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rules.c
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rules.c
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/*
* Copyright 1993, 1995 Christopher Seiwald.
*
* This file is part of Jam - see jam.c for Copyright information.
*/
/*
* rules.c - access to RULEs, TARGETs, and ACTIONs
*
* External routines:
*
* bindrule() - return pointer to RULE, creating it if necessary
* bindtarget() - return pointer to TARGET, creating it if necessary
* copytarget() - make a new target with the old target's name
* touchtarget() - mark a target to simulate being new
* targetlist() - turn list of target names into a TARGET chain
* targetentry() - add a TARGET to a chain of TARGETS
* targetchain() - append two TARGET chains
* actionlist() - append to an ACTION chain
* addsettings() - add a deferred "set" command to a target
* copysettings() - copy a settings list for temp use
* pushsettings() - set all target specific variables
* popsettings() - reset target specific variables to their pre-push values
* freesettings() - delete a settings list
* donerules() - free RULE and TARGET tables
*
* 04/12/94 (seiwald) - actionlist() now just appends a single action.
* 08/23/94 (seiwald) - Support for '+=' (append to variable)
* 06/21/02 (seiwald) - support for named parameters
* 11/04/02 (seiwald) - const-ing for string literals
* 12/03/02 (seiwald) - fix odd includes support by grafting them onto depends
* 12/17/02 (seiwald) - new copysettings() to protect target-specific vars
* 01/14/03 (seiwald) - fix includes fix with new internal includes TARGET
*/
# include "jam.h"
# include "lists.h"
# include "parse.h"
# include "variable.h"
# include "rules.h"
# include "newstr.h"
# include "hash.h"
static struct hash *rulehash = 0;
static struct hash *targethash = 0;
# ifdef OPT_RULE_PROFILING_EXT
static RULE *profiling_rule_list = 0;
# endif
/*
* bindrule() - return pointer to RULE, creating it if necessary
*/
RULE *
bindrule( const char *rulename )
{
RULE rule, *r = &rule;
if( !rulehash )
rulehash = hashinit( sizeof( RULE ), "rules" );
r->name = rulename;
if( hashenter( rulehash, (HASHDATA **)&r ) )
{
r->name = newstr( rulename ); /* never freed */
r->procedure = (PARSE *)0;
r->actions = (char *)0;
r->bindlist = L0;
r->params = L0;
r->flags = 0;
# ifdef OPT_RULE_PROFILING_EXT
if ( DEBUG_PROFILE_RULES )
{
r->invocations = 0;
r->invocation_time = 0;
r->next_profiling_rule = profiling_rule_list;
profiling_rule_list = r;
}
# endif
}
return r;
}
/*
* bindtarget() - return pointer to TARGET, creating it if necessary
*/
TARGET *
bindtarget( const char *targetname )
{
TARGET target, *t = ⌖
if( !targethash )
targethash = hashinit( sizeof( TARGET ), "targets" );
t->name = targetname;
if( hashenter( targethash, (HASHDATA **)&t ) )
{
memset( (char *)t, '\0', sizeof( *t ) );
t->name = newstr( targetname ); /* never freed */
t->boundname = t->name; /* default for T_FLAG_NOTFILE */
}
return t;
}
/*
* copytarget() - make a new target with the old target's name
*
* Not entered into hash table -- for internal nodes.
