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Change various Gin*Is* macros to return 0/1.

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Returning the direct result of bit arithmetic, in a macro intended to be
used in a boolean manner, can be problematic if the return value is
stored in a variable of type 'bool'. If bool is implemented using C99's
_Bool, that can lead to comparison failures if the variable is then
compared again with the expression (see ginStepRight() for an example
that fails), as _Bool forces the result to be 0/1. That happens in some
configurations of newer MSVC compilers.  It's also problematic when
storing the result of such an expression in a narrower type.

Several gin macros have been declared in that style since gin's initial
commit in 8a3631f8d8.

There's a lot more macros like this, but this is the only one causing
regression test failures; and I don't want to commit and backpatch a
larger patch with lots of conflicts just before the next set of minor
releases.

Discussion: 20150811154237.GD17575@awork2.anarazel.de
Backpatch: All supported branches
This commit is contained in:
Andres Freund
2016-03-27 17:47:48 +02:00
parent 7a68106ec5
commit 290cc21de4
1 changed files with 5 additions and 5 deletions
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10
src/include/access/gin_private.h
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@ -106,17 +106,17 @@ typedef struct GinMetaPageData
*/
#define GinPageGetOpaque(page) ( (GinPageOpaque) PageGetSpecialPointer(page) )
#define GinPageIsLeaf(page) ( GinPageGetOpaque(page)->flags & GIN_LEAF )
#define GinPageIsLeaf(page) ( (GinPageGetOpaque(page)->flags & GIN_LEAF) != 0 )
#define GinPageSetLeaf(page) ( GinPageGetOpaque(page)->flags |= GIN_LEAF )
#define GinPageSetNonLeaf(page) ( GinPageGetOpaque(page)->flags &= ~GIN_LEAF )
#define GinPageIsData(page) ( GinPageGetOpaque(page)->flags & GIN_DATA )
#define GinPageIsData(page) ( (GinPageGetOpaque(page)->flags & GIN_DATA) != 0 )
#define GinPageSetData(page) ( GinPageGetOpaque(page)->flags |= GIN_DATA )
#define GinPageIsList(page) ( GinPageGetOpaque(page)->flags & GIN_LIST )
#define GinPageIsList(page) ( (GinPageGetOpaque(page)->flags & GIN_LIST) != 0 )
#define GinPageSetList(page) ( GinPageGetOpaque(page)->flags |= GIN_LIST )
#define GinPageHasFullRow(page) ( GinPageGetOpaque(page)->flags & GIN_LIST_FULLROW )
#define GinPageHasFullRow(page) ( (GinPageGetOpaque(page)->flags & GIN_LIST_FULLROW) != 0 )
#define GinPageSetFullRow(page) ( GinPageGetOpaque(page)->flags |= GIN_LIST_FULLROW )
#define GinPageIsDeleted(page) ( GinPageGetOpaque(page)->flags & GIN_DELETED)
#define GinPageIsDeleted(page) ( (GinPageGetOpaque(page)->flags & GIN_DELETED) != 0 )
#define GinPageSetDeleted(page) ( GinPageGetOpaque(page)->flags |= GIN_DELETED)
#define GinPageSetNonDeleted(page) ( GinPageGetOpaque(page)->flags &= ~GIN_DELETED)