Scala example source code file (JCode.java)
The Scala JCode.java source code/* FJBG -- Fast Java Bytecode Generator
* Copyright 2002-2011 LAMP/EPFL
* @author Michel Schinz
*/
package ch.epfl.lamp.fjbg;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.util.*;
import ch.epfl.lamp.util.ByteArray;
/**
* List of instructions, to which Java byte-code instructions can be added.
*
* @author Michel Schinz, Thomas Friedli
* @version 1.0
*/
public class JCode {
protected boolean frozen = false;
protected final FJBGContext context;
protected final JMethod owner;
protected final ByteArray codeArray;
protected final LinkedList/*<ExceptionHandler>*/ exceptionHandlers =
new LinkedList();
protected final JConstantPool pool;
protected final ArrayList/*<OffsetToPatch>*/ offsetToPatch =
new ArrayList();
protected static int UNKNOWN_STACK_SIZE = Integer.MIN_VALUE;
protected int maxStackSize = UNKNOWN_STACK_SIZE;
protected int[] stackProduction = null;
protected int[] stackSizes;
protected JCode(FJBGContext context, JClass clazz, JMethod owner) {
this.context = context;
this.pool = clazz.getConstantPool();
this.owner = owner;
this.codeArray = new ByteArray();
}
protected JCode(FJBGContext context,
JClass clazz,
JMethod owner,
DataInputStream stream)
throws IOException {
this.context = context;
this.pool = clazz.getConstantPool();
this.owner = owner;
owner.setCode(this);
int size = stream.readInt();
if (size >= 65536) // section 4.10
throw new Error("code size must be less than 65536: " + size);
this.codeArray = new ByteArray(stream, size);
}
/**
* Gets the program counter, which is defined as the address of the
* next instruction.
* @return The int representing the value of the program counter
*/
public int getPC() {
return codeArray.getSize();
}
/**
* Gets the size of the code
* @return The number of bytes of the code
*/
public int getSize() {
return codeArray.getSize();
}
/**
* Gets the method to which the code belongs
* @return The method to which the code belongs
*/
public JMethod getOwner() {
return owner;
}
// Stack size
public int getMaxStackSize() {
if (maxStackSize == UNKNOWN_STACK_SIZE)
maxStackSize = computeMaxStackSize();
return maxStackSize;
}
// Freezing
//////////////////////////////////////////////////////////////////////
public void freeze() throws OffsetTooBigException {
assert !frozen;
patchAllOffset();
codeArray.freeze();
frozen = true;
}
// Attributes
//////////////////////////////////////////////////////////////////////
protected final LinkedList/*<JAttribute>*/ attributes = new LinkedList();
public void addAttribute(JAttribute attr) {
attributes.add(attr);
}
public List/*<JAttribute>*/ getAttributes() {
return attributes;
}
// Emitting code
//////////////////////////////////////////////////////////////////////
public void emit(JOpcode opcode) {
setStackProduction(getPC(), opcode);
codeArray.addU1(opcode.code);
}
public void emitNOP() { emit(JOpcode.NOP); }
// Constant loading.
public void emitACONST_NULL() { emit(JOpcode.ACONST_NULL); }
public void emitICONST_M1() { emit(JOpcode.ICONST_M1); }
public void emitICONST_0() { emit(JOpcode.ICONST_0); }
public void emitICONST_1() { emit(JOpcode.ICONST_1); }
public void emitICONST_2() { emit(JOpcode.ICONST_2); }
public void emitICONST_3() { emit(JOpcode.ICONST_3); }
public void emitICONST_4() { emit(JOpcode.ICONST_4); }
public void emitICONST_5() { emit(JOpcode.ICONST_5); }
public void emitLCONST_0() { emit(JOpcode.LCONST_0); }
public void emitLCONST_1() { emit(JOpcode.LCONST_1); }
public void emitFCONST_0() { emit(JOpcode.FCONST_0); }
public void emitFCONST_1() { emit(JOpcode.FCONST_1); }
public void emitFCONST_2() { emit(JOpcode.FCONST_2); }
public void emitDCONST_0() { emit(JOpcode.DCONST_0); }
public void emitDCONST_1() { emit(JOpcode.DCONST_1); }
public void emitBIPUSH(int b) { emitU1(JOpcode.BIPUSH, b); }
public void emitSIPUSH(int s) { emitU2(JOpcode.SIPUSH, s); }
public void emitLDC(int value) {
emitU1(JOpcode.LDC, pool.addInteger(value));
}
public void emitLDC(float value) {
emitU1(JOpcode.LDC, pool.addFloat(value));
}
public void emitLDC(String value) {
emitU1(JOpcode.LDC, pool.addString(value));
}
public void emitLDC_W(int value) {
emitU1(JOpcode.LDC_W, pool.addInteger(value));
}
public void emitLDC_W(float value) {
emitU1(JOpcode.LDC_W, pool.addFloat(value));
}
public void emitLDC_W(String value) {
emitU1(JOpcode.LDC_W, pool.addString(value));
}
public void emitLDC2_W(long value) {
emitU2(JOpcode.LDC2_W, pool.addLong(value));
}
public void emitLDC2_W(double value) {
emitU2(JOpcode.LDC2_W, pool.addDouble(value));
}
// Loading variables.
