1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
|
// Copyright 2019 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include 'src/builtins/builtins-promise.h'
#include 'src/builtins/builtins-promise-gen.h'
namespace promise {
// TODO(joshualitt): The below ContextSlots are only available on synthetic
// contexts created by the promise pipeline for use in the promise pipeline.
// However, with Torque we should type the context and its slots to prevent
// accidentially using these slots on contexts which don't support them.
const kPromiseBuiltinsValueSlot: constexpr ContextSlot
generates 'PromiseBuiltins::kValueSlot';
const kPromiseBuiltinsOnFinallySlot: constexpr ContextSlot
generates 'PromiseBuiltins::kOnFinallySlot';
const kPromiseBuiltinsConstructorSlot: constexpr ContextSlot
generates 'PromiseBuiltins::kConstructorSlot';
const kPromiseBuiltinsPromiseValueThunkOrReasonContextLength: constexpr int31
generates 'PromiseBuiltins::kPromiseValueThunkOrReasonContextLength';
const kPromiseBuiltinsPromiseFinallyContextLength: constexpr int31
generates 'PromiseBuiltins::kPromiseFinallyContextLength';
transitioning javascript builtin
PromiseValueThunkFinally(
js-implicit context: Context, receiver: JSAny)(): JSAny {
return UnsafeCast<JSAny>(context[kPromiseBuiltinsValueSlot]);
}
transitioning javascript builtin
PromiseThrowerFinally(js-implicit context: Context, receiver: JSAny)(): never {
const reason = UnsafeCast<JSAny>(context[kPromiseBuiltinsValueSlot]);
Throw(reason);
}
macro CreateThrowerFunction(implicit context: Context)(
nativeContext: NativeContext, reason: JSAny): JSFunction {
const throwerContext = AllocateSyntheticFunctionContext(
nativeContext, kPromiseBuiltinsPromiseValueThunkOrReasonContextLength);
throwerContext[kPromiseBuiltinsValueSlot] = reason;
const map = UnsafeCast<Map>(
nativeContext
[NativeContextSlot::STRICT_FUNCTION_WITHOUT_PROTOTYPE_MAP_INDEX]);
const throwerInfo = PromiseThrowerFinallySharedFunConstant();
return AllocateFunctionWithMapAndContext(map, throwerInfo, throwerContext);
}
transitioning javascript builtin
PromiseCatchFinally(
js-implicit context: Context, receiver: JSAny)(reason: JSAny): JSAny {
// 1. Let onFinally be F.[[OnFinally]].
// 2. Assert: IsCallable(onFinally) is true.
const onFinally =
UnsafeCast<Callable>(context[kPromiseBuiltinsOnFinallySlot]);
// 3. Let result be ? Call(onFinally).
const result = Call(context, onFinally, Undefined);
// 4. Let C be F.[[Constructor]].
const constructor =
UnsafeCast<JSFunction>(context[kPromiseBuiltinsConstructorSlot]);
// 5. Assert: IsConstructor(C) is true.
assert(IsConstructor(constructor));
// 6. Let promise be ? PromiseResolve(C, result).
const promise = PromiseResolve(constructor, result);
// 7. Let thrower be equivalent to a function that throws reason.
const nativeContext = LoadNativeContext(context);
const thrower = CreateThrowerFunction(nativeContext, reason);
// 8. Return ? Invoke(promise, "then", « thrower »).
return UnsafeCast<JSAny>(InvokeThen(nativeContext, promise, thrower));
}
macro CreateValueThunkFunction(implicit context: Context)(
nativeContext: NativeContext, value: JSAny): JSFunction {
const valueThunkContext = AllocateSyntheticFunctionContext(
nativeContext, kPromiseBuiltinsPromiseValueThunkOrReasonContextLength);
valueThunkContext[kPromiseBuiltinsValueSlot] = value;
const map = UnsafeCast<Map>(
nativeContext
[NativeContextSlot::STRICT_FUNCTION_WITHOUT_PROTOTYPE_MAP_INDEX]);
const valueThunkInfo = PromiseValueThunkFinallySharedFunConstant();
return AllocateFunctionWithMapAndContext(
map, valueThunkInfo, valueThunkContext);
}
transitioning javascript builtin
PromiseThenFinally(
js-implicit context: Context, receiver: JSAny)(value: JSAny): JSAny {
// 1. Let onFinally be F.[[OnFinally]].
