| // Copyright (c) 2013 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "tools/gn/config.h" |
| |
| #include "tools/gn/err.h" |
| #include "tools/gn/input_file_manager.h" |
| #include "tools/gn/item_node.h" |
| #include "tools/gn/item_tree.h" |
| #include "tools/gn/scheduler.h" |
| |
| Config::Config(const Label& label) : Item(label) { |
| } |
| |
| Config::~Config() { |
| } |
| |
| Config* Config::AsConfig() { |
| return this; |
| } |
| |
| const Config* Config::AsConfig() const { |
| return this; |
| } |
| |
| // static |
| Config* Config::GetConfig(const Settings* settings, |
| const LocationRange& specified_from_here, |
| const Label& label, |
| Item* dep_from, |
| Err* err) { |
| DCHECK(!label.is_null()); |
| |
| ItemTree* tree = &settings->build_settings()->item_tree(); |
| base::AutoLock lock(tree->lock()); |
| |
| ItemNode* node = tree->GetExistingNodeLocked(label); |
| Config* config = NULL; |
| if (!node) { |
| config = new Config(label); |
| node = new ItemNode(config); |
| tree->AddNodeLocked(node); |
| |
| // Only schedule loading the given target if somebody is depending on it |
| // (and we optimize by not re-asking it to run the current file). |
| // Otherwise, we're probably generating it right now. |
| if (dep_from && dep_from->label().dir() != label.dir()) { |
| settings->build_settings()->toolchain_manager().ScheduleInvocationLocked( |
| specified_from_here, label.GetToolchainLabel(), label.dir(), |
| err); |
| } |
| } else if ((config = node->item()->AsConfig())) { |
| // Previously saw this item as a config. |
| |
| // If we have no dep_from, we're generating it. In this case, it had better |
| // not already be generated. |
| if (!dep_from && node->state() != ItemNode::REFERENCED) { |
| *err = Err(specified_from_here, "Duplicate config definition.", |
| "You already told me about a config with this name."); |
| return NULL; |
| } |
| } else { |
| // Previously saw this thing as a non-config. |
| *err = Err(specified_from_here, |
| "Config name already used.", |
| "Previously you specified a " + |
| node->item()->GetItemTypeName() + " with this name instead."); |
| return NULL; |
| } |
| |
| // Keep a record of the guy asking us for this dependency. We know if |
| // somebody is adding a dependency, that guy it himself not resolved. |
| if (dep_from && node->state() != ItemNode::RESOLVED) |
| tree->GetExistingNodeLocked(dep_from->label())->AddDependency(node); |
| |
| return config; |
| } |