CFG.cpp revision e8d6d2b9a2c5d3f0e7e0f88f54f1711bbc6c6f78
1fddd51853f8ccaa1df2476376e6fd74d2f315c73Ted Kremenek//===--- CFG.cpp - Classes for representing and building CFGs----*- C++ -*-===// 2fddd51853f8ccaa1df2476376e6fd74d2f315c73Ted Kremenek// 3fddd51853f8ccaa1df2476376e6fd74d2f315c73Ted Kremenek// The LLVM Compiler Infrastructure 4fddd51853f8ccaa1df2476376e6fd74d2f315c73Ted Kremenek// 50bc735ffcfb223c0186419547abaa5c84482663eChris Lattner// This file is distributed under the University of Illinois Open Source 60bc735ffcfb223c0186419547abaa5c84482663eChris Lattner// License. See LICENSE.TXT for details. 7fddd51853f8ccaa1df2476376e6fd74d2f315c73Ted Kremenek// 8fddd51853f8ccaa1df2476376e6fd74d2f315c73Ted Kremenek//===----------------------------------------------------------------------===// 9fddd51853f8ccaa1df2476376e6fd74d2f315c73Ted Kremenek// 10fddd51853f8ccaa1df2476376e6fd74d2f315c73Ted Kremenek// This file defines the CFG and CFGBuilder classes for representing and 11fddd51853f8ccaa1df2476376e6fd74d2f315c73Ted Kremenek// building Control-Flow Graphs (CFGs) from ASTs. 12fddd51853f8ccaa1df2476376e6fd74d2f315c73Ted Kremenek// 13fddd51853f8ccaa1df2476376e6fd74d2f315c73Ted Kremenek//===----------------------------------------------------------------------===// 14fddd51853f8ccaa1df2476376e6fd74d2f315c73Ted Kremenek 15bd0487825751230a4396952b770349d2beac60b3Ted Kremenek#include "clang/Analysis/Support/SaveAndRestore.h" 16e41611aa2237d06a0ef61db4528fb2883a8defcdTed Kremenek#include "clang/Analysis/CFG.h" 17c310e933a9b023a280f3aa02e5a0c75398555e13Ted Kremenek#include "clang/AST/StmtVisitor.h" 1842a509f6a4f71bb805cc4abbb26722a34dffdddeTed Kremenek#include "clang/AST/PrettyPrinter.h" 197dba8607e59096014b7139ff20ef00870041d518Ted Kremenek#include "llvm/Support/GraphWriter.h" 206fa9b88e2c3d47d606a273df2f8d03509bcff0b9Ted Kremenek#include "llvm/Support/Compiler.h" 216cb7c1a43b0c8f739d1f54b7fdae5ede86033496Benjamin Kramer#include "llvm/Support/Allocator.h" 226cb7c1a43b0c8f739d1f54b7fdae5ede86033496Benjamin Kramer#include "llvm/Support/Format.h" 236cb7c1a43b0c8f739d1f54b7fdae5ede86033496Benjamin Kramer#include "llvm/ADT/DenseMap.h" 246cb7c1a43b0c8f739d1f54b7fdae5ede86033496Benjamin Kramer#include "llvm/ADT/SmallPtrSet.h" 2583c01da96f57cf732a5da9a83e2981241f205dc4Ted Kremenek 26fddd51853f8ccaa1df2476376e6fd74d2f315c73Ted Kremenekusing namespace clang; 27fddd51853f8ccaa1df2476376e6fd74d2f315c73Ted Kremenek 28fddd51853f8ccaa1df2476376e6fd74d2f315c73Ted Kremeneknamespace { 29fddd51853f8ccaa1df2476376e6fd74d2f315c73Ted Kremenek 304afa39deaa245592977136d367251ee2c173dd8dDouglas Gregorstatic SourceLocation GetEndLoc(Decl* D) { 31c7eb9031159f30a63db960fad4640d779f1617c8Ted Kremenek if (VarDecl* VD = dyn_cast<VarDecl>(D)) 32c7eb9031159f30a63db960fad4640d779f1617c8Ted Kremenek if (Expr* Ex = VD->getInit()) 33c7eb9031159f30a63db960fad4640d779f1617c8Ted Kremenek return Ex->getSourceRange().getEnd(); 346d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 356d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump return D->getLocation(); 36c7eb9031159f30a63db960fad4640d779f1617c8Ted Kremenek} 376d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 38a34ea072371154c9042ce86321d17fbb4df1f84dTed Kremenek/// CFGBuilder - This class implements CFG construction from an AST. 39fddd51853f8ccaa1df2476376e6fd74d2f315c73Ted Kremenek/// The builder is stateful: an instance of the builder should be used to only 40fddd51853f8ccaa1df2476376e6fd74d2f315c73Ted Kremenek/// construct a single CFG. 41fddd51853f8ccaa1df2476376e6fd74d2f315c73Ted Kremenek/// 42fddd51853f8ccaa1df2476376e6fd74d2f315c73Ted Kremenek/// Example usage: 43fddd51853f8ccaa1df2476376e6fd74d2f315c73Ted Kremenek/// 44fddd51853f8ccaa1df2476376e6fd74d2f315c73Ted Kremenek/// CFGBuilder builder; 45fddd51853f8ccaa1df2476376e6fd74d2f315c73Ted Kremenek/// CFG* cfg = builder.BuildAST(stmt1); 46fddd51853f8ccaa1df2476376e6fd74d2f315c73Ted Kremenek/// 476d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump/// CFG construction is done via a recursive walk of an AST. We actually parse 486d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump/// the AST in reverse order so that the successor of a basic block is 496d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump/// constructed prior to its predecessor. This allows us to nicely capture 506d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump/// implicit fall-throughs without extra basic blocks. 51c310e933a9b023a280f3aa02e5a0c75398555e13Ted Kremenek/// 524f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenekclass VISIBILITY_HIDDEN CFGBuilder { 53e5af3ce53ec58995b09381ba645ab2117a46647bMike Stump ASTContext *Context; 54fddd51853f8ccaa1df2476376e6fd74d2f315c73Ted Kremenek CFG* cfg; 55fddd51853f8ccaa1df2476376e6fd74d2f315c73Ted Kremenek CFGBlock* Block; 56fddd51853f8ccaa1df2476376e6fd74d2f315c73Ted Kremenek CFGBlock* Succ; 57bf15b278a439d73b605ec00a8d3977ef305712f4Ted Kremenek CFGBlock* ContinueTargetBlock; 588a294713e032e4a27bae61c040abb41397952676Ted Kremenek CFGBlock* BreakTargetBlock; 59b5c13b0f4e438391b31dacb87641be7a1b990b57Ted Kremenek CFGBlock* SwitchTerminatedBlock; 60eef5a9ac59f4f8b868ef0657ccf6bec81b4fe37aTed Kremenek CFGBlock* DefaultCaseBlock; 616d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 6219bb356317952445b03ee341c02f6147083c9eeaTed Kremenek // LabelMap records the mapping from Label expressions to their blocks. 630cebe3e29b22d11f2c65ef28fcfb5f0431877266Ted Kremenek typedef llvm::DenseMap<LabelStmt*,CFGBlock*> LabelMapTy; 640cebe3e29b22d11f2c65ef28fcfb5f0431877266Ted Kremenek LabelMapTy LabelMap; 656d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 666d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // A list of blocks that end with a "goto" that must be backpatched to their 676d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // resolved targets upon completion of CFG construction. 684a2b8a10c4730eb2ceeec24505bef26eb7d829edTed Kremenek typedef std::vector<CFGBlock*> BackpatchBlocksTy; 690cebe3e29b22d11f2c65ef28fcfb5f0431877266Ted Kremenek BackpatchBlocksTy BackpatchBlocks; 706d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 7119bb356317952445b03ee341c02f6147083c9eeaTed Kremenek // A list of labels whose address has been taken (for indirect gotos). 7219bb356317952445b03ee341c02f6147083c9eeaTed Kremenek typedef llvm::SmallPtrSet<LabelStmt*,5> LabelSetTy; 7319bb356317952445b03ee341c02f6147083c9eeaTed Kremenek LabelSetTy AddressTakenLabels; 746d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 756d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stumppublic: 76026473c2175424a039f51ca8949937268721b965Ted Kremenek explicit CFGBuilder() : cfg(NULL), Block(NULL), Succ(NULL), 778a294713e032e4a27bae61c040abb41397952676Ted Kremenek ContinueTargetBlock(NULL), BreakTargetBlock(NULL), 78eef5a9ac59f4f8b868ef0657ccf6bec81b4fe37aTed Kremenek SwitchTerminatedBlock(NULL), DefaultCaseBlock(NULL) { 79fddd51853f8ccaa1df2476376e6fd74d2f315c73Ted Kremenek // Create an empty CFG. 806d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump cfg = new CFG(); 81fddd51853f8ccaa1df2476376e6fd74d2f315c73Ted Kremenek } 826d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 83fddd51853f8ccaa1df2476376e6fd74d2f315c73Ted Kremenek ~CFGBuilder() { delete cfg; } 846d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 85d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek // buildCFG - Used by external clients to construct the CFG. 86e5af3ce53ec58995b09381ba645ab2117a46647bMike Stump CFG* buildCFG(Stmt *Statement, ASTContext *C); 876d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 884f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenekprivate: 894f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek // Visitors to walk an AST and construct the CFG. 904f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek CFGBlock *VisitAddrLabelExpr(AddrLabelExpr *A, bool alwaysAdd); 914f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek CFGBlock *VisitBinaryOperator(BinaryOperator *B, bool alwaysAdd); 9213fc08a323b29dd97a46def1e3a15bf082476efaTed Kremenek CFGBlock *VisitBlockExpr(BlockExpr* E, bool alwaysAdd); 9313fc08a323b29dd97a46def1e3a15bf082476efaTed Kremenek CFGBlock *VisitBlockDeclRefExpr(BlockDeclRefExpr* E, bool alwaysAdd); 944f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek CFGBlock *VisitBreakStmt(BreakStmt *B); 954f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek CFGBlock *VisitCallExpr(CallExpr *C, bool alwaysAdd); 964f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek CFGBlock *VisitCaseStmt(CaseStmt *C); 973fc8ef574cdc09c613c329ee511852d219263c15Ted Kremenek CFGBlock *VisitChooseExpr(ChooseExpr *C); 983fc8ef574cdc09c613c329ee511852d219263c15Ted Kremenek CFGBlock *VisitCompoundStmt(CompoundStmt *C); 993fc8ef574cdc09c613c329ee511852d219263c15Ted Kremenek CFGBlock *VisitConditionalOperator(ConditionalOperator *C); 1003fc8ef574cdc09c613c329ee511852d219263c15Ted Kremenek CFGBlock *VisitContinueStmt(ContinueStmt *C); 1010979d80615df97c675423de631c1b884819f4712Mike Stump CFGBlock *VisitCXXThrowExpr(CXXThrowExpr *T); 1024f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek CFGBlock *VisitDeclStmt(DeclStmt *DS); 1034f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek CFGBlock *VisitDeclSubExpr(Decl* D); 1043fc8ef574cdc09c613c329ee511852d219263c15Ted Kremenek CFGBlock *VisitDefaultStmt(DefaultStmt *D); 1053fc8ef574cdc09c613c329ee511852d219263c15Ted Kremenek CFGBlock *VisitDoStmt(DoStmt *D); 1063fc8ef574cdc09c613c329ee511852d219263c15Ted Kremenek CFGBlock *VisitForStmt(ForStmt *F); 1074f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek CFGBlock *VisitGotoStmt(GotoStmt* G); 1084f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek CFGBlock *VisitIfStmt(IfStmt *I); 1094f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek CFGBlock *VisitIndirectGotoStmt(IndirectGotoStmt *I); 1104f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek CFGBlock *VisitLabelStmt(LabelStmt *L); 1114f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek CFGBlock *VisitObjCAtCatchStmt(ObjCAtCatchStmt *S); 1124f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek CFGBlock *VisitObjCAtSynchronizedStmt(ObjCAtSynchronizedStmt *S); 1134f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek CFGBlock *VisitObjCAtThrowStmt(ObjCAtThrowStmt *S); 1144f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek CFGBlock *VisitObjCAtTryStmt(ObjCAtTryStmt *S); 1154f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek CFGBlock *VisitObjCForCollectionStmt(ObjCForCollectionStmt *S); 1164f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek CFGBlock *VisitReturnStmt(ReturnStmt* R); 11713fc08a323b29dd97a46def1e3a15bf082476efaTed Kremenek CFGBlock *VisitSizeOfAlignOfExpr(SizeOfAlignOfExpr *E, bool alwaysAdd); 11813fc08a323b29dd97a46def1e3a15bf082476efaTed Kremenek CFGBlock *VisitStmtExpr(StmtExpr *S, bool alwaysAdd); 1194f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek CFGBlock *VisitSwitchStmt(SwitchStmt *S); 1204f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek CFGBlock *VisitWhileStmt(WhileStmt *W); 1214f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek 1224f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek CFGBlock *Visit(Stmt *S, bool alwaysAdd = false); 1234f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek CFGBlock *VisitStmt(Stmt *S, bool alwaysAdd); 1244f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek CFGBlock *VisitChildren(Stmt* S); 125cd7bf230a77c550115e4a78ee371fc49a7563692Mike Stump 126274f4334f6dd35239e5c3d4b86198f7f5804b059Ted Kremenek // NYS == Not Yet Supported 127274f4334f6dd35239e5c3d4b86198f7f5804b059Ted Kremenek CFGBlock* NYS() { 1284102af916d52310c3deedd84d6fd5e2fd3c09bfeTed Kremenek badCFG = true; 1294102af916d52310c3deedd84d6fd5e2fd3c09bfeTed Kremenek return Block; 1304102af916d52310c3deedd84d6fd5e2fd3c09bfeTed Kremenek } 1316d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 1324f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek void autoCreateBlock() { if (!Block) Block = createBlock(); } 1334f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek CFGBlock *createBlock(bool add_successor = true); 1344e8df2eb7072db8f66572c3db31a2a08b12a752eTed Kremenek bool FinishBlock(CFGBlock* B); 1354f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek CFGBlock *addStmt(Stmt *S) { return Visit(S, true); } 1364f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek 137fadc9eaeac18b470b6dfcf9efcf5c4f8caea89bcTed Kremenek 138fadc9eaeac18b470b6dfcf9efcf5c4f8caea89bcTed Kremenek /// TryResult - a class representing a variant over the values 139fadc9eaeac18b470b6dfcf9efcf5c4f8caea89bcTed Kremenek /// 'true', 'false', or 'unknown'. This is returned by TryEvaluateBool, 140fadc9eaeac18b470b6dfcf9efcf5c4f8caea89bcTed Kremenek /// and is used by the CFGBuilder to decide if a branch condition 141fadc9eaeac18b470b6dfcf9efcf5c4f8caea89bcTed Kremenek /// can be decided up front during CFG construction. 142941fde8019d47c694b8483db45d5878818fa69d1Ted Kremenek class TryResult { 143941fde8019d47c694b8483db45d5878818fa69d1Ted Kremenek int X; 144941fde8019d47c694b8483db45d5878818fa69d1Ted Kremenek public: 145941fde8019d47c694b8483db45d5878818fa69d1Ted Kremenek TryResult(bool b) : X(b ? 1 : 0) {} 146941fde8019d47c694b8483db45d5878818fa69d1Ted Kremenek TryResult() : X(-1) {} 147941fde8019d47c694b8483db45d5878818fa69d1Ted Kremenek 148941fde8019d47c694b8483db45d5878818fa69d1Ted Kremenek bool isTrue() const { return X == 1; } 149941fde8019d47c694b8483db45d5878818fa69d1Ted Kremenek bool isFalse() const { return X == 0; } 150941fde8019d47c694b8483db45d5878818fa69d1Ted Kremenek bool isKnown() const { return X >= 0; } 151941fde8019d47c694b8483db45d5878818fa69d1Ted Kremenek void negate() { 152941fde8019d47c694b8483db45d5878818fa69d1Ted Kremenek assert(isKnown()); 153941fde8019d47c694b8483db45d5878818fa69d1Ted Kremenek X ^= 0x1; 154941fde8019d47c694b8483db45d5878818fa69d1Ted Kremenek } 155941fde8019d47c694b8483db45d5878818fa69d1Ted Kremenek }; 156941fde8019d47c694b8483db45d5878818fa69d1Ted Kremenek 15700998a068e50945118f334c98af05ed44d7c22a6Mike Stump /// TryEvaluateBool - Try and evaluate the Stmt and return 0 or 1 15800998a068e50945118f334c98af05ed44d7c22a6Mike Stump /// if we can evaluate to a known value, otherwise return -1. 159941fde8019d47c694b8483db45d5878818fa69d1Ted Kremenek TryResult TryEvaluateBool(Expr *S) { 16000998a068e50945118f334c98af05ed44d7c22a6Mike Stump Expr::EvalResult Result; 1619983cc110422a2e976191a0ce6ac4f1d7b634cc0Douglas Gregor if (!S->isTypeDependent() && !S->isValueDependent() && 1629983cc110422a2e976191a0ce6ac4f1d7b634cc0Douglas Gregor S->Evaluate(Result, *Context) && Result.Val.isInt()) 163fadc9eaeac18b470b6dfcf9efcf5c4f8caea89bcTed Kremenek return Result.Val.getInt().getBoolValue(); 164941fde8019d47c694b8483db45d5878818fa69d1Ted Kremenek 165941fde8019d47c694b8483db45d5878818fa69d1Ted Kremenek return TryResult(); 16600998a068e50945118f334c98af05ed44d7c22a6Mike Stump } 16700998a068e50945118f334c98af05ed44d7c22a6Mike Stump 1684102af916d52310c3deedd84d6fd5e2fd3c09bfeTed Kremenek bool badCFG; 169d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek}; 1706d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 171898574e7496ba8fd76290079d3a9d06954992734Douglas Gregor// FIXME: Add support for dependent-sized array types in C++? 172898574e7496ba8fd76290079d3a9d06954992734Douglas Gregor// Does it even make sense to build a CFG for an uninstantiated template? 173610a09e409bea151a42dd907768f1e0c4b103f1fTed Kremenekstatic VariableArrayType* FindVA(Type* t) { 174610a09e409bea151a42dd907768f1e0c4b103f1fTed Kremenek while (ArrayType* vt = dyn_cast<ArrayType>(t)) { 175610a09e409bea151a42dd907768f1e0c4b103f1fTed Kremenek if (VariableArrayType* vat = dyn_cast<VariableArrayType>(vt)) 176610a09e409bea151a42dd907768f1e0c4b103f1fTed Kremenek if (vat->getSizeExpr()) 177610a09e409bea151a42dd907768f1e0c4b103f1fTed Kremenek return vat; 1786d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 179610a09e409bea151a42dd907768f1e0c4b103f1fTed Kremenek t = vt->getElementType().getTypePtr(); 180610a09e409bea151a42dd907768f1e0c4b103f1fTed Kremenek } 1816d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 182610a09e409bea151a42dd907768f1e0c4b103f1fTed Kremenek return 0; 183610a09e409bea151a42dd907768f1e0c4b103f1fTed Kremenek} 1846d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 1856d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump/// BuildCFG - Constructs a CFG from an AST (a Stmt*). The AST can represent an 1866d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump/// arbitrary statement. Examples include a single expression or a function 1876d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump/// body (compound statement). The ownership of the returned CFG is 1886d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump/// transferred to the caller. If CFG construction fails, this method returns 1896d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump/// NULL. 190e5af3ce53ec58995b09381ba645ab2117a46647bMike StumpCFG* CFGBuilder::buildCFG(Stmt* Statement, ASTContext* C) { 191e5af3ce53ec58995b09381ba645ab2117a46647bMike Stump Context = C; 1924f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek assert(cfg); 1934f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek if (!Statement) 1944f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek return NULL; 195d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek 1964102af916d52310c3deedd84d6fd5e2fd3c09bfeTed Kremenek badCFG = false; 1976d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 1986d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // Create an empty block that will serve as the exit block for the CFG. Since 1996d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // this is the first block added to the CFG, it will be implicitly registered 2006d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // as the exit block. 20149af7cb8a3aca79783e7a0708b97a8f856f0da22Ted Kremenek Succ = createBlock(); 20249af7cb8a3aca79783e7a0708b97a8f856f0da22Ted Kremenek assert (Succ == &cfg->getExit()); 20349af7cb8a3aca79783e7a0708b97a8f856f0da22Ted Kremenek Block = NULL; // the EXIT block is empty. Create all other blocks lazily. 2046d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 205d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek // Visit the statements and create the CFG. 2064f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek CFGBlock* B = addStmt(Statement); 2070d99ecf1d8b9c72f2c4130f5f1be6cf13556b031Ted Kremenek if (!B) B = Succ; 2086d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 2090d99ecf1d8b9c72f2c4130f5f1be6cf13556b031Ted Kremenek if (B) { 2106d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // Finalize the last constructed block. This usually involves reversing the 2116d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // order of the statements in the block. 21249af7cb8a3aca79783e7a0708b97a8f856f0da22Ted Kremenek if (Block) FinishBlock(B); 2136d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 2146d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // Backpatch the gotos whose label -> block mappings we didn't know when we 2156d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // encountered them. 2166d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump for (BackpatchBlocksTy::iterator I = BackpatchBlocks.begin(), 217d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek E = BackpatchBlocks.end(); I != E; ++I ) { 2186d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 219d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek CFGBlock* B = *I; 220d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek GotoStmt* G = cast<GotoStmt>(B->getTerminator()); 221d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek LabelMapTy::iterator LI = LabelMap.find(G->getLabel()); 222d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek 223d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek // If there is no target for the goto, then we are looking at an 224d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek // incomplete AST. Handle this by not registering a successor. 225d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek if (LI == LabelMap.end()) continue; 2266d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 2276d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump B->addSuccessor(LI->second); 22819bb356317952445b03ee341c02f6147083c9eeaTed Kremenek } 2296d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 23019bb356317952445b03ee341c02f6147083c9eeaTed Kremenek // Add successors to the Indirect Goto Dispatch block (if we have one). 23119bb356317952445b03ee341c02f6147083c9eeaTed Kremenek if (CFGBlock* B = cfg->getIndirectGotoBlock()) 23219bb356317952445b03ee341c02f6147083c9eeaTed Kremenek for (LabelSetTy::iterator I = AddressTakenLabels.begin(), 23319bb356317952445b03ee341c02f6147083c9eeaTed Kremenek E = AddressTakenLabels.end(); I != E; ++I ) { 23419bb356317952445b03ee341c02f6147083c9eeaTed Kremenek 23519bb356317952445b03ee341c02f6147083c9eeaTed Kremenek // Lookup the target block. 23619bb356317952445b03ee341c02f6147083c9eeaTed Kremenek LabelMapTy::iterator LI = LabelMap.find(*I); 23719bb356317952445b03ee341c02f6147083c9eeaTed Kremenek 23819bb356317952445b03ee341c02f6147083c9eeaTed Kremenek // If there is no target block that contains label, then we are looking 23919bb356317952445b03ee341c02f6147083c9eeaTed Kremenek // at an incomplete AST. Handle this by not registering a successor. 24019bb356317952445b03ee341c02f6147083c9eeaTed Kremenek if (LI == LabelMap.end()) continue; 2416d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 2426d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump B->addSuccessor(LI->second); 24319bb356317952445b03ee341c02f6147083c9eeaTed Kremenek } 2446d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 24594b3316ee37743cb60bf552d5616b03d17e277daTed Kremenek Succ = B; 24694b3316ee37743cb60bf552d5616b03d17e277daTed Kremenek } 2476d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 2486d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // Create an empty entry block that has no predecessors. 249322f58d3830da13b419646c071e3ab801518a09cTed Kremenek cfg->setEntry(createBlock()); 2506d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 2514102af916d52310c3deedd84d6fd5e2fd3c09bfeTed Kremenek if (badCFG) { 2524102af916d52310c3deedd84d6fd5e2fd3c09bfeTed Kremenek delete cfg; 2534102af916d52310c3deedd84d6fd5e2fd3c09bfeTed Kremenek cfg = NULL; 2544102af916d52310c3deedd84d6fd5e2fd3c09bfeTed Kremenek return NULL; 2554102af916d52310c3deedd84d6fd5e2fd3c09bfeTed Kremenek } 2566d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 2576d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // NULL out cfg so that repeated calls to the builder will fail and that the 2586d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // ownership of the constructed CFG is passed to the caller. 259322f58d3830da13b419646c071e3ab801518a09cTed Kremenek CFG* t = cfg; 260322f58d3830da13b419646c071e3ab801518a09cTed Kremenek cfg = NULL; 261322f58d3830da13b419646c071e3ab801518a09cTed Kremenek return t; 262d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek} 2636d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 264d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek/// createBlock - Used to lazily create blocks that are connected 265d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek/// to the current (global) succcessor. 2666d9828c82c9321f042ab416fd2ffaa3034347d45Mike StumpCFGBlock* CFGBuilder::createBlock(bool add_successor) { 2679438252ad2ecae5338df565ca33c6969e4fbfa41Ted Kremenek CFGBlock* B = cfg->createBlock(); 2684f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek if (add_successor && Succ) 2694f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek B->addSuccessor(Succ); 270d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek return B; 271d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek} 2726d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 2736d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump/// FinishBlock - When the last statement has been added to the block, we must 2746d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump/// reverse the statements because they have been inserted in reverse order. 2754e8df2eb7072db8f66572c3db31a2a08b12a752eTed Kremenekbool CFGBuilder::FinishBlock(CFGBlock* B) { 2764e8df2eb7072db8f66572c3db31a2a08b12a752eTed Kremenek if (badCFG) 2774e8df2eb7072db8f66572c3db31a2a08b12a752eTed Kremenek return false; 2784e8df2eb7072db8f66572c3db31a2a08b12a752eTed Kremenek 2794f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek assert(B); 28049af7cb8a3aca79783e7a0708b97a8f856f0da22Ted Kremenek B->reverseStmts(); 2814e8df2eb7072db8f66572c3db31a2a08b12a752eTed Kremenek return true; 282d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek} 283d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek 2844f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek/// Visit - Walk the subtree of a statement and add extra 2856d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump/// blocks for ternary operators, &&, and ||. We also process "," and 2866d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump/// DeclStmts (which may contain nested control-flow). 2874f88063677a2d990a44bb0d5f8437d2498b91d7fTed KremenekCFGBlock* CFGBuilder::Visit(Stmt * S, bool alwaysAdd) { 2884f88063677a2d990a44bb0d5f8437d2498b91d7fTed KremenektryAgain: 2894f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek switch (S->getStmtClass()) { 2904f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek default: 2914f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek return VisitStmt(S, alwaysAdd); 2924f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek 2934f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek case Stmt::AddrLabelExprClass: 2944f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek return VisitAddrLabelExpr(cast<AddrLabelExpr>(S), alwaysAdd); 2954f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek 2964f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek case Stmt::BinaryOperatorClass: 2974f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek return VisitBinaryOperator(cast<BinaryOperator>(S), alwaysAdd); 2984f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek 2994f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek case Stmt::BlockExprClass: 30013fc08a323b29dd97a46def1e3a15bf082476efaTed Kremenek return VisitBlockExpr(cast<BlockExpr>(S), alwaysAdd); 3014f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek 3024f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek case Stmt::BlockDeclRefExprClass: 30313fc08a323b29dd97a46def1e3a15bf082476efaTed Kremenek return VisitBlockDeclRefExpr(cast<BlockDeclRefExpr>(S), alwaysAdd); 3044f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek 3054f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek case Stmt::BreakStmtClass: 3064f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek return VisitBreakStmt(cast<BreakStmt>(S)); 3074f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek 3084f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek case Stmt::CallExprClass: 3094f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek return VisitCallExpr(cast<CallExpr>(S), alwaysAdd); 3104f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek 3114f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek case Stmt::CaseStmtClass: 3124f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek return VisitCaseStmt(cast<CaseStmt>(S)); 3134f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek 3144f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek case Stmt::ChooseExprClass: 3154f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek return VisitChooseExpr(cast<ChooseExpr>(S)); 3164f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek 3174f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek case Stmt::CompoundStmtClass: 3184f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek return VisitCompoundStmt(cast<CompoundStmt>(S)); 3194f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek 3204f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek case Stmt::ConditionalOperatorClass: 3214f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek return VisitConditionalOperator(cast<ConditionalOperator>(S)); 3224f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek 3234f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek case Stmt::ContinueStmtClass: 3244f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek return VisitContinueStmt(cast<ContinueStmt>(S)); 3254f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek 3264f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek case Stmt::DeclStmtClass: 3274f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek return VisitDeclStmt(cast<DeclStmt>(S)); 3284f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek 3294f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek case Stmt::DefaultStmtClass: 3304f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek return VisitDefaultStmt(cast<DefaultStmt>(S)); 3314f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek 3324f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek case Stmt::DoStmtClass: 3334f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek return VisitDoStmt(cast<DoStmt>(S)); 3344f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek 3354f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek case Stmt::ForStmtClass: 3364f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek return VisitForStmt(cast<ForStmt>(S)); 3374f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek 3384f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek case Stmt::GotoStmtClass: 3394f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek return VisitGotoStmt(cast<GotoStmt>(S)); 3404f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek 3414f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek case Stmt::IfStmtClass: 3424f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek return VisitIfStmt(cast<IfStmt>(S)); 3434f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek 3444f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek case Stmt::IndirectGotoStmtClass: 3454f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek return VisitIndirectGotoStmt(cast<IndirectGotoStmt>(S)); 3464f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek 3474f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek case Stmt::LabelStmtClass: 3484f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek return VisitLabelStmt(cast<LabelStmt>(S)); 3494f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek 3504f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek case Stmt::ObjCAtCatchStmtClass: 3514f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek return VisitObjCAtCatchStmt(cast<ObjCAtCatchStmt>(S)); 3524f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek 3530979d80615df97c675423de631c1b884819f4712Mike Stump case Stmt::CXXThrowExprClass: 3540979d80615df97c675423de631c1b884819f4712Mike Stump return VisitCXXThrowExpr(cast<CXXThrowExpr>(S)); 3550979d80615df97c675423de631c1b884819f4712Mike Stump 3564f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek case Stmt::ObjCAtSynchronizedStmtClass: 3574f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek return VisitObjCAtSynchronizedStmt(cast<ObjCAtSynchronizedStmt>(S)); 3584f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek 3594f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek case Stmt::ObjCAtThrowStmtClass: 3604f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek return VisitObjCAtThrowStmt(cast<ObjCAtThrowStmt>(S)); 3614f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek 3624f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek case Stmt::ObjCAtTryStmtClass: 3634f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek return VisitObjCAtTryStmt(cast<ObjCAtTryStmt>(S)); 3644f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek 3654f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek case Stmt::ObjCForCollectionStmtClass: 3664f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek return VisitObjCForCollectionStmt(cast<ObjCForCollectionStmt>(S)); 3674f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek 3684f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek case Stmt::ParenExprClass: 3694f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek S = cast<ParenExpr>(S)->getSubExpr(); 3704f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek goto tryAgain; 3714f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek 3724f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek case Stmt::NullStmtClass: 3734f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek return Block; 3744f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek 3754f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek case Stmt::ReturnStmtClass: 3764f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek return VisitReturnStmt(cast<ReturnStmt>(S)); 3774f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek 3784f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek case Stmt::SizeOfAlignOfExprClass: 37913fc08a323b29dd97a46def1e3a15bf082476efaTed Kremenek return VisitSizeOfAlignOfExpr(cast<SizeOfAlignOfExpr>(S), alwaysAdd); 3804f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek 3814f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek case Stmt::StmtExprClass: 38213fc08a323b29dd97a46def1e3a15bf082476efaTed Kremenek return VisitStmtExpr(cast<StmtExpr>(S), alwaysAdd); 3834f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek 3844f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek case Stmt::SwitchStmtClass: 3854f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek return VisitSwitchStmt(cast<SwitchStmt>(S)); 3864f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek 3874f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek case Stmt::WhileStmtClass: 3884f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek return VisitWhileStmt(cast<WhileStmt>(S)); 3894f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek } 3904f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek} 391f34bb2eaa87aa28bcc8b6ff0dfc696cd75605b11Ted Kremenek 3924f88063677a2d990a44bb0d5f8437d2498b91d7fTed KremenekCFGBlock *CFGBuilder::VisitStmt(Stmt *S, bool alwaysAdd) { 3934f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek if (alwaysAdd) { 3944f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek autoCreateBlock(); 3954f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek Block->appendStmt(S); 3966d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump } 3974f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek 3984f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek return VisitChildren(S); 3994f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek} 4006d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 4014f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek/// VisitChildren - Visit the children of a Stmt. 4024f88063677a2d990a44bb0d5f8437d2498b91d7fTed KremenekCFGBlock *CFGBuilder::VisitChildren(Stmt* Terminator) { 4034f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek CFGBlock *B = Block; 4044f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek for (Stmt::child_iterator I = Terminator->child_begin(), 4054f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek E = Terminator->child_end(); I != E; ++I) { 4064f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek if (*I) B = Visit(*I); 4076d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump } 4084f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek return B; 4094f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek} 4104f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek 4114f88063677a2d990a44bb0d5f8437d2498b91d7fTed KremenekCFGBlock *CFGBuilder::VisitAddrLabelExpr(AddrLabelExpr *A, bool alwaysAdd) { 4124f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek AddressTakenLabels.insert(A->getLabel()); 4136d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 4144f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek if (alwaysAdd) { 4154f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek autoCreateBlock(); 4164f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek Block->appendStmt(A); 4176d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump } 4186d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 4194f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek return Block; 4204f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek} 4214f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek 4224f88063677a2d990a44bb0d5f8437d2498b91d7fTed KremenekCFGBlock *CFGBuilder::VisitBinaryOperator(BinaryOperator *B, bool alwaysAdd) { 4234f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek if (B->isLogicalOp()) { // && or || 4244f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek CFGBlock* ConfluenceBlock = Block ? Block : createBlock(); 4254f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek ConfluenceBlock->appendStmt(B); 4264f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek 4274f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek if (!FinishBlock(ConfluenceBlock)) 4284f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek return 0; 4294f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek 4304f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek // create the block evaluating the LHS 4314f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek CFGBlock* LHSBlock = createBlock(false); 4324f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek LHSBlock->setTerminator(B); 4334f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek 4344f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek // create the block evaluating the RHS 4354f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek Succ = ConfluenceBlock; 4364f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek Block = NULL; 4374f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek CFGBlock* RHSBlock = addStmt(B->getRHS()); 4384f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek if (!FinishBlock(RHSBlock)) 4394f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek return 0; 4404f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek 44100998a068e50945118f334c98af05ed44d7c22a6Mike Stump // See if this is a known constant. 442941fde8019d47c694b8483db45d5878818fa69d1Ted Kremenek TryResult KnownVal = TryEvaluateBool(B->getLHS()); 443941fde8019d47c694b8483db45d5878818fa69d1Ted Kremenek if (KnownVal.isKnown() && (B->getOpcode() == BinaryOperator::LOr)) 444941fde8019d47c694b8483db45d5878818fa69d1Ted Kremenek KnownVal.negate(); 44500998a068e50945118f334c98af05ed44d7c22a6Mike Stump 4464f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek // Now link the LHSBlock with RHSBlock. 4474f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek if (B->getOpcode() == BinaryOperator::LOr) { 448941fde8019d47c694b8483db45d5878818fa69d1Ted Kremenek LHSBlock->addSuccessor(KnownVal.isTrue() ? NULL : ConfluenceBlock); 449941fde8019d47c694b8483db45d5878818fa69d1Ted Kremenek LHSBlock->addSuccessor(KnownVal.isFalse() ? NULL : RHSBlock); 450941fde8019d47c694b8483db45d5878818fa69d1Ted Kremenek } else { 4514f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek assert (B->getOpcode() == BinaryOperator::LAnd); 452941fde8019d47c694b8483db45d5878818fa69d1Ted Kremenek LHSBlock->addSuccessor(KnownVal.isFalse() ? NULL : RHSBlock); 453941fde8019d47c694b8483db45d5878818fa69d1Ted Kremenek LHSBlock->addSuccessor(KnownVal.isTrue() ? NULL : ConfluenceBlock); 45419bb356317952445b03ee341c02f6147083c9eeaTed Kremenek } 4554f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek 4564f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek // Generate the blocks for evaluating the LHS. 4574f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek Block = LHSBlock; 4584f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek return addStmt(B->getLHS()); 4594f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek } 4604f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek else if (B->getOpcode() == BinaryOperator::Comma) { // , 4616dc534ecc19a045ebcfe93eefa45da509968e888Ted Kremenek autoCreateBlock(); 4624f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek Block->appendStmt(B); 4634f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek addStmt(B->getRHS()); 4644f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek return addStmt(B->getLHS()); 4656d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump } 4664f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek 4674f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek return VisitStmt(B, alwaysAdd); 4684f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek} 4696d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 47013fc08a323b29dd97a46def1e3a15bf082476efaTed KremenekCFGBlock *CFGBuilder::VisitBlockExpr(BlockExpr* E, bool alwaysAdd) { 4714f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek // FIXME 4724f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek return NYS(); 4734f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek} 474cd7bf230a77c550115e4a78ee371fc49a7563692Mike Stump 47513fc08a323b29dd97a46def1e3a15bf082476efaTed KremenekCFGBlock *CFGBuilder::VisitBlockDeclRefExpr(BlockDeclRefExpr* E, 47613fc08a323b29dd97a46def1e3a15bf082476efaTed Kremenek bool alwaysAdd) { 4774f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek // FIXME 4784f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek return NYS(); 4794f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek} 4804f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek 4814f88063677a2d990a44bb0d5f8437d2498b91d7fTed KremenekCFGBlock *CFGBuilder::VisitBreakStmt(BreakStmt *B) { 4824f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek // "break" is a control-flow statement. Thus we stop processing the current 4834f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek // block. 4844f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek if (Block && !FinishBlock(Block)) 4854f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek return 0; 4864f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek 4874f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek // Now create a new block that ends with the break statement. 4884f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek Block = createBlock(false); 4894f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek Block->setTerminator(B); 4904f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek 4914f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek // If there is no target for the break, then we are looking at an incomplete 4924f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek // AST. This means that the CFG cannot be constructed. 4934f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek if (BreakTargetBlock) 4944f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek Block->addSuccessor(BreakTargetBlock); 4954f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek else 4964f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek badCFG = true; 4974f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek 4984f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek 4994f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek return Block; 5004f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek} 5014f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek 5024f88063677a2d990a44bb0d5f8437d2498b91d7fTed KremenekCFGBlock *CFGBuilder::VisitCallExpr(CallExpr *C, bool alwaysAdd) { 5034f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek // If this is a call to a no-return function, this stops the block here. 5042455636163fdd18581d7fdae816433f886d88213Mike Stump bool NoReturn = false; 5052455636163fdd18581d7fdae816433f886d88213Mike Stump if (C->getCallee()->getType().getNoReturnAttr()) { 5062455636163fdd18581d7fdae816433f886d88213Mike Stump NoReturn = true; 5072455636163fdd18581d7fdae816433f886d88213Mike Stump } 5082455636163fdd18581d7fdae816433f886d88213Mike Stump 5092455636163fdd18581d7fdae816433f886d88213Mike Stump if (FunctionDecl *FD = C->getDirectCallee()) 5102455636163fdd18581d7fdae816433f886d88213Mike Stump if (FD->hasAttr<NoReturnAttr>()) 5112455636163fdd18581d7fdae816433f886d88213Mike Stump NoReturn = true; 5122455636163fdd18581d7fdae816433f886d88213Mike Stump 5132455636163fdd18581d7fdae816433f886d88213Mike Stump if (!NoReturn) 5142455636163fdd18581d7fdae816433f886d88213Mike Stump return VisitStmt(C, alwaysAdd); 5154f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek 5162455636163fdd18581d7fdae816433f886d88213Mike Stump if (Block && !FinishBlock(Block)) 5172455636163fdd18581d7fdae816433f886d88213Mike Stump return 0; 5184f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek 5192455636163fdd18581d7fdae816433f886d88213Mike Stump // Create new block with no successor for the remaining pieces. 