Use std::optional for @nullable (AIDL)
Previously, nullable types were mapped to std::unique_ptr for C++
backend. But std::unique_ptr typically involves unnecessary alloc/dealloc.
For example, if nullable string is represented in unique_ptr<string>, we
should do "unique_ptr<string>(new string(value))" to set a value.
To avoid breaking all hand-written parcelables, only new read/write
functions are added to Parcel class and they are used only by
aidl-generated code and their implementations.
Bug: 144773267
Test: build/flash/boot
atest --test-mapping frameworks/native/libs/binder
Merged-In: I2c801e3b69f2f8ccf44267f15cbf79e1d8fbf19e
Change-Id: I2c801e3b69f2f8ccf44267f15cbf79e1d8fbf19e
(cherry picked from commit 1e1c5fbbbe8a76150fe832c8f974cbd543aa0860)
Exempt-From-Owner-Approval: CP from master
11 files changed