1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/js/src/jit/BaselineDebugModeOSR.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,106 @@
1.4 +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
1.5 + * vim: set ts=8 sts=4 et sw=4 tw=99:
1.6 + * This Source Code Form is subject to the terms of the Mozilla Public
1.7 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.8 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.9 +
1.10 +#ifndef jit_BaselineDebugModeOSR_h
1.11 +#define jit_BaselineDebugModeOSR_h
1.12 +
1.13 +#ifdef JS_ION
1.14 +
1.15 +#include "jit/BaselineFrame.h"
1.16 +#include "jit/BaselineIC.h"
1.17 +#include "jit/BaselineJIT.h"
1.18 +
1.19 +namespace js {
1.20 +namespace jit {
1.21 +
1.22 +// Note that this file and the corresponding .cpp implement debug mode
1.23 +// on-stack recompilation. This is to be distinguished from ordinary
1.24 +// Baseline->Ion OSR, which is used to jump into compiled loops.
1.25 +
1.26 +//
1.27 +// A volatile location due to recompilation of an on-stack baseline script
1.28 +// (e.g., for debug mode toggling).
1.29 +//
1.30 +// It is usually used in fallback stubs which may trigger on-stack
1.31 +// recompilation by calling out into the VM. Example use:
1.32 +//
1.33 +// DebugModeOSRVolatileStub<FallbackStubT *> stub(frame, stub_)
1.34 +//
1.35 +// // Call out to the VM
1.36 +// // Other effectful operations like TypeScript::Monitor
1.37 +//
1.38 +// if (stub.invalid())
1.39 +// return true;
1.40 +//
1.41 +// // First use of stub after VM call.
1.42 +//
1.43 +template <typename T>
1.44 +class DebugModeOSRVolatileStub
1.45 +{
1.46 + T stub_;
1.47 + BaselineFrame *frame_;
1.48 + uint32_t pcOffset_;
1.49 +
1.50 + public:
1.51 + DebugModeOSRVolatileStub(BaselineFrame *frame, ICFallbackStub *stub)
1.52 + : stub_(static_cast<T>(stub)),
1.53 + frame_(frame),
1.54 + pcOffset_(stub->icEntry()->pcOffset())
1.55 + { }
1.56 +
1.57 + bool invalid() const {
1.58 + ICEntry &entry = frame_->script()->baselineScript()->icEntryFromPCOffset(pcOffset_);
1.59 + return stub_ != entry.fallbackStub();
1.60 + }
1.61 +
1.62 + operator const T&() const { MOZ_ASSERT(!invalid()); return stub_; }
1.63 + T operator->() const { MOZ_ASSERT(!invalid()); return stub_; }
1.64 + T *address() { MOZ_ASSERT(!invalid()); return &stub_; }
1.65 + const T *address() const { MOZ_ASSERT(!invalid()); return &stub_; }
1.66 + T &get() { MOZ_ASSERT(!invalid()); return stub_; }
1.67 + const T &get() const { MOZ_ASSERT(!invalid()); return stub_; }
1.68 +
1.69 + bool operator!=(const T &other) const { MOZ_ASSERT(!invalid()); return stub_ != other; }
1.70 + bool operator==(const T &other) const { MOZ_ASSERT(!invalid()); return stub_ == other; }
1.71 +};
1.72 +
1.73 +//
1.74 +// Auxiliary info to help the DebugModeOSRHandler fix up state.
1.75 +//
1.76 +struct BaselineDebugModeOSRInfo
1.77 +{
1.78 + uint8_t *resumeAddr;
1.79 + jsbytecode *pc;
1.80 + PCMappingSlotInfo slotInfo;
1.81 + ICEntry::Kind frameKind;
1.82 +
1.83 + // Filled in by SyncBaselineDebugModeOSRInfo.
1.84 + uintptr_t stackAdjust;
1.85 + Value valueR0;
1.86 + Value valueR1;
1.87 +
1.88 + BaselineDebugModeOSRInfo(jsbytecode *pc, ICEntry::Kind kind)
1.89 + : resumeAddr(nullptr),
1.90 + pc(pc),
1.91 + slotInfo(0),
1.92 + frameKind(kind),
1.93 + stackAdjust(0),
1.94 + valueR0(UndefinedValue()),
1.95 + valueR1(UndefinedValue())
1.96 + { }
1.97 +
1.98 + void popValueInto(PCMappingSlotInfo::SlotLocation loc, Value *vp);
1.99 +};
1.100 +
1.101 +bool
1.102 +RecompileOnStackBaselineScriptsForDebugMode(JSContext *cx, JSCompartment *comp);
1.103 +
1.104 +} // namespace jit
1.105 +} // namespace js
1.106 +
1.107 +#endif // JS_ION
1.108 +
1.109 +#endif // jit_BaselineDebugModeOSR_h