public void emitILOAD(int index) { emitU1(JOpcode.ILOAD, index); }
public void emitLLOAD(int index) { emitU1(JOpcode.LLOAD, index); }
public void emitFLOAD(int index) { emitU1(JOpcode.FLOAD, index); }
public void emitDLOAD(int index) { emitU1(JOpcode.DLOAD, index); }
public void emitALOAD(int index) { emitU1(JOpcode.ALOAD, index); }
public void emitILOAD_0() { emit(JOpcode.ILOAD_0); }
public void emitILOAD_1() { emit(JOpcode.ILOAD_1); }
public void emitILOAD_2() { emit(JOpcode.ILOAD_2); }
public void emitILOAD_3() { emit(JOpcode.ILOAD_3); }
public void emitLLOAD_0() { emit(JOpcode.LLOAD_0); }
public void emitLLOAD_1() { emit(JOpcode.LLOAD_1); }
public void emitLLOAD_2() { emit(JOpcode.LLOAD_2); }
public void emitLLOAD_3() { emit(JOpcode.LLOAD_3); }
public void emitFLOAD_0() { emit(JOpcode.FLOAD_0); }
public void emitFLOAD_1() { emit(JOpcode.FLOAD_1); }
public void emitFLOAD_2() { emit(JOpcode.FLOAD_2); }
public void emitFLOAD_3() { emit(JOpcode.FLOAD_3); }
public void emitDLOAD_0() { emit(JOpcode.DLOAD_0); }
public void emitDLOAD_1() { emit(JOpcode.DLOAD_1); }
public void emitDLOAD_2() { emit(JOpcode.DLOAD_2); }
public void emitDLOAD_3() { emit(JOpcode.DLOAD_3); }
public void emitALOAD_0() { emit(JOpcode.ALOAD_0); }
public void emitALOAD_1() { emit(JOpcode.ALOAD_1); }
public void emitALOAD_2() { emit(JOpcode.ALOAD_2); }
public void emitALOAD_3() { emit(JOpcode.ALOAD_3); }
public void emitIALOAD() { emit(JOpcode.IALOAD); }
public void emitLALOAD() { emit(JOpcode.LALOAD); }
public void emitFALOAD() { emit(JOpcode.FALOAD); }
public void emitDALOAD() { emit(JOpcode.DALOAD); }
public void emitAALOAD() { emit(JOpcode.AALOAD); }
public void emitBALOAD() { emit(JOpcode.BALOAD); }
public void emitCALOAD() { emit(JOpcode.CALOAD); }
public void emitSALOAD() { emit(JOpcode.SALOAD); }
// Storing variables.
public void emitISTORE(int index) { emitU1(JOpcode.ISTORE, index); }
public void emitLSTORE(int index) { emitU1(JOpcode.LSTORE, index); }
public void emitFSTORE(int index) { emitU1(JOpcode.FSTORE, index); }
public void emitDSTORE(int index) { emitU1(JOpcode.DSTORE, index); }
public void emitASTORE(int index) { emitU1(JOpcode.ASTORE, index); }
public void emitISTORE_0() { emit(JOpcode.ISTORE_0); }
public void emitISTORE_1() { emit(JOpcode.ISTORE_1); }
public void emitISTORE_2() { emit(JOpcode.ISTORE_2); }
public void emitISTORE_3() { emit(JOpcode.ISTORE_3); }
public void emitLSTORE_0() { emit(JOpcode.LSTORE_0); }
public void emitLSTORE_1() { emit(JOpcode.LSTORE_1); }
public void emitLSTORE_2() { emit(JOpcode.LSTORE_2); }
public void emitLSTORE_3() { emit(JOpcode.LSTORE_3); }
public void emitFSTORE_0() { emit(JOpcode.FSTORE_0); }
public void emitFSTORE_1() { emit(JOpcode.FSTORE_1); }
public void emitFSTORE_2() { emit(JOpcode.FSTORE_2); }
public void emitFSTORE_3() { emit(JOpcode.FSTORE_3); }
public void emitDSTORE_0() { emit(JOpcode.DSTORE_0); }
public void emitDSTORE_1() { emit(JOpcode.DSTORE_1); }
public void emitDSTORE_2() { emit(JOpcode.DSTORE_2); }
public void emitDSTORE_3() { emit(JOpcode.DSTORE_3); }
public void emitASTORE_0() { emit(JOpcode.ASTORE_0); }
public void emitASTORE_1() { emit(JOpcode.ASTORE_1); }
public void emitASTORE_2() { emit(JOpcode.ASTORE_2); }
public void emitASTORE_3() { emit(JOpcode.ASTORE_3); }
public void emitIASTORE() { emit(JOpcode.IASTORE); }
public void emitLASTORE() { emit(JOpcode.LASTORE); }
public void emitFASTORE() { emit(JOpcode.FASTORE); }
public void emitDASTORE() { emit(JOpcode.DASTORE); }
public void emitAASTORE() { emit(JOpcode.AASTORE); }
public void emitBASTORE() { emit(JOpcode.BASTORE); }
public void emitCASTORE() { emit(JOpcode.CASTORE); }
public void emitSASTORE() { emit(JOpcode.SASTORE); }
// Stack manipulation.
public void emitPOP() { emit(JOpcode.POP); }
public void emitPOP2() { emit(JOpcode.POP2); }
public void emitDUP() { emit(JOpcode.DUP); }
public void emitDUP_X1() { emit(JOpcode.DUP_X1); }
public void emitDUP_X2() { emit(JOpcode.DUP_X2); }
public void emitDUP2() { emit(JOpcode.DUP2); }
public void emitDUP2_X1() { emit(JOpcode.DUP2_X1); }
public void emitDUP2_X2() { emit(JOpcode.DUP2_X2); }
public void emitSWAP() { emit(JOpcode.SWAP); }
// Artithmetic and logic operations.
