File: jspubtd.h

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/* -*- 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/. */

#ifndef jspubtd_h
#define jspubtd_h

/*
 * JS public API typedefs.
 */

#include "mozilla/Assertions.h"
#include "mozilla/EnumeratedArray.h"
#include "mozilla/LinkedList.h"
#include "mozilla/PodOperations.h"

#include "jstypes.h"

#include "js/ProtoKey.h"
#include "js/Result.h"
#include "js/TraceKind.h"
#include "js/TypeDecls.h"

#if defined(JS_GC_ZEAL) || defined(DEBUG)
#define JSGC_HASH_TABLE_CHECKS
#endif

namespace JS {

template <typename T>
class AutoVector;
using AutoIdVector = AutoVector<jsid>;
using AutoValueVector = AutoVector<Value>;
using AutoObjectVector = AutoVector<JSObject*>;

class CallArgs;

class JS_FRIEND_API CompileOptions;
class JS_FRIEND_API ReadOnlyCompileOptions;
class JS_FRIEND_API OwningCompileOptions;
class JS_FRIEND_API TransitiveCompileOptions;
class JS_PUBLIC_API CompartmentOptions;

}  // namespace JS

/* Result of typeof operator enumeration. */
enum JSType {
  JSTYPE_UNDEFINED, /* undefined */
  JSTYPE_OBJECT,    /* object */
  JSTYPE_FUNCTION,  /* function */
  JSTYPE_STRING,    /* string */
  JSTYPE_NUMBER,    /* number */
  JSTYPE_BOOLEAN,   /* boolean */
  JSTYPE_NULL,      /* null */
  JSTYPE_SYMBOL,    /* symbol */
  JSTYPE_LIMIT
};

/* Dense index into cached prototypes and class atoms for standard objects. */
enum JSProtoKey {
#define PROTOKEY_AND_INITIALIZER(name, init, clasp) JSProto_##name,
  JS_FOR_EACH_PROTOTYPE(PROTOKEY_AND_INITIALIZER)
#undef PROTOKEY_AND_INITIALIZER
      JSProto_LIMIT
};

/* Struct forward declarations. */
struct JSClass;
class JSErrorReport;
struct JSExceptionState;
struct JSFunctionSpec;
struct JSLocaleCallbacks;
struct JSPrincipals;
struct JSPropertySpec;
struct JSSecurityCallbacks;
struct JSStructuredCloneCallbacks;
struct JSStructuredCloneReader;
struct JSStructuredCloneWriter;
class JS_PUBLIC_API JSTracer;

class JSFlatString;

typedef bool (*JSInitCallback)(void);

template <typename T>
struct JSConstScalarSpec;
typedef JSConstScalarSpec<double> JSConstDoubleSpec;
typedef JSConstScalarSpec<int32_t> JSConstIntegerSpec;

namespace js {
namespace gc {
class AutoTraceSession;
class StoreBuffer;
}  // namespace gc

class CooperatingContext;

inline JSCompartment* GetContextCompartment(const JSContext* cx);
inline JS::Zone* GetContextZone(const JSContext* cx);

// Whether the current thread is permitted access to any part of the specified
// runtime or zone.
JS_FRIEND_API bool CurrentThreadCanAccessRuntime(const JSRuntime* rt);

#ifdef DEBUG
JS_FRIEND_API bool CurrentThreadIsPerformingGC();
#endif

}  // namespace js

namespace JS {

class JS_PUBLIC_API AutoEnterCycleCollection;
class JS_PUBLIC_API AutoAssertOnBarrier;
struct JS_PUBLIC_API PropertyDescriptor;

typedef void (*OffThreadCompileCallback)(void* token, void* callbackData);

enum class HeapState {
  Idle,             // doing nothing with the GC heap
  Tracing,          // tracing the GC heap without collecting, e.g.
                    // IterateCompartments()
  MajorCollecting,  // doing a GC of the major heap
  MinorCollecting,  // doing a GC of the minor heap (nursery)
  CycleCollecting   // in the "Unlink" phase of cycle collection
};

JS_PUBLIC_API HeapState CurrentThreadHeapState();

static inline bool CurrentThreadIsHeapBusy() {
  return CurrentThreadHeapState() != HeapState::Idle;
}

static inline bool CurrentThreadIsHeapTracing() {
  return CurrentThreadHeapState() == HeapState::Tracing;
}

static inline bool CurrentThreadIsHeapMajorCollecting() {
  return CurrentThreadHeapState() == HeapState::MajorCollecting;
}

static inline bool CurrentThreadIsHeapMinorCollecting() {
  return CurrentThreadHeapState() == HeapState::MinorCollecting;
}

static inline bool CurrentThreadIsHeapCollecting() {
  HeapState state = CurrentThreadHeapState();
  return state == HeapState::MajorCollecting ||
         state == HeapState::MinorCollecting;
}

static inline bool CurrentThreadIsHeapCycleCollecting() {
  return CurrentThreadHeapState() == HeapState::CycleCollecting;
}

// Decorates the Unlinking phase of CycleCollection so that accidental use
// of barriered accessors results in assertions instead of leaks.
class MOZ_STACK_CLASS JS_PUBLIC_API AutoEnterCycleCollection {
#ifdef DEBUG
 public:
  explicit AutoEnterCycleCollection(JSRuntime* rt);
  ~AutoEnterCycleCollection();
#else
 public:
  explicit AutoEnterCycleCollection(JSRuntime* rt) {}
  ~AutoEnterCycleCollection() {}
#endif
};

} /* namespace JS */

MOZ_BEGIN_EXTERN_C

// Defined in NSPR prio.h.
typedef struct PRFileDesc PRFileDesc;

MOZ_END_EXTERN_C

#endif /* jspubtd_h */