本文整理汇总了Golang中rsc/io/c2go/cc.Expr.Type方法的典型用法代码示例。如果您正苦于以下问题：Golang Expr.Type方法的具体用法？Golang Expr.Type怎么用？Golang Expr.Type使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类rsc/io/c2go/cc.Expr的用法示例。
在下文中一共展示了Expr.Type方法的2个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的Golang代码示例。
示例1: forceConvert
func forceConvert(fn *cc.Decl, x *cc.Expr, actual, targ *cc.Type) {
if isEmptyInterface(targ) {
return
}
if isEmptyInterface(actual) {
old := copyExpr(x)
x.Op = TypeAssert
x.Left = old
x.Right = nil
x.List = nil
x.Type = targ
x.XType = targ
return
}
if isNumericConst(x) && targ != nil {
switch targ.Kind {
case cc.Ptr, Slice:
if x.Op == cc.Number && x.Text == "0" {
x.Op = cc.Name
x.Text = "nil"
x.XType = targ
}
case String:
if x.Op == cc.Number && x.Text == "0" {
x.Op = cc.Name
x.Text = `""`
x.XType = targ
}
}
return
}
if x.Op == cc.Name && x.Text == "nil" && targ != nil {
switch targ.Kind {
case cc.Func, cc.Ptr, Slice:
return
case String:
x.Text = `""`
x.XType = targ
x.XDecl = nil
return
}
}
if actual == nil || targ == nil {
return
}
if actual.Kind == Ideal && Int8 <= targ.Kind && targ.Kind <= Float64 {
return
}
if x != nil && x.Op == cc.Name && x.Text == "nil" {
if targ.Kind == cc.Func || targ.Kind == cc.Ptr || targ.Kind == Slice {
return
}
}
// Func conversions are never useful.
// If the func types are different, the conversion will fail;
// if not, the conversion is unnecessary.
// Either way the conversion is an eyesore.
if targ.Kind == cc.Func || targ.Kind == cc.Ptr && targ.Base.Kind == cc.Func {
return
}
if actual.Kind == Bool && Int8 <= targ.Kind && targ.Kind <= Float64 {
old := copyExpr(x)
if targ.Kind == Int {
x.Op = cc.Call
x.Left = &cc.Expr{Op: cc.Name, Text: "bool2int"}
x.List = []*cc.Expr{old}
x.Right = nil
} else {
x.Op = cc.Cast
x.Left = &cc.Expr{Op: cc.Call, Left: &cc.Expr{Op: cc.Name, Text: "bool2int"}, List: []*cc.Expr{old}}
x.Type = targ
}
return
}
if actual.Kind == cc.Array && targ.Kind == Slice && sameType(actual.Base, targ.Base) {
old := copyExpr(x)
x.Op = ExprSlice
x.List = []*cc.Expr{old, nil, nil}
x.Left = nil
x.Right = nil
return
}
if actual.Kind == Slice && targ.Kind == cc.Ptr && sameType(actual.Base, targ.Base) {
if isCall(x, "make") {
return
}
old := copyExpr(x)
x.Op = cc.Addr
x.Left = &cc.Expr{Op: cc.Index, Left: old, Right: &cc.Expr{Op: cc.Number, Text: "0"}}
return
}
//.........这里部分代码省略.........
示例2: fixGoTypesExpr
func fixGoTypesExpr(fn *cc.Decl, x *cc.Expr, targ *cc.Type) (ret *cc.Type) {
if x == nil {
return nil
}
defer func() {
x.XType = ret
}()
if x.Op == cc.Paren {
return fixGoTypesExpr(fn, x.Left, targ)
}
// Make explicit C's implicit conversions from boolean to non-boolean and vice versa.
switch x.Op {
case cc.AndAnd, cc.OrOr, cc.Not, cc.EqEq, cc.Lt, cc.LtEq, cc.Gt, cc.GtEq, cc.NotEq:
if targ != nil && targ.Kind != Bool {
old := copyExpr(x)
if targ.Kind == Int {
x.Op = cc.Call
x.Left = &cc.Expr{Op: cc.Name, Text: "bool2int"}
x.List = []*cc.Expr{old}
x.Right = nil
} else {
x.Op = cc.Cast
x.Left = &cc.Expr{Op: cc.Call, Left: &cc.Expr{Op: cc.Name, Text: "bool2int"}, List: []*cc.Expr{old}}
x.Type = targ
}
fixGoTypesExpr(fn, old, boolType)
return targ
}
default:
if targ != nil && targ.Kind == Bool {
old := copyExpr(x)
left := fixGoTypesExpr(fn, old, nil)
if left != nil && left.Kind == Bool {
return targ
}
if old.Op == cc.Number {
switch old.Text {
case "1":
x.Op = cc.Name
x.Text = "true"
return targ
case "0":
x.Op = cc.Name
x.Text = "false"
return targ
}
}
x.Op = cc.NotEq
x.Left = old
x.Right = zeroFor(left)
fixSpecialCompare(fn, x)
return targ
}
}
fixArray(fn, x)
switch x.Op {
default:
panic(fmt.Sprintf("unexpected construct %v in fixGoTypesExpr - %v - %v", GoString(x), x.Op, x.Span))
case ExprType:
// inserted by a rewrite
return nil
case ExprSlice:
// inserted by rewriteLen
left := fixGoTypesExpr(fn, x.List[0], targ)
fixGoTypesExpr(fn, x.List[1], nil)
fixGoTypesExpr(fn, x.List[2], nil)
return left
case cc.Comma:
for i, y := range x.List {
t := targ
if i+1 < len(x.List) {
t = nil
}
fixGoTypesExpr(fn, y, t)
}
return nil
case ExprBlock:
for _, stmt := range x.Block {
fixGoTypesStmt(nil, fn, stmt)
}
return nil
case cc.Add, cc.And, cc.Div, cc.Mod, cc.Mul, cc.Or, cc.Sub, cc.Xor:
if x.Op == cc.Sub && isPtrSliceOrArray(x.Left.XType) && isPtrSliceOrArray(x.Right.XType) {
left := fixGoTypesExpr(fn, x.Left, nil)
right := fixGoTypesExpr(fn, x.Right, nil)
if left != nil && right != nil && left.Kind != right.Kind {
if left.Kind == Slice {
forceConvert(fn, x.Right, right, left)
} else {
forceConvert(fn, x.Left, left, right)
//.........这里部分代码省略.........