objc: add protocol support (#46)

needed for ebitengien#2326

commit: aa1b0f680473761735af9ba5c3c0ee717fdb39db
author: TotallyGamerJet · 4y ago · 2022-09-15 04:40 UTC
committer: GitHub · 4y ago · 2022-09-15 04:40 UTC
parent: 02d7b30
signature: GPG Unverified4AEE18F83AFDEB23 The key is unknown

1 file · +22 -0

M objc/objc_runtime_darwin.go +22 -0


@@ -25,6 +25,7 @@ var (
25	25		objc_msgSend = purego.Dlsym(objc, "objc_msgSend")
26	26		objc_msgSendSuper2 = purego.Dlsym(objc, "objc_msgSendSuper2")
27	27		objc_getClass = purego.Dlsym(objc, "objc_getClass")
	28	+	objc_getProtocol = purego.Dlsym(objc, "objc_getProtocol")
28	29		objc_allocateClassPair = purego.Dlsym(objc, "objc_allocateClassPair")
29	30		objc_registerClassPair = purego.Dlsym(objc, "objc_registerClassPair")
30	31		sel_registerName = purego.Dlsym(objc, "sel_registerName")

@@ -32,6 +33,7 @@ var (
32	33		class_getInstanceVariable = purego.Dlsym(objc, "class_getInstanceVariable")
33	34		class_addMethod = purego.Dlsym(objc, "class_addMethod")
34	35		class_addIvar = purego.Dlsym(objc, "class_addIvar")
	36	+	class_addProtocol = purego.Dlsym(objc, "class_addProtocol")
35	37		ivar_getOffset = purego.Dlsym(objc, "ivar_getOffset")
36	38		object_getClass = purego.Dlsym(objc, "object_getClass")
37	39		)

@@ -189,6 +191,14 @@ func (c Class) AddIvar(name string, ty interface{}, types string) bool {
189	191		return byte(ret) != 0
190	192		}
191	193
	194	+	// AddProtocol adds a protocol to a class.
	195	+	// Returns true if the protocol was added successfully, otherwise false (for example,
	196	+	// the class already conforms to that protocol).
	197	+	func (c Class) AddProtocol(protocol *Protocol) bool {
	198	+	ret, _, _ := purego.SyscallN(class_addProtocol, uintptr(c), uintptr(unsafe.Pointer(protocol)))
	199	+	return byte(ret) != 0
	200	+	}
	201	+
192	202		// InstanceVariable returns an Ivar data structure containing information about the instance variable specified by name.
193	203		func (c Class) InstanceVariable(name string) Ivar {
194	204		n := strings.CString(name)

@@ -215,6 +225,18 @@ func (i Ivar) Offset() uintptr {
215	225		return ret
216	226		}
217	227
	228	+	// Protocol is a type that declares methods that can be implemented by any class.
	229	+	type Protocol uintptr
	230	+
	231	+	// GetProtocol returns the protocol for the given name or nil if there is no protocol by that name.
	232	+	func GetProtocol(name string) *Protocol {
	233	+	n := strings.CString(name)
	234	+	p, _, _ := purego.SyscallN(objc_getProtocol, uintptr(unsafe.Pointer(n)))
	235	+	runtime.KeepAlive(n)
	236	+	// We take the address and then dereference it to trick go vet from creating a possible miss-use of unsafe.Pointer
	237	+	return (*Protocol)(unsafe.Pointer(&p))
	238	+	}
	239	+
218	240		// IMP is a function pointer that can be called by Objective-C code.
219	241		type IMP uintptr
220	242


