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org.jetbrains.kotlin.codegen.inline.AnonymousObjectTransformer Maven / Gradle / Ivy
/*
* Copyright 2010-2015 JetBrains s.r.o.
*
* 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.
*/
package org.jetbrains.kotlin.codegen.inline;
import com.intellij.util.ArrayUtil;
import kotlin.jvm.functions.Function0;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.kotlin.codegen.AsmUtil;
import org.jetbrains.kotlin.codegen.ClassBuilder;
import org.jetbrains.kotlin.codegen.FieldInfo;
import org.jetbrains.kotlin.codegen.StackValue;
import org.jetbrains.kotlin.codegen.state.GenerationState;
import org.jetbrains.kotlin.codegen.state.JetTypeMapper;
import org.jetbrains.org.objectweb.asm.*;
import org.jetbrains.org.objectweb.asm.commons.InstructionAdapter;
import org.jetbrains.org.objectweb.asm.tree.*;
import java.util.*;
import static org.jetbrains.kotlin.codegen.inline.InlineCodegenUtil.isThis0;
import static org.jetbrains.kotlin.resolve.jvm.diagnostics.JvmDeclarationOrigin.NO_ORIGIN;
public class AnonymousObjectTransformer {
protected final GenerationState state;
protected final JetTypeMapper typeMapper;
private final InlineResult transformationResult;
private MethodNode constructor;
private String sourceInfo;
private String debugInfo;
private SourceMapper sourceMapper;
private final InliningContext inliningContext;
private final Type oldObjectType;
private final Type newLambdaType;
private final ClassReader reader;
private final boolean isSameModule;
private final Map> fieldNames = new HashMap>();
public AnonymousObjectTransformer(
@NotNull String objectInternalName,
@NotNull InliningContext inliningContext,
boolean isSameModule,
@NotNull Type newLambdaType
) {
this.isSameModule = isSameModule;
this.state = inliningContext.state;
this.typeMapper = state.getTypeMapper();
this.inliningContext = inliningContext;
this.oldObjectType = Type.getObjectType(objectInternalName);
this.newLambdaType = newLambdaType;
reader = InlineCodegenUtil.buildClassReaderByInternalName(state, objectInternalName);
transformationResult = InlineResult.create();
}
@NotNull
public InlineResult doTransform(@NotNull AnonymousObjectGeneration anonymousObjectGen, @NotNull FieldRemapper parentRemapper) {
final List innerClassNodes = new ArrayList();
ClassBuilder classBuilder = createClassBuilder();
final List methodsToTransform = new ArrayList();
reader.accept(new ClassVisitor(InlineCodegenUtil.API, classBuilder.getVisitor()) {
@Override
public void visit(int version, int access, @NotNull String name, String signature, String superName, String[] interfaces) {
InlineCodegenUtil.assertVersionNotGreaterThanJava6(version, name);
super.visit(version, access, name, signature, superName, interfaces);
}
@Override
public void visitInnerClass(@NotNull String name, String outerName, String innerName, int access) {
innerClassNodes.add(new InnerClassNode(name, outerName, innerName, access));
}
@Override
public MethodVisitor visitMethod(
int access, @NotNull String name, @NotNull String desc, String signature, String[] exceptions
) {
MethodNode node = new MethodNode(access, name, desc, signature, exceptions);
if (name.equals("")){
if (constructor != null)
throw new RuntimeException("Lambda, SAM or anonymous object should have only one constructor");
constructor = node;
} else {
methodsToTransform.add(node);
}
return node;
}
@Override
public FieldVisitor visitField(
int access, @NotNull String name, @NotNull String desc, String signature, Object value
) {
addUniqueField(name);
if (InlineCodegenUtil.isCapturedFieldName(name)) {
return null;
} else {
return super.visitField(access, name, desc, signature, value);
}
}
@Override
public void visitSource(String source, String debug) {
sourceInfo = source;
debugInfo = debug;
}
@Override
public void visitEnd() {
}
}, ClassReader.SKIP_FRAMES);
if (!inliningContext.isInliningLambda) {
