mirror of
https://github.com/mozilla/gecko-dev.git
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612 lines
26 KiB
Java
612 lines
26 KiB
Java
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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package org.mozilla.gecko.annotationProcessors;
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import org.mozilla.gecko.annotationProcessors.classloader.AnnotatableEntity;
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import org.mozilla.gecko.annotationProcessors.utils.Utils;
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import java.lang.annotation.Annotation;
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import java.lang.reflect.Constructor;
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import java.lang.reflect.Field;
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import java.lang.reflect.Member;
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import java.lang.reflect.Method;
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import java.util.HashMap;
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import java.util.HashSet;
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public class CodeGenerator {
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private static final Class<?>[] EMPTY_CLASS_ARRAY = new Class<?>[0];
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private static final Annotation[][] GETTER_ARGUMENT_ANNOTATIONS = new Annotation[0][0];
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private static final Annotation[][] SETTER_ARGUMENT_ANNOTATIONS = new Annotation[1][0];
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// Buffers holding the strings to ultimately be written to the output files.
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private final StringBuilder zeroingCode = new StringBuilder();
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private final StringBuilder wrapperStartupCode = new StringBuilder();
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private final StringBuilder wrapperMethodBodies = new StringBuilder();
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private final StringBuilder headerPublic = new StringBuilder();
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private final StringBuilder headerProtected = new StringBuilder();
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private final HashSet<String> seenClasses = new HashSet<String>();
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private final String mCClassName;
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private final Class<?> mClassToWrap;
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private boolean mHasEncounteredDefaultConstructor;
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// Used for creating unique names for method ID fields in the face of
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private final HashMap<Member, String> mMembersToIds = new HashMap<Member, String>();
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private final HashSet<String> mTakenMemberNames = new HashSet<String>();
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private int mNameMunger;
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public CodeGenerator(Class<?> aClass, String aGeneratedName) {
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mClassToWrap = aClass;
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mCClassName = aGeneratedName;
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// Write the file header things. Includes and so forth.
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// GeneratedJNIWrappers.cpp is generated as the concatenation of wrapperStartupCode with
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// wrapperMethodBodies. Similarly, GeneratedJNIWrappers.h is the concatenation of headerPublic
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// with headerProtected.
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wrapperStartupCode.append("void ").append(mCClassName).append("::InitStubs(JNIEnv *jEnv) {\n" +
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" initInit();\n");
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// Now we write the various GetStaticMethodID calls here...
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headerPublic.append("class ").append(mCClassName).append(" : public AutoGlobalWrappedJavaObject {\n" +
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"public:\n" +
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" static void InitStubs(JNIEnv *jEnv);\n");
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headerProtected.append("protected:");
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generateWrapperMethod();
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}
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/**
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* Emit a static method which takes an instance of the class being wrapped and returns an instance
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* of the C++ wrapper class backed by that object.
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*/
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private void generateWrapperMethod() {
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headerPublic.append(" static ").append(mCClassName).append("* Wrap(jobject obj);\n" +
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" ").append(mCClassName).append("(jobject obj, JNIEnv* env) : AutoGlobalWrappedJavaObject(obj, env) {};\n");
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wrapperMethodBodies.append("\n").append(mCClassName).append("* ").append(mCClassName).append("::Wrap(jobject obj) {\n" +
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" JNIEnv *env = GetJNIForThread();\n" +
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" ").append(mCClassName).append("* ret = new ").append(mCClassName).append("(obj, env);\n" +
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" env->DeleteLocalRef(obj);\n" +
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" return ret;\n" +
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"}\n");
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}
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private void generateMemberCommon(Member theMethod, String aCMethodName, Class<?> aClass) {
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ensureClassHeaderAndStartup(aClass);
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writeMemberIdField(theMethod, aCMethodName);
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writeStartupCode(theMethod);
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}
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/**
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* Append the appropriate generated code to the buffers for the method provided.
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*
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* @param aMethodTuple The Java method, plus annotation data.
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*/
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public void generateMethod(AnnotatableEntity aMethodTuple) {
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// Unpack the tuple and extract some useful fields from the Method..
