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  • Deciphering a queer compiler warning about unsigned decimal constant

    - by Artagnon
    This large application has a memory pool library which uses a treap internally to store nodes of memory. The treap is implemented using cpp macros, and the complete file trp.h can be found here. I get the following compiler warning when I attempt to compile the application: warning: this decimal constant is unsigned only in ISO C90 By deleting portions of the macro code and using trial-and-error, I finally found the culprit: #define trp_prio_get(a_type, a_field, a_node) \ (2654435761*(uint32_t)(uintptr_t)(a_node)) I'm not sure what that strange number is doing there, but I assume it's there for a good reason, so I just want to leave it alone. I do want to fix the warning though- any idea why the compiler's saying that it's unsigned only in ISO C90? EDIT: I'm using gcc-4.1

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  • Require Integer Value not Memory Address whilst avoiding Invalid receiver type compiler warning

    - by Dave Anderson
    I have the following code; int days = [[SettingsUtils daysToRetainHistory] intValue]; [retainHistory setText:[NSString stringWithFormat:@"Days to retain History: %d", days]]; [daysToRetainHistory setValue:days animated:NO]; where [SettingsUtils daysToRetainHistory] is as follows; + (int) daysToRetainHistory { return (int)[[NSUserDefaults standardUserDefaults] objectForKey:@"CaseBaseDaysToRetainHistory"]; } I get the compiler warning Invalid receiver type 'int' because I call intValue on an int but unless I do this I can't seem to get the integer value out and always end up with the memory address i.e. 98765432 instead of 9 which ruins the UILabel display [retainHistory] and the UISlider [daysToRetainHistory] value. How do I avoid the compiler warning and still get my integer value in the label and the necessary float value for setting the UISlider value?

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  • Verifying compiler optimizations in gcc/g++ by analyzing assembly listings

    - by Victor Liu
    I just asked a question related to how the compiler optimizes certain C++ code, and I was looking around SO for any questions about how to verify that the compiler has performed certain optimizations. I was trying to look at the assembly listing generated with g++ (g++ -c -g -O2 -Wa,-ahl=file.s file.c) to possibly see what is going on under the hood, but the output is too cryptic to me. What techniques do people use to tackle this problem, and are there any good references on how to interpret the assembly listings of optimized code or articles specific to the GCC toolchain that talk about this problem?

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  • Can C/C++ compiler report struct member offset

    - by Chen Jun
    Hello, everyone. I'd like to ask, can compiler(e.g. Visual C++) generate a report(.txt) telling struct member offset for a struct/all structs? If so, it helps debugging quite a lot. For example, when you read disassembler code in the debugger, it can be easier to associate an offset value to a struct member. Also, it is better to have compiler report offset of each local variable on a function stack frame(e.g. the offset relative to ebp on an X86 machine). Thank you in advance.

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  • Compiler reordering around mutex boundaries?

    - by shojtsy
    Suppose I have my own non-inline functions LockMutex and UnlockMutex, which are using some proper mutex - such as boost - inside. How will the compiler know not to reorder other operations with regard to calls to the LockMutex and UnlockMutex? It can not possibly know how will I implement these functions in some other compilation unit. void SomeClass::store(int i) { LockMutex(_m); _field = i; // could the compiler move this around? UnlockMutex(_m); } ps: One is supposed to use instances of classes for holding locks to guarantee unlocking. I have left this out to simplify the example.

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  • CookieContainer bug?

    - by Salar
    I'm confused how CookieContainer handles domain, so I create this test. This test shows cookieContainer doesn't return any cookie for "site.com" but according to RFC it should return at least 2 cookies. Isn't it a bug? How make it to work? Here is a discussion about this bug: http://social.msdn.microsoft.com/Forums/en-US/ncl/thread/c4edc965-2dc2-4724-8f08-68815cf1dce6 <%@ Page Language="C#" %> <%@ Import Namespace="System.Net" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <script runat="server"> CookieContainer getContainer() { CookieContainer result = new CookieContainer(); Uri uri = new Uri("http://sub.site.com"); string cookieH = @"Test1=val; domain=sub.site.com; path=/"; result.SetCookies(uri, cookieH); cookieH = @"Test2=val; domain=.site.com; path=/"; result.SetCookies(uri, cookieH); cookieH = @"Test3=val; domain=site.com; path=/"; result.SetCookies(uri, cookieH); return result; } void Test() { CookieContainer cookie = getContainer(); lblResult.Text += "<br>Total cookies count: " + cookie.Count + " &nbsp;&nbsp; expected: 3"; Uri uri = new Uri("http://sub.site.com"); CookieCollection coll = cookie.GetCookies(uri); lblResult.Text += "<br>For " + uri + " Cookie count: " + coll.Count + " &nbsp;&nbsp; expected: 2"; uri = new Uri("http://other.site.com"); coll = cookie.GetCookies(uri); lblResult.Text += "<br>For " + uri + " Cookie count: " + coll.Count + " &nbsp;&nbsp; expected: 2"; uri = new Uri("http://site.com"); coll = cookie.GetCookies(uri); lblResult.Text += "<br>For " + uri + " Cookie count: " + coll.Count + " &nbsp;&nbsp; expected: 2"; } protected void Page_Load(object sender, EventArgs e) { Test(); } </script> <html xmlns="http://www.w3.org/1999/xhtml"> <head runat="server"> <title>CookieContainer Test Page</title> </head> <body> <form id="frmTest" runat="server"> <asp:Label ID="lblResult" EnableViewState="false" runat="server"></asp:Label> </form> </body> </html>

