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 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 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 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 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