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Method theMethod = aMethodTuple.getMethod();
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String CMethodName = aMethodTuple.mAnnotationInfo.wrapperName;
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generateMemberCommon(theMethod, CMethodName, mClassToWrap);
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boolean isFieldStatic = Utils.isMemberStatic(theMethod);
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Class<?>[] parameterTypes = theMethod.getParameterTypes();
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Class<?> returnType = theMethod.getReturnType();
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// Get the C++ method signature for this method.
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String implementationSignature = Utils.getCImplementationMethodSignature(parameterTypes, returnType, CMethodName, mCClassName, aMethodTuple.mAnnotationInfo.narrowChars);
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String headerSignature = Utils.getCHeaderMethodSignature(parameterTypes, theMethod.getParameterAnnotations(), returnType, CMethodName, mCClassName, isFieldStatic, aMethodTuple.mAnnotationInfo.narrowChars);
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// Add the header signature to the header file.
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writeSignatureToHeader(headerSignature);
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// Use the implementation signature to generate the method body...
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writeMethodBody(implementationSignature, theMethod, mClassToWrap,
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aMethodTuple.mAnnotationInfo.isMultithreaded,
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aMethodTuple.mAnnotationInfo.noThrow,
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aMethodTuple.mAnnotationInfo.narrowChars);
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}
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private void generateGetterOrSetterBody(Class<?> aFieldType, String aFieldName, boolean aIsFieldStatic, boolean isSetter, boolean aNarrowChars) {
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StringBuilder argumentContent = null;
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if (isSetter) {
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Class<?>[] setterArguments = new Class<?>[]{aFieldType};
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// Marshall the argument..
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argumentContent = getArgumentMarshalling(setterArguments);
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}
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boolean isObjectReturningMethod = Utils.isObjectType(aFieldType);
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wrapperMethodBodies.append(" ");
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if (isSetter) {
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wrapperMethodBodies.append("env->Set");
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} else {
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wrapperMethodBodies.append("return ");
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if (isObjectReturningMethod) {
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wrapperMethodBodies.append("static_cast<").append(Utils.getCReturnType(aFieldType, aNarrowChars)).append(">(");
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}
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wrapperMethodBodies.append("env->Get");
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}
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if (aIsFieldStatic) {
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wrapperMethodBodies.append("Static");
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}
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wrapperMethodBodies.append(Utils.getFieldType(aFieldType))
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.append("Field(");
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// Static will require the class and the field id. Nonstatic, the object and the field id.
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if (aIsFieldStatic) {
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wrapperMethodBodies.append(Utils.getClassReferenceName(mClassToWrap));
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} else {
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wrapperMethodBodies.append("wrapped_obj");
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}
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wrapperMethodBodies.append(", j")
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.append(aFieldName);
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if (isSetter) {
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wrapperMethodBodies.append(argumentContent);
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}
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if (!isSetter && isObjectReturningMethod) {
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wrapperMethodBodies.append(')');
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}
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wrapperMethodBodies.append(");\n" +
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"}\n");
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}
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public void generateField(AnnotatableEntity aFieldTuple) {
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Field theField = aFieldTuple.getField();
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// Handles a peculiar case when dealing with enum types. We don't care about this field.
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// It just gets in the way and stops our code from compiling.
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if (theField.getName().equals("$VALUES")) {
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return;
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}
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String CFieldName = aFieldTuple.mAnnotationInfo.wrapperName;
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Class<?> fieldType = theField.getType();
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generateMemberCommon(theField, CFieldName, mClassToWrap);
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boolean isFieldStatic = Utils.isMemberStatic(theField);
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boolean isFieldFinal = Utils.isMemberFinal(theField);
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String getterName = "get" + CFieldName;
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String getterSignature = Utils.getCImplementationMethodSignature(EMPTY_CLASS_ARRAY, fieldType, getterName, mCClassName, aFieldTuple.mAnnotationInfo.narrowChars);
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String getterHeaderSignature = Utils.getCHeaderMethodSignature(EMPTY_CLASS_ARRAY, GETTER_ARGUMENT_ANNOTATIONS, fieldType, getterName, mCClassName, isFieldStatic, aFieldTuple.mAnnotationInfo.narrowChars);
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writeSignatureToHeader(getterHeaderSignature);
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writeFunctionStartupBoilerPlate(getterSignature, true);
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generateGetterOrSetterBody(fieldType, CFieldName, isFieldStatic, false, aFieldTuple.mAnnotationInfo.narrowChars);
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// If field not final, also generate a setter function.