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  • JSF - 2 a4j:actionParam in one commandlink bug

    - by Yurish
    Hi! I have such structure in my jsp: <h:commandLink action=#{docbean.save}> <a4j:actionParam value="bill_all" assignTo="#{billdoc.billType}"/> <a4j:actionParam value="bill_document" assignTo="#{docbean.doctype}"/> </h:commandLink> While debugging i saw, that billdoc.billtype and docbean.doctype have the same values: "bill_document". Is it bug? If not, then how can i put value to my managed-bean?

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  • Possible compiler bug in MSVC12 (VS2013) with designated initializer

    - by diapir
    Using VS2013 Update 2, I've stumbled on some strange error message : // test.c int main(void) { struct foo { int i; float f; }; struct bar { unsigned u; struct foo foo; double d; }; struct foo some_foo = { .i = 1, .f = 2.0 }; struct bar some_bar = { .u = 3, // error C2440 : 'initializing' : cannot convert from 'foo' to 'int' .foo = some_foo, .d = 4.0 }; // Works fine some_bar.foo = some_foo; return 0; } Both GCC and Clang accept it. Am I missing something or does this piece of code exposes a compiler bug ? EDIT : Duplicate: Initializing struct within another struct using designated initializer causes compile error in Visual Studio 2013

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  • Does PrinterSettings.GetHdevmode() have a bug?

    - by Brandi
    I would like to be able to change the printer properties without bringing up the printer properties window... Using the DocumentProperties (imported from winspool.drv) function has so far failed, because while it is easy to suppress the dialog from showing up, it seems that the value returned by PrinterSettings.GetHdevmode() is not reflecting the PrinterSettings that is calling it, but instead the value from the previous printer properties returning OK. For example, this gives me the previous (wrong) values from the last call to the properties, instead of the values it should have from the PrinterSettings object: IntPtr hdevmode = PrinterSettings.GetHdevmode(PrinterSettings.DefaultPageSettings); PrinterSettings.SetHdevmode(hdevmode); PrinterSettings.DefaultPageSettings.SetHdevmode(hdevmode); So does GetHdevmode have a bug or is this what its supposed to do? Is there a C# work around for this or does anyone even have any information about it? I have been hard pressed even to find info on the topic. Thanks in advance for any insight.

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  • IE7 CSS bug aligning <img> with text in a <ul>

    - by Artem Russakovskii
    I've been banging my ahead on this IE7 bug for the last few days and it's time to resort to the mind of the crowd. I have the following HTML and CSS: http://beerpla.net/for_www/ie7_test/test.html The goal is to have a <ul>, with each <li> containing a small icon and some text. Multiline text would be aligned to itself and not wrap under the image. I've tried using float:left on the image and a bunch of other things, and finally I thought the position:absolute would work for sure but in IE7 I consistently see the text pop off to the next line and get misaligned with the image: This is what I expect it to look like: I even tried to make the div display:inline which kind of worked but then started wrapping under the image for long lines, so it was no good. zoom:1 also produced a similar effect. I'm at a loss at the moment. This code works fine in all other browsers. IE7 is a special, very special child. Any ideas? Thank you. Edit: If you have IE8, you can emulate IE7 by pressing F12 and then Alt-7.

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  • System.Dynamic bug?

