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292 lines
10 KiB
Java
292 lines
10 KiB
Java
/*
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* Copyright (c) 2009, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package com.sun.tools.javap;
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import com.sun.tools.classfile.AccessFlags;
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import java.util.HashMap;
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import java.util.Map;
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import com.sun.tools.classfile.Attribute;
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import com.sun.tools.classfile.Code_attribute;
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import com.sun.tools.classfile.ConstantPool;
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import com.sun.tools.classfile.ConstantPoolException;
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import com.sun.tools.classfile.Descriptor;
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import com.sun.tools.classfile.Descriptor.InvalidDescriptor;
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import com.sun.tools.classfile.Instruction;
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import com.sun.tools.classfile.Method;
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import com.sun.tools.classfile.StackMapTable_attribute;
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import com.sun.tools.classfile.StackMapTable_attribute.*;
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import static com.sun.tools.classfile.StackMapTable_attribute.verification_type_info.*;
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/**
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* Annotate instructions with stack map.
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*
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* <p><b>This is NOT part of any API supported by Sun Microsystems. If
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* you write code that depends on this, you do so at your own risk.
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* This code and its internal interfaces are subject to change or
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* deletion without notice.</b>
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*/
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public class StackMapWriter extends InstructionDetailWriter {
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static StackMapWriter instance(Context context) {
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StackMapWriter instance = context.get(StackMapWriter.class);
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if (instance == null)
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instance = new StackMapWriter(context);
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return instance;
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}
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protected StackMapWriter(Context context) {
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super(context);
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context.put(StackMapWriter.class, this);
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classWriter = ClassWriter.instance(context);
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}
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public void reset(Code_attribute attr) {
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setStackMap((StackMapTable_attribute) attr.attributes.get(Attribute.StackMapTable));
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}
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void setStackMap(StackMapTable_attribute attr) {
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if (attr == null) {
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map = null;
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return;
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}
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Method m = classWriter.getMethod();
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Descriptor d = m.descriptor;
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String[] args;
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try {
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ConstantPool cp = classWriter.getClassFile().constant_pool;
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String argString = d.getParameterTypes(cp);
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args = argString.substring(1, argString.length() - 1).split("[, ]+");
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} catch (ConstantPoolException e) {
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return;
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} catch (InvalidDescriptor e) {
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return;
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}
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boolean isStatic = m.access_flags.is(AccessFlags.ACC_STATIC);
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verification_type_info[] initialLocals = new verification_type_info[(isStatic ? 0 : 1) + args.length];
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if (!isStatic)
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initialLocals[0] = new CustomVerificationTypeInfo("this");
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for (int i = 0; i < args.length; i++) {
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initialLocals[(isStatic ? 0 : 1) + i] =
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new CustomVerificationTypeInfo(args[i].replace(".", "/"));
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}
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map = new HashMap<Integer, StackMap>();
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StackMapBuilder builder = new StackMapBuilder();
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// using -1 as the pc for the initial frame effectively compensates for
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// the difference in behavior for the first stack map frame (where the
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// pc offset is just offset_delta) compared to subsequent frames (where
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// the pc offset is always offset_delta+1).
