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src/hotspot/share/utilities/constantTag.hpp

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 22  *
 23  */
 24 
 25 #ifndef SHARE_UTILITIES_CONSTANTTAG_HPP
 26 #define SHARE_UTILITIES_CONSTANTTAG_HPP
 27 
 28 #include "utilities/globalDefinitions.hpp"
 29 
 30 
 31 class outputStream;
 32 
 33 // constant tags in Java .class files
 34 
 35 enum {
 36   // See jvm.h for shared JVM_CONSTANT_XXX tags
 37   // NOTE: replicated in SA in vm/agent/sun/jvm/hotspot/utilities/ConstantTag.java
 38   // Hotspot specific tags
 39   JVM_CONSTANT_Invalid                  = 0,    // For bad value initialization
 40   JVM_CONSTANT_InternalMin              = 100,  // First implementation tag (aside from bad value of course)
 41   JVM_CONSTANT_UnresolvedClass          = 100,  // Temporary tag until actual use
 42   JVM_CONSTANT_ClassIndex               = 101,  // Temporary tag while constructing constant pool
 43   JVM_CONSTANT_StringIndex              = 102,  // Temporary tag while constructing constant pool
 44   JVM_CONSTANT_UnresolvedClassInError   = 103,  // Error tag due to resolution error
 45   JVM_CONSTANT_MethodHandleInError      = 104,  // Error tag due to resolution error
 46   JVM_CONSTANT_MethodTypeInError        = 105,  // Error tag due to resolution error
 47   JVM_CONSTANT_DynamicInError           = 106,  // Error tag due to resolution error
 48   JVM_CONSTANT_InternalMax              = 106   // Last implementation tag


 49 };
 50 
 51 
 52 class constantTag {
 53  private:
 54   jbyte _tag;
 55  public:
 56   bool is_klass() const             { return _tag == JVM_CONSTANT_Class; }
 57   bool is_field () const            { return _tag == JVM_CONSTANT_Fieldref; }
 58   bool is_method() const            { return _tag == JVM_CONSTANT_Methodref; }
 59   bool is_interface_method() const  { return _tag == JVM_CONSTANT_InterfaceMethodref; }
 60   bool is_string() const            { return _tag == JVM_CONSTANT_String; }
 61   bool is_int() const               { return _tag == JVM_CONSTANT_Integer; }
 62   bool is_float() const             { return _tag == JVM_CONSTANT_Float; }
 63   bool is_long() const              { return _tag == JVM_CONSTANT_Long; }
 64   bool is_double() const            { return _tag == JVM_CONSTANT_Double; }
 65   bool is_name_and_type() const     { return _tag == JVM_CONSTANT_NameAndType; }
 66   bool is_utf8() const              { return _tag == JVM_CONSTANT_Utf8; }
 67 
 68   bool is_invalid() const           { return _tag == JVM_CONSTANT_Invalid; }
 69 
 70   bool is_unresolved_klass() const {
 71     return _tag == JVM_CONSTANT_UnresolvedClass || _tag == JVM_CONSTANT_UnresolvedClassInError;
 72   }
 73 
 74   bool is_unresolved_klass_in_error() const {
 75     return _tag == JVM_CONSTANT_UnresolvedClassInError;




 76   }
 77 
 78   bool is_method_handle_in_error() const {
 79     return _tag == JVM_CONSTANT_MethodHandleInError;
 80   }
 81   bool is_method_type_in_error() const {
 82     return _tag == JVM_CONSTANT_MethodTypeInError;
 83   }
 84 
 85   bool is_dynamic_constant_in_error() const {
 86     return _tag == JVM_CONSTANT_DynamicInError;
 87   }
 88 
 89   bool is_in_error() const {
 90     return is_unresolved_klass_in_error() ||
 91            is_method_handle_in_error()    ||
 92            is_method_type_in_error()      ||
 93            is_dynamic_constant_in_error();
 94   }
 95 

105   bool is_method_handle() const     { return _tag == JVM_CONSTANT_MethodHandle; }
106   bool is_dynamic_constant() const  { return _tag == JVM_CONSTANT_Dynamic; }
107   bool is_invoke_dynamic() const    { return _tag == JVM_CONSTANT_InvokeDynamic; }
108 
109   bool has_bootstrap() const {
110     return (_tag == JVM_CONSTANT_Dynamic ||
111             _tag == JVM_CONSTANT_DynamicInError ||
112             _tag == JVM_CONSTANT_InvokeDynamic);
113   }
114 
115   bool is_loadable_constant() const {
116     return ((_tag >= JVM_CONSTANT_Integer && _tag <= JVM_CONSTANT_String) ||
117             is_method_type() || is_method_handle() || is_dynamic_constant() ||
118             is_unresolved_klass());
119   }
120 
121   constantTag() {
122     _tag = JVM_CONSTANT_Invalid;
123   }
124   constantTag(jbyte tag) {
125     assert((tag >= 0 && tag <= JVM_CONSTANT_NameAndType) ||
126            (tag >= JVM_CONSTANT_MethodHandle && tag <= JVM_CONSTANT_InvokeDynamic) ||
127            (tag >= JVM_CONSTANT_InternalMin && tag <= JVM_CONSTANT_InternalMax), "Invalid constant tag");





