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c1e67345cf
yap-6.3/C/save.c
vsc 129efd83d8 more fixes for garbage collector 
git-svn-id: https://yap.svn.sf.net/svnroot/yap/trunk@1394 b08c6af1-5177-4d33-ba66-4b1c6b8b522a
2005-09-21 03:49:33 +00:00

1704 lines
41 KiB
C
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/*************************************************************************
* *
* YAP Prolog *
* *
* Yap Prolog was developed at NCCUP - Universidade do Porto *
* *
* Copyright L.Damas, V.S.Costa and Universidade do Porto 1985-1997 *
* *
**************************************************************************
* *
* File: save.c *
* Last rev: *
* mods: *
* comments: saving and restoring a Prolog computation *
* *
*************************************************************************/
#ifdef SCCS
static char SccsId[] = "@(#)save.c 1.3 3/15/90";
#endif
#if _MSC_VER || defined(__MINGW32__)
#include <windows.h>
#endif
#include "absmi.h"
#include "alloc.h"
#if USE_DL_MALLOC
#include "dlmalloc.h"
#endif
#include "yapio.h"
#include "sshift.h"
#include "Foreign.h"
#if HAVE_STRING_H
#include <string.h>
#endif
#if !HAVE_STRNCAT
#define strncat(X,Y,Z) strcat(X,Y)
#endif
#if !HAVE_STRNCPY
#define strncpy(X,Y,Z) strcpy(X,Y)
#endif
#if HAVE_FCNTL_H
#include <fcntl.h>
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#ifdef HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif
#include "iopreds.h"
/********* hack for accesing several kinds of terms. Should be cleaned **/
static char StartUpFile[] = "startup";
static char end_msg[256] ="*** End of YAP saved state *****";
#ifdef DEBUG
/*
*
#FOR DEBUGGING define DEBUG_RESTORE0 to check the file stuff,
#define DEBUG_RESTORE1 to see if it is able to prepare the chain,
#define DEBUG_RESTORE2 to see how things are going,
#define DEBUG_RESTORE3 to check if the atom chain is still a working chain,
* define DEBUG_RESTORE4 if you want to set the output for some
* particular file,
* define DEBUG_RESTORE5 if you want to see how the stacks are being
* cleaned up,
* define DEBUG_RESTORE6 if you want to follow the execution in
*
* Also a file is defined where you can write things, by default stderr
*
* Good Luck
*/
#endif
STATIC_PROTO(int myread, (int, char *, Int));
STATIC_PROTO(void mywrite, (int, char *, Int));
STATIC_PROTO(int open_file, (char *, int));
STATIC_PROTO(void close_file, (void));
STATIC_PROTO(void putout, (CELL));
STATIC_PROTO(void putcellptr, (CELL *));
STATIC_PROTO(CELL get_cell, (void));
STATIC_PROTO(CELL *get_cellptr, ( /* CELL * */ void));
STATIC_PROTO(void put_info, (int, int));
STATIC_PROTO(void save_regs, (int));
STATIC_PROTO(void save_code_info, (void));
STATIC_PROTO(void save_heap, (void));
STATIC_PROTO(void save_stacks, (int));
STATIC_PROTO(void save_crc, (void));
STATIC_PROTO(Int do_save, (int));
STATIC_PROTO(Int p_save, (void));
STATIC_PROTO(Int p_save_program, (void));
STATIC_PROTO(int check_header, (CELL *, CELL *, CELL *, CELL *));
STATIC_PROTO(int get_heap_info, (void));
STATIC_PROTO(int get_regs, (int));
STATIC_PROTO(int get_insts, (OPCODE []));
STATIC_PROTO(int get_hash, (void));
STATIC_PROTO(int CopyCode, (void));
STATIC_PROTO(int CopyStacks, (void));
STATIC_PROTO(int get_coded, (int, OPCODE []));
STATIC_PROTO(void restore_codes, (void));
STATIC_PROTO(Term AdjustDBTerm, (Term, Term *));
STATIC_PROTO(void RestoreDB, (DBEntry *));
STATIC_PROTO(void CleanClauses, (yamop *, yamop *,PredEntry *));
STATIC_PROTO(void rehash, (CELL *, int, int));
STATIC_PROTO(void CleanCode, (PredEntry *));
STATIC_PROTO(void RestoreEntries, (PropEntry *));
STATIC_PROTO(void RestoreInvisibleAtoms, (void));
STATIC_PROTO(void RestoreFreeSpace, (void));
STATIC_PROTO(void restore_heap, (void));
#ifdef DEBUG_RESTORE3
STATIC_PROTO(void ShowAtoms, (void));
STATIC_PROTO(void ShowEntries, (PropEntry *));
#endif
STATIC_PROTO(int OpenRestore, (char *, char *, CELL *, CELL *, CELL *, CELL *));
STATIC_PROTO(void CloseRestore, (void));
STATIC_PROTO(int check_opcodes, (OPCODE []));
STATIC_PROTO(void RestoreHeap, (OPCODE []));
STATIC_PROTO(Int p_restore, (void));
STATIC_PROTO(void restore_heap_regs, (void));
STATIC_PROTO(void restore_regs, (int));
#ifdef MACYAP
STATIC_PROTO(void NewFileInfo, (long, long));
extern int DefVol;
#endif
#if HAVE_IO_H
#include <io.h>
#endif
#ifdef LIGHT
#include <unix.h>
#include <strings.h>
void
LightBug(char *);
static void
LightBug(s)
char *s;
{
}
#endif /* LIGHT */
static int
do_system_error(yap_error_number etype, const char *msg)
{
#if HAVE_SNPRINTF
#if HAVE_STRERROR
snprintf(Yap_ErrorSay,MAX_ERROR_MSG_SIZE,"%s (%s when reading %s)", msg, strerror(errno), Yap_FileNameBuf);
#else
snprintf(Yap_ErrorSay,MAX_ERROR_MSG_SIZE,"%s, (system error %d when reading %s)",msg,errno,Yap_FileNameBuf);
#endif
