func buildMember(b *builder, m *tast.MemberExpr) *ref {
obj := b.buildExpr(m.Expr)
if !obj.IsSingle() {
panic("not single")
}
t := obj.Type()
if pkg, ok := t.(*types.Pkg); ok {
return buildPkgSym(b, m, pkg)
}
pt := types.PointerOf(t)
var tstruct *types.Struct
if pt != nil {
tstruct = pt.(*types.Struct)
} else {
tstruct = t.(*types.Struct)
}
addr := b.newPtr()
if pt != nil {
b.b.Assign(addr, obj.IR())
if obj != b.this {
nilPointerPanic(b, addr)
}
} else {
b.b.Arith(addr, nil, "&", obj.IR())
}
sym := m.Symbol
if sym.Type == tast.SymField {
return buildField(b, addr, sym.Obj.(*types.Field))
} else if sym.Type == tast.SymFunc {
recv := newRef(types.NewPointer(tstruct), addr)
method := sym.Obj.(*objFunc)
ft := method.Type().(*types.Func)
return newRecvRef(ft, recv, method.IR())
}
panic("bug")
}
func buildCallMake(b *builder, expr *ast.CallExpr, f tast.Expr) tast.Expr {
args := buildExprList(b, expr.Args)
if args == nil {
return nil
}
n := args.R().Len()
if n == 0 {
b.Errorf(expr.Lparen.Pos, "make() takes at least one argument")
return nil
}
argsList, ok := tast.MakeExprList(args)
if !ok {
b.Errorf(expr.Lparen.Pos, "make() only takes a literal list")
return nil
}
arg0 := argsList.Exprs[0]
t, ok := arg0.R().T.(*types.Type)
if !ok {
b.Errorf(expr.Lparen.Pos, "make() takes a type as the 1st argument")
return nil
}
switch st := t.T.(type) {
case *types.Slice:
if n != 3 {
b.Errorf(expr.Lparen.Pos, "make() slice takes 3 arguments")
return nil
}
size := argsList.Exprs[1]
pos := ast.ExprPos(expr.Args.Exprs[1])
size = checkArrayIndex(b, size, pos)
if size == nil {
return nil
}
start := argsList.Exprs[2]
startType := start.R().T
startPos := ast.ExprPos(expr.Args.Exprs[2])
if v, ok := types.NumConst(startType); ok {
start = constCastUint(b, startPos, v, start)
if start == nil {
return nil
}
} else if !types.IsBasic(startType, types.Uint) {
pt := types.PointerOf(startType)
if pt == nil || !types.SameType(pt, st.T) {
b.Errorf(startPos,
"make() takes an uint or a typed pointer as the 3rd arg",
)
return nil
}
}
callArgs := tast.NewExprList()
callArgs.Append(arg0)
callArgs.Append(size)
callArgs.Append(start)
r := tast.NewRef(st)
return &tast.CallExpr{f, callArgs, r}
}
b.Errorf(expr.Lparen.Pos, "cannot make() type %s", t.T)
return nil
}
func buildMember(b *builder, m *ast.MemberExpr) tast.Expr {
obj := b.buildExpr(m.Expr)
if obj == nil {
return nil
}
ref := obj.R()
if !ref.IsSingle() {
b.Errorf(m.Dot.Pos, "%s does not have any member", ref)
return nil
}
t := ref.T
if pkg, ok := t.(*types.Pkg); ok {
r, sym := buildPkgSym(b, m, pkg)
if r == nil {
return nil
}
// TODO: this can be further optimized
return &tast.MemberExpr{obj, m.Sub, r, sym}
}
pt := types.PointerOf(t)
var tstruct *types.Struct
var ok bool
if pt != nil {
if tstruct, ok = pt.(*types.Struct); !ok {
b.Errorf(m.Dot.Pos, "*%s is not a pointer of struct", t)
return nil
}
} else {
if tstruct, ok = t.(*types.Struct); !ok {
b.Errorf(m.Dot.Pos, "%s is not a struct", t)
return nil
}
}
symTable := tstruct.Syms
name := m.Sub.Lit
sym := symTable.Query(name)
if sym == nil {
b.Errorf(m.Sub.Pos, "struct %s has no member named %s",
tstruct, name,
)
return nil
} else if !sym8.IsPublic(name) && sym.Pkg() != b.path {
b.Errorf(m.Sub.Pos, "symbol %s is not public", name)
return nil
}
b.refSym(sym, m.Sub.Pos)
if sym.Type == tast.SymField {
t := sym.ObjType.(types.T)
r := tast.NewAddressableRef(t)
return &tast.MemberExpr{obj, m.Sub, r, sym}
} else if sym.Type == tast.SymFunc {
ft := sym.ObjType.(*types.Func)
r := tast.NewRef(ft.MethodFunc)
r.Recv = ref
return &tast.MemberExpr{obj, m.Sub, r, sym}
}
b.Errorf(m.Sub.Pos, "invalid sym type: %s", tast.SymStr(sym.Type))
return nil
}