static HeapTuple make_tuple_from_row(PLpgSQL_execstate *estate,
PLpgSQL_row *row,
TupleDesc tupdesc);
-static char *convert_value_to_string(Datum value, Oid valtype);
-static Datum exec_cast_value(Datum value, Oid valtype,
+static char *convert_value_to_string(PLpgSQL_execstate *estate,
+ Datum value, Oid valtype);
+static Datum exec_cast_value(PLpgSQL_execstate *estate,
+ Datum value, Oid valtype,
Oid reqtype,
FmgrInfo *reqinput,
Oid reqtypioparam,
int32 reqtypmod,
bool isnull);
-static Datum exec_simple_cast_value(Datum value, Oid valtype,
+static Datum exec_simple_cast_value(PLpgSQL_execstate *estate,
+ Datum value, Oid valtype,
Oid reqtype, int32 reqtypmod,
bool isnull);
static void exec_init_tuple_store(PLpgSQL_execstate *estate);
/* If arg is null, treat it as an empty row */
exec_move_row(&estate, NULL, row, NULL, NULL);
}
+ /* clean up after exec_move_row() */
+ exec_eval_cleanup(&estate);
}
break;
else
{
/* Cast value to proper type */
- estate.retval = exec_cast_value(estate.retval, estate.rettype,
+ estate.retval = exec_cast_value(&estate,
+ estate.retval,
+ estate.rettype,
func->fn_rettype,
&(func->fn_retinput),
func->fn_rettypioparam,
* Get the value of the lower bound
*/
value = exec_eval_expr(estate, stmt->lower, &isnull, &valtype);
- value = exec_cast_value(value, valtype, var->datatype->typoid,
+ value = exec_cast_value(estate, value, valtype, var->datatype->typoid,
&(var->datatype->typinput),
var->datatype->typioparam,
var->datatype->atttypmod, isnull);
* Get the value of the upper bound
*/
value = exec_eval_expr(estate, stmt->upper, &isnull, &valtype);
- value = exec_cast_value(value, valtype, var->datatype->typoid,
+ value = exec_cast_value(estate, value, valtype, var->datatype->typoid,
&(var->datatype->typinput),
var->datatype->typioparam,
var->datatype->atttypmod, isnull);
if (stmt->step)
{
value = exec_eval_expr(estate, stmt->step, &isnull, &valtype);
- value = exec_cast_value(value, valtype, var->datatype->typoid,
+ value = exec_cast_value(estate, value, valtype, var->datatype->typoid,
&(var->datatype->typinput),
var->datatype->typioparam,
var->datatype->atttypmod, isnull);
errmsg("wrong result type supplied in RETURN NEXT")));
/* coerce type if needed */
- retval = exec_simple_cast_value(retval,
+ retval = exec_simple_cast_value(estate,
+ retval,
var->datatype->typoid,
tupdesc->attrs[0]->atttypid,
tupdesc->attrs[0]->atttypmod,
&rettype);
/* coerce type if needed */
- retval = exec_simple_cast_value(retval,
+ retval = exec_simple_cast_value(estate,
+ retval,
rettype,
tupdesc->attrs[0]->atttypid,
tupdesc->attrs[0]->atttypmod,
tuplestore_putvalues(estate->tuple_store, tupdesc,
&retval, &isNull);
-
- exec_eval_cleanup(estate);
}
else
{
heap_freetuple(tuple);
}
+ exec_eval_cleanup(estate);
+
return PLPGSQL_RC_OK;
}
if (paramisnull)
extval = "<NULL>";
else
- extval = convert_value_to_string(paramvalue, paramtypeid);
+ extval = convert_value_to_string(estate,
+ paramvalue,
+ paramtypeid);
appendStringInfoString(&ds, extval);
current_param = lnext(current_param);
exec_eval_cleanup(estate);
(errcode(ERRCODE_NULL_VALUE_NOT_ALLOWED),
errmsg("RAISE statement option cannot be null")));
- extval = convert_value_to_string(optionvalue, optiontypeid);
+ extval = convert_value_to_string(estate, optionvalue, optiontypeid);
switch (opt->opt_type)
{
}
/* Clean up */
+ exec_eval_cleanup(estate);
SPI_freetuptable(SPI_tuptable);
}
else
errmsg("query string argument of EXECUTE is null")));
/* Get the C-String representation */
- querystr = convert_value_to_string(query, restype);
+ querystr = convert_value_to_string(estate, query, restype);
+
+ /* copy it out of the temporary context before we clean up */
+ querystr = pstrdup(querystr);
exec_eval_cleanup(estate);
/* Put the first result row into the target */
exec_move_row(estate, rec, row, tuptab->vals[0], tuptab->tupdesc);
}
+ /* clean up after exec_move_row() */
+ exec_eval_cleanup(estate);
}
else
{
else
exec_move_row(estate, rec, row, tuptab->vals[0], tuptab->tupdesc);
+ exec_eval_cleanup(estate);
SPI_freetuptable(tuptab);
}
else
/* ----------
* exec_assign_value Put a value into a target field
*
- * Note: in some code paths, this may leak memory in the eval_econtext;
+ * Note: in some code paths, this will leak memory in the eval_econtext;
* we assume that will be cleaned up later by exec_eval_cleanup. We cannot
* call exec_eval_cleanup here for fear of destroying the input Datum value.
