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1 // Copyright 2016 the V8 project authors. All rights reserved. | 1 // Copyright 2016 the V8 project authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 (function(global, utils, extrasUtils) { | 5 (function(global, utils, extrasUtils) { |
6 | 6 |
7 "use strict"; | 7 "use strict"; |
8 | 8 |
9 %CheckIsBootstrapping(); | 9 %CheckIsBootstrapping(); |
10 | 10 |
11 // ------------------------------------------------------------------- | 11 // ------------------------------------------------------------------- |
12 // Imports | 12 // Imports |
13 | 13 |
14 var AsyncFunctionNext; | 14 var AsyncFunctionNext; |
15 var AsyncFunctionThrow; | 15 var AsyncFunctionThrow; |
16 var CreateInternalPromiseCapability; | 16 var CreateInternalPromiseCapability; |
17 var PromiseCreate; | 17 var PromiseCreate; |
18 var PromiseNextMicrotaskID; | 18 var PromiseNextMicrotaskID; |
19 var RejectPromise; | 19 var RejectPromise; |
20 var ResolvePromise; | |
21 | 20 |
22 utils.Import(function(from) { | 21 utils.Import(function(from) { |
23 AsyncFunctionNext = from.AsyncFunctionNext; | 22 AsyncFunctionNext = from.AsyncFunctionNext; |
24 AsyncFunctionThrow = from.AsyncFunctionThrow; | 23 AsyncFunctionThrow = from.AsyncFunctionThrow; |
25 CreateInternalPromiseCapability = from.CreateInternalPromiseCapability; | 24 CreateInternalPromiseCapability = from.CreateInternalPromiseCapability; |
26 PromiseCreate = from.PromiseCreate; | 25 PromiseCreate = from.PromiseCreate; |
27 RejectPromise = from.RejectPromise; | 26 RejectPromise = from.RejectPromise; |
28 ResolvePromise = from.ResolvePromise; | |
29 }); | 27 }); |
30 | 28 |
31 var promiseAsyncStackIDSymbol = | 29 var promiseAsyncStackIDSymbol = |
32 utils.ImportNow("promise_async_stack_id_symbol"); | 30 utils.ImportNow("promise_async_stack_id_symbol"); |
33 var promiseHandledBySymbol = | 31 var promiseHandledBySymbol = |
34 utils.ImportNow("promise_handled_by_symbol"); | 32 utils.ImportNow("promise_handled_by_symbol"); |
35 var promiseForwardingHandlerSymbol = | 33 var promiseForwardingHandlerSymbol = |
36 utils.ImportNow("promise_forwarding_handler_symbol"); | 34 utils.ImportNow("promise_forwarding_handler_symbol"); |
37 var promiseHandledHintSymbol = | 35 var promiseHandledHintSymbol = |
38 utils.ImportNow("promise_handled_hint_symbol"); | 36 utils.ImportNow("promise_handled_hint_symbol"); |
39 var promiseHasHandlerSymbol = | |
40 utils.ImportNow("promise_has_handler_symbol"); | |
41 | 37 |
42 // ------------------------------------------------------------------- | 38 // ------------------------------------------------------------------- |
43 | 39 |
44 function PromiseCastResolved(value) { | 40 function PromiseCastResolved(value) { |
45 // TODO(caitp): This is non spec compliant. See v8:5694. | 41 // TODO(caitp): This is non spec compliant. See v8:5694. |
46 if (%is_promise(value)) { | 42 if (%is_promise(value)) { |
47 return value; | 43 return value; |
48 } else { | 44 } else { |
49 var promise = PromiseCreate(); | 45 var promise = PromiseCreate(); |
50 ResolvePromise(promise, value); | 46 %promise_resolve(promise, value); |
51 return promise; | 47 return promise; |
52 } | 48 } |
53 } | 49 } |
54 | 50 |
55 // ES#abstract-ops-async-function-await | 51 // ES#abstract-ops-async-function-await |
56 // AsyncFunctionAwait ( value ) | 52 // AsyncFunctionAwait ( value ) |
57 // Shared logic for the core of await. The parser desugars | 53 // Shared logic for the core of await. The parser desugars |
58 // await awaited | 54 // await awaited |
59 // into | 55 // into |
60 // yield AsyncFunctionAwait{Caught,Uncaught}(.generator, awaited, .promise) | 56 // yield AsyncFunctionAwait{Caught,Uncaught}(.generator, awaited, .promise) |
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83 // create a similar memory leak, and it does not matter what | 79 // create a similar memory leak, and it does not matter what |
84 // sort of rejection this intermediate Promise becomes. | 80 // sort of rejection this intermediate Promise becomes. |
85 return; | 81 return; |
86 } | 82 } |
87 | 83 |
88 // Just forwarding the exception, so no debugEvent for throwawayCapability. | 84 // Just forwarding the exception, so no debugEvent for throwawayCapability. |
89 var throwawayCapability = CreateInternalPromiseCapability(); | 85 var throwawayCapability = CreateInternalPromiseCapability(); |
90 | 86 |
91 // The Promise will be thrown away and not handled, but it shouldn't trigger | 87 // The Promise will be thrown away and not handled, but it shouldn't trigger |
92 // unhandled reject events as its work is done | 88 // unhandled reject events as its work is done |
93 SET_PRIVATE(throwawayCapability.promise, promiseHasHandlerSymbol, true); | 89 %PromiseMarkAsHandled(throwawayCapability.promise); |
94 | 90 |
95 if (DEBUG_IS_ACTIVE) { | 91 if (DEBUG_IS_ACTIVE) { |
96 if (%is_promise(awaited)) { | 92 if (%is_promise(awaited)) { |
97 // Mark the reject handler callback to be a forwarding edge, rather | 93 // Mark the reject handler callback to be a forwarding edge, rather |
98 // than a meaningful catch handler | 94 // than a meaningful catch handler |
99 SET_PRIVATE(onRejected, promiseForwardingHandlerSymbol, true); | 95 SET_PRIVATE(onRejected, promiseForwardingHandlerSymbol, true); |
100 } | 96 } |
101 | 97 |
102 // Mark the dependency to outerPromise in case the throwaway Promise is | 98 // Mark the dependency to outerPromise in case the throwaway Promise is |
103 // found on the Promise stack | 99 // found on the Promise stack |
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162 | 158 |
163 %InstallToContext([ | 159 %InstallToContext([ |
164 "async_function_await_caught", AsyncFunctionAwaitCaught, | 160 "async_function_await_caught", AsyncFunctionAwaitCaught, |
165 "async_function_await_uncaught", AsyncFunctionAwaitUncaught, | 161 "async_function_await_uncaught", AsyncFunctionAwaitUncaught, |
166 "reject_promise_no_debug_event", RejectPromiseNoDebugEvent, | 162 "reject_promise_no_debug_event", RejectPromiseNoDebugEvent, |
167 "async_function_promise_create", AsyncFunctionPromiseCreate, | 163 "async_function_promise_create", AsyncFunctionPromiseCreate, |
168 "async_function_promise_release", AsyncFunctionPromiseRelease, | 164 "async_function_promise_release", AsyncFunctionPromiseRelease, |
169 ]); | 165 ]); |
170 | 166 |
171 }) | 167 }) |
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