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ClassFileWriter.java
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4568 lines (4289 loc) · 164 KB
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/* -*- Mode: java; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
package org.mozilla.classfile;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Arrays;
import org.mozilla.javascript.ObjArray;
import org.mozilla.javascript.UintMap;
/**
* ClassFileWriter
*
* A ClassFileWriter is used to write a Java class file. Methods are
* provided to create fields and methods, and within methods to write
* Java bytecodes.
*
* @author Roger Lawrence
*/
public class ClassFileWriter {
/**
* Thrown for cases where the error in generating the class file is due to a program size
* constraints rather than a likely bug in the compiler.
*/
public static class ClassFileFormatException extends RuntimeException {
private static final long serialVersionUID = 1263998431033790599L;
ClassFileFormatException(String message) {
super(message);
}
}
/**
* Construct a ClassFileWriter for a class.
*
* @param className the name of the class to write, including full package qualification.
* @param superClassName the name of the superclass of the class to write, including full package
* qualification.
* @param sourceFileName the name of the source file to use for producing debug information, or
* null if debug information is not desired
*/
public ClassFileWriter(String className, String superClassName, String sourceFileName) {
generatedClassName = className;
itsConstantPool = new ConstantPool(this);
itsThisClassIndex = itsConstantPool.addClass(className);
itsSuperClassIndex = itsConstantPool.addClass(superClassName);
if (sourceFileName != null)
itsSourceFileNameIndex = itsConstantPool.addUtf8(sourceFileName);
// All "new" implementations are supposed to output ACC_SUPER as a
// class flag. This is specified in the first JVM spec, so it should
// be old enough that it's okay to always set it.
itsFlags = ACC_PUBLIC | ACC_SUPER;
}
public final String getClassName() {
return generatedClassName;
}
/**
* Add an interface implemented by this class.
*
* This method may be called multiple times for classes that implement multiple interfaces.
*
* @param interfaceName a name of an interface implemented by the class being written, including
* full package qualification.
*/
public void addInterface(String interfaceName) {
short interfaceIndex = itsConstantPool.addClass(interfaceName);
itsInterfaces.add(Short.valueOf(interfaceIndex));
}
public static final short
ACC_PUBLIC = 0x0001,
ACC_PRIVATE = 0x0002,
ACC_PROTECTED = 0x0004,
ACC_STATIC = 0x0008,
ACC_FINAL = 0x0010,
ACC_SUPER = 0x0020,
ACC_SYNCHRONIZED = 0x0020,
ACC_VOLATILE = 0x0040,
ACC_TRANSIENT = 0x0080,
ACC_NATIVE = 0x0100,
ACC_ABSTRACT = 0x0400;
/**
* Set the class's flags.
*
* Flags must be a set of the following flags, bitwise or'd together: ACC_PUBLIC ACC_PRIVATE
* ACC_PROTECTED ACC_FINAL ACC_ABSTRACT TODO: check that this is the appropriate set
*
* @param flags the set of class flags to set
*/
public void setFlags(short flags) {
itsFlags = flags;
}
static String getSlashedForm(String name) {
return name.replace('.', '/');
}
/**
* Convert Java class name in dot notation into "Lname-with-dots-replaced-by-slashes;" form
* suitable for use as JVM type signatures.
*/
public static String classNameToSignature(String name) {
int nameLength = name.length();
int colonPos = 1 + nameLength;
char[] buf = new char[colonPos + 1];
buf[0] = 'L';
buf[colonPos] = ';';
name.getChars(0, nameLength, buf, 1);
for (int i = 1; i != colonPos; ++i) {
if (buf[i] == '.') {
buf[i] = '/';
}
}
return new String(buf, 0, colonPos + 1);
}
/**
* Add a field to the class.
*
* @param fieldName the name of the field
* @param type the type of the field using ...
* @param flags the attributes of the field, such as ACC_PUBLIC, etc. bitwise or'd together
*/
public void addField(String fieldName, String type, short flags) {
short fieldNameIndex = itsConstantPool.addUtf8(fieldName);
short typeIndex = itsConstantPool.addUtf8(type);
itsFields.add(new ClassFileField(fieldNameIndex, typeIndex, flags));
}
/**
* Add a field to the class.
