mirror of
https://github.com/fluencelabs/wasm-bindgen
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Merge pull request #686 from fitzgen/guide-supported-types-example-usage
guide: Start adding example usage to "supported types" section
This commit is contained in:
Sendil Kumar N
GitHub
commit
6457f64a43
@ -55,6 +55,7 @@ members = [
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"examples/comments",
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"examples/console_log",
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"examples/dom",
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"examples/guide-supported-types-examples",
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"examples/hello_world",
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"examples/import_js",
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"examples/julia_set",
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3
examples/guide-supported-types-examples/.gitignore
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3
examples/guide-supported-types-examples/.gitignore
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@ -0,0 +1,3 @@
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package-lock.json
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guide_supported_types_examples.js
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guide_supported_types_examples_bg.wasm
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10
examples/guide-supported-types-examples/Cargo.toml
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10
examples/guide-supported-types-examples/Cargo.toml
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[package]
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name = "guide-supported-types-examples"
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version = "0.1.0"
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authors = ["Nick Fitzgerald <fitzgen@gmail.com>"]
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[lib]
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crate-type = ["cdylib"]
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[dependencies]
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wasm-bindgen = { path = "../.." }
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61
examples/guide-supported-types-examples/README.md
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61
examples/guide-supported-types-examples/README.md
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@ -0,0 +1,61 @@
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# Adding Numbers
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[View this example online](https://webassembly.studio/?f=612vwsrmwft)
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This directory is an example of using the `#[wasm_bindgen]` macro to simply add
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two numbers. The neat part about this is that it's an example of how to generate
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the smallest wasm-bindgen binary.
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You can build the example with:
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```
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$ ./build.sh
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```
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(or running the commands on Windows manually)
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Currently this generates a 651 byte wasm binary:
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```
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$ ls -alh add_bg.wasm
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-rw-rw-r-- 1 alex alex 651 Apr 20 22:16 add_bg.wasm
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```
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If you run [wasm-opt], a C++ tool for optimize WebAssembly, you can make it even
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smaller too!
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```
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$ wasm-opt -Os add_bg.wasm -o add.wasm
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$ ls -alh add.wasm
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-rw-rw-r-- 1 alex alex 100 Apr 20 22:19 add.wasm
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```
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And sure enough, using the [wasm2wat] tool it's quite small!
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```
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$ wasm2wat add.wasm
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(module
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(type (;0;) (func (param i32 i32) (result i32)))
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(func (;0;) (type 0) (param i32 i32) (result i32)
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get_local 1
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get_local 0
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i32.add)
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(memory (;0;) 2)
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(export "memory" (memory 0))
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(export "add" (func 0))
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(data (i32.const 1545) "invalid malloc request"))
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```
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Note that it's important to point out that the size reductions here are because
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the wasm is compiled in release mode by the build script and this crate's
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workspace has the following configuration
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```toml
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[profile.release]
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lto = true
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opt-level = 's'
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panic = 'abort'
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```
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[wasm2wat]: https://github.com/webassembly/wabt
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[wasm-opt]: https://github.com/webassembly/binaryen
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2
examples/guide-supported-types-examples/bootstrap.js
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2
examples/guide-supported-types-examples/bootstrap.js
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import * as imported_types from './imported_types.js';
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import * as exported_types from './exported_types.js';
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12
examples/guide-supported-types-examples/build.sh
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12
examples/guide-supported-types-examples/build.sh
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#!/bin/sh
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# For more coments about what's going on here, see the `hello_world` example
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set -ex
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cargo +nightly build --target wasm32-unknown-unknown --release
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cargo +nightly run --manifest-path ../../crates/cli/Cargo.toml \
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--bin wasm-bindgen -- \
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../../target/wasm32-unknown-unknown/release/guide_supported_types_examples.wasm --out-dir .
