<?xml version="1.0" encoding="UTF-8" standalone="yes" ?>
<!DOCTYPE bugzilla SYSTEM "https://bugs.webkit.org/page.cgi?id=bugzilla.dtd">

<bugzilla version="5.0.4.1"
          urlbase="https://bugs.webkit.org/"
          
          maintainer="admin@webkit.org"
>

    <bug>
          <bug_id>220914</bug_id>
          
          <creation_ts>2021-01-25 03:48:14 -0800</creation_ts>
          <short_desc>[JSC] WebAssembly.Global should support Funcref and Externref</short_desc>
          <delta_ts>2021-01-30 11:51:23 -0800</delta_ts>
          <reporter_accessible>1</reporter_accessible>
          <cclist_accessible>1</cclist_accessible>
          <classification_id>1</classification_id>
          <classification>Unclassified</classification>
          <product>WebKit</product>
          <component>JavaScriptCore</component>
          <version>WebKit Nightly Build</version>
          <rep_platform>Unspecified</rep_platform>
          <op_sys>Unspecified</op_sys>
          <bug_status>RESOLVED</bug_status>
          <resolution>FIXED</resolution>
          
          <see_also>https://bugs.webkit.org/show_bug.cgi?id=221157</see_also>
          <bug_file_loc></bug_file_loc>
          <status_whiteboard></status_whiteboard>
          <keywords>InRadar</keywords>
          <priority>P2</priority>
          <bug_severity>Normal</bug_severity>
          <target_milestone>---</target_milestone>
          
          
          <everconfirmed>1</everconfirmed>
          <reporter name="Yusuke Suzuki">ysuzuki</reporter>
          <assigned_to name="Nobody">webkit-unassigned</assigned_to>
          <cc>chi187</cc>
    
    <cc>dbezhetskov</cc>
    
    <cc>ews-watchlist</cc>
    
    <cc>keith_miller</cc>
    
    <cc>mark.lam</cc>
    
    <cc>msaboff</cc>
    
    <cc>saam</cc>
    
    <cc>tzagallo</cc>
    
    <cc>webkit-bug-importer</cc>
    
    <cc>ysuzuki</cc>
          

      

      

      

          <comment_sort_order>oldest_to_newest</comment_sort_order>  
          <long_desc isprivate="0" >
    <commentid>1722013</commentid>
    <comment_count>0</comment_count>
    <who name="Yusuke Suzuki">ysuzuki</who>
    <bug_when>2021-01-25 03:48:14 -0800</bug_when>
    <thetext>https://webassembly.github.io/reference-types/js-api/index.html#dom-global-global</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1722014</commentid>
    <comment_count>1</comment_count>
    <who name="Yusuke Suzuki">ysuzuki</who>
    <bug_when>2021-01-25 03:50:03 -0800</bug_when>
    <thetext>Note,

1. Wasm::Global itself supports externref / funcref already.
2. But JS binding around WebAssembly.Global does not support it (e.g. new WebAssembly.Global({ type: &quot;externref&quot;, mutable: true });</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1722558</commentid>
    <comment_count>2</comment_count>
      <attachid>418433</attachid>
    <who name="Dmitry">dbezhetskov</who>
    <bug_when>2021-01-26 09:48:25 -0800</bug_when>
    <thetext>Created attachment 418433
Patch</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1722644</commentid>
    <comment_count>3</comment_count>
      <attachid>418433</attachid>
    <who name="Yusuke Suzuki">ysuzuki</who>
    <bug_when>2021-01-26 11:59:10 -0800</bug_when>
    <thetext>Comment on attachment 418433
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=418433&amp;action=review

r=me with comments.

&gt; Source/JavaScriptCore/wasm/js/WebAssemblyGlobalConstructor.cpp:146
&gt; +    RETURN_IF_EXCEPTION(throwScope, encodedJSValue());

Use `RETURN_IF_EXCEPTION(throwScope, {});` in newer code.

&gt; Source/JavaScriptCore/wasm/js/WebAssemblyGlobalConstructor.cpp:151
&gt; +        if (type == Wasm::Type::Funcref &amp;&amp; argument.isUndefined())
&gt; +            argument = jsNull();

Can we share this &quot;default value&quot; part with WasmTable etc.?

