--
-- mc-4.bnf grammar and associated actions for mcp4.
--
-- Copyright (C) 2016-2023 Free Software Foundation, Inc.
-- Contributed by Gaius Mulley <gaius.mulley@southwales.ac.uk>.
--
-- This file is part of GNU Modula-2.
--
-- GNU Modula-2 is free software; you can redistribute it and/or modify
-- it under the terms of the GNU General Public License as published by
-- the Free Software Foundation; either version 3, or (at your option)
-- any later version.
--
-- GNU Modula-2 is distributed in the hope that it will be useful, but
-- WITHOUT ANY WARRANTY; without even the implied warranty of
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
-- General Public License for more details.
--
-- You should have received a copy of the GNU General Public License
-- along with GNU Modula-2; see the file COPYING3. If not see
-- <http://www.gnu.org/licenses/>.
% module mcp4 begin
(* output from mc-4.bnf, automatically generated do not edit.
Copyright (C) 2016-2023 Free Software Foundation, Inc.
Contributed by Gaius Mulley <gaius.mulley@southwales.ac.uk>.
This file is part of GNU Modula-2.
GNU Modula-2 is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
GNU Modula-2 is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNU Modula-2; see the file COPYING. If not,
see <https://www.gnu.org/licenses/>. *)
IMPLEMENTATION MODULE mcp4 ;
FROM DynamicStrings IMPORT String, InitString, KillString, Mark,
ConCat, ConCatChar ;
FROM mcError IMPORT errorStringAt ;
FROM nameKey IMPORT NulName, Name, makekey ;
FROM mcPrintf IMPORT printf0, printf1 ;
FROM mcDebug IMPORT assert ;
FROM mcReserved IMPORT toktype ;
FROM mcMetaError IMPORT metaError1, metaError2 ;
FROM mcStack IMPORT stack ;
IMPORT mcStack ;
FROM mcLexBuf IMPORT currentstring, currenttoken, getToken, insertToken,
insertTokenAndRewind, getTokenNo ;
FROM decl IMPORT node, lookupDef, lookupImp, lookupModule, getSymName,
enterScope, leaveScope,
putType, lookupSym, isDef, makeSubrange,
makeSet, makePointer, makeProcType,
addParameter,
makeVarargs, makeVarParameter, makeNonVarParameter,
putSubrangeType, putConst,
makeArray, putUnbounded, getCardinal, makeBinaryTok, makeUnaryTok,
makeRecord, isRecord, isRecordField, isVarientField, makeVarient,
addFieldsToRecord, isVarient, buildVarientSelector,
buildVarientFieldRecord, makeVarDecl, paramEnter, paramLeave,
makeIdentList, putIdent, addVarParameters, addNonVarParameters,
lookupInScope, import, lookupExported, isImp, isModule, isConst,
makeLiteralInt, makeLiteralReal, makeString, getBuiltinConst,
getNextConstExp, fixupConstExp, makeFuncCall,
makeExpList, putExpList, isExpList,
makeSetValue, putSetValue, includeSetValue,
addCommentBody,
resetConstExpPos ;
CONST
Pass1 = FALSE ;
Debugging = FALSE ;
VAR
WasNoError : BOOLEAN ;
curstring,
curident : Name ;
curproc,
typeDes,
typeExp,
curmodule : node ;
stk : stack ;
(*
push -
*)
PROCEDURE push (n: node) : node ;
BEGIN
RETURN mcStack.push (stk, n)
END push ;
(*
pop -
*)
PROCEDURE pop () : node ;
BEGIN
RETURN mcStack.pop (stk)
END pop ;
(*
replace -
*)
PROCEDURE replace (n: node) : node ;
BEGIN
RETURN mcStack.replace (stk, n)
END replace ;
(*
peep - returns the top node on the stack without removing it.
*)
PROCEDURE peep () : node ;
BEGIN
RETURN push (pop ())
END peep ;
(*
depth - returns the depth of the stack.
*)
PROCEDURE depth () : CARDINAL ;
BEGIN
RETURN mcStack.depth (stk)
END depth ;
(*
checkDuplicate -
*)
PROCEDURE checkDuplicate (b: BOOLEAN) ;
BEGIN
END checkDuplicate ;
PROCEDURE ErrorString (s: String) ;
BEGIN
errorStringAt (s, getTokenNo ()) ;
WasNoError := FALSE
END ErrorString ;
PROCEDURE ErrorArray (a: ARRAY OF CHAR) ;
BEGIN
ErrorString (InitString (a))
END ErrorArray ;
(*
pushNunbounded -
*)
PROCEDURE pushNunbounded (c: CARDINAL) ;
VAR
type,
array,
subrange: node ;
BEGIN
WHILE c#0 DO
type := pop () ;
subrange := makeSubrange (NIL, NIL) ;
putSubrangeType (subrange, getCardinal ()) ;
array := makeArray (subrange, type) ;
putUnbounded (array) ;
type := push (array) ;
DEC (c)
END
END pushNunbounded ;
(*
makeIndexedArray - builds and returns an array of type, t, with, c, indices.
