Update index.bs

Tidy up punctuation.

Author: fgmccabe

document/js-api/index.bs

@@ -1135,7 +1135,7 @@ This slot holds a [=function address=] relative to the [=surrounding agent=]'s [
     1. Let |map| be the [=surrounding agent=]'s associated [=Exported Function cache=].
     1. If |map|[|funcaddr|] [=map/exists=],
         1. Return |map|[|funcaddr|].
-    1. Let |steps| be "[=call an Exported Function|call the Exported Function=] |funcaddr| with arguments."
+    1. Let |steps| be "[=call an Exported Function|call the Exported Function=] |funcaddr| with arguments.".
     1. Let |realm| be the [=current Realm=].
     1. Let |store| be the [=surrounding agent=]'s [=associated store=].
     1. Let |functype| be [=func_type=](|store|, |funcaddr|).
@@ -1171,7 +1171,7 @@ This slot holds a [=function address=] relative to the [=surrounding agent=]'s [
     1. Let (|store|, |ret|) be the result of [=func_invoke=](|store|, |funcaddr|, |args|).
     1. Set the [=surrounding agent=]'s [=associated store=] to |store|.
     1. If |ret| is [=error=], throw an exception. This exception should be a WebAssembly {{RuntimeError}} exception, unless otherwise indicated by <a href="#errors">the WebAssembly error mapping</a>.
-    1. If |ret| is [=THROW=] [=ref.exn=] |exnaddr|, then
+    1. If |ret| is [=THROW=] [=ref.exn=] |exnaddr|, then:
         1. Let |tagaddr| be [=exn_tag=](|store|, |exnaddr|).
         1. Let |payload| be [=exn_read=](|store|, |exnaddr|).
         1. Let |jsTagAddr| be the result of [=get the JavaScript exception tag |getting the JavaScript exception tag=].
@@ -1200,7 +1200,7 @@ Note: Exported Functions do not have a \[[Construct]] method and thus it is not
     1. Let |jsArguments| be « ».
     1. [=list/iterate|For each=] |arg| of |arguments|,
         1. [=list/Append=] [=!=] [=ToJSValue=](|arg|) to |jsArguments|.
-    1. Return |jsArguments|
+    1. Return |jsArguments|.
 </div>
 
 <div algorithm>
@@ -1242,7 +1242,7 @@ Note: Exported Functions do not have a \[[Construct]] method and thus it is not
         1. [=Prepare to run script=] with |relevant settings|.
         1. [=Prepare to run a callback=] with |stored settings|.
         1. Let [|parameters|] → [|resultTypes|] be |functype|.
-        1. Let |jsArguments| be the result of [=coerce WebAssembly arguments=](|parameters|,|arguments|)
+        1. Let |jsArguments| be the result of [=coerce WebAssembly arguments=](|parameters|,|arguments|).
         1. Let |result| be the result of Completion([$Call$](|func|, undefined, |jsArguments|)).
         1. [=Clean up after running a callback=] with |stored settings|.
         1. [=Clean up after running script=] with |relevant settings|.
@@ -1251,20 +1251,24 @@ Note: Exported Functions do not have a \[[Construct]] method and thus it is not
         1. If |result|.\[[Type]] is <emu-const>normal</emu-const>, then:
             1. Return the result of performing [=coerce a JavaScript return=] on |resultTypes| and |ret|.
         1. If |result|.\[[Type]] is <emu-const>throw</emu-const>, then:
-            1. Let |v| be |result|.\[[Value]].
-            1. If |v| [=implements=] {{Exception}},
-                1. Let |address| be |v|.\[[Address]].
-            1. Otherwise,
-                1. Let |type| be the result of [=get the JavaScript exception tag |getting the JavaScript exception tag=].
-                1. Let |payload| be [=!=] [=ToWebAssemblyValue=](|v|, [=externref=]).
-                1. Let (|store|, |address|) be [=exn_alloc=](|store|, |type|, « |payload| »).
-                1. Set the [=surrounding agent=]'s [=associated store=] to |store|.
-            1. Execute the WebAssembly instructions ([=ref.exn=] |address|) ([=throw_ref=]).
+            1. Perform [=throw a JavaScript exception|throw the JavaScript exception=] |result|.\[[Value]].
     1. Let (|store|, |funcaddr|) be [=func_alloc=](|store|, |functype|, |hostfunc|).
     1. Set the [=surrounding agent=]'s [=associated store=] to |store|.
     1. Return |funcaddr|.
 </div>
 
+<div algorithm>
+  To <dfn>throw a JavaScript exception</dfn> from the JavaScript object |v|, perform the following steps:
+    1. If |v| [=implements=] {{Exception}},
+          1. Let |address| be |v|.\[[Address]].
+    1. Otherwise,
+          1. Let |type| be the result of [=get the JavaScript exception tag |getting the JavaScript exception tag=].
+          1. Let |payload| be [=!=] [=ToWebAssemblyValue=](|v|, [=externref=]).
+          1. Let (|store|, |address|) be [=exn_alloc=](|store|, |type|, « |payload| »).
+          1. Set the [=surrounding agent=]'s [=associated store=] to |store|.
+    1. Execute the WebAssembly instructions ([=ref.exn=] |address|) ([=throw_ref=]).
+</div>
+
 <div algorithm>
 The algorithm <dfn>ToJSValue</dfn>(|w|) coerces a [=WebAssembly value=] to a JavaScript value by performing the following steps:
 
