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m2lm.mod
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1345 lines (1143 loc) · 31.1 KB
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(*$Segment M2LM*)
(*$RangeCheck+*)
(*$OverflowCheck+*)
IMPLEMENTATION MODULE M2LM; (* HS 20.5.85 / WH 2.8.85 *)
FROM Common IMPORT String255, ConvStrToPStr;
FROM EZFileSystem IMPORT MakeFileName;
FROM M2DM IMPORT
ObjPtr, StrPtr, KeyPtr, ObjClass, mainmod, aAdr, StrForm, stringtyp,
sObjClass, language;
FROM M2HM IMPORT
Item, ItemMode, maxLev;
FROM M2OMF IMPORT NewLabel, FixLabel, GenData, PutByte, NewSegmentHeader,
objFile, GenDS, EndSegment, aSegmentKind, aSegmentAttribute, CloseOMFFile,
aSegmentAttributeSet, ReferenceLabel, PutLong, GenLocalOp, PutWord,
OpenNewOMFFile, PutByteConstant, PutWordConstant, PutLongConstant,
IncrementSegmentLength, LabelDisplacement, GenGlobalOp;
FROM M2Shell IMPORT
KeepObject, SaveToDisk, userHasAborted, objectFileInError;
FROM M2SM IMPORT
Mark, IdBuf, Diff, scanerr, FindModule, aDirective, Directives;
FROM M2TM IMPORT
FindInScope;
FROM NumberConversion IMPORT
CardToString, NumToString;
FROM Storage IMPORT
ALLOCATE, DEALLOCATE;
FROM Strings IMPORT
Assign, Concat, Length, Insert;
FROM SYSTEM IMPORT
BYTE, WORD, TSIZE, ADR;
FROM W65C816 IMPORT
BRA, BRL;
IMPORT SYSTEM;
CONST
MaxCodeSize = 65535;
MaxStringLength = 255;
TYPE
pStringListEntry = POINTER TO aStringListEntry;
aStringListEntry =
RECORD
nextString: pStringListEntry;
theString: ARRAY [0..MaxStringLength-1] OF CHAR;
labelNumber: CARDINAL;
END;
pGlobalVarListEntry = POINTER TO aGlobalVarListEntry;
aGlobalVarListEntry =
RECORD
nextGlobal: pGlobalVarListEntry;
theGlobal: ObjPtr;
END;
pLinkListEntry = POINTER TO aLinkListEntry;
aLinkListEntry =
RECORD
nextLink: pLinkListEntry;
link: CARDINAL;
END;
pListOfLinks = POINTER TO aListOfLinks;
aListOfLinks =
RECORD
nextList: pListOfLinks;
links: pLinkListEntry;
END;
VAR
globalList: pGlobalVarListEntry;
globalSize: LONGINT;
ConvStr: ARRAY [0..15] OF CHAR;
listOfLinks: pListOfLinks;
PROCEDURE getLabelText( labelNumber: CARDINAL;
labelType: ARRAY OF CHAR;
VAR labelText: aSymbol);
(*
OPERATION:
Will produce a label consisting of the string in labelType, followed by
the string representation of labelNumber.
For example, if labelNumber = 2, and labelType = "_Loc", then the resulting
labelText will be "_Loc2".
*)
VAR
number: ARRAY [0..3] OF CHAR;
BEGIN
CardToString(labelNumber, number, 4);
Concat(labelType, number, labelText);
END getLabelText;
PROCEDURE IdToSymbol(id: WORD; VAR theSymbol: aSymbol);
(*
PROCEDURE:
Will convert an id in the symbol table to a symbol string for further
manipulation.
*)
VAR
i,L, ID: CARDINAL;
BEGIN
i := 0;
ID := VAL(CARDINAL, id);
L := ORD(IdBuf[ID]) - 1;
IF L > aSymbolLength THEN
L := aSymbolLength;
Mark(300);
END;
INC(ID);
REPEAT
theSymbol[i] := IdBuf[ID];
INC(i);
INC(ID);
DEC(L);
UNTIL L = 0;
IF i < aSymbolLength THEN
theSymbol[i] := 0C;
END;
END IdToSymbol;
PROCEDURE GetModuleNameByPtr(x: ObjPtr; VAR modName: aSymbol);
(*
OPERATION:
Retrieves a full module name. For use when allowing for local modules.
