mirror of
https://gitlab.winehq.org/wine/wine-gecko.git
synced 2024-09-13 09:24:08 -07:00
1540 lines
51 KiB
C++
1540 lines
51 KiB
C++
/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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* vim: set ts=8 sw=4 et tw=78:
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*
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* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Mozilla Communicator client code, released
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* March 31, 1998.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifndef jscntxt_h___
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#define jscntxt_h___
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/*
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* JS execution context.
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*/
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#include "jsarena.h" /* Added by JSIFY */
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#include "jsclist.h"
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#include "jslong.h"
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#include "jsatom.h"
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#include "jsversion.h"
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#include "jsdhash.h"
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#include "jsgc.h"
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#include "jsinterp.h"
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#include "jsobj.h"
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#include "jsprvtd.h"
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#include "jspubtd.h"
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#include "jsregexp.h"
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#include "jsutil.h"
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JS_BEGIN_EXTERN_C
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/*
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* js_GetSrcNote cache to avoid O(n^2) growth in finding a source note for a
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* given pc in a script. We use the script->code pointer to tag the cache,
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* instead of the script address itself, so that source notes are always found
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* by offset from the bytecode with which they were generated.
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*/
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typedef struct JSGSNCache {
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jsbytecode *code;
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JSDHashTable table;
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#ifdef JS_GSNMETER
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uint32 hits;
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uint32 misses;
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uint32 fills;
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uint32 purges;
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# define GSN_CACHE_METER(cache,cnt) (++(cache)->cnt)
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#else
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# define GSN_CACHE_METER(cache,cnt) /* nothing */
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#endif
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} JSGSNCache;
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#define js_FinishGSNCache(cache) js_PurgeGSNCache(cache)
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extern void
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js_PurgeGSNCache(JSGSNCache *cache);
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/* These helper macros take a cx as parameter and operate on its GSN cache. */
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#define JS_PURGE_GSN_CACHE(cx) js_PurgeGSNCache(&JS_GSN_CACHE(cx))
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#define JS_METER_GSN_CACHE(cx,cnt) GSN_CACHE_METER(&JS_GSN_CACHE(cx), cnt)
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typedef struct InterpState InterpState;
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typedef struct VMSideExit VMSideExit;
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#ifdef __cplusplus
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namespace nanojit {
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class Fragment;
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class Fragmento;
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class LirBuffer;
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}
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class TraceRecorder;
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extern "C++" { template<typename T> class Queue; }
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typedef Queue<uint16> SlotList;
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# define CLS(T) T*
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#else
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# define CLS(T) void*
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#endif
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#define FRAGMENT_TABLE_SIZE 512
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struct VMFragment;
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#define MONITOR_N_GLOBAL_STATES 4
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struct GlobalState {
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JSObject* globalObj;
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uint32 globalShape;
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CLS(SlotList) globalSlots;
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};
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/*
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* Trace monitor. Every JSThread (if JS_THREADSAFE) or JSRuntime (if not
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* JS_THREADSAFE) has an associated trace monitor that keeps track of loop
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* frequencies for all JavaScript code loaded into that runtime.
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*/
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struct JSTraceMonitor {
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/*
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* The context currently executing JIT-compiled code on this thread, or
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* NULL if none. Among other things, this can in certain cases prevent
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* last-ditch GC and suppress calls to JS_ReportOutOfMemory.
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*
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* !tracecx && !recorder: not on trace
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* !tracecx && !recorder && prohibitFlush: deep-bailed
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* !tracecx && recorder && !recorder->deepAborted: recording
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* !tracecx && recorder && recorder->deepAborted: deep aborted
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* tracecx && !recorder: executing a trace
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* tracecx && recorder: executing inner loop, recording outer loop
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*/
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JSContext *tracecx;
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CLS(nanojit::LirBuffer) lirbuf;
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CLS(nanojit::Fragmento) fragmento;
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CLS(TraceRecorder) recorder;
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jsval *reservedDoublePool;
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jsval *reservedDoublePoolPtr;
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struct GlobalState globalStates[MONITOR_N_GLOBAL_STATES];
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struct VMFragment* vmfragments[FRAGMENT_TABLE_SIZE];
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JSDHashTable recordAttempts;
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/*
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* Maximum size of the code cache before we start flushing. 1/16 of this
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* size is used as threshold for the regular expression code cache.
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*/
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uint32 maxCodeCacheBytes;
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/*
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* If nonzero, do not flush the JIT cache after a deep bail. That would
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* free JITted code pages that we will later return to. Instead, set the
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* needFlush flag so that it can be flushed later.
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*
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* NB: needFlush and useReservedObjects are packed together.
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*/
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uintN prohibitFlush;
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JSPackedBool needFlush;
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/*
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* reservedObjects is a linked list (via fslots[0]) of preallocated JSObjects.
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* The JIT uses this to ensure that leaving a trace tree can't fail.
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*/
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JSPackedBool useReservedObjects;
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JSObject *reservedObjects;
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/* Fragmento for the regular expression compiler. This is logically
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* a distinct compiler but needs to be managed in exactly the same
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* way as the real tracing Fragmento. */
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CLS(nanojit::LirBuffer) reLirBuf;
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CLS(nanojit::Fragmento) reFragmento;
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/* Keep a list of recorders we need to abort on cache flush. */
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CLS(TraceRecorder) abortStack;
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};
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typedef struct InterpStruct InterpStruct;
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/*
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* N.B. JS_ON_TRACE(cx) is true if JIT code is on the stack in the current
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* thread, regardless of whether cx is the context in which that trace is
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* executing. cx must be a context on the current thread.
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*/
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#ifdef JS_TRACER
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# define JS_ON_TRACE(cx) (JS_TRACE_MONITOR(cx).tracecx != NULL)
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#else
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# define JS_ON_TRACE(cx) JS_FALSE
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#endif
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#ifdef DEBUG
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# define JS_EVAL_CACHE_METERING 1
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# define JS_FUNCTION_METERING 1
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#endif
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/* Number of potentially reusable scriptsToGC to search for the eval cache. */
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#ifndef JS_EVAL_CACHE_SHIFT
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# define JS_EVAL_CACHE_SHIFT 6
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#endif
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#define JS_EVAL_CACHE_SIZE JS_BIT(JS_EVAL_CACHE_SHIFT)
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#ifdef JS_EVAL_CACHE_METERING
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# define EVAL_CACHE_METER_LIST(_) _(probe), _(hit), _(step), _(noscope)
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# define identity(x) x
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/* Have to typedef this for LiveConnect C code, which includes us. */
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typedef struct JSEvalCacheMeter {
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uint64 EVAL_CACHE_METER_LIST(identity);
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} JSEvalCacheMeter;
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# undef identity
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#endif
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#ifdef JS_FUNCTION_METERING
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# define FUNCTION_KIND_METER_LIST(_) \
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_(allfun), _(heavy), _(nofreeupvar), _(onlyfreevar), \
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_(display), _(flat), _(setupvar), _(badfunarg)
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# define identity(x) x
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typedef struct JSFunctionMeter {
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int32 FUNCTION_KIND_METER_LIST(identity);
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} JSFunctionMeter;
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# undef identity
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#endif
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struct JSThreadData {
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/*
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* The GSN cache is per thread since even multi-cx-per-thread embeddings
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* do not interleave js_GetSrcNote calls.
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*/
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JSGSNCache gsnCache;
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/* Property cache for faster call/get/set invocation. */
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JSPropertyCache propertyCache;
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#ifdef JS_TRACER
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/* Trace-tree JIT recorder/interpreter state. */
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JSTraceMonitor traceMonitor;
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#endif
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/* Lock-free hashed lists of scripts created by eval to garbage-collect. */
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JSScript *scriptsToGC[JS_EVAL_CACHE_SIZE];
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#ifdef JS_EVAL_CACHE_METERING
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JSEvalCacheMeter evalCacheMeter;
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#endif
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};
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#ifdef JS_THREADSAFE
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/*
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* Structure uniquely representing a thread. It holds thread-private data
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* that can be accessed without a global lock.
