func (p *exporter) value(x exact.Value) {
if trace {
p.tracef("value { ")
defer p.tracef("} ")
}
switch kind := x.Kind(); kind {
case exact.Bool:
tag := falseTag
if exact.BoolVal(x) {
tag = trueTag
}
p.int(tag)
case exact.Int:
if i, ok := exact.Int64Val(x); ok {
p.int(int64Tag)
p.int64(i)
return
}
p.int(floatTag)
p.float(x)
case exact.Float:
p.int(fractionTag)
p.fraction(x)
case exact.Complex:
p.int(complexTag)
p.fraction(exact.Real(x))
p.fraction(exact.Imag(x))
case exact.String:
p.int(stringTag)
p.string(exact.StringVal(x))
default:
panic(fmt.Sprintf("unexpected value kind %d", kind))
}
}
// valString returns the string representation for the value v.
// Setting floatFmt forces an integer value to be formatted in
// normalized floating-point format.
// TODO(gri) Move this code into package exact.
func valString(v exact.Value, floatFmt bool) string {
switch v.Kind() {
case exact.Int:
if floatFmt {
return floatString(v)
}
case exact.Float:
return floatString(v)
case exact.Complex:
re := exact.Real(v)
im := exact.Imag(v)
var s string
if exact.Sign(re) != 0 {
s = floatString(re)
if exact.Sign(im) >= 0 {
s += " + "
} else {
s += " - "
im = exact.UnaryOp(token.SUB, im, 0) // negate im
}
}
// im != 0, otherwise v would be exact.Int or exact.Float
return s + floatString(im) + "i"
}
return v.String()
}
func (cdd *CDD) Value(w *bytes.Buffer, ev exact.Value, t types.Type) {
k := t.Underlying().(*types.Basic).Kind()
// TODO: use t instead ev.Kind() in following switch
switch ev.Kind() {
case exact.Int:
writeInt(w, ev, k)
case exact.Float:
writeFloat(w, ev, k)
case exact.Complex:
switch k {
case types.Complex64:
k = types.Float32
case types.Complex128:
k = types.Float64
default:
k = types.UntypedFloat
}
writeFloat(w, exact.Real(ev), k)
im := exact.Imag(ev)
if exact.Sign(im) != -1 {
w.WriteByte('+')
}
writeFloat(w, im, k)
w.WriteByte('i')
case exact.String:
w.WriteString("EGSTR(")
w.WriteString(ev.String())
w.WriteByte(')')
default:
w.WriteString(ev.String())
}
}
// representableConst reports whether x can be represented as
// value of the given basic type kind and for the configuration
// provided (only needed for int/uint sizes).
//
// If rounded != nil, *rounded is set to the rounded value of x for
// representable floating-point values; it is left alone otherwise.
// It is ok to provide the addressof the first argument for rounded.
func representableConst(x exact.Value, conf *Config, as BasicKind, rounded *exact.Value) bool {
switch x.Kind() {
case exact.Unknown:
return true
case exact.Bool:
return as == Bool || as == UntypedBool
case exact.Int:
if x, ok := exact.Int64Val(x); ok {
switch as {
case Int:
var s = uint(conf.sizeof(Typ[as])) * 8
return int64(-1)<<(s-1) <= x && x <= int64(1)<<(s-1)-1
case Int8:
const s = 8
return -1<<(s-1) <= x && x <= 1<<(s-1)-1
case Int16:
const s = 16
return -1<<(s-1) <= x && x <= 1<<(s-1)-1
case Int32:
const s = 32
return -1<<(s-1) <= x && x <= 1<<(s-1)-1
case Int64:
return true
case Uint, Uintptr:
if s := uint(conf.sizeof(Typ[as])) * 8; s < 64 {
return 0 <= x && x <= int64(1)<<s-1
}
return 0 <= x
case Uint8:
const s = 8
return 0 <= x && x <= 1<<s-1
case Uint16:
const s = 16
return 0 <= x && x <= 1<<s-1
case Uint32:
const s = 32
return 0 <= x && x <= 1<<s-1
case Uint64:
return 0 <= x
case Float32, Float64, Complex64, Complex128,
UntypedInt, UntypedFloat, UntypedComplex:
return true
}
}
n := exact.BitLen(x)
switch as {
case Uint, Uintptr:
var s = uint(conf.sizeof(Typ[as])) * 8
return exact.Sign(x) >= 0 && n <= int(s)
case Uint64:
return exact.Sign(x) >= 0 && n <= 64
case Float32, Complex64:
if rounded == nil {
return fitsFloat32(x)
}
r := roundFloat32(x)
if r != nil {
*rounded = r
return true
}
case Float64, Complex128:
if rounded == nil {
return fitsFloat64(x)
}
r := roundFloat64(x)
if r != nil {
*rounded = r
return true
}
case UntypedInt, UntypedFloat, UntypedComplex:
return true
}
case exact.Float:
switch as {
case Float32, Complex64:
if rounded == nil {
return fitsFloat32(x)
}
r := roundFloat32(x)
if r != nil {
*rounded = r
return true
}
case Float64, Complex128:
if rounded == nil {
return fitsFloat64(x)
}
r := roundFloat64(x)
if r != nil {
*rounded = r
return true
}
case UntypedFloat, UntypedComplex:
return true
}
case exact.Complex:
switch as {
case Complex64:
if rounded == nil {
return fitsFloat32(exact.Real(x)) && fitsFloat32(exact.Imag(x))
}
re := roundFloat32(exact.Real(x))
im := roundFloat32(exact.Imag(x))
if re != nil && im != nil {
*rounded = exact.BinaryOp(re, token.ADD, exact.MakeImag(im))
return true
}
case Complex128:
if rounded == nil {
return fitsFloat64(exact.Real(x)) && fitsFloat64(exact.Imag(x))
}
re := roundFloat64(exact.Real(x))
im := roundFloat64(exact.Imag(x))
if re != nil && im != nil {
*rounded = exact.BinaryOp(re, token.ADD, exact.MakeImag(im))
return true
}
case UntypedComplex:
return true
}
case exact.String:
return as == String || as == UntypedString
default:
unreachable()
}
return false
}
// Complex128 returns the complex value of this constant truncated to
// fit a complex128.
//
func (c *Const) Complex128() complex128 {
re, _ := exact.Float64Val(exact.Real(c.Value))
im, _ := exact.Float64Val(exact.Imag(c.Value))
return complex(re, im)
}
func (c *compiler) NewConstValue(v exact.Value, typ types.Type) *LLVMValue {
switch {
case v.Kind() == exact.Unknown:
// TODO nil literals should be represented more appropriately once the exact-package supports it.
llvmtyp := c.types.ToLLVM(typ)
return c.NewValue(llvm.ConstNull(llvmtyp), typ)
case isString(typ):
if isUntyped(typ) {
typ = types.Typ[types.String]
}
llvmtyp := c.types.ToLLVM(typ)
strval := exact.StringVal(v)
strlen := len(strval)
i8ptr := llvm.PointerType(llvm.Int8Type(), 0)
var ptr llvm.Value
if strlen > 0 {
init := llvm.ConstString(strval, false)
ptr = llvm.AddGlobal(c.module.Module, init.Type(), "")
ptr.SetInitializer(init)
ptr = llvm.ConstBitCast(ptr, i8ptr)
} else {
ptr = llvm.ConstNull(i8ptr)
}
len_ := llvm.ConstInt(c.types.inttype, uint64(strlen), false)
llvmvalue := llvm.Undef(llvmtyp)
llvmvalue = llvm.ConstInsertValue(llvmvalue, ptr, []uint32{0})
llvmvalue = llvm.ConstInsertValue(llvmvalue, len_, []uint32{1})
return c.NewValue(llvmvalue, typ)
case isInteger(typ):
if isUntyped(typ) {
typ = types.Typ[types.Int]
}
llvmtyp := c.types.ToLLVM(typ)
var llvmvalue llvm.Value
if isUnsigned(typ) {
v, _ := exact.Uint64Val(v)
llvmvalue = llvm.ConstInt(llvmtyp, v, false)
} else {
v, _ := exact.Int64Val(v)
llvmvalue = llvm.ConstInt(llvmtyp, uint64(v), true)
}
return c.NewValue(llvmvalue, typ)
case isBoolean(typ):
if isUntyped(typ) {
typ = types.Typ[types.Bool]
}
var llvmvalue llvm.Value
if exact.BoolVal(v) {
llvmvalue = llvm.ConstAllOnes(llvm.Int1Type())
} else {
llvmvalue = llvm.ConstNull(llvm.Int1Type())
}
return c.NewValue(llvmvalue, typ)
case isFloat(typ):
if isUntyped(typ) {
typ = types.Typ[types.Float64]
}
llvmtyp := c.types.ToLLVM(typ)
floatval, _ := exact.Float64Val(v)
llvmvalue := llvm.ConstFloat(llvmtyp, floatval)
return c.NewValue(llvmvalue, typ)
case typ == types.Typ[types.UnsafePointer]:
llvmtyp := c.types.ToLLVM(typ)
v, _ := exact.Uint64Val(v)
llvmvalue := llvm.ConstInt(llvmtyp, v, false)
return c.NewValue(llvmvalue, typ)
case isComplex(typ):
if isUntyped(typ) {
typ = types.Typ[types.Complex128]
}
llvmtyp := c.types.ToLLVM(typ)
floattyp := llvmtyp.StructElementTypes()[0]
llvmvalue := llvm.ConstNull(llvmtyp)
realv := exact.Real(v)
imagv := exact.Imag(v)
realfloatval, _ := exact.Float64Val(realv)
imagfloatval, _ := exact.Float64Val(imagv)
llvmre := llvm.ConstFloat(floattyp, realfloatval)
llvmim := llvm.ConstFloat(floattyp, imagfloatval)
llvmvalue = llvm.ConstInsertValue(llvmvalue, llvmre, []uint32{0})
llvmvalue = llvm.ConstInsertValue(llvmvalue, llvmim, []uint32{1})
return c.NewValue(llvmvalue, typ)
}
// Special case for string -> [](byte|rune)
if u, ok := typ.Underlying().(*types.Slice); ok && isInteger(u.Elem()) {
if v.Kind() == exact.String {
strval := c.NewConstValue(v, types.Typ[types.String])
return strval.Convert(typ).(*LLVMValue)
}
}
panic(fmt.Sprintf("unhandled: t=%s(%T), v=%v(%T)", c.types.TypeString(typ), typ, v, v))
}
// Complex128 returns the complex value of this literal truncated to
// fit a complex128.
//
func (l *Literal) Complex128() complex128 {
re, _ := exact.Float64Val(exact.Real(l.Value))
im, _ := exact.Float64Val(exact.Imag(l.Value))
return complex(re, im)
}
// builtin type-checks a call to the built-in specified by id and
// returns true if the call is valid, with *x holding the result;
// but x.expr is not set. If the call is invalid, the result is
// false, and *x is undefined.
//
func (check *Checker) builtin(x *operand, call *ast.CallExpr, id builtinId) (_ bool) {
// append is the only built-in that permits the use of ... for the last argument
bin := predeclaredFuncs[id]
if call.Ellipsis.IsValid() && id != _Append {
check.invalidOp(call.Ellipsis, "invalid use of ... with built-in %s", bin.name)
check.use(call.Args...)
return
}
// For len(x) and cap(x) we need to know if x contains any function calls or
// receive operations. Save/restore current setting and set hasCallOrRecv to
// false for the evaluation of x so that we can check it afterwards.
// Note: We must do this _before_ calling unpack because unpack evaluates the
// first argument before we even call arg(x, 0)!
if id == _Len || id == _Cap {
defer func(b bool) {
check.hasCallOrRecv = b
}(check.hasCallOrRecv)
check.hasCallOrRecv = false
}
// determine actual arguments
var arg getter
nargs := len(call.Args)
switch id {
default:
// make argument getter
arg, nargs, _ = unpack(func(x *operand, i int) { check.expr(x, call.Args[i]) }, nargs, false)
// evaluate first argument, if present
if nargs > 0 {
arg(x, 0)
if x.mode == invalid {
return
}
}
case _Make, _New, _Offsetof, _Trace:
// arguments require special handling
}
// check argument count
{
msg := ""
if nargs < bin.nargs {
msg = "not enough"
} else if !bin.variadic && nargs > bin.nargs {
msg = "too many"
}
if msg != "" {
check.invalidOp(call.Rparen, "%s arguments for %s (expected %d, found %d)", msg, call, bin.nargs, nargs)
return
}
}
switch id {
case _Append:
// append(s S, x ...T) S, where T is the element type of S
// spec: "The variadic function append appends zero or more values x to s of type
// S, which must be a slice type, and returns the resulting slice, also of type S.
// The values x are passed to a parameter of type ...T where T is the element type
// of S and the respective parameter passing rules apply."
S := x.typ
var T Type
if s, _ := S.Underlying().(*Slice); s != nil {
T = s.elem
} else {
check.invalidArg(x.pos(), "%s is not a slice", x)
return
}
// remember arguments that have been evaluated already
alist := []operand{*x}
// spec: "As a special case, append also accepts a first argument assignable
// to type []byte with a second argument of string type followed by ... .
// This form appends the bytes of the string.
if nargs == 2 && call.Ellipsis.IsValid() && x.assignableTo(check.conf, NewSlice(UniverseByte)) {
arg(x, 1)
if x.mode == invalid {
return
}
if isString(x.typ) {
if check.Types != nil {
sig := makeSig(S, S, x.typ)
sig.variadic = true
check.recordBuiltinType(call.Fun, sig)
}
x.mode = value
x.typ = S
break
}
alist = append(alist, *x)
// fallthrough
}
// check general case by creating custom signature
sig := makeSig(S, S, NewSlice(T)) // []T required for variadic signature
sig.variadic = true
check.arguments(x, call, sig, func(x *operand, i int) {
// only evaluate arguments that have not been evaluated before
if i < len(alist) {
*x = alist[i]
return
}
arg(x, i)
}, nargs)
// ok to continue even if check.arguments reported errors
x.mode = value
x.typ = S
if check.Types != nil {
check.recordBuiltinType(call.Fun, sig)
}
case _Cap, _Len:
// cap(x)
// len(x)
mode := invalid
var typ Type
var val exact.Value
switch typ = implicitArrayDeref(x.typ.Underlying()); t := typ.(type) {
case *Basic:
if isString(t) && id == _Len {
if x.mode == constant {
mode = constant
val = exact.MakeInt64(int64(len(exact.StringVal(x.val))))
} else {
mode = value
}
}
case *Array:
mode = value
// spec: "The expressions len(s) and cap(s) are constants
// if the type of s is an array or pointer to an array and
// the expression s does not contain channel receives or
// function calls; in this case s is not evaluated."
if !check.hasCallOrRecv {
mode = constant
val = exact.MakeInt64(t.len)
}
case *Slice, *Chan:
mode = value
case *Map:
if id == _Len {
mode = value
}
}
if mode == invalid {
check.invalidArg(x.pos(), "%s for %s", x, bin.name)
return
}
x.mode = mode
x.typ = Typ[Int]
x.val = val
if check.Types != nil && mode != constant {
check.recordBuiltinType(call.Fun, makeSig(x.typ, typ))
}
case _Close:
// close(c)
c, _ := x.typ.Underlying().(*Chan)
if c == nil {
check.invalidArg(x.pos(), "%s is not a channel", x)
return
}
if c.dir == RecvOnly {
check.invalidArg(x.pos(), "%s must not be a receive-only channel", x)
return
}
x.mode = novalue
if check.Types != nil {
check.recordBuiltinType(call.Fun, makeSig(nil, c))
}
case _Complex:
// complex(x, y realT) complexT
if !check.complexArg(x) {
return
}
var y operand
arg(&y, 1)
if y.mode == invalid {
return
}
if !check.complexArg(&y) {
return
}
check.convertUntyped(x, y.typ)
if x.mode == invalid {
return
}
check.convertUntyped(&y, x.typ)
if y.mode == invalid {
return
}
if !Identical(x.typ, y.typ) {
check.invalidArg(x.pos(), "mismatched types %s and %s", x.typ, y.typ)
return
}
if x.mode == constant && y.mode == constant {
x.val = exact.BinaryOp(x.val, token.ADD, exact.MakeImag(y.val))
} else {
x.mode = value
}
realT := x.typ
complexT := Typ[Invalid]
switch realT.Underlying().(*Basic).kind {
case Float32:
complexT = Typ[Complex64]
case Float64:
complexT = Typ[Complex128]
case UntypedInt, UntypedRune, UntypedFloat:
if x.mode == constant {
realT = defaultType(realT).(*Basic)
complexT = Typ[UntypedComplex]
} else {
// untyped but not constant; probably because one
// operand is a non-constant shift of untyped lhs
realT = Typ[Float64]
complexT = Typ[Complex128]
}
default:
check.invalidArg(x.pos(), "float32 or float64 arguments expected")
return
}
x.typ = complexT
if check.Types != nil && x.mode != constant {
check.recordBuiltinType(call.Fun, makeSig(complexT, realT, realT))
}
if x.mode != constant {
// The arguments have now their final types, which at run-
// time will be materialized. Update the expression trees.
// If the current types are untyped, the materialized type
// is the respective default type.
