1/*
2 * Copyright (C) 2008 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17/*
18 * Variables with library scope.
19 *
20 * Prefer this over scattered static and global variables -- it's easier to
21 * view the state in a debugger, it makes clean shutdown simpler, we can
22 * trivially dump the state into a crash log, and it dodges most naming
23 * collisions that will arise when we are embedded in a larger program.
24 *
25 * If we want multiple VMs per process, this can get stuffed into TLS (or
26 * accessed through a Thread field).  May need to pass it around for some
27 * of the early initialization functions.
28 */
29#ifndef DALVIK_GLOBALS_H_
30#define DALVIK_GLOBALS_H_
31
32#include <string>
33#include <vector>
34
35#include <stdarg.h>
36#include <pthread.h>
37
38/* private structures */
39struct GcHeap;
40struct BreakpointSet;
41struct InlineSub;
42
43/*
44 * One of these for each -ea/-da/-esa/-dsa on the command line.
45 */
46struct AssertionControl {
47    char*   pkgOrClass;         /* package/class string, or NULL for esa/dsa */
48    int     pkgOrClassLen;      /* string length, for quick compare */
49    bool    enable;             /* enable or disable */
50    bool    isPackage;          /* string ended with "..."? */
51};
52
53/*
54 * Register map generation mode.  Only applicable when generateRegisterMaps
55 * is enabled.  (The "disabled" state is not folded into this because
56 * there are callers like dexopt that want to enable/disable without
57 * specifying the configuration details.)
58 *
59 * "TypePrecise" is slower and requires additional storage for the register
60 * maps, but allows type-precise GC.  "LivePrecise" is even slower and
61 * requires additional heap during processing, but allows live-precise GC.
62 */
63enum RegisterMapMode {
64    kRegisterMapModeUnknown = 0,
65    kRegisterMapModeTypePrecise,
66    kRegisterMapModeLivePrecise
67};
68
69/*
70 * Profiler clock source.
71 */
72enum ProfilerClockSource {
73    kProfilerClockSourceThreadCpu,
74    kProfilerClockSourceWall,
75    kProfilerClockSourceDual,
76};
77
78/*
79 * All fields are initialized to zero.
80 *
81 * Storage allocated here must be freed by a subsystem shutdown function.
82 */
83struct DvmGlobals {
84    /*
85     * Some options from the command line or environment.
86     */
87    char*       bootClassPathStr;
88    char*       classPathStr;
89
90    size_t      heapStartingSize;
91    size_t      heapMaximumSize;
92    size_t      heapGrowthLimit;
93    bool        lowMemoryMode;
94    double      heapTargetUtilization;
95    size_t      heapMinFree;
96    size_t      heapMaxFree;
97    size_t      stackSize;
98    size_t      mainThreadStackSize;
99
100    bool        verboseGc;
101    bool        verboseJni;
102    bool        verboseClass;
103    bool        verboseShutdown;
104
105    bool        jdwpAllowed;        // debugging allowed for this process?
106    bool        jdwpConfigured;     // has debugging info been provided?
107    JdwpTransportType jdwpTransport;
108    bool        jdwpServer;
109    char*       jdwpHost;
110    int         jdwpPort;
111    bool        jdwpSuspend;
112
113    ProfilerClockSource profilerClockSource;
114
115    /*
116     * Lock profiling threshold value in milliseconds.  Acquires that
117     * exceed threshold are logged.  Acquires within the threshold are
118     * logged with a probability of $\frac{time}{threshold}$ .  If the
119     * threshold is unset no additional logging occurs.
120     */
121    u4          lockProfThreshold;
122
123    int         (*vfprintfHook)(FILE*, const char*, va_list);
124    void        (*exitHook)(int);
125    void        (*abortHook)(void);
126    bool        (*isSensitiveThreadHook)(void);
127
128    char*       jniTrace;
129    bool        reduceSignals;
130    bool        noQuitHandler;
131    bool        verifyDexChecksum;
132    char*       stackTraceFile;     // for SIGQUIT-inspired output
133
134    bool        logStdio;
135
136    DexOptimizerMode    dexOptMode;
137    DexClassVerifyMode  classVerifyMode;
138
139    bool        generateRegisterMaps;
140    RegisterMapMode     registerMapMode;
141
142    bool        monitorVerification;
143
144    bool        dexOptForSmp;
145
146    /*
147     * GC option flags.
