| // run |
| |
| // Copyright 2013 The Go Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style |
| // license that can be found in the LICENSE file. |
| |
| package main |
| |
| // Concrete types implementing M method. |
| // Smaller than a word, word-sized, larger than a word. |
| // Value and pointer receivers. |
| |
| type Tinter interface { |
| M(int, byte) (byte, int) |
| } |
| |
| type Tsmallv byte |
| |
| func (v Tsmallv) M(x int, b byte) (byte, int) { return b, x+int(v) } |
| |
| type Tsmallp byte |
| |
| func (p *Tsmallp) M(x int, b byte) (byte, int) { return b, x+int(*p) } |
| |
| type Twordv uintptr |
| |
| func (v Twordv) M(x int, b byte) (byte, int) { return b, x+int(v) } |
| |
| type Twordp uintptr |
| |
| func (p *Twordp) M(x int, b byte) (byte, int) { return b, x+int(*p) } |
| |
| type Tbigv [2]uintptr |
| |
| func (v Tbigv) M(x int, b byte) (byte, int) { return b, x+int(v[0])+int(v[1]) } |
| |
| type Tbigp [2]uintptr |
| |
| func (p *Tbigp) M(x int, b byte) (byte, int) { return b, x+int(p[0])+int(p[1]) } |
| |
| // Again, with an unexported method. |
| |
| type tsmallv byte |
| |
| func (v tsmallv) m(x int, b byte) (byte, int) { return b, x+int(v) } |
| |
| type tsmallp byte |
| |
| func (p *tsmallp) m(x int, b byte) (byte, int) { return b, x+int(*p) } |
| |
| type twordv uintptr |
| |
| func (v twordv) m(x int, b byte) (byte, int) { return b, x+int(v) } |
| |
| type twordp uintptr |
| |
| func (p *twordp) m(x int, b byte) (byte, int) { return b, x+int(*p) } |
| |
| type tbigv [2]uintptr |
| |
| func (v tbigv) m(x int, b byte) (byte, int) { return b, x+int(v[0])+int(v[1]) } |
| |
| type tbigp [2]uintptr |
| |
| func (p *tbigp) m(x int, b byte) (byte, int) { return b, x+int(p[0])+int(p[1]) } |
| |
| type tinter interface { |
| m(int, byte) (byte, int) |
| } |
| |
| // Embedding via pointer. |
| |
| type T1 struct { |
| T2 |
| } |
| |
| type T2 struct { |
| *T3 |
| } |
| |
| type T3 struct { |
| *T4 |
| } |
| |
| type T4 struct { |
| } |
| |
| func (t4 T4) M(x int, b byte) (byte, int) { return b, x+40 } |
| |
| var failed = false |
| |
| func CheckI(name string, i Tinter, inc int) { |
| b, x := i.M(1000, 99) |
| if b != 99 || x != 1000+inc { |
| failed = true |
| print(name, ".M(1000, 99) = ", b, ", ", x, " want 99, ", 1000+inc, "\n") |
| } |
| |
| CheckF("(i="+name+")", i.M, inc) |
| } |
| |
| func CheckF(name string, f func(int, byte) (byte, int), inc int) { |
| b, x := f(1000, 99) |
| if b != 99 || x != 1000+inc { |
| failed = true |
| print(name, "(1000, 99) = ", b, ", ", x, " want 99, ", 1000+inc, "\n") |
| } |
| } |
| |
