rangevarlifetime_go122.go

Documentation: golang.org/x/tools/go/ssa/interp/testdata

     1  // Copyright 2023 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  //go:build go1.22
     6  
     7  package main
     8  
     9  func main() {
    10  	test_init()
    11  
    12  	// Clones from cmd/compile/internal/loopvar/testdata .
    13  	range_esc_address()
    14  	range_esc_closure()
    15  	range_esc_method()
    16  }
    17  
    18  // After go1.22, each i will have a distinct address.
    19  var distinct = func(a [3]int) []*int {
    20  	var r []*int
    21  	for i := range a {
    22  		r = append(r, &i)
    23  	}
    24  	return r
    25  }([3]int{})
    26  
    27  func test_init() {
    28  	if len(distinct) != 3 {
    29  		panic(distinct)
    30  	}
    31  	for i := 0; i < 3; i++ {
    32  		if i != *(distinct[i]) {
    33  			panic(distinct)
    34  		}
    35  	}
    36  }
    37  
    38  func range_esc_address() {
    39  	// Clone of range_esc_address.go
    40  	ints := []int{0, 1, 2, 3, 4, 5, 6, 7, 8, 9}
    41  
    42  	sum := 0
    43  	var is []*int
    44  	for _, i := range ints {
    45  		for j := 0; j < 10; j++ {
    46  			if i == j { // 10 skips
    47  				continue
    48  			}
    49  			sum++
    50  		}
    51  		if i&1 == 0 {
    52  			is = append(is, &i)
    53  		}
    54  	}
    55  
    56  	bug := false
    57  	if sum != 100-10 {
    58  		println("wrong sum, expected", 90, ", saw ", sum)
    59  		bug = true
    60  	}
    61  	if len(is) != 5 {
    62  		println("wrong iterations, expected ", 5, ", saw", len(is))
    63  		bug = true
    64  	}
    65  	sum = 0
    66  	for _, pi := range is {
    67  		sum += *pi
    68  	}
    69  	if sum != 0+2+4+6+8 {
    70  		println("wrong sum, expected", 20, ", saw", sum)
    71  		bug = true
    72  	}
    73  	if bug {
    74  		panic("range_esc_address")
    75  	}
    76  }
    77  
    78  func range_esc_closure() {
    79  	// Clone of range_esc_closure.go
    80  	var ints = []int{0, 1, 2, 3, 4, 5, 6, 7, 8, 9}
    81  	var is []func() int
    82  
    83  	sum := 0
    84  	for _, i := range ints {
    85  		for j := 0; j < 10; j++ {
    86  			if i == j { // 10 skips
    87  				continue
    88  			}
    89  			sum++
    90  		}
    91  		if i&1 == 0 {
    92  			is = append(is, func() int {
    93  				if i%17 == 15 {
    94  					i++
    95  				}
    96  				return i
    97  			})
    98  		}
    99  	}
   100  
   101  	bug := false
   102  	if sum != 100-10 {
   103  		println("wrong sum, expected", 90, ", saw", sum)
   104  		bug = true
   105  	}
   106  	if len(is) != 5 {
   107  		println("wrong iterations, expected ", 5, ", saw", len(is))
   108  		bug = true
   109  	}
   110  	sum = 0
   111  	for _, f := range is {
   112  		sum += f()
   113  	}
   114  	if sum != 0+2+4+6+8 {
   115  		println("wrong sum, expected ", 20, ", saw ", sum)
   116  		bug = true
   117  	}
   118  	if bug {
   119  		panic("range_esc_closure")
   120  	}
   121  }
   122  
   123  type I int
   124  
   125  func (x *I) method() int {
   126  	return int(*x)
   127  }
   128  
   129  func range_esc_method() {
   130  	// Clone of range_esc_method.go
   131  	var ints = []I{0, 1, 2, 3, 4, 5, 6, 7, 8, 9}
   132  
   133  	sum := 0
   134  	var is []func() int
   135  	for _, i := range ints {
   136  		for j := 0; j < 10; j++ {
   137  			if int(i) == j { // 10 skips
   138  				continue
   139  			}
   140  			sum++
   141  		}
   142  		if i&1 == 0 {
   143  			is = append(is, i.method)
   144  		}
   145  	}
   146  
   147  	bug := false
   148  	if sum != 100-10 {
   149  		println("wrong sum, expected", 90, ", saw", sum)
   150  		bug = true
   151  	}
   152  	if len(is) != 5 {
   153  		println("wrong iterations, expected ", 5, ", saw", len(is))
   154  		bug = true
   155  	}
   156  	sum = 0
   157  	for _, m := range is {
   158  		sum += m()
   159  	}
   160  	if sum != 0+2+4+6+8 {
   161  		println("wrong sum, expected ", 20, ", saw ", sum)
   162  		bug = true
   163  	}
   164  	if bug {
   165  		panic("range_esc_method")
   166  	}
   167  }
   168
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