| /* |
| * Copyright (C) 2008 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| /* |
| * Native method resolution. |
| * |
| * Currently the "Dalvik native" methods are only used for internal methods. |
| * Someday we may want to export the interface as a faster but riskier |
| * alternative to JNI. |
| */ |
| #include "Dalvik.h" |
| |
| #include <stdlib.h> |
| #include <dlfcn.h> |
| |
| static void freeSharedLibEntry(void* ptr); |
| static void* lookupSharedLibMethod(const Method* method); |
| |
| |
| /* |
| * Initialize the native code loader. |
| */ |
| bool dvmNativeStartup(void) |
| { |
| gDvm.nativeLibs = dvmHashTableCreate(4, freeSharedLibEntry); |
| if (gDvm.nativeLibs == NULL) |
| return false; |
| |
| return true; |
| } |
| |
| /* |
| * Free up our tables. |
| */ |
| void dvmNativeShutdown(void) |
| { |
| dvmHashTableFree(gDvm.nativeLibs); |
| gDvm.nativeLibs = NULL; |
| } |
| |
| |
| /* |
| * Resolve a native method and invoke it. |
| * |
| * This is executed as if it were a native bridge or function. If the |
| * resolution succeeds, method->insns is replaced, and we don't go through |
| * here again unless the method is unregistered. |
| * |
| * Initializes method's class if necessary. |
| * |
| * An exception is thrown on resolution failure. |
| * |
| * (This should not be taking "const Method*", because it modifies the |
| * structure, but the declaration needs to match the DalvikBridgeFunc |
| * type definition.) |
| */ |
| void dvmResolveNativeMethod(const u4* args, JValue* pResult, |
| const Method* method, Thread* self) |
| { |
| ClassObject* clazz = method->clazz; |
| void* func; |
| |
| /* |
| * If this is a static method, it could be called before the class |
| * has been initialized. |
| */ |
| if (dvmIsStaticMethod(method)) { |
| if (!dvmIsClassInitialized(clazz) && !dvmInitClass(clazz)) { |
| assert(dvmCheckException(dvmThreadSelf())); |
| return; |
| } |
| } else { |
| assert(dvmIsClassInitialized(clazz) || |
| dvmIsClassInitializing(clazz)); |
| } |
| |
| /* start with our internal-native methods */ |
| func = dvmLookupInternalNativeMethod(method); |
| if (func != NULL) { |
| /* resolution always gets the same answer, so no race here */ |
| IF_LOGVV() { |
| char* desc = dexProtoCopyMethodDescriptor(&method->prototype); |
| LOGVV("+++ resolved native %s.%s %s, invoking\n", |
| clazz->descriptor, method->name, desc); |
| free(desc); |
| } |
| if (dvmIsSynchronizedMethod(method)) { |
| LOGE("ERROR: internal-native can't be declared 'synchronized'\n"); |
| LOGE("Failing on %s.%s\n", method->clazz->descriptor, method->name); |
| dvmAbort(); // harsh, but this is VM-internal problem |
| } |
| DalvikBridgeFunc dfunc = (DalvikBridgeFunc) func; |
| dvmSetNativeFunc((Method*) method, dfunc, NULL); |
| dfunc(args, pResult, method, self); |
| return; |
| } |
| |
| /* now scan any DLLs we have loaded for JNI signatures */ |
| func = lookupSharedLibMethod(method); |
| if (func != NULL) { |
| /* found it, point it at the JNI bridge and then call it */ |
| dvmUseJNIBridge((Method*) method, func); |
| (*method->nativeFunc)(args, pResult, method, self); |
| return; |
| } |
| |
| IF_LOGW() { |
| char* desc = dexProtoCopyMethodDescriptor(&method->prototype); |
| LOGW("No implementation found for native %s.%s %s\n", |
| clazz->descriptor, method->name, desc); |
| free(desc); |
| } |
| |
| dvmThrowException("Ljava/lang/UnsatisfiedLinkError;", method->name); |
| } |
| |
| |
| /* |
| * =========================================================================== |
| * Native shared library support |
| * =========================================================================== |
