ExprEngineCallAndReturn.cpp revision 3bbd8cd831788c506f2980293eb3c7e1b3ca2501
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 14294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek#include "clang/StaticAnalyzer/Core/CheckerManager.h" 15294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek#include "clang/StaticAnalyzer/Core/PathSensitive/ExprEngine.h" 16e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose#include "clang/StaticAnalyzer/Core/PathSensitive/ObjCMessage.h" 17b2c60b04a597cc5ba4154837cf8e0a155a376fd7Argyrios Kyrtzidis#include "llvm/Support/SaveAndRestore.h" 18294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek#include "clang/AST/DeclCXX.h" 19294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 20294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenekusing namespace clang; 21294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenekusing namespace ento; 22294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 233070e13dca5bbefa32acb80ce4a7b217a6220983Ted Kremenekvoid ExprEngine::processCallEnter(CallEnter CE, ExplodedNode *Pred) { 243070e13dca5bbefa32acb80ce4a7b217a6220983Ted Kremenek // Get the entry block in the CFG of the callee. 250849ade4bb3e90c2fc0ce01ccd330f76f91da732Ted Kremenek const StackFrameContext *calleeCtx = CE.getCalleeContext(); 260849ade4bb3e90c2fc0ce01ccd330f76f91da732Ted Kremenek const CFG *CalleeCFG = calleeCtx->getCFG(); 273070e13dca5bbefa32acb80ce4a7b217a6220983Ted Kremenek const CFGBlock *Entry = &(CalleeCFG->getEntry()); 283070e13dca5bbefa32acb80ce4a7b217a6220983Ted Kremenek 293070e13dca5bbefa32acb80ce4a7b217a6220983Ted Kremenek // Validate the CFG. 303070e13dca5bbefa32acb80ce4a7b217a6220983Ted Kremenek assert(Entry->empty()); 313070e13dca5bbefa32acb80ce4a7b217a6220983Ted Kremenek assert(Entry->succ_size() == 1); 323070e13dca5bbefa32acb80ce4a7b217a6220983Ted Kremenek 333070e13dca5bbefa32acb80ce4a7b217a6220983Ted Kremenek // Get the solitary sucessor. 343070e13dca5bbefa32acb80ce4a7b217a6220983Ted Kremenek const CFGBlock *Succ = *(Entry->succ_begin()); 353070e13dca5bbefa32acb80ce4a7b217a6220983Ted Kremenek 363070e13dca5bbefa32acb80ce4a7b217a6220983Ted Kremenek // Construct an edge representing the starting location in the callee. 370849ade4bb3e90c2fc0ce01ccd330f76f91da732Ted Kremenek BlockEdge Loc(Entry, Succ, calleeCtx); 383070e13dca5bbefa32acb80ce4a7b217a6220983Ted Kremenek 393070e13dca5bbefa32acb80ce4a7b217a6220983Ted Kremenek // Construct a new state which contains the mapping from actual to 403070e13dca5bbefa32acb80ce4a7b217a6220983Ted Kremenek // formal arguments. 410849ade4bb3e90c2fc0ce01ccd330f76f91da732Ted Kremenek const LocationContext *callerCtx = Pred->getLocationContext(); 428bef8238181a30e52dea380789a7e2d760eac532Ted Kremenek ProgramStateRef state = Pred->getState()->enterStackFrame(callerCtx, 430849ade4bb3e90c2fc0ce01ccd330f76f91da732Ted Kremenek calleeCtx); 443070e13dca5bbefa32acb80ce4a7b217a6220983Ted Kremenek 453070e13dca5bbefa32acb80ce4a7b217a6220983Ted Kremenek // Construct a new node and add it to the worklist. 463070e13dca5bbefa32acb80ce4a7b217a6220983Ted Kremenek bool isNew; 473070e13dca5bbefa32acb80ce4a7b217a6220983Ted Kremenek ExplodedNode *Node = G.getNode(Loc, state, false, &isNew); 483070e13dca5bbefa32acb80ce4a7b217a6220983Ted Kremenek Node->addPredecessor(Pred, G); 493070e13dca5bbefa32acb80ce4a7b217a6220983Ted Kremenek if (isNew) 503070e13dca5bbefa32acb80ce4a7b217a6220983Ted Kremenek Engine.getWorkList()->enqueue(Node); 51294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek} 52294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 53256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenekstatic const ReturnStmt *getReturnStmt(const ExplodedNode *Node) { 54256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek while (Node) { 55256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek const ProgramPoint &PP = Node->getLocation(); 56256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek // Skip any BlockEdges. 57256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek if (isa<BlockEdge>(PP) || isa<CallExit>(PP)) { 58256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek assert(Node->pred_size() == 1); 59256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek Node = *Node->pred_begin(); 60256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek continue; 61256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek } 62256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek if (const StmtPoint *SP = dyn_cast<StmtPoint>(&PP)) { 63256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek const Stmt *S = SP->getStmt(); 64256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek return dyn_cast<ReturnStmt>(S); 65256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek } 66256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek break; 67256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek } 68256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek return 0; 69256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek} 70256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek 71894212e9510299abb203801e014fec76b7926a05Ted Kremenekvoid ExprEngine::processCallExit(ExplodedNode *Pred) { 728bef8238181a30e52dea380789a7e2d760eac532Ted Kremenek ProgramStateRef state = Pred->getState(); 73294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek const StackFrameContext *calleeCtx = 74894212e9510299abb203801e014fec76b7926a05Ted Kremenek Pred->getLocationContext()->getCurrentStackFrame(); 75256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek const LocationContext *callerCtx = calleeCtx->getParent(); 76294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek const Stmt *CE = calleeCtx->getCallSite(); 77294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 78294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // If the callee returns an expression, bind its value to CallExpr. 