detached 763bb99

objc: clarify SendSuper method lookup (#514)

Document that SendSuper uses objc_msgSendSuper2, which takes the
current class and starts method lookup at its superclass. Explain
why objc_super.superClass contains the receiver's own class.

Closes #509
commit
763bb996ee5bc7661be7c7d59fb8f5bf53bc10c5
author
Hiroki KUMAZAKI · · 2026-09-05 12:39 UTC
committer
GitHub · · 2026-09-05 12:39 UTC
parent
7e3b362
signature
GPG UnverifiedB5690EEEBB952194 The key is unknown
1 file · +5 -2
Unified
UnifiedSplit
M objc/objc_runtime_darwin.go +5 -2
@@ -172,8 +172,11 @@ func Send[T any](id ID, sel SEL, args ...any) T {
172172 }
173173
174174 // objc_super data structure is generated by the Objective-C compiler when it encounters the super keyword
175-// as the receiver of a message. It specifies the class definition of the particular superclass that should
176-// be messaged.
175+// as the receiver of a message.
176+//
177+// [SendSuper] calls objc_msgSendSuper2 instead of objc_msgSendSuper. Unlike objc_msgSendSuper, which expects
178+// the superclass to message, objc_msgSendSuper2 expects the current class and begins looking the method up
179+// in its superclass by itself, so the receiver's own class is what belongs in superClass.
177180 type objc_super struct {
178181 _ structs.HostLayout
179182 receiver ID
@@ -172,8 +172,11 @@ func Send[T any](id ID, sel SEL, args ...any) T {
172 }172 }
173 173
174 // objc_super data structure is generated by the Objective-C compiler when it encounters the super keyword174 // objc_super data structure is generated by the Objective-C compiler when it encounters the super keyword
175-// as the receiver of a message. It specifies the class definition of the particular superclass that should175+// as the receiver of a message.
176-// be messaged.176+//
177+// [SendSuper] calls objc_msgSendSuper2 instead of objc_msgSendSuper. Unlike objc_msgSendSuper, which expects
178+// the superclass to message, objc_msgSendSuper2 expects the current class and begins looking the method up
179+// in its superclass by itself, so the receiver's own class is what belongs in superClass.
177 type objc_super struct {180 type objc_super struct {
178 _ structs.HostLayout181 _ structs.HostLayout
179 receiver ID182 receiver ID

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