public JavaInstruction(int offset, JavaOpCode opcode, JavaOperandData operands)
{
_offset = offset;
_opcode = opcode;
_operands = operands;
}
public static DisassembledMethod Disassemble(byte[] bytecode)
{
Contract.Requires<ArgumentNullException>(bytecode != null, "bytecode");
List<JavaInstruction> instructions = new List<JavaInstruction>();
List<SwitchData> switchData = new List<SwitchData>();
for (int i = 0; i < bytecode.Length; /*increment in loop*/)
{
int instructionStart = i;
JavaOpCode opcode = JavaOpCode.InstructionLookup[bytecode[instructionStart]];
if (opcode.Name == null)
throw new FormatException(string.Format("Encountered unrecognized opcode {0} at offset {1}.", bytecode[instructionStart], instructionStart));
int instructionLength = opcode.Size;
JavaOperandData operands = default(JavaOperandData);
switch (opcode.OperandType)
{
case JavaOperandType.InlineNone:
break;
case JavaOperandType.InlineI1:
operands = new JavaOperandData(ReadSByte(bytecode, instructionStart + 1));
break;
case JavaOperandType.InlineI2:
case JavaOperandType.InlineShortBranchTarget:
operands = new JavaOperandData(ReadInt16(bytecode, instructionStart + 1));
break;
case JavaOperandType.InlineBranchTarget:
operands = new JavaOperandData(ReadInt32(bytecode, instructionStart + 1));
break;
case JavaOperandType.InlineLookupSwitch:
{
int defaultStart = (instructionStart + 4) & (~3);
int defaultValue = ReadInt32(bytecode, defaultStart);
int pairsCount = ReadInt32(bytecode, defaultStart + sizeof(int));
if (pairsCount < 0)
throw new FormatException();
List<KeyValuePair<int, int>> pairs = new List<KeyValuePair<int, int>>();
for (int j = 0; j < pairsCount; j++)
{
int pairStart = defaultStart + (sizeof(int) * (2 + 2 * j));
pairs.Add(new KeyValuePair<int, int>(ReadInt32(bytecode, pairStart), ReadInt32(bytecode, pairStart + sizeof(int))));
}
switchData.Add(new LookupSwitchData(defaultValue, pairs));
int instructionSize = (defaultStart - instructionStart) + (sizeof(int) * (2 + 2 * pairsCount));
operands = new JavaOperandData((ushort)(switchData.Count - 1), instructionSize);
break;
}
case JavaOperandType.InlineTableSwitch:
{
int defaultStart = (instructionStart + 4) & (~3);
int defaultValue = ReadInt32(bytecode, defaultStart);
int lowValue = ReadInt32(bytecode, defaultStart + 4);
int highValue = ReadInt32(bytecode, defaultStart + 8);
if (highValue < lowValue)
throw new FormatException();
List<int> offsets = new List<int>();
for (int j = 0; j < highValue - lowValue + 1; j++)
{
int valueStart = defaultStart + (sizeof(int) * (3 + j));
offsets.Add(ReadInt32(bytecode, valueStart));
}
switchData.Add(new TableSwitchData(defaultValue, lowValue, highValue, offsets));
int instructionSize = (defaultStart - instructionStart) + (sizeof(int) * (3 + offsets.Count));
operands = new JavaOperandData((ushort)(switchData.Count - 1), instructionSize);
break;
}
case JavaOperandType.InlineShortConst:
case JavaOperandType.InlineVar:
case JavaOperandType.InlineArrayType:
operands = new JavaOperandData(ReadByte(bytecode, instructionStart + 1));
break;
case JavaOperandType.InlineConst:
case JavaOperandType.InlineField:
case JavaOperandType.InlineMethod:
case JavaOperandType.InlineType:
operands = new JavaOperandData(ReadUInt16(bytecode, instructionStart + 1));
break;
case JavaOperandType.InlineVar_I1:
operands = new JavaOperandData(ReadByte(bytecode, instructionStart + 1), ReadSByte(bytecode, instructionStart + 2));
break;
case JavaOperandType.InlineMethod_U1_0:
case JavaOperandType.InlineType_U1:
operands = new JavaOperandData(ReadUInt16(bytecode, instructionStart + 1), ReadByte(bytecode, instructionStart + 3));
break;
default:
throw new FormatException();
}
instructions.Add(new JavaInstruction(instructionStart, opcode, operands));
if (opcode.Size > 0)
{
i += opcode.Size;
}
else
{
switch (opcode.OpCode)
{
case JavaOpCodeTag.Tableswitch:
case JavaOpCodeTag.Lookupswitch:
i += operands.SwitchInstructionSize;
break;
case JavaOpCodeTag.Wide:
throw new NotImplementedException();
default:
throw new FormatException();
}
}
}
return new DisassembledMethod(instructions, switchData);
}
