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https://github.com/vishapoberon/compiler.git
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Integrate JTempl's new OFront heap implementation using unsigned address arithmetic.
This commit is contained in:
David Brown
parent
6f43c272c9
commit
43117e79f7
1 changed files with 87 additions and 95 deletions
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@ -8,7 +8,7 @@ MODULE Heap;
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CmdNameLen = 24;
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SZA = SIZE(S.ADDRESS); (* Size of address *)
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Unit = 4*SZA; (* smallest possible heap block *)
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nofLists = 9; (* number of free_lists *)
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nofLists = 9; (* number of freelist entries excluding sentinel *)
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heapSize0 = 8000*Unit; (* startup heap size *)
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(* all blocks look the same:
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@ -81,10 +81,8 @@ MODULE Heap;
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(* extensible heap *)
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heap-: S.ADDRESS; (* the sorted list of heap chunks *)
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heapNegMin: S.ADDRESS; (* Range of pointer values, used for stack collection *)
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heapNegMax: S.ADDRESS;
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heapPosMin: S.ADDRESS;
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heapPosMax: S.ADDRESS;
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heapMin: S.ADDRESS; (* Range of valid pointer values, used for stack collection *)
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heapMax: S.ADDRESS;
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heapsize*: S.ADDRESS; (* the sum of all heap chunk sizes *)
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(* finalization candidates *)
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@ -114,6 +112,9 @@ MODULE Heap;
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END Unlock;
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PROCEDURE -uLT(x, y: S.ADDRESS): BOOLEAN "((size_t)x < (size_t)y)";
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PROCEDURE -uLE(x, y: S.ADDRESS): BOOLEAN "((size_t)x <= (size_t)y)";
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(*
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PROCEDURE TAS*(VAR flag:BOOLEAN): BOOLEAN; (* added for compatibility with ulmSYSTEM module; noch *)
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VAR oldflag : BOOLEAN;
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@ -200,13 +201,8 @@ MODULE Heap;
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bigBlocks := blk; (* Prepend block to list of big blocks *)
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INC(heapsize, blksz);
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(* Maintain heap range limits *)
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IF chnk > 0 THEN
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IF chnk < heapPosMin THEN heapPosMin := blk + SZA END;
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IF end > heapPosMax THEN heapPosMax := end END
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ELSE (* chnk < 0 *)
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IF chnk < heapNegMin THEN heapNegMin := blk + SZA END;
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IF end > heapNegMax THEN heapNegMax := end END
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END
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IF uLT(blk + SZA, heapMin) THEN heapMin := blk + SZA END;
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IF uLT(heapMax, end) THEN heapMax := end END
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END;
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RETURN chnk
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END NewChunk;
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@ -214,17 +210,17 @@ MODULE Heap;
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PROCEDURE ExtendHeap(blksz: S.ADDRESS);
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VAR size, chnk, j, next: S.ADDRESS;
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BEGIN
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IF blksz > 10000*Unit THEN size := blksz
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IF uLT(10000*Unit, blksz) THEN size := blksz
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ELSE size := 10000*Unit (* additional heuristics *)
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END;
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chnk := NewChunk(size);
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IF chnk # 0 THEN
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(*sorted insertion*)
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IF chnk < heap THEN
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IF uLT(chnk, heap) THEN
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S.PUT(chnk, heap); heap := chnk
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ELSE
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j := heap; S.GET(j, next);
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WHILE (next # 0) & (chnk - next > 0) DO
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WHILE (next # 0) & uLT(next, chnk) DO
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j := next;
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S.GET(j, next)
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END;
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@ -248,13 +244,13 @@ MODULE Heap;
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ASSERT(blksz MOD Unit = 0);
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i0 := blksz DIV Unit; i := i0;
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IF i < nofLists THEN adr := freeList[i];
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IF uLT(i, nofLists) THEN adr := freeList[i];
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WHILE adr = 0 DO INC(i); adr := freeList[i] END
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END;
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IF i < nofLists THEN (* unlink *)
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IF uLT(i, nofLists) THEN (* Unlink from freelist[i] *)
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S.GET(adr + nextOff, next);
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freeList[i] := next;
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IF i # i0 THEN (* split *)
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IF i # i0 THEN (* Split *)
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di := i - i0; restsize := di * Unit; end := adr + restsize;
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S.PUT(end + sizeOff, blksz);
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S.PUT(end + sntlOff, NoPtrSntl);
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@ -264,14 +260,15 @@ MODULE Heap;
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freeList[di] := adr;
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INC(adr, restsize)
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END
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ELSE
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ELSE (* Search in bigBlocks *)
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adr := bigBlocks; prev := 0;
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LOOP
