This instructs Mono to precompile code that has historically not been
precompiled with AOT.
.TP
+.I data-outfile=FILE.dll.aotdata
+.Sp
+This instructs the AOT code generator to output certain data
+constructs into a separate file. This can reduce the executable
+images some five to twenty percent. Developers need to then ship the
+resulting aotdata as a resource and register a hook to load the data
+on demand by using the
+.I mono_install_load_aot_data_hook
+method.
+.TP
.I direct-pinvoke
.Sp
When this option is specified, P/Invoke methods are invoked directly
llc compiler.
.TP
.I nimt-trampolines=[number]
-When compiling in full aot mode, the IMT trampolines must be precreated
+When compiling in full aot mthis data at startup
+usingode, the IMT trampolines must be precreated
in the AOT image. You can add additional method trampolines with this argument.
Defaults to 128.
.TP
\fBMONO_ENV_OPTIONS\fR environment variable to force all of your child
processes to use one particular kind of GC with the Mono runtime.
.TP
+\fB--arch=32\fR, \fB--arch=64\fR
+(Mac OS X only): Selects the bitness of the Mono binary used, if
+available. If the binary used is already for the selected bitness, nothing
+changes. If not, the execution switches to a binary with the selected
+bitness suffix installed side by side (for example, '/bin/mono --arch=64'
+will switch to '/bin/mono64' iff '/bin/mono' is a 32-bit build).
+.TP
\fB--help\fR, \fB-h\fR
Displays usage instructions.
.TP
The maintainer options are only used by those developing the runtime
itself, and not typically of interest to runtime users or developers.
.TP
+\fB--bisect=optimization:filename\fR
+This flag is used by the automatic optimization bug bisector. It
+takes an optimization flag and a filename of a file containing a list
+of full method names, one per line. When it compiles one of the
+methods in the file it will use the optimization given, in addition to
+the optimizations that are otherwise enabled. Note that if the
+optimization is enabled by default, you should disable it with `-O`,
+otherwise it will just apply to every method, whether it's in the file
+or not.
+.TP
\fB--break method\fR
Inserts a breakpoint before the method whose name is `method'
(namespace.class:methodname). Use `Main' as method name to insert a
Turns off the garbage collection in Mono. This should be only used
for debugging purposes
.TP
-\fBLVM_COUNT\fR
+\fBHTTP_PROXY\fR
+(Also \fBhttp_proxy\fR) If set, web requests using the Mono
+Class Library will be automatically proxied through the given URL.
+Not supported on Windows, Mac OS, iOS or Android. See also \fBNO_PROXY\fR.
+.TP
+\fBLLVM_COUNT\fR
When Mono is compiled with LLVM support, this instructs the runtime to
stop using LLVM after the specified number of methods are JITed.
This is a tool used in diagnostics to help isolate problems in the
.TP
\fBMONO_ARM_FORCE_SOFT_FLOAT\fR
When Mono is built with a soft float fallback on ARM and this variable is set to
-"1", Mono will always emit soft float code, even if a VFP unit is detected.
+"1", Mono will always emit soft float code, even if a VFP unit is
+detected.
+.TP
+\fBMONO_DARWIN_WATCHER_MAXFDS\fR
+This is a debugging aid used to force limits on the FileSystemWatcher
+implementation in Darwin. There is no limit by default.
.TP
\fBMONO_DISABLE_AIO\fR
If set, tells mono NOT to attempt using native asynchronous I/O services. In
this can be set to the name of a file system socket on which an egd or
prngd daemon is listening.
.TP
+\fBMONO_ENABLE_COOP\fR
+This makes the Mono runtime and the SGen garbage collector run in cooperative
+mode as opposed to run on preemptive mode. Preemptive mode is the mode
+that Mono has used historically, going back to the Boehm days, where the
+garbage collector would run at any point and suspend execution of all
+threads as required to perform a garbage collection. The cooperative mode
+on the other hand requires the cooperation of all threads to stop at a
+safe point. This makes for an easier to debug garbage collector. As
+of Mono 4.3.0 it is a work in progress, and while it works, it has not
+been used extensively. This option enabled the feature and allows us to
+find spots that need to be tuned for this mode of operation. Alternatively,
+this mode can be enabled at compile time by using the --with-cooperative-gc
+flag when calling configure.
