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/**
* Copyright (C) 2006 Google Inc.
*
* 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.google.inject.internal.util;
import static com.google.inject.internal.util.Preconditions.checkNotNull;
import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.Member;
import java.lang.reflect.Method;
import java.util.Map;
import org.objectweb.asm.AnnotationVisitor;
import org.objectweb.asm.Attribute;
import org.objectweb.asm.ClassReader;
import org.objectweb.asm.ClassVisitor;
import org.objectweb.asm.FieldVisitor;
import org.objectweb.asm.Label;
import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.Opcodes;
/**
* Looks up line numbers for classes and their members.
*
* @author Chris Nokleberg
*/
final class LineNumbers {
private final Class type;
private final Map lines = Maps.newHashMap();
private String source;
private int firstLine = Integer.MAX_VALUE;
/**
* Reads line number information from the given class, if available.
*
* @param type the class to read line number information from
* @throws IllegalArgumentException if the bytecode for the class cannot be found
* @throws java.io.IOException if an error occurs while reading bytecode
*/
public LineNumbers(Class type) throws IOException {
this.type = type;
if (!type.isArray()) {
InputStream in = type.getResourceAsStream("/" + type.getName().replace('.', '/') + ".class");
Preconditions.checkArgument(in != null, "Cannot find bytecode for %s", type);
new ClassReader(in).accept(new LineNumberReader(), ClassReader.SKIP_FRAMES);
}
}
/**
* Get the source file name as read from the bytecode.
*
* @return the source file name if available, or null
*/
public String getSource() {
return source;
}
/**
* Get the line number associated with the given member.
*
* @param member a field, constructor, or method belonging to the class used during construction
* @return the wrapped line number, or null if not available
* @throws IllegalArgumentException if the member does not belong to the class used during
* construction
*/
public Integer getLineNumber(Member member) {
Preconditions.checkArgument(type == member.getDeclaringClass(),
"Member %s belongs to %s, not %s", member, member.getDeclaringClass(), type);
return lines.get(memberKey(member));
}
/** Gets the first line number. */
public int getFirstLine() {
return firstLine == Integer.MAX_VALUE ? 1 : firstLine;
}
private String memberKey(Member member) {
checkNotNull(member, "member");
/*if[AOP]*/
if (member instanceof Field) {
return member.getName();
} else if (member instanceof Method) {
return member.getName() + org.objectweb.asm.Type.getMethodDescriptor((Method) member);
} else if (member instanceof Constructor) {
StringBuilder sb = new StringBuilder().append("(");
for (Class param : ((Constructor) member).getParameterTypes()) {
sb.append(org.objectweb.asm.Type.getDescriptor(param));
}
return sb.append(")V").toString();
} else {
throw new IllegalArgumentException(
"Unsupported implementation class for Member, " + member.getClass());
}
/*end[AOP]*/
/*if[NO_AOP]
return "";
end[NO_AOP]*/
}
private class LineNumberReader implements ClassVisitor, MethodVisitor, AnnotationVisitor {
private int line = -1;
private String pendingMethod;
private String name;
public void visit(int version, int access, String name, String signature,
String superName, String[] interfaces) {
this.name = name;
}
public MethodVisitor visitMethod(int access, String name, String desc,
String signature, String[] exceptions) {
if ((access & Opcodes.ACC_PRIVATE) != 0) {
return null;
}
pendingMethod = name + desc;
line = -1;
return this;
}
public void visitSource(String source, String debug) {
LineNumbers.this.source = source;
}
public void visitLineNumber(int line, Label start) {
if (line < firstLine) {
firstLine = line;
}
this.line = line;
if (pendingMethod != null) {
lines.put(pendingMethod, line);
pendingMethod = null;
}
}
public void visitFieldInsn(int opcode, String owner, String name,
String desc) {
if (opcode == Opcodes.PUTFIELD && this.name.equals(owner)
&& !lines.containsKey(name) && line != -1) {
lines.put(name, line);
}
}
public void visitEnd() {
}
public void visitInnerClass(String name, String outerName, String innerName,
int access) {
}
public void visitOuterClass(String owner, String name, String desc) {
}
public void visitAttribute(Attribute attr) {
}
public FieldVisitor visitField(int access, String name, String desc,
String signature, Object value) {
return null;
}
public AnnotationVisitor visitAnnotation(String desc, boolean visible) {
return this;
}
public AnnotationVisitor visitAnnotation(String name, String desc) {
return this;
}
public AnnotationVisitor visitAnnotationDefault() {
return this;
}
public AnnotationVisitor visitParameterAnnotation(int parameter,
String desc, boolean visible) {
return this;
}
public AnnotationVisitor visitArray(String name) {
return this;
}
public void visitEnum(String name, String desc, String value) {
}
public void visit(String name, Object value) {
}
public void visitCode() {
}
public void visitFrame(int type, int nLocal, Object[] local, int nStack,
Object[] stack) {
}
public void visitIincInsn(int var, int increment) {
}
public void visitInsn(int opcode) {
}
public void visitIntInsn(int opcode, int operand) {
}
public void visitJumpInsn(int opcode, Label label) {
}
public void visitLabel(Label label) {
}
public void visitLdcInsn(Object cst) {
}
public void visitLocalVariable(String name, String desc, String signature,
Label start, Label end, int index) {
}
public void visitLookupSwitchInsn(Label dflt, int[] keys, Label[] labels) {
}
public void visitMaxs(int maxStack, int maxLocals) {
}
public void visitMethodInsn(int opcode, String owner, String name,
String desc) {
}
public void visitMultiANewArrayInsn(String desc, int dims) {
}
public void visitTableSwitchInsn(int min, int max, Label dflt,
Label[] labels) {
}
public void visitTryCatchBlock(Label start, Label end, Label handler,
String type) {
}
public void visitTypeInsn(int opcode, String desc) {
}
public void visitVarInsn(int opcode, int var) {
}
}
}
