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fa597148b1f8 ·

native函數(shù)沒有指針數(shù)組哦，我看了一下android Q里邊的實(shí)現(xiàn)，在注冊(cè)native函數(shù)的時(shí)候，通過反射獲取到j(luò)ava方法地址后，直接將native 函數(shù)的地址，寫入到 對(duì)應(yīng)java 方法地址開始往后的4個(gè)字節(jié)或8個(gè)字節(jié)的內(nèi)存空間里邊。
具體實(shí)現(xiàn)在： android/art/runtime/art_method.h
template<typename T>
ALWAYS_INLINE void SetNativePointer(MemberOffset offset, T new_value, PointerSize pointer_size) {
static_assert(std::is_pointer<T>::value, "T must be a pointer type");
const auto addr = reinterpret_cast<uintptr_t>(this) + offset.Uint32Value();
///這邊將native函數(shù)地址進(jìn)行寫入哦
if (pointer_size == PointerSize::k32) {
uintptr_t ptr = reinterpret_cast<uintptr_t>(new_value);
*reinterpret_cast<uint32_t*>(addr) = dchecked_integral_cast<uint32_t>(ptr);
} else {
*reinterpret_cast<uint64_t*>(addr) = reinterpret_cast<uintptr_t>(new_value);
}
}

大致調(diào)用棧為：
SetNativePointer()
SetDataPtrSize()
SetEntryPointFromJniPtrSize()
SetEntryPointFromJni()
RegisterNative()
RegisterNatives()
jniRegisterNativeMethods()
registerNativeMethods()
RegisterMethodsOrDie()

1d9a81351590 評(píng)論自Android JNI(一)——NDK與JNI基礎(chǔ)