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postgresql/src/backend/bootstrap/bootstrap.c

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/*-------------------------------------------------------------------------
*
* bootstrap.c
* routines to support running postgres in 'bootstrap' mode
* bootstrap mode is used to create the initial template database
*
* Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/bootstrap/bootstrap.c,v 1.104 2001/01/24 19:42:51 momjian Exp $
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include <unistd.h>
#include <time.h>
#include <signal.h>
#include <setjmp.h>
#define BOOTSTRAP_INCLUDE /* mask out stuff in tcop/tcopprot.h */
#ifdef HAVE_GETOPT_H
#include <getopt.h>
#endif
#include "access/genam.h"
#include "access/heapam.h"
#include "access/xlog.h"
#include "bootstrap/bootstrap.h"
#include "catalog/catname.h"
#include "catalog/index.h"
#include "catalog/pg_type.h"
#include "libpq/pqsignal.h"
#include "miscadmin.h"
#include "tcop/tcopprot.h"
#include "utils/builtins.h"
#include "utils/exc.h"
#include "utils/fmgroids.h"
#include "utils/guc.h"
#include "utils/lsyscache.h"
#include "utils/relcache.h"
#define ALLOC(t, c) ((t *) calloc((unsigned)(c), sizeof(t)))
extern int Int_yyparse(void);
static hashnode *AddStr(char *str, int strlength, int mderef);
static Form_pg_attribute AllocateAttribute(void);
static bool BootstrapAlreadySeen(Oid id);
static int CompHash(char *str, int len);
static hashnode *FindStr(char *str, int length, hashnode *mderef);
static Oid gettype(char *type);
static void cleanup(void);
/* ----------------
* global variables
* ----------------
*/
/*
* In the lexical analyzer, we need to get the reference number quickly from
* the string, and the string from the reference number. Thus we have
* as our data structure a hash table, where the hashing key taken from
* the particular string. The hash table is chained. One of the fields
* of the hash table node is an index into the array of character pointers.
* The unique index number that every string is assigned is simply the
* position of its string pointer in the array of string pointers.
*/
#define STRTABLESIZE 10000
#define HASHTABLESIZE 503
/* Hash function numbers */
#define NUM 23
#define NUMSQR 529
#define NUMCUBE 12167
char *strtable[STRTABLESIZE];
hashnode *hashtable[HASHTABLESIZE];
static int strtable_end = -1; /* Tells us last occupied string space */
/*-
* Basic information associated with each type. This is used before
* pg_type is created.
*
* XXX several of these input/output functions do catalog scans
* (e.g., F_REGPROCIN scans pg_proc). this obviously creates some
* order dependencies in the catalog creation process.
*/
struct typinfo
{
char name[NAMEDATALEN];
Oid oid;
Oid elem;
int16 len;
Oid inproc;
Oid outproc;
};
static struct typinfo Procid[] = {
{"bool", BOOLOID, 0, 1, F_BOOLIN, F_BOOLOUT},
{"bytea", BYTEAOID, 0, -1, F_BYTEAIN, F_BYTEAOUT},
{"char", CHAROID, 0, 1, F_CHARIN, F_CHAROUT},
{"name", NAMEOID, 0, NAMEDATALEN, F_NAMEIN, F_NAMEOUT},
{"int2", INT2OID, 0, 2, F_INT2IN, F_INT2OUT},
{"int2vector", INT2VECTOROID, 0, INDEX_MAX_KEYS * 2, F_INT2VECTORIN, F_INT2VECTOROUT},
{"int4", INT4OID, 0, 4, F_INT4IN, F_INT4OUT},
