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1 // Copyright 2009 the V8 project authors. All rights reserved. | 1 // Copyright 2009 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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105 // frame (eg, the frame after an exception handler is pushed). No code is | 105 // frame (eg, the frame after an exception handler is pushed). No code is |
106 // emitted. | 106 // emitted. |
107 void Adjust(int count); | 107 void Adjust(int count); |
108 | 108 |
109 // Forget elements from the top of the frame to match an actual frame (eg, | 109 // Forget elements from the top of the frame to match an actual frame (eg, |
110 // the frame after a runtime call). No code is emitted. | 110 // the frame after a runtime call). No code is emitted. |
111 void Forget(int count) { | 111 void Forget(int count) { |
112 ASSERT(count >= 0); | 112 ASSERT(count >= 0); |
113 ASSERT(stack_pointer_ == element_count() - 1); | 113 ASSERT(stack_pointer_ == element_count() - 1); |
114 stack_pointer_ -= count; | 114 stack_pointer_ -= count; |
115 ForgetElements(count); | 115 // On ARM, all elements are in memory, so there is no extra bookkeeping |
| 116 // (registers, copies, etc.) beyond dropping the elements. |
| 117 elements_.Rewind(stack_pointer_ + 1); |
116 } | 118 } |
117 | 119 |
118 // Forget count elements from the top of the frame without adjusting | 120 // Forget count elements from the top of the frame and adjust the stack |
119 // the stack pointer downward. This is used, for example, before | 121 // pointer downward. This is used, for example, before merging frames at |
120 // merging frames at break, continue, and return targets. | 122 // break, continue, and return targets. |
121 void ForgetElements(int count); | 123 void ForgetElements(int count); |
122 | 124 |
123 // Spill all values from the frame to memory. | 125 // Spill all values from the frame to memory. |
124 void SpillAll(); | 126 void SpillAll(); |
125 | 127 |
126 // Spill all occurrences of a specific register from the frame. | 128 // Spill all occurrences of a specific register from the frame. |
127 void Spill(Register reg) { | 129 void Spill(Register reg) { |
128 if (is_used(reg)) SpillElementAt(register_location(reg)); | 130 if (is_used(reg)) SpillElementAt(register_location(reg)); |
129 } | 131 } |
130 | 132 |
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514 | 516 |
515 // Classes that need raw access to the elements_ array. | 517 // Classes that need raw access to the elements_ array. |
516 friend class DeferredCode; | 518 friend class DeferredCode; |
517 friend class JumpTarget; | 519 friend class JumpTarget; |
518 }; | 520 }; |
519 | 521 |
520 | 522 |
521 } } // namespace v8::internal | 523 } } // namespace v8::internal |
522 | 524 |
523 #endif // V8_ARM_VIRTUAL_FRAME_ARM_H_ | 525 #endif // V8_ARM_VIRTUAL_FRAME_ARM_H_ |
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