Apr 2, 2014 · Dead code - code that is executed but redundant, either the results were never used or adds nothing to the rest of the program. Wastes CPU performance. function(){ // dead code since it's calculated but not saved or used anywhere a + b; } Unreachable code - code that will never be reached regardless of logic flow. Difference is it's not executed.

Nov 25, 2016 · Dead code - Executable object code (or data) which, as a result of a design error, cannot be executed (code) or used (data) in an operational configuration of the target computer environment and is not traceable to a system or software requirement. An exception is embedded identifiers. Source. This means that dead code is: executable code

The meaning of the warning should be clear: the code will not be executed - is dead - since IS_LIVE_MOD is a constant, but here is one solution (workaround):

Jan 17, 2019 · However that code is not "dead" as it actually gets executed. What does [...] dead code [/unreachable code] in [a] programming language [mean]? Dead code is code that is useless, because it will never execute. A function is dead if it is not called anywhere, statements can be dead if they are after a return or throw:

Dec 27, 2022 · When I am in a .java file, the unused code is usually grayed out or has a green underline saying this code will probably (probably because of some weird JNI/Reflection corner cases) be unused. But I have this project with thousands of Java files and I want to find all instances of such probable-unused code.

The second warning that Eclipse gives, about dead code, is a warning generated by the compiler, that is not "unreachable", according to the JLS, but in practice is. This is an additional lint style check that Eclipse provides.

Jan 6, 2025 · A perl/python script may be able to find most cases. Regexp to find definition and for finding use. Note: assume some kind of human code (with some coding styles), do not try to do a tools which can handle all C cases (e.g. function definitions in a line with other statements), and forget preprocessors.

May 30, 2012 · SSA Aggressive Dead Code Elimination. Turned on by the `-fssa-dce' option. This pass performs elimination of code considered unnecessary because it has no externally visible effects on the program. It operates in linear time. As for helping the linker with dead code elimination go through this presentation. Two major takeaways being:

Mar 2, 2012 · I have a large python project with multiple libraries that are shared by multiple entry point scripts. This project has been accreting for many years with many authors, so there's a whole lot of dead code. You know the drill. I know that finding all dead code is un-decidable.

Jul 12, 2016 · You can sometimes find a tool that will detect that the code is really dead that will rip out the dead code. SD makes such a tool for Java; it outputs two things: a list of places it thinks (accurately) are dead, and a revised program in which that dead code is gone. If you agree with the dead places list, you keep the revised program.