- 10 Oct, 2018 1 commit
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Benedikt Meurer authored
This change introduces new intrinsics used to desugar async functions in the Parser and the BytecodeGenerator, namely we introduce a new %_AsyncFunctionEnter intrinsic that constructs the generator object for the async function (and in the future will also create the outer promise for the async function). This generator object is internal and never escapes to user code, plus since async functions don't have a "prototype" property, we can just a single map here instead of tracking the prototype/initial_map on every async function. This saves one word per async function plus one initial_map per async function that was invoked at least once. We also introduce two new intrinsics %_AsyncFunctionReject, which rejects the outer promise with the caught exception, and another %_AsyncFunctionResolve, which resolves the outer promise with the right hand side of the `return` statement. These functions also perform the DevTools part of the job (aka popping from the promise stack and sending the debug event). This allows us to get rid of the implicit try-finally from async functions completely; because the finally block only called to the %AsyncFunctionPromiseRelease builtin, which was used to inform DevTools. In essence we now turn an async function like ```js async function f(x) { return await bar(x); } ``` into something like this (in Parser and BytecodeGenerator respectively): ``` function f(x) { .generator_object = %_AsyncFunctionEnter(.closure, this); .promise = %AsyncFunctionCreatePromise(); try { .tmp = await bar(x); return %_AsyncFunctionResolve(.promise, .tmp); } catch (e) { return %_AsyncFunctionReject(.promise, e); } } ``` Overall the bytecode for async functions gets significantly shorter already (and will get even shorter once we put the outer promise into the async function generator object). For example the bytecode for a simple async function ```js async function f(x) { return await x; } ``` goes from 175 bytes to 110 bytes (a ~38% reduction in size), which is in particular due to the simplification around the try-finally removal. Overall this seems to improve the doxbee-async-es2017-native test by around 2-3%. On the test case mentioned in v8:8276 we go from 1124ms to 441ms, which corresponds to a 60% reduction in total execution time! Tbr: marja@chromium.org Bug: v8:7253, v8:7522, v8:8276 Cq-Include-Trybots: luci.chromium.try:linux_chromium_headless_rel;luci.chromium.try:linux_chromium_rel_ng;master.tryserver.blink:linux_trusty_blink_rel Change-Id: Id29dc92de7490b387ff697860c900cee44c9a7a4 Reviewed-on: https://chromium-review.googlesource.com/c/1269041 Commit-Queue: Benedikt Meurer <bmeurer@chromium.org> Reviewed-by: Benedikt Meurer <bmeurer@chromium.org> Reviewed-by: Sathya Gunasekaran <gsathya@chromium.org> Reviewed-by: Ross McIlroy <rmcilroy@chromium.org> Reviewed-by: Jaroslav Sevcik <jarin@chromium.org> Reviewed-by: Maya Lekova <mslekova@chromium.org> Reviewed-by: Yang Guo <yangguo@chromium.org> Cr-Commit-Position: refs/heads/master@{#56502}
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- 23 Jun, 2017 1 commit
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Michael Starzinger authored
This removes the --turbo flag and solely relies on the filter pattern provided via --turbo-filter when deciding whether to use TurboFan. Note that disabling optimization wholesale can still be done with --no-opt, which should be used in favor of --no-turbo everywhere. Also note that this contains semantic changes to the TurboFan activation criteria. We respect the filter pattern more stringently and no longer activate TurboFan just because the source contains patterns forcing use of Ignition via {AstNumberingVisitor::DisableFullCodegenAndCrankshaft}. R=rmcilroy@chromium.org BUG=v8:6408 Change-Id: I0c855f6a62350eb62283a3431c8cc1baa750950e Reviewed-on: https://chromium-review.googlesource.com/528121Reviewed-by: Jaroslav Sevcik <jarin@chromium.org> Reviewed-by: Michael Stanton <mvstanton@chromium.org> Reviewed-by: Ross McIlroy <rmcilroy@chromium.org> Commit-Queue: Michael Starzinger <mstarzinger@chromium.org> Cr-Commit-Position: refs/heads/master@{#46167}
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- 10 Jan, 2017 1 commit
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adamk authored
It shipped with Chrome 55 stable. R=littledan@chromium.org Review-Url: https://codereview.chromium.org/2621173002 Cr-Commit-Position: refs/heads/master@{#42203}
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- 08 Nov, 2016 1 commit
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yangguo authored
R=jgruber@chromium.org, mstarzinger@chromium.org BUG=v8:5610 Review-Url: https://codereview.chromium.org/2482133002 Cr-Commit-Position: refs/heads/master@{#40827}
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- 07 Nov, 2016 2 commits
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jgruber authored
Revert of [debugger] Migrate more debugger tests to inspector (patchset #2 id:20001 of https://codereview.chromium.org/2480223002/ ) Reason for revert: http://build.chromium.org/p/client.v8/builders/V8%20Linux%20gcc%204.8/builds/9724 Original issue's description: > [debugger] Migrate more debugger tests to inspector > > This moves all tests currently working with the inspector debugger wrapper to > test/debugger. > > BUG=v8:5530 TBR=yangguo@chromium.org # Skipping CQ checks because original CL landed less than 1 days ago. NOPRESUBMIT=true NOTREECHECKS=true NOTRY=true BUG=v8:5530 Review-Url: https://codereview.chromium.org/2480283002 Cr-Commit-Position: refs/heads/master@{#40805}
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jgruber authored
This moves all tests currently working with the inspector debugger wrapper to test/debugger. BUG=v8:5530 Review-Url: https://codereview.chromium.org/2480223002 Cr-Commit-Position: refs/heads/master@{#40804}
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- 03 Jun, 2016 1 commit
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yangguo authored
R=*bmeurer@chromium.org, caitpotter88@gmail.com, *littledan@chromium.org, *ulan@chromium.org BUG=v8:4483 Review-Url: https://codereview.chromium.org/2033223003 Cr-Commit-Position: refs/heads/master@{#36718}
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