Ensure that context descriptor pointers are signed in the runtime by putting the ptrauth_struct attribute on the types.
We use the new __builtin_ptrauth_struct_key/disc to conditionally apply ptrauth_struct to TrailingObjects based on the signing of the base type, so that pointers to TrailingObjects get signed when used with a context descriptor pointer.
We add new runtime entrypoints that take signed pointers where appropriate, and have the compiler emit calls to the new entrypoints when targeting a sufficiently new OS.
rdar://111480914
Pointers returned by malloc() are 16-byte aligned on wasi-libc, even
it's 32-bit architecture. See wasi-libc's dlmalloc configuration:
aecd368c6d/dlmalloc/src/dlmalloc.c (L31)
* [Runtime] Abstract tag handling for generic single payload enums
This functionality will be shared across multiple functions, so adding the abstraction in preparation of that.
* Update BytecodeLayouts.cpp
We weren't taking advantage of standard manglings in _findProtocolDescriptor like wo do in _findContextDescriptor. Extract out the "standard mangling" code and call it from both to speed up those searches.
rdar://111235115
Reformatting everything now that we have `llvm` namespaces. I've
separated this from the main commit to help manage merge-conflicts and
for making it a bit easier to read the mega-patch.
This is phase-1 of switching from llvm::Optional to std::optional in the
next rebranch. llvm::Optional was removed from upstream LLVM, so we need
to migrate off rather soon. On Darwin, std::optional, and llvm::Optional
have the same layout, so we don't need to be as concerned about ABI
beyond the name mangling. `llvm::Optional` is only returned from one
function in
```
getStandardTypeSubst(StringRef TypeName,
bool allowConcurrencyManglings);
```
It's the return value, so it should not impact the mangling of the
function, and the layout is the same as `std::optional`, so it should be
mostly okay. This function doesn't appear to have users, and the ABI was
already broken 2 years ago for concurrency and no one seemed to notice
so this should be "okay".
I'm doing the migration incrementally so that folks working on main can
cherry-pick back to the release/5.9 branch. Once 5.9 is done and locked
away, then we can go through and finish the replacement. Since `None`
and `Optional` show up in contexts where they are not `llvm::None` and
`llvm::Optional`, I'm preparing the work now by going through and
removing the namespace unwrapping and making the `llvm` namespace
explicit. This should make it fairly mechanical to go through and
replace llvm::Optional with std::optional, and llvm::None with
std::nullopt. It's also a change that can be brought onto the
release/5.9 with minimal impact. This should be an NFC change.
* [IRGen+Runtime] Layout string getEnumTag for fixed size enums subset
getEnumTag impl for layout strings of fixed sized enums that use a function to fetch the enum tag
* Fix potential UB in IRGen
This patch makes the build system to copy the lnk files for each
stdlib targets if needed instead of only for the Linux target.
This is the take 2 of the patch. The first one was reverted in
7aa4a8de06
This patch makes the build system to copy the lnk files for each
stdlib targets if needed instead of only for the Linux target.
Co-authored-by: Max Desiatov <m_desiatov@apple.com>