#else
#if HAVE_STRERROR
sprintf(Yap_ErrorSay,"%s, (%s when reading %s)",msg,strerror(errno),Yap_FileNameBuf);
#else
sprintf(Yap_ErrorSay,"%s, (system error %d when reading %s)",msg,errno,Yap_FileNameBuf);
#endif
#endif
Yap_ErrorMessage = Yap_ErrorSay;
Yap_Error_TYPE = etype;
return -1;
}
#if SHORT_INTS
#ifdef M_WILLIAMS
#include <fcntl.h>
#endif
static int
myread(int fd, char *buff, Int len)
{
while (len > 0) {
int nchars = read(fd, buff, len);
if (nchars < 0) {
return do_system_error(PERMISSION_ERROR_INPUT_PAST_END_OF_STREAM, "bad read on saved state");
}
len -= nchars;
buff += nchars;
}
return len;
}
static void
mywrite(int fd, char *buff, Int len)
{
while (len > 16000) {
write(fd, buff, 16000);
len -= 16000;
buff += 16000;
}
write(fd, buff, (unsigned) len);
}
#else /* SHORT_INTS */
inline static
int myread(int fd, char *buffer, Int len) {
int nread;
while (len > 0) {
nread = read(fd, buffer, (int)len);
if (nread < 1) {
return do_system_error(PERMISSION_ERROR_INPUT_PAST_END_OF_STREAM,"bad read on saved state");
}
buffer += nread;
len -= nread;
}
return len;
}
inline static
void mywrite(int fd, char *buff, Int len) {
Int nwritten;
while (len > 0) {
nwritten = (Int)write(fd, buff, (int)len);
if (nwritten < 0) {
Yap_ErrorMessage = "bad write on saved state";
Yap_Error(SYSTEM_ERROR,TermNil,Yap_ErrorMessage);
}
buff += nwritten;
len -= nwritten;
}
}
#endif /* SHORT_INTS */
#define FullSaved 1
/* Where the code was before */
typedef CELL *CELLPOINTER;
static int splfild = 0;
#ifdef DEBUG
#ifdef DEBUG_RESTORE4
static FILE *errout;
#else
#define errout Yap_stderr
#endif
#endif /* DEBUG */
static Int OldHeapUsed;
static CELL which_save;
/* Open a file to read or to write */
static int
open_file(char *my_file, int flag)
{
int splfild;
#ifdef M_WILLIAMS
if (flag & O_CREAT)
splfild = creat(my_file, flag);
else
splfild = open(my_file, flag);
if (splfild < 0) {
#else
#ifdef O_BINARY
#if _MSC_VER
if ((splfild = _open(my_file, flag | O_BINARY), _S_IREAD | _S_IWRITE) < 0)
#else
if ((splfild = open(my_file, flag | O_BINARY, 0775)) < 0)
#endif
#else /* O_BINARY */
if ((splfild = open(my_file, flag, 0755)) < 0)
#endif /* O_BINARY */
#endif /* M_WILLIAMS */
{
splfild = 0; /* We do not have an open file */
return -1;
}
#ifdef undf0
fprintf(errout, "Opened file %s\n", my_file);
#endif
return splfild;
}
static void
close_file(void)
{
if (splfild == 0)
return;
close(splfild);
splfild = 0;
}
/* stores a cell in a file */
static void
putout(CELL l)
{
mywrite(splfild, (char *) &l, sizeof(CELL));
}
/* stores a pointer to a cell in a file */
static void
putcellptr(CELL *l)
{
mywrite(splfild, (char *) &l, sizeof(CELLPOINTER));
}
/* gets a cell from a file */
static CELL
get_cell(void)
{
CELL l;
myread(splfild, (char *) &l, Unsigned(sizeof(CELL)));
return (l);
}
/* gets a cell from a file */
static CELL
get_header_cell(void)
{
CELL l;
int count = 0, n;
while (count < sizeof(CELL)) {
if ((n = read(splfild, &l, sizeof(CELL)-count)) < 0) {
do_system_error(PERMISSION_ERROR_INPUT_PAST_END_OF_STREAM,"failed to read saved state header");
return 0L;
}
count += n;
}
return l;
}
/* gets a pointer to cell from a file */
static CELL *
get_cellptr(void)
{
CELL *l;
myread(splfild, (char *) &l, Unsigned(sizeof(CELLPOINTER)));
return (l);
}
/*
* writes the header (at the moment YAPV*), info about what kind of saved
* set, the work size, and the space ocuppied
*/
static void
put_info(int info, int mode)
{
char msg[256];
sprintf(msg, "#!/bin/sh\nexec_dir=${YAPBINDIR:-%s}\nexec $exec_dir/yap $0 \"$@\"\n%cYAPV%s", BIN_DIR, 1, YAP_VERSION);
mywrite(splfild, msg, strlen(msg) + 1);
putout(Unsigned(info));
/* say whether we just saved the heap or everything */
putout(mode);
/* current state of stacks, to be used by SavedInfo */
/* space available in heap area */
putout(Unsigned(Yap_GlobalBase)-Unsigned(Yap_HeapBase));
/* space available for stacks */
putout(Unsigned(Yap_LocalBase)-Unsigned(Yap_GlobalBase));
/* space available for trail */
putout(Unsigned(Yap_TrailTop)-Unsigned(Yap_TrailBase));
/* Space used in heap area */
putout(Unsigned(HeapTop)-Unsigned(Yap_HeapBase));
/* Space used for local stack */
putout(Unsigned(LCL0)-Unsigned(ASP));
/* Space used for global stack */
putout(Unsigned(H) - Unsigned(Yap_GlobalBase));
/* Space used for trail */
putout(Unsigned(TR) - Unsigned(Yap_TrailBase));
}
static void
save_regs(int mode)
{
/* save all registers */
putout((CELL)compile_arrays);
if (mode == DO_EVERYTHING) {
putcellptr((CELL *)CP);
putcellptr(ENV);
putcellptr(ASP);
/* putout((CELL)N); */
putcellptr(H0);
putcellptr(LCL0);
putcellptr(H);
putcellptr(HB);
putcellptr((CELL *)B);
putcellptr((CELL *)TR);
putcellptr(YENV);
putcellptr(S);
putcellptr((CELL *)P);
putout(CreepFlag);
putout(EX);
#ifdef COROUTINING
putout(DelayedVars);
