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#ifndef UPBC_MESSAGE_LAYOUT_H
#define UPBC_MESSAGE_LAYOUT_H
#include "absl/base/macros.h"
#include "absl/container/flat_hash_map.h"
#include "google/protobuf/descriptor.h"
namespace upbc {
class MessageLayout {
public:
struct Size {
void Add(const Size& other) {
size32 += other.size32;
size64 += other.size64;
}
void MaxFrom(const Size& other) {
size32 = std::max(size32, other.size32);
size64 = std::max(size64, other.size64);
}
void AlignUp(const Size& align) {
size32 = Align(size32, align.size32);
size64 = Align(size64, align.size64);
}
int64_t size32;
int64_t size64;
};
struct SizeAndAlign {
Size size;
Size align;
void MaxFrom(const SizeAndAlign& other) {
size.MaxFrom(other.size);
align.MaxFrom(other.align);
}
};
MessageLayout(const google::protobuf::Descriptor* descriptor) {
ComputeLayout(descriptor);
}
Size GetFieldOffset(const google::protobuf::FieldDescriptor* field) const {
return GetMapValue(field_offsets_, field);
}
Size GetOneofCaseOffset(
const google::protobuf::OneofDescriptor* oneof) const {
return GetMapValue(oneof_case_offsets_, oneof);
}
int GetHasbitIndex(const google::protobuf::FieldDescriptor* field) const {
return GetMapValue(hasbit_indexes_, field);
}
Size message_size() const { return size_; }
static bool HasHasbit(const google::protobuf::FieldDescriptor* field);
static SizeAndAlign SizeOfUnwrapped(
const google::protobuf::FieldDescriptor* field);
private:
void ComputeLayout(const google::protobuf::Descriptor* descriptor);
void PlaceNonOneofFields(const google::protobuf::Descriptor* descriptor);
void PlaceOneofFields(const google::protobuf::Descriptor* descriptor);
Size Place(SizeAndAlign size_and_align);
template <class K, class V>
static V GetMapValue(const absl::flat_hash_map<K, V>& map, K key) {
auto iter = map.find(key);
if (iter == map.end()) {
fprintf(stderr, "No value for field.\n");
abort();
}
return iter->second;
}
static bool IsPowerOfTwo(size_t val) {
return (val & (val - 1)) == 0;
}
static size_t Align(size_t val, size_t align) {
ABSL_ASSERT(IsPowerOfTwo(align));
return (val + align - 1) & ~(align - 1);
}
static SizeAndAlign SizeOf(const google::protobuf::FieldDescriptor* field);
static int64_t FieldLayoutRank(
const google::protobuf::FieldDescriptor* field);
absl::flat_hash_map<const google::protobuf::FieldDescriptor*, Size>
field_offsets_;
absl::flat_hash_map<const google::protobuf::FieldDescriptor*, int>
hasbit_indexes_;
absl::flat_hash_map<const google::protobuf::OneofDescriptor*, Size>
oneof_case_offsets_;
Size maxalign_;
Size size_;
};
} // namespace upbc
#endif // UPBC_MESSAGE_LAYOUT_H
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