本篇内容介绍了“分析PostgreSQL CreateFunction中的ProcedureCreate函数”的有关知识，在实际案例的操作过程中，不少人都会遇到这样的困境，接下来就让小编带领大家学习一下如何处理这些情况吧！希望大家仔细阅读，能够学有所成！
Form_pg_language
plpgsql语言定义结构体
/* ----------------
* pg_language definition. cpp turns this into
* typedef struct FormData_pg_language
* ----------------
*/
CATALOG(pg_language,2612,LanguageRelationId)
{
Oid oid; /* oid */
/* Language name */
NameData lanname;
/* Language's owner */
Oid lanowner BKI_DEFAULT(PGUID);
/* Is a procedural language */
bool lanispl BKI_DEFAULT(f);
/* PL is trusted */
bool lanpltrusted BKI_DEFAULT(f);
/* Call handler, if it's a PL */
Oid lanplcallfoid BKI_DEFAULT(0) BKI_LOOKUP(pg_proc);
/* Optional anonymous-block handler function */
Oid laninline BKI_DEFAULT(0) BKI_LOOKUP(pg_proc);
/* Optional validation function */
Oid lanvalidator BKI_DEFAULT(0) BKI_LOOKUP(pg_proc);
#ifdef CATALOG_VARLEN /* variable-length fields start here */
/* Access privileges */
aclitem lanacl[1] BKI_DEFAULT(_null_);
#endif
} FormData_pg_language;
/* ----------------
* Form_pg_language corresponds to a pointer to a tuple with
* the format of pg_language relation.
* ----------------
*/
typedef FormData_pg_language *Form_pg_language;ArrayType
/*
* Arrays are varlena objects, so must meet the varlena convention that
* the first int32 of the object contains the total object size in bytes.
* Be sure to use VARSIZE() and SET_VARSIZE() to access it, though!
* Arrays是可变对象集，必须符合varlena约定，即对象的第一个int32包含对象的总大小（以字节为单位）。
* 但是，一定要确保使用VARSIZE和SET_VARSIZE函数范围该结构体
*
* CAUTION: if you change the header for ordinary arrays you will also
* need to change the headers for oidvector and int2vector!
*/
typedef struct
{
//可变的header
int32 vl_len_; /* varlena header (do not touch directly!) */
//维度
int ndim; /* # of dimensions */
//指向数据的偏移量,如为0则表示没有位图
int32 dataoffset; /* offset to data, or 0 if no bitmap */
//元素类型的OID
Oid elemtype; /* element type OID */
} ArrayType;DefElem
typedef struct DefElem
{
NodeTag type;
char *defnamespace; /* NULL if unqualified name */
char *defname;
Node *arg; /* a (Value *) or a (TypeName *) */
DefElemAction defaction; /* unspecified action, or SET/ADD/DROP */
int location; /* token location, or -1 if unknown */
} DefElem;FunctionParameter
typedef enum FunctionParameterMode
{
/* the assigned enum values appear in pg_proc, don't change 'em! */
FUNC_PARAM_IN = 'i', /* input only */
FUNC_PARAM_OUT = 'o', /* output only */
FUNC_PARAM_INOUT = 'b', /* both */
FUNC_PARAM_VARIADIC = 'v', /* variadic (always input) */
FUNC_PARAM_TABLE = 't' /* table function output column */
} FunctionParameterMode;
typedef struct FunctionParameter
{
NodeTag type;
char *name; /* parameter name, or NULL if not given */
TypeName *argType; /* TypeName for parameter type */
FunctionParameterMode mode; /* IN/OUT/etc */
Node *defexpr; /* raw default expr, or NULL if not given */
} FunctionParameter;/* ----------------------------------------------------------------
* ProcedureCreate
*
* Note: allParameterTypes, parameterModes, parameterNames, trftypes, and proconfig
* are either arrays of the proper types or NULL. We declare them Datum,
* not "ArrayType *", to avoid importing array.h into pg_proc.h.
* 注意: allParameterTypes, parameterModes, parameterNames, trftypes, and proconfig
* 要么为相应类型的数组,要么为NULL.这些变量的类型为Datum而不是ArrayType *,
* 目的是为了避免引入array.h到pg_proc.h中
* ----------------------------------------------------------------
*/
ObjectAddress
ProcedureCreate(const char *procedureName,
Oid procNamespace,
bool replace,
bool returnsSet,
Oid returnType,
Oid proowner,
Oid languageObjectId,
Oid languageValidator,
const char *prosrc,
const char *probin,
char prokind,
bool security_definer,
bool isLeakProof,
bool isStrict,
char volatility,
char parallel,
oidvector *parameterTypes,
Datum allParameterTypes,
Datum parameterModes,
Datum parameterNames,
List *parameterDefaults,
Datum trftypes,
Datum proconfig,
Oid prosupport,
float4 procost,
float4 prorows)
{
Oid retval;//返回值类型
int parameterCount;//输入参数
int allParamCount;//所有参数,如无输出参数,则为0
Oid *allParams;//所有参数类型,如无输出参数,则为NULL
char *paramModes = NULL;//参数类型
bool genericInParam = false;
bool genericOutParam = false;
bool anyrangeInParam = false;
bool anyrangeOutParam = false;
bool internalInParam = false;
bool internalOutParam = false;
Oid variadicType = InvalidOid;
Acl *proacl = NULL;//ACL结构体
Relation rel;//关系
HeapTuple tup;//tuple
HeapTuple oldtup;//原pg_proc tuple
bool nulls[Natts_pg_proc];//是否为null
Datum values[Natts_pg_proc];//值
bool replaces[Natts_pg_proc];//是否替换
NameData procname;//名称
TupleDesc tupDesc;//tuple描述符
bool is_update;//是否替换?
ObjectAddress myself,
referenced;
int i;//临时变量
Oid trfid;
/*
* sanity checks
*/
Assert(PointerIsValid(prosrc));
//参数个数
parameterCount = parameterTypes->dim1;
//#define FUNC_MAX_ARGS 100
if (parameterCount < 0 || parameterCount > FUNC_MAX_ARGS)
ereport(ERROR,
(errcode(ERRCODE_TOO_MANY_ARGUMENTS),
errmsg_plural("functions cannot have more than %d argument",
"functions cannot have more than %d arguments",
FUNC_MAX_ARGS,
FUNC_MAX_ARGS)));
/* note: the above is correct, we do NOT count output arguments(不计算输出参数) */
/* Deconstruct array inputs */
//重构数组输入:所有参数类型
if (allParameterTypes != PointerGetDatum(NULL))
{
/*
* We expect the array to be a 1-D OID array; verify that. We don't
* need to use deconstruct_array() since the array data is just going
* to look like a C array of OID values.
* 我们期望数组是一维OID数组,需要验证这一点.
