ExprEngineCallAndReturn.cpp revision 3a0a9e3e8bbaa45f3ca22b1e20b3beaac0f5861e
1294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek//=-- ExprEngineCallAndReturn.cpp - Support for call/return -----*- C++ -*-===// 2294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek// 3294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek// The LLVM Compiler Infrastructure 4294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek// 5294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek// This file is distributed under the University of Illinois Open Source 6294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek// License. See LICENSE.TXT for details. 7294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek// 8294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek//===----------------------------------------------------------------------===// 9294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek// 10294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek// This file defines ExprEngine's support for calls and returns. 11294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek// 12294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek//===----------------------------------------------------------------------===// 13294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 14d4aeb8050a1d0fe47c53a73361c8b0b8ac310f46Ted Kremenek#include "clang/Analysis/Analyses/LiveVariables.h" 15294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek#include "clang/StaticAnalyzer/Core/CheckerManager.h" 16294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek#include "clang/StaticAnalyzer/Core/PathSensitive/ExprEngine.h" 17740d490593e0de8732a697c9f77b90ddd463863bJordan Rose#include "clang/StaticAnalyzer/Core/PathSensitive/Calls.h" 18294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek#include "clang/AST/DeclCXX.h" 194a5f724538cbc275370c9504e8169ce92503256cBenjamin Kramer#include "llvm/ADT/SmallSet.h" 204a5f724538cbc275370c9504e8169ce92503256cBenjamin Kramer#include "llvm/Support/SaveAndRestore.h" 21294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 22294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenekusing namespace clang; 23294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenekusing namespace ento; 24294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 25fdaa33818cf9bad8d092136e73bd2e489cb821baJordan Rosestatic CallEventKind classifyCallExpr(const CallExpr *CE) { 26fdaa33818cf9bad8d092136e73bd2e489cb821baJordan Rose if (isa<CXXMemberCallExpr>(CE)) 27fdaa33818cf9bad8d092136e73bd2e489cb821baJordan Rose return CE_CXXMember; 28fdaa33818cf9bad8d092136e73bd2e489cb821baJordan Rose 29fdaa33818cf9bad8d092136e73bd2e489cb821baJordan Rose const CXXOperatorCallExpr *OpCE = dyn_cast<CXXOperatorCallExpr>(CE); 30fdaa33818cf9bad8d092136e73bd2e489cb821baJordan Rose if (OpCE) { 31fdaa33818cf9bad8d092136e73bd2e489cb821baJordan Rose const FunctionDecl *DirectCallee = CE->getDirectCallee(); 32fdaa33818cf9bad8d092136e73bd2e489cb821baJordan Rose if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(DirectCallee)) 33fdaa33818cf9bad8d092136e73bd2e489cb821baJordan Rose if (MD->isInstance()) 34fdaa33818cf9bad8d092136e73bd2e489cb821baJordan Rose return CE_CXXMemberOperator; 35fdaa33818cf9bad8d092136e73bd2e489cb821baJordan Rose } else if (CE->getCallee()->getType()->isBlockPointerType()) { 36fdaa33818cf9bad8d092136e73bd2e489cb821baJordan Rose return CE_Block; 37fdaa33818cf9bad8d092136e73bd2e489cb821baJordan Rose } 38fdaa33818cf9bad8d092136e73bd2e489cb821baJordan Rose 39fdaa33818cf9bad8d092136e73bd2e489cb821baJordan Rose return CE_Function; 40fdaa33818cf9bad8d092136e73bd2e489cb821baJordan Rose} 41fdaa33818cf9bad8d092136e73bd2e489cb821baJordan Rose 423070e13dca5bbefa32acb80ce4a7b217a6220983Ted Kremenekvoid ExprEngine::processCallEnter(CallEnter CE, ExplodedNode *Pred) { 433070e13dca5bbefa32acb80ce4a7b217a6220983Ted Kremenek // Get the entry block in the CFG of the callee. 440849ade4bb3e90c2fc0ce01ccd330f76f91da732Ted Kremenek const StackFrameContext *calleeCtx = CE.getCalleeContext(); 450849ade4bb3e90c2fc0ce01ccd330f76f91da732Ted Kremenek const CFG *CalleeCFG = calleeCtx->getCFG(); 463070e13dca5bbefa32acb80ce4a7b217a6220983Ted Kremenek const CFGBlock *Entry = &(CalleeCFG->getEntry()); 473070e13dca5bbefa32acb80ce4a7b217a6220983Ted Kremenek 483070e13dca5bbefa32acb80ce4a7b217a6220983Ted Kremenek // Validate the CFG. 493070e13dca5bbefa32acb80ce4a7b217a6220983Ted Kremenek assert(Entry->empty()); 503070e13dca5bbefa32acb80ce4a7b217a6220983Ted Kremenek assert(Entry->succ_size() == 1); 513070e13dca5bbefa32acb80ce4a7b217a6220983Ted Kremenek 523070e13dca5bbefa32acb80ce4a7b217a6220983Ted Kremenek // Get the solitary sucessor. 533070e13dca5bbefa32acb80ce4a7b217a6220983Ted Kremenek const CFGBlock *Succ = *(Entry->succ_begin()); 543070e13dca5bbefa32acb80ce4a7b217a6220983Ted Kremenek 553070e13dca5bbefa32acb80ce4a7b217a6220983Ted Kremenek // Construct an edge representing the starting location in the callee. 560849ade4bb3e90c2fc0ce01ccd330f76f91da732Ted Kremenek BlockEdge Loc(Entry, Succ, calleeCtx); 573070e13dca5bbefa32acb80ce4a7b217a6220983Ted Kremenek 58e54cfc7b9990acffd0a8a4ba381717b4bb9f3011Jordan Rose ProgramStateRef state = Pred->getState(); 593070e13dca5bbefa32acb80ce4a7b217a6220983Ted Kremenek 603070e13dca5bbefa32acb80ce4a7b217a6220983Ted Kremenek // Construct a new node and add it to the worklist. 