Java example source code file (DPrinter.java)
The DPrinter.java Java example source code
/*
* Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code 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 General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.EnumSet;
import java.util.HashMap;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.Set;
import javax.lang.model.element.Name;
import javax.lang.model.element.TypeElement;
import javax.tools.FileObject;
import javax.tools.JavaCompiler;
import javax.tools.JavaFileObject;
import javax.tools.StandardJavaFileManager;
import javax.tools.StandardLocation;
import javax.tools.ToolProvider;
import com.sun.source.util.JavacTask;
import com.sun.source.util.TaskEvent;
import com.sun.source.util.TaskListener;
import com.sun.source.util.Trees;
import com.sun.tools.javac.api.JavacTrees;
import com.sun.tools.javac.code.SymbolMetadata;
import com.sun.tools.javac.code.Attribute;
import com.sun.tools.javac.code.Flags;
import com.sun.tools.javac.code.Kinds;
import com.sun.tools.javac.code.Printer;
import com.sun.tools.javac.code.Scope;
import com.sun.tools.javac.code.Scope.CompoundScope;
import com.sun.tools.javac.code.Symbol;
import com.sun.tools.javac.code.Symbol.*;
import com.sun.tools.javac.code.Type;
import com.sun.tools.javac.code.Type.*;
import com.sun.tools.javac.code.TypeTag;
import com.sun.tools.javac.tree.JCTree;
import com.sun.tools.javac.tree.JCTree.*;
import com.sun.tools.javac.tree.Pretty;
import com.sun.tools.javac.tree.TreeInfo;
import com.sun.tools.javac.tree.TreeScanner;
import com.sun.tools.javac.util.Assert;
import com.sun.tools.javac.util.Context;
import com.sun.tools.javac.util.Log;
/**
* Debug printer for javac internals, for when toString() just isn't enough.
*
* <p>
* The printer provides an API to generate structured views of javac objects,
* such as AST nodes, symbol, types and annotations. Various aspects of the
* output can be configured, such as whether to show nulls, empty lists, or
* a compressed representation of the source code. Visitors are used to walk
* object hierarchies, and can be replaced with custom visitors if the default
* visitors are not flexible enough.
*
* <p>
* In general, nodes are printed with an initial line identifying the node
* followed by indented lines for the child nodes. Currently, graphs are
* represented by printing a spanning subtree.
*
* <p>
* The printer can be accessed via a simple command-line utility,
* which makes it easy to see the internal representation of source code,
* such as simple test programs, during the compilation pipeline.
*
* <p>This is NOT part of any supported API.
* If you write code that depends on this, you do so at your own risk.
* This code and its internal interfaces are subject to change or
* deletion without notice.</b>
*/
public class DPrinter {
protected final PrintWriter out;
protected final Trees trees;
protected Printer printer;
protected boolean showEmptyItems = true;
protected boolean showNulls = true;
protected boolean showPositions = false;
protected boolean showSrc;
protected boolean showTreeSymbols;
protected boolean showTreeTypes;
protected int maxSrcLength = 32;
protected Locale locale = Locale.getDefault();
protected static final String NULL = "#null";
// <editor-fold defaultstate="collapsed" desc="Configuration">
public static DPrinter instance(Context context) {
DPrinter dp = context.get(DPrinter.class);
if (dp == null) {
dp = new DPrinter(context);
}
return dp;
}
protected DPrinter(Context context) {
context.put(DPrinter.class, this);
out = context.get(Log.outKey);
trees = JavacTrees.instance(context);
}
public DPrinter(PrintWriter out, Trees trees) {
this.out = out;
this.trees = trees;
}
public DPrinter emptyItems(boolean showEmptyItems) {
this.showEmptyItems = showEmptyItems;
return this;
}
public DPrinter nulls(boolean showNulls) {
this.showNulls = showNulls;
return this;
}
public DPrinter positions(boolean showPositions) {
this.showPositions = showPositions;
return this;
}
public DPrinter source(boolean showSrc) {
this.showSrc = showSrc;
return this;
}
public DPrinter source(int maxSrcLength) {
this.showSrc = true;
this.maxSrcLength = maxSrcLength;
return this;
}
public DPrinter treeSymbols(boolean showTreeSymbols) {
