jscntxt.h

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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 *
 * ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is Mozilla Communicator client code, released
 * March 31, 1998.
 *
 * The Initial Developer of the Original Code is
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 1998
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either of the GNU General Public License Version 2 or later (the "GPL"),
 * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

#ifndef jscntxt_h___
#define jscntxt_h___
/*
 * JS execution context.
 */
#include "jsarena.h" /* Added by JSIFY */
#include "jsclist.h"
#include "jslong.h"
#include "jsatom.h"
#include "jsconfig.h"
#include "jsdhash.h"
#include "jsgc.h"
#include "jsinterp.h"
#include "jsobj.h"
#include "jsprvtd.h"
#include "jspubtd.h"
#include "jsregexp.h"

JS_BEGIN_EXTERN_C

typedef enum JSGCMode { JS_NO_GC, JS_MAYBE_GC, JS_FORCE_GC } JSGCMode;

typedef enum JSRuntimeState {
    JSRTS_DOWN,
    JSRTS_LAUNCHING,
    JSRTS_UP,
    JSRTS_LANDING
} JSRuntimeState;

typedef struct JSPropertyTreeEntry {
    JSDHashEntryHdr     hdr;
    JSScopeProperty     *child;
} JSPropertyTreeEntry;

struct JSRuntime {
    /* Runtime state, synchronized by the stateChange/gcLock condvar/lock. */
    JSRuntimeState      state;

    /* Garbage collector state, used by jsgc.c. */
    JSArenaPool         gcArenaPool;
    JSDHashTable        gcRootsHash;
    JSDHashTable        *gcLocksHash;
    JSGCThing           *gcFreeList;
    jsrefcount          gcKeepAtoms;
    uint32              gcBytes;
    uint32              gcLastBytes;
    uint32              gcMaxBytes;
    uint32              gcLevel;
    uint32              gcNumber;
    JSPackedBool        gcPoke;
    JSPackedBool        gcRunning;
    JSGCCallback        gcCallback;
    uint32              gcMallocBytes;
#ifdef JS_GCMETER
    JSGCStats           gcStats;
#endif

    /* Literal table maintained by jsatom.c functions. */
    JSAtomState         atomState;

    /* Random number generator state, used by jsmath.c. */
    JSBool              rngInitialized;
    int64               rngMultiplier;
    int64               rngAddend;
    int64               rngMask;
    int64               rngSeed;
    jsdouble            rngDscale;

    /* Well-known numbers held for use by this runtime's contexts. */
    jsdouble            *jsNaN;
    jsdouble            *jsNegativeInfinity;
    jsdouble            *jsPositiveInfinity;

    /* Empty string held for use by this runtime's contexts. */
    JSString            *emptyString;

    /* List of active contexts sharing this runtime; protected by gcLock. */
    JSCList             contextList;

    /* These are used for debugging -- see jsprvtd.h and jsdbgapi.h. */
    JSTrapHandler       interruptHandler;
    void                *interruptHandlerData;
    JSNewScriptHook     newScriptHook;
    void                *newScriptHookData;
    JSDestroyScriptHook destroyScriptHook;
    void                *destroyScriptHookData;
    JSTrapHandler       debuggerHandler;
    void                *debuggerHandlerData;
    JSSourceHandler     sourceHandler;
    void                *sourceHandlerData;
    JSInterpreterHook   executeHook;
    void                *executeHookData;
    JSInterpreterHook   callHook;
    void                *callHookData;
    JSObjectHook        objectHook;
    void                *objectHookData;
    JSTrapHandler       throwHook;
    void                *throwHookData;
    JSDebugErrorHook    debugErrorHook;
    void                *debugErrorHookData;

    /* More debugging state, see jsdbgapi.c. */
    JSCList             trapList;
    JSCList             watchPointList;

    /* Weak links to properties, indexed by quickened get/set opcodes. */
    /* XXX must come after JSCLists or MSVC alignment bug bites empty lists */
    JSPropertyCache     propertyCache;

