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system.inc
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{
$Id: system.inc,v 1.28 1998/08/17 12:24:16 carl Exp $
This file is part of the Free Pascal Run time library.
Copyright (c) 1993,97 by the Free Pascal development team
See the file COPYING.FPC, included in this distribution,
For details about the copyright.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
**********************************************************************}
{****************************************************************************
Local types
****************************************************************************}
{
TextRec and FileRec are put in a separate file to make it available to other
units without putting it explicitly in systemh.
This way we keep TP compatibility, and the TextRec definition is available
for everyone who needs it.
}
{$i filerec.inc}
{$i textrec.inc}
Procedure HandleError (Errno : Longint); forward;
type
FileFunc = Procedure(var t : TextRec);
const
{ Random / Randomize constants }
OldRandSeed : Longint = 0;
InitialSeed : Boolean = TRUE;
Seed1 : Longint = 0;
Seed2 : Longint = 0;
Seed3 : Longint = 0;
{ For Error Handling.}
DoError : Boolean = FALSE;
ErrorBase : Longint = 0;
{****************************************************************************
Include processor specific routines
****************************************************************************}
{$IFDEF I386}
{$IFDEF M68K}
{$Error Can't determine processor type !}
{$ENDIF}
{$I i386.inc} { Case dependent, don't change }
{$ELSE}
{$IFDEF M68K}
{$I m68k.inc} { Case dependent, don't change }
{$ELSE}
{$Error Can't determine processor type !}
{$ENDIF}
{$ENDIF}
{****************************************************************************
Routines which have compiler magic
****************************************************************************}
{$I innr.inc}
Function lo(i : Integer) : byte; [INTERNPROC: In_lo_Word];
Function lo(w : Word) : byte; [INTERNPROC: In_lo_Word];
Function lo(l : Longint) : Word; [INTERNPROC: In_lo_long];
Function hi(i : Integer) : byte; [INTERNPROC: In_hi_Word];
Function hi(w : Word) : byte; [INTERNPROC: In_hi_Word];
Function hi(l : Longint) : Word; [INTERNPROC: In_hi_long];
{$ifdef VER0_99_5}
Procedure Inc(var i : Cardinal); [INTERNPROC: In_Inc_DWord];
Procedure Inc(var i : Longint); [INTERNPROC: In_Inc_DWord];
Procedure Inc(var i : Integer); [INTERNPROC: In_Inc_Word];
Procedure Inc(var i : Word); [INTERNPROC: In_Inc_Word];
Procedure Inc(var i : shortint); [INTERNPROC: In_Inc_byte];
Procedure Inc(var i : byte); [INTERNPROC: In_Inc_byte];
Procedure Inc(var c : Char); [INTERNPROC: In_Inc_byte];
Procedure Inc(var p : PChar); [INTERNPROC: In_Inc_DWord];
Procedure Dec(var i : Cardinal); [INTERNPROC: In_Dec_DWord];
Procedure Dec(var i : Longint); [INTERNPROC: In_Dec_DWord];
Procedure Dec(var i : Integer); [INTERNPROC: In_Dec_Word];
Procedure Dec(var i : Word); [INTERNPROC: In_Dec_Word];
Procedure Dec(var i : shortint); [INTERNPROC: In_Dec_byte];
Procedure Dec(var i : byte); [INTERNPROC: In_Dec_byte];
Procedure Dec(var c : Char); [INTERNPROC: In_Dec_byte];
Procedure Dec(var p : PChar); [INTERNPROC: In_Dec_DWord];
{$endif VER0_99_5}
Function chr(b : byte) : Char; [INTERNPROC: In_chr_byte];