* 因为数组中的数据看起来像是C语言中的OID数组,隐藏不需要使用deconstruct_array()函数
*/
ArrayType *allParamArray = (ArrayType *) DatumGetPointer(allParameterTypes);
//获取数组的维数
//#define ARR_DIMS(a) \
((int *) (((char *) (a)) + sizeof(ArrayType)))
//#define ARR_NDIM(a) ((a)->ndim)
//#define ARR_HASNULL(a) ((a)->dataoffset != 0)
allParamCount = ARR_DIMS(allParamArray)[0];
if (ARR_NDIM(allParamArray) != 1 ||
allParamCount <= 0 ||
ARR_HASNULL(allParamArray) ||
ARR_ELEMTYPE(allParamArray) != OIDOID)
elog(ERROR, "allParameterTypes is not a 1-D Oid array");
//所有参数
allParams = (Oid *) ARR_DATA_PTR(allParamArray);
Assert(allParamCount >= parameterCount);
/* we assume caller got the contents right */
}
else
{
//均为输入参数,无输出参数
allParamCount = parameterCount;
allParams = parameterTypes->values;
}
if (parameterModes != PointerGetDatum(NULL))
{
//参数模式(输入/输出等)
/*
* We expect the array to be a 1-D CHAR array; verify that. We don't
* need to use deconstruct_array() since the array data is just going
* to look like a C array of char values.
*/
ArrayType *modesArray = (ArrayType *) DatumGetPointer(parameterModes);
if (ARR_NDIM(modesArray) != 1 ||
ARR_DIMS(modesArray)[0] != allParamCount ||
ARR_HASNULL(modesArray) ||
ARR_ELEMTYPE(modesArray) != CHAROID)
elog(ERROR, "parameterModes is not a 1-D char array");
paramModes = (char *) ARR_DATA_PTR(modesArray);
}
/*
* Detect whether we have polymorphic or INTERNAL arguments. The first
* loop checks input arguments, the second output arguments.
* 检查是否存在多态或者INTERNAL参数.
* 两趟循环:第一趟检查输入参数,第二趟检查输出参数
*/
for (i = 0; i < parameterCount; i++)
{
switch (parameterTypes->values[i])
{
case ANYARRAYOID:
case ANYELEMENTOID:
case ANYNONARRAYOID:
case ANYENUMOID:
genericInParam = true;
break;
case ANYRANGEOID:
genericInParam = true;
anyrangeInParam = true;
break;
case INTERNALOID:
internalInParam = true;
break;
}
}
if (allParameterTypes != PointerGetDatum(NULL))
{
for (i = 0; i < allParamCount; i++)
{
if (paramModes == NULL ||
paramModes[i] == PROARGMODE_IN ||
paramModes[i] == PROARGMODE_VARIADIC)
continue; /* ignore input-only params */
switch (allParams[i])
{
case ANYARRAYOID:
case ANYELEMENTOID:
case ANYNONARRAYOID:
case ANYENUMOID:
genericOutParam = true;
break;
case ANYRANGEOID:
genericOutParam = true;
anyrangeOutParam = true;
break;
case INTERNALOID:
internalOutParam = true;
break;
}
}
}
/*
* Do not allow polymorphic return type unless at least one input argument
* is polymorphic. ANYRANGE return type is even stricter: must have an
* ANYRANGE input (since we can't deduce the specific range type from
* ANYELEMENT). Also, do not allow return type INTERNAL unless at least
* one input argument is INTERNAL.
* 至少存在一个多态输入参数的情况下才允许返回多态类型.
* ANYRANGE返回类型更为严格:必须含有一个ANYRANGE输入(因为无法从ANYELEMENT中规约特殊的范围类型.)
* 同时,除非至少有一个INTERNAL输入参数类型,否则不允许返回INTERNAL类型.
*/
if ((IsPolymorphicType(returnType) || genericOutParam)
&& !genericInParam)
ereport(ERROR,
(errcode(ERRCODE_INVALID_FUNCTION_DEFINITION),
errmsg("cannot determine result data type"),
errdetail("A function returning a polymorphic type must have at least one polymorphic argument.")));
if ((returnType == ANYRANGEOID || anyrangeOutParam) &&
!anyrangeInParam)
ereport(ERROR,
(errcode(ERRCODE_INVALID_FUNCTION_DEFINITION),
errmsg("cannot determine result data type"),
errdetail("A function returning \"anyrange\" must have at least one \"anyrange\" argument.")));
if ((returnType == INTERNALOID || internalOutParam) && !internalInParam)
ereport(ERROR,
(errcode(ERRCODE_INVALID_FUNCTION_DEFINITION),
errmsg("unsafe use of pseudo-type \"internal\""),
errdetail("A function returning \"internal\" must have at least one \"internal\" argument.")));
if (paramModes != NULL)
{
/*
* Only the last input parameter can be variadic; if it is, save its
* element type. Errors here are just elog since caller should have
* checked this already.
* 只有最后一个输入参数可以是variadic.如是,则存储元素类型.
*/
for (i = 0; i < allParamCount; i++)
{
switch (paramModes[i])
{
case PROARGMODE_IN:
case PROARGMODE_INOUT:
if (OidIsValid(variadicType))
elog(ERROR, "variadic parameter must be last");
break;
case PROARGMODE_OUT:
case PROARGMODE_TABLE:
/* okay */
break;
case PROARGMODE_VARIADIC:
if (OidIsValid(variadicType))
elog(ERROR, "variadic parameter must be last");
switch (allParams[i])
{
case ANYOID:
variadicType = ANYOID;
break;
case ANYARRAYOID:
variadicType = ANYELEMENTOID;
break;
default:
variadicType = get_element_type(allParams[i]);
if (!OidIsValid(variadicType))
elog(ERROR, "variadic parameter is not an array");
break;
}
break;
default:
elog(ERROR, "invalid parameter mode '%c'", paramModes[i]);
break;
}
}
}
/*
* All seems OK; prepare the data to be inserted into pg_proc.
* 检查完毕,写入到pg_proc中
*/
//#define Natts_pg_proc 29
for (i = 0; i < Natts_pg_proc; ++i)
{
nulls[i] = false;
values[i] = (Datum) 0;
replaces[i] = true;
}
//#define Anum_pg_proc_oid 1
//#define Anum_pg_proc_proname 2
//...
