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package ch.epfl.lamp.fjbg;
/**
* Extended list of instructions, providing pseudo-instructions which
* are easier to use than the standard ones.
*
* @author Michel Schinz, Thomas Friedli
* @version 1.0
*/
public class JExtendedCode extends JCode {
public final static int COND_EQ = 0;
public final static int COND_NE = 1;
public final static int COND_LT = 2;
public final static int COND_GE = 3;
public final static int COND_GT = 4;
public final static int COND_LE = 5;
private final JOpcode[] forbidden = new JOpcode[0];
private final JOpcode[] nothingToDo = new JOpcode[0];
private final JOpcode[][][] typeConversions = {
{
/* T_BOOLEAN -> T_BOOLEAN */ nothingToDo,
/* T_BOOLEAN -> T_CHAR */ forbidden,
/* T_BOOLEAN -> T_FLOAT */ forbidden,
/* T_BOOLEAN -> T_DOUBLE */ forbidden,
/* T_BOOLEAN -> T_BYTE */ forbidden,
/* T_BOOLEAN -> T_SHORT */ forbidden,
/* T_BOOLEAN -> T_INT */ forbidden,
/* T_BOOLEAN -> T_LONG */ forbidden
},
{
/* T_CHAR -> T_BOOLEAN */ forbidden,
/* T_CHAR -> T_CHAR */ nothingToDo,
/* T_CHAR -> T_FLOAT */ {JOpcode.I2F},
/* T_CHAR -> T_DOUBLE */ {JOpcode.I2D},
/* T_CHAR -> T_BYTE */ {JOpcode.I2B},
/* T_CHAR -> T_SHORT */ {JOpcode.I2S},
/* T_CHAR -> T_INT */ nothingToDo,
/* T_CHAR -> T_LONG */ {JOpcode.I2L}
},
{
/* T_FLOAT -> T_BOOLEAN */ forbidden,
/* T_FLOAT -> T_CHAR */ {JOpcode.F2I, JOpcode.I2C},
/* T_FLOAT -> T_FLOAT */ nothingToDo,
/* T_FLOAT -> T_DOUBLE */ {JOpcode.F2D},
/* T_FLOAT -> T_BYTE */ {JOpcode.F2I, JOpcode.I2B},
/* T_FLOAT -> T_SHORT */ {JOpcode.F2I, JOpcode.I2S},
/* T_FLOAT -> T_INT */ {JOpcode.F2I},
/* T_FLOAT -> T_LONG */ {JOpcode.F2L}
},
{
/* T_DOUBLE -> T_BOOLEAN */ forbidden,
/* T_DOUBLE -> T_CHAR */ {JOpcode.D2I, JOpcode.I2C},
/* T_DOUBLE -> T_FLOAT */ {JOpcode.D2F},
/* T_DOUBLE -> T_DOUBLE */ nothingToDo,
/* T_DOUBLE -> T_BYTE */ {JOpcode.D2I, JOpcode.I2B},
/* T_DOUBLE -> T_SHORT */ {JOpcode.D2I, JOpcode.I2S},
/* T_DOUBLE -> T_INT */ {JOpcode.D2I},
/* T_DOUBLE -> T_LONG */ {JOpcode.D2L}
},
{
/* T_BYTE -> T_BOOLEAN */ forbidden,
/* T_BYTE -> T_CHAR */ {JOpcode.I2C},
/* T_BYTE -> T_FLOAT */ {JOpcode.I2F},
/* T_BYTE -> T_DOUBLE */ {JOpcode.I2D},
/* T_BYTE -> T_BYTE */ nothingToDo,
/* T_BYTE -> T_SHORT */ nothingToDo,
/* T_BYTE -> T_INT */ nothingToDo,
/* T_BYTE -> T_LONG */ {JOpcode.I2L}
},
{
/* T_SHORT -> T_BOOLEAN */ forbidden,
/* T_SHORT -> T_CHAR */ {JOpcode.I2C},
/* T_SHORT -> T_FLOAT */ {JOpcode.I2F},
/* T_SHORT -> T_DOUBLE */ {JOpcode.I2D},
/* T_SHORT -> T_BYTE */ {JOpcode.I2B},
/* T_SHORT -> T_SHORT */ nothingToDo,
/* T_SHORT -> T_INT */ nothingToDo,
/* T_SHORT -> T_LONG */ {JOpcode.I2L}
},
{
/* T_INT -> T_BOOLEAN */ forbidden,
/* T_INT -> T_CHAR */ {JOpcode.I2C},
/* T_INT -> T_FLOAT */ {JOpcode.I2F},
/* T_INT -> T_DOUBLE */ {JOpcode.I2D},
/* T_INT -> T_BYTE */ {JOpcode.I2B},
/* T_INT -> T_SHORT */ {JOpcode.I2S},
/* T_INT -> T_INT */ nothingToDo,
/* T_INT -> T_LONG */ {JOpcode.I2L}
},
{
/* T_LONG -> T_BOOLEAN */ forbidden,
/* T_LONG -> T_CHAR */ {JOpcode.L2I, JOpcode.I2C},
/* T_LONG -> T_FLOAT */ {JOpcode.L2F},
/* T_LONG -> T_DOUBLE */ {JOpcode.L2D},
/* T_LONG -> T_BYTE */ {JOpcode.L2I, JOpcode.I2B},
/* T_LONG -> T_SHORT */ {JOpcode.L2I, JOpcode.I2S},
/* T_LONG -> T_INT */ {JOpcode.L2I},
/* T_LONG -> T_LONG */ nothingToDo
}
};
public JExtendedCode(FJBGContext context,
JClass clazz,
JMethod owner) {
super(context, clazz, owner);
}
public void emitPUSH(boolean value) { emitPUSH(value ? 1 : 0); }
public void emitPUSH(Boolean value) { emitPUSH(value.booleanValue()); }
