mirror of
https://github.com/Zenithsiz/ftmemsim-valgrind.git
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50bded71b2
Adds a new warning to memcheck when realloc is used with a size of 0. For a long time this has been "implementation defined" and so non-portable. With C23 it will become UB. Also adds a switch to turn off the error generation and a second switch to select between the most common "implementation" behaviours. The defaults for this second switch are baked in at build time.
173 lines
11 KiB
Plaintext
173 lines
11 KiB
Plaintext
usage: valgrind [options] prog-and-args
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tool-selection option, with default in [ ]:
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--tool=<name> use the Valgrind tool named <name> [memcheck]
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available tools are:
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memcheck cachegrind callgrind helgrind drd
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massif dhat lackey none exp-bbv
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basic user options for all Valgrind tools, with defaults in [ ]:
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-h --help show this message
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--help-debug show this message, plus debugging options
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--help-dyn-options show the dynamically changeable options
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--version show version
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-q --quiet run silently; only print error msgs
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-v --verbose be more verbose -- show misc extra info
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--trace-children=no|yes Valgrind-ise child processes (follow execve)? [no]
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--trace-children-skip=patt1,patt2,... specifies a list of executables
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that --trace-children=yes should not trace into
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--trace-children-skip-by-arg=patt1,patt2,... same as --trace-children-skip=
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but check the argv[] entries for children, rather
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than the exe name, to make a follow/no-follow decision
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--child-silent-after-fork=no|yes omit child output between fork & exec? [no]
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--vgdb=no|yes|full activate gdbserver? [yes]
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full is slower but provides precise watchpoint/step
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--vgdb-error=<number> invoke gdbserver after <number> errors [999999999]
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to get started quickly, use --vgdb-error=0
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and follow the on-screen directions
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--vgdb-stop-at=event1,event2,... invoke gdbserver for given events [none]
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where event is one of:
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startup exit abexit valgrindabexit all none
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--track-fds=no|yes|all track open file descriptors? [no]
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all includes reporting stdin, stdout and stderr
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--time-stamp=no|yes add timestamps to log messages? [no]
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--log-fd=<number> log messages to file descriptor [2=stderr]
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--log-file=<file> log messages to <file>
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--log-socket=ipaddr:port log messages to socket ipaddr:port
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--enable-debuginfod=no|yes query debuginfod servers for missing
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debuginfo [yes]
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user options for Valgrind tools that report errors:
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--xml=yes emit error output in XML (some tools only)
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--xml-fd=<number> XML output to file descriptor
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--xml-file=<file> XML output to <file>
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--xml-socket=ipaddr:port XML output to socket ipaddr:port
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--xml-user-comment=STR copy STR verbatim into XML output
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--demangle=no|yes automatically demangle C++ names? [yes]
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--num-callers=<number> show <number> callers in stack traces [12]
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--error-limit=no|yes stop showing new errors if too many? [yes]
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--exit-on-first-error=no|yes exit code on the first error found? [no]
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--error-exitcode=<number> exit code to return if errors found [0=disable]
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--error-markers=<begin>,<end> add lines with begin/end markers before/after
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each error output in plain text mode [none]
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--show-error-list=no|yes show detected errors list and
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suppression counts at exit [no]
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-s same as --show-error-list=yes
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--keep-debuginfo=no|yes Keep symbols etc for unloaded code [no]
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This allows saved stack traces (e.g. memory leaks)
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to include file/line info for code that has been
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dlclose'd (or similar)
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--show-below-main=no|yes continue stack traces below main() [no]
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--default-suppressions=yes|no
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load default suppressions [yes]
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--suppressions=<filename> suppress errors described in <filename>
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--gen-suppressions=no|yes|all print suppressions for errors? [no]
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--input-fd=<number> file descriptor for input [0=stdin]
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--dsymutil=no|yes run dsymutil on Mac OS X when helpful? [yes]
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--max-stackframe=<number> assume stack switch for SP changes larger
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than <number> bytes [2000000]
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--main-stacksize=<number> set size of main thread's stack (in bytes)
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[min(max(current 'ulimit' value,1MB),16MB)]
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user options for Valgrind tools that replace malloc:
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--alignment=<number> set minimum alignment of heap allocations [not used by this tool]
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--redzone-size=<number> set minimum size of redzones added before/after
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heap blocks (in bytes). [not used by this tool]
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--xtree-memory=none|allocs|full profile heap memory in an xtree [none]
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and produces a report at the end of the execution
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none: no profiling, allocs: current allocated
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size/blocks, full: profile current and cumulative
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allocated size/blocks and freed size/blocks.
