ExprEngineCallAndReturn.cpp revision 0504a598a5dc8f3f45e79d4f8ea206a926507859
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 14e90d3f847dcce76237078b67db8895eb7a24189eAnna Zaks#define DEBUG_TYPE "ExprEngine" 15e90d3f847dcce76237078b67db8895eb7a24189eAnna Zaks 16d4aeb8050a1d0fe47c53a73361c8b0b8ac310f46Ted Kremenek#include "clang/Analysis/Analyses/LiveVariables.h" 17294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek#include "clang/StaticAnalyzer/Core/CheckerManager.h" 18294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek#include "clang/StaticAnalyzer/Core/PathSensitive/ExprEngine.h" 19f540c54701e3eeb34cb619a3a4eb18f1ac70ef2dJordan Rose#include "clang/StaticAnalyzer/Core/PathSensitive/CallEvent.h" 20294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek#include "clang/AST/DeclCXX.h" 216fe4dfbc9e5a7018763b1d898876d9b2b8ec3425Jordan Rose#include "clang/AST/ParentMap.h" 224a5f724538cbc275370c9504e8169ce92503256cBenjamin Kramer#include "llvm/ADT/SmallSet.h" 23e90d3f847dcce76237078b67db8895eb7a24189eAnna Zaks#include "llvm/ADT/Statistic.h" 244a5f724538cbc275370c9504e8169ce92503256cBenjamin Kramer#include "llvm/Support/SaveAndRestore.h" 25294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 26294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenekusing namespace clang; 27294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenekusing namespace ento; 28294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 29e90d3f847dcce76237078b67db8895eb7a24189eAnna ZaksSTATISTIC(NumOfDynamicDispatchPathSplits, 30e90d3f847dcce76237078b67db8895eb7a24189eAnna Zaks "The # of times we split the path due to imprecise dynamic dispatch info"); 31e90d3f847dcce76237078b67db8895eb7a24189eAnna Zaks 32210f5a28227c90d739298e3e6729e827858fe397Anna ZaksSTATISTIC(NumInlinedCalls, 33210f5a28227c90d739298e3e6729e827858fe397Anna Zaks "The # of times we inlined a call"); 34210f5a28227c90d739298e3e6729e827858fe397Anna Zaks 353070e13dca5bbefa32acb80ce4a7b217a6220983Ted Kremenekvoid ExprEngine::processCallEnter(CallEnter CE, ExplodedNode *Pred) { 363070e13dca5bbefa32acb80ce4a7b217a6220983Ted Kremenek // Get the entry block in the CFG of the callee. 370849ade4bb3e90c2fc0ce01ccd330f76f91da732Ted Kremenek const StackFrameContext *calleeCtx = CE.getCalleeContext(); 380849ade4bb3e90c2fc0ce01ccd330f76f91da732Ted Kremenek const CFG *CalleeCFG = calleeCtx->getCFG(); 393070e13dca5bbefa32acb80ce4a7b217a6220983Ted Kremenek const CFGBlock *Entry = &(CalleeCFG->getEntry()); 403070e13dca5bbefa32acb80ce4a7b217a6220983Ted Kremenek 413070e13dca5bbefa32acb80ce4a7b217a6220983Ted Kremenek // Validate the CFG. 423070e13dca5bbefa32acb80ce4a7b217a6220983Ted Kremenek assert(Entry->empty()); 433070e13dca5bbefa32acb80ce4a7b217a6220983Ted Kremenek assert(Entry->succ_size() == 1); 443070e13dca5bbefa32acb80ce4a7b217a6220983Ted Kremenek 453070e13dca5bbefa32acb80ce4a7b217a6220983Ted Kremenek // Get the solitary sucessor. 463070e13dca5bbefa32acb80ce4a7b217a6220983Ted Kremenek const CFGBlock *Succ = *(Entry->succ_begin()); 473070e13dca5bbefa32acb80ce4a7b217a6220983Ted Kremenek 483070e13dca5bbefa32acb80ce4a7b217a6220983Ted Kremenek // Construct an edge representing the starting location in the callee. 490849ade4bb3e90c2fc0ce01ccd330f76f91da732Ted Kremenek BlockEdge Loc(Entry, Succ, calleeCtx); 503070e13dca5bbefa32acb80ce4a7b217a6220983Ted Kremenek 51e54cfc7b9990acffd0a8a4ba381717b4bb9f3011Jordan Rose ProgramStateRef state = Pred->getState(); 523070e13dca5bbefa32acb80ce4a7b217a6220983Ted Kremenek 533070e13dca5bbefa32acb80ce4a7b217a6220983Ted Kremenek // Construct a new node and add it to the worklist. 543070e13dca5bbefa32acb80ce4a7b217a6220983Ted Kremenek bool isNew; 553070e13dca5bbefa32acb80ce4a7b217a6220983Ted Kremenek ExplodedNode *Node = G.getNode(Loc, state, false, &isNew); 563070e13dca5bbefa32acb80ce4a7b217a6220983Ted Kremenek Node->addPredecessor(Pred, G); 573070e13dca5bbefa32acb80ce4a7b217a6220983Ted Kremenek if (isNew) 583070e13dca5bbefa32acb80ce4a7b217a6220983Ted Kremenek Engine.getWorkList()->enqueue(Node); 59294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek} 60294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 610b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks// Find the last statement on the path to the exploded node and the 620b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks// corresponding Block. 630b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaksstatic std::pair<const Stmt*, 640b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks const CFGBlock*> getLastStmt(const ExplodedNode *Node) { 650b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks const Stmt *S = 0; 660b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks const StackFrameContext *SF = 670b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks Node->getLocation().getLocationContext()->getCurrentStackFrame(); 68888c90ac0ef6baf7d47e86cf5cc4715707d223b1Jordan Rose 69632e5022f68fcae3b68bbc90538a60f3ba20229fJordan Rose // Back up through the ExplodedGraph until we reach a statement node in this 70632e5022f68fcae3b68bbc90538a60f3ba20229fJordan Rose // stack frame. 71256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek while (Node) { 72256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek const ProgramPoint &PP = Node->getLocation(); 73888c90ac0ef6baf7d47e86cf5cc4715707d223b1Jordan Rose 74632e5022f68fcae3b68bbc90538a60f3ba20229fJordan Rose if (PP.getLocationContext()->getCurrentStackFrame() == SF) { 75632e5022f68fcae3b68bbc90538a60f3ba20229fJordan Rose if (const StmtPoint *SP = dyn_cast<StmtPoint>(&PP)) { 76632e5022f68fcae3b68bbc90538a60f3ba20229fJordan Rose S = SP->getStmt(); 77888c90ac0ef6baf7d47e86cf5cc4715707d223b1Jordan Rose break; 78632e5022f68fcae3b68bbc90538a60f3ba20229fJordan Rose } else if (const CallExitEnd *CEE = dyn_cast<CallExitEnd>(&PP)) { 79632e5022f68fcae3b68bbc90538a60f3ba20229fJordan Rose S = CEE->getCalleeContext()->getCallSite(); 80632e5022f68fcae3b68bbc90538a60f3ba20229fJordan Rose if (S) 81632e5022f68fcae3b68bbc90538a60f3ba20229fJordan Rose break; 82632e5022f68fcae3b68bbc90538a60f3ba20229fJordan Rose 83632e5022f68fcae3b68bbc90538a60f3ba20229fJordan Rose // If there is no statement, this is an implicitly-generated call. 84632e5022f68fcae3b68bbc90538a60f3ba20229fJordan Rose // We'll walk backwards over it and then continue the loop to find 85632e5022f68fcae3b68bbc90538a60f3ba20229fJordan Rose // an actual statement. 86632e5022f68fcae3b68bbc90538a60f3ba20229fJordan Rose const CallEnter *CE; 87632e5022f68fcae3b68bbc90538a60f3ba20229fJordan Rose do { 88632e5022f68fcae3b68bbc90538a60f3ba20229fJordan Rose Node = Node->getFirstPred(); 89632e5022f68fcae3b68bbc90538a60f3ba20229fJordan Rose CE = Node->getLocationAs<CallEnter>(); 90632e5022f68fcae3b68bbc90538a60f3ba20229fJordan Rose } while (!CE || CE->getCalleeContext() != CEE->getCalleeContext()); 91632e5022f68fcae3b68bbc90538a60f3ba20229fJordan Rose 92632e5022f68fcae3b68bbc90538a60f3ba20229fJordan Rose // Continue searching the graph. 93632e5022f68fcae3b68bbc90538a60f3ba20229fJordan Rose } 94888c90ac0ef6baf7d47e86cf5cc4715707d223b1Jordan Rose } else if (const CallEnter *CE = dyn_cast<CallEnter>(&PP)) { 95888c90ac0ef6baf7d47e86cf5cc4715707d223b1Jordan Rose // If we reached the CallEnter for this function, it has no statements. 96888c90ac0ef6baf7d47e86cf5cc4715707d223b1Jordan Rose if (CE->getCalleeContext() == SF) 97888c90ac0ef6baf7d47e86cf5cc4715707d223b1Jordan Rose break; 98256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek } 99888c90ac0ef6baf7d47e86cf5cc4715707d223b1Jordan Rose 100888c90ac0ef6baf7d47e86cf5cc4715707d223b1Jordan Rose Node = *Node->pred_begin(); 101256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek } 102888c90ac0ef6baf7d47e86cf5cc4715707d223b1Jordan Rose 103888c90ac0ef6baf7d47e86cf5cc4715707d223b1Jordan Rose const CFGBlock *Blk = 0; 104888c90ac0ef6baf7d47e86cf5cc4715707d223b1Jordan Rose if (S) { 105888c90ac0ef6baf7d47e86cf5cc4715707d223b1Jordan Rose // Now, get the enclosing basic block. 