func (v *Codegen) genDefaultValue(typ parser.Type) llvm.Value {
typ = typ.ActualType()
// Generate default struct values
if structType, ok := typ.(*parser.StructType); ok {
lit := createStructInitializer(structType)
if lit != nil {
return v.genStructLiteral(lit)
} else {
return llvm.Undef(v.typeToLLVMType(structType))
}
}
if tupleType, ok := typ.(*parser.TupleType); ok {
values := make([]llvm.Value, len(tupleType.Members))
for idx, member := range tupleType.Members {
values[idx] = v.genDefaultValue(member)
}
return llvm.ConstStruct(values, false)
}
if typ.IsIntegerType() || typ == parser.PRIMITIVE_bool {
return llvm.ConstInt(v.typeToLLVMType(typ), 0, false)
}
if typ.IsFloatingType() {
return llvm.ConstFloat(v.typeToLLVMType(typ), 0)
}
panic("type does not have default value: " + typ.TypeName())
}
func (v *Codegen) genBinop(operator parser.BinOpType, resType, lhandType, rhandType parser.Type, lhand, rhand llvm.Value) llvm.Value {
if lhand.IsNil() || rhand.IsNil() {
v.err("invalid binary expr")
} else {
switch operator {
// Arithmetic
case parser.BINOP_ADD:
if resType.IsFloatingType() {
return v.builder().CreateFAdd(lhand, rhand, "")
} else {
return v.builder().CreateAdd(lhand, rhand, "")
}
case parser.BINOP_SUB:
if resType.IsFloatingType() {
return v.builder().CreateFSub(lhand, rhand, "")
} else {
return v.builder().CreateSub(lhand, rhand, "")
}
case parser.BINOP_MUL:
if resType.IsFloatingType() {
return v.builder().CreateFMul(lhand, rhand, "")
} else {
return v.builder().CreateMul(lhand, rhand, "")
}
case parser.BINOP_DIV:
if resType.IsFloatingType() {
return v.builder().CreateFDiv(lhand, rhand, "")
} else {
if resType.(parser.PrimitiveType).IsSigned() {
return v.builder().CreateSDiv(lhand, rhand, "")
} else {
return v.builder().CreateUDiv(lhand, rhand, "")
}
}
case parser.BINOP_MOD:
if resType.IsFloatingType() {
return v.builder().CreateFRem(lhand, rhand, "")
} else {
if resType.(parser.PrimitiveType).IsSigned() {
return v.builder().CreateSRem(lhand, rhand, "")
} else {
return v.builder().CreateURem(lhand, rhand, "")
}
}
// Comparison
case parser.BINOP_GREATER, parser.BINOP_LESS, parser.BINOP_GREATER_EQ, parser.BINOP_LESS_EQ, parser.BINOP_EQ, parser.BINOP_NOT_EQ:
if lhandType.IsFloatingType() {
return v.builder().CreateFCmp(comparisonOpToFloatPredicate(operator), lhand, rhand, "")
} else {
return v.builder().CreateICmp(comparisonOpToIntPredicate(operator, lhandType.IsSigned()), lhand, rhand, "")
}
// Bitwise
case parser.BINOP_BIT_AND:
return v.builder().CreateAnd(lhand, rhand, "")
case parser.BINOP_BIT_OR:
return v.builder().CreateOr(lhand, rhand, "")
case parser.BINOP_BIT_XOR:
return v.builder().CreateXor(lhand, rhand, "")
case parser.BINOP_BIT_LEFT:
return v.builder().CreateShl(lhand, rhand, "")
case parser.BINOP_BIT_RIGHT:
// TODO make sure both operands are same type (create type cast here?)
// TODO in semantic.go, make sure rhand is *unsigned* (LLVM always treats it that way)
// TODO doc this
if lhandType.IsSigned() {
return v.builder().CreateAShr(lhand, rhand, "")
} else {
return v.builder().CreateLShr(lhand, rhand, "")
}
default:
panic("umimplented binop")
}
}
panic("unreachable")
}