148     */
149    bool        preciseGc;
150    bool        preVerify;
151    bool        postVerify;
152    bool        concurrentMarkSweep;
153    bool        verifyCardTable;
154    bool        disableExplicitGc;
155
156    int         assertionCtrlCount;
157    AssertionControl*   assertionCtrl;
158
159    ExecutionMode   executionMode;
160
161    bool        commonInit; /* whether common stubs are generated */
162    bool        constInit; /* whether global constants are initialized */
163
164    /*
165     * VM init management.
166     */
167    bool        initializing;
168    bool        optimizing;
169
170    /*
171     * java.lang.System properties set from the command line with -D.
172     * This is effectively a set, where later entries override earlier
173     * ones.
174     */
175    std::vector<std::string>* properties;
176
177    /*
178     * Where the VM goes to find system classes.
179     */
180    ClassPathEntry* bootClassPath;
181    /* used by the DEX optimizer to load classes from an unfinished DEX */
182    DvmDex*     bootClassPathOptExtra;
183    bool        optimizingBootstrapClass;
184
185    /*
186     * Loaded classes, hashed by class name.  Each entry is a ClassObject*,
187     * allocated in GC space.
188     */
189    HashTable*  loadedClasses;
190
191    /*
192     * Value for the next class serial number to be assigned.  This is
193     * incremented as we load classes.  Failed loads and races may result
194     * in some numbers being skipped, and the serial number is not
195     * guaranteed to start at 1, so the current value should not be used
196     * as a count of loaded classes.
197     */
198    volatile int classSerialNumber;
199
200    /*
201     * Classes with a low classSerialNumber are probably in the zygote, and
202     * their InitiatingLoaderList is not used, to promote sharing. The list is
203     * kept here instead.
204     */
205    InitiatingLoaderList* initiatingLoaderList;
206
207    /*
208     * Interned strings.
209     */
210
211    /* A mutex that guards access to the interned string tables. */
212    pthread_mutex_t internLock;
213
214    /* Hash table of strings interned by the user. */
215    HashTable*  internedStrings;
216
217    /* Hash table of strings interned by the class loader. */
218    HashTable*  literalStrings;
219
220    /*
221     * Classes constructed directly by the vm.
222     */
223
224    /* the class Class */
225    ClassObject* classJavaLangClass;
226
227    /* synthetic classes representing primitive types */
228    ClassObject* typeVoid;
229    ClassObject* typeBoolean;
230    ClassObject* typeByte;
231    ClassObject* typeShort;
232    ClassObject* typeChar;
233    ClassObject* typeInt;
234    ClassObject* typeLong;
235    ClassObject* typeFloat;
236    ClassObject* typeDouble;
237
238    /* synthetic classes for arrays of primitives */
239    ClassObject* classArrayBoolean;
240    ClassObject* classArrayByte;
241    ClassObject* classArrayShort;
242    ClassObject* classArrayChar;
243    ClassObject* classArrayInt;
244    ClassObject* classArrayLong;
245    ClassObject* classArrayFloat;
246    ClassObject* classArrayDouble;
247
248    /*
249     * Quick lookups for popular classes used internally.
250     */
251    ClassObject* classJavaLangClassArray;
252    ClassObject* classJavaLangClassLoader;
253    ClassObject* classJavaLangObject;
254    ClassObject* classJavaLangObjectArray;
255    ClassObject* classJavaLangString;
256    ClassObject* classJavaLangThread;
257    ClassObject* classJavaLangVMThread;
258    ClassObject* classJavaLangThreadGroup;
259    ClassObject* classJavaLangStackTraceElement;
260    ClassObject* classJavaLangStackTraceElementArray;
261    ClassObject* classJavaLangAnnotationAnnotationArray;
262    ClassObject* classJavaLangAnnotationAnnotationArrayArray;
263    ClassObject* classJavaLangReflectAccessibleObject;
264    ClassObject* classJavaLangReflectConstructor;
265    ClassObject* classJavaLangReflectConstructorArray;
266    ClassObject* classJavaLangReflectField;
267    ClassObject* classJavaLangReflectFieldArray;
268    ClassObject* classJavaLangReflectMethod;
269    ClassObject* classJavaLangReflectMethodArray;
270    ClassObject* classJavaLangReflectProxy;
271    ClassObject* classJavaLangSystem;
272    ClassObject* classJavaNioDirectByteBuffer;
273    ClassObject* classLibcoreReflectAnnotationFactory;
274    ClassObject* classLibcoreReflectAnnotationMember;
275    ClassObject* classLibcoreReflectAnnotationMemberArray;
276    ClassObject* classOrgApacheHarmonyDalvikDdmcChunk;
277    ClassObject* classOrgApacheHarmonyDalvikDdmcDdmServer;
278    ClassObject* classJavaLangRefFinalizerReference;
279
280    /*
281     * classes representing exception types. The names here don't include
282     * packages, just to keep the use sites a bit less verbose. All are
283     * in java.lang, except where noted.