* ----------
PLpgSQL_var *var = (PLpgSQL_var *) target;
Datum newvalue;
- newvalue = exec_cast_value(value, valtype, var->datatype->typoid,
+ newvalue = exec_cast_value(estate,
+ value,
+ valtype,
+ var->datatype->typoid,
&(var->datatype->typinput),
var->datatype->typioparam,
var->datatype->atttypmod,
var->refname)));
/*
- * If type is by-reference, make sure we have a freshly
- * palloc'd copy; the originally passed value may not live as
- * long as the variable! But we don't need to re-copy if
- * exec_cast_value performed a conversion; its output must
- * already be palloc'd.
+ * If type is by-reference, copy the new value (which is
+ * probably in the eval_econtext) into the procedure's
+ * memory context.
*/
if (!var->datatype->typbyval && !*isNull)
- {
- if (newvalue == value)
- newvalue = datumCopy(newvalue,
- false,
- var->datatype->typlen);
- }
+ newvalue = datumCopy(newvalue,
+ false,
+ var->datatype->typlen);
/*
* Now free the old value. (We can't do this any earlier
Datum *values;
bool *nulls;
bool *replaces;
- void *mustfree;
bool attisnull;
Oid atttype;
int32 atttypmod;
atttype = SPI_gettypeid(rec->tupdesc, fno + 1);
atttypmod = rec->tupdesc->attrs[fno]->atttypmod;
attisnull = *isNull;
- values[fno] = exec_simple_cast_value(value,
+ values[fno] = exec_simple_cast_value(estate,
+ value,
valtype,
atttype,
atttypmod,
attisnull);
nulls[fno] = attisnull;
- /*
- * Avoid leaking the result of exec_simple_cast_value, if it
- * performed a conversion to a pass-by-ref type.
- */
- if (!attisnull && values[fno] != value && !get_typbyval(atttype))
- mustfree = DatumGetPointer(values[fno]);
- else
- mustfree = NULL;
-
/*
* Now call heap_modify_tuple() to create a new tuple that
* replaces the old one in the record.
pfree(values);
pfree(nulls);
pfree(replaces);
- if (mustfree)
- pfree(mustfree);
break;
}
ArrayType *oldarrayval;
ArrayType *newarrayval;
SPITupleTable *save_eval_tuptable;
+ MemoryContext oldcontext;
/*
* We need to do subscript evaluation, which might require
estate->eval_tuptable = save_eval_tuptable;
/* Coerce source value to match array element type. */
- coerced_value = exec_simple_cast_value(value,
+ coerced_value = exec_simple_cast_value(estate,
+ value,
valtype,
arrayelem->elemtypoid,
arrayelem->arraytypmod,
(oldarrayisnull || *isNull))
return;
+ /* oldarrayval and newarrayval should be short-lived */
+ oldcontext = MemoryContextSwitchTo(estate->eval_econtext->ecxt_per_tuple_memory);
+
if (oldarrayisnull)
oldarrayval = construct_empty_array(arrayelem->elemtypoid);
else
arrayelem->elemtypbyval,
arrayelem->elemtypalign);
- /*
- * Avoid leaking the result of exec_simple_cast_value, if it
- * performed a conversion to a pass-by-ref type.
- */
- if (!*isNull && coerced_value != value &&
- !arrayelem->elemtypbyval)
- pfree(DatumGetPointer(coerced_value));
+ MemoryContextSwitchTo(oldcontext);
/*
* Assign the new array to the base variable. It's never NULL
exec_assign_value(estate, target,
PointerGetDatum(newarrayval),
arrayelem->arraytypoid, isNull);
-
- /*
- * Avoid leaking the modified array value, too.