Function Length(s : string) : byte; [INTERNPROC: In_Length_string];
Procedure Reset(var f : TypedFile); [INTERNPROC: In_Reset_TypedFile];
Procedure Rewrite(var f : TypedFile); [INTERNPROC: In_Rewrite_TypedFile];
{****************************************************************************
Set Handling
****************************************************************************}
{ Include set support which is processor specific}
{$I set.inc}
{****************************************************************************
Subroutines for String handling
****************************************************************************}
{ Needs to be before RTTI handling }
{$i sstrings.inc}
{$ifdef UseAnsiStrings}
Type
PLongint = ^Longint;
PByte = ^Byte;
{$i astrings.pp}
{$else}
{ Provide dummy procedures needed for rtti}
Procedure decr_ansi_ref (P : pointer);[Alias : 'DECR_ANSI_REF'];
begin
end;
Procedure incr_ansi_ref (P : pointer);[Alias : 'INCR_ANSI_REF'];
begin
end;
{$endif}
{****************************************************************************
Run-Time Type Information (RTTI)
****************************************************************************}
{$ifndef VER0_99_5}
{$i rtti.inc}
{$endif VER0_99_5}
{****************************************************************************
Math Routines
****************************************************************************}
{$ifndef RTLLITE}
function Hi(b : byte): byte;
begin
Hi := b shr 4
end;
function Lo(b : byte): byte;
begin
Lo := b and $0f
end;
{$ifdef VER0_99_5}
Procedure Inc(var i : Cardinal;a: Longint);
Begin
I:=I+A;
End;
Procedure Dec(var i : Cardinal;a: Longint);
Begin
I:=I-A;
End;
Procedure Inc(var i : Longint;a : Longint);
Begin
i:=i+a;
End;
Procedure Dec(var i : Longint;a : Longint);
Begin
i:=i-a;
End;
Procedure Dec(var i : Word;a : Longint);
Begin
i:=i-a;
End;
Procedure Inc(var i : Word;a : Longint);
Begin
i:=i+a;
End;
Procedure Dec(var i : Integer;a : Longint);
Begin
i:=i-a;
End;
Procedure Inc(var i : Integer;a : Longint);
Begin
i:=i+a;
End;
Procedure Dec(var i : byte;a : Longint);
Begin
i:=i-a;
End;
Procedure Inc(var i : byte;a : Longint);
Begin
i:=i+a;
End;
Procedure Dec(var i : shortint;a : Longint);
Begin
i:=i-a;
End;
Procedure Inc(var i : shortint;a : Longint);
Begin
i:=i+a;
End;
Procedure Dec(var c : Char;a : Longint);
Begin
byte(c):=byte(c)-a;
End;
Procedure Inc(var c : Char;a : Longint);
Begin
Byte(c):=byte(c)+a;
End;
Procedure Dec(var p : PChar;a : Longint);
Begin
longint(p):=longint(p)-a;
End;
Procedure Inc(var p : PChar;a : Longint);
Begin
longint(p):=longint(p)+a;
End;
{$endif VER0_99_5}
Function swap (X : Word) : Word;
Begin
swap:=(X and $ff) shl 8 + (X shr 8)
End;
Function Swap (X : Integer) : Integer;
Begin
Swap:=Integer(Swap(Word(X)));
End;
Function swap (X : Longint) : Longint;
Begin
Swap:=(X and $ffff) shl 16 + (X shr 16)
End;
Function Swap (X : Cardinal) : Cardinal;
Begin
Swap:=Swap(Longint(X));
End;
{$endif RTLLITE}
{****************************************************************************
Random function routines
This implements a very long cycle random number generator by combining
three independant generators. The technique was described in the March
1987 issue of Byte.
Taken and modified with permission from the PCQ Pascal rtl code.
****************************************************************************}
{$R-}
{$Q-}
Procedure UseSeed(seed : Longint);Forward;
Function Random : Real;
var
ReturnValue : Real;
begin
if (InitialSeed) OR ((RandSeed <> OldRandSeed) AND NOT InitialSeed) then
Begin
OldRandSeed:=RandSeed;
{ This is a pretty complicated affair }
{ Initially we must call UseSeed when RandSeed is initalized }
{ We must also call UseSeed each time RandSeed is reinitialized }
{ DO NOT CHANGE THE ORDER OF DECLARATIONS IN THIS BLOCK }
{ UNLESS YOU WANT RANDON TO CRASH OF COURSE (CEC) }
InitialSeed:=FALSE;
UseSeed(Randseed);
end;
Inc(Seed1);
Seed1 := (Seed1 * 706) mod 500009;
INC(Seed2);
Seed2 := (Seed2 * 774) MOD 600011;
INC(Seed3);
Seed3 := (Seed3 * 871) MOD 765241;
ReturnValue := Seed1/500009.0 +
Seed2/600011.0 +
Seed3/765241.0;
Random := frac(ReturnValue);
end;
Function Random(l : Longint) : Longint;
begin
if (InitialSeed) OR ((RandSeed <> OldRandSeed) AND NOT InitialSeed) then
Begin
OldRandSeed:=RandSeed;
{ This is a pretty complicated affair }
{ Initially we must call UseSeed when RandSeed is initalized }
{ We must also call UseSeed each time RandSeed is reinitialized }
{ DO NOT CHANGE THE ORDER OF DECLARATIONS IN THIS BLOCK }
{ UNLESS YOU WANT RANDON TO CRASH OF COURSE (CEC) }
InitialSeed:=FALSE;
UseSeed(Randseed);
end;
Inc(Seed1);
Seed1 := (Seed1 * 998) mod 1000003;
Random := Seed1 mod l;
end;
Procedure UseSeed(seed : Longint);
begin
Seed1 := seed mod 1000003;
Seed2 := (Random(65000) * Random(65000)) mod 600011;
Seed3 := (Random(65000) * Random(65000)) mod 765241;
end;
{ Include processor specific routines }
{$I math.inc}
{****************************************************************************
Memory Management
****************************************************************************}
{$ifndef RTLLITE}
Function Ptr(sel,off : Longint) : pointer;
Begin
sel:=0;
ptr:=pointer(off);
End;
Function Addr (Var X) : Pointer;
Begin
Addr:=@(X);
End;
Function CSeg : Word;
Begin
Cseg:=0;
End;
Function DSeg : Word;
Begin
Dseg:=0;
End;
Function SSeg : Word;
Begin
Sseg:=0;
End;
{$endif RTLLITE}
{*****************************************************************************
Miscellaneous
*****************************************************************************}
Function IOResult:Word;
Begin
IOResult:=InOutRes;
InOutRes:=0;
End;
procedure fillchar(var x;count : longint;value : char);
begin
fillchar(x,count,byte(value));
end;
{*****************************************************************************
Init / Exit / ExitProc
*****************************************************************************}
Procedure RunError;
Begin
RunError (0);
End;
Procedure Halt;
Begin
Halt(0);
End;
Procedure dump_stack(bp : Longint);
Procedure dump_frame(addr : Longint);
Begin
{To be used by symify}
Writeln(stderr,' 0x',HexStr(addr,8));
{$ifdef VER0_99_5}
Flush(stderr);
{$endif VER0_99_5}
End;
var
i, prevbp : Longint;
Begin
prevbp:=bp-1;
i:=0;
while bp > prevbp Do
Begin
dump_frame(get_addr(bp));
Inc(i);
If i>max_frame_dump Then
exit;
prevbp:=bp;
bp:=get_next_frame(bp);
End;
End;
Procedure Do_exit;[Public,Alias: '__EXIT'];
{
Don't call this direct, the call is generated by the compiler
and by the halt procedure.
NOTICE: (CEC - 14/Aug/1998)
The order of calling this routine must not be changed, especially
regarding doerror, doerror should only be set by handlerror
and runerror and nowhere else, as certain system units require
exit procedures to clean up, and they rely on this behavior as not
to call themselves recursively.
}
var
current_exit : Procedure;
Begin
while exitProc<>nil Do
Begin
InOutRes:=0;
current_exit:=tProcedure(exitProc);
exitProc:=nil;
current_exit();
End;
If DoError Then
Begin
Writeln('Run time error ',Errorcode,' at 0x',hexstr(Longint(Erroraddr),8));
dump_stack(ErrorBase);
End;
{$ifdef VER0_99_5}
Flush(stderr);
{$endif VER0_99_5}
End;
Type
PExitProcInfo = ^TExitProcInfo;
TExitProcInfo = Record
Next : PExitProcInfo;
SaveExit : Pointer;
Proc : TProcedure;
End;
const
ExitProcList: PExitProcInfo = nil;
Procedure DoExitProc;
var
P : PExitProcInfo;
Proc : TProcedure;
Begin
P:=ExitProcList;
ExitProcList:=P^.Next;
ExitProc:=P^.SaveExit;
Proc:=P^.Proc;
DisPose(P);
Proc();
End;
Procedure AddExitProc(Proc: TProcedure);
var
P : PExitProcInfo;
Begin
New(P);
P^.Next:=ExitProcList;
P^.SaveExit:=ExitProc;
P^.Proc:=Proc;
ExitProcList:=P;
ExitProc:=@DoExitProc;
End;
{*****************************************************************************
Assert() support.
