 +998,6 @@ impl Js {
|
||||
stack.push(obj);
|
||||
return ((stack.length - 1) << 1) | 1;
|
||||
}
|
||||
|
||||
function popBorrowedObject(): void {
|
||||
stack.pop();
|
||||
}
|
||||
");
|
||||
}
|
||||
|
||||
|
||||
@ -37,9 +37,10 @@ fn main() {
|
||||
.unwrap_or_else(|e| e.exit());
|
||||
|
||||
let mut b = Bindgen::new();
|
||||
b.input_path(&args.arg_input);
|
||||
b.nodejs(args.flag_nodejs);
|
||||
b.debug(args.flag_debug);
|
||||
b.input_path(&args.arg_input)
|
||||
.nodejs(args.flag_nodejs)
|
||||
.debug(args.flag_debug)
|
||||
.uglify_wasm_names(!args.flag_debug);
|
||||
let ret = b.generate().expect("failed to generate bindings");
|
||||
if let Some(ref ts) = args.flag_output_ts {
|
||||
ret.write_ts_to(ts).expect("failed to write TypeScript output file");
|
||||
|
||||
42
tests/uglify.rs
Normal file
42
tests/uglify.rs
Normal file
@ -0,0 +1,42 @@
|
||||
extern crate test_support;
|
||||
|
||||
#[test]
|
||||
fn works() {
|
||||
test_support::project()
|
||||
.uglify(true)
|
||||
.file("src/lib.rs", r#"
|
||||
#![feature(proc_macro)]
|
||||
|
||||
extern crate wasm_bindgen;
|
||||
|
||||
use wasm_bindgen::prelude::*;
|
||||
|
||||
wasm_bindgen! {
|
||||
pub struct A {}
|
||||
|
||||
impl A {
|
||||
pub fn new() -> A {
|
||||
A {}
|
||||
}
|
||||
}
|
||||
pub fn clone(a: &JsObject) -> JsObject {
|
||||
drop(a.clone());
|
||||
a.clone()
|
||||
}
|
||||
}
|
||||
"#)
|
||||
.file("test.ts", r#"
|
||||
import * as assert from "assert";
|
||||
import { Exports, Imports } from "./out";
|
||||
|
||||
export const imports: Imports = {};
|
||||
|
||||
export function test(wasm: Exports) {
|
||||
let sym = Symbol('a');
|
||||
assert.strictEqual(wasm.clone(sym), sym);
|
||||
let a = wasm.A.new();
|
||||
a.free();
|
||||
}
|
||||
"#)
|
||||
.test();
|
||||
}
|
||||
Loading…
x
Reference in New Issue
Block a user