projects / apple / javascriptcore.git / blame
| Commit | Line | Data |
|---|---|---|
| f9bf01c6 | 1 | /* |
| ed1e77d3 | 2 | * Copyright (C) 2014 Apple Inc. All rights reserved. |
| f9bf01c6 A |
3 | * |
| 4 | * Redistribution and use in source and binary forms, with or without | |
| 5 | * modification, are permitted provided that the following conditions | |
| 6 | * are met: | |
| 7 | * 1. Redistributions of source code must retain the above copyright | |
| 8 | * notice, this list of conditions and the following disclaimer. | |
| 9 | * 2. Redistributions in binary form must reproduce the above copyright | |
| 10 | * notice, this list of conditions and the following disclaimer in the | |
| 11 | * documentation and/or other materials provided with the distribution. | |
| 12 | * | |
| 13 | * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY | |
| 14 | * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
| 15 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR | |
| 16 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR | |
| 17 | * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, | |
| 18 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, | |
| 19 | * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR | |
| 20 | * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY | |
| 21 | * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
| 22 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
| 23 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 24 | */ | |
| 25 | ||
| ed1e77d3 A |
26 | #ifndef DFGStructureRegistrationPhase_h |
| 27 | #define DFGStructureRegistrationPhase_h | |
| f9bf01c6 | 28 | |
| 6fe7ccc8 | 29 | #if ENABLE(DFG_JIT) |
| f9bf01c6 | 30 | |
| 6fe7ccc8 | 31 | namespace JSC { namespace DFG { |
| f9bf01c6 | 32 | |
| 6fe7ccc8 | 33 | class Graph; |
| 14957cd0 | 34 | |
| ed1e77d3 A |
35 | // Registers any structures we know about as weak references, and sets watchpoints on any |
| 36 | // such structures that we know of that are currently watchable. It's somewhat | |
| 37 | // counterintuitive, but this ends up being the cleanest and most effective way of reducing | |
| 38 | // structure checks on terminal structures: | |
| 93a37866 | 39 | // |
| ed1e77d3 A |
40 | // - We used to only set watchpoints on watchable structures if we knew that this would |
| 41 | // remove a structure check. Experiments show that switching from that, to blindly | |
| 42 | // setting watchpoints on all watchable structures, was not a regression. | |
| 43 | // | |
| 44 | // - It makes abstract interpretation a whole lot easier. We just assume that watchable | |
| 45 | // structures are unclobberable without having to do any other logic. | |
| 14957cd0 | 46 | |
| ed1e77d3 | 47 | bool performStructureRegistration(Graph&); |
| f9bf01c6 | 48 | |
| 6fe7ccc8 | 49 | } } // namespace JSC::DFG |
| f9bf01c6 | 50 | |
| 6fe7ccc8 A |
51 | #endif // ENABLE(DFG_JIT) |
| 52 | ||
| ed1e77d3 | 53 | #endif // DFGStructureRegistrationPhase_h |
| 14957cd0 | 54 |