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Section of code in a program that can never be executed
programming, unreachable code is part of the source code of a program which can never be executed because there exists no control flow path to the code from the
Unreachable_code
Compiler optimization to remove code which does not affect the program results
by simplifying program structure. Dead code includes code that can never be executed (unreachable code) and code that only affects dead variables (written
Dead-code_elimination
Computer code that is never executed
introduction of side-effects caused by the dead code. Dead-code elimination Redundant code Unreachable code Oxbow code 0xDEADC0DE is a magic number written in
Dead_code
Internet protocol used for error messages in network operations
Where: Type must be set to 18 Code must be set to 0 Address mask should be set to the subnet mask Destination unreachable is generated by the host or its
Internet Control Message Protocol
Internet_Control_Message_Protocol
lists standard and notable non-standard HTTP response status codes. Standardized codes are defined by IETF as documented in Request for Comments (RFC)
List_of_HTTP_status_codes
Function in the C and C++ programming languages
whether the declaration is before or after the include. To prevent unreachable code from being added to the final executable if all uses of a function
Inline_(C_and_C++)
Graphical representation of a computer program or algorithm
it cannot possibly be executed, in which case it is called unreachable code. Unreachable code can usually be removed from the control flow graph without
Control-flow_graph
Software that translates code from one programming language to another
of middle end optimizations are removal of useless (dead-code elimination) or unreachable code (reachability analysis), discovery and propagation of constant
Compiler
2023 edition of the C++ programming language standard
std::forward_like std::invoke_r std::bind_back std::byteswap std::unreachable: a function to mark unreachable code made std::tuple compatible with other tuple-like objects
C++23
change the output produced by a program). Unreachable code Code that is never executed (also called dead code). NOP padding A NOP instruction might be
Redundant_code
Java framework
machine binary. GraalVM aggressively removes any unreachable code found within the application's source code as well as any of its dependencies. Combined
Quarkus
Computer fault caused by access to restricted memory
performed by the compiler and the exact structure of a code. In this case, the behavior of unreachable code (the return statement) is undefined, so the compiler
Segmentation_fault
Universal subtype in logic and computer science
bottom, retrieved 2022-04-13 Understanding null safety - never for unreachable code, retrieved 2022-04-13 Pierce, Benjamin C. (2002). Types and Programming
Bottom_type
Topics referred to by the same term
Code 0 (Network Unreachable), a response code for IP in IP Code to Zero, novel This disambiguation page lists articles associated with the title Code-Zero
Code-Zero
Unused program code
to_string(); URL::encode(strInput); fn.result->set_string(input.c_str()); } In this, hexDigits is oxbow code (or oxbow data). Dead code Unreachable code
Oxbow_code
store } } The code in the loop repeatedly overwrites the same variable, so it can be reduced to only one call. Dead code Unreachable code "Insecure Compiler
Dead_store
Algorithm mapping tool
(node) of the control flow graph. Consequently, a silhouette can't have unreachable code in any conditions. DRAKON language is used in the German Aerospace
DRAKON
Aspect of computer programming
objects are garbage collected if they are unreachable from the global object. One way to make an object unreachable is to overwrite the variables or properties
Code_cleanup
Integrated set of tools
division by zero, memory and resource leaks, duplicate code, and various types of dead or unreachable code. C/C++test customers include Samsung Electronics
Parasoft_C/C++test
Tools for optimizing binary code
and applied techniques such as constant propagation, unreachable code elimination, inlining, code layout, and instruction scheduling. Many of these optimizations
Binary_optimizer
When a computer program fails to release unnecessary memory
object is stored in memory but cannot be accessed by the running code (i.e. unreachable memory). A memory leak has symptoms similar to a number of other
Memory_leak
Communications protocol
