The code looks proper and your calling convention handling is, to my eyes, perfectly correct.

I think you may have ran into a possible/rumoured bug in Apple&#39;s ARM clang where calling a static function (which may happen behind the scenes e.g. for type conversion) from a static function may cause stack corruption. You&#39;re not doing so directly, but extern functions may be implemented through a stub which calls an anonymous static function containing the implementation.

You can try having your extern function be a wrapper which only calls a non-static implementation function instead.

I am new to Elasticsearch and am currently working on implementing a `geo_distance` filter for searching. As of now my index has the following mapping (I&#39;ve removed some fields):

    {
    advert_index: {
       mappings: {
          advert_type: {
             properties: {
                __v: {
                   type: &quot;long&quot;
                },
                caption: {
                   type: &quot;string&quot;
                },
                category: {
                   type: &quot;string&quot;
                },
                **location: {
                type: &quot;long&quot;
                },**
  
             }
          }
       }
    }

The geo_distance field is going to be implemented on the location field, where an example instance looks like this: 

    &quot;location&quot;: [
                   71,
                   60
                ],
I.e. is on geoJSON format `[lon, lat]`. 

I understand that I will have to update my index so that the location field is of type `geo_point`, as described in the documentation (&lt;a href=&quot;http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/mapping-geo-point-type.html&quot;&gt;mapping-geo-point&lt;/a&gt;). It seems like I have to drop the index and create a new one, but I am not able to do this. 

Am I on the right track? I would greatly appreciate it if anyone could help me with how I could create a new index or update my existing one with the correct data type. 

Many thanks!

Create or update mapping in elasticsearch

I&#39;m trying to create an `std::function` from a move-capturing lambda expression. Note that I can create a move-capturing lambda expression without problems; it&#39;s only when I try to wrap it in an `std::function` that I get an error.

For example:

    auto pi = std::make_unique&lt;int&gt;(0);

    // no problems here!
    auto foo = [q = std::move(pi)] {
        *q = 5;
        std::cout &lt;&lt; *q &lt;&lt; std::endl;
    };

    // All of the attempts below yield:
    // &quot;Call to implicitly-deleted copy constructor of &#39;&lt;lambda....&quot;

    std::function&lt;void()&gt; bar = foo;
    std::function&lt;void()&gt; bar{foo};
    std::function&lt;void()&gt; bar{std::move(foo)};
    std::function&lt;void()&gt; bar = std::move(foo);
    std::function&lt;void()&gt; bar{std::forward&lt;std::function&lt;void()&gt;&gt;(foo)};
    std::function&lt;void()&gt; bar = std::forward&lt;std::function&lt;void()&gt;&gt;(foo);

I&#39;ll explain why I want to write something like this. I&#39;ve written a UI library which, similar to jQuery or JavaFX, allows the user to handle mouse/keyboard events by passing `std::function`s to methods with names like `on_mouse_down()`, `on_mouse_drag()`, `push_undo_action()`, etc. 

Obviously, the `std::function` I want to pass in should ideally use a move-capturing lambda expression, otherwise I need to resort to the ugly &quot;release/acquire-in-lambda&quot; idiom I was using when C++11 was the standard:

    std::function&lt;void()&gt; baz = [q = pi.release()] {
        std::unique_ptr&lt;int&gt; p{q};
        *p = 5;
        std::cout &lt;&lt; *q &lt;&lt; std::endl;
    };
 
Note that calling `baz` twice would be an error in the above code. However, in my code, this closure is guaranteed to be called exactly once.

BTW, in my real code, I&#39;m not passing an `std::unique_ptr&lt;int&gt;`, but something more interesting.

Finally, I&#39;m using Xcode6-Beta4 which uses the following version of clang:

    Apple LLVM version 5.1 (clang-503.0.40) (based on LLVM 3.4svn)
    Target: x86_64-apple-darwin13.3.0
    Thread model: posix


How to create an std::function from a move-capturing lambda expression?