| */ |
| |
| // TODO? if a ClassLoader is unloaded, we need to unload all DLLs that |
| // are associated with it. (Or not -- can't determine if native code |
| // is still using parts of it.) |
| |
| typedef enum OnLoadState { |
| kOnLoadPending = 0, /* initial state, must be zero */ |
| kOnLoadFailed, |
| kOnLoadOkay, |
| } OnLoadState; |
| |
| /* |
| * We add one of these to the hash table for every library we load. The |
| * hash is on the "pathName" field. |
| */ |
| typedef struct SharedLib { |
| char* pathName; /* absolute path to library */ |
| void* handle; /* from dlopen */ |
| Object* classLoader; /* ClassLoader we are associated with */ |
| |
| pthread_mutex_t onLoadLock; /* guards remaining items */ |
| pthread_cond_t onLoadCond; /* wait for JNI_OnLoad in other thread */ |
| u4 onLoadThreadId; /* recursive invocation guard */ |
| OnLoadState onLoadResult; /* result of earlier JNI_OnLoad */ |
| } SharedLib; |
| |
| /* |
| * (This is a dvmHashTableLookup callback.) |
| * |
| * Find an entry that matches the string. |
| */ |
| static int hashcmpNameStr(const void* ventry, const void* vname) |
| { |
| const SharedLib* pLib = (const SharedLib*) ventry; |
| const char* name = (const char*) vname; |
| |
| return strcmp(pLib->pathName, name); |
| } |
| |
| /* |
| * (This is a dvmHashTableLookup callback.) |
| * |
| * Find an entry that matches the new entry. |
| * |
| * We don't compare the class loader here, because you're not allowed to |
| * have the same shared library associated with more than one CL. |
| */ |
| static int hashcmpSharedLib(const void* ventry, const void* vnewEntry) |
| { |
| const SharedLib* pLib = (const SharedLib*) ventry; |
| const SharedLib* pNewLib = (const SharedLib*) vnewEntry; |
| |
| LOGD("--- comparing %p '%s' %p '%s'\n", |
| pLib, pLib->pathName, pNewLib, pNewLib->pathName); |
| return strcmp(pLib->pathName, pNewLib->pathName); |
| } |
| |
| /* |
| * Check to see if an entry with the same pathname already exists. |
| */ |
| static SharedLib* findSharedLibEntry(const char* pathName) |
| { |
| u4 hash = dvmComputeUtf8Hash(pathName); |
| void* ent; |
| |
| ent = dvmHashTableLookup(gDvm.nativeLibs, hash, (void*)pathName, |
| hashcmpNameStr, false); |
| return ent; |
| } |
| |
| /* |
| * Add the new entry to the table. |
| * |
| * Returns the table entry, which will not be the same as "pLib" if the |
| * entry already exists. |
| */ |
| static SharedLib* addSharedLibEntry(SharedLib* pLib) |
| { |
| u4 hash = dvmComputeUtf8Hash(pLib->pathName); |
| |
| /* |
| * Do the lookup with the "add" flag set. If we add it, we will get |
| * our own pointer back. If somebody beat us to the punch, we'll get |
| * their pointer back instead. |
| */ |
| return dvmHashTableLookup(gDvm.nativeLibs, hash, pLib, hashcmpSharedLib, |
| true); |
| } |
| |
| /* |
| * Free up an entry. (This is a dvmHashTableFree callback.) |
| */ |
| static void freeSharedLibEntry(void* ptr) |
| { |
| SharedLib* pLib = (SharedLib*) ptr; |
| |
| /* |
| * Calling dlclose() here is somewhat dangerous, because it's possible |
| * that a thread outside the VM is still accessing the code we loaded. |
| */ |
| if (false) |
| dlclose(pLib->handle); |
| free(pLib->pathName); |
| free(pLib); |
| } |
| |
| /* |
| * Convert library name to system-dependent form, e.g. "jpeg" becomes |
| * "libjpeg.so". |
| * |
| * (Should we have this take buffer+len and avoid the alloc? It gets |
| * called very rarely.) |
| */ |
| char* dvmCreateSystemLibraryName(char* libName) |
| { |
| char buf[256]; |
| int len; |
| |
