// Based on dvmResolveInstField/dvmResolveStaticField.
static void preloadDexCachesResolveField(DvmDex* pDvmDex, uint32_t fieldIdx, bool instance) {
Field* field = dvmDexGetResolvedField(pDvmDex, fieldIdx);
if (field != NULL) {
return;
}
const DexFile* pDexFile = pDvmDex->pDexFile;
const DexFieldId* pFieldId = dexGetFieldId(pDexFile, fieldIdx);
ClassObject* clazz = dvmDexGetResolvedClass(pDvmDex, pFieldId->classIdx);
if (clazz == NULL) {
return;
}
// Skip static fields for uninitialized classes because a filled
// cache entry implies the class is initialized.
if (!instance && !dvmIsClassInitialized(clazz)) {
return;
}
const char* fieldName = dexStringById(pDexFile, pFieldId->nameIdx);
const char* signature = dexStringByTypeIdx(pDexFile, pFieldId->typeIdx);
if (instance) {
field = dvmFindInstanceFieldHier(clazz, fieldName, signature);
} else {
field = dvmFindStaticFieldHier(clazz, fieldName, signature);
}
if (field == NULL) {
return;
}
// ALOGI("VMRuntime.preloadDexCaches found field %s %s.%s",
// signature, clazz->descriptor, fieldName);
dvmDexSetResolvedField(pDvmDex, fieldIdx, field);
}
/*
* Resolve a static field reference. The DexFile format doesn't distinguish
* between static and instance field references, so the "resolved" pointer
* in the Dex struct will have the wrong type. We trivially cast it here.
*
* Causes the field's class to be initialized.
*/
StaticField* dvmResolveStaticField(const ClassObject* referrer, u4 sfieldIdx)
{
DvmDex* pDvmDex = referrer->pDvmDex;
ClassObject* resClass;
const DexFieldId* pFieldId;
StaticField* resField;
pFieldId = dexGetFieldId(pDvmDex->pDexFile, sfieldIdx);
/*
* Find the field's class.
*/
resClass = dvmResolveClass(referrer, pFieldId->classIdx, false);
if (resClass == NULL) {
assert(dvmCheckException(dvmThreadSelf()));
return NULL;
}
resField = dvmFindStaticFieldHier(resClass,
dexStringById(pDvmDex->pDexFile, pFieldId->nameIdx),
dexStringByTypeIdx(pDvmDex->pDexFile, pFieldId->typeIdx));
if (resField == NULL) {
dvmThrowNoSuchFieldError(
dexStringById(pDvmDex->pDexFile, pFieldId->nameIdx));
return NULL;
}
/*
* If we're the first to resolve the field in which this class resides,
* we need to do it now. Note that, if the field was inherited from
* a superclass, it is not necessarily the same as "resClass".
*/
if (!dvmIsClassInitialized(resField->clazz) &&
!dvmInitClass(resField->clazz))
{
assert(dvmCheckException(dvmThreadSelf()));
return NULL;
}
/*
* If the class has been initialized, add a pointer to our data structure
* so we don't have to jump through the hoops again. If it's still
* initializing (i.e. this thread is executing <clinit>), don't do
* the store, otherwise other threads could use the field without waiting
* for class init to finish.
*/
if (dvmIsClassInitialized(resField->clazz)) {
dvmDexSetResolvedField(pDvmDex, sfieldIdx, (Field*) resField);
} else {
LOGVV("--- not caching resolved field %s.%s (class init=%d/%d)",
resField->clazz->descriptor, resField->name,
dvmIsClassInitializing(resField->clazz),
dvmIsClassInitialized(resField->clazz));
}
return resField;
}
/*
* Resolve an instance field reference.
*
* Returns NULL and throws an exception on error (no such field, illegal
* access).
*/
InstField* dvmResolveInstField(const ClassObject* referrer, u4 ifieldIdx)
{
DvmDex* pDvmDex = referrer->pDvmDex;
ClassObject* resClass;
const DexFieldId* pFieldId;
InstField* resField;
LOGVV("--- resolving field %u (referrer=%s cl=%p)",
ifieldIdx, referrer->descriptor, referrer->classLoader);
pFieldId = dexGetFieldId(pDvmDex->pDexFile, ifieldIdx);
/*
* Find the field's class.
*/
resClass = dvmResolveClass(referrer, pFieldId->classIdx, false);
if (resClass == NULL) {
assert(dvmCheckException(dvmThreadSelf()));
return NULL;
}
resField = dvmFindInstanceFieldHier(resClass,
dexStringById(pDvmDex->pDexFile, pFieldId->nameIdx),
dexStringByTypeIdx(pDvmDex->pDexFile, pFieldId->typeIdx));
if (resField == NULL) {
dvmThrowNoSuchFieldError(
dexStringById(pDvmDex->pDexFile, pFieldId->nameIdx));
return NULL;
}
/*
* Class must be initialized by now (unless verifier is buggy). We
* could still be in the process of initializing it if the field
* access is from a static initializer.