*
* @param fieldName the name of the field
* @param type the type of the field using ...
* @param flags the attributes of the field, such as ACC_PUBLIC, etc. bitwise or'd together
* @param value an initial integral value
*/
public void addField(String fieldName, String type, short flags,
int value) {
short fieldNameIndex = itsConstantPool.addUtf8(fieldName);
short typeIndex = itsConstantPool.addUtf8(type);
ClassFileField field = new ClassFileField(fieldNameIndex, typeIndex,
flags);
field.setAttributes(itsConstantPool.addUtf8("ConstantValue"),
(short) 0,
(short) 0,
itsConstantPool.addConstant(value));
itsFields.add(field);
}
/**
* Add a field to the class.
*
* @param fieldName the name of the field
* @param type the type of the field using ...
* @param flags the attributes of the field, such as ACC_PUBLIC, etc. bitwise or'd together
* @param value an initial long value
*/
public void addField(String fieldName, String type, short flags,
long value) {
short fieldNameIndex = itsConstantPool.addUtf8(fieldName);
short typeIndex = itsConstantPool.addUtf8(type);
ClassFileField field = new ClassFileField(fieldNameIndex, typeIndex,
flags);
field.setAttributes(itsConstantPool.addUtf8("ConstantValue"),
(short) 0,
(short) 2,
itsConstantPool.addConstant(value));
itsFields.add(field);
}
/**
* Add a field to the class.
*
* @param fieldName the name of the field
* @param type the type of the field using ...
* @param flags the attributes of the field, such as ACC_PUBLIC, etc. bitwise or'd together
* @param value an initial double value
*/
public void addField(String fieldName, String type, short flags,
double value) {
short fieldNameIndex = itsConstantPool.addUtf8(fieldName);
short typeIndex = itsConstantPool.addUtf8(type);
ClassFileField field = new ClassFileField(fieldNameIndex, typeIndex,
flags);
field.setAttributes(itsConstantPool.addUtf8("ConstantValue"),
(short) 0,
(short) 2,
itsConstantPool.addConstant(value));
itsFields.add(field);
}
/**
* Add Information about java variable to use when generating the local variable table.
*
* @param name variable name.
* @param type variable type as bytecode descriptor string.
* @param startPC the starting bytecode PC where this variable is live, or -1 if it does not have
* a Java register.
* @param register the Java register number of variable or -1 if it does not have a Java
* register.
*/
public void addVariableDescriptor(String name, String type, int startPC, int register) {
int nameIndex = itsConstantPool.addUtf8(name);
int descriptorIndex = itsConstantPool.addUtf8(type);
int[] chunk = {nameIndex, descriptorIndex, startPC, register};
if (itsVarDescriptors == null) {
itsVarDescriptors = new ObjArray();
}
itsVarDescriptors.add(chunk);
}
/**
* Add a method and begin adding code.
*
* This method must be called before other methods for adding code, exception tables, etc. can be
* invoked.
*
* @param methodName the name of the method
* @param type a string representing the type
* @param flags the attributes of the field, such as ACC_PUBLIC, etc. bitwise or'd together
*/
public void startMethod(String methodName, String type, short flags) {
short methodNameIndex = itsConstantPool.addUtf8(methodName);
short typeIndex = itsConstantPool.addUtf8(type);
itsCurrentMethod = new ClassFileMethod(methodName, methodNameIndex,
type, typeIndex, flags);
itsJumpFroms = new UintMap();
itsMethods.add(itsCurrentMethod);
addSuperBlockStart(0);
}
/**
* Complete generation of the method.
*
* After this method is called, no more code can be added to the method begun with
* <code>startMethod</code>.
