// 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)
}
// NewGlobalVar returns a new global variable declaration based on the given
// name and global variable.
func NewGlobalVarDecl(gname, globalVar interface{}) (*ir.GlobalDecl, error) {
if globalVar, ok := globalVar.(*GlobalVar); ok {
name, err := getGlobalName(gname)
if err != nil {
return nil, errutil.Err(err)
}
// Global variable declaration.
if globalVar.val == nil {
return ir.NewGlobalDecl(name, globalVar.typ, globalVar.immutable)
}
// Global variable definition.
return ir.NewGlobalDef(name, globalVar.val, globalVar.immutable)
}
return nil, errutil.Newf("invalid global variable type; expected *GlobalVar, got %T", globalVar)
}