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