java_lang_String_p fastiva_Dalvik_java_lang_System_mapLibraryName(java_lang_String_p nameObj) {
#endif
StringObject* result = NULL;
char* name;
char* mappedName;
if (nameObj == NULL) {
dvmThrowNullPointerException("userLibName == null");
THROW_V();
}
name = dvmCreateCstrFromString(nameObj);
#ifdef _DEBUG
assert(strstr(name, "cfb") == NULL);
#endif
mappedName = dvmCreateSystemLibraryName(name);
if (mappedName != NULL) {
result = dvmCreateStringFromCstr(mappedName);
dvmReleaseTrackedAlloc((Object*) result, NULL);
}
free(name);
free(mappedName);
RETURN_PTR((java_lang_String_p)result);
}
/*
* Create a "stock instance" of an exception class.
*/
static Object* createStockException(const char* descriptor, const char* msg)
{
Thread* self = dvmThreadSelf();
StringObject* msgStr = NULL;
ClassObject* clazz;
Method* init;
Object* obj;
/* find class, initialize if necessary */
clazz = dvmFindSystemClass(descriptor);
if (clazz == NULL) {
LOGE("Unable to find %s", descriptor);
return NULL;
}
init = dvmFindDirectMethodByDescriptor(clazz, "<init>",
"(Ljava/lang/String;)V");
if (init == NULL) {
LOGE("Unable to find String-arg constructor for %s", descriptor);
return NULL;
}
obj = dvmAllocObject(clazz, ALLOC_DEFAULT);
if (obj == NULL)
return NULL;
if (msg == NULL) {
msgStr = NULL;
} else {
msgStr = dvmCreateStringFromCstr(msg);
if (msgStr == NULL) {
LOGW("Could not allocate message string \"%s\"", msg);
dvmReleaseTrackedAlloc(obj, self);
return NULL;
}
}
JValue unused;
dvmCallMethod(self, init, obj, &unused, msgStr);
if (dvmCheckException(self)) {
dvmReleaseTrackedAlloc((Object*) msgStr, self);
dvmReleaseTrackedAlloc(obj, self);
return NULL;
}
dvmReleaseTrackedAlloc((Object*) msgStr, self); // okay if msgStr NULL
return obj;
}
/*
* Create a new java.lang.reflect.Field object from "field".
*
* The Field spec doesn't specify the constructor. We're going to use the
* one from our existing class libs:
*
* private Field(Class declaringClass, Class type, String name, int slot)
*/
static Object* createFieldObject(Field* field, const ClassObject* clazz)
{
Object* result = NULL;
Object* fieldObj = NULL;
StringObject* nameObj = NULL;
ClassObject* type;
char* mangle;
char* cp;
int slot, field_idx;
assert(dvmIsClassInitialized(gDvm.classJavaLangReflectField));
fieldObj = dvmAllocObject(gDvm.classJavaLangReflectField, ALLOC_DEFAULT);
if (fieldObj == NULL)
goto bail;
cp = mangle = strdup(field->signature);
type = convertSignaturePartToClass(&cp, clazz);
free(mangle);
if (type == NULL)
goto bail;
nameObj = dvmCreateStringFromCstr(field->name);
if (nameObj == NULL)
goto bail;
slot = fieldToSlot(field, clazz);
field_idx = dvmGetFieldIdx(field);
JValue unused;
dvmCallMethod(dvmThreadSelf(), gDvm.methJavaLangReflectField_init,
fieldObj, &unused, clazz, type, nameObj, slot, field_idx);
if (dvmCheckException(dvmThreadSelf())) {
ALOGD("Field class init threw exception");
goto bail;
}
result = fieldObj;
bail:
dvmReleaseTrackedAlloc((Object*) nameObj, NULL);
if (result == NULL)
dvmReleaseTrackedAlloc((Object*) fieldObj, NULL);
/* caller must dvmReleaseTrackedAlloc(result) */
return result;
}
/*
* private static String[] getClassNameList(int cookie)
*
* Returns a String array that holds the names of all classes in the
* specified DEX file.