public void emitPUSH(byte value) {
switch (value) {
case -1: emitICONST_M1(); break;
case 0: emitICONST_0(); break;
case 1: emitICONST_1(); break;
case 2: emitICONST_2(); break;
case 3: emitICONST_3(); break;
case 4: emitICONST_4(); break;
case 5: emitICONST_5(); break;
default:
emitBIPUSH(value);
}
}
public void emitPUSH(Byte value) { emitPUSH(value.byteValue()); }
public void emitPUSH(short value) {
switch (value) {
case -1: emitICONST_M1(); break;
case 0: emitICONST_0(); break;
case 1: emitICONST_1(); break;
case 2: emitICONST_2(); break;
case 3: emitICONST_3(); break;
case 4: emitICONST_4(); break;
case 5: emitICONST_5(); break;
default:
if (value >= Byte.MIN_VALUE && value <= Byte.MAX_VALUE)
emitBIPUSH((byte)value);
else
emitSIPUSH(value);
}
}
public void emitPUSH(Short value) { emitPUSH(value.shortValue()); }
// TODO check that we do the right thing here
public void emitPUSH(char value) { emitPUSH((int)value); }
public void emitPUSH(Character value) { emitPUSH(value.charValue()); }
public void emitPUSH(int value) {
switch (value) {
case -1: emitICONST_M1(); break;
case 0: emitICONST_0(); break;
case 1: emitICONST_1(); break;
case 2: emitICONST_2(); break;
case 3: emitICONST_3(); break;
case 4: emitICONST_4(); break;
case 5: emitICONST_5(); break;
default:
if (value >= Byte.MIN_VALUE && value <= Byte.MAX_VALUE)
emitBIPUSH((byte)value);
else if (value >= Short.MIN_VALUE && value <= Short.MAX_VALUE)
emitSIPUSH((short)value);
else
emitPUSH_index(pool.addInteger(value));
break;
}
}
public void emitPUSH(Integer value) { emitPUSH(value.intValue()); }
public void emitPUSH(long value) {
if (value == 0L)
emitLCONST_0();
else if (value == 1L)
emitLCONST_1();
else
emitLDC2_W(value);
}
public void emitPUSH(Long value) { emitPUSH(value.longValue()); }
private static final Float ZEROF = Float.valueOf(0f);
private static final Float ONEF = Float.valueOf(1f);
private static final Float TWOF = Float.valueOf(2f);
public void emitPUSH(Float value) {
if (ZEROF.equals(value))
emitFCONST_0();
else if (ONEF.equals(value))
emitFCONST_1();
else if (TWOF.equals(value))
emitFCONST_2();
else
emitPUSH_index(pool.addFloat(value.floatValue()));
}
public void emitPUSH(float value) { emitPUSH(Float.valueOf(value)); }
private static final Double ZEROD = Double.valueOf(0d);
private static final Double ONED = Double.valueOf(1d);
public void emitPUSH(Double value) {
if (ZEROD.equals(value))
emitDCONST_0();
else if (ONED.equals(value))
emitDCONST_1();
else
emitLDC2_W(value.doubleValue());
}
public void emitPUSH(double value) { emitPUSH(Double.valueOf(value)); }
public void emitPUSH(String s) {
emitPUSH_index(pool.addString(s));
}
/** Pushes a class literal on the stack */
public void emitPUSH(JReferenceType type) {
assert owner.owner.major >= 49;
emitPUSH_index(pool.addClass(type.getDescriptor()));
}
protected void emitPUSH_index(int index) {
if (index <= 0xFF)
emitU1(JOpcode.LDC, index);
else
emitU2(JOpcode.LDC_W, index);
}
public void emitLOAD(int index, JType type) {
JOpcode opcode;
switch (type.getTag()) {
case JType.T_BOOLEAN: case JType.T_BYTE: case JType.T_CHAR:
case JType.T_SHORT: case JType.T_INT:
switch (index) {
case 0: emitILOAD_0(); return;
case 1: emitILOAD_1(); return;
case 2: emitILOAD_2(); return;
case 3: emitILOAD_3(); return;
default: opcode = JOpcode.ILOAD;
} break;
case JType.T_FLOAT:
switch (index) {
case 0: emitFLOAD_0(); return;
case 1: emitFLOAD_1(); return;
case 2: emitFLOAD_2(); return;
case 3: emitFLOAD_3(); return;
