size_t delete_methods(
std::vector<DexClass*>& scope, std::unordered_set<DexMethod*>& removable,
std::function<DexMethod*(DexMethod*, MethodSearch search)> resolver) {
// if a removable candidate is invoked do not delete
walk_opcodes(scope, [](DexMethod* meth) { return true; },
[&](DexMethod* meth, DexInstruction* insn) {
if (is_invoke(insn->opcode())) {
const auto mop = static_cast<DexOpcodeMethod*>(insn);
auto callee = resolver(mop->get_method(), opcode_to_search(insn));
if (callee != nullptr) {
removable.erase(callee);
}
}
});
size_t deleted = 0;
for (auto callee : removable) {
if (!callee->is_concrete()) continue;
if (do_not_strip(callee)) continue;
auto cls = type_class(callee->get_class());
always_assert_log(cls != nullptr,
"%s is concrete but does not have a DexClass\n",
SHOW(callee));
if (callee->is_virtual()) {
cls->get_vmethods().remove(callee);
} else {
cls->get_dmethods().remove(callee);
}
deleted++;
TRACE(DELMET, 4, "removing %s\n", SHOW(callee));
}
return deleted;
}
void delete_unused_bridgees() {
for (auto bpair : m_bridges_to_bridgees) {
auto bridge = bpair.first;
auto bridgee = bpair.second;
always_assert_log(bridge->is_virtual(),
"bridge: %s\nbridgee: %s",
SHOW(bridge),
SHOW(bridgee));
// TODO: Bridgee won't necessarily be direct once we expand this
// optimization
assert(!bridgee->is_virtual());
auto cls = type_class(bridgee->get_class());
cls->get_dmethods().remove(bridgee);
}
}
void StaticSinkPass::run_pass(DexClassesVector& dexen, ConfigFiles& cfg) {
auto method_list = cfg.get_coldstart_methods();
auto methods = strings_to_dexmethods(method_list);
TRACE(SINK, 1, "methods used in coldstart: %lu\n", methods.size());
auto coldstart_classes = get_coldstart_classes(dexen, cfg);
count_coldstart_statics(coldstart_classes);
auto statics = get_noncoldstart_statics(coldstart_classes, methods);
TRACE(SINK, 1, "statics not used in coldstart: %lu\n", statics.size());
remove_primary_dex_refs(dexen[0], statics);
TRACE(SINK, 1, "statics after removing primary dex: %lu\n", statics.size());
auto sink_map = get_sink_map(dexen, coldstart_classes, statics);
TRACE(SINK, 1, "statics with sinkable callsite: %lu\n", sink_map.size());
auto holder = move_statics_out(statics, sink_map);
TRACE(SINK, 1, "methods in static holder: %lu\n",
holder->get_dmethods().size());
DexClasses dc(1);
dc.insert_at(holder, 0);
dexen.emplace_back(std::move(dc));
}
TEST_F(PreVerify, InlineInvokeDirect) {
auto cls = find_class_named(
classes, "Lcom/facebook/redexinline/InlineTest;");
auto m = find_vmethod_named(*cls, "testInlineInvokeDirect");
auto invoke =
find_invoke(m, OPCODE_INVOKE_DIRECT, "hasNoninlinableInvokeDirect");
auto noninlinable_invoke_direct =
find_invoke(invoke->get_method(), OPCODE_INVOKE_DIRECT, "noninlinable");
auto noninlinable = noninlinable_invoke_direct->get_method();
ASSERT_EQ(show(noninlinable->get_proto()), "()V");
// verify that there are two inlinable() methods in the class. The static
// version exists to test that we don't cause a signature collision when we
// make the instance method static.
auto dmethods = cls->get_dmethods();
ASSERT_EQ(2,
std::count_if(dmethods.begin(), dmethods.end(), [](DexMethod* m) {
return !strcmp("noninlinable", m->get_name()->c_str());
}));
}
TEST_F(PostVerify, InlineInvokeDirect) {
auto cls = find_class_named(
classes, "Lcom/facebook/redexinline/InlineTest;");
auto m = find_vmethod_named(*cls, "testInlineInvokeDirect");
auto noninlinable_invoke_direct =
find_invoke(m, OPCODE_INVOKE_STATIC, "noninlinable$redex0");
ASSERT_NE(nullptr, noninlinable_invoke_direct);
auto noninlinable = noninlinable_invoke_direct->get_method();
ASSERT_EQ(show(noninlinable->get_proto()),
"(Lcom/facebook/redexinline/InlineTest;)V");
auto dmethods = cls->get_dmethods();
// verify that we've replaced the instance noninlinable() method with
// noninlinable$redex
ASSERT_EQ(1,
std::count_if(dmethods.begin(), dmethods.end(), [](DexMethod* m) {
return !strcmp("noninlinable", m->get_name()->c_str());
}));
ASSERT_EQ(1,
std::count_if(dmethods.begin(), dmethods.end(), [](DexMethod* m) {
return !strcmp("noninlinable$redex0", m->get_name()->c_str());
}));
}
void RemoveBuildersPass::run_pass(DexStoresVector& stores,
ConfigFiles&,
PassManager& mgr) {
if (mgr.no_proguard_rules()) {
TRACE(BUILDERS,
1,
"RemoveBuildersPass did not run because no Proguard configuration "
"was provided.");
return;
}
// Initialize couters.