*/
static void Dalvik_dalvik_system_DexFile_getClassNameList(const u4* args,
JValue* pResult)
{
int cookie = args[0];
DexOrJar* pDexOrJar = (DexOrJar*) cookie;
DvmDex* pDvmDex;
DexFile* pDexFile;
ArrayObject* stringArray;
Thread* self = dvmThreadSelf();
if (!validateCookie(cookie))
RETURN_VOID();
if (pDexOrJar->isDex)
pDvmDex = dvmGetRawDexFileDex(pDexOrJar->pRawDexFile);
else
pDvmDex = dvmGetJarFileDex(pDexOrJar->pJarFile);
assert(pDvmDex != NULL);
pDexFile = pDvmDex->pDexFile;
int count = pDexFile->pHeader->classDefsSize;
stringArray = dvmAllocObjectArray(gDvm.classJavaLangString, count,
ALLOC_DEFAULT);
if (stringArray == NULL) {
/* probably OOM */
ALOGD("Failed allocating array of %d strings\n", count);
assert(dvmCheckException(self));
RETURN_VOID();
}
int i;
for (i = 0; i < count; i++) {
const DexClassDef* pClassDef = dexGetClassDef(pDexFile, i);
const char* descriptor =
dexStringByTypeIdx(pDexFile, pClassDef->classIdx);
char* className = dvmDescriptorToDot(descriptor);
StringObject* str = dvmCreateStringFromCstr(className);
dvmSetObjectArrayElement(stringArray, i, (Object *)str);
dvmReleaseTrackedAlloc((Object *)str, self);
free(className);
}
dvmReleaseTrackedAlloc((Object*)stringArray, self);
RETURN_PTR(stringArray);
}
/*
* Convert an array of char* into a String[].
*
* Returns NULL on failure, with an exception raised.
*/
static ArrayObject* convertStringArray(char** strings, size_t count)
{
Thread* self = dvmThreadSelf();
/*
* Allocate an array to hold the String objects.
*/
ClassObject* stringArrayClass =
dvmFindArrayClass("[Ljava/lang/String;", NULL);
if (stringArrayClass == NULL) {
/* shouldn't happen */
LOGE("Unable to find [Ljava/lang/String;\n");
dvmAbort();
}
ArrayObject* stringArray =
dvmAllocArrayByClass(stringArrayClass, count, ALLOC_DEFAULT);
if (stringArray == NULL) {
/* probably OOM */
LOGD("Failed allocating array of %d strings\n", count);
assert(dvmCheckException(self));
return NULL;
}
/*
* Create the individual String objects and add them to the array.
*/
size_t i;
for (i = 0; i < count; i++) {
Object *str =
(Object *)dvmCreateStringFromCstr(strings[i]);
if (str == NULL) {
/* probably OOM; drop out now */
assert(dvmCheckException(self));
dvmReleaseTrackedAlloc((Object*)stringArray, self);
return NULL;
}
dvmSetObjectArrayElement(stringArray, i, str);
/* stored in tracked array, okay to release */
dvmReleaseTrackedAlloc(str, self);
}
dvmReleaseTrackedAlloc((Object*)stringArray, self);
return stringArray;
}
/*
* private static String[] getClassNameList(int cookie)
*
* Returns a String array that holds the names of all classes in the
* specified DEX file.