Supplementary Service Data (USSD), sometimes referred to as "quick codes" or "feature codes", is a communications protocol used by GSM cellular telephones
Unstructured Supplementary Service Data
Unstructured_Supplementary_Service_Data
Object-oriented programming language
objects are no longer in use. Once no references to an object remain, the unreachable memory becomes eligible to be freed automatically by the garbage collector
Java_(programming_language)
American software company (1969–1982)
control flow analysis of the executable code within the COBOL procedure division and identify unreachable code. The Optimizer III version of the product
Capex_Corporation
Software development methodology
section is unreachable. } Overly defensive programming if (is_legacy_compatible(user_config)) { // Strategy: Don't trust that the new code behaves the
Defensive_programming
Telephone number with no cost to its caller
(Additionally, 0800 is reserved for future use.) These numbers are unreachable from other countries. In Switzerland, the toll-free prefix is "0800";
Toll-free_telephone_number
Software static analysis tool used for safety critical applications
identifying key features: Entry/Exit points, Loops, Branches and unreachable code. It provides a summary report drawing attention to undesirable constructs
MALPAS Software Static Analysis Toolset
MALPAS_Software_Static_Analysis_Toolset
Number of machine code instructions required to execute a section of a computer program
for the given input and does not include code that is not relevant for the particular input, or unreachable code. Since one statement written in a high-level
Instruction_path_length
Hand game for two or more players
{\displaystyle 15^{n}} functionally distinct positions. However, there are 21 unreachable positions: 0000, 0100, 0200, 0300, 0400, 1100, 1101, 1200, 1300, 1400
Chopsticks_(hand_game)
about possible deficiencies or bugs, such as undefined control flow, unreachable code, ill-formed escape symbols and potential misuse of the interface primitives
Re2c
Field of research in computer science
elimination to remove conditionally dead or unreachable code at load or runtime, and recombine the remaining code to minimize its memory footprint or improve
Dynamic_software_updating
Programming language
polymorphism via monomorphization, and uses tree shaking to remove unreachable code. Monomorphization avoids boxing of primitive values at the cost of
Flix_(programming_language)
Rule system for formal languages
from the start symbol. X {\displaystyle X} is called useless if it is unreachable or unproductive. X {\displaystyle X} is called nullable if there is a
Context-free_grammar
Software that executes source code directly
default: std::unreachable(); } } Just-in-time (JIT) compilation is the process of converting an intermediate format (i.e. bytecode) to native code at runtime
Interpreter_(computing)
Compiler that optimizes generated code
values and eliminating portions of the control-flow graph that this makes unreachable. Register allocation The most frequently used variables should be kept
Optimizing_compiler
Automated message from an email system
the bounce. Instead, it would have rejected the message with an SMTP error code. This would leave Jack's mail server (at store.example) the obligation to
Bounce_message
Topics referred to by the same term
NUD may stand for: En Nahud Airport's IATA airport code Neighbor unreachability detection, a functionality of the Neighbor Discovery Protocol Niue dollar
NUD
personal wallet addresses. Generally, these non-standard domains are unreachable through the normal DNS resolution process and instead require clients
List of Internet top-level domains
List_of_Internet_top-level_domains
Header file for C programs
and should test code using the macro names specified in the ERRORS section of the man page of the associated function. For source code readability and
Errno.h
Internet protocol used for error messages in network operations
after the header described above. For some messages such as destination unreachable or time exceeded there is no defined message body. Others define a use
ICMPv6
Programming language concept
the following code won't compile: C#: int i = 42; object o = i; // box int j = o; // unbox (error) Console.WriteLine(j); // unreachable line, author might
Boxing_(computer_programming)
Dynamic memory management in the C programming language
new/delete is not applicable, such as garbage collection code or performance-sensitive code, and a combination of malloc and new may be required instead