this.showTreeSymbols = showTreeSymbols;
return this;
}
public DPrinter treeTypes(boolean showTreeTypes) {
this.showTreeTypes = showTreeTypes;
return this;
}
public DPrinter typeSymbolPrinter(Printer p) {
printer = p;
return this;
}
// </editor-fold>
// <editor-fold defaultstate="collapsed" desc="Printing">
protected enum Details {
/** A one-line non-recursive summary */
SUMMARY,
/** Multi-line, possibly recursive. */
FULL
};
public void printAnnotations(String label, SymbolMetadata annotations) {
printAnnotations(label, annotations, Details.FULL);
}
protected void printAnnotations(String label, SymbolMetadata annotations, Details details) {
if (annotations == null) {
printNull(label);
} else {
// no SUMMARY format currently available to use
// use reflection to get at private fields
Object DECL_NOT_STARTED = getField(null, SymbolMetadata.class, "DECL_NOT_STARTED");
Object DECL_IN_PROGRESS = getField(null, SymbolMetadata.class, "DECL_IN_PROGRESS");
Object attributes = getField(annotations, SymbolMetadata.class, "attributes");
Object type_attributes = getField(annotations, SymbolMetadata.class, "type_attributes");
if (!showEmptyItems) {
if (attributes instanceof List && ((List) attributes).isEmpty()
&& attributes != DECL_NOT_STARTED
&& attributes != DECL_IN_PROGRESS
&& type_attributes instanceof List && ((List) type_attributes).isEmpty())
return;
}
printString(label, hashString(annotations));
indent(+1);
if (attributes == DECL_NOT_STARTED)
printString("attributes", "DECL_NOT_STARTED");
else if (attributes == DECL_IN_PROGRESS)
printString("attributes", "DECL_IN_PROGRESS");
else if (attributes instanceof List)
printList("attributes", (List) attributes);
else
printObject("attributes", attributes, Details.SUMMARY);
if (attributes instanceof List)
printList("type_attributes", (List) type_attributes);
else
printObject("type_attributes", type_attributes, Details.SUMMARY);
indent(-1);
}
}
public void printAttribute(String label, Attribute attr) {
if (attr == null) {
printNull(label);
} else {
printString(label, attr.getClass().getSimpleName());
indent(+1);
attr.accept(attrVisitor);
indent(-1);
}
}
public void printFileObject(String label, FileObject fo) {
if (fo == null) {
printNull(label);
} else {
printString(label, fo.getName());
}
}
protected <T> void printImplClass(T item, Class stdImplClass) {
if (item.getClass() != stdImplClass)
printString("impl", item.getClass().getName());
}
public void printInt(String label, int i) {
printString(label, String.valueOf(i));
}
public void printList(String label, List<?> list) {
if (list == null) {
printNull(label);
} else if (!list.isEmpty() || showEmptyItems) {
printString(label, "[" + list.size() + "]");
indent(+1);
int i = 0;
for (Object item: list) {
printObject(String.valueOf(i++), item, Details.FULL);
}
indent(-1);
}
}
public void printName(String label, Name name) {
if (name == null) {
printNull(label);
} else {
printString(label, name.toString());
}
}
public void printNull(String label) {
if (showNulls)
printString(label, NULL);
}
protected void printObject(String label, Object item, Details details) {
if (item == null) {
printNull(label);
} else if (item instanceof Attribute) {
printAttribute(label, (Attribute) item);
} else if (item instanceof Symbol) {
printSymbol(label, (Symbol) item, details);
} else if (item instanceof Type) {
printType(label, (Type) item, details);
} else if (item instanceof JCTree) {
printTree(label, (JCTree) item);
} else if (item instanceof List) {
printList(label, (List) item);
} else if (item instanceof Name) {
printName(label, (Name) item);
} else {
printString(label, String.valueOf(item));
}
}
public void printScope(String label, Scope scope) {
printScope(label, scope, Details.FULL);
}
public void printScope(String label, Scope scope, Details details) {
if (scope == null) {
printNull(label);
} else {
switch (details) {
case SUMMARY: {
indent();
out.print(label);
out.print(": [");
String sep = "";
for (Symbol sym: scope.getElements()) {
out.print(sep);
out.print(sym.name);
sep = ",";
}
out.println("]");
break;
}
case FULL: {
indent();
out.println(label);
indent(+1);
printImplClass(scope, Scope.class);
printSymbol("owner", scope.owner, Details.SUMMARY);
printScope("next", scope.next, Details.SUMMARY);
