DIRECTORY Basics, Rope, RopeFile, Finalize, FinalizeOps, VM, UnixSysCallExtensions, Commander, IO;

RopeFileImpl: CEDAR MONITOR
IMPORTS Rope, Finalize, FinalizeOps, VM, UnixSysCallExtensions, Commander, IO
EXPORTS RopeFile
SHARES Rope
~ BEGIN

ROPE: TYPE ~ Rope.ROPE;
ByteSequenceObject: TYPE ~ RopeFile.ByteSequenceObject;
DeactivateResult: TYPE ~ RopeFile.DeactivateResult;

Error: PUBLIC ERROR [ec: ATOM, explanation: ROPE] ~ CODE;

bufferSize: NAT ~ 8192;

Buffer: TYPE ~ REF BufferRep;
BufferRep: TYPE ~ RECORD [
byteSequenceObject: ByteSequenceObject,
start: INT,
end: INT,
chars: POINTER TO Basics.RawBytes,
interval: VM.Interval,
rest: REF BufferRep
];

NewBuffer: PROC RETURNS [Buffer] ~ {
interval: VM.Interval ~ VM.SimpleAllocate[VM.PagesForBytes[bufferSize]];
buffer: Buffer ~ NEW[BufferRep];
buffer.interval ¬ interval;
buffer.chars ¬ LOOPHOLE[VM.AddressForPageNumber[interval.page]];
[] ¬ FinalizeOps.EnableFinalization[buffer, finalizationQueue];
RETURN [buffer]
};

maxSmallBlock: NAT ¬ 2*bufferSize;
maxTextSize: NAT ~ NAT15.LAST+1-BYTES[TEXT[0]]-8;
flatTrigger1: NAT ¬ MIN[bufferSize*4, maxTextSize];
flatTrigger2: NAT ¬ flatTrigger1;

filesMaxLimit: NAT = UnixSysCallExtensions.GetDTableSize1[std];
filesMax: NAT ¬ MAX[filesMaxLimit/4, 1];

bufferLimit: NAT ¬ filesMax;

Flattery: PROC [byteSequenceObject: ByteSequenceObject, start: CARD, len: CARD] RETURNS [ROPE] = TRUSTED {
SELECT len FROM
<= flatTrigger1 => {
text: Rope.Text ¬ Rope.NewText[len];
TRUSTED {
[] ¬ byteSequenceObject.move[byteSequenceObject, [base: LOOPHOLE[text], startIndex: BYTES[TEXT[0]], count: len], start];
};
RETURN [text];
};
ENDCASE => {
half: INT = (len - len MOD 16) / 2;
ret: ROPE = Flattery[byteSequenceObject, start, half];  -- preferred evaluation order
start ¬ start + half;
len ¬ len - half;
RETURN [Rope.Concat[ret, Flattery[byteSequenceObject, start, len]]];
};
};

CreateByteSequenceObject: PUBLIC PROC [
length: [0..LAST[INT]],
data: REF ANY,
equal: PROC [self: ByteSequenceObject, other: ByteSequenceObject] RETURNS [BOOL],
deactivate: PROC [self: ByteSequenceObject, final: BOOL] RETURNS [DeactivateResult],
describe: PROC [self: ByteSequenceObject]
	RETURNS [fileName: ROPE, created: ROPE, open: BOOL],
move: UNSAFE PROC [self: ByteSequenceObject, block: Basics.UnsafeBlock, start: INT] RETURNS [charsMoved: INT ¬ 0]] RETURNS [ByteSequenceObject] ~ {
byteSequenceObject: ByteSequenceObject ~ NEW[RopeFile.ByteSequenceObjectRep ¬ [length: length, data: data, equal: equal, deactivate: deactivate, describe: describe, move: move]];
[] ¬ FinalizeOps.EnableFinalization[byteSequenceObject, finalizationQueue];
RETURN [byteSequenceObject]
};

FromByteSequenceObject: PUBLIC PROC [byteSequenceObject: ByteSequenceObject, flatten: BOOL ¬ FALSE] RETURNS [rope: ROPE] ~ {
length: NAT ~ byteSequenceObject.length;
IF flatten OR length <= flatTrigger2
THEN {
rope ¬ Flattery[byteSequenceObject, 0, length];
[] ¬ byteSequenceObject.deactivate[byteSequenceObject, FALSE];
}
ELSE {
rope ¬ FindOld[byteSequenceObject];
IF rope = NIL THEN {
rope ¬ Rope.MakeRope[byteSequenceObject, byteSequenceObject.length, RopeFileFetch, RopeFileMap, RopeFileMove];
Note[rope];
};
};
};

head: LIST OF Finalize.Handle ¬ LIST[NIL];
Note: ENTRY PROC [rope: ROPE] ~ {
handle: Finalize.Handle ~ FinalizeOps.EnableFinalization[rope, finalizationQueue];
head.rest ¬ CONS[handle, head.rest];
};

