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      1 /*
      2  * Copyright (C) 2011 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 "instruction_set_features.h"
     18 
     19 #include "android-base/strings.h"
     20 
     21 #include "base/casts.h"
     22 #include "base/utils.h"
     23 
     24 #include "arm/instruction_set_features_arm.h"
     25 #include "arm64/instruction_set_features_arm64.h"
     26 #include "mips/instruction_set_features_mips.h"
     27 #include "mips64/instruction_set_features_mips64.h"
     28 #include "x86/instruction_set_features_x86.h"
     29 #include "x86_64/instruction_set_features_x86_64.h"
     30 
     31 namespace art {
     32 
     33 std::unique_ptr<const InstructionSetFeatures> InstructionSetFeatures::FromVariant(
     34     InstructionSet isa, const std::string& variant, std::string* error_msg) {
     35   switch (isa) {
     36     case InstructionSet::kArm:
     37     case InstructionSet::kThumb2:
     38       return ArmInstructionSetFeatures::FromVariant(variant, error_msg);
     39     case InstructionSet::kArm64:
     40       return Arm64InstructionSetFeatures::FromVariant(variant, error_msg);
     41     case InstructionSet::kMips:
     42       return MipsInstructionSetFeatures::FromVariant(variant, error_msg);
     43     case InstructionSet::kMips64:
     44       return Mips64InstructionSetFeatures::FromVariant(variant, error_msg);
     45     case InstructionSet::kX86:
     46       return X86InstructionSetFeatures::FromVariant(variant, error_msg);
     47     case InstructionSet::kX86_64:
     48       return X86_64InstructionSetFeatures::FromVariant(variant, error_msg);
     49 
     50     case InstructionSet::kNone:
     51       break;
     52   }
     53   UNIMPLEMENTED(FATAL) << isa;
     54   UNREACHABLE();
     55 }
     56 
     57 std::unique_ptr<const InstructionSetFeatures> InstructionSetFeatures::FromBitmap(InstructionSet isa,
     58                                                                                  uint32_t bitmap) {
     59   std::unique_ptr<const InstructionSetFeatures> result;
     60   switch (isa) {
     61     case InstructionSet::kArm:
     62     case InstructionSet::kThumb2:
     63       result = ArmInstructionSetFeatures::FromBitmap(bitmap);
     64       break;
     65     case InstructionSet::kArm64:
     66       result = Arm64InstructionSetFeatures::FromBitmap(bitmap);
     67       break;
     68     case InstructionSet::kMips:
     69       result = MipsInstructionSetFeatures::FromBitmap(bitmap);
     70       break;
     71     case InstructionSet::kMips64:
     72       result = Mips64InstructionSetFeatures::FromBitmap(bitmap);
     73       break;
     74     case InstructionSet::kX86:
     75       result = X86InstructionSetFeatures::FromBitmap(bitmap);
     76       break;
     77     case InstructionSet::kX86_64:
     78       result = X86_64InstructionSetFeatures::FromBitmap(bitmap);
     79       break;
     80 
     81     case InstructionSet::kNone:
     82     default:
     83       UNIMPLEMENTED(FATAL) << isa;
     84       UNREACHABLE();
     85   }
     86   CHECK_EQ(bitmap, result->AsBitmap());
     87   return result;
     88 }
     89 
     90 std::unique_ptr<const InstructionSetFeatures> InstructionSetFeatures::FromCppDefines() {
     91   switch (kRuntimeISA) {
     92     case InstructionSet::kArm:
     93     case InstructionSet::kThumb2:
     94       return ArmInstructionSetFeatures::FromCppDefines();
     95     case InstructionSet::kArm64:
     96       return Arm64InstructionSetFeatures::FromCppDefines();
     97     case InstructionSet::kMips:
     98       return MipsInstructionSetFeatures::FromCppDefines();
     99     case InstructionSet::kMips64:
    100       return Mips64InstructionSetFeatures::FromCppDefines();
