Stack-inl.h

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 * vim: set ts=8 sts=2 et sw=2 tw=80:
 * 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/. */

#ifndef vm_Stack_inl_h
#define vm_Stack_inl_h

#include "vm/Stack.h"

#include "mozilla/Maybe.h"
#include "mozilla/PodOperations.h"

#include "jit/BaselineFrame.h"
#include "jit/RematerializedFrame.h"
#include "js/Debug.h"
#include "vm/EnvironmentObject.h"
#include "vm/FrameIter.h"  // js::FrameIter
#include "vm/JSContext.h"
#include "vm/JSScript.h"

#include "jit/BaselineFrame-inl.h"
#include "jit/RematerializedFrame-inl.h"  // js::jit::RematerializedFrame::unsetIsDebuggee
#include "vm/JSObject-inl.h"
#include "vm/JSScript-inl.h"
#include "vm/NativeObject-inl.h"

namespace js {

inline HandleObject InterpreterFrame::environmentChain() const {
  return HandleObject::fromMarkedLocation(&envChain_);
}

inline GlobalObject& InterpreterFrame::global() const {
  return script()->global();
}

inline JSObject& InterpreterFrame::varObj() const {
  return GetVariablesObject(environmentChain());
}

inline LexicalEnvironmentObject&
InterpreterFrame::extensibleLexicalEnvironment() const {
  return NearestEnclosingExtensibleLexicalEnvironment(environmentChain());
}

inline void InterpreterFrame::initCallFrame(InterpreterFrame* prev,
                                            jsbytecode* prevpc, Value* prevsp,
                                            JSFunction& callee,
                                            JSScript* script, Value* argv,
                                            uint32_t nactual,
                                            MaybeConstruct constructing) {
  MOZ_ASSERT(callee.nonLazyScript() == script);

  /* Initialize stack frame members. */
  flags_ = 0;
  if (constructing) {
    flags_ |= CONSTRUCTING;
  }
  argv_ = argv;
  script_ = script;
  nactual_ = nactual;
  envChain_ = callee.environment();
  prev_ = prev;
  prevpc_ = prevpc;
  prevsp_ = prevsp;

  if (script->isDebuggee()) {
    setIsDebuggee();
  }

  initLocals();
}

inline void InterpreterFrame::initLocals() {
  SetValueRangeToUndefined(slots(), script()->nfixed());
}

inline Value& InterpreterFrame::unaliasedLocal(uint32_t i) {
  MOZ_ASSERT(i < script()->nfixed());
  return slots()[i];
}

inline Value& InterpreterFrame::unaliasedFormal(
    unsigned i, MaybeCheckAliasing checkAliasing) {
  MOZ_ASSERT(i < numFormalArgs());
  MOZ_ASSERT_IF(checkAliasing, !script()->argsObjAliasesFormals());
  MOZ_ASSERT_IF(checkAliasing, !script()->formalIsAliased(i));
  return argv()[i];
}

inline Value& InterpreterFrame::unaliasedActual(
    unsigned i, MaybeCheckAliasing checkAliasing) {
  MOZ_ASSERT(i < numActualArgs());
  MOZ_ASSERT_IF(checkAliasing, !script()->argsObjAliasesFormals());
  MOZ_ASSERT_IF(checkAliasing && i < numFormalArgs(),
                !script()->formalIsAliased(i));
  return argv()[i];
}

template <class Op>
inline void InterpreterFrame::unaliasedForEachActual(Op op) {
  // Don't assert !script()->funHasAnyAliasedFormal() since this function is
  // called from ArgumentsObject::createUnexpected() which can access aliased
  // slots.