C_dynamic_memory_allocation
In programming, a reference which does not protect its object from garbage collection
reference as a link" – is considered weakly reachable, and can be treated as unreachable and so may be collected at any time. Some garbage-collected languages
Weak_reference
Unused memory in a computer system
requires analyzing the data, not the code. Semantic garbage is data that will not be accessed, either because it is unreachable (hence also syntactic garbage)
Garbage_(computer_science)
Internet protocol that uses a proxy server
status code: 0x00: request granted 0x01: general failure 0x02: connection not allowed by ruleset 0x03: network unreachable 0x04: host unreachable 0x05:
SOCKS
Network utility used to test the reachability of a host
Q – for this ToS the destination network is unreachable T – for this ToS the destination host is unreachable X – communication administratively prohibited
Ping_(networking_utility)
American technology company
caused widespread 500 errors, slowing down many platforms, making them unreachable or completely down for users around the world. Affected services included
Cloudflare
the legal abortion limit while attempting to obtain consent from an unreachable partner, gave birth in a park restroom, failed to provide appropriate
Neonatal_abandonment_in_Japan
British socialite and child sex trafficker (born 1961)
believe she had a permanent residence. Maxwell has a history of being unreachable during legal proceedings. During the lawsuit filed in 2017 from Ransome
Ghislaine_Maxwell
Notation for ranges or parent directory
putchar(0x80 + (c >> 6) & 0x3f); putchar(0x80 + (c >> 12)); break; default: unreachable(); } } Additionally, GNU C allows a similar range syntax for designated
Ellipsis (computer programming)
Ellipsis_(computer_programming)
Programming construct
return a.getId() < b.getId(); default: std::unreachable(); } } }; int main() { vector<Employee> employees; // code to populate database // Sort the database
Function_object
Character encoding
(unreachable in plain UCS-2), such as Emoji, UTF-16 uses surrogate pairs, which when decoded with UCS-2 would appear as two valid but unmapped code points
GSM_03.38
Style of dynamic typing in object-oriented programming
templates require implementations of all methods that cannot be proven unreachable at compile time. In languages such as Java, Scala and Objective-C, reflection
Duck_typing
Software designed to prevent scraping
"Install Anubis". June 17, 2025. Retrieved May 20, 2026. "Website (DOC) unreachable due to Anubis". January 4, 2026. Ormandy, Tavis. "Anubis". lock.cmpxchg8b
Anubis_(software)
Concept in functional programming
read file at path {}!", p); break; // additional cases... default: std::unreachable(); } } } Enums in Rust are tagged unions, which can be unpacked with
Result_type
Pointer that does not point to a valid object
dangling references are prevented by only destroying objects that are unreachable, meaning they do not have any incoming pointers; this is ensured either
Dangling_pointer
Function called at the end of an object's lifetime
releasing of memory may happen a long time after the object becomes unreachable, making destructors unsuitable for time-critical purposes. In these languages
Destructor (computer programming)
Destructor_(computer_programming)
Data types supported by the C programming language
return "Not found"; case SERVER_ERROR: return "Server error"; default: unreachable(); } } Enum constants are known at compile time, and are often a safer
C_data_types
General-purpose functional programming language
also match the pattern in the first clause, so the second clause is unreachable. Therefore, this definition as a whole exhibits redundancy, and causes
Standard_ML
Type of cyber-attack
example of an attack taking advantage of the required Destination Port Unreachable ICMP packets. A nuke is an old-fashioned denial-of-service attack against
Denial-of-service_attack
Form of computer memory management
cycle is avoided. Once the unreachable set has been determined, the garbage collector may simply release the unreachable objects and leave everything
Tracing_garbage_collection
2004 Japanese visual novel game
strongest human magi. Classmates dub Rin "The Ice Queen" for her cold, unreachable persona at school; however, this is simply a front to hide her actual
Fate/Stay_Night
Algorithm for finding the shortest paths in graphs
node-by-node. Count to infinity if link or node failures render a node unreachable from some set of other nodes, those nodes may spend forever gradually
