// globalVarDecl lowers the given global variable declaration to LLVM IR,
// emitting code to m.
func (m *Module) globalVarDecl(n *ast.VarDecl) {
// Input:
// int x;
// Output:
// @x = global i32 0
ident := n.Name()
dbg.Printf("create global variable: %v", n)
typ := toIrType(n.Type())
var val value.Value
switch {
case n.Val != nil:
panic("support for global variable initializer not yet implemented")
case irtypes.IsInt(typ):
var err error
val, err = constant.NewInt(typ, "0")
if err != nil {
panic(fmt.Sprintf("unable to create integer constant; %v", err))
}
default:
val = constant.NewZeroInitializer(typ)
}
global, err := ir.NewGlobalDef(ident.Name, val, false)
if err != nil {
panic(fmt.Sprintf("unable to create global variable definition %q", ident))
}
m.setIdentValue(ident, global)
// Emit global variable definition.
m.emitGlobal(global)
}
func TestIsInt(t *testing.T) {
golden := []struct {
want bool
typ types.Type
}{
{want: false, typ: voidTyp}, // void
{want: true, typ: i1Typ}, // i1
{want: true, typ: i8Typ}, // i8
{want: true, typ: i32Typ}, // i32
{want: false, typ: f16Typ}, // half
{want: false, typ: f32Typ}, // float
{want: false, typ: f64Typ}, // double
{want: false, typ: f128Typ}, // fp128
{want: false, typ: f80_x86Typ}, // x86_fp80
{want: false, typ: f128_ppcTyp}, // ppc_fp128
{want: false, typ: mmxTyp}, // x86_mmx
{want: false, typ: labelTyp}, // label
{want: false, typ: metadataTyp}, // metadata
{want: false, typ: funcTyp}, // i32 (i32)
{want: false, typ: i8PtrTyp}, // i8*
{want: false, typ: f16PtrTyp}, // half*
{want: false, typ: mmxPtrTyp}, // x86_mmx*
{want: false, typ: funcPtrTyp}, // i32 (i32)*
{want: false, typ: i8x1VecTyp}, // <1 x i8>
{want: false, typ: i32x2VecTyp}, // <2 x i32>
{want: false, typ: f16x3VecTyp}, // <3 x half>
{want: false, typ: f32x4VecTyp}, // <4 x float>
{want: false, typ: f64x5VecTyp}, // <5 x double>
{want: false, typ: f128x6VecTyp}, // <6 x fp128>
{want: false, typ: f80_x86x7VecTyp}, // <7 x x86_fp80>
{want: false, typ: f128_ppcx8VecTyp}, // <8 x ppc_fp128>
{want: false, typ: i8Ptrx9VecTyp}, // <9 x i8*>
{want: false, typ: f16Ptrx10VecTyp}, // <10 x half*>
{want: false, typ: i8x1ArrTyp}, // [1 x i8]
{want: false, typ: i32x2ArrTyp}, // [2 x i32]
{want: false, typ: f16x3ArrTyp}, // [3 x half]
{want: false, typ: f32x4ArrTyp}, // [4 x float]
{want: false, typ: f64x5ArrTyp}, // [5 x double]
{want: false, typ: f128x6ArrTyp}, // [6 x fp128]
{want: false, typ: f80_x86x7ArrTyp}, // [7 x x86_fp80]
{want: false, typ: f128_ppcx8ArrTyp}, // [8 x ppc_fp128]
{want: false, typ: i8Ptrx9ArrTyp}, // [9 x i8*]
{want: false, typ: f16Ptrx10ArrTyp}, // [10 x half*]
{want: false, typ: structTyp}, // {i1, float, x86_mmx, i32 (i32)*, [1 x i8], <3 x half>}
}
for i, g := range golden {
got := types.IsInt(g.typ)
if got != g.want {
t.Errorf("i=%d: expected %v, got %v for type %q", i, g.want, got, g.typ)
}
}
}