@@ -1294,7 +1298,6 @@ The algorithm <dfn>ToJSValue</dfn>(|w|) coerces a [=WebAssembly value=] to a Jav
 1. If |w| is of the form [=ref.host=] |hostaddr|, return the result of [=retrieving a host value=] from |hostaddr|.
 1. If |w| is of the form [=ref.extern=] |ref|, return [=ToJSValue=](|ref|).
 
-
 Note: Number values which are equal to NaN may have various observable NaN payloads; see [$NumericToRawBytes$] for details.
 </div>
 
@@ -1327,7 +1330,7 @@ The algorithm <dfn>ToWebAssemblyValue</dfn>(|v|, |type|) coerces a JavaScript va
         1. Let |n| be an implementation-defined integer such that [=canon=]<sub>32</sub> ≤ |n| < 2<sup>[=signif=](32)</sup>.
         1. Let |f32| be [=nan=](n).
     1. Otherwise,
-        1. Let |f32| be |number| rounded to the nearest representable value using IEEE 754-2008 round to nearest, ties to even mode. [[IEEE-754]]
+        \1.
     1. Return [=f32.const=] |f32|.
 1. If |type| is [=f64=],
     1. Let |number| be [=?=] [$ToNumber$](|v|).
@@ -1427,7 +1430,7 @@ interface Suspending {
   The algorithm to <dfn>evaluate a Promising function</dfn>(|promise|, |funcaddr|, |arguments|) consists of the following steps:
     1. Let |store| be the [=surrounding agent=]'s [=associated store=].
     1. Let |functype| be [=func_type=](|store|, |funcaddr|).
-    1. Let |args| be the result of [=coerce JavaScript arguments|coercing arguments=] (|functype|,|arguments|)
+    1. Let |args| be the result of [=coerce JavaScript arguments|coercing arguments=] (|functype|,|arguments|).
     1. Let |map| be the [=surrounding agent=]'s associated [=Execution Context Status map=].
     1. Let |ec| be the currently executing [=execution context=], i.e., the [=execution context=] that is at the top of the [=surrounding agent=]'s current [=execution context stack=].
     1. Assert: |map| does not contain any entry for |ec|.
@@ -1439,8 +1442,8 @@ interface Suspending {
     1. If |result| is [=error=], throw an exception. This exception must be a WebAssembly {{RuntimeError}} exception, unless otherwise indicated by <a href="#errors">the WebAssembly error mapping</a>.
     1. Otherwise, if |result| is of the form [=throw=] exnaddr,
         1. [=Reject=] |promise| with |result|.
-    1. Otherwise, 
-        1. Assert: |result| is a [=list=] of WebAssembly values
+    1. Otherwise,
+        1. Assert: |result| is a [=list=] of WebAssembly values.
         1. Let |outArity| be the [=list/size=] of |result|.
         1. If |outArity| is 0, return undefined.
         1. Otherwise, if |outArity| is 1, let |jsReturnValue| be [=ToJSValue=](|result|[0]).
@@ -1738,7 +1741,7 @@ constructor steps are:
     1. If |resultType| is [=v128=] or [=exnref=],
         1. Throw a {{TypeError}}.
     1. [=list/Append=] [=?=] [=ToWebAssemblyValue=](|value|, |resultType|) to |wasmPayload|.
-1. Let (|store|, |exceptionAddr|) be [=exn_alloc=](|store|, |exceptionTag|.\[[Address]], |wasmPayload|)
+1. Let (|store|, |exceptionAddr|) be [=exn_alloc=](|store|, |exceptionTag|.\[[Address]], |wasmPayload|).
 1. Set the [=surrounding agent=]'s [=associated store=] to |store|.
 1. [=initialize an Exception object|Initialize=] **this** from |exceptionAddr|.
 1. If |options|["traceStack"] is true,
@@ -1794,7 +1797,7 @@ first use and cached. It always has the [=tag type=] « [=externref=] » → «
 To <dfn>get the JavaScript exception tag</dfn>, perform the following steps:
 
     1. If the [=surrounding agent=]'s associated [=JavaScript exception tag=] has been initialized,
-        1. return the [=surrounding agent=]'s associated [=JavaScript exception tag=]
+        1. return the [=surrounding agent=]'s associated [=JavaScript exception tag=].
     1. Let |store| be the [=surrounding agent=]'s [=associated store=].
     1. Let (|store|, |tagAddress|) be [=tag_alloc=](|store|, « [=externref=] » → « »).
     1. Set the current agent's [=associated store=] to |store|.