third_party/tcmalloc/chromium/src/tests/stack_trace_table_test.cc

   1 // Copyright 2009 Google Inc. All Rights Reserved.
   2 // Author: fikes@google.com (Andrew Fikes)
   3
   4 #include "config_for_unittests.h"
   5 #include <stdio.h>   // for puts()
   6 #include "stack_trace_table.h"
   7 #include "base/logging.h"
   8 #include "base/spinlock.h"
   9 #include "static_vars.h"
  10
  11 #undef ARRAYSIZE   // may be defined on, eg, windows
  12 #define ARRAYSIZE(a)  ( sizeof(a) / sizeof(*(a)) )
  13
  14 static void CheckTracesAndReset(tcmalloc::StackTraceTable* table,
  15                         const uintptr_t* expected, int len) {
  16   void** entries = table->ReadStackTracesAndClear();
  17   for (int i = 0; i < len; ++i) {
  18     CHECK_EQ(reinterpret_cast<uintptr_t>(entries[i]), expected[i]);
  19   }
  20   delete[] entries;
  21 }
  22
  23 static void AddTrace(tcmalloc::StackTraceTable* table,
  24                      const tcmalloc::StackTrace& t) {
  25   // Normally we'd need this lock, but since the test is single-threaded
  26   // we don't.  I comment it out on windows because the DLL-decl thing
  27   // is really annoying in this case.
  28 #ifndef _MSC_VER
  29   SpinLockHolder h(tcmalloc::Static::pageheap_lock());
  30 #endif
  31   table->AddTrace(t);
  32 }
  33
  34 int main(int argc, char **argv) {
  35   tcmalloc::StackTraceTable table;
  36
  37   // Empty table
  38   CHECK_EQ(table.depth_total(), 0);
  39   CHECK_EQ(table.bucket_total(), 0);
  40   static const uintptr_t k1[] = {0};
  41   CheckTracesAndReset(&table, k1, ARRAYSIZE(k1));
  42
  43   tcmalloc::StackTrace t1;
  44   t1.size = static_cast<uintptr_t>(1024);
  45   t1.depth = static_cast<uintptr_t>(2);
  46   t1.stack[0] = reinterpret_cast<void*>(1);
  47   t1.stack[1] = reinterpret_cast<void*>(2);
  48
  49
  50   tcmalloc::StackTrace t2;
  51   t2.size = static_cast<uintptr_t>(512);
  52   t2.depth = static_cast<uintptr_t>(2);
  53   t2.stack[0] = reinterpret_cast<void*>(2);
  54   t2.stack[1] = reinterpret_cast<void*>(1);
  55
  56   // Table w/ just t1
  57   AddTrace(&table, t1);
  58   CHECK_EQ(table.depth_total(), 2);
  59   CHECK_EQ(table.bucket_total(), 1);
  60   static const uintptr_t k2[] = {1, 1024, 2, 1, 2, 0};
  61   CheckTracesAndReset(&table, k2, ARRAYSIZE(k2));
  62
  63   // Table w/ t1, t2
  64   AddTrace(&table, t1);
  65   AddTrace(&table, t2);
  66   CHECK_EQ(table.depth_total(), 4);
  67   CHECK_EQ(table.bucket_total(), 2);
  68   static const uintptr_t k3[] = {1, 1024, 2, 1, 2, 1,  512, 2, 2, 1, 0};
  69   CheckTracesAndReset(&table, k3, ARRAYSIZE(k3));
  70
  71   // Table w/ 2 x t1, 1 x t2
  72   AddTrace(&table, t1);
  73   AddTrace(&table, t2);
  74   AddTrace(&table, t1);
  75   CHECK_EQ(table.depth_total(), 4);
  76   CHECK_EQ(table.bucket_total(), 2);
  77   static const uintptr_t k4[] = {2, 2048, 2, 1, 2, 1,  512, 2, 2, 1, 0};
  78   CheckTracesAndReset(&table, k4, ARRAYSIZE(k4));
  79
  80   // Same stack as t1, but w/ different size
  81   tcmalloc::StackTrace t3;
  82   t3.size = static_cast<uintptr_t>(2);
  83   t3.depth = static_cast<uintptr_t>(2);
  84   t3.stack[0] = reinterpret_cast<void*>(1);
  85   t3.stack[1] = reinterpret_cast<void*>(2);
  86
  87   // Table w/ t1, t3
  88   AddTrace(&table, t1);
  89   AddTrace(&table, t3);
  90   CHECK_EQ(table.depth_total(), 2);
  91   CHECK_EQ(table.bucket_total(), 1);
  92   static const uintptr_t k5[] = {2, 1026, 2, 1, 2, 0};
  93   CheckTracesAndReset(&table, k5, ARRAYSIZE(k5));
  94
  95   puts("PASS");
  96   return 0;
  97 }