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  • Directly Jump to another C++ function

    - by maligree
    I'm porting a small academic OS from TriCore to ARM Cortex (Thumb-2 instruction set). For the scheduler to work, I sometimes need to JUMP directly to another function without modifying the stack nor the link register. On TriCore (or, rather, on tricore-g++), this wrapper template (for any three-argument-function) works: template< class A1, class A2, class A3 > inline void __attribute__((always_inline)) JUMP3( void (*func)( A1, A2, A3), A1 a1, A2 a2, A3 a3 ) { typedef void (* __attribute__((interrupt_handler)) Jump3)( A1, A2, A3); ( (Jump3)func )( a1, a2, a3 ); } //example for using the template: JUMP3( superDispatch, this, me, next ); This would generate the assembler instruction J (a.k.a. JUMP) instead of CALL, leaving the stack and CSAs unchanged when jumping to the (otherwise normal) C++ function superDispatch(SchedulerImplementation* obj, Task::Id from, Task::Id to). Now I need an equivalent behaviour on ARM Cortex (or, rather, for arm-none-linux-gnueabi-g++), i.e. generate a B (a.k.a. BRANCH) instruction instead of BLX (a.k.a. BRANCH with link and exchange). But there is no interrupt_handler attribute for arm-g++ and I could not find any equivalent attribute. So I tried to resort to asm volatile and writing the asm code directly: template< class A1, class A2, class A3 > inline void __attribute__((always_inline)) JUMP3( void (*func)( A1, A2, A3), A1 a1, A2 a2, A3 a3 ) { asm volatile ( "mov.w r0, %1;" "mov.w r1, %2;" "mov.w r2, %3;" "b %0;" : : "r"(func), "r"(a1), "r"(a2), "r"(a3) : "r0", "r1", "r2" ); } So far, so good, in my theory, at least. Thumb-2 requires function arguments to be passed in the registers, i.e. r0..r2 in this case, so it should work. But then the linker dies with undefined reference to `r6' on the closing bracket of the asm statement ... and I don't know what to make of it. OK, I'm not the expert in C++, and the asm syntax is not very straightforward... so has anybody got a hint for me? A hint to the correct __attribute__ for arm-g++ would be one way, a hint to fix the asm code would be another. Another way maybe would be to tell the compiler that a1..a3 should already be in the registers r0..r2 when the asm statement is entered (I looked into that a bit, but did not find any hint).

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  • javascript multidimensional array?

    - by megapool020
    Hi there, I hope I can make myself clear in English and in what I want to create. I first start with what I want. I want to make a IBANcalculator that can generate 1-n IBANnumbers and also validate a given IBANnumber. IBANnumbers are used in many countries for payment and the tool I want to make can be used to generate the numbers for testing purpose. On wikipedia (Dutch site) I found a list with countries and their way of defining the IBANnumber. What I want to do it to make a kind of an array that holds all the countries with their name, the code, there IBANlength, the bankingformat and the account format. The array needs to be used to: Generate a select list (for selecting a country) used to check part for generating numbers used to check part for validating number I don't know if an array is the best way, but that's so far the most knowledge I have. I allready made a table like this that holds the info (this table isn't used anyware, but it was a good way for me to show you what I have in mind about how the structure is): <table> <tr> <td>countryname</td> <td>country code</td> <td>valid IBAN length</td> <td>Bank/Branch Code (check1, bank, branch)</td> <td>Account Number (check2, number, check3)</td> <tr> <tr> <td>Andorra</td> <td>AD</td> <td>24</td> <td>0 4n 4n</td> <td>0 12 0 </td> <tr> <tr> <td>België</td> <td>BE</td> <td>16</td> <td>0 3n 0 </td> <td>0 7n 2n</td> <tr> <tr> <td>Bosnië-Herzegovina</td> <td>BA</td> <td>20</td> <td>0 3n 3n</td> <td>0 8n 2n</td> <tr> </table> and many more ;-) I hope someone can help me with this. Tnx in advance

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  • How to filter SVN changes in Hudson's POLL SCM?

    - by Koert
    We're using Hudson on an SVN repository that hosts a number of projects. One of these projects takes a long time to build, even if no files were changed. Right now Hudson's "Poll SVN" detects that the subversion repository has changed and will try to build the project, even if that change was in a different project. Is there a way to set up "Poll SCM" to only respond to changes in a certain branch?

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  • C# Dictionary<> and mutable keys

    - by Pierreten
    I was told that one of the many reasons strings were made immutable in the C# spec was to avoid the issue of HashTables having keys changed when references to the string keys altered their content. The Dictionary< type allows reference types to be used as a key. How does the dictionary avoid the issue of altered keys that lead to "misplaced" values? Is there a memberwise clone made of an object when used as a key?