{"regproc", REGPROCOID, 0, 4, F_REGPROCIN, F_REGPROCOUT},
{"text", TEXTOID, 0, -1, F_TEXTIN, F_TEXTOUT},
{"oid", OIDOID, 0, 4, F_OIDIN, F_OIDOUT},
{"tid", TIDOID, 0, 6, F_TIDIN, F_TIDOUT},
{"xid", XIDOID, 0, 4, F_XIDIN, F_XIDOUT},
{"cid", CIDOID, 0, 4, F_CIDIN, F_CIDOUT},
{"oidvector", 30, 0, INDEX_MAX_KEYS * 4, F_OIDVECTORIN, F_OIDVECTOROUT},
{"smgr", 210, 0, 2, F_SMGRIN, F_SMGROUT},
{"_int4", 1007, INT4OID, -1, F_ARRAY_IN, F_ARRAY_OUT},
{"_aclitem", 1034, 1033, -1, F_ARRAY_IN, F_ARRAY_OUT}
};
static int n_types = sizeof(Procid) / sizeof(struct typinfo);
struct typmap
{ /* a hack */
Oid am_oid;
FormData_pg_type am_typ;
};
static struct typmap **Typ = (struct typmap **) NULL;
static struct typmap *Ap = (struct typmap *) NULL;
static int Warnings = 0;
static char Blanks[MAXATTR];
static char *relname; /* current relation name */
Form_pg_attribute attrtypes[MAXATTR]; /* points to attribute info */
static Datum values[MAXATTR]; /* corresponding attribute values */
int numattr; /* number of attributes for cur. rel */
int DebugMode;
static MemoryContext nogc = NULL; /* special no-gc mem context */
extern int optind;
extern char *optarg;
extern void SetRedoRecPtr(void);
/*
* At bootstrap time, we first declare all the indices to be built, and
* then build them. The IndexList structure stores enough information
* to allow us to build the indices after they've been declared.
*/
typedef struct _IndexList
{
char *il_heap;
char *il_ind;
IndexInfo *il_info;
struct _IndexList *il_next;
} IndexList;
static IndexList *ILHead = (IndexList *) NULL;
/* ----------------------------------------------------------------
* misc functions
* ----------------------------------------------------------------
*/
/* ----------------
* error handling / abort routines
* ----------------
*/
void
err_out(void)
{
Warnings++;
cleanup();
}
/* usage:
usage help for the bootstrap backen
*/
static void
usage(void)
{
fprintf(stderr, "Usage: postgres -boot [-d] [-C] [-F] [-O] [-Q] ");
fprintf(stderr, "[-P portno] [dbName]\n");
fprintf(stderr, " d: debug mode\n");
fprintf(stderr, " C: disable version checking\n");
fprintf(stderr, " F: turn off fsync\n");
fprintf(stderr, " O: set BootstrapProcessing mode\n");
fprintf(stderr, " P portno: specify port number\n");
proc_exit(1);
}
int
BootstrapMain(int argc, char *argv[])
/* ----------------------------------------------------------------
* The main loop for handling the backend in bootstrap mode
* the bootstrap mode is used to initialize the template database
* the bootstrap backend doesn't speak SQL, but instead expects
* commands in a special bootstrap language.
*
* The arguments passed in to BootstrapMain are the run-time arguments
* without the argument '-boot', the caller is required to have
* removed -boot from the run-time args
* ----------------------------------------------------------------
*/
{
int i;
char *dbName;
int flag;
int xlogop = BS_XLOG_NOP;
char *potential_DataDir = NULL;
/* --------------------
* initialize globals
* -------------------
*/
MyProcPid = getpid();
/*
* Fire up essential subsystems: error and memory management
*
* If we are running under the postmaster, this is done already.