*)
PROCEDURE makeIndexedArray (c: CARDINAL; t: node) : node ;
VAR
i: node ;
BEGIN
WHILE c>0 DO
t := makeArray (pop (), t) ;
DEC (c)
END ;
RETURN t
END makeIndexedArray ;
(*
importInto - from, m, import, name, into module, current.
It checks to see if curident is an enumeration type
and if so automatically includes all enumeration fields
as well.
*)
PROCEDURE importInto (m: node; name: Name; current: node) ;
VAR
s, o: node ;
BEGIN
assert (isDef (m)) ;
assert (isDef (current) OR isModule (current) OR isImp (current)) ;
s := lookupExported (m, name) ;
IF s=NIL
THEN
metaError2 ('{%1k} was not exported from definition module {%2a}', name, m)
ELSE
o := import (current, s) ;
IF s#o
THEN
metaError2 ('{%1ad} cannot be imported into the current module as it causes a name clash with {%2ad}',
s, o)
END
END
END importInto ;
(*
checkEndName - if module does not have, name, then issue an error containing, desc.
*)
PROCEDURE checkEndName (module: node; name: Name; desc: ARRAY OF CHAR) ;
VAR
s: String ;
BEGIN
IF getSymName (module)#name
THEN
s := InitString ('inconsistent module name found with this ') ;
s := ConCat (s, Mark (InitString (desc))) ;
ErrorString (s)
END
END checkEndName ;
% declaration mcp4 begin
(*
SyntaxError - after a syntax error we skip all tokens up until we reach
a stop symbol.
*)
PROCEDURE SyntaxError (stopset0: SetOfStop0; stopset1: SetOfStop1; stopset2: SetOfStop2) ;
BEGIN
DescribeError ;
IF Debugging
THEN
printf0('\nskipping token *** ')
END ;
(*
yes the ORD(currenttoken) looks ugly, but it is *much* safer than
using currenttoken<sometok as a change to the ordering of the
token declarations below would cause this to break. Using ORD() we are
immune from such changes
*)
WHILE NOT (((ORD(currenttoken)<32) AND (currenttoken IN stopset0)) OR
((ORD(currenttoken)>=32) AND (ORD(currenttoken)<64) AND (currenttoken IN stopset1)) OR
((ORD(currenttoken)>=64) AND (currenttoken IN stopset2)))
DO
getToken
END ;
IF Debugging
THEN
printf0(' ***\n')
END
END SyntaxError ;
(*
SyntaxCheck -
*)
PROCEDURE SyntaxCheck (stopset0: SetOfStop0; stopset1: SetOfStop1; stopset2: SetOfStop2) ;
BEGIN
(* and again (see above re: ORD)
*)
IF NOT (((ORD(currenttoken)<32) AND (currenttoken IN stopset0)) OR
((ORD(currenttoken)>=32) AND (ORD(currenttoken)<64) AND (currenttoken IN stopset1)) OR
((ORD(currenttoken)>=64) AND (currenttoken IN stopset2)))
THEN
SyntaxError (stopset0, stopset1, stopset2)
END
END SyntaxCheck ;
(*
WarnMissingToken - generates a warning message about a missing token, t.
*)
PROCEDURE WarnMissingToken (t: toktype) ;
VAR
s0 : SetOfStop0 ;
s1 : SetOfStop1 ;
s2 : SetOfStop2 ;
str: String ;
BEGIN
s0 := SetOfStop0{} ;
s1 := SetOfStop1{} ;
s2 := SetOfStop2{} ;
IF ORD(t)<32
THEN
s0 := SetOfStop0{t}
ELSIF ORD(t)<64
THEN
s1 := SetOfStop1{t}
ELSE
s2 := SetOfStop2{t}
END ;
str := DescribeStop (s0, s1, s2) ;
str := ConCat (InitString ('syntax error,'), Mark (str)) ;
errorStringAt (str, getTokenNo ())
END WarnMissingToken ;
(*
MissingToken - generates a warning message about a missing token, t.