79256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek if (const ReturnStmt *RS = getReturnStmt(Pred)) { 805eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek const LocationContext *LCtx = Pred->getLocationContext(); 81256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek SVal V = state->getSVal(RS, LCtx); 82256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek state = state->BindExpr(CE, callerCtx, V); 83294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 84294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 85294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // Bind the constructed object value to CXXConstructExpr. 86294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek if (const CXXConstructExpr *CCE = dyn_cast<CXXConstructExpr>(CE)) { 87294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek const CXXThisRegion *ThisR = 88294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek getCXXThisRegion(CCE->getConstructor()->getParent(), calleeCtx); 89294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 90294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek SVal ThisV = state->getSVal(ThisR); 91294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // Always bind the region to the CXXConstructExpr. 925eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek state = state->BindExpr(CCE, Pred->getLocationContext(), ThisV); 93294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 94294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 95256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek static SimpleProgramPointTag returnTag("ExprEngine : Call Return"); 96256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek PostStmt Loc(CE, callerCtx, &returnTag); 97894212e9510299abb203801e014fec76b7926a05Ted Kremenek bool isNew; 98894212e9510299abb203801e014fec76b7926a05Ted Kremenek ExplodedNode *N = G.getNode(Loc, state, false, &isNew); 99894212e9510299abb203801e014fec76b7926a05Ted Kremenek N->addPredecessor(Pred, G); 100894212e9510299abb203801e014fec76b7926a05Ted Kremenek if (!isNew) 101894212e9510299abb203801e014fec76b7926a05Ted Kremenek return; 102894212e9510299abb203801e014fec76b7926a05Ted Kremenek 103894212e9510299abb203801e014fec76b7926a05Ted Kremenek // Perform the post-condition check of the CallExpr. 104894212e9510299abb203801e014fec76b7926a05Ted Kremenek ExplodedNodeSet Dst; 105256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek NodeBuilderContext Ctx(Engine, calleeCtx->getCallSiteBlock(), N); 106256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek SaveAndRestore<const NodeBuilderContext*> NBCSave(currentBuilderContext, 107256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek &Ctx); 108256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek SaveAndRestore<unsigned> CBISave(currentStmtIdx, calleeCtx->getIndex()); 109256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek 110514f2c9dcb9e04b52929c5b141a6fe88bd68b33fTed Kremenek getCheckerManager().runCheckersForPostStmt(Dst, N, CE, *this, 111514f2c9dcb9e04b52929c5b141a6fe88bd68b33fTed Kremenek /* wasInlined */ true); 112894212e9510299abb203801e014fec76b7926a05Ted Kremenek 113242384ddb0e0b65dd7e9e0ac0cf3c31cf98b06a6Ted Kremenek // Enqueue the next element in the block. 114242384ddb0e0b65dd7e9e0ac0cf3c31cf98b06a6Ted Kremenek for (ExplodedNodeSet::iterator I = Dst.begin(), E = Dst.end(); I != E; ++I) { 115242384ddb0e0b65dd7e9e0ac0cf3c31cf98b06a6Ted Kremenek Engine.getWorkList()->enqueue(*I, 116242384ddb0e0b65dd7e9e0ac0cf3c31cf98b06a6Ted Kremenek calleeCtx->getCallSiteBlock(), 117242384ddb0e0b65dd7e9e0ac0cf3c31cf98b06a6Ted Kremenek calleeCtx->getIndex()+1); 118242384ddb0e0b65dd7e9e0ac0cf3c31cf98b06a6Ted Kremenek } 119294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek} 120294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 1210849ade4bb3e90c2fc0ce01ccd330f76f91da732Ted Kremenekstatic unsigned getNumberStackFrames(const LocationContext *LCtx) { 1220849ade4bb3e90c2fc0ce01ccd330f76f91da732Ted Kremenek unsigned count = 0; 1230849ade4bb3e90c2fc0ce01ccd330f76f91da732Ted Kremenek while (LCtx) { 1240849ade4bb3e90c2fc0ce01ccd330f76f91da732Ted Kremenek if (isa<StackFrameContext>(LCtx)) 1250849ade4bb3e90c2fc0ce01ccd330f76f91da732Ted Kremenek ++count; 1260849ade4bb3e90c2fc0ce01ccd330f76f91da732Ted Kremenek LCtx = LCtx->getParent(); 1270849ade4bb3e90c2fc0ce01ccd330f76f91da732Ted Kremenek } 1280849ade4bb3e90c2fc0ce01ccd330f76f91da732Ted Kremenek return count; 1290849ade4bb3e90c2fc0ce01ccd330f76f91da732Ted Kremenek} 