5202455636163fdd18581d7fdae816433f886d88213Mike Stump Block = createBlock(false); 5212455636163fdd18581d7fdae816433f886d88213Mike Stump Block->appendStmt(C); 5222455636163fdd18581d7fdae816433f886d88213Mike Stump 5232455636163fdd18581d7fdae816433f886d88213Mike Stump // Wire this to the exit block directly. 5242455636163fdd18581d7fdae816433f886d88213Mike Stump Block->addSuccessor(&cfg->getExit()); 5254f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek 5262455636163fdd18581d7fdae816433f886d88213Mike Stump return VisitChildren(C); 527d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek} 528d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek 5293fc8ef574cdc09c613c329ee511852d219263c15Ted KremenekCFGBlock *CFGBuilder::VisitChooseExpr(ChooseExpr *C) { 5303fc8ef574cdc09c613c329ee511852d219263c15Ted Kremenek CFGBlock* ConfluenceBlock = Block ? Block : createBlock(); 5313fc8ef574cdc09c613c329ee511852d219263c15Ted Kremenek ConfluenceBlock->appendStmt(C); 5323fc8ef574cdc09c613c329ee511852d219263c15Ted Kremenek if (!FinishBlock(ConfluenceBlock)) 5333fc8ef574cdc09c613c329ee511852d219263c15Ted Kremenek return 0; 5343fc8ef574cdc09c613c329ee511852d219263c15Ted Kremenek 5353fc8ef574cdc09c613c329ee511852d219263c15Ted Kremenek Succ = ConfluenceBlock; 5363fc8ef574cdc09c613c329ee511852d219263c15Ted Kremenek Block = NULL; 5374f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek CFGBlock* LHSBlock = addStmt(C->getLHS()); 5383fc8ef574cdc09c613c329ee511852d219263c15Ted Kremenek if (!FinishBlock(LHSBlock)) 5393fc8ef574cdc09c613c329ee511852d219263c15Ted Kremenek return 0; 5403fc8ef574cdc09c613c329ee511852d219263c15Ted Kremenek 5413fc8ef574cdc09c613c329ee511852d219263c15Ted Kremenek Succ = ConfluenceBlock; 5423fc8ef574cdc09c613c329ee511852d219263c15Ted Kremenek Block = NULL; 5434f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek CFGBlock* RHSBlock = addStmt(C->getRHS()); 5443fc8ef574cdc09c613c329ee511852d219263c15Ted Kremenek if (!FinishBlock(RHSBlock)) 5453fc8ef574cdc09c613c329ee511852d219263c15Ted Kremenek return 0; 5463fc8ef574cdc09c613c329ee511852d219263c15Ted Kremenek 5473fc8ef574cdc09c613c329ee511852d219263c15Ted Kremenek Block = createBlock(false); 54800998a068e50945118f334c98af05ed44d7c22a6Mike Stump // See if this is a known constant. 549941fde8019d47c694b8483db45d5878818fa69d1Ted Kremenek const TryResult& KnownVal = TryEvaluateBool(C->getCond()); 550941fde8019d47c694b8483db45d5878818fa69d1Ted Kremenek Block->addSuccessor(KnownVal.isFalse() ? NULL : LHSBlock); 551941fde8019d47c694b8483db45d5878818fa69d1Ted Kremenek Block->addSuccessor(KnownVal.isTrue() ? NULL : RHSBlock); 5523fc8ef574cdc09c613c329ee511852d219263c15Ted Kremenek Block->setTerminator(C); 5533fc8ef574cdc09c613c329ee511852d219263c15Ted Kremenek return addStmt(C->getCond()); 5543fc8ef574cdc09c613c329ee511852d219263c15Ted Kremenek} 555f34bb2eaa87aa28bcc8b6ff0dfc696cd75605b11Ted Kremenek 5564f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek 5574f88063677a2d990a44bb0d5f8437d2498b91d7fTed KremenekCFGBlock* CFGBuilder::VisitCompoundStmt(CompoundStmt* C) { 5584f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek CFGBlock* LastBlock = Block; 5594f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek 5604f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek for (CompoundStmt::reverse_body_iterator I=C->body_rbegin(), E=C->body_rend(); 5614f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek I != E; ++I ) { 5624f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek LastBlock = addStmt(*I); 563e8d6d2b9a2c5d3f0e7e0f88f54f1711bbc6c6f78Ted Kremenek 564e8d6d2b9a2c5d3f0e7e0f88f54f1711bbc6c6f78Ted Kremenek if (badCFG) 565e8d6d2b9a2c5d3f0e7e0f88f54f1711bbc6c6f78Ted Kremenek return NULL; 5664f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek } 5674f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek return LastBlock; 5684f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek} 5694f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek 570f34bb2eaa87aa28bcc8b6ff0dfc696cd75605b11Ted KremenekCFGBlock *CFGBuilder::VisitConditionalOperator(ConditionalOperator *C) { 571f34bb2eaa87aa28bcc8b6ff0dfc696cd75605b11Ted Kremenek // Create the confluence block that will "merge" the results of the ternary 572f34bb2eaa87aa28bcc8b6ff0dfc696cd75605b11Ted Kremenek // expression. 573f34bb2eaa87aa28bcc8b6ff0dfc696cd75605b11Ted Kremenek CFGBlock* ConfluenceBlock = Block ? Block : createBlock(); 574f34bb2eaa87aa28bcc8b6ff0dfc696cd75605b11Ted Kremenek ConfluenceBlock->appendStmt(C); 575f34bb2eaa87aa28bcc8b6ff0dfc696cd75605b11Ted Kremenek if (!FinishBlock(ConfluenceBlock)) 576f34bb2eaa87aa28bcc8b6ff0dfc696cd75605b11Ted Kremenek return 0; 577f34bb2eaa87aa28bcc8b6ff0dfc696cd75605b11Ted Kremenek 578f34bb2eaa87aa28bcc8b6ff0dfc696cd75605b11Ted Kremenek // Create a block for the LHS expression if there is an LHS expression. A 579f34bb2eaa87aa28bcc8b6ff0dfc696cd75605b11Ted Kremenek // GCC extension allows LHS to be NULL, causing the condition to be the 580f34bb2eaa87aa28bcc8b6ff0dfc696cd75605b11Ted Kremenek // value that is returned instead. 581f34bb2eaa87aa28bcc8b6ff0dfc696cd75605b11Ted Kremenek // e.g: x ?: y is shorthand for: x ? x : y; 582f34bb2eaa87aa28bcc8b6ff0dfc696cd75605b11Ted Kremenek Succ = ConfluenceBlock; 583f34bb2eaa87aa28bcc8b6ff0dfc696cd75605b11Ted Kremenek Block = NULL; 584f34bb2eaa87aa28bcc8b6ff0dfc696cd75605b11Ted Kremenek CFGBlock* LHSBlock = NULL; 585f34bb2eaa87aa28bcc8b6ff0dfc696cd75605b11Ted Kremenek if (C->getLHS()) { 5864f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek LHSBlock = addStmt(C->getLHS()); 587f34bb2eaa87aa28bcc8b6ff0dfc696cd75605b11Ted Kremenek if (!FinishBlock(LHSBlock)) 588f34bb2eaa87aa28bcc8b6ff0dfc696cd75605b11Ted Kremenek return 0; 589f34bb2eaa87aa28bcc8b6ff0dfc696cd75605b11Ted Kremenek Block = NULL; 590f34bb2eaa87aa28bcc8b6ff0dfc696cd75605b11Ted Kremenek } 591f34bb2eaa87aa28bcc8b6ff0dfc696cd75605b11Ted Kremenek 592f34bb2eaa87aa28bcc8b6ff0dfc696cd75605b11Ted Kremenek // Create the block for the RHS expression. 593f34bb2eaa87aa28bcc8b6ff0dfc696cd75605b11Ted Kremenek Succ = ConfluenceBlock; 5944f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek CFGBlock* RHSBlock = addStmt(C->getRHS()); 595f34bb2eaa87aa28bcc8b6ff0dfc696cd75605b11Ted Kremenek if (!FinishBlock(RHSBlock)) 596f34bb2eaa87aa28bcc8b6ff0dfc696cd75605b11Ted Kremenek return 0; 597f34bb2eaa87aa28bcc8b6ff0dfc696cd75605b11Ted Kremenek 598f34bb2eaa87aa28bcc8b6ff0dfc696cd75605b11Ted Kremenek // Create the block that will contain the condition. 599f34bb2eaa87aa28bcc8b6ff0dfc696cd75605b11Ted Kremenek Block = createBlock(false); 600f34bb2eaa87aa28bcc8b6ff0dfc696cd75605b11Ted Kremenek 60100998a068e50945118f334c98af05ed44d7c22a6Mike Stump // See if this is a known constant. 602941fde8019d47c694b8483db45d5878818fa69d1Ted Kremenek const TryResult& KnownVal = TryEvaluateBool(C->getCond()); 603e5af3ce53ec58995b09381ba645ab2117a46647bMike Stump if (LHSBlock) { 604941fde8019d47c694b8483db45d5878818fa69d1Ted Kremenek Block->addSuccessor(KnownVal.isFalse() ? NULL : LHSBlock); 605e5af3ce53ec58995b09381ba645ab2117a46647bMike Stump } else { 606941fde8019d47c694b8483db45d5878818fa69d1Ted Kremenek if (KnownVal.isFalse()) { 607e5af3ce53ec58995b09381ba645ab2117a46647bMike Stump // If we know the condition is false, add NULL as the successor for 608e5af3ce53ec58995b09381ba645ab2117a46647bMike Stump // the block containing the condition. In this case, the confluence 609e5af3ce53ec58995b09381ba645ab2117a46647bMike Stump // block will have just one predecessor. 610e5af3ce53ec58995b09381ba645ab2117a46647bMike Stump Block->addSuccessor(0); 611941fde8019d47c694b8483db45d5878818fa69d1Ted Kremenek assert(ConfluenceBlock->pred_size() == 1); 612e5af3ce53ec58995b09381ba645ab2117a46647bMike Stump } else { 613e5af3ce53ec58995b09381ba645ab2117a46647bMike Stump // If we have no LHS expression, add the ConfluenceBlock as a direct 614e5af3ce53ec58995b09381ba645ab2117a46647bMike Stump // successor for the block containing the condition. Moreover, we need to 615e5af3ce53ec58995b09381ba645ab2117a46647bMike Stump // reverse the order of the predecessors in the ConfluenceBlock because 616e5af3ce53ec58995b09381ba645ab2117a46647bMike Stump // the RHSBlock will have been added to the succcessors already, and we 617e5af3ce53ec58995b09381ba645ab2117a46647bMike Stump // want the first predecessor to the the block containing the expression 618e5af3ce53ec58995b09381ba645ab2117a46647bMike Stump // for the case when the ternary expression evaluates to true. 619e5af3ce53ec58995b09381ba645ab2117a46647bMike Stump Block->addSuccessor(ConfluenceBlock); 620941fde8019d47c694b8483db45d5878818fa69d1Ted Kremenek assert(ConfluenceBlock->pred_size() == 2); 621e5af3ce53ec58995b09381ba645ab2117a46647bMike Stump std::reverse(ConfluenceBlock->pred_begin(), 622e5af3ce53ec58995b09381ba645ab2117a46647bMike Stump ConfluenceBlock->pred_end()); 623e5af3ce53ec58995b09381ba645ab2117a46647bMike Stump } 624f34bb2eaa87aa28bcc8b6ff0dfc696cd75605b11Ted Kremenek } 625f34bb2eaa87aa28bcc8b6ff0dfc696cd75605b11Ted Kremenek 626941fde8019d47c694b8483db45d5878818fa69d1Ted Kremenek Block->addSuccessor(KnownVal.isTrue() ? NULL : RHSBlock); 627f34bb2eaa87aa28bcc8b6ff0dfc696cd75605b11Ted Kremenek Block->setTerminator(C); 628f34bb2eaa87aa28bcc8b6ff0dfc696cd75605b11Ted Kremenek return addStmt(C->getCond()); 629f34bb2eaa87aa28bcc8b6ff0dfc696cd75605b11Ted Kremenek} 630f34bb2eaa87aa28bcc8b6ff0dfc696cd75605b11Ted Kremenek 6314f88063677a2d990a44bb0d5f8437d2498b91d7fTed KremenekCFGBlock *CFGBuilder::VisitDeclStmt(DeclStmt *DS) { 6324f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek autoCreateBlock(); 6336d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 6344f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek if (DS->isSingleDecl()) { 6354f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek Block->appendStmt(DS); 6364f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek return VisitDeclSubExpr(DS->getSingleDecl()); 637d34066c224f782056c18f154abe04ef590473fd9Ted Kremenek } 6384f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek 6394f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek CFGBlock *B = 0; 6404f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek 6414f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek // FIXME: Add a reverse iterator for DeclStmt to avoid this extra copy. 6424f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek typedef llvm::SmallVector<Decl*,10> BufTy; 6434f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek BufTy Buf(DS->decl_begin(), DS->decl_end()); 6444f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek 6454f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek for (BufTy::reverse_iterator I = Buf.rbegin(), E = Buf.rend(); I != E; ++I) { 6464f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek // Get the alignment of the new DeclStmt, padding out to >=8 bytes. 6474f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek unsigned A = llvm::AlignOf<DeclStmt>::Alignment < 8 6484f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek ? 8 : llvm::AlignOf<DeclStmt>::Alignment; 6494f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek 6504f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek // Allocate the DeclStmt using the BumpPtrAllocator. It will get 6514f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek // automatically freed with the CFG. 6524f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek DeclGroupRef DG(*I); 6534f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek Decl *D = *I; 6544f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek void *Mem = cfg->getAllocator().Allocate(sizeof(DeclStmt), A); 6554f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek DeclStmt *DSNew = new (Mem) DeclStmt(DG, D->getLocation(), GetEndLoc(D)); 6564f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek 6574f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek // Append the fake DeclStmt to block. 6584f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek Block->appendStmt(DSNew); 6594f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek B = VisitDeclSubExpr(D); 6604f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek } 6614f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek 6624f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek return B; 6634f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek} 6644f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek 6654f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek/// VisitDeclSubExpr - Utility method to add block-level expressions for 6664f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek/// initializers in Decls. 6674f88063677a2d990a44bb0d5f8437d2498b91d7fTed KremenekCFGBlock *CFGBuilder::VisitDeclSubExpr(Decl* D) { 6684f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek assert(Block); 669d34066c224f782056c18f154abe04ef590473fd9Ted Kremenek 6704f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek VarDecl *VD = dyn_cast<VarDecl>(D); 6714f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek 6724f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek if (!VD) 6734f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek return Block; 6744f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek 6754f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek Expr *Init = VD->getInit(); 6764f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek 6774f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek if (Init) { 6784f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek // Optimization: Don't create separate block-level statements for literals. 6794f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek switch (Init->getStmtClass()) { 6804f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek case Stmt::IntegerLiteralClass: 6814f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek case Stmt::CharacterLiteralClass: 6824f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek case Stmt::StringLiteralClass: 6834f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek break; 6844f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek default: 6854f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek Block = addStmt(Init); 6864f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek } 6874f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek } 6884f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek 6894f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek // If the type of VD is a VLA, then we must process its size expressions. 6904f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek for (VariableArrayType* VA = FindVA(VD->getType().getTypePtr()); VA != 0; 6914f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek VA = FindVA(VA->getElementType().getTypePtr())) 6924f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek Block = addStmt(VA->getSizeExpr()); 6934f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek 6944f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek return Block; 695d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek} 696fddd51853f8ccaa1df2476376e6fd74d2f315c73Ted Kremenek 697d4fdee35477e439759eea5f67ea03ff0c570fabaTed KremenekCFGBlock* CFGBuilder::VisitIfStmt(IfStmt* I) { 6986d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // We may see an if statement in the middle of a basic block, or it may be the 6996d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // first statement we are processing. In either case, we create a new basic 7006d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // block. First, we create the blocks for the then...else statements, and 7016d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // then we create the block containing the if statement. If we were in the 7026d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // middle of a block, we stop processing that block and reverse its 7036d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // statements. That block is then the implicit successor for the "then" and 7046d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // "else" clauses. 7056d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 7066d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // The block we were proccessing is now finished. Make it the successor 7076d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // block. 7086d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump if (Block) { 709d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek Succ = Block; 7104e8df2eb7072db8f66572c3db31a2a08b12a752eTed Kremenek if (!FinishBlock(Block)) 7114e8df2eb7072db8f66572c3db31a2a08b12a752eTed Kremenek return 0; 712c310e933a9b023a280f3aa02e5a0c75398555e13Ted Kremenek } 7136d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 714b6f1d782e0dc5fad138a17e6aa0ff6f9bc4788c6Ted Kremenek // Process the false branch. 715d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek CFGBlock* ElseBlock = Succ; 7166d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 717d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek if (Stmt* Else = I->getElse()) { 718d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek SaveAndRestore<CFGBlock*> sv(Succ); 7196d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 720d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek // NULL out Block so that the recursive call to Visit will 7216d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // create a new basic block. 722d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek Block = NULL; 7234f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek ElseBlock = addStmt(Else); 7246d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 725b6f7b72047b3fd3f96a5040e1e4d520a9dea01cdTed Kremenek if (!ElseBlock) // Can occur when the Else body has all NullStmts. 726b6f7b72047b3fd3f96a5040e1e4d520a9dea01cdTed Kremenek ElseBlock = sv.get(); 7274e8df2eb7072db8f66572c3db31a2a08b12a752eTed Kremenek else if (Block) { 7284e8df2eb7072db8f66572c3db31a2a08b12a752eTed Kremenek if (!FinishBlock(ElseBlock)) 7294e8df2eb7072db8f66572c3db31a2a08b12a752eTed Kremenek return 0; 7304e8df2eb7072db8f66572c3db31a2a08b12a752eTed Kremenek } 731c310e933a9b023a280f3aa02e5a0c75398555e13Ted Kremenek } 7326d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 733b6f1d782e0dc5fad138a17e6aa0ff6f9bc4788c6Ted Kremenek // Process the true branch. 734d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek CFGBlock* ThenBlock; 735d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek { 736d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek Stmt* Then = I->getThen(); 737d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek assert (Then); 738d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek SaveAndRestore<CFGBlock*> sv(Succ); 7396d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump Block = NULL; 7404f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek ThenBlock = addStmt(Then); 7416d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 742dbdf7949a7a50f5a65055a3e95f6432ecc541056Ted Kremenek if (!ThenBlock) { 743dbdf7949a7a50f5a65055a3e95f6432ecc541056Ted Kremenek // We can reach here if the "then" body has all NullStmts. 744dbdf7949a7a50f5a65055a3e95f6432ecc541056Ted Kremenek // Create an empty block so we can distinguish between true and false 745dbdf7949a7a50f5a65055a3e95f6432ecc541056Ted Kremenek // branches in path-sensitive analyses. 746dbdf7949a7a50f5a65055a3e95f6432ecc541056Ted Kremenek ThenBlock = createBlock(false); 747dbdf7949a7a50f5a65055a3e95f6432ecc541056Ted Kremenek ThenBlock->addSuccessor(sv.get()); 7486d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump } else if (Block) { 7494e8df2eb7072db8f66572c3db31a2a08b12a752eTed Kremenek if (!FinishBlock(ThenBlock)) 7504e8df2eb7072db8f66572c3db31a2a08b12a752eTed Kremenek return 0; 7516d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump } 7520cebe3e29b22d11f2c65ef28fcfb5f0431877266Ted Kremenek } 753d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek 7546d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // Now create a new block containing the if statement. 755d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek Block = createBlock(false); 7566d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 757d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek // Set the terminator of the new block to the If statement. 758d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek Block->setTerminator(I); 7596d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 76000998a068e50945118f334c98af05ed44d7c22a6Mike Stump // See if this is a known constant. 761941fde8019d47c694b8483db45d5878818fa69d1Ted Kremenek const TryResult &KnownVal = TryEvaluateBool(I->getCond()); 76200998a068e50945118f334c98af05ed44d7c22a6Mike Stump 763d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek // Now add the successors. 764941fde8019d47c694b8483db45d5878818fa69d1Ted Kremenek Block->addSuccessor(KnownVal.isFalse() ? NULL : ThenBlock); 765941fde8019d47c694b8483db45d5878818fa69d1Ted Kremenek Block->addSuccessor(KnownVal.isTrue()? NULL : ElseBlock); 7666d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 7676d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // Add the condition as the last statement in the new block. This may create 7686d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // new blocks as the condition may contain control-flow. Any newly created 7696d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // blocks will be pointed to be "Block". 