DeLesley Hutchins | df7bef0 | 2013-08-12 21:20:55 +0000 | [diff] [blame] | 1 | //===- Consumed.cpp --------------------------------------------*- C++ --*-===// |
| 2 | // |
| 3 | // The LLVM Compiler Infrastructure |
| 4 | // |
| 5 | // This file is distributed under the University of Illinois Open Source |
| 6 | // License. See LICENSE.TXT for details. |
| 7 | // |
| 8 | //===----------------------------------------------------------------------===// |
| 9 | // |
| 10 | // A intra-procedural analysis for checking consumed properties. This is based, |
| 11 | // in part, on research on linear types. |
| 12 | // |
| 13 | //===----------------------------------------------------------------------===// |
| 14 | |
| 15 | #include "clang/AST/ASTContext.h" |
| 16 | #include "clang/AST/Attr.h" |
| 17 | #include "clang/AST/DeclCXX.h" |
| 18 | #include "clang/AST/ExprCXX.h" |
| 19 | #include "clang/AST/RecursiveASTVisitor.h" |
| 20 | #include "clang/AST/StmtVisitor.h" |
| 21 | #include "clang/AST/StmtCXX.h" |
| 22 | #include "clang/AST/Type.h" |
| 23 | #include "clang/Analysis/Analyses/PostOrderCFGView.h" |
| 24 | #include "clang/Analysis/AnalysisContext.h" |
| 25 | #include "clang/Analysis/CFG.h" |
| 26 | #include "clang/Analysis/Analyses/Consumed.h" |
| 27 | #include "clang/Basic/OperatorKinds.h" |
| 28 | #include "clang/Basic/SourceLocation.h" |
DeLesley Hutchins | df7bef0 | 2013-08-12 21:20:55 +0000 | [diff] [blame] | 29 | #include "llvm/ADT/DenseMap.h" |
| 30 | #include "llvm/ADT/SmallVector.h" |
DeLesley Hutchins | b7dc1f5 | 2013-08-29 17:26:57 +0000 | [diff] [blame] | 31 | #include "llvm/Support/Compiler.h" |
DeLesley Hutchins | df7bef0 | 2013-08-12 21:20:55 +0000 | [diff] [blame] | 32 | #include "llvm/Support/raw_ostream.h" |
| 33 | |
DeLesley Hutchins | 0e8534e | 2013-09-03 20:11:38 +0000 | [diff] [blame] | 34 | // TODO: Add notes about the actual and expected state for |
DeLesley Hutchins | b7dc1f5 | 2013-08-29 17:26:57 +0000 | [diff] [blame] | 35 | // TODO: Correctly identify unreachable blocks when chaining boolean operators. |
| 36 | // TODO: Warn about unreachable code. |
| 37 | // TODO: Switch to using a bitmap to track unreachable blocks. |
DeLesley Hutchins | df7bef0 | 2013-08-12 21:20:55 +0000 | [diff] [blame] | 38 | // TODO: Mark variables as Unknown going into while- or for-loops only if they |
| 39 | // are referenced inside that block. (Deferred) |
DeLesley Hutchins | b7dc1f5 | 2013-08-29 17:26:57 +0000 | [diff] [blame] | 40 | // TODO: Handle variable definitions, e.g. bool valid = x.isValid(); |
| 41 | // if (valid) ...; (Deferred) |
DeLesley Hutchins | df7bef0 | 2013-08-12 21:20:55 +0000 | [diff] [blame] | 42 | // TODO: Add a method(s) to identify which method calls perform what state |
| 43 | // transitions. (Deferred) |
| 44 | // TODO: Take notes on state transitions to provide better warning messages. |
| 45 | // (Deferred) |
| 46 | // TODO: Test nested conditionals: A) Checking the same value multiple times, |
| 47 | // and 2) Checking different values. (Deferred) |
DeLesley Hutchins | df7bef0 | 2013-08-12 21:20:55 +0000 | [diff] [blame] | 48 | |
| 49 | using namespace clang; |
| 50 | using namespace consumed; |
| 51 | |
| 52 | // Key method definition |
| 53 | ConsumedWarningsHandlerBase::~ConsumedWarningsHandlerBase() {} |
| 54 | |
DeLesley Hutchins | b7dc1f5 | 2013-08-29 17:26:57 +0000 | [diff] [blame] | 55 | static ConsumedState invertConsumedUnconsumed(ConsumedState State) { |
| 56 | switch (State) { |
| 57 | case CS_Unconsumed: |
| 58 | return CS_Consumed; |
| 59 | case CS_Consumed: |
| 60 | return CS_Unconsumed; |
| 61 | case CS_None: |
| 62 | return CS_None; |
| 63 | case CS_Unknown: |
| 64 | return CS_Unknown; |
| 65 | } |
| 66 | llvm_unreachable("invalid enum"); |
| 67 | } |
| 68 | |
DeLesley Hutchins | c55bee6 | 2013-08-30 22:56:34 +0000 | [diff] [blame] | 69 | static bool isConsumableType(const QualType &QT) { |
| 70 | if (const CXXRecordDecl *RD = QT->getAsCXXRecordDecl()) |
| 71 | return RD->hasAttr<ConsumableAttr>(); |
| 72 | else |
| 73 | return false; |
| 74 | } |
| 75 | |
DeLesley Hutchins | b7dc1f5 | 2013-08-29 17:26:57 +0000 | [diff] [blame] | 76 | static bool isKnownState(ConsumedState State) { |
| 77 | switch (State) { |
| 78 | case CS_Unconsumed: |
| 79 | case CS_Consumed: |
| 80 | return true; |
| 81 | case CS_None: |
| 82 | case CS_Unknown: |
| 83 | return false; |
| 84 | } |
Aaron Ballman | 6b2ec03 | 2013-08-29 20:36:09 +0000 | [diff] [blame] | 85 | llvm_unreachable("invalid enum"); |
DeLesley Hutchins | b7dc1f5 | 2013-08-29 17:26:57 +0000 | [diff] [blame] | 86 | } |
| 87 | |
DeLesley Hutchins | 5fdd207 | 2013-08-22 20:44:47 +0000 | [diff] [blame] | 88 | static bool isTestingFunction(const FunctionDecl *FunDecl) { |
| 89 | return FunDecl->hasAttr<TestsUnconsumedAttr>(); |
| 90 | } |
| 91 | |
David Blaikie | a33ab60 | 2013-09-06 01:28:43 +0000 | [diff] [blame^] | 92 | static ConsumedState mapConsumableAttrState(const QualType QT) { |
| 93 | assert(isConsumableType(QT)); |
| 94 | |
| 95 | const ConsumableAttr *CAttr = |
| 96 | QT->getAsCXXRecordDecl()->getAttr<ConsumableAttr>(); |
| 97 | |
| 98 | switch (CAttr->getDefaultState()) { |
| 99 | case ConsumableAttr::Unknown: |
| 100 | return CS_Unknown; |
| 101 | case ConsumableAttr::Unconsumed: |
| 102 | return CS_Unconsumed; |
| 103 | case ConsumableAttr::Consumed: |
| 104 | return CS_Consumed; |
| 105 | } |
| 106 | llvm_unreachable("invalid enum"); |
| 107 | } |
| 108 | |
Eric Christopher | e988dc4 | 2013-09-03 20:43:00 +0000 | [diff] [blame] | 109 | static ConsumedState |
| 110 | mapReturnTypestateAttrState(const ReturnTypestateAttr *RTSAttr) { |
DeLesley Hutchins | 0e8534e | 2013-09-03 20:11:38 +0000 | [diff] [blame] | 111 | switch (RTSAttr->getState()) { |
| 112 | case ReturnTypestateAttr::Unknown: |
| 113 | return CS_Unknown; |
| 114 | case ReturnTypestateAttr::Unconsumed: |
| 115 | return CS_Unconsumed; |
| 116 | case ReturnTypestateAttr::Consumed: |
| 117 | return CS_Consumed; |
| 118 | } |
Eric Christopher | e988dc4 | 2013-09-03 20:43:00 +0000 | [diff] [blame] | 119 | llvm_unreachable("invalid enum"); |
DeLesley Hutchins | 0e8534e | 2013-09-03 20:11:38 +0000 | [diff] [blame] | 120 | } |
| 121 | |
DeLesley Hutchins | df7bef0 | 2013-08-12 21:20:55 +0000 | [diff] [blame] | 122 | static StringRef stateToString(ConsumedState State) { |
| 123 | switch (State) { |
| 124 | case consumed::CS_None: |
| 125 | return "none"; |
| 126 | |
| 127 | case consumed::CS_Unknown: |
| 128 | return "unknown"; |
| 129 | |
| 130 | case consumed::CS_Unconsumed: |
| 131 | return "unconsumed"; |
| 132 | |
| 133 | case consumed::CS_Consumed: |
| 134 | return "consumed"; |
| 135 | } |
Reid Kleckner | a72f720 | 2013-08-13 00:11:59 +0000 | [diff] [blame] | 136 | llvm_unreachable("invalid enum"); |
DeLesley Hutchins | df7bef0 | 2013-08-12 21:20:55 +0000 | [diff] [blame] | 137 | } |
| 138 | |
| 139 | namespace { |
DeLesley Hutchins | b7dc1f5 | 2013-08-29 17:26:57 +0000 | [diff] [blame] | 140 | struct VarTestResult { |
| 141 | const VarDecl *Var; |
| 142 | ConsumedState TestsFor; |
| 143 | }; |
| 144 | } // end anonymous::VarTestResult |
| 145 | |
| 146 | namespace clang { |
| 147 | namespace consumed { |
| 148 | |
| 149 | enum EffectiveOp { |
| 150 | EO_And, |
| 151 | EO_Or |
| 152 | }; |
| 153 | |
| 154 | class PropagationInfo { |
| 155 | enum { |
