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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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34 | 34 |
35 // ------------------------------------------------------------------------- | 35 // ------------------------------------------------------------------------- |
36 // Virtual frames | 36 // Virtual frames |
37 // | 37 // |
38 // The virtual frame is an abstraction of the physical stack frame. It | 38 // The virtual frame is an abstraction of the physical stack frame. It |
39 // encapsulates the parameters, frame-allocated locals, and the expression | 39 // encapsulates the parameters, frame-allocated locals, and the expression |
40 // stack. It supports push/pop operations on the expression stack, as well | 40 // stack. It supports push/pop operations on the expression stack, as well |
41 // as random access to the expression stack elements, locals, and | 41 // as random access to the expression stack elements, locals, and |
42 // parameters. | 42 // parameters. |
43 | 43 |
44 class VirtualFrame : public Malloced { | 44 class VirtualFrame : public ZoneObject { |
45 public: | 45 public: |
46 // A utility class to introduce a scope where the virtual frame is | 46 // A utility class to introduce a scope where the virtual frame is |
47 // expected to remain spilled. The constructor spills the code | 47 // expected to remain spilled. The constructor spills the code |
48 // generator's current frame, but no attempt is made to require it | 48 // generator's current frame, but no attempt is made to require it |
49 // to stay spilled. It is intended as documentation while the code | 49 // to stay spilled. It is intended as documentation while the code |
50 // generator is being transformed. | 50 // generator is being transformed. |
51 class SpilledScope BASE_EMBEDDED { | 51 class SpilledScope BASE_EMBEDDED { |
52 public: | 52 public: |
53 explicit SpilledScope(CodeGenerator* cgen); | 53 explicit SpilledScope(CodeGenerator* cgen); |
54 | 54 |
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328 static const int kLocal0Offset = JavaScriptFrameConstants::kLocal0Offset; | 328 static const int kLocal0Offset = JavaScriptFrameConstants::kLocal0Offset; |
329 static const int kFunctionOffset = JavaScriptFrameConstants::kFunctionOffset; | 329 static const int kFunctionOffset = JavaScriptFrameConstants::kFunctionOffset; |
330 static const int kContextOffset = StandardFrameConstants::kContextOffset; | 330 static const int kContextOffset = StandardFrameConstants::kContextOffset; |
331 | 331 |
332 static const int kHandlerSize = StackHandlerConstants::kSize / kPointerSize; | 332 static const int kHandlerSize = StackHandlerConstants::kSize / kPointerSize; |
333 static const int kPreallocatedElements = 5 + 8; // 8 expression stack slots. | 333 static const int kPreallocatedElements = 5 + 8; // 8 expression stack slots. |
334 | 334 |
335 CodeGenerator* cgen_; | 335 CodeGenerator* cgen_; |
336 MacroAssembler* masm_; | 336 MacroAssembler* masm_; |
337 | 337 |
338 List<FrameElement> elements_; | 338 ZoneList<FrameElement> elements_; |
339 | 339 |
340 // The number of frame-allocated locals and parameters respectively. | 340 // The number of frame-allocated locals and parameters respectively. |
341 int parameter_count_; | 341 int16_t parameter_count_; |
342 int local_count_; | 342 int16_t local_count_; |
343 | 343 |
344 // The index of the element that is at the processor's stack pointer | 344 // The index of the element that is at the processor's stack pointer |
345 // (the sp register). | 345 // (the sp register). |
346 int stack_pointer_; | 346 int16_t stack_pointer_; |
347 | 347 |
348 // The index of the element that is at the processor's frame pointer | 348 // The index of the element that is at the processor's frame pointer |
349 // (the fp register). | 349 // (the fp register). |
350 int frame_pointer_; | 350 int16_t frame_pointer_; |
351 | 351 |
352 // The index of the register frame element using each register, or | 352 // The index of the register frame element using each register, or |
353 // kIllegalIndex if a register is not on the frame. | 353 // kIllegalIndex if a register is not on the frame. |
354 int register_locations_[kNumRegisters]; | 354 int16_t register_locations_[kNumRegisters]; |
355 | 355 |
356 // The index of the first parameter. The receiver lies below the first | 356 // The index of the first parameter. The receiver lies below the first |
357 // parameter. | 357 // parameter. |
358 int param0_index() const { return 1; } | 358 int param0_index() const { return 1; } |
359 | 359 |
360 // The index of the context slot in the frame. | 360 // The index of the context slot in the frame. |
361 int context_index() const { | 361 int context_index() const { |
362 ASSERT(frame_pointer_ != kIllegalIndex); | 362 ASSERT(frame_pointer_ != kIllegalIndex); |
363 return frame_pointer_ - 1; | 363 return frame_pointer_ - 1; |
364 } | 364 } |
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483 } | 483 } |
484 } | 484 } |
485 | 485 |
486 friend class JumpTarget; | 486 friend class JumpTarget; |
487 }; | 487 }; |
488 | 488 |
489 | 489 |
490 } } // namespace v8::internal | 490 } } // namespace v8::internal |
491 | 491 |
492 #endif // V8_ARM_VIRTUAL_FRAME_ARM_H_ | 492 #endif // V8_ARM_VIRTUAL_FRAME_ARM_H_ |
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