CheckerContext.h revision 4e4d08403ca5cfd4d558fa2936215d3a4e5a528d
16bcb48dc67e417e0ecce803f28d13bbea2ee0243Argyrios Kyrtzidis//== CheckerContext.h - Context info for path-sensitive checkers--*- C++ -*--=// 26bcb48dc67e417e0ecce803f28d13bbea2ee0243Argyrios Kyrtzidis// 36bcb48dc67e417e0ecce803f28d13bbea2ee0243Argyrios Kyrtzidis// The LLVM Compiler Infrastructure 46bcb48dc67e417e0ecce803f28d13bbea2ee0243Argyrios Kyrtzidis// 56bcb48dc67e417e0ecce803f28d13bbea2ee0243Argyrios Kyrtzidis// This file is distributed under the University of Illinois Open Source 66bcb48dc67e417e0ecce803f28d13bbea2ee0243Argyrios Kyrtzidis// License. See LICENSE.TXT for details. 76bcb48dc67e417e0ecce803f28d13bbea2ee0243Argyrios Kyrtzidis// 86bcb48dc67e417e0ecce803f28d13bbea2ee0243Argyrios Kyrtzidis//===----------------------------------------------------------------------===// 96bcb48dc67e417e0ecce803f28d13bbea2ee0243Argyrios Kyrtzidis// 106bcb48dc67e417e0ecce803f28d13bbea2ee0243Argyrios Kyrtzidis// This file defines CheckerContext that provides contextual info for 116bcb48dc67e417e0ecce803f28d13bbea2ee0243Argyrios Kyrtzidis// path-sensitive checkers. 126bcb48dc67e417e0ecce803f28d13bbea2ee0243Argyrios Kyrtzidis// 136bcb48dc67e417e0ecce803f28d13bbea2ee0243Argyrios Kyrtzidis//===----------------------------------------------------------------------===// 146bcb48dc67e417e0ecce803f28d13bbea2ee0243Argyrios Kyrtzidis 156bcb48dc67e417e0ecce803f28d13bbea2ee0243Argyrios Kyrtzidis#ifndef LLVM_CLANG_SA_CORE_PATHSENSITIVE_CHECKERCONTEXT 166bcb48dc67e417e0ecce803f28d13bbea2ee0243Argyrios Kyrtzidis#define LLVM_CLANG_SA_CORE_PATHSENSITIVE_CHECKERCONTEXT 176bcb48dc67e417e0ecce803f28d13bbea2ee0243Argyrios Kyrtzidis 186bcb48dc67e417e0ecce803f28d13bbea2ee0243Argyrios Kyrtzidis#include "clang/StaticAnalyzer/Core/PathSensitive/ExprEngine.h" 196bcb48dc67e417e0ecce803f28d13bbea2ee0243Argyrios Kyrtzidis 206bcb48dc67e417e0ecce803f28d13bbea2ee0243Argyrios Kyrtzidisnamespace clang { 216bcb48dc67e417e0ecce803f28d13bbea2ee0243Argyrios Kyrtzidisnamespace ento { 226bcb48dc67e417e0ecce803f28d13bbea2ee0243Argyrios Kyrtzidis 236bcb48dc67e417e0ecce803f28d13bbea2ee0243Argyrios Kyrtzidisclass CheckerContext { 246bcb48dc67e417e0ecce803f28d13bbea2ee0243Argyrios Kyrtzidis ExprEngine &Eng; 2557300760964904cc022a175643342f29f46b7e6bAnna Zaks /// The current exploded(symbolic execution) graph node. 266bcb48dc67e417e0ecce803f28d13bbea2ee0243Argyrios Kyrtzidis ExplodedNode *Pred; 2757300760964904cc022a175643342f29f46b7e6bAnna Zaks /// The flag is true if the (state of the execution) has been modified 2857300760964904cc022a175643342f29f46b7e6bAnna Zaks /// by the checker using this context. For example, a new transition has been 2957300760964904cc022a175643342f29f46b7e6bAnna Zaks /// added or a bug report issued. 