--
-- m2-1.bnf grammar and associated actions for pass 1.
--
-- Copyright (C) 2001-2023 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 P1Build begin
(* output from m2-1.bnf, automatically generated do not edit if these
are the top two lines in the file.
Copyright (C) 2001-2023 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 P1Build ;
FROM M2LexBuf IMPORT currentstring, currenttoken, GetToken, InsertToken, InsertTokenAndRewind, GetTokenNo ;
FROM M2Error IMPORT ErrorStringAt ;
FROM M2Quads IMPORT PushT, PushTF, PushTFtok, IsAutoPushOn, PushAutoOff, PushAutoOn, PopAuto, DisplayStack ;
FROM M2Reserved IMPORT tokToTok, toktype, NulTok, ImportTok, ExportTok, QualifiedTok, UnQualifiedTok, BuiltinTok, InlineTok ;
FROM NameKey IMPORT Name, NulName, makekey ;
FROM StrLib IMPORT StrCopy, StrConCat, StrEqual ;
FROM P2SymBuild IMPORT BuildString, BuildNumber ;
FROM DynamicStrings IMPORT String, InitString, KillString, Mark, ConCat, ConCatChar ;
FROM M2Debug IMPORT Assert ;
FROM M2Printf IMPORT printf0 ;
FROM SymbolTable IMPORT AddNameToScope ;
IMPORT M2Error ;
(* imports for Pass1 *)
FROM M2Quads IMPORT PushT, PopT,
StartBuildInit,
EndBuildInit,
BuildProcedureStart,
BuildProcedureEnd,
BuildAssignment,
BuildInline ;
FROM P1SymBuild IMPORT P1StartBuildProgramModule,
P1EndBuildProgramModule,
P1StartBuildDefinitionModule,
P1EndBuildDefinitionModule,
P1StartBuildImplementationModule,
P1EndBuildImplementationModule,
StartBuildInnerModule,
EndBuildInnerModule,
BuildImportOuterModule,
BuildImportInnerModule,
BuildExportOuterModule,
BuildExportInnerModule,
CheckExplicitExported,
BuildHiddenType,
BuildNulName,
StartBuildEnumeration, EndBuildEnumeration,
BuildProcedureHeading,
StartBuildProcedure,
EndBuildProcedure,
AddImportToImportStatement,
BuildImportStatement ;
FROM SymbolTable IMPORT MakeGnuAsm, PutGnuAsmVolatile, PutGnuAsm, PutGnuAsmInput,
PutGnuAsmOutput, PutGnuAsmTrash, PutGnuAsmVolatile,
MakeRegInterface,
PutRegInterface, GetRegInterface,
GetSymName,
NulSym ;
CONST
Debugging = FALSE ;
Pass0 = FALSE ;
Pass1 = TRUE ;
Pass2 = FALSE ; (* permanently disabled for the time being *)
Pass3 = FALSE ; (* permanently disabled for the time being *)
MaxInsert = 10 ; (* allow 10 tokens to be inserted before *)
(* giving up. *)
VAR
WasNoError : BOOLEAN ;
LastIdent : Name ;
InsertCount: CARDINAL ;
PROCEDURE ErrorString (s: String) ;
BEGIN
ErrorStringAt(s, GetTokenNo()) ;
WasNoError := FALSE
END ErrorString ;
PROCEDURE ErrorArray (a: ARRAY OF CHAR) ;
BEGIN
ErrorString(InitString(a))
END ErrorArray ;
% declaration P1Build 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) ;
INC(InsertCount) ;
IF (InsertCount<MaxInsert) AND
((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 ;
(*
WriteFormat2('token number %d token was %a',
GetTokenNo(), makekey(currentstring)) ;
FlushErrors ;
*)
IF Pass0
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
WasNoError := TRUE ;
InsertCount := 0 ;
FileUnit(SetOfStop0{eoftok}, SetOfStop1{}, SetOfStop2{}) ;
RETURN( WasNoError )
END CompilationUnit ;
(*
Ident - error checking varient of Ident
*)
PROCEDURE Ident (stopset0: SetOfStop0; stopset1: SetOfStop1; stopset2: SetOfStop2) ;
BEGIN
LastIdent := makekey(currentstring) ;
IF IsAutoPushOn()
THEN
PushTFtok(makekey(currentstring), identtok, GetTokenNo())
END ;
Expect(identtok, stopset0, stopset1, stopset2)
END Ident ;
(*
IdentScope - error checking varient of Ident but it remembers the
idents name in the current scope.