  const Value* argsEnd = argv() + numActualArgs();
  for (const Value* p = argv(); p < argsEnd; ++p) {
    op(*p);
  }
}

struct CopyTo {
  Value* dst;
  explicit CopyTo(Value* dst) : dst(dst) {}
  void operator()(const Value& src) { *dst++ = src; }
};

struct CopyToHeap {
  GCPtrValue* dst;
  explicit CopyToHeap(GCPtrValue* dst) : dst(dst) {}
  void operator()(const Value& src) {
    dst->init(src);
    ++dst;
  }
};

inline ArgumentsObject& InterpreterFrame::argsObj() const {
  MOZ_ASSERT(script()->needsArgsObj());
  MOZ_ASSERT(flags_ & HAS_ARGS_OBJ);
  return *argsObj_;
}

inline void InterpreterFrame::initArgsObj(ArgumentsObject& argsobj) {
  MOZ_ASSERT(script()->needsArgsObj());
  flags_ |= HAS_ARGS_OBJ;
  argsObj_ = &argsobj;
}

inline EnvironmentObject& InterpreterFrame::aliasedEnvironment(
    EnvironmentCoordinate ec) const {
  JSObject* env = &environmentChain()->as<EnvironmentObject>();
  for (unsigned i = ec.hops(); i; i--) {
    env = &env->as<EnvironmentObject>().enclosingEnvironment();
  }
  return env->as<EnvironmentObject>();
}

template <typename SpecificEnvironment>
inline void InterpreterFrame::pushOnEnvironmentChain(SpecificEnvironment& env) {
  MOZ_ASSERT(*environmentChain() == env.enclosingEnvironment());
  envChain_ = &env;
  if (IsFrameInitialEnvironment(this, env)) {
    flags_ |= HAS_INITIAL_ENV;
  }
}

template <typename SpecificEnvironment>
inline void InterpreterFrame::popOffEnvironmentChain() {
  MOZ_ASSERT(envChain_->is<SpecificEnvironment>());
  envChain_ = &envChain_->as<SpecificEnvironment>().enclosingEnvironment();
}

inline void InterpreterFrame::replaceInnermostEnvironment(
    EnvironmentObject& env) {
  MOZ_ASSERT(env.enclosingEnvironment() ==
             envChain_->as<EnvironmentObject>().enclosingEnvironment());
  envChain_ = &env;
}

bool InterpreterFrame::hasInitialEnvironment() const {
  MOZ_ASSERT(script()->initialEnvironmentShape());
  return flags_ & HAS_INITIAL_ENV;
}

inline CallObject& InterpreterFrame::callObj() const {
  MOZ_ASSERT(callee().needsCallObject());

  JSObject* pobj = environmentChain();
  while (MOZ_UNLIKELY(!pobj->is<CallObject>())) {
    pobj = pobj->enclosingEnvironment();
  }
  return pobj->as<CallObject>();
}

inline void InterpreterFrame::unsetIsDebuggee() {
  MOZ_ASSERT(!script()->isDebuggee());
  flags_ &= ~DEBUGGEE;
}

/*****************************************************************************/

inline void InterpreterStack::purge(JSRuntime* rt) {
  rt->gc.queueUnusedLifoBlocksForFree(&allocator_);
}

uint8_t* InterpreterStack::allocateFrame(JSContext* cx, size_t size) {
  size_t maxFrames;
  if (cx->realm()->principals() == cx->runtime()->trustedPrincipals()) {
    maxFrames = MAX_FRAMES_TRUSTED;
  } else {
    maxFrames = MAX_FRAMES;
  }

  if (MOZ_UNLIKELY(frameCount_ >= maxFrames)) {
    ReportOverRecursed(cx);
    return nullptr;
  }

  uint8_t* buffer = reinterpret_cast<uint8_t*>(allocator_.alloc(size));
  if (!buffer) {
    ReportOutOfMemory(cx);
    return nullptr;
  }

  frameCount_++;
  return buffer;
}

MOZ_ALWAYS_INLINE InterpreterFrame* InterpreterStack::getCallFrame(
    JSContext* cx, const CallArgs& args, HandleScript script,
    MaybeConstruct constructing, Value** pargv) {
  JSFunction* fun = &args.callee().as<JSFunction>();

  MOZ_ASSERT(fun->nonLazyScript() == script);
  unsigned nformal = fun->nargs();
  unsigned nvals = script->nslots();

  if (args.length() >= nformal) {
    *pargv = args.array();
    uint8_t* buffer =
        allocateFrame(cx, sizeof(InterpreterFrame) + nvals * sizeof(Value));
    return reinterpret_cast<InterpreterFrame*>(buffer);
  }

