DIRECTORY
AMBridge,
AMBridgeExtras USING[],  -- EXPORTS only, to be merged with next release of AMBridge
AMTypes,
AtomsPrivate USING[GetAtom],
Environment USING[bitsPerWord],
Inline USING[BITSHIFT, LongCOPY, LongNumber, LowHalf, HighHalf],
RCMap USING[nullIndex],
Rope USING[ROPE],
RTCommon USING
[FetchField, FetchFieldLong, StoreFieldLong, ShortenLongCardinal, ShortenLongInteger, Field],
RTStorageOps USING[ValidateRef],
RTTypesBasic USING[GetReferentType, Type, nullType, anyType],
RTTypesBasicPrivate USING[MapTiRcmx],
RTTypesPrivate,
RTTypesRemotePrivate USING
[GetRemoteGFHeader, GetRemoteWords, RemoteStoreWord, RemoteStoreDoubleWord, RemoteStoreFieldLong, GetRemoteWord, GetRemoteLC],
WorldVM USING[CurrentIncarnation, Long, LocalWorld, World, Write, CopyWrite];

RTTypesBridgeImpl: PROGRAM
IMPORTS
AMBridge, AtomsPrivate, RTCommon, RTStorageOps, RTTypesBasic, AMTypes, RTTypesPrivate, RTTypesBasicPrivate, RTTypesRemotePrivate, WorldVM
EXPORTS
AMTypes, AMBridge, AMBridgeExtras, RTTypesPrivate
= BEGIN OPEN
AMBridge, AMTypes, Environment, Rope, tp: RTTypesPrivate, RTCommon, RTTypesBasic, RTStorageOps, RTTypesRemotePrivate, WorldVM;

TypedVariableRec: TYPE = tp.TypedVariableRec;
Pointer: TYPE = LONG POINTER --TO UNSPECIFIED--; 

tvZone: ZONE;
tvPrefixedZone: ZONE;


IsAtom: PUBLIC SAFE PROC
[tv: TypedVariable--ref any--] RETURNS[ans: BOOL _ TRUE] = TRUSTED {
[] _ Coerce[tv, CODE[ATOM] ! Error => {ans _ FALSE; CONTINUE}]};

IsRope: PUBLIC SAFE PROC
[tv: TypedVariable--ref any--] RETURNS[ans: BOOL _ TRUE] = TRUSTED {
[] _ Coerce[tv, CODE[ROPE] ! Error => {ans _ FALSE; CONTINUE}];
};

IsRefAny: PUBLIC SAFE PROC[type: Type--ref--] RETURNS[ans: BOOL _ TRUE] = TRUSTED {
type _ UnderType[type];
RETURN[TypeClass[type] = ref AND Range[type] = anyType];
};

TVHead: PUBLIC PROC[tv: TypedVariable] RETURNS[AMBridge.TVHeadType] = {
IF tv = NIL THEN RETURN[notTVRecord];
WITH tv SELECT FROM
tvr: REF TypedVariableRec => RETURN[tvr.head.tag];
ENDCASE => RETURN[notTVRecord];
};

TVType: PUBLIC SAFE PROC[tv: TypedVariable] RETURNS[type: Type] = TRUSTED {
IF tv = NIL THEN RETURN[nullType];
WITH tv SELECT FROM
tr: REF TypedVariableRec => RETURN[tr.referentType.type];
ENDCASE => ERROR;
};

TVStatus: PUBLIC SAFE PROC[tv: TypedVariable] RETURNS[Status] = TRUSTED {
IF tv = NIL THEN RETURN[readOnly];
WITH tv SELECT FROM
tr: REF TypedVariableRec => RETURN[tr.status];
ENDCASE => ERROR
};


TVForReferent: PUBLIC PROC
[ref: REF, status: Status _ mutable] RETURNS[tv: TypedVariable] = {
type: Type;
bitsForType: LONG CARDINAL;     
ValidateRef[ref];
WITH ref SELECT FROM
a: ATOM => ERROR Error[reason: typeFault, type: CODE[ATOM]];
r: ROPE => ERROR Error[reason: typeFault, type: CODE[ROPE]];
ENDCASE;
type _ GetReferentType[ref];
IF type = nullType THEN RETURN[NIL];
bitsForType _ tp.BitsForType[type].bft;
IF bitsForType IN [1..bitsPerWord)
THEN
tv _ tvZone.NEW[TypedVariableRec _ [
referentType: [type],
head: [reference[ref: ref]],
status: status,
field: embedded
[fd: [
wordOffset: 0,
extent: small[
field: [bitFirst: bitsPerWord-bitsForType, bitCount: bitsForType]]]]]]
ELSE
tv _ tvZone.NEW[TypedVariableRec _ [
referentType: [type],
head: [reference[ref: ref]],
status: status,
field: entire[]]]};