    101     case InstructionSet::kX86:
    102       return X86InstructionSetFeatures::FromCppDefines();
    103     case InstructionSet::kX86_64:
    104       return X86_64InstructionSetFeatures::FromCppDefines();
    105 
    106     case InstructionSet::kNone:
    107       break;
    108   }
    109   UNIMPLEMENTED(FATAL) << kRuntimeISA;
    110   UNREACHABLE();
    111 }
    112 
    113 
    114 std::unique_ptr<const InstructionSetFeatures> InstructionSetFeatures::FromCpuInfo() {
    115   switch (kRuntimeISA) {
    116     case InstructionSet::kArm:
    117     case InstructionSet::kThumb2:
    118       return ArmInstructionSetFeatures::FromCpuInfo();
    119     case InstructionSet::kArm64:
    120       return Arm64InstructionSetFeatures::FromCpuInfo();
    121     case InstructionSet::kMips:
    122       return MipsInstructionSetFeatures::FromCpuInfo();
    123     case InstructionSet::kMips64:
    124       return Mips64InstructionSetFeatures::FromCpuInfo();
    125     case InstructionSet::kX86:
    126       return X86InstructionSetFeatures::FromCpuInfo();
    127     case InstructionSet::kX86_64:
    128       return X86_64InstructionSetFeatures::FromCpuInfo();
    129 
    130     case InstructionSet::kNone:
    131       break;
    132   }
    133   UNIMPLEMENTED(FATAL) << kRuntimeISA;
    134   UNREACHABLE();
    135 }
    136 
    137 std::unique_ptr<const InstructionSetFeatures> InstructionSetFeatures::FromHwcap() {
    138   switch (kRuntimeISA) {
    139     case InstructionSet::kArm:
    140     case InstructionSet::kThumb2:
    141       return ArmInstructionSetFeatures::FromHwcap();
    142     case InstructionSet::kArm64:
    143       return Arm64InstructionSetFeatures::FromHwcap();
    144     case InstructionSet::kMips:
    145       return MipsInstructionSetFeatures::FromHwcap();
    146     case InstructionSet::kMips64:
    147       return Mips64InstructionSetFeatures::FromHwcap();
    148     case InstructionSet::kX86:
    149       return X86InstructionSetFeatures::FromHwcap();
    150     case InstructionSet::kX86_64:
    151       return X86_64InstructionSetFeatures::FromHwcap();
    152 
    153     case InstructionSet::kNone:
    154       break;
    155   }
    156   UNIMPLEMENTED(FATAL) << kRuntimeISA;
    157   UNREACHABLE();
    158 }
    159 
    160 std::unique_ptr<const InstructionSetFeatures> InstructionSetFeatures::FromAssembly() {
    161   switch (kRuntimeISA) {
    162     case InstructionSet::kArm:
    163     case InstructionSet::kThumb2:
    164       return ArmInstructionSetFeatures::FromAssembly();
    165     case InstructionSet::kArm64:
    166       return Arm64InstructionSetFeatures::FromAssembly();
    167     case InstructionSet::kMips:
    168       return MipsInstructionSetFeatures::FromAssembly();
    169     case InstructionSet::kMips64:
    170       return Mips64InstructionSetFeatures::FromAssembly();
    171     case InstructionSet::kX86:
    172       return X86InstructionSetFeatures::FromAssembly();
    173     case InstructionSet::kX86_64:
    174       return X86_64InstructionSetFeatures::FromAssembly();
    175 
    176     case InstructionSet::kNone:
    177       break;
    178   }
    179   UNIMPLEMENTED(FATAL) << kRuntimeISA;
    180   UNREACHABLE();
    181 }
    182 
    183 std::unique_ptr<const InstructionSetFeatures> InstructionSetFeatures::AddFeaturesFromString(
    184     const std::string& feature_list, std::string* error_msg) const {
    185   if (feature_list.empty()) {
    186     *error_msg = "No instruction set features specified";
    187     return std::unique_ptr<const InstructionSetFeatures>();
    188   }
    189   std::vector<std::string> features;
    190   Split(feature_list, ',', &features);
    191   bool use_default = false;  // Have we seen the 'default' feature?
