add emscripten support

.cargo/config.toml

@@ -1,2 +1,12 @@
 [target.'cfg(target_arch = "wasm32")']
 runner = 'cargo run -p wasm-bindgen-cli --bin wasm-bindgen-test-runner --'
+
+[build]
+
+[target.'cfg(all(target_arch = "wasm32", target_os = "emscripten"))']
+rustflags = [
+  "-Cllvm-args=-enable-emscripten-cxx-exceptions=0",
+  "-Clink-arg=-sERROR_ON_UNDEFINED_SYMBOLS=0",
+  "-Clink-arg=-Wno-undefined",
+  "-Crelocation-model=static",
+]

crates/backend/src/codegen.rs

@@ -162,7 +162,7 @@ impl TryToTokens for ast::Program {
         let prefix_json_bytes = syn::LitByteStr::new(&prefix_json_bytes, Span::call_site());
 
         (quote! {
-            #[cfg(all(target_arch = "wasm32", any(target_os = "unknown", target_os = "none")))]
+            #[cfg(all(target_arch = "wasm32", any(target_os = "unknown", target_os = "none", target_os = "emscripten")))]
             #[automatically_derived]
             const _: () = {
                 use #wasm_bindgen::__rt::{flat_len, flat_byte_slices};
@@ -281,12 +281,12 @@ impl ToTokens for ast::Struct {
                     let ptr = #wasm_bindgen::convert::IntoWasmAbi::into_abi(value);
 
                     #[link(wasm_import_module = "__wbindgen_placeholder__")]
-                    #[cfg(all(target_arch = "wasm32", any(target_os = "unknown", target_os = "none")))]
+                    #[cfg(all(target_arch = "wasm32", any(target_os = "unknown", target_os = "none", target_os = "emscripten")))]
                     extern "C" {
                         fn #new_fn(ptr: u32) -> u32;
                     }
 
-                    #[cfg(not(all(target_arch = "wasm32", any(target_os = "unknown", target_os = "none"))))]
+                    #[cfg(not(all(target_arch = "wasm32", any(target_os = "unknown", target_os = "none", target_os = "emscripten"))))]
                     unsafe fn #new_fn(_: u32) -> u32 {
                         panic!("cannot convert to JsValue outside of the Wasm target")
                     }
@@ -298,7 +298,7 @@ impl ToTokens for ast::Struct {
                 }
             }
 
-            #[cfg(all(target_arch = "wasm32", any(target_os = "unknown", target_os = "none")))]
+            #[cfg(all(target_arch = "wasm32", any(target_os = "unknown", target_os = "none", target_os = "emscripten")))]
             #[automatically_derived]
             const _: () = {
                 #wasm_bindgen::__wbindgen_coverage! {
@@ -388,12 +388,12 @@ impl ToTokens for ast::Struct {
                     let idx = #wasm_bindgen::convert::IntoWasmAbi::into_abi(&value);
 
                     #[link(wasm_import_module = "__wbindgen_placeholder__")]
-                    #[cfg(all(target_arch = "wasm32", any(target_os = "unknown", target_os = "none")))]
+                    #[cfg(all(target_arch = "wasm32", any(target_os = "unknown", target_os = "none", target_os = "emscripten")))]
                     extern "C" {
                         fn #unwrap_fn(ptr: u32) -> u32;
                     }
 
-                    #[cfg(not(all(target_arch = "wasm32", any(target_os = "unknown", target_os = "none"))))]
+                    #[cfg(not(all(target_arch = "wasm32", any(target_os = "unknown", target_os = "none", target_os = "emscripten"))))]
                     unsafe fn #unwrap_fn(_: u32) -> u32 {
                         panic!("cannot convert from JsValue outside of the Wasm target")
                     }
@@ -501,7 +501,7 @@ impl ToTokens for ast::StructField {
             #[automatically_derived]
             const _: () = {
                 #wasm_bindgen::__wbindgen_coverage! {
-                #[cfg_attr(all(target_arch = "wasm32", any(target_os = "unknown", target_os = "none")), no_mangle)]
+                #[cfg_attr(all(target_arch = "wasm32", any(target_os = "unknown", target_os = "none", target_os = "emscripten")), no_mangle)]
                 #[doc(hidden)]
                 pub unsafe extern "C" fn #getter(js: u32)
                     -> #wasm_bindgen::convert::WasmRet<<#ty as #wasm_bindgen::convert::IntoWasmAbi>::Abi>
@@ -540,7 +540,7 @@ impl ToTokens for ast::StructField {
         let (args, names) = splat(wasm_bindgen, &Ident::new("val", rust_name.span()), &abi);
 