7704f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek return addStmt(I->getCond()); 771d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek} 7726d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 7736d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 774d4fdee35477e439759eea5f67ea03ff0c570fabaTed KremenekCFGBlock* CFGBuilder::VisitReturnStmt(ReturnStmt* R) { 7756d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // If we were in the middle of a block we stop processing that block and 7766d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // reverse its statements. 777d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek // 7786d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // NOTE: If a "return" appears in the middle of a block, this means that the 7796d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // code afterwards is DEAD (unreachable). We still keep a basic block 7806d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // for that code; a simple "mark-and-sweep" from the entry block will be 7816d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // able to report such dead blocks. 782d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek if (Block) FinishBlock(Block); 783d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek 784d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek // Create the new block. 785d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek Block = createBlock(false); 7866d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 787d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek // The Exit block is the only successor. 788d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek Block->addSuccessor(&cfg->getExit()); 7896d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 7906d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // Add the return statement to the block. This may create new blocks if R 7916d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // contains control-flow (short-circuit operations). 7924f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek return VisitStmt(R, true); 793d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek} 7940cebe3e29b22d11f2c65ef28fcfb5f0431877266Ted Kremenek 795d4fdee35477e439759eea5f67ea03ff0c570fabaTed KremenekCFGBlock* CFGBuilder::VisitLabelStmt(LabelStmt* L) { 796d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek // Get the block of the labeled statement. Add it to our map. 7974f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek addStmt(L->getSubStmt()); 7982677ea871a25aa79f9db360f6ed10584c02267adTed Kremenek CFGBlock* LabelBlock = Block; 7996d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 8004f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek if (!LabelBlock) // This can happen when the body is empty, i.e. 8014f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek LabelBlock = createBlock(); // scopes that only contains NullStmts. 8026d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 8034f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek assert(LabelMap.find(L) == LabelMap.end() && "label already in map"); 804d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek LabelMap[ L ] = LabelBlock; 8056d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 8066d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // Labels partition blocks, so this is the end of the basic block we were 8076d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // processing (L is the block's label). Because this is label (and we have 8086d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // already processed the substatement) there is no extra control-flow to worry 8096d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // about. 8109cffe7366ea3beb33c2d58f43a8c3a04c1873e11Ted Kremenek LabelBlock->setLabel(L); 8114e8df2eb7072db8f66572c3db31a2a08b12a752eTed Kremenek if (!FinishBlock(LabelBlock)) 8124e8df2eb7072db8f66572c3db31a2a08b12a752eTed Kremenek return 0; 8136d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 8146d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // We set Block to NULL to allow lazy creation of a new block (if necessary); 815d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek Block = NULL; 8166d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 817d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek // This block is now the implicit successor of other blocks. 818d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek Succ = LabelBlock; 8196d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 820d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek return LabelBlock; 821d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek} 82231dcd3c8c4df5a656f58f50ea73afc177c101c67Ted Kremenek 823d4fdee35477e439759eea5f67ea03ff0c570fabaTed KremenekCFGBlock* CFGBuilder::VisitGotoStmt(GotoStmt* G) { 8246d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // Goto is a control-flow statement. Thus we stop processing the current 8256d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // block and create a new one. 8264f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek if (Block) 8274f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek FinishBlock(Block); 8284f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek 829d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek Block = createBlock(false); 830d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek Block->setTerminator(G); 8316d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 8326d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // If we already know the mapping to the label block add the successor now. 833d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek LabelMapTy::iterator I = LabelMap.find(G->getLabel()); 8346d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 835d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek if (I == LabelMap.end()) 836d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek // We will need to backpatch this block later. 837d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek BackpatchBlocks.push_back(Block); 838d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek else 839d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek Block->addSuccessor(I->second); 840d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek 8416d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump return Block; 842d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek} 843d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek 844d4fdee35477e439759eea5f67ea03ff0c570fabaTed KremenekCFGBlock* CFGBuilder::VisitForStmt(ForStmt* F) { 845d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek CFGBlock* LoopSuccessor = NULL; 8466d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 847fefb9f7009702befaf715e7a8debc9505c3c8634Mike Stump // "for" is a control-flow statement. Thus we stop processing the current 848fefb9f7009702befaf715e7a8debc9505c3c8634Mike Stump // block. 849d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek if (Block) { 8504e8df2eb7072db8f66572c3db31a2a08b12a752eTed Kremenek if (!FinishBlock(Block)) 8514e8df2eb7072db8f66572c3db31a2a08b12a752eTed Kremenek return 0; 852d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek LoopSuccessor = Block; 8534f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek } else 8544f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek LoopSuccessor = Succ; 8556d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 8566d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // Because of short-circuit evaluation, the condition of the loop can span 8576d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // multiple basic blocks. Thus we need the "Entry" and "Exit" blocks that 8586d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // evaluate the condition. 85949af7cb8a3aca79783e7a0708b97a8f856f0da22Ted Kremenek CFGBlock* ExitConditionBlock = createBlock(false); 86049af7cb8a3aca79783e7a0708b97a8f856f0da22Ted Kremenek CFGBlock* EntryConditionBlock = ExitConditionBlock; 8616d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 86249af7cb8a3aca79783e7a0708b97a8f856f0da22Ted Kremenek // Set the terminator for the "exit" condition block. 8636d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump ExitConditionBlock->setTerminator(F); 8646d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 8656d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // Now add the actual condition to the condition block. Because the condition 8666d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // itself may contain control-flow, new blocks may be created. 86749af7cb8a3aca79783e7a0708b97a8f856f0da22Ted Kremenek if (Stmt* C = F->getCond()) { 86849af7cb8a3aca79783e7a0708b97a8f856f0da22Ted Kremenek Block = ExitConditionBlock; 86949af7cb8a3aca79783e7a0708b97a8f856f0da22Ted Kremenek EntryConditionBlock = addStmt(C); 8704e8df2eb7072db8f66572c3db31a2a08b12a752eTed Kremenek if (Block) { 8714e8df2eb7072db8f66572c3db31a2a08b12a752eTed Kremenek if (!FinishBlock(EntryConditionBlock)) 8724e8df2eb7072db8f66572c3db31a2a08b12a752eTed Kremenek return 0; 8734e8df2eb7072db8f66572c3db31a2a08b12a752eTed Kremenek } 87449af7cb8a3aca79783e7a0708b97a8f856f0da22Ted Kremenek } 875d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek 8766d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // The condition block is the implicit successor for the loop body as well as 8776d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // any code above the loop. 87849af7cb8a3aca79783e7a0708b97a8f856f0da22Ted Kremenek Succ = EntryConditionBlock; 8796d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 88000998a068e50945118f334c98af05ed44d7c22a6Mike Stump // See if this is a known constant. 881941fde8019d47c694b8483db45d5878818fa69d1Ted Kremenek TryResult KnownVal(true); 882941fde8019d47c694b8483db45d5878818fa69d1Ted Kremenek 88300998a068e50945118f334c98af05ed44d7c22a6Mike Stump if (F->getCond()) 88400998a068e50945118f334c98af05ed44d7c22a6Mike Stump KnownVal = TryEvaluateBool(F->getCond()); 88500998a068e50945118f334c98af05ed44d7c22a6Mike Stump 886d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek // Now create the loop body. 887d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek { 888d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek assert (F->getBody()); 8896d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 890d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek // Save the current values for Block, Succ, and continue and break targets 891d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek SaveAndRestore<CFGBlock*> save_Block(Block), save_Succ(Succ), 892d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek save_continue(ContinueTargetBlock), 8936d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump save_break(BreakTargetBlock); 8946d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 895af603f742491dc4707138c0293d295171fdd51baTed Kremenek // Create a new block to contain the (bottom) of the loop body. 896af603f742491dc4707138c0293d295171fdd51baTed Kremenek Block = NULL; 8976d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 898e933450535ab077b95e59f929a4ccb25b6f360e6Ted Kremenek if (Stmt* I = F->getInc()) { 8996d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // Generate increment code in its own basic block. This is the target of 9006d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // continue statements. 9014f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek Succ = addStmt(I); 9026d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump } else { 9036d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // No increment code. Create a special, empty, block that is used as the 9046d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // target block for "looping back" to the start of the loop. 9053575f84e459033d6427b84b4b795b22c85c4d27dTed Kremenek assert(Succ == EntryConditionBlock); 9063575f84e459033d6427b84b4b795b22c85c4d27dTed Kremenek Succ = createBlock(); 907e933450535ab077b95e59f929a4ccb25b6f360e6Ted Kremenek } 9086d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 9093575f84e459033d6427b84b4b795b22c85c4d27dTed Kremenek // Finish up the increment (or empty) block if it hasn't been already. 9103575f84e459033d6427b84b4b795b22c85c4d27dTed Kremenek if (Block) { 9113575f84e459033d6427b84b4b795b22c85c4d27dTed Kremenek assert(Block == Succ); 9124e8df2eb7072db8f66572c3db31a2a08b12a752eTed Kremenek if (!FinishBlock(Block)) 9134e8df2eb7072db8f66572c3db31a2a08b12a752eTed Kremenek return 0; 9143575f84e459033d6427b84b4b795b22c85c4d27dTed Kremenek Block = 0; 9153575f84e459033d6427b84b4b795b22c85c4d27dTed Kremenek } 9166d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 9173575f84e459033d6427b84b4b795b22c85c4d27dTed Kremenek ContinueTargetBlock = Succ; 9186d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 9193575f84e459033d6427b84b4b795b22c85c4d27dTed Kremenek // The starting block for the loop increment is the block that should 9203575f84e459033d6427b84b4b795b22c85c4d27dTed Kremenek // represent the 'loop target' for looping back to the start of the loop. 9213575f84e459033d6427b84b4b795b22c85c4d27dTed Kremenek ContinueTargetBlock->setLoopTarget(F); 9223575f84e459033d6427b84b4b795b22c85c4d27dTed Kremenek 923e933450535ab077b95e59f929a4ccb25b6f360e6Ted Kremenek // All breaks should go to the code following the loop. 9246d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump BreakTargetBlock = LoopSuccessor; 9256d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 9266d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // Now populate the body block, and in the process create new blocks as we 9276d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // walk the body of the loop. 9284f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek CFGBlock* BodyBlock = addStmt(F->getBody()); 929af603f742491dc4707138c0293d295171fdd51baTed Kremenek 930af603f742491dc4707138c0293d295171fdd51baTed Kremenek if (!BodyBlock) 9311d4b218fa55239f2a7350f48be14090d2753c22cZhongxing Xu BodyBlock = ContinueTargetBlock; // can happen for "for (...;...;...) ;" 932941fde8019d47c694b8483db45d5878818fa69d1Ted Kremenek else if (Block && !FinishBlock(BodyBlock)) 933941fde8019d47c694b8483db45d5878818fa69d1Ted Kremenek return 0; 9346d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 935941fde8019d47c694b8483db45d5878818fa69d1Ted Kremenek // This new body block is a successor to our "exit" condition block. 936941fde8019d47c694b8483db45d5878818fa69d1Ted Kremenek ExitConditionBlock->addSuccessor(KnownVal.isFalse() ? NULL : BodyBlock); 937d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek } 9386d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 939941fde8019d47c694b8483db45d5878818fa69d1Ted Kremenek // Link up the condition block with the code that follows the loop. (the 940941fde8019d47c694b8483db45d5878818fa69d1Ted Kremenek // false branch). 941941fde8019d47c694b8483db45d5878818fa69d1Ted Kremenek ExitConditionBlock->addSuccessor(KnownVal.isTrue() ? NULL : LoopSuccessor); 9426d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 943d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek // If the loop contains initialization, create a new block for those 9446d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // statements. This block can also contain statements that precede the loop. 945d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek if (Stmt* I = F->getInit()) { 946d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek Block = createBlock(); 94749af7cb8a3aca79783e7a0708b97a8f856f0da22Ted Kremenek return addStmt(I); 9486d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump } else { 9496d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // There is no loop initialization. We are thus basically a while loop. 9506d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // NULL out Block to force lazy block construction. 9512bac4ea765a4a6e1f6149964663f62d4bca6743bTed Kremenek Block = NULL; 9525482713d70ecbfe608940018046aa248b3d03443Ted Kremenek Succ = EntryConditionBlock; 95349af7cb8a3aca79783e7a0708b97a8f856f0da22Ted Kremenek return EntryConditionBlock; 9542bac4ea765a4a6e1f6149964663f62d4bca6743bTed Kremenek } 955d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek} 956d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek 957514de5a21645900c92cf4f4f7313d6f66945d134Ted KremenekCFGBlock* CFGBuilder::VisitObjCForCollectionStmt(ObjCForCollectionStmt* S) { 958514de5a21645900c92cf4f4f7313d6f66945d134Ted Kremenek // Objective-C fast enumeration 'for' statements: 959514de5a21645900c92cf4f4f7313d6f66945d134Ted Kremenek // http://developer.apple.com/documentation/Cocoa/Conceptual/ObjectiveC 960514de5a21645900c92cf4f4f7313d6f66945d134Ted Kremenek // 961514de5a21645900c92cf4f4f7313d6f66945d134Ted Kremenek // for ( Type newVariable in collection_expression ) { statements } 962514de5a21645900c92cf4f4f7313d6f66945d134Ted Kremenek // 963514de5a21645900c92cf4f4f7313d6f66945d134Ted Kremenek // becomes: 964514de5a21645900c92cf4f4f7313d6f66945d134Ted Kremenek // 965514de5a21645900c92cf4f4f7313d6f66945d134Ted Kremenek // prologue: 966514de5a21645900c92cf4f4f7313d6f66945d134Ted Kremenek // 1. collection_expression 967514de5a21645900c92cf4f4f7313d6f66945d134Ted Kremenek // T. jump to loop_entry 968514de5a21645900c92cf4f4f7313d6f66945d134Ted Kremenek // loop_entry: 9694cb3a855df3b3f8d551565cae9f43939a301ea89Ted Kremenek // 1. side-effects of element expression 970514de5a21645900c92cf4f4f7313d6f66945d134Ted Kremenek // 1. ObjCForCollectionStmt [performs binding to newVariable] 971514de5a21645900c92cf4f4f7313d6f66945d134Ted Kremenek // T. ObjCForCollectionStmt TB, FB [jumps to TB if newVariable != nil] 972514de5a21645900c92cf4f4f7313d6f66945d134Ted Kremenek // TB: 973514de5a21645900c92cf4f4f7313d6f66945d134Ted Kremenek // statements 974514de5a21645900c92cf4f4f7313d6f66945d134Ted Kremenek // T. jump to loop_entry 975514de5a21645900c92cf4f4f7313d6f66945d134Ted Kremenek // FB: 976514de5a21645900c92cf4f4f7313d6f66945d134Ted Kremenek // what comes after 977514de5a21645900c92cf4f4f7313d6f66945d134Ted Kremenek // 978514de5a21645900c92cf4f4f7313d6f66945d134Ted Kremenek // and 979514de5a21645900c92cf4f4f7313d6f66945d134Ted Kremenek // 980514de5a21645900c92cf4f4f7313d6f66945d134Ted Kremenek // Type existingItem; 981514de5a21645900c92cf4f4f7313d6f66945d134Ted Kremenek // for ( existingItem in expression ) { statements } 982514de5a21645900c92cf4f4f7313d6f66945d134Ted Kremenek // 983514de5a21645900c92cf4f4f7313d6f66945d134Ted Kremenek // becomes: 984514de5a21645900c92cf4f4f7313d6f66945d134Ted Kremenek // 9856d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // the same with newVariable replaced with existingItem; the binding works 9866d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // the same except that for one ObjCForCollectionStmt::getElement() returns 9876d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // a DeclStmt and the other returns a DeclRefExpr. 988514de5a21645900c92cf4f4f7313d6f66945d134Ted Kremenek // 9896d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 990514de5a21645900c92cf4f4f7313d6f66945d134Ted Kremenek CFGBlock* LoopSuccessor = 0; 9916d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 992514de5a21645900c92cf4f4f7313d6f66945d134Ted Kremenek if (Block) { 9934e8df2eb7072db8f66572c3db31a2a08b12a752eTed Kremenek if (!FinishBlock(Block)) 9944e8df2eb7072db8f66572c3db31a2a08b12a752eTed Kremenek return 0; 995514de5a21645900c92cf4f4f7313d6f66945d134Ted Kremenek LoopSuccessor = Block; 996514de5a21645900c92cf4f4f7313d6f66945d134Ted Kremenek Block = 0; 9974f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek } else 9984f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek LoopSuccessor = Succ; 9996d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 10004cb3a855df3b3f8d551565cae9f43939a301ea89Ted Kremenek // Build the condition blocks. 10014cb3a855df3b3f8d551565cae9f43939a301ea89Ted Kremenek CFGBlock* ExitConditionBlock = createBlock(false); 10024cb3a855df3b3f8d551565cae9f43939a301ea89Ted Kremenek CFGBlock* EntryConditionBlock = ExitConditionBlock; 10036d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 10044cb3a855df3b3f8d551565cae9f43939a301ea89Ted Kremenek // Set the terminator for the "exit" condition block. 10056d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump ExitConditionBlock->setTerminator(S); 10066d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 10076d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // The last statement in the block should be the ObjCForCollectionStmt, which 10086d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // performs the actual binding to 'element' and determines if there are any 10096d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // more items in the collection. 10104cb3a855df3b3f8d551565cae9f43939a301ea89Ted Kremenek ExitConditionBlock->appendStmt(S); 10114cb3a855df3b3f8d551565cae9f43939a301ea89Ted Kremenek Block = ExitConditionBlock; 10126d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 10134cb3a855df3b3f8d551565cae9f43939a301ea89Ted Kremenek // Walk the 'element' expression to see if there are any side-effects. We 10146d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // generate new blocks as necesary. We DON'T add the statement by default to 10156d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // the CFG unless it contains control-flow. 10164f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek EntryConditionBlock = Visit(S->getElement(), false); 10176d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump if (Block) { 10184e8df2eb7072db8f66572c3db31a2a08b12a752eTed Kremenek if (!FinishBlock(EntryConditionBlock)) 10194e8df2eb7072db8f66572c3db31a2a08b12a752eTed Kremenek return 0; 10204e8df2eb7072db8f66572c3db31a2a08b12a752eTed Kremenek Block = 0; 10214e8df2eb7072db8f66572c3db31a2a08b12a752eTed Kremenek } 10226d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 10236d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // The condition block is the implicit successor for the loop body as well as 10246d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // any code above the loop. 10254cb3a855df3b3f8d551565cae9f43939a301ea89Ted Kremenek Succ = EntryConditionBlock; 10266d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 10274cb3a855df3b3f8d551565cae9f43939a301ea89Ted Kremenek // Now create the true branch. 10286d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump { 10294cb3a855df3b3f8d551565cae9f43939a301ea89Ted Kremenek // Save the current values for Succ, continue and break targets. 