613070e13dca5bbefa32acb80ce4a7b217a6220983Ted Kremenek bool isNew; 623070e13dca5bbefa32acb80ce4a7b217a6220983Ted Kremenek ExplodedNode *Node = G.getNode(Loc, state, false, &isNew); 633070e13dca5bbefa32acb80ce4a7b217a6220983Ted Kremenek Node->addPredecessor(Pred, G); 643070e13dca5bbefa32acb80ce4a7b217a6220983Ted Kremenek if (isNew) 653070e13dca5bbefa32acb80ce4a7b217a6220983Ted Kremenek Engine.getWorkList()->enqueue(Node); 66294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek} 67294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 680b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks// Find the last statement on the path to the exploded node and the 690b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks// corresponding Block. 700b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaksstatic std::pair<const Stmt*, 710b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks const CFGBlock*> getLastStmt(const ExplodedNode *Node) { 720b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks const Stmt *S = 0; 730b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks const StackFrameContext *SF = 740b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks Node->getLocation().getLocationContext()->getCurrentStackFrame(); 75888c90ac0ef6baf7d47e86cf5cc4715707d223b1Jordan Rose 76888c90ac0ef6baf7d47e86cf5cc4715707d223b1Jordan Rose // Back up through the ExplodedGraph until we reach a statement node. 77256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek while (Node) { 78256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek const ProgramPoint &PP = Node->getLocation(); 79888c90ac0ef6baf7d47e86cf5cc4715707d223b1Jordan Rose 80256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek if (const StmtPoint *SP = dyn_cast<StmtPoint>(&PP)) { 810b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks S = SP->getStmt(); 820b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks break; 83888c90ac0ef6baf7d47e86cf5cc4715707d223b1Jordan Rose } else if (const CallExitEnd *CEE = dyn_cast<CallExitEnd>(&PP)) { 84888c90ac0ef6baf7d47e86cf5cc4715707d223b1Jordan Rose S = CEE->getCalleeContext()->getCallSite(); 85888c90ac0ef6baf7d47e86cf5cc4715707d223b1Jordan Rose if (S) 86888c90ac0ef6baf7d47e86cf5cc4715707d223b1Jordan Rose break; 87888c90ac0ef6baf7d47e86cf5cc4715707d223b1Jordan Rose // If we have an implicit call, we'll probably end up with a 88888c90ac0ef6baf7d47e86cf5cc4715707d223b1Jordan Rose // StmtPoint inside the callee, which is acceptable. 89888c90ac0ef6baf7d47e86cf5cc4715707d223b1Jordan Rose // (It's possible a function ONLY contains implicit calls -- such as an 90888c90ac0ef6baf7d47e86cf5cc4715707d223b1Jordan Rose // implicitly-generated destructor -- so we shouldn't just skip back to 91888c90ac0ef6baf7d47e86cf5cc4715707d223b1Jordan Rose // the CallEnter node and keep going.) 92888c90ac0ef6baf7d47e86cf5cc4715707d223b1Jordan Rose } else if (const CallEnter *CE = dyn_cast<CallEnter>(&PP)) { 93888c90ac0ef6baf7d47e86cf5cc4715707d223b1Jordan Rose // If we reached the CallEnter for this function, it has no statements. 94888c90ac0ef6baf7d47e86cf5cc4715707d223b1Jordan Rose if (CE->getCalleeContext() == SF) 95888c90ac0ef6baf7d47e86cf5cc4715707d223b1Jordan Rose break; 96256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek } 97888c90ac0ef6baf7d47e86cf5cc4715707d223b1Jordan Rose 98888c90ac0ef6baf7d47e86cf5cc4715707d223b1Jordan Rose Node = *Node->pred_begin(); 99256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek } 100888c90ac0ef6baf7d47e86cf5cc4715707d223b1Jordan Rose 101888c90ac0ef6baf7d47e86cf5cc4715707d223b1Jordan Rose const CFGBlock *Blk = 0; 102888c90ac0ef6baf7d47e86cf5cc4715707d223b1Jordan Rose if (S) { 103888c90ac0ef6baf7d47e86cf5cc4715707d223b1Jordan Rose // Now, get the enclosing basic block. 104888c90ac0ef6baf7d47e86cf5cc4715707d223b1Jordan Rose while (Node && Node->pred_size() >=1 ) { 105888c90ac0ef6baf7d47e86cf5cc4715707d223b1Jordan Rose const ProgramPoint &PP = Node->getLocation(); 106888c90ac0ef6baf7d47e86cf5cc4715707d223b1Jordan Rose if (isa<BlockEdge>(PP) && 107888c90ac0ef6baf7d47e86cf5cc4715707d223b1Jordan Rose (PP.getLocationContext()->getCurrentStackFrame() == SF)) { 108888c90ac0ef6baf7d47e86cf5cc4715707d223b1Jordan Rose BlockEdge &EPP = cast<BlockEdge>(PP); 109888c90ac0ef6baf7d47e86cf5cc4715707d223b1Jordan Rose Blk = EPP.getDst(); 110888c90ac0ef6baf7d47e86cf5cc4715707d223b1Jordan Rose break; 111888c90ac0ef6baf7d47e86cf5cc4715707d223b1Jordan Rose } 112888c90ac0ef6baf7d47e86cf5cc4715707d223b1Jordan Rose Node = *Node->pred_begin(); 113888c90ac0ef6baf7d47e86cf5cc4715707d223b1Jordan Rose } 114888c90ac0ef6baf7d47e86cf5cc4715707d223b1Jordan Rose } 115888c90ac0ef6baf7d47e86cf5cc4715707d223b1Jordan Rose 1160b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks return std::pair<const Stmt*, const CFGBlock*>(S, Blk); 117256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek} 118256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek 1190b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks/// The call exit is simulated with a sequence of nodes, which occur between 1200b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks/// CallExitBegin and CallExitEnd. The following operations occur between the 1210b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks/// two program points: 1220b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks/// 1. CallExitBegin (triggers the start of call exit sequence) 1230b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks/// 2. Bind the return value 1240b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks/// 3. Run Remove dead bindings to clean up the dead symbols from the callee. 