  // Pad any missing arguments with |undefined|.
  MOZ_ASSERT(args.length() < nformal);

  unsigned nfunctionState = 2 + constructing;  // callee, |this|, |new.target|

  nvals += nformal + nfunctionState;
  uint8_t* buffer =
      allocateFrame(cx, sizeof(InterpreterFrame) + nvals * sizeof(Value));
  if (!buffer) {
    return nullptr;
  }

  Value* argv = reinterpret_cast<Value*>(buffer);
  unsigned nmissing = nformal - args.length();

  mozilla::PodCopy(argv, args.base(), 2 + args.length());
  SetValueRangeToUndefined(argv + 2 + args.length(), nmissing);

  if (constructing) {
    argv[2 + nformal] = args.newTarget();
  }

  *pargv = argv + 2;
  return reinterpret_cast<InterpreterFrame*>(argv + nfunctionState + nformal);
}

MOZ_ALWAYS_INLINE bool InterpreterStack::pushInlineFrame(
    JSContext* cx, InterpreterRegs& regs, const CallArgs& args,
    HandleScript script, MaybeConstruct constructing) {
  RootedFunction callee(cx, &args.callee().as<JSFunction>());
  MOZ_ASSERT(regs.sp == args.end());
  MOZ_ASSERT(callee->nonLazyScript() == script);

  InterpreterFrame* prev = regs.fp();
  jsbytecode* prevpc = regs.pc;
  Value* prevsp = regs.sp;
  MOZ_ASSERT(prev);

  LifoAlloc::Mark mark = allocator_.mark();

  Value* argv;
  InterpreterFrame* fp = getCallFrame(cx, args, script, constructing, &argv);
  if (!fp) {
    return false;
  }

  fp->mark_ = mark;

  /* Initialize frame, locals, regs. */
  fp->initCallFrame(prev, prevpc, prevsp, *callee, script, argv, args.length(),
                    constructing);

  regs.prepareToRun(*fp, script);
  return true;
}

MOZ_ALWAYS_INLINE bool InterpreterStack::resumeGeneratorCallFrame(
    JSContext* cx, InterpreterRegs& regs, HandleFunction callee,
    HandleObject envChain) {
  MOZ_ASSERT(callee->isGenerator() || callee->isAsync());
  RootedScript script(cx, callee->nonLazyScript());
  InterpreterFrame* prev = regs.fp();
  jsbytecode* prevpc = regs.pc;
  Value* prevsp = regs.sp;
  MOZ_ASSERT(prev);

  LifoAlloc::Mark mark = allocator_.mark();

  // (Async) generators and async functions are not constructors.
  MOZ_ASSERT(!callee->isConstructor());

  // Include callee, |this|, and maybe |new.target|
  unsigned nformal = callee->nargs();
  unsigned nvals = 2 + nformal + script->nslots();

  uint8_t* buffer =
      allocateFrame(cx, sizeof(InterpreterFrame) + nvals * sizeof(Value));
  if (!buffer) {
    return false;
  }

  Value* argv = reinterpret_cast<Value*>(buffer) + 2;
  argv[-2] = ObjectValue(*callee);
  argv[-1] = UndefinedValue();
  SetValueRangeToUndefined(argv, nformal);

  InterpreterFrame* fp = reinterpret_cast<InterpreterFrame*>(argv + nformal);
  fp->mark_ = mark;
  fp->initCallFrame(prev, prevpc, prevsp, *callee, script, argv, 0,
                    NO_CONSTRUCT);
  fp->resumeGeneratorFrame(envChain);

  regs.prepareToRun(*fp, script);
  return true;
}

MOZ_ALWAYS_INLINE void InterpreterStack::popInlineFrame(InterpreterRegs& regs) {
  InterpreterFrame* fp = regs.fp();
  regs.popInlineFrame();
  regs.sp[-1] = fp->returnValue();
  releaseFrame(fp);
  MOZ_ASSERT(regs.fp());
}

inline HandleValue AbstractFramePtr::returnValue() const {
  if (isInterpreterFrame()) {
    return asInterpreterFrame()->returnValue();
  }
  if (isWasmDebugFrame()) {
    return asWasmDebugFrame()->returnValue();
  }
  return asBaselineFrame()->returnValue();
}

