Home | History | Annotate | Download | only in gtl 
      1 /* Copyright 2015 The TensorFlow Authors. All Rights Reserved.
      2 
      3 Licensed under the Apache License, Version 2.0 (the "License");
      4 you may not use this file except in compliance with the License.
      5 You may obtain a copy of the License at
      6 
      7     http://www.apache.org/licenses/LICENSE-2.0
      8 
      9 Unless required by applicable law or agreed to in writing, software
     10 distributed under the License is distributed on an "AS IS" BASIS,
     11 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     12 See the License for the specific language governing permissions and
     13 limitations under the License.
     14 ==============================================================================*/
     15 
     16 #include "tensorflow/core/lib/gtl/manual_constructor.h"
     17 
     18 #include <stdint.h>
     19 
     20 #include "tensorflow/core/platform/logging.h"
     21 #include "tensorflow/core/platform/test.h"
     22 
     23 namespace tensorflow {
     24 namespace {
     25 
     26 static int constructor_count_ = 0;
     27 
     28 template <int kSize>
     29 struct TestN {
     30   TestN() { ++constructor_count_; }
     31   ~TestN() { --constructor_count_; }
     32   char a[kSize];
     33 };
     34 
     35 typedef TestN<1> Test1;
     36 typedef TestN<2> Test2;
     37 typedef TestN<3> Test3;
     38 typedef TestN<4> Test4;
     39 typedef TestN<5> Test5;
     40 typedef TestN<9> Test9;
     41 typedef TestN<15> Test15;
     42 
     43 }  // namespace
     44 
     45 namespace {
     46 
     47 TEST(ManualConstructorTest, Sizeof) {
     48   CHECK_EQ(sizeof(ManualConstructor<Test1>), sizeof(Test1));
     49   CHECK_EQ(sizeof(ManualConstructor<Test2>), sizeof(Test2));
     50   CHECK_EQ(sizeof(ManualConstructor<Test3>), sizeof(Test3));
     51   CHECK_EQ(sizeof(ManualConstructor<Test4>), sizeof(Test4));
     52   CHECK_EQ(sizeof(ManualConstructor<Test5>), sizeof(Test5));
     53   CHECK_EQ(sizeof(ManualConstructor<Test9>), sizeof(Test9));
     54   CHECK_EQ(sizeof(ManualConstructor<Test15>), sizeof(Test15));
     55 
     56   CHECK_EQ(constructor_count_, 0);
     57   ManualConstructor<Test1> mt[4];
     58   CHECK_EQ(sizeof(mt), 4);
     59   CHECK_EQ(constructor_count_, 0);
     60   mt[0].Init();
     61   CHECK_EQ(constructor_count_, 1);
     62   mt[0].Destroy();
     63 }
     64 
     65 TEST(ManualConstructorTest, Alignment) {
     66   // We want to make sure that ManualConstructor aligns its memory properly
     67   // on a word barrier.  Otherwise, it might be unexpectedly slow, since
     68   // memory access will be unaligned.
     69 
     70   struct {
     71     char a;
     72     ManualConstructor<void*> b;
     73   } test1;
     74   struct {
     75     char a;
     76     void* b;
     77   } control1;
     78 
     79   // TODO(bww): Make these tests more direct with C++11 alignment_of<T>::value.
     80   EXPECT_EQ(reinterpret_cast<char*>(test1.b.get()) - &test1.a,
     81             reinterpret_cast<char*>(&control1.b) - &control1.a);
     82   EXPECT_EQ(reinterpret_cast<intptr_t>(test1.b.get()) % sizeof(control1.b), 0);
     83 
     84   struct {
     85     char a;
     86     ManualConstructor<long double> b;
     87   } test2;
     88   struct {
     89     char a;
     90     long double b;
     91   } control2;
     92 
     93   EXPECT_EQ(reinterpret_cast<char*>(test2.b.get()) - &test2.a,
     94             reinterpret_cast<char*>(&control2.b) - &control2.a);
     95 #ifdef ARCH_K8
     96   EXPECT_EQ(reinterpret_cast<intptr_t>(test2.b.get()) % 16, 0);
     97 #endif
     98 #ifdef ARCH_PIII
     99   EXPECT_EQ(reinterpret_cast<intptr_t>(test2.b.get()) % 4, 0);
    100 #endif
    101 }
    102 
    103 TEST(ManualConstructorTest, DefaultInitialize) {
    104   struct X {
    105     X() : x(123) {}
    106     int x;
    107   };
    108   union {
    109     ManualConstructor<X> x;
    110     ManualConstructor<int> y;
    111   } u;
    112   *u.y = -1;
    113   u.x.Init();  // should default-initialize u.x
    114   EXPECT_EQ(123, u.x->x);
    115 }
    116 
    117 TEST(ManualConstructorTest, ZeroInitializePOD) {
    118   union {
    119     ManualConstructor<int> x;
    120     ManualConstructor<int> y;
    121   } u;
    122   *u.y = -1;
    123   u.x.Init();  // should not zero-initialize u.x
    124   EXPECT_EQ(-1, *u.y);
    125 }
    126 
    127 }  // namespace
    128 }  // namespace tensorflow
    129