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1 // Copyright 2012 the V8 project authors. All rights reserved. | 1 // Copyright 2012 the V8 project authors. All rights reserved. |
2 // Redistribution and use in source and binary forms, with or without | 2 // Redistribution and use in source and binary forms, with or without |
3 // modification, are permitted provided that the following conditions are | 3 // modification, are permitted provided that the following conditions are |
4 // met: | 4 // met: |
5 // | 5 // |
6 // * Redistributions of source code must retain the above copyright | 6 // * Redistributions of source code must retain the above copyright |
7 // notice, this list of conditions and the following disclaimer. | 7 // notice, this list of conditions and the following disclaimer. |
8 // * Redistributions in binary form must reproduce the above | 8 // * Redistributions in binary form must reproduce the above |
9 // copyright notice, this list of conditions and the following | 9 // copyright notice, this list of conditions and the following |
10 // disclaimer in the documentation and/or other materials provided | 10 // disclaimer in the documentation and/or other materials provided |
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962 ReadOnlySetAccessor, | 962 ReadOnlySetAccessor, |
963 0 | 963 0 |
964 }; | 964 }; |
965 | 965 |
966 | 966 |
967 // | 967 // |
968 // Accessors::FunctionArguments | 968 // Accessors::FunctionArguments |
969 // | 969 // |
970 | 970 |
971 | 971 |
972 Handle<Object> Accessors::FunctionGetArguments(Handle<JSFunction> function) { | 972 static Handle<Object> ArgumentsForInlinedFunction( |
973 CALL_HEAP_FUNCTION(function->GetIsolate(), | |
974 Accessors::FunctionGetArguments(function->GetIsolate(), | |
975 *function, | |
976 NULL), | |
977 Object); | |
978 } | |
979 | |
980 | |
981 static Object* ConstructArgumentsObjectForInlinedFunction( | |
982 JavaScriptFrame* frame, | 973 JavaScriptFrame* frame, |
983 Handle<JSFunction> inlined_function, | 974 Handle<JSFunction> inlined_function, |
984 int inlined_frame_index) { | 975 int inlined_frame_index) { |
985 Isolate* isolate = inlined_function->GetIsolate(); | 976 Isolate* isolate = inlined_function->GetIsolate(); |
986 Factory* factory = isolate->factory(); | 977 Factory* factory = isolate->factory(); |
987 SlotRefValueBuilder slot_refs( | 978 SlotRefValueBuilder slot_refs( |
988 frame, | 979 frame, |
989 inlined_frame_index, | 980 inlined_frame_index, |
990 inlined_function->shared()->formal_parameter_count()); | 981 inlined_function->shared()->formal_parameter_count()); |
991 | 982 |
992 int args_count = slot_refs.args_length(); | 983 int args_count = slot_refs.args_length(); |
993 Handle<JSObject> arguments = | 984 Handle<JSObject> arguments = |
994 factory->NewArgumentsObject(inlined_function, args_count); | 985 factory->NewArgumentsObject(inlined_function, args_count); |
995 Handle<FixedArray> array = factory->NewFixedArray(args_count); | 986 Handle<FixedArray> array = factory->NewFixedArray(args_count); |
996 slot_refs.Prepare(isolate); | 987 slot_refs.Prepare(isolate); |
997 for (int i = 0; i < args_count; ++i) { | 988 for (int i = 0; i < args_count; ++i) { |
998 Handle<Object> value = slot_refs.GetNext(isolate, 0); | 989 Handle<Object> value = slot_refs.GetNext(isolate, 0); |
999 array->set(i, *value); | 990 array->set(i, *value); |
1000 } | 991 } |
1001 slot_refs.Finish(isolate); | 992 slot_refs.Finish(isolate); |
1002 arguments->set_elements(*array); | 993 arguments->set_elements(*array); |
1003 | 994 |
1004 // Return the freshly allocated arguments object. | 995 // Return the freshly allocated arguments object. |
1005 return *arguments; | 996 return arguments; |
| 997 } |
| 998 |
| 999 |
| 1000 static int FindFunctionInFrame(JavaScriptFrame* frame, |