284     */
285    ClassObject* exAbstractMethodError;
286    ClassObject* exArithmeticException;
287    ClassObject* exArrayIndexOutOfBoundsException;
288    ClassObject* exArrayStoreException;
289    ClassObject* exClassCastException;
290    ClassObject* exClassCircularityError;
291    ClassObject* exClassFormatError;
292    ClassObject* exClassNotFoundException;
293    ClassObject* exError;
294    ClassObject* exExceptionInInitializerError;
295    ClassObject* exFileNotFoundException; /* in java.io */
296    ClassObject* exIOException;           /* in java.io */
297    ClassObject* exIllegalAccessError;
298    ClassObject* exIllegalAccessException;
299    ClassObject* exIllegalArgumentException;
300    ClassObject* exIllegalMonitorStateException;
301    ClassObject* exIllegalStateException;
302    ClassObject* exIllegalThreadStateException;
303    ClassObject* exIncompatibleClassChangeError;
304    ClassObject* exInstantiationError;
305    ClassObject* exInstantiationException;
306    ClassObject* exInternalError;
307    ClassObject* exInterruptedException;
308    ClassObject* exLinkageError;
309    ClassObject* exNegativeArraySizeException;
310    ClassObject* exNoClassDefFoundError;
311    ClassObject* exNoSuchFieldError;
312    ClassObject* exNoSuchFieldException;
313    ClassObject* exNoSuchMethodError;
314    ClassObject* exNullPointerException;
315    ClassObject* exOutOfMemoryError;
316    ClassObject* exRuntimeException;
317    ClassObject* exStackOverflowError;
318    ClassObject* exStaleDexCacheError;    /* in dalvik.system */
319    ClassObject* exStringIndexOutOfBoundsException;
320    ClassObject* exThrowable;
321    ClassObject* exTypeNotPresentException;
322    ClassObject* exUnsatisfiedLinkError;
323    ClassObject* exUnsupportedOperationException;
324    ClassObject* exVerifyError;
325    ClassObject* exVirtualMachineError;
326
327    /* method offsets - Object */
328    int         voffJavaLangObject_equals;
329    int         voffJavaLangObject_hashCode;
330    int         voffJavaLangObject_toString;
331
332    /* field offsets - String */
333    int         offJavaLangString_value;
334    int         offJavaLangString_count;
335    int         offJavaLangString_offset;
336    int         offJavaLangString_hashCode;
337
338    /* field offsets - Thread */
339    int         offJavaLangThread_vmThread;
340    int         offJavaLangThread_group;
341    int         offJavaLangThread_daemon;
342    int         offJavaLangThread_name;
343    int         offJavaLangThread_priority;
344    int         offJavaLangThread_uncaughtHandler;
345    int         offJavaLangThread_contextClassLoader;
346
347    /* method offsets - Thread */
348    int         voffJavaLangThread_run;
349
350    /* field offsets - ThreadGroup */
351    int         offJavaLangThreadGroup_name;
352    int         offJavaLangThreadGroup_parent;
353
354    /* field offsets - VMThread */
355    int         offJavaLangVMThread_thread;
356    int         offJavaLangVMThread_vmData;
357
358    /* method offsets - ThreadGroup */
359    int         voffJavaLangThreadGroup_removeThread;
360
361    /* field offsets - Throwable */
362    int         offJavaLangThrowable_stackState;
363    int         offJavaLangThrowable_cause;
364
365    /* method offsets - ClassLoader */
366    int         voffJavaLangClassLoader_loadClass;
367
368    /* direct method pointers - ClassLoader */
369    Method*     methJavaLangClassLoader_getSystemClassLoader;
370
371    /* field offsets - java.lang.reflect.* */
372    int         offJavaLangReflectConstructor_slot;
373    int         offJavaLangReflectConstructor_declClass;
374    int         offJavaLangReflectField_slot;
375    int         offJavaLangReflectField_declClass;
376    int         offJavaLangReflectMethod_slot;
377    int         offJavaLangReflectMethod_declClass;
378
379    /* field offsets - java.lang.ref.Reference */
380    int         offJavaLangRefReference_referent;
381    int         offJavaLangRefReference_queue;
382    int         offJavaLangRefReference_queueNext;
383    int         offJavaLangRefReference_pendingNext;
384
