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Avoid useless malloc/free traffic around getFormattedTypeName().

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Coverity complained that one caller of getFormattedTypeName() failed
to free the returned string.  Which is true, but rather than fixing
that one, let's get rid of this tedious and error-prone requirement.
Now that getFormattedTypeName() caches its result, strdup'ing that
result and expecting the caller to free it accomplishes little except
to waste cycles.  We do create a leak in the case where getTypes didn't
make a TypeInfo for the type, but that basically shouldn't ever happen.

Back-patch, as commit 6c450a861 was.  This isn't a particularly
interesting bug fix, but the API change seems like a hazard for
future back-patching activity if we don't back-patch it.
pull/69/merge
Tom Lane 4 years ago
parent 490798451a
commit 072e2f8a62
1 changed files with 29 additions and 45 deletions
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
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  1. 74
      src/bin/pg_dump/pg_dump.c

74
src/bin/pg_dump/pg_dump.c
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@ -271,7 +271,7 @@ static char *convertRegProcReference(const char *proc);
static char *getFormattedOperatorName(const char *oproid);
static char *convertTSFunction(Archive *fout, Oid funcOid);
static Oid findLastBuiltinOid_V71(Archive *fout);
static char *getFormattedTypeName(Archive *fout, Oid oid, OidOptions opts);
static const char *getFormattedTypeName(Archive *fout, Oid oid, OidOptions opts);
static void getBlobs(Archive *fout);
static void dumpBlob(Archive *fout, const BlobInfo *binfo);
static int dumpBlobs(Archive *fout, const void *arg);
@ -11252,13 +11252,9 @@ dumpBaseType(Archive *fout, const TypeInfo *tyinfo)
appendPQExpBuffer(q, ",\n SUBSCRIPT = %s", typsubscript);
if (OidIsValid(tyinfo->typelem))
{
char *elemType;
elemType = getFormattedTypeName(fout, tyinfo->typelem, zeroIsError);
appendPQExpBuffer(q, ",\n ELEMENT = %s", elemType);
free(elemType);
}
appendPQExpBuffer(q, ",\n ELEMENT = %s",
getFormattedTypeName(fout, tyinfo->typelem,
zeroIsError));
if (strcmp(typcategory, "U") != 0)
{
@ -12062,7 +12058,7 @@ format_function_arguments_old(Archive *fout,
for (j = 0; j < nallargs; j++)
{
Oid typid;
char *typname;
const char *typname;
const char *argmode;
const char *argname;
@ -12101,7 +12097,6 @@ format_function_arguments_old(Archive *fout,
argname ? fmtId(argname) : "",
argname ? " " : "",
typname);
free(typname);
}
appendPQExpBufferChar(&fn, ')');
return fn.data;
@ -12130,15 +12125,12 @@ format_function_signature(Archive *fout, const FuncInfo *finfo, bool honor_quote
appendPQExpBuffer(&fn, "%s(", finfo->dobj.name);
for (j = 0; j < finfo->nargs; j++)
{
char *typname;
if (j > 0)
appendPQExpBufferStr(&fn, ", ");
typname = getFormattedTypeName(fout, finfo->argtypes[j],
zeroIsError);
appendPQExpBufferStr(&fn, typname);
free(typname);
appendPQExpBufferStr(&fn,
getFormattedTypeName(fout, finfo->argtypes[j],
zeroIsError));
}
appendPQExpBufferChar(&fn, ')');
return fn.data;
@ -12183,7 +12175,6 @@ dumpFunc(Archive *fout, const FuncInfo *finfo)
char *prosupport;
char *proparallel;
char *lanname;
char *rettypename;
int nallargs;
char **allargtypes = NULL;
char **argmodes = NULL;
@ -12473,14 +12464,10 @@ dumpFunc(Archive *fout, const FuncInfo *finfo)
else if (funcresult)
appendPQExpBuffer(q, " RETURNS %s", funcresult);
