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/* -*- 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 */
#include "vm/Activation-inl.h"
#include "mozilla/Assertions.h" // MOZ_ASSERT
#include <stddef.h> // size_t
#include <stdint.h> // uint8_t, uint32_t
#include "debugger/DebugAPI.h" // js::DebugAPI
#include "gc/GC.h" // js::gc::AutoSuppressGC
#include "jit/CalleeToken.h" // js::jit::CalleeToken{IsFunction,To{Function,Script}}
#include "js/RootingAPI.h" // JS::Rooted
#include "js/Value.h" // JS::Value
#include "vm/JSContext.h" // JSContext, js::TlsContext
#include "vm/Stack.h" // js::InterpreterFrame
#include "vm/Compartment-inl.h" // JS::Compartment::wrap
using namespace js;
using JS::ObjectOrNullValue;
using JS::Rooted;
using JS::UndefinedValue;
using JS::Value;
Value ActivationEntryMonitor::asyncStack(JSContext* cx) {
Rooted<Value> stack(cx, ObjectOrNullValue(cx->asyncStackForNewActivations()));
if (!cx->compartment()->wrap(cx, &stack)) {
return UndefinedValue();
return stack;
void ActivationEntryMonitor::init(JSContext* cx, InterpreterFrame* entryFrame) {
// The InterpreterFrame is not yet part of an Activation, so it won't
// be traced if we trigger GC here. Suppress GC to avoid this.
gc::AutoSuppressGC suppressGC(cx);
Rooted<Value> stack(cx, asyncStack(cx));
const char* asyncCause = cx->asyncCauseForNewActivations;
if (entryFrame->isFunctionFrame()) {
entryMonitor_->Entry(cx, &entryFrame->callee(), stack, asyncCause);
} else {
entryMonitor_->Entry(cx, entryFrame->script(), stack, asyncCause);
void ActivationEntryMonitor::init(JSContext* cx, jit::CalleeToken entryToken) {
// The CalleeToken is not traced at this point and we also don't want
// a GC to discard the code we're about to enter, so we suppress GC.
gc::AutoSuppressGC suppressGC(cx);
RootedValue stack(cx, asyncStack(cx));
const char* asyncCause = cx->asyncCauseForNewActivations;
if (jit::CalleeTokenIsFunction(entryToken)) {
entryMonitor_->Entry(cx_, jit::CalleeTokenToFunction(entryToken), stack,
} else {
entryMonitor_->Entry(cx_, jit::CalleeTokenToScript(entryToken), stack,
void Activation::registerProfiling() {
cx_->profilingActivation_ = this;
void Activation::unregisterProfiling() {
MOZ_ASSERT(cx_->profilingActivation_ == this);
cx_->profilingActivation_ = prevProfiling_;
ActivationIterator::ActivationIterator(JSContext* cx)
: activation_(cx->activation_) {
MOZ_ASSERT(cx == TlsContext.get());
ActivationIterator& ActivationIterator::operator++() {
activation_ = activation_->prev();
return *this;