TVForReadOnlyReferent:  PUBLIC PROC
[ref: REF READONLY ANY] RETURNS[TypedVariable] = {
ValidateRef[LOOPHOLE[ref]];
RETURN[TVForReferent[ref: LOOPHOLE[ref], status: readOnly]]};

RefFromTV: PUBLIC PROC[tv: TypedVariable] RETURNS[REF ANY] = {
WITH tv SELECT FROM
tr: REF TypedVariableRec =>
SELECT TRUE FROM
tr.tag # entire => ERROR Error[reason: internalTV];
tr.status # mutable => ERROR Error[reason: notMutable];
ENDCASE =>
WITH head: tr.head SELECT FROM
reference => RETURN[head.ref];
ENDCASE => ERROR Error[reason: internalTV];
ENDCASE => ERROR;
};

ReadOnlyRefFromTV: PUBLIC PROC[tv: TypedVariable --, status: readOnly--]
RETURNS[REF READONLY ANY] = {
WITH tv SELECT FROM
tr: REF TypedVariableRec => {
IF tr.tag # entire
THEN ERROR Error[reason: internalTV]
ELSE WITH head: tr.head SELECT FROM
reference => RETURN[LOOPHOLE[head.ref]];
ENDCASE => ERROR Error[reason: internalTV]};
ENDCASE => ERROR};

SomeRefFromTV: PUBLIC PROC[tv: TypedVariable] RETURNS[REF ANY] = {
WITH tv SELECT FROM
tr: REF TypedVariableRec =>
IF tr.tag # entire OR tr.status # mutable OR tr.head.tag # reference
THEN WITH Copy[tv] SELECT FROM
tr: REF TypedVariableRec =>
WITH head: tr.head SELECT FROM
reference => RETURN[head.ref];
ENDCASE => ERROR Error[reason: internalTV, msg: "not a REF head"];
ENDCASE => ERROR
ELSE RETURN[RefFromTV[tv]];
ENDCASE => ERROR};

TVForATOM: PUBLIC PROC[atom: ATOM] RETURNS[TypedVariable--atom--] = {
RETURN[TVForReadOnlyReferent[NEW[ATOM _ atom]]]};

TVToATOM: PUBLIC PROC[tv: TypedVariable--atom--] RETURNS[ATOM] = {
type: Type = UnderType[TVType[tv]];
SELECT TypeClass[type] FROM
ref =>
IF Range[type] = anyType THEN RETURN [TVToATOM[Coerce[tv, CODE[ATOM]]]];
atom => RETURN [AtomsPrivate.GetAtom[TVToName[tv]]];
ENDCASE; 
ERROR Error[reason: typeFault, type: type];
};

TVForROPE: PUBLIC PROC[rope: ROPE] RETURNS[TypedVariable--rope--] = {
RETURN[TVForReadOnlyReferent[NEW[ROPE _ rope]]]};

TVForPointerReferent: PUBLIC PROC[ptr: Pointer, type: Type, status: Status _ mutable]
RETURNS[tv: TypedVariable] = {
bitsForType: LONG CARDINAL _ bitsPerWord--not smaller than a word--;
IF ptr = NIL THEN RETURN[NIL];
bitsForType _ tp.BitsForType[
type
! Error => IF reason = typeFault THEN CONTINUE;  -- not smaller than a word
].bft;
IF bitsForType IN [1..bitsPerWord)
THEN
tv _ tvZone.NEW[TypedVariableRec _ [
referentType: [type],
head: [pointer[ptr: ptr]],
status: status,
field: embedded[fd: [
wordOffset: 0,
extent: small[field: [bitFirst: bitsPerWord-bitsForType,
bitCount: ShortenLongCardinal[bitsForType]]]]]]]
ELSE
tv _ tvZone.NEW[TypedVariableRec _ [
referentType: [type],
head: [pointer[ptr: ptr]],
status: status,
field: entire[]]]};