| 156 | IT_None, |
| 157 | IT_State, |
| 158 | IT_Test, |
| 159 | IT_BinTest, |
| 160 | IT_Var |
| 161 | } InfoType; |
Eric Christopher | e444ea0 | 2013-08-29 18:00:58 +0000 | [diff] [blame] | 162 | |
| 163 | struct BinTestTy { |
| 164 | const BinaryOperator *Source; |
| 165 | EffectiveOp EOp; |
| 166 | VarTestResult LTest; |
| 167 | VarTestResult RTest; |
| 168 | }; |
DeLesley Hutchins | df7bef0 | 2013-08-12 21:20:55 +0000 | [diff] [blame] | 169 | |
DeLesley Hutchins | b7dc1f5 | 2013-08-29 17:26:57 +0000 | [diff] [blame] | 170 | union { |
DeLesley Hutchins | df7bef0 | 2013-08-12 21:20:55 +0000 | [diff] [blame] | 171 | ConsumedState State; |
DeLesley Hutchins | b7dc1f5 | 2013-08-29 17:26:57 +0000 | [diff] [blame] | 172 | VarTestResult Test; |
DeLesley Hutchins | df7bef0 | 2013-08-12 21:20:55 +0000 | [diff] [blame] | 173 | const VarDecl *Var; |
Eric Christopher | e444ea0 | 2013-08-29 18:00:58 +0000 | [diff] [blame] | 174 | BinTestTy BinTest; |
DeLesley Hutchins | df7bef0 | 2013-08-12 21:20:55 +0000 | [diff] [blame] | 175 | }; |
| 176 | |
DeLesley Hutchins | b7dc1f5 | 2013-08-29 17:26:57 +0000 | [diff] [blame] | 177 | public: |
| 178 | PropagationInfo() : InfoType(IT_None) {} |
DeLesley Hutchins | df7bef0 | 2013-08-12 21:20:55 +0000 | [diff] [blame] | 179 | |
DeLesley Hutchins | b7dc1f5 | 2013-08-29 17:26:57 +0000 | [diff] [blame] | 180 | PropagationInfo(const VarTestResult &Test) : InfoType(IT_Test), Test(Test) {} |
| 181 | PropagationInfo(const VarDecl *Var, ConsumedState TestsFor) |
| 182 | : InfoType(IT_Test) { |
DeLesley Hutchins | df7bef0 | 2013-08-12 21:20:55 +0000 | [diff] [blame] | 183 | |
DeLesley Hutchins | b7dc1f5 | 2013-08-29 17:26:57 +0000 | [diff] [blame] | 184 | Test.Var = Var; |
| 185 | Test.TestsFor = TestsFor; |
| 186 | } |
| 187 | |
| 188 | PropagationInfo(const BinaryOperator *Source, EffectiveOp EOp, |
| 189 | const VarTestResult <est, const VarTestResult &RTest) |
| 190 | : InfoType(IT_BinTest) { |
| 191 | |
| 192 | BinTest.Source = Source; |
| 193 | BinTest.EOp = EOp; |
| 194 | BinTest.LTest = LTest; |
| 195 | BinTest.RTest = RTest; |
| 196 | } |
| 197 | |
| 198 | PropagationInfo(const BinaryOperator *Source, EffectiveOp EOp, |
| 199 | const VarDecl *LVar, ConsumedState LTestsFor, |
| 200 | const VarDecl *RVar, ConsumedState RTestsFor) |
| 201 | : InfoType(IT_BinTest) { |
| 202 | |
| 203 | BinTest.Source = Source; |
| 204 | BinTest.EOp = EOp; |
| 205 | BinTest.LTest.Var = LVar; |
| 206 | BinTest.LTest.TestsFor = LTestsFor; |
| 207 | BinTest.RTest.Var = RVar; |
| 208 | BinTest.RTest.TestsFor = RTestsFor; |
| 209 | } |
| 210 | |
| 211 | PropagationInfo(ConsumedState State) : InfoType(IT_State), State(State) {} |
| 212 | PropagationInfo(const VarDecl *Var) : InfoType(IT_Var), Var(Var) {} |
| 213 | |
| 214 | const ConsumedState & getState() const { |
| 215 | assert(InfoType == IT_State); |
| 216 | return State; |
| 217 | } |
| 218 | |
| 219 | const VarTestResult & getTest() const { |
| 220 | assert(InfoType == IT_Test); |
| 221 | return Test; |
| 222 | } |
| 223 | |
| 224 | const VarTestResult & getLTest() const { |
| 225 | assert(InfoType == IT_BinTest); |
| 226 | return BinTest.LTest; |
| 227 | } |
| 228 | |
| 229 | const VarTestResult & getRTest() const { |
| 230 | assert(InfoType == IT_BinTest); |
| 231 | return BinTest.RTest; |
| 232 | } |
| 233 | |
| 234 | const VarDecl * getVar() const { |
| 235 | assert(InfoType == IT_Var); |
| 236 | return Var; |
| 237 | } |
| 238 | |
| 239 | EffectiveOp testEffectiveOp() const { |
| 240 | assert(InfoType == IT_BinTest); |
| 241 | return BinTest.EOp; |
| 242 | } |
| 243 | |
| 244 | const BinaryOperator * testSourceNode() const { |
| 245 | assert(InfoType == IT_BinTest); |
| 246 | return BinTest.Source; |
| 247 | } |
| 248 | |
| 249 | bool isValid() const { return InfoType != IT_None; } |
| 250 | bool isState() const { return InfoType == IT_State; } |
| 251 | bool isTest() const { return InfoType == IT_Test; } |
| 252 | bool isBinTest() const { return InfoType == IT_BinTest; } |
| 253 | bool isVar() const { return InfoType == IT_Var; } |
| 254 | |
| 255 | PropagationInfo invertTest() const { |
| 256 | assert(InfoType == IT_Test || InfoType == IT_BinTest); |
| 257 | |
| 258 | if (InfoType == IT_Test) { |
| 259 | return PropagationInfo(Test.Var, invertConsumedUnconsumed(Test.TestsFor)); |
| 260 | |
| 261 | } else if (InfoType == IT_BinTest) { |
| 262 | return PropagationInfo(BinTest.Source, |
| 263 | BinTest.EOp == EO_And ? EO_Or : EO_And, |
| 264 | BinTest.LTest.Var, invertConsumedUnconsumed(BinTest.LTest.TestsFor), |
| 265 | BinTest.RTest.Var, invertConsumedUnconsumed(BinTest.RTest.TestsFor)); |
| 266 | } else { |
| 267 | return PropagationInfo(); |
DeLesley Hutchins | df7bef0 | 2013-08-12 21:20:55 +0000 | [diff] [blame] | 268 | } |
DeLesley Hutchins | b7dc1f5 | 2013-08-29 17:26:57 +0000 | [diff] [blame] | 269 | } |
| 270 | }; |
| 271 | |
| 272 | class ConsumedStmtVisitor : public ConstStmtVisitor<ConsumedStmtVisitor> { |
DeLesley Hutchins | df7bef0 | 2013-08-12 21:20:55 +0000 | [diff] [blame] | 273 | |
| 274 | typedef llvm::DenseMap<const Stmt *, PropagationInfo> MapType; |
| 275 | typedef std::pair<const Stmt *, PropagationInfo> PairType; |
| 276 | typedef MapType::iterator InfoEntry; |
DeLesley Hutchins | b7dc1f5 | 2013-08-29 17:26:57 +0000 | [diff] [blame] | 277 | typedef MapType::const_iterator ConstInfoEntry; |
| 278 | |
Reid Kleckner | 2d84f6b | 2013-08-12 23:49:39 +0000 | [diff] [blame] | 279 | AnalysisDeclContext &AC; |
DeLesley Hutchins | df7bef0 | 2013-08-12 21:20:55 +0000 | [diff] [blame] | 280 | ConsumedAnalyzer &Analyzer; |
| 281 | ConsumedStateMap *StateMap; |
| 282 | MapType PropagationMap; |
| 283 | |
DeLesley Hutchins | b01e2da | 2013-08-26 20:34:59 +0000 | [diff] [blame] | 284 | void checkCallability(const PropagationInfo &PInfo, |
DeLesley Hutchins | 5fdd207 | 2013-08-22 20:44:47 +0000 | [diff] [blame] | 285 | const FunctionDecl *FunDecl, |
| 286 | const CallExpr *Call); |
DeLesley Hutchins | df7bef0 | 2013-08-12 21:20:55 +0000 | [diff] [blame] | 287 | void forwardInfo(const Stmt *From, const Stmt *To); |
DeLesley Hutchins | b7dc1f5 | 2013-08-29 17:26:57 +0000 | [diff] [blame] | 288 | void handleTestingFunctionCall(const CallExpr *Call, const VarDecl *Var); |
DeLesley Hutchins | df7bef0 | 2013-08-12 21:20:55 +0000 | [diff] [blame] | 289 | bool isLikeMoveAssignment(const CXXMethodDecl *MethodDecl); |
DeLesley Hutchins | 0e8534e | 2013-09-03 20:11:38 +0000 | [diff] [blame] | 290 | void propagateReturnType(const Stmt *Call, const FunctionDecl *Fun, |
| 291 | QualType ReturnType); |
DeLesley Hutchins | df7bef0 | 2013-08-12 21:20:55 +0000 | [diff] [blame] | 292 | |
| 293 | public: |
DeLesley Hutchins | b7dc1f5 | 2013-08-29 17:26:57 +0000 | [diff] [blame] | 294 | |
DeLesley Hutchins | df7bef0 | 2013-08-12 21:20:55 +0000 | [diff] [blame] | 295 | void Visit(const Stmt *StmtNode); |
| 296 | |
| 297 | void VisitBinaryOperator(const BinaryOperator *BinOp); |
| 298 | void VisitCallExpr(const CallExpr *Call); |
| 299 | void VisitCastExpr(const CastExpr *Cast); |
| 300 | void VisitCXXConstructExpr(const CXXConstructExpr *Call); |
| 301 | void VisitCXXMemberCallExpr(const CXXMemberCallExpr *Call); |
| 302 | void VisitCXXOperatorCallExpr(const CXXOperatorCallExpr *Call); |
| 303 | void VisitDeclRefExpr(const DeclRefExpr *DeclRef); |