Bellman–Ford_algorithm
Line of video game cheat cartridges
other cases, codes can make the game more difficult or even unlock game features that developers had scrapped and rendered unreachable in normal play
Game_Genie
2000s social networking website
completely functional." On December 4, 2003, Zuckerberg writes: "Sorry I was unreachable tonight. I just got about three of your missed calls. I was working on
ConnectU
Router architecture
such cases, the router may return an ICMP "destination unreachable" or other appropriate code. Some security policies, however, dictate that the router
Data_plane
Computer network protocol to determine the maximum size of packets to transmit
order for transport layer protocols to operate most efficiently, ICMP Unreachable messages (type 3) should still be permitted. Some routers, including
Path_MTU_Discovery
Type of proxy server
denial-of-service attack, or a software fault can make every fronted service unreachable to outside clients, even when the back-end services themselves remain
Reverse_proxy
Unicode – Unicon – Unix – Unix shell – UNIX System V – Unlambda – USB – Unreachable memory Var'aq – VAX – VBScript – Vector processor – Ventura Publisher
Index_of_computing_articles
Dutch credit bureau (1965-)
report with the BKR if payment is not made by a certain deadline. For BKR codes 1, 2, 3, and 4, the creditor is not required to provide advance notice of
BKR_(credit_bureau)
City in Huánuco, Peru
population of 46,191 inhabitants (2017 census). Tingo María was considered unreachable until 1936, when the Montaña Road reached the settlement. It was then
Tingo_María
Computer network diagnostic tool
traverse, until the destination is reached and returns an ICMP Destination Unreachable message if UDP packets are being used or an ICMP Echo Reply message if
Traceroute
Logic puzzle
connecting pathway must be white. Some puzzles will require the location of "unreachables"—cells that cannot be connected to any number, being either too far away
Nurikabe_(puzzle)
Comics character
with Big Bertha and Doorman, though Mr. Immortal and Squirrel Girl are unreachable. While the team relocates to Detroit, Michigan and arrive at their new
Mr._Immortal
those attempting to vote on 25 June reported that the voting website was unreachable due to high traffic. The Ministry for Foreign Affairs announced on 27
2024 French legislative election
2024_French_legislative_election
Automated method for solving mazes
requiring 4 variables in total for finding the path and detecting the unreachable locations. Nevertheless, the algorithm is not to find the shortest path
Maze-solving_algorithm
Algorithm for finding shortest paths
set is empty, or contains only nodes with infinite distance (which are unreachable), then the algorithm terminates by skipping to step 6. If the only concern
Dijkstra's_algorithm
1962 confrontation between the US and USSR
in Cuba during Operation Anadyr), but after finding that Pliyev was unreachable (possibly due to illness) they decided to authorize the shoot-down themselves
Cuban_Missile_Crisis
American actress (1944–2018)
weeks to come to light." Anderson, according to the scant AP report, was unreachable, and a representative for Locke ignored People's request for comment
Sondra_Locke
1996 video game
have discovered multiple glitches that allow them to reach previously unreachable parts, including, in 2014, a coin not possible to be collected in ordinary
Super_Mario_64
2020 video game
can be used to break through wooden barricades and access otherwise unreachable areas—and to grow in size. An amorphous entity known only as “The Creature”
Carrion_(video_game)
American businessman and rower (born 1981)
completely functional." On December 4, 2003, Zuckerberg writes: "Sorry I was unreachable tonight. I just got about three of your missed calls. I was working on
Tyler_Winklevoss
Audible signal indicating the call cannot be processed
400 Hz tone. The signal is used to indicate that the destination is unreachable, either because all circuits (trunks) are busy, the called number is
Reorder_tone
Principal protocol used to assign IPv4 addresses on an IPv4 network
DHCP server that granted the original lease. If that server is down or unreachable, it will fail to respond to the DHCPREQUEST. However, in that case the
Dynamic Host Configuration Protocol
Dynamic_Host_Configuration_Protocol
Instruction set architecture developed by Digital Equipment Corporation
branches in code. The limited range of the branch instructions meant that, as code grew, the target addresses of some branches would become unreachable. The
