This repository was archived by the owner on Oct 15, 2020. It is now read-only.
-
-
Notifications
You must be signed in to change notification settings - Fork 341
Expand file tree
/
Copy pathnode_errors.cc
More file actions
438 lines (371 loc) · 13.7 KB
/
node_errors.cc
File metadata and controls
438 lines (371 loc) · 13.7 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
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
#include <stdarg.h>
#include "node_errors.h"
#include "node_internals.h"
namespace node {
using v8::Context;
using v8::Exception;
using v8::Function;
using v8::FunctionCallbackInfo;
using v8::HandleScope;
using v8::Int32;
using v8::Isolate;
using v8::Just;
using v8::Local;
using v8::Maybe;
using v8::MaybeLocal;
using v8::Message;
using v8::NewStringType;
using v8::Number;
using v8::Object;
using v8::ScriptOrigin;
using v8::String;
using v8::Undefined;
using v8::Value;
bool IsExceptionDecorated(Environment* env, Local<Value> er) {
if (!er.IsEmpty() && er->IsObject()) {
Local<Object> err_obj = er.As<Object>();
auto maybe_value =
err_obj->GetPrivate(env->context(), env->decorated_private_symbol());
Local<Value> decorated;
return maybe_value.ToLocal(&decorated) && decorated->IsTrue();
}
return false;
}
void AppendExceptionLine(Environment* env,
Local<Value> er,
Local<Message> message,
enum ErrorHandlingMode mode) {
if (message.IsEmpty()) return;
HandleScope scope(env->isolate());
Local<Object> err_obj;
if (!er.IsEmpty() && er->IsObject()) {
err_obj = er.As<Object>();
}
// Print (filename):(line number): (message).
ScriptOrigin origin = message->GetScriptOrigin();
node::Utf8Value filename(env->isolate(), message->GetScriptResourceName());
const char* filename_string = *filename;
int linenum = message->GetLineNumber(env->context()).FromJust();
// Print line of source code.
MaybeLocal<String> source_line_maybe = message->GetSourceLine(env->context());
node::Utf8Value sourceline(env->isolate(),
source_line_maybe.ToLocalChecked());
const char* sourceline_string = *sourceline;
if (strstr(sourceline_string, "node-do-not-add-exception-line") != nullptr)
return;
// Because of how node modules work, all scripts are wrapped with a
// "function (module, exports, __filename, ...) {"
// to provide script local variables.
//
// When reporting errors on the first line of a script, this wrapper
// function is leaked to the user. There used to be a hack here to
// truncate off the first 62 characters, but it caused numerous other
// problems when vm.runIn*Context() methods were used for non-module
// code.
//
// If we ever decide to re-instate such a hack, the following steps
// must be taken:
//
// 1. Pass a flag around to say "this code was wrapped"
// 2. Update the stack frame output so that it is also correct.
//
// It would probably be simpler to add a line rather than add some
// number of characters to the first line, since V8 truncates the
// sourceline to 78 characters, and we end up not providing very much
// useful debugging info to the user if we remove 62 characters.
int script_start = (linenum - origin.ResourceLineOffset()->Value()) == 1
? origin.ResourceColumnOffset()->Value()
: 0;
int start = message->GetStartColumn(env->context()).FromMaybe(0);
int end = message->GetEndColumn(env->context()).FromMaybe(0);
if (start >= script_start) {
CHECK_GE(end, start);
start -= script_start;
end -= script_start;
}
char arrow[1024];
int max_off = sizeof(arrow) - 2;
int off = snprintf(arrow,
sizeof(arrow),
"%s:%i\n%s\n",
filename_string,
linenum,
sourceline_string);
CHECK_GE(off, 0);
if (off > max_off) {
off = max_off;
}
// Print wavy underline (GetUnderline is deprecated).
for (int i = 0; i < start; i++) {
if (sourceline_string[i] == '\0' || off >= max_off) {
break;
}
CHECK_LT(off, max_off);
arrow[off++] = (sourceline_string[i] == '\t') ? '\t' : ' ';
}
for (int i = start; i < end; i++) {
if (sourceline_string[i] == '\0' || off >= max_off) {
break;
}
CHECK_LT(off, max_off);
arrow[off++] = '^';
}
CHECK_LE(off, max_off);
arrow[off] = '\n';
arrow[off + 1] = '\0';
Local<String> arrow_str =
String::NewFromUtf8(env->isolate(), arrow, NewStringType::kNormal)
.ToLocalChecked();
const bool can_set_arrow = !arrow_str.IsEmpty() && !err_obj.IsEmpty();
// If allocating arrow_str failed, print it out. There's not much else to do.
// If it's not an error, but something needs to be printed out because
// it's a fatal exception, also print it out from here.
