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check_function.c
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/*-------------------------------------------------------------------------
*
* check_function.c
*
* workhorse functionality of this extension - expression
* and query validator
*
* by Pavel Stehule 2013-2025
*
*-------------------------------------------------------------------------
*/
#include "plpgsql_check.h"
#include "catalog/pg_proc.h"
#include "catalog/pg_type.h"
#include "nodes/makefuncs.h"
#include "utils/guc.h"
#include "utils/memutils.h"
#include "utils/lsyscache.h"
#include "utils/rel.h"
#include "utils/syscache.h"
#include "utils/typcache.h"
#include "access/heapam.h"
static HTAB *plpgsql_check_HashTable = NULL;
bool plpgsql_check_other_warnings = false;
bool plpgsql_check_extra_warnings = false;
bool plpgsql_check_performance_warnings = false;
bool plpgsql_check_compatibility_warnings = false;
bool plpgsql_check_fatal_errors = true;
bool plpgsql_check_constants_tracing = true;
int plpgsql_check_mode = PLPGSQL_CHECK_MODE_BY_FUNCTION;
/* ----------
* Hash table for checked functions
* ----------
*/
typedef struct plpgsql_hashent
{
#if PG_VERSION_NUM >= 180000
CachedFunctionHashKey key;
#else
PLpgSQL_func_hashkey key;
#endif
TransactionId fn_xmin;
ItemPointerData fn_tid;
bool is_checked;
} plpgsql_check_HashEnt;
static void function_check(PLpgSQL_function *func, PLpgSQL_checkstate *cstate);
static void trigger_check(PLpgSQL_function *func, Node *tdata, PLpgSQL_checkstate *cstate);
static void release_exprs(List *exprs);
static int load_configuration(HeapTuple procTuple, bool *reload_config);
static void init_datum_dno(PLpgSQL_checkstate *cstate, int dno, bool is_auto, bool is_protected);
static PLpgSQL_datum * copy_plpgsql_datum(PLpgSQL_checkstate *cstate, PLpgSQL_datum *datum);
static void setup_estate(PLpgSQL_execstate *estate, PLpgSQL_function *func, ReturnSetInfo *rsi, plpgsql_check_info *cinfo);
static void setup_cstate(PLpgSQL_checkstate *cstate, plpgsql_check_result_info *result_info,
plpgsql_check_info *cinfo, bool is_active_mode, bool fake_rtd);
static void passive_check_func_beg(PLpgSQL_execstate *estate, PLpgSQL_function *func, void **plugin2_info);
static plpgsql_check_plugin2 check_plugin2 = { NULL,
passive_check_func_beg, NULL, NULL,
NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL };
/*
* Prepare list of OUT variables for later report
*/
static void
collect_out_variables(PLpgSQL_function *func, PLpgSQL_checkstate *cstate)
{
cstate->out_variables = NULL;
if (func->out_param_varno != -1)
{
int varno = func->out_param_varno;
PLpgSQL_variable *var = (PLpgSQL_variable *) func->datums[varno];
if (var->dtype == PLPGSQL_DTYPE_ROW && is_internal_variable(cstate, var))
{
/* this function has more OUT parameters */
PLpgSQL_row *row = (PLpgSQL_row*) var;
int fnum;
for (fnum = 0; fnum < row->nfields; fnum++)
cstate->out_variables = bms_add_member(cstate->out_variables, row->varnos[fnum]);
}
else
cstate->out_variables = bms_add_member(cstate->out_variables, varno);
}
}
/*
* Returns true, when routine should be closed by RETURN statement
*
*/
static bool
return_is_required(plpgsql_check_info *cinfo)
{
if (cinfo->is_procedure)
return false;
if (cinfo->rettype == VOIDOID)
return false;
return true;
}
/*
* own implementation - active mode
*
*/
void
plpgsql_check_function_internal(plpgsql_check_result_info *ri,
plpgsql_check_info *cinfo)
{
PLpgSQL_checkstate cstate;
PLpgSQL_function *volatile function = NULL;
bool reload_config;
LOCAL_FCINFO(fake_fcinfo, 0);
FmgrInfo flinfo;
TriggerData trigdata;
EventTriggerData etrigdata;
Trigger tg_trigger;
int rc;
ResourceOwner oldowner;
PLpgSQL_execstate *cur_estate = NULL;
MemoryContext old_cxt;
PLpgSQL_execstate estate;
ReturnSetInfo rsinfo;
bool fake_rtd;
/*
* Connect to SPI manager
*/
if ((rc = SPI_connect()) != SPI_OK_CONNECT)
elog(ERROR, "SPI_connect failed: %s", SPI_result_code_string(rc));
plpgsql_check_setup_fcinfo(cinfo,
&flinfo,
fake_fcinfo,
&rsinfo,
&trigdata,
&etrigdata,
&tg_trigger,
&fake_rtd);
setup_cstate(&cstate, ri, cinfo, true, fake_rtd);
old_cxt = MemoryContextSwitchTo(cstate.check_cxt);
/*
* Copy argument names for later check, only when other warnings are required.
