mirror of
https://github.com/fluencelabs/wasm-bindgen
synced 2025-04-03 02:41:06 +00:00
6093fd29d1
The wasm spec defines boolean conversion when crossing to the wasm type i32 as 1 for `true` and 0 for `false`, so no need for us to do it ourselves!
725 lines
25 KiB
Rust
725 lines
25 KiB
Rust
use failure::Error;
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use super::Context;
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use descriptor::{Descriptor, Function};
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/// Helper struct for manufacturing a shim in JS used to translate JS types to
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/// Rust, aka pass from JS back into Rust
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pub struct Js2Rust<'a, 'b: 'a> {
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cx: &'a mut Context<'b>,
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/// Arguments passed to the invocation of the wasm function, aka things that
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/// are only numbers.
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rust_arguments: Vec<String>,
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/// Arguments and their types to the JS shim.
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pub js_arguments: Vec<(String, String)>,
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/// Conversions that happen before we invoke the wasm function, such as
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/// converting a string to a ptr/length pair.
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prelude: String,
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/// "Destructors" or cleanup that must happen after the wasm function
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/// finishes. This is scheduled in a `finally` block.
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finally: String,
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/// Index of the next argument for unique name generation purposes.
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arg_idx: usize,
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/// Typescript expression representing the type of the return value of this
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/// function.
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ret_ty: String,
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/// Expression used to generate the return value. The string "RET" in this
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/// expression is replaced with the actual wasm invocation eventually.
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ret_expr: String,
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/// Name of the JS shim/function that we're generating, primarily for
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/// TypeScript right now.
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js_name: String,
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/// whether or not this generated function body will act like a constructor,
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/// meaning it doesn't actually return something but rather assigns to
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/// `this`
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///
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/// The string value here is the class that this should be a constructor
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/// for.
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constructor: Option<String>,
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}
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impl<'a, 'b> Js2Rust<'a, 'b> {
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pub fn new(js_name: &str, cx: &'a mut Context<'b>) -> Js2Rust<'a, 'b> {
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Js2Rust {
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cx,
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js_name: js_name.to_string(),
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rust_arguments: Vec::new(),
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js_arguments: Vec::new(),
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prelude: String::new(),
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finally: String::new(),
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arg_idx: 0,
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ret_ty: String::new(),
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ret_expr: String::new(),
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constructor: None,
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}
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}
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/// Generates all bindings necessary for the signature in `Function`,
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/// creating necessary argument conversions and return value processing.
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pub fn process(&mut self, function: &Function) -> Result<&mut Self, Error> {
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for arg in function.arguments.iter() {
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self.argument(arg)?;
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}
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self.ret(&function.ret)?;
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Ok(self)
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}
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pub fn constructor(&mut self, class: Option<&str>) -> &mut Self {
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self.constructor = class.map(|s| s.to_string());
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self
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}
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/// Flag this shim as a method call into Rust, so the first Rust argument
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/// passed should be `this.ptr`.
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pub fn method(&mut self, method: bool, consumed: bool) -> &mut Self {
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if method {
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if self.cx.config.debug {
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self.prelude(
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"if (this.ptr === 0) {
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throw new Error('Attempt to use a moved value');
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}",
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);
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}
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if consumed {
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self.prelude(
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"\
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const ptr = this.ptr;\n\
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this.ptr = 0;\n\
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",
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);
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self.rust_arguments.insert(0, "ptr".to_string());
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} else {
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self.rust_arguments.insert(0, "this.ptr".to_string());
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}
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}
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self
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}
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/// Add extra processing to the prelude of this shim.
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pub fn prelude(&mut self, s: &str) -> &mut Self {
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for line in s.lines() {
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self.prelude.push_str(line);
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self.prelude.push_str("\n");
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}
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self
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}
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/// Add extra processing to the finally block of this shim.