PointerFromTV: PUBLIC PROC[tv: TypedVariable] RETURNS[Pointer] = {
GetHeadPointer: PROC[tr: REF TypedVariableRec] RETURNS[p: Pointer] = INLINE {
WITH head: tr.head SELECT FROM
pointer => p _ head.ptr;
reference => ERROR Error[reason: typeFault, type: nullType];
gfh => p _ LOOPHOLE[LONG[head.gfh]];
fh => p _ LOOPHOLE[LONG[head.fh]];
ENDCASE => ERROR Error[reason: typeFault, type: nullType];
};
IF tv = NIL THEN RETURN[NIL];
WITH tv SELECT FROM
tr: REF TypedVariableRec => {
IF tr.status # mutable THEN ERROR Error[reason: notMutable];
WITH etr: tr SELECT FROM
embedded =>
WITH fd: etr.fd SELECT FROM
large => RETURN[GetHeadPointer[tr] + fd.wordOffset];
small => IF fd.field.bitFirst = 0
THEN RETURN[GetHeadPointer[tr] + fd.wordOffset]
ELSE ERROR Error[reason: internalTV];
ENDCASE => ERROR;
entire =>  RETURN[GetHeadPointer[tr]];   --may have been narrowed--
ENDCASE => ERROR}
ENDCASE => ERROR Error[reason: typeFault, type: nullType]};

GetValueAddress: PUBLIC PROC
[tv: TypedVariable, mutableOnly: BOOLEAN _ FALSE] RETURNS[tp.ValueAddress] = {
IF tv = NIL
THEN IF mutableOnly
THEN ERROR Error[reason: notMutable]
ELSE {
ws: WordSequence = NEW[WordSequenceRecord[2]];
LOOPHOLE[@ws[0], LONG POINTER TO LONG CARDINAL] ^ _ 0;
RETURN[[constant[value: ws]]]};
IF mutableOnly
THEN WITH tv SELECT FROM
tr: REF TypedVariableRec =>
WITH h: tr.head SELECT FROM
gfh => IF NOT h.gfh.started THEN ERROR Error[reason: notMutable];
remoteGFH
=> IF NOT GetRemoteGFHeader[h.remoteGlobalFrameHandle].started
THEN ERROR Error[reason: notMutable];
ENDCASE;
ENDCASE => ERROR;