//#define Anum_pg_proc_proacl 29
namestrcpy(&procname, procedureName);
values[Anum_pg_proc_proname - 1] = NameGetDatum(&procname);
values[Anum_pg_proc_pronamespace - 1] = ObjectIdGetDatum(procNamespace);
values[Anum_pg_proc_proowner - 1] = ObjectIdGetDatum(proowner);
values[Anum_pg_proc_prolang - 1] = ObjectIdGetDatum(languageObjectId);
values[Anum_pg_proc_procost - 1] = Float4GetDatum(procost);
values[Anum_pg_proc_prorows - 1] = Float4GetDatum(prorows);
values[Anum_pg_proc_provariadic - 1] = ObjectIdGetDatum(variadicType);
values[Anum_pg_proc_prosupport - 1] = ObjectIdGetDatum(prosupport);
values[Anum_pg_proc_prokind - 1] = CharGetDatum(prokind);
values[Anum_pg_proc_prosecdef - 1] = BoolGetDatum(security_definer);
values[Anum_pg_proc_proleakproof - 1] = BoolGetDatum(isLeakProof);
values[Anum_pg_proc_proisstrict - 1] = BoolGetDatum(isStrict);
values[Anum_pg_proc_proretset - 1] = BoolGetDatum(returnsSet);
values[Anum_pg_proc_provolatile - 1] = CharGetDatum(volatility);
values[Anum_pg_proc_proparallel - 1] = CharGetDatum(parallel);
values[Anum_pg_proc_pronargs - 1] = UInt16GetDatum(parameterCount);
values[Anum_pg_proc_pronargdefaults - 1] = UInt16GetDatum(list_length(parameterDefaults));
values[Anum_pg_proc_prorettype - 1] = ObjectIdGetDatum(returnType);
values[Anum_pg_proc_proargtypes - 1] = PointerGetDatum(parameterTypes);
if (allParameterTypes != PointerGetDatum(NULL))
values[Anum_pg_proc_proallargtypes - 1] = allParameterTypes;
else
nulls[Anum_pg_proc_proallargtypes - 1] = true;
if (parameterModes != PointerGetDatum(NULL))
values[Anum_pg_proc_proargmodes - 1] = parameterModes;
else
nulls[Anum_pg_proc_proargmodes - 1] = true;
if (parameterNames != PointerGetDatum(NULL))
values[Anum_pg_proc_proargnames - 1] = parameterNames;
else
nulls[Anum_pg_proc_proargnames - 1] = true;
if (parameterDefaults != NIL)
values[Anum_pg_proc_proargdefaults - 1] = CStringGetTextDatum(nodeToString(parameterDefaults));
else
nulls[Anum_pg_proc_proargdefaults - 1] = true;
if (trftypes != PointerGetDatum(NULL))
values[Anum_pg_proc_protrftypes - 1] = trftypes;
else
nulls[Anum_pg_proc_protrftypes - 1] = true;
values[Anum_pg_proc_prosrc - 1] = CStringGetTextDatum(prosrc);
if (probin)
values[Anum_pg_proc_probin - 1] = CStringGetTextDatum(probin);
else
nulls[Anum_pg_proc_probin - 1] = true;
if (proconfig != PointerGetDatum(NULL))
values[Anum_pg_proc_proconfig - 1] = proconfig;
else
nulls[Anum_pg_proc_proconfig - 1] = true;
/* proacl will be determined later */
rel = table_open(ProcedureRelationId, RowExclusiveLock);
tupDesc = RelationGetDescr(rel);
/* Check for pre-existing definition */
//检查是否已存在
oldtup = SearchSysCache3(PROCNAMEARGSNSP,
PointerGetDatum(procedureName),
PointerGetDatum(parameterTypes),
ObjectIdGetDatum(procNamespace));
if (HeapTupleIsValid(oldtup))
{
//-------- 已存在
/* There is one; okay to replace it? */
//获取原记录(pg_proc记录)
Form_pg_proc oldproc = (Form_pg_proc) GETSTRUCT(oldtup);
Datum proargnames;
bool isnull;
const char *dropcmd;
if (!replace)
ereport(ERROR,
(errcode(ERRCODE_DUPLICATE_FUNCTION),
errmsg("function \"%s\" already exists with same argument types",
procedureName)));
if (!pg_proc_ownercheck(oldproc->oid, proowner))
aclcheck_error(ACLCHECK_NOT_OWNER, OBJECT_FUNCTION,
procedureName);
/* Not okay to change routine kind */
//不能改变类型(如原来是proc,那么创建同名func是不行的)
if (oldproc->prokind != prokind)
ereport(ERROR,
(errcode(ERRCODE_WRONG_OBJECT_TYPE),
errmsg("cannot change routine kind"),
(oldproc->prokind == PROKIND_AGGREGATE ?
errdetail("\"%s\" is an aggregate function.", procedureName) :
oldproc->prokind == PROKIND_FUNCTION ?
errdetail("\"%s\" is a function.", procedureName) :
oldproc->prokind == PROKIND_PROCEDURE ?
errdetail("\"%s\" is a procedure.", procedureName) :
oldproc->prokind == PROKIND_WINDOW ?
errdetail("\"%s\" is a window function.", procedureName) :
0)));
dropcmd = (prokind == PROKIND_PROCEDURE ? "DROP PROCEDURE" :
prokind == PROKIND_AGGREGATE ? "DROP AGGREGATE" :
"DROP FUNCTION");
/*
* Not okay to change the return type of the existing proc, since
* existing rules, views, etc may depend on the return type.
* 改变返回类型也是不行的,因为现存的规则\视图等等可能依赖返回类型.
*
* In case of a procedure, a changing return type means that whether
* the procedure has output parameters was changed. Since there is no
* user visible return type, we produce a more specific error message.
* 如为存储过程,改变返回类型意味着过程已有的输出参数已改变.
* 由于存在非用户可见返回类型,隐藏产生更为详尽的错误信息.
*/
if (returnType != oldproc->prorettype ||
returnsSet != oldproc->proretset)
ereport(ERROR,
(errcode(ERRCODE_INVALID_FUNCTION_DEFINITION),
prokind == PROKIND_PROCEDURE
? errmsg("cannot change whether a procedure has output parameters")
: errmsg("cannot change return type of existing function"),
/*
* translator: first %s is DROP FUNCTION, DROP PROCEDURE, or DROP
* AGGREGATE
*/
errhint("Use %s %s first.",
dropcmd,
format_procedure(oldproc->oid))));
/*
* If it returns RECORD, check for possible change of record type
* implied by OUT parameters
* 如果返回RECORD类型,检查使用OUT参数指明的可能的record类型变化.
*/
if (returnType == RECORDOID)
{
//返回RECORD类型
TupleDesc olddesc;
TupleDesc newdesc;
olddesc = build_function_result_tupdesc_t(oldtup);
newdesc = build_function_result_tupdesc_d(prokind,
allParameterTypes,
parameterModes,
parameterNames);
if (olddesc == NULL && newdesc == NULL)
/* ok, both are runtime-defined RECORDs */ ;
else if (olddesc == NULL || newdesc == NULL ||
!equalTupleDescs(olddesc, newdesc))
ereport(ERROR,
(errcode(ERRCODE_INVALID_FUNCTION_DEFINITION),
errmsg("cannot change return type of existing function"),
errdetail("Row type defined by OUT parameters is different."),
/* translator: first %s is DROP FUNCTION or DROP PROCEDURE */
errhint("Use %s %s first.",
dropcmd,
format_procedure(oldproc->oid))));
}
/*
* If there were any named input parameters, check to make sure the
* names have not been changed, as this could break existing calls. We
* allow adding names to formerly unnamed parameters, though.
* 如存在已命名的输入参数,确保名称没有变更,否则会破坏现存的调用.
* 但允许添加名称到未命名的参数中.
