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
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
|
/*******************************************************************************
* Copyright (c) 2008 Wind River Systems, Inc. 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
*
* Contributors:
* Markus Schorn - initial API and implementation
*******************************************************************************/
package org.eclipse.cdt.internal.core.parser.scanner;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.eclipse.cdt.core.dom.ast.IASTFileLocation;
import org.eclipse.cdt.core.dom.ast.IASTName;
import org.eclipse.cdt.core.dom.ast.IASTPreprocessorMacroDefinition;
import org.eclipse.cdt.core.dom.ast.IASTPreprocessorMacroExpansion;
import org.eclipse.cdt.core.dom.ast.IASTTranslationUnit;
import org.eclipse.cdt.core.dom.ast.IBinding;
import org.eclipse.cdt.core.dom.ast.IMacroBinding;
import org.eclipse.cdt.core.dom.rewrite.MacroExpansionExplorer;
import org.eclipse.jface.text.IRegion;
import org.eclipse.text.edits.ReplaceEdit;
/**
* Delegates the task of exploring macro expansions to simpler explorers dealing with
* a single macro, only.
* @since 5.0
*/
public class MultiMacroExpansionExplorer extends MacroExpansionExplorer {
private static final class ASTFileLocation implements IASTFileLocation {
private final String fFilePath;
private final int fOffset;
private final int fLength;
private ASTFileLocation(String filePath, int offset, int length) {
fFilePath= filePath;
fOffset= offset;
fLength= length;
}
public int getNodeOffset() {return fOffset;}
public int getNodeLength() {return fLength;}
public String getFileName() {return fFilePath;}
public int getStartingLineNumber() {return 0;}
public int getEndingLineNumber() {return 0;}
public IASTFileLocation asFileLocation() {return this;}
}
private final char[] fSource;
private final int[] fBoundaries;
private final SingleMacroExpansionExplorer[] fDelegates;
private final String fFilePath;
private final Map<IMacroBinding, IASTFileLocation> fMacroLocations;
private MacroExpansionStep fCachedStep;
private int fCachedStepID= -1;
public MultiMacroExpansionExplorer(IASTTranslationUnit tu, IASTFileLocation loc) {
if (tu == null || loc == null || loc.getNodeLength() == 0) {
throw new IllegalArgumentException();
}
final ILocationResolver resolver = getResolver(tu);
final IASTPreprocessorMacroExpansion[] expansions= resolver.getMacroExpansions(loc);
final int count= expansions.length;
loc = extendLocation(loc, expansions);
fMacroLocations= getMacroLocations(resolver);
fFilePath= tu.getFilePath();
fSource= resolver.getUnpreprocessedSignature(loc);
fBoundaries= new int[count*2+1];
fDelegates= new SingleMacroExpansionExplorer[count];
final int firstOffset= loc.getNodeOffset();
int bidx= -1;
int didx= -1;
for (IASTPreprocessorMacroExpansion expansion : expansions) {
IASTName ref= expansion.getMacroReference();
if (ref != null) {
ArrayList<IASTName> refs= new ArrayList<IASTName>();
refs.add(ref);
refs.addAll(Arrays.asList(expansion.getNestedMacroReferences()));
IASTFileLocation refLoc= expansion.getFileLocation();
int from= refLoc.getNodeOffset()-firstOffset;
int to= from+refLoc.getNodeLength();
fBoundaries[++bidx]= from;
fBoundaries[++bidx]= to;
fDelegates[++didx]= new SingleMacroExpansionExplorer(new String(fSource, from, to-from),
refs.toArray(new IASTName[refs.size()]), fMacroLocations,
fFilePath, refLoc.getStartingLineNumber());
}
}
fBoundaries[++bidx]= fSource.length;
}
private ILocationResolver getResolver(IASTTranslationUnit tu) {
final ILocationResolver resolver = (ILocationResolver) tu.getAdapter(ILocationResolver.class);
if (resolver == null) {
throw new IllegalArgumentException();
}
return resolver;
}
private IASTFileLocation extendLocation(IASTFileLocation loc, final IASTPreprocessorMacroExpansion[] expansions) {
final int count= expansions.length;
if (count > 0) {
int from= loc.getNodeOffset();
