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/*
* SonarQube Java
* Copyright (C) 2012 SonarSource
* [email protected]
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 3 of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02
*/
package org.sonar.java.resolve;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.base.Preconditions;
import com.google.common.base.Throwables;
import com.google.common.collect.ImmutableList;
import com.google.common.io.Closeables;
import org.apache.commons.lang.StringUtils;
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.MethodVisitor;
import org.objectweb.asm.Opcodes;
import org.objectweb.asm.TypePath;
import org.objectweb.asm.signature.SignatureReader;
import org.objectweb.asm.signature.SignatureVisitor;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.sonar.java.bytecode.ClassLoaderBuilder;
import javax.annotation.Nullable;
import java.io.Closeable;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
public class BytecodeCompleter implements Symbol.Completer {
private static final Logger LOG = LoggerFactory.getLogger(BytecodeCompleter.class);
private static final int ACCEPTABLE_BYTECODE_FLAGS = Flags.ACCESS_FLAGS |
Flags.INTERFACE | Flags.ANNOTATION | Flags.ENUM |
Flags.STATIC | Flags.FINAL | Flags.SYNCHRONIZED | Flags.VOLATILE | Flags.TRANSIENT | Flags.NATIVE |
Flags.ABSTRACT | Flags.STRICTFP | Flags.DEPRECATED;
private Symbols symbols;
private final List projectClasspath;
/**
* Indexed by flat name.
*/
private final Map classes = new HashMap();
private final Map packages = new HashMap();
private ClassLoader classLoader;
public BytecodeCompleter(List projectClasspath) {
this.projectClasspath = projectClasspath;
}
public void init(Symbols symbols) {
this.symbols = symbols;
}
public Symbol.TypeSymbol registerClass(Symbol.TypeSymbol classSymbol) {
String flatName = formFullName(classSymbol);
Preconditions.checkState(!classes.containsKey(flatName), "Registering class 2 times : " + flatName);
classes.put(flatName, classSymbol);
return classSymbol;
}
@Override
public void complete(Symbol symbol) {
LOG.debug("Completing symbol : " + symbol.name);
//complete outer class to set flags for inner class properly.
if (symbol.owner.isKind(Symbol.TYP)) {
symbol.owner.complete();
}
String bytecodeName = formFullName(symbol);
Symbol.TypeSymbol classSymbol = getClassSymbol(bytecodeName);
Preconditions.checkState(classSymbol == symbol);
InputStream inputStream = null;
ClassReader classReader = null;
try {
inputStream = inputStreamFor(bytecodeName);
classReader = new ClassReader(inputStream);
} catch (IOException e) {
throw Throwables.propagate(e);
} finally {
Closeables.closeQuietly(inputStream);
}
if (classReader != null) {
classReader.accept(new BytecodeVisitor((Symbol.TypeSymbol) symbol), ClassReader.SKIP_CODE | ClassReader.SKIP_FRAMES | ClassReader.SKIP_DEBUG);
}
}
private InputStream inputStreamFor(String fullname) {
return getClassLoader().getResourceAsStream(Convert.bytecodeName(fullname) + ".class");
}
private ClassLoader getClassLoader() {
if (classLoader == null) {
classLoader = ClassLoaderBuilder.create(projectClasspath);
}
return classLoader;
}
public String formFullName(Symbol symbol) {
return formFullName(symbol.name, symbol.owner);
}
public String formFullName(String name, Symbol site) {
String result = name;
Symbol owner = site;
while (owner != symbols.defaultPackage) {
//Handle inner classes, if owner is a type, separate by $
String separator = ".";
if (owner.kind == Symbol.TYP) {
separator = "$";
}
result = owner.name + separator + result;
owner = owner.owner();
}
return result;
}
@VisibleForTesting
Symbol.TypeSymbol getClassSymbol(String bytecodeName) {
return getClassSymbol(bytecodeName, 0);
}
// FIXME(Godin): or parameter must be renamed, or should not receive flat name, in a former case - first transformation in this method seems useless
private Symbol.TypeSymbol getClassSymbol(String bytecodeName, int flags) {
String flatName = Convert.flatName(bytecodeName);
Symbol.TypeSymbol symbol = classes.get(flatName);
if (symbol == null) {
String shortName = Convert.shortName(flatName);
String packageName = Convert.packagePart(flatName);
String enclosingClassName = Convert.enclosingClassName(shortName);
if (StringUtils.isNotEmpty(enclosingClassName)) {
//handle innerClasses
symbol = new Symbol.TypeSymbol(filterBytecodeFlags(flags), Convert.innerClassName(shortName), getClassSymbol(Convert.fullName(packageName, enclosingClassName)));
} else {
symbol = new Symbol.TypeSymbol(filterBytecodeFlags(flags), shortName, enterPackage(packageName));
}
symbol.members = new Scope(symbol);
// (Godin): IOException will happen without this condition in case of missing class:
if (getClassLoader().getResource(Convert.bytecodeName(flatName) + ".class") != null) {
symbol.completer = this;
} else {
LOG.error("Class not found: " + bytecodeName);
// TODO(Godin): why only interfaces, but not supertype for example?