128     _tag = tag;
129   }
130 
131   static jbyte type2tag(BasicType bt) {
132     if (is_subword_type(bt)) {
133       bt = T_INT;
134     }
135     if (bt == T_ARRAY) {
136       bt = T_OBJECT;
137     }
138     switch (bt) {
139       case T_INT:    return JVM_CONSTANT_Integer;
140       case T_LONG:   return JVM_CONSTANT_Long;
141       case T_FLOAT:  return JVM_CONSTANT_Float;
142       case T_DOUBLE: return JVM_CONSTANT_Double;
143       case T_OBJECT: return JVM_CONSTANT_String;
144 
145       default:
146         assert(false, "not supported: %s", type2name(bt));
147         return JVM_CONSTANT_Invalid;
148     }
149   }
150 
151   jbyte value() const                { return _tag; }

152   jbyte error_value() const;
153   jbyte non_error_value() const;
154 
155   BasicType basic_type() const;        // if used with ldc, what kind of value gets pushed?
156 
157   const char* internal_name() const;  // for error reporting
158 
159   void print_on(outputStream* st) const PRODUCT_RETURN;
160 };
161 
162 #endif // SHARE_UTILITIES_CONSTANTTAG_HPP

 22  *
 23  */
 24 
 25 #ifndef SHARE_UTILITIES_CONSTANTTAG_HPP
 26 #define SHARE_UTILITIES_CONSTANTTAG_HPP
 27 
 28 #include "utilities/globalDefinitions.hpp"
 29 
 30 
 31 class outputStream;
 32 
 33 // constant tags in Java .class files
 34 
 35 enum {
 36   // See jvm.h for shared JVM_CONSTANT_XXX tags
 37   // NOTE: replicated in SA in vm/agent/sun/jvm/hotspot/utilities/ConstantTag.java
 38   // Hotspot specific tags
 39   JVM_CONSTANT_Invalid                  = 0,    // For bad value initialization
 40   JVM_CONSTANT_InternalMin              = 100,  // First implementation tag (aside from bad value of course)
 41   JVM_CONSTANT_UnresolvedClass          = 100,  // Temporary tag until actual use
 42   JVM_CONSTANT_ClassIndex               = 101,  // Temporary tag while constructing constant pool, class redefinition
 43   JVM_CONSTANT_StringIndex              = 102,  // Temporary tag while constructing constant pool, class redefinition
 44   JVM_CONSTANT_UnresolvedClassInError   = 103,  // Error tag due to resolution error
 45   JVM_CONSTANT_MethodHandleInError      = 104,  // Error tag due to resolution error
 46   JVM_CONSTANT_MethodTypeInError        = 105,  // Error tag due to resolution error
 47   JVM_CONSTANT_DynamicInError           = 106,  // Error tag due to resolution error
 48   JVM_CONSTANT_InternalMax              = 106,  // Last implementation tag
 49   // internal constant tag flags
 50   JVM_CONSTANT_QDescBit                 = (1 << 7) // Separate bit, encode Q type descriptors
 51 };
 52 

