modula2: Reimplement parameter declaration and checking.

This patch improves the parameter declaration by saving all parameter
kinds: proper procedure, definition module procedure and forward
procedures.  This allows error messages to reference any parameter
in the three kinds of procedures.  Variables and their declaration
are also stored.  The expression, assignment and parameter checking
has been improved to highlight any variable or parameter and
its declaration causing a conflict.

gcc/m2/ChangeLog:

	* gm2-compiler/M2Base.def (MixTypes): Rename parameters.
	(MixTypesDecl): New procedure function.
	* gm2-compiler/M2Base.mod (BuildOrdFunctions): Add
	DefProcedure parameter to PutFunction.
	(BuildTruncFunctions): Ditto.
	(BuildFloatFunctions): Ditto.
	(BuildIntFunctions): Ditto.
	(InitBaseFunctions): Ditto.
	(MixTypesDecl): New procedure function.
	(MixTypes): Reimplement.
	* gm2-compiler/M2Check.mod (checkProcType): Replace
	NoOfParam with NoOfParamAny.
	Replace IsVarParam with IsVarParamAny.
	(checkProcedureProcType): Ditto.
	* gm2-compiler/M2Error.def: Remove unnecessary export qualified list.
	* gm2-compiler/M2GCCDeclare.mod: Replace NoOfParam with NoOfParamAny.
	Replace IsVarParam with IsVarParamAny.
	(DeclareProcedureToGccWholeProgram): Rename son to
	Variable.
	(DeclareProcedureToGccSeparateProgram): Ditto.
	(PrintKind): New procedure.
	(PrintProcedureParameters): Ditto.
	(PrintProcedureReturnType): Ditto.
	(PrintProcedure): Reimplement.
	(PrintProcTypeParameters): New procedure.
	(PrintProcType): Ditto.
	(DeclareProcType): Rename Son to Parameter.
	* gm2-compiler/M2GenGCC.mod: Replace NoOfParam with NoOfParamAny.
	Replace IsVarParam with IsVarParamAny.
	(ErrorMessageDecl): New procedure.
	(checkIncorrectMeta): Replace call to MetaErrorT2 with
	ErrorMessageDecl.
	(ComparisonMixTypes): Add varleft and varright parameters.
	Adjust all callers of ComparisonMixTypes.
	* gm2-compiler/M2MetaError.def (MetaErrorDecl): New procedure.
	* gm2-compiler/M2MetaError.mod (MetaErrorDecl): New procedure.
	* gm2-compiler/M2Options.def (SetXCode): Add -fd flag description
	to comment.
	* gm2-compiler/M2Options.mod (SetXCode): Add -fd flag description
	to comment.
	* gm2-compiler/M2Quads.mod (CheckBreak): New procedure.
	Replace NoOfParam with NoOfParamAny.
	Replace IsVarParam with IsVarParamAny.
	(FailParameter): Reimplement using GetVarDeclFullTok.
	Generate message for formal parameter, actual parameter and
	declaration of actual parameter.
	(WarnParameter): Ditto.
	(CheckBuildFunction): Reimplement error message using MetaErrorT1.
	* gm2-compiler/M2Range.mod: Replace NoOfParam with NoOfParamAny.
	Replace IsVarParam with IsVarParamAny.
	* gm2-compiler/M2Scaffold.mod (DeclareScaffoldFunctions): Call
	PutProcedureDefined after every procedure declaration.
	(DeclareArgEnvParams): Add ProperProcedure parameter to PutParam.
	* gm2-compiler/M2Size.mod (MakeSize): Add DefProcedure parameter
	to PutFunction.
	* gm2-compiler/M2Swig.mod: Replace NoOfParam with NoOfParamAny.
	Replace IsVarParam with IsVarParamAny.
	* gm2-compiler/M2SymInit.mod: Ditto.
	* gm2-compiler/M2System.mod (InitSystem): Add DefProcedure
	parameter to PutFunction.
	* gm2-compiler/P1SymBuild.mod (StartBuildProcedure): Reimplement.
	(EndBuildProcedure): Ditto.
	(EndBuildForward): Ditto.
	* gm2-compiler/P2Build.bnf (BuildProcedureDefinedByForward):
	Remove.
	(BuildProcedureDefinedByProper): Ditto.
	(ForwardDeclaration): Remove BuildProcedureDefinedByForward.
	(BuildNoReturnAttribute): Remove parameter.
	* gm2-compiler/P2SymBuild.def (BuildNoReturnAttribute): Remove