*)
PROCEDURE IdentScope (stopset0: SetOfStop0; stopset1: SetOfStop1; stopset2: SetOfStop2) ;
BEGIN
Ident(stopset0, stopset1, stopset2) ;
AddNameToScope(LastIdent)
END IdentScope ;
(*
PossiblyExportIdent - error checking varient of Ident which also
checks to see if this ident should be
explicitly exported.
*)
PROCEDURE PossiblyExportIdent (stopset0: SetOfStop0; stopset1: SetOfStop1; stopset2: SetOfStop2) ;
VAR
nothing: CARDINAL ;
BEGIN
AddNameToScope(makekey(currentstring)) ;
PushTF(makekey(currentstring), identtok) ;
CheckExplicitExported ;
IF NOT IsAutoPushOn()
THEN
PopT(nothing)
END ;
Expect(identtok, stopset0, stopset1, stopset2)
END PossiblyExportIdent ;
(*
string -
*)
PROCEDURE string (stopset0: SetOfStop0; stopset1: SetOfStop1; stopset2: SetOfStop2) ;
BEGIN
IF IsAutoPushOn()
THEN
PushTF(makekey(currentstring), stringtok) ;
BuildString
END ;
Expect(stringtok, stopset0, stopset1, stopset2)
END string ;
(*
Integer -
*)
PROCEDURE Integer (stopset0: SetOfStop0; stopset1: SetOfStop1; stopset2: SetOfStop2) ;
BEGIN
IF IsAutoPushOn()
THEN
PushTFtok (makekey(currentstring), integertok, GetTokenNo ()) ;
BuildNumber
END ;
Expect(integertok, stopset0, stopset1, stopset2)
END Integer ;
(*
Real -
*)
PROCEDURE Real (stopset0: SetOfStop0; stopset1: SetOfStop1; stopset2: SetOfStop2) ;
BEGIN
IF IsAutoPushOn()
THEN
PushTFtok (makekey(currentstring), realtok, GetTokenNo ()) ;
BuildNumber
END ;
Expect(realtok, stopset0, stopset1, stopset2)
END Real ;
% module P1Build end
END P1Build.
% 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 PossiblyExportIdent first { < identtok > } follow { }
'@i{is a builtin which automatically exports an identifier}'
special Ident first { < identtok > } follow { }
'@i{is a builtin and checks for an identifier}'
special IdentScope first { < identtok > } follow { }
'@i{a builtin which provides a context for error messages}'
special Integer first { < integertok > } follow { }
'@i{is a builtin and checks for an integer}'
special Real first { < realtok > } follow { }
'@i{is a builtin and checks for an real constant}'
special string first { < stringtok > } follow { }
'@i{is a builtin and checks for an string constant}'
BNF
-- the following are provided by the module m2flex and also hand built 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 := % PushAutoOff %
( DefinitionModule |
ImplementationOrProgramModule ) % PopAuto %
=:
ProgramModule := "MODULE" % M2Error.DefaultProgramModule %
% PushAutoOn ; %
Ident % P1StartBuildProgramModule ; %
% PushAutoOff ; %
[ Priority ]
";"
% PushAutoOn ; %
{ Import % BuildImportOuterModule(FALSE) %
} % PopAuto %
Block
% PushAutoOn %
Ident % P1EndBuildProgramModule %
"." % PopAuto ; PopAuto ; PopAuto %
=:
ImplementationModule := "IMPLEMENTATION" % M2Error.DefaultImplementationModule %
"MODULE" % PushAutoOn ; %
Ident % P1StartBuildImplementationModule ; %
% PushAutoOff ; %
[ Priority ] ";" % PushAutoOn ; %
{ Import % BuildImportOuterModule(FALSE) %
} % PopAuto ; %
Block % PushAutoOn ; %
Ident % P1EndBuildImplementationModule %
% PopAuto ; PopAuto ; PopAuto ; %
"." =:
ImplementationOrProgramModule := ImplementationModule | ProgramModule =:
Number := Integer | Real =:
Qualident := Ident { "." Ident } =:
ConstantDeclaration := PossiblyExportIdent
"=" ConstExpression =:
ConstExpression := % PushAutoOff %