| len = snprintf(buf, sizeof(buf), OS_SHARED_LIB_FORMAT_STR, libName); |
| if (len >= (int) sizeof(buf)) |
| return NULL; |
| else |
| return strdup(buf); |
| } |
| |
| |
| #if 0 |
| /* |
| * Find a library, given the lib's system-dependent name (e.g. "libjpeg.so"). |
| * |
| * We need to search through the path defined by the java.library.path |
| * property. |
| * |
| * Returns NULL if the library was not found. |
| */ |
| static char* findLibrary(const char* libSysName) |
| { |
| char* javaLibraryPath = NULL; |
| char* testName = NULL; |
| char* start; |
| char* cp; |
| bool done; |
| |
| javaLibraryPath = dvmGetProperty("java.library.path"); |
| if (javaLibraryPath == NULL) |
| goto bail; |
| |
| LOGVV("+++ path is '%s'\n", javaLibraryPath); |
| |
| start = cp = javaLibraryPath; |
| while (cp != NULL) { |
| char pathBuf[256]; |
| int len; |
| |
| cp = strchr(start, ':'); |
| if (cp != NULL) |
| *cp = '\0'; |
| |
| len = snprintf(pathBuf, sizeof(pathBuf), "%s/%s", start, libSysName); |
| if (len >= (int) sizeof(pathBuf)) { |
| LOGW("Path overflowed %d bytes: '%s' / '%s'\n", |
| len, start, libSysName); |
| /* keep going, next one might fit */ |
| } else { |
| LOGVV("+++ trying '%s'\n", pathBuf); |
| if (access(pathBuf, R_OK) == 0) { |
| testName = strdup(pathBuf); |
| break; |
| } |
| } |
| |
| start = cp +1; |
| } |
| |
| bail: |
| free(javaLibraryPath); |
| return testName; |
| } |
| |
| /* |
| * Load a native shared library, given the system-independent piece of |
| * the library name. |
| * |
| * Throws an exception on failure. |
| */ |
| void dvmLoadNativeLibrary(StringObject* libNameObj, Object* classLoader) |
| { |
| char* libName = NULL; |
| char* libSysName = NULL; |
| char* libPath = NULL; |
| |
| /* |
| * If "classLoader" isn't NULL, call the class loader's "findLibrary" |
| * method with the lib name. If it returns a non-NULL result, we use |
| * that as the pathname. |
| */ |
| if (classLoader != NULL) { |
| Method* findLibrary; |
| Object* findLibResult; |
| |
| findLibrary = dvmFindVirtualMethodByDescriptor(classLoader->clazz, |
| "findLibrary", "(Ljava/lang/String;)Ljava/lang/String;"); |
| if (findLibrary == NULL) { |
| LOGW("Could not find findLibrary() in %s\n", |
| classLoader->clazz->name); |
| dvmThrowException("Ljava/lang/UnsatisfiedLinkError;", |
| "findLibrary"); |
| goto bail; |
| } |
| |
| findLibResult = (Object*)(u4) dvmCallMethod(findLibrary, classLoader, |
| libNameObj); |
| if (dvmCheckException()) { |
| LOGV("returning early on exception\n"); |
| goto bail; |
| } |
| if (findLibResult != NULL) { |
| /* success! */ |
| libPath = dvmCreateCstrFromString(libNameObj); |
| LOGI("Found library through CL: '%s'\n", libPath); |
| dvmLoadNativeCode(libPath, classLoader); |
| goto bail; |
| } |
| } |
| |
| libName = dvmCreateCstrFromString(libNameObj); |
| if (libName == NULL) |
| goto bail; |
| libSysName = dvmCreateSystemLibraryName(libName); |
| if (libSysName == NULL) |
| goto bail; |
| |
| libPath = findLibrary(libSysName); |
| if (libPath != NULL) { |
| LOGD("Found library through path: '%s'\n", libPath); |
| dvmLoadNativeCode(libPath, classLoader); |
| } else { |
| LOGW("Unable to locate shared lib matching '%s'\n", libSysName); |
| dvmThrowException("Ljava/lang/UnsatisfiedLinkError;", libName); |
| } |
| |
| bail: |
| free(libName); |
| free(libSysName); |
| free(libPath); |
| } |
| #endif |
| |
| |
| /* |
| * Check the result of an earlier call to JNI_OnLoad on this library. If |
| * the call has not yet finished in another thread, wait for it. |
| */ |
| static bool checkOnLoadResult(SharedLib* pEntry) |
| { |
| Thread* self = dvmThreadSelf(); |