* Argument names are used for check parameter versus local variable collision.
*/
if (cinfo->other_warnings)
{
int numargs;
Oid *argtypes;
char **argnames;
char *argmodes;
numargs = get_func_arg_info(cinfo->proctuple,
&argtypes, &argnames, &argmodes);
if (argnames != NULL)
{
int i;
for (i = 0; i < numargs; i++)
{
if (argnames[i][0] != '\0')
cstate.argnames = lappend(cstate.argnames, argnames[i]);
}
}
}
oldowner = CurrentResourceOwner;
PG_TRY();
{
int save_nestlevel = 0;
BeginInternalSubTransaction(NULL);
MemoryContextSwitchTo(cstate.check_cxt);
save_nestlevel = load_configuration(cinfo->proctuple, &reload_config);
/* have to wait for this decision to loaded configuration */
if (plpgsql_check_mode != PLPGSQL_CHECK_MODE_DISABLED)
{
/* Get a compiled function */
function = plpgsql_check__compile_p(fake_fcinfo, false);
collect_out_variables(function, &cstate);
/* Must save and restore prior value of cur_estate */
cur_estate = function->cur_estate;
/* recheck trigtype */
Assert(function->fn_is_trigger == cinfo->trigtype);
setup_estate(&estate, function, (ReturnSetInfo *) fake_fcinfo->resultinfo, cinfo);
cstate.estate = &estate;
/*
* Mark the function as busy, ensure higher than zero usage. There is no
* reason for protection function against delete, but I afraid of asserts.
*/
#if PG_VERSION_NUM >= 180000
function->cfunc.use_count++;
#else
function->use_count++;
#endif
/* Create a fake runtime environment and process check */
switch (cinfo->trigtype)
{
case PLPGSQL_DML_TRIGGER:
trigger_check(function, (Node *) &trigdata, &cstate);
break;
case PLPGSQL_EVENT_TRIGGER:
trigger_check(function, (Node *) &etrigdata, &cstate);
break;
case PLPGSQL_NOT_TRIGGER:
function_check(function, &cstate);
break;
}
function->cur_estate = cur_estate;
#if PG_VERSION_NUM >= 180000
function->cfunc.use_count--;
#else
function->use_count--;
#endif
}
else
elog(NOTICE, "plpgsql_check is disabled");
/*
* reload back a GUC. XXX: isn't this done automatically by subxact
* rollback?
*/
if (reload_config)
AtEOXact_GUC(true, save_nestlevel);
RollbackAndReleaseCurrentSubTransaction();
MemoryContextSwitchTo(cstate.check_cxt);
CurrentResourceOwner = oldowner;
if (OidIsValid(cinfo->relid))
relation_close(trigdata.tg_relation, AccessShareLock);
release_exprs(cstate.exprs);
}
PG_CATCH();
{
ErrorData *edata;
MemoryContextSwitchTo(cstate.check_cxt);
edata = CopyErrorData();
FlushErrorState();
RollbackAndReleaseCurrentSubTransaction();
MemoryContextSwitchTo(cstate.check_cxt);
CurrentResourceOwner = oldowner;
if (OidIsValid(cinfo->relid))
relation_close(trigdata.tg_relation, AccessShareLock);
if (function)
{
function->cur_estate = cur_estate;
#if PG_VERSION_NUM >= 180000
function->cfunc.use_count--;
#else
function->use_count--;
#endif
release_exprs(cstate.exprs);
}
plpgsql_check_put_error_edata(&cstate, edata);
}
PG_END_TRY();
MemoryContextSwitchTo(old_cxt);
MemoryContextDelete(cstate.check_cxt);
/*
* Disconnect from SPI manager
*/
if ((rc = SPI_finish()) != SPI_OK_FINISH)
elog(ERROR, "SPI_finish failed: %s", SPI_result_code_string(rc));
}
/*
* plpgsql_check_on_func_beg - passive mode
*
* callback function - called by plgsql executor, when function is started
* and local variables are initialized.