385    /* field offsets - java.lang.ref.FinalizerReference */
386    int offJavaLangRefFinalizerReference_zombie;
387
388    /* method pointers - java.lang.ref.ReferenceQueue */
389    Method* methJavaLangRefReferenceQueueAdd;
390
391    /* method pointers - java.lang.ref.FinalizerReference */
392    Method* methJavaLangRefFinalizerReferenceAdd;
393
394    /* constructor method pointers; no vtable involved, so use Method* */
395    Method*     methJavaLangStackTraceElement_init;
396    Method*     methJavaLangReflectConstructor_init;
397    Method*     methJavaLangReflectField_init;
398    Method*     methJavaLangReflectMethod_init;
399    Method*     methOrgApacheHarmonyLangAnnotationAnnotationMember_init;
400
401    /* static method pointers - android.lang.annotation.* */
402    Method*
403        methOrgApacheHarmonyLangAnnotationAnnotationFactory_createAnnotation;
404
405    /* direct method pointers - java.lang.reflect.Proxy */
406    Method*     methJavaLangReflectProxy_constructorPrototype;
407
408    /* field offsets - java.lang.reflect.Proxy */
409    int         offJavaLangReflectProxy_h;
410
411    /* direct method pointer - java.lang.System.runFinalization */
412    Method*     methJavaLangSystem_runFinalization;
413
414    /* field offsets - java.io.FileDescriptor */
415    int         offJavaIoFileDescriptor_descriptor;
416
417    /* direct method pointers - dalvik.system.NativeStart */
418    Method*     methDalvikSystemNativeStart_main;
419    Method*     methDalvikSystemNativeStart_run;
420
421    /* assorted direct buffer helpers */
422    Method*     methJavaNioDirectByteBuffer_init;
423    int         offJavaNioBuffer_capacity;
424    int         offJavaNioBuffer_effectiveDirectAddress;
425
426    /* direct method pointers - org.apache.harmony.dalvik.ddmc.DdmServer */
427    Method*     methDalvikDdmcServer_dispatch;
428    Method*     methDalvikDdmcServer_broadcast;
429
430    /* field offsets - org.apache.harmony.dalvik.ddmc.Chunk */
431    int         offDalvikDdmcChunk_type;
432    int         offDalvikDdmcChunk_data;
433    int         offDalvikDdmcChunk_offset;
434    int         offDalvikDdmcChunk_length;
435
436    /*
437     * Thread list.  This always has at least one element in it (main),
438     * and main is always the first entry.
439     *
440     * The threadListLock is used for several things, including the thread
441     * start condition variable.  Generally speaking, you must hold the
442     * threadListLock when:
443     *  - adding/removing items from the list
444     *  - waiting on or signaling threadStartCond
445     *  - examining the Thread struct for another thread (this is to avoid
446     *    one thread freeing the Thread struct while another thread is
447     *    perusing it)
448     */
449    Thread*     threadList;
450    pthread_mutex_t threadListLock;
451
452    pthread_cond_t threadStartCond;
453
454    /*
455     * The thread code grabs this before suspending all threads.  There
456     * are a few things that can cause a "suspend all":
457     *  (1) the GC is starting;
458     *  (2) the debugger has sent a "suspend all" request;
459     *  (3) a thread has hit a breakpoint or exception that the debugger
460     *      has marked as a "suspend all" event;
461     *  (4) the SignalCatcher caught a signal that requires suspension.
462     *  (5) (if implemented) the JIT needs to perform a heavyweight
463     *      rearrangement of the translation cache or JitTable.
464     *
465     * Because we use "safe point" self-suspension, it is never safe to
466     * do a blocking "lock" call on this mutex -- if it has been acquired,
467     * somebody is probably trying to put you to sleep.  The leading '_' is
468     * intended as a reminder that this lock is special.
469     */
470    pthread_mutex_t _threadSuspendLock;
471
472    /*
473     * Guards Thread->suspendCount for all threads, and
474     * provides the lock for the condition variable that all suspended threads
475     * sleep on (threadSuspendCountCond).
476     *
477     * This has to be separate from threadListLock because of the way
478     * threads put themselves to sleep.
