clang/test/Sema/unbounded-array-bounds.c

   1 // RUN: %clang_cc1 -triple x86_64-pc-linux-gnu -fsyntax-only -Wno-unused -verify=addr64,expected %s
   2 // RUN: %clang_cc1 -triple i386-pc-linux-gnu   -fsyntax-only -Wno-unused -verify=addr32,expected %s
   3 // RUN: %clang_cc1 -triple avr-pc-linux-gnu    -fsyntax-only -Wno-unused -verify=addr16,expected %s
   4
   5 struct S {
   6   long long a;
   7   char b;
   8   long long c;
   9   short d;
  10 };
  11
  12 struct S s[]; // expected-warning {{tentative array definition}} expected-note {{declared here}} addr16-note {{declared here}}
  13
  14 void f1(void) {
  15   ++s[3].a;
  16   ++s[7073650413200313099].b;
  17   // addr16-warning@-1 {{array index 7073650413200313099 refers past the last possible element for an array in 16-bit address space containing 160-bit (20-byte) elements (max possible 3276 elements)}}
  18   // addr32-warning@-2 {{array index 7073650413200313099 refers past the last possible element for an array in 32-bit address space containing 192-bit (24-byte) elements (max possible 178956970 elements)}}
  19   // addr64-warning@-3 {{array index 7073650413200313099 refers past the last possible element for an array in 64-bit address space containing 256-bit (32-byte) elements (max possible 576460752303423488 elements)}}
  20   ++s[7073650].c;
  21   // addr16-warning@-1 {{array index 7073650 refers past the last possible element for an array in 16-bit address space containing 160-bit (20-byte) elements (max possible 3276 elements)}}
  22 }
  23
  24 long long ll[]; // expected-warning {{tentative array definition}} expected-note {{declared here}} addr16-note {{declared here}} addr32-note {{declared here}}
  25
  26 void f2(void) {
  27   ++ll[3];
  28   ++ll[2705843009213693952];
  29   // addr16-warning@-1 {{array index 2705843009213693952 refers past the last possible element for an array in 16-bit address space containing 64-bit (8-byte) elements (max possible 8192 elements)}}
  30   // addr32-warning@-2 {{array index 2705843009213693952 refers past the last possible element for an array in 32-bit address space containing 64-bit (8-byte) elements (max possible 536870912 elements)}}
  31   // addr64-warning@-3 {{array index 2705843009213693952 refers past the last possible element for an array in 64-bit address space containing 64-bit (8-byte) elements (max possible 2305843009213693952 elements)}}
  32   ++ll[847073650];
  33   // addr16-warning@-1 {{array index 847073650 refers past the last possible element for an array in 16-bit address space containing 64-bit (8-byte) elements (max possible 8192 elements)}}
  34   // addr32-warning@-2 {{array index 847073650 refers past the last possible element for an array in 32-bit address space containing 64-bit (8-byte) elements (max possible 536870912 elements)}}
  35 }
  36
  37 void f3(struct S p[]) { // expected-note {{declared here}} addr16-note {{declared here}}
  38   ++p[3].a;
  39   ++p[7073650413200313099].b;
  40   // addr16-warning@-1 {{array index 7073650413200313099 refers past the last possible element for an array in 16-bit address space containing 160-bit (20-byte) elements (max possible 3276 elements)}}
  41   // addr32-warning@-2 {{array index 7073650413200313099 refers past the last possible element for an array in 32-bit address space containing 192-bit (24-byte) elements (max possible 178956970 elements)}}
  42   // addr64-warning@-3 {{array index 7073650413200313099 refers past the last possible element for an array in 64-bit address space containing 256-bit (32-byte) elements (max possible 576460752303423488 elements)}}
  43   ++p[7073650].c;
  44   // addr16-warning@-1 {{array index 7073650 refers past the last possible element for an array in 16-bit address space containing 160-bit (20-byte) elements (max possible 3276 elements)}}
  45 }
  46
  47 void f4(struct S *p) { // expected-note {{declared here}} addr16-note {{declared here}}
  48   p += 3;
  49   p += 7073650413200313099;
  50   // addr16-warning@-1 {{the pointer incremented by 7073650413200313099 refers past the last possible element for an array in 16-bit address space containing 160-bit (20-byte) elements (max possible 3276 elements)}}
  51   // addr32-warning@-2 {{the pointer incremented by 7073650413200313099 refers past the last possible element for an array in 32-bit address space containing 192-bit (24-byte) elements (max possible 178956970 elements)}}
  52   // addr64-warning@-3 {{the pointer incremented by 7073650413200313099 refers past the last possible element for an array in 64-bit address space containing 256-bit (32-byte) elements (max possible 576460752303423488 elements)}}
  53   p += 7073650;
  54   // addr16-warning@-1 {{the pointer incremented by 7073650 refers past the last possible element for an array in 16-bit address space containing 160-bit (20-byte) elements (max possible 3276 elements)}}
  55 }
  56
  57 struct BQ {
  58   struct S bigblock[3276];
  59 };
  60
  61 struct BQ bq[]; // expected-warning {{tentative array definition}} addr16-note {{declared here}}
  62
  63 void f5(void) {
  64   ++bq[0].bigblock[0].a;
  65   ++bq[1].bigblock[0].a;
  66   // addr16-warning@-1 {{array index 1 refers past the last possible element for an array in 16-bit address space containing 524160-bit (65520-byte) elements (max possible 1 element)}}
  67 }
  68
  69 void f6(void) {
  70   int ints[] = {1, 3, 5, 7, 8, 6, 4, 5, 9};
  71   int const n_ints = sizeof(ints) / sizeof(int);
  72   unsigned long long const N = 3;
  73
  74   int *middle = &ints[0] + n_ints / 2;
  75   // Should NOT produce a warning.
  76   *(middle + 5 - N) = 22;
  77 }
  78
  79 void pr50741(void) {
  80   (void *)0 + 0xdead000000000000UL;
  81   // no array-bounds warning, and no crash
  82 }
  83
  84 void func() {
  85   func + 0xdead000000000000UL; // no crash
  86 }