10304cb3a855df3b3f8d551565cae9f43939a301ea89Ted Kremenek SaveAndRestore<CFGBlock*> save_Succ(Succ), 10316d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump save_continue(ContinueTargetBlock), save_break(BreakTargetBlock); 10326d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 10334cb3a855df3b3f8d551565cae9f43939a301ea89Ted Kremenek BreakTargetBlock = LoopSuccessor; 10346d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump ContinueTargetBlock = EntryConditionBlock; 10356d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 10364f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek CFGBlock* BodyBlock = addStmt(S->getBody()); 10376d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 10384cb3a855df3b3f8d551565cae9f43939a301ea89Ted Kremenek if (!BodyBlock) 10394cb3a855df3b3f8d551565cae9f43939a301ea89Ted Kremenek BodyBlock = EntryConditionBlock; // can happen for "for (X in Y) ;" 10404e8df2eb7072db8f66572c3db31a2a08b12a752eTed Kremenek else if (Block) { 10414e8df2eb7072db8f66572c3db31a2a08b12a752eTed Kremenek if (!FinishBlock(BodyBlock)) 10424e8df2eb7072db8f66572c3db31a2a08b12a752eTed Kremenek return 0; 10434e8df2eb7072db8f66572c3db31a2a08b12a752eTed Kremenek } 10446d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 10454cb3a855df3b3f8d551565cae9f43939a301ea89Ted Kremenek // This new body block is a successor to our "exit" condition block. 10464cb3a855df3b3f8d551565cae9f43939a301ea89Ted Kremenek ExitConditionBlock->addSuccessor(BodyBlock); 10474cb3a855df3b3f8d551565cae9f43939a301ea89Ted Kremenek } 10486d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 10494cb3a855df3b3f8d551565cae9f43939a301ea89Ted Kremenek // Link up the condition block with the code that follows the loop. 10504cb3a855df3b3f8d551565cae9f43939a301ea89Ted Kremenek // (the false branch). 10514cb3a855df3b3f8d551565cae9f43939a301ea89Ted Kremenek ExitConditionBlock->addSuccessor(LoopSuccessor); 10524cb3a855df3b3f8d551565cae9f43939a301ea89Ted Kremenek 1053514de5a21645900c92cf4f4f7313d6f66945d134Ted Kremenek // Now create a prologue block to contain the collection expression. 10544cb3a855df3b3f8d551565cae9f43939a301ea89Ted Kremenek Block = createBlock(); 1055514de5a21645900c92cf4f4f7313d6f66945d134Ted Kremenek return addStmt(S->getCollection()); 10566d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump} 10576d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 1058b3b0b3624e462c2940f65b86e773bfc300005203Ted KremenekCFGBlock* CFGBuilder::VisitObjCAtSynchronizedStmt(ObjCAtSynchronizedStmt* S) { 1059b3b0b3624e462c2940f65b86e773bfc300005203Ted Kremenek // FIXME: Add locking 'primitives' to CFG for @synchronized. 10606d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 1061b3b0b3624e462c2940f65b86e773bfc300005203Ted Kremenek // Inline the body. 10624f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek CFGBlock *SyncBlock = addStmt(S->getSynchBody()); 10636d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 1064da5348eda7bb45d715561249dec9833d51dfda67Ted Kremenek // The sync body starts its own basic block. This makes it a little easier 1065da5348eda7bb45d715561249dec9833d51dfda67Ted Kremenek // for diagnostic clients. 1066da5348eda7bb45d715561249dec9833d51dfda67Ted Kremenek if (SyncBlock) { 1067da5348eda7bb45d715561249dec9833d51dfda67Ted Kremenek if (!FinishBlock(SyncBlock)) 1068da5348eda7bb45d715561249dec9833d51dfda67Ted Kremenek return 0; 10696d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 1070da5348eda7bb45d715561249dec9833d51dfda67Ted Kremenek Block = 0; 1071da5348eda7bb45d715561249dec9833d51dfda67Ted Kremenek } 10726d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 1073da5348eda7bb45d715561249dec9833d51dfda67Ted Kremenek Succ = SyncBlock; 10746d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 1075b3b0b3624e462c2940f65b86e773bfc300005203Ted Kremenek // Inline the sync expression. 10764f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek return addStmt(S->getSynchExpr()); 1077b3b0b3624e462c2940f65b86e773bfc300005203Ted Kremenek} 10786d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 1079e31c0d206b872b056dc42c3af21b11d5de4edfd9Ted KremenekCFGBlock* CFGBuilder::VisitObjCAtTryStmt(ObjCAtTryStmt* S) { 10804f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek // FIXME 108190658ec72542df44eb462c69056184d2946bdbceTed Kremenek return NYS(); 1082e31c0d206b872b056dc42c3af21b11d5de4edfd9Ted Kremenek} 1083514de5a21645900c92cf4f4f7313d6f66945d134Ted Kremenek 1084d4fdee35477e439759eea5f67ea03ff0c570fabaTed KremenekCFGBlock* CFGBuilder::VisitWhileStmt(WhileStmt* W) { 1085d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek CFGBlock* LoopSuccessor = NULL; 10866d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 1087fefb9f7009702befaf715e7a8debc9505c3c8634Mike Stump // "while" is a control-flow statement. Thus we stop processing the current 1088fefb9f7009702befaf715e7a8debc9505c3c8634Mike Stump // block. 1089d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek if (Block) { 10904e8df2eb7072db8f66572c3db31a2a08b12a752eTed Kremenek if (!FinishBlock(Block)) 10914e8df2eb7072db8f66572c3db31a2a08b12a752eTed Kremenek return 0; 1092d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek LoopSuccessor = Block; 10934f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek } else 10944f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek LoopSuccessor = Succ; 10956d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 10966d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // Because of short-circuit evaluation, the condition of the loop can span 10976d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // multiple basic blocks. Thus we need the "Entry" and "Exit" blocks that 10986d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // evaluate the condition. 109949af7cb8a3aca79783e7a0708b97a8f856f0da22Ted Kremenek CFGBlock* ExitConditionBlock = createBlock(false); 110049af7cb8a3aca79783e7a0708b97a8f856f0da22Ted Kremenek CFGBlock* EntryConditionBlock = ExitConditionBlock; 11016d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 110249af7cb8a3aca79783e7a0708b97a8f856f0da22Ted Kremenek // Set the terminator for the "exit" condition block. 110349af7cb8a3aca79783e7a0708b97a8f856f0da22Ted Kremenek ExitConditionBlock->setTerminator(W); 11046d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 11056d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // Now add the actual condition to the condition block. Because the condition 11066d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // itself may contain control-flow, new blocks may be created. Thus we update 11076d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // "Succ" after adding the condition. 110849af7cb8a3aca79783e7a0708b97a8f856f0da22Ted Kremenek if (Stmt* C = W->getCond()) { 110949af7cb8a3aca79783e7a0708b97a8f856f0da22Ted Kremenek Block = ExitConditionBlock; 111049af7cb8a3aca79783e7a0708b97a8f856f0da22Ted Kremenek EntryConditionBlock = addStmt(C); 1111f6e8541dd884029b85483a319ce7d32f3e476dccTed Kremenek assert(Block == EntryConditionBlock); 11124e8df2eb7072db8f66572c3db31a2a08b12a752eTed Kremenek if (Block) { 11134e8df2eb7072db8f66572c3db31a2a08b12a752eTed Kremenek if (!FinishBlock(EntryConditionBlock)) 11144e8df2eb7072db8f66572c3db31a2a08b12a752eTed Kremenek return 0; 11154e8df2eb7072db8f66572c3db31a2a08b12a752eTed Kremenek } 111649af7cb8a3aca79783e7a0708b97a8f856f0da22Ted Kremenek } 11176d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 11186d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // The condition block is the implicit successor for the loop body as well as 11196d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // any code above the loop. 112049af7cb8a3aca79783e7a0708b97a8f856f0da22Ted Kremenek Succ = EntryConditionBlock; 11216d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 112200998a068e50945118f334c98af05ed44d7c22a6Mike Stump // See if this is a known constant. 1123941fde8019d47c694b8483db45d5878818fa69d1Ted Kremenek const TryResult& KnownVal = TryEvaluateBool(W->getCond()); 112400998a068e50945118f334c98af05ed44d7c22a6Mike Stump 1125d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek // Process the loop body. 1126d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek { 1127f6e8541dd884029b85483a319ce7d32f3e476dccTed Kremenek assert(W->getBody()); 1128d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek 1129d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek // Save the current values for Block, Succ, and continue and break targets 1130d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek SaveAndRestore<CFGBlock*> save_Block(Block), save_Succ(Succ), 1131d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek save_continue(ContinueTargetBlock), 1132d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek save_break(BreakTargetBlock); 1133f6e8541dd884029b85483a319ce7d32f3e476dccTed Kremenek 11346d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // Create an empty block to represent the transition block for looping back 11356d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // to the head of the loop. 1136f6e8541dd884029b85483a319ce7d32f3e476dccTed Kremenek Block = 0; 1137f6e8541dd884029b85483a319ce7d32f3e476dccTed Kremenek assert(Succ == EntryConditionBlock); 1138f6e8541dd884029b85483a319ce7d32f3e476dccTed Kremenek Succ = createBlock(); 1139f6e8541dd884029b85483a319ce7d32f3e476dccTed Kremenek Succ->setLoopTarget(W); 11406d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump ContinueTargetBlock = Succ; 11416d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 1142d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek // All breaks should go to the code following the loop. 1143d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek BreakTargetBlock = LoopSuccessor; 11446d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 1145d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek // NULL out Block to force lazy instantiation of blocks for the body. 1146f752fcfae84fbf21b78383bf2461633382d51844Ted Kremenek Block = NULL; 11476d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 1148d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek // Create the body. The returned block is the entry to the loop body. 11494f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek CFGBlock* BodyBlock = addStmt(W->getBody()); 11506d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 1151af603f742491dc4707138c0293d295171fdd51baTed Kremenek if (!BodyBlock) 1152d5c3b1339e842619fc3ae79482424f901aeb89f3Zhongxing Xu BodyBlock = ContinueTargetBlock; // can happen for "while(...) ;" 11534e8df2eb7072db8f66572c3db31a2a08b12a752eTed Kremenek else if (Block) { 11544e8df2eb7072db8f66572c3db31a2a08b12a752eTed Kremenek if (!FinishBlock(BodyBlock)) 11554e8df2eb7072db8f66572c3db31a2a08b12a752eTed Kremenek return 0; 11564e8df2eb7072db8f66572c3db31a2a08b12a752eTed Kremenek } 11576d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 1158941fde8019d47c694b8483db45d5878818fa69d1Ted Kremenek // Add the loop body entry as a successor to the condition. 1159941fde8019d47c694b8483db45d5878818fa69d1Ted Kremenek ExitConditionBlock->addSuccessor(KnownVal.isFalse() ? NULL : BodyBlock); 1160bf15b278a439d73b605ec00a8d3977ef305712f4Ted Kremenek } 11616d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 1162941fde8019d47c694b8483db45d5878818fa69d1Ted Kremenek // Link up the condition block with the code that follows the loop. (the 1163941fde8019d47c694b8483db45d5878818fa69d1Ted Kremenek // false branch). 1164941fde8019d47c694b8483db45d5878818fa69d1Ted Kremenek ExitConditionBlock->addSuccessor(KnownVal.isTrue() ? NULL : LoopSuccessor); 11656d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 11666d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // There can be no more statements in the condition block since we loop back 11676d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // to this block. NULL out Block to force lazy creation of another block. 1168d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek Block = NULL; 11696d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 1170d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek // Return the condition block, which is the dominating block for the loop. 11715482713d70ecbfe608940018046aa248b3d03443Ted Kremenek Succ = EntryConditionBlock; 117249af7cb8a3aca79783e7a0708b97a8f856f0da22Ted Kremenek return EntryConditionBlock; 1173d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek} 11744f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek 11754f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek 11764f88063677a2d990a44bb0d5f8437d2498b91d7fTed KremenekCFGBlock *CFGBuilder::VisitObjCAtCatchStmt(ObjCAtCatchStmt* S) { 11774f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek // FIXME: For now we pretend that @catch and the code it contains does not 11784f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek // exit. 11794f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek return Block; 11804f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek} 11816d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 11822fda504dccd79f91ac9a7d82acecfbab3eaa1719Ted KremenekCFGBlock* CFGBuilder::VisitObjCAtThrowStmt(ObjCAtThrowStmt* S) { 11832fda504dccd79f91ac9a7d82acecfbab3eaa1719Ted Kremenek // FIXME: This isn't complete. We basically treat @throw like a return 11842fda504dccd79f91ac9a7d82acecfbab3eaa1719Ted Kremenek // statement. 11856d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 11866d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // If we were in the middle of a block we stop processing that block and 11876d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // reverse its statements. 11884f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek if (Block && !FinishBlock(Block)) 11894f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek return 0; 11906d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 11912fda504dccd79f91ac9a7d82acecfbab3eaa1719Ted Kremenek // Create the new block. 11922fda504dccd79f91ac9a7d82acecfbab3eaa1719Ted Kremenek Block = createBlock(false); 11936d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 11942fda504dccd79f91ac9a7d82acecfbab3eaa1719Ted Kremenek // The Exit block is the only successor. 11952fda504dccd79f91ac9a7d82acecfbab3eaa1719Ted Kremenek Block->addSuccessor(&cfg->getExit()); 11966d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 11976d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // Add the statement to the block. This may create new blocks if S contains 11986d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // control-flow (short-circuit operations). 11994f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek return VisitStmt(S, true); 12002fda504dccd79f91ac9a7d82acecfbab3eaa1719Ted Kremenek} 1201989d52d469df0c202f7de82f54407066c7db2e63Ted Kremenek 12020979d80615df97c675423de631c1b884819f4712Mike StumpCFGBlock* CFGBuilder::VisitCXXThrowExpr(CXXThrowExpr* T) { 12030979d80615df97c675423de631c1b884819f4712Mike Stump // If we were in the middle of a block we stop processing that block and 12040979d80615df97c675423de631c1b884819f4712Mike Stump // reverse its statements. 12050979d80615df97c675423de631c1b884819f4712Mike Stump if (Block && !FinishBlock(Block)) 12060979d80615df97c675423de631c1b884819f4712Mike Stump return 0; 12070979d80615df97c675423de631c1b884819f4712Mike Stump 12080979d80615df97c675423de631c1b884819f4712Mike Stump // Create the new block. 12090979d80615df97c675423de631c1b884819f4712Mike Stump Block = createBlock(false); 12100979d80615df97c675423de631c1b884819f4712Mike Stump 12110979d80615df97c675423de631c1b884819f4712Mike Stump // The Exit block is the only successor. 12120979d80615df97c675423de631c1b884819f4712Mike Stump Block->addSuccessor(&cfg->getExit()); 12130979d80615df97c675423de631c1b884819f4712Mike Stump 12140979d80615df97c675423de631c1b884819f4712Mike Stump // Add the statement to the block. This may create new blocks if S contains 12150979d80615df97c675423de631c1b884819f4712Mike Stump // control-flow (short-circuit operations). 12160979d80615df97c675423de631c1b884819f4712Mike Stump return VisitStmt(T, true); 12170979d80615df97c675423de631c1b884819f4712Mike Stump} 12180979d80615df97c675423de631c1b884819f4712Mike Stump 12194f88063677a2d990a44bb0d5f8437d2498b91d7fTed KremenekCFGBlock *CFGBuilder::VisitDoStmt(DoStmt* D) { 1220d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek CFGBlock* LoopSuccessor = NULL; 12216d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 12228f9893a2beeacd5149bd2d3d4c6e130516915068Mike Stump // "do...while" is a control-flow statement. Thus we stop processing the 12238f9893a2beeacd5149bd2d3d4c6e130516915068Mike Stump // current block. 1224d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek if (Block) { 12254e8df2eb7072db8f66572c3db31a2a08b12a752eTed Kremenek if (!FinishBlock(Block)) 12264e8df2eb7072db8f66572c3db31a2a08b12a752eTed Kremenek return 0; 1227d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek LoopSuccessor = Block; 12284f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek } else 12294f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek LoopSuccessor = Succ; 12306d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 12316d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // Because of short-circuit evaluation, the condition of the loop can span 12326d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // multiple basic blocks. Thus we need the "Entry" and "Exit" blocks that 12336d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // evaluate the condition. 123449af7cb8a3aca79783e7a0708b97a8f856f0da22Ted Kremenek CFGBlock* ExitConditionBlock = createBlock(false); 123549af7cb8a3aca79783e7a0708b97a8f856f0da22Ted Kremenek CFGBlock* EntryConditionBlock = ExitConditionBlock; 12366d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 123749af7cb8a3aca79783e7a0708b97a8f856f0da22Ted Kremenek // Set the terminator for the "exit" condition block. 12386d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump ExitConditionBlock->setTerminator(D); 12396d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 12406d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // Now add the actual condition to the condition block. Because the condition 12416d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // itself may contain control-flow, new blocks may be created. 124249af7cb8a3aca79783e7a0708b97a8f856f0da22Ted Kremenek if (Stmt* C = D->getCond()) { 124349af7cb8a3aca79783e7a0708b97a8f856f0da22Ted Kremenek Block = ExitConditionBlock; 124449af7cb8a3aca79783e7a0708b97a8f856f0da22Ted Kremenek EntryConditionBlock = addStmt(C); 12454e8df2eb7072db8f66572c3db31a2a08b12a752eTed Kremenek if (Block) { 12464e8df2eb7072db8f66572c3db31a2a08b12a752eTed Kremenek if (!FinishBlock(EntryConditionBlock)) 12474e8df2eb7072db8f66572c3db31a2a08b12a752eTed Kremenek return 0; 12484e8df2eb7072db8f66572c3db31a2a08b12a752eTed Kremenek } 124949af7cb8a3aca79783e7a0708b97a8f856f0da22Ted Kremenek } 12506d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 12515482713d70ecbfe608940018046aa248b3d03443Ted Kremenek // The condition block is the implicit successor for the loop body. 125249af7cb8a3aca79783e7a0708b97a8f856f0da22Ted Kremenek Succ = EntryConditionBlock; 125349af7cb8a3aca79783e7a0708b97a8f856f0da22Ted Kremenek 125400998a068e50945118f334c98af05ed44d7c22a6Mike Stump // See if this is a known constant. 1255941fde8019d47c694b8483db45d5878818fa69d1Ted Kremenek const TryResult &KnownVal = TryEvaluateBool(D->getCond()); 125600998a068e50945118f334c98af05ed44d7c22a6Mike Stump 1257d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek // Process the loop body. 125849af7cb8a3aca79783e7a0708b97a8f856f0da22Ted Kremenek CFGBlock* BodyBlock = NULL; 1259d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek { 1260d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek assert (D->getBody()); 12616d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 1262d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek // Save the current values for Block, Succ, and continue and break targets 1263d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek SaveAndRestore<CFGBlock*> save_Block(Block), save_Succ(Succ), 1264d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek save_continue(ContinueTargetBlock), 1265d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek save_break(BreakTargetBlock); 12666d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 1267d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek // All continues within this loop should go to the condition block 126849af7cb8a3aca79783e7a0708b97a8f856f0da22Ted Kremenek ContinueTargetBlock = EntryConditionBlock; 12696d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 1270d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek // All breaks should go to the code following the loop. 1271d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek BreakTargetBlock = LoopSuccessor; 12726d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 1273d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek // NULL out Block to force lazy instantiation of blocks for the body. 1274b5c13b0f4e438391b31dacb87641be7a1b990b57Ted Kremenek Block = NULL; 12756d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 1276d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek // Create the body. The returned block is the entry to the loop body. 12774f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek BodyBlock = addStmt(D->getBody()); 12786d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 1279af603f742491dc4707138c0293d295171fdd51baTed Kremenek if (!BodyBlock) 1280a9d996dbeb719200c4a9d86f68166a237583025fTed Kremenek BodyBlock = EntryConditionBlock; // can happen for "do ; while(...)" 