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pldbgapi2.c
1352 lines (1071 loc) · 33.5 KB
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pldbgapi2.c
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/*-------------------------------------------------------------------------
*
* pldbgapi2
*
* enhanced debug API for plpgsql
*
* by Pavel Stehule 2013-2023
*
*-------------------------------------------------------------------------
*
* Notes:
* PL debug API has few issues related to plpgsql profiler and tracer:
*
* 1. Only one extension that use this API can be active
*
* 2. Doesn't catch an application's exceptions, and cannot to handle an
* exceptions in applications.
*
* pldbgapi2 does new interfaces based on pl debug API and fmgr API, and try
* to solve these issues. It can be used by more at the same time plugins,
* and allows to set hooks on end of execution of statement or function at
* aborted state.
*
*/
#include "postgres.h"
#include "plpgsql.h"
#include "fmgr.h"
#include "catalog/pg_proc.h"
#include "catalog/pg_language.h"
#include "commands/proclang.h"
#include "utils/inval.h"
#include "utils/lsyscache.h"
#include "utils/syscache.h"
#include "utils/palloc.h"
#include "plpgsql_check.h"
#define MAX_PLDBGAPI2_PLUGINS 10
#define INITIAL_PLDBGAPI2_STMT_STACK_SIZE 32
#define FMGR_CACHE_MAGIC 2023071110
#define PLUGIN_INFO_MAGIC 2023071111
static Oid PLpgSQLlanguageId = InvalidOid;
static Oid PLpgSQLinlineFunc = InvalidOid;
typedef struct func_info_hashkey
{
Oid fn_oid;
TransactionId fn_xmin;
ItemPointerData fn_tid;
} func_info_hashkey;
typedef struct func_info_entry
{
func_info_hashkey key;
uint32 hashValue;
char *fn_name;
char *fn_signature;
plpgsql_check_plugin2_stmt_info *stmts_info;
int *stmtid_map;
int nstatements;
int use_count;
bool is_valid;
} func_info_entry;
static HTAB *func_info_HashTable = NULL;
typedef struct fmgr_cache
{
int magic;
Oid funcid;
bool is_plpgsql;
Datum arg;
} fmgr_cache;
typedef struct fmgr_plpgsql_cache
{
int magic;
Oid funcid;
bool is_plpgsql;
Datum arg;
void *plugin2_info[MAX_PLDBGAPI2_PLUGINS];
MemoryContext fn_mcxt;
int *stmtid_stack;
int stmtid_stack_size;
int current_stmtid_stack_size;
func_info_entry *func_info;
} fmgr_plpgsql_cache;
static fmgr_plpgsql_cache *last_fmgr_plpgsql_cache = NULL;
static needs_fmgr_hook_type prev_needs_fmgr_hook = NULL;
static fmgr_hook_type prev_fmgr_hook = NULL;
static plpgsql_check_plugin2 *plpgsql_plugins2[MAX_PLDBGAPI2_PLUGINS];
static int nplpgsql_plugins2 = 0;
static void pldbgapi2_func_setup(PLpgSQL_execstate *estate, PLpgSQL_function *func);
static void pldbgapi2_func_beg(PLpgSQL_execstate *estate, PLpgSQL_function *func);
static void pldbgapi2_func_end(PLpgSQL_execstate *estate, PLpgSQL_function *func);
static void pldbgapi2_stmt_beg(PLpgSQL_execstate *estate, PLpgSQL_stmt *stmt);
static void pldbgapi2_stmt_end(PLpgSQL_execstate *estate, PLpgSQL_stmt *stmt);
static PLpgSQL_plugin pldbgapi2_plugin = { pldbgapi2_func_setup,
pldbgapi2_func_beg, pldbgapi2_func_end,
pldbgapi2_stmt_beg, pldbgapi2_stmt_end,
#if PG_VERSION_NUM >= 150000
NULL, NULL, NULL, NULL, NULL };
#else
NULL, NULL };
#endif
static PLpgSQL_plugin *prev_plpgsql_plugin = NULL;
MemoryContext pldbgapi2_mcxt = NULL;
typedef struct pldbgapi2_plugin_info
{
int magic;
fmgr_plpgsql_cache *fcache_plpgsql;
void *prev_plugin_info;
} pldbgapi2_plugin_info;
static func_info_entry *get_func_info(PLpgSQL_function *func);
static fmgr_plpgsql_cache *current_fmgr_plpgsql_cache;
plpgsql_check_plugin2_stmt_info *
plpgsql_check_get_current_stmt_info(int stmtid)
{
Assert(current_fmgr_plpgsql_cache);
Assert(current_fmgr_plpgsql_cache->func_info);
Assert(stmtid <= current_fmgr_plpgsql_cache->func_info->nstatements);
return &(current_fmgr_plpgsql_cache->func_info->stmts_info[stmtid - 1]);
}
plpgsql_check_plugin2_stmt_info *
plpgsql_check_get_current_stmts_info(void)
{
Assert(current_fmgr_plpgsql_cache);
Assert(current_fmgr_plpgsql_cache->func_info);
Assert(current_fmgr_plpgsql_cache->func_info->use_count > 0);
return current_fmgr_plpgsql_cache->func_info->stmts_info;
}
/*
* It is used outside pldbapi2 plugins. This is used by output functions,
* so we don't need to solve effectivity too much. Instead handling use_count
* returns copy.