I&#39;ve built an App on Android using Delphi XE6 that requires C code. However on iOS I cannot make it work. I suspect the problem is related to arm/thumb status, but I am not sure. There is no problem in either system to call the C code from Pascal. But if the C code calls back a Pascal procedure iOS generates a `&quot;bad system call (12)&quot;`

Here is the pascal code:

    function testarm(a,b:integer):integer; cdecl; external &quot;testC.o&quot;;
        
    Procedure testC;
    Begin
      testarm(1,2);
    end;
            
    function BackToPascal(a,b:integer): integer; cdecl;
      Begin
      result := a+b;
    end;
        
    ......
        
    exports
      BackToPascal;
        

And here is the C code:

    extern int BackToPascal(int a,int b);
    
    extern int testarm(int a,int b)
    {
       int i;
       i = BackToPascal(a,b);
       return i+1;
    }

On android this is how I am compiling (It is working):

    ...&quot;arm-linux-androideabi-gcc.exe&quot; -c test.c -o test.o -O3 -mfloat-abi=softfp -mfpu=neon -marm -march=armv7-a -mtune=cortex-a8

On ios:

    xcrun -sdk iphoneos clang -c -arch armv7 test.c -O3 -mfpu=neon -mtune=cortex-a8 -marm -march=armv7-a -mfloat-abi=softfp

I suspect that my xcode settings are wrong but I cannot figure out why.

When I debug, the error comes when calling `testC` in `testarm` when calling `BackToPascal` ( on &quot;bl 0x8b8390 Xgobj.BackToPascal (int, int)&quot; ). On Android it works perfect however the `bl` does not call directly `BackToPascal`, but the following code:

    75A82D94 12C68FE2         add r12, pc, #18874368 ; 0x1200000
    75A82D98 73CA8CE2         add r12, r12, #471040 ; 0x73000
    75A82D9C 40F2BCE5         ldr pc, [r12, #576]! ; 0x240

Which get into `BackToPascal` 



Delphi XE6 link C code in iOS

I've built an App on Android using Delphi XE6 that requires C code. However on iOS I cannot make it work. I suspect the problem is related to arm/thumb status, but I am not sure. There is no problem in either system to call the C code from Pascal. But if the C code calls back a Pascal procedure iOS generates a <code>"bad system call (12)"</code>
Here is the pascal code:
<pre><code class="hljs language-sql">function testarm(a,b:integer):integer; cdecl; external "testC.o";
 
Procedure testC;
Begin
 testarm(1,2);
end;
 
function BackToPascal(a,b:integer): integer; cdecl;
 Begin
 result := a+b;
end;
 
......
 
exports
 BackToPascal;
 
</code></pre>
And here is the C code:
<pre><code class="hljs language-arduino">extern int BackToPascal(int a,int b);

extern int testarm(int a,int b)
{
 int i;
 i = BackToPascal(a,b);
 return i+1;
}
</code></pre>
On android this is how I am compiling (It is working):
<pre><code class="hljs language-ini">..."arm-linux-androideabi-gcc.exe" -c test.c -o test.o -O3 -mfloat-abi=softfp -mfpu=neon -marm -march=armv7-a -mtune=cortex-a8
</code></pre>
On ios:
<pre><code class="hljs language-ini">xcrun -sdk iphoneos clang -c -arch armv7 test.c -O3 -mfpu=neon -mtune=cortex-a8 -marm -march=armv7-a -mfloat-abi=softfp
</code></pre>
I suspect that my xcode settings are wrong but I cannot figure out why.
When I debug, the error comes when calling <code>testC</code> in <code>testarm</code> when calling <code>BackToPascal</code> ( on "bl 0x8b8390 Xgobj.BackToPascal (int, int)" ). On Android it works perfect however the <code>bl</code> does not call directly <code>BackToPascal</code>, but the following code:
<pre><code class="hljs language-csharp">75A82D94 12C68FE2 add r12, pc, #18874368 ; 0x1200000
75A82D98 73CA8CE2 add r12, r12, #471040 ; 0x73000
75A82D9C 40F2BCE5 ldr pc, [r12, #576]! ; 0x240
</code></pre>
Which get into <code>BackToPascal</code>

Does anyone know how to validate an e-mail address in Swift? I found this code:

    - (BOOL) validEmail:(NSString*) emailString {
     
        if([emailString length]==0){
            return NO;
        }
     
        NSString *regExPattern = @&quot;[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,4}&quot;;
     
        NSRegularExpression *regEx = [[NSRegularExpression alloc] initWithPattern:regExPattern options:NSRegularExpressionCaseInsensitive error:nil];
        NSUInteger regExMatches = [regEx numberOfMatchesInString:emailString options:0 range:NSMakeRange(0, [emailString length])];
     
        NSLog(@&quot;%i&quot;, regExMatches);
        if (regExMatches == 0) {
            return NO;
        } else {
            return YES;
        }
    }

but I can&#39;t translate it to Swift.