*/
static void Dalvik_dalvik_system_DexFile_getClassNameList(const u4* args,
JValue* pResult)
{
int cookie = args[0];
DexOrJar* pDexOrJar = (DexOrJar*) cookie;
DvmDex* pDvmDex;
DexFile* pDexFile;
ArrayObject* stringArray;
if (!validateCookie(cookie))
RETURN_VOID();
if (pDexOrJar->isDex)
pDvmDex = dvmGetRawDexFileDex(pDexOrJar->pRawDexFile);
else
pDvmDex = dvmGetJarFileDex(pDexOrJar->pJarFile);
assert(pDvmDex != NULL);
pDexFile = pDvmDex->pDexFile;
int count = pDexFile->pHeader->classDefsSize;
stringArray = dvmAllocObjectArray(gDvm.classJavaLangString, count,
ALLOC_DEFAULT);
if (stringArray == NULL)
RETURN_VOID(); // should be an OOM pending
StringObject** contents = (StringObject**) stringArray->contents;
int i;
for (i = 0; i < count; i++) {
const DexClassDef* pClassDef = dexGetClassDef(pDexFile, i);
const char* descriptor =
dexStringByTypeIdx(pDexFile, pClassDef->classIdx);
char* className = dvmDescriptorToDot(descriptor);
contents[i] = dvmCreateStringFromCstr(className, ALLOC_DEFAULT);
dvmReleaseTrackedAlloc((Object*) contents[i], NULL);
free(className);
}
dvmReleaseTrackedAlloc((Object*)stringArray, NULL);
RETURN_PTR(stringArray);
}
/*
* public static String mapLibraryName(String libname)
*/
static void Dalvik_java_lang_System_mapLibraryName(const u4* args,
JValue* pResult)
{
StringObject* nameObj = (StringObject*) args[0];
StringObject* result = NULL;
char* name;
char* mappedName;
if (nameObj == NULL) {
dvmThrowException("Ljava/lang/NullPointerException;", NULL);
RETURN_VOID();
}
name = dvmCreateCstrFromString(nameObj);
mappedName = dvmCreateSystemLibraryName(name);
if (mappedName != NULL) {
result = dvmCreateStringFromCstr(mappedName);
dvmReleaseTrackedAlloc((Object*) result, NULL);
}
free(name);
free(mappedName);
RETURN_PTR(result);
}
/**
* 使用jni GetMethodID 方法获取jmethodID 强制转为 Method 的hook 方法 示例
*/
static void newTestMethod(const u4* args, JValue* pResult,
const Method* method, struct Thread* self) {
// args 是原来函数的参数数组, 原来test函数只有一个String型参数
// 并且要注意, 如果是不是static函数, 下标0 是函数所在类的实例obj
// 在dvm中Object, jni 中的jobject 和 java 中的 Object类 都不是同一个东西
// String类对应StringObject
// 取出参数打印出来看看
StringObject* param1 = NULL;
if(dvmIsStaticMethod(method))
param1 = (StringObject*)args[0];
else
param1 = (StringObject*)args[1];
LOGD("param1:%s",dvmCreateCstrFromString(param1));
//JValue 是个union ,要返回int 就 pResult->i=1; 返回Object对象就 pResult->l = ojb;
// 但是, 在dvm中的Object, jni 中的jobject 和 java 中的 Object类 都不是同一个东西
// 所以, 我们这里使用dvm的函数来创建一个StringObject*
pResult->l = dvmCreateStringFromCstr("newTestMethod");
// 一般情况应该使用宏 : RETURN_XXX(result);
return;
}
static void returnCString(JValue* pResult, const char* s)
{
Object* result = (Object*) dvmCreateStringFromCstr(s);
dvmReleaseTrackedAlloc(result, dvmThreadSelf());
DALVIK_RETURN_PTR(result);
}
java_lang_String_p fastiva_makeString(const char* s)
{
Object* result = (Object*) dvmCreateStringFromCstr(s);
dvmReleaseTrackedAlloc(result, dvmThreadSelf());
RETURN_PTR((java_lang_String_p)result);
}
/*
* Create a new java/lang/reflect/Method object, using the contents of
* "meth" to construct it.
*
* The spec doesn't specify the constructor. We're going to use the
* one from our existing class libs:
*
* private Method(Class declaring, Class[] paramTypes, Class[] exceptTypes,
* Class returnType, String name, int slot)
*
* The caller must call dvmReleaseTrackedAlloc() on the result.
