/*
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* Copyright (C) 2015 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef ART_COMPILER_OPTIMIZING_INTRINSICS_UTILS_H_
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#define ART_COMPILER_OPTIMIZING_INTRINSICS_UTILS_H_
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#include "base/macros.h"
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#include "code_generator.h"
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#include "locations.h"
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#include "nodes.h"
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#include "utils/assembler.h"
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#include "utils/label.h"
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namespace art {
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// Default slow-path for fallback (calling the managed code to handle the intrinsic) in an
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// intrinsified call. This will copy the arguments into the positions for a regular call.
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//
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// Note: The actual parameters are required to be in the locations given by the invoke's location
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// summary. If an intrinsic modifies those locations before a slowpath call, they must be
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// restored!
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//
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// Note: If an invoke wasn't sharpened, we will put down an invoke-virtual here. That's potentially
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// sub-optimal (compared to a direct pointer call), but this is a slow-path.
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template <typename TDexCallingConvention>
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class IntrinsicSlowPath : public SlowPathCode {
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public:
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explicit IntrinsicSlowPath(HInvoke* invoke) : SlowPathCode(invoke), invoke_(invoke) { }
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Location MoveArguments(CodeGenerator* codegen) {
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TDexCallingConvention calling_convention_visitor;
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IntrinsicVisitor::MoveArguments(invoke_, codegen, &calling_convention_visitor);
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return calling_convention_visitor.GetMethodLocation();
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}
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void EmitNativeCode(CodeGenerator* codegen) override {
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Assembler* assembler = codegen->GetAssembler();
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assembler->Bind(GetEntryLabel());
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SaveLiveRegisters(codegen, invoke_->GetLocations());
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Location method_loc = MoveArguments(codegen);
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if (invoke_->IsInvokeStaticOrDirect()) {
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codegen->GenerateStaticOrDirectCall(invoke_->AsInvokeStaticOrDirect(), method_loc, this);
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} else {
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codegen->GenerateVirtualCall(invoke_->AsInvokeVirtual(), method_loc, this);
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}
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// Copy the result back to the expected output.
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Location out = invoke_->GetLocations()->Out();
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if (out.IsValid()) {
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DCHECK(out.IsRegister()); // TODO: Replace this when we support output in memory.
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DCHECK(!invoke_->GetLocations()->GetLiveRegisters()->ContainsCoreRegister(out.reg()));
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codegen->MoveFromReturnRegister(out, invoke_->GetType());
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}
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RestoreLiveRegisters(codegen, invoke_->GetLocations());
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assembler->Jump(GetExitLabel());
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}
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const char* GetDescription() const override { return "IntrinsicSlowPath"; }
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private:
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// The instruction where this slow path is happening.
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HInvoke* const invoke_;
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DISALLOW_COPY_AND_ASSIGN(IntrinsicSlowPath);
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};
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} // namespace art
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#endif // ART_COMPILER_OPTIMIZING_INTRINSICS_UTILS_H_
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