How to validate an e-mail address in swift?

I have a coredata entity named Record and has a property dateUpdated. I noticed that the generated NSManagedObject subclass has no optional mark (?)

**CoreData Editor:**

![enter image description here][1]


**Generated Subclass:**

![enter image description here][2]

**Expected:**

![enter image description here][3]


  [1]: http://i.stack.imgur.com/mDD3a.png
  [2]: http://i.stack.imgur.com/L1YYw.png
  [3]: http://i.stack.imgur.com/9PwaM.png

**UPDATED:** 
It&#39;s **tedious** in my part, because each time I want to regenerate the subclasses, it means I also need to update all optional values manually. Having a non-optional (without &#39;?&#39;) in subclass lead me to check evalue before assigning, like example below:
   
    // sample value:
    // serverDateFormatter = &quot;yyyy/MM/dd&quot;
    // dateString = &quot;&quot;    

    // Branch is a subclass of Record (see above images)

    var date = self.coreData.serverDateFormatter.dateFromString(dateString)
    if date != nil
    {
       branch.dateUpdated = date 
    }

But if xcode can automatically set optional value in subclass with (?) I just need to do like this:

    branch.dateUpdated = self.coreData.serverUTCDateFormatter.dateFromString(dateString)
   
In my case, I have bunch of properties I need to mark as optional manually.

Swift + CoreData: Cannot Automatically Set Optional Attribute On Generated NSManagedObject Subclass

I am making a camera app. I need to test the app in the simulator but I can&#39;t access the iOS simulator camera.

If not possible in the simulator means I need to access my system camera. Whether it is possible? 

I tried `UIImagePickerController` but it doesn&#39;t work.

The below the code I&#39;ve tried.

    self.imagePicker = [[UIImagePickerController alloc] init];	
    UIImagePickerControllerSourceType sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
    self.usingPopover = YES;
    if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {
    sourceType = UIImagePickerControllerSourceTypeCamera;
    self.usingPopover = NO;
    }
    [self.imagePicker setSourceType:sourceType];
    self.imagePicker.allowsEditing = NO;
    self.imagePicker.delegate = self;
    if (sourceType != UIImagePickerControllerSourceTypeCamera) {
    self.popover = [[UIPopoverController alloc] initWithContentViewController:self.imagePicker];
    self.popover.delegate = self;
    [self.popover presentPopoverFromRect:popoverFrame inView:self.view  
    permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];
    } else {
    [self presentModalViewController:imagePicker animated:YES];    
    }

How to access iOS simulator camera

I&#39;m a .NET developer and want to write an IOS &amp; Android app in C#. I&#39;ve had a read around Xamarin for Visual Studio which looks interesting if not a tad expensive!

Do you need a Mac to debug your code? Do you just need a networked Mac to actually deploy the app to the Store?

Is the best option just to buy a Mac and run Windows with VS in a VM or can I just use my windows machine, write &amp; debug the code in Windows then just hook up to a networked Mac for final deployment?

Xamarin Visual Studio IOS Development Without a Mac?

I am writing my first iOS application (iPhone only) with Swift. The main application view should allow user to choose the image from the photo gallery. 

I&#39;ve found the following sample code of **ViewController.swift**:

    class ViewController: UIImagePickerController, UINavigationControllerDelegate, UIImagePickerControllerDelegate  {
                                
        override func viewDidLoad() {
            super.viewDidLoad()
            // Do any additional setup after loading the view, typically from a nib.
        }
    
        override func didReceiveMemoryWarning() {
            super.didReceiveMemoryWarning()
            // Dispose of any resources that can be recreated.
        }
    
        func tableView(tableView: UITableView!, didSelectRowAtIndexPath indexPath: NSIndexPath!) {
            
            var imagePickerController = UIImagePickerController()
            imagePickerController.delegate = self
            imagePickerController.sourceType = UIImagePickerControllerSourceType.SavedPhotosAlbum
            imagePickerController.allowsEditing = true
            self.presentViewController(imagePickerController, animated: true, completion: { imageP in
                
            })
        }
        
        
        func imagePickerController(picker: UIImagePickerController!, didFinishPickingImage image: UIImage!, editingInfo: NSDictionary!) {
            let selectedImage : UIImage = image
            println(selectedImage)
        }
    
    }

and have the following View Controller Scene -

    View Controller
     - Top Layout Guide
     - Bottom Layout Guide
     - View
       - Image View
    First Responder
    Exit

But when I start the app, just black screen is shown. What I am doing wrong?
Another [sample code][1] I&#39;ve found is in Objective-C, which doesn&#39;t help me.


