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postgresql/src/backend/commands/define.c

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/*-------------------------------------------------------------------------
*
* define.c
*
* These routines execute some of the CREATE statements. In an earlier
* version of Postgres, these were "define" statements.
*
* Copyright (c) 1994, Regents of the University of California
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/commands/define.c,v 1.32 1999/07/16 03:12:48 momjian Exp $
*
* DESCRIPTION
* The "DefineFoo" routines take the parse tree and pick out the
* appropriate arguments/flags, passing the results to the
* corresponding "FooDefine" routines (in src/catalog) that do
* the actual catalog-munging. These routines also verify permission
* of the user to execute the command.
*
* NOTES
* These things must be defined and committed in the following order:
* "create function":
* input/output, recv/send procedures
* "create type":
* type
* "create operator":
* operators
*
* Most of the parse-tree manipulation routines are defined in
* commands/manip.c.
*
*-------------------------------------------------------------------------
*/
#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include <math.h>
#include "postgres.h"
#include "access/heapam.h"
#include "catalog/catname.h"
#include "catalog/pg_aggregate.h"
#include "catalog/pg_operator.h"
#include "catalog/pg_proc.h"
#include "catalog/pg_type.h"
#include "catalog/pg_language.h"
#include "utils/syscache.h"
#include "fmgr.h"
#include "utils/builtins.h"
#include "commands/defrem.h"
#include "tcop/dest.h"
#include "catalog/pg_shadow.h"
#include "optimizer/cost.h"
static char *defGetString(DefElem *def);
static int defGetTypeLength(DefElem *def);
#define DEFAULT_TYPDELIM ','
static void
case_translate_language_name(const char *input, char *output)
{
/*-------------------------------------------------------------------------
Translate the input language name to lower case, except if it's C,
translate to upper case.
--------------------------------------------------------------------------*/
int i;
for (i = 0; i < NAMEDATALEN && input[i]; ++i)
output[i] = tolower(input[i]);
output[i] = '\0';
if (strcmp(output, "c") == 0)
output[0] = 'C';
}
static void
compute_return_type(const Node *returnType,
char **prorettype_p, bool *returnsSet_p)
{
/*---------------------------------------------------------------------------
Examine the "returns" clause returnType of the CREATE FUNCTION statement
and return information about it as **prorettype_p and **returnsSet.
----------------------------------------------------------------------------*/
if (nodeTag(returnType) == T_TypeName)
{
/* a set of values */
TypeName *setType = (TypeName *) returnType;
*prorettype_p = setType->name;
*returnsSet_p = setType->setof;
}
else
{
/* singleton */
*prorettype_p = strVal(returnType);
*returnsSet_p = false;
}
}
static void
compute_full_attributes(const List *parameters, int32 *byte_pct_p,
int32 *perbyte_cpu_p, int32 *percall_cpu_p,
int32 *outin_ratio_p, bool *canCache_p)
{
/*--------------------------------------------------------------------------
Interpret the parameters *parameters and return their contents as
*byte_pct_p, etc.
These are the full parameters of a C or internal function.
---------------------------------------------------------------------------*/
List *pl;
/* the defaults */
*byte_pct_p = BYTE_PCT;
*perbyte_cpu_p = PERBYTE_CPU;
*percall_cpu_p = PERCALL_CPU;
*outin_ratio_p = OUTIN_RATIO;
foreach(pl, (List *) parameters)
{
ParamString *param = (ParamString *) lfirst(pl);
if (strcasecmp(param->name, "iscachable") == 0)
*canCache_p = true;
else if (strcasecmp(param->name, "trusted") == 0)
{
/*
* we don't have untrusted functions any more. The 4.2
* implementation is lousy anyway so I took it out. -ay 10/94
*/
elog(ERROR, "untrusted function has been decommissioned.");
}
else if (strcasecmp(param->name, "byte_pct") == 0)
{
/*
* * handle expensive function parameters
*/
*byte_pct_p = atoi(param->val);
}
else if (strcasecmp(param->name, "perbyte_cpu") == 0)
{
if (sscanf(param->val, "%d", perbyte_cpu_p) == 0)
{
int count;
char *ptr;
for (count = 0, ptr = param->val; *ptr != '\0'; ptr++)
if (*ptr == '!')
