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Diffstat (limited to 'jam-files/engine/make.c')
| -rw-r--r-- | jam-files/engine/make.c | 814 |
1 files changed, 814 insertions, 0 deletions
diff --git a/jam-files/engine/make.c b/jam-files/engine/make.c new file mode 100644 index 00000000..c871f0be --- /dev/null +++ b/jam-files/engine/make.c @@ -0,0 +1,814 @@ +/* + * Copyright 1993, 1995 Christopher Seiwald. + * + * This file is part of Jam - see jam.c for Copyright information. + */ + +/* This file is ALSO: + * Copyright 2001-2004 David Abrahams. + * Distributed under the Boost Software License, Version 1.0. + * (See accompanying file LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt) + */ + +/* + * make.c - bring a target up to date, once rules are in place. + * + * This modules controls the execution of rules to bring a target and its + * dependencies up to date. It is invoked after the targets, rules, et. al. + * described in rules.h are created by the interpreting jam files. + * + * This file contains the main make() entry point and the first pass make0(). + * The second pass, make1(), which actually does the command execution, is in + * make1.c. + * + * External routines: + * make() - make a target, given its name + * + * Internal routines: + * make0() - bind and scan everything to make a TARGET + * make0sort() - reorder TARGETS chain by their time (newest to oldest) + * + * 12/26/93 (seiwald) - allow NOTIME targets to be expanded via $(<), $(>). + * 01/04/94 (seiwald) - print all targets, bounded, when tracing commands. + * 04/08/94 (seiwald) - progress report now reflects only targets with actions. + * 04/11/94 (seiwald) - Combined deps & headers into deps[2] in TARGET. + * 12/20/94 (seiwald) - NOTIME renamed NOTFILE. + * 12/20/94 (seiwald) - make0() headers after determining fate of target, so + * that headers are not seen as being dependent on + * themselves. + * 01/19/95 (seiwald) - distinguish between CANTFIND/CANTMAKE targets. + * 02/02/95 (seiwald) - propagate leaf source time for new LEAVES rule. + * 02/14/95 (seiwald) - NOUPDATE rule means don't update existing target. + * 08/22/95 (seiwald) - NOUPDATE targets immune to anyhow (-a) flag. + * 09/06/00 (seiwald) - NOCARE affects targets with sources/actions. + * 03/02/01 (seiwald) - reverse NOCARE change. + * 03/14/02 (seiwald) - TEMPORARY targets no longer take on parents age. + * 03/16/02 (seiwald) - support for -g (reorder builds by source time). + */ + +#include "jam.h" + +#include "lists.h" +#include "parse.h" +#include "variable.h" +#include "rules.h" + +#ifdef OPT_HEADER_CACHE_EXT + #include "hcache.h" +#endif + +#include "search.h" +#include "newstr.h" +#include "make.h" +#include "headers.h" +#include "command.h" +#include <assert.h> + +#ifndef max + #define max( a,b ) ((a)>(b)?(a):(b)) +#endif + +static TARGETS * make0sort( TARGETS * c ); + +#ifdef OPT_GRAPH_DEBUG_EXT + static void dependGraphOutput( TARGET * t, int depth ); +#endif + +static const char * target_fate[] = +{ + "init", /* T_FATE_INIT */ + "making", /* T_FATE_MAKING */ + "stable", /* T_FATE_STABLE */ + "newer", /* T_FATE_NEWER */ + "temp", /* T_FATE_ISTMP */ + "touched", /* T_FATE_TOUCHED */ + "rebuild", /* T_FATE_REBUILD */ + "missing", /* T_FATE_MISSING */ + "needtmp", /* T_FATE_NEEDTMP */ + "old", /* T_FATE_OUTDATED */ + "update", /* T_FATE_UPDATE */ + "nofind", /* T_FATE_CANTFIND */ + "nomake" /* T_FATE_CANTMAKE */ +}; + +static const char * target_bind[] = +{ + "unbound", + "missing", + "parents", + "exists", +}; + +# define spaces(x) ( " " + ( x > 20 ? 