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/*
* %CopyrightBegin%
*
* Copyright Ericsson AB 2001-2016. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* %CopyrightEnd%
*/
#ifndef HIPE_STACK_H
#define HIPE_STACK_H
#include "hipe_arch.h"
/*
* Stack descriptors.
*/
#include <stddef.h> /* offsetof() */
struct sdesc {
struct {
unsigned long hvalue; /* return address */
struct sdesc *next; /* hash collision chain */
} bucket;
unsigned int summary; /* frame size, exn handler presence flag, arity */
#ifdef DEBUG
Eterm dbg_M, dbg_F;
unsigned dbg_A;
#endif
unsigned int livebits[1]; /* size depends on arch & data in summary field */
};
struct sdesc_with_exnra {
unsigned long exnra;
struct sdesc sdesc;
};
static __inline__ unsigned int sdesc_fsize(const struct sdesc *sdesc)
{
return sdesc->summary >> 9;
}
static __inline__ unsigned int sdesc_arity(const struct sdesc *sdesc)
{
return sdesc->summary & 0xFF;
}
static __inline__ unsigned long sdesc_exnra(const struct sdesc *sdesc)
{
if ((sdesc->summary & (1<<8))) {
const char *tmp;
tmp = (const char*)sdesc - offsetof(struct sdesc_with_exnra, sdesc);
return ((const struct sdesc_with_exnra*)tmp)->exnra;
}
return 0;
}
struct hipe_sdesc_table {
unsigned int log2size;
unsigned int mask; /* INV: mask == (1 << log2size)-1 */
unsigned int used;
struct sdesc **bucket;
};
extern struct hipe_sdesc_table hipe_sdesc_table;
extern struct sdesc *hipe_put_sdesc(struct sdesc*);
extern void hipe_init_sdesc_table(struct sdesc*);
extern struct sdesc *hipe_decode_sdesc(Eterm);
#if !defined(__GNUC__) || (__GNUC__ < 2) || (__GNUC__ == 2 && __GNUC_MINOR__ < 96)
#define __builtin_expect(x, expected_value) (x)
#endif
#define likely(x) __builtin_expect((x),1)
#define unlikely(x) __builtin_expect((x),0)
static __inline__ const struct sdesc *hipe_find_sdesc(unsigned long ra)
{
unsigned int i = (ra >> HIPE_RA_LSR_COUNT) & hipe_sdesc_table.mask;
const struct sdesc *sdesc = hipe_sdesc_table.bucket[i];
if (likely(sdesc->bucket.hvalue == ra))
return sdesc;
do {
sdesc = sdesc->bucket.next;
} while (sdesc->bucket.hvalue != ra);
return sdesc;
}
AEXTERN(void,nbif_stack_trap_ra,(void));
extern void hipe_print_nstack(Process*);
extern void hipe_find_handler(Process*);
extern void (*hipe_handle_stack_trap(Process*))(void);
extern void hipe_update_stack_trap(Process*, const struct sdesc*);
extern int hipe_fill_stacktrace(Process*, int, Eterm**);
#if 0 && defined(HIPE_NSTACK_GROWS_UP)
#define hipe_nstack_start(p) ((p)->hipe.nstack)
#define hipe_nstack_used(p) ((p)->hipe.nsp - (p)->hipe.nstack)
#define hipe_nstack_avail(p) ((p)->hipe.nstend - (p)->hipe.nsp)
#endif
#if defined(HIPE_NSTACK_GROWS_DOWN)
#define hipe_nstack_start(p) ((p)->hipe.nsp)
#define hipe_nstack_used(p) ((p)->hipe.nstend - (p)->hipe.nsp)
#define hipe_nstack_avail(p) ((unsigned)((p)->hipe.nsp - (p)->hipe.nstack))
#endif
/* ensure that at least nwords words are available on the native stack */
static __inline__ void hipe_check_nstack(Process *p, unsigned nwords)
{
extern void hipe_inc_nstack(Process *p);
while (hipe_nstack_avail(p) < nwords)
hipe_inc_nstack(p);
}
/*
* GC support procedures
*/
extern Eterm *fullsweep_nstack(Process *p, Eterm *n_htop);
extern void gensweep_nstack(Process *p, Eterm **ptr_old_htop, Eterm **ptr_n_htop);
#endif /* HIPE_STACK_H */
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