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// Copyright 2017 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "include/v8-context.h"
#include "include/v8-exception.h"
#include "include/v8-isolate.h"
#include "include/v8-local-handle.h"
#include "include/v8-persistent-handle.h"
#include "include/v8-template.h"
#include "src/flags/flags.h"
#include "test/unittests/test-utils.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace v8 {
namespace {
class APIExceptionTest : public TestWithIsolate {
public:
static void CEvaluate(const v8::FunctionCallbackInfo<v8::Value>& args) {
v8::HandleScope scope(args.GetIsolate());
TryRunJS(args.GetIsolate(),
args[0]
->ToString(args.GetIsolate()->GetCurrentContext())
.ToLocalChecked());
}
static void CCatcher(const v8::FunctionCallbackInfo<v8::Value>& args) {
if (args.Length() < 1) {
args.GetReturnValue().Set(false);
return;
}
v8::HandleScope scope(args.GetIsolate());
v8::TryCatch try_catch(args.GetIsolate());
MaybeLocal<Value> result =
TryRunJS(args.GetIsolate(),
args[0]
->ToString(args.GetIsolate()->GetCurrentContext())
.ToLocalChecked());
CHECK(!try_catch.HasCaught() || result.IsEmpty());
args.GetReturnValue().Set(try_catch.HasCaught());
}
};
class V8_NODISCARD ScopedExposeGc {
public:
ScopedExposeGc() : was_exposed_(i::v8_flags.expose_gc) {
i::v8_flags.expose_gc = true;
}
~ScopedExposeGc() { i::v8_flags.expose_gc = was_exposed_; }
private:
const bool was_exposed_;
};
TEST_F(APIExceptionTest, ExceptionMessageDoesNotKeepContextAlive) {
i::DisableConservativeStackScanningScopeForTesting no_stack_scanning(
i_isolate()->heap());
ScopedExposeGc expose_gc;
Persistent<Context> weak_context;
{
HandleScope handle_scope(isolate());
Local<Context> context = Context::New(isolate());
weak_context.Reset(isolate(), context);
weak_context.SetWeak();
Context::Scope context_scope(context);
TryCatch try_catch(isolate());
isolate()->ThrowException(Undefined(isolate()));
}
isolate()->RequestGarbageCollectionForTesting(
Isolate::kFullGarbageCollection);
EXPECT_TRUE(weak_context.IsEmpty());
}
TEST_F(APIExceptionTest, TryCatchCustomException) {
v8::HandleScope scope(isolate());
v8::Local<Context> context = Context::New(isolate());
v8::Context::Scope context_scope(context);
v8::TryCatch try_catch(isolate());
TryRunJS(
"function CustomError() { this.a = 'b'; }"
"(function f() { throw new CustomError(); })();");
EXPECT_TRUE(try_catch.HasCaught());
EXPECT_TRUE(try_catch.Exception()
->ToObject(context)
.ToLocalChecked()
->Get(context, NewString("a"))
.ToLocalChecked()
->Equals(context, NewString("b"))
.FromJust());
}
class TryCatchNestedTest : public TestWithIsolate {
public:
void TryCatchNested1Helper(int depth) {
if (depth > 0) {
v8::TryCatch try_catch(isolate());
try_catch.SetVerbose(true);
TryCatchNested1Helper(depth - 1);
EXPECT_TRUE(try_catch.HasCaught());
try_catch.ReThrow();
} else {
isolate()->ThrowException(NewString("E1"));
}
}
void TryCatchNested2Helper(int depth) {
if (depth > 0) {
v8::TryCatch try_catch(isolate());
try_catch.SetVerbose(true);
TryCatchNested2Helper(depth - 1);
EXPECT_TRUE(try_catch.HasCaught());
try_catch.ReThrow();
} else {
TryRunJS("throw 'E2';");
}
}
};
TEST_F(TryCatchNestedTest, TryCatchNested) {
v8::HandleScope scope(isolate());
Local<Context> context = Context::New(isolate());
v8::Context::Scope context_scope(context);
{
// Test nested try-catch with a native throw in the end.
v8::TryCatch try_catch(isolate());
TryCatchNested1Helper(5);
EXPECT_TRUE(try_catch.HasCaught());
EXPECT_EQ(
0,
strcmp(*v8::String::Utf8Value(isolate(), try_catch.Exception()), "E1"));
}
{
// Test nested try-catch with a JavaScript throw in the end.
