cmd/gc: implement method values
R=ken2, ken
CC=golang-dev
https://golang.org/cl/7546052
diff --git a/test/method5.go b/test/method5.go
new file mode 100644
index 0000000..36508f2
--- /dev/null
+++ b/test/method5.go
@@ -0,0 +1,297 @@
+// 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")
+ }
+}