*/
assert(dvmIsClassInitialized(resField->clazz) ||
dvmIsClassInitializing(resField->clazz));
/*
* The class is initialized (or initializing), the field has been
* found. Add a pointer to our data structure so we don't have to
* jump through the hoops again.
*
* Anything that uses the resolved table entry must have an instance
* of the class, so any class init activity has already happened (or
* been deliberately bypassed when <clinit> created an instance).
* So it's always okay to update the table.
*/
dvmDexSetResolvedField(pDvmDex, ifieldIdx, (Field*)resField);
LOGVV(" field %u is %s.%s",
ifieldIdx, resField->clazz->descriptor, resField->name);
return resField;
}
/*
* Resolve an instance field reference.
*
* Returns NULL and throws an exception on error (no such field, illegal
* access).
*/
InstField* dvmResolveInstField(const ClassObject* referrer, u4 ifieldIdx)
{
DvmDex* pDvmDex = referrer->pDvmDex;
ClassObject* resClass;
const DexFieldId* pFieldId;
InstField* resField;
LOGVV("--- resolving field %u (referrer=%s cl=%p)\n",
ifieldIdx, referrer->descriptor, referrer->classLoader);
pFieldId = dexGetFieldId(pDvmDex->pDexFile, ifieldIdx);
/*
* Find the field's class.
*/
resClass = dvmResolveClass(referrer, pFieldId->classIdx, false);
if (resClass == NULL) {
assert(dvmCheckException(dvmThreadSelf()));
return NULL;
}
resField = dvmFindInstanceFieldHier(resClass,
dexStringById(pDvmDex->pDexFile, pFieldId->nameIdx),
dexStringByTypeIdx(pDvmDex->pDexFile, pFieldId->typeIdx));
if (resField == NULL) {
dvmThrowException("Ljava/lang/NoSuchFieldError;",
dexStringById(pDvmDex->pDexFile, pFieldId->nameIdx));
return NULL;
}
/*
* Class must be initialized by now (unless verifier is buggy). We
* could still be in the process of initializing it if the field
* access is from a static initializer.
*/
assert(dvmIsClassInitialized(resField->field.clazz) ||
dvmIsClassInitializing(resField->field.clazz));
/*
* The class is initialized, the method has been found. Add a pointer
* to our data structure so we don't have to jump through the hoops again.
*/
dvmDexSetResolvedField(pDvmDex, ifieldIdx, (Field*)resField);
LOGVV(" field %u is %s.%s\n",
ifieldIdx, resField->field.clazz->descriptor, resField->field.name);
return resField;
}
/*
* Resolve a static field reference. The DexFile format doesn't distinguish
* between static and instance field references, so the "resolved" pointer
* in the Dex struct will have the wrong type. We trivially cast it here.
*
* Causes the field's class to be initialized.
*/
StaticField* dvmResolveStaticField(const ClassObject* referrer, u4 sfieldIdx)
{
DvmDex* pDvmDex = referrer->pDvmDex;
ClassObject* resClass;
const DexFieldId* pFieldId;
StaticField* resField;
pFieldId = dexGetFieldId(pDvmDex->pDexFile, sfieldIdx);
/*
* Find the field's class.
*/
resClass = dvmResolveClass(referrer, pFieldId->classIdx, false);
if (resClass == NULL) {
assert(dvmCheckException(dvmThreadSelf()));
return NULL;
}
resField = dvmFindStaticFieldHier(resClass,
dexStringById(pDvmDex->pDexFile, pFieldId->nameIdx),
dexStringByTypeIdx(pDvmDex->pDexFile, pFieldId->typeIdx));
if (resField == NULL) {
dvmThrowException("Ljava/lang/NoSuchFieldError;",
dexStringById(pDvmDex->pDexFile, pFieldId->nameIdx));
return NULL;
}
/*
* If we're the first to resolve the field in which this class resides,
* we need to do it now. Note that, if the field was inherited from
* a superclass, it is not necessarily the same as "resClass".
*/
if (!dvmIsClassInitialized(resField->field.clazz) &&
!dvmInitClass(resField->field.clazz))
{
assert(dvmCheckException(dvmThreadSelf()));
return NULL;
}
/*
* The class is initialized, the method has been found. Add a pointer
* to our data structure so we don't have to jump through the hoops again.
*/
dvmDexSetResolvedField(pDvmDex, sfieldIdx, (Field*) resField);
return resField;
}
/*
* Alternate version of dvmResolveStaticField().
*
* Does not force initialization of the resolved field's class.
*
* On failure, returns NULL, and sets *pFailure if pFailure is not NULL.
