X-Git-Url: http://andersk.mit.edu/gitweb/splint.git/blobdiff_plain/6970c11be2c0e175abf98c906a87115836e4f55f..52e90c0f77bb0e3edb043873b71a73459d4ae8ab:/src/cgrammar.y diff --git a/src/cgrammar.y b/src/cgrammar.y index 9817a79..5c4f2d8 100644 --- a/src/cgrammar.y +++ b/src/cgrammar.y @@ -1,32 +1,37 @@ /*;-*-C-*-; -** Copyright (c) Massachusetts Institute of Technology 1994-1998. -** All Rights Reserved. -** Unpublished rights reserved under the copyright laws of -** the United States. +** Splint - annotation-assisted static program checker +** Copyright (C) 1994-2002 University of Virginia, +** Massachusetts Institute of Technology ** -** THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED -** OR IMPLIED. ANY USE IS AT YOUR OWN RISK. +** This program 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 2 of the License, or (at your +** option) any later version. +** +** This program 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. +** +** The GNU General Public License is available from http://www.gnu.org/ or +** the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, +** MA 02111-1307, USA. ** -** This code is distributed freely and may be used freely under the -** following conditions: -** -** 1. This notice may not be removed or altered. -** -** 2. Works derived from this code are not distributed for -** commercial gain without explicit permission from MIT -** (for permission contact lclint-request@sds.lcs.mit.edu). +** For information on splint: info@splint.org +** To report a bug: splint-bug@splint.org +** For more information: http://www.splint.org */ %{ /* ** ** cgrammar.y ** -** Yacc/Bison grammar for extended ANSI C used by LCLint. +** Yacc/Bison grammar for extended ANSI C used by Splint. ** ** original grammar by Nate Osgood --- ** hacrat@catfish.lcs.mit.edu Mon Jun 14 13:06:32 1993 ** -** changes for LCLint --- handle typedef names correctly +** changes for Splint --- handle typedef names correctly ** fix struct/union parsing bug (empty struct is accepted) ** add productions to handle macros --- require ** error correction --- main source of conflicts in grammar. @@ -45,7 +50,7 @@ extern int yylex (); extern void swallowMacro (void); extern void yyerror (char *); -# include "lclintMacros.nf" +# include "splintMacros.nf" # include "basic.h" # include "cscanner.h" # include "cgrammar.h" @@ -110,7 +115,7 @@ extern void yyerror (char *); /*@only@*/ uentry oentry; /*@only@*/ exprNode expr; /*@only@*/ enumNameList enumnamelist; - /*@only@*/ exprNodeList alist; + /*@only@*/ exprNodeList exprlist; /*@only@*/ sRefSet srset; /*@only@*/ cstringList cstringlist; @@ -131,7 +136,7 @@ extern void yyerror (char *); %token TSEMI TLBRACE TRBRACE TCOMMA TCOLON TASSIGN TLPAREN %token TRPAREN TLSQBR TRSQBR TDOT TAMPERSAND TEXCL TTILDE %token TMINUS TPLUS TMULT TDIV TPERCENT TLT TGT TCIRC TBAR TQUEST -%token CSIZEOF CALIGNOF ARROW_OP CTYPEDEF COFFSETOF +%token CSIZEOF CALIGNOF CTYPEOF ARROW_OP CTYPEDEF COFFSETOF %token INC_OP DEC_OP LEFT_OP RIGHT_OP %token LE_OP GE_OP EQ_OP NE_OP AND_OP OR_OP %token MUL_ASSIGN DIV_ASSIGN MOD_ASSIGN ADD_ASSIGN SUB_ASSIGN @@ -151,12 +156,13 @@ extern void yyerror (char *); %token QSETS %token QRELEASES %token QPRECLAUSE -%token QPOSTCLAUSE +%token QPOSTCLAUSE +%token QINVARIANT %token QALT %token QUNDEF QKILLED %token QENDMACRO -/* additional tokens introduced by lclint pre-processor. */ +/* additional tokens introduced by splint pre-processor. */ %token LLMACRO LLMACROITER LLMACROEND TENDMACRO /* break comments: */ @@ -190,7 +196,6 @@ extern void yyerror (char *); %token CGCHAR CBOOL CINT CGFLOAT CDOUBLE CVOID %token QANYTYPE QINTEGRALTYPE QUNSIGNEDINTEGRALTYPE QSIGNEDINTEGRALTYPE -%type nullterminatedQualifier %token QNULLTERMINATED %token QSETBUFFERSIZE %token QSETSTRINGLENGTH @@ -217,7 +222,7 @@ extern void yyerror (char *); %type globalsClause globalsClausePlain %type modifiesClause modifiesClausePlain nomodsClause -%type warnClause warnClausePlain +%type warnClause warnClausePlain optWarnClause %type conditionClause conditionClausePlain %type stateClause stateClausePlain %type metaStateConstraint @@ -254,8 +259,8 @@ extern void yyerror (char *); %type structNamedDeclList %type genericParamList paramTypeList paramList idList paramIdList -%type argumentExprList iterArgList -%type initList +%type argumentExprList iterArgList +%type initList namedInitializerList namedInitializerListAux %type structDeclList structDecl %type locModifies modList specClauseList optSpecClauseList %type mExpr modListExpr specClauseListExpr @@ -273,8 +278,13 @@ extern void yyerror (char *); %type BufConstraintList +%type optStructInvariant + %type BufUnaryOp +/*drl 1/6/2002 either /\ or && */ +%type constraintSeperator + %type enumeratorList %type fieldDesignator @@ -297,13 +307,15 @@ extern void yyerror (char *); %type compoundStmt compoundStmtAux compoundStmtRest compoundStmtAuxErr %type expressionStmt selectionStmt iterationStmt jumpStmt iterDefIterationStmt %type stmtErr stmtListErr compoundStmtErr expressionStmtErr -%type iterationStmtErr initializerList initializer ifPred whilePred forPred iterWhilePred +%type iterationStmtErr initializerList typeInitializerList initializer +%type ifPred whilePred forPred iterWhilePred typeInitializer + +%type designator designatorList designation %type storageSpecifier typeQualifier typeModifier globQual %type optGlobQuals %type completeType completeTypeSpecifier optCompleteType %type completeTypeSpecifierAux altType typeExpression -/*%type lclintassertion*/ %start file @@ -314,8 +326,8 @@ file | externalDefs externalDefs - : externalDef - | externalDefs externalDef + : externalDef { context_checkGlobalScope (); } + | externalDefs externalDef { context_checkGlobalScope (); } externalDef : fcnDef optSemi { uentry_clearDecl (); } @@ -324,6 +336,7 @@ externalDef | iterDecl { uentry_clearDecl (); } | macroDef { uentry_clearDecl (); } | initializer { uentry_checkDecl (); exprNode_free ($1); } + | TSEMI { uentry_clearDecl (); /* evans 2002-02-08: okay to have a null statement */ } | error { uentry_clearDecl (); } constantDecl @@ -359,10 +372,21 @@ namedDeclBase | IsType TLPAREN NotType namedDecl IsType TRPAREN { $$ = idDecl_expectFunction ($4); } | namedDeclBase TLSQBR TRSQBR - { $$ = idDecl_replaceCtype ($1, ctype_makeArray (idDecl_getCtype ($1))); } + { $$ = idDecl_replaceCtype ($1, ctype_makeInnerArray (idDecl_getCtype ($1))); } | namedDeclBase TLSQBR IsType constantExpr TRSQBR NotType - { - $$ = idDecl_replaceCtype ($1, ctype_makeFixedArray (idDecl_getCtype ($1), exprNode_getLongValue ($4))); + { + exprNode_findValue ($4); + idDecl_notExpectingFunction ($1); + + if (exprNode_hasValue ($4)) + { + $$ = idDecl_replaceCtype ($1, ctype_makeInnerFixedArray (idDecl_getCtype ($1), + exprNode_getLongValue ($4))); + } + else + { + $$ = idDecl_replaceCtype ($1, ctype_makeInnerArray (idDecl_getCtype ($1))); + } } | namedDeclBase PushType TLPAREN TRPAREN { setCurrentParams (uentryList_missingParams); } @@ -392,7 +416,7 @@ plainNamedDeclBase | IsType TLPAREN NotType