count++;
*perbyte_cpu_p = (int) pow(10.0, (double) count);
}
}
else if (strcasecmp(param->name, "percall_cpu") == 0)
{
if (sscanf(param->val, "%d", percall_cpu_p) == 0)
{
int count;
char *ptr;
for (count = 0, ptr = param->val; *ptr != '\0'; ptr++)
if (*ptr == '!')
count++;
*percall_cpu_p = (int) pow(10.0, (double) count);
}
}
else if (strcasecmp(param->name, "outin_ratio") == 0)
*outin_ratio_p = atoi(param->val);
}
}
static void
interpret_AS_clause(const char *languageName, const char *as,
char **prosrc_str_p, char **probin_str_p)
{
if (strcmp(languageName, "C") == 0)
{
/* For "C" language, store the given string in probin */
*prosrc_str_p = "-";
*probin_str_p = (char *) as;
}
else
{
/* Everything else wants the given string in prosrc */
*prosrc_str_p = (char *) as;
*probin_str_p = "-";
}
}
/*
* CreateFunction
* Execute a CREATE FUNCTION utility statement.
*
*/
void
CreateFunction(ProcedureStmt *stmt, CommandDest dest)
{
char *probin_str;
/* pathname of executable file that executes this function, if any */
char *prosrc_str;
/* SQL that executes this function, if any */
char *prorettype;
/* Type of return value (or member of set of values) from function */
char languageName[NAMEDATALEN];
/*
* name of language of function, with case adjusted: "C", "internal",
* or "SQL"
*/
/*
* The following are attributes of the function, as expressed in the
* CREATE FUNCTION statement, where applicable.
*/
int32 byte_pct,
perbyte_cpu,
percall_cpu,
outin_ratio;
bool canCache;
bool returnsSet;
bool lanisPL = false;
/* The function returns a set of values, as opposed to a singleton. */
case_translate_language_name(stmt->language, languageName);
compute_return_type(stmt->returnType, &prorettype, &returnsSet);
if (strcmp(languageName, "C") == 0 ||
strcmp(languageName, "internal") == 0)
{
compute_full_attributes(stmt->withClause,
&byte_pct, &perbyte_cpu, &percall_cpu,
&outin_ratio, &canCache);
}
else if (strcmp(languageName, "sql") == 0)
{
/* query optimizer groks sql, these are meaningless */
perbyte_cpu = percall_cpu = 0;
byte_pct = outin_ratio = 100;
canCache = false;
}
else
{
HeapTuple languageTuple;
Form_pg_language languageStruct;
/* Lookup the language in the system cache */
languageTuple = SearchSysCacheTuple(LANNAME,
PointerGetDatum(languageName),
0, 0, 0);
if (!HeapTupleIsValid(languageTuple))
{
elog(ERROR,
"Unrecognized language specified in a CREATE FUNCTION: "
"'%s'. Recognized languages are sql, C, internal "
"and the created procedural languages.",
languageName);
}
/* Check that this language is a PL */
languageStruct = (Form_pg_language) GETSTRUCT(languageTuple);
if (!(languageStruct->lanispl))
{
elog(ERROR,
"Language '%s' isn't defined as PL", languageName);
}
/*
* Functions in untrusted procedural languages are restricted to
* be defined by postgres superusers only
*/
if (languageStruct->lanpltrusted == false && !superuser())
{
elog(ERROR, "Only users with Postgres superuser privilege "
"are permitted to create a function in the '%s' "
"language.",
languageName);
}
lanisPL = true;
/*
* These are meaningless
*/
perbyte_cpu = percall_cpu = 0;
byte_pct = outin_ratio = 100;
canCache = false;
}
interpret_AS_clause(languageName, stmt->as, &prosrc_str, &probin_str);
if (strcmp(languageName, "sql") != 0 && lanisPL == false && !superuser())
elog(ERROR,
"Only users with Postgres superuser privilege are permitted "
"to create a function "
"in the '%s' language. Others may use the 'sql' language "
"or the created procedural languages.",
languageName);
/* Above does not return. */
else
{
/*
* And now that we have all the parameters, and know we're
* permitted to do so, go ahead and create the function.