WITH tv SELECT FROM
tr: REF TypedVariableRec => {
IF mutableOnly AND tr.status # mutable THEN ERROR Error[reason: notMutable];
WITH head: tr.head SELECT FROM
pointer => {
ptr: Pointer _ head.ptr;
WITH etr: tr SELECT FROM
embedded => RETURN[[pointer[ptr: ptr + etr.fd.wordOffset, fd: etr.fd]]];
entire => RETURN[[pointer[ptr: ptr,
fd: [wordOffset: 0, extent: large[size: TVSize[tv]]]]]];
ENDCASE => ERROR Error[reason: notMutable]};
reference => {
ptr: Pointer _ LOOPHOLE[head.ref];
WITH etr: tr SELECT FROM
embedded => RETURN[[pointer[ptr: ptr + etr.fd.wordOffset, fd: etr.fd]]];
entire => RETURN[[pointer[ptr: ptr,
fd: [wordOffset: 0, extent: large[size: TVSize[tv]]]]]];
ENDCASE => ERROR Error[reason: notMutable]};
gfh => {
ptr: Pointer _ LOOPHOLE[LONG[head.gfh]];
WITH etr: tr SELECT FROM
embedded => RETURN[[pointer[ptr: ptr + etr.fd.wordOffset, fd: etr.fd]]];
entire => RETURN[[pointer[ptr: ptr,
fd: [wordOffset: 0, extent: large[size: TVSize[tv]]]]]];
ENDCASE => ERROR Error[reason: notMutable]};
fh => {
ptr: Pointer _ LOOPHOLE[LONG[head.fh]];
WITH etr: tr SELECT FROM
embedded => RETURN[[pointer[ptr: ptr + etr.fd.wordOffset, fd: etr.fd]]];
entire => RETURN[[pointer[ptr: ptr,
fd: [wordOffset: 0, extent: large[size: TVSize[tv]]]]]];
ENDCASE => ERROR Error[reason: notMutable]};
constant => WITH etr: tr SELECT FROM
constant => RETURN[[constant[value: etr.value]]];
ENDCASE => ERROR;
remotePointer => {
ptr: RemotePointer _ head.remotePointer;
WITH etr: tr SELECT FROM
embedded => {ptr.ptr _ LOOPHOLE[ptr.ptr, LONG CARDINAL] + etr.fd.wordOffset;
RETURN[[remotePointer[ptr: ptr, fd: etr.fd]]]};
entire => RETURN[[remotePointer[ptr: ptr,
fd: [wordOffset: 0,
extent: large[size: TVSize[tv]]]]]];
ENDCASE => ERROR Error[reason: notMutable]};
remoteReference => {
ptr: RemotePointer _ [world: head.remoteRef.world,
worldIncarnation: CurrentIncarnation[head.remoteRef.world],
ptr: head.remoteRef.ref];
WITH etr: tr SELECT FROM
embedded => {ptr.ptr _ LOOPHOLE[ptr.ptr, LONG CARDINAL] + etr.fd.wordOffset;
RETURN[[remotePointer[ptr: ptr, fd: etr.fd]]]};
entire => RETURN[[remotePointer[ptr: ptr,
fd: [wordOffset: 0,
extent: large[size: TVSize[tv]]]]]];
ENDCASE => ERROR Error[reason: notMutable]};
copiedRemoteObject => {
ptr: Pointer _ LOOPHOLE[@head.copy[0]];
WITH etr: tr SELECT FROM
embedded => RETURN[[copiedRemoteObject[ptr: ptr + etr.fd.wordOffset,
fd: etr.fd]]];
entire => RETURN[[copiedRemoteObject
[ptr: ptr,
fd: [wordOffset: 0,
extent: large[size: TVSize[tv]]]]]];
ENDCASE => ERROR Error[reason: notMutable]};
remoteGFH => {
ptr: RemotePointer _ [world: head.remoteGlobalFrameHandle.world,
worldIncarnation: CurrentIncarnation[head.remoteGlobalFrameHandle.world],
ptr: Long[world: head.remoteGlobalFrameHandle.world,
addr: head.remoteGlobalFrameHandle.gfh]];
WITH etr: tr SELECT FROM
embedded => {ptr.ptr _ LOOPHOLE[ptr.ptr, LONG CARDINAL] + etr.fd.wordOffset;
RETURN[[remotePointer[ptr: ptr, fd: etr.fd]]]};
entire => RETURN[[remotePointer[ptr: ptr,
fd: [wordOffset: 0,
extent: large[size: TVSize[tv]]]]]];
ENDCASE => ERROR Error[reason: notMutable]};
remoteFH => {
ptr: RemotePointer _ [world: head.remoteFrameHandle.world,
worldIncarnation: CurrentIncarnation[head.remoteFrameHandle.world],
ptr: Long[world: head.remoteFrameHandle.world, addr: head.remoteFrameHandle.fh]];
WITH etr: tr SELECT FROM
embedded => {ptr.ptr _ LOOPHOLE[ptr.ptr, LONG CARDINAL] + etr.fd.wordOffset;
RETURN[[remotePointer[ptr: ptr, fd: etr.fd]]]};
entire => RETURN[[remotePointer[
ptr: ptr,
fd: [wordOffset: 0, extent: large[size: TVSize[tv]]]]]];
ENDCASE => ERROR Error[reason: notMutable]};
remoteConstant => WITH etr: tr SELECT FROM
constant => RETURN[[constant[value: etr.value]]];
ENDCASE => ERROR;
ENDCASE => ERROR Error[reason: notMutable]};
ENDCASE => ERROR;
};  -- end GetValueAddress


TVEq: PUBLIC SAFE PROC[tv1, tv2: TypedVariable] RETURNS [BOOLEAN] = TRUSTED {
RETURN[EQValueAddress[GetValueAddress[tv1], GetValueAddress[tv2]]]};

EQValueAddress: PROC[a1, a2: tp.ValueAddress] RETURNS[BOOLEAN] = {
fd1, fd2: tp.FieldDescriptor;
WITH t: a1 SELECT FROM
constant => {
IF a2.tag # constant
OR t.value.size # NARROW[a2, constant tp.ValueAddress].value.size
THEN RETURN[FALSE];
FOR i: NAT IN [0..t.value.size)
DO IF t.value[i] # NARROW[a2, constant tp.ValueAddress].value[i]
THEN RETURN[FALSE];
ENDLOOP;
RETURN[TRUE]};
pointer => {
IF a2.tag # pointer THEN RETURN[FALSE];
IF t.ptr # NARROW[a2, pointer tp.ValueAddress].ptr
THEN RETURN[FALSE];
fd1 _ t.fd;
fd2 _ NARROW[a2, pointer tp.ValueAddress].fd;
};
remotePointer => {
IF a2.tag # remotePointer THEN RETURN[FALSE];
IF t.ptr # NARROW[a2, remotePointer tp.ValueAddress].ptr
THEN RETURN[FALSE];
fd1 _ t.fd;
fd2 _ NARROW[a2, remotePointer tp.ValueAddress].fd;
};
copiedRemoteObject =>  {
IF a2.tag # copiedRemoteObject THEN RETURN[FALSE];
IF t.ptr # NARROW[a2, copiedRemoteObject tp.ValueAddress].ptr
THEN RETURN[FALSE];
fd1 _ t.fd;
fd2 _ NARROW[a2, copiedRemoteObject tp.ValueAddress].fd;
};
ENDCASE;