12814e8df2eb7072db8f66572c3db31a2a08b12a752eTed Kremenek else if (Block) { 12824e8df2eb7072db8f66572c3db31a2a08b12a752eTed Kremenek if (!FinishBlock(BodyBlock)) 12834e8df2eb7072db8f66572c3db31a2a08b12a752eTed Kremenek return 0; 12844e8df2eb7072db8f66572c3db31a2a08b12a752eTed Kremenek } 12856d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 12868f08c9d83fdabb6f27c44a4dbce78487519c89ebTed Kremenek // Add an intermediate block between the BodyBlock and the 12876d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // ExitConditionBlock to represent the "loop back" transition. Create an 12886d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // empty block to represent the transition block for looping back to the 12896d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // head of the loop. 12908f08c9d83fdabb6f27c44a4dbce78487519c89ebTed Kremenek // FIXME: Can we do this more efficiently without adding another block? 12918f08c9d83fdabb6f27c44a4dbce78487519c89ebTed Kremenek Block = NULL; 12928f08c9d83fdabb6f27c44a4dbce78487519c89ebTed Kremenek Succ = BodyBlock; 12938f08c9d83fdabb6f27c44a4dbce78487519c89ebTed Kremenek CFGBlock *LoopBackBlock = createBlock(); 12948f08c9d83fdabb6f27c44a4dbce78487519c89ebTed Kremenek LoopBackBlock->setLoopTarget(D); 12956d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 1296941fde8019d47c694b8483db45d5878818fa69d1Ted Kremenek // Add the loop body entry as a successor to the condition. 1297941fde8019d47c694b8483db45d5878818fa69d1Ted Kremenek ExitConditionBlock->addSuccessor(KnownVal.isFalse() ? NULL : LoopBackBlock); 1298b5c13b0f4e438391b31dacb87641be7a1b990b57Ted Kremenek } 12996d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 1300941fde8019d47c694b8483db45d5878818fa69d1Ted Kremenek // Link up the condition block with the code that follows the loop. 1301941fde8019d47c694b8483db45d5878818fa69d1Ted Kremenek // (the false branch). 1302941fde8019d47c694b8483db45d5878818fa69d1Ted Kremenek ExitConditionBlock->addSuccessor(KnownVal.isTrue() ? NULL : LoopSuccessor); 13036d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 13046d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // There can be no more statements in the body block(s) since we loop back to 13056d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // the body. NULL out Block to force lazy creation of another block. 1306d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek Block = NULL; 13076d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 1308d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek // Return the loop body, which is the dominating block for the loop. 13095482713d70ecbfe608940018046aa248b3d03443Ted Kremenek Succ = BodyBlock; 1310d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek return BodyBlock; 1311d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek} 1312d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek 1313d4fdee35477e439759eea5f67ea03ff0c570fabaTed KremenekCFGBlock* CFGBuilder::VisitContinueStmt(ContinueStmt* C) { 1314d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek // "continue" is a control-flow statement. Thus we stop processing the 1315d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek // current block. 13164f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek if (Block && !FinishBlock(Block)) 13174e8df2eb7072db8f66572c3db31a2a08b12a752eTed Kremenek return 0; 13186d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 1319d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek // Now create a new block that ends with the continue statement. 1320d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek Block = createBlock(false); 1321d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek Block->setTerminator(C); 13226d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 1323d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek // If there is no target for the continue, then we are looking at an 1324235c5ed8bee5bbcb45de1707d6988635e49b10b8Ted Kremenek // incomplete AST. This means the CFG cannot be constructed. 1325235c5ed8bee5bbcb45de1707d6988635e49b10b8Ted Kremenek if (ContinueTargetBlock) 1326235c5ed8bee5bbcb45de1707d6988635e49b10b8Ted Kremenek Block->addSuccessor(ContinueTargetBlock); 1327235c5ed8bee5bbcb45de1707d6988635e49b10b8Ted Kremenek else 1328235c5ed8bee5bbcb45de1707d6988635e49b10b8Ted Kremenek badCFG = true; 13296d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 1330d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek return Block; 1331d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek} 13324f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek 133313fc08a323b29dd97a46def1e3a15bf082476efaTed KremenekCFGBlock *CFGBuilder::VisitSizeOfAlignOfExpr(SizeOfAlignOfExpr *E, 133413fc08a323b29dd97a46def1e3a15bf082476efaTed Kremenek bool alwaysAdd) { 133513fc08a323b29dd97a46def1e3a15bf082476efaTed Kremenek 133613fc08a323b29dd97a46def1e3a15bf082476efaTed Kremenek if (alwaysAdd) { 133713fc08a323b29dd97a46def1e3a15bf082476efaTed Kremenek autoCreateBlock(); 133813fc08a323b29dd97a46def1e3a15bf082476efaTed Kremenek Block->appendStmt(E); 133913fc08a323b29dd97a46def1e3a15bf082476efaTed Kremenek } 134013fc08a323b29dd97a46def1e3a15bf082476efaTed Kremenek 13414f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek // VLA types have expressions that must be evaluated. 13424f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek if (E->isArgumentType()) { 13434f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek for (VariableArrayType* VA = FindVA(E->getArgumentType().getTypePtr()); 13444f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek VA != 0; VA = FindVA(VA->getElementType().getTypePtr())) 13454f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek addStmt(VA->getSizeExpr()); 13464e8df2eb7072db8f66572c3db31a2a08b12a752eTed Kremenek } 13474f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek 13486d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump return Block; 1349d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek} 13504f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek 13514f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek/// VisitStmtExpr - Utility method to handle (nested) statement 13524f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek/// expressions (a GCC extension). 135313fc08a323b29dd97a46def1e3a15bf082476efaTed KremenekCFGBlock* CFGBuilder::VisitStmtExpr(StmtExpr *SE, bool alwaysAdd) { 135413fc08a323b29dd97a46def1e3a15bf082476efaTed Kremenek if (alwaysAdd) { 135513fc08a323b29dd97a46def1e3a15bf082476efaTed Kremenek autoCreateBlock(); 135613fc08a323b29dd97a46def1e3a15bf082476efaTed Kremenek Block->appendStmt(SE); 135713fc08a323b29dd97a46def1e3a15bf082476efaTed Kremenek } 13584f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek return VisitCompoundStmt(SE->getSubStmt()); 13594f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek} 1360d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek 1361411cdee0b490f79428c9eb977f25199eb7d21cd8Ted KremenekCFGBlock* CFGBuilder::VisitSwitchStmt(SwitchStmt* Terminator) { 13626d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // "switch" is a control-flow statement. Thus we stop processing the current 13636d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // block. 1364d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek CFGBlock* SwitchSuccessor = NULL; 13656d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 1366d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek if (Block) { 13674e8df2eb7072db8f66572c3db31a2a08b12a752eTed Kremenek if (!FinishBlock(Block)) 13684e8df2eb7072db8f66572c3db31a2a08b12a752eTed Kremenek return 0; 1369d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek SwitchSuccessor = Block; 13706d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump } else SwitchSuccessor = Succ; 1371d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek 1372d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek // Save the current "switch" context. 1373d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek SaveAndRestore<CFGBlock*> save_switch(SwitchTerminatedBlock), 1374eef5a9ac59f4f8b868ef0657ccf6bec81b4fe37aTed Kremenek save_break(BreakTargetBlock), 1375eef5a9ac59f4f8b868ef0657ccf6bec81b4fe37aTed Kremenek save_default(DefaultCaseBlock); 1376eef5a9ac59f4f8b868ef0657ccf6bec81b4fe37aTed Kremenek 13776d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // Set the "default" case to be the block after the switch statement. If the 13786d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // switch statement contains a "default:", this value will be overwritten with 13796d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // the block for that code. 1380eef5a9ac59f4f8b868ef0657ccf6bec81b4fe37aTed Kremenek DefaultCaseBlock = SwitchSuccessor; 13816d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 1382d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek // Create a new block that will contain the switch statement. 1383d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek SwitchTerminatedBlock = createBlock(false); 13846d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 1385d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek // Now process the switch body. The code after the switch is the implicit 1386d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek // successor. 1387d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek Succ = SwitchSuccessor; 1388d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek BreakTargetBlock = SwitchSuccessor; 13896d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 13906d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // When visiting the body, the case statements should automatically get linked 13916d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // up to the switch. We also don't keep a pointer to the body, since all 13926d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // control-flow from the switch goes to case/default statements. 1393411cdee0b490f79428c9eb977f25199eb7d21cd8Ted Kremenek assert (Terminator->getBody() && "switch must contain a non-NULL body"); 139449af7cb8a3aca79783e7a0708b97a8f856f0da22Ted Kremenek Block = NULL; 13954f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek CFGBlock *BodyBlock = addStmt(Terminator->getBody()); 13964e8df2eb7072db8f66572c3db31a2a08b12a752eTed Kremenek if (Block) { 13974e8df2eb7072db8f66572c3db31a2a08b12a752eTed Kremenek if (!FinishBlock(BodyBlock)) 13984e8df2eb7072db8f66572c3db31a2a08b12a752eTed Kremenek return 0; 13994e8df2eb7072db8f66572c3db31a2a08b12a752eTed Kremenek } 140049af7cb8a3aca79783e7a0708b97a8f856f0da22Ted Kremenek 14016d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // If we have no "default:" case, the default transition is to the code 14026d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // following the switch body. 1403eef5a9ac59f4f8b868ef0657ccf6bec81b4fe37aTed Kremenek SwitchTerminatedBlock->addSuccessor(DefaultCaseBlock); 14046d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 140549af7cb8a3aca79783e7a0708b97a8f856f0da22Ted Kremenek // Add the terminator and condition in the switch block. 1406411cdee0b490f79428c9eb977f25199eb7d21cd8Ted Kremenek SwitchTerminatedBlock->setTerminator(Terminator); 1407411cdee0b490f79428c9eb977f25199eb7d21cd8Ted Kremenek assert (Terminator->getCond() && "switch condition must be non-NULL"); 1408d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek Block = SwitchTerminatedBlock; 14096d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 1410411cdee0b490f79428c9eb977f25199eb7d21cd8Ted Kremenek return addStmt(Terminator->getCond()); 1411d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek} 1412d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek 14134f88063677a2d990a44bb0d5f8437d2498b91d7fTed KremenekCFGBlock* CFGBuilder::VisitCaseStmt(CaseStmt* CS) { 14146d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // CaseStmts are essentially labels, so they are the first statement in a 14156d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // block. 141629ccaa186ac27bcb414c5acb069f6438b27dd5e7Ted Kremenek 14174f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek if (CS->getSubStmt()) 14184f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek addStmt(CS->getSubStmt()); 14194f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek 142029ccaa186ac27bcb414c5acb069f6438b27dd5e7Ted Kremenek CFGBlock* CaseBlock = Block; 14214f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek if (!CaseBlock) 14224f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek CaseBlock = createBlock(); 14236d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 14246d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // Cases statements partition blocks, so this is the top of the basic block we 14256d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // were processing (the "case XXX:" is the label). 14264f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek CaseBlock->setLabel(CS); 14274f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek 14284e8df2eb7072db8f66572c3db31a2a08b12a752eTed Kremenek if (!FinishBlock(CaseBlock)) 14294e8df2eb7072db8f66572c3db31a2a08b12a752eTed Kremenek return 0; 14306d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 14316d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // Add this block to the list of successors for the block with the switch 14326d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // statement. 14334f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek assert(SwitchTerminatedBlock); 1434eef5a9ac59f4f8b868ef0657ccf6bec81b4fe37aTed Kremenek SwitchTerminatedBlock->addSuccessor(CaseBlock); 14356d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 1436d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek // We set Block to NULL to allow lazy creation of a new block (if necessary) 1437d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek Block = NULL; 14386d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 1439d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek // This block is now the implicit successor of other blocks. 1440d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek Succ = CaseBlock; 14416d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 14422677ea871a25aa79f9db360f6ed10584c02267adTed Kremenek return CaseBlock; 1443d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek} 14446d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 1445411cdee0b490f79428c9eb977f25199eb7d21cd8Ted KremenekCFGBlock* CFGBuilder::VisitDefaultStmt(DefaultStmt* Terminator) { 14464f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek if (Terminator->getSubStmt()) 14474f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek addStmt(Terminator->getSubStmt()); 14484f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek 1449eef5a9ac59f4f8b868ef0657ccf6bec81b4fe37aTed Kremenek DefaultCaseBlock = Block; 14504f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek 14514f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek if (!DefaultCaseBlock) 14524f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek DefaultCaseBlock = createBlock(); 14536d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 14546d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // Default statements partition blocks, so this is the top of the basic block 14556d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // we were processing (the "default:" is the label). 1456411cdee0b490f79428c9eb977f25199eb7d21cd8Ted Kremenek DefaultCaseBlock->setLabel(Terminator); 14574f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek 14584e8df2eb7072db8f66572c3db31a2a08b12a752eTed Kremenek if (!FinishBlock(DefaultCaseBlock)) 14594e8df2eb7072db8f66572c3db31a2a08b12a752eTed Kremenek return 0; 1460eef5a9ac59f4f8b868ef0657ccf6bec81b4fe37aTed Kremenek 14616d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // Unlike case statements, we don't add the default block to the successors 14626d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // for the switch statement immediately. This is done when we finish 14636d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // processing the switch statement. This allows for the default case 14646d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // (including a fall-through to the code after the switch statement) to always 14656d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // be the last successor of a switch-terminated block. 14666d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 1467eef5a9ac59f4f8b868ef0657ccf6bec81b4fe37aTed Kremenek // We set Block to NULL to allow lazy creation of a new block (if necessary) 1468eef5a9ac59f4f8b868ef0657ccf6bec81b4fe37aTed Kremenek Block = NULL; 14696d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 1470eef5a9ac59f4f8b868ef0657ccf6bec81b4fe37aTed Kremenek // This block is now the implicit successor of other blocks. 1471eef5a9ac59f4f8b868ef0657ccf6bec81b4fe37aTed Kremenek Succ = DefaultCaseBlock; 14726d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 14736d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump return DefaultCaseBlock; 1474295222c1f0926d84de77f076e79903523eeb5dbfTed Kremenek} 1475d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek 147619bb356317952445b03ee341c02f6147083c9eeaTed KremenekCFGBlock* CFGBuilder::VisitIndirectGotoStmt(IndirectGotoStmt* I) { 14776d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // Lazily create the indirect-goto dispatch block if there isn't one already. 147819bb356317952445b03ee341c02f6147083c9eeaTed Kremenek CFGBlock* IBlock = cfg->getIndirectGotoBlock(); 14796d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 148019bb356317952445b03ee341c02f6147083c9eeaTed Kremenek if (!IBlock) { 148119bb356317952445b03ee341c02f6147083c9eeaTed Kremenek IBlock = createBlock(false); 148219bb356317952445b03ee341c02f6147083c9eeaTed Kremenek cfg->setIndirectGotoBlock(IBlock); 148319bb356317952445b03ee341c02f6147083c9eeaTed Kremenek } 14846d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 148519bb356317952445b03ee341c02f6147083c9eeaTed Kremenek // IndirectGoto is a control-flow statement. Thus we stop processing the 148619bb356317952445b03ee341c02f6147083c9eeaTed Kremenek // current block and create a new one. 14874f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek if (Block && !FinishBlock(Block)) 14884f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek return 0; 14894f88063677a2d990a44bb0d5f8437d2498b91d7fTed Kremenek 149019bb356317952445b03ee341c02f6147083c9eeaTed Kremenek Block = createBlock(false); 149119bb356317952445b03ee341c02f6147083c9eeaTed Kremenek Block->setTerminator(I); 149219bb356317952445b03ee341c02f6147083c9eeaTed Kremenek Block->addSuccessor(IBlock); 149319bb356317952445b03ee341c02f6147083c9eeaTed Kremenek return addStmt(I->getTarget()); 149419bb356317952445b03ee341c02f6147083c9eeaTed Kremenek} 149519bb356317952445b03ee341c02f6147083c9eeaTed Kremenek 1496befef2f69759d7338e2b7c5ce6c8b6f47fe6e667Ted Kremenek} // end anonymous namespace 1497026473c2175424a039f51ca8949937268721b965Ted Kremenek 14986d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump/// createBlock - Constructs and adds a new CFGBlock to the CFG. The block has 14996d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump/// no successors or predecessors. If this is the first block created in the 15006d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump/// CFG, it is automatically set to be the Entry and Exit of the CFG. 15019438252ad2ecae5338df565ca33c6969e4fbfa41Ted KremenekCFGBlock* CFG::createBlock() { 1502026473c2175424a039f51ca8949937268721b965Ted Kremenek bool first_block = begin() == end(); 1503026473c2175424a039f51ca8949937268721b965Ted Kremenek 1504026473c2175424a039f51ca8949937268721b965Ted Kremenek // Create the block. 15059438252ad2ecae5338df565ca33c6969e4fbfa41Ted Kremenek Blocks.push_front(CFGBlock(NumBlockIDs++)); 1506026473c2175424a039f51ca8949937268721b965Ted Kremenek 1507026473c2175424a039f51ca8949937268721b965Ted Kremenek // If this is the first block, set it as the Entry and Exit. 1508026473c2175424a039f51ca8949937268721b965Ted Kremenek if (first_block) Entry = Exit = &front(); 1509026473c2175424a039f51ca8949937268721b965Ted Kremenek 1510026473c2175424a039f51ca8949937268721b965Ted Kremenek // Return the block. 1511026473c2175424a039f51ca8949937268721b965Ted Kremenek return &front(); 1512026473c2175424a039f51ca8949937268721b965Ted Kremenek} 1513026473c2175424a039f51ca8949937268721b965Ted Kremenek 1514026473c2175424a039f51ca8949937268721b965Ted Kremenek/// buildCFG - Constructs a CFG from an AST. Ownership of the returned 1515026473c2175424a039f51ca8949937268721b965Ted Kremenek/// CFG is returned to the caller. 1516e5af3ce53ec58995b09381ba645ab2117a46647bMike StumpCFG* CFG::buildCFG(Stmt* Statement, ASTContext *C) { 1517fddd51853f8ccaa1df2476376e6fd74d2f315c73Ted Kremenek CFGBuilder Builder; 1518e5af3ce53ec58995b09381ba645ab2117a46647bMike Stump return Builder.buildCFG(Statement, C); 1519fddd51853f8ccaa1df2476376e6fd74d2f315c73Ted Kremenek} 1520fddd51853f8ccaa1df2476376e6fd74d2f315c73Ted Kremenek 1521026473c2175424a039f51ca8949937268721b965Ted Kremenek/// reverseStmts - Reverses the orders of statements within a CFGBlock. 1522fddd51853f8ccaa1df2476376e6fd74d2f315c73Ted Kremenekvoid CFGBlock::reverseStmts() { std::reverse(Stmts.begin(),Stmts.end()); } 1523fddd51853f8ccaa1df2476376e6fd74d2f315c73Ted Kremenek 152463f5887f316fb52d243fcbb3631c039de6c4b993Ted Kremenek//===----------------------------------------------------------------------===// 152563f5887f316fb52d243fcbb3631c039de6c4b993Ted Kremenek// CFG: Queries for BlkExprs. 152663f5887f316fb52d243fcbb3631c039de6c4b993Ted Kremenek//===----------------------------------------------------------------------===// 152763f5887f316fb52d243fcbb3631c039de6c4b993Ted Kremenek 152863f5887f316fb52d243fcbb3631c039de6c4b993Ted Kremeneknamespace { 152986946745225096243f6969dc745267b78fc211a6Ted Kremenek typedef llvm::DenseMap<const Stmt*,unsigned> BlkExprMapTy; 153063f5887f316fb52d243fcbb3631c039de6c4b993Ted Kremenek} 153163f5887f316fb52d243fcbb3631c039de6c4b993Ted Kremenek 1532411cdee0b490f79428c9eb977f25199eb7d21cd8Ted Kremenekstatic void FindSubExprAssignments(Stmt* Terminator, llvm::SmallPtrSet<Expr*,50>& Set) { 1533411cdee0b490f79428c9eb977f25199eb7d21cd8Ted Kremenek if (!Terminator) 153433d4aab80f31bd06257526fe2883ea920529456bTed Kremenek return; 15356d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 1536411cdee0b490f79428c9eb977f25199eb7d21cd8Ted Kremenek for (Stmt::child_iterator I=Terminator->child_begin(), E=Terminator->child_end(); I!=E; ++I) { 153733d4aab80f31bd06257526fe2883ea920529456bTed Kremenek if (!