public void emitIADD() { emit(JOpcode.IADD); }
public void emitLADD() { emit(JOpcode.LADD); }
public void emitFADD() { emit(JOpcode.FADD); }
public void emitDADD() { emit(JOpcode.DADD); }
public void emitISUB() { emit(JOpcode.ISUB); }
public void emitLSUB() { emit(JOpcode.LSUB); }
public void emitFSUB() { emit(JOpcode.FSUB); }
public void emitDSUB() { emit(JOpcode.DSUB); }
public void emitIMUL() { emit(JOpcode.IMUL); }
public void emitLMUL() { emit(JOpcode.LMUL); }
public void emitFMUL() { emit(JOpcode.FMUL); }
public void emitDMUL() { emit(JOpcode.DMUL); }
public void emitIDIV() { emit(JOpcode.IDIV); }
public void emitLDIV() { emit(JOpcode.LDIV); }
public void emitFDIV() { emit(JOpcode.FDIV); }
public void emitDDIV() { emit(JOpcode.DDIV); }
public void emitIREM() { emit(JOpcode.IREM); }
public void emitLREM() { emit(JOpcode.LREM); }
public void emitFREM() { emit(JOpcode.FREM); }
public void emitDREM() { emit(JOpcode.DREM); }
public void emitINEG() { emit(JOpcode.INEG); }
public void emitLNEG() { emit(JOpcode.LNEG); }
public void emitFNEG() { emit(JOpcode.FNEG); }
public void emitDNEG() { emit(JOpcode.DNEG); }
public void emitISHL() { emit(JOpcode.ISHL); }
public void emitLSHL() { emit(JOpcode.LSHL); }
public void emitISHR() { emit(JOpcode.ISHR); }
public void emitLSHR() { emit(JOpcode.LSHR); }
public void emitIUSHR() { emit(JOpcode.IUSHR); }
public void emitLUSHR() { emit(JOpcode.LUSHR); }
public void emitIAND() { emit(JOpcode.IAND); }
public void emitLAND() { emit(JOpcode.LAND); }
public void emitIOR() { emit(JOpcode.IOR); }
public void emitLOR() { emit(JOpcode.LOR); }
public void emitIXOR() { emit(JOpcode.IXOR); }
public void emitLXOR() { emit(JOpcode.LXOR); }
public void emitIINC(int index, int increment) {
emitU1U1(JOpcode.IINC, index, increment);
}
// (Numeric) type conversions.
public void emitI2L() { emit(JOpcode.I2L); }
public void emitI2F() { emit(JOpcode.I2F); }
public void emitI2D() { emit(JOpcode.I2D); }
public void emitL2I() { emit(JOpcode.L2I); }
public void emitL2F() { emit(JOpcode.L2F); }
public void emitL2D() { emit(JOpcode.L2D); }
public void emitF2I() { emit(JOpcode.F2I); }
public void emitF2L() { emit(JOpcode.F2L); }
public void emitF2D() { emit(JOpcode.F2D); }
public void emitD2I() { emit(JOpcode.D2I); }
public void emitD2L() { emit(JOpcode.D2L); }
public void emitD2F() { emit(JOpcode.D2F); }
public void emitI2B() { emit(JOpcode.I2B); }
public void emitI2C() { emit(JOpcode.I2C); }
public void emitI2S() { emit(JOpcode.I2S); }
// Comparisons and tests.
public void emitLCMP() { emit(JOpcode.LCMP); }
public void emitFCMPL() { emit(JOpcode.FCMPL); }
public void emitFCMPG() { emit(JOpcode.FCMPG); }
public void emitDCMPL() { emit(JOpcode.DCMPL); }
public void emitDCMPG() { emit(JOpcode.DCMPG); }
protected void emitGenericIF(JOpcode opcode, Label label)
throws OffsetTooBigException {
emitU2(opcode, label.getOffset16(getPC() + 1, getPC()));
}
public void emitIFEQ(Label label) throws OffsetTooBigException {
emitGenericIF(JOpcode.IFEQ, label);
}
public void emitIFEQ(int targetPC) throws OffsetTooBigException {
emitU2(JOpcode.IFEQ, targetPC - getPC());
}
public void emitIFEQ() {
emitU2(JOpcode.IFEQ, 0);
}
public void emitIFNE(Label label) throws OffsetTooBigException {
emitGenericIF(JOpcode.IFNE, label);
}
public void emitIFNE(int targetPC) throws OffsetTooBigException {
emitU2(JOpcode.IFNE, targetPC - getPC());
}
public void emitIFNE() {
emitU2(JOpcode.IFNE, 0);
}
public void emitIFLT(Label label) throws OffsetTooBigException {
emitGenericIF(JOpcode.IFLT, label);
}
public void emitIFLT(int targetPC) throws OffsetTooBigException {
emitU2(JOpcode.IFLT, targetPC - getPC());
}
public void emitIFLT() {
emitU2(JOpcode.IFLT, 0);
}
public void emitIFGE(Label label) throws OffsetTooBigException {
emitGenericIF(JOpcode.IFGE, label);
}
public void emitIFGE(int targetPC) throws OffsetTooBigException {
emitU2(JOpcode.IFGE, targetPC - getPC());
}
public void emitIFGE() {
emitU2(JOpcode.IFGE, 0);
}
public void emitIFGT(Label label) throws OffsetTooBigException {
emitGenericIF(JOpcode.IFGT, label);
}
public void emitIFGT(int targetPC) throws OffsetTooBigException {
emitU2(JOpcode.IFGT, targetPC - getPC());
}
public void emitIFGT() {
emitU2(JOpcode.IFGT, 0);
}
public void emitIFLE(Label label) throws OffsetTooBigException {
emitGenericIF(JOpcode.IFLE, label);
}
public void emitIFLE(int targetPC) throws OffsetTooBigException {
emitU2(JOpcode.IFLE, targetPC - getPC());
}
public void emitIFLE() {
emitU2(JOpcode.IFLE, 0);
}
public void emitIF_ICMPEQ(Label label) throws OffsetTooBigException {
emitGenericIF(JOpcode.IF_ICMPEQ, label);
}
public void emitIF_ICMPEQ(int targetPC) throws OffsetTooBigException {
emitU2(JOpcode.IF_ICMPEQ, targetPC - getPC());
}