*)
VAR
nextPart: aSymbol;
mod: ObjPtr;
done: BOOLEAN;
BEGIN
mod := x;
modName := '';
done := FALSE;
WHILE NOT done DO
IdToSymbol(mod^.name, nextPart);
Concat(nextPart, modName, modName);
mod := mod^.parent;
IF mod <> NIL THEN
Concat('_', modName, modName);
ELSE
done := TRUE;
END;
END;
END GetModuleNameByPtr;
PROCEDURE GetModuleKey(mno: CARDINAL; VAR theKey: aSymbol; VAR OK: BOOLEAN);
(*
OPERATION:
Returns the textual key used by the compiler for link time version
checking.
*)
PROCEDURE KeyToString(key: KeyPtr; VAR string: ARRAY OF CHAR);
VAR
number: ARRAY [0..5] OF CHAR;
BEGIN
NumToString(key^.k0, 16, string, 4);
NumToString(key^.k1, 16, number, 4);
Concat(string, number, string);
NumToString(key^.k2, 16, number, 4);
Concat(string, number, string);
Concat('__', string, string);
END KeyToString;
VAR
name: CARDINAL;
obj: ObjPtr;
intobj: ObjPtr;
Found: BOOLEAN;
BEGIN
(*
FindModule searches the list of top-level modules for the desired
module.
*)
FindModule(mno, obj);
OK := TRUE;
IF obj = NIL THEN
(*
If the module is not in the top-level list, it may still exist as
a part of the scope of the main module. If so, then the module is
probably one that was imported as a result of importing a top-level
module.
If we find it in this search, return it's key, but also set OK to
false so that the caller knows that it shouldn't have access to this
module.
If we don't find it, then it is an error!
*)
obj := mainmod;
Found := FALSE;
WHILE NOT Found AND (obj <> NIL) AND OK DO
IF obj^.modno = mno THEN
Found := TRUE;
OK := FALSE;
END;
IF NOT Found THEN
obj := obj^.next;
END;
END;
IF NOT Found THEN
HALT;
ELSE
KeyToString(obj^.key, theKey);
END;
ELSE
(*
We must check to see if the module is an interface module that has
no implementation.
Such a module would be an imported module.
*)
intobj := mainmod;
Found := FALSE;
WHILE NOT Found AND (intobj <> NIL) DO
IF Diff(intobj^.name, obj^.name) = 0 THEN
Found := TRUE;
ELSE
intobj := intobj^.next;
END;
END;
IF intobj <> NIL THEN
IF intobj^.isInt THEN
OK := FALSE;
END;
END;
KeyToString(obj^.key, theKey);
END;
END GetModuleKey;
PROCEDURE GetModuleName(mno: CARDINAL; VAR theName: aSymbol; VAR OK: BOOLEAN);
(*
OPERATION:
Will get the specified module name and return it to the caller.
*)
VAR
name: CARDINAL;
obj: ObjPtr;
intobj: ObjPtr;
Found: BOOLEAN;
BEGIN
IF mno = 0FFFFH THEN
Assign('SYSTEM', theName);
ELSE
(*
FindModule searches the list of top-level modules for the desired
module.
*)
FindModule(mno, obj);
OK := TRUE;
IF obj = NIL THEN
(*
If the module is not in the top-level list, it may still exist as
a part of the scope of the main module. If so, then the module is
probably one that was imported as a result of importing a top-level
module.
If we find it in this search, return it's name, but also set OK to
false so that the caller knows that it shouldn't have access to this
module.
If we don't find it, then it is an error!
*)
obj := mainmod;
Found := FALSE;
WHILE NOT Found AND (obj <> NIL) AND OK DO
IF obj^.modno = mno THEN
Found := TRUE;
OK := FALSE;
END;
IF NOT Found THEN
obj := obj^.next;
END;
END;
IF NOT Found THEN
HALT;
ELSE
GetModuleNameByPtr(obj, theName);
END;
ELSE
(*
We must check to see if the module is an interface module that has
no implementation.
Such a module would be an imported module.
*)
intobj := mainmod;
Found := FALSE;
WHILE NOT Found AND (intobj <> NIL) DO
IF Diff(intobj^.name, obj^.name) = 0 THEN
Found := TRUE;
ELSE
intobj := intobj^.next;
END;
END;
IF intobj <> NIL THEN
IF intobj^.isInt THEN
OK := FALSE;
END;
END;
GetModuleNameByPtr(obj, theName);
END;
END;
END GetModuleName;
PROCEDURE GetStringName( number: CARDINAL;
module: CARDINAL;
level: CARDINAL;
VAR theLabel: aSymbol);
(*
OPERATION:
Will return the name of the specified string.