v8::TryCatch try_catch(isolate());
TryCatchNested2Helper(5);
EXPECT_TRUE(try_catch.HasCaught());
EXPECT_EQ(
0,
strcmp(*v8::String::Utf8Value(isolate(), try_catch.Exception()), "E2"));
}
}
TEST_F(APIExceptionTest, TryCatchFinallyUsingTryCatchHandler) {
v8::HandleScope scope(isolate());
Local<Context> context = Context::New(isolate());
v8::Context::Scope context_scope(context);
v8::TryCatch try_catch(isolate());
TryRunJS("try { throw ''; } catch (e) {}");
EXPECT_TRUE(!try_catch.HasCaught());
TryRunJS("try { throw ''; } finally {}");
EXPECT_TRUE(try_catch.HasCaught());
try_catch.Reset();
TryRunJS(
"(function() {"
"try { throw ''; } finally { return; }"
"})()");
EXPECT_TRUE(!try_catch.HasCaught());
TryRunJS(
"(function()"
" { try { throw ''; } finally { throw 0; }"
"})()");
EXPECT_TRUE(try_catch.HasCaught());
}
TEST_F(APIExceptionTest, TryFinallyMessage) {
v8::HandleScope scope(isolate());
v8::Local<Context> context = Context::New(isolate());
v8::Context::Scope context_scope(context);
{
// Test that the original error message is not lost if there is a
// recursive call into Javascript is done in the finally block, e.g. to
// initialize an IC. (crbug.com/129171)
TryCatch try_catch(isolate());
const char* trigger_ic =
"try { \n"
" throw new Error('test'); \n"
"} finally { \n"
" var x = 0; \n"
" x++; \n" // Trigger an IC initialization here.
"} \n";
TryRunJS(trigger_ic);
EXPECT_TRUE(try_catch.HasCaught());
Local<Message> message = try_catch.Message();
EXPECT_TRUE(!message.IsEmpty());
EXPECT_EQ(2, message->GetLineNumber(context).FromJust());
}
{
// Test that the original exception message is indeed overwritten if
// a new error is thrown in the finally block.
TryCatch try_catch(isolate());
const char* throw_again =
"try { \n"
" throw new Error('test'); \n"
"} finally { \n"
" var x = 0; \n"
" x++; \n"
" throw new Error('again'); \n" // This is the new uncaught error.
"} \n";
TryRunJS(throw_again);
EXPECT_TRUE(try_catch.HasCaught());
Local<Message> message = try_catch.Message();
EXPECT_TRUE(!message.IsEmpty());
EXPECT_EQ(6, message->GetLineNumber(context).FromJust());
}
}
// Test that a try-finally block doesn't shadow a try-catch block
// when setting up an external handler.
//
// BUG(271): Some of the exception propagation does not work on the
// ARM simulator because the simulator separates the C++ stack and the
// JS stack. This test therefore fails on the simulator. The test is
// not threaded to allow the threading tests to run on the simulator.
TEST_F(APIExceptionTest, TryCatchInTryFinally) {
v8::HandleScope scope(isolate());
Local<ObjectTemplate> templ = ObjectTemplate::New(isolate());
templ->Set(isolate(), "CCatcher",
v8::FunctionTemplate::New(isolate(), CCatcher));
Local<Context> context = Context::New(isolate(), nullptr, templ);
v8::Context::Scope context_scope(context);
Local<Value> result = RunJS(
"try {"
" try {"
" CCatcher('throw 7;');"
" } finally {"
" }"
"} catch (e) {"
"}");
EXPECT_TRUE(result->IsTrue());
}
TEST_F(APIExceptionTest, TryCatchFinallyStoresMessageUsingTryCatchHandler) {
v8::HandleScope scope(isolate());
Local<ObjectTemplate> templ = ObjectTemplate::New(isolate());
templ->Set(isolate(), "CEvaluate",
v8::FunctionTemplate::New(isolate(), CEvaluate));
Local<Context> context = Context::New(isolate(), nullptr, templ);
v8::Context::Scope context_scope(context);
v8::TryCatch try_catch(isolate());
TryRunJS(
"try {"
" CEvaluate('throw 1;');"
"} finally {"
"}");
EXPECT_TRUE(try_catch.HasCaught());
EXPECT_TRUE(!try_catch.Message().IsEmpty());
String::Utf8Value exception_value(isolate(), try_catch.Exception());
EXPECT_EQ(0, strcmp(*exception_value, "1"));
try_catch.Reset();
TryRunJS(
"try {"
" CEvaluate('throw 1;');"
"} finally {"
" throw 2;"
"}");
EXPECT_TRUE(try_catch.HasCaught());
EXPECT_TRUE(!try_catch.Message().IsEmpty());
String::Utf8Value finally_exception_value(isolate(), try_catch.Exception());
EXPECT_EQ(0, strcmp(*finally_exception_value, "2"));
}
} // namespace
} // namespace v8
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