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SCAN-BUILD(1)          DragonFly General Commands Manual         SCAN-BUILD(1)


scan-build - Clang static analyzer


scan-build [-ohkvV] [-analyze-headers] [-enable-checker [checker_name]] [-disable-checker [checker_name]] [--help] [--help-checkers] [--html-title [=title]] [--keep-going] [-plist] [-plist-html] [--status-bugs] [--use-c++ [=compiler_path]] [--use-cc [=compiler_path]] [--view] [-constraints [model]] [-maxloop N] [-no-failure-reports] [-stats] [-store [model]] build_command [build_options]


scan-build is a Perl script that invokes the Clang static analyzer. Options used by scan-build or by the analyzer appear first, followed by the build_command and any build_options normally used to build the target system. The static analyzer employs a long list of checking algorithms, see CHECKERS. Output can be written in standard .plist and/or HTML format. The following options are supported: -analyze-headers Also analyze functions in #included files. -enable-checker checker_name, -disable-checker checker_name Enable/disable checker_name. See CHECKERS. -h, --help Display this message. --help-checkers List default checkers, see CHECKERS. --html-title[=title] Specify the title used on generated HTML pages. A default title is generated if title is not specified. -k, --keep-going Add a "keep on going" option to build_command. Currently supports make and xcodebuild. This is a convenience option; one can specify this behavior directly using build options. -o Target directory for HTML report files. Subdirectories will be created as needed to represent separate invocations of the analyzer. If this option is not specified, a directory is created in /tmp (TMPDIR on Mac OS X) to store the reports. -plist Output the results as a set of .plist files. (By default the output of scan-build is a set of HTML files.) -plist-html Output the results as a set of HTML and .plist files --status-bugs Set exit status to 1 if it found potential bugs and 0 otherwise. By default the exit status of scan-build is that returned by build_command. --use-c++[=compiler_path] Guess the default compiler for your C++ and Objective-C++ code. Use this option to specify an alternate compiler. --use-cc[=compiler_path] Guess the default compiler for your C and Objective-C code. Use this option to specify an alternate compiler. -v Verbose output from scan-build and the analyzer. A second and third v increases verbosity. -V, --view View analysis results in a web browser when the build completes. -constraints [model] Specify the contraint engine used by the analyzer. By default the `range' model is used. Specifying `basic' uses a simpler, less powerful constraint model used by checker-0.160 and earlier. -maxloop N Specify the number of times a block can be visited before giving up. Default is 4. Increase for more comprehensive coverage at a cost of speed. -no-failure-reports Do not create a `failures' subdirectory that includes analyzer crash reports and preprocessed source files. -stats Generates visitation statistics for the project being analyzed. -store [model] Specify the store model used by the analyzer. By default, the `region' store model is used. `region' specifies a field- sensitive store model. Users can also specify `basic' which is far less precise but can more quickly analyze code. `basic' was the default store model for checker-0.221 and earlier.


scan-build returns the value returned by build_command unless --status-bugs or --keep-going is used.


