1 // Copyright 2015 the V8 project authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #include "src/runtime/runtime-utils.h"
6
7 #include "src/arguments.h"
8 #include "src/objects-inl.h"
9
10 namespace v8 {
11 namespace internal {
12
RUNTIME_FUNCTION(Runtime_ForInDone)13 RUNTIME_FUNCTION(Runtime_ForInDone) {
14 SealHandleScope scope(isolate);
15 DCHECK_EQ(2, args.length());
16 CONVERT_SMI_ARG_CHECKED(index, 0);
17 CONVERT_SMI_ARG_CHECKED(length, 1);
18 DCHECK_LE(0, index);
19 DCHECK_LE(index, length);
20 return isolate->heap()->ToBoolean(index == length);
21 }
22
23
RUNTIME_FUNCTION(Runtime_ForInFilter)24 RUNTIME_FUNCTION(Runtime_ForInFilter) {
25 HandleScope scope(isolate);
26 DCHECK_EQ(2, args.length());
27 CONVERT_ARG_HANDLE_CHECKED(JSReceiver, receiver, 0);
28 CONVERT_ARG_HANDLE_CHECKED(Object, key, 1);
29 // TODO(turbofan): Fast case for array indices.
30 Handle<Name> name;
31 if (!Object::ToName(isolate, key).ToHandle(&name)) {
32 return isolate->heap()->exception();
33 }
34 Maybe<bool> result = JSReceiver::HasProperty(receiver, name);
35 if (!result.IsJust()) return isolate->heap()->exception();
36 if (result.FromJust()) return *name;
37 return isolate->heap()->undefined_value();
38 }
39
40
RUNTIME_FUNCTION(Runtime_ForInNext)41 RUNTIME_FUNCTION(Runtime_ForInNext) {
42 HandleScope scope(isolate);
43 DCHECK_EQ(4, args.length());
44 CONVERT_ARG_HANDLE_CHECKED(JSReceiver, receiver, 0);
45 CONVERT_ARG_HANDLE_CHECKED(FixedArray, cache_array, 1);
46 CONVERT_ARG_HANDLE_CHECKED(Object, cache_type, 2);
47 CONVERT_SMI_ARG_CHECKED(index, 3);
48 Handle<Object> key = handle(cache_array->get(index), isolate);
49 // Don't need filtering if expected map still matches that of the receiver,
50 // and neither for proxies.
51 if (receiver->map() == *cache_type || *cache_type == Smi::FromInt(0)) {
52 return *key;
53 }
54 // TODO(turbofan): Fast case for array indices.
55 Handle<Name> name;
56 if (!Object::ToName(isolate, key).ToHandle(&name)) {
57 return isolate->heap()->exception();
58 }
59 Maybe<bool> result = JSReceiver::HasProperty(receiver, name);
60 if (!result.IsJust()) return isolate->heap()->exception();
61 if (result.FromJust()) return *name;
62 return isolate->heap()->undefined_value();
63 }
64
65
RUNTIME_FUNCTION(Runtime_ForInStep)66 RUNTIME_FUNCTION(Runtime_ForInStep) {
67 SealHandleScope scope(isolate);
68 DCHECK_EQ(1, args.length());
69 CONVERT_SMI_ARG_CHECKED(index, 0);
70 DCHECK_LE(0, index);
71 DCHECK_LT(index, Smi::kMaxValue);
72 return Smi::FromInt(index + 1);
73 }
74
75 } // namespace internal
76 } // namespace v8
77