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Code Issues Releases Activity

Made StringInstructionHandler self-contained by removing dependency on OpcodeMap

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bird_egop 2025-04-13 02:20:49 +03:00
parent bdd691a021
commit efd9141b39
1 changed files with 23 additions and 5 deletions
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28
X86Disassembler/X86/Handlers/String/StringInstructionHandler.cs
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@ -5,6 +5,19 @@ namespace X86Disassembler.X86.Handlers.String;
/// </summary> /// </summary>
public class StringInstructionHandler : InstructionHandler public class StringInstructionHandler : InstructionHandler
{ {
// Dictionary mapping opcodes to their mnemonics
private static readonly Dictionary<byte, string> _mnemonics = new Dictionary<byte, string>
{
{ 0xA4, "movs" }, // MOVSB
{ 0xA5, "movs" }, // MOVSD
{ 0xAA, "stos" }, // STOSB
{ 0xAB, "stos" }, // STOSD
{ 0xAC, "lods" }, // LODSB
{ 0xAD, "lods" }, // LODSD
{ 0xAE, "scas" }, // SCASB
{ 0xAF, "scas" } // SCASD
};
/// <summary> /// <summary>
/// Initializes a new instance of the StringInstructionHandler class /// Initializes a new instance of the StringInstructionHandler class
/// </summary> /// </summary>
@ -24,10 +37,7 @@ public class StringInstructionHandler : InstructionHandler
public override bool CanHandle(byte opcode) public override bool CanHandle(byte opcode)
{ {
// Check if the opcode is a string instruction // Check if the opcode is a string instruction
return opcode == 0xA4 || opcode == 0xA5 || // MOVS return _mnemonics.ContainsKey(opcode);
opcode == 0xAA || opcode == 0xAB || // STOS
opcode == 0xAC || opcode == 0xAD || // LODS
opcode == 0xAE || opcode == 0xAF; // SCAS
} }
/// <summary> /// <summary>
@ -39,7 +49,15 @@ public class StringInstructionHandler : InstructionHandler
public override bool Decode(byte opcode, Instruction instruction) public override bool Decode(byte opcode, Instruction instruction)
{ {
// Set the mnemonic // Set the mnemonic
instruction.Mnemonic = OpcodeMap.GetMnemonic(opcode); if (_mnemonics.TryGetValue(opcode, out string? mnemonic))
{
instruction.Mnemonic = mnemonic;
}
else
{
// This shouldn't happen if CanHandle is called first
return false;
}
// Set the operands based on the string operation // Set the operands based on the string operation
switch (opcode) switch (opcode)