The Tor Browser: js/src/vm/Stack.cpp@129ffea94266 (annotated)

js/src/vm/Stack.cpp@129ffea94266 (annotated)

js/src/vm/Stack.cpp

Sat, 03 Jan 2015 20:18:00 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Sat, 03 Jan 2015 20:18:00 +0100
branch: TOR_BUG_3246
changeset 7: 129ffea94266
permissions: -rw-r--r--

Conditionally enable double key logic according to:
private browsing mode or privacy.thirdparty.isolate preference and
implement in GetCookieStringCommon and FindCookie where it counts...
With some reservations of how to convince FindCookie users to test
condition and pass a nullptr when disabling double key logic.

 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
  * vim: set ts=8 sts=4 et sw=4 tw=99:
  * This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 #include "vm/Stack-inl.h"
 #include "mozilla/PodOperations.h"
 #include "jscntxt.h"
 #include "gc/Marking.h"
 #ifdef JS_ION
 #include "jit/AsmJSModule.h"
 #include "jit/BaselineFrame.h"
 #include "jit/JitCompartment.h"
 #endif
 #include "js/GCAPI.h"
 #include "vm/Opcodes.h"
 #include "jit/JitFrameIterator-inl.h"
 #include "vm/Interpreter-inl.h"
 #include "vm/Probes-inl.h"
 #include "vm/ScopeObject-inl.h"
 using namespace js;
 using mozilla::PodCopy;
 /*****************************************************************************/
 void
 InterpreterFrame::initExecuteFrame(JSContext *cx, JSScript *script, AbstractFramePtr evalInFramePrev,
                                    const Value &thisv, JSObject &scopeChain, ExecuteType type)
 {
     /*
      * See encoding of ExecuteType. When GLOBAL isn't set, we are executing a
      * script in the context of another frame and the frame type is determined
      * by the context.
      */
     flags_ = type | HAS_SCOPECHAIN;
     JSObject *callee = nullptr;
     if (!(flags_ & (GLOBAL))) {
         if (evalInFramePrev) {
             JS_ASSERT(evalInFramePrev.isFunctionFrame() || evalInFramePrev.isGlobalFrame());
             if (evalInFramePrev.isFunctionFrame()) {
                 callee = evalInFramePrev.callee();
                 flags_ |= FUNCTION;
             } else {
                 flags_ |= GLOBAL;
             }
         } else {
             FrameIter iter(cx);
             JS_ASSERT(iter.isFunctionFrame() || iter.isGlobalFrame());
             JS_ASSERT(!iter.isAsmJS());
             if (iter.isFunctionFrame()) {
                 callee = iter.callee();
                 flags_ |= FUNCTION;
             } else {
                 flags_ |= GLOBAL;
             }
         }
     }
     Value *dstvp = (Value *)this - 2;
     dstvp[1] = thisv;
     if (isFunctionFrame()) {
         dstvp[0] = ObjectValue(*callee);
         exec.fun = &callee->as<JSFunction>();
         u.evalScript = script;
     } else {
         JS_ASSERT(isGlobalFrame());
         dstvp[0] = NullValue();
         exec.script = script;
 #ifdef DEBUG
         u.evalScript = (JSScript *)0xbad;
 #endif
     }
     scopeChain_ = &scopeChain;
     prev_ = nullptr;
     prevpc_ = nullptr;
     prevsp_ = nullptr;
     JS_ASSERT_IF(evalInFramePrev, isDebuggerFrame());
     evalInFramePrev_ = evalInFramePrev;
 #ifdef DEBUG
     Debug_SetValueRangeToCrashOnTouch(&rval_, 1);
     hookData_ = (void *)0xbad;
 #endif
 }
 template <InterpreterFrame::TriggerPostBarriers doPostBarrier>
 void
 InterpreterFrame::copyFrameAndValues(JSContext *cx, Value *vp, InterpreterFrame *otherfp,
                                      const Value *othervp, Value *othersp)
 {
     JS_ASSERT(othervp == otherfp->generatorArgsSnapshotBegin());
     JS_ASSERT(othersp >= otherfp->slots());
     JS_ASSERT(othersp <= otherfp->generatorSlotsSnapshotBegin() + otherfp->script()->nslots());
     /* Copy args, InterpreterFrame, and slots. */
     const Value *srcend = otherfp->generatorArgsSnapshotEnd();
     Value *dst = vp;
     for (const Value *src = othervp; src < srcend; src++, dst++) {
         *dst = *src;
         if (doPostBarrier)
             HeapValue::writeBarrierPost(*dst, dst);
     }
     *this = *otherfp;
     argv_ = vp + 2;
     unsetPushedSPSFrame();
     if (doPostBarrier)
         writeBarrierPost();
     srcend = othersp;
     dst = slots();
     for (const Value *src = otherfp->slots(); src < srcend; src++, dst++) {
         *dst = *src;
         if (doPostBarrier)
             HeapValue::writeBarrierPost(*dst, dst);
     }
 }
 /* Note: explicit instantiation for js_NewGenerator located in jsiter.cpp. */
 template
 void InterpreterFrame::copyFrameAndValues<InterpreterFrame::NoPostBarrier>(
                                     JSContext *, Value *, InterpreterFrame *, const Value *, Value *);
 template
 void InterpreterFrame::copyFrameAndValues<InterpreterFrame::DoPostBarrier>(
                                     JSContext *, Value *, InterpreterFrame *, const Value *, Value *);
 void
 InterpreterFrame::writeBarrierPost()
 {
     /* This needs to follow the same rules as in InterpreterFrame::mark. */
     if (scopeChain_)
         JSObject::writeBarrierPost(scopeChain_, (void *)&scopeChain_);
     if (flags_ & HAS_ARGS_OBJ)
         JSObject::writeBarrierPost(argsObj_, (void *)&argsObj_);
     if (isFunctionFrame()) {
         JSFunction::writeBarrierPost(exec.fun, (void *)&exec.fun);
         if (isEvalFrame())
             JSScript::writeBarrierPost(u.evalScript, (void *)&u.evalScript);
     } else {
         JSScript::writeBarrierPost(exec.script, (void *)&exec.script);
     }
     if (hasReturnValue())
         HeapValue::writeBarrierPost(rval_, &rval_);
 }
 bool
 InterpreterFrame::copyRawFrameSlots(AutoValueVector *vec)
 {
     if (!vec->resize(numFormalArgs() + script()->nfixed()))
         return false;
     PodCopy(vec->begin(), argv(), numFormalArgs());
     PodCopy(vec->begin() + numFormalArgs(), slots(), script()->nfixed());
     return true;
 }
 JSObject *
 InterpreterFrame::createRestParameter(JSContext *cx)
 {
     JS_ASSERT(fun()->hasRest());
     unsigned nformal = fun()->nargs() - 1, nactual = numActualArgs();
     unsigned nrest = (nactual > nformal) ? nactual - nformal : 0;
     Value *restvp = argv() + nformal;
     JSObject *obj = NewDenseCopiedArray(cx, nrest, restvp, nullptr);
     if (!obj)
         return nullptr;
     types::FixRestArgumentsType(cx, obj);
     return obj;
 }
 static inline void
 AssertDynamicScopeMatchesStaticScope(JSContext *cx, JSScript *script, JSObject *scope)
 {
 #ifdef DEBUG
     RootedObject enclosingScope(cx, script->enclosingStaticScope());
     for (StaticScopeIter<NoGC> i(enclosingScope); !i.done(); i++) {
         if (i.hasDynamicScopeObject()) {
             switch (i.type()) {
               case StaticScopeIter<NoGC>::BLOCK:
                 JS_ASSERT(&i.block() == scope->as<ClonedBlockObject>().staticScope());
                 scope = &scope->as<ClonedBlockObject>().enclosingScope();
                 break;
               case StaticScopeIter<NoGC>::WITH:
                 JS_ASSERT(&i.staticWith() == scope->as<DynamicWithObject>().staticScope());
                 scope = &scope->as<DynamicWithObject>().enclosingScope();
                 break;
               case StaticScopeIter<NoGC>::FUNCTION:
                 JS_ASSERT(scope->as<CallObject>().callee().nonLazyScript() == i.funScript());
                 scope = &scope->as<CallObject>().enclosingScope();
                 break;
               case StaticScopeIter<NoGC>::NAMED_LAMBDA:
                 scope = &scope->as<DeclEnvObject>().enclosingScope();
                 break;
             }
         }
     }
     /*
      * Ideally, we'd JS_ASSERT(!scope->is<ScopeObject>()) but the enclosing
      * lexical scope chain stops at eval() boundaries. See StaticScopeIter
      * comment.
