1 // Copyright 2011 the V8 project authors. All rights reserved.
2 // Redistribution and use in source and binary forms, with or without
3 // modification, are permitted provided that the following conditions are
4 // met:
5 //
6 // * Redistributions of source code must retain the above copyright
7 // notice, this list of conditions and the following disclaimer.
8 // * Redistributions in binary form must reproduce the above
9 // copyright notice, this list of conditions and the following
10 // disclaimer in the documentation and/or other materials provided
11 // with the distribution.
12 // * Neither the name of Google Inc. nor the names of its
13 // contributors may be used to endorse or promote products derived
14 // from this software without specific prior written permission.
15 //
16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27
28 #include "v8.h"
29
30 #include "api.h"
31 #include "execution.h"
32 #include "messages.h"
33 #include "spaces-inl.h"
34
35 namespace v8 {
36 namespace internal {
37
38
39 // If no message listeners have been registered this one is called
40 // by default.
DefaultMessageReport(const MessageLocation * loc,Handle<Object> message_obj)41 void MessageHandler::DefaultMessageReport(const MessageLocation* loc,
42 Handle<Object> message_obj) {
43 SmartArrayPointer<char> str = GetLocalizedMessage(message_obj);
44 if (loc == NULL) {
45 PrintF("%s\n", *str);
46 } else {
47 HandleScope scope;
48 Handle<Object> data(loc->script()->name());
49 SmartArrayPointer<char> data_str;
50 if (data->IsString())
51 data_str = Handle<String>::cast(data)->ToCString(DISALLOW_NULLS);
52 PrintF("%s:%i: %s\n", *data_str ? *data_str : "<unknown>",
53 loc->start_pos(), *str);
54 }
55 }
56
57
MakeMessageObject(const char * type,MessageLocation * loc,Vector<Handle<Object>> args,Handle<String> stack_trace,Handle<JSArray> stack_frames)58 Handle<JSMessageObject> MessageHandler::MakeMessageObject(
59 const char* type,
60 MessageLocation* loc,
61 Vector< Handle<Object> > args,
62 Handle<String> stack_trace,
63 Handle<JSArray> stack_frames) {
64 Handle<String> type_handle = FACTORY->LookupAsciiSymbol(type);
65 Handle<FixedArray> arguments_elements =
66 FACTORY->NewFixedArray(args.length());
67 for (int i = 0; i < args.length(); i++) {
68 arguments_elements->set(i, *args[i]);
69 }
70 Handle<JSArray> arguments_handle =
71 FACTORY->NewJSArrayWithElements(arguments_elements);
72
73 int start = 0;
74 int end = 0;
75 Handle<Object> script_handle = FACTORY->undefined_value();
76 if (loc) {
77 start = loc->start_pos();
78 end = loc->end_pos();
79 script_handle = GetScriptWrapper(loc->script());
80 }
81
82 Handle<Object> stack_trace_handle = stack_trace.is_null()
83 ? Handle<Object>::cast(FACTORY->undefined_value())
84 : Handle<Object>::cast(stack_trace);
85
86 Handle<Object> stack_frames_handle = stack_frames.is_null()
87 ? Handle<Object>::cast(FACTORY->undefined_value())
88 : Handle<Object>::cast(stack_frames);
89
90 Handle<JSMessageObject> message =
91 FACTORY->NewJSMessageObject(type_handle,
92 arguments_handle,
93 start,
94 end,
95 script_handle,
96 stack_trace_handle,
97 stack_frames_handle);
98
99 return message;
100 }
101
102
ReportMessage(Isolate * isolate,MessageLocation * loc,Handle<Object> message)103 void MessageHandler::ReportMessage(Isolate* isolate,
104 MessageLocation* loc,
105 Handle<Object> message) {
106 // We are calling into embedder's code which can throw exceptions.
107 // Thus we need to save current exception state, reset it to the clean one
108 // and ignore scheduled exceptions callbacks can throw.
109 Isolate::ExceptionScope exception_scope(isolate);
110 isolate->clear_pending_exception();
111 isolate->set_external_caught_exception(false);
112
113 v8::Local<v8::Message> api_message_obj = v8::Utils::MessageToLocal(message);
114
115 v8::NeanderArray global_listeners(FACTORY->message_listeners());
116 int global_length = global_listeners.length();
117 if (global_length == 0) {
118 DefaultMessageReport(loc, message);
119 if (isolate->has_scheduled_exception()) {
120 isolate->clear_scheduled_exception();
121 }
122 } else {
123 for (int i = 0; i < global_length; i++) {
124 HandleScope scope;
125 if (global_listeners.get(i)->IsUndefined()) continue;
126 v8::NeanderObject listener(JSObject::cast(global_listeners.get(i)));
127 Handle<Foreign> callback_obj(Foreign::cast(listener.get(0)));
128 v8::MessageCallback callback =
129 FUNCTION_CAST<v8::MessageCallback>(callback_obj->foreign_address());
130 Handle<Object> callback_data(listener.get(1));
131 {
132 // Do not allow exceptions to propagate.
133 v8::TryCatch try_catch;
134 callback(api_message_obj, v8::Utils::ToLocal(callback_data));
135 }
136 if (isolate->has_scheduled_exception()) {
137 isolate->clear_scheduled_exception();
138 }
139 }
140 }
141 }
142
143
GetMessage(Handle<Object> data)144 Handle<String> MessageHandler::GetMessage(Handle<Object> data) {
145 Handle<String> fmt_str = FACTORY->LookupAsciiSymbol("FormatMessage");
146 Handle<JSFunction> fun =
147 Handle<JSFunction>(
148 JSFunction::cast(
149 Isolate::Current()->js_builtins_object()->
150 GetPropertyNoExceptionThrown(*fmt_str)));
151 Handle<Object> argv[] = { data };
152
153 bool caught_exception;
154 Handle<Object> result =
155 Execution::TryCall(fun,
156 Isolate::Current()->js_builtins_object(),
157 ARRAY_SIZE(argv),
158 argv,
159 &caught_exception);
160
161 if (caught_exception || !result->IsString()) {
162 return FACTORY->LookupAsciiSymbol("<error>");
163 }
164 Handle<String> result_string = Handle<String>::cast(result);
165 // A string that has been obtained from JS code in this way is
166 // likely to be a complicated ConsString of some sort. We flatten it
167 // here to improve the efficiency of converting it to a C string and
168 // other operations that are likely to take place (see GetLocalizedMessage
169 // for example).
170 FlattenString(result_string);
171 return result_string;
172 }
173
174
GetLocalizedMessage(Handle<Object> data)175 SmartArrayPointer<char> MessageHandler::GetLocalizedMessage(
176 Handle<Object> data) {
177 HandleScope scope;
178 return GetMessage(data)->ToCString(DISALLOW_NULLS);
179 }
180
181
182 } } // namespace v8::internal
183