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  • Merging all changesets associated with a WorkItem in Team Foundation Server

    - by Rowland Shaw
    We're trailing the use of the built in bug tracking, and have written some integration into our helpdesk software that allows for escalation via workitems. One thing I haven't found out how to do, is to merge all changes associated with a work item (say to go from dev branch to main) - I appreciate you can double click on a changeset in the merge dialog to view if it is associated with a workitem, and also that I can select individual changesets, and groups of adjacent changesets; but there doesn't appear to be any way to merge changes by workitem?

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  • Is it appropriate to use non-ASCII (natural-language) XML tags?

    - by Vladimir Alexiev
    Is it appropriate to use XML tags (element names) written in non-ASCII natural languages? The XML spec allows it (see Names and Exceptions), but I couldn't find any best practices about this at W3C and related pages. What I'm looking for is practical advice regarding which tools support this, whether important XML-related technologies such as XSLT and XForms may have problems with it, etc.

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  • How to pipe two CORE::system commands in a cross-platform way

    - by Pedro Silva
    I'm writing a System::Wrapper module to abstract away from CORE::system and the qx operator. I have a serial method that attempts to connect command1's output to command2's input. I've made some progress using named pipes, but POSIX::mkfifo is not cross-platform. Here's part of what I have so far (the run method at the bottom basically calls system): package main; my $obj1 = System::Wrapper->new( interpreter => 'perl', arguments => [-pe => q{''}], input => ['input.txt'], description => 'Concatenate input.txt to STDOUT', ); my $obj2 = System::Wrapper->new( interpreter => 'perl', arguments => [-pe => q{'$_ = reverse $_}'}], description => 'Reverse lines of input input', output => { '>' => 'output' }, ); $obj1->serial( $obj2 ); package System::Wrapper; #... sub serial { my ($self, @commands) = @_; eval { require POSIX; POSIX->import(); require threads; }; my $tmp_dir = File::Spec->tmpdir(); my $last = $self; my @threads; push @commands, $self; for my $command (@commands) { croak sprintf "%s::serial: type of args to serial must be '%s', not '%s'", ref $self, ref $self, ref $command || $command unless ref $command eq ref $self; my $named_pipe = File::Spec->catfile( $tmp_dir, int \$command ); POSIX::mkfifo( $named_pipe, 0777 ) or croak sprintf "%s::serial: couldn't create named pipe %s: %s", ref $self, $named_pipe, $!; $last->output( { '>' => $named_pipe } ); $command->input( $named_pipe ); push @threads, threads->new( sub{ $last->run } ); $last = $command; } $_->join for @threads; } #... My specific questions: Is there an alternative to POSIX::mkfifo that is cross-platform? Win32 named pipes don't work, as you can't open those as regular files, neither do sockets, for the same reasons. The above doesn't quite work; the two threads get spawned correctly, but nothing flows across the pipe. I suppose that might have something to do with pipe deadlocking or output buffering. What throws me off is that when I run those two commands in the actual shell, everything works as expected.

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  • MS Access Import from Text File problems

    - by Gavin O'Brien
    I'm trying to import a text file into an access database. It's not one I've written myself but the spec for the delimited text file is set up properly and the file imports properly using the wizard. When I try to use the import functions of the app itself, the ImportError table tells "Field Truncation" for one of the fields. Any help would be appreciated.

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  • C++ thread to seperate process

    - by silverbandit91
    Is there any way i can have a thread branch off into it's own independent process? I know there's the CreateProcess function but as far as I can tell, you can only run external applications with it. Is what I'm asking for at all possible?

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  • Clear Graphics Object to Black or other RGB

    - by Jimmy
    I am a rank beginner in C#. I am currently using this code: objGraphics.Clear(SystemColors.Control); What I want to do is Clear this object to black (or some other RGB color), and I'm stumped as to how to replace the SystemColors.Control with, preferably, an RGB color spec. I'd probably want to clear to black most of the time. Any help will be much appreciated!

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  • Undefined namespace prefix in Nokogiri and XPath

    - by ???? ???????
    I am trying to parse Youtube Gdata to see if video with given id exists. But there isn't normal tag but with namespace. On the link http://gdata.youtube.com/feeds/api/videos?q=KgfdlZuVz7I there is tag: <openSearch:totalResults>1</openSearch:totalResults> There is namespace openSearch: xmlns:openSearch='http://a9.com/-/spec/opensearchrss/1.0/' but I dont know how to deal with it in Nokogiri and Ruby. Here is part of code: xmlfeed = Nokogiri::HTML(open("http://gdata.youtube.com/feeds/api/videos?q=#{video_id}")) xmlfeed.at_xpath("openSearch:totalResults") It gives error: Undefined namespace prefix: openSearch:totalResults

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  • Resizing of AS-based Flash app from FireFox vs. IE...

