src/tools/gn/item_node.cc

   1 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "tools/gn/item_node.h"
   6
   7 #include <algorithm>
   8
   9 #include "base/callback.h"
  10 #include "base/logging.h"
  11 #include "tools/gn/build_settings.h"
  12 #include "tools/gn/item.h"
  13
  14 ItemNode::ItemNode(Item* i)
  15     : state_(REFERENCED),
  16       item_(i),
  17       should_generate_(false) {
  18   item_->set_item_node(this);
  19 }
  20
  21 ItemNode::~ItemNode() {
  22 }
  23
  24 bool ItemNode::SetShouldGenerate(const BuildSettings* build_settings,
  25                                  Err* err) {
  26   if (should_generate_)
  27     return true;
  28   should_generate_ = true;
  29
  30   if (state_ == DEFINED) {
  31     if (!ScheduleDepsLoad(build_settings, err))
  32       return false;
  33   } else if (state_ == RESOLVED) {
  34     // The item may have been resolved even if we didn't set the generate bit
  35     // if all of its deps were loaded some other way. In this case, we need
  36     // to run the closure which we skipped when it became resolved.
  37     if (!resolved_closure_.is_null())
  38       resolved_closure_.Run();
  39   }
  40
  41   // Pass the generate bit to all deps.
  42   for (ItemNodeMap::iterator i = direct_dependencies_.begin();
  43        i != direct_dependencies_.end(); ++i) {
  44     if (!i->first->SetShouldGenerate(build_settings, err))
  45       return false;
  46   }
  47   return true;
  48 }
  49
  50 bool ItemNode::AddDependency(const BuildSettings* build_settings,
  51                              const LocationRange& specified_from_here,
  52                              ItemNode* node,
  53                              Err* err) {
  54   // Can't add more deps once it's been defined.
  55   DCHECK(state_ == REFERENCED);
  56
  57   if (direct_dependencies_.find(node) != direct_dependencies_.end())
  58     return true;  // Already have this dep.
  59
  60   direct_dependencies_[node] = specified_from_here;
  61
  62   if (node->state() != RESOLVED) {
  63     // Wire up the pending resolution info.
  64     unresolved_dependencies_[node] = specified_from_here;
  65     node->waiting_on_resolution_[this] = specified_from_here;
  66   }
  67
  68   if (should_generate_) {
  69     if (!node->SetShouldGenerate(build_settings, err))
  70       return false;
  71   }
  72   return true;
  73 }
  74
  75 void ItemNode::MarkDirectDependencyResolved(ItemNode* node) {
  76   DCHECK(unresolved_dependencies_.find(node) != unresolved_dependencies_.end());
  77   unresolved_dependencies_.erase(node);
  78 }
  79
  80 void ItemNode::SwapOutWaitingDependencySet(ItemNodeMap* out_map) {
  81   waiting_on_resolution_.swap(*out_map);
  82   DCHECK(waiting_on_resolution_.empty());
  83 }
  84
  85 bool ItemNode::SetDefined(const BuildSettings* build_settings, Err* err) {
  86   DCHECK(state_ == REFERENCED);
  87   state_ = DEFINED;
  88
  89   if (should_generate_)
  90     return ScheduleDepsLoad(build_settings, err);
  91   return true;
  92 }
  93
  94 void ItemNode::SetResolved() {
  95   DCHECK(state_ != RESOLVED);
  96   state_ = RESOLVED;
  97
  98   if (should_generate_ && !resolved_closure_.is_null())
  99     resolved_closure_.Run();
 100 }
 101
 102 bool ItemNode::ScheduleDepsLoad(const BuildSettings* build_settings,
 103                                 Err* err) {
 104   DCHECK(state_ == DEFINED);
 105   DCHECK(should_generate_);  // Shouldn't be requesting deps for ungenerated
 106                              // items.
 107
 108   for (ItemNodeMap::const_iterator i = unresolved_dependencies_.begin();
 109        i != unresolved_dependencies_.end(); ++i) {
 110     Label toolchain_label = i->first->item()->label().GetToolchainLabel();
 111     SourceDir dir_to_load = i->first->item()->label().dir();
 112
 113     if (!build_settings->toolchain_manager().ScheduleInvocationLocked(
 114             i->second, toolchain_label, dir_to_load, err))
 115       return false;
 116   }
 117
 118   state_ = PENDING_DEPS;
 119   return true;
 120 }