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npm install
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npm run serve
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@ -0,0 +1 @@
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console.log("todo")
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26
examples/guide-supported-types-examples/imported_types.js
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examples/guide-supported-types-examples/imported_types.js
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import {
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imported_type_by_value,
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imported_type_by_shared_ref,
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return_imported_type,
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take_option_imported_type,
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return_option_imported_type,
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} from './guide_supported_types_examples';
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imported_type_by_value(new SomeJsType());
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imported_type_by_shared_ref(new SomeJsType());
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let x = return_imported_type();
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console.log(x instanceof SomeJsType);
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// true
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take_option_imported_type(null);
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take_option_imported_type(undefined);
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take_option_imported_type(new SomeJsType());
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let y = return_option_imported_type();
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if (y == null) {
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// ...
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} else {
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console.log(y instanceof SomeJsType);
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// true
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}
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8
examples/guide-supported-types-examples/index.html
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8
examples/guide-supported-types-examples/index.html
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<html>
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<head>
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<meta content="text/html;charset=utf-8" http-equiv="Content-Type"/>
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</head>
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<body>
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<script src='./index.js'></script>
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</body>
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</html>
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5
examples/guide-supported-types-examples/index.js
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5
examples/guide-supported-types-examples/index.js
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// For more comments about what's going on here, check out the `hello_world`
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// example
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import('./bootstrap').then(() => {
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console.log("done");
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});
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10
examples/guide-supported-types-examples/package.json
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10
examples/guide-supported-types-examples/package.json
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{
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"scripts": {
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"serve": "webpack-dev-server"
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},
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"devDependencies": {
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"webpack": "^4.11.1",
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"webpack-cli": "^2.0.10",
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"webpack-dev-server": "^3.1.0"
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}
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}
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@ -0,0 +1,6 @@
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use wasm_bindgen::prelude::*;
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#[wasm_bindgen]
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pub struct RustType {
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inner: u32,
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}
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@ -0,0 +1,25 @@
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use wasm_bindgen::prelude::*;
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#[wasm_bindgen]
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extern {
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pub type SomeJsType;
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}
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#[wasm_bindgen]
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pub fn imported_type_by_value(x: SomeJsType) { /* ... */ }
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#[wasm_bindgen]
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pub fn imported_type_by_shared_ref(x: &SomeJsType) { /* ... */ }
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#[wasm_bindgen]
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pub fn return_imported_type() -> SomeJsType {
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unimplemented!()
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}
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#[wasm_bindgen]
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pub fn take_option_imported_type(x: Option<SomeJsType>) { /* ... */ }
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#[wasm_bindgen]
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pub fn return_option_imported_type() -> Option<SomeJsType> {
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unimplemented!()
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}
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7
examples/guide-supported-types-examples/src/lib.rs
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7
examples/guide-supported-types-examples/src/lib.rs
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#![feature(use_extern_macros)]
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#![allow(unused_variables, dead_code)]
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extern crate wasm_bindgen;
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pub mod imported_types;
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pub mod exported_types;
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10
examples/guide-supported-types-examples/webpack.config.js
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10
examples/guide-supported-types-examples/webpack.config.js
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const path = require('path');
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module.exports = {
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entry: './index.js',
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output: {
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path: path.resolve(__dirname, 'dist'),
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filename: 'index.js',
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},
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mode: 'development'
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};
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@ -1,21 +1,122 @@
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# Supported Types
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# Supported Rust Types and their JavaScript Representations
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The table below provides an overview of all the types that `wasm-bindgen` can
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send and receive across the WebAssembly ABI boundary.
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This section provides an overview of all the types that `wasm-bindgen` can send
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and receive across the WebAssembly ABI boundary, and how they translate into
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JavaScript.