public static DisassembledMethod Disassemble(byte[] bytecode)
{
Contract.Requires <ArgumentNullException>(bytecode != null, "bytecode");
List <JavaInstruction> instructions = new List <JavaInstruction>();
List <SwitchData> switchData = new List <SwitchData>();
for (int i = 0; i < bytecode.Length; /*increment in loop*/)
{
int instructionStart = i;
JavaOpCode opcode = JavaOpCode.InstructionLookup[bytecode[instructionStart]];
if (opcode.Name == null)
{
throw new FormatException(string.Format("Encountered unrecognized opcode {0} at offset {1}.", bytecode[instructionStart], instructionStart));
}
int instructionLength = opcode.Size;
JavaOperandData operands = default(JavaOperandData);
switch (opcode.OperandType)
{
case JavaOperandType.InlineNone:
break;
case JavaOperandType.InlineI1:
operands = new JavaOperandData(ReadSByte(bytecode, instructionStart + 1));
break;
case JavaOperandType.InlineI2:
case JavaOperandType.InlineShortBranchTarget:
operands = new JavaOperandData(ReadInt16(bytecode, instructionStart + 1));
break;
case JavaOperandType.InlineBranchTarget:
operands = new JavaOperandData(ReadInt32(bytecode, instructionStart + 1));
break;
case JavaOperandType.InlineLookupSwitch:
{
int defaultStart = (instructionStart + 4) & (~3);
int defaultValue = ReadInt32(bytecode, defaultStart);
int pairsCount = ReadInt32(bytecode, defaultStart + sizeof(int));
if (pairsCount < 0)
{
throw new FormatException();
}
List <KeyValuePair <int, int> > pairs = new List <KeyValuePair <int, int> >();
for (int j = 0; j < pairsCount; j++)
{
int pairStart = defaultStart + (sizeof(int) * (2 + 2 * j));
pairs.Add(new KeyValuePair <int, int>(ReadInt32(bytecode, pairStart), ReadInt32(bytecode, pairStart + sizeof(int))));
}
switchData.Add(new LookupSwitchData(defaultValue, pairs));
int instructionSize = (defaultStart - instructionStart) + (sizeof(int) * (2 + 2 * pairsCount));
operands = new JavaOperandData((ushort)(switchData.Count - 1), instructionSize);
break;
}
case JavaOperandType.InlineTableSwitch:
{
int defaultStart = (instructionStart + 4) & (~3);
int defaultValue = ReadInt32(bytecode, defaultStart);
int lowValue = ReadInt32(bytecode, defaultStart + 4);
int highValue = ReadInt32(bytecode, defaultStart + 8);
if (highValue < lowValue)
{
throw new FormatException();
}
List <int> offsets = new List <int>();
for (int j = 0; j < highValue - lowValue + 1; j++)
{
int valueStart = defaultStart + (sizeof(int) * (3 + j));
offsets.Add(ReadInt32(bytecode, valueStart));
}
switchData.Add(new TableSwitchData(defaultValue, lowValue, highValue, offsets));
int instructionSize = (defaultStart - instructionStart) + (sizeof(int) * (3 + offsets.Count));
operands = new JavaOperandData((ushort)(switchData.Count - 1), instructionSize);
break;
}
case JavaOperandType.InlineShortConst:
case JavaOperandType.InlineVar:
case JavaOperandType.InlineArrayType:
operands = new JavaOperandData(ReadByte(bytecode, instructionStart + 1));
break;
case JavaOperandType.InlineConst:
case JavaOperandType.InlineField:
case JavaOperandType.InlineMethod:
case JavaOperandType.InlineType:
operands = new JavaOperandData(ReadUInt16(bytecode, instructionStart + 1));
break;
case JavaOperandType.InlineVar_I1:
operands = new JavaOperandData(ReadByte(bytecode, instructionStart + 1), ReadSByte(bytecode, instructionStart + 2));
break;
case JavaOperandType.InlineMethod_U1_0:
case JavaOperandType.InlineType_U1:
operands = new JavaOperandData(ReadUInt16(bytecode, instructionStart + 1), ReadByte(bytecode, instructionStart + 3));
break;
default:
throw new FormatException();
}
instructions.Add(new JavaInstruction(instructionStart, opcode, operands));
if (opcode.Size > 0)
{
i += opcode.Size;
}
else
{
switch (opcode.OpCode)
{
case JavaOpCodeTag.Tableswitch:
case JavaOpCodeTag.Lookupswitch:
i += operands.SwitchInstructionSize;
break;
case JavaOpCodeTag.Wide:
throw new NotImplementedException();
default:
throw new FormatException();
}
}
}
return(new DisassembledMethod(instructions, switchData));
}
public JavaInstruction(int offset, JavaOpCode opcode, JavaOperandData operands)
{
_offset = offset;
_opcode = opcode;
_operands = operands;
}
