commit 2d2621a1463d2f3f03fa73503fa42e43657cdcfc
author Mathieu Chartier <mathieuc@google.com> Thu Oct 23 16:48:06 2014 -0700
committer Mathieu Chartier <mathieuc@google.com> Mon Oct 27 16:49:43 2014 -0700
tree 1f7cf393693d72db5c186f99b04ac511958c6418
parent ac293277b69882105810fabd6c53f55de58823fe

Optimize method linking

Added more inlining, removed imt array allocation and replaced it
with a handle scope. Removed some un-necessary handle scopes.

Added logic to base interface method tables from the superclass so
that we dont need to reconstruct for every interface (large win).

Facebook launch Dalvik KK MR2:
TotalTime: 3165
TotalTime: 3652
TotalTime: 3143
TotalTime: 3298
TotalTime: 3212
TotalTime: 3211

Facebook launch TOT before:
WaitTime: 3702
WaitTime: 3616
WaitTime: 3616
WaitTime: 3687
WaitTime: 3742
WaitTime: 3767

After optimizations:
WaitTime: 2903
WaitTime: 2953
WaitTime: 2918
WaitTime: 2940
WaitTime: 2879
WaitTime: 2792

LinkInterfaceMethods no longer one of the hottest methods, new list:
4.73% art::ClassLinker::LinkVirtualMethods(art::Thread*, art::Handle<art::mirror::Class>)
3.07% art::DexFile::FindClassDef(char const*) const
2.94% art::mirror::Class::FindDeclaredStaticField(art::mirror::DexCache const*, unsigned int)
2.90% art::DexFile::FindStringId(char const*) const

Bug: 18054905
Bug: 16828525

(cherry picked from commit 1fb463e42cf1d67595cff66d19c0f99e3046f4c4)

Change-Id: I27cc70178fd3655fbe5a3178887fcba189d21321

compiler/image_writer.cc

diff --git a/compiler/image_writer.cc b/compiler/image_writer.cc
index 235aba8..7baae6e 100644
--- a/compiler/image_writer.cc
+++ b/compiler/image_writer.cc
@@ -454,6 +454,8 @@
       ObjectArray<Object>::Alloc(self, object_array_class.Get(), ImageHeader::kImageRootsMax)));
   image_roots->Set<false>(ImageHeader::kResolutionMethod, runtime->GetResolutionMethod());
   image_roots->Set<false>(ImageHeader::kImtConflictMethod, runtime->GetImtConflictMethod());
+  image_roots->Set<false>(ImageHeader::kImtUnimplementedMethod,
+                          runtime->GetImtUnimplementedMethod());
   image_roots->Set<false>(ImageHeader::kDefaultImt, runtime->GetDefaultImt());
   image_roots->Set<false>(ImageHeader::kCalleeSaveMethod,
                           runtime->GetCalleeSaveMethod(Runtime::kSaveAll));
@@ -690,7 +692,7 @@
 
 const uint8_t* ImageWriter::GetQuickCode(mirror::ArtMethod* method, bool* quick_is_interpreted) {
   DCHECK(!method->IsResolutionMethod() && !method->IsImtConflictMethod() &&
-         !method->IsAbstract()) << PrettyMethod(method);
+         !method->IsImtUnimplementedMethod() && !method->IsAbstract()) << PrettyMethod(method);
 
   // Use original code if it exists. Otherwise, set the code pointer to the resolution
   // trampoline.
@@ -721,9 +723,11 @@
 const uint8_t* ImageWriter::GetQuickEntryPoint(mirror::ArtMethod* method) {
   // Calculate the quick entry point following the same logic as FixupMethod() below.
   // The resolution method has a special trampoline to call.
-  if (UNLIKELY(method == Runtime::Current()->GetResolutionMethod())) {
+  Runtime* runtime = Runtime::Current();
+  if (UNLIKELY(method == runtime->GetResolutionMethod())) {
     return GetOatAddress(quick_resolution_trampoline_offset_);
-  } else if (UNLIKELY(method == Runtime::Current()->GetImtConflictMethod())) {
+  } else if (UNLIKELY(method == runtime->GetImtConflictMethod() ||
+                      method == runtime->GetImtUnimplementedMethod())) {
     return GetOatAddress(quick_imt_conflict_trampoline_offset_);
   } else {
     // We assume all methods have code. If they don't currently then we set them to the use the
@@ -743,10 +747,12 @@
   // oat_begin_
 
   // The resolution method has a special trampoline to call.
-  if (UNLIKELY(orig == Runtime::Current()->GetResolutionMethod())) {
+  Runtime* runtime = Runtime::Current();
+  if (UNLIKELY(orig == runtime->GetResolutionMethod())) {
     copy->SetEntryPointFromPortableCompiledCode<kVerifyNone>(GetOatAddress(portable_resolution_trampoline_offset_));
     copy->SetEntryPointFromQuickCompiledCode<kVerifyNone>(GetOatAddress(quick_resolution_trampoline_offset_));
-  } else if (UNLIKELY(orig == Runtime::Current()->GetImtConflictMethod())) {
+  } else if (UNLIKELY(orig == runtime->GetImtConflictMethod() ||
+                      orig == runtime->GetImtUnimplementedMethod())) {
     copy->SetEntryPointFromPortableCompiledCode<kVerifyNone>(GetOatAddress(portable_imt_conflict_trampoline_offset_));
     copy->SetEntryPointFromQuickCompiledCode<kVerifyNone>(GetOatAddress(quick_imt_conflict_trampoline_offset_));
   } else {