*/
Object* dvmCreateReflectMethodObject(const Method* meth)
{
Object* result = NULL;
ArrayObject* params = NULL;
ArrayObject* exceptions = NULL;
StringObject* nameObj = NULL;
Object* methObj;
ClassObject* returnType;
DexStringCache mangle;
char* cp;
int slot, method_idx;
if (dvmCheckException(dvmThreadSelf())) {
ALOGW("WARNING: dvmCreateReflectMethodObject called with "
"exception pending");
return NULL;
}
dexStringCacheInit(&mangle);
/* parent should guarantee init so we don't have to check on every call */
assert(dvmIsClassInitialized(gDvm.classJavaLangReflectMethod));
methObj = dvmAllocObject(gDvm.classJavaLangReflectMethod, ALLOC_DEFAULT);
if (methObj == NULL)
goto bail;
/*
* Convert the signature string into an array of classes representing
* the arguments, and a class for the return type.
*/
cp = dvmCopyDescriptorStringFromMethod(meth, &mangle);
params = convertSignatureToClassArray(&cp, meth->clazz);
if (params == NULL)
goto bail;
assert(*cp == ')');
cp++;
returnType = convertSignaturePartToClass(&cp, meth->clazz);
if (returnType == NULL)
goto bail;
/*
* Create an array with one entry for every exception that the class
* is declared to throw.
*/
exceptions = dvmGetMethodThrows(meth);
if (dvmCheckException(dvmThreadSelf()))
goto bail;
/* method name */
nameObj = dvmCreateStringFromCstr(meth->name);
if (nameObj == NULL)
goto bail;
slot = methodToSlot(meth);
method_idx = dvmGetMethodIdx(meth);
JValue unused;
dvmCallMethod(dvmThreadSelf(), gDvm.methJavaLangReflectMethod_init,
methObj, &unused, meth->clazz, params, exceptions, returnType,
nameObj, slot, method_idx);
if (dvmCheckException(dvmThreadSelf())) {
ALOGD("Method class init threw exception");
goto bail;
}
result = methObj;
bail:
dexStringCacheRelease(&mangle);
if (result == NULL) {
assert(dvmCheckException(dvmThreadSelf()));
}
dvmReleaseTrackedAlloc((Object*) nameObj, NULL);
dvmReleaseTrackedAlloc((Object*) params, NULL);
dvmReleaseTrackedAlloc((Object*) exceptions, NULL);
if (result == NULL)
dvmReleaseTrackedAlloc(methObj, NULL);
return result;
}
/*
* Initialize an exception with an appropriate constructor.
*
* "exception" is the exception object to initialize.
* Either or both of "msg" and "cause" may be null.
* "self" is dvmThreadSelf(), passed in so we don't have to look it up again.
*
* If the process of initializing the exception causes another
* exception (e.g., OutOfMemoryError) to be thrown, return an error
* and leave self->exception intact.
*/
static bool initException(Object* exception, const char* msg, Object* cause,
Thread* self)
{
enum {
kInitUnknown,
kInitNoarg,
kInitMsg,
kInitMsgThrow,
kInitThrow
} initKind = kInitUnknown;
Method* initMethod = NULL;
ClassObject* excepClass = exception->clazz;
StringObject* msgStr = NULL;
bool result = false;
bool needInitCause = false;
assert(self != NULL);
assert(self->exception == NULL);
/* if we have a message, create a String */
if (msg == NULL)
msgStr = NULL;
else {
msgStr = dvmCreateStringFromCstr(msg);
if (msgStr == NULL) {
LOGW("Could not allocate message string \"%s\" while "
"throwing internal exception (%s)\n",
msg, excepClass->descriptor);
goto bail;
}
}
if (cause != NULL) {
if (!dvmInstanceof(cause->clazz, gDvm.classJavaLangThrowable)) {
LOGE("Tried to init exception with cause '%s'\n",
cause->clazz->descriptor);
dvmAbort();
}
}
/*
* The Throwable class has four public constructors:
* (1) Throwable()
* (2) Throwable(String message)
* (3) Throwable(String message, Throwable cause) (added in 1.4)
* (4) Throwable(Throwable cause) (added in 1.4)
*
* The first two are part of the original design, and most exception
* classes should support them. The third prototype was used by
* individual exceptions. e.g. ClassNotFoundException added it in 1.2.
