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 
FromVariant(InstructionSet isa,const std::string & variant,std::string * error_msg)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 
FromBitmap(InstructionSet isa,uint32_t bitmap)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 
FromCppDefines()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 
FromCpuInfo()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 
FromHwcap()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 
FromAssembly()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 
AddFeaturesFromString(const std::string & feature_list,std::string * error_msg) const183 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 
AsArmInstructionSetFeatures() const224 const ArmInstructionSetFeatures* InstructionSetFeatures::AsArmInstructionSetFeatures() const {
225   DCHECK_EQ(InstructionSet::kArm, GetInstructionSet());
226   return down_cast<const ArmInstructionSetFeatures*>(this);
227 }
228 
AsArm64InstructionSetFeatures() const229 const Arm64InstructionSetFeatures* InstructionSetFeatures::AsArm64InstructionSetFeatures() const {
230   DCHECK_EQ(InstructionSet::kArm64, GetInstructionSet());
231   return down_cast<const Arm64InstructionSetFeatures*>(this);
232 }
233 
AsMipsInstructionSetFeatures() const234 const MipsInstructionSetFeatures* InstructionSetFeatures::AsMipsInstructionSetFeatures() const {
235   DCHECK_EQ(InstructionSet::kMips, GetInstructionSet());
236   return down_cast<const MipsInstructionSetFeatures*>(this);
237 }
238 
AsMips64InstructionSetFeatures() const239 const Mips64InstructionSetFeatures* InstructionSetFeatures::AsMips64InstructionSetFeatures() const {
240   DCHECK_EQ(InstructionSet::kMips64, GetInstructionSet());
241   return down_cast<const Mips64InstructionSetFeatures*>(this);
242 }
243 
AsX86InstructionSetFeatures() const244 const X86InstructionSetFeatures* InstructionSetFeatures::AsX86InstructionSetFeatures() const {
245   DCHECK(InstructionSet::kX86 == GetInstructionSet() ||
246          InstructionSet::kX86_64 == GetInstructionSet());
247   return down_cast<const X86InstructionSetFeatures*>(this);
248 }
249 
AsX86_64InstructionSetFeatures() const250 const X86_64InstructionSetFeatures* InstructionSetFeatures::AsX86_64InstructionSetFeatures() const {
251   DCHECK_EQ(InstructionSet::kX86_64, GetInstructionSet());
252   return down_cast<const X86_64InstructionSetFeatures*>(this);
253 }
254 
FindVariantInArray(const char * const variants[],size_t num_variants,const std::string & variant)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 
operator <<(std::ostream & os,const InstructionSetFeatures & rhs)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