// (If the result is constant, the arguments are never
// materialized and there is nothing to do.)
check.updateExprType(x.expr, realT, true)
check.updateExprType(y.expr, realT, true)
}
case _Copy:
// copy(x, y []T) int
var dst Type
if t, _ := x.typ.Underlying().(*Slice); t != nil {
dst = t.elem
}
var y operand
arg(&y, 1)
if y.mode == invalid {
return
}
var src Type
switch t := y.typ.Underlying().(type) {
case *Basic:
if isString(y.typ) {
src = UniverseByte
}
case *Slice:
src = t.elem
}
if dst == nil || src == nil {
check.invalidArg(x.pos(), "copy expects slice arguments; found %s and %s", x, &y)
return
}
if !Identical(dst, src) {
check.invalidArg(x.pos(), "arguments to copy %s and %s have different element types %s and %s", x, &y, dst, src)
return
}
if check.Types != nil {
check.recordBuiltinType(call.Fun, makeSig(Typ[Int], x.typ, y.typ))
}
x.mode = value
x.typ = Typ[Int]
case _Delete:
// delete(m, k)
m, _ := x.typ.Underlying().(*Map)
if m == nil {
check.invalidArg(x.pos(), "%s is not a map", x)
return
}
arg(x, 1) // k
if x.mode == invalid {
return
}
if !x.assignableTo(check.conf, m.key) {
check.invalidArg(x.pos(), "%s is not assignable to %s", x, m.key)
return
}
x.mode = novalue
if check.Types != nil {
check.recordBuiltinType(call.Fun, makeSig(nil, m, m.key))
}
case _Imag, _Real:
// imag(complexT) realT
// real(complexT) realT
if !isComplex(x.typ) {
check.invalidArg(x.pos(), "%s must be a complex number", x)
return
}
if x.mode == constant {
if id == _Real {
x.val = exact.Real(x.val)
} else {
x.val = exact.Imag(x.val)
}
} else {
x.mode = value
}
var k BasicKind
switch x.typ.Underlying().(*Basic).kind {
case Complex64:
k = Float32
case Complex128:
k = Float64
case UntypedComplex:
k = UntypedFloat
default:
unreachable()
}
if check.Types != nil && x.mode != constant {
check.recordBuiltinType(call.Fun, makeSig(Typ[k], x.typ))
}
x.typ = Typ[k]
case _Make:
// make(T, n)
// make(T, n, m)
// (no argument evaluated yet)
arg0 := call.Args[0]
T := check.typ(arg0)
if T == Typ[Invalid] {
return
}
var min int // minimum number of arguments
switch T.Underlying().(type) {
case *Slice:
min = 2
case *Map, *Chan:
min = 1
default:
check.invalidArg(arg0.Pos(), "cannot make %s; type must be slice, map, or channel", arg0)
return
}
if nargs < min || min+1 < nargs {
check.errorf(call.Pos(), "%s expects %d or %d arguments; found %d", call, min, min+1, nargs)
return
}
var sizes []int64 // constant integer arguments, if any
for _, arg := range call.Args[1:] {
if s, ok := check.index(arg, -1); ok && s >= 0 {
sizes = append(sizes, s)
}
}
if len(sizes) == 2 && sizes[0] > sizes[1] {
check.invalidArg(call.Args[1].Pos(), "length and capacity swapped")
// safe to continue
}
x.mode = value
x.typ = T
if check.Types != nil {
params := [...]Type{T, Typ[Int], Typ[Int]}
check.recordBuiltinType(call.Fun, makeSig(x.typ, params[:1+len(sizes)]...))
}
case _New:
// new(T)
// (no argument evaluated yet)
T := check.typ(call.Args[0])
if T == Typ[Invalid] {
return
}
x.mode = value
x.typ = &Pointer{base: T}
if check.Types != nil {
check.recordBuiltinType(call.Fun, makeSig(x.typ, T))
}
case _Panic:
// panic(x)
T := new(Interface)
if !check.assignment(x, T) {
assert(x.mode == invalid)
return
}
x.mode = novalue
if check.Types != nil {
check.recordBuiltinType(call.Fun, makeSig(nil, T))
}
case _Print, _Println:
// print(x, y, ...)
// println(x, y, ...)
var params []Type
if nargs > 0 {
params = make([]Type, nargs)
for i := 0; i < nargs; i++ {
if i > 0 {
arg(x, i) // first argument already evaluated
}
if !check.assignment(x, nil) {
assert(x.mode == invalid)
return
}
params[i] = x.typ
}
}
x.mode = novalue
if check.Types != nil {
check.recordBuiltinType(call.Fun, makeSig(nil, params...))
}
case _Recover:
// recover() interface{}
x.mode = value
x.typ = new(Interface)
if check.Types != nil {
check.recordBuiltinType(call.Fun, makeSig(x.typ))
}
case _Alignof:
// unsafe.Alignof(x T) uintptr
if !check.assignment(x, nil) {
assert(x.mode == invalid)
return
}
x.mode = constant
x.val = exact.MakeInt64(check.conf.alignof(x.typ))
x.typ = Typ[Uintptr]
// result is constant - no need to record signature
case _Offsetof:
// unsafe.Offsetof(x T) uintptr, where x must be a selector
// (no argument evaluated yet)
arg0 := call.Args[0]
selx, _ := unparen(arg0).(*ast.SelectorExpr)
if selx == nil {
check.invalidArg(arg0.Pos(), "%s is not a selector expression", arg0)
check.use(arg0)
return
}
check.expr(x, selx.X)
if x.mode == invalid {
return
}
base := derefStructPtr(x.typ)
sel := selx.Sel.Name
obj, index, indirect := LookupFieldOrMethod(base, false, check.pkg, sel)
switch obj.(type) {
case nil:
check.invalidArg(x.pos(), "%s has no single field %s", base, sel)
return
case *Func:
// TODO(gri) Using derefStructPtr may result in methods being found
// that don't actually exist. An error either way, but the error
// message is confusing. See: http://play.golang.org/p/al75v23kUy ,
// but go/types reports: "invalid argument: x.m is a method value".
check.invalidArg(arg0.Pos(), "%s is a method value", arg0)
return
}
if indirect {
check.invalidArg(x.pos(), "field %s is embedded via a pointer in %s", sel, base)
return
}
// TODO(gri) Should we pass x.typ instead of base (and indirect report if derefStructPtr indirected)?
check.recordSelection(selx, FieldVal, base, obj, index, false)
offs := check.conf.offsetof(base, index)
x.mode = constant
x.val = exact.MakeInt64(offs)
x.typ = Typ[Uintptr]
// result is constant - no need to record signature
case _Sizeof:
// unsafe.Sizeof(x T) uintptr
if !check.assignment(x, nil) {
assert(x.mode == invalid)
return
}
x.mode = constant
x.val = exact.MakeInt64(check.conf.sizeof(x.typ))
x.typ = Typ[Uintptr]
// result is constant - no need to record signature
case _Assert:
// assert(pred) causes a typechecker error if pred is false.
// The result of assert is the value of pred if there is no error.
// Note: assert is only available in self-test mode.
if x.mode != constant || !isBoolean(x.typ) {
check.invalidArg(x.pos(), "%s is not a boolean constant", x)
return
}
if x.val.Kind() != exact.Bool {
check.errorf(x.pos(), "internal error: value of %s should be a boolean constant", x)
return
}
if !exact.BoolVal(x.val) {
check.errorf(call.Pos(), "%s failed", call)
// compile-time assertion failure - safe to continue
}
// result is constant - no need to record signature
case _Trace:
// trace(x, y, z, ...) dumps the positions, expressions, and
// values of its arguments. The result of trace is the value
// of the first argument.
// Note: trace is only available in self-test mode.
// (no argument evaluated yet)
if nargs == 0 {
check.dump("%s: trace() without arguments", call.Pos())
x.mode = novalue
break
}
var t operand
x1 := x
for _, arg := range call.Args {
check.rawExpr(x1, arg, nil) // permit trace for types, e.g.: new(trace(T))
check.dump("%s: %s", x1.pos(), x1)
x1 = &t // use incoming x only for first argument
}
// trace is only available in test mode - no need to record signature
default:
unreachable()
}
return true
}
func (c *funcContext) translateExpr(expr ast.Expr) *expression {
exprType := c.p.info.Types[expr].Type
if value := c.p.info.Types[expr].Value; value != nil {
basic := types.Typ[types.String]
if value.Kind() != exact.String { // workaround for bug in go/types
basic = exprType.Underlying().(*types.Basic)
}
switch {
case basic.Info()&types.IsBoolean != 0:
return c.formatExpr("%s", strconv.FormatBool(exact.BoolVal(value)))
case basic.Info()&types.IsInteger != 0:
if is64Bit(basic) {
d, _ := exact.Uint64Val(value)
if basic.Kind() == types.Int64 {
return c.formatExpr("new %s(%s, %s)", c.typeName(exprType), strconv.FormatInt(int64(d)>>32, 10), strconv.FormatUint(d&(1<<32-1), 10))
}
return c.formatExpr("new %s(%s, %s)", c.typeName(exprType), strconv.FormatUint(d>>32, 10), strconv.FormatUint(d&(1<<32-1), 10))
}
d, _ := exact.Int64Val(value)
return c.formatExpr("%s", strconv.FormatInt(d, 10))
case basic.Info()&types.IsFloat != 0:
f, _ := exact.Float64Val(value)
return c.formatExpr("%s", strconv.FormatFloat(f, 'g', -1, 64))
case basic.Info()&types.IsComplex != 0:
r, _ := exact.Float64Val(exact.Real(value))
i, _ := exact.Float64Val(exact.Imag(value))
if basic.Kind() == types.UntypedComplex {
exprType = types.Typ[types.Complex128]
}
return c.formatExpr("new %s(%s, %s)", c.typeName(exprType), strconv.FormatFloat(r, 'g', -1, 64), strconv.FormatFloat(i, 'g', -1, 64))
case basic.Info()&types.IsString != 0:
return c.formatExpr("%s", encodeString(exact.StringVal(value)))
default:
panic("Unhandled constant type: " + basic.String())
}
}
switch e := expr.(type) {
case *ast.CompositeLit:
if ptrType, isPointer := exprType.(*types.Pointer); isPointer {
exprType = ptrType.Elem()
}
collectIndexedElements := func(elementType types.Type) []string {
elements := make([]string, 0)
i := 0
zero := c.zeroValue(elementType)
for _, element := range e.Elts {
if kve, isKve := element.(*ast.KeyValueExpr); isKve {
key, _ := exact.Int64Val(c.p.info.Types[kve.Key].Value)
i = int(key)
element = kve.Value
}
for len(elements) <= i {
elements = append(elements, zero)
}
elements[i] = c.translateImplicitConversionWithCloning(element, elementType).String()
i++
}
return elements
}
switch t := exprType.Underlying().(type) {
case *types.Array:
elements := collectIndexedElements(t.Elem())
if len(elements) == 0 {
return c.formatExpr("%s", c.zeroValue(t))
}
zero := c.zeroValue(t.Elem())
for len(elements) < int(t.Len()) {
elements = append(elements, zero)
}
return c.formatExpr(`$toNativeArray("%s", [%s])`, typeKind(t.Elem()), strings.Join(elements, ", "))
case *types.Slice:
return c.formatExpr("new %s([%s])", c.typeName(exprType), strings.Join(collectIndexedElements(t.Elem()), ", "))
case *types.Map:
mapVar := c.newVariable("_map")
keyVar := c.newVariable("_key")
assignments := ""
for _, element := range e.Elts {
kve := element.(*ast.KeyValueExpr)
assignments += c.formatExpr(`%s = %s, %s[%s] = { k: %s, v: %s }, `, keyVar, c.translateImplicitConversion(kve.Key, t.Key()), mapVar, c.makeKey(c.newIdent(keyVar, t.Key()), t.Key()), keyVar, c.translateImplicitConversion(kve.Value, t.Elem())).String()
}
return c.formatExpr("(%s = new $Map(), %s%s)", mapVar, assignments, mapVar)
case *types.Struct:
elements := make([]string, t.NumFields())
isKeyValue := true
if len(e.Elts) != 0 {
_, isKeyValue = e.Elts[0].(*ast.KeyValueExpr)
}
if !isKeyValue {
for i, element := range e.Elts {
elements[i] = c.translateImplicitConversion(element, t.Field(i).Type()).String()
}
}
if isKeyValue {
for i := range elements {
elements[i] = c.zeroValue(t.Field(i).Type())
}
for _, element := range e.Elts {
kve := element.(*ast.KeyValueExpr)
for j := range elements {
if kve.Key.(*ast.Ident).Name == t.Field(j).Name() {
elements[j] = c.translateImplicitConversion(kve.Value, t.Field(j).Type()).String()
break
}
}
}
}
return c.formatExpr("new %s.Ptr(%s)", c.typeName(exprType), strings.Join(elements, ", "))
default:
panic(fmt.Sprintf("Unhandled CompositeLit type: %T\n", t))
}
case *ast.FuncLit:
innerContext := c.p.analyzeFunction(exprType.(*types.Signature), e.Body)
params, body := innerContext.translateFunction(e.Type, e.Body.List, c.allVars)
if len(c.p.escapingVars) != 0 {
names := make([]string, 0, len(c.p.escapingVars))
for obj := range c.p.escapingVars {
names = append(names, c.p.objectVars[obj])
}
list := strings.Join(names, ", ")
return c.formatExpr("(function(%s) { return function(%s) {\n%s%s}; })(%s)", list, strings.Join(params, ", "), string(body), strings.Repeat("\t", c.p.indentation), list)
}
return c.formatExpr("(function(%s) {\n%s%s})", strings.Join(params, ", "), string(body), strings.Repeat("\t", c.p.indentation))
case *ast.UnaryExpr:
t := c.p.info.Types[e.X].Type
switch e.Op {
case token.AND:
switch t.Underlying().(type) {
case *types.Struct, *types.Array:
return c.translateExpr(e.X)
}
switch x := removeParens(e.X).(type) {
case *ast.CompositeLit:
return c.formatExpr("$newDataPointer(%e, %s)", x, c.typeName(c.p.info.Types[e].Type))
case *ast.Ident:
if obj := c.p.info.Uses[x]; c.p.escapingVars[obj] {
return c.formatExpr("new %s(function() { return this.$target[0]; }, function($v) { this.$target[0] = $v; }, %s)", c.typeName(exprType), c.p.objectVars[obj])
}
return c.formatExpr("new %s(function() { return %e; }, function($v) { %s })", c.typeName(exprType), x, c.translateAssign(x, "$v", exprType, false))
case *ast.SelectorExpr:
newSel := &ast.SelectorExpr{X: c.newIdent("this.$target", c.p.info.Types[x.X].Type), Sel: x.Sel}
c.p.info.Selections[newSel] = c.p.info.Selections[x]
return c.formatExpr("new %s(function() { return %e; }, function($v) { %s }, %e)", c.typeName(exprType), newSel, c.translateAssign(newSel, "$v", exprType, false), x.X)
case *ast.IndexExpr:
newIndex := &ast.IndexExpr{X: c.newIdent("this.$target", c.p.info.Types[x.X].Type), Index: x.Index}
return c.formatExpr("new %s(function() { return %e; }, function($v) { %s }, %e)", c.typeName(exprType), newIndex, c.translateAssign(newIndex, "$v", exprType, false), x.X)
default:
panic(fmt.Sprintf("Unhandled: %T\n", x))
}
case token.ARROW:
call := &ast.CallExpr{
Fun: c.newIdent("$recv", types.NewSignature(nil, nil, types.NewTuple(types.NewVar(0, nil, "", t)), types.NewTuple(types.NewVar(0, nil, "", exprType), types.NewVar(0, nil, "", types.Typ[types.Bool])), false)),
Args: []ast.Expr{e.X},
}
c.blocking[call] = true
if _, isTuple := exprType.(*types.Tuple); isTuple {
return c.formatExpr("%e", call)
}
return c.formatExpr("%e[0]", call)
}
basic := t.Underlying().(*types.Basic)
switch e.Op {
case token.ADD:
return c.translateExpr(e.X)
case token.SUB:
switch {
case is64Bit(basic):
return c.formatExpr("new %1s(-%2h, -%2l)", c.typeName(t), e.X)
case basic.Info()&types.IsComplex != 0:
return c.formatExpr("new %1s(-%2r, -%2i)", c.typeName(t), e.X)
case basic.Info()&types.IsUnsigned != 0:
return c.fixNumber(c.formatExpr("-%e", e.X), basic)
default:
return c.formatExpr("-%e", e.X)
}
case token.XOR:
if is64Bit(basic) {
return c.formatExpr("new %1s(~%2h, ~%2l >>> 0)", c.typeName(t), e.X)
}
return c.fixNumber(c.formatExpr("~%e", e.X), basic)
case token.NOT:
x := c.translateExpr(e.X)
if x.String() == "true" {
return c.formatExpr("false")
}
if x.String() == "false" {
return c.formatExpr("true")
}
return c.formatExpr("!%s", x)
default:
panic(e.Op)
}
case *ast.BinaryExpr:
if e.Op == token.NEQ {
return c.formatExpr("!(%s)", c.translateExpr(&ast.BinaryExpr{
X: e.X,
Op: token.EQL,
Y: e.Y,
}))
}
t := c.p.info.Types[e.X].Type
t2 := c.p.info.Types[e.Y].Type
_, isInterface := t2.Underlying().(*types.Interface)
if isInterface {
t = t2
}
if basic, isBasic := t.Underlying().(*types.Basic); isBasic && basic.Info()&types.IsNumeric != 0 {
if is64Bit(basic) {
switch e.Op {
case token.MUL:
return c.formatExpr("$mul64(%e, %e)", e.X, e.Y)
case token.QUO:
return c.formatExpr("$div64(%e, %e, false)", e.X, e.Y)
case token.REM:
return c.formatExpr("$div64(%e, %e, true)", e.X, e.Y)
case token.SHL:
return c.formatExpr("$shiftLeft64(%e, %f)", e.X, e.Y)
case token.SHR:
return c.formatExpr("$shiftRight%s(%e, %f)", toJavaScriptType(basic), e.X, e.Y)
case token.EQL:
return c.formatExpr("(%1h === %2h && %1l === %2l)", e.X, e.Y)
case token.LSS:
return c.formatExpr("(%1h < %2h || (%1h === %2h && %1l < %2l))", e.X, e.Y)
case token.LEQ:
return c.formatExpr("(%1h < %2h || (%1h === %2h && %1l <= %2l))", e.X, e.Y)
case token.GTR:
return c.formatExpr("(%1h > %2h || (%1h === %2h && %1l > %2l))", e.X, e.Y)
case token.GEQ:
return c.formatExpr("(%1h > %2h || (%1h === %2h && %1l >= %2l))", e.X, e.Y)
