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All rights reserved. // Use of this source code is governed by a BSD-style // license that can be found in the LICENSE file. // Test that many initializations can be done at link time and // generate no executable init functions. // Also test that trivial func init are optimized away. package main import ( "errors" "unsafe" ) // All these initializations should be done at link time. type S struct{ a, b, c int } type SS struct{ aa, bb, cc S } type SA struct{ a, b, c [3]int } type SC struct{ a, b, c []int } var ( zero = 2 one = 1 pi = 3.14 slice = []byte{1, 2, 3} sliceInt = []int{1, 2, 3} hello = "hello, world" bytes = []byte("hello, world") four, five = 4, 5 x, y = 0.1, "hello" nilslice []byte = nil nilmap map[string]int = nil nilfunc func() = nil nilchan chan int = nil nilptr *byte = nil ) var a = [3]int{1001, 1002, 1003} var s = S{1101, 1102, 1103} var c = []int{1201, 1202, 1203} var aa = [3][3]int{[3]int{2001, 2002, 2003}, [3]int{2004, 2005, 2006}, [3]int{2007, 2008, 2009}} var as = [3]S{S{2101, 2102, 2103}, S{2104, 2105, 2106}, S{2107, 2108, 2109}} var sa = SA{[3]int{3001, 3002, 3003}, [3]int{3004, 3005, 3006}, [3]int{3007, 3008, 3009}} var ss = SS{S{3101, 3102, 3103}, S{3104, 3105, 3106}, S{3107, 3108, 3109}} var ca = [][3]int{[3]int{4001, 4002, 4003}, [3]int{4004, 4005, 4006}, [3]int{4007, 4008, 4009}} var cs = []S{S{4101, 4102, 4103}, S{4104, 4105, 4106}, S{4107, 4108, 4109}} var answers = [...]int{ // s 1101, 1102, 1103, // ss 3101, 3102, 3103, 3104, 3105, 3106, 3107, 3108, 3109, // [0] 1001, 1201, 1301, 2101, 2102, 2103, 4101, 4102, 4103, 5101, 5102, 5103, 3001, 3004, 3007, 3201, 3204, 3207, 3301, 3304, 3307, // [0][j] 2001, 2201, 2301, 4001, 4201, 4301, 5001, 5201, 5301, 2002, 2202, 2302, 4002, 4202, 4302, 5002, 5202, 5302, 2003, 2203, 2303, 4003, 4203, 4303, 5003, 5203, 5303, // [1] 1002, 1202, 1302, 2104, 2105, 2106, 4104, 4105, 4106, 5104, 5105, 5106, 3002, 3005, 3008, 3202, 3205, 3208, 3302, 3305, 3308, // [1][j] 2004, 2204, 2304, 4004, 4204, 4304, 5004, 5204, 5304, 2005, 2205, 2305, 4005, 4205, 4305, 5005, 5205, 5305, 2006, 2206, 2306, 4006, 4206, 4306, 5006, 5206, 5306, // [2] 1003, 1203, 1303, 2107, 2108, 2109, 4107, 4108, 4109, 5107, 5108, 5109, 3003, 3006, 3009, 3203, 3206, 3209, 3303, 3306, 3309, // [2][j] 2007, 2207, 2307, 4007, 4207, 4307, 5007, 5207, 5307, 2008, 2208, 2308, 4008, 4208, 4308, 5008, 5208, 5308, 2009, 2209, 2309, 4009, 4209, 4309, 5009, 5209, 5309, } var ( copy_zero = zero copy_one = one copy_pi = pi copy_slice = slice copy_sliceInt = sliceInt // copy_hello = hello // static init of copied strings defeats link -X; see #34675 // Could be handled without an initialization function, but // requires special handling for "a = []byte("..."); b = a" // which is not a likely case. // copy_bytes = bytes // https://codereview.appspot.com/171840043 is one approach to // make this special case work. copy_four, copy_five = four, five copy_x = x // copy_y = y // static init of copied strings defeats link -X; see #34675 copy_nilslice = nilslice copy_nilmap = nilmap copy_nilfunc = nilfunc copy_nilchan = nilchan copy_nilptr = nilptr ) var copy_a = a var copy_s = s var copy_c = c var copy_aa = aa var copy_as = as var