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 // Set to indicate that the ArtMethod is obsolete and has a different DexCache + DexFile from its
49 // declaring class. This flag may only be applied to methods.
50 static constexpr uint32_t kAccObsoleteMethod =        0x00040000;  // method (runtime)
51 // Used by a method to denote that its execution does not need to go through slow path interpreter.
52 static constexpr uint32_t kAccSkipAccessChecks =      0x00080000;  // method (dex only)
53 // Used by a class to denote that the verifier has attempted to check it at least once.
54 static constexpr uint32_t kAccVerificationAttempted = 0x00080000;  // class (runtime)
55 static constexpr uint32_t kAccFastNative =            0x00080000;  // method (dex only)
56 // This is set by the class linker during LinkInterfaceMethods. It is used by a method to represent
57 // that it was copied from its declaring class into another class. All methods marked kAccMiranda
58 // and kAccDefaultConflict will have this bit set. Any kAccDefault method contained in the methods_
59 // array of a concrete class will also have this bit set.
60 static constexpr uint32_t kAccCopied =                0x00100000;  // method (runtime)
61 static constexpr uint32_t kAccMiranda =               0x00200000;  // method (dex only)
62 static constexpr uint32_t kAccDefault =               0x00400000;  // method (runtime)
63 // This is set by the class linker during LinkInterfaceMethods. Prior to that point we do not know
64 // if any particular method needs to be a default conflict. Used to figure out at runtime if
65 // invoking this method will throw an exception.
66 static constexpr uint32_t kAccDefaultConflict =       0x00800000;  // method (runtime)
67 
68 // Set by the verifier for a method we do not want the compiler to compile.
69 static constexpr uint32_t kAccCompileDontBother =     0x01000000;  // method (runtime)
70 
71 // Set by the verifier for a method that could not be verified to follow structured locking.
72 static constexpr uint32_t kAccMustCountLocks =        0x02000000;  // method (runtime)
73 
74 // Set by the class linker for a method that has only one implementation for a
75 // virtual call.
76 static constexpr uint32_t kAccSingleImplementation =  0x08000000;  // method (runtime)
77 
78 static constexpr uint32_t kAccIntrinsic  =            0x80000000;  // method (runtime)
79 
80 // Special runtime-only flags.
81 // Interface and all its super-interfaces with default methods have been recursively initialized.
82 static constexpr uint32_t kAccRecursivelyInitialized    = 0x20000000;
83 // Interface declares some default method.
84 static constexpr uint32_t kAccHasDefaultMethod          = 0x40000000;
85 // class/ancestor overrides finalize()
86 static constexpr uint32_t kAccClassIsFinalizable        = 0x80000000;
87 
88 static constexpr uint32_t kAccFlagsNotUsedByIntrinsic   = 0x007FFFFF;
89 static constexpr uint32_t kAccMaxIntrinsic              = 0xFF;
90 
91 // Valid (meaningful) bits for a field.
92 static constexpr uint32_t kAccValidFieldFlags = kAccPublic | kAccPrivate | kAccProtected |
93     kAccStatic | kAccFinal | kAccVolatile | kAccTransient | kAccSynthetic | kAccEnum;
94 
95 // Valid (meaningful) bits for a method.
96 static constexpr uint32_t kAccValidMethodFlags = kAccPublic | kAccPrivate | kAccProtected |
97     kAccStatic | kAccFinal | kAccSynchronized | kAccBridge | kAccVarargs | kAccNative |
98     kAccAbstract | kAccStrict | kAccSynthetic | kAccMiranda | kAccConstructor |
99     kAccDeclaredSynchronized;
100 
101 // Valid (meaningful) bits for a class (not interface).
102 // Note 1. These are positive bits. Other bits may have to be zero.
103 // Note 2. Inner classes can expose more access flags to Java programs. That is handled by libcore.
104 static constexpr uint32_t kAccValidClassFlags = kAccPublic | kAccFinal | kAccSuper |
105     kAccAbstract | kAccSynthetic | kAccEnum;
106 
107 // Valid (meaningful) bits for an interface.
108 // Note 1. Annotations are interfaces.
109 // Note 2. These are positive bits. Other bits may have to be zero.
110 // Note 3. Inner classes can expose more access flags to Java programs. That is handled by libcore.
111 static constexpr uint32_t kAccValidInterfaceFlags = kAccPublic | kAccInterface |
112     kAccAbstract | kAccSynthetic | kAccAnnotation;
113 
114 }  // namespace art
115 
116 #endif  // ART_RUNTIME_MODIFIERS_H_
117 
118