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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
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
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
Out Cloudflare timed out contacting the origin server. 523 Origin Is Unreachable Cloudflare could not contact the origin server. 524 A Timeout Occurred
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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)
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
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)
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)
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
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
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
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
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
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)
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
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
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)
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
Programming construct
return a.getId() < b.getId(); default: std::unreachable(); } } }; int main() { vector<Employee> employees; // code to populate database // Sort the database
Function_object
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
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
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)
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
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
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
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)
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
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
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
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)
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
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)
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
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
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
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
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)
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
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)
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
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
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
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
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
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
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
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
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
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
Application designed to probe for open ports
to a port that is not open, the system will respond with an ICMP port unreachable message. Most UDP port scanners use this scanning method, and use the
Port_scanner
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)
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
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
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)
Comparison between two programming languages
automatic memory management using garbage collection which can free unreachable objects even in the presence of cyclic references, but other system resources
Comparison_of_Java_and_C++
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
Form of denial-of-service attack
a victim's network. The attack consists of sending ICMP Destination Unreachable packets to a destination. This works because these packets caused the
BlackNurse
1996 video game
providing them with abilities that allow them to explore previously unreachable areas, all of which are connected with an overworld map. Such abilities
PowerSlave
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
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
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
Software verification technique
on the software, while the concrete state is used to avoid reaching unreachable states. One such tool is ExpliSAT by Sharon Barner, Cindy Eisner, Ziv
Concolic_testing
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)
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
Algorithm
name O into this table. Unfortunately, if any of the sites fails or is unreachable, the hash table size changes, forcing all objects to be remapped. This
Rendezvous_hashing
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
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
Type of garbage collection algorithm
algorithm is a type of garbage collection algorithm used to reclaim unreachable memory. Mark–compact algorithms can be regarded as a combination of the
Mark–compact_algorithm
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
City in Loreto, Peru
Global Voices. Retrieved 26 August 2012. "Connecting the largest city unreachable by road". "The City of Lafayette and the City of Iquitos Forge Historic
Iquitos
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)
UNREACHABLE CODE
UNREACHABLE CODE
Boy/Male
American, Anglo, Australian, British, English, Irish
Cushion; Helpful; Pillow
Surname or Lastname
English
English : variant spelling of Coad.
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.
Girl/Female
Tamil
Code
Boy/Male
Arabic, Muslim
Rockstar
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.
Girl/Female
Hindu
Code
Boy/Male
Assamese, Hindu, Indian, Kashmiri, Malayalam, Marathi, Mythological, Sanskrit, Telugu, Traditional
Unreachable; Goddess Durga
Girl/Female
American, Australian, British, English, Irish
Cushion; Helpful
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."
Boy/Male
Irish American English
Helpful.
Boy/Male
American, British, English, Irish
Helpful
UNREACHABLE CODE
UNREACHABLE CODE
Boy/Male
Arabic
Nature; Character
Girl/Female
Tamil
One of the names of river Narmada, The Sun
Girl/Female
Hindu
Boy/Male
Arabic, Indian, Muslim
Orator; Preacher
Boy/Male
Muslim
Little battle, Companion
Boy/Male
Hindu, Indian
Clever
Girl/Female
Indian, Tamil, Telugu
On Course; The Bed of a River; The Earth
Boy/Male
Indian, Punjabi, Sikh
Victory of Power
Girl/Female
Hebrew
God teaches.
Girl/Female
African, American, Arabic, Christian, Czechoslovakian, French, German, Hawaiian, Hebrew, Indian, Japanese, Kannada, Kurdish, Muslim, Parsi, Sindhi
Happiness; Flower; Blossom; Graceful; Merciful; Grace of God; Unexpected Fortune; Love; Favourite; A Type of Flower; Felicity; Form of Johanna
UNREACHABLE CODE
UNREACHABLE CODE
UNREACHABLE CODE
UNREACHABLE CODE
UNREACHABLE 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.
Incapable of being taught, or not easily instructed; dull in intellect; intractable; unteachable; indocile.
n. sing. & pl.
A body or code of laws.
a.
Unsearchable; inscrutable.
n.
A code; a charter; a grant of privileges.
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.
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.
An unwritten code of law represented to have been given by God to Moses on Sinai.
n.
A codifier; a maker of codes.
a.
Not searchable; inscrutable; hidden; mysterious.
a.
Enacting or threatening punishment; as, a penal statue; the penal code.
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.
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.
v. t.
To signal by means of a flag waved from side to side according to a code adopted for the purpose.
n.
Hence, the code of ceremonies observed by an organization; as, the ritual of the freemasons.
a.
Being within reach.
a.
Relating to crime; -- opposed to civil; as, the criminal code.
n.
A collection or digest of laws; a code.
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.
v. t.
To reduce to a code, as laws.