Add a special case for checked_cast_addr_br instruction. If it conformed to
SourceDestAddrInstruction, then the diagnostics would already have handled it
naturally, but the instruction's conditional semantics are strange enough that
such a conformance might confuse other passes.
rdar://159793739 (Using `as?` with non-escapable types emits faulty lifetime
diagnostics)
Only record an outgoingArgument access when the current allocation is an
outgoing argument and the function exiting instruction is ReturnInst.
This avoids invalid SIL where we attempt to extend end_access up to an `unwind` but
fail to actually materialize that end_access.
Don't always consider an inout_aliasable argument to have
escaped. AccessEnforcementSelection has already done that analysis and left
begin_access [dynamic] artifacts if the argument has escaped in any meaningful
way. Use that information to
Essential for supporting autoclosures that call mutating methods on span-like
things. Such as UTF8Span.UnicodeScalarIterator.skipForward():
e.g. while numSkipped < n && skipForward() != 0 { ... }
Define LocalAccessInfo._isFullyAssigned to mean that the access does not read
the incoming value. Then treat any assignment that isn't full as a potential read.
This instruction can be used to disable ownership verification on it's result and
will be allowed only in raw SIL.
Sometimes SILGen can produce invalid ownership SSA, that cannot be resolved until
mandatory passes run. We have a few ways to piecewise disable verification.
With unchecked_ownership instruction we can provide a uniform way to disable ownership
verification for a value.
[concurrency] Change #isolated to mask out the TBI bits of the witness pointer of the implicit isolated any Actor pointer so we can do optimizations on TBI supporting platforms in the future.
Calling `cloneRecursively` from `SpecializationInfo.cloneClosures`
requires the callee having ownership info. Otherwise, the cloner uses
`recordFoldedValue` instead of `recordClonedInstruction`, and
`postProcess` hook is not called, which leads to an assertion failure in
`BridgedClonerImpl::cloneInst`.
This instruction converts Builtin.ImplicitActor to Optional<any Actor>. In the
process of doing so, it masks out the bits we may have stolen from the witness
table pointer of Builtin.ImplicitActor. The bits that we mask out are the bottom
two bits of the top nibble of the TBI space on platforms that support TBI (that
is bit 60,61 on arm64). On platforms that do not support TBI, we just use the
bottom two tagged pointer bits (0,1).
By using an instruction, we avoid having to represent the bitmasking that we are
performing at the SIL level and can instead just make the emission of the
bitmasking an IRGen detail. It also allows us to move detection if we are
compiling for AArch64 to be an IRGen flag instead of a LangOpts flag.
The instruction is a guaranteed forwarding instruction since we want to treat
its result as a borrowed projection from the Builtin.ImplicitActor.
