Allow using ExtendMatchingProperties to extend pointer to a struct or an
interface containing a pointer to a struct using a struct, and
vice-versa.
Also fixes a pre-existing bug where extending a nested structure could
fail if there were multiple possible destnations and some of them did
not have a matching nested property.
Change-Id: I6e69d78eb6595ba7dd2603e3aa7dd8de3f292744
Allow primary builders to reduce allocations of empty structures by
allowing nil pointers to concrete struct types. Property readers will
not recurse into nil pointers, property writers will replace the nil
pointer with a pointer to the zero value of the pointer element type.
Allows a >50% primary builder time improvement with a trivial change in
Soong.
Change-Id: If6ad674bf7bf2a694c335378a074643a97d3c50b
ExtendProperties is the same as AppendProperties or PrependProperties,
but takes a function that determines whether each property should be
appended or prepended.
Change-Id: I26e400d56d75a88bab9c27c382ee5321bc623ee5
This makes *string values act like *bool values -- instead of appending
or prepending the contents of the string, the entire string is replaced.
The use case here is for overriding filenames, where appending doesn't
work.
Allow property structs to contain anonymous embedded structs and
interfaces. Properties in an anonymous embedded struct or interface are
treated as if they were properties in the embedding struct.
The only append semantics for bool that result in a no-op when the zero
value is appended is to OR the two values together, but that is rarely
the desired semantics. Add support for *bool and *string as property
types, where appending a nil pointer is a no-op. For *bool, appending a
non-nil pointer replaces the destination with the value. For *string,
appending a non-nil pointer appends the value.
This also provides a more reliable replacement for
ModuleContext.ContainsProperty, as the build logic can tell that the
property was set, even if it was set by a mutator and not by the
blueprints file, by testing against nil.
[]string already provides these semantics for lists.
Setting a *bool or *string property from a blueprints file is the same
syntax as setting a bool or a string property.
It is common for a mutator to append or prepend property structs
together. Add helper functions to append or prepend properties in property
structs. The append operation is defined as appending string and slices
of strings normally, OR-ing bool values, and recursing into embedded
structs, pointers to structs, and interfaces containing pointers to
structs. Appending or prepending the zero value of a property will
always be a no-op.
