-- -- m2-2.bnf grammar and associated actions for pass 2. -- -- Copyright (C) 2001-2023 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 P2Build begin (* output from m2-2.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 . 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 P2Build ; FROM M2LexBuf IMPORT currentstring, currenttoken, GetToken, InsertToken, InsertTokenAndRewind, GetTokenNo ; FROM M2MetaError IMPORT MetaErrorStringT0, MetaErrorT1 ; FROM NameKey IMPORT NulName, Name, makekey, MakeKey ; FROM M2Reserved IMPORT tokToTok, toktype, NulTok, ImportTok, ExportTok, QualifiedTok, UnQualifiedTok ; FROM DynamicStrings IMPORT String, InitString, KillString, Mark, ConCat, ConCatChar ; FROM M2Printf IMPORT printf0 ; FROM M2Debug IMPORT Assert ; FROM M2Quads IMPORT PushT, PopT, PushTF, PopTF, PopNothing, OperandT, PushTFA, Top, Annotate, PushTFtok, PopTFtok, PushTFAtok, PopTtok, PushTtok, StartBuildInit, EndBuildInit, BuildProcedureStart, BuildProcedureEnd, BuildAssignment, BuildInline, AddRecordToList, AddVarientToList, IsAutoPushOn, PushAutoOff, PushAutoOn, PopAuto, DisplayStack ; FROM P2SymBuild IMPORT P2StartBuildProgramModule, P2EndBuildProgramModule, P2StartBuildDefModule, P2EndBuildDefModule, P2StartBuildImplementationModule, P2EndBuildImplementationModule, StartBuildInnerModule, EndBuildInnerModule, BuildImportOuterModule, BuildImportInnerModule, BuildExportOuterModule, BuildExportInnerModule, BlockStart, BlockEnd, BlockBegin, BlockFinally, BuildString, BuildNumber, BuildConst, BuildVariable, BuildTypeEnd, BuildNulName, BuildType, StartBuildEnumeration, StartBuildFormalParameters, EndBuildFormalParameters, BuildFPSection, BuildVarArgs, BuildOptArg, BuildFormalVarArgs, BuildProcedureHeading, StartBuildProcedure, EndBuildProcedure, BuildFunction, BuildOptFunction, BuildNoReturnAttribute, BuildPointerType, BuildRecord, BuildFieldRecord, StartBuildVarient, EndBuildVarient, BuildVarientSelector, StartBuildVarientFieldRecord, EndBuildVarientFieldRecord, BuildNulName, StartBuildArray, EndBuildArray, BuildFieldArray, BuildArrayComma, BuildSubrange, BuildAligned, BuildTypeAlignment, BuildVarAlignment, P2BuildDefaultFieldAlignment, BuildPragmaConst, BuildSetType, BuildFormalType, BuildFunction, BuildProcedureType, DetermineType, PushType, PopType, SeenUnknown, SeenSet, SeenString, SeenArray, SeenConstructor, SeenCast, PushRememberConstant, PopRememberConstant ; FROM M2Reserved IMPORT ArrayTok, VarTok ; FROM SymbolTable IMPORT MakeGnuAsm, PutGnuAsmVolatile, PutGnuAsm, PutGnuAsmInput, PutGnuAsmOutput, PutGnuAsmTrash, PutGnuAsmVolatile, MakeRegInterface, PutRegInterface, GetRegInterface, GetSymName, GetType, MakeConstLit, NulSym, StartScope, EndScope, PutIncluded, PutExceptionFinally, PutExceptionBlock, GetCurrentScope, IsVarParam, IsProcedure, IsDefImp, IsModule, IsRecord, IsAModula2Type, RequestSym ; IMPORT M2Error ; CONST Debugging = FALSE ; Pass1 = FALSE ; (* permanently disabled for the time being *) Pass2 = TRUE ; Pass3 = FALSE ; (* permanently disabled for the time being *) VAR WasNoError: BOOLEAN ; PROCEDURE ErrorString (s: String) ; BEGIN MetaErrorStringT0 (GetTokenNo (), s) ; WasNoError := FALSE END ErrorString ; PROCEDURE ErrorArray (a: ARRAY OF CHAR) ; BEGIN ErrorString (InitString (a)) END ErrorArray ; % declaration P2Build begin (* checkReturnAttribute - *) PROCEDURE checkReturnAttribute ; VAR ident: Name ; tok : CARDINAL ; BEGIN PopTtok (ident, tok) ; IF ident # MakeKey ('noreturn') THEN MetaErrorT1 (tok, 'attribute {%1k} is not allowed in the procedure return type, only noreturn is allowed', ident) END END checkReturnAttribute ; (* checkParameterAttribute - *) PROCEDURE checkParameterAttribute ; VAR ident: Name ; tok : CARDINAL ; BEGIN PopTtok (ident, tok) ; IF ident # MakeKey ('unused') THEN MetaErrorT1 (tok, 'attribute {%1k} is not allowed in the parameter formal type section, only unused is allowed', ident) END END checkParameterAttribute ; (* 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 ; (* --fixme-- this assumes a 32 bit word size. *) 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 (* --fixme-- this assumes a 32 bit word size. *) 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 INCL (s0, t) ELSIF ORD (t) <64 THEN INCL (s1, t) ELSE INCL (s2, t) END ; str := DescribeStop (s0, s1, s2) ; str := ConCat (InitString ('syntax error,'), Mark (str)) ; MetaErrorStringT0 (GetTokenNo (), str) 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 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 WasNoError := TRUE ; FileUnit(SetOfStop0{eoftok}, SetOfStop1{}, SetOfStop2{}) ; RETURN( WasNoError ) END CompilationUnit ; (* Ident - error checking varient of Ident *) PROCEDURE Ident (stopset0: SetOfStop0; stopset1: SetOfStop1; stopset2: SetOfStop2) ; BEGIN IF IsAutoPushOn() THEN PushTFtok(makekey(currentstring), identtok, GetTokenNo()) ; Annotate("%1n|identtok||Ident rule") END ; Expect(identtok, stopset0, stopset1, stopset2) END Ident ; (* 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 P2Build end END P2Build. % 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 handbuilt 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 := % PushAutoOn % ( DefinitionModule | ImplementationOrProgramModule ) % PopAuto % =: ProgramModule := "MODULE" % M2Error.DefaultProgramModule % % BlockStart (GetTokenNo () -1) % Ident % P2StartBuildProgramModule ; % [ Priority ] ";" { Import % BuildImportOuterModule ; % } Block % BlockEnd (GetTokenNo () -1) % Ident % P2EndBuildProgramModule ; % "." =: ImplementationModule := "IMPLEMENTATION" % M2Error.DefaultImplementationModule % % BlockStart (GetTokenNo () -1) % "MODULE" Ident % P2StartBuildImplementationModule ; % [ Priority ] ";" { Import % BuildImportOuterModule % } Block % BlockEnd (GetTokenNo () -1) % Ident % P2EndBuildImplementationModule ; % "." =: ImplementationOrProgramModule := ImplementationModule | ProgramModule =: Number := Integer | Real =: Qualident := % VAR name: Name ; Type, Sym, tok: CARDINAL ; % Ident % IF IsAutoPushOn() THEN PopTtok(name, tok) ; Sym := RequestSym (tok, name) ; IF IsDefImp(Sym) OR IsModule(Sym) THEN Expect(periodtok, stopset0, stopset1, stopset2 + SetOfStop2{identtok}) ; StartScope(Sym) ; Qualident(stopset0, stopset1, stopset2) ; (* should we test for lack of ident? *) PopTFtok(Sym, Type, tok) ; PushTFtok(Sym, Type, tok) ; Annotate("%1s(%1d)|%1s(%1d)||qualident|type") ; EndScope ; PutIncluded(Sym) ELSE PushTFtok(Sym, GetType(Sym), tok) ; Annotate("%1s(%1d)|%1s(%1d)||qualident|type") END ELSE (* just parse qualident *) % { "." Ident } % END % =: ConstantDeclaration := Ident "=" % SeenUnknown ; BuildConst % ConstExpressionInitial % DetermineType ; PopNothing % =: ConstExpressionInitial := % PushAutoOff % SimpleConstExpr [ Relation SimpleConstExpr ] % PopAuto % =: ConstExpression := % PushType ; SeenUnknown ; PushAutoOff % SimpleConstExpr [ Relation SimpleConstExpr ] % PopAuto ; PopType % =: Relation := % SeenUnknown (* actually it will be a BOOLEAN, but this is not a constructor and not a string *) % "=" | "#" | "<>" | "<" | "<=" | ">" | ">=" | "IN" =: SimpleConstExpr := UnaryOrConstTerm { AddOperator ConstTerm } =: UnaryOrConstTerm := "+" ConstTerm | "-" ConstTerm | ConstTerm =: AddOperator := "+" | "-" | "OR" % SeenUnknown (* actually it will be a BOOLEAN, but this is not a constructor and not a string *) % =: ConstTerm := ConstFactor { MulOperator ConstFactor } =: MulOperator := "*" | "/" | "DIV" % SeenUnknown % | "MOD" % SeenUnknown % | "REM" % SeenUnknown % | "AND" % SeenUnknown % | "&" % SeenUnknown % =: ConstFactor := Number | ConstString | ConstSetOrQualidentOrFunction | "(" ConstExpression ")" | "NOT" ConstFactor | ConstAttribute =: -- to help satisfy LL1 ConstString := string % SeenString % =: ComponentElement := ConstExpression [ ".." % PopType ; SeenSet ; PushType ; SeenUnknown % ConstExpression ] =: ComponentValue := % PushType ; SeenUnknown ; PushRememberConstant % ComponentElement [ 'BY' % PopType ; SeenArray ; PushType ; SeenUnknown % ConstExpression ] % PopType (* double check position, it must balance PushType *) % % PopRememberConstant % =: ArraySetRecordValue := ComponentValue { ',' ComponentValue } =: Constructor := '{' % SeenConstructor % [ ArraySetRecordValue ] '}' =: ConstSetOrQualidentOrFunction := Constructor | Qualident [ Constructor | ConstActualParameters ] =: ConstActualParameters := % PushType ; SeenUnknown % "(" [ ExpList ] ")" % PopType % =: -- to help satisfy LL1 ConstAttribute := "__ATTRIBUTE__" "__BUILTIN__" "(" "(" ConstAttributeExpression ")" ")" =: ConstAttributeExpression := Ident | "<" Qualident ',' Ident ">" =: ByteAlignment := '<*' % PushAutoOn % AttributeExpression % BuildAligned % % PopAuto % '*>' =: -- OptAlignmentExpression := [ AlignmentExpression ] =: -- AlignmentExpression := "(" ConstExpression ")" =: Alignment := ByteAlignment | % PushT(NulSym) % =: TypeDeclaration := % VAR top: CARDINAL ; % % top := Top() % Ident "=" Type Alignment % BuildTypeAlignment % % Assert(top=Top()) % =: Type := % PushAutoOn ; % ( SimpleType | ArrayType % BuildType ; % | RecordType % BuildType ; % | SetType % BuildType ; % | PointerType % BuildType ; % | ProcedureType % BuildType ; % ) % PopAuto ; % =: SimpleType := ( Qualident [ PrefixedSubrangeType ] % BuildType ; % | Enumeration % BuildType ; % | SubrangeType % BuildType ; % ) =: Enumeration := "(" ( IdentList ) ")" % StartBuildEnumeration ; % =: 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 % =: SubrangeType := "[" ConstExpression ".." ConstExpression "]" % BuildSubrange(NulSym) % =: PrefixedSubrangeType := "[" ConstExpression ".." ConstExpression "]" % VAR t: CARDINAL ; % % PopT(t) ; BuildSubrange(t) % =: ArrayType := "ARRAY" % VAR arrayType, tok: CARDINAL ; % % StartBuildArray ; PopTtok(arrayType, tok) ; PushTtok(arrayType, tok) ; BuildNulName ; % SimpleType % BuildFieldArray ; % { "," % BuildArrayComma ; BuildNulName ; % SimpleType % BuildFieldArray ; % } "OF" % BuildNulName ; % Type % EndBuildArray ; PopNothing ; PushTtok(arrayType, tok) % =: RecordType := "RECORD" % BuildRecord % [ DefaultRecordAttributes ] FieldListSequence "END" =: DefaultRecordAttributes := '<*' % PushAutoOn % AttributeExpression % P2BuildDefaultFieldAlignment % % PopAuto % '*>' =: RecordFieldPragma := ( '<*' FieldPragmaExpression % VAR n: CARDINAL ; % % n := 1 % % PushT(n) % % Annotate('(%1d)||pragma count') % { ',' % PopT(n) % FieldPragmaExpression % INC(n) % % PushT(n) % % Annotate('(%1d)||pragma count') % } '*>' | % n := 0 % % PushT(n) % % Annotate('(%1d)||pragma count') % ) =: FieldPragmaExpression := % PushAutoOn % Ident PragmaConstExpression % PopAuto % =: PragmaConstExpression := ( % PushAutoOff % '(' ConstExpression % BuildPragmaConst % ')' % PopAuto % | % PushT(NulSym) % % Annotate('NulSym||no pragma const') % ) =: AttributeExpression := Ident '(' ConstExpression ')' =: 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 FieldList := IdentList ":" % BuildNulName % Type RecordFieldPragma % BuildFieldRecord % | "CASE" % AddRecordToList % % StartBuildVarient % % AddVarientToList % CaseTag "OF" Varient { "|" Varient } [ "ELSE" % StartBuildVarientFieldRecord % FieldListSequence % EndBuildVarientFieldRecord % ] "END" % EndBuildVarient % =: TagIdent := Ident | % BuildNulName % =: CaseTag := TagIdent ( ":" Qualident | % PushT(NulSym) % ) % BuildVarientSelector % =: Varient := [ % StartBuildVarientFieldRecord % VarientCaseLabelList ":" FieldListSequence % EndBuildVarientFieldRecord % ] =: VarientCaseLabelList := VarientCaseLabels { "," VarientCaseLabels } =: VarientCaseLabels := ConstExpression [ ".." ConstExpression ] =: CaseLabelList := CaseLabels { "," CaseLabels } =: CaseLabels := ConstExpression [ ".." ConstExpression ] =: SetType := % VAR ispacked: BOOLEAN ; % % ispacked := FALSE % ( "SET" % ispacked := FALSE % | "PACKEDSET" % ispacked := TRUE % ) "OF" % BuildNulName % SimpleType % BuildSetType (ispacked) % =: PointerType := "POINTER" "TO" % BuildNulName % Type % BuildPointerType % =: ProcedureType := "PROCEDURE" % BuildProcedureType ; % [ FormalTypeList ] =: FormalTypeList := "(" ( ")" FormalReturn | ProcedureParameters ")" FormalReturn ) =: FormalReturn := [ ":" OptReturnType ] =: OptReturnType := "[" Qualident % BuildOptFunction % "]" | Qualident % BuildFunction % =: ProcedureParameters := ProcedureParameter { "," ProcedureParameter } =: ProcedureParameter := "..." % BuildFormalVarArgs % | "VAR" % PushT(VarTok) ; % FormalType % BuildFormalType ; % | % PushT(NulTok) ; % FormalType % BuildFormalType ; % =: VarIdent := Ident % VAR on : BOOLEAN ; Sym, Type, tok: CARDINAL ; % [ "[" % on := IsAutoPushOn() ; IF on THEN PopTFtok(Sym, Type, tok) ; PushTFAtok(Sym, Type, Sym, tok) END % ConstExpression "]" ] =: 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 % =: VariableDeclaration := VarIdentList ":" % BuildNulName % % DisplayStack % Type % DisplayStack % Alignment % DisplayStack % % BuildVarAlignment % % DisplayStack % % BuildVariable % =: Designator := Qualident { SubDesignator } =: SubDesignator := "." Ident | "[" ExpList "]" | "^" =: ExpList := Expression { "," Expression } =: Expression := % PushType ; SeenUnknown ; PushAutoOff % SimpleExpression [ Relation SimpleExpression ] % PopAuto ; PopType % =: SimpleExpression := UnaryOrTerm { AddOperator Term } =: UnaryOrTerm := "+" Term | "-" Term | 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 := % PushAutoOff ; % [ AssignmentOrProcedureCall | IfStatement | CaseStatement | WhileStatement | RepeatStatement | LoopStatement | ForStatement | WithStatement | AsmStatement | "EXIT" | "RETURN" [ Expression ] | RetryStatement ] % PopAuto ; % =: 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 % Assert(IsProcedure(OperandT(1))) % ";" ( ProcedureBlock % Assert(IsProcedure(OperandT(1))) % Ident ) % EndBuildProcedure % =: DefineBuiltinProcedure := [ "__ATTRIBUTE__" "__BUILTIN__" "(" "(" % PushAutoOff % Ident % PopAuto % ")" ")" | "__INLINE__" ] =: ProcedureHeading := "PROCEDURE" % M2Error.DefaultProcedure % DefineBuiltinProcedure ( Ident % StartBuildProcedure % % Assert(IsProcedure(OperandT(1))) % % StartBuildFormalParameters % [ FormalParameters ] % EndBuildFormalParameters % AttributeNoReturn % BuildProcedureHeading % ) =: Builtin := [ "__BUILTIN__" | "__INLINE__" ] =: DefProcedureHeading := "PROCEDURE" % M2Error.DefaultProcedure % Builtin ( Ident % StartBuildProcedure % % Assert(IsProcedure(OperandT(1))) % % StartBuildFormalParameters % [ DefFormalParameters ] % EndBuildFormalParameters % AttributeNoReturn % BuildProcedureHeading % ) % M2Error.LeaveErrorScope % =: AttributeNoReturn := [ "<*" % PushAutoOn % Ident % PopAuto % % checkReturnAttribute % % Assert(IsProcedure(OperandT(1))) % % BuildNoReturnAttribute (OperandT(1)) % "*>" ] =: AttributeUnused := [ "<*" % PushAutoOn % Ident % PopAuto % % checkParameterAttribute % "*>" ] =: -- introduced procedure block so we can produce more informative -- error messages ProcedureBlock := % Assert(IsProcedure(OperandT(1))) % { % Assert(IsProcedure(OperandT(1))) % Declaration % Assert(IsProcedure(OperandT(1))) % } [ "BEGIN" ProcedureBlockBody ] "END" % Assert(IsProcedure(OperandT(1))) % =: Block := { Declaration } InitialBlock FinalBlock "END" =: InitialBlock := [ "BEGIN" % BlockBegin (GetTokenNo () -1) % InitialBlockBody ] =: FinalBlock := [ "FINALLY" % BlockFinally (GetTokenNo () -1) % FinalBlockBody ] =: InitialBlockBody := NormalPart [ "EXCEPT" % PutExceptionBlock(GetCurrentScope()) % ExceptionalPart ] =: FinalBlockBody := NormalPart [ "EXCEPT" % PutExceptionFinally(GetCurrentScope()) % ExceptionalPart ] =: ProcedureBlockBody := NormalPart [ "EXCEPT" % PutExceptionBlock(GetCurrentScope()) % ExceptionalPart ] =: NormalPart := StatementSequence =: ExceptionalPart := StatementSequence =: Declaration := "CONST" { ConstantDeclaration ";" } | "TYPE" { TypeDeclaration ";" } | "VAR" { VariableDeclaration ";" } | ProcedureDeclaration ";" | ModuleDeclaration ";" =: DefFormalParameters := "(" [ DefMultiFPSection ] % VAR n: CARDINAL; % % PopT(n) ; (* remove param count *) % ")" FormalReturn % PushT(n) ; (* restore param count *) % =: DefMultiFPSection := DefExtendedFP | FPSection [ ";" DefMultiFPSection ] =: FormalParameters := "(" [ MultiFPSection ] % VAR n: CARDINAL; % % PopT(n) ; (* remove param count *) % ")" FormalReturn % PushT(n) ; (* restore param count *) % =: MultiFPSection := ExtendedFP | FPSection [ ";" MultiFPSection ] =: FPSection := NonVarFPSection | VarFPSection =: DefExtendedFP := DefOptArg | "..." % BuildVarArgs % =: ExtendedFP := OptArg | "..." % BuildVarArgs % =: OptArg := "[" % VAR n: CARDINAL ; % % PopT(n) % % PushT(NulTok) % Ident % PushT(1) % ":" FormalType % PushT(n) % % BuildFPSection % % BuildOptArg % [ "=" ConstExpression ] "]" =: DefOptArg := "[" % VAR n: CARDINAL ; % % PopT(n) % % PushT(NulTok) % Ident % PushT(1) % ":" FormalType % PushT(n) % % BuildFPSection % % BuildOptArg % "=" ConstExpression "]" =: VarFPSection := "VAR" % VAR n: CARDINAL ; % % PopT(n) ; % % PushT(VarTok) ; % IdentList ":" FormalType % PushT(n) % [ AttributeUnused ] % BuildFPSection % =: NonVarFPSection := % VAR n: CARDINAL ; % % PopT(n) % % PushT(NulTok) % IdentList ":" FormalType % PushT(n) % [ AttributeUnused ] % BuildFPSection % =: FormalType := "ARRAY" "OF" % VAR n: CARDINAL ; % % PushTF(ArrayTok, 1) % { "ARRAY" "OF" % PopTF(ArrayTok, n) % % INC(n) % % PushTF(ArrayTok, n) % } Qualident | % VAR Sym, Type: CARDINAL ; % Qualident % PopTF(Sym, Type) ; PushT(NulTok) ; PushTF(Sym, Type) % =: ModuleDeclaration := "MODULE" % M2Error.DefaultInnerModule % % BlockStart (GetTokenNo () -1) % Ident % StartBuildInnerModule % [ Priority ] ";" { Import % BuildImportInnerModule % } [ Export % BuildExportInnerModule % ] Block % BlockEnd (GetTokenNo () -1) % Ident % EndBuildInnerModule % =: Priority := "[" ConstExpression "]" =: Export := "EXPORT" ( "QUALIFIED" % PushT(QualifiedTok) % IdentList | "UNQUALIFIED" % PushT(UnQualifiedTok) % IdentList | % PushT(ExportTok) % IdentList ) ";" =: Import := "FROM" Ident "IMPORT" IdentList ";" | "IMPORT" % PushT(ImportTok) (* determines whether Ident or Module *) % IdentList ";" =: DefinitionModule := "DEFINITION" % M2Error.DefaultDefinitionModule % "MODULE" [ "FOR" string ] Ident % P2StartBuildDefModule % ";" { Import % BuildImportOuterModule % } [ Export % BuildExportOuterModule % ] { Definition } "END" Ident % P2EndBuildDefModule % "." =: Definition := "CONST" { ConstantDeclaration ";" } | "TYPE" { Ident ( ";" | "=" Type Alignment % BuildVarAlignment % ";" ) % BuildTypeEnd % } | "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