3057300760964904cc022a175643342f29f46b7e6bAnna Zaks bool Changed; 3157300760964904cc022a175643342f29f46b7e6bAnna Zaks /// The tagged location, which is used to generate all new nodes. 323f5e8d87dbf449d8b39fe96068415428594d370eAnna Zaks const ProgramPoint Location; 333152b3cb5b6a2f797d0972c81a5eb3fd69c0d620Anna Zaks NodeBuilder &NB; 34063e0887ad65d666d23ee3178436ad6507abbd1bAnna Zaks 356bcb48dc67e417e0ecce803f28d13bbea2ee0243Argyrios Kyrtzidispublic: 368ff5c41f2bde7ebbe568b4c15e59f14b8befae66Anna Zaks CheckerContext(NodeBuilder &builder, 3718c66fdc3c4008d335885695fe36fb5353c5f672Ted Kremenek ExprEngine &eng, 3818c66fdc3c4008d335885695fe36fb5353c5f672Ted Kremenek ExplodedNode *pred, 39063e0887ad65d666d23ee3178436ad6507abbd1bAnna Zaks const ProgramPoint &loc) 408ff5c41f2bde7ebbe568b4c15e59f14b8befae66Anna Zaks : Eng(eng), 4118c66fdc3c4008d335885695fe36fb5353c5f672Ted Kremenek Pred(pred), 4257300760964904cc022a175643342f29f46b7e6bAnna Zaks Changed(false), 433f5e8d87dbf449d8b39fe96068415428594d370eAnna Zaks Location(loc), 44777d706547ebc751d998134774d9d5388fff8e02Anna Zaks NB(builder) { 45777d706547ebc751d998134774d9d5388fff8e02Anna Zaks assert(Pred->getState() && 46777d706547ebc751d998134774d9d5388fff8e02Anna Zaks "We should not call the checkers on an empty state."); 47777d706547ebc751d998134774d9d5388fff8e02Anna Zaks } 486bcb48dc67e417e0ecce803f28d13bbea2ee0243Argyrios Kyrtzidis 496bcb48dc67e417e0ecce803f28d13bbea2ee0243Argyrios Kyrtzidis AnalysisManager &getAnalysisManager() { 506bcb48dc67e417e0ecce803f28d13bbea2ee0243Argyrios Kyrtzidis return Eng.getAnalysisManager(); 516bcb48dc67e417e0ecce803f28d13bbea2ee0243Argyrios Kyrtzidis } 526bcb48dc67e417e0ecce803f28d13bbea2ee0243Argyrios Kyrtzidis 536bcb48dc67e417e0ecce803f28d13bbea2ee0243Argyrios Kyrtzidis ConstraintManager &getConstraintManager() { 546bcb48dc67e417e0ecce803f28d13bbea2ee0243Argyrios Kyrtzidis return Eng.getConstraintManager(); 556bcb48dc67e417e0ecce803f28d13bbea2ee0243Argyrios Kyrtzidis } 566bcb48dc67e417e0ecce803f28d13bbea2ee0243Argyrios Kyrtzidis 576bcb48dc67e417e0ecce803f28d13bbea2ee0243Argyrios Kyrtzidis StoreManager &getStoreManager() { 586bcb48dc67e417e0ecce803f28d13bbea2ee0243Argyrios Kyrtzidis return Eng.getStoreManager(); 596bcb48dc67e417e0ecce803f28d13bbea2ee0243Argyrios Kyrtzidis } 606bcb48dc67e417e0ecce803f28d13bbea2ee0243Argyrios Kyrtzidis 61a2a860306e3697fcf7a12c5ba59551ca60578968Anna Zaks /// \brief Returns the previous node in the exploded graph, which includes 62a2a860306e3697fcf7a12c5ba59551ca60578968Anna Zaks /// the state of the program before the checker ran. Note, checkers should 63a2a860306e3697fcf7a12c5ba59551ca60578968Anna Zaks /// not retain the node in their state since the nodes might get invalidated. 