| // Copyright 2014 The Chromium Authors |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef JNI_ZERO_JNI_ZERO_HELPER_H_ |
| #define JNI_ZERO_JNI_ZERO_HELPER_H_ |
| |
| #include <jni.h> |
| |
| #include "base/android/jni_android.h" |
| #include "base/android/scoped_java_ref.h" |
| #include "base/compiler_specific.h" |
| #include "base/memory/raw_ptr.h" |
| #if defined(USE_CHROMIUM_BASE) |
| // Used for ARCH_CPU_X86 - embedder must define this correctly if they want |
| // 16-byte stack alignment on x86. |
| #include "build/build_config.h" |
| #endif // defined(USE_CHROMIUM_BASE) |
| #include "third_party/jni_zero/jni_export.h" |
| #include "third_party/jni_zero/jni_int_wrapper.h" |
| #include "third_party/jni_zero/logging.h" |
| |
| // Project-specific macros used by the header files generated by |
| // jni_generator.py. Different projects can then specify their own |
| // implementation for this file. |
| #define CHECK_NATIVE_PTR(env, jcaller, native_ptr, method_name, ...) \ |
| JNI_ZERO_DCHECK(native_ptr); |
| |
| #define CHECK_CLAZZ(env, jcaller, clazz, ...) JNI_ZERO_DCHECK(clazz); |
| |
| namespace jni_generator { |
| |
| inline void HandleRegistrationError(JNIEnv* env, |
| jclass clazz, |
| const char* filename) { |
| JNI_ZERO_ELOG("RegisterNatives failed in %s", filename); |
| } |
| |
| inline void CheckException(JNIEnv* env) { |
| base::android::CheckException(env); |
| } |
| |
| // A 32 bit number could be an address on stack. Random 64 bit marker on the |
| // stack is much less likely to be present on stack. |
| constexpr uint64_t kJniStackMarkerValue = 0xbdbdef1bebcade1b; |
| |
| // Context about the JNI call with exception checked to be stored in stack. |
| struct JNI_ZERO_COMPONENT_BUILD_EXPORT JniJavaCallContextUnchecked { |
| ALWAYS_INLINE JniJavaCallContextUnchecked() { |
| // TODO(ssid): Implement for other architectures. |
| #if defined(__arm__) || defined(__aarch64__) |
| // This assumes that this method does not increment the stack pointer. |
| asm volatile("mov %0, sp" : "=r"(sp)); |
| #else |
| sp = 0; |
| #endif |
| } |
| |
| // Force no inline to reduce code size. |
| template <base::android::MethodID::Type type> |
| NOINLINE void Init(JNIEnv* env, |
| jclass clazz, |
| const char* method_name, |
| const char* jni_signature, |
| std::atomic<jmethodID>* atomic_method_id) { |
| env1 = env; |
| |
| // Make sure compiler doesn't optimize out the assignment. |
| memcpy(&marker, &kJniStackMarkerValue, sizeof(kJniStackMarkerValue)); |
| // Gets PC of the calling function. |
| pc = reinterpret_cast<uintptr_t>(__builtin_return_address(0)); |
| |
| method_id = base::android::MethodID::LazyGet<type>( |
| env, clazz, method_name, jni_signature, atomic_method_id); |
| } |
| |
| NOINLINE ~JniJavaCallContextUnchecked() { |
| // Reset so that spurious marker finds are avoided. |
| memset(&marker, 0, sizeof(marker)); |
| } |
| |
| uint64_t marker; |
| uintptr_t sp; |
| uintptr_t pc; |
| |
| raw_ptr<JNIEnv> env1; |
| jmethodID method_id; |
| }; |
| |
| // Context about the JNI call with exception unchecked to be stored in stack. |
| struct JNI_ZERO_COMPONENT_BUILD_EXPORT JniJavaCallContextChecked { |
| // Force no inline to reduce code size. |
| template <base::android::MethodID::Type type> |
| NOINLINE void Init(JNIEnv* env, |
| jclass clazz, |
| const char* method_name, |
| const char* jni_signature, |
| std::atomic<jmethodID>* atomic_method_id) { |
| base.Init<type>(env, clazz, method_name, jni_signature, atomic_method_id); |
| // Reset |pc| to correct caller. |
| base.pc = reinterpret_cast<uintptr_t>(__builtin_return_address(0)); |
| } |
| |
| NOINLINE ~JniJavaCallContextChecked() { |
| jni_generator::CheckException(base.env1); |
| } |
| |
| JniJavaCallContextUnchecked base; |
| }; |
| |
| static_assert(sizeof(JniJavaCallContextChecked) == |
| sizeof(JniJavaCallContextUnchecked), |
| "Stack unwinder cannot work with structs of different sizes."); |
| |
| } // namespace jni_generator |
| |
| #endif // JNI_ZERO_JNI_ZERO_HELPER_H_ |