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1 // Copyright 2008 the V8 project authors. All rights reserved. | 1 // Copyright 2008 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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28 #ifndef V8_JUMP_TARGET_H_ | 28 #ifndef V8_JUMP_TARGET_H_ |
29 #define V8_JUMP_TARGET_H_ | 29 #define V8_JUMP_TARGET_H_ |
30 | 30 |
31 namespace v8 { namespace internal { | 31 namespace v8 { namespace internal { |
32 | 32 |
33 // Forward declarations. | 33 // Forward declarations. |
34 class FrameElement; | 34 class FrameElement; |
35 class Result; | 35 class Result; |
36 class VirtualFrame; | 36 class VirtualFrame; |
37 | 37 |
| 38 |
38 // ------------------------------------------------------------------------- | 39 // ------------------------------------------------------------------------- |
39 // Jump targets | 40 // Jump targets |
40 // | 41 // |
41 // A jump target is an abstraction of a basic-block entry in generated | 42 // A jump target is an abstraction of a basic-block entry in generated |
42 // code. It collects all the virtual frames reaching the block by | 43 // code. It collects all the virtual frames reaching the block by |
43 // forward jumps and pairs them with labels for the merge code along | 44 // forward jumps and pairs them with labels for the merge code along |
44 // all forward-reaching paths. When bound, an expected frame for the | 45 // all forward-reaching paths. When bound, an expected frame for the |
45 // block is determined and code is generated to merge to the expected | 46 // block is determined and code is generated to merge to the expected |
46 // frame. For backward jumps, the merge code is generated at the edge | 47 // frame. For backward jumps, the merge code is generated at the edge |
47 // leaving the predecessor block. | 48 // leaving the predecessor block. |
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191 void DoBranch(Condition cc, Hint hint); | 192 void DoBranch(Condition cc, Hint hint); |
192 void DoBind(int mergable_elements); | 193 void DoBind(int mergable_elements); |
193 | 194 |
194 private: | 195 private: |
195 static bool compiling_deferred_code_; | 196 static bool compiling_deferred_code_; |
196 | 197 |
197 // Add a virtual frame reaching this labeled block via a forward jump, | 198 // Add a virtual frame reaching this labeled block via a forward jump, |
198 // and a corresponding merge code label. | 199 // and a corresponding merge code label. |
199 void AddReachingFrame(VirtualFrame* frame); | 200 void AddReachingFrame(VirtualFrame* frame); |
200 | 201 |
201 // Perform initialization required during entry frame computation | 202 // Compute a frame to use for entry to this block. Mergable elements |
202 // after setting the virtual frame element at index in frame to be | 203 // is as described for the Bind function. |
203 // target. | |
204 inline void InitializeEntryElement(int index, FrameElement* target); | |
205 | |
206 // Compute a frame to use for entry to this block. Mergable | |
207 // elements is as described for the Bind function. | |
208 void ComputeEntryFrame(int mergable_elements); | 204 void ComputeEntryFrame(int mergable_elements); |
209 | 205 |
210 DISALLOW_COPY_AND_ASSIGN(JumpTarget); | 206 DISALLOW_COPY_AND_ASSIGN(JumpTarget); |
211 }; | 207 }; |
212 | 208 |
213 | 209 |
214 // ------------------------------------------------------------------------- | 210 // ------------------------------------------------------------------------- |
215 // Break targets | 211 // Break targets |
216 // | 212 // |
217 // A break target is a jump target that can be used to break out of a | 213 // A break target is a jump target that can be used to break out of a |
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309 bool is_shadowing_; | 305 bool is_shadowing_; |
310 #endif | 306 #endif |
311 | 307 |
312 DISALLOW_COPY_AND_ASSIGN(ShadowTarget); | 308 DISALLOW_COPY_AND_ASSIGN(ShadowTarget); |
313 }; | 309 }; |
314 | 310 |
315 | 311 |
316 } } // namespace v8::internal | 312 } } // namespace v8::internal |
317 | 313 |
318 #endif // V8_JUMP_TARGET_H_ | 314 #endif // V8_JUMP_TARGET_H_ |
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