DIRECTORY
Alloc: TYPE USING [Notifier],
BcdDefs: TYPE USING [Link, EPLimit, IRLinkLimit],
ComData: TYPE USING [idANY, importCtx, interface, linkCount, nBodies, nSigCodes, switches, textIndex],
CompilerUtil: TYPE USING [AppendBCDWord, AppendBCDWords],
Log: TYPE USING [Error, ErrorN, ErrorSei, WarningSei],
P4: TYPE USING [],
PrincOps:
TYPE
USING [
ControlLink, EPRange, globalbase, localbase, MaxFrameSize, MaxNGfi, Port, PsbIndex],
SourceMap: TYPE USING [Loc],
Symbols: TYPE USING [Base, BitAddress, BitCount, Type, UNSPEC, ISEIndex, CSEIndex, RecordSEIndex, CTXIndex, BTIndex, CBTIndex, nullName, ISENull, RecordSENull, CTXNull, BTNull, lL, RootBti, bodyType, ctxType, seType],
SymbolOps: TYPE USING [ArgCtx, ArgRecord, BitsForRange, Cardinality, DecodeBitAddr, DecodeCard, DecodeTreeIndex, DecodeType, EncodeBitAddr, EncodeCard, FirstCtxSe, LinkMode, MakeCtxSe, NextSe, PackedSize, TypeForm, UnderType, XferMode],
Target: TYPE MachineParms USING [PackedBitCount, bitsPerLongWord, bitsPerWord],
Tree: TYPE USING [Base, Index, Link, Scan, nullIndex, treeType],
TreeOps: TYPE USING [GetSe, ScanList, ToLoc];
Pass4L:
PROGRAM
IMPORTS CompilerUtil, Log, SymbolOps, TreeOps, dataPtr: ComData
EXPORTS P4 = {
OPEN SymbolOps, Symbols;
tb: Tree.Base; -- tree base (local copy)
seb: Symbols.Base; -- se table base (local copy)
ctxb: Symbols.Base; -- context table base (local copy)
bb: Symbols.Base; -- body table base (local copy)
LayoutNotify:
PUBLIC Alloc.Notifier = {
called by allocator whenever table area is repacked
tb ← base[Tree.treeType];
seb ← base[seType]; ctxb ← base[ctxType];
bb ← base[bodyType]};
wordLength: CARDINAL = Target.bitsPerWord;
longWordLength: CARDINAL = Target.bitsPerLongWord;
wordFill: CARDINAL = wordLength-1;
localOrigin: CARDINAL = PrincOps.localbase*wordLength;
localSlots: CARDINAL = 8;
globalOrigin: CARDINAL = PrincOps.globalbase*wordLength;
frameLimit: CARD = PrincOps.MaxFrameSize.LONG*wordLength;
entryLimit: CARDINAL = MIN[BcdDefs.EPLimit, PrincOps.MaxNGfi*PrincOps.EPRange];
BitsForType:
PUBLIC
PROC[type: Type]
RETURNS[nBits: BitCount] = {
assumes (an attempt at) prior processing by P4.DeclItem
sei: CSEIndex = UnderType[type];
WITH seb[sei]
SELECT
FROM
basic => nBits ← length;
enumerated => nBits ← BitsForRange[Cardinality[sei]-1];
ref => nBits ← wordLength;
transfer => nBits ← wordLength * (
SELECT mode
FROM
proc => PrincOps.ControlLink.SIZE,
port => PrincOps.Port.SIZE,
signal, error => PrincOps.ControlLink.SIZE,
process => PrincOps.PsbIndex.SIZE,
program => PrincOps.ControlLink.SIZE,
ENDCASE => ERROR);
arraydesc => nBits ← 2*wordLength;
relative => nBits ← BitsForType[offsetType];
zone => nBits ← (IF mds THEN 1 ELSE 2)*wordLength;
long =>
nBits ← ((BitsForType[rangeType] + wordFill + (longWordLength-wordLength))/wordLength)*wordLength;
real => nBits ← longWordLength;
ENDCASE => {
-- processing of se entry must be complete
IF ~mark4
THEN {
-- P4declitem has not been able to complete
Log.ErrorSei[typeLength,
IF seb[type].seTag = id THEN LOOPHOLE[type, ISEIndex] ELSE ISENull];
RETURN[0]};
WITH seb[sei]
SELECT
FROM
record => nBits ← length;
array => {
n: CARD = Cardinality[indexType];
b: BitCount ← BitsForType[componentType];
IF packed
AND (b#0
AND b<=Target.PackedBitCount.