*/
proargnames = SysCacheGetAttr(PROCNAMEARGSNSP, oldtup,
Anum_pg_proc_proargnames,
&isnull);
if (!isnull)
{
Datum proargmodes;
char **old_arg_names;
char **new_arg_names;
int n_old_arg_names;
int n_new_arg_names;
int j;
proargmodes = SysCacheGetAttr(PROCNAMEARGSNSP, oldtup,
Anum_pg_proc_proargmodes,
&isnull);
if (isnull)
proargmodes = PointerGetDatum(NULL); /* just to be sure */
n_old_arg_names = get_func_input_arg_names(proargnames,
proargmodes,
&old_arg_names);
n_new_arg_names = get_func_input_arg_names(parameterNames,
parameterModes,
&new_arg_names);
for (j = 0; j < n_old_arg_names; j++)
{
if (old_arg_names[j] == NULL)
continue;
if (j >= n_new_arg_names || new_arg_names[j] == NULL ||
strcmp(old_arg_names[j], new_arg_names[j]) != 0)
ereport(ERROR,
(errcode(ERRCODE_INVALID_FUNCTION_DEFINITION),
errmsg("cannot change name of input parameter \"%s\"",
old_arg_names[j]),
/* translator: first %s is DROP FUNCTION or DROP PROCEDURE */
errhint("Use %s %s first.",
dropcmd,
format_procedure(oldproc->oid))));
}
}
/*
* If there are existing defaults, check compatibility: redefinition
* must not remove any defaults nor change their types. (Removing a
* default might cause a function to fail to satisfy an existing call.
* Changing type would only be possible if the associated parameter is
* polymorphic, and in such cases a change of default type might alter
* the resolved output type of existing calls.)
* 存在defaults(默认参数),检查兼容性:
* 重新定义不应删去已有的默认定义或者改变类型,否则会破坏现存的调用.
*/
if (oldproc->pronargdefaults != 0)
{
//默认值判断
Datum proargdefaults;
List *oldDefaults;
ListCell *oldlc;
ListCell *newlc;
if (list_length(parameterDefaults) < oldproc->pronargdefaults)
ereport(ERROR,
(errcode(ERRCODE_INVALID_FUNCTION_DEFINITION),
errmsg("cannot remove parameter defaults from existing function"),
/* translator: first %s is DROP FUNCTION or DROP PROCEDURE */
errhint("Use %s %s first.",
dropcmd,
format_procedure(oldproc->oid))));
proargdefaults = SysCacheGetAttr(PROCNAMEARGSNSP, oldtup,
Anum_pg_proc_proargdefaults,
&isnull);
Assert(!isnull);
oldDefaults = castNode(List, stringToNode(TextDatumGetCString(proargdefaults)));
Assert(list_length(oldDefaults) == oldproc->pronargdefaults);
/* new list can have more defaults than old, advance over 'em */
newlc = list_head(parameterDefaults);
for (i = list_length(parameterDefaults) - oldproc->pronargdefaults;
i > 0;
i--)
newlc = lnext(newlc);
foreach(oldlc, oldDefaults)
{
Node *oldDef = (Node *) lfirst(oldlc);
Node *newDef = (Node *) lfirst(newlc);
if (exprType(oldDef) != exprType(newDef))
ereport(ERROR,
(errcode(ERRCODE_INVALID_FUNCTION_DEFINITION),
errmsg("cannot change data type of existing parameter default value"),
/* translator: first %s is DROP FUNCTION or DROP PROCEDURE */
errhint("Use %s %s first.",
dropcmd,
format_procedure(oldproc->oid))));
newlc = lnext(newlc);
}
}
/*
* Do not change existing oid, ownership or permissions, either. Note
* dependency-update code below has to agree with this decision.
* 不改变现有的oid,宿主或者权限等.
* 注意下面的依赖更新代码必须遵循这一约定.
*/
replaces[Anum_pg_proc_oid - 1] = false;
replaces[Anum_pg_proc_proowner - 1] = false;
replaces[Anum_pg_proc_proacl - 1] = false;
/* Okay, do it... */
tup = heap_modify_tuple(oldtup, tupDesc, values, nulls, replaces);
CatalogTupleUpdate(rel, &tup->t_self, tup);
ReleaseSysCache(oldtup);
is_update = true;
}
else
{
//-------------- 不存在
/* Creating a new procedure */
//创建新的过程
Oid newOid;
/* First, get default permissions and set up proacl */
//首先:获取默认的权限并设置proacl
proacl = get_user_default_acl(OBJECT_FUNCTION, proowner,
procNamespace);
if (proacl != NULL)
values[Anum_pg_proc_proacl - 1] = PointerGetDatum(proacl);
else
nulls[Anum_pg_proc_proacl - 1] = true;
//获取新的OID
newOid = GetNewOidWithIndex(rel, ProcedureOidIndexId,
Anum_pg_proc_oid);
//设置pg_proc中的OID
values[Anum_pg_proc_oid - 1] = ObjectIdGetDatum(newOid);
//构造tuple
tup = heap_form_tuple(tupDesc, values, nulls);
//执行插入操作
CatalogTupleInsert(rel, tup);
is_update = false;
}
//获取pg_proc结构体
retval = ((Form_pg_proc) GETSTRUCT(tup))->oid;
/*
* Create dependencies for the new function. If we are updating an
* existing function, first delete any existing pg_depend entries.
* (However, since we are not changing ownership or permissions, the
* shared dependencies do *not* need to change, and we leave them alone.)
* 创建新函数的依赖.
* 如正在更新现存的函数,首先删除现存的pg_depend条目.
*/
if (is_update)
//删除依赖
deleteDependencyRecordsFor(ProcedureRelationId, retval, true);
myself.classId = ProcedureRelationId;
myself.objectId = retval;
myself.objectSubId = 0;
/* dependency on namespace */
//依赖:namespace
referenced.classId = NamespaceRelationId;
referenced.objectId = procNamespace;
referenced.objectSubId = 0;
recordDependencyOn(&myself, &referenced, DEPENDENCY_NORMAL);
/* dependency on implementation language */
//依赖:语言
referenced.classId = LanguageRelationId;
referenced.objectId = languageObjectId;
referenced.objectSubId = 0;
recordDependencyOn(&myself, &referenced, DEPENDENCY_NORMAL);
/* dependency on return type */
//依赖:返回类型
referenced.classId = TypeRelationId;
referenced.objectId = returnType;
referenced.objectSubId = 0;
recordDependencyOn(&myself, &referenced, DEPENDENCY_NORMAL);
/* dependency on transform used by return type, if any */
//依赖:返回类型的转换规则
if ((trfid = get_transform_oid(returnType, languageObjectId, true)))
{
referenced.classId = TransformRelationId;
referenced.objectId = trfid;
referenced.objectSubId = 0;
recordDependencyOn(&myself, &referenced, DEPENDENCY_NORMAL);
}
/* dependency on parameter types */
//依赖:参数类型
for (i = 0; i < allParamCount; i++)
{
referenced.classId = TypeRelationId;
referenced.objectId = allParams[i];
referenced.objectSubId = 0;
recordDependencyOn(&myself, &referenced, DEPENDENCY_NORMAL);
/* dependency on transform used by parameter type, if any */
if ((trfid = get_transform_oid(allParams[i], languageObjectId, true)))
{
referenced.classId = TransformRelationId;
referenced.objectId = trfid;
referenced.objectSubId = 0;
recordDependencyOn(&myself, &referenced, DEPENDENCY_NORMAL);
}
}
/* dependency on parameter default expressions */
//依赖:默认表达式
if (parameterDefaults)
recordDependencyOnExpr(&myself, (Node *) parameterDefaults,
NIL, DEPENDENCY_NORMAL);
/* dependency on support function, if any */
//依赖:支持的函数
if (OidIsValid(prosupport))
{
referenced.classId = ProcedureRelationId;
referenced.objectId = prosupport;
referenced.objectSubId = 0;
recordDependencyOn(&myself, &referenced, DEPENDENCY_NORMAL);
}
/* dependency on owner */
//依赖:owner
if (!is_update)
recordDependencyOnOwner(ProcedureRelationId, retval, proowner);
/* dependency on any roles mentioned in ACL */
//依赖:ACL中标明的角色
if (!is_update)
recordDependencyOnNewAcl(ProcedureRelationId, retval, 0,
proowner, proacl);
/* dependency on extension */
//依赖:扩展
recordDependencyOnCurrentExtension(&myself, is_update);
heap_freetuple(tup);
/* Post creation hook for new function */
//调用对象创建后的钩子函数
InvokeObjectPostCreateHook(ProcedureRelationId, retval, 0);
//关闭pg_proc
table_close(rel, RowExclusiveLock);
/* Verify function body */
//验证函数body
if (OidIsValid(languageValidator))
{
ArrayType *set_items = NULL;
int save_nestlevel = 0;
/* Advance command counter so new tuple can be seen by validator */
//增加命令计数
CommandCounterIncrement();
/*
* Set per-function configuration parameters so that the validation is
* done with the environment the function expects. However, if
* check_function_bodies is off, we don't do this, because that would
* create dump ordering hazards that pg_dump doesn't know how to deal
* with. (For example, a SET clause might refer to a not-yet-created
* text search configuration.) This means that the validator
* shouldn't complain about anything that might depend on a GUC
* parameter when check_function_bodies is off.