PDP-11_architecture
Network diagnostic software
host. When the UDP mode is used, MTR relies on ICMP port unreachable packets (type 3, code 3) when the destination is reached. MTR also supports IPv6
MTR_(software)
Free and open-source web browser for Unix-like systems
menu to a new action bar at the bottom, letting the windows reach yet unreachable widths. "Port the adblocker to the Content Blockers API (#288) · Issues
GNOME_Web
Season of television series
Aayan. Quinn learns that Ghazi did not leave Islamabad and that Saul is unreachable. Carrie and deputy station chief John Redmond, together with Max, use
Homeland_season_4
2007 video game
egg, its recipe is scattered among various screens showing lines of binary code. The Regent Bakery has stated that since the release of Portal, its Black
Portal_(video_game)
Island in the South Atlantic Ocean
2010. Leithead, Alastair (4 July 2017). "Ascension: The increasingly unreachable island". BBC News. Archived from the original on 25 February 2018. Retrieved
Ascension_Island
2019 song by Duncan Laurence
love of your life. It's about the hope to reach something that seems unreachable". The namesake lyric "Small town boy in a big arcade" refers to his experience
Arcade_(song)
Brand by Intel
EV6 could have achieved the same bandwidth numbers, but only at speeds unreachable at the time. Intel's higher bandwidth proved useful in benchmarks for
Pentium_4
Body of statutory and common law
limited partnerships (and even these are not always unreachable). Assets that are almost always unreachable are those to which one does not hold legal title
Asset_protection
needed] flaw in Parity made 513,774 ETH (about US$150 million) unreachable; as of March 2019, the funds were still frozen. Notable cases of electricity
Cryptocurrency_and_crime
1991 video game
access certain portions of the overworld. Areas shrouded in clouds were unreachable. Two dungeons were accessible per week, but the episode ended only when
The Legend of Zelda: A Link to the Past
The_Legend_of_Zelda:_A_Link_to_the_Past
Action-adventure game
that the player can use it as a jumping-off point to access a pathway unreachable with normal jumping, but others are more complex, such as finding several
God_of_War_(2005_video_game)
Finland/Sweden: The city centre of the Finnish city of Tornio is a pene-enclave unreachable directly by land from Finnish territory, although connected to the rest
List_of_enclaves_and_exclaves
law to require the dismissal of religious members who are absent and unreachable for twelve months, a measure intended to prevent clergy from disappearing
Catholic Church sexual abuse cases
Catholic_Church_sexual_abuse_cases
Desktop environment that runs in a web browser
to a network. If a client device is misconfigured or the network is unreachable, then the web desktop is unavailable. Controlled access In some webtop
Web_desktop
Village in Gloucestershire, England
direct journey to London Paddington. However Honeybourne station is unreachable by public transport so travellers can go by bus to Moreton-in-Marsh or
Willersey
UNREACHABLE CODE
UNREACHABLE CODE
Girl/Female
American, Australian, British, English, Irish
Cushion; Helpful
Boy/Male
Assamese, Hindu, Indian, Kashmiri, Malayalam, Marathi, Mythological, Sanskrit, Telugu, Traditional
Unreachable; Goddess Durga
Boy/Male
Arabic, Muslim
Rockstar
Boy/Male
American, British, English, Irish
Helpful
Surname or Lastname
English
English : occupational name for a watchman or guard, from Old English weard ‘guard’ (used as both an agent noun and an abstract noun).Irish : reduced form of McWard, an Anglicized form of Gaelic Mac an Bhaird ‘son of the poet’. The surname occurs throughout Ireland, where three different branches of the family are known as professional poets.Surname adopted by bearers of the Jewish surname Warshawski, Warshawsky or some other Jewish name bearing some similarity to the English name.Americanized form of French Guerin.The surname Ward was brought to North America from England independently by several different bearers in the 17th and 18th centuries. Nathaniel Ward (1578–1652), author of the MA legal code, was born in Haverhill, Suffolk, England, and emigrated to Agawam (Ipswich, MA) in 1633. William Ward was one of the original settlers of Sudbury, MA, in about 1638. Miles Ward came from England to Salem, MA, in about 1639. Thomas Ward (d. 1689) settled in Newport, RI, in 1671; among his descendants were two governors of colonial RI.