*
*/
static void
passive_check_func_beg(PLpgSQL_execstate *estate, PLpgSQL_function *func, void **plugin2_info)
{
const char *err_text = estate->err_text;
int closing;
List *exceptions;
if (plpgsql_check_mode == PLPGSQL_CHECK_MODE_FRESH_START ||
plpgsql_check_mode == PLPGSQL_CHECK_MODE_EVERY_START)
{
int i;
PLpgSQL_rec *saved_records;
PLpgSQL_var *saved_vars;
MemoryContext oldcontext,
old_cxt;
ResourceOwner oldowner;
plpgsql_check_result_info ri;
plpgsql_check_info cinfo;
PLpgSQL_checkstate cstate;
/*
* don't allow repeated execution on checked function
* when it is not requsted.
*/
if (plpgsql_check_mode == PLPGSQL_CHECK_MODE_FRESH_START &&
plpgsql_check_is_checked(func))
return;
plpgsql_check_mark_as_checked(func);
memset(&ri, 0, sizeof(ri));
plpgsql_check_info_init(&cinfo, func->fn_oid);
if (OidIsValid(func->fn_oid))
{
cinfo.proctuple = SearchSysCache1(PROCOID, ObjectIdGetDatum(func->fn_oid));
if (!HeapTupleIsValid(cinfo.proctuple))
elog(ERROR, "cache lookup failed for function %u", func->fn_oid);
plpgsql_check_get_function_info(&cinfo);
ReleaseSysCache(cinfo.proctuple);
cinfo.proctuple = NULL;
cinfo.fn_oid = func->fn_oid;
}
else
cinfo.volatility = PROVOLATILE_VOLATILE;
cinfo.fatal_errors = plpgsql_check_fatal_errors,
cinfo.other_warnings = plpgsql_check_other_warnings,
cinfo.performance_warnings = plpgsql_check_performance_warnings,
cinfo.extra_warnings = plpgsql_check_extra_warnings,
cinfo.compatibility_warnings = plpgsql_check_compatibility_warnings;
cinfo.constants_tracing = plpgsql_check_constants_tracing;
ri.format = PLPGSQL_CHECK_FORMAT_ELOG;
setup_cstate(&cstate, &ri, &cinfo, false, false);
collect_out_variables(func, &cstate);
/* use real estate */
cstate.estate = estate;
old_cxt = MemoryContextSwitchTo(cstate.check_cxt);
/*
* During the check stage a rec and vars variables are modified, so we should
* to save their content
*/
saved_records = palloc(sizeof(PLpgSQL_rec) * estate->ndatums);
saved_vars = palloc(sizeof(PLpgSQL_var) * estate->ndatums);
for (i = 0; i < estate->ndatums; i++)
{
if (estate->datums[i]->dtype == PLPGSQL_DTYPE_REC)
{
PLpgSQL_rec *rec = (PLpgSQL_rec *) estate->datums[i];
memcpy(&saved_records[i], rec, sizeof(PLpgSQL_rec));
if (rec->erh)
{
/* work with dummy copy */
rec->erh = make_expanded_record_from_exprecord(rec->erh, cstate.check_cxt);
}
}
else if (estate->datums[i]->dtype == PLPGSQL_DTYPE_VAR)
{
PLpgSQL_var *var = (PLpgSQL_var *) estate->datums[i];
saved_vars[i].value = var->value;
saved_vars[i].isnull = var->isnull;
saved_vars[i].freeval = var->freeval;
var->freeval = false;
}
}
estate->err_text = NULL;
/*
* Raised exception should be trapped in outer functtion. Protection
* against outer trap is QUERY_CANCELED exception.