*
* @param maxLocals the maximum number of local variable slots (a.k.a. Java registers) used by the
* method
*/
public void stopMethod(short maxLocals) {
if (itsCurrentMethod == null)
throw new IllegalStateException("No method to stop");
fixLabelGotos();
itsMaxLocals = maxLocals;
StackMapTable stackMap = null;
if (GenerateStackMap) {
finalizeSuperBlockStarts();
stackMap = new StackMapTable();
stackMap.generate();
}
int lineNumberTableLength = 0;
if (itsLineNumberTable != null) {
// 6 bytes for the attribute header
// 2 bytes for the line number count
// 4 bytes for each entry
lineNumberTableLength = 6 + 2 + (itsLineNumberTableTop * 4);
}
int variableTableLength = 0;
if (itsVarDescriptors != null) {
// 6 bytes for the attribute header
// 2 bytes for the variable count
// 10 bytes for each entry
variableTableLength = 6 + 2 + (itsVarDescriptors.size() * 10);
}
int stackMapTableLength = 0;
if (stackMap != null) {
int stackMapWriteSize = stackMap.computeWriteSize();
if (stackMapWriteSize > 0) {
stackMapTableLength = 6 + stackMapWriteSize;
}
}
int attrLength = 2 + // attribute_name_index
4 + // attribute_length
2 + // max_stack
2 + // max_locals
4 + // code_length
itsCodeBufferTop +
2 + // exception_table_length
(itsExceptionTableTop * 8) +
2 + // attributes_count
lineNumberTableLength +
variableTableLength +
stackMapTableLength;
if (attrLength > 65536) {
// See http://java.sun.com/docs/books/jvms/second_edition/html/ClassFile.doc.html,
// section 4.10, "The amount of code per non-native, non-abstract
// method is limited to 65536 bytes...
throw new ClassFileFormatException("generated bytecode for method exceeds 64K limit.");
}
byte[] codeAttribute = new byte[attrLength];
int index = 0;
int codeAttrIndex = itsConstantPool.addUtf8("Code");
index = putInt16(codeAttrIndex, codeAttribute, index);
attrLength -= 6; // discount the attribute header
index = putInt32(attrLength, codeAttribute, index);
index = putInt16(itsMaxStack, codeAttribute, index);
index = putInt16(itsMaxLocals, codeAttribute, index);
index = putInt32(itsCodeBufferTop, codeAttribute, index);
System.arraycopy(itsCodeBuffer, 0, codeAttribute, index,
itsCodeBufferTop);
index += itsCodeBufferTop;
if (itsExceptionTableTop > 0) {
index = putInt16(itsExceptionTableTop, codeAttribute, index);
for (int i = 0; i < itsExceptionTableTop; i++) {
ExceptionTableEntry ete = itsExceptionTable[i];
int startPC = getLabelPC(ete.itsStartLabel);
int endPC = getLabelPC(ete.itsEndLabel);
int handlerPC = getLabelPC(ete.itsHandlerLabel);
short catchType = ete.itsCatchType;
if (startPC == -1)
throw new IllegalStateException("start label not defined");
if (endPC == -1)
throw new IllegalStateException("end label not defined");
if (handlerPC == -1)
throw new IllegalStateException(
"handler label not defined");
// no need to cast to short here, the putInt16 uses only
// the short part of the int
index = putInt16(startPC, codeAttribute, index);
index = putInt16(endPC, codeAttribute, index);
index = putInt16(handlerPC, codeAttribute, index);
index = putInt16(catchType, codeAttribute, index);
}
} else {
// write 0 as exception table length
index = putInt16(0, codeAttribute, index);
}
int attributeCount = 0;
if (itsLineNumberTable != null)
attributeCount++;
if (itsVarDescriptors != null)
attributeCount++;
if (stackMapTableLength > 0) {
attributeCount++;
}