106888c90ac0ef6baf7d47e86cf5cc4715707d223b1Jordan Rose while (Node && Node->pred_size() >=1 ) { 107888c90ac0ef6baf7d47e86cf5cc4715707d223b1Jordan Rose const ProgramPoint &PP = Node->getLocation(); 108888c90ac0ef6baf7d47e86cf5cc4715707d223b1Jordan Rose if (isa<BlockEdge>(PP) && 109888c90ac0ef6baf7d47e86cf5cc4715707d223b1Jordan Rose (PP.getLocationContext()->getCurrentStackFrame() == SF)) { 110888c90ac0ef6baf7d47e86cf5cc4715707d223b1Jordan Rose BlockEdge &EPP = cast<BlockEdge>(PP); 111888c90ac0ef6baf7d47e86cf5cc4715707d223b1Jordan Rose Blk = EPP.getDst(); 112888c90ac0ef6baf7d47e86cf5cc4715707d223b1Jordan Rose break; 113888c90ac0ef6baf7d47e86cf5cc4715707d223b1Jordan Rose } 114888c90ac0ef6baf7d47e86cf5cc4715707d223b1Jordan Rose Node = *Node->pred_begin(); 115888c90ac0ef6baf7d47e86cf5cc4715707d223b1Jordan Rose } 116888c90ac0ef6baf7d47e86cf5cc4715707d223b1Jordan Rose } 117888c90ac0ef6baf7d47e86cf5cc4715707d223b1Jordan Rose 1180b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks return std::pair<const Stmt*, const CFGBlock*>(S, Blk); 119256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek} 120256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek 1210b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks/// The call exit is simulated with a sequence of nodes, which occur between 1220b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks/// CallExitBegin and CallExitEnd. The following operations occur between the 1230b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks/// two program points: 1240b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks/// 1. CallExitBegin (triggers the start of call exit sequence) 1250b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks/// 2. Bind the return value 1260b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks/// 3. Run Remove dead bindings to clean up the dead symbols from the callee. 1270b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks/// 4. CallExitEnd (switch to the caller context) 1280b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks/// 5. PostStmt<CallExpr> 1290b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaksvoid ExprEngine::processCallExit(ExplodedNode *CEBNode) { 1300b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks // Step 1 CEBNode was generated before the call. 1310b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks 1320b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks const StackFrameContext *calleeCtx = 1330b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks CEBNode->getLocationContext()->getCurrentStackFrame(); 1347fa9b4f258636d89342eda28f21a986c8ac353b1Ted Kremenek 1357fa9b4f258636d89342eda28f21a986c8ac353b1Ted Kremenek // The parent context might not be a stack frame, so make sure we 1367fa9b4f258636d89342eda28f21a986c8ac353b1Ted Kremenek // look up the first enclosing stack frame. 1377fa9b4f258636d89342eda28f21a986c8ac353b1Ted Kremenek const StackFrameContext *callerCtx = 1387fa9b4f258636d89342eda28f21a986c8ac353b1Ted Kremenek calleeCtx->getParent()->getCurrentStackFrame(); 1397fa9b4f258636d89342eda28f21a986c8ac353b1Ted Kremenek 140294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek const Stmt *CE = calleeCtx->getCallSite(); 1410b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks ProgramStateRef state = CEBNode->getState(); 1420b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks // Find the last statement in the function and the corresponding basic block. 1430b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks const Stmt *LastSt = 0; 1440b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks const CFGBlock *Blk = 0; 1450b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks llvm::tie(LastSt, Blk) = getLastStmt(CEBNode); 1460b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks 147852aa0d2c5d2d1faf2d77b5aa3c0848068a342c5Jordan Rose // Step 2: generate node with bound return value: CEBNode -> BindedRetNode. 1480b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks 149294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // If the callee returns an expression, bind its value to CallExpr. 150852aa0d2c5d2d1faf2d77b5aa3c0848068a342c5Jordan Rose if (CE) { 151852aa0d2c5d2d1faf2d77b5aa3c0848068a342c5Jordan Rose if (const ReturnStmt *RS = dyn_cast_or_null<ReturnStmt>(LastSt)) { 152852aa0d2c5d2d1faf2d77b5aa3c0848068a342c5Jordan Rose const LocationContext *LCtx = CEBNode->getLocationContext(); 153852aa0d2c5d2d1faf2d77b5aa3c0848068a342c5Jordan Rose SVal V = state->getSVal(RS, LCtx); 15457c033621dacd8720ac9ff65a09025f14f70e22fJordan Rose state = state->BindExpr(CE, callerCtx, V); 155852aa0d2c5d2d1faf2d77b5aa3c0848068a342c5Jordan Rose } 1560b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks 157852aa0d2c5d2d1faf2d77b5aa3c0848068a342c5Jordan Rose // Bind the constructed object value to CXXConstructExpr. 158852aa0d2c5d2d1faf2d77b5aa3c0848068a342c5Jordan Rose if (const CXXConstructExpr *CCE = dyn_cast<CXXConstructExpr>(CE)) { 159852aa0d2c5d2d1faf2d77b5aa3c0848068a342c5Jordan Rose loc::MemRegionVal This = 160852aa0d2c5d2d1faf2d77b5aa3c0848068a342c5Jordan Rose svalBuilder.getCXXThis(CCE->getConstructor()->getParent(), calleeCtx); 161852aa0d2c5d2d1faf2d77b5aa3c0848068a342c5Jordan Rose SVal ThisV = state->getSVal(This); 1620b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks 1630504a598a5dc8f3f45e79d4f8ea206a926507859Jordan Rose // If the constructed object is a prvalue, get its bindings. 1640504a598a5dc8f3f45e79d4f8ea206a926507859Jordan Rose // Note that we have to be careful here because constructors embedded 1650504a598a5dc8f3f45e79d4f8ea206a926507859Jordan Rose // in DeclStmts are not marked as lvalues. 1660504a598a5dc8f3f45e79d4f8ea206a926507859Jordan Rose if (!CCE->isGLValue()) 1670504a598a5dc8f3f45e79d4f8ea206a926507859Jordan Rose if (const MemRegion *MR = ThisV.getAsRegion()) 1680504a598a5dc8f3f45e79d4f8ea206a926507859Jordan Rose if (isa<CXXTempObjectRegion>(MR)) 1690504a598a5dc8f3f45e79d4f8ea206a926507859Jordan Rose ThisV = state->getSVal(cast<Loc>(ThisV)); 1700504a598a5dc8f3f45e79d4f8ea206a926507859Jordan Rose 17157c033621dacd8720ac9ff65a09025f14f70e22fJordan Rose state = state->BindExpr(CCE, callerCtx, ThisV); 172852aa0d2c5d2d1faf2d77b5aa3c0848068a342c5Jordan Rose } 173294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 1740b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks 1754e79fdfe22db1c982e8fdf8397fee426a8c57821Jordan Rose // Generate a CallEvent /before/ cleaning the state, so that we can get the 1764e79fdfe22db1c982e8fdf8397fee426a8c57821Jordan Rose // correct value for 'this' (if necessary). 1774e79fdfe22db1c982e8fdf8397fee426a8c57821Jordan Rose CallEventManager &CEMgr = getStateManager().getCallEventManager(); 1784e79fdfe22db1c982e8fdf8397fee426a8c57821Jordan Rose CallEventRef<> Call = CEMgr.getCaller(calleeCtx, state); 1794e79fdfe22db1c982e8fdf8397fee426a8c57821Jordan Rose 1800b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks // Step 3: BindedRetNode -> CleanedNodes 1810b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks // If we can find a statement and a block in the inlined function, run remove 1820b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks // dead bindings before returning from the call. This is important to ensure 1830b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks // that we report the issues such as leaks in the stack contexts in which 1840b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks // they occurred. 