1250b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks/// 4. CallExitEnd (switch to the caller context) 1260b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks/// 5. PostStmt<CallExpr> 1270b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaksvoid ExprEngine::processCallExit(ExplodedNode *CEBNode) { 1280b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks // Step 1 CEBNode was generated before the call. 1290b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks 1300b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks const StackFrameContext *calleeCtx = 1310b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks CEBNode->getLocationContext()->getCurrentStackFrame(); 1327fa9b4f258636d89342eda28f21a986c8ac353b1Ted Kremenek 1337fa9b4f258636d89342eda28f21a986c8ac353b1Ted Kremenek // The parent context might not be a stack frame, so make sure we 1347fa9b4f258636d89342eda28f21a986c8ac353b1Ted Kremenek // look up the first enclosing stack frame. 1357fa9b4f258636d89342eda28f21a986c8ac353b1Ted Kremenek const StackFrameContext *callerCtx = 1367fa9b4f258636d89342eda28f21a986c8ac353b1Ted Kremenek calleeCtx->getParent()->getCurrentStackFrame(); 1377fa9b4f258636d89342eda28f21a986c8ac353b1Ted Kremenek 138294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek const Stmt *CE = calleeCtx->getCallSite(); 1390b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks ProgramStateRef state = CEBNode->getState(); 1400b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks // Find the last statement in the function and the corresponding basic block. 1410b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks const Stmt *LastSt = 0; 1420b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks const CFGBlock *Blk = 0; 1430b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks llvm::tie(LastSt, Blk) = getLastStmt(CEBNode); 1440b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks 145852aa0d2c5d2d1faf2d77b5aa3c0848068a342c5Jordan Rose // Step 2: generate node with bound return value: CEBNode -> BindedRetNode. 1460b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks 147294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // If the callee returns an expression, bind its value to CallExpr. 148852aa0d2c5d2d1faf2d77b5aa3c0848068a342c5Jordan Rose if (CE) { 149852aa0d2c5d2d1faf2d77b5aa3c0848068a342c5Jordan Rose if (const ReturnStmt *RS = dyn_cast_or_null<ReturnStmt>(LastSt)) { 150852aa0d2c5d2d1faf2d77b5aa3c0848068a342c5Jordan Rose const LocationContext *LCtx = CEBNode->getLocationContext(); 151852aa0d2c5d2d1faf2d77b5aa3c0848068a342c5Jordan Rose SVal V = state->getSVal(RS, LCtx); 15248b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose state = state->BindExpr(CE, calleeCtx->getParent(), V); 153852aa0d2c5d2d1faf2d77b5aa3c0848068a342c5Jordan Rose } 1540b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks 155852aa0d2c5d2d1faf2d77b5aa3c0848068a342c5Jordan Rose // Bind the constructed object value to CXXConstructExpr. 156852aa0d2c5d2d1faf2d77b5aa3c0848068a342c5Jordan Rose if (const CXXConstructExpr *CCE = dyn_cast<CXXConstructExpr>(CE)) { 157852aa0d2c5d2d1faf2d77b5aa3c0848068a342c5Jordan Rose loc::MemRegionVal This = 158852aa0d2c5d2d1faf2d77b5aa3c0848068a342c5Jordan Rose svalBuilder.getCXXThis(CCE->getConstructor()->getParent(), calleeCtx); 159852aa0d2c5d2d1faf2d77b5aa3c0848068a342c5Jordan Rose SVal ThisV = state->getSVal(This); 1600b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks 161852aa0d2c5d2d1faf2d77b5aa3c0848068a342c5Jordan Rose // Always bind the region to the CXXConstructExpr. 16248b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose state = state->BindExpr(CCE, calleeCtx->getParent(), ThisV); 163852aa0d2c5d2d1faf2d77b5aa3c0848068a342c5Jordan Rose } 164294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 1650b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks 1660b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks // Step 3: BindedRetNode -> CleanedNodes 1670b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks // If we can find a statement and a block in the inlined function, run remove 1680b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks // dead bindings before returning from the call. This is important to ensure 1690b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks // that we report the issues such as leaks in the stack contexts in which 1700b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks // they occurred. 1710b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks ExplodedNodeSet CleanedNodes; 1720b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks if (LastSt && Blk) { 17348b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose static SimpleProgramPointTag retValBind("ExprEngine : Bind Return Value"); 17448b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose PostStmt Loc(LastSt, calleeCtx, &retValBind); 17548b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose bool isNew; 17648b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose ExplodedNode *BindedRetNode = G.getNode(Loc, state, false, &isNew); 17748b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose BindedRetNode->addPredecessor(CEBNode, G); 17848b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose if (!isNew) 17948b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose return; 18048b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose 1810b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks NodeBuilderContext Ctx(getCoreEngine(), Blk, BindedRetNode); 1820b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks currentBuilderContext = &Ctx; 1830b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks // Here, we call the Symbol Reaper with 0 statement and caller location 1840b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks // context, telling it to clean up everything in the callee's context 1850b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks // (and it's children). We use LastStmt as a diagnostic statement, which 1860b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks // which the PreStmtPurge Dead point will be associated. 