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package pass
import (
"errors"
"github.com/mmcloughlin/avo/ir"
"github.com/mmcloughlin/avo/operand"
)
// Verify pass validates an avo file.
var Verify = Concat(
InstructionPass(VerifyMemOperands),
)
// VerifyMemOperands checks the instruction's memory operands.
func VerifyMemOperands(i *ir.Instruction) error {
for _, op := range i.Operands {
m, ok := op.(operand.Mem)
if !ok {
continue
}
if m.Base == nil {
return errors.New("bad memory operand: missing base register")
}
if m.Index != nil && m.Scale == 0 {
return errors.New("bad memory operand: index register with scale 0")
}
}
return nil
}
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