/* * 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. * *
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.
*/
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