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[ObjC][Gen] Emit ObjC strings to respective sections (#84300)

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Clang emits ObjC strings into special sections

d5e7c27d53/clang/lib/CodeGen/CGObjCMac.cpp (L4056-L4072)

As far as I can tell from `CGObjCMac.cpp`:
* types go into `__objc_methtype`
* class, category, and protocol names go into `__objc_classname`
* method names, property names, and property types go into
`__objc_methname`

See also https://github.com/swiftlang/swift/pull/84236.
This commit is contained in:
Ellis Hoag
2025-09-30 08:42:11 -07:00
committed by GitHub
parent 48fdd9980e
commit 2c919e138e
10 changed files with 134 additions and 76 deletions
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25
lib/IRGen/GenClass.cpp
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@@ -1464,7 +1464,8 @@ namespace {
// struct category_t {
// char const *name;
fields.add(IGM.getAddrOfGlobalString(CategoryName));
fields.add(IGM.getAddrOfGlobalString(CategoryName,
CStringSectionType::ObjCClassName));
// const class_t *theClass;
fields.add(getClassMetadataRef());
// const method_list_t *instanceMethods;
@@ -1503,7 +1504,8 @@ namespace {
// Class super;
fields.addNullPointer(IGM.Int8PtrTy);
// char const *name;
fields.add(IGM.getAddrOfGlobalString(getEntityName(nameBuffer)));
fields.add(IGM.getAddrOfGlobalString(getEntityName(nameBuffer),
CStringSectionType::ObjCClassName));
// const protocol_list_t *baseProtocols;
fields.add(buildProtocolList(weakLinkage));
// const method_list_t *requiredInstanceMethods;
@@ -1724,7 +1726,8 @@ namespace {
}
llvm::SmallString<64> buffer;
Name = IGM.getAddrOfGlobalString(getClass()->getObjCRuntimeName(buffer));
Name = IGM.getAddrOfGlobalString(getClass()->getObjCRuntimeName(buffer),
CStringSectionType::ObjCClassName);
return Name;
}
@@ -2088,11 +2091,10 @@ namespace {
else
fields.addNullPointer(IGM.PtrTy);
// TODO: clang puts this in __TEXT,__objc_methname,cstring_literals
fields.add(IGM.getAddrOfGlobalString(name));
// TODO: clang puts this in __TEXT,__objc_methtype,cstring_literals
fields.add(IGM.getAddrOfGlobalString(typeEnc));
fields.add(
IGM.getAddrOfGlobalString(name, CStringSectionType::ObjCMethodName));
fields.add(IGM.getAddrOfGlobalString(typeEnc,
CStringSectionType::ObjCMethodType));
Size size;
Alignment alignment;
@@ -2228,8 +2230,11 @@ namespace {
buildPropertyAttributes(prop, propertyAttributes);
auto fields = properties.beginStruct();
fields.add(IGM.getAddrOfGlobalString(prop->getObjCPropertyName().str()));
fields.add(IGM.getAddrOfGlobalString(propertyAttributes));
fields.add(
IGM.getAddrOfGlobalString(prop->getObjCPropertyName().str(),
CStringSectionType::ObjCPropertyName));
fields.add(IGM.getAddrOfGlobalString(
propertyAttributes, CStringSectionType::ObjCPropertyName));
fields.finishAndAddTo(properties);
}