Quellcode-Bibliothek miscnodes.h

Sprache: C

/*-------------------------------------------------------------------------
*
* miscnodes.h
*   Definitions for hard-to-classify node types.
*
* Node types declared here are not part of parse trees, plan trees,
* or execution state trees.  We only assign them NodeTag values because
* IsA() tests provide a convenient way to disambiguate what kind of
* structure is being passed through assorted APIs, such as function
* "context" pointers.
*
*
* Portions Copyright (c) 1996-2025, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* src/include/nodes/miscnodes.h
*
*-------------------------------------------------------------------------
*/
#ifndef MISCNODES_H
#define MISCNODES_H

#include "nodes/nodes.h"

/*
* ErrorSaveContext -
*  function call context node for handling of "soft" errors
*
* A caller wishing to trap soft errors must initialize a struct like this
* with all fields zero/NULL except for the NodeTag.  Optionally, set
* details_wanted = true if more than the bare knowledge that a soft error
* occurred is required.  The struct is then passed to a SQL-callable function
* via the FunctionCallInfo.context field; or below the level of SQL calls,
* it could be passed to a subroutine directly.
*
* After calling code that might report an error this way, check
* error_occurred to see if an error happened.  If so, and if details_wanted
* is true, error_data has been filled with error details (stored in the
* callee's memory context!).  The ErrorData can be modified (e.g. downgraded
* to a WARNING) and reported with ThrowErrorData().  FreeErrorData() can be
* called to release error_data, although that step is typically not necessary
* if the called code was run in a short-lived context.
*/
typedef struct ErrorSaveContext
{
NodeTag  type;
bool  error_occurred; /* set to true if we detect a soft error */
bool  details_wanted; /* does caller want more info than that? */
ErrorData  *error_data;  /* details of error, if so */
} ErrorSaveContext;

/* Often-useful macro for checking if a soft error was reported */
#define SOFT_ERROR_OCCURRED(escontext) \
((escontext) != NULL && IsA(escontext, ErrorSaveContext) && \
  ((ErrorSaveContext *) (escontext))->error_occurred)

#endif       /* MISCNODES_H */

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