Touch: ENTRY PROC [byteSequenceObject: ByteSequenceObject] ~ {
prev: LIST OF Finalize.Handle ¬ head;
FOR tail: LIST OF Finalize.Handle ¬ head.rest, tail.rest UNTIL tail = NIL DO
WITH Finalize.HandleToObject[tail.first] SELECT FROM
object: REF Rope.RopeRep.node.object => {
IF object.base = byteSequenceObject THEN {
prev.rest ¬ tail.rest;
tail.rest ¬ head.rest;
head.rest ¬ tail;
RETURN
};
};
ENDCASE;
prev ¬ tail;
ENDLOOP;
};

Remove: ENTRY PROC [handle: Finalize.Handle] ~ {
prev: LIST OF Finalize.Handle ¬ head;
FOR tail: LIST OF Finalize.Handle ¬ head.rest, tail.rest UNTIL tail = NIL DO
IF tail.first = handle THEN { prev.rest ¬ tail.rest; tail.rest ¬ NIL; RETURN };
prev ¬ tail;
ENDLOOP;
};

FindOld: ENTRY PROC [byteSequenceObject: ByteSequenceObject] RETURNS [ROPE ¬ NIL] ~ {
FOR tail: LIST OF Finalize.Handle ¬ head.rest, tail.rest UNTIL tail = NIL DO
WITH Finalize.HandleToObject[tail.first] SELECT FROM
rope: REF Rope.RopeRep.node.object => {
IF rope.size = byteSequenceObject.length THEN {
WITH rope.base SELECT FROM
other: ByteSequenceObject => {
IF byteSequenceObject.equal = other.equal AND byteSequenceObject.equal[byteSequenceObject, other] THEN RETURN [rope]
}
ENDCASE
}
}
ENDCASE
ENDLOOP
};

GetDeactivationTargets: ENTRY PROC [activeLimit: INT] RETURNS [list: LIST OF ByteSequenceObject ¬ NIL] ~ {
FOR tail: LIST OF Finalize.Handle ¬ head.rest, tail.rest UNTIL tail = NIL DO
WITH Finalize.HandleToObject[tail.first] SELECT FROM
object: REF Rope.RopeRep.node.object => {
WITH object.base SELECT FROM
byteSequenceObject: ByteSequenceObject => {
IF byteSequenceObject.describe[byteSequenceObject].open THEN {
IF activeLimit > 0
THEN activeLimit ¬ activeLimit - 1
ELSE list ¬ CONS[byteSequenceObject, list];
};
};
ENDCASE;
};
ENDCASE;
ENDLOOP;
};

GetObjectList: ENTRY PROC RETURNS [list: LIST OF ByteSequenceObject ¬ NIL] ~ {
FOR tail: LIST OF Finalize.Handle ¬ head.rest, tail.rest UNTIL tail = NIL DO
WITH Finalize.HandleToObject[tail.first] SELECT FROM
object: REF Rope.RopeRep.node.object => {
WITH object.base SELECT FROM
byteSequenceObject: ByteSequenceObject => {
list ¬ CONS[byteSequenceObject, list];
};
ENDCASE;
};
ENDCASE;
ENDLOOP;
};

LimitActive: PUBLIC PROC [activeLimit: INT] ~ {
next: LIST OF ByteSequenceObject ¬ NIL;
FOR list: LIST OF ByteSequenceObject ¬ GetDeactivationTargets[activeLimit], next UNTIL list = NIL DO
byteSequenceObject: ByteSequenceObject ~ list.first;
list.first ¬ NIL;
next ¬ list.rest;
list.rest ¬ NIL;
[] ¬ byteSequenceObject.deactivate[byteSequenceObject, FALSE];
ENDLOOP;
};

RopeFileFetch: Rope.FetchType ~ {
byteSequenceObject: ByteSequenceObject ~ NARROW[data];
buffer: Buffer ~ ObtainBuffer[byteSequenceObject, index];
char: CHAR;
TRUSTED { char ¬ VAL[buffer.chars[index-buffer.start]] };
ReleaseBuffer[byteSequenceObject, buffer];
RETURN [char]
};

RopeFileMap: Rope.MapType ~ {
byteSequenceObject: ByteSequenceObject ~ NARROW[base];
buffer: Buffer ¬ ObtainBuffer[byteSequenceObject, start];
BEGIN ENABLE UNWIND => { ReleaseBuffer[byteSequenceObject, buffer] };
FOR i: INT IN [start..start+len) UNTIL quit DO
IF i >= buffer.end THEN {
ReleaseBuffer[byteSequenceObject, buffer];
buffer ¬ ObtainBuffer[byteSequenceObject, i];
};
TRUSTED { quit ¬ action[VAL[buffer.chars[i-buffer.start]]] };
ENDLOOP;
END;
ReleaseBuffer[byteSequenceObject, buffer];
};

