public Variables(bool UseRegPool, bool CalcRegUsage, Log log)
{
this.log = log;
if (UseRegPool)
{
sRegPool = new RegPool(log);
vRegPool = new RegPool(log);
}
if (CalcRegUsage)
{
sRegUsageCalc = new RegUsageCalc(true);
vRegUsageCalc = new RegUsageCalc(true);
}
}
public Variables(bool UseRegPool, bool CalcRegUsage, Log log)
{
this.log = log;
if (UseRegPool)
{
sRegPool = new RegPool(log);
vRegPool = new RegPool(log);
}
if (CalcRegUsage)
{
sRegUsageCalc = new RegUsageCalc(true);
vRegUsageCalc = new RegUsageCalc(true);
}
}
//public bool TryGetVar(string name, out Variable variable)
//{
// bool success = varsByName.TryGetValue(name, out variable);
// return success;
//}
/// <summary>Adds a GcnVar to the Vars collection while making sure it is valid.</summary>
public void AddVariable(List <Variable> pendingNewVarsToAddToNextStmt, Stmt stmt, Log log, char type, int size, char dataType, string options)
{
MatchCollection r2 = Regex.Matches(options,
@"(?<4>[a-z_][a-z_0-9]*)" +
@"((?<8>\ +(?<5>[sv])(?:(?<6>\d+)|(?:\[(?<6>\d+):(?<7>\d+)\])))|" + // assign exact reg
@"(?:\ +(?<9>[a-z_][a-z0-9_]*)(?:\[(?<10>\d+)\])?))?" + // Match to another Vars Reg#
@"\s*(,|$)\s*");
if (r2.Count <= 0) // there should be at least one match
{
log.Error("The new variable options could not be understood: " + options);
return;
}
foreach (Match m in r2)
{
GroupCollection g = m.Groups;
string name = g[4].Value;
string varsRegToCopy = "";
int varsRegToCopyIndex = 0;
int requestedReg = -1;
if (g[8].Success)
{
requestedReg = Int32.Parse(g[6].Value);
// error checking
if (type != g[5].Value[0])
{
log.Warning("The variable type ({0}) does not match the register type {1}", type, g[5].Value);
}
if (g[7].Success)
{
if ((int.Parse(g[7].Value) - requestedReg + 1) != (size / 4))
{
log.Warning("The variable size({0}) does not match the size of {1}[#:#]", size, type);
}
}
}
else if (g[9].Success)
{
varsRegToCopy = g[9].Value;
if (g[10].Success)
{
varsRegToCopyIndex = int.Parse(g[10].Value);
}
// make sure the name is not already added to the dictionary
Variable copySrc;
if (!varsByName.TryGetValue(varsRegToCopy, out copySrc))
{
log.Error("The past variable '{0}' cannot be found.", varsRegToCopy);
continue;
}
// if this is copying a reg from another variable and that variable is fixed then copy the reg now.
