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 com.intellij.psi.PsiElement;
020 import org.jetbrains.annotations.NotNull;
021 import org.jetbrains.annotations.Nullable;
022 import org.jetbrains.kotlin.descriptors.*;
023 import org.jetbrains.kotlin.diagnostics.Errors;
024 import org.jetbrains.kotlin.lexer.KtTokens;
025 import org.jetbrains.kotlin.psi.*;
026 import org.jetbrains.kotlin.resolve.BindingTrace;
027 import org.jetbrains.kotlin.resolve.FunctionAnalyzerExtension;
028 import org.jetbrains.kotlin.resolve.annotations.AnnotationUtilKt;
029 import org.jetbrains.kotlin.resolve.descriptorUtil.DescriptorUtilsKt;
030
031 import java.util.List;
032
033 public class InlineAnalyzerExtension implements FunctionAnalyzerExtension.AnalyzerExtension {
034
035 public static final InlineAnalyzerExtension INSTANCE = new InlineAnalyzerExtension();
036
037 private InlineAnalyzerExtension() {
038 }
039
040 @Override
041 public void process(
042 @NotNull final FunctionDescriptor descriptor, @NotNull KtNamedFunction function, @NotNull final BindingTrace trace
043 ) {
044 assert InlineUtil.isInline(descriptor) : "This method should be invoked on inline function: " + descriptor;
045
046 checkDefaults(descriptor, function, trace);
047 checkNotVirtual(descriptor, function, trace);
048 checkHasInlinableAndNullability(descriptor, function, trace);
049
050 KtVisitorVoid visitor = new KtVisitorVoid() {
051 @Override
052 public void visitKtElement(@NotNull KtElement element) {
053 super.visitKtElement(element);
054 element.acceptChildren(this);
055 }
056
057 @Override
058 public void visitClass(@NotNull KtClass klass) {
059 trace.report(Errors.NOT_YET_SUPPORTED_IN_INLINE.on(klass, klass, descriptor));
060 }
061
062 @Override
063 public void visitNamedFunction(@NotNull KtNamedFunction function) {
064 if (function.getParent().getParent() instanceof KtObjectDeclaration) {
065 super.visitNamedFunction(function);
066 } else {
067 trace.report(Errors.NOT_YET_SUPPORTED_IN_INLINE.on(function, function, descriptor));
068 }
069 }
070 };
071
072 function.acceptChildren(visitor);
073 }
074
075 private static void checkDefaults(
076 @NotNull FunctionDescriptor functionDescriptor,
077 @NotNull KtFunction function,
078 @NotNull BindingTrace trace
079 ) {
080 List<KtParameter> jetParameters = function.getValueParameters();
081 for (ValueParameterDescriptor parameter : functionDescriptor.getValueParameters()) {
082 if (DescriptorUtilsKt.hasDefaultValue(parameter)) {
083 KtParameter jetParameter = jetParameters.get(parameter.getIndex());
084 //report not supported default only on inlinable lambda and on parameter with inherited default (there is some problems to inline it)
085 if (checkInlinableParameter(parameter, jetParameter, functionDescriptor, null) || !parameter.declaresDefaultValue()) {
086 trace.report(Errors.NOT_YET_SUPPORTED_IN_INLINE.on(jetParameter, jetParameter, functionDescriptor));
087 }
088 }
089 }
090 }
091
092 private static void checkNotVirtual(
093 @NotNull FunctionDescriptor functionDescriptor,
094 @NotNull KtFunction 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 KtFunction 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
121 hasInlinable |= InlineUtil.containsReifiedTypeParameters(functionDescriptor);
122
123 if (!hasInlinable && !AnnotationUtilKt.isInlineOnly(functionDescriptor)) {
124 KtModifierList modifierList = function.getModifierList();
125 PsiElement inlineModifier = modifierList == null ? null : modifierList.getModifier(KtTokens.INLINE_KEYWORD);
126 PsiElement reportOn = inlineModifier == null ? function : inlineModifier;
127 trace.report(Errors.NOTHING_TO_INLINE.on(reportOn, functionDescriptor));
128 }
129 }
130
131 public static boolean checkInlinableParameter(
132 @NotNull ParameterDescriptor parameter,
133 @NotNull KtElement expression,
134 @NotNull CallableDescriptor functionDescriptor,
135 @Nullable BindingTrace trace
136 ) {
137 if (InlineUtil.isInlineLambdaParameter(parameter)) {
138 if (parameter.getType().isMarkedNullable()) {
139 if (trace != null) {
140 trace.report(Errors.NULLABLE_INLINE_PARAMETER.on(expression, expression, functionDescriptor));
141 }
142 }
143 else {
144 return true;
145 }
146 }
147 return false;
148 }
149 }