Change ClassStatus to fit into 4 bits.

In preparation for extending the type check bit string from
24 to 28 bits, rewrite ClassStatus to fit into 4 bits. Also
perform a proper cleanup of the ClassStatus, i.e. change it
to an enum class, remove the "Status" word from enumerator
names, replace "Max" with "Last" in line with other
enumerations and remove aliases from mirror::Class.

Test: m test-art-host-gtest
Test: testrunner.py --host --optimizing
Test: Pixel 2 XL boots.
Test: testrunner.py --target --optimizing
Bug: 64692057
Bug: 65318848
Change-Id: Iec1610ba5dac2c527b36c12819f132e1a77f2d45

1 files changed, 3 insertions, 3 deletions

diff --git a/compiler/optimizing/code_generator_mips.cc b/compiler/optimizing/code_generator_mips.cc
index c4772ad79f..ebe252a9c8 100644
--- a/compiler/optimizing/code_generator_mips.cc
+++ b/compiler/optimizing/code_generator_mips.cc
@@ -1915,9 +1915,9 @@ void CodeGeneratorMIPS::GenerateInvokeRuntime(int32_t entry_point_offset, bool d
 
 void InstructionCodeGeneratorMIPS::GenerateClassInitializationCheck(SlowPathCodeMIPS* slow_path,
                                                                     Register class_reg) {
-  __ LoadFromOffset(kLoadSignedByte, TMP, class_reg, mirror::Class::StatusOffset().Int32Value());
-  __ LoadConst32(AT, mirror::Class::kStatusInitialized);
-  __ Blt(TMP, AT, slow_path->GetEntryLabel());
+  __ LoadFromOffset(kLoadUnsignedByte, TMP, class_reg, mirror::Class::StatusOffset().Int32Value());
+  __ LoadConst32(AT, enum_cast<>(ClassStatus::kInitialized));
+  __ Bltu(TMP, AT, slow_path->GetEntryLabel());
   // Even if the initialized flag is set, we need to ensure consistent memory ordering.
   __ Sync(0);
   __ Bind(slow_path->GetExitLabel());