SimpleConstExpr [ Relation SimpleConstExpr ] % PopAuto %
=:
Relation := "=" | "#" | "<>" | "<" | "<=" | ">" | ">=" | "IN" =:
SimpleConstExpr := UnaryOrConstTerm { AddOperator ConstTerm } =:
UnaryOrConstTerm := "+" ConstTerm | "-" ConstTerm | ConstTerm =:
AddOperator := "+" | "-" | "OR" =:
ConstTerm := ConstFactor { MulOperator ConstFactor } =:
MulOperator := "*" | "/" | "DIV" | "MOD" | "REM" | "AND" | "&" =:
ConstFactor := Number | ConstString | ConstSetOrQualidentOrFunction |
"(" ConstExpression ")" | "NOT" ConstFactor |
ConstAttribute =:
-- to help satisfy LL1
ConstString := string =:
ComponentElement := ConstExpression [ ".." ConstExpression ] =:
ComponentValue := ComponentElement [ 'BY' ConstExpression ] =:
ArraySetRecordValue := ComponentValue { ',' ComponentValue } =:
Constructor := '{' [ ArraySetRecordValue ] '}' =:
ConstSetOrQualidentOrFunction := Constructor | Qualident
[ Constructor | ConstActualParameters ] =:
ConstActualParameters := "(" [ ExpList ] ")" =:
ConstAttribute := "__ATTRIBUTE__" "__BUILTIN__" "(" "(" ConstAttributeExpression ")" ")" =:
ConstAttributeExpression := Ident | "<" Qualident ',' Ident ">" =:
ByteAlignment := '<*' AttributeExpression '*>' =:
-- OptAlignmentExpression := [ AlignmentExpression ] =:
-- AlignmentExpression := "(" ConstExpression ")" =:
Alignment := [ ByteAlignment ] =:
TypeDeclaration :=
% PushAutoOn %
( IdentScope "=" Type Alignment ) % PopAuto %
=:
Type := % VAR Name: CARDINAL ; %
% PushAutoOff %
( SimpleType | ArrayType | RecordType | SetType |
PointerType | ProcedureType ) % PopAuto %
% PopT(Name) (* remove TYPE name from stack *) %
=:
SimpleType := Qualident [ SubrangeType ] | Enumeration | SubrangeType =:
Enumeration := "(" % PushAutoOn %
( PossiblyExportIdentList % StartBuildEnumeration %
% EndBuildEnumeration %
) % PopAuto %
")" =:
IdentList := Ident % VAR
on: BOOLEAN ;
n : CARDINAL ; %
% on := IsAutoPushOn() ;
IF on
THEN
n := 1
END %
{ "," Ident % IF on
THEN
INC(n)
END %
} % IF on
THEN
PushT(n)
END %
=:
PossiblyExportIdentList := PossiblyExportIdent % VAR
on: BOOLEAN ;
n : CARDINAL ; %
% on := IsAutoPushOn() ;
IF on
THEN
n := 1
END %
{ "," PossiblyExportIdent % IF on
THEN
INC(n)
END %
} % IF on
THEN
PushT(n)
END %
=:
SubrangeType := "[" ConstExpression ".." ConstExpression "]" =:
ArrayType := "ARRAY" SimpleType { "," SimpleType } "OF" % BuildNulName %
Type =:
RecordType := "RECORD" [ DefaultRecordAttributes ] FieldListSequence "END" =:
DefaultRecordAttributes := '<*' AttributeExpression '*>' =:
RecordFieldPragma := [ '<*' FieldPragmaExpression
{ ',' FieldPragmaExpression } '*>' ] =:
FieldPragmaExpression := % PushAutoOff %
Ident [ '(' ConstExpression ')' ] % PopAuto %
=:
AttributeExpression := % PushAutoOff %
Ident '(' ConstExpression ')' % PopAuto %
=:
AttributeUnused := [ "<*" % PushAutoOff %
Ident % PopAuto %
"*>" ] =:
FieldListSequence := FieldListStatement { ";" FieldListStatement } =:
FieldListStatement := [ FieldList ] =:
-- sadly the PIM rules are not LL1 as Ident and Qualident have the same first
-- symbols. We rewrite FieldList to inline qualident
-- was
-- FieldList := IdentList ":" % BuildNulName %
-- Type |
-- "CASE" [ Ident ":" ] Qualident "OF" Varient { "|" Varient }
-- [ "ELSE" FieldListSequence ] "END" =:
FieldList := IdentList ":" % BuildNulName %
Type RecordFieldPragma
|
"CASE" CaseTag "OF" Varient { "|" Varient }
[ "ELSE" FieldListSequence ] "END"
=:
TagIdent := [ Ident ] =:
CaseTag := TagIdent [ ":" Qualident ] =:
Varient := [ VarientCaseLabelList ":" FieldListSequence ] =:
VarientCaseLabelList := VarientCaseLabels { "," VarientCaseLabels } =:
VarientCaseLabels := ConstExpression [ ".." ConstExpression ] =:
CaseLabelList := CaseLabels { "," CaseLabels } =:
CaseLabels := ConstExpression [ ".." ConstExpression ] =:
SetType := % VAR Name: CARDINAL ; %
( "SET" | "PACKEDSET" )
"OF" % BuildNulName ; %
SimpleType % PopT(Name) ; %
=:
PointerType := "POINTER" "TO" % BuildNulName %
Type =:
ProcedureType := "PROCEDURE" [ FormalTypeList ] =:
FormalTypeList := "(" ( ")" FormalReturn |
ProcedureParameters ")" FormalReturn ) =:
FormalReturn := [ ":" OptReturnType ] =:
OptReturnType := "[" Qualident "]" | Qualident =:
ProcedureParameters := ProcedureParameter
{ "," ProcedureParameter } =:
ProcedureParameter := "..." | "VAR" FormalType | FormalType =:
VarIdent := PossiblyExportIdent [ "[" ConstExpression "]" ]
=:
VariableDeclaration :=
( VarIdentList ":" % BuildNulName %
Type Alignment )
=:
VarIdentList := VarIdent % VAR
on: BOOLEAN ;
n : CARDINAL ; %
% on := IsAutoPushOn() ;
IF on
THEN
n := 1
END %
{ "," VarIdent % IF on
THEN
INC(n)
END %
} % IF on
THEN
PushT(n)
END %
=:
Designator := Qualident { SubDesignator } =:
SubDesignator := "." Ident | "[" ExpList "]" | "^" =:
ExpList := Expression { "," Expression } =:
Expression := % PushAutoOff %
SimpleExpression [ Relation SimpleExpression ] % PopAuto %
=:
SimpleExpression := [ "+" | "-" ] Term { AddOperator Term } =:
Term := Factor { MulOperator Factor } =:
Factor := Number | string | SetOrDesignatorOrFunction |
"(" Expression ")" | "NOT" Factor | ConstAttribute =:
SetOrDesignatorOrFunction := ( Qualident [ Constructor |
SimpleDes [ ActualParameters ]
] | Constructor
)
=:
SimpleDes := { "." Ident | "[" ExpList "]" | "^" } =:
ActualParameters := "(" [ ExpList ] ")" =:
Statement := [ AssignmentOrProcedureCall | IfStatement | CaseStatement |
WhileStatement | RepeatStatement | LoopStatement |
ForStatement | WithStatement | AsmStatement |
"EXIT" | "RETURN" [ Expression ] | 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 }
[ "ELSE" StatementSequence ] "END" =:
Case := [ CaseLabelList ":" StatementSequence ] =:
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 % PushAutoOn %
Ident ) % EndBuildProcedure %
% PopAuto %
=:
DefineBuiltinProcedure := "__ATTRIBUTE__" "__BUILTIN__" "(" "(" Ident ")" ")"
| "__INLINE__" % PushT(InlineTok) %
| % PushT(NulTok) %
=:
ProcedureHeading := "PROCEDURE" % M2Error.DefaultProcedure %
% PushAutoOn %
DefineBuiltinProcedure
( PossiblyExportIdent % StartBuildProcedure %
% PushAutoOff %
[ FormalParameters ] AttributeNoReturn
% PopAuto %
% BuildProcedureHeading %
) % PopAuto %
=:
Builtin := "__BUILTIN__" % PushT(BuiltinTok) %
| "__INLINE__" % PushT(InlineTok) %
| % PushT(NulTok) %
=:
DefProcedureHeading := "PROCEDURE" % M2Error.DefaultProcedure %
Builtin % PushAutoOn %
( PossiblyExportIdent % StartBuildProcedure %
% PushAutoOff %
[ DefFormalParameters ] AttributeNoReturn
% PopAuto %
% BuildProcedureHeading %
) % PopAuto %
% M2Error.LeaveErrorScope %
=:
AttributeNoReturn := [ "<*" Ident "*>" ] =:
-- introduced procedure block so we can produce more informative
-- error messages
ProcedureBlock := { Declaration } [ "BEGIN" BlockBody ] "END" =:
Block := { Declaration } InitialBlock FinalBlock "END" =:
InitialBlock := [ "BEGIN" BlockBody ] =:
FinalBlock := [ "FINALLY" BlockBody ] =:
BlockBody := NormalPart [ "EXCEPT" ExceptionalPart ] =:
NormalPart := StatementSequence =:
ExceptionalPart := StatementSequence =:
Declaration := "CONST" { ConstantDeclaration ";" } |
"TYPE" { TypeDeclaration ";" } |
"VAR" { VariableDeclaration ";" } |
ProcedureDeclaration ";" |
ModuleDeclaration ";" =:
DefFormalParameters := "(" [ DefMultiFPSection ] ")" FormalReturn =:
DefMultiFPSection := DefExtendedFP |
FPSection [ ";" DefMultiFPSection ] =:
FormalParameters := "(" [ MultiFPSection ] ")" FormalReturn =:
MultiFPSection := ExtendedFP |
FPSection [ ";" MultiFPSection ] =:
FPSection := NonVarFPSection | VarFPSection =:
DefExtendedFP := DefOptArg | "..." =:
ExtendedFP := OptArg | "..." =:
VarFPSection := "VAR" IdentList ":" FormalType [ AttributeUnused ] =:
NonVarFPSection := IdentList ":" FormalType [ AttributeUnused ] =:
OptArg := "[" IdentScope ":" FormalType [ "=" ConstExpression ] "]" =:
DefOptArg := "[" IdentScope ":" FormalType "=" ConstExpression "]" =:
FormalType := { "ARRAY" "OF" } Qualident =:
ModuleDeclaration := "MODULE" % M2Error.DefaultInnerModule %
% PushAutoOn %
Ident % StartBuildInnerModule %
% PushAutoOff %
[ Priority ] ";" % PushAutoOn %
{ Import % BuildImportInnerModule %
} [ Export % BuildExportInnerModule %
] % PopAuto %
Block % PushAutoOn %
Ident % EndBuildInnerModule %
% PopAuto ; PopAuto ; PopAuto %
=:
Priority := "[" ConstExpression "]" =:
Export := "EXPORT" ( "QUALIFIED" % PushT(QualifiedTok) %
IdentList |
"UNQUALIFIED" % PushT(UnQualifiedTok) %
IdentList | % PushT(ExportTok) %
IdentList ) ";" =:
Import := "FROM" % BuildImportStatement (GetTokenNo () -1) %
Ident % AddImportToImportStatement (TRUE) %
"IMPORT" IdentList ";" |
"IMPORT" % BuildImportStatement (GetTokenNo () -1) %
% PushT(ImportTok)
(* determines whether Ident or Module *) %
IdentImportList ";" =:
IdentImportList := Ident % VAR
on: BOOLEAN ;
n : CARDINAL ; %
% on := IsAutoPushOn() ;
IF on
THEN
AddImportToImportStatement (FALSE) ;
n := 1
END %
{ "," Ident % IF on
THEN
AddImportToImportStatement (FALSE) ;
INC(n)
END %
} % IF on
THEN
PushT(n)
END %
=:
DefinitionModule := "DEFINITION" % M2Error.DefaultDefinitionModule %
"MODULE" % PushAutoOn %
( "FOR" string | % (* epsilon *)
PushT(NulSym) %
)
Ident % P1StartBuildDefinitionModule %
";"
{ Import % BuildImportOuterModule(TRUE) %
} [ Export % BuildExportOuterModule %
] % PushAutoOff %
{ Definition } % PopAuto %
"END" Ident % P1EndBuildDefinitionModule %
"." % PopAuto %
=:
Definition := "CONST" { ConstantDeclaration ";" } |
"TYPE" % PushAutoOn %
{ PossiblyExportIdent
( ";" % BuildHiddenType %
| "=" Type Alignment ";" ) } % PopAuto %
|
"VAR" { VariableDeclaration ";" } |
DefProcedureHeading ";" =:
AsmStatement := 'ASM' [ 'VOLATILE' ] '(' AsmOperands ')' =:
NamedOperand := '[' Ident ']' =:
AsmOperandName := [ NamedOperand ] =:
AsmOperands := string [ ':' AsmList [ ':' AsmList [ ':' TrashList ] ] ]
=:
AsmList := [ AsmElement ] { ',' AsmElement } =:
AsmElement := AsmOperandName string '(' Expression ')'
=:
TrashList := [ string ] { ',' string } =:
FNB