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Support reference types in spec #49

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Support reference types in spec #49

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56 changes: 38 additions & 18 deletions document/js-api/index.bs
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Original file line number Diff line number Diff line change
Expand Up @@ -158,10 +158,12 @@ urlPrefix: https://webassembly.github.io/spec/core/; spec: WebAssembly; type: df
text: f32
text: f64
text: v128
url: syntax/types.html#syntax-reftype
url: syntax/types.html#reference-types
text: reftype
url: syntax/types.html#heap-types
text: funcref
text: externref
text: anyref
text: function element; url: exec/runtime.html#syntax-funcelem
text: import component; url: syntax/modules.html#imports
text: external value; url: exec/runtime.html#syntax-externval
Expand Down Expand Up @@ -951,16 +953,27 @@ The <dfn method for="Table">type()</dfn> method steps are:
<h3 id="globals">Globals</h3>

<pre class="idl">
enum ValueType {
enum PrimitiveType {
"i32",
"i64",
"f32",
"f64",
"v128",
"externref",
"funcref",
"anyfunc",
"v128"
};

enum RefTypeKind {
"func",
"extern",
"any"
};

dictionary RefType {
required RefTypeKind ref;
boolean nullable = true;
};

typedef (PrimitiveType or RefType) ValueType;

</pre>

Note: this type may be extended with additional cases in future versions of WebAssembly.
Expand Down Expand Up @@ -1012,23 +1025,30 @@ which can be simultaneously referenced by multiple {{Instance}} objects. Each
1. If |s| equals "f32", return [=f32=].
1. If |s| equals "f64", return [=f64=].
1. If |s| equals "v128", return [=v128=].
1. If |s| equals "funcref", return [=funcref=].
1. If |s| equals "anyfunc", return [=funcref=].
1. If |s| equals "externref", return [=externref=].
1. If |s| equals {{RefType}}, return [=v128=].
1. Let |nullable| be |s|.nullable.
1. Let |kind| be |s|.ref.
1. If |kind| equals "func", return [=reftype=]([=funcref=], |nullable|).
1. If |kind| equals "extern", return [=reftype=]([=externref=], |nullable|).
1. Otherwise throw an {{TypeError}} exception.
1. Assert: This step is not reached.
</div>

<div algorithm>

The algorithm <dfn abstract-op>FromValueType</dfn>(|s|) performs the following steps:

1. If |s| equals [=i32=], return "{{ValueType/i32}}".
1. If |s| equals [=i64=], return "{{ValueType/i64}}".
1. If |s| equals [=f32=], return "{{ValueType/f32}}".
1. If |s| equals [=f64=], return "{{ValueType/f64}}".
1. If |s| equals [=v128=], return "{{ValueType/v128}}".
1. If |s| equals [=funcref=], return "{{ValueType/funcref}}".
1. If |s| equals [=externref=], return "{{ValueType/externref}}".
1. If |s| equals [=i32=], return "{{PrimitiveType/i32}}".
1. If |s| equals [=i64=], return "{{PrimitiveType/i64}}".
1. If |s| equals [=f32=], return "{{PrimitiveType/f32}}".
1. If |s| equals [=f64=], return "{{PrimitiveType/f64}}".
1. If |s| equals [=v128=], return "{{PrimitiveType/v128}}".
1. If |s| equals [=reftype=],
1. Let |nullable| be |s|.|nullable|.
1. Let |heaptype| be |s|.|heaptype|.
1. If |heaptype| equals [=funcref=], return «[ "{{RefType/ref}}" → "{{RefTypeKind/func}}", "{{RefType/nullable}}" → |nullable| ]».
1. If |heaptype| equals [=externref=], return «[ "{{RefType/ref}}" → "{{RefTypeKind/extern}}", "{{RefType/nullable}}" → |nullable| ]».
1. Otherwise return «[ "{{RefType/ref}}" → "{{RefTypeKind/any}}", "{{RefType/nullable}}" → |nullable| ]».
1. Assert: This step is not reached.

</div>
Expand Down Expand Up @@ -1326,10 +1346,10 @@ The <dfn method for="Function">type()</dfn> method steps are:
1. Let |signature| be «[ "{{FunctionType/parameters}}" → |parameters|, "{{FunctionType/results}}" → |results| ]».
1. Let |param_types| be « ».
1. [=list/iterate|For each=] |p| of |parameters|,
1. [=list/Append=] [$ToValueType$](|p|) to |param_types|.
1. [=list/Append=] [=ToValueType=](|p|) to |param_types|.
1. Let |result_types| be « ».
1. [=list/iterate|For each=] |r| of |results|,
1. [=list/Append=] [$ToValueType$](|r|) to |result_types|.
1. [=list/Append=] [=ToValueType=](|r|) to |result_types|.
1. Let [|param_types|] → [|result_types|] be |functype|.
1. Let (|store|, |funcaddr|) be [=func_alloc=](|store|, |functype|, |callable|).
1. Return the result of creating [=a new Exported Function=] from |funcaddr|.
Expand Down
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