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
|
// Copyright 2014 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/execution/arguments-inl.h"
#include "src/heap/factory.h"
#include "src/heap/heap-inl.h"
#include "src/logging/counters.h"
#include "src/objects/js-generator-inl.h"
#include "src/objects/objects-inl.h"
#include "src/runtime/runtime-utils.h"
namespace v8 {
namespace internal {
RUNTIME_FUNCTION(Runtime_AsyncFunctionAwaitCaught) {
// Runtime call is implemented in InterpreterIntrinsics and lowered in
// JSIntrinsicLowering
UNREACHABLE();
}
RUNTIME_FUNCTION(Runtime_AsyncFunctionAwaitUncaught) {
// Runtime call is implemented in InterpreterIntrinsics and lowered in
// JSIntrinsicLowering
UNREACHABLE();
}
RUNTIME_FUNCTION(Runtime_AsyncFunctionEnter) {
// Runtime call is implemented in InterpreterIntrinsics and lowered in
// JSIntrinsicLowering
UNREACHABLE();
}
RUNTIME_FUNCTION(Runtime_AsyncFunctionReject) {
// Runtime call is implemented in InterpreterIntrinsics and lowered in
// JSIntrinsicLowering
UNREACHABLE();
}
RUNTIME_FUNCTION(Runtime_AsyncFunctionResolve) {
// Runtime call is implemented in InterpreterIntrinsics and lowered in
// JSIntrinsicLowering
UNREACHABLE();
}
RUNTIME_FUNCTION(Runtime_CreateJSGeneratorObject) {
HandleScope scope(isolate);
DCHECK_EQ(2, args.length());
CONVERT_ARG_HANDLE_CHECKED(JSFunction, function, 0);
CONVERT_ARG_HANDLE_CHECKED(Object, receiver, 1);
CHECK_IMPLIES(IsAsyncFunction(function->shared().kind()),
IsAsyncGeneratorFunction(function->shared().kind()));
CHECK(IsResumableFunction(function->shared().kind()));
// Underlying function needs to have bytecode available.
DCHECK(function->shared().HasBytecodeArray());
int size = function->shared().internal_formal_parameter_count() +
function->shared().GetBytecodeArray().register_count();
Handle<FixedArray> parameters_and_registers =
isolate->factory()->NewFixedArray(size);
Handle<JSGeneratorObject> generator =
isolate->factory()->NewJSGeneratorObject(function);
generator->set_function(*function);
generator->set_context(isolate->context());
generator->set_receiver(*receiver);
generator->set_parameters_and_registers(*parameters_and_registers);
generator->set_resume_mode(JSGeneratorObject::ResumeMode::kNext);
generator->set_continuation(JSGeneratorObject::kGeneratorExecuting);
if (generator->IsJSAsyncGeneratorObject()) {
Handle<JSAsyncGeneratorObject>::cast(generator)->set_is_awaiting(0);
}
return *generator;
}
RUNTIME_FUNCTION(Runtime_GeneratorClose) {
// Runtime call is implemented in InterpreterIntrinsics and lowered in
// JSIntrinsicLowering
UNREACHABLE();
}
RUNTIME_FUNCTION(Runtime_GeneratorGetFunction) {
HandleScope scope(isolate);
DCHECK_EQ(1, args.length());
CONVERT_ARG_HANDLE_CHECKED(JSGeneratorObject, generator, 0);
return generator->function();
}
RUNTIME_FUNCTION(Runtime_AsyncGeneratorAwaitCaught) {
// Runtime call is implemented in InterpreterIntrinsics and lowered in
// JSIntrinsicLowering
UNREACHABLE();
}
RUNTIME_FUNCTION(Runtime_AsyncGeneratorAwaitUncaught) {
// Runtime call is implemented in InterpreterIntrinsics and lowered in
// JSIntrinsicLowering
UNREACHABLE();
}
RUNTIME_FUNCTION(Runtime_AsyncGeneratorResolve) {
// Runtime call is implemented in InterpreterIntrinsics and lowered in
// JSIntrinsicLowering
UNREACHABLE();
}
RUNTIME_FUNCTION(Runtime_AsyncGeneratorReject) {
// Runtime call is implemented in InterpreterIntrinsics and lowered in
// JSIntrinsicLowering
UNREACHABLE();
}
RUNTIME_FUNCTION(Runtime_AsyncGeneratorYield) {
// Runtime call is implemented in InterpreterIntrinsics and lowered in
// JSIntrinsicLowering
UNREACHABLE();
}
RUNTIME_FUNCTION(Runtime_GeneratorGetResumeMode) {
// Runtime call is implemented in InterpreterIntrinsics and lowered in
// JSIntrinsicLowering
UNREACHABLE();
}
// Return true if {generator}'s PC has a catch handler. This allows
// catch prediction to happen from the AsyncGeneratorResumeNext stub.
RUNTIME_FUNCTION(Runtime_AsyncGeneratorHasCatchHandlerForPC) {
DisallowHeapAllocation no_allocation_scope;
DCHECK_EQ(1, args.length());
CONVERT_ARG_CHECKED(JSAsyncGeneratorObject, generator, 0);
int state = generator.continuation();
DCHECK_NE(state, JSAsyncGeneratorObject::kGeneratorExecuting);
// If state is 0 ("suspendedStart"), there is guaranteed to be no catch
// handler. Otherwise, if state is below 0, the generator is closed and will
// not reach a catch handler.
if (state < 1) return ReadOnlyRoots(isolate).false_value();
SharedFunctionInfo shared = generator.function().shared();
DCHECK(shared.HasBytecodeArray());
HandlerTable handler_table(shared.GetBytecodeArray());
int pc = Smi::cast(generator.input_or_debug_pos()).value();
HandlerTable::CatchPrediction catch_prediction = HandlerTable::ASYNC_AWAIT;
handler_table.LookupRange(pc, nullptr, &catch_prediction);
return isolate->heap()->ToBoolean(catch_prediction == HandlerTable::CAUGHT);
}
} // namespace internal
} // namespace v8
|