*)
PROCEDURE MissingToken (t: toktype) ;
BEGIN
WarnMissingToken (t) ;
IF (t#identtok) AND (t#integertok) AND (t#realtok) AND (t#stringtok)
THEN
IF Debugging
THEN
printf0 ('inserting token\n')
END ;
insertToken (t)
END
END MissingToken ;
(*
CheckAndInsert -
*)
PROCEDURE CheckAndInsert (t: toktype; stopset0: SetOfStop0; stopset1: SetOfStop1; stopset2: SetOfStop2) : BOOLEAN ;
BEGIN
IF ((ORD(t)<32) AND (t IN stopset0)) OR
((ORD(t)>=32) AND (ORD(t)<64) AND (t IN stopset1)) OR
((ORD(t)>=64) AND (t IN stopset2))
THEN
WarnMissingToken (t) ;
insertTokenAndRewind (t) ;
RETURN( TRUE )
ELSE
RETURN( FALSE )
END
END CheckAndInsert ;
(*
InStopSet
*)
PROCEDURE InStopSet (t: toktype; stopset0: SetOfStop0; stopset1: SetOfStop1; stopset2: SetOfStop2) : BOOLEAN ;
BEGIN
IF ((ORD(t)<32) AND (t IN stopset0)) OR
((ORD(t)>=32) AND (ORD(t)<64) AND (t IN stopset1)) OR
((ORD(t)>=64) AND (t IN stopset2))
THEN
RETURN( TRUE )
ELSE
RETURN( FALSE )
END
END InStopSet ;
(*
PeepToken - peep token checks to see whether the stopset is satisfied by currenttoken
If it is not then it will insert a token providing the token
is one of ; ] ) } . OF END ,
if the stopset contains <identtok> then we do not insert a token
*)
PROCEDURE PeepToken (stopset0: SetOfStop0; stopset1: SetOfStop1; stopset2: SetOfStop2) ;
BEGIN
(* and again (see above re: ORD)
*)
IF (NOT (((ORD(currenttoken)<32) AND (currenttoken IN stopset0)) OR
((ORD(currenttoken)>=32) AND (ORD(currenttoken)<64) AND (currenttoken IN stopset1)) OR
((ORD(currenttoken)>=64) AND (currenttoken IN stopset2)))) AND
(NOT InStopSet(identtok, stopset0, stopset1, stopset2))
THEN
(* SyntaxCheck would fail since currentoken is not part of the stopset
we check to see whether any of currenttoken might be a commonly omitted token *)
IF CheckAndInsert(semicolontok, stopset0, stopset1, stopset2) OR
CheckAndInsert(rsbratok, stopset0, stopset1, stopset2) OR
CheckAndInsert(rparatok, stopset0, stopset1, stopset2) OR
CheckAndInsert(rcbratok, stopset0, stopset1, stopset2) OR
CheckAndInsert(periodtok, stopset0, stopset1, stopset2) OR
CheckAndInsert(oftok, stopset0, stopset1, stopset2) OR
CheckAndInsert(endtok, stopset0, stopset1, stopset2) OR
CheckAndInsert(commatok, stopset0, stopset1, stopset2)
THEN
END
END
END PeepToken ;
(*
Expect -
*)
PROCEDURE Expect (t: toktype; stopset0: SetOfStop0; stopset1: SetOfStop1; stopset2: SetOfStop2) ;
BEGIN
IF currenttoken=t
THEN
getToken ;
IF Pass1
THEN
PeepToken(stopset0, stopset1, stopset2)
END
ELSE
MissingToken(t)
END ;
SyntaxCheck(stopset0, stopset1, stopset2)
END Expect ;
(*
CompilationUnit - returns TRUE if the input was correct enough to parse
in future passes.
*)
PROCEDURE CompilationUnit () : BOOLEAN ;
BEGIN
stk := mcStack.init () ;
WasNoError := TRUE ;
FileUnit(SetOfStop0{eoftok}, SetOfStop1{}, SetOfStop2{}) ;
mcStack.kill (stk) ;
RETURN WasNoError
END CompilationUnit ;
(*
Ident - error checking varient of Ident
*)
PROCEDURE Ident (stopset0: SetOfStop0; stopset1: SetOfStop1; stopset2: SetOfStop2) ;
BEGIN
curident := makekey (currentstring) ;
Expect(identtok, stopset0, stopset1, stopset2)
END Ident ;
(*
string -
*)
PROCEDURE string (stopset0: SetOfStop0; stopset1: SetOfStop1; stopset2: SetOfStop2) ;
BEGIN
curstring := makekey (currentstring) ;
Expect(stringtok, stopset0, stopset1, stopset2)
END string ;
(*
Integer -
*)
PROCEDURE Integer (stopset0: SetOfStop0; stopset1: SetOfStop1; stopset2: SetOfStop2) ;
VAR
n: node ;
BEGIN
n := push (makeLiteralInt (makekey (currentstring))) ;
Expect(integertok, stopset0, stopset1, stopset2)
END Integer ;
(*
Real -
*)
PROCEDURE Real (stopset0: SetOfStop0; stopset1: SetOfStop1; stopset2: SetOfStop2) ;
VAR
n: node ;
BEGIN
n := push (makeLiteralReal (makekey (currentstring))) ;
Expect(realtok, stopset0, stopset1, stopset2)
END Real ;
% module mcp4 end
END mcp4.
