constantTag.hpp revision 1879:f95d63e2154a 
1/*
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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24
25#ifndef SHARE_VM_UTILITIES_CONSTANTTAG_HPP
26#define SHARE_VM_UTILITIES_CONSTANTTAG_HPP
27
28#include "prims/jvm.h"
29#include "utilities/top.hpp"
30
31// constant tags in Java .class files
32
33
34enum {
35  // See jvm.h for shared JVM_CONSTANT_XXX tags
36  // NOTE: replicated in SA in vm/agent/sun/jvm/hotspot/utilities/ConstantTag.java
37  // Hotspot specific tags
38  JVM_CONSTANT_Invalid                  = 0,    // For bad value initialization
39  JVM_CONSTANT_InternalMin              = 100,  // First implementation tag (aside from bad value of course)
40  JVM_CONSTANT_UnresolvedClass          = 100,  // Temporary tag until actual use
41  JVM_CONSTANT_ClassIndex               = 101,  // Temporary tag while constructing constant pool
42  JVM_CONSTANT_UnresolvedString         = 102,  // Temporary tag until actual use
43  JVM_CONSTANT_StringIndex              = 103,  // Temporary tag while constructing constant pool
44  JVM_CONSTANT_UnresolvedClassInError   = 104,  // Error tag due to resolution error
45  JVM_CONSTANT_Object                   = 105,  // Required for BoundMethodHandle arguments.
46  JVM_CONSTANT_InternalMax              = 105   // Last implementation tag
47};
48
49
50class constantTag VALUE_OBJ_CLASS_SPEC {
51 private:
52  jbyte _tag;
53 public:
54  bool is_klass() const             { return _tag == JVM_CONSTANT_Class; }
55  bool is_field () const            { return _tag == JVM_CONSTANT_Fieldref; }
56  bool is_method() const            { return _tag == JVM_CONSTANT_Methodref; }
57  bool is_interface_method() const  { return _tag == JVM_CONSTANT_InterfaceMethodref; }
58  bool is_string() const            { return _tag == JVM_CONSTANT_String; }
59  bool is_int() const               { return _tag == JVM_CONSTANT_Integer; }
60  bool is_float() const             { return _tag == JVM_CONSTANT_Float; }
61  bool is_long() const              { return _tag == JVM_CONSTANT_Long; }
62  bool is_double() const            { return _tag == JVM_CONSTANT_Double; }
63  bool is_name_and_type() const     { return _tag == JVM_CONSTANT_NameAndType; }
64  bool is_utf8() const              { return _tag == JVM_CONSTANT_Utf8; }
65
66  bool is_invalid() const           { return _tag == JVM_CONSTANT_Invalid; }
67
68  bool is_unresolved_klass() const {
69    return _tag == JVM_CONSTANT_UnresolvedClass || _tag == JVM_CONSTANT_UnresolvedClassInError;
70  }
71
72  bool is_unresolved_klass_in_error() const {
73    return _tag == JVM_CONSTANT_UnresolvedClassInError;
74  }
75
76  bool is_klass_index() const       { return _tag == JVM_CONSTANT_ClassIndex; }
77  bool is_unresolved_string() const { return _tag == JVM_CONSTANT_UnresolvedString; }
78  bool is_string_index() const      { return _tag == JVM_CONSTANT_StringIndex; }
79
80  bool is_object() const            { return _tag == JVM_CONSTANT_Object; }
81
82  bool is_klass_reference() const   { return is_klass_index() || is_unresolved_klass(); }
83  bool is_klass_or_reference() const{ return is_klass() || is_klass_reference(); }
84  bool is_field_or_method() const   { return is_field() || is_method() || is_interface_method(); }
85  bool is_symbol() const            { return is_utf8(); }
86
87  bool is_method_type() const              { return _tag == JVM_CONSTANT_MethodType; }
88  bool is_method_handle() const            { return _tag == JVM_CONSTANT_MethodHandle; }
89  bool is_invoke_dynamic() const           { return _tag == JVM_CONSTANT_InvokeDynamic; }
90
91  bool is_loadable_constant() const {
92    return ((_tag >= JVM_CONSTANT_Integer && _tag <= JVM_CONSTANT_String) ||
93            is_method_type() || is_method_handle() ||
94            is_unresolved_klass() || is_unresolved_string() ||
95            is_object());
96  }
97
98  constantTag() {
99    _tag = JVM_CONSTANT_Invalid;
100  }
101  constantTag(jbyte tag) {
102    assert((tag >= 0 && tag <= JVM_CONSTANT_NameAndType) ||
103           (tag >= JVM_CONSTANT_MethodHandle && tag <= JVM_CONSTANT_InvokeDynamic) ||
104           (tag >= JVM_CONSTANT_InternalMin && tag <= JVM_CONSTANT_InternalMax), "Invalid constant tag");
105    _tag = tag;
106  }
107
108  jbyte value()                      { return _tag; }
109
110  BasicType basic_type() const;        // if used with ldc, what kind of value gets pushed?
111
112  const char* internal_name() const;  // for error reporting
113
114  void print_on(outputStream* st) const PRODUCT_RETURN;
115};
116
117#endif // SHARE_VM_UTILITIES_CONSTANTTAG_HPP
118