if (debugInfo != null && !debugInfo.isEmpty()) {
sourceMapper = SourceMapper.Companion.createFromSmap(SMAPParser.parse(debugInfo));
}
else {
//seems we can't do any clever mapping cause we don't know any about original class name
sourceMapper = IdenticalSourceMapper.INSTANCE;
}
if (sourceInfo != null && !InlineCodegenUtil.GENERATE_SMAP) {
classBuilder.visitSource(sourceInfo, debugInfo);
}
}
else {
if (sourceInfo != null) {
classBuilder.visitSource(sourceInfo, debugInfo);
}
sourceMapper = IdenticalSourceMapper.INSTANCE;
}
ParametersBuilder allCapturedParamBuilder = ParametersBuilder.newBuilder();
ParametersBuilder constructorParamBuilder = ParametersBuilder.newBuilder();
List additionalFakeParams =
extractParametersMappingAndPatchConstructor(constructor, allCapturedParamBuilder, constructorParamBuilder,
anonymousObjectGen, parentRemapper);
List deferringMethods = new ArrayList();
for (MethodNode next : methodsToTransform) {
MethodVisitor deferringVisitor = newMethod(classBuilder, next);
InlineResult funResult =
inlineMethodAndUpdateGlobalResult(anonymousObjectGen, parentRemapper, deferringVisitor, next, allCapturedParamBuilder, false);
Type returnType = Type.getReturnType(next.desc);
if (!AsmUtil.isPrimitive(returnType)) {
String oldFunReturnType = returnType.getInternalName();
String newFunReturnType = funResult.getChangedTypes().get(oldFunReturnType);
if (newFunReturnType != null) {
inliningContext.typeRemapper.addAdditionalMappings(oldFunReturnType, newFunReturnType);
}
}
deferringMethods.add(deferringVisitor);
}
for (MethodVisitor method : deferringMethods) {
method.visitEnd();
}
generateConstructorAndFields(classBuilder, allCapturedParamBuilder, constructorParamBuilder, anonymousObjectGen, parentRemapper, additionalFakeParams);
SourceMapper.Companion.flushToClassBuilder(sourceMapper, classBuilder);
ClassVisitor visitor = classBuilder.getVisitor();
for (InnerClassNode node : innerClassNodes) {
visitor.visitInnerClass(node.name, node.outerName, node.innerName, node.access);
}
writeOuterInfo(visitor);
classBuilder.done();
anonymousObjectGen.setNewLambdaType(newLambdaType);
return transformationResult;
}
private void writeOuterInfo(@NotNull ClassVisitor visitor) {
InlineCallSiteInfo info = inliningContext.getCallSiteInfo();
visitor.visitOuterClass(info.getOwnerClassName(), info.getFunctionName(), info.getFunctionDesc());
}
@NotNull
private InlineResult inlineMethodAndUpdateGlobalResult(
@NotNull AnonymousObjectGeneration anonymousObjectGen,
@NotNull FieldRemapper parentRemapper,
@NotNull MethodVisitor deferringVisitor,
@NotNull MethodNode next,
@NotNull ParametersBuilder allCapturedParamBuilder,
boolean isConstructor
) {
InlineResult funResult = inlineMethod(anonymousObjectGen, parentRemapper, deferringVisitor, next, allCapturedParamBuilder, isConstructor);
transformationResult.addAllClassesToRemove(funResult);
transformationResult.getReifiedTypeParametersUsages().mergeAll(funResult.getReifiedTypeParametersUsages());
return funResult;
}
@NotNull
private InlineResult inlineMethod(
@NotNull AnonymousObjectGeneration anonymousObjectGen,
@NotNull FieldRemapper parentRemapper,
@NotNull MethodVisitor deferringVisitor,
@NotNull MethodNode sourceNode,
@NotNull ParametersBuilder capturedBuilder,
boolean isConstructor
) {
ReifiedTypeParametersUsages typeParametersToReify = inliningContext.reifedTypeInliner.reifyInstructions(sourceNode);
Parameters parameters = isConstructor ? capturedBuilder.buildParameters() : getMethodParametersWithCaptured(capturedBuilder, sourceNode);
RegeneratedLambdaFieldRemapper remapper =
new RegeneratedLambdaFieldRemapper(oldObjectType.getInternalName(), newLambdaType.getInternalName(),
parameters, anonymousObjectGen.getCapturedLambdasToInline(),
parentRemapper, isConstructor);
MethodInliner inliner =
new MethodInliner(
sourceNode,
parameters,
inliningContext.subInline(inliningContext.nameGenerator.subGenerator("lambda")),
remapper,