1850b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks ExplodedNodeSet CleanedNodes; 186255d4d4226b24036ceb11228fbb74286e58620f7Ted Kremenek if (LastSt && Blk && AMgr.options.AnalysisPurgeOpt != PurgeNone) { 18748b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose static SimpleProgramPointTag retValBind("ExprEngine : Bind Return Value"); 18848b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose PostStmt Loc(LastSt, calleeCtx, &retValBind); 18948b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose bool isNew; 19048b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose ExplodedNode *BindedRetNode = G.getNode(Loc, state, false, &isNew); 19148b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose BindedRetNode->addPredecessor(CEBNode, G); 19248b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose if (!isNew) 19348b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose return; 19448b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose 1950b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks NodeBuilderContext Ctx(getCoreEngine(), Blk, BindedRetNode); 19666c486f275531df6362b3511fc3af6563561801bTed Kremenek currBldrCtx = &Ctx; 1970b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks // Here, we call the Symbol Reaper with 0 statement and caller location 1980b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks // context, telling it to clean up everything in the callee's context 1990b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks // (and it's children). We use LastStmt as a diagnostic statement, which 2000b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks // which the PreStmtPurge Dead point will be associated. 2010b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks removeDead(BindedRetNode, CleanedNodes, 0, callerCtx, LastSt, 2020b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks ProgramPoint::PostStmtPurgeDeadSymbolsKind); 20366c486f275531df6362b3511fc3af6563561801bTed Kremenek currBldrCtx = 0; 204144e52be486a3906aec90c51b0ac94a30313152eAnna Zaks } else { 205144e52be486a3906aec90c51b0ac94a30313152eAnna Zaks CleanedNodes.Add(CEBNode); 2060b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks } 2070b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks 2080b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks for (ExplodedNodeSet::iterator I = CleanedNodes.begin(), 2090b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks E = CleanedNodes.end(); I != E; ++I) { 2100b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks 2110b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks // Step 4: Generate the CallExit and leave the callee's context. 2120b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks // CleanedNodes -> CEENode 213852aa0d2c5d2d1faf2d77b5aa3c0848068a342c5Jordan Rose CallExitEnd Loc(calleeCtx, callerCtx); 2140b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks bool isNew; 21548b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose ProgramStateRef CEEState = (*I == CEBNode) ? state : (*I)->getState(); 21648b6247804eacc262cc5508e0fbb74ed819fbb6eJordan Rose ExplodedNode *CEENode = G.getNode(Loc, CEEState, false, &isNew); 2170b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks CEENode->addPredecessor(*I, G); 2180b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks if (!isNew) 2190b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks return; 2200b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks 2210b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks // Step 5: Perform the post-condition check of the CallExpr and enqueue the 2220b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks // result onto the work list. 2230b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks // CEENode -> Dst -> WorkList 2240b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks NodeBuilderContext Ctx(Engine, calleeCtx->getCallSiteBlock(), CEENode); 22566c486f275531df6362b3511fc3af6563561801bTed Kremenek SaveAndRestore<const NodeBuilderContext*> NBCSave(currBldrCtx, 2260b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks &Ctx); 22766c486f275531df6362b3511fc3af6563561801bTed Kremenek SaveAndRestore<unsigned> CBISave(currStmtIdx, calleeCtx->getIndex()); 2280b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks 2294e79fdfe22db1c982e8fdf8397fee426a8c57821Jordan Rose CallEventRef<> UpdatedCall = Call.cloneWithState(CEEState); 23057c033621dacd8720ac9ff65a09025f14f70e22fJordan Rose 23157c033621dacd8720ac9ff65a09025f14f70e22fJordan Rose ExplodedNodeSet DstPostCall; 2324e79fdfe22db1c982e8fdf8397fee426a8c57821Jordan Rose getCheckerManager().runCheckersForPostCall(DstPostCall, CEENode, 2334e79fdfe22db1c982e8fdf8397fee426a8c57821Jordan Rose *UpdatedCall, *this, 2344e79fdfe22db1c982e8fdf8397fee426a8c57821Jordan Rose /*WasInlined=*/true); 23557c033621dacd8720ac9ff65a09025f14f70e22fJordan Rose 23657c033621dacd8720ac9ff65a09025f14f70e22fJordan Rose ExplodedNodeSet Dst; 2374e79fdfe22db1c982e8fdf8397fee426a8c57821Jordan Rose if (const ObjCMethodCall *Msg = dyn_cast<ObjCMethodCall>(Call)) { 2384e79fdfe22db1c982e8fdf8397fee426a8c57821Jordan Rose getCheckerManager().runCheckersForPostObjCMessage(Dst, DstPostCall, *Msg, 2394e79fdfe22db1c982e8fdf8397fee426a8c57821Jordan Rose *this, 2404e79fdfe22db1c982e8fdf8397fee426a8c57821Jordan Rose /*WasInlined=*/true); 24157c033621dacd8720ac9ff65a09025f14f70e22fJordan Rose } else if (CE) { 24257c033621dacd8720ac9ff65a09025f14f70e22fJordan Rose getCheckerManager().runCheckersForPostStmt(Dst, DstPostCall, CE, 2434e79fdfe22db1c982e8fdf8397fee426a8c57821Jordan Rose *this, /*WasInlined=*/true); 24457c033621dacd8720ac9ff65a09025f14f70e22fJordan Rose } else { 24557c033621dacd8720ac9ff65a09025f14f70e22fJordan Rose Dst.insert(DstPostCall); 24657c033621dacd8720ac9ff65a09025f14f70e22fJordan Rose } 2470b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks 2480b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks // Enqueue the next element in the block. 2490b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks for (ExplodedNodeSet::iterator PSI = Dst.begin(), PSE = Dst.end(); 2500b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks PSI != PSE; ++PSI) { 2510b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks Engine.getWorkList()->enqueue(*PSI, calleeCtx->getCallSiteBlock(), 2520b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks calleeCtx->getIndex()+1); 2530b3ade86a1c60cf0c7b56aa238aff458eb7f5974Anna Zaks } 254242384ddb0e0b65dd7e9e0ac0cf3c31cf98b06a6Ted Kremenek } 255294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek} 256294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 2574ea9b89ff6dc50d5404eb56cad5e5870bce49ef2Anna Zaksvoid ExprEngine::examineStackFrames(const Decl *D, const LocationContext *LCtx, 2587229d0011766c174beffe6a846d78f448f845b39Anna Zaks bool &IsRecursive, unsigned &StackDepth) { 2597229d0011766c174beffe6a846d78f448f845b39Anna Zaks IsRecursive = false; 2607229d0011766c174beffe6a846d78f448f845b39Anna Zaks StackDepth = 0; 2614ea9b89ff6dc50d5404eb56cad5e5870bce49ef2Anna Zaks 2620849ade4bb3e90c2fc0ce01ccd330f76f91da732Ted Kremenek while (LCtx) { 2637229d0011766c174beffe6a846d78f448f845b39Anna Zaks if (const StackFrameContext *SFC = dyn_cast<StackFrameContext>(LCtx)) { 2644ea9b89ff6dc50d5404eb56cad5e5870bce49ef2Anna Zaks const Decl *DI = SFC->getDecl(); 2654ea9b89ff6dc50d5404eb56cad5e5870bce49ef2Anna Zaks 2664ea9b89ff6dc50d5404eb56cad5e5870bce49ef2Anna Zaks // Mark recursive (and mutually recursive) functions and always count 2674ea9b89ff6dc50d5404eb56cad5e5870bce49ef2Anna Zaks // them when measuring the stack depth. 2684ea9b89ff6dc50d5404eb56cad5e5870bce49ef2Anna Zaks if (DI == D) { 2697229d0011766c174beffe6a846d78f448f845b39Anna Zaks IsRecursive = true; 2704ea9b89ff6dc50d5404eb56cad5e5870bce49ef2Anna Zaks ++StackDepth; 2714ea9b89ff6dc50d5404eb56cad5e5870bce49ef2Anna Zaks LCtx = LCtx->getParent(); 2724ea9b89ff6dc50d5404eb56cad5e5870bce49ef2Anna Zaks continue; 2734ea9b89ff6dc50d5404eb56cad5e5870bce49ef2Anna Zaks } 2744ea9b89ff6dc50d5404eb56cad5e5870bce49ef2Anna Zaks 2754ea9b89ff6dc50d5404eb56cad5e5870bce49ef2Anna Zaks // Do not count the small functions when determining the stack depth. 