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- /*
- * Javassist, a Java-bytecode translator toolkit.
- * Copyright (C) 1999- Shigeru Chiba. All Rights Reserved.
- *
- * The contents of this file are subject to the Mozilla Public License Version
- * 1.1 (the "License"); you may not use this file except in compliance with
- * the License. Alternatively, the contents of this file may be used under
- * the terms of the GNU Lesser General Public License Version 2.1 or later,
- * or the Apache License Version 2.0.
- *
- * Software distributed under the License is distributed on an "AS IS" basis,
- * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
- * for the specific language governing rights and limitations under the
- * License.
- */
-
- package javassist.bytecode.stackmap;
-
- import javassist.bytecode.*;
-
- public class TypedBlock extends BasicBlock {
- public int stackTop, numLocals;
- // localsTypes is set to non-null when this block is first visited by a MapMaker.
- // see alreadySet().
- public TypeData[] localsTypes;
- public TypeData[] stackTypes;
-
- /**
- * Divides the method body into basic blocks.
- * The type information of the first block is initialized.
- *
- * @param optmize if it is true and the method does not include
- * branches, this method returns null.
- */
- public static TypedBlock[] makeBlocks(MethodInfo minfo, CodeAttribute ca,
- boolean optimize)
- throws BadBytecode
- {
- TypedBlock[] blocks = (TypedBlock[])new Maker().make(minfo);
- if (optimize && blocks.length < 2)
- if (blocks.length == 0 || blocks[0].incoming == 0)
- return null;
-
- ConstPool pool = minfo.getConstPool();
- boolean isStatic = (minfo.getAccessFlags() & AccessFlag.STATIC) != 0;
- blocks[0].initFirstBlock(ca.getMaxStack(), ca.getMaxLocals(),
- pool.getClassName(), minfo.getDescriptor(),
- isStatic, minfo.isConstructor());
- return blocks;
- }
-
- protected TypedBlock(int pos) {
- super(pos);
- localsTypes = null;
- }
-
- protected void toString2(StringBuffer sbuf) {
- super.toString2(sbuf);
- sbuf.append(",\n stack={");
- printTypes(sbuf, stackTop, stackTypes);
- sbuf.append("}, locals={");
- printTypes(sbuf, numLocals, localsTypes);
- sbuf.append('}');
- }
-
- private void printTypes(StringBuffer sbuf, int size,
- TypeData[] types) {
- if (types == null)
- return;
-
- for (int i = 0; i < size; i++) {
- if (i > 0)
- sbuf.append(", ");
-
- TypeData td = types[i];
- sbuf.append(td == null ? "<>" : td.toString());
- }
- }
-
- public boolean alreadySet() {
- return localsTypes != null;
- }
-
- public void setStackMap(int st, TypeData[] stack, int nl, TypeData[] locals)
- throws BadBytecode
- {
- stackTop = st;
- stackTypes = stack;
- numLocals = nl;
- localsTypes = locals;
- }
-
- /*
- * Computes the correct value of numLocals.
- */
- public void resetNumLocals() {
- if (localsTypes != null) {
- int nl = localsTypes.length;
- while (nl > 0 && localsTypes[nl - 1].isBasicType() == TypeTag.TOP) {
- if (nl > 1) {
- if (localsTypes[nl - 2].is2WordType())
- break;
- }
-
- --nl;
- }
-
- numLocals = nl;
- }
- }
-
- public static class Maker extends BasicBlock.Maker {
- protected BasicBlock makeBlock(int pos) {
- return new TypedBlock(pos);
- }
-
- protected BasicBlock[] makeArray(int size) {
- return new TypedBlock[size];
- }
- }
-
- /**
- * Initializes the first block by the given method descriptor.
- *
- * @param block the first basic block that this method initializes.
- * @param className a dot-separated fully qualified class name.
- * For example, <code>javassist.bytecode.stackmap.BasicBlock</code>.
- * @param methodDesc method descriptor.
- * @param isStatic true if the method is a static method.
- * @param isConstructor true if the method is a constructor.
- */
- void initFirstBlock(int maxStack, int maxLocals, String className,
- String methodDesc, boolean isStatic, boolean isConstructor)
- throws BadBytecode
- {
- if (methodDesc.charAt(0) != '(')
- throw new BadBytecode("no method descriptor: " + methodDesc);
-
- stackTop = 0;
- stackTypes = TypeData.make(maxStack);
- TypeData[] locals = TypeData.make(maxLocals);
- if (isConstructor)
- locals[0] = new TypeData.UninitThis(className);
- else if (!isStatic)
- locals[0] = new TypeData.ClassName(className);
-
- int n = isStatic ? -1 : 0;
- int i = 1;
- try {
- while ((i = descToTag(methodDesc, i, ++n, locals)) > 0)
- if (locals[n].is2WordType())
- locals[++n] = TypeTag.TOP;
- }
- catch (StringIndexOutOfBoundsException e) {
- throw new BadBytecode("bad method descriptor: "
- + methodDesc);
- }
-
- numLocals = n;
- localsTypes = locals;
- }
-
- private static int descToTag(String desc, int i,
- int n, TypeData[] types)
- throws BadBytecode
- {
- int i0 = i;
- int arrayDim = 0;
- char c = desc.charAt(i);
- if (c == ')')
- return 0;
-
- while (c == '[') {
- ++arrayDim;
- c = desc.charAt(++i);
- }
-
- if (c == 'L') {
- int i2 = desc.indexOf(';', ++i);
- if (arrayDim > 0)
- types[n] = new TypeData.ClassName(desc.substring(i0, ++i2));
- else
- types[n] = new TypeData.ClassName(desc.substring(i0 + 1, ++i2 - 1)
- .replace('/', '.'));
- return i2;
- }
- else if (arrayDim > 0) {
- types[n] = new TypeData.ClassName(desc.substring(i0, ++i));
- return i;
- }
- else {
- TypeData t = toPrimitiveTag(c);
- if (t == null)
- throw new BadBytecode("bad method descriptor: " + desc);
-
- types[n] = t;
- return i + 1;
- }
- }
-
- private static TypeData toPrimitiveTag(char c) {
- switch (c) {
- case 'Z' :
- case 'C' :
- case 'B' :
- case 'S' :
- case 'I' :
- return TypeTag.INTEGER;
- case 'J' :
- return TypeTag.LONG;
- case 'F' :
- return TypeTag.FLOAT;
- case 'D' :
- return TypeTag.DOUBLE;
- case 'V' :
- default :
- return null;
- }
- }
-
- public static String getRetType(String desc) {
- int i = desc.indexOf(')');
- if (i < 0)
- return "java.lang.Object";
-
- char c = desc.charAt(i + 1);
- if (c == '[')
- return desc.substring(i + 1);
- else if (c == 'L')
- return desc.substring(i + 2, desc.length() - 1).replace('/', '.');
- else
- return "java.lang.Object";
- }
- }
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