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if (!isFieldFinal) {
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String setterName = "set" + CFieldName;
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Class<?>[] setterArguments = new Class<?>[]{fieldType};
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String setterSignature = Utils.getCImplementationMethodSignature(setterArguments, Void.class, setterName, mCClassName, aFieldTuple.mAnnotationInfo.narrowChars);
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String setterHeaderSignature = Utils.getCHeaderMethodSignature(setterArguments, SETTER_ARGUMENT_ANNOTATIONS, Void.class, setterName, mCClassName, isFieldStatic, aFieldTuple.mAnnotationInfo.narrowChars);
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writeSignatureToHeader(setterHeaderSignature);
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writeFunctionStartupBoilerPlate(setterSignature, true);
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generateGetterOrSetterBody(fieldType, CFieldName, isFieldStatic, true, aFieldTuple.mAnnotationInfo.narrowChars);
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}
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}
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public void generateConstructor(AnnotatableEntity aCtorTuple) {
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// Unpack the tuple and extract some useful fields from the Method..
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Constructor<?> theCtor = aCtorTuple.getConstructor();
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String CMethodName = mCClassName;
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generateMemberCommon(theCtor, mCClassName, mClassToWrap);
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String implementationSignature = Utils.getCImplementationMethodSignature(theCtor.getParameterTypes(), Void.class, CMethodName, mCClassName, aCtorTuple.mAnnotationInfo.narrowChars);
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String headerSignature = Utils.getCHeaderMethodSignature(theCtor.getParameterTypes(), theCtor.getParameterAnnotations(), Void.class, CMethodName, mCClassName, false, aCtorTuple.mAnnotationInfo.narrowChars);
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// Slice off the "void " from the start of the constructor declaration.
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headerSignature = headerSignature.substring(5);
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implementationSignature = implementationSignature.substring(5);
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// Add the header signatures to the header file.
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writeSignatureToHeader(headerSignature);
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// Use the implementation signature to generate the method body...
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writeCtorBody(implementationSignature, theCtor,
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aCtorTuple.mAnnotationInfo.isMultithreaded,
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aCtorTuple.mAnnotationInfo.noThrow);
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if (theCtor.getParameterTypes().length == 0) {
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mHasEncounteredDefaultConstructor = true;
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}
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}
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/**
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* Writes the appropriate header and startup code to ensure the existence of a reference to the
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* class specified. If this is already done, does nothing.
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*
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* @param aClass The target class.
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*/
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private void ensureClassHeaderAndStartup(Class<?> aClass) {
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String className = aClass.getCanonicalName();
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if (seenClasses.contains(className)) {
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return;
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}
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zeroingCode.append("jclass ")
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.append(mCClassName)
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.append("::")
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.append(Utils.getClassReferenceName(aClass))
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.append(" = 0;\n");
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// Add a field to hold the reference...
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headerProtected.append("\n static jclass ")
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.append(Utils.getClassReferenceName(aClass))
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.append(";\n");
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// Add startup code to populate it..
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wrapperStartupCode.append('\n')
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.append(Utils.getStartupLineForClass(aClass));
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seenClasses.add(className);
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}
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/**
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* Writes code for getting the JNIEnv instance.
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*/
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private void writeFunctionStartupBoilerPlate(String methodSignature, boolean aIsThreaded) {
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// The start-of-function boilerplate. Does the bridge exist? Does the env exist? etc.
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wrapperMethodBodies.append('\n')
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.append(methodSignature)
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.append(" {\n");
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wrapperMethodBodies.append(" JNIEnv *env = ");
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if (!aIsThreaded) {
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wrapperMethodBodies.append("AndroidBridge::GetJNIEnv();\n");
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} else {
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wrapperMethodBodies.append("GetJNIForThread();\n");
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}
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}
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/**
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* Write out the appropriate JNI frame pushing boilerplate for a call to the member provided (
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* which must be a constructor or method).
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*
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* @param aMethod A constructor/method being wrapped.
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* @param aIsObjectReturningMethod Does the method being wrapped return an object?
