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comparison: js/src/jit/BaselineDebugModeOSR.h
js/src/jit/BaselineDebugModeOSR.h
- branch
- TOR_BUG_3246
- changeset 7
- 129ffea94266
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| -1:000000000000 | 0:3692c0f60e74 |
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| 1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- | |
| 2 * vim: set ts=8 sts=4 et sw=4 tw=99: | |
| 3 * This Source Code Form is subject to the terms of the Mozilla Public | |
| 4 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 6 | |
| 7 #ifndef jit_BaselineDebugModeOSR_h | |
| 8 #define jit_BaselineDebugModeOSR_h | |
| 9 | |
| 10 #ifdef JS_ION | |
| 11 | |
| 12 #include "jit/BaselineFrame.h" | |
| 13 #include "jit/BaselineIC.h" | |
| 14 #include "jit/BaselineJIT.h" | |
| 15 | |
| 16 namespace js { | |
| 17 namespace jit { | |
| 18 | |
| 19 // Note that this file and the corresponding .cpp implement debug mode | |
| 20 // on-stack recompilation. This is to be distinguished from ordinary | |
| 21 // Baseline->Ion OSR, which is used to jump into compiled loops. | |
| 22 | |
| 23 // | |
| 24 // A volatile location due to recompilation of an on-stack baseline script | |
| 25 // (e.g., for debug mode toggling). | |
| 26 // | |
| 27 // It is usually used in fallback stubs which may trigger on-stack | |
| 28 // recompilation by calling out into the VM. Example use: | |
| 29 // | |
| 30 // DebugModeOSRVolatileStub<FallbackStubT *> stub(frame, stub_) | |
| 31 // | |
| 32 // // Call out to the VM | |
| 33 // // Other effectful operations like TypeScript::Monitor | |
| 34 // | |
| 35 // if (stub.invalid()) | |
| 36 // return true; | |
| 37 // | |
| 38 // // First use of stub after VM call. | |
| 39 // | |
| 40 template <typename T> | |
| 41 class DebugModeOSRVolatileStub | |
| 42 { | |
| 43 T stub_; | |
| 44 BaselineFrame *frame_; | |
| 45 uint32_t pcOffset_; | |
| 46 | |
| 47 public: | |
| 48 DebugModeOSRVolatileStub(BaselineFrame *frame, ICFallbackStub *stub) | |
| 49 : stub_(static_cast<T>(stub)), | |
| 50 frame_(frame), | |
| 51 pcOffset_(stub->icEntry()->pcOffset()) | |
| 52 { } | |
| 53 | |
| 54 bool invalid() const { | |
| 55 ICEntry &entry = frame_->script()->baselineScript()->icEntryFromPCOffset(pcOffset_); | |
| 56 return stub_ != entry.fallbackStub(); | |
| 57 } | |
| 58 | |
| 59 operator const T&() const { MOZ_ASSERT(!invalid()); return stub_; } | |
| 60 T operator->() const { MOZ_ASSERT(!invalid()); return stub_; } | |
| 61 T *address() { MOZ_ASSERT(!invalid()); return &stub_; } | |
| 62 const T *address() const { MOZ_ASSERT(!invalid()); return &stub_; } | |
| 63 T &get() { MOZ_ASSERT(!invalid()); return stub_; } | |
| 64 const T &get() const { MOZ_ASSERT(!invalid()); return stub_; } | |
| 65 | |
| 66 bool operator!=(const T &other) const { MOZ_ASSERT(!invalid()); return stub_ != other; } | |
| 67 bool operator==(const T &other) const { MOZ_ASSERT(!invalid()); return stub_ == other; } | |
| 68 }; | |
| 69 | |
| 70 // | |
| 71 // Auxiliary info to help the DebugModeOSRHandler fix up state. | |
| 72 // | |
| 73 struct BaselineDebugModeOSRInfo | |
| 74 { | |
| 75 uint8_t *resumeAddr; | |
| 76 jsbytecode *pc; | |
| 77 PCMappingSlotInfo slotInfo; | |
| 78 ICEntry::Kind frameKind; | |
| 79 | |
| 80 // Filled in by SyncBaselineDebugModeOSRInfo. | |
| 81 uintptr_t stackAdjust; | |
| 82 Value valueR0; | |
| 83 Value valueR1; | |
| 84 | |
| 85 BaselineDebugModeOSRInfo(jsbytecode *pc, ICEntry::Kind kind) | |
| 86 : resumeAddr(nullptr), | |
| 87 pc(pc), | |
| 88 slotInfo(0), | |
| 89 frameKind(kind), | |
| 90 stackAdjust(0), | |
| 91 valueR0(UndefinedValue()), | |
| 92 valueR1(UndefinedValue()) | |
| 93 { } | |
| 94 | |
| 95 void popValueInto(PCMappingSlotInfo::SlotLocation loc, Value *vp); | |
| 96 }; | |
| 97 | |
| 98 bool | |
| 99 RecompileOnStackBaselineScriptsForDebugMode(JSContext *cx, JSCompartment *comp); | |
| 100 | |
| 101 } // namespace jit | |
| 102 } // namespace js | |
| 103 | |
| 104 #endif // JS_ION | |
| 105 | |
| 106 #endif // jit_BaselineDebugModeOSR_h |
