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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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| 1960 } | 1960 } |
| 1961 | 1961 |
| 1962 | 1962 |
| 1963 void FullCodeGenerator::VisitYield(Yield* expr) { | 1963 void FullCodeGenerator::VisitYield(Yield* expr) { |
| 1964 Comment cmnt(masm_, "[ Yield"); | 1964 Comment cmnt(masm_, "[ Yield"); |
| 1965 // Evaluate yielded value first; the initial iterator definition depends on | 1965 // Evaluate yielded value first; the initial iterator definition depends on |
| 1966 // this. It stays on the stack while we update the iterator. | 1966 // this. It stays on the stack while we update the iterator. |
| 1967 VisitForStackValue(expr->expression()); | 1967 VisitForStackValue(expr->expression()); |
| 1968 | 1968 |
| 1969 switch (expr->yield_kind()) { | 1969 switch (expr->yield_kind()) { |
| 1970 case Yield::kSuspend: | 1970 case Yield::SUSPEND: |
| 1971 // Pop value from top-of-stack slot; box result into result register. | 1971 // Pop value from top-of-stack slot; box result into result register. |
| 1972 EmitCreateIteratorResult(false); | 1972 EmitCreateIteratorResult(false); |
| 1973 __ push(result_register()); | 1973 __ push(result_register()); |
| 1974 // Fall through. | 1974 // Fall through. |
| 1975 case Yield::kInitial: { | 1975 case Yield::INITIAL: { |
| 1976 Label suspend, continuation, post_runtime, resume; | 1976 Label suspend, continuation, post_runtime, resume; |
| 1977 | 1977 |
| 1978 __ jmp(&suspend); | 1978 __ jmp(&suspend); |
| 1979 | 1979 |
| 1980 __ bind(&continuation); | 1980 __ bind(&continuation); |
| 1981 __ jmp(&resume); | 1981 __ jmp(&resume); |
| 1982 | 1982 |
| 1983 __ bind(&suspend); | 1983 __ bind(&suspend); |
| 1984 VisitForAccumulatorValue(expr->generator_object()); | 1984 VisitForAccumulatorValue(expr->generator_object()); |
| 1985 ASSERT(continuation.pos() > 0 && Smi::IsValid(continuation.pos())); | 1985 ASSERT(continuation.pos() > 0 && Smi::IsValid(continuation.pos())); |
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| 1999 __ bind(&post_runtime); | 1999 __ bind(&post_runtime); |
| 2000 | 2000 |
| 2001 __ pop(result_register()); | 2001 __ pop(result_register()); |
| 2002 EmitReturnSequence(); | 2002 EmitReturnSequence(); |
| 2003 | 2003 |
| 2004 __ bind(&resume); | 2004 __ bind(&resume); |
| 2005 context()->Plug(result_register()); | 2005 context()->Plug(result_register()); |
| 2006 break; | 2006 break; |
| 2007 } | 2007 } |
| 2008 | 2008 |
| 2009 case Yield::kFinal: { | 2009 case Yield::FINAL: { |
| 2010 VisitForAccumulatorValue(expr->generator_object()); | 2010 VisitForAccumulatorValue(expr->generator_object()); |
| 2011 __ Move(FieldOperand(result_register(), | 2011 __ Move(FieldOperand(result_register(), |
| 2012 JSGeneratorObject::kContinuationOffset), | 2012 JSGeneratorObject::kContinuationOffset), |
| 2013 Smi::FromInt(JSGeneratorObject::kGeneratorClosed)); | 2013 Smi::FromInt(JSGeneratorObject::kGeneratorClosed)); |
| 2014 // Pop value from top-of-stack slot, box result into result register. | 2014 // Pop value from top-of-stack slot, box result into result register. |
| 2015 EmitCreateIteratorResult(true); | 2015 EmitCreateIteratorResult(true); |
| 2016 EmitUnwindBeforeReturn(); | 2016 EmitUnwindBeforeReturn(); |
| 2017 EmitReturnSequence(); | 2017 EmitReturnSequence(); |
| 2018 break; | 2018 break; |
| 2019 } | 2019 } |
| 2020 | 2020 |
| 2021 case Yield::kDelegating: { | 2021 case Yield::DELEGATING: { |
| 2022 VisitForStackValue(expr->generator_object()); | 2022 VisitForStackValue(expr->generator_object()); |
| 2023 | 2023 |
| 2024 // Initial stack layout is as follows: | 2024 // Initial stack layout is as follows: |
| 2025 // [sp + 1 * kPointerSize] iter | 2025 // [sp + 1 * kPointerSize] iter |
| 2026 // [sp + 0 * kPointerSize] g | 2026 // [sp + 0 * kPointerSize] g |
| 2027 | 2027 |
| 2028 Label l_catch, l_try, l_suspend, l_continuation, l_resume; | 2028 Label l_catch, l_try, l_suspend, l_continuation, l_resume; |
| 2029 Label l_next, l_call, l_loop; | 2029 Label l_next, l_call, l_loop; |
| 2030 // Initial send value is undefined. | 2030 // Initial send value is undefined. |
| 2031 __ LoadRoot(rax, Heap::kUndefinedValueRootIndex); | 2031 __ LoadRoot(rax, Heap::kUndefinedValueRootIndex); |
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| 4882 *context_length = 0; | 4882 *context_length = 0; |
| 4883 return previous_; | 4883 return previous_; |
| 4884 } | 4884 } |
| 4885 | 4885 |
| 4886 | 4886 |
| 4887 #undef __ | 4887 #undef __ |
| 4888 | 4888 |
| 4889 } } // namespace v8::internal | 4889 } } // namespace v8::internal |
| 4890 | 4890 |
| 4891 #endif // V8_TARGET_ARCH_X64 | 4891 #endif // V8_TARGET_ARCH_X64 |
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