1870b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks removeDead(BindedRetNode, CleanedNodes, 0, callerCtx, LastSt, 1880b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks ProgramPoint::PostStmtPurgeDeadSymbolsKind); 1890b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks currentBuilderContext = 0; 190144e52be486a3906aec90c51b0ac94a30313152eAnna Zaks } else { 191144e52be486a3906aec90c51b0ac94a30313152eAnna Zaks CleanedNodes.Add(CEBNode); 1920b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks } 1930b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks 1940b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks for (ExplodedNodeSet::iterator I = CleanedNodes.begin(), 1950b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks E = CleanedNodes.end(); I != E; ++I) { 1960b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks 1970b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks // Step 4: Generate the CallExit and leave the callee's context. 1980b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks // CleanedNodes -> CEENode 199852aa0d2c5d2d1faf2d77b5aa3c0848068a342c5Jordan Rose CallExitEnd Loc(calleeCtx, callerCtx); 2000b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks bool isNew; 20148b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose ProgramStateRef CEEState = (*I == CEBNode) ? state : (*I)->getState(); 20248b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose ExplodedNode *CEENode = G.getNode(Loc, CEEState, false, &isNew); 2030b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks CEENode->addPredecessor(*I, G); 2040b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks if (!isNew) 2050b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks return; 2060b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks 2070b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks // Step 5: Perform the post-condition check of the CallExpr and enqueue the 2080b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks // result onto the work list. 2090b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks // CEENode -> Dst -> WorkList 2100b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks ExplodedNodeSet Dst; 2110b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks NodeBuilderContext Ctx(Engine, calleeCtx->getCallSiteBlock(), CEENode); 2120b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks SaveAndRestore<const NodeBuilderContext*> NBCSave(currentBuilderContext, 2130b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks &Ctx); 2140b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks SaveAndRestore<unsigned> CBISave(currentStmtIdx, calleeCtx->getIndex()); 2150b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks 216852aa0d2c5d2d1faf2d77b5aa3c0848068a342c5Jordan Rose // FIXME: This needs to call PostCall. 21748b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose // FIXME: If/when we inline Objective-C messages, this also needs to call 21848b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose // PostObjCMessage. 219852aa0d2c5d2d1faf2d77b5aa3c0848068a342c5Jordan Rose if (CE) 220852aa0d2c5d2d1faf2d77b5aa3c0848068a342c5Jordan Rose getCheckerManager().runCheckersForPostStmt(Dst, CEENode, CE, *this, true); 22148b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose else 22248b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose Dst.Add(CEENode); 2230b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks 2240b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks // Enqueue the next element in the block. 2250b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks for (ExplodedNodeSet::iterator PSI = Dst.begin(), PSE = Dst.end(); 2260b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks PSI != PSE; ++PSI) { 2270b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks Engine.getWorkList()->enqueue(*PSI, calleeCtx->getCallSiteBlock(), 2280b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks calleeCtx->getIndex()+1); 2290b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks } 230242384ddb0e0b65dd7e9e0ac0cf3c31cf98b06a6Ted Kremenek } 231294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek} 232294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 2330849ade4bb3e90c2fc0ce01ccd330f76f91da732Ted Kremenekstatic unsigned getNumberStackFrames(const LocationContext *LCtx) { 2340849ade4bb3e90c2fc0ce01ccd330f76f91da732Ted Kremenek unsigned count = 0; 2350849ade4bb3e90c2fc0ce01ccd330f76f91da732Ted Kremenek while (LCtx) { 2360849ade4bb3e90c2fc0ce01ccd330f76f91da732Ted Kremenek if (isa<StackFrameContext>(LCtx)) 2370849ade4bb3e90c2fc0ce01ccd330f76f91da732Ted Kremenek ++count; 2380849ade4bb3e90c2fc0ce01ccd330f76f91da732Ted Kremenek LCtx = LCtx->getParent(); 2390849ade4bb3e90c2fc0ce01ccd330f76f91da732Ted Kremenek } 2400849ade4bb3e90c2fc0ce01ccd330f76f91da732Ted Kremenek return count; 2410849ade4bb3e90c2fc0ce01ccd330f76f91da732Ted Kremenek} 2420849ade4bb3e90c2fc0ce01ccd330f76f91da732Ted Kremenek 2436cc0969ab37c614d6cf496f2ed6d2fca397a0133Anna Zaks// Determine if we should inline the call. 2447fa9b4f258636d89342eda28f21a986c8ac353b1Ted Kremenekbool ExprEngine::shouldInlineDecl(const Decl *D, ExplodedNode *Pred) { 2457fa9b4f258636d89342eda28f21a986c8ac353b1Ted Kremenek AnalysisDeclContext *CalleeADC = AMgr.getAnalysisDeclContext(D); 2466cc0969ab37c614d6cf496f2ed6d2fca397a0133Anna Zaks const CFG *CalleeCFG = CalleeADC->getCFG(); 2476cc0969ab37c614d6cf496f2ed6d2fca397a0133Anna Zaks 24801561d1039bfdda61edd20eed939011a8632c7c7Ted Kremenek // It is possible that the CFG cannot be constructed. 24901561d1039bfdda61edd20eed939011a8632c7c7Ted Kremenek // Be safe, and check if the CalleeCFG is valid. 