+.TP
\fBMONO_ENABLE_SHM\fR
Unix only: Enable support for cross-process handles. Cross-process
handles are used to expose process handles, thread handles, named
.RS
.ne 8
.TP
+\fBmax-heap-size=\fIsize\fR
+Sets the maximum size of the heap. The size is specified in bytes and must
+be a power of two. The suffixes `k', `m' and `g' can be used to
+specify kilo-, mega- and gigabytes, respectively. The limit is the sum
+of the nursery, major heap and large object heap. Once the limit is reached
+the application will receive OutOfMemoryExceptions when trying to allocate.
+Not the full extent of memory set in max-heap-size could be available to
+satisfy a single allocation due to internal fragmentation. By default heap
+limits is disabled and the GC will try to use all available memory.
+.TP
\fBnursery-size=\fIsize\fR
Sets the size of the nursery. The size is specified in bytes and must
be a power of two. The suffixes `k', `m' and `g' can be used to
Enables or disables cementing. This can dramatically shorten nursery
collection times on some benchmarks where pinned objects are referred
to from the major heap.
+.TP
+\fBallow-synchronous-major\fR
+This forbids the major collector from performing synchronous major collections.
+The major collector might want to do a synchronous collection due to excessive
+fragmentation. Disabling this might trigger OutOfMemory error in situations that
+would otherwise not happen.
.ne
.RE
.TP
heap corruption issues.
.TP
-\fBdo-not-finalize\fR
+\fBdo-not-finalize(=\fIclasses\fB)\fR
If enabled, finalizers will not be run. Everything else will be
unaffected: finalizable objects will still be put into the
finalization queue where they survive until they're scheduled to
finalize. Once they're not in the queue anymore they will be
-collected regularly.
+collected regularly. If a list of comma-separated class names is
+given, only objects from those classes will not be finalized.
.TP
\fBlog-finalizers\fR
.Sp
The default is "win32".
.TP
-\fBMONO_THREAPOOL\fR
-This environment variable can be used to choose the implementation of
-the ThreadPool used at runtime. By default this uses the long term
-Mono threadpool implementation. But a new "microsoft" value switches
-the threadpool implementation to Microsoft's CoreCLR/ReferenceSource implementation.
-.TP
\fBMONO_TLS_SESSION_CACHE_TIMEOUT\fR
The time, in seconds, that the SSL/TLS session cache will keep it's entry to
avoid a new negotiation between the client and a server. Negotiation are very
at all. The other possible values are 'offline', which performs CRL check (not
implemented yet) and 'online' which uses OCSP and CRL to verify the revocation
status (not implemented yet).
+.TP
+\fBNO_PROXY\fR
+(Also \fBno_proxy\fR) If both \fBHTTP_PROXY\fR and \fBNO_PROXY\fR are
+set, \fBNO_PROXY\fR will be treated as a comma-separated list of "bypass" domains
+which will not be sent through the proxy. Domains in \fBNO_PROXY\fR may contain
+wildcards, as in "*.mono-project.com" or "build????.local". Not supported on
+Windows, Mac OS, iOS or Android.
.SH ENVIRONMENT VARIABLES FOR DEBUGGING
.TP
\fBMONO_ASPNET_NODELETE\fR
.RS
.ne 8
.TP
+\fBalign-small-structs\fR
+Enables small structs alignment to 4/8 bytes.
+.TP
+\fBarm-use-fallback-tls\fR
+When this option is set on ARM, a fallback TLS will be used instead
+of the default fast TLS.
+.TP
\fBbreak-on-unverified\fR
If this variable is set, when the Mono VM runs into a verification
problem, instead of throwing an exception it will break into the
InvalidCast exceptions, it will provide information about the types
involved.
.TP
+\fBcheck-pinvoke-callconv\fR
+This option causes the runtime to check for calling convention
+mismatches when using pinvoke, i.e. mixing cdecl/stdcall. It only
+works on windows. If a mismatch is detected, an
+ExecutionEngineException is thrown.
+.TP
\fBcollect-pagefault-stats\fR
Collects information about pagefaults. This is used internally to
track the number of page faults produced to load metadata. To display
this information you must use this option with "--stats" command line
option.
.TP
+\fBdebug-domain-unload\fR
+When this option is set, the runtime will invalidate the domain memory
+pool instead of destroying it.
