Add JIT

Currently disabled by default unless -Xjit is passed in.

The proposed JIT is a method JIT which works by utilizing interpreter
instrumentation to request compilation of hot methods async during
runtime.

JIT options:
-Xjit / -Xnojit
-Xjitcodecachesize:N
-Xjitthreshold:integervalue

The JIT has a shared copy of a compiler driver which is accessed
by worker threads to compile individual methods.

Added JIT code cache and data cache, currently sized at 2 MB
capacity by default. Most apps will only fill a small fraction of
this cache however.

Added support to the compiler for compiling interpreter quickened
byte codes.

Added test target ART_TEST_JIT=TRUE and --jit for run-test.

TODO:
Clean up code cache.
Delete compiled methods after they are added to code cache.
Add more optimizations related to runtime checks e.g. direct pointers
for invokes.
Add method recompilation.
Move instrumentation to DexFile to improve performance and reduce
memory usage.

Bug: 17950037

Change-Id: Ifa5b2684a2d5059ec5a5210733900aafa3c51bca

1 files changed, 76 insertions, 0 deletions

diff --git a/compiler/jit/jit_compiler.h b/compiler/jit/jit_compiler.h
new file mode 100644
index 0000000000..08764991ea
--- /dev/null
+++ b/compiler/jit/jit_compiler.h
@@ -0,0 +1,76 @@
+/*
+ * Copyright 2015 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ART_COMPILER_JIT_JIT_COMPILER_H_
+#define ART_COMPILER_JIT_JIT_COMPILER_H_
+
+#include "base/mutex.h"
+#include "compiler_callbacks.h"
+#include "compiled_method.h"
+#include "dex/verification_results.h"
+#include "dex/quick/dex_file_to_method_inliner_map.h"
+#include "driver/compiler_driver.h"
+#include "driver/compiler_options.h"
+#include "oat_file.h"
+
+namespace art {
+
+class InstructionSetFeatures;
+
+namespace mirror {
+class ArtMethod;
+}
+
+namespace jit {
+
+class JitCompiler {
+ public:
+  static JitCompiler* Create();
+  virtual ~JitCompiler();
+  bool CompileMethod(Thread* self, mirror::ArtMethod* method)
+      SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
+  // This is in the compiler since the runtime doesn't have access to the compiled method
+  // structures.
+  bool AddToCodeCache(mirror::ArtMethod* method, const CompiledMethod* compiled_method,
+                      OatFile::OatMethod* out_method) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
+  CompilerCallbacks* GetCompilerCallbacks() const;
+  size_t GetTotalCompileTime() const {
+    return total_time_;
+  }
+
+ private:
+  uint64_t total_time_;
+  std::unique_ptr<CompilerOptions> compiler_options_;
+  std::unique_ptr<CumulativeLogger> cumulative_logger_;
+  std::unique_ptr<VerificationResults> verification_results_;
+  std::unique_ptr<DexFileToMethodInlinerMap> method_inliner_map_;
+  std::unique_ptr<CompilerCallbacks> callbacks_;
+  std::unique_ptr<CompilerDriver> compiler_driver_;
+  std::unique_ptr<const InstructionSetFeatures> instruction_set_features_;
+
+  explicit JitCompiler();
+  uint8_t* WriteMethodHeaderAndCode(
+      const CompiledMethod* compiled_method, uint8_t* reserve_begin, uint8_t* reserve_end,
+      const uint8_t* mapping_table, const uint8_t* vmap_table, const uint8_t* gc_map);
+  bool MakeExecutable(CompiledMethod* compiled_method, mirror::ArtMethod* method)
+      SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
+};
+
+}  // namespace jit
+
+}  // namespace art
+
+#endif  // ART_COMPILER_JIT_JIT_COMPILER_H_