| Line | Branch | Decision | Exec | Source |
|---|---|---|---|---|
| 1 | /* | |||
| 2 | * test_cpp_memory_layout.cpp | |||
| 3 | * | |||
| 4 | * Jun 15, 2019 | |||
| 5 | * @author Andrey Belomutskiy, (c) 2012-2020 | |||
| 6 | */ | |||
| 7 | ||||
| 8 | #include "pch.h" | |||
| 9 | ||||
| 10 | // in C++ struct is pretty much a class just fields are public by default | |||
| 11 | struct TestParent { | |||
| 12 | int field0 = 540; | |||
| 13 | float field1 = 333.33; | |||
| 14 | }; | |||
| 15 | ||||
| 16 | class TestPlainChild: public TestParent { | |||
| 17 | public: | |||
| 18 | float getSum(); | |||
| 19 | }; | |||
| 20 | ||||
| 21 | class TestPlainChildExtraFields: public TestParent { | |||
| 22 | public: | |||
| 23 | float field3 = 35555; | |||
| 24 | float field4 = 45555; | |||
| 25 | }; | |||
| 26 | ||||
| 27 | ||||
| 28 | ✗ | float TestPlainChild::getSum() { | ||
| 29 | ✗ | return field0 + field1; | ||
| 30 | } | |||
| 31 | ||||
| 32 | class TestChildWithVirtual: public TestParent { | |||
| 33 | public: | |||
| 34 | ✗ | virtual float getSumVirtual() { | ||
| 35 | ✗ | return field0 + field1; | ||
| 36 | } | |||
| 37 | }; | |||
| 38 | ||||
| 39 | ||||
| 40 | 4 | TEST(CppMemoryLayout, PlainStruct) { | ||
| 41 | 1 | TestPlainChild c; | ||
| 42 | // validate field initializers just for fun | |||
| 43 |
3/8✓ Branch 3 taken 1 time.
✗ Branch 7 not taken.
✓ Branch 8 taken 1 time.
✗ Branch 11 not taken.
✗ Branch 16 not taken.
✗ Branch 19 not taken.
✓ Branch 26 taken 1 time.
✗ Branch 27 not taken.
|
1 | ASSERT_EQ(540, c.field0); | |
| 44 |
3/8✓ Branch 2 taken 1 time.
✗ Branch 5 not taken.
✓ Branch 6 taken 1 time.
✗ Branch 9 not taken.
✗ Branch 14 not taken.
✗ Branch 17 not taken.
✓ Branch 24 taken 1 time.
✗ Branch 25 not taken.
|
1 | ASSERT_NEAR(333.33, c.field1, EPS4D); | |
| 45 | ||||
| 46 |
3/8✓ Branch 4 taken 1 time.
✗ Branch 9 not taken.
✓ Branch 10 taken 1 time.
✗ Branch 13 not taken.
✗ Branch 18 not taken.
✗ Branch 21 not taken.
✓ Branch 28 taken 1 time.
✗ Branch 29 not taken.
|
1 | ASSERT_EQ(sizeof(c), sizeof(TestParent)); | |
| 47 | ||||
| 48 | 1 | int destimationInt = 1; | ||
| 49 | // no virtual table since nothing virtual on TestPlainChild | |||
| 50 | 1 | memcpy(&destimationInt, &c, 4); | ||
| 51 |
3/8✓ Branch 3 taken 1 time.
✗ Branch 7 not taken.
✓ Branch 8 taken 1 time.
✗ Branch 11 not taken.
✗ Branch 16 not taken.
✗ Branch 19 not taken.
✓ Branch 26 taken 1 time.
✗ Branch 27 not taken.
|
1 | ASSERT_EQ(540, destimationInt); | |
| 52 | ||||
| 53 |
3/8✓ Branch 4 taken 1 time.
✗ Branch 9 not taken.
✓ Branch 10 taken 1 time.
✗ Branch 13 not taken.
✗ Branch 18 not taken.
✗ Branch 21 not taken.
✓ Branch 28 taken 1 time.
✗ Branch 29 not taken.
|
1 | ASSERT_EQ((uintptr_t)&c.field0, (uintptr_t)&c); | |
| 54 | } | |||
| 55 | ||||
| 56 | static int valueWePointAt; | |||
| 57 | ||||
| 58 | 4 | TEST(CppMemoryLayout, VirtualStruct) { | ||
| 59 | 1 | TestChildWithVirtual c; | ||
| 60 | ||||
| 61 | // '4' in case of 32 bit target | |||
| 62 | // '8' in case of 64 bit target | |||
| 63 | 1 | size_t MAGIC_VTABLE_SIZE = sizeof(void*); | ||
| 64 | ||||
| 65 | // validate field initializers just for fun | |||
| 66 |
3/8✓ Branch 3 taken 1 time.
✗ Branch 7 not taken.
✓ Branch 8 taken 1 time.
✗ Branch 11 not taken.
✗ Branch 16 not taken.
✗ Branch 19 not taken.
✓ Branch 26 taken 1 time.
✗ Branch 27 not taken.
|
1 | ASSERT_EQ(540, c.field0); | |
| 67 |
3/8✓ Branch 2 taken 1 time.
