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Introduce convenience macros to hide JsonbContainer header accesses better. 

This improves readability a bit and may make future improvements easier.

In passing, make sure that the JB_ROOT_IS_XXX macros deliver boolean (0/1)
results; the previous coding was a bug hazard, though no actual bugs are
known.

Nikita Glukhov, extended a bit by me

Discussion: https://postgr.es/m/9e21a39c-c1d7-b9b5-44a0-c5345a5029f6@postgrespro.ru
This commit is contained in:
Tom Lane 2017-01-25 13:28:38 -05:00
parent 049ac809a7
commit f7c6246240
3 changed files with 20 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
src/backend/utils/adt/jsonb_util.c
View File

@ -328,7 +328,7 @@ findJsonbValueFromContainer(JsonbContainer *container, uint32 flags,
JsonbValue *key)
{
JEntry *children = container->children;
int count = (container->header & JB_CMASK);
int count = JsonContainerSize(container);
JsonbValue *result;
Assert((flags & ~(JB_FARRAY | JB_FOBJECT)) == 0);
@ -339,7 +339,7 @@ findJsonbValueFromContainer(JsonbContainer *container, uint32 flags,
result = palloc(sizeof(JsonbValue));
if (flags & JB_FARRAY & container->header)
if ((flags & JB_FARRAY) && JsonContainerIsArray(container))
{
char *base_addr = (char *) (children + count);
uint32 offset = 0;
@ -358,7 +358,7 @@ findJsonbValueFromContainer(JsonbContainer *container, uint32 flags,
JBE_ADVANCE_OFFSET(offset, children[i]);
}
}
else if (flags & JB_FOBJECT & container->header)
else if ((flags & JB_FOBJECT) && JsonContainerIsObject(container))
{
/* Since this is an object, account for *Pairs* of Jentrys */
char *base_addr = (char *) (children + count * 2);
@ -422,10 +422,10 @@ getIthJsonbValueFromContainer(JsonbContainer *container, uint32 i)
char *base_addr;
uint32 nelements;
if ((container->header & JB_FARRAY) == 0)
if (!JsonContainerIsArray(container))
elog(ERROR, "not a jsonb array");
nelements = container->header & JB_CMASK;
nelements = JsonContainerSize(container);
base_addr = (char *) &container->children[nelements];
if (i >= nelements)
@ -904,7 +904,7 @@ iteratorFromContainer(JsonbContainer *container, JsonbIterator *parent)
it = palloc(sizeof(JsonbIterator));
it->container = container;
it->parent = parent;
it->nElems = container->header & JB_CMASK;
it->nElems = JsonContainerSize(container);
/* Array starts just after header */
it->children = container->children;
@ -914,7 +914,7 @@ iteratorFromContainer(JsonbContainer *container, JsonbIterator *parent)
case JB_FARRAY:
it->dataProper =
(char *) it->children + it->nElems * sizeof(JEntry);
it->isScalar = (container->header & JB_FSCALAR) != 0;
it->isScalar = JsonContainerIsScalar(container);
/* This is either a "raw scalar", or an array */
Assert(!it->isScalar || it->nElems == 1);

4
src/backend/utils/adt/jsonfuncs.c
View File

@ -1266,10 +1266,10 @@ get_jsonb_path_all(FunctionCallInfo fcinfo, bool as_text)
uint32 nelements;
/* Container must be array, but make sure */
if ((container->header & JB_FARRAY) == 0)
if (!JsonContainerIsArray(container))
elog(ERROR, "not a jsonb array");
nelements = container->header & JB_CMASK;
nelements = JsonContainerSize(container);
if (-lindex > nelements)
PG_RETURN_NULL();

16
src/include/utils/jsonb.h
View File

@ -205,6 +205,12 @@ typedef struct JsonbContainer
#define JB_FOBJECT 0x20000000
#define JB_FARRAY 0x40000000
/* convenience macros for accessing a JsonbContainer struct */
#define JsonContainerSize(jc) ((jc)->header & JB_CMASK)
#define JsonContainerIsScalar(jc) (((jc)->header & JB_FSCALAR) != 0)
#define JsonContainerIsObject(jc) (((jc)->header & JB_FOBJECT) != 0)
#define JsonContainerIsArray(jc) (((jc)->header & JB_FARRAY) != 0)
/* The top-level on-disk format for a jsonb datum. */
typedef struct
{
@ -213,10 +219,10 @@ typedef struct
} Jsonb;
/* convenience macros for accessing the root container in a Jsonb datum */
#define JB_ROOT_COUNT(jbp_) ( *(uint32*) VARDATA(jbp_) & JB_CMASK)
#define JB_ROOT_IS_SCALAR(jbp_) ( *(uint32*) VARDATA(jbp_) & JB_FSCALAR)
#define JB_ROOT_IS_OBJECT(jbp_) ( *(uint32*) VARDATA(jbp_) & JB_FOBJECT)
#define JB_ROOT_IS_ARRAY(jbp_) ( *(uint32*) VARDATA(jbp_) & JB_FARRAY)
#define JB_ROOT_COUNT(jbp_) (*(uint32 *) VARDATA(jbp_) & JB_CMASK)
#define JB_ROOT_IS_SCALAR(jbp_) ((*(uint32 *) VARDATA(jbp_) & JB_FSCALAR) != 0)
#define JB_ROOT_IS_OBJECT(jbp_) ((*(uint32 *) VARDATA(jbp_) & JB_FOBJECT) != 0)
#define JB_ROOT_IS_ARRAY(jbp_) ((*(uint32 *) VARDATA(jbp_) & JB_FARRAY) != 0)
enum jbvType
@ -241,7 +247,7 @@ enum jbvType
*/
struct JsonbValue
{
enum jbvType type; /* Influences sort order */
enum jbvType type; /* Influences sort order */
union
{