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=pod
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LuaJIT
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=head1 C<jit.*> Library
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=over
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=item * LuaJIT
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=over
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=item * Download E<rchevron>
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=item * Installation
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=item * Running
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=back
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=item * Extensions
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=over
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=item * FFI Library
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=over
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=item * FFI Tutorial
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=item * ffi.* API
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=item * FFI Semantics
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=back
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=item * jit.* Library
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=item * Lua/C API
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=item * Profiler
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=back
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=item * Status
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=over
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=item * Changes
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=back
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=item * FAQ
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=item * Performance E<rchevron>
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=item * Wiki E<rchevron>
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=item * Mailing List E<rchevron>
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=back
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The functions in this built-in module control the behavior of the JIT
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compiler engine. Note that JIT-compilation is fully automatic E<mdash>
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you probably won't need to use any of the following functions unless
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you have special needs.
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=head2 jit.on()
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jit.off()
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Turns the whole JIT compiler on (default) or off.
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These functions are typically used with the command line options C<-j
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on> or C<-j off>.
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=head2 C<jit.flush()>
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Flushes the whole cache of compiled code.
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=head2 jit.on(func|true [,true|false])
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jit.off(func|true [,true|false])
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jit.flush(func|true [,true|false])
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C<jit.on> enables JIT compilation for a Lua function (this is the
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default).
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C<jit.off> disables JIT compilation for a Lua function and flushes any
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already compiled code from the code cache.
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C<jit.flush> flushes the code, but doesn't affect the enable/disable
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status.
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The current function, i.e. the Lua function calling this library
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function, can also be specified by passing C<true> as the first
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argument.
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If the second argument is C<true>, JIT compilation is also enabled,
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disabled or flushed recursively for all sub-functions of a function.
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With C<false> only the sub-functions are affected.
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The C<jit.on> and C<jit.off> functions only set a flag which is checked
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when the function is about to be compiled. They do not trigger
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immediate compilation.
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Typical usage is C<jit.off(true, true)> in the main chunk of a module
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to turn off JIT compilation for the whole module for debugging
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purposes.
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=head2 C<jit.flush(tr)>
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Flushes the root trace, specified by its number, and all of its side
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traces from the cache. The code for the trace will be retained as long
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as there are any other traces which link to it.
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=head2 C<status, ... = jit.status()>
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Returns the current status of the JIT compiler. The first result is
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either C<true> or C<false> if the JIT compiler is turned on or off. The
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remaining results are strings for CPU-specific features and enabled
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optimizations.
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=head2 C<jit.version>
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Contains the LuaJIT version string.
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=head2 C<jit.version_num>
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Contains the version number of the LuaJIT core. Version xx.yy.zz is
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represented by the decimal number xxyyzz.
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=head2 C<jit.os>
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Contains the target OS name: "Windows", "Linux", "OSX", "BSD", "POSIX"
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or "Other".
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=head2 C<jit.arch>
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Contains the target architecture name: "x86", "x64", "arm", "arm64",
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"ppc", "mips" or "mips64".
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=head2 C<jit.opt.*> E<mdash> JIT compiler optimization control
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This sub-module provides the backend for the C<-O> command line option.
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You can also use it programmatically, e.g.:
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jit.opt.start(2) -- same as -O2
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jit.opt.start("-dce")
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jit.opt.start("hotloop=10", "hotexit=2")
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Unlike in LuaJIT 1.x, the module is built-in and B<optimization is
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turned on by default!> It's no longer necessary to run
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C<require("jit.opt").start()>, which was one of the ways to enable
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optimization.
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=head2 C<jit.util.*> E<mdash> JIT compiler introspection
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This sub-module holds functions to introspect the bytecode, generated
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traces, the IR and the generated machine code. The functionality
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provided by this module is still in flux and therefore undocumented.
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The debug modules C<-jbc>, C<-jv> and C<-jdump> make extensive use of
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these functions. Please check out their source code, if you want to
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know more.
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----
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Copyright E<copy> 2005-2017 Mike Pall E<middot> Contact
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=cut
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#Pod::HTML2Pod conversion notes:
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#From file ext_jit.html
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# 5903 bytes of input
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#Mon May 14 13:19:16 2018 agentzh
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# No a_name switch not specified, so will not try to render <a name='...'>
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# No a_href switch not specified, so will not try to render <a href='...'>
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# Deleting phrasal "code" element (`tt_6) because it has super-phrasal elements (`br_2, `br_3) as children.
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# Deleting phrasal "code" element (`tt_2) because it has super-phrasal elements (`br_1) as children.
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