*)
VAR
moduleName: aSymbol;
OK: BOOLEAN;
BEGIN
getLabelText(number, '__String', theLabel);
IF level = 0 THEN
GetModuleName(module, moduleName, OK);
Concat(moduleName, theLabel, theLabel);
END;
END GetStringName;
PROCEDURE GetProcedureName(VAR x: ObjPtr; VAR procName: aSymbol);
(*
OPERATION:
Will get both the module and procedure name of the specified object.
These are concatenated to form one name, and that is returned.
*)
VAR
nextPart: aSymbol;
OK: BOOLEAN;
proc: ObjPtr;
done: BOOLEAN;
complete: BOOLEAN;
index: CARDINAL;
BEGIN
proc := x;
procName := '';
complete := FALSE;
done := FALSE;
WHILE NOT done DO
IdToSymbol(proc^.name, nextPart);
Concat(nextPart, procName, procName);
IF proc^.procType = pascal THEN
done := TRUE;
complete := TRUE;
index := Length(procName) + 1;
REPEAT
DEC(index);
procName[index] := CAP(procName[index]);
UNTIL index = 0;
ELSIF (proc^.class = Proc) AND
(proc^.parent = NIL) THEN (* exported from THIS module *)
done := TRUE;
ELSE
proc := proc^.parent;
IF proc <> NIL THEN
Concat('_', procName, procName);
ELSE
done := TRUE;
complete := TRUE;
END;
END;
END;
IF NOT complete THEN
GetModuleName(x^.pmod, nextPart, OK);
Concat('_', procName, procName);
Concat(nextPart, procName, procName);
END;
END GetProcedureName;
PROCEDURE GetVariableName(VAR x: Item; VAR varName: aSymbol);
(*
OPERATION:
Returns the full name of the variable (module_variable).
*)
VAR
proc: ObjPtr;
done: BOOLEAN;
variablePart: aSymbol;
OK: BOOLEAN;
complete: BOOLEAN;
BEGIN
proc := x.parent;
varName := '';
done := proc = NIL;
complete := FALSE;
WHILE NOT done DO
IdToSymbol(proc^.name, variablePart);
Concat(variablePart, varName, varName);
proc := proc^.parent;
IF proc <> NIL THEN
Concat('_', varName, varName);
ELSE
done := TRUE;
complete := TRUE;
END;
END;
IF NOT complete THEN
GetModuleName(x.mod, varName, OK);
END;
IF x.mode = conMd THEN
(*
### M2LM.GetVariableName:variable is a constant
*)
Mark(408);
ELSE
IdToSymbol(x.name, variablePart);
Concat(varName, "_", varName);
Concat(varName, variablePart, varName);
END;
END GetVariableName;
PROCEDURE AddBytesToObjectFile(codeSize: CARDINAL);
(*
OPERATION:
Will increment the size of the current level zero procedure, as well as
the entire object file being produced.
It then checks to see if the current procedure length has exceeded 64K,
which is the maximum size for any GSOS segment.
*)
BEGIN
pc := pc + codeSize;
objectCodeSize := objectCodeSize + VAL(LONGINT, codeSize);
IncrementSegmentLength(codeSize);
END AddBytesToObjectFile;
PROCEDURE newStringListEntry(VAR list: pStringListEntry;
VAR number: CARDINAL;
isGlobal: BOOLEAN): pStringListEntry;
(*
OPERATION:
Will allocate a new StringListEntry, and place it at the end of the list.
The address of the entry is returned to the caller.
*)
VAR
curEntry: pStringListEntry;
BEGIN
IF isGlobal THEN
number := 0;
ELSE
NewLabel(number);
END;
IF list = NIL THEN
ALLOCATE(list, TSIZE(aStringListEntry));
WITH list^ DO
nextString := NIL;
theString := '';
labelNumber := number;
END;
RETURN list;
ELSE
IF isGlobal THEN
INC(number);
END;
curEntry := list;
WHILE curEntry^.nextString <> NIL DO
curEntry := curEntry^.nextString;
IF isGlobal THEN
INC(number);
END;
END;
ALLOCATE(curEntry^.nextString, TSIZE(aStringListEntry));
WITH curEntry^.nextString^ DO
nextString := NIL;
theString := '';
labelNumber := number;
END;
RETURN curEntry^.nextString;
END;
END newStringListEntry;
PROCEDURE clearStringList(VAR list: pStringListEntry);
(*
OPERATION:
Clears out the list of string constants. This will normally be called at
the end of the production of a procedures code.
