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Code Issues Releases Activity

Added proper REPNE prefix handling and comprehensive string instruction tests

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This commit is contained in:
bird_egop
2025-04-13 02:26:49 +03:00
parent 79bf419c07
commit d0667950f8
2 changed files with 128 additions and 8 deletions
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32
X86Disassembler/X86/PrefixDecoder.cs
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@ -11,6 +11,7 @@ public class PrefixDecoder
private bool _segmentOverridePrefix;
private bool _lockPrefix;
private bool _repPrefix;
private bool _repnePrefix;
private string _segmentOverride = string.Empty;
/// <summary>
@ -31,6 +32,7 @@ public class PrefixDecoder
_segmentOverridePrefix = false;
_lockPrefix = false;
_repPrefix = false;
_repnePrefix = false;
_segmentOverride = string.Empty;
}
@ -70,11 +72,16 @@ public class PrefixDecoder
_lockPrefix = true;
return true;
}
else if (prefix == 0xF2 || prefix == 0xF3) // REP/REPNE prefix
else if (prefix == 0xF3) // REP prefix
{
_repPrefix = true;
return true;
}
else if (prefix == 0xF2) // REPNE prefix
{
_repnePrefix = true;
return true;
}
return false;
}
@ -125,14 +132,23 @@ public class PrefixDecoder
}
/// <summary>
/// Checks if the REP/REPNE prefix is present
/// Checks if the REP prefix is present
/// </summary>
/// <returns>True if the REP/REPNE prefix is present</returns>
/// <returns>True if the REP prefix is present</returns>
public bool HasRepPrefix()
{
return _repPrefix;
}
/// <summary>
/// Checks if the REPNE prefix is present
/// </summary>
/// <returns>True if the REPNE prefix is present</returns>
public bool HasRepnePrefix()
{
return _repnePrefix;
}
/// <summary>
/// Applies the segment override prefix to the operands string if applicable
/// </summary>
@ -154,13 +170,17 @@ public class PrefixDecoder
}
/// <summary>
/// Applies the REP prefix to the mnemonic if applicable
/// Applies the REP/REPNE prefix to the mnemonic if applicable
/// </summary>
/// <param name="mnemonic">The mnemonic</param>
/// <returns>The mnemonic with REP prefix applied</returns>
/// <returns>The mnemonic with REP/REPNE prefix applied</returns>
public string ApplyRepPrefix(string mnemonic)
{
if (_repPrefix && !mnemonic.StartsWith("rep"))
if (_repnePrefix && !mnemonic.StartsWith("repne"))
{
return $"repne {mnemonic}";
}
else if (_repPrefix && !mnemonic.StartsWith("rep"))
{
return $"rep {mnemonic}";
}