113 lines
4.2 KiB
C++
113 lines
4.2 KiB
C++
/*
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* Copyright (C) 2016 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "java_lang_reflect_Parameter.h"
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#include "android-base/stringprintf.h"
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#include "nativehelper/jni_macros.h"
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#include "art_method-inl.h"
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#include "base/utils.h"
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#include "common_throws.h"
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#include "dex/dex_file-inl.h"
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#include "dex/dex_file_annotations.h"
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#include "jni/jni_internal.h"
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#include "native_util.h"
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#include "scoped_fast_native_object_access-inl.h"
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namespace art {
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using android::base::StringPrintf;
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static jobject Parameter_getAnnotationNative(JNIEnv* env,
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jclass,
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jobject javaMethod,
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jint parameterIndex,
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jclass annotationType) {
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ScopedFastNativeObjectAccess soa(env);
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if (UNLIKELY(javaMethod == nullptr)) {
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ThrowNullPointerException("javaMethod == null");
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return nullptr;
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}
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ArtMethod* method = ArtMethod::FromReflectedMethod(soa, javaMethod);
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if (method->IsProxyMethod()) {
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return nullptr;
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}
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uint32_t parameter_count = method->GetParameterTypeList()->Size();
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if (UNLIKELY(parameterIndex < 0 || static_cast<uint32_t>(parameterIndex) >= parameter_count)) {
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ThrowIllegalArgumentException(
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StringPrintf("Illegal parameterIndex %d for %s, parameter_count is %d",
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parameterIndex,
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method->PrettyMethod().c_str(),
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parameter_count).c_str());
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return nullptr;
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}
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uint32_t annotated_parameter_count = annotations::GetNumberOfAnnotatedMethodParameters(method);
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if (annotated_parameter_count == 0u) {
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return nullptr;
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}
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// For constructors with implicit arguments, we may need to adjust
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// annotation positions based on whether the implicit parameters are
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// expected to known and not just a compiler implementation detail.
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if (method->IsConstructor()) {
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StackHandleScope<1> hs(soa.Self());
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// If declaring class is a local or an enum, do not pad parameter
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// annotations, as the implicit constructor parameters are an
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// implementation detail rather than required by JLS.
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Handle<mirror::Class> declaring_class = hs.NewHandle(method->GetDeclaringClass());
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if (annotations::GetEnclosingMethod(declaring_class) == nullptr && !declaring_class->IsEnum()) {
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// Adjust the parameter index if the number of annotations does
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// not match the number of parameters.
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if (annotated_parameter_count <= parameter_count) {
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// Workaround for dexer not inserting annotation state for implicit parameters (b/68033708).
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uint32_t skip_count = parameter_count - annotated_parameter_count;
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DCHECK_GE(2u, skip_count);
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if (parameterIndex < static_cast<jint>(skip_count)) {
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return nullptr;
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}
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parameterIndex -= skip_count;
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} else {
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// Workaround for Jack erroneously inserting implicit parameter for local classes
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// (b/68033708).
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DCHECK_EQ(1u, annotated_parameter_count - parameter_count);
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parameterIndex += static_cast<jint>(annotated_parameter_count - parameter_count);
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}
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}
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}
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StackHandleScope<1> hs(soa.Self());
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Handle<mirror::Class> klass(hs.NewHandle(soa.Decode<mirror::Class>(annotationType)));
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return soa.AddLocalReference<jobject>(
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annotations::GetAnnotationForMethodParameter(method, parameterIndex, klass));
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}
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static JNINativeMethod gMethods[] = {
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FAST_NATIVE_METHOD(
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Parameter,
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getAnnotationNative,
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"(Ljava/lang/reflect/Executable;ILjava/lang/Class;)Ljava/lang/annotation/Annotation;"),
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};
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void register_java_lang_reflect_Parameter(JNIEnv* env) {
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REGISTER_NATIVE_METHODS("java/lang/reflect/Parameter");
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}
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} // namespace art
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