✗ Branch 5 not taken.
✓ Branch 6 taken 1 time.
✗ Branch 9 not taken.
✗ Branch 14 not taken.
✗ Branch 17 not taken.
✓ Branch 24 taken 1 time.
✗ Branch 25 not taken.
|
1 | ASSERT_NEAR(333.33, c.field1, EPS4D); | |
| 68 | ||||
| 69 |
3/8✓ Branch 4 taken 1 time.
✗ Branch 9 not taken.
✓ Branch 10 taken 1 time.
✗ Branch 13 not taken.
✗ Branch 18 not taken.
✗ Branch 21 not taken.
✓ Branch 28 taken 1 time.
✗ Branch 29 not taken.
|
1 | ASSERT_EQ(sizeof(c), sizeof(TestParent) + MAGIC_VTABLE_SIZE); | |
| 70 | ||||
| 71 | ||||
| 72 | 1 | int destimationInt = 1; | ||
| 73 | 1 | memcpy(&destimationInt, &c, 4); | ||
| 74 |
3/8✓ Branch 3 taken 1 time.
✗ Branch 7 not taken.
✓ Branch 8 taken 1 time.
✗ Branch 11 not taken.
✗ Branch 16 not taken.
✗ Branch 19 not taken.
✓ Branch 26 taken 1 time.
✗ Branch 27 not taken.
|
1 | ASSERT_NE(540, destimationInt); | |
| 75 | ||||
| 76 | // static_cast is smart to skip the vtable, we like static_cast | |||
| 77 | 1 | TestParent *parent = static_cast<TestParent*>(&c); | ||
| 78 |
3/8✓ Branch 4 taken 1 time.
✗ Branch 9 not taken.
✓ Branch 10 taken 1 time.
✗ Branch 13 not taken.
✗ Branch 18 not taken.
✗ Branch 21 not taken.
✓ Branch 28 taken 1 time.
✗ Branch 29 not taken.
|
1 | ASSERT_EQ((uintptr_t)&c.field0, (uintptr_t)parent); | |
| 79 | ||||
| 80 |
3/8✓ Branch 3 taken 1 time.
✗ Branch 7 not taken.
✓ Branch 8 taken 1 time.
✗ Branch 11 not taken.
✗ Branch 16 not taken.
✗ Branch 19 not taken.
✓ Branch 26 taken 1 time.
✗ Branch 27 not taken.
|
1 | ASSERT_EQ(MAGIC_VTABLE_SIZE, (uintptr_t)&c.field0 - (uintptr_t)&c); | |
| 81 | ||||
| 82 | ||||
| 83 | } | |||
| 84 | ||||
| 85 | 4 | TEST(CppMemoryLayout, PlainExtraFieldsStruct) { | ||
| 86 | 1 | TestPlainChildExtraFields c; | ||
| 87 | ||||
| 88 |
3/8✓ Branch 4 taken 1 time.
✗ Branch 9 not taken.
✓ Branch 10 taken 1 time.
✗ Branch 13 not taken.
✗ Branch 18 not taken.
✗ Branch 21 not taken.
✓ Branch 28 taken 1 time.
✗ Branch 29 not taken.
|
1 | ASSERT_EQ(sizeof(c), sizeof(TestParent) + 8); | |
| 89 | ||||
| 90 | 1 | int destimationInt = 1; | ||
| 91 | // parent fields go first | |||
| 92 | 1 | memcpy(&destimationInt, &c, 4); | ||
| 93 |
3/8✓ Branch 3 taken 1 time.
✗ Branch 7 not taken.
✓ Branch 8 taken 1 time.
✗ Branch 11 not taken.
✗ Branch 16 not taken.
✗ Branch 19 not taken.
✓ Branch 26 taken 1 time.
✗ Branch 27 not taken.
|
1 | ASSERT_EQ(540, destimationInt); | |
| 94 |
3/8✓ Branch 4 taken 1 time.
✗ Branch 9 not taken.
✓ Branch 10 taken 1 time.
✗ Branch 13 not taken.
✗ Branch 18 not taken.
✗ Branch 21 not taken.
✓ Branch 28 taken 1 time.
✗ Branch 29 not taken.
|
1 | ASSERT_EQ(0u, (uintptr_t)&c.field0 - (uintptr_t)&c); | |
| 95 | } | |||
| 96 | ||||
| 97 | TEST(CppMemoryLayout, structSize) { | |||
| 98 | ASSERT_EQ(1u, sizeof(adc_channel_e)) << "adc_channel_e enum size"; | |||
| 99 | ASSERT_EQ(1u, sizeof(pin_input_mode_e)) << "pin_input_mode_e enum size"; | |||
| 100 | ASSERT_EQ(1u, sizeof(pin_output_mode_e)) << "pin_output_mode_e enum size"; | |||
| 101 | ASSERT_EQ(2u, sizeof(brain_pin_e)) << "brain_pin_e enum size"; | |||
| 102 | ASSERT_EQ(12u, sizeof(air_pressure_sensor_config_s)); | |||
| 103 | ASSERT_EQ(size_t(TOTAL_CONFIG_SIZE), sizeof(persistent_config_s)); | |||
| 104 | } | |||
| 105 |