printObject("shared", getField(scope, Scope.class, "shared"), Details.SUMMARY);
if (scope instanceof CompoundScope) {
printObject("subScopes",
getField(scope, CompoundScope.class, "subScopes"),
Details.FULL);
} else {
for (Symbol sym : scope.getElements()) {
printSymbol(sym.name.toString(), sym, Details.SUMMARY);
}
}
indent(-1);
break;
}
}
}
}
public void printSource(String label, JCTree tree) {
printString(label, Pretty.toSimpleString(tree, maxSrcLength));
}
public void printString(String label, String text) {
indent();
out.print(label);
out.print(": ");
out.print(text);
out.println();
}
public void printSymbol(String label, Symbol symbol) {
printSymbol(label, symbol, Details.FULL);
}
protected void printSymbol(String label, Symbol sym, Details details) {
if (sym == null) {
printNull(label);
} else {
switch (details) {
case SUMMARY:
printString(label, toString(sym));
break;
case FULL:
indent();
out.print(label);
out.println(": " +
info(sym.getClass(),
String.format("0x%x--%s", sym.kind, Kinds.kindName(sym)),
sym.getKind())
+ " " + sym.name
+ " " + hashString(sym));
indent(+1);
if (showSrc) {
JCTree tree = (JCTree) trees.getTree(sym);
if (tree != null)
printSource("src", tree);
}
printString("flags", String.format("0x%x--%s",
sym.flags_field, Flags.toString(sym.flags_field)));
printObject("completer", sym.completer, Details.SUMMARY); // what if too long?
printSymbol("owner", sym.owner, Details.SUMMARY);
printType("type", sym.type, Details.SUMMARY);
printType("erasure", sym.erasure_field, Details.SUMMARY);
sym.accept(symVisitor, null);
printAnnotations("annotations", sym.getAnnotations(), Details.SUMMARY);
indent(-1);
}
}
}
protected String toString(Symbol sym) {
return (printer != null) ? printer.visit(sym, locale) : String.valueOf(sym);
}
protected void printTree(String label, JCTree tree) {
if (tree == null) {
printNull(label);
} else {
indent();
String ext;
try {
ext = tree.getKind().name();
} catch (Throwable t) {
ext = "n/a";
}
out.print(label + ": " + info(tree.getClass(), tree.getTag(), ext));
if (showPositions) {
// We can always get start position, but to get end position
// and/or line+offset, we would need a JCCompilationUnit
out.print(" pos:" + tree.pos);
}
if (showTreeTypes && tree.type != null)
out.print(" type:" + toString(tree.type));
Symbol sym;
if (showTreeSymbols && (sym = TreeInfo.symbolFor(tree)) != null)
out.print(" sym:" + toString(sym));
out.println();
indent(+1);
if (showSrc) {
indent();
out.println("src: " + Pretty.toSimpleString(tree, maxSrcLength));
}
tree.accept(treeVisitor);
indent(-1);
}
}
public void printType(String label, Type type) {
printType(label, type, Details.FULL);
}
protected void printType(String label, Type type, Details details) {
if (type == null)
printNull(label);
else {
switch (details) {
case SUMMARY:
printString(label, toString(type));
break;
case FULL:
indent();
out.print(label);
out.println(": " + info(type.getClass(), type.getTag(), type.getKind())
+ " " + hashString(type));
indent(+1);
printSymbol("tsym", type.tsym, Details.SUMMARY);
printObject("constValue", type.constValue(), Details.SUMMARY);
printObject("annotations", type.getAnnotationMirrors(), Details.SUMMARY);
type.accept(typeVisitor, null);
indent(-1);
}
}
}
protected String toString(Type type) {
return (printer != null) ? printer.visit(type, locale) : String.valueOf(type);
}
protected String hashString(Object obj) {
return String.format("#%x", obj.hashCode());
}
protected String info(Class<?> clazz, Object internal, Object external) {
return String.format("%s,%s,%s", clazz.getSimpleName(), internal, external);
}
private int indent = 0;
protected void indent() {
for (int i = 0; i < indent; i++) {
out.print(" ");
}
}
protected void indent(int n) {
indent += n;
}
protected Object getField(Object o, Class<?> clazz, String name) {
try {
Field f = clazz.getDeclaredField(name);
boolean prev = f.isAccessible();
f.setAccessible(true);
try {
return f.get(o);
} finally {
f.setAccessible(prev);
}
} catch (ReflectiveOperationException e) {
return e;
} catch (SecurityException e) {
return e;
}
}
// </editor-fold>
// <editor-fold defaultstate="collapsed" desc="JCTree visitor methods">
protected JCTree.Visitor treeVisitor = new TreeVisitor();
/**
* Default visitor class for JCTree (AST) objects.
*/
public class TreeVisitor extends JCTree.Visitor {
@Override
public void visitTopLevel(JCCompilationUnit tree) {
printList("packageAnnotations", tree.packageAnnotations);
printTree("pid", tree.pid);
printList("defs", tree.defs);
}
@Override
public void visitImport(JCImport tree) {
printTree("qualid", tree.qualid);
}
@Override
public void visitClassDef(JCClassDecl tree) {
printName("name", tree.name);
printTree("mods", tree.mods);
printList("typarams", tree.typarams);
printTree("extending", tree.extending);
printList("implementing", tree.implementing);
printList("defs", tree.defs);
}
@Override
public void visitMethodDef(JCMethodDecl tree) {
printName("name", tree.name);
printTree("mods", tree.mods);
printTree("restype", tree.restype);
printList("typarams", tree.typarams);
printTree("recvparam", tree.recvparam);
printList("params", tree.params);
printList("thrown", tree.thrown);
printTree("defaultValue", tree.defaultValue);
printTree("body", tree.body);
}
@Override
public void visitVarDef(JCVariableDecl tree) {
printName("name", tree.name);
printTree("mods", tree.mods);
printTree("vartype", tree.vartype);
printTree("init", tree.init);
}
@Override
public void visitSkip(JCSkip tree) {
}
@Override
public void visitBlock(JCBlock tree) {
printList("stats", tree.stats);
}
@Override
public void visitDoLoop(JCDoWhileLoop tree) {
printTree("body", tree.body);
printTree("cond", tree.cond);
}
@Override
public void visitWhileLoop(JCWhileLoop tree) {
printTree("cond", tree.cond);
printTree("body", tree.body);
}
@Override
public void visitForLoop(JCForLoop tree) {
printList("init", tree.init);
printTree("cond", tree.cond);
printList("step", tree.step);
printTree("body", tree.body);
}
@Override
public void visitForeachLoop(JCEnhancedForLoop tree) {
printTree("var", tree.var);
printTree("expr", tree.expr);
printTree("body", tree.body);
}
@Override
public void visitLabelled(JCLabeledStatement tree) {
printTree("body", tree.body);
}
@Override
public void visitSwitch(JCSwitch tree) {
printTree("selector", tree.selector);
printList("cases", tree.cases);
}
@Override
public void visitCase(JCCase tree) {
printTree("pat", tree.pat);
printList("stats", tree.stats);
}
@Override
public void visitSynchronized(JCSynchronized tree) {
printTree("lock", tree.lock);
printTree("body", tree.body);
}
@Override
public void visitTry(JCTry tree) {
printList("resources", tree.resources);
printTree("body", tree.body);
printList("catchers", tree.catchers);
printTree("finalizer", tree.finalizer);
}
@Override
public void visitCatch(JCCatch tree) {
printTree("param", tree.param);
printTree("body", tree.body);
}
@Override
public void visitConditional(JCConditional tree) {
printTree("cond", tree.cond);
printTree("truepart", tree.truepart);
printTree("falsepart", tree.falsepart);
}
@Override
public void visitIf(JCIf tree) {
printTree("cond", tree.cond);
printTree("thenpart", tree.thenpart);
printTree("elsepart", tree.elsepart);
}
@Override
public void visitExec(JCExpressionStatement tree) {
printTree("expr", tree.expr);
}
@Override
public void visitBreak(JCBreak tree) {
printName("label", tree.label);
}
@Override
public void visitContinue(JCContinue tree) {
printName("label", tree.label);
}
@Override
public void visitReturn(JCReturn tree) {
printTree("expr", tree.expr);
}
@Override
public void visitThrow(JCThrow tree) {
printTree("expr", tree.expr);
}
@Override
public void visitAssert(JCAssert tree) {
printTree("cond", tree.cond);
printTree("detail", tree.detail);
}
@Override
public void visitApply(JCMethodInvocation tree) {
printList("typeargs", tree.typeargs);
printTree("meth", tree.meth);
printList("args", tree.args);
}
@Override
public void visitNewClass(JCNewClass tree) {