index = putInt16(attributeCount, codeAttribute, index);
if (itsLineNumberTable != null) {
int lineNumberTableAttrIndex
= itsConstantPool.addUtf8("LineNumberTable");
index = putInt16(lineNumberTableAttrIndex, codeAttribute, index);
int tableAttrLength = 2 + (itsLineNumberTableTop * 4);
index = putInt32(tableAttrLength, codeAttribute, index);
index = putInt16(itsLineNumberTableTop, codeAttribute, index);
for (int i = 0; i < itsLineNumberTableTop; i++) {
index = putInt32(itsLineNumberTable[i], codeAttribute, index);
}
}
if (itsVarDescriptors != null) {
int variableTableAttrIndex
= itsConstantPool.addUtf8("LocalVariableTable");
index = putInt16(variableTableAttrIndex, codeAttribute, index);
int varCount = itsVarDescriptors.size();
int tableAttrLength = 2 + (varCount * 10);
index = putInt32(tableAttrLength, codeAttribute, index);
index = putInt16(varCount, codeAttribute, index);
for (int i = 0; i < varCount; i++) {
int[] chunk = (int[]) itsVarDescriptors.get(i);
int nameIndex = chunk[0];
int descriptorIndex = chunk[1];
int startPC = chunk[2];
int register = chunk[3];
int length = itsCodeBufferTop - startPC;
index = putInt16(startPC, codeAttribute, index);
index = putInt16(length, codeAttribute, index);
index = putInt16(nameIndex, codeAttribute, index);
index = putInt16(descriptorIndex, codeAttribute, index);
index = putInt16(register, codeAttribute, index);
}
}
if (stackMapTableLength > 0) {
int stackMapTableAttrIndex =
itsConstantPool.addUtf8("StackMapTable");
index = putInt16(stackMapTableAttrIndex, codeAttribute, index);
index = stackMap.write(codeAttribute, index);
}
itsCurrentMethod.setCodeAttribute(codeAttribute);
itsExceptionTable = null;
itsExceptionTableTop = 0;
itsLineNumberTableTop = 0;
itsCodeBufferTop = 0;
itsCurrentMethod = null;
itsMaxStack = 0;
itsStackTop = 0;
itsLabelTableTop = 0;
itsFixupTableTop = 0;
itsVarDescriptors = null;
itsSuperBlockStarts = null;
itsSuperBlockStartsTop = 0;
itsJumpFroms = null;
}
/**
* Add the single-byte opcode to the current method.
*
* @param theOpCode the opcode of the bytecode
*/
public void add(int theOpCode) {
if (opcodeCount(theOpCode) != 0)
throw new IllegalArgumentException("Unexpected operands");
int newStack = itsStackTop + stackChange(theOpCode);
if (newStack < 0 || Short.MAX_VALUE < newStack)
badStack(newStack);
if (DEBUGCODE)
System.out.println("Add " + bytecodeStr(theOpCode));
addToCodeBuffer(theOpCode);
itsStackTop = (short) newStack;
if (newStack > itsMaxStack)
itsMaxStack = (short) newStack;
if (DEBUGSTACK) {
System.out.println("After " + bytecodeStr(theOpCode)
+ " stack = " + itsStackTop);
}
if (theOpCode == ByteCode.ATHROW) {
addSuperBlockStart(itsCodeBufferTop);
}
}
/**
* Add a single-operand opcode to the current method.
*
* @param theOpCode the opcode of the bytecode
* @param theOperand the operand of the bytecode
*/
public void add(int theOpCode, int theOperand) {
if (DEBUGCODE) {
System.out.println("Add " + bytecodeStr(theOpCode)
+ ", " + Integer.toHexString(theOperand));
}
int newStack = itsStackTop + stackChange(theOpCode);
if (newStack < 0 || Short.MAX_VALUE < newStack)
badStack(newStack);
switch (theOpCode) {
case ByteCode.GOTO:
// This is necessary because dead code is seemingly being
// generated and Sun's verifier is expecting type state to be
// placed even at dead blocks of code.
addSuperBlockStart(itsCodeBufferTop + 3);
// fall through...