*)
VAR
curEntry: pStringListEntry;
nextEntry: pStringListEntry;
BEGIN
IF list <> NIL THEN
curEntry := list;
nextEntry := curEntry^.nextString;
WHILE nextEntry <> NIL DO
DEALLOCATE(curEntry, TSIZE(aStringListEntry));
curEntry := nextEntry;
nextEntry := curEntry^.nextString;
END;
DEALLOCATE(curEntry, TSIZE(aStringListEntry));
list := NIL;
END;
END clearStringList;
PROCEDURE AllocString(VAR list: pStringListEntry;
pos: CARDINAL;
VAR number: CARDINAL;
VAR length: CARDINAL);
(*
OPERATION:
Will create a new string constant for the current code segment.
*)
VAR
stringEntry: pStringListEntry;
i, L: CARDINAL;
global: BOOLEAN;
BEGIN
global := ADR(list) = ADR(globalStringList);
stringEntry := newStringListEntry(list, number, global);
WITH stringEntry^ DO
L := ORD(IdBuf[pos]) - 1;
IF L > MaxStringLength THEN
L := MaxStringLength;
Mark(301);
END;
length := L + 1;
INC(pos);
i := 0;
WHILE L > 0 DO
theString[i] := IdBuf[pos];
INC(i);
INC(pos);
DEC(L);
END;
IF i < MaxStringLength THEN
theString[i] := 0C;
END;
END;
END AllocString;
PROCEDURE AllocPString(VAR list: pStringListEntry;
str: ARRAY OF CHAR;
VAR number: CARDINAL;
VAR length: CARDINAL);
(*
OPERATION:
Will create a new "pascal" string constant for the current code segment.
*)
VAR
stringEntry: pStringListEntry;
global: BOOLEAN;
lengthChar: ARRAY [0..0] OF CHAR;
BEGIN
global := ADR(list) = ADR(globalStringList);
stringEntry := newStringListEntry(list, number, global);
WITH stringEntry^ DO
length := Length(str);
IF length > MaxStringLength THEN
length := MaxStringLength;
Mark(301);
END;
lengthChar[0] := VAL(CHAR, length);
Assign(str, theString);
Insert(lengthChar, theString, 0);
END;
END AllocPString;
PROCEDURE AllocCString(VAR list: pStringListEntry;
str: ARRAY OF CHAR;
VAR number: CARDINAL;
VAR length: CARDINAL);
(*
OPERATION:
Will create a new "C" string constant for the current code segment.
*)
VAR
stringEntry: pStringListEntry;
global: BOOLEAN;
BEGIN
global := ADR(list) = ADR(globalStringList);
stringEntry := newStringListEntry(list, number, global);
WITH stringEntry^ DO
length := Length(str);
IF length > MaxStringLength THEN
length := MaxStringLength;
Mark(301);
END;
Assign(str, theString);
END;
END AllocCString;
PROCEDURE AllocChar(VAR list: pStringListEntry;
ch: CHAR;
VAR number: CARDINAL;
VAR length: CARDINAL);
(*
OPERATION:
Will create a new string constant for the current code segment.
*)
VAR
stringEntry: pStringListEntry;
global: BOOLEAN;
BEGIN
global := ADR(list) = ADR(globalStringList);
stringEntry := newStringListEntry(list, number, global);
WITH stringEntry^ DO
length := 2;
theString[0] := ch;
theString[1] := 0C;
END;
END AllocChar;
PROCEDURE AllocBounds(min, max: INTEGER; size: CARDINAL; VAR adr: aAdr);
(* allocate the bounds of a subrange or index. *)
BEGIN
adr := 0 (* signal NO bound-pair allocated! *)
END AllocBounds;
PROCEDURE PutStringConstants(VAR list: pStringListEntry);
(*
OPERATION:
Will write to the object file, the list of string constants that has been
declared for the current code segment.