      */
 #endif
 }
 bool
 InterpreterFrame::initFunctionScopeObjects(JSContext *cx)
 {
     CallObject *callobj = CallObject::createForFunction(cx, this);
     if (!callobj)
         return false;
     pushOnScopeChain(*callobj);
     flags_ |= HAS_CALL_OBJ;
     return true;
 }
 bool
 InterpreterFrame::prologue(JSContext *cx)
 {
     RootedScript script(cx, this->script());
     JS_ASSERT(!isGeneratorFrame());
     JS_ASSERT(cx->interpreterRegs().pc == script->code());
     if (isEvalFrame()) {
         if (script->strict()) {
             CallObject *callobj = CallObject::createForStrictEval(cx, this);
             if (!callobj)
                 return false;
             pushOnScopeChain(*callobj);
             flags_ |= HAS_CALL_OBJ;
         }
         return probes::EnterScript(cx, script, nullptr, this);
     }
     if (isGlobalFrame())
         return probes::EnterScript(cx, script, nullptr, this);
     JS_ASSERT(isNonEvalFunctionFrame());
     AssertDynamicScopeMatchesStaticScope(cx, script, scopeChain());
     if (fun()->isHeavyweight() && !initFunctionScopeObjects(cx))
         return false;
     if (isConstructing()) {
         RootedObject callee(cx, &this->callee());
         JSObject *obj = CreateThisForFunction(cx, callee,
                                               useNewType() ? SingletonObject : GenericObject);
         if (!obj)
             return false;
         functionThis() = ObjectValue(*obj);
     }
     return probes::EnterScript(cx, script, script->functionNonDelazifying(), this);
 }
 void
 InterpreterFrame::epilogue(JSContext *cx)
 {
     JS_ASSERT(!isYielding());
     RootedScript script(cx, this->script());
     probes::ExitScript(cx, script, script->functionNonDelazifying(), hasPushedSPSFrame());
     if (isEvalFrame()) {
         if (isStrictEvalFrame()) {
             JS_ASSERT_IF(hasCallObj(), scopeChain()->as<CallObject>().isForEval());
             if (MOZ_UNLIKELY(cx->compartment()->debugMode()))
                 DebugScopes::onPopStrictEvalScope(this);
         } else if (isDirectEvalFrame()) {
             if (isDebuggerFrame())
                 JS_ASSERT(!scopeChain()->is<ScopeObject>());
         } else {
             /*
              * Debugger.Object.prototype.evalInGlobal creates indirect eval
              * frames scoped to the given global;
              * Debugger.Object.prototype.evalInGlobalWithBindings creates
              * indirect eval frames scoped to an object carrying the introduced
              * bindings.
              */
             if (isDebuggerFrame()) {
                 JS_ASSERT(scopeChain()->is<GlobalObject>() ||
                           scopeChain()->enclosingScope()->is<GlobalObject>());
             } else {
                 JS_ASSERT(scopeChain()->is<GlobalObject>());
             }
         }
         return;
     }
     if (isGlobalFrame()) {
         JS_ASSERT(!scopeChain()->is<ScopeObject>());
         return;
     }
     JS_ASSERT(isNonEvalFunctionFrame());
     if (fun()->isHeavyweight())
         JS_ASSERT_IF(hasCallObj(),
                      scopeChain()->as<CallObject>().callee().nonLazyScript() == script);
     else
         AssertDynamicScopeMatchesStaticScope(cx, script, scopeChain());
     if (MOZ_UNLIKELY(cx->compartment()->debugMode()))
         DebugScopes::onPopCall(this, cx);
     if (isConstructing() && thisValue().isObject() && returnValue().isPrimitive())
         setReturnValue(ObjectValue(constructorThis()));
 }
 bool
 InterpreterFrame::pushBlock(JSContext *cx, StaticBlockObject &block)
 {
     JS_ASSERT (block.needsClone());
     Rooted<StaticBlockObject *> blockHandle(cx, &block);
     ClonedBlockObject *clone = ClonedBlockObject::create(cx, blockHandle, this);
     if (!clone)
         return false;
     pushOnScopeChain(*clone);
     return true;
 }
 void
 InterpreterFrame::popBlock(JSContext *cx)
 {
     JS_ASSERT(scopeChain_->is<ClonedBlockObject>());
     popOffScopeChain();
 }
 void
 InterpreterFrame::popWith(JSContext *cx)
 {
     if (MOZ_UNLIKELY(cx->compartment()->debugMode()))
         DebugScopes::onPopWith(this);
     JS_ASSERT(scopeChain()->is<DynamicWithObject>());
     popOffScopeChain();
 }
 void
 InterpreterFrame::mark(JSTracer *trc)
 {
     /*
      * Normally we would use MarkRoot here, except that generators also take
      * this path. However, generators use a special write barrier when the stack
      * frame is copied to the floating frame. Therefore, no barrier is needed.
