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1 | /* |
2 | * Copyright 1994 Christopher Seiwald. | |
3 | * | |
4 | * This file is part of Jam - see jam.c for Copyright information. | |
5 | */ | |
6 | ||
7 | /* | |
8 | * command.h - the CMD structure and routines to manipulate them | |
9 | * | |
10 | * Both ACTION and CMD contain a rule, targets, and sources. An | |
11 | * ACTION describes a rule to be applied to the given targets and | |
12 | * sources; a CMD is what actually gets executed by the shell. The | |
13 | * differences are due to: | |
14 | * | |
15 | * ACTIONS must be combined if 'actions together' is given. | |
16 | * ACTIONS must be split if 'actions piecemeal' is given. | |
17 | * ACTIONS must have current sources omitted for 'actions updated'. | |
18 | * | |
19 | * The CMD datatype holds a single command that is to be executed | |
20 | * against a target, and they can chain together to represent the | |
21 | * full collection of commands used to update a target. | |
22 | * | |
23 | * Structures: | |
24 | * | |
25 | * CMD - an action, ready to be formatted into a buffer and executed. | |
26 | * | |
27 | * External routines: | |
28 | * | |
29 | * cmd_new() - return a new CMD or 0 if too many args. | |
30 | * cmd_free() - delete CMD and its parts. | |
31 | * cmd_next() - walk the CMD chain. | |
32 | * cmd_release_targets_and_shell() - CMD forgets about its targets & shell. | |
33 | */ | |
34 | ||
35 | ||
36 | /* | |
37 | * CMD - an action, ready to be formatted into a buffer and executed. | |
38 | */ | |
39 | ||
40 | #ifndef COMMAND_SW20111118_H | |
41 | #define COMMAND_SW20111118_H | |
42 | ||
43 | #include "lists.h" | |
44 | #include "rules.h" | |
45 | #include "strings.h" | |
46 | ||
47 | ||
48 | typedef struct _cmd CMD; | |
49 | ||
50 | /* | |
51 | * A list whose elements are either TARGETS or CMDS. | |
52 | * CMDLIST is used only by CMD. A TARGET means that | |
53 | * the CMD is the last updating action required to | |
54 | * build the target. A CMD is the next CMD required | |
55 | * to build the same target. (Note that a single action | |
56 | * can update more than one target, so the CMDs form | |
57 | * a DAG, not a straight linear list.) | |
58 | */ | |
59 | typedef struct _cmdlist { | |
60 | struct _cmdlist * next; | |
61 | union { | |
62 | CMD * cmd; | |
63 | TARGET * t; | |
64 | } impl; | |
65 | char iscmd; | |
66 | } CMDLIST; | |
67 | ||
68 | CMDLIST * cmdlist_append_cmd( CMDLIST *, CMD * ); | |
69 | CMDLIST * cmdlist_append_target( CMDLIST *, TARGET * ); | |
70 | void cmd_list_free( CMDLIST * ); | |
71 | ||
72 | struct _cmd | |
73 | { | |
74 | CMDLIST * next; | |
75 | RULE * rule; /* rule->actions contains shell script */ | |
76 | LIST * shell; /* $(JAMSHELL) value */ | |
77 | LOL args; /* LISTs for $(<), $(>) */ | |
78 | string buf[ 1 ]; /* actual commands */ | |
79 | int noop; /* no-op commands should be faked instead of executed */ | |
80 | int asynccnt; /* number of outstanding dependencies */ | |
81 | TARGETS * lock; /* semaphores that are required by this cmd. */ | |
82 | TARGETS * unlock; /* semaphores that are released when this cmd finishes. */ | |
83 | char status; /* the command status */ | |
84 | }; | |
85 | ||
86 | CMD * cmd_new | |
87 | ( | |
88 | RULE * rule, /* rule (referenced) */ | |
89 | LIST * targets, /* $(<) (ownership transferred) */ | |
90 | LIST * sources, /* $(>) (ownership transferred) */ | |
91 | LIST * shell /* $(JAMSHELL) (ownership transferred) */ | |
92 | ); | |
93 | ||
94 | void cmd_release_targets_and_shell( CMD * ); | |
95 | ||
96 | void cmd_free( CMD * ); | |
97 | ||
98 | #define cmd_next( c ) ((c)->next) | |
99 | ||
100 | #endif |