| if (pEntry->onLoadThreadId == self->threadId) { |
| /* |
| * Check this so we don't end up waiting for ourselves. We need |
| * to return "true" so the caller can continue. |
| */ |
| LOGI("threadid=%d: recursive native library load attempt (%s)\n", |
| self->threadId, pEntry->pathName); |
| return true; |
| } |
| |
| LOGV("+++ retrieving %s OnLoad status\n", pEntry->pathName); |
| bool result; |
| |
| dvmLockMutex(&pEntry->onLoadLock); |
| while (pEntry->onLoadResult == kOnLoadPending) { |
| LOGD("threadid=%d: waiting for %s OnLoad status\n", |
| self->threadId, pEntry->pathName); |
| ThreadStatus oldStatus = dvmChangeStatus(self, THREAD_VMWAIT); |
| pthread_cond_wait(&pEntry->onLoadCond, &pEntry->onLoadLock); |
| dvmChangeStatus(self, oldStatus); |
| } |
| if (pEntry->onLoadResult == kOnLoadOkay) { |
| LOGV("+++ earlier OnLoad(%s) okay\n", pEntry->pathName); |
| result = true; |
| } else { |
| LOGV("+++ earlier OnLoad(%s) failed\n", pEntry->pathName); |
| result = false; |
| } |
| dvmUnlockMutex(&pEntry->onLoadLock); |
| return result; |
| } |
| |
| typedef int (*OnLoadFunc)(JavaVM*, void*); |
| |
| /* |
| * Load native code from the specified absolute pathname. Per the spec, |
| * if we've already loaded a library with the specified pathname, we |
| * return without doing anything. |
| * |
| * TODO? for better results we should absolutify the pathname. For fully |
| * correct results we should stat to get the inode and compare that. The |
| * existing implementation is fine so long as everybody is using |
| * System.loadLibrary. |
| * |
| * The library will be associated with the specified class loader. The JNI |
| * spec says we can't load the same library into more than one class loader. |
| * |
| * Returns "true" on success. |
| */ |
| bool dvmLoadNativeCode(const char* pathName, Object* classLoader) |
| { |
| SharedLib* pEntry; |
| void* handle; |
| bool verbose; |
| |
| /* reduce noise by not chattering about system libraries */ |
| verbose = !!strncmp(pathName, "/system", sizeof("/system")-1); |
| verbose = verbose && !!strncmp(pathName, "/vendor", sizeof("/vendor")-1); |
| |
| if (verbose) |
| LOGD("Trying to load lib %s %p\n", pathName, classLoader); |
| |
| /* |
| * See if we've already loaded it. If we have, and the class loader |
| * matches, return successfully without doing anything. |
| */ |
| pEntry = findSharedLibEntry(pathName); |
| if (pEntry != NULL) { |
| if (pEntry->classLoader != classLoader) { |
| LOGW("Shared lib '%s' already opened by CL %p; can't open in %p\n", |
| pathName, pEntry->classLoader, classLoader); |
| return false; |
| } |
| if (verbose) { |
| LOGD("Shared lib '%s' already loaded in same CL %p\n", |
| pathName, classLoader); |
| } |
| if (!checkOnLoadResult(pEntry)) |
| return false; |
| return true; |
| } |
| |
| /* |
| * Open the shared library. Because we're using a full path, the system |
| * doesn't have to search through LD_LIBRARY_PATH. (It may do so to |
| * resolve this library's dependencies though.) |
| * |
| * Failures here are expected when java.library.path has several entries |
| * and we have to hunt for the lib. |
| * |
| * The current version of the dynamic linker prints detailed information |
| * about dlopen() failures. Some things to check if the message is |
| * cryptic: |
| * - make sure the library exists on the device |
| * - verify that the right path is being opened (the debug log message |
| * above can help with that) |
| * - check to see if the library is valid (e.g. not zero bytes long) |
| * - check config/prelink-linux-arm.map to ensure that the library |