*/
if (check_function_bodies)
{
//检查函数体
//获取函数设定的参数
set_items = (ArrayType *) DatumGetPointer(proconfig);
if (set_items) /* Need a new GUC nesting level */
{
save_nestlevel = NewGUCNestLevel();
ProcessGUCArray(set_items,
(superuser() ? PGC_SUSET : PGC_USERSET),
PGC_S_SESSION,
GUC_ACTION_SAVE);
}
}
//调用语言校验器
OidFunctionCall1(languageValidator, ObjectIdGetDatum(retval));
if (set_items)
AtEOXact_GUC(true, save_nestlevel);
}
return myself;
}测试脚本
create or replace function func_test(pi_v1 in int,pi_v2 varchar,pio_v3 inout varchar,po_v4 out int,po_v5 out varchar) returns record as $$ declare begin raise notice 'pi_v1 := %,pi_v2 := %,pi_v3 := %',pi_v1,pi_v2,pio_v3; pio_v3 := 'pio_v3 i/o'; po_v4 := 100; po_v5 := 'po_v5 out'; end; $$ LANGUAGE plpgsql;
启动GDB跟踪
(gdb) b ProcedureCreate Breakpoint 1 at 0x5bd665: file pg_proc.c, line 99. (gdb) c Continuing. Breakpoint 1, ProcedureCreate (procedureName=0x1173ab0 "func_test", procNamespace=2200, replace=true, returnsSet=false, returnType=2249, proowner=10, languageObjectId=13581, languageValidator=13580, prosrc=0x11745c8 "\ndeclare\nbegin\n raise notice 'pi_v1 := %,pi_v2 := %,pi_v3 := %',pi_v1,pi_v2,pio_v3;\n pio_v3 := 'pio_v3 i/o';\n po_v4 := 100;\n po_v5 := 'po_v5 out';\nend;\n", probin=0x0, prokind=102 'f', security_definer=false, isLeakProof=false, isStrict=false, volatility=118 'v', parallel=117 'u', parameterTypes=0x119a3d0, allParameterTypes=18458616, parameterModes=18457432, parameterNames=18456792, parameterDefaults=0x0, trftypes=0, proconfig=0, prosupport=0, procost=100, prorows=0) at pg_proc.c:99 99 char *paramModes = NULL; (gdb)
输入参数
[local:/data/run/pg12]:5120 pg12@testdb=# \d pg_type Table "pg_catalog.pg_type" Column | Type | Collation | Nullable | Default ----------------+--------------+-----------+----------+--------- oid | oid | | not null | typname | name | | not null | typnamespace | oid | | not null | typowner | oid | | not null | typlen | smallint | | not null | typbyval | boolean | | not null | typtype | "char" | | not null | typcategory | "char" | | not null | typispreferred | boolean | | not null | typisdefined | boolean | | not null | typdelim | "char" | | not null | typrelid | oid | | not null | typelem | oid | | not null | typarray | oid | | not null | typinput | regproc | | not null | typoutput | regproc | | not null | typreceive | regproc | | not null | [local:/data/run/pg12]:5120 pg12@testdb=# select oid,typname from pg_type where oid=2249; oid | typname ------+--------- 2249 | record (1 row) [local:/data/run/pg12]:5120 pg12@testdb=# \d pg_namespace Table "pg_catalog.pg_namespace" Column | Type | Collation | Nullable | Default ----------+-----------+-----------+----------+--------- oid | oid | | not null | nspname | name | | not null | nspowner | oid | | not null | nspacl | aclitem[] | | | Indexes: "pg_namespace_nspname_index" UNIQUE, btree (nspname) "pg_namespace_oid_index" UNIQUE, btree (oid) [local:/data/run/pg12]:5120 pg12@testdb=# select oid,nspname from pg_namespace where oid=2200; oid | nspname ------+--------- 2200 | public (1 row) [local:/data/run/pg12]:5120 pg12@testdb=# \d pg_user View "pg_catalog.pg_user" Column | Type | Collation | Nullable | Default --------------+--------------------------+-----------+----------+--------- usename | name | | | usesysid | oid | | | usecreatedb | boolean | | | usesuper | boolean | | | userepl | boolean | | | usebypassrls | boolean | | | passwd | text | | | valuntil | timestamp with time zone | | | useconfig | text[] | C | | [local:/data/run/pg12]:5120 pg12@testdb=# select usename,usesysid from pg_user where usesysid=10; usename | usesysid ---------+---------- pg12 | 10 (1 row) [local:/data/run/pg12]:5120 pg12@testdb=# \d pg_language Table "pg_catalog.pg_language" Column | Type | Collation | Nullable | Default ---------------+-----------+-----------+----------+--------- oid | oid | | not null | lanname | name | | not null | lanowner | oid | | not null | lanispl | boolean | | not null | lanpltrusted | boolean | | not null | lanplcallfoid | oid | | not null | laninline | oid | | not null | lanvalidator | oid | | not null | lanacl | aclitem[] | | | Indexes: "pg_language_name_index" UNIQUE, btree (lanname) "pg_language_oid_index" UNIQUE, btree (oid) [local:/data/run/pg12]:5120 pg12@testdb=# select oid,lanname,lanowner from pg_language where oid=13581; oid | lanname | lanowner -------+---------+---------- 13581 | plpgsql | 10 (1 row)
初始化本地临时变量
99 char *paramModes = NULL; (gdb) n 100 bool genericInParam = false; (gdb) 101 bool genericOutParam = false; (gdb) 102 bool anyrangeInParam = false; (gdb) 103 bool anyrangeOutParam = false; (gdb) 104 bool internalInParam = false; (gdb) 105 bool internalOutParam = false; (gdb) 106 Oid variadicType = InvalidOid; (gdb) 107 Acl *proacl = NULL; (gdb) 125 Assert(PointerIsValid(prosrc)); (gdb) 127 parameterCount = parameterTypes->dim1; (gdb)