| 304 | void VisitDeclStmt(const DeclStmt *DelcS); |
| 305 | void VisitMaterializeTemporaryExpr(const MaterializeTemporaryExpr *Temp); |
| 306 | void VisitMemberExpr(const MemberExpr *MExpr); |
DeLesley Hutchins | 4252598 | 2013-08-29 22:36:05 +0000 | [diff] [blame] | 307 | void VisitParmVarDecl(const ParmVarDecl *Param); |
DeLesley Hutchins | 0e8534e | 2013-09-03 20:11:38 +0000 | [diff] [blame] | 308 | void VisitReturnStmt(const ReturnStmt *Ret); |
DeLesley Hutchins | df7bef0 | 2013-08-12 21:20:55 +0000 | [diff] [blame] | 309 | void VisitUnaryOperator(const UnaryOperator *UOp); |
| 310 | void VisitVarDecl(const VarDecl *Var); |
Reid Kleckner | 2d84f6b | 2013-08-12 23:49:39 +0000 | [diff] [blame] | 311 | |
DeLesley Hutchins | 4252598 | 2013-08-29 22:36:05 +0000 | [diff] [blame] | 312 | ConsumedStmtVisitor(AnalysisDeclContext &AC, ConsumedAnalyzer &Analyzer, |
| 313 | ConsumedStateMap *StateMap) |
| 314 | : AC(AC), Analyzer(Analyzer), StateMap(StateMap) {} |
DeLesley Hutchins | b7dc1f5 | 2013-08-29 17:26:57 +0000 | [diff] [blame] | 315 | |
| 316 | PropagationInfo getInfo(const Stmt *StmtNode) const { |
| 317 | ConstInfoEntry Entry = PropagationMap.find(StmtNode); |
| 318 | |
| 319 | if (Entry != PropagationMap.end()) |
| 320 | return Entry->second; |
| 321 | else |
| 322 | return PropagationInfo(); |
| 323 | } |
| 324 | |
| 325 | void reset(ConsumedStateMap *NewStateMap) { |
| 326 | StateMap = NewStateMap; |
DeLesley Hutchins | df7bef0 | 2013-08-12 21:20:55 +0000 | [diff] [blame] | 327 | } |
| 328 | }; |
| 329 | |
DeLesley Hutchins | 5fdd207 | 2013-08-22 20:44:47 +0000 | [diff] [blame] | 330 | // TODO: When we support CallableWhenConsumed this will have to check for |
| 331 | // the different attributes and change the behavior bellow. (Deferred) |
DeLesley Hutchins | b01e2da | 2013-08-26 20:34:59 +0000 | [diff] [blame] | 332 | void ConsumedStmtVisitor::checkCallability(const PropagationInfo &PInfo, |
DeLesley Hutchins | 5fdd207 | 2013-08-22 20:44:47 +0000 | [diff] [blame] | 333 | const FunctionDecl *FunDecl, |
| 334 | const CallExpr *Call) { |
| 335 | |
| 336 | if (!FunDecl->hasAttr<CallableWhenUnconsumedAttr>()) return; |
| 337 | |
DeLesley Hutchins | b7dc1f5 | 2013-08-29 17:26:57 +0000 | [diff] [blame] | 338 | if (PInfo.isVar()) { |
DeLesley Hutchins | b01e2da | 2013-08-26 20:34:59 +0000 | [diff] [blame] | 339 | const VarDecl *Var = PInfo.getVar(); |
DeLesley Hutchins | 5fdd207 | 2013-08-22 20:44:47 +0000 | [diff] [blame] | 340 | |
| 341 | switch (StateMap->getState(Var)) { |
| 342 | case CS_Consumed: |
| 343 | Analyzer.WarningsHandler.warnUseWhileConsumed( |
| 344 | FunDecl->getNameAsString(), Var->getNameAsString(), |
| 345 | Call->getExprLoc()); |
| 346 | break; |
| 347 | |
| 348 | case CS_Unknown: |
| 349 | Analyzer.WarningsHandler.warnUseInUnknownState( |
| 350 | FunDecl->getNameAsString(), Var->getNameAsString(), |
| 351 | Call->getExprLoc()); |
| 352 | break; |
| 353 | |
| 354 | case CS_None: |
| 355 | case CS_Unconsumed: |
| 356 | break; |
| 357 | } |
| 358 | |
| 359 | } else { |
DeLesley Hutchins | b01e2da | 2013-08-26 20:34:59 +0000 | [diff] [blame] | 360 | switch (PInfo.getState()) { |
DeLesley Hutchins | 5fdd207 | 2013-08-22 20:44:47 +0000 | [diff] [blame] | 361 | case CS_Consumed: |
| 362 | Analyzer.WarningsHandler.warnUseOfTempWhileConsumed( |
| 363 | FunDecl->getNameAsString(), Call->getExprLoc()); |
| 364 | break; |
| 365 | |
| 366 | case CS_Unknown: |
| 367 | Analyzer.WarningsHandler.warnUseOfTempInUnknownState( |
| 368 | FunDecl->getNameAsString(), Call->getExprLoc()); |
| 369 | break; |
| 370 | |
| 371 | case CS_None: |
| 372 | case CS_Unconsumed: |
| 373 | break; |
| 374 | } |
| 375 | } |
| 376 | } |
| 377 | |
DeLesley Hutchins | df7bef0 | 2013-08-12 21:20:55 +0000 | [diff] [blame] | 378 | void ConsumedStmtVisitor::forwardInfo(const Stmt *From, const Stmt *To) { |
| 379 | InfoEntry Entry = PropagationMap.find(From); |
| 380 | |
DeLesley Hutchins | b7dc1f5 | 2013-08-29 17:26:57 +0000 | [diff] [blame] | 381 | if (Entry != PropagationMap.end()) |
| 382 | PropagationMap.insert(PairType(To, Entry->second)); |
| 383 | } |
| 384 | |
| 385 | void ConsumedStmtVisitor::handleTestingFunctionCall(const CallExpr *Call, |
| 386 | const VarDecl *Var) { |
| 387 | |
| 388 | ConsumedState VarState = StateMap->getState(Var); |
| 389 | |
| 390 | if (VarState != CS_Unknown) { |
| 391 | SourceLocation CallLoc = Call->getExprLoc(); |
| 392 | |
| 393 | if (!CallLoc.isMacroID()) |
| 394 | Analyzer.WarningsHandler.warnUnnecessaryTest(Var->getNameAsString(), |
| 395 | stateToString(VarState), CallLoc); |
DeLesley Hutchins | df7bef0 | 2013-08-12 21:20:55 +0000 | [diff] [blame] | 396 | } |
DeLesley Hutchins | b7dc1f5 | 2013-08-29 17:26:57 +0000 | [diff] [blame] | 397 | |
| 398 | PropagationMap.insert(PairType(Call, PropagationInfo(Var, CS_Unconsumed))); |
DeLesley Hutchins | df7bef0 | 2013-08-12 21:20:55 +0000 | [diff] [blame] | 399 | } |
| 400 | |
| 401 | bool ConsumedStmtVisitor::isLikeMoveAssignment( |
| 402 | const CXXMethodDecl *MethodDecl) { |
| 403 | |
| 404 | return MethodDecl->isMoveAssignmentOperator() || |
| 405 | (MethodDecl->getOverloadedOperator() == OO_Equal && |
| 406 | MethodDecl->getNumParams() == 1 && |
| 407 | MethodDecl->getParamDecl(0)->getType()->isRValueReferenceType()); |
| 408 | } |
| 409 | |
DeLesley Hutchins | 0e8534e | 2013-09-03 20:11:38 +0000 | [diff] [blame] | 410 | void ConsumedStmtVisitor::propagateReturnType(const Stmt *Call, |
| 411 | const FunctionDecl *Fun, |
| 412 | QualType ReturnType) { |
| 413 | if (isConsumableType(ReturnType)) { |
| 414 | |
| 415 | ConsumedState ReturnState; |
| 416 | |
| 417 | if (Fun->hasAttr<ReturnTypestateAttr>()) |
| 418 | ReturnState = mapReturnTypestateAttrState( |
| 419 | Fun->getAttr<ReturnTypestateAttr>()); |
| 420 | else |
David Blaikie | a33ab60 | 2013-09-06 01:28:43 +0000 | [diff] [blame^] | 421 | ReturnState = mapConsumableAttrState(ReturnType); |
DeLesley Hutchins | 0e8534e | 2013-09-03 20:11:38 +0000 | [diff] [blame] | 422 | |
| 423 | PropagationMap.insert(PairType(Call, |
| 424 | PropagationInfo(ReturnState))); |
| 425 | } |
| 426 | } |
| 427 | |
DeLesley Hutchins | b7dc1f5 | 2013-08-29 17:26:57 +0000 | [diff] [blame] | 428 | void ConsumedStmtVisitor::Visit(const Stmt *StmtNode) { |
| 429 | |
| 430 | ConstStmtVisitor<ConsumedStmtVisitor>::Visit(StmtNode); |
| 431 | |
| 432 | for (Stmt::const_child_iterator CI = StmtNode->child_begin(), |
| 433 | CE = StmtNode->child_end(); CI != CE; ++CI) { |
| 434 | |
| 435 | PropagationMap.erase(*CI); |
| 436 | } |
| 437 | } |
| 438 | |
DeLesley Hutchins | df7bef0 | 2013-08-12 21:20:55 +0000 | [diff] [blame] | 439 | void ConsumedStmtVisitor::VisitBinaryOperator(const BinaryOperator *BinOp) { |
| 440 | switch (BinOp->getOpcode()) { |
DeLesley Hutchins | b7dc1f5 | 2013-08-29 17:26:57 +0000 | [diff] [blame] | 441 | case BO_LAnd: |
| 442 | case BO_LOr : { |
| 443 | InfoEntry LEntry = PropagationMap.find(BinOp->getLHS()), |
| 444 | REntry = PropagationMap.find(BinOp->getRHS()); |
| 445 | |
| 446 | VarTestResult LTest, RTest; |
| 447 | |
| 448 | if (LEntry != PropagationMap.end() && LEntry->second.isTest()) { |
| 449 | LTest = LEntry->second.getTest(); |
| 450 | |
| 451 | } else { |
| 452 | LTest.Var = NULL; |
| 453 | LTest.TestsFor = CS_None; |
| 454 | } |
| 455 | |
| 456 | if (REntry != PropagationMap.end() && REntry->second.isTest()) { |