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*/
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private void writeFramePushBoilerplate(Member aMethod,
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boolean aIsObjectReturningMethod, boolean aNoThrow) {
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if (aMethod instanceof Field) {
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throw new IllegalArgumentException("Tried to push frame for a FIELD?!");
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}
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Method m;
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Constructor<?> c;
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Class<?> returnType;
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int localReferencesNeeded;
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if (aMethod instanceof Method) {
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m = (Method) aMethod;
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returnType = m.getReturnType();
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localReferencesNeeded = Utils.enumerateReferenceArguments(m.getParameterTypes());
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} else {
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c = (Constructor<?>) aMethod;
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returnType = Void.class;
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localReferencesNeeded = Utils.enumerateReferenceArguments(c.getParameterTypes());
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}
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// Determine the number of local refs required for our local frame..
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// AutoLocalJNIFrame is not applicable here due to it's inability to handle return values.
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if (aIsObjectReturningMethod) {
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localReferencesNeeded++;
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}
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wrapperMethodBodies.append(
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" if (env->PushLocalFrame(").append(localReferencesNeeded).append(") != 0) {\n");
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if (!aNoThrow) {
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wrapperMethodBodies.append(
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" AndroidBridge::HandleUncaughtException(env);\n" +
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" MOZ_CRASH(\"Exception should have caused crash.\");\n");
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} else {
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wrapperMethodBodies.append(
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" return").append(Utils.getFailureReturnForType(returnType)).append(";\n");
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}
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wrapperMethodBodies.append(
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" }\n\n");
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}
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private StringBuilder getArgumentMarshalling(Class<?>[] argumentTypes) {
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StringBuilder argumentContent = new StringBuilder();
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// If we have >2 arguments, use the jvalue[] calling approach.
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argumentContent.append(", ");
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if (argumentTypes.length > 2) {
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wrapperMethodBodies.append(" jvalue args[").append(argumentTypes.length).append("];\n");
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for (int aT = 0; aT < argumentTypes.length; aT++) {
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wrapperMethodBodies.append(" args[").append(aT).append("].")
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.append(Utils.getArrayArgumentMashallingLine(argumentTypes[aT], "a" + aT));
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}
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// The only argument is the array of arguments.
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argumentContent.append("args");
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wrapperMethodBodies.append('\n');
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} else {
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// Otherwise, use the vanilla calling approach.
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boolean needsNewline = false;
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for (int aT = 0; aT < argumentTypes.length; aT++) {
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// If the argument is a string-esque type, create a jstring from it, otherwise
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// it can be passed directly.
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if (Utils.isCharSequence(argumentTypes[aT])) {
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wrapperMethodBodies.append(" jstring j").append(aT).append(" = AndroidBridge::NewJavaString(env, a").append(aT).append(");\n");
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needsNewline = true;
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// Ensure we refer to the newly constructed Java string - not to the original
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// parameter to the wrapper function.
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argumentContent.append('j').append(aT);
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} else {
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argumentContent.append('a').append(aT);
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}
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if (aT != argumentTypes.length - 1) {
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argumentContent.append(", ");
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}
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}
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if (needsNewline) {
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wrapperMethodBodies.append('\n');
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}
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}
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return argumentContent;
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}
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private void writeCtorBody(String implementationSignature, Constructor<?> theCtor,
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boolean aIsThreaded, boolean aNoThrow) {
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Class<?>[] argumentTypes = theCtor.getParameterTypes();
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writeFunctionStartupBoilerPlate(implementationSignature, aIsThreaded);
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writeFramePushBoilerplate(theCtor, false, aNoThrow);
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// Marshall arguments for this constructor, if any...
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boolean hasArguments = argumentTypes.length != 0;
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StringBuilder argumentContent = new StringBuilder();
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if (hasArguments) {
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argumentContent = getArgumentMarshalling(argumentTypes);
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}
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// The call into Java
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wrapperMethodBodies.append(" Init(env->NewObject");
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if (argumentTypes.length > 2) {
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wrapperMethodBodies.append('A');
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}
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wrapperMethodBodies.append('(');
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// Call takes class id, method id of constructor method, then arguments.
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wrapperMethodBodies.append(Utils.getClassReferenceName(mClassToWrap)).append(", ");
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wrapperMethodBodies.append(mMembersToIds.get(theCtor))
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// Tack on the arguments, if any..
