jam.c #1

/*
 * /+\
 * +\	Copyright 1993, 2000 Christopher Seiwald.
 * \+/
 *
 * This file is part of jam.
 *
 * License is hereby granted to use this software and distribute it
 * freely, as long as this copyright notice is retained and modifications 
 * are clearly marked.
 *
 * ALL WARRANTIES ARE HEREBY DISCLAIMED.
 */

/*
 * jam.c - make redux
 *
 * See Jam.html and Jamlang.html for usage information.
 *
 * These comments document the code.
 *
 * The top half of the code is structured such:
 *
 *                       jam 
 *                      / | \ 
 *                 +---+  |  \
 *                /       |   \ 
 *         jamgram     option  \ 
 *        /  |   \              \
 *       /   |    \              \
 *      /    |     \             |
 *  scan     |     compile      make
 *   |       |    /    \       / |  \
 *   |       |   /      \     /  |   \
 *   |       |  /        \   /   |    \
 * jambase parse         rules  search make1
 *                               |	|   \
 *                               |	|    \
 *                               |	|     \
 *                           timestamp command execute
 *
 *
 * The support routines are called by all of the above, but themselves
 * are layered thus:
 *
 *                     variable|expand
 *                      /  |   |   |
 *                     /   |   |   |
 *                    /    |   |   |
 *                 lists   |   |   filesys
 *                    \    |   |
 *                     \   |   |
 *                      \  |   |
 *                     newstr  |
 *                        \    |
 *                         \   |
 *                          \  |
 *                          hash
 *
 * Roughly, the modules are:
 *
 *	command.c - maintain lists of commands
 *	compile.c - compile parsed jam statements
 *	execunix.c - execute a shell script on UNIX
 *	execvms.c - execute a shell script, ala VMS
 *	expand.c - expand a buffer, given variable values
 *	fileunix.c - manipulate file names and scan directories on UNIX
 *	filevms.c - manipulate file names and scan directories on VMS
 *	hash.c - simple in-memory hashing routines 
 *	headers.c - handle #includes in source files
 *	jambase.c - compilable copy of Jambase
 *	jamgram.y - jam grammar
 *	lists.c - maintain lists of strings
 *	make.c - bring a target up to date, once rules are in place
 *	make1.c - execute command to bring targets up to date
 *	newstr.c - string manipulation routines
 *	option.c - command line option processing
 *	parse.c - make and destroy parse trees as driven by the parser
 *	regexp.c - Henry Spencer's regexp
 *	rules.c - access to RULEs, TARGETs, and ACTIONs
 *	scan.c - the jam yacc scanner
 *	search.c - find a target along $(SEARCH) or $(LOCATE) 
 *	timestamp.c - get the timestamp of a file or archive member
 *	variable.c - handle jam multi-element variables
 *
 * 05/04/94 (seiwald) - async multiprocess (-j) support
 * 02/08/95 (seiwald) - -n implies -d2.
 * 02/22/95 (seiwald) - -v for version info.
 * 09/11/00 (seiwald) - PATCHLEVEL folded into VERSION.
 */

# include "jam.h"
# include "option.h"
# include "patchlevel.h"

/* These get various function declarations. */

# include "lists.h"
# include "parse.h"
# include "variable.h"
# include "compile.h"
# include "rules.h"
# include "newstr.h"
# include "scan.h"
# include "timestamp.h"
# include "make.h"

/* Macintosh is "special" */

# ifdef OS_MAC
# include <QuickDraw.h>
# endif

/* And UNIX for this */

# ifdef unix
# include <sys/utsname.h>
# endif

struct globs globs = {
	0,			/* noexec */
	1,			/* jobs */
# ifdef OS_MAC
	{ 0, 0 },		/* debug - suppress tracing output */
# else
	{ 0, 1 }, 		/* debug ... */
# endif
	0,			/* output commands, not run them */
	1			/* CWM.  Always scanheaders by default */
} ;

/* Symbols to be defined as true for use in Jambase */

static char *othersyms[] = { OSMAJOR, OSMINOR, OSPLAT, JAMVERSYM, 0 } ;