default: opcode = JOpcode.FLOAD;
} break;
case JType.T_LONG:
switch (index) {
case 0: emitLLOAD_0(); return;
case 1: emitLLOAD_1(); return;
case 2: emitLLOAD_2(); return;
case 3: emitLLOAD_3(); return;
default: opcode = JOpcode.LLOAD;
} break;
case JType.T_DOUBLE:
switch (index) {
case 0: emitDLOAD_0(); return;
case 1: emitDLOAD_1(); return;
case 2: emitDLOAD_2(); return;
case 3: emitDLOAD_3(); return;
default: opcode = JOpcode.DLOAD;
} break;
case JType.T_ARRAY: case JType.T_OBJECT:
switch (index) {
case 0: emitALOAD_0(); return;
case 1: emitALOAD_1(); return;
case 2: emitALOAD_2(); return;
case 3: emitALOAD_3(); return;
default: opcode = JOpcode.ALOAD;
} break;
default:
throw new IllegalArgumentException("invalid type for load "+type);
}
if (index > 0xFF)
emitWIDE(opcode, index);
else
emitU1(opcode, index);
}
public void emitLOAD(JLocalVariable var) {
emitLOAD(var.index, var.type);
}
public void emitSTORE(int index, JType type) {
JOpcode opcode;
switch (type.getTag()) {
case JType.T_BOOLEAN: case JType.T_BYTE: case JType.T_CHAR:
case JType.T_SHORT: case JType.T_INT:
switch (index) {
case 0: emitISTORE_0(); return;
case 1: emitISTORE_1(); return;
case 2: emitISTORE_2(); return;
case 3: emitISTORE_3(); return;
default: opcode = JOpcode.ISTORE;
} break;
case JType.T_FLOAT:
switch (index) {
case 0: emitFSTORE_0(); return;
case 1: emitFSTORE_1(); return;
case 2: emitFSTORE_2(); return;
case 3: emitFSTORE_3(); return;
default: opcode = JOpcode.FSTORE;
} break;
case JType.T_LONG:
switch (index) {
case 0: emitLSTORE_0(); return;
case 1: emitLSTORE_1(); return;
case 2: emitLSTORE_2(); return;
case 3: emitLSTORE_3(); return;
default: opcode = JOpcode.LSTORE;
} break;
case JType.T_DOUBLE:
switch (index) {
case 0: emitDSTORE_0(); return;
case 1: emitDSTORE_1(); return;
case 2: emitDSTORE_2(); return;
case 3: emitDSTORE_3(); return;
default: opcode = JOpcode.DSTORE;
} break;
case JType.T_ARRAY: case JType.T_OBJECT: case JType.T_ADDRESS:
switch (index) {
case 0: emitASTORE_0(); return;
case 1: emitASTORE_1(); return;
case 2: emitASTORE_2(); return;
case 3: emitASTORE_3(); return;
default: opcode = JOpcode.ASTORE;
} break;
default:
throw new IllegalArgumentException("invalid type for store "+type);
}
if (index > 0xFF)
emitWIDE(opcode, index);
else
emitU1(opcode, index);
}
public void emitSTORE(JLocalVariable var) {
emitSTORE(var.index, var.type);
}
public void emitALOAD(JType type) {
switch (type.getTag()) {
case JType.T_BOOLEAN:
case JType.T_BYTE:
emitBALOAD();
break;
case JType.T_CHAR:
emitCALOAD();
break;
case JType.T_SHORT:
emitSALOAD();
break;
case JType.T_INT:
emitIALOAD();
break;
case JType.T_FLOAT:
emitFALOAD();
break;
case JType.T_LONG:
emitLALOAD();
break;
case JType.T_DOUBLE:
emitDALOAD();
break;
case JType.T_ARRAY:
case JType.T_OBJECT:
emitAALOAD();
break;
default:
throw new IllegalArgumentException("invalid type for aload " + type);
}
}
public void emitASTORE(JType type) {
switch (type.getTag()) {
case JType.T_BOOLEAN:
case JType.T_BYTE:
emitBASTORE();
break;
case JType.T_CHAR:
emitCASTORE();
break;
case JType.T_SHORT:
emitSASTORE();
break;
case JType.T_INT:
emitIASTORE();
break;
case JType.T_FLOAT:
emitFASTORE();
break;
case JType.T_LONG:
emitLASTORE();
break;
case JType.T_DOUBLE:
emitDASTORE();
break;
case JType.T_ARRAY:
case JType.T_OBJECT:
emitAASTORE();
break;
default:
throw new IllegalArgumentException("invalid type for astore " + type);
}
}
public void emitRETURN(JType type) {
if (type.isValueType()) {
