-- file CodeDefs.mesa
-- last modified by Sweet, June 20, 1980 3:57 PM
-- last modified by Satterthwaite, June 15, 1982 10:29 am
DIRECTORY
Alloc: TYPE USING [Base, Notifier],
Environment: TYPE USING [Byte, bitsPerWord],
Literals: TYPE USING [LTIndex, LTNull, STIndex],
PrincOps: TYPE USING [MaxFrameSize],
Symbols: TYPE USING [
BTIndex, ContextLevel, HTIndex, ISEIndex, ISENull, lZ, RecordSEIndex],
SymbolSegment: TYPE USING [Tables],
Table: TYPE USING [Limit, Selector];
CodeDefs: DEFINITIONS =
BEGIN OPEN Symbols;
Byte: TYPE = Environment.Byte;
Base: TYPE = Alloc.Base;
Limit: CARDINAL = Table.Limit;
Lexeme: TYPE = RECORD [
lexvalue: SELECT lextag: * FROM
se => [lexsei: ISEIndex],
literal => [
SELECT littag: * FROM
word => [lexlti: Literals.LTIndex],
string => [lexsti: Literals.STIndex]
ENDCASE],
bdo => [lexbdoi: VarIndex],
stack => [lexsti: StackIndex]
ENDCASE];
NullLex: se Lexeme = Lexeme[se[Symbols.ISENull]];
MoveDirection: TYPE = {load, store};
VarSpace: TYPE = {faddr, frame, frameup, caddr, code, link, linkup, stack, const, pdesc};
VarTag: TYPE = {o, bo, bdo, ind};
VarComponent: TYPE = RECORD [
wSize: CARDINAL ← 0 | NULL,
bSize: [0..Environment.bitsPerWord) ← 0 | NULL,
space: SELECT tag: VarSpace FROM
frame => [
immutable: BOOLEAN ← FALSE,
level: ContextLevel ← lZ,
wd: CARDINAL ← 0,
bd: [0..Environment.bitsPerWord) ← 0],
code => [
bd: [0..Environment.bitsPerWord) ← 0,
wd: CARDINAL ← 0,
lti: Literals.LTIndex ← Literals.LTNull],
faddr => [wd: CARDINAL, level: ContextLevel],
frameup => [
level: ContextLevel ← lZ,
pwSize: [1..2] ← 1,
immutable: BOOLEAN ← FALSE,
wd: CARDINAL ← 0,
delta: [0..PrincOps.MaxFrameSize) ← 0],
caddr, link => [wd: CARDINAL],
linkup => [
wd: CARDINAL,
delta: [0..PrincOps.MaxFrameSize) ← 0],
stack => [
bd: [0..Environment.bitsPerWord) ← 0,
wd: CARDINAL ← 0,
sti: StackIndex],
const => [bd: [0..Environment.bitsPerWord) ← 0, d1, d2: UNSPECIFIED ← NULL],
pdesc => [ep: CARDINAL]
ENDCASE];
VarItem: TYPE = RECORD [ -- not many around simultaneously
free: BOOLEAN ← FALSE, -- required by allocator
body: SELECT tag: VarTag FROM
o => [var: VarComponent],
bo => [offset, base: VarComponent],
bdo => [offset, base, disp: VarComponent],
ind => [
offset, base, index: VarComponent,
simple: BOOLEAN,
packinfo: SELECT packtag: * FROM
packed => [grain: [1..Environment.bitsPerWord)],
notPacked => [eWords: [0..PrincOps.MaxFrameSize)]
ENDCASE]
ENDCASE];
VarIndex: TYPE = Base RELATIVE POINTER [0..Limit) TO VarItem;
OVarIndex: TYPE = Base RELATIVE POINTER [0..Limit) TO o VarItem;
BoVarIndex: TYPE = Base RELATIVE POINTER [0..Limit) TO bo VarItem;
BdoVarIndex: TYPE = Base RELATIVE POINTER [0..Limit) TO bdo VarItem;
IndVarIndex: TYPE = Base RELATIVE POINTER [0..Limit) TO ind VarItem;
VarNull: VarIndex = FIRST[VarIndex];
RelativePC: TYPE = [0..77777B];
CCInfoType: TYPE = {generating, binding, coding};
CodeChunkType: TYPE = {code, label, jump, other};
CCItem: TYPE = RECORD [
free: BOOLEAN,
pad: [0..1], -- this is NOT a fill field
flink, blink: CCIndex,
ccvalue: SELECT cctag: CodeChunkType FROM
code => [
