/// <summary>
/// Lowers set field operations into separate SSA values.
/// </summary>
private static void Lower(
RewriterContext context,
TypeLowering <ViewType> _,
SubViewValue value)
{
var builder = context.Builder;
var location = value.Location;
var pointer = builder.CreateGetField(
location,
value.Source,
new FieldSpan(0));
var newPointer = builder.CreateLoadElementAddress(
location,
pointer,
value.Offset);
var length = value.Length;
if (length.BasicValueType != BasicValueType.Int64)
{
length = builder.CreateConvertToInt64(
value.Location,
length);
}
var subView = builder.CreateDynamicStructure(
location,
newPointer,
length);
context.ReplaceAndRemove(value, subView);
}
/// <summary cref="IValueVisitor.Visit(SubViewValue)"/>
public void Visit(SubViewValue value)
{
var viewType = value.Type as ViewType;
var source = LoadAs <ViewVariable>(value.Source);
var offset = LoadAs <PrimitiveVariable>(value.Offset);
var length = LoadAs <PrimitiveVariable>(value.Length);
var target = AllocatePointerType(viewType.ElementType, viewType.AddressSpace);
MakeLoadElementAddress(
offset,
target,
source.Pointer);
var newSubView = new ViewVariable(
viewType,
target,
length);
Bind(value, newSubView);
}
/// <summary cref="IValueVisitor.Visit(SubViewValue)"/>
public void Visit(SubViewValue value)
{
var viewType = value.Type as ViewType;
var source = LoadAs <ViewImplementationRegister>(value.Source);
var offset = LoadPrimitive(value.Offset);
var length = LoadPrimitive(value.Length);
var targetAddressRegister = AllocatePlatformRegister(value, out RegisterDescription _);
MakeLoadElementAddress(
viewType,
offset,
targetAddressRegister,
source.Pointer);
var newSubView = new ViewImplementationRegister(
viewType,
targetAddressRegister,
length);
Bind(value, newSubView);
}
/// <summary cref="IValueVisitor.Visit(SubViewValue)"/>
public void Visit(SubViewValue value)
{
var source = LoadView(value.Source);
var offset = LoadAs <PrimitiveVariable>(value.Offset);
var length = LoadAs <PrimitiveVariable>(value.Length);
var target = AllocateView(value);
// Declare view
Declare(target);
// Assign pointer
using (var statement = BeginStatement(target, target.PointerFieldIndex))
{
statement.AppendCommand(CLInstructions.AddressOfOperation);
statement.Append(source);
statement.AppendField(target.PointerFieldIndex);
statement.AppendIndexer(offset);
}
// Assign length
using (var statement = BeginStatement(target, target.LengthFieldIndex))
statement.Append(length);
}
public void Visit(SubViewValue value)
{
}
/// <summary cref="IValueVisitor.Visit(SubViewValue)"/> public void Visit(SubViewValue value) => throw new InvalidCodeGenerationException();