inline void AbstractFramePtr::setReturnValue(const Value& rval) const {
  if (isInterpreterFrame()) {
    asInterpreterFrame()->setReturnValue(rval);
    return;
  }
  if (isBaselineFrame()) {
    asBaselineFrame()->setReturnValue(rval);
    return;
  }
  if (isWasmDebugFrame()) {
    // TODO handle wasm function return value
    // The function is called from Debugger::slowPathOnLeaveFrame --
    // ignoring value for wasm.
    return;
  }
  asRematerializedFrame()->setReturnValue(rval);
}

inline JSObject* AbstractFramePtr::environmentChain() const {
  if (isInterpreterFrame()) {
    return asInterpreterFrame()->environmentChain();
  }
  if (isBaselineFrame()) {
    return asBaselineFrame()->environmentChain();
  }
  if (isWasmDebugFrame()) {
    return &global()->lexicalEnvironment();
  }
  return asRematerializedFrame()->environmentChain();
}

template <typename SpecificEnvironment>
inline void AbstractFramePtr::pushOnEnvironmentChain(SpecificEnvironment& env) {
  if (isInterpreterFrame()) {
    asInterpreterFrame()->pushOnEnvironmentChain(env);
    return;
  }
  if (isBaselineFrame()) {
    asBaselineFrame()->pushOnEnvironmentChain(env);
    return;
  }
  asRematerializedFrame()->pushOnEnvironmentChain(env);
}

template <typename SpecificEnvironment>
inline void AbstractFramePtr::popOffEnvironmentChain() {
  if (isInterpreterFrame()) {
    asInterpreterFrame()->popOffEnvironmentChain<SpecificEnvironment>();
    return;
  }
  if (isBaselineFrame()) {
    asBaselineFrame()->popOffEnvironmentChain<SpecificEnvironment>();
    return;
  }
  asRematerializedFrame()->popOffEnvironmentChain<SpecificEnvironment>();
}

inline CallObject& AbstractFramePtr::callObj() const {
  if (isInterpreterFrame()) {
    return asInterpreterFrame()->callObj();
  }
  if (isBaselineFrame()) {
    return asBaselineFrame()->callObj();
  }
  return asRematerializedFrame()->callObj();
}

inline bool AbstractFramePtr::initFunctionEnvironmentObjects(JSContext* cx) {
  return js::InitFunctionEnvironmentObjects(cx, *this);
}

inline bool AbstractFramePtr::pushVarEnvironment(JSContext* cx,
                                                 HandleScope scope) {
  return js::PushVarEnvironmentObject(cx, scope, *this);
}

inline JS::Realm* AbstractFramePtr::realm() const {
  return environmentChain()->nonCCWRealm();
}

inline unsigned AbstractFramePtr::numActualArgs() const {
  if (isInterpreterFrame()) {
    return asInterpreterFrame()->numActualArgs();
  }
  if (isBaselineFrame()) {
    return asBaselineFrame()->numActualArgs();
  }
  return asRematerializedFrame()->numActualArgs();
}

inline unsigned AbstractFramePtr::numFormalArgs() const {
  if (isInterpreterFrame()) {
    return asInterpreterFrame()->numFormalArgs();
  }
  if (isBaselineFrame()) {
    return asBaselineFrame()->numFormalArgs();
  }
  return asRematerializedFrame()->numFormalArgs();
}

inline Value& AbstractFramePtr::unaliasedLocal(uint32_t i) {
  if (isInterpreterFrame()) {
    return asInterpreterFrame()->unaliasedLocal(i);
  }
  if (isBaselineFrame()) {
    return asBaselineFrame()->unaliasedLocal(i);
  }
  return asRematerializedFrame()->unaliasedLocal(i);
}

inline Value& AbstractFramePtr::unaliasedFormal(
    unsigned i, MaybeCheckAliasing checkAliasing) {
  if (isInterpreterFrame()) {
    return asInterpreterFrame()->unaliasedFormal(i, checkAliasing);
  }
  if (isBaselineFrame()) {
    return asBaselineFrame()->unaliasedFormal(i, checkAliasing);
  }
  return asRematerializedFrame()->unaliasedFormal(i, checkAliasing);
}

