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23543c732b
redirecting libxml's allocations into a Postgres context. Instead, just let it use malloc directly, and add PG_TRY blocks as needed to be sure we release libxml data structures in error recovery code paths. This is ugly but seems much more likely to play nicely with third-party uses of libxml, as seen in recent trouble reports about using Perl XML facilities in pl/perl and bug #4774 about contrib/xml2. I left the code for allocation redirection in place, but it's only built/used if you #define USE_LIBXMLCONTEXT. This is because I found it useful to corral libxml's allocations in a palloc context when hunting for libxml memory leaks, and we're surely going to have more of those in the future with this type of approach. But we don't want it turned on in a normal build because it breaks exactly what we need to fix. I have not re-indented most of the code sections that are now wrapped by PG_TRY(); that's for ease of review. pg_indent will fix it. This is a pre-existing bug in 8.3, but I don't dare back-patch this change until it's gotten a reasonable amount of field testing.
89 lines
2.9 KiB
C
89 lines
2.9 KiB
C
/*-------------------------------------------------------------------------
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*
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* xml.h
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* Declarations for XML data type support.
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*
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*
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* Portions Copyright (c) 1996-2009, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* $PostgreSQL: pgsql/src/include/utils/xml.h,v 1.26 2009/05/13 20:27:17 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef XML_H
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#define XML_H
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#include "fmgr.h"
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#include "nodes/execnodes.h"
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#include "nodes/primnodes.h"
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typedef struct varlena xmltype;
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#define DatumGetXmlP(X) ((xmltype *) PG_DETOAST_DATUM(X))
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#define XmlPGetDatum(X) PointerGetDatum(X)
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#define PG_GETARG_XML_P(n) DatumGetXmlP(PG_GETARG_DATUM(n))
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#define PG_RETURN_XML_P(x) PG_RETURN_POINTER(x)
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extern Datum xml_in(PG_FUNCTION_ARGS);
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extern Datum xml_out(PG_FUNCTION_ARGS);
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extern Datum xml_recv(PG_FUNCTION_ARGS);
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extern Datum xml_send(PG_FUNCTION_ARGS);
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extern Datum xmlcomment(PG_FUNCTION_ARGS);
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extern Datum xmlconcat2(PG_FUNCTION_ARGS);
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extern Datum texttoxml(PG_FUNCTION_ARGS);
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extern Datum xmltotext(PG_FUNCTION_ARGS);
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extern Datum xmlvalidate(PG_FUNCTION_ARGS);
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extern Datum xpath(PG_FUNCTION_ARGS);
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extern Datum table_to_xml(PG_FUNCTION_ARGS);
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extern Datum query_to_xml(PG_FUNCTION_ARGS);
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extern Datum cursor_to_xml(PG_FUNCTION_ARGS);
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extern Datum table_to_xmlschema(PG_FUNCTION_ARGS);
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extern Datum query_to_xmlschema(PG_FUNCTION_ARGS);
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extern Datum cursor_to_xmlschema(PG_FUNCTION_ARGS);
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extern Datum table_to_xml_and_xmlschema(PG_FUNCTION_ARGS);
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extern Datum query_to_xml_and_xmlschema(PG_FUNCTION_ARGS);
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extern Datum schema_to_xml(PG_FUNCTION_ARGS);
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extern Datum schema_to_xmlschema(PG_FUNCTION_ARGS);
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extern Datum schema_to_xml_and_xmlschema(PG_FUNCTION_ARGS);
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extern Datum database_to_xml(PG_FUNCTION_ARGS);
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extern Datum database_to_xmlschema(PG_FUNCTION_ARGS);
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extern Datum database_to_xml_and_xmlschema(PG_FUNCTION_ARGS);
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typedef enum
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{
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XML_STANDALONE_YES,
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XML_STANDALONE_NO,
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XML_STANDALONE_NO_VALUE,
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XML_STANDALONE_OMITTED
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} XmlStandaloneType;
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extern xmltype *xmlconcat(List *args);
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extern xmltype *xmlelement(XmlExprState *xmlExpr, ExprContext *econtext);
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extern xmltype *xmlparse(text *data, XmlOptionType xmloption, bool preserve_whitespace);
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extern xmltype *xmlpi(char *target, text *arg, bool arg_is_null, bool *result_is_null);
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extern xmltype *xmlroot(xmltype *data, text *version, int standalone);
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extern bool xml_is_document(xmltype *arg);
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extern text *xmltotext_with_xmloption(xmltype *data, XmlOptionType xmloption_arg);
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extern char *map_sql_identifier_to_xml_name(char *ident, bool fully_escaped, bool escape_period);
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extern char *map_xml_name_to_sql_identifier(char *name);
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extern char *map_sql_value_to_xml_value(Datum value, Oid type);
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typedef enum
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{
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XMLBINARY_BASE64,
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XMLBINARY_HEX
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} XmlBinaryType;
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extern int xmlbinary; /* XmlBinaryType, but int for guc enum */
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extern int xmloption; /* XmlOptionType, but int for guc enum */
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#endif /* XML_H */
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