isSameModule,
"Transformer for " + anonymousObjectGen.getOwnerInternalName(),
sourceMapper,
new InlineCallSiteInfo(
anonymousObjectGen.getOwnerInternalName(),
sourceNode.name,
isConstructor ? anonymousObjectGen.getNewConstructorDescriptor() : sourceNode.desc)
);
InlineResult result = inliner.doInline(deferringVisitor, new LocalVarRemapper(parameters, 0), false, LabelOwner.NOT_APPLICABLE);
result.getReifiedTypeParametersUsages().mergeAll(typeParametersToReify);
deferringVisitor.visitMaxs(-1, -1);
return result;
}
private void generateConstructorAndFields(
@NotNull ClassBuilder classBuilder,
@NotNull ParametersBuilder allCapturedBuilder,
@NotNull ParametersBuilder constructorInlineBuilder,
@NotNull AnonymousObjectGeneration anonymousObjectGen,
@NotNull FieldRemapper parentRemapper,
@NotNull List constructorAdditionalFakeParams
) {
List descTypes = new ArrayList();
Parameters constructorParams = constructorInlineBuilder.buildParameters();
int [] capturedIndexes = new int [constructorParams.getReal().size() + constructorParams.getCaptured().size()];
int index = 0;
int size = 0;
//complex processing cause it could have super constructor call params
for (ParameterInfo info : constructorParams) {
if (!info.isSkipped()) { //not inlined
if (info.isCaptured() || info instanceof CapturedParamInfo) {
capturedIndexes[index] = size;
index++;
}
if (size != 0) { //skip this
descTypes.add(info.getType());
}
size += info.getType().getSize();
}
}
String constructorDescriptor = Type.getMethodDescriptor(Type.VOID_TYPE, descTypes.toArray(new Type[descTypes.size()]));
//TODO for inline method make public class
anonymousObjectGen.setNewConstructorDescriptor(constructorDescriptor);
MethodVisitor constructorVisitor = classBuilder.newMethod(NO_ORIGIN,
AsmUtil.NO_FLAG_PACKAGE_PRIVATE,
"", constructorDescriptor,
null, ArrayUtil.EMPTY_STRING_ARRAY);
//initialize captured fields
List newFieldsWithSkipped = TransformationUtilsKt.getNewFieldsToGenerate(allCapturedBuilder.listCaptured());
List fieldInfoWithSkipped = TransformationUtilsKt.transformToFieldInfo(newLambdaType, newFieldsWithSkipped);
int paramIndex = 0;
InstructionAdapter capturedFieldInitializer = new InstructionAdapter(constructorVisitor);
for (int i = 0; i < fieldInfoWithSkipped.size(); i++) {
FieldInfo fieldInfo = fieldInfoWithSkipped.get(i);
if (!newFieldsWithSkipped.get(i).getSkip()) {
AsmUtil.genAssignInstanceFieldFromParam(fieldInfo, capturedIndexes[paramIndex], capturedFieldInitializer);
}
paramIndex++;
}
//then transform constructor
//HACK: in inlinining into constructor we access original captured fields with field access not local var
//but this fields added to general params (this assumes local var access) not captured one,
//so we need to add them to captured params
for (CapturedParamInfo info : constructorAdditionalFakeParams) {
CapturedParamInfo fake = constructorInlineBuilder.addCapturedParamCopy(info);
if (fake.getLambda() != null) {
//set remap value to skip this fake (captured with lambda already skipped)
StackValue composed = StackValue.field(fake.getType(),
oldObjectType,
fake.getNewFieldName(),
false,
StackValue.LOCAL_0);
fake.setRemapValue(composed);
}
}
inlineMethodAndUpdateGlobalResult(anonymousObjectGen, parentRemapper, capturedFieldInitializer, constructor, constructorInlineBuilder, true);
constructorVisitor.visitEnd();
AsmUtil.genClosureFields(TransformationUtilsKt.toNameTypePair(TransformationUtilsKt.filterSkipped(newFieldsWithSkipped)), classBuilder);
}
@NotNull
private Parameters getMethodParametersWithCaptured(
@NotNull ParametersBuilder capturedBuilder,
@NotNull MethodNode sourceNode
) {
ParametersBuilder builder = ParametersBuilder.initializeBuilderFrom(oldObjectType, sourceNode.desc);
for (CapturedParamInfo param : capturedBuilder.listCaptured()) {
builder.addCapturedParamCopy(param);
}
return builder.buildParameters();
}
@NotNull
private ClassBuilder createClassBuilder() {