case token.ADD, token.SUB:
return c.formatExpr("new %3s(%1h %4t %2h, %1l %4t %2l)", e.X, e.Y, c.typeName(t), e.Op)
case token.AND, token.OR, token.XOR:
return c.formatExpr("new %3s(%1h %4t %2h, (%1l %4t %2l) >>> 0)", e.X, e.Y, c.typeName(t), e.Op)
case token.AND_NOT:
return c.formatExpr("new %3s(%1h &~ %2h, (%1l &~ %2l) >>> 0)", e.X, e.Y, c.typeName(t))
default:
panic(e.Op)
}
}
if basic.Info()&types.IsComplex != 0 {
switch e.Op {
case token.EQL:
if basic.Kind() == types.Complex64 {
return c.formatExpr("($float32IsEqual(%1r, %2r) && $float32IsEqual(%1i, %2i))", e.X, e.Y)
}
return c.formatExpr("(%1r === %2r && %1i === %2i)", e.X, e.Y)
case token.ADD, token.SUB:
return c.formatExpr("new %3s(%1r %4t %2r, %1i %4t %2i)", e.X, e.Y, c.typeName(t), e.Op)
case token.MUL:
return c.formatExpr("new %3s(%1r * %2r - %1i * %2i, %1r * %2i + %1i * %2r)", e.X, e.Y, c.typeName(t))
case token.QUO:
return c.formatExpr("$divComplex(%e, %e)", e.X, e.Y)
default:
panic(e.Op)
}
}
switch e.Op {
case token.EQL:
if basic.Kind() == types.Float32 {
return c.formatParenExpr("$float32IsEqual(%e, %e)", e.X, e.Y)
}
return c.formatParenExpr("%e === %e", e.X, e.Y)
case token.LSS, token.LEQ, token.GTR, token.GEQ:
return c.formatExpr("%e %t %e", e.X, e.Op, e.Y)
case token.ADD, token.SUB:
if basic.Info()&types.IsInteger != 0 {
return c.fixNumber(c.formatExpr("%e %t %e", e.X, e.Op, e.Y), basic)
}
return c.formatExpr("%e %t %e", e.X, e.Op, e.Y)
case token.MUL:
switch basic.Kind() {
case types.Int32, types.Int:
return c.formatParenExpr("(((%1e >>> 16 << 16) * %2e >> 0) + (%1e << 16 >>> 16) * %2e) >> 0", e.X, e.Y)
case types.Uint32, types.Uint, types.Uintptr:
return c.formatParenExpr("(((%1e >>> 16 << 16) * %2e >>> 0) + (%1e << 16 >>> 16) * %2e) >>> 0", e.X, e.Y)
case types.Float32, types.Float64:
return c.formatExpr("%e * %e", e.X, e.Y)
default:
return c.fixNumber(c.formatExpr("%e * %e", e.X, e.Y), basic)
}
case token.QUO:
if basic.Info()&types.IsInteger != 0 {
// cut off decimals
shift := ">>"
if basic.Info()&types.IsUnsigned != 0 {
shift = ">>>"
}
return c.formatExpr(`(%1s = %2e / %3e, (%1s === %1s && %1s !== 1/0 && %1s !== -1/0) ? %1s %4s 0 : $throwRuntimeError("integer divide by zero"))`, c.newVariable("_q"), e.X, e.Y, shift)
}
return c.formatExpr("%e / %e", e.X, e.Y)
case token.REM:
return c.formatExpr(`(%1s = %2e %% %3e, %1s === %1s ? %1s : $throwRuntimeError("integer divide by zero"))`, c.newVariable("_r"), e.X, e.Y)
case token.SHL, token.SHR:
op := e.Op.String()
if e.Op == token.SHR && basic.Info()&types.IsUnsigned != 0 {
op = ">>>"
}
if c.p.info.Types[e.Y].Value != nil {
return c.fixNumber(c.formatExpr("%e %s %e", e.X, op, e.Y), basic)
}
if e.Op == token.SHR && basic.Info()&types.IsUnsigned == 0 {
return c.fixNumber(c.formatParenExpr("%e >> $min(%e, 31)", e.X, e.Y), basic)
}
y := c.newVariable("y")
return c.fixNumber(c.formatExpr("(%s = %s, %s < 32 ? (%e %s %s) : 0)", y, c.translateImplicitConversion(e.Y, types.Typ[types.Uint]), y, e.X, op, y), basic)
case token.AND, token.OR:
if basic.Info()&types.IsUnsigned != 0 {
return c.formatParenExpr("(%e %t %e) >>> 0", e.X, e.Op, e.Y)
}
return c.formatParenExpr("%e %t %e", e.X, e.Op, e.Y)
case token.AND_NOT:
return c.formatParenExpr("%e & ~%e", e.X, e.Y)
case token.XOR:
return c.fixNumber(c.formatParenExpr("%e ^ %e", e.X, e.Y), basic)
default:
panic(e.Op)
}
}
switch e.Op {
case token.ADD, token.LSS, token.LEQ, token.GTR, token.GEQ:
return c.formatExpr("%e %t %e", e.X, e.Op, e.Y)
case token.LAND:
x := c.translateExpr(e.X)
y := c.translateExpr(e.Y)
if x.String() == "false" {
return c.formatExpr("false")
}
return c.formatExpr("%s && %s", x, y)
case token.LOR:
x := c.translateExpr(e.X)
y := c.translateExpr(e.Y)
if x.String() == "true" {
return c.formatExpr("true")
}
return c.formatExpr("%s || %s", x, y)
case token.EQL:
switch u := t.Underlying().(type) {
case *types.Array, *types.Struct:
return c.formatExpr("$equal(%e, %e, %s)", e.X, e.Y, c.typeName(t))
case *types.Interface:
if isJsObject(t) {
return c.formatExpr("%s === %s", c.translateImplicitConversion(e.X, t), c.translateImplicitConversion(e.Y, t))
}
return c.formatExpr("$interfaceIsEqual(%s, %s)", c.translateImplicitConversion(e.X, t), c.translateImplicitConversion(e.Y, t))
case *types.Pointer:
xUnary, xIsUnary := e.X.(*ast.UnaryExpr)
yUnary, yIsUnary := e.Y.(*ast.UnaryExpr)
if xIsUnary && xUnary.Op == token.AND && yIsUnary && yUnary.Op == token.AND {
xIndex, xIsIndex := xUnary.X.(*ast.IndexExpr)
yIndex, yIsIndex := yUnary.X.(*ast.IndexExpr)
if xIsIndex && yIsIndex {
return c.formatExpr("$sliceIsEqual(%e, %f, %e, %f)", xIndex.X, xIndex.Index, yIndex.X, yIndex.Index)
}
}
switch u.Elem().Underlying().(type) {
case *types.Struct, *types.Interface:
return c.formatExpr("%s === %s", c.translateImplicitConversion(e.X, t), c.translateImplicitConversion(e.Y, t))
case *types.Array:
return c.formatExpr("$equal(%s, %s, %s)", c.translateImplicitConversion(e.X, t), c.translateImplicitConversion(e.Y, t), c.typeName(u.Elem()))
default:
return c.formatExpr("$pointerIsEqual(%s, %s)", c.translateImplicitConversion(e.X, t), c.translateImplicitConversion(e.Y, t))
}
default:
return c.formatExpr("%s === %s", c.translateImplicitConversion(e.X, t), c.translateImplicitConversion(e.Y, t))
}
default:
panic(e.Op)
}
case *ast.ParenExpr:
x := c.translateExpr(e.X)
if x.String() == "true" || x.String() == "false" {
return x
}
return c.formatParenExpr("%s", x)
case *ast.IndexExpr:
switch t := c.p.info.Types[e.X].Type.Underlying().(type) {
case *types.Array, *types.Pointer:
if c.p.info.Types[e.Index].Value != nil {
return c.formatExpr("%e[%f]", e.X, e.Index)
}
return c.formatExpr(`((%2f < 0 || %2f >= %1e.length) ? $throwRuntimeError("index out of range") : %1e[%2f])`, e.X, e.Index)
case *types.Slice:
return c.formatExpr(`((%2f < 0 || %2f >= %1e.$length) ? $throwRuntimeError("index out of range") : %1e.$array[%1e.$offset + %2f])`, e.X, e.Index)
case *types.Map:
key := c.makeKey(e.Index, t.Key())
if _, isTuple := exprType.(*types.Tuple); isTuple {
return c.formatExpr(`(%1s = %2e[%3s], %1s !== undefined ? [%1s.v, true] : [%4s, false])`, c.newVariable("_entry"), e.X, key, c.zeroValue(t.Elem()))
}
return c.formatExpr(`(%1s = %2e[%3s], %1s !== undefined ? %1s.v : %4s)`, c.newVariable("_entry"), e.X, key, c.zeroValue(t.Elem()))
case *types.Basic:
return c.formatExpr("%e.charCodeAt(%f)", e.X, e.Index)
default:
panic(fmt.Sprintf("Unhandled IndexExpr: %T\n", t))
}
case *ast.SliceExpr:
if b, isBasic := c.p.info.Types[e.X].Type.Underlying().(*types.Basic); isBasic && b.Info()&types.IsString != 0 {
switch {
case e.Low == nil && e.High == nil:
return c.translateExpr(e.X)
case e.Low == nil:
return c.formatExpr("%e.substring(0, %f)", e.X, e.High)
case e.High == nil:
return c.formatExpr("%e.substring(%f)", e.X, e.Low)
default:
return c.formatExpr("%e.substring(%f, %f)", e.X, e.Low, e.High)
}
}
slice := c.translateConversionToSlice(e.X, exprType)
switch {
case e.Low == nil && e.High == nil:
return c.formatExpr("%s", slice)
case e.Low == nil:
if e.Max != nil {
return c.formatExpr("$subslice(%s, 0, %f, %f)", slice, e.High, e.Max)
}
return c.formatExpr("$subslice(%s, 0, %f)", slice, e.High)
case e.High == nil:
return c.formatExpr("$subslice(%s, %f)", slice, e.Low)
default:
if e.Max != nil {
return c.formatExpr("$subslice(%s, %f, %f, %f)", slice, e.Low, e.High, e.Max)
}
return c.formatExpr("$subslice(%s, %f, %f)", slice, e.Low, e.High)
}
case *ast.SelectorExpr:
sel, ok := c.p.info.Selections[e]
if !ok {
// qualified identifier
obj := c.p.info.Uses[e.Sel]
if isJsPackage(obj.Pkg()) {
switch obj.Name() {
case "Global":
return c.formatExpr("$global")
case "This":
if len(c.flattened) != 0 {
return c.formatExpr("$this")
}
return c.formatExpr("this")
case "Arguments":
args := "arguments"
if len(c.flattened) != 0 {
args = "$args"
}
return c.formatExpr(`new ($sliceType(%s.Object))($global.Array.prototype.slice.call(%s, []))`, c.p.pkgVars["github.com/gopherjs/gopherjs/js"], args)
case "Module":
return c.formatExpr("$module")
default:
panic("Invalid js package object: " + obj.Name())
}
}
return c.formatExpr("%s", c.objectName(obj))
}
parameterName := func(v *types.Var) string {
if v.Anonymous() || v.Name() == "" {
return c.newVariable("param")
}
return c.newVariable(v.Name())
}
makeParametersList := func() []string {
params := sel.Obj().Type().(*types.Signature).Params()
names := make([]string, params.Len())
for i := 0; i < params.Len(); i++ {
names[i] = parameterName(params.At(i))
}
return names
}
switch sel.Kind() {
case types.FieldVal:
fields, jsTag := c.translateSelection(sel)
if jsTag != "" {
if _, ok := sel.Type().(*types.Signature); ok {
return c.formatExpr("$internalize(%1e.%2s.%3s, %4s, %1e.%2s)", e.X, strings.Join(fields, "."), jsTag, c.typeName(sel.Type()))
}
return c.internalize(c.formatExpr("%e.%s.%s", e.X, strings.Join(fields, "."), jsTag), sel.Type())
}
return c.formatExpr("%e.%s", e.X, strings.Join(fields, "."))
case types.MethodVal:
if !sel.Obj().Exported() {
c.p.dependencies[sel.Obj()] = true
}
parameters := makeParametersList()
target := c.translateExpr(e.X)
if isWrapped(sel.Recv()) {
target = c.formatParenExpr("new %s(%s)", c.typeName(sel.Recv()), target)
}
recv := c.newVariable("_recv")
return c.formatExpr("(%s = %s, function(%s) { $stackDepthOffset--; try { return %s.%s(%s); } finally { $stackDepthOffset++; } })", recv, target, strings.Join(parameters, ", "), recv, e.Sel.Name, strings.Join(parameters, ", "))
case types.MethodExpr:
if !sel.Obj().Exported() {
c.p.dependencies[sel.Obj()] = true
}
recv := "recv"
if isWrapped(sel.Recv()) {
recv = fmt.Sprintf("(new %s(recv))", c.typeName(sel.Recv()))
}
parameters := makeParametersList()
return c.formatExpr("(function(%s) { $stackDepthOffset--; try { return %s.%s(%s); } finally { $stackDepthOffset++; } })", strings.Join(append([]string{"recv"}, parameters...), ", "), recv, sel.Obj().(*types.Func).Name(), strings.Join(parameters, ", "))
}
panic("")
case *ast.CallExpr:
plainFun := e.Fun
for {
if p, isParen := plainFun.(*ast.ParenExpr); isParen {
plainFun = p.X
continue
}
break
}
var isType func(ast.Expr) bool
isType = func(expr ast.Expr) bool {
switch e := expr.(type) {
case *ast.ArrayType, *ast.ChanType, *ast.FuncType, *ast.InterfaceType, *ast.MapType, *ast.StructType:
return true
case *ast.StarExpr:
return isType(e.X)
case *ast.Ident:
_, ok := c.p.info.Uses[e].(*types.TypeName)
return ok
case *ast.SelectorExpr:
_, ok := c.p.info.Uses[e.Sel].(*types.TypeName)
return ok
case *ast.ParenExpr:
return isType(e.X)
default:
return false
}
}
if isType(plainFun) {
return c.formatExpr("%s", c.translateConversion(e.Args[0], c.p.info.Types[plainFun].Type))
}
var fun *expression
switch f := plainFun.(type) {
case *ast.Ident:
if o, ok := c.p.info.Uses[f].(*types.Builtin); ok {
return c.translateBuiltin(o.Name(), e.Args, e.Ellipsis.IsValid(), exprType)
}
fun = c.translateExpr(plainFun)
case *ast.SelectorExpr:
sel, ok := c.p.info.Selections[f]
if !ok {
// qualified identifier
obj := c.p.info.Uses[f.Sel]
if isJsPackage(obj.Pkg()) {
switch obj.Name() {
case "InternalObject":
return c.translateExpr(e.Args[0])
}
}
fun = c.translateExpr(f)
break
}
externalizeExpr := func(e ast.Expr) string {
t := c.p.info.Types[e].Type
if types.Identical(t, types.Typ[types.UntypedNil]) {
return "null"
}
return c.externalize(c.translateExpr(e).String(), t)
}
externalizeArgs := func(args []ast.Expr) string {
s := make([]string, len(args))
for i, arg := range args {
s[i] = externalizeExpr(arg)
}
return strings.Join(s, ", ")
}
switch sel.Kind() {
case types.MethodVal:
if !sel.Obj().Exported() {
c.p.dependencies[sel.Obj()] = true
}
methodName := sel.Obj().Name()
if reservedKeywords[methodName] {
methodName += "$"
}
recvType := sel.Recv()
_, isPointer := recvType.Underlying().(*types.Pointer)
methodsRecvType := sel.Obj().Type().(*types.Signature).Recv().Type()
_, pointerExpected := methodsRecvType.(*types.Pointer)
var recv *expression
switch {
case !isPointer && pointerExpected:
recv = c.translateExpr(c.setType(&ast.UnaryExpr{Op: token.AND, X: f.X}, methodsRecvType))
default:
recv = c.translateExpr(f.X)
}
for _, index := range sel.Index()[:len(sel.Index())-1] {
if ptr, isPtr := recvType.(*types.Pointer); isPtr {
recvType = ptr.Elem()
}
s := recvType.Underlying().(*types.Struct)
recv = c.formatExpr("%s.%s", recv, fieldName(s, index))
recvType = s.Field(index).Type()
}
if isJsPackage(sel.Obj().Pkg()) {
globalRef := func(id string) string {
if recv.String() == "$global" && id[0] == '$' {
return id
}
return recv.String() + "." + id
}
switch sel.Obj().Name() {
case "Get":
if id, ok := c.identifierConstant(e.Args[0]); ok {
return c.formatExpr("%s", globalRef(id))
}
return c.formatExpr("%s[$externalize(%e, $String)]", recv, e.Args[0])
case "Set":
if id, ok := c.identifierConstant(e.Args[0]); ok {
return c.formatExpr("%s = %s", globalRef(id), externalizeExpr(e.Args[1]))
}
return c.formatExpr("%s[$externalize(%e, $String)] = %s", recv, e.Args[0], externalizeExpr(e.Args[1]))
case "Delete":
return c.formatExpr("delete %s[$externalize(%e, $String)]", recv, e.Args[0])
case "Length":
return c.formatExpr("$parseInt(%s.length)", recv)
case "Index":
return c.formatExpr("%s[%e]", recv, e.Args[0])
case "SetIndex":
return c.formatExpr("%s[%e] = %s", recv, e.Args[0], externalizeExpr(e.Args[1]))
case "Call":
if id, ok := c.identifierConstant(e.Args[0]); ok {
if e.Ellipsis.IsValid() {
objVar := c.newVariable("obj")
return c.formatExpr("(%s = %s, %s.%s.apply(%s, %s))", objVar, recv, objVar, id, objVar, externalizeExpr(e.Args[1]))
}
return c.formatExpr("%s(%s)", globalRef(id), externalizeArgs(e.Args[1:]))
}
if e.Ellipsis.IsValid() {
objVar := c.newVariable("obj")
return c.formatExpr("(%s = %s, %s[$externalize(%e, $String)].apply(%s, %s))", objVar, recv, objVar, e.Args[0], objVar, externalizeExpr(e.Args[1]))
}
return c.formatExpr("%s[$externalize(%e, $String)](%s)", recv, e.Args[0], externalizeArgs(e.Args[1:]))
case "Invoke":
if e.Ellipsis.IsValid() {
return c.formatExpr("%s.apply(undefined, %s)", recv, externalizeExpr(e.Args[0]))
}
return c.formatExpr("%s(%s)", recv, externalizeArgs(e.Args))
case "New":
if e.Ellipsis.IsValid() {
return c.formatExpr("new ($global.Function.prototype.bind.apply(%s, [undefined].concat(%s)))", recv, externalizeExpr(e.Args[0]))
}
return c.formatExpr("new (%s)(%s)", recv, externalizeArgs(e.Args))
case "Bool":
return c.internalize(recv, types.Typ[types.Bool])
case "Str":
return c.internalize(recv, types.Typ[types.String])
case "Int":
return c.internalize(recv, types.Typ[types.Int])
case "Int64":
return c.internalize(recv, types.Typ[types.Int64])
case "Uint64":
return c.internalize(recv, types.Typ[types.Uint64])
case "Float":
return c.internalize(recv, types.Typ[types.Float64])
case "Interface":
return c.internalize(recv, types.NewInterface(nil, nil))
case "Unsafe":
return recv
case "IsUndefined":
return c.formatParenExpr("%s === undefined", recv)
case "IsNull":
return c.formatParenExpr("%s === null", recv)
default:
panic("Invalid js package object: " + sel.Obj().Name())
}
}
if isWrapped(methodsRecvType) {
fun = c.formatExpr("(new %s(%s)).%s", c.typeName(methodsRecvType), recv, methodName)
break
}
fun = c.formatExpr("%s.%s", recv, methodName)
case types.FieldVal:
fields, jsTag := c.translateSelection(sel)
if jsTag != "" {
sig := sel.Type().(*types.Signature)
return c.internalize(c.formatExpr("%e.%s.%s(%s)", f.X, strings.Join(fields, "."), jsTag, externalizeArgs(e.Args)), sig.Results().At(0).Type())
}
fun = c.formatExpr("%e.%s", f.X, strings.Join(fields, "."))