#endif
}
putout(CurrentModule);
if (mode == DO_EVERYTHING) {
#ifdef COROUTINING
putout(WokenGoals);
#endif
#ifdef DEPTH_LIMIT
putout(DEPTH);
#endif
putout(GcGeneration);
}
/* The operand base */
putcellptr(CellPtr(XREGS));
putout(which_save);
/* Now start by saving the code */
/* the heap boundaries */
putcellptr(CellPtr(Yap_HeapBase));
putcellptr(CellPtr(HeapTop));
/* and the space it ocuppies */
putout(Unsigned(HeapUsed));
/* Then the start of the free code */
putcellptr(CellPtr(FreeBlocks));
putcellptr(AuxSp);
putcellptr(CellPtr(AuxTop));
if (mode == DO_EVERYTHING) {
/* put the old trail base, just in case it moves again */
putout(ARG1);
if (which_save == 2) {
putout(ARG2);
}
putcellptr(CellPtr(Yap_TrailBase));
}
}
static void
save_code_info(void)
{
/* First the instructions */
{
op_numbers i;
OPCODE my_ops[_std_top+1];
for (i = _Ystop; i <= _std_top; ++i)
my_ops[i] = Yap_opcode(i);
mywrite(splfild, (char *)my_ops, sizeof(OPCODE)*(_std_top+1));
}
/* and the current character codes */
mywrite(splfild, Yap_chtype, NUMBER_OF_CHARS);
}
static void
save_heap(void)
{
int j;
/* Then save the whole heap */
#if defined(YAPOR) || defined(TABLING)
/* skip the local and global data structures */
j = Unsigned(&GLOBAL) - Unsigned(Yap_HeapBase);
putout(j);
mywrite(splfild, (char *) Yap_HeapBase, j);
j = Unsigned(HeapTop) - Unsigned(&HashChain);
putout(j);
mywrite(splfild, (char *) &HashChain, j);
#else
j = Unsigned(HeapTop) - Unsigned(Yap_HeapBase);
/* store 10 more cells because of the memory manager */
mywrite(splfild, (char *) Yap_HeapBase, j);
#endif /* YAPOR || TABLING */
}
static void
save_stacks(int mode)
{
int j;
switch (mode) {
case DO_EVERYTHING:
/* Now, go and save the state */
/* Save the local stack */
j = Unsigned(LCL0) - Unsigned(ASP);
mywrite(splfild, (char *) ASP, j);
/* Save the global stack */
j = Unsigned(H) - Unsigned(Yap_GlobalBase);
mywrite(splfild, (char *) Yap_GlobalBase, j);
/* Save the trail */
j = Unsigned(TR) - Unsigned(Yap_TrailBase);
mywrite(splfild, (char *) Yap_TrailBase, j);
break;
case DO_ONLY_CODE:
{
tr_fr_ptr tr_ptr = TR;
while (tr_ptr != (tr_fr_ptr)Yap_TrailBase) {
CELL val = TrailTerm(tr_ptr-1);
if (IsVarTerm(val)) {
CELL *d1 = VarOfTerm(val);
if (d1 < (CELL *)HeapTop)
putout(val);
} else if (IsPairTerm(val)) {
CELL *d1 = RepPair(val);
if (d1 < (CELL *)HeapTop)
putout(val);
}
tr_ptr--;
}
}
putcellptr(NULL);
break;
}
}
static void
save_crc(void)
{
/* Save a CRC */
mywrite(splfild, end_msg, 256);
#ifdef MACYAP
NewFileInfo('TEXT', 'MYap');
if (DefVol)
SetVol(0l, DefVol);
DefVol = 0;
#endif
}
static Int
do_save(int mode) {
#ifdef MACYAP
NewFileInfo('YAPS', 'MYap');
#endif
Term t1 = Deref(ARG1);
if (!Yap_GetName(Yap_FileNameBuf, YAP_FILENAME_MAX, t1)) {
Yap_Error(TYPE_ERROR_LIST,t1,"save/1");
return FALSE;
}
Yap_CloseStreams(TRUE);
if ((splfild = open_file(Yap_FileNameBuf, O_WRONLY | O_CREAT)) < 0) {
Yap_Error(SYSTEM_ERROR,MkAtomTerm(Yap_LookupAtom(Yap_FileNameBuf)),
"restore/1, open(%s)", strerror(errno));
return(FALSE);
}
put_info(FullSaved, mode);
save_regs(mode);
save_code_info();
save_heap();
save_stacks(mode);
save_crc();
close_file();
return (TRUE);
}
/* Saves a complete prolog environment */
static Int
p_save(void)
{
#if defined(YAPOR) || defined(THREADS)
if (NOfThreads != 1) {
Yap_Error(SYSTEM_ERROR,TermNil,"cannot perform save: more than a worker/thread running");
return(FALSE);
}
#endif
which_save = 1;
return(do_save(DO_EVERYTHING));
}
/* Saves a complete prolog environment */
static Int
p_save2(void)
{
#if defined(YAPOR) || defined(THREADS)
if (NOfThreads != 1) {
Yap_Error(SYSTEM_ERROR,TermNil,
"cannot perform save: more than a worker/thread running");
return(FALSE);
}
#endif
which_save = 2;
return(do_save(DO_EVERYTHING) && Yap_unify(ARG2,MkIntTerm(1)));
}
/* Just save the program, not the stacks */
static Int
p_save_program(void)
{
which_save = 0;
return do_save(DO_ONLY_CODE);
}
/* Now, to restore the saved code */
/* First check out if we are dealing with a valid file */
static int
check_header(CELL *info, CELL *ATrail, CELL *AStack, CELL *AHeap)
{
char pp[80];
char msg[256];
CELL hp_size, gb_size, lc_size, tr_size, mode;
/* make sure we always check if there are enough bytes */
/* skip the first line */
do {
if (read(splfild, pp, 1) < 0) {
do_system_error(PERMISSION_ERROR_INPUT_PAST_END_OF_STREAM,"failed to scan first line from saved state");
return FAIL_RESTORE;
}
} while (pp[0] != 1);
/* now check the version */
sprintf(msg, "YAPV%s", YAP_VERSION);
{
int count = 0, n, to_read = Unsigned(strlen(msg) + 1);
while (count < to_read) {
if ((n = read(splfild, pp, to_read-count)) < 0) {
do_system_error(PERMISSION_ERROR_INPUT_PAST_END_OF_STREAM,"failed to scan version info from saved state");
return FAIL_RESTORE;
}
count += n;
}
}