case ByteCode.IFEQ:
case ByteCode.IFNE:
case ByteCode.IFLT:
case ByteCode.IFGE:
case ByteCode.IFGT:
case ByteCode.IFLE:
case ByteCode.IF_ICMPEQ:
case ByteCode.IF_ICMPNE:
case ByteCode.IF_ICMPLT:
case ByteCode.IF_ICMPGE:
case ByteCode.IF_ICMPGT:
case ByteCode.IF_ICMPLE:
case ByteCode.IF_ACMPEQ:
case ByteCode.IF_ACMPNE:
case ByteCode.JSR:
case ByteCode.IFNULL:
case ByteCode.IFNONNULL: {
if ((theOperand & 0x80000000) != 0x80000000) {
if ((theOperand < 0) || (theOperand > 65535))
throw new IllegalArgumentException(
"Bad label for branch");
}
int branchPC = itsCodeBufferTop;
addToCodeBuffer(theOpCode);
if ((theOperand & 0x80000000) != 0x80000000) {
// hard displacement
addToCodeInt16(theOperand);
int target = theOperand + branchPC;
addSuperBlockStart(target);
itsJumpFroms.put(target, branchPC);
} else { // a label
int targetPC = getLabelPC(theOperand);
if (DEBUGLABELS) {
int theLabel = theOperand & 0x7FFFFFFF;
System.out.println("Fixing branch to " +
theLabel + " at " + targetPC +
" from " + branchPC);
}
if (targetPC != -1) {
int offset = targetPC - branchPC;
addToCodeInt16(offset);
addSuperBlockStart(targetPC);
itsJumpFroms.put(targetPC, branchPC);
} else {
addLabelFixup(theOperand, branchPC + 1);
addToCodeInt16(0);
}
}
}
break;
case ByteCode.BIPUSH:
if ((byte) theOperand != theOperand)
throw new IllegalArgumentException("out of range byte");
addToCodeBuffer(theOpCode);
addToCodeBuffer((byte) theOperand);
break;
case ByteCode.SIPUSH:
if ((short) theOperand != theOperand)
throw new IllegalArgumentException("out of range short");
addToCodeBuffer(theOpCode);
addToCodeInt16(theOperand);
break;
case ByteCode.NEWARRAY:
if (!(0 <= theOperand && theOperand < 256))
throw new IllegalArgumentException("out of range index");
addToCodeBuffer(theOpCode);
addToCodeBuffer(theOperand);
break;
case ByteCode.GETFIELD:
case ByteCode.PUTFIELD:
if (!(0 <= theOperand && theOperand < 65536))
throw new IllegalArgumentException("out of range field");
addToCodeBuffer(theOpCode);
addToCodeInt16(theOperand);
break;
case ByteCode.LDC:
case ByteCode.LDC_W:
case ByteCode.LDC2_W:
if (!(0 <= theOperand && theOperand < 65536))
throw new ClassFileFormatException("out of range index");
if (theOperand >= 256
|| theOpCode == ByteCode.LDC_W
|| theOpCode == ByteCode.LDC2_W) {
if (theOpCode == ByteCode.LDC) {
addToCodeBuffer(ByteCode.LDC_W);
} else {
addToCodeBuffer(theOpCode);
}
addToCodeInt16(theOperand);
} else {
addToCodeBuffer(theOpCode);
addToCodeBuffer(theOperand);
}
break;
case ByteCode.RET:
case ByteCode.ILOAD:
case ByteCode.LLOAD:
case ByteCode.FLOAD:
case ByteCode.DLOAD:
case ByteCode.ALOAD:
case ByteCode.ISTORE:
case ByteCode.LSTORE:
case ByteCode.FSTORE:
case ByteCode.DSTORE:
case ByteCode.ASTORE:
if (theOperand < 0 || 65536 <= theOperand)
throw new ClassFileFormatException("out of range variable");
if (theOperand >= 256) {
addToCodeBuffer(ByteCode.WIDE);
addToCodeBuffer(theOpCode);
addToCodeInt16(theOperand);
} else {
addToCodeBuffer(theOpCode);
addToCodeBuffer(theOperand);
}
break;
default:
throw new IllegalArgumentException(
"Unexpected opcode for 1 operand");
}
itsStackTop = (short) newStack;
if (newStack > itsMaxStack)
itsMaxStack = (short) newStack;
if (DEBUGSTACK) {
System.out.println("After " + bytecodeStr(theOpCode)
+ " stack = " + itsStackTop);
}
}
/**
* Generate the load constant bytecode for the given integer.
