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/*
* Copyright 1994 Christopher Seiwald.
*
* This file is part of Jam - see jam.c for Copyright information.
*/
/*
* command.h - the CMD structure and routines to manipulate them
*
* Both ACTION and CMD contain a rule, targets, and sources. An
* ACTION describes a rule to be applied to the given targets and
* sources; a CMD is what actually gets executed by the shell. The
* differences are due to:
*
* ACTIONS must be combined if 'actions together' is given.
* ACTIONS must be split if 'actions piecemeal' is given.
* ACTIONS must have current sources omitted for 'actions updated'.
*
* The CMD datatype holds a single command that is to be executed
* against a target, and they can chain together to represent the
* full collection of commands used to update a target.
*
* Structures:
*
* CMD - an action, ready to be formatted into a buffer and executed.
*
* External routines:
*
* cmd_new() - return a new CMD or 0 if too many args.
* cmd_free() - delete CMD and its parts.
* cmd_next() - walk the CMD chain.
* cmd_release_targets_and_shell() - CMD forgets about its targets & shell.
*/
/*
* CMD - an action, ready to be formatted into a buffer and executed.
*/
#ifndef COMMAND_SW20111118_H
#define COMMAND_SW20111118_H
#include "lists.h"
#include "rules.h"
#include "strings.h"
typedef struct _cmd CMD;
/*
* A list whose elements are either TARGETS or CMDS.
* CMDLIST is used only by CMD. A TARGET means that
* the CMD is the last updating action required to
* build the target. A CMD is the next CMD required
* to build the same target. (Note that a single action
* can update more than one target, so the CMDs form
* a DAG, not a straight linear list.)
*/
typedef struct _cmdlist {
struct _cmdlist * next;
union {
CMD * cmd;
TARGET * t;
} impl;
char iscmd;
} CMDLIST;
CMDLIST * cmdlist_append_cmd( CMDLIST *, CMD * );
CMDLIST * cmdlist_append_target( CMDLIST *, TARGET * );
void cmd_list_free( CMDLIST * );
struct _cmd
{
CMDLIST * next;
RULE * rule; /* rule->actions contains shell script */
LIST * shell; /* $(JAMSHELL) value */
LOL args; /* LISTs for $(<), $(>) */
string buf[ 1 ]; /* actual commands */
int noop; /* no-op commands should be faked instead of executed */
int asynccnt; /* number of outstanding dependencies */
TARGETS * lock; /* semaphores that are required by this cmd. */
TARGETS * unlock; /* semaphores that are released when this cmd finishes. */
char status; /* the command status */
};
CMD * cmd_new
(
RULE * rule, /* rule (referenced) */
LIST * targets, /* $(<) (ownership transferred) */
LIST * sources, /* $(>) (ownership transferred) */
LIST * shell /* $(JAMSHELL) (ownership transferred) */
);
void cmd_release_targets_and_shell( CMD * );
void cmd_free( CMD * );
#define cmd_next( c ) ((c)->next)
#endif
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