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Topic: Unreachable code

	Compiler optimization - Wikipedia, the free encyclopedia
		Also, debugging code is usually stepped through in a symbolic debugger, and optimizing transformations, particularly those that reorder code, can make it difficult to identify the output code with the line numbers in the source code from which the code was generated.
		Pieces of code executed close together in time should be placed close together in memory, which increases spatial locality of reference.
		When some code invokes a procedure, it is possible to directly insert the body of the procedure inside the calling code rather than transferring control to it.
	en.wikipedia.org /wiki/Compiler_optimization (3471 words)

	ORBSEARCH.COM \| encyclopedia of knowledge
		Code optimization usually starts with a rethinking of the algorithm used in the program: more often than not, a particular algorithm can be specifically tailored to a particular problem, yelding better performance than a generic algorithm.
		Thus code optimizations should be carefully documented and their effect on future development evaluated.
		Dead code refers to code segments which can never be executed.
	www.orbsearch.com /so/Software_optimization.php (3007 words)

	ICMP type 3, Destination unreachable message
		A Destination Unreachable message that is received with code 0 (Net), 1 (Host), or 5 (Bad Source Route) may result from a routing transient and MUST therefore be interpreted as only a hint, not proof, that the specified destination is unreachable.
		The ICMP Destination Unreachable message is sent by a router in response to a packet which it cannot forward because the destination (or next hop) is unreachable or a service is unavailable.
		Routers MUST use Host Unreachable or Destination Host Unknown codes whenever other hosts on the same destination network might be reachable; otherwise, the source host may erroneously conclude that all hosts on the network are unreachable, and that may not be the case.
	www.networksorcery.com /enp/protocol/icmp/msg3.htm (2097 words)

	[No title] (Site not responding. Last check: 2007-10-15)
		The code field is used to provide a more specific reason as to why the destination was considered unreachable.
		RFC 1122 states that codes 0, 1 and 5 may be caused as a result of a transient network problem, therefore, a TCP connection should not be aborted upon receipt of one of these messages.
		RFC 1122 also stipulates that codes 2 and 3 should be implemented and 6 - 12 must be implemented, however RFC 1812 updates this RFC stating that codes 6, 8, 9 and 10 should not be generated.
	www.camtp.uni-mb.si /books/Internet-Book/ICMP_DestUnreach.html (509 words)

	Unreachable Code Deletion (Site not responding. Last check: 2007-10-15)
		The :none is unreachable, because type inference knows that the argument to `foo-a' must be a `foo', and thus can't be false.
		Not all unreachable code results in a note: * A note is only given when the unreachable code textually appears in the original source.
		Note that these messages are only spurious in not satisfying the intent of the rule that notes are only given when the deleted code appears in the original source; there is always SOME code being deleted when a unreachable code note is printed.
	www.cis.ksu.edu /VirtualHelp/Info/develop/cmu-user.info.Unreachable_Code_Deletion.html (480 words)

	STSC CrossTalk - Software Static Code Analysis Lessons Learned© - Nov 2003 (Site not responding. Last check: 2007-10-15)
		Static analysis does not prove that the requirements the code was developed from were correct or show that the compiled code is correct.
		Object code analysis demonstrates that the object code is an accurate translation of the source code and that the compiler has introduced no errors.
		Static code analysis is an effective software analysis technique; hence, its use is recommended in the context of safety-critical software particularly when conducted constructively as part of the software development process.
	www.stsc.hill.af.mil /crosstalk/2003/11/0311german.html (3945 words)

	Program Optimisation Catalogue - Unreachable Code Elimination (Site not responding. Last check: 2007-10-15)
		Unreachable code is code that can be determined to never be executed.
		code that is reusable between projects but is not used in its full generality in one project (when interprocedural optimisation is performed)
		Unreachable code can often result from optimisations such as constant folding and constant propagation.
	users.chariot.net.au /~matty/optcat/unreachable_code_elimination.html (90 words)

	Larry Osterman's WebLog : What's wrong with this code, part 10 - the answers
		Even though the code had passed my unit tests, and several other developers had tested the code, one of our testers encountered a fairly reliable test failure on his machines.
		The code was correct (or rather, functioning as intended), but some of the assumptions associated with the code were not documented.
		Yes, the compiler can optimize it away, but unreachable code should be removed from the source to eliminate confusion and compiler warnings.
	209.34.241.67 /larryosterman/archive/2005/03/16/396958.aspx (2127 words)

	IntelliJ IDEA :: Code Inspection - easily detect and navigate to different inconsistencies and low-grade locations in ...
		All common syntax errors, as well as all other errors that would be detected during compilation, are highlighted in the source code so you do not need to compile your code in order to find all your mistakes.
		Each error is highlighted in the editor and has the corresponding red link on the right gutter area for easy navigation to the erroneous places, which is especially useful when working with large files.
		If any deprecated code is used in any class or interface, IntelliJ IDEA will recognize it and highlight the corresponding statements directly in the editor.
	www.jetbrains.com /idea/features/code_inspection.html (899 words)