% rules
error 'ErrorArray' 'ErrorString'
tokenfunc 'currenttoken'
token '' eoftok -- internal token
token '+' plustok
token '-' minustok
token '*' timestok
token '/' dividetok
token ':=' becomestok
token '&' ambersandtok
token "." periodtok
token "," commatok
token ";" semicolontok
token '(' lparatok
token ')' rparatok
token '[' lsbratok -- left square brackets
token ']' rsbratok -- right square brackets
token '{' lcbratok -- left curly brackets
token '}' rcbratok -- right curly brackets
token '^' uparrowtok
token "'" singlequotetok
token '=' equaltok
token '#' hashtok
token '<' lesstok
token '>' greatertok
token '<>' lessgreatertok
token '<=' lessequaltok
token '>=' greaterequaltok
token '<*' ldirectivetok
token '*>' rdirectivetok
token '..' periodperiodtok
token ':' colontok
token '"' doublequotestok
token '|' bartok
token 'AND' andtok
token 'ARRAY' arraytok
token 'BEGIN' begintok
token 'BY' bytok
token 'CASE' casetok
token 'CONST' consttok
token 'DEFINITION' definitiontok
token 'DIV' divtok
token 'DO' dotok
token 'ELSE' elsetok
token 'ELSIF' elsiftok
token 'END' endtok
token 'EXCEPT' excepttok
token 'EXIT' exittok
token 'EXPORT' exporttok
token 'FINALLY' finallytok
token 'FOR' fortok
token 'FROM' fromtok
token 'IF' iftok
token 'IMPLEMENTATION' implementationtok
token 'IMPORT' importtok
token 'IN' intok
token 'LOOP' looptok
token 'MOD' modtok
token 'MODULE' moduletok
token 'NOT' nottok
token 'OF' oftok
token 'OR' ortok
token 'PACKEDSET' packedsettok
token 'POINTER' pointertok
token 'PROCEDURE' proceduretok
token 'QUALIFIED' qualifiedtok
token 'UNQUALIFIED' unqualifiedtok
token 'RECORD' recordtok
token 'REM' remtok
token 'REPEAT' repeattok
token 'RETRY' retrytok
token 'RETURN' returntok
token 'SET' settok
token 'THEN' thentok
token 'TO' totok
token 'TYPE' typetok
token 'UNTIL' untiltok
token 'VAR' vartok
token 'WHILE' whiletok
token 'WITH' withtok
token 'ASM' asmtok
token 'VOLATILE' volatiletok
token '...' periodperiodperiodtok
token '__DATE__' datetok
token '__LINE__' linetok
token '__FILE__' filetok
token '__ATTRIBUTE__' attributetok
token '__BUILTIN__' builtintok
token '__INLINE__' inlinetok
token 'integer number' integertok
token 'identifier' identtok
token 'real number' realtok
token 'string' stringtok
special Ident first { < identtok > } follow { }
special Integer first { < integertok > } follow { }
special Real first { < realtok > } follow { }
special string first { < stringtok > } follow { }
BNF
-- the following are provided by the module m2flex and also handbuild procedures below
-- Ident := Letter { ( Letter | Digit ) } =:
-- Integer := Digit { Digit } | OctalDigit { OctalDigit } ( " B " | " C " ) |
-- Digit { HexDigit } " H " =:
-- Real := Digit { Digit } " . " { Digit } [ ScaleFactor ] =:
-- ScaleFactor := " E " [ ( " + " | " - " ) ] Digit { Digit } =:
-- HexDigit := Digit | " A " | " B " | " C " | " D " | " E " | " F " =:
-- Digit := OctalDigit | " 8 " | " 9 " =:
-- OctalDigit := "0" | "1" | "2" | "3" | "4" | "5" | "6" | "7" =:
-- String
FileUnit := DefinitionModule | ImplementationOrProgramModule
=:
ProgramModule := "MODULE"
Ident % curmodule := lookupModule (curident) %
% enterScope (curmodule) %
% resetConstExpPos (curmodule) %
[ Priority
]
";"
{ Import }
Block
Ident % checkEndName (curmodule, curident, 'program module') %
% leaveScope %
"."
