1 /*
2 * Copyright (C) 2019 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include "link/ResourceExcluder.h"
18
19 #include <algorithm>
20
21 #include "DominatorTree.h"
22 #include "ResourceTable.h"
23 #include "trace/TraceBuffer.h"
24
25 using android::ConfigDescription;
26
27 namespace aapt {
28
29 namespace {
30
RemoveIfExcluded(std::set<std::pair<ConfigDescription,int>> & excluded_configs_,IAaptContext * context,ResourceEntry * entry,ResourceConfigValue * value)31 void RemoveIfExcluded(std::set<std::pair<ConfigDescription, int>>& excluded_configs_,
32 IAaptContext* context,
33 ResourceEntry* entry,
34 ResourceConfigValue* value) {
35 const ConfigDescription& config = value->config;
36
37 // If this entry is a default, ignore
38 if (config == ConfigDescription::DefaultConfig()) {
39 return;
40 }
41
42 for (auto& excluded_pair : excluded_configs_) {
43
44 const ConfigDescription& excluded_config = excluded_pair.first;
45 const int& excluded_diff = excluded_pair.second;
46
47 // Check whether config contains all flags in excluded config
48 int node_diff = config.diff(excluded_config);
49 int masked_diff = excluded_diff & node_diff;
50
51 if (masked_diff == 0) {
52 if (context->IsVerbose()) {
53 context->GetDiagnostics()->Note(
54 DiagMessage(value->value->GetSource())
55 << "excluded resource \""
56 << entry->name
57 << "\" with config "
58 << config.toString());
59 }
60 value->value = {};
61 return;
62 }
63 }
64 }
65
66 } // namespace
67
Consume(IAaptContext * context,ResourceTable * table)68 bool ResourceExcluder::Consume(IAaptContext* context, ResourceTable* table) {
69 TRACE_NAME("ResourceExcluder::Consume");
70 for (auto& package : table->packages) {
71 for (auto& type : package->types) {
72 for (auto& entry : type->entries) {
73 for (auto& value : entry->values) {
74 RemoveIfExcluded(excluded_configs_, context, entry.get(), value.get());
75 }
76
77 // Erase the values that were removed.
78 entry->values.erase(
79 std::remove_if(
80 entry->values.begin(), entry->values.end(),
81 [](const std::unique_ptr<ResourceConfigValue>& val) -> bool {
82 return val == nullptr || val->value == nullptr;
83 }),
84 entry->values.end());
85 }
86 }
87 }
88 return true;
89 }
90
91 } // namespace aapt
92