mirror of https://github.com/openresty/openresty
You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
183 lines
4.2 KiB
C
183 lines
4.2 KiB
C
=pod
|
|
|
|
LuaJIT
|
|
|
|
=head1 C<jit.*> Library
|
|
|
|
=over
|
|
|
|
=item * LuaJIT
|
|
|
|
=over
|
|
|
|
=item * Download E<rchevron>
|
|
|
|
=item * Installation
|
|
|
|
=item * Running
|
|
|
|
=back
|
|
|
|
=item * Extensions
|
|
|
|
=over
|
|
|
|
=item * FFI Library
|
|
|
|
=over
|
|
|
|
=item * FFI Tutorial
|
|
|
|
=item * ffi.* API
|
|
|
|
=item * FFI Semantics
|
|
|
|
=back
|
|
|
|
=item * jit.* Library
|
|
|
|
=item * Lua/C API
|
|
|
|
=item * Profiler
|
|
|
|
=back
|
|
|
|
=item * Status
|
|
|
|
=over
|
|
|
|
=item * Changes
|
|
|
|
=back
|
|
|
|
=item * FAQ
|
|
|
|
=item * Performance E<rchevron>
|
|
|
|
=item * Wiki E<rchevron>
|
|
|
|
=item * Mailing List E<rchevron>
|
|
|
|
=back
|
|
|
|
The functions in this built-in module control the behavior of the JIT
|
|
compiler engine. Note that JIT-compilation is fully automatic E<mdash>
|
|
you probably won't need to use any of the following functions unless
|
|
you have special needs.
|
|
|
|
=head2 jit.on()
|
|
|
|
jit.off()
|
|
|
|
Turns the whole JIT compiler on (default) or off.
|
|
|
|
These functions are typically used with the command line options C<-j
|
|
on> or C<-j off>.
|
|
|
|
=head2 C<jit.flush()>
|
|
|
|
Flushes the whole cache of compiled code.
|
|
|
|
=head2 jit.on(func|true [,true|false])
|
|
|
|
jit.off(func|true [,true|false])
|
|
|
|
jit.flush(func|true [,true|false])
|
|
|
|
C<jit.on> enables JIT compilation for a Lua function (this is the
|
|
default).
|
|
|
|
C<jit.off> disables JIT compilation for a Lua function and flushes any
|
|
already compiled code from the code cache.
|
|
|
|
C<jit.flush> flushes the code, but doesn't affect the enable/disable
|
|
status.
|
|
|
|
The current function, i.e. the Lua function calling this library
|
|
function, can also be specified by passing C<true> as the first
|
|
argument.
|
|
|
|
If the second argument is C<true>, JIT compilation is also enabled,
|
|
disabled or flushed recursively for all sub-functions of a function.
|
|
With C<false> only the sub-functions are affected.
|
|
|
|
The C<jit.on> and C<jit.off> functions only set a flag which is checked
|
|
when the function is about to be compiled. They do not trigger
|
|
immediate compilation.
|
|
|
|
Typical usage is C<jit.off(true, true)> in the main chunk of a module
|
|
to turn off JIT compilation for the whole module for debugging
|
|
purposes.
|
|
|
|
=head2 C<jit.flush(tr)>
|
|
|
|
Flushes the root trace, specified by its number, and all of its side
|
|
traces from the cache. The code for the trace will be retained as long
|
|
as there are any other traces which link to it.
|
|
|
|
=head2 C<status, ... = jit.status()>
|
|
|
|
Returns the current status of the JIT compiler. The first result is
|
|
either C<true> or C<false> if the JIT compiler is turned on or off. The
|
|
remaining results are strings for CPU-specific features and enabled
|
|
optimizations.
|
|
|
|
=head2 C<jit.version>
|
|
|
|
Contains the LuaJIT version string.
|
|
|
|
=head2 C<jit.version_num>
|
|
|
|
Contains the version number of the LuaJIT core. Version xx.yy.zz is
|
|
represented by the decimal number xxyyzz.
|
|
|
|
=head2 C<jit.os>
|
|
|
|
Contains the target OS name: "Windows", "Linux", "OSX", "BSD", "POSIX"
|
|
or "Other".
|
|
|
|
=head2 C<jit.arch>
|
|
|
|
Contains the target architecture name: "x86", "x64", "arm", "arm64",
|
|
"ppc", "mips" or "mips64".
|
|
|
|
=head2 C<jit.opt.*> E<mdash> JIT compiler optimization control
|
|
|
|
This sub-module provides the backend for the C<-O> command line option.
|
|
|
|
You can also use it programmatically, e.g.:
|
|
|
|
jit.opt.start(2) -- same as -O2
|
|
jit.opt.start("-dce")
|
|
jit.opt.start("hotloop=10", "hotexit=2")
|
|
|
|
Unlike in LuaJIT 1.x, the module is built-in and B<optimization is
|
|
turned on by default!> It's no longer necessary to run
|
|
C<require("jit.opt").start()>, which was one of the ways to enable
|
|
optimization.
|
|
|
|
=head2 C<jit.util.*> E<mdash> JIT compiler introspection
|
|
|
|
This sub-module holds functions to introspect the bytecode, generated
|
|
traces, the IR and the generated machine code. The functionality
|
|
provided by this module is still in flux and therefore undocumented.
|
|
|
|
The debug modules C<-jbc>, C<-jv> and C<-jdump> make extensive use of
|
|
these functions. Please check out their source code, if you want to
|
|
know more.
|
|
|
|
----
|
|
|
|
Copyright E<copy> 2005-2017 Mike Pall E<middot> Contact
|
|
|
|
=cut
|
|
|
|
#Pod::HTML2Pod conversion notes:
|
|
#From file ext_jit.html
|
|
# 5903 bytes of input
|
|
#Mon May 14 13:19:16 2018 agentzh
|
|
# No a_name switch not specified, so will not try to render <a name='...'>
|
|
# No a_href switch not specified, so will not try to render <a href='...'>
|
|
# Deleting phrasal "code" element (`tt_6) because it has super-phrasal elements (`br_2, `br_3) as children.
|
|
# Deleting phrasal "code" element (`tt_2) because it has super-phrasal elements (`br_1) as children.
|