25001561d1039bfdda61edd20eed939011a8632c7c7Ted Kremenek if (!CalleeCFG) 25101561d1039bfdda61edd20eed939011a8632c7c7Ted Kremenek return false; 25201561d1039bfdda61edd20eed939011a8632c7c7Ted Kremenek 2536cc0969ab37c614d6cf496f2ed6d2fca397a0133Anna Zaks if (getNumberStackFrames(Pred->getLocationContext()) 2546cc0969ab37c614d6cf496f2ed6d2fca397a0133Anna Zaks == AMgr.InlineMaxStackDepth) 2556cc0969ab37c614d6cf496f2ed6d2fca397a0133Anna Zaks return false; 2566cc0969ab37c614d6cf496f2ed6d2fca397a0133Anna Zaks 2577fa9b4f258636d89342eda28f21a986c8ac353b1Ted Kremenek if (Engine.FunctionSummaries->hasReachedMaxBlockCount(D)) 2583bbd8cd831788c506f2980293eb3c7e1b3ca2501Anna Zaks return false; 2593bbd8cd831788c506f2980293eb3c7e1b3ca2501Anna Zaks 2606cc0969ab37c614d6cf496f2ed6d2fca397a0133Anna Zaks if (CalleeCFG->getNumBlockIDs() > AMgr.InlineMaxFunctionSize) 2616cc0969ab37c614d6cf496f2ed6d2fca397a0133Anna Zaks return false; 2626cc0969ab37c614d6cf496f2ed6d2fca397a0133Anna Zaks 26310f77ad7fc5e5cf3f37a9b14ff5843468b8b84d2Ted Kremenek // Do not inline variadic calls (for now). 26410f77ad7fc5e5cf3f37a9b14ff5843468b8b84d2Ted Kremenek if (const BlockDecl *BD = dyn_cast<BlockDecl>(D)) { 26510f77ad7fc5e5cf3f37a9b14ff5843468b8b84d2Ted Kremenek if (BD->isVariadic()) 26610f77ad7fc5e5cf3f37a9b14ff5843468b8b84d2Ted Kremenek return false; 26710f77ad7fc5e5cf3f37a9b14ff5843468b8b84d2Ted Kremenek } 26810f77ad7fc5e5cf3f37a9b14ff5843468b8b84d2Ted Kremenek else if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 26910f77ad7fc5e5cf3f37a9b14ff5843468b8b84d2Ted Kremenek if (FD->isVariadic()) 27010f77ad7fc5e5cf3f37a9b14ff5843468b8b84d2Ted Kremenek return false; 2715903a373db3d27794c90b25687e0dd6adb0e497dAnna Zaks } 2725903a373db3d27794c90b25687e0dd6adb0e497dAnna Zaks 273d4aeb8050a1d0fe47c53a73361c8b0b8ac310f46Ted Kremenek // It is possible that the live variables analysis cannot be 274d4aeb8050a1d0fe47c53a73361c8b0b8ac310f46Ted Kremenek // run. If so, bail out. 275d4aeb8050a1d0fe47c53a73361c8b0b8ac310f46Ted Kremenek if (!CalleeADC->getAnalysis<RelaxedLiveVariables>()) 276d4aeb8050a1d0fe47c53a73361c8b0b8ac310f46Ted Kremenek return false; 277d4aeb8050a1d0fe47c53a73361c8b0b8ac310f46Ted Kremenek 27810f77ad7fc5e5cf3f37a9b14ff5843468b8b84d2Ted Kremenek return true; 2795903a373db3d27794c90b25687e0dd6adb0e497dAnna Zaks} 2805903a373db3d27794c90b25687e0dd6adb0e497dAnna Zaks 281e81ce256b62717dd846bd19aecc4115a0dcd4995Anna Zaksbool ExprEngine::inlineCall(const CallEvent &Call, 282256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek ExplodedNode *Pred) { 28310f77ad7fc5e5cf3f37a9b14ff5843468b8b84d2Ted Kremenek if (!getAnalysisManager().shouldInlineCall()) 2845903a373db3d27794c90b25687e0dd6adb0e497dAnna Zaks return false; 2855903a373db3d27794c90b25687e0dd6adb0e497dAnna Zaks 2869dc5167e4017ef4c8b327abb6f72225eec2e0f19Anna Zaks const Decl *D = Call.getRuntimeDefinition(); 2879dc5167e4017ef4c8b327abb6f72225eec2e0f19Anna Zaks if (!D) 288ee158bc29bc12ce544996f7cdfde14aba63acf4dJordan Rose return false; 289ee158bc29bc12ce544996f7cdfde14aba63acf4dJordan Rose 290c36b30c92c78b95fd29fb5d9d6214d737b3bcb02Jordan Rose const LocationContext *CurLC = Pred->getLocationContext(); 291c36b30c92c78b95fd29fb5d9d6214d737b3bcb02Jordan Rose const StackFrameContext *CallerSFC = CurLC->getCurrentStackFrame(); 2927fa9b4f258636d89342eda28f21a986c8ac353b1Ted Kremenek const LocationContext *ParentOfCallee = 0; 29369f87c956b3ac2b80124fd9604af012e1061473aJordan Rose 29469f87c956b3ac2b80124fd9604af012e1061473aJordan Rose switch (Call.getKind()) { 29569f87c956b3ac2b80124fd9604af012e1061473aJordan Rose case CE_Function: 29669f87c956b3ac2b80124fd9604af012e1061473aJordan Rose case CE_CXXMember: 297e54cfc7b9990acffd0a8a4ba381717b4bb9f3011Jordan Rose case CE_CXXMemberOperator: 29869f87c956b3ac2b80124fd9604af012e1061473aJordan Rose // These are always at least possible to inline. 29969f87c956b3ac2b80124fd9604af012e1061473aJordan Rose break; 30070cbf3cc09eb21db1108396d30a414ea66d842ccJordan Rose case CE_CXXConstructor: 301da5fc53d6b024872c4c1d2c8c5da11e08bf116aaJordan Rose case CE_CXXDestructor: { 302da5fc53d6b024872c4c1d2c8c5da11e08bf116aaJordan Rose // Only inline constructors and destructors if we built the CFGs for them 303da5fc53d6b024872c4c1d2c8c5da11e08bf116aaJordan Rose // properly. 304da5fc53d6b024872c4c1d2c8c5da11e08bf116aaJordan Rose const AnalysisDeclContext *ADC = CallerSFC->getAnalysisDeclContext(); 305da5fc53d6b024872c4c1d2c8c5da11e08bf116aaJordan Rose if (!ADC->getCFGBuildOptions().AddImplicitDtors || 306da5fc53d6b024872c4c1d2c8c5da11e08bf116aaJordan Rose !ADC->getCFGBuildOptions().AddInitializers) 307da5fc53d6b024872c4c1d2c8c5da11e08bf116aaJordan Rose return false; 3083a0a9e3e8bbaa45f3ca22b1e20b3beaac0f5861eJordan Rose 3093a0a9e3e8bbaa45f3ca22b1e20b3beaac0f5861eJordan Rose // FIXME: This is a hack. We don't handle temporary destructors 310888c90ac0ef6baf7d47e86cf5cc4715707d223b1Jordan Rose // right now, so we shouldn't inline their constructors. 311888c90ac0ef6baf7d47e86cf5cc4715707d223b1Jordan Rose if (const CXXConstructorCall *Ctor = dyn_cast<CXXConstructorCall>(&Call)) { 312888c90ac0ef6baf7d47e86cf5cc4715707d223b1Jordan Rose const CXXConstructExpr *CtorExpr = Ctor->getOriginExpr(); 313888c90ac0ef6baf7d47e86cf5cc4715707d223b1Jordan Rose if (CtorExpr->getConstructionKind() == CXXConstructExpr::CK_Complete) 3143a0a9e3e8bbaa45f3ca22b1e20b3beaac0f5861eJordan Rose if (const MemRegion *Target = Ctor->getCXXThisVal().getAsRegion()) 3153a0a9e3e8bbaa45f3ca22b1e20b3beaac0f5861eJordan Rose if (!isa<DeclRegion>(Target)) 3163a0a9e3e8bbaa45f3ca22b1e20b3beaac0f5861eJordan Rose return false; 317888c90ac0ef6baf7d47e86cf5cc4715707d223b1Jordan Rose } 318da5fc53d6b024872c4c1d2c8c5da11e08bf116aaJordan Rose break; 319da5fc53d6b024872c4c1d2c8c5da11e08bf116aaJordan Rose } 32070cbf3cc09eb21db1108396d30a414ea66d842ccJordan Rose case CE_CXXAllocator: 32170cbf3cc09eb21db1108396d30a414ea66d842ccJordan Rose // Do not inline allocators until we model deallocators. 