public void emitIF_ICMPEQ() {
emitU2(JOpcode.IF_ICMPEQ, 0);
}
public void emitIF_ICMPNE(Label label) throws OffsetTooBigException {
emitGenericIF(JOpcode.IF_ICMPNE, label);
}
public void emitIF_ICMPNE(int targetPC) throws OffsetTooBigException {
emitU2(JOpcode.IF_ICMPNE, targetPC - getPC());
}
public void emitIF_ICMPNE() {
emitU2(JOpcode.IF_ICMPNE, 0);
}
public void emitIF_ICMPLT(Label label) throws OffsetTooBigException {
emitGenericIF(JOpcode.IF_ICMPLT, label);
}
public void emitIF_ICMPLT(int targetPC) throws OffsetTooBigException {
emitU2(JOpcode.IF_ICMPLT, targetPC - getPC());
}
public void emitIF_ICMPLT() {
emitU2(JOpcode.IF_ICMPLT, 0);
}
public void emitIF_ICMPGE(Label label) throws OffsetTooBigException {
emitGenericIF(JOpcode.IF_ICMPGE, label);
}
public void emitIF_ICMPGE(int targetPC) throws OffsetTooBigException {
emitU2(JOpcode.IF_ICMPGE, targetPC - getPC());
}
public void emitIF_ICMPGE() {
emitU2(JOpcode.IF_ICMPGE, 0);
}
public void emitIF_ICMPGT(Label label) throws OffsetTooBigException {
emitGenericIF(JOpcode.IF_ICMPGT, label);
}
public void emitIF_ICMPGT(int targetPC) throws OffsetTooBigException {
emitU2(JOpcode.IF_ICMPGT, targetPC - getPC());
}
public void emitIF_ICMPGT() {
emitU2(JOpcode.IF_ICMPGT, 0);
}
public void emitIF_ICMPLE(Label label) throws OffsetTooBigException {
emitGenericIF(JOpcode.IF_ICMPLE, label);
}
public void emitIF_ICMPLE(int targetPC) throws OffsetTooBigException {
emitU2(JOpcode.IF_ICMPLE, targetPC - getPC());
}
public void emitIF_ICMPLE() {
emitU2(JOpcode.IF_ICMPLE, 0);
}
public void emitIF_ACMPEQ(Label label) throws OffsetTooBigException {
emitGenericIF(JOpcode.IF_ACMPEQ, label);
}
public void emitIF_ACMPEQ(int targetPC) throws OffsetTooBigException {
emitU2(JOpcode.IF_ACMPEQ, targetPC - getPC());
}
public void emitIF_ACMPEQ() {
emitU2(JOpcode.IF_ACMPEQ, 0);
}
public void emitIF_ACMPNE(Label label) throws OffsetTooBigException {
emitGenericIF(JOpcode.IF_ACMPNE, label);
}
public void emitIF_ACMPNE(int targetPC) throws OffsetTooBigException {
emitU2(JOpcode.IF_ACMPNE, targetPC - getPC());
}
public void emitIF_ACMPNE() {
emitU2(JOpcode.IF_ACMPNE, 0);
}
public void emitIFNULL(Label label) throws OffsetTooBigException {
emitGenericIF(JOpcode.IFNULL, label);
}
public void emitIFNULL(int targetPC) throws OffsetTooBigException {
emitU2(JOpcode.IFNULL, targetPC - getPC());
}
public void emitIFNULL() {
emitU2(JOpcode.IFNULL, 0);
}
public void emitIFNONNULL(Label label) throws OffsetTooBigException {
emitGenericIF(JOpcode.IFNONNULL, label);
}
public void emitIFNONNULL(int targetPC) throws OffsetTooBigException {
emitU2(JOpcode.IFNONNULL, targetPC - getPC());
}
public void emitIFNONNULL() {
emitU2(JOpcode.IFNONNULL, 0);
}
public void emitGOTO(Label label) throws OffsetTooBigException {
emitU2(JOpcode.GOTO, label.getOffset16(getPC() + 1, getPC()));
}
public void emitGOTO(int targetPC) throws OffsetTooBigException {
int offset = targetPC - getPC();
checkOffset16(offset);
emitU2(JOpcode.GOTO, offset);
}
public void emitGOTO() {
emitU2(JOpcode.GOTO, 0);
}
public void emitGOTO_W(Label label) {
emitU4(JOpcode.GOTO_W, label.getOffset32(getPC() + 1, getPC()));
}
public void emitGOTO_W(int targetPC) {
emitU4(JOpcode.GOTO_W, targetPC - getPC());
}
public void emitGOTO_W() {
emitU4(JOpcode.GOTO_W, 0);
}
public void emitJSR(Label label) throws OffsetTooBigException {
emitU2(JOpcode.JSR, label.getOffset16(getPC() + 1, getPC()));
}
public void emitJSR(int targetPC) {
emitU2(JOpcode.JSR, targetPC - getPC());
}
public void emitJSR() {
emitU2(JOpcode.JSR, 0);
}
public void emitJSR_W(Label label) {
emitU4(JOpcode.JSR_W, label.getOffset32(getPC() + 1, getPC()));
}
public void emitJSR_W(int targetPC) {
emitU4(JOpcode.JSR_W, targetPC - getPC());
}
public void emitJSR_W() {
emitU4(JOpcode.JSR_W, 0);
}
/*
public void emitRET(Label label) throws OffsetTooBigException {
emitU2(JOpcode.RET, label.getOffset16(getPC() + 1, getPC()));
}
public void emitRET(int targetPC) {
emitU1(JOpcode.RET, targetPC);
}
public void emitRET() {
emitU1(JOpcode.RET, 0);
}
*/
public void emitRET(int index) {
emitU1(JOpcode.RET, index);
}
public void emitRET(JLocalVariable var) {
emitRET(var.getIndex());
}
public void emitTABLESWITCH(int[] keys,
Label[] branches,
Label defaultBranch) {
assert keys.length == branches.length;
int low = keys[0], high = keys[keys.length - 1];
int instrPC = getPC();
setStackProduction(instrPC, JOpcode.TABLESWITCH);
codeArray.addU1(JOpcode.cTABLESWITCH);
while (getPC() % 4 != 0) codeArray.addU1(0);
codeArray.addU4(defaultBranch.getOffset32(getPC(), instrPC));
codeArray.addU4(low);
codeArray.addU4(high);
for (int i = 0; i < branches.length; i++) {
assert keys[i] == low + i;
codeArray.addU4(branches[i].getOffset32(getPC(), instrPC));
}
}
public void emitLOOKUPSWITCH(int[] keys,
