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Source file test/method5.go

Documentation: test

     1  // run
     2  
     3  // Copyright 2013 The Go Authors. All rights reserved.
     4  // Use of this source code is governed by a BSD-style
     5  // license that can be found in the LICENSE file.
     6  
     7  package main
     8  
     9  // Concrete types implementing M method.
    10  // Smaller than a word, word-sized, larger than a word.
    11  // Value and pointer receivers.
    12  
    13  type Tinter interface {
    14  	M(int, byte) (byte, int)
    15  }
    16  
    17  type Tsmallv byte
    18  
    19  func (v Tsmallv) M(x int, b byte) (byte, int) { return b, x+int(v) }
    20  
    21  type Tsmallp byte
    22  
    23  func (p *Tsmallp) M(x int, b byte) (byte, int) { return b, x+int(*p) }
    24  
    25  type Twordv uintptr
    26  
    27  func (v Twordv) M(x int, b byte) (byte, int) { return b, x+int(v) }
    28  
    29  type Twordp uintptr
    30  
    31  func (p *Twordp) M(x int, b byte) (byte, int) { return b, x+int(*p) }
    32  
    33  type Tbigv [2]uintptr
    34  
    35  func (v Tbigv) M(x int, b byte) (byte, int) { return b, x+int(v[0])+int(v[1]) }
    36  
    37  type Tbigp [2]uintptr
    38  
    39  func (p *Tbigp) M(x int, b byte) (byte, int) { return b, x+int(p[0])+int(p[1]) }
    40  
    41  // Again, with an unexported method.
    42  
    43  type tsmallv byte
    44  
    45  func (v tsmallv) m(x int, b byte) (byte, int) { return b, x+int(v) }
    46  
    47  type tsmallp byte
    48  
    49  func (p *tsmallp) m(x int, b byte) (byte, int) { return b, x+int(*p) }
    50  
    51  type twordv uintptr
    52  
    53  func (v twordv) m(x int, b byte) (byte, int) { return b, x+int(v) }
    54  
    55  type twordp uintptr
    56  
    57  func (p *twordp) m(x int, b byte) (byte, int) { return b, x+int(*p) }
    58  
    59  type tbigv [2]uintptr
    60  
    61  func (v tbigv) m(x int, b byte) (byte, int) { return b, x+int(v[0])+int(v[1]) }
    62  
    63  type tbigp [2]uintptr
    64  
    65  func (p *tbigp) m(x int, b byte) (byte, int) { return b, x+int(p[0])+int(p[1]) }
    66  
    67  type tinter interface {
    68  	m(int, byte) (byte, int)
    69  }
    70  
    71  // Embedding via pointer.
    72  
    73  type T1 struct {
    74  	T2
    75  }
    76  
    77  type T2 struct {
    78  	*T3
    79  }
    80  
    81  type T3 struct {
    82  	*T4
    83  }
    84  
    85  type T4 struct {
    86  }
    87  
    88  func (t4 T4) M(x int, b byte) (byte, int) { return b, x+40 }
    89  
    90  var failed = false
    91  
    92  func CheckI(name string, i Tinter, inc int) {
    93  	b, x := i.M(1000, 99)
    94  	if b != 99 || x != 1000+inc {
    95  		failed = true
    96  		print(name, ".M(1000, 99) = ", b, ", ", x, " want 99, ", 1000+inc, "\n")
    97  	}
    98  	
    99  	CheckF("(i="+name+")", i.M, inc)
   100  }
   101  
   102  func CheckF(name string, f func(int, byte) (byte, int), inc int) {
   103  	b, x := f(1000, 99)
   104  	if b != 99 || x != 1000+inc {
   105  		failed = true
