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change `eval-jit-enabled' initialization

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to reflect whether JIT compilation is supported by the build
(i.e., set it to #f initially when the JIT is not supported)
This commit is contained in:
Matthew Flatt 2011-07-25 19:02:04 -04:00
parent 9ace663021
commit 7123996b30
4 changed files with 20 additions and 8 deletions
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4
collects/scribblings/reference/debugging.scrbl
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@ -5,9 +5,9 @@
Racket's built-in debugging support is limited to context (i.e.,
``stack trace'') information that is printed with an exception. In
some cases, disabling the JIT compiler can affect context
some cases, disabling the @tech{JIT} compiler can affect context
information. The @racketmodname[errortrace] library supports more
consistent (independent of the JIT compiler) and precise context
consistent (independent of the @tech{JIT} compiler) and precise context
information. The @racketmodname[racket/trace] library provides simple
tracing support. Finally, the @seclink[#:doc '(lib
"scribblings/drracket/drracket.scrbl") "top"]{DrRacket} programming environment

14
collects/scribblings/reference/eval.scrbl
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@ -460,11 +460,17 @@ which allows such optimizations.}
@defboolparam[eval-jit-enabled on?]{
@guidealso["JIT"]
A parameter that determines whether the native-code just-in-time
compiler (JIT) is enabled for code (compiled or not) that is passed to
the default evaluation handler. The default is @racket[#t], unless
the JIT is disabled through the @Flag{j}/@DFlag{no-jit} command-line
flag to stand-alone Racket (or GRacket), or through the
compiler (@deftech{JIT}) is enabled for code (compiled or not) that is passed to
the default evaluation handler. A true parameter value is effective
only on platforms for which the JIT is supported.
The default is @racket[#t], unless the JIT is not supported by the
current platform, unless it is disabled through the
@Flag{j}/@DFlag{no-jit} command-line flag to stand-alone Racket (or
GRacket), and unless it is disabled through the
@as-index{@envvar{PLTNOMZJIT}} environment variable (set to any
value).}

2
collects/scribblings/reference/runtime.scrbl
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@ -125,7 +125,7 @@ treated as flags for the system).}
A parameter that provides a hint about how much space to reserve for a
newly created thread's local variables. The actual space used by a
computation is affected by just-in-time (JIT) compilation, but it is
computation is affected by @tech{JIT} compilation, but it is
otherwise platform-independent.}

8
src/racket/src/eval.c
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@ -158,8 +158,14 @@
# include "future.h"
#endif
#ifdef MZ_USE_JIT
# define INIT_JIT_ON 1
#else
# define INIT_JIT_ON 0
#endif
/* globals */
SHARED_OK int scheme_startup_use_jit = 1;
SHARED_OK int scheme_startup_use_jit = INIT_JIT_ON;
void scheme_set_startup_use_jit(int v) { scheme_startup_use_jit = v; }
/* THREAD LOCAL SHARED */