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         builder.add_target(this);
  33 }
  34
  35 Target *Target::get_buildable_target()
  36 {
  37         if(!rebuild)
  38                 return 0;
  39
  40         bool self_ok = !building;
  41         for(TargetList::iterator i=depends.begin(); i!=depends.end(); ++i)
  42         {
  43                 Target *tgt = (*i)->get_buildable_target();
  44                 if(tgt)
  45                         return tgt;
  46                 else if((*i)->get_rebuild())
  47                         self_ok = false;
  48         }
  49
  50         if(self_ok)
  51                 return this;
  52
  53         return 0;
  54 }
  55
  56 void Target::add_depend(Target *dep)
  57 {
  58         if(dep==this)
  59                 throw InvalidParameterValue("A target can't depend on itself");
  60         depends.push_back(dep);
  61         dep->rdepends.push_back(this);
  62 }
  63
  64 void Target::prepare()
  65 {
  66         if(prepared)
  67                 return;
  68         if(preparing)
  69         {
  70                 builder.problem((package ? package->get_name() : string()), "Dependency cycle detected at "+name);
  71                 return;
  72         }
  73
  74         preparing = true;
  75         for(TargetList::iterator i=depends.begin(); i!=depends.end(); ++i)
  76                 (*i)->prepare();
  77
  78         check_rebuild();
  79         preparing = false;
  80         prepared = true;
  81 }
  82
  83 Action *Target::build()
  84 {
  85         if(!buildable)
  86         {
  87                 rebuild = false;
  88                 return 0;
  89         }
  90
  91         if(FileTarget *ft = dynamic_cast<FileTarget *>(this))
  92                 if(!builder.get_dry_run() && FS::exists(ft->get_path()))
  93                         FS::unlink(ft->get_path());
  94
  95         Action *action = create_action();
  96         if(action)
  97         {
  98                 action->signal_done.connect(sigc::mem_fun(this, &Target::build_done));
  99
 100                 building = true;
 101         }
 102
 103         return action;
 104 }
 105
 106 void Target::touch()
 107 {
 108         mtime = Time::now();
 109 }
 110
 111 void Target::mark_rebuild(const std::string &reason)
 112 {
 113         rebuild = true;
 114         rebuild_reason = reason;
 115 }
 116
 117 void Target::check_rebuild()
 118 {
 119         if(!buildable)
 120                 return;
 121
 122         if(builder.get_build_all())
 123                 mark_rebuild("Rebuilding everything");
 124         else if(!mtime)
 125                 mark_rebuild("Does not exist");
 126         else
 127         {
 128                 for(TargetList::iterator i=depends.begin(); (i!=depends.end() && !rebuild); ++i)
 129                 {
 130                         if((*i)->get_mtime()>mtime)
 131                                 mark_rebuild(FS::basename((*i)->get_name())+" has changed");
 132                         else if((*i)->get_rebuild())
 133                                 mark_rebuild(FS::basename((*i)->get_name())+" needs rebuilding");
 134                 }
 135         }
 136
 137         const SourcePackage *spkg = dynamic_cast<const SourcePackage *>(package);
 138         if(!rebuild && spkg && spkg->get_config().get_mtime()>mtime)
 139                 mark_rebuild("Package options changed");
 140 }
 141
 142 void Target::build_done()
 143 {
 144         building = false;
 145         rebuild = false;
 146 }