+.TP
\fBdont-free-domains\fR
This is an Optimization for multi-AppDomain applications (most
commonly ASP.NET applications). Due to internal limitations Mono,
Instructs the runtime to try to use a generic runtime-invoke wrapper
instead of creating one invoke wrapper.
.TP
+\fBexplicit-null-checks\fR
+Makes the JIT generate an explicit NULL check on variable dereferences
+instead of depending on the operating system to raise a SIGSEGV or
+another form of trap event when an invalid memory location is
+accessed.
+.TP
\fBgdb\fR
Equivalent to setting the \fBMONO_XDEBUG\fR variable, this emits
symbols into a shared library as the code is JITed that can be loaded
IL stack is empty. These are places where the debugger can set a
breakpoint.
.TP
-\fBexplicit-null-checks\fR
-Makes the JIT generate an explicit NULL check on variable dereferences
-instead of depending on the operating system to raise a SIGSEGV or
-another form of trap event when an invalid memory location is
-accessed.
+\fBgen-compact-seq-points\fR
+This option generates sequence points data that maps native offsets to
+IL offsets. Sequence point data is used to display IL offset in
+stacktraces. Stacktraces with IL offsets can be symbolicated using
+mono-symbolicate tool.
.TP
\fBhandle-sigint\fR
Captures the interrupt signal (Control-C) and displays a stack trace
which will garbage collect the code. With this option it is possible
to track down the source of the problems.
.TP
+\fBno-gdb-backtrace\fR
+This option will disable the GDB backtrace emitted by the runtime
+after a SIGSEGV or SIGABRT in unmanaged code.
+.TP
+\fBpartial-sharing\fR
+When this option is set, the runtime can share generated code between
+generic types effectively reducing the amount of code generated.
+.TP
\fBreverse-pinvoke-exceptions
This option will cause mono to abort with a descriptive message when
during stack unwinding after an exception it reaches a native stack
undefined behaviour (since mono doesn't know how to process native
frames), leaks, and possibly crashes too.
.TP
-\fBno-gdb-backtrace\fR
-This option will disable the GDB backtrace emitted by the runtime
-after a SIGSEGV or SIGABRT in unmanaged code.
+\fBsingle-imm-size\fR
+This guarantees that each time managed code is compiled the same
+instructions and registers are used, regardless of the size of used
+values.
+.TP
+\fBsoft-breakpoints\fR
+This option allows using single-steps and breakpoints in hardware
+where we cannot do it with signals.
.TP
\fBsuspend-on-sigsegv\fR
This option will suspend the program when a native SIGSEGV is received.
This is useful for debugging crashes which do not happen under gdb,
since a live process contains more information than a core file.
.TP
-\fBcheck-pinvoke-callconv\fR
-This option causes the runtime to check for calling convention
-mismatches when using pinvoke, i.e. mixing cdecl/stdcall. It only
-works on windows. If a mismatch is detected, an
-ExecutionEngineException is thrown.
+\fBsuspend-on-exception\fR
+This option will suspend the program when an exception occurs.
+.TP
+\fBsuspend-on-unhandled\fR
+This option will suspend the program when an unhandled exception occurs.
.ne
.RE
.TP
synchronously. The default mode of operation is asynchronous which
makes it hard to isolate the root of certain problems.
.TP
-\fBMONO_GENERIC_SHARING\fR
-This environment variable controls the kind of generic sharing used.
-This variable is used by internal JIT developers and should not be
-changed in production. Do not use it.
-.Sp
-The variable controls which classes will have generic code sharing
-enabled.
-.Sp
-Permissible values are:
-.RS
-.TP
-.I "all"
-All generated code can be shared.
-.TP
-.I "collections"
-Only the classes in System.Collections.Generic will have its code
-shared (this is the default value).
-.TP
-.I "corlib"
-Only code in corlib will have its code shared.
-.TP
-.I "none"
-No generic code sharing will be performed.
-.RE
-.Sp
-Generic code sharing by default only applies to collections. The
-Mono JIT by default turns this on.
-.TP
\fBMONO_XDEBUG\fR
When the the MONO_XDEBUG env var is set, debugging info for JITted
code is emitted into a shared library, loadable into gdb. This enables,
projects / mono.git / blobdiff