Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 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/compiler/js-frame-specialization.h" |
| 6 | |
| 7 | #include "src/compiler/js-graph.h" |
| 8 | #include "src/compiler/linkage.h" |
| 9 | #include "src/frames-inl.h" |
| 10 | |
| 11 | namespace v8 { |
| 12 | namespace internal { |
| 13 | namespace compiler { |
| 14 | |
| 15 | Reduction JSFrameSpecialization::Reduce(Node* node) { |
| 16 | switch (node->opcode()) { |
| 17 | case IrOpcode::kOsrValue: |
| 18 | return ReduceOsrValue(node); |
| 19 | case IrOpcode::kParameter: |
| 20 | return ReduceParameter(node); |
| 21 | default: |
| 22 | break; |
| 23 | } |
| 24 | return NoChange(); |
| 25 | } |
| 26 | |
| 27 | |
| 28 | Reduction JSFrameSpecialization::ReduceOsrValue(Node* node) { |
| 29 | DCHECK_EQ(IrOpcode::kOsrValue, node->opcode()); |
| 30 | Handle<Object> value; |
| 31 | int const index = OpParameter<int>(node); |
| 32 | int const parameters_count = frame()->ComputeParametersCount() + 1; |
| 33 | if (index == Linkage::kOsrContextSpillSlotIndex) { |
| 34 | value = handle(frame()->context(), isolate()); |
| 35 | } else if (index >= parameters_count) { |
| 36 | value = handle(frame()->GetExpression(index - parameters_count), isolate()); |
| 37 | } else { |
| 38 | // The OsrValue index 0 is the receiver. |
| 39 | value = |
| 40 | handle(index ? frame()->GetParameter(index - 1) : frame()->receiver(), |
| 41 | isolate()); |
| 42 | } |
| 43 | return Replace(jsgraph()->Constant(value)); |
| 44 | } |
| 45 | |
| 46 | |
| 47 | Reduction JSFrameSpecialization::ReduceParameter(Node* node) { |
| 48 | DCHECK_EQ(IrOpcode::kParameter, node->opcode()); |
| 49 | Handle<Object> value; |
| 50 | int const index = ParameterIndexOf(node->op()); |
| 51 | int const parameters_count = frame()->ComputeParametersCount() + 1; |
| 52 | if (index == Linkage::kJSCallClosureParamIndex) { |
| 53 | // The Parameter index references the closure. |
| 54 | value = handle(frame()->function(), isolate()); |
| 55 | } else if (index == Linkage::GetJSCallArgCountParamIndex(parameters_count)) { |
| 56 | // The Parameter index references the parameter count. |
| 57 | value = handle(Smi::FromInt(parameters_count - 1), isolate()); |
| 58 | } else if (index == Linkage::GetJSCallContextParamIndex(parameters_count)) { |
| 59 | // The Parameter index references the context. |
| 60 | value = handle(frame()->context(), isolate()); |
| 61 | } else { |
| 62 | // The Parameter index 0 is the receiver. |
| 63 | value = |
| 64 | handle(index ? frame()->GetParameter(index - 1) : frame()->receiver(), |
| 65 | isolate()); |
| 66 | } |
| 67 | return Replace(jsgraph()->Constant(value)); |
| 68 | } |
| 69 | |
| 70 | |
| 71 | Isolate* JSFrameSpecialization::isolate() const { return jsgraph()->isolate(); } |
| 72 | |
| 73 | } // namespace compiler |
| 74 | } // namespace internal |
| 75 | } // namespace v8 |