shafik added a comment.
@aprantl I think this Objective-C Runtime Programming Guide: Bye Encodings
<https://developer.apple.com/library/archive/documentation/Cocoa/Conceptual/ObjCRuntimeGuide/Articles/ocrtTypeEncodings.html>
entry and this sample program answer the rest of your questions:
#include <Foundation/Foundation.h>
#include <objc/runtime.h>
@interface Bits: NSObject {
int a: 1;
int b: 2;
int c: 3;
double x;
int f: 23;
int e: 4;
}
@end
@implementation Bits @end
int main() {
Ivar *ivars = class_copyIvarList([Bits class], NULL);
for (Ivar *c = ivars; *c; c++) {
printf("%s %s %ld\n", ivar_getName(*c), ivar_getTypeEncoding(*c),
ivar_getOffset(*c));
}
free(ivars);
}
with the following output:
a b1 8
b b2 8
c b3 8
x d 16
f b23 24
e b4 26
a b1 8
a is a bit-field of size 1 with offset 8
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D83433/new/
https://reviews.llvm.org/D83433
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