/* Known for sure: 
 *	mac needs arg_enviro
 *	OS2 needs extern environ
 */

# ifdef OS_MAC
# define use_environ arg_environ
# ifdef MPW
QDGlobals qd;
# endif
# endif

# ifndef use_environ
# define use_environ environ
# if !defined( __WATCOM__ ) && !defined( OS_OS2 ) && !defined( OS_NT ) 
extern char **environ;
# endif
# endif

main( int argc, char **argv, char **arg_environ )
{
	int		n;
	char		*s;
	struct option	optv[N_OPTS];
	char		*all = "all";
	int		anyhow = 0;
	int		status;

# ifdef OS_MAC
	InitGraf(&qd.thePort);
# endif

	argc--, argv++;

#ifndef OPT_HEADER_OPTION_EXT
	if( ( n = getoptions( argc, argv, "d:j:f:s:t:ano:v", optv ) ) < 0 )
#else
	if( ( n = getoptions( argc, argv, "d:j:f:s:t:ano:vp", optv ) ) < 0 )
#endif
	{
	    printf( "\nusage: jam [ options ] targets...\n\n" );

            printf( "-a      Build all targets, even if they are current.\n" );
            printf( "-dx     Set the debug level to x (0-9).\n" );
            printf( "-fx     Read x instead of Jambase.\n" );
            printf( "-jx     Run up to x shell commands concurrently.\n" );
            printf( "-n      Don't actually execute the updating actions.\n" );
            printf( "-ox     Write the updating actions to file x.\n" );
#ifdef OPT_HEADER_OPTION_EXT
	    printf( "-p      Partial build.  Ignore header dependencies\n");
#endif
	    printf( "-sx=y   Set variable x=y, overriding environment.\n" );
	    printf( "-tx     Rebuild x, even if it is up-to-date.\n" );
	    printf( "-v      Print the version of jam and exit.\n\n" );
	    printf( "\n" );

	    /* CWM - Added help on debug levels */
	    printf( "The debug levels are:\n" );
	    printf( "  1 - show make actions when executed\n" );
	    printf( "  2 - show text of actions\n" );
	    printf( "  3 - show progress of make.  Show files when bound\n" );
	    printf( "  4 - show execcmds()'s work\n" );
	    printf( "  5 - show rule invocations\n" );
	    printf( "  6 - show header scan, dir scan, attempts at binding\n" );
	    printf( "  7 - show variable setting\n" );
	    printf( "  8 - show variable fetches and expansions.  "
		    "show 'if' calculations\n" );
	    printf( "  9 - show scanner tokens.  Show memory use\n" );
#ifdef OPT_GRAPH_DEBUG_EXT
	    printf( " 10 - dump dependency graph before starting build\n" );
	    printf( " 11 - show changes to a targets fate in make0()\n" );
#endif
	    printf( "\n" );
	    printf( "  To select individual debug levels, try:  -d+n -d+n...\n" );

	    exit( EXITBAD );
	}

	argc -= n, argv += n;

	/* Version info. */

	if( ( s = getoptval( optv, 'v', 0 ) ) )
	{
	    printf( "Jam/MR  " );
	    printf( "Version %s.  ", VERSION );
	    printf( "Copyright 1993, 2000 Christopher Seiwald.  " );
	    printf( "%s.\n", OSMINOR );

	    return EXITOK;
	}

	/* Pick up interesting options */

	if( ( s = getoptval( optv, 'n', 0 ) ) )
	    globs.noexec++, globs.debug[2] = 1;

	if( ( s = getoptval( optv, 'a', 0 ) ) )
	    anyhow++;

#ifdef OPT_HEADER_OPTION_EXT
	if( ( s = getoptval( optv, 'p', 0 ) ) )
	    globs.scanheaders = 0;
#endif

	if( ( s = getoptval( optv, 'j', 0 ) ) )
	    globs.jobs = atoi( s );

	/* Turn on/off debugging */

	for( n = 0; s = getoptval( optv, 'd', n ); n++ )
	{
	    int i;

	    /* First -d, turn off defaults. */

	    if( !n )
		for( i = 0; i < DEBUG_MAX; i++ )
		    globs.debug[i] = 0;

	    i = atoi( s );

	    if( i < 0 || i >= DEBUG_MAX )
	    {
		printf( "Invalid debug level '%s'.\n", s );
		continue;
	    }

