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