func buildCallExpr(b *builder, expr *ast.CallExpr) *ref {
f := b.buildExpr(expr.Func)
if f == nil {
return nil
}
pos := ast.ExprPos(expr.Func)
if !f.IsSingle() {
b.Errorf(pos, "expression list is not callable")
return nil
}
funcType, ok := f.Type().(*types.Func) // the func sig in the builder
if !ok {
// not a function
b.Errorf(pos, "function call on non-callable")
return nil
}
args := buildExprList(b, expr.Args)
if args == nil {
return nil
}
if args.Len() != len(funcType.Args) {
b.Errorf(ast.ExprPos(expr), "argument expects (%s), got (%s)",
fmt8.Join(funcType.Args, ","), fmt8.Join(args.typ, ","),
)
return nil
}
// type check on parameters
for i, argType := range args.typ {
expect := funcType.Args[i].T
if !types.CanAssign(expect, argType) {
pos := ast.ExprPos(expr.Args.Exprs[i])
b.Errorf(pos, "argument %d expects %s, got %s",
i+1, expect, argType,
)
}
}
ret := new(ref)
ret.typ = funcType.RetTypes
for _, t := range funcType.RetTypes {
ret.ir = append(ret.ir, b.f.NewTemp(t.Size(), types.IsByte(t)))
}
// call the func in IR
b.b.Call(ret.ir, f.IR(), funcType.Sig, args.ir...)
return ret
}
func (b *builder) newLocal(t types.T, name string) ir.Ref {
return b.f.NewLocal(t.Size(), name, types.IsByte(t))
}
func (b *builder) newTemp(t types.T) *ref {
return newRef(t, b.f.NewTemp(t.Size(), types.IsByte(t)))
}