*/
if (!IsUnderPostmaster)
{
EnableExceptionHandling(true);
MemoryContextInit();
}
/* ----------------
* process command arguments
* ----------------
*/
/* Set defaults, to be overriden by explicit options below */
Quiet = false;
Noversion = false;
dbName = NULL;
if (!IsUnderPostmaster)
{
ResetAllOptions();
potential_DataDir = getenv("PGDATA"); /* Null if no PGDATA variable */
}
while ((flag = getopt(argc, argv, "D:dCQx:pB:F")) != EOF)
{
switch (flag)
{
case 'D':
potential_DataDir = optarg;
break;
case 'd':
DebugMode = true; /* print out debugging info while
* parsing */
break;
case 'C':
Noversion = true;
break;
case 'F':
enableFsync = false;
break;
case 'Q':
Quiet = true;
break;
case 'x':
xlogop = atoi(optarg);
break;
case 'p':
/* indicates fork from postmaster */
break;
case 'B':
NBuffers = atoi(optarg);
break;
default:
usage();
break;
}
} /* while */
if (argc - optind > 1)
usage();
else if (argc - optind == 1)
dbName = argv[optind];
SetProcessingMode(BootstrapProcessing);
IgnoreSystemIndexes(true);
if (!IsUnderPostmaster)
{
if (!potential_DataDir)
{
fprintf(stderr, "%s does not know where to find the database system "
"data. You must specify the directory that contains the "
"database system either by specifying the -D invocation "
"option or by setting the PGDATA environment variable.\n\n",
argv[0]);
proc_exit(1);
}
SetDataDir(potential_DataDir);
}
Assert(DataDir);
if (dbName == NULL)
{
dbName = getenv("USER");
if (dbName == NULL)
{
fputs("bootstrap backend: failed, no db name specified\n", stderr);
fputs(" and no USER enviroment variable\n", stderr);
proc_exit(1);
}
}
XLOGPathInit();
BaseInit();
if (!IsUnderPostmaster)
{
pqsignal(SIGHUP, die);
pqsignal(SIGINT, die);
pqsignal(SIGTERM, die);
pqsignal(SIGQUIT, die);
}
/*
* XLOG operations
*/
SetProcessingMode(NormalProcessing);
if (xlogop == BS_XLOG_NOP)
StartupXLOG();
else if (xlogop == BS_XLOG_BOOTSTRAP)
{
BootStrapXLOG();
StartupXLOG();
}
else
{
if (xlogop == BS_XLOG_CHECKPOINT)
{
CreateDummyCaches();
CreateCheckPoint(false);
SetRedoRecPtr();
}
else if (xlogop == BS_XLOG_STARTUP)
StartupXLOG();
else if (xlogop == BS_XLOG_SHUTDOWN)
ShutdownXLOG();
else
elog(STOP, "Unsupported XLOG op %d", xlogop);
proc_exit(0);
}
SetProcessingMode(BootstrapProcessing);
/*
* backend initialization
*/
InitPostgres(dbName, NULL);
LockDisable(true);
for (i = 0; i < MAXATTR; i++)
{
attrtypes[i] = (Form_pg_attribute) NULL;
Blanks[i] = ' ';
}
for (i = 0; i < STRTABLESIZE; ++i)
strtable[i] = NULL;
for (i = 0; i < HASHTABLESIZE; ++i)
hashtable[i] = NULL;
/* ----------------
* abort processing resumes here
* ----------------
*/
if (sigsetjmp(Warn_restart, 1) != 0)
{
Warnings++;
AbortCurrentTransaction();
}
/* ----------------
* process input.