realinst, minimalStack: BOOLEAN,
inst: Byte,
aligned: BOOLEAN,
isize: [0..3],
fill: [0..7B],
parameters: ARRAY [1..1) OF WORD],
label => [
labelseen: BOOLEAN,
labelinfo: SELECT OVERLAID CCInfoType FROM
generating => [filltoword, jumplist: JumpCCIndex],
binding => [minPC, maxPC: RelativePC],
coding => [filltoword, pc: RelativePC],
ENDCASE],
jump => [
jsize: [0..7],
jtype: JumpType,
jparam: Byte,
fixedup, completed: BOOLEAN,
destlabel: LabelCCIndex,
forward: BOOLEAN,
jumpinfo: SELECT OVERLAID CCInfoType FROM
generating => [filltoword, thread: JumpCCIndex],
binding => [minPC, maxPC: RelativePC],
coding => [filltoword, pc: RelativePC]
ENDCASE],
other => [obody: SELECT otag: * FROM
table => [
btab: BOOLEAN,
tablecodebytes: [0..7],
taboffset: INTEGER],
markbody => [
start: BOOLEAN,
index: BTIndex],
relSource => [relIndex: RelFileIndex], -- relative to proc body
absSource => [index: CARDINAL]
ENDCASE]
ENDCASE];
RelFileIndex: TYPE = [0..37777b];
NULLfileindex: CARDINAL = LAST[CARDINAL];
CCIndex: TYPE = Base RELATIVE POINTER [0..Limit) TO CCItem;
CCNull: CCIndex = FIRST[CCIndex];
JumpCCIndex: TYPE = Base RELATIVE POINTER [0..Limit) TO jump CCItem;
JumpCCNull: JumpCCIndex = LOOPHOLE[CCNull];
LabelCCIndex: TYPE = Base RELATIVE POINTER [0..Limit) TO label CCItem;
LabelCCNull: LabelCCIndex = LOOPHOLE[CCNull];
CodeCCIndex: TYPE = Base RELATIVE POINTER [0..Limit) TO code CCItem;
CodeCCNull: CodeCCIndex = LOOPHOLE[CCNull];
OtherCCIndex: TYPE = Base RELATIVE POINTER [0..Limit) TO other CCItem;
TableCCIndex: TYPE = Base RELATIVE POINTER [0..Limit) TO table other CCItem;
TableCCNull: TableCCIndex = LOOPHOLE[CCNull];
CJItem: TYPE = RECORD [
inst: CCIndex,
variant: SELECT tag:* FROM
fallIn => [lc: LabelCCIndex],
jumpIn => [jc: JumpCCIndex]
ENDCASE];
CompareClass: TYPE = {word, byte};
JumpType: TYPE = {
JumpE, JumpN, JumpL, JumpGE, JumpG, JumpLE,
UJumpL, UJumpGE, UJumpG, UJumpLE, ZJumpE, ZJumpN,
Jump, JumpA, JumpC, JumpCA, JumpRet,
NILJumpE, NILJumpN, PAIRJumpL, PAIRJumpG,
BYTEJumpE, BYTEJumpN, BITJumpE, BITJumpN};
LabelInfoRecord: TYPE = RECORD [
free: BOOLEAN ← FALSE,
thread: LabelInfoIndex,
catchLevel: [0..37777B],
body: SELECT tag:* FROM
named => [hti: HTIndex, cci: LabelCCIndex],
loop => [exit, loop: LabelCCIndex],
stmt => [retry, continue: LabelCCIndex]
ENDCASE];
LabelInfoIndex: TYPE =
Base RELATIVE POINTER [0..Limit) TO LabelInfoRecord;
NamedLabelInfoIndex: TYPE =
Base RELATIVE POINTER [0..Limit) TO named LabelInfoRecord;
LabelInfoNull: LabelInfoIndex = FIRST[LabelInfoIndex];
StackIndex: TYPE = Base RELATIVE POINTER [0..Limit) TO StackItem;
StackNull: StackIndex = FIRST[StackIndex];
StackItem: TYPE = RECORD [
free: BOOLEAN ← FALSE,
uplink, downlink: StackIndex ← StackNull,
data: SELECT tag:* FROM
mark => [label: LabelCCIndex],
onStack => [
alsoLink: BOOLEAN ← FALSE,
tLevel: Symbols.ContextLevel ← lZ,
tOffset: TempAddr ← NULL],
inTemp => [
tLevel: Symbols.ContextLevel,
tOffset: TempAddr],
inLink => [link: Byte]
ENDCASE];
-- if alsoTemp for onStack element, it has been previously dumped
-- by the stack machinery into the given temp.
