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 Action *Target::build()
  72 {
  73         if(!buildable)
  74         {
  75                 rebuild=false;
  76                 return 0;
  77         }
  78
  79         if(!builder.get_dry_run() && exists(name))
  80                 unlink(name);
  81
  82         Action *action=create_action();
  83         if(action)
  84         {
  85                 action->signal_done.connect(sigc::mem_fun(this, &Target::build_done));
  86
  87                 building=true;
  88         }
  89
  90         return action;
  91 }
  92
  93 /**
  94 Returns the number of targets that need to be rebuilt in order to get this
  95 target up-to-date.
  96 */
  97 unsigned Target::count_rebuild()
  98 {
  99         if(counted)
 100                 return 0;
 101
 102         counted=true;
 103         unsigned count=rebuild;
 104         for(TargetList::iterator i=depends.begin(); i!=depends.end(); ++i)
 105                 count+=(*i)->count_rebuild();
 106         return count;
 107 }
 108
 109 /**
 110 Changes the mtime of the target to the current time.
 111 */
 112 void Target::touch()
 113 {
 114         mtime=Time::now();
 115 }
 116
 117 Target::Target(Builder &b, const Package *p, const string &n):
 118         builder(b),
 119         package(p),
 120         name(n),
 121         buildable(false),
 122         building(false),
 123         rebuild(false),
 124         deps_ready(false),
 125         prepared(false),
 126         counted(false)
 127 {
 128         builder.add_target(this);
 129
 130         struct stat st;
 131         if(!stat(name, st))
 132                 mtime=Time::TimeStamp::from_unixtime(st.st_mtime);
 133 }
 134
 135 void Target::mark_rebuild(const std::string &reason)
 136 {
 137         rebuild=true;
 138         rebuild_reason=reason;
 139 }
 140
 141 /**
 142 Checks if this target needs to be rebuilt and why.
 143 */
 144 void Target::check_rebuild()
 145 {
 146         if(!buildable)
 147                 return;
 148
 149         if(builder.get_build_all())
 150                 mark_rebuild("Rebuilding everything");
 151         else if(!mtime)
 152                 mark_rebuild("Does not exist");
 153         else
 154         {
 155                 for(TargetList::iterator i=depends.begin(); (i!=depends.end() && !rebuild); ++i)
 156                 {
 157                         if((*i)->get_mtime()>mtime)
 158                                 mark_rebuild(basename((*i)->get_name())+" has changed");
 159                         else if((*i)->get_rebuild())
 160                                 mark_rebuild(basename((*i)->get_name())+" needs rebuilding");
 161                 }
 162         }
 163
 164         const SourcePackage *spkg=dynamic_cast<const SourcePackage *>(package);
 165         if(!rebuild && spkg && spkg->get_config().get_mtime()>mtime)
 166                 mark_rebuild("Package options changed");
 167 }
 168
 169 /**
 170 Handles for the build_done signal of Action.
 171 */
 172 void Target::build_done()
 173 {
 174         building=false;
 175         rebuild=false;
 176 }