479     */
480    pthread_mutex_t threadSuspendCountLock;
481
482    /*
483     * Suspended threads sleep on this.  They should sleep on the condition
484     * variable until their "suspend count" is zero.
485     *
486     * Paired with "threadSuspendCountLock".
487     */
488    pthread_cond_t  threadSuspendCountCond;
489
490    /*
491     * Sum of all threads' suspendCount fields. Guarded by
492     * threadSuspendCountLock.
493     */
494    int  sumThreadSuspendCount;
495
496    /*
497     * MUTEX ORDERING: when locking multiple mutexes, always grab them in
498     * this order to avoid deadlock:
499     *
500     *  (1) _threadSuspendLock      (use lockThreadSuspend())
501     *  (2) threadListLock          (use dvmLockThreadList())
502     *  (3) threadSuspendCountLock  (use lockThreadSuspendCount())
503     */
504
505
506    /*
507     * Thread ID bitmap.  We want threads to have small integer IDs so
508     * we can use them in "thin locks".
509     */
510    BitVector*  threadIdMap;
511
512    /*
513     * Manage exit conditions.  The VM exits when all non-daemon threads
514     * have exited.  If the main thread returns early, we need to sleep
515     * on a condition variable.
516     */
517    int         nonDaemonThreadCount;   /* must hold threadListLock to access */
518    pthread_cond_t  vmExitCond;
519
520    /*
521     * The set of DEX files loaded by custom class loaders.
522     */
523    HashTable*  userDexFiles;
524
525    /*
526     * JNI global reference table.
527     */
528    IndirectRefTable jniGlobalRefTable;
529    IndirectRefTable jniWeakGlobalRefTable;
530    pthread_mutex_t jniGlobalRefLock;
531    pthread_mutex_t jniWeakGlobalRefLock;
532
533    /*
534     * JNI pinned object table (used for primitive arrays).
535     */
536    ReferenceTable  jniPinRefTable;
537    pthread_mutex_t jniPinRefLock;
538
539    /*
540     * Native shared library table.
541     */
542    HashTable*  nativeLibs;
543
544    /*
545     * GC heap lock.  Functions like gcMalloc() acquire this before making
546     * any changes to the heap.  It is held throughout garbage collection.
547     */
548    pthread_mutex_t gcHeapLock;
549
550    /*
551     * Condition variable to queue threads waiting to retry an
552     * allocation.  Signaled after a concurrent GC is completed.
553     */
554    pthread_cond_t gcHeapCond;
555
556    /* Opaque pointer representing the heap. */
557    GcHeap*     gcHeap;
558
559    /* The card table base, modified as needed for marking cards. */
560    u1*         biasedCardTableBase;
561
562    /*
563     * Pre-allocated throwables.
564     */
565    Object*     outOfMemoryObj;
566    Object*     internalErrorObj;
567    Object*     noClassDefFoundErrorObj;
568
569    /* Monitor list, so we can free them */
570    /*volatile*/ Monitor* monitorList;
571
572    /* Monitor for Thread.sleep() implementation */
573    Monitor*    threadSleepMon;
574
575    /* set when we create a second heap inside the zygote */
576    bool        newZygoteHeapAllocated;
577
578    /*
579     * TLS keys.
580     */
581    pthread_key_t pthreadKeySelf;       /* Thread*, for dvmThreadSelf */
582
583    /*
584     * Cache results of "A instanceof B".
585     */
586    AtomicCache* instanceofCache;
587
588    /* inline substitution table, used during optimization */
589    InlineSub*          inlineSubs;
590
591    /*
592     * Bootstrap class loader linear allocator.
593     */
594    LinearAllocHdr* pBootLoaderAlloc;
595
596    /*
597     * Compute some stats on loaded classes.
598     */
599    int         numLoadedClasses;
600    int         numDeclaredMethods;
601    int         numDeclaredInstFields;
602    int         numDeclaredStaticFields;
603
604    /* when using a native debugger, set this to suppress watchdog timers */
605    bool        nativeDebuggerActive;
606
607    /*
608     * JDWP debugger support.
609     *
610     * Note: Each thread will normally determine whether the debugger is active
611     * for it by referring to its subMode flags.  "debuggerActive" here should be
612     * seen as "debugger is making requests of 1 or more threads".
613     */
614    bool        debuggerConnected;      /* debugger or DDMS is connected */
615    bool        debuggerActive;         /* debugger is making requests */
616    JdwpState*  jdwpState;
617
618    /*
619     * Registry of objects known to the debugger.
