/*
* Resolve a string reference.
*
* Finding the string is easy. We need to return a reference to a
* java/lang/String object, not a bunch of characters, which means the
* first time we get here we need to create an interned string.
*/
StringObject* dvmResolveString(const ClassObject* referrer, u4 stringIdx)
{
DvmDex* pDvmDex = referrer->pDvmDex;
StringObject* strObj;
StringObject* internStrObj;
const char* utf8;
u4 utf16Size;
LOGVV("+++ resolving string, referrer is %s\n", referrer->descriptor);
/*
* Create a UTF-16 version so we can trivially compare it to what's
* already interned.
*/
utf8 = dexStringAndSizeById(pDvmDex->pDexFile, stringIdx, &utf16Size);
strObj = dvmCreateStringFromCstrAndLength(utf8, utf16Size,
ALLOC_DEFAULT);
if (strObj == NULL) {
/* ran out of space in GC heap? */
assert(dvmCheckException(dvmThreadSelf()));
goto bail;
}
/*
* Add it to the intern list. The return value is the one in the
* intern list, which (due to race conditions) may or may not be
* the one we just created. The intern list is synchronized, so
* there will be only one "live" version.
*
* By requesting an immortal interned string, we guarantee that
* the returned object will never be collected by the GC.
*
* A NULL return here indicates some sort of hashing failure.
*/
internStrObj = dvmLookupImmortalInternedString(strObj);
dvmReleaseTrackedAlloc((Object*) strObj, NULL);
strObj = internStrObj;
if (strObj == NULL) {
assert(dvmCheckException(dvmThreadSelf()));
goto bail;
}
/* save a reference so we can go straight to the object next time */
dvmDexSetResolvedString(pDvmDex, stringIdx, strObj);
bail:
return strObj;
}
// Based on dvmResolveString.
static void preloadDexCachesResolveString(DvmDex* pDvmDex,
uint32_t stringIdx,
StringTable& strings) {
StringObject* string = dvmDexGetResolvedString(pDvmDex, stringIdx);
if (string != NULL) {
return;
}
const DexFile* pDexFile = pDvmDex->pDexFile;
uint32_t utf16Size;
const char* utf8 = dexStringAndSizeById(pDexFile, stringIdx, &utf16Size);
string = strings[utf8];
if (string == NULL) {
return;
}
// ALOGI("VMRuntime.preloadDexCaches found string=%s", utf8);
dvmDexSetResolvedString(pDvmDex, stringIdx, string);
}
