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/*
* %CopyrightBegin%
*
* Copyright Ericsson AB 2004-2009. All Rights Reserved.
*
* The contents of this file are subject to the Erlang Public License,
* Version 1.1, (the "License"); you may not use this file except in
* compliance with the License. You should have received a copy of the
* Erlang Public License along with this software. If not, it can be
* retrieved online at http://www.erlang.org/.
*
* Software distributed under the License is distributed on an "AS IS"
* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
* the License for the specific language governing rights and limitations
* under the License.
*
* %CopyrightEnd%
*/
/* $Id$
* Stack walking helpers for native stack GC procedures.
*/
#ifndef HIPE_X86_GC_H
#define HIPE_X86_GC_H
#include "hipe_x86_asm.h" /* for NR_ARG_REGS */
/* uncomment to simulate & test what the initial PowerPC port will do */
//#define SKIP_YOUNGEST_FRAME
struct nstack_walk_state {
#ifdef SKIP_YOUNGEST_FRAME
const struct sdesc *sdesc0; /* .sdesc0 must be a pointer rvalue */
#else
struct sdesc sdesc0[1]; /* .sdesc0 must be a pointer rvalue */
#endif
};
static inline int nstack_walk_init_check(const Process *p)
{
#ifdef SKIP_YOUNGEST_FRAME
if (!p->hipe.nsp || p->hipe.nsp == p->hipe.nstend)
return 0;
#endif
return 1;
}
static inline Eterm *nstack_walk_nsp_begin(const Process *p)
{
#ifdef SKIP_YOUNGEST_FRAME
unsigned int nstkarity = p->hipe.narity - NR_ARG_REGS;
if ((int)nstkarity < 0)
nstkarity = 0;
return p->hipe.nsp + 1 + nstkarity;
#else
return p->hipe.nsp;
#endif
}
static inline const struct sdesc*
nstack_walk_init_sdesc(const Process *p, struct nstack_walk_state *state)
{
#ifdef SKIP_YOUNGEST_FRAME
const struct sdesc *sdesc = hipe_find_sdesc(p->hipe.nsp[0]);
state->sdesc0 = sdesc;
return sdesc;
#else
unsigned int nstkarity = p->hipe.narity - NR_ARG_REGS;
if ((int)nstkarity < 0)
nstkarity = 0;
state->sdesc0[0].summary = (0 << 9) | (0 << 8) | nstkarity;
state->sdesc0[0].livebits[0] = 0;
/* XXX: this appears to prevent a gcc-4.1.1 bug on x86 */
__asm__ __volatile__("" : : "m"(*state) : "memory");
return &state->sdesc0[0];
#endif
}
static inline void nstack_walk_update_trap(Process *p, const struct sdesc *sdesc0)
{
#ifdef SKIP_YOUNGEST_FRAME
Eterm *nsp = p->hipe.nsp;
p->hipe.nsp = nstack_walk_nsp_begin(p);
hipe_update_stack_trap(p, sdesc0);
p->hipe.nsp = nsp;
#else
hipe_update_stack_trap(p, sdesc0);
#endif
}
static inline Eterm *nstack_walk_nsp_end(const Process *p)
{
return p->hipe.nstend;
}
static inline void nstack_walk_kill_trap(Process *p, Eterm *nsp_end)
{
/* remove gray/white boundary trap */
for (;;) {
--nsp_end;
if (nsp_end[0] == (unsigned long)nbif_stack_trap_ra) {
nsp_end[0] = (unsigned long)p->hipe.ngra;
break;
}
}
}
static inline int nstack_walk_gray_passed_black(const Eterm *gray, const Eterm *black)
{
return gray > black;
}
static inline int nstack_walk_nsp_reached_end(const Eterm *nsp, const Eterm *nsp_end)
{
return nsp >= nsp_end;
}
static inline unsigned int nstack_walk_frame_size(const struct sdesc *sdesc)
{
return sdesc_fsize(sdesc) + 1 + sdesc_arity(sdesc);
}
static inline Eterm *nstack_walk_frame_index(Eterm *nsp, unsigned int i)
{
return &nsp[i];
}
static inline unsigned long
nstack_walk_frame_ra(const Eterm *nsp, const struct sdesc *sdesc)
{
return nsp[sdesc_fsize(sdesc)];
}
static inline Eterm *nstack_walk_next_frame(Eterm *nsp, unsigned int sdesc_size)
{
return nsp + sdesc_size;
}
#endif /* HIPE_X86_GC_H */
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