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// 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);
node->set_originally_referenced_from_here(specified_from_here);
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) {
if (!dep_from->item_node()->AddDependency(
settings->build_settings(), specified_from_here, node, err))
return NULL;
}
return config;
}
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