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Continuing work on adding full support for the SQLITE_OMIT_WSD

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compile-time option. (CVS 5658)

FossilOrigin-Name: ef26ea5c46d3915d206f8ff7f82a24f4c8955f1f
This commit is contained in:
drh
2008-09-02 00:52:52 +00:00
parent 171fa295c3
commit 78f82d1e6c
13 changed files with 252 additions and 145 deletions
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16
src/sqliteInt.h
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@@ -11,7 +11,7 @@
*************************************************************************
** Internal interface definitions for SQLite.
**
** @(#) $Id: sqliteInt.h,v 1.767 2008/09/01 21:59:43 shane Exp $
** @(#) $Id: sqliteInt.h,v 1.768 2008/09/02 00:52:52 drh Exp $
*/
#ifndef _SQLITEINT_H_
#define _SQLITEINT_H_
@@ -441,6 +441,20 @@ struct BusyHandler {
*/
#define SQLITE_DYNAMIC ((sqlite3_destructor_type)sqlite3DbFree)
/*
** When SQLITE_OMIT_WSD is defined, it means that the target platform does
** not support Writable Static Data (WSD) such as global and static variables.
** All variables must either be on the stack or dynamically allocated from
** the heap. When WSD is unsupported, the variable declarations scattered
** throughout the SQLite code must become constants instead. The SQLITE_WSD
** macro is used for this purpose. And instead of referencing the variable
** directly, we use its constant as a key to lookup the run-time allocated
** buffer that holds real variable. The constant is also the initializer
** for the run-time allocated buffer.
**
** In the usually case where WSD is supported, the SQLITE_WSD and GLOBAL
** macros become no-ops and have zero performance impact.
*/
#ifdef SQLITE_OMIT_WSD
#define SQLITE_WSD const
#define GLOBAL(t,v) (*(t*)sqlite3_wsd_find((void*)&(v), sizeof(v)))