| 1001 Handle<JSFunction> function) { |
| 1002 DisallowHeapAllocation no_allocation; |
| 1003 List<JSFunction*> functions(2); |
| 1004 frame->GetFunctions(&functions); |
| 1005 for (int i = functions.length() - 1; i >= 0; i--) { |
| 1006 if (functions[i] == *function) return i; |
| 1007 } |
| 1008 return -1; |
| 1009 } |
| 1010 |
| 1011 |
| 1012 Handle<Object> GetFunctionArguments(Isolate* isolate, |
| 1013 Handle<JSFunction> function) { |
| 1014 if (function->shared()->native()) return isolate->factory()->null_value(); |
| 1015 |
| 1016 // Find the top invocation of the function by traversing frames. |
| 1017 for (JavaScriptFrameIterator it(isolate); !it.done(); it.Advance()) { |
| 1018 JavaScriptFrame* frame = it.frame(); |
| 1019 int function_index = FindFunctionInFrame(frame, function); |
| 1020 if (function_index < 0) continue; |
| 1021 |
| 1022 if (function_index > 0) { |
| 1023 // The function in question was inlined. Inlined functions have the |
| 1024 // correct number of arguments and no allocated arguments object, so |
| 1025 // we can construct a fresh one by interpreting the function's |
| 1026 // deoptimization input data. |
| 1027 return ArgumentsForInlinedFunction(frame, function, function_index); |
| 1028 } |
| 1029 |
| 1030 if (!frame->is_optimized()) { |
| 1031 // If there is an arguments variable in the stack, we return that. |
| 1032 Handle<ScopeInfo> scope_info(function->shared()->scope_info()); |
| 1033 int index = scope_info->StackSlotIndex( |
| 1034 isolate->heap()->arguments_string()); |
| 1035 if (index >= 0) { |
| 1036 Handle<Object> arguments(frame->GetExpression(index), isolate); |
| 1037 if (!arguments->IsArgumentsMarker()) return arguments; |
| 1038 } |
| 1039 } |
| 1040 |
| 1041 // If there is no arguments variable in the stack or we have an |
| 1042 // optimized frame, we find the frame that holds the actual arguments |
| 1043 // passed to the function. |
| 1044 it.AdvanceToArgumentsFrame(); |
| 1045 frame = it.frame(); |
| 1046 |
| 1047 // Get the number of arguments and construct an arguments object |
| 1048 // mirror for the right frame. |
| 1049 const int length = frame->ComputeParametersCount(); |
| 1050 Handle<JSObject> arguments = isolate->factory()->NewArgumentsObject( |
| 1051 function, length); |
| 1052 Handle<FixedArray> array = isolate->factory()->NewFixedArray(length); |
| 1053 |
| 1054 // Copy the parameters to the arguments object. |
| 1055 ASSERT(array->length() == length); |
| 1056 for (int i = 0; i < length; i++) array->set(i, frame->GetParameter(i)); |
| 1057 arguments->set_elements(*array); |
| 1058 |
| 1059 // Return the freshly allocated arguments object. |
| 1060 return arguments; |
| 1061 } |
| 1062 |
| 1063 // No frame corresponding to the given function found. Return null. |
| 1064 return isolate->factory()->null_value(); |
| 1065 } |
| 1066 |
| 1067 |
| 1068 Handle<Object> Accessors::FunctionGetArguments(Handle<JSFunction> function) { |
| 1069 return GetFunctionArguments(function->GetIsolate(), function); |
1006 } | 1070 } |
1007 | 1071 |
1008 | 1072 |
1009 Object* Accessors::FunctionGetArguments(Isolate* isolate, | 1073 Object* Accessors::FunctionGetArguments(Isolate* isolate, |
1010 Object* object, | 1074 Object* object, |
1011 void*) { | 1075 void*) { |
1012 HandleScope scope(isolate); | 1076 HandleScope scope(isolate); |
1013 JSFunction* holder = FindInstanceOf<JSFunction>(isolate, object); | 1077 Handle<JSFunction> function; |
1014 if (holder == NULL) return isolate->heap()->undefined_value(); | 1078 { |
1015 Handle<JSFunction> function(holder, isolate); | 1079 DisallowHeapAllocation no_allocation; |
1016 | 1080 JSFunction* holder = FindInstanceOf<JSFunction>(isolate, object); |
1017 if (function->shared()->native()) return isolate->heap()->null_value(); | 1081 if (holder == NULL) return isolate->heap()->undefined_value(); |