  [1]: https://developer.apple.com/library/prerelease/ios/samplecode/PhotoPicker/Listings/PhotoPicker_APLViewController_m.html#//apple_ref/doc/uid/DTS40010196-PhotoPicker_APLViewController_m-DontLinkElementID_6

How to allow user to pick the image with Swift?

Given by a colleague as a puzzle, I cannot figure out how this C program actually compiles and runs. What is this `&gt;&gt;&gt;=` operator and the strange `1P1` literal? I have tested in Clang and GCC. There are no warnings and the output is &quot;???&quot;

    #include &lt;stdio.h&gt;

    int main()
    {
        int a[2]={ 10, 1 };
	
        while( a[ 0xFULL?&#39;\0&#39;:-1:&gt;&gt;&gt;=a&lt;:!!0X.1P1 ] )
            printf(&quot;?&quot;);
	
	    return 0;
    }

What is the &gt;&gt;&gt;= operator in C?

In my project there is a method which only returns a `const char*`, whereas I need a `char*` string, as the API doesn&#39;t accept `const char*`.

Any idea how to convert between `const char*` to `char*`?

How to convert const char* to char* in C?

In many programming competitions I have seen people write this type of `for`-loop

    for(i = 0; i &lt; (1 &lt;&lt; 7); i++)

Unless I am missing something, that&#39;s the same as

    for(i = 0; i &lt; 128; i++)

Why use the `(1 &lt;&lt; 7)` version?
&lt;br&gt;Isn&#39;t calculating the condition every time an unnecessary overhead?

Why an expression instead of a constant, in a C for-loop&#39;s conditional?

I&#39;m trying to convert [this][1] code snippet to Swift. I&#39;m struggling on getting off the ground due to some difficulties.

    - (BOOL) connectedToNetwork
    {
    	// Create zero addy
    	struct sockaddr_in zeroAddress;
    	bzero(&amp;zeroAddress, sizeof(zeroAddress));
    	zeroAddress.sin_len = sizeof(zeroAddress);
    	zeroAddress.sin_family = AF_INET;

    	// Recover reachability flags
    	SCNetworkReachabilityRef defaultRouteReachability = SCNetworkReachabilityCreateWithAddress(NULL, (struct sockaddr *)&amp;zeroAddress);
    	SCNetworkReachabilityFlags flags;

    	BOOL didRetrieveFlags = SCNetworkReachabilityGetFlags(defaultRouteReachability, &amp;flags);
    	CFRelease(defaultRouteReachability);

    	if (!didRetrieveFlags)
    	{
    		return NO;
    	}

    	BOOL isReachable = flags &amp; kSCNetworkFlagsReachable;
    	BOOL needsConnection = flags &amp; kSCNetworkFlagsConnectionRequired;

    	return (isReachable &amp;&amp; !needsConnection) ? YES : NO;
    }

The first and the main issue I&#39;m having is on how to define and work with C structs. In the first line (`struct sockaddr_in zeroAddress;`) of the above code, I think they&#39;re defining a instance called `zeroAddress` from the struct sockaddr_in(?), I assume. I tried declaring a `var` like this.

    var zeroAddress = sockaddr_in()

But I get the error **Missing argument for parameter &#39;sin_len&#39; in call** which is understandable because that struct takes a number of arguments. So I tried again.

    var zeroAddress = sockaddr_in(sin_len: sizeof(zeroAddress), sin_family: AF_INET, sin_port: nil, sin_addr: nil, sin_zero: nil)

As expected I get some other error **Variable used within its own initial value**. I understand the cause of that error too. In C, they declare the instance first and then fill up the parameters. Its not possible in Swift as far as I know. So I&#39;m truly lost at this point on what to do.

