We have enough flag bits on function types now to warrant stashing an extra word in the metadata key alongside the arguments and results, so add one, and pack the number of arguments, function convention, and 'throws' bit in there. This lets us merge the separate metadata caches for thick/thin/block/C functions into one, saving a bit of runtime memory, and simplifying a bunch of repetitive code in the runtime and IRGen.
This also fixes a subtle bug we had where the runtime getFunctionTypeMetadata function expected the result argument to be passed in the arguments array, but IRGen was passing it as a separate argument, which would have caused function type metadata to fail to be uniqued by result type.
Swift SVN r27651
Fixes rdar://problem/20583365, and incidentally gets test/Interpreter/layout_reabstraction.swift to work without ObjC interop as well.
Swift SVN r27557
@objc protocols aren't supported with an ObjC runtime, but we still want values of AnyObject type to be word-sized. Handle this by turning the binary "needsWitnessTable" condition into a "dispatch strategy" enum, so we can recognize the condition "has no methods, so neither swift nor objc dispatch" as distinct from either swift or ObjC protocol representations. Assign this dispatch strategy when we lower AnyObject. Should be NFC for the ObjC-enabled build.
(It would also be beneficial for the ObjC-runtime-enabled version of Swift if AnyObject weren't an @objc protocol; that would mean we could give it a canonical protocol descriptor in the standard library, among other things. There are fairly deep assumptions in Sema that AnyObject is @objc, though, and it's not worth disturbing those assumptions right now.)
Reapplying with updates to the runtime unit tests.
Swift SVN r27341
@objc protocols aren't supported with an ObjC runtime, but we still want values of AnyObject type to be word-sized. Handle this by turning the binary "needsWitnessTable" condition into a "dispatch strategy" enum, so we can recognize the condition "has no methods, so neither swift nor objc dispatch" as distinct from either swift or ObjC protocol representations. Assign this dispatch strategy when we lower AnyObject. Should be NFC for the ObjC-enabled build.
(It would also be beneficial for the ObjC-runtime-enabled version of Swift if AnyObject weren't an @objc protocol; that would mean we could give it a canonical protocol descriptor in the standard library, among other things. There are fairly deep assumptions in Sema that AnyObject is @objc, though, and it's not worth disturbing those assumptions right now.)
Swift SVN r27338
If we see an ErrorType-conforming value type while casting to NSError, do the coercion in the runtime, so that e.g. 'error as Any as! NSError' works as well as 'error as NSError'.
Unfortunately, we can't do this for ErrorType-conforming classes without shattering SIL's brittle view of the world due to rdar://problem/20507075. Casts between class types are fairly deeply assumed not to change the identity of the reference.
Swift SVN r27225
This allows ErrorTypes referencing Cocoa NSErrors to be pattern-matched against our bridged enums, at least dynamically. (The compiler still doesn't understand these bridging conversions yet.)
Swift SVN r26839
'x is P' works now, and this function isn't used anywhere except by a test that exercises it. Removing this also lets us remove a swath of otherwise unused helper static functions in the runtime.
Swift SVN r26618
Teach ExistentialTypeMetadata how to project out the value pointer, type metadata, and protocol witness table from ErrorType containers. NFC yet; the dynamic casting and reflection machinery needs further work to correctly handle ErrorType boxes.
Swift SVN r26509
First, on x86-64 Linux does not reserve lower 2 Gb of the address space,
and a space saving trick in the runtime did not work properly, confusing
pointers and failure generation numbers together.
Second, we ignored protocol conformances inside the executable (only
considered shared libraries).
Swift SVN r25972
The standard library has grown significantly, and we need a new
directory structure that clearly reflects the role of the APIs, and
allows future growth.
See stdlib/{public,internal,private}/README.txt for more information.
Swift SVN r25876