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*/
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struct JSThread {
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/* Linked list of all contexts in use on this thread. */
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JSCList contextList;
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/* Opaque thread-id, from NSPR's PR_GetCurrentThread(). */
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jsword id;
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/*
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* Thread-local version of JSRuntime.gcMallocBytes to avoid taking
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* locks on each JS_malloc.
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*/
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uint32 gcMallocBytes;
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/* Indicates that the thread is waiting in ClaimTitle from jslock.cpp. */
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JSTitle *titleToShare;
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/* Factored out of JSThread for !JS_THREADSAFE embedding in JSRuntime. */
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JSThreadData data;
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};
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#define JS_THREAD_DATA(cx) (&(cx)->thread->data)
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struct JSThreadsHashEntry {
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JSDHashEntryHdr base;
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JSThread *thread;
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};
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/*
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* The function takes the GC lock and does not release in successful return.
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* On error (out of memory) the function releases the lock but delegates
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* the error reporting to the caller.
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*/
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extern JSBool
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js_InitContextThread(JSContext *cx);
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/*
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* On entrance the GC lock must be held and it will be held on exit.
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*/
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extern void
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js_ClearContextThread(JSContext *cx);
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#endif /* JS_THREADSAFE */
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typedef enum JSDestroyContextMode {
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JSDCM_NO_GC,
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JSDCM_MAYBE_GC,
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JSDCM_FORCE_GC,
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JSDCM_NEW_FAILED
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} JSDestroyContextMode;
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typedef enum JSRuntimeState {
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JSRTS_DOWN,
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JSRTS_LAUNCHING,
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JSRTS_UP,
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JSRTS_LANDING
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} JSRuntimeState;
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typedef enum JSBuiltinFunctionId {
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JSBUILTIN_ObjectToIterator,
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JSBUILTIN_CallIteratorNext,
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JSBUILTIN_GetProperty,
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JSBUILTIN_GetElement,
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JSBUILTIN_SetProperty,
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JSBUILTIN_SetElement,
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JSBUILTIN_LIMIT
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} JSBuiltinFunctionId;
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typedef struct JSPropertyTreeEntry {
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JSDHashEntryHdr hdr;
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JSScopeProperty *child;
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} JSPropertyTreeEntry;
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typedef struct JSSetSlotRequest JSSetSlotRequest;
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struct JSSetSlotRequest {
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JSObject *obj; /* object containing slot to set */
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JSObject *pobj; /* new proto or parent reference */
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uint16 slot; /* which to set, proto or parent */
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JSPackedBool cycle; /* true if a cycle was detected */
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JSSetSlotRequest *next; /* next request in GC worklist */
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};
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struct JSRuntime {
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/* Runtime state, synchronized by the stateChange/gcLock condvar/lock. */
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JSRuntimeState state;
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/* Context create/destroy callback. */
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JSContextCallback cxCallback;
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/*
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* Shape regenerated whenever a prototype implicated by an "add property"
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* property cache fill and induced trace guard has a readonly property or a
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* setter defined on it. This number proxies for the shapes of all objects
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* along the prototype chain of all objects in the runtime on which such an
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* add-property result has been cached/traced.
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*
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* See bug 492355 for more details.
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*
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* This comes early in JSRuntime to minimize the immediate format used by
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* trace-JITted code that reads it.
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*/
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uint32 protoHazardShape;
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/* Garbage collector state, used by jsgc.c. */
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JSGCChunkInfo *gcChunkList;
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JSGCArenaList gcArenaList[GC_NUM_FREELISTS];
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JSGCDoubleArenaList gcDoubleArenaList;
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JSGCFreeListSet *gcFreeListsPool;
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JSDHashTable gcRootsHash;
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JSDHashTable *gcLocksHash;
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jsrefcount gcKeepAtoms;
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uint32 gcBytes;
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uint32 gcLastBytes;
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uint32 gcMaxBytes;
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uint32 gcMaxMallocBytes;
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uint32 gcEmptyArenaPoolLifespan;
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uint32 gcLevel;
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uint32 gcNumber;
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JSTracer *gcMarkingTracer;
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uint32 gcTriggerFactor;
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volatile JSBool gcIsNeeded;
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/*
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* NB: do not pack another flag here by claiming gcPadding unless the new
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* flag is written only by the GC thread. Atomic updates to packed bytes
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* are not guaranteed, so stores issued by one thread may be lost due to
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* unsynchronized read-modify-write cycles on other threads.
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*/
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JSPackedBool gcPoke;
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JSPackedBool gcRunning;
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uint16 gcPadding;
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#ifdef JS_GC_ZEAL
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jsrefcount gcZeal;
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#endif
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JSGCCallback gcCallback;
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uint32 gcMallocBytes;
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JSGCArenaInfo *gcUntracedArenaStackTop;
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#ifdef DEBUG
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size_t gcTraceLaterCount;
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#endif
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/*
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* Table for tracking iterators to ensure that we close iterator's state
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* before finalizing the iterable object.
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*/
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JSPtrTable gcIteratorTable;
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/*
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* The trace operation and its data argument to trace embedding-specific
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* GC roots.
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*/
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JSTraceDataOp gcExtraRootsTraceOp;
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void *gcExtraRootsData;
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/*
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* Used to serialize cycle checks when setting __proto__ or __parent__ by
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* requesting the GC handle the required cycle detection. If the GC hasn't
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* been poked, it won't scan for garbage. This member is protected by
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* rt->gcLock.
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*/
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JSSetSlotRequest *setSlotRequests;
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|
/* Random number generator state, used by jsmath.c. */
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|
JSBool rngInitialized;
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int64 rngMultiplier;
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int64 rngAddend;
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int64 rngMask;
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|
int64 rngSeed;
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|
jsdouble rngDscale;
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|
/* Well-known numbers held for use by this runtime's contexts. */
|
|
jsdouble *jsNaN;
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|
jsdouble *jsNegativeInfinity;
|
|
jsdouble *jsPositiveInfinity;
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#ifdef JS_THREADSAFE
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|
JSLock *deflatedStringCacheLock;
|
|
#endif
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|
JSHashTable *deflatedStringCache;
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|
#ifdef DEBUG
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|
uint32 deflatedStringCacheBytes;
|
|
#endif
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|
|
/*
|
|
* Empty and unit-length strings held for use by this runtime's contexts.
|
|
* The unitStrings array and its elements are created on demand.
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|
*/
|
|
JSString *emptyString;
|
|
JSString **unitStrings;
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|
|
/*
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|
* Builtin functions, lazily created and held for use by the trace recorder.
|
|
*
|
|
* This field would be #ifdef JS_TRACER, but XPConnect is compiled without
|
|
* -DJS_TRACER and includes this header.
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|
*/
|
|
JSObject *builtinFunctions[JSBUILTIN_LIMIT];
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|
|
/* List of active contexts sharing this runtime; protected by gcLock. */
|
|
JSCList contextList;
|
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|
|
/* Per runtime debug hooks -- see jsprvtd.h and jsdbgapi.h. */
|
|
JSDebugHooks globalDebugHooks;
|
|
|
|
/* More debugging state, see jsdbgapi.c. */
|
|
JSCList trapList;
|
|
JSCList watchPointList;
|
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|
|
/* Client opaque pointers */
|
|
void *data;
|
|
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|
#ifdef JS_THREADSAFE
|
|
/* These combine to interlock the GC and new requests. */
|
|
PRLock *gcLock;
|
|
PRCondVar *gcDone;
|
|
PRCondVar *requestDone;
|
|
uint32 requestCount;
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|
JSThread *gcThread;
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|
|
|
/* Lock and owning thread pointer for JS_LOCK_RUNTIME. */
|
|
PRLock *rtLock;
|
|
#ifdef DEBUG
|
|
jsword rtLockOwner;
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|
#endif
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|
|
/* Used to synchronize down/up state change; protected by gcLock. */
|
|
PRCondVar *stateChange;
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|
|
/*
|
|
* State for sharing single-threaded titles, once a second thread tries to
|
|
* lock a title. The titleSharingDone condvar is protected by rt->gcLock
|
|
* to minimize number of locks taken in JS_EndRequest.
|
|
*
|
|
* The titleSharingTodo linked list is likewise "global" per runtime, not
|
|
* one-list-per-context, to conserve space over all contexts, optimizing
|
|
* for the likely case that titles become shared rarely, and among a very
|
|
* small set of threads (contexts).