plainNamedDecl IsType TRPAREN { $$ = idDecl_expectFunction ($4); } | plainNamedDeclBase TLSQBR TRSQBR - { $$ = idDecl_replaceCtype ($1, ctype_makeArray (idDecl_getCtype ($1))); } + { $$ = idDecl_replaceCtype ($1, ctype_makeInnerArray (idDecl_getCtype ($1))); } | plainNamedDeclBase TLSQBR IsType constantExpr TRSQBR NotType { int value; @@ -407,7 +431,7 @@ plainNamedDeclBase value = 0; } - $$ = idDecl_replaceCtype ($1, ctype_makeFixedArray (idDecl_getCtype ($1), value)); + $$ = idDecl_replaceCtype ($1, ctype_makeInnerFixedArray (idDecl_getCtype ($1), value)); } | plainNamedDeclBase PushType TLPAREN TRPAREN { setCurrentParams (uentryList_missingParams); } @@ -466,8 +490,12 @@ metaStateName /*drl*/ +constraintSeperator +: TCAND +| AND_OP + BufConstraintList -: BufConstraint TCAND BufConstraintList { $$ = constraintList_add ($3, $1); } +: BufConstraint constraintSeperator BufConstraintList { $$ = constraintList_add ($3, $1); } | BufConstraint { $$ = constraintList_single ($1); } BufConstraint @@ -615,6 +643,10 @@ flagSpec flagId : NEW_IDENTIFIER +optWarnClause + : warnClause + | /* empty */ { $$ = warnClause_undefined; } + warnClause : warnClausePlain QENDMACRO { $$ = $1; } @@ -679,20 +711,20 @@ fcnBody exprNode_checkFunctionBody ($3); $$ = $3; context_exitInner ($3); } - | initializerList - { doneParams (); context_enterInnerContext (); } + | { context_enterOldStyleScope (); } initializerList + { oldStyleDoneParams (); context_enterInnerContext (); } compoundStmt { - context_exitInner ($3); - exprNode_checkFunctionBody ($3); - $$ = $3; /* old style */ + exprNode_checkFunctionBody ($4); + $$ = $4; /* oldstyle */ + context_exitInner ($4); } fcnDef : fcnDefHdr fcnBody { context_setFunctionDefined (exprNode_loc ($2)); - exprNode_checkFunction (context_getHeader (), $2); + exprNode_checkFunction (context_getHeader (), $2); /* DRL 8 8 2000 */ context_exitFunction (); @@ -763,6 +795,9 @@ primaryExpr | TLPAREN expr TRPAREN { $$ = exprNode_addParens ($1, $2); } | TYPE_NAME_OR_ID { $$ = exprNode_fromIdentifier (coerceId ($1)); } | QEXTENSION { $$ = exprNode_makeError (); } + | TLPAREN { exprChecks_inCompoundStatementExpression (); } + compoundStmt TRPAREN + { exprChecks_leaveCompoundStatementExpression (); $$ = exprNode_compoundStatementExpression ($1, $3); } postfixExpr : primaryExpr @@ -774,7 +809,9 @@ postfixExpr | postfixExpr NotType ARROW_OP newId IsType { $$ = exprNode_arrowAccess ($1, $3, $4); } | postfixExpr INC_OP { $$ = exprNode_postOp ($1, $2); } | postfixExpr DEC_OP { $$ = exprNode_postOp ($1, $2); } - + | TLPAREN typeExpression TRPAREN TLBRACE typeInitializerList optComma TRBRACE + { /* added for C99 */ $$ = exprNode_undefined; /*@i87 no checking */ } + argumentExprList : assignExpr { $$ = exprNodeList_singleton ($1); } | argumentExprList TCOMMA assignExpr { $$ = exprNodeList_push ($1, $3); } @@ -963,7 +1000,8 @@ namedInitializer typeDecl : CTYPEDEF completeTypeSpecifier { setProcessingTypedef ($2); } - NotType namedInitializerList IsType TSEMI { unsetProcessingTypedef (); } + NotType namedInitializerList IsType optWarnClause TSEMI + { clabstract_declareType ($5, $7); } | CTYPEDEF completeTypeSpecifier IsType TSEMI { /* in the ANSI grammar, semantics unclear */ } | CTYPEDEF namedInitializerList IsType TSEMI { /* in the ANSI grammar, semantics unclear */ } @@ -974,11 +1012,11 @@ PushType : { g_expectingTypeName = TRUE; context_pushLoc (); } namedInitializerList - : namedInitializerListAux IsType { ; } + : namedInitializerListAux IsType { $$ = $1; } namedInitializerListAux - : namedInitializer { ; } - | namedInitializerList TCOMMA NotType namedInitializer { ; } + : namedInitializer { $$ = exprNodeList_singleton ($1); } + | namedInitializerList TCOMMA NotType namedInitializer { $$ = exprNodeList_push ($1, $4); } optDeclarators : /* empty */ { $$ = exprNode_makeError (); } @@ -988,7 +1026,24 @@ init : assignExpr | TLBRACE initList TRBRACE { $$ = exprNode_makeInitBlock ($1, $2); } | TLBRACE initList TCOMMA TRBRACE { $$ = exprNode_makeInitBlock ($1, $2); } + | designation init { $$ = exprNode_undefined; } +/* +** Splint parses these (added in ISO C99), but no checking yet... +*/ + +designation + : designatorList TASSIGN { $$ = $1; } + | newId TCOLON { $$ = exprNode_undefined; + /* gcc extension, obsolete since 2.5 */ } + +designatorList + : designator { $$ = exprNode_undefined; } + | designatorList designator { $$ = exprNode_undefined; } + +designator + : TLSQBR constantExpr TRSQBR { $$ = exprNode_undefined; } + | TDOT newId { $$ = exprNode_undefined; } initList : init @@ -1008,9 +1063,6 @@ storageSpecifier | QAUTO { $$ = qual_createAuto (); } | QREGISTER { $$ = qual_createRegister (); } -nullterminatedQualifier: - QNULLTERMINATED IsType { $$ = qual_createNullTerminated (); } - stateClause : stateClausePlain QENDMACRO { $$ = $1; } @@ -1211,12 +1263,20 @@ optCompleteType : /* empty */ { $$ = qtype_unknown (); } | completeTypeSpecifier { $$ = $1; } + +optStructInvariant +: /* empty */ { $$ = constraintList_undefined; } +/* don't want to have support for structure invariant until we're + sure it's stable + | QINVARIANT BufConstraintList QENDMACRO { $$ = $2 } +*/ + suSpc : NotType CSTRUCT newId IsType TLBRACE { sRef_setGlobalScopeSafe (); } CreateStructInnerScope - structDeclList DeleteStructInnerScope { sRef_clearGlobalScopeSafe (); } + structDeclList DeleteStructInnerScope { sRef_clearGlobalScopeSafe (); } TRBRACE - { $$ = declareStruct ($3, $8); } + optStructInvariant { {ctype ct; ct = declareStruct ($3, $8); /* setGlobalStructInfo(ct, $12);*/ $$ = ct;} } | NotType CUNION newId IsType TLBRACE { sRef_setGlobalScopeSafe (); } CreateStructInnerScope structDeclList DeleteStructInnerScope { sRef_clearGlobalScopeSafe (); } @@ -1396,9 +1456,9 @@ abstractDeclBase | TLSQBR TRSQBR { $$ = ctype_makeArray (ctype_unknown); } | TLSQBR constantExpr TRSQBR { $$ = ctype_makeFixedArray (ctype_unknown, exprNode_getLongValue ($2)); } - | abstractDeclBase TLSQBR TRSQBR { $$ = ctype_makeArray ($1); } + | abstractDeclBase TLSQBR TRSQBR { $$ = ctype_makeInnerArray ($1); } | abstractDeclBase TLSQBR constantExpr TRSQBR - { $$ = ctype_makeFixedArray ($1, exprNode_getLongValue ($3)); } + { $$ = ctype_makeInnerFixedArray ($1, exprNode_getLongValue ($3)); } | IsType TLPAREN TRPAREN { $$ = ctype_makeFunction (ctype_unknown, uentryList_makeMissingParams ()); } | IsType TLPAREN paramTypeList TRPAREN @@ -1420,18 +1480,7 @@ stmt | iterationStmt | iterStmt | jumpStmt -/* | lclintassertion {$$ = $1; printf ("Doing stmt lclintassertion\n"); }*/ -/* -lclintassertion - : QSETBUFFERSIZE id CCONSTANT QENDMACRO { printf(" QSETBUFFERSIZE id CCONSTANT HEllo World\n"); uentry_setBufferSize($2, $3); $$ = exprNode_createTok ($4); - } - | QSETSTRINGLENGTH id CCONSTANT QENDMACRO { printf(" QSETSTRINGLENGTH id CCONSTANT HEllo World\n"); uentry_setStringLength($2, $3); $$ = exprNode_createTok ($4); - } - | QTESTINRANGE id CCONSTANT QENDMACRO {printf(" QTESTINRANGE\n"); uentry_testInRange($2, $3); $$ = exprNode_createTok ($4); - } - -/* | QSETBUFFERSIZE id id {$$ = $2; printf(" QSETBUFFERSIZE id id HEllo World\n");} */ iterBody : iterDefStmtList { $$ = $1; } @@ -1484,9 +1533,9 @@ iterDefStmt | error { $$ = exprNode_makeError (); } iterSelectionStmt - : ifPred iterDefStmt + : ifPred { exprNode_checkIfPred ($1); } iterDefStmt { /* don't: context_exitTrueClause ($1, $2); */ - $$ = exprNode_if ($1, $2); + $$ = exprNode_if ($1, $3); } openScope @@ -1516,20 +1565,28 @@ labeledStmt : newId TCOLON { $$ = exprNode_labelMarker ($1); } | QNOTREACHED stmt { $$ = exprNode_notReached ($2); } +/* +** We allow more than one QFALLTHROUGH token to support mixed lint/splint markers. +*/ + +optExtraFallThroughs + : /* empty */ { ; } + | QFALLTHROUGH optExtraFallThroughs { ; } + /* Note that we can semantically check that the object to the case is indeed constant. In this case, we may not want to go through this effort */ caseStmt : CASE constantExpr { context_enterCaseClause ($2); } TCOLON { $$ = exprNode_caseMarker ($2, FALSE); } - | QFALLTHROUGH CASE constantExpr { context_enterCaseClause ($3); } - TCOLON { $$ = exprNode_caseMarker ($3, TRUE); } + | QFALLTHROUGH optExtraFallThroughs CASE constantExpr { context_enterCaseClause ($4); } + TCOLON { $$ = exprNode_caseMarker ($4, TRUE); } defaultStmt : DEFAULT { context_enterCaseClause (exprNode_undefined); } TCOLON { $$ = exprNode_defaultMarker ($1, FALSE); } - | QFALLTHROUGH DEFAULT { context_enterCaseClause (exprNode_undefined); } - TCOLON { $$ = exprNode_defaultMarker ($2, TRUE); } + | QFALLTHROUGH optExtraFallThroughs DEFAULT { context_enterCaseClause (exprNode_undefined); } + TCOLON { $$ = exprNode_defaultMarker ($3, TRUE); } compoundStmt : TLPAREN compoundStmt TRPAREN { $$ = $2; } @@ -1570,7 +1627,6 @@ compoundStmtRest lltok_getLoc ($3))); } - compoundStmtAux : TLBRACE compoundStmtRest { $$ = exprNode_makeBlock ($2); } @@ -1593,6 +1649,14 @@ initializerList : initializer { $$ = $1; } | initializerList initializer { $$ = exprNode_concat ($1, $2); } +typeInitializerList + : typeInitializer { $$ = $1; } + | typeInitializerList TCOMMA typeInitializer { $$ = exprNode_concat ($1, $3); } + +typeInitializer + : assignExpr { $$ = $1; } + | TLBRACE typeInitializerList optComma TRBRACE { $$ = $2; } + stmtList : stmt { $$ = $1; } | stmtList stmt { $$ = exprNode_concat ($1, $2); } @@ -1608,7 +1672,12 @@ expressionStmtErr ifPred : CIF TLPAREN expr TRPAREN - { $$ = $3; exprNode_produceGuards ($3); context_enterTrueClause ($3); } + { + exprNode_produceGuards ($3); context_enterTrueClause ($3); + exprNode_checkIfPred ($3); + $$ = $3; + } + /* ** not ANSI: | CIF TLPAREN compoundStmt TRPAREN ** { $$ = $3; context_enterTrueClause (); } @@ -1620,7 +1689,7 @@ selectionStmt context_exitTrueClause ($1, $2); $$ = exprNode_if ($1, $2); } - | ifPred stmt CELSE { context_enterFalseClause ($1); } stmt + | ifPred stmt CELSE { context_enterFalseClause ($1); } stmt { context_exitClause ($1, $2, $5); $$ = exprNode_ifelse ($1, $2, $5); @@ -1816,6 +1885,10 @@ optSemi : | TSEMI { ; } +optComma + : + | TCOMMA { ; } + id : IDENTIFIER @@ -1829,6 +1902,8 @@ newId typeName : TYPE_NAME | TYPE_NAME_OR_ID { $$ = ctype_unknown; } + | CTYPEOF TLPAREN expr TRPAREN { $$ = exprNode_getType ($3); exprNode_free ($3); } + | CTYPEOF TLPAREN typeExpression TRPAREN { $$ = qtype_getType ($3); } %% @@ -1857,7 +1932,7 @@ void yyerror (/*@unused@*/ char *s) llerror (FLG_SYNTAX, message ("Macro syntax not parseable: %s", context_inFunctionName ())); - if (context_inMacroUnknown ()) + if (context_inUnknownMacro ()) { if (!givehint) {