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Add a unit test for odd-sized small structs (for #8117) #8363

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Merged
dbaileychess merged 4 commits into from
Aug 20, 2024
Merged

Add a unit test for odd-sized small structs (for #8117) #8363

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d60dc1d
add an odd sized test
nolen777 Jul 24, 2024
fe26ae5
formatting
nolen777 Jul 24, 2024
1040769
Merge branch 'master' into odd-test
nolen777 Jul 24, 2024
8cc858c
Merge branch 'master' into odd-test
dbaileychess Aug 20, 2024
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31 changes: 19 additions & 12 deletions tests/alignment_test.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -34,15 +34,18 @@ void AlignmentTest() {

// creating 5 structs with 2 bytes each
// 10 bytes in total for Vector data is needed
std::vector<JustSmallStruct> small_vector = {
{ 2, 1 }, { 3, 1 }, { 4, 1 }
};
std::vector<EvenSmallStruct> even_vector = { { 2, 1 }, { 3, 1 }, { 4, 1 } };
std::vector<OddSmallStruct> odd_vector = { { 6, 5, 4 },
{ 9, 8, 7 },
{ 1, 2, 3 } };
// CreateVectorOfStructs is used in the generated CreateSmallStructsDirect()
// method, but we test it directly
Offset<Vector<const JustSmallStruct *>> small_structs_offset =
builder.CreateVectorOfStructs<JustSmallStruct>(small_vector);
Offset<Vector<const EvenSmallStruct *>> even_structs_offset =
builder.CreateVectorOfStructs<EvenSmallStruct>(even_vector);
Offset<Vector<const OddSmallStruct *>> odd_structs_offset =
builder.CreateVectorOfStructs<OddSmallStruct>(odd_vector);
Offset<SmallStructs> small_structs_root =
CreateSmallStructs(builder, small_structs_offset);
CreateSmallStructs(builder, even_structs_offset, odd_structs_offset);

builder.Finish(small_structs_root);

Expand All @@ -62,13 +65,17 @@ void AlignmentTest() {
auto root_msg =
flatbuffers::GetRoot<SmallStructs>(builder.GetBufferPointer());

TEST_EQ(root_msg->small_structs()->size(), small_vector.size());
for (flatbuffers::uoffset_t i = 0; i < root_msg->small_structs()->size();
TEST_EQ(root_msg->even_structs()->size(), even_vector.size());
for (flatbuffers::uoffset_t i = 0; i < root_msg->even_structs()->size();
++i) {
TEST_EQ(small_vector[i].var_0(),
root_msg->small_structs()->Get(i)->var_0());
TEST_EQ(small_vector[i].var_1(),
root_msg->small_structs()->Get(i)->var_1());
TEST_EQ(even_vector[i].var_0(), root_msg->even_structs()->Get(i)->var_0());
TEST_EQ(even_vector[i].var_1(), root_msg->even_structs()->Get(i)->var_1());
}

TEST_EQ(root_msg->odd_structs()->size(), even_vector.size());
for (flatbuffers::uoffset_t i = 0; i < root_msg->odd_structs()->size(); ++i) {
TEST_EQ(odd_vector[i].var_0(), root_msg->odd_structs()->Get(i)->var_0());
TEST_EQ(odd_vector[i].var_1(), root_msg->odd_structs()->Get(i)->var_1());
}
}

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17 changes: 13 additions & 4 deletions tests/alignment_test.fbs
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Original file line number Diff line number Diff line change
Expand Up @@ -21,15 +21,24 @@ table BadAlignmentRoot {
small: [BadAlignmentSmall];
}

// sizeof(JustSmallStruct) == 2
// alignof(JustSmallStruct) == 1
struct JustSmallStruct {
// sizeof(EvenSmallStruct) == 2
// alignof(EvenSmallStruct) == 1
struct EvenSmallStruct {
var_0: uint8;
var_1: uint8;
}

// sizeof(OddSmallStruct) == 3
// alignof(OddSmallStruct) == 1
struct OddSmallStruct {
var_0: uint8;
var_1: uint8;
var_2: uint8;
}

table SmallStructs {
small_structs: [JustSmallStruct];
even_structs: [EvenSmallStruct];
odd_structs: [OddSmallStruct];
}

root_type SmallStructs;