_isClassType is mainly called by compiler-generated code, but it's also
called by stdlib. The call-site of stdlib used @_silgen_name to link the
function, so it's called through swiftcc. However its cc is defined as
C-cc, so caller and callee used different cc.
This patch adds C-compatible decl of swift_isClassType in shims so that
it can be called by stdlib with C-cc.
This change doesn't break ABI because `_isClassType` in stdlib was
defined as internal API.
While the existing _forEachField in ReflectionMirror.swift
already gives the offsets and types for each field, this isn't
enough information to construct a keypath for that field in
order to modify it.
For reference, this should be sufficent to implement the features
described here: (https://forums.swift.org/t/storedpropertyiterable/19218/62)
purely at runtime without any derived conformances for many types.
Note: Since there isn't enough reflection information for
`.mutatingGetSet` fields, this means that we're not able to support
reflecting certain types of fields (functions, nonfinal class fields,
etc). Whether this is an error or not is controlled by the `.ignoreUnknown`
option.
This function walks all the fields of a struct, class, or tuple, and calls
`body` with the name, offset, and type of each field. `body` can perform
any required work or validation, returning `true` to continue walking fields
or `false` to stop immediately.
It is causing bots to fail.
* Revert "The __has_include(<os/system_version.h>) branch here wasn't quite right, we'll just use the dlsym one for now"
This reverts commit f824922456.
* Revert "Remove stdlib and runtime dependencies on Foundation and CF"
This reverts commit 3fe46e3f16.
rdar://54709269
The old-style mirrors were the basis for non-custom, reflection based Mirrors. As part of removing old-style mirrors, reflection based Mirrors are reimplemented without them. Reflection.mm is deleted and replaced with ReflectionMirror.mm, which borrows a chunk of the old code but presents a simpler API to the Swift side. ReflectionMirror.swift then uses that API to implement a reflection-based Mirror init.
rdar://problem/20356017
