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Add a swift3_migration attribute to describe how an API gets migrated.

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Introduce a new attribute, swift3_migration, that lets us describe the
transformation required to map a Swift 2.x API into its Swift 3
equivalent. The only transformation understood now is "renamed" (to
some other declaration name), but there's a message field where we can
record information about other changes. The attribute can grow
somewhat (e.g., to represent parameter reordering) as we need it.

Right now, we do nothing but store and validate this attribute.
This commit is contained in:
Doug Gregor
2016-01-13 16:18:47 -08:00
parent 83412bc219
commit 67c81154af
22 changed files with 424 additions and 101 deletions
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10
include/swift/Serialization/ModuleFormat.h
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@@ -52,7 +52,7 @@ const uint16_t VERSION_MAJOR = 0;
/// in source control, you should also update the comment to briefly
/// describe what change you made. The content of this comment isn't important;
/// it just ensures a conflict if two people change the module format.
const uint16_t VERSION_MINOR = 233; // superclass requirement kind
const uint16_t VERSION_MINOR = 234; // swift3_migration attribute added
using DeclID = Fixnum<31>;
using DeclIDField = BCFixed<31>;
@@ -1344,6 +1344,14 @@ namespace decls_block {
BCArray<IdentifierIDField>
>;
using Swift3MigrationDeclAttrLayout = BCRecordLayout<
Swift3Migration_DECL_ATTR,
BCFixed<1>, // implicit flag
BCVBR<5>, // number of bytes in rename string
BCVBR<5>, // number of bytes in message string
BCBlob // rename, followed by message
>;
using WarnUnusedResultDeclAttrLayout = BCRecordLayout<
WarnUnusedResult_DECL_ATTR,
BCFixed<1>, // implicit flag