=:
ImplementationModule := "IMPLEMENTATION" "MODULE"
Ident % curmodule := lookupImp (curident) %
% enterScope (lookupDef (curident)) %
% enterScope (curmodule) %
% resetConstExpPos (curmodule) %
[ Priority
] ";"
{ Import }
Block
Ident % checkEndName (curmodule, curident, 'implementation module') %
% leaveScope ; leaveScope %
"."
=:
ImplementationOrProgramModule := ImplementationModule | ProgramModule
=:
Number := Integer | Real =:
Qualident :=
Ident { "." Ident }
=:
ConstantDeclaration := % VAR d, e: node ; %
Ident % d := lookupSym (curident) %
"=" ConstExpression % e := pop () %
% assert (isConst (d)) %
% putConst (d, e) %
=:
ConstExpression := % VAR c, l, r: node ; op: toktype ; d: CARDINAL ; %
% d := depth () %
% c := push (getNextConstExp ()) %
SimpleConstExpr
% op := currenttoken %
[ Relation
SimpleConstExpr
% r := pop () %
% l := pop () %
% l := push (makeBinaryTok (op, l, r)) %
]
% c := replace (fixupConstExp (c, pop ())) %
% assert (d+1 = depth ()) %
=:
Relation := "="
| "#"
| "<>"
| "<"
| "<="
| ">"
| ">="
| "IN"
=:
SimpleConstExpr := % VAR op: toktype ; n: node ; %
UnaryOrConstTerm % n := pop () %
{ % op := currenttoken %
AddOperator ConstTerm % n := makeBinaryTok (op, n, pop ()) %
} % n := push (n) %
=:
UnaryOrConstTerm := % VAR n: node ; %
"+"
ConstTerm % n := push (makeUnaryTok (plustok, pop ())) %
|
"-"
ConstTerm % n := push (makeUnaryTok (minustok, pop ())) %
|
ConstTerm =:
AddOperator := "+"
| "-"
| "OR"
=:
ConstTerm := % VAR op: toktype ; n: node ; %
ConstFactor % n := pop () %
{ % op := currenttoken %
MulOperator ConstFactor % n := makeBinaryTok (op, n, pop ()) %
} % n := push (n) %
=:
MulOperator := "*"
| "/"
| "DIV"
| "MOD"
| "REM"
| "AND"
| "&"
=:
NotConstFactor := "NOT" ConstFactor % VAR n: node ; %
% n := push (makeUnaryTok (nottok, pop ())) %
=:
ConstFactor := Number | ConstString | ConstSetOrQualidentOrFunction |
"(" ConstExpression ")" | NotConstFactor
| ConstAttribute =:
-- to help satisfy LL1
ConstString := string % VAR n: node ; %
% n := push (makeString (curstring)) %
=:
ConstComponentElement := ConstExpression % VAR l, h, n: node ; %
% l := pop () %
% h := NIL %
[ ".." ConstExpression % h := pop () %
% ErrorArray ('implementation restriction range is not allowed') %
] % n := push (includeSetValue (pop (), l, h)) %
=:
ConstComponentValue := ConstComponentElement [ 'BY' % ErrorArray ('implementation restriction BY not allowed') %
ConstExpression ]
=:
ConstArraySetRecordValue := ConstComponentValue { ',' ConstComponentValue }
=:
ConstConstructor := '{' % VAR n: node ; %
% n := push (makeSetValue ()) %
[ ConstArraySetRecordValue ]
'}' =:
ConstSetOrQualidentOrFunction := % VAR q, p, n: node ; d: CARDINAL ; %
% d := depth () %
PushQualident
% assert (d+1 = depth ()) %
[ ConstConstructor % p := pop () %
% q := pop () %
% n := push (putSetValue (p, q)) %
% assert (d+1 = depth ()) %
| ConstActualParameters % p := pop () %
% q := pop () %