The checkers listed below may be enabled/disabled using the -enable-checker and -disable-checker options. A default group of checkers is run unless explicitly disabled. Exactly which checkers constitute the default group is a function of the operating system in use; they are listed with --help-checkers. core.AdjustedReturnValue Check to see if the return value of a function call is different than the caller expects (e.g., from calls through function pointers). core.AttributeNonNull Check for null pointers passed as arguments to a function whose arguments are marked with the `nonnull' attribute. core.CallAndMessage Check for logical errors for function calls and Objective-C message expressions (e.g., uninitialized arguments, null function pointers). core.DivideZero Check for division by zero. core.NullDereference Check for dereferences of null pointers. core.StackAddressEscape Check that addresses to stack memory do not escape the function. core.UndefinedBinaryOperatorResult Check for undefined results of binary operators. core.VLASize Check for declarations of VLA of undefined or zero size. core.builtin.BuiltinFunctions Evaluate compiler builtin functions, e.g. alloca(). core.builtin.NoReturnFunctions Evaluate `panic' functions that are known to not return to the caller. core.uninitialized.ArraySubscript Check for uninitialized values used as array subscripts. core.uninitialized.Assign Check for assigning uninitialized values. core.uninitialized.Branch Check for uninitialized values used as branch conditions. core.uninitialized.CapturedBlockVariable Check for blocks that capture uninitialized values. core.uninitialized.UndefReturn Check for uninitialized values being returned to the caller. deadcode.DeadStores Check for values stored to variables that are never read afterwards. debug.DumpCFG Display Control-Flow Graphs. debug.DumpCallGraph Display Call Graph. debug.DumpDominators Print the dominance tree for a given Control-Flow Graph. debug.DumpLiveVars Print results of live variable analysis. debug.Stats Emit warnings with analyzer statistics. debug.TaintTest Mark tainted symbols as such. debug.ViewCFG View Control-Flow Graphs using GraphViz. debug.ViewCallGraph View Call Graph using GraphViz. llvm.Conventions Check code for LLVM codebase conventions. osx.API Check for proper uses of various Mac OS X APIs. osx.AtomicCAS Evaluate calls to OSAtomic functions. osx.SecKeychainAPI Check for proper uses of Secure Keychain APIs. osx.cocoa.AtSync Check for null pointers used as mutexes for @synchronized. osx.cocoa.ClassRelease Check for sending `retain', `release,' or `autorelease' directly to a Class. osx.cocoa.IncompatibleMethodTypes Warn about Objective-C method signatures with type incompatibilities. osx.cocoa.NSAutoreleasePool Warn for suboptimal uses of NSAutoreleasePool in Objective-C GC mode. osx.cocoa.NSError Check usage of NSError** parameters. osx.cocoa.NilArg Check for prohibited nil arguments to Objective-C method calls. osx.cocoa.RetainCount Check for leaks and improper reference count management. osx.cocoa.SelfInit Check that `self' is properly initialized inside an initializer method. osx.cocoa.UnusedIvars Warn about private ivars that are never used. osx.cocoa.VariadicMethodTypes Check for passing non-Objective-C types to variadic methods that expect only Objective-C types. osx.coreFoundation.CFError Check usage of CFErrorRef* parameters. osx.coreFoundation.CFNumber Check for proper uses of CFNumberCreate(). osx.coreFoundation.CFRetainRelease Check for null arguments to CFRetain(), CFRelease(), and CFMakeCollectable(). osx.coreFoundation.containers.OutOfBounds Checks for index out-of-bounds when using the CFArray API. osx.coreFoundation.containers.PointerSizedValues Warns if CFArray, CFDictionary, or CFSet are created with non- pointer-size values. security.FloatLoopCounter Warn on using a floating point value as a loop counter (CERT: FLP30-C, FLP30-CPP). security.insecureAPI.UncheckedReturn Warn on uses of functions whose return values must be always checked. security.insecureAPI.getpw Warn on uses of getpw(). security.insecureAPI.gets Warn on uses of gets(). security.insecureAPI.mkstemp Warn when mkstemp() is passed fewer than 6 X's in the format string. security.insecureAPI.mktemp Warn on uses of mktemp(). security.insecureAPI.rand Warn on uses of rand(), random(), and related functions. security.insecureAPI.strcpy Warn on uses of strcpy() and strcat(). security.insecureAPI.vfork Warn on uses of vfork(). unix.API Check calls to various UNIX/Posix functions. unix.Malloc Check for memory leaks, double free, and use-after-free. unix.cstring.BadSizeArg Check the size argument passed into C string functions for common erroneous patterns. unix.cstring.NullArg Check for null pointers being passed as arguments to C string functions.


scan-build -o /tmp/myhtmldir make -j4 The above example causes analysis reports to be deposited into a subdirectory of /tmp/myhtmldir and to run make with the -j4 option. A different subdirectory is created each time scan-build analyzes a project. The analyzer should support most parallel builds, but not distributed builds.


scan-build was written by Ted Kremenek. Documentation contributed by James K. Lowden <jklowden@schemamania.org>. clang 3.5 May 25, 2012 clang 3.5

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