620     */
621    HashTable*  dbgRegistry;
622
623    /*
624     * Debugger breakpoint table.
625     */
626    BreakpointSet*  breakpointSet;
627
628    /*
629     * Single-step control struct.  We currently only allow one thread to
630     * be single-stepping at a time, which is all that really makes sense,
631     * but it's possible we may need to expand this to be per-thread.
632     */
633    StepControl stepControl;
634
635    /*
636     * DDM features embedded in the VM.
637     */
638    bool        ddmThreadNotification;
639
640    /*
641     * Zygote (partially-started process) support
642     */
643    bool        zygote;
644
645    /*
646     * Used for tracking allocations that we report to DDMS.  When the feature
647     * is enabled (through a DDMS request) the "allocRecords" pointer becomes
648     * non-NULL.
649     */
650    pthread_mutex_t allocTrackerLock;
651    AllocRecord*    allocRecords;
652    int             allocRecordHead;        /* most-recently-added entry */
653    int             allocRecordCount;       /* #of valid entries */
654    int             allocRecordMax;         /* Number of allocated entries. */
655
656    /*
657     * When a profiler is enabled, this is incremented.  Distinct profilers
658     * include "dmtrace" method tracing, emulator method tracing, and
659     * possibly instruction counting.
660     *
661     * The purpose of this is to have a single value that shows whether any
662     * profiling is going on.  Individual thread will normally check their
663     * thread-private subMode flags to take any profiling action.
664     */
665    volatile int activeProfilers;
666
667    /*
668     * State for method-trace profiling.
669     */
670    MethodTraceState methodTrace;
671    Method*     methodTraceGcMethod;
672    Method*     methodTraceClassPrepMethod;
673
674    /*
675     * State for emulator tracing.
676     */
677    void*       emulatorTracePage;
678    int         emulatorTraceEnableCount;
679
680    /*
681     * Global state for memory allocation profiling.
682     */
683    AllocProfState allocProf;
684
685    /*
686     * Pointers to the original methods for things that have been inlined.
687     * This makes it easy for us to output method entry/exit records for
688     * the method calls we're not actually making.  (Used by method
689     * profiling.)
690     */
691    Method**    inlinedMethods;
692
693    /*
694     * Dalvik instruction counts (kNumPackedOpcodes entries).
695     */
696    int*        executedInstrCounts;
697    int         instructionCountEnableCount;
698
699    /*
700     * Signal catcher thread (for SIGQUIT).
701     */
702    pthread_t   signalCatcherHandle;
703    bool        haltSignalCatcher;
704
705    /*
706     * Stdout/stderr conversion thread.
707     */
708    bool            haltStdioConverter;
709    bool            stdioConverterReady;
710    pthread_t       stdioConverterHandle;
711    pthread_mutex_t stdioConverterLock;
712    pthread_cond_t  stdioConverterCond;
713    int             stdoutPipe[2];
714    int             stderrPipe[2];
715
716    /*
717     * pid of the system_server process. We track it so that when system server
718     * crashes the Zygote process will be killed and restarted.
719     */
720    pid_t systemServerPid;
721
722    int kernelGroupScheduling;
723
724//#define COUNT_PRECISE_METHODS
725#ifdef COUNT_PRECISE_METHODS
726    PointerSet* preciseMethods;
727#endif
728
729    /* some RegisterMap statistics, useful during development */
730    void*       registerMapStats;
731
732#ifdef VERIFIER_STATS
733    VerifierStats verifierStats;
734#endif
735
736    /* String pointed here will be deposited on the stack frame of dvmAbort */
737    const char *lastMessage;
738};
739
740extern struct DvmGlobals gDvm;
741
742#if defined(WITH_JIT)
743
744#define DEFAULT_CODE_CACHE_SIZE 0xffffffff
745
746/* Trace profiling modes.  Ordering matters - off states before on states */
747enum TraceProfilingModes {
748    kTraceProfilingDisabled = 0,      // Not profiling
749    kTraceProfilingPeriodicOff = 1,   // Periodic profiling, off phase
750    kTraceProfilingContinuous = 2,    // Always profiling
751    kTraceProfilingPeriodicOn = 3     // Periodic profiling, on phase
752};
753
754/*
755 * Exiting the compiled code w/o chaining will incur overhead to look up the
756 * target in the code cache which is extra work only when JIT is enabled. So
757 * we want to monitor it closely to make sure we don't have performance bugs.
