71 lines
1.5 KiB
Go
71 lines
1.5 KiB
Go
package core
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import (
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"fmt"
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"math"
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"git.urbach.dev/cli/q/src/asm"
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"git.urbach.dev/cli/q/src/errors"
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"git.urbach.dev/cli/q/src/eval"
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"git.urbach.dev/cli/q/src/expression"
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"git.urbach.dev/cli/q/src/types"
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)
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// EvaluateDot evaluates an access with the dot operator.
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func (f *Function) EvaluateDot(expr *expression.Expression) (eval.Value, error) {
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left := expr.Children[0]
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right := expr.Children[1]
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leftText := left.Token.Text(f.File.Bytes)
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rightText := right.Token.Text(f.File.Bytes)
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variable := f.VariableByName(leftText)
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if variable != nil {
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field := variable.Value.Typ.(*types.Pointer).To.(*types.Struct).FieldByName(rightText)
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value := eval.Memory{
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Typ: field.Type,
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Memory: asm.Memory{
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Base: variable.Value.Register,
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Offset: int8(field.Offset),
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OffsetRegister: math.MaxUint8,
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Length: byte(field.Type.Size()),
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},
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}
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return value, nil
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}
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constant, isConst := f.All.Constants[f.Package+"."+leftText+"."+rightText]
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if isConst {
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number, err := ToNumber(constant.Token, constant.File)
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if err != nil {
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return nil, err
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}
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value := eval.Number{
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Typ: types.AnyInt,
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Number: number,
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}
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return value, nil
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}
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uniqueName := fmt.Sprintf("%s.%s", leftText, rightText)
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function, exists := f.All.Functions[uniqueName]
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if exists {
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f.File.Imports[leftText].Used = true
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value := eval.Label{
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Typ: types.AnyPointer,
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Label: function.UniqueName,
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}
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return value, nil
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}
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return nil, errors.New(&errors.UnknownIdentifier{Name: uniqueName}, f.File, left.Token.Position)
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}
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