Label[] branches,
Label defaultBranch) {
assert keys.length == branches.length;
int instrPC = getPC();
setStackProduction(getPC(), JOpcode.LOOKUPSWITCH);
codeArray.addU1(JOpcode.cLOOKUPSWITCH);
while (getPC() % 4 != 0) codeArray.addU1(0);
codeArray.addU4(defaultBranch.getOffset32(getPC(), instrPC));
codeArray.addU4(branches.length);
for (int i = 0; i < branches.length; i++) {
codeArray.addU4(keys[i]);
codeArray.addU4(branches[i].getOffset32(getPC(), instrPC));
}
}
public void emitIRETURN() { emit(JOpcode.IRETURN); }
public void emitLRETURN() { emit(JOpcode.LRETURN); }
public void emitFRETURN() { emit(JOpcode.FRETURN); }
public void emitDRETURN() { emit(JOpcode.DRETURN); }
public void emitARETURN() { emit(JOpcode.ARETURN); }
public void emitRETURN() { emit(JOpcode.RETURN); }
// Field access
public void emitGETSTATIC(String className, String name, JType type) {
setStackProduction(getPC(), type.getSize());
int index = pool.addFieldRef(className, name, type.getSignature());
emitU2(JOpcode.GETSTATIC, index);
}
public void emitPUTSTATIC(String className, String name, JType type) {
setStackProduction(getPC(), -type.getSize());
int index = pool.addFieldRef(className, name, type.getSignature());
emitU2(JOpcode.PUTSTATIC, index);
}
public void emitGETFIELD(String className, String name, JType type) {
setStackProduction(getPC(), type.getSize() - 1);
int index = pool.addFieldRef(className, name, type.getSignature());
emitU2(JOpcode.GETFIELD, index);
}
public void emitPUTFIELD(String className, String name, JType type) {
setStackProduction(getPC(), -(type.getSize() + 1));
int index = pool.addFieldRef(className, name, type.getSignature());
emitU2(JOpcode.PUTFIELD, index);
}
// Method invocation
public void emitINVOKEVIRTUAL(String className,
String name,
JMethodType type) {
setStackProduction(getPC(), type.getProducedStack() - 1);
int index =
pool.addClassMethodRef(className, name, type.getSignature());
emitU2(JOpcode.INVOKEVIRTUAL, index);
}
public void emitINVOKESPECIAL(String className,
String name,
JMethodType type) {
setStackProduction(getPC(), type.getProducedStack() - 1);
int index =
pool.addClassMethodRef(className, name, type.getSignature());
emitU2(JOpcode.INVOKESPECIAL, index);
}
public void emitINVOKESTATIC(String className,
String name,
JMethodType type) {
setStackProduction(getPC(), type.getProducedStack());
int index =
pool.addClassMethodRef(className, name, type.getSignature());
emitU2(JOpcode.INVOKESTATIC, index);
}
public void emitINVOKEINTERFACE(String className,
String name,
JMethodType type) {
setStackProduction(getPC(), type.getProducedStack() - 1);
int index =
pool.addInterfaceMethodRef(className, name, type.getSignature());
emitU2U1U1(JOpcode.INVOKEINTERFACE, index, type.getArgsSize() + 1, 0);
}
// Object creation
public void emitNEW(String className) {
emitU2(JOpcode.NEW, pool.addClass(className));
}
public void emitNEWARRAY(JType elemType) {
emitU1(JOpcode.NEWARRAY, elemType.getTag());
}
public void emitANEWARRAY(JReferenceType elemType) {
emitU2(JOpcode.ANEWARRAY, pool.addDescriptor(elemType));
}
public void emitMULTIANEWARRAY(JReferenceType elemType, int dimensions) {
setStackProduction(getPC(), -dimensions + 1);
emitU2U1(JOpcode.MULTIANEWARRAY,
pool.addDescriptor(elemType),
dimensions);
}
public void emitARRAYLENGTH() { emit(JOpcode.ARRAYLENGTH); }
// Exception throwing
public void emitATHROW() { emit(JOpcode.ATHROW); }
// Dynamic typing
public void emitCHECKCAST(JReferenceType type) {
emitU2(JOpcode.CHECKCAST, pool.addDescriptor(type));
}
public void emitINSTANCEOF(JReferenceType type) {
emitU2(JOpcode.INSTANCEOF, pool.addDescriptor(type));
}
// Monitors
public void emitMONITORENTER() { emit(JOpcode.MONITORENTER); }
public void emitMONITOREXIT() { emit(JOpcode.MONITOREXIT); }
// Wide variants
// FIXME setStackProd. will here raise an exception
public void emitWIDE(JOpcode opcode, int index) {
assert (opcode.code == JOpcode.cILOAD)
|| (opcode.code == JOpcode.cLLOAD)
|| (opcode.code == JOpcode.cFLOAD)
|| (opcode.code == JOpcode.cDLOAD)
|| (opcode.code == JOpcode.cALOAD)
|| (opcode.code == JOpcode.cISTORE)
|| (opcode.code == JOpcode.cLSTORE)
|| (opcode.code == JOpcode.cFSTORE)
|| (opcode.code == JOpcode.cDSTORE)
|| (opcode.code == JOpcode.cASTORE)
|| (opcode.code == JOpcode.cRET)
: "invalide opcode for WIDE: " + opcode;
setStackProduction(getPC(), opcode);
codeArray.addU1(JOpcode.WIDE.code);
codeArray.addU1(opcode.code);
codeArray.addU2(index);
}
public void emitWIDE(JOpcode opcode, int index, int constant) {
assert opcode.code == JOpcode.cIINC
: "invalid opcode for WIDE: " + opcode;
setStackProduction(getPC(), opcode);
codeArray.addU1(JOpcode.cWIDE);
codeArray.addU1(opcode.code);
codeArray.addU2(index);
codeArray.addU2(constant);