case types.MethodExpr:
fun = c.translateExpr(f)
default:
panic("")
}
default:
fun = c.translateExpr(plainFun)
}
sig := c.p.info.Types[plainFun].Type.Underlying().(*types.Signature)
if len(e.Args) == 1 {
if tuple, isTuple := c.p.info.Types[e.Args[0]].Type.(*types.Tuple); isTuple {
tupleVar := c.newVariable("_tuple")
args := make([]ast.Expr, tuple.Len())
for i := range args {
args[i] = c.newIdent(c.formatExpr("%s[%d]", tupleVar, i).String(), tuple.At(i).Type())
}
return c.formatExpr("(%s = %e, %s(%s))", tupleVar, e.Args[0], fun, strings.Join(c.translateArgs(sig, args, false), ", "))
}
}
args := c.translateArgs(sig, e.Args, e.Ellipsis.IsValid())
if c.blocking[e] {
resumeCase := c.caseCounter
c.caseCounter++
returnVar := "$r"
if sig.Results().Len() != 0 {
returnVar = c.newVariable("_r")
}
c.Printf("%[1]s = %[2]s(%[3]s); /* */ $s = %[4]d; case %[4]d: if (%[1]s && %[1]s.constructor === Function) { %[1]s = %[1]s(); }", returnVar, fun, strings.Join(append(args, "true"), ", "), resumeCase)
if sig.Results().Len() != 0 {
return c.formatExpr("%s", returnVar)
}
return nil
}
return c.formatExpr("%s(%s)", fun, strings.Join(args, ", "))
case *ast.StarExpr:
if c1, isCall := e.X.(*ast.CallExpr); isCall && len(c1.Args) == 1 {
if c2, isCall := c1.Args[0].(*ast.CallExpr); isCall && len(c2.Args) == 1 && types.Identical(c.p.info.Types[c2.Fun].Type, types.Typ[types.UnsafePointer]) {
if unary, isUnary := c2.Args[0].(*ast.UnaryExpr); isUnary && unary.Op == token.AND {
return c.translateExpr(unary.X) // unsafe conversion
}
}
}
switch exprType.Underlying().(type) {
case *types.Struct, *types.Array:
return c.translateExpr(e.X)
}
return c.formatExpr("%e.$get()", e.X)
case *ast.TypeAssertExpr:
if e.Type == nil {
return c.translateExpr(e.X)
}
t := c.p.info.Types[e.Type].Type
check := "%1e !== null && " + c.typeCheck("%1e.constructor", t)
valueSuffix := ""
if _, isInterface := t.Underlying().(*types.Interface); !isInterface {
valueSuffix = ".$val"
}
if _, isTuple := exprType.(*types.Tuple); isTuple {
return c.formatExpr("("+check+" ? [%1e%2s, true] : [%3s, false])", e.X, valueSuffix, c.zeroValue(c.p.info.Types[e.Type].Type))
}
return c.formatExpr("("+check+" ? %1e%2s : $typeAssertionFailed(%1e, %3s))", e.X, valueSuffix, c.typeName(t))
case *ast.Ident:
if e.Name == "_" {
panic("Tried to translate underscore identifier.")
}
obj := c.p.info.Defs[e]
if obj == nil {
obj = c.p.info.Uses[e]
}
switch o := obj.(type) {
case *types.PkgName:
return c.formatExpr("%s", c.p.pkgVars[o.Pkg().Path()])
case *types.Var, *types.Const:
return c.formatExpr("%s", c.objectName(o))
case *types.Func:
return c.formatExpr("%s", c.objectName(o))
case *types.TypeName:
return c.formatExpr("%s", c.typeName(o.Type()))
case *types.Nil:
return c.formatExpr("%s", c.zeroValue(c.p.info.Types[e].Type))
default:
panic(fmt.Sprintf("Unhandled object: %T\n", o))
}
case *This:
this := "this"
if len(c.flattened) != 0 {
this = "$this"
}
if isWrapped(c.p.info.Types[e].Type) {
this += ".$val"
}
return c.formatExpr(this)
case nil:
return c.formatExpr("")
default:
panic(fmt.Sprintf("Unhandled expression: %T\n", e))
}
}
func (c *funcContext) formatExprInternal(format string, a []interface{}, parens bool) *expression {
processFormat := func(f func(uint8, uint8, int)) {
n := 0
for i := 0; i < len(format); i++ {
b := format[i]
if b == '%' {
i++
k := format[i]
if k >= '0' && k <= '9' {
n = int(k - '0' - 1)
i++
k = format[i]
}
f(0, k, n)
n++
continue
}
f(b, 0, 0)
}
}
counts := make([]int, len(a))
processFormat(func(b, k uint8, n int) {
switch k {
case 'e', 'f', 'h', 'l', 'r', 'i':
counts[n]++
}
})
out := bytes.NewBuffer(nil)
vars := make([]string, len(a))
hasAssignments := false
for i, e := range a {
if counts[i] <= 1 {
continue
}
if _, isIdent := e.(*ast.Ident); isIdent {
continue
}
if val := c.p.info.Types[e.(ast.Expr)].Value; val != nil {
continue
}
if !hasAssignments {
hasAssignments = true
out.WriteByte('(')
parens = false
}
v := c.newVariable("x")
out.WriteString(v + " = " + c.translateExpr(e.(ast.Expr)).String() + ", ")
vars[i] = v
}
processFormat(func(b, k uint8, n int) {
writeExpr := func(suffix string) {
if vars[n] != "" {
out.WriteString(vars[n] + suffix)
return
}
out.WriteString(c.translateExpr(a[n].(ast.Expr)).StringWithParens() + suffix)
}
switch k {
case 0:
out.WriteByte(b)
case 's':
if e, ok := a[n].(*expression); ok {
out.WriteString(e.StringWithParens())
return
}
out.WriteString(a[n].(string))
case 'd':
out.WriteString(strconv.Itoa(a[n].(int)))
case 't':
out.WriteString(a[n].(token.Token).String())
case 'e':
e := a[n].(ast.Expr)
if val := c.p.info.Types[e].Value; val != nil {
out.WriteString(c.translateExpr(e).String())
return
}
writeExpr("")
case 'f':
e := a[n].(ast.Expr)
if val := c.p.info.Types[e].Value; val != nil {
d, _ := exact.Int64Val(val)
out.WriteString(strconv.FormatInt(d, 10))
return
}
if is64Bit(c.p.info.Types[e].Type.Underlying().(*types.Basic)) {
out.WriteString("$flatten64(")
writeExpr("")
out.WriteString(")")
return
}
writeExpr("")
case 'h':
e := a[n].(ast.Expr)
if val := c.p.info.Types[e].Value; val != nil {
d, _ := exact.Uint64Val(val)
if c.p.info.Types[e].Type.Underlying().(*types.Basic).Kind() == types.Int64 {
out.WriteString(strconv.FormatInt(int64(d)>>32, 10))
return
}
out.WriteString(strconv.FormatUint(d>>32, 10))
return
}
writeExpr(".$high")
case 'l':
if val := c.p.info.Types[a[n].(ast.Expr)].Value; val != nil {
d, _ := exact.Uint64Val(val)
out.WriteString(strconv.FormatUint(d&(1<<32-1), 10))
return
}
writeExpr(".$low")
case 'r':
if val := c.p.info.Types[a[n].(ast.Expr)].Value; val != nil {
r, _ := exact.Float64Val(exact.Real(val))
out.WriteString(strconv.FormatFloat(r, 'g', -1, 64))
return
}
writeExpr(".$real")
case 'i':
if val := c.p.info.Types[a[n].(ast.Expr)].Value; val != nil {
i, _ := exact.Float64Val(exact.Imag(val))
out.WriteString(strconv.FormatFloat(i, 'g', -1, 64))
return
}
writeExpr(".$imag")
case '%':
out.WriteRune('%')
default:
panic(fmt.Sprintf("formatExpr: %%%c%d", k, n))
}
})
if hasAssignments {
out.WriteByte(')')
}
return &expression{str: out.String(), parens: parens}
}
func (c *PkgContext) translateExpr(expr ast.Expr) string {
exprType := c.info.Types[expr]
if value, valueFound := c.info.Values[expr]; valueFound {
basic := types.Typ[types.String]
if value.Kind() != exact.String { // workaround for bug in go/types
basic = exprType.Underlying().(*types.Basic)
}
switch {
case basic.Info()&types.IsBoolean != 0:
return strconv.FormatBool(exact.BoolVal(value))
case basic.Info()&types.IsInteger != 0:
if is64Bit(basic) {
d, _ := exact.Uint64Val(value)
return fmt.Sprintf("new %s(%d, %d)", c.typeName(exprType), d>>32, d&(1<<32-1))
}
d, _ := exact.Int64Val(value)
return strconv.FormatInt(d, 10)
case basic.Info()&types.IsFloat != 0:
f, _ := exact.Float64Val(value)
return strconv.FormatFloat(f, 'g', -1, 64)
case basic.Info()&types.IsComplex != 0:
r, _ := exact.Float64Val(exact.Real(value))
i, _ := exact.Float64Val(exact.Imag(value))
if basic.Kind() == types.UntypedComplex {
exprType = types.Typ[types.Complex128]
}
return fmt.Sprintf("new %s(%s, %s)", c.typeName(exprType), strconv.FormatFloat(r, 'g', -1, 64), strconv.FormatFloat(i, 'g', -1, 64))
case basic.Info()&types.IsString != 0:
buffer := bytes.NewBuffer(nil)
for _, r := range []byte(exact.StringVal(value)) {
switch r {
case '\b':
buffer.WriteString(`\b`)
case '\f':
buffer.WriteString(`\f`)
case '\n':
buffer.WriteString(`\n`)
case '\r':
buffer.WriteString(`\r`)
case '\t':
buffer.WriteString(`\t`)
case '\v':
buffer.WriteString(`\v`)
case '"':
buffer.WriteString(`\"`)
case '\\':
buffer.WriteString(`\\`)
default:
if r < 0x20 || r > 0x7E {
fmt.Fprintf(buffer, `\x%02X`, r)
continue
}
buffer.WriteByte(r)
}
}
return `"` + buffer.String() + `"`
default:
panic("Unhandled constant type: " + basic.String())
}
}
switch e := expr.(type) {
case *ast.CompositeLit:
if ptrType, isPointer := exprType.(*types.Pointer); isPointer {
exprType = ptrType.Elem()
}
collectIndexedElements := func(elementType types.Type) []string {
elements := make([]string, 0)
i := 0
zero := c.zeroValue(elementType)
for _, element := range e.Elts {
if kve, isKve := element.(*ast.KeyValueExpr); isKve {
key, _ := exact.Int64Val(c.info.Values[kve.Key])
i = int(key)
element = kve.Value
}
for len(elements) <= i {
elements = append(elements, zero)
}
elements[i] = c.translateExprToType(element, elementType)
i++
}
return elements
}
switch t := exprType.Underlying().(type) {
case *types.Array:
elements := collectIndexedElements(t.Elem())
if len(elements) != 0 {
zero := c.zeroValue(t.Elem())
for len(elements) < int(t.Len()) {
elements = append(elements, zero)
}
return createListComposite(t.Elem(), elements)
}
return fmt.Sprintf("Go$makeArray(%s, %d, function() { return %s; })", toArrayType(t.Elem()), t.Len(), c.zeroValue(t.Elem()))
case *types.Slice:
return fmt.Sprintf("new %s(%s)", c.typeName(exprType), createListComposite(t.Elem(), collectIndexedElements(t.Elem())))
case *types.Map:
elements := make([]string, len(e.Elts)*2)
for i, element := range e.Elts {
kve := element.(*ast.KeyValueExpr)
elements[i*2] = c.translateExprToType(kve.Key, t.Key())
elements[i*2+1] = c.translateExprToType(kve.Value, t.Elem())
}
return fmt.Sprintf("new %s([%s])", c.typeName(exprType), strings.Join(elements, ", "))
case *types.Struct:
elements := make([]string, t.NumFields())
isKeyValue := true
if len(e.Elts) != 0 {
_, isKeyValue = e.Elts[0].(*ast.KeyValueExpr)
}
if !isKeyValue {
for i, element := range e.Elts {
elements[i] = c.translateExprToType(element, t.Field(i).Type())
}
}
if isKeyValue {
for i := range elements {
elements[i] = c.zeroValue(t.Field(i).Type())
}
for _, element := range e.Elts {
kve := element.(*ast.KeyValueExpr)
for j := range elements {
if kve.Key.(*ast.Ident).Name == t.Field(j).Name() {
elements[j] = c.translateExprToType(kve.Value, t.Field(j).Type())
break
}
}
}
}
if named, isNamed := exprType.(*types.Named); isNamed {
return fmt.Sprintf("new %s(%s)", c.objectName(named.Obj()), strings.Join(elements, ", "))
}
structVar := c.newVariable("_struct")
c.translateTypeSpec(&ast.TypeSpec{
Name: c.newIdent(structVar, t),
Type: e.Type,
})
return fmt.Sprintf("new %s(%s)", structVar, strings.Join(elements, ", "))
default:
panic(fmt.Sprintf("Unhandled CompositeLit type: %T\n", t))
}
case *ast.FuncLit:
return strings.TrimSpace(string(c.CatchOutput(func() {
c.newScope(func() {
params := c.translateParams(e.Type)
closurePrefix := "("
closureSuffix := ")"
if len(c.escapingVars) != 0 {
list := strings.Join(c.escapingVars, ", ")
closurePrefix = "(function(" + list + ") { return "
closureSuffix = "; })(" + list + ")"
}
c.Printf("%sfunction(%s) {", closurePrefix, strings.Join(params, ", "))
c.Indent(func() {
c.translateFunctionBody(e.Body.List, exprType.(*types.Signature))
})
c.Printf("}%s", closureSuffix)
})
})))
case *ast.UnaryExpr:
switch e.Op {
case token.AND:
switch c.info.Types[e.X].Underlying().(type) {
case *types.Struct, *types.Array:
return c.translateExpr(e.X)
default:
if _, isComposite := e.X.(*ast.CompositeLit); isComposite {
return fmt.Sprintf("Go$newDataPointer(%s, %s)", c.translateExpr(e.X), c.typeName(c.info.Types[e]))
}
closurePrefix := ""
closureSuffix := ""
if len(c.escapingVars) != 0 {
list := strings.Join(c.escapingVars, ", ")
closurePrefix = "(function(" + list + ") { return "
closureSuffix = "; })(" + list + ")"
}
vVar := c.newVariable("v")
return fmt.Sprintf("%snew %s(function() { return %s; }, function(%s) { %s; })%s", closurePrefix, c.typeName(exprType), c.translateExpr(e.X), vVar, c.translateAssign(e.X, vVar), closureSuffix)
}
case token.ARROW:
return "undefined"
}
t := c.info.Types[e.X]
basic := t.Underlying().(*types.Basic)
op := e.Op.String()
switch e.Op {
case token.ADD:
return c.translateExpr(e.X)
case token.SUB:
if is64Bit(basic) {
x := c.newVariable("x")
return fmt.Sprintf("(%s = %s, new %s(-%s.high, -%s.low))", x, c.translateExpr(e.X), c.typeName(t), x, x)
}
if basic.Info()&types.IsComplex != 0 {
x := c.newVariable("x")
return fmt.Sprintf("(%s = %s, new %s(-%s.real, -%s.imag))", x, c.translateExpr(e.X), c.typeName(t), x, x)
}
case token.XOR:
if is64Bit(basic) {
x := c.newVariable("x")
return fmt.Sprintf("(%s = %s, new %s(~%s.high, ~%s.low >>> 0))", x, c.translateExpr(e.X), c.typeName(t), x, x)
}
op = "~"
}
return fixNumber(fmt.Sprintf("%s%s", op, c.translateExpr(e.X)), basic)
case *ast.BinaryExpr:
if e.Op == token.NEQ {
return fmt.Sprintf("!(%s)", c.translateExpr(&ast.BinaryExpr{
X: e.X,
Op: token.EQL,
Y: e.Y,
}))
}
t := c.info.Types[e.X]
t2 := c.info.Types[e.Y]
_, isInterface := t2.Underlying().(*types.Interface)
if isInterface {
t = t2
}
if basic, isBasic := t.Underlying().(*types.Basic); isBasic && basic.Info()&types.IsNumeric != 0 {
if is64Bit(basic) {
var expr string
switch e.Op {
case token.MUL:
return fmt.Sprintf("Go$mul64(%s, %s)", c.translateExpr(e.X), c.translateExpr(e.Y))
case token.QUO:
return fmt.Sprintf("Go$div64(%s, %s, false)", c.translateExpr(e.X), c.translateExpr(e.Y))
case token.REM:
return fmt.Sprintf("Go$div64(%s, %s, true)", c.translateExpr(e.X), c.translateExpr(e.Y))
case token.SHL:
return fmt.Sprintf("Go$shiftLeft64(%s, %s)", c.translateExpr(e.X), c.flatten64(e.Y))
case token.SHR:
return fmt.Sprintf("Go$shiftRight%s(%s, %s)", toJavaScriptType(basic), c.translateExpr(e.X), c.flatten64(e.Y))
case token.EQL:
expr = "x.high === y.high && x.low === y.low"
case token.LSS:
expr = "x.high < y.high || (x.high === y.high && x.low < y.low)"
case token.LEQ:
expr = "x.high < y.high || (x.high === y.high && x.low <= y.low)"
case token.GTR:
expr = "x.high > y.high || (x.high === y.high && x.low > y.low)"
case token.GEQ:
expr = "x.high > y.high || (x.high === y.high && x.low >= y.low)"
case token.ADD, token.SUB:
expr = fmt.Sprintf("new %s(x.high %s y.high, x.low %s y.low)", c.typeName(t), e.Op, e.Op)
case token.AND, token.OR, token.XOR:
expr = fmt.Sprintf("new %s(x.high %s y.high, (x.low %s y.low) >>> 0)", c.typeName(t), e.Op, e.Op)
case token.AND_NOT:
expr = fmt.Sprintf("new %s(x.high &~ y.high, (x.low &~ y.low) >>> 0)", c.typeName(t))
default:
panic(e.Op)
}
x := c.newVariable("x")
y := c.newVariable("y")
expr = strings.Replace(expr, "x.", x+".", -1)
expr = strings.Replace(expr, "y.", y+".", -1)
return fmt.Sprintf("(%s = %s, %s = %s, %s)", x, c.translateExpr(e.X), y, c.translateExpr(e.Y), expr)
}
if basic.Info()&types.IsComplex != 0 {
var expr string
switch e.Op {
case token.EQL:
expr = "x.real === y.real && x.imag === y.imag"
case token.ADD, token.SUB:
expr = fmt.Sprintf("new %s(x.real %s y.real, x.imag %s y.imag)", c.typeName(t), e.Op, e.Op)
case token.MUL:
expr = fmt.Sprintf("new %s(x.real * y.real - x.imag * y.imag, x.real * y.imag + x.imag * y.real)", c.typeName(t))
case token.QUO:
return fmt.Sprintf("Go$divComplex(%s, %s)", c.translateExpr(e.X), c.translateExpr(e.Y))
default:
panic(e.Op)
}
x := c.newVariable("x")
y := c.newVariable("y")
expr = strings.Replace(expr, "x.", x+".", -1)
expr = strings.Replace(expr, "y.", y+".", -1)
return fmt.Sprintf("(%s = %s, %s = %s, %s)", x, c.translateExpr(e.X), y, c.translateExpr(e.Y), expr)
}
switch e.Op {
case token.EQL:
return fmt.Sprintf("%s === %s", c.translateExpr(e.X), c.translateExpr(e.Y))
case token.LSS, token.LEQ, token.GTR, token.GEQ:
return fmt.Sprintf("%s %s %s", c.translateExpr(e.X), e.Op, c.translateExpr(e.Y))
case token.ADD, token.SUB:
return fixNumber(fmt.Sprintf("%s %s %s", c.translateExpr(e.X), e.Op, c.translateExpr(e.Y)), basic)
case token.MUL:
if basic.Kind() == types.Int32 {
x := c.newVariable("x")
y := c.newVariable("y")
return fmt.Sprintf("(%s = %s, %s = %s, (((%s >>> 16 << 16) * %s >> 0) + (%s << 16 >>> 16) * %s) >> 0)", x, c.translateExpr(e.X), y, c.translateExpr(e.Y), x, y, x, y)
}
if basic.Kind() == types.Uint32 || basic.Kind() == types.Uintptr {
x := c.newVariable("x")
y := c.newVariable("y")
return fmt.Sprintf("(%s = %s, %s = %s, (((%s >>> 16 << 16) * %s >>> 0) + (%s << 16 >>> 16) * %s) >>> 0)", x, c.translateExpr(e.X), y, c.translateExpr(e.Y), x, y, x, y)
}
return fixNumber(fmt.Sprintf("%s * %s", c.translateExpr(e.X), c.translateExpr(e.Y)), basic)
case token.QUO:
value := fmt.Sprintf("%s / %s", c.translateExpr(e.X), c.translateExpr(e.Y))
if basic.Info()&types.IsInteger != 0 {
value = "(Go$obj = " + value + `, (Go$obj === Go$obj && Go$obj !== 1/0 && Go$obj !== -1/0) ? Go$obj : Go$throwRuntimeError("integer divide by zero"))`
}
switch basic.Kind() {
case types.Int, types.Uint:
return "(" + value + " >> 0)" // cut off decimals
default:
return fixNumber(value, basic)
}
case token.REM:
return fmt.Sprintf(`(Go$obj = %s %% %s, Go$obj === Go$obj ? Go$obj : Go$throwRuntimeError("integer divide by zero"))`, c.translateExpr(e.X), c.translateExpr(e.Y))
case token.SHL, token.SHR:
op := e.Op.String()
if e.Op == token.SHR && basic.Info()&types.IsUnsigned != 0 {
op = ">>>"
}
if c.info.Values[e.Y] != nil {
return fixNumber(fmt.Sprintf("%s %s %s", c.translateExpr(e.X), op, c.translateExpr(e.Y)), basic)
}
if e.Op == token.SHR && basic.Info()&types.IsUnsigned == 0 {
return fixNumber(fmt.Sprintf("(%s >> Go$min(%s, 31))", c.translateExpr(e.X), c.translateExpr(e.Y)), basic)
}
y := c.newVariable("y")
return fixNumber(fmt.Sprintf("(%s = %s, %s < 32 ? (%s %s %s) : 0)", y, c.translateExprToType(e.Y, types.Typ[types.Uint]), y, c.translateExpr(e.X), op, y), basic)
case token.AND, token.OR, token.XOR:
return fixNumber(fmt.Sprintf("(%s %s %s)", c.translateExpr(e.X), e.Op, c.translateExpr(e.Y)), basic)
case token.AND_NOT:
return fixNumber(fmt.Sprintf("(%s &~ %s)", c.translateExpr(e.X), c.translateExpr(e.Y)), basic)
default:
panic(e.Op)
}
}
switch e.Op {
case token.ADD, token.LSS, token.LEQ, token.GTR, token.GEQ, token.LAND, token.LOR:
return fmt.Sprintf("%s %s %s", c.translateExpr(e.X), e.Op, c.translateExpr(e.Y))
case token.EQL:
switch u := t.Underlying().(type) {
case *types.Struct:
x := c.newVariable("x")
y := c.newVariable("y")
var conds []string
for i := 0; i < u.NumFields(); i++ {
field := u.Field(i)
if field.Name() == "_" {
continue
}
conds = append(conds, c.translateExpr(&ast.BinaryExpr{
X: c.newIdent(x+"."+field.Name(), field.Type()),
Op: token.EQL,
Y: c.newIdent(y+"."+field.Name(), field.Type()),
}))
}
if len(conds) == 0 {
conds = []string{"true"}
}
return fmt.Sprintf("(%s = %s, %s = %s, %s)", x, c.translateExpr(e.X), y, c.translateExpr(e.Y), strings.Join(conds, " && "))
case *types.Interface:
return fmt.Sprintf("Go$interfaceIsEqual(%s, %s)", c.translateExprToType(e.X, t), c.translateExprToType(e.Y, t))
case *types.Array:
return fmt.Sprintf("Go$arrayIsEqual(%s, %s)", c.translateExpr(e.X), c.translateExpr(e.Y))
case *types.Pointer:
xUnary, xIsUnary := e.X.(*ast.UnaryExpr)
yUnary, yIsUnary := e.Y.(*ast.UnaryExpr)
if xIsUnary && xUnary.Op == token.AND && yIsUnary && yUnary.Op == token.AND {
xIndex, xIsIndex := xUnary.X.(*ast.IndexExpr)
yIndex, yIsIndex := yUnary.X.(*ast.IndexExpr)
if xIsIndex && yIsIndex {
return fmt.Sprintf("Go$sliceIsEqual(%s, %s, %s, %s)", c.translateExpr(xIndex.X), c.flatten64(xIndex.Index), c.translateExpr(yIndex.X), c.flatten64(yIndex.Index))
}
}
switch u.Elem().Underlying().(type) {
case *types.Struct, *types.Interface:
return c.translateExprToType(e.X, t) + " === " + c.translateExprToType(e.Y, t)
case *types.Array:
return fmt.Sprintf("Go$arrayIsEqual(%s, %s)", c.translateExprToType(e.X, t), c.translateExprToType(e.Y, t))
default:
return fmt.Sprintf("Go$pointerIsEqual(%s, %s)", c.translateExprToType(e.X, t), c.translateExprToType(e.Y, t))
}
default:
return c.translateExprToType(e.X, t) + " === " + c.translateExprToType(e.Y, t)
}
default:
panic(e.Op)
}
case *ast.ParenExpr:
return fmt.Sprintf("(%s)", c.translateExpr(e.X))
case *ast.IndexExpr:
xType := c.info.Types[e.X]
if ptr, isPointer := xType.(*types.Pointer); isPointer {
xType = ptr.Elem()
}
switch t := xType.Underlying().(type) {
case *types.Array:
return fmt.Sprintf("%s[%s]", c.translateExpr(e.X), c.flatten64(e.Index))
case *types.Slice:
sliceVar := c.newVariable("_slice")
indexVar := c.newVariable("_index")
return fmt.Sprintf(`(%s = %s, %s = %s, (%s >= 0 && %s < %s.length) ? %s.array[%s.offset + %s] : Go$throwRuntimeError("index out of range"))`, sliceVar, c.translateExpr(e.X), indexVar, c.flatten64(e.Index), indexVar, indexVar, sliceVar, sliceVar, sliceVar, indexVar)
case *types.Map:
key := c.makeKey(e.Index, t.Key())
if _, isTuple := exprType.(*types.Tuple); isTuple {
return fmt.Sprintf(`(Go$obj = (%s || false)[%s], Go$obj !== undefined ? [Go$obj.v, true] : [%s, false])`, c.translateExpr(e.X), key, c.zeroValue(t.Elem()))
}
return fmt.Sprintf(`(Go$obj = (%s || false)[%s], Go$obj !== undefined ? Go$obj.v : %s)`, c.translateExpr(e.X), key, c.zeroValue(t.Elem()))
case *types.Basic:
return fmt.Sprintf("%s.charCodeAt(%s)", c.translateExpr(e.X), c.flatten64(e.Index))
default:
panic(fmt.Sprintf("Unhandled IndexExpr: %T\n", t))
}
case *ast.SliceExpr:
b, isBasic := c.info.Types[e.X].(*types.Basic)
isString := isBasic && b.Info()&types.IsString != 0
slice := c.translateExprToType(e.X, exprType)
if e.High == nil {
if e.Low == nil {
return slice
}
if isString {
return fmt.Sprintf("%s.substring(%s)", slice, c.flatten64(e.Low))
}
return fmt.Sprintf("Go$subslice(%s, %s)", slice, c.flatten64(e.Low))
}
low := "0"
if e.Low != nil {
low = c.flatten64(e.Low)
}
if isString {
return fmt.Sprintf("%s.substring(%s, %s)", slice, low, c.flatten64(e.High))
}
if e.Max != nil {
return fmt.Sprintf("Go$subslice(%s, %s, %s, %s)", slice, low, c.flatten64(e.High), c.flatten64(e.Max))
}
return fmt.Sprintf("Go$subslice(%s, %s, %s)", slice, low, c.flatten64(e.High))
case *ast.SelectorExpr:
sel := c.info.Selections[e]
parameterName := func(v *types.Var) string {
if v.Anonymous() || v.Name() == "" {
return c.newVariable("param")
}
return c.newVariable(v.Name())
}
makeParametersList := func() []string {
params := sel.Obj().Type().(*types.Signature).Params()
names := make([]string, params.Len())
for i := 0; i < params.Len(); i++ {
names[i] = parameterName(params.At(i))
}
return names
}
switch sel.Kind() {
case types.FieldVal:
return c.translateExpr(e.X) + "." + translateSelection(sel)
case types.MethodVal:
parameters := makeParametersList()
recv := c.newVariable("_recv")
return fmt.Sprintf("(%s = %s, function(%s) { return %s.%s(%s); })", recv, c.translateExpr(e.X), strings.Join(parameters, ", "), recv, e.Sel.Name, strings.Join(parameters, ", "))
case types.MethodExpr:
recv := "recv"
if isWrapped(sel.Recv()) {
recv = fmt.Sprintf("(new %s(recv))", c.typeName(sel.Recv()))
}
parameters := makeParametersList()
return fmt.Sprintf("(function(%s) { return %s.%s(%s); })", strings.Join(append([]string{"recv"}, parameters...), ", "), recv, sel.Obj().(*types.Func).Name(), strings.Join(parameters, ", "))
case types.PackageObj:
return fmt.Sprintf("%s.%s", c.translateExpr(e.X), e.Sel.Name)
}
panic("")
case *ast.CallExpr:
plainFun := e.Fun
for {
if p, isParen := plainFun.(*ast.ParenExpr); isParen {
plainFun = p.X
continue
}
break
}
switch f := plainFun.(type) {
case *ast.Ident:
switch o := c.info.Objects[f].(type) {
case *types.Builtin:
switch o.Name() {
case "new":
t := c.info.Types[e].(*types.Pointer)
if types.IsIdentical(t.Elem().Underlying(), types.Typ[types.Uintptr]) {
return "new Uint8Array(8)"
}
switch t.Elem().Underlying().(type) {
case *types.Struct, *types.Array:
return c.zeroValue(t.Elem())
default:
return fmt.Sprintf("Go$newDataPointer(%s, %s)", c.zeroValue(t.Elem()), c.typeName(t))
}
case "make":
switch t2 := c.info.Types[e.Args[0]].Underlying().(type) {
case *types.Slice:
if len(e.Args) == 3 {
return fmt.Sprintf("Go$subslice(new %s(Go$makeArray(%s, %s, function() { return %s; })), 0, %s)", c.typeName(c.info.Types[e.Args[0]]), toArrayType(t2.Elem()), c.translateExprToType(e.Args[2], types.Typ[types.Int]), c.zeroValue(t2.Elem()), c.translateExprToType(e.Args[1], types.Typ[types.Int]))
}
return fmt.Sprintf("new %s(Go$makeArray(%s, %s, function() { return %s; }))", c.typeName(c.info.Types[e.Args[0]]), toArrayType(t2.Elem()), c.translateExprToType(e.Args[1], types.Typ[types.Int]), c.zeroValue(t2.Elem()))
default:
args := []string{"undefined"}
for _, arg := range e.Args[1:] {
args = append(args, c.translateExpr(arg))
}
return fmt.Sprintf("new %s(%s)", c.typeName(c.info.Types[e.Args[0]]), strings.Join(args, ", "))
}
case "len":
arg := c.translateExpr(e.Args[0])
switch argType := c.info.Types[e.Args[0]].Underlying().(type) {
case *types.Basic, *types.Slice:
return arg + ".length"
case *types.Pointer:
return fmt.Sprintf("(%s, %d)", arg, argType.Elem().(*types.Array).Len())
case *types.Map:
return fmt.Sprintf("(Go$obj = %s, Go$obj !== null ? Go$keys(Go$obj).length : 0)", arg)
case *types.Chan:
return "0"
// length of array is constant
default:
panic(fmt.Sprintf("Unhandled len type: %T\n", argType))
}
case "cap":
arg := c.translateExpr(e.Args[0])
switch argType := c.info.Types[e.Args[0]].Underlying().(type) {
case *types.Slice:
return arg + ".capacity"
case *types.Pointer:
return fmt.Sprintf("(%s, %d)", arg, argType.Elem().(*types.Array).Len())
case *types.Chan:
return "0"
// capacity of array is constant
default:
panic(fmt.Sprintf("Unhandled cap type: %T\n", argType))
}
case "panic":
return fmt.Sprintf("throw new Go$Panic(%s)", c.translateExprToType(e.Args[0], types.NewInterface(nil, nil)))
case "append":
if e.Ellipsis.IsValid() {
return fmt.Sprintf("Go$append(%s, %s)", c.translateExpr(e.Args[0]), c.translateExprToType(e.Args[1], exprType))
}
sliceType := exprType.Underlying().(*types.Slice)
toAppend := createListComposite(sliceType.Elem(), c.translateExprSlice(e.Args[1:], sliceType.Elem()))
return fmt.Sprintf("Go$append(%s, new %s(%s))", c.translateExpr(e.Args[0]), c.typeName(exprType), toAppend)
case "delete":
return fmt.Sprintf(`delete (%s || Go$Map.Go$nil)[%s]`, c.translateExpr(e.Args[0]), c.makeKey(e.Args[1], c.info.Types[e.Args[0]].Underlying().(*types.Map).Key()))
case "copy":
return fmt.Sprintf("Go$copy(%s, %s)", c.translateExprToType(e.Args[0], types.NewSlice(types.Typ[types.Byte])), c.translateExprToType(e.Args[1], types.NewSlice(types.Typ[types.Byte])))
case "print", "println":
return fmt.Sprintf("console.log(%s)", strings.Join(c.translateExprSlice(e.Args, nil), ", "))
case "complex":
return fmt.Sprintf("new %s(%s, %s)", c.typeName(c.info.Types[e]), c.translateExpr(e.Args[0]), c.translateExpr(e.Args[1]))
case "real":
return c.translateExpr(e.Args[0]) + ".real"
case "imag":
return c.translateExpr(e.Args[0]) + ".imag"
case "recover":
return "Go$recover()"
case "close":
return `Go$throwRuntimeError("not supported by GopherJS: close")`
default:
panic(fmt.Sprintf("Unhandled builtin: %s\n", o.Name()))
}
case *types.TypeName: // conversion
if basic, isBasic := o.Type().Underlying().(*types.Basic); isBasic && !types.IsIdentical(c.info.Types[e.Args[0]], types.Typ[types.UnsafePointer]) {
return fixNumber(c.translateExprToType(e.Args[0], o.Type()), basic)
}
return c.translateExprToType(e.Args[0], o.Type())
}
case *ast.FuncType: // conversion
return c.translateExprToType(e.Args[0], c.info.Types[plainFun])
}
funType := c.info.Types[plainFun]
sig, isSig := funType.Underlying().(*types.Signature)
if !isSig { // conversion
if c.pkg.Path() == "reflect" {
if call, isCall := e.Args[0].(*ast.CallExpr); isCall && types.IsIdentical(c.info.Types[call.Fun], types.Typ[types.UnsafePointer]) {
if named, isNamed := funType.(*types.Pointer).Elem().(*types.Named); isNamed {
return c.translateExpr(call.Args[0]) + "." + named.Obj().Name() // unsafe conversion
}
}
}
return c.translateExprToType(e.Args[0], funType)
}
var fun string
switch f := plainFun.(type) {
case *ast.SelectorExpr:
sel := c.info.Selections[f]
switch sel.Kind() {
case types.MethodVal:
methodsRecvType := sel.Obj().(*types.Func).Type().(*types.Signature).Recv().Type()
_, pointerExpected := methodsRecvType.(*types.Pointer)
_, isPointer := sel.Recv().Underlying().(*types.Pointer)
_, isStruct := sel.Recv().Underlying().(*types.Struct)
_, isArray := sel.Recv().Underlying().(*types.Array)
if pointerExpected && !isPointer && !isStruct && !isArray {
target := c.translateExpr(f.X)
vVar := c.newVariable("v")
fun = fmt.Sprintf("(new %s(function() { return %s; }, function(%s) { %s = %s; })).%s", c.typeName(methodsRecvType), target, vVar, target, vVar, f.Sel.Name)
break
}
if isWrapped(sel.Recv()) {
fun = fmt.Sprintf("(new %s(%s)).%s", c.typeName(sel.Recv()), c.translateExpr(f.X), f.Sel.Name)
break
}
fun = fmt.Sprintf("%s.%s", c.translateExpr(f.X), f.Sel.Name)
case types.FieldVal, types.MethodExpr, types.PackageObj:
fun = c.translateExpr(f)
default:
panic("")
}
default:
fun = c.translateExpr(plainFun)
}
if len(e.Args) == 1 {
if tuple, isTuple := c.info.Types[e.Args[0]].(*types.Tuple); isTuple {
args := make([]ast.Expr, tuple.Len())
for i := range args {
args[i] = c.newIdent(fmt.Sprintf("Go$tuple[%d]", i), tuple.At(i).Type())
}
return fmt.Sprintf("(Go$tuple = %s, %s(%s))", c.translateExpr(e.Args[0]), fun, c.translateArgs(sig, args, false))
}
}
return fmt.Sprintf("%s(%s)", fun, c.translateArgs(sig, e.Args, e.Ellipsis.IsValid()))
case *ast.StarExpr:
if c1, isCall := e.X.(*ast.CallExpr); isCall && len(c1.Args) == 1 {
if c2, isCall := c1.Args[0].(*ast.CallExpr); isCall && len(c2.Args) == 1 && types.IsIdentical(c.info.Types[c2.Fun], types.Typ[types.UnsafePointer]) {
if unary, isUnary := c2.Args[0].(*ast.UnaryExpr); isUnary && unary.Op == token.AND {
return c.translateExpr(unary.X) // unsafe conversion
}
}
}
switch exprType.Underlying().(type) {
case *types.Struct, *types.Array:
return c.translateExpr(e.X)
}
return c.translateExpr(e.X) + ".Go$get()"
case *ast.TypeAssertExpr:
if e.Type == nil {
return c.translateExpr(e.X)
}
t := c.info.Types[e.Type]
check := "Go$obj !== null && " + c.typeCheck("Go$obj.constructor", t)
value := "Go$obj"
if _, isInterface := t.Underlying().(*types.Interface); !isInterface {
value += ".Go$val"
}
if _, isTuple := exprType.(*types.Tuple); isTuple {
return fmt.Sprintf("(Go$obj = %s, %s ? [%s, true] : [%s, false])", c.translateExpr(e.X), check, value, c.zeroValue(c.info.Types[e.Type]))
}
return fmt.Sprintf("(Go$obj = %s, %s ? %s : Go$typeAssertionFailed(Go$obj))", c.translateExpr(e.X), check, value)
case *ast.Ident:
if e.Name == "_" {
panic("Tried to translate underscore identifier.")