LAST)
THEN {
-- b IN PackedBitCount
itemsPerWord: CARDINAL = wordLength/PackedSize[b];
nBits ←
IF n <= itemsPerWord
THEN n*PackedSize[b]
ELSE ((n+(itemsPerWord-1))/itemsPerWord)*wordLength}
ELSE {
b ← ((b + wordFill)/wordLength)*wordLength;
IF n > CARDINAL.LAST/b THEN Log.Error[arraySize];
nBits ← n*b}};
opaque => nBits ← length;
subrange => nBits ← IF empty THEN 0 ELSE BitsForRange[Cardinality[sei]-1];
ENDCASE => nBits ← 0};
RETURN};
FieldWordCount: TYPE = CARDINAL; -- [0..FieldBitCount.LAST/wordLength];
WordsForField:
PROC[sei: ISEIndex]
RETURNS[nW: FieldWordCount] = {
nBits: BitCount = BitsForType[seb[sei].idType] + wordFill;
IF nBits > BitCount.
LAST
THEN {
Log.ErrorSei[addressOverflow, sei]; nW ← FieldWordCount.LAST}
ELSE nW ← nBits/wordLength;
RETURN};
VarScan: TYPE = PROC[sei: ISEIndex, output: BOOL];
GenCtxVars:
PROC[ctx: CTXIndex, p: VarScan, output:
BOOL] = {
FOR sei: ISEIndex ← FirstCtxSe[ctx], NextSe[sei]
UNTIL sei = ISENull
DO
IF ~seb[sei].constant THEN p[sei, output] ENDLOOP};
GenBodyVars:
PROC[bti: CBTIndex, p: VarScan] = {
type: Type = bb[bti].ioType;
WITH se: seb[type]
SELECT
FROM
cons =>
WITH t: se
SELECT
FROM
transfer => {
GenCtxVars[ArgCtx[t.typeIn], p, FALSE];
GenCtxVars[ArgCtx[t.typeOut], p, TRUE]};
ENDCASE;
ENDCASE;
GenCtxVars[bb[bti].localCtx, p, FALSE]};
GenBodyProcs:
PROC[bti: BTIndex, proc:
PROC[CBTIndex]] = {
sonBti: BTIndex;
IF (sonBti ← bb[bti].firstSon) # BTNull
THEN
DO
WITH body: bb[sonBti]
SELECT
FROM
Callable => IF ~body.inline THEN proc[LOOPHOLE[sonBti]];
ENDCASE => NULL;
IF bb[sonBti].link.which = parent THEN EXIT;
sonBti ← bb[sonBti].link.index;
ENDLOOP};
GenImportedVars:
PROC[p: VarScan] = {
ctx: CTXIndex = dataPtr.importCtx;
FOR sei: ISEIndex ← FirstCtxSe[ctx], NextSe[sei]
UNTIL sei = ISENull
DO
IF ~seb[sei].constant THEN p[sei, FALSE]
ELSE {
type: CSEIndex = UnderType[seb[sei].idType];
WITH seb[type] SELECT FROM definition => GenCtxVars[defCtx, p, FALSE] ENDCASE};
ENDLOOP};
MarkArg: VarScan = {seb[sei].mark4 ← TRUE};
MarkArgs:
PROC[sei: Type] = {
type: CSEIndex = UnderType[sei];
rSei: RecordSEIndex;
WITH t: seb[type]
SELECT
FROM
transfer => {
IF (rSei ← ArgRecord[t.typeIn]) # RecordSENull
THEN {
GenCtxVars[seb[rSei].fieldCtx, MarkArg, FALSE];
seb[rSei].length ← LayoutArgs[rSei, 0, TRUE]*wordLength;
seb[rSei].mark4 ← TRUE};
IF (rSei ← ArgRecord[t.typeOut]) # RecordSENull
THEN {
GenCtxVars[seb[rSei].fieldCtx, MarkArg, TRUE];
seb[rSei].length ← LayoutArgs[rSei, 0, TRUE]*wordLength;
seb[rSei].mark4 ← TRUE};
t.mark4 ← TRUE};
ENDCASE};
EncodeBitAddress:
PROC[wd, bd:
CARDINAL]
RETURNS[Symbols.
