instantiate objects if permitted by the compiler.
We can use memset for zero initialized objects, and memcpy for ones cloned from
the prototype.
This permits creating objects from the parser without calling virtual
functions.
For the cases where the efficient implementation can't be used, we generate a
"placement new" style function to offload the memory allocation out of the code
generation. This reduces code bloat even when we can't use the more efficient
implementation.
Migrate many callers of `New` and similar to the new functionality. In
particular, the parsing paths will use this.
Finally, make `New` non-virtual now that `MessageLite` can handle it directly.
It reduces binary size.
PiperOrigin-RevId: 668077355
We can use memset for zero initialized objects, and memcpy for ones cloned from the prototype.
This permits creating objects from the parser without calling virtual functions.
For the cases where the efficient implementation can't be used, we generate a "placement new" style function to offload the memory allocation out of the code generation. This reduces code bloat even when we can't use the more efficient implementation.
Migrate many callers of `New` and similar to the new functionality. In particular, the parsing paths will use this.
Finally, make `New` non-virtual now that `MessageLite` can handle it directly. It reduces binary size.
PiperOrigin-RevId: 665411723
GenerateByteSize itself remains deeply nested, but by factoring out one part of
the loop, at least we make the part that generates UpdateByteSize a bit more
readable.
Making the callsite of MayEmitIfNonDefaultCheck less nested actually resulted
in slight readability improvements also in the generated code, namely of the
form:
@@ -10563,8 +10559,7 @@ PROTOBUF_NOINLINE void OneStringEdition:
{
// string data = 1;
- cached_has_bits =
- this_._impl_._has_bits_[0];
+ cached_has_bits = this_._impl_._has_bits_[0];
if (cached_has_bits & 0x00000001u) {
total_size += 1 + ::proto2::internal::WireFormatLite::StringSize(
this_._internal_data());
These readability improvements should be kept IMO -- they make the generated
protobuf C++ code slightly easier to read.
PiperOrigin-RevId: 655180880
Protobuf Team Bot
Mike Kruskal
Joshua Haberman
Tony Liao
Adam Cozzette