averello/swift-mirror
1
0
Fork 0
mirror of https://github.com/apple/swift.git synced 2025-12-14 20:36:38 +01:00
Code Issues Packages Projects Releases Wiki Activity

SIL: Introduce a new @inout_aliasable parameter convention.

Browse Source 
Modeling nonescaping captures as @inout parameters is wrong, because captures are allowed to share state, unlike 'inout' parameters, which are allowed to assume to some degree that there are no aliases during the parameter's scope. To model this, introduce a new @inout_aliasable parameter convention to indicate an indirect parameter that can be written to, not only by the current function, but by well-typed, well-synchronized aliasing accesses too. (This is unrelated to our discussions of adding a "type-unsafe-aliasable" annotation to pointer_to_address to allow for safe pointer punning.)
This commit is contained in:
Joe Groff
2015-11-25 12:41:45 -08:00
parent 6b55e87d2f
commit b1667ec705
36 changed files with 161 additions and 88 deletions
Download Patch File Download Diff File Expand all files Collapse all files

5
include/swift/Serialization/ModuleFormat.h
View File

@@ -51,7 +51,7 @@ const uint16_t VERSION_MAJOR = 0;
/// To ensure that two separate changes don't silently get merged into one
/// in source control, you should also update the comment to briefly
/// describe what change you made.
const uint16_t VERSION_MINOR = 222; // Last change: @_fixed_layout
const uint16_t VERSION_MINOR = 223; // Last change: SIL @inout_aliasable
using DeclID = Fixnum<31>;
using DeclIDField = BCFixed<31>;
@@ -179,13 +179,14 @@ enum class ParameterConvention : uint8_t {
Indirect_In,
Indirect_Out,
Indirect_Inout,
Indirect_InoutAliasable,
Direct_Owned,
Direct_Unowned,
Direct_Guaranteed,
Indirect_In_Guaranteed,
Direct_Deallocating,
};
using ParameterConventionField = BCFixed<3>;
using ParameterConventionField = BCFixed<4>;
// These IDs must \em not be renumbered or reordered without incrementing
// VERSION_MAJOR.