*****************************************************************************}
Procedure do_assert (Const Name,Msg : string; LineNo : Longint); [Public,Alias : 'FPC_DO_ASSERT'];
begin
If msg='' then
write (stderr,'Assertion failed. ')
else
write (stderr,msg);
writeln (stderr,'(File : ',name,', line ',LineNo,'.');
flush (stderr);
HandleError (227);
end;
{*****************************************************************************
SetJmp/LongJmp support.
*****************************************************************************}
{$i setjump.inc}
{*****************************************************************************
Exception support.
*****************************************************************************}
{ No go, because objpas needed :( (MVC) }
{ $i except.inc}
{
$Log: system.inc,v $
Revision 1.28 1998/08/17 12:24:16 carl
+ important comment added
Revision 1.27 1998/08/13 16:22:11 jonas
* random now returns a value between 0 and max-1 instead of between 0 and max
Revision 1.26 1998/08/11 00:05:26 peter
* $ifdef ver0_99_5 updates
Revision 1.25 1998/07/30 13:26:18 michael
+ Added support for ErrorProc variable. All internal functions are required
to call HandleError instead of runerror from now on.
This is necessary for exception support.
Revision 1.24 1998/07/28 20:37:45 michael
+ added setjmp/longjmp and exception support
Revision 1.23 1998/07/23 19:53:20 michael
+ Adapted assert to Delphi format
Revision 1.22 1998/07/23 13:08:41 michael
+ Implemented DO_ASSERT function.
Revision 1.21 1998/07/15 12:09:35 carl
* would not compile under FPC v0.99.5
Revision 1.20 1998/07/13 21:19:12 florian
* some problems with ansi string support fixed
Revision 1.19 1998/07/08 11:56:55 carl
* randon and Random(l) now work correctly - don't touch it works!
Revision 1.18 1998/07/02 13:01:55 carl
* hmmm... it is luck (BSS zeroed with GAS) that DoError and ErrorBase work.
Now they are initilized instead.
Revision 1.17 1998/07/02 12:53:09 carl
* DOERROR RESOTRED! DON'T TOUCH :)
Revision 1.16 1998/07/02 12:11:50 carl
* no SINGLE in m68k and other processors!
Revision 1.15 1998/07/02 09:25:05 peter
* fixed do_error in runtimeerror
Revision 1.14 1998/07/01 15:29:59 peter
* better readln/writeln
Revision 1.13 1998/06/26 08:21:09 daniel
- Doerror removed.
Revision 1.12 1998/06/25 14:04:25 peter
+ internal inc/dec
Revision 1.11 1998/06/25 09:44:20 daniel
+ RTLLITE directive to compile minimal RTL.
Revision 1.10 1998/06/15 15:16:26 daniel
* RTLLITE conditional added to produce smaller RTL
Revision 1.9 1998/06/10 07:46:45 michael
+ Forgot to commit some changes
Revision 1.8 1998/06/08 12:38:24 michael
Implemented rtti, inserted ansistrings again
Revision 1.7 1998/06/04 23:46:01 peter
* comp,extended are only i386 added support_comp,support_extended
Revision 1.6 1998/05/20 11:23:09 cvs
* test commit. Shouldn't be allowed.
Revision 1.5 1998/05/12 10:42:45 peter
* moved getopts to inc/, all supported OS's need argc,argv exported
+ strpas, strlen are now exported in the systemunit
* removed logs
* removed $ifdef ver_above
Revision 1.4 1998/04/16 12:30:47 peter
+ inc(pchar), dec(pchar), incc(pchar,a),dec(pchar,a)
Revision 1.3 1998/04/08 07:53:32 michael
+ Changed Random() function. Moved from system to processor dependent files (from Pedro Gimeno)
}