758 */
759enum NoChainExits {
760    kInlineCacheMiss = 0,
761    kCallsiteInterpreted,
762    kSwitchOverflow,
763    kHeavyweightMonitor,
764    kNoChainExitLast,
765};
766
767/*
768 * JIT-specific global state
769 */
770struct DvmJitGlobals {
771    /*
772     * Guards writes to Dalvik PC (dPC), translated code address (codeAddr) and
773     * chain fields within the JIT hash table.  Note carefully the access
774     * mechanism.
775     * Only writes are guarded, and the guarded fields must be updated in a
776     * specific order using atomic operations.  Further, once a field is
777     * written it cannot be changed without halting all threads.
778     *
779     * The write order is:
780     *    1) codeAddr
781     *    2) dPC
782     *    3) chain [if necessary]
783     *
784     * This mutex also guards both read and write of curJitTableEntries.
785     */
786    pthread_mutex_t tableLock;
787
788    /* The JIT hash table.  Note that for access speed, copies of this pointer
789     * are stored in each thread. */
790    struct JitEntry *pJitEntryTable;
791
792    /* Array of compilation trigger threshold counters */
793    unsigned char *pProfTable;
794
795    /* Trace profiling counters */
796    struct JitTraceProfCounters *pJitTraceProfCounters;
797
798    /* Copy of pProfTable used for temporarily disabling the Jit */
799    unsigned char *pProfTableCopy;
800
801    /* Size of JIT hash table in entries.  Must be a power of 2 */
802    unsigned int jitTableSize;
803
804    /* Mask used in hash function for JitTable.  Should be jitTableSize-1 */
805    unsigned int jitTableMask;
806
807    /* How many entries in the JitEntryTable are in use */
808    unsigned int jitTableEntriesUsed;
809
810    /* Max bytes allocated for the code cache.  Rough rule of thumb: 1K per 1M of system RAM */
811    unsigned int codeCacheSize;
812
813    /* Trigger for trace selection */
814    unsigned short threshold;
815
816    /* JIT Compiler Control */
817    bool               haltCompilerThread;
818    bool               blockingMode;
819    bool               methodTraceSupport;
820    bool               genSuspendPoll;
821    Thread*            compilerThread;
822    pthread_t          compilerHandle;
823    pthread_mutex_t    compilerLock;
824    pthread_mutex_t    compilerICPatchLock;
825    pthread_cond_t     compilerQueueActivity;
826    pthread_cond_t     compilerQueueEmpty;
827    volatile int       compilerQueueLength;
828    int                compilerHighWater;
829    int                compilerWorkEnqueueIndex;
830    int                compilerWorkDequeueIndex;
831    int                compilerICPatchIndex;
832
833    /* JIT internal stats */
834    int                compilerMaxQueued;
835    int                translationChains;
836
837    /* Compiled code cache */
838    void* codeCache;
839
840    /*
841     * This is used to store the base address of an in-flight compilation whose
842     * class object pointers have been calculated to populate literal pool.
843     * Once the compiler thread has changed its status to VM_WAIT, we cannot
844     * guarantee whether GC has happened before the code address has been
845     * installed to the JIT table. Because of that, this field can only
846     * been cleared/overwritten by the compiler thread if it is in the
847     * THREAD_RUNNING state or in a safe point.
