forked from OSchip/llvm-project
350 lines
9.7 KiB
Groff
350 lines
9.7 KiB
Groff
.\" This file is distributed under the University of Illinois Open Source
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.\" License. See LICENSE.TXT for details.
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.\" $Id$
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.Dd May 25, 2012
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.Dt SCAN-BUILD 1
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.Os "clang" "3.5"
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.Sh NAME
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.Nm scan-build
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.Nd Clang static analyzer
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.Sh SYNOPSIS
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.Nm
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.Op Fl ohkvV
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.Op Fl analyze-headers
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.Op Fl enable-checker Op Ar checker_name
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.Op Fl disable-checker Op Ar checker_name
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.Op Fl Fl help
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.Op Fl Fl help-checkers
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.Op Fl Fl html-title Op Ar =title
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.Op Fl Fl keep-going
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.Op Fl plist
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.Op Fl plist-html
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.Op Fl Fl status-bugs
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.Op Fl Fl use-c++ Op Ar =compiler_path
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.Op Fl Fl use-cc Op Ar =compiler_path
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.Op Fl Fl view
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.Op Fl constraints Op Ar model
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.Op Fl maxloop Ar N
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.Op Fl no-failure-reports
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.Op Fl stats
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.Op Fl store Op Ar model
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.Ar build_command
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.Op build_options
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.\"
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.\" Sh DESCRIPTION
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.Sh DESCRIPTION
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.Nm
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is a Perl script that invokes the Clang static analyzer. Options used by
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.Nm
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or by the analyzer appear first, followed by the
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.Ar build_command
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and any
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.Ar build_options
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normally used to build the target system.
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.Pp
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The static analyzer employs a long list of checking algorithms, see
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.Sx CHECKERS .
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Output can be written in standard
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.Li .plist
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and/or HTML format.
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.Pp
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The following options are supported:
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.Bl -tag -width indent
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.It Fl analyze-headers
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Also analyze functions in #included files.
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.It Fl enable-checker Ar checker_name , Fl disable-checker Ar checker_name
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Enable/disable
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.Ar checker_name .
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See
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.Sx CHECKERS .
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.It Fl h , Fl Fl help
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Display this message.
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.It Fl Fl help-checkers
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List default checkers, see
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.Sx CHECKERS .
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.It Fl Fl html-title Ns Op = Ns Ar title
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Specify the title used on generated HTML pages.
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A default title is generated if
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.Ar title
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is not specified.
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.It Fl k , Fl Fl keep-going
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Add a
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.Dq keep on going
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option to
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.Ar build_command .
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Currently supports make and xcodebuild. This is a convenience option;
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one can specify this behavior directly using build options.
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.It Fl o
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Target directory for HTML report files. Subdirectories will be
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created as needed to represent separate invocations
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of the analyzer. If this option is not specified, a directory is
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created in /tmp (TMPDIR on Mac OS X) to store the reports.
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.It Fl plist
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Output the results as a set of
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.Li .plist
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files. (By default the output of
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.Nm
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is a set of HTML files.)
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.It Fl plist-html
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Output the results as a set of HTML and .plist files
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.It Fl Fl status-bugs
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Set exit status to 1 if it found potential bugs and 0 otherwise. By
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default the exit status of
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.Nm
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is that returned by
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.Ar build_command .
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.It Fl Fl use-c++ Ns Op = Ns Ar compiler_path
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Guess the default compiler for your C++ and Objective-C++ code. Use this
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option to specify an alternate compiler.
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.It Fl Fl use-cc Ns Op = Ns Ar compiler_path
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Guess the default compiler for your C and Objective-C code. Use this
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option to specify an alternate compiler.
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.It Fl v
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Verbose output from
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.Nm
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and the analyzer. A second and
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third
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.Ar v
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increases verbosity.
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.It Fl V , Fl Fl view
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View analysis results in a web browser when the build completes.
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.It Fl constraints Op Ar model
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Specify the contraint engine used by the analyzer. By default the
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.Ql range
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model is used. Specifying
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.Ql basic
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uses a simpler, less powerful constraint model used by checker-0.160
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and earlier.