Female
Japanese
(1-儀, 2-典, 3-則, 4-法) Japanese unisex name NORI means 1) "ceremony, regalia," 2) "code, precedent," 3) "model, rule, standard," 4) "law, rule."
Surname or Lastname
English
English : nickname for a person who insisted on a strict code of social behavior.German : topographic name for someone who lived on or by a hill, from Middle High German stickel ‘hill’, ‘slope’ + the suffix -er denoting an inhabitant; in the south an occupational name for someone who shapes and sets stakes in vineyards.
Boy/Male
American, Anglo, Australian, British, English, Irish
Cushion; Helpful; Pillow
Girl/Female
Hindu
Code
Boy/Male
Irish American English
Helpful.
Girl/Female
Tamil
Code
Surname or Lastname
English
English : variant spelling of Coad.
UNREACHABLE CODE
UNREACHABLE CODE
Boy/Male
Hebrew Biblical
My brother is a song.
Surname or Lastname
English (chiefly Somerset and Wiltshire)
English (chiefly Somerset and Wiltshire) : metronymic from the medieval female personal name Mag(ge), a pet form of Margaret (see Margeson).
Boy/Male
Muslim
Water
Girl/Female
Biblical
A bucket, a branch.
Girl/Female
Hindu
Beloved
Boy/Male
Gujarati, Hindu, Indian
Born Leader
Boy/Male
Hindu, Indian
First Rays of the Sun
Boy/Male
Indian, Sanskrit
Worthy of Worship
Girl/Female
Tamil
Padmodbhava | பதà¯à®®à¯‹à®¤à¯à®ªà®¾à®µà®¾Â
One who emerged out of the lotus
Girl/Female
Afghan, African, Arabic, German, Hindu, Indian, Kannada, Marathi, Muslim, Sindhi, Tamil
Beautiful; Laughing; Pretty; Powerful
UNREACHABLE CODE
UNREACHABLE CODE
UNREACHABLE CODE
UNREACHABLE CODE
UNREACHABLE CODE
a.
Incapable of being taught, or not easily instructed; dull in intellect; intractable; unteachable; indocile.
a.
Unsearchable; inscrutable.
n.
A collection or digest of laws; a code.
a.
Unsearchable; incapable of being searched into and understood by inquiry or study; impossible or difficult to be explained or accounted for satisfactorily; obscure; incomprehensible; as, an inscrutable design or event.
a.
Being within reach.
n.
An unwritten code of law represented to have been given by God to Moses on Sinai.
v. t.
To signal by means of a flag waved from side to side according to a code adopted for the purpose.
v. t.
To reduce to a code, as laws.
a.
Enacting or threatening punishment; as, a penal statue; the penal code.
n.
A codifier; a maker of codes.
n.
Hence, the code of ceremonies observed by an organization; as, the ritual of the freemasons.
n.
One of the opium alkaloids; a white crystalline substance, C18H21NO3, similar to and regarded as a derivative of morphine, but much feebler in its action; -- called also codeia.
n. sing. & pl.
A body or code of laws.
a.
Relating to crime; -- opposed to civil; as, the criminal code.
n.
A code; a charter; a grant of privileges.
n.
The forms required by good breeding, or prescribed by authority, to be observed in social or official life; observance of the proprieties of rank and occasion; conventional decorum; ceremonial code of polite society.
n.
A law, or rule of doctrine or discipline, enacted by a council and confirmed by the pope or the sovereign; a decision, regulation, code, or constitution made by ecclesiastical authority.
n.
The Jewish or Mosaic code, and that part of Scripture where it is written, in distinction from the gospel; hence, also, the Old Testament.
a.
Not searchable; inscrutable; hidden; mysterious.
n.
Any system of rules or regulations relating to one subject; as, the medical code, a system of rules for the regulation of the professional conduct of physicians; the naval code, a system of rules for making communications at sea means of signals.