	Code Coverage Analysis
		Code coverage analysis is a structural testing technique (AKA glass box testing and white box testing).
		Basic block coverage is the same as statement coverage except the unit of code measured is each sequence of non-branching statements.
		One argument in favor of statement coverage over other measures is that faults are evenly distributed through code; therefore the percentage of executable statements covered reflects the percentage of faults discovered.
	www.bullseye.com /coverage.html (3104 words)

	Code Transformation Systems
		Unfortunately the user interface code, which had a good portion of the business logic in it, was written in an old, unsupported version of Advanced Revelation R/BASIC (AREV) and wasn't portable to this modern OS.
		Building the libraries for the translated code to use and debugging have taken a team of six programmers over nine months to get it almost completely working.
		The whole project was a stop gap measure to buy time for a real rewrite from scratch, so this code was basically throwaway code, excellent for a learning project.
	www.codetransform.com /fun_with_antlr.html (1632 words)

	RFC 2401 (Site not responding. Last check: 2007-10-15)
		This requires access to the IP source code and is applicable to both hosts and security gateways.
		Source code access for the IP stack is not required in this context, making this implementation approach appropriate for use with legacy systems.
		These costs are associated with the memory needed for IPsec code and data structures, and the computation of integrity check values, encryption and decryption, and added per-packet handling.
	www.freesoft.org /CIE/RFC/bynum.cgi?2401 (16780 words)

	Unreachable Procedures in Object-oriented Programming - Srivastava (ResearchIndex) (Site not responding. Last check: 2007-10-15)
		Abstract: Unreachable procedures are procedures that can never be invoked.
		Using a link-time code modification system, we analyze large linked program modules of C++, C and Fortran.
		For our benchmarks, the primary impact of unreachable code elimination is on code size: the measured impact of this optimization on...
	citeseer.lcs.mit.edu /srivastava93unreachable.html (571 words)

	Unreachable-Code Elimination (Site not responding. Last check: 2007-10-15)
		the code that cannot be executed regardless of the input data.
		A smart compiler could also analyse the pindown function and then remove the else branch as unreachable code and eventually even calculate all results at compile time generating the code that consists only of a return of the final value.
		However, the code is not optimal since there are some obsolete instructions like loading the same value again in the same register containing already this value.
	www.ert.rwth-aachen.de /Projekte/Tools/coal/optimizations/node26.html (359 words)

	[omniORB] TCP timeout delay when host is unreachable: a solution
		> As having unreachable remote sites is part of the "normal" situation for our application (or at least should be supported without large performance impact), this is somehow not acceptable.
		For us, we have chosen to use timeouts for all calls to the Naming Service as if the NS host is not reachable, then our remote objects are also unreachable.
		Code sample: if (CORBA::is_nil(m_rootContext)) { // Root context URL is "corbaname::host:port" CORBA::Object_var obj = m_orb->string_to_object(m_rootURL.c_str()); #ifndef WIN32 // On Solaris, using an object reference on an unreachable host // can take up to 3 minutes to fail.
	www.omniorb-support.com /pipermail/omniorb-list/2004-October/025965.html (308 words)

	Java: Measure Test Coverage with Cobertura
		Code blocks that handle virtual-machine bugs, such as a failure to recognize the UTF-8 encoding.
		Nonetheless, more often than not unreachable statements and methods are vestigial code that no longer has any purpose and can be cut from the code base with no effect.
		Unreachable code should not be part of a code base.
	www.devx.com /ibm/Article/28095 (2333 words)

	C++ skipping parts of code? - GameDev.Net Discussion Forums (Site not responding. Last check: 2007-10-15)
		The actual code that is generated by the compiler sometimes gets changed during optimisation process and thus doesn't match your displayed code anymore and can jump around and miss instructions entirely.
		It might say "unreachable code" or something similar.
		Posted - 6/5/2005 9:19:57 PM The code could be out-of-sync with the executable.
	www.gamedev.net /community/forums/topic.asp?topic_id=323815 (651 words)

	CERT® Coordination Center Reports
		Malicious code is a general term for programs that, when executed, would cause undesired results on a system.
		Much source code is easy to obtain from programmers who make their work freely available on the Internet.
		Web-related programming languages pose new security challenges and concerns because code is downloaded, installed, and run on a user's machine without a review of source code (the recommended practice for secure use of publicly available software).
	www.cert.org /encyc_article/tocencyc.html (9542 words)

	Independent Design Analyses Approach Vs. Static Code Analysis
		Static code analysis can identify unreachable code, infinite loops, initialization errors, code complexity, and output variable ranges that could generate a logic problem.
		After the software code is translated into the intermediate language or IL, the IL is processed and reports are generated.
		These tools are actual program code depicted graphically and topologically to assist in functional and logic analysis of the software.
	www.ida-inc.com /staticanalysis.html (424 words)

