clang/test/Analysis/index-type.c

   1 // RUN: %clang_analyze_cc1 -triple x86_64-apple-darwin10 -analyzer-checker=core,alpha.security.ArrayBoundV2 -Wno-implicit-function-declaration -verify %s
   2 // RUN: %clang_analyze_cc1 -triple i386-apple-darwin10 -analyzer-checker=core,alpha.security.ArrayBoundV2 -Wno-implicit-function-declaration -DM32 -verify %s
   3 // expected-no-diagnostics
   4
   5 #define UINT_MAX (~0u)
   6
   7 #ifdef M32
   8
   9 #define X86_ARRAY_SIZE (UINT_MAX/2 + 4)
  10
  11 void testIndexTooBig(void) {
  12   char arr[X86_ARRAY_SIZE];
  13   char *ptr = arr + UINT_MAX/2;
  14   ptr += 2;  // index shouldn't overflow
  15   *ptr = 42; // no-warning
  16 }
  17
  18 #else // 64-bit tests
  19
  20 #define ARRAY_SIZE 0x100000000
  21
  22 void testIndexOverflow64(void) {
  23   char arr[ARRAY_SIZE];
  24   char *ptr = arr + UINT_MAX/2;
  25   ptr += 2;  // don't overflow 64-bit index
  26   *ptr = 42; // no-warning
  27 }
  28
  29 #define ULONG_MAX (~0ul)
  30 #define BIG_INDEX (ULONG_MAX/16)
  31
  32 void testIndexTooBig64(void) {
  33   char arr[ULONG_MAX/8-1];
  34   char *ptr = arr + BIG_INDEX;
  35   ptr += 2;  // don't overflow 64-bit index
  36   *ptr = 42; // no-warning
  37 }
  38
  39 #define SIZE 4294967296
  40
  41 static unsigned size;
  42 static void * addr;
  43 static unsigned buf[SIZE];
  44
  45 void testOutOfBounds(void) {
  46   // Not out of bounds.
  47   buf[SIZE-1] = 1; // no-warning
  48 }
  49
  50 void testOutOfBoundsCopy1(void) {
  51   memcpy(buf, addr, size); // no-warning
  52 }
  53
  54 void testOutOfBoundsCopy2(void) {
  55   memcpy(addr, buf, size); // no-warning
  56 }
  57
  58 #endif