*/
oldcontext = CurrentMemoryContext;
oldowner = CurrentResourceOwner;
PG_TRY();
{
/*
* Now check the toplevel block of statements
*/
plpgsql_check_stmt(&cstate, (PLpgSQL_stmt *) func->action, &closing, &exceptions);
estate->err_stmt = NULL;
if (!cstate.stop_check)
{
if (closing != PLPGSQL_CHECK_CLOSED && closing != PLPGSQL_CHECK_CLOSED_BY_EXCEPTIONS &&
return_is_required(cstate.cinfo))
plpgsql_check_put_error(&cstate,
ERRCODE_S_R_E_FUNCTION_EXECUTED_NO_RETURN_STATEMENT, 0,
"control reached end of function without RETURN",
NULL,
NULL,
closing == PLPGSQL_CHECK_UNCLOSED ?
PLPGSQL_CHECK_ERROR : PLPGSQL_CHECK_WARNING_EXTRA,
0, NULL, NULL);
plpgsql_check_report_unused_variables(&cstate);
plpgsql_check_report_too_high_volatility(&cstate);
}
release_exprs(cstate.exprs);
}
PG_CATCH();
{
ErrorData *edata;
/* Save error info */
MemoryContextSwitchTo(oldcontext);
edata = CopyErrorData();
FlushErrorState();
CurrentResourceOwner = oldowner;
release_exprs(cstate.exprs);
edata->sqlerrcode = ERRCODE_QUERY_CANCELED;
ReThrowError(edata);
}
PG_END_TRY();
estate->err_text = err_text;
estate->err_stmt = NULL;
/* return back a original rec variables */
for (i = 0; i < estate->ndatums; i++)
{
if (estate->datums[i]->dtype == PLPGSQL_DTYPE_REC)
{
PLpgSQL_rec *rec = (PLpgSQL_rec *) estate->datums[i];
memcpy(rec, &saved_records[i], sizeof(PLpgSQL_rec));
}
else if (estate->datums[i]->dtype == PLPGSQL_DTYPE_VAR)
{
PLpgSQL_var *var = (PLpgSQL_var *) estate->datums[i];
var->value = saved_vars[i].value;
var->isnull = saved_vars[i].isnull;
var->freeval = saved_vars[i].freeval;
}
}
MemoryContextSwitchTo(old_cxt);
MemoryContextDelete(cstate.check_cxt);
}
}
void
plpgsql_check_passive_check_init(void)
{
plpgsql_check_register_pldbgapi2_plugin(&check_plugin2);
}
/*
* Check function - it prepare variables and starts a prepare plan walker
*
*/
static void
function_check(PLpgSQL_function *func, PLpgSQL_checkstate *cstate)
{
int i;
int closing = PLPGSQL_CHECK_UNCLOSED;
List *exceptions;
ListCell *lc;
/*
* Make local execution copies of all the datums
*/
for (i = 0; i < cstate->estate->ndatums; i++)
cstate->estate->datums[i] = copy_plpgsql_datum(cstate, func->datums[i]);
init_datum_dno(cstate, cstate->estate->found_varno, true, true);
/*
* check function's parameters to not be reserved keywords
*/
foreach(lc, cstate->argnames)
{
char *argname = (char *) lfirst(lc);
if (plpgsql_check_is_reserved_keyword(argname))
{
StringInfoData str;
initStringInfo(&str);
appendStringInfo(&str, "name of parameter \"%s\" is reserved keyword",
argname);
plpgsql_check_put_error(cstate,
0, 0,
str.data,
"The reserved keyword was used as parameter name.",
NULL,
PLPGSQL_CHECK_WARNING_OTHERS,
0, NULL, NULL);
pfree(str.data);
}
}
/*
* Store the actual call argument values (fake) into the appropriate
* variables
*/
for (i = 0; i < func->fn_nargs; i++)
{
init_datum_dno(cstate, func->fn_argvarnos[i], false, false);
}
/*
* Now check the toplevel block of statements
*/
plpgsql_check_stmt(cstate, (PLpgSQL_stmt *) func->action, &closing, &exceptions);
/* clean state values - next errors are not related to any command */
cstate->estate->err_stmt = NULL;
if (!cstate->stop_check)
{
if (closing != PLPGSQL_CHECK_CLOSED && closing != PLPGSQL_CHECK_CLOSED_BY_EXCEPTIONS &&
return_is_required(cstate->cinfo))
plpgsql_check_put_error(cstate,
ERRCODE_S_R_E_FUNCTION_EXECUTED_NO_RETURN_STATEMENT, 0,
"control reached end of function without RETURN",
NULL,
NULL,
closing == PLPGSQL_CHECK_UNCLOSED ? PLPGSQL_CHECK_ERROR : PLPGSQL_CHECK_WARNING_EXTRA,
0, NULL, NULL);
plpgsql_check_report_unused_variables(cstate);