*/
plpgsql_check_plugin2_stmt_info *
plpgsql_check_get_stmts_info(PLpgSQL_function *func)
{
func_info_entry *func_info;
plpgsql_check_plugin2_stmt_info *stmts_info;
size_t bytes;
func_info = get_func_info(func);
bytes = func->nstatements * sizeof(plpgsql_check_plugin2_stmt_info);
stmts_info = palloc(bytes);
memcpy(stmts_info, func_info->stmts_info, bytes);
return stmts_info;
}
int *
plpgsql_check_get_current_stmtid_map(void)
{
Assert(current_fmgr_plpgsql_cache);
Assert(current_fmgr_plpgsql_cache->func_info);
Assert(current_fmgr_plpgsql_cache->func_info->use_count > 0);
return current_fmgr_plpgsql_cache->func_info->stmtid_map;
}
int *
plpgsql_check_get_stmtid_map(PLpgSQL_function *func)
{
func_info_entry *func_info;
int *stmtid_map;
size_t bytes;
func_info = get_func_info(func);
bytes = func->nstatements * sizeof(int);
stmtid_map = palloc(bytes);
memcpy(stmtid_map, func_info->stmtid_map, bytes);
return stmtid_map;
}
char *
plpgsql_check_get_current_func_info_name(void)
{
Assert(current_fmgr_plpgsql_cache);
Assert(current_fmgr_plpgsql_cache->func_info);
Assert(current_fmgr_plpgsql_cache->func_info->use_count > 0);
return current_fmgr_plpgsql_cache->func_info->fn_name;
}
char *
plpgsql_check_get_current_func_info_signature(void)
{
Assert(current_fmgr_plpgsql_cache);
Assert(current_fmgr_plpgsql_cache->func_info);
Assert(current_fmgr_plpgsql_cache->func_info->use_count > 0);
Assert(current_fmgr_plpgsql_cache->func_info->fn_signature);
return current_fmgr_plpgsql_cache->func_info->fn_signature;
}
MemoryContext
plpgsql_check_get_current_fn_mcxt(void)
{
Assert(current_fmgr_plpgsql_cache);
Assert(current_fmgr_plpgsql_cache->func_info);
Assert(current_fmgr_plpgsql_cache->func_info->use_count > 0);
return current_fmgr_plpgsql_cache->fn_mcxt;
}
static void
func_info_init_hashkey(func_info_hashkey *hk, PLpgSQL_function *func)
{
memset(hk, 0, sizeof(func_info_hashkey));
hk->fn_oid = func->fn_oid;
hk->fn_xmin = func->fn_xmin;
hk->fn_tid = func->fn_tid;
}
/*
* Hash table for function profiling metadata.
