mojo/public/c/system/tests/macros_unittest.cc

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 // This file tests the C Mojo system macros and consists of "positive" tests,
   6 // i.e., those verifying that things work (without compile errors, or even
   7 // warnings if warnings are treated as errors).
   8 // TODO(vtl): Fix no-compile tests (which are all disabled; crbug.com/105388)
   9 // and write some "negative" tests.
  10
  11 #include "mojo/public/c/system/macros.h"
  12
  13 #include <assert.h>
  14 #include <stdint.h>
  15 #include <stdlib.h>
  16
  17 #include "testing/gtest/include/gtest/gtest.h"
  18
  19 namespace mojo {
  20 namespace {
  21
  22 TEST(MacrosTest, AllowUnused) {
  23   // Test that no warning/error is issued even though |x| is unused.
  24   int x = 123;
  25   MOJO_ALLOW_UNUSED_LOCAL(x);
  26 }
  27
  28 int MustUseReturnedResult() MOJO_WARN_UNUSED_RESULT;
  29 int MustUseReturnedResult() {
  30   return 456;
  31 }
  32
  33 TEST(MacrosTest, WarnUnusedResult) {
  34   if (!MustUseReturnedResult())
  35     abort();
  36 }
  37
  38 // First test |MOJO_STATIC_ASSERT()| in a global scope.
  39 MOJO_STATIC_ASSERT(sizeof(int64_t) == 2 * sizeof(int32_t),
  40                    "Bad static_assert() failure in global scope");
  41
  42 TEST(MacrosTest, CompileAssert) {
  43   // Then in a local scope.
  44   MOJO_STATIC_ASSERT(sizeof(int32_t) == 2 * sizeof(int16_t),
  45                      "Bad static_assert() failure");
  46 }
  47
  48 TEST(MacrosTest, Alignof) {
  49   // Strictly speaking, this isn't a portable test, but I think it'll pass on
  50   // all the platforms we currently support.
  51   EXPECT_EQ(1u, MOJO_ALIGNOF(char));
  52   EXPECT_EQ(4u, MOJO_ALIGNOF(int32_t));
  53   EXPECT_EQ(8u, MOJO_ALIGNOF(int64_t));
  54   EXPECT_EQ(8u, MOJO_ALIGNOF(double));
  55 }
  56
  57 // These structs are used in the Alignas test. Define them globally to avoid
  58 // MSVS warnings/errors.
  59 #if defined(_MSC_VER)
  60 #pragma warning(push)
  61 // Disable the warning "structure was padded due to __declspec(align())".
  62 #pragma warning(disable : 4324)
  63 #endif
  64 struct MOJO_ALIGNAS(1) StructAlignas1 {
  65   char x;
  66 };
  67 struct MOJO_ALIGNAS(4) StructAlignas4 {
  68   char x;
  69 };
  70 struct MOJO_ALIGNAS(8) StructAlignas8 {
  71   char x;
  72 };
  73 #if defined(_MSC_VER)
  74 #pragma warning(pop)
  75 #endif
  76
  77 TEST(MacrosTest, Alignas) {
  78   EXPECT_EQ(1u, MOJO_ALIGNOF(StructAlignas1));
  79   EXPECT_EQ(4u, MOJO_ALIGNOF(StructAlignas4));
  80   EXPECT_EQ(8u, MOJO_ALIGNOF(StructAlignas8));
  81 }
  82
  83 }  // namespace
  84 }  // namespace mojo