source/target.cpp

   1 /* $Id$
   2
   3 This file is part of builder
   4 Copyright © 2006-2009  Mikko Rasa, Mikkosoft Productions
   5 Distributed under the LGPL
   6 */
   7
   8 #include <msp/fs/stat.h>
   9 #include <msp/fs/utils.h>
  10 #include <msp/time/utils.h>
  11 #include "action.h"
  12 #include "builder.h"
  13 #include "filetarget.h"
  14 #include "package.h"
  15 #include "sourcepackage.h"
  16 #include "target.h"
  17
  18 using namespace std;
  19 using namespace Msp;
  20
  21 Target::Target(Builder &b, const Package *p, const string &n):
  22         builder(b),
  23         package(p),
  24         name(n),
  25         buildable(false),
  26         building(false),
  27         rebuild(false),
  28         deps_ready(false),
  29         preparing(false),
  30         prepared(false)
  31 { }
  32
  33 Target *Target::get_buildable_target()
  34 {
  35         if(!rebuild)
  36                 return 0;
  37
  38         bool self_ok = !building;
  39         for(TargetList::iterator i=depends.begin(); i!=depends.end(); ++i)
  40         {
  41                 Target *tgt = (*i)->get_buildable_target();
  42                 if(tgt)
  43                         return tgt;
  44                 else if((*i)->get_rebuild())
  45                         self_ok = false;
  46         }
  47
  48         if(self_ok)
  49                 return this;
  50
  51         return 0;
  52 }
  53
  54 void Target::add_depend(Target *dep)
  55 {
  56         if(dep==this)
  57                 throw InvalidParameterValue("A target can't depend on itself");
  58         depends.push_back(dep);
  59         dep->rdepends.push_back(this);
  60 }
  61
  62 void Target::prepare()
  63 {
  64         if(prepared)
  65                 return;
  66         if(preparing)
  67         {
  68                 builder.problem((package ? package->get_name() : string()), "Dependency cycle detected at "+name);
  69                 return;
  70         }
  71
  72         preparing = true;
  73         for(TargetList::iterator i=depends.begin(); i!=depends.end(); ++i)
  74                 (*i)->prepare();
  75
  76         check_rebuild();
  77         preparing = false;
  78         prepared = true;
  79 }
  80
  81 Action *Target::build()
  82 {
  83         if(!buildable)
  84         {
  85                 rebuild = false;
  86                 return 0;
  87         }
  88
  89         if(FileTarget *ft = dynamic_cast<FileTarget *>(this))
  90                 if(!builder.get_dry_run() && FS::exists(ft->get_path()))
  91                         FS::unlink(ft->get_path());
  92
  93         Action *action = create_action();
  94         if(action)
  95         {
  96                 action->signal_done.connect(sigc::mem_fun(this, &Target::build_done));
  97
  98                 building = true;
  99         }
 100
 101         return action;
 102 }
 103
 104 void Target::touch()
 105 {
 106         mtime = Time::now();
 107 }
 108
 109 void Target::mark_rebuild(const std::string &reason)
 110 {
 111         rebuild = true;
 112         rebuild_reason = reason;
 113 }
 114
 115 void Target::check_rebuild()
 116 {
 117         if(!buildable)
 118                 return;
 119
 120         if(builder.get_build_all())
 121                 mark_rebuild("Rebuilding everything");
 122         else if(!mtime)
 123                 mark_rebuild("Does not exist");
 124         else
 125         {
 126                 for(TargetList::iterator i=depends.begin(); (i!=depends.end() && !rebuild); ++i)
 127                 {
 128                         if((*i)->get_mtime()>mtime)
 129                                 mark_rebuild((*i)->get_name()+" has changed");
 130                         else if((*i)->get_rebuild())
 131                                 mark_rebuild((*i)->get_name()+" needs rebuilding");
 132                 }
 133         }
 134
 135         const SourcePackage *spkg = dynamic_cast<const SourcePackage *>(package);
 136         if(!rebuild && spkg && spkg->get_config().get_mtime()>mtime)
 137                 mark_rebuild("Package options changed");
 138 }
 139
 140 void Target::build_done()
 141 {
 142         building = false;
 143         rebuild = false;
 144 }