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      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 // First test |MOJO_STATIC_ASSERT()| in a global scope.
     23 MOJO_STATIC_ASSERT(sizeof(int64_t) == 2 * sizeof(int32_t),
     24                    "Bad static_assert() failure in global scope");
     25 
     26 TEST(MacrosTest, CompileAssert) {
     27   // Then in a local scope.
     28   MOJO_STATIC_ASSERT(sizeof(int32_t) == 2 * sizeof(int16_t),
     29                      "Bad static_assert() failure");
     30 }
     31 
     32 TEST(MacrosTest, Alignof) {
     33   // Strictly speaking, this isn't a portable test, but I think it'll pass on
     34   // all the platforms we currently support.
     35   EXPECT_EQ(1u, MOJO_ALIGNOF(char));
     36   EXPECT_EQ(4u, MOJO_ALIGNOF(int32_t));
     37   EXPECT_EQ(8u, MOJO_ALIGNOF(int64_t));
     38   EXPECT_EQ(8u, MOJO_ALIGNOF(double));
     39 }
     40 
     41 // These structs are used in the Alignas test. Define them globally to avoid
     42 // MSVS warnings/errors.
     43 #if defined(_MSC_VER)
     44 #pragma warning(push)
     45 // Disable the warning "structure was padded due to __declspec(align())".
     46 #pragma warning(disable : 4324)
     47 #endif
     48 struct MOJO_ALIGNAS(1) StructAlignas1 {
     49   char x;
     50 };
     51 struct MOJO_ALIGNAS(4) StructAlignas4 {
     52   char x;
     53 };
     54 struct MOJO_ALIGNAS(8) StructAlignas8 {
     55   char x;
     56 };
     57 #if defined(_MSC_VER)
     58 #pragma warning(pop)
     59 #endif
     60 
     61 TEST(MacrosTest, Alignas) {
     62   EXPECT_EQ(1u, MOJO_ALIGNOF(StructAlignas1));
     63   EXPECT_EQ(4u, MOJO_ALIGNOF(StructAlignas4));
     64   EXPECT_EQ(8u, MOJO_ALIGNOF(StructAlignas8));
     65 }
     66 
     67 }  // namespace
     68 }  // namespace mojo
     69