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-rw-r--r--contrib/llvm/tools/clang/lib/Analysis/AnalysisDeclContext.cpp578
1 files changed, 578 insertions, 0 deletions
diff --git a/contrib/llvm/tools/clang/lib/Analysis/AnalysisDeclContext.cpp b/contrib/llvm/tools/clang/lib/Analysis/AnalysisDeclContext.cpp
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+++ b/contrib/llvm/tools/clang/lib/Analysis/AnalysisDeclContext.cpp
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+//== AnalysisDeclContext.cpp - Analysis context for Path Sens analysis -*- C++ -*-//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file defines AnalysisDeclContext, a class that manages the analysis context
+// data for path sensitive analysis.
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/Analysis/AnalysisContext.h"
+#include "BodyFarm.h"
+#include "clang/AST/ASTContext.h"
+#include "clang/AST/Decl.h"
+#include "clