Function plpgsql_exec_function

src/pl/plpgsql/src/pl_exec.c:469–784

---------- * plpgsql_exec_function Called by the call handler for * function execution. * * This is also used to execute inline code blocks (DO blocks). The only * difference that this code is aware of is that for a DO block, we want * to use a private simple_eval_estate and a private simple_eval_resowner, * which are created and passed in by the caller. For regular functions, * pass

 * ----------
 */
Datum
plpgsql_exec_function(PLpgSQL_function *func, FunctionCallInfo fcinfo,
					  EState *simple_eval_estate,
					  ResourceOwner simple_eval_resowner,
					  ResourceOwner procedure_resowner,
					  bool atomic)
{
	PLpgSQL_execstate estate;
	ErrorContextCallback plerrcontext;
	int			i;
	int			rc;

	/*
	 * Setup the execution state
	 */
	plpgsql_estate_setup(&estate, func, (ReturnSetInfo *) fcinfo->resultinfo,
						 simple_eval_estate, simple_eval_resowner);
	estate.procedure_resowner = procedure_resowner;
	estate.atomic = atomic;

	/*
	 * Setup error traceback support for ereport()
	 */
	plerrcontext.callback = plpgsql_exec_error_callback;
	plerrcontext.arg = &estate;
	plerrcontext.previous = error_context_stack;
	error_context_stack = &plerrcontext;

	/*
	 * Make local execution copies of all the datums
	 */
	estate.err_text = gettext_noop("during initialization of execution state");
	copy_plpgsql_datums(&estate, func);

	/*
	 * Store the actual call argument values into the appropriate variables
	 */
	estate.err_text = gettext_noop("while storing call arguments into local variables");
	for (i = 0; i < func->fn_nargs; i++)
	{
		int			n = func->fn_argvarnos[i];

		switch (estate.datums[n]->dtype)
		{
			case PLPGSQL_DTYPE_VAR:
				{
					PLpgSQL_var *var = (PLpgSQL_var *) estate.datums[n];

					assign_simple_var(&estate, var,
									  fcinfo->args[i].value,
									  fcinfo->args[i].isnull,
									  false);

					/*
					 * Force any array-valued parameter to be stored in
					 * expanded form in our local variable, in hopes of
					 * improving efficiency of uses of the variable.  (This is
					 * a hack, really: why only arrays? Need more thought