issue20780b.go

     1  // run -race
     2  
     3  //go:build cgo && linux && amd64
     4  
     5  // Copyright 2021 The Go Authors. All rights reserved.
     6  // Use of this source code is governed by a BSD-style
     7  // license that can be found in the LICENSE file.
     8  
     9  // Test that CL 281293 doesn't interfere with race detector
    10  // instrumentation.
    11  
    12  package main
    13  
    14  import "fmt"
    15  
    16  const N = 2e6
    17  
    18  type Big = [N]int
    19  
    20  var sink interface{}
    21  
    22  func main() {
    23  	g(0, f(0))
    24  
    25  	x1 := f(1)
    26  	sink = &x1
    27  	g(1, x1)
    28  	g(7, f(7))
    29  	g(1, x1)
    30  
    31  	x3 := f(3)
    32  	sink = &x3
    33  	g(1, x1)
    34  	g(3, x3)
    35  
    36  	h(f(0), x1, f(2), x3, f(4))
    37  }
    38  
    39  //go:noinline
    40  func f(k int) (x Big) {
    41  	for i := range x {
    42  		x[i] = k*N + i
    43  	}
    44  	return
    45  }
    46  
    47  //go:noinline
    48  func g(k int, x Big) {
    49  	for i := range x {
    50  		if x[i] != k*N+i {
    51  			panic(fmt.Sprintf("x%d[%d] = %d", k, i, x[i]))
    52  		}
    53  	}
    54  }
    55  
    56  //go:noinline
    57  func h(x0, x1, x2, x3, x4 Big) {
    58  	g(0, x0)
    59  	g(1, x1)
    60  	g(2, x2)
    61  	g(3, x3)
    62  	g(4, x4)
    63  }
    64
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