84 lines
2.5 KiB
C++
84 lines
2.5 KiB
C++
// Copyright (c) 2013 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "tools/gn/import_manager.h"
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#include "base/memory/scoped_ptr.h"
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#include "base/stl_util.h"
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#include "tools/gn/parse_tree.h"
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#include "tools/gn/scheduler.h"
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namespace {
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// Returns a newly-allocated scope on success, null on failure.
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Scope* UncachedImport(const Settings* settings,
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const SourceFile& file,
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const ParseNode* node_for_err,
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Err* err) {
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const ParseNode* node = g_scheduler->input_file_manager()->SyncLoadFile(
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node_for_err->GetRange(), settings->build_settings(), file, err);
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if (!node)
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return NULL;
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const BlockNode* block = node->AsBlock();
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CHECK(block);
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scoped_ptr<Scope> scope(new Scope(settings->base_config()));
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scope->SetProcessingImport();
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block->ExecuteBlockInScope(scope.get(), err);
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if (err->has_error())
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return NULL;
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scope->ClearProcessingImport();
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return scope.release();
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}
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} // namesapce
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ImportManager::ImportManager() {
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}
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ImportManager::~ImportManager() {
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STLDeleteContainerPairSecondPointers(imports_.begin(), imports_.end());
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}
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bool ImportManager::DoImport(const SourceFile& file,
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const ParseNode* node_for_err,
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Scope* scope,
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Err* err) {
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// See if we have a cached import, but be careful to actually do the scope
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// copying outside of the lock.
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const Scope* imported_scope = NULL;
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{
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base::AutoLock lock(lock_);
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ImportMap::const_iterator found = imports_.find(file);
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if (found != imports_.end())
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imported_scope = found->second;
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}
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if (!imported_scope) {
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// Do a new import of the file.
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imported_scope = UncachedImport(scope->settings(), file,
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node_for_err, err);
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if (!imported_scope)
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return false;
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// We loaded the file outside the lock. This means that there could be a
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// race and the file was already loaded on a background thread. Recover
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// from this and use the existing one if that happens.
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{
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base::AutoLock lock(lock_);
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ImportMap::const_iterator found = imports_.find(file);
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if (found != imports_.end()) {
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delete imported_scope;
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imported_scope = found->second;
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} else {
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imports_[file] = imported_scope;
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}
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}
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}
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return imported_scope->NonRecursiveMergeTo(scope, node_for_err,
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"import", err);
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}
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