* ----------------
*/
/*
* the sed script boot.sed renamed yyparse to Int_yyparse for the
* bootstrap parser to avoid conflicts with the normal SQL parser
*/
Int_yyparse();
SetProcessingMode(NormalProcessing);
CreateCheckPoint(true);
SetProcessingMode(BootstrapProcessing);
/* clean up processing */
StartTransactionCommand();
cleanup();
/* not reached, here to make compiler happy */
return 0;
}
/* ----------------------------------------------------------------
* MANUAL BACKEND INTERACTIVE INTERFACE COMMANDS
* ----------------------------------------------------------------
*/
/* ----------------
* boot_openrel
* ----------------
*/
void
boot_openrel(char *relname)
{
int i;
struct typmap **app;
Relation rel;
HeapScanDesc scan;
HeapTuple tup;
if (strlen(relname) >= NAMEDATALEN - 1)
relname[NAMEDATALEN - 1] = '\0';
if (Typ == (struct typmap **) NULL)
{
rel = heap_openr(TypeRelationName, NoLock);
scan = heap_beginscan(rel, 0, SnapshotNow, 0, (ScanKey) NULL);
i = 0;
while (HeapTupleIsValid(tup = heap_getnext(scan, 0)))
++i;
heap_endscan(scan);
app = Typ = ALLOC(struct typmap *, i + 1);
while (i-- > 0)
*app++ = ALLOC(struct typmap, 1);
*app = (struct typmap *) NULL;
scan = heap_beginscan(rel, 0, SnapshotNow, 0, (ScanKey) NULL);
app = Typ;
while (HeapTupleIsValid(tup = heap_getnext(scan, 0)))
{
(*app)->am_oid = tup->t_data->t_oid;
memcpy((char *) &(*app)->am_typ,
(char *) GETSTRUCT(tup),
sizeof((*app)->am_typ));
app++;
}
heap_endscan(scan);
heap_close(rel, NoLock);
}
if (reldesc != NULL)
closerel(NULL);
if (!Quiet)
printf("Amopen: relation %s. attrsize %d\n", relname ? relname : "(null)",
(int) ATTRIBUTE_TUPLE_SIZE);
reldesc = heap_openr(relname, NoLock);
numattr = reldesc->rd_rel->relnatts;
for (i = 0; i < numattr; i++)
{
if (attrtypes[i] == NULL)
attrtypes[i] = AllocateAttribute();
memmove((char *) attrtypes[i],
(char *) reldesc->rd_att->attrs[i],
ATTRIBUTE_TUPLE_SIZE);
/* Some old pg_attribute tuples might not have attisset. */
/*
* If the attname is attisset, don't look for it - it may not be
* defined yet.
*/
if (namestrcmp(&attrtypes[i]->attname, "attisset") == 0)
attrtypes[i]->attisset = get_attisset(RelationGetRelid(reldesc),
NameStr(attrtypes[i]->attname));
else
attrtypes[i]->attisset = false;
if (DebugMode)
{
Form_pg_attribute at = attrtypes[i];
printf("create attribute %d name %s len %d num %d type %d\n",
i, NameStr(at->attname), at->attlen, at->attnum,
at->atttypid
);
fflush(stdout);
}
}
}
/* ----------------
* closerel
* ----------------
*/
void
closerel(char *name)
{
if (name)
{
if (reldesc)
{
if (strcmp(RelationGetRelationName(reldesc), name) != 0)
elog(ERROR, "closerel: close of '%s' when '%s' was expected",
name, relname ? relname : "(null)");
}
else
elog(ERROR, "closerel: close of '%s' before any relation was opened",
name);
}
if (reldesc == NULL)
elog(ERROR, "Warning: no opened relation to close.\n");
else
{
if (!Quiet)
printf("Amclose: relation %s.\n", relname ? relname : "(null)");
heap_close(reldesc, NoLock);
reldesc = (Relation) NULL;
}
}
/* ----------------
* DEFINEATTR()
*
* define a <field,type> pair
* if there are n fields in a relation to be created, this routine
* will be called n times
* ----------------
*/
void
DefineAttr(char *name, char *type, int attnum)
{
int attlen;
Oid typeoid;
if (reldesc != NULL)
{
fputs("Warning: no open relations allowed with 't' command.\n", stderr);
closerel(relname);
}
typeoid = gettype(type);
if (attrtypes[attnum] == (Form_pg_attribute) NULL)
attrtypes[attnum] = AllocateAttribute();
if (Typ != (struct typmap **) NULL)
{
attrtypes[attnum]->atttypid = Ap->am_oid;
namestrcpy(&attrtypes[attnum]->attname, name);
if (!Quiet)
printf("<%s %s> ", NameStr(attrtypes[attnum]->attname), type);
attrtypes[attnum]->attnum = 1 + attnum; /* fillatt */
attlen = attrtypes[attnum]->attlen = Ap->am_typ.typlen;
attrtypes[attnum]->attbyval = Ap->am_typ.typbyval;
attrtypes[attnum]->attstorage = Ap->am_typ.typstorage;;
attrtypes[attnum]->attalign = Ap->am_typ.typalign;
}
else
{
attrtypes[attnum]->atttypid = Procid[typeoid].oid;
namestrcpy(&attrtypes[attnum]->attname, name);
if (!Quiet)
printf("<%s %s> ", NameStr(attrtypes[attnum]->attname), type);
attrtypes[attnum]->attnum = 1 + attnum; /* fillatt */
attlen = attrtypes[attnum]->attlen = Procid[typeoid].len;
attrtypes[attnum]->attstorage = 'p';
/*
* Cheat like mad to fill in these items from the length only.
