1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
|
/*
* Copyright 2000-2014 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 com.intellij.codeInspection.dataFlow.value;
import com.intellij.codeInspection.dataFlow.DfaPsiUtil;
import com.intellij.codeInspection.dataFlow.Nullness;
import com.intellij.openapi.diagnostic.Logger;
import com.intellij.openapi.util.Condition;
import com.intellij.openapi.util.registry.Registry;
import com.intellij.psi.*;
import com.intellij.psi.impl.JavaConstantExpressionEvaluator;
import com.intellij.psi.util.PropertyUtil;
import com.intellij.psi.util.PsiUtil;
import com.intellij.util.containers.ContainerUtil;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import java.util.Map;
import java.util.regex.Pattern;
/**
* @author peter
*/
public class DfaExpressionFactory {
private static final Logger LOG = Logger.getInstance("#com.intellij.codeInspection.dataFlow.value.DfaExpressionFactory");
private static final Condition<String> FALSE_GETTERS = parseFalseGetters();
private static Condition<String> parseFalseGetters() {
try {
final Pattern pattern = Pattern.compile(Registry.stringValue("ide.dfa.getters.with.side.effects"));
return new Condition<String>() {
@Override
public boolean value(String s) {
return pattern.matcher(s).matches();
}
};
}
catch (Exception e) {
LOG.error(e);
//noinspection unchecked
return Condition.FALSE;
}
}
private final DfaValueFactory myFactory;
private Map<Integer, PsiVariable> myMockIndices = ContainerUtil.newHashMap();
public DfaExpressionFactory(DfaValueFactory factory) {
myFactory = factory;
}
@Nullable
public DfaValue getExpressionDfaValue(@Nullable PsiExpression expression) {
if (expression == null) return null;
if (expression instanceof PsiParenthesizedExpression) {
return getExpressionDfaValue(((PsiParenthesizedExpression)expression).getExpression());
}
if (expression instanceof PsiArrayAccessExpression) {
PsiExpression arrayExpression = ((PsiArrayAccessExpression)expression).getArrayExpression();
DfaValue qualifier = getExpressionDfaValue(arrayExpression);
if (qualifier instanceof DfaVariableValue) {
PsiVariable indexVar = getArrayIndexVariable(((PsiArrayAccessExpression)expression).getIndexExpression());
if (indexVar != null) {
return myFactory.getVarFactory().createVariableValue(indexVar, expression.getType(), false, (DfaVariableValue)qualifier);
}
}
return null;
}
if (expression instanceof PsiMethodCallExpression) {
return createReferenceValue(((PsiMethodCallExpression)expression).getMethodExpression());
}
if (expression instanceof PsiReferenceExpression) {
return createReferenceValue((PsiReferenceExpression)expression);
}
if (expression instanceof PsiLiteralExpression) {
return myFactory.createLiteralValue((PsiLiteralExpression)expression);
}
if (expression instanceof PsiNewExpression) {
return myFactory.createTypeValue(expression.getType(), Nullness.NOT_NULL);
}
final Object value = JavaConstantExpressionEvaluator.computeConstantExpression(expression, false);
PsiType type = expression.getType();
if (value != null && type != null) {
if (value instanceof String) {
return myFactory.createTypeValue(type, Nullness.NOT_NULL); // Non-null string literal.
}
return myFactory.getConstFactory().createFromValue(value, type, null);
}
return null;
}
private DfaValue createReferenceValue(@NotNull PsiReferenceExpression refExpr) {
PsiModifierListOwner var = getAccessedVariableOrGetter(refExpr.resolve());
if (var == null) {
return null;
}
if (!var.hasModifierProperty(PsiModifier.VOLATILE) && !var.hasModifierProperty(PsiModifier.TRANSIENT)) {
if (var instanceof PsiVariable && var.hasModifierProperty(PsiModifier.FINAL)) {
DfaValue constValue = myFactory.getConstFactory().create((PsiVariable)var);
if (constValue != null) return constValue;
}
if (DfaValueFactory.isEffectivelyUnqualified(refExpr)) {
return myFactory.getVarFactory().createVariableValue(var, refExpr.getType(), false, null);
}
DfaValue qualifierValue = getExpressionDfaValue(refExpr.getQualifierExpression());
if (qualifierValue instanceof DfaVariableValue) {
return myFactory.getVarFactory().createVariableValue(var, refExpr.getType(), false, (DfaVariableValue)qualifierValue);
}
}
PsiType type = refExpr.getType();
return myFactory.createTypeValue(type, DfaPsiUtil.getElementNullability(type, var));
}
@Nullable
private static PsiModifierListOwner getAccessedVariableOrGetter(final PsiElement target) {
if (target instanceof PsiVariable) {
return (PsiVariable)target;
}
if (target instanceof PsiMethod) {
if (PropertyUtil.isSimplePropertyGetter((PsiMethod)target)) {
String qName = PsiUtil.getMemberQualifiedName((PsiMethod)target);
if (qName == null || !FALSE_GETTERS.value(qName)) {
return (PsiMethod)target;
}
}
}
return null;
}
@Nullable
private PsiVariable getArrayIndexVariable(@Nullable PsiExpression indexExpression) {
Object constant = JavaConstantExpressionEvaluator.computeConstantExpression(indexExpression, false);
if (constant instanceof Integer && ((Integer)constant).intValue() >= 0) {
PsiVariable mockVar = myMockIndices.get(constant);
if (mockVar == null) {
mockVar = JavaPsiFacade.getElementFactory(indexExpression.getProject()).createField("$array$index$" + constant, PsiType.INT);
myMockIndices.put((Integer)constant, mockVar);
}
return mockVar;
}
return null;
}
}
|
