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/**********************************************************************
mjit.h - Interface to MRI method JIT compiler for Ruby's main thread
Copyright (C) 2017 Vladimir Makarov <vmakarov@redhat.com>.
**********************************************************************/
#ifndef RUBY_MJIT_H
#define RUBY_MJIT_H 1
#include "ruby.h"
/* Special address values of a function generated from the
corresponding iseq by MJIT: */
enum rb_mjit_iseq_func {
/* ISEQ was not queued yet for the machine code generation */
NOT_ADDED_JIT_ISEQ_FUNC = 0,
/* ISEQ is already queued for the machine code generation but the
code is not ready yet for the execution */
NOT_READY_JIT_ISEQ_FUNC = 1,
/* ISEQ included not compilable insn, some internal assertion failed
or the unit is unloaded */
NOT_COMPILED_JIT_ISEQ_FUNC = 2,
/* End mark */
LAST_JIT_ISEQ_FUNC = 3
};
/* MJIT options which can be defined on the MRI command line. */
struct mjit_options {
/* Converted from "jit" feature flag to tell the enablement
information to ruby_show_version(). */
char on;
/* Save temporary files after MRI finish. The temporary files
include the pre-compiled header, C code file generated for ISEQ,
and the corresponding object file. */
char save_temps;
/* Print MJIT warnings to stderr. */
char warnings;
/* Disable compiler optimization and add debug symbols. It can be
very slow. */
char debug;
/* If not 0, all ISeqs are synchronously compiled. For testing. */
unsigned int wait;
/* Number of calls to trigger JIT compilation. For testing. */
unsigned int min_calls;
/* Force printing info about MJIT work of level VERBOSE or
less. 0=silence, 1=medium, 2=verbose. */
int verbose;
/* Maximal permitted number of iseq JIT codes in a MJIT memory
cache. */
int max_cache_size;
};
typedef VALUE (*mjit_func_t)(rb_execution_context_t *, rb_control_frame_t *);
RUBY_SYMBOL_EXPORT_BEGIN
RUBY_EXTERN struct mjit_options mjit_opts;
RUBY_EXTERN int mjit_call_p;
extern void mjit_add_iseq_to_process(const rb_iseq_t *iseq);
extern mjit_func_t mjit_get_iseq_func(struct rb_iseq_constant_body *body);
RUBY_SYMBOL_EXPORT_END
extern int mjit_compile(FILE *f, const struct rb_iseq_constant_body *body, const char *funcname);
extern void mjit_init(struct mjit_options *opts);
extern void mjit_finish(void);
extern void mjit_gc_start_hook(void);
extern void mjit_gc_finish_hook(void);
extern void mjit_free_iseq(const rb_iseq_t *iseq);
extern void mjit_mark(void);
extern struct mjit_cont *mjit_cont_new(rb_execution_context_t *ec);
extern void mjit_cont_free(struct mjit_cont *cont);
extern void mjit_add_class_serial(rb_serial_t class_serial);
extern void mjit_remove_class_serial(rb_serial_t class_serial);
/* A threshold used to reject long iseqs from JITting as such iseqs
takes too much time to be compiled. */
#define JIT_ISEQ_SIZE_THRESHOLD 1000
/* Return TRUE if given ISeq body should be compiled by MJIT */
static inline int
mjit_target_iseq_p(struct rb_iseq_constant_body *body)
{
return (body->type == ISEQ_TYPE_METHOD || body->type == ISEQ_TYPE_BLOCK)
&& body->iseq_size < JIT_ISEQ_SIZE_THRESHOLD;
}
/* Try to execute the current iseq in ec. Use JIT code if it is ready.
If it is not, add ISEQ to the compilation queue and return Qundef. */
static inline VALUE
mjit_exec(rb_execution_context_t *ec)
{
const rb_iseq_t *iseq;
struct rb_iseq_constant_body *body;
long unsigned total_calls;
mjit_func_t func;
if (!mjit_call_p)
return Qundef;
iseq = ec->cfp->iseq;
body = iseq->body;
total_calls = ++body->total_calls;
func = body->jit_func;
if (UNLIKELY((uintptr_t)func <= (uintptr_t)LAST_JIT_ISEQ_FUNC)) {
switch ((enum rb_mjit_iseq_func)func) {
case NOT_ADDED_JIT_ISEQ_FUNC:
if (total_calls == mjit_opts.min_calls && mjit_target_iseq_p(body)) {
mjit_add_iseq_to_process(iseq);
if (UNLIKELY(mjit_opts.wait)) {
func = mjit_get_iseq_func(body);
}
}
return Qundef;
case NOT_READY_JIT_ISEQ_FUNC:
case NOT_COMPILED_JIT_ISEQ_FUNC:
return Qundef;
default: /* to avoid warning with LAST_JIT_ISEQ_FUNC */
break;
}
}
return func(ec, ec->cfp);
}
#endif /* RUBY_MJIT_H */
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