6.2.1 Mangled names for data blocks

The rules for mangled names for variables and typed constants are as follows:

All variable names are converted to upper case
Variables in the main program or private to a unit have an _ prepended to their names
Typed constants in the main program have an TC__ prepended to their names
Public variables in a unit have their unit name prepended to them : U_UNITNAME_
Public and private typed constants in a unit have their unit name prepended to them :TC__UNITNAME$$

Currently, in Free Pascal v1.0, if you declare a variable in unit name tunit, with the name _a, and you declare the same variable with name a in unit name tunit_, you will get the same mangled name. This is a limitation of the compiler which will be xed in release v1.1.

Examples

unit testvars;

interface

const
publictypedconst : integer = 0;
var
publicvar : integer;

implementation
const
privatetypedconst : integer = 1;
var
privatevar : integer;

end.

Will give the following assembler output under GNU as :

.file "testvars.pas"

.text

.data
# [6] publictypedconst : integer = 0;
.globl TC__TESTVARS$$_PUBLICTYPEDCONST
TC__TESTVARS$$_PUBLICTYPEDCONST:
.short 0
# [12] privatetypedconst : integer = 1;
TC__TESTVARS$$_PRIVATETYPEDCONST:
.short 1

.bss
# [8] publicvar : integer;
.comm U_TESTVARS_PUBLICVAR,2
# [14] privatevar : integer;
.lcomm _PRIVATEVAR,2

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