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/*
* 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) : SlowPathCode(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, this);
} else {
codegen->GenerateVirtualCall(invoke_->AsInvokeVirtual(), method_loc, 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_
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