/**************************************************************************** ** ** This file is part of GAP, a system for computational discrete algebra. ** ** Copyright of GAP belongs to its developers, whose names are too numerous ** to list here. Please refer to the COPYRIGHT file for details. ** ** SPDX-License-Identifier: GPL-2.0-or-later ** ** This file declares the functions of the statements package. ** ** The statements package is the part of the interpreter that executes ** statements for their effects and prints statements.
*/
#ifndef GAP_STATS_H #define GAP_STATS_H
#include"common.h"
/**************************************************************************** ** *V ExecStatFuncs[<type>] . . . . . . executor for statements of type <type> ** ** 'ExecStatFuncs' is the dispatch table that contains for every type of ** statements a pointer to the executor for statements of this type, i.e., ** the function that should be called if a statement of that type is ** executed.
*/ extern ExecStatFunc ExecStatFuncs[256];
/**************************************************************************** ** *F EXEC_STAT(<stat>) . . . . . . . . . . . . . . . . . . execute a statement ** ** 'EXEC_STAT' executes the statement <stat>. ** ** If this causes the execution of a return-value-statement, then ** 'EXEC_STAT' returns 'STATUS_RETURN', and the return value is stored ** in 'STATE(ReturnObjStat)'. If a return-void-statement is executed, then ** 'EXEC_STAT' returns 'STATUS_RETURN' and sets 'STATE(ReturnObjStat)' to ** zero. If a break-statement is executed (which cannot happen if <stat> is ** the body of a function), then 'EXEC_STAT' returns 'STATUS_BREAK', and ** similarly for a continue-statement 'STATUS_CONTINUE' is returned. ** Otherwise 'EXEC_STAT' returns 'STATUS_END'. ** ** 'EXEC_STAT' causes the execution of <stat> by dispatching to the ** executor, i.e., to the function that executes statements of the type of ** <stat>.
*/
ExecStatus EXEC_STAT(Stat stat);
// Executes the current function and returns its return value // if the last statement was STAT_RETURN_OBJ, or null if the last // statement was STAT_RETURN_VOID
Obj EXEC_CURR_FUNC(void);
/**************************************************************************** ** *V IntrExecStatFuncs[<type>] . . . . pseudo executor to handle interrupts ** ** 'IntrExecStatFuncs' is a dispatch table that dispatches to an interrupt ** function for every single entry; it is used in lieu of 'ExecStatFuncs' ** when the normal control flow needs to be interrupted by an external ** event.
*/ extern ExecStatFunc IntrExecStatFuncs[256];
/**************************************************************************** ** *F InterruptExecStat() . . . . . . . . interrupt the execution of statements ** ** 'InterruptExecStat' interrupts the execution of statements at the next ** possible moment. It is called from 'SyAnsIntr' if an interrupt signal is ** received. It is never called on systems that do not support signals. On ** those systems the executors test 'SyIsIntr' at regular intervals.
*/ void InterruptExecStat(void);
/**************************************************************************** ** *F PrintStat(<stat>) . . . . . . . . . . . . . . . . . . . print a statement ** ** 'PrintStat' prints the statements <stat>. ** ** 'PrintStat' simply dispatches through the table 'PrintStatFuncs' to the ** appropriate printer.
*/ void PrintStat(Stat stat);
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