| * is listed and is not being overrun by the previous entry (if |
| * loading suddenly stops working on a prelinked library, this is |
| * a good one to check) |
| * - write a trivial app that calls sleep() then dlopen(), attach |
| * to it with "strace -p <pid>" while it sleeps, and watch for |
| * attempts to open nonexistent dependent shared libs |
| * |
| * This can execute slowly for a large library on a busy system, so we |
| * want to switch from RUNNING to VMWAIT while it executes. This allows |
| * the GC to ignore us. |
| */ |
| Thread* self = dvmThreadSelf(); |
| ThreadStatus oldStatus = dvmChangeStatus(self, THREAD_VMWAIT); |
| handle = dlopen(pathName, RTLD_LAZY); |
| dvmChangeStatus(self, oldStatus); |
| |
| if (handle == NULL) { |
| LOGI("Unable to dlopen(%s): %s\n", pathName, dlerror()); |
| return false; |
| } |
| |
| /* create a new entry */ |
| SharedLib* pNewEntry; |
| pNewEntry = (SharedLib*) calloc(1, sizeof(SharedLib)); |
| pNewEntry->pathName = strdup(pathName); |
| pNewEntry->handle = handle; |
| pNewEntry->classLoader = classLoader; |
| dvmInitMutex(&pNewEntry->onLoadLock); |
| pthread_cond_init(&pNewEntry->onLoadCond, NULL); |
| pNewEntry->onLoadThreadId = self->threadId; |
| |
| /* try to add it to the list */ |
| SharedLib* pActualEntry = addSharedLibEntry(pNewEntry); |
| |
| if (pNewEntry != pActualEntry) { |
| LOGI("WOW: we lost a race to add a shared lib (%s CL=%p)\n", |
| pathName, classLoader); |
| freeSharedLibEntry(pNewEntry); |
| return checkOnLoadResult(pActualEntry); |
| } else { |
| if (verbose) |
| LOGD("Added shared lib %s %p\n", pathName, classLoader); |
| |
| bool result = true; |
| void* vonLoad; |
| int version; |
| |
| vonLoad = dlsym(handle, "JNI_OnLoad"); |
| if (vonLoad == NULL) { |
| LOGD("No JNI_OnLoad found in %s %p, skipping init\n", |
| pathName, classLoader); |
| } else { |
| /* |
| * Call JNI_OnLoad. We have to override the current class |
| * loader, which will always be "null" since the stuff at the |
| * top of the stack is around Runtime.loadLibrary(). (See |
| * the comments in the JNI FindClass function.) |
| */ |
| OnLoadFunc func = vonLoad; |
| Object* prevOverride = self->classLoaderOverride; |
| |
| self->classLoaderOverride = classLoader; |
| oldStatus = dvmChangeStatus(self, THREAD_NATIVE); |
| LOGV("+++ calling JNI_OnLoad(%s)\n", pathName); |
| version = (*func)(gDvm.vmList, NULL); |
| dvmChangeStatus(self, oldStatus); |
| self->classLoaderOverride = prevOverride; |
| |
| if (version != JNI_VERSION_1_2 && version != JNI_VERSION_1_4 && |
| version != JNI_VERSION_1_6) |
| { |
| LOGW("JNI_OnLoad returned bad version (%d) in %s %p\n", |
| version, pathName, classLoader); |
| /* |
| * It's unwise to call dlclose() here, but we can mark it |
| * as bad and ensure that future load attempts will fail. |
| * |
| * We don't know how far JNI_OnLoad got, so there could |
| * be some partially-initialized stuff accessible through |
| * newly-registered native method calls. We could try to |
| * unregister them, but that doesn't seem worthwhile. |
| */ |
| result = false; |
| } else { |
| LOGV("+++ finished JNI_OnLoad %s\n", pathName); |
| } |
| } |
| |
| if (result) |
| pNewEntry->onLoadResult = kOnLoadOkay; |
| else |
| pNewEntry->onLoadResult = kOnLoadFailed; |
| |
| pNewEntry->onLoadThreadId = 0; |
| |
| /* |
| * Broadcast a wakeup to anybody sleeping on the condition variable. |
| */ |
| dvmLockMutex(&pNewEntry->onLoadLock); |
| pthread_cond_broadcast(&pNewEntry->onLoadCond); |
| dvmUnlockMutex(&pNewEntry->onLoadLock); |
| return result; |
| } |
| } |
| |
| |
| /* |
| * Un-register JNI native methods. |
| * |
