Method run

commands/FBClassDump.py:134–203

(self, arguments, options)

        ]

    def run(self, arguments, options):
        block = arguments[0]

        # http://clang.llvm.org/docs/Block-ABI-Apple.html
        tmpString = """
        enum {
          BLOCK_HAS_COPY_DISPOSE =  (1 << 25),
          BLOCK_HAS_CTOR =          (1 << 26), // helpers have C++ code
          BLOCK_IS_GLOBAL =         (1 << 28),
          BLOCK_HAS_STRET =         (1 << 29), // IFF BLOCK_HAS_SIGNATURE
          BLOCK_HAS_SIGNATURE =     (1 << 30),
        };
        struct Block_literal_1 {
          void *isa; // initialized to &_NSConcreteStackBlock or &_NSConcreteGlobalBlock
          int flags;
          int reserved;
          void (*invoke)(void *, ...);
          struct Block_descriptor_1 {
              unsigned long int reserved; // NULL
              unsigned long int size;         // sizeof(struct Block_literal_1)
              // optional helper functions
              void (*copy_helper)(void *dst, void *src);     // IFF (1<<25)
              void (*dispose_helper)(void *src);             // IFF (1<<25)
              // required ABI.2010.3.16
              const char *signature;                         // IFF (1<<30)
          } *descriptor;
          // imported variables
        };
        struct Block_literal_1 real = *((__bridge struct Block_literal_1 *)$block);
        NSMutableDictionary *dict = (id)[NSMutableDictionary dictionary];
        
        [dict setObject:(id)[NSNumber numberWithLong:(long)real.invoke] forKey:@"invoke"];
        
        if (real.flags & BLOCK_HAS_SIGNATURE) {
          char *signature;
          if (real.flags & BLOCK_HAS_COPY_DISPOSE) {
              signature = (char *)(real.descriptor)->signature;
          } else {
              signature = (char *)(real.descriptor)->copy_helper;
          }

          NSMethodSignature *sig = [NSMethodSignature signatureWithObjCTypes:signature];
          NSMutableArray *types = [NSMutableArray array];

          [types addObject:(id)[NSString stringWithUTF8String:(char *)[sig methodReturnType]]];

          for (NSUInteger i = 0; i < sig.numberOfArguments; i++) {
              char *type = (char *)[sig getArgumentTypeAtIndex:i];
              [types addObject:(id)[NSString stringWithUTF8String:type]];
          }
          
          [dict setObject:types forKey:@"signature"];
        }
        
        RETURN(dict);
        """
        command = string.Template(tmpString).substitute(block=block)
        json = fb.evaluate(command)