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pub fn finally(&mut self, s: &str) -> &mut Self {
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for line in s.lines() {
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self.finally.push_str(line);
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self.finally.push_str("\n");
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}
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self
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}
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/// Add an Rust argument to be passed manually.
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pub fn rust_argument(&mut self, s: &str) -> &mut Self {
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self.rust_arguments.push(s.to_string());
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self
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}
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fn abi_arg(&mut self) -> String {
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let s = format!("arg{}", self.arg_idx);
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self.arg_idx += 1;
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s
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}
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pub fn argument(&mut self, arg: &Descriptor) -> Result<&mut Self, Error> {
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let i = self.arg_idx;
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let name = self.abi_arg();
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let (arg, optional) = match arg {
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Descriptor::Option(t) => (&**t, true),
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_ => (arg, false),
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};
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if let Some(kind) = arg.vector_kind() {
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self.js_arguments
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.push((name.clone(), kind.js_ty().to_string()));
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let func = self.cx.pass_to_wasm_function(kind)?;
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let val = if optional {
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self.cx.expose_is_like_none();
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format!("isLikeNone({}) ? [0, 0] : {}({})", name, func, name)
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} else {
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format!("{}({})", func, name)
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};
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self.prelude(&format!(
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"const [ptr{i}, len{i}] = {val};",
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i = i,
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val = val,
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));
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if arg.is_by_ref() || arg.is_clamped_by_ref() {
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if optional {
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bail!("optional slices aren't currently supported");
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}
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if arg.is_mut_ref() {
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let get = self.cx.memview_function(kind);
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self.finally(&format!(
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"\
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{arg}.set({get}().subarray(\
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ptr{i} / {size}, \
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ptr{i} / {size} + len{i}\
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));\n\
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",
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i = i,
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arg = name,
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get = get,
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size = kind.size()
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));
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}
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self.finally(&format!(
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"\
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wasm.__wbindgen_free(ptr{i}, len{i} * {size});\n\
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",
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i = i,
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size = kind.size()
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));
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self.cx.require_internal_export("__wbindgen_free")?;
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}
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self.rust_arguments.push(format!("ptr{}", i));
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self.rust_arguments.push(format!("len{}", i));
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return Ok(self);
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}
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if arg.is_anyref() {
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self.js_arguments.push((name.clone(), "any".to_string()));
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self.cx.expose_add_heap_object();
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if optional {
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self.cx.expose_is_like_none();
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self.rust_arguments
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.push(format!("isLikeNone({0}) ? 0 : addHeapObject({0})", name,));
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} else {
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self.rust_arguments.push(format!("addHeapObject({})", name));
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}
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return Ok(self);
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}
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if optional {
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if arg.is_wasm_native() {
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self.cx.expose_is_like_none();
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self.js_arguments.push((name.clone(), "number".to_string()));
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if self.cx.config.debug {
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self.cx.expose_assert_num();
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self.prelude(&format!(
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"
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if (!isLikeNone({0})) {{
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_assertNum({0});
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}}
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",
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name
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));
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}
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self.rust_arguments.push(format!("!isLikeNone({0})", name));
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self.rust_arguments
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.push(format!("isLikeNone({0}) ? 0 : {0}", name));
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return Ok(self);
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}
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if arg.is_abi_as_u32() {
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self.cx.expose_is_like_none();
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self.js_arguments.push((name.clone(), "number".to_string()));
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if self.cx.config.debug {
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self.cx.expose_assert_num();
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self.prelude(&format!(
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"
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if (!isLikeNone({0})) {{
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_assertNum({0});
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}}
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",
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name
