source/target.cpp

   1 /* $Id$
   2
   3 This file is part of builder
   4 Copyright © 2006-2007 Mikko Rasa, Mikkosoft Productions
   5 Distributed under the LGPL
   6 */
   7
   8 #include <msp/path/utils.h>
   9 #include <msp/time/utils.h>
  10 #include "action.h"
  11 #include "builder.h"
  12 #include "package.h"
  13 #include "sourcepackage.h"
  14 #include "target.h"
  15
  16 using namespace std;
  17 using namespace Msp;
  18
  19 /**
  20 Tries to locate a target that will help getting this target built.  If all
  21 dependencies are up-to-date, returns this target.  If there are no targets
  22 ready to be built (maybe because they are being built right now), returns 0.
  23 */
  24 Target *Target::get_buildable_target()
  25 {
  26         if(!rebuild)
  27                 return 0;
  28
  29         bool self_ok=!building;
  30         for(TargetList::iterator i=depends.begin(); i!=depends.end(); ++i)
  31         {
  32                 Target *tgt=(*i)->get_buildable_target();
  33                 if(tgt)
  34                         return tgt;
  35                 else if((*i)->get_rebuild())
  36                         self_ok=false;
  37         }
  38
  39         if(self_ok)
  40                 return this;
  41
  42         return 0;
  43 }
  44
  45 void Target::add_depend(Target *dep)
  46 {
  47         if(dep==this)
  48                 throw InvalidParameterValue("A target can't depend on itself");
  49         depends.push_back(dep);
  50         dep->rdepends.push_back(this);
  51 }
  52
  53 /**
  54 Prepares the target by recursively preparing dependencies, then checking
  55 whether rebuilding is needed.  A flag is used to prevent unnecessary
  56 executions.
  57 */
  58 void Target::prepare()
  59 {
  60         if(prepared)
  61                 return;
  62
  63         prepared=true;
  64         for(TargetList::iterator i=depends.begin(); i!=depends.end(); ++i)
  65                 (*i)->prepare();
  66
  67         check_rebuild();
  68
  69 }
  70
  71 /**
  72 Returns the number of targets that need to be rebuilt in order to get this
  73 target up-to-date.
  74 */
  75 unsigned Target::count_rebuild()
  76 {
  77         if(counted)
  78                 return 0;
  79
  80         counted=true;
  81         unsigned count=rebuild;
  82         for(TargetList::iterator i=depends.begin(); i!=depends.end(); ++i)
  83                 count+=(*i)->count_rebuild();
  84         return count;
  85 }
  86
  87 /**
  88 Changes the mtime of the target to the current time.
  89 */
  90 void Target::touch()
  91 {
  92         mtime=Time::now();
  93 }
  94
  95 Target::Target(Builder &b, const Package *p, const string &n):
  96         builder(b),
  97         package(p),
  98         name(n),
  99         buildable(false),
 100         building(false),
 101         rebuild(false),
 102         deps_ready(false),
 103         prepared(false),
 104         counted(false)
 105 {
 106         builder.add_target(this);
 107
 108         struct stat st;
 109         if(!stat(name, st))
 110                 mtime=Time::TimeStamp::from_unixtime(st.st_mtime);
 111 }
 112
 113 void Target::mark_rebuild(const std::string &reason)
 114 {
 115         rebuild=true;
 116         rebuild_reason=reason;
 117 }
 118
 119 /**
 120 Checks if this target needs to be rebuilt and why.
 121 */
 122 void Target::check_rebuild()
 123 {
 124         if(!buildable)
 125                 return;
 126
 127         if(builder.get_build_all())
 128                 mark_rebuild("Rebuilding everything");
 129         else if(!mtime)
 130                 mark_rebuild("Does not exist");
 131         else
 132         {
 133                 for(TargetList::iterator i=depends.begin(); (i!=depends.end() && !rebuild); ++i)
 134                 {
 135                         if((*i)->get_mtime()>mtime)
 136                                 mark_rebuild(basename((*i)->get_name())+" has changed");
 137                         else if((*i)->get_rebuild())
 138                                 mark_rebuild(basename((*i)->get_name())+" needs rebuilding");
 139                 }
 140         }
 141
 142         const SourcePackage *spkg=dynamic_cast<const SourcePackage *>(package);
 143         if(!rebuild && spkg && spkg->get_config().get_mtime()>mtime)
 144                 mark_rebuild("Package options changed");
 145 }
 146
 147 /**
 148 Hooks the target up with the given action, then returns it.  This should be
 149 called from the public build() function of buildable targets.
 150 */
 151 Action *Target::build(Action *action)
 152 {
 153         building=true;
 154         action->signal_done.connect(sigc::mem_fun(this, &Target::build_done));
 155         return action;
 156 }
 157
 158 /**
 159 Handles for the build_done signal of Action.
 160 */
 161 void Target::build_done()
 162 {
 163         building=false;
 164         rebuild=false;
 165 }