ART: Refactor intrinsics slow-paths

Refactor slow paths so that there is a default implementation for
common cases (only arm64 with vixl is special). Write a generic
intrinsic slow-path that can be reused for the specific architectures.
Move helper functions into CodeGenerator so that they are accessible.

Change-Id: Ibd788dce432601c6a9f7e6f13eab31f28dcb8550

1 files changed, 88 insertions, 0 deletions

diff --git a/compiler/optimizing/intrinsics_utils.h b/compiler/optimizing/intrinsics_utils.h
new file mode 100644
index 0000000000..e70afd29f0
--- /dev/null
+++ b/compiler/optimizing/intrinsics_utils.h
@@ -0,0 +1,88 @@
+/*
+ * Copyright (C) 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_OPTIMIZING_INTRINSICS_UTILS_H_
+#define ART_COMPILER_OPTIMIZING_INTRINSICS_UTILS_H_
+
+#include "base/macros.h"
+#include "code_generator.h"
+#include "locations.h"
+#include "nodes.h"
+#include "utils/assembler.h"
+#include "utils/label.h"
+
+namespace art {
+
+// Default slow-path for fallback (calling the managed code to handle the intrinsic) in an
+// intrinsified call. This will copy the arguments into the positions for a regular call.
+//
+// Note: The actual parameters are required to be in the locations given by the invoke's location
+//       summary. If an intrinsic modifies those locations before a slowpath call, they must be
+//       restored!
+//
+// Note: If an invoke wasn't sharpened, we will put down an invoke-virtual here. That's potentially
+//       sub-optimal (compared to a direct pointer call), but this is a slow-path.
+
+template <typename TDexCallingConvention>
+class IntrinsicSlowPath : public SlowPathCode {
+ public:
+  explicit IntrinsicSlowPath(HInvoke* invoke) : invoke_(invoke) { }
+
+  Location MoveArguments(CodeGenerator* codegen) {
+    TDexCallingConvention calling_convention_visitor;
+    IntrinsicVisitor::MoveArguments(invoke_, codegen, &calling_convention_visitor);
+    return calling_convention_visitor.GetMethodLocation();
+  }
+
+  void EmitNativeCode(CodeGenerator* codegen) OVERRIDE {
+    Assembler* assembler = codegen->GetAssembler();
+    assembler->Bind(GetEntryLabel());
+
+    SaveLiveRegisters(codegen, invoke_->GetLocations());
+
+    Location method_loc = MoveArguments(codegen);
+
+    if (invoke_->IsInvokeStaticOrDirect()) {
+      codegen->GenerateStaticOrDirectCall(invoke_->AsInvokeStaticOrDirect(), method_loc);
+    } else {
+      codegen->GenerateVirtualCall(invoke_->AsInvokeVirtual(), method_loc);
+    }
+    codegen->RecordPcInfo(invoke_, invoke_->GetDexPc(), this);
+
+    // Copy the result back to the expected output.
+    Location out = invoke_->GetLocations()->Out();
+    if (out.IsValid()) {
+      DCHECK(out.IsRegister());  // TODO: Replace this when we support output in memory.
+      DCHECK(!invoke_->GetLocations()->GetLiveRegisters()->ContainsCoreRegister(out.reg()));
+      codegen->MoveFromReturnRegister(out, invoke_->GetType());
+    }
+
+    RestoreLiveRegisters(codegen, invoke_->GetLocations());
+    assembler->Jump(GetExitLabel());
+  }
+
+  const char* GetDescription() const OVERRIDE { return "IntrinsicSlowPath"; }
+
+ private:
+  // The instruction where this slow path is happening.
+  HInvoke* const invoke_;
+
+  DISALLOW_COPY_AND_ASSIGN(IntrinsicSlowPath);
+};
+
+}  // namespace art
+
+#endif  // ART_COMPILER_OPTIMIZING_INTRINSICS_UTILS_H_