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      1   /*
      2  * Copyright (C) 2014 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #include "locations.h"
     18 
     19 #include "nodes.h"
     20 #include "code_generator.h"
     21 
     22 namespace art {
     23 
     24 LocationSummary::LocationSummary(HInstruction* instruction,
     25                                  CallKind call_kind,
     26                                  bool intrinsified)
     27     : inputs_(instruction->InputCount(),
     28               instruction->GetBlock()->GetGraph()->GetArena()->Adapter(kArenaAllocLocationSummary)),
     29       temps_(instruction->GetBlock()->GetGraph()->GetArena()->Adapter(kArenaAllocLocationSummary)),
     30       output_overlaps_(Location::kOutputOverlap),
     31       call_kind_(call_kind),
     32       stack_mask_(nullptr),
     33       register_mask_(0),
     34       live_registers_(),
     35       intrinsified_(intrinsified) {
     36   instruction->SetLocations(this);
     37 
     38   if (NeedsSafepoint()) {
     39     ArenaAllocator* arena = instruction->GetBlock()->GetGraph()->GetArena();
     40     stack_mask_ = ArenaBitVector::Create(arena, 0, true, kArenaAllocLocationSummary);
     41   }
     42 }
     43 
     44 
     45 Location Location::RegisterOrConstant(HInstruction* instruction) {
     46   return instruction->IsConstant()
     47       ? Location::ConstantLocation(instruction->AsConstant())
     48       : Location::RequiresRegister();
     49 }
     50 
     51 Location Location::RegisterOrInt32Constant(HInstruction* instruction) {
     52   HConstant* constant = instruction->AsConstant();
     53   if (constant != nullptr) {
     54     int64_t value = CodeGenerator::GetInt64ValueOf(constant);
     55     if (IsInt<32>(value)) {
     56       return Location::ConstantLocation(constant);
     57     }
     58   }
     59   return Location::RequiresRegister();
     60 }
     61 
     62 Location Location::FpuRegisterOrInt32Constant(HInstruction* instruction) {
     63   HConstant* constant = instruction->AsConstant();
     64   if (constant != nullptr) {
     65     int64_t value = CodeGenerator::GetInt64ValueOf(constant);
     66     if (IsInt<32>(value)) {
     67       return Location::ConstantLocation(constant);
     68     }
     69   }
     70   return Location::RequiresFpuRegister();
     71 }
     72 
     73 Location Location::ByteRegisterOrConstant(int reg, HInstruction* instruction) {
     74   return instruction->IsConstant()
     75       ? Location::ConstantLocation(instruction->AsConstant())
     76       : Location::RegisterLocation(reg);
     77 }
     78 
     79 Location Location::FpuRegisterOrConstant(HInstruction* instruction) {
     80   return instruction->IsConstant()
     81       ? Location::ConstantLocation(instruction->AsConstant())
     82       : Location::RequiresFpuRegister();
     83 }
     84 
     85 std::ostream& operator<<(std::ostream& os, const Location& location) {
     86   os << location.DebugString();
     87   if (location.IsRegister() || location.IsFpuRegister()) {
     88     os << location.reg();
     89   } else if (location.IsPair()) {
     90     os << location.low() << ":" << location.high();
     91   } else if (location.IsStackSlot() || location.IsDoubleStackSlot()) {
     92     os << location.GetStackIndex();
     93   }
     94   return os;
     95 }
     96 
     97 }  // namespace art
     98