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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
namespace System.Reflection.Emit {
using System;
using System.Threading;
using System.Diagnostics.Contracts;
public struct OpCode
{
//
// Use packed bitfield for flags to avoid code bloat
//
internal const int OperandTypeMask = 0x1F; // 000000000000000000000000000XXXXX
internal const int FlowControlShift = 5; // 00000000000000000000000XXXX00000
internal const int FlowControlMask = 0x0F;
internal const int OpCodeTypeShift = 9; // 00000000000000000000XXX000000000
internal const int OpCodeTypeMask = 0x07;
internal const int StackBehaviourPopShift = 12; // 000000000000000XXXXX000000000000
internal const int StackBehaviourPushShift = 17; // 0000000000XXXXX00000000000000000
internal const int StackBehaviourMask = 0x1F;
internal const int SizeShift = 22; // 00000000XX0000000000000000000000
internal const int SizeMask = 0x03;
internal const int EndsUncondJmpBlkFlag = 0x01000000; // 0000000X000000000000000000000000
// unused // 0000XXX0000000000000000000000000
internal const int StackChangeShift = 28; // XXXX0000000000000000000000000000
private OpCodeValues m_value;
private int m_flags;
internal OpCode(OpCodeValues value, int flags)
{
m_value = value;
m_flags = flags;
}
internal bool EndsUncondJmpBlk()
{
return (m_flags & EndsUncondJmpBlkFlag) != 0;
}
internal int StackChange()
{
return (m_flags >> StackChangeShift);
}
public OperandType OperandType
{
get
{
return (OperandType)(m_flags & OperandTypeMask);
}
}
public FlowControl FlowControl
{
get
{
return (FlowControl)((m_flags >> FlowControlShift) & FlowControlMask);
}
}
public OpCodeType OpCodeType
{
get
{
return (OpCodeType)((m_flags >> OpCodeTypeShift) & OpCodeTypeMask);
}
}
public StackBehaviour StackBehaviourPop
{
get
{
return (StackBehaviour)((m_flags >> StackBehaviourPopShift) & StackBehaviourMask);
}
}
public StackBehaviour StackBehaviourPush
{
get
{
return (StackBehaviour)((m_flags >> StackBehaviourPushShift) & StackBehaviourMask);
}
}
public int Size
{
get
{
return (m_flags >> SizeShift) & SizeMask;
}
}
public short Value
{
get
{
return (short)m_value;
}
}
private static volatile string[] g_nameCache;
public String Name
{
get
{
if (Size == 0)
return null;
// Create and cache the opcode names lazily. They should be rarely used (only for logging, etc.)
// Note that we do not any locks here because of we always get the same names. The last one wins.
string[] nameCache = g_nameCache;
if (nameCache == null) {
nameCache = new String[0x11f];
g_nameCache = nameCache;
}
OpCodeValues opCodeValue = (OpCodeValues)(ushort)Value;
int idx = (int)opCodeValue;
if (idx > 0xFF) {
if (idx >= 0xfe00 && idx <= 0xfe1e) {
// Transform two byte opcode value to lower range that's suitable
// for array index
idx = 0x100 + (idx - 0xfe00);
}
else {
// Unknown opcode
return null;
}
}
String name = Volatile.Read(ref nameCache[idx]);
if (name != null)
return name;
// Create ilasm style name from the enum value name.
name = Enum.GetName(typeof(OpCodeValues), opCodeValue).ToLowerInvariant().Replace("_", ".");
Volatile.Write(ref nameCache[idx], name);
return name;
}
}
[Pure]
public override bool Equals(Object obj)
{
if (obj is OpCode)
return Equals((OpCode)obj);
else
return false;
}
[Pure]
public bool Equals(OpCode obj)
{
return obj.Value == Value;
}
[Pure]
public static bool operator ==(OpCode a, OpCode b)
{
return a.Equals(b);
}
[Pure]
public static bool operator !=(OpCode a, OpCode b)
{
return !(a == b);
}
public override int GetHashCode()
{
return Value;
}
public override String ToString()
{
return Name;
}
}
}
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