    192   bool first = false;  // Is this first feature?
    193   for (auto it = features.begin(); it != features.end();) {
    194     if (use_default) {
    195       *error_msg = "Unexpected instruction set features after 'default'";
    196       return std::unique_ptr<const InstructionSetFeatures>();
    197     }
    198     std::string feature = android::base::Trim(*it);
    199     bool erase = false;
    200     if (feature == "default") {
    201       if (!first) {
    202         use_default = true;
    203         erase = true;
    204       } else {
    205         *error_msg = "Unexpected instruction set features before 'default'";
    206         return std::unique_ptr<const InstructionSetFeatures>();
    207       }
    208     }
    209     if (!erase) {
    210       ++it;
    211     } else {
    212       it = features.erase(it);
    213     }
    214     first = true;
    215   }
    216   // Expectation: "default" is standalone, no other flags. But an empty features vector after
    217   // processing can also come along if the handled flags are the only ones in the list. So
    218   // logically, we check "default -> features.empty."
    219   DCHECK(!use_default || features.empty());
    220 
    221   return AddFeaturesFromSplitString(features, error_msg);
    222 }
    223 
    224 const ArmInstructionSetFeatures* InstructionSetFeatures::AsArmInstructionSetFeatures() const {
    225   DCHECK_EQ(InstructionSet::kArm, GetInstructionSet());
    226   return down_cast<const ArmInstructionSetFeatures*>(this);
    227 }
    228 
    229 const Arm64InstructionSetFeatures* InstructionSetFeatures::AsArm64InstructionSetFeatures() const {
    230   DCHECK_EQ(InstructionSet::kArm64, GetInstructionSet());
    231   return down_cast<const Arm64InstructionSetFeatures*>(this);
    232 }
    233 
    234 const MipsInstructionSetFeatures* InstructionSetFeatures::AsMipsInstructionSetFeatures() const {
    235   DCHECK_EQ(InstructionSet::kMips, GetInstructionSet());
    236   return down_cast<const MipsInstructionSetFeatures*>(this);
    237 }
    238 
    239 const Mips64InstructionSetFeatures* InstructionSetFeatures::AsMips64InstructionSetFeatures() const {
    240   DCHECK_EQ(InstructionSet::kMips64, GetInstructionSet());
    241   return down_cast<const Mips64InstructionSetFeatures*>(this);
    242 }
    243 
    244 const X86InstructionSetFeatures* InstructionSetFeatures::AsX86InstructionSetFeatures() const {
    245   DCHECK(InstructionSet::kX86 == GetInstructionSet() ||
    246          InstructionSet::kX86_64 == GetInstructionSet());
    247   return down_cast<const X86InstructionSetFeatures*>(this);
    248 }
    249 
    250 const X86_64InstructionSetFeatures* InstructionSetFeatures::AsX86_64InstructionSetFeatures() const {
    251   DCHECK_EQ(InstructionSet::kX86_64, GetInstructionSet());
    252   return down_cast<const X86_64InstructionSetFeatures*>(this);
    253 }
    254 
    255 bool InstructionSetFeatures::FindVariantInArray(const char* const variants[], size_t num_variants,
    256                                                 const std::string& variant) {
    257   const char* const * begin = variants;
    258   const char* const * end = begin + num_variants;
    259   return std::find(begin, end, variant) != end;
    260 }
    261 
    262 std::ostream& operator<<(std::ostream& os, const InstructionSetFeatures& rhs) {
    263   os << "ISA: " << rhs.GetInstructionSet() << " Feature string: " << rhs.GetFeatureString();
    264   return os;
    265 }
    266 
    267 }  // namespace art
    268