	Program Optimisation Catalogue - Dead Code Elimination aka Unreachable Code Elimination (Site not responding. Last check: 2007-10-15)
		The elimination of sections of code in a code component, they would never get run under any circumstances.
		Also, unreachable code might be code which is possibly executed under some compiler options, but not the current options (e.g.
		The option is to attempt not generate it in the first place, or use dead code elimination to clean it up.
	users.chariot.net.au /~matty/optcat/dead_code_elimination.html (149 words)

	Foresys - FORTRAN software reengineering
		Strategic applications were often coded without much concern for portability or reusability.
		FORESYS analyzes old proprietary dialects, and lets you reverse-engineer ill-documented source code, even years after the original authors have moved on.
		Even if the original design documents are no longer available (if they even existed!), you can generate structure charts and data dictionary entries for your code in CASE systems.
	www.simulog.fr /eis/fore1.htm (133 words)

	.NET: warning C4702: unreachable code with throw new CExceptionDerived(...) vc7.1
		As fas as I know that warning arises when you have a line of code that will never be executed (maybe because in the previous line you have a return or you throw an exception.
		Thank you for your comment, you are right,this warning should arise when code has no chance to be executed.
		Keep in mind that sometimes the debugger can be tricky and when an exception is thrown then the debugger may go to the next line as it is executed, so as to check that the code is executed try using another method than the debugger (maybe showing a messagebox or something like that).
	www.experts-exchange.com /Programming/Programming_Languages/Dot_Net/Q_20916754.html (491 words)

	Internet Control Message Protocol "Destination Unreachable" (Code = 0x0D) Packets
		The code value of the ICMP Destination Unreachable packet is 0x0D.
		This is the code value for an administrative denial, which indicates that a router is filtering a port and is not permitting traffic to pass.
		When a packet is undeliverable, a Destination Unreachable ICMP Type 3 message is generated.
	support.microsoft.com /kb/325122 (660 words)

	5.4.5 Unreachable Code Deletion
		Python will delete code whenever it can prove that the code can never be executed.
		When code that appeared in the original source is deleted, the compiler prints a note to indicate a possible problem (or at least unnecessary code.) For example:
		A note is only given when the unreachable code textually appears in the original source.
	www.umiacs.umd.edu /~resnik/ling645_sp2002/cmu_manual/node136.html (582 words)

	.NET Languages / VC - Re: Unreachable code error for exception handling code
		code in the try can't possibly throw those exceptions, so the catch is
		unreachable - that's why the warning is appearing.
		> unreachable - that's why the warning is appearing.
	www.mcse.ms /archive108-2003-11-38287.html (300 words)

	Unreachable Code Elimination (Site not responding. Last check: 2007-10-15)
		Also, as a consequence of other optimizations, certain code may become unreachable.
		In my implementation, I would remove this unreachable code as and when they get generated.
		Hence, there is no separate unreachable code elimination phase of the optimizer.
	www.cs.umd.edu /users/suman/docs/731s98/node5.html (145 words)

	.NET Languages / VC - erroneous 'unreachable code' warning in a throw statement? (Site not responding. Last check: 2007-10-15)
		This code produces a 'unreachable code' warning at line 16 (throw new X...)
		I looked at the assembly code and found nothing that can be left out (i.e.
		no `unreachable code') when an exception is thrown.
	www.mcse.ms /archive108-2003-11-38502.html (224 words)

	Re: could if/else avoid syntax checking compile time unreachable code?
		As others have pointed out, the unreachable code has to be syntax checked.
		But it might not need to be typechecked or checked for names that are in scope (calls to nonexistent functions, etc).
		However it would be too confusing if the normal 'if' started to not give errors for code that the compiler considers unreachable (and different compilers will have different levels of intelligence on that).
	www.mailarchive.ca /lists/comp.lang.c++.moderated/2003-09/1362.html (162 words)

	VC++ - try/catch unreachable code C2407 migrating from vs 6.0 to vs 7.1 .NET
		VC++ - try/catch unreachable code C2407 migrating from vs 6.0 to vs 7.1.NET
		problems with try catch blocks through-out my code.
		me the the code is unreachable C2407 at the catch portion of the
	www.codecomments.com /archive292-2004-7-226351.html (115 words)

	lint Source Code Checker
		You can obtain a description of the messages and, in many cases, code examples, by searching the text file for a string from the message that was generated.
		At appropriate points, stops comments about unreachable code.
		The use of the ellipsis (...) terminator in the definition is suggested in new or updated code.
	docs.sun.com /source/806-3567/lint.html (3526 words)

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	www.softpile.com /Internet/HTML/Review_23863_index.html (219 words)

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