Profiler directed clean-up of dex2oat.

Fix bad usage of std::string in: the verifier and compiler driver method
arguments, causing unnecessary boxing and allocations; in creating a symbol for
the dex compilation unit, that is only used in portable builds; in pattern
matching for intrinsics by name.

Make class linker dex and classes locks reader/writer to allow concurrent
dex cache or class querying. Refactor ComputeCompilingMethodsClass to pass in a
dex cache hint, to avoid taking any locks when the dex file of the compiling
method matches that of the field or method being resolved.

Make the RegType's HasClass method virtual to avoid frequent virtual method
dispatch. Make RegTypeCache GetFromId inlinable.

Various other bits of whitespace and formatting clean-up.

Change-Id: Id152e1e5a6fed2961dad0b612b7aa0c48001ef94

1 files changed, 16 insertions, 5 deletions

diff --git a/src/compiler/driver/compiler_driver.cc b/src/compiler/driver/compiler_driver.cc
index 85dcdf671b..cc65cbee67 100644
--- a/src/compiler/driver/compiler_driver.cc
+++ b/src/compiler/driver/compiler_driver.cc
@@ -500,7 +500,7 @@ void CompilerDriver::PreCompile(jobject class_loader, const std::vector<const De
   InitializeClasses(class_loader, dex_files, thread_pool, timings);
 }
 
-bool CompilerDriver::IsImageClass(const std::string& descriptor) const {
+bool CompilerDriver::IsImageClass(const char* descriptor) const {
   if (image_classes_ == NULL) {
     return false;
   }
@@ -610,9 +610,14 @@ bool CompilerDriver::CanAccessInstantiableTypeWithoutChecks(uint32_t referrer_id
 }
 
 static mirror::Class* ComputeCompilingMethodsClass(ScopedObjectAccess& soa,
+                                                   mirror::DexCache* dex_cache,
                                                    const DexCompilationUnit* mUnit)
     SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
-  mirror::DexCache* dex_cache = mUnit->GetClassLinker()->FindDexCache(*mUnit->GetDexFile());
+  // The passed dex_cache is a hint, sanity check before asking the class linker that will take a
+  // lock.
+  if (dex_cache->GetDexFile() != mUnit->GetDexFile()) {
+    dex_cache = mUnit->GetClassLinker()->FindDexCache(*mUnit->GetDexFile());
+  }
   mirror::ClassLoader* class_loader = soa.Decode<mirror::ClassLoader*>(mUnit->GetClassLoader());
   const DexFile::MethodId& referrer_method_id = mUnit->GetDexFile()->GetMethodId(mUnit->GetDexMethodIndex());
   return mUnit->GetClassLinker()->ResolveType(*mUnit->GetDexFile(), referrer_method_id.class_idx_,
@@ -649,7 +654,9 @@ bool CompilerDriver::ComputeInstanceFieldInfo(uint32_t field_idx, const DexCompi
   // Try to resolve field and ignore if an Incompatible Class Change Error (ie is static).
   mirror::Field* resolved_field = ComputeFieldReferencedFromCompilingMethod(soa, mUnit, field_idx);
   if (resolved_field != NULL && !resolved_field->IsStatic()) {
-    mirror::Class* referrer_class = ComputeCompilingMethodsClass(soa, mUnit);
+    mirror::Class* referrer_class =
+        ComputeCompilingMethodsClass(soa, resolved_field->GetDeclaringClass()->GetDexCache(),
+                                     mUnit);
     if (referrer_class != NULL) {
       mirror::Class* fields_class = resolved_field->GetDeclaringClass();
       bool access_ok = referrer_class->CanAccess(fields_class) &&
@@ -698,7 +705,9 @@ bool CompilerDriver::ComputeStaticFieldInfo(uint32_t field_idx, const DexCompila
   // Try to resolve field and ignore if an Incompatible Class Change Error (ie isn't static).
   mirror::Field* resolved_field = ComputeFieldReferencedFromCompilingMethod(soa, mUnit, field_idx);
   if (resolved_field != NULL && resolved_field->IsStatic()) {
-    mirror::Class* referrer_class = ComputeCompilingMethodsClass(soa, mUnit);
+    mirror::Class* referrer_class =
+        ComputeCompilingMethodsClass(soa, resolved_field->GetDeclaringClass()->GetDexCache(),
+                                     mUnit);
     if (referrer_class != NULL) {
       mirror::Class* fields_class = resolved_field->GetDeclaringClass();
       if (fields_class == referrer_class) {
@@ -842,7 +851,9 @@ bool CompilerDriver::ComputeInvokeInfo(const DexCompilationUnit* mUnit, const ui
   if (resolved_method != NULL) {
     // Don't try to fast-path if we don't understand the caller's class or this appears to be an
     // Incompatible Class Change Error.
-    mirror::Class* referrer_class = ComputeCompilingMethodsClass(soa, mUnit);
+    mirror::Class* referrer_class =
+        ComputeCompilingMethodsClass(soa, resolved_method->GetDeclaringClass()->GetDexCache(),
+                                     mUnit);
     bool icce = resolved_method->CheckIncompatibleClassChange(invoke_type);
     if (referrer_class != NULL && !icce) {
       mirror::Class* methods_class = resolved_method->GetDeclaringClass();