I read Apple&#39;s official [document][2] on interacting with C APIs in Swift but it has no examples in working with structs. 

Can anyone please help me out here? I&#39;d really appreciate it.

Thank you.


----------


**UPDATE:** Thanks to Martin I was able to get past the initial problem. But still Swift ain&#39;t making it easier for me. I&#39;m getting multiple new errors.

    func connectedToNetwork() -&gt; Bool {
        
        var zeroAddress = sockaddr_in(sin_len: 0, sin_family: 0, sin_port: 0, sin_addr: in_addr(s_addr: 0), sin_zero: (0, 0, 0, 0, 0, 0, 0, 0))
        zeroAddress.sin_len = UInt8(sizeofValue(zeroAddress))
        zeroAddress.sin_family = sa_family_t(AF_INET)
        
        var defaultRouteReachability: SCNetworkReachabilityRef = SCNetworkReachabilityCreateWithAddress(UnsafePointer&lt;Void&gt;, UnsafePointer&lt;zeroAddress&gt;) // &#39;zeroAddress&#39; is not a type
        var flags = SCNetworkReachabilityFlags()
        
        let didRetrieveFlags = SCNetworkReachabilityGetFlags(defaultRouteReachability, UnsafeMutablePointer&lt;flags&gt;) // &#39;flags&#39; is not a type
        defaultRouteReachability.dealloc(1) // &#39;SCNetworkReachabilityRef&#39; does not have a member named &#39;dealloc&#39;
        
        if didRetrieveFlags == false {
            return false
        }
        
        let isReachable: Bool = flags &amp; kSCNetworkFlagsReachable // Cannot invoke &#39;&amp;&#39; with an argument list of type &#39;(@lvalue UInt32, Int)&#39;
        let needsConnection: Bool = flags &amp; kSCNetworkFlagsConnectionRequired // Cannot invoke &#39;&amp;&#39; with an argument list of type &#39;(@lvalue UInt32, Int)&#39;
        
        return (isReachable &amp;&amp; !needsConnection) ? true : false
    }


----------


**EDIT 1:**  Okay I changed this line to this,

    var defaultRouteReachability: SCNetworkReachabilityRef = SCNetworkReachabilityCreateWithAddress(UnsafePointer&lt;Void&gt;(), &amp;zeroAddress)

The new error I&#39;m getting at this line is **&#39;UnsafePointer&lt;Void&gt;&#39; is not convertible to &#39;CFAllocator&#39;**. How to you pass `NULL` in Swift?

Also I changed this line and the error is gone now.

    let didRetrieveFlags = SCNetworkReachabilityGetFlags(defaultRouteReachability, &amp;flags)


----------


**EDIT 2:** I passed `nil` in this line after seeing [this][3] question. But that answer contradicts with the answer [here][4]. It says there is no equivalent to `NULL` in Swift.

    var defaultRouteReachability: SCNetworkReachabilityRef = SCNetworkReachabilityCreateWithAddress(nil, &amp;zeroAddress)

Anyway I get a new error saying **&#39;sockaddr_in&#39; is not identical to &#39;sockaddr&#39;** at the above line.


  [1]: http://www.chrisdanielson.com/2009/07/22/iphone-network-connectivity-test-example/#comments
  [2]: https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/BuildingCocoaApps/InteractingWithCAPIs.html#//apple_ref/doc/uid/TP40014216-CH8-XID_13
  [3]: https://stackoverflow.com/questions/24065774/calling-a-function-with-null-as-parameter
  [4]: https://stackoverflow.com/a/24043722/1077789

How to use SCNetworkReachability in Swift

I have been fooling around with some code and saw something that I don&#39;t understand the &quot;why&quot; of.

    int i = 6;
    int j;

    int *ptr = &amp;i;
    int *ptr1 = &amp;j

    j = i++;

    //now j == 6 and i == 7. Straightforward.

What if you put the operator on the left side of the equals sign?

    ++ptr = ptr1;

is equivalent to

    (ptr = ptr + 1) = ptr1; 

whereas

    ptr++ = ptr1;

is equivalent to

    ptr = ptr + 1 = ptr1;


The postfix runs a compilation error and I get it. You&#39;ve got a constant &quot;ptr + 1&quot; on the left side of an assignment operator. Fair enough. 