*/
static void
func_info_HashTableInit(void)
{
HASHCTL ctl;
Assert(func_info_HashTable == NULL);
memset(&ctl, 0, sizeof(ctl));
ctl.keysize = sizeof(func_info_hashkey);
ctl.entrysize = sizeof(func_info_entry);
ctl.hcxt = pldbgapi2_mcxt;
func_info_HashTable = hash_create("plpgsql_check function pldbgapi2 statements info cache",
FUNCS_PER_USER,
&ctl,
HASH_ELEM | HASH_BLOBS | HASH_CONTEXT);
}
static void
init_hash_tables(void)
{
if (pldbgapi2_mcxt)
{
MemoryContextReset(pldbgapi2_mcxt);
func_info_HashTable = NULL;
}
else
{
pldbgapi2_mcxt = AllocSetContextCreate(TopMemoryContext,
"plpgsql_check - pldbgapi2 context",
ALLOCSET_DEFAULT_MINSIZE,
ALLOCSET_DEFAULT_INITSIZE,
ALLOCSET_DEFAULT_MAXSIZE);
}
func_info_HashTableInit();
}
static void set_stmt_info(PLpgSQL_stmt *stmt, plpgsql_check_plugin2_stmt_info *stmts_info, int *stmtid_map, int level, int *natural_id, int parent_id);
static void
set_stmts_info(List *stmts,
plpgsql_check_plugin2_stmt_info *stmts_info,
int *stmtid_map,
int level,
int *natural_id,
int parent_id)
{
ListCell *lc;
foreach(lc, stmts)
{
set_stmt_info((PLpgSQL_stmt *) lfirst(lc),
stmts_info,
stmtid_map,
level,
natural_id,
parent_id);
}
}
static void
set_stmt_info(PLpgSQL_stmt *stmt,
plpgsql_check_plugin2_stmt_info *stmts_info,
int *stmtid_map,
int level,
int *natural_id,
int parent_id)
{
ListCell *lc;
int stmtid_idx = stmt->stmtid - 1;
bool is_invisible = stmt->lineno < 1;
Assert(stmts_info);
/* level is used for indentation */
stmts_info[stmtid_idx].level = level;
/* natural_id is displayed insted stmtid */
stmts_info[stmtid_idx].natural_id = ++(*natural_id);
/*
* natural id to parser id map allows to use natural statement order
* for saving metrics and their presentation without necessity to
* iterate over statement tree
*/
stmtid_map[stmts_info[stmtid_idx].natural_id - 1] = stmt->stmtid;
/*
* parent_id is used for synchronization stmts stack
* after handled exception
*/
stmts_info[stmtid_idx].parent_id = parent_id;
/*
* persistent stmt type name can be used by tracer
* when syntax tree can be unaccessable
*/
stmts_info[stmtid_idx].typname = plpgsql_check__stmt_typename_p(stmt);
/* used for skipping printing invisible block statement */
stmts_info[stmtid_idx].is_invisible = is_invisible;
/* by default any statements is not a container of other statements */
stmts_info[stmtid_idx].is_container = false;
switch (stmt->cmd_type)
{
case PLPGSQL_STMT_BLOCK:
{
PLpgSQL_stmt_block *stmt_block = (PLpgSQL_stmt_block *) stmt;
set_stmts_info(stmt_block->body,
stmts_info,
stmtid_map,
!is_invisible ? level + 1 : level,
natural_id,
stmt->stmtid);
if (stmt_block->exceptions)
{
foreach(lc, stmt_block->exceptions->exc_list)
{
set_stmts_info(((PLpgSQL_exception *) lfirst(lc))->action,
stmts_info,
stmtid_map,
!is_invisible ? level + 1 : level,
natural_id,
stmt->stmtid);
}
}
stmts_info[stmtid_idx].is_container = true;
}
break;
case PLPGSQL_STMT_IF:
{
PLpgSQL_stmt_if *stmt_if = (PLpgSQL_stmt_if *) stmt;
set_stmts_info(stmt_if->then_body,
stmts_info,
stmtid_map,
level + 1,
natural_id,
stmt->stmtid);
foreach(lc, stmt_if->elsif_list)
{
set_stmts_info(((PLpgSQL_if_elsif *) lfirst(lc))->stmts,
stmts_info,
stmtid_map,
level + 1,
natural_id,
stmt->stmtid);
}
set_stmts_info(stmt_if->else_body,
stmts_info,
stmtid_map,
level + 1,