获取参数个数(3个输入参数,类型为26-oid,数据类型为int4,varchar,varchar)
(gdb) n
128 if (parameterCount < 0 || parameterCount > FUNC_MAX_ARGS)
(gdb) p parameterCount
$1 = 3
(gdb) p *parameterTypes
$2 = {vl_len_ = 144, ndim = 1, dataoffset = 0, elemtype = 26, dim1 = 3, lbound1 = 0,
values = 0x119a3e8}
(gdb)
(gdb) p *parameterTypes->values
$3 = 23
(gdb) p parameterTypes->values[1]
$4 = 1043
(gdb) p parameterTypes->values[2]
$5 = 1043
(gdb)
###
[local:/data/run/pg12]:5120 pg12@testdb=# select oid,typname from pg_type where oid=26;
oid | typname
-----+---------
26 | oid
(1 row)
[local:/data/run/pg12]:5120 pg12@testdb=# select oid,typname from pg_type where oid in (23,1043);
oid | typname
------+---------
23 | int4
1043 | varchar
(2 rows)重构数组输入:所有参数类型
(gdb) n
138 if (allParameterTypes != PointerGetDatum(NULL))
(gdb)
145 ArrayType *allParamArray = (ArrayType *) DatumGetPointer(allParameterTypes);
(gdb)
147 allParamCount = ARR_DIMS(allParamArray)[0];
(gdb)
148 if (ARR_NDIM(allParamArray) != 1 ||
(gdb)
150 ARR_HASNULL(allParamArray) ||
(gdb)
149 allParamCount <= 0 ||
(gdb)
151 ARR_ELEMTYPE(allParamArray) != OIDOID)
(gdb)
150 ARR_HASNULL(allParamArray) ||
(gdb)
153 allParams = (Oid *) ARR_DATA_PTR(allParamArray);
(gdb)
154 Assert(allParamCount >= parameterCount);
(gdb) p *allParamArray
$6 = {vl_len_ = 176, ndim = 1, dataoffset = 0, elemtype = 26}
(gdb) p allParamArray[1]
$7 = {vl_len_ = 5, ndim = 1, dataoffset = 23, elemtype = 1043}
(gdb) p allParamCount
$8 = 5
(gdb) p *ARR_DIMS(allParamArray)
$9 = 5
(gdb) p allParamArray[2]
$10 = {vl_len_ = 1043, ndim = 23, dataoffset = 1043, elemtype = 2139062142}
(gdb) p allParamArray[3]
$11 = {vl_len_ = 2139062143, ndim = 2139062143, dataoffset = 2139062143,
elemtype = 2139062143}
(gdb) n
163 if (parameterModes != PointerGetDatum(NULL))
(gdb)处理参数模式:参数模式(输入/输出等),分别是i,i,b,o,o
(gdb) n 170 ArrayType *modesArray = (ArrayType *) DatumGetPointer(parameterModes); (gdb) 172 if (ARR_NDIM(modesArray) != 1 || (gdb) 173 ARR_DIMS(modesArray)[0] != allParamCount || (gdb) 172 if (ARR_NDIM(modesArray) != 1 || (gdb) 174 ARR_HASNULL(modesArray) || (gdb) 173 ARR_DIMS(modesArray)[0] != allParamCount || (gdb) 175 ARR_ELEMTYPE(modesArray) != CHAROID) (gdb) 174 ARR_HASNULL(modesArray) || (gdb) 177 paramModes = (char *) ARR_DATA_PTR(modesArray); (gdb) 184 for (i = 0; i < parameterCount; i++) (gdb) p paramModes[0] $12 = 105 'i' (gdb) p paramModes[1] $13 = 105 'i' (gdb) p paramModes[2] $14 = 98 'b' (gdb) p paramModes[3] $15 = 111 'o' (gdb) p paramModes[4] $16 = 111 'o' (gdb)
检查是否存在多态或者INTERNAL参数.
两趟循环:第一趟检查输入参数,第二趟检查输出参数
(gdb) n 186 switch (parameterTypes->values[i]) (gdb) 184 for (i = 0; i < parameterCount; i++) (gdb) 186 switch (parameterTypes->values[i]) (gdb) 184 for (i = 0; i < parameterCount; i++) (gdb) 186 switch (parameterTypes->values[i]) (gdb) 184 for (i = 0; i < parameterCount; i++) (gdb) 204 if (allParameterTypes != PointerGetDatum(NULL)) (gdb) 206 for (i = 0; i < allParamCount; i++) (gdb) 208 if (paramModes == NULL || (gdb) 209 paramModes[i] == PROARGMODE_IN || (gdb) 208 if (paramModes == NULL || (gdb) 211 continue; /* ignore input-only params */ (gdb) 206 for (i = 0; i < allParamCount; i++) (gdb) 208 if (paramModes == NULL || (gdb) 209 paramModes[i] == PROARGMODE_IN || (gdb) 208 if (paramModes == NULL || (gdb) 211 continue; /* ignore input-only params */ (gdb) 206 for (i = 0; i < allParamCount; i++) (gdb) 208 if (paramModes == NULL || (gdb) 209 paramModes[i] == PROARGMODE_IN || (gdb) 208 if (paramModes == NULL || (gdb) 210 paramModes[i] == PROARGMODE_VARIADIC) (gdb) 209 paramModes[i] == PROARGMODE_IN || (gdb) 213 switch (allParams[i]) (gdb) 206 for (i = 0; i < allParamCount; i++) (gdb) 208 if (paramModes == NULL || (gdb) 209 paramModes[i] == PROARGMODE_IN || (gdb) 208 if (paramModes == NULL || (gdb) 210 paramModes[i] == PROARGMODE_VARIADIC) (gdb) 209 paramModes[i] == PROARGMODE_IN || (gdb) 213 switch (allParams[i]) (gdb) 206 for (i = 0; i < allParamCount; i++) (gdb) 208 if (paramModes == NULL || (gdb) p allParamCount $17 = 5 (gdb) n 209 paramModes[i] == PROARGMODE_IN || (gdb) 208 if (paramModes == NULL || (gdb) 210 paramModes[i] == PROARGMODE_VARIADIC) (gdb) 209 paramModes[i] == PROARGMODE_IN || (gdb) 213 switch (allParams[i]) (gdb) 206 for (i = 0; i < allParamCount; i++) (gdb) 239 if ((IsPolymorphicType(returnType) || genericOutParam) (gdb)
至少存在一个多态输入参数的情况下才允许返回多态类型.
ANYRANGE返回类型更为严格:必须含有一个ANYRANGE输入(因为无法从ANYELEMENT中规约特殊的范围类型.)
同时,除非至少有一个INTERNAL输入参数类型,否则不允许返回INTERNAL类型.
(gdb) n 246 if ((returnType == ANYRANGEOID || anyrangeOutParam) && (gdb) 253 if ((returnType == INTERNALOID || internalOutParam) && !internalInParam) (gdb) 259 if (paramModes != NULL) (gdb)
只有最后一个输入参数可以是variadic.如是,则存储元素类型.