* This only has to work for types used in the system catalogs...
*/
switch (attlen)
{
case 1:
attrtypes[attnum]->attbyval = true;
attrtypes[attnum]->attalign = 'c';
break;
case 2:
attrtypes[attnum]->attbyval = true;
attrtypes[attnum]->attalign = 's';
break;
case 4:
attrtypes[attnum]->attbyval = true;
attrtypes[attnum]->attalign = 'i';
break;
default:
attrtypes[attnum]->attbyval = false;
attrtypes[attnum]->attalign = 'i';
break;
}
}
attrtypes[attnum]->attcacheoff = -1;
attrtypes[attnum]->atttypmod = -1;
}
/* ----------------
* InsertOneTuple
* assumes that 'oid' will not be zero.
* ----------------
*/
void
InsertOneTuple(Oid objectid)
{
HeapTuple tuple;
TupleDesc tupDesc;
int i;
if (DebugMode)
{
printf("InsertOneTuple oid %u, %d attrs\n", objectid, numattr);
fflush(stdout);
}
tupDesc = CreateTupleDesc(numattr, attrtypes);
tuple = heap_formtuple(tupDesc, values, Blanks);
pfree(tupDesc); /* just free's tupDesc, not the attrtypes */
if (objectid != (Oid) 0)
tuple->t_data->t_oid = objectid;
heap_insert(reldesc, tuple);
heap_freetuple(tuple);
if (DebugMode)
{
printf("End InsertOneTuple, objectid=%u\n", objectid);
fflush(stdout);
}
/*
* Reset blanks for next tuple
*/
for (i = 0; i < numattr; i++)
Blanks[i] = ' ';
}
/* ----------------
* InsertOneValue
* ----------------
*/
void
InsertOneValue(Oid objectid, char *value, int i)
{
int typeindex;
char *prt;
struct typmap **app;
if (DebugMode)
printf("Inserting value: '%s'\n", value);
if (i < 0 || i >= MAXATTR)
{
printf("i out of range: %d\n", i);
Assert(0);
}
if (Typ != (struct typmap **) NULL)
{
struct typmap *ap;
if (DebugMode)
puts("Typ != NULL");
app = Typ;
while (*app && (*app)->am_oid != reldesc->rd_att->attrs[i]->atttypid)
++app;
ap = *app;
if (ap == NULL)
{
printf("Unable to find atttypid in Typ list! %u\n",
reldesc->rd_att->attrs[i]->atttypid
);
Assert(0);
}
values[i] = OidFunctionCall3(ap->am_typ.typinput,
CStringGetDatum(value),
ObjectIdGetDatum(ap->am_typ.typelem),
Int32GetDatum(-1));
prt = DatumGetCString(OidFunctionCall3(ap->am_typ.typoutput,
values[i],
ObjectIdGetDatum(ap->am_typ.typelem),
Int32GetDatum(-1)));
if (!Quiet)
printf("%s ", prt);
pfree(prt);
}
else
{
for (typeindex = 0; typeindex < n_types; typeindex++)
{
if (Procid[typeindex].oid == attrtypes[i]->atttypid)
break;
}
if (typeindex >= n_types)
elog(ERROR, "can't find type OID %u", attrtypes[i]->atttypid);
if (DebugMode)
printf("Typ == NULL, typeindex = %u idx = %d\n", typeindex, i);
values[i] = OidFunctionCall3(Procid[typeindex].inproc,
CStringGetDatum(value),
ObjectIdGetDatum(Procid[typeindex].elem),
Int32GetDatum(-1));
prt = DatumGetCString(OidFunctionCall3(Procid[typeindex].outproc,
values[i],
ObjectIdGetDatum(Procid[typeindex].elem),
Int32GetDatum(-1)));
if (!Quiet)
printf("%s ", prt);
