Source file
test/const7.go
Documentation: test
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8
9 package main
10
11 import (
12 "bytes"
13 "fmt"
14 "io/ioutil"
15 "log"
16 "os"
17 "os/exec"
18 "path/filepath"
19 "runtime"
20 "strings"
21 )
22
23
24
25
26
27 func testProg(dir, name string, G_option, length int, ok bool) {
28 var buf bytes.Buffer
29
30 fmt.Fprintf(&buf,
31 "package %s; const _ = %s // %d digits",
32 name, strings.Repeat("9", length), length,
33 )
34
35 filename := filepath.Join(dir, fmt.Sprintf("%s.go", name))
36 if err := os.WriteFile(filename, buf.Bytes(), 0666); err != nil {
37 log.Fatal(err)
38 }
39
40 cmd := exec.Command("go", "tool", "compile", fmt.Sprintf("-G=%d", G_option), filename)
41 cmd.Dir = dir
42 output, err := cmd.CombinedOutput()
43
44 if ok {
45
46 if err != nil {
47 log.Fatalf("%s: compile failed unexpectedly: %v", name, err)
48 }
49 return
50 }
51
52
53 if err == nil {
54 log.Fatalf("%s: compile succeeded unexpectedly", name)
55 }
56 if !bytes.Contains(output, []byte("excessively long constant")) {
57 log.Fatalf("%s: wrong compiler error message:\n%s\n", name, output)
58 }
59 }
60
61 func main() {
62 if runtime.GOOS == "js" || runtime.Compiler != "gc" {
63 return
64 }
65
66 dir, err := ioutil.TempDir("", "const7_")
67 if err != nil {
68 log.Fatalf("creating temp dir: %v\n", err)
69 }
70 defer os.RemoveAll(dir)
71
72 const limit = 10000
73 testProg(dir, "x1", 0, limit, true)
74 testProg(dir, "x2", 0, limit+1, false)
75 testProg(dir, "x1", 1, limit, true)
76 testProg(dir, "x2", 1, limit+1, false)
77 }
78
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