0 : 20-x ) ) + + +/* + * make() - make a target, given its name. + */ + +int make( int n_targets, char const * * targets, int anyhow ) +{ + int i; + COUNTS counts[ 1 ]; + int status = 0; /* 1 if anything fails */ + +#ifdef OPT_HEADER_CACHE_EXT + hcache_init(); +#endif + + memset( (char *)counts, 0, sizeof( *counts ) ); + + /* First bind all targets with LOCATE_TARGET setting. This is needed to + * correctly handle dependencies to generated headers. + */ + bind_explicitly_located_targets(); + + { + PROFILE_ENTER( MAKE_MAKE0 ); + for ( i = 0; i < n_targets; ++i ) + make0( bindtarget( targets[ i ] ), 0, 0, counts, anyhow ); + PROFILE_EXIT( MAKE_MAKE0 ); + } + +#ifdef OPT_GRAPH_DEBUG_EXT + if ( DEBUG_GRAPH ) + for ( i = 0; i < n_targets; ++i ) + dependGraphOutput( bindtarget( targets[ i ] ), 0 ); +#endif + + if ( DEBUG_MAKE ) + { + if ( counts->targets ) + printf( "...found %d target%s...\n", counts->targets, + counts->targets > 1 ? "s" : "" ); + if ( counts->temp ) + printf( "...using %d temp target%s...\n", counts->temp, + counts->temp > 1 ? "s" : "" ); + if ( counts->updating ) + printf( "...updating %d target%s...\n", counts->updating, + counts->updating > 1 ? "s" : "" ); + if ( counts->cantfind ) + printf( "...can't find %d target%s...\n", counts->cantfind, + counts->cantfind > 1 ? "s" : "" ); + if ( counts->cantmake ) + printf( "...can't make %d target%s...\n", counts->cantmake, + counts->cantmake > 1 ? "s" : "" ); + } + +#ifdef OPT_HEADER_CACHE_EXT + hcache_done(); +#endif + + status = counts->cantfind || counts->cantmake; + + { + PROFILE_ENTER( MAKE_MAKE1 ); + for ( i = 0; i < n_targets; ++i ) + status |= make1( bindtarget( targets[ i ] ) ); + PROFILE_EXIT( MAKE_MAKE1 ); + } + + return status; +} + + +/* Force any dependants of t that have already at least begun being visited by + * make0() to be updated. + */ + +static void update_dependants( TARGET * t ) +{ + TARGETS * q; + + for ( q = t->dependants; q; q = q->next ) + { + TARGET * p = q->target; + char fate0 = p->fate; + + /* If we have already at least begun visiting it and we are not already + * rebuilding it for other reasons. + */ + if ( ( fate0 != T_FATE_INIT ) && ( fate0 < T_FATE_BUILD ) ) + { + p->fate = T_FATE_UPDATE; + + if ( DEBUG_FATE ) + { + printf( "fate change %s from %s to %s (as dependant of %s)\n", + p->name, target_fate[ (int) fate0 ], target_fate[ (int) p->fate ], t->name ); + } + + /* If we are done visiting it, go back and make sure its dependants + * get rebuilt. + */ + if ( fate0 > T_FATE_MAKING ) + update_dependants( p ); + } + } +} + + +/* + * Make sure that all of t's rebuilds get rebuilt. + */ + +static void force_rebuilds( TARGET * t ) +{ + TARGETS * d; + for ( d = t->rebuilds; d; d = d->next ) + { + TARGET * r = d->target; + + /* If it is not already being rebuilt for other reasons. */ + if ( r->fate < T_FATE_BUILD ) + { + if ( DEBUG_FATE ) + printf( "fate change %s from %s to %s (by rebuild)\n", + r->name, target_fate[ (int) r->fate ], target_fate[ T_FATE_REBUILD ] ); + + /* Force rebuild it. */ + r->fate = T_FATE_REBUILD; + + /* And make sure its dependants are updated too. */ + update_dependants( r ); + } + } +} + + +/* + * make0() - bind and scan everything to make a TARGET. + * + * Recursively binds a target, searches for #included headers, calls itself on + * those headers and any dependencies. + */ + +void make0 +( + TARGET * t, + TARGET * p, /* parent */ + int depth, /* for display purposes */ + COUNTS * counts, /* for reporting */ + int anyhow +) /* forcibly touch all (real) targets */ +{ + TARGETS * c; + TARGET * ptime = t; + time_t last; + time_t leaf; + time_t hlast; + int fate; + char const * flag = ""; + SETTINGS * s; + +#ifdef OPT_GRAPH_DEBUG_EXT + int savedFate, oldTimeStamp; +#endif + + if ( DEBUG_MAKEPROG ) + printf( "make\t--\t%s%s\n", spaces( depth ), t->name ); + + /* + * Step 1: initialize + */ + + if ( DEBUG_MAKEPROG ) + printf( "make\t--\t%s%s\n", spaces( depth ), t->name ); + + t->fate = T_FATE_MAKING; + + /* + * Step 2: under the influence of "on target" variables, + * bind the target and search for headers. + */ + + /* Step 2a: set "on target" variables. */ + s = copysettings( t->settings ); + pushsettings( s ); + + /* Step 2b: find and timestamp the target file (if it is a file). */ + if ( ( t->binding == T_BIND_UNBOUND ) && !( t->flags & T_FLAG_NOTFILE ) ) + { + char * another_target; + t->boundname = search( t->name, &t->time, &another_target, + t->flags & T_FLAG_ISFILE ); + /* If it was detected that this target refers to an already existing and + * bound one, we add an include dependency, so that every target + * depending on us will depend on that other target as well. + */ + if ( another_target ) + target_include( t, bindtarget( another_target ) ); + + t->binding = t->time ? T_BIND_EXISTS : T_BIND_MISSING; + } + + /* INTERNAL, NOTFILE header nodes have the time of their parents. */ + if ( p && ( t->flags & T_FLAG_INTERNAL ) ) + ptime = p; + + /* If temp file does not exist but parent does, use parent. */ + if ( p && ( t->flags & T_FLAG_TEMP ) && + ( t->binding == T_BIND_MISSING ) && + ( p->binding != T_BIND_MISSING ) ) + { + t->binding = T_BIND_PARENTS; + ptime = p; + } + +#ifdef OPT_SEMAPHORE + { + LIST * var = var_get( "JAM_SEMAPHORE" ); + if ( var ) + { + TARGET * semaphore = bindtarget( var->string ); + semaphore->progress = T_MAKE_SEMAPHORE; + t->semaphore = semaphore; + } + } +#endif + + /* Step 2c: If its a file, search for headers. */ + if ( t->binding == T_BIND_EXISTS ) + headers( t ); + + /* Step 2d: reset "on target" variables. */ + popsettings( s ); + freesettings( s ); + + /* + * Pause for a little progress reporting . + */ + + if ( DEBUG_BIND ) + { + if ( strcmp( t->name, t->boundname ) ) + printf( "bind\t--\t%s%s: %s\n", + spaces( depth ), t->name, t->boundname ); + + switch ( t->binding ) + { + case T_BIND_UNBOUND: + case T_BIND_MISSING: + case T_BIND_PARENTS: + printf( "time\t--\t%s%s: %s\n", + spaces( depth ), t->name, target_bind[ (int) t->binding ] ); + break; + + case T_BIND_EXISTS: + printf( "time\t--\t%s%s: %s", + spaces( depth ), t->name, ctime( &t->time ) ); + break; + } + } + + /* + * Step 3: recursively make0() dependencies & headers. + */ + + /* Step 3a: recursively make0() dependencies. */ + for ( c = t->depends; c; c = c->next ) + { + int internal = t->flags & T_FLAG_INTERNAL; + + /* Warn about circular deps, except for includes, which include each + * other alot. + */ + if ( c->target->fate == T_FATE_INIT ) + make0( c->target, ptime, depth + 1, counts, anyhow ); + else if ( c->target->fate == T_FATE_MAKING && !internal ) + printf( "warning: %s depends on itself\n", c->target->name ); + } + + /* Step 3b: recursively make0() internal includes node. */ + if ( t->includes ) + make0( t->includes, p, depth + 1, counts, anyhow ); + + /* Step 3c: add dependencies' includes to our direct dependencies. */ + { + TARGETS * incs = 0; + for ( c = t->depends; c; c = c->next ) + if ( c->target->includes ) + incs = targetentry( incs, c->target->includes ); + t->depends = targetchain( t->depends, incs ); + } + + /* + * Step 