BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  OOP and large EXEs Goto page 1, 2, 3, 4  Next          BorlandTalk.com Forum Index -> Delphi Non-Technical View previous topic :: View next topic   Author Message Jud McCranie Guest Posted: Tue Sep 16, 2003 3:39 am    Post subject: OOP and large EXEs Is is correct that with an OOP language (such as Delphi or C++), the linker can't remove the unused code the way the linker with Turbo Pascal could? Can you give me a reference? Thanks very much. Back to top herman Guest Posted: Tue Sep 16, 2003 4:36 am    Post subject: Re: OOP and large EXEs "Jud McCranie" <judmccr (AT) bellsouth (DOT) net> дÈëÏûÏ¢ÐÂÎÅ :3f6685ca$1 (AT) newsgroups (DOT) borland.com... Quote: Is is correct that with an OOP language (such as Delphi or C++), the linker can't remove the unused code the way the linker with Turbo Pascal could? Can you give me a reference? Thanks very much. the linker can remove unuesed global variables/procedures, but without class members. Back to top Jud McCranie Guest Posted: Tue Sep 16, 2003 4:43 am    Post subject: Re: OOP and large EXEs Quote: the linker can remove unuesed global variables/procedures, but without class members. Thanks. Can you clarify what you mean by "without class members" foe me? Can/does it remove unused methods of an object? Back to top Cruxy Guest Posted: Tue Sep 16, 2003 6:21 am    Post subject: Re: OOP and large EXEs Quote: Thanks. Can you clarify what you mean by "without class members" foe me? Can/does it remove unused methods of an object? hi, No. A object is also known as class and all (unused) methods in an object are not removed on optimization. greetz Back to top Dave Nottage (TeamB) Guest Posted: Tue Sep 16, 2003 6:33 am    Post subject: Re: OOP and large EXEs Cruxy wrote: Quote: A object is also known as class.. An object is not a class. An object is an instance of a class. Quote: and all (unused) methods in an object are not removed on optimization. All unused non-virtual methods of a class are removed by the linker. -- Dave Nottage (TeamB) Back to top Dzmitry Piatrushenia Guest Posted: Tue Sep 16, 2003 7:07 am    Post subject: Re: OOP and large EXEs Hello Jud McCranie, Quote: Is is correct that with an OOP language (such as Delphi or C++), the linker can't remove the unused code the way the linker with Turbo Pascal could? The linker can remove unused code if it is REALLY unused. For example, code in the initialization section of the unit isn't explicitly used, but it can't be removed. So if you simply add a unit into the USES-clause and don't use any of its code, your EXE file will grow anyway. -- Dzmitry Piatrushenia ICQ #48665143 Back to top Jeremy Collins Guest Posted: Tue Sep 16, 2003 7:27 am    Post subject: Re: OOP and large EXEs Cruxy wrote: Quote: No. A object is also known as class and all (unused) methods in an object are not removed on optimization. An object is an *instance* of a class - they are different things. -- jc Remove the -not from email Back to top Cruxy Guest Posted: Tue Sep 16, 2003 10:44 am    Post subject: Re: OOP and large EXEs Quote: An object is not a class. An object is an instance of a class. Thanks, now I also know the exact explanation of classes and objects ! Quote: All unused non-virtual methods of a class are removed by the linker. Also if these are public/published members of a class? (cause there might be some problems on passing references from objects) Back to top Kristofer Skaug Guest Posted: Tue Sep 16, 2003 11:13 am    Post subject: Re: OOP and large EXEs "Jud McCranie" wrote Quote: Can/does it remove unused methods of an object? At the very least, the compiler will give a hint about unused *private* methods of a class. Kristofer Back to top Andrea Raimondi Guest Posted: Tue Sep 16, 2003 12:10 pm    Post subject: Re: OOP and large EXEs Dzmitry Piatrushenia wrote: Quote: The linker can remove unused code if it is REALLY unused. Better to say that the linker can remove all unused code that it can delete *safely*. Andrew Back to top Wayne Niddery [TeamB] Guest Posted: Tue Sep 16, 2003 2:56 pm    Post subject: Re: OOP and large EXEs Cruxy wrote: Quote: All unused non-virtual methods of a class are removed by the linker. Also if these are public/published members of a class? (cause there might be some problems on passing references from objects) Within an .exe, yes - the linker can determine whether these are referred to anywhere. If compiling a package, then no because the linker cannot predict whether these will be referred to by .exes using the package. That's why VCLxx.BPL is so large compared to the size of an exe compiled without packages. -- Wayne Niddery - Logic Fundamentals, Inc. (www.logicfundamentals.com) RADBooks: http://www.logicfundamentals.com/RADBooks.html "It is error alone which needs the support of government. Truth can stand by itself." - Thomas Jefferson Back to top Jud McCranie Guest Posted: Tue Sep 16, 2003 4:14 pm    Post subject: Re: OOP and large EXEs Quote: Within an .exe, yes - the linker can determine whether these are referred to anywhere. If compiling a package, then no because the linker cannot