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Code Issues Packages 1 Wiki Activity

Better handling of exceptions during snapshot creation.

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This commit is contained in:
Ryan Dahl 2018-07-30 15:12:33 -04:00
parent ae82db54f6
commit db8dc0e9f8
2 changed files with 64 additions and 24 deletions
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2
js/lib.deno.d.ts vendored
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@ -27,8 +27,10 @@ declare class Console {
interface Window {
console: Console;
mainSource: string; // TODO(ry) This shouldn't be global.
}
// Globals in the runtime environment
declare let console: Console;
declare let mainSource: string; // TODO(ry) This shouldn't be global.
declare const window: Window;

86
src/binding.cc
View file

@ -13,6 +13,12 @@
namespace deno {
static bool skip_onerror = false;
Deno* FromIsolate(v8::Isolate* isolate) {
return static_cast<Deno*>(isolate->GetData(0));
}
// Extracts a C string from a v8::V8 Utf8Value.
const char* ToCString(const v8::String::Utf8Value& value) {
return *value ? *value : "<string conversion failed>";
@ -24,10 +30,10 @@ static inline v8::Local<v8::String> v8_str(const char* x) {
.ToLocalChecked();
}
void HandleException(v8::Local<v8::Context> context,
v8::Local<v8::Value> exception) {
void HandleExceptionStr(v8::Local<v8::Context> context,
v8::Local<v8::Value> exception,
std::string* exception_str) {
auto* isolate = context->GetIsolate();
Deno* d = static_cast<Deno*>(isolate->GetData(0));
v8::HandleScope handle_scope(isolate);
v8::Context::Scope context_scope(context);
@ -40,18 +46,23 @@ void HandleException(v8::Local<v8::Context> context,
auto column =
v8::Integer::New(isolate, message->GetStartColumn(context).FromJust());
if (onerror->IsFunction()) {
// window.onerror is set so we try to handle the exception in javascript.
auto func = v8::Local<v8::Function>::Cast(onerror);
v8::Local<v8::Value> args[5];
args[0] = exception->ToString();
args[1] = message->GetScriptResourceName();
args[2] = line;
args[3] = column;
args[4] = exception;
func->Call(context->Global(), 5, args);
/* message, source, lineno, colno, error */
} else if (!stack_trace.IsEmpty()) {
if (skip_onerror == false) {
if (onerror->IsFunction()) {
// window.onerror is set so we try to handle the exception in javascript.
auto func = v8::Local<v8::Function>::Cast(onerror);
v8::Local<v8::Value> args[5];
args[0] = exception->ToString();
args[1] = message->GetScriptResourceName();
args[2] = line;
args[3] = column;
args[4] = exception;
func->Call(context->Global(), 5, args);
/* message, source, lineno, colno, error */
}
}
char buf[12 * 1024];
if (!stack_trace.IsEmpty()) {
// No javascript onerror handler, but we do have a stack trace. Format it
// into a string and add to last_exception.
std::string msg;
@ -64,11 +75,10 @@ void HandleException(v8::Local<v8::Context> context,
v8::String::Utf8Value script_name(isolate, frame->GetScriptName());
int l = frame->GetLineNumber();
int c = frame->GetColumn();
char buf[512];
snprintf(buf, sizeof(buf), "%s %d:%d\n", ToCString(script_name), l, c);
msg += buf;
}
d->last_exception = msg;
*exception_str += msg;
} else {
// No javascript onerror handler, no stack trace. Format the little info we
// have into a string and add to last_exception.
@ -77,10 +87,22 @@ void HandleException(v8::Local<v8::Context> context,
message->GetScriptResourceName());
v8::String::Utf8Value line_str(isolate, line);
v8::String::Utf8Value col_str(isolate, column);
char buf[512];
snprintf(buf, sizeof(buf), "%s\n%s %s:%s\n", ToCString(exceptionStr),
ToCString(script_name), ToCString(line_str), ToCString(col_str));
d->last_exception = std::string(buf);
*exception_str += buf;
}
}
void HandleException(v8::Local<v8::Context> context,
v8::Local<v8::Value> exception) {
v8::Isolate* isolate = context->GetIsolate();
Deno* d = FromIsolate(isolate);
std::string exception_str;
HandleExceptionStr(context, exception, &exception_str);
if (d != nullptr) {
d->last_exception = exception_str;
} else {
printf("Pre-Deno Exception %s\n", exception_str.c_str());
}
}
@ -204,8 +226,9 @@ void Send(const v8::FunctionCallbackInfo<v8::Value>& args) {
d->currentArgs = nullptr;
}
bool Execute(v8::Local<v8::Context> context, const char* js_filename,
const char* js_source) {
bool ExecuteV8StringSource(v8::Local<v8::Context> context,
const char* js_filename,
v8::Local<v8::String> source) {
auto* isolate = context->GetIsolate();
v8::Isolate::Scope isolate_scope(isolate);
v8::HandleScope handle_scope(isolate);
@ -215,7 +238,6 @@ bool Execute(v8::Local<v8::Context> context, const char* js_filename,
v8::TryCatch try_catch(isolate);
auto name = v8_str(js_filename);
auto source = v8_str(js_source);
v8::ScriptOrigin origin(name);
@ -238,6 +260,15 @@ bool Execute(v8::Local<v8::Context> context, const char* js_filename,
return true;
}
bool Execute(v8::Local<v8::Context> context, const char* js_filename,
const char* js_source) {
auto* isolate = context->GetIsolate();
v8::Isolate::Scope isolate_scope(isolate);
v8::HandleScope handle_scope(isolate);
auto source = v8_str(js_source);
return ExecuteV8StringSource(context, js_filename, source);
}
void InitializeContext(v8::Isolate* isolate, v8::Local<v8::Context> context,
const char* js_filename, const char* js_source) {
v8::HandleScope handle_scope(isolate);
@ -260,8 +291,15 @@ void InitializeContext(v8::Isolate* isolate, v8::Local<v8::Context> context,
auto send_val = send_tmpl->GetFunction(context).ToLocalChecked();
CHECK(deno_val->Set(context, deno::v8_str("send"), send_val).FromJust());
bool r = Execute(context, js_filename, js_source);
CHECK(r);
skip_onerror = true;
{
auto source = deno::v8_str(js_source);
CHECK(global->Set(context, deno::v8_str("mainSource"), source).FromJust());
bool r = deno::ExecuteV8StringSource(context, js_filename, source);
CHECK(r);
}
skip_onerror = false;
}
void AddIsolate(Deno* d, v8::Isolate* isolate) {