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      1 /*
      2  * Copyright (C) 2012 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 #ifndef ART_RUNTIME_MODIFIERS_H_
     18 #define ART_RUNTIME_MODIFIERS_H_
     19 
     20 #include <stdint.h>
     21 
     22 namespace art {
     23 
     24 static constexpr uint32_t kAccPublic =       0x0001;  // class, field, method, ic
     25 static constexpr uint32_t kAccPrivate =      0x0002;  // field, method, ic
     26 static constexpr uint32_t kAccProtected =    0x0004;  // field, method, ic
     27 static constexpr uint32_t kAccStatic =       0x0008;  // field, method, ic
     28 static constexpr uint32_t kAccFinal =        0x0010;  // class, field, method, ic
     29 static constexpr uint32_t kAccSynchronized = 0x0020;  // method (only allowed on natives)
     30 static constexpr uint32_t kAccSuper =        0x0020;  // class (not used in dex)
     31 static constexpr uint32_t kAccVolatile =     0x0040;  // field
     32 static constexpr uint32_t kAccBridge =       0x0040;  // method (1.5)
     33 static constexpr uint32_t kAccTransient =    0x0080;  // field
     34 static constexpr uint32_t kAccVarargs =      0x0080;  // method (1.5)
     35 static constexpr uint32_t kAccNative =       0x0100;  // method
     36 static constexpr uint32_t kAccInterface =    0x0200;  // class, ic
     37 static constexpr uint32_t kAccAbstract =     0x0400;  // class, method, ic
     38 static constexpr uint32_t kAccStrict =       0x0800;  // method
     39 static constexpr uint32_t kAccSynthetic =    0x1000;  // class, field, method, ic
     40 static constexpr uint32_t kAccAnnotation =   0x2000;  // class, ic (1.5)
     41 static constexpr uint32_t kAccEnum =         0x4000;  // class, field, ic (1.5)
     42 
     43 static constexpr uint32_t kAccJavaFlagsMask = 0xffff;  // bits set from Java sources (low 16)
     44 
     45 static constexpr uint32_t kAccConstructor =           0x00010000;  // method (dex only) <(cl)init>
     46 static constexpr uint32_t kAccDeclaredSynchronized =  0x00020000;  // method (dex only)
     47 static constexpr uint32_t kAccClassIsProxy =          0x00040000;  // class  (dex only)
     48 // Used by a method to denote that its execution does not need to go through slow path interpreter.
     49 static constexpr uint32_t kAccSkipAccessChecks =      0x00080000;  // method (dex only)
     50 // Used by a class to denote that the verifier has attempted to check it at least once.
     51 static constexpr uint32_t kAccVerificationAttempted = 0x00080000;  // class (runtime)
     52 static constexpr uint32_t kAccFastNative =            0x00080000;  // method (dex only)
     53 // This is set by the class linker during LinkInterfaceMethods. It is used by a method to represent
     54 // that it was copied from its declaring class into another class. All methods marked kAccMiranda
     55 // and kAccDefaultConflict will have this bit set. Any kAccDefault method contained in the methods_
     56 // array of a concrete class will also have this bit set.
     57 static constexpr uint32_t kAccCopied =                0x00100000;  // method (runtime)
     58 static constexpr uint32_t kAccMiranda =               0x00200000;  // method (dex only)
     59 static constexpr uint32_t kAccDefault =               0x00400000;  // method (runtime)
     60 // This is set by the class linker during LinkInterfaceMethods. Prior to that point we do not know
     61 // if any particular method needs to be a default conflict. Used to figure out at runtime if
     62 // invoking this method will throw an exception.
     63 static constexpr uint32_t kAccDefaultConflict =       0x00800000;  // method (runtime)
     64 
     65 // Set by the verifier for a method we do not want the compiler to compile.
     66 static constexpr uint32_t kAccCompileDontBother =     0x01000000;  // method (runtime)
     67 
     68 // Set by the verifier for a method that could not be verified to follow structured locking.
     69 static constexpr uint32_t kAccMustCountLocks =        0x02000000;  // method (runtime)
     70 
     71 // Special runtime-only flags.
     72 // Interface and all its super-interfaces with default methods have been recursively initialized.
     73 static constexpr uint32_t kAccRecursivelyInitialized    = 0x20000000;
     74 // Interface declares some default method.
     75 static constexpr uint32_t kAccHasDefaultMethod          = 0x40000000;
     76 // class/ancestor overrides finalize()
     77 static constexpr uint32_t kAccClassIsFinalizable        = 0x80000000;
     78 
     79 // Valid (meaningful) bits for a field.
     80 static constexpr uint32_t kAccValidFieldFlags = kAccPublic | kAccPrivate | kAccProtected |
     81     kAccStatic | kAccFinal | kAccVolatile | kAccTransient | kAccSynthetic | kAccEnum;
     82 
     83 // Valid (meaningful) bits for a method.
     84 static constexpr uint32_t kAccValidMethodFlags = kAccPublic | kAccPrivate | kAccProtected |
     85     kAccStatic | kAccFinal | kAccSynchronized | kAccBridge | kAccVarargs | kAccNative |
     86     kAccAbstract | kAccStrict | kAccSynthetic | kAccMiranda | kAccConstructor |
     87     kAccDeclaredSynchronized;
     88 
     89 // Valid (meaningful) bits for a class (not interface).
     90 // Note 1. These are positive bits. Other bits may have to be zero.
     91 // Note 2. Inner classes can expose more access flags to Java programs. That is handled by libcore.
     92 static constexpr uint32_t kAccValidClassFlags = kAccPublic | kAccFinal | kAccSuper |
     93     kAccAbstract | kAccSynthetic | kAccEnum;
     94 
     95 // Valid (meaningful) bits for an interface.
     96 // Note 1. Annotations are interfaces.
     97 // Note 2. These are positive bits. Other bits may have to be zero.
     98 // Note 3. Inner classes can expose more access flags to Java programs. That is handled by libcore.
     99 static constexpr uint32_t kAccValidInterfaceFlags = kAccPublic | kAccInterface |
    100     kAccAbstract | kAccSynthetic | kAccAnnotation;
    101 
    102 }  // namespace art
    103 
    104 #endif  // ART_RUNTIME_MODIFIERS_H_
    105 
    106