The prefix one compiles and WORKS in C++. Yes, I understand it&#39;s messy and you&#39;re dealing with unallocated memory, but it works and compiles. In C this does not compile, returning the same error as the postfix &quot;lvalue required as left operand of assignment&quot;. This happens no matter how it&#39;s written, expanded out with two &quot;=&quot; operators or with the &quot;++ptr&quot; syntax.

What is the difference between how C handles such an assignment and how C++ handles it?

The difference between C and C++ regarding the ++ operator

*Update 2017-05-17. I no longer work for the company where this question originated, and do not have access to Delphi XEx. While I was there, the problem was solved by migrating to mixed FPC+GCC (Pascal+C), with NEON intrinsics for some routines where it made a difference. (FPC+GCC is highly recommended also because it enables using standard tools, particularly Valgrind.) If someone can demonstrate, with credible examples, how they are actually able to produce optimized ARM code from Delphi XEx, I&#39;m happy to accept the answer.*

______


Embarcadero&#39;s Delphi compilers use an LLVM backend to produce native ARM code for Android devices. I have large amounts of Pascal code that I need to compile into Android applications and I would like to know how to make Delphi generate more efficient code. Right now, I&#39;m not even talking about advanced features like automatic SIMD optimizations, just about producing reasonable code. Surely there must be a way to pass parameters to the LLVM side, or somehow affect the result? Usually, any compiler will have many options to affect code compilation and optimization, but Delphi&#39;s ARM targets seem to be just &quot;optimization on/off&quot; and that&#39;s it.

LLVM is supposed to be capable of producing reasonably tight and sensible code, but it seems that Delphi is using its facilities in a weird way. Delphi wants to use the stack very heavily, and it generally only utilizes the processor&#39;s registers r0-r3 as temporary variables. Perhaps the craziest of all, it seems to be loading normal 32 bit integers as four 1-byte load operations. How to make Delphi produce better ARM code, and without the byte-by-byte hassle it is making for Android? 

At first I thought the byte-by-byte loading was for swapping byte order from big-endian, but that was not the case, it is really just loading a 32 bit number with 4 single-byte loads.*  It might be to load the full 32 bits without doing an unaligned word-sized memory load. (whether it SHOULD avoid that is another thing, which would hint to the whole thing being a compiler bug)*

Let&#39;s look at this simple function:

&lt;!-- language: lang-pascal --&gt;
    
    function ReadInteger(APInteger : PInteger) : Integer;
    begin
      Result := APInteger^;
    end;

Even with optimizations switched on, Delphi XE7 with update pack 1, as well as XE6, produce the following ARM assembly code for that function:

&lt;!-- language: lang-asm --&gt;
    
    Disassembly of section .text._ZN16Uarmcodetestform11ReadIntegerEPi:
    
    00000000 &lt;_ZN16Uarmcodetestform11ReadIntegerEPi&gt;:
       0:	b580      	push	{r7, lr}
       2:	466f      	mov	r7, sp
       4:	b083      	sub	sp, #12
       6:	9002      	str	r0, [sp, #8]
       8:	78c1      	ldrb	r1, [r0, #3]
       a:	7882      	ldrb	r2, [r0, #2]
       c:	ea42 2101 	orr.w	r1, r2, r1, lsl #8
      10:	7842      	ldrb	r2, [r0, #1]
      12:	7803      	ldrb	r3, [r0, #0]
      14:	ea43 2202 	orr.w	r2, r3, r2, lsl #8
      18:	ea42 4101 	orr.w	r1, r2, r1, lsl #16
      1c:	9101      	str	r1, [sp, #4]
      1e:	9000      	str	r0, [sp, #0]
      20:	4608      	mov	r0, r1
      22:	b003      	add	sp, #12
      24:	bd80      	pop	{r7, pc}


Just count the number of instructions and memory accesses Delphi needs for that. And constructing a 32 bit integer from 4 single-byte loads... If I change the function a little bit and use a var parameter instead of a pointer, it is slightly less convoluted:

&lt;!-- language: lang-asm --&gt;
    
    Disassembly of section .text._ZN16Uarmcodetestform14ReadIntegerVarERi:
    