| * There are two relevant fields in struct Method, "nativeFunc" and |
| * "insns". The former holds a function pointer to a "bridge" function |
| * (or, for internal native, the actual implementation). The latter holds |
| * a pointer to the actual JNI method. |
| * |
| * The obvious approach is to reset both fields to their initial state |
| * (nativeFunc points at dvmResolveNativeMethod, insns holds NULL), but |
| * that creates some unpleasant race conditions. In particular, if another |
| * thread is executing inside the call bridge for the method in question, |
| * and we reset insns to NULL, the VM will crash. (See the comments above |
| * dvmSetNativeFunc() for additional commentary.) |
| * |
| * We can't rely on being able to update two 32-bit fields in one atomic |
| * operation (e.g. no 64-bit atomic ops on ARMv5TE), so we want to change |
| * only one field. It turns out we can simply reset nativeFunc to its |
| * initial state, leaving insns alone, because dvmResolveNativeMethod |
| * ignores "insns" entirely. |
| * |
| * When the method is re-registered, both fields will be updated, but |
| * dvmSetNativeFunc guarantees that "insns" is updated first. This means |
| * we shouldn't be in a situation where we have a "live" call bridge and |
| * a stale implementation pointer. |
| */ |
| static void unregisterJNINativeMethods(Method* methods, size_t count) |
| { |
| while (count != 0) { |
| count--; |
| |
| Method* meth = &methods[count]; |
| if (!dvmIsNativeMethod(meth)) |
| continue; |
| if (dvmIsAbstractMethod(meth)) /* avoid abstract method stubs */ |
| continue; |
| |
| /* |
| * Strictly speaking this ought to test the function pointer against |
| * the various JNI bridge functions to ensure that we only undo |
| * methods that were registered through JNI. In practice, any |
| * native method with a non-NULL "insns" is a registered JNI method. |
| * |
| * If we inadvertently unregister an internal-native, it'll get |
| * re-resolved on the next call; unregistering an unregistered |
| * JNI method is a no-op. So we don't really need to test for |
| * anything. |
| */ |
| |
| LOGD("Unregistering JNI method %s.%s:%s\n", |
| meth->clazz->descriptor, meth->name, meth->shorty); |
| dvmSetNativeFunc(meth, dvmResolveNativeMethod, NULL); |
| } |
| } |
| |
| /* |
| * Un-register all JNI native methods from a class. |
| */ |
| void dvmUnregisterJNINativeMethods(ClassObject* clazz) |
| { |
| unregisterJNINativeMethods(clazz->directMethods, clazz->directMethodCount); |
| unregisterJNINativeMethods(clazz->virtualMethods, clazz->virtualMethodCount); |
| } |
| |
| |
| /* |
| * =========================================================================== |
| * Signature-based method lookup |
| * =========================================================================== |
| */ |
| |
| /* |
| * Create the pre-mangled form of the class+method string. |
| * |
| * Returns a newly-allocated string, and sets "*pLen" to the length. |
| */ |
| static char* createJniNameString(const char* classDescriptor, |
| const char* methodName, int* pLen) |
| { |
| char* result; |
| size_t descriptorLength = strlen(classDescriptor); |
| |
| *pLen = 4 + descriptorLength + strlen(methodName); |
| |
| result = malloc(*pLen +1); |
| if (result == NULL) |
| return NULL; |
| |
| /* |
| * Add one to classDescriptor to skip the "L", and then replace |
| * the final ";" with a "/" after the sprintf() call. |
| */ |
| sprintf(result, "Java/%s%s", classDescriptor + 1, methodName); |
| result[5 + (descriptorLength - 2)] = '/'; |
| |
| return result; |
| } |
| |
| /* |
| * Returns a newly-allocated, mangled copy of "str". |