	    /* n turns on levels 1-n */
	    /* +n turns on level n */

	    if( *s == '+' )
		globs.debug[i] = 1;
	    else while( i )
		globs.debug[i--] = 1;
	}

	/* Set JAMDATE first */

	{
	    char *date;
	    time_t clock;
	    time( &clock );
	    date = newstr( ctime( &clock ) );

	    /* Trim newline from date */

	    if( strlen( date ) == 25 )
		date[ 24 ] = 0;

	    var_set( "JAMDATE", list_new( L0, newstr( date ) ), VAR_SET );

#ifdef OPT_TIME_STAMP_OUTPUT_EXT
	    printf( "...starting...%s", ctime ( &clock ) );
#endif

	}

	/* And JAMUNAME */
# ifdef unix
	{
	    struct utsname u;

	    if( uname( &u ) >= 0 )
	    {
		var_set( "JAMUNAME", 
			list_new( 
			list_new(
			list_new(
			list_new(
			list_new( L0, 
				newstr( u.sysname ) ),
				newstr( u.nodename ) ),
				newstr( u.release ) ),
				newstr( u.version ) ),
				newstr( u.machine ) ), VAR_SET );
	    }
	}
# endif /* unix */

	/*
	 * Jam defined variables OS, OSPLAT
	 */

	var_defines( othersyms );

	/* load up environment variables */

	var_defines( use_environ );

	/* Load up variables set on command line. */

	for( n = 0; s = getoptval( optv, 's', n ); n++ )
	{
	    char *symv[2];
	    symv[0] = s;
	    symv[1] = 0;
	    var_defines( symv );
	}

	/* Initialize builtins */

	compile_builtins();

#ifdef OPT_JOB_SLOT_EXT
		/* Silently enforce maximum to be two digits */
		/* Test against 99 rather than MAXJOBS, as the intent of */
		/* this is to protect the fixed size buffers. MAXJOBS is */
		/* enforced elsewhere. */
		if( globs.jobs > 99 )
			globs.jobs = 99;
#endif

#ifdef OPT_EXPORT_JOBNUM_EXT
	{
		LIST *l = 0;
		int i;
	    char num[3];

		/* The number could be negative if the user is trying to be nasty */
		if( globs.jobs < 1 )
			globs.jobs = 1;

	    /* How many jobs are we allowed to spawn? */
	    sprintf( num, "%d", globs.jobs );
	    var_set( "JAM_NUM_JOBS", list_new( 0, newstr( num )), VAR_SET );

	    /* An easy test to see if there are multiple jobs */
		if( globs.jobs > 1 )
			var_set( "JAM_MULTI_JOBS", list_new( 0, newstr( num )), VAR_SET );

		/* Create a list of the job nums. ie, -j4 -> 0 1 2 3 */
		for( i = 0; i < globs.jobs; ++i )
		{
			sprintf( num, "%d", i );
			l = list_new( l, newstr( num ) );
		}
	    var_set( "JAM_JOB_LIST", l, VAR_SET );
	}
#endif

	/* Parse ruleset */

	for( n = 0; s = getoptval( optv, 'f', n ); n++ )
	    parse_file( s );

	if( !n )
	    parse_file( "+" );

	status = yyanyerrors();

	/* Manually touch -t targets */

	for( n = 0; s = getoptval( optv, 't', n ); n++ )
	    touchtarget( s );

	/* If an output file is specified, set globs.cmdout to that */

	if( s = getoptval( optv, 'o', 0 ) )
	{
	    if( !( globs.cmdout = fopen( s, "w" ) ) )
	    {
		printf( "Failed to write to '%s'\n", s );
		exit( EXITBAD );
	    }
	    globs.noexec++;
	}

	/* Now make target */

	if( !argc )
	    status |= make( 1, &all, anyhow );
	else
	    status |= make( argc, argv, anyhow );

	/* Widely scattered cleanup */

	var_done();
	donerules();
	donestamps();
	donestr();

	/* close cmdout */

	if( globs.cmdout )
	    fclose( globs.cmdout );

#ifdef OPT_TIME_STAMP_OUTPUT_EXT
	{
	    time_t clock;
	    time( &clock );
		printf( "...finished...%s", ctime ( &clock ) );
	}
#endif

	return status ? EXITBAD : EXITOK;
}