Compile time performance improvements focusing on interpret-only.

Reduce virtual method dispatch in the method verifier and make more code
inline-able.
Add a StringPiece with const char* equality operator to avoid redundant
StringPieces and strlens.
Remove back link from register line to verifier and pass as argument to reduce
size of RegisterLine.
Remove instruction length from instruction flags and compute from the
instruction, again to reduce size.
Add suspend checks to resolve and verify to allow for more easy monitor
inflation and reduce contention on Locks::thread_list_suspend_thread_lock_.
Change ThrowEarlierClassFailure to throw pre-allocated exception.
Avoid calls to Thread::Current() by passing self.
Template specialize IsValidClassName.
Make ANR reporting with SIGQUIT run using checkpoints rather than suspending
all threads. This makes the stack/lock analysis less lock error prone.
Extra Barrier assertions and condition variable time out is now returned as a
boolean both from Barrier and ConditionVariable::Wait.

2 threaded host x86-64 interpret-only numbers from 341 samples:
Before change: Avg 176.137ms 99% CI 3.468ms to 1060.770ms
After change: Avg 139.163% 99% CI 3.027ms to 838.257ms
Reduction in average compile time after change is 20.9%.
Slow-down without change is 26.5%.

Bug: 17471626 - Fix bug where RegTypeCache::JavaLangObject/String/Class/Throwable
could return unresolved type when class loading is disabled.
Bug: 17398101

Change-Id: Id59ce3cc520701c6ecf612f7152498107bc40684

1 files changed, 21 insertions, 0 deletions

diff --git a/runtime/thread-inl.h b/runtime/thread-inl.h
index bd399e7..6698634 100644
--- a/runtime/thread-inl.h
+++ b/runtime/thread-inl.h
@@ -23,6 +23,7 @@
 
 #include "base/casts.h"
 #include "base/mutex-inl.h"
+#include "entrypoints/entrypoint_utils-inl.h"
 #include "gc/heap.h"
 #include "jni_env_ext.h"
 
@@ -45,6 +46,26 @@ inline Thread* Thread::Current() {
   }
 }
 
+inline void Thread::AllowThreadSuspension() {
+  DCHECK_EQ(Thread::Current(), this);
+  if (UNLIKELY(TestAllFlags())) {
+    CheckSuspend();
+  }
+}
+
+inline void Thread::CheckSuspend() {
+  DCHECK_EQ(Thread::Current(), this);
+  for (;;) {
+    if (ReadFlag(kCheckpointRequest)) {
+      RunCheckpointFunction();
+    } else if (ReadFlag(kSuspendRequest)) {
+      FullSuspendCheck();
+    } else {
+      break;
+    }
+  }
+}
+
 inline ThreadState Thread::SetState(ThreadState new_state) {
   // Cannot use this code to change into Runnable as changing to Runnable should fail if
   // old_state_and_flags.suspend_request is true.