6439ac1876f6f9a1a8e0070f0df61036c7ba05202bAnna Zaks ExplodedNode *getPredecessor() { return Pred; } 658bef8238181a30e52dea380789a7e2d760eac532Ted Kremenek ProgramStateRef getState() const { return Pred->getState(); } 666bcb48dc67e417e0ecce803f28d13bbea2ee0243Argyrios Kyrtzidis 6757300760964904cc022a175643342f29f46b7e6bAnna Zaks /// \brief Check if the checker changed the state of the execution; ex: added 6857300760964904cc022a175643342f29f46b7e6bAnna Zaks /// a new transition or a bug report. 6957300760964904cc022a175643342f29f46b7e6bAnna Zaks bool isDifferent() { return Changed; } 7057300760964904cc022a175643342f29f46b7e6bAnna Zaks 715d0ea6d62e076c776ddad028c4eb615783be1323Anna Zaks /// \brief Returns the number of times the current block has been visited 725d0ea6d62e076c776ddad028c4eb615783be1323Anna Zaks /// along the analyzed path. 73eeea7c44a6986752fedee1ef1bcef855db373872Anna Zaks unsigned getCurrentBlockCount() const { 74ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks return NB.getContext().getCurrentBlockCount(); 75ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks } 765d0ea6d62e076c776ddad028c4eb615783be1323Anna Zaks 776bcb48dc67e417e0ecce803f28d13bbea2ee0243Argyrios Kyrtzidis ASTContext &getASTContext() { 786bcb48dc67e417e0ecce803f28d13bbea2ee0243Argyrios Kyrtzidis return Eng.getContext(); 796bcb48dc67e417e0ecce803f28d13bbea2ee0243Argyrios Kyrtzidis } 80461af1e502c9bd88330bbf17d449a7593fc0d624Anna Zaks 814e4d08403ca5cfd4d558fa2936215d3a4e5a528dDavid Blaikie const LangOptions &getLangOpts() const { 824e4d08403ca5cfd4d558fa2936215d3a4e5a528dDavid Blaikie return Eng.getContext().getLangOpts(); 83461af1e502c9bd88330bbf17d449a7593fc0d624Anna Zaks } 84461af1e502c9bd88330bbf17d449a7593fc0d624Anna Zaks 85eeea7c44a6986752fedee1ef1bcef855db373872Anna Zaks const LocationContext *getLocationContext() const { 8639ac1876f6f9a1a8e0070f0df61036c7ba05202bAnna Zaks return Pred->getLocationContext(); 8739ac1876f6f9a1a8e0070f0df61036c7ba05202bAnna Zaks } 8839ac1876f6f9a1a8e0070f0df61036c7ba05202bAnna Zaks 896bcb48dc67e417e0ecce803f28d13bbea2ee0243Argyrios Kyrtzidis BugReporter &getBugReporter() { 906bcb48dc67e417e0ecce803f28d13bbea2ee0243Argyrios Kyrtzidis return Eng.getBugReporter(); 916bcb48dc67e417e0ecce803f28d13bbea2ee0243Argyrios Kyrtzidis } 926bcb48dc67e417e0ecce803f28d13bbea2ee0243Argyrios Kyrtzidis 936bcb48dc67e417e0ecce803f28d13bbea2ee0243Argyrios Kyrtzidis SourceManager &getSourceManager() { 946bcb48dc67e417e0ecce803f28d13bbea2ee0243Argyrios Kyrtzidis return getBugReporter().getSourceManager(); 956bcb48dc67e417e0ecce803f28d13bbea2ee0243Argyrios Kyrtzidis } 