| * |
| * "str" is a "modified UTF-8" string. We convert it to UTF-16 first to |
| * make life simpler. |
| */ |
| static char* mangleString(const char* str, int len) |
| { |
| u2* utf16 = NULL; |
| char* mangle = NULL; |
| int charLen; |
| |
| //LOGI("mangling '%s' %d\n", str, len); |
| |
| assert(str[len] == '\0'); |
| |
| charLen = dvmUtf8Len(str); |
| utf16 = (u2*) malloc(sizeof(u2) * charLen); |
| if (utf16 == NULL) |
| goto bail; |
| |
| dvmConvertUtf8ToUtf16(utf16, str); |
| |
| /* |
| * Compute the length of the mangled string. |
| */ |
| int i, mangleLen = 0; |
| |
| for (i = 0; i < charLen; i++) { |
| u2 ch = utf16[i]; |
| |
| if (ch == '$' || ch > 127) { |
| mangleLen += 6; |
| } else { |
| switch (ch) { |
| case '_': |
| case ';': |
| case '[': |
| mangleLen += 2; |
| break; |
| default: |
| mangleLen++; |
| break; |
| } |
| } |
| } |
| |
| char* cp; |
| |
| mangle = (char*) malloc(mangleLen +1); |
| if (mangle == NULL) |
| goto bail; |
| |
| for (i = 0, cp = mangle; i < charLen; i++) { |
| u2 ch = utf16[i]; |
| |
| if (ch == '$' || ch > 127) { |
| sprintf(cp, "_0%04x", ch); |
| cp += 6; |
| } else { |
| switch (ch) { |
| case '_': |
| *cp++ = '_'; |
| *cp++ = '1'; |
| break; |
| case ';': |
| *cp++ = '_'; |
| *cp++ = '2'; |
| break; |
| case '[': |
| *cp++ = '_'; |
| *cp++ = '3'; |
| break; |
| case '/': |
| *cp++ = '_'; |
| break; |
| default: |
| *cp++ = (char) ch; |
| break; |
| } |
| } |
| } |
| |
| *cp = '\0'; |
| |
| bail: |
| free(utf16); |
| return mangle; |
| } |
| |
| /* |
| * Create the mangled form of the parameter types. |
| */ |
| static char* createMangledSignature(const DexProto* proto) |
| { |
| DexStringCache sigCache; |
| const char* interim; |
| char* result; |
| |
| dexStringCacheInit(&sigCache); |
| interim = dexProtoGetParameterDescriptors(proto, &sigCache); |
| result = mangleString(interim, strlen(interim)); |
| dexStringCacheRelease(&sigCache); |
| |
| return result; |
| } |
| |
| /* |
| * (This is a dvmHashForeach callback.) |
| * |
| * Search for a matching method in this shared library. |
| * |
| * TODO: we may want to skip libraries for which JNI_OnLoad failed. |
| */ |
| static int findMethodInLib(void* vlib, void* vmethod) |
| { |
| const SharedLib* pLib = (const SharedLib*) vlib; |
| const Method* meth = (const Method*) vmethod; |
| char* preMangleCM = NULL; |
| char* mangleCM = NULL; |
| char* mangleSig = NULL; |
| char* mangleCMSig = NULL; |
| void* func = NULL; |
| int len; |
| |
| if (meth->clazz->classLoader != pLib->classLoader) { |
| LOGV("+++ not scanning '%s' for '%s' (wrong CL)\n", |
| pLib->pathName, meth->name); |
| return 0; |
| } else |
| LOGV("+++ scanning '%s' for '%s'\n", pLib->pathName, meth->name); |
| |
| /* |
| * First, we try it without the signature. |
| */ |
| preMangleCM = |
| createJniNameString(meth->clazz->descriptor, meth->name, &len); |
| if (preMangleCM == NULL) |
| goto bail; |
| |
| mangleCM = mangleString(preMangleCM, len); |
| if (mangleCM == NULL) |
| goto bail; |
| |
| LOGV("+++ calling dlsym(%s)\n", mangleCM); |
| func = dlsym(pLib->handle, mangleCM); |
| if (func == NULL) { |
| mangleSig = |
| createMangledSignature(&meth->prototype); |
| if (mangleSig == NULL) |
| goto bail; |
| |
| mangleCMSig = (char*) malloc(strlen(mangleCM) + strlen(mangleSig) +3); |
| if (mangleCMSig == NULL) |
| goto bail; |
| |
| sprintf(mangleCMSig, "%s__%s", mangleCM, mangleSig); |
| |
| LOGV("+++ calling dlsym(%s)\n", mangleCMSig); |
| func = dlsym(pLib->handle, mangleCMSig); |
| if (func != NULL) { |
| LOGV("Found '%s' with dlsym\n", mangleCMSig); |
| } |
| } else { |