4: compute time & fate + */ + + /* Step 4a: pick up dependencies' time and fate */ + last = 0; + leaf = 0; + fate = T_FATE_STABLE; + for ( c = t->depends; c; c = c->next ) + { + /* If LEAVES has been applied, we only heed the timestamps of the leaf + * source nodes. + */ + leaf = max( leaf, c->target->leaf ); + + if ( t->flags & T_FLAG_LEAVES ) + { + last = leaf; + continue; + } + + last = max( last, c->target->time ); + fate = max( fate, c->target->fate ); + +#ifdef OPT_GRAPH_DEBUG_EXT + if ( DEBUG_FATE ) + if ( fate < c->target->fate ) + printf( "fate change %s from %s to %s by dependency %s\n", + t->name, target_fate[(int) fate], target_fate[(int) c->target->fate], + c->target->name ); +#endif + } + + /* Step 4b: pick up included headers time */ + + /* + * If a header is newer than a temp source that includes it, + * the temp source will need building. + */ + + hlast = t->includes ? t->includes->time : 0; + + /* Step 4c: handle NOUPDATE oddity. + * + * If a NOUPDATE file exists, mark it as having eternally old dependencies. + * Do not inherit our fate from our dependencies. Decide fate based only on + * other flags and our binding (done later). + */ + if ( t->flags & T_FLAG_NOUPDATE ) + { +#ifdef OPT_GRAPH_DEBUG_EXT + if ( DEBUG_FATE ) + if ( fate != T_FATE_STABLE ) + printf( "fate change %s back to stable, NOUPDATE.\n", t->name + ); +#endif + + last = 0; + t->time = 0; + + /* Do not inherit our fate from our dependencies. Decide fate based only + * upon other flags and our binding (done later). + */ + fate = T_FATE_STABLE; + } + + /* Step 4d: determine fate: rebuild target or what? */ + + /* + In English: + If can not find or make child, can not make target. + If children changed, make target. + If target missing, make it. + If children newer, make target. + If temp's children newer than parent, make temp. + If temp's headers newer than parent, make temp. + If deliberately touched, make it. + If up-to-date temp file present, use it. + If target newer than non-notfile parent, mark target newer. + Otherwise, stable! + + Note this block runs from least to most stable: + as we make it further down the list, the target's + fate is getting stabler. + */ + +#ifdef OPT_GRAPH_DEBUG_EXT + savedFate = fate; + oldTimeStamp = 0; +#endif + + if ( fate >= T_FATE_BROKEN ) + { + fate = T_FATE_CANTMAKE; + } + else if ( fate >= T_FATE_SPOIL ) + { + fate = T_FATE_UPDATE; + } + else if ( t->binding == T_BIND_MISSING ) + { + fate = T_FATE_MISSING; + } + else if ( ( t->binding == T_BIND_EXISTS ) && ( last > t->time ) ) + { +#ifdef OPT_GRAPH_DEBUG_EXT + oldTimeStamp = 1; +#endif + fate = T_FATE_OUTDATED; + } + else if ( ( t->binding == T_BIND_PARENTS ) && ( last > p->time ) ) + { +#ifdef OPT_GRAPH_DEBUG_EXT + oldTimeStamp = 1; +#endif + fate = T_FATE_NEEDTMP; + } + else if ( ( t->binding == T_BIND_PARENTS ) && ( hlast > p->time ) ) + { + fate = T_FATE_NEEDTMP; + } + else if ( t->flags & T_FLAG_TOUCHED ) + { + fate = T_FATE_TOUCHED; + } + else if ( anyhow && !( t->flags & T_FLAG_NOUPDATE ) ) + { + fate = T_FATE_TOUCHED; + } + else if ( ( t->binding == T_BIND_EXISTS ) && ( t->flags & T_FLAG_TEMP ) ) + { + fate = T_FATE_ISTMP; + } + else if ( ( t->binding == T_BIND_EXISTS ) && p && + ( p->binding != T_BIND_UNBOUND ) && ( t->time > p->time ) ) + { +#ifdef OPT_GRAPH_DEBUG_EXT + oldTimeStamp = 1; +#endif + fate = T_FATE_NEWER; + } + else + { + fate = T_FATE_STABLE; + } +#ifdef OPT_GRAPH_DEBUG_EXT + if ( DEBUG_FATE && ( fate != savedFate ) ) + { + if ( savedFate == T_FATE_STABLE ) + printf( "fate change %s set to %s%s\n", t->name, + target_fate[ fate ], oldTimeStamp ? " (by timestamp)" : "" ); + else + printf( "fate change %s from %s to %s%s\n", t->name, + target_fate[ savedFate ], target_fate[ fate ], + oldTimeStamp ? " (by timestamp)" : "" ); + } +#endif + + /* Step 4e: handle missing files */ + /* If it is missing and there are no actions to create it, boom. */ + /* If we can not make a target we do not care about it, okay. */ + /* We could insist that there are updating actions for all missing */ + /* files, but if they have dependencies we just pretend it is a NOTFILE. */ + + if ( ( fate == T_FATE_MISSING ) && !t->actions && !t->depends ) + { + if ( t->flags & T_FLAG_NOCARE ) + { +#ifdef OPT_GRAPH_DEBUG_EXT + if ( DEBUG_FATE ) + printf( "fate change %s to STABLE from %s, " + "no actions, no dependencies and do not care\n", + t->name, target_fate[ fate ] ); +#endif + fate = T_FATE_STABLE; + } + else + { + printf( "don't know how to make %s\n", t->name ); + fate = T_FATE_CANTFIND; + } + } + + /* Step 4f: propagate dependencies' time & fate. */ + /* Set leaf time to be our time only if this is a leaf. */ + + t->time = max( t->time, last ); + t->leaf = leaf ? leaf : t->time ; + /* This target's fate may have been updated by virtue of following some + * target's rebuilds list, so only allow it to be increased to the fate we + * have calculated. Otherwise, grab its new fate. + */ + if ( fate > t->fate ) + t->fate = fate; + else + fate = t->fate; + + /* Step 4g: if this target needs to be built, force rebuild everything in + * this target's rebuilds list. + */ + if ( ( fate >= T_FATE_BUILD ) && ( fate < T_FATE_BROKEN ) ) + force_rebuilds( t ); + + /* + * Step 5: sort dependencies by their update time. + */ + + if ( globs.newestfirst ) + t->depends = make0sort( t->depends ); + + /* + * Step 6: a little harmless tabulating for tracing purposes + */ + + /* Do not count or report interal includes nodes. */ + if ( t->flags & T_FLAG_INTERNAL ) + return; + + if ( counts ) + { +#ifdef OPT_IMPROVED_PATIENCE_EXT + ++counts->targets; +#else + if ( !( ++counts->targets % 1000 ) && DEBUG_MAKE ) + printf( "...patience...\n" ); +#endif + + if ( fate == T_FATE_ISTMP ) + ++counts->temp; + else if ( fate == T_FATE_CANTFIND ) + ++counts->cantfind; + else if ( ( fate == T_FATE_CANTMAKE ) && t->actions ) + ++counts->cantmake; + else if ( ( fate >= T_FATE_BUILD ) && ( fate < T_FATE_BROKEN ) && + t->actions ) + ++counts->updating; + } + + if ( !( t->flags & T_FLAG_NOTFILE ) && ( fate >= T_FATE_SPOIL ) ) + flag = "+"; + else if ( ( t->binding == T_BIND_EXISTS ) && p && ( t->time > p->time ) ) + flag = "*"; + + if ( DEBUG_MAKEPROG ) + printf( "made%s\t%s\t%s%s\n", flag, target_fate[ (int) t->fate ], + spaces( depth ), t->name ); +} + + +#ifdef OPT_GRAPH_DEBUG_EXT + +static const char * target_name( TARGET * t ) +{ + static char buf[ 1000 ]; + if ( t->flags & T_FLAG_INTERNAL ) + { + sprintf( buf, "%s (internal node)", t->name ); + return buf; + } + return t->name; +} + + +/* + * dependGraphOutput() - output the DG after make0 has run. + */ + +static void dependGraphOutput( TARGET * t, int depth ) +{ + TARGETS * c; + + if ( ( t->flags & T_FLAG_VISITED ) || !t->name || !t->boundname ) + return; + + t->flags |= T_FLAG_VISITED; + + switch ( t->fate ) + { + case T_FATE_TOUCHED: + case T_FATE_MISSING: + case T_FATE_OUTDATED: + case T_FATE_UPDATE: + printf( "->%s%2d Name: %s\n", spaces( depth ), depth, target_name( t ) ); + break; + default: + printf( " %s%2d Name: %s\n", spaces( depth ), depth, target_name( t ) ); + break; + } + + if ( strcmp( t->name, t->boundname ) ) + printf( " %s Loc: %s\n", spaces( depth ), t->boundname ); + + switch ( t->fate ) + { + case T_FATE_STABLE: + printf( " %s : Stable\n", spaces( depth ) ); + break; + case T_FATE_NEWER: + printf( " %s : Newer\n", spaces( depth ) ); + break; + case T_FATE_ISTMP: + printf( " %s : Up to date temp file\n", spaces( depth ) ); + break; + case T_FATE_NEEDTMP: + printf( " %s : Temporary file, to be updated\n", spaces( depth ) ); + break; + case T_FATE_TOUCHED: + printf( " %s : Been touched, updating it\n", spaces( depth ) ); + break; + case T_FATE_MISSING: + printf( " %s : Missing, creating it\n", spaces( depth ) ); + break; + case T_FATE_OUTDATED: + printf( " %s : Outdated, updating it\n", spaces( depth ) ); + break; + case T_FATE_REBUILD: + printf( " %s : Rebuild, updating it\n", spaces( depth ) ); + break; + case T_FATE_UPDATE: + printf( " %s : Updating it\n", spaces( depth ) ); + break; + case T_FATE_CANTFIND: + printf( " %s : Can not find it\n", spaces( depth ) ); + break; + case T_FATE_CANTMAKE: + printf( " %s : Can make it\n", spaces( depth ) ); + break; + } + + if ( t->flags & ~T_FLAG_VISITED ) + { + printf( " %s : ", spaces( depth ) ); + if ( t->flags & T_FLAG_TEMP ) printf( "TEMPORARY " ); + if ( t->flags & T_FLAG_NOCARE ) printf( "NOCARE " ); + if ( t->flags & T_FLAG_NOTFILE ) printf( "NOTFILE " ); + if ( t->flags & T_FLAG_TOUCHED ) printf( "TOUCHED " ); + if ( t->flags & T_FLAG_LEAVES ) printf( "LEAVES " ); + if ( t->flags & T_FLAG_NOUPDATE ) printf( "NOUPDATE " ); + printf( "\n" ); + } + + for ( c = t->depends; c; c = c->next ) + { + printf( " %s : Depends on %s (%s)", spaces( depth ), + target_name( c->target ), target_fate[ (int) c->target->fate ] ); + if ( c->target->time == t->time ) + printf( " (max time)"); + printf( "\n" ); + } + + for ( c = t->depends; c; c = c->next ) + dependGraphOutput( c->target, depth + 1 ); +} +#endif + + +/* + * make0sort() - reorder TARGETS chain by their time (newest to oldest). + * + * We walk chain, taking each item and inserting it on the sorted result, with + * newest items at the front. This involves updating each of the TARGETS' + * c->next and c->tail. Note that we make c->tail a valid prev pointer for every + * entry. Normally, it is only valid at the head, where prev == tail. Note also + * that while tail is a loop, next ends at the end of the chain. + */ + +static TARGETS * make0sort( TARGETS * chain ) +{ + PROFILE_ENTER( MAKE_MAKE0SORT ); + + TARGETS * result = 0; + + /* Walk the current target list. */ + while ( chain ) + { + TARGETS * c = chain; + TARGETS * s = result; + + chain = chain->next; + + /* Find point s in result for c. */ + while ( s && ( s->target->time > c->target->time ) ) + s = s->next; + + /* Insert c in front of s (might be 0). Do not even think of deciphering + * this. + */ + c->next = s; /* good even if s = 0 */ + if ( result == s ) result = c; /* new head of chain? */ + if ( !s ) s = result; /* wrap to ensure a next */ + if ( result != c ) s->tail->next = c; /* not head? be prev's next */ + c->tail = s->tail; /* take on next's prev */ + s->tail = c; /* make next's prev us */ + } + + PROFILE_EXIT( MAKE_MAKE0SORT ); + return result; +} + + +static LIST * targets_to_update_ = 0; + + +void mark_target_for_updating( char * target ) +{ + targets_to_update_ = list_new( targets_to_update_, target ); +} + + +LIST * targets_to_update() +{ + return targets_to_update_; +} + + +void clear_targets_to_update() +{ + list_free( targets_to_update_ ); + targets_to_update_ = 0; +} |