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| Type | `T` parameter | `&T` parameter | `&mut T` parameter | `T` return value | `Option<T>` parameter | `Option<T>` return value |
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|:---:|:---:|:---:|:---:|:---:|:---:|
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| Imported `extern Whatever;` JavaScript Types | Yes | Yes | Yes | Yes | Yes | Yes |
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| Exported `struct Whatever` Rust Types | Yes | Yes | Yes | Yes | Yes | Yes |
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| `str` | No | Yes | No | Yes | Yes | No |
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| `String` | Yes | No | No | Yes | Yes | Yes |
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| `char` | Yes | No | No | Yes | No | No |
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| `bool` | Yes | No | No | Yes | No | No |
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| `JsValue` | Yes | Yes | Yes | Yes | No | No |
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| `Box<[JsValue]>` | Yes | No | No | Yes | Yes | yes |
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| `*const T` | Yes | No | No | Yes | No | No |
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| `*mut T` | Yes | No | No | Yes | No | No |
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| `u8` `i8` `u16` `i16` `u64` `i64` `isize` `size` | Yes | No | No | Yes | No | No |
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| `u32` `i32` `f32` `f64` | Yes | Yes | Yes | Yes | No | No |
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| `Box<[u8]>` `Box<[i8]>` `Box<[u16]>` `Box<[i16]>` `Box<[u32]>` `Box<[i32]>` `Box<[u64]>` `Box<[i64]>` `Box<[f32]>` `Box<[f64]`> | Yes | No | No | Yes | Yes | Yes |
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| `[u8]` `[i8]` `[u16]` `[i16]` `[u32]` `[i32]` `[u64]` `[i64]` `[f32]` `[f64]` | No | Yes | Yes | No | Yes | No |
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## Imported `extern Whatever;` JavaScript Types
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| `T` parameter | `&T` parameter | `&mut T` parameter | `T` return value | `Option<T>` parameter | `Option<T>` return value | JavaScript representation |
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|:---:|:---:|:---:|:---:|:---:|:---:|:---:|
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| Yes | Yes | No | Yes | Yes | Yes | Instances of the extant `Whatever` JavaScript class / prototype constructor |
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### Example Rust Usage
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```rust
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{{#include ../../../examples/guide-supported-types-examples/src/imported_types.rs}}
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```
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### Example JavaScript Usage
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```js
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{{#include ../../../examples/guide-supported-types-examples/imported_types.js}}
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```
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## Exported `struct Whatever` Rust Types
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| `T` parameter | `&T` parameter | `&mut T` parameter | `T` return value | `Option<T>` parameter | `Option<T>` return value | JavaScript representation |
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|:---:|:---:|:---:|:---:|:---:|:---:|:---:|
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| Yes | Yes | Yes | Yes | Yes | Yes | Instances of a `wasm-bindgen`-generated JavaScript `class Whatever { ... }` |
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### Example Rust Usage
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```rust
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{{#include ../../../examples/guide-supported-types-examples/src/exported_types.rs}}
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```
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### Example JavaScript Usage
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```js
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{{#include ../../../examples/guide-supported-types-examples/exported_types.js}}
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```
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## `str`
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| `T` parameter | `&T` parameter | `&mut T` parameter | `T` return value | `Option<T>` parameter | `Option<T>` return value | JavaScript representation |
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|:---:|:---:|:---:|:---:|:---:|:---:|:---:|
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| No | Yes | No | Yes | Yes | No | JavaScript string value |
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Copies the string's contents back and forth between the JavaScript
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garbage-collected heap and the Wasm linear memory with `TextDecoder` and
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`TextEncoder`. If you don't want to perform this copy, and would rather work
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with handles to JavaScript string values, use the `js_sys::JsString` type.
