source/lib/target.cpp

   1 #include <msp/core/algorithm.h>
   2 #include <msp/fs/stat.h>
   3 #include <msp/fs/utils.h>
   4 #include "builder.h"
   5 #include "filetarget.h"
   6 #include "sourcepackage.h"
   7 #include "target.h"
   8 #include "task.h"
   9 #include "tool.h"
  10
  11 using namespace std;
  12 using namespace Msp;
  13
  14 Target::Target(Builder &b, const string &n):
  15         builder(b),
  16         name(n)
  17 {
  18         builder.get_build_graph().add_target(this);
  19 }
  20
  21 void Target::add_dependency(Target &dep)
  22 {
  23         if(&dep==this)
  24                 throw invalid_argument("Target::add_depend");
  25         depends.push_back(&dep);
  26         if(state>PREPARING)
  27                 dep.signal_bubble_rebuild.connect(sigc::mem_fun(this, &Target::check_rebuild));
  28 }
  29
  30 void Target::add_transitive_dependency(Target &dep)
  31 {
  32         if(&dep==this)
  33                 throw invalid_argument("Target::add_transitive_dependency");
  34         trans_depends.push_back(&dep);
  35 }
  36
  37 void Target::add_side_effect(Target &se)
  38 {
  39         side_effects.push_back(&se);
  40         if(tool)
  41                 se.set_tool(*tool);
  42         se.primary_target = this;
  43         /* Side effects are checked for rebuild after the primary target.  Recheck
  44         the primary if a side effect is marked for rebuild. */
  45         se.signal_bubble_rebuild.connect(sigc::mem_fun(this, &Target::check_rebuild));
  46 }
  47
  48 Target *Target::get_buildable_target()
  49 {
  50         if(primary_target)
  51                 return primary_target->get_buildable_target();
  52         if(!needs_rebuild())
  53                 return 0;
  54
  55         bool self_ok = state!=BUILDING;
  56         for(Target *d: depends)
  57         {
  58                 // Avoid infinite recursion if a target depends on its own side effect
  59                 if(any_equals(side_effects, d))
  60                         continue;
  61
  62                 Target *tgt = d->get_buildable_target();
  63                 if(tgt)
  64                         return tgt;
  65                 else if(d->needs_rebuild())
  66                         self_ok = false;
  67         }
  68
  69         if(self_ok)
  70                 return this;
  71
  72         return 0;
  73 }
  74
  75 void Target::set_tool(Tool &t)
  76 {
  77         tool = &t;
  78         for(Target *s: side_effects)
  79                 s->set_tool(t);
  80 }
  81
  82 void Target::collect_build_info(BuildInfo &binfo) const
  83 {
  84         if(tool)
  85                 binfo.update_from(tool->get_build_info());
  86         if(component)
  87                 binfo.update_from(component->get_build_info());
  88         else if(package)
  89                 binfo.update_from(package->get_build_info());
  90 }
  91
  92 void Target::force_rebuild()
  93 {
  94         if(!is_buildable())
  95                 throw logic_error("Target::force_rebuild");
  96         mark_rebuild("Forced rebuild");
  97 }
  98
  99 void Target::mark_rebuild(const string &reason)
 100 {
 101         if(reason.empty())
 102                 throw invalid_argument("No reason given for rebuilding "+name);
 103
 104         state = REBUILD;
 105         rebuild_reason = reason;
 106
 107         builder.get_logger().log("rebuild", "Rebuilding %s: %s", name, reason);
 108
 109         signal_bubble_rebuild.emit();
 110 }
 111
 112 void Target::prepare()
 113 {
 114         if(primary_target && primary_target->state<PREPARING)
 115                 primary_target->prepare();
 116
 117         if(state>PREPARING)
 118                 return;
 119         if(state==PREPARING)
 120         {
 121                 builder.get_logger().log("problems", "Dependency cycle detected at %s", name);
 122                 problems.push_back("Dependency cycle detected");
 123                 state = BROKEN;
 124                 return;
 125         }
 126
 127         state = PREPARING;
 128         /* Prepare existing dependencies early, because their information may be
 129         needed to find other dependencies. */
 130         for(Target *d: depends)
 131                 d->prepare();
 132         if(tool)
 133                 tool->prepare();
 134
 135         find_dependencies();
 136         bool broken = !problems.empty();
 137
 138         if(tool)
 139         {
 140                 if(FileTarget *tool_exe = tool->get_executable())
 141                         add_dependency(*tool_exe);
 142                 broken |= tool->is_broken();
 143
 144                 // Only check package and component brokenness for buildable targets
 145                 broken |= (package && package->is_broken());
 146                 broken |= (component && component->is_broken());
 147         }
 148
 149         /* Now that all dependencies are known, prepare them again.  This will do
 150         nothing to already prepared targets. */
 151         for(Target *d: depends)
 152         {
 153                 d->prepare();
 154                 broken |= d->is_broken();
 155         }
 156         for(Target *d: trans_depends)
 157                 d->prepare();
 158
 159         check_rebuild();
 160         if(broken)
 161                 state = BROKEN;
 162         else if(state==PREPARING)
 163                 state = UPTODATE;
 164
 165         for(Target *d: depends)
 166                 d->signal_bubble_rebuild.connect(sigc::mem_fun(this, &Target::check_rebuild));
 167 }
 168
 169 Task *Target::build()
 170 {
 171         if(primary_target)
 172                 return primary_target->build();
 173
 174         Task *task = tool->run(*this);
 175         task->signal_finished.connect(sigc::mem_fun(this, &Target::build_finished));
 176         state = BUILDING;
 177
 178         build(*task);
 179         for(Target *s: side_effects)
 180                 s->build(*task);
 181
 182         return task;
 183 }
 184
 185 void Target::build_finished(bool success)
 186 {
 187         state = UPTODATE;
 188         if(success)
 189         {
 190                 modified();
 191                 for(Target *s: side_effects)
 192                         s->build_finished(success);
 193                 signal_modified.emit();
 194         }
 195 }