&gt; Source/JavaScriptCore/wasm/js/WebAssemblyGlobalConstructor.cpp:152
&gt; +        jsWebAssemblyGlobal-&gt;global()-&gt;set(globalObject, argument);

Insert `RETURN_IF_EXCEPTION(throwScope, { });` after calling a function which takes `globalObject` as a first parameter (this is a rough indicator of &quot;it can throw&quot;).

&gt; Source/JavaScriptCore/wasm/js/WebAssemblyGlobalConstructor.cpp:154
&gt; +    RELEASE_AND_RETURN(throwScope, JSValue::encode(jsWebAssemblyGlobal));

RELEASE_AND_RETURN is not necessary if the evaluated part will not throw. Let&apos;s use `return`.

&gt; JSTests/wasm/references/globals.js:42
&gt; +  assert.throws(() =&gt; new WebAssembly.Global({ value: &quot;anyfunc&quot;, mutable: true }, new Pelmen(calories)), WebAssembly.RuntimeError, &quot;Funcref must be an exported wasm function (evaluating &apos;new WebAssembly.Global({ value: \&quot;anyfunc\&quot;, mutable: true }, new Pelmen(calories))&apos;)&quot;);

Let&apos;s add a test, setting a wrong value via `.value = xxx`.</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1723629</commentid>
    <comment_count>4</comment_count>
      <attachid>418707</attachid>
    <who name="Dmitry">dbezhetskov</who>
    <bug_when>2021-01-28 23:44:20 -0800</bug_when>
    <thetext>Created attachment 418707
Patch</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1723794</commentid>
    <comment_count>5</comment_count>
      <attachid>418707</attachid>
    <who name="Yusuke Suzuki">ysuzuki</who>
    <bug_when>2021-01-29 11:09:14 -0800</bug_when>
    <thetext>Comment on attachment 418707
Patch

r=me</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1723809</commentid>
    <comment_count>6</comment_count>
    <who name="EWS">ews-feeder</who>
    <bug_when>2021-01-29 11:26:42 -0800</bug_when>
    <thetext>Committed r272071: &lt;https://trac.webkit.org/changeset/272071&gt;

All reviewed patches have been landed. Closing bug and clearing flags on attachment 418707.</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1723810</commentid>
    <comment_count>7</comment_count>
    <who name="Radar WebKit Bug Importer">webkit-bug-importer</who>
    <bug_when>2021-01-29 11:27:14 -0800</bug_when>
    <thetext>&lt;rdar://problem/73763872&gt;</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1724045</commentid>
    <comment_count>8</comment_count>
    <who name="Yusuke Suzuki">ysuzuki</who>
    <bug_when>2021-01-30 10:50:01 -0800</bug_when>
    <thetext>Oops! ::set should not be used since mutability can be an immutable. In that case, assertion hits. https://results.webkit.org/?suite=layout-tests&amp;test=imported%2Fw3c%2Fweb-platform-tests%2Fwasm%2Fjsapi%2Fglobal%2Ftype.tentative.any.html

I&apos;ll fix.</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1724054</commentid>
    <comment_count>9</comment_count>
    <who name="Yusuke Suzuki">ysuzuki</who>
    <bug_when>2021-01-30 11:51:23 -0800</bug_when>
    <thetext>Committed r272119: &lt;https://trac.webkit.org/changeset/272119&gt;</thetext>
  </long_desc>
      
          <attachment
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            <attachid>418433</attachid>
            <date>2021-01-26 09:48:25 -0800</date>
            <delta_ts>2021-01-28 23:44:13 -0800</delta_ts>
            <desc>Patch</desc>
            <filename>bug-220914-20210126204824.patch</filename>
            <type>text/plain</type>
            <size>6403</size>
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          </attachment>
          <attachment
              isobsolete="0"
              ispatch="1"
              isprivate="0"
          >
            <attachid>418707</attachid>
            <date>2021-01-28 23:44:20 -0800</date>
            <delta_ts>2021-01-29 11:26:43 -0800</delta_ts>
            <desc>Patch</desc>
            <filename>bug-220914-20210129104419.patch</filename>
            <type>text/plain</type>
            <size>11073</size>
            <attacher name="Dmitry">dbezhetskov</attacher>
            
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          </attachment>
      

    </bug>

</bugzilla>