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// Copyright 2016 Google Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "cobalt/script/mozjs-45/util/exception_helpers.h"
#include <algorithm>
#include <string>
#include "cobalt/script/mozjs-45/conversion_helpers.h"
#include "cobalt/script/mozjs-45/mozjs_exception_state.h"
#include "third_party/mozjs-45/js/public/UbiNode.h"
#include "third_party/mozjs-45/js/src/builtin/ModuleObject.h"
#include "third_party/mozjs-45/js/src/jsapi.h"
#include "third_party/mozjs-45/js/src/jscntxt.h"
#include "third_party/mozjs-45/js/src/jscntxtinlines.h"
#include "third_party/mozjs-45/js/src/jsfriendapi.h"
#include "third_party/mozjs-45/js/src/jsprf.h"
namespace cobalt {
namespace script {
namespace mozjs {
namespace util {
std::string GetExceptionString(JSContext* context) {
if (!JS_IsExceptionPending(context)) {
return std::string("No exception pending.");
}
JS::RootedValue exception(context);
JS_GetPendingException(context, &exception);
JS_ReportPendingException(context);
return GetExceptionString(context, exception);
}
std::string GetExceptionString(JSContext* context, JS::HandleValue exception) {
std::string exception_string;
MozjsExceptionState exception_state(context);
FromJSValue(context, exception, kNoConversionFlags, &exception_state,
&exception_string);
return exception_string;
}
void GetStackTrace(JSContext* context, size_t max_frames,
nb::RewindableVector<StackFrame>* output) {
DCHECK(output);
output->rewindAll();
JS::RootedObject stack(context);
if (!js::GetContextCompartment(context)) {
LOG(WARNING) << "Tried to get stack trace without access to compartment.";
return;
}
if (!JS::CaptureCurrentStack(context, &stack, max_frames)) {
return;
}
while (stack != NULL) {
StackFrame sf;
JS::RootedString source(context);
uint32_t line;
uint32_t column;
JS::RootedString name(context);
JS::GetSavedFrameSource(context, stack, &source);
JS::GetSavedFrameLine(context, stack, &line);
JS::GetSavedFrameColumn(context, stack, &column);
JS::GetSavedFrameFunctionDisplayName(context, stack, &name);
sf.line_number = static_cast<int>(line);
sf.column_number = static_cast<int>(column);
sf.function_name = "global code";
if (name) {
JS::RootedValue rooted_value(context);
rooted_value.setString(name);
MozjsExceptionState exception_state(context);
FromJSValue(context, rooted_value, kNoConversionFlags, &exception_state,
&sf.function_name);
}
if (source) {
JS::RootedValue rooted_value(context);
rooted_value.setString(source);
MozjsExceptionState exception_state(context);
FromJSValue(context, rooted_value, kNoConversionFlags, &exception_state,
&sf.source_url);
}
output->push_back(sf);
JS::GetSavedFrameParent(context, stack, &stack);
}
}
void GetStackTraceUsingInternalApi(JSContext* context, size_t max_frames,
nb::RewindableVector<StackFrame>* output) {
DCHECK(output);
output->rewindAll();
int frames_captured = 0;
for (js::AllFramesIter it(context);
!it.done() && (max_frames == 0 || frames_captured < max_frames);
++it, ++frames_captured) {
const char* filename = JS_GetScriptFilename(it.script());
unsigned column = 0;
unsigned line = js::PCToLineNumber(it.script(), it.pc(), &column);
StackFrame sf;
sf.source_url = filename;
sf.line_number = line;
sf.column_number = column;
if (it.isFunctionFrame()) {
JSFunction* function = it.callee(context);
if (function->displayAtom()) {
auto* atom = function->displayAtom();
JS::AutoCheckCannotGC nogc;
auto* chars = atom->latin1Chars(nogc);
sf.function_name = std::string(chars, chars + atom->length());
} else {
sf.function_name = "(anonymous function)";
}
} else {
sf.function_name = "global code";
}
output->push_back(sf);
}
}
} // namespace util
} // namespace mozjs
} // namespace script
} // namespace cobalt