else
{
rettypename = getFormattedTypeName(fout, finfo->prorettype,
zeroIsError);
appendPQExpBuffer(q, " RETURNS %s%s",
(proretset[0] == 't') ? "SETOF " : "",
rettypename);
free(rettypename);
}
getFormattedTypeName(fout, finfo->prorettype,
zeroIsError));
appendPQExpBuffer(q, "\n LANGUAGE %s", fmtId(lanname));
@ -12687,8 +12674,8 @@ dumpCast(Archive *fout, const CastInfo *cast)
PQExpBuffer labelq;
PQExpBuffer castargs;
FuncInfo *funcInfo = NULL;
char *sourceType;
char *targetType;
const char *sourceType;
const char *targetType;
/* Skip if not to be dumped */
if (!cast->dobj.dump || dopt->dataOnly)
@ -12774,9 +12761,6 @@ dumpCast(Archive *fout, const CastInfo *cast)
NULL, "",
cast->dobj.catId, 0, cast->dobj.dumpId);
free(sourceType);
free(targetType);
destroyPQExpBuffer(defqry);
destroyPQExpBuffer(delqry);
destroyPQExpBuffer(labelq);
@ -12797,7 +12781,7 @@ dumpTransform(Archive *fout, const TransformInfo *transform)
FuncInfo *fromsqlFuncInfo = NULL;
FuncInfo *tosqlFuncInfo = NULL;
char *lanname;
char *transformType;
const char *transformType;
/* Skip if not to be dumped */
if (!transform->dobj.dump || dopt->dataOnly)
@ -12904,7 +12888,6 @@ dumpTransform(Archive *fout, const TransformInfo *transform)
transform->dobj.catId, 0, transform->dobj.dumpId);
free(lanname);
free(transformType);
destroyPQExpBuffer(defqry);
destroyPQExpBuffer(delqry);
destroyPQExpBuffer(labelq);
@ -14202,17 +14185,11 @@ format_aggregate_signature(const AggInfo *agginfo, Archive *fout, bool honor_quo
{
appendPQExpBufferChar(&buf, '(');
for (j = 0; j < agginfo->aggfn.nargs; j++)
{
char *typname;
typname = getFormattedTypeName(fout, agginfo->aggfn.argtypes[j],
zeroIsError);
appendPQExpBuffer(&buf, "%s%s",
(j > 0) ? ", " : "",
typname);
free(typname);
}
getFormattedTypeName(fout,
agginfo->aggfn.argtypes[j],
zeroIsError));
appendPQExpBufferChar(&buf, ')');
}
return buf.data;
@ -18885,8 +18862,10 @@ findDumpableDependencies(ArchiveHandle *AH, const DumpableObject *dobj,
*
* This does not guarantee to schema-qualify the output, so it should not
* be used to create the target object name for CREATE or ALTER commands.
*
* Note that the result is cached and must not be freed by the caller.
*/
static char *
static const char *
getFormattedTypeName(Archive *fout, Oid oid, OidOptions opts)
{
TypeInfo *typeInfo;
@ -18897,15 +18876,15 @@ getFormattedTypeName(Archive *fout, Oid oid, OidOptions opts)
if (oid == 0)
{
if ((opts & zeroAsStar) != 0)
return pg_strdup("*");
return "*";
else if ((opts & zeroAsNone) != 0)
return pg_strdup("NONE");
return "NONE";
}
/* see if we have the result cached in the type's TypeInfo record */
typeInfo = findTypeByOid(oid);
if (typeInfo && typeInfo->ftypname)
return pg_strdup(typeInfo->ftypname);
return typeInfo->ftypname;
query = createPQExpBuffer();
appendPQExpBuffer(query, "SELECT pg_catalog.format_type('%u'::pg_catalog.oid, NULL)",
@ -18919,9 +18898,14 @@ getFormattedTypeName(Archive *fout, Oid oid, OidOptions opts)
PQclear(res);
destroyPQExpBuffer(query);
/* cache a copy for later requests */
/*
* Cache the result for re-use in later requests, if possible. If we
* don't have a TypeInfo for the type, the string will be leaked once the
* caller is done with it ... but that case really should not happen, so
* leaking if it does seems acceptable.
*/
if (typeInfo)
typeInfo->ftypname = pg_strdup(result);
typeInfo->ftypname = result;
return result;
}

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