((Type.ClassType) symbol.type).interfaces = ImmutableList.of();
}
classes.put(flatName, symbol);
}
return symbol;
}
private int filterBytecodeFlags(int flags) {
return flags & ACCEPTABLE_BYTECODE_FLAGS;
}
/**
* Note: Attempt to find something like "java.class" on case-insensitive file system can result in unwanted loading of "JAVA.class".
* This method performs check of class name within file in order to avoid such situation.
* This is definitely not the best solution in terms of performance, but acceptable for now.
*
* @return symbol for requested class, if corresponding class file exists, and {@link Resolve.SymbolNotFound} otherwise
*/
// TODO(Godin): Method name is misleading because of lazy loading.
public Symbol loadClass(String fullname) {
Symbol.TypeSymbol symbol = classes.get(fullname);
if (symbol != null) {
return symbol;
}
// TODO(Godin): pull out conversion of name from the next method to avoid unnecessary conversion afterwards:
InputStream inputStream = inputStreamFor(fullname);
String bytecodeName = Convert.bytecodeName(fullname);
if (inputStream == null) {
return new Resolve.SymbolNotFound();
}
try {
ClassReader classReader = new ClassReader(inputStream);
String className = classReader.getClassName();
if (!className.equals(bytecodeName)) {
return new Resolve.SymbolNotFound();
}
} catch (IOException e) {
throw Throwables.propagate(e);
} finally {
Closeables.closeQuietly(inputStream);
}
return getClassSymbol(fullname);
}
public Symbol.PackageSymbol enterPackage(String fullname) {
if (StringUtils.isBlank(fullname)) {
return symbols.defaultPackage;
}
Symbol.PackageSymbol result = packages.get(fullname);
if (result == null) {
result = new Symbol.PackageSymbol(fullname, symbols.defaultPackage);
packages.put(fullname, result);
}
return result;
}
public void done() {
if (classLoader != null && classLoader instanceof Closeable) {
Closeables.closeQuietly((Closeable) classLoader);
}
}
private class BytecodeVisitor extends ClassVisitor {
private final Symbol.TypeSymbol classSymbol;
/**
* Name of current class in a format as it appears in bytecode, i.e. "org/example/MyClass$InnerClass".
*/
private String className;
private BytecodeVisitor(Symbol.TypeSymbol classSymbol) {
super(Opcodes.ASM5);
this.classSymbol = classSymbol;
}
private Symbol.TypeSymbol getClassSymbol(String bytecodeName) {
return BytecodeCompleter.this.getClassSymbol(Convert.flatName(bytecodeName));
}
private Symbol.TypeSymbol getClassSymbol(String bytecodeName, int flags) {
return BytecodeCompleter.this.getClassSymbol(Convert.flatName(bytecodeName), flags);
}
@Override
public void visit(int version, int flags, String name, @Nullable String signature, @Nullable String superName, @Nullable String[] interfaces) {
Preconditions.checkState(name.endsWith(classSymbol.name), "Name : '" + name + "' should ends with " + classSymbol.name);
Preconditions.checkState(!isSynthetic(flags), name + " is synthetic");
className = name;
if(signature != null) {
new SignatureReader(signature).accept(new SignatureVisitor(Opcodes.ASM5) {
@Override
public void visitFormalTypeParameter(String name) {
//TODO improve generics
classSymbol.isParametrized = true;
}
});
}
//if class has already access flags set (inner class) then do not reset those.