      */
     if (flags_ & HAS_SCOPECHAIN)
         gc::MarkObjectUnbarriered(trc, &scopeChain_, "scope chain");
     if (flags_ & HAS_ARGS_OBJ)
         gc::MarkObjectUnbarriered(trc, &argsObj_, "arguments");
     if (isFunctionFrame()) {
         gc::MarkObjectUnbarriered(trc, &exec.fun, "fun");
         if (isEvalFrame())
             gc::MarkScriptUnbarriered(trc, &u.evalScript, "eval script");
     } else {
         gc::MarkScriptUnbarriered(trc, &exec.script, "script");
     }
     if (IS_GC_MARKING_TRACER(trc))
         script()->compartment()->zone()->active = true;
     gc::MarkValueUnbarriered(trc, returnValue().address(), "rval");
 }
 void
 InterpreterFrame::markValues(JSTracer *trc, unsigned start, unsigned end)
 {
     if (start < end)
         gc::MarkValueRootRange(trc, end - start, slots() + start, "vm_stack");
 }
 void
 InterpreterFrame::markValues(JSTracer *trc, Value *sp, jsbytecode *pc)
 {
     JS_ASSERT(sp >= slots());
     NestedScopeObject *staticScope;
     staticScope = script()->getStaticScope(pc);
     while (staticScope && !staticScope->is<StaticBlockObject>())
         staticScope = staticScope->enclosingNestedScope();
     size_t nfixed = script()->nfixed();
     size_t nlivefixed;
     if (staticScope) {
         StaticBlockObject &blockObj = staticScope->as<StaticBlockObject>();
         nlivefixed = blockObj.localOffset() + blockObj.numVariables();
     } else {
         nlivefixed = script()->nfixedvars();
     }
     if (nfixed == nlivefixed) {
         // All locals are live.
         markValues(trc, 0, sp - slots());
     } else {
         // Mark operand stack.
         markValues(trc, nfixed, sp - slots());
         // Clear dead locals.
         while (nfixed > nlivefixed)
             unaliasedLocal(--nfixed, DONT_CHECK_ALIASING).setUndefined();
         // Mark live locals.
         markValues(trc, 0, nlivefixed);
     }
     if (hasArgs()) {
         // Mark callee, |this| and arguments.
         unsigned argc = Max(numActualArgs(), numFormalArgs());
         gc::MarkValueRootRange(trc, argc + 2, argv_ - 2, "fp argv");
     } else {
         // Mark callee and |this|
         gc::MarkValueRootRange(trc, 2, ((Value *)this) - 2, "stack callee and this");
     }
 }
 static void
 MarkInterpreterActivation(JSTracer *trc, InterpreterActivation *act)
 {
     for (InterpreterFrameIterator frames(act); !frames.done(); ++frames) {
         InterpreterFrame *fp = frames.frame();
         fp->markValues(trc, frames.sp(), frames.pc());
         fp->mark(trc);
     }
 }
 void
 js::MarkInterpreterActivations(JSRuntime *rt, JSTracer *trc)
 {
     for (ActivationIterator iter(rt); !iter.done(); ++iter) {
         Activation *act = iter.activation();
         if (act->isInterpreter())
             MarkInterpreterActivation(trc, act->asInterpreter());
     }
 }
 /*****************************************************************************/
 // Unlike the other methods of this calss, this method is defined here so that
 // we don't have to #include jsautooplen.h in vm/Stack.h.
 void
 InterpreterRegs::setToEndOfScript()
 {
     JSScript *script = fp()->script();
     sp = fp()->base();
     pc = script->codeEnd() - JSOP_RETRVAL_LENGTH;
     JS_ASSERT(*pc == JSOP_RETRVAL);
 }
 /*****************************************************************************/
 InterpreterFrame *
 InterpreterStack::pushInvokeFrame(JSContext *cx, const CallArgs &args, InitialFrameFlags initial)
 {
     LifoAlloc::Mark mark = allocator_.mark();
     RootedFunction fun(cx, &args.callee().as<JSFunction>());
     RootedScript script(cx, fun->nonLazyScript());
     InterpreterFrame::Flags flags = ToFrameFlags(initial);
     Value *argv;
     InterpreterFrame *fp = getCallFrame(cx, args, script, &flags, &argv);
     if (!fp)
         return nullptr;
     fp->mark_ = mark;
     fp->initCallFrame(cx, nullptr, nullptr, nullptr, *fun, script, argv, args.length(), flags);
     return fp;
 }
 InterpreterFrame *
 InterpreterStack::pushExecuteFrame(JSContext *cx, HandleScript script, const Value &thisv,
                                    HandleObject scopeChain, ExecuteType type,
                                    AbstractFramePtr evalInFrame)
 {
     LifoAlloc::Mark mark = allocator_.mark();
     unsigned nvars = 2 /* callee, this */ + script->nslots();
     uint8_t *buffer = allocateFrame(cx, sizeof(InterpreterFrame) + nvars * sizeof(Value));
     if (!buffer)
         return nullptr;
     InterpreterFrame *fp = reinterpret_cast<InterpreterFrame *>(buffer + 2 * sizeof(Value));
     fp->mark_ = mark;
     fp->initExecuteFrame(cx, script, evalInFrame, thisv, *scopeChain, type);
     fp->initVarsToUndefined();
     return fp;
 }
 /*****************************************************************************/
 /* MSVC PGO causes xpcshell startup crashes. */
 #if defined(_MSC_VER)
 # pragma optimize("g", off)
 #endif
 void
 FrameIter::popActivation()
 {
     ++data_.activations_;
     settleOnActivation();
 }
 void
 FrameIter::popInterpreterFrame()
 {
     JS_ASSERT(data_.state_ == INTERP);
     ++data_.interpFrames_;
     if (data_.interpFrames_.done())
         popActivation();
     else
         data_.pc_ = data_.interpFrames_.pc();
 }
 void
 FrameIter::settleOnActivation()
 {
     while (true) {
         if (data_.activations_.done()) {
             data_.state_ = DONE;
             return;
         }
         Activation *activation = data_.activations_.activation();
         // If JS_SaveFrameChain was called, stop iterating here (unless
         // GO_THROUGH_SAVED is set).
         if (data_.savedOption_ == STOP_AT_SAVED && activation->hasSavedFrameChain()) {
             data_.state_ = DONE;
             return;
         }
         // Skip activations from another context if needed.