}
switch o := c.info.Objects[e].(type) {
case *types.PkgName:
return c.pkgVars[o.Pkg().Path()]
case *types.Var, *types.Const:
return c.objectName(o)
case *types.Func:
return c.objectName(o)
case *types.TypeName:
return c.typeName(o.Type())
case *types.Nil:
return c.zeroValue(c.info.Types[e])
case nil:
return e.Name
default:
panic(fmt.Sprintf("Unhandled object: %T\n", o))
}
case nil:
return ""
default:
panic(fmt.Sprintf("Unhandled expression: %T\n", e))
}
}
func (c *funcContext) translateExpr(expr ast.Expr) *expression {
exprType := c.p.info.Types[expr].Type
if value := c.p.info.Types[expr].Value; value != nil {
basic := types.Typ[types.String]
if value.Kind() != exact.String { // workaround for bug in go/types
basic = exprType.Underlying().(*types.Basic)
}
switch {
case basic.Info()&types.IsBoolean != 0:
return c.formatExpr("%s", strconv.FormatBool(exact.BoolVal(value)))
case basic.Info()&types.IsInteger != 0:
if is64Bit(basic) {
d, _ := exact.Uint64Val(value)
if basic.Kind() == types.Int64 {
return c.formatExpr("new %s(%s, %s)", c.typeName(exprType), strconv.FormatInt(int64(d)>>32, 10), strconv.FormatUint(d&(1<<32-1), 10))
}
return c.formatExpr("new %s(%s, %s)", c.typeName(exprType), strconv.FormatUint(d>>32, 10), strconv.FormatUint(d&(1<<32-1), 10))
}
d, _ := exact.Int64Val(value)
return c.formatExpr("%s", strconv.FormatInt(d, 10))
case basic.Info()&types.IsFloat != 0:
f, _ := exact.Float64Val(value)
return c.formatExpr("%s", strconv.FormatFloat(f, 'g', -1, 64))
case basic.Info()&types.IsComplex != 0:
r, _ := exact.Float64Val(exact.Real(value))
i, _ := exact.Float64Val(exact.Imag(value))
if basic.Kind() == types.UntypedComplex {
exprType = types.Typ[types.Complex128]
}
return c.formatExpr("new %s(%s, %s)", c.typeName(exprType), strconv.FormatFloat(r, 'g', -1, 64), strconv.FormatFloat(i, 'g', -1, 64))
case basic.Info()&types.IsString != 0:
return c.formatExpr("%s", encodeString(exact.StringVal(value)))
default:
panic("Unhandled constant type: " + basic.String())
}
}
switch e := expr.(type) {
case *ast.CompositeLit:
if ptrType, isPointer := exprType.(*types.Pointer); isPointer {
exprType = ptrType.Elem()
}
collectIndexedElements := func(elementType types.Type) []string {
elements := make([]string, 0)
i := 0
zero := c.zeroValue(elementType)
for _, element := range e.Elts {
if kve, isKve := element.(*ast.KeyValueExpr); isKve {
key, _ := exact.Int64Val(c.p.info.Types[kve.Key].Value)
i = int(key)
element = kve.Value
}
for len(elements) <= i {
elements = append(elements, zero)
}
elements[i] = c.translateImplicitConversion(element, elementType).String()
i++
}
return elements
}
switch t := exprType.Underlying().(type) {
case *types.Array:
elements := collectIndexedElements(t.Elem())
if len(elements) != 0 {
zero := c.zeroValue(t.Elem())
for len(elements) < int(t.Len()) {
elements = append(elements, zero)
}
return c.formatExpr(`go$toNativeArray("%s", [%s])`, typeKind(t.Elem()), strings.Join(elements, ", "))
}
return c.formatExpr(`go$makeNativeArray("%s", %d, function() { return %s; })`, typeKind(t.Elem()), int(t.Len()), c.zeroValue(t.Elem()))
case *types.Slice:
return c.formatExpr("new %s([%s])", c.typeName(exprType), strings.Join(collectIndexedElements(t.Elem()), ", "))
case *types.Map:
mapVar := c.newVariable("_map")
keyVar := c.newVariable("_key")
assignments := ""
for _, element := range e.Elts {
kve := element.(*ast.KeyValueExpr)
assignments += c.formatExpr(`%s = %s, %s[%s] = { k: %s, v: %s }, `, keyVar, c.translateImplicitConversion(kve.Key, t.Key()), mapVar, c.makeKey(c.newIdent(keyVar, t.Key()), t.Key()), keyVar, c.translateImplicitConversion(kve.Value, t.Elem())).String()
}
return c.formatExpr("(%s = new Go$Map(), %s%s)", mapVar, assignments, mapVar)
case *types.Struct:
elements := make([]string, t.NumFields())
isKeyValue := true
if len(e.Elts) != 0 {
_, isKeyValue = e.Elts[0].(*ast.KeyValueExpr)
}
if !isKeyValue {
for i, element := range e.Elts {
elements[i] = c.translateImplicitConversion(element, t.Field(i).Type()).String()
}
}
if isKeyValue {
for i := range elements {
elements[i] = c.zeroValue(t.Field(i).Type())
}
for _, element := range e.Elts {
kve := element.(*ast.KeyValueExpr)
for j := range elements {
if kve.Key.(*ast.Ident).Name == t.Field(j).Name() {
elements[j] = c.translateImplicitConversion(kve.Value, t.Field(j).Type()).String()
break
}
}
}
}
return c.formatExpr("new %s.Ptr(%s)", c.typeName(exprType), strings.Join(elements, ", "))
default:
panic(fmt.Sprintf("Unhandled CompositeLit type: %T\n", t))
}
case *ast.FuncLit:
params, body := c.translateFunction(e.Type, exprType.(*types.Signature), e.Body.List)
if len(c.escapingVars) != 0 {
list := strings.Join(c.escapingVars, ", ")
return c.formatExpr("(function(%s) { return function(%s) {\n%s%s}; })(%s)", list, strings.Join(params, ", "), string(body), strings.Repeat("\t", c.p.indentation), list)
}
return c.formatExpr("(function(%s) {\n%s%s})", strings.Join(params, ", "), string(body), strings.Repeat("\t", c.p.indentation))
case *ast.UnaryExpr:
switch e.Op {
case token.AND:
switch c.p.info.Types[e.X].Type.Underlying().(type) {
case *types.Struct, *types.Array:
return c.translateExpr(e.X)
default:
if _, isComposite := e.X.(*ast.CompositeLit); isComposite {
return c.formatExpr("go$newDataPointer(%e, %s)", e.X, c.typeName(c.p.info.Types[e].Type))
}
closurePrefix := ""
closureSuffix := ""
if len(c.escapingVars) != 0 {
list := strings.Join(c.escapingVars, ", ")
closurePrefix = "(function(" + list + ") { return "
closureSuffix = "; })(" + list + ")"
}
vVar := c.newVariable("v")
return c.formatExpr("%snew %s(function() { return %e; }, function(%s) { %s; })%s", closurePrefix, c.typeName(exprType), e.X, vVar, c.translateAssign(e.X, vVar), closureSuffix)
}
case token.ARROW:
return c.formatExpr("undefined")
}
t := c.p.info.Types[e.X].Type
basic := t.Underlying().(*types.Basic)
switch e.Op {
case token.ADD:
return c.translateExpr(e.X)
case token.SUB:
switch {
case is64Bit(basic):
return c.formatExpr("new %1s(-%2h, -%2l)", c.typeName(t), e.X)
case basic.Info()&types.IsComplex != 0:
return c.formatExpr("new %1s(-%2r, -%2i)", c.typeName(t), e.X)
case basic.Info()&types.IsUnsigned != 0:
return c.fixNumber(c.formatExpr("-%e", e.X), basic)
default:
return c.formatExpr("-%e", e.X)
}
case token.XOR:
if is64Bit(basic) {
return c.formatExpr("new %1s(~%2h, ~%2l >>> 0)", c.typeName(t), e.X)
}
return c.fixNumber(c.formatExpr("~%e", e.X), basic)
case token.NOT:
x := c.translateExpr(e.X)
if x.String() == "true" {
return c.formatExpr("false")
}
if x.String() == "false" {
return c.formatExpr("true")
}
return c.formatExpr("!%s", x)
default:
panic(e.Op)
}
case *ast.BinaryExpr:
if e.Op == token.NEQ {
return c.formatExpr("!(%s)", c.translateExpr(&ast.BinaryExpr{
X: e.X,
Op: token.EQL,
Y: e.Y,
}))
}
t := c.p.info.Types[e.X].Type
t2 := c.p.info.Types[e.Y].Type
_, isInterface := t2.Underlying().(*types.Interface)
if isInterface {
t = t2
}
if basic, isBasic := t.Underlying().(*types.Basic); isBasic && basic.Info()&types.IsNumeric != 0 {
if is64Bit(basic) {
switch e.Op {
case token.MUL:
return c.formatExpr("go$mul64(%e, %e)", e.X, e.Y)
case token.QUO:
return c.formatExpr("go$div64(%e, %e, false)", e.X, e.Y)
case token.REM:
return c.formatExpr("go$div64(%e, %e, true)", e.X, e.Y)
case token.SHL:
return c.formatExpr("go$shiftLeft64(%e, %f)", e.X, e.Y)
case token.SHR:
return c.formatExpr("go$shiftRight%s(%e, %f)", toJavaScriptType(basic), e.X, e.Y)
case token.EQL:
return c.formatExpr("(%1h === %2h && %1l === %2l)", e.X, e.Y)
case token.LSS:
return c.formatExpr("(%1h < %2h || (%1h === %2h && %1l < %2l))", e.X, e.Y)
case token.LEQ:
return c.formatExpr("(%1h < %2h || (%1h === %2h && %1l <= %2l))", e.X, e.Y)
case token.GTR:
return c.formatExpr("(%1h > %2h || (%1h === %2h && %1l > %2l))", e.X, e.Y)
case token.GEQ:
return c.formatExpr("(%1h > %2h || (%1h === %2h && %1l >= %2l))", e.X, e.Y)
case token.ADD, token.SUB:
return c.formatExpr("new %3s(%1h %4t %2h, %1l %4t %2l)", e.X, e.Y, c.typeName(t), e.Op)
case token.AND, token.OR, token.XOR:
return c.formatExpr("new %3s(%1h %4t %2h, (%1l %4t %2l) >>> 0)", e.X, e.Y, c.typeName(t), e.Op)
case token.AND_NOT:
return c.formatExpr("new %3s(%1h &~ %2h, (%1l &~ %2l) >>> 0)", e.X, e.Y, c.typeName(t))
default:
panic(e.Op)
}
}
if basic.Info()&types.IsComplex != 0 {
switch e.Op {
case token.EQL:
if basic.Kind() == types.Complex64 {
return c.formatExpr("(go$float32IsEqual(%1r, %2r) && go$float32IsEqual(%1i, %2i))", e.X, e.Y)
}
return c.formatExpr("(%1r === %2r && %1i === %2i)", e.X, e.Y)
case token.ADD, token.SUB:
return c.formatExpr("new %3s(%1r %4t %2r, %1i %4t %2i)", e.X, e.Y, c.typeName(t), e.Op)
case token.MUL:
return c.formatExpr("new %3s(%1r * %2r - %1i * %2i, %1r * %2i + %1i * %2r)", e.X, e.Y, c.typeName(t))
case token.QUO:
return c.formatExpr("go$divComplex(%e, %e)", e.X, e.Y)
default:
panic(e.Op)
}
}
switch e.Op {
case token.EQL:
if basic.Kind() == types.Float32 {
return c.formatParenExpr("go$float32IsEqual(%e, %e)", e.X, e.Y)
}
return c.formatParenExpr("%e === %e", e.X, e.Y)
case token.LSS, token.LEQ, token.GTR, token.GEQ:
return c.formatExpr("%e %t %e", e.X, e.Op, e.Y)
case token.ADD, token.SUB:
if basic.Info()&types.IsInteger != 0 {
return c.fixNumber(c.formatExpr("%e %t %e", e.X, e.Op, e.Y), basic)
}
return c.formatExpr("%e %t %e", e.X, e.Op, e.Y)
case token.MUL:
switch basic.Kind() {
case types.Int32, types.Int:
return c.formatParenExpr("(((%1e >>> 16 << 16) * %2e >> 0) + (%1e << 16 >>> 16) * %2e) >> 0", e.X, e.Y)
case types.Uint32, types.Uint, types.Uintptr:
return c.formatParenExpr("(((%1e >>> 16 << 16) * %2e >>> 0) + (%1e << 16 >>> 16) * %2e) >>> 0", e.X, e.Y)
case types.Float32, types.Float64:
return c.formatExpr("%e * %e", e.X, e.Y)
default:
return c.fixNumber(c.formatExpr("%e * %e", e.X, e.Y), basic)
}
case token.QUO:
if basic.Info()&types.IsInteger != 0 {
// cut off decimals
shift := ">>"
if basic.Info()&types.IsUnsigned != 0 {
shift = ">>>"
}
return c.formatExpr(`(%1s = %2e / %3e, (%1s === %1s && %1s !== 1/0 && %1s !== -1/0) ? %1s %4s 0 : go$throwRuntimeError("integer divide by zero"))`, c.newVariable("_q"), e.X, e.Y, shift)
}
return c.formatExpr("%e / %e", e.X, e.Y)
case token.REM:
return c.formatExpr(`(%1s = %2e %% %3e, %1s === %1s ? %1s : go$throwRuntimeError("integer divide by zero"))`, c.newVariable("_r"), e.X, e.Y)
case token.SHL, token.SHR:
op := e.Op.String()
if e.Op == token.SHR && basic.Info()&types.IsUnsigned != 0 {
op = ">>>"
}
if c.p.info.Types[e.Y].Value != nil {
return c.fixNumber(c.formatExpr("%e %s %e", e.X, op, e.Y), basic)
}
if e.Op == token.SHR && basic.Info()&types.IsUnsigned == 0 {
return c.fixNumber(c.formatParenExpr("%e >> go$min(%e, 31)", e.X, e.Y), basic)
}
y := c.newVariable("y")
return c.fixNumber(c.formatExpr("(%s = %s, %s < 32 ? (%e %s %s) : 0)", y, c.translateImplicitConversion(e.Y, types.Typ[types.Uint]), y, e.X, op, y), basic)
case token.AND, token.OR:
if basic.Info()&types.IsUnsigned != 0 {
return c.formatParenExpr("(%e %t %e) >>> 0", e.X, e.Op, e.Y)
}
return c.formatParenExpr("%e %t %e", e.X, e.Op, e.Y)
case token.AND_NOT:
return c.formatParenExpr("%e & ~%e", e.X, e.Y)
case token.XOR:
return c.fixNumber(c.formatParenExpr("%e ^ %e", e.X, e.Y), basic)
default:
panic(e.Op)
}
}
switch e.Op {
case token.ADD, token.LSS, token.LEQ, token.GTR, token.GEQ:
return c.formatExpr("%e %t %e", e.X, e.Op, e.Y)
case token.LAND:
x := c.translateExpr(e.X)
y := c.translateExpr(e.Y)
if x.String() == "false" {
return c.formatExpr("false")
}
return c.formatExpr("%s && %s", x, y)
case token.LOR:
x := c.translateExpr(e.X)
y := c.translateExpr(e.Y)
if x.String() == "true" {
return c.formatExpr("true")
}
return c.formatExpr("%s || %s", x, y)
case token.EQL:
switch u := t.Underlying().(type) {
case *types.Struct:
x := c.newVariable("x")
y := c.newVariable("y")
var conds []string
for i := 0; i < u.NumFields(); i++ {
field := u.Field(i)
if field.Name() == "_" {
continue
}
conds = append(conds, c.translateExpr(&ast.BinaryExpr{
X: c.newIdent(x+"."+fieldName(u, i), field.Type()),
Op: token.EQL,
Y: c.newIdent(y+"."+fieldName(u, i), field.Type()),
}).String())
}
if len(conds) == 0 {
conds = []string{"true"}
}
return c.formatExpr("(%s = %e, %s = %e, %s)", x, e.X, y, e.Y, strings.Join(conds, " && "))
case *types.Interface:
if isJsObject(t) {
return c.formatExpr("%s === %s", c.translateImplicitConversion(e.X, t), c.translateImplicitConversion(e.Y, t))
}
return c.formatExpr("go$interfaceIsEqual(%s, %s)", c.translateImplicitConversion(e.X, t), c.translateImplicitConversion(e.Y, t))
case *types.Array:
return c.formatExpr("go$arrayIsEqual(%e, %e)", e.X, e.Y)
case *types.Pointer:
xUnary, xIsUnary := e.X.(*ast.UnaryExpr)
yUnary, yIsUnary := e.Y.(*ast.UnaryExpr)
if xIsUnary && xUnary.Op == token.AND && yIsUnary && yUnary.Op == token.AND {
xIndex, xIsIndex := xUnary.X.(*ast.IndexExpr)
yIndex, yIsIndex := yUnary.X.(*ast.IndexExpr)
if xIsIndex && yIsIndex {
return c.formatExpr("go$sliceIsEqual(%e, %f, %e, %f)", xIndex.X, xIndex.Index, yIndex.X, yIndex.Index)
}
}
switch u.Elem().Underlying().(type) {
case *types.Struct, *types.Interface:
return c.formatExpr("%s === %s", c.translateImplicitConversion(e.X, t), c.translateImplicitConversion(e.Y, t))
case *types.Array:
return c.formatExpr("go$arrayIsEqual(%s, %s)", c.translateImplicitConversion(e.X, t), c.translateImplicitConversion(e.Y, t))
default:
return c.formatExpr("go$pointerIsEqual(%s, %s)", c.translateImplicitConversion(e.X, t), c.translateImplicitConversion(e.Y, t))
