/* -*- 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 jsgc_h___ #define jsgc_h___ /* * JS Garbage Collector. */ #include "jsprvtd.h" #include "jspubtd.h" #include "jsdhash.h" JS_BEGIN_EXTERN_C /* GC thing type indexes. */ #define GCX_OBJECT 0 /* JSObject */ #define GCX_STRING 1 /* JSString */ #define GCX_DOUBLE 2 /* jsdouble */ #define GCX_MUTABLE_STRING 3 /* JSString that's mutable -- single-threaded only! */ #define GCX_PRIVATE 4 /* private (unscanned) data */ #define GCX_NAMESPACE 5 /* JSXMLNamespace */ #define GCX_QNAME 6 /* JSXMLQName */ #define GCX_XML 7 /* JSXML */ #define GCX_EXTERNAL_STRING 8 /* JSString w/ external chars */ #define GCX_NTYPES_LOG2 4 /* type index bits */ #define GCX_NTYPES JS_BIT(GCX_NTYPES_LOG2) /* GC flag definitions, must fit in 8 bits (type index goes in the low bits). */ #define GCF_TYPEMASK JS_BITMASK(GCX_NTYPES_LOG2) #define GCF_MARK JS_BIT(GCX_NTYPES_LOG2) #define GCF_FINAL JS_BIT(GCX_NTYPES_LOG2 + 1) #define GCF_SYSTEM JS_BIT(GCX_NTYPES_LOG2 + 2) #define GCF_LOCKSHIFT (GCX_NTYPES_LOG2 + 3) /* lock bit shift */ #define GCF_LOCK JS_BIT(GCF_LOCKSHIFT) /* lock request bit in API */ /* Pseudo-flag that modifies GCX_STRING to make GCX_MUTABLE_STRING. */ #define GCF_MUTABLE 2 #if (GCX_STRING | GCF_MUTABLE) != GCX_MUTABLE_STRING # error "mutable string type index botch!" #endif extern uint8 * js_GetGCThingFlags(void *thing); /* These are compatible with JSDHashEntryStub. */ struct JSGCRootHashEntry { JSDHashEntryHdr hdr; void *root; const char *name; }; struct JSGCLockHashEntry { JSDHashEntryHdr hdr; const JSGCThing *thing; uint32 count; }; #if 1 /* * Since we're forcing a GC from JS_GC anyway, don't bother wasting cycles * loading oldval. XXX remove implied force, fix jsinterp.c's "second arg * ignored", etc. */ #define GC_POKE(cx, oldval) ((cx)->runtime->gcPoke = JS_TRUE) #else #define GC_POKE(cx, oldval) ((cx)->runtime->gcPoke = JSVAL_IS_GCTHING(oldval)) #endif extern intN js_ChangeExternalStringFinalizer(JSStringFinalizeOp oldop, JSStringFinalizeOp newop); extern JSBool js_InitGC(JSRuntime *rt, uint32 maxbytes); extern void js_FinishGC(JSRuntime *rt); extern JSBool js_AddRoot(JSContext *cx, void *rp, const char *name); extern JSBool js_AddRootRT(JSRuntime *rt, void *rp, const char *name); extern JSBool js_RemoveRoot(JSRuntime *rt, void *rp); /* * The private JSGCThing struct, which describes a gcFreeList element. */ struct JSGCThing { JSGCThing *next; uint8 *flagp; }; #define GC_NBYTES_MAX (10 * sizeof(JSGCThing)) #define GC_NUM_FREELISTS (GC_NBYTES_MAX / sizeof(JSGCThing)) #define GC_FREELIST_NBYTES(i) (((i) + 1) * sizeof(JSGCThing)) #define GC_FREELIST_INDEX(n) (((n) / sizeof(JSGCThing)) - 1) extern void * js_NewGCThing(JSContext *cx, uintN flags, size_t nbytes); extern JSBool js_LockGCThing(JSContext *cx, void *thing); extern JSBool js_LockGCThingRT(JSRuntime *rt, void *thing); extern JSBool js_UnlockGCThingRT(JSRuntime *rt, void *thing); extern JSBool js_IsAboutToBeFinalized(JSContext *cx, void *thing); extern void js_MarkAtom(JSContext *cx, JSAtom *atom, void *arg); /* We avoid a large number of unnecessary calls by doing the flag check first */ #define GC_MARK_ATOM(cx, atom, arg) \ JS_BEGIN_MACRO \ if (!