1 2 // Copyright 2006-2008 the V8 project authors. All rights reserved. 3 // Redistribution and use in source and binary forms, with or without 4 // modification, are permitted provided that the following conditions are 5 // met: 6 // 7 // * Redistributions of source code must retain the above copyright 8 // notice, this list of conditions and the following disclaimer. 9 // * Redistributions in binary form must reproduce the above 10 // copyright notice, this list of conditions and the following 11 // disclaimer in the documentation and/or other materials provided 12 // with the distribution. 13 // * Neither the name of Google Inc. nor the names of its 14 // contributors may be used to endorse or promote products derived 15 // from this software without specific prior written permission. 16 // 17 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 18 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 19 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 20 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 21 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 22 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 23 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 27 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 29 #include "v8.h" 30 31 #include "api.h" 32 #include "execution.h" 33 #include "spaces-inl.h" 34 #include "top.h" 35 36 namespace v8 { 37 namespace internal { 38 39 40 // If no message listeners have been registered this one is called 41 // by default. 42 void MessageHandler::DefaultMessageReport(const MessageLocation* loc, 43 Handle<Object> message_obj) { 44 SmartPointer<char> str = GetLocalizedMessage(message_obj); 45 if (loc == NULL) { 46 PrintF("%s\n", *str); 47 } else { 48 HandleScope scope; 49 Handle<Object> data(loc->script()->name()); 50 SmartPointer<char> data_str; 51 if (data->IsString()) 52 data_str = Handle<String>::cast(data)->ToCString(DISALLOW_NULLS); 53 PrintF("%s:%i: %s\n", *data_str ? *data_str : "<unknown>", 54 loc->start_pos(), *str); 55 } 56 } 57 58 59 void MessageHandler::ReportMessage(const char* msg) { 60 PrintF("%s\n", msg); 61 } 62 63 64 Handle<Object> MessageHandler::MakeMessageObject( 65 const char* type, 66 MessageLocation* loc, 67 Vector< Handle<Object> > args, 68 Handle<String> stack_trace) { 69 // Build error message object 70 v8::HandleScope scope; // Instantiate a closeable HandleScope for EscapeFrom. 71 Handle<Object> type_str = Factory::LookupAsciiSymbol(type); 72 Handle<Object> array = Factory::NewJSArray(args.length()); 73 for (int i = 0; i < args.length(); i++) 74 SetElement(Handle<JSArray>::cast(array), i, args[i]); 75 76 Handle<JSFunction> fun(Top::global_context()->make_message_fun()); 77 int start, end; 78 Handle<Object> script; 79 if (loc) { 80 start = loc->start_pos(); 81 end = loc->end_pos(); 82 script = GetScriptWrapper(loc->script()); 83 } else { 84 start = end = 0; 85 script = Factory::undefined_value(); 86 } 87 Handle<Object> start_handle(Smi::FromInt(start)); 88 Handle<Object> end_handle(Smi::FromInt(end)); 89 Handle<Object> stack_trace_val = stack_trace.is_null() 90 ? Factory::undefined_value() 91 : Handle<Object>::cast(stack_trace); 92 const int argc = 6; 93 Object** argv[argc] = { type_str.location(), 94 array.location(), 95 start_handle.location(), 96 end_handle.location(), 97 script.location(), 98 stack_trace_val.location() }; 99 100 // Setup a catch handler to catch exceptions in creating the message. This 101 // handler is non-verbose to avoid calling MakeMessage recursively in case of 102 // an exception. 103 v8::TryCatch catcher; 104 catcher.SetVerbose(false); 105 catcher.SetCaptureMessage(false); 106 107 // Format the message. 108 bool caught_exception = false; 109 Handle<Object> message = 110 Execution::Call(fun, Factory::undefined_value(), argc, argv, 111 &caught_exception); 112 113 // If creating the message (in JS code) resulted in an exception, we 114 // skip doing the callback. This usually only happens in case of 115 // stack overflow exceptions being thrown by the parser when the 116 // stack is almost full. 117 if (caught_exception) return Handle<Object>(); 118 119 return message.EscapeFrom(&scope); 120 } 121 122 123 void MessageHandler::ReportMessage(MessageLocation* loc, 124 Handle<Object> message) { 125 v8::Local<v8::Message> api_message_obj = v8::Utils::MessageToLocal(message); 126 127 v8::NeanderArray global_listeners(Factory::message_listeners()); 128 int global_length = global_listeners.length(); 129 if (global_length == 0) { 130 DefaultMessageReport(loc, message); 131 } else { 132 for (int i = 0; i < global_length; i++) { 133 HandleScope scope; 134 if (global_listeners.get(i)->IsUndefined()) continue; 135 v8::NeanderObject listener(JSObject::cast(global_listeners.get(i))); 136 Handle<Proxy> callback_obj(Proxy::cast(listener.get(0))); 137 v8::MessageCallback callback = 138 FUNCTION_CAST<v8::MessageCallback>(callback_obj->proxy()); 139 Handle<Object> callback_data(listener.get(1)); 140 callback(api_message_obj, v8::Utils::ToLocal(callback_data)); 141 } 142 } 143 } 144 145 146 Handle<String> MessageHandler::GetMessage(Handle<Object> data) { 147 Handle<String> fmt_str = Factory::LookupAsciiSymbol("FormatMessage"); 148 Handle<JSFunction> fun = 149 Handle<JSFunction>( 150 JSFunction::cast(Top::builtins()->GetProperty(*fmt_str))); 151 Object** argv[1] = { data.location() }; 152 153 bool caught_exception; 154 Handle<Object> result = 155 Execution::TryCall(fun, Top::builtins(), 1, argv, &caught_exception); 156 157 if (caught_exception || !result->IsString()) { 158 return Factory::LookupAsciiSymbol("<error>"); 159 } 160 Handle<String> result_string = Handle<String>::cast(result); 161 // A string that has been obtained from JS code in this way is 162 // likely to be a complicated ConsString of some sort. We flatten it 163 // here to improve the efficiency of converting it to a C string and 164 // other operations that are likely to take place (see GetLocalizedMessage 165 // for example). 166 FlattenString(result_string); 167 return result_string; 168 } 169 170 171 SmartPointer<char> MessageHandler::GetLocalizedMessage(Handle<Object> data) { 172 HandleScope scope; 173 return GetMessage(data)->ToCString(DISALLOW_NULLS); 174 } 175 176 177 } } // namespace v8::internal 178