StackPos: TYPE = [0..16);
StackLocRec: TYPE = RECORD [SELECT tag:* FROM
onStack => [depth: CARDINAL],
inTemp => [
tSize: TempSize,
tLevel: Symbols.ContextLevel,
tOffset: TempAddr],
inLink => [link: [0..256)],
mixed => []
ENDCASE];
-- StackLocRec semantics:
-- obtained by lr: StackLocRec ← Stack.Loc[s, count];
--
-- Tag Meaning
--
-- onStack The "count" words are all on the stack.
-- There are "depth" words above them in the model
-- inTemp The "count" words are in contiguous temporaries
-- inLink "count" = 1 and value is in link "link"
-- mixed None of the above
EvalStackSize: CARDINAL = 14;
MaxParmsInStack: CARDINAL = EvalStackSize - 3;
TempAddr: TYPE = [0..PrincOps.MaxFrameSize);
TempSize: TYPE = [0..PrincOps.MaxFrameSize);
TempStateRecord: TYPE = RECORD[
pendtemplist, templist, heaplist: ISEIndex,
tempctxlvl: ContextLevel,
firstTemp, tempstart, framesz: INTEGER];
CaseCVState: TYPE = {single, singleLoaded, multi, none};
StoreOptions: TYPE = RECORD [
expr: BOOLEAN ← FALSE,
init: BOOLEAN ← FALSE,
counted: BOOLEAN ← FALSE,
composite: BOOLEAN ← FALSE];
ConsDestination: TYPE = RECORD [
bd: [0..Environment.bitsPerWord) ← NULL,
bSize: [0..Environment.bitsPerWord) ← NULL,
inFrame: BOOLEAN ← FALSE, -- can store directly into frame
fLevel: Symbols.ContextLevel ← NULL,
pLength: [1..2] ← 1,
ignoreSafen: BOOLEAN ← FALSE,
fOffset: CARDINAL ← NULL, -- offset of first word of record
pLoaded: BOOLEAN ← FALSE, -- pointer already on virtual stack
pSti: StackIndex ← NULL, -- the sti of the pointer if pLoaded
pDelta: INTEGER ← 0, -- word offset into record of pointer
pLink: BOOLEAN ← FALSE, -- pointer also in a link
pLevel: Symbols.ContextLevel ← lZ, -- if not lZ, then ptr is in temp
pOffset: TempAddr ← NULL, -- frame offset of temp or link
remaining: CARDINAL ← 0,
wSize: CARDINAL ← NULL,
options: StoreOptions ← []];
StatementStateRecord: TYPE = RECORD [
retLabel, comRetLabel: LabelCCIndex,
outRecord: RecordSEIndex,
pendtemplist: ISEIndex,
stkPtr: UNSPECIFIED,
inlineFileIndex: CARDINAL];
ChunkIndex: TYPE = Base RELATIVE POINTER [0..Limit);
codeType: Table.Selector = LAST[SymbolSegment.Tables]+1;
AddressNotify, CallsNotify, ConstructorNotify, CountingNotify,
CrossJumpNotify, DJumpsNotify, ExpressionNotify, FinalNotify,
FlowNotify, FlowExpressionNotify, OutCodeNotify, PeepholeNotify,
StatementNotify, SelectionNotify, StoreNotify, TempNotify,
VarBasicsNotify, VarMoveNotify, VarUtilsNotify:
Alloc.Notifier;
END.