32270cbf3cc09eb21db1108396d30a414ea66d842ccJordan Rose // This is unfortunate, but basically necessary for smart pointers and such. 32370cbf3cc09eb21db1108396d30a414ea66d842ccJordan Rose return false; 32469f87c956b3ac2b80124fd9604af012e1061473aJordan Rose case CE_Block: { 32569f87c956b3ac2b80124fd9604af012e1061473aJordan Rose const BlockDataRegion *BR = cast<BlockCall>(Call).getBlockRegion(); 326ee158bc29bc12ce544996f7cdfde14aba63acf4dJordan Rose assert(BR && "If we have the block definition we should have its region"); 32769f87c956b3ac2b80124fd9604af012e1061473aJordan Rose AnalysisDeclContext *BlockCtx = AMgr.getAnalysisDeclContext(D); 3287fa9b4f258636d89342eda28f21a986c8ac353b1Ted Kremenek ParentOfCallee = BlockCtx->getBlockInvocationContext(CallerSFC, 32969f87c956b3ac2b80124fd9604af012e1061473aJordan Rose cast<BlockDecl>(D), 3307fa9b4f258636d89342eda28f21a986c8ac353b1Ted Kremenek BR); 33169f87c956b3ac2b80124fd9604af012e1061473aJordan Rose break; 33269f87c956b3ac2b80124fd9604af012e1061473aJordan Rose } 33369f87c956b3ac2b80124fd9604af012e1061473aJordan Rose case CE_ObjCMessage: 3349dc5167e4017ef4c8b327abb6f72225eec2e0f19Anna Zaks break; 335256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek } 336ee158bc29bc12ce544996f7cdfde14aba63acf4dJordan Rose 337ee158bc29bc12ce544996f7cdfde14aba63acf4dJordan Rose if (!shouldInlineDecl(D, Pred)) 3387fa9b4f258636d89342eda28f21a986c8ac353b1Ted Kremenek return false; 3397fa9b4f258636d89342eda28f21a986c8ac353b1Ted Kremenek 3407fa9b4f258636d89342eda28f21a986c8ac353b1Ted Kremenek if (!ParentOfCallee) 3417fa9b4f258636d89342eda28f21a986c8ac353b1Ted Kremenek ParentOfCallee = CallerSFC; 3427fa9b4f258636d89342eda28f21a986c8ac353b1Ted Kremenek 343852aa0d2c5d2d1faf2d77b5aa3c0848068a342c5Jordan Rose // This may be NULL, but that's fine. 34469f87c956b3ac2b80124fd9604af012e1061473aJordan Rose const Expr *CallE = Call.getOriginExpr(); 34569f87c956b3ac2b80124fd9604af012e1061473aJordan Rose 3467fa9b4f258636d89342eda28f21a986c8ac353b1Ted Kremenek // Construct a new stack frame for the callee. 3477fa9b4f258636d89342eda28f21a986c8ac353b1Ted Kremenek AnalysisDeclContext *CalleeADC = AMgr.getAnalysisDeclContext(D); 3487fa9b4f258636d89342eda28f21a986c8ac353b1Ted Kremenek const StackFrameContext *CalleeSFC = 34969f87c956b3ac2b80124fd9604af012e1061473aJordan Rose CalleeADC->getStackFrame(ParentOfCallee, CallE, 3507fa9b4f258636d89342eda28f21a986c8ac353b1Ted Kremenek currentBuilderContext->getBlock(), 3517fa9b4f258636d89342eda28f21a986c8ac353b1Ted Kremenek currentStmtIdx); 3527fa9b4f258636d89342eda28f21a986c8ac353b1Ted Kremenek 353c36b30c92c78b95fd29fb5d9d6214d737b3bcb02Jordan Rose CallEnter Loc(CallE, CalleeSFC, CurLC); 354e54cfc7b9990acffd0a8a4ba381717b4bb9f3011Jordan Rose 355e54cfc7b9990acffd0a8a4ba381717b4bb9f3011Jordan Rose // Construct a new state which contains the mapping from actual to 356e54cfc7b9990acffd0a8a4ba381717b4bb9f3011Jordan Rose // formal arguments. 357e54cfc7b9990acffd0a8a4ba381717b4bb9f3011Jordan Rose ProgramStateRef State = Pred->getState()->enterStackFrame(Call, CalleeSFC); 358e54cfc7b9990acffd0a8a4ba381717b4bb9f3011Jordan Rose 3597fa9b4f258636d89342eda28f21a986c8ac353b1Ted Kremenek bool isNew; 360e54cfc7b9990acffd0a8a4ba381717b4bb9f3011Jordan Rose if (ExplodedNode *N = G.getNode(Loc, State, false, &isNew)) { 3617fa9b4f258636d89342eda28f21a986c8ac353b1Ted Kremenek N->addPredecessor(Pred, G); 3627fa9b4f258636d89342eda28f21a986c8ac353b1Ted Kremenek if (isNew) 3637fa9b4f258636d89342eda28f21a986c8ac353b1Ted Kremenek Engine.getWorkList()->enqueue(N); 3647fa9b4f258636d89342eda28f21a986c8ac353b1Ted Kremenek } 3657fa9b4f258636d89342eda28f21a986c8ac353b1Ted Kremenek return true; 366256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek} 367256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek 368e81ce256b62717dd846bd19aecc4115a0dcd4995Anna Zaksstatic ProgramStateRef getInlineFailedState(ProgramStateRef State, 36969f87c956b3ac2b80124fd9604af012e1061473aJordan Rose const Stmt *CallE) { 370e81ce256b62717dd846bd19aecc4115a0dcd4995Anna Zaks void *ReplayState = State->get<ReplayWithoutInlining>(); 3715903a373db3d27794c90b25687e0dd6adb0e497dAnna Zaks if (!ReplayState) 3725903a373db3d27794c90b25687e0dd6adb0e497dAnna Zaks return 0; 37328038f33aa2db4833881fea757a1f0daf85ac02bJordan Rose 37428038f33aa2db4833881fea757a1f0daf85ac02bJordan Rose assert(ReplayState == (const void*)CallE && "Backtracked to the wrong call."); 37528038f33aa2db4833881fea757a1f0daf85ac02bJordan Rose (void)CallE; 37628038f33aa2db4833881fea757a1f0daf85ac02bJordan Rose 377e81ce256b62717dd846bd19aecc4115a0dcd4995Anna Zaks return State->remove<ReplayWithoutInlining>(); 37810520d76044e8fff71d414f30c21b449fd104960Ted Kremenek} 37910520d76044e8fff71d414f30c21b449fd104960Ted Kremenek 380294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenekvoid ExprEngine::VisitCallExpr(const CallExpr *CE, ExplodedNode *Pred, 381294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNodeSet &dst) { 382294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // Perform the previsit of the CallExpr. 