bool Pass2scan( TokenInstruction[] Tokens, int size )
{
// execute TokenInstructions to build MachineInstructions
bool passed = true;
SymbolDef cursymboldef;
Symbol ActiveNTTRuleID;
ClearMachineInstState();
// iterate through all the tokens and build machine instruction
// for each machine instruction need: optype, opinst, and up to 5 parameters
for ( int i = 0; i < size; i++ )
{
// lookup instruction type in library
cursymboldef = symbolTypeLib[ (int)Tokens[ i ].ID ];
ActiveNTTRuleID = (Symbol)Tokens[ i ].NTTRuleID;
currentLine = Tokens[ i ].line;
charPos = Tokens[ i ].pos;
switch ( ActiveNTTRuleID )
{
case Symbol.CONSTANT:
case Symbol.COLOR:
case Symbol.REG_PS1_4:
case Symbol.TEX_PS1_4:
case Symbol.REG_PS1_1_3:
case Symbol.TEX_PS1_1_3:
// registars can be used for read and write so they can be used for dst and arg
passed = SetOpParam( cursymboldef );
break;
case Symbol.DEFCONST:
case Symbol.UNARYOP:
case Symbol.BINARYOP:
case Symbol.TERNARYOP:
case Symbol.TEXOP_PS1_1_3:
case Symbol.TEXOP_PS1_4:
case Symbol.PHASEMARKER:
case Symbol.TEXCISCOP_PS1_1_3:
// if the last instruction has not been passed on then do it now
// make sure the pipe is clear for a new instruction
BuildMachineInst();
if ( opInst == Symbol.Invalid )
{
opInst = cursymboldef.ID;
}
else
{
passed = false;
}
break;
case Symbol.DSTMASK:
case Symbol.SRCREP:
case Symbol.TEXSWIZZLE:
// could be a dst mask or a arg replicator
// if dst mask and alpha included then make up a alpha instruction: maybe best to wait until instruction args completed
opParams[ argCnt ].MaskRep = (uint)cursymboldef.pass2Data;
break;
case Symbol.DSTMOD:
case Symbol.DSTSAT:
case Symbol.PRESRCMOD:
case Symbol.POSTSRCMOD:
opParams[ argCnt ].Mod |= cursymboldef.pass2Data;
break;
case Symbol.NUMVAL:
passed = SetOpParam( cursymboldef );
// keep track of how many values are used
// update Constants array position
constantsPos++;
break;
case Symbol.SEPERATOR:
argCnt++;
break;
} // end of switch
if ( !passed )
{
break;
}
}// end of for: i<TokenInstCnt
// check to see if there is still an instruction left in the pipe
if ( passed )
{
BuildMachineInst();
// if there are no more instructions in the pipe than OpInst should be invalid
if ( opInst != Symbol.Invalid )
{
passed = false;
}
}
return passed;
}
