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Looking up location of definition of symbol under cursor using Clang
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clang-lookup is a very simple CLI tool for navigation of C and C++ code bases using the semantic analysis engine of the Clang compiler. Pass it a file, line and column number on the command line and it will print warning/errors and a line describing the location where the symbol at the given source location is defined. clang-lookup is designed to work out-of-the-box without any setup. The disadvantage is that each invocation has to re-parse the given file. For large projects some of the alternatives might work better (see end of this file). Building ======== To build you need to put a compiled version of LLVM 2.9 and Clang 2.9 into the llvm directory. After configuring and building you should have the LLVM and Clang binaries in llvm/Release/bin or llvm/Debug/bin. Use "make" to create a release build of clang-extract and "make DEBUG=1" for a debug build. Usage ===== Call clang_lookup like this: "./build/clang_lookup.sh file line column". It will output a list of compiler diagnostics (warnings, errors). If the symbol at the given location could be resolved it will print a line describing the location of it's definition as it's last output. The format is as follows location=file:line:column for example location=~/project/my_lib.h:20:6 If the symbol could not be resolved clang_lookup will print "location=" and return a non-zero error code. Todo ==== - add reasonable error handling - add automated tests (using tests dir, pre-set locations and results) - fix C++ support (use clang_createTranslationUnitFromSourceFile + clang_command_line_args) - add customizable function to setup clang arguments (include paths, etc.) - pass compiler errors and warnings on to flymake - support reading source from stdin - persistent/cached data base(?) More info ========= Send feedback, bug reports, patches etc. to the following super-obfuscated mail address: jrehders *at* gmx *dot* net https://github.com/sheijk/clang-lookup http://llvm.org http://clang.llvm.org Other tools offering similar functionality. http://blog.wuwon.id.au/2011/10/vim-plugin-for-navigating-c-with.html https://github.com/Sarcasm/irony-mode Both create a persistant index on disk. This can be faster but requires a bit of setup. http://ctags.sourceforge.net/ http://goog-gtags.sourceforge.net/ http://www.gnu.org/s/global/ http://cscope.sourceforge.net/ Mostly depend on regexps or similar hacks. They all are useful tools even for large projects. Their indexing is less accurate than basing such information on the compiler's analysis, though.