* The general "cause" mechanism was added in 1.4. Some classes,
* such as IllegalArgumentException, initially supported the first
* two, but added the second two in a later release.
*
* Exceptions may be picky about how their "cause" field is initialized.
* If you call ClassNotFoundException(String), it may choose to
* initialize its "cause" field to null. Doing so prevents future
* calls to Throwable.initCause().
*
* So, if "cause" is not NULL, we need to look for a constructor that
* takes a throwable. If we can't find one, we fall back on calling
* #1/#2 and making a separate call to initCause(). Passing a null ref
* for "message" into Throwable(String, Throwable) is allowed, but we
* prefer to use the Throwable-only version because it has different
* behavior.
*
* java.lang.TypeNotPresentException is a strange case -- it has #3 but
* not #2. (Some might argue that the constructor is actually not #3,
* because it doesn't take the message string as an argument, but it
* has the same effect and we can work with it here.)
*
* java.lang.AssertionError is also a strange case -- it has a
* constructor that takes an Object, but not one that takes a String.
* There may be other cases like this, as well, so we generally look
* for an Object-taking constructor if we can't find one that takes
* a String.
*/
if (cause == NULL) {
if (msgStr == NULL) {
initMethod = findExceptionInitMethod(excepClass, false, false);
initKind = kInitNoarg;
} else {
initMethod = findExceptionInitMethod(excepClass, true, false);
if (initMethod != NULL) {
initKind = kInitMsg;
} else {
/* no #2, try #3 */
initMethod = findExceptionInitMethod(excepClass, true, true);
if (initMethod != NULL) {
initKind = kInitMsgThrow;
}
}
}
} else {
if (msgStr == NULL) {
initMethod = findExceptionInitMethod(excepClass, false, true);
if (initMethod != NULL) {
initKind = kInitThrow;
} else {
initMethod = findExceptionInitMethod(excepClass, false, false);
initKind = kInitNoarg;
needInitCause = true;
}
} else {
initMethod = findExceptionInitMethod(excepClass, true, true);
if (initMethod != NULL) {
initKind = kInitMsgThrow;
} else {
initMethod = findExceptionInitMethod(excepClass, true, false);
initKind = kInitMsg;
needInitCause = true;
}
}
}
if (initMethod == NULL) {
/*
* We can't find the desired constructor. This can happen if a
* subclass of java/lang/Throwable doesn't define an expected
* constructor, e.g. it doesn't provide one that takes a string
* when a message has been provided.
*/
LOGW("WARNING: exception class '%s' missing constructor "
"(msg='%s' kind=%d)\n",
excepClass->descriptor, msg, initKind);
assert(strcmp(excepClass->descriptor,
"Ljava/lang/RuntimeException;") != 0);
dvmThrowChainedException("Ljava/lang/RuntimeException;",
"re-throw on exception class missing constructor", NULL);
goto bail;
}
/*
* Call the constructor with the appropriate arguments.
*/
JValue unused;
switch (initKind) {
case kInitNoarg:
LOGVV("+++ exc noarg (ic=%d)\n", needInitCause);
dvmCallMethod(self, initMethod, exception, &unused);
break;
case kInitMsg:
LOGVV("+++ exc msg (ic=%d)\n", needInitCause);
dvmCallMethod(self, initMethod, exception, &unused, msgStr);
break;
case kInitThrow:
LOGVV("+++ exc throw");
assert(!needInitCause);
dvmCallMethod(self, initMethod, exception, &unused, cause);
break;
case kInitMsgThrow:
LOGVV("+++ exc msg+throw");
assert(!needInitCause);
dvmCallMethod(self, initMethod, exception, &unused, msgStr, cause);
break;
default:
assert(false);
goto bail;
}
/*
* It's possible the constructor has thrown an exception. If so, we
* return an error and let our caller deal with it.