RopeFileMove: Rope.MoveType ~ UNCHECKED {
byteSequenceObject: ByteSequenceObject ~ NARROW[data];
MoveDataFromBuffer: UNSAFE PROC [buffer: Buffer] ~ INLINE {
transfer: INT ~ MIN[INT[block.count], buffer.end-start];
Basics.MoveBytes[dstBase: block.base, dstStart: block.startIndex, 
srcBase: buffer.chars, srcStart: start-buffer.start, 
count: transfer];
block.startIndex ¬ block.startIndex + transfer;
block.count ¬ block.count - transfer;
start ¬ start + transfer;
charsMoved ¬ charsMoved + transfer;
ReleaseBuffer[byteSequenceObject, buffer];
};
IF block.count >= bufferSize THEN {
wasAlreadyActive: BOOL ~ byteSequenceObject.describe[byteSequenceObject].open;
buffer: Buffer ~ FindBuffer[byteSequenceObject, start, TRUE]; -- use buffered data if we happen to have it.
IF buffer # NIL THEN { MoveDataFromBuffer[buffer] };
UNCHECKED {
moved: INT ¬ byteSequenceObject.move[byteSequenceObject, [base: block.base, startIndex: block.startIndex, count: block.count], start];
block.startIndex ¬ block.startIndex + moved;
block.count ¬ block.count - moved;
start ¬ start + moved;
charsMoved ¬ charsMoved + moved;
};
Touch[byteSequenceObject];
IF NOT wasAlreadyActive THEN LimitActive[filesMax];
};
UNTIL block.count = 0 DO
buffer: Buffer ~ ObtainBuffer[byteSequenceObject, start];
MoveDataFromBuffer[buffer];
ENDLOOP;
};

ObtainBuffer: PROC [byteSequenceObject: ByteSequenceObject, index: INT] RETURNS [buffer: Buffer] ~ {
buffer ¬ FindBuffer[byteSequenceObject, index];
IF buffer = NIL THEN buffer ¬ NewBuffer[];
IF NOT ((buffer.byteSequenceObject = byteSequenceObject) AND (index IN [buffer.start..buffer.end))) THEN {
wasAlreadyActive: BOOL ~ byteSequenceObject.describe[byteSequenceObject].open;
buffer.byteSequenceObject ¬ byteSequenceObject;
buffer.start ¬ (CARD[index] / bufferSize) * bufferSize;
buffer.end ¬ MIN[buffer.start + bufferSize, byteSequenceObject.length];
TRUSTED {
moved: INT ¬ byteSequenceObject.move[byteSequenceObject, [base: buffer.chars, startIndex: 0, count: buffer.end-buffer.start], buffer.start];
IF buffer.start+moved # buffer.end THEN Error[$BadMove, "RopeFileImpl: Failed to get expected amount of data"];
};
Touch[byteSequenceObject];
IF NOT wasAlreadyActive THEN LimitActive[filesMax];
};
};

bufferHead: Buffer ~ NEW[BufferRep];

FindBuffer: ENTRY PROC [byteSequenceObject: ByteSequenceObject, index: INT, exact: BOOL ¬ FALSE] RETURNS [Buffer] ~ {
nBuffers: INT ¬ 0;
prev: Buffer ¬ bufferHead;
prevPrev: Buffer ¬ NIL;
preTarget: Buffer ¬ NIL;
UNTIL prev.rest = NIL DO
this: Buffer ~ prev.rest;
IF this.byteSequenceObject = NIL THEN preTarget ¬ prev;
IF (this.byteSequenceObject = byteSequenceObject AND index IN [this.start..this.end)) THEN {
prev.rest ¬ prev.rest.rest;
this.rest ¬ NIL;
RETURN [this]
};
nBuffers ¬ nBuffers + 1;
prevPrev ¬ prev;
prev ¬ prev.rest;
ENDLOOP;
IF exact THEN RETURN [NIL];
IF preTarget # NIL THEN {
this: Buffer ~ preTarget.rest;
preTarget.rest ¬ preTarget.rest.rest;
this.rest ¬ NIL;
RETURN [this]
};
IF nBuffers < bufferLimit OR prevPrev = NIL THEN RETURN [NIL] ELSE {
this: Buffer ~ prev; -- least-recently used buffer.
prevPrev.rest ¬ NIL;
RETURN [this]
};
};