 53 class constantTag {
 54  private:
 55   jbyte _tag;
 56  public:
 57   bool is_klass() const             { return value() == JVM_CONSTANT_Class; }
 58   bool is_field () const            { return _tag == JVM_CONSTANT_Fieldref; }
 59   bool is_method() const            { return _tag == JVM_CONSTANT_Methodref; }
 60   bool is_interface_method() const  { return _tag == JVM_CONSTANT_InterfaceMethodref; }
 61   bool is_string() const            { return _tag == JVM_CONSTANT_String; }
 62   bool is_int() const               { return _tag == JVM_CONSTANT_Integer; }
 63   bool is_float() const             { return _tag == JVM_CONSTANT_Float; }
 64   bool is_long() const              { return _tag == JVM_CONSTANT_Long; }
 65   bool is_double() const            { return _tag == JVM_CONSTANT_Double; }
 66   bool is_name_and_type() const     { return _tag == JVM_CONSTANT_NameAndType; }
 67   bool is_utf8() const              { return _tag == JVM_CONSTANT_Utf8; }
 68 
 69   bool is_invalid() const           { return _tag == JVM_CONSTANT_Invalid; }
 70 
 71   bool is_unresolved_klass() const {
 72     return value() == JVM_CONSTANT_UnresolvedClass || value() == JVM_CONSTANT_UnresolvedClassInError;
 73   }
 74 
 75   bool is_unresolved_klass_in_error() const {
 76     return value() == JVM_CONSTANT_UnresolvedClassInError;
 77   }
 78 
 79   bool is_Qdescriptor_klass() const {
 80     return (_tag & JVM_CONSTANT_QDescBit) != 0;
 81   }
 82 
 83   bool is_method_handle_in_error() const {
 84     return _tag == JVM_CONSTANT_MethodHandleInError;
 85   }
 86   bool is_method_type_in_error() const {
 87     return _tag == JVM_CONSTANT_MethodTypeInError;
 88   }
 89 
 90   bool is_dynamic_constant_in_error() const {
 91     return _tag == JVM_CONSTANT_DynamicInError;
 92   }
 93 
 94   bool is_in_error() const {
 95     return is_unresolved_klass_in_error() ||
 96            is_method_handle_in_error()    ||
 97            is_method_type_in_error()      ||
 98            is_dynamic_constant_in_error();
 99   }
100 

110   bool is_method_handle() const     { return _tag == JVM_CONSTANT_MethodHandle; }
111   bool is_dynamic_constant() const  { return _tag == JVM_CONSTANT_Dynamic; }
112   bool is_invoke_dynamic() const    { return _tag == JVM_CONSTANT_InvokeDynamic; }
113 
114   bool has_bootstrap() const {
115     return (_tag == JVM_CONSTANT_Dynamic ||
116             _tag == JVM_CONSTANT_DynamicInError ||
117             _tag == JVM_CONSTANT_InvokeDynamic);
118   }
119 
120   bool is_loadable_constant() const {
121     return ((_tag >= JVM_CONSTANT_Integer && _tag <= JVM_CONSTANT_String) ||
122             is_method_type() || is_method_handle() || is_dynamic_constant() ||
123             is_unresolved_klass());
124   }
125 
126   constantTag() {
127     _tag = JVM_CONSTANT_Invalid;
128   }
129   constantTag(jbyte tag) {
130     jbyte entry_tag = tag & ~JVM_CONSTANT_QDescBit;
131     assert((((tag & JVM_CONSTANT_QDescBit) == 0) && (entry_tag >= 0 && entry_tag <= JVM_CONSTANT_NameAndType) ||
132            (entry_tag >= JVM_CONSTANT_MethodHandle && entry_tag <= JVM_CONSTANT_InvokeDynamic) ||
133            (entry_tag >= JVM_CONSTANT_InternalMin && entry_tag <= JVM_CONSTANT_InternalMax))
134            || (((tag & JVM_CONSTANT_QDescBit) != 0) && (entry_tag == JVM_CONSTANT_Class ||
135                entry_tag == JVM_CONSTANT_UnresolvedClass || entry_tag == JVM_CONSTANT_UnresolvedClassInError
136                || entry_tag == JVM_CONSTANT_ClassIndex))
137                , "Invalid constant tag");
138     _tag = tag;
139   }
140 
141   static jbyte type2tag(BasicType bt) {
142     if (is_subword_type(bt)) {
143       bt = T_INT;
144     }
145     if (bt == T_ARRAY) {
146       bt = T_OBJECT;
147     }
148     switch (bt) {
149       case T_INT:    return JVM_CONSTANT_Integer;
150       case T_LONG:   return JVM_CONSTANT_Long;
151       case T_FLOAT:  return JVM_CONSTANT_Float;
152       case T_DOUBLE: return JVM_CONSTANT_Double;
153       case T_OBJECT: return JVM_CONSTANT_String;
154 
155       default:
156         assert(false, "not supported: %s", type2name(bt));
157         return JVM_CONSTANT_Invalid;
158     }
159   }
160 
161   jbyte value() const                { return _tag & ~JVM_CONSTANT_QDescBit; }
162   jbyte tag() const                  { return _tag; }
163   jbyte error_value() const;
164   jbyte non_error_value() const;
165 
166   BasicType basic_type() const;        // if used with ldc, what kind of value gets pushed?
167 
168   const char* internal_name() const;  // for error reporting
169 
170   void print_on(outputStream* st) const PRODUCT_RETURN;
171 };
172 
173 #endif // SHARE_UTILITIES_CONSTANTTAG_HPP
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