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|
*/
|
|
PRCondVar *titleSharingDone;
|
|
JSTitle *titleSharingTodo;
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|
|
/*
|
|
* Magic terminator for the rt->titleSharingTodo linked list, threaded through
|
|
* title->u.link. This hack allows us to test whether a title is on the list
|
|
* by asking whether title->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_TITLE_SHARING_TODO ((JSTitle *) 0xfeedbeef)
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|
|
|
/*
|
|
* Lock serializing trapList and watchPointList accesses, and count of all
|
|
* mutations to trapList and watchPointList made by debugger threads. To
|
|
* keep the code simple, we define debuggerMutations for the thread-unsafe
|
|
* case too.
|
|
*/
|
|
PRLock *debuggerLock;
|
|
|
|
JSDHashTable threads;
|
|
#endif /* JS_THREADSAFE */
|
|
uint32 debuggerMutations;
|
|
|
|
/*
|
|
* Security callbacks set on the runtime are used by each context unless
|
|
* an override is set on the context.
|
|
*/
|
|
JSSecurityCallbacks *securityCallbacks;
|
|
|
|
/*
|
|
* Shared scope property tree, and arena-pool for allocating its nodes.
|
|
* The propertyRemovals counter is incremented for every js_ClearScope,
|
|
* and for each js_RemoveScopeProperty that frees a slot in an object.
|
|
* See js_NativeGet and js_NativeSet in jsobj.c.
|
|
*/
|
|
JSDHashTable propertyTreeHash;
|
|
JSScopeProperty *propertyFreeList;
|
|
JSArenaPool propertyArenaPool;
|
|
int32 propertyRemovals;
|
|
|
|
/* Script filename table. */
|
|
struct JSHashTable *scriptFilenameTable;
|
|
JSCList scriptFilenamePrefixes;
|
|
#ifdef JS_THREADSAFE
|
|
PRLock *scriptFilenameTableLock;
|
|
#endif
|
|
|
|
/* Number localization, used by jsnum.c */
|
|
const char *thousandsSeparator;
|
|
const char *decimalSeparator;
|
|
const char *numGrouping;
|
|
|
|
/*
|
|
* Weak references to lazily-created, well-known XML singletons.
|
|
*
|
|
* NB: Singleton objects must be carefully disconnected from the rest of
|
|
* the object graph usually associated with a JSContext's global object,
|
|
* including the set of standard class objects. See jsxml.c for details.
|
|
*/
|
|
JSObject *anynameObject;
|
|
JSObject *functionNamespaceObject;
|
|
|
|
/*
|
|
* A helper list for the GC, so it can mark native iterator states. See
|
|
* js_TraceNativeEnumerators for details.
|
|
*/
|
|
JSNativeEnumerator *nativeEnumerators;
|
|
|
|
#ifndef JS_THREADSAFE
|
|
JSThreadData threadData;
|
|
|
|
#define JS_THREAD_DATA(cx) (&(cx)->runtime->threadData)
|
|
#endif
|
|
|
|
/*
|
|
* Object shape (property cache structural type) identifier generator.
|
|
*
|
|
* Type 0 stands for the empty scope, and must not be regenerated due to
|
|
* uint32 wrap-around. Since js_GenerateShape (in jsinterp.cpp) uses
|
|
* atomic pre-increment, the initial value for the first typed non-empty
|
|
* scope will be 1.
|
|
*
|
|
* If this counter overflows into SHAPE_OVERFLOW_BIT (in jsinterp.h), the
|
|
* cache is disabled, to avoid aliasing two different types. It stays
|
|
* disabled until a triggered GC at some later moment compresses live
|
|
* types, minimizing rt->shapeGen in the process.
|
|
*/
|
|
volatile uint32 shapeGen;
|
|
|
|
/* Literal table maintained by jsatom.c functions. */
|
|
JSAtomState atomState;
|
|
|
|
/*
|
|
* Cache of reusable JSNativeEnumerators mapped by shape identifiers (as
|
|
* stored in scope->shape). This cache is nulled by the GC and protected
|
|
* by gcLock.
|
|
*/
|
|
#define NATIVE_ENUM_CACHE_LOG2 8
|
|
#define NATIVE_ENUM_CACHE_MASK JS_BITMASK(NATIVE_ENUM_CACHE_LOG2)
|
|
#define NATIVE_ENUM_CACHE_SIZE JS_BIT(NATIVE_ENUM_CACHE_LOG2)
|
|
|
|
#define NATIVE_ENUM_CACHE_HASH(shape) \
|
|
((((shape) >> NATIVE_ENUM_CACHE_LOG2) ^ (shape)) & NATIVE_ENUM_CACHE_MASK)
|
|
|
|
jsuword nativeEnumCache[NATIVE_ENUM_CACHE_SIZE];
|
|
|
|
/*
|
|
* Various metering fields are defined at the end of JSRuntime. In this
|
|
* way there is no need to recompile all the code that refers to other
|
|
* fields of JSRuntime after enabling the corresponding metering macro.
|
|
*/
|
|
#ifdef JS_DUMP_ENUM_CACHE_STATS
|
|
int32 nativeEnumProbes;
|
|
int32 nativeEnumMisses;
|
|
# define ENUM_CACHE_METER(name) JS_ATOMIC_INCREMENT(&cx->runtime->name)
|
|
#else
|
|
# define ENUM_CACHE_METER(name) ((void) 0)
|
|
#endif
|
|
|
|
#ifdef JS_DUMP_LOOP_STATS
|
|
/* Loop statistics, to trigger trace recording and compiling. */
|
|
JSBasicStats loopStats;
|
|
#endif
|
|
|
|
#if defined DEBUG || defined JS_DUMP_PROPTREE_STATS
|
|
/* Function invocation metering. */
|
|
jsrefcount inlineCalls;
|
|
jsrefcount nativeCalls;
|
|
jsrefcount nonInlineCalls;
|
|
jsrefcount constructs;
|
|
|
|
/* Title lock and scope property metering. */
|
|
jsrefcount claimAttempts;
|
|
jsrefcount claimedTitles;
|
|
jsrefcount deadContexts;
|
|
jsrefcount deadlocksAvoided;
|
|
jsrefcount liveScopes;
|
|
jsrefcount sharedTitles;
|
|
jsrefcount totalScopes;
|
|
jsrefcount liveScopeProps;
|
|
jsrefcount liveScopePropsPreSweep;
|
|
jsrefcount totalScopeProps;
|
|
jsrefcount livePropTreeNodes;
|
|
jsrefcount duplicatePropTreeNodes;
|
|
jsrefcount totalPropTreeNodes;
|
|
jsrefcount propTreeKidsChunks;
|
|
jsrefcount middleDeleteFixups;
|
|
|
|
/* String instrumentation. */
|
|
jsrefcount liveStrings;
|
|
jsrefcount totalStrings;
|
|
jsrefcount liveDependentStrings;
|
|
jsrefcount totalDependentStrings;
|
|
jsrefcount badUndependStrings;
|
|
double lengthSum;
|
|
double lengthSquaredSum;
|
|
double strdepLengthSum;
|
|
double strdepLengthSquaredSum;
|
|
#endif /* DEBUG || JS_DUMP_PROPTREE_STATS */
|
|
|
|
#ifdef JS_SCOPE_DEPTH_METER
|
|
/*
|
|
* Stats on runtime prototype chain lookups and scope chain depths, i.e.,
|
|
* counts of objects traversed on a chain until the wanted id is found.
