src/libcompiler_builtins/compiler-rt/test/esan/TestCases/workingset-simple.cpp

   1 // RUN: %clang_esan_wset -O0 %s -o %t 2>&1
   2 // RUN: %run %t 2>&1 | FileCheck %s
   3
   4 // FIXME: Re-enable once PR33590 is fixed.
   5 // UNSUPPORTED: x86_64
   6
   7 #include <stdlib.h>
   8 #include <string.h>
   9 #include <sys/mman.h>
  10 #include <assert.h>
  11
  12 const int size = 0x1 << 25; // 523288 cache lines
  13 const int line_size = 64;
  14
  15 int main(int argc, char **argv) {
  16   char *bufA = (char *)malloc(sizeof(char) * line_size);
  17   char bufB[64];
  18   char *bufC = (char *)mmap(0, size, PROT_READ | PROT_WRITE,
  19                             MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
  20   bufA[0] = 0;
  21   // This additional access to the same line should not increase the line
  22   // count: but it's difficult to make a non-flaky test that measures the
  23   // lines down to the ones digit so right now we're not really testing that.
  24   // If we add a heap-only mode we may be able to be more precise.
  25   bufA[1] = 0;
  26   bufB[33] = 1;
  27   for (int i = 0; i < size; i += line_size)
  28     bufC[i] = 0;
  29   free(bufA);
  30   munmap(bufC, 0x4000);
  31   // CHECK: {{.*}} EfficiencySanitizer: the total working set size: 32 MB (524{{[0-9][0-9][0-9]}} cache lines)
  32   return 0;
  33 }