inline Value& AbstractFramePtr::unaliasedActual(
    unsigned i, MaybeCheckAliasing checkAliasing) {
  if (isInterpreterFrame()) {
    return asInterpreterFrame()->unaliasedActual(i, checkAliasing);
  }
  if (isBaselineFrame()) {
    return asBaselineFrame()->unaliasedActual(i, checkAliasing);
  }
  return asRematerializedFrame()->unaliasedActual(i, checkAliasing);
}

inline bool AbstractFramePtr::hasInitialEnvironment() const {
  if (isInterpreterFrame()) {
    return asInterpreterFrame()->hasInitialEnvironment();
  }
  if (isBaselineFrame()) {
    return asBaselineFrame()->hasInitialEnvironment();
  }
  return asRematerializedFrame()->hasInitialEnvironment();
}

inline bool AbstractFramePtr::isGlobalFrame() const {
  if (isInterpreterFrame()) {
    return asInterpreterFrame()->isGlobalFrame();
  }
  if (isBaselineFrame()) {
    return asBaselineFrame()->isGlobalFrame();
  }
  if (isWasmDebugFrame()) {
    return false;
  }
  return asRematerializedFrame()->isGlobalFrame();
}

inline bool AbstractFramePtr::isModuleFrame() const {
  if (isInterpreterFrame()) {
    return asInterpreterFrame()->isModuleFrame();
  }
  if (isBaselineFrame()) {
    return asBaselineFrame()->isModuleFrame();
  }
  if (isWasmDebugFrame()) {
    return false;
  }
  return asRematerializedFrame()->isModuleFrame();
}

inline bool AbstractFramePtr::isEvalFrame() const {
  if (isInterpreterFrame()) {
    return asInterpreterFrame()->isEvalFrame();
  }
  if (isBaselineFrame()) {
    return asBaselineFrame()->isEvalFrame();
  }
  if (isWasmDebugFrame()) {
    return false;
  }
  MOZ_ASSERT(isRematerializedFrame());
  return false;
}

inline bool AbstractFramePtr::isDebuggerEvalFrame() const {
  if (isInterpreterFrame()) {
    return asInterpreterFrame()->isDebuggerEvalFrame();
  }
  if (isBaselineFrame()) {
    return asBaselineFrame()->isDebuggerEvalFrame();
  }
  MOZ_ASSERT(isRematerializedFrame());
  return false;
}

inline bool AbstractFramePtr::isDebuggee() const {
  if (isInterpreterFrame()) {
    return asInterpreterFrame()->isDebuggee();
  }
  if (isBaselineFrame()) {
    return asBaselineFrame()->isDebuggee();
  }
  if (isWasmDebugFrame()) {
    return asWasmDebugFrame()->isDebuggee();
  }
  return asRematerializedFrame()->isDebuggee();
}

inline void AbstractFramePtr::setIsDebuggee() {
  if (isInterpreterFrame()) {
    asInterpreterFrame()->setIsDebuggee();
  } else if (isBaselineFrame()) {
    asBaselineFrame()->setIsDebuggee();
  } else if (isWasmDebugFrame()) {
    asWasmDebugFrame()->setIsDebuggee();
  } else {
    asRematerializedFrame()->setIsDebuggee();
  }
}

inline void AbstractFramePtr::unsetIsDebuggee() {
  if (isInterpreterFrame()) {
    asInterpreterFrame()->unsetIsDebuggee();
  } else if (isBaselineFrame()) {
    asBaselineFrame()->unsetIsDebuggee();
  } else if (isWasmDebugFrame()) {
    asWasmDebugFrame()->unsetIsDebuggee();
  } else {
    asRematerializedFrame()->unsetIsDebuggee();
  }
}

inline bool AbstractFramePtr::isConstructing() const {
  if (isInterpreterFrame()) {
    return asInterpreterFrame()->isConstructing();
  }
  if (isBaselineFrame()) {
    return asBaselineFrame()->isConstructing();
  }
  if (isRematerializedFrame()) {
    return asRematerializedFrame()->isConstructing();
  }
  MOZ_CRASH("Unexpected frame");
}

