Create a static flatbuffer FixedStackAllocator
This allows us to create builders for flatbuffers that don't have
dynamic memory requirements without mallocing.
Signed-off-by: Maxwell Henderson <mxwhenderson@gmail.com>
Change-Id: Ic4a0d6b1bdc807ba0af47b0db44197becefa349d
diff --git a/aos/flatbuffers/static_flatbuffers_test.cc b/aos/flatbuffers/static_flatbuffers_test.cc
index 2acc3c8..83370e7 100644
--- a/aos/flatbuffers/static_flatbuffers_test.cc
+++ b/aos/flatbuffers/static_flatbuffers_test.cc
@@ -215,7 +215,8 @@
TestMemory(builder.buffer());
}
{
- // aos::FixedAllocator allocator(TestTableStatic::kUnalignedBufferSize);
+ // aos::FixedAllocator
+ // allocator(TestTableStatic::kUnalignedBufferSize);
aos::fbs::VectorAllocator allocator;
Builder<TestTableStatic> builder(&allocator);
TestTableStatic *object = builder.get();
@@ -987,4 +988,58 @@
"random access iterator.");
}
}
+
+// Confirm that we can use the FixedStackAllocator
+TEST_F(StaticFlatbuffersTest, FixedStackAllocator) {
+ aos::fbs::FixedStackAllocator<Builder<TestTableStatic>::kBufferSize>
+ allocator;
+ Builder<TestTableStatic> builder(&allocator);
+ TestTableStatic *object = builder.get();
+ object->set_scalar(123);
+ {
+ auto vector = object->add_vector_of_scalars();
+ ASSERT_TRUE(vector->emplace_back(4));
+ ASSERT_TRUE(vector->emplace_back(5));
+ }
+ {
+ auto string = object->add_string();
+ string->SetString("Hello, World!");
+ }
+ {
+ auto vector_of_strings = object->add_vector_of_strings();
+ auto sub_string = CHECK_NOTNULL(vector_of_strings->emplace_back());
+ ASSERT_TRUE(sub_string->emplace_back('D'));
+ }
+ { object->set_substruct({971, 254}); }
+ {
+ auto subtable = object->add_subtable();
+ subtable->set_foo(1234);
+ }
+ {
+ auto vector = object->add_vector_of_structs();
+ ASSERT_TRUE(vector->emplace_back({48, 67}));
+ ASSERT_TRUE(vector->emplace_back({118, 148}));
+ ASSERT_TRUE(vector->emplace_back({971, 973}));
+ // Max vector size is three; this should fail.
+ ASSERT_FALSE(vector->emplace_back({1114, 2056}));
+ // We don't have any extra space available.
+ ASSERT_FALSE(vector->reserve(4));
+ ASSERT_FALSE(vector->emplace_back({1114, 2056}));
+ }
+ {
+ auto vector = object->add_vector_of_tables();
+ auto subobject = vector->emplace_back();
+ subobject->set_foo(222);
+ }
+ {
+ auto subtable = object->add_included_table();
+ subtable->set_foo(included::TestEnum::B);
+ }
+ ASSERT_TRUE(builder.AsFlatbufferSpan().Verify());
+ VLOG(1) << aos::FlatbufferToJson(builder.AsFlatbufferSpan(),
+ {.multi_line = true});
+ VLOG(1) << AnnotateBinaries(test_schema_, builder.buffer());
+ TestMemory(builder.buffer());
+}
+
} // namespace aos::fbs::testing