SIL type lowering erases DynamicSelfType, so we generate
incorrect code when casting to DynamicSelfType. Fixing this
requires a fair amount of plumbing, but most of the
changes are mechanical.
Note that the textual SIL syntax for casts has changed
slightly; the target type is now a formal type without a '$',
not a SIL type.
Also, the unconditional_checked_cast_value and
checked_cast_value_br instructions now take the _source_
formal type as well, just like the *_addr forms they are
intended to replace.
A conversion from, e.g., CFMutableDictionary to NSDictionary is still a CF bridging conversion,
even though it doesn't go directly through CFMutableDictionary's own bridged class type.
Fixes rdar://problem/51078136.
* rename "Name" to "Description" in the pass definition, because it's not really the pass name, but the description of a pass
* remove the getName() from Transforms (which actually returned the description of a pass)
* in debug printing, print the pass ID and not the pass description. It makes it easier to correlate the debug output to the actual pass implementation.
* remove the iteration numbering in the pass manager, because we only run a single iteration anyway.
If the source and target are the same existential type, but the source is P.Protocol and the dest is P.Type, then we need to consider whether the protocol is self-conforming.
The only cases where a protocol self-conforms are objc protocols, but we're going to expect P.Type to hold a class object. And this case doesn't matter since for a self-conforming protocol type there can't be any type-level methods.
Thus we consider this kind of cast to always fail. The only exception from this rule is when the target is Any.Type, because *.Protocol can always be casted to Any.Type.
Fixes rdar://32682967
If there is a conditional bridged cast from a swift type to an objc type and this cast happens in two stages, where:
- in the firs stage the Swift type is casted to its bridged ObjC class (e.g. String to NSString) and
- in the second stage there is a downcast to a subclass of a bridged ObjC class (e.g. NSString to MyString)
then the second stage should use a conditional cast.
rdar://32319580
From the Swift documentation:
"If you define an optional variable without providing a default value,
the variable is automatically set to nil for you."
*) cast optimizer: when a bridging cast is replaced with a function call and the owning convention of the instruction and the call parameter do not match, compensating retain/release instructions must be inserted.
*) cast optimizer: when a consuming dead cast instruction is removed a compensating release instruction must be inserted
*) mem2reg: An alloc_stack location which contains a destroy_addr must not be considered as a write-only location. The destroy_addr must be preserved.
rdar://problem/27601057
We now consider effect of deinit in addition to the released value.
rdar://25362826
This is the only 10%+ regression i measured on my machine. no performance improvement.
Sim2DArray | 326 | 366 | +12.3% | **0.89x**
Also, mark witness thunks for [fragile] witnesses as [fragile].
This allows us to serialize the witness table, as well as any thunks
for witnesses declared @_transparent and @inline(__always).
This lets us eliminate the _getObjectiveCType() value witness, which
was working around the lack of proper type witness metadata in witness
tables. Boilerplate -= 1.
At the moment it is only possible to test the effects that SIL
optimization passes have on debug information by observing the
effects of a full .swift -> LLVM IR compilation. This change enable us
to write targeted testcases for single SIL optimization passes.
The new syntax is as follows:
sil-scope-ref ::= 'scope' [0-9]+
sil-scope ::= 'sil_scope' [0-9]+ '{'
sil-loc
'parent' scope-parent
('inlined_at' sil-scope-ref )?
'}'
scope-parent ::= sil-function-name ':' sil-type
scope-parent ::= sil-scope-ref
sil-loc ::= 'loc' string-literal ':' [0-9]+ ':' [0-9]+
Each instruction may have a debug location and a SIL scope reference
at the end. Debug locations consist of a filename, a line number, and
a column number. If the debug location is omitted, it defaults to the
location in the SIL source file. SIL scopes describe the position
inside the lexical scope structure that the Swift expression a SIL
instruction was generated from had originally. SIL scopes also hold
inlining information.
<rdar://problem/22706994>