// 2. Assert: IsCallable(onFinally) is true.
const onFinally =
UnsafeCast<Callable>(context[kPromiseBuiltinsOnFinallySlot]);
// 3. Let result be ? Call(onFinally).
const result = Call(context, onFinally, Undefined);
// 4. Let C be F.[[Constructor]].
const constructor =
UnsafeCast<JSFunction>(context[kPromiseBuiltinsConstructorSlot]);
// 5. Assert: IsConstructor(C) is true.
assert(IsConstructor(constructor));
// 6. Let promise be ? PromiseResolve(C, result).
const promise = PromiseResolve(constructor, result);
// 7. Let valueThunk be equivalent to a function that returns value.
const nativeContext = LoadNativeContext(context);
const valueThunk = CreateValueThunkFunction(nativeContext, value);
// 8. Return ? Invoke(promise, "then", « valueThunk »).
return UnsafeCast<JSAny>(InvokeThen(nativeContext, promise, valueThunk));
}
struct PromiseFinallyFunctions {
then_finally: JSFunction;
catch_finally: JSFunction;
}
macro CreatePromiseFinallyFunctions(implicit context: Context)(
nativeContext: NativeContext, onFinally: Callable,
constructor: JSReceiver): PromiseFinallyFunctions {
const promiseContext = AllocateSyntheticFunctionContext(
nativeContext, kPromiseBuiltinsPromiseFinallyContextLength);
promiseContext[kPromiseBuiltinsOnFinallySlot] = onFinally;
promiseContext[kPromiseBuiltinsConstructorSlot] = constructor;
const map = UnsafeCast<Map>(
nativeContext
[NativeContextSlot::STRICT_FUNCTION_WITHOUT_PROTOTYPE_MAP_INDEX]);
const thenFinallyInfo = PromiseThenFinallySharedFunConstant();
const thenFinally =
AllocateFunctionWithMapAndContext(map, thenFinallyInfo, promiseContext);
const catchFinallyInfo = PromiseCatchFinallySharedFunConstant();
const catchFinally =
AllocateFunctionWithMapAndContext(map, catchFinallyInfo, promiseContext);
return PromiseFinallyFunctions{
then_finally: thenFinally,
catch_finally: catchFinally
};
}
transitioning javascript builtin
PromisePrototypeFinally(
js-implicit context: Context, receiver: JSAny)(onFinally: JSAny): JSAny {
// 1. Let promise be the this value.
// 2. If Type(promise) is not Object, throw a TypeError exception.
const jsReceiver = Cast<JSReceiver>(receiver) otherwise ThrowTypeError(
MessageTemplate::kCalledOnNonObject, 'Promise.prototype.finally');
// 3. Let C be ? SpeciesConstructor(promise, %Promise%).
const nativeContext = LoadNativeContext(context);
const promiseFun = UnsafeCast<Callable>(
nativeContext[NativeContextSlot::PROMISE_FUNCTION_INDEX]);
let constructor: JSReceiver = promiseFun;
const receiverMap = jsReceiver.map;
if (!IsJSPromiseMap(receiverMap) ||
!IsPromiseSpeciesLookupChainIntact(nativeContext, receiverMap))
deferred {
constructor = SpeciesConstructor(jsReceiver, promiseFun);
}
// 4. Assert: IsConstructor(C) is true.
assert(IsConstructor(constructor));
// 5. If IsCallable(onFinally) is not true,
// a. Let thenFinally be onFinally.
// b. Let catchFinally be onFinally.
// 6. Else,
// a. Let thenFinally be a new built-in function object as defined
// in ThenFinally Function.
// b. Let catchFinally be a new built-in function object as
// defined in CatchFinally Function.
// c. Set thenFinally and catchFinally's [[Constructor]] internal
// slots to C.
// d. Set thenFinally and catchFinally's [[OnFinally]] internal
// slots to onFinally.
let thenFinally: JSAny;
let catchFinally: JSAny;
typeswitch (onFinally) {
case (onFinally: Callable): {
const pair =
CreatePromiseFinallyFunctions(nativeContext, onFinally, constructor);
thenFinally = pair.then_finally;
catchFinally = pair.catch_finally;
}
case (JSAny): deferred {
thenFinally = onFinally;
catchFinally = onFinally;
}
}
// 7. Return ? Invoke(promise, "then", « thenFinally, catchFinally »).
return UnsafeCast<JSAny>(
InvokeThen(nativeContext, receiver, thenFinally, catchFinally));
}
extern macro PromiseCatchFinallySharedFunConstant(): SharedFunctionInfo;
extern macro PromiseThenFinallySharedFunConstant(): SharedFunctionInfo;
extern macro PromiseThrowerFinallySharedFunConstant(): SharedFunctionInfo;
extern macro PromiseValueThunkFinallySharedFunConstant(): SharedFunctionInfo;
}
|