Revision e9fdba28bc24263664b236ea2fb026326c582d33 authored by Ron Burkey on 24 December 2017, 21:04:22 UTC, committed by Ron Burkey on 24 December 2017, 21:04:22 UTC
1 parent d7b4237
ParseCHECKequals.c
/*
Copyright 2003-2004 Ronald S. Burkey <info@sandroid.org>
Copyright 2009 Jim Lawton <jim DOT lawton AT gmail DOT com>
This file is part of yaAGC.
yaAGC is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
yaAGC is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with yaAGC; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
Filename: ParseCHECKequals.c
Purpose: Assembles the CHECK= pseudo-op.
Mode: 2009-09-03 JL Added, based on original EQUALS parser.
*/
#include "yaYUL.h"
#include <stdlib.h>
#include <string.h>
extern Line_t CurrentFilename;
extern int CurrentLineInFile;
//------------------------------------------------------------------------
// Return 0 on success.
int ParseCHECKequals(ParseInput_t *InRecord, ParseOutput_t *OutRecord)
{
Address_t labelValue = { 1 };
Address_t checkValue = { 1 };
int lhValue, rhValue, i;
int lhValid = 0;
int rhValid = 0;
if (*InRecord->Label == 0)
{
strcpy(OutRecord->ErrorMessage, "Label must be supplied for CHECK= directive.");
OutRecord->Fatal = 1;
return (0);
}
else
{
Symbol_t *labelSymbol = GetSymbol(InRecord->Label);
if (labelSymbol == NULL)
{
sprintf(OutRecord->ErrorMessage, "Symbol \"%s\" not defined, skipping...", InRecord->Label);
OutRecord->Warning = 1;
return (0);
}
else
{
labelValue = labelSymbol->Value;
lhValue = labelValue.Value;
lhValid = 1;
}
}
if (*InRecord->Operand == 0 && *InRecord->Mod1 == 0)
{
strcpy(OutRecord->ErrorMessage, "Operand must be supplied for CHECK= directive.");
OutRecord->Fatal = 1;
return (0);
}
// Next, it may be that the operand is simply a number. If so, then
// we're talking about a simple constant.
i = GetOctOrDec(InRecord->Operand, &rhValue);
if (i)
{
// The operand is NOT a number. Presumably, it's a symbol.
i = FetchSymbolPlusOffset(&InRecord->ProgramCounter, InRecord->Operand, InRecord->Mod1, &checkValue);
if (i)
{
sprintf(OutRecord->ErrorMessage, "Symbol \"%s\" undefined or offset bad", InRecord->Operand);
OutRecord->Warning = 1;
return (0);
}
if (OpcodeOffset)
{
if (checkValue.Constant)
{
checkValue.Value += OpcodeOffset;
}
else
{
IncPc(&checkValue, OpcodeOffset, &checkValue);
}
rhValue = checkValue.Value;
rhValid = 1;
}
}
else
{
if (*InRecord->Operand == '+' || *InRecord->Operand == '-')
{
IncPc(&InRecord->ProgramCounter, rhValue, &checkValue);
}
else
{
if (rhValue < -16383 || rhValue > 32767)
{
strcpy(OutRecord->ErrorMessage, "Value out of range, truncating");
OutRecord->Warning = 1;
if (rhValue < -16383)
rhValue = -16383;
else if (rhValue > 32767)
rhValue = 32767;
}
checkValue.Invalid = 0;
checkValue.Constant = 1;
checkValue.Value = rhValue;
}
rhValue = checkValue.Value;
rhValid = 1;
}
if (lhValid == 1 && rhValid == 1)
{
if (lhValue != rhValue)
{
strcpy(OutRecord->ErrorMessage, "Address check failed");
OutRecord->Fatal = 1;
return (0);
}
}
return (0);
}
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