266 for (i = 0; i < allParamCount; i++) (gdb) n 268 switch (paramModes[i]) (gdb) 272 if (OidIsValid(variadicType)) (gdb) 274 break; (gdb) 266 for (i = 0; i < allParamCount; i++) (gdb) 268 switch (paramModes[i]) (gdb) 272 if (OidIsValid(variadicType)) (gdb) 274 break; (gdb) 266 for (i = 0; i < allParamCount; i++) (gdb) 268 switch (paramModes[i]) (gdb) 272 if (OidIsValid(variadicType)) (gdb) 274 break; (gdb) 266 for (i = 0; i < allParamCount; i++) (gdb) 268 switch (paramModes[i]) (gdb) 278 break; (gdb) 266 for (i = 0; i < allParamCount; i++) (gdb) 268 switch (paramModes[i]) (gdb) 278 break; (gdb) 266 for (i = 0; i < allParamCount; i++) (gdb) 308 for (i = 0; i < Natts_pg_proc; ++i) (gdb)
检查完毕,写入到pg_proc中,初始化values
308 for (i = 0; i < Natts_pg_proc; ++i) (gdb) 310 nulls[i] = false; (gdb) 311 values[i] = (Datum) 0; (gdb) 312 replaces[i] = true; (gdb) ...
赋值
308 for (i = 0; i < Natts_pg_proc; ++i) (gdb) 315 namestrcpy(&procname, procedureName); (gdb) 316 values[Anum_pg_proc_proname - 1] = NameGetDatum(&procname); (gdb) p procedureName $20 = 0x1173ab0 "func_test" (gdb) n 317 values[Anum_pg_proc_pronamespace - 1] = ObjectIdGetDatum(procNamespace); (gdb) 318 values[Anum_pg_proc_proowner - 1] = ObjectIdGetDatum(proowner); (gdb) 319 values[Anum_pg_proc_prolang - 1] = ObjectIdGetDatum(languageObjectId); (gdb) 320 values[Anum_pg_proc_procost - 1] = Float4GetDatum(procost); (gdb) 321 values[Anum_pg_proc_prorows - 1] = Float4GetDatum(prorows); (gdb) 322 values[Anum_pg_proc_provariadic - 1] = ObjectIdGetDatum(variadicType); (gdb) 323 values[Anum_pg_proc_prosupport - 1] = ObjectIdGetDatum(prosupport); (gdb) 324 values[Anum_pg_proc_prokind - 1] = CharGetDatum(prokind); (gdb) 325 values[Anum_pg_proc_prosecdef - 1] = BoolGetDatum(security_definer); (gdb) 326 values[Anum_pg_proc_proleakproof - 1] = BoolGetDatum(isLeakProof); (gdb) 327 values[Anum_pg_proc_proisstrict - 1] = BoolGetDatum(isStrict); (gdb) 328 values[Anum_pg_proc_proretset - 1] = BoolGetDatum(returnsSet); (gdb) 329 values[Anum_pg_proc_provolatile - 1] = CharGetDatum(volatility); (gdb) 330 values[Anum_pg_proc_proparallel - 1] = CharGetDatum(parallel); (gdb) 331 values[Anum_pg_proc_pronargs - 1] = UInt16GetDatum(parameterCount); (gdb) 332 values[Anum_pg_proc_pronargdefaults - 1] = UInt16GetDatum(list_length(parameterDefaults)); (gdb) 333 values[Anum_pg_proc_prorettype - 1] = ObjectIdGetDatum(returnType); (gdb) 334 values[Anum_pg_proc_proargtypes - 1] = PointerGetDatum(parameterTypes); (gdb) 335 if (allParameterTypes != PointerGetDatum(NULL)) (gdb) 336 values[Anum_pg_proc_proallargtypes - 1] = allParameterTypes; (gdb) 339 if (parameterModes != PointerGetDatum(NULL)) (gdb) 340 values[Anum_pg_proc_proargmodes - 1] = parameterModes; (gdb) 343 if (parameterNames != PointerGetDatum(NULL)) (gdb) 344 values[Anum_pg_proc_proargnames - 1] = parameterNames; (gdb) 347 if (parameterDefaults != NIL) (gdb) 350 nulls[Anum_pg_proc_proargdefaults - 1] = true; (gdb) 351 if (trftypes != PointerGetDatum(NULL)) (gdb) 354 nulls[Anum_pg_proc_protrftypes - 1] = true; (gdb) 355 values[Anum_pg_proc_prosrc - 1] = CStringGetTextDatum(prosrc); (gdb) 356 if (probin) (gdb) 359 nulls[Anum_pg_proc_probin - 1] = true; (gdb) 360 if (proconfig != PointerGetDatum(NULL)) (gdb) 363 nulls[Anum_pg_proc_proconfig - 1] = true; (gdb) 366 rel = table_open(ProcedureRelationId, RowExclusiveLock); (gdb) 367 tupDesc = RelationGetDescr(rel); (gdb)
判断是否已存在
(gdb) p values[28]
$21 = 0
(gdb) p values[0]
$22 = 0
(gdb) p values[2]
$23 = 2200
(gdb) n
370 oldtup = SearchSysCache3(PROCNAMEARGSNSP,
(gdb) p *tupDesc
$24 = {natts = 29, tdtypeid = 81, tdtypmod = -1, tdrefcount = 1, constr = 0x7fbeb44493b8,
attrs = 0x7fbeb44483b8}
(gdb) n
375 if (HeapTupleIsValid(oldtup))
(gdb)
378 Form_pg_proc oldproc = (Form_pg_proc) GETSTRUCT(oldtup);
(gdb)
383 if (!replace)
(gdb) p oldproc
$25 = (Form_pg_proc) 0x7fbeb4388bf8
(gdb) p *oldproc
$26 = {oid = 16387, proname = {data = "func_test", '\000' <repeats 54 times>},
pronamespace = 2200, proowner = 10, prolang = 13581, procost = 100, prorows = 0,
provariadic = 0, prosupport = 0, prokind = 102 'f', prosecdef = false,
proleakproof = false, proisstrict = false, proretset = false, provolatile = 118 'v',
proparallel = 117 'u', pronargs = 3, pronargdefaults = 0, prorettype = 2249, proargtypes = {
vl_len_ = 144, ndim = 1, dataoffset = 0, elemtype = 26, dim1 = 3, lbound1 = 0,
values = 0x7fbeb4388c80}}
(gdb)执行相关判断:如返回类型,参数类型,参数个数等