*
* @param k the constant
*/
public void addLoadConstant(int k) {
switch (k) {
case 0:
add(ByteCode.ICONST_0);
break;
case 1:
add(ByteCode.ICONST_1);
break;
case 2:
add(ByteCode.ICONST_2);
break;
case 3:
add(ByteCode.ICONST_3);
break;
case 4:
add(ByteCode.ICONST_4);
break;
case 5:
add(ByteCode.ICONST_5);
break;
default:
add(ByteCode.LDC, itsConstantPool.addConstant(k));
break;
}
}
/**
* Generate the load constant bytecode for the given long.
*
* @param k the constant
*/
public void addLoadConstant(long k) {
add(ByteCode.LDC2_W, itsConstantPool.addConstant(k));
}
/**
* Generate the load constant bytecode for the given float.
*
* @param k the constant
*/
public void addLoadConstant(float k) {
add(ByteCode.LDC, itsConstantPool.addConstant(k));
}
/**
* Generate the load constant bytecode for the given double.
*
* @param k the constant
*/
public void addLoadConstant(double k) {
add(ByteCode.LDC2_W, itsConstantPool.addConstant(k));
}
/**
* Generate the load constant bytecode for the given string.
*
* @param k the constant
*/
public void addLoadConstant(String k) {
add(ByteCode.LDC, itsConstantPool.addConstant(k));
}
/**
* Add the given two-operand bytecode to the current method.
*
* @param theOpCode the opcode of the bytecode
* @param theOperand1 the first operand of the bytecode
* @param theOperand2 the second operand of the bytecode
*/
public void add(int theOpCode, int theOperand1, int theOperand2) {
if (DEBUGCODE) {
System.out.println("Add " + bytecodeStr(theOpCode)
+ ", " + Integer.toHexString(theOperand1)
+ ", " + Integer.toHexString(theOperand2));
}
int newStack = itsStackTop + stackChange(theOpCode);
if (newStack < 0 || Short.MAX_VALUE < newStack)
badStack(newStack);
if (theOpCode == ByteCode.IINC) {
if (theOperand1 < 0 || 65536 <= theOperand1)
throw new ClassFileFormatException("out of range variable");
if (theOperand2 < 0 || 65536 <= theOperand2)
throw new ClassFileFormatException("out of range increment");
if (theOperand1 > 255 || theOperand2 > 127) {
addToCodeBuffer(ByteCode.WIDE);
addToCodeBuffer(ByteCode.IINC);
addToCodeInt16(theOperand1);
addToCodeInt16(theOperand2);
} else {
addToCodeBuffer(ByteCode.IINC);
addToCodeBuffer(theOperand1);
addToCodeBuffer(theOperand2);
}
} else if (theOpCode == ByteCode.MULTIANEWARRAY) {
if (!(0 <= theOperand1 && theOperand1 < 65536))
throw new IllegalArgumentException("out of range index");
if (!(0 <= theOperand2 && theOperand2 < 256))
throw new IllegalArgumentException("out of range dimensions");
addToCodeBuffer(ByteCode.MULTIANEWARRAY);
addToCodeInt16(theOperand1);
addToCodeBuffer(theOperand2);
} else {
throw new IllegalArgumentException(
"Unexpected opcode for 2 operands");
}
itsStackTop = (short) newStack;
if (newStack > itsMaxStack)
itsMaxStack = (short) newStack;
if (DEBUGSTACK) {
System.out.println("After " + bytecodeStr(theOpCode)
+ " stack = " + itsStackTop);
}
}
public void add(int theOpCode, String className) {
if (DEBUGCODE) {
System.out.println("Add " + bytecodeStr(theOpCode)
+ ", " + className);
}
int newStack = itsStackTop + stackChange(theOpCode);
if (newStack < 0 || Short.MAX_VALUE < newStack)
badStack(newStack);
switch (theOpCode) {
case ByteCode.NEW:
