Fix return struct bug.

BlockHook/BlockHook.m

@@ -192,7 +192,9 @@ static void BHFFIClosureFunc(ffi_cif *cif, void *ret, void **args, void *userdat
 {
     BHToken *token = (__bridge BHToken *)(userdata);
     if (token.hasStret) {
-        token.retValue = args[0];
+        // The first arg contains address of a pointer of returned struct.
+        token.retValue = *((void **)args[0]);
+        // Other args move backwards.
         token.args = args + 1;
     }
     else {

BlockHookSample iOS/ViewController.m

@@ -16,10 +16,4 @@ - (void)viewDidLoad {
     // Do any additional setup after loading the view, typically from a nib.
 }
 
-- (void)didReceiveMemoryWarning {
-    [super didReceiveMemoryWarning];
-    // Dispose of any resources that can be recreated.
-}
-
-
 @end

BlockHookSample iOSTests/BlockHookSample_iOSTests.m

@@ -62,7 +62,7 @@ struct TestStruct (^StructReturnBlock)(int) = ^(int x)
 
     [StructReturnBlock block_hookWithMode:BlockHookModeInstead usingBlock:^(BHToken *token, int x){
         [token invokeOriginalBlock];
-        (**(struct TestStruct **)(token.retValue)).a = 100;
+        (*(struct TestStruct *)(token.retValue)).a = 100;
         NSAssert(x == 8, @"Wrong arg!");
     }];
 

BlockHookSample macOS/ViewController.m

@@ -9,43 +9,10 @@
 #import "ViewController.h"
 #import <BlockHook/BlockHook.h>
 
-struct Block_descriptor {
-    void *reserved;
-    uintptr_t size;
-};
-
-struct Block_layout {
-    void *isa;
-    int32_t flags; // contains ref count
-    int32_t reserved;
-    void  *invoke;
-    struct Block_descriptor *descriptor;
-};
 @implementation ViewController
 
 - (void)viewDidLoad {
     [super viewDidLoad];
-    struct Block_layout (^testblock3)(int) = ^(int a)
-    {
-        NSLog(@"This is a Global block for stret");
-        return (struct Block_layout){0,1,2,0,0};
-    };
-    [testblock3 block_hookWithMode:BlockHookModeInstead usingBlock:^(BHToken *token, int a){
-        [token invokeOriginalBlock];
-        struct Block_layout lala = **(struct Block_layout **)(token.retValue);
-        NSLog(@"lala flag:%d", lala.reserved);
-        NSLog(@"arg a:%d", a);
-    }];
-    struct Block_layout result = testblock3(100);
-    result.flags;
-}
-
-
-- (void)setRepresentedObject:(id)representedObject {
-    [super setRepresentedObject:representedObject];
-
-    // Update the view, if already loaded.
 }
 
-
 @end

BlockHookSample macOSTests/BlockHookSample_macOSTests.m

@@ -67,7 +67,7 @@ struct TestStruct (^StructReturnBlock)(int) = ^(int x)
 
     [StructReturnBlock block_hookWithMode:BlockHookModeInstead usingBlock:^(BHToken *token, int x){
         [token invokeOriginalBlock];
-        (**(struct TestStruct **)(token.retValue)).a = 100;
+        (*(struct TestStruct *)(token.retValue)).a = 100;
         NSAssert(x == 8, @"Wrong arg!");
     }];