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fixed if expressions

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This commit is contained in:
Robin Bärtschi 2025-02-26 15:18:56 +01:00
parent e9a1ee0bab
commit b0b7ede252
3 changed files with 23 additions and 5 deletions
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3
asm/amd64/codegen.go
View File

@ -104,9 +104,10 @@ func cgInstruction(i ttir.Instruction) []Instruction {
return []Instruction{JmpInstruction(i)}
case *ttir.Copy:
return []Instruction{&SimpleInstruction{Opcode: Mov, Lhs: toAsmOperand(i.Dst), Rhs: toAsmOperand(i.Src)}}
default:
panic(fmt.Sprintf("unexpected ttir.Instruction: %#v", i))
}
return []Instruction{}
}
func cgBinary(b *ttir.Binary) []Instruction {

5
test.tt
View File

@ -1,8 +1,9 @@
fn main() = {
hi := 4;
if hi == 2 in hi = 3
else hi = 2;
if hi == 4 in
hi = 0
else hi = 1;
hi
};

18
ttir/emit.go
View File

@ -105,8 +105,11 @@ func emitExpression(expr tast.Expression) (Operand, []Instruction) {
instructions = append(instructions, &JumpIfZero{Value: condDst, Label: elseLabel})
thenDst, thenInstructions := emitExpression(expr.Then)
instructions = append(instructions, thenInstructions...)
if expr.Else != nil {
if !expr.ReturnType.IsSameType(types.Unit) {
instructions = append(instructions, &Copy{Src: thenDst, Dst: dst}, Jump(endOfIfLabel))
instructions = append(instructions, &Copy{Src: thenDst, Dst: dst})
}
instructions = append(instructions, Jump(endOfIfLabel))
} else {
dst = nil
}
@ -122,8 +125,21 @@ func emitExpression(expr tast.Expression) (Operand, []Instruction) {
instructions = append(instructions, Label(endOfIfLabel))
return dst, instructions
case *tast.AssignmentExpression:
ident := expr.Lhs.(*tast.VariableReference)
rhsDst, instructions := emitExpression(expr.Rhs)
instructions = append(instructions, &Copy{Src: rhsDst, Dst: &Var{Value: ident.Identifier}})
return nil, instructions
case *tast.VariableDeclaration:
rhsDst, instructions := emitExpression(expr.InitializingExpression)
instructions = append(instructions, &Copy{Src: rhsDst, Dst: &Var{Value: expr.Identifier}})
return nil, instructions
case *tast.VariableReference:
return &Var{Value: expr.Identifier}, []Instruction{}
default:
panic(fmt.Sprintf("unexpected tast.Expression: %#v", expr))
}