switch (type.getTag()) {
case JType.T_BOOLEAN:
case JType.T_BYTE:
case JType.T_CHAR:
case JType.T_SHORT:
case JType.T_INT:
emitIRETURN();
break;
case JType.T_FLOAT:
emitFRETURN();
break;
case JType.T_LONG:
emitLRETURN();
break;
case JType.T_DOUBLE:
emitDRETURN();
break;
}
} else if (type.isArrayType() || type.isObjectType())
emitARETURN();
else if (type == JType.VOID)
emitRETURN();
else
throw new IllegalArgumentException("invalid type for RETURN " + type);
}
public void emitADD(JType type) {
switch (type.getTag()) {
case JType.T_BOOLEAN: case JType.T_BYTE: case JType.T_CHAR:
case JType.T_SHORT: case JType.T_INT:
emitIADD(); break;
case JType.T_FLOAT:
emitFADD(); break;
case JType.T_LONG:
emitLADD(); break;
case JType.T_DOUBLE:
emitDADD(); break;
}
}
/**
* Emits a basic type conversion instruction choosen according to the
* types given in parameter.
*
* @param fromType The type of the value to be cast into another type.
* @param toType The type the value will be cast into.
*/
public void emitT2T(JType fromType, JType toType) {
assert fromType.getTag() >= JType.T_BOOLEAN
&& fromType.getTag() <= JType.T_LONG
&& toType.getTag() >= JType.T_BOOLEAN
&& toType.getTag() <= JType.T_LONG;
JOpcode[] conv = typeConversions[fromType.getTag() - 4][toType.getTag() - 4];
if (conv == forbidden) {
throw FJBGContext.mkFatal("inconvertible types : " + fromType.toString()
+ " -> " + toType.toString());
} else if (conv != nothingToDo) {
for (int i = 0; i < conv.length; i++) {
emit(conv[i]);
}
}
}
public void emitIF(int cond, Label label) throws OffsetTooBigException {
assert cond >= COND_EQ && cond <= COND_LE;
emitU2(JOpcode.OPCODES[153 + cond], label.getOffset16(getPC() + 1, getPC()));
}
public void emitIF(int cond, int targetPC) throws OffsetTooBigException {
int offset = targetPC - getPC();
emitU2(JOpcode.OPCODES[153 + cond], offset);
}
public void emitIF(int cond) throws OffsetTooBigException {
emitIF(cond, 0);
}
public void emitIF_ICMP(int cond, Label label) throws OffsetTooBigException {
assert cond >= COND_EQ && cond <= COND_LE;
emitU2(JOpcode.OPCODES[159 + cond], label.getOffset16(getPC() + 1, getPC()));
}
public void emitIF_ICMP(int cond, int targetPC) throws OffsetTooBigException {
int offset = targetPC - getPC();
emitU2(JOpcode.OPCODES[159 + cond], offset);
}
public void emitIF_ICMP(int cond) throws OffsetTooBigException {
emitIF_ICMP(cond, 0);
}
public void emitIF_ACMP(int cond, Label label) throws OffsetTooBigException {
assert cond == COND_EQ || cond == COND_NE;
emitU2(JOpcode.OPCODES[165 + cond], label.getOffset16(getPC() + 1, getPC()));
}
public void emitIF_ACMP(int cond, int targetPC) throws OffsetTooBigException {
int offset = targetPC - getPC();
emitU2(JOpcode.OPCODES[165 + cond], offset);
}
public void emitIF_ACMP(int cond) throws OffsetTooBigException {
emitIF_ACMP(cond, 0);
}
public void emitGOTO_maybe_W(Label label, boolean defaultToWide) {
if (label.anchored)
emitGOTO_maybe_W(label.targetPC);
else {
if (defaultToWide)
emitGOTO_W(label);
else {
try {
emitGOTO(label);
} catch (OffsetTooBigException e) {
throw FJBGContext.mkFatal(e);
}
}
}
}
public void emitGOTO_maybe_W(int targetPC) {
int offset = targetPC - (getPC() + 1);
if (offset < Short.MIN_VALUE || offset > Short.MAX_VALUE)
emitGOTO_W(targetPC);
else {
try {
emitGOTO(targetPC);
} catch (OffsetTooBigException e) {
throw FJBGContext.mkFatal(e);
}
}
}
/**
* Emits a switch instruction choosen according to the caracteristics
* of the given list of keys and a default maxRate.