natural_id,
stmt->stmtid);
stmts_info[stmtid_idx].is_container = true;
}
break;
case PLPGSQL_STMT_CASE:
{
PLpgSQL_stmt_case *stmt_case = (PLpgSQL_stmt_case *) stmt;
foreach(lc, stmt_case->case_when_list)
{
set_stmts_info(((PLpgSQL_case_when *) lfirst(lc))->stmts,
stmts_info,
stmtid_map,
level + 1,
natural_id,
stmt->stmtid);
}
set_stmts_info(stmt_case->else_stmts,
stmts_info,
stmtid_map,
level + 1,
natural_id,
stmt->stmtid);
stmts_info[stmtid_idx].is_container = true;
}
break;
case PLPGSQL_STMT_LOOP:
set_stmts_info(((PLpgSQL_stmt_loop *) stmt)->body,
stmts_info,
stmtid_map,
level + 1,
natural_id,
stmt->stmtid);
stmts_info[stmtid_idx].is_container = true;
break;
case PLPGSQL_STMT_FORI:
set_stmts_info(((PLpgSQL_stmt_fori *) stmt)->body,
stmts_info,
stmtid_map,
level + 1,
natural_id,
stmt->stmtid);
stmts_info[stmtid_idx].is_container = true;
break;
case PLPGSQL_STMT_FORS:
set_stmts_info(((PLpgSQL_stmt_fors *) stmt)->body,
stmts_info,
stmtid_map,
level + 1,
natural_id,
stmt->stmtid);
stmts_info[stmtid_idx].is_container = true;
break;
case PLPGSQL_STMT_FORC:
set_stmts_info(((PLpgSQL_stmt_forc *) stmt)->body,
stmts_info,
stmtid_map,
level + 1,
natural_id,
stmt->stmtid);
stmts_info[stmtid_idx].is_container = true;
break;
case PLPGSQL_STMT_DYNFORS:
set_stmts_info(((PLpgSQL_stmt_dynfors *) stmt)->body,
stmts_info,
stmtid_map,
level + 1,
natural_id,
stmt->stmtid);
stmts_info[stmtid_idx].is_container = true;
break;
case PLPGSQL_STMT_FOREACH_A:
set_stmts_info(((PLpgSQL_stmt_foreach_a *) stmt)->body,
stmts_info,
stmtid_map,
level + 1,
natural_id,
stmt->stmtid);
stmts_info[stmtid_idx].is_container = true;
break;
case PLPGSQL_STMT_WHILE:
set_stmts_info(((PLpgSQL_stmt_while *) stmt)->body,
stmts_info,
stmtid_map,
level + 1,
natural_id,
stmt->stmtid);
stmts_info[stmtid_idx].is_container = true;
break;
default:
stmts_info[stmtid_idx].is_container = false;
break;
}
}
/*
* Returns oid of used language
*/
static Oid
get_func_lang(Oid funcid)
{
HeapTuple procTuple;
Oid result;
procTuple = SearchSysCache1(PROCOID, ObjectIdGetDatum(funcid));
if (!HeapTupleIsValid(procTuple))
elog(ERROR, "cache lookup failed for function %u", funcid);
result = ((Form_pg_proc) GETSTRUCT(procTuple))->prolang;
ReleaseSysCache(procTuple);
return result;
}
/*
* Set PLpgSQLlanguageId and PLpgSQLinlineFunc
*/
static void
set_plpgsql_info(void)
{
HeapTuple languageTuple;
Form_pg_language languageStruct;
languageTuple = SearchSysCache1(LANGNAME, PointerGetDatum("plpgsql"));
if (!HeapTupleIsValid(languageTuple))
elog(ERROR, "language \"plpgsql\" does not exist");
languageStruct = (Form_pg_language) GETSTRUCT(languageTuple);
PLpgSQLlanguageId = languageStruct->oid;
PLpgSQLinlineFunc = languageStruct->laninline;
ReleaseSysCache(languageTuple);
}
/*
* All plpgsql functions needs fmgr hook. We need to process abort state.
*/
static bool
pldbgapi2_needs_fmgr_hook(Oid fn_oid)
{
if (prev_needs_fmgr_hook &&
(*prev_needs_fmgr_hook) (fn_oid))
return true;
/*
* We need to delay initialization of PLpgSQLlanguageId. If library
* was initialized too early, the system catalog is not accessable.
*/
if (!OidIsValid(PLpgSQLlanguageId))
set_plpgsql_info();
/*
* code of DO statements is executed by execution of function
* laninline. We need to fmgr hook for plpgsql_inline_handler too.