| func checkI(name string, i tinter, inc int) { |
| b, x := i.m(1000, 99) |
| if b != 99 || x != 1000+inc { |
| failed = true |
| print(name, ".m(1000, 99) = ", b, ", ", x, " want 99, ", 1000+inc, "\n") |
| } |
| |
| checkF("(i="+name+")", i.m, inc) |
| } |
| |
| func checkF(name string, f func(int, byte) (byte, int), inc int) { |
| b, x := f(1000, 99) |
| if b != 99 || x != 1000+inc { |
| failed = true |
| print(name, "(1000, 99) = ", b, ", ", x, " want 99, ", 1000+inc, "\n") |
| } |
| } |
| |
| func shouldPanic(f func()) { |
| defer func() { |
| if recover() == nil { |
| panic("not panicking") |
| } |
| }() |
| f() |
| } |
| |
| func shouldNotPanic(f func()) { |
| f() |
| } |
| |
| func main() { |
| sv := Tsmallv(1) |
| CheckI("sv", sv, 1) |
| CheckF("sv.M", sv.M, 1) |
| CheckF("(&sv).M", (&sv).M, 1) |
| psv := &sv |
| CheckI("psv", psv, 1) |
| CheckF("psv.M", psv.M, 1) |
| CheckF("(*psv).M", (*psv).M, 1) |
| |
| sp := Tsmallp(2) |
| CheckI("&sp", &sp, 2) |
| CheckF("sp.M", sp.M, 2) |
| CheckF("(&sp).M", (&sp).M, 2) |
| psp := &sp |
| CheckI("psp", psp, 2) |
| CheckF("psp.M", psp.M, 2) |
| CheckF("(*psp).M", (*psp).M, 2) |
| |
| wv := Twordv(3) |
| CheckI("wv", wv, 3) |
| CheckF("wv.M", wv.M, 3) |
| CheckF("(&wv).M", (&wv).M, 3) |
| pwv := &wv |
| CheckI("pwv", pwv, 3) |
| CheckF("pwv.M", pwv.M, 3) |
| CheckF("(*pwv).M", (*pwv).M, 3) |
| |
| wp := Twordp(4) |
| CheckI("&wp", &wp, 4) |
| CheckF("wp.M", wp.M, 4) |
| CheckF("(&wp).M", (&wp).M, 4) |
| pwp := &wp |
| CheckI("pwp", pwp, 4) |
| CheckF("pwp.M", pwp.M, 4) |
| CheckF("(*pwp).M", (*pwp).M, 4) |
| |
| bv := Tbigv([2]uintptr{5, 6}) |
| pbv := &bv |
| CheckI("bv", bv, 11) |
| CheckF("bv.M", bv.M, 11) |
| CheckF("(&bv).M", (&bv).M, 11) |
| CheckI("pbv", pbv, 11) |
| CheckF("pbv.M", pbv.M, 11) |
| CheckF("(*pbv).M", (*pbv).M, 11) |
| |
| bp := Tbigp([2]uintptr{7,8}) |
| CheckI("&bp", &bp, 15) |
| CheckF("bp.M", bp.M, 15) |
| CheckF("(&bp).M", (&bp).M, 15) |
| pbp := &bp |
| CheckI("pbp", pbp, 15) |
| CheckF("pbp.M", pbp.M, 15) |
| CheckF("(*pbp).M", (*pbp).M, 15) |
| |
| _sv := tsmallv(1) |
| checkI("_sv", _sv, 1) |
| checkF("_sv.m", _sv.m, 1) |
| checkF("(&_sv).m", (&_sv).m, 1) |
| _psv := &_sv |
| checkI("_psv", _psv, 1) |
| checkF("_psv.m", _psv.m, 1) |
| checkF("(*_psv).m", (*_psv).m, 1) |
| |
| _sp := tsmallp(2) |
| checkI("&_sp", &_sp, 2) |
| checkF("_sp.m", _sp.m, 2) |
| checkF("(&_sp).m", (&_sp).m, 2) |
| _psp := &_sp |
| checkI("_psp", _psp, 2) |
| checkF("_psp.m", _psp.m, 2) |
| checkF("(*_psp).m", (*_psp).m, 2) |
| |
| _wv := twordv(3) |
| checkI("_wv", _wv, 3) |
| checkF("_wv.m", _wv.m, 3) |