2764ea9b89ff6dc50d5404eb56cad5e5870bce49ef2Anna Zaks AnalysisDeclContext *CalleeADC = AMgr.getAnalysisDeclContext(DI); 2774ea9b89ff6dc50d5404eb56cad5e5870bce49ef2Anna Zaks const CFG *CalleeCFG = CalleeADC->getCFG(); 2784ea9b89ff6dc50d5404eb56cad5e5870bce49ef2Anna Zaks if (CalleeCFG->getNumBlockIDs() > AMgr.options.getAlwaysInlineSize()) 2794ea9b89ff6dc50d5404eb56cad5e5870bce49ef2Anna Zaks ++StackDepth; 2807229d0011766c174beffe6a846d78f448f845b39Anna Zaks } 2810849ade4bb3e90c2fc0ce01ccd330f76f91da732Ted Kremenek LCtx = LCtx->getParent(); 2820849ade4bb3e90c2fc0ce01ccd330f76f91da732Ted Kremenek } 2834ea9b89ff6dc50d5404eb56cad5e5870bce49ef2Anna Zaks 2840849ade4bb3e90c2fc0ce01ccd330f76f91da732Ted Kremenek} 2850849ade4bb3e90c2fc0ce01ccd330f76f91da732Ted Kremenek 28681fb50e8b120fc95dc0245b4112972d4d7cca3b5Jordan Rosestatic bool IsInStdNamespace(const FunctionDecl *FD) { 28781fb50e8b120fc95dc0245b4112972d4d7cca3b5Jordan Rose const DeclContext *DC = FD->getEnclosingNamespaceContext(); 28881fb50e8b120fc95dc0245b4112972d4d7cca3b5Jordan Rose const NamespaceDecl *ND = dyn_cast<NamespaceDecl>(DC); 28981fb50e8b120fc95dc0245b4112972d4d7cca3b5Jordan Rose if (!ND) 29081fb50e8b120fc95dc0245b4112972d4d7cca3b5Jordan Rose return false; 29181fb50e8b120fc95dc0245b4112972d4d7cca3b5Jordan Rose 29281fb50e8b120fc95dc0245b4112972d4d7cca3b5Jordan Rose while (const DeclContext *Parent = ND->getParent()) { 29381fb50e8b120fc95dc0245b4112972d4d7cca3b5Jordan Rose if (!isa<NamespaceDecl>(Parent)) 29481fb50e8b120fc95dc0245b4112972d4d7cca3b5Jordan Rose break; 29581fb50e8b120fc95dc0245b4112972d4d7cca3b5Jordan Rose ND = cast<NamespaceDecl>(Parent); 29681fb50e8b120fc95dc0245b4112972d4d7cca3b5Jordan Rose } 29781fb50e8b120fc95dc0245b4112972d4d7cca3b5Jordan Rose 29881fb50e8b120fc95dc0245b4112972d4d7cca3b5Jordan Rose return ND->getName() == "std"; 29981fb50e8b120fc95dc0245b4112972d4d7cca3b5Jordan Rose} 30081fb50e8b120fc95dc0245b4112972d4d7cca3b5Jordan Rose 3016cc0969ab37c614d6cf496f2ed6d2fca397a0133Anna Zaks// Determine if we should inline the call. 3027fa9b4f258636d89342eda28f21a986c8ac353b1Ted Kremenekbool ExprEngine::shouldInlineDecl(const Decl *D, ExplodedNode *Pred) { 3037fa9b4f258636d89342eda28f21a986c8ac353b1Ted Kremenek AnalysisDeclContext *CalleeADC = AMgr.getAnalysisDeclContext(D); 3046cc0969ab37c614d6cf496f2ed6d2fca397a0133Anna Zaks const CFG *CalleeCFG = CalleeADC->getCFG(); 3056cc0969ab37c614d6cf496f2ed6d2fca397a0133Anna Zaks 30601561d1039bfdda61edd20eed939011a8632c7c7Ted Kremenek // It is possible that the CFG cannot be constructed. 30701561d1039bfdda61edd20eed939011a8632c7c7Ted Kremenek // Be safe, and check if the CalleeCFG is valid. 30801561d1039bfdda61edd20eed939011a8632c7c7Ted Kremenek if (!CalleeCFG) 30901561d1039bfdda61edd20eed939011a8632c7c7Ted Kremenek return false; 31001561d1039bfdda61edd20eed939011a8632c7c7Ted Kremenek 3117229d0011766c174beffe6a846d78f448f845b39Anna Zaks bool IsRecursive = false; 3127229d0011766c174beffe6a846d78f448f845b39Anna Zaks unsigned StackDepth = 0; 3137229d0011766c174beffe6a846d78f448f845b39Anna Zaks examineStackFrames(D, Pred->getLocationContext(), IsRecursive, StackDepth); 3147229d0011766c174beffe6a846d78f448f845b39Anna Zaks if ((StackDepth >= AMgr.options.InlineMaxStackDepth) && 3157229d0011766c174beffe6a846d78f448f845b39Anna Zaks ((CalleeCFG->getNumBlockIDs() > AMgr.options.getAlwaysInlineSize()) 3167229d0011766c174beffe6a846d78f448f845b39Anna Zaks || IsRecursive)) 3176cc0969ab37c614d6cf496f2ed6d2fca397a0133Anna Zaks return false; 3186cc0969ab37c614d6cf496f2ed6d2fca397a0133Anna Zaks 3197fa9b4f258636d89342eda28f21a986c8ac353b1Ted Kremenek if (Engine.FunctionSummaries->hasReachedMaxBlockCount(D)) 3203bbd8cd831788c506f2980293eb3c7e1b3ca2501Anna Zaks return false; 3213bbd8cd831788c506f2980293eb3c7e1b3ca2501Anna Zaks 322255d4d4226b24036ceb11228fbb74286e58620f7Ted Kremenek if (CalleeCFG->getNumBlockIDs() > AMgr.options.InlineMaxFunctionSize) 3236cc0969ab37c614d6cf496f2ed6d2fca397a0133Anna Zaks return false; 3246cc0969ab37c614d6cf496f2ed6d2fca397a0133Anna Zaks 32510f77ad7fc5e5cf3f37a9b14ff5843468b8b84d2Ted Kremenek // Do not inline variadic calls (for now). 32610f77ad7fc5e5cf3f37a9b14ff5843468b8b84d2Ted Kremenek if (const BlockDecl *BD = dyn_cast<BlockDecl>(D)) { 32710f77ad7fc5e5cf3f37a9b14ff5843468b8b84d2Ted Kremenek if (BD->isVariadic()) 32810f77ad7fc5e5cf3f37a9b14ff5843468b8b84d2Ted Kremenek return false; 32910f77ad7fc5e5cf3f37a9b14ff5843468b8b84d2Ted Kremenek } 33010f77ad7fc5e5cf3f37a9b14ff5843468b8b84d2Ted Kremenek else if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 33110f77ad7fc5e5cf3f37a9b14ff5843468b8b84d2Ted Kremenek if (FD->isVariadic()) 33210f77ad7fc5e5cf3f37a9b14ff5843468b8b84d2Ted Kremenek return false; 3335903a373db3d27794c90b25687e0dd6adb0e497dAnna Zaks } 3345903a373db3d27794c90b25687e0dd6adb0e497dAnna Zaks 33581fb50e8b120fc95dc0245b4112972d4d7cca3b5Jordan Rose if (getContext().getLangOpts().CPlusPlus) { 33681fb50e8b120fc95dc0245b4112972d4d7cca3b5Jordan Rose if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 33781fb50e8b120fc95dc0245b4112972d4d7cca3b5Jordan Rose // Conditionally allow the inlining of template functions. 33881fb50e8b120fc95dc0245b4112972d4d7cca3b5Jordan Rose if (!getAnalysisManager().options.mayInlineTemplateFunctions()) 33981fb50e8b120fc95dc0245b4112972d4d7cca3b5Jordan Rose if (FD->getTemplatedKind() != FunctionDecl::TK_NonTemplate) 34081fb50e8b120fc95dc0245b4112972d4d7cca3b5Jordan Rose return false; 34181fb50e8b120fc95dc0245b4112972d4d7cca3b5Jordan Rose 34281fb50e8b120fc95dc0245b4112972d4d7cca3b5Jordan Rose // Conditionally allow the inlining of C++ standard library functions. 34381fb50e8b120fc95dc0245b4112972d4d7cca3b5Jordan Rose if (!getAnalysisManager().options.mayInlineCXXStandardLibrary()) 34481fb50e8b120fc95dc0245b4112972d4d7cca3b5Jordan Rose if (getContext().getSourceManager().isInSystemHeader(FD->getLocation())) 34581fb50e8b120fc95dc0245b4112972d4d7cca3b5Jordan Rose if (IsInStdNamespace(FD)) 34681fb50e8b120fc95dc0245b4112972d4d7cca3b5Jordan Rose return false; 34781fb50e8b120fc95dc0245b4112972d4d7cca3b5Jordan Rose } 34881fb50e8b120fc95dc0245b4112972d4d7cca3b5Jordan Rose } 34981fb50e8b120fc95dc0245b4112972d4d7cca3b5Jordan Rose 350d4aeb8050a1d0fe47c53a73361c8b0b8ac310f46Ted Kremenek // It is possible that the live variables analysis cannot be 351d4aeb8050a1d0fe47c53a73361c8b0b8ac310f46Ted Kremenek // run. If so, bail out. 352d4aeb8050a1d0fe47c53a73361c8b0b8ac310f46Ted Kremenek if (!CalleeADC->getAnalysis<RelaxedLiveVariables>()) 353d4aeb8050a1d0fe47c53a73361c8b0b8ac310f46Ted Kremenek return false; 354d4aeb8050a1d0fe47c53a73361c8b0b8ac310f46Ted Kremenek 35510f77ad7fc5e5cf3f37a9b14ff5843468b8b84d2Ted Kremenek return true; 3565903a373db3d27794c90b25687e0dd6adb0e497dAnna Zaks} 3575903a373db3d27794c90b25687e0dd6adb0e497dAnna Zaks 358e90d3f847dcce76237078b67db8895eb7a24189eAnna Zaks/// The GDM component containing the dynamic dispatch bifurcation info. When 359e90d3f847dcce76237078b67db8895eb7a24189eAnna Zaks/// the exact type of the receiver is not known, we want to explore both paths - 360e90d3f847dcce76237078b67db8895eb7a24189eAnna Zaks/// one on which we do inline it and the other one on which we don't. This is 361e90d3f847dcce76237078b67db8895eb7a24189eAnna Zaks/// done to ensure we do not drop coverage. 