1300849ade4bb3e90c2fc0ce01ccd330f76f91da732Ted Kremenek 1316cc0969ab37c614d6cf496f2ed6d2fca397a0133Anna Zaks// Determine if we should inline the call. 1325903a373db3d27794c90b25687e0dd6adb0e497dAnna Zaksbool ExprEngine::shouldInlineDecl(const FunctionDecl *FD, ExplodedNode *Pred) { 1336cc0969ab37c614d6cf496f2ed6d2fca397a0133Anna Zaks AnalysisDeclContext *CalleeADC = AMgr.getAnalysisDeclContext(FD); 1346cc0969ab37c614d6cf496f2ed6d2fca397a0133Anna Zaks const CFG *CalleeCFG = CalleeADC->getCFG(); 1356cc0969ab37c614d6cf496f2ed6d2fca397a0133Anna Zaks 1366cc0969ab37c614d6cf496f2ed6d2fca397a0133Anna Zaks if (getNumberStackFrames(Pred->getLocationContext()) 1376cc0969ab37c614d6cf496f2ed6d2fca397a0133Anna Zaks == AMgr.InlineMaxStackDepth) 1386cc0969ab37c614d6cf496f2ed6d2fca397a0133Anna Zaks return false; 1396cc0969ab37c614d6cf496f2ed6d2fca397a0133Anna Zaks 1403bbd8cd831788c506f2980293eb3c7e1b3ca2501Anna Zaks if (FunctionSummaries->hasReachedMaxBlockCount(FD)) 1413bbd8cd831788c506f2980293eb3c7e1b3ca2501Anna Zaks return false; 1423bbd8cd831788c506f2980293eb3c7e1b3ca2501Anna Zaks 1436cc0969ab37c614d6cf496f2ed6d2fca397a0133Anna Zaks if (CalleeCFG->getNumBlockIDs() > AMgr.InlineMaxFunctionSize) 1446cc0969ab37c614d6cf496f2ed6d2fca397a0133Anna Zaks return false; 1456cc0969ab37c614d6cf496f2ed6d2fca397a0133Anna Zaks 1466cc0969ab37c614d6cf496f2ed6d2fca397a0133Anna Zaks return true; 1476cc0969ab37c614d6cf496f2ed6d2fca397a0133Anna Zaks} 1486cc0969ab37c614d6cf496f2ed6d2fca397a0133Anna Zaks 1495903a373db3d27794c90b25687e0dd6adb0e497dAnna Zaks// For now, skip inlining variadic functions. 1505903a373db3d27794c90b25687e0dd6adb0e497dAnna Zaks// We also don't inline blocks. 1515903a373db3d27794c90b25687e0dd6adb0e497dAnna Zaksstatic bool shouldInlineCallExpr(const CallExpr *CE, ExprEngine *E) { 1525903a373db3d27794c90b25687e0dd6adb0e497dAnna Zaks if (!E->getAnalysisManager().shouldInlineCall()) 1535903a373db3d27794c90b25687e0dd6adb0e497dAnna Zaks return false; 1545903a373db3d27794c90b25687e0dd6adb0e497dAnna Zaks QualType callee = CE->getCallee()->getType(); 1555903a373db3d27794c90b25687e0dd6adb0e497dAnna Zaks const FunctionProtoType *FT = 0; 1565903a373db3d27794c90b25687e0dd6adb0e497dAnna Zaks if (const PointerType *PT = callee->getAs<PointerType>()) 1575903a373db3d27794c90b25687e0dd6adb0e497dAnna Zaks FT = dyn_cast<FunctionProtoType>(PT->getPointeeType()); 1585903a373db3d27794c90b25687e0dd6adb0e497dAnna Zaks else if (const BlockPointerType *BT = callee->getAs<BlockPointerType>()) { 1595903a373db3d27794c90b25687e0dd6adb0e497dAnna Zaks // FIXME: inline blocks. 1605903a373db3d27794c90b25687e0dd6adb0e497dAnna Zaks // FT = dyn_cast<FunctionProtoType>(BT->getPointeeType()); 1615903a373db3d27794c90b25687e0dd6adb0e497dAnna Zaks (void) BT; 1625903a373db3d27794c90b25687e0dd6adb0e497dAnna Zaks return false; 1635903a373db3d27794c90b25687e0dd6adb0e497dAnna Zaks } 1645903a373db3d27794c90b25687e0dd6adb0e497dAnna Zaks // If we have no prototype, assume the function is okay. 1655903a373db3d27794c90b25687e0dd6adb0e497dAnna Zaks if (!FT) 1665903a373db3d27794c90b25687e0dd6adb0e497dAnna Zaks return true; 1675903a373db3d27794c90b25687e0dd6adb0e497dAnna Zaks 1685903a373db3d27794c90b25687e0dd6adb0e497dAnna Zaks // Skip inlining of variadic functions. 1695903a373db3d27794c90b25687e0dd6adb0e497dAnna Zaks return !FT->isVariadic(); 1705903a373db3d27794c90b25687e0dd6adb0e497dAnna Zaks} 1715903a373db3d27794c90b25687e0dd6adb0e497dAnna Zaks 172256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenekbool ExprEngine::InlineCall(ExplodedNodeSet &Dst, 173256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek const CallExpr *CE, 174256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek ExplodedNode *Pred) { 1755903a373db3d27794c90b25687e0dd6adb0e497dAnna Zaks if (!shouldInlineCallExpr(CE, this)) 1765903a373db3d27794c90b25687e0dd6adb0e497dAnna Zaks return false; 1775903a373db3d27794c90b25687e0dd6adb0e497dAnna Zaks 1788bef8238181a30e52dea380789a7e2d760eac532Ted Kremenek ProgramStateRef state = Pred->getState(); 179256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek const Expr *Callee = CE->getCallee(); 180256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek const FunctionDecl *FD = 1816cc0969ab37c614d6cf496f2ed6d2fca397a0133Anna Zaks state->getSVal(Callee, Pred->getLocationContext()).getAsFunctionDecl(); 182256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek if (!FD || !FD->hasBody(FD)) 183256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek return false; 184256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek 185256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek switch (CE->getStmtClass()) { 186256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek default: 187256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek // FIXME: Handle C++. 188256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek break; 189256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek case Stmt::CallExprClass: { 1905903a373db3d27794c90b25687e0dd6adb0e497dAnna Zaks if (!shouldInlineDecl(FD, Pred)) 1918235f9c9c8b3d1737d1c6bd57f7ba3f616b92392Anna Zaks return false; 1928235f9c9c8b3d1737d1c6bd57f7ba3f616b92392Anna Zaks 1938235f9c9c8b3d1737d1c6bd57f7ba3f616b92392Anna Zaks // Construct a new stack frame for the callee. 