6.2.2 Mangled names for code blocks

The rules for mangled names for routines are as follows:

• All routine names are converted to upper case.

• Routines in a unit have their unit name prepended to them : _UNITNAME$$_

• All Routines in the main program have a _ prepended to them.

• All parameters in a routine are mangled using the type of the parameter (in uppercase) prepended by the $ character. This is done in left to right order for each parameter of the routine.

• Objects and classes use special mangling : The class type or object type is given in the mangled name; The mangled name is as follows: _$$_TYPEDECL_$$ optionally preceded by mangled name of the unit and finishing with the method name.

• Do not use public names that start with FPC_, because FPC uses these for internal system routines and constants.

The following constructs

unit testman;

interface
type
  myobject = object
   constructor init;
   procedure mymethod;
  end;

implementation

constructor myobject.init;
begin
end;

procedure myobject.mymethod;
begin
end;

function myfunc: pointer;
begin
end;

procedure myprocedure(var x: integer; y: longint; z : pchar);
begin
end;

end.

will result in the following assembler file for the Intel 80x86 target:

.file "testman.pas"

.text
.balign 16
.globl _TESTMAN$$_$$_MYOBJECT_$$_INIT
_TESTMAN$$_$$_MYOBJECT_$$_INIT:
pushl %ebp
movl %esp,%ebp
subl $4,%esp
movl $0,%edi
call FPC_HELP_CONSTRUCTOR
jz .L5
jmp .L7
.L5:
movl 12(%ebp),%esi
movl $0,%edi
call FPC_HELP_FAIL
.L7:
movl %esi,%eax
testl %esi,%esi
leave
ret $8
.balign 16
.globl _TESTMAN$$_$$_MYOBJECT_$$_MYMETHOD
_TESTMAN$$_$$_MYOBJECT_$$_MYMETHOD:
pushl %ebp
movl %esp,%ebp
leave
ret $4
.balign 16
_TESTMAN$$_MYFUNC:
pushl %ebp
movl %esp,%ebp
subl $4,%esp
movl -4(%ebp),%eax
leave
ret
.balign 16
_TESTMAN$$_MYPROCEDURE$INTEGER$LONGINT$PCHAR:
pushl %ebp
movl %esp,%ebp
leave
ret $12