pfree(prt);
}
if (DebugMode)
{
puts("End InsertValue");
fflush(stdout);
}
}
/* ----------------
* InsertOneNull
* ----------------
*/
void
InsertOneNull(int i)
{
if (DebugMode)
printf("Inserting null\n");
if (i < 0 || i >= MAXATTR)
elog(FATAL, "i out of range (too many attrs): %d\n", i);
values[i] = PointerGetDatum(NULL);
Blanks[i] = 'n';
}
#define MORE_THAN_THE_NUMBER_OF_CATALOGS 256
static bool
BootstrapAlreadySeen(Oid id)
{
static Oid seenArray[MORE_THAN_THE_NUMBER_OF_CATALOGS];
static int nseen = 0;
bool seenthis;
int i;
seenthis = false;
for (i = 0; i < nseen; i++)
{
if (seenArray[i] == id)
{
seenthis = true;
break;
}
}
if (!seenthis)
{
seenArray[nseen] = id;
nseen++;
}
return seenthis;
}
/* ----------------
* cleanup
* ----------------
*/
static void
cleanup()
{
static int beenhere = 0;
if (!beenhere)
beenhere = 1;
else
{
elog(FATAL, "Memory manager fault: cleanup called twice.\n");
proc_exit(1);
}
if (reldesc != (Relation) NULL)
heap_close(reldesc, NoLock);
CommitTransactionCommand();
proc_exit(Warnings);
}
/* ----------------
* gettype
* ----------------
*/
static Oid
gettype(char *type)
{
int i;
Relation rel;
HeapScanDesc scan;
HeapTuple tup;
struct typmap **app;
if (Typ != (struct typmap **) NULL)
{
for (app = Typ; *app != (struct typmap *) NULL; app++)
{
if (strncmp(NameStr((*app)->am_typ.typname), type, NAMEDATALEN) == 0)
{
Ap = *app;
return (*app)->am_oid;
}
}
}
else
{
for (i = 0; i <= n_types; i++)
{
if (strncmp(type, Procid[i].name, NAMEDATALEN) == 0)
return i;
}
if (DebugMode)
printf("bootstrap.c: External Type: %s\n", type);
rel = heap_openr(TypeRelationName, NoLock);
scan = heap_beginscan(rel, 0, SnapshotNow, 0, (ScanKey) NULL);
i = 0;
while (HeapTupleIsValid(tup = heap_getnext(scan, 0)))
++i;
heap_endscan(scan);
app = Typ = ALLOC(struct typmap *, i + 1);
while (i-- > 0)
*app++ = ALLOC(struct typmap, 1);
*app = (struct typmap *) NULL;
scan = heap_beginscan(rel, 0, SnapshotNow, 0, (ScanKey) NULL);
app = Typ;
while (HeapTupleIsValid(tup = heap_getnext(scan, 0)))
{
(*app)->am_oid = tup->t_data->t_oid;
memmove((char *) &(*app++)->am_typ,
(char *) GETSTRUCT(tup),
sizeof((*app)->am_typ));
}
heap_endscan(scan);
heap_close(rel, NoLock);
return gettype(type);
}
elog(ERROR, "Error: unknown type '%s'.\n", type);
err_out();
/* not reached, here to make compiler happy */
return 0;
}
/* ----------------
* AllocateAttribute
* ----------------
*/
static Form_pg_attribute /* XXX */
AllocateAttribute()
{
Form_pg_attribute attribute = (Form_pg_attribute) malloc(ATTRIBUTE_TUPLE_SIZE);
if (!PointerIsValid(attribute))
elog(FATAL, "AllocateAttribute: malloc failed");
MemSet(attribute, 0, ATTRIBUTE_TUPLE_SIZE);
return attribute;
}
/* ----------------
* MapArrayTypeName
* XXX arrays of "basetype" are always "_basetype".