//The important access flags are the one defined in the outer class.
if ((classSymbol.flags & Flags.ACCESS_FLAGS) != 0) {
classSymbol.flags |= filterBytecodeFlags(flags & ~Flags.ACCESS_FLAGS);
} else {
classSymbol.flags |= filterBytecodeFlags(flags);
}
classSymbol.members = new Scope(classSymbol);
if (superName == null) {
Preconditions.checkState("java/lang/Object".equals(className), "superName must be null only for java/lang/Object, but not for " + className);
// TODO(Godin): what about interfaces and annotations
} else {
((Type.ClassType) classSymbol.type).supertype = getClassSymbol(superName).type;
}
((Type.ClassType) classSymbol.type).interfaces = getCompletedClassSymbolsType(interfaces);
}
@Override
public void visitSource(@Nullable String source, @Nullable String debug) {
throw new IllegalStateException();
}
/**
* {@inheritDoc}
*
* In other words must be called only for anonymous classes or named classes declared within methods,
* which must not be processed by {@link BytecodeCompleter}, therefore this method always throws {@link java.lang.IllegalStateException}.
*
* @throws java.lang.IllegalStateException always
*/
@Override
public void visitOuterClass(String owner, String name, String desc) {
throw new IllegalStateException();
}
@Override
public AnnotationVisitor visitAnnotation(String desc, boolean visible) {
// (Godin): can return AnnotationVisitor to read annotations
return null;
}
@Override
public AnnotationVisitor visitTypeAnnotation(int typeRef, TypePath typePath, String desc, boolean visible) {
// (Godin): can return AnnotationVisitor to read annotations
return null;
}
@Override
public void visitAttribute(Attribute attr) {
// skip non standard attributes
}
@Override
public void visitInnerClass(String name, @Nullable String outerName, @Nullable String innerName, int flags) {
if (!isSynthetic(flags)) {
// TODO what about flags?
if (innerName == null) {
// anonymous class
} else if (outerName == null) {
// named class declared within method
} else if (className.equals(outerName)) {
defineInnerClass(name, flags);
} else if (className.equals(name)) {
defineOuterClass(outerName, innerName, flags);
} else {
// FIXME(Godin): for example if loading started from "C1.C2.C3" in case of
// class C1 { class C2 { class C3 { } } }
// then name="C1$C2", outerName="C1" and innerName="C3"
}
}
}
/**
* Invoked when current class classified as outer class of some inner class.
* Adds inner class as member.
*/
private void defineInnerClass(String bytecodeName, int flags) {
Symbol.TypeSymbol innerClass = getClassSymbol(bytecodeName, flags);
innerClass.flags |= filterBytecodeFlags(flags);
Preconditions.checkState(innerClass.owner == classSymbol, "Innerclass: " + innerClass.owner.getName() + " and classSymbol: " + classSymbol.getName() + " are not the same.");
classSymbol.members.enter(innerClass);
}
/**
* Invoked when current class classified as inner class.
* Owner of inner classes - is some outer class,
* which is either already completed, and thus already has this inner class as member,
* either will be completed by {@link BytecodeCompleter}, and thus will have this inner class as member (see {@link #defineInnerClass(String, int)}).