1946cc0969ab37c614d6cf496f2ed6d2fca397a0133Anna Zaks AnalysisDeclContext *CalleeADC = AMgr.getAnalysisDeclContext(FD); 195256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek const StackFrameContext *CallerSFC = 196256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek Pred->getLocationContext()->getCurrentStackFrame(); 197256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek const StackFrameContext *CalleeSFC = 198256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek CalleeADC->getStackFrame(CallerSFC, CE, 199256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek currentBuilderContext->getBlock(), 200256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek currentStmtIdx); 201256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek 202256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek CallEnter Loc(CE, CalleeSFC, Pred->getLocationContext()); 203256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek bool isNew; 204256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek ExplodedNode *N = G.getNode(Loc, state, false, &isNew); 205256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek N->addPredecessor(Pred, G); 206256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek if (isNew) 207256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek Engine.getWorkList()->enqueue(N); 208256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek return true; 209256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek } 210256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek } 211256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek return false; 212256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek} 213256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek 2142cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaksstatic bool isPointerToConst(const ParmVarDecl *ParamDecl) { 2152cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks QualType PointeeTy = ParamDecl->getOriginalType()->getPointeeType(); 2162cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks if (PointeeTy != QualType() && PointeeTy.isConstQualified() && 2172cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks !PointeeTy->isAnyPointerType() && !PointeeTy->isReferenceType()) { 2182cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks return true; 2192cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks } 2202cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks return false; 2212cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks} 2222cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks 2232cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks// Try to retrieve the function declaration and find the function parameter 2242cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks// types which are pointers/references to a non-pointer const. 2252cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks// We do not invalidate the corresponding argument regions. 2262cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaksstatic void findPtrToConstParams(llvm::SmallSet<unsigned, 1> &PreserveArgs, 2272cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks const CallOrObjCMessage &Call) { 2282cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks const Decl *CallDecl = Call.getDecl(); 2292cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks if (!CallDecl) 2302cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks return; 2312cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks 2322cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks if (const FunctionDecl *FDecl = dyn_cast<FunctionDecl>(CallDecl)) { 2330d389b819c33bdf0375694a8f141c8f02e002b18Anna Zaks const IdentifierInfo *II = FDecl->getIdentifier(); 2340d389b819c33bdf0375694a8f141c8f02e002b18Anna Zaks 2350d389b819c33bdf0375694a8f141c8f02e002b18Anna Zaks // List the cases, where the region should be invalidated even if the 2360d389b819c33bdf0375694a8f141c8f02e002b18Anna Zaks // argument is const. 2370d389b819c33bdf0375694a8f141c8f02e002b18Anna Zaks if (II) { 2380d389b819c33bdf0375694a8f141c8f02e002b18Anna Zaks StringRef FName = II->getName(); 23907d39a479cf8f20294407e749f9933da34ebecb7Anna Zaks // - 'int pthread_setspecific(ptheread_key k, const void *)' stores a 24007d39a479cf8f20294407e749f9933da34ebecb7Anna Zaks // value into thread local storage. The value can later be retrieved with 2410d389b819c33bdf0375694a8f141c8f02e002b18Anna Zaks // 'void *ptheread_getspecific(pthread_key)'. So even thought the 2420d389b819c33bdf0375694a8f141c8f02e002b18Anna Zaks // parameter is 'const void *', the region escapes through the call. 243ca23eb212c78ac5bc62d0881635579dbe7095639Anna Zaks // - funopen - sets a buffer for future IO calls. 24407d39a479cf8f20294407e749f9933da34ebecb7Anna Zaks // - ObjC functions that end with "NoCopy" can free memory, of the passed 24507d39a479cf8f20294407e749f9933da34ebecb7Anna Zaks // in buffer. 246ca23eb212c78ac5bc62d0881635579dbe7095639Anna Zaks // - Many CF containers allow objects to escape through custom 247ca23eb212c78ac5bc62d0881635579dbe7095639Anna Zaks // allocators/deallocators upon container construction. 