         JS_ASSERT(activation->cx());
         JS_ASSERT(data_.cx_);
         if (data_.contextOption_ == CURRENT_CONTEXT && activation->cx() != data_.cx_) {
             ++data_.activations_;
             continue;
         }
         // If the caller supplied principals, only show activations which are subsumed (of the same
         // origin or of an origin accessible) by these principals.
         if (data_.principals_) {
             if (JSSubsumesOp subsumes = data_.cx_->runtime()->securityCallbacks->subsumes) {
                 JS::AutoAssertNoGC nogc;
                 if (!subsumes(data_.principals_, activation->compartment()->principals)) {
                     ++data_.activations_;
                     continue;
                 }
             }
         }
 #ifdef JS_ION
         if (activation->isJit()) {
             data_.jitFrames_ = jit::JitFrameIterator(data_.activations_);
             // Stop at the first scripted frame.
             while (!data_.jitFrames_.isScripted() && !data_.jitFrames_.done())
                 ++data_.jitFrames_;
             // It's possible to have an JitActivation with no scripted frames,
             // for instance if we hit an over-recursion during bailout.
             if (data_.jitFrames_.done()) {
                 ++data_.activations_;
                 continue;
             }
             nextJitFrame();
             data_.state_ = JIT;
             return;
         }
         if (activation->isAsmJS()) {
             data_.asmJSFrames_ = AsmJSFrameIterator(data_.activations_->asAsmJS());
             if (data_.asmJSFrames_.done()) {
                 ++data_.activations_;
                 continue;
             }
             data_.state_ = ASMJS;
             return;
         }
         // ForkJoin activations don't contain iterable frames, so skip them.
         if (activation->isForkJoin()) {
             ++data_.activations_;
             continue;
         }
 #endif
         JS_ASSERT(activation->isInterpreter());
         InterpreterActivation *interpAct = activation->asInterpreter();
         data_.interpFrames_ = InterpreterFrameIterator(interpAct);
         // If we OSR'ed into JIT code, skip the interpreter frame so that
         // the same frame is not reported twice.
         if (data_.interpFrames_.frame()->runningInJit()) {
             ++data_.interpFrames_;
             if (data_.interpFrames_.done()) {
                 ++data_.activations_;
                 continue;
             }
         }
         JS_ASSERT(!data_.interpFrames_.frame()->runningInJit());
         data_.pc_ = data_.interpFrames_.pc();
         data_.state_ = INTERP;
         return;
     }
 }
 FrameIter::Data::Data(JSContext *cx, SavedOption savedOption, ContextOption contextOption,
                       JSPrincipals *principals)
   : cx_(cx),
     savedOption_(savedOption),
     contextOption_(contextOption),
     principals_(principals),
     pc_(nullptr),
     interpFrames_(nullptr),
     activations_(cx->runtime())
 #ifdef JS_ION
   , jitFrames_((uint8_t *)nullptr, SequentialExecution)
   , ionInlineFrameNo_(0)
   , asmJSFrames_(nullptr)
 #endif
 {
 }
 FrameIter::Data::Data(const FrameIter::Data &other)
   : cx_(other.cx_),
     savedOption_(other.savedOption_),
     contextOption_(other.contextOption_),
     principals_(other.principals_),
     state_(other.state_),
     pc_(other.pc_),
     interpFrames_(other.interpFrames_),
     activations_(other.activations_)
 #ifdef JS_ION
   , jitFrames_(other.jitFrames_)
   , ionInlineFrameNo_(other.ionInlineFrameNo_)
   , asmJSFrames_(other.asmJSFrames_)
 #endif
 {
 }
 FrameIter::FrameIter(JSContext *cx, SavedOption savedOption)
   : data_(cx, savedOption, CURRENT_CONTEXT, nullptr)
 #ifdef JS_ION
   , ionInlineFrames_(cx, (js::jit::JitFrameIterator*) nullptr)
 #endif
 {
     // settleOnActivation can only GC if principals are given.
     JS::AutoAssertNoGC nogc;
     settleOnActivation();
 }
 FrameIter::FrameIter(JSContext *cx, ContextOption contextOption,
                      SavedOption savedOption, JSPrincipals *principals)
   : data_(cx, savedOption, contextOption, principals)
 #ifdef JS_ION
   , ionInlineFrames_(cx, (js::jit::JitFrameIterator*) nullptr)
 #endif
 {
     settleOnActivation();
 }
 FrameIter::FrameIter(const FrameIter &other)
   : data_(other.data_)
 #ifdef JS_ION
   , ionInlineFrames_(other.data_.cx_,
                      data_.jitFrames_.isIonJS() ? &other.ionInlineFrames_ : nullptr)
 #endif
 {
 }
 FrameIter::FrameIter(const Data &data)
   : data_(data)
 #ifdef JS_ION
   , ionInlineFrames_(data.cx_, data_.jitFrames_.isIonJS() ? &data_.jitFrames_ : nullptr)
 #endif
 {
     JS_ASSERT(data.cx_);
 #ifdef JS_ION
     if (data_.jitFrames_.isIonJS()) {
         while (ionInlineFrames_.frameNo() != data.ionInlineFrameNo_)
             ++ionInlineFrames_;
     }
 #endif
 }
 #ifdef JS_ION
 void
 FrameIter::nextJitFrame()
 {
     if (data_.jitFrames_.isIonJS()) {
         ionInlineFrames_.resetOn(&data_.jitFrames_);
         data_.pc_ = ionInlineFrames_.pc();
     } else {
         JS_ASSERT(data_.jitFrames_.isBaselineJS());
         data_.jitFrames_.baselineScriptAndPc(nullptr, &data_.pc_);
     }
 }
 void
 FrameIter::popJitFrame()
 {
     JS_ASSERT(data_.state_ == JIT);
     if (data_.jitFrames_.isIonJS() && ionInlineFrames_.more()) {
         ++ionInlineFrames_;
         data_.pc_ = ionInlineFrames_.pc();
         return;
     }
     ++data_.jitFrames_;
     while (!data_.jitFrames_.done() && !data_.jitFrames_.isScripted())
         ++data_.jitFrames_;
     if (!data_.jitFrames_.done()) {
         nextJitFrame();
         return;
     }
     popActivation();
 }
 void
 FrameIter::popAsmJSFrame()
 {
     JS_ASSERT(data_.state_ == ASMJS);
     ++data_.asmJSFrames_;
     if (data_.asmJSFrames_.done())
         popActivation();
 }
 #endif
 FrameIter &
 FrameIter::operator++()
 {
     switch (data_.state_) {
       case DONE:
         MOZ_ASSUME_UNREACHABLE("Unexpected state");
       case INTERP:
         if (interpFrame()->isDebuggerFrame() && interpFrame()->evalInFramePrev()) {
             AbstractFramePtr eifPrev = interpFrame()->evalInFramePrev();
             MOZ_ASSERT(!eifPrev.isRematerializedFrame());
             // Eval-in-frame can cross contexts and works across saved frame
             // chains.
             ContextOption prevContextOption = data_.contextOption_;
             SavedOption prevSavedOption = data_.savedOption_;
             data_.contextOption_ = ALL_CONTEXTS;
             data_.savedOption_ = GO_THROUGH_SAVED;
             popInterpreterFrame();
             while (isIon() || abstractFramePtr() != eifPrev) {
                 if (data_.state_ == JIT) {
 #ifdef JS_ION
                     popJitFrame();
 #else
                     MOZ_ASSUME_UNREACHABLE("Invalid state");
 #endif
                 } else {
                     popInterpreterFrame();
                 }
             }
             data_.contextOption_ = prevContextOption;
             data_.savedOption_ = prevSavedOption;
             data_.cx_ = data_.activations_->cx();
             break;
         }
         popInterpreterFrame();
         break;
 #ifdef JS_ION
       case JIT:
         popJitFrame();
         break;
       case ASMJS:
         popAsmJSFrame();
         break;
 #else
     default:
         MOZ_ASSUME_UNREACHABLE("Unexpected state");
 #endif
     }
     return *this;
 }
 FrameIter::Data *
 FrameIter::copyData() const
 {
     Data *data = data_.cx_->new_<Data>(data_);
 #ifdef JS_ION
     JS_ASSERT(data_.state_ != ASMJS);
     if (data && data_.jitFrames_.isIonJS())
         data->ionInlineFrameNo_ = ionInlineFrames_.frameNo();
 #endif
     return data;
 }
 AbstractFramePtr
 FrameIter::copyDataAsAbstractFramePtr() const
 {
     AbstractFramePtr frame;
     if (Data *data = copyData())
         frame.ptr_ = uintptr_t(data);
     return frame;
 }
 JSCompartment *
 FrameIter::compartment() const
 {
     switch (data_.state_) {
       case DONE:
         break;
       case INTERP:
       case JIT:
       case ASMJS:
         return data_.activations_->compartment();
     }
     MOZ_ASSUME_UNREACHABLE("Unexpected state");
 }
 bool
 FrameIter::isFunctionFrame() const
 {
     switch (data_.state_) {
       case DONE:
         break;
       case INTERP:
         return interpFrame()->isFunctionFrame();
       case JIT:
 #ifdef JS_ION
         JS_ASSERT(data_.jitFrames_.isScripted());
         if (data_.jitFrames_.isBaselineJS())
             return data_.jitFrames_.isFunctionFrame();
         return ionInlineFrames_.isFunctionFrame();
 #else
         break;
 #endif
       case ASMJS:
         return true;
     }
     MOZ_ASSUME_UNREACHABLE("Unexpected state");
 }
 bool
 FrameIter::isGlobalFrame() const
 {
     switch (data_.state_) {
       case DONE:
         break;
       case INTERP:
         return interpFrame()->isGlobalFrame();
       case JIT:
 #ifdef JS_ION
         if (data_.jitFrames_.isBaselineJS())
             return data_.jitFrames_.baselineFrame()->isGlobalFrame();
         JS_ASSERT(!script()->isForEval());
         return !script()->functionNonDelazifying();
 #else
         break;
 #endif
       case ASMJS:
         return false;
     }
     MOZ_ASSUME_UNREACHABLE("Unexpected state");
 }
 bool
 FrameIter::isEvalFrame() const
 {
     switch (data_.state_) {
       case DONE:
         break;
       case INTERP:
         return interpFrame()->isEvalFrame();
       case JIT:
 #ifdef JS_ION
         if (data_.jitFrames_.isBaselineJS())
             return data_.jitFrames_.baselineFrame()->isEvalFrame();
         JS_ASSERT(!script()->isForEval());
         return false;
 #else
         break;
 #endif
       case ASMJS:
         return false;
     }
     MOZ_ASSUME_UNREACHABLE("Unexpected state");
 }
 bool
 FrameIter::isNonEvalFunctionFrame() const
 {
     JS_ASSERT(!done());
     switch (data_.state_) {
       case DONE:
         break;
       case INTERP:
         return interpFrame()->isNonEvalFunctionFrame();
       case JIT:
         return !isEvalFrame() && isFunctionFrame();
       case ASMJS:
         return true;
     }
     MOZ_ASSUME_UNREACHABLE("Unexpected state");
 }
 bool
 FrameIter::isGeneratorFrame() const
 {
     switch (data_.state_) {
       case DONE:
         break;
       case INTERP:
         return interpFrame()->isGeneratorFrame();
       case JIT:
         return false;
       case ASMJS:
         return false;
     }
     MOZ_ASSUME_UNREACHABLE("Unexpected state");
 }
 JSAtom *
 FrameIter::functionDisplayAtom() const
 {
     JS_ASSERT(isNonEvalFunctionFrame());
     switch (data_.state_) {
       case DONE:
         break;
       case INTERP:
       case JIT:
         return callee()->displayAtom();
       case ASMJS: {
 #ifdef JS_ION
         return data_.asmJSFrames_.functionDisplayAtom();
 #else
         break;
 #endif
       }
     }
     MOZ_ASSUME_UNREACHABLE("Unexpected state");
 }
 ScriptSource *
 FrameIter::scriptSource() const
 {
     switch (data_.state_) {
       case DONE:
         break;
       case INTERP:
       case JIT:
         return script()->scriptSource();
       case ASMJS:
 #ifdef JS_ION
         return data_.activations_->asAsmJS()->module().scriptSource();
 #else
         break;
 #endif
     }
     MOZ_ASSUME_UNREACHABLE("Unexpected state");
 }
 const char *
 FrameIter::scriptFilename() const
 {
     switch (data_.state_) {
       case DONE:
         break;
       case INTERP:
       case JIT:
         return script()->filename();
       case ASMJS:
 #ifdef JS_ION
         return data_.activations_->asAsmJS()->module().scriptSource()->filename();
 #else
         break;
 #endif
     }
     MOZ_ASSUME_UNREACHABLE("Unexpected state");
 }
 unsigned
 FrameIter::computeLine(uint32_t *column) const
 {
     switch (data_.state_) {
       case DONE:
         break;
       case INTERP:
       case JIT:
         return PCToLineNumber(script(), pc(), column);
       case ASMJS:
 #ifdef JS_ION
         return data_.asmJSFrames_.computeLine(column);
 #else
         break;
 #endif
     }
     MOZ_ASSUME_UNREACHABLE("Unexpected state");
 }
 JSPrincipals *
 FrameIter::originPrincipals() const
 {
     switch (data_.state_) {
       case DONE:
         break;
       case INTERP:
       case JIT:
         return script()->originPrincipals();
       case ASMJS: {
 #ifdef JS_ION
         return data_.activations_->asAsmJS()->module().scriptSource()->originPrincipals();
 #else
         break;
 #endif
       }
     }
     MOZ_ASSUME_UNREACHABLE("Unexpected state");
 }
 bool
 FrameIter::isConstructing() const