if (pp[0] != 'Y' && pp[1] != 'A' && pp[0] != 'P') {
Yap_ErrorMessage = Yap_ErrorSay;
strncpy(Yap_ErrorMessage, "saved state ", MAX_ERROR_MSG_SIZE);
strncat(Yap_ErrorMessage, Yap_FileNameBuf, MAX_ERROR_MSG_SIZE);
strncat(Yap_ErrorMessage, " failed to match `YAP\'", MAX_ERROR_MSG_SIZE);
Yap_Error_TYPE = CONSISTENCY_ERROR;
return FAIL_RESTORE;
}
if (strcmp(pp, msg) != 0) {
Yap_ErrorMessage = Yap_ErrorSay;
strncpy(Yap_ErrorMessage, "saved state ", MAX_ERROR_MSG_SIZE);
strncat(Yap_ErrorMessage, Yap_FileNameBuf, MAX_ERROR_MSG_SIZE);
strncat(Yap_ErrorMessage, " failed to match version ID", MAX_ERROR_MSG_SIZE);
Yap_Error_TYPE = CONSISTENCY_ERROR;
return FAIL_RESTORE;
}
/* check info on header */
/* ignore info on saved state */
*info = get_header_cell();
if (Yap_ErrorMessage)
return FAIL_RESTORE;
/* check the restore mode */
mode = get_header_cell();
if (Yap_ErrorMessage)
return FAIL_RESTORE;
if (mode != DO_EVERYTHING && mode != DO_ONLY_CODE) {
return FAIL_RESTORE;
}
/* ignore info on stacks size */
*AHeap = get_header_cell();
if (Yap_ErrorMessage) {
return FAIL_RESTORE;
}
*AStack = get_header_cell();
if (Yap_ErrorMessage) {
return FAIL_RESTORE;
}
*ATrail = get_header_cell();
if (Yap_ErrorMessage) {
return FAIL_RESTORE;
}
/* now, check whether we got enough enough space to load the
saved space */
hp_size = get_cell();
if (Yap_ErrorMessage)
return FAIL_RESTORE;
while (Yap_HeapBase != NULL &&
hp_size > Unsigned(HeapLim) - Unsigned(Yap_HeapBase)) {
if(!Yap_growheap(FALSE, hp_size, NULL)) {
return FAIL_RESTORE;
}
}
if (mode == DO_EVERYTHING) {
lc_size = get_cell();
if (Yap_ErrorMessage)
return FAIL_RESTORE;
gb_size=get_cell();
if (Yap_ErrorMessage)
return FAIL_RESTORE;
if (Yap_HeapBase != NULL && lc_size+gb_size > Unsigned(Yap_LocalBase) - Unsigned(Yap_GlobalBase)) {
if (Yap_ErrorMessage != NULL)
Yap_ErrorMessage = "could not allocate enough stack space";
return FAIL_RESTORE;
}
if (Yap_HeapBase != NULL && (tr_size = get_cell()) > Unsigned(Yap_TrailTop) - Unsigned(Yap_TrailBase)) {
if (Yap_ErrorMessage != NULL)
Yap_ErrorMessage = "could not allocate enough trail space";
return FAIL_RESTORE;
}
} else {
/* skip cell size */
get_header_cell();
if (Yap_ErrorMessage)
return FAIL_RESTORE;
get_header_cell();
if (Yap_ErrorMessage)
return FAIL_RESTORE;
get_header_cell();
if (Yap_ErrorMessage)
return FAIL_RESTORE;
}
return(mode);
}
/* Gets the state of the heap, and evaluates the related variables */
static int
get_heap_info(void)
{
OldHeapBase = (ADDR) get_cellptr();
if (Yap_ErrorMessage)
return -1;
OldHeapTop = (ADDR) get_cellptr();
if (Yap_ErrorMessage)
return -1;
OldHeapUsed = (Int) get_cell();
if (Yap_ErrorMessage)
return -1;
FreeBlocks = (BlockHeader *) get_cellptr();
if (Yap_ErrorMessage)
return -1;
AuxSp = get_cellptr();
if (Yap_ErrorMessage)
return -1;
AuxTop = (ADDR)get_cellptr();
if (Yap_ErrorMessage)
return -1;
HDiff = Unsigned(Yap_HeapBase) - Unsigned(OldHeapBase);
return 1;
}
/* Gets the register array */
/* Saves the old bases for the work areas */
/* and evaluates the difference from the old areas to the new ones */
static int
get_regs(int flag)
{
CELL *NewGlobalBase = (CELL *)Yap_GlobalBase;
CELL *NewLCL0 = LCL0;
CELL *OldXREGS;
/* Get regs */
compile_arrays = (int)get_cell();
if (Yap_ErrorMessage)
return -1;
if (flag == DO_EVERYTHING) {
CP = (yamop *)get_cellptr();
if (Yap_ErrorMessage)
return -1;
ENV = get_cellptr();
if (Yap_ErrorMessage)
return -1;
ASP = get_cellptr();
if (Yap_ErrorMessage)
return -1;
/* N = get_cell(); */
H0 = get_cellptr();
if (Yap_ErrorMessage)
return -1;
LCL0 = get_cellptr();
if (Yap_ErrorMessage)
return -1;
H = get_cellptr();
if (Yap_ErrorMessage)
return -1;
HB = get_cellptr();
if (Yap_ErrorMessage)
return -1;
B = (choiceptr)get_cellptr();
if (Yap_ErrorMessage)
return -1;
TR = (tr_fr_ptr)get_cellptr();
if (Yap_ErrorMessage)
return -1;
YENV = get_cellptr();
if (Yap_ErrorMessage)
return -1;
S = get_cellptr();
if (Yap_ErrorMessage)
return -1;
P = (yamop *)get_cellptr();
if (Yap_ErrorMessage)
return -1;
CreepFlag = get_cell();
if (Yap_ErrorMessage)
return -1;
EX = get_cell();
if (Yap_ErrorMessage)
return -1;
#ifdef COROUTINING
DelayedVars = get_cell();
if (Yap_ErrorMessage)
return -1;
#endif
}
CurrentModule = get_cell();
if (Yap_ErrorMessage)
return -1;
if (flag == DO_EVERYTHING) {
#ifdef COROUTINING
WokenGoals = get_cell();
if (Yap_ErrorMessage)
return -1;
#endif
#ifdef DEPTH_LIMIT
DEPTH = get_cell();
if (Yap_ErrorMessage)
return -1;
#endif
GcGeneration = get_cell();
if (Yap_ErrorMessage)
return -1;
}
/* Get the old bases */
OldXREGS = get_cellptr();
if (Yap_ErrorMessage)
return -1;
which_save = get_cell();
if (Yap_ErrorMessage)
return -1;
XDiff = (CELL)XREGS - (CELL)OldXREGS;
if (Yap_ErrorMessage)
return -1;
if (get_heap_info() < 0)
return -1;
