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 #include <limits> 6 7 #include "mojo/public/cpp/bindings/lib/bindings_serialization.h" 8 #include "mojo/public/cpp/bindings/lib/fixed_buffer.h" 9 #include "testing/gtest/include/gtest/gtest.h" 10 11 namespace mojo { 12 namespace test { 13 namespace { 14 15 bool IsZero(void* p_buf, size_t size) { 16 char* buf = reinterpret_cast<char*>(p_buf); 17 for (size_t i = 0; i < size; ++i) { 18 if (buf[i] != 0) 19 return false; 20 } 21 return true; 22 } 23 24 // Tests that FixedBuffer allocates memory aligned to 8 byte boundaries. 25 TEST(FixedBufferTest, Alignment) { 26 internal::FixedBuffer buf(internal::Align(10) * 2); 27 ASSERT_EQ(buf.size(), 16u * 2); 28 29 void* a = buf.Allocate(10); 30 ASSERT_TRUE(a); 31 EXPECT_TRUE(IsZero(a, 10)); 32 EXPECT_EQ(0, reinterpret_cast<ptrdiff_t>(a) % 8); 33 34 void* b = buf.Allocate(10); 35 ASSERT_TRUE(b); 36 EXPECT_TRUE(IsZero(b, 10)); 37 EXPECT_EQ(0, reinterpret_cast<ptrdiff_t>(b) % 8); 38 39 // Any more allocations would result in an assert, but we can't test that. 40 } 41 42 // Tests that FixedBuffer::Leak passes ownership to the caller. 43 TEST(FixedBufferTest, Leak) { 44 void* ptr = NULL; 45 void* buf_ptr = NULL; 46 { 47 internal::FixedBuffer buf(8); 48 ASSERT_EQ(8u, buf.size()); 49 50 ptr = buf.Allocate(8); 51 ASSERT_TRUE(ptr); 52 buf_ptr = buf.Leak(); 53 54 // The buffer should point to the first element allocated. 55 // TODO(mpcomplete): Is this a reasonable expectation? 56 EXPECT_EQ(ptr, buf_ptr); 57 58 // The FixedBuffer should be empty now. 59 EXPECT_EQ(0u, buf.size()); 60 EXPECT_FALSE(buf.Leak()); 61 } 62 63 // Since we called Leak, ptr is still writable after FixedBuffer went out of 64 // scope. 65 memset(ptr, 1, 8); 66 free(buf_ptr); 67 } 68 69 #ifdef NDEBUG 70 TEST(FixedBufferTest, TooBig) { 71 internal::FixedBuffer buf(24); 72 73 // A little bit too large. 74 EXPECT_EQ(reinterpret_cast<void*>(0), buf.Allocate(32)); 75 76 // Move the cursor forward. 77 EXPECT_NE(reinterpret_cast<void*>(0), buf.Allocate(16)); 78 79 // A lot too large. 80 EXPECT_EQ(reinterpret_cast<void*>(0), 81 buf.Allocate(std::numeric_limits<size_t>::max() - 1024u)); 82 83 // A lot too large, leading to possible integer overflow. 84 EXPECT_EQ(reinterpret_cast<void*>(0), 85 buf.Allocate(std::numeric_limits<size_t>::max() - 8u)); 86 } 87 #endif 88 89 } // namespace 90 } // namespace test 91 } // namespace mojo 92