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1
30 package org.objectweb.asm.util.attrs;
31
32 import java.util.List  ;
33 import java.util.Map ;
34
35 import org.objectweb.asm.Attribute;
36 import org.objectweb.asm.ClassReader;
37 import org.objectweb.asm.Label;
38 import org.objectweb.asm.attrs.StackMapTableAttribute;
39 import org.objectweb.asm.attrs.StackMapFrame;
40 import org.objectweb.asm.attrs.StackMapType;
41
42
47 public class ASMStackMapTableAttribute extends StackMapTableAttribute implements
48 ASMifiable,
49 Traceable
50 {
51
54 private int len;
55
56 public ASMStackMapTableAttribute() {
57 super();
58 }
59
60 public ASMStackMapTableAttribute(List frames, int len) {
61 super(frames);
62 this.len = len;
63 }
64
65 protected Attribute read(
66 ClassReader cr,
67 int off,
68 int len,
69 char[] buf,
70 int codeOff,
71 Label[] labels)
72 {
73 StackMapTableAttribute attr = (StackMapTableAttribute) super.read(cr,
74 off,
75 len,
76 buf,
77 codeOff,
78 labels);
79
80 return new ASMStackMapTableAttribute(attr.getFrames(), len);
81 }
82
83 public void asmify(StringBuffer buf, String varName, Map labelNames) {
84 List frames = getFrames();
85 if (frames.size() == 0) {
86 buf.append("List frames = Collections.EMPTY_LIST;\n");
87 } else {
88 buf.append("List frames = new ArrayList();\n");
89 for (int i = 0; i < frames.size(); i++) {
90 buf.append("{\n");
91 StackMapFrame f = (StackMapFrame) frames.get(i);
92 declareLabel(buf, labelNames, f.label);
93
94 String frameVar = varName + "frame" + i;
95 asmifyTypeInfo(buf, frameVar, labelNames, f.locals, "locals");
96 asmifyTypeInfo(buf, frameVar, labelNames, f.stack, "stack");
97
98 buf.append("StackMapFrame ")
99 .append(frameVar)
100 .append(" = new StackMapFrame(")
101 .append(labelNames.get(f.label))
102 .append(", locals, stack);\n");
103 buf.append("frames.add(").append(frameVar).append(");\n");
104 buf.append("}\n");
105 }
106 }
107 buf.append("StackMapTableAttribute ").append(varName);
108 buf.append(" = new StackMapTableAttribute(frames);\n");
109 }
110
111 void asmifyTypeInfo(
112 StringBuffer buf,
113 String varName,
114 Map labelNames,
115 List infos,
116 String field)
117 {
118 if (infos.size() == 0) {
119 buf.append("List ")
120 .append(field)
121 .append(" = Collections.EMPTY_LIST;\n");
122 } else {
123 buf.append("List ").append(field).append(" = new ArrayList();\n");
124 buf.append("{\n");
125 for (int i = 0; i < infos.size(); i++) {
126 StackMapType typeInfo = (StackMapType) infos.get(i);
127 String localName = varName + "Info" + i;
128 int type = typeInfo.getType();
129 buf.append("StackMapType ")
130 .append(localName)
131 .append(" = StackMapType.getTypeInfo( StackMapType.ITEM_")
132 .append(StackMapType.ITEM_NAMES[type])
133 .append(");\n");
134
135 switch (type) {
136 case StackMapType.ITEM_Object: buf.append(localName)
138 .append(".setObject(\"")
139 .append(typeInfo.getObject())
140 .append("\");\n");
141 break;
142
143 case StackMapType.ITEM_Uninitialized: declareLabel(buf, labelNames, typeInfo.getLabel());
145 buf.append(localName)
146 .append(".setLabel(")
147 .append(labelNames.get(typeInfo.getLabel()))
148 .append(");\n");
149 break;
150 }
151 buf.append(field)
152 .append(".add(")
153 .append(localName)
154 .append(");\n");
155 }
156 buf.append("}\n");
157 }
158 }
159
160 static void declareLabel(StringBuffer buf, Map labelNames, Label l) {
161 String name = (String ) labelNames.get(l);
162 if (name == null) {
163 name = "l" + labelNames.size();
164 labelNames.put(l, name);
165 buf.append("Label ").append(name).append(" = new Label();\n");
166 }
167 }
168
169 public void trace(StringBuffer buf, Map labelNames) {
170 List frames = getFrames();
171 buf.append("StackMapTable[\n");
172 for (int i = 0; i < frames.size(); i++) {
173 StackMapFrame f = (StackMapFrame) frames.get(i);
174
175 buf.append(" Frame:");
176 appendLabel(buf, labelNames, f.label);
177
178 buf.append(" locals[");
179 traceTypeInfo(buf, labelNames, f.locals);
180 buf.append("]");
181 buf.append(" stack[");
182 traceTypeInfo(buf, labelNames, f.stack);
183 buf.append("]\n");
184 }
185 buf.append(" ] length:").append(len).append("\n");
186 }
187
188 private void traceTypeInfo(StringBuffer buf, Map labelNames, List infos) {
189 String sep = "";
190 for (int i = 0; i < infos.size(); i++) {
191 StackMapType t = (StackMapType) infos.get(i);
192
193 buf.append(sep).append(StackMapType.ITEM_NAMES[t.getType()]);
194 sep = ", ";
195 if (t.getType() == StackMapType.ITEM_Object) {
196 buf.append(":").append(t.getObject());
197 }
198 if (t.getType() == StackMapType.ITEM_Uninitialized) {
199 buf.append(":");
200 appendLabel(buf, labelNames, t.getLabel());
201 }
202 }
203 }
204
205 protected void appendLabel(StringBuffer buf, Map labelNames, Label l) {
206 String name = (String ) labelNames.get(l);
207 if (name == null) {
208 name = "L" + labelNames.size();
209 labelNames.put(l, name);
210 }
211 buf.append(name);
212 }
213
214 }
215 |
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