copy_sa = sa var copy_ss = ss var copy_ca = ca var copy_cs = cs var copy_answers = answers var bx bool var b0 = false var b1 = true var fx float32 var f0 = float32(0) var f1 = float32(1) var gx float64 var g0 = float64(0) var g1 = float64(1) var ix int var i0 = 0 var i1 = 1 var jx uint var j0 = uint(0) var j1 = uint(1) var cx complex64 var c0 = complex64(0) var c1 = complex64(1) var dx complex128 var d0 = complex128(0) var d1 = complex128(1) var sx []int var s0 = []int{0, 0, 0} var s1 = []int{1, 2, 3} func fi() int { return 1 } var ax [10]int var a0 = [10]int{0, 0, 0} var a1 = [10]int{1, 2, 3, 4} type T struct{ X, Y int } var tx T var t0 = T{} var t0a = T{0, 0} var t0b = T{X: 0} var t1 = T{X: 1, Y: 2} var t1a = T{3, 4} var psx *[]int var ps0 = &[]int{0, 0, 0} var ps1 = &[]int{1, 2, 3} var pax *[10]int var pa0 = &[10]int{0, 0, 0} var pa1 = &[10]int{1, 2, 3} var ptx *T var pt0 = &T{} var pt0a = &T{0, 0} var pt0b = &T{X: 0} var pt1 = &T{X: 1, Y: 2} var pt1a = &T{3, 4} // The checks similar to // var copy_bx = bx // are commented out. The compiler no longer statically initializes them. // See issue 7665 and https://codereview.appspot.com/93200044. // If https://codereview.appspot.com/169040043 is submitted, and this // test is changed to pass -complete to the compiler, then we can // uncomment the copy lines again. // var copy_bx = bx var copy_b0 = b0 var copy_b1 = b1 // var copy_fx = fx var copy_f0 = f0 var copy_f1 = f1 // var copy_gx = gx var copy_g0 = g0 var copy_g1 = g1 // var copy_ix = ix var copy_i0 = i0 var copy_i1 = i1 // var copy_jx = jx var copy_j0 = j0 var copy_j1 = j1 // var copy_cx = cx var copy_c0 = c0 var copy_c1 = c1 // var copy_dx = dx var copy_d0 = d0 var copy_d1 = d1 // var copy_sx = sx var copy_s0 = s0 var copy_s1 = s1 // var copy_ax = ax var copy_a0 = a0 var copy_a1 = a1 // var copy_tx = tx var copy_t0 = t0 var copy_t0a = t0a var copy_t0b = t0b var copy_t1 = t1 var copy_t1a = t1a // var copy_psx = psx var copy_ps0 = ps0 var copy_ps1 = ps1 // var copy_pax = pax var copy_pa0 = pa0 var copy_pa1 = pa1 // var copy_ptx = ptx var copy_pt0 = pt0 var copy_pt0a = pt0a var copy_pt0b = pt0b var copy_pt1 = pt1 var copy_pt1a = pt1a var _ interface{} = 1 type T1 int func (t *T1) M() {} type Mer interface { M() } var _ Mer = (*T1)(nil) var Byte byte var PtrByte unsafe.Pointer = unsafe.Pointer(&Byte) var LitSXInit = &S{1, 2, 3} var LitSAnyXInit any = &S{4, 5, 6} func FS(x, y, z int) *S { return &S{x, y, z} } func FSA(x, y, z int) any { return &S{x, y, z} } func F3(x int) *S { return &S{x, x, x} } var LitSCallXInit = FS(7, 8, 9) var LitSAnyCallXInit any = FSA(10, 11, 12) var LitSRepeat = F3(1 + 2) func F0() *S { return &S{1, 2, 3} } var LitSNoArgs = F0() var myError = errors.New("mine") func gopherize(s string) string { return "gopher gopher gopher " + s } var animals = gopherize("badger") // These init funcs should optimize away. func init() { } func init() { if false { } } func init() { for false { } } // Actual test: check for init funcs in runtime data structures. type initTask struct { state uint32 nfns uint32 } //go:linkname main_inittask main..inittask var main_inittask initTask func main() { if nfns := main_inittask.nfns; nfns != 0 { println(nfns) panic("unexpected init funcs") } }