source/target.cpp

   1 #include <algorithm>
   2 #include <msp/fs/stat.h>
   3 #include <msp/fs/utils.h>
   4 #include <msp/strings/format.h>
   5 #include "builder.h"
   6 #include "filetarget.h"
   7 #include "sourcepackage.h"
   8 #include "target.h"
   9 #include "task.h"
  10 #include "tool.h"
  11
  12 using namespace std;
  13 using namespace Msp;
  14
  15 Target::Target(Builder &b, const string &n):
  16         builder(b),
  17         package(0),
  18         component(0),
  19         name(n),
  20         tool(0),
  21         state(INIT),
  22         primary_target(0)
  23 {
  24         builder.get_build_graph().add_target(this);
  25 }
  26
  27 void Target::add_dependency(Target &dep)
  28 {
  29         if(&dep==this)
  30                 throw invalid_argument("Target::add_depend");
  31         depends.push_back(&dep);
  32         if(state>PREPARING)
  33                 dep.signal_bubble_rebuild.connect(sigc::mem_fun(this, &Target::check_rebuild));
  34 }
  35
  36 void Target::add_side_effect(Target &se)
  37 {
  38         side_effects.push_back(&se);
  39         if(tool)
  40                 se.set_tool(*tool);
  41         se.primary_target = this;
  42         /* Side effects are checked for rebuild after the primary target.  Recheck
  43         the primary if a side effect is marked for rebuild. */
  44         se.signal_bubble_rebuild.connect(sigc::mem_fun(this, &Target::check_rebuild));
  45 }
  46
  47 Target *Target::get_buildable_target()
  48 {
  49         if(primary_target)
  50                 return primary_target->get_buildable_target();
  51         if(!needs_rebuild())
  52                 return 0;
  53
  54         bool self_ok = state!=BUILDING;
  55         for(Dependencies::iterator i=depends.begin(); i!=depends.end(); ++i)
  56         {
  57                 // Avoid infinite recursion if a target repends on its own side effect
  58                 if(find(side_effects.begin(), side_effects.end(), *i)!=side_effects.end())
  59                         continue;
  60
  61                 Target *tgt = (*i)->get_buildable_target();
  62                 if(tgt)
  63                         return tgt;
  64                 else if((*i)->needs_rebuild())
  65                         self_ok = false;
  66         }
  67
  68         if(self_ok)
  69                 return this;
  70
  71         return 0;
  72 }
  73
  74 void Target::set_tool(Tool &t)
  75 {
  76         tool = &t;
  77         for(Dependencies::const_iterator i=side_effects.begin(); i!=side_effects.end(); ++i)
  78                 (*i)->set_tool(t);
  79 }
  80
  81 void Target::force_rebuild()
  82 {
  83         if(!is_buildable())
  84                 throw logic_error("Target::force_rebuild");
  85         mark_rebuild("Forced rebuild");
  86 }
  87
  88 void Target::mark_rebuild(const string &reason)
  89 {
  90         if(reason.empty())
  91                 throw invalid_argument("No reason given for rebuilding "+name);
  92
  93         state = REBUILD;
  94         rebuild_reason = reason;
  95
  96         builder.get_logger().log("rebuild", format("Rebuilding %s: %s", name, reason));
  97
  98         signal_bubble_rebuild.emit();
  99 }
 100
 101 void Target::prepare()
 102 {
 103         if(state>PREPARING)
 104                 return;
 105         if(state==PREPARING)
 106         {
 107                 problems.push_back("Dependency cycle detected");
 108                 state = BROKEN;
 109                 return;
 110         }
 111
 112         state = PREPARING;
 113         if(tool)
 114                 tool->prepare();
 115
 116         find_dependencies();
 117         bool broken = !problems.empty();
 118
 119         if(tool)
 120         {
 121                 if(FileTarget *tool_exe = tool->get_executable())
 122                         add_dependency(*tool_exe);
 123                 broken |= !tool->get_problems().empty();
 124
 125                 // Only check package and component problems for buildable targets
 126                 // XXX How to propagate nested package problems?
 127                 broken |= (package && !package->get_problems().empty());
 128                 broken |= (component && !component->get_problems().empty());
 129         }
 130
 131         for(Dependencies::iterator i=depends.begin(); i!=depends.end(); ++i)
 132         {
 133                 (*i)->prepare();
 134                 broken |= (*i)->is_broken();
 135         }
 136
 137         check_rebuild();
 138         if(broken)
 139                 state = BROKEN;
 140         else if(state==PREPARING)
 141                 state = UPTODATE;
 142
 143         for(Dependencies::iterator i=depends.begin(); i!=depends.end(); ++i)
 144                 (*i)->signal_bubble_rebuild.connect(sigc::mem_fun(this, &Target::check_rebuild));
 145 }
 146
 147 Task *Target::build()
 148 {
 149         if(primary_target)
 150                 return primary_target->build();
 151
 152         Task *task = tool->run(*this);
 153         task->signal_finished.connect(sigc::mem_fun(this, &Target::build_finished));
 154         state = BUILDING;
 155
 156         build(*task);
 157         for(Dependencies::const_iterator i=side_effects.begin(); i!=side_effects.end(); ++i)
 158                 (*i)->build(*task);
 159
 160         return task;
 161 }
 162
 163 void Target::build_finished(bool success)
 164 {
 165         state = UPTODATE;
 166         if(success)
 167         {
 168                 modified();
 169                 for(Dependencies::const_iterator i=side_effects.begin(); i!=side_effects.end(); ++i)
 170                         (*i)->build_finished(success);
 171         }
 172 }