| 457 | RTest = REntry->second.getTest(); |
| 458 | |
| 459 | } else { |
| 460 | RTest.Var = NULL; |
| 461 | RTest.TestsFor = CS_None; |
| 462 | } |
| 463 | |
| 464 | if (!(LTest.Var == NULL && RTest.Var == NULL)) |
| 465 | PropagationMap.insert(PairType(BinOp, PropagationInfo(BinOp, |
| 466 | static_cast<EffectiveOp>(BinOp->getOpcode() == BO_LOr), LTest, RTest))); |
| 467 | |
| 468 | break; |
| 469 | } |
| 470 | |
DeLesley Hutchins | df7bef0 | 2013-08-12 21:20:55 +0000 | [diff] [blame] | 471 | case BO_PtrMemD: |
| 472 | case BO_PtrMemI: |
| 473 | forwardInfo(BinOp->getLHS(), BinOp); |
| 474 | break; |
| 475 | |
| 476 | default: |
| 477 | break; |
| 478 | } |
| 479 | } |
| 480 | |
DeLesley Hutchins | df7bef0 | 2013-08-12 21:20:55 +0000 | [diff] [blame] | 481 | void ConsumedStmtVisitor::VisitCallExpr(const CallExpr *Call) { |
| 482 | if (const FunctionDecl *FunDecl = |
| 483 | dyn_cast_or_null<FunctionDecl>(Call->getDirectCallee())) { |
| 484 | |
| 485 | // Special case for the std::move function. |
| 486 | // TODO: Make this more specific. (Deferred) |
| 487 | if (FunDecl->getNameAsString() == "move") { |
| 488 | InfoEntry Entry = PropagationMap.find(Call->getArg(0)); |
| 489 | |
| 490 | if (Entry != PropagationMap.end()) { |
| 491 | PropagationMap.insert(PairType(Call, Entry->second)); |
| 492 | } |
| 493 | |
| 494 | return; |
| 495 | } |
| 496 | |
| 497 | unsigned Offset = Call->getNumArgs() - FunDecl->getNumParams(); |
| 498 | |
| 499 | for (unsigned Index = Offset; Index < Call->getNumArgs(); ++Index) { |
| 500 | QualType ParamType = FunDecl->getParamDecl(Index - Offset)->getType(); |
| 501 | |
| 502 | InfoEntry Entry = PropagationMap.find(Call->getArg(Index)); |
| 503 | |
DeLesley Hutchins | b7dc1f5 | 2013-08-29 17:26:57 +0000 | [diff] [blame] | 504 | if (Entry == PropagationMap.end() || !Entry->second.isVar()) { |
DeLesley Hutchins | df7bef0 | 2013-08-12 21:20:55 +0000 | [diff] [blame] | 505 | continue; |
| 506 | } |
| 507 | |
DeLesley Hutchins | b01e2da | 2013-08-26 20:34:59 +0000 | [diff] [blame] | 508 | PropagationInfo PInfo = Entry->second; |
DeLesley Hutchins | df7bef0 | 2013-08-12 21:20:55 +0000 | [diff] [blame] | 509 | |
| 510 | if (ParamType->isRValueReferenceType() || |
| 511 | (ParamType->isLValueReferenceType() && |
| 512 | !cast<LValueReferenceType>(*ParamType).isSpelledAsLValue())) { |
| 513 | |
DeLesley Hutchins | b01e2da | 2013-08-26 20:34:59 +0000 | [diff] [blame] | 514 | StateMap->setState(PInfo.getVar(), consumed::CS_Consumed); |
DeLesley Hutchins | df7bef0 | 2013-08-12 21:20:55 +0000 | [diff] [blame] | 515 | |
| 516 | } else if (!(ParamType.isConstQualified() || |
| 517 | ((ParamType->isReferenceType() || |
| 518 | ParamType->isPointerType()) && |
| 519 | ParamType->getPointeeType().isConstQualified()))) { |
| 520 | |
DeLesley Hutchins | b01e2da | 2013-08-26 20:34:59 +0000 | [diff] [blame] | 521 | StateMap->setState(PInfo.getVar(), consumed::CS_Unknown); |
DeLesley Hutchins | df7bef0 | 2013-08-12 21:20:55 +0000 | [diff] [blame] | 522 | } |
| 523 | } |
DeLesley Hutchins | 0e8534e | 2013-09-03 20:11:38 +0000 | [diff] [blame] | 524 | |
| 525 | propagateReturnType(Call, FunDecl, FunDecl->getCallResultType()); |
DeLesley Hutchins | df7bef0 | 2013-08-12 21:20:55 +0000 | [diff] [blame] | 526 | } |
| 527 | } |
| 528 | |
| 529 | void ConsumedStmtVisitor::VisitCastExpr(const CastExpr *Cast) { |
DeLesley Hutchins | b7dc1f5 | 2013-08-29 17:26:57 +0000 | [diff] [blame] | 530 | forwardInfo(Cast->getSubExpr(), Cast); |
DeLesley Hutchins | df7bef0 | 2013-08-12 21:20:55 +0000 | [diff] [blame] | 531 | } |
| 532 | |
| 533 | void ConsumedStmtVisitor::VisitCXXConstructExpr(const CXXConstructExpr *Call) { |
| 534 | CXXConstructorDecl *Constructor = Call->getConstructor(); |
Reid Kleckner | 2d84f6b | 2013-08-12 23:49:39 +0000 | [diff] [blame] | 535 | |
| 536 | ASTContext &CurrContext = AC.getASTContext(); |
DeLesley Hutchins | df7bef0 | 2013-08-12 21:20:55 +0000 | [diff] [blame] | 537 | QualType ThisType = Constructor->getThisType(CurrContext)->getPointeeType(); |
| 538 | |
DeLesley Hutchins | c55bee6 | 2013-08-30 22:56:34 +0000 | [diff] [blame] | 539 | if (isConsumableType(ThisType)) { |
DeLesley Hutchins | 0e8534e | 2013-09-03 20:11:38 +0000 | [diff] [blame] | 540 | if (Constructor->isDefaultConstructor()) { |
DeLesley Hutchins | df7bef0 | 2013-08-12 21:20:55 +0000 | [diff] [blame] | 541 | |
| 542 | PropagationMap.insert(PairType(Call, |
| 543 | PropagationInfo(consumed::CS_Consumed))); |
| 544 | |
| 545 | } else if (Constructor->isMoveConstructor()) { |
| 546 | |
DeLesley Hutchins | b01e2da | 2013-08-26 20:34:59 +0000 | [diff] [blame] | 547 | PropagationInfo PInfo = |
DeLesley Hutchins | df7bef0 | 2013-08-12 21:20:55 +0000 | [diff] [blame] | 548 | PropagationMap.find(Call->getArg(0))->second; |
| 549 | |
DeLesley Hutchins | b7dc1f5 | 2013-08-29 17:26:57 +0000 | [diff] [blame] | 550 | if (PInfo.isVar()) { |
DeLesley Hutchins | b01e2da | 2013-08-26 20:34:59 +0000 | [diff] [blame] | 551 | const VarDecl* Var = PInfo.getVar(); |
DeLesley Hutchins | df7bef0 | 2013-08-12 21:20:55 +0000 | [diff] [blame] | 552 | |
| 553 | PropagationMap.insert(PairType(Call, |
| 554 | PropagationInfo(StateMap->getState(Var)))); |
| 555 | |
| 556 | StateMap->setState(Var, consumed::CS_Consumed); |
| 557 | |
| 558 | } else { |
DeLesley Hutchins | b01e2da | 2013-08-26 20:34:59 +0000 | [diff] [blame] | 559 | PropagationMap.insert(PairType(Call, PInfo)); |
DeLesley Hutchins | df7bef0 | 2013-08-12 21:20:55 +0000 | [diff] [blame] | 560 | } |
| 561 | |
| 562 | } else if (Constructor->isCopyConstructor()) { |
| 563 | MapType::iterator Entry = PropagationMap.find(Call->getArg(0)); |
| 564 | |
| 565 | if (Entry != PropagationMap.end()) |
| 566 | PropagationMap.insert(PairType(Call, Entry->second)); |
| 567 | |
| 568 | } else { |
DeLesley Hutchins | 0e8534e | 2013-09-03 20:11:38 +0000 | [diff] [blame] | 569 | propagateReturnType(Call, Constructor, ThisType); |
DeLesley Hutchins | df7bef0 | 2013-08-12 21:20:55 +0000 | [diff] [blame] | 570 | } |
| 571 | } |
| 572 | } |
| 573 | |
| 574 | void ConsumedStmtVisitor::VisitCXXMemberCallExpr( |
| 575 | const CXXMemberCallExpr *Call) { |
| 576 | |
| 577 | VisitCallExpr(Call); |
| 578 | |
| 579 | InfoEntry Entry = PropagationMap.find(Call->getCallee()->IgnoreParens()); |
| 580 | |
| 581 | if (Entry != PropagationMap.end()) { |
DeLesley Hutchins | b01e2da | 2013-08-26 20:34:59 +0000 | [diff] [blame] | 582 | PropagationInfo PInfo = Entry->second; |
DeLesley Hutchins | 5fdd207 | 2013-08-22 20:44:47 +0000 | [diff] [blame] | 583 | const CXXMethodDecl *MethodDecl = Call->getMethodDecl(); |
DeLesley Hutchins | df7bef0 | 2013-08-12 21:20:55 +0000 | [diff] [blame] | 584 | |
DeLesley Hutchins | b01e2da | 2013-08-26 20:34:59 +0000 | [diff] [blame] | 585 | checkCallability(PInfo, MethodDecl, Call); |
DeLesley Hutchins | df7bef0 | 2013-08-12 21:20:55 +0000 | [diff] [blame] | 586 | |
DeLesley Hutchins | b7dc1f5 | 2013-08-29 17:26:57 +0000 | [diff] [blame] | 587 | if (PInfo.isVar()) { |
| 588 | if (isTestingFunction(MethodDecl)) |
| 589 | handleTestingFunctionCall(Call, PInfo.getVar()); |
| 590 | else if (MethodDecl->hasAttr<ConsumesAttr>()) |
DeLesley Hutchins | b01e2da | 2013-08-26 20:34:59 +0000 | [diff] [blame] | 591 | StateMap->setState(PInfo.getVar(), consumed::CS_Consumed); |
