Revert 214254 "Add initial prototype for the GN meta-buildsystem."

trunk/src/tools/gn/target_manager.cc

-// 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/target_manager.h"
-
-#include <deque>
-
-#include "base/bind.h"
-#include "base/strings/string_piece.h"
-#include "tools/gn/build_settings.h"
-#include "tools/gn/err.h"
-#include "tools/gn/filesystem_utils.h"
-#include "tools/gn/item_node.h"
-#include "tools/gn/scheduler.h"
-#include "tools/gn/toolchain_manager.h"
-#include "tools/gn/value.h"
-
-TargetManager::TargetManager(const BuildSettings* build_settings)
-    : build_settings_(build_settings) {
-}
-
-TargetManager::~TargetManager() {
-}
-
-Target* TargetManager::GetTarget(const Label& label,
-                                 const LocationRange& specified_from_here,
-                                 Target* dep_from,
-                                 Err* err) {
-  DCHECK(!label.is_null());
-  DCHECK(!label.toolchain_dir().value().empty());
-  DCHECK(!label.toolchain_name().empty());
-
-  base::AutoLock lock(build_settings_->item_tree().lock());
-
-  ItemNode* target_node =
-      build_settings_->item_tree().GetExistingNodeLocked(label);
-  Target* target = NULL;
-  if (!target_node) {
-    // First time we've seen this, may need to load the file.
-
-    // Compute the settings. The common case is that we have a dep_from and
-    // the toolchains match, so we can use the settings from there rather than
-    // querying the toolchain manager (which requires locking, etc.).
-    const Settings* settings;
-    if (dep_from && dep_from->label().ToolchainsEqual(label)) {
-      settings = dep_from->settings();
-    } else {
-      settings =
-          build_settings_->toolchain_manager().GetSettingsForToolchainLocked(
-              specified_from_here, label.GetToolchainLabel(), err);
-      if (!settings)
-        return NULL;
-    }
-
-    target = new Target(settings, label);
-    target_node = new ItemNode(target);
-    target_node->set_originally_referenced_from_here(specified_from_here);
-    build_settings_->item_tree().AddNodeLocked(target_node);
-
-    // We're generating a node when there is no referencing one.
-    if (!dep_from)
-      target_node->set_generated_from_here(specified_from_here);
-
-    // 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()) {
-      if (!ScheduleInvocationLocked(specified_from_here, label, err))
-        return NULL;
-    }
-  } else if ((target = target_node->item()->AsTarget())) {
-    // Previously saw this item as a target.
-
-    // If we have no dep_from, we're generating it.
-    if (!dep_from) {
-      // In this case, it had better not already be generated.
-      if (target_node->state() != ItemNode::REFERENCED) {
-        *err = Err(specified_from_here,
-                   "Duplicate target.",
-                   "\"" + label.GetUserVisibleName(true) +
-                   "\" being defined here.");
-        err->AppendSubErr(Err(target_node->generated_from_here(),
-                              "Originally defined here."));
-        return NULL;
-      } else {
-        target_node->set_generated_from_here(specified_from_here);
-      }
-    }
-  } else {
-    // Error, we previously saw this thing as a non-target.
-    *err = Err(specified_from_here, "Not previously a target.",
-        "The target being declared here was previously seen referenced as a\n"
-        "non-target (like a config)");
-    err->AppendSubErr(Err(target_node->originally_referenced_from_here(),
-                          "Originally referenced from here."));
-    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 && target_node->state() != ItemNode::RESOLVED) {
-    build_settings_->item_tree().GetExistingNodeLocked(
-        dep_from->label())->AddDependency(target_node);
-  }
-
-  return target;
-}
-
-void TargetManager::TargetGenerationComplete(const Label& label) {
-  base::AutoLock lock(build_settings_->item_tree().lock());
-  build_settings_->item_tree().MarkItemGeneratedLocked(label);
-}
-
-void TargetManager::GetAllTargets(
-    std::vector<const Target*>* all_targets) const {
-  base::AutoLock lock(build_settings_->item_tree().lock());
-
-  std::vector<const Item*> all_items;
-  build_settings_->item_tree().GetAllItemsLocked(&all_items);
-  for (size_t i = 0; i < all_items.size(); i++) {
-    const Target* t = all_items[i]->AsTarget();
-    if (t)
-      all_targets->push_back(t);
-  }
-}
-
-bool TargetManager::ScheduleInvocationLocked(
-    const LocationRange& specified_from_here,
-    const Label& label,
-    Err* err) {
-  return build_settings_->toolchain_manager().ScheduleInvocationLocked(
-        specified_from_here, label.GetToolchainLabel(), label.dir(), err);
-}