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));
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}
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self.rust_arguments
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.push(format!("isLikeNone({0}) ? 0xFFFFFF : {0}", name));
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return Ok(self);
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}
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if let Some(signed) = arg.get_64() {
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let f = if signed {
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self.cx.expose_int64_cvt_shim()
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} else {
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self.cx.expose_uint64_cvt_shim()
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};
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self.cx.expose_uint32_memory();
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self.cx.expose_global_argument_ptr()?;
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self.js_arguments.push((name.clone(), "BigInt".to_string()));
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self.prelude(&format!(
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"
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{f}[0] = isLikeNone({name}) ? BigInt(0) : {name};
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const low{i} = isLikeNone({name}) ? 0 : u32CvtShim[0];
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const high{i} = isLikeNone({name}) ? 0 : u32CvtShim[1];
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",
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i = i,
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f = f,
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name = name,
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));
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self.rust_arguments.push(format!("!isLikeNone({})", name));
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self.rust_arguments.push(format!("0"));
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self.rust_arguments.push(format!("low{}", i));
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self.rust_arguments.push(format!("high{}", i));
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return Ok(self);
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}
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match *arg {
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Descriptor::Boolean => {
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self.cx.expose_is_like_none();
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self.js_arguments
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.push((name.clone(), "boolean".to_string()));
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if self.cx.config.debug {
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self.cx.expose_assert_bool();
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self.prelude(&format!(
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"
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if (!isLikeNone({0})) {{
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_assertBoolean({0});
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}}
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",
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name,
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));
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}
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self.rust_arguments
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.push(format!("isLikeNone({0}) ? 0xFFFFFF : {0} ? 1 : 0", name));
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return Ok(self);
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}
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Descriptor::Char => {
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self.cx.expose_is_like_none();
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self.js_arguments.push((name.clone(), "string".to_string()));
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self.rust_arguments.push(format!("!isLikeNone({0})", name));
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self.rust_arguments
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.push(format!("isLikeNone({0}) ? 0 : {0}.codePointAt(0)", name));
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return Ok(self);
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}
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_ => bail!(
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"unsupported optional argument type for calling Rust function from JS: {:?}",
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arg
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),
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};
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}
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if let Some(s) = arg.rust_struct() {
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self.js_arguments.push((name.clone(), s.to_string()));
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if self.cx.config.debug {
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self.cx.expose_assert_class();
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self.prelude(&format!(
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"\
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_assertClass({arg}, {struct_});\n\
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",
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arg = name,
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struct_ = s
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));
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}
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if arg.is_by_ref() {
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self.rust_arguments.push(format!("{}.ptr", name));
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} else {
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self.prelude(&format!(
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"\
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const ptr{i} = {arg}.ptr;\n\
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if (ptr{i} === 0) {{
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throw new Error('Attempt to use a moved value');
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}}
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{arg}.ptr = 0;\n\
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",
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i = i,
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arg = name
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));
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self.rust_arguments.push(format!("ptr{}", i));
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}
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return Ok(self);
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}
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if arg.is_number() {
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self.js_arguments.push((name.clone(), "number".to_string()));
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if self.cx.config.debug {
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self.cx.expose_assert_num();
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self.prelude(&format!("_assertNum({});", name));
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}
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self.rust_arguments.push(name);
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return Ok(self);
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}
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if let Some(signed) = arg.get_64() {
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let f = if signed {
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self.cx.expose_int64_cvt_shim()
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} else {
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self.cx.expose_uint64_cvt_shim()
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};
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self.cx.expose_uint32_memory();
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self.cx.expose_global_argument_ptr()?;
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self.js_arguments.push((name.clone(), "BigInt".to_string()));
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self.prelude(&format!(