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IF adr = 0 THEN
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IF adr = 0 THEN (* Nothing free *)
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IF firstTry THEN
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GC(TRUE); INC(blksz, Unit);
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IF (heapsize - allocated - blksz) * 4 < heapsize THEN
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(* heap is still almost full; expand to avoid thrashing *)
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IF uLT(heapsize - allocated, blksz)
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OR uLT((heapsize - allocated - blksz) * 4, heapsize) THEN
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(* heap would still be more than 3/4 full; expand to avoid thrashing *)
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ExtendHeap((allocated + blksz) DIV (3*Unit) * (4*Unit) - heapsize)
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END;
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firstTry := FALSE; new := NEWREC(tag); firstTry := TRUE;
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@ -287,21 +284,21 @@ MODULE Heap;
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END
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END;
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S.GET(adr+sizeOff, t);
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IF t >= blksz THEN EXIT END ;
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IF uLE(blksz, t) THEN EXIT END;
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prev := adr; S.GET(adr + nextOff, adr)
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END;
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restsize := t - blksz; end := adr + restsize;
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S.PUT(end + sizeOff, blksz);
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S.PUT(end + sntlOff, NoPtrSntl);
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S.PUT(end, end + sizeOff);
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IF restsize > nofLists * Unit THEN (*resize*)
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IF uLT(nofLists * Unit, restsize) THEN (* Resize *)
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S.PUT(adr + sizeOff, restsize)
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ELSE (*unlink*)
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ELSE (* Unlink *)
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S.GET(adr + nextOff, next);
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IF prev = 0 THEN bigBlocks := next
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ELSE S.PUT(prev + nextOff, next);
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END;
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IF restsize > 0 THEN (*move*)
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IF restsize # 0 THEN (* Move *)
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di := restsize DIV Unit;
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S.PUT(adr + sizeOff, restsize);
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S.PUT(adr + nextOff, freeList[di]);
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@ -311,7 +308,7 @@ MODULE Heap;
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INC(adr, restsize)
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END;
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i := adr + 4*SZA; end := adr + blksz;
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WHILE end - i > 0 DO (*deliberately unrolled*)
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WHILE uLT(i, end) DO (* Deliberately unrolled *)
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S.PUT(i, AddressZero);
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S.PUT(i + SZA, AddressZero);
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S.PUT(i + 2*SZA, AddressZero);
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@ -393,16 +390,16 @@ MODULE Heap;
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WHILE chnk # 0 DO
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adr := chnk + blkOff;
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S.GET(chnk + endOff, end);
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WHILE end - adr > 0 DO
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WHILE uLT(adr, end) DO
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S.GET(adr, tag);
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IF ODD(tag) THEN (*marked*)
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IF freesize > 0 THEN
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IF ODD(tag) THEN (* Marked *)
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IF freesize # 0 THEN
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start := adr - freesize;
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S.PUT(start, start+SZA);
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S.PUT(start+sizeOff, freesize);
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S.PUT(start+sntlOff, NoPtrSntl);
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i := freesize DIV Unit; freesize := 0;
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IF i < nofLists THEN S.PUT(start + nextOff, freeList[i]); freeList[i] := start
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IF uLT(i, nofLists) THEN S.PUT(start + nextOff, freeList[i]); freeList[i] := start
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ELSE S.PUT(start + nextOff, bigBlocks); bigBlocks := start
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END
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END;
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@ -417,13 +414,13 @@ MODULE Heap;
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INC(adr, size)
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END
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END;
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IF freesize > 0 THEN (*collect last block*)
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IF freesize # 0 THEN (* Collect last block *)
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start := adr - freesize;
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S.PUT(start, start+SZA);
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S.PUT(start+sizeOff, freesize);
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S.PUT(start+sntlOff, NoPtrSntl);
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i := freesize DIV Unit; freesize := 0;
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IF i < nofLists THEN S.PUT(start + nextOff, freeList[i]); freeList[i] := start
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IF uLT(i, nofLists) THEN S.PUT(start + nextOff, freeList[i]); freeList[i] := start
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ELSE S.PUT(start + nextOff, bigBlocks); bigBlocks := start
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END
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END;
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@ -435,8 +432,8 @@ MODULE Heap;
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VAR i, j, x: S.ADDRESS;
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BEGIN j := l; x := a[j];
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LOOP i := j; j := 2*j + 1;
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IF (j < r) & (a[j] < a[j+1]) THEN INC(j) END;
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IF (j > r) OR (a[j] <= x) THEN EXIT END;
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IF (j < r) & uLT(a[j], a[j+1]) THEN INC(j) END;