}
protected void emitU1(JOpcode opcode, int i1) {
setStackProduction(getPC(), opcode);
codeArray.addU1(opcode.code);
codeArray.addU1(i1);
}
protected void emitU1U1(JOpcode opcode, int i1, int i2) {
setStackProduction(getPC(), opcode);
codeArray.addU1(opcode.code);
codeArray.addU1(i1);
codeArray.addU1(i2);
}
protected void emitU2(JOpcode opcode, int i1) {
setStackProduction(getPC(), opcode);
codeArray.addU1(opcode.code);
codeArray.addU2(i1);
}
protected void emitU2U1(JOpcode opcode, int i1, int i2) {
setStackProduction(getPC(), opcode);
codeArray.addU1(opcode.code);
codeArray.addU2(i1);
codeArray.addU1(i2);
}
protected void emitU2U1U1(JOpcode opcode, int i1, int i2, int i3) {
setStackProduction(getPC(), opcode);
codeArray.addU1(opcode.code);
codeArray.addU2(i1);
codeArray.addU1(i2);
codeArray.addU1(i3);
}
protected void emitU4(JOpcode opcode, int i1) {
setStackProduction(getPC(), opcode);
codeArray.addU1(opcode.code);
codeArray.addU4(i1);
}
protected int getU1(int sourcePos) {
return codeArray.getU1(sourcePos);
}
protected int getU2(int sourcePos) {
return codeArray.getU2(sourcePos);
}
protected int getU4(int sourcePos) {
return codeArray.getU4(sourcePos);
}
protected int getS1(int sourcePos) {
return codeArray.getS1(sourcePos);
}
protected int getS2(int sourcePos) {
return codeArray.getS2(sourcePos);
}
protected int getS4(int sourcePos) {
return codeArray.getS4(sourcePos);
}
// Stack size computation
//////////////////////////////////////////////////////////////////////
protected int getStackProduction(int pc) {
if (stackProduction == null || pc >= stackProduction.length)
return UNKNOWN_STACK_SIZE;
else
return stackProduction[pc];
}
protected void setStackProduction(int pc, int production) {
if (stackProduction == null) {
stackProduction = new int[256];
Arrays.fill(stackProduction, UNKNOWN_STACK_SIZE);
} else {
while (pc >= stackProduction.length) {
int[] newStackProduction = new int[stackProduction.length * 2];
System.arraycopy(stackProduction, 0,
newStackProduction, 0,
stackProduction.length);
Arrays.fill(newStackProduction,
stackProduction.length,
newStackProduction.length,
UNKNOWN_STACK_SIZE);
stackProduction = newStackProduction;
}
}
stackProduction[pc] = production;
}
protected void setStackProduction(int pc, JOpcode opcode) {
// TODO we should instead check whether the opcode has known
// stack consumption/production.
if (getStackProduction(pc) == UNKNOWN_STACK_SIZE)
// && opcode.hasKnownProducedDataSize()
// && opcode.hasKnownConsumedDataSize())
setStackProduction(pc,
opcode.getProducedDataSize()
- opcode.getConsumedDataSize());
}
protected int computeMaxStackSize() {
if (stackSizes == null) {
stackSizes = new int[getSize()];
Arrays.fill(stackSizes, UNKNOWN_STACK_SIZE);
stackSizes[0] = 0;
}
int size = computeMaxStackSize(0, 0, 0);
// compute stack sizes for exception handlers too
ExceptionHandler exh = null;
for (Iterator it = exceptionHandlers.iterator();
it.hasNext();) {
exh = (ExceptionHandler)it.next();
int exhSize = computeMaxStackSize(exh.getHandlerPC(), 1, 1);
if (size < exhSize)
size = exhSize;
}
return size;
}
protected int computeMaxStackSize(int pc, int stackSize, int maxStackSize) {
JCodeIterator iterator = new JCodeIterator(this, pc);
for (;;) {
int successors = iterator.getSuccessorCount();
if (successors == 0)
return maxStackSize;
else {
assert stackProduction[iterator.getPC()] != UNKNOWN_STACK_SIZE
: "unknown stack production, pc=" + iterator.getPC()
+ " in method " + owner.getName();
stackSize += stackProduction[iterator.getPC()];
if (stackSize > maxStackSize)
maxStackSize = stackSize;
int nextPC = -1;
for (int i = 0; i < successors; ++i) {
int succPC = iterator.getSuccessorPC(i);
assert succPC >= 0 && succPC < stackSizes.length
: iterator.getPC() + ": invalid pc: " + succPC
+ " op: " + iterator.getOpcode();
if (stackSizes[succPC] == UNKNOWN_STACK_SIZE) {
stackSizes[succPC] = stackSize;
if (nextPC == -1)
nextPC = succPC;
else
maxStackSize = computeMaxStackSize(succPC,
stackSize,
maxStackSize);
}
}
if (nextPC == -1)
return maxStackSize;
else
iterator.moveTo(nextPC);
}
}
}
// Labels
//////////////////////////////////////////////////////////////////////
public static class OffsetTooBigException extends Exception {
public OffsetTooBigException() { super(); }
public OffsetTooBigException(String message) { super(message); }
}
protected void checkOffset16(int offset) throws OffsetTooBigException {
if (offset < Short.MIN_VALUE || offset > Short.MAX_VALUE)
throw new OffsetTooBigException("offset too big to fit"
+ " in 16 bits: " + offset);
}
public class Label {
protected boolean anchored = false;
protected int targetPC = 0;
public void anchorToNext() {
assert !anchored;
this.targetPC = getPC();
anchored = true;
}
public int getAnchor() {