383294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNodeSet dstPreVisit; 384294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek getCheckerManager().runCheckersForPreStmt(dstPreVisit, Pred, CE, *this); 385500abad7edfcc2409b18dd616cdbc28a094926f5Jordy Rose 38669f87c956b3ac2b80124fd9604af012e1061473aJordan Rose // Get the callee kind. 387fdaa33818cf9bad8d092136e73bd2e489cb821baJordan Rose CallEventKind K = classifyCallExpr(CE); 38869f87c956b3ac2b80124fd9604af012e1061473aJordan Rose 38969f87c956b3ac2b80124fd9604af012e1061473aJordan Rose // Evaluate the function call. We try each of the checkers 390294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // to see if the can evaluate the function call. 391294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNodeSet dstCallEvaluated; 39269f87c956b3ac2b80124fd9604af012e1061473aJordan Rose for (ExplodedNodeSet::iterator I = dstPreVisit.begin(), E = dstPreVisit.end(); 39369f87c956b3ac2b80124fd9604af012e1061473aJordan Rose I != E; ++I) { 39469f87c956b3ac2b80124fd9604af012e1061473aJordan Rose ProgramStateRef State = (*I)->getState(); 39569f87c956b3ac2b80124fd9604af012e1061473aJordan Rose const LocationContext *LCtx = (*I)->getLocationContext(); 39669f87c956b3ac2b80124fd9604af012e1061473aJordan Rose 39769f87c956b3ac2b80124fd9604af012e1061473aJordan Rose // Evaluate the call. 398fdaa33818cf9bad8d092136e73bd2e489cb821baJordan Rose switch (K) { 399fdaa33818cf9bad8d092136e73bd2e489cb821baJordan Rose case CE_Function: 40069f87c956b3ac2b80124fd9604af012e1061473aJordan Rose evalCall(dstCallEvaluated, *I, FunctionCall(CE, State, LCtx)); 401fdaa33818cf9bad8d092136e73bd2e489cb821baJordan Rose break; 402fdaa33818cf9bad8d092136e73bd2e489cb821baJordan Rose case CE_CXXMember: 403fdaa33818cf9bad8d092136e73bd2e489cb821baJordan Rose evalCall(dstCallEvaluated, *I, CXXMemberCall(cast<CXXMemberCallExpr>(CE), 404fdaa33818cf9bad8d092136e73bd2e489cb821baJordan Rose State, LCtx)); 405fdaa33818cf9bad8d092136e73bd2e489cb821baJordan Rose break; 406fdaa33818cf9bad8d092136e73bd2e489cb821baJordan Rose case CE_CXXMemberOperator: 407fdaa33818cf9bad8d092136e73bd2e489cb821baJordan Rose evalCall(dstCallEvaluated, *I, 408fdaa33818cf9bad8d092136e73bd2e489cb821baJordan Rose CXXMemberOperatorCall(cast<CXXOperatorCallExpr>(CE), 409fdaa33818cf9bad8d092136e73bd2e489cb821baJordan Rose State, LCtx)); 410fdaa33818cf9bad8d092136e73bd2e489cb821baJordan Rose break; 411fdaa33818cf9bad8d092136e73bd2e489cb821baJordan Rose case CE_Block: 412fdaa33818cf9bad8d092136e73bd2e489cb821baJordan Rose evalCall(dstCallEvaluated, *I, BlockCall(CE, State, LCtx)); 413fdaa33818cf9bad8d092136e73bd2e489cb821baJordan Rose break; 414fdaa33818cf9bad8d092136e73bd2e489cb821baJordan Rose default: 415fdaa33818cf9bad8d092136e73bd2e489cb821baJordan Rose llvm_unreachable("Non-CallExpr CallEventKind"); 416fdaa33818cf9bad8d092136e73bd2e489cb821baJordan Rose } 41769f87c956b3ac2b80124fd9604af012e1061473aJordan Rose } 41869f87c956b3ac2b80124fd9604af012e1061473aJordan Rose 419294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // Finally, perform the post-condition check of the CallExpr and store 420294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // the created nodes in 'Dst'. 42169f87c956b3ac2b80124fd9604af012e1061473aJordan Rose // Note that if the call was inlined, dstCallEvaluated will be empty. 42269f87c956b3ac2b80124fd9604af012e1061473aJordan Rose // The post-CallExpr check will occur in processCallExit. 423294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek getCheckerManager().runCheckersForPostStmt(dst, dstCallEvaluated, CE, 424294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek *this); 425294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek} 426294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 42769f87c956b3ac2b80124fd9604af012e1061473aJordan Rosevoid ExprEngine::evalCall(ExplodedNodeSet &Dst, ExplodedNode *Pred, 42869f87c956b3ac2b80124fd9604af012e1061473aJordan Rose const SimpleCall &Call) { 42996479da6ad9d921d875e7be29fe1bfa127be8069Jordan Rose // Run any pre-call checks using the generic call interface. 43096479da6ad9d921d875e7be29fe1bfa127be8069Jordan Rose ExplodedNodeSet dstPreVisit; 43196479da6ad9d921d875e7be29fe1bfa127be8069Jordan Rose getCheckerManager().runCheckersForPreCall(dstPreVisit, Pred, Call, *this); 43296479da6ad9d921d875e7be29fe1bfa127be8069Jordan Rose 43396479da6ad9d921d875e7be29fe1bfa127be8069Jordan Rose // Actually evaluate the function call. We try each of the checkers 43496479da6ad9d921d875e7be29fe1bfa127be8069Jordan Rose // to see if the can evaluate the function call, and get a callback at 43596479da6ad9d921d875e7be29fe1bfa127be8069Jordan Rose // defaultEvalCall if all of them fail. 43696479da6ad9d921d875e7be29fe1bfa127be8069Jordan Rose ExplodedNodeSet dstCallEvaluated; 43796479da6ad9d921d875e7be29fe1bfa127be8069Jordan Rose getCheckerManager().runCheckersForEvalCall(dstCallEvaluated, dstPreVisit, 43896479da6ad9d921d875e7be29fe1bfa127be8069Jordan Rose Call, *this); 43996479da6ad9d921d875e7be29fe1bfa127be8069Jordan Rose 44096479da6ad9d921d875e7be29fe1bfa127be8069Jordan Rose // Finally, run any post-call checks. 44196479da6ad9d921d875e7be29fe1bfa127be8069Jordan Rose getCheckerManager().runCheckersForPostCall(Dst, dstCallEvaluated, 44296479da6ad9d921d875e7be29fe1bfa127be8069Jordan Rose Call, *this); 44369f87c956b3ac2b80124fd9604af012e1061473aJordan Rose} 44469f87c956b3ac2b80124fd9604af012e1061473aJordan Rose 445e81ce256b62717dd846bd19aecc4115a0dcd4995Anna ZaksProgramStateRef ExprEngine::bindReturnValue(const CallEvent &Call, 446e81ce256b62717dd846bd19aecc4115a0dcd4995Anna Zaks const LocationContext *LCtx, 447e81ce256b62717dd846bd19aecc4115a0dcd4995Anna Zaks ProgramStateRef State) { 448e81ce256b62717dd846bd19aecc4115a0dcd4995Anna Zaks const Expr *E = Call.getOriginExpr(); 449e81ce256b62717dd846bd19aecc4115a0dcd4995Anna Zaks if (!E) 450e81ce256b62717dd846bd19aecc4115a0dcd4995Anna Zaks return State; 451e81ce256b62717dd846bd19aecc4115a0dcd4995Anna Zaks 452e81ce256b62717dd846bd19aecc4115a0dcd4995Anna Zaks // Some method families have known return values. 