inline bool AbstractFramePtr::hasArgs() const { return isFunctionFrame(); }

inline bool AbstractFramePtr::hasScript() const { return !isWasmDebugFrame(); }

inline JSScript* AbstractFramePtr::script() const {
  if (isInterpreterFrame()) {
    return asInterpreterFrame()->script();
  }
  if (isBaselineFrame()) {
    return asBaselineFrame()->script();
  }
  return asRematerializedFrame()->script();
}

inline wasm::Instance* AbstractFramePtr::wasmInstance() const {
  return asWasmDebugFrame()->instance();
}

inline GlobalObject* AbstractFramePtr::global() const {
  if (isWasmDebugFrame()) {
    return asWasmDebugFrame()->global();
  }
  return &script()->global();
}

inline bool AbstractFramePtr::hasGlobal(const GlobalObject* global) const {
  if (isWasmDebugFrame()) {
    return asWasmDebugFrame()->hasGlobal(global);
  }
  return script()->hasGlobal(global);
}

inline JSFunction* AbstractFramePtr::callee() const {
  if (isInterpreterFrame()) {
    return &asInterpreterFrame()->callee();
  }
  if (isBaselineFrame()) {
    return asBaselineFrame()->callee();
  }
  return asRematerializedFrame()->callee();
}

inline Value AbstractFramePtr::calleev() const {
  if (isInterpreterFrame()) {
    return asInterpreterFrame()->calleev();
  }
  if (isBaselineFrame()) {
    return asBaselineFrame()->calleev();
  }
  return asRematerializedFrame()->calleev();
}

inline bool AbstractFramePtr::isFunctionFrame() const {
  if (isInterpreterFrame()) {
    return asInterpreterFrame()->isFunctionFrame();
  }
  if (isBaselineFrame()) {
    return asBaselineFrame()->isFunctionFrame();
  }
  if (isWasmDebugFrame()) {
    return false;
  }
  return asRematerializedFrame()->isFunctionFrame();
}

inline bool AbstractFramePtr::isGeneratorFrame() const {
  if (!isFunctionFrame()) {
    return false;
  }
  JSScript* s = script();
  return s->isGenerator() || s->isAsync();
}

inline bool AbstractFramePtr::isNonStrictDirectEvalFrame() const {
  if (isInterpreterFrame()) {
    return asInterpreterFrame()->isNonStrictDirectEvalFrame();
  }
  if (isBaselineFrame()) {
    return asBaselineFrame()->isNonStrictDirectEvalFrame();
  }
  MOZ_ASSERT(isRematerializedFrame());
  return false;
}

inline bool AbstractFramePtr::isStrictEvalFrame() const {
  if (isInterpreterFrame()) {
    return asInterpreterFrame()->isStrictEvalFrame();
  }
  if (isBaselineFrame()) {
    return asBaselineFrame()->isStrictEvalFrame();
  }
  MOZ_ASSERT(isRematerializedFrame());
  return false;
}

inline Value* AbstractFramePtr::argv() const {
  if (isInterpreterFrame()) {
    return asInterpreterFrame()->argv();
  }
  if (isBaselineFrame()) {
    return asBaselineFrame()->argv();
  }
  return asRematerializedFrame()->argv();
}

inline bool AbstractFramePtr::hasArgsObj() const {
  if (isInterpreterFrame()) {
    return asInterpreterFrame()->hasArgsObj();
  }
  if (isBaselineFrame()) {
    return asBaselineFrame()->hasArgsObj();
  }
  return asRematerializedFrame()->hasArgsObj();
}

inline ArgumentsObject& AbstractFramePtr::argsObj() const {
  if (isInterpreterFrame()) {
    return asInterpreterFrame()->argsObj();
  }
  if (isBaselineFrame()) {
    return asBaselineFrame()->argsObj();
  }
  return asRematerializedFrame()->argsObj();
}

inline void AbstractFramePtr::initArgsObj(ArgumentsObject& argsobj) const {
  if (isInterpreterFrame()) {
    asInterpreterFrame()->initArgsObj(argsobj);
    return;
  }
  asBaselineFrame()->initArgsObj(argsobj);
}

inline bool AbstractFramePtr::prevUpToDate() const {
  if (isInterpreterFrame()) {
    return asInterpreterFrame()->prevUpToDate();
  }
  if (isBaselineFrame()) {
    return asBaselineFrame()->prevUpToDate();
  }
  if (isWasmDebugFrame()) {
    return asWasmDebugFrame()->prevUpToDate();
  }
  return asRematerializedFrame()->prevUpToDate();
}