 {
     switch (data_.state_) {
       case DONE:
       case ASMJS:
         break;
       case JIT:
 #ifdef JS_ION
         if (data_.jitFrames_.isIonJS())
             return ionInlineFrames_.isConstructing();
         JS_ASSERT(data_.jitFrames_.isBaselineJS());
         return data_.jitFrames_.isConstructing();
 #else
         break;
 #endif
       case INTERP:
         return interpFrame()->isConstructing();
     }
     MOZ_ASSUME_UNREACHABLE("Unexpected state");
 }
 bool
 FrameIter::ensureHasRematerializedFrame()
 {
 #ifdef JS_ION
     MOZ_ASSERT(isIon());
     return !!activation()->asJit()->getRematerializedFrame(activation()->cx(), data_.jitFrames_);
 #else
     return true;
 #endif
 }
 bool
 FrameIter::hasUsableAbstractFramePtr() const
 {
     switch (data_.state_) {
       case DONE:
       case ASMJS:
         return false;
       case JIT:
 #ifdef JS_ION
         if (data_.jitFrames_.isBaselineJS())
             return true;
         MOZ_ASSERT(data_.jitFrames_.isIonJS());
         return !!activation()->asJit()->lookupRematerializedFrame(data_.jitFrames_.fp(),
                                                                   ionInlineFrames_.frameNo());
 #endif
         break;
       case INTERP:
         return true;
     }
     MOZ_ASSUME_UNREACHABLE("Unexpected state");
 }
 AbstractFramePtr
 FrameIter::abstractFramePtr() const
 {
     MOZ_ASSERT(hasUsableAbstractFramePtr());
     switch (data_.state_) {
       case DONE:
       case ASMJS:
         break;
       case JIT: {
 #ifdef JS_ION
         if (data_.jitFrames_.isBaselineJS())
             return data_.jitFrames_.baselineFrame();
         MOZ_ASSERT(data_.jitFrames_.isIonJS());
         return activation()->asJit()->lookupRematerializedFrame(data_.jitFrames_.fp(),
                                                                 ionInlineFrames_.frameNo());
 #endif
         break;
       }
       case INTERP:
         JS_ASSERT(interpFrame());
         return AbstractFramePtr(interpFrame());
     }
     MOZ_ASSUME_UNREACHABLE("Unexpected state");
 }
 void
 FrameIter::updatePcQuadratic()
 {
     switch (data_.state_) {
       case DONE:
       case ASMJS:
         break;
       case INTERP: {
         InterpreterFrame *frame = interpFrame();
         InterpreterActivation *activation = data_.activations_->asInterpreter();
         // Look for the current frame.
         data_.interpFrames_ = InterpreterFrameIterator(activation);
         while (data_.interpFrames_.frame() != frame)
             ++data_.interpFrames_;
         // Update the pc.
         JS_ASSERT(data_.interpFrames_.frame() == frame);
         data_.pc_ = data_.interpFrames_.pc();
         return;
       }
       case JIT:
 #ifdef JS_ION
         if (data_.jitFrames_.isBaselineJS()) {
             jit::BaselineFrame *frame = data_.jitFrames_.baselineFrame();
             jit::JitActivation *activation = data_.activations_->asJit();
             // ActivationIterator::ionTop_ may be invalid, so create a new
             // activation iterator.
             data_.activations_ = ActivationIterator(data_.cx_->runtime());
             while (data_.activations_.activation() != activation)
                 ++data_.activations_;
             // Look for the current frame.
             data_.jitFrames_ = jit::JitFrameIterator(data_.activations_);
             while (!data_.jitFrames_.isBaselineJS() || data_.jitFrames_.baselineFrame() != frame)
                 ++data_.jitFrames_;
             // Update the pc.
             JS_ASSERT(data_.jitFrames_.baselineFrame() == frame);
             data_.jitFrames_.baselineScriptAndPc(nullptr, &data_.pc_);
             return;
         }
 #endif
         break;
     }
     MOZ_ASSUME_UNREACHABLE("Unexpected state");
 }
 JSFunction *
 FrameIter::callee() const
 {
     switch (data_.state_) {
       case DONE:
       case ASMJS:
         break;
       case INTERP:
         JS_ASSERT(isFunctionFrame());
         return &interpFrame()->callee();
       case JIT:
 #ifdef JS_ION
         if (data_.jitFrames_.isBaselineJS())
             return data_.jitFrames_.callee();
         JS_ASSERT(data_.jitFrames_.isIonJS());
         return ionInlineFrames_.callee();
 #else
         break;
 #endif
     }
     MOZ_ASSUME_UNREACHABLE("Unexpected state");
 }
 Value
 FrameIter::calleev() const
 {
     switch (data_.state_) {
       case DONE:
       case ASMJS:
         break;
       case INTERP:
         JS_ASSERT(isFunctionFrame());
         return interpFrame()->calleev();
       case JIT:
 #ifdef JS_ION
         return ObjectValue(*callee());
 #else
         break;
 #endif
     }
     MOZ_ASSUME_UNREACHABLE("Unexpected state");
 }
 unsigned
 FrameIter::numActualArgs() const
 {
     switch (data_.state_) {
       case DONE:
       case ASMJS:
         break;
       case INTERP:
         JS_ASSERT(isFunctionFrame());
         return interpFrame()->numActualArgs();
       case JIT:
 #ifdef JS_ION
         if (data_.jitFrames_.isIonJS())
             return ionInlineFrames_.numActualArgs();
         JS_ASSERT(data_.jitFrames_.isBaselineJS());
         return data_.jitFrames_.numActualArgs();
 #else
         break;
 #endif
     }
     MOZ_ASSUME_UNREACHABLE("Unexpected state");
 }
 unsigned
 FrameIter::numFormalArgs() const
 {
     return script()->functionNonDelazifying()->nargs();
 }
 Value
 FrameIter::unaliasedActual(unsigned i, MaybeCheckAliasing checkAliasing) const
 {
     return abstractFramePtr().unaliasedActual(i, checkAliasing);
 }
 JSObject *
 FrameIter::scopeChain() const
 {
     switch (data_.state_) {
       case DONE:
       case ASMJS:
         break;
       case JIT:
 #ifdef JS_ION
         if (data_.jitFrames_.isIonJS())
             return ionInlineFrames_.scopeChain();
         return data_.jitFrames_.baselineFrame()->scopeChain();
 #else
         break;
 #endif
       case INTERP:
         return interpFrame()->scopeChain();
     }
     MOZ_ASSUME_UNREACHABLE("Unexpected state");
 }
 CallObject &
 FrameIter::callObj() const
 {
     JS_ASSERT(callee()->isHeavyweight());
     JSObject *pobj = scopeChain();
     while (!pobj->is<CallObject>())
         pobj = pobj->enclosingScope();
     return pobj->as<CallObject>();
 }
 bool
 FrameIter::hasArgsObj() const
