001 /*
002 * Copyright 2010-2015 JetBrains s.r.o.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 * http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016
017 package org.jetbrains.kotlin.resolve.inline;
018
019 import org.jetbrains.annotations.NotNull;
020 import org.jetbrains.annotations.Nullable;
021 import org.jetbrains.kotlin.descriptors.*;
022 import org.jetbrains.kotlin.diagnostics.Errors;
023 import org.jetbrains.kotlin.psi.*;
024 import org.jetbrains.kotlin.resolve.BindingTrace;
025 import org.jetbrains.kotlin.resolve.DescriptorUtils;
026 import org.jetbrains.kotlin.resolve.FunctionAnalyzerExtension;
027 import org.jetbrains.kotlin.types.JetType;
028
029 import java.util.List;
030
031 public class InlineAnalyzerExtension implements FunctionAnalyzerExtension.AnalyzerExtension {
032
033 public static final InlineAnalyzerExtension INSTANCE = new InlineAnalyzerExtension();
034
035 private InlineAnalyzerExtension() {
036 }
037
038 @Override
039 public void process(
040 @NotNull final FunctionDescriptor descriptor, @NotNull JetNamedFunction function, @NotNull final BindingTrace trace
041 ) {
042 assert InlineUtil.isInline(descriptor) : "This method should be invoked on inline function: " + descriptor;
043
044 checkDefaults(descriptor, function, trace);
045 checkNotVirtual(descriptor, function, trace);
046 checkHasInlinableAndNullability(descriptor, function, trace);
047
048 JetVisitorVoid visitor = new JetVisitorVoid() {
049 @Override
050 public void visitJetElement(@NotNull JetElement element) {
051 super.visitJetElement(element);
052 element.acceptChildren(this);
053 }
054
055 @Override
056 public void visitClass(@NotNull JetClass klass) {
057 trace.report(Errors.NOT_YET_SUPPORTED_IN_INLINE.on(klass, klass, descriptor));
058 }
059
060 @Override
061 public void visitNamedFunction(@NotNull JetNamedFunction function) {
062 if (function.getParent().getParent() instanceof JetObjectDeclaration) {
063 super.visitNamedFunction(function);
064 } else {
065 trace.report(Errors.NOT_YET_SUPPORTED_IN_INLINE.on(function, function, descriptor));
066 }
067 }
068 };
069
070 function.acceptChildren(visitor);
071 }
072
073 private static void checkDefaults(
074 @NotNull FunctionDescriptor functionDescriptor,
075 @NotNull JetFunction function,
076 @NotNull BindingTrace trace
077 ) {
078 int index = 0;
079 List<JetParameter> jetParameters = function.getValueParameters();
080 for (ValueParameterDescriptor parameter : functionDescriptor.getValueParameters()) {
081 if (parameter.hasDefaultValue()) {
082 JetParameter jetParameter = jetParameters.get(index);
083 //report not supported default only on inlinable lambda and on parameter with inherited default (there is some problems to inline it)
084 if (checkInlinableParameter(parameter, jetParameter, functionDescriptor, null) || !parameter.declaresDefaultValue()) {
085 trace.report(Errors.NOT_YET_SUPPORTED_IN_INLINE.on(jetParameter, jetParameter, functionDescriptor));
086 }
087 }
088 index++;
089 }
090 }
091
092 private static void checkNotVirtual(
093 @NotNull FunctionDescriptor functionDescriptor,
094 @NotNull JetFunction function,
095 @NotNull BindingTrace trace
096 ) {
097 if (Visibilities.isPrivate(functionDescriptor.getVisibility()) || functionDescriptor.getModality() == Modality.FINAL) {
098 return;
099 }
100
101 if (functionDescriptor.getContainingDeclaration() instanceof PackageFragmentDescriptor) {
102 return;
103 }
104
105 trace.report(Errors.DECLARATION_CANT_BE_INLINED.on(function));
106 }
107
108
109 private static void checkHasInlinableAndNullability(
110 @NotNull FunctionDescriptor functionDescriptor,
111 @NotNull JetFunction function,
112 @NotNull BindingTrace trace
113 ) {
114 boolean hasInlinable = false;
115 List<ValueParameterDescriptor> parameters = functionDescriptor.getValueParameters();
116 int index = 0;
117 for (ValueParameterDescriptor parameter : parameters) {
118 hasInlinable |= checkInlinableParameter(parameter, function.getValueParameters().get(index++), functionDescriptor, trace);
119 }
120 ReceiverParameterDescriptor receiverParameter = functionDescriptor.getExtensionReceiverParameter();
121 if (receiverParameter != null) {
122 JetTypeReference receiver = function.getReceiverTypeReference();
123 assert receiver != null : "Descriptor has a receiver but psi doesn't " + function.getText();
124 hasInlinable |= checkInlinableParameter(receiverParameter, receiver, functionDescriptor, trace);
125 }
126
127 hasInlinable |= DescriptorUtils.containsReifiedTypeParameters(functionDescriptor);
128
129 if (!hasInlinable) {
130 trace.report(Errors.NOTHING_TO_INLINE.on(function, functionDescriptor));
131 }
132 }
133
134 public static boolean checkInlinableParameter(
135 @NotNull ParameterDescriptor parameter,
136 @NotNull JetElement expression,
137 @NotNull CallableDescriptor functionDescriptor,
138 @Nullable BindingTrace trace
139 ) {
140 if (InlineUtil.isInlineLambdaParameter(parameter)) {
141 if (parameter.getType().isMarkedNullable()) {
142 if (trace != null) {
143 trace.report(Errors.NULLABLE_INLINE_PARAMETER.on(expression, expression, functionDescriptor));
144 }
145 }
146 else {
147 return true;
148 }
149 }
150 return false;
151 }
152 }