    - by ControlFlow
    While I playing with the C# 4.0 dynamic, I found strange things happening with the code like this: using System.Dynamic; sealed class Foo : DynamicObject { public override bool TryInvoke( InvokeBinder binder, object[] args, out object result) { result = new object(); return true; } static void Main() { dynamic foo = new Foo(); var t1 = foo(0); var t2 = foo(0); var t3 = foo(0); var t4 = foo(0); var t5 = foo(0); } } Ok, it works but... take a look at IntelliTrace window: So every invokation (and other operations too on dynamic object) causes throwing and catching strange exceptions twice! I understand, that sometimes exceptions mechanism may be used for optimizations, for example first call to dynamic may be performed to some stub delegate, that simply throws exception - this may be like a signal to dynamic binder to resolve an correct member and re-point delegate. Next call to the same delegate will be performed without any checks. But... behavior of the code above looks very strange. Maybe throwing and catching exceptions twice per any operation on DynamicObject - is a bug?

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  • IE7 relative/absolute positioning bug with dynamically modified page content

    - by Matthias Hryniszak
    Hi, I was wondering if there's anyone having an idea how to tackle with the following problem in IE7: <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>IE7 absolute positioning bug</title> <style type="text/css"> #panel { position: relative; border: solid 1px black; } #spacer { height: 100px; } #footer { position: absolute; bottom: 0px; } </style> <script type="text/javascript"> function toggle() { var spacer = document.getElementById("spacer"); var style = "block"; if (spacer.style.display == "block" || spacer.style.display == "") { style = "none"; } spacer.style.display = style; } </script> </head> <body> <div id="panel"> <button onclick="toggle();">Click me</button> <br /><br /><br /> <div id="spacer"></div> <div id="footer">This is some footer</div> </div> </body> </html> When you run this in IE7 you'll see that the "footer" element stays after modifying the CSS for "panel". The same example tested in IE8, FF and Chrome behaves exactly as expected. I've already tried updating the element's class but this does not work if the browser's window has been opened maximized and no further size changes were made to the window (which is about 90% of the use cases we have for our product.... :( ) I'm stuck with a CSS-based solution however I think that I can make an exception in this case if it can easily be made IE7-specific (which means that other browsers will behave in a standard way with this). Please help!

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  • .net List<string>.Remove bug Should I submit a MS Connect bug report on this?

    - by Dean Lunz
    So I was beating my head against a wall for a while before it dawned on me. I have some code that saves a list of names into a text file ala ... System.IO.File.WriteAllLines(dlg.FileName, this.characterNameMasterList.Distinct().ToArray()); The character names can contain special characters. These names come from the wow armory at www.wowarmory.com There are about 26000 names or so saved in the .txt file. The names get saved to the .txt file just fine. I wrote another application that reads these names from that .txt file using this code // download the names from the db var webNames = this.DownloadNames("character"); // filter names and get ones that need to be added to the db var localNames = new List<string>(System.IO.File.ReadAllLines(dlg.FileName)); foreach (var name in webNames) { if (localNames.Contains(name.Trim())) localNames.Remove(name); } return localNames; ... the code downloads a list of names from my website that are already in the db. Then reads the local .txt file and singles out every name that is not yet in the db so it can later add it. The names that get read from the .txt file also get read just fine with no problems. The problem comes in when removing names from the localNames list. localNames is a List type. As soon as localNames.Remove(name) gets called any names in the list that had special characters in them would get corrupted and be converted into ? characters. See for screen cap http://yfrog.com/12badcharsp So i tried doing it another way using ... // download the names from web that are already in the db var webNames = this.DownloadNames("character"); // filter names and get ones that need to be added to the db var localNames = new List<string>(System.IO.File.ReadAllLines(dlg.FileName)); int index = 0; while (index < webNames.Count) { var name = webNames[index++]; var pos = localNames.IndexOf(name.Trim()); if (pos != -1) localNames.RemoveAt(pos); } return localNames; .. But using localNames.RemoveAt also corrupts the items in the list converting special characters into ?. So is this a known bug with the List.remove methods? Does anyone know? Has anyone else had this problem? I also used .NET Reflector to disassemble/inspect the list.remove and list.RemoveAt code and it appear to be calling some external Copy function. Aside from the fact that this is prob not the best way to get a unique list of items from 2 lists am I missing something or should be aware of when using the List.Remove methods ? I am running windows 7 vs2010 and my app is set for .net 4 (no client profile )

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  • How to see the code generated by the compiler

    - by atch
    Guys in one of excersises (ch.5,e.8) from TC++PL Bjarne asks to do following: '"Run some tests to see if your compiler really generates equivalent code for iteration using pointers and iteration using indexing. If different degrees of optimization can be requested, see if and how that affects the quality of the generated code"' Any idea how to eat it and with what? Thanks in advice.

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  • IAR MSP430 compiler internal error while compiling

    - by michael
    IAR C/C++ Compiler for MSP430 5.10.1 [Evaluation] (5.10.1.20144) I get an illegal state internal error when attempting to compile the FreeRTOS 5.4 Task.c file (everything else compiles fine) Internal Error: [CoreUtil/General]: Illegal state The kick start version of IAR (MSP430 version) works fine. Any thoughts?