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.It Fl maxloop Ar N
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Specifiy the number of times a block can be visited before giving
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up. Default is 4. Increase for more comprehensive coverage at a
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cost of speed.
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.It Fl no-failure-reports
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Do not create a
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.Ql failures
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subdirectory that includes analyzer crash reports and preprocessed
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source files.
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.It Fl stats
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Generates visitation statistics for the project being analyzed.
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.It Fl store Op Ar model
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Specify the store model used by the analyzer. By default, the
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.Ql region
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store model is used.
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.Ql region
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specifies a field-
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sensitive store model. Users can also specify
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.Ql basic
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which is far less precise but can more quickly analyze code.
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.Ql basic
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was the default store model for checker-0.221 and earlier.
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.\"
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.El
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.Sh EXIT STATUS
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.Nm
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returns the value returned by
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.Ar build_command
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unless
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.Fl Fl status-bugs
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or
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.Fl Fl keep-going
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is used.
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.\"
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.\" Other sections not yet used ...
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.\" .Sh ENVIRONMENT
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.\" .Sh FILES
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.\" .Sh DIAGNOSTICS
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.\" .Sh COMPATIBILITY
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.\" .Sh HISTORY
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.\" .Sh BUGS
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.\"
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.Sh CHECKERS
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The checkers listed below may be enabled/disabled using the
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.Fl enable-checker
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and
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.Fl disable-checker
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options.
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A default group of checkers is run unless explicitly disabled.
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Exactly which checkers constitute the default group is a function
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of the operating system in use; they are listed with
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.Fl Fl help-checkers .
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.Bl -tag -width indent.
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.It core.AdjustedReturnValue
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Check to see if the return value of a function call is different than
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the caller expects (e.g., from calls through function pointers).
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.It core.AttributeNonNull
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Check for null pointers passed as arguments to a function whose arguments are marked with the
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.Ql nonnull
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attribute.
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.It core.CallAndMessage
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Check for logical errors for function calls and Objective-C message expressions (e.g., uninitialized arguments, null function pointers).
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.It core.DivideZero
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Check for division by zero.
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.It core.NullDereference
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Check for dereferences of null pointers.
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.It core.StackAddressEscape
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Check that addresses to stack memory do not escape the function.
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.It core.UndefinedBinaryOperatorResult
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Check for undefined results of binary operators.
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.It core.VLASize
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Check for declarations of VLA of undefined or zero size.
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.It core.builtin.BuiltinFunctions
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Evaluate compiler builtin functions, e.g.
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.Fn alloca .
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.It core.builtin.NoReturnFunctions
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Evaluate
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.Ql panic
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functions that are known to not return to the caller.
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.It core.uninitialized.ArraySubscript
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Check for uninitialized values used as array subscripts.
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.It core.uninitialized.Assign
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Check for assigning uninitialized values.
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.It core.uninitialized.Branch
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Check for uninitialized values used as branch conditions.
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.It core.uninitialized.CapturedBlockVariable
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Check for blocks that capture uninitialized values.
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.It core.uninitialized.UndefReturn
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Check for uninitialized values being returned to the caller.
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.It deadcode.DeadStores
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Check for values stored to variables that are never read afterwards.
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.It debug.DumpCFG
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Display Control-Flow Graphs.
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.It debug.DumpCallGraph
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Display Call Graph.
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.It debug.DumpDominators
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Print the dominance tree for a given Control-Flow Graph.
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.It debug.DumpLiveVars
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Print results of live variable analysis.
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.It debug.Stats
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Emit warnings with analyzer statistics.
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.It debug.TaintTest
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Mark tainted symbols as such.
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.It debug.ViewCFG
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View Control-Flow Graphs using
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.Ic GraphViz .
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.It debug.ViewCallGraph
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View Call Graph using
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.Ic GraphViz .
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.It llvm.Conventions
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Check code for LLVM codebase conventions.
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.It osx.API
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Check for proper uses of various Mac OS X APIs.