*I) continue; 15386d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 153933d4aab80f31bd06257526fe2883ea920529456bTed Kremenek if (BinaryOperator* B = dyn_cast<BinaryOperator>(*I)) 154033d4aab80f31bd06257526fe2883ea920529456bTed Kremenek if (B->isAssignmentOp()) Set.insert(B); 15416d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 154233d4aab80f31bd06257526fe2883ea920529456bTed Kremenek FindSubExprAssignments(*I, Set); 154333d4aab80f31bd06257526fe2883ea920529456bTed Kremenek } 154433d4aab80f31bd06257526fe2883ea920529456bTed Kremenek} 154533d4aab80f31bd06257526fe2883ea920529456bTed Kremenek 154663f5887f316fb52d243fcbb3631c039de6c4b993Ted Kremenekstatic BlkExprMapTy* PopulateBlkExprMap(CFG& cfg) { 154763f5887f316fb52d243fcbb3631c039de6c4b993Ted Kremenek BlkExprMapTy* M = new BlkExprMapTy(); 15486d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 15496d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // Look for assignments that are used as subexpressions. These are the only 15506d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // assignments that we want to *possibly* register as a block-level 15516d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // expression. Basically, if an assignment occurs both in a subexpression and 15526d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // at the block-level, it is a block-level expression. 155333d4aab80f31bd06257526fe2883ea920529456bTed Kremenek llvm::SmallPtrSet<Expr*,50> SubExprAssignments; 15546d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 155563f5887f316fb52d243fcbb3631c039de6c4b993Ted Kremenek for (CFG::iterator I=cfg.begin(), E=cfg.end(); I != E; ++I) 155663f5887f316fb52d243fcbb3631c039de6c4b993Ted Kremenek for (CFGBlock::iterator BI=I->begin(), EI=I->end(); BI != EI; ++BI) 155733d4aab80f31bd06257526fe2883ea920529456bTed Kremenek FindSubExprAssignments(*BI, SubExprAssignments); 155886946745225096243f6969dc745267b78fc211a6Ted Kremenek 1559411cdee0b490f79428c9eb977f25199eb7d21cd8Ted Kremenek for (CFG::iterator I=cfg.begin(), E=cfg.end(); I != E; ++I) { 15606d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 15616d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // Iterate over the statements again on identify the Expr* and Stmt* at the 15626d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // block-level that are block-level expressions. 1563411cdee0b490f79428c9eb977f25199eb7d21cd8Ted Kremenek 156433d4aab80f31bd06257526fe2883ea920529456bTed Kremenek for (CFGBlock::iterator BI=I->begin(), EI=I->end(); BI != EI; ++BI) 1565411cdee0b490f79428c9eb977f25199eb7d21cd8Ted Kremenek if (Expr* Exp = dyn_cast<Expr>(*BI)) { 15666d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 1567411cdee0b490f79428c9eb977f25199eb7d21cd8Ted Kremenek if (BinaryOperator* B = dyn_cast<BinaryOperator>(Exp)) { 156833d4aab80f31bd06257526fe2883ea920529456bTed Kremenek // Assignment expressions that are not nested within another 15696d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // expression are really "statements" whose value is never used by 15706d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // another expression. 1571411cdee0b490f79428c9eb977f25199eb7d21cd8Ted Kremenek if (B->isAssignmentOp() && !SubExprAssignments.count(Exp)) 157233d4aab80f31bd06257526fe2883ea920529456bTed Kremenek continue; 15736d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump } else if (const StmtExpr* Terminator = dyn_cast<StmtExpr>(Exp)) { 15746d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // Special handling for statement expressions. The last statement in 15756d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump // the statement expression is also a block-level expr. 1576411cdee0b490f79428c9eb977f25199eb7d21cd8Ted Kremenek const CompoundStmt* C = Terminator->getSubStmt(); 157786946745225096243f6969dc745267b78fc211a6Ted Kremenek if (!C->body_empty()) { 157833d4aab80f31bd06257526fe2883ea920529456bTed Kremenek unsigned x = M->size(); 157986946745225096243f6969dc745267b78fc211a6Ted Kremenek (*M)[C->body_back()] = x; 158086946745225096243f6969dc745267b78fc211a6Ted Kremenek } 158186946745225096243f6969dc745267b78fc211a6Ted Kremenek } 1582e2dcd783a04f654c50bd8b13fb08a440afbd67e7Ted Kremenek 158333d4aab80f31bd06257526fe2883ea920529456bTed Kremenek unsigned x = M->size(); 1584411cdee0b490f79428c9eb977f25199eb7d21cd8Ted Kremenek (*M)[Exp] = x; 158533d4aab80f31bd06257526fe2883ea920529456bTed Kremenek } 15866d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 1587411cdee0b490f79428c9eb977f25199eb7d21cd8Ted Kremenek // Look at terminators. The condition is a block-level expression. 15886d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 1589390e48b15ad93f85bfd1e33b9992c198fa0db475Ted Kremenek Stmt* S = I->getTerminatorCondition(); 15906d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 1591390e48b15ad93f85bfd1e33b9992c198fa0db475Ted Kremenek if (S && M->find(S) == M->end()) { 1592411cdee0b490f79428c9eb977f25199eb7d21cd8Ted Kremenek unsigned x = M->size(); 1593390e48b15ad93f85bfd1e33b9992c198fa0db475Ted Kremenek (*M)[S] = x; 1594411cdee0b490f79428c9eb977f25199eb7d21cd8Ted Kremenek } 1595411cdee0b490f79428c9eb977f25199eb7d21cd8Ted Kremenek } 15966d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 159786946745225096243f6969dc745267b78fc211a6Ted Kremenek return M; 159863f5887f316fb52d243fcbb3631c039de6c4b993Ted Kremenek} 159963f5887f316fb52d243fcbb3631c039de6c4b993Ted Kremenek 160086946745225096243f6969dc745267b78fc211a6Ted KremenekCFG::BlkExprNumTy CFG::getBlkExprNum(const Stmt* S) { 160186946745225096243f6969dc745267b78fc211a6Ted Kremenek assert(S != NULL); 160263f5887f316fb52d243fcbb3631c039de6c4b993Ted Kremenek if (!BlkExprMap) { BlkExprMap = (void*) PopulateBlkExprMap(*this); } 16036d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 160463f5887f316fb52d243fcbb3631c039de6c4b993Ted Kremenek BlkExprMapTy* M = reinterpret_cast<BlkExprMapTy*>(BlkExprMap); 160586946745225096243f6969dc745267b78fc211a6Ted Kremenek BlkExprMapTy::iterator I = M->find(S); 16066d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 160763f5887f316fb52d243fcbb3631c039de6c4b993Ted Kremenek if (I == M->end()) return CFG::BlkExprNumTy(); 160863f5887f316fb52d243fcbb3631c039de6c4b993Ted Kremenek else return CFG::BlkExprNumTy(I->second); 160963f5887f316fb52d243fcbb3631c039de6c4b993Ted Kremenek} 16107dba8607e59096014b7139ff20ef00870041d518Ted Kremenek 161163f5887f316fb52d243fcbb3631c039de6c4b993Ted Kremenekunsigned CFG::getNumBlkExprs() { 161263f5887f316fb52d243fcbb3631c039de6c4b993Ted Kremenek if (const BlkExprMapTy* M = reinterpret_cast<const BlkExprMapTy*>(BlkExprMap)) 161363f5887f316fb52d243fcbb3631c039de6c4b993Ted Kremenek return M->size(); 161463f5887f316fb52d243fcbb3631c039de6c4b993Ted Kremenek else { 161563f5887f316fb52d243fcbb3631c039de6c4b993Ted Kremenek // We assume callers interested in the number of BlkExprs will want 161663f5887f316fb52d243fcbb3631c039de6c4b993Ted Kremenek // the map constructed if it doesn't already exist. 161763f5887f316fb52d243fcbb3631c039de6c4b993Ted Kremenek BlkExprMap = (void*) PopulateBlkExprMap(*this); 161863f5887f316fb52d243fcbb3631c039de6c4b993Ted Kremenek return reinterpret_cast<BlkExprMapTy*>(BlkExprMap)->size(); 161963f5887f316fb52d243fcbb3631c039de6c4b993Ted Kremenek } 162063f5887f316fb52d243fcbb3631c039de6c4b993Ted Kremenek} 162163f5887f316fb52d243fcbb3631c039de6c4b993Ted Kremenek 1622274f4334f6dd35239e5c3d4b86198f7f5804b059Ted Kremenek//===----------------------------------------------------------------------===// 1623274f4334f6dd35239e5c3d4b86198f7f5804b059Ted Kremenek// Cleanup: CFG dstor. 1624274f4334f6dd35239e5c3d4b86198f7f5804b059Ted Kremenek//===----------------------------------------------------------------------===// 1625274f4334f6dd35239e5c3d4b86198f7f5804b059Ted Kremenek 162663f5887f316fb52d243fcbb3631c039de6c4b993Ted KremenekCFG::~CFG() { 162763f5887f316fb52d243fcbb3631c039de6c4b993Ted Kremenek delete reinterpret_cast<const BlkExprMapTy*>(BlkExprMap); 162863f5887f316fb52d243fcbb3631c039de6c4b993Ted Kremenek} 16296d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 16307dba8607e59096014b7139ff20ef00870041d518Ted Kremenek//===----------------------------------------------------------------------===// 16317dba8607e59096014b7139ff20ef00870041d518Ted Kremenek// CFG pretty printing 16327dba8607e59096014b7139ff20ef00870041d518Ted Kremenek//===----------------------------------------------------------------------===// 16337dba8607e59096014b7139ff20ef00870041d518Ted Kremenek 163442a509f6a4f71bb805cc4abbb26722a34dffdddeTed Kremeneknamespace { 16352bac4ea765a4a6e1f6149964663f62d4bca6743bTed Kremenek 16366fa9b88e2c3d47d606a273df2f8d03509bcff0b9Ted Kremenekclass VISIBILITY_HIDDEN StmtPrinterHelper : public PrinterHelper { 16376d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 163842a509f6a4f71bb805cc4abbb26722a34dffdddeTed Kremenek typedef llvm::DenseMap<Stmt*,std::pair<unsigned,unsigned> > StmtMapTy; 163942a509f6a4f71bb805cc4abbb26722a34dffdddeTed Kremenek StmtMapTy StmtMap; 164042a509f6a4f71bb805cc4abbb26722a34dffdddeTed Kremenek signed CurrentBlock; 164142a509f6a4f71bb805cc4abbb26722a34dffdddeTed Kremenek unsigned CurrentStmt; 1642e4f2142d00fa5fdb580c4e2413da91882d955381Chris Lattner const LangOptions &LangOpts; 164342a509f6a4f71bb805cc4abbb26722a34dffdddeTed Kremenekpublic: 16441c29bba6da40bbe59fb1f81c4cd5ab5471554ffeTed Kremenek 1645e4f2142d00fa5fdb580c4e2413da91882d955381Chris Lattner StmtPrinterHelper(const CFG* cfg, const LangOptions &LO) 1646e4f2142d00fa5fdb580c4e2413da91882d955381Chris Lattner : CurrentBlock(0), CurrentStmt(0), LangOpts(LO) { 164742a509f6a4f71bb805cc4abbb26722a34dffdddeTed Kremenek for (CFG::const_iterator I = cfg->begin(), E = cfg->end(); I != E; ++I ) { 164842a509f6a4f71bb805cc4abbb26722a34dffdddeTed Kremenek unsigned j = 1; 164942a509f6a4f71bb805cc4abbb26722a34dffdddeTed Kremenek for (CFGBlock::const_iterator BI = I->begin(), BEnd = I->end() ; 165042a509f6a4f71bb805cc4abbb26722a34dffdddeTed Kremenek BI != BEnd; ++BI, ++j ) 165142a509f6a4f71bb805cc4abbb26722a34dffdddeTed Kremenek StmtMap[*BI] = std::make_pair(I->getBlockID(),j); 165242a509f6a4f71bb805cc4abbb26722a34dffdddeTed Kremenek } 1653fddd51853f8ccaa1df2476376e6fd74d2f315c73Ted Kremenek } 16546d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 165542a509f6a4f71bb805cc4abbb26722a34dffdddeTed Kremenek virtual ~StmtPrinterHelper() {} 16566d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 1657e4f2142d00fa5fdb580c4e2413da91882d955381Chris Lattner const LangOptions &getLangOpts() const { return LangOpts; } 165842a509f6a4f71bb805cc4abbb26722a34dffdddeTed Kremenek void setBlockID(signed i) { CurrentBlock = i; } 165942a509f6a4f71bb805cc4abbb26722a34dffdddeTed Kremenek void setStmtID(unsigned i) { CurrentStmt = i; } 16606d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 1661a95d3750441ac8ad03e36af8e6e74039c9a3109dTed Kremenek virtual bool handledStmt(Stmt* Terminator, llvm::raw_ostream& OS) { 16626d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 1663411cdee0b490f79428c9eb977f25199eb7d21cd8Ted Kremenek StmtMapTy::iterator I = StmtMap.find(Terminator); 1664fddd51853f8ccaa1df2476376e6fd74d2f315c73Ted Kremenek 166542a509f6a4f71bb805cc4abbb26722a34dffdddeTed Kremenek if (I == StmtMap.end()) 166642a509f6a4f71bb805cc4abbb26722a34dffdddeTed Kremenek return false; 16676d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 16686d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump if (CurrentBlock >= 0 && I->second.first == (unsigned) CurrentBlock 166942a509f6a4f71bb805cc4abbb26722a34dffdddeTed Kremenek && I->second.second == CurrentStmt) 167042a509f6a4f71bb805cc4abbb26722a34dffdddeTed Kremenek return false; 16716d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 16721c29bba6da40bbe59fb1f81c4cd5ab5471554ffeTed Kremenek OS << "[B" << I->second.first << "." << I->second.second << "]"; 16731c29bba6da40bbe59fb1f81c4cd5ab5471554ffeTed Kremenek return true; 167442a509f6a4f71bb805cc4abbb26722a34dffdddeTed Kremenek } 167542a509f6a4f71bb805cc4abbb26722a34dffdddeTed Kremenek}; 1676e4f2142d00fa5fdb580c4e2413da91882d955381Chris Lattner} // end anonymous namespace 1677e4f2142d00fa5fdb580c4e2413da91882d955381Chris Lattner 1678e8ee26b49d68ae3ffdf9a990ff7511ef55afa04cTed Kremenek 1679e4f2142d00fa5fdb580c4e2413da91882d955381Chris Lattnernamespace { 16806fa9b88e2c3d47d606a273df2f8d03509bcff0b9Ted Kremenekclass VISIBILITY_HIDDEN CFGBlockTerminatorPrint 16816fa9b88e2c3d47d606a273df2f8d03509bcff0b9Ted Kremenek : public StmtVisitor<CFGBlockTerminatorPrint,void> { 16826d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 1683a95d3750441ac8ad03e36af8e6e74039c9a3109dTed Kremenek llvm::raw_ostream& OS; 168442a509f6a4f71bb805cc4abbb26722a34dffdddeTed Kremenek StmtPrinterHelper* Helper; 1685d249e1d1f1498b81314459ceda19d6ff25c278adDouglas Gregor PrintingPolicy Policy; 1686d249e1d1f1498b81314459ceda19d6ff25c278adDouglas Gregor 1687d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenekpublic: 1688d249e1d1f1498b81314459ceda19d6ff25c278adDouglas Gregor CFGBlockTerminatorPrint(llvm::raw_ostream& os, StmtPrinterHelper* helper, 1689e4f2142d00fa5fdb580c4e2413da91882d955381Chris Lattner const PrintingPolicy &Policy) 1690d249e1d1f1498b81314459ceda19d6ff25c278adDouglas Gregor : OS(os), Helper(helper), Policy(Policy) {} 16916d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 1692d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek void VisitIfStmt(IfStmt* I) { 1693d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek OS << "if "; 1694d249e1d1f1498b81314459ceda19d6ff25c278adDouglas Gregor I->getCond()->printPretty(OS,Helper,Policy); 1695d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek } 16966d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 1697d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek // Default case. 16986d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump void VisitStmt(Stmt* Terminator) { 16996d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump Terminator->printPretty(OS, Helper, Policy); 17006d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump } 17016d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 1702d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek void VisitForStmt(ForStmt* F) { 1703d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek OS << "for (" ; 1704535bb20b6e252809bc17cc59b5d71b5e5e549e70Ted Kremenek if (F->getInit()) OS << "..."; 1705535bb20b6e252809bc17cc59b5d71b5e5e549e70Ted Kremenek OS << "; "; 1706d249e1d1f1498b81314459ceda19d6ff25c278adDouglas Gregor if (Stmt* C = F->getCond()) C->printPretty(OS, Helper, Policy); 1707535bb20b6e252809bc17cc59b5d71b5e5e549e70Ted Kremenek OS << "; "; 1708535bb20b6e252809bc17cc59b5d71b5e5e549e70Ted Kremenek if (F->getInc()) OS << "..."; 1709a292585207adbf6dcf6347db3526a7ec861d8eacTed Kremenek OS << ")"; 1710d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek } 17116d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 1712d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek void VisitWhileStmt(WhileStmt* W) { 1713d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek OS << "while " ; 1714d249e1d1f1498b81314459ceda19d6ff25c278adDouglas Gregor if (Stmt* C = W->getCond()) C->printPretty(OS, Helper, Policy); 1715d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek } 17166d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 1717d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek void VisitDoStmt(DoStmt* D) { 1718d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek OS << "do ... while "; 1719d249e1d1f1498b81314459ceda19d6ff25c278adDouglas Gregor if (Stmt* C = D->getCond()) C->printPretty(OS, Helper, Policy); 17209da2fb773c473b989c78c513c5ce61641e9bbb4dTed Kremenek } 17216d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 1722411cdee0b490f79428c9eb977f25199eb7d21cd8Ted Kremenek void VisitSwitchStmt(SwitchStmt* Terminator) { 17239da2fb773c473b989c78c513c5ce61641e9bbb4dTed Kremenek OS << "switch "; 1724d249e1d1f1498b81314459ceda19d6ff25c278adDouglas Gregor Terminator->getCond()->printPretty(OS, Helper, Policy); 17259da2fb773c473b989c78c513c5ce61641e9bbb4dTed Kremenek } 17266d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 1727805e9a8300af9489ec13cd804c070267b7c4cfecTed Kremenek void VisitConditionalOperator(ConditionalOperator* C) { 1728d249e1d1f1498b81314459ceda19d6ff25c278adDouglas Gregor C->getCond()->printPretty(OS, Helper, Policy); 17296d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump OS << " ? ... : ..."; 1730805e9a8300af9489ec13cd804c070267b7c4cfecTed Kremenek } 17316d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 1732aeddbf689eb3e3afca5117ca83c7b2e18260b0d8Ted Kremenek void VisitChooseExpr(ChooseExpr* C) { 1733aeddbf689eb3e3afca5117ca83c7b2e18260b0d8Ted Kremenek OS << "__builtin_choose_expr( "; 1734d249e1d1f1498b81314459ceda19d6ff25c278adDouglas Gregor C->getCond()->printPretty(OS, Helper, Policy); 1735a292585207adbf6dcf6347db3526a7ec861d8eacTed Kremenek OS << " )"; 1736aeddbf689eb3e3afca5117ca83c7b2e18260b0d8Ted Kremenek } 17376d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 17381c29bba6da40bbe59fb1f81c4cd5ab5471554ffeTed Kremenek void VisitIndirectGotoStmt(IndirectGotoStmt* I) { 17391c29bba6da40bbe59fb1f81c4cd5ab5471554ffeTed Kremenek OS << "goto *"; 1740d249e1d1f1498b81314459ceda19d6ff25c278adDouglas Gregor I->getTarget()->printPretty(OS, Helper, Policy); 17411c29bba6da40bbe59fb1f81c4cd5ab5471554ffeTed Kremenek } 17426d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 1743805e9a8300af9489ec13cd804c070267b7c4cfecTed Kremenek void VisitBinaryOperator(BinaryOperator* B) { 1744805e9a8300af9489ec13cd804c070267b7c4cfecTed Kremenek if (!B->isLogicalOp()) { 1745805e9a8300af9489ec13cd804c070267b7c4cfecTed Kremenek VisitExpr(B); 1746805e9a8300af9489ec13cd804c070267b7c4cfecTed Kremenek return; 1747805e9a8300af9489ec13cd804c070267b7c4cfecTed Kremenek } 17486d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 1749d249e1d1f1498b81314459ceda19d6ff25c278adDouglas Gregor B->getLHS()->printPretty(OS, Helper, Policy); 17506d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 1751805e9a8300af9489ec13cd804c070267b7c4cfecTed Kremenek switch (B->getOpcode()) { 1752805e9a8300af9489ec13cd804c070267b7c4cfecTed Kremenek case BinaryOperator::LOr: 1753a292585207adbf6dcf6347db3526a7ec861d8eacTed Kremenek OS << " || ..."; 1754805e9a8300af9489ec13cd804c070267b7c4cfecTed Kremenek return; 1755805e9a8300af9489ec13cd804c070267b7c4cfecTed Kremenek case BinaryOperator::LAnd: 1756a292585207adbf6dcf6347db3526a7ec861d8eacTed Kremenek OS << " && ..."; 1757805e9a8300af9489ec13cd804c070267b7c4cfecTed Kremenek return; 1758805e9a8300af9489ec13cd804c070267b7c4cfecTed Kremenek default: 1759805e9a8300af9489ec13cd804c070267b7c4cfecTed Kremenek assert(false && "Invalid logical operator."); 17606d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump } 1761805e9a8300af9489ec13cd804c070267b7c4cfecTed Kremenek } 17626d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 17630b1d9b7557437176f9cea1283bfac2510812beceTed Kremenek void VisitExpr(Expr* E) { 1764d249e1d1f1498b81314459ceda19d6ff25c278adDouglas Gregor E->printPretty(OS, Helper, Policy); 17656d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump } 1766d4fdee35477e439759eea5f67ea03ff0c570fabaTed Kremenek}; 1767e4f2142d00fa5fdb580c4e2413da91882d955381Chris Lattner} // end anonymous namespace 1768e4f2142d00fa5fdb580c4e2413da91882d955381Chris Lattner 17696d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 1770e4f2142d00fa5fdb580c4e2413da91882d955381Chris Lattnerstatic void print_stmt(llvm::raw_ostream &OS, StmtPrinterHelper* Helper, 1771e4f2142d00fa5fdb580c4e2413da91882d955381Chris Lattner Stmt* Terminator) { 17721c29bba6da40bbe59fb1f81c4cd5ab5471554ffeTed Kremenek if (Helper) { 17731c29bba6da40bbe59fb1f81c4cd5ab5471554ffeTed Kremenek // special printing for statement-expressions. 1774411cdee0b490f79428c9eb977f25199eb7d21cd8Ted Kremenek if (StmtExpr* SE = dyn_cast<StmtExpr>(Terminator)) { 17751c29bba6da40bbe59fb1f81c4cd5ab5471554ffeTed Kremenek CompoundStmt* Sub = SE->getSubStmt(); 17766d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 17771c29bba6da40bbe59fb1f81c4cd5ab5471554ffeTed Kremenek if (Sub->child_begin() != Sub->child_end()) { 177860266e8a9a4cd941af5e0006a18377dc03f0421bTed Kremenek OS << "({ ... ; "; 17797a9d9d71fa208dc23fd67d03ce052d4ef60a8d04Ted Kremenek Helper->handledStmt(*SE->getSubStmt()->body_rbegin(),OS); 178060266e8a9a4cd941af5e0006a18377dc03f0421bTed Kremenek OS << " })\n"; 17811c29bba6da40bbe59fb1f81c4cd5ab5471554ffeTed Kremenek return; 17821c29bba6da40bbe59fb1f81c4cd5ab5471554ffeTed Kremenek } 17831c29bba6da40bbe59fb1f81c4cd5ab5471554ffeTed Kremenek } 17846d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 17851c29bba6da40bbe59fb1f81c4cd5ab5471554ffeTed Kremenek // special printing for comma expressions. 1786411cdee0b490f79428c9eb977f25199eb7d21cd8Ted Kremenek if (BinaryOperator* B = dyn_cast<BinaryOperator>(Terminator)) { 17871c29bba6da40bbe59fb1f81c4cd5ab5471554ffeTed Kremenek if (B->getOpcode() == BinaryOperator::Comma) { 17881c29bba6da40bbe59fb1f81c4cd5ab5471554ffeTed Kremenek OS << "... , "; 17891c29bba6da40bbe59fb1f81c4cd5ab5471554ffeTed Kremenek Helper->handledStmt(B->getRHS(),OS); 17901c29bba6da40bbe59fb1f81c4cd5ab5471554ffeTed Kremenek OS << '\n'; 17911c29bba6da40bbe59fb1f81c4cd5ab5471554ffeTed Kremenek return; 17926d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump } 17936d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump } 17941c29bba6da40bbe59fb1f81c4cd5ab5471554ffeTed Kremenek } 17956d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 1796e4f2142d00fa5fdb580c4e2413da91882d955381Chris Lattner Terminator->printPretty(OS, Helper, PrintingPolicy(Helper->getLangOpts())); 17976d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 17981c29bba6da40bbe59fb1f81c4cd5ab5471554ffeTed Kremenek // Expressions need a newline. 1799411cdee0b490f79428c9eb977f25199eb7d21cd8Ted Kremenek if (isa<Expr>(Terminator)) OS << '\n'; 18001c29bba6da40bbe59fb1f81c4cd5ab5471554ffeTed Kremenek} 18016d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 1802e4f2142d00fa5fdb580c4e2413da91882d955381Chris Lattnerstatic void print_block(llvm::raw_ostream& OS, const CFG* cfg, 1803e4f2142d00fa5fdb580c4e2413da91882d955381Chris Lattner const CFGBlock& B, 1804e4f2142d00fa5fdb580c4e2413da91882d955381Chris Lattner StmtPrinterHelper* Helper, bool print_edges) { 18056d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 180642a509f6a4f71bb805cc4abbb26722a34dffdddeTed Kremenek if (Helper) Helper->setBlockID(B.getBlockID()); 18076d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 18087dba8607e59096014b7139ff20ef00870041d518Ted Kremenek // Print the header. 