Use direct class pointers at allocation sites in the compiled code.
- Rather than looking up a class from its type ID (and checking if
it's resolved/initialized, resolving/initializing if not), use
direct class pointers, if possible (boot-code-to-boot-class pointers
and app-code-to-boot-class pointers.)
- This results in a 1-2% speedup in Ritz MemAllocTest on Nexus 4.
- Embedding the object size (along with class pointers) caused a 1-2%
slowdown in MemAllocTest and isn't implemented in this change.
- TODO: do the same for array allocations.
- TODO: when/if an application gets its own image, implement
app-code-to-app-class pointers.
- Fix a -XX:gc bug.
cf. https://android-review.googlesource.com/79460/
- Add /tmp/android-data/dalvik-cache to the list of locations to
remove oat files in clean-oat-host.
cf. https://android-review.googlesource.com/79550
- Add back a dropped UNLIKELY in FindMethodFromCode().
cf. https://android-review.googlesource.com/74205
Bug: 9986565
Change-Id: I590b96bd21f7a7472f88e36752e675547559a5b1
diff --git a/compiler/driver/compiler_driver.cc b/compiler/driver/compiler_driver.cc
index f713151..f390b41 100644
--- a/compiler/driver/compiler_driver.cc
+++ b/compiler/driver/compiler_driver.cc
@@ -439,6 +439,10 @@
MutexLock mu(self, compiled_methods_lock_);
STLDeleteElements(&methods_to_patch_);
}
+ {
+ MutexLock mu(self, compiled_methods_lock_);
+ STLDeleteElements(&classes_to_patch_);
+ }
CHECK_PTHREAD_CALL(pthread_key_delete, (tls_key_), "delete tls key");
typedef void (*UninitCompilerContextFn)(CompilerDriver&);
UninitCompilerContextFn uninit_compiler_context;
@@ -906,6 +910,51 @@
return result;
}
+bool CompilerDriver::CanEmbedTypeInCode(const DexFile& dex_file, uint32_t type_idx,
+ bool* is_type_initialized, bool* use_direct_type_ptr,
+ uintptr_t* direct_type_ptr) {
+ ScopedObjectAccess soa(Thread::Current());
+ mirror::DexCache* dex_cache = Runtime::Current()->GetClassLinker()->FindDexCache(dex_file);
+ mirror::Class* resolved_class = dex_cache->GetResolvedType(type_idx);
+ if (resolved_class == nullptr) {
+ return false;
+ }
+ const bool compiling_boot = Runtime::Current()->GetHeap()->IsCompilingBoot();
+ if (compiling_boot) {
+ // boot -> boot class pointers.
+ // True if the class is in the image at boot compiling time.
+ const bool is_image_class = IsImage() && IsImageClass(
+ dex_file.StringDataByIdx(dex_file.GetTypeId(type_idx).descriptor_idx_));
+ // True if pc relative load works.
+ const bool support_boot_image_fixup = GetSupportBootImageFixup();
+ if (is_image_class && support_boot_image_fixup) {
+ *is_type_initialized = resolved_class->IsInitialized();
+ *use_direct_type_ptr = false;
+ *direct_type_ptr = 0;
+ return true;
+ } else {
+ return false;
+ }
+ } else {
+ // True if the class is in the image at app compiling time.
+ const bool class_in_image =
+ Runtime::Current()->GetHeap()->FindSpaceFromObject(resolved_class, false)->IsImageSpace();
+ if (class_in_image) {
+ // boot -> app class pointers.
+ *is_type_initialized = resolved_class->IsInitialized();
+ *use_direct_type_ptr = true;
+ *direct_type_ptr = reinterpret_cast<uintptr_t>(resolved_class);
+ return true;
+ } else {
+ // app -> app class pointers.
+ // Give up because app does not have an image and class
+ // isn't created at compile time. TODO: implement this
+ // if/when each app gets an image.
+ return false;
+ }
+ }
+}
+
static mirror::Class* ComputeCompilingMethodsClass(ScopedObjectAccess& soa,
SirtRef<mirror::DexCache>& dex_cache,
const DexCompilationUnit* mUnit)
@@ -1291,13 +1340,13 @@
InvokeType target_invoke_type,
size_t literal_offset) {
MutexLock mu(Thread::Current(), compiled_methods_lock_);
- code_to_patch_.push_back(new PatchInformation(dex_file,
- referrer_class_def_idx,
- referrer_method_idx,
- referrer_invoke_type,
- target_method_idx,
- target_invoke_type,
- literal_offset));
+ code_to_patch_.push_back(new CallPatchInformation(dex_file,
+ referrer_class_def_idx,
+ referrer_method_idx,
+ referrer_invoke_type,
+ target_method_idx,
+ target_invoke_type,
+ literal_offset));
}
void CompilerDriver::AddMethodPatch(const DexFile* dex_file,
uint16_t referrer_class_def_idx,
@@ -1307,13 +1356,25 @@
InvokeType target_invoke_type,
size_t literal_offset) {
MutexLock mu(Thread::Current(), compiled_methods_lock_);
- methods_to_patch_.push_back(new PatchInformation(dex_file,
- referrer_class_def_idx,
- referrer_method_idx,
- referrer_invoke_type,
- target_method_idx,
- target_invoke_type,
- literal_offset));
+ methods_to_patch_.push_back(new CallPatchInformation(dex_file,
+ referrer_class_def_idx,
+ referrer_method_idx,
+ referrer_invoke_type,
+ target_method_idx,
+ target_invoke_type,
+ literal_offset));
+}
+void CompilerDriver::AddClassPatch(const DexFile* dex_file,
+ uint16_t referrer_class_def_idx,
+ uint32_t referrer_method_idx,
+ uint32_t target_type_idx,
+ size_t literal_offset) {
+ MutexLock mu(Thread::Current(), compiled_methods_lock_);
+ classes_to_patch_.push_back(new TypePatchInformation(dex_file,
+ referrer_class_def_idx,
+ referrer_method_idx,
+ target_type_idx,
+ literal_offset));
}
class ParallelCompilationManager {