453e81ce256b62717dd846bd19aecc4115a0dcd4995Anna Zaks if (const ObjCMethodCall *Msg = dyn_cast<ObjCMethodCall>(&Call)) { 454e81ce256b62717dd846bd19aecc4115a0dcd4995Anna Zaks switch (Msg->getMethodFamily()) { 455e81ce256b62717dd846bd19aecc4115a0dcd4995Anna Zaks default: 456e81ce256b62717dd846bd19aecc4115a0dcd4995Anna Zaks break; 457e81ce256b62717dd846bd19aecc4115a0dcd4995Anna Zaks case OMF_autorelease: 458e81ce256b62717dd846bd19aecc4115a0dcd4995Anna Zaks case OMF_retain: 459e81ce256b62717dd846bd19aecc4115a0dcd4995Anna Zaks case OMF_self: { 460e81ce256b62717dd846bd19aecc4115a0dcd4995Anna Zaks // These methods return their receivers. 461e81ce256b62717dd846bd19aecc4115a0dcd4995Anna Zaks return State->BindExpr(E, LCtx, Msg->getReceiverSVal()); 462e81ce256b62717dd846bd19aecc4115a0dcd4995Anna Zaks } 463e81ce256b62717dd846bd19aecc4115a0dcd4995Anna Zaks } 464e81ce256b62717dd846bd19aecc4115a0dcd4995Anna Zaks } 465e81ce256b62717dd846bd19aecc4115a0dcd4995Anna Zaks 466e81ce256b62717dd846bd19aecc4115a0dcd4995Anna Zaks // Conjure a symbol if the return value is unknown. 467e81ce256b62717dd846bd19aecc4115a0dcd4995Anna Zaks QualType ResultTy = Call.getResultType(); 468e81ce256b62717dd846bd19aecc4115a0dcd4995Anna Zaks SValBuilder &SVB = getSValBuilder(); 469e81ce256b62717dd846bd19aecc4115a0dcd4995Anna Zaks unsigned Count = currentBuilderContext->getCurrentBlockCount(); 470e81ce256b62717dd846bd19aecc4115a0dcd4995Anna Zaks SVal R = SVB.getConjuredSymbolVal(0, E, LCtx, ResultTy, Count); 471e81ce256b62717dd846bd19aecc4115a0dcd4995Anna Zaks return State->BindExpr(E, LCtx, R); 472e81ce256b62717dd846bd19aecc4115a0dcd4995Anna Zaks} 473e81ce256b62717dd846bd19aecc4115a0dcd4995Anna Zaks 474e81ce256b62717dd846bd19aecc4115a0dcd4995Anna Zaksvoid ExprEngine::defaultEvalCall(NodeBuilder &Bldr, ExplodedNode *Pred, 47569f87c956b3ac2b80124fd9604af012e1061473aJordan Rose const CallEvent &Call) { 476e81ce256b62717dd846bd19aecc4115a0dcd4995Anna Zaks ProgramStateRef State = 0; 477e81ce256b62717dd846bd19aecc4115a0dcd4995Anna Zaks const Expr *E = Call.getOriginExpr(); 478e81ce256b62717dd846bd19aecc4115a0dcd4995Anna Zaks 47969f87c956b3ac2b80124fd9604af012e1061473aJordan Rose // Try to inline the call. 48028038f33aa2db4833881fea757a1f0daf85ac02bJordan Rose // The origin expression here is just used as a kind of checksum; 48128038f33aa2db4833881fea757a1f0daf85ac02bJordan Rose // for CallEvents that do not have origin expressions, this should still be 48228038f33aa2db4833881fea757a1f0daf85ac02bJordan Rose // safe. 4839dc5167e4017ef4c8b327abb6f72225eec2e0f19Anna Zaks State = getInlineFailedState(Pred->getState(), E); 4849dc5167e4017ef4c8b327abb6f72225eec2e0f19Anna Zaks if (State == 0 && inlineCall(Call, Pred)) { 4859dc5167e4017ef4c8b327abb6f72225eec2e0f19Anna Zaks // If we inlined the call, the successor has been manually added onto 4869dc5167e4017ef4c8b327abb6f72225eec2e0f19Anna Zaks // the work list and we should not consider it for subsequent call 4879dc5167e4017ef4c8b327abb6f72225eec2e0f19Anna Zaks // handling steps. 4889dc5167e4017ef4c8b327abb6f72225eec2e0f19Anna Zaks Bldr.takeNodes(Pred); 4899dc5167e4017ef4c8b327abb6f72225eec2e0f19Anna Zaks return; 490e81ce256b62717dd846bd19aecc4115a0dcd4995Anna Zaks } 49169f87c956b3ac2b80124fd9604af012e1061473aJordan Rose 49269f87c956b3ac2b80124fd9604af012e1061473aJordan Rose // If we can't inline it, handle the return value and invalidate the regions. 493e81ce256b62717dd846bd19aecc4115a0dcd4995Anna Zaks if (State == 0) 494e81ce256b62717dd846bd19aecc4115a0dcd4995Anna Zaks State = Pred->getState(); 49569f87c956b3ac2b80124fd9604af012e1061473aJordan Rose 49669f87c956b3ac2b80124fd9604af012e1061473aJordan Rose // Invalidate any regions touched by the call. 49769f87c956b3ac2b80124fd9604af012e1061473aJordan Rose unsigned Count = currentBuilderContext->getCurrentBlockCount(); 498e81ce256b62717dd846bd19aecc4115a0dcd4995Anna Zaks State = Call.invalidateRegions(Count, State); 499e81ce256b62717dd846bd19aecc4115a0dcd4995Anna Zaks 500e81ce256b62717dd846bd19aecc4115a0dcd4995Anna Zaks // Construct and bind the return value. 501e81ce256b62717dd846bd19aecc4115a0dcd4995Anna Zaks State = bindReturnValue(Call, Pred->getLocationContext(), State); 50269f87c956b3ac2b80124fd9604af012e1061473aJordan Rose 50369f87c956b3ac2b80124fd9604af012e1061473aJordan Rose // And make the result node. 504e81ce256b62717dd846bd19aecc4115a0dcd4995Anna Zaks Bldr.generateNode(Call.getProgramPoint(), State, Pred); 50569f87c956b3ac2b80124fd9604af012e1061473aJordan Rose} 50669f87c956b3ac2b80124fd9604af012e1061473aJordan Rose 507294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenekvoid ExprEngine::VisitReturnStmt(const ReturnStmt *RS, ExplodedNode *Pred, 508294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNodeSet &Dst) { 509256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek 510256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek ExplodedNodeSet dstPreVisit; 511256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek getCheckerManager().runCheckersForPreStmt(dstPreVisit, Pred, RS, *this); 512256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek 513256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek StmtNodeBuilder B(dstPreVisit, Dst, *currentBuilderContext); 514256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek 515256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek if (RS->getRetValue()) { 516256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek for (ExplodedNodeSet::iterator it = dstPreVisit.begin(), 517256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek ei = dstPreVisit.end(); it != ei; ++it) { 518256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek B.generateNode(RS, *it, (*it)->getState()); 519294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 520294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 521294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek} 522