ReleaseBuffer: ENTRY PROC [byteSequenceObject: ByteSequenceObject, buffer: Buffer] ~ {
IF buffer.rest # NIL OR buffer.byteSequenceObject # byteSequenceObject THEN ERROR;
buffer.rest ¬ bufferHead.rest;
bufferHead.rest ¬ buffer;
};

finalizationQueue: FinalizeOps.CallQueue;	-- no forking for now
Finalizer: FinalizeOps.FinalizeProc ~ {
WITH object SELECT FROM
object: REF Rope.RopeRep.node.object => {
Remove[handle];
WITH object.base SELECT FROM
byteSequenceObject: ByteSequenceObject => {
KillBuffers[byteSequenceObject];
[] ¬ byteSequenceObject.deactivate[byteSequenceObject, FALSE];
}
ENDCASE
};
buffer: Buffer => {
buffer.chars ¬ NIL;
TRUSTED { VM.Free[buffer.interval] };
buffer.interval ¬ VM.nullInterval;
};
byteSequenceObject: ByteSequenceObject => {
[] ¬ byteSequenceObject.deactivate[byteSequenceObject, TRUE];
};
ENDCASE;
};

KillBuffers: ENTRY PROC [byteSequenceObject: ByteSequenceObject] ~ {
FOR buffer: Buffer ¬ bufferHead.rest, buffer.rest UNTIL buffer = NIL DO
IF buffer.byteSequenceObject = byteSequenceObject THEN buffer.byteSequenceObject ¬ NIL;
ENDLOOP;
};

Deactivate: PUBLIC PROC [rope: ROPE] ~ {
WITH rope SELECT FROM
x: REF Rope.RopeRep.node => TRUSTED {
WITH x: x SELECT FROM
substr => Deactivate[x.base];
concat => { Deactivate[x.base]; Deactivate[x.rest] };
replace => { Deactivate[x.base]; Deactivate[x.replace] };
object => IF x.fetch = RopeFileFetch THEN {
WITH x.base SELECT FROM
byteSequenceObject: ByteSequenceObject => {
[] ¬ byteSequenceObject.deactivate[byteSequenceObject, FALSE];
};
ENDCASE
};
ENDCASE
};
ENDCASE;
};

RopeFilesCommand: Commander.CommandProc ~ {
FOR tail: LIST OF ByteSequenceObject ¬ GetObjectList[], tail.rest UNTIL tail = NIL DO
byteSequenceObject: ByteSequenceObject ~ tail.first;
P: PROC [fileName: ROPE, created: ROPE, open: BOOL] ~ {
status: ROPE ~ IF open THEN "O" ELSE "X";
IO.PutFL[cmd.out, "%g\n %g %9d  %g\n", LIST[[rope[fileName]], [rope[status]], [integer[byteSequenceObject.length]], [rope[created]]]];
};
[] ¬ APPLY [P, byteSequenceObject.describe[byteSequenceObject]];
ENDLOOP;
};

Commander.Register["RopeFiles", RopeFilesCommand, "Lists the files currently in use as RopeFiles"];

END.
œ
RopeFileImpl.mesa
Copyright Σ 1985, 1986, 1987, 1988, 1991, 1992 by Xerox Corporation.  All rights reserved.
Doug Wyatt, February 6, 1987 6:01:58 pm PST
Carl Hauser, July 14, 1988 1:31:14 pm PDT
JKF August 29, 1988 11:36:43 am PDT
Russ Atkinson (RRA) October 5, 1988 8:07:25 pm PDT
Michael Plass, April 6, 1992 11:13 am PDT
Christian Jacobi, July 24, 1992 2:43 pm PDT
Willie-s, January 27, 1993 4:56 pm PST

To disable these UnsafeGetBlock calls, set maxSmallBlock to INT.LAST.

This rope should be made out of one flat piece
This rope should be made out of flat pieces
Moves to the front.
Searches for an extant rope that describes the same data.
PROC [data: REF, index: INT] RETURNS [CHAR]
PROC [base: REF, start, len: INT, action: ActionType] 
RETURNS [quit: BOOL ¬ FALSE]
UNSAFE PROC [block: UnsafeBlock, data: REF, start: INT] 
RETURNS [charsMoved: INT ¬ 0]
Must have start IN [buffer.start..buffer.end)
Bypass buffers on long requests.
Gets a buffer with valid data.
Tries to find a buffer with valid data; failing that, may return another buffer (unless exact=TRUE) or NIL.
Found an empty buffer; use it.
finalizationQueue: FinalizeOps.CallQueue = FinalizeOps.CreateCallQueue[Finalizer];

Note: since the rope might actually be passed out again after it has entered the finalization queue; we must stop short of breaking it entirely here.  We do not completely deactivate the byteSequenceObject until it is finalized.
These should get finalized only if a client dies with a buffer checked out.
Since we don't keep a table of FinalizeOps handles to these, we know that there are no references and we can fully deactivate.
Invalidates buffers for a rope that has been finalized.
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