UNSPEC] =
INLINE {
RETURN[EncodeBitAddr[[bd: wd*wordLength + bd]]]};
LayoutLocals:
PUBLIC
PROC[bti: CBTIndex]
RETURNS[length:
CARDINAL] = {
vProfile: Profile;
vI: CARDINAL;
CountVar: VarScan = {
IF seb[sei].hash # nullName OR seb[sei].extended OR ~output THEN vI ← vI + 1};
CountProc:
PROC[bti: CBTIndex] = {
IF bb[bti].info.mark = Internal THEN vI ← vI + 1};
InsertVar: VarScan = {
saveIndex: SourceMap.Loc = dataPtr.textIndex;
node: Tree.Index = DecodeTreeIndex[seb[sei].idValue];
nRefs: CARD = DecodeCard[seb[sei].idInfo];
IF node # Tree.nullIndex THEN dataPtr.textIndex ← TreeOps.ToLoc[tb[node].info];
IF seb[sei].hash # nullName
OR seb[sei].extended
OR ~output
THEN {
vProfile[vI] ← [link: [symbol[sei]], key: nRefs]; vI ← vI+1};
IF nRefs = 0
AND seb[sei].hash # nullName
AND ~output -- suppress message for return record
AND node # Tree.nullIndex THEN Log.WarningSei[unusedId, sei];
seb[sei].idInfo ← EncodeCard[WordsForField[sei]*wordLength];
seb[sei].idValue ← EncodeCard[0];
dataPtr.textIndex ← saveIndex};
InsertProc:
PROC[bti: CBTIndex] = {
IF bb[bti].info.mark = Internal
THEN {
vProfile[vI] ← VarInfo[
link: [body[bti]],
key: WITH bb[bti] SELECT FROM Inner=>frameOffset, ENDCASE=>0];
vI ← vI+1}};
bodyType: Type = bb[bti].ioType;
origin: CARDINAL ← IF bb[bti].level = lL THEN localOrigin ELSE localOrigin+wordLength;
IF ~seb[bodyType].mark4 THEN MarkArgs[bodyType];
vI ← 0; GenBodyVars[bti, CountVar]; GenBodyProcs[bti, CountProc];
vProfile ← AllocateProfile[vI];
vI ← 0; GenBodyVars[bti, InsertVar]; GenBodyProcs[bti, InsertProc];
SortProfile[vProfile];
origin ← AssignVars[vProfile, origin, localOrigin + localSlots*wordLength];
length ← AssignVars[vProfile, origin, frameLimit];
CheckFrameOverflow[vProfile]; vProfile ← NIL;
RETURN};
LayoutGlobals:
PUBLIC
PROC[bti: CBTIndex, stopping, fragments:
BOOL]
RETURNS[length: CARDINAL] = {
vProfile, pProfile, xProfile: Profile;
vI, pI, xI: CARDINAL;
CountVar: VarScan = {
ctx: CTXIndex = seb[sei].idCtx;
IF ctxb[ctx].ctxType = imported OR ctx = dataPtr.importCtx THEN xI ← xI + 1
ELSE
IF seb[sei].hash # nullName
OR seb[sei].extended
OR ~output
THEN {
IF seb[sei].public THEN pI ← pI + 1 ELSE vI ← vI + 1};
};
InsertVar: VarScan = {
ctx: CTXIndex = seb[sei].idCtx;
nRefs: CARD = DecodeCard[seb[sei].idInfo];
IF ctxb[ctx].ctxType = imported
OR ctx = dataPtr.importCtx
THEN {
xProfile[xI] ← [link: [symbol[sei]], key: nRefs];
xI ← xI+1;
IF nRefs = 0 AND ~seb[sei].public THEN Log.WarningSei[unusedId, sei];
seb[sei].idInfo ← EncodeCard[WordsForField[sei]*wordLength]}
ELSE {
saveIndex: SourceMap.Loc = dataPtr.textIndex;
node: Tree.Index = DecodeTreeIndex[seb[sei].idValue];
IF node # Tree.nullIndex THEN dataPtr.textIndex ← TreeOps.ToLoc[tb[node].info];
IF seb[sei].hash # nullName
OR seb[sei].extended
OR ~output
THEN {
IF seb[sei].public THEN {pProfile[pI] ← [link: [symbol[sei]], key: nRefs]; pI ← pI + 1}
ELSE {vProfile[vI] ← [link: [symbol[sei]], key: nRefs]; vI ← vI + 1}};
IF nRefs = 0
AND ~dataPtr.interface
AND ~seb[sei].public AND seb[sei].hash # nullName
AND node # Tree.nullIndex THEN Log.WarningSei[unusedId, sei];
seb[sei].idInfo ← EncodeCard[WordsForField[sei]*wordLength];
seb[sei].idValue ← EncodeCard[0];
dataPtr.textIndex ← saveIndex}};
origin: CARDINAL ← globalOrigin;
IF ~seb[bb[bti].ioType].mark4 THEN ERROR;
vI ← pI ← xI ← 0; GenBodyVars[bti, CountVar]; GenImportedVars[CountVar];
vProfile ← AllocateProfile[vI];
pProfile ← AllocateProfile[pI];
xProfile ← AllocateProfile[xI];
vI ← pI ← xI ← 0; GenBodyVars[bti, InsertVar]; GenImportedVars[InsertVar];
IF dataPtr.switches['s]
THEN {
SortProfile[vProfile]; SortProfile[pProfile]; SortProfile[xProfile]};
AssignImports[xProfile, 0, 256*PrincOps.ControlLink.SIZE*wordLength];
SELECT
TRUE
FROM
-- adjust for system uses of global 0
stopping => origin ← origin + wordLength;
fragments
OR pProfile.length # 0 =>
avoid overlay of global 0 (used for start traps).