% n := push (makeFuncCall (q, p)) %
% assert (d+1 = depth ()) %
]
| % d := depth () %
ConstConstructor % assert (d+1 = depth ()) %
=:
ConstActualParameters := "(" % VAR n: node ; %
% n := push (makeExpList ()) %
[ ConstExpList ] ")" % assert (isExpList (peep ())) %
=:
ConstExpList := % VAR p, n: node ; %
% p := peep () %
% assert (isExpList (p)) %
ConstExpression % putExpList (p, pop ()) %
% assert (p = peep ()) %
% assert (isExpList (peep ())) %
{ "," ConstExpression % putExpList (p, pop ()) %
% assert (isExpList (peep ())) %
}
=:
ConstAttribute := "__ATTRIBUTE__" "__BUILTIN__" "(" "("
ConstAttributeExpression
")" ")" =:
ConstAttributeExpression :=
Ident % VAR n: node ; %
% n := push (getBuiltinConst (curident)) %
| "<" Qualident ',' Ident
">"
=:
ByteAlignment := '<*' AttributeExpression '*>'
=:
OptAlignmentExpression := [ AlignmentExpression ] =:
AlignmentExpression := "(" ConstExpression ")" =:
Alignment := [ ByteAlignment ] =:
IdentList := Ident { "," Ident }
=:
PushIdentList := % VAR n: node ; %
% n := makeIdentList () %
Ident % checkDuplicate (putIdent (n, curident)) %
{ "," Ident % checkDuplicate (putIdent (n, curident)) %
} % n := push (n) %
=:
SubrangeType := "[" ConstExpression ".." ConstExpression "]" =:
ArrayType := "ARRAY" SimpleType { "," SimpleType } "OF" Type =:
RecordType := "RECORD" [ DefaultRecordAttributes ]
FieldListSequence
"END" =:
DefaultRecordAttributes := '<*' AttributeExpression '*>' =:
RecordFieldPragma := [ '<*' FieldPragmaExpression
{ ',' FieldPragmaExpression } '*>' ] =:
FieldPragmaExpression := Ident PragmaConstExpression =:
PragmaConstExpression := [ '(' ConstExpression ')' ] =:
AttributeExpression := Ident '(' ConstExpression ')' =:
FieldListSequence := FieldListStatement { ";" FieldListStatement } =:
FieldListStatement := [ FieldList ] =:
FieldList := IdentList ":" Type RecordFieldPragma
| "CASE" CaseTag "OF" Varient { "|" Varient }
[ "ELSE"
FieldListSequence
] "END"
=:
TagIdent := Ident | % curident := NulName %
=:
CaseTag := TagIdent [ ":" Qualident ]
=:
Varient := [ VarientCaseLabelList ":" FieldListSequence ] =:
VarientCaseLabelList := VarientCaseLabels { "," VarientCaseLabels } =:
VarientCaseLabels := ConstExpression [ ".." ConstExpression ]
=:
SetType := ( "SET" | "PACKEDSET" ) "OF" SimpleType =:
PointerType := "POINTER" "TO" Type =:
ProcedureType := "PROCEDURE" [ FormalTypeList ] =:
FormalTypeList := "(" ( ")" FormalReturn |
ProcedureParameters ")" FormalReturn ) =:
FormalReturn := [ ":" OptReturnType ] =:
OptReturnType := "[" Qualident "]" | Qualident
=:
ProcedureParameters := ProcedureParameter
{ "," ProcedureParameter } =:
ProcedureParameter := "..." | "VAR" FormalType | FormalType =:
VarIdent := Ident [ "[" ConstExpression % VAR n: node ; %
% n := pop () %
"]" ]
=:
VarIdentList := VarIdent { "," VarIdent }
=:
VariableDeclaration := VarIdentList ":"
Type Alignment
=:
Designator := Qualident
{ SubDesignator } =:
SubDesignator := "."
Ident
| "[" ArrayExpList
"]"
| "^"
=:
ArrayExpList :=
Expression
{ ","
Expression
}
=:
ExpList := Expression { "," Expression }
=:
Expression := SimpleExpression [ Relation SimpleExpression ]
=:
SimpleExpression := UnaryOrTerm { AddOperator Term } =:
UnaryOrTerm := "+" Term
| "-" Term
| Term
=:
Term := Factor { MulOperator Factor
} =:
Factor := Number | string | SetOrDesignatorOrFunction |
"(" Expression ")" | "NOT" ( Factor
| ConstAttribute
) =:
ComponentElement := Expression
[ ".." Expression % ErrorArray ('implementation restriction range not allowed') %
]
=:
ComponentValue := ComponentElement [ 'BY' % ErrorArray ('implementation restriction BY not allowed') %
Expression ]
=:
ArraySetRecordValue := ComponentValue { ',' ComponentValue }
=:
Constructor := '{' [ ArraySetRecordValue ] '}' =:
SetOrDesignatorOrFunction := Qualident
[ Constructor |
SimpleDes [ ActualParameters ]
] |
Constructor =:
-- SimpleDes := { "." Ident | "[" ExpList "]" | "^" } =:
SimpleDes := { SubDesignator } =:
ActualParameters := "(" [ ExpList ] ")" =:
ExitStatement := "EXIT"
=:
ReturnStatement := "RETURN" [ Expression ]
=:
Statement := [ AssignmentOrProcedureCall | IfStatement | CaseStatement |
WhileStatement | RepeatStatement | LoopStatement |
ForStatement | WithStatement | AsmStatement |
ExitStatement | ReturnStatement | RetryStatement
]
=:
RetryStatement := "RETRY"
=:
AssignmentOrProcedureCall := Designator
( ":=" Expression
|
ActualParameters | % (* epsilon *) %
)
=:
-- these two break LL1 as both start with a Designator
-- ProcedureCall := Designator [ ActualParameters ] =:
-- Assignment := Designator ":=" Expression =:
StatementSequence := Statement { ";" Statement }
=:
IfStatement := "IF"
Expression "THEN"
StatementSequence
{ "ELSIF"
Expression "THEN"
StatementSequence
}
[ "ELSE"
StatementSequence ] "END"
=:
CaseStatement := "CASE"
Expression
"OF" Case { "|" Case }
CaseEndStatement
=:
CaseEndStatement := "END"
| "ELSE"
StatementSequence "END"
=:
Case := [ CaseLabelList ":" StatementSequence ]
=:
CaseLabelList := CaseLabels { "," CaseLabels } =:
CaseLabels := ConstExpression [ ".." ConstExpression ]
=:
WhileStatement := "WHILE" Expression "DO"
StatementSequence
"END"
=:
RepeatStatement := "REPEAT"
StatementSequence
"UNTIL" Expression
=:
ForStatement :=
"FOR" Ident ":=" Expression "TO" Expression [ "BY" ConstExpression ] "DO"
StatementSequence
"END"
=:
LoopStatement := "LOOP"
StatementSequence
"END"
=:
WithStatement := "WITH" Designator "DO"
StatementSequence
"END"
=:
ProcedureDeclaration := ProcedureHeading ";" ProcedureBlock
Ident % leaveScope %
=:
ProcedureIdent := Ident % curproc := lookupSym (curident) %
% enterScope (curproc) %
=:
DefProcedureIdent := Ident % curproc := lookupSym (curident) %
=:
DefineBuiltinProcedure := [ "__ATTRIBUTE__" "__BUILTIN__" "(" "(" Ident ")" ")" | "__INLINE__" ]
=:
ProcedureHeading := "PROCEDURE" DefineBuiltinProcedure ( ProcedureIdent
[ FormalParameters ]
AttributeNoReturn )
=:
Builtin := [ "__BUILTIN__" | "__INLINE__" ] =:
DefProcedureHeading := "PROCEDURE" Builtin ( DefProcedureIdent
[ DefFormalParameters ]
AttributeNoReturn )
=:
-- introduced procedure block so we can produce more informative
-- error messages
ProcedureBlock := { Declaration } [ "BEGIN" ProcedureBlockBody ] "END"
=:
Block := { Declaration } InitialBlock FinalBlock "END"
=:
InitialBlock := [ "BEGIN" InitialBlockBody ] =:
FinalBlock := [ "FINALLY" FinalBlockBody ] =:
InitialBlockBody := NormalPart [ "EXCEPT" ExceptionalPart ] =:
FinalBlockBody := NormalPart [ "EXCEPT" ExceptionalPart ] =:
ProcedureBlockBody := NormalPart [ "EXCEPT" ExceptionalPart ] =:
NormalPart := StatementSequence =:
ExceptionalPart := StatementSequence
=:
Declaration := "CONST" { ConstantDeclaration ";" } |
"TYPE" { TypeDeclaration } |
"VAR" { VariableDeclaration ";" } |
ProcedureDeclaration ";" |