|
|
*/
|
|
JSBasicStats protoLookupDepthStats;
|
|
JSBasicStats scopeSearchDepthStats;
|
|
|
|
/*
|
|
* Stats on compile-time host environment and lexical scope chain lengths
|
|
* (maximum depths).
|
|
*/
|
|
JSBasicStats hostenvScopeDepthStats;
|
|
JSBasicStats lexicalScopeDepthStats;
|
|
#endif
|
|
|
|
#ifdef JS_GCMETER
|
|
JSGCStats gcStats;
|
|
#endif
|
|
|
|
#ifdef JS_FUNCTION_METERING
|
|
JSFunctionMeter functionMeter;
|
|
char lastScriptFilename[1024];
|
|
#endif
|
|
};
|
|
|
|
/* Common macros to access thread-local caches in JSThread or JSRuntime. */
|
|
#define JS_GSN_CACHE(cx) (JS_THREAD_DATA(cx)->gsnCache)
|
|
#define JS_PROPERTY_CACHE(cx) (JS_THREAD_DATA(cx)->propertyCache)
|
|
#define JS_TRACE_MONITOR(cx) (JS_THREAD_DATA(cx)->traceMonitor)
|
|
#define JS_SCRIPTS_TO_GC(cx) (JS_THREAD_DATA(cx)->scriptsToGC)
|
|
|
|
#ifdef JS_EVAL_CACHE_METERING
|
|
# define EVAL_CACHE_METER(x) (JS_THREAD_DATA(cx)->evalCacheMeter.x++)
|
|
#else
|
|
# define EVAL_CACHE_METER(x) ((void) 0)
|
|
#endif
|
|
|
|
#ifdef DEBUG
|
|
# define JS_RUNTIME_METER(rt, which) JS_ATOMIC_INCREMENT(&(rt)->which)
|
|
# define JS_RUNTIME_UNMETER(rt, which) JS_ATOMIC_DECREMENT(&(rt)->which)
|
|
#else
|
|
# define JS_RUNTIME_METER(rt, which) /* nothing */
|
|
# define JS_RUNTIME_UNMETER(rt, which) /* nothing */
|
|
#endif
|
|
|
|
#define JS_KEEP_ATOMS(rt) JS_ATOMIC_INCREMENT(&(rt)->gcKeepAtoms);
|
|
#define JS_UNKEEP_ATOMS(rt) JS_ATOMIC_DECREMENT(&(rt)->gcKeepAtoms);
|
|
|
|
#ifdef JS_ARGUMENT_FORMATTER_DEFINED
|
|
/*
|
|
* Linked list mapping format strings for JS_{Convert,Push}Arguments{,VA} to
|
|
* formatter functions. Elements are sorted in non-increasing format string
|
|
* length order.
|
|
*/
|
|
struct JSArgumentFormatMap {
|
|
const char *format;
|
|
size_t length;
|
|
JSArgumentFormatter formatter;
|
|
JSArgumentFormatMap *next;
|
|
};
|
|
#endif
|
|
|
|
struct JSStackHeader {
|
|
uintN nslots;
|
|
JSStackHeader *down;
|
|
};
|
|
|
|
#define JS_STACK_SEGMENT(sh) ((jsval *)(sh) + 2)
|
|
|
|
/*
|
|
* Key and entry types for the JSContext.resolvingTable hash table, typedef'd
|
|
* here because all consumers need to see these declarations (and not just the
|
|
* typedef names, as would be the case for an opaque pointer-to-typedef'd-type
|
|
* declaration), along with cx->resolvingTable.
|
|
*/
|
|
typedef struct JSResolvingKey {
|
|
JSObject *obj;
|
|
jsid id;
|
|
} JSResolvingKey;
|
|
|
|
typedef struct JSResolvingEntry {
|
|
JSDHashEntryHdr hdr;
|
|
JSResolvingKey key;
|
|
uint32 flags;
|
|
} JSResolvingEntry;
|
|
|
|
#define JSRESFLAG_LOOKUP 0x1 /* resolving id from lookup */
|
|
#define JSRESFLAG_WATCH 0x2 /* resolving id from watch */
|
|
|
|
typedef struct JSLocalRootChunk JSLocalRootChunk;
|
|
|
|
#define JSLRS_CHUNK_SHIFT 8
|
|
#define JSLRS_CHUNK_SIZE JS_BIT(JSLRS_CHUNK_SHIFT)
|
|
#define JSLRS_CHUNK_MASK JS_BITMASK(JSLRS_CHUNK_SHIFT)
|
|
|
|
struct JSLocalRootChunk {
|
|
jsval roots[JSLRS_CHUNK_SIZE];
|
|
JSLocalRootChunk *down;
|
|
};
|
|
|
|
typedef struct JSLocalRootStack {
|
|
uint32 scopeMark;
|
|
uint32 rootCount;
|
|
JSLocalRootChunk *topChunk;
|
|
JSLocalRootChunk firstChunk;
|
|
} JSLocalRootStack;
|
|
|
|
#define JSLRS_NULL_MARK ((uint32) -1)
|
|
|
|
/*
|
|
* Macros to push/pop JSTempValueRooter instances to context-linked stack of
|
|
* temporary GC roots. If you need to protect a result value that flows out of
|
|
* a C function across several layers of other functions, use the
|
|
* js_LeaveLocalRootScopeWithResult internal API (see further below) instead.
|
|
*
|
|
* The macros also provide a simple way to get a single rooted pointer via
|
|
* JS_PUSH_TEMP_ROOT_<KIND>(cx, NULL, &tvr). Then &tvr.u.<kind> gives the
|
|
* necessary pointer.
|
|
*
|
|
* JSTempValueRooter.count defines the type of the rooted value referenced by
|
|
* JSTempValueRooter.u union of type JSTempValueUnion. When count is positive
|
|
* or zero, u.array points to a vector of jsvals. Otherwise it must be one of
|
|
* the following constants:
|
|
*/
|
|
#define JSTVU_SINGLE (-1) /* u.value or u.<gcthing> is single jsval
|
|
or GC-thing */
|
|
#define JSTVU_TRACE (-2) /* u.trace is a hook to trace a custom
|
|
* structure */
|
|
#define JSTVU_SPROP (-3) /* u.sprop roots property tree node */
|
|
#define JSTVU_WEAK_ROOTS (-4) /* u.weakRoots points to saved weak roots */
|
|
#define JSTVU_COMPILER (-5) /* u.compiler roots JSCompiler* */
|
|
#define JSTVU_SCRIPT (-6) /* u.script roots JSScript* */
|
|
|
|
/*
|
|
* Here single JSTVU_SINGLE covers both jsval and pointers to any GC-thing via
|
|
* reinterpreting the thing as JSVAL_OBJECT. It works because the GC-thing is
|
|
* aligned on a 0 mod 8 boundary, and object has the 0 jsval tag. So any
|
|
* GC-thing may be tagged as if it were an object and untagged, if it's then
|
|
* used only as an opaque pointer until discriminated by other means than tag
|
|
* bits. This is how, for example, js_GetGCThingTraceKind uses its |thing|
|
|
* parameter -- it consults GC-thing flags stored separately from the thing to
|
|
* decide the kind of thing.
