.\" Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. .\" See https://llvm.org/LICENSE.txt for license information. .\" SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception .\" $Id: scan-build.1,v 1.1.1.1 2019/11/08 14:29:40 joerg Exp $ .Dd May 25, 2012 .Dt SCAN-BUILD 1 .Os "clang" "3.5" .Sh NAME .Nm scan-build .Nd Clang static analyzer .Sh SYNOPSIS .Nm .Op Fl ohkvV .Op Fl analyze-headers .Op Fl enable-checker Op Ar checker_name .Op Fl disable-checker Op Ar checker_name .Op Fl Fl help .Op Fl Fl help-checkers .Op Fl Fl html-title Op Ar =title .Op Fl Fl keep-going .Op Fl plist .Op Fl plist-html .Op Fl Fl status-bugs .Op Fl Fl use-c++ Op Ar =compiler_path .Op Fl Fl use-cc Op Ar =compiler_path .Op Fl Fl view .Op Fl constraints Op Ar model .Op Fl maxloop Ar N .Op Fl no-failure-reports .Op Fl stats .Op Fl store Op Ar model .Ar build_command .Op build_options .\" .\" Sh DESCRIPTION .Sh DESCRIPTION .Nm is a Perl script that invokes the Clang static analyzer. Options used by .Nm or by the analyzer appear first, followed by the .Ar build_command and any .Ar build_options normally used to build the target system. .Pp The static analyzer employs a long list of checking algorithms, see .Sx CHECKERS . Output can be written in standard .Li .plist and/or HTML format. .Pp The following options are supported: .Bl -tag -width indent .It Fl analyze-headers Also analyze functions in #included files. .It Fl enable-checker Ar checker_name , Fl disable-checker Ar checker_name Enable/disable .Ar checker_name . See .Sx CHECKERS . .It Fl h , Fl Fl help Display this message. .It Fl Fl help-checkers List default checkers, see .Sx CHECKERS . .It Fl Fl html-title Ns Op = Ns Ar title Specify the title used on generated HTML pages. A default title is generated if .Ar title is not specified. .It Fl k , Fl Fl keep-going Add a .Dq keep on going option to .Ar build_command . Currently supports make and xcodebuild. This is a convenience option; one can specify this behavior directly using build options. .It Fl 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. .It Fl plist Output the results as a set of .Li .plist files. (By default the output of .Nm is a set of HTML files.) .It Fl plist-html Output the results as a set of HTML and .plist files .It Fl Fl status-bugs Set exit status to 1 if it found potential bugs and 0 otherwise. By default the exit status of .Nm is that returned by .Ar build_command . .It Fl Fl use-c++ Ns Op = Ns Ar compiler_path Guess the default compiler for your C++ and Objective-C++ code. Use this option to specify an alternate compiler. .It Fl Fl use-cc Ns Op = Ns Ar compiler_path Guess the default compiler for your C and Objective-C code. Use this option to specify an alternate compiler. .It Fl v Verbose output from .Nm and the analyzer. A second and third .Ar v increases verbosity. .It Fl V , Fl Fl view View analysis results in a web browser when the build completes. .It Fl constraints Op Ar model Specify the contraint engine used by the analyzer. By default the .Ql range model is used. Specifying .Ql basic uses a simpler, less powerful constraint model used by checker-0.160 and earlier. .It Fl maxloop Ar 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. .It Fl no-failure-reports Do not create a .Ql failures subdirectory that includes analyzer crash reports and preprocessed source files. .It Fl stats Generates visitation statistics for the project being analyzed. .It Fl store Op Ar model Specify the store model used by the analyzer. By default, the .Ql region store model is used. .Ql region specifies a field- sensitive store model. Users can also specify .Ql basic which is far less precise but can more quickly analyze code. .Ql basic was the default store model for checker-0.221 and earlier. .\" .El .Sh EXIT STATUS .Nm returns the value returned by .Ar build_command unless .Fl Fl status-bugs or .Fl Fl keep-going is used. .\" .\" Other sections not yet used ... .\" .Sh ENVIRONMENT .\" .Sh FILES .\" .Sh DIAGNOSTICS .\" .Sh COMPATIBILITY .\" .Sh HISTORY .\" .Sh BUGS .