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IF (j > r) OR uLE(a[j], x) THEN EXIT END;
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a[i] := a[j]
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END;
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a[i] := x
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@ -449,29 +446,27 @@ MODULE Heap;
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WHILE r > 0 DO x := a[0]; a[0] := a[r]; a[r] := x; DEC(r); Sift(l, r, a) END
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END HeapSort;
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PROCEDURE MarkCandidates(n: S.ADDRESS; VAR cand: ARRAY OF S.ADDRESS);
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VAR chnk, adr, tag, next, lim, lim1, i, ptr, size: S.ADDRESS;
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PROCEDURE MarkCandidates(n: LONGINT; VAR cand: ARRAY OF S.ADDRESS);
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VAR chnk, end, adr, tag, next, i, ptr, size: S.ADDRESS;
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BEGIN
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chnk := heap; i := 0; lim := cand[n-1];
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WHILE (chnk # 0 ) & (lim - chnk > 0) DO
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ASSERT(n > 0);
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chnk := heap; i := 0;
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WHILE chnk # 0 DO
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S.GET(chnk + endOff, end);
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adr := chnk + blkOff;
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S.GET(chnk + endOff, lim1);
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IF lim1 - lim > 0 THEN lim1 := lim END ;
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WHILE lim1 - adr > 0 DO
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WHILE uLT(adr, end) DO
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S.GET(adr, tag);
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IF ODD(tag) THEN (*already marked*)
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S.GET(tag-1, size); INC(adr, size)
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S.GET(tag-1, size); INC(adr, size); ptr := adr + SZA;
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WHILE uLT(cand[i], ptr) DO INC(i); IF i = n THEN RETURN END END ;
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ELSE
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S.GET(tag, size);
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ptr := adr + SZA;
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WHILE ptr - cand[i] > 0 DO INC(i) END ;
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IF i = n THEN RETURN END ;
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next := adr + size;
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IF next - cand[i] > 0 THEN Mark(ptr) END ;
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adr := next
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END
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S.GET(tag, size); ptr := adr + SZA; INC(adr, size);
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WHILE uLT(cand[i], ptr) DO INC(i); IF i = n THEN RETURN END END ;
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IF uLT(cand[i], adr) THEN Mark(ptr) END
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END ;
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S.GET(chnk, chnk)
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IF uLE(end, cand[i]) THEN (*skip rest of this heap chunk*) adr := end END
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END ;
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S.GET(chnk + nextChnkOff, chnk)
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END
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END MarkCandidates;
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@ -518,8 +513,8 @@ MODULE Heap;
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PROCEDURE MarkStack(n: S.ADDRESS; VAR cand: ARRAY OF S.ADDRESS);
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VAR
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frame: S.PTR;
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inc, nofcand: S.ADDRESS;
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sp, p, stack0: S.ADDRESS;
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nofcand: LONGINT;
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inc, sp, p, stack0: S.ADDRESS;
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align: RECORD ch: CHAR; p: S.PTR END;
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BEGIN
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IF n > 0 THEN MarkStack(n-1, cand); (* flush register windows by means of recursive calls *)
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@ -530,11 +525,10 @@ MODULE Heap;
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stack0 := ModulesMainStackFrame();
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(* check for minimum alignment of pointers *)
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inc := S.ADR(align.p) - S.ADR(align);
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IF sp - stack0 > 0 THEN inc := -inc END ;
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IF uLT(stack0, sp) THEN inc := -inc END;
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WHILE sp # stack0 DO
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S.GET(sp, p);
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IF (p > 0) & (p >= heapPosMin) & (p < heapPosMax)
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OR (p < 0) & (p >= heapNegMin) & (p < heapNegMax) THEN
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IF uLE(heapMin, p) & uLT(p, heapMax) THEN
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IF nofcand = LEN(cand) THEN HeapSort(nofcand, cand); MarkCandidates(nofcand, cand); nofcand := 0 END;
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cand[nofcand] := p; INC(nofcand)
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END;
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@ -600,20 +594,18 @@ MODULE Heap;
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heapsize := 0;
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allocated := 0;
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lockdepth := 0;
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heapPosMin := MAX(S.ADDRESS);
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heapPosMax := 0;
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heapNegMin := 0;
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heapNegMax := MIN(S.ADDRESS);
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heapMin := -1; (* all bits set *)
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heapMax := 0;
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bigBlocks := 0;
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heap := NewChunk(heapSize0);
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S.PUT(heap + nextChnkOff, AddressZero);
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firstTry := TRUE;
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freeList[nofLists] := 1;
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freeList[nofLists] := 1; (* Sentinel, # 0 *)
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FileCount := 0;
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modules := NIL;
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bigBlocks := 0;
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fin := NIL;
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interrupted := FALSE;
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