int to= from+loc.getNodeLength();
final int lfrom = expansions[0].getFileLocation().getNodeOffset();
final IASTFileLocation l= expansions[count-1].getFileLocation();
final int lto= l.getNodeOffset() + l.getNodeLength();
if (lfrom < from || lto > to) {
from= Math.min(from, lfrom);
to= Math.max(to, lto);
loc= new ASTFileLocation(loc.getFileName(), from, to-from);
}
}
return loc;
}
private Map<IMacroBinding, IASTFileLocation> getMacroLocations(final ILocationResolver resolver) {
final Map<IMacroBinding, IASTFileLocation> result= new HashMap<IMacroBinding, IASTFileLocation>();
addLocations(resolver.getBuiltinMacroDefinitions(), result);
addLocations(resolver.getMacroDefinitions(), result);
return result;
}
private void addLocations(IASTPreprocessorMacroDefinition[] defs,
final Map<IMacroBinding, IASTFileLocation> result) {
for (IASTPreprocessorMacroDefinition def : defs) {
IASTName name= def.getName();
if (name != null) {
IASTFileLocation loc= name.getFileLocation();
if (loc != null) {
final IBinding binding= name.getBinding();
if (binding instanceof IMacroBinding) {
loc= new ASTFileLocation(loc.getFileName(), loc.getNodeOffset(), loc.getNodeLength());
result.put((IMacroBinding) binding, loc);
}
}
}
}
}
public MultiMacroExpansionExplorer(final IASTTranslationUnit tu, final IRegion loc) {
this(tu, new ASTFileLocation(tu.getFilePath(), loc.getOffset(), loc.getLength()));
}
@Override
public IMacroExpansionStep getFullExpansion() {
List<ReplaceEdit> edits = combineReplaceEdits(fDelegates.length);
return new MacroExpansionStep(new String(fSource), null, null, edits.toArray(new ReplaceEdit[edits.size()]));
}
/**
* Combines the replace edits of the leading delegates.
*/
private List<ReplaceEdit> combineReplaceEdits(int count) {
ArrayList<ReplaceEdit> edits= new ArrayList<ReplaceEdit>();
for (int i=0; i < count; i++) {
IMacroExpansionStep step= fDelegates[i].getFullExpansion();
shiftAndAddEdits(fBoundaries[2*i], step.getReplacements(), edits);
}
return edits;
}
/**
* Shifts and adds the replace edits to the target list.
*/
private void shiftAndAddEdits(final int shift, ReplaceEdit[] stepEdits, List<ReplaceEdit> target) {
for (int j = 0; j < stepEdits.length; j++) {
final ReplaceEdit r = stepEdits[j];
final String rtext = r.getText();
target.add(new ReplaceEdit(shift+r.getOffset(), r.getLength(), rtext));
}
}
@Override
public int getExpansionStepCount() {
int result= 0;
for (int i=0; i < fDelegates.length; i++) {
result+= fDelegates[i].getExpansionStepCount();
}
return result;
}
@Override
public IMacroExpansionStep getExpansionStep(int step) throws IndexOutOfBoundsException {
if (step < 0) {
throw new IndexOutOfBoundsException();
}
if (fCachedStep != null && fCachedStepID == step) {
return fCachedStep;
}
int i;
MacroExpansionStep dresult= null;
StringBuilder before= new StringBuilder();
before.append(fSource, 0, fBoundaries[0]);
for (i=0; i < fDelegates.length; i++) {
final SingleMacroExpansionExplorer delegate = fDelegates[i];
int dsteps= delegate.getExpansionStepCount();
if (step < dsteps) {
dresult= delegate.getExpansionStep(step);
break;
}
before.append(delegate.getFullExpansion().getCodeAfterStep());
appendGap(before, i);
step-= dsteps;
}
if (dresult == null) {
throw new IndexOutOfBoundsException();
}
final int shift= before.length();
final int end= fBoundaries[2*i+1];
before.append(dresult.getCodeBeforeStep());
before.append(fSource, end, fSource.length-end);
List<ReplaceEdit> replacements= new ArrayList<ReplaceEdit>();
shiftAndAddEdits(shift, dresult.getReplacements(), replacements);
fCachedStep= new MacroExpansionStep(before.toString(), dresult.getExpandedMacro(), dresult.getLocationOfExpandedMacroDefinition(), replacements.toArray(new ReplaceEdit[replacements.size()]));
fCachedStepID= step;
return fCachedStep;
}
private void appendGap(StringBuilder result, int i) {
int idx= 2*i+1;
int gapFrom= fBoundaries[idx];
int gapTo= fBoundaries[++idx];
result.append(fSource, gapFrom, gapTo-gapFrom);
}
}
|