* this is an evil hack inherited from rel. 3.1.
* XXX array dimension is thrown away because we
* don't support fixed-dimension arrays. again,
* sickness from 3.1.
*
* the string passed in must have a '[' character in it
*
* the string returned is a pointer to static storage and should NOT
* be freed by the CALLER.
* ----------------
*/
char *
MapArrayTypeName(char *s)
{
int i,
j;
static char newStr[NAMEDATALEN]; /* array type names < NAMEDATALEN
* long */
if (s == NULL || s[0] == '\0')
return s;
j = 1;
newStr[0] = '_';
for (i = 0; i < NAMEDATALEN - 1 && s[i] != '['; i++, j++)
newStr[j] = s[i];
newStr[j] = '\0';
return newStr;
}
/* ----------------
* EnterString
* returns the string table position of the identifier
* passed to it. We add it to the table if we can't find it.
* ----------------
*/
int
EnterString(char *str)
{
hashnode *node;
int len;
len = strlen(str);
node = FindStr(str, len, 0);
if (node)
return node->strnum;
else
{
node = AddStr(str, len, 0);
return node->strnum;
}
}
/* ----------------
* LexIDStr
* when given an idnum into the 'string-table' return the string
* associated with the idnum
* ----------------
*/
char *
LexIDStr(int ident_num)
{
return strtable[ident_num];
}
/* ----------------
* CompHash
*
* Compute a hash function for a given string. We look at the first,
* the last, and the middle character of a string to try to get spread
* the strings out. The function is rather arbitrary, except that we
* are mod'ing by a prime number.
* ----------------
*/
static int
CompHash(char *str, int len)
{
int result;
result = (NUM * str[0] + NUMSQR * str[len - 1] + NUMCUBE * str[(len - 1) / 2]);
return result % HASHTABLESIZE;
}
/* ----------------
* FindStr
*
* This routine looks for the specified string in the hash
* table. It returns a pointer to the hash node found,
* or NULL if the string is not in the table.
* ----------------
*/
static hashnode *
FindStr(char *str, int length, hashnode *mderef)
{
hashnode *node;
node = hashtable[CompHash(str, length)];
while (node != NULL)
{
/*
* We must differentiate between string constants that might have
* the same value as a identifier and the identifier itself.
*/
if (!strcmp(str, strtable[node->strnum]))
{
return node; /* no need to check */
}
else
node = node->next;
}
/* Couldn't find it in the list */
return NULL;
}
/* ----------------
* AddStr
*
* This function adds the specified string, along with its associated
* data, to the hash table and the string table. We return the node
* so that the calling routine can find out the unique id that AddStr
* has assigned to this string.
* ----------------
*/
static hashnode *
AddStr(char *str, int strlength, int mderef)
{
hashnode *temp,
*trail,
*newnode;
int hashresult;
int len;
if (++strtable_end == STRTABLESIZE)
{
/* Error, string table overflow, so we Punt */
elog(FATAL,
"There are too many string constants and identifiers for the compiler to handle.");
}
/*
* Some of the utilites (eg, define type, create relation) assume that
* the string they're passed is a NAMEDATALEN. We get array bound
* read violations from purify if we don't allocate at least
* NAMEDATALEN bytes for strings of this sort. Because we're lazy, we
* allocate at least NAMEDATALEN bytes all the time.