*/
ProcedureCreate(stmt->funcname,
returnsSet,
prorettype,
languageName,
prosrc_str, /* converted to text later */
probin_str, /* converted to text later */
canCache,
true, /* (obsolete "trusted") */
byte_pct,
perbyte_cpu,
percall_cpu,
outin_ratio,
stmt->defArgs,
dest);
}
}
/* --------------------------------
* DefineOperator
*
* this function extracts all the information from the
* parameter list generated by the parser and then has
* OperatorCreate() do all the actual work.
*
* 'parameters' is a list of DefElem
* --------------------------------
*/
void
DefineOperator(char *oprName,
List *parameters)
{
uint16 precedence = 0; /* operator precedence */
bool canHash = false;/* operator hashes */
bool isLeftAssociative = true; /* operator is left
* associative */
char *functionName = NULL; /* function for operator */
char *typeName1 = NULL; /* first type name */
char *typeName2 = NULL; /* second type name */
char *commutatorName = NULL; /* optional commutator operator
* name */
char *negatorName = NULL; /* optional negator operator name */
char *restrictionName = NULL; /* optional restrict. sel.
* procedure */
char *joinName = NULL;/* optional join sel. procedure name */
char *sortName1 = NULL; /* optional first sort operator */
char *sortName2 = NULL; /* optional second sort operator */
List *pl;
/*
* loop over the definition list and extract the information we need.
*/
foreach(pl, parameters)
{
DefElem *defel = (DefElem *) lfirst(pl);
if (!strcasecmp(defel->defname, "leftarg"))
{
/* see gram.y, must be setof */
if (nodeTag(defel->arg) == T_TypeName)
elog(ERROR, "setof type not implemented for leftarg");
if (nodeTag(defel->arg) == T_String)
typeName1 = defGetString(defel);
else
elog(ERROR, "type for leftarg is malformed.");
}
else if (!strcasecmp(defel->defname, "rightarg"))
{
/* see gram.y, must be setof */
if (nodeTag(defel->arg) == T_TypeName)
elog(ERROR, "setof type not implemented for rightarg");
if (nodeTag(defel->arg) == T_String)
typeName2 = defGetString(defel);
else
elog(ERROR, "type for rightarg is malformed.");
}
else if (!strcasecmp(defel->defname, "procedure"))
functionName = defGetString(defel);
else if (!strcasecmp(defel->defname, "precedence"))
{
/* NOT IMPLEMENTED (never worked in v4.2) */
elog(NOTICE, "CREATE OPERATOR: precedence not implemented");
}
else if (!strcasecmp(defel->defname, "associativity"))
{
/* NOT IMPLEMENTED (never worked in v4.2) */
elog(NOTICE, "CREATE OPERATOR: associativity not implemented");
}
else if (!strcasecmp(defel->defname, "commutator"))
commutatorName = defGetString(defel);
else if (!strcasecmp(defel->defname, "negator"))
negatorName = defGetString(defel);
else if (!strcasecmp(defel->defname, "restrict"))
restrictionName = defGetString(defel);
else if (!strcasecmp(defel->defname, "join"))
joinName = defGetString(defel);
else if (!strcasecmp(defel->defname, "hashes"))
canHash = TRUE;
else if (!strcasecmp(defel->defname, "sort1"))
{
/* ----------------
* XXX ( ... [ , sort1 = oprname ] [ , sort2 = oprname ] ... )
* XXX is undocumented in the reference manual source as of
* 89/8/22.