plpgsql_check_report_too_high_volatility(cstate);
}
}
/*
* Check trigger - prepare fake environments for testing trigger
*
*/
static void
trigger_check(PLpgSQL_function *func, Node *tdata, PLpgSQL_checkstate *cstate)
{
int i;
int closing = PLPGSQL_CHECK_UNCLOSED;
List *exceptions;
/*
* Make local execution copies of all the datums
*/
for (i = 0; i < cstate->estate->ndatums; i++)
cstate->estate->datums[i] = copy_plpgsql_datum(cstate, func->datums[i]);
init_datum_dno(cstate, cstate->estate->found_varno, true, true);
if (IsA(tdata, TriggerData))
{
PLpgSQL_rec *rec_new,
*rec_old;
TriggerData *trigdata = (TriggerData *) tdata;
/*
* Put the OLD and NEW tuples into record variables
*
* We make the tupdescs available in both records even though only one
* may have a value. This allows parsing of record references to
* succeed in functions that are used for multiple trigger types. For
* example, we might have a test like "if (TG_OP = 'INSERT' and
* NEW.foo = 'xyz')", which should parse regardless of the current
* trigger type.
*/
/*
* find all PROMISE VARIABLES and initit their
*/
for (i = 0; i < func->ndatums; i++)
{
PLpgSQL_datum *datum = func->datums[i];
if (datum->dtype == PLPGSQL_DTYPE_PROMISE)
init_datum_dno(cstate, datum->dno, true, datum->dno != func->new_varno && datum->dno != func->old_varno);
}
rec_new = (PLpgSQL_rec *) (cstate->estate->datums[func->new_varno]);
plpgsql_check_recval_assign_tupdesc(cstate, rec_new, trigdata->tg_relation->rd_att, false);
rec_old = (PLpgSQL_rec *) (cstate->estate->datums[func->old_varno]);
plpgsql_check_recval_assign_tupdesc(cstate, rec_old, trigdata->tg_relation->rd_att, false);
}
else if (IsA(tdata, EventTriggerData))
{
/* do nothing */
}
else
elog(ERROR, "unexpected environment");
/*
* Now check the toplevel block of statements
*/
plpgsql_check_stmt(cstate, (PLpgSQL_stmt *) func->action, &closing, &exceptions);
/* clean state values - next errors are not related to any command */
cstate->estate->err_stmt = NULL;
if (!cstate->stop_check)
{
if (closing != PLPGSQL_CHECK_CLOSED && closing != PLPGSQL_CHECK_CLOSED_BY_EXCEPTIONS &&
return_is_required(cstate->cinfo))
plpgsql_check_put_error(cstate,
ERRCODE_S_R_E_FUNCTION_EXECUTED_NO_RETURN_STATEMENT, 0,
"control reached end of function without RETURN",
NULL,
NULL,
closing == PLPGSQL_CHECK_UNCLOSED ? PLPGSQL_CHECK_ERROR : PLPGSQL_CHECK_WARNING_EXTRA,
0, NULL, NULL);
plpgsql_check_report_unused_variables(cstate);
plpgsql_check_report_too_high_volatility(cstate);
}
}
/*
* Returns true when some fields is polymorphics
*/
static bool
is_polymorphic_tupdesc(TupleDesc tupdesc)
{
int i;
for (i = 0; i < tupdesc->natts; i++)
if (IsPolymorphicType(TupleDescAttr(tupdesc, i)->atttypid))
return true;
return false;
}
/*
* Replaces polymorphic types by real type
*/
static Oid
replace_polymorphic_type(plpgsql_check_info *cinfo,
Oid typ,
Oid anyelement_array_oid,
bool is_array_anyelement,
Oid anycompatible_array_oid,
bool is_array_anycompatible,
bool is_variadic)
{
/* quite compiler warnings */
(void) anycompatible_array_oid;
(void) is_array_anycompatible;
if (OidIsValid(typ) && IsPolymorphicType(typ))
{
switch (typ)
{
case ANYELEMENTOID:
typ = is_variadic ? anyelement_array_oid : cinfo->anyelementoid;
break;
case ANYNONARRAYOID:
if (is_array_anyelement)
elog(ERROR, "anyelement type is a array (expected nonarray)");
typ = is_variadic ? anyelement_array_oid : cinfo->anyelementoid;
break;
case ANYENUMOID: /* XXX dubious */
if (!OidIsValid(cinfo->anyenumoid))
elog(ERROR, "anyenumtype option should be specified (anyenum type is used)");