966bcb48dc67e417e0ecce803f28d13bbea2ee0243Argyrios Kyrtzidis 976bcb48dc67e417e0ecce803f28d13bbea2ee0243Argyrios Kyrtzidis SValBuilder &getSValBuilder() { 986bcb48dc67e417e0ecce803f28d13bbea2ee0243Argyrios Kyrtzidis return Eng.getSValBuilder(); 996bcb48dc67e417e0ecce803f28d13bbea2ee0243Argyrios Kyrtzidis } 1006bcb48dc67e417e0ecce803f28d13bbea2ee0243Argyrios Kyrtzidis 1013f10e32b15e54f507aed90cb72d73c7acaa500bbAnna Zaks SymbolManager &getSymbolManager() { 1023f10e32b15e54f507aed90cb72d73c7acaa500bbAnna Zaks return getSValBuilder().getSymbolManager(); 1033f10e32b15e54f507aed90cb72d73c7acaa500bbAnna Zaks } 1043f10e32b15e54f507aed90cb72d73c7acaa500bbAnna Zaks 105eeea7c44a6986752fedee1ef1bcef855db373872Anna Zaks bool isObjCGCEnabled() const { 10617a38e2636a8b1ce473fc6504c4b16cb09db29f4Jordy Rose return Eng.isObjCGCEnabled(); 10717a38e2636a8b1ce473fc6504c4b16cb09db29f4Jordy Rose } 10817a38e2636a8b1ce473fc6504c4b16cb09db29f4Jordy Rose 1096a93bd526c5136ee5a26871e829cf5a8548a1c6aAnna Zaks ProgramStateManager &getStateManager() { 1106a93bd526c5136ee5a26871e829cf5a8548a1c6aAnna Zaks return Eng.getStateManager(); 1116a93bd526c5136ee5a26871e829cf5a8548a1c6aAnna Zaks } 1126a93bd526c5136ee5a26871e829cf5a8548a1c6aAnna Zaks 113063e0887ad65d666d23ee3178436ad6507abbd1bAnna Zaks AnalysisDeclContext *getCurrentAnalysisDeclContext() const { 114063e0887ad65d666d23ee3178436ad6507abbd1bAnna Zaks return Pred->getLocationContext()->getAnalysisDeclContext(); 115063e0887ad65d666d23ee3178436ad6507abbd1bAnna Zaks } 116063e0887ad65d666d23ee3178436ad6507abbd1bAnna Zaks 1170bd6b110e908892d4b5c8671a9f435a1d72ad16aAnna Zaks /// \brief Generates a new transition in the program state graph 1180bd6b110e908892d4b5c8671a9f435a1d72ad16aAnna Zaks /// (ExplodedGraph). Uses the default CheckerContext predecessor node. 1190bd6b110e908892d4b5c8671a9f435a1d72ad16aAnna Zaks /// 1200bd6b110e908892d4b5c8671a9f435a1d72ad16aAnna Zaks /// @param State The state of the generated node. 1210bd6b110e908892d4b5c8671a9f435a1d72ad16aAnna Zaks /// @param Tag The tag is used to uniquely identify the creation site. If no 1220bd6b110e908892d4b5c8671a9f435a1d72ad16aAnna Zaks /// tag is specified, a default tag, unique to the given checker, 1230bd6b110e908892d4b5c8671a9f435a1d72ad16aAnna Zaks /// will be used. Tags are used to prevent states generated at 1240bd6b110e908892d4b5c8671a9f435a1d72ad16aAnna Zaks /// different sites from caching out. 1258bef8238181a30e52dea380789a7e2d760eac532Ted Kremenek ExplodedNode *addTransition(ProgramStateRef State, 1260bd6b110e908892d4b5c8671a9f435a1d72ad16aAnna Zaks const ProgramPointTag *Tag = 0) { 1270bd6b110e908892d4b5c8671a9f435a1d72ad16aAnna Zaks return addTransitionImpl(State, false, 0, Tag); 1286bcb48dc67e417e0ecce803f28d13bbea2ee0243Argyrios Kyrtzidis } 1290bd6b110e908892d4b5c8671a9f435a1d72ad16aAnna Zaks 1300bd6b110e908892d4b5c8671a9f435a1d72ad16aAnna Zaks /// \brief Generates a default transition (containing checker tag but no 1310bd6b110e908892d4b5c8671a9f435a1d72ad16aAnna Zaks /// checker state changes). 