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.append(argumentContent)
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.append("), env);\n" +
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" env->PopLocalFrame(nullptr);\n" +
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"}\n");
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}
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/**
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* Generates the method body of the C++ wrapper function for the Java method indicated.
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*
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* @param methodSignature The previously-generated C++ method signature for the method to be
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* generated.
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* @param aMethod The Java method to be wrapped by the C++ method being generated.
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* @param aClass The Java class to which the method belongs.
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*/
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private void writeMethodBody(String methodSignature, Method aMethod,
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Class<?> aClass, boolean aIsMultithreaded,
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boolean aNoThrow, boolean aNarrowChars) {
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Class<?>[] argumentTypes = aMethod.getParameterTypes();
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Class<?> returnType = aMethod.getReturnType();
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writeFunctionStartupBoilerPlate(methodSignature, aIsMultithreaded);
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boolean isObjectReturningMethod = !returnType.getCanonicalName().equals("void") && Utils.isObjectType(returnType);
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writeFramePushBoilerplate(aMethod, isObjectReturningMethod, aNoThrow);
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// Marshall arguments, if we have any.
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boolean hasArguments = argumentTypes.length != 0;
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// We buffer the arguments to the call separately to avoid needing to repeatedly iterate the
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// argument list while building this line. In the coming code block, we simultaneously
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// construct any argument marshalling code (Creation of jstrings, placement of arguments
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// into an argument array, etc. and the actual argument list passed to the function (in
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// argumentContent).
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StringBuilder argumentContent = new StringBuilder();
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if (hasArguments) {
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argumentContent = getArgumentMarshalling(argumentTypes);
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}
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// Allocate a temporary variable to hold the return type from Java.
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wrapperMethodBodies.append(" ");
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if (!returnType.getCanonicalName().equals("void")) {
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if (isObjectReturningMethod) {
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wrapperMethodBodies.append("jobject");
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} else {
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wrapperMethodBodies.append(Utils.getCReturnType(returnType, aNarrowChars));
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}
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wrapperMethodBodies.append(" temp = ");
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}
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boolean isStaticJavaMethod = Utils.isMemberStatic(aMethod);
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// The call into Java
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wrapperMethodBodies.append("env->")
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.append(Utils.getCallPrefix(returnType, isStaticJavaMethod));
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if (argumentTypes.length > 2) {
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wrapperMethodBodies.append('A');
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}
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wrapperMethodBodies.append('(');
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// If the underlying Java method is nonstatic, we provide the target object to the JNI.
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if (!isStaticJavaMethod) {
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wrapperMethodBodies.append("wrapped_obj, ");
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} else {
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// If this is a static underlying Java method, we need to use the class reference in our
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// call.
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wrapperMethodBodies.append(Utils.getClassReferenceName(aClass)).append(", ");
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}
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wrapperMethodBodies.append(mMembersToIds.get(aMethod));
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// Tack on the arguments, if any..
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wrapperMethodBodies.append(argumentContent)
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.append(");\n");
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// Check for exception and crash if any...
|
|
if (!aNoThrow) {
|
|
wrapperMethodBodies.append(" AndroidBridge::HandleUncaughtException(env);\n");
|
|
}
|
|
|
|
// If we're returning an object, pop the callee's stack frame extracting our ref as the return
|
|
// value.
|
|
if (isObjectReturningMethod) {
|
|
wrapperMethodBodies.append(" ")
|
|
.append(Utils.getCReturnType(returnType, aNarrowChars))
|
|
.append(" ret = static_cast<").append(Utils.getCReturnType(returnType, aNarrowChars)).append(">(env->PopLocalFrame(temp));\n" +
|
|
" return ret;\n");
|
|
} else if (!returnType.getCanonicalName().equals("void")) {
|
|
// If we're a primitive-returning function, just return the directly-obtained primative
|
|
// from the call to Java.
|
|
wrapperMethodBodies.append(" env->PopLocalFrame(nullptr);\n" +
|
|
" return temp;\n");
|
|
} else {
|
|
// If we don't return anything, just pop the stack frame and move on with life.