assert anchored;
return targetPC;
}
protected int getOffset16(int pc, int instrPC)
throws OffsetTooBigException {
if (anchored) {
int offset = targetPC - instrPC;
checkOffset16(offset);
return offset;
} else {
recordOffsetToPatch(pc, 16, instrPC, this);
return 0;
}
}
protected int getOffset32(int pc, int instrPC) {
if (anchored)
return targetPC - instrPC;
else {
recordOffsetToPatch(pc, 32, instrPC, this);
return 0;
}
}
}
public Label newLabel() {
return new Label();
}
public Label[] newLabels(int count) {
Label[] labels = new Label[count];
for (int i = 0; i < labels.length; ++i)
labels[i] = newLabel();
return labels;
}
protected static class OffsetToPatch {
public final int pc;
public final int size;
public final int instrPC;
public final Label label;
public OffsetToPatch(int pc, int size, int instrPC, Label label) {
this.pc = pc;
this.size = size;
this.instrPC = instrPC;
this.label = label;
}
}
protected void recordOffsetToPatch(int offsetPC,
int size,
int instrPC,
Label label) {
offsetToPatch.add(new OffsetToPatch(offsetPC, size, instrPC, label));
}
protected void patchAllOffset() throws OffsetTooBigException {
Iterator offsetIt = offsetToPatch.iterator();
while (offsetIt.hasNext()) {
OffsetToPatch offset = (OffsetToPatch)offsetIt.next();
int offsetValue = offset.label.getAnchor() - offset.instrPC;
if (offset.size == 16) {
checkOffset16(offsetValue);
codeArray.putU2(offset.pc, offsetValue);
} else
codeArray.putU4(offset.pc, offsetValue);
}
}
// Exception handling
//////////////////////////////////////////////////////////////////////
public class ExceptionHandler {
protected int startPC, endPC, handlerPC;
protected final String catchType;
protected final int catchTypeIndex;
public void setStartPC(int pc) {
this.startPC = pc;
}
public int getStartPC() {
return this.startPC;
}
public void setEndPC(int pc) {
this.endPC = pc;
}
public int getEndPC() {
return this.endPC;
}
public void setHandlerPC(int pc) {
this.handlerPC = pc;
}
public int getHandlerPC() {
return this.handlerPC;
}
public ExceptionHandler(String catchType) {
this(0, 0, 0, catchType);
}
public ExceptionHandler(int startPC,
int endPC,
int handlerPC,
String catchType) {
this.startPC = startPC;
this.endPC = endPC;
this.handlerPC = handlerPC;
this.catchType = catchType;
this.catchTypeIndex = (catchType == null
? 0
: pool.addClass(catchType));
}
public ExceptionHandler(DataInputStream stream) throws IOException {
this.startPC = stream.readShort();
this.endPC = stream.readShort();
this.handlerPC = stream.readShort();
this.catchTypeIndex = stream.readShort();
this.catchType = (catchTypeIndex == 0
? null
: pool.lookupClass(catchTypeIndex));
}
public void writeTo(DataOutputStream stream) throws IOException {
stream.writeShort(startPC);
stream.writeShort(endPC);
stream.writeShort(handlerPC);
stream.writeShort(catchTypeIndex);
}
// Follows javap output format for exception handlers.
/*@Override*/public String toString() {
StringBuffer buf = new StringBuffer(" ");
if (startPC < 10) buf.append(" ");
buf.append(startPC);
buf.append(" ");
if (endPC < 10) buf.append(" ");
buf.append(endPC);
buf.append(" ");
buf.append(handlerPC);
buf.append(" ");
if (catchType != null) {
buf.append("Class ");
buf.append(catchType);
}
else
buf.append("any");
return buf.toString();
}
}
public void addExceptionHandler(ExceptionHandler handler) {
assert !frozen;
exceptionHandlers.add(handler);
}
public void addExceptionHandler(int startPC,
int endPC,
int handlerPC,
String catchType) {
addExceptionHandler(new ExceptionHandler(startPC,
endPC,
handlerPC,
catchType));
}
public void addFinallyHandler(int startPC, int endPC, int handlerPC) {
assert !frozen;
addExceptionHandler(startPC, endPC, handlerPC, null);
}
public List/*<ExceptionHandler>*/ getExceptionHandlers() {
return exceptionHandlers;
}
// Line numbers
//////////////////////////////////////////////////////////////////////
protected int[] lineNumbers = null;
protected void ensureLineNumberCapacity(int endPC) {
assert !frozen;
if (lineNumbers == null) {
lineNumbers = new int[endPC];
addAttribute(context.JLineNumberTableAttribute(owner.getOwner(),
this));
} else if (lineNumbers.length < endPC) {
int[] newLN = new int[Math.max(endPC, lineNumbers.length * 2)];
System.arraycopy(lineNumbers, 0, newLN, 0, lineNumbers.length);
lineNumbers = newLN;
}
}
/**
* Set all line numbers in the interval [startPC, endPC) to
* line, overwriting existing line numbers.
*/
public void setLineNumber(int startPC, int endPC, int line) {
ensureLineNumberCapacity(endPC);
Arrays.fill(lineNumbers, startPC, endPC, line);
}
public void setLineNumber(int instrPC, int line) {
setLineNumber(instrPC, instrPC + 1, line);
}
/** Sets all non-filled line numbers in the interval [startPC, endPC)
* to 'line'.