}
default:
return c.formatExpr("%s === %s", c.translateImplicitConversion(e.X, t), c.translateImplicitConversion(e.Y, t))
}
default:
panic(e.Op)
}
case *ast.ParenExpr:
x := c.translateExpr(e.X)
if x.String() == "true" || x.String() == "false" {
return x
}
return c.formatParenExpr("%s", x)
case *ast.IndexExpr:
switch t := c.p.info.Types[e.X].Type.Underlying().(type) {
case *types.Array, *types.Pointer:
return c.formatExpr("%e[%f]", e.X, e.Index)
case *types.Slice:
return c.formatExpr(`((%2f < 0 || %2f >= %1e.length) ? go$throwRuntimeError("index out of range") : %1e.array[%1e.offset + %2f])`, e.X, e.Index)
case *types.Map:
key := c.makeKey(e.Index, t.Key())
if _, isTuple := exprType.(*types.Tuple); isTuple {
return c.formatExpr(`(%1s = %2e[%3s], %1s !== undefined ? [%1s.v, true] : [%4s, false])`, c.newVariable("_entry"), e.X, key, c.zeroValue(t.Elem()))
}
return c.formatExpr(`(%1s = %2e[%3s], %1s !== undefined ? %1s.v : %4s)`, c.newVariable("_entry"), e.X, key, c.zeroValue(t.Elem()))
case *types.Basic:
return c.formatExpr("%e.charCodeAt(%f)", e.X, e.Index)
default:
panic(fmt.Sprintf("Unhandled IndexExpr: %T\n", t))
}
case *ast.SliceExpr:
if b, isBasic := c.p.info.Types[e.X].Type.Underlying().(*types.Basic); isBasic && b.Info()&types.IsString != 0 {
switch {
case e.Low == nil && e.High == nil:
return c.translateExpr(e.X)
case e.Low == nil:
return c.formatExpr("%e.substring(0, %f)", e.X, e.High)
case e.High == nil:
return c.formatExpr("%e.substring(%f)", e.X, e.Low)
default:
return c.formatExpr("%e.substring(%f, %f)", e.X, e.Low, e.High)
}
}
slice := c.translateConversionToSlice(e.X, exprType)
switch {
case e.Low == nil && e.High == nil:
return c.formatExpr("%s", slice)
case e.Low == nil:
if e.Max != nil {
return c.formatExpr("go$subslice(%s, 0, %f, %f)", slice, e.High, e.Max)
}
return c.formatExpr("go$subslice(%s, 0, %f)", slice, e.High)
case e.High == nil:
return c.formatExpr("go$subslice(%s, %f)", slice, e.Low)
default:
if e.Max != nil {
return c.formatExpr("go$subslice(%s, %f, %f, %f)", slice, e.Low, e.High, e.Max)
}
return c.formatExpr("go$subslice(%s, %f, %f)", slice, e.Low, e.High)
}
case *ast.SelectorExpr:
sel := c.p.info.Selections[e]
parameterName := func(v *types.Var) string {
if v.Anonymous() || v.Name() == "" {
return c.newVariable("param")
}
return c.newVariable(v.Name())
}
makeParametersList := func() []string {
params := sel.Obj().Type().(*types.Signature).Params()
names := make([]string, params.Len())
for i := 0; i < params.Len(); i++ {
names[i] = parameterName(params.At(i))
}
return names
}
switch sel.Kind() {
case types.FieldVal:
fields, jsTag := c.translateSelection(sel)
if jsTag != "" {
if _, ok := sel.Type().(*types.Signature); ok {
return c.formatExpr("go$internalize(%1e.%2s.%3s, %4s, %1e.%2s)", e.X, strings.Join(fields, "."), jsTag, c.typeName(sel.Type()))
}
return c.internalize(c.formatExpr("%e.%s.%s", e.X, strings.Join(fields, "."), jsTag), sel.Type())
}
return c.formatExpr("%e.%s", e.X, strings.Join(fields, "."))
case types.MethodVal:
if !sel.Obj().Exported() {
c.p.dependencies[sel.Obj()] = true
}
parameters := makeParametersList()
target := c.translateExpr(e.X)
if isWrapped(sel.Recv()) {
target = c.formatParenExpr("new %s(%s)", c.typeName(sel.Recv()), target)
}
recv := c.newVariable("_recv")
return c.formatExpr("(%s = %s, function(%s) { return %s.%s(%s); })", recv, target, strings.Join(parameters, ", "), recv, e.Sel.Name, strings.Join(parameters, ", "))
case types.MethodExpr:
if !sel.Obj().Exported() {
c.p.dependencies[sel.Obj()] = true
}
recv := "recv"
if isWrapped(sel.Recv()) {
recv = fmt.Sprintf("(new %s(recv))", c.typeName(sel.Recv()))
}
parameters := makeParametersList()
return c.formatExpr("(function(%s) { return %s.%s(%s); })", strings.Join(append([]string{"recv"}, parameters...), ", "), recv, sel.Obj().(*types.Func).Name(), strings.Join(parameters, ", "))
case types.PackageObj:
if isJsPackage(sel.Obj().Pkg()) {
switch sel.Obj().Name() {
case "Global":
return c.formatExpr("go$global")
case "This":
if c.flattened {
return c.formatExpr("go$this")
}
return c.formatExpr("this")
case "Arguments":
args := "arguments"
if c.flattened {
args = "go$args"
}
return c.formatExpr(`new (go$sliceType(%s.Object))(go$global.Array.prototype.slice.call(%s))`, c.p.pkgVars["github.com/gopherjs/gopherjs/js"], args)
default:
panic("Invalid js package object: " + sel.Obj().Name())
}
}
return c.formatExpr("%s", c.objectName(sel.Obj()))
}
panic("")
case *ast.CallExpr:
plainFun := e.Fun
for {
if p, isParen := plainFun.(*ast.ParenExpr); isParen {
plainFun = p.X
continue
}
break
}
var isType func(ast.Expr) bool
isType = func(expr ast.Expr) bool {
switch e := expr.(type) {
case *ast.ArrayType, *ast.ChanType, *ast.FuncType, *ast.InterfaceType, *ast.MapType, *ast.StructType:
return true
case *ast.StarExpr:
return isType(e.X)
case *ast.Ident:
_, ok := c.p.info.Uses[e].(*types.TypeName)
return ok
case *ast.SelectorExpr:
_, ok := c.p.info.Uses[e.Sel].(*types.TypeName)
return ok
case *ast.ParenExpr:
return isType(e.X)
default:
return false
}
}
if isType(plainFun) {
return c.formatExpr("%s", c.translateConversion(e.Args[0], c.p.info.Types[plainFun].Type))
}
var fun *expression
switch f := plainFun.(type) {
case *ast.Ident:
if o, ok := c.p.info.Uses[f].(*types.Builtin); ok {
switch o.Name() {
case "new":
t := c.p.info.Types[e].Type.(*types.Pointer)
if c.p.pkg.Path() == "syscall" && types.Identical(t.Elem().Underlying(), types.Typ[types.Uintptr]) {
return c.formatExpr("new Uint8Array(8)")
}
switch t.Elem().Underlying().(type) {
case *types.Struct, *types.Array:
return c.formatExpr("%s", c.zeroValue(t.Elem()))
default:
return c.formatExpr("go$newDataPointer(%s, %s)", c.zeroValue(t.Elem()), c.typeName(t))
}
case "make":
switch argType := c.p.info.Types[e.Args[0]].Type.Underlying().(type) {
case *types.Slice:
t := c.typeName(c.p.info.Types[e.Args[0]].Type)
if len(e.Args) == 3 {
return c.formatExpr("%s.make(%f, %f, function() { return %s; })", t, e.Args[1], e.Args[2], c.zeroValue(argType.Elem()))
}
return c.formatExpr("%s.make(%f, 0, function() { return %s; })", t, e.Args[1], c.zeroValue(argType.Elem()))
case *types.Map:
return c.formatExpr("new Go$Map()")
case *types.Chan:
return c.formatExpr("new %s()", c.typeName(c.p.info.Types[e.Args[0]].Type))
default:
panic(fmt.Sprintf("Unhandled make type: %T\n", argType))
}
case "len":
arg := c.translateExpr(e.Args[0])
switch argType := c.p.info.Types[e.Args[0]].Type.Underlying().(type) {
case *types.Basic, *types.Slice:
return c.formatExpr("%s.length", arg)
case *types.Pointer:
return c.formatExpr("(%s, %d)", arg, argType.Elem().(*types.Array).Len())
case *types.Map:
return c.formatExpr("go$keys(%s).length", arg)
case *types.Chan:
return c.formatExpr("0")
// length of array is constant
default:
panic(fmt.Sprintf("Unhandled len type: %T\n", argType))
}
case "cap":
arg := c.translateExpr(e.Args[0])
switch argType := c.p.info.Types[e.Args[0]].Type.Underlying().(type) {
case *types.Slice:
return c.formatExpr("%s.capacity", arg)
case *types.Pointer:
return c.formatExpr("(%s, %d)", arg, argType.Elem().(*types.Array).Len())
case *types.Chan:
return c.formatExpr("0")
// capacity of array is constant
default:
panic(fmt.Sprintf("Unhandled cap type: %T\n", argType))
}
case "panic":
return c.formatExpr("throw go$panic(%s)", c.translateImplicitConversion(e.Args[0], types.NewInterface(nil, nil)))
case "append":
if len(e.Args) == 1 {
return c.translateExpr(e.Args[0])
}
if e.Ellipsis.IsValid() {
return c.formatExpr("go$appendSlice(%e, %s)", e.Args[0], c.translateConversionToSlice(e.Args[1], exprType))
}
sliceType := exprType.Underlying().(*types.Slice)
return c.formatExpr("go$append(%e, %s)", e.Args[0], strings.Join(c.translateExprSlice(e.Args[1:], sliceType.Elem()), ", "))
case "delete":
return c.formatExpr(`delete %e[%s]`, e.Args[0], c.makeKey(e.Args[1], c.p.info.Types[e.Args[0]].Type.Underlying().(*types.Map).Key()))
case "copy":
if basic, isBasic := c.p.info.Types[e.Args[1]].Type.Underlying().(*types.Basic); isBasic && basic.Info()&types.IsString != 0 {
return c.formatExpr("go$copyString(%e, %e)", e.Args[0], e.Args[1])
}
return c.formatExpr("go$copySlice(%e, %e)", e.Args[0], e.Args[1])
case "print", "println":
return c.formatExpr("console.log(%s)", strings.Join(c.translateExprSlice(e.Args, nil), ", "))
case "complex":
return c.formatExpr("new %s(%e, %e)", c.typeName(c.p.info.Types[e].Type), e.Args[0], e.Args[1])
case "real":
return c.formatExpr("%e.real", e.Args[0])
case "imag":
return c.formatExpr("%e.imag", e.Args[0])
case "recover":
return c.formatExpr("go$recover()")
case "close":
return c.formatExpr(`go$notSupported("close")`)
default:
panic(fmt.Sprintf("Unhandled builtin: %s\n", o.Name()))
}
}
fun = c.translateExpr(plainFun)
case *ast.SelectorExpr:
sel := c.p.info.Selections[f]
o := sel.Obj()
externalizeExpr := func(e ast.Expr) string {
t := c.p.info.Types[e].Type
if types.Identical(t, types.Typ[types.UntypedNil]) {
return "null"
}
return c.externalize(c.translateExpr(e).String(), t)
}
externalizeArgs := func(args []ast.Expr) string {
s := make([]string, len(args))
for i, arg := range args {
s[i] = externalizeExpr(arg)
}
return strings.Join(s, ", ")
}
switch sel.Kind() {
case types.MethodVal:
if !sel.Obj().Exported() {
c.p.dependencies[sel.Obj()] = true
}
methodName := o.Name()
if reservedKeywords[methodName] {
methodName += "$"
}
fun = c.translateExpr(f.X)
t := sel.Recv()
for _, index := range sel.Index()[:len(sel.Index())-1] {
if ptr, isPtr := t.(*types.Pointer); isPtr {
t = ptr.Elem()
}
s := t.Underlying().(*types.Struct)
fun = c.formatExpr("%s.%s", fun, fieldName(s, index))
t = s.Field(index).Type()
}
if isJsPackage(o.Pkg()) {
globalRef := func(id string) string {
if fun.String() == "go$global" && len(id) > 3 && strings.EqualFold(id[:3], "go$") {
return id
}
return fun.String() + "." + id
}
switch o.Name() {
case "Get":
if id, ok := c.identifierConstant(e.Args[0]); ok {
return c.formatExpr("%s", globalRef(id))
}
return c.formatExpr("%s[go$externalize(%e, Go$String)]", fun, e.Args[0])
case "Set":
if id, ok := c.identifierConstant(e.Args[0]); ok {
return c.formatExpr("%s = %s", globalRef(id), externalizeExpr(e.Args[1]))
}
return c.formatExpr("%s[go$externalize(%e, Go$String)] = %s", fun, e.Args[0], externalizeExpr(e.Args[1]))
case "Delete":
return c.formatExpr("delete %s[go$externalize(%e, Go$String)]", fun, e.Args[0])
case "Length":
return c.formatExpr("go$parseInt(%s.length)", fun)
case "Index":
return c.formatExpr("%s[%e]", fun, e.Args[0])
case "SetIndex":
return c.formatExpr("%s[%e] = %s", fun, e.Args[0], externalizeExpr(e.Args[1]))
case "Call":
if id, ok := c.identifierConstant(e.Args[0]); ok {
if e.Ellipsis.IsValid() {
objVar := c.newVariable("obj")
return c.formatExpr("(%s = %s, %s.%s.apply(%s, %s))", objVar, fun, objVar, id, objVar, externalizeExpr(e.Args[1]))
}
return c.formatExpr("%s(%s)", globalRef(id), externalizeArgs(e.Args[1:]))
}
if e.Ellipsis.IsValid() {
objVar := c.newVariable("obj")
return c.formatExpr("(%s = %s, %s[go$externalize(%e, Go$String)].apply(%s, %s))", objVar, fun, objVar, e.Args[0], objVar, externalizeExpr(e.Args[1]))
}
return c.formatExpr("%s[go$externalize(%e, Go$String)](%s)", fun, e.Args[0], externalizeArgs(e.Args[1:]))
case "Invoke":
if e.Ellipsis.IsValid() {
return c.formatExpr("%s.apply(undefined, %s)", fun, externalizeExpr(e.Args[0]))
}
return c.formatExpr("%s(%s)", fun, externalizeArgs(e.Args))
case "New":
if e.Ellipsis.IsValid() {
return c.formatExpr("new (go$global.Function.prototype.bind.apply(%s, [undefined].concat(%s)))", fun, externalizeExpr(e.Args[0]))
}
return c.formatExpr("new (%s)(%s)", fun, externalizeArgs(e.Args))
case "Bool":
return c.internalize(fun, types.Typ[types.Bool])
case "Str":
return c.internalize(fun, types.Typ[types.String])
case "Int":
return c.internalize(fun, types.Typ[types.Int])
case "Int64":
return c.internalize(fun, types.Typ[types.Int64])
case "Uint64":
return c.internalize(fun, types.Typ[types.Uint64])
case "Float":
return c.internalize(fun, types.Typ[types.Float64])
case "Interface":
return c.internalize(fun, types.NewInterface(nil, nil))
case "Unsafe":
return fun
case "IsUndefined":
return c.formatParenExpr("%s === undefined", fun)
case "IsNull":
return c.formatParenExpr("%s === null", fun)
default:
panic("Invalid js package object: " + o.Name())
}
}
methodsRecvType := o.Type().(*types.Signature).Recv().Type()
_, pointerExpected := methodsRecvType.(*types.Pointer)
_, isPointer := t.Underlying().(*types.Pointer)
_, isStruct := t.Underlying().(*types.Struct)
_, isArray := t.Underlying().(*types.Array)
if pointerExpected && !isPointer && !isStruct && !isArray {
vVar := c.newVariable("v")
fun = c.formatExpr("(new %s(function() { return %s; }, function(%s) { %s = %s; })).%s", c.typeName(methodsRecvType), fun, vVar, fun, vVar, methodName)
break
}
if isWrapped(t) {
fun = c.formatExpr("(new %s(%s)).%s", c.typeName(t), fun, methodName)
break
}
fun = c.formatExpr("%s.%s", fun, methodName)
case types.PackageObj:
if isJsPackage(o.Pkg()) && o.Name() == "InternalObject" {
return c.translateExpr(e.Args[0])
}
fun = c.translateExpr(f)
case types.FieldVal:
fields, jsTag := c.translateSelection(sel)
if jsTag != "" {
sig := sel.Type().(*types.Signature)
return c.internalize(c.formatExpr("%e.%s.%s(%s)", f.X, strings.Join(fields, "."), jsTag, externalizeArgs(e.Args)), sig.Results().At(0).Type())
}
fun = c.formatExpr("%e.%s", f.X, strings.Join(fields, "."))
