/// <summary>
/// Implements the code to initialise the array.
/// </summary>
/// <param name="cg">The code generator object</param>
public override void Generate(CodeGenerator cg)
{
if (cg == null) {
throw new ArgumentNullException("cg");
}
Symbol sym = Identifier.Symbol;
// Simple array initialisation - just initialise the
// specified element. More complex initialisation requires
// a loop across the elements.
Debug.Assert(sym.IsArray);
if (Identifier.Indexes != null && Identifier.Indexes.Count > 0) {
if (Identifier.Indexes.Count == 1) {
NumberParseNode number = (NumberParseNode)Identifier.Indexes[0];
Debug.Assert(sym.Dimensions[0].LowerBound.IsConstant);
int index = number.Value.IntValue + (0 - sym.Dimensions[0].LowerBound.Value.IntValue);
GenerateStoreToArray(cg, sym, index, RangeValue);
} else {
Type [] paramTypes = new Type[Identifier.Indexes.Count + 1];
int index = 0;
cg.LoadLocal(sym);
while (index < Identifier.Indexes.Count) {
NumberParseNode number = (NumberParseNode)Identifier.Indexes[index];
Debug.Assert(sym.Dimensions[index].LowerBound.IsConstant);
cg.Emitter.LoadInteger(number.Value.IntValue + (0 - sym.Dimensions[index].LowerBound.Value.IntValue));
paramTypes[index++] = typeof(Int32);
}
cg.GenerateLoad(RangeValue);
paramTypes[index] = Symbol.SymTypeToSystemType(RangeValue.Type);
cg.Emitter.Call(cg.GetMethodForType(sym.SystemType, "Set", paramTypes));
}
}
else if (StartRange < EndRange + 4) {
// When initialising arrays less than 4 values, unroll
// the loop as it will be faster.
int index = StartRange;
while (index <= EndRange) {
GenerateStoreToArray(cg, sym, index++, RangeValue);
}
} else {
// For large arrays, generate code to initialise the elements
// to a specific value.
Label label1 = cg.Emitter.CreateLabel();
cg.Emitter.LoadInteger(StartRange);
LocalDescriptor tempIndex = cg.Emitter.GetTemporary(typeof(int));
cg.Emitter.StoreLocal(tempIndex);
cg.Emitter.MarkLabel(label1);
GenerateStoreToArray(cg, sym, tempIndex.Index, RangeValue);
cg.Emitter.LoadLocal(tempIndex);
cg.Emitter.LoadInteger(1);
cg.Emitter.Add(SymType.INTEGER);
cg.Emitter.Dup();
cg.Emitter.StoreLocal(tempIndex);
cg.Emitter.LoadInteger(EndRange);
cg.Emitter.BranchLessOrEqual(label1);
}
}
/// <summary>
/// Emit this code to load the value to the stack.
/// </summary>
/// <param name="cg">A CodeGenerator object</param>
/// <param name="returnType">The type required by the caller</param>
/// <returns>The symbol type of the value generated</returns>
public override SymType Generate(CodeGenerator cg, SymType returnType)
{
if (cg == null) {
throw new ArgumentNullException("cg");
}
cg.GenerateLoad(Value);
return Value.Type;
}
// Emit code that writes the variant value to the given array index where
// the array is specified by the symbol..
void GenerateStoreToArray(CodeGenerator cg, Symbol sym, int index, Variant value)
{
cg.LoadLocal(sym);
cg.Emitter.LoadInteger(index);
cg.GenerateLoad(value);
cg.Emitter.ConvertType(value.Type, sym.Type);
cg.Emitter.StoreElement(sym.Type);
}