(gdb) n 388 if (!pg_proc_ownercheck(oldproc->oid, proowner)) (gdb) 393 if (oldproc->prokind != prokind) (gdb) 407 dropcmd = (prokind == PROKIND_PROCEDURE ? "DROP PROCEDURE" : (gdb) 419 if (returnType != oldproc->prorettype || (gdb) 420 returnsSet != oldproc->proretset) (gdb) 419 if (returnType != oldproc->prorettype || (gdb) 439 if (returnType == RECORDOID) (gdb) 444 olddesc = build_function_result_tupdesc_t(oldtup); (gdb) 445 newdesc = build_function_result_tupdesc_d(prokind, (gdb) 449 if (olddesc == NULL && newdesc == NULL) (gdb) 451 else if (olddesc == NULL || newdesc == NULL || (gdb) 452 !equalTupleDescs(olddesc, newdesc)) (gdb) 451 else if (olddesc == NULL || newdesc == NULL || (gdb) 468 proargnames = SysCacheGetAttr(PROCNAMEARGSNSP, oldtup, (gdb) 471 if (!isnull) (gdb) 480 proargmodes = SysCacheGetAttr(PROCNAMEARGSNSP, oldtup, (gdb) 483 if (isnull) (gdb) 486 n_old_arg_names = get_func_input_arg_names(proargnames, (gdb) 489 n_new_arg_names = get_func_input_arg_names(parameterNames, (gdb) 492 for (j = 0; j < n_old_arg_names; j++) (gdb) 494 if (old_arg_names[j] == NULL) (gdb) 496 if (j >= n_new_arg_names || new_arg_names[j] == NULL || (gdb) 497 strcmp(old_arg_names[j], new_arg_names[j]) != 0) (gdb) 496 if (j >= n_new_arg_names || new_arg_names[j] == NULL || (gdb) 492 for (j = 0; j < n_old_arg_names; j++) (gdb) 494 if (old_arg_names[j] == NULL) (gdb) 496 if (j >= n_new_arg_names || new_arg_names[j] == NULL || (gdb) 497 strcmp(old_arg_names[j], new_arg_names[j]) != 0) (gdb) 496 if (j >= n_new_arg_names || new_arg_names[j] == NULL || (gdb) 492 for (j = 0; j < n_old_arg_names; j++) (gdb) 494 if (old_arg_names[j] == NULL) (gdb) 496 if (j >= n_new_arg_names || new_arg_names[j] == NULL || (gdb) 497 strcmp(old_arg_names[j], new_arg_names[j]) != 0) (gdb) 496 if (j >= n_new_arg_names || new_arg_names[j] == NULL || (gdb) 492 for (j = 0; j < n_old_arg_names; j++) (gdb) 517 if (oldproc->pronargdefaults != 0) (gdb) 568 replaces[Anum_pg_proc_oid - 1] = false; (gdb) 569 replaces[Anum_pg_proc_proowner - 1] = false; (gdb) 570 replaces[Anum_pg_proc_proacl - 1] = false; (gdb) 573 tup = heap_modify_tuple(oldtup, tupDesc, values, nulls, replaces); (gdb) 574 CatalogTupleUpdate(rel, &tup->t_self, tup); (gdb
更新tuple
(gdb) n 576 ReleaseSysCache(oldtup); (gdb) 577 is_update = true; (gdb) 601 retval = ((Form_pg_proc) GETSTRUCT(tup))->oid; (gdb)
处理函数依赖
(gdb) p retval $27 = 16387 (gdb) n 610 deleteDependencyRecordsFor(ProcedureRelationId, retval, true); (gdb) 612 myself.classId = ProcedureRelationId; (gdb) 613 myself.objectId = retval; (gdb) 614 myself.objectSubId = 0; (gdb) 617 referenced.classId = NamespaceRelationId; (gdb) 618 referenced.objectId = procNamespace; (gdb) 619 referenced.objectSubId = 0; (gdb) 620 recordDependencyOn(&myself, &referenced, DEPENDENCY_NORMAL); (gdb) 623 referenced.classId = LanguageRelationId; (gdb) 624 referenced.objectId = languageObjectId; (gdb) 625 referenced.objectSubId = 0; (gdb) 626 recordDependencyOn(&myself, &referenced, DEPENDENCY_NORMAL); (gdb) 629 referenced.classId = TypeRelationId; (gdb) 630 referenced.objectId = returnType; (gdb) 631 referenced.objectSubId = 0; (gdb) 632 recordDependencyOn(&myself, &referenced, DEPENDENCY_NORMAL); (gdb) 635 if ((trfid = get_transform_oid(returnType, languageObjectId, true))) (gdb) 644 for (i = 0; i < allParamCount; i++) (gdb) 646 referenced.classId = TypeRelationId; (gdb) 647 referenced.objectId = allParams[i]; (gdb) 648 referenced.objectSubId = 0; (gdb) 649 recordDependencyOn(&myself, &referenced, DEPENDENCY_NORMAL); (gdb) 652 if ((trfid = get_transform_oid(allParams[i], languageObjectId, true))) (gdb) 644 for (i = 0; i < allParamCount; i++) (gdb) 646 referenced.classId = TypeRelationId; (gdb) 647 referenced.objectId = allParams[i]; (gdb) 648 referenced.objectSubId = 0; (gdb) 649 recordDependencyOn(&myself, &referenced, DEPENDENCY_NORMAL); (gdb) 652 if ((trfid = get_transform_oid(allParams[i], languageObjectId, true))) (gdb) 644 for (i = 0; i < allParamCount; i++) (gdb) 646 referenced.classId = TypeRelationId; (gdb) 647 referenced.objectId = allParams[i]; (gdb) 648 referenced.objectSubId = 0; (gdb) 649 recordDependencyOn(&myself, &referenced, DEPENDENCY_NORMAL); (gdb) 652 if ((trfid = get_transform_oid(allParams[i], languageObjectId, true))) (gdb) 644 for (i = 0; i < allParamCount; i++) (gdb) 646 referenced.classId = TypeRelationId; (gdb) 647 referenced.objectId = allParams[i]; (gdb) 648 referenced.objectSubId = 0; (gdb) 649 recordDependencyOn(&myself, &referenced, DEPENDENCY_NORMAL); (gdb) 652 if ((trfid = get_transform_oid(allParams[i], languageObjectId, true))) (gdb) 644 for (i = 0; i < allParamCount; i++) (gdb) 646 referenced.classId = TypeRelationId; (gdb) 647 referenced.objectId = allParams[i]; (gdb) 648 referenced.objectSubId = 0; (gdb) 649 recordDependencyOn(&myself, &referenced, DEPENDENCY_NORMAL); (gdb) 652 if ((trfid = get_transform_oid(allParams[i], languageObjectId, true))) (gdb) 644 for (i = 0; i < allParamCount; i++) (gdb) 662 if (parameterDefaults) (gdb) 667 if (OidIsValid(prosupport)) (gdb) 676 if (!is_update) (gdb) 680 if (!is_update) (gdb) 685 recordDependencyOnCurrentExtension(&myself, is_update); (gdb) 687 heap_freetuple(tup); (gdb) 690 InvokeObjectPostCreateHook(ProcedureRelationId, retval, 0); (gdb) 692 table_close(rel, RowExclusiveLock); (gdb)
执行函数body验证
695 if (OidIsValid(languageValidator)) (gdb) 697 ArrayType *set_items = NULL; (gdb) 698 int save_nestlevel = 0; (gdb) 701 CommandCounterIncrement(); (gdb) 713 if (check_function_bodies) (gdb) (gdb) n 715 set_items = (ArrayType *) DatumGetPointer(proconfig); (gdb) 716 if (set_items) /* Need a new GUC nesting level */ (gdb) 726 OidFunctionCall1(languageValidator, ObjectIdGetDatum(retval)); (gdb) 728 if (set_items) (gdb) 732 return myself; (gdb) 733 } (gdb)
完成调用
(gdb) 733 } (gdb) CreateFunction (pstate=0x1199c88, stmt=0x11748c8) at functioncmds.c:1176 1176 } (gdb)
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