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use a reference to a byte array in the java heap (locking down the

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object) rather than allocating a new array in the C heap -- for the
DAWG data of a dictionary.  This can use up to 5% of the java heap for
huge dictionaries, but I'm hoping it fixes a problem reported by a
user of the large German dictionary that seems to involve allocation.
If I'm reading correctly, as long as I stay within 16M (24M or more on
newer devices) I'm sure to get my memory in the java world while it's
less a sure thing in the JNI world (where in addition linux's
aggressive overallocation is used, meaning I'll fail when I try to
swap in memory on write rather than get back NULL from malloc.)
This commit is contained in:
Andy2 2011-01-31 18:55:44 -08:00
parent 49cdb7e629
commit b722cc5f65
1 changed files with 18 additions and 22 deletions
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40
xwords4/android/XWords4/jni/anddict.c
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@ -34,7 +34,8 @@ typedef struct _AndDictionaryCtxt {
DictionaryCtxt super;
JNIUtilCtxt* jniutil;
JNIEnv *env;
XP_U8* bytes;
jbyte* bytes;
jbyteArray byteArray;
} AndDictionaryCtxt;
static void splitFaces_via_java( JNIEnv* env, AndDictionaryCtxt* ctxt,
@ -51,7 +52,7 @@ dict_splitFaces( DictionaryCtxt* dict, const XP_U8* bytes,
}
static XP_U32
n_ptr_tohl( XP_U8** inp )
n_ptr_tohl( XP_U8 const** inp )
{
XP_U32 t;
XP_MEMCPY( &t, *inp, sizeof(t) );
@ -62,7 +63,7 @@ n_ptr_tohl( XP_U8** inp )
} /* n_ptr_tohl */
static XP_U16
n_ptr_tohs( XP_U8** inp )
n_ptr_tohs( XP_U8 const ** inp )
{
XP_U16 t;
XP_MEMCPY( &t, *inp, sizeof(t) );
@ -88,9 +89,9 @@ andCountSpecials( AndDictionaryCtxt* ctxt )
} /* andCountSpecials */
static XP_Bitmap
andMakeBitmap( AndDictionaryCtxt* ctxt, XP_U8** ptrp )
andMakeBitmap( AndDictionaryCtxt* ctxt, XP_U8 const** ptrp )
{
XP_U8* ptr = *ptrp;
XP_U8 const* ptr = *ptrp;
XP_U8 nCols = *ptr++;
jobject bitmap = NULL;
@ -134,10 +135,10 @@ andMakeBitmap( AndDictionaryCtxt* ctxt, XP_U8** ptrp )
} /* andMakeBitmap */
static void
andLoadSpecialData( AndDictionaryCtxt* ctxt, XP_U8** ptrp )
andLoadSpecialData( AndDictionaryCtxt* ctxt, XP_U8 const** ptrp )
{
XP_U16 nSpecials = andCountSpecials( ctxt );
XP_U8* ptr = *ptrp;
XP_U8 const* ptr = *ptrp;
Tile ii;
XP_UCHAR** texts;
SpecialBitmaps* bitmaps;
@ -230,7 +231,7 @@ splitFaces_via_java( JNIEnv* env, AndDictionaryCtxt* ctxt, const XP_U8* ptr,
} /* splitFaces_via_java */
static void
parseDict( AndDictionaryCtxt* ctxt, XP_U8* ptr, XP_U32 dictLength )
parseDict( AndDictionaryCtxt* ctxt, XP_U8 const* ptr, XP_U32 dictLength )
{
while( !!ptr ) { /* lets us break.... */
XP_U32 offset;
@ -363,6 +364,7 @@ and_dictionary_destroy( DictionaryCtxt* dict )
AndDictionaryCtxt* ctxt = (AndDictionaryCtxt*)dict;
XP_U16 nSpecials = andCountSpecials( ctxt );
XP_U16 ii;
JNIEnv* env = ctxt->env;
if ( !!ctxt->super.chars ) {
for ( ii = 0; ii < nSpecials; ++ii ) {
@ -374,7 +376,6 @@ and_dictionary_destroy( DictionaryCtxt* dict )
XP_FREE( ctxt->super.mpool, ctxt->super.chars );
}
if ( !!ctxt->super.bitmaps ) {
JNIEnv* env = ctxt->env;
for ( ii = 0; ii < nSpecials; ++ii ) {
jobject bitmap = ctxt->super.bitmaps[ii].largeBM;
if ( !!bitmap ) {
@ -391,7 +392,8 @@ and_dictionary_destroy( DictionaryCtxt* dict )
XP_FREE( ctxt->super.mpool, ctxt->super.name );
}
XP_FREE( ctxt->super.mpool, ctxt->bytes );
(*env)->ReleaseByteArrayElements( env, ctxt->byteArray, ctxt->bytes, 0 );
(*env)->DeleteGlobalRef( env, ctxt->byteArray );
XP_FREE( ctxt->super.mpool, ctxt );
}
@ -424,23 +426,17 @@ DictionaryCtxt*
makeDict( MPFORMAL JNIEnv *env, JNIUtilCtxt* jniutil, jbyteArray jbytes,
jstring jname )
{
AndDictionaryCtxt* anddict = NULL;
AndDictionaryCtxt* anddict = (AndDictionaryCtxt*)
and_dictionary_make_empty( MPPARM(mpool) env, jniutil );
jsize len = (*env)->GetArrayLength( env, jbytes );
anddict->byteArray = (*env)->NewGlobalRef( env, jbytes );
anddict->bytes = (*env)->GetByteArrayElements( env, anddict->byteArray,
NULL );
XP_U8* localBytes = XP_MALLOC( mpool, len );
jbyte* src = (*env)->GetByteArrayElements( env, jbytes, NULL );
XP_MEMCPY( localBytes, src, len );
(*env)->ReleaseByteArrayElements( env, jbytes, src, 0 );
anddict = (AndDictionaryCtxt*)
and_dictionary_make_empty( MPPARM(mpool) env, jniutil );
anddict->super.destructor = and_dictionary_destroy;
/* anddict->super.func_dict_getShortName = and_dict_getShortName; */
anddict->bytes = localBytes;
parseDict( anddict, localBytes, len );
parseDict( anddict, (XP_U8*)anddict->bytes, len );
/* copy the name */
if ( NULL != jname ) {