if (flag == DO_EVERYTHING) {
ARG1 = get_cell();
if (Yap_ErrorMessage)
return -1;
if (which_save == 2) {
ARG2 = get_cell();
if (Yap_ErrorMessage)
return -1;
}
/* get old trail base */
OldTrailBase = (ADDR)get_cellptr();
if (Yap_ErrorMessage)
return -1;
/* Save the old register where we can easily access them */
OldASP = ASP;
OldLCL0 = LCL0;
OldGlobalBase = (CELL *)Yap_GlobalBase;
OldH = H;
OldTR = TR;
GDiff = Unsigned(NewGlobalBase) - Unsigned(Yap_GlobalBase);
LDiff = Unsigned(NewLCL0) - Unsigned(LCL0);
TrDiff = LDiff;
Yap_GlobalBase = (ADDR)NewGlobalBase;
LCL0 = NewLCL0;
}
return 1;
}
/* Get the old opcodes and place them in a hash table */
static int
get_insts(OPCODE old_ops[])
{
return myread(splfild, (char *)old_ops, sizeof(OPCODE)*(_std_top+1));
}
/* Get the old atoms hash table */
static int
get_hash(void)
{
return myread(splfild, Yap_chtype , NUMBER_OF_CHARS);
}
/* Copy all of the old code to the new Heap */
static int
CopyCode(void)
{
#if defined(YAPOR) || defined(TABLING)
/* skip the local and global data structures */
CELL j = get_cell();
if (Yap_ErrorMessage)
return -1;
if (j != Unsigned(&GLOBAL) - Unsigned(Yap_HeapBase)) {
Yap_ErrorMessage = "code space size does not match saved state";
return -1;
}
if (myread(splfild, (char *) Yap_HeapBase, j) < 0)
return -1;
j = get_cell();
if (Yap_ErrorMessage)
return -1;
if (myread(splfild, (char *) &HashChain, j) < 0)
return -1;
#else
if (myread(splfild, (char *) Yap_HeapBase,
(Unsigned(OldHeapTop) - Unsigned(OldHeapBase))) < 0)
return -1;
#endif /* YAPOR || TABLING */
return 1;
}
/* Copy the local and global stack and also the trail to their new home */
/* In REGS we still have nonadjusted values !! */
static int
CopyStacks(void)
{
Int j;
char *NewASP;
j = Unsigned(OldLCL0) - Unsigned(ASP);
NewASP = (char *) (Unsigned(ASP) + (Unsigned(LCL0) - Unsigned(OldLCL0)));
if (myread(splfild, (char *) NewASP, j) < 0)
return -1;
j = Unsigned(H) - Unsigned(OldGlobalBase);
if (myread(splfild, (char *) Yap_GlobalBase, j) < 0)
return -1;
j = Unsigned(TR) - Unsigned(OldTrailBase);
if (myread(splfild, Yap_TrailBase, j))
return -1;
return 1;
}
/* Copy the local and global stack and also the trail to their new home */
/* In REGS we still have nonadjusted values !! */
static int
CopyTrailEntries(void)
{
CELL entry, *Entries;
Entries = (CELL *)Yap_TrailBase;
do {
*Entries++ = entry = get_cell();
if (Yap_ErrorMessage)
return -1;
} while ((CODEADDR)entry != NULL);
return 1;
}
/* get things which are saved in the file */
static int
get_coded(int flag, OPCODE old_ops[])
{
char my_end_msg[256];
if (get_regs(flag) < 0)
return -1;
if (get_insts(old_ops) < 0)
return -1;
if (get_hash() < 0)
return -1;
if (CopyCode() < 0)
return -1;
switch (flag) {
case DO_EVERYTHING:
if (CopyStacks() < 0)
return -1;
break;
case DO_ONLY_CODE:
if (CopyTrailEntries() < 0)
return -1;
break;
}
/* Check CRC */
if (myread(splfild, my_end_msg, 256) < 0)
return -1;
if (strcmp(end_msg,my_end_msg) != 0) {
Yap_ErrorMessage = "bad trailing CRC in saved state";
return -1;
}
return 1;
}
/* restore some heap registers */
static void
restore_heap_regs(void)
{
HeapTop = AddrAdjust(HeapTop);
*((YAP_SEG_SIZE *) HeapTop) = InUseFlag;
HeapMax = HeapUsed = OldHeapUsed;
restore_codes();
}
/* adjust abstract machine registers */
static void
restore_regs(int flag)
{
restore_heap_regs();
if (flag == DO_EVERYTHING) {
CP = PtoOpAdjust(CP);
ENV = PtoLocAdjust(ENV);
ASP = PtoLocAdjust(ASP);
H = PtoGloAdjust(H);
B = (choiceptr)PtoLocAdjust(CellPtr(B));
TR = PtoTRAdjust(TR);
P = PtoOpAdjust(P);
HB = PtoLocAdjust(HB);
YENV = PtoLocAdjust(YENV);
S = PtoGloAdjust(S);
if (EX)
EX = AbsAppl(PtoGloAdjust(RepAppl(EX)));
#ifdef COROUTINING
DelayedVars = AbsAppl(PtoGloAdjust(RepAppl(DelayedVars)));
#ifdef MULTI_ASSIGNMENT_VARIABLES
WokenGoals = AbsAppl(PtoGloAdjust(RepAppl(WokenGoals)));
#endif
#endif
}
}
static void
recompute_mask(DBRef dbr)
{
if (dbr->Flags & DBNoVars) {
dbr->Mask = Yap_EvalMasks((Term) dbr->DBT.Entry, &(dbr->Key));
} else if (dbr->Flags & DBComplex) {
/* This is quite nasty, we want to recalculate the mask but
we don't want to rebuild the whole term. We'll just build whatever we
need to recompute the mask.
*/
CELL *x = (CELL *)HeapTop, *tp;
unsigned int Arity, i;
Term out;
char *tbase = CharP(dbr->DBT.Contents-1);
if (IsPairTerm(dbr->DBT.Entry)) {
out = AbsPair(x);
Arity = 2;
tp = (CELL *)(tbase + (CELL) RepPair(dbr->DBT.Entry));
} else {
Functor f;
tp = (CELL *)(tbase + (CELL) RepAppl(dbr->DBT.Entry));
f = (Functor)(*tp++);
out = AbsAppl(x);
Arity = ArityOfFunctor(f);
*x++ = (CELL)f;
if (Arity > 3) Arity = 3;
}
for (i = 0; i < Arity; i++) {
register Term tw = *tp++;
if (IsVarTerm(tw)) {
RESET_VARIABLE(x);
} else if (IsApplTerm(tw)) {
/* just fetch the functor from where it is in the data-base.