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"
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{f}[0] = {name};
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const low{i} = u32CvtShim[0];
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const high{i} = u32CvtShim[1];
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",
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i = i,
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f = f,
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name = name,
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));
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self.rust_arguments.push(format!("low{}", i));
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self.rust_arguments.push(format!("high{}", i));
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return Ok(self);
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}
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if arg.is_ref_anyref() {
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self.js_arguments.push((name.clone(), "any".to_string()));
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self.cx.expose_borrowed_objects();
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self.finally("stack.pop();");
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self.rust_arguments
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.push(format!("addBorrowedObject({})", name));
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return Ok(self);
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}
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match *arg {
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Descriptor::Boolean => {
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self.js_arguments
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.push((name.clone(), "boolean".to_string()));
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if self.cx.config.debug {
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self.cx.expose_assert_bool();
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self.prelude(&format!(
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"\
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_assertBoolean({name});\n\
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",
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name = name
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));
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}
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self.rust_arguments.push(format!("{}", name));
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}
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Descriptor::Char => {
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self.js_arguments.push((name.clone(), "string".to_string()));
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self.rust_arguments.push(format!("{}.codePointAt(0)", name))
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}
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_ => bail!(
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"unsupported argument type for calling Rust function from JS: {:?}",
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arg
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),
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}
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Ok(self)
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}
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pub fn ret(&mut self, ty: &Descriptor) -> Result<&mut Self, Error> {
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if let Some(name) = ty.rust_struct() {
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match &self.constructor {
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Some(class) if class == name => {
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self.ret_expr = format!("this.ptr = RET;");
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if self.cx.config.weak_refs {
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self.ret_expr.push_str(&format!(
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"\
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addCleanup(this, this.ptr, free{});
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",
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name
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));
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}
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}
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Some(class) => bail!("constructor for `{}` cannot return `{}`", class, name),
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None => {
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self.ret_ty = name.to_string();
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self.cx.require_class_wrap(name);
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self.ret_expr = format!("return {name}.__wrap(RET);", name = name);
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}
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}
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return Ok(self);
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}
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if self.constructor.is_some() {
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bail!("constructor functions must return a Rust structure")
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}
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if let Descriptor::Unit = ty {
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self.ret_ty = "void".to_string();
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self.ret_expr = format!("return RET;");
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return Ok(self);
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}
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let (ty, optional) = match ty {
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Descriptor::Option(t) => (&**t, true),
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_ => (ty, false),
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};
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if let Some(ty) = ty.vector_kind() {
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self.ret_ty = ty.js_ty().to_string();
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let f = self.cx.expose_get_vector_from_wasm(ty);
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self.cx.expose_global_argument_ptr()?;
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self.cx.expose_uint32_memory();
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self.cx.require_internal_export("__wbindgen_free")?;
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self.prelude("const retptr = globalArgumentPtr();");
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self.rust_arguments.insert(0, "retptr".to_string());
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self.ret_expr = format!(
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"\
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RET;\n\
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const mem = getUint32Memory();\n\
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const rustptr = mem[retptr / 4];\n\
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const rustlen = mem[retptr / 4 + 1];\n\
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{guard}
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const realRet = {}(rustptr, rustlen).slice();\n\
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wasm.__wbindgen_free(rustptr, rustlen * {});\n\
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return realRet;\n\
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",
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f,
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ty.size(),
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guard = if optional {
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"if (rustptr === 0) return;"
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} else {
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""
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},
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);
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return Ok(self);
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}
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// No need to worry about `optional` here, the abi representation means
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// that `takeObject` will naturally pluck out `undefined`.