*/
if (self->exception != NULL) {
LOGW("Exception thrown (%s) while throwing internal exception (%s)\n",
self->exception->clazz->descriptor, exception->clazz->descriptor);
goto bail;
}
/*
* If this exception was caused by another exception, and we weren't
* able to find a cause-setting constructor, set the "cause" field
* with an explicit call.
*/
if (needInitCause) {
Method* initCause;
initCause = dvmFindVirtualMethodHierByDescriptor(excepClass, "initCause",
"(Ljava/lang/Throwable;)Ljava/lang/Throwable;");
if (initCause != NULL) {
dvmCallMethod(self, initCause, exception, &unused, cause);
if (self->exception != NULL) {
/* initCause() threw an exception; return an error and
* let the caller deal with it.
*/
LOGW("Exception thrown (%s) during initCause() "
"of internal exception (%s)\n",
self->exception->clazz->descriptor,
exception->clazz->descriptor);
goto bail;
}
} else {
LOGW("WARNING: couldn't find initCause in '%s'\n",
excepClass->descriptor);
}
}
result = true;
bail:
dvmReleaseTrackedAlloc((Object*) msgStr, self); // NULL is ok
return result;
}
/*
* Generate an array of StackTraceElement objects from the raw integer
* data encoded by dvmFillInStackTrace().
*
* "intVals" points to the first {method,pc} pair.
*
* The returned array is not added to the "local refs" list.
*/
ArrayObject* dvmGetStackTraceRaw(const int* intVals, int stackDepth)
{
ArrayObject* steArray = NULL;
int i;
/* init this if we haven't yet */
if (!dvmIsClassInitialized(gDvm.classJavaLangStackTraceElement))
dvmInitClass(gDvm.classJavaLangStackTraceElement);
/* allocate a StackTraceElement array */
steArray = dvmAllocArray(gDvm.classJavaLangStackTraceElementArray,
stackDepth, kObjectArrayRefWidth, ALLOC_DEFAULT);
if (steArray == NULL)
goto bail;
/*
* Allocate and initialize a StackTraceElement for each stack frame.
* We use the standard constructor to configure the object.
*/
for (i = 0; i < stackDepth; i++) {
Object* ste;
Method* meth;
StringObject* className;
StringObject* methodName;
StringObject* fileName;
int lineNumber, pc;
const char* sourceFile;
char* dotName;
ste = dvmAllocObject(gDvm.classJavaLangStackTraceElement,ALLOC_DEFAULT);
if (ste == NULL)
goto bail;
meth = (Method*) *intVals++;
pc = *intVals++;
if (pc == -1) // broken top frame?
lineNumber = 0;
else
lineNumber = dvmLineNumFromPC(meth, pc);
dotName = dvmDescriptorToDot(meth->clazz->descriptor);
className = dvmCreateStringFromCstr(dotName);
free(dotName);
methodName = dvmCreateStringFromCstr(meth->name);
sourceFile = dvmGetMethodSourceFile(meth);
if (sourceFile != NULL)
fileName = dvmCreateStringFromCstr(sourceFile);
else
fileName = NULL;
/*
* Invoke:
* public StackTraceElement(String declaringClass, String methodName,
* String fileName, int lineNumber)
* (where lineNumber==-2 means "native")
*/
JValue unused;
dvmCallMethod(dvmThreadSelf(), gDvm.methJavaLangStackTraceElement_init,
ste, &unused, className, methodName, fileName, lineNumber);
dvmReleaseTrackedAlloc(ste, NULL);
dvmReleaseTrackedAlloc((Object*) className, NULL);
dvmReleaseTrackedAlloc((Object*) methodName, NULL);
dvmReleaseTrackedAlloc((Object*) fileName, NULL);
if (dvmCheckException(dvmThreadSelf()))
goto bail;
dvmSetObjectArrayElement(steArray, i, ste);
}
bail:
dvmReleaseTrackedAlloc((Object*) steArray, NULL);
return steArray;
}