ClassBuilder classBuilder = state.getFactory().newVisitor(NO_ORIGIN, newLambdaType, inliningContext.getRoot().callElement.getContainingFile());
return new RemappingClassBuilder(
classBuilder,
new AsmTypeRemapper(inliningContext.typeRemapper, inliningContext.getRoot().typeParameterMappings == null, transformationResult)
);
}
@NotNull
private static DeferredMethodVisitor newMethod(@NotNull final ClassBuilder builder, @NotNull final MethodNode original) {
return new DeferredMethodVisitor(
new MethodNode(original.access,
original.name,
original.desc,
original.signature,
ArrayUtil.toStringArray(original.exceptions)),
new Function0() {
@Override
public MethodVisitor invoke() {
return builder.newMethod(
NO_ORIGIN,
original.access,
original.name,
original.desc,
original.signature,
ArrayUtil.toStringArray(original.exceptions));
}
});
}
private List extractParametersMappingAndPatchConstructor(
@NotNull MethodNode constructor,
@NotNull ParametersBuilder capturedParamBuilder,
@NotNull ParametersBuilder constructorParamBuilder,
@NotNull final AnonymousObjectGeneration anonymousObjectGen,
@NotNull FieldRemapper parentFieldRemapper
) {
CapturedParamOwner owner = new CapturedParamOwner() {
@Override
public Type getType() {
return Type.getObjectType(anonymousObjectGen.getOwnerInternalName());
}
};
Set capturedLambdas = new LinkedHashSet(); //captured var of inlined parameter
List constructorAdditionalFakeParams = new ArrayList();
Map indexToLambda = anonymousObjectGen.getLambdasToInline();
Set capturedParams = new HashSet();
//load captured parameters and patch instruction list (NB: there is also could be object fields)
AbstractInsnNode cur = constructor.instructions.getFirst();
while (cur != null) {
if (cur instanceof FieldInsnNode) {
FieldInsnNode fieldNode = (FieldInsnNode) cur;
String fieldName = fieldNode.name;
if (fieldNode.getOpcode() == Opcodes.PUTFIELD && InlineCodegenUtil.isCapturedFieldName(fieldName)) {
boolean isPrevVarNode = fieldNode.getPrevious() instanceof VarInsnNode;
boolean isPrevPrevVarNode = isPrevVarNode && fieldNode.getPrevious().getPrevious() instanceof VarInsnNode;
if (isPrevPrevVarNode) {
VarInsnNode node = (VarInsnNode) fieldNode.getPrevious().getPrevious();
if (node.var == 0) {
VarInsnNode previous = (VarInsnNode) fieldNode.getPrevious();
int varIndex = previous.var;
LambdaInfo lambdaInfo = indexToLambda.get(varIndex);
String newFieldName = isThis0(fieldName) && shouldRenameThis0(parentFieldRemapper, indexToLambda.values()) ? getNewFieldName(fieldName, true) : fieldName;
CapturedParamInfo info = capturedParamBuilder.addCapturedParam(owner, fieldName, newFieldName, Type.getType(fieldNode.desc), lambdaInfo != null, null);
if (lambdaInfo != null) {
info.setLambda(lambdaInfo);
capturedLambdas.add(lambdaInfo);
}
constructorAdditionalFakeParams.add(info);
capturedParams.add(varIndex);
constructor.instructions.remove(previous.getPrevious());
constructor.instructions.remove(previous);
AbstractInsnNode temp = cur;
cur = cur.getNext();
constructor.instructions.remove(temp);
continue;
}
}
}
}
cur = cur.getNext();
}
constructorParamBuilder.addThis(oldObjectType, false);
String constructorDesc = anonymousObjectGen.getConstructorDesc();
if (constructorDesc == null) {
// in case of anonymous object with empty closure
constructorDesc = Type.getMethodDescriptor(Type.VOID_TYPE);
}
Type [] types = Type.getArgumentTypes(constructorDesc);
for (Type type : types) {
LambdaInfo info = indexToLambda.get(constructorParamBuilder.getNextValueParameterIndex());
ParameterInfo parameterInfo = constructorParamBuilder.addNextParameter(type, info != null, null);
parameterInfo.setLambda(info);
if (capturedParams.contains(parameterInfo.getIndex())) {
parameterInfo.setCaptured(true);
} else {
//otherwise it's super constructor parameter
}
}
//For all inlined lambdas add their captured parameters
//TODO: some of such parameters could be skipped - we should perform additional analysis