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if ty.is_anyref() {
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self.ret_ty = "any".to_string();
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self.cx.expose_take_object();
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self.ret_expr = format!("return takeObject(RET);");
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return Ok(self);
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}
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if optional {
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if ty.is_wasm_native() {
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self.ret_ty = "number | undefined".to_string();
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self.cx.expose_global_argument_ptr()?;
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self.cx.expose_uint32_memory();
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match ty {
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Descriptor::I32 => self.cx.expose_int32_memory(),
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Descriptor::U32 => (),
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Descriptor::F32 => self.cx.expose_f32_memory(),
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Descriptor::F64 => self.cx.expose_f64_memory(),
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_ => (),
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};
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self.prelude("const retptr = globalArgumentPtr();");
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self.rust_arguments.insert(0, "retptr".to_string());
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self.ret_expr = format!(
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"
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RET;
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const present = getUint32Memory()[retptr / 4];
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const value = {mem}[retptr / {size} + 1];
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return present === 0 ? undefined : value;
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",
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size = match ty {
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Descriptor::I32 => 4,
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Descriptor::U32 => 4,
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Descriptor::F32 => 4,
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Descriptor::F64 => 8,
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_ => unreachable!(),
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},
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mem = match ty {
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Descriptor::I32 => "getInt32Memory()",
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Descriptor::U32 => "getUint32Memory()",
|
|
Descriptor::F32 => "getFloat32Memory()",
|
|
Descriptor::F64 => "getFloat64Memory()",
|
|
_ => unreachable!(),
|
|
}
|
|
);
|
|
return Ok(self);
|
|
}
|
|
|
|
if ty.is_abi_as_u32() {
|
|
self.ret_ty = "number | undefined".to_string();
|
|
self.ret_expr = "
|
|
const ret = RET;
|
|
return ret === 0xFFFFFF ? undefined : ret;
|
|
".to_string();
|
|
return Ok(self);
|
|
}
|
|
|
|
if let Some(signed) = ty.get_64() {
|
|
self.ret_ty = "BigInt | undefined".to_string();
|
|
self.cx.expose_global_argument_ptr()?;
|
|
let f = if signed {
|
|
self.cx.expose_int64_memory();
|
|
"getInt64Memory"
|
|
} else {
|
|
self.cx.expose_uint64_memory();
|
|
"getUint64Memory"
|
|
};
|
|
self.prelude("const retptr = globalArgumentPtr();");
|
|
self.rust_arguments.insert(0, "retptr".to_string());
|
|
self.ret_expr = format!(
|
|
"
|
|
RET;
|
|
const present = getUint32Memory()[retptr / 4];
|
|
const value = {}()[retptr / 8 + 1];
|
|
return present === 0 ? undefined : value;
|
|
",
|
|
f
|
|
);
|
|
return Ok(self);
|
|
}
|
|
|
|
match *ty {
|
|
Descriptor::Boolean => {
|
|
self.ret_ty = "boolean | undefined".to_string();
|
|
self.ret_expr = "
