| /* |
| * Copyright (c) 2009, 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. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * 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. |
| */ |
| |
| package com.sun.tools.javap; |
| |
| import java.util.Arrays; |
| import java.util.HashMap; |
| import java.util.Map; |
| |
| import com.sun.tools.classfile.AccessFlags; |
| import com.sun.tools.classfile.Attribute; |
| import com.sun.tools.classfile.Code_attribute; |
| import com.sun.tools.classfile.ConstantPool; |
| import com.sun.tools.classfile.ConstantPoolException; |
| import com.sun.tools.classfile.Descriptor; |
| import com.sun.tools.classfile.Descriptor.InvalidDescriptor; |
| import com.sun.tools.classfile.Instruction; |
| import com.sun.tools.classfile.Method; |
| import com.sun.tools.classfile.StackMapTable_attribute; |
| import com.sun.tools.classfile.StackMapTable_attribute.*; |
| |
| import static com.sun.tools.classfile.StackMapTable_attribute.verification_type_info.*; |
| |
| /** |
| * Annotate instructions with stack map. |
| * |
| * <p><b>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 StackMapWriter extends InstructionDetailWriter { |
| static StackMapWriter instance(Context context) { |
| StackMapWriter instance = context.get(StackMapWriter.class); |
| if (instance == null) |
| instance = new StackMapWriter(context); |
| return instance; |
| } |
| |
| protected StackMapWriter(Context context) { |
| super(context); |
| context.put(StackMapWriter.class, this); |
| classWriter = ClassWriter.instance(context); |
| } |
| |
| public void reset(Code_attribute attr) { |
| setStackMap((StackMapTable_attribute) attr.attributes.get(Attribute.StackMapTable)); |
| } |
| |
| void setStackMap(StackMapTable_attribute attr) { |
| if (attr == null) { |
| map = null; |
| return; |
| } |
| |
| Method m = classWriter.getMethod(); |
| Descriptor d = m.descriptor; |
| String[] args; |
| try { |
| ConstantPool cp = classWriter.getClassFile().constant_pool; |
| String argString = d.getParameterTypes(cp); |
| args = argString.substring(1, argString.length() - 1).split("[, ]+"); |
| } catch (ConstantPoolException | InvalidDescriptor e) { |
| return; |
| } |
| boolean isStatic = m.access_flags.is(AccessFlags.ACC_STATIC); |
| |
| verification_type_info[] initialLocals = new verification_type_info[(isStatic ? 0 : 1) + args.length]; |
| if (!isStatic) |
| initialLocals[0] = new CustomVerificationTypeInfo("this"); |
| for (int i = 0; i < args.length; i++) { |
| initialLocals[(isStatic ? 0 : 1) + i] = |
| new CustomVerificationTypeInfo(args[i].replace(".", "/")); |
| } |
| |
| map = new HashMap<>(); |
| StackMapBuilder builder = new StackMapBuilder(); |
| |
| // using -1 as the pc for the initial frame effectively compensates for |
| // the difference in behavior for the first stack map frame (where the |
| // pc offset is just offset_delta) compared to subsequent frames (where |
| // the pc offset is always offset_delta+1). |
| int pc = -1; |
| |
| map.put(pc, new StackMap(initialLocals, empty)); |
| |
| for (int i = 0; i < attr.entries.length; i++) |
| pc = attr.entries[i].accept(builder, pc); |
| } |
| |
| public void writeInitialDetails() { |
| writeDetails(-1); |
| } |
| |
| public void writeDetails(Instruction instr) { |
| writeDetails(instr.getPC()); |
| } |
| |
| private void writeDetails(int pc) { |
| if (map == null) |
| return; |
| |
| StackMap m = map.get(pc); |
| if (m != null) { |
| print("StackMap locals: ", m.locals); |
| print("StackMap stack: ", m.stack); |
| } |
| |
| } |
| |
| void print(String label, verification_type_info[] entries) { |
| print(label); |
| for (int i = 0; i < entries.length; i++) { |
| print(" "); |
| print(entries[i]); |
| } |
| println(); |
| } |
| |
| void print(verification_type_info entry) { |
| if (entry == null) { |
| print("ERROR"); |
| return; |
| } |
| |
| switch (entry.tag) { |
| case -1: |
| print(((CustomVerificationTypeInfo) entry).text); |
