Simon Zünd f96f93128c Reland "Implement top-level await for REPL mode" ... This is a reland of 5bddc0e142 The original CL was speculatively reverted as it was suspected to cause failures on the non-determinism bot. This was ultimately confirmed to not be the case, so this CL is safe to reland as-is. Original change's description: > Implement top-level await for REPL mode > > Design doc: bit.ly/v8-repl-mode > > This CL allows the usage of 'await' without wrapping code in an async > function when using REPL mode in global evaluate. REPL mode evaluate > is changed to *always* return a Promise. The resolve value of the > promise is the completion value of the REPL script. > > The implementation is based on two existing mechanisms: > - Similar to async functions, the content of a REPL script is > enclosed in a synthetic 'try' block. Any thrown error > is used to reject the Promise of the REPL script. > > - The content of the synthetic 'try' block is also re-written the > same way a normal script is. This is, artificial assignments to > a ".result" variable are inserted to simulate a completion > value. The difference for REPL scripts is, that ".result" is > used to resolve the Promise of the REPL script. > > - ".result" is not returned directly but wrapped in an object > literal: "{ .repl_result: .result}". This is done to prevent > resolved promises from being chained and resolved prematurely: > > > Promse.resolve(42); > > should evaluate to a promise, not 42. > > Bug: chromium:1021921 > Change-Id: I00a5aafd9126ca7c97d09cd8787a3aec2821a67f > Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1900464 > Reviewed-by: Yang Guo <yangguo@chromium.org> > Reviewed-by: Leszek Swirski <leszeks@chromium.org> > Reviewed-by: Toon Verwaest <verwaest@chromium.org> > Commit-Queue: Simon Zünd <szuend@chromium.org> > Cr-Commit-Position: refs/heads/master@{#65273} TBR: yangguo@chromium.org,verwaest@chromium.org Bug: chromium:1021921 Change-Id: I95c5dc17593161009a533188f91b4cd67234c32f Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1954388 Reviewed-by: Simon Zünd <szuend@chromium.org> Reviewed-by: Yang Guo <yangguo@chromium.org> Commit-Queue: Simon Zünd <szuend@chromium.org> Cr-Commit-Position: refs/heads/master@{#65360}		2019-12-06 10:13:00 +00:00
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bugs/harmony	[debug-wrapper] migrate some scope related tests	2016-12-14 07:20:33 +00:00
debug	Reland "Implement top-level await for REPL mode"	2019-12-06 10:13:00 +00:00
protocol	[debugger] basic test infrastructure for new debugger test api.	2016-10-21 06:38:05 +00:00
regress	Report real module in addition to fake scripts	2019-11-15 09:59:58 +00:00
wrapper	[debugger] Various break-related functionality in test wrapper	2016-10-28 08:18:34 +00:00
BUILD.gn	[build] Add data deps for d8 test suites	2018-03-26 13:44:58 +00:00
debugger.status	[debug] Revert to old line number behavior for new Function()	2019-11-28 12:01:39 +00:00
OWNERS	Use relative paths to OWNERS files	2019-08-12 13:52:52 +00:00
test-api.js	Reland "Implement top-level await for REPL mode"	2019-12-06 10:13:00 +00:00
testcfg.py	[test] Remove module pragma in favor of .mjs	2019-06-27 13:25:48 +00:00