1320bd6b110e908892d4b5c8671a9f435a1d72ad16aAnna Zaks ExplodedNode *addTransition() { 1330bd6b110e908892d4b5c8671a9f435a1d72ad16aAnna Zaks return addTransition(getState()); 134063e0887ad65d666d23ee3178436ad6507abbd1bAnna Zaks } 135063e0887ad65d666d23ee3178436ad6507abbd1bAnna Zaks 1360bd6b110e908892d4b5c8671a9f435a1d72ad16aAnna Zaks /// \brief Generates a new transition with the given predecessor. 1378ba721428af297e540fb40b176eeeea0ee010c1fAnna Zaks /// Allows checkers to generate a chain of nodes. 1380bd6b110e908892d4b5c8671a9f435a1d72ad16aAnna Zaks /// 1390bd6b110e908892d4b5c8671a9f435a1d72ad16aAnna Zaks /// @param State The state of the generated node. 1400bd6b110e908892d4b5c8671a9f435a1d72ad16aAnna Zaks /// @param Pred The transition will be generated from the specified Pred node 1410bd6b110e908892d4b5c8671a9f435a1d72ad16aAnna Zaks /// to the newly generated node. 1420bd6b110e908892d4b5c8671a9f435a1d72ad16aAnna Zaks /// @param Tag The tag to uniquely identify the creation site. 1430bd6b110e908892d4b5c8671a9f435a1d72ad16aAnna Zaks /// @param IsSink Mark the new node as sink, which will stop exploration of 1440bd6b110e908892d4b5c8671a9f435a1d72ad16aAnna Zaks /// the given path. 1458bef8238181a30e52dea380789a7e2d760eac532Ted Kremenek ExplodedNode *addTransition(ProgramStateRef State, 1460bd6b110e908892d4b5c8671a9f435a1d72ad16aAnna Zaks ExplodedNode *Pred, 1470bd6b110e908892d4b5c8671a9f435a1d72ad16aAnna Zaks const ProgramPointTag *Tag = 0, 1480bd6b110e908892d4b5c8671a9f435a1d72ad16aAnna Zaks bool IsSink = false) { 1490bd6b110e908892d4b5c8671a9f435a1d72ad16aAnna Zaks return addTransitionImpl(State, IsSink, Pred, Tag); 1506bcb48dc67e417e0ecce803f28d13bbea2ee0243Argyrios Kyrtzidis } 1516bcb48dc67e417e0ecce803f28d13bbea2ee0243Argyrios Kyrtzidis 1528ba721428af297e540fb40b176eeeea0ee010c1fAnna Zaks /// \brief Generate a sink node. Generating sink stops exploration of the 1538ba721428af297e540fb40b176eeeea0ee010c1fAnna Zaks /// given path. 1548bef8238181a30e52dea380789a7e2d760eac532Ted Kremenek ExplodedNode *generateSink(ProgramStateRef state = 0) { 1550bd6b110e908892d4b5c8671a9f435a1d72ad16aAnna Zaks return addTransitionImpl(state ? state : getState(), true); 1566bcb48dc67e417e0ecce803f28d13bbea2ee0243Argyrios Kyrtzidis } 1576bcb48dc67e417e0ecce803f28d13bbea2ee0243Argyrios Kyrtzidis 158063e0887ad65d666d23ee3178436ad6507abbd1bAnna Zaks /// \brief Emit the diagnostics report. 