This guarantees we have access to references and friends. */
CELL offset = (CELL)RepAppl(tw);
if (offset > dbr->DBT.NOfCells*sizeof(CELL))
*x = tw;
else
*x = AbsAppl((CELL *)(tbase + offset));
} else if (IsAtomicTerm(tw)) {
*x = tw;
} else if (IsPairTerm(tw)) {
*x = AbsPair(x);
}
x++;
}
dbr->Mask = Yap_EvalMasks(out, &(dbr->Key));
}
}
#define HASH_SHIFT 6
/*
* This is used to make an hash table correct, after displacing its elements,
* HCEnd should point to an area of free space, usually in the heap. The
* routine is very dependent on the hash function used, and it destroys the
* previous "hit" order
*/
static void
rehash(CELL *oldcode, int NOfE, int KindOfEntries)
{
register CELL *savep, *basep;
CELL *oldp = oldcode;
int TableSize = NOfE - 1, NOfEntries;
register int i;
int hash;
CELL WorkTerm, failplace = 0;
CELL *Base = oldcode;
if (HDiff == 0)
return;
basep = H;
if (H + (NOfE*2) > ASP) {
basep = (CELL *)TR;
if (basep + (NOfE*2) > (CELL *)Yap_TrailTop) {
if (!Yap_growtrail((ADDR)(basep + (NOfE*2))-Yap_TrailTop, TRUE)) {
Yap_Error(OUT_OF_TRAIL_ERROR, TermNil,
"not enough space to restore hash tables for indexing");
Yap_exit(1);
}
}
}
for (i = 0; i < NOfE; ++i) {
if (*oldp == 0) {
failplace = oldp[1];
break;
}
oldp += 2;
}
savep = basep;
oldp = oldcode;
for (i = 0; i < NOfE; ++i) {
if (*oldp != 0) {
savep[0] = oldp[0];
savep[1] = oldp[1];
oldp[0] = 0;
oldp[1] = failplace;
savep += 2;
}
oldp += 2;
}
NOfEntries = (savep - basep)/2;
savep = basep;
for (i = 0; i < NOfEntries; ++i) {
register Int d;
CELL *hentry;
WorkTerm = savep[i*2];
hash = (Unsigned(WorkTerm) >> HASH_SHIFT) & TableSize;
hentry = Base + hash * 2;
d = TableSize & (Unsigned(WorkTerm) | 1);
while (*hentry) {
#ifdef DEBUG
#ifdef CLASHES
++clashes;
#endif /* CLASHES */
#endif /* DEBUG */
hash = (hash + d) & TableSize;
hentry = Base + hash * 2;
}
hentry[0] = WorkTerm;
hentry[1] = savep[i*2+1];
}
}
#include "rheap.h"
/* restore the atom entries which are invisible for the user */
static void
RestoreForeignCodeStructure(void)
{
ForeignObj *f_code;
if (ForeignCodeLoaded != NULL)
ForeignCodeLoaded = (void *)AddrAdjust((ADDR)ForeignCodeLoaded);
f_code = ForeignCodeLoaded;
while (f_code != NULL) {
StringList objs, libs;
if (f_code->objs != NULL)
f_code->objs = (StringList)AddrAdjust((ADDR)f_code->objs);
objs = f_code->objs;
while (objs != NULL) {
if (objs->next != NULL)
objs->next = (StringList)AddrAdjust((ADDR)objs->next);
if (objs->s != NULL)
objs->s = (char *)AddrAdjust((ADDR)objs->s);
objs = objs->next;
}
if (f_code->libs != NULL)
f_code->libs = (StringList)AddrAdjust((ADDR)f_code->libs);
libs = f_code->libs;
while (libs != NULL) {
if (libs->next != NULL)
libs->next = (StringList)AddrAdjust((ADDR)libs->next);
if (libs->s != NULL)
libs->s = (char *)AddrAdjust((ADDR)libs->s);
libs = libs->next;
}
if (f_code->f != NULL)
f_code->f = (char *)AddrAdjust((ADDR)f_code->f);
if (f_code->next != NULL)
f_code->next = (ForeignObj *)AddrAdjust((ADDR)f_code->f);
f_code = f_code->next;
}
}
/* restore the atom entries which are invisible for the user */
static void
RestoreIOStructures(void)
{
Yap_InitStdStreams();
}
#if USE_DL_MALLOC
static struct malloc_chunk *
RestoreFreeChunk(struct malloc_chunk *ptr)
{
if (ptr->fd) {
ptr->fd = ChunkPtrAdjust(ptr->fd);
}
if (ptr->bk) {
ptr->bk = ChunkPtrAdjust(ptr->bk);
}
return ptr;
}
#endif
static void
RestoreFreeSpace(void)
{
#if USE_DL_MALLOC
int i;
Yap_av = (struct malloc_state *)AddrAdjust((ADDR)Yap_av);
for (i = 0; i < NFASTBINS; i++) {
if (Yap_av->fastbins[i]) {
struct malloc_chunk *ptr;
Yap_av->fastbins[i] = ptr = ChunkPtrAdjust(Yap_av->fastbins[i]);
while (ptr) {
ptr = RestoreFreeChunk(ptr)->fd;
}
}
}
if (Yap_av->top) {
Yap_av->top = ChunkPtrAdjust(Yap_av->top);
}
if (Yap_av->last_remainder) {
Yap_av->top = ChunkPtrAdjust(Yap_av->last_remainder);
}
for (i = 0; i < NBINS; i++) {
struct malloc_chunk *ptr;
if (Yap_av->bins[i*2]) {
Yap_av->bins[i*2] = ptr = ChunkPtrAdjust(Yap_av->bins[i*2]);
} else {
ptr = NULL;
}
if (Yap_av->bins[i*2+1]) {
Yap_av->bins[i*2+1] = ChunkPtrAdjust(Yap_av->bins[i*2+1]);
}
while (ptr && ptr != Yap_av->bins[i*2]) {
ptr = RestoreFreeChunk(ptr)->fd;
}
}
#else
/* restores the list of free space, with its curious structure */
register BlockHeader *bpt, *bsz;
if (FreeBlocks != NULL)
FreeBlocks = BlockAdjust(FreeBlocks);
bpt = FreeBlocks;
if (AuxSp != NULL)
AuxSp = CellPtoHeapAdjust(AuxSp);
if (AuxTop != NULL)
AuxTop = AddrAdjust(AuxTop);
while (bpt != NULL) {
if (bpt->b_next != NULL) {
bsz = bpt->b_next = BlockAdjust(bpt->b_next);
while (bsz != NULL) {
if (bsz->b_next_size != NULL)
bsz->b_next_size = BlockAdjust(bsz->b_next_size);
if (bsz->b_next != NULL)
bsz->b_next = BlockAdjust(bsz->b_next);
bsz = bsz->b_next;
}
}
if (bpt->b_next_size != NULL)
bpt->b_next_size = BlockAdjust(bpt->b_next_size);
bpt = bpt->b_next_size;
}
*((YAP_SEG_SIZE *) HeapTop) = InUseFlag;
#endif
}
/* restore the atom entries which are invisible for the user */
