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| 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/config.h" |
| 6 |
| 7 #include "tools/gn/err.h" |
| 8 #include "tools/gn/input_file_manager.h" |
| 9 #include "tools/gn/item_node.h" |
| 10 #include "tools/gn/item_tree.h" |
| 11 #include "tools/gn/scheduler.h" |
| 12 |
| 13 Config::Config(const Label& label) : Item(label) { |
| 14 } |
| 15 |
| 16 Config::~Config() { |
| 17 } |
| 18 |
| 19 Config* Config::AsConfig() { |
| 20 return this; |
| 21 } |
| 22 |
| 23 const Config* Config::AsConfig() const { |
| 24 return this; |
| 25 } |
| 26 |
| 27 // static |
| 28 Config* Config::GetConfig(const Settings* settings, |
| 29 const LocationRange& specified_from_here, |
| 30 const Label& label, |
| 31 Item* dep_from, |
| 32 Err* err) { |
| 33 DCHECK(!label.is_null()); |
| 34 |
| 35 ItemTree* tree = &settings->build_settings()->item_tree(); |
| 36 base::AutoLock lock(tree->lock()); |
| 37 |
| 38 ItemNode* node = tree->GetExistingNodeLocked(label); |
| 39 Config* config = NULL; |
| 40 if (!node) { |
| 41 config = new Config(label); |
| 42 node = new ItemNode(config); |
| 43 tree->AddNodeLocked(node); |
| 44 |
| 45 // Only schedule loading the given target if somebody is depending on it |
| 46 // (and we optimize by not re-asking it to run the current file). |
| 47 // Otherwise, we're probably generating it right now. |
| 48 if (dep_from && dep_from->label().dir() != label.dir()) { |
| 49 settings->build_settings()->toolchain_manager().ScheduleInvocationLocked( |
| 50 specified_from_here, label.GetToolchainLabel(), label.dir(), |
| 51 err); |
| 52 } |
| 53 } else if ((config = node->item()->AsConfig())) { |
| 54 // Previously saw this item as a config. |
| 55 |
| 56 // If we have no dep_from, we're generating it. In this case, it had better |
| 57 // not already be generated. |
| 58 if (!dep_from && node->state() != ItemNode::REFERENCED) { |
| 59 *err = Err(specified_from_here, "Duplicate config definition.", |
| 60 "You already told me about a config with this name."); |
| 61 return NULL; |
| 62 } |
| 63 } else { |
| 64 // Previously saw this thing as a non-config. |
| 65 *err = Err(specified_from_here, |
| 66 "Config name already used.", |
| 67 "Previously you specified a " + |
| 68 node->item()->GetItemTypeName() + " with this name instead."); |
| 69 return NULL; |
| 70 } |
| 71 |
| 72 // Keep a record of the guy asking us for this dependency. We know if |
| 73 // somebody is adding a dependency, that guy it himself not resolved. |
| 74 if (dep_from && node->state() != ItemNode::RESOLVED) |
| 75 tree->GetExistingNodeLocked(dep_from->label())->AddDependency(node); |
| 76 |
| 77 return config; |
| 78 } |
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