- */
- pfree(newarrayval);
break;
}
Oid exprtypeid;
exprdatum = exec_eval_expr(estate, expr, isNull, &exprtypeid);
- exprdatum = exec_simple_cast_value(exprdatum, exprtypeid,
+ exprdatum = exec_simple_cast_value(estate, exprdatum, exprtypeid,
INT4OID, -1,
*isNull);
return DatumGetInt32(exprdatum);
Oid exprtypeid;
exprdatum = exec_eval_expr(estate, expr, isNull, &exprtypeid);
- exprdatum = exec_simple_cast_value(exprdatum, exprtypeid,
+ exprdatum = exec_simple_cast_value(estate, exprdatum, exprtypeid,
BOOLOID, -1,
*isNull);
return DatumGetBool(exprdatum);
* through with found = false.
*/
if (n <= 0)
+ {
exec_move_row(estate, rec, row, NULL, tuptab->tupdesc);
+ exec_eval_cleanup(estate);
+ }
else
found = true; /* processed at least one tuple */
* Assign the tuple to the target
*/
exec_move_row(estate, rec, row, tuptab->vals[i], tuptab->tupdesc);
+ exec_eval_cleanup(estate);
/*
* Execute the statements
/* ----------
* exec_move_row Move one tuple's values into a record or row
+ *
+ * Since this uses exec_assign_value, caller should eventually call
+ * exec_eval_cleanup to prevent long-term memory leaks.
* ----------
*/
static void
/* ----------
* convert_value_to_string Convert a non-null Datum to C string
*
- * Note: callers generally assume that the result is a palloc'd string and
- * should be pfree'd. This is not all that safe an assumption ...
+ * Note: the result is in the estate's eval_econtext, and will be cleared
+ * by the next exec_eval_cleanup() call. The invoked output function might
+ * leave additional cruft there as well, so just pfree'ing the result string
+ * would not be enough to avoid memory leaks if we did not do it like this.
+ * In most usages the Datum being passed in is also in that context (if
+ * pass-by-reference) and so an exec_eval_cleanup() call is needed anyway.
*
* Note: not caching the conversion function lookup is bad for performance.
* ----------
*/
static char *
-convert_value_to_string(Datum value, Oid valtype)
+convert_value_to_string(PLpgSQL_execstate *estate, Datum value, Oid valtype)
{
+ char *result;
+ MemoryContext oldcontext;
Oid typoutput;
bool typIsVarlena;
+ oldcontext = MemoryContextSwitchTo(estate->eval_econtext->ecxt_per_tuple_memory);
getTypeOutputInfo(valtype, &typoutput, &typIsVarlena);
- return OidOutputFunctionCall(typoutput, value);
+ result = OidOutputFunctionCall(typoutput, value);
+ MemoryContextSwitchTo(oldcontext);
+
+ return result;
}
/* ----------
* exec_cast_value Cast a value if required
+ *
+ * Note: the estate's eval_econtext is used for temporary storage, and may
+ * also contain the result Datum if we have to do a conversion to a pass-
+ * by-reference data type. Be sure to do an exec_eval_cleanup() call when
+ * done with the result.
* ----------
*/
static Datum
-exec_cast_value(Datum value, Oid valtype,
+exec_cast_value(PLpgSQL_execstate *estate,
+ Datum value, Oid valtype,
Oid reqtype,
FmgrInfo *reqinput,
Oid reqtypioparam,
bool isnull)
{
/*
- * If the type of the queries return value isn't that of the variable,
- * convert it.
+ * If the type of the given value isn't what's requested, convert it.
*/
if (valtype != reqtype || reqtypmod != -1)
{
+ MemoryContext oldcontext;
+
+ oldcontext = MemoryContextSwitchTo(estate->eval_econtext->ecxt_per_tuple_memory);
if (!isnull)
{
char *extval;
- extval = convert_value_to_string(value, valtype);
+ extval = convert_value_to_string(estate, value, valtype);
value = InputFunctionCall(reqinput, extval,
reqtypioparam, reqtypmod);
- pfree(extval);
}
else
{
value = InputFunctionCall(reqinput, NULL,
reqtypioparam, reqtypmod);
}
+ MemoryContextSwitchTo(oldcontext);
}
return value;
* ----------
*/
static Datum
-exec_simple_cast_value(Datum value, Oid valtype,
+exec_simple_cast_value(PLpgSQL_execstate *estate,
+ Datum value, Oid valtype,
Oid reqtype, int32 reqtypmod,
bool isnull)
{
fmgr_info(typinput, &finfo_input);
- value = exec_cast_value(value,
+ value = exec_cast_value(estate,
+ value,
valtype,
reqtype,
&finfo_input,
errmsg("query string argument of EXECUTE is null")));
/* Get the C-String representation */
- querystr = convert_value_to_string(query, restype);
+ querystr = convert_value_to_string(estate, query, restype);
+
+ /* copy it out of the temporary context before we clean up */
+ querystr = pstrdup(querystr);
exec_eval_cleanup(estate);
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