-- -- m2-1.bnf grammar and associated actions for pass 1. -- -- Copyright (C) 2001-2024 Free Software Foundation, Inc. -- Contributed by Gaius Mulley . -- -- 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 -- . % 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) 2001-2024 Free Software Foundation, Inc. Contributed by Gaius Mulley . 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 . *) 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 ; 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=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=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 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)) ; PushTFtok(makekey(currentstring), identtok, GetTokenNo()) ; 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 := ConstExpression ':' AsmList [ ':' AsmList [ ':' TrashList ] ] =: AsmList := [ AsmElement ] { ',' AsmElement } =: AsmElement := AsmOperandName ConstExpression '(' Expression ')' =: TrashList := [ ConstExpression ] { ',' ConstExpression } =: FNB