24807d39a479cf8f20294407e749f9933da34ebecb7Anna Zaks if (FName == "pthread_setspecific" || 249ca23eb212c78ac5bc62d0881635579dbe7095639Anna Zaks FName == "funopen" || 250ca23eb212c78ac5bc62d0881635579dbe7095639Anna Zaks FName.endswith("NoCopy") || 251ca23eb212c78ac5bc62d0881635579dbe7095639Anna Zaks Call.isCFCGAllowingEscape(FName)) 2520d389b819c33bdf0375694a8f141c8f02e002b18Anna Zaks return; 2530d389b819c33bdf0375694a8f141c8f02e002b18Anna Zaks } 2540d389b819c33bdf0375694a8f141c8f02e002b18Anna Zaks 2552cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks for (unsigned Idx = 0, E = Call.getNumArgs(); Idx != E; ++Idx) { 2562cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks if (FDecl && Idx < FDecl->getNumParams()) { 2572cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks if (isPointerToConst(FDecl->getParamDecl(Idx))) 2582cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks PreserveArgs.insert(Idx); 2592cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks } 2602cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks } 2612cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks return; 2622cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks } 2632cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks 2642cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks if (const ObjCMethodDecl *MDecl = dyn_cast<ObjCMethodDecl>(CallDecl)) { 2652cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks assert(MDecl->param_size() <= Call.getNumArgs()); 2662cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks unsigned Idx = 0; 2672cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks for (clang::ObjCMethodDecl::param_const_iterator 2682cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks I = MDecl->param_begin(), E = MDecl->param_end(); I != E; ++I, ++Idx) { 2692cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks if (isPointerToConst(*I)) 2702cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks PreserveArgs.insert(Idx); 2712cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks } 2722cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks return; 2732cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks } 2742cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks} 2752cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks 2768bef8238181a30e52dea380789a7e2d760eac532Ted KremenekProgramStateRef 2778bef8238181a30e52dea380789a7e2d760eac532Ted KremenekExprEngine::invalidateArguments(ProgramStateRef State, 278e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose const CallOrObjCMessage &Call, 279e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose const LocationContext *LC) { 280e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose SmallVector<const MemRegion *, 8> RegionsToInvalidate; 281e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose 282e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose if (Call.isObjCMessage()) { 283e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // Invalidate all instance variables of the receiver of an ObjC message. 284e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // FIXME: We should be able to do better with inter-procedural analysis. 285e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose if (const MemRegion *MR = Call.getInstanceMessageReceiver(LC).getAsRegion()) 286e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose RegionsToInvalidate.push_back(MR); 287e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose 288e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose } else if (Call.isCXXCall()) { 289e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // Invalidate all instance variables for the callee of a C++ method call. 290e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // FIXME: We should be able to do better with inter-procedural analysis. 291e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // FIXME: We can probably do better for const versus non-const methods. 292e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose if (const MemRegion *Callee = Call.getCXXCallee().getAsRegion()) 293e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose RegionsToInvalidate.push_back(Callee); 294e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose 295e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose } else if (Call.isFunctionCall()) { 296e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // Block calls invalidate all captured-by-reference values. 2972cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks SVal CalleeVal = Call.getFunctionCallee(); 2982cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks if (const MemRegion *Callee = CalleeVal.getAsRegion()) { 299e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose if (isa<BlockDataRegion>(Callee)) 300e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose RegionsToInvalidate.push_back(Callee); 301e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose } 302e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose } 303e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose 3042cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks // Indexes of arguments whose values will be preserved by the call. 3052cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks llvm::SmallSet<unsigned, 