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int pc = -1;
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map.put(pc, new StackMap(initialLocals, empty));
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for (int i = 0; i < attr.entries.length; i++)
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pc = attr.entries[i].accept(builder, pc);
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}
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public void writeInitialDetails() {
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writeDetails(-1);
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}
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public void writeDetails(Instruction instr) {
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writeDetails(instr.getPC());
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}
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private void writeDetails(int pc) {
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if (map == null)
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return;
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StackMap m = map.get(pc);
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if (m != null) {
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print("StackMap locals: ", m.locals);
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print("StackMap stack: ", m.stack);
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}
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}
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void print(String label, verification_type_info[] entries) {
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print(label);
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for (int i = 0; i < entries.length; i++) {
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print(" ");
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print(entries[i]);
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}
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println();
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}
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void print(verification_type_info entry) {
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if (entry == null) {
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print("ERROR");
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return;
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}
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switch (entry.tag) {
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case -1:
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print(((CustomVerificationTypeInfo) entry).text);
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break;
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case ITEM_Top:
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print("top");
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break;
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case ITEM_Integer:
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print("int");
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break;
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case ITEM_Float:
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print("float");
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break;
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case ITEM_Long:
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print("long");
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break;
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case ITEM_Double:
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print("double");
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break;
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case ITEM_Null:
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print("null");
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break;
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case ITEM_UninitializedThis:
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print("uninit_this");
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break;
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case ITEM_Object:
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try {
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ConstantPool cp = classWriter.getClassFile().constant_pool;
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ConstantPool.CONSTANT_Class_info class_info = cp.getClassInfo(((Object_variable_info) entry).cpool_index);
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print(cp.getUTF8Value(class_info.name_index));
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} catch (ConstantPoolException e) {
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print("??");
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}
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break;
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case ITEM_Uninitialized:
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print(((Uninitialized_variable_info) entry).offset);
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break;
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}
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}
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private Map<Integer, StackMap> map;
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private ClassWriter classWriter;
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class StackMapBuilder
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implements StackMapTable_attribute.stack_map_frame.Visitor<Integer, Integer> {
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public Integer visit_same_frame(same_frame frame, Integer pc) {
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int new_pc = pc + frame.getOffsetDelta() + 1;
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StackMap m = map.get(pc);
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assert (m != null);
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map.put(new_pc, m);
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return new_pc;
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}
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public Integer visit_same_locals_1_stack_item_frame(same_locals_1_stack_item_frame frame, Integer pc) {
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int new_pc = pc + frame.getOffsetDelta() + 1;
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StackMap prev = map.get(pc);
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assert (prev != null);
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StackMap m = new StackMap(prev.locals, frame.stack);
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map.put(new_pc, m);
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return new_pc;
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}
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public Integer visit_same_locals_1_stack_item_frame_extended(same_locals_1_stack_item_frame_extended frame, Integer pc) {
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int new_pc = pc + frame.getOffsetDelta() + 1;
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StackMap prev = map.get(pc);
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assert (prev != null);
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StackMap m = new StackMap(prev.locals, frame.stack);
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map.put(new_pc, m);
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return new_pc;
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}
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public Integer visit_chop_frame(chop_frame frame, Integer pc) {
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int new_pc = pc + frame.getOffsetDelta() + 1;
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StackMap prev = map.get(pc);
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assert (prev != null);
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int k = 251 - frame.frame_type;
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verification_type_info[] new_locals = new verification_type_info[prev.locals.length - k];
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System.arraycopy(prev.locals, 0, new_locals, 0, new_locals.length);
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StackMap m = new StackMap(new_locals, empty);
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map.put(new_pc, m);
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return new_pc;
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}
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public Integer visit_same_frame_extended(same_frame_extended frame, Integer pc) {
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int new_pc = pc + frame.getOffsetDelta();
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StackMap m = map.get(pc);
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assert (m != null);
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map.put(new_pc, m);
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return new_pc;
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}
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public Integer visit_append_frame(append_frame frame, Integer pc) {
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int new_pc = pc + frame.getOffsetDelta() + 1;
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StackMap prev = map.get(pc);
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assert (prev != null);
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verification_type_info[] new_locals = new verification_type_info[prev.locals.length + frame.locals.length];
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System.arraycopy(prev.locals, 0, new_locals, 0, prev.locals.length);
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System.arraycopy(frame.locals, 0, new_locals, prev.locals.length, frame.locals.length);
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StackMap m = new StackMap(new_locals, empty);
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map.put(new_pc, m);
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return new_pc;
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}
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public Integer visit_full_frame(full_frame frame, Integer pc) {
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int new_pc = pc + frame.getOffsetDelta() + 1;
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StackMap m = new StackMap(frame.locals, frame.stack);
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map.put(new_pc, m);
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return new_pc;
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}
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}
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class StackMap {
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StackMap(verification_type_info[] locals, verification_type_info[] stack) {
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this.locals = locals;
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this.stack = stack;
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}
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private final verification_type_info[] locals;
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private final verification_type_info[] stack;
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}
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class CustomVerificationTypeInfo extends verification_type_info {
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public CustomVerificationTypeInfo(String text) {
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super(-1);
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this.text = text;
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}
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private String text;
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}
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private final verification_type_info[] empty = { };
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}
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