|
|
wrapperMethodBodies.append(" env->PopLocalFrame(nullptr);\n");
|
|
}
|
|
wrapperMethodBodies.append("}\n");
|
|
}
|
|
|
|
/**
|
|
* Generates the code to get the id of the given member on startup.
|
|
*
|
|
* @param aMember The Java member being wrapped.
|
|
*/
|
|
private void writeStartupCode(Member aMember) {
|
|
wrapperStartupCode.append(" ")
|
|
.append(mMembersToIds.get(aMember))
|
|
.append(" = get");
|
|
if (Utils.isMemberStatic(aMember)) {
|
|
wrapperStartupCode.append("Static");
|
|
}
|
|
|
|
boolean isField = aMember instanceof Field;
|
|
if (isField) {
|
|
wrapperStartupCode.append("Field(\"");
|
|
} else {
|
|
wrapperStartupCode.append("Method(\"");
|
|
}
|
|
if (aMember instanceof Constructor) {
|
|
wrapperStartupCode.append("<init>");
|
|
} else {
|
|
wrapperStartupCode.append(aMember.getName());
|
|
}
|
|
|
|
wrapperStartupCode.append("\", \"")
|
|
.append(Utils.getTypeSignatureStringForMember(aMember))
|
|
.append("\");\n");
|
|
}
|
|
|
|
private void writeZeroingFor(Member aMember, final String aMemberName) {
|
|
if (aMember instanceof Field) {
|
|
zeroingCode.append("jfieldID ");
|
|
} else {
|
|
zeroingCode.append("jmethodID ");
|
|
}
|
|
zeroingCode.append(mCClassName)
|
|
.append("::")
|
|
.append(aMemberName)
|
|
.append(" = 0;\n");
|
|
}
|
|
|
|
/**
|
|
* Write the field declaration for the C++ id field of the given member.
|
|
*
|
|
* @param aMember Member for which an id field needs to be generated.
|
|
*/
|
|
private void writeMemberIdField(Member aMember, final String aCMethodName) {
|
|
String memberName = 'j'+ aCMethodName;
|
|
|
|
if (aMember instanceof Field) {
|
|
headerProtected.append(" static jfieldID ");
|
|
} else {
|
|
headerProtected.append(" static jmethodID ");
|
|
}
|
|
|
|
while(mTakenMemberNames.contains(memberName)) {
|
|
memberName = 'j' + aCMethodName + mNameMunger;
|
|
mNameMunger++;
|
|
}
|
|
|
|
writeZeroingFor(aMember, memberName);
|
|
mMembersToIds.put(aMember, memberName);
|
|
mTakenMemberNames.add(memberName);
|
|
|
|
headerProtected.append(memberName)
|
|
.append(";\n");
|
|
}
|
|
|
|
/**
|
|
* Helper function to add a provided method signature to the public section of the generated header.
|
|
*
|
|
* @param aSignature The header to add.
|
|
*/
|
|
private void writeSignatureToHeader(String aSignature) {
|
|
headerPublic.append(" ")
|
|
.append(aSignature)
|
|
.append(";\n");
|
|
}
|
|
|
|
/**
|
|
* Get the finalised bytes to go into the generated wrappers file.
|
|
*
|
|
* @return The bytes to be written to the wrappers file.
|
|
*/
|
|
public String getWrapperFileContents() {
|
|
wrapperStartupCode.append("}\n");
|
|
zeroingCode.append(wrapperStartupCode)
|
|
.append(wrapperMethodBodies);
|
|
wrapperMethodBodies.setLength(0);
|
|
wrapperStartupCode.setLength(0);
|
|
return zeroingCode.toString();
|
|
}
|
|
|
|
/**
|
|
* Get the finalised bytes to go into the generated header file.
|
|
*
|
|
* @return The bytes to be written to the header file.
|
|
*/
|
|
public String getHeaderFileContents() {
|
|
if (!mHasEncounteredDefaultConstructor) {
|
|
headerPublic.append(" ").append(mCClassName).append("() : AutoGlobalWrappedJavaObject() {};\n");
|
|
}
|
|
headerProtected.append("};\n\n");
|
|
headerPublic.append(headerProtected);
|
|
headerProtected.setLength(0);
|
|
return headerPublic.toString();
|
|
}
|
|
}
|