 {
     return abstractFramePtr().hasArgsObj();
 }
 ArgumentsObject &
 FrameIter::argsObj() const
 {
     MOZ_ASSERT(hasArgsObj());
     return abstractFramePtr().argsObj();
 }
 bool
 FrameIter::computeThis(JSContext *cx) const
 {
     JS_ASSERT(!done() && !isAsmJS());
     assertSameCompartment(cx, scopeChain());
     return ComputeThis(cx, abstractFramePtr());
 }
 Value
 FrameIter::computedThisValue() const
 {
     return abstractFramePtr().thisValue();
 }
 Value
 FrameIter::thisv() const
 {
     switch (data_.state_) {
       case DONE:
       case ASMJS:
         break;
       case JIT:
 #ifdef JS_ION
         if (data_.jitFrames_.isIonJS())
             return ionInlineFrames_.thisValue();
         return data_.jitFrames_.baselineFrame()->thisValue();
 #else
         break;
 #endif
       case INTERP:
         return interpFrame()->thisValue();
     }
     MOZ_ASSUME_UNREACHABLE("Unexpected state");
 }
 Value
 FrameIter::returnValue() const
 {
     switch (data_.state_) {
       case DONE:
       case ASMJS:
         break;
       case JIT:
 #ifdef JS_ION
         if (data_.jitFrames_.isBaselineJS())
             return data_.jitFrames_.baselineFrame()->returnValue();
 #endif
         break;
       case INTERP:
         return interpFrame()->returnValue();
     }
     MOZ_ASSUME_UNREACHABLE("Unexpected state");
 }
 void
 FrameIter::setReturnValue(const Value &v)
 {
     switch (data_.state_) {
       case DONE:
       case ASMJS:
         break;
       case JIT:
 #ifdef JS_ION
         if (data_.jitFrames_.isBaselineJS()) {
             data_.jitFrames_.baselineFrame()->setReturnValue(v);
             return;
         }
 #endif
         break;
       case INTERP:
         interpFrame()->setReturnValue(v);
         return;
     }
     MOZ_ASSUME_UNREACHABLE("Unexpected state");
 }
 size_t
 FrameIter::numFrameSlots() const
 {
     switch (data_.state_) {
       case DONE:
       case ASMJS:
         break;
       case JIT: {
 #ifdef JS_ION
         if (data_.jitFrames_.isIonJS()) {
             return ionInlineFrames_.snapshotIterator().numAllocations() -
                 ionInlineFrames_.script()->nfixed();
         }
         jit::BaselineFrame *frame = data_.jitFrames_.baselineFrame();
         return frame->numValueSlots() - data_.jitFrames_.script()->nfixed();
 #else
         break;
 #endif
       }
       case INTERP:
         JS_ASSERT(data_.interpFrames_.sp() >= interpFrame()->base());
         return data_.interpFrames_.sp() - interpFrame()->base();
     }
     MOZ_ASSUME_UNREACHABLE("Unexpected state");
 }
 Value
 FrameIter::frameSlotValue(size_t index) const
 {
     switch (data_.state_) {
       case DONE:
       case ASMJS:
         break;
       case JIT:
 #ifdef JS_ION
         if (data_.jitFrames_.isIonJS()) {
             jit::SnapshotIterator si(ionInlineFrames_.snapshotIterator());
             index += ionInlineFrames_.script()->nfixed();
             return si.maybeReadAllocByIndex(index);
         }
         index += data_.jitFrames_.script()->nfixed();
         return *data_.jitFrames_.baselineFrame()->valueSlot(index);
 #else
         break;
 #endif
       case INTERP:
           return interpFrame()->base()[index];
     }
     MOZ_ASSUME_UNREACHABLE("Unexpected state");
 }
 #if defined(_MSC_VER)
 # pragma optimize("", on)
 #endif
 #ifdef DEBUG
 bool
 js::SelfHostedFramesVisible()
 {
     static bool checked = false;
     static bool visible = false;
     if (!checked) {
         checked = true;
         char *env = getenv("MOZ_SHOW_ALL_JS_FRAMES");
         visible = !!env;
     }
     return visible;
 }
 #endif
 void
 NonBuiltinFrameIter::settle()
 {
     if (!SelfHostedFramesVisible()) {
         while (!done() && hasScript() && script()->selfHosted())
             FrameIter::operator++();
     }
 }
 void
 NonBuiltinScriptFrameIter::settle()
 {
     if (!SelfHostedFramesVisible()) {
         while (!done() && script()->selfHosted())
             ScriptFrameIter::operator++();
     }
 }
 /*****************************************************************************/
 JSObject *
 AbstractFramePtr::evalPrevScopeChain(JSContext *cx) const
 {
     // Eval frames are not compiled by Ion, though their caller might be.
     AllFramesIter iter(cx);
     while (iter.isIon() || iter.abstractFramePtr() != *this)
         ++iter;
     ++iter;
     return iter.scopeChain();
 }
 bool
 AbstractFramePtr::hasPushedSPSFrame() const
 {
     if (isInterpreterFrame())
         return asInterpreterFrame()->hasPushedSPSFrame();
 #ifdef JS_ION
     return asBaselineFrame()->hasPushedSPSFrame();
 #else
     MOZ_ASSUME_UNREACHABLE("Invalid frame");
 #endif
 }
 #ifdef DEBUG
 void
 js::CheckLocalUnaliased(MaybeCheckAliasing checkAliasing, JSScript *script, uint32_t i)
 {
     if (!checkAliasing)
         return;
     JS_ASSERT(i < script->nfixed());
     if (i < script->bindings.numVars()) {
         JS_ASSERT(!script->varIsAliased(i));
     } else {
         // FIXME: The callers of this function do not easily have the PC of the
         // current frame, and so they do not know the block scope.
     }
 }
 #endif
 jit::JitActivation::JitActivation(JSContext *cx, bool firstFrameIsConstructing, bool active)
   : Activation(cx, Jit),
     firstFrameIsConstructing_(firstFrameIsConstructing),
     active_(active)
 #ifdef JS_ION
   , rematerializedFrames_(cx)
 #endif
 {
     if (active) {
         prevIonTop_ = cx->mainThread().ionTop;
         prevJitJSContext_ = cx->mainThread().jitJSContext;
         cx->mainThread().jitJSContext = cx;
     } else {
         prevIonTop_ = nullptr;
         prevJitJSContext_ = nullptr;
     }
 }
 jit::JitActivation::~JitActivation()
 {
     if (active_) {
         cx_->mainThread().ionTop = prevIonTop_;
         cx_->mainThread().jitJSContext = prevJitJSContext_;
     }
 #ifdef JS_ION
     clearRematerializedFrames();
 #endif
 }
 // setActive() is inlined in GenerateFFIIonExit() with explicit masm instructions so
 // changes to the logic here need to be reflected in GenerateFFIIonExit() in the enable
 // and disable activation instruction sequences.
 void
 jit::JitActivation::setActive(JSContext *cx, bool active)
 {
     // Only allowed to deactivate/activate if activation is top.