\" .Sh CHECKERS The checkers listed below may be enabled/disabled using the .Fl enable-checker and .Fl 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 .Fl Fl help-checkers . .Bl -tag -width indent. .It 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). .It core.AttributeNonNull Check for null pointers passed as arguments to a function whose arguments are marked with the .Ql nonnull attribute. .It core.CallAndMessage Check for logical errors for function calls and Objective-C message expressions (e.g., uninitialized arguments, null function pointers). .It core.DivideZero Check for division by zero. .It core.NullDereference Check for dereferences of null pointers. .It core.StackAddressEscape Check that addresses to stack memory do not escape the function. .It core.UndefinedBinaryOperatorResult Check for undefined results of binary operators. .It core.VLASize Check for declarations of VLA of undefined or zero size. .It core.builtin.BuiltinFunctions Evaluate compiler builtin functions, e.g. .Fn alloca . .It core.builtin.NoReturnFunctions Evaluate .Ql panic functions that are known to not return to the caller. .It core.uninitialized.ArraySubscript Check for uninitialized values used as array subscripts. .It core.uninitialized.Assign Check for assigning uninitialized values. .It core.uninitialized.Branch Check for uninitialized values used as branch conditions. .It core.uninitialized.CapturedBlockVariable Check for blocks that capture uninitialized values. .It core.uninitialized.UndefReturn Check for uninitialized values being returned to the caller. .It deadcode.DeadStores Check for values stored to variables that are never read afterwards. .It debug.DumpCFG Display Control-Flow Graphs. .It debug.DumpCallGraph Display Call Graph. .It debug.DumpDominators Print the dominance tree for a given Control-Flow Graph. .It debug.DumpLiveVars Print results of live variable analysis. .It debug.Stats Emit warnings with analyzer statistics. .It debug.TaintTest Mark tainted symbols as such. .It debug.ViewCFG View Control-Flow Graphs using .Ic GraphViz . .It debug.ViewCallGraph View Call Graph using .Ic GraphViz . .It llvm.Conventions Check code for LLVM codebase conventions. .It osx.API Check for proper uses of various Mac OS X APIs. .It osx.AtomicCAS Evaluate calls to .Vt OSAtomic functions. .It osx.SecKeychainAPI Check for proper uses of Secure Keychain APIs. .It osx.cocoa.AtSync Check for null pointers used as mutexes for @synchronized. .It osx.cocoa.ClassRelease Check for sending .Ql retain , .Ql release, or .Ql autorelease directly to a Class. .It osx.cocoa.IncompatibleMethodTypes Warn about Objective-C method signatures with type incompatibilities. .It osx.cocoa.NSAutoreleasePool Warn for suboptimal uses of .Vt NSAutoreleasePool in Objective-C GC mode. .It osx.cocoa.NSError Check usage of NSError** parameters. .It osx.cocoa.NilArg Check for prohibited nil arguments to Objective-C method calls. .It osx.cocoa.RetainCount Check for leaks and improper reference count management. .It osx.cocoa.SelfInit Check that .Ql self is properly initialized inside an initializer method. .It osx.cocoa.UnusedIvars Warn about private ivars that are never used. .It osx.cocoa.VariadicMethodTypes Check for passing non-Objective-C types to variadic methods that expect only Objective-C types. .It osx.coreFoundation.CFError Check usage of CFErrorRef* parameters. .It osx.coreFoundation.CFNumber Check for proper uses of .Fn CFNumberCreate . .It osx.coreFoundation.CFRetainRelease Check for null arguments to .Fn CFRetain , .Fn CFRelease , and .Fn CFMakeCollectable . .It osx.coreFoundation.containers.OutOfBounds Checks for index out-of-bounds when using the .Vt CFArray API. .It osx.coreFoundation.containers.PointerSizedValues Warns if .Vt CFArray , .Vt CFDictionary , or .Vt CFSet are created with non-pointer-size values. .It security.FloatLoopCounter Warn on using a floating point value as a loop counter (CERT: FLP30-C, FLP30-CPP). .It security.insecureAPI.UncheckedReturn Warn on uses of functions whose return values must be always checked. .It security.insecureAPI.getpw Warn on uses of .Fn getpw . .It security.insecureAPI.gets Warn on uses of .Fn gets . .It security.insecureAPI.mkstemp Warn when .Fn mkstemp is passed fewer than 6 X's in the format string. .It security.insecureAPI.mktemp Warn on uses of .Fn mktemp . .It security.insecureAPI.rand Warn on uses of .Fn rand , .Fn random , and related functions. .It security.insecureAPI.strcpy Warn on uses of .Fn strcpy and .Fn strcat . .It security.insecureAPI.vfork Warn on uses of .Fn vfork . .It unix.API Check calls to various UNIX/Posix functions. .It unix.Malloc Check for memory leaks, double free, and use-after-free. .It unix.cstring.BadSizeArg Check the size argument passed into C string functions for common erroneous patterns. .It unix.cstring.NullArg Check for null pointers being passed as arguments to C string functions. .El .\" .Sh EXAMPLE .Ic scan-build -o /tmp/myhtmldir make -j4 .Pp The above example causes analysis reports to be deposited into a subdirectory of .Pa /tmp/myhtmldir and to run .Ic make with the .Fl j4 option. A different subdirectory is created each time .Nm analyzes a project. The analyzer should support most parallel builds, but not distributed builds. .Sh AUTHORS .Nm was written by .An "Ted Kremenek" . Documentation contributed by .An "James K. Lowden" Aq jklowden@schemamania.org .