((atom)->flags & ATOM_MARK)) \ js_MarkAtom(cx, atom, arg); \ JS_END_MACRO extern void js_MarkGCThing(JSContext *cx, void *thing, void *arg); #ifdef GC_MARK_DEBUG typedef struct GCMarkNode GCMarkNode; struct GCMarkNode { void *thing; const char *name; GCMarkNode *next; GCMarkNode *prev; }; #define GC_MARK(cx_, thing_, name_, prev_) \ JS_BEGIN_MACRO \ GCMarkNode node_; \ node_.thing = thing_; \ node_.name = name_; \ node_.next = NULL; \ node_.prev = prev_; \ if (prev_) ((GCMarkNode *)(prev_))->next = &node_; \ js_MarkGCThing(cx_, thing_, &node_); \ JS_END_MACRO #else /* !GC_MARK_DEBUG */ #define GC_MARK(cx, thing, name, prev) js_MarkGCThing(cx, thing, NULL) #endif /* !GC_MARK_DEBUG */ /* * Flags to modify how a GC marks and sweeps: * GC_KEEP_ATOMS Don't sweep unmarked atoms, they may be in use by the * compiler, or by an API function that calls js_Atomize, * when the GC is called from js_NewGCThing, due to a * malloc failure or the runtime GC-thing limit. * GC_LAST_CONTEXT Called from js_DestroyContext for last JSContext in a * JSRuntime, when it is imperative that rt->gcPoke gets * cleared early in js_GC, if it is set. * GC_ALREADY_LOCKED rt->gcLock is already held on entry to js_GC, and kept * on return to its caller. */ #define GC_KEEP_ATOMS 0x1 #define GC_LAST_CONTEXT 0x2 #define GC_ALREADY_LOCKED 0x4 extern void js_ForceGC(JSContext *cx, uintN gcflags); extern void js_GC(JSContext *cx, uintN gcflags); #ifdef DEBUG_notme #define JS_GCMETER 1 #endif #ifdef JS_GCMETER typedef struct JSGCStats { uint32 alloc; /* number of allocation attempts */ uint32 freelen[GC_NUM_FREELISTS]; /* gcFreeList lengths */ uint32 recycle[GC_NUM_FREELISTS]; /* number of things recycled through gcFreeList */ uint32 retry; /* allocation attempt retries after running the GC */ uint32 retryhalt; /* allocation retries halted by the branch callback */ uint32 fail; /* allocation failures */ uint32 finalfail; /* finalizer calls allocator failures */ uint32 lockborn; /* things born locked */ uint32 lock; /* valid lock calls */ uint32 unlock; /* valid unlock calls */ uint32 depth; /* mark tail recursion depth */ uint32 maxdepth; /* maximum mark tail recursion depth */ uint32 cdepth; /* mark recursion depth of C functions */ uint32 maxcdepth; /* maximum mark recursion depth of C functions */ uint32 dswmark; /* mark C stack overflows => Deutsch-Schorr-Waite */ uint32 dswdepth; /* DSW mark depth */ uint32 maxdswdepth;/* maximum DSW mark depth */ uint32 dswup; /* DSW moves up the mark spanning tree */ uint32 dswupstep; /* steps in obj->slots to find DSW-reversed pointer */ uint32 maxlevel; /* maximum GC nesting (indirect recursion) level */ uint32 poke; /* number of potentially useful GC calls */ uint32 nopoke; /* useless GC calls where js_PokeGC was not set */ uint32 afree; /* thing arenas freed so far */ uint32 stackseg; /* total extraordinary stack segments scanned */ uint32 segslots; /* total stack segment jsval slots scanned */ } JSGCStats; extern JS_FRIEND_API(void) js_DumpGCStats(JSRuntime *rt, FILE *fp); #endif /* JS_GCMETER */ #ifdef DEBUG_notme #define TOO_MUCH_GC 1 #endif #ifdef WAY_TOO_MUCH_GC #define TOO_MUCH_GC 1 #endif JS_END_EXTERN_C #endif /* jsgc_h___ */