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Strip single-byte format items on single-byte instructions

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It's possible to have format descriptors on instructions that are
left over from when the bytes were treated as data.  Single-byte
formats were being allowed on single-byte instructions, which
confused things later when the code tried to apply the format to
an instruction with no operand.
This commit is contained in:
Andy McFadden 2018-10-05 11:10:03 -07:00
parent e6b0438d5d
commit 4639af8b0e
2 changed files with 17 additions and 5 deletions
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17
SourceGen/DisasmProject.cs
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@ -532,20 +532,29 @@ namespace SourceGen {
}
if (mAnattribs[offset].IsInstructionStart) {
// Check length for instruction formatters.
// Check length for instruction formatters. This can happen if you format
// a bunch of bytes as single-byte data items and then add a code entry
// point.
if (kvp.Value.Length != mAnattribs[offset].Length) {
genLog.LogW("Unexpected length on instr format descriptor (" +
genLog.LogW("+" + offset.ToString("x6") +
": unexpected length on instr format descriptor (" +
kvp.Value.Length + " vs " + mAnattribs[offset].Length + ")");
continue; // ignore this one
}
if (kvp.Value.Length == 1) {
// No operand to format!
genLog.LogW("+" + offset.ToString("x6") +
": unexpected format descriptor on single-byte op");
continue; // ignore this one
}
if (!kvp.Value.IsValidForInstruction) {
genLog.LogW("Descriptor not valid for instruction: " + kvp.Value);
continue; // ignore this one
}
} else if (mAnattribs[offset].IsInstruction) {
// Mid-instruction format.
genLog.LogW("Unexpected mid-instruction format descriptor at +" +
offset.ToString("x6"));
genLog.LogW("+" + offset.ToString("x6") +
": unexpected mid-instruction format descriptor");
continue; // ignore this one
}

5
SourceGen/DisplayList.cs
View File

@ -1096,8 +1096,11 @@ namespace SourceGen {
operandForSymbol = attr.OperandAddress;
}
// Check Length to watch for bogus descriptors (?)
// Check Length to watch for bogus descriptors. ApplyFormatDescriptors() should
// have discarded anything appropriate, so we might be able to eliminate this test.
if (attr.DataDescriptor != null && attr.Length == attr.DataDescriptor.Length) {
Debug.Assert(operandLen > 0);
// Format operand as directed.
if (op.AddrMode == OpDef.AddressMode.BlockMove) {
// Special handling for the double-operand block move.