362e90d3f847dcce76237078b67db8895eb7a24189eAnna Zaks/// This is the map from the receiver region to a bool, specifying either we 363e90d3f847dcce76237078b67db8895eb7a24189eAnna Zaks/// consider this region's information precise or not along the given path. 364e90d3f847dcce76237078b67db8895eb7a24189eAnna Zaksnamespace clang { 365e90d3f847dcce76237078b67db8895eb7a24189eAnna Zaksnamespace ento { 3666960f6e53b0d9a69a460c99ec199470271ff9603Anna Zaksenum DynamicDispatchMode { DynamicDispatchModeInlined = 1, 3676960f6e53b0d9a69a460c99ec199470271ff9603Anna Zaks DynamicDispatchModeConservative }; 3686960f6e53b0d9a69a460c99ec199470271ff9603Anna Zaks 369e90d3f847dcce76237078b67db8895eb7a24189eAnna Zaksstruct DynamicDispatchBifurcationMap {}; 370e90d3f847dcce76237078b67db8895eb7a24189eAnna Zakstypedef llvm::ImmutableMap<const MemRegion*, 3716960f6e53b0d9a69a460c99ec199470271ff9603Anna Zaks unsigned int> DynamicDispatchBifur; 372e90d3f847dcce76237078b67db8895eb7a24189eAnna Zakstemplate<> struct ProgramStateTrait<DynamicDispatchBifurcationMap> 373e90d3f847dcce76237078b67db8895eb7a24189eAnna Zaks : public ProgramStatePartialTrait<DynamicDispatchBifur> { 374e90d3f847dcce76237078b67db8895eb7a24189eAnna Zaks static void *GDMIndex() { static int index; return &index; } 375e90d3f847dcce76237078b67db8895eb7a24189eAnna Zaks}; 3766960f6e53b0d9a69a460c99ec199470271ff9603Anna Zaks 377e90d3f847dcce76237078b67db8895eb7a24189eAnna Zaks}} 378e90d3f847dcce76237078b67db8895eb7a24189eAnna Zaks 379e90d3f847dcce76237078b67db8895eb7a24189eAnna Zaksbool ExprEngine::inlineCall(const CallEvent &Call, const Decl *D, 380e90d3f847dcce76237078b67db8895eb7a24189eAnna Zaks NodeBuilder &Bldr, ExplodedNode *Pred, 381e90d3f847dcce76237078b67db8895eb7a24189eAnna Zaks ProgramStateRef State) { 382e90d3f847dcce76237078b67db8895eb7a24189eAnna Zaks assert(D); 383ee158bc29bc12ce544996f7cdfde14aba63acf4dJordan Rose 384c36b30c92c78b95fd29fb5d9d6214d737b3bcb02Jordan Rose const LocationContext *CurLC = Pred->getLocationContext(); 385c36b30c92c78b95fd29fb5d9d6214d737b3bcb02Jordan Rose const StackFrameContext *CallerSFC = CurLC->getCurrentStackFrame(); 3867fa9b4f258636d89342eda28f21a986c8ac353b1Ted Kremenek const LocationContext *ParentOfCallee = 0; 38769f87c956b3ac2b80124fd9604af012e1061473aJordan Rose 388de5277fc555551857602bd7a7e5e616274e2d4a6Jordan Rose const AnalyzerOptions &Opts = getAnalysisManager().options; 389de5277fc555551857602bd7a7e5e616274e2d4a6Jordan Rose 390ef15831780b705475e7b237ac16418e9b53cb7a6Jordan Rose // FIXME: Refactor this check into a hypothetical CallEvent::canInline. 39169f87c956b3ac2b80124fd9604af012e1061473aJordan Rose switch (Call.getKind()) { 39269f87c956b3ac2b80124fd9604af012e1061473aJordan Rose case CE_Function: 3932f9c40a915593849f6b0f5c4de516e2f597d0d66Jordan Rose break; 39469f87c956b3ac2b80124fd9604af012e1061473aJordan Rose case CE_CXXMember: 395e54cfc7b9990acffd0a8a4ba381717b4bb9f3011Jordan Rose case CE_CXXMemberOperator: 396de5277fc555551857602bd7a7e5e616274e2d4a6Jordan Rose if (!Opts.mayInlineCXXMemberFunction(CIMK_MemberFunctions)) 3972f9c40a915593849f6b0f5c4de516e2f597d0d66Jordan Rose return false; 39869f87c956b3ac2b80124fd9604af012e1061473aJordan Rose break; 399ef15831780b705475e7b237ac16418e9b53cb7a6Jordan Rose case CE_CXXConstructor: { 400de5277fc555551857602bd7a7e5e616274e2d4a6Jordan Rose if (!Opts.mayInlineCXXMemberFunction(CIMK_Constructors)) 4012f9c40a915593849f6b0f5c4de516e2f597d0d66Jordan Rose return false; 4022f9c40a915593849f6b0f5c4de516e2f597d0d66Jordan Rose 403ef15831780b705475e7b237ac16418e9b53cb7a6Jordan Rose const CXXConstructorCall &Ctor = cast<CXXConstructorCall>(Call); 404ef15831780b705475e7b237ac16418e9b53cb7a6Jordan Rose 405e460c46c5d602f65354cab0879c458890273591cJordan Rose // FIXME: We don't handle constructors or destructors for arrays properly. 406ef15831780b705475e7b237ac16418e9b53cb7a6Jordan Rose const MemRegion *Target = Ctor.getCXXThisVal().getAsRegion(); 407e460c46c5d602f65354cab0879c458890273591cJordan Rose if (Target && isa<ElementRegion>(Target)) 408e460c46c5d602f65354cab0879c458890273591cJordan Rose return false; 409e460c46c5d602f65354cab0879c458890273591cJordan Rose 4106fe4dfbc9e5a7018763b1d898876d9b2b8ec3425Jordan Rose // FIXME: This is a hack. We don't use the correct region for a new 4116fe4dfbc9e5a7018763b1d898876d9b2b8ec3425Jordan Rose // expression, so if we inline the constructor its result will just be 4126fe4dfbc9e5a7018763b1d898876d9b2b8ec3425Jordan Rose // thrown away. This short-term hack is tracked in <rdar://problem/12180598> 4136fe4dfbc9e5a7018763b1d898876d9b2b8ec3425Jordan Rose // and the longer-term possible fix is discussed in PR12014. 4146fe4dfbc9e5a7018763b1d898876d9b2b8ec3425Jordan Rose const CXXConstructExpr *CtorExpr = Ctor.getOriginExpr(); 4156fe4dfbc9e5a7018763b1d898876d9b2b8ec3425Jordan Rose if (const Stmt *Parent = CurLC->getParentMap().getParent(CtorExpr)) 4166fe4dfbc9e5a7018763b1d898876d9b2b8ec3425Jordan Rose if (isa<CXXNewExpr>(Parent)) 4176fe4dfbc9e5a7018763b1d898876d9b2b8ec3425Jordan Rose return false; 4186fe4dfbc9e5a7018763b1d898876d9b2b8ec3425Jordan Rose 419de5277fc555551857602bd7a7e5e616274e2d4a6Jordan Rose // Inlining constructors requires including initializers in the CFG. 420de5277fc555551857602bd7a7e5e616274e2d4a6Jordan Rose const AnalysisDeclContext *ADC = CallerSFC->getAnalysisDeclContext(); 421de5277fc555551857602bd7a7e5e616274e2d4a6Jordan Rose assert(ADC->getCFGBuildOptions().AddInitializers && "No CFG initializers"); 4229eb214a691663a04ee61197e7d605128c85e09f7Jordan Rose (void)ADC; 423de5277fc555551857602bd7a7e5e616274e2d4a6Jordan Rose 424c210cb7a358d14cdd93b58562f33ff5ed2d895c1Jordan Rose // If the destructor is trivial, it's always safe to inline the constructor. 425c210cb7a358d14cdd93b58562f33ff5ed2d895c1Jordan Rose if (Ctor.getDecl()->getParent()->hasTrivialDestructor()) 426c210cb7a358d14cdd93b58562f33ff5ed2d895c1Jordan Rose break; 427c210cb7a358d14cdd93b58562f33ff5ed2d895c1Jordan Rose 428de5277fc555551857602bd7a7e5e616274e2d4a6Jordan Rose // For other types, only inline constructors if destructor inlining is 429de5277fc555551857602bd7a7e5e616274e2d4a6Jordan Rose // also enabled. 430de5277fc555551857602bd7a7e5e616274e2d4a6Jordan Rose if (!Opts.mayInlineCXXMemberFunction(CIMK_Destructors)) 431c210cb7a358d14cdd93b58562f33ff5ed2d895c1Jordan Rose return false; 432c210cb7a358d14cdd93b58562f33ff5ed2d895c1Jordan Rose 4333a0a9e3e8bbaa45f3ca22b1e20b3beaac0f5861eJordan Rose // FIXME: This is a hack. We don't handle temporary destructors 434888c90ac0ef6baf7d47e86cf5cc4715707d223b1Jordan Rose // right now, so we shouldn't inline their constructors. 435ef15831780b705475e7b237ac16418e9b53cb7a6Jordan Rose if (CtorExpr->getConstructionKind() == CXXConstructExpr::CK_Complete) 436ef15831780b705475e7b237ac16418e9b53cb7a6Jordan Rose if (!Target || !isa<DeclRegion>(Target)) 437ef15831780b705475e7b237ac16418e9b53cb7a6Jordan Rose return false; 438ef15831780b705475e7b237ac16418e9b53cb7a6Jordan Rose 439ef15831780b705475e7b237ac16418e9b53cb7a6Jordan Rose break; 440ef15831780b705475e7b237ac16418e9b53cb7a6Jordan Rose } 441ef15831780b705475e7b237ac16418e9b53cb7a6Jordan Rose case CE_CXXDestructor: { 442de5277fc555551857602bd7a7e5e616274e2d4a6Jordan Rose if (!Opts.mayInlineCXXMemberFunction(CIMK_Destructors)) 4432f9c40a915593849f6b0f5c4de516e2f597d0d66Jordan Rose return false; 4442f9c40a915593849f6b0f5c4de516e2f597d0d66Jordan Rose 445de5277fc555551857602bd7a7e5e616274e2d4a6Jordan Rose // Inlining destructors requires building the CFG correctly. 446ef15831780b705475e7b237ac16418e9b53cb7a6Jordan Rose const AnalysisDeclContext *ADC = CallerSFC->getAnalysisDeclContext(); 447de5277fc555551857602bd7a7e5e616274e2d4a6Jordan Rose assert(ADC->getCFGBuildOptions().AddImplicitDtors && "No CFG destructors"); 4489eb214a691663a04ee61197e7d605128c85e09f7Jordan Rose (void)ADC; 449ef15831780b705475e7b237ac16418e9b53cb7a6Jordan Rose 450ef15831780b705475e7b237ac16418e9b53cb7a6Jordan Rose const CXXDestructorCall &Dtor = cast<CXXDestructorCall>(Call); 451ef15831780b705475e7b237ac16418e9b53cb7a6Jordan Rose 452ef15831780b705475e7b237ac16418e9b53cb7a6Jordan Rose // FIXME: We don't handle constructors or destructors for arrays properly. 453ef15831780b705475e7b237ac16418e9b53cb7a6Jordan Rose const MemRegion *Target = Dtor.getCXXThisVal().getAsRegion(); 454ef15831780b705475e7b237ac16418e9b53cb7a6Jordan Rose if (Target && isa<ElementRegion>(Target)) 455ef15831780b705475e7b237ac16418e9b53cb7a6Jordan Rose return false; 456ef15831780b705475e7b237ac16418e9b53cb7a6Jordan Rose 457da5fc53d6b024872c4c1d2c8c5da11e08bf116aaJordan Rose break; 458da5fc53d6b024872c4c1d2c8c5da11e08bf116aaJordan Rose } 45970cbf3cc09eb21db1108396d30a414ea66d842ccJordan Rose case CE_CXXAllocator: 46070cbf3cc09eb21db1108396d30a414ea66d842ccJordan Rose // Do not inline allocators until we model deallocators. 