blob: 0aef5ab87668c579be56d8bd6f3f65bd2d41d17d [file] [log] [blame]
// Copyright (c) 2012 The Chromium 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 "ppapi/tests/test_instance_deprecated.h"
#include <assert.h>
#include "ppapi/c/ppb_var.h"
#include "ppapi/cpp/module.h"
#include "ppapi/tests/testing_instance.h"
static const char kSetValueFunction[] = "SetValue";
static const char kSetExceptionFunction[] = "SetException";
static const char kReturnValueFunction[] = "ReturnValue";
InstanceSO::InstanceSO(TestInstance* i)
: test_instance_(i),
testing_interface_(i->testing_interface()) {
InstanceSO::~InstanceSO() {
if (test_instance_)
bool InstanceSO::HasMethod(const pp::Var& name, pp::Var* exception) {
if (!name.is_string())
return false;
return name.AsString() == kSetValueFunction ||
name.AsString() == kSetExceptionFunction ||
name.AsString() == kReturnValueFunction;
pp::Var InstanceSO::Call(const pp::Var& method_name,
const std::vector<pp::Var>& args,
pp::Var* exception) {
if (!method_name.is_string())
return false;
std::string name = method_name.AsString();
if (name == kSetValueFunction) {
if (args.size() != 1 || !args[0].is_string())
*exception = pp::Var("Bad argument to SetValue(<string>)");
else if (test_instance_)
} else if (name == kSetExceptionFunction) {
if (args.size() != 1 || !args[0].is_string())
*exception = pp::Var("Bad argument to SetException(<string>)");
*exception = args[0];
} else if (name == kReturnValueFunction) {
if (args.size() != 1)
*exception = pp::Var("Need single arg to call ReturnValue");
return args[0];
} else {
*exception = pp::Var("Bad function call");
return pp::Var();
TestInstance::TestInstance(TestingInstance* instance)
: TestCase(instance),
instance_so_(NULL) {}
bool TestInstance::Init() {
return true;
TestInstance::~TestInstance() {
if (testing_interface_->IsOutOfProcess() == PP_FALSE) {
// This should cause the instance object's destructor to be called.
// Test a post-condition which ensures the instance objects destructor is
// called. This only works reliably in-process. Out-of-process, it only
// can work when the renderer stays alive a short while after the plugin
// instance is destroyed. If the renderer is being shut down, too much
// happens asynchronously for the out-of-process case to work reliably. In
// particular:
// - The Var ReleaseObject message is asynchronous.
// - The PPB_Var_Deprecated host-side proxy posts a task to actually
// release the object when the ReleaseObject message is received.
// - The PPP_Class Deallocate message is asynchronous.
// At time of writing this comment, if you modify the code so that the above
// happens synchronously, and you remove the restriction that the plugin
// can't be unblocked by a sync message, then this check actually passes
// reliably for out-of-process. But we don't want to make any of those
// changes so we just skip the check.
} else {
// Out-of-process, this destructor might not actually get invoked. Clear
// the InstanceSOs reference to the instance so there is no UAF.
if (instance_so_)
// Save the fact that we were destroyed in sessionStorage. This tests that
// we can ExecuteScript at instance destruction without crashing. It also
// allows us to check that ExecuteScript will run and succeed in certain
// cases. In particular, when the instance is destroyed by normal DOM
// deletion, ExecuteScript will actually work. See
// TestExecuteScriptInInstanceShutdown for that test. Note, however, that
// ExecuteScript will *not* have an effect when the instance is destroyed
// because the renderer was shut down.
pp::Var ret = instance()->ExecuteScript(
"sessionStorage.setItem('instance_destroyed', 'true');");
void TestInstance::RunTests(const std::string& filter) {
RUN_TEST(ExecuteScript, filter);
RUN_TEST(RecursiveObjects, filter);
RUN_TEST(LeakedObjectDestructors, filter);
RUN_TEST(SetupExecuteScriptAtInstanceShutdown, filter);
RUN_TEST(ExecuteScriptAtInstanceShutdown, filter);
void TestInstance::LeakReferenceAndIgnore(const pp::Var& leaked) {
static const PPB_Var* var_interface = static_cast<const PPB_Var*>(
pp::deprecated::ScriptableObject* TestInstance::CreateTestObject() {
if (!instance_so_)
instance_so_ = new InstanceSO(this);
return instance_so_;
std::string TestInstance::TestExecuteScript() {
// Simple call back into the plugin.
