forked from nodejs/node
-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathdebug-agent.cc
More file actions
338 lines (252 loc) · 8.42 KB
/
debug-agent.cc
File metadata and controls
338 lines (252 loc) · 8.42 KB
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
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
// Copyright Fedor Indutny and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.
#include "debug-agent.h"
#include "node.h"
#include "node_internals.h" // ARRAY_SIZE
#include "env.h"
#include "env-inl.h"
#include "v8.h"
#include "v8-debug.h"
#include "util.h"
#include "util-inl.h"
#include <string.h>
namespace node {
namespace debugger {
using v8::Context;
using v8::Function;
using v8::FunctionCallbackInfo;
using v8::FunctionTemplate;
using v8::HandleScope;
using v8::Integer;
using v8::Isolate;
using v8::Local;
using v8::Locker;
using v8::Object;
using v8::String;
using v8::Value;
Agent::Agent(Environment* env) : state_(kNone),
port_(5858),
wait_(false),
parent_env_(env),
child_env_(nullptr),
dispatch_handler_(nullptr) {
int err;
err = uv_sem_init(&start_sem_, 0);
CHECK_EQ(err, 0);
err = uv_mutex_init(&message_mutex_);
CHECK_EQ(err, 0);
}
Agent::~Agent() {
Stop();
uv_sem_destroy(&start_sem_);
uv_mutex_destroy(&message_mutex_);
while (AgentMessage* msg = messages_.PopFront())
delete msg;
}
bool Agent::Start(int port, bool wait) {
int err;
if (state_ == kRunning)
return false;
err = uv_loop_init(&child_loop_);
if (err != 0)
goto loop_init_failed;
// Interruption signal handler
err = uv_async_init(&child_loop_, &child_signal_, ChildSignalCb);
if (err != 0)
goto async_init_failed;
uv_unref(reinterpret_cast<uv_handle_t*>(&child_signal_));
port_ = port;
wait_ = wait;
err = uv_thread_create(&thread_,
reinterpret_cast<uv_thread_cb>(ThreadCb),
this);
if (err != 0)
goto thread_create_failed;
uv_sem_wait(&start_sem_);
state_ = kRunning;
return true;
thread_create_failed:
uv_close(reinterpret_cast<uv_handle_t*>(&child_signal_), nullptr);
async_init_failed:
err = uv_loop_close(&child_loop_);
CHECK_EQ(err, 0);
loop_init_failed:
return false;
}
void Agent::Enable() {
v8::Debug::SetMessageHandler(MessageHandler);
// Assign environment to the debugger's context
// NOTE: The debugger context is created after `SetMessageHandler()` call
parent_env()->AssignToContext(v8::Debug::GetDebugContext());
}
void Agent::Stop() {
int err;
if (state_ != kRunning) {
return;
}
v8::Debug::SetMessageHandler(nullptr);
// Send empty message to terminate things
EnqueueMessage(new AgentMessage(nullptr, 0));
// Signal worker thread to make it stop
err = uv_async_send(&child_signal_);
CHECK_EQ(err, 0);
err = uv_thread_join(&thread_);
CHECK_EQ(err, 0);
uv_close(reinterpret_cast<uv_handle_t*>(&child_signal_), nullptr);
uv_run(&child_loop_, UV_RUN_NOWAIT);
err = uv_loop_close(&child_loop_);
CHECK_EQ(err, 0);
state_ = kNone;
}
void Agent::WorkerRun() {
static const char* argv[] = { "node", "--debug-agent" };
Isolate::CreateParams params;
ArrayBufferAllocator array_buffer_allocator;
params.array_buffer_allocator = &array_buffer_allocator;
Isolate* isolate = Isolate::New(params);
{
Locker locker(isolate);
Isolate::Scope isolate_scope(isolate);
HandleScope handle_scope(isolate);
Local<Context> context = Context::New(isolate);
Context::Scope context_scope(context);
Environment* env = CreateEnvironment(
isolate,
&child_loop_,
context,
ARRAY_SIZE(argv),
argv,
ARRAY_SIZE(argv),
argv);
child_env_ = env;
// Expose API
InitAdaptor(env);
LoadEnvironment(env);
