These instructions carry lifetime dependence from a single operand to a single result. They are not forwarding
instructions because we use them to indicate the boundaries of a forwarded lifetime.
* add ForwardingInstruction conformances to missing forwarding instruction classes
* move all the forwarding instruction conformance definitions into ForwardingInstructions.swift
* remove the default implementations of the requirements, so that every instruction needs to specify them
Add cross-compilation flags for the newly added Swift source in `lib/ASTGen/`,
similar to how `SwiftCompilerSources/` is already cross-compiled for other
platforms. Make sure the Swift source in the compiler builds and links against
`SWIFTLIB_DIR` in this cross-compilation build directory, not the one that comes
with the native host compiler.
This requires changing the dependency chain in `CROSSCOMPILE` mode, as normally
the Swift compiler is built first when building natively for the host, then it's
used to build the stdlib. However, when cross-compiling the toolchain, the stdlib
must be cross-compiled first by the host compiler, then the portions of the
Swift compiler written in Swift must be cross-compiled with that new stdlib. All
these dependency changes simply change that compilation order when cross-compiling,
including removing the dependency that the Swift compiler is built before the
stdlib when cross-compiling the Swift compiler.
All changes in this pull are gated on the `CROSSCOMPILE` mode, so they will
not affect any of the existing CI or build presets.
These were always redundant. And there is no way to emit them
correctly for valid OSA when the original dependence scope is in the
caller.
NFC without:
-enable-experimental-feature NonescapableTypes
-enable-lifetime-dependence-diagnostics
Improve noescape function handling. Use the mayEscape API.
Improve handling of @_unsafeNonescapableResult.
Improve handling of initialized scopes. Use findSingleInitializer.
Provide APIs needed by lifetime dependence diagnostics, namely LifetimeDependenceConvention.
Reorganize the APIs so it's easy to find related functionality which
API is responsible for which functionality.
Remove the originalFunctionConvention complexity. It is no longer
needed for lifetime dependence inference, and generally should be
avoided in SIL.
Add some placeholder FIXMEs because this not a good PR in which to
change existing functionality.
This unusual situation can happen if an address is converted to a raw pointer and that pointer is stored to a memory location.
In this case the walkers need to follow load instructions even if the visitor and current projection path don't say so.
Fixes a miscompile
rdar://122805546
