Add print capture variables for pblock

before:
Imp: 0x10a451d40    Signature: void ^();

after:
Imp: 0x10a451d40    Signature: void ^()   Variables : {
<ViewController: 0x7fdd9b204060>
<AppDelegate: 0x60c00002acc0>
};

Author: 董宏昌

commands/FBClassDump.py

@@ -139,17 +139,108 @@ def run(self, arguments, options):
     command = string.Template(tmpString).substitute(block=block)
     json = fb.evaluate(command)
 
+    variables_json = self.getBlockVariables(block)
+    if variables_json is not None:
+      json.update(variables_json)
+
+    variablesStrs = []
+    for i in range(10):
+      varKey = 'variables['+str(i)+']'
+      if varKey in json:
+        variablesStrs.append(json[varKey])
+    variablesStr = '\n'.join(variablesStrs)
+
     signature = json['signature']
     if not signature:
-      print 'Imp: ' + hex(json['invoke'])
+      print 'Imp: ' + hex(json['invoke']) + '   Variables : {\n'+variablesStr+'\n};'
       return 
 
     sigStr = '{} ^('.format(decode(signature[0]))
     # the block`s implementation always take the block as it`s first argument, so we ignore it
     sigStr += ', '.join([decode(m) for m in signature[2:]])
-    sigStr += ');'
+    sigStr += ')'
 
-    print  'Imp: ' + hex(json['invoke']) + '    Signature: ' + sigStr
+    print  'Imp: ' + hex(json['invoke']) + '    Signature: ' + sigStr + '   Variables : {\n'+variablesStr+'\n};'
+
+  def getBlockVariables(self, block, min_var_count=1, max_var_count=20):
+    '''
+    no __Block_byref_xxx
+    '''
+
+    # http://clang.llvm.org/docs/Block-ABI-Apple.html
+    tmpString = """
+    #define BLOCK_VARIABLES_COUNT ($variables_count)
+    enum {
+      BLOCK_HAS_COPY_DISPOSE =  (1 << 25),
+      BLOCK_HAS_CTOR =          (1 << 26), // helpers have C++ code
+      BLOCK_IS_GLOBAL =         (1 << 28),
+      BLOCK_HAS_STRET =         (1 << 29), // IFF BLOCK_HAS_SIGNATURE
+      BLOCK_HAS_SIGNATURE =     (1 << 30),
+    };
+    struct Block_literal_1 {
+      void *isa; // initialized to &_NSConcreteStackBlock or &_NSConcreteGlobalBlock
+      int flags;
+      int reserved;
+      void (*invoke)(void *, ...);
+      struct Block_descriptor_1 {
+          unsigned long int reserved; // NULL
+          unsigned long int size;         // sizeof(struct Block_literal_1)
+          // optional helper functions
+          void (*copy_helper)(void *dst, void *src);     // IFF (1<<25)
+          void (*dispose_helper)(void *src);             // IFF (1<<25)
+          // required ABI.2010.3.16
+          const char *signature;                         // IFF (1<<30)
+      } *descriptor;
+      // imported variables
+      Class *variables[BLOCK_VARIABLES_COUNT];
+    };
+    struct Block_literal_1 real = *((__bridge struct Block_literal_1 *)$block);
+    NSMutableDictionary *dict = (id)[NSMutableDictionary dictionary];
+
+    // Get the list of classes and look for testPointerClass
+    NSInteger numClasses = objc_getClassList(NULL, 0);
+    Class *classesList = (Class*)malloc(sizeof(Class) * numClasses);
+    numClasses = objc_getClassList(classesList, numClasses);
+
+    Class **blockVariables = real.variables;
+    for (int i = 0; i < BLOCK_VARIABLES_COUNT; i++) {
+        Class *obj = (Class*)blockVariables[i];
+        if (obj == NULL) {
+            break;
+        }
+
+        Class testPointerClass = (Class)(*obj);
+        BOOL isClass = NO;
+        for (int i = 0; i < numClasses; i++)
+        {
+            if (classesList[i] == testPointerClass)
+            {
+                isClass = YES;
+                break;
+            }
+        }
+        if (!isClass) {
+            break;
+        }
+
+        NSString *key = [NSString stringWithFormat:@"variables[%d]", i];
+        NSString *value = [NSString stringWithFormat:@"%@", obj];
+        [dict setValue:value forKey:key];
+    }
+
+    free(classesList);
+
+    RETURN(dict);
+    """
+    last_json = None
+    for i in range(min_var_count, max_var_count):
+      command = string.Template(tmpString).substitute(block=block, variables_count=i)
+      json = fb.evaluate(command, printErrors=False)
+      if json is not None:
+        last_json = json
+      else:
+        break
+    return last_json
 
 # helpers 
 def isClassObject(arg):
@@ -302,20 +393,20 @@ def getProperties(klass):
           NSMutableDictionary *dict = (id)[NSMutableDictionary dictionary];
           
           char *name = (char *)property_getName(props[i]);
-          [dict setObject:(id)[NSString stringWithUTF8String:name] forKey:@"name"];
+          [dict setValue:(id)[NSString stringWithUTF8String:name] forKey:@"name"];
           
           char *attrstr = (char *)property_getAttributes(props[i]);
-          [dict setObject:(id)[NSString stringWithUTF8String:attrstr] forKey:@"attributes_string"];
+          [dict setValue:(id)[NSString stringWithUTF8String:attrstr] forKey:@"attributes_string"];
           
           NSMutableDictionary *attrsDict = (id)[NSMutableDictionary dictionary];
           unsigned int pcount;
           objc_property_attribute_t *attrs = (objc_property_attribute_t *)property_copyAttributeList(props[i], &pcount);
           for (int i = 0; i < pcount; i++) {
               NSString *name = (id)[NSString stringWithUTF8String:(char *)attrs[i].name];
               NSString *value = (id)[NSString stringWithUTF8String:(char *)attrs[i].value];
-              [attrsDict setObject:value forKey:name];
+              [attrsDict setValue:value forKey:name];
           }
-          [dict setObject:attrsDict forKey:@"attributes"];
+          [dict setValue:attrsDict forKey:@"attributes"];
           
           [result addObject:dict];
       }

fblldbbase.py

@@ -168,21 +168,23 @@ def check_expr(expr):
 # Example:
 #       >>> fblldbbase.evaluate('NSString *str = @"hello world"; RETURN(@{@"key": str});')
 #       {u'key': u'hello world'}
-def evaluate(expr):
+def evaluate(expr, printErrors=True):
   if not check_expr(expr):
     raise Exception("Invalid Expression, the last expression not include a RETURN family marco")
 
   command = "({" + RETURN_MACRO + '\n' + expr + "})"
-  ret = evaluateExpressionValue(command, printErrors=True)
+  ret = evaluateExpressionValue(command, printErrors=printErrors)
   if not ret.GetError().Success():
-    print ret.GetError()
+    if printErrors:
+      print ret.GetError()
     return None
   else:
     process = lldb.debugger.GetSelectedTarget().GetProcess()
     error = lldb.SBError()
     ret = process.ReadCStringFromMemory(int(ret.GetValue(), 16), 2**20, error)
     if not error.Success():
-      print error
+      if printErrors:
+        print error
       return None
     else:
       ret = json.loads(ret)