|
|
*/
|
|
#define JS_PUSH_TEMP_ROOT_COMMON(cx,x,tvr,cnt,kind) \
|
|
JS_BEGIN_MACRO \
|
|
JS_ASSERT((cx)->tempValueRooters != (tvr)); \
|
|
(tvr)->count = (cnt); \
|
|
(tvr)->u.kind = (x); \
|
|
(tvr)->down = (cx)->tempValueRooters; \
|
|
(cx)->tempValueRooters = (tvr); \
|
|
JS_END_MACRO
|
|
|
|
#define JS_POP_TEMP_ROOT(cx,tvr) \
|
|
JS_BEGIN_MACRO \
|
|
JS_ASSERT((cx)->tempValueRooters == (tvr)); \
|
|
(cx)->tempValueRooters = (tvr)->down; \
|
|
JS_END_MACRO
|
|
|
|
#define JS_PUSH_TEMP_ROOT(cx,cnt,arr,tvr) \
|
|
JS_BEGIN_MACRO \
|
|
JS_ASSERT((int)(cnt) >= 0); \
|
|
JS_PUSH_TEMP_ROOT_COMMON(cx, arr, tvr, (ptrdiff_t) (cnt), array); \
|
|
JS_END_MACRO
|
|
|
|
#define JS_PUSH_SINGLE_TEMP_ROOT(cx,val,tvr) \
|
|
JS_PUSH_TEMP_ROOT_COMMON(cx, val, tvr, JSTVU_SINGLE, value)
|
|
|
|
#define JS_PUSH_TEMP_ROOT_OBJECT(cx,obj,tvr) \
|
|
JS_PUSH_TEMP_ROOT_COMMON(cx, obj, tvr, JSTVU_SINGLE, object)
|
|
|
|
#define JS_PUSH_TEMP_ROOT_STRING(cx,str,tvr) \
|
|
JS_PUSH_TEMP_ROOT_COMMON(cx, str, tvr, JSTVU_SINGLE, string)
|
|
|
|
#define JS_PUSH_TEMP_ROOT_XML(cx,xml_,tvr) \
|
|
JS_PUSH_TEMP_ROOT_COMMON(cx, xml_, tvr, JSTVU_SINGLE, xml)
|
|
|
|
#define JS_PUSH_TEMP_ROOT_TRACE(cx,trace_,tvr) \
|
|
JS_PUSH_TEMP_ROOT_COMMON(cx, trace_, tvr, JSTVU_TRACE, trace)
|
|
|
|
#define JS_PUSH_TEMP_ROOT_SPROP(cx,sprop_,tvr) \
|
|
JS_PUSH_TEMP_ROOT_COMMON(cx, sprop_, tvr, JSTVU_SPROP, sprop)
|
|
|
|
#define JS_PUSH_TEMP_ROOT_WEAK_COPY(cx,weakRoots_,tvr) \
|
|
JS_PUSH_TEMP_ROOT_COMMON(cx, weakRoots_, tvr, JSTVU_WEAK_ROOTS, weakRoots)
|
|
|
|
#define JS_PUSH_TEMP_ROOT_COMPILER(cx,pc,tvr) \
|
|
JS_PUSH_TEMP_ROOT_COMMON(cx, pc, tvr, JSTVU_COMPILER, compiler)
|
|
|
|
#define JS_PUSH_TEMP_ROOT_SCRIPT(cx,script_,tvr) \
|
|
JS_PUSH_TEMP_ROOT_COMMON(cx, script_, tvr, JSTVU_SCRIPT, script)
|
|
|
|
|
|
#define JSRESOLVE_INFER 0xffff /* infer bits from current bytecode */
|
|
|
|
struct JSContext {
|
|
/*
|
|
* If this flag is set, we were asked to call back the operation callback
|
|
* as soon as possible.
|
|
*/
|
|
volatile jsint operationCallbackFlag;
|
|
|
|
/* JSRuntime contextList linkage. */
|
|
JSCList link;
|
|
|
|
#if JS_HAS_XML_SUPPORT
|
|
/*
|
|
* Bit-set formed from binary exponentials of the XML_* tiny-ids defined
|
|
* for boolean settings in jsxml.c, plus an XSF_CACHE_VALID bit. Together
|
|
* these act as a cache of the boolean XML.ignore* and XML.prettyPrinting
|
|
* property values associated with this context's global object.
|
|
*/
|
|
uint8 xmlSettingFlags;
|
|
uint8 padding;
|
|
#else
|
|
uint16 padding;
|
|
#endif
|
|
|
|
/*
|
|
* Classic Algol "display" static link optimization.
|
|
*/
|
|
#define JS_DISPLAY_SIZE 16U
|
|
|
|
JSStackFrame *display[JS_DISPLAY_SIZE];
|
|
|
|
/* Runtime version control identifier. */
|
|
uint16 version;
|
|
|
|
/* Per-context options. */
|
|
uint32 options; /* see jsapi.h for JSOPTION_* */
|
|
|
|
/* Locale specific callbacks for string conversion. */
|
|
JSLocaleCallbacks *localeCallbacks;
|
|
|
|
/*
|
|
* cx->resolvingTable is non-null and non-empty if we are initializing
|
|
* standard classes lazily, or if we are otherwise recursing indirectly
|
|
* from js_LookupProperty through a JSClass.resolve hook. It is used to
|
|
* limit runaway recursion (see jsapi.c and jsobj.c).
|
|
*/
|
|
JSDHashTable *resolvingTable;
|
|
|
|
#if JS_HAS_LVALUE_RETURN
|
|
/*
|
|
* Secondary return value from native method called on the left-hand side
|
|
* of an assignment operator. The native should store the object in which
|
|
* to set a property in *rval, and return the property's id expressed as a
|
|
* jsval by calling JS_SetCallReturnValue2(cx, idval).
|
|
*/
|
|
jsval rval2;
|
|
JSPackedBool rval2set;
|
|
#endif
|
|
|
|
/*
|
|
* True if generating an error, to prevent runaway recursion.
|
|
* NB: generatingError packs with rval2set, #if JS_HAS_LVALUE_RETURN;
|
|
* with insideGCMarkCallback and with throwing below.
|
|
*/
|
|
JSPackedBool generatingError;
|
|
|
|
/* Flag to indicate that we run inside gcCallback(cx, JSGC_MARK_END). */
|
|
JSPackedBool insideGCMarkCallback;
|
|
|
|
/* Exception state -- the exception member is a GC root by definition. */
|
|
JSPackedBool throwing; /* is there a pending exception? */
|
|
jsval exception; /* most-recently-thrown exception */
|
|
|
|
/* Limit pointer for checking native stack consumption during recursion. */
|
|
jsuword stackLimit;
|
|
|
|
/* Quota on the size of arenas used to compile and execute scripts. */
|
|
size_t scriptStackQuota;
|
|
|
|
/* Data shared by threads in an address space. */
|
|
JSRuntime *runtime;
|
|
|
|
/* Stack arena pool and frame pointer register. */
|
|
JS_REQUIRES_STACK
|
|
JSArenaPool stackPool;
|
|
|
|
JS_REQUIRES_STACK
|
|
JSStackFrame *fp;
|
|
|
|
/* Temporary arena pool used while compiling and decompiling. */
|
|
JSArenaPool tempPool;
|
|
|
|
/* Top-level object and pointer to top stack frame's scope chain. */
|
|
JSObject *globalObject;
|
|
|
|
/* Storage to root recently allocated GC things and script result. */
|
|
JSWeakRoots weakRoots;
|
|
|
|
/* Regular expression class statics (XXX not shared globally). */
|
|
JSRegExpStatics regExpStatics;
|
|
|
|
/* State for object and array toSource conversion. */
|
|
JSSharpObjectMap sharpObjectMap;
|
|
|
|
/* Argument formatter support for JS_{Convert,Push}Arguments{,VA}. */
|
|
JSArgumentFormatMap *argumentFormatMap;
|
|
|
|
/* Last message string and trace file for debugging. */
|
|
char *lastMessage;
|
|
#ifdef DEBUG
|
|
void *tracefp;
|
|
jsbytecode *tracePrevPc;
|
|
#endif
|
|
|
|
/* Per-context optional error reporter. */
|
|
JSErrorReporter errorReporter;
|
|
|
|
/* Branch callback. */
|
|
JSOperationCallback operationCallback;
|
|
|
|
/* Interpreter activation count. */
|
|
uintN interpLevel;
|
|
|
|
/* Client opaque pointers. */
|
|
void *data;
|
|
void *data2;
|
|
|
|
/* GC and thread-safe state. */
|
|
JSStackFrame *dormantFrameChain; /* dormant stack frame to scan */
|
|
#ifdef JS_THREADSAFE
|
|
JSThread *thread;
|
|
jsrefcount requestDepth;
|
|
/* Same as requestDepth but ignoring JS_SuspendRequest/JS_ResumeRequest */
|
|
jsrefcount outstandingRequests;
|
|
JSTitle *lockedSealedTitle; /* weak ref, for low-cost sealed
|
|
title locking */
|
|
JSCList threadLinks; /* JSThread contextList linkage */
|
|
|
|
#define CX_FROM_THREAD_LINKS(tl) \
|
|
((JSContext *)((char *)(tl) - offsetof(JSContext, threadLinks)))
|
|
#endif
|
|
|
|
/* PDL of stack headers describing stack slots not rooted by argv, etc. */
|
|
JSStackHeader *stackHeaders;
|
|
|
|
/* Optional stack of heap-allocated scoped local GC roots. */
|
|
JSLocalRootStack *localRootStack;
|
|
|
|
/* Stack of thread-stack-allocated temporary GC roots. */
|
|
JSTempValueRooter *tempValueRooters;
|
|
|
|
#ifdef JS_THREADSAFE
|
|
JSGCFreeListSet *gcLocalFreeLists;
|
|
#endif
|
|
|
|
/* List of pre-allocated doubles. */
|
|
JSGCDoubleCell *doubleFreeList;
|
|
|
|
/* Debug hooks associated with the current context. */
|
|
JSDebugHooks *debugHooks;
|
|
|
|
/* Security callbacks that override any defined on the runtime. */
|
|
JSSecurityCallbacks *securityCallbacks;
|
|
|
|
/* Pinned regexp pool used for regular expressions. */
|
|
JSArenaPool regexpPool;
|
|
|
|
/* Stored here to avoid passing it around as a parameter. */
|
|
uintN resolveFlags;
|
|
|
|
#ifdef JS_TRACER
|
|
/*
|
|
* State for the current tree execution. bailExit is valid if the tree has
|
|
* called back into native code via a _FAIL builtin and has not yet bailed,
|
|
* else garbage (NULL in debug builds).