*
* @param keySets The array of all keys that must be compared to the
* value on stack.
* @param branches The labels representing the jump addresses linked
* with the corresponding keys.
* @param defaultBranch The label representing the default branch
* address.
*/
public void emitSWITCH(int[][] keySets,
Label[] branches,
Label defaultBranch,
double minDensity) {
assert keySets.length == branches.length;
int flatSize = 0;
for (int i = 0; i < keySets.length; ++i)
flatSize += keySets[i].length;
int[] flatKeys = new int[flatSize];
Label[] flatBranches = new Label[flatSize];
int flatI = 0;
for (int i = 0; i < keySets.length; ++i) {
Label branch = branches[i];
int[] keys = keySets[i];
for (int j = 0; j < keys.length; ++j) {
flatKeys[flatI] = keys[j];
flatBranches[flatI] = branch;
}
++flatI;
}
assert flatI == flatSize;
emitSWITCH(flatKeys, flatBranches, defaultBranch, minDensity);
}
/**
* Emits a switch instruction choosen according to the caracteristics
* of the given list of keys and a given maxRate.
*
* @param keys The array of all keys that must be compared to the
* value on stack.
* @param branches The labels representing the jump addresses linked
* with the corresponding keys.
* @param defaultBranch The label representing the default branch
* address.
* @param minDensity The minimum density to use for TABLESWITCH.
*/
public void emitSWITCH(int[] keys,
Label[] branches,
Label defaultBranch,
double minDensity) {
assert keys.length == branches.length;
// sorting the tables
// FIXME use quicksort
for (int i = 1; i < keys.length; i++) {
for (int j = 1; j <= keys.length - i; j++) {
if (keys[j] < keys[j - 1]) {
int tmp = keys[j];
keys[j] = keys[j - 1];
keys[j - 1] = tmp;
Label tmp_l = branches[j];
branches[j] = branches[j - 1];
branches[j - 1] = tmp_l;
}
}
}
int keyMin = keys[0], keyMax = keys[keys.length - 1];
/** Calculate in long to guard against overflow. */
long keyRange = (long)keyMax - keyMin + 1;
if ((double)keys.length / (double)keyRange >= minDensity) {
// Keys are dense enough, use a table in which holes are
// filled with defaultBranch.
int[] newKeys = new int[(int)keyRange];
Label[] newBranches = new Label[(int)keyRange];
int oldPos = 0;
for (int i = 0; i < keyRange; ++i) {
int key = keyMin + i;
newKeys[i] = key;
if (keys[oldPos] == key) {
newBranches[i] = branches[oldPos];
++oldPos;
} else
newBranches[i] = defaultBranch;
}
assert oldPos == keys.length;
emitTABLESWITCH(newKeys, newBranches, defaultBranch);
} else
emitLOOKUPSWITCH(keys, branches, defaultBranch);
}
/**
* Emits a method invocation instruction choosen according to
* the caracteristics of the given method.
*
* @param method The method to be invoked.
*/
public void emitINVOKE(JMethod method) {
String mName = method.getName();
String cName = method.getOwner().getName();
JMethodType mType = (JMethodType)method.getType();
if (method.isStatic())
emitINVOKESTATIC(cName, mName, mType);
else if (method.getOwner().isInterface())
emitINVOKEINTERFACE(cName, mName, mType);
else
emitINVOKEVIRTUAL(cName, mName, mType);
}
}
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