*/
if ((len = strlength + 1) < NAMEDATALEN)
len = NAMEDATALEN;
strtable[strtable_end] = malloc((unsigned) len);
strcpy(strtable[strtable_end], str);
/* Now put a node in the hash table */
newnode = (hashnode *) malloc(sizeof(hashnode) * 1);
newnode->strnum = strtable_end;
newnode->next = NULL;
/* Find out where it goes */
hashresult = CompHash(str, strlength);
if (hashtable[hashresult] == NULL)
hashtable[hashresult] = newnode;
else
{ /* There is something in the list */
trail = hashtable[hashresult];
temp = trail->next;
while (temp != NULL)
{
trail = temp;
temp = temp->next;
}
trail->next = newnode;
}
return newnode;
}
/*
* index_register() -- record an index that has been set up for building
* later.
*
* At bootstrap time, we define a bunch of indices on system catalogs.
* We postpone actually building the indices until just before we're
* finished with initialization, however. This is because more classes
* and indices may be defined, and we want to be sure that all of them
* are present in the index.
*/
void
index_register(char *heap,
char *ind,
IndexInfo *indexInfo)
{
IndexList *newind;
MemoryContext oldcxt;
/*
* XXX mao 10/31/92 -- don't gc index reldescs, associated info at
* bootstrap time. we'll declare the indices now, but want to create
* them later.
*/
if (nogc == NULL)
nogc = AllocSetContextCreate((MemoryContext) NULL,
"BootstrapNoGC",
ALLOCSET_DEFAULT_MINSIZE,
ALLOCSET_DEFAULT_INITSIZE,
ALLOCSET_DEFAULT_MAXSIZE);
oldcxt = MemoryContextSwitchTo(nogc);
newind = (IndexList *) palloc(sizeof(IndexList));
newind->il_heap = pstrdup(heap);
newind->il_ind = pstrdup(ind);
newind->il_info = (IndexInfo *) palloc(sizeof(IndexInfo));
memcpy(newind->il_info, indexInfo, sizeof(IndexInfo));
/* predicate will likely be null anyway, but may as well copy it */
newind->il_info->ii_Predicate = copyObject(indexInfo->ii_Predicate);
newind->il_next = ILHead;
ILHead = newind;
MemoryContextSwitchTo(oldcxt);
}
void
build_indices()
{
for (; ILHead != (IndexList *) NULL; ILHead = ILHead->il_next)
{
Relation heap;
Relation ind;
heap = heap_openr(ILHead->il_heap, NoLock);
ind = index_openr(ILHead->il_ind);
index_build(heap, ind, ILHead->il_info, NULL);
/*
* In normal processing mode, index_build would close the heap and
* index, but in bootstrap mode it will not.
*/
/*
* All of the rest of this routine is needed only because in
* bootstrap processing we don't increment xact id's. The normal
* DefineIndex code replaces a pg_class tuple with updated info
* including the relhasindex flag (which we need to have updated).
* Unfortunately, there are always two indices defined on each
* catalog causing us to update the same pg_class tuple twice for
* each catalog getting an index during bootstrap resulting in the
* ghost tuple problem (see heap_update). To get around this we
* change the relhasindex field ourselves in this routine keeping
* track of what catalogs we already changed so that we don't
* modify those tuples twice. The normal mechanism for updating
* pg_class is disabled during bootstrap.
*
* -mer
*/
if (!BootstrapAlreadySeen(RelationGetRelid(heap)))
UpdateStats(RelationGetRelid(heap), 0);
/* XXX Probably we ought to close the heap and index here? */
}
}
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