    - by bferster
    I have put in some controls to allow users to resize my Flash app via Javascript: document.getElementById("flashApp").height*=1.25; document.getElementById("flashApp").width*=1.25; This works great in IE/Safari, but is ignored in Firefox. I know it's talking the the flash app and gets and sets the height/width vars ok, but the same code run in FireFox ignores the scaling. (It's not the DOC spec issue) Any thoughts? Bill

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  • Ordered hash in JavaScript

    - by hekevintran
    JavaScript objects have no order stored for properties (according to the spec). Firefox seems preserve the order of definition of properties when using a for...in loop. Is this behaviour something that I can rely on? If not is there a piece of JavaScript code somewhere that implements an ordered hash type?

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  • Change cursor style in firefox input file tag

    - by JohnJ
    I have been trying to change the cursor style to look like a pointer rather than an I beam thing, but it looks like FF does not respect the cursor spec in an input file field. For example, I have made this small fiddle: http://jsfiddle.net/jDZtn/4/ where Id like the cursor to look like a pointer rather than an Ibeam when the user hovers over it. My end plan is to introduce opacity==0 and use a clickable button over it. I am not sure if this behaviour is a bug or not.

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  • Getting a list of all children of a given commit

    - by intuited
    I'd like to run git filter-branch on all children of a given commit. This doesn't seem to be an easy task, since there doesn't appear to be a way to tell git rev-list to only return children of a particular commit. Using the .. syntax won't work because it will also include the parent commits of any merge within that range. Am I missing something here?

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  • Remove Item From Object SubList (LINQ)

    - by X3074861X
    I have an object that looks like this : public class Consortium { public string Id { get; set; } [JsonConverter(typeof(EnumDescriptionConverter))] public SourceType Type { get; set; } public List<UserLibrary> Branches { get; set; } } Each Consortium has a list of UserLibrary's associated with it, and that class looks like this : public class UserLibrary { public string LibraryId { get; set; } public string RetailerId {get; set;} public string UserId { get; set; } public string Name { get; set; } public DateTime CreatedAt { get; set; } } I have a method which will allow the user to remove a library from one of their consortium (note: There may be many branches associated to the consortium). However, I'm only being supplied a LibraryId, so I'm forced to traverse their list of Consortium, find which one contains the given id, then iterate over the branches and remove the one that matches the id. Here is how I'm currently accomplishing this : // Get the current list of consortiums var user = _mediator.Send(new GetUserProfileCommand { UserProfileId = _principle.UserProfileId }); var userConsortia = user.SavedConsortia; // the consortium to remove the library from var branchToRemove = _libraryService.GetLibrary(id); var consortRemove = new UserConsortium(); foreach (var userConsortium in userConsortia) { if (userConsortium.Branches.FirstOrDefault(c => string.Equals(c.LibraryId, id, StringComparison.OrdinalIgnoreCase)) != null) { consortRemove = userConsortium; } } // if the consortium id is null, something is f* if (consortRemove.Id == null) { return new JsonDotNetResult(HttpStatusCode.BadRequest); } // first remove the consortia userConsortia.Remove(consortRemove); // remove the branch from the consortium consortRemove.Branches.RemoveAll(ul => string.Equals(ul.LibraryId, id, StringComparison.OrdinalIgnoreCase)); // add it back in without the branch userConsortia.Add(consortRemove); Question : Is there a LINQ expression I'm missing here that can help me consolidate this logic, or is there a better way of doing this?

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  • Subversion: Oops! Any way to move / to /trunk?

    - by Metaphile
    I made the mistake of creating a Subversion repository without the usual trunk, branches, and tags directories. That is, the root directory of the project maps to the root directory of the repository. Now I want to create a feature branch, but there's no good place to put it. What I'd like to do is move / to /trunk, preserving its properties and history. Am I out of luck?

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  • Floating point arithmetics restricted to integers

    - by user396672
    I use doubles for a uniform implementation of some arithmetic calculations. These calculations may be actually applied to integers too, but there are no C++-like templates in Java and I don't want to duplicate the implementation code, so I simply use "double" version for ints. Does JVM spec guarantees the correctness of integer operations such a <=,=, +, -, *, and / (in case of remainder==0) when the operations are emulated as corresponding floating point ops? (Any integer, of course, has reasonable size to be represented in double's mantissa)

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  • quoting HTML attribute values

    - by Flavius
    Hi I know the spec allows both ' and " as delimiters for attribute values, and I also know it's a good practice to always quote. However I consider " being the cleaner way, maybe it's just me having grown up with C and C++' syntax. What is the cleanest way of quoting attribute values and why? Please no subjective answers.

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