printTree("encl", tree.encl);
printList("typeargs", tree.typeargs);
printTree("clazz", tree.clazz);
printList("args", tree.args);
printTree("def", tree.def);
}
@Override
public void visitNewArray(JCNewArray tree) {
printList("annotations", tree.annotations);
printTree("elemtype", tree.elemtype);
printList("dims", tree.dims);
printList("dimAnnotations", tree.dimAnnotations);
printList("elems", tree.elems);
}
@Override
public void visitLambda(JCLambda tree) {
printTree("body", tree.body);
printList("params", tree.params);
}
@Override
public void visitParens(JCParens tree) {
printTree("expr", tree.expr);
}
@Override
public void visitAssign(JCAssign tree) {
printTree("lhs", tree.lhs);
printTree("rhs", tree.rhs);
}
@Override
public void visitAssignop(JCAssignOp tree) {
printTree("lhs", tree.lhs);
printTree("rhs", tree.rhs);
}
@Override
public void visitUnary(JCUnary tree) {
printTree("arg", tree.arg);
}
@Override
public void visitBinary(JCBinary tree) {
printTree("lhs", tree.lhs);
printTree("rhs", tree.rhs);
}
@Override
public void visitTypeCast(JCTypeCast tree) {
printTree("clazz", tree.clazz);
printTree("expr", tree.expr);
}
@Override
public void visitTypeTest(JCInstanceOf tree) {
printTree("expr", tree.expr);
printTree("clazz", tree.clazz);
}
@Override
public void visitIndexed(JCArrayAccess tree) {
printTree("indexed", tree.indexed);
printTree("index", tree.index);
}
@Override
public void visitSelect(JCFieldAccess tree) {
printTree("selected", tree.selected);
}
@Override
public void visitReference(JCMemberReference tree) {
printTree("expr", tree.expr);
printList("typeargs", tree.typeargs);
}
@Override
public void visitIdent(JCIdent tree) {
printName("name", tree.name);
}
@Override
public void visitLiteral(JCLiteral tree) {
printString("value", Pretty.toSimpleString(tree, 32));
}
@Override
public void visitTypeIdent(JCPrimitiveTypeTree tree) {
printString("typetag", tree.typetag.name());
}
@Override
public void visitTypeArray(JCArrayTypeTree tree) {
printTree("elemtype", tree.elemtype);
}
@Override
public void visitTypeApply(JCTypeApply tree) {
printTree("clazz", tree.clazz);
printList("arguments", tree.arguments);
}
@Override
public void visitTypeUnion(JCTypeUnion tree) {
printList("alternatives", tree.alternatives);
}
@Override
public void visitTypeIntersection(JCTypeIntersection tree) {
printList("bounds", tree.bounds);
}
@Override
public void visitTypeParameter(JCTypeParameter tree) {
printName("name", tree.name);
printList("annotations", tree.annotations);
printList("bounds", tree.bounds);
}
@Override
public void visitWildcard(JCWildcard tree) {
printTree("kind", tree.kind);
printTree("inner", tree.inner);
}
@Override
public void visitTypeBoundKind(TypeBoundKind tree) {
printString("kind", tree.kind.name());
}
@Override
public void visitModifiers(JCModifiers tree) {
printList("annotations", tree.annotations);
printString("flags", String.valueOf(Flags.asFlagSet(tree.flags)));
}
@Override
public void visitAnnotation(JCAnnotation tree) {
printTree("annotationType", tree.annotationType);
printList("args", tree.args);
}
@Override
public void visitAnnotatedType(JCAnnotatedType tree) {
printList("annotations", tree.annotations);
printTree("underlyingType", tree.underlyingType);
}
@Override
public void visitErroneous(JCErroneous tree) {
printList("errs", tree.errs);
}
@Override
public void visitLetExpr(LetExpr tree) {
printList("defs", tree.defs);
printTree("expr", tree.expr);
}
@Override
public void visitTree(JCTree tree) {
Assert.error();
}
}
// </editor-fold>
// <editor-fold defaultstate="collapsed" desc="Symbol visitor">
protected Symbol.Visitor<Void,Void> symVisitor = new SymbolVisitor();
/**
* Default visitor class for Symbol objects.