	parameter.
	(BuildProcedureDefinedByForward): Remove.
	(BuildProcedureDefinedByProper): Ditto.
	* gm2-compiler/P2SymBuild.mod (Import): Remove
	AreParametersDefinedInDefinition,
	AreParametersDefinedInImplementation,
	AreProcedureParametersDefined,
	ParametersDefinedInDefinition,
	ParametersDefinedInImplementation,
	GetProcedureDeclaredDefinition,
	GetProcedureDeclaredForward,
	GetProcedureDeclaredProper,
	GetParametersDefinedByForward,
	GetParametersDefinedByProper and
	PutProcedureNoReturn.
	Add PutProcedureParametersDefined,
	GetProcedureParametersDefined,
	GetProcedureKindDesc,
	GetProcedureDeclaredTok,
	GetProcedureKind,
	GetReturnTypeTok,
	SetReturnOptional,
	IsReturnOptional,
	PutProcedureNoReturn and
	PutProcedureDefined.
	(Debug): New procedure.
	(P2StartBuildDefModule): Space formatting.
	(BuildVariable): Reimplement to record full declaration.
	(StartBuildProcedure): Reimplement using token to determine
	the kind of procedure.
	(BuildProcedureHeading): Ditto.
	(BuildFPSection): Ditto.
	(BuildVarArgs): Ditto.
	(BuildOptArg): Ditto.
	(BuildProcedureDefinedByForward): Remove.
	(BuildProcedureDefinedByProper): Ditto.
	(BuildFormalParameterSection): Reimplement so that the
	quad stack is unchanged.
	(CheckFormalParameterSection): Ditto.
	(RemoveFPParameters): New procedure.
	(ParameterError): Reimplement.
	(StartBuildFormalParameters): Add annotation.
	(ParameterMismatch): Reimplement.
	(EndBuildFormalParameters): Reimplement to check against
	all procedure kinds.
	(GetSourceDesc): Remove.
	(GetCurSrcDesc): Ditto.
	(GetDeclared): Ditto.
	(ReturnTypeMismatch): Reimplement.
	(BuildFunction): Ditto.
	(BuildOptFunction): Ditto.
	(CheckOptFunction): New procedure.
	(BuildNoReturnAttribute): Remove parameter and obtain
	procedure symbol from quad stack.
	(CheckProcedureReturn): New procedure.
	* gm2-compiler/P3SymBuild.mod (BuildOptArgInitializer):
	Preserve ProcSym tok on the quad stack.
	Add Assert.
	* gm2-compiler/PCSymBuild.mod (fixupProcedureType): Replace
	NoOfParam with NoOfParamAny.
	* gm2-compiler/SymbolTable.def (GetNthParam): Add ProcedureKind
	parameter.
	(PutFunction): Ditto.
	(PutOptFunction): Ditto.
	(IsReturnOptional): Ditto.
	(PutParam): Ditto.
	(PutVarParam): Ditto.
	(PutParamName): Ditto.
	(PutProcedureNoReturn): Ditto.
	(IsProcedureNoReturn): Ditto.
	(IsVarParam): Ditto.
	(IsUnboundedParam): Ditto.
	(NoOfParam): Ditto.
	(ForeachLocalSymDo): Ditto.
	(GetProcedureKind): Ditto.
	(GetProcedureDeclaredTok): Ditto.
	(PutProcedureDeclaredTok): Ditto.
	(GetReturnTypeTok): Ditto.
	(PutReturnTypeTok): Ditto.
	(PutParametersDefinedByForward): New procedure.
	(PutProcedureParametersDefined): Ditto.
	(PutProcedureDefined): Ditto.
	(GetParametersDefinedByProper): Ditto.
	(GetProcedureDeclaredForward): Ditto.
	(GetProcedureDeclaredProper): Ditto.
	(PutProcedureDeclaredProper): Ditto.
	(GetProcedureDeclaredDefinition): Ditto.
	(PutProcedureDeclaredDefinition): Ditto.
	(GetProcedureDefined): Ditto.
	(PutUseOptArg): Ditto.
	(UsesOptArg): Ditto.
	(PutOptArgInit): Ditto.
	(SetReturnOptional): Ditto.
	(UsesOptArgAny): Ditto.
	(GetProcedureKindDesc): Ditto.
	(IsReturnOptionalAny): New procedure function.
	(GetNthParamAny): Ditto.
	(NoOfParamAny): Ditto.
	(IsProcedureAnyNoReturn): Ditto.
	(AreParametersDefinedInImplementation): Remove.
	(ParametersDefinedInImplementation): Ditto.
	(AreParametersDefinedInDefinition): Ditto.
	(AreProcedureParametersDefined): Ditto.
	(ParametersDefinedInDefinition): Ditto.
	(ProcedureParametersDefined): Ditto.
	(PutParametersDefinedByProper): Ditto.
	(PutProcedureDeclaredForward): Ditto.