* ----------------
*/
sortName1 = defGetString(defel);
}
else if (!strcasecmp(defel->defname, "sort2"))
sortName2 = defGetString(defel);
else
{
elog(NOTICE, "DefineOperator: attribute \"%s\" not recognized",
defel->defname);
}
}
/*
* make sure we have our required definitions
*/
if (functionName == NULL)
elog(ERROR, "Define: \"procedure\" unspecified");
/* ----------------
* now have OperatorCreate do all the work..
* ----------------
*/
OperatorCreate(oprName, /* operator name */
typeName1, /* first type name */
typeName2, /* second type name */
functionName,/* function for operator */
precedence, /* operator precedence */
isLeftAssociative, /* operator is left associative */
commutatorName, /* optional commutator operator
* name */
negatorName, /* optional negator operator name */
restrictionName, /* optional restrict. sel.
* procedure */
joinName, /* optional join sel. procedure name */
canHash, /* operator hashes */
sortName1, /* optional first sort operator */
sortName2); /* optional second sort operator */
}
/* -------------------
* DefineAggregate
* ------------------
*/
void
DefineAggregate(char *aggName, List *parameters)
{
char *stepfunc1Name = NULL;
char *stepfunc2Name = NULL;
char *finalfuncName = NULL;
char *baseType = NULL;
char *stepfunc1Type = NULL;
char *stepfunc2Type = NULL;
char *init1 = NULL;
char *init2 = NULL;
List *pl;
foreach(pl, parameters)
{
DefElem *defel = (DefElem *) lfirst(pl);
/*
* sfunc1
*/
if (!strcasecmp(defel->defname, "sfunc1"))
stepfunc1Name = defGetString(defel);
else if (!strcasecmp(defel->defname, "basetype"))
baseType = defGetString(defel);
else if (!strcasecmp(defel->defname, "stype1"))
{
stepfunc1Type = defGetString(defel);
/*
* sfunc2
*/
}
else if (!strcasecmp(defel->defname, "sfunc2"))
stepfunc2Name = defGetString(defel);
else if (!strcasecmp(defel->defname, "stype2"))
{
stepfunc2Type = defGetString(defel);
/*
* final
*/
}
else if (!strcasecmp(defel->defname, "finalfunc"))
{
finalfuncName = defGetString(defel);
/*
* initial conditions
*/
}
else if (!strcasecmp(defel->defname, "initcond1"))
init1 = defGetString(defel);
else if (!strcasecmp(defel->defname, "initcond2"))
init2 = defGetString(defel);
else
{
elog(NOTICE, "DefineAggregate: attribute \"%s\" not recognized",
defel->defname);
}
}
/*
* make sure we have our required definitions
*/
if (baseType == NULL)
elog(ERROR, "Define: \"basetype\" unspecified");
if (stepfunc1Name != NULL)
{
if (stepfunc1Type == NULL)
elog(ERROR, "Define: \"stype1\" unspecified");
}
if (stepfunc2Name != NULL)
{
if (stepfunc2Type == NULL)
elog(ERROR, "Define: \"stype2\" unspecified");
}
/*
* Most of the argument-checking is done inside of AggregateCreate
*/
AggregateCreate(aggName, /* aggregate name */
stepfunc1Name, /* first step function name */
stepfunc2Name, /* second step function name */
finalfuncName, /* final function name */
baseType, /* type of object being aggregated */
stepfunc1Type, /* return type of first function */
stepfunc2Type, /* return type of second function */
init1, /* first initial condition */
init2); /* second initial condition */
/* XXX free palloc'd memory */
}
/*
* DefineType
* Registers a new type.
*
*/
void
DefineType(char *typeName, List *parameters)
{
int16 internalLength = 0; /* int2 */
int16 externalLength = 0; /* int2 */
char *elemName = NULL;
char *inputName = NULL;
char *outputName = NULL;
char *sendName = NULL;
char *receiveName = NULL;
char *defaultValue = NULL; /* Datum */
bool byValue = false;
char delimiter = DEFAULT_TYPDELIM;
char *shadow_type;
List *pl;
char alignment = 'i';/* default alignment */
/*
* Type names can only be 15 characters long, so that the shadow type
* can be created using the 16th character as necessary.