@@ -25,6 +25,7 @@ var (
25	objc_msgSend = purego.Dlsym(objc, "objc_msgSend")	25		objc_msgSend = purego.Dlsym(objc, "objc_msgSend")
26	objc_msgSendSuper2 = purego.Dlsym(objc, "objc_msgSendSuper2")	26		objc_msgSendSuper2 = purego.Dlsym(objc, "objc_msgSendSuper2")
27	objc_getClass = purego.Dlsym(objc, "objc_getClass")	27		objc_getClass = purego.Dlsym(objc, "objc_getClass")
		28	+	objc_getProtocol = purego.Dlsym(objc, "objc_getProtocol")
28	objc_allocateClassPair = purego.Dlsym(objc, "objc_allocateClassPair")	29		objc_allocateClassPair = purego.Dlsym(objc, "objc_allocateClassPair")
29	objc_registerClassPair = purego.Dlsym(objc, "objc_registerClassPair")	30		objc_registerClassPair = purego.Dlsym(objc, "objc_registerClassPair")
30	sel_registerName = purego.Dlsym(objc, "sel_registerName")	31		sel_registerName = purego.Dlsym(objc, "sel_registerName")

@@ -32,6 +33,7 @@ var (
32	class_getInstanceVariable = purego.Dlsym(objc, "class_getInstanceVariable")	33		class_getInstanceVariable = purego.Dlsym(objc, "class_getInstanceVariable")
33	class_addMethod = purego.Dlsym(objc, "class_addMethod")	34		class_addMethod = purego.Dlsym(objc, "class_addMethod")
34	class_addIvar = purego.Dlsym(objc, "class_addIvar")	35		class_addIvar = purego.Dlsym(objc, "class_addIvar")
		36	+	class_addProtocol = purego.Dlsym(objc, "class_addProtocol")
35	ivar_getOffset = purego.Dlsym(objc, "ivar_getOffset")	37		ivar_getOffset = purego.Dlsym(objc, "ivar_getOffset")
36	object_getClass = purego.Dlsym(objc, "object_getClass")	38		object_getClass = purego.Dlsym(objc, "object_getClass")
37	)	39		)

@@ -189,6 +191,14 @@ func (c Class) AddIvar(name string, ty interface{}, types string) bool {
189	return byte(ret) != 0	191		return byte(ret) != 0
190	}	192		}
191		193
		194	+	// AddProtocol adds a protocol to a class.
		195	+	// Returns true if the protocol was added successfully, otherwise false (for example,
		196	+	// the class already conforms to that protocol).
		197	+	func (c Class) AddProtocol(protocol *Protocol) bool {
		198	+	ret, _, _ := purego.SyscallN(class_addProtocol, uintptr(c), uintptr(unsafe.Pointer(protocol)))
		199	+	return byte(ret) != 0
		200	+	}
		201	+
192	// InstanceVariable returns an Ivar data structure containing information about the instance variable specified by name.	202		// InstanceVariable returns an Ivar data structure containing information about the instance variable specified by name.
193	func (c Class) InstanceVariable(name string) Ivar {	203		func (c Class) InstanceVariable(name string) Ivar {
194	n := strings.CString(name)	204		n := strings.CString(name)

@@ -215,6 +225,18 @@ func (i Ivar) Offset() uintptr {
215	return ret	225		return ret
216	}	226		}
217		227
		228	+	// Protocol is a type that declares methods that can be implemented by any class.
		229	+	type Protocol uintptr
		230	+
		231	+	// GetProtocol returns the protocol for the given name or nil if there is no protocol by that name.
		232	+	func GetProtocol(name string) *Protocol {
		233	+	n := strings.CString(name)
		234	+	p, _, _ := purego.SyscallN(objc_getProtocol, uintptr(unsafe.Pointer(n)))
		235	+	runtime.KeepAlive(n)
		236	+	// We take the address and then dereference it to trick go vet from creating a possible miss-use of unsafe.Pointer
		237	+	return (*Protocol)(unsafe.Pointer(&p))
		238	+	}
		239	+
218	// IMP is a function pointer that can be called by Objective-C code.	240		// IMP is a function pointer that can be called by Objective-C code.
219	type IMP uintptr	241		type IMP uintptr
220		242