*/
public void completeLineNumber(int startPC, int endPC, int line) {
ensureLineNumberCapacity(endPC);
for (int pc = startPC; pc < endPC; ++pc)
if (lineNumbers[pc] == 0) lineNumbers[pc] = line;
}
public int[] getLineNumbers() {
assert frozen;
if (lineNumbers == null) return new int[0];
else if (lineNumbers.length == getPC()) return lineNumbers;
else {
int[] trimmedLN = new int[getPC()];
System.arraycopy(lineNumbers, 0,
trimmedLN, 0,
Math.min(lineNumbers.length, trimmedLN.length));
return trimmedLN;
}
}
// Output
//////////////////////////////////////////////////////////////////////
public void writeTo(DataOutputStream stream) throws IOException {
assert frozen;
stream.writeInt(getSize());
codeArray.writeTo(stream);
}
// Follows javap output format for opcodes.
/*@Override*/ public String toString() {
StringBuffer buf = new StringBuffer();
JOpcode opcode = null;
int pc = 0, addr = 0;
while (pc < codeArray.getSize()) {
buf.append("\n ");
buf.append(pc);
buf.append(":\t");
opcode = JOpcode.OPCODES[codeArray.getU1(pc)];
buf.append(decode(opcode, pc));
if (opcode.code == JOpcode.cTABLESWITCH ||
opcode.code == JOpcode.cLOOKUPSWITCH) {
addr = ((pc / 4 + 1) + 1) * 4; // U4 aligned data
int low = codeArray.getU4(addr);
int high = codeArray.getU4(addr+4);
pc = addr + (2/*low+high*/ + (high - low + 1)/*targets*/) * 4;
} else
pc += opcode.getSize();
}
if (exceptionHandlers.size() > 0) {
buf.append("\n Exception table:\n from to target type\n");
Iterator it = exceptionHandlers.iterator();
while (it.hasNext()) {
ExceptionHandler exh = (ExceptionHandler)it.next();
buf.append(exh);
buf.append("\n");
}
}
return buf.toString();
}
private String decode(JOpcode opcode, int pc) {
String ownerClassName = owner.getOwner().getName();
int data, data2;
StringBuilder buf = new StringBuilder();
buf.append(opcode.name.toLowerCase());
switch (opcode.code) {
case JOpcode.cALOAD: case JOpcode.cASTORE: case JOpcode.cBIPUSH:
case JOpcode.cDLOAD: case JOpcode.cDSTORE:
case JOpcode.cFLOAD: case JOpcode.cFSTORE:
case JOpcode.cILOAD: case JOpcode.cISTORE:
case JOpcode.cLLOAD: case JOpcode.cLSTORE:
data = codeArray.getU1(pc+1);
buf.append("\t");
buf.append(data);
break;
case JOpcode.cLDC:
data = codeArray.getU1(pc+1);
buf.append("\t#");
buf.append(data);
buf.append("; ");
buf.append(pool.lookupEntry(data).toComment(ownerClassName));
break;
case JOpcode.cNEWARRAY:
data = codeArray.getU1(pc+1);
buf.append(" ");
buf.append(JType.tagToString(data));
break;
case JOpcode.cIINC:
data = codeArray.getU1(pc+1);
data2 = codeArray.getU1(pc+2);
buf.append("\t");
buf.append(data);
buf.append(", ");
buf.append(data2);
break;
case JOpcode.cSIPUSH:
data = codeArray.getU2(pc+1);
buf.append("\t");
buf.append(data);
break;
case JOpcode.cANEWARRAY: case JOpcode.cCHECKCAST:
case JOpcode.cGETFIELD: case JOpcode.cGETSTATIC:
case JOpcode.cINSTANCEOF:
case JOpcode.cINVOKESPECIAL: case JOpcode.cINVOKESTATIC:
case JOpcode.cINVOKEVIRTUAL:
case JOpcode.cLDC_W: case JOpcode.cLDC2_W: case JOpcode.cNEW:
case JOpcode.cPUTFIELD: case JOpcode.cPUTSTATIC:
data = codeArray.getU2(pc+1);
buf.append("\t#");
buf.append(data);
buf.append("; ");
buf.append(pool.lookupEntry(data).toComment(ownerClassName));
break;
case JOpcode.cIF_ACMPEQ: case JOpcode.cIF_ACMPNE:
case JOpcode.cIFEQ: case JOpcode.cIFGE: case JOpcode.cIFGT:
case JOpcode.cIFLE: case JOpcode.cIFLT: case JOpcode.cIFNE:
case JOpcode.cIFNONNULL: case JOpcode.cIFNULL:
case JOpcode.cIF_ICMPEQ: case JOpcode.cIF_ICMPGE:
case JOpcode.cIF_ICMPGT: case JOpcode.cIF_ICMPLE:
case JOpcode.cIF_ICMPLT: case JOpcode.cIF_ICMPNE:
data = codeArray.getU2(pc+1); // maybe S2 offset
buf.append("\t");
buf.append(pc+data);
break;
case JOpcode.cGOTO:
data = codeArray.getS2(pc+1); // always S2 offset
buf.append("\t");
buf.append(pc+data);
break;
case JOpcode.cINVOKEINTERFACE:
data = codeArray.getU2(pc+1);
data2 = codeArray.getU1(pc+3);
buf.append("\t#");
buf.append(data);
buf.append(", ");
buf.append(data2);
buf.append("; ");
buf.append(pool.lookupEntry(data).toComment(ownerClassName));
break;
case JOpcode.cTABLESWITCH:
buf.append("{ //");
int addr = ((pc / 4 + 1) + 1) * 4; // U4 aligned data
int low = codeArray.getU4(addr);
int high = codeArray.getU4(addr+4);
buf.append(low);
buf.append(" to ");
buf.append(high);
for (int i = low; i <= high; ++i) {
buf.append("\n\t\t");
buf.append(i);
buf.append(": ");
buf.append(pc+codeArray.getU4(addr+(i-1)*4));
buf.append(";");
}
buf.append("\n\t\tdefault: ");
buf.append(pc+codeArray.getU4(addr-4));
buf.append(" }");
default:
}
return buf.toString();
}
}
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