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Add ForceVectorAlignment64 and test (#7977)

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This commit is contained in:
Derek Bailey
2023-05-26 11:49:06 -07:00
committed by GitHub
parent b7856f8e27
commit 96294e9f84
9 changed files with 150 additions and 76 deletions
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21
include/flatbuffers/flatbuffer_builder.h
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@@ -566,7 +566,7 @@ template<bool Is64Aware = false> class FlatBufferBuilderImpl {
return CreateString<OffsetT>(str.c_str(), str.length());
}
// clang-format off
// clang-format off
#ifdef FLATBUFFERS_HAS_STRING_VIEW
/// @brief Store a string in the buffer, which can contain any binary data.
/// @param[in] str A const string_view to copy in to the buffer.
@@ -698,12 +698,27 @@ template<bool Is64Aware = false> class FlatBufferBuilderImpl {
// normally dictate.
// This is useful when storing a nested_flatbuffer in a vector of bytes,
// or when storing SIMD floats, etc.
void ForceVectorAlignment(size_t len, size_t elemsize, size_t alignment) {
void ForceVectorAlignment(const size_t len, const size_t elemsize,
const size_t alignment) {
if (len == 0) return;
FLATBUFFERS_ASSERT(VerifyAlignmentRequirements(alignment));
PreAlign(len * elemsize, alignment);
}
template<bool is_64 = Is64Aware>
typename std::enable_if<is_64, void>::type ForceVectorAlignment64(
const size_t len, const size_t elemsize, const size_t alignment) {
// If you hit this assertion, you are trying to force alignment on a
// vector with offset64 after serializing a 32-bit offset.
FLATBUFFERS_ASSERT(GetSize() == length_of_64_bit_region_);
// Call through.
ForceVectorAlignment(len, elemsize, alignment);
// Update the 64 bit region.
length_of_64_bit_region_ = GetSize();
}
// Similar to ForceVectorAlignment but for String fields.
void ForceStringAlignment(size_t len, size_t alignment) {
if (len == 0) return;
@@ -733,7 +748,7 @@ template<bool Is64Aware = false> class FlatBufferBuilderImpl {
AssertScalarT<T>();
StartVector<T, OffsetT, LenT>(len);
if (len > 0) {
// clang-format off
// clang-format off
#if FLATBUFFERS_LITTLEENDIAN
PushBytes(reinterpret_cast<const uint8_t *>(v), len * sizeof(T));
#else