// Otherwise, the arrow property will be attached to the object and handled
// by the caller.
if (!can_set_arrow || (mode == FATAL_ERROR && !err_obj->IsNativeError())) {
if (env->printed_error()) return;
Mutex::ScopedLock lock(process_mutex);
env->set_printed_error(true);
uv_tty_reset_mode();
PrintErrorString("\n%s", arrow);
return;
}
CHECK(err_obj
->SetPrivate(
env->context(), env->arrow_message_private_symbol(), arrow_str)
.FromMaybe(false));
}
[[noreturn]] void Abort() {
DumpBacktrace(stderr);
fflush(stderr);
ABORT_NO_BACKTRACE();
}
[[noreturn]] void Assert(const char* const (*args)[4]) {
auto filename = (*args)[0];
auto linenum = (*args)[1];
auto message = (*args)[2];
auto function = (*args)[3];
char name[1024];
GetHumanReadableProcessName(&name);
fprintf(stderr,
"%s: %s:%s:%s%s Assertion `%s' failed.\n",
name,
filename,
linenum,
function,
*function ? ":" : "",
message);
fflush(stderr);
Abort();
}
void ReportException(Environment* env,
Local<Value> er,
Local<Message> message) {
CHECK(!er.IsEmpty());
HandleScope scope(env->isolate());
if (message.IsEmpty()) message = Exception::CreateMessage(env->isolate(), er);
AppendExceptionLine(env, er, message, FATAL_ERROR);
Local<Value> trace_value;
Local<Value> arrow;
const bool decorated = IsExceptionDecorated(env, er);
if (er->IsUndefined() || er->IsNull()) {
trace_value = Undefined(env->isolate());
} else {
Local<Object> err_obj = er->ToObject(env->context()).ToLocalChecked();
trace_value = err_obj->Get(env->context(),
env->stack_string()).ToLocalChecked();
arrow =
err_obj->GetPrivate(env->context(), env->arrow_message_private_symbol())
.ToLocalChecked();
}
node::Utf8Value trace(env->isolate(), trace_value);
// range errors have a trace member set to undefined
if (trace.length() > 0 && !trace_value->IsUndefined()) {
if (arrow.IsEmpty() || !arrow->IsString() || decorated) {
PrintErrorString("%s\n", *trace);
} else {
node::Utf8Value arrow_string(env->isolate(), arrow);
PrintErrorString("%s\n%s\n", *arrow_string, *trace);
}
} else {
// this really only happens for RangeErrors, since they're the only
// kind that won't have all this info in the trace, or when non-Error
// objects are thrown manually.
Local<Value> message;
Local<Value> name;
if (er->IsObject()) {
Local<Object> err_obj = er.As<Object>();
message = err_obj->Get(env->context(),
env->message_string()).ToLocalChecked();
name = err_obj->Get(env->context(),
FIXED_ONE_BYTE_STRING(env->isolate(), "name")).ToLocalChecked();
}
if (message.IsEmpty() || message->IsUndefined() || name.IsEmpty() ||
name->IsUndefined()) {
// Not an error object. Just print as-is.
String::Utf8Value message(env->isolate(), er);
PrintErrorString("%s\n",
*message ? *message : "<toString() threw exception>");
} else {
node::Utf8Value name_string(env->isolate(), name);
node::Utf8Value message_string(env->isolate(), message);
if (arrow.IsEmpty() || !arrow->IsString() || decorated) {
PrintErrorString("%s: %s\n", *name_string, *message_string);
} else {
node::Utf8Value arrow_string(env->isolate(), arrow);
PrintErrorString(
"%s\n%s: %s\n", *arrow_string, *name_string, *message_string);
}
}
}
fflush(stderr);
#if HAVE_INSPECTOR
env->inspector_agent()->FatalException(er, message);
#endif
}
void ReportException(Environment* env, const v8::TryCatch& try_catch) {
ReportException(env, try_catch.Exception(), try_catch.Message());
}
void PrintErrorString(const char* format, ...) {
va_list ap;
va_start(ap, format);
#ifdef _WIN32
HANDLE stderr_handle = GetStdHandle(STD_ERROR_HANDLE);
// Check if stderr is something other than a tty/console
if (stderr_handle == INVALID_HANDLE_VALUE || stderr_handle == nullptr ||
uv_guess_handle(_fileno(stderr)) != UV_TTY) {
vfprintf(stderr, format, ap);
va_end(ap);
return;
}
// Fill in any placeholders
int n = _vscprintf(format, ap);
std::vector<char> out(n + 1);
vsprintf(out.data(), format, ap);
// Get required wide buffer size
n = MultiByteToWideChar(CP_UTF8, 0, out.data(), -1, nullptr, 0);
std::vector<wchar_t> wbuf(n);
MultiByteToWideChar(CP_UTF8, 0, out.data(), -1, wbuf.data(), n);
// Don't include the null character in the output
CHECK_GT(n, 0);
WriteConsoleW(stderr_handle, wbuf.data(), n - 1, nullptr, nullptr);
#else
vfprintf(stderr, format, ap);
#endif