*/
if (fn_oid == PLpgSQLinlineFunc)
return true;
return get_func_lang(fn_oid) == PLpgSQLlanguageId;
}
static void
pldbgapi2_fmgr_hook(FmgrHookEventType event,
FmgrInfo *flinfo, Datum *private)
{
fmgr_cache *fcache = (fmgr_cache *) DatumGetPointer(*private);
bool is_pldbgapi2_fcache = false;
switch (event)
{
case FHET_START:
if (!fcache)
{
if (!OidIsValid(PLpgSQLlanguageId))
set_plpgsql_info();
if (get_func_lang(flinfo->fn_oid) == PLpgSQLlanguageId ||
flinfo->fn_oid == PLpgSQLinlineFunc)
{
MemoryContext oldcxt = MemoryContextSwitchTo(flinfo->fn_mcxt);
fmgr_plpgsql_cache *fcache_plpgsql = NULL;
fcache_plpgsql = palloc0(sizeof(fmgr_plpgsql_cache));
fcache_plpgsql->magic = FMGR_CACHE_MAGIC;
fcache_plpgsql->funcid = flinfo->fn_oid;
fcache_plpgsql->is_plpgsql = true;
fcache_plpgsql->fn_mcxt = flinfo->fn_mcxt;
fcache_plpgsql->stmtid_stack = palloc_array(int, INITIAL_PLDBGAPI2_STMT_STACK_SIZE);
fcache_plpgsql->stmtid_stack_size = INITIAL_PLDBGAPI2_STMT_STACK_SIZE;
fcache_plpgsql->current_stmtid_stack_size = 0;
MemoryContextSwitchTo(oldcxt);
fcache = (fmgr_cache *) fcache_plpgsql;
}
else
{
fcache = MemoryContextAlloc(flinfo->fn_mcxt, sizeof(fmgr_cache));
fcache->magic = FMGR_CACHE_MAGIC;
fcache->funcid = flinfo->fn_oid;
fcache->is_plpgsql = false;
fcache->arg = (Datum) 0;
}
*private = PointerGetDatum(fcache);
}
if (fcache && fcache->magic != FMGR_CACHE_MAGIC)
elog(ERROR, "unexpected fmgr_hook cache magic number");
is_pldbgapi2_fcache = true;
if (fcache->is_plpgsql)
{
fmgr_plpgsql_cache *fcache_plpgsql = (fmgr_plpgsql_cache *) fcache;
last_fmgr_plpgsql_cache = fcache_plpgsql;
fcache_plpgsql->current_stmtid_stack_size = 0;
}
else
last_fmgr_plpgsql_cache = NULL;
break;
case FHET_END:
case FHET_ABORT:
/*
* Unfortunately, the fmgr hook can be redirected inside security definer
* function, and then there can be possible to so FHET_END or FHET_ABORT
* are called with private for previous plugin. In this case, the best
* solution is probably do nothing, and skip processing to previous
* plugin.
*/
is_pldbgapi2_fcache = (fcache && fcache->magic == FMGR_CACHE_MAGIC);
if (is_pldbgapi2_fcache && event == FHET_ABORT && fcache->is_plpgsql)
{
fmgr_plpgsql_cache *fcache_plpgsql = (fmgr_plpgsql_cache *) fcache;
int sp;
int i;
Oid fn_oid;
Assert(fcache_plpgsql->funcid == flinfo->fn_oid);
fn_oid = flinfo->fn_oid != PLpgSQLinlineFunc ? flinfo->fn_oid : InvalidOid;
current_fmgr_plpgsql_cache = fcache_plpgsql;
for (sp = fcache_plpgsql->current_stmtid_stack_size; sp > 0; sp--)
{
int stmtid = fcache_plpgsql->stmtid_stack[sp - 1];
for (i = 0; i < nplpgsql_plugins2; i++)
{
if (plpgsql_plugins2[i]->stmt_end2_aborted)
(plpgsql_plugins2[i]->stmt_end2_aborted)(fn_oid, stmtid,
&fcache_plpgsql->plugin2_info[i]);
}
}
for (i = 0; i < nplpgsql_plugins2; i++)
{
if (plpgsql_plugins2[i]->func_end2_aborted)
(plpgsql_plugins2[i]->func_end2_aborted)(fn_oid,
&fcache_plpgsql->plugin2_info[i]);
}
current_fmgr_plpgsql_cache = NULL;
if (fcache_plpgsql->func_info)
{
Assert(fcache_plpgsql->func_info->use_count > 0);
fcache_plpgsql->func_info->use_count--;
}
}
break;
}
if (prev_fmgr_hook)
(*prev_fmgr_hook) (event, flinfo, is_pldbgapi2_fcache ? &fcache->arg : private);
}
static func_info_entry *
get_func_info(PLpgSQL_function *func)
{
func_info_entry *func_info;
bool persistent_func_info;
bool found_func_info_entry;
func_info_hashkey hk;
if (OidIsValid(func->fn_oid))
{
func_info_init_hashkey(&hk, func);
func_info = (func_info_entry *) hash_search(func_info_HashTable,
(void *) &hk,
HASH_ENTER,
&found_func_info_entry);
if (found_func_info_entry && !func_info->is_valid)
{
pfree(func_info->fn_name);
pfree(func_info->fn_signature);
pfree(func_info->stmts_info);
pfree(func_info->stmtid_map);
if (hash_search(func_info_HashTable,
&func_info->key,
HASH_REMOVE, NULL) == NULL)
elog(ERROR, "hash table corrupted");
found_func_info_entry = false;
}
persistent_func_info = true;
}
else
{
/* one shot sie for anonymous blocks */
func_info = palloc(sizeof(func_info_entry));
persistent_func_info = false;
found_func_info_entry = false;
}
if (!found_func_info_entry)
{
char *fn_name;
int natural_id = 0;
fn_name = get_func_name(func->fn_oid);
/*
* Unfortunately, in this moment the called function can be dropped.