DeLesley Hutchins | 5fdd207 | 2013-08-22 20:44:47 +0000 | [diff] [blame] | 592 | } |
DeLesley Hutchins | df7bef0 | 2013-08-12 21:20:55 +0000 | [diff] [blame] | 593 | } |
| 594 | } |
| 595 | |
| 596 | void ConsumedStmtVisitor::VisitCXXOperatorCallExpr( |
| 597 | const CXXOperatorCallExpr *Call) { |
| 598 | |
| 599 | const FunctionDecl *FunDecl = |
| 600 | dyn_cast_or_null<FunctionDecl>(Call->getDirectCallee()); |
| 601 | |
| 602 | if (!FunDecl) return; |
| 603 | |
| 604 | if (isa<CXXMethodDecl>(FunDecl) && |
| 605 | isLikeMoveAssignment(cast<CXXMethodDecl>(FunDecl))) { |
| 606 | |
| 607 | InfoEntry LEntry = PropagationMap.find(Call->getArg(0)); |
| 608 | InfoEntry REntry = PropagationMap.find(Call->getArg(1)); |
| 609 | |
DeLesley Hutchins | b01e2da | 2013-08-26 20:34:59 +0000 | [diff] [blame] | 610 | PropagationInfo LPInfo, RPInfo; |
DeLesley Hutchins | df7bef0 | 2013-08-12 21:20:55 +0000 | [diff] [blame] | 611 | |
| 612 | if (LEntry != PropagationMap.end() && |
| 613 | REntry != PropagationMap.end()) { |
| 614 | |
DeLesley Hutchins | b01e2da | 2013-08-26 20:34:59 +0000 | [diff] [blame] | 615 | LPInfo = LEntry->second; |
| 616 | RPInfo = REntry->second; |
DeLesley Hutchins | df7bef0 | 2013-08-12 21:20:55 +0000 | [diff] [blame] | 617 | |
DeLesley Hutchins | b7dc1f5 | 2013-08-29 17:26:57 +0000 | [diff] [blame] | 618 | if (LPInfo.isVar() && RPInfo.isVar()) { |
DeLesley Hutchins | b01e2da | 2013-08-26 20:34:59 +0000 | [diff] [blame] | 619 | StateMap->setState(LPInfo.getVar(), |
| 620 | StateMap->getState(RPInfo.getVar())); |
DeLesley Hutchins | df7bef0 | 2013-08-12 21:20:55 +0000 | [diff] [blame] | 621 | |
DeLesley Hutchins | b01e2da | 2013-08-26 20:34:59 +0000 | [diff] [blame] | 622 | StateMap->setState(RPInfo.getVar(), consumed::CS_Consumed); |
DeLesley Hutchins | df7bef0 | 2013-08-12 21:20:55 +0000 | [diff] [blame] | 623 | |
DeLesley Hutchins | b01e2da | 2013-08-26 20:34:59 +0000 | [diff] [blame] | 624 | PropagationMap.insert(PairType(Call, LPInfo)); |
DeLesley Hutchins | df7bef0 | 2013-08-12 21:20:55 +0000 | [diff] [blame] | 625 | |
DeLesley Hutchins | b7dc1f5 | 2013-08-29 17:26:57 +0000 | [diff] [blame] | 626 | } else if (LPInfo.isVar() && !RPInfo.isVar()) { |
DeLesley Hutchins | b01e2da | 2013-08-26 20:34:59 +0000 | [diff] [blame] | 627 | StateMap->setState(LPInfo.getVar(), RPInfo.getState()); |
DeLesley Hutchins | df7bef0 | 2013-08-12 21:20:55 +0000 | [diff] [blame] | 628 | |
DeLesley Hutchins | b01e2da | 2013-08-26 20:34:59 +0000 | [diff] [blame] | 629 | PropagationMap.insert(PairType(Call, LPInfo)); |
DeLesley Hutchins | df7bef0 | 2013-08-12 21:20:55 +0000 | [diff] [blame] | 630 | |
DeLesley Hutchins | b7dc1f5 | 2013-08-29 17:26:57 +0000 | [diff] [blame] | 631 | } else if (!LPInfo.isVar() && RPInfo.isVar()) { |
DeLesley Hutchins | df7bef0 | 2013-08-12 21:20:55 +0000 | [diff] [blame] | 632 | PropagationMap.insert(PairType(Call, |
DeLesley Hutchins | b01e2da | 2013-08-26 20:34:59 +0000 | [diff] [blame] | 633 | PropagationInfo(StateMap->getState(RPInfo.getVar())))); |
DeLesley Hutchins | df7bef0 | 2013-08-12 21:20:55 +0000 | [diff] [blame] | 634 | |
DeLesley Hutchins | b01e2da | 2013-08-26 20:34:59 +0000 | [diff] [blame] | 635 | StateMap->setState(RPInfo.getVar(), consumed::CS_Consumed); |
DeLesley Hutchins | df7bef0 | 2013-08-12 21:20:55 +0000 | [diff] [blame] | 636 | |
| 637 | } else { |
DeLesley Hutchins | b01e2da | 2013-08-26 20:34:59 +0000 | [diff] [blame] | 638 | PropagationMap.insert(PairType(Call, RPInfo)); |
DeLesley Hutchins | df7bef0 | 2013-08-12 21:20:55 +0000 | [diff] [blame] | 639 | } |
| 640 | |
| 641 | } else if (LEntry != PropagationMap.end() && |
| 642 | REntry == PropagationMap.end()) { |
| 643 | |
DeLesley Hutchins | b01e2da | 2013-08-26 20:34:59 +0000 | [diff] [blame] | 644 | LPInfo = LEntry->second; |
DeLesley Hutchins | df7bef0 | 2013-08-12 21:20:55 +0000 | [diff] [blame] | 645 | |
DeLesley Hutchins | b7dc1f5 | 2013-08-29 17:26:57 +0000 | [diff] [blame] | 646 | if (LPInfo.isVar()) { |
DeLesley Hutchins | b01e2da | 2013-08-26 20:34:59 +0000 | [diff] [blame] | 647 | StateMap->setState(LPInfo.getVar(), consumed::CS_Unknown); |
DeLesley Hutchins | df7bef0 | 2013-08-12 21:20:55 +0000 | [diff] [blame] | 648 | |
DeLesley Hutchins | b01e2da | 2013-08-26 20:34:59 +0000 | [diff] [blame] | 649 | PropagationMap.insert(PairType(Call, LPInfo)); |
DeLesley Hutchins | df7bef0 | 2013-08-12 21:20:55 +0000 | [diff] [blame] | 650 | |
| 651 | } else { |
| 652 | PropagationMap.insert(PairType(Call, |
| 653 | PropagationInfo(consumed::CS_Unknown))); |
| 654 | } |
| 655 | |
| 656 | } else if (LEntry == PropagationMap.end() && |
| 657 | REntry != PropagationMap.end()) { |
| 658 | |
DeLesley Hutchins | b01e2da | 2013-08-26 20:34:59 +0000 | [diff] [blame] | 659 | RPInfo = REntry->second; |
DeLesley Hutchins | df7bef0 | 2013-08-12 21:20:55 +0000 | [diff] [blame] | 660 | |
DeLesley Hutchins | b7dc1f5 | 2013-08-29 17:26:57 +0000 | [diff] [blame] | 661 | if (RPInfo.isVar()) { |
DeLesley Hutchins | b01e2da | 2013-08-26 20:34:59 +0000 | [diff] [blame] | 662 | const VarDecl *Var = RPInfo.getVar(); |
DeLesley Hutchins | df7bef0 | 2013-08-12 21:20:55 +0000 | [diff] [blame] | 663 | |
| 664 | PropagationMap.insert(PairType(Call, |
| 665 | PropagationInfo(StateMap->getState(Var)))); |
| 666 | |
| 667 | StateMap->setState(Var, consumed::CS_Consumed); |
| 668 | |
| 669 | } else { |
DeLesley Hutchins | b01e2da | 2013-08-26 20:34:59 +0000 | [diff] [blame] | 670 | PropagationMap.insert(PairType(Call, RPInfo)); |
DeLesley Hutchins | df7bef0 | 2013-08-12 21:20:55 +0000 | [diff] [blame] | 671 | } |
| 672 | } |
| 673 | |
| 674 | } else { |
| 675 | |
| 676 | VisitCallExpr(Call); |
| 677 | |
| 678 | InfoEntry Entry = PropagationMap.find(Call->getArg(0)); |
| 679 | |
| 680 | if (Entry != PropagationMap.end()) { |
DeLesley Hutchins | b01e2da | 2013-08-26 20:34:59 +0000 | [diff] [blame] | 681 | PropagationInfo PInfo = Entry->second; |
DeLesley Hutchins | df7bef0 | 2013-08-12 21:20:55 +0000 | [diff] [blame] | 682 | |
DeLesley Hutchins | b01e2da | 2013-08-26 20:34:59 +0000 | [diff] [blame] | 683 | checkCallability(PInfo, FunDecl, Call); |
DeLesley Hutchins | df7bef0 | 2013-08-12 21:20:55 +0000 | [diff] [blame] | 684 | |
DeLesley Hutchins | b7dc1f5 | 2013-08-29 17:26:57 +0000 | [diff] [blame] | 685 | if (PInfo.isVar()) { |
DeLesley Hutchins | d324a0b | 2013-08-29 21:17:25 +0000 | [diff] [blame] | 686 | if (isTestingFunction(FunDecl)) |
DeLesley Hutchins | b7dc1f5 | 2013-08-29 17:26:57 +0000 | [diff] [blame] | 687 | handleTestingFunctionCall(Call, PInfo.getVar()); |
DeLesley Hutchins | d324a0b | 2013-08-29 21:17:25 +0000 | [diff] [blame] | 688 | else if (FunDecl->hasAttr<ConsumesAttr>()) |
DeLesley Hutchins | b7dc1f5 | 2013-08-29 17:26:57 +0000 | [diff] [blame] | 689 | StateMap->setState(PInfo.getVar(), consumed::CS_Consumed); |
DeLesley Hutchins | df7bef0 | 2013-08-12 21:20:55 +0000 | [diff] [blame] | 690 | } |
| 691 | } |
| 692 | } |
| 693 | } |
| 694 | |
| 695 | void ConsumedStmtVisitor::VisitDeclRefExpr(const DeclRefExpr *DeclRef) { |
| 696 | if (const VarDecl *Var = dyn_cast_or_null<VarDecl>(DeclRef->getDecl())) |
| 697 | if (StateMap->getState(Var) != consumed::CS_None) |
| 698 | PropagationMap.insert(PairType(DeclRef, PropagationInfo(Var))); |
| 699 | } |
| 700 | |
| 701 | void ConsumedStmtVisitor::VisitDeclStmt(const DeclStmt *DeclS) { |
