github.com/euank/go@v0.0.0-20160829210321-495514729181/src/cmd/compile/internal/gc/testdata/chan_ssa.go (about)

     1  // Copyright 2015 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  // chan_ssa.go tests chan operations.
     6  package main
     7  
     8  import "fmt"
     9  
    10  var failed = false
    11  
    12  //go:noinline
    13  func lenChan_ssa(v chan int) int {
    14  	return len(v)
    15  }
    16  
    17  //go:noinline
    18  func capChan_ssa(v chan int) int {
    19  	return cap(v)
    20  }
    21  
    22  func testLenChan() {
    23  
    24  	v := make(chan int, 10)
    25  	v <- 1
    26  	v <- 1
    27  	v <- 1
    28  
    29  	if want, got := 3, lenChan_ssa(v); got != want {
    30  		fmt.Printf("expected len(chan) = %d, got %d", want, got)
    31  		failed = true
    32  	}
    33  }
    34  
    35  func testLenNilChan() {
    36  
    37  	var v chan int
    38  	if want, got := 0, lenChan_ssa(v); got != want {
    39  		fmt.Printf("expected len(nil) = %d, got %d", want, got)
    40  		failed = true
    41  	}
    42  }
    43  
    44  func testCapChan() {
    45  
    46  	v := make(chan int, 25)
    47  
    48  	if want, got := 25, capChan_ssa(v); got != want {
    49  		fmt.Printf("expected cap(chan) = %d, got %d", want, got)
    50  		failed = true
    51  	}
    52  }
    53  
    54  func testCapNilChan() {
    55  
    56  	var v chan int
    57  	if want, got := 0, capChan_ssa(v); got != want {
    58  		fmt.Printf("expected cap(nil) = %d, got %d", want, got)
    59  		failed = true
    60  	}
    61  }
    62  
    63  func main() {
    64  	testLenChan()
    65  	testLenNilChan()
    66  
    67  	testCapChan()
    68  	testCapNilChan()
    69  
    70  	if failed {
    71  		panic("failed")
    72  	}
    73  }