* get_func_name forces sinval message processing, and all related
* metadata will be lost. So get_func_name can return NULL. In this
* case we can use signature from plpgsql's cache. That is protected
* until function execution's end.
*/
if (!fn_name)
fn_name = func->fn_signature;
if (persistent_func_info)
{
MemoryContext oldcxt;
oldcxt = MemoryContextSwitchTo(pldbgapi2_mcxt);
Assert(fn_name);
func_info->hashValue = GetSysCacheHashValue1(PROCOID,
ObjectIdGetDatum(func->fn_oid));
func_info->fn_name = pstrdup(fn_name);
func_info->fn_signature = pstrdup(func->fn_signature);
func_info->stmts_info = palloc(func->nstatements *
sizeof(plpgsql_check_plugin2_stmt_info));
func_info->stmtid_map = palloc(func->nstatements * sizeof(int));
func_info->use_count = 0;
MemoryContextSwitchTo(oldcxt);
}
else
{
func_info->fn_name = fn_name;
func_info->fn_signature = pstrdup(func->fn_signature);
func_info->stmts_info = palloc(func->nstatements *
sizeof(plpgsql_check_plugin2_stmt_info));
func_info->stmtid_map = palloc(func->nstatements * sizeof(int));
}
func_info->nstatements = func->nstatements;
func_info->use_count = 0;
func_info->is_valid = true;
set_stmt_info((PLpgSQL_stmt *) func->action,
func_info->stmts_info,
func_info->stmtid_map,
1, &natural_id, 0);
}
func_info->nstatements = func->nstatements;
return func_info;
}
static void
pldbgapi2_func_setup(PLpgSQL_execstate *estate, PLpgSQL_function *func)
{
fmgr_plpgsql_cache *fcache_plpgsql = last_fmgr_plpgsql_cache;
pldbgapi2_plugin_info *plugin_info;
MemoryContext oldcxt;
func_info_entry *func_info;
int i;
Assert(fcache_plpgsql->magic == FMGR_CACHE_MAGIC);
Assert(fcache_plpgsql);
Assert(fcache_plpgsql->is_plpgsql);
#ifdef USE_ASSERT_CHECKING
if (fcache_plpgsql->funcid != PLpgSQLinlineFunc)
{
Assert(fcache_plpgsql->funcid == func->fn_oid);
Assert(fcache_plpgsql->funcid == estate->func->fn_oid);
}
else
{
Assert(!OidIsValid(func->fn_oid));
Assert(!OidIsValid(estate->func->fn_oid));
}
#endif
plugin_info = MemoryContextAlloc(fcache_plpgsql->fn_mcxt, sizeof(pldbgapi2_plugin_info));
plugin_info->magic = PLUGIN_INFO_MAGIC;
plugin_info->fcache_plpgsql = fcache_plpgsql;
plugin_info->prev_plugin_info = NULL;
func_info = get_func_info(func);
/* protect func_info against sinval */
func_info->use_count++;
fcache_plpgsql->func_info = func_info;
estate->plugin_info = plugin_info;
current_fmgr_plpgsql_cache = fcache_plpgsql;
for (i = 0; i < nplpgsql_plugins2; i++)
{
fcache_plpgsql->plugin2_info[i] = NULL;
plpgsql_plugins2[i]->error_callback = pldbgapi2_plugin.error_callback;
plpgsql_plugins2[i]->assign_expr = pldbgapi2_plugin.assign_expr;
#if PG_VERSION_NUM >= 150000
plpgsql_plugins2[i]->assign_value = pldbgapi2_plugin.assign_value;