pp::Var exception;
pp::Var ret = instance_->ExecuteScript(
"document.getElementById('plugin').SetValue('hello, world');",
ASSERT_TRUE(string_ == "hello, world");
// Return values from the plugin should be returned.
ret = instance_->ExecuteScript(
"document.getElementById('plugin').ReturnValue('return value');",
ASSERT_TRUE(ret.is_string() && ret.AsString() == "return value");
// Exception thrown by the plugin should be caught.
ret = instance_->ExecuteScript(
"document.getElementById('plugin').SetException('plugin exception');",
// Due to a limitation in the implementation of TryCatch, it doesn't actually
// pass the strings up. Since this is a trusted only interface, we've decided
// not to bother fixing this for now.
// Exception caused by string evaluation should be caught.
exception = pp::Var();
ret = instance_->ExecuteScript("document.doesntExist()", &exception);
ASSERT_TRUE(exception.is_string()); // Don't know exactly what it will say.
// A scriptable object that contains other scriptable objects recursively. This
// is used to help verify that our scriptable object clean-up code works
// properly.
class ObjectWithChildren : public pp::deprecated::ScriptableObject {
ObjectWithChildren(TestInstance* i, int num_descendents) {
if (num_descendents > 0) {
child_ = pp::VarPrivate(i->instance(),
new ObjectWithChildren(i, num_descendents - 1));
struct IgnoreLeaks {};
ObjectWithChildren(TestInstance* i, int num_descendents, IgnoreLeaks) {
if (num_descendents > 0) {
child_ = pp::VarPrivate(i->instance(),
new ObjectWithChildren(i, num_descendents - 1,
pp::VarPrivate child_;
std::string TestInstance::TestRecursiveObjects() {
const int kNumChildren = 20;
// These should be deleted when we exit scope, so should not leak.
pp::VarPrivate not_leaked(instance(), new ObjectWithChildren(this,
// We need to run the GC multiple times until all of the vars are released.
// Each GC invocation will result in releasing a var, which will result in its
// children not having any references, allowing them also to be collected.
for (int i = 0; i < kNumChildren; ++i)
// Leak some, but tell TestCase to ignore the leaks. This test is run and then
// reloaded (see If these aren't cleaned up when the first
// run is torn down, they will show up as leaks in the second run.
// NOTE: The ScriptableObjects are actually leaked, but they should be removed
// from the tracker. See below for a test that verifies that the
// destructor is not run.
pp::VarPrivate leaked(
new ObjectWithChildren(this, kNumChildren,
// Now leak a reference to the root object. This should force the root and
// all its descendents to stay in the tracker.
// A scriptable object that should cause a crash if its destructor is run. We
// don't run the destructor for objects which the plugin leaks. This is to
// prevent them doing dangerous things at cleanup time, such as executing script
// or creating new objects.
class BadDestructorObject : public pp::deprecated::ScriptableObject {
BadDestructorObject() {}
~BadDestructorObject() {
std::string TestInstance::TestLeakedObjectDestructors() {
pp::VarPrivate leaked(instance(), new BadDestructorObject());
// Leak a reference so it gets deleted on instance shutdown.
std::string TestInstance::TestSetupExecuteScriptAtInstanceShutdown() {
// This test only exists so that it can be run before
// TestExecuteScriptAtInstanceShutdown. See the comment for that test.
pp::Var exception;
pp::Var result = instance()->ExecuteScript(
"sessionStorage.removeItem('instance_destroyed');", &exception);
std::string TestInstance::TestExecuteScriptAtInstanceShutdown() {
// This test relies on the previous test being run in the same browser
// session, but in such a way that the instance is destroyed. See
// chrome/test/ppapi/ for how the navigation happens.
// Given those constraints, ~TestInstance should have been invoked to set
// instance_destroyed in sessionStorage. So all we have to do is make sure
// that it was set as expected.
pp::Var result = instance()->ExecuteScript(
ASSERT_EQ(std::string("true"), result.AsString());