    00000000 &lt;_ZN16Uarmcodetestform14ReadIntegerVarERi&gt;:
       0:	b580      	push	{r7, lr}
       2:	466f      	mov	r7, sp
       4:	b083      	sub	sp, #12
       6:	9002      	str	r0, [sp, #8]
       8:	6801      	ldr	r1, [r0, #0]
       a:	9101      	str	r1, [sp, #4]
       c:	9000      	str	r0, [sp, #0]
       e:	4608      	mov	r0, r1
      10:	b003      	add	sp, #12
      12:	bd80      	pop	{r7, pc}

I won&#39;t include the disassembly here, but for iOS, Delphi produces identical code for the pointer and var parameter versions, and they are almost but not exactly the same as the Android var parameter version. 
*Edit: to clarify, the byte-by-byte loading is only on Android. And only on Android, the pointer and var parameter versions differ from each other. On iOS both versions generate exactly the same code.*

For comparison, here&#39;s what FPC 2.7.1 (SVN trunk version from March 2014) thinks of the function with optimization level -O2. The pointer and var parameter versions are exactly the same.

&lt;!-- language: lang-asm --&gt;
    
    Disassembly of section .text.n_p$armcodetest_$$_readinteger$pinteger$$longint:

    00000000 &lt;P$ARMCODETEST_$$_READINTEGER$PINTEGER$$LONGINT&gt;:
    
       0:	6800      	ldr	r0, [r0, #0]
       2:	46f7      	mov	pc, lr

I also tested an equivalent C function with the C compiler that comes with the Android NDK.

&lt;!-- language: lang-c --&gt;

    int ReadInteger(int *APInteger)
    {
    	return *APInteger;
    }

And this compiles into essentially the same thing FPC made:

&lt;!-- language: lang-asm --&gt;
    
    Disassembly of section .text._Z11ReadIntegerPi:
    
    00000000 &lt;_Z11ReadIntegerPi&gt;:
       0:	6800      	ldr	r0, [r0, #0]
       2:	4770      	bx	lr

How to affect Delphi XEx code generation for Android/ARM targets?

My goal is:

 - Given a suspended thread in a Delphi-compiled 32 or 64-bit Windows program, to walk the stack (doable)
 - Given stack entries, to enumerate the local variables in each method and their values. That is, at the very least, find their address and type (integer32/64/signed/unsigned, string, float, record, class...) the combination of which can be used to find their value.

The first is fine and it&#39;s the second that this question is about. At a high level, **how do you enumerate local variables given a stack entry in Delphi?**


----------

At a low level, this is what I&#39;ve been investigating:

**RTTI:** does not list this kind of information about methods. This was not something I actually ever thought was a realistic option, but listing here anyway.

**Debug information:** Loading the debug info produced for a debug build.

 - Map files: even a detailed map file (a text-format file! Open one and have a look) does not contain local variable info. It&#39;s basically a list of addresses and source file line numbers. Great for address to file&amp;line correlation, e.g. the blue dots in the gutter; not great for more detailed information
 - Remote debugging information (RSM file) - [no known information][1] on its contents or format.
 - **TD32/TDS files:** my current line of research. They contain global and local symbols among a lot of other information.

The problems I&#39;m encountering here are:

 - There&#39;s no documentation of the TD32 file format (that I can find.)
 - Most of my knowledge of them comes from the Jedi JCL code using them (JclTD32.pas) and I&#39;m not sure how to use that code, or whether the structures there are extensive enough to show local vars. I&#39;m pretty certain it will handle global symbols, but I&#39;m very uncertain about local. There are a wide variety of constants defined and without documentation for the format, to read what they mean, I&#39;m left guessing. However, those constants and their names must come from somewhere.
 - [Source I can find using TDS info][2] does not load or handle local symbols.

If this is the right approach, then this question becomes &#39;Is there documentation for the TDS/TD32 file format, and are there any code samples that load local variables?&#39;

A code sample isn&#39;t essential but could be very useful, even if it&#39;s very minimal.


  [1]: https://stackoverflow.com/questions/10481027/remote-debug-symbol-file-format
  [2]: http://sourceforge.net/p/tds2dbg/wiki/Main_Page/

Content Type	Original Author	Original Content on Stackoverflow
Question	Xavier Dufaure de Citres	View Question on Stackoverflow
Solution 1 - Ios	Siana	View Answer on Stackoverflow

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