1596bcb48dc67e417e0ecce803f28d13bbea2ee0243Argyrios Kyrtzidis void EmitReport(BugReport *R) { 16057300760964904cc022a175643342f29f46b7e6bAnna Zaks Changed = true; 1616bcb48dc67e417e0ecce803f28d13bbea2ee0243Argyrios Kyrtzidis Eng.getBugReporter().EmitReport(R); 1626bcb48dc67e417e0ecce803f28d13bbea2ee0243Argyrios Kyrtzidis } 1636bcb48dc67e417e0ecce803f28d13bbea2ee0243Argyrios Kyrtzidis 164b805c8ff133ef0c62df032fa711d6b13c5afd7f4Anna Zaks /// \brief Get the declaration of the called function (path-sensitive). 165b805c8ff133ef0c62df032fa711d6b13c5afd7f4Anna Zaks const FunctionDecl *getCalleeDecl(const CallExpr *CE) const; 166b805c8ff133ef0c62df032fa711d6b13c5afd7f4Anna Zaks 1670e12ebfd3ef9ad5d894466c6e4910ac5e6041034Anna Zaks /// \brief Get the name of the called function (path-sensitive). 1689b0c749a20d0f7d0e63441d76baa15def3f37fdbAnna Zaks StringRef getCalleeName(const FunctionDecl *FunDecl) const; 1699b0c749a20d0f7d0e63441d76baa15def3f37fdbAnna Zaks 1709b0c749a20d0f7d0e63441d76baa15def3f37fdbAnna Zaks /// \brief Get the name of the called function (path-sensitive). 1719b0c749a20d0f7d0e63441d76baa15def3f37fdbAnna Zaks StringRef getCalleeName(const CallExpr *CE) const { 1729b0c749a20d0f7d0e63441d76baa15def3f37fdbAnna Zaks const FunctionDecl *FunDecl = getCalleeDecl(CE); 1739b0c749a20d0f7d0e63441d76baa15def3f37fdbAnna Zaks return getCalleeName(FunDecl); 1749b0c749a20d0f7d0e63441d76baa15def3f37fdbAnna Zaks } 1759b0c749a20d0f7d0e63441d76baa15def3f37fdbAnna Zaks 1769b0c749a20d0f7d0e63441d76baa15def3f37fdbAnna Zaks /// Given a function declaration and a name checks if this is a C lib 1779b0c749a20d0f7d0e63441d76baa15def3f37fdbAnna Zaks /// function with the given name. 1789b0c749a20d0f7d0e63441d76baa15def3f37fdbAnna Zaks bool isCLibraryFunction(const FunctionDecl *FD, StringRef Name); 179e00575f12cf280621ef0ed4d69e909bdfc9fef62Anna Zaks static bool isCLibraryFunction(const FunctionDecl *FD, StringRef Name, 180e00575f12cf280621ef0ed4d69e909bdfc9fef62Anna Zaks ASTContext &Context); 1810e12ebfd3ef9ad5d894466c6e4910ac5e6041034Anna Zaks 182461af1e502c9bd88330bbf17d449a7593fc0d624Anna Zaks /// \brief Depending on wither the location corresponds to a macro, return 183461af1e502c9bd88330bbf17d449a7593fc0d624Anna Zaks /// either the macro name or the token spelling. 184461af1e502c9bd88330bbf17d449a7593fc0d624Anna Zaks /// 185461af1e502c9bd88330bbf17d449a7593fc0d624Anna Zaks /// This could be useful when checkers' logic depends on whether a function 186461af1e502c9bd88330bbf17d449a7593fc0d624Anna Zaks /// is called with a given macro argument. For example: 187461af1e502c9bd88330bbf17d449a7593fc0d624Anna Zaks /// s = socket(AF_INET,..) 