   106  		print(name, "(1000, 99) = ", b, ", ", x, " want 99, ", 1000+inc, "\n")
   107  	}
   108  }
   109  
   110  func checkI(name string, i tinter, inc int) {
   111  	b, x := i.m(1000, 99)
   112  	if b != 99 || x != 1000+inc {
   113  		failed = true
   114  		print(name, ".m(1000, 99) = ", b, ", ", x, " want 99, ", 1000+inc, "\n")
   115  	}
   116  	
   117  	checkF("(i="+name+")", i.m, inc)
   118  }
   119  
   120  func checkF(name string, f func(int, byte) (byte, int), inc int) {
   121  	b, x := f(1000, 99)
   122  	if b != 99 || x != 1000+inc {
   123  		failed = true
   124  		print(name, "(1000, 99) = ", b, ", ", x, " want 99, ", 1000+inc, "\n")
   125  	}
   126  }
   127  
   128  func shouldPanic(f func()) {
   129  	defer func() {
   130  		if recover() == nil {
   131  			panic("not panicking")
   132  		}
   133  	}()
   134  	f()
   135  }
   136  
   137  func shouldNotPanic(f func()) {
   138  	f()
   139  }
   140  
   141  func main() {
   142  	sv := Tsmallv(1)
   143  	CheckI("sv", sv, 1)
   144  	CheckF("sv.M", sv.M, 1)
   145  	CheckF("(&sv).M", (&sv).M, 1)
   146  	psv := &sv
   147  	CheckI("psv", psv, 1)
   148  	CheckF("psv.M", psv.M, 1)
   149  	CheckF("(*psv).M", (*psv).M, 1)
   150  
   151  	sp := Tsmallp(2)
   152  	CheckI("&sp", &sp, 2)
   153  	CheckF("sp.M", sp.M, 2)
   154  	CheckF("(&sp).M", (&sp).M, 2)
   155  	psp := &sp
   156  	CheckI("psp", psp, 2)
   157  	CheckF("psp.M", psp.M, 2)
   158  	CheckF("(*psp).M", (*psp).M, 2)
   159  
   160  	wv := Twordv(3)
   161  	CheckI("wv", wv, 3)
   162  	CheckF("wv.M", wv.M, 3)
   163  	CheckF("(&wv).M", (&wv).M, 3)
   164  	pwv := &wv
   165  	CheckI("pwv", pwv, 3)
   166  	CheckF("pwv.M", pwv.M, 3)
   167  	CheckF("(*pwv).M", (*pwv).M, 3)
   168  
   169  	wp := Twordp(4)
   170  	CheckI("&wp", &wp, 4)
   171  	CheckF("wp.M", wp.M, 4)
   172  	CheckF("(&wp).M", (&wp).M, 4)
   173  	pwp := &wp
   174  	CheckI("pwp", pwp, 4)
   175  	CheckF("pwp.M", pwp.M, 4)
   176  	CheckF("(*pwp).M", (*pwp).M, 4)
   177  
   178  	bv := Tbigv([2]uintptr{5, 6})
   179  	pbv := &bv
   180  	CheckI("bv", bv, 11)
   181  	CheckF("bv.M", bv.M, 11)
   182  	CheckF("(&bv).M", (&bv).M, 11)
   183  	CheckI("pbv", pbv, 11)
   184  	CheckF("pbv.M", pbv.M, 11)
   185  	CheckF("(*pbv).M", (*pbv).M, 11)
   186  	
   187  	bp := Tbigp([2]uintptr{7,8})
   188  	CheckI("&bp", &bp, 15)
   189  	CheckF("bp.M", bp.M, 15)
   190  	CheckF("(&bp).M", (&bp).M, 15)
   191  	pbp := &bp
   192  	CheckI("pbp", pbp, 15)
   193  	CheckF("pbp.M", pbp.M, 15)
   194  	CheckF("(*pbp).M", (*pbp).M, 15)
   195  
   196  	_sv := tsmallv(1)
   197  	checkI("_sv", _sv, 1)
   198  	checkF("_sv.m", _sv.m, 1)
   199  	checkF("(&_sv).m", (&_sv).m, 1)
   200  	_psv := &_sv
   201  	checkI("_psv", _psv, 1)
   202  	checkF("_psv.m", _psv.m, 1)
   203  	checkF("(*_psv).m", (*_psv).m, 1)
   204  
   205  	_sp := tsmallp(2)
   206  	checkI("&_sp", &_sp, 2)
   207  	checkF("_sp.m", _sp.m, 2)
   208  	checkF("(&_sp).m", (&_sp).m, 2)
   209  	_psp := &_sp
   210  	checkI("_psp", _psp, 2)
   211  	checkF("_psp.m", _psp.m, 2)
   212  	checkF("(*_psp).m", (*_psp).m, 2)
   213  
   214  	_wv := twordv(3)