| LOGV("Found '%s' with dlsym\n", mangleCM); |
| } |
| |
| bail: |
| free(preMangleCM); |
| free(mangleCM); |
| free(mangleSig); |
| free(mangleCMSig); |
| return (int) func; |
| } |
| |
| /* |
| * See if the requested method lives in any of the currently-loaded |
| * shared libraries. We do this by checking each of them for the expected |
| * method signature. |
| */ |
| static void* lookupSharedLibMethod(const Method* method) |
| { |
| if (gDvm.nativeLibs == NULL) { |
| LOGE("Unexpected init state: nativeLibs not ready\n"); |
| dvmAbort(); |
| } |
| return (void*) dvmHashForeach(gDvm.nativeLibs, findMethodInLib, |
| (void*) method); |
| } |
| |
| |
| static void appendValue(char type, const JValue value, char* buf, size_t n, |
| bool appendComma) |
| { |
| size_t len = strlen(buf); |
| if (len >= n - 32) { // 32 should be longer than anything we could append. |
| buf[len - 1] = '.'; |
| buf[len - 2] = '.'; |
| buf[len - 3] = '.'; |
| return; |
| } |
| char* p = buf + len; |
| switch (type) { |
| case 'B': |
| if (value.b >= 0 && value.b < 10) { |
| sprintf(p, "%d", value.b); |
| } else { |
| sprintf(p, "0x%x (%d)", value.b, value.b); |
| } |
| break; |
| case 'C': |
| if (value.c < 0x7f && value.c >= ' ') { |
| sprintf(p, "U+%x ('%c')", value.c, value.c); |
| } else { |
| sprintf(p, "U+%x", value.c); |
| } |
| break; |
| case 'D': |
| sprintf(p, "%g", value.d); |
| break; |
| case 'F': |
| sprintf(p, "%g", value.f); |
| break; |
| case 'I': |
| sprintf(p, "%d", value.i); |
| break; |
| case 'L': |
| sprintf(p, "0x%x", value.i); |
| break; |
| case 'J': |
| sprintf(p, "%lld", value.j); |
| break; |
| case 'S': |
| sprintf(p, "%d", value.s); |
| break; |
| case 'V': |
| strcpy(p, "void"); |
| break; |
| case 'Z': |
| strcpy(p, value.z ? "true" : "false"); |
| break; |
| default: |
| sprintf(p, "unknown type '%c'", type); |
| break; |
| } |
| |
| if (appendComma) { |
| strcat(p, ", "); |
| } |
| } |
| |
| #define LOGI_NATIVE(...) LOG(LOG_INFO, LOG_TAG "-native", __VA_ARGS__) |
| |
| void dvmLogNativeMethodEntry(const Method* method, const u4* args) |
| { |
| char thisString[32] = { 0 }; |
| const u4* sp = args; // &args[method->registersSize - method->insSize]; |
| if (!dvmIsStaticMethod(method)) { |
| sprintf(thisString, "this=0x%08x ", *sp++); |
| } |
| |
| char argsString[128]= { 0 }; |
| const char* desc = &method->shorty[1]; |
| while (*desc != '\0') { |
| char argType = *desc++; |
| JValue value; |
| if (argType == 'D' || argType == 'J') { |
| value.j = dvmGetArgLong(sp, 0); |
| sp += 2; |
| } else { |
| value.i = *sp++; |
| } |
| appendValue(argType, value, argsString, sizeof(argsString), |
| *desc != '\0'); |
| } |
| |
| char* signature = dexProtoCopyMethodDescriptor(&method->prototype); |
| LOGI_NATIVE("-> %s.%s%s %s(%s)", method->clazz->descriptor, method->name, |
| signature, thisString, argsString); |
| free(signature); |
| } |
| |
| void dvmLogNativeMethodExit(const Method* method, Thread* self, |
| const JValue returnValue) |
| { |
| char* signature = dexProtoCopyMethodDescriptor(&method->prototype); |
| if (dvmCheckException(self)) { |
| Object* exception = dvmGetException(self); |
| LOGI_NATIVE("<- %s.%s%s threw %s", method->clazz->descriptor, |
| method->name, signature, exception->clazz->descriptor); |
| } else { |
| char returnValueString[128] = { 0 }; |
| char returnType = method->shorty[0]; |
| appendValue(returnType, returnValue, |
| returnValueString, sizeof(returnValueString), false); |
| LOGI_NATIVE("<- %s.%s%s returned %s", method->clazz->descriptor, |
| method->name, signature, returnValueString); |
| } |
| free(signature); |
| } |