internal void PrepareVariables(CompilerItem first)
{
int i;
int count = _functionPrototype.Arguments.Length;
for (i = 0; i < count; i++)
{
CompilerVar vdata = _argumentVariables[i];
// This is where variable scope starts.
vdata.FirstItem = first;
// If this will not be changed then it will be deallocated immediately.
vdata.LastItem = first;
}
}
internal void PatchMemoryOperands(CompilerItem start, CompilerItem stop)
{
CompilerItem current;
for (current = start; ; current = current.Next)
{
CompilerInstruction instruction = current as CompilerInstruction;
if (instruction != null)
{
Mem mem = instruction.MemoryOperand;
if (mem != null && (mem.Id & Operand.OperandIdTypeMask) == Operand.OperandIdTypeVar)
{
CompilerVar varData = _compiler.GetVarData(mem.Id);
Contract.Assert(varData != null);
if (varData.IsMemArgument)
{
mem.Base = _argumentsBaseReg;
mem.Displacement += varData.HomeMemoryOffset;
mem.Displacement += _argumentsBaseOffset;
}
else
{
VarMemBlock mb = varData.HomeMemoryData;
if (mb == null)
throw new CompilerException();
mem.Base = _variablesBaseReg;
mem.Displacement += mb.Offset;
mem.Displacement += _variablesBaseOffset;
}
}
}
if (current == stop)
break;
}
}
public void UnuseVarOnEndOfScope(CompilerItem e, VarAllocRecord rec)
{
Contract.Requires(e != null);
Contract.Requires(rec != null);
Contract.Requires(rec.VarData != null);
CompilerVar v = rec.VarData;
if (v.LastItem == e || (rec.VarFlags & VariableAlloc.UnuseAfterUse) != 0)
UnuseVar(v, VariableState.Unused);
}
internal void Clear()
{
Contract.Ensures(Function == null);
//_zone.clear();
_function = null;
_start = null;
_stop = null;
_state.Clear();
_active = null;
_forwardJumps = null;
_currentOffset = 0;
//_unreachable = 0;
_modifiedGPRegisters = RegisterMask.Zero;
_modifiedMMRegisters = RegisterMask.Zero;
_modifiedXMMRegisters = RegisterMask.Zero;
_allocableEBP = false;
_adjustESP = 0;
_argumentsBaseReg = RegIndex.Invalid;
_argumentsBaseOffset = 0;
_argumentsActualDisp = 0;
_variablesBaseReg = RegIndex.Invalid;
_variablesBaseOffset = 0;
_variablesActualDisp = 0;
_memUsed = null;
_memFree = null;
_mem4BlocksCount = 0;
_mem8BlocksCount = 0;
_mem16BlocksCount = 0;
_memBytesTotal = 0;
_backCode.Clear();
_backPos = 0;
}
public void UnuseVarOnEndOfScope(CompilerItem e, CompilerVar vdata)
{
Contract.Requires(e != null);
Contract.Requires(vdata != null);
if (vdata.LastItem == e)
UnuseVar(vdata, VariableState.Unused);
}