note that fragment length >= 2*wordLength
origin ←
MAX[
AssignVars[vProfile, origin, globalOrigin+wordLength],
globalOrigin+wordLength];
ENDCASE;
IF pProfile.length # 0
THEN {
vProfile ← MergeProfiles[vProfile, pProfile]; pProfile ← NIL};
origin ← AssignVars[vProfile, origin, frameLimit];
length ← MAX[origin, globalOrigin+wordLength];
CheckFrameOverflow[vProfile]; vProfile ← NIL;
CheckFrameOverflow[xProfile]; xProfile ← NIL;
RETURN};
CheckBlock: PUBLIC PROC[bti: BTIndex] = {
CheckVar: VarScan = {
saveIndex: SourceMap.Loc = dataPtr.textIndex;
node: Tree.Index = DecodeTreeIndex[seb[sei].idValue];
IF node # Tree.nullIndex
THEN {
dataPtr.textIndex ← TreeOps.ToLoc[tb[node].info];
IF DecodeCard[seb[sei].idInfo] = 0 THEN Log.WarningSei[unusedId, sei]};
dataPtr.textIndex ← saveIndex};
GenCtxVars[bb[bti].localCtx, CheckVar, FALSE]};
LayoutBlock:
PUBLIC
PROC[bti: BTIndex, origin:
CARDINAL]
RETURNS[length:
CARDINAL] = {
vProfile: Profile;
vI: CARDINAL;
CountVar: VarScan = {vI ← vI + 1};
CountProc:
PROC[bti: CBTIndex] = {
IF bb[bti].info.mark = Internal THEN vI ← vI + 1};
InsertVar: VarScan = {
vProfile[vI] ← [link: [symbol[sei]], key: DecodeCard[seb[sei].idInfo]]; vI ← vI+1;
seb[sei].idInfo ← EncodeCard[WordsForField[sei]*wordLength];
seb[sei].idValue ← EncodeCard[0]};
InsertProc:
PROC[bti: CBTIndex] = {
IF bb[bti].info.mark = Internal
THEN {
vProfile[vI] ← VarInfo[
link: [body[bti]],
key: WITH bb[bti] SELECT FROM Inner=>frameOffset, ENDCASE=>0];
vI ← vI+1}};
vI ← 0; GenCtxVars[bb[bti].localCtx, CountVar, FALSE]; GenBodyProcs[bti, CountProc];
vProfile ← AllocateProfile[vI];
vI ← 0; GenCtxVars[bb[bti].localCtx, InsertVar, FALSE]; GenBodyProcs[bti, InsertProc];
SortProfile[vProfile];
length ← AssignVars[vProfile, origin, frameLimit];
CheckFrameOverflow[vProfile]; vProfile ← NIL;
RETURN};
LayoutInterface:
PUBLIC
PROC[bti: CBTIndex]
RETURNS[nEntries:
CARDINAL] = {
epN: CARDINAL ← 0;
FOR sei: ISEIndex ← FirstCtxSe[bb[bti].localCtx], NextSe[sei]
UNTIL sei = ISENull
DO
SELECT LinkMode[sei]
FROM
val, ref => {
seb[sei].linkSpace ← TRUE; seb[sei].idValue ← EncodeCard[epN]; epN ← epN + 1};
type => {seb[sei].idValue ← EncodeCard[epN]; epN ← epN + 1};
ENDCASE;
ENDLOOP;
IF (nEntries𡤎pN) > BcdDefs.IRLinkLimit
THEN
Log.ErrorN[interfaceEntries, nEntries-BcdDefs.IRLinkLimit];
RETURN};
CheckFrameOverflow:
PROC[profile: Profile] = {
FOR i:
INTEGER
IN [0 .. profile.length)
DO
WITH profile[i].link
SELECT
FROM
symbol => Log.ErrorSei[addressOverflow, index];
body => Log.ErrorSei[addressOverflow, bb[index].id];
ENDCASE;
ENDLOOP};
Align:
PROC[offset:
CARDINAL, item: VarLink]
RETURNS[
CARDINAL] = {
RETURN[
WITH item
SELECT
FROM
body => (offset+wordLength)/(4*wordLength)*(4*wordLength) + (2*wordLength),
symbol =>
SELECT XferMode[seb[index].idType]
FROM
port => (offset+wordLength)/(4*wordLength)*(4*wordLength) + (2*wordLength),
ENDCASE => offset,
ENDCASE => offset]};
BitWidth:
PROC[item: VarLink]
RETURNS[
CARDINAL] = {
RETURN[
WITH item
SELECT
FROM
symbol => DecodeCard[seb[index].idInfo],