* Note: each visitXYZ method ends by calling the corresponding
* visit method for its superclass.
*/
class SymbolVisitor implements Symbol.Visitor<Void,Void> {
@Override
public Void visitClassSymbol(ClassSymbol sym, Void ignore) {
printName("fullname", sym.fullname);
printName("flatname", sym.flatname);
printScope("members", sym.members_field);
printFileObject("sourcefile", sym.sourcefile);
printFileObject("classfile", sym.classfile);
// trans-local?
// pool?
return visitTypeSymbol(sym, null);
}
@Override
public Void visitMethodSymbol(MethodSymbol sym, Void ignore) {
// code
printList("params", sym.params);
printList("savedParameterNames", sym.savedParameterNames);
return visitSymbol(sym, null);
}
@Override
public Void visitPackageSymbol(PackageSymbol sym, Void ignore) {
printName("fullname", sym.fullname);
printScope("members", sym.members_field);
printSymbol("package-info", sym.package_info, Details.SUMMARY);
return visitTypeSymbol(sym, null);
}
@Override
public Void visitOperatorSymbol(OperatorSymbol sym, Void ignore) {
printInt("opcode", sym.opcode);
return visitMethodSymbol(sym, null);
}
@Override
public Void visitVarSymbol(VarSymbol sym, Void ignore) {
printInt("pos", sym.pos);
printInt("adm", sym.adr);
// data is a private field, and the standard accessors may
// mutate it as part of lazy evaluation. Therefore, use
// reflection to get the raw data.
printObject("data", getField(sym, VarSymbol.class, "data"), Details.SUMMARY);
return visitSymbol(sym, null);
}
@Override
public Void visitTypeSymbol(TypeSymbol sym, Void ignore) {
return visitSymbol(sym, null);
}
@Override
public Void visitSymbol(Symbol sym, Void ignore) {
return null;
}
}
// </editor-fold>
// <editor-fold defaultstate="collapsed" desc="Type visitor">
protected Type.Visitor<Void,Void> typeVisitor = new TypeVisitor();
/**
* Default visitor class for Type objects.
* Note: each visitXYZ method ends by calling the corresponding
* visit method for its superclass.
*/
public class TypeVisitor implements Type.Visitor<Void,Void> {
public Void visitAnnotatedType(AnnotatedType type, Void ignore) {
printList("typeAnnotations", type.getAnnotationMirrors());
printType("underlyingType", type.unannotatedType(), Details.FULL);
return visitType(type, null);
}
public Void visitArrayType(ArrayType type, Void ignore) {
printType("elemType", type.elemtype, Details.FULL);
return visitType(type, null);
}
public Void visitCapturedType(CapturedType type, Void ignore) {
printType("wildcard", type.wildcard, Details.FULL);
return visitTypeVar(type, null);
}
public Void visitClassType(ClassType type, Void ignore) {
printType("outer", type.getEnclosingType(), Details.SUMMARY);
printList("typarams", type.typarams_field);
printList("allparams", type.allparams_field);
printType("supertype", type.supertype_field, Details.SUMMARY);
printList("interfaces", type.interfaces_field);
printList("allinterfaces", type.all_interfaces_field);
return visitType(type, null);
}
public Void visitErrorType(ErrorType type, Void ignore) {
printType("originalType", type.getOriginalType(), Details.FULL);
return visitClassType(type, null);
}
public Void visitForAll(ForAll type, Void ignore) {
printList("tvars", type.tvars);
return visitDelegatedType(type);
}
public Void visitMethodType(MethodType type, Void ignore) {
printList("argtypes", type.argtypes);
printType("restype", type.restype, Details.FULL);
printList("thrown", type.thrown);
return visitType(type, null);
}
public Void visitPackageType(PackageType type, Void ignore) {
return visitType(type, null);
}
public Void visitTypeVar(TypeVar type, Void ignore) {
// For TypeVars (and not subtypes), the bound should always be
// null or bot. So, only print the bound for subtypes of TypeVar,
// or if the bound is (erroneously) not null or bot.
