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don't crash but give proper error on "-X" expression where X is not a signed type

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This commit is contained in:
Irmen de Jong 2021-11-06 18:06:01 +01:00
parent 74456d1135
commit 4270c04856
1 changed files with 2 additions and 3 deletions
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5
compiler/src/prog8/compiler/astprocessing/AstChecker.kt
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@ -793,11 +793,10 @@ internal class AstChecker(private val program: Program,
}
override fun visit(expr: PrefixExpression) {
val idt = expr.inferType(program)
if(!idt.isKnown)
val dt = expr.expression.inferType(program).getOr(DataType.UNDEFINED)
if(dt==DataType.UNDEFINED)
return // any error should be reported elsewhere
val dt = idt.getOr(DataType.UNDEFINED)
if(expr.operator=="-") {
if (dt != DataType.BYTE && dt != DataType.WORD && dt != DataType.FLOAT) {
errors.err("can only take negative of a signed number type", expr.position)