     // (Not tested and will probably fail in other situations.)
     JS_ASSERT(cx->mainThread().activation_ == this);
     JS_ASSERT(active != active_);
     active_ = active;
     if (active) {
         prevIonTop_ = cx->mainThread().ionTop;
         prevJitJSContext_ = cx->mainThread().jitJSContext;
         cx->mainThread().jitJSContext = cx;
     } else {
         cx->mainThread().ionTop = prevIonTop_;
         cx->mainThread().jitJSContext = prevJitJSContext_;
     }
 }
 #ifdef JS_ION
 void
 jit::JitActivation::freeRematerializedFramesInVector(RematerializedFrameVector &frames)
 {
     for (size_t i = 0; i < frames.length(); i++) {
         RematerializedFrame *f = frames[i];
         f->RematerializedFrame::~RematerializedFrame();
         js_free(f);
     }
     frames.clear();
 }
 void
 jit::JitActivation::removeRematerializedFrame(uint8_t *top)
 {
     if (!rematerializedFrames_.initialized())
         return;
     if (RematerializedFrameTable::Ptr p = rematerializedFrames_.lookup(top)) {
         freeRematerializedFramesInVector(p->value());
         rematerializedFrames_.remove(p);
     }
 }
 void
 jit::JitActivation::clearRematerializedFrames()
 {
     if (!rematerializedFrames_.initialized())
         return;
     for (RematerializedFrameTable::Enum e(rematerializedFrames_); !e.empty(); e.popFront()) {
         freeRematerializedFramesInVector(e.front().value());
         e.removeFront();
     }
 }
 jit::RematerializedFrame *
 jit::JitActivation::getRematerializedFrame(JSContext *cx, JitFrameIterator &iter,
                                            size_t inlineDepth)
 {
     MOZ_ASSERT(iter.activation() == this);
     MOZ_ASSERT(iter.isIonJS());
     if (!rematerializedFrames_.initialized() && !rematerializedFrames_.init())
         return nullptr;
     // The unit of rematerialization is an uninlined frame and its inlined
     // frames. Since inlined frames do not exist outside of snapshots, it is
     // impossible to synchronize their rematerialized copies to preserve
     // identity. Therefore, we always rematerialize an uninlined frame and all
     // its inlined frames at once.
     uint8_t *top = iter.fp();
     RematerializedFrameTable::AddPtr p = rematerializedFrames_.lookupForAdd(top);
     if (!p) {
         RematerializedFrameVector empty(cx);
         if (!rematerializedFrames_.add(p, top, Move(empty)))
             return nullptr;
         InlineFrameIterator inlineIter(cx, &iter);
         if (!p->value().resize(inlineIter.frameCount()))
             return nullptr;
         while (true) {
             size_t frameNo = inlineIter.frameNo();
             p->value()[frameNo] = RematerializedFrame::New(cx, top, inlineIter);
             if (!p->value()[frameNo])
                 return nullptr;
             if (!inlineIter.more())
                 break;
             ++inlineIter;
         }
     }
     return p->value()[inlineDepth];
 }
 jit::RematerializedFrame *
 jit::JitActivation::lookupRematerializedFrame(uint8_t *top, size_t inlineDepth)
 {
     if (!rematerializedFrames_.initialized())
         return nullptr;
     if (RematerializedFrameTable::Ptr p = rematerializedFrames_.lookup(top))
         return inlineDepth < p->value().length() ? p->value()[inlineDepth] : nullptr;
     return nullptr;
 }
 void
 jit::JitActivation::markRematerializedFrames(JSTracer *trc)
 {
     if (!rematerializedFrames_.initialized())
         return;
     for (RematerializedFrameTable::Enum e(rematerializedFrames_); !e.empty(); e.popFront()) {
         RematerializedFrameVector &frames = e.front().value();
         for (size_t i = 0; i < frames.length(); i++)
             frames[i]->mark(trc);
     }
 }
 #endif // JS_ION
 AsmJSActivation::AsmJSActivation(JSContext *cx, AsmJSModule &module)
   : Activation(cx, AsmJS),
     module_(module),
     errorRejoinSP_(nullptr),
     profiler_(nullptr),
     resumePC_(nullptr),
     exitSP_(nullptr)
 {
     if (cx->runtime()->spsProfiler.enabled()) {
         // Use a profiler string that matches jsMatch regex in
         // browser/devtools/profiler/cleopatra/js/parserWorker.js.
         // (For now use a single static string to avoid further slowing down
         // calls into asm.js.)
         profiler_ = &cx->runtime()->spsProfiler;
         profiler_->enterNative("asm.js code :0", this);
     }
     prevAsmJS_ = cx_->runtime()->mainThread.asmJSActivationStack_;
     JSRuntime::AutoLockForInterrupt lock(cx_->runtime());
     cx_->runtime()->mainThread.asmJSActivationStack_ = this;
     (void) errorRejoinSP_;  // squelch GCC warning
 }
 AsmJSActivation::~AsmJSActivation()
 {
     if (profiler_)
         profiler_->exitNative();
     JS_ASSERT(cx_->runtime()->mainThread.asmJSActivationStack_ == this);
     JSRuntime::AutoLockForInterrupt lock(cx_->runtime());
     cx_->runtime()->mainThread.asmJSActivationStack_ = prevAsmJS_;
 }
 InterpreterFrameIterator &
 InterpreterFrameIterator::operator++()
 {
     JS_ASSERT(!done());
     if (fp_ != activation_->entryFrame_) {
         pc_ = fp_->prevpc();
         sp_ = fp_->prevsp();
         fp_ = fp_->prev();
     } else {
         pc_ = nullptr;
         sp_ = nullptr;
         fp_ = nullptr;
     }
     return *this;
 }
 ActivationIterator::ActivationIterator(JSRuntime *rt)
   : jitTop_(rt->mainThread.ionTop),
     activation_(rt->mainThread.activation_)
 {
     settle();
 }
 ActivationIterator &
 ActivationIterator::operator++()
 {
     JS_ASSERT(activation_);
     if (activation_->isJit() && activation_->asJit()->isActive())
         jitTop_ = activation_->asJit()->prevIonTop();
     activation_ = activation_->prev();
     settle();
     return *this;
 }
 void
 ActivationIterator::settle()
 {
     // Stop at the next active activation. No need to update jitTop_, since
     // we don't iterate over an active jit activation.
     while (!done() && activation_->isJit() && !activation_->asJit()->isActive())
         activation_ = activation_->prev();
 }

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js/src/vm/Stack.cpp@129ffea94266 (annotated)

js/src/vm/Stack.cpp