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package org.shedlang.compiler.shidtopatio;
import org.shedlang.compiler.ast.typed.FreeVariables;
import org.shedlang.compiler.patio.instructions.*;
import org.shedlang.compiler.patio.operands.PatioIntConst;
import org.shedlang.compiler.patio.operands.PatioLocalRef;
import org.shedlang.compiler.patio.operands.PatioOperand;
import org.shedlang.compiler.patio.types.PatioDataLayout;
import org.shedlang.compiler.patio.types.PatioDataLayouts;
import org.shedlang.compiler.patio.types.PatioTypes;
import org.shedlang.compiler.shid.instructions.ShidDefineStruct;
import org.shedlang.compiler.shid.instructions.ShidParam;
import org.shedlang.compiler.sources.Source;
import org.shedlang.compiler.types.SimpleStructType;
import org.shedlang.compiler.types.StructTypeInfo;
import org.shedlang.compiler.util.Lists;
import java.util.List;
public class ShidToPatioStructs {
private ShidToPatioStructs() {
}
private static PatioDataLayout unknownStructDataLayout() {
return ShidToPatioGc.gcObjectDataLayout(PatioDataLayouts.struct(List.of()));
}
private static final List<Integer> TAG_OFFSET
= ShidToPatioGc.runtimeTypeTagOffset();
private static StructRuntimeType structRuntimeType(
SimpleStructType type,
ShidToPatioContext context
) {
var structTypeInfo = context.structTypeInfo(type);
return structRuntimeType(type, structTypeInfo);
}
public static StructRuntimeType structRuntimeType(
SimpleStructType type,
StructTypeInfo structTypeInfo
) {
return new StructRuntimeType(type, structTypeInfo.fieldCount());
}
public record StructRuntimeType(SimpleStructType type, int fieldCount) implements RuntimeType {
@Override
public PatioDataLayout layout() {
return ShidToPatioGc.gcObjectDataLayout(
PatioDataLayouts.struct(Lists.repeat(
PatioDataLayouts.INT,
fieldCount
))
);
}
private static final List<Integer> GC_CHILDREN_OFFSET =
ShidToPatioGc.gcObjectOffset(List.of());
@Override
public List<Integer> gcChildrenOffset() {
return GC_CHILDREN_OFFSET;
}
@Override
public int gcChildrenCount() {
return fieldCount;
}
public List<Integer> tagOffset() {
return TAG_OFFSET;
}
public List<Integer> fieldOffset(int fieldIndex) {
return ShidToPatioGc.gcObjectOffset(List.of(fieldIndex));
}
}
public static ShidToPatioContext createType(
PatioLocalRef destination,
SimpleStructType type,
List<ShidDefineStruct.Field> fields,
Source source,
ShidToPatioContext context
) {
var structTypeInfo = context.structTypeInfo(type);
var params = fields.stream()
.map(field -> new ShidParam(field.name(), field.source()))
.toList();
return ShidToPatioFunctions.create(
destination,
type.name(),
structTypeInfo.fieldsArePositional() ? params : List.of(),
structTypeInfo.fieldsArePositional() ? List.of() : params,
FreeVariables.empty(),
bodyContext -> {
var valuePointerResult = bodyContext.allocateVal(
ShidToPatioLocalSpace.STRUCT_VALUE_POINTER,
PatioTypes.DATA_PTR
);
var valuePointer = valuePointerResult.value();
bodyContext = valuePointerResult.context();
var structRuntimeType = structRuntimeType(type, context);
bodyContext = ShidToPatioGc.alloc(
valuePointer,
structRuntimeType,
source,
bodyContext
);
bodyContext = bodyContext
.addInstruction(new PatioMemoryStore(
valuePointer,
structRuntimeType.layout(),
structRuntimeType.tagOffset(),
PatioIntConst.of(context.structTag(type)),
source
));
for (var fieldIndex = 0; fieldIndex < fields.size(); fieldIndex++) {
var field = fields.get(fieldIndex);
bodyContext = bodyContext
.addInstruction(new PatioMemoryStore(
valuePointer,
structRuntimeType.layout(),
structRuntimeType.fieldOffset(fieldIndex),
bodyContext.shidLocalNameToLocal(field.name()),
source
));
}
var valueResult = bodyContext.allocateVal(
ShidToPatioLocalSpace.STRUCT_VALUE,
ShidToPatioTypes.VALUE_TYPE
);
var value = valueResult.value();
bodyContext = valueResult.context();
bodyContext = bodyContext.addInstruction(new PatioDataPtrToInt(
value,
valuePointer,
source
));
bodyContext = bodyContext.addInstruction(new PatioReturn(List.of(value), source));
return bodyContext;
},
source,
context
);
}
public static ShidToPatioContext fieldLoad(
PatioLocalRef destination,
PatioOperand receiver,
SimpleStructType type,
String fieldName,
Source source,
ShidToPatioContext context
) {
var valuePointerResult = context.allocateVal(
ShidToPatioLocalSpace.STRUCT_VALUE_POINTER,
PatioTypes.DATA_PTR
);
var valuePointer = valuePointerResult.value();
context = valuePointerResult.context();
context = context.addInstruction(new PatioIntToDataPtr(
valuePointer,
receiver,
source
));
var structRuntimeType = structRuntimeType(type, context);
var structTypeInfo = context.structTypeInfo(type);
var fieldIndex = structTypeInfo.fieldIndex(fieldName);
context = context.addInstruction(new PatioMemoryLoad(
destination,
valuePointer,
structRuntimeType.layout(),
structRuntimeType.fieldOffset(fieldIndex),
source
));
return context;
}
public static ShidToPatioContext tagLoad(
PatioLocalRef destination,
PatioOperand receiver,
Source source,
ShidToPatioContext context
) {
var valuePointerResult = context.allocateVal(
ShidToPatioLocalSpace.STRUCT_VALUE_POINTER,
PatioTypes.DATA_PTR
);
var valuePointer = valuePointerResult.value();
context = valuePointerResult.context();
context = context.addInstruction(new PatioIntToDataPtr(
valuePointer,
receiver,
source
));
var structDataLayout = unknownStructDataLayout();
context = context.addInstruction(new PatioMemoryLoad(
destination,
valuePointer,
structDataLayout,
TAG_OFFSET,
source
));
return context;
}
}
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