WITH f1: fd1 SELECT FROM
small => WITH f2: fd2 SELECT FROM
small => IF f1.field # f2.field THEN RETURN[FALSE];
ENDCASE => RETURN[FALSE];
large => WITH f2: fd2 SELECT FROM
large => IF f1.size # f2.size THEN RETURN[FALSE];
ENDCASE => RETURN[FALSE];
ENDCASE;
RETURN[TRUE]};

TVEqual: PUBLIC SAFE PROC[tv1, tv2: TypedVariable] RETURNS [BOOLEAN] = TRUSTED {
world1: WorldVM.World _ AMBridge.GetWorld[tv1];
world2: WorldVM.World _ AMBridge.GetWorld[tv2];
class1: Class _ AMTypes.UnderClass[AMTypes.TVType[tv1]];
class2: Class _ AMTypes.UnderClass[AMTypes.TVType[tv2]];
size1,size2: INT;
IF world1 # world2 THEN RETURN [FALSE];
IF TVEq[tv1, tv2] THEN RETURN [TRUE];
SELECT class1 FROM
localFrame, globalFrame => RETURN [FALSE];
ENDCASE;
SELECT class2 FROM
localFrame, globalFrame => RETURN [FALSE];
ENDCASE;
size1 _ AMTypes.TVSize[tv1];
size2 _ AMTypes.TVSize[tv2];
IF size1 # size2 THEN RETURN [FALSE];
IF size1 <= 2 THEN RETURN[TVToLC[tv1] = TVToLC[tv2]];
FOR i: INT IN [0..size1) DO
IF AMBridge.OctalRead[tv1, i] # AMBridge.OctalRead[tv2, i]
THEN RETURN[FALSE];
ENDLOOP;
RETURN[TRUE];
};

TVToLC: PUBLIC PROC[tv: TypedVariable] RETURNS[lc: LONG CARDINAL] = {
a: tp.ValueAddress = GetValueAddress[tv];
ptr: Pointer;
fd: tp.FieldDescriptor;
WITH t: a SELECT FROM
constant => RETURN[IF t.value.size > 2
THEN ERROR Error[reason: typeFault, type: TVType[tv]]
ELSE LOOPHOLE[@t.value[0],
LONG POINTER TO LONG CARDINAL]^
+ tp.GetOrigin[TVType[tv]]];
pointer => {ptr _ t.ptr; fd _ t.fd};
remotePointer => {
WITH f: t.fd SELECT FROM
large => {
SELECT f.size FROM
1 => lc _ GetRemoteWord[remotePointer: t.ptr];
2 => lc _ GetRemoteLC[remotePointer: t.ptr];
ENDCASE => ERROR Error[reason: typeFault, type: TVType[tv]];
lc _ LOOPHOLE[LOOPHOLE[lc, LONG INTEGER] + tp.GetOrigin[TVType[tv]],
LONG CARDINAL];
RETURN};
small => {
word: WORD _ GetRemoteWord[remotePointer: t.ptr];
RETURN[FetchFieldLong[@word, f.field] + tp.GetOrigin[TVType[tv]]]};
ENDCASE => ERROR};
copiedRemoteObject => {ptr _ t.ptr; fd _ t.fd};
ENDCASE;

WITH f: fd SELECT FROM
large => {
SELECT f.size FROM
1 => lc _ LOOPHOLE[ptr, LONG POINTER TO CARDINAL]^;
2 => lc _ LOOPHOLE[ptr, LONG POINTER TO LONG CARDINAL]^;
ENDCASE => ERROR Error[reason: typeFault, type: TVType[tv]];
lc _ LOOPHOLE[
LOOPHOLE[lc, LONG INTEGER] + tp.GetOrigin[TVType[tv]],
LONG CARDINAL];
RETURN};
small => lc _ FetchFieldLong[ptr, f.field] + tp.GetOrigin[TVType[tv]];
ENDCASE => ERROR;
};

TVToInteger: PUBLIC PROC[tv: TypedVariable] RETURNS[INTEGER] = {
RETURN[ShortenLongInteger[TVToLI[tv]]]
};

TVToLI: PUBLIC PROC[tv: TypedVariable] RETURNS[LONG INTEGER] = {
lc: LONG CARDINAL _ TVToLC[tv];
IF TVSize[tv] = 1 AND TypeClass[GroundStar[TVType[tv]]] = integer
THEN RETURN[LONG[LOOPHOLE[LOOPHOLE[lc,Inline.LongNumber].lowbits, INTEGER]]]
ELSE RETURN[LOOPHOLE[lc, LONG INTEGER]]};

