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<p>Hi Levente,</p>
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<p>> <span style="font-size: 12pt;">Returning from inside a block has some extra costs. You can achieve the </span><span style="font-size: 12pt;">same thing without the overhead by returning what #ensure: returns:</span></p>
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<div class="_rp_T4" id="Item.MessagePartBody">Wow, thanks for the hint! I made some quick measurements and the results were surprising:</div>
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<div>c := Object newSubclass.</div>
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<div>c compile: 'foo ^ [2 + 3] ensure: []'.</div>
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<div>c compile: 'bar [^ 2 + 3] ensure: []'.</div>
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<div>o := c new.</div>
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<div>[o foo] bench. "60 ns"</div>
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<div>[o bar] bench. "700 ns"</div>
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What's the reason? The second version calls #methodReturnTop, why is this so expensive? From my naive understanding, one call to #<span>findNextUnwindContextUpTo: should not be significantly slower than two calls to #resume:?</span></div>
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<span></span>However, it's interesting ... Will patch this commit soon.</div>
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Best,</div>
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Christoph<br>
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<div id="x_divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>Von:</b> Squeak-dev <squeak-dev-bounces@lists.squeakfoundation.org> im Auftrag von Levente Uzonyi <leves@caesar.elte.hu><br>
<b>Gesendet:</b> Dienstag, 4. Februar 2020 13:33 Uhr<br>
<b>An:</b> squeak-dev@lists.squeakfoundation.org<br>
<b>Betreff:</b> Re: [squeak-dev] The Inbox: System-ct.1133.mcz</font>
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<font size="2"><span style="font-size:10pt;">
<div class="PlainText">Hi Christoph,<br>
<br>
On Mon, 3 Feb 2020, commits@source.squeak.org wrote:<br>
<br>
> Christoph Thiede uploaded a new version of System to project The Inbox:<br>
> <a href="http://source.squeak.org/inbox/System-ct.1133.mcz" id="LPlnk582823" previewremoved="true">
http://source.squeak.org/inbox/System-ct.1133.mcz</a><br>
><br>
> ==================== Summary ====================<br>
><br>
> Name: System-ct.1133<br>
> Author: ct<br>
> Time: 3 February 2020, 11:55:06.856675 pm<br>
> UUID: bd5c789a-39d3-574b-aa2a-0f900b3a8009<br>
> Ancestors: System-cmm.1131<br>
><br>
> Fix execution-around pattern to forward return value in some during methods<br>
><br>
> So that<br>
> Utilities useAuthorName: 'Squeak' during: [Utilities authorName]<br>
> yields<br>
> 'Squeak'<br>
> but not<br>
> Utilities.<br>
><br>
> =============== Diff against System-cmm.1131 ===============<br>
><br>
> Item was changed:<br>
> ----- Method: Preferences class>>setFlag:toValue:during: (in category 'get/set - flags') -----<br>
> setFlag: prefSymbol toValue: aBoolean during: aBlock<br>
> "Set the flag to the given value for the duration of aBlock"<br>
><br>
> (self valueOfFlag: prefSymbol) in: [:previous |<br>
> self setFlag: prefSymbol toValue: aBoolean.<br>
> + ^ aBlock ensure: [self setFlag: prefSymbol toValue: previous]].!<br>
> - aBlock ensure: [self setFlag: prefSymbol toValue: previous]].!<br>
><br>
> Item was changed:<br>
> ----- Method: Preferences class>>setPreference:toValue:during: (in category 'get/set') -----<br>
> setPreference: prefSymbol toValue: anObject during: aBlock<br>
><br>
> (self valueOfPreference: prefSymbol) in: [:previous |<br>
> self setPreference: prefSymbol toValue: anObject.<br>
> + ^ aBlock ensure: [self setPreference: prefSymbol toValue: previous]]!<br>
> - aBlock ensure: [self setPreference: prefSymbol toValue: previous]].!<br>
><br>
> Item was changed:<br>
> ----- Method: Utilities class>>useAuthorInitials:during: (in category 'identification') -----<br>
> useAuthorInitials: temporaryAuthorInitials during: aBlock<br>
><br>
> | originalAuthorInitials |<br>
> originalAuthorInitials := AuthorInitials.<br>
> + [ AuthorInitials := temporaryAuthorInitials.<br>
> + ^ aBlock value ]<br>
<br>
Returning from inside a block has some extra costs. You can achieve the <br>
same thing without the overhead by returning what #ensure: returns:<br>
<br>
^[ AuthorInitials := temporaryAuthorInitials.<br>
aBlock value ]<br>
<br>
<br>
Levente<br>
<br>
> + [ AuthorInitials := temporaryAuthorInitials.<br>
> + ^ aBlock value ]<br>
<br>
<br>
> - [ <br>
> - AuthorInitials := temporaryAuthorInitials.<br>
> - aBlock value ]<br>
> ensure: [ AuthorInitials := originalAuthorInitials ]<br>
> !<br>
><br>
> Item was changed:<br>
> ----- Method: Utilities class>>useAuthorName:during: (in category 'identification') -----<br>
> useAuthorName: temporaryAuthorName during: aBlock<br>
><br>
> | originalAuthorName |<br>
> originalAuthorName := AuthorName.<br>
> + [ AuthorName := temporaryAuthorName.<br>
> + ^ aBlock value ]<br>
> - [ <br>
> - AuthorName := temporaryAuthorName.<br>
> - aBlock value ]<br>
> ensure: [ AuthorName := originalAuthorName ]<br>
> !<br>
<br>
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