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