         (quote! {
-            #[cfg(all(target_arch = "wasm32", any(target_os = "unknown", target_os = "none")))]
+            #[cfg(all(target_arch = "wasm32", any(target_os = "unknown", target_os = "none", target_os = "emscripten")))]
             #[automatically_derived]
             const _: () = {
                 #wasm_bindgen::__wbindgen_coverage! {
@@ -847,7 +847,7 @@ impl TryToTokens for ast::Export {
                 #wasm_bindgen::__wbindgen_coverage! {
                 #(#attrs)*
                 #[cfg_attr(
-                    all(target_arch = "wasm32", any(target_os = "unknown", target_os = "none")),
+                    all(target_arch = "wasm32", any(target_os = "unknown", target_os = "none", target_os = "emscripten")),
                     export_name = #export_name,
                 )]
                 pub unsafe extern "C" fn #generated_name(#(#args),*) -> #wasm_bindgen::convert::WasmRet<#projection::Abi> {
@@ -1124,11 +1124,11 @@ impl ToTokens for ast::ImportType {
                 impl JsCast for #rust_name {
                     fn instanceof(val: &JsValue) -> bool {
                         #[link(wasm_import_module = "__wbindgen_placeholder__")]
-                        #[cfg(all(target_arch = "wasm32", any(target_os = "unknown", target_os = "none")))]
+                        #[cfg(all(target_arch = "wasm32", any(target_os = "unknown", target_os = "none", target_os = "emscripten")))]
                         extern "C" {
                             fn #instanceof_shim(val: u32) -> u32;
                         }
-                        #[cfg(not(all(target_arch = "wasm32", any(target_os = "unknown", target_os = "none"))))]
+                        #[cfg(not(all(target_arch = "wasm32", any(target_os = "unknown", target_os = "none", target_os = "emscripten"))))]
                         unsafe fn #instanceof_shim(_: u32) -> u32 {
                             panic!("cannot check instanceof on non-wasm targets");
                         }
@@ -1838,12 +1838,12 @@ fn static_init(wasm_bindgen: &syn::Path, ty: &syn::Type, shim_name: &Ident) -> T
     };
     quote! {
         #[link(wasm_import_module = "__wbindgen_placeholder__")]
-        #[cfg(all(target_arch = "wasm32", any(target_os = "unknown", target_os = "none")))]
+        #[cfg(all(target_arch = "wasm32", any(target_os = "unknown", target_os = "none", target_os = "emscripten")))]
         extern "C" {
             fn #shim_name() -> #abi_ret;
         }
 
-        #[cfg(not(all(target_arch = "wasm32", any(target_os = "unknown", target_os = "none"))))]
+        #[cfg(not(all(target_arch = "wasm32", any(target_os = "unknown", target_os = "none", target_os = "emscripten"))))]
         unsafe fn #shim_name() -> #abi_ret {
             panic!("cannot access imported statics on non-wasm targets")
         }
@@ -1888,7 +1888,7 @@ impl<T: ToTokens> ToTokens for Descriptor<'_, T> {
         let attrs = &self.attrs;
         let wasm_bindgen = &self.wasm_bindgen;
         (quote! {
-            #[cfg(all(target_arch = "wasm32", any(target_os = "unknown", target_os = "none")))]
+            #[cfg(all(target_arch = "wasm32", any(target_os = "unknown", target_os = "none", target_os = "emscripten")))]
             #[automatically_derived]
             const _: () = {
                 #wasm_bindgen::__wbindgen_coverage! {
@@ -1916,14 +1916,14 @@ fn extern_fn(
     abi_ret: TokenStream,
 ) -> TokenStream {
     quote! {
-        #[cfg(all(target_arch = "wasm32", any(target_os = "unknown", target_os = "none")))]
+        #[cfg(all(target_arch = "wasm32", any(target_os = "unknown", target_os = "none", target_os = "emscripten")))]
         #(#attrs)*
         #[link(wasm_import_module = "__wbindgen_placeholder__")]
         extern "C" {
             fn #import_name(#(#abi_arguments),*) -> #abi_ret;
         }
 
-        #[cfg(not(all(target_arch = "wasm32", any(target_os = "unknown", target_os = "none"))))]
+        #[cfg(not(all(target_arch = "wasm32", any(target_os = "unknown", target_os = "none", target_os = "emscripten"))))]
         unsafe fn #import_name(#(#abi_arguments),*) -> #abi_ret {
             #(
                 drop(#abi_argument_names);

crates/cli-support/Cargo.toml

@@ -17,6 +17,7 @@ version = "0.2.100"
 anyhow = "1.0"
 base64 = "0.22"
 log = "0.4"
+regex = "1"
 rustc-demangle = "0.1.13"
 serde = { version = "1.0", features = ["derive"] }
 serde_json = "1.0"