body => PrincOps.ControlLink.SIZE*wordLength.LONG,
ENDCASE => (0).LONG]
AssignBase:
PROC[item: VarLink, base:
CARDINAL] = {
WITH item
SELECT
FROM
symbol => {
sei: ISEIndex = index;
seb[sei].idValue ← EncodeBitAddress[wd:base/wordLength, bd:0];
seb[sei].mark4 ← TRUE};
body => {
bti: CBTIndex = index;
WITH bb[bti]
SELECT
FROM
Inner => frameOffset ← base/wordLength;
ENDCASE => ERROR};
ENDCASE
AssignVars:
PROC[profile: Profile, origin, limit:
CARD]
RETURNS[
CARDINAL] = {
start, base, length, remainder, delta: CARDINAL;
i, j, next: INTEGER;
t: VarLink;
found, skips: BOOL;
next ← 0; start ← origin;
remainder ← IF origin < limit THEN limit - origin ELSE 0;
WHILE next < profile.length
DO
i ← next; found ← skips ← FALSE;
WHILE ~found
AND i < profile.length
DO
IF (t ← profile[i].link) # [empty[]]
THEN {
base ← Align[start, t]; length ← BitWidth[t];
delta ← base - start;
IF length + delta <= remainder
THEN {
limit: CARDINAL = base + length;
subBase: CARDINAL ← start;
nRefs: CARDINAL ← 0;
FOR j ← i+1, j+1
WHILE j < profile.length
AND subBase < limit
DO
IF profile[j].link # [empty[]]
THEN {
subLength: CARDINAL = BitWidth[profile[j].link];
subDelta: CARDINAL = Align[subBase, profile[j].link] - subBase;
IF (subDelta + subLength) > (limit - subBase) THEN EXIT;
subBase ← subBase + (subDelta + subLength);
nRefs ← nRefs + profile[j].key};
ENDLOOP;
IF nRefs <= profile[i].key
OR ~dataPtr.switches['s]
THEN {
found ← TRUE;
AssignBase[t, base]; profile[i].link ← [empty[]];
IF base # start
AND dataPtr.switches['s]
THEN
[] ← AssignVars[profile, start, base];
start ← limit;
remainder ← remainder - (length+delta)}
ELSE IF ~skips THEN {skips ← TRUE; next ← i}}};
i ← i+1;
IF ~skips THEN next ← i;
ENDLOOP;
ENDLOOP;
RETURN[start]};
AssignImports:
PROC[profile: Profile, origin, limit:
CARDINAL] = {
i, nProcs: CARDINAL ← profile.length;
next: CARDINAL;
t: VarLink;
v: VarInfo;
UNTIL i = 0
DO
i ← i-1; t ← profile[i].link;
WITH t
SELECT
FROM
symbol =>
IF XferMode[seb[index].idType] # proc
THEN {
nProcs ← nProcs-1; v ← profile[i];
FOR j: CARDINAL IN [i..nProcs) DO profile[j] ← profile[j+1] ENDLOOP;
profile[nProcs] ← v};
ENDCASE;
ENDLOOP;
the frame link fragment begins at origin
dataPtr.linkCount ← profile.length;
IF ~dataPtr.interface THEN CompilerUtil.AppendBCDWord[profile.length];
i ← profile.length;
next ← MIN[origin + profile.length*BcdDefs.Link.SIZE*wordLength, limit];
UNTIL i = 0
OR next = origin
DO
i ← i-1; t ← profile[i].link; profile[i].link ← [empty[]];
IF ~dataPtr.interface
THEN
WITH t
SELECT
FROM
symbol => {
sei: ISEIndex = index;
next ← next - DecodeCard[seb[sei].idInfo];
CompilerUtil.AppendBCDWords[@seb[sei].idValue, BcdDefs.Link.SIZE];
seb[sei].idValue ← EncodeBitAddress[wd: next/wordLength, bd: 0];
seb[sei].linkSpace ← TRUE};
ENDCASE;
ENDLOOP};
BitOffset:
PROC[sei: ISEIndex]
RETURNS[
CARDINAL] = {
t: BitAddress = DecodeBitAddr[seb[sei].idValue];
RETURN[t.bd]};
BitsForField:
PROC[sei: ISEIndex]
RETURNS[nB: BitCount] = {
nBits: BitCount = BitsForType[seb[sei].idType];
IF nBits > BitCount.
LAST
THEN {
Log.ErrorSei[addressOverflow, sei]; nB ← 0}
ELSE nB ← nBits;
RETURN};
ScanVariants:
PROC[caseCtx: CTXIndex, proc:
PROC[RecordSEIndex]
RETURNS[
BOOL]]
RETURNS[BOOL] = {
FOR sei: ISEIndex ← FirstCtxSe[caseCtx], NextSe[sei]
UNTIL sei = ISENull
DO
rSei: Type = DecodeType[seb[sei].idInfo];
WITH variant: seb[rSei]
SELECT
FROM
cons =>
WITH variant
SELECT
FROM
record => IF proc[LOOPHOLE[rSei]] THEN RETURN[TRUE];
ENDCASE => ERROR;
ENDCASE => NULL; -- skip multiple identifiers
ENDLOOP;
RETURN[FALSE]};
LayoutFields:
PUBLIC
PROC[rSei: RecordSEIndex, offset:
CARDINAL] = {
maxRecordSize: CARDINAL = CARDINAL.LAST/wordLength + 1;
w: CARD;
b: CARDINAL;
lastFillable: BOOL;
lastSei: ISEIndex;
AssignField:
PROC[sei: ISEIndex] = {
OPEN id: seb[sei];
n: BitCount;
nW, nB: CARDINAL;
saveIndex: SourceMap.Loc = dataPtr.textIndex;
dataPtr.textIndex ← TreeOps.ToLoc[tb[DecodeTreeIndex[id.idValue]].info];
n ← BitsForField[sei];
nW ← n/wordLength; nB ← n MOD wordLength;
IF nW > 0 AND nB # 0 THEN {nW ← nW+1; nB ← 0};
IF (nW > 0 OR b+nB > wordLength OR n = 0) AND b # 0 THEN {w ← w+1; b ← 0};
dataPtr.textIndex ← saveIndex;
IF b = 0 AND lastFillable THEN FillWord[lastSei];
IF w >= maxRecordSize THEN Log.ErrorSei[addressOverflow, sei];
id.idInfo ← EncodeCard[nW*wordLength + nB];
id.idValue ← EncodeBitAddress[wd:w, bd:b];
lastSei ← sei; lastFillable ← (nW = 0 AND n # 0);
w ← w + nW; b ← b + nB;
IF b >= wordLength THEN {w ← w+1; b ← b - wordLength};
IF (
IF b=0
THEN w
ELSE w+1) >= maxRecordSize
THEN
Log.ErrorSei[addressOverflow, sei]};
FillWord:
PROC[sei: ISEIndex] = {
t: BitAddress = DecodeBitAddr[seb[sei].idValue];
width: CARDINAL = wordLength - t.bd;
IF seb[rSei].machineDep
AND width # DecodeCard[seb[sei].idInfo]
THEN
Log.WarningSei[paddedField, sei];
seb[sei].idInfo ← EncodeCard[width]};
FindFit:
PROC[vSei: RecordSEIndex]
RETURNS[
BOOL] = {
sei: ISEIndex ← FirstCtxSe[seb[vSei].fieldCtx];
type: CSEIndex;
IF sei = ISENull THEN RETURN[FALSE];
type ← UnderType[seb[sei].idType];
WITH seb[type]
SELECT
FROM
union =>
IF controlled THEN sei ← tagSei
ELSE RETURN[ScanVariants[caseCtx, FindFit]];
sequence => IF controlled THEN sei ← tagSei ELSE RETURN[FALSE];
ENDCASE => NULL;
RETURN[BitsForType[seb[sei].idType] + b <= wordLength]};
vOrigin: CARDINAL;
maxLength: CARDINAL;
AssignVariant:
PROC[vSei: RecordSEIndex]
RETURNS[
BOOL] = {
LayoutFields[vSei, vOrigin];
maxLength ← MAX[seb[vSei].length, maxLength];
RETURN[FALSE]};
eqLengths: BOOL;
padEnd: CARDINAL;
PadVariant:
PROC[vSei: RecordSEIndex]
RETURNS[
BOOL] = {
fillSei: ISEIndex ← ISENull;
type: CSEIndex;
fillOrigin, currentEnd: CARDINAL;
ctx: CTXIndex = seb[vSei].fieldCtx;
FOR sei: ISEIndex ← FirstCtxSe[ctx], NextSe[sei]
UNTIL sei = ISENull
DO
IF DecodeBitAddr[seb[sei].idValue].bd/wordLength # w THEN EXIT;
fillSei ← sei;
ENDLOOP;
IF fillSei # ISENull
THEN {
fillOrigin ← BitOffset[fillSei];