	(GetParametersDefinedByForward): Ditto.
	(GetProcedureParametersDefined): Ditto.
	(PushOffset): Ditto.
	(PopSize): Ditto.
	(PushParamSize): Ditto.
	(PushSumOfLocalVarSize): Ditto.
	(PushSumOfParamSize): Ditto.
	(PopOffset): Ditto.
	(PopSumOfParamSize): Ditto.
	* gm2-compiler/SymbolTable.mod (MakeProcedure): Reimplement.
	(PutProcedureNoReturn): Add ProcedureKind parameter.
	(GetNthParam): Ditto.
	(PutFunction): Ditto.
	(PutOptFunction): Ditto.
	(IsReturnOptional): Ditto.
	(MakeVariableForParam): Ditto.
	(PutParam): Ditto.
	(PutVarParam): Ditto.
	(PutParamName): Ditto.
	(AddParameter): Ditto.
	(IsVarParam): Ditto.
	(IsVarParamAny): Ditto.
	(NoOfParam): Ditto.
	(HasVarParameters): Ditto.
	(IsUnboundedParam): Ditto.
	(PutUseVarArgs): Ditto.
	(UsesVarArgs): Ditto.
	(PutUseOptArg): Ditto.
	(UsesOptArg): Ditto.
	(UsesOptArgAny): Ditto.
	(PutOptArgInit): Ditto.
	(IsProcedure): Ditto.
	(IsPointer): Ditto.
	(IsRecord): Ditto.
	(IsArray): Ditto.
	(IsEnumeration): Ditto.
	(IsUnbounded): Ditto.
	(IsSet): Ditto.
	(IsSetPacked): Ditto.
	(CheckUnbounded): Ditto.
	(IsOAFamily): Ditto.
	(IsModuleWithinProcedure): Ditto.
	(GetDeclaredDef): Ditto.
	(GetDeclaredMod): Ditto.
	(GetDeclaredFor): Ditto.
	(GetProcedureDeclaredForward): Ditto.
	(GetProcedureKind): Ditto.
	(PutProcedureDeclaredForward): Ditto.
	(GetProcedureDeclaredTok): Ditto.
	(GetProcedureDeclaredProper): Ditto.
	(PutProcedureDeclaredTok): Ditto.
	(PutProcedureDeclaredProper): Ditto.
	(GetReturnTypeTok): Ditto.
	(GetProcedureDeclaredDefinition): Ditto.
	(PutReturnTypeTok): Ditto.
	(PutProcedureDeclaredDefinition): Ditto.
	(GetProcedureKindDesc): Ditto.
	(IsProcedureVariable): Ditto.
	(IsAModula2Type): Ditto.
	(GetParam): Ditto.
	(ProcedureParametersDefined): Ditto.
	(AreParametersDefinedInImplementation): Remove.
	(AreParametersDefinedInDefinition): Ditto.
	(AreProcedureParametersDefined): Ditto.
	(IsSizeSolved): Ditto.
	(IsOffsetSolved): Ditto.
	(IsValueSolved): Ditto.
	(IsSumOfParamSizeSolved): Ditto.
	(PushSize): Ditto.
	(PushOffset): Ditto.
	(PopSize): Ditto.
	(PushValue): Ditto.
	(PushParamSize): Ditto.
	(PushSumOfLocalVarSize): Ditto.
	(PushSumOfParamSize): Ditto.
	(PushVarSize): Ditto.
	(PopValue): Ditto.
	(PopSize): Ditto.
	(PopOffset): Ditto.
	(PopSumOfParamSize): Ditto.
	(PutParametersDefinedByForward): New procedure.
	(PutProcedureParametersDefined): Ditto.
	(PutProcedureDefined): Ditto.
	(GetParametersDefinedByProper): Ditto.
	(GetProcedureDeclaredForward): Ditto.
	(GetProcedureDeclaredProper): Ditto.
	(PutProcedureDeclaredProper): Ditto.
	(GetProcedureDeclaredDefinition): Ditto.
	(PutProcedureDeclaredDefinition): Ditto.
	(GetProcedureDefined): Ditto.
	(PutUseOptArg): Ditto.
	(UsesOptArg): Ditto.
	(PutOptArgInit): Ditto.
	(SetReturnOptional): Ditto.
	(UsesOptArgAny): Ditto.
	(GetProcedureKindDesc): Ditto.
	(PutParametersDefinedByProper): Ditto.
	(GetParametersDefinedByProper): Ditto.
	(IsReturnOptionalAny): New procedure function.
	(IsProcedureAnyDefaultBoolean): Ditto.
	(IsProcedureAnyBoolean): Ditto.
	(IsProcedureAnyNoReturn): Ditto.
	(GetNthParamAny): Ditto.
	(NoOfParamAny): Ditto.
	(IsProcedureAnyNoReturn): Ditto.
	(GetProcedureKind): Ditto.
	(IsVarParamAny): Ditto.
	(IsUnboundedParamAny): Ditto.
	(ForeachParamSymDo): New comment.
	* gm2-libs-coroutines/SYSTEM.mod: Reformat.

gcc/testsuite/ChangeLog:

	* gm2/iso/fail/badexpression3.mod: New test.
	* gm2/iso/fail/badparam4.def: New test.
	* gm2/iso/fail/badparam4.mod: New test.

Signed-off-by: Gaius Mulley <gaiusmod2@gmail.com>

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