   215  	checkI("_wv", _wv, 3)
   216  	checkF("_wv.m", _wv.m, 3)
   217  	checkF("(&_wv).m", (&_wv).m, 3)
   218  	_pwv := &_wv
   219  	checkI("_pwv", _pwv, 3)
   220  	checkF("_pwv.m", _pwv.m, 3)
   221  	checkF("(*_pwv).m", (*_pwv).m, 3)
   222  
   223  	_wp := twordp(4)
   224  	checkI("&_wp", &_wp, 4)
   225  	checkF("_wp.m", _wp.m, 4)
   226  	checkF("(&_wp).m", (&_wp).m, 4)
   227  	_pwp := &_wp
   228  	checkI("_pwp", _pwp, 4)
   229  	checkF("_pwp.m", _pwp.m, 4)
   230  	checkF("(*_pwp).m", (*_pwp).m, 4)
   231  
   232  	_bv := tbigv([2]uintptr{5, 6})
   233  	_pbv := &_bv
   234  	checkI("_bv", _bv, 11)
   235  	checkF("_bv.m", _bv.m, 11)
   236  	checkF("(&_bv).m", (&_bv).m, 11)
   237  	checkI("_pbv", _pbv, 11)
   238  	checkF("_pbv.m", _pbv.m, 11)
   239  	checkF("(*_pbv).m", (*_pbv).m, 11)
   240  	
   241  	_bp := tbigp([2]uintptr{7,8})
   242  	checkI("&_bp", &_bp, 15)
   243  	checkF("_bp.m", _bp.m, 15)
   244  	checkF("(&_bp).m", (&_bp).m, 15)
   245  	_pbp := &_bp
   246  	checkI("_pbp", _pbp, 15)
   247  	checkF("_pbp.m", _pbp.m, 15)
   248  	checkF("(*_pbp).m", (*_pbp).m, 15)
   249  	
   250  	t4 := T4{}
   251  	t3 := T3{&t4}
   252  	t2 := T2{&t3}
   253  	t1 := T1{t2}
   254  	CheckI("t4", t4, 40)
   255  	CheckI("&t4", &t4, 40)
   256  	CheckI("t3", t3, 40)
   257  	CheckI("&t3", &t3, 40)
   258  	CheckI("t2", t2, 40)
   259  	CheckI("&t2", &t2, 40)
   260  	CheckI("t1", t1, 40)
   261  	CheckI("&t1", &t1, 40)
   262  	
   263  	// x.M panics if x is an interface type and is nil,
   264  	// or if x.M expands to (*x).M where x is nil,
   265  	// or if x.M expands to x.y.z.w.M where something
   266  	// along the evaluation of x.y.z.w is nil.
   267  	var f func(int, byte) (byte, int)
   268  	shouldPanic(func() { psv = nil; f = psv.M })
   269  	shouldPanic(func() { pwv = nil; f = pwv.M })
   270  	shouldPanic(func() { pbv = nil; f = pbv.M })
   271  	shouldPanic(func() { var i Tinter; f = i.M })
   272  	shouldPanic(func() { _psv = nil; f = _psv.m })
   273  	shouldPanic(func() { _pwv = nil; f = _pwv.m })
   274  	shouldPanic(func() { _pbv = nil; f = _pbv.m })
   275  	shouldPanic(func() { var _i tinter; f = _i.m })
   276  	shouldPanic(func() { var t1 T1; f = t1.M })
   277  	shouldPanic(func() { var t2 T2; f = t2.M })
   278  	shouldPanic(func() { var t3 *T3; f = t3.M })
   279  	shouldPanic(func() { var t3 T3; f = t3.M })
   280  
   281  	if f != nil {
   282  		panic("something set f")
   283  	}
   284  	
   285  	// x.M does not panic if x is a nil pointer and
   286  	// M is a method with a pointer receiver.
   287  	shouldNotPanic(func() { psp = nil; f = psp.M })
   288  	shouldNotPanic(func() { pwp = nil; f = pwp.M })
   289  	shouldNotPanic(func() { pbp = nil; f = pbp.M })
   290  	shouldNotPanic(func() { _psp = nil; f = _psp.m })
   291  	shouldNotPanic(func() { _pwp = nil; f = _pwp.m })
   292  	shouldNotPanic(func() { _pbp = nil; f = _pbp.m })
   293  	shouldNotPanic(func() { var t4 T4; f = t4.M })
   294  	if f == nil {
   295  		panic("nothing set f")
   296  	}
   297  }
   298  

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