|
|
const ret = RET;
|
|
return ret === 0xFFFFFF ? undefined : ret !== 0;
|
|
".to_string();
|
|
return Ok(self);
|
|
}
|
|
Descriptor::Char => {
|
|
self.ret_ty = "string | undefined".to_string();
|
|
self.cx.expose_global_argument_ptr()?;
|
|
self.cx.expose_uint32_memory();
|
|
self.prelude("const retptr = globalArgumentPtr();");
|
|
self.rust_arguments.insert(0, "retptr".to_string());
|
|
self.ret_expr = "
|
|
RET;
|
|
const present = getUint32Memory()[retptr / 4];
|
|
const value = getUint32Memory()[retptr / 4 + 1];
|
|
return present === 0 ? undefined : String.fromCodePoint(value);
|
|
".to_string();
|
|
return Ok(self);
|
|
}
|
|
_ => bail!(
|
|
"unsupported optional return type for calling Rust function from JS: {:?}",
|
|
ty
|
|
),
|
|
};
|
|
}
|
|
|
|
if ty.is_ref_anyref() {
|
|
self.ret_ty = "any".to_string();
|
|
self.cx.expose_get_object();
|
|
self.ret_expr = format!("return getObject(RET);");
|
|
return Ok(self);
|
|
}
|
|
|
|
if ty.is_by_ref() {
|
|
bail!("cannot return references from Rust to JS yet")
|
|
}
|
|
|
|
if let Some(name) = ty.rust_struct() {
|
|
self.ret_ty = name.to_string();
|
|
self.cx.require_class_wrap(name);
|
|
self.ret_expr = format!("return {name}.__wrap(RET);", name = name);
|
|
return Ok(self);
|
|
}
|
|
|
|
if ty.is_number() {
|
|
self.ret_ty = "number".to_string();
|
|
self.ret_expr = format!("return RET;");
|
|
return Ok(self);
|
|
}
|
|
|
|
if let Some(signed) = ty.get_64() {
|
|
self.ret_ty = "BigInt".to_string();
|
|
self.cx.expose_global_argument_ptr()?;
|
|
let f = if signed {
|
|
self.cx.expose_int64_memory();
|
|
"getInt64Memory"
|
|
} else {
|
|
self.cx.expose_uint64_memory();
|
|
"getUint64Memory"
|
|
};
|
|
self.prelude("const retptr = globalArgumentPtr();");
|
|
self.rust_arguments.insert(0, "retptr".to_string());
|
|
self.ret_expr = format!(
|
|
"\
|
|
RET;\n\
|
|
return {}()[retptr / 8];\n\
|
|
",
|
|
f
|
|
);
|
|
return Ok(self);
|
|
}
|
|
|
|
match *ty {
|
|
Descriptor::Boolean => {
|
|
self.ret_ty = "boolean".to_string();
|
|
self.ret_expr = format!("return (RET) !== 0;");
|
|
}
|
|
Descriptor::Char => {
|
|
self.ret_ty = "string".to_string();
|
|
self.ret_expr = format!("return String.fromCodePoint(RET);")
|
|
}
|
|
_ => bail!(
|
|
"unsupported return type for calling Rust function from JS: {:?}",
|
|
ty
|
|
),
|
|
}
|
|
Ok(self)
|
|
}
|
|
|
|
pub fn js_doc_comments(&self) -> String {
|
|
let mut ret: String = self
|
|
.js_arguments
|
|
.iter()
|
|
.map(|a| format!("@param {{{}}} {}\n", a.1, a.0))
|
|
.collect();
|
|
ret.push_str(&format!("@returns {{{}}}", self.ret_ty));
|
|
ret
|
|
}
|
|
|
|
/// Generate the actual function.
|
|
///
|
|
/// The `prefix` specified is typically the string "function" but may be
|
|
/// different for classes. The `invoc` is the function expression that we're
|
|
/// invoking, like `wasm.bar` or `this.f`.
|
|
///
|
|
/// Returns two strings, the first of which is the JS expression for the
|
|
/// generated function shim and the second is a TypeScript signature of the
|
|
/// JS expression.
|
|
pub fn finish(&self, prefix: &str, invoc: &str) -> (String, String, String) {
|
|
let js_args = self
|
|
.js_arguments
|
|
.iter()
|
|
.map(|s| &s.0[..])
|
|
.collect::<Vec<_>>()
|
|
.join(", ");
|
|
let mut js = format!("{}({}) {{\n", prefix, js_args);
|
|
js.push_str(&self.prelude);
|
|
let rust_args = self.rust_arguments.join(", ");
|
|
|
|
let invoc = self
|
|
.ret_expr
|
|
.replace("RET", &format!("{}({})", invoc, rust_args));
|
|
let invoc = if self.finally.len() == 0 {
|
|
invoc
|
|
} else {
|
|
format!(
|
|
"\
|
|
try {{\n\
|
|
{}
|
|
\n}} finally {{\n\
|
|
{}
|
|
}}\n\
|
|
",
|
|
&invoc, &self.finally,
|
|
)
|
|
};
|
|
js.push_str(&invoc);
|
|
js.push_str("\n}");
|
|
let ts_args = self
|
|
.js_arguments
|
|
.iter()
|
|
.map(|s| format!("{}: {}", s.0, s.1))
|
|
.collect::<Vec<_>>()
|
|
.join(", ");
|
|
let mut ts = format!("{} {}({})", prefix, self.js_name, ts_args);
|
|
if self.constructor.is_none() {
|
|
ts.push_str(": ");
|
|
ts.push_str(&self.ret_ty);
|
|
}
|
|
ts.push_str(";\n");
|
|
(js, ts, self.js_doc_comments())
|
|
}
|
|
}
|