161948 2016-09-13 22:53:16 -0700 TaggedTemplateString function calls should emit tail position calls 2016-09-14 10:50:24 -0700 1 1 1 Unclassified WebKit JavaScriptCore WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED P2 Normal --- 1 joepeck joepeck commit-queue joepeck keith_miller mark.lam msaboff saam ysuzuki oldest_to_newest 1229455 0 joepeck 2016-09-13 22:53:16 -0700 Summary: TaggedTemplateString function calls should emit tail position calls. Test: <script> "use strict"; function tag() { debugger; return "test"; } function templateTagPath() { return tag`test`; } function testTemplateTagPath() { return templateTagPath(); } function normalPath() { return tag(); } function testNormalPath() { return normalPath(); } testNormalPath(); testTemplateTagPath(); </script> Steps to reproduce: 1. Inspect test page 2. Reload (to hit breakpoints) 3. First breakpoint is in normal function call path => normalPath and testNormalPath are shown to be tail deleted frames in the debugger sidebar 4. Continue 5. Second pause is in tagged template string function call path => testTemplateTagPath is shown to be tail deleted but templateTagPath is not. It should be! Spec: https://tc39.github.io/ecma262/#sec-tagged-templates-runtime-semantics-evaluation > MemberExpression:MemberExpressionTemplateLiteral > > 1. Let tagRef be the result of evaluating MemberExpression. > 2. Let thisCall be this MemberExpression. > 3. Let tailCall be IsInTailPosition(thisCall). > 4. Return ? EvaluateCall(tagRef, TemplateLiteral, tailCall). > > CallExpression:CallExpressionTemplateLiteral > > 1. Let tagRef be the result of evaluating CallExpression. > 2. Let thisCall be this CallExpression. > 3. Let tailCall be IsInTailPosition(thisCall). > 4. Return ? EvaluateCall(tagRef, TemplateLiteral, tailCall). 1229469 1 joepeck 2016-09-14 00:35:08 -0700 Should be as simple as changing the emitCall to emitCallInTailPosition. I'm doing a build now. 1229484 2 joepeck 2016-09-14 01:25:59 -0700 This is tested by: test262/test/language/expressions/tagged-template/tco-call.js Not sure if I need to do anything about that. I'll just add to the existing simple test for checking tail calls. 1229485 3 288786 joepeck 2016-09-14 01:26:41 -0700 Created attachment 288786 [PATCH] Proposed Fix 1229486 4 288786 joepeck 2016-09-14 01:28:47 -0700 Comment on attachment 288786 [PATCH] Proposed Fix I should be able to update the test262.yaml if I can verify the single test succeeds now. 1229489 5 288787 joepeck 2016-09-14 01:34:56 -0700 Created attachment 288787 [PATCH] Proposed Fix 1229626 6 288787 ysuzuki 2016-09-14 10:28:59 -0700 Comment on attachment 288787 [PATCH] Proposed Fix r=me 1229635 7 288787 commit-queue 2016-09-14 10:50:20 -0700 Comment on attachment 288787 [PATCH] Proposed Fix Clearing flags on attachment: 288787 Committed r205916: <http://trac.webkit.org/changeset/205916> 1229636 8 commit-queue 2016-09-14 10:50:24 -0700 All reviewed patches have been landed. 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