private object ResolveOperand(ByteCodeInstructionCollection allInstructions, ByteCodeInstruction instruction)
{
switch (instruction.OpCode.OperandType)
{
case ByteCodeOperandType.PrimitiveType:
return((PrimitiveType)(byte)instruction.Operand);
case ByteCodeOperandType.ConstantIndex:
case ByteCodeOperandType.WideConstantIndex:
return(OperandResolver?.ResolveConstant(Convert.ToInt32(instruction.Operand)) ?? instruction.Operand);
case ByteCodeOperandType.FieldIndex:
return(OperandResolver?.ResolveField(Convert.ToInt32(instruction.Operand)) ?? instruction.Operand);
case ByteCodeOperandType.MethodIndex:
return(OperandResolver?.ResolveMethod(Convert.ToInt32(instruction.Operand)) ?? instruction.Operand);
case ByteCodeOperandType.ClassIndex:
return(OperandResolver?.ResolveClass(Convert.ToInt32(instruction.Operand)) ?? instruction.Operand);
case ByteCodeOperandType.BranchOffset:
case ByteCodeOperandType.WideBranchOffset:
int offset = Convert.ToInt32(instruction.Operand);
return(allInstructions.GetByOffset(instruction.Offset + offset) ?? instruction.Operand);
}
return(instruction.Operand);
}
private object ResolveOperand(ByteCodeInstructionCollection allInstructions, ByteCodeInstruction instruction)
{
switch (instruction.OpCode.OperandType)
{
case ByteCodeOperandType.PrimitiveType:
return((PrimitiveType)(byte)instruction.Operand);
case ByteCodeOperandType.ConstantIndex:
case ByteCodeOperandType.WideConstantIndex:
return(OperandResolver?.ResolveConstant(Convert.ToInt32(instruction.Operand)) ?? instruction.Operand);
case ByteCodeOperandType.FieldIndex:
return(OperandResolver?.ResolveField(Convert.ToInt32(instruction.Operand)) ?? instruction.Operand);
case ByteCodeOperandType.MethodIndex:
return(OperandResolver?.ResolveMethod(Convert.ToInt32(instruction.Operand)) ?? instruction.Operand);
case ByteCodeOperandType.ClassIndex:
return(OperandResolver?.ResolveClass(Convert.ToInt32(instruction.Operand)) ?? instruction.Operand);
case ByteCodeOperandType.DynamicIndex:
return(OperandResolver?.ResolveDynamic(Convert.ToInt32(instruction.Operand) >> 16) ?? instruction.Operand);
case ByteCodeOperandType.BranchOffset:
case ByteCodeOperandType.WideBranchOffset:
int offset = Convert.ToInt32(instruction.Operand);
return(allInstructions.GetByOffset(instruction.Offset + offset) ?? instruction.Operand);
case ByteCodeOperandType.TableSwitch:
var table = (TableSwitch)instruction.Operand;
table.DefaultOffset += instruction.Offset;
for (int i = 0; i < table.Offsets.Count; i++)
{
table.Offsets[i] += instruction.Offset;
}
return(table);
case ByteCodeOperandType.LookupSwitch:
var lookup = (LookupSwitch)instruction.Operand;
lookup.DefaultOffset += instruction.Offset;
foreach (int key in lookup.Table.Keys)
{
lookup.Table[key] += instruction.Offset;
}
return(lookup);
}
return(instruction.Operand);
}
/// <summary>
/// Disassembles the entire input buffer into Java bytecode instructions, and resolves all operands wen possible.
/// </summary>
/// <returns>The list of disassembled instructions.</returns>
public IList <ByteCodeInstruction> ReadInstructions()
{
var result = new ByteCodeInstructionCollection();
while (_reader.Position < _reader.StartPosition + _reader.Length)
{
result.Add(ReadNextInstruction());
}
foreach (var instruction in result)
{
instruction.Operand = ResolveOperand(result, instruction);
}
return(result);
}