*/
TARGET *
copytarget( const TARGET *ot )
{
TARGET *t;
t = (TARGET *)malloc( sizeof( *t ) );
memset( (char *)t, '\0', sizeof( *t ) );
t->name = copystr( ot->name );
t->boundname = t->name;
t->flags |= T_FLAG_NOTFILE | T_FLAG_INTERNAL;
return t;
}
/*
* touchtarget() - mark a target to simulate being new
*/
void
touchtarget( const char *t )
{
bindtarget( t )->flags |= T_FLAG_TOUCHED;
}
/*
* targetlist() - turn list of target names into a TARGET chain
*
* Inputs:
* chain existing TARGETS to append to
* targets list of target names
*/
TARGETS *
targetlist(
TARGETS *chain,
LIST *targets )
{
for( ; targets; targets = list_next( targets ) )
chain = targetentry( chain, bindtarget( targets->string ) );
return chain;
}
/*
* targetentry() - add a TARGET to a chain of TARGETS
*
* Inputs:
* chain exisitng TARGETS to append to
* target new target to append
*/
TARGETS *
targetentry(
TARGETS *chain,
TARGET *target )
{
TARGETS *c;
c = (TARGETS *)malloc( sizeof( TARGETS ) );
c->target = target;
if( !chain ) chain = c;
else chain->tail->next = c;
chain->tail = c;
c->next = 0;
return chain;
}
/*
* targetchain() - append two TARGET chains
*
* Inputs:
* chain exisitng TARGETS to append to
* target new target to append
*/
TARGETS *
targetchain(
TARGETS *chain,
TARGETS *targets )
{
TARGETS *c;
if( !targets )
return chain;
else if( !chain )
return targets;
chain->tail->next = targets;
chain->tail = targets->tail;
return chain;
}
/*
* actionlist() - append to an ACTION chain
*/
ACTIONS *
actionlist(
ACTIONS *chain,
ACTION *action )
{
ACTIONS *actions = (ACTIONS *)malloc( sizeof( ACTIONS ) );
actions->action = action;
if( !chain ) chain = actions;
else chain->tail->next = actions;
chain->tail = actions;
actions->next = 0;
return chain;
}
/*
* addsettings() - add a deferred "set" command to a target
*
* Adds a variable setting (varname=list) onto a chain of settings
* for a particular target. Replaces the previous previous value,
* if any, unless 'append' says to append the new list onto the old.
* Returns the head of the chain of settings.
*/
SETTINGS *
addsettings(
SETTINGS *head,
int setflag,
const char *symbol,
LIST *value )
{
SETTINGS *v;
/* Look for previous setting */
for( v = head; v; v = v->next )
if( !strcmp( v->symbol, symbol ) )
break;
/* If not previously set, alloc a new. */
/* If appending, do so. */
/* Else free old and set new. */
if( !v )
{
v = (SETTINGS *)malloc( sizeof( *v ) );
v->symbol = newstr( symbol );
v->value = value;
v->next = head;
head = v;
}
else switch( setflag )
{
case VAR_SET:
/* Toss old, set new */
list_free( v->value );
v->value = value;
break;
case VAR_APPEND:
/* Append new to old */
v->value = list_append( v->value, value );
break;
case VAR_DEFAULT:
/* Toss new, old already set */
list_free( value );
break;
}
/* Return (new) head of list. */
return head;
}
/*
* copysettings() - copy a settings list for temp use
*
* When target-specific variables are pushed into place with pushsettings(),
* any global variables with the same name are swapped onto the target's
* SETTINGS chain. If that chain gets modified (by using the "on target"
* syntax), popsettings() would wrongly swap those modified values back
* as the new global values.
*
* copysettings() protects the target's SETTINGS chain by providing a
* copy of the chain to pass to pushsettings() and popsettings(), so that
* the target's original SETTINGS chain can be modified using the usual
* "on target" syntax.
*/
SETTINGS *
copysettings( SETTINGS *from )
{
SETTINGS *head = 0, *v;
for( ; from; from = from->next )
{
SETTINGS *v = (SETTINGS *)malloc( sizeof( *v ) );
v->symbol = copystr( from->symbol );
v->value = list_copy( 0, from->value );
v->next = head;
head = v;
}
return head;
}
/*
* pushsettings() - set all target specific variables
*/
void
pushsettings( SETTINGS *v )
{
for( ; v; v = v->next )
v->value = var_swap( v->symbol, v->value );
}
/*
* popsettings() - reset target specific variables to their pre-push values
*/
void
popsettings( SETTINGS *v )
{
pushsettings( v ); /* just swap again */
}
/*
* freesettings() - delete a settings list
*/
void
freesettings( SETTINGS *v )
{
while( v )
{
SETTINGS *n = v->next;
freestr( v->symbol );
list_free( v->value );
free( (char *)v );
v = n;
}
}
/*
* donerules() - free RULE and TARGET tables
*/
void
donerules()
{
# ifdef OPT_RULE_PROFILING_EXT
if ( DEBUG_PROFILE_RULES )
{
RULE *rule;
printf("# invoked total time (us) rule\n");
printf("--------- --------------- "
"------------------------------------\n");
for (rule = profiling_rule_list;
rule;
rule = rule->next_profiling_rule)
{
printf("%9d %15lld %s\n", rule->invocations,
(long long)rule->invocation_time, rule->name);
}
}
# endif
hashdone( rulehash );
hashdone( targethash );
}