Map capturedLambdasToInline = new HashMap(); //captured var of inlined parameter
List allRecapturedParameters = new ArrayList();
boolean addCapturedNotAddOuter = parentFieldRemapper.isRoot() || (parentFieldRemapper instanceof InlinedLambdaRemapper && parentFieldRemapper.getParent().isRoot());
Map alreadyAdded = new HashMap();
for (LambdaInfo info : capturedLambdas) {
if (addCapturedNotAddOuter) {
for (CapturedParamDesc desc : info.getCapturedVars()) {
String key = desc.getFieldName() + "$$$" + desc.getType().getClassName();
CapturedParamInfo alreadyAddedParam = alreadyAdded.get(key);
CapturedParamInfo recapturedParamInfo = capturedParamBuilder.addCapturedParam(
desc,
alreadyAddedParam != null ? alreadyAddedParam.getNewFieldName() : getNewFieldName(desc.getFieldName(), false));
StackValue composed = StackValue.field(desc.getType(),
oldObjectType, /*TODO owner type*/
recapturedParamInfo.getNewFieldName(),
false,
StackValue.LOCAL_0);
recapturedParamInfo.setRemapValue(composed);
allRecapturedParameters.add(desc);
constructorParamBuilder.addCapturedParam(recapturedParamInfo, recapturedParamInfo.getNewFieldName()).setRemapValue(composed);
if (alreadyAddedParam != null) {
recapturedParamInfo.setSkipInConstructor(true);
}
if (isThis0(desc.getFieldName())) {
alreadyAdded.put(key, recapturedParamInfo);
}
}
}
capturedLambdasToInline.put(info.getLambdaClassType().getInternalName(), info);
}
if (parentFieldRemapper instanceof InlinedLambdaRemapper && !capturedLambdas.isEmpty() && !addCapturedNotAddOuter) {
//lambda with non InlinedLambdaRemapper already have outer
FieldRemapper parent = parentFieldRemapper.getParent();
assert parent instanceof RegeneratedLambdaFieldRemapper;
final Type ownerType = Type.getObjectType(parent.getLambdaInternalName());
CapturedParamDesc desc = new CapturedParamDesc(new CapturedParamOwner() {
@Override
public Type getType() {
return ownerType;
}
}, InlineCodegenUtil.THIS, ownerType);
CapturedParamInfo recapturedParamInfo = capturedParamBuilder.addCapturedParam(desc, InlineCodegenUtil.THIS$0/*outer lambda/object*/);
StackValue composed = StackValue.LOCAL_0;
recapturedParamInfo.setRemapValue(composed);
allRecapturedParameters.add(desc);
constructorParamBuilder.addCapturedParam(recapturedParamInfo, recapturedParamInfo.getNewFieldName()).setRemapValue(composed);
}
anonymousObjectGen.setAllRecapturedParameters(allRecapturedParameters);
anonymousObjectGen.setCapturedLambdasToInline(capturedLambdasToInline);
return constructorAdditionalFakeParams;
}
private static boolean shouldRenameThis0(@NotNull FieldRemapper parentFieldRemapper, Collection values) {
if (isFirstDeclSiteLambdaFieldRemapper(parentFieldRemapper)) {
for (LambdaInfo value : values) {
for (CapturedParamDesc desc : value.getCapturedVars()) {
if (isThis0(desc.getFieldName())) {
return true;
}
}
}
}
return false;
}
@NotNull
public String getNewFieldName(@NotNull String oldName, boolean originalField) {
if (InlineCodegenUtil.THIS$0.equals(oldName)) {
if (!originalField) {
return oldName;
} else {
//rename original 'this$0' in declaration site lambda (inside inline function) to use this$0 only for outer lambda/object access on call site
return addUniqueField(oldName + InlineCodegenUtil.INLINE_FUN_THIS_0_SUFFIX);
}
}
return addUniqueField(oldName + InlineCodegenUtil.INLINE_TRANSFORMATION_SUFFIX);
}
@NotNull
private String addUniqueField(@NotNull String name) {
List existNames = fieldNames.get(name);
if (existNames == null) {
existNames = new LinkedList();
fieldNames.put(name, existNames);
}
String suffix = existNames.isEmpty() ? "" : "$" + existNames.size();
String newName = name + suffix;
existNames.add(newName);
return newName;
}
private static boolean isFirstDeclSiteLambdaFieldRemapper(FieldRemapper parentRemapper) {
return !(parentRemapper instanceof RegeneratedLambdaFieldRemapper) && !(parentRemapper instanceof InlinedLambdaRemapper);
}
}