if (copySrc.isRegisterNumSpecifed)
{
requestedReg = copySrc.regNo + varsRegToCopyIndex;
}
if (type != (copySrc.isScaler ? 's' : 'v'))
{
log.Warning("'{0}' is type '{1}' however '{2}' is type '{3}'.", name, type, varsRegToCopy, copySrc.isScaler ? 's' : 'v');
}
if (requestedReg + ((size + 3) / 4) > copySrc.regNo + copySrc.RegsRequired)
{
log.Warning("The new variable '{0}' extends past the source variables last register.", name);
}
}
// make sure the reserved word is not in ISA_DATA.AsmReserveDWords, it will be added regardless
if (Array.BinarySearch <string>(ISA_DATA.AsmReserveDWords, name) >= 0)
{
log.Error("'{0}' cannot be used as a register name because it is a reserved word.", name);
continue;
}
// make sure the variable name is not a common alias
if (ISA_DATA.sRegAliases.ContainsKey(name))
{
log.Error("'{0}' cannot be used as a variable because it is a common register alias.", name);
continue;
}
// make sure the name is not already added to the dictionary
if (varsByName.ContainsKey(name))
{
log.Error("Variable '{0}' has already been declared.", name);
continue;
}
// lets now add it to the var dictionary
Variable var = new Variable()
{
name = name,
isScaler = (type == 's'),
size = size,
type = dataType,
regNo = requestedReg, // -1 for not yet assigned
variablesRegToCopy = varsRegToCopy,
variablesRegToCopyIndex = varsRegToCopyIndex,
isRegisterNumSpecifed = (requestedReg >= 0)
};
varsByName.Add(name, var);
pendingNewVarsToAddToNextStmt.Add(var);
// lets calculate usage
RegUsageCalc regUsageCalc = var.isScaler ? sRegUsageCalc : vRegUsageCalc;
if (regUsageCalc != null)
{
regUsageCalc.AddToCalc(var.size, stmt);
}
}
}
public void AssignRegNumbers(List <Stmt> gcnStmts)
{
foreach (Stmt stmt in gcnStmts)
{
// note: When using the 'free' keyword, variables are freed before the previous statement.
// Also, vars are freed before declarations so registers can be reused in the same instruction.
log.lineNum = stmt.lineNum;
////////////////////// free the vars //////////////////////
if (UsingRegPools)
{
foreach (Variable v in stmt.freeVars)
{
if (v.stmtTerminated != v.stmtDeclared)
{
(v.isScaler ? sRegPool : vRegPool).FreeReg(v.regNo);
}
else
{
log.Warning("Variable, {0}, was declared and last used in the same statement.", v.name);
}
}
}
////////////////////// declare new vars //////////////////////
// we first add variables that specify a register or variables
foreach (Variable v in stmt.newVars)
{
if (v.isRegisterNumSpecifed && !v.isRegisterFromAnotherVar)
{
// Adds a GcnVar to the Vars collection and also makes sure that it is valid.
// Lets add mark that register as used in the pool (if it is in the pool)
RegPool regPool = v.isScaler ? sRegPool : vRegPool;
if (UsingRegPools)
{
if (regPool.ReserveSpecificRegs(v.regNo, v.RegsRequired) < 0)
{
log.Error("The registers, {1}, used in '{0}' must was not found in the allowed register pool.", v.regNo, v.name);
}
}
// lets calculate usage
RegUsageCalc regUsageCalc = v.isScaler ? sRegUsageCalc : vRegUsageCalc;
if (regUsageCalc != null)
{
regUsageCalc.AddToCalc(v.size, stmt);
}
}
// process declarations with variable as register reference
else if (v.isRegisterFromAnotherVar)
{
Variable lu;
if (!varsByName.TryGetValue(v.variablesRegToCopy, out lu))
{
log.Error("Variable, '{0}', could not be found.", v.variablesRegToCopy);
}
else if (lu.stmtTerminated == null)
{
log.Error("Variable, '{0}', can not use the same register as '{1}' because its still in use.", v.name, lu.name);
}
else
{
int regNum = lu.regNo + v.variablesRegToCopyIndex;
RegPool regPool = v.isScaler ? sRegPool : vRegPool;
if (UsingRegPools)
{
v.regNo = regPool.ReserveSpecificRegs(regNum, v.size);
}
}
}
}
foreach (Variable v in stmt.newVars)
{
if (!v.isRegisterNumSpecifed) // exclude Registers with specified register numbers
{
v.regNo = (v.isScaler ? sRegPool : vRegPool).ReserveRegs(v.RegsRequired, v.RegsRequired);
}
}
// Replace the variables with register numbers.
//if (stmt.vars.Count > 0)
for (int i = stmt.vars.Count - 1; i >= 0; i--)
{
VariableUsageLoc v = stmt.vars[i];
stmt.options = stmt.options.Remove(v.startPos, v.varLength).Insert(v.startPos, v.RegAsString);
}
}
}