18096d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump OS << "\n [ B" << B.getBlockID(); 18106d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 181142a509f6a4f71bb805cc4abbb26722a34dffdddeTed Kremenek if (&B == &cfg->getEntry()) 181242a509f6a4f71bb805cc4abbb26722a34dffdddeTed Kremenek OS << " (ENTRY) ]\n"; 181342a509f6a4f71bb805cc4abbb26722a34dffdddeTed Kremenek else if (&B == &cfg->getExit()) 181442a509f6a4f71bb805cc4abbb26722a34dffdddeTed Kremenek OS << " (EXIT) ]\n"; 181542a509f6a4f71bb805cc4abbb26722a34dffdddeTed Kremenek else if (&B == cfg->getIndirectGotoBlock()) 18167dba8607e59096014b7139ff20ef00870041d518Ted Kremenek OS << " (INDIRECT GOTO DISPATCH) ]\n"; 181742a509f6a4f71bb805cc4abbb26722a34dffdddeTed Kremenek else 181842a509f6a4f71bb805cc4abbb26722a34dffdddeTed Kremenek OS << " ]\n"; 18196d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 18209cffe7366ea3beb33c2d58f43a8c3a04c1873e11Ted Kremenek // Print the label of this block. 1821411cdee0b490f79428c9eb977f25199eb7d21cd8Ted Kremenek if (Stmt* Terminator = const_cast<Stmt*>(B.getLabel())) { 182242a509f6a4f71bb805cc4abbb26722a34dffdddeTed Kremenek 182342a509f6a4f71bb805cc4abbb26722a34dffdddeTed Kremenek if (print_edges) 182442a509f6a4f71bb805cc4abbb26722a34dffdddeTed Kremenek OS << " "; 18256d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 1826411cdee0b490f79428c9eb977f25199eb7d21cd8Ted Kremenek if (LabelStmt* L = dyn_cast<LabelStmt>(Terminator)) 18279cffe7366ea3beb33c2d58f43a8c3a04c1873e11Ted Kremenek OS << L->getName(); 1828411cdee0b490f79428c9eb977f25199eb7d21cd8Ted Kremenek else if (CaseStmt* C = dyn_cast<CaseStmt>(Terminator)) { 18299cffe7366ea3beb33c2d58f43a8c3a04c1873e11Ted Kremenek OS << "case "; 1830e4f2142d00fa5fdb580c4e2413da91882d955381Chris Lattner C->getLHS()->printPretty(OS, Helper, 1831e4f2142d00fa5fdb580c4e2413da91882d955381Chris Lattner PrintingPolicy(Helper->getLangOpts())); 18329cffe7366ea3beb33c2d58f43a8c3a04c1873e11Ted Kremenek if (C->getRHS()) { 18339cffe7366ea3beb33c2d58f43a8c3a04c1873e11Ted Kremenek OS << " ... "; 1834e4f2142d00fa5fdb580c4e2413da91882d955381Chris Lattner C->getRHS()->printPretty(OS, Helper, 1835e4f2142d00fa5fdb580c4e2413da91882d955381Chris Lattner PrintingPolicy(Helper->getLangOpts())); 18369cffe7366ea3beb33c2d58f43a8c3a04c1873e11Ted Kremenek } 18376d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump } else if (isa<DefaultStmt>(Terminator)) 18389cffe7366ea3beb33c2d58f43a8c3a04c1873e11Ted Kremenek OS << "default"; 183942a509f6a4f71bb805cc4abbb26722a34dffdddeTed Kremenek else 184042a509f6a4f71bb805cc4abbb26722a34dffdddeTed Kremenek assert(false && "Invalid label statement in CFGBlock."); 18416d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 18429cffe7366ea3beb33c2d58f43a8c3a04c1873e11Ted Kremenek OS << ":\n"; 18439cffe7366ea3beb33c2d58f43a8c3a04c1873e11Ted Kremenek } 18446d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 1845fddd51853f8ccaa1df2476376e6fd74d2f315c73Ted Kremenek // Iterate through the statements in the block and print them. 1846fddd51853f8ccaa1df2476376e6fd74d2f315c73Ted Kremenek unsigned j = 1; 18476d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 184842a509f6a4f71bb805cc4abbb26722a34dffdddeTed Kremenek for (CFGBlock::const_iterator I = B.begin(), E = B.end() ; 184942a509f6a4f71bb805cc4abbb26722a34dffdddeTed Kremenek I != E ; ++I, ++j ) { 18506d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 18519cffe7366ea3beb33c2d58f43a8c3a04c1873e11Ted Kremenek // Print the statement # in the basic block and the statement itself. 185242a509f6a4f71bb805cc4abbb26722a34dffdddeTed Kremenek if (print_edges) 185342a509f6a4f71bb805cc4abbb26722a34dffdddeTed Kremenek OS << " "; 18546d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 1855a95d3750441ac8ad03e36af8e6e74039c9a3109dTed Kremenek OS << llvm::format("%3d", j) << ": "; 18566d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 185742a509f6a4f71bb805cc4abbb26722a34dffdddeTed Kremenek if (Helper) 185842a509f6a4f71bb805cc4abbb26722a34dffdddeTed Kremenek Helper->setStmtID(j); 18596d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 18601c29bba6da40bbe59fb1f81c4cd5ab5471554ffeTed Kremenek print_stmt(OS,Helper,*I); 1861fddd51853f8ccaa1df2476376e6fd74d2f315c73Ted Kremenek } 18626d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 18639cffe7366ea3beb33c2d58f43a8c3a04c1873e11Ted Kremenek // Print the terminator of this block. 186442a509f6a4f71bb805cc4abbb26722a34dffdddeTed Kremenek if (B.getTerminator()) { 186542a509f6a4f71bb805cc4abbb26722a34dffdddeTed Kremenek if (print_edges) 186642a509f6a4f71bb805cc4abbb26722a34dffdddeTed Kremenek OS << " "; 18676d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 18689cffe7366ea3beb33c2d58f43a8c3a04c1873e11Ted Kremenek OS << " T: "; 18696d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 187042a509f6a4f71bb805cc4abbb26722a34dffdddeTed Kremenek if (Helper) Helper->setBlockID(-1); 18716d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 1872e4f2142d00fa5fdb580c4e2413da91882d955381Chris Lattner CFGBlockTerminatorPrint TPrinter(OS, Helper, 1873e4f2142d00fa5fdb580c4e2413da91882d955381Chris Lattner PrintingPolicy(Helper->getLangOpts())); 187442a509f6a4f71bb805cc4abbb26722a34dffdddeTed Kremenek TPrinter.Visit(const_cast<Stmt*>(B.getTerminator())); 1875a292585207adbf6dcf6347db3526a7ec861d8eacTed Kremenek OS << '\n'; 1876fddd51853f8ccaa1df2476376e6fd74d2f315c73Ted Kremenek } 18776d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 18789cffe7366ea3beb33c2d58f43a8c3a04c1873e11Ted Kremenek if (print_edges) { 18799cffe7366ea3beb33c2d58f43a8c3a04c1873e11Ted Kremenek // Print the predecessors of this block. 188042a509f6a4f71bb805cc4abbb26722a34dffdddeTed Kremenek OS << " Predecessors (" << B.pred_size() << "):"; 18819cffe7366ea3beb33c2d58f43a8c3a04c1873e11Ted Kremenek unsigned i = 0; 188242a509f6a4f71bb805cc4abbb26722a34dffdddeTed Kremenek 188342a509f6a4f71bb805cc4abbb26722a34dffdddeTed Kremenek for (CFGBlock::const_pred_iterator I = B.pred_begin(), E = B.pred_end(); 188442a509f6a4f71bb805cc4abbb26722a34dffdddeTed Kremenek I != E; ++I, ++i) { 18856d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 188642a509f6a4f71bb805cc4abbb26722a34dffdddeTed Kremenek if (i == 8 || (i-8) == 0) 18879cffe7366ea3beb33c2d58f43a8c3a04c1873e11Ted Kremenek OS << "\n "; 18886d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 18899cffe7366ea3beb33c2d58f43a8c3a04c1873e11Ted Kremenek OS << " B" << (*I)->getBlockID(); 18909cffe7366ea3beb33c2d58f43a8c3a04c1873e11Ted Kremenek } 18916d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 18929cffe7366ea3beb33c2d58f43a8c3a04c1873e11Ted Kremenek OS << '\n'; 18936d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 18949cffe7366ea3beb33c2d58f43a8c3a04c1873e11Ted Kremenek // Print the successors of this block. 189542a509f6a4f71bb805cc4abbb26722a34dffdddeTed Kremenek OS << " Successors (" << B.succ_size() << "):"; 18969cffe7366ea3beb33c2d58f43a8c3a04c1873e11Ted Kremenek i = 0; 189742a509f6a4f71bb805cc4abbb26722a34dffdddeTed Kremenek 189842a509f6a4f71bb805cc4abbb26722a34dffdddeTed Kremenek for (CFGBlock::const_succ_iterator I = B.succ_begin(), E = B.succ_end(); 189942a509f6a4f71bb805cc4abbb26722a34dffdddeTed Kremenek I != E; ++I, ++i) { 19006d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 190142a509f6a4f71bb805cc4abbb26722a34dffdddeTed Kremenek if (i == 8 || (i-8) % 10 == 0) 19029cffe7366ea3beb33c2d58f43a8c3a04c1873e11Ted Kremenek OS << "\n "; 190342a509f6a4f71bb805cc4abbb26722a34dffdddeTed Kremenek 1904e5af3ce53ec58995b09381ba645ab2117a46647bMike Stump if (*I) 1905e5af3ce53ec58995b09381ba645ab2117a46647bMike Stump OS << " B" << (*I)->getBlockID(); 1906e5af3ce53ec58995b09381ba645ab2117a46647bMike Stump else 1907e5af3ce53ec58995b09381ba645ab2117a46647bMike Stump OS << " NULL"; 1908fddd51853f8ccaa1df2476376e6fd74d2f315c73Ted Kremenek } 19096d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 19109cffe7366ea3beb33c2d58f43a8c3a04c1873e11Ted Kremenek OS << '\n'; 1911fddd51853f8ccaa1df2476376e6fd74d2f315c73Ted Kremenek } 19126d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump} 191342a509f6a4f71bb805cc4abbb26722a34dffdddeTed Kremenek 191442a509f6a4f71bb805cc4abbb26722a34dffdddeTed Kremenek 191542a509f6a4f71bb805cc4abbb26722a34dffdddeTed Kremenek/// dump - A simple pretty printer of a CFG that outputs to stderr. 1916e4f2142d00fa5fdb580c4e2413da91882d955381Chris Lattnervoid CFG::dump(const LangOptions &LO) const { print(llvm::errs(), LO); } 191742a509f6a4f71bb805cc4abbb26722a34dffdddeTed Kremenek 191842a509f6a4f71bb805cc4abbb26722a34dffdddeTed Kremenek/// print - A simple pretty printer of a CFG that outputs to an ostream. 1919e4f2142d00fa5fdb580c4e2413da91882d955381Chris Lattnervoid CFG::print(llvm::raw_ostream &OS, const LangOptions &LO) const { 1920e4f2142d00fa5fdb580c4e2413da91882d955381Chris Lattner StmtPrinterHelper Helper(this, LO); 19216d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 192242a509f6a4f71bb805cc4abbb26722a34dffdddeTed Kremenek // Print the entry block. 192342a509f6a4f71bb805cc4abbb26722a34dffdddeTed Kremenek print_block(OS, this, getEntry(), &Helper, true); 19246d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 192542a509f6a4f71bb805cc4abbb26722a34dffdddeTed Kremenek // Iterate through the CFGBlocks and print them one by one. 192642a509f6a4f71bb805cc4abbb26722a34dffdddeTed Kremenek for (const_iterator I = Blocks.begin(), E = Blocks.end() ; I != E ; ++I) { 192742a509f6a4f71bb805cc4abbb26722a34dffdddeTed Kremenek // Skip the entry block, because we already printed it. 192842a509f6a4f71bb805cc4abbb26722a34dffdddeTed Kremenek if (&(*I) == &getEntry() || &(*I) == &getExit()) 192942a509f6a4f71bb805cc4abbb26722a34dffdddeTed Kremenek continue; 19306d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 193142a509f6a4f71bb805cc4abbb26722a34dffdddeTed Kremenek print_block(OS, this, *I, &Helper, true); 193242a509f6a4f71bb805cc4abbb26722a34dffdddeTed Kremenek } 19336d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 193442a509f6a4f71bb805cc4abbb26722a34dffdddeTed Kremenek // Print the exit block. 193542a509f6a4f71bb805cc4abbb26722a34dffdddeTed Kremenek print_block(OS, this, getExit(), &Helper, true); 1936d0172439194b28bae62a94a0a25d58e6d21e7a14Ted Kremenek OS.flush(); 19376d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump} 193842a509f6a4f71bb805cc4abbb26722a34dffdddeTed Kremenek 193942a509f6a4f71bb805cc4abbb26722a34dffdddeTed Kremenek/// dump - A simply pretty printer of a CFGBlock that outputs to stderr. 1940e4f2142d00fa5fdb580c4e2413da91882d955381Chris Lattnervoid CFGBlock::dump(const CFG* cfg, const LangOptions &LO) const { 1941e4f2142d00fa5fdb580c4e2413da91882d955381Chris Lattner print(llvm::errs(), cfg, LO); 1942e4f2142d00fa5fdb580c4e2413da91882d955381Chris Lattner} 194342a509f6a4f71bb805cc4abbb26722a34dffdddeTed Kremenek 194442a509f6a4f71bb805cc4abbb26722a34dffdddeTed Kremenek/// print - A simple pretty printer of a CFGBlock that outputs to an ostream. 194542a509f6a4f71bb805cc4abbb26722a34dffdddeTed Kremenek/// Generally this will only be called from CFG::print. 1946e4f2142d00fa5fdb580c4e2413da91882d955381Chris Lattnervoid CFGBlock::print(llvm::raw_ostream& OS, const CFG* cfg, 1947e4f2142d00fa5fdb580c4e2413da91882d955381Chris Lattner const LangOptions &LO) const { 1948e4f2142d00fa5fdb580c4e2413da91882d955381Chris Lattner StmtPrinterHelper Helper(cfg, LO); 194942a509f6a4f71bb805cc4abbb26722a34dffdddeTed Kremenek print_block(OS, cfg, *this, &Helper, true); 1950026473c2175424a039f51ca8949937268721b965Ted Kremenek} 19517dba8607e59096014b7139ff20ef00870041d518Ted Kremenek 1952a292585207adbf6dcf6347db3526a7ec861d8eacTed Kremenek/// printTerminator - A simple pretty printer of the terminator of a CFGBlock. 1953e4f2142d00fa5fdb580c4e2413da91882d955381Chris Lattnervoid CFGBlock::printTerminator(llvm::raw_ostream &OS, 19546d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump const LangOptions &LO) const { 1955e4f2142d00fa5fdb580c4e2413da91882d955381Chris Lattner CFGBlockTerminatorPrint TPrinter(OS, NULL, PrintingPolicy(LO)); 1956a292585207adbf6dcf6347db3526a7ec861d8eacTed Kremenek TPrinter.Visit(const_cast<Stmt*>(getTerminator())); 1957a292585207adbf6dcf6347db3526a7ec861d8eacTed Kremenek} 1958a292585207adbf6dcf6347db3526a7ec861d8eacTed Kremenek 1959390e48b15ad93f85bfd1e33b9992c198fa0db475Ted KremenekStmt* CFGBlock::getTerminatorCondition() { 19606d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 1961411cdee0b490f79428c9eb977f25199eb7d21cd8Ted Kremenek if (!Terminator) 1962411cdee0b490f79428c9eb977f25199eb7d21cd8Ted Kremenek return NULL; 19636d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 1964411cdee0b490f79428c9eb977f25199eb7d21cd8Ted Kremenek Expr* E = NULL; 19656d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 1966411cdee0b490f79428c9eb977f25199eb7d21cd8Ted Kremenek switch (Terminator->getStmtClass()) { 1967411cdee0b490f79428c9eb977f25199eb7d21cd8Ted Kremenek default: 1968411cdee0b490f79428c9eb977f25199eb7d21cd8Ted Kremenek break; 19696d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 1970411cdee0b490f79428c9eb977f25199eb7d21cd8Ted Kremenek case Stmt::ForStmtClass: 1971411cdee0b490f79428c9eb977f25199eb7d21cd8Ted Kremenek E = cast<ForStmt>(Terminator)->getCond(); 1972411cdee0b490f79428c9eb977f25199eb7d21cd8Ted Kremenek break; 19736d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 1974411cdee0b490f79428c9eb977f25199eb7d21cd8Ted Kremenek case Stmt::WhileStmtClass: 1975411cdee0b490f79428c9eb977f25199eb7d21cd8Ted Kremenek E = cast<WhileStmt>(Terminator)->getCond(); 1976411cdee0b490f79428c9eb977f25199eb7d21cd8Ted Kremenek break; 19776d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 1978411cdee0b490f79428c9eb977f25199eb7d21cd8Ted Kremenek case Stmt::DoStmtClass: 1979411cdee0b490f79428c9eb977f25199eb7d21cd8Ted Kremenek E = cast<DoStmt>(Terminator)->getCond(); 1980411cdee0b490f79428c9eb977f25199eb7d21cd8Ted Kremenek break; 19816d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 1982411cdee0b490f79428c9eb977f25199eb7d21cd8Ted Kremenek case Stmt::IfStmtClass: 1983411cdee0b490f79428c9eb977f25199eb7d21cd8Ted Kremenek E = cast<IfStmt>(Terminator)->getCond(); 1984411cdee0b490f79428c9eb977f25199eb7d21cd8Ted Kremenek break; 19856d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 1986411cdee0b490f79428c9eb977f25199eb7d21cd8Ted Kremenek case Stmt::ChooseExprClass: 1987411cdee0b490f79428c9eb977f25199eb7d21cd8Ted Kremenek E = cast<ChooseExpr>(Terminator)->getCond(); 1988411cdee0b490f79428c9eb977f25199eb7d21cd8Ted Kremenek break; 19896d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 1990411cdee0b490f79428c9eb977f25199eb7d21cd8Ted Kremenek case Stmt::IndirectGotoStmtClass: 1991411cdee0b490f79428c9eb977f25199eb7d21cd8Ted Kremenek E = cast<IndirectGotoStmt>(Terminator)->getTarget(); 1992411cdee0b490f79428c9eb977f25199eb7d21cd8Ted Kremenek break; 19936d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 1994411cdee0b490f79428c9eb977f25199eb7d21cd8Ted Kremenek case Stmt::SwitchStmtClass: 1995411cdee0b490f79428c9eb977f25199eb7d21cd8Ted Kremenek E = cast<SwitchStmt>(Terminator)->getCond(); 1996411cdee0b490f79428c9eb977f25199eb7d21cd8Ted Kremenek break; 19976d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 1998411cdee0b490f79428c9eb977f25199eb7d21cd8Ted Kremenek case Stmt::ConditionalOperatorClass: 1999411cdee0b490f79428c9eb977f25199eb7d21cd8Ted Kremenek E = cast<ConditionalOperator>(Terminator)->getCond(); 2000411cdee0b490f79428c9eb977f25199eb7d21cd8Ted Kremenek break; 20016d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 2002411cdee0b490f79428c9eb977f25199eb7d21cd8Ted Kremenek case Stmt::BinaryOperatorClass: // '&&' and '||' 2003411cdee0b490f79428c9eb977f25199eb7d21cd8Ted Kremenek E = cast<BinaryOperator>(Terminator)->getLHS(); 2004390e48b15ad93f85bfd1e33b9992c198fa0db475Ted Kremenek break; 20056d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 2006390e48b15ad93f85bfd1e33b9992c198fa0db475Ted Kremenek case Stmt::ObjCForCollectionStmtClass: 20076d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump return Terminator; 2008411cdee0b490f79428c9eb977f25199eb7d21cd8Ted Kremenek } 20096d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 2010411cdee0b490f79428c9eb977f25199eb7d21cd8Ted Kremenek return E ? E->IgnoreParens() : NULL; 2011411cdee0b490f79428c9eb977f25199eb7d21cd8Ted Kremenek} 2012411cdee0b490f79428c9eb977f25199eb7d21cd8Ted Kremenek 20139c2535a35db35b3a821a0d0c36a01a16f52f1ad0Ted Kremenekbool CFGBlock::hasBinaryBranchTerminator() const { 20146d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 20159c2535a35db35b3a821a0d0c36a01a16f52f1ad0Ted Kremenek if (!Terminator) 20169c2535a35db35b3a821a0d0c36a01a16f52f1ad0Ted Kremenek return false; 20176d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 20189c2535a35db35b3a821a0d0c36a01a16f52f1ad0Ted Kremenek Expr* E = NULL; 20196d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 20209c2535a35db35b3a821a0d0c36a01a16f52f1ad0Ted Kremenek switch (Terminator->getStmtClass()) { 20219c2535a35db35b3a821a0d0c36a01a16f52f1ad0Ted Kremenek default: 20229c2535a35db35b3a821a0d0c36a01a16f52f1ad0Ted Kremenek return false; 20236d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 20246d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump case Stmt::ForStmtClass: 20259c2535a35db35b3a821a0d0c36a01a16f52f1ad0Ted Kremenek case Stmt::WhileStmtClass: 20269c2535a35db35b3a821a0d0c36a01a16f52f1ad0Ted Kremenek case Stmt::DoStmtClass: 20279c2535a35db35b3a821a0d0c36a01a16f52f1ad0Ted Kremenek case Stmt::IfStmtClass: 20289c2535a35db35b3a821a0d0c36a01a16f52f1ad0Ted Kremenek case Stmt::ChooseExprClass: 20299c2535a35db35b3a821a0d0c36a01a16f52f1ad0Ted Kremenek case Stmt::ConditionalOperatorClass: 20309c2535a35db35b3a821a0d0c36a01a16f52f1ad0Ted Kremenek case Stmt::BinaryOperatorClass: 20316d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump return true; 20329c2535a35db35b3a821a0d0c36a01a16f52f1ad0Ted Kremenek } 20336d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 20349c2535a35db35b3a821a0d0c36a01a16f52f1ad0Ted Kremenek return E ? E->IgnoreParens() : NULL; 20359c2535a35db35b3a821a0d0c36a01a16f52f1ad0Ted Kremenek} 20369c2535a35db35b3a821a0d0c36a01a16f52f1ad0Ted Kremenek 2037a292585207adbf6dcf6347db3526a7ec861d8eacTed Kremenek 20387dba8607e59096014b7139ff20ef00870041d518Ted Kremenek//===----------------------------------------------------------------------===// 20397dba8607e59096014b7139ff20ef00870041d518Ted Kremenek// CFG Graphviz Visualization 20407dba8607e59096014b7139ff20ef00870041d518Ted Kremenek//===----------------------------------------------------------------------===// 20417dba8607e59096014b7139ff20ef00870041d518Ted Kremenek 204242a509f6a4f71bb805cc4abbb26722a34dffdddeTed Kremenek 204342a509f6a4f71bb805cc4abbb26722a34dffdddeTed Kremenek#ifndef NDEBUG 20446d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stumpstatic StmtPrinterHelper* GraphHelper; 204542a509f6a4f71bb805cc4abbb26722a34dffdddeTed Kremenek#endif 204642a509f6a4f71bb805cc4abbb26722a34dffdddeTed Kremenek 2047e4f2142d00fa5fdb580c4e2413da91882d955381Chris Lattnervoid CFG::viewCFG(const LangOptions &LO) const { 204842a509f6a4f71bb805cc4abbb26722a34dffdddeTed Kremenek#ifndef NDEBUG 2049e4f2142d00fa5fdb580c4e2413da91882d955381Chris Lattner StmtPrinterHelper H(this, LO); 205042a509f6a4f71bb805cc4abbb26722a34dffdddeTed Kremenek GraphHelper = &H; 205142a509f6a4f71bb805cc4abbb26722a34dffdddeTed Kremenek llvm::ViewGraph(this,"CFG"); 205242a509f6a4f71bb805cc4abbb26722a34dffdddeTed Kremenek GraphHelper = NULL; 205342a509f6a4f71bb805cc4abbb26722a34dffdddeTed Kremenek#endif 205442a509f6a4f71bb805cc4abbb26722a34dffdddeTed Kremenek} 205542a509f6a4f71bb805cc4abbb26722a34dffdddeTed Kremenek 20567dba8607e59096014b7139ff20ef00870041d518Ted Kremeneknamespace llvm { 20577dba8607e59096014b7139ff20ef00870041d518Ted Kremenektemplate<> 20587dba8607e59096014b7139ff20ef00870041d518Ted Kremenekstruct DOTGraphTraits<const CFG*> : public DefaultDOTGraphTraits { 205902995ce680d1bcf9f17bcfdf759bd74b08aa3948Owen Anderson static std::string getNodeLabel(const CFGBlock* Node, const CFG* Graph, 206002995ce680d1bcf9f17bcfdf759bd74b08aa3948Owen Anderson bool ShortNames) { 20617dba8607e59096014b7139ff20ef00870041d518Ted Kremenek 2062bd250b44d60622e7c0b60c6def6f6fe7e347addfHartmut Kaiser#ifndef NDEBUG 2063a95d3750441ac8ad03e36af8e6e74039c9a3109dTed Kremenek std::string OutSStr; 2064a95d3750441ac8ad03e36af8e6e74039c9a3109dTed Kremenek llvm::raw_string_ostream Out(OutSStr); 206542a509f6a4f71bb805cc4abbb26722a34dffdddeTed Kremenek print_block(Out,Graph, *Node, GraphHelper, false); 2066a95d3750441ac8ad03e36af8e6e74039c9a3109dTed Kremenek std::string& OutStr = Out.str(); 20677dba8607e59096014b7139ff20ef00870041d518Ted Kremenek 20687dba8607e59096014b7139ff20ef00870041d518Ted Kremenek if (OutStr[0] == '\n') OutStr.erase(OutStr.begin()); 20697dba8607e59096014b7139ff20ef00870041d518Ted Kremenek 20707dba8607e59096014b7139ff20ef00870041d518Ted Kremenek // Process string output to make it nicer... 20717dba8607e59096014b7139ff20ef00870041d518Ted Kremenek for (unsigned i = 0; i != OutStr.length(); ++i) 20727dba8607e59096014b7139ff20ef00870041d518Ted Kremenek if (OutStr[i] == '\n') { // Left justify 20737dba8607e59096014b7139ff20ef00870041d518Ted Kremenek OutStr[i] = '\\'; 20747dba8607e59096014b7139ff20ef00870041d518Ted Kremenek OutStr.insert(OutStr.begin()+i+1, 'l'); 20757dba8607e59096014b7139ff20ef00870041d518Ted Kremenek } 20766d9828c82c9321f042ab416fd2ffaa3034347d45Mike Stump 20777dba8607e59096014b7139ff20ef00870041d518Ted Kremenek return OutStr; 2078bd250b44d60622e7c0b60c6def6f6fe7e347addfHartmut Kaiser#else 2079bd250b44d60622e7c0b60c6def6f6fe7e347addfHartmut Kaiser return ""; 2080bd250b44d60622e7c0b60c6def6f6fe7e347addfHartmut Kaiser#endif 20817dba8607e59096014b7139ff20ef00870041d518Ted Kremenek } 20827dba8607e59096014b7139ff20ef00870041d518Ted Kremenek}; 20837dba8607e59096014b7139ff20ef00870041d518Ted Kremenek} // end namespace llvm 2084