848     */
849    void *inflightBaseAddr;
850
851    /* Translation cache version (protected by compilerLock */
852    int cacheVersion;
853
854    /* Bytes used by the code templates */
855    unsigned int templateSize;
856
857    /* Bytes already used in the code cache */
858    unsigned int codeCacheByteUsed;
859
860    /* Number of installed compilations in the cache */
861    unsigned int numCompilations;
862
863    /* Flag to indicate that the code cache is full */
864    bool codeCacheFull;
865
866    /* Page size  - 1 */
867    unsigned int pageSizeMask;
868
869    /* Lock to change the protection type of the code cache */
870    pthread_mutex_t    codeCacheProtectionLock;
871
872    /* Number of times that the code cache has been reset */
873    int numCodeCacheReset;
874
875    /* Number of times that the code cache reset request has been delayed */
876    int numCodeCacheResetDelayed;
877
878    /* true/false: compile/reject opcodes specified in the -Xjitop list */
879    bool includeSelectedOp;
880
881    /* true/false: compile/reject methods specified in the -Xjitmethod list */
882    bool includeSelectedMethod;
883
884    /* true/false: compile/reject traces with offset specified in the -Xjitoffset list */
885    bool includeSelectedOffset;
886
887    /* Disable JIT for selected opcodes - one bit for each opcode */
888    char opList[(kNumPackedOpcodes+7)/8];
889
890    /* Disable JIT for selected methods */
891    HashTable *methodTable;
892
893    /* Disable JIT for selected classes */
894    HashTable *classTable;
895
896    /* Disable JIT for selected offsets */
897    unsigned int pcTable[COMPILER_PC_OFFSET_SIZE];
898    int num_entries_pcTable;
899
900    /* Flag to dump all compiled code */
901    bool printMe;
902
903    /* Flag to dump compiled binary code in bytes */
904    bool printBinary;
905
906    /* Per-process debug flag toggled when receiving a SIGUSR2 */
907    bool receivedSIGUSR2;
908
909    /* Trace profiling mode */
910    TraceProfilingModes profileMode;
911
912    /* Periodic trace profiling countdown timer */
913    int profileCountdown;
914
915    /* Vector to disable selected optimizations */
916    int disableOpt;
917
918    /* Table to track the overall and trace statistics of hot methods */
919    HashTable*  methodStatsTable;
920
921    /* Filter method compilation blacklist with call-graph information */
922    bool checkCallGraph;
923
924    /* New translation chain has been set up */
925    volatile bool hasNewChain;
926
927#if defined(WITH_SELF_VERIFICATION)
928    /* Spin when error is detected, volatile so GDB can reset it */
929    volatile bool selfVerificationSpin;
930#endif
931
932    /* Framework or stand-alone? */
933    bool runningInAndroidFramework;
934
935    /* Framework callback happened? */
936    bool alreadyEnabledViaFramework;
937
938    /* Framework requests to disable the JIT for good */
939    bool disableJit;
940
941#if defined(SIGNATURE_BREAKPOINT)
942    /* Signature breakpoint */
943    u4 signatureBreakpointSize;         // # of words
944    u4 *signatureBreakpoint;            // Signature content
945#endif
946
947#if defined(WITH_JIT_TUNING)
948    /* Performance tuning counters */
949    int                addrLookupsFound;
950    int                addrLookupsNotFound;
951    int                noChainExit[kNoChainExitLast];
952    int                normalExit;
953    int                puntExit;
954    int                invokeMonomorphic;
955    int                invokePolymorphic;
956    int                invokeNative;
957    int                invokeMonoGetterInlined;
958    int                invokeMonoSetterInlined;
959    int                invokePolyGetterInlined;
960    int                invokePolySetterInlined;
961    int                returnOp;
962    int                icPatchInit;
963    int                icPatchLockFree;
964    int                icPatchQueued;
965    int                icPatchRejected;
966    int                icPatchDropped;
967    int                codeCachePatches;
968    int                numCompilerThreadBlockGC;
969    u8                 jitTime;
970    u8                 compilerThreadBlockGCStart;
971    u8                 compilerThreadBlockGCTime;
972    u8                 maxCompilerThreadBlockGCTime;
973#endif
974
975#if defined(ARCH_IA32)
976    JitOptLevel        optLevel;
977#endif
978
979    /* Place arrays at the end to ease the display in gdb sessions */
980
981    /* Work order queue for compilations */
982    CompilerWorkOrder compilerWorkQueue[COMPILER_WORK_QUEUE_SIZE];
983
984    /* Work order queue for predicted chain patching */
985    ICPatchWorkOrder compilerICPatchQueue[COMPILER_IC_PATCH_QUEUE_SIZE];
986};
987
988extern struct DvmJitGlobals gDvmJit;
989
990#if defined(WITH_JIT_TUNING)
991extern int gDvmICHitCount;
992#endif
993
994#endif
995
996struct DvmJniGlobals {
997    bool useCheckJni;
998    bool warnOnly;
999    bool forceCopy;
1000
1001    // Provide backwards compatibility for pre-ICS apps on ICS.
1002    bool workAroundAppJniBugs;
1003
1004    // Debugging help for third-party developers. Similar to -Xjnitrace.
1005    bool logThirdPartyJni;
1006
1007    // We only support a single JavaVM per process.
1008    JavaVM*     jniVm;
1009};
1010
1011extern struct DvmJniGlobals gDvmJni;
1012
1013#endif  // DALVIK_GLOBALS_H_
1014