static void
RestoreInvisibleAtoms(void)
{
AtomEntry *at;
Atom atm = INVISIBLECHAIN.Entry;
INVISIBLECHAIN.Entry = atm = AtomAdjust(atm);
at = RepAtom(atm);
if (EndOfPAEntr(at))
return;
do {
#ifdef DEBUG_RESTORE2 /* useful during debug */
fprintf(errout, "Restoring %s\n", at->StrOfAE);
#endif
at->PropsOfAE = PropAdjust(at->PropsOfAE);
RestoreEntries(RepProp(at->PropsOfAE));
atm = at->NextOfAE;
at->NextOfAE = atm = AtomAdjust(atm);
at = RepAtom(atm);
}
while (!EndOfPAEntr(at));
}
/*
* This is the really tough part, to restore the whole of the heap
*/
static void
restore_heap(void)
{
AtomHashEntry *HashPtr = HashChain;
register int i;
for (i = 0; i < AtomHashTableSize; ++i) {
Atom atm = HashPtr->Entry;
if (atm) {
AtomEntry *at;
HashPtr->Entry = atm = AtomAdjust(atm);
at = RepAtom(atm);
do {
#ifdef DEBUG_RESTORE2 /* useful during debug */
fprintf(errout, "Restoring %s\n", at->StrOfAE);
#endif
at->PropsOfAE = PropAdjust(at->PropsOfAE);
RestoreEntries(RepProp(at->PropsOfAE));
atm = at->NextOfAE = AtomAdjust(at->NextOfAE);
at = RepAtom(atm);
} while (!EndOfPAEntr(at));
}
HashPtr++;
}
RestoreInvisibleAtoms();
RestoreForeignCodeStructure();
RestoreIOStructures();
}
#ifdef DEBUG_RESTORE3
static void
ShowEntries(pp)
PropEntry *pp;
{
while (!EndOfPAEntr(pp)) {
fprintf(Yap_stderr,"Estou a ver a prop %x em %x\n", pp->KindOfPE, pp);
pp = RepProp(pp->NextOfPE);
}
}
static void
ShowAtoms()
{
AtomHashEntry *HashPtr = HashChain;
register int i;
for (i = 0; i < AtomHashTableSize; ++i) {
if (HashPtr->Entry != NIL) {
AtomEntry *at;
at = RepAtom(HashPtr->Entry);
do {
fprintf(Yap_stderr,"Passei ao %s em %x\n", at->StrOfAE, at);
ShowEntries(RepProp(at->PropsOfAE));
} while (!EndOfPAEntr(at = RepAtom(at->NextOfAE)));
}
HashPtr++;
}
}
#endif /* DEBUG_RESTORE3 */
#include <stdio.h>
static int
commit_to_saved_state(char *s, CELL *Astate, CELL *ATrail, CELL *AStack, CELL *AHeap) {
int mode;
if ((mode = check_header(Astate,ATrail,AStack,AHeap)) == FAIL_RESTORE)
return(FAIL_RESTORE);
Yap_PrologMode = BootMode;
if (Yap_HeapBase) {
if (!yap_flags[HALT_AFTER_CONSULT_FLAG]) {
Yap_TrueFileName(s,Yap_FileNameBuf2, YAP_FILENAME_MAX);
fprintf(stderr, "%% Restoring file %s\n", Yap_FileNameBuf2);
}
Yap_CloseStreams(TRUE);
}
#ifdef DEBUG_RESTORE4
/*
* This should be another file, like the log file
*/
errout = Yap_stderr;
#endif
return(mode);
}
static void
cat_file_name(char *s, char *prefix, char *name, unsigned int max_length)
{
strncpy(s, prefix, max_length);
#if _MSC_VER || defined(__MINGW32__)
strncat(s,"\\", max_length);
#else
strncat(s,"/", max_length);
#endif
strncat(s, name, max_length);
}
static int
OpenRestore(char *inpf, char *YapLibDir, CELL *Astate, CELL *ATrail, CELL *AStack, CELL *AHeap)
{
int mode = FAIL_RESTORE;
Yap_ErrorMessage = NULL;
if (inpf == NULL)
inpf = StartUpFile;
#if __simplescalar__
/* does not implement getcwd */
strncpy(Yap_FileNameBuf,yap_pwd,YAP_FILENAME_MAX);
#elif HAVE_GETCWD
if (getcwd (Yap_FileNameBuf, YAP_FILENAME_MAX) == NULL)
Yap_FileNameBuf[0] = '\0';
#else
if (getwd (Yap_FileNameBuf) == NULL)
Yap_FileNameBuf[0] = '\0';
#endif
strncat(Yap_FileNameBuf, "/", YAP_FILENAME_MAX);
strncat(Yap_FileNameBuf, inpf, YAP_FILENAME_MAX);
if (inpf != NULL && (splfild = open_file(inpf, O_RDONLY)) > 0) {
if ((mode = commit_to_saved_state(inpf,Astate,ATrail,AStack,AHeap)) != FAIL_RESTORE) {
Yap_ErrorMessage = NULL;
return mode;
}
}
if (!Yap_dir_separator(inpf[0]) && !Yap_volume_header(inpf)) {
/*
we have a relative path for the file, try to do somewhat better
using YAPLIBDIR or friends.
*/
if (YapLibDir != NULL) {
cat_file_name(Yap_FileNameBuf, Yap_LibDir, inpf, YAP_FILENAME_MAX);
if ((splfild = open_file(Yap_FileNameBuf, O_RDONLY)) > 0) {
if ((mode = commit_to_saved_state(Yap_FileNameBuf,Astate,ATrail,AStack,AHeap)) != FAIL_RESTORE) {
Yap_ErrorMessage = NULL;
return mode;
}
}
}
#if HAVE_GETENV
{
char *yap_env = getenv("YAPLIBDIR");
if (yap_env != NULL) {
cat_file_name(Yap_FileNameBuf, yap_env, inpf, YAP_FILENAME_MAX);
if ((splfild = open_file(Yap_FileNameBuf, O_RDONLY)) > 0) {
if ((mode = commit_to_saved_state(Yap_FileNameBuf,Astate,ATrail,AStack,AHeap)) != FAIL_RESTORE) {
Yap_ErrorMessage = NULL;
return mode;
}
}
}
}
#endif
if (LIB_DIR != NULL) {
cat_file_name(Yap_FileNameBuf, LIB_DIR, inpf, YAP_FILENAME_MAX);
if ((splfild = open_file(Yap_FileNameBuf, O_RDONLY)) > 0) {
if ((mode = commit_to_saved_state(Yap_FileNameBuf,Astate,ATrail,AStack,AHeap)) != FAIL_RESTORE) {
Yap_ErrorMessage = NULL;
return(mode);
}
}
}
}
/* could not open file */
if (Yap_ErrorMessage == NULL) {
#if __simplescalar__
/* does not implement getcwd */
strncpy(Yap_FileNameBuf,yap_pwd,YAP_FILENAME_MAX);
#elif HAVE_GETCWD
if (getcwd (Yap_FileNameBuf, YAP_FILENAME_MAX) == NULL)
Yap_FileNameBuf[0] = '\0';
#else
if (getwd (Yap_FileNameBuf) == NULL)
Yap_FileNameBuf[0] = '\0';
#endif
strncat(Yap_FileNameBuf, "/", YAP_FILENAME_MAX);