predict whether these will be referred to by .exes using the package. That's why VCLxx.BPL is so large compared to the size of an exe compiled without packages. Thanks. As a test, I added an unused proc to a form of mine. If I put the declaration in the private section, it did not increase the size of the EXE. But if I put it above the privae section under class, it DID increase the EXE, even though it is never used. Why is that? Back to top Jud McCranie Guest Posted: Tue Sep 16, 2003 4:54 pm    Post subject: Re: OOP and large EXEs Thanks for the replies everyone, I'm still trying to understand it. I did my test of adding an unused proc, and it did increase the size of the EXE if I put it under Class. Also, http://www.clarionmag.com/col/97-07-whyoop.html says "With our smart linker technology, we do not copy objects or classes as with other languages. We avoid linking in methods that are not used. This allows you to use pieces of a complex object. Other languages suffer horrible bouts of code bloat." Doesn't that imply that unused methods do get linked in with most OOP languages? Can someone explain? Back to top TObject Guest Posted: Tue Sep 16, 2003 5:02 pm    Post subject: Re: OOP and large EXEs Quote: An object is not a class. An object is an instance of a class. Instantiated object is an instance of a class. ;) I guess different people call different things different names... Back to top Jud McCranie Guest Posted: Tue Sep 16, 2003 5:13 pm    Post subject: Re: OOP and large EXEs Quote: All unused non-virtual methods of a class are removed by the linker. What about unused vitrual methods? Back to top Display posts from previous: All Posts1 Day7 Days2 Weeks1 Month3 Months6 Months1 Year Oldest FirstNewest First         BorlandTalk.com Forum Index -> Delphi Non-Technical All times are GMT Goto page 1, 2, 3, 4  Next Page 1 of 4   Jump to: Select a forum C++ Builder Newsgroups----------------C++ BuilderC++ Builder (ActiveX)C++ Builder (Announcements)C++ Builder (Command Line Tools)C++ Builder DatabasesC++ Builder Databases (ADO)C++ Builder Databases (Desktop)C++ Builder Databases (InterBase Express)C++ Builder Databases (Multi-Tier)C++ Builder Databases (SQL Servers)C++ Builder (Graphics)C++ Builder (IDE)C++ Builder (Internet)C++ Builder (Internet Socket)C++ Builder (Internet Web)C++ Builder (Jobs)C++ Builder (Language)C++ Builder (Language C++)C++ Builder (Compatibility with MFC)C++ Builder (Native API)C++ Builder (Non-Technical)C++ Builder (Students)C++ Builder (Third Party Tools)C++ Builder (Upgrade)C++ Builder (VCL)C++ Builder (VCL Components Usage)C++ Builder (VCL Components Development)C++ Builder (VCL Usage)C++ Builder (WinAPI)C++ Builder Installation Delphi Newsgroups----------------Delphi (General)Delphi ActiveX Controls UsageDelphi ActiveX Controls DevelopmentDelphi As400Delphi DatabasesDelphi Databases (ADO)Delphi Databases (dbExpress)Delphi Databases (Desktop)Delphi Databases (InterBase Express)Delphi Databases (Multi-Tier)Delphi Databases (SQL Servers)Delphi DeploymentDelphi GraphicsDelphi IDEDelphi InternationalizationDelphi InternetDelphi Internet Isapi-WebBrokerDelphi Internet WebSnapDelphi Internet WinsockDelphi JobsDelphi Language BASMDelphi Language ObjectPascalDelphi Model Driven Architecture (General)Delphi Model Driven Architecture (Third Party)Delphi MultimediaDelphi Native APIDelphi Non-TechnicalDelphi ObjectPascalDelphi OLE AutomationDelphi OO designDelphi OpenToolsAPIDelphi Reporting-ChartingDelphi RTLDelphi StudentsDelphi TeamSourceDelphi Thirdparty ToolsDelphi Thirdparty Tools (General)Delphi Thirdparty Tools (IntraWeb)Delphi Thirdparty Tools (RaveReports)Delphi UpgradeDelphi VCLDelphi VCL ComponentsDelphi VCL Components UsingDelphi VCL Components WritingDelphi WebServices SOAPDelphi WinAPIDelphi XMLDelphi Installationcomp.lang.pascal.delphi.components.misccomp.lang.pascal.delphi.components.usagecomp.lang.pascal.delphi.components.writingcomp.lang.pascal.delphi.databasescomp.lang.pascal.delphi.misccomp.sources.delphi JBuilder Newsgroups----------------JBuilderJBuilder AnnouncementsJBuilder Applet IssuesJBuilder As400JBuilder CompilerJBuilder CORBA/RMIJBuilder DatabasesJBuilder DB SwingJBuilder DebuggerJBuilder DeploymentJBuilder DocumentationJBuilder EnterpriseJBuilder HandheldJBuilder IDEJBuilder JavaJBuilder JavaAPIJBuilder Java LanguageJBuilder Java SwingJBuilder Java BeansJBuilder Java Beans UsageJBuilder Java Beans DevelopmentJBuilder JBCLJBuilder JDataStoreJBuilder JobsJBuilder LinuxJBuilder MacintoshJBuilder & MobileSetJBuilder MultiLingual AppsJBuilder Non-TechnicalJBuilder OpenToolsJBuilder Servlets (JSP)JBuilder StudentsJBuilder Team DevelopmentJBuilder Thirdparty ToolsJBuilder UpgradeJBuilder Installation InterBase Newsgroups----------------InterBaseInterBase Bug DiscussionInterBase GeneralInterBase IBConsoleInterBase OpenSourceInterBase ReplicationInterBase SQLInterBase ThirdpartyInterBase Installation Miscellaneous Borland Newsgroups----------------AppCenterAppServerEnteraVisiBroker  You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum Powered by phpBB © 2001, 2006 phpBB Group SEO toolkit © 2004-2006 webmedic.