constantTag.hpp revision 1580:083fde3b838e 
1/*
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24
25// constant tags in Java .class files
26
27
28enum {
29  // See jvm.h for shared JVM_CONSTANT_XXX tags
30  // NOTE: replicated in SA in vm/agent/sun/jvm/hotspot/utilities/ConstantTag.java
31  // Hotspot specific tags
32  JVM_CONSTANT_Invalid                  = 0,    // For bad value initialization
33  JVM_CONSTANT_InternalMin              = 100,  // First implementation tag (aside from bad value of course)
34  JVM_CONSTANT_UnresolvedClass          = 100,  // Temporary tag until actual use
35  JVM_CONSTANT_ClassIndex               = 101,  // Temporary tag while constructing constant pool
36  JVM_CONSTANT_UnresolvedString         = 102,  // Temporary tag until actual use
37  JVM_CONSTANT_StringIndex              = 103,  // Temporary tag while constructing constant pool
38  JVM_CONSTANT_UnresolvedClassInError   = 104,  // Error tag due to resolution error
39  JVM_CONSTANT_Object                   = 105,  // Required for BoundMethodHandle arguments.
40  JVM_CONSTANT_InternalMax              = 105   // Last implementation tag
41};
42
43
44class constantTag VALUE_OBJ_CLASS_SPEC {
45 private:
46  jbyte _tag;
47 public:
48  bool is_klass() const             { return _tag == JVM_CONSTANT_Class; }
49  bool is_field () const            { return _tag == JVM_CONSTANT_Fieldref; }
50  bool is_method() const            { return _tag == JVM_CONSTANT_Methodref; }
51  bool is_interface_method() const  { return _tag == JVM_CONSTANT_InterfaceMethodref; }
52  bool is_string() const            { return _tag == JVM_CONSTANT_String; }
53  bool is_int() const               { return _tag == JVM_CONSTANT_Integer; }
54  bool is_float() const             { return _tag == JVM_CONSTANT_Float; }
55  bool is_long() const              { return _tag == JVM_CONSTANT_Long; }
56  bool is_double() const            { return _tag == JVM_CONSTANT_Double; }
57  bool is_name_and_type() const     { return _tag == JVM_CONSTANT_NameAndType; }
58  bool is_utf8() const              { return _tag == JVM_CONSTANT_Utf8; }
59
60  bool is_invalid() const           { return _tag == JVM_CONSTANT_Invalid; }
61
62  bool is_unresolved_klass() const {
63    return _tag == JVM_CONSTANT_UnresolvedClass || _tag == JVM_CONSTANT_UnresolvedClassInError;
64  }
65
66  bool is_unresolved_klass_in_error() const {
67    return _tag == JVM_CONSTANT_UnresolvedClassInError;
68  }
69
70  bool is_klass_index() const       { return _tag == JVM_CONSTANT_ClassIndex; }
71  bool is_unresolved_string() const { return _tag == JVM_CONSTANT_UnresolvedString; }
72  bool is_string_index() const      { return _tag == JVM_CONSTANT_StringIndex; }
73
74  bool is_object() const            { return _tag == JVM_CONSTANT_Object; }
75
76  bool is_klass_reference() const   { return is_klass_index() || is_unresolved_klass(); }
77  bool is_klass_or_reference() const{ return is_klass() || is_klass_reference(); }
78  bool is_field_or_method() const   { return is_field() || is_method() || is_interface_method(); }
79  bool is_symbol() const            { return is_utf8(); }
80
81  bool is_method_type() const              { return _tag == JVM_CONSTANT_MethodType; }
82  bool is_method_handle() const            { return _tag == JVM_CONSTANT_MethodHandle; }
83  bool is_invoke_dynamic() const           { return _tag == JVM_CONSTANT_InvokeDynamic; }
84
85  constantTag() {
86    _tag = JVM_CONSTANT_Invalid;
87  }
88  constantTag(jbyte tag) {
89    assert((tag >= 0 && tag <= JVM_CONSTANT_NameAndType) ||
90           (tag >= JVM_CONSTANT_MethodHandle && tag <= JVM_CONSTANT_InvokeDynamic) ||
91           (tag >= JVM_CONSTANT_InternalMin && tag <= JVM_CONSTANT_InternalMax), "Invalid constant tag");
92    _tag = tag;
93  }
94
95  jbyte value()                      { return _tag; }
96
97  BasicType basic_type() const;        // if used with ldc, what kind of value gets pushed?
98
99  const char* internal_name() const;  // for error reporting
100
101  void print_on(outputStream* st) const PRODUCT_RETURN;
102};
103