if (!type_is_enum(cinfo->anyenumoid))
elog(ERROR, "type specified by anyenumtype option is not enum");
typ = cinfo->anyenumoid;
break;
case ANYARRAYOID:
typ = anyelement_array_oid;
break;
case ANYRANGEOID:
typ = is_variadic ? get_array_type(cinfo->anyrangeoid) : cinfo->anyrangeoid;
break;
case ANYCOMPATIBLEOID:
typ = is_variadic ? anycompatible_array_oid : cinfo->anycompatibleoid;
break;
case ANYCOMPATIBLENONARRAYOID:
if (is_array_anycompatible)
elog(ERROR, "anycompatible type is a array (expected nonarray)");
typ = is_variadic ? anycompatible_array_oid : cinfo->anycompatibleoid;
break;
case ANYCOMPATIBLEARRAYOID:
typ = anycompatible_array_oid;
break;
case ANYCOMPATIBLERANGEOID:
typ = is_variadic ? get_array_type(cinfo->anycompatiblerangeoid) : cinfo->anycompatiblerangeoid;
break;
default:
/* fallback */
typ = is_variadic ? INT4ARRAYOID : INT4OID;
}
}
return typ;
}
/*
* Set up a fake fcinfo with just enough info to satisfy plpgsql_compile().
*
* There should be a different real argtypes for polymorphic params.
*
* When output fake_rtd is true, then we should to not compare result fields,
* because we know nothing about expected result.
*/
void
plpgsql_check_setup_fcinfo(plpgsql_check_info *cinfo,
FmgrInfo *flinfo,
FunctionCallInfo fcinfo,
ReturnSetInfo *rsinfo,
TriggerData *trigdata,
EventTriggerData *etrigdata,
Trigger *tg_trigger,
bool *fake_rtd)
{
TupleDesc resultTupleDesc;
int nargs;
Oid *argtypes;
char **argnames;
char *argmodes;
Oid rettype;
bool found_polymorphic = false;
*fake_rtd = false;
/* clean structures */
MemSet(fcinfo, 0, SizeForFunctionCallInfo(0));
MemSet(flinfo, 0, sizeof(FmgrInfo));
MemSet(rsinfo, 0, sizeof(ReturnSetInfo));
fcinfo->flinfo = flinfo;
flinfo->fn_oid = cinfo->fn_oid;
flinfo->fn_mcxt = CurrentMemoryContext;
rettype = cinfo->rettype;
if (cinfo->trigtype == PLPGSQL_DML_TRIGGER)
{
Assert(trigdata != NULL);
MemSet(trigdata, 0, sizeof(TriggerData));
MemSet(tg_trigger, 0, sizeof(Trigger));
trigdata->type = T_TriggerData;
trigdata->tg_trigger = tg_trigger;
fcinfo->context = (Node *) trigdata;
if (OidIsValid(cinfo->relid))
trigdata->tg_relation = relation_open(cinfo->relid, AccessShareLock);
}
else if (cinfo->trigtype == PLPGSQL_EVENT_TRIGGER)
{
MemSet(etrigdata, 0, sizeof(etrigdata));
etrigdata->type = T_EventTriggerData;
fcinfo->context = (Node *) etrigdata;
}
/* prepare call expression - used for polymorphic arguments */
nargs = get_func_arg_info(cinfo->proctuple,
&argtypes,
&argnames,
&argmodes);
if (nargs > 0)
{
int i;
for (i = 0; i < nargs; i++)
{
Oid argtype = InvalidOid;
if (argmodes)
{
if (argmodes[i] == FUNC_PARAM_IN ||
argmodes[i] == FUNC_PARAM_INOUT ||
argmodes[i] == FUNC_PARAM_VARIADIC)
argtype = argtypes[i];
}
else
argtype = argtypes[i];
if (OidIsValid(argtype) && IsPolymorphicType(argtype))
{
found_polymorphic = true;
break;
}
}
if (found_polymorphic)
{
List *args = NIL;
Oid anyelement_array_oid;
Oid anyelement_base_oid;
bool is_array_anyelement;
Oid anycompatible_array_oid;
Oid anycompatible_base_oid;
bool is_array_anycompatible;
anyelement_array_oid = get_array_type(cinfo->anyelementoid);
anyelement_base_oid = getBaseType(cinfo->anyelementoid);
is_array_anyelement = OidIsValid(get_element_type(anyelement_base_oid));
anycompatible_array_oid = get_array_type(cinfo->anycompatibleoid);
anycompatible_base_oid = getBaseType(cinfo->anycompatibleoid);
is_array_anycompatible = OidIsValid(get_element_type(anycompatible_base_oid));
/*
* when polymorphic types are used, then we need to build fake fn_expr,
* to be in plpgsql_resolve_polymorphic_argtypes happy.