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--xtree-memory-file=<file> xtree memory report file [xtmemory.kcg.%p]
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uncommon user options for all Valgrind tools:
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--fullpath-after= (with nothing after the '=')
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show full source paths in call stacks
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--fullpath-after=string like --fullpath-after=, but only show the
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part of the path after 'string'. Allows removal
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of path prefixes. Use this flag multiple times
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to specify a set of prefixes to remove.
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--extra-debuginfo-path=path absolute path to search for additional
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debug symbols, in addition to existing default
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well known search paths.
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--debuginfo-server=ipaddr:port also query this server
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(valgrind-di-server) for debug symbols
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--allow-mismatched-debuginfo=no|yes [no]
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for the above two flags only, accept debuginfo
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objects that don't "match" the main object
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--smc-check=none|stack|all|all-non-file [all-non-file]
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checks for self-modifying code: none, only for
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code found in stacks, for all code, or for all
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code except that from file-backed mappings
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--read-inline-info=yes|no read debug info about inlined function calls
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and use it to do better stack traces.
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[yes] on Linux/Android/Solaris for the tools
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Memcheck/Massif/Helgrind/DRD only.
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[no] for all other tools and platforms.
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--read-var-info=yes|no read debug info on stack and global variables
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and use it to print better error messages in
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tools that make use of it (Memcheck, Helgrind,
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DRD) [no]
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--vgdb-poll=<number> gdbserver poll max every <number> basic blocks [5000]
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--vgdb-shadow-registers=no|yes let gdb see the shadow registers [no]
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--vgdb-prefix=<prefix> prefix for vgdb FIFOs [.../vgdb-pipe]
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--run-libc-freeres=no|yes free up glibc memory at exit on Linux? [yes]
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--run-cxx-freeres=no|yes free up libstdc++ memory at exit on Linux
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and Solaris? [yes]
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--sim-hints=hint1,hint2,... activate unusual sim behaviours [none]
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where hint is one of:
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lax-ioctls lax-doors fuse-compatible enable-outer
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no-inner-prefix no-nptl-pthread-stackcache fallback-llsc none
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--scheduling-quantum=<number> thread-scheduling timeslice in number of
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basic blocks [100000]
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--fair-sched=no|yes|try schedule threads fairly on multicore systems [no]
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--kernel-variant=variant1,variant2,...
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handle non-standard kernel variants [none]
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where variant is one of:
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bproc android-no-hw-tls
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android-gpu-sgx5xx android-gpu-adreno3xx none
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--merge-recursive-frames=<number> merge frames between identical
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program counters in max <number> frames) [0]
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--num-transtab-sectors=<number> size of translated code cache [32]
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more sectors may increase performance, but use more memory.
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--avg-transtab-entry-size=<number> avg size in bytes of a translated
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basic block [0, meaning use tool provided default]
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--aspace-minaddr=0xPP avoid mapping memory below 0xPP [guessed]
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--valgrind-stacksize=<number> size of valgrind (host) thread's stack
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(in bytes) [1048576]
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--show-emwarns=no|yes show warnings about emulation limits? [no]
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--require-text-symbol=:sonamepattern:symbolpattern abort run if the
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stated shared object doesn't have the stated
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text symbol. Patterns can contain ? and *.
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--soname-synonyms=syn1=pattern1,syn2=pattern2,... synonym soname
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specify patterns for function wrapping or replacement.
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To use a non-libc malloc library that is
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in the main exe: --soname-synonyms=somalloc=NONE
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in libxyzzy.so: --soname-synonyms=somalloc=libxyzzy.so
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--sigill-diagnostics=yes|no warn about illegal instructions? [yes]
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--unw-stack-scan-thresh=<number> Enable stack-scan unwind if fewer
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than <number> good frames found [0, meaning "disabled"]
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NOTE: stack scanning is only available on arm-linux.
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--unw-stack-scan-frames=<number> Max number of frames that can be
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recovered by stack scanning [5]
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--resync-filter=no|yes|verbose [yes on MacOS, no on other OSes]
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attempt to avoid expensive address-space-resync operations
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--max-threads=<number> maximum number of threads that valgrind can
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handle [500]
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--realloc-zero-bytes-frees=yes|no [yes on Linux glibc, no otherwise]
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should calls to realloc with a size of 0
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free memory and return NULL or
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allocate/resize and return non-NULL
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user options for Nulgrind:
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(none)
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Extra options read from ~/.valgrindrc, $VALGRIND_OPTS, ./.valgrindrc
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Nulgrind is Copyright (C) 2002-2017, and GNU GPL'd, by Nicholas Nethercote.
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Valgrind is Copyright (C) 2000-2017, and GNU GPL'd, by Julian Seward et al.
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LibVEX is Copyright (C) 2004-2017, and GNU GPL'd, by OpenWorks LLP et al.
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Bug reports, feedback, admiration, abuse, etc, to: www.valgrind.org.
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