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.It osx.AtomicCAS
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Evaluate calls to
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.Vt OSAtomic
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functions.
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.It osx.SecKeychainAPI
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Check for proper uses of Secure Keychain APIs.
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.It osx.cocoa.AtSync
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Check for null pointers used as mutexes for @synchronized.
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.It osx.cocoa.ClassRelease
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Check for sending
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.Ql retain ,
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.Ql release,
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or
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.Ql autorelease
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directly to a Class.
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.It osx.cocoa.IncompatibleMethodTypes
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Warn about Objective-C method signatures with type incompatibilities.
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.It osx.cocoa.NSAutoreleasePool
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Warn for suboptimal uses of
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.Vt NSAutoreleasePool
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in Objective-C GC mode.
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.It osx.cocoa.NSError
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Check usage of NSError** parameters.
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.It osx.cocoa.NilArg
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Check for prohibited nil arguments to Objective-C method calls.
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.It osx.cocoa.RetainCount
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Check for leaks and improper reference count management.
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.It osx.cocoa.SelfInit
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Check that
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.Ql self
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is properly initialized inside an initializer method.
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.It osx.cocoa.UnusedIvars
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Warn about private ivars that are never used.
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.It osx.cocoa.VariadicMethodTypes
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Check for passing non-Objective-C types to variadic methods that expect only Objective-C types.
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.It osx.coreFoundation.CFError
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Check usage of CFErrorRef* parameters.
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.It osx.coreFoundation.CFNumber
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Check for proper uses of
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.Fn CFNumberCreate .
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.It osx.coreFoundation.CFRetainRelease
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Check for null arguments to
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.Fn CFRetain ,
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.Fn CFRelease ,
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and
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.Fn CFMakeCollectable .
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.It osx.coreFoundation.containers.OutOfBounds
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Checks for index out-of-bounds when using the
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.Vt CFArray
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API.
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.It osx.coreFoundation.containers.PointerSizedValues
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Warns if
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.Vt CFArray ,
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.Vt CFDictionary ,
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or
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.Vt CFSet
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are created with non-pointer-size values.
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.It security.FloatLoopCounter
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Warn on using a floating point value as a loop counter (CERT: FLP30-C, FLP30-CPP).
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.It security.insecureAPI.UncheckedReturn
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Warn on uses of functions whose return values must be always checked.
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.It security.insecureAPI.getpw
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Warn on uses of
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.Fn getpw .
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.It security.insecureAPI.gets
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Warn on uses of
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.Fn gets .
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.It security.insecureAPI.mkstemp
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Warn when
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.Fn mkstemp
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is passed fewer than 6 X's in the format string.
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.It security.insecureAPI.mktemp
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Warn on uses of
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.Fn mktemp .
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.It security.insecureAPI.rand
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Warn on uses of
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.Fn rand ,
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.Fn random ,
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and related functions.
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.It security.insecureAPI.strcpy
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Warn on uses of
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.Fn strcpy
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and
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.Fn strcat .
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.It security.insecureAPI.vfork
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Warn on uses of
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.Fn vfork .
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.It unix.API
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Check calls to various UNIX/Posix functions.
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.It unix.Malloc
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Check for memory leaks, double free, and use-after-free.
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.It unix.cstring.BadSizeArg
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Check the size argument passed into C string functions for common
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erroneous patterns.
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.It unix.cstring.NullArg
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Check for null pointers being passed as arguments to C string functions.
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.El
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.\"
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.Sh EXAMPLE
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.Ic scan-build -o /tmp/myhtmldir make -j4
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.Pp
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The above example causes analysis reports to be deposited into
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a subdirectory of
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.Pa /tmp/myhtmldir
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and to run
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.Ic make
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with the
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.Fl j4
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option.
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A different subdirectory is created each time
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.Nm
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analyzes a project.
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The analyzer should support most parallel builds, but not distributed builds.
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.Sh AUTHORS
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.Nm
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was written by
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.An "Ted Kremenek" .
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Documentation contributed by
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.An "James K. Lowden" Aq jklowden@schemamania.org .
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