*/
for (i = 0; i < nargs; i++)
{
bool is_variadic = false;
Oid argtype = InvalidOid;
if (argmodes)
{
if (argmodes[i] == FUNC_PARAM_IN ||
argmodes[i] == FUNC_PARAM_INOUT ||
argmodes[i] == FUNC_PARAM_VARIADIC)
{
argtype = argtypes[i];
if (argmodes[i] == FUNC_PARAM_VARIADIC)
is_variadic = true;
}
}
else
argtype = argtypes[i];
if (OidIsValid(argtype))
{
argtype = replace_polymorphic_type(cinfo,
argtype,
anyelement_array_oid,
is_array_anyelement,
anycompatible_array_oid,
is_array_anycompatible,
is_variadic);
args = lappend(args,
makeNullConst(argtype, -1, InvalidOid));
}
}
rettype = replace_polymorphic_type(cinfo,
rettype,
anyelement_array_oid,
is_array_anyelement,
anycompatible_array_oid,
is_array_anycompatible,
false);
fcinfo->flinfo->fn_expr = (Node *) makeFuncExpr(cinfo->fn_oid,
rettype,
args,
InvalidOid,
InvalidOid,
COERCE_EXPLICIT_CALL);
}
}
if (argtypes)
pfree(argtypes);
if (argnames)
pfree(argnames);
if (argmodes)
pfree(argmodes);
/*
* prepare ReturnSetInfo
*
* necessary for RETURN NEXT and RETURN QUERY
*
*/
resultTupleDesc = build_function_result_tupdesc_t(cinfo->proctuple);
if (resultTupleDesc)
{
/* we cannot to solve polymorphic params now */
if (is_polymorphic_tupdesc(resultTupleDesc))
{
FreeTupleDesc(resultTupleDesc);
resultTupleDesc = NULL;
}
}
else if (cinfo->rettype == TRIGGEROID)
{
/* trigger - return value should be ROW or RECORD based on relid */
if (trigdata->tg_relation)
resultTupleDesc = CreateTupleDescCopy(trigdata->tg_relation->rd_att);
}
else if (!IsPolymorphicType(cinfo->rettype))
{
if (get_typtype(cinfo->rettype) == TYPTYPE_COMPOSITE)
resultTupleDesc = lookup_rowtype_tupdesc_copy(cinfo->rettype, -1);
else
{
*fake_rtd = cinfo->rettype == RECORDOID;
resultTupleDesc = CreateTemplateTupleDesc(1);
TupleDescInitEntry(resultTupleDesc,
(AttrNumber) 1, "__result__",
cinfo->rettype, -1, 0);
resultTupleDesc = BlessTupleDesc(resultTupleDesc);
}
}
else
{
if (IsPolymorphicType(cinfo->rettype))
{
/*
* ensure replacament of polymorphic rettype, but this
* error is checked in validation stage, so this case
* should not be possible.
*/
if (IsPolymorphicType(rettype))
elog(ERROR, "return type is still polymorphic");
}
}
if (resultTupleDesc)