188461af1e502c9bd88330bbf17d449a7593fc0d624Anna Zaks /// If AF_INET is a macro, the result should be treated as a source of taint. 189461af1e502c9bd88330bbf17d449a7593fc0d624Anna Zaks /// 190461af1e502c9bd88330bbf17d449a7593fc0d624Anna Zaks /// \sa clang::Lexer::getSpelling(), clang::Lexer::getImmediateMacroName(). 191461af1e502c9bd88330bbf17d449a7593fc0d624Anna Zaks StringRef getMacroNameOrSpelling(SourceLocation &Loc); 192461af1e502c9bd88330bbf17d449a7593fc0d624Anna Zaks 1936bcb48dc67e417e0ecce803f28d13bbea2ee0243Argyrios Kyrtzidisprivate: 1948bef8238181a30e52dea380789a7e2d760eac532Ted Kremenek ExplodedNode *addTransitionImpl(ProgramStateRef State, 19539ac1876f6f9a1a8e0070f0df61036c7ba05202bAnna Zaks bool MarkAsSink, 19639ac1876f6f9a1a8e0070f0df61036c7ba05202bAnna Zaks ExplodedNode *P = 0, 19739ac1876f6f9a1a8e0070f0df61036c7ba05202bAnna Zaks const ProgramPointTag *Tag = 0) { 198c8bb3befcad8cd8fc9556bc265289b07dc3c94c8Anna Zaks if (!State || (State == Pred->getState() && !Tag && !MarkAsSink)) 199df95d146c13cf02e106b32b01d147577d6d6b5a1Anna Zaks return Pred; 200df95d146c13cf02e106b32b01d147577d6d6b5a1Anna Zaks 20157300760964904cc022a175643342f29f46b7e6bAnna Zaks Changed = true; 20239ac1876f6f9a1a8e0070f0df61036c7ba05202bAnna Zaks ExplodedNode *node = NB.generateNode(Tag ? Location.withTag(Tag) : Location, 20339ac1876f6f9a1a8e0070f0df61036c7ba05202bAnna Zaks State, 20439ac1876f6f9a1a8e0070f0df61036c7ba05202bAnna Zaks P ? P : Pred, MarkAsSink); 2056bcb48dc67e417e0ecce803f28d13bbea2ee0243Argyrios Kyrtzidis return node; 2066bcb48dc67e417e0ecce803f28d13bbea2ee0243Argyrios Kyrtzidis } 2076bcb48dc67e417e0ecce803f28d13bbea2ee0243Argyrios Kyrtzidis}; 2086bcb48dc67e417e0ecce803f28d13bbea2ee0243Argyrios Kyrtzidis 20957300760964904cc022a175643342f29f46b7e6bAnna Zaks/// \brief A helper class which wraps a boolean value set to false by default. 21057300760964904cc022a175643342f29f46b7e6bAnna Zaksstruct DefaultBool { 21157300760964904cc022a175643342f29f46b7e6bAnna Zaks bool Val; 21257300760964904cc022a175643342f29f46b7e6bAnna Zaks DefaultBool() : Val(false) {} 21357300760964904cc022a175643342f29f46b7e6bAnna Zaks operator bool() const { return Val; } 21457300760964904cc022a175643342f29f46b7e6bAnna Zaks DefaultBool &operator=(bool b) { Val = b; return *this; } 21557300760964904cc022a175643342f29f46b7e6bAnna Zaks}; 21657300760964904cc022a175643342f29f46b7e6bAnna Zaks 2176bcb48dc67e417e0ecce803f28d13bbea2ee0243Argyrios Kyrtzidis} // end GR namespace 2186bcb48dc67e417e0ecce803f28d13bbea2ee0243Argyrios Kyrtzidis 2196bcb48dc67e417e0ecce803f28d13bbea2ee0243Argyrios Kyrtzidis} // end clang namespace 2206bcb48dc67e417e0ecce803f28d13bbea2ee0243Argyrios Kyrtzidis 2216bcb48dc67e417e0ecce803f28d13bbea2ee0243Argyrios Kyrtzidis#endif 222