| 702 | for (DeclStmt::const_decl_iterator DI = DeclS->decl_begin(), |
| 703 | DE = DeclS->decl_end(); DI != DE; ++DI) { |
| 704 | |
| 705 | if (isa<VarDecl>(*DI)) VisitVarDecl(cast<VarDecl>(*DI)); |
| 706 | } |
| 707 | |
| 708 | if (DeclS->isSingleDecl()) |
| 709 | if (const VarDecl *Var = dyn_cast_or_null<VarDecl>(DeclS->getSingleDecl())) |
| 710 | PropagationMap.insert(PairType(DeclS, PropagationInfo(Var))); |
| 711 | } |
| 712 | |
| 713 | void ConsumedStmtVisitor::VisitMaterializeTemporaryExpr( |
| 714 | const MaterializeTemporaryExpr *Temp) { |
| 715 | |
| 716 | InfoEntry Entry = PropagationMap.find(Temp->GetTemporaryExpr()); |
| 717 | |
| 718 | if (Entry != PropagationMap.end()) |
| 719 | PropagationMap.insert(PairType(Temp, Entry->second)); |
| 720 | } |
| 721 | |
| 722 | void ConsumedStmtVisitor::VisitMemberExpr(const MemberExpr *MExpr) { |
| 723 | forwardInfo(MExpr->getBase(), MExpr); |
| 724 | } |
| 725 | |
DeLesley Hutchins | 4252598 | 2013-08-29 22:36:05 +0000 | [diff] [blame] | 726 | |
| 727 | void ConsumedStmtVisitor::VisitParmVarDecl(const ParmVarDecl *Param) { |
David Blaikie | a33ab60 | 2013-09-06 01:28:43 +0000 | [diff] [blame^] | 728 | QualType ParamType = Param->getType(); |
| 729 | ConsumedState ParamState = consumed::CS_None; |
| 730 | |
| 731 | if (!(ParamType->isPointerType() || ParamType->isReferenceType()) && |
| 732 | isConsumableType(ParamType)) |
| 733 | ParamState = mapConsumableAttrState(ParamType); |
| 734 | else if (ParamType->isReferenceType() && |
| 735 | isConsumableType(ParamType->getPointeeType())) |
| 736 | ParamState = consumed::CS_Unknown; |
| 737 | |
| 738 | if (ParamState) |
| 739 | StateMap->setState(Param, ParamState); |
DeLesley Hutchins | 4252598 | 2013-08-29 22:36:05 +0000 | [diff] [blame] | 740 | } |
| 741 | |
DeLesley Hutchins | 0e8534e | 2013-09-03 20:11:38 +0000 | [diff] [blame] | 742 | void ConsumedStmtVisitor::VisitReturnStmt(const ReturnStmt *Ret) { |
| 743 | if (ConsumedState ExpectedState = Analyzer.getExpectedReturnState()) { |
| 744 | InfoEntry Entry = PropagationMap.find(Ret->getRetValue()); |
| 745 | |
| 746 | if (Entry != PropagationMap.end()) { |
| 747 | assert(Entry->second.isState() || Entry->second.isVar()); |
| 748 | |
| 749 | ConsumedState RetState = Entry->second.isState() ? |
| 750 | Entry->second.getState() : StateMap->getState(Entry->second.getVar()); |
| 751 | |
| 752 | if (RetState != ExpectedState) |
| 753 | Analyzer.WarningsHandler.warnReturnTypestateMismatch( |
| 754 | Ret->getReturnLoc(), stateToString(ExpectedState), |
| 755 | stateToString(RetState)); |
| 756 | } |
| 757 | } |
| 758 | } |
| 759 | |
DeLesley Hutchins | df7bef0 | 2013-08-12 21:20:55 +0000 | [diff] [blame] | 760 | void ConsumedStmtVisitor::VisitUnaryOperator(const UnaryOperator *UOp) { |
DeLesley Hutchins | b7dc1f5 | 2013-08-29 17:26:57 +0000 | [diff] [blame] | 761 | InfoEntry Entry = PropagationMap.find(UOp->getSubExpr()->IgnoreParens()); |
| 762 | if (Entry == PropagationMap.end()) return; |
| 763 | |
| 764 | switch (UOp->getOpcode()) { |
| 765 | case UO_AddrOf: |
| 766 | PropagationMap.insert(PairType(UOp, Entry->second)); |
| 767 | break; |
| 768 | |
| 769 | case UO_LNot: |
| 770 | if (Entry->second.isTest() || Entry->second.isBinTest()) |
| 771 | PropagationMap.insert(PairType(UOp, Entry->second.invertTest())); |
| 772 | break; |
| 773 | |
| 774 | default: |
| 775 | break; |
DeLesley Hutchins | df7bef0 | 2013-08-12 21:20:55 +0000 | [diff] [blame] | 776 | } |
| 777 | } |
| 778 | |
| 779 | void ConsumedStmtVisitor::VisitVarDecl(const VarDecl *Var) { |
DeLesley Hutchins | c55bee6 | 2013-08-30 22:56:34 +0000 | [diff] [blame] | 780 | if (isConsumableType(Var->getType())) { |
DeLesley Hutchins | 4252598 | 2013-08-29 22:36:05 +0000 | [diff] [blame] | 781 | if (Var->hasInit()) { |
| 782 | PropagationInfo PInfo = |
| 783 | PropagationMap.find(Var->getInit())->second; |
| 784 | |
| 785 | StateMap->setState(Var, PInfo.isVar() ? |
| 786 | StateMap->getState(PInfo.getVar()) : PInfo.getState()); |
| 787 | |
| 788 | } else { |
| 789 | StateMap->setState(Var, consumed::CS_Unknown); |
| 790 | } |
DeLesley Hutchins | df7bef0 | 2013-08-12 21:20:55 +0000 | [diff] [blame] | 791 | } |
| 792 | } |
DeLesley Hutchins | b7dc1f5 | 2013-08-29 17:26:57 +0000 | [diff] [blame] | 793 | }} // end clang::consumed::ConsumedStmtVisitor |
DeLesley Hutchins | df7bef0 | 2013-08-12 21:20:55 +0000 | [diff] [blame] | 794 | |
| 795 | namespace clang { |
| 796 | namespace consumed { |
| 797 | |
DeLesley Hutchins | b7dc1f5 | 2013-08-29 17:26:57 +0000 | [diff] [blame] | 798 | void splitVarStateForIf(const IfStmt * IfNode, const VarTestResult &Test, |
| 799 | ConsumedStateMap *ThenStates, |
| 800 | ConsumedStateMap *ElseStates) { |
| 801 | |
| 802 | ConsumedState VarState = ThenStates->getState(Test.Var); |
| 803 | |
| 804 | if (VarState == CS_Unknown) { |
| 805 | ThenStates->setState(Test.Var, Test.TestsFor); |
| 806 | if (ElseStates) |
| 807 | ElseStates->setState(Test.Var, invertConsumedUnconsumed(Test.TestsFor)); |
| 808 | |
| 809 | } else if (VarState == invertConsumedUnconsumed(Test.TestsFor)) { |
| 810 | ThenStates->markUnreachable(); |
| 811 | |
| 812 | } else if (VarState == Test.TestsFor && ElseStates) { |
| 813 | ElseStates->markUnreachable(); |
| 814 | } |
| 815 | } |
| 816 | |
| 817 | void splitVarStateForIfBinOp(const PropagationInfo &PInfo, |
| 818 | ConsumedStateMap *ThenStates, ConsumedStateMap *ElseStates) { |
| 819 | |
| 820 | const VarTestResult <est = PInfo.getLTest(), |
| 821 | &RTest = PInfo.getRTest(); |
| 822 | |
| 823 | ConsumedState LState = LTest.Var ? ThenStates->getState(LTest.Var) : CS_None, |
| 824 | RState = RTest.Var ? ThenStates->getState(RTest.Var) : CS_None; |
| 825 | |
| 826 | if (LTest.Var) { |
| 827 | if (PInfo.testEffectiveOp() == EO_And) { |
| 828 | if (LState == CS_Unknown) { |
| 829 | ThenStates->setState(LTest.Var, LTest.TestsFor); |
| 830 | |
| 831 | } else if (LState == invertConsumedUnconsumed(LTest.TestsFor)) { |
| 832 | ThenStates->markUnreachable(); |
| 833 | |
| 834 | } else if (LState == LTest.TestsFor && isKnownState(RState)) { |
| 835 | if (RState == RTest.TestsFor) { |
| 836 | if (ElseStates) |
| 837 | ElseStates->markUnreachable(); |
| 838 | } else { |
| 839 | ThenStates->markUnreachable(); |
| 840 | } |
| 841 | } |
| 842 | |
| 843 | } else { |
| 844 | if (LState == CS_Unknown && ElseStates) { |
| 845 | ElseStates->setState(LTest.Var, |
| 846 | invertConsumedUnconsumed(LTest.TestsFor)); |
| 847 | |
| 848 | } else if (LState == LTest.TestsFor && ElseStates) { |
| 849 | ElseStates->markUnreachable(); |
| 850 | |
| 851 | } else if (LState == invertConsumedUnconsumed(LTest.TestsFor) && |
| 852 | isKnownState(RState)) { |
| 853 | |
| 854 | if (RState == RTest.TestsFor) { |
| 855 | if (ElseStates) |
| 856 | ElseStates->markUnreachable(); |
| 857 | } else { |
| 858 | ThenStates->markUnreachable(); |
| 859 | } |
| 860 | } |
| 861 | } |
| 862 | } |
| 863 | |
| 864 | if (RTest.Var) { |
| 865 | if (PInfo.testEffectiveOp() == EO_And) { |
| 866 | if (RState == CS_Unknown) |
| 867 | ThenStates->setState(RTest.Var, RTest.TestsFor); |
| 868 | else if (RState == invertConsumedUnconsumed(RTest.TestsFor)) |
| 869 | ThenStates->markUnreachable(); |
| 870 | |
| 871 | } else if (ElseStates) { |
| 872 | if (RState == CS_Unknown) |
| 873 | ElseStates->setState(RTest.Var, |