CHECK_EQ(&child_loop_, env->event_loop());
uv_run(&child_loop_, UV_RUN_DEFAULT);
// Clean-up peristent
api_.Reset();
// Clean-up all running handles
env->CleanupHandles();
env->Dispose();
env = nullptr;
}
isolate->Dispose();
}
void Agent::InitAdaptor(Environment* env) {
Isolate* isolate = env->isolate();
HandleScope scope(isolate);
// Create API adaptor
Local<FunctionTemplate> t = FunctionTemplate::New(isolate);
t->InstanceTemplate()->SetInternalFieldCount(1);
t->SetClassName(String::NewFromUtf8(isolate, "DebugAPI"));
NODE_SET_PROTOTYPE_METHOD(t, "notifyListen", NotifyListen);
NODE_SET_PROTOTYPE_METHOD(t, "notifyWait", NotifyWait);
NODE_SET_PROTOTYPE_METHOD(t, "sendCommand", SendCommand);
Local<Object> api = t->GetFunction()->NewInstance();
api->SetAlignedPointerInInternalField(0, this);
api->Set(String::NewFromUtf8(isolate, "port"), Integer::New(isolate, port_));
env->process_object()->Set(String::NewFromUtf8(isolate, "_debugAPI"), api);
api_.Reset(env->isolate(), api);
}
Agent* Agent::Unwrap(const v8::FunctionCallbackInfo<v8::Value>& args) {
void* ptr = args.Holder()->GetAlignedPointerFromInternalField(0);
return reinterpret_cast<Agent*>(ptr);
}
void Agent::NotifyListen(const FunctionCallbackInfo<Value>& args) {
Agent* a = Unwrap(args);
// Notify other thread that we are ready to process events
uv_sem_post(&a->start_sem_);
}
void Agent::NotifyWait(const FunctionCallbackInfo<Value>& args) {
Agent* a = Unwrap(args);
a->wait_ = false;
int err = uv_async_send(&a->child_signal_);
CHECK_EQ(err, 0);
}
void Agent::SendCommand(const FunctionCallbackInfo<Value>& args) {
Agent* a = Unwrap(args);
Environment* env = a->child_env();
HandleScope scope(env->isolate());
String::Value v(args[0]);
v8::Debug::SendCommand(a->parent_env()->isolate(), *v, v.length());
if (a->dispatch_handler_ != nullptr)
a->dispatch_handler_(a->parent_env());
}
void Agent::ThreadCb(Agent* agent) {
agent->WorkerRun();
}
void Agent::ChildSignalCb(uv_async_t* signal) {
Agent* a = ContainerOf(&Agent::child_signal_, signal);
Isolate* isolate = a->child_env()->isolate();
HandleScope scope(isolate);
Local<Object> api = PersistentToLocal(isolate, a->api_);
uv_mutex_lock(&a->message_mutex_);
while (AgentMessage* msg = a->messages_.PopFront()) {
// Time to close everything
if (msg->data() == nullptr) {
delete msg;
MakeCallback(isolate, api, "onclose", 0, nullptr);
break;
}
// Waiting for client, do not send anything just yet
if (a->wait_) {
a->messages_.PushFront(msg); // Push message back into the ready queue.
break;
}
Local<Value> argv[] = {
String::NewFromTwoByte(isolate,
msg->data(),
String::kNormalString,
msg->length())
};
// Emit message
MakeCallback(isolate,
api,
"onmessage",
ARRAY_SIZE(argv),
argv);
delete msg;
}
uv_mutex_unlock(&a->message_mutex_);
}
void Agent::EnqueueMessage(AgentMessage* message) {
uv_mutex_lock(&message_mutex_);
messages_.PushBack(message);
uv_mutex_unlock(&message_mutex_);
uv_async_send(&child_signal_);
}
void Agent::MessageHandler(const v8::Debug::Message& message) {
Isolate* isolate = message.GetIsolate();
Environment* env = Environment::GetCurrent(isolate);
if (env == nullptr)
return; // Called from a non-node context.
Agent* a = env->debugger_agent();
CHECK_NE(a, nullptr);
CHECK_EQ(isolate, a->parent_env()->isolate());
HandleScope scope(isolate);
Local<String> json = message.GetJSON();
String::Value v(json);
AgentMessage* msg = new AgentMessage(*v, v.length());
a->EnqueueMessage(msg);
}
} // namespace debugger
} // namespace node