Implement foreign export javascript#492
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The parser already accepted it; the calling convention was dropped in
Desugar. It now reaches makeFFI (an FE/FEJS marker pair, and an
IsJavascript flag through the export table), where a javascript export
differs from a ccall one in two ways: the generated wrapper is
EMSCRIPTEN_KEEPALIVE, so it is a wasm export without any
EXPORTED_FUNCTIONS listing, and the type table also allows Bool,
marshalled by new mhs_from_Bool/mhs_to_Bool runtime adapters (a Bool
is the K (False) or A (True) combinator, not an int node). Compile a
module with -c, link with emcc, and JS calls the exports directly:
m._mhs_init();
m._addOne(41);
A define-empty fallback keeps the generated C compiling natively.
Tested by testforexpjs (opt-in: needs emcc and node).
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The parser already accepted it; the calling convention was dropped in Desugar. It now reaches makeFFI (an FE/FEJS marker pair, and an IsJavascript flag through the export table), where a javascript export differs from a ccall one in two ways: the generated wrapper is EMSCRIPTEN_KEEPALIVE, so it is a wasm export without any EXPORTED_FUNCTIONS listing, and the type table also allows Bool, marshalled by new mhs_from_Bool/mhs_to_Bool runtime adapters (a Bool is the K (False) or A (True) combinator, not an int node). Compile a module with -c, link with emcc, and JS calls the exports directly:
A define-empty fallback keeps the generated C compiling natively. Tested by testforexpjs (opt-in: needs emcc and node).