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Symbol Table Structure and Content
A-19
Common Object File Format
A.7.4 Storage Classes
Byte 16 of the symbol table entry indicates the storage class of the symbol.
Storage classes refer to the method in which the C compiler accesses a
symbol. Table A–12 lists valid storage classes.
Table A–12. Symbol Storage Classes
Mnemonic
Value
Storage Class
Mnemonic
Value
Storage Class
C_NULL
0
No storage class
C_UNTAG
12
Union tag
C_AUTO
1
Automatic variable
C_TPDEF
13
Type definition
C_EXT
2
External symbol
C_USTATIC
14
Uninitialized static
C_STAT
3
Static
C_ENTAG
15
Enumeration tag
C_REG
4
Register variable
C_MOE
16
Member of an enumeration
C_EXTDEF
5
External definition
C_REGPARM
17
Register parameter
C_LABEL
6
Label
C_FIELD
18
Bit field
C_ULABEL
7
Undefined label
C_BLOCK
100
Beginning or end of a block;
used only for the .bb and .eb
special symbols
C_MOS
8
Member of a structure
C_FCN
101
Beginning or end of a func-
tion; used only for the .bf and
.ef special symbols
C_ARG
9
Function argument
C_EOS
102
End of structure; used only
for the .eos special symbol
C_STRTAG
10
Structure tag
C_FILE
103
Filename; used only for the
.file special symbol
C_MOU
11
Member of a union
C_LINE
104
Used only by utility programs
Some special symbols are restricted to certain storage classes. Table A–13
lists these symbols and their storage classes.
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