case ByteCode.ANEWARRAY:
case ByteCode.CHECKCAST:
case ByteCode.INSTANCEOF: {
short classIndex = itsConstantPool.addClass(className);
addToCodeBuffer(theOpCode);
addToCodeInt16(classIndex);
}
break;
default:
throw new IllegalArgumentException(
"bad opcode for class reference");
}
itsStackTop = (short) newStack;
if (newStack > itsMaxStack)
itsMaxStack = (short) newStack;
if (DEBUGSTACK) {
System.out.println("After " + bytecodeStr(theOpCode)
+ " stack = " + itsStackTop);
}
}
public void add(int theOpCode, String className, String fieldName,
String fieldType) {
if (DEBUGCODE) {
System.out.println("Add " + bytecodeStr(theOpCode)
+ ", " + className + ", " + fieldName + ", " + fieldType);
}
int newStack = itsStackTop + stackChange(theOpCode);
char fieldTypeChar = fieldType.charAt(0);
int fieldSize = (fieldTypeChar == 'J' || fieldTypeChar == 'D')
? 2 : 1;
switch (theOpCode) {
case ByteCode.GETFIELD:
case ByteCode.GETSTATIC:
newStack += fieldSize;
break;
case ByteCode.PUTSTATIC:
case ByteCode.PUTFIELD:
newStack -= fieldSize;
break;
default:
throw new IllegalArgumentException(
"bad opcode for field reference");
}
if (newStack < 0 || Short.MAX_VALUE < newStack)
badStack(newStack);
short fieldRefIndex = itsConstantPool.addFieldRef(className,
fieldName, fieldType);
addToCodeBuffer(theOpCode);
addToCodeInt16(fieldRefIndex);
itsStackTop = (short) newStack;
if (newStack > itsMaxStack)
itsMaxStack = (short) newStack;
if (DEBUGSTACK) {
System.out.println("After " + bytecodeStr(theOpCode)
+ " stack = " + itsStackTop);
}
}
public void addInvoke(int theOpCode, String className, String methodName,
String methodType) {
if (DEBUGCODE) {
System.out.println("Add " + bytecodeStr(theOpCode)
+ ", " + className + ", " + methodName + ", "
+ methodType);
}
int parameterInfo = sizeOfParameters(methodType);
int parameterCount = parameterInfo >>> 16;
int stackDiff = (short) parameterInfo;
int newStack = itsStackTop + stackDiff;
newStack += stackChange(theOpCode); // adjusts for 'this'
if (newStack < 0 || Short.MAX_VALUE < newStack)
badStack(newStack);
switch (theOpCode) {
case ByteCode.INVOKEVIRTUAL:
case ByteCode.INVOKESPECIAL:
case ByteCode.INVOKESTATIC:
case ByteCode.INVOKEINTERFACE: {
addToCodeBuffer(theOpCode);
if (theOpCode == ByteCode.INVOKEINTERFACE) {
short ifMethodRefIndex
= itsConstantPool.addInterfaceMethodRef(
className, methodName,
methodType);
addToCodeInt16(ifMethodRefIndex);
addToCodeBuffer(parameterCount + 1);
addToCodeBuffer(0);
} else {
short methodRefIndex = itsConstantPool.addMethodRef(
className, methodName,
methodType);
addToCodeInt16(methodRefIndex);
}
}
break;
default:
throw new IllegalArgumentException(
"bad opcode for method reference");
}
itsStackTop = (short) newStack;
if (newStack > itsMaxStack)
itsMaxStack = (short) newStack;
if (DEBUGSTACK) {
System.out.println("After " + bytecodeStr(theOpCode)
+ " stack = " + itsStackTop);
}
}
public void addInvokeDynamic(String methodName, String methodType,
MHandle bsm, Object... bsmArgs) {
if (DEBUGCODE) {
System.out.println("Add invokedynamic, " + methodName + ", " + methodType);
}
// JDK 1.7 major class file version is required for invokedynamic
if (MajorVersion < 51) {