*)
VAR
theLine: ARRAY [0..255] OF CHAR;
theLabel: aSymbol;
moduleName: aSymbol;
curEntry: pStringListEntry;
isGlobal: BOOLEAN;
level: CARDINAL;
ci: CARDINAL;
len: CARDINAL;
BEGIN
curEntry := list;
isGlobal := (ADR(list) = ADR(globalStringList));
WHILE curEntry <> NIL DO
IF isGlobal THEN
WITH curEntry^ DO
GetStringName(labelNumber, mainmod^.modno, 0, theLabel);
Assign(theString, theLine);
GenData(theLabel, ADR(theLine), Length(theLine)+1, TRUE);
objectDataSize := objectDataSize + VAL(LONGINT, Length(theLine)+1);
IncrementSegmentLength(Length(theLine)+1);
END;
ELSE
WITH curEntry^ DO
FixLabel(labelNumber); (* labelNumber is field in curEntry^ *)
len := Length(theString);
IF len <> 0 THEN
FOR ci := 0 TO len-1 DO
PutByteConstant(VAL(BYTE, theString[ci]));
END;
END;
PutByteConstant(VAL(BYTE, 0)); (* Terminate the string *)
AddBytesToObjectFile(len+1);
END;
END;
curEntry := curEntry^.nextString;
END;
END PutStringConstants;
PROCEDURE newGlobalListEntry(): pGlobalVarListEntry;
(*
OPERATION:
Will allocate a new GlobalListEntry, and place it at the end of the list.
The address of the entry is returned to the caller.
*)
VAR
curEntry: pGlobalVarListEntry;
BEGIN
IF globalList = NIL THEN
ALLOCATE(globalList, TSIZE(aGlobalVarListEntry));
WITH globalList^ DO
nextGlobal := NIL;
theGlobal := NIL;
END;
RETURN globalList;
ELSE
curEntry := globalList;
WHILE curEntry^.nextGlobal <> NIL DO
curEntry := curEntry^.nextGlobal;
END;
ALLOCATE(curEntry^.nextGlobal, TSIZE(aGlobalVarListEntry));
WITH curEntry^.nextGlobal^ DO
nextGlobal := NIL;
theGlobal := NIL;
END;
RETURN curEntry^.nextGlobal;
END;
END newGlobalListEntry;
PROCEDURE clearGlobalList;
(*
OPERATION:
Clears out the list of Global variables. This will normally be called at
the end of the production of a modules.
*)
VAR
curEntry: pGlobalVarListEntry;
nextEntry: pGlobalVarListEntry;
BEGIN
IF globalList <> NIL THEN
curEntry := globalList;
nextEntry := curEntry^.nextGlobal;
WHILE nextEntry <> NIL DO
DEALLOCATE(curEntry, TSIZE(aGlobalVarListEntry));
curEntry := nextEntry;
nextEntry := curEntry^.nextGlobal;
END;
DEALLOCATE(curEntry, TSIZE(aGlobalVarListEntry));
globalList := NIL;
END;
END clearGlobalList;
PROCEDURE AllocGlobalVar(theVar: ObjPtr);
(*
OPERATION:
Will create a new Global variable for the current module, adding it to
the list.
An example of a global variable name as placed in this list would be:
M2LM_AllocGlobalVar
*)
VAR
globalEntry: pGlobalVarListEntry;
pos: CARDINAL;
BEGIN
IF theVar^.vmod = mainmod^.modno THEN
globalEntry := newGlobalListEntry();
WITH globalEntry^ DO
theGlobal := theVar;
END;
globalSize := globalSize + VAL(LONGINT, theVar^.typ^.size);
END;
END AllocGlobalVar;
PROCEDURE PutGlobals(isImp: BOOLEAN);
(*
OPERATION:
Will write to the object file, the list of Globals and string constants that
has been declared for the current module. These globals will be placed in a
segment called ~GLOBALS.
*)
VAR
moduleName: aSymbol;
segmentName: aSymbol;
curEntry: pGlobalVarListEntry;
varName: aSymbol;
i: CARDINAL;
OK: BOOLEAN;
debstr: String255;
BEGIN
(*
We only bother generating a global data segment if:
1. There are global variables to be generated.
2. It is the main module being compiled.
*)
IF (globalList <> NIL) OR
(NOT isImp) THEN
(*
globalList is not empty, so place any globals in the ~globals segment.