va_end(ap);
}
[[noreturn]] void FatalError(const char* location, const char* message) {
OnFatalError(location, message);
// to suppress compiler warning
ABORT();
}
void OnFatalError(const char* location, const char* message) {
if (location) {
PrintErrorString("FATAL ERROR: %s %s\n", location, message);
} else {
PrintErrorString("FATAL ERROR: %s\n", message);
}
fflush(stderr);
ABORT();
}
namespace errors {
TryCatchScope::~TryCatchScope() {
if (HasCaught() && mode_ == CatchMode::kFatal) {
HandleScope scope(env_->isolate());
ReportException(env_, Exception(), Message());
exit(7);
}
}
} // namespace errors
void DecorateErrorStack(Environment* env,
const errors::TryCatchScope& try_catch) {
Local<Value> exception = try_catch.Exception();
if (!exception->IsObject()) return;
Local<Object> err_obj = exception.As<Object>();
if (IsExceptionDecorated(env, err_obj)) return;
AppendExceptionLine(env, exception, try_catch.Message(), CONTEXTIFY_ERROR);
Local<Value> stack =
err_obj->Get(env->context(), env->stack_string()).ToLocalChecked();
MaybeLocal<Value> maybe_value =
err_obj->GetPrivate(env->context(), env->arrow_message_private_symbol());
Local<Value> arrow;
if (!(maybe_value.ToLocal(&arrow) && arrow->IsString())) {
return;
}
if (stack.IsEmpty() || !stack->IsString()) {
return;
}
Local<String> decorated_stack = String::Concat(
env->isolate(),
String::Concat(env->isolate(),
arrow.As<String>(),
FIXED_ONE_BYTE_STRING(env->isolate(), "\n")),
stack.As<String>());
err_obj->Set(env->context(), env->stack_string(), decorated_stack).FromJust();
err_obj->SetPrivate(
env->context(), env->decorated_private_symbol(), True(env->isolate()));
}
void FatalException(Isolate* isolate,
Local<Value> error,
Local<Message> message) {
HandleScope scope(isolate);
Environment* env = Environment::GetCurrent(isolate);
CHECK_NOT_NULL(env); // TODO(addaleax): Handle nullptr here.
Local<Object> process_object = env->process_object();
Local<String> fatal_exception_string = env->fatal_exception_string();
Local<Value> fatal_exception_function =
process_object->Get(env->context(),
fatal_exception_string).ToLocalChecked();
if (!fatal_exception_function->IsFunction()) {
// Failed before the process._fatalException function was added!
// this is probably pretty bad. Nothing to do but report and exit.
ReportException(env, error, message);
exit(6);
} else {
errors::TryCatchScope fatal_try_catch(env);
// Do not call FatalException when _fatalException handler throws
fatal_try_catch.SetVerbose(false);
// This will return true if the JS layer handled it, false otherwise
MaybeLocal<Value> caught = fatal_exception_function.As<Function>()->Call(
env->context(), process_object, 1, &error);
if (fatal_try_catch.HasTerminated()) return;
if (fatal_try_catch.HasCaught()) {
// The fatal exception function threw, so we must exit
ReportException(env, fatal_try_catch);
exit(7);
} else if (caught.ToLocalChecked()->IsFalse()) {
ReportException(env, error, message);
// fatal_exception_function call before may have set a new exit code ->
// read it again, otherwise use default for uncaughtException 1
Local<String> exit_code = env->exit_code_string();
Local<Value> code;
if (!process_object->Get(env->context(), exit_code).ToLocal(&code) ||
!code->IsInt32()) {
exit(1);
}
exit(code.As<Int32>()->Value());
}
}
}
void FatalException(Isolate* isolate, const v8::TryCatch& try_catch) {
// If we try to print out a termination exception, we'd just get 'null',
// so just crashing here with that information seems like a better idea,
// and in particular it seems like we should handle terminations at the call
// site for this function rather than by printing them out somewhere.
CHECK(!try_catch.HasTerminated());
HandleScope scope(isolate);
if (!try_catch.IsVerbose()) {
FatalException(isolate, try_catch.Exception(), try_catch.Message());
}
}
void FatalException(const FunctionCallbackInfo<Value>& args) {
Isolate* isolate = args.GetIsolate();
Environment* env = Environment::GetCurrent(isolate);
if (env != nullptr && env->abort_on_uncaught_exception()) {
Abort();
}
Local<Value> exception = args[0];
Local<Message> message = Exception::CreateMessage(isolate, exception);
FatalException(isolate, exception, message);
}
} // namespace node