|
|
*/
|
|
InterpState *interpState;
|
|
VMSideExit *bailExit;
|
|
|
|
/* Used when calling natives from trace to root the vp vector. */
|
|
uintN nativeVpLen;
|
|
jsval *nativeVp;
|
|
#endif
|
|
};
|
|
|
|
#ifdef JS_THREADSAFE
|
|
# define JS_THREAD_ID(cx) ((cx)->thread ? (cx)->thread->id : 0)
|
|
#endif
|
|
|
|
#ifdef __cplusplus
|
|
|
|
static inline JSAtom **
|
|
FrameAtomBase(JSContext *cx, JSStackFrame *fp)
|
|
{
|
|
return fp->imacpc
|
|
? COMMON_ATOMS_START(&cx->runtime->atomState)
|
|
: fp->script->atomMap.vector;
|
|
}
|
|
|
|
/* FIXME(bug 332648): Move this into a public header. */
|
|
class JSAutoTempValueRooter
|
|
{
|
|
public:
|
|
JSAutoTempValueRooter(JSContext *cx, size_t len, jsval *vec)
|
|
: mContext(cx) {
|
|
JS_PUSH_TEMP_ROOT(mContext, len, vec, &mTvr);
|
|
}
|
|
explicit JSAutoTempValueRooter(JSContext *cx, jsval v = JSVAL_NULL)
|
|
: mContext(cx) {
|
|
JS_PUSH_SINGLE_TEMP_ROOT(mContext, v, &mTvr);
|
|
}
|
|
JSAutoTempValueRooter(JSContext *cx, JSString *str)
|
|
: mContext(cx) {
|
|
JS_PUSH_TEMP_ROOT_STRING(mContext, str, &mTvr);
|
|
}
|
|
JSAutoTempValueRooter(JSContext *cx, JSObject *obj)
|
|
: mContext(cx) {
|
|
JS_PUSH_TEMP_ROOT_OBJECT(mContext, obj, &mTvr);
|
|
}
|
|
|
|
~JSAutoTempValueRooter() {
|
|
JS_POP_TEMP_ROOT(mContext, &mTvr);
|
|
}
|
|
|
|
jsval value() { return mTvr.u.value; }
|
|
jsval *addr() { return &mTvr.u.value; }
|
|
|
|
protected:
|
|
JSContext *mContext;
|
|
|
|
private:
|
|
#ifndef AIX
|
|
static void *operator new(size_t);
|
|
static void operator delete(void *, size_t);
|
|
#endif
|
|
|
|
JSTempValueRooter mTvr;
|
|
};
|
|
|
|
class JSAutoTempIdRooter
|
|
{
|
|
public:
|
|
explicit JSAutoTempIdRooter(JSContext *cx, jsid id = INT_TO_JSID(0))
|
|
: mContext(cx) {
|
|
JS_PUSH_SINGLE_TEMP_ROOT(mContext, ID_TO_VALUE(id), &mTvr);
|
|
}
|
|
|
|
~JSAutoTempIdRooter() {
|
|
JS_POP_TEMP_ROOT(mContext, &mTvr);
|
|
}
|
|
|
|
jsid id() { return (jsid) mTvr.u.value; }
|
|
jsid * addr() { return (jsid *) &mTvr.u.value; }
|
|
|
|
private:
|
|
JSContext *mContext;
|
|
JSTempValueRooter mTvr;
|
|
};
|
|
|
|
class JSAutoResolveFlags
|
|
{
|
|
public:
|
|
JSAutoResolveFlags(JSContext *cx, uintN flags)
|
|
: mContext(cx), mSaved(cx->resolveFlags) {
|
|
cx->resolveFlags = flags;
|
|
}
|
|
|
|
~JSAutoResolveFlags() { mContext->resolveFlags = mSaved; }
|
|
|
|
private:
|
|
JSContext *mContext;
|
|
uintN mSaved;
|
|
};
|
|
|
|
#endif /* __cpluscplus */
|
|
|
|
/*
|
|
* Slightly more readable macros for testing per-context option settings (also
|
|
* to hide bitset implementation detail).
|
|
*
|
|
* JSOPTION_XML must be handled specially in order to propagate from compile-
|
|
* to run-time (from cx->options to script->version/cx->version). To do that,
|
|
* we copy JSOPTION_XML from cx->options into cx->version as JSVERSION_HAS_XML
|
|
* whenever options are set, and preserve this XML flag across version number
|
|
* changes done via the JS_SetVersion API.
|
|
*
|
|
* But when executing a script or scripted function, the interpreter changes
|
|
* cx->version, including the XML flag, to script->version. Thus JSOPTION_XML
|
|
* is a compile-time option that causes a run-time version change during each
|
|
* activation of the compiled script. That version change has the effect of
|
|
* changing JS_HAS_XML_OPTION, so that any compiling done via eval enables XML
|
|
* support. If an XML-enabled script or function calls a non-XML function,
|
|
* the flag bit will be cleared during the callee's activation.
|
|
*
|
|
* Note that JS_SetVersion API calls never pass JSVERSION_HAS_XML or'd into
|
|
* that API's version parameter.
|
|
*
|
|
* Note also that script->version must contain this XML option flag in order
|
|
* for XDR'ed scripts to serialize and deserialize with that option preserved
|
|
* for detection at run-time. We can't copy other compile-time options into
|
|
* script->version because that would break backward compatibility (certain
|
|
* other options, e.g. JSOPTION_VAROBJFIX, are analogous to JSOPTION_XML).