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## `String`
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| `T` parameter | `&T` parameter | `&mut T` parameter | `T` return value | `Option<T>` parameter | `Option<T>` return value | JavaScript representation |
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|:---:|:---:|:---:|:---:|:---:|:---:|:---:|
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| Yes | No | No | Yes | Yes | Yes | JavaScript string value |
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Copies the string's contents back and forth between the JavaScript
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garbage-collected heap and the Wasm linear memory with `TextDecoder` and
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`TextEncoder`
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## `char`
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| `T` parameter | `&T` parameter | `&mut T` parameter | `T` return value | `Option<T>` parameter | `Option<T>` return value | JavaScript representation |
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|:---:|:---:|:---:|:---:|:---:|:---:|:---:|
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| Yes | No | No | Yes | No | No | A JavaScript string value |
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## `bool`
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| `T` parameter | `&T` parameter | `&mut T` parameter | `T` return value | `Option<T>` parameter | `Option<T>` return value | JavaScript representation |
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|:---:|:---:|:---:|:---:|:---:|:---:|:---:|
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| Yes | No | No | Yes | No | No | A JavaScript boolean value |
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## `wasm_bindgen::JsValue`
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| `T` parameter | `&T` parameter | `&mut T` parameter | `T` return value | `Option<T>` parameter | `Option<T>` return value | JavaScript representation |
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|:---:|:---:|:---:|:---:|:---:|:---:|:---:|
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| Yes | Yes | Yes | Yes | No | No | Any JavaScript value |
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## `Box<[JsValue]>`
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| `T` parameter | `&T` parameter | `&mut T` parameter | `T` return value | `Option<T>` parameter | `Option<T>` return value | JavaScript representation |
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|:---:|:---:|:---:|:---:|:---:|:---:|:---:|
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| Yes | No | No | Yes | Yes | Yes | A JavaScript `Array` object |
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## `*const T` `*mut T`
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| `T` parameter | `&T` parameter | `&mut T` parameter | `T` return value | `Option<T>` parameter | `Option<T>` return value | JavaScript representation |
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|:---:|:---:|:---:|:---:|:---:|:---:|:---:|
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| Yes | No | No | Yes | No | No | A JavaScript number value |
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## `u8` `i8` `u16` `i16` `u64` `i64` `isize` `size`
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| `T` parameter | `&T` parameter | `&mut T` parameter | `T` return value | `Option<T>` parameter | `Option<T>` return value | JavaScript representation |
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|:---:|:---:|:---:|:---:|:---:|:---:|:---:|
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| Yes | No | No | Yes | No | No | A JavaScript number value |
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## `u32` `i32` `f32` `f64`
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| `T` parameter | `&T` parameter | `&mut T` parameter | `T` return value | `Option<T>` parameter | `Option<T>` return value | JavaScript representation |
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|:---:|:---:|:---:|:---:|:---:|:---:|:---:|
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| Yes | Yes | Yes | Yes | No | No | A JavaScript number value |
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## `Box<[u8]>` `Box<[i8]>` `Box<[u16]>` `Box<[i16]>` `Box<[u32]>` `Box<[i32]>` `Box<[u64]>` `Box<[i64]>` `Box<[f32]>` `Box<[f64]>`
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|
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| `T` parameter | `&T` parameter | `&mut T` parameter | `T` return value | `Option<T>` parameter | `Option<T>` return value | JavaScript representation |
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|:---:|:---:|:---:|:---:|:---:|:---:|:---:|
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| Yes | No | No | Yes | Yes | Yes | A JavaScript `TypedArray` view of the Wasm memory for the boxed slice of the appropriate type (`Int32Array`, `Uint8Array`, etc) |
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Note that this does ***not*** copy the whole slice of memory back and forth into
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the JavaScript heap from the Wasm linear memory.
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## `[u8]` `[i8]` `[u16]` `[i16]` `[u32]` `[i32]` `[u64]` `[i64]` `[f32]` `[f64]`
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|
||||
| `T` parameter | `&T` parameter | `&mut T` parameter | `T` return value | `Option<T>` parameter | `Option<T>` return value | JavaScript representation |
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||||
|:---:|:---:|:---:|:---:|:---:|:---:|:---:|
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| No | Yes | Yes | No | Yes | No | A JavaScript `TypedArray` view of the Wasm memory for the boxed slice of the appropriate type (`Int32Array`, `Uint8Array`, etc) |
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Note that this does ***not*** copy the whole slice of memory back and forth into
|
||||
the JavaScript heap from the Wasm linear memory.
|
||||
|
||||
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