if (!type.hasTag(TypeTag.TYPEVAR)
|| !(type.bound == null || type.bound.hasTag(TypeTag.BOT))) {
printType("bound", type.bound, Details.FULL);
}
printType("lower", type.lower, Details.FULL);
return visitType(type, null);
}
public Void visitUndetVar(UndetVar type, Void ignore) {
for (UndetVar.InferenceBound ib: UndetVar.InferenceBound.values())
printList("bounds." + ib, type.getBounds(ib));
printInt("declaredCount", type.declaredCount);
printType("inst", type.inst, Details.SUMMARY);
return visitDelegatedType(type);
}
public Void visitWildcardType(WildcardType type, Void ignore) {
printType("type", type.type, Details.SUMMARY);
printString("kind", type.kind.name());
printType("bound", type.bound, Details.SUMMARY);
return visitType(type, null);
}
protected Void visitDelegatedType(DelegatedType type) {
printType("qtype", type.qtype, Details.FULL);
return visitType(type, null);
}
public Void visitType(Type type, Void ignore) {
return null;
}
}
// </editor-fold>
// <editor-fold defaultstate="collapsed" desc="Attribute (annotations) visitor">
protected Attribute.Visitor attrVisitor = new AttributeVisitor();
/**
* Default visitor class for Attribute (annotation) objects.
*/
public class AttributeVisitor implements Attribute.Visitor {
public void visitConstant(Attribute.Constant a) {
printObject("value", a.value, Details.SUMMARY);
visitAttribute(a);
}
public void visitClass(Attribute.Class a) {
printObject("classType", a.classType, Details.SUMMARY);
visitAttribute(a);
}
public void visitCompound(Attribute.Compound a) {
if (a instanceof Attribute.TypeCompound) {
Attribute.TypeCompound ta = (Attribute.TypeCompound) a;
// consider a custom printer?
printObject("position", ta.position, Details.SUMMARY);
}
printObject("synthesized", a.isSynthesized(), Details.SUMMARY);
printList("values", a.values);
visitAttribute(a);
}
public void visitArray(Attribute.Array a) {
printList("values", Arrays.asList(a.values));
visitAttribute(a);
}
public void visitEnum(Attribute.Enum a) {
printSymbol("value", a.value, Details.SUMMARY);
visitAttribute(a);
}
public void visitError(Attribute.Error a) {
visitAttribute(a);
}
public void visitAttribute(Attribute a) {
printType("type", a.type, Details.SUMMARY);
}
}
// </editor-fold>
// <editor-fold defaultstate="collapsed" desc="Utility front end">
/**
* Utility class to invoke DPrinter from the command line.
*/
static class Main {
public static void main(String... args) throws IOException {
Main m = new Main();
PrintWriter out = new PrintWriter(System.out);
try {
if (args.length == 0)
m.usage(out);
else
m.run(out, args);
} finally {
out.flush();
}
}
void usage(PrintWriter out) {
out.println("Usage:");
out.println(" java " + Main.class.getName() + " mode [options] [javac-options]");
out.print("where mode is one of: ");
String sep = "";
for (Handler h: getHandlers().values()) {
out.print(sep);
out.print(h.name);
sep = ", ";
}
out.println();
out.println("and where options include:");
out.println(" -before PARSE|ENTER|ANALYZE|GENERATE|ANNOTATION_PROCESSING|ANNOTATION_PROCESSING_ROUND");
out.println(" -after PARSE|ENTER|ANALYZE|GENERATE|ANNOTATION_PROCESSING|ANNOTATION_PROCESSING_ROUND");
out.println(" -showPositions");
out.println(" -showSource");
out.println(" -showTreeSymbols");
out.println(" -showTreeTypes");
out.println(" -hideEmptyItems");
out.println(" -hideNulls");
}
void run(PrintWriter out, String... args) throws IOException {
JavaCompiler c = ToolProvider.getSystemJavaCompiler();
StandardJavaFileManager fm = c.getStandardFileManager(null, null, null);
// DPrinter options
final Set<TaskEvent.Kind> before = EnumSet.noneOf(TaskEvent.Kind.class);
final Set<TaskEvent.Kind> after = EnumSet.noneOf(TaskEvent.Kind.class);
boolean showPositions = false;
boolean showSource = false;
boolean showTreeSymbols = false;
boolean showTreeTypes = false;
boolean showEmptyItems = true;
boolean showNulls = true;
// javac options
Collection<String> options = new ArrayList
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