*/
if (strlen(typeName) >= (NAMEDATALEN - 1))
{
elog(ERROR, "DefineType: type names must be %d characters or less",
NAMEDATALEN - 1);
}
foreach(pl, parameters)
{
DefElem *defel = (DefElem *) lfirst(pl);
if (!strcasecmp(defel->defname, "internallength"))
internalLength = defGetTypeLength(defel);
else if (!strcasecmp(defel->defname, "externallength"))
externalLength = defGetTypeLength(defel);
else if (!strcasecmp(defel->defname, "input"))
inputName = defGetString(defel);
else if (!strcasecmp(defel->defname, "output"))
outputName = defGetString(defel);
else if (!strcasecmp(defel->defname, "send"))
sendName = defGetString(defel);
else if (!strcasecmp(defel->defname, "delimiter"))
{
char *p = defGetString(defel);
delimiter = p[0];
}
else if (!strcasecmp(defel->defname, "receive"))
receiveName = defGetString(defel);
else if (!strcasecmp(defel->defname, "element"))
elemName = defGetString(defel);
else if (!strcasecmp(defel->defname, "default"))
defaultValue = defGetString(defel);
else if (!strcasecmp(defel->defname, "passedbyvalue"))
byValue = true;
else if (!strcasecmp(defel->defname, "alignment"))
{
char *a = defGetString(defel);
if (!strcasecmp(a, "double"))
alignment = 'd';
else if (!strcasecmp(a, "int"))
alignment = 'i';
else
{
elog(ERROR, "DefineType: \"%s\" alignment not recognized",
a);
}
}
else
{
elog(NOTICE, "DefineType: attribute \"%s\" not recognized",
defel->defname);
}
}
/*
* make sure we have our required definitions
*/
if (inputName == NULL)
elog(ERROR, "Define: \"input\" unspecified");
if (outputName == NULL)
elog(ERROR, "Define: \"output\" unspecified");
/* ----------------
* now have TypeCreate do all the real work.
* ----------------
*/
TypeCreate(typeName, /* type name */
InvalidOid, /* relation oid (n/a here) */
internalLength, /* internal size */
externalLength, /* external size */
'b', /* type-type (base type) */
delimiter, /* array element delimiter */
inputName, /* input procedure */
outputName, /* output procedure */
receiveName, /* receive procedure */
sendName, /* send procedure */
elemName, /* element type name */
defaultValue, /* default type value */
byValue, /* passed by value */
alignment);
/* ----------------
* When we create a true type (as opposed to a complex type)
* we need to have an shadow array entry for it in pg_type as well.
* ----------------
*/
shadow_type = makeArrayTypeName(typeName);
TypeCreate(shadow_type, /* type name */
InvalidOid, /* relation oid (n/a here) */
-1, /* internal size */
-1, /* external size */
'b', /* type-type (base type) */
DEFAULT_TYPDELIM,/* array element delimiter */
"array_in", /* input procedure */
"array_out", /* output procedure */
"array_in", /* receive procedure */
"array_out", /* send procedure */
typeName, /* element type name */
defaultValue, /* default type value */
false, /* never passed by value */
alignment);
pfree(shadow_type);
}
static char *
defGetString(DefElem *def)
{
if (nodeTag(def->arg) != T_String)
elog(ERROR, "Define: \"%s\" = what?", def->defname);
return strVal(def->arg);
}
static int
defGetTypeLength(DefElem *def)
{
if (nodeTag(def->arg) == T_Integer)
return intVal(def->arg);
else if (nodeTag(def->arg) == T_String &&
!strcasecmp(strVal(def->arg), "variable"))
return -1; /* variable length */
elog(ERROR, "Define: \"%s\" = what?", def->defname);
return -1;
}
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