case types.MethodExpr:
fun = c.translateExpr(f)
default:
panic("")
}
default:
fun = c.translateExpr(plainFun)
}
sig := c.p.info.Types[plainFun].Type.Underlying().(*types.Signature)
if len(e.Args) == 1 {
if tuple, isTuple := c.p.info.Types[e.Args[0]].Type.(*types.Tuple); isTuple {
tupleVar := c.newVariable("_tuple")
args := make([]ast.Expr, tuple.Len())
for i := range args {
args[i] = c.newIdent(c.formatExpr("%s[%d]", tupleVar, i).String(), tuple.At(i).Type())
}
return c.formatExpr("(%s = %e, %s(%s))", tupleVar, e.Args[0], fun, strings.Join(c.translateArgs(sig, args, false), ", "))
}
}
return c.formatExpr("%s(%s)", fun, strings.Join(c.translateArgs(sig, e.Args, e.Ellipsis.IsValid()), ", "))
case *ast.StarExpr:
if c1, isCall := e.X.(*ast.CallExpr); isCall && len(c1.Args) == 1 {
if c2, isCall := c1.Args[0].(*ast.CallExpr); isCall && len(c2.Args) == 1 && types.Identical(c.p.info.Types[c2.Fun].Type, types.Typ[types.UnsafePointer]) {
if unary, isUnary := c2.Args[0].(*ast.UnaryExpr); isUnary && unary.Op == token.AND {
return c.translateExpr(unary.X) // unsafe conversion
}
}
}
switch exprType.Underlying().(type) {
case *types.Struct, *types.Array:
return c.translateExpr(e.X)
}
return c.formatExpr("%e.go$get()", e.X)
case *ast.TypeAssertExpr:
if e.Type == nil {
return c.translateExpr(e.X)
}
t := c.p.info.Types[e.Type].Type
check := "%1e !== null && " + c.typeCheck("%1e.constructor", t)
valueSuffix := ""
if _, isInterface := t.Underlying().(*types.Interface); !isInterface {
valueSuffix = ".go$val"
}
if _, isTuple := exprType.(*types.Tuple); isTuple {
return c.formatExpr("("+check+" ? [%1e%2s, true] : [%3s, false])", e.X, valueSuffix, c.zeroValue(c.p.info.Types[e.Type].Type))
}
return c.formatExpr("("+check+" ? %1e%2s : go$typeAssertionFailed(%1e, %3s))", e.X, valueSuffix, c.typeName(t))
case *ast.Ident:
if e.Name == "_" {
panic("Tried to translate underscore identifier.")
}
switch o := c.p.info.Uses[e].(type) {
case *types.PkgName:
return c.formatExpr("%s", c.p.pkgVars[o.Pkg().Path()])
case *types.Var, *types.Const:
return c.formatExpr("%s", c.objectName(o))
case *types.Func:
return c.formatExpr("%s", c.objectName(o))
case *types.TypeName:
return c.formatExpr("%s", c.typeName(o.Type()))
case *types.Nil:
return c.formatExpr("%s", c.zeroValue(c.p.info.Types[e].Type))
default:
panic(fmt.Sprintf("Unhandled object: %T\n", o))
}
case *This:
this := "this"
if c.flattened {
this = "go$this"
}
if isWrapped(c.p.info.Types[e].Type) {
this += ".go$val"
}
return c.formatExpr(this)
case nil:
return c.formatExpr("")
default:
panic(fmt.Sprintf("Unhandled expression: %T\n", e))
}
}
// builtin typechecks a call to a built-in and returns the result via x.
// If the call has type errors, the returned x is marked as invalid.
//
func (check *checker) builtin(x *operand, call *ast.CallExpr, id builtinId) {
args := call.Args
// declare before goto's
var arg0 ast.Expr // first argument, if present
// check argument count
n := len(args)
msg := ""
bin := predeclaredFuncs[id]
if n < bin.nargs {
msg = "not enough"
} else if !bin.variadic && n > bin.nargs {
msg = "too many"
}
if msg != "" {
check.invalidOp(call.Pos(), msg+" arguments for %s (expected %d, found %d)", call, bin.nargs, n)
goto Error
}
// common case: evaluate first argument if present;
// if it is an expression, x has the expression value
if n > 0 {
arg0 = args[0]
switch id {
case _Make, _New, _Print, _Println, _Offsetof, _Trace:
// respective cases below do the work
default:
// argument must be an expression
check.expr(x, arg0)
if x.mode == invalid {
goto Error
}
}
}
switch id {
case _Append:
if _, ok := x.typ.Underlying().(*Slice); !ok {
check.invalidArg(x.pos(), "%s is not a typed slice", x)
goto Error
}
resultTyp := x.typ
for _, arg := range args[1:] {
check.expr(x, arg)
if x.mode == invalid {
goto Error
}
// TODO(gri) check assignability
}
x.mode = value
x.typ = resultTyp
case _Cap, _Len:
mode := invalid
var val exact.Value
switch typ := implicitArrayDeref(x.typ.Underlying()).(type) {
case *Basic:
if isString(typ) && id == _Len {
if x.mode == constant {
mode = constant
val = exact.MakeInt64(int64(len(exact.StringVal(x.val))))
} else {
mode = value
}
}
case *Array:
mode = value
// spec: "The expressions len(s) and cap(s) are constants
// if the type of s is an array or pointer to an array and
// the expression s does not contain channel receives or
// function calls; in this case s is not evaluated."
if !check.containsCallsOrReceives(arg0) {
mode = constant
val = exact.MakeInt64(typ.len)
}
case *Slice, *Chan:
mode = value
case *Map:
if id == _Len {
mode = value
}
}
if mode == invalid {
check.invalidArg(x.pos(), "%s for %s", x, bin.name)
goto Error
}
x.mode = mode
x.typ = Typ[Int]
x.val = val
case _Close:
ch, ok := x.typ.Underlying().(*Chan)
if !ok {
check.invalidArg(x.pos(), "%s is not a channel", x)
goto Error
}
if ch.dir&ast.SEND == 0 {
check.invalidArg(x.pos(), "%s must not be a receive-only channel", x)
goto Error
}
x.mode = novalue
case _Complex:
if !check.complexArg(x) {
goto Error
}
var y operand
check.expr(&y, args[1])
if y.mode == invalid {
goto Error
}
if !check.complexArg(&y) {
goto Error
}
check.convertUntyped(x, y.typ)
if x.mode == invalid {
goto Error
}
check.convertUntyped(&y, x.typ)
if y.mode == invalid {
goto Error
}
if !IsIdentical(x.typ, y.typ) {
check.invalidArg(x.pos(), "mismatched types %s and %s", x.typ, y.typ)
goto Error
}
typ := x.typ.Underlying().(*Basic)
if x.mode == constant && y.mode == constant {
x.val = exact.BinaryOp(x.val, token.ADD, exact.MakeImag(y.val))
} else {
x.mode = value
}
switch typ.kind {
case Float32:
x.typ = Typ[Complex64]
case Float64:
x.typ = Typ[Complex128]
case UntypedInt, UntypedRune, UntypedFloat:
if x.mode == constant {
typ = defaultType(typ).(*Basic)
x.typ = Typ[UntypedComplex]
} else {
// untyped but not constant; probably because one
// operand is a non-constant shift of untyped lhs
typ = Typ[Float64]
x.typ = Typ[Complex128]
}
default:
check.invalidArg(x.pos(), "float32 or float64 arguments expected")
goto Error
}
if x.mode != constant {
// The arguments have now their final types, which at run-
// time will be materialized. Update the expression trees.
// If the current types are untyped, the materialized type
// is the respective default type.
// (If the result is constant, the arguments are never
// materialized and there is nothing to do.)
check.updateExprType(args[0], typ, true)
check.updateExprType(args[1], typ, true)
}
case _Copy:
var y operand
check.expr(&y, args[1])
if y.mode == invalid {
goto Error
}
var dst, src Type
if t, ok := x.typ.Underlying().(*Slice); ok {
dst = t.elt
}
switch t := y.typ.Underlying().(type) {
case *Basic:
if isString(y.typ) {
src = Typ[Byte]
}
case *Slice:
src = t.elt
}
if dst == nil || src == nil {
check.invalidArg(x.pos(), "copy expects slice arguments; found %s and %s", x, &y)
goto Error
}
if !IsIdentical(dst, src) {
check.invalidArg(x.pos(), "arguments to copy %s and %s have different element types %s and %s", x, &y, dst, src)
goto Error
}
x.mode = value
x.typ = Typ[Int]
case _Delete:
m, ok := x.typ.Underlying().(*Map)
if !ok {
check.invalidArg(x.pos(), "%s is not a map", x)
goto Error
}
check.expr(x, args[1])
if x.mode == invalid {
goto Error
}
if !x.isAssignableTo(check.conf, m.key) {
check.invalidArg(x.pos(), "%s is not assignable to %s", x, m.key)
goto Error
}
x.mode = novalue
case _Imag, _Real:
if !isComplex(x.typ) {
check.invalidArg(x.pos(), "%s must be a complex number", x)
goto Error
}
if x.mode == constant {
if id == _Real {
x.val = exact.Real(x.val)
} else {
x.val = exact.Imag(x.val)
}
} else {
x.mode = value
}
k := Invalid
switch x.typ.Underlying().(*Basic).kind {
case Complex64:
k = Float32
case Complex128:
k = Float64
case UntypedComplex:
k = UntypedFloat
default:
unreachable()
}
x.typ = Typ[k]
case _Make:
resultTyp := check.typ(arg0, nil, false)
if resultTyp == Typ[Invalid] {
goto Error
}
var min int // minimum number of arguments
switch resultTyp.Underlying().(type) {
case *Slice:
min = 2
case *Map, *Chan:
min = 1
default:
check.invalidArg(arg0.Pos(), "cannot make %s; type must be slice, map, or channel", arg0)
goto Error
}
if n := len(args); n < min || min+1 < n {
check.errorf(call.Pos(), "%s expects %d or %d arguments; found %d", call, min, min+1, n)
goto Error
}
var sizes []int64 // constant integer arguments, if any
for _, arg := range args[1:] {
if s, ok := check.index(arg, -1); ok && s >= 0 {
sizes = append(sizes, s)
}
}
if len(sizes) == 2 && sizes[0] > sizes[1] {
check.invalidArg(args[1].Pos(), "length and capacity swapped")
// safe to continue
}
x.mode = variable
x.typ = resultTyp
case _New:
resultTyp := check.typ(arg0, nil, false)
if resultTyp == Typ[Invalid] {
goto Error
}
x.mode = variable
x.typ = &Pointer{base: resultTyp}
case _Panic:
x.mode = novalue
case _Print, _Println:
for _, arg := range args {
check.expr(x, arg)
if x.mode == invalid {
goto Error
}
}
x.mode = novalue
case _Recover:
x.mode = value
x.typ = new(Interface)
case _Alignof:
x.mode = constant
x.val = exact.MakeInt64(check.conf.alignof(x.typ))
x.typ = Typ[Uintptr]
case _Offsetof:
arg, ok := unparen(arg0).(*ast.SelectorExpr)
if !ok {
check.invalidArg(arg0.Pos(), "%s is not a selector expression", arg0)
goto Error
}
check.expr(x, arg.X)
if x.mode == invalid {
goto Error
}
base := derefStructPtr(x.typ)
sel := arg.Sel.Name
obj, index, indirect := LookupFieldOrMethod(base, check.pkg, arg.Sel.Name)
switch obj.(type) {
case nil:
check.invalidArg(x.pos(), "%s has no single field %s", base, sel)
goto Error
case *Func:
check.invalidArg(arg0.Pos(), "%s is a method value", arg0)
goto Error
}
if indirect {
check.invalidArg(x.pos(), "field %s is embedded via a pointer in %s", sel, base)
goto Error
}
// TODO(gri) Should we pass x.typ instead of base (and indirect report if derefStructPtr indirected)?
check.recordSelection(arg, FieldVal, base, obj, index, false)
offs := check.conf.offsetof(base, index)
x.mode = constant
x.val = exact.MakeInt64(offs)
x.typ = Typ[Uintptr]
case _Sizeof:
x.mode = constant
x.val = exact.MakeInt64(check.conf.sizeof(x.typ))
x.typ = Typ[Uintptr]
case _Assert:
// assert(pred) causes a typechecker error if pred is false.
// The result of assert is the value of pred if there is no error.
// Note: assert is only available in self-test mode.
if x.mode != constant || !isBoolean(x.typ) {
check.invalidArg(x.pos(), "%s is not a boolean constant", x)
goto Error
}
if x.val.Kind() != exact.Bool {
check.errorf(x.pos(), "internal error: value of %s should be a boolean constant", x)
goto Error
}
if !exact.BoolVal(x.val) {
check.errorf(call.Pos(), "%s failed", call)
// compile-time assertion failure - safe to continue
}
case _Trace:
// trace(x, y, z, ...) dumps the positions, expressions, and
// values of its arguments. The result of trace is the value
// of the first argument.
// Note: trace is only available in self-test mode.
if len(args) == 0 {
check.dump("%s: trace() without arguments", call.Pos())
x.mode = novalue
x.expr = call
return
}
var t operand
x1 := x
for _, arg := range args {
check.rawExpr(x1, arg, nil) // permit trace for types, e.g.: new(trace(T))
check.dump("%s: %s", x1.pos(), x1)
x1 = &t // use incoming x only for first argument
}
default:
unreachable()
}
x.expr = call
return
Error:
x.mode = invalid
x.expr = call
}
func Write(pkg *types.Package, out io.Writer, sizes types.Sizes) {
fmt.Fprintf(out, "package %s\n", pkg.Name())
e := &exporter{pkg: pkg, imports: make(map[*types.Package]bool), out: out}
for _, imp := range pkg.Imports() {
e.addImport(imp)
}
for _, name := range pkg.Scope().Names() {
obj := pkg.Scope().Lookup(name)
_, isTypeName := obj.(*types.TypeName)
if obj.Exported() || isTypeName {
e.toExport = append(e.toExport, obj)
}
}
for i := 0; i < len(e.toExport); i++ {
switch o := e.toExport[i].(type) {
case *types.TypeName:
fmt.Fprintf(out, "type %s %s\n", e.makeName(o), e.makeType(o.Type().Underlying()))
if _, isInterface := o.Type().Underlying().(*types.Interface); !isInterface {
writeMethods := func(t types.Type) {
methods := types.NewMethodSet(t)
for i := 0; i < methods.Len(); i++ {
m := methods.At(i)
if len(m.Index()) > 1 {
continue // method of embedded field
}
out.Write([]byte("func (? " + e.makeType(m.Recv()) + ") " + e.makeName(m.Obj()) + e.makeSignature(m.Type()) + "\n"))
}
}
writeMethods(o.Type())
writeMethods(types.NewPointer(o.Type()))
}
case *types.Func:
out.Write([]byte("func " + e.makeName(o) + e.makeSignature(o.Type()) + "\n"))
case *types.Const:
optType := ""
basic, isBasic := o.Type().(*types.Basic)
if !isBasic || basic.Info()&types.IsUntyped == 0 {
optType = " " + e.makeType(o.Type())
}
basic = o.Type().Underlying().(*types.Basic)
var val string
switch {
case basic.Info()&types.IsBoolean != 0:
val = strconv.FormatBool(exact.BoolVal(o.Val()))
case basic.Info()&types.IsInteger != 0:
if basic.Kind() == types.Uint64 {
d, _ := exact.Uint64Val(o.Val())
val = fmt.Sprintf("%#x", d)
break
}
d, _ := exact.Int64Val(o.Val())
if basic.Kind() == types.UntypedRune {
switch {
case d < 0 || d > unicode.MaxRune:
val = fmt.Sprintf("('\\x00' + %d)", d)
case d > 0xffff:
val = fmt.Sprintf("'\\U%08x'", d)
default:
val = fmt.Sprintf("'\\u%04x'", d)
}
break
}
val = fmt.Sprintf("%#x", d)
case basic.Info()&types.IsFloat != 0:
f, _ := exact.Float64Val(o.Val())
val = strconv.FormatFloat(f, 'b', -1, 64)
case basic.Info()&types.IsComplex != 0:
r, _ := exact.Float64Val(exact.Real(o.Val()))
i, _ := exact.Float64Val(exact.Imag(o.Val()))
val = fmt.Sprintf("(%s+%si)", strconv.FormatFloat(r, 'b', -1, 64), strconv.FormatFloat(i, 'b', -1, 64))
case basic.Info()&types.IsString != 0:
val = fmt.Sprintf("%#v", exact.StringVal(o.Val()))
default:
panic("Unhandled constant type: " + basic.String())
}
out.Write([]byte("const " + e.makeName(o) + optType + " = " + val + "\n"))
case *types.Var:
out.Write([]byte("var " + e.makeName(o) + " " + e.makeType(o.Type()) + "\n"))
default:
panic(fmt.Sprintf("Unhandled object: %T\n", o))
}
}
fmt.Fprintf(out, "$$\n")
}