TVToRef: PUBLIC PROC[tv: TV] RETURNS[REF ANY] = {
IF GetWorld[tv] # LocalWorld[] THEN
ERROR Error[reason: typeFault, msg: "Can't get a local REF for a remote object"];
SELECT TypeClass[UnderType[TVType[tv]]] FROM
atom, rope, list, ref => RETURN[LOOPHOLE[TVToLC[tv], REF ANY]];
ENDCASE => ERROR Error[reason: typeFault, type: TVType[tv]];
};

TVToReal: PUBLIC PROC[tv: TypedVariable] RETURNS[REAL] = {
RETURN[LOOPHOLE[TVToLC[tv], REAL]]};

TVToCardinal: PUBLIC PROC[tv: TypedVariable] RETURNS[CARDINAL] = {
RETURN[ShortenLongCardinal[TVToLC[tv]]]};

TVToCharacter: PUBLIC PROC[tv: TypedVariable] RETURNS[CHARACTER] = {
ans: INTEGER = TVToInteger[tv];
IF ans IN [(FIRST[CHARACTER] - 0C)..(LAST[CHARACTER] - 0C)]
THEN RETURN[LOOPHOLE[ans, CHARACTER]]
ELSE ERROR Error[reason: rangeFault]};

TVToWordSequence: PUBLIC PROC[tv: TypedVariable] RETURNS [s: WordSequence] = {
ptr: Pointer;
words: CARDINAL = TVSize[tv];
SELECT words FROM
0 => s _ tvPrefixedZone.NEW[WordSequenceRecord[words]];
1 => {
s _ tvPrefixedZone.NEW[WordSequenceRecord[words]];
LOOPHOLE[@s[0], LONG POINTER TO CARDINAL]^ _ ShortenLongCardinal[TVToLC[tv]];
RETURN};
2 => {
s _ tvPrefixedZone.NEW[WordSequenceRecord[words]];
LOOPHOLE[@s[0], LONG POINTER TO LONG CARDINAL]^ _ TVToLC[tv];
RETURN};
ENDCASE => {
a: tp.ValueAddress _ GetValueAddress[tv];
WITH t: a SELECT FROM
constant => RETURN[t.value];
pointer => ptr _ t.ptr;
remotePointer => RETURN[GetRemoteWords[remotePointer: t.ptr, nWords: words]];
copiedRemoteObject => ptr _ t.ptr;
ENDCASE => ERROR;
s _ tvPrefixedZone.NEW[WordSequenceRecord[words]];
Inline.LongCOPY[from: ptr, nwords: words, to: @s[0]];
};
};