inline void AbstractFramePtr::setPrevUpToDate() const {
  if (isInterpreterFrame()) {
    asInterpreterFrame()->setPrevUpToDate();
    return;
  }
  if (isBaselineFrame()) {
    asBaselineFrame()->setPrevUpToDate();
    return;
  }
  if (isWasmDebugFrame()) {
    asWasmDebugFrame()->setPrevUpToDate();
    return;
  }
  asRematerializedFrame()->setPrevUpToDate();
}

inline void AbstractFramePtr::unsetPrevUpToDate() const {
  if (isInterpreterFrame()) {
    asInterpreterFrame()->unsetPrevUpToDate();
    return;
  }
  if (isBaselineFrame()) {
    asBaselineFrame()->unsetPrevUpToDate();
    return;
  }
  if (isWasmDebugFrame()) {
    asWasmDebugFrame()->unsetPrevUpToDate();
    return;
  }
  asRematerializedFrame()->unsetPrevUpToDate();
}

inline Value& AbstractFramePtr::thisArgument() const {
  if (isInterpreterFrame()) {
    return asInterpreterFrame()->thisArgument();
  }
  if (isBaselineFrame()) {
    return asBaselineFrame()->thisArgument();
  }
  return asRematerializedFrame()->thisArgument();
}

inline Value AbstractFramePtr::newTarget() const {
  if (isInterpreterFrame()) {
    return asInterpreterFrame()->newTarget();
  }
  if (isBaselineFrame()) {
    return asBaselineFrame()->newTarget();
  }
  return asRematerializedFrame()->newTarget();
}

inline bool AbstractFramePtr::debuggerNeedsCheckPrimitiveReturn() const {
  if (isWasmDebugFrame()) {
    return false;
  }
  return script()->isDerivedClassConstructor();
}

InterpreterActivation::InterpreterActivation(RunState& state, JSContext* cx,
                                             InterpreterFrame* entryFrame)
    : Activation(cx, Interpreter),
      entryFrame_(entryFrame),
      opMask_(0)
#ifdef DEBUG
      ,
      oldFrameCount_(cx->interpreterStack().frameCount_)
#endif
{
  regs_.prepareToRun(*entryFrame, state.script());
  MOZ_ASSERT(regs_.pc == state.script()->code());
}

InterpreterActivation::~InterpreterActivation() {
  // Pop all inline frames.
  while (regs_.fp() != entryFrame_) {
    popInlineFrame(regs_.fp());
  }

  MOZ_ASSERT(oldFrameCount_ == cx_->interpreterStack().frameCount_);
  MOZ_ASSERT_IF(oldFrameCount_ == 0,
                cx_->interpreterStack().allocator_.used() == 0);

  if (entryFrame_) {
    cx_->interpreterStack().releaseFrame(entryFrame_);
  }
}

inline bool InterpreterActivation::pushInlineFrame(
    const CallArgs& args, HandleScript script, MaybeConstruct constructing) {
  if (!cx_->interpreterStack().pushInlineFrame(cx_, regs_, args, script,
                                               constructing)) {
    return false;
  }
  MOZ_ASSERT(regs_.fp()->script()->compartment() == compartment());
  return true;
}

inline void InterpreterActivation::popInlineFrame(InterpreterFrame* frame) {
  (void)frame;  // Quell compiler warning.
  MOZ_ASSERT(regs_.fp() == frame);
  MOZ_ASSERT(regs_.fp() != entryFrame_);

  cx_->interpreterStack().popInlineFrame(regs_);
}

inline bool InterpreterActivation::resumeGeneratorFrame(HandleFunction callee,
                                                        HandleObject envChain) {
  InterpreterStack& stack = cx_->interpreterStack();
  if (!stack.resumeGeneratorCallFrame(cx_, regs_, callee, envChain)) {
    return false;
  }

  MOZ_ASSERT(regs_.fp()->script()->compartment() == compartment_);
  return true;
}

} /* namespace js */

#endif /* vm_Stack_inl_h */