1018 // Find the top invocation of the function by traversing frames. | 1082 function = Handle<JSFunction>(holder, isolate); |
1019 List<JSFunction*> functions(2); | |
1020 for (JavaScriptFrameIterator it(isolate); !it.done(); it.Advance()) { | |
1021 JavaScriptFrame* frame = it.frame(); | |
1022 frame->GetFunctions(&functions); | |
1023 for (int i = functions.length() - 1; i >= 0; i--) { | |
1024 // Skip all frames that aren't invocations of the given function. | |
1025 if (functions[i] != *function) continue; | |
1026 | |
1027 if (i > 0) { | |
1028 // The function in question was inlined. Inlined functions have the | |
1029 // correct number of arguments and no allocated arguments object, so | |
1030 // we can construct a fresh one by interpreting the function's | |
1031 // deoptimization input data. | |
1032 return ConstructArgumentsObjectForInlinedFunction(frame, function, i); | |
1033 } | |
1034 | |
1035 if (!frame->is_optimized()) { | |
1036 // If there is an arguments variable in the stack, we return that. | |
1037 Handle<ScopeInfo> scope_info(function->shared()->scope_info()); | |
1038 int index = scope_info->StackSlotIndex( | |
1039 isolate->heap()->arguments_string()); | |
1040 if (index >= 0) { | |
1041 Handle<Object> arguments(frame->GetExpression(index), isolate); | |
1042 if (!arguments->IsArgumentsMarker()) return *arguments; | |
1043 } | |
1044 } | |
1045 | |
1046 // If there is no arguments variable in the stack or we have an | |
1047 // optimized frame, we find the frame that holds the actual arguments | |
1048 // passed to the function. | |
1049 it.AdvanceToArgumentsFrame(); | |
1050 frame = it.frame(); | |
1051 | |
1052 // Get the number of arguments and construct an arguments object | |
1053 // mirror for the right frame. | |
1054 const int length = frame->ComputeParametersCount(); | |
1055 Handle<JSObject> arguments = isolate->factory()->NewArgumentsObject( | |
1056 function, length); | |
1057 Handle<FixedArray> array = isolate->factory()->NewFixedArray(length); | |
1058 | |
1059 // Copy the parameters to the arguments object. | |
1060 ASSERT(array->length() == length); | |
1061 for (int i = 0; i < length; i++) array->set(i, frame->GetParameter(i)); | |
1062 arguments->set_elements(*array); | |
1063 | |
1064 // Return the freshly allocated arguments object. | |
1065 return *arguments; | |
1066 } | |
1067 functions.Rewind(0); | |
1068 } | 1083 } |
1069 | 1084 return *GetFunctionArguments(isolate, function); |
1070 // No frame corresponding to the given function found. Return null. | |
1071 return isolate->heap()->null_value(); | |
1072 } | 1085 } |
1073 | 1086 |
1074 | 1087 |
1075 const AccessorDescriptor Accessors::FunctionArguments = { | 1088 const AccessorDescriptor Accessors::FunctionArguments = { |
1076 FunctionGetArguments, | 1089 FunctionGetArguments, |
1077 ReadOnlySetAccessor, | 1090 ReadOnlySetAccessor, |
1078 0 | 1091 0 |
1079 }; | 1092 }; |
1080 | 1093 |
1081 | 1094 |
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1248 info->set_data(Smi::FromInt(index)); | 1261 info->set_data(Smi::FromInt(index)); |
1249 Handle<Object> getter = v8::FromCData(isolate, &ModuleGetExport); | 1262 Handle<Object> getter = v8::FromCData(isolate, &ModuleGetExport); |
1250 Handle<Object> setter = v8::FromCData(isolate, &ModuleSetExport); | 1263 Handle<Object> setter = v8::FromCData(isolate, &ModuleSetExport); |
1251 info->set_getter(*getter); | 1264 info->set_getter(*getter); |
1252 if (!(attributes & ReadOnly)) info->set_setter(*setter); | 1265 if (!(attributes & ReadOnly)) info->set_setter(*setter); |
1253 return info; | 1266 return info; |
1254 } | 1267 } |
1255 | 1268 |
1256 | 1269 |
1257 } } // namespace v8::internal | 1270 } } // namespace v8::internal |
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