Date: Tue, 19 Jul 94 LCLint Version 1.3 now available from MIT by anonymous ftp. LCLint is a lint-like tool for ANSI C. It can be used like a traditional lint to detect certain classes of C errors statically; if formal specifications are also supplied, it can do more powerful checking to detect inconsistencies between specifications and code. Without specifications, LCLint does many of the checks done by a traditional lint. It reports unused declarations, type inconsistencies, use-before-definition, unreachable code, ignored return values, execution paths with no return, likely infinite loops, and fall-through cases. It provides options for stricter type-checking than standard C (e.g., char and bool types can be treated as distinct from ints.). With partial specifications, written in the Larch interface language, LCL, LCLint does stronger checking. For example, a one-line specification file can declare a type as abstract; LCLint checks that the data abstraction barrier is maintained in clients of the type. This provides the advantages of data encapsulation, making programs easier to understand and maintain. Adding more specifications enables further checking, including the detection of: o inconsistent use of global variables o undocumented modification of client-visible state o inconsistent use of an uninitialized formal parameter or failure to initialize an actual parameter o macros specified as functions do not behave functionally LCLint can be customized to a particular coding style using command line flags. Stylized comments may be used to suppress messages and control checking at a local level. LCLint is available by anonymous ftp to larch.lcs.mit.edu in pub/Larch/. The installation package for
is lclint1.3. .tar.Z. Uncompress and `tar xf' this file, and look at INSTALL for further directions. Installation pacakages are available for the following platforms: o DEC Alpha AXP running OSF/1 --- lclint1.3.alpha.tar.Z o DECstation running Ultrix --- lclint1.3.decmips.tar.Z o Sun workstation (Sparc) running Solaris --- lclint1.3.solaris.tar.Z If you would like to use LCLint on some other platform, send mail to [email protected] and we will provide instructions and C source code for building LCLint. Each installation package includes the lclint executable, library files, manual pages, user's guide, an emacs mode, and a few samples. More information on LCLint is available in "Using Specifications to Check Source Code", David Evans, MIT/LCS/TR-628. Available as ftp://larch.lcs.mit.edu/pub/evs/lclint-tr.ps.Z. A web page on the Larch project is available at URL http://larch-www.lcs.mit.edu:8001/larch/ A web page for LCLint specifically, including an html version of the User's Guide, is available at URL http://www.sds.lcs.mit.edu/lclint.html LCLint is the result of a joint R&D project (Larch) involving Digital Equipment Corporation and MIT. It was written in ANSI C by David Evans, building on an LCL checker written by Yang Meng Tan, which in turn built on work done by Gary Feldman, Steve Garland, and Joe Wild. Chris Flatters produced the Solaris port.