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
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
|
/*******************************************************************************
* Copyright (c) 2000, 2012 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
* $Id: Block.java 23404 2010-02-03 14:10:22Z stephan $
*
* Contributors:
* IBM Corporation - initial API and implementation
* Fraunhofer FIRST - extended API and implementation
* Technical University Berlin - extended API and implementation
* Stephan Herrmann - Contributions for
* bug 349326 - [1.7] new warning for missing try-with-resources
* bug 368546 - [compiler][resource] Avoid remaining false positives found when compiling the Eclipse SDK
* bug 345305 - [compiler][null] Compiler misidentifies a case of "variable can only be null"
* bug 383368 - [compiler][null] syntactic null analysis for field references
*******************************************************************************/
package org.eclipse.jdt.internal.compiler.ast;
import org.eclipse.jdt.internal.compiler.ASTVisitor;
import org.eclipse.jdt.internal.compiler.codegen.*;
import org.eclipse.jdt.internal.compiler.flow.*;
import org.eclipse.jdt.internal.compiler.lookup.*;
import org.eclipse.objectteams.otdt.internal.core.compiler.control.Config;
import org.eclipse.objectteams.otdt.internal.core.compiler.statemachine.transformer.InsertTypeAdjustmentsVisitor;
/**
* OTDT changes:
*
* What: trigger substitutions required for type adjustment etc.
* How: call InsertTypeAdjustmentsVisitor and CollectedReplacementsVisitor
*
* @version $Id: Block.java 23404 2010-02-03 14:10:22Z stephan $
*/
public class Block extends Statement {
public Statement[] statements;
public int explicitDeclarations;
// the number of explicit declaration , used to create scope
public BlockScope scope;
public Block(int explicitDeclarations) {
this.explicitDeclarations = explicitDeclarations;
}
public FlowInfo analyseCode(BlockScope currentScope, FlowContext flowContext, FlowInfo flowInfo) {
// empty block
if (this.statements == null) return flowInfo;
int complaintLevel = (flowInfo.reachMode() & FlowInfo.UNREACHABLE) != 0 ? Statement.COMPLAINED_FAKE_REACHABLE : Statement.NOT_COMPLAINED;
boolean enableSyntacticNullAnalysisForFields = currentScope.compilerOptions().enableSyntacticNullAnalysisForFields;
for (int i = 0, max = this.statements.length; i < max; i++) {
Statement stat = this.statements[i];
if ((complaintLevel = stat.complainIfUnreachable(flowInfo, this.scope, complaintLevel, true)) < Statement.COMPLAINED_UNREACHABLE) {
flowInfo = stat.analyseCode(this.scope, flowContext, flowInfo);
}
// record the effect of stat on the finally block of an enclosing try-finally, if any:
if (flowContext.initsOnFinally != null)
flowContext.mergeFinallyNullInfo(flowInfo);
if (enableSyntacticNullAnalysisForFields) {
flowContext.expireNullCheckedFieldInfo();
}
}
if (this.explicitDeclarations > 0) {
// if block has its own scope analyze tracking vars now:
this.scope.checkUnclosedCloseables(flowInfo, flowContext, null, null);
// cleanup assignment info for locals that are scoped to this block:
LocalVariableBinding[] locals = this.scope.locals;
if (locals != null) {
int numLocals = this.scope.localIndex;
for (int i = 0; i < numLocals; i++) {
flowInfo.resetAssignmentInfo(locals[i]);
}
}
}
return flowInfo;
}
/**
* Code generation for a block
*/
public void generateCode(BlockScope currentScope, CodeStream codeStream) {
if ((this.bits & IsReachable) == 0) {
return;
}
int pc = codeStream.position;
if (this.statements != null) {
for (int i = 0, max = this.statements.length; i < max; i++) {
this.statements[i].generateCode(this.scope, codeStream);
}
} // for local variable debug attributes
if (this.scope != currentScope) { // was really associated with its own scope
codeStream.exitUserScope(this.scope);
}
codeStream.recordPositionsFrom(pc, this.sourceStart);
}
public boolean isEmptyBlock() {
return this.statements == null;
}
public StringBuffer printBody(int indent, StringBuffer output) {
if (this.statements == null) return output;
for (int i = 0; i < this.statements.length; i++) {
this.statements[i].printStatement(indent + 1, output);
output.append('\n');
}
return output;
}
public StringBuffer printStatement(int indent, StringBuffer output) {
printIndent(indent, output);
output.append("{\n"); //$NON-NLS-1$
printBody(indent, output);
return printIndent(indent, output).append('}');
}
public void resolve(BlockScope upperScope) {
if ((this.bits & UndocumentedEmptyBlock) != 0) {
upperScope.problemReporter().undocumentedEmptyBlock(this.sourceStart, this.sourceEnd);
}
if (this.statements != null) {
//{ObjectTeams: make safe for re-try (keep existing local variables):
if (this.scope == null)
//SH}
this.scope =
this.explicitDeclarations == 0
? upperScope
: new BlockScope(upperScope, this.explicitDeclarations);
//{ObjectTeams: use InsertTypeAdjustmentsVisitor:
Config oldConfig = Config.createOrResetConfig(this);
try {
//orig:
for (int i = 0, length = this.statements.length; i < length; i++) {
this.statements[i].resolve(this.scope);
// :giro
if ( Config.requireTypeAdjustment()
&& !this.scope.problemReporter().referenceContext.hasErrors())
{
this.statements[i].traverse(new InsertTypeAdjustmentsVisitor(), this.scope);
}
//orig:
}
// :giro
} finally {
Config.removeOrRestore(oldConfig, this);
}
//SH}
}
}
public void resolveUsing(BlockScope givenScope) {
if ((this.bits & UndocumentedEmptyBlock) != 0) {
givenScope.problemReporter().undocumentedEmptyBlock(this.sourceStart, this.sourceEnd);
}
// this optimized resolve(...) is sent only on none empty blocks
this.scope = givenScope;
if (this.statements != null) {
//{ObjectTeams: prepare Config:
Config oldConfig = Config.createOrResetConfig(this);
try {
//SH}
for (int i = 0, length = this.statements.length; i < length; i++) {
this.statements[i].resolve(this.scope);
//{ObjectTeams: resolving statements might have detected some ast nodes that need adjustment
if ( Config.requireTypeAdjustment()
&& !this.scope.problemReporter().referenceContext.hasErrors())
{
this.statements[i].traverse(new InsertTypeAdjustmentsVisitor(), this.scope);
}
//orig:
}
// :giro
} finally {
Config.removeOrRestore(oldConfig, this);
}
//SH}
}
}
public void traverse(ASTVisitor visitor, BlockScope blockScope) {
if (visitor.visit(this, blockScope)) {
if (this.statements != null) {
for (int i = 0, length = this.statements.length; i < length; i++)
this.statements[i].traverse(visitor, this.scope);
}
}
visitor.endVisit(this, blockScope);
}
/**
* Dispatch the call on its last statement.
*/
public void branchChainTo(BranchLabel label) {
if (this.statements != null) {
this.statements[this.statements.length - 1].branchChainTo(label);
}
}
}
|