| checkF("(&_wv).m", (&_wv).m, 3) |
| _pwv := &_wv |
| checkI("_pwv", _pwv, 3) |
| checkF("_pwv.m", _pwv.m, 3) |
| checkF("(*_pwv).m", (*_pwv).m, 3) |
| |
| _wp := twordp(4) |
| checkI("&_wp", &_wp, 4) |
| checkF("_wp.m", _wp.m, 4) |
| checkF("(&_wp).m", (&_wp).m, 4) |
| _pwp := &_wp |
| checkI("_pwp", _pwp, 4) |
| checkF("_pwp.m", _pwp.m, 4) |
| checkF("(*_pwp).m", (*_pwp).m, 4) |
| |
| _bv := tbigv([2]uintptr{5, 6}) |
| _pbv := &_bv |
| checkI("_bv", _bv, 11) |
| checkF("_bv.m", _bv.m, 11) |
| checkF("(&_bv).m", (&_bv).m, 11) |
| checkI("_pbv", _pbv, 11) |
| checkF("_pbv.m", _pbv.m, 11) |
| checkF("(*_pbv).m", (*_pbv).m, 11) |
| |
| _bp := tbigp([2]uintptr{7,8}) |
| checkI("&_bp", &_bp, 15) |
| checkF("_bp.m", _bp.m, 15) |
| checkF("(&_bp).m", (&_bp).m, 15) |
| _pbp := &_bp |
| checkI("_pbp", _pbp, 15) |
| checkF("_pbp.m", _pbp.m, 15) |
| checkF("(*_pbp).m", (*_pbp).m, 15) |
| |
| t4 := T4{} |
| t3 := T3{&t4} |
| t2 := T2{&t3} |
| t1 := T1{t2} |
| CheckI("t4", t4, 40) |
| CheckI("&t4", &t4, 40) |
| CheckI("t3", t3, 40) |
| CheckI("&t3", &t3, 40) |
| CheckI("t2", t2, 40) |
| CheckI("&t2", &t2, 40) |
| CheckI("t1", t1, 40) |
| CheckI("&t1", &t1, 40) |
| |
| // x.M panics if x is an interface type and is nil, |
| // or if x.M expands to (*x).M where x is nil, |
| // or if x.M expands to x.y.z.w.M where something |
| // along the evaluation of x.y.z.w is nil. |
| var f func(int, byte) (byte, int) |
| shouldPanic(func() { psv = nil; f = psv.M }) |
| shouldPanic(func() { pwv = nil; f = pwv.M }) |
| shouldPanic(func() { pbv = nil; f = pbv.M }) |
| shouldPanic(func() { var i Tinter; f = i.M }) |
| shouldPanic(func() { _psv = nil; f = _psv.m }) |
| shouldPanic(func() { _pwv = nil; f = _pwv.m }) |
| shouldPanic(func() { _pbv = nil; f = _pbv.m }) |
| shouldPanic(func() { var _i tinter; f = _i.m }) |
| shouldPanic(func() { var t1 T1; f = t1.M }) |
| shouldPanic(func() { var t2 T2; f = t2.M }) |
| shouldPanic(func() { var t3 *T3; f = t3.M }) |
| shouldPanic(func() { var t3 T3; f = t3.M }) |
| |
| if f != nil { |
| panic("something set f") |
| } |
| |
| // x.M does not panic if x is a nil pointer and |
| // M is a method with a pointer receiver. |
| shouldNotPanic(func() { psp = nil; f = psp.M }) |
| shouldNotPanic(func() { pwp = nil; f = pwp.M }) |
| shouldNotPanic(func() { pbp = nil; f = pbp.M }) |
| shouldNotPanic(func() { _psp = nil; f = _psp.m }) |
| shouldNotPanic(func() { _pwp = nil; f = _pwp.m }) |
| shouldNotPanic(func() { _pbp = nil; f = _pbp.m }) |
| shouldNotPanic(func() { var t4 T4; f = t4.M }) |
| if f == nil { |
| panic("nothing set f") |
| } |
| } |