*)
curEntry := globalList;
IdToSymbol(mainmod^.name, moduleName);
IF isImp THEN
Concat(moduleName, '__Globals', segmentName);
ELSE
Concat("~", '__Globals', segmentName);
END;
NewSegmentHeader(segmentName);
objFile.segmentHeader^.LOADNAME := '~globals ';
objFile.segmentHeader^.BANKSIZE := 0;
WHILE curEntry <> NIL DO
WITH curEntry^ DO
IF theGlobal^.parent = NIL THEN
IdToSymbol(mainmod^.name, moduleName);
ELSE
GetModuleNameByPtr(theGlobal^.parent, moduleName);
END;
IdToSymbol(theGlobal^.name, varName);
Concat('_', varName, varName);
Concat(moduleName, varName, varName);
GenDS(varName, theGlobal^.typ^.size, NOT theGlobal^.exported);
objectDataSize := objectDataSize + theGlobal^.typ^.size;
IncrementSegmentLength(theGlobal^.typ^.size);
END;
curEntry := curEntry^.nextGlobal;
END;
EndSegment(skData, aSegmentAttributeSet{});
END; (* globalList is not empty *)
IF globalStringList <> NIL THEN
(*
Strings defined at the global level are placed in the ~arrays segment,
but only if some exist. There's no need to create an empty segment.
*)
IdToSymbol(mainmod^.name, moduleName);
IF isImp THEN
Concat(moduleName, '__Arrays', segmentName);
ELSE
Concat("~", '__Arrays', segmentName);
END;
NewSegmentHeader(segmentName);
objFile.segmentHeader^.LOADNAME := '~arrays ';
objFile.segmentHeader^.BANKSIZE := 0;
PutStringConstants(globalStringList);
EndSegment(skData, aSegmentAttributeSet{});
END;
END PutGlobals;
PROCEDURE ClearLink(link: pLinkListEntry);
VAR
prevLink: pLinkListEntry;
BEGIN
WHILE link <> NIL DO
prevLink := link;
link := link^.nextLink;
DEALLOCATE(prevLink, TSIZE(aLinkListEntry));
END;
END ClearLink;
PROCEDURE clearListOfLinks;
VAR
curList: pListOfLinks;
prevList: pListOfLinks;
BEGIN
curList := listOfLinks;
WHILE curList <> NIL DO
ClearLink(curList^.links);
prevList := curList;
curList := curList^.nextList;
DEALLOCATE(prevList, TSIZE(aListOfLinks));
END;
listOfLinks := NIL;
END clearListOfLinks;
PROCEDURE linkPresent(list: pLinkListEntry; L: CARDINAL): BOOLEAN;
BEGIN
IF list = NIL THEN
RETURN FALSE;
ELSE
WHILE list <> NIL DO
IF list^.link = L THEN
RETURN TRUE;
ELSE
list := list^.nextLink;
END;
END;
RETURN FALSE;
END;
END linkPresent;
PROCEDURE MergedLinks(L0, L1: CARDINAL): CARDINAL;
VAR
curList: pListOfLinks;
Found: BOOLEAN;
PROCEDURE AddToLinks(VAR list: pLinkListEntry; L: CARDINAL);
VAR
alreadyPresent: BOOLEAN;
endOfList: BOOLEAN;
BEGIN
IF list = NIL THEN
ALLOCATE(list, TSIZE(aLinkListEntry));
list^.nextLink := NIL;
list^.link := L;
ELSE
alreadyPresent := FALSE;
endOfList := FALSE;
WHILE (NOT endOfList) AND (NOT alreadyPresent) DO
IF list^.link = L THEN
alreadyPresent := TRUE;
ELSE
IF list^.nextLink = NIL THEN
endOfList := TRUE;
ELSE
list := list^.nextLink;
END;
END;
END;
IF NOT alreadyPresent THEN
ALLOCATE(list^.nextLink, TSIZE(aLinkListEntry));
WITH list^.nextLink^ DO
nextLink := NIL;
link := L;
END;
END;
END;
END AddToLinks;
BEGIN
IF L0 <> 0 THEN
IF listOfLinks <> NIL THEN
curList := listOfLinks;
Found := FALSE;
WHILE (curList <> NIL) AND
(NOT Found) DO
IF linkPresent(curList^.links, L0) THEN
Found := TRUE;
AddToLinks(curList^.links, L1);
ELSIF linkPresent(curList^.links, L1) THEN