|
|
*/
|
|
#define JS_HAS_OPTION(cx,option) (((cx)->options & (option)) != 0)
|
|
#define JS_HAS_STRICT_OPTION(cx) JS_HAS_OPTION(cx, JSOPTION_STRICT)
|
|
#define JS_HAS_WERROR_OPTION(cx) JS_HAS_OPTION(cx, JSOPTION_WERROR)
|
|
#define JS_HAS_COMPILE_N_GO_OPTION(cx) JS_HAS_OPTION(cx, JSOPTION_COMPILE_N_GO)
|
|
#define JS_HAS_ATLINE_OPTION(cx) JS_HAS_OPTION(cx, JSOPTION_ATLINE)
|
|
|
|
#define JSVERSION_MASK 0x0FFF /* see JSVersion in jspubtd.h */
|
|
#define JSVERSION_HAS_XML 0x1000 /* flag induced by XML option */
|
|
#define JSVERSION_ANONFUNFIX 0x2000 /* see jsapi.h, the comments
|
|
for JSOPTION_ANONFUNFIX */
|
|
|
|
#define JSVERSION_NUMBER(cx) ((JSVersion)((cx)->version & \
|
|
JSVERSION_MASK))
|
|
#define JS_HAS_XML_OPTION(cx) ((cx)->version & JSVERSION_HAS_XML || \
|
|
JSVERSION_NUMBER(cx) >= JSVERSION_1_6)
|
|
|
|
extern JSBool
|
|
js_InitThreads(JSRuntime *rt);
|
|
|
|
extern void
|
|
js_FinishThreads(JSRuntime *rt);
|
|
|
|
extern void
|
|
js_PurgeThreads(JSContext *cx);
|
|
|
|
/*
|
|
* Ensures the JSOPTION_XML and JSOPTION_ANONFUNFIX bits of cx->options are
|
|
* reflected in cx->version, since each bit must travel with a script that has
|
|
* it set.
|
|
*/
|
|
extern void
|
|
js_SyncOptionsToVersion(JSContext *cx);
|
|
|
|
/*
|
|
* Common subroutine of JS_SetVersion and js_SetVersion, to update per-context
|
|
* data that depends on version.
|
|
*/
|
|
extern void
|
|
js_OnVersionChange(JSContext *cx);
|
|
|
|
/*
|
|
* Unlike the JS_SetVersion API, this function stores JSVERSION_HAS_XML and
|
|
* any future non-version-number flags induced by compiler options.
|
|
*/
|
|
extern void
|
|
js_SetVersion(JSContext *cx, JSVersion version);
|
|
|
|
/*
|
|
* Create and destroy functions for JSContext, which is manually allocated
|
|
* and exclusively owned.
|
|
*/
|
|
extern JSContext *
|
|
js_NewContext(JSRuntime *rt, size_t stackChunkSize);
|
|
|
|
extern void
|
|
js_DestroyContext(JSContext *cx, JSDestroyContextMode mode);
|
|
|
|
/*
|
|
* Return true if cx points to a context in rt->contextList, else return false.
|
|
* NB: the caller (see jslock.c:ClaimTitle) must hold rt->gcLock.
|
|
*/
|
|
extern JSBool
|
|
js_ValidContextPointer(JSRuntime *rt, JSContext *cx);
|
|
|
|
static JS_INLINE JSContext *
|
|
js_ContextFromLinkField(JSCList *link)
|
|
{
|
|
JS_ASSERT(link);
|
|
return (JSContext *) ((uint8 *) link - offsetof(JSContext, link));
|
|
}
|
|
|
|
/*
|
|
* If unlocked, acquire and release rt->gcLock around *iterp update; otherwise
|
|
* the caller must be holding rt->gcLock.
|
|
*/
|
|
extern JSContext *
|
|
js_ContextIterator(JSRuntime *rt, JSBool unlocked, JSContext **iterp);
|
|
|
|
/*
|
|
* Iterate through contexts with active requests. The caller must be holding
|
|
* rt->gcLock in case of a thread-safe build, or otherwise guarantee that the
|
|
* context list is not alternated asynchroniously.
|
|
*/
|
|
extern JS_FRIEND_API(JSContext *)
|
|
js_NextActiveContext(JSRuntime *, JSContext *);
|
|
|
|
#ifdef JS_THREADSAFE
|
|
|
|
/*
|
|
* Count the number of contexts entered requests on the current thread.
|
|
*/
|
|
uint32
|
|
js_CountThreadRequests(JSContext *cx);
|
|
|
|
/*
|
|
* This is a helper for code at can potentially run outside JS request to
|
|
* ensure that the GC is not running when the function returns.
|
|
*
|
|
* This function must be called with the GC lock held.
|
|
*/
|
|
extern void
|
|
js_WaitForGC(JSRuntime *rt);
|
|
|
|
/*
|
|
* If we're in one or more requests (possibly on more than one context)
|
|
* running on the current thread, indicate, temporarily, that all these
|
|
* requests are inactive so a possible GC can proceed on another thread.
|
|
* This function returns the number of discounted requests. The number must
|
|
* be passed later to js_ActivateRequestAfterGC to reactivate the requests.
|
|
*
|
|
* This function must be called with the GC lock held.
|
|
*/
|
|
uint32
|
|
js_DiscountRequestsForGC(JSContext *cx);
|
|
|
|
/*
|
|
* This function must be called with the GC lock held.
|
|
*/
|
|
void
|
|
js_RecountRequestsAfterGC(JSRuntime *rt, uint32 requestDebit);
|
|
|
|
#else /* !JS_THREADSAFE */
|
|
|
|
# define js_WaitForGC(rt) ((void) 0)
|
|
|
|
#endif
|
|
|
|
/*
|
|
* JSClass.resolve and watchpoint recursion damping machinery.
|
|
*/
|
|
extern JSBool
|
|
js_StartResolving(JSContext *cx, JSResolvingKey *key, uint32 flag,
|
|
JSResolvingEntry **entryp);
|
|
|
|
extern void
|
|
js_StopResolving(JSContext *cx, JSResolvingKey *key, uint32 flag,
|
|
JSResolvingEntry *entry, uint32 generation);
|
|
|
|
/*
|
|
* Local root set management.
|
|
*
|
|
* NB: the jsval parameters below may be properly tagged jsvals, or GC-thing
|
|
* pointers cast to (jsval). This relies on JSObject's tag being zero, but
|
|
* on the up side it lets us push int-jsval-encoded scopeMark values on the
|
|
* local root stack.
|
|
*/
|
|
extern JSBool
|
|
js_EnterLocalRootScope(JSContext *cx);
|
|
|
|
#define js_LeaveLocalRootScope(cx) \
|
|
js_LeaveLocalRootScopeWithResult(cx, JSVAL_NULL)
|
|
|
|
extern void
|
|
js_LeaveLocalRootScopeWithResult(JSContext *cx, jsval rval);
|
|
|
|
extern void
|
|
js_ForgetLocalRoot(JSContext *cx, jsval v);
|
|
|
|
extern int
|
|
js_PushLocalRoot(JSContext *cx, JSLocalRootStack *lrs, jsval v);
|
|
|
|
extern void
|
|
js_TraceLocalRoots(JSTracer *trc, JSLocalRootStack *lrs);
|
|
|
|
/*
|
|
* Report an exception, which is currently realized as a printf-style format
|
|
* string and its arguments.
|
|
*/
|
|
typedef enum JSErrNum {
|
|
#define MSG_DEF(name, number, count, exception, format) \
|
|
name = number,
|
|
#include "js.msg"
|
|
#undef MSG_DEF
|
|
JSErr_Limit
|
|
} JSErrNum;
|
|
|
|
extern JS_FRIEND_API(const JSErrorFormatString *)
|
|
js_GetErrorMessage(void *userRef, const char *locale, const uintN errorNumber);
|
|
|
|
#ifdef va_start
|
|
extern JSBool
|
|
js_ReportErrorVA(JSContext *cx, uintN flags, const char *format, va_list ap);
|
|
|
|
extern JSBool
|
|
js_ReportErrorNumberVA(JSContext *cx, uintN flags, JSErrorCallback callback,
|
|
void *userRef, const uintN errorNumber,
|
|
JSBool charArgs, va_list ap);
|
|
|
|
extern JSBool
|
|
js_ExpandErrorArguments(JSContext *cx, JSErrorCallback callback,
|
|
void *userRef, const uintN errorNumber,
|
|
char **message, JSErrorReport *reportp,
|
|
JSBool *warningp, JSBool charArgs, va_list ap);
|
|
#endif
|
|
|
|
extern void
|
|
js_ReportOutOfMemory(JSContext *cx);
|
|
|
|
/*
|
|
* Report that cx->scriptStackQuota is exhausted.