46170cbf3cc09eb21db1108396d30a414ea66d842ccJordan Rose // This is unfortunate, but basically necessary for smart pointers and such. 46270cbf3cc09eb21db1108396d30a414ea66d842ccJordan Rose return false; 46369f87c956b3ac2b80124fd9604af012e1061473aJordan Rose case CE_Block: { 46469f87c956b3ac2b80124fd9604af012e1061473aJordan Rose const BlockDataRegion *BR = cast<BlockCall>(Call).getBlockRegion(); 465ee158bc29bc12ce544996f7cdfde14aba63acf4dJordan Rose assert(BR && "If we have the block definition we should have its region"); 46669f87c956b3ac2b80124fd9604af012e1061473aJordan Rose AnalysisDeclContext *BlockCtx = AMgr.getAnalysisDeclContext(D); 4677fa9b4f258636d89342eda28f21a986c8ac353b1Ted Kremenek ParentOfCallee = BlockCtx->getBlockInvocationContext(CallerSFC, 46869f87c956b3ac2b80124fd9604af012e1061473aJordan Rose cast<BlockDecl>(D), 4697fa9b4f258636d89342eda28f21a986c8ac353b1Ted Kremenek BR); 47069f87c956b3ac2b80124fd9604af012e1061473aJordan Rose break; 47169f87c956b3ac2b80124fd9604af012e1061473aJordan Rose } 47269f87c956b3ac2b80124fd9604af012e1061473aJordan Rose case CE_ObjCMessage: 47357330eed3fbe530cb05996e4a346cc5fc217c0d9Anna Zaks if (!Opts.mayInlineObjCMethod()) 47457330eed3fbe530cb05996e4a346cc5fc217c0d9Anna Zaks return false; 475255d4d4226b24036ceb11228fbb74286e58620f7Ted Kremenek if (!(getAnalysisManager().options.IPAMode == DynamicDispatch || 476255d4d4226b24036ceb11228fbb74286e58620f7Ted Kremenek getAnalysisManager().options.IPAMode == DynamicDispatchBifurcate)) 477e13056a8bb532ddfdc07952a13169aa422bacd3bAnna Zaks return false; 4789dc5167e4017ef4c8b327abb6f72225eec2e0f19Anna Zaks break; 479256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek } 480ee158bc29bc12ce544996f7cdfde14aba63acf4dJordan Rose 481ee158bc29bc12ce544996f7cdfde14aba63acf4dJordan Rose if (!shouldInlineDecl(D, Pred)) 4827fa9b4f258636d89342eda28f21a986c8ac353b1Ted Kremenek return false; 4837fa9b4f258636d89342eda28f21a986c8ac353b1Ted Kremenek 4847fa9b4f258636d89342eda28f21a986c8ac353b1Ted Kremenek if (!ParentOfCallee) 4857fa9b4f258636d89342eda28f21a986c8ac353b1Ted Kremenek ParentOfCallee = CallerSFC; 4867fa9b4f258636d89342eda28f21a986c8ac353b1Ted Kremenek 487852aa0d2c5d2d1faf2d77b5aa3c0848068a342c5Jordan Rose // This may be NULL, but that's fine. 48869f87c956b3ac2b80124fd9604af012e1061473aJordan Rose const Expr *CallE = Call.getOriginExpr(); 48969f87c956b3ac2b80124fd9604af012e1061473aJordan Rose 4907fa9b4f258636d89342eda28f21a986c8ac353b1Ted Kremenek // Construct a new stack frame for the callee. 4917fa9b4f258636d89342eda28f21a986c8ac353b1Ted Kremenek AnalysisDeclContext *CalleeADC = AMgr.getAnalysisDeclContext(D); 4927fa9b4f258636d89342eda28f21a986c8ac353b1Ted Kremenek const StackFrameContext *CalleeSFC = 49369f87c956b3ac2b80124fd9604af012e1061473aJordan Rose CalleeADC->getStackFrame(ParentOfCallee, CallE, 49466c486f275531df6362b3511fc3af6563561801bTed Kremenek currBldrCtx->getBlock(), 49566c486f275531df6362b3511fc3af6563561801bTed Kremenek currStmtIdx); 4967fa9b4f258636d89342eda28f21a986c8ac353b1Ted Kremenek 497c36b30c92c78b95fd29fb5d9d6214d737b3bcb02Jordan Rose CallEnter Loc(CallE, CalleeSFC, CurLC); 498e54cfc7b9990acffd0a8a4ba381717b4bb9f3011Jordan Rose 499e54cfc7b9990acffd0a8a4ba381717b4bb9f3011Jordan Rose // Construct a new state which contains the mapping from actual to 500e54cfc7b9990acffd0a8a4ba381717b4bb9f3011Jordan Rose // formal arguments. 501e90d3f847dcce76237078b67db8895eb7a24189eAnna Zaks State = State->enterStackFrame(Call, CalleeSFC); 502e54cfc7b9990acffd0a8a4ba381717b4bb9f3011Jordan Rose 5037fa9b4f258636d89342eda28f21a986c8ac353b1Ted Kremenek bool isNew; 504e54cfc7b9990acffd0a8a4ba381717b4bb9f3011Jordan Rose if (ExplodedNode *N = G.getNode(Loc, State, false, &isNew)) { 5057fa9b4f258636d89342eda28f21a986c8ac353b1Ted Kremenek N->addPredecessor(Pred, G); 5067fa9b4f258636d89342eda28f21a986c8ac353b1Ted Kremenek if (isNew) 5077fa9b4f258636d89342eda28f21a986c8ac353b1Ted Kremenek Engine.getWorkList()->enqueue(N); 5087fa9b4f258636d89342eda28f21a986c8ac353b1Ted Kremenek } 509e90d3f847dcce76237078b67db8895eb7a24189eAnna Zaks 510e90d3f847dcce76237078b67db8895eb7a24189eAnna Zaks // If we decided to inline the call, the successor has been manually 511e90d3f847dcce76237078b67db8895eb7a24189eAnna Zaks // added onto the work list so remove it from the node builder. 512e90d3f847dcce76237078b67db8895eb7a24189eAnna Zaks Bldr.takeNodes(Pred); 513e90d3f847dcce76237078b67db8895eb7a24189eAnna Zaks 514210f5a28227c90d739298e3e6729e827858fe397Anna Zaks NumInlinedCalls++; 515210f5a28227c90d739298e3e6729e827858fe397Anna Zaks 516fbcb3f11fc90e9f00e6074e9b118b8dc11ca604cAnna Zaks // Mark the decl as visited. 517fbcb3f11fc90e9f00e6074e9b118b8dc11ca604cAnna Zaks if (VisitedCallees) 518fbcb3f11fc90e9f00e6074e9b118b8dc11ca604cAnna Zaks VisitedCallees->insert(D); 519fbcb3f11fc90e9f00e6074e9b118b8dc11ca604cAnna Zaks 5207fa9b4f258636d89342eda28f21a986c8ac353b1Ted Kremenek return true; 521256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek} 522256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek 523e81ce256b62717dd846bd19aecc4115a0dcd4995Anna Zaksstatic ProgramStateRef getInlineFailedState(ProgramStateRef State, 52469f87c956b3ac2b80124fd9604af012e1061473aJordan Rose const Stmt *CallE) { 525e81ce256b62717dd846bd19aecc4115a0dcd4995Anna Zaks void *ReplayState = State->get<ReplayWithoutInlining>(); 5265903a373db3d27794c90b25687e0dd6adb0e497dAnna Zaks if (!ReplayState) 5275903a373db3d27794c90b25687e0dd6adb0e497dAnna Zaks return 0; 52828038f33aa2db4833881fea757a1f0daf85ac02bJordan Rose 52928038f33aa2db4833881fea757a1f0daf85ac02bJordan Rose assert(ReplayState == (const void*)CallE && "Backtracked to the wrong call."); 53028038f33aa2db4833881fea757a1f0daf85ac02bJordan Rose (void)CallE; 53128038f33aa2db4833881fea757a1f0daf85ac02bJordan Rose 532e81ce256b62717dd846bd19aecc4115a0dcd4995Anna Zaks return State->remove<ReplayWithoutInlining>(); 53310520d76044e8fff71d414f30c21b449fd104960Ted Kremenek} 53410520d76044e8fff71d414f30c21b449fd104960Ted Kremenek 535294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenekvoid ExprEngine::VisitCallExpr(const CallExpr *CE, ExplodedNode *Pred, 536294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNodeSet &dst) { 537294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // Perform the previsit of the CallExpr. 538294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNodeSet dstPreVisit; 539294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek getCheckerManager().runCheckersForPreStmt(dstPreVisit, Pred, CE, *this); 540500abad7edfcc2409b18dd616cdbc28a094926f5Jordy Rose 541d563d3fb73879df7147b8a5302c3bf0e1402ba18Jordan Rose // Get the call in its initial state. We use this as a template to perform 542d563d3fb73879df7147b8a5302c3bf0e1402ba18Jordan Rose // all the checks. 543d563d3fb73879df7147b8a5302c3bf0e1402ba18Jordan Rose CallEventManager &CEMgr = getStateManager().getCallEventManager(); 544645baeed6800f952e9ad1d5666e01080385531a2Jordan Rose CallEventRef<> CallTemplate 545d563d3fb73879df7147b8a5302c3bf0e1402ba18Jordan Rose = CEMgr.getSimpleCall(CE, Pred->getState(), Pred->getLocationContext()); 54669f87c956b3ac2b80124fd9604af012e1061473aJordan Rose 54769f87c956b3ac2b80124fd9604af012e1061473aJordan Rose // Evaluate the function call. We try each of the checkers 548294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // to see if the can evaluate the function call. 549294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNodeSet dstCallEvaluated; 55069f87c956b3ac2b80124fd9604af012e1061473aJordan Rose for (ExplodedNodeSet::iterator I = dstPreVisit.begin(), E = dstPreVisit.end(); 55169f87c956b3ac2b80124fd9604af012e1061473aJordan Rose I != E; ++I) { 552d563d3fb73879df7147b8a5302c3bf0e1402ba18Jordan Rose evalCall(dstCallEvaluated, *I, *CallTemplate); 55369f87c956b3ac2b80124fd9604af012e1061473aJordan Rose } 55469f87c956b3ac2b80124fd9604af012e1061473aJordan Rose 555294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // Finally, perform the post-condition check of the CallExpr and store 556294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // the created nodes in 'Dst'. 55769f87c956b3ac2b80124fd9604af012e1061473aJordan Rose // Note that if the call was inlined, dstCallEvaluated will be empty. 55869f87c956b3ac2b80124fd9604af012e1061473aJordan Rose // The post-CallExpr check will occur in processCallExit. 559294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek getCheckerManager().runCheckersForPostStmt(dst, dstCallEvaluated, CE, 560294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek *this); 561294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek} 562294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 56369f87c956b3ac2b80124fd9604af012e1061473aJordan Rosevoid ExprEngine::evalCall(ExplodedNodeSet &Dst, ExplodedNode *Pred, 564645baeed6800f952e9ad1d5666e01080385531a2Jordan Rose const CallEvent &Call) { 565d563d3fb73879df7147b8a5302c3bf0e1402ba18Jordan Rose // WARNING: At this time, the state attached to 'Call' may be older than the 566d563d3fb73879df7147b8a5302c3bf0e1402ba18Jordan Rose // state in 'Pred'. This is a minor optimization since CheckerManager will 567d563d3fb73879df7147b8a5302c3bf0e1402ba18Jordan Rose // use an updated CallEvent instance when calling checkers, but if 'Call' is 568d563d3fb73879df7147b8a5302c3bf0e1402ba18Jordan Rose // ever used directly in this function all callers should be updated to pass 569d563d3fb73879df7147b8a5302c3bf0e1402ba18Jordan Rose // the most recent state. (It is probably not worth doing the work here since 570d563d3fb73879df7147b8a5302c3bf0e1402ba18Jordan Rose // for some callers this will not be necessary.) 571d563d3fb73879df7147b8a5302c3bf0e1402ba18Jordan Rose 57296479da6ad9d921d875e7be29fe1bfa127be8069Jordan Rose // Run any pre-call checks using the generic call interface. 57396479da6ad9d921d875e7be29fe1bfa127be8069Jordan Rose ExplodedNodeSet dstPreVisit; 57496479da6ad9d921d875e7be29fe1bfa127be8069Jordan Rose getCheckerManager().runCheckersForPreCall(dstPreVisit, Pred, Call, *this); 57596479da6ad9d921d875e7be29fe1bfa127be8069Jordan Rose 57696479da6ad9d921d875e7be29fe1bfa127be8069Jordan Rose // Actually evaluate the function call. We try each of the checkers 57796479da6ad9d921d875e7be29fe1bfa127be8069Jordan Rose // to see if the can evaluate the function call, and get a callback at 57896479da6ad9d921d875e7be29fe1bfa127be8069Jordan Rose // defaultEvalCall if all of them fail. 57996479da6ad9d921d875e7be29fe1bfa127be8069Jordan Rose ExplodedNodeSet dstCallEvaluated; 58096479da6ad9d921d875e7be29fe1bfa127be8069Jordan Rose getCheckerManager().runCheckersForEvalCall(dstCallEvaluated, dstPreVisit, 58196479da6ad9d921d875e7be29fe1bfa127be8069Jordan Rose Call, *this); 58296479da6ad9d921d875e7be29fe1bfa127be8069Jordan Rose 58396479da6ad9d921d875e7be29fe1bfa127be8069Jordan Rose // Finally, run any post-call checks. 58496479da6ad9d921d875e7be29fe1bfa127be8069Jordan Rose getCheckerManager().runCheckersForPostCall(Dst, dstCallEvaluated, 58596479da6ad9d921d875e7be29fe1bfa127be8069Jordan Rose Call, *this); 58669f87c956b3ac2b80124fd9604af012e1061473aJordan Rose} 58769f87c956b3ac2b80124fd9604af012e1061473aJordan Rose 588e81ce256b62717dd846bd19aecc4115a0dcd4995Anna ZaksProgramStateRef ExprEngine::bindReturnValue(const CallEvent &Call, 589e81ce256b62717dd846bd19aecc4115a0dcd4995Anna Zaks const LocationContext *LCtx, 590e81ce256b62717dd846bd19aecc4115a0dcd4995Anna Zaks ProgramStateRef State) { 591e81ce256b62717dd846bd19aecc4115a0dcd4995Anna Zaks const Expr *E = Call.getOriginExpr(); 592e81ce256b62717dd846bd19aecc4115a0dcd4995Anna Zaks if (!E) 593e81ce256b62717dd846bd19aecc4115a0dcd4995Anna Zaks return State; 594e81ce256b62717dd846bd19aecc4115a0dcd4995Anna Zaks 595e81ce256b62717dd846bd19aecc4115a0dcd4995Anna Zaks // Some method families have known return values. 596e81ce256b62717dd846bd19aecc4115a0dcd4995Anna Zaks if (const ObjCMethodCall *Msg = dyn_cast<ObjCMethodCall>(&Call)) { 597e81ce256b62717dd846bd19aecc4115a0dcd4995Anna Zaks switch (Msg->getMethodFamily()) { 598e81ce256b62717dd846bd19aecc4115a0dcd4995Anna Zaks default: 599e81ce256b62717dd846bd19aecc4115a0dcd4995Anna Zaks break; 600e81ce256b62717dd846bd19aecc4115a0dcd4995Anna Zaks case OMF_autorelease: 601e81ce256b62717dd846bd19aecc4115a0dcd4995Anna Zaks case OMF_retain: 602e81ce256b62717dd846bd19aecc4115a0dcd4995Anna Zaks case OMF_self: { 603e81ce256b62717dd846bd19aecc4115a0dcd4995Anna Zaks // These methods return their receivers. 604e81ce256b62717dd846bd19aecc4115a0dcd4995Anna Zaks return State->BindExpr(E, LCtx, Msg->getReceiverSVal()); 605e81ce256b62717dd846bd19aecc4115a0dcd4995Anna Zaks } 606e81ce256b62717dd846bd19aecc4115a0dcd4995Anna Zaks } 607e460c46c5d602f65354cab0879c458890273591cJordan Rose } else if (const CXXConstructorCall *C = dyn_cast<CXXConstructorCall>(&Call)){ 608e460c46c5d602f65354cab0879c458890273591cJordan Rose return State->BindExpr(E, LCtx, C->getCXXThisVal()); 609e81ce256b62717dd846bd19aecc4115a0dcd4995Anna Zaks } 610e81ce256b62717dd846bd19aecc4115a0dcd4995Anna Zaks 611e81ce256b62717dd846bd19aecc4115a0dcd4995Anna Zaks // Conjure a symbol if the return value is unknown. 612e81ce256b62717dd846bd19aecc4115a0dcd4995Anna Zaks QualType ResultTy = Call.getResultType(); 613e81ce256b62717dd846bd19aecc4115a0dcd4995Anna Zaks SValBuilder &SVB = getSValBuilder(); 61466c486f275531df6362b3511fc3af6563561801bTed Kremenek unsigned Count = currBldrCtx->blockCount(); 6153b1df8bb941a18c4a7256d7cfcbccb9de7e39995Ted Kremenek SVal R = SVB.conjureSymbolVal(0, E, LCtx, ResultTy, Count); 616e81ce256b62717dd846bd19aecc4115a0dcd4995Anna Zaks return State->BindExpr(E, LCtx, R); 617e81ce256b62717dd846bd19aecc4115a0dcd4995Anna Zaks} 618e81ce256b62717dd846bd19aecc4115a0dcd4995Anna Zaks 619e90d3f847dcce76237078b67db8895eb7a24189eAnna Zaks// Conservatively evaluate call by invalidating regions and binding 620e90d3f847dcce76237078b67db8895eb7a24189eAnna Zaks// a conjured return value. 621e90d3f847dcce76237078b67db8895eb7a24189eAnna Zaksvoid ExprEngine::conservativeEvalCall(const CallEvent &Call, NodeBuilder &Bldr, 622e90d3f847dcce76237078b67db8895eb7a24189eAnna Zaks ExplodedNode *Pred, ProgramStateRef State) { 62366c486f275531df6362b3511fc3af6563561801bTed Kremenek State = Call.invalidateRegions(currBldrCtx->blockCount(), State); 624e90d3f847dcce76237078b67db8895eb7a24189eAnna Zaks State = bindReturnValue(Call, Pred->getLocationContext(), State); 625e90d3f847dcce76237078b67db8895eb7a24189eAnna Zaks 626e90d3f847dcce76237078b67db8895eb7a24189eAnna Zaks // And make the result node. 627e90d3f847dcce76237078b67db8895eb7a24189eAnna Zaks Bldr.generateNode(Call.getProgramPoint(), State, Pred); 628e90d3f847dcce76237078b67db8895eb7a24189eAnna Zaks} 629e90d3f847dcce76237078b67db8895eb7a24189eAnna Zaks 630e81ce256b62717dd846bd19aecc4115a0dcd4995Anna Zaksvoid ExprEngine::defaultEvalCall(NodeBuilder &Bldr, ExplodedNode *Pred, 631d563d3fb73879df7147b8a5302c3bf0e1402ba18Jordan Rose const CallEvent &CallTemplate) { 632d563d3fb73879df7147b8a5302c3bf0e1402ba18Jordan Rose // Make sure we have the most recent state attached to the call. 633d563d3fb73879df7147b8a5302c3bf0e1402ba18Jordan Rose ProgramStateRef State = Pred->getState(); 634d563d3fb73879df7147b8a5302c3bf0e1402ba18Jordan Rose CallEventRef<> Call = CallTemplate.cloneWithState(State); 635e81ce256b62717dd846bd19aecc4115a0dcd4995Anna Zaks 6365960f4aeac9760198c80e05d70d8dadb1db0ff0eAnna Zaks if (!getAnalysisManager().shouldInlineCall()) { 6375960f4aeac9760198c80e05d70d8dadb1db0ff0eAnna Zaks conservativeEvalCall(*Call, Bldr, Pred, State); 6385960f4aeac9760198c80e05d70d8dadb1db0ff0eAnna Zaks return; 6395960f4aeac9760198c80e05d70d8dadb1db0ff0eAnna Zaks } 64069f87c956b3ac2b80124fd9604af012e1061473aJordan Rose // Try to inline the call. 64128038f33aa2db4833881fea757a1f0daf85ac02bJordan Rose // The origin expression here is just used as a kind of checksum; 642d563d3fb73879df7147b8a5302c3bf0e1402ba18Jordan Rose // this should still be safe even for CallEvents that don't come from exprs. 643d563d3fb73879df7147b8a5302c3bf0e1402ba18Jordan Rose const Expr *E = Call->getOriginExpr(); 644d563d3fb73879df7147b8a5302c3bf0e1402ba18Jordan Rose ProgramStateRef InlinedFailedState = getInlineFailedState(State, E); 645d563d3fb73879df7147b8a5302c3bf0e1402ba18Jordan Rose 646d563d3fb73879df7147b8a5302c3bf0e1402ba18Jordan Rose if (InlinedFailedState) { 647d563d3fb73879df7147b8a5302c3bf0e1402ba18Jordan Rose // If we already tried once and failed, make sure we don't retry later. 648d563d3fb73879df7147b8a5302c3bf0e1402ba18Jordan Rose State = InlinedFailedState; 6495960f4aeac9760198c80e05d70d8dadb1db0ff0eAnna Zaks } else { 650ddc0c4814788dda4ef224cd4d22d07154a6ede49Ted Kremenek RuntimeDefinition RD = Call->getRuntimeDefinition(); 651fc05decf08feefd2ffe8cc250219aee6eab3119cAnna Zaks const Decl *D = RD.getDecl(); 652e90d3f847dcce76237078b67db8895eb7a24189eAnna Zaks if (D) { 653b763ede873c23c8651bd18eba0c62e929b496ba5Jordan Rose if (RD.mayHaveOtherDefinitions()) { 654b763ede873c23c8651bd18eba0c62e929b496ba5Jordan Rose // Explore with and without inlining the call. 655255d4d4226b24036ceb11228fbb74286e58620f7Ted Kremenek if (getAnalysisManager().options.IPAMode == DynamicDispatchBifurcate) { 656b763ede873c23c8651bd18eba0c62e929b496ba5Jordan Rose BifurcateCall(RD.getDispatchRegion(), *Call, D, Bldr, Pred); 657b763ede873c23c8651bd18eba0c62e929b496ba5Jordan Rose return; 658b763ede873c23c8651bd18eba0c62e929b496ba5Jordan Rose } 659b763ede873c23c8651bd18eba0c62e929b496ba5Jordan Rose 660b763ede873c23c8651bd18eba0c62e929b496ba5Jordan Rose // Don't inline if we're not in any dynamic dispatch mode. 661255d4d4226b24036ceb11228fbb74286e58620f7Ted Kremenek if (getAnalysisManager().options.IPAMode != DynamicDispatch) { 662da29ac527063fc9714547088bf841bfa30557bf0Jordan Rose conservativeEvalCall(*Call, Bldr, Pred, State); 663b763ede873c23c8651bd18eba0c62e929b496ba5Jordan Rose return; 664da29ac527063fc9714547088bf841bfa30557bf0Jordan Rose } 665e90d3f847dcce76237078b67db8895eb7a24189eAnna Zaks } 666b763ede873c23c8651bd18eba0c62e929b496ba5Jordan Rose 6675960f4aeac9760198c80e05d70d8dadb1db0ff0eAnna Zaks // We are not bifurcating and we do have a Decl, so just inline. 6685960f4aeac9760198c80e05d70d8dadb1db0ff0eAnna Zaks if (inlineCall(*Call, D, Bldr, Pred, State)) 6695960f4aeac9760198c80e05d70d8dadb1db0ff0eAnna Zaks return; 670e90d3f847dcce76237078b67db8895eb7a24189eAnna Zaks } 671e81ce256b62717dd846bd19aecc4115a0dcd4995Anna Zaks } 67269f87c956b3ac2b80124fd9604af012e1061473aJordan Rose 67369f87c956b3ac2b80124fd9604af012e1061473aJordan Rose // If we can't inline it, handle the return value and invalidate the regions. 674e90d3f847dcce76237078b67db8895eb7a24189eAnna Zaks conservativeEvalCall(*Call, Bldr, Pred, State); 675e90d3f847dcce76237078b67db8895eb7a24189eAnna Zaks} 67669f87c956b3ac2b80124fd9604af012e1061473aJordan Rose 677e90d3f847dcce76237078b67db8895eb7a24189eAnna Zaksvoid ExprEngine::BifurcateCall(const MemRegion *BifurReg, 678e90d3f847dcce76237078b67db8895eb7a24189eAnna Zaks const CallEvent &Call, const Decl *D, 679e90d3f847dcce76237078b67db8895eb7a24189eAnna Zaks NodeBuilder &Bldr, ExplodedNode *Pred) { 680e90d3f847dcce76237078b67db8895eb7a24189eAnna Zaks assert(BifurReg); 681b763ede873c23c8651bd18eba0c62e929b496ba5Jordan Rose BifurReg = BifurReg->StripCasts(); 682e90d3f847dcce76237078b67db8895eb7a24189eAnna Zaks 683e90d3f847dcce76237078b67db8895eb7a24189eAnna Zaks // Check if we've performed the split already - note, we only want 684e90d3f847dcce76237078b67db8895eb7a24189eAnna Zaks // to split the path once per memory region. 685e90d3f847dcce76237078b67db8895eb7a24189eAnna Zaks ProgramStateRef State = Pred->getState(); 6866960f6e53b0d9a69a460c99ec199470271ff9603Anna Zaks const unsigned int *BState = 6876960f6e53b0d9a69a460c99ec199470271ff9603Anna Zaks State->get<DynamicDispatchBifurcationMap>(BifurReg); 6885960f4aeac9760198c80e05d70d8dadb1db0ff0eAnna Zaks if (BState) { 6895960f4aeac9760198c80e05d70d8dadb1db0ff0eAnna Zaks // If we are on "inline path", keep inlining if possible. 6906960f6e53b0d9a69a460c99ec199470271ff9603Anna Zaks if (*BState == DynamicDispatchModeInlined) 6915960f4aeac9760198c80e05d70d8dadb1db0ff0eAnna Zaks if (inlineCall(Call, D, Bldr, Pred, State)) 6925960f4aeac9760198c80e05d70d8dadb1db0ff0eAnna Zaks return; 6935960f4aeac9760198c80e05d70d8dadb1db0ff0eAnna Zaks // If inline failed, or we are on the path where we assume we 6945960f4aeac9760198c80e05d70d8dadb1db0ff0eAnna Zaks // don't have enough info about the receiver to inline, conjure the 6955960f4aeac9760198c80e05d70d8dadb1db0ff0eAnna Zaks // return value and invalidate the regions. 6965960f4aeac9760198c80e05d70d8dadb1db0ff0eAnna Zaks conservativeEvalCall(Call, Bldr, Pred, State); 6975960f4aeac9760198c80e05d70d8dadb1db0ff0eAnna Zaks return; 698e90d3f847dcce76237078b67db8895eb7a24189eAnna Zaks } 699e90d3f847dcce76237078b67db8895eb7a24189eAnna Zaks 700e90d3f847dcce76237078b67db8895eb7a24189eAnna Zaks // If we got here, this is the first time we process a message to this 701e90d3f847dcce76237078b67db8895eb7a24189eAnna Zaks // region, so split the path. 702e90d3f847dcce76237078b67db8895eb7a24189eAnna Zaks ProgramStateRef IState = 7036960f6e53b0d9a69a460c99ec199470271ff9603Anna Zaks State->set<DynamicDispatchBifurcationMap>(BifurReg, 7046960f6e53b0d9a69a460c99ec199470271ff9603Anna Zaks DynamicDispatchModeInlined); 705e90d3f847dcce76237078b67db8895eb7a24189eAnna Zaks inlineCall(Call, D, Bldr, Pred, IState); 706e90d3f847dcce76237078b67db8895eb7a24189eAnna Zaks 707e90d3f847dcce76237078b67db8895eb7a24189eAnna Zaks ProgramStateRef NoIState = 7086960f6e53b0d9a69a460c99ec199470271ff9603Anna Zaks State->set<DynamicDispatchBifurcationMap>(BifurReg, 7096960f6e53b0d9a69a460c99ec199470271ff9603Anna Zaks DynamicDispatchModeConservative); 710e90d3f847dcce76237078b67db8895eb7a24189eAnna Zaks conservativeEvalCall(Call, Bldr, Pred, NoIState); 711e90d3f847dcce76237078b67db8895eb7a24189eAnna Zaks 712e90d3f847dcce76237078b67db8895eb7a24189eAnna Zaks NumOfDynamicDispatchPathSplits++; 713e90d3f847dcce76237078b67db8895eb7a24189eAnna Zaks return; 71469f87c956b3ac2b80124fd9604af012e1061473aJordan Rose} 71569f87c956b3ac2b80124fd9604af012e1061473aJordan Rose 716e90d3f847dcce76237078b67db8895eb7a24189eAnna Zaks 717294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenekvoid ExprEngine::VisitReturnStmt(const ReturnStmt *RS, ExplodedNode *Pred, 718294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNodeSet &Dst) { 719256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek 720256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek ExplodedNodeSet dstPreVisit; 721256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek getCheckerManager().runCheckersForPreStmt(dstPreVisit, Pred, RS, *this); 722256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek 72366c486f275531df6362b3511fc3af6563561801bTed Kremenek StmtNodeBuilder B(dstPreVisit, Dst, *currBldrCtx); 724256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek 725256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek if (RS->getRetValue()) { 726256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek for (ExplodedNodeSet::iterator it = dstPreVisit.begin(), 727256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek ei = dstPreVisit.end(); it != ei; ++it) { 728256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek B.generateNode(RS, *it, (*it)->getState()); 729294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 730294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 731294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek} 732