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pic_jit.c
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pic_jit.c
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/*
Copyright (C) 2006, The Perl Foundation.
$Id$
=head1 NAME
src/pic_jit.c - Polymorphic Inline Cache to JIT compilation
=head1 DESCRIPTION
Some statically known and simple subroutines are replaced by
their JITted variants, if
- JIT is supported and can JIT subroutines
- arguments passing is simple
- the code is fully JITtable
- and more such checks
TODO:
- save jit_info in sub
- check for multiple calls to the same sub
either reuse code or create new
- handle void calls/returns
=head2 Functions
=over 4
=cut
*/
#include "parrot/parrot.h"
#include "parrot/oplib/ops.h"
#include <assert.h>
#ifdef HAVE_COMPUTED_GOTO
# include "parrot/oplib/core_ops_cgp.h"
#endif
#ifdef HAS_JIT
# include "parrot/exec.h"
# include "jit.h"
# if PIC_TEST
/*
* just for testing the whole scheme ...
.sub main :main
.local int i
i = 32
i = __pic_test(i, 10)
print i
print "\n"
.end
.sub __pic_test
.param int i
.param int j
$I0 = i + j
.return ($I0)
.end
... prints 42, if PIC_TEST is 1, because the C function is called
with -C and -S runcores.
*/
static opcode_t *
pic_test_func(Interp *interp, INTVAL *sig_bits, void **args)
{
INTVAL * const result = (INTVAL*) args[0];
const INTVAL i = (INTVAL) args[1];
const INTVAL j = (INTVAL) args[2];
*result = i + j;
return args[3];
}
# endif
static int
jit_can_compile_sub(Interp *interp, PMC *sub)
{
const jit_arch_info * const info = Parrot_jit_init(interp);
const jit_arch_regs * const regs = info->regs + JIT_CODE_SUB_REGS_ONLY;
INTVAL * const n_regs_used = PMC_sub(sub)->n_regs_used;
/* if the sub is using more regs than the arch has
* we don't JIT it at all
*/
if (n_regs_used[REGNO_INT] > regs->n_mapped_I)
return 0;
if (n_regs_used[REGNO_NUM] > regs->n_mapped_F)
return 0;
/* if the Sub is using S regs, we can't JIT it yet */
if (n_regs_used[REGNO_STR])
return 0;
/* if the Sub is using more than 1 P reg, we can't JIT it yet
* the P reg could be a (recursive) call to a sub
*/
if (n_regs_used[REGNO_PMC] > 1)
return 0;
return 1;
}
static int
args_match_params(Interp *interp, PMC *sig_args,
struct PackFile_ByteCode *seg, opcode_t *start)
{
PMC *sig_params;
int n, type;
if (*start != PARROT_OP_get_params_pc)
return 0;
sig_params = seg->const_table->constants[start[1]]->u.key;
/* verify that we actually can pass arguments */
ASSERT_SIG_PMC(sig_params);
n = parrot_pic_check_sig(interp, sig_args, sig_params, &type);
if (n == -1) {
/* arg count mismatch */
return 0;
}
if (!n) {
/* no args - this would be safe, if the JIT code could already
* deal with no args
* TODO
*/
return 0;
}
type &= ~PARROT_ARG_CONSTANT;
switch (type) {
case PARROT_ARG_INTVAL:
case PARROT_ARG_FLOATVAL:
return 1;
}
return 0;
}
static int
returns_match_results(Interp *interp, PMC *sig_ret, PMC *sig_result)
{
int type;
const int n = parrot_pic_check_sig(interp, sig_ret, sig_result, &type);
if (n == -1) {
/* arg count mismatch */
return 0;
}
if (!n) {
/* no args - this would be safe, if the JIT code could already
* deal with no args
* TODO
*/
return 0;
}
type &= ~PARROT_ARG_CONSTANT;
switch (type) {
case PARROT_ARG_INTVAL:
case PARROT_ARG_FLOATVAL:
return 1;
}
return 0;
}
static int
call_is_safe(Interp *interp, PMC *sub, opcode_t **set_args)
{
PMC *called, *sig_results;
opcode_t * pc = *set_args;
PMC * const sig_args =
PMC_sub(sub)->seg->const_table->constants[pc[1]]->u.key;
/* ignore the signature for now */
pc += 2 + SIG_ELEMS(sig_args);
if (*pc != PARROT_OP_set_p_pc)