b_counter = {0, 0, 0, 0};
auto obj_type = get_object_type();
auto scope = build_class_scope(stores);
for (DexClass* cls : scope) {
if (is_annotation(cls) || is_interface(cls) ||
cls->get_super_class() != obj_type) {
continue;
}
if (has_builder_name(cls->get_type())) {
m_builders.emplace(cls->get_type());
}
}
std::unordered_set<DexType*> escaped_builders;
walk::methods(scope, [&](DexMethod* m) {
auto builders = created_builders(m);
for (DexType* builder : builders) {
if (escapes_stack(builder, m)) {
TRACE(BUILDERS,
3,
"%s escapes in %s\n",
SHOW(builder),
m->get_deobfuscated_name().c_str());
escaped_builders.emplace(builder);
}
}
});
std::unordered_set<DexType*> stack_only_builders;
for (DexType* builder : m_builders) {
if (escaped_builders.find(builder) == escaped_builders.end()) {
stack_only_builders.emplace(builder);
}
}
std::unordered_set<DexType*> builders_and_supers;
for (DexType* builder : stack_only_builders) {
DexType* cls = builder;
while (cls != nullptr && cls != obj_type) {
builders_and_supers.emplace(cls);
cls = type_class(cls)->get_super_class();
}
}
std::unordered_set<DexType*> this_escapes;
for (DexType* cls_ty : builders_and_supers) {
DexClass* cls = type_class(cls_ty);
if (cls->is_external() ||
this_arg_escapes(cls, m_enable_buildee_constr_change)) {
this_escapes.emplace(cls_ty);
}
}
// set of builders that neither escape the stack nor pass their 'this' arg
// to another function
std::unordered_set<DexType*> no_escapes;
for (DexType* builder : stack_only_builders) {
DexType* cls = builder;
bool hierarchy_has_escape = false;
while (cls != nullptr) {
if (this_escapes.find(cls) != this_escapes.end()) {
hierarchy_has_escape = true;
break;
}
cls = type_class(cls)->get_super_class();
}
if (!hierarchy_has_escape) {
no_escapes.emplace(builder);
}
}
size_t dmethod_count = 0;
size_t vmethod_count = 0;
size_t build_count = 0;
for (DexType* builder : no_escapes) {
auto cls = type_class(builder);
auto buildee = get_buildee(builder);
dmethod_count += cls->get_dmethods().size();
vmethod_count += cls->get_vmethods().size();
for (DexMethod* m : cls->get_vmethods()) {
if (m->get_proto()->get_rtype() == buildee) {
build_count++;
}
}
}
std::unordered_set<DexClass*> trivial_builders =
get_trivial_builders(m_builders, no_escapes);
std::unordered_set<DexClass*> kept_builders =
get_builders_with_subclasses(scope);
PassConfig pc(mgr.get_config());
BuilderTransform b_transform(pc, scope, stores, false);
// Inline non init methods.
std::unordered_set<DexClass*> removed_builders;
walk::methods(scope, [&](DexMethod* method) {
auto builders = created_builders(method);
for (DexType* builder : builders) {
if (method->get_class() == builder) {
continue;
}
DexClass* builder_cls = type_class(builder);
// Filter out builders that we cannot remove.
if (kept_builders.find(builder_cls) != kept_builders.end()) {
continue;
}
// Check it is a trivial one.
if (trivial_builders.find(builder_cls) != trivial_builders.end()) {
DexMethod* method_copy = DexMethod::make_method_from(
method,
method->get_class(),
DexString::make_string(method->get_name()->str() +
"$redex_builders"));
bool was_not_removed =
!b_transform.inline_methods(
method, builder, &get_non_init_methods) ||
!remove_builder_from(method, builder_cls, b_transform);
if (was_not_removed) {
kept_builders.emplace(builder_cls);
method->set_code(method_copy->release_code());
} else {
b_counter.methods_cleared++;
removed_builders.emplace(builder_cls);
}
DexMethod::erase_method(method_copy);
}
}
});
// No need to remove the builders here, since `RemoveUnreachable` will
// take care of it.
gather_removal_builder_stats(removed_builders, kept_builders);
mgr.set_metric("total_builders", m_builders.size());
mgr.set_metric("stack_only_builders", stack_only_builders.size());
mgr.set_metric("no_escapes", no_escapes.size());
mgr.incr_metric(METRIC_CLASSES_REMOVED, b_counter.classes_removed);
mgr.incr_metric(METRIC_METHODS_REMOVED, b_counter.methods_removed);
mgr.incr_metric(METRIC_FIELDS_REMOVED, b_counter.fields_removed);
mgr.incr_metric(METRIC_METHODS_CLEARED, b_counter.methods_cleared);
TRACE(BUILDERS, 1, "Total builders: %d\n", m_builders.size());
TRACE(BUILDERS, 1, "Stack-only builders: %d\n", stack_only_builders.size());
TRACE(BUILDERS,
1,
"Stack-only builders that don't let `this` escape: %d\n",
no_escapes.size());
TRACE(BUILDERS, 1, "Stats for unescaping builders:\n");
TRACE(BUILDERS, 1, "\tdmethods: %d\n", dmethod_count);
TRACE(BUILDERS, 1, "\tvmethods: %d\n", vmethod_count);
TRACE(BUILDERS, 1, "\tbuild methods: %d\n", build_count);
TRACE(BUILDERS, 1, "Trivial builders: %d\n", trivial_builders.size());
TRACE(BUILDERS, 1, "Classes removed: %d\n", b_counter.classes_removed);
TRACE(BUILDERS, 1, "Methods removed: %d\n", b_counter.methods_removed);
TRACE(BUILDERS, 1, "Fields removed: %d\n", b_counter.fields_removed);
TRACE(BUILDERS, 1, "Methods cleared: %d\n", b_counter.methods_cleared);
}