| 874 | invertConsumedUnconsumed(RTest.TestsFor)); |
| 875 | else if (RState == RTest.TestsFor) |
| 876 | ElseStates->markUnreachable(); |
| 877 | } |
| 878 | } |
| 879 | } |
| 880 | |
DeLesley Hutchins | df7bef0 | 2013-08-12 21:20:55 +0000 | [diff] [blame] | 881 | void ConsumedBlockInfo::addInfo(const CFGBlock *Block, |
| 882 | ConsumedStateMap *StateMap, |
| 883 | bool &AlreadyOwned) { |
| 884 | |
| 885 | if (VisitedBlocks.alreadySet(Block)) return; |
| 886 | |
| 887 | ConsumedStateMap *Entry = StateMapsArray[Block->getBlockID()]; |
| 888 | |
| 889 | if (Entry) { |
| 890 | Entry->intersect(StateMap); |
| 891 | |
| 892 | } else if (AlreadyOwned) { |
| 893 | StateMapsArray[Block->getBlockID()] = new ConsumedStateMap(*StateMap); |
| 894 | |
| 895 | } else { |
| 896 | StateMapsArray[Block->getBlockID()] = StateMap; |
| 897 | AlreadyOwned = true; |
| 898 | } |
| 899 | } |
| 900 | |
| 901 | void ConsumedBlockInfo::addInfo(const CFGBlock *Block, |
| 902 | ConsumedStateMap *StateMap) { |
| 903 | |
| 904 | if (VisitedBlocks.alreadySet(Block)) { |
| 905 | delete StateMap; |
| 906 | return; |
| 907 | } |
| 908 | |
| 909 | ConsumedStateMap *Entry = StateMapsArray[Block->getBlockID()]; |
| 910 | |
| 911 | if (Entry) { |
| 912 | Entry->intersect(StateMap); |
| 913 | delete StateMap; |
| 914 | |
| 915 | } else { |
| 916 | StateMapsArray[Block->getBlockID()] = StateMap; |
| 917 | } |
| 918 | } |
| 919 | |
| 920 | ConsumedStateMap* ConsumedBlockInfo::getInfo(const CFGBlock *Block) { |
| 921 | return StateMapsArray[Block->getBlockID()]; |
| 922 | } |
| 923 | |
| 924 | void ConsumedBlockInfo::markVisited(const CFGBlock *Block) { |
| 925 | VisitedBlocks.insert(Block); |
| 926 | } |
| 927 | |
| 928 | ConsumedState ConsumedStateMap::getState(const VarDecl *Var) { |
| 929 | MapType::const_iterator Entry = Map.find(Var); |
| 930 | |
| 931 | if (Entry != Map.end()) { |
| 932 | return Entry->second; |
| 933 | |
| 934 | } else { |
| 935 | return CS_None; |
| 936 | } |
| 937 | } |
| 938 | |
| 939 | void ConsumedStateMap::intersect(const ConsumedStateMap *Other) { |
| 940 | ConsumedState LocalState; |
| 941 | |
DeLesley Hutchins | b7dc1f5 | 2013-08-29 17:26:57 +0000 | [diff] [blame] | 942 | if (this->From && this->From == Other->From && !Other->Reachable) { |
| 943 | this->markUnreachable(); |
| 944 | return; |
| 945 | } |
| 946 | |
DeLesley Hutchins | df7bef0 | 2013-08-12 21:20:55 +0000 | [diff] [blame] | 947 | for (MapType::const_iterator DMI = Other->Map.begin(), |
| 948 | DME = Other->Map.end(); DMI != DME; ++DMI) { |
| 949 | |
| 950 | LocalState = this->getState(DMI->first); |
| 951 | |
DeLesley Hutchins | b7dc1f5 | 2013-08-29 17:26:57 +0000 | [diff] [blame] | 952 | if (LocalState == CS_None) |
| 953 | continue; |
| 954 | |
| 955 | if (LocalState != DMI->second) |
| 956 | Map[DMI->first] = CS_Unknown; |
DeLesley Hutchins | df7bef0 | 2013-08-12 21:20:55 +0000 | [diff] [blame] | 957 | } |
| 958 | } |
| 959 | |
DeLesley Hutchins | b7dc1f5 | 2013-08-29 17:26:57 +0000 | [diff] [blame] | 960 | void ConsumedStateMap::markUnreachable() { |
| 961 | this->Reachable = false; |
| 962 | Map.clear(); |
| 963 | } |
| 964 | |
DeLesley Hutchins | df7bef0 | 2013-08-12 21:20:55 +0000 | [diff] [blame] | 965 | void ConsumedStateMap::makeUnknown() { |
DeLesley Hutchins | df7bef0 | 2013-08-12 21:20:55 +0000 | [diff] [blame] | 966 | for (MapType::const_iterator DMI = Map.begin(), DME = Map.end(); DMI != DME; |
| 967 | ++DMI) { |
| 968 | |
DeLesley Hutchins | b7dc1f5 | 2013-08-29 17:26:57 +0000 | [diff] [blame] | 969 | Map[DMI->first] = CS_Unknown; |
DeLesley Hutchins | df7bef0 | 2013-08-12 21:20:55 +0000 | [diff] [blame] | 970 | } |
| 971 | } |
| 972 | |
| 973 | void ConsumedStateMap::setState(const VarDecl *Var, ConsumedState State) { |
| 974 | Map[Var] = State; |
| 975 | } |
| 976 | |
DeLesley Hutchins | 5fdd207 | 2013-08-22 20:44:47 +0000 | [diff] [blame] | 977 | void ConsumedStateMap::remove(const VarDecl *Var) { |
| 978 | Map.erase(Var); |
| 979 | } |
DeLesley Hutchins | df7bef0 | 2013-08-12 21:20:55 +0000 | [diff] [blame] | 980 | |
David Blaikie | a33ab60 | 2013-09-06 01:28:43 +0000 | [diff] [blame^] | 981 | void ConsumedAnalyzer::determineExpectedReturnState(AnalysisDeclContext &AC, |
| 982 | const FunctionDecl *D) { |
| 983 | QualType ReturnType; |
| 984 | if (const CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(D)) { |
| 985 | ASTContext &CurrContext = AC.getASTContext(); |
| 986 | ReturnType = Constructor->getThisType(CurrContext)->getPointeeType(); |
| 987 | } else |
| 988 | ReturnType = D->getCallResultType(); |
| 989 | |
| 990 | if (D->hasAttr<ReturnTypestateAttr>()) { |
| 991 | const ReturnTypestateAttr *RTSAttr = D->getAttr<ReturnTypestateAttr>(); |
| 992 | |
| 993 | const CXXRecordDecl *RD = ReturnType->getAsCXXRecordDecl(); |
| 994 | if (!RD || !RD->hasAttr<ConsumableAttr>()) { |
| 995 | // FIXME: This should be removed when template instantiation propagates |
| 996 | // attributes at template specialization definition, not |
| 997 | // declaration. When it is removed the test needs to be enabled |
| 998 | // in SemaDeclAttr.cpp. |
| 999 | WarningsHandler.warnReturnTypestateForUnconsumableType( |
| 1000 | RTSAttr->getLocation(), ReturnType.getAsString()); |
| 1001 | ExpectedReturnState = CS_None; |
| 1002 | } else |
| 1003 | ExpectedReturnState = mapReturnTypestateAttrState(RTSAttr); |
| 1004 | } else if (isConsumableType(ReturnType)) |
| 1005 | ExpectedReturnState = mapConsumableAttrState(ReturnType); |
| 1006 | else |
| 1007 | ExpectedReturnState = CS_None; |
| 1008 | } |
| 1009 | |
DeLesley Hutchins | b7dc1f5 | 2013-08-29 17:26:57 +0000 | [diff] [blame] | 1010 | bool ConsumedAnalyzer::splitState(const CFGBlock *CurrBlock, |
| 1011 | const ConsumedStmtVisitor &Visitor) { |
DeLesley Hutchins | df7bef0 | 2013-08-12 21:20:55 +0000 | [diff] [blame] | 1012 | |
DeLesley Hutchins | b7dc1f5 | 2013-08-29 17:26:57 +0000 | [diff] [blame] | 1013 | ConsumedStateMap *FalseStates = new ConsumedStateMap(*CurrStates); |
| 1014 | PropagationInfo PInfo; |
DeLesley Hutchins | df7bef0 | 2013-08-12 21:20:55 +0000 | [diff] [blame] | 1015 | |
DeLesley Hutchins | b7dc1f5 | 2013-08-29 17:26:57 +0000 | [diff] [blame] | 1016 | if (const IfStmt *IfNode = |
| 1017 | dyn_cast_or_null<IfStmt>(CurrBlock->getTerminator().getStmt())) { |
DeLesley Hutchins | df7bef0 | 2013-08-12 21:20:55 +0000 | [diff] [blame] | 1018 | |
DeLesley Hutchins | b7dc1f5 | 2013-08-29 17:26:57 +0000 | [diff] [blame] | 1019 | bool HasElse = IfNode->getElse() != NULL; |
| 1020 | const Stmt *Cond = IfNode->getCond(); |
DeLesley Hutchins | df7bef0 | 2013-08-12 21:20:55 +0000 | [diff] [blame] | 1021 | |
DeLesley Hutchins | b7dc1f5 | 2013-08-29 17:26:57 +0000 | [diff] [blame] | 1022 | PInfo = Visitor.getInfo(Cond); |
| 1023 | if (!PInfo.isValid() && isa<BinaryOperator>(Cond)) |
| 1024 | PInfo = Visitor.getInfo(cast<BinaryOperator>(Cond)->getRHS()); |
| 1025 | |
| 1026 | if (PInfo.isTest()) { |
| 1027 | CurrStates->setSource(Cond); |
| 1028 | FalseStates->setSource(Cond); |
| 1029 | |
| 1030 | splitVarStateForIf(IfNode, PInfo.getTest(), CurrStates, |
| 1031 | HasElse ? FalseStates : NULL); |
| 1032 | |
| 1033 | } else if (PInfo.isBinTest()) { |
| 1034 | CurrStates->setSource(PInfo.testSourceNode()); |
| 1035 | FalseStates->setSource(PInfo.testSourceNode()); |
| 1036 | |
