1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
|
// 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.
#ifndef TOOLS_GN_LOADER_H_
#define TOOLS_GN_LOADER_H_
#include <map>
#include <set>
#include "base/callback.h"
#include "base/memory/ref_counted.h"
#include "tools/gn/label.h"
#include "tools/gn/scope.h"
namespace base {
class MessageLoop;
}
class BuildSettings;
class LocationRange;
class Settings;
class SourceFile;
class Toolchain;
// The loader manages execution of the different build files. It receives
// requests (normally from the Builder) when new references are found, and also
// manages loading the build config files.
//
// This loader class is abstract so it can be mocked out for testing the
// Builder.
class Loader : public base::RefCountedThreadSafe<Loader> {
public:
Loader();
// Loads the given file in the conext of the given toolchain. The initial
// call to this (the one that actually starts the generation) should have an
// empty toolchain name, which will trigger the load of the default build
// config.
virtual void Load(const SourceFile& file,
const LocationRange& origin,
const Label& toolchain_name) = 0;
// Notification that the given toolchain has loaded. This will unblock files
// waiting on this definition.
virtual void ToolchainLoaded(const Toolchain* toolchain) = 0;
// Returns the label of the default toolchain.
virtual Label GetDefaultToolchain() const = 0;
// Returns information about the toolchain with the given label. Will return
// false if we haven't processed this toolchain yet.
virtual const Settings* GetToolchainSettings(const Label& label) const = 0;
// Helper function that extracts the file and toolchain name from the given
// label, and calls Load().
void Load(const Label& label, const LocationRange& origin);
// Returns the build file that the given label references.
static SourceFile BuildFileForLabel(const Label& label);
// When processing the default build config, we want to capture the argument
// of set_default_build_config. The implementation of that function uses this
// constant as a property key to get the Label* out of the scope where the
// label should be stored.
static const void* kDefaultToolchainKey;
protected:
friend class base::RefCountedThreadSafe<Loader>;
virtual ~Loader();
};
class LoaderImpl : public Loader {
public:
// Callback to emulate InputFileManager::AsyncLoadFile.
typedef base::Callback<bool(const LocationRange&,
const BuildSettings*,
const SourceFile&,
const base::Callback<void(const ParseNode*)>&,
Err*)> AsyncLoadFileCallback;
explicit LoaderImpl(const BuildSettings* build_settings);
// Loader implementation.
void Load(const SourceFile& file,
const LocationRange& origin,
const Label& toolchain_name) override;
void ToolchainLoaded(const Toolchain* toolchain) override;
Label GetDefaultToolchain() const override;
const Settings* GetToolchainSettings(const Label& label) const override;
// Sets the message loop corresponding to the main thread. By default this
// class will use the thread active during construction, but there is not
// a message loop active during construction all the time.
void set_main_loop(base::MessageLoop* loop) { main_loop_ = loop; }
// The complete callback is called whenever there are no more pending loads.
// Called on the main thread only. This may be called more than once if the
// queue is drained, but then more stuff gets added.
void set_complete_callback(const base::Closure& cb) {
complete_callback_ = cb;
}
// This callback is used when the loader finds it wants to load a file.
void set_async_load_file(const AsyncLoadFileCallback& cb) {
async_load_file_ = cb;
}
const Label& default_toolchain_label() const {
return default_toolchain_label_;
}
private:
struct LoadID;
struct ToolchainRecord;
~LoaderImpl() override;
// Schedules the input file manager to load the given file.
void ScheduleLoadFile(const Settings* settings,
const LocationRange& origin,
const SourceFile& file);
void ScheduleLoadBuildConfig(
Settings* settings,
const Scope::KeyValueMap& toolchain_overrides);
// Runs the given file on the background thread. These are called by the
// input file manager.
void BackgroundLoadFile(const Settings* settings,
const SourceFile& file_name,
const ParseNode* root);
void BackgroundLoadBuildConfig(
Settings* settings,
const Scope::KeyValueMap& toolchain_overrides,
const ParseNode* root);
// Posted to the main thread when any file other than a build config file
// file has completed running.
void DidLoadFile();
// Posted to the main thread when any build config file has completed
// running. The label should be the name of the toolchain.
//
// If there is no defauled toolchain loaded yet, we'll assume that the first
// call to this indicates to the default toolchain, and this function will
// set the default toolchain name to the given label.
void DidLoadBuildConfig(const Label& label);
// Decrements the pending_loads_ variable and issues the complete callback if
// necessary.
void DecrementPendingLoads();
// Forwards to the appropriate location to load the file.
bool AsyncLoadFile(const LocationRange& origin,
const BuildSettings* build_settings,
const SourceFile& file_name,
const base::Callback<void(const ParseNode*)>& callback,
Err* err);
base::MessageLoop* main_loop_;
int pending_loads_;
base::Closure complete_callback_;
// When non-null, use this callback instead of the InputFileManager for
// mocking purposes.
AsyncLoadFileCallback async_load_file_;
typedef std::set<LoadID> LoadIDSet;
LoadIDSet invocations_;
const BuildSettings* build_settings_;
Label default_toolchain_label_;
// Records for the build config file loads.
// Owning pointers.
typedef std::map<Label, ToolchainRecord*> ToolchainRecordMap;
ToolchainRecordMap toolchain_records_;
};
#endif // TOOLS_GN_LOADER_H_
|