*/
private void defineOuterClass(String outerName, String innerName, int flags) {
Symbol.TypeSymbol outerClassSymbol = getClassSymbol(outerName, flags);
Preconditions.checkState(outerClassSymbol.completer == null || outerClassSymbol.completer instanceof BytecodeCompleter);
classSymbol.name = innerName;
classSymbol.owner = outerClassSymbol;
}
@Override
public FieldVisitor visitField(int flags, String name, String desc, @Nullable String signature, @Nullable Object value) {
Preconditions.checkNotNull(name);
Preconditions.checkNotNull(desc);
if (!isSynthetic(flags)) {
//Flags from asm lib are defined in Opcodes class and map to flags defined in Flags class
final Symbol.VariableSymbol symbol = new Symbol.VariableSymbol(filterBytecodeFlags(flags), name, convertAsmType(org.objectweb.asm.Type.getType(desc)), classSymbol);
classSymbol.members.enter(symbol);
if(signature != null) {
new SignatureReader(signature).accept(new SignatureVisitor(Opcodes.ASM5) {
@Override
public void visitFormalTypeParameter(String name) {
//TODO improve generics
symbol.isParametrized = true;
}
});
}
}
// (Godin): can return FieldVisitor to read annotations
return null;
}
@Override
public MethodVisitor visitMethod(int flags, String name, String desc, @Nullable String signature, @Nullable String[] exceptions) {
Preconditions.checkNotNull(name);
Preconditions.checkNotNull(desc);
if (!isSynthetic(flags)) {
Preconditions.checkState((flags & Opcodes.ACC_BRIDGE) == 0, "bridge method not marked as synthetic in class " + className);
// TODO(Godin): according to JVMS 4.7.24 - parameter can be marked as synthetic
Type.MethodType type = new Type.MethodType(
convertAsmTypes(org.objectweb.asm.Type.getArgumentTypes(desc)),
convertAsmType(org.objectweb.asm.Type.getReturnType(desc)),
getCompletedClassSymbolsType(exceptions),
classSymbol
);
final Symbol.MethodSymbol methodSymbol = new Symbol.MethodSymbol(filterBytecodeFlags(flags), name, type, classSymbol);
classSymbol.members.enter(methodSymbol);
if(signature != null) {
new SignatureReader(signature).accept(new SignatureVisitor(Opcodes.ASM5) {
@Override
public void visitFormalTypeParameter(String name) {
//TODO improve generics
methodSymbol.isParametrized = true;
}
});
}
}
// (Godin): can return MethodVisitor to read annotations
return null;
}
private List convertAsmTypes(org.objectweb.asm.Type[] asmTypes) {
ImmutableList.Builder result = ImmutableList.builder();
for (org.objectweb.asm.Type asmType : asmTypes) {
result.add(convertAsmType(asmType));
}
return result.build();
}
private Type convertAsmType(org.objectweb.asm.Type asmType) {
Type result;
switch (asmType.getSort()) {
case org.objectweb.asm.Type.OBJECT:
result = getClassSymbol(asmType.getInternalName()).type;
break;
case org.objectweb.asm.Type.BYTE:
result = symbols.byteType;
break;
case org.objectweb.asm.Type.CHAR:
result = symbols.charType;
break;
case org.objectweb.asm.Type.SHORT:
result = symbols.shortType;
break;
case org.objectweb.asm.Type.INT:
result = symbols.intType;
break;
case org.objectweb.asm.Type.LONG:
result = symbols.longType;
break;
case org.objectweb.asm.Type.FLOAT:
result = symbols.floatType;
break;
case org.objectweb.asm.Type.DOUBLE:
result = symbols.doubleType;
break;
case org.objectweb.asm.Type.BOOLEAN:
result = symbols.booleanType;
break;
case org.objectweb.asm.Type.ARRAY:
result = new Type.ArrayType(convertAsmType(asmType.getElementType()), symbols.arrayClass);
break;
case org.objectweb.asm.Type.VOID:
result = symbols.voidType;
break;
default:
throw new IllegalArgumentException(asmType.toString());
}
return result;
}
/**
* If at this point there is no owner of current class, then this is a top-level class,
* because outer classes always will be completed before inner classes - see {@link #defineOuterClass(String, String, int)}.
* Owner of top-level classes - is a package.
*/
@Override
public void visitEnd() {
if (classSymbol.owner == null) {
String flatName = className.replace('/', '.');
classSymbol.name = flatName.substring(flatName.lastIndexOf('.') + 1);
classSymbol.owner = enterPackage(flatName);
Symbol.PackageSymbol owner = (Symbol.PackageSymbol) classSymbol.owner;
if (owner.members == null) {
// package was without classes so far
owner.members = new Scope(owner);
}
owner.members.enter(classSymbol);
}
}
private List getCompletedClassSymbolsType(@Nullable String[] bytecodeNames) {
if (bytecodeNames == null) {
return ImmutableList.of();
}
ImmutableList.Builder types = ImmutableList.builder();
for (String bytecodeName : bytecodeNames) {
types.add(getClassSymbol(bytecodeName).type);
}
return types.build();
}
}
/**
* Compiler marks all artifacts not presented in the source code as {@link Flags#SYNTHETIC}.
*/
static boolean isSynthetic(int flags) {
return (flags & Flags.SYNTHETIC) != 0;
}
}
