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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 */
#ifndef jit_InterpreterEntryTrampoline_h
#define jit_InterpreterEntryTrampoline_h
#include "gc/Barrier.h"
#include "gc/Tracer.h"
#include "jit/JitCode.h"
#include "js/AllocPolicy.h"
#include "js/HashTable.h"
#include "js/RootingAPI.h"
namespace js {
void ClearInterpreterEntryMap(JSRuntime* runtime);
namespace jit {
* The EntryTrampolineMap is used to cache the trampoline code for
* each script as they are created. These trampolines are created
* only under --emit-interpreter-entry and are used to identify which
* script is being interpeted when profiling with external profilers
* such as perf.
* The map owns the JitCode objects that are created for each script,
* and keeps them alive at least as long as the script associated
* with it in case we need to re-enter the trampoline again.
* As each script is finalized, the entry is manually removed from
* the table in BaseScript::finalize which will also release the
* trampoline code associated with it.
* During a moving GC, the table is rekeyed in case any scripts
* have relocated.
class EntryTrampoline {
HeapPtr<JitCode*> entryTrampoline_;
void trace(JSTracer* trc) {
TraceNullableEdge(trc, &entryTrampoline_, "interpreter-entry-trampoline");
explicit EntryTrampoline(JSContext* cx, JitCode* code) {
entryTrampoline_ = code;
uint8_t* raw() {
MOZ_ASSERT(entryTrampoline_, "Empty trampoline code.");
return entryTrampoline_->raw();
void checkTrampolineAfterMovingGC();
using JSScriptToTrampolineMap =
HashMap<HeapPtr<BaseScript*>, EntryTrampoline,
DefaultHasher<HeapPtr<BaseScript*>>, SystemAllocPolicy>;
class EntryTrampolineMap : public JSScriptToTrampolineMap {
void traceTrampolineCode(JSTracer* trc);
void updateScriptsAfterMovingGC(void);
void checkScriptsAfterMovingGC();
} // namespace jit
} // namespace js
#endif /* jit_InterpreterEntryTrampoline_h */