currentEnd ← fillOrigin + DecodeCard[seb[fillSei].idInfo];
IF currentEnd < padEnd
AND (currentEnd # 0
OR padEnd < wordLength)
THEN {
type ← UnderType[seb[fillSei].idType];
WITH seb[type]
SELECT
FROM
union => {
saveLastSei: ISEIndex = lastSei;
IF controlled THEN lastSei ← tagSei; -- for messages only
[] ← ScanVariants[caseCtx, PadVariant];
lastSei ← saveLastSei};
ENDCASE => IF seb[rSei].machineDep THEN Log.WarningSei[paddedField, fillSei];
seb[fillSei].idInfo ← EncodeCard[padEnd - fillOrigin]}}
ELSE
IF vOrigin < padEnd
AND (vOrigin # 0
OR padEnd < wordLength)
THEN {
IF seb[rSei].machineDep THEN Log.WarningSei[paddedField, lastSei];
fillSei ← MakeCtxSe[nullName, CTXNull];
seb[fillSei].public ← TRUE; seb[fillSei].extended ← FALSE;
seb[fillSei].constant ← seb[fillSei].immutable ← FALSE;
seb[fillSei].linkSpace ← FALSE;
seb[fillSei].idType ← dataPtr.idANY;
seb[fillSei].idValue ← EncodeBitAddress[wd:w, bd:b];
seb[fillSei].idInfo ← EncodeCard[padEnd - vOrigin];
seb[fillSei].mark3 ← seb[fillSei].mark4 ← TRUE;
WITH seb[fillSei] SELECT FROM linked => link ← ctxb[ctx].seList ENDCASE => ERROR;
ctxb[ctx].seList ← fillSei};
seb[vSei].length ←
MIN[
maxLength,
(seb[vSei].length + wordFill)/wordLength * wordLength];
IF seb[vSei].length # maxLength THEN eqLengths ← FALSE;
RETURN[FALSE]};
type: CSEIndex;
ctx: CTXIndex = seb[rSei].fieldCtx;
w ← offset/wordLength; b ← offset MOD wordLength;
lastFillable ← FALSE; lastSei ← ISENull;
FOR sei: ISEIndex ← FirstCtxSe[ctx], NextSe[sei]
UNTIL sei = ISENull
DO
IF ~seb[sei].constant
THEN {
type ← UnderType[seb[sei].idType];
WITH seb[type]
SELECT
FROM
union => {
IF ~controlled THEN seb[sei].idValue ← EncodeBitAddress[wd:w, bd:b]
ELSE {AssignField[tagSei]; seb[sei].idValue ← seb[tagSei].idValue};
IF lastFillable
AND b # 0
AND ~ScanVariants[caseCtx, FindFit]
THEN {
FillWord[lastSei]; w ← w+1; b ← 0};
maxLength ← vOrigin ← w*wordLength + b;
[] ← ScanVariants[caseCtx, AssignVariant];
padEnd ←
IF maxLength < wordLength
THEN maxLength
ELSE MAX[(vOrigin + wordFill)/wordLength, 1]*wordLength;
eqLengths ← TRUE;
[] ← ScanVariants[caseCtx, PadVariant];
hints.equalLengths ← eqLengths;
seb[sei].idInfo ← EncodeCard[
(IF controlled THEN DecodeCard[seb[tagSei].idInfo] ELSE (0).LONG)];
w ← maxLength/wordLength; b ← maxLength MOD wordLength;
lastFillable ← FALSE};
sequence => {
IF ~controlled THEN seb[sei].idValue ← EncodeBitAddress[wd:w, bd:b]
ELSE {AssignField[tagSei]; seb[sei].idValue ← seb[tagSei].idValue};
IF lastFillable AND b # 0 THEN {FillWord[lastSei]; w ← w+1; b ← 0};
seb[sei].idInfo ← EncodeCard[(CARDINAL[w]*wordLength+b) - BitOffset[sei]];
lastFillable ← FALSE};
ENDCASE => AssignField[sei]};
ENDLOOP;
IF lastFillable AND b # 0 AND w > 0 THEN {FillWord[lastSei]; b ← 0; w ← w+1};
seb[rSei].length ← w*wordLength + b};
CheckFields:
PUBLIC
PROC[rSei: RecordSEIndex, origin:
CARDINAL] = {
vProfile: Profile;
vI: CARDINAL;
CountVar: VarScan = {vI ← vI + 1};
InsertVar: VarScan = {
vProfile[vI] ← [link:[symbol[sei]], key:BitOffset[sei]]; vI ← vI+1};
b, newB: CARDINAL;
sei, lastSei: ISEIndex;
vI ← 0; GenCtxVars[seb[rSei].fieldCtx, CountVar, FALSE];
vProfile ← AllocateProfile[vI];
vI ← 0; GenCtxVars[seb[rSei].fieldCtx, InsertVar, FALSE];
SortProfile[vProfile];
b ← origin; lastSei ← ISENull;
FOR vI
DECREASING
IN [0 .. vProfile.length)
DO
sei ← NARROW[vProfile[vI].link, VarLink.symbol].index;
SELECT TypeForm[seb[sei].idType]
FROM
union => CheckVariants[sei];
sequence => {
IF vI # 0 THEN Log.ErrorSei[recordOverlap, sei];
CheckSequence[sei]};
ENDCASE;
SELECT (newB ← vProfile[vI].key)
FROM
> b => Log.ErrorSei[recordGap, lastSei];
< b => Log.ErrorSei[recordOverlap, sei];
ENDCASE;
b ← newB + DecodeCard[seb[sei].idInfo]; lastSei ← sei;
ENDLOOP;
vProfile ← NIL;
IF b > wordLength
AND b
MOD wordLength # 0
THEN {
Log.ErrorSei[recordGap, lastSei];
b ← ((b+wordFill)/wordLength) * wordLength};
seb[rSei].length ← b};
CheckVariants:
PROC[sei: ISEIndex] = {
type: CSEIndex = UnderType[seb[sei].idType];
started: BOOL ← FALSE;
eqLengths: BOOL ← TRUE;
gaps: BOOL ← FALSE;
origin, maxLength, size: CARDINAL;
CheckVariant:
PROC[rSei: RecordSEIndex]
RETURNS[
BOOL] = {
length: CARDINAL;
CheckFields[rSei, origin]; length ← seb[rSei].length;
IF ~started THEN {maxLength ← length; started ← TRUE}
ELSE {
IF length MOD wordLength # 0 OR maxLength MOD wordLength # 0 THEN gaps ← TRUE;
IF length # maxLength THEN {maxLength ← MAX[length, maxLength]; eqLengths ← FALSE}};
RETURN[FALSE]};
origin ← BitOffset[sei];
WITH union: seb[type]
SELECT
FROM
union => {
IF union.controlled
THEN {
newOrigin: CARDINAL = BitOffset[union.tagSei];
IF origin # newOrigin THEN Log.ErrorSei[fieldPosition, union.tagSei];
origin ← newOrigin + DecodeCard[seb[union.tagSei].idInfo]};
[] ← ScanVariants[union.caseCtx, CheckVariant];
size ← maxLength - BitOffset[sei]; union.hints.equalLengths ← eqLengths;
IF gaps THEN Log.ErrorSei[recordGap, sei];
SELECT DecodeCard[seb[sei].idInfo]
FROM
0 => seb[sei].idInfo ← EncodeCard[size];
size => NULL;
ENDCASE => Log.ErrorSei[fieldPosition, sei]};
ENDCASE => ERROR};
CheckSequence:
PROC[sei: ISEIndex] = {
type: CSEIndex = UnderType[seb[sei].idType];
origin, length: CARDINAL;
origin ← BitOffset[sei];
WITH seq: seb[type]
SELECT
FROM
sequence => {
IF seq.controlled
THEN {
newOrigin: CARDINAL = BitOffset[seq.tagSei];
IF origin # newOrigin THEN Log.ErrorSei[fieldPosition, seq.tagSei];
origin ← newOrigin + DecodeCard[seb[seq.tagSei].idInfo]};
IF origin MOD wordLength # 0 THEN Log.ErrorSei[fieldPosition, sei];
length ← origin - BitOffset[sei];
SELECT DecodeCard[seb[sei].idInfo]
FROM
0 => seb[sei].idInfo ← EncodeCard[length];
length => NULL;
ENDCASE => Log.ErrorSei[fieldPosition, sei]};
ENDCASE => ERROR};
}.