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  • Get compiler generated delegate for an event

    - by Sandor Davidhazi
    I need to know what handlers are subsribed to the CollectionChanged event of the ObservableCollection class. The only solution I found would be to use Delegate.GetInvocationList() on the delegate of the event. The problem is, I can't get Reflection to find the compiler generated delegate. AFAIK the delegate has the same name as the event. I used the following piece of code: PropertyInfo notifyCollectionChangedDelegate = collection.GetType().GetProperty("CollectionChanged", BindingFlags.Instance | BindingFlags.Static | BindingFlags.NonPublic | BindingFlags.FlattenHierarchy);

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  • STM32 Compiler/Debugger Chain?

    - by Nate
    I'm starting a project with a STMicro STM32. I've done the Google searches, looking for solid compiler/debugger chains but would prefer answers with success stories. Open Source Compilers/Linkers would be ideal, I just don't know if their STM32 toolchains are stable yet. (Both C, C++ compilers are acceptable). -- So commercial options are acceptable as well. Do any of you have useful suggestions?

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  • Learning to write a compiler

    - by Anton
    Preferred Languages : C/C++, Java, and Ruby I am looking for some helpful books/tutorials on how to write your own compiler simply for educational purposes. I am most familiar with C/C++, Java, and Ruby so I prefer resources that involve one of those three, but any good resource is acceptable.

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  • How to manually throw a compiler error in GCC and Xcode

    - by coneybeare
    In xcode, while compiling apps with gcc, I want to throw compilation time errors if things like NSZombieEnabled is on for a distribution release, thus ensuring that compilation will fail and I won't accidentally do something stupid. I did some googling, but could not figure out how to cause the compiler to bail if a certain condition is met. Surely it must be easy, am I just not finding it?

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  • C precision of double: compiler dependent?

    - by yCalleecharan
    Hi,on my 32-bit machine (with an Intel T7700 duo core), I have 15 precision digits for both double and long double types for the C language. I compared the parameters LDBL_DIG for long doubles and DBL_DIG for doubles and they are both 15. I got these answers using MVS2008. I was wondering if these results can be compiler dependent or do they just depend on my processor? Thanks a lot...

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  • Unique_ptr compiler errors

    - by Godric Seer
    I am designing and entity-component system for a project, and C++ memory management is giving me a few issues. I just want to make sure my design is legitimate. So to start I have an Entity class which stores a vector of Components: class Entity { private: std::vector<std::unique_ptr<Component> > components; public: Entity() { }; void AddComponent(Component* component) { this -> components.push_back(std::unique_ptr<Component>(component)); } ~Entity(); }; Which if I am not mistaken means that when the destructor is called (even the default, compiler created one), the destructor for the Entity, will call ~components, which will call ~std::unique_ptr for each element in the vector, and lead to the destruction of each Component, which is what I want. The component class has virtual methods, but the important part is its constructor: Component::Component(Entity parent) { parent.addComponent(this) // I am not sure if this would work like I expect // Other things here } As long as passing this to the method works, this also does what I want. My confusion is in the factory. What I want to do is something along the lines of: std::shared_ptr<Entity> createEntity() { std::shared_ptr<Entity> entityPtr(new Entity()); new Component(*parent); // Initialize more, and other types of Components return entityPtr; } Now, I believe that this setup will leave the ownership of the Component in the hands of its Parent Entity, which is what I want. First a small question, do I need to pass the entity into the Component constructor by reference or pointer or something? If I understand C++, it would pass by value, which means it gets copied, and the copied entity would die at the end of the constructor. The second, and main question is that code based on this sample will not compile. The complete error is too large to print here, however I think I know somewhat of what is going on. The compiler's error says I can't delete an incomplete type. My Component class has a purely virtual destructor with an implementation: inline Component::~Component() { }; at the end of the header. However since the whole point is that Component is actually an interface. I know from here that a complete type is required for unique_ptr destruction. The question is, how do I work around this? For reference I am using gcc 4.4.6.

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  • Is ToString() optimized by compiler?

    - by TheVillageIdiot
    Suppose I've following Code: Console.WriteLine("Value1: " + SomeEnum.Value1.ToString() + "\r\nValue2: " + SomeOtherEnum.Value2.ToString()); Will Compiler Optimize this to: Console.WriteLine("Value1: " + SomeEnum.Value1 + "\r\nValue2: " + SomeOtherEnum.Value2); I've checked it with IL Disassembler and there are calls to IL_005a: callvirt instance string [mscorlib]System.Object::ToString() I don't know if JIT optimizes this.

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