plpgsql_plugins2[i]->eval_datum = pldbgapi2_plugin.eval_datum;
plpgsql_plugins2[i]->cast_value = pldbgapi2_plugin.cast_value;
#else
plpgsql_plugins2[i]->assign_value = NULL;
plpgsql_plugins2[i]->eval_datum = NULL;
plpgsql_plugins2[i]->cast_value = NULL;
#endif
oldcxt = MemoryContextSwitchTo(fcache_plpgsql->fn_mcxt);
if (plpgsql_plugins2[i]->func_setup2)
(plpgsql_plugins2[i]->func_setup2)(estate, func, &fcache_plpgsql->plugin2_info[i]);
MemoryContextSwitchTo(oldcxt);
}
if (prev_plpgsql_plugin)
{
prev_plpgsql_plugin->error_callback = pldbgapi2_plugin.error_callback;
prev_plpgsql_plugin->assign_expr = pldbgapi2_plugin.assign_expr;
#if PG_VERSION_NUM >= 150000
prev_plpgsql_plugin->assign_value = pldbgapi2_plugin.assign_value;
prev_plpgsql_plugin->eval_datum = pldbgapi2_plugin.eval_datum;
prev_plpgsql_plugin->cast_value = pldbgapi2_plugin.cast_value;
#endif
if (prev_plpgsql_plugin->func_setup)
{
PG_TRY();
{
(prev_plpgsql_plugin->func_setup)(estate, func);
plugin_info->prev_plugin_info = estate->plugin_info;
estate->plugin_info = plugin_info;
}
PG_CATCH();
{
plugin_info->prev_plugin_info = estate->plugin_info;
estate->plugin_info = plugin_info;
PG_RE_THROW();
}
PG_END_TRY();
}
}
estate->plugin_info = plugin_info;
current_fmgr_plpgsql_cache = NULL;
}
static void
pldbgapi2_func_beg(PLpgSQL_execstate *estate, PLpgSQL_function *func)
{
pldbgapi2_plugin_info *plugin_info = estate->plugin_info;
fmgr_plpgsql_cache *fcache_plpgsql;
int i;
Assert(plugin_info);
if (plugin_info->magic != PLUGIN_INFO_MAGIC)
ereport(ERROR,
(errmsg("bad magic number of pldbgapi2 plpgsql debug api hook"),
errdetail("Some extension using pl debug api does not work correctly.")));
fcache_plpgsql = plugin_info->fcache_plpgsql;
Assert(fcache_plpgsql->magic == FMGR_CACHE_MAGIC);
Assert(fcache_plpgsql);
Assert(fcache_plpgsql->is_plpgsql);
#ifdef USE_ASSERT_CHECKING
if (fcache_plpgsql->funcid != PLpgSQLinlineFunc)
{
Assert(fcache_plpgsql->funcid == func->fn_oid);
Assert(fcache_plpgsql->funcid == estate->func->fn_oid);
}
else
{
Assert(!OidIsValid(func->fn_oid));
Assert(!OidIsValid(estate->func->fn_oid));
}
#endif
current_fmgr_plpgsql_cache = fcache_plpgsql;
for (i = 0; i < nplpgsql_plugins2; i++)
{
if (plpgsql_plugins2[i]->func_beg2)
(plpgsql_plugins2[i]->func_beg2)(estate, func, &fcache_plpgsql->plugin2_info[i]);
}
current_fmgr_plpgsql_cache = NULL;
if (prev_plpgsql_plugin && prev_plpgsql_plugin->func_beg)
{
PG_TRY();
{
estate->plugin_info = plugin_info->prev_plugin_info;
(prev_plpgsql_plugin->func_beg)(estate, func);
plugin_info->prev_plugin_info = estate->plugin_info;
estate->plugin_info = plugin_info;
}
PG_CATCH();
{
plugin_info->prev_plugin_info = estate->plugin_info;
estate->plugin_info = plugin_info;
PG_RE_THROW();
}
PG_END_TRY();
}
}