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//
// Instruction.cs
//
// Author:
// Jb Evain (jbevain@gmail.com)
//
// Copyright (c) 2008 - 2011 Jb Evain
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
using System;
using System.Text;
namespace Mono.Cecil.Cil {
public sealed class Instruction {
internal int offset;
internal OpCode opcode;
internal object operand;
internal Instruction previous;
internal Instruction next;
SequencePoint sequence_point;
public int Offset {
get { return offset; }
set { offset = value; }
}
public OpCode OpCode {
get { return opcode; }
set { opcode = value; }
}
public object Operand {
get { return operand; }
set { operand = value; }
}
public Instruction Previous {
get { return previous; }
set { previous = value; }
}
public Instruction Next {
get { return next; }
set { next = value; }
}
public SequencePoint SequencePoint {
get { return sequence_point; }
set { sequence_point = value; }
}
internal Instruction (int offset, OpCode opCode)
{
this.offset = offset;
this.opcode = opCode;
}
internal Instruction (OpCode opcode, object operand)
{
this.opcode = opcode;
this.operand = operand;
}
public int GetSize ()
{
int size = opcode.Size;
switch (opcode.OperandType) {
case OperandType.InlineSwitch:
return size + (1 + ((Instruction []) operand).Length) * 4;
case OperandType.InlineI8:
case OperandType.InlineR:
return size + 8;
case OperandType.InlineBrTarget:
case OperandType.InlineField:
case OperandType.InlineI:
case OperandType.InlineMethod:
case OperandType.InlineString:
case OperandType.InlineTok:
case OperandType.InlineType:
case OperandType.ShortInlineR:
case OperandType.InlineSig:
return size + 4;
case OperandType.InlineArg:
case OperandType.InlineVar:
return size + 2;
case OperandType.ShortInlineBrTarget:
case OperandType.ShortInlineI:
case OperandType.ShortInlineArg:
case OperandType.ShortInlineVar:
return size + 1;
default:
return size;
}
}
public override string ToString ()
{
var instruction = new StringBuilder ();
AppendLabel (instruction, this);
instruction.Append (':');
instruction.Append (' ');
instruction.Append (opcode.Name);
if (operand == null)
return instruction.ToString ();
instruction.Append (' ');
switch (opcode.OperandType) {
case OperandType.ShortInlineBrTarget:
case OperandType.InlineBrTarget:
AppendLabel (instruction, (Instruction) operand);
break;
case OperandType.InlineSwitch:
var labels = (Instruction []) operand;
for (int i = 0; i < labels.Length; i++) {
if (i > 0)
instruction.Append (',');
AppendLabel (instruction, labels [i]);
}
break;
case OperandType.InlineString:
instruction.Append ('\"');
instruction.Append (operand);
instruction.Append ('\"');
break;
default:
instruction.Append (operand);
break;
}
return instruction.ToString ();
}
static void AppendLabel (StringBuilder builder, Instruction instruction)
{
builder.Append ("IL_");
builder.Append (instruction.offset.ToString ("x4"));
}
public static Instruction Create (OpCode opcode)
{
if (opcode.OperandType != OperandType.InlineNone)
throw new ArgumentException ("opcode");
return new Instruction (opcode, null);
}
public static Instruction Create (OpCode opcode, TypeReference type)
{
if (type == null)
throw new ArgumentNullException ("type");
if (opcode.OperandType != OperandType.InlineType &&
opcode.OperandType != OperandType.InlineTok)
throw new ArgumentException ("opcode");
return new Instruction (opcode, type);
}
public static Instruction Create (OpCode opcode, CallSite site)
{
if (site == null)
throw new ArgumentNullException ("site");
if (opcode.Code != Code.Calli)
throw new ArgumentException ("code");
return new Instruction (opcode, site);
}
public static Instruction Create (OpCode opcode, MethodReference method)
{
if (method == null)
throw new ArgumentNullException ("method");
if (opcode.OperandType != OperandType.InlineMethod &&
opcode.OperandType != OperandType.InlineTok)
throw new ArgumentException ("opcode");
return new Instruction (opcode, method);
}
public static Instruction Create (OpCode opcode, FieldReference field)
{
if (field == null)
throw new ArgumentNullException ("field");
if (opcode.OperandType != OperandType.InlineField &&
opcode.OperandType != OperandType.InlineTok)
throw new ArgumentException ("opcode");
return new Instruction (opcode, field);
}
public static Instruction Create (OpCode opcode, string value)
{
if (value == null)
throw new ArgumentNullException ("value");
if (opcode.OperandType != OperandType.InlineString)
throw new ArgumentException ("opcode");
return new Instruction (opcode, value);
}
public static Instruction Create (OpCode opcode, sbyte value)
{
if (opcode.OperandType != OperandType.ShortInlineI &&
opcode != OpCodes.Ldc_I4_S)
throw new ArgumentException ("opcode");
return new Instruction (opcode, value);
}
public static Instruction Create (OpCode opcode, byte value)
{
if (opcode.OperandType != OperandType.ShortInlineI ||
opcode == OpCodes.Ldc_I4_S)
throw new ArgumentException ("opcode");
return new Instruction (opcode, value);
}
public static Instruction Create (OpCode opcode, int value)
{
if (opcode.OperandType != OperandType.InlineI)
throw new ArgumentException ("opcode");
return new Instruction (opcode, value);
}
public static Instruction Create (OpCode opcode, long value)
{
if (opcode.OperandType != OperandType.InlineI8)
throw new ArgumentException ("opcode");
return new Instruction (opcode, value);
}
public static Instruction Create (OpCode opcode, float value)
{
if (opcode.OperandType != OperandType.ShortInlineR)
throw new ArgumentException ("opcode");
return new Instruction (opcode, value);
}
public static Instruction Create (OpCode opcode, double value)
{
if (opcode.OperandType != OperandType.InlineR)
throw new ArgumentException ("opcode");
return new Instruction (opcode, value);
}
public static Instruction Create (OpCode opcode, Instruction target)
{
if (target == null)
throw new ArgumentNullException ("target");
if (opcode.OperandType != OperandType.InlineBrTarget &&
opcode.OperandType != OperandType.ShortInlineBrTarget)
throw new ArgumentException ("opcode");
return new Instruction (opcode, target);
}
public static Instruction Create (OpCode opcode, Instruction [] targets)
{
if (targets == null)
throw new ArgumentNullException ("targets");
if (opcode.OperandType != OperandType.InlineSwitch)
throw new ArgumentException ("opcode");
return new Instruction (opcode, targets);
}
public static Instruction Create (OpCode opcode, VariableDefinition variable)
{
if (variable == null)
throw new ArgumentNullException ("variable");
if (opcode.OperandType != OperandType.ShortInlineVar &&
opcode.OperandType != OperandType.InlineVar)
throw new ArgumentException ("opcode");
return new Instruction (opcode, variable);
}
public static Instruction Create (OpCode opcode, ParameterDefinition parameter)
{
if (parameter == null)
throw new ArgumentNullException ("parameter");
if (opcode.OperandType != OperandType.ShortInlineArg &&
opcode.OperandType != OperandType.InlineArg)
throw new ArgumentException ("opcode");
return new Instruction (opcode, parameter);
}
}
}
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