strncat(Yap_FileNameBuf, inpf, YAP_FILENAME_MAX);
do_system_error(PERMISSION_ERROR_OPEN_SOURCE_SINK,"could not open saved state");
}
return FAIL_RESTORE;
}
static void
CloseRestore(void)
{
#ifdef DEBUG_RESTORE3
ShowAtoms();
#endif
close_file();
Yap_PrologMode = UserMode;
}
static int
check_opcodes(OPCODE old_ops[])
{
#if USE_THREADED_CODE
int have_shifted = FALSE;
op_numbers op = _Ystop;
for (op = _Ystop; op < _std_top; op++) {
if (Yap_opcode(op) != old_ops[op]) {
have_shifted = TRUE;
break;
}
}
return(have_shifted);
#else
return(FALSE);
#endif
}
static void
RestoreHeap(OPCODE old_ops[])
{
int heap_moved = (OldHeapBase != Yap_HeapBase), opcodes_moved;
Term mod = CurrentModule;
CurrentModule = PROLOG_MODULE;
opcodes_moved = check_opcodes(old_ops);
/* opcodes_moved has side-effects and should be tried first */
if (heap_moved || opcodes_moved) {
restore_heap();
}
/* This must be done after restore_heap */
if (heap_moved) {
RestoreFreeSpace();
}
Yap_InitAbsmi();
if (opcodes_moved) {
Yap_InitCPreds();
Yap_InitBackCPreds();
}
if (!(Yap_ReInitConstExps() &&
Yap_ReInitUnaryExps() &&
Yap_ReInitBinaryExps())) {
Yap_Error(SYSTEM_ERROR, TermNil, "arithmetic operator not in saved state");
}
#ifdef DEBUG_RESTORE1
fprintf(errout, "phase 1 done\n");
#endif
CurrentModule = mod;
}
/*
* This function is called to know about the parameters of the last saved
* state
*/
int
Yap_SavedInfo(char *FileName, char *YapLibDir, CELL *ATrail, CELL *AStack, CELL *AHeap)
{
CELL MyTrail, MyStack, MyHeap, MyState;
int mode;
mode = OpenRestore(FileName, YapLibDir, &MyState, &MyTrail, &MyStack, &MyHeap);
if (mode == FAIL_RESTORE) {
return -1;
}
close_file();
if (! *AHeap)
*AHeap = MyHeap / 1024;
if (mode != DO_ONLY_CODE && *AStack)
*AStack = MyStack / 1024;
if (mode != DO_ONLY_CODE && *ATrail)
*ATrail = MyTrail / 1024;
return (MyState);
}
static void
UnmarkTrEntries(void)
{
CELL entry, *Entries;
/* initialise a choice point */
B = (choiceptr)LCL0;
B--;
B->cp_ap = NOCODE;
Entries = (CELL *)Yap_TrailBase;
while ((entry = *Entries++) != (CELL)NULL) {
if (IsVarTerm(entry)) {
RESET_VARIABLE((CELL *)entry);
} else if (IsPairTerm(entry)) {
CELL *ent = CellPtoHeapAdjust(RepPair(entry));
register CELL flags;
flags = *ent;
ResetFlag(InUseMask, flags);
*ent = flags;
if (FlagOn(ErasedMask, flags)) {
if (FlagOn(DBClMask, flags)) {
Yap_ErDBE(DBStructFlagsToDBStruct(ent));
} else {
if (flags & LogUpdMask) {
if (flags & IndexMask) {
Yap_ErLogUpdIndex(ClauseFlagsToLogUpdIndex(ent), NULL);
} else {
Yap_ErLogUpdCl(ClauseFlagsToLogUpdClause(ent));
}
} else {
Yap_ErCl(ClauseFlagsToDynamicClause(ent));
}
}
}
#ifdef MULTI_ASSIGNMENT_VARIABLES
} else /* if (IsApplTerm(d1)) */ {
Entries += 2;
#endif
}
}
B = NULL;
}
int in_limbo = FALSE;
/*
* This function is called when wanting only to restore the heap and
* associated registers
*/
static int
Restore(char *s, char *lib_dir)
{
int restore_mode;
OPCODE old_ops[_std_top+1];
CELL MyTrail, MyStack, MyHeap, MyState;
if ((restore_mode = OpenRestore(s, lib_dir, &MyState, &MyTrail, &MyStack, &MyHeap)) == FAIL_RESTORE)
return(FALSE);
Yap_ShutdownLoadForeign();
in_limbo = TRUE;
if (get_coded(restore_mode, old_ops) < 0)
return FAIL_RESTORE;
restore_regs(restore_mode);
in_limbo = FALSE;
/*#endif*/
RestoreHeap(old_ops);
switch(restore_mode) {
case DO_EVERYTHING:
if (OldHeapBase != Yap_HeapBase ||
OldLCL0 != LCL0 ||
OldGlobalBase != (CELL *)Yap_GlobalBase ||
OldTrailBase != Yap_TrailBase) {
Yap_AdjustStacksAndTrail();
if (which_save == 2) {
Yap_AdjustRegs(2);
} else {
Yap_AdjustRegs(1);
}
break;
#ifdef DEBUG_RESTORE2
fprintf(errout, "phase 2 done\n");
#endif
}
break;
case DO_ONLY_CODE:
UnmarkTrEntries();
Yap_InitYaamRegs();
break;
}
Yap_ReOpenLoadForeign();
Yap_InitPlIO();
/* reset time */
Yap_ReInitWallTime();
CloseRestore();
if (which_save == 2) {
Yap_unify(ARG2, MkIntTerm(0));
}
return restore_mode;
}
int
Yap_Restore(char *s, char *lib_dir)
{
return Restore(s, lib_dir);
}
static Int
p_restore(void)
{
int mode;
Term t1 = Deref(ARG1);
#if defined(YAPOR) || defined(THREADS)
if (NOfThreads != 1) {
Yap_Error(SYSTEM_ERROR,TermNil,"cannot perform save: more than a worker/thread running");
return(FALSE);
}
#endif
if (!Yap_GetName(Yap_FileNameBuf, YAP_FILENAME_MAX, t1)) {
Yap_Error(TYPE_ERROR_LIST,t1,"restore/1");
return(FALSE);
}
if ((mode = Restore(Yap_FileNameBuf, NULL)) == DO_ONLY_CODE) {
#if PUSH_REGS
restore_absmi_regs(&Yap_standard_regs);
#endif
/* back to the top level we go */
siglongjmp(Yap_RestartEnv,3);
}
return(mode != FAIL_RESTORE);
}
void
Yap_InitSavePreds(void)
{
Yap_InitCPred("$save", 1, p_save, SafePredFlag|SyncPredFlag|HiddenPredFlag);
Yap_InitCPred("$save", 2, p_save2, SafePredFlag|SyncPredFlag|HiddenPredFlag);
Yap_InitCPred("$save_program", 1, p_save_program, SafePredFlag|SyncPredFlag|HiddenPredFlag);
Yap_InitCPred("$restore", 1, p_restore, SyncPredFlag|HiddenPredFlag);
}
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