*/
StaticField* dvmOptResolveStaticField(ClassObject* referrer, u4 sfieldIdx,
VerifyError* pFailure)
{
DvmDex* pDvmDex = referrer->pDvmDex;
StaticField* resField;
resField = (StaticField*)dvmDexGetResolvedField(pDvmDex, sfieldIdx);
if (resField == NULL) {
const DexFieldId* pFieldId;
ClassObject* resClass;
pFieldId = dexGetFieldId(pDvmDex->pDexFile, sfieldIdx);
/*
* Find the field's class.
*/
resClass = dvmOptResolveClass(referrer, pFieldId->classIdx, pFailure);
if (resClass == NULL) {
//dvmClearOptException(dvmThreadSelf());
assert(!dvmCheckException(dvmThreadSelf()));
if (pFailure != NULL) { assert(!VERIFY_OK(*pFailure)); }
return NULL;
}
const char* fieldName =
dexStringById(pDvmDex->pDexFile, pFieldId->nameIdx);
resField = (StaticField*)dvmFindFieldHier(resClass, fieldName,
dexStringByTypeIdx(pDvmDex->pDexFile, pFieldId->typeIdx));
if (resField == NULL) {
ALOGD("DexOpt: couldn't find static field %s.%s",
resClass->descriptor, fieldName);
if (pFailure != NULL)
*pFailure = VERIFY_ERROR_NO_FIELD;
return NULL;
}
if (!dvmIsStaticField(resField)) {
ALOGD("DexOpt: wanted static, got instance for field %s.%s",
resClass->descriptor, fieldName);
if (pFailure != NULL)
*pFailure = VERIFY_ERROR_CLASS_CHANGE;
return NULL;
}
/*
* Add it to the resolved table so we're faster on the next lookup.
*
* We can only do this if we're in "dexopt", because the presence
* of a valid value in the resolution table implies that the class
* containing the static field has been initialized.
*/
if (gDvm.optimizing)
dvmDexSetResolvedField(pDvmDex, sfieldIdx, (Field*) resField);
}
/* access allowed? */
tweakLoader(referrer, resField->clazz);
bool allowed = dvmCheckFieldAccess(referrer, (Field*)resField);
untweakLoader(referrer, resField->clazz);
if (!allowed) {
ALOGI("DexOpt: access denied from %s to field %s.%s",
referrer->descriptor, resField->clazz->descriptor,
resField->name);
if (pFailure != NULL)
*pFailure = VERIFY_ERROR_ACCESS_FIELD;
return NULL;
}
return resField;
}
/*
* Alternate version of dvmResolveInstField().
*
* On failure, returns NULL, and sets *pFailure if pFailure is not NULL.
*/
InstField* dvmOptResolveInstField(ClassObject* referrer, u4 ifieldIdx,
VerifyError* pFailure)
{
DvmDex* pDvmDex = referrer->pDvmDex;
InstField* resField;
resField = (InstField*) dvmDexGetResolvedField(pDvmDex, ifieldIdx);
if (resField == NULL) {
const DexFieldId* pFieldId;
ClassObject* resClass;
pFieldId = dexGetFieldId(pDvmDex->pDexFile, ifieldIdx);
/*
* Find the field's class.
*/
resClass = dvmOptResolveClass(referrer, pFieldId->classIdx, pFailure);
if (resClass == NULL) {
//dvmClearOptException(dvmThreadSelf());
assert(!dvmCheckException(dvmThreadSelf()));
if (pFailure != NULL) { assert(!VERIFY_OK(*pFailure)); }
return NULL;
}
resField = (InstField*)dvmFindFieldHier(resClass,
dexStringById(pDvmDex->pDexFile, pFieldId->nameIdx),
dexStringByTypeIdx(pDvmDex->pDexFile, pFieldId->typeIdx));
if (resField == NULL) {
ALOGD("DexOpt: couldn't find field %s.%s",
resClass->descriptor,
dexStringById(pDvmDex->pDexFile, pFieldId->nameIdx));
if (pFailure != NULL)
*pFailure = VERIFY_ERROR_NO_FIELD;
return NULL;
}
if (dvmIsStaticField(resField)) {
ALOGD("DexOpt: wanted instance, got static for field %s.%s",
resClass->descriptor,
dexStringById(pDvmDex->pDexFile, pFieldId->nameIdx));
if (pFailure != NULL)
*pFailure = VERIFY_ERROR_CLASS_CHANGE;
return NULL;
}
/*
* Add it to the resolved table so we're faster on the next lookup.
*/
dvmDexSetResolvedField(pDvmDex, ifieldIdx, (Field*) resField);
}
/* access allowed? */
tweakLoader(referrer, resField->clazz);
bool allowed = dvmCheckFieldAccess(referrer, (Field*)resField);
untweakLoader(referrer, resField->clazz);
if (!allowed) {
ALOGI("DexOpt: access denied from %s to field %s.%s",
referrer->descriptor, resField->clazz->descriptor,
resField->name);
if (pFailure != NULL)
*pFailure = VERIFY_ERROR_ACCESS_FIELD;
return NULL;
}
return resField;
}
