It adds an indirection. With position independent code you have to load the address of your function and then jump to it. Normally the address of the function is already present in the instruction stream.
There’s a folk-theorem that says C is hard to parse, and C++ essentially impossible. It isn’t true. What is true is that C and C++ are pretty hard to parse using LALR(1) parsers without hacking the parsing machinery and tangling in symbol table data. GCC in fact used to parse them, using YACC and additional … Read more
You can un-check the build automatically in Project menu and then build by hand by type Ctrl + B, or clicking an icon the appears to the right of the printer icon.
There are two aspects to the (lack of) speed for the Scala compiler. Greater startup overhead Scalac itself consists of a LOT of classes which have to be loaded and jit-compiled Scalac has to search the classpath for all root packages and files. Depending on the size of your classpath this can take one to … Read more
It seems like the old simulator process remained open in the background during an XCode update. Simply running sudo killall -9 com.apple.CoreSimulator.CoreSimulatorService in terminal may solve the problem. There shouldn’t be a need for cleaning the project and/or build folder.
Using “Compilers Principles, Techniques, & Tools, 2nd Ed.” (WorldCat) by Aho, Lam, Sethi and Ullman, AKA the Purple Dragon Book, Lexeme pg. 111 A lexeme is a sequence of characters in the source program that matches the pattern for a token and is identified by the lexical analyzer as an instance of that token. Token … Read more
Most up-to-date ppa for nodejs https://launchpad.net/~chris-lea/+archive/node.js/ sudo add-apt-repository ppa:chris-lea/node.js sudo apt-get update sudo apt-get install nodejs NOTE: If your system does not have add-apt-repository, it can be installed like so: sudo apt-get install python-software-properties
Compiling and running a Java application on Mac OSX, or any major operating system, is very easy. Apple includes a fully-functional Java runtime and development environment out-of-the-box with OSX, so all you have to do is write a Java program and use the built-in tools to compile and run it. Writing Your First Program The … Read more
private static final boolean enableFast = false; // … if (enableFast) { // This is removed at compile time } Conditionals like that shown above are evaluated at compile time. If instead you use this private static final boolean enableFast = “true”.equals(System.getProperty(“fast”)); Then any conditions dependent on enableFast will be evaluated by the JIT compiler. … Read more
You can use file and objdump on Linux. In particular, you can look at whether file says “stripped” or “not stripped” (under my Ubuntu 20.04.1 LTS, whether an executable is compiled with -g or not shows not stripped with file command. But the one with -g, shows with debug_info, in addition to that), and whether … Read more