| 1037 | splitVarStateForIfBinOp(PInfo, CurrStates, HasElse ? FalseStates : NULL); |
DeLesley Hutchins | df7bef0 | 2013-08-12 21:20:55 +0000 | [diff] [blame] | 1038 | |
| 1039 | } else { |
DeLesley Hutchins | b7dc1f5 | 2013-08-29 17:26:57 +0000 | [diff] [blame] | 1040 | delete FalseStates; |
| 1041 | return false; |
DeLesley Hutchins | df7bef0 | 2013-08-12 21:20:55 +0000 | [diff] [blame] | 1042 | } |
DeLesley Hutchins | df7bef0 | 2013-08-12 21:20:55 +0000 | [diff] [blame] | 1043 | |
DeLesley Hutchins | b7dc1f5 | 2013-08-29 17:26:57 +0000 | [diff] [blame] | 1044 | } else if (const BinaryOperator *BinOp = |
| 1045 | dyn_cast_or_null<BinaryOperator>(CurrBlock->getTerminator().getStmt())) { |
| 1046 | |
| 1047 | PInfo = Visitor.getInfo(BinOp->getLHS()); |
| 1048 | if (!PInfo.isTest()) { |
| 1049 | if ((BinOp = dyn_cast_or_null<BinaryOperator>(BinOp->getLHS()))) { |
| 1050 | PInfo = Visitor.getInfo(BinOp->getRHS()); |
| 1051 | |
| 1052 | if (!PInfo.isTest()) { |
| 1053 | delete FalseStates; |
| 1054 | return false; |
| 1055 | } |
| 1056 | |
| 1057 | } else { |
| 1058 | delete FalseStates; |
| 1059 | return false; |
| 1060 | } |
| 1061 | } |
| 1062 | |
| 1063 | CurrStates->setSource(BinOp); |
| 1064 | FalseStates->setSource(BinOp); |
| 1065 | |
| 1066 | const VarTestResult &Test = PInfo.getTest(); |
| 1067 | ConsumedState VarState = CurrStates->getState(Test.Var); |
| 1068 | |
| 1069 | if (BinOp->getOpcode() == BO_LAnd) { |
| 1070 | if (VarState == CS_Unknown) |
| 1071 | CurrStates->setState(Test.Var, Test.TestsFor); |
| 1072 | else if (VarState == invertConsumedUnconsumed(Test.TestsFor)) |
| 1073 | CurrStates->markUnreachable(); |
| 1074 | |
| 1075 | } else if (BinOp->getOpcode() == BO_LOr) { |
| 1076 | if (VarState == CS_Unknown) |
| 1077 | FalseStates->setState(Test.Var, |
| 1078 | invertConsumedUnconsumed(Test.TestsFor)); |
| 1079 | else if (VarState == Test.TestsFor) |
| 1080 | FalseStates->markUnreachable(); |
| 1081 | } |
| 1082 | |
| 1083 | } else { |
| 1084 | delete FalseStates; |
| 1085 | return false; |
| 1086 | } |
| 1087 | |
DeLesley Hutchins | df7bef0 | 2013-08-12 21:20:55 +0000 | [diff] [blame] | 1088 | CFGBlock::const_succ_iterator SI = CurrBlock->succ_begin(); |
| 1089 | |
DeLesley Hutchins | b7dc1f5 | 2013-08-29 17:26:57 +0000 | [diff] [blame] | 1090 | if (*SI) |
| 1091 | BlockInfo.addInfo(*SI, CurrStates); |
| 1092 | else |
| 1093 | delete CurrStates; |
| 1094 | |
| 1095 | if (*++SI) |
| 1096 | BlockInfo.addInfo(*SI, FalseStates); |
| 1097 | else |
| 1098 | delete FalseStates; |
| 1099 | |
| 1100 | CurrStates = NULL; |
| 1101 | return true; |
DeLesley Hutchins | df7bef0 | 2013-08-12 21:20:55 +0000 | [diff] [blame] | 1102 | } |
| 1103 | |
| 1104 | void ConsumedAnalyzer::run(AnalysisDeclContext &AC) { |
| 1105 | const FunctionDecl *D = dyn_cast_or_null<FunctionDecl>(AC.getDecl()); |
| 1106 | |
| 1107 | if (!D) return; |
| 1108 | |
David Blaikie | a33ab60 | 2013-09-06 01:28:43 +0000 | [diff] [blame^] | 1109 | determineExpectedReturnState(AC, D); |
DeLesley Hutchins | 0e8534e | 2013-09-03 20:11:38 +0000 | [diff] [blame] | 1110 | |
DeLesley Hutchins | df7bef0 | 2013-08-12 21:20:55 +0000 | [diff] [blame] | 1111 | BlockInfo = ConsumedBlockInfo(AC.getCFG()); |
| 1112 | |
| 1113 | PostOrderCFGView *SortedGraph = AC.getAnalysis<PostOrderCFGView>(); |
| 1114 | |
| 1115 | CurrStates = new ConsumedStateMap(); |
DeLesley Hutchins | 4252598 | 2013-08-29 22:36:05 +0000 | [diff] [blame] | 1116 | ConsumedStmtVisitor Visitor(AC, *this, CurrStates); |
| 1117 | |
| 1118 | // Add all trackable parameters to the state map. |
| 1119 | for (FunctionDecl::param_const_iterator PI = D->param_begin(), |
| 1120 | PE = D->param_end(); PI != PE; ++PI) { |
| 1121 | Visitor.VisitParmVarDecl(*PI); |
| 1122 | } |
DeLesley Hutchins | df7bef0 | 2013-08-12 21:20:55 +0000 | [diff] [blame] | 1123 | |
| 1124 | // Visit all of the function's basic blocks. |
| 1125 | for (PostOrderCFGView::iterator I = SortedGraph->begin(), |
| 1126 | E = SortedGraph->end(); I != E; ++I) { |
| 1127 | |
| 1128 | const CFGBlock *CurrBlock = *I; |
| 1129 | BlockInfo.markVisited(CurrBlock); |
| 1130 | |
| 1131 | if (CurrStates == NULL) |
| 1132 | CurrStates = BlockInfo.getInfo(CurrBlock); |
DeLesley Hutchins | b7dc1f5 | 2013-08-29 17:26:57 +0000 | [diff] [blame] | 1133 | |
| 1134 | if (!CurrStates) { |
| 1135 | continue; |
| 1136 | |
| 1137 | } else if (!CurrStates->isReachable()) { |
| 1138 | delete CurrStates; |
| 1139 | CurrStates = NULL; |
| 1140 | continue; |
| 1141 | } |
| 1142 | |
| 1143 | Visitor.reset(CurrStates); |
| 1144 | |
DeLesley Hutchins | df7bef0 | 2013-08-12 21:20:55 +0000 | [diff] [blame] | 1145 | // Visit all of the basic block's statements. |
| 1146 | for (CFGBlock::const_iterator BI = CurrBlock->begin(), |
| 1147 | BE = CurrBlock->end(); BI != BE; ++BI) { |
| 1148 | |
DeLesley Hutchins | 5fdd207 | 2013-08-22 20:44:47 +0000 | [diff] [blame] | 1149 | switch (BI->getKind()) { |
| 1150 | case CFGElement::Statement: |
DeLesley Hutchins | df7bef0 | 2013-08-12 21:20:55 +0000 | [diff] [blame] | 1151 | Visitor.Visit(BI->castAs<CFGStmt>().getStmt()); |
DeLesley Hutchins | 5fdd207 | 2013-08-22 20:44:47 +0000 | [diff] [blame] | 1152 | break; |
| 1153 | case CFGElement::AutomaticObjectDtor: |
| 1154 | CurrStates->remove(BI->castAs<CFGAutomaticObjDtor>().getVarDecl()); |
| 1155 | default: |
| 1156 | break; |
| 1157 | } |
DeLesley Hutchins | df7bef0 | 2013-08-12 21:20:55 +0000 | [diff] [blame] | 1158 | } |
| 1159 | |
DeLesley Hutchins | b7dc1f5 | 2013-08-29 17:26:57 +0000 | [diff] [blame] | 1160 | // TODO: Handle other forms of branching with precision, including while- |
| 1161 | // and for-loops. (Deferred) |
| 1162 | if (!splitState(CurrBlock, Visitor)) { |
| 1163 | CurrStates->setSource(NULL); |
DeLesley Hutchins | df7bef0 | 2013-08-12 21:20:55 +0000 | [diff] [blame] | 1164 | |
DeLesley Hutchins | b7dc1f5 | 2013-08-29 17:26:57 +0000 | [diff] [blame] | 1165 | if (CurrBlock->succ_size() > 1) { |
| 1166 | CurrStates->makeUnknown(); |
DeLesley Hutchins | df7bef0 | 2013-08-12 21:20:55 +0000 | [diff] [blame] | 1167 | |
DeLesley Hutchins | b7dc1f5 | 2013-08-29 17:26:57 +0000 | [diff] [blame] | 1168 | bool OwnershipTaken = false; |
| 1169 | |
| 1170 | for (CFGBlock::const_succ_iterator SI = CurrBlock->succ_begin(), |
| 1171 | SE = CurrBlock->succ_end(); SI != SE; ++SI) { |
| 1172 | |
| 1173 | if (*SI) BlockInfo.addInfo(*SI, CurrStates, OwnershipTaken); |
| 1174 | } |
| 1175 | |
| 1176 | if (!OwnershipTaken) |
| 1177 | delete CurrStates; |
| 1178 | |
| 1179 | CurrStates = NULL; |
| 1180 | |
| 1181 | } else if (CurrBlock->succ_size() == 1 && |
| 1182 | (*CurrBlock->succ_begin())->pred_size() > 1) { |
| 1183 | |
| 1184 | BlockInfo.addInfo(*CurrBlock->succ_begin(), CurrStates); |
| 1185 | CurrStates = NULL; |
DeLesley Hutchins | df7bef0 | 2013-08-12 21:20:55 +0000 | [diff] [blame] | 1186 | } |
DeLesley Hutchins | df7bef0 | 2013-08-12 21:20:55 +0000 | [diff] [blame] | 1187 | } |
DeLesley Hutchins | df7bef0 | 2013-08-12 21:20:55 +0000 | [diff] [blame] | 1188 | } // End of block iterator. |
| 1189 | |
| 1190 | // Delete the last existing state map. |
| 1191 | delete CurrStates; |
| 1192 | |
| 1193 | WarningsHandler.emitDiagnostics(); |
| 1194 | } |
DeLesley Hutchins | df7bef0 | 2013-08-12 21:20:55 +0000 | [diff] [blame] | 1195 | }} // end namespace clang::consumed |