|
|
*/
|
|
extern void
|
|
js_ReportOutOfScriptQuota(JSContext *cx);
|
|
|
|
extern void
|
|
js_ReportOverRecursed(JSContext *cx);
|
|
|
|
extern void
|
|
js_ReportAllocationOverflow(JSContext *cx);
|
|
|
|
#define JS_CHECK_RECURSION(cx, onerror) \
|
|
JS_BEGIN_MACRO \
|
|
int stackDummy_; \
|
|
\
|
|
if (!JS_CHECK_STACK_SIZE(cx, stackDummy_)) { \
|
|
js_ReportOverRecursed(cx); \
|
|
onerror; \
|
|
} \
|
|
JS_END_MACRO
|
|
|
|
/*
|
|
* Report an exception using a previously composed JSErrorReport.
|
|
* XXXbe remove from "friend" API
|
|
*/
|
|
extern JS_FRIEND_API(void)
|
|
js_ReportErrorAgain(JSContext *cx, const char *message, JSErrorReport *report);
|
|
|
|
extern void
|
|
js_ReportIsNotDefined(JSContext *cx, const char *name);
|
|
|
|
/*
|
|
* Report an attempt to access the property of a null or undefined value (v).
|
|
*/
|
|
extern JSBool
|
|
js_ReportIsNullOrUndefined(JSContext *cx, intN spindex, jsval v,
|
|
JSString *fallback);
|
|
|
|
extern void
|
|
js_ReportMissingArg(JSContext *cx, jsval *vp, uintN arg);
|
|
|
|
/*
|
|
* Report error using js_DecompileValueGenerator(cx, spindex, v, fallback) as
|
|
* the first argument for the error message. If the error message has less
|
|
* then 3 arguments, use null for arg1 or arg2.
|
|
*/
|
|
extern JSBool
|
|
js_ReportValueErrorFlags(JSContext *cx, uintN flags, const uintN errorNumber,
|
|
intN spindex, jsval v, JSString *fallback,
|
|
const char *arg1, const char *arg2);
|
|
|
|
#define js_ReportValueError(cx,errorNumber,spindex,v,fallback) \
|
|
((void)js_ReportValueErrorFlags(cx, JSREPORT_ERROR, errorNumber, \
|
|
spindex, v, fallback, NULL, NULL))
|
|
|
|
#define js_ReportValueError2(cx,errorNumber,spindex,v,fallback,arg1) \
|
|
((void)js_ReportValueErrorFlags(cx, JSREPORT_ERROR, errorNumber, \
|
|
spindex, v, fallback, arg1, NULL))
|
|
|
|
#define js_ReportValueError3(cx,errorNumber,spindex,v,fallback,arg1,arg2) \
|
|
((void)js_ReportValueErrorFlags(cx, JSREPORT_ERROR, errorNumber, \
|
|
spindex, v, fallback, arg1, arg2))
|
|
|
|
extern JSErrorFormatString js_ErrorFormatString[JSErr_Limit];
|
|
|
|
/*
|
|
* See JS_SetThreadStackLimit in jsapi.c, where we check that the stack grows
|
|
* in the expected direction. On Unix-y systems, JS_STACK_GROWTH_DIRECTION is
|
|
* computed on the build host by jscpucfg.c and written into jsautocfg.h. The
|
|
* macro is hardcoded in jscpucfg.h on Windows and Mac systems (for historical
|
|
* reasons pre-dating autoconf usage).
|
|
*/
|
|
#if JS_STACK_GROWTH_DIRECTION > 0
|
|
# define JS_CHECK_STACK_SIZE(cx, lval) ((jsuword)&(lval) < (cx)->stackLimit)
|
|
#else
|
|
# define JS_CHECK_STACK_SIZE(cx, lval) ((jsuword)&(lval) > (cx)->stackLimit)
|
|
#endif
|
|
|
|
/*
|
|
* If the operation callback flag was set, call the operation callback.
|
|
* This macro can run the full GC. Return true if it is OK to continue and
|
|
* false otherwise.
|
|
*/
|
|
#define JS_CHECK_OPERATION_LIMIT(cx) \
|
|
(!(cx)->operationCallbackFlag || js_InvokeOperationCallback(cx))
|
|
|
|
/*
|
|
* Invoke the operation callback and return false if the current execution
|
|
* is to be terminated.
|
|
*/
|
|
extern JSBool
|
|
js_InvokeOperationCallback(JSContext *cx);
|
|
|
|
#ifndef JS_THREADSAFE
|
|
# define js_TriggerAllOperationCallbacks(rt, gcLocked) \
|
|
js_TriggerAllOperationCallbacks (rt)
|
|
#endif
|
|
|
|
void
|
|
js_TriggerAllOperationCallbacks(JSRuntime *rt, JSBool gcLocked);
|
|
|
|
extern JSStackFrame *
|
|
js_GetScriptedCaller(JSContext *cx, JSStackFrame *fp);
|
|
|
|
extern jsbytecode*
|
|
js_GetCurrentBytecodePC(JSContext* cx);
|
|
|
|
#ifdef JS_TRACER
|
|
/*
|
|
* Reconstruct the JS stack and clear cx->tracecx. We must be currently in a
|
|
* _FAIL builtin from trace on cx or another context on the same thread. The
|
|
* machine code for the trace remains on the C stack when js_DeepBail returns.
|
|
*
|
|
* Implemented in jstracer.cpp.
|
|
*/
|
|
JS_FORCES_STACK JS_FRIEND_API(void)
|
|
js_DeepBail(JSContext *cx);
|
|
#endif
|
|
|
|
static JS_FORCES_STACK JS_INLINE void
|
|
js_LeaveTrace(JSContext *cx)
|
|
{
|
|
#ifdef JS_TRACER
|
|
if (JS_ON_TRACE(cx))
|
|
js_DeepBail(cx);
|
|
#endif
|
|
}
|
|
|
|
static JS_INLINE void
|
|
js_LeaveTraceIfGlobalObject(JSContext *cx, JSObject *obj)
|
|
{
|
|
if (!obj->fslots[JSSLOT_PARENT])
|
|
js_LeaveTrace(cx);
|
|
}
|
|
|
|
static JS_INLINE JSBool
|
|
js_CanLeaveTrace(JSContext *cx)
|
|
{
|
|
JS_ASSERT(JS_ON_TRACE(cx));
|
|
#ifdef JS_TRACER
|
|
return cx->bailExit != NULL;
|
|
#else
|
|
return JS_FALSE;
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Get the current cx->fp, first lazily instantiating stack frames if needed.
|
|
* (Do not access cx->fp directly except in JS_REQUIRES_STACK code.)
|
|
*
|
|
* Defined in jstracer.cpp if JS_TRACER is defined.
|
|
*/
|
|
static JS_FORCES_STACK JS_INLINE JSStackFrame *
|
|
js_GetTopStackFrame(JSContext *cx)
|
|
{
|
|
js_LeaveTrace(cx);
|
|
return cx->fp;
|
|
}
|
|
|
|
static JS_INLINE JSBool
|
|
js_IsPropertyCacheDisabled(JSContext *cx)
|
|
{
|
|
return cx->runtime->shapeGen >= SHAPE_OVERFLOW_BIT;
|
|
}
|
|
|
|
static JS_INLINE uint32
|
|
js_RegenerateShapeForGC(JSContext *cx)
|
|
{
|
|
JS_ASSERT(cx->runtime->gcRunning);
|
|
|
|
/*
|
|
* Under the GC, compared with js_GenerateShape, we don't need to use
|
|
* atomic increments but we still must make sure that after an overflow
|
|
* the shape stays such.
|
|
*/
|
|
uint32 shape = cx->runtime->shapeGen;
|
|
shape = (shape + 1) | (shape & SHAPE_OVERFLOW_BIT);
|
|
cx->runtime->shapeGen = shape;
|
|
return shape;
|
|
}
|
|
|
|
JS_END_EXTERN_C
|
|
|
|
#endif /* jscntxt_h___ */
|