SetTVFromWordSequence: PUBLIC PROC[tv: AMTypes.TV, ws: WordSequence] = {
type: Type = AMTypes.TVType[tv];
a: RTTypesPrivate.ValueAddress =
RTTypesPrivate.GetValueAddress[tv: tv, mutableOnly: TRUE];
WITH t: a SELECT FROM
remotePointer => {
IF IsRC[type] THEN ERROR AMTypes.Error[reason: typeFault, type: type];
WITH fd: t.fd SELECT FROM
large => SELECT fd.size FROM
0 => {};
1 => {
lc: LONG CARDINAL _ LOOPHOLE[
(LONG[LOOPHOLE[ws[0], INTEGER]] - RTTypesPrivate.GetOrigin[type]),
LONG CARDINAL];
WorldVM.Write[
world: AMBridge.GetWorld[tv],
addr: t.ptr.ptr,
value: RTCommon.ShortenLongCardinal[lc]]};
ENDCASE => WorldVM.CopyWrite[
world: AMBridge.GetWorld[tv],
from: @ws[0],
nwords: ws.size,
to: t.ptr.ptr];
small => {
lc: LONG CARDINAL _ LOOPHOLE[
(LONG[LOOPHOLE[ws[0], INTEGER]] - RTTypesPrivate.GetOrigin[type]),
LONG CARDINAL];
IF Inline.BITSHIFT[1, fd.field.bitCount] <= lc
THEN ERROR Error[reason: rangeFault]; 
RTTypesRemotePrivate.RemoteStoreFieldLong[ptr: t.ptr, field: fd.field, value: lc]};
ENDCASE => ERROR};
copiedRemoteObject =>
WITH fd: t.fd SELECT FROM
large => SELECT fd.size FROM
0 => {};
1 => {
lc: LONG CARDINAL _ LOOPHOLE[
(LONG[LOOPHOLE[ws[0], INTEGER]] - RTTypesPrivate.GetOrigin[type]),
LONG CARDINAL];
LOOPHOLE[t.ptr, LONG POINTER TO CARDINAL]^
_ RTCommon.ShortenLongCardinal[lc]};
ENDCASE => Inline.LongCOPY[from: @ws[0], nwords: ws.size, to: t.ptr];
small => {
lc: LONG CARDINAL _ LOOPHOLE[
(LONG[LOOPHOLE[ws[0], INTEGER]] - RTTypesPrivate.GetOrigin[type]),
LONG CARDINAL];
IF Inline.BITSHIFT[1, fd.field.bitCount] <= lc
THEN ERROR Error[reason: rangeFault]; 
RTCommon.StoreFieldLong[t.ptr, fd.field, lc]};
ENDCASE => ERROR;
pointer => {
IF IsRC[type] THEN ERROR AMTypes.Error[reason: typeFault, type: type];
WITH fd: t.fd SELECT FROM
large => 
SELECT fd.size FROM
1 => {
lc: LONG CARDINAL
_ LOOPHOLE[(LONG[LOOPHOLE[ws[0], INTEGER]]
- RTTypesPrivate.GetOrigin[type]),
LONG CARDINAL];
LOOPHOLE[t.ptr, LONG POINTER TO CARDINAL]^
_ RTCommon.ShortenLongCardinal[lc]};
ENDCASE => Inline.LongCOPY[from: @ws[0], nwords: ws.size, to: t.ptr];
small => {
lc: LONG CARDINAL
_ LOOPHOLE[
(LONG[LOOPHOLE[ws[0], INTEGER]] - RTTypesPrivate.GetOrigin[type]),
LONG CARDINAL];
IF Inline.BITSHIFT[1, fd.field.bitCount] <= lc
THEN ERROR AMTypes.Error[reason: rangeFault]; 
RTCommon.StoreFieldLong[t.ptr, fd.field, lc]};
ENDCASE => ERROR};
ENDCASE => ERROR;
};

SetTVFromLC: PUBLIC PROC[tv: TypedVariable, lc: LONG CARDINAL] = {
a: tp.ValueAddress _ GetValueAddress[tv, TRUE];
type: Type = TVType[tv];
lc _ LOOPHOLE[(LOOPHOLE[lc, LONG INTEGER] - tp.GetOrigin[type]), LONG CARDINAL];
WITH t: a SELECT FROM
pointer => {
IF IsRC[type] THEN ERROR Error[reason: typeFault, type: type];
WITH fd: t.fd SELECT FROM
large => SELECT fd.size FROM
1 => LOOPHOLE[t.ptr, LONG POINTER TO CARDINAL]^ _ ShortenLongCardinal[lc];
2 => LOOPHOLE[t.ptr, LONG POINTER TO LONG CARDINAL]^ _ lc;
ENDCASE => ERROR Error[reason: typeFault, type: type];
small => {
IF Inline.BITSHIFT[1, fd.field.bitCount] <= lc
THEN ERROR Error[reason: rangeFault]; 
StoreFieldLong[t.ptr, fd.field, lc]};
ENDCASE => ERROR};
remotePointer => {
IF IsRC[type] THEN ERROR Error[reason: typeFault, type: type];
WITH fd: t.fd SELECT FROM
large => SELECT fd.size FROM
1 => RemoteStoreWord[t.ptr, ShortenLongCardinal[lc]];
2 => RemoteStoreDoubleWord[t.ptr, lc];
ENDCASE => ERROR Error[reason: typeFault, type: type];
small => {
IF Inline.BITSHIFT[1, fd.field.bitCount] <= lc
THEN ERROR Error[reason: rangeFault]; 
RemoteStoreFieldLong[ptr: t.ptr, field: fd.field, value: lc]};
ENDCASE => ERROR};
copiedRemoteObject =>
WITH fd: t.fd SELECT FROM
large => SELECT fd.size FROM
1 => LOOPHOLE[t.ptr, LONG POINTER TO CARDINAL]^ _ ShortenLongCardinal[lc];
2 => LOOPHOLE[t.ptr, LONG POINTER TO LONG CARDINAL]^ _ lc;
ENDCASE => ERROR Error[reason: typeFault, type: type];
small => {
IF Inline.BITSHIFT[1, fd.field.bitCount] <= lc THEN ERROR Error[reason: rangeFault]; 
StoreFieldLong[t.ptr, fd.field, lc]};
ENDCASE => ERROR;
ENDCASE => ERROR;
};

SetTVFromLI: PUBLIC PROC[tv: TypedVariable, li: LONG INTEGER] = {
a: tp.ValueAddress _ GetValueAddress[tv, TRUE];
type: Type = TVType[tv];
li _ li - tp.GetOrigin[type];
WITH t: a SELECT FROM
pointer => {
IF IsRC[type] THEN ERROR Error[reason: typeFault, type: type];
WITH fd: t.fd SELECT FROM
large => SELECT fd.size FROM
1 => LOOPHOLE[t.ptr, LONG POINTER TO INTEGER]^ _ ShortenLongInteger[li];
2 => LOOPHOLE[t.ptr, LONG POINTER TO LONG INTEGER]^ _ li;
ENDCASE => ERROR Error[reason: typeFault, type: type];
small => {lc: LONG CARDINAL = LOOPHOLE[li];
IF Inline.BITSHIFT[1, fd.field.bitCount] <= lc
THEN ERROR Error[reason: rangeFault]; 
StoreFieldLong[t.ptr, fd.field, lc]};
ENDCASE => ERROR};
remotePointer => {
IF IsRC[type] THEN ERROR Error[reason: typeFault, type: type];
WITH fd: t.fd SELECT FROM
large => SELECT fd.size FROM
1 => RemoteStoreWord[t.ptr, ShortenLongInteger[li]];
2 => RemoteStoreDoubleWord[t.ptr, li];
ENDCASE => ERROR Error[reason: typeFault, type: type];
small => {lc: LONG CARDINAL = LOOPHOLE[li];
IF Inline.BITSHIFT[1, fd.field.bitCount] <= lc
THEN ERROR Error[reason: rangeFault]; 
RemoteStoreFieldLong[ptr: t.ptr, field: fd.field, value: lc]};
ENDCASE => ERROR};
copiedRemoteObject =>
WITH fd: t.fd SELECT FROM
large => SELECT fd.size FROM
1 => LOOPHOLE[t.ptr, LONG POINTER TO INTEGER]^ _ ShortenLongInteger[li];
2 => LOOPHOLE[t.ptr, LONG POINTER TO LONG INTEGER]^ _ li;
ENDCASE => ERROR Error[reason: typeFault, type: type];
small => {
lc: LONG CARDINAL = LOOPHOLE[li];
IF Inline.BITSHIFT[1, fd.field.bitCount] <= lc THEN ERROR Error[reason: rangeFault]; 
StoreFieldLong[t.ptr, fd.field, lc]};
ENDCASE => ERROR;
ENDCASE => ERROR;
};

IsRC: PROC[type: Type] RETURNS[ans: BOOL] = {
RETURN[RTTypesBasicPrivate.MapTiRcmx[type] # RCMap.nullIndex]};

[qz: tvZone, pz: tvPrefixedZone] _ tp.GetTVZones[];

END.


ðRTTypesBridgeImpl.Mesa
last modified on March 10, 1983 9:08 am by Paul Rovner
Russ Atkinson, June 7, 1983 1:47 pm
RRA: fixed TVEq & TVEqual for frames
RRA: reformated; also fixed TVForPointerReferent to handle 0-width referents
T Y P E S
VARIABLES
PROCs exported to AMTypes
raises badTV
makes a REF ANY accessible as a TypedVariable.
makes a TypedVariable accessible as a REF ANY.
Raises internalTV if value is not a collectible object, notMutable if TVStatus[tv] # mutable. NOTE the result may carry a wider (narrower?) type!
raises internalTV Like RefFromTV, but accepts only readOnly TVs, returns REF READONLY.
Like RefFromTV, but copies instead of raising an error. 
raises typeFault
use TVToName to get the ROPE back
These procedures map Pointers, proc descs and frames to TypedVariables and vice versa.
raises typeFault
Raises internalTV if tv is embedded and not word aligned
Raises notMutable if TVStatus[tv] # mutable.
Raises notMutable
Two TypedVariables are Eq if they address the same bits.
Two TypedVariables are Equal if their values have the same size and the same bits.
NOTE there is no type checking in these comparisons.
These procedures make 1 or 2 word values available as bit patterns, and vice versa.
raises typeFault if the field is bigger than 2 words, else PUNs its value (right justified, zero filled) into a LONG CARDINAL.
sign extend.
raises rangeFault
raises typeFault, rangeFault
raises NotMutable if TVStatus[tv] # mutable; raises TypeFault if the tv type is RC or its value is bigger than 2 words, else PUNs lc into TVType[tv] and assigns it to the field specified by tv. NOTE this is a LOOPHOLE which may cause bounds checking to miss a bounds violation NOTE what about immutable variant records?
raises typeFault, rangeFault
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