    /* Client opaque pointer */
    void                *data;

#ifdef JS_THREADSAFE
    /* These combine to interlock the GC and new requests. */
    PRLock              *gcLock;
    PRCondVar           *gcDone;
    PRCondVar           *requestDone;
    uint32              requestCount;
    jsword              gcThread;

    /* Lock and owning thread pointer for JS_LOCK_RUNTIME. */
    PRLock              *rtLock;
#ifdef DEBUG
    jsword              rtLockOwner;
#endif

    /* Used to synchronize down/up state change; protected by gcLock. */
    PRCondVar           *stateChange;

    /* Used to serialize cycle checks when setting __proto__ or __parent__. */
    PRLock              *setSlotLock;
    PRCondVar           *setSlotDone;
    JSBool              setSlotBusy;
    JSScope             *setSlotScope;  /* deadlock avoidance, see jslock.c */

    /*
     * State for sharing single-threaded scopes, once a second thread tries to
     * lock a scope.  The scopeSharingDone condvar is protected by rt->gcLock,
     * to minimize number of locks taken in JS_EndRequest.
     *
     * The scopeSharingTodo linked list is likewise "global" per runtime, not
     * one-list-per-context, to conserve space over all contexts, optimizing
     * for the likely case that scopes become shared rarely, and among a very
     * small set of threads (contexts).
     */
    PRCondVar           *scopeSharingDone;
    JSScope             *scopeSharingTodo;

/*
 * Magic terminator for the rt->scopeSharingTodo linked list, threaded through
 * scope->u.link.  This hack allows us to test whether a scope is on the list
 * by asking whether scope->u.link is non-null.  We use a large, likely bogus
 * pointer here to distinguish this value from any valid u.count (small int)
 * value.
 */
#define NO_SCOPE_SHARING_TODO   ((JSScope *) 0xfeedbeef)
#endif /* JS_THREADSAFE */

    /*
     * Check property accessibility for objects of arbitrary class.  Used at
     * present to check f.caller accessibility for any function object f.
     */
    JSCheckAccessOp     checkObjectAccess;

    /* Security principals serialization support. */
    JSPrincipalsTranscoder principalsTranscoder;

    /* Shared scope property tree, and allocator for its nodes. */
    JSDHashTable        propertyTreeHash;
    JSScopeProperty     *propertyFreeList;
    JSArenaPool         propertyArenaPool;

#ifdef DEBUG
    /* Function invocation metering. */
    jsrefcount          inlineCalls;
    jsrefcount          nativeCalls;
    jsrefcount          nonInlineCalls;
    jsrefcount          constructs;

    /* Scope lock and property metering. */
    jsrefcount          claimAttempts;
    jsrefcount          claimedScopes;
    jsrefcount          deadContexts;
    jsrefcount          deadlocksAvoided;
    jsrefcount          liveScopes;
    jsrefcount          sharedScopes;
    jsrefcount          totalScopes;
    jsrefcount          badUndependStrings;
    jsrefcount          liveScopeProps;
    jsrefcount          totalScopeProps;
    jsrefcount          livePropTreeNodes;
    jsrefcount          duplicatePropTreeNodes;
    jsrefcount          totalPropTreeNodes;
    jsrefcount          propTreeKidsChunks;
    jsrefcount          middleDeleteFixups;

    /* String instrumentation. */
    jsrefcount          liveStrings;
    jsrefcount          totalStrings;
    jsrefcount          liveDependentStrings;
    jsrefcount          totalDependentStrings;
    double              lengthSum;
    double              lengthSquaredSum;
    double              strdepLengthSum;
    double              strdepLengthSquaredSum;
#endif
};

#ifdef DEBUG
# define JS_RUNTIME_METER(rt, which)    JS_ATOMIC_INCREMENT(&(rt)->which)