return 0;
called = PMC_sub(sub)->seg->const_table->constants[pc[2]]->u.key;
if (called != sub) {
/* we can JIT just recursive subs for now */
return 0;
}
pc += 3;
if (*pc != PARROT_OP_get_results_pc)
return 0;
sig_results = PMC_sub(sub)->seg->const_table->constants[pc[1]]->u.key;
pc += 2 + SIG_ELEMS(sig_results);
if (*pc != PARROT_OP_invokecc_p)
return 0;
pc += 2;
*set_args = pc;
return 1;
}
static int
ops_jittable(Interp *interp, PMC *sub, PMC *sig_results,
struct PackFile_ByteCode *seg,
opcode_t *pc, opcode_t *end, int *flags)
{
while (pc < end) {
/*
* some special opcodes, which are handled, but not marked
* as JITtable
*/
const int op = *pc;
op_info_t * const op_info = interp->op_info_table + op;
int n = op_info->op_count;
int i;
switch (op) {
case PARROT_OP_returncc:
case PARROT_OP_get_params_pc:
goto op_is_ok;
break;
case PARROT_OP_set_returns_pc:
{
PMC * const sig_ret = seg->const_table->constants[pc[1]]->u.key;
if (!returns_match_results(interp, sig_ret, sig_results))
return 0;
}
goto op_is_ok;
break;
case PARROT_OP_set_args_pc:
/* verify call, return address after the call */
if (!call_is_safe(interp, sub, &pc))
return 0;
*flags |= JIT_CODE_RECURSIVE;
continue;
default:
if (op_jit[op].extcall != 0) {
/* non-jitted or JITted vtable */
return 0;
}
break;
}
/*
* there are some JITted opcodes like set_s_s, which we can't
* handle (yet)
*/
for (i = 1; i < n; i++) {
const int type = op_info->types[i - 1];
switch (type) {
case PARROT_ARG_I:
case PARROT_ARG_N:
case PARROT_ARG_IC:
case PARROT_ARG_NC:
break;
default:
return 0;
}
}
op_is_ok:
ADD_OP_VAR_PART(interp, seg, pc, n);
pc += n;
}
return 1;
}
int
parrot_pic_is_safe_to_jit(Interp *interp, PMC *sub,
PMC *sig_args, PMC *sig_results, int *flags)
{
opcode_t *base, *start, *end;
*flags = 0;
/*
* 0) if runcore setting doesn't contain JIT
* forget it
*/
if (!(interp->run_core & PARROT_JIT_CORE))
return 0;
/* 1) if the JIT system can't JIT_CODE_SUB_REGS_ONLY
* or the sub is using too many registers
*/
if (!jit_can_compile_sub(interp, sub))
return 0;
/*
* 2) check if get_params is matching set_args
*/
base = PMC_sub(sub)->seg->base.data;
start = base + PMC_sub(sub)->start_offs;
end = base + PMC_sub(sub)->end_offs;
if (!args_match_params(interp, sig_args, PMC_sub(sub)->seg, start))
return 0;
/*
* 3) verify if all opcodes are JITtable, also check set_returns
* if it's reached
*/
if (!ops_jittable(interp, sub, sig_results,
PMC_sub(sub)->seg, start, end, flags))
return 0;
return 1;
}
funcptr_t
parrot_pic_JIT_sub(Interp *interp, PMC *sub, int flags)
{
# if PIC_TEST
UNUSED(interp);
UNUSED(sub);
return (funcptr_t) pic_test_func;
# else
/*
* create JIT code - just a test
*/
opcode_t * const base = PMC_sub(sub)->seg->base.data;
opcode_t * const start = base + PMC_sub(sub)->start_offs;
opcode_t * const end = base + PMC_sub(sub)->end_offs;
/* TODO pass Sub */
Parrot_jit_info_t * jit_info =
parrot_build_asm(interp,
start, end, NULL,
JIT_CODE_SUB_REGS_ONLY | flags);
if (!jit_info)
return NULLfunc;
return (funcptr_t) jit_info->arena.start;
# endif
}
#else /* HAS_JIT */
int
parrot_pic_is_safe_to_jit(Interp *interp, PMC *sub,
PMC *sig_args, PMC *sig_results, int *flags)
{
return 0;
}
funcptr_t
parrot_pic_JIT_sub(Interp *interp, PMC *sub, int flags) {
UNUSED(interp);
UNUSED(sub);
return NULLfunc;
}
#endif /* HAS_JIT */
/*
=back
=head1 AUTHOR
Leopold Toetsch
=head1 SEE ALSO
F<src/pic.c>, F<src/jit.c>, F<ops/core_ops_cgp.c>,
F<include/parrot/pic.h>, F<ops/pic.ops>
=cut
*/
/*
* Local variables:
* c-file-style: "parrot"
* End:
* vim: expandtab shiftwidth=4:
*/