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comparison gcc/testsuite/g++.dg/init/string2.C @ 131:84e7813d76e9

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gcc-8.2
author mir3636
date Thu, 25 Oct 2018 07:37:49 +0900
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111:04ced10e8804 131:84e7813d76e9
1 // PR tree-optimization/71625 - missing strlen optimization on different
2 // array initialization style
3 //
4 // Verify that strlen() calls with constant character array arguments
5 // initialized with string constants are folded. (This is a small
6 // subset of pr71625).
7 // { dg-do compile }
8 // { dg-options "-O0 -Wno-error=narrowing -fdump-tree-gimple" }
9
10 #define A(expr) do { typedef char A[-1 + 2 * !!(expr)]; } while (0)
11
12 /* This is undefined but accepted without -Wpedantic. Verify that
13 the size is zero. */
14 const char ax[] = { };
15
16 void size0 ()
17 {
18 A (sizeof ax == 0);
19 }
20
21 const char a0[] = { 'a', 'b', 'c', '\0' };
22
23 int len0 ()
24 {
25 return __builtin_strlen (a0);
26 }
27
28 // Verify that narrowing warnings are preserved.
29 const signed char
30 sa0[] = { 'a', 'b', 255, '\0' }; // { dg-warning "\\\[\(-Wnarrowing|-Woverflow\)" "" { target { ! c++98_only } } }
31
32 int lens0 ()
33 {
34 return __builtin_strlen ((const char*)sa0);
35 }
36
37 const unsigned char
38 ua0[] = { 'a', 'b', -1, '\0' }; // { dg-warning "\\\[\(-Wnarrowing|-Woverflow\)" "" { target { ! c++98_only } } }
39
40 int lenu0 ()
41 {
42 return __builtin_strlen ((const char*)ua0);
43 }
44
45 const char c = 0;
46 const char a1[] = { 'a', 'b', 'c', c };
47
48 int len1 ()
49 {
50 return __builtin_strlen (a1);
51 }
52
53 template <class T>
54 int tmplen ()
55 {
56 static const T
57 a[] = { 1, 2, 333, 0 }; // { dg-warning "\\\[\(-Wnarrowing|-Woverflow\)" }
58 return __builtin_strlen (a);
59 }
60
61 template int tmplen<char>();
62
63 const wchar_t ws4[] = { 1, 2, 3, 4 };
64 const wchar_t ws7[] = { 1, 2, 3, 4, 0, 0, 0 };
65 const wchar_t ws9[9] = { 1, 2, 3, 4, 0 };
66
67 void wsize ()
68 {
69 A (sizeof ws4 == 4 * sizeof *ws4);
70 A (ws4[0] == 1 && ws4[1] == 2 && ws4[2] == 3 && ws4[3] == 4);
71
72 A (sizeof ws7 == 7 * sizeof *ws7);
73 A (ws7[0] == 1 && ws7[1] == 2 && ws7[2] == 3 && ws7[4] == 4
74 && !ws7[5] && !ws7[6]);
75
76 A (sizeof ws9 == 9 * sizeof *ws9);
77 A (ws9[0] == 1 && ws9[1] == 2 && ws9[2] == 3 && ws9[4] == 4
78 && !ws9[5] && !ws9[6] && !ws9[7] && !ws9[8]);
79 }
80
81 #if 0
82
83 // The following aren't handled.
84
85 const char &cref = c;
86 const char a2[] = { 'a', 'b', 'c', cref };
87
88 int len2 ()
89 {
90 return __builtin_strlen (a2);
91 }
92
93
94 const char* const cptr = &cref;
95 const char a3[] = { 'a', 'b', 'c', *cptr };
96
97 int len3 ()
98 {
99 return __builtin_strlen (a3);
100 }
101
102 #endif
103
104 // { dg-final { scan-tree-dump-times "strlen" 0 "gimple" } }