| break; |
| |
| case ITEM_Top: |
| print("top"); |
| break; |
| |
| case ITEM_Integer: |
| print("int"); |
| break; |
| |
| case ITEM_Float: |
| print("float"); |
| break; |
| |
| case ITEM_Long: |
| print("long"); |
| break; |
| |
| case ITEM_Double: |
| print("double"); |
| break; |
| |
| case ITEM_Null: |
| print("null"); |
| break; |
| |
| case ITEM_UninitializedThis: |
| print("uninit_this"); |
| break; |
| |
| case ITEM_Object: |
| try { |
| ConstantPool cp = classWriter.getClassFile().constant_pool; |
| ConstantPool.CONSTANT_Class_info class_info = cp.getClassInfo(((Object_variable_info) entry).cpool_index); |
| print(cp.getUTF8Value(class_info.name_index)); |
| } catch (ConstantPoolException e) { |
| print("??"); |
| } |
| break; |
| |
| case ITEM_Uninitialized: |
| print(((Uninitialized_variable_info) entry).offset); |
| break; |
| } |
| |
| } |
| |
| private Map<Integer, StackMap> map; |
| private ClassWriter classWriter; |
| |
| class StackMapBuilder |
| implements StackMapTable_attribute.stack_map_frame.Visitor<Integer, Integer> { |
| |
| public Integer visit_same_frame(same_frame frame, Integer pc) { |
| int new_pc = pc + frame.getOffsetDelta() + 1; |
| StackMap m = map.get(pc); |
| assert (m != null); |
| map.put(new_pc, m); |
| return new_pc; |
| } |
| |
| public Integer visit_same_locals_1_stack_item_frame(same_locals_1_stack_item_frame frame, Integer pc) { |
| int new_pc = pc + frame.getOffsetDelta() + 1; |
| StackMap prev = map.get(pc); |
| assert (prev != null); |
| StackMap m = new StackMap(prev.locals, frame.stack); |
| map.put(new_pc, m); |
| return new_pc; |
| } |
| |
| public Integer visit_same_locals_1_stack_item_frame_extended(same_locals_1_stack_item_frame_extended frame, Integer pc) { |
| int new_pc = pc + frame.getOffsetDelta() + 1; |
| StackMap prev = map.get(pc); |
| assert (prev != null); |
| StackMap m = new StackMap(prev.locals, frame.stack); |
| map.put(new_pc, m); |
| return new_pc; |
| } |
| |
| public Integer visit_chop_frame(chop_frame frame, Integer pc) { |
| int new_pc = pc + frame.getOffsetDelta() + 1; |
| StackMap prev = map.get(pc); |
| assert (prev != null); |
| int k = 251 - frame.frame_type; |
| verification_type_info[] new_locals = Arrays.copyOf(prev.locals, prev.locals.length - k); |
| StackMap m = new StackMap(new_locals, empty); |
| map.put(new_pc, m); |
| return new_pc; |
| } |
| |
| public Integer visit_same_frame_extended(same_frame_extended frame, Integer pc) { |
| int new_pc = pc + frame.getOffsetDelta(); |
| StackMap m = map.get(pc); |
| assert (m != null); |
| map.put(new_pc, m); |
| return new_pc; |
| } |
| |
| public Integer visit_append_frame(append_frame frame, Integer pc) { |
| int new_pc = pc + frame.getOffsetDelta() + 1; |
| StackMap prev = map.get(pc); |
| assert (prev != null); |
| verification_type_info[] new_locals = new verification_type_info[prev.locals.length + frame.locals.length]; |
| System.arraycopy(prev.locals, 0, new_locals, 0, prev.locals.length); |
| System.arraycopy(frame.locals, 0, new_locals, prev.locals.length, frame.locals.length); |
| StackMap m = new StackMap(new_locals, empty); |
| map.put(new_pc, m); |
| return new_pc; |
| } |
| |
| public Integer visit_full_frame(full_frame frame, Integer pc) { |
| int new_pc = pc + frame.getOffsetDelta() + 1; |
| StackMap m = new StackMap(frame.locals, frame.stack); |
| map.put(new_pc, m); |
| return new_pc; |
| } |
| |
| } |
| |
| static class StackMap { |
| StackMap(verification_type_info[] locals, verification_type_info[] stack) { |
| this.locals = locals; |
| this.stack = stack; |
| } |
| |
| private final verification_type_info[] locals; |
| private final verification_type_info[] stack; |
| } |
| |
| static class CustomVerificationTypeInfo extends verification_type_info { |
| public CustomVerificationTypeInfo(String text) { |
| super(-1); |
| this.text = text; |
| } |
| private String text; |
| } |
| |
| private final verification_type_info[] empty = { }; |
| } |