throw new RuntimeException(
"Please build and run with JDK 1.7 for invokedynamic support");
}
int parameterInfo = sizeOfParameters(methodType);
// int parameterCount = parameterInfo >>> 16;
int stackDiff = (short) parameterInfo;
int newStack = itsStackTop + stackDiff;
if (newStack < 0 || Short.MAX_VALUE < newStack)
badStack(newStack);
BootstrapEntry bsmEntry = new BootstrapEntry(bsm, bsmArgs);
if (itsBootstrapMethods == null) {
itsBootstrapMethods = new ObjArray();
}
int bootstrapIndex = itsBootstrapMethods.indexOf(bsmEntry);
if (bootstrapIndex == -1) {
bootstrapIndex = itsBootstrapMethods.size();
itsBootstrapMethods.add(bsmEntry);
itsBootstrapMethodsLength += bsmEntry.code.length;
}
short invokedynamicIndex = itsConstantPool.addInvokeDynamic(
methodName, methodType, bootstrapIndex);
addToCodeBuffer(ByteCode.INVOKEDYNAMIC);
addToCodeInt16(invokedynamicIndex);
addToCodeInt16(0);
itsStackTop = (short) newStack;
if (newStack > itsMaxStack)
itsMaxStack = (short) newStack;
if (DEBUGSTACK) {
System.out.println("After invokedynamic stack = " + itsStackTop);
}
}
/**
* Generate code to load the given integer on stack.
*
* @param k the constant
*/
public void addPush(int k) {
if ((byte) k == k) {
if (k == -1) {
add(ByteCode.ICONST_M1);
} else if (0 <= k && k <= 5) {
add((byte) (ByteCode.ICONST_0 + k));
} else {
add(ByteCode.BIPUSH, (byte) k);
}
} else if ((short) k == k) {
add(ByteCode.SIPUSH, (short) k);
} else {
addLoadConstant(k);
}
}
public void addPush(boolean k) {
add(k ? ByteCode.ICONST_1 : ByteCode.ICONST_0);
}
/**
* Generate code to load the given long on stack.
*
* @param k the constant
*/
public void addPush(long k) {
int ik = (int) k;
if (ik == k) {
addPush(ik);
add(ByteCode.I2L);
} else {
addLoadConstant(k);
}
}
/**
* Generate code to load the given double on stack.
*
* @param k the constant
*/
public void addPush(double k) {
if (k == 0.0) {
// zero
add(ByteCode.DCONST_0);
if (1.0 / k < 0) {
// Negative zero
add(ByteCode.DNEG);
}
} else if (k == 1.0 || k == -1.0) {
add(ByteCode.DCONST_1);
if (k < 0) {
add(ByteCode.DNEG);
}
} else {
addLoadConstant(k);
}
}
/**
* Generate the code to leave on stack the given string even if the string encoding exeeds the
* class file limit for single string constant
*
* @param k the constant
*/
public void addPush(String k) {
int length = k.length();
int limit = itsConstantPool.getUtfEncodingLimit(k, 0, length);
if (limit == length) {
addLoadConstant(k);
return;
}
// Split string into picies fitting the UTF limit and generate code for
// StringBuilder sb = new StringBuilder(length);
// sb.append(loadConstant(piece_1));
// ...
// sb.append(loadConstant(piece_N));
// sb.toString();
final String SB = "java/lang/StringBuilder";
add(ByteCode.NEW, SB);
add(ByteCode.DUP);
addPush(length);
addInvoke(ByteCode.INVOKESPECIAL, SB, "<init>", "(I)V");
int cursor = 0;
for (; ; ) {
add(ByteCode.DUP);
String s = k.substring(cursor, limit);
addLoadConstant(s);
addInvoke(ByteCode.INVOKEVIRTUAL, SB, "append",
"(Ljava/lang/String;)Ljava/lang/StringBuilder;");
add(ByteCode.POP);
if (limit == length) {
break;
}
cursor = limit;
limit = itsConstantPool.getUtfEncodingLimit(k, limit, length);