ModuleDeclaration ";" =:
DefFormalParameters := "(" % paramEnter (curproc) %
[ DefMultiFPSection ] ")" % paramLeave (curproc) %
FormalReturn =:
DefMultiFPSection := DefExtendedFP | FPSection [ ";" DefMultiFPSection ] =:
FormalParameters := "(" % paramEnter (curproc) %
[ MultiFPSection ] ")" % paramLeave (curproc) %
FormalReturn =:
AttributeNoReturn := [ "<*" Ident "*>" ] =:
AttributeUnused := [ "<*" Ident "*>" ] =:
MultiFPSection := ExtendedFP | FPSection [ ";" MultiFPSection ] =:
FPSection := NonVarFPSection | VarFPSection =:
DefExtendedFP := DefOptArg | "..." =:
ExtendedFP := OptArg | "..." =:
VarFPSection := "VAR" PushIdentList ":" FormalType [ AttributeUnused ] =:
NonVarFPSection := PushIdentList ":" FormalType [ AttributeUnused ] =:
OptArg := "[" Ident ":" FormalType [ "=" ConstExpression ] "]" =:
DefOptArg := "[" Ident ":" FormalType "=" ConstExpression "]" =:
FormalType := { "ARRAY" "OF" } PushQualident =:
ModuleDeclaration := "MODULE" Ident [ Priority ] ";"
{ Import } [ Export ]
Block Ident
=:
Priority := "[" ConstExpression "]" =:
Export := "EXPORT" ( "QUALIFIED"
IdentList |
"UNQUALIFIED"
IdentList |
IdentList ) ";" =:
FromIdentList := Ident { "," Ident } =:
FromImport := "FROM" Ident "IMPORT" FromIdentList ";"
=:
ImportModuleList := Ident { "," Ident } =:
WithoutFromImport := "IMPORT" ImportModuleList ";"
=:
Import := FromImport | WithoutFromImport =:
DefinitionModule := "DEFINITION" "MODULE" [ "FOR" string ] Ident % curmodule := lookupDef (curident) %
% addCommentBody (curmodule) %
";"
% enterScope (curmodule) %
% resetConstExpPos (curmodule) %
{ Import } [ Export ]
{ Definition }
"END" Ident "." % checkEndName (curmodule, curident, 'definition module') %
% leaveScope %
=:
PushQualident := Ident % typeExp := push (lookupSym (curident)) %
% IF typeExp = NIL
THEN
metaError1 ('the symbol {%1k} is not visible in this scope (or any other nested scope)', curident)
END %
[ "."
% IF NOT isDef (typeExp)
THEN
ErrorArray ('the first component of this qualident must be a definition module')
END %
Ident % typeExp := replace (lookupInScope (typeExp, curident)) ;
IF typeExp=NIL
THEN
ErrorArray ('identifier not found in definition module')
END %
]
=:
OptSubrange := [ SubrangeType ] =:
TypeEquiv := PushQualident OptSubrange =:
EnumIdentList := Ident { "," Ident } =:
Enumeration := "(" EnumIdentList ")" =:
SimpleType := TypeEquiv | Enumeration | SubrangeType =:
Type := SimpleType | ArrayType | RecordType | SetType |
PointerType | ProcedureType
=:
TypeDeclaration := { Ident ( ";" | "=" Type Alignment ";" ) } =:
DefQualident :=
Ident % typeExp := lookupSym (curident) %
[ "." % IF NOT isDef (typeExp)
THEN
ErrorArray ('the first component of this qualident must be a definition module')
END %
Ident % typeExp := lookupInScope (typeExp, curident) ;
IF typeExp=NIL
THEN
ErrorArray ('identifier not found in definition module')
END %
]
=:
DefTypeEquiv := DefQualident OptSubrange =:
DefEnumIdentList := Ident { "," Ident } =:
DefEnumeration := "(" DefEnumIdentList ")" =:
DefSimpleType := DefTypeEquiv | DefEnumeration | SubrangeType
=:
DefType := DefSimpleType | ArrayType | RecordType | SetType |
PointerType | ProcedureType
=:
DefTypeDeclaration := { Ident ( ";" | "=" DefType Alignment ";" ) } =:
DefConstantDeclaration := Ident "=" ConstExpression =:
Definition := "CONST" { DefConstantDeclaration ";" } |
"TYPE" { DefTypeDeclaration } |
"VAR" { VariableDeclaration ";" } |
DefProcedureHeading ";" =:
AsmStatement := 'ASM' [ 'VOLATILE' ] '(' AsmOperands ')' =:
AsmOperands := string [ AsmOperandSpec ]
=:
AsmOperandSpec := [ ':' AsmList [ ':' AsmList [ ':' TrashList ] ] ]
=:
AsmList := [ AsmElement ] { ',' AsmElement } =:
NamedOperand := '[' Ident ']' =:
AsmOperandName := [ NamedOperand ]
=:
AsmElement := AsmOperandName string '(' Expression ')'
=:
TrashList := [ string ] { ',' string } =:
FNB