1> PreserveArgs; 3062cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks findPtrToConstParams(PreserveArgs, Call); 3072cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks 308e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose for (unsigned idx = 0, e = Call.getNumArgs(); idx != e; ++idx) { 3092cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks if (PreserveArgs.count(idx)) 3102cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks continue; 3112cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks 312e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose SVal V = Call.getArgSVal(idx); 313e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose 314e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // If we are passing a location wrapped as an integer, unwrap it and 315e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // invalidate the values referred by the location. 316e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose if (nonloc::LocAsInteger *Wrapped = dyn_cast<nonloc::LocAsInteger>(&V)) 317e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose V = Wrapped->getLoc(); 318e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose else if (!isa<Loc>(V)) 319e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose continue; 320e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose 321e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose if (const MemRegion *R = V.getAsRegion()) { 322e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // Invalidate the value of the variable passed by reference. 323e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose 324e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // Are we dealing with an ElementRegion? If the element type is 3252cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks // a basic integer type (e.g., char, int) and the underlying region 326e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // is a variable region then strip off the ElementRegion. 327e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // FIXME: We really need to think about this for the general case 328e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // as sometimes we are reasoning about arrays and other times 329e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // about (char*), etc., is just a form of passing raw bytes. 330e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // e.g., void *p = alloca(); foo((char*)p); 331e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose if (const ElementRegion *ER = dyn_cast<ElementRegion>(R)) { 332e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // Checking for 'integral type' is probably too promiscuous, but 333e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // we'll leave it in for now until we have a systematic way of 334e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // handling all of these cases. Eventually we need to come up 335e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // with an interface to StoreManager so that this logic can be 3362cbe791d3e9b26f30196c4852da75d9ad67b4ad9Anna Zaks // appropriately delegated to the respective StoreManagers while 337e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // still allowing us to do checker-specific logic (e.g., 338e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // invalidating reference counts), probably via callbacks. 339e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose if (ER->getElementType()->isIntegralOrEnumerationType()) { 340e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose const MemRegion *superReg = ER->getSuperRegion(); 341e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose if (isa<VarRegion>(superReg) || isa<FieldRegion>(superReg) || 342e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose isa<ObjCIvarRegion>(superReg)) 343e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose R = cast<TypedRegion>(superReg); 344e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose } 345e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // FIXME: What about layers of ElementRegions? 346e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose } 347e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose 348e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // Mark this region for invalidation. We batch invalidate regions 349e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // below for efficiency. 350e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose RegionsToInvalidate.push_back(R); 351e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose } else { 352e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // Nuke all other arguments passed by reference. 353e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // FIXME: is this necessary or correct? This handles the non-Region 354e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // cases. Is it ever valid to store to these? 355e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose State = State->unbindLoc(cast<Loc>(V)); 356e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose } 357e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose } 358e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose 359e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // Invalidate designated regions using the batch invalidation API. 360e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose 361e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // FIXME: We can have collisions on the conjured symbol if the 362e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // expression *I also creates conjured symbols. We probably want 363e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // to identify conjured symbols by an expression pair: the enclosing 364e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // expression (the context) and the expression itself. This should 365e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // disambiguate conjured symbols. 366ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks unsigned Count = currentBuilderContext->getCurrentBlockCount(); 367e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose StoreManager::InvalidatedSymbols IS; 368e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose 369e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // NOTE: Even if RegionsToInvalidate is empty, we may still invalidate 370e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // global variables. 371e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose return State->invalidateRegions(RegionsToInvalidate, 3723133f79cf451e6302dd05262b4bb53a3e4fd6300Ted Kremenek Call.getOriginExpr(), Count, LC, 373eb31a76d1cdaaf8874c549dc6bd964ff270d3822Anna Zaks &IS, &Call); 374e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose 375e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose} 376e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose 3775903a373db3d27794c90b25687e0dd6adb0e497dAnna Zaksstatic ProgramStateRef getReplayWithoutInliningState(ExplodedNode *&N, 3785903a373db3d27794c90b25687e0dd6adb0e497dAnna Zaks const CallExpr *CE) { 3795903a373db3d27794c90b25687e0dd6adb0e497dAnna Zaks void *ReplayState = N->getState()->get<ReplayWithoutInlining>(); 3805903a373db3d27794c90b25687e0dd6adb0e497dAnna Zaks if (!ReplayState) 3815903a373db3d27794c90b25687e0dd6adb0e497dAnna Zaks return 0; 3825903a373db3d27794c90b25687e0dd6adb0e497dAnna Zaks const CallExpr *ReplayCE = reinterpret_cast<const CallExpr*>(ReplayState); 3835903a373db3d27794c90b25687e0dd6adb0e497dAnna Zaks if (CE == ReplayCE) { 3845903a373db3d27794c90b25687e0dd6adb0e497dAnna Zaks return N->getState()->remove<ReplayWithoutInlining>(); 38510520d76044e8fff71d414f30c21b449fd104960Ted Kremenek } 3865903a373db3d27794c90b25687e0dd6adb0e497dAnna Zaks return 0; 38710520d76044e8fff71d414f30c21b449fd104960Ted Kremenek} 38810520d76044e8fff71d414f30c21b449fd104960Ted Kremenek 389294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenekvoid ExprEngine::VisitCallExpr(const CallExpr *CE, ExplodedNode *Pred, 390294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNodeSet &dst) { 391294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // Perform the previsit of the CallExpr. 392294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNodeSet dstPreVisit; 393294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek getCheckerManager().runCheckersForPreStmt(dstPreVisit, Pred, CE, *this); 394294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 395294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // Now evaluate the call itself. 396294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek class DefaultEval : public GraphExpander { 397294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExprEngine &Eng; 398294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek const CallExpr *CE; 399294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek public: 400294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 401294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek DefaultEval(ExprEngine &eng, const CallExpr *ce) 402294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek : Eng(eng), CE(ce) {} 403294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek virtual void expandGraph(ExplodedNodeSet &Dst, ExplodedNode *Pred) { 4045903a373db3d27794c90b25687e0dd6adb0e497dAnna Zaks 4055903a373db3d27794c90b25687e0dd6adb0e497dAnna Zaks ProgramStateRef state = getReplayWithoutInliningState(Pred, CE); 4065903a373db3d27794c90b25687e0dd6adb0e497dAnna Zaks 4075903a373db3d27794c90b25687e0dd6adb0e497dAnna Zaks // First, try to inline the call. 4085903a373db3d27794c90b25687e0dd6adb0e497dAnna Zaks if (state == 0 && Eng.InlineCall(Dst, CE, Pred)) 409294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek return; 410500abad7edfcc2409b18dd616cdbc28a094926f5Jordy Rose 411500abad7edfcc2409b18dd616cdbc28a094926f5Jordy Rose // First handle the return value. 412aa0aeb1cbe117db68d35700cb3a34aace0f99b99Anna Zaks StmtNodeBuilder Bldr(Pred, Dst, *Eng.currentBuilderContext); 413500abad7edfcc2409b18dd616cdbc28a094926f5Jordy Rose 414500abad7edfcc2409b18dd616cdbc28a094926f5Jordy Rose // Get the callee. 415294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek const Expr *Callee = CE->getCallee()->IgnoreParens(); 4165903a373db3d27794c90b25687e0dd6adb0e497dAnna Zaks if (state == 0) 4175903a373db3d27794c90b25687e0dd6adb0e497dAnna Zaks state = Pred->getState(); 4185eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek SVal L = state->getSVal(Callee, Pred->getLocationContext()); 419500abad7edfcc2409b18dd616cdbc28a094926f5Jordy Rose 420500abad7edfcc2409b18dd616cdbc28a094926f5Jordy Rose // Figure out the result type. We do this dance to handle references. 421500abad7edfcc2409b18dd616cdbc28a094926f5Jordy Rose QualType ResultTy; 422500abad7edfcc2409b18dd616cdbc28a094926f5Jordy Rose if (const FunctionDecl *FD = L.getAsFunctionDecl()) 423500abad7edfcc2409b18dd616cdbc28a094926f5Jordy Rose ResultTy = FD->getResultType(); 424500abad7edfcc2409b18dd616cdbc28a094926f5Jordy Rose else 425500abad7edfcc2409b18dd616cdbc28a094926f5Jordy Rose ResultTy = CE->getType(); 426500abad7edfcc2409b18dd616cdbc28a094926f5Jordy Rose 427500abad7edfcc2409b18dd616cdbc28a094926f5Jordy Rose if (CE->isLValue()) 428500abad7edfcc2409b18dd616cdbc28a094926f5Jordy Rose ResultTy = Eng.getContext().getPointerType(ResultTy); 429500abad7edfcc2409b18dd616cdbc28a094926f5Jordy Rose 430500abad7edfcc2409b18dd616cdbc28a094926f5Jordy Rose // Conjure a symbol value to use as the result. 431500abad7edfcc2409b18dd616cdbc28a094926f5Jordy Rose SValBuilder &SVB = Eng.getSValBuilder(); 432ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks unsigned Count = Eng.currentBuilderContext->getCurrentBlockCount(); 4333133f79cf451e6302dd05262b4bb53a3e4fd6300Ted Kremenek const LocationContext *LCtx = Pred->getLocationContext(); 4343133f79cf451e6302dd05262b4bb53a3e4fd6300Ted Kremenek SVal RetVal = SVB.getConjuredSymbolVal(0, CE, LCtx, ResultTy, Count); 435500abad7edfcc2409b18dd616cdbc28a094926f5Jordy Rose 436e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // Generate a new state with the return value set. 4375eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek state = state->BindExpr(CE, LCtx, RetVal); 438e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose 439e38dd95dddb8f1b38469c8d0e28aa1c660489324Jordy Rose // Invalidate the arguments. 4405eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek state = Eng.invalidateArguments(state, CallOrObjCMessage(CE, state, LCtx), 4415eca482fe895ea57bc82410222e6426c09e63284Ted Kremenek LCtx); 442500abad7edfcc2409b18dd616cdbc28a094926f5Jordy Rose 443fe27971d54d26997149d6b84057f04ff398d1d5dJordy Rose // And make the result node. 444ebae6d0209e1ec3d5ea14f9e63bd0d740218ed14Anna Zaks Bldr.generateNode(CE, Pred, state); 445294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 446294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek }; 447294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 448294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // Finally, evaluate the function call. We try each of the checkers 449294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // to see if the can evaluate the function call. 450294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNodeSet dstCallEvaluated; 451294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek DefaultEval defEval(*this, CE); 452294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek getCheckerManager().runCheckersForEvalCall(dstCallEvaluated, 453294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek dstPreVisit, 454294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek CE, *this, &defEval); 455294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 456294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // Finally, perform the post-condition check of the CallExpr and store 457294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek // the created nodes in 'Dst'. 458294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek getCheckerManager().runCheckersForPostStmt(dst, dstCallEvaluated, CE, 459294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek *this); 460294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek} 461294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek 462294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenekvoid ExprEngine::VisitReturnStmt(const ReturnStmt *RS, ExplodedNode *Pred, 463294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek ExplodedNodeSet &Dst) { 464256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek 465256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek ExplodedNodeSet dstPreVisit; 466256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek getCheckerManager().runCheckersForPreStmt(dstPreVisit, Pred, RS, *this); 467256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek 468256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek StmtNodeBuilder B(dstPreVisit, Dst, *currentBuilderContext); 469256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek 470256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek if (RS->getRetValue()) { 471256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek for (ExplodedNodeSet::iterator it = dstPreVisit.begin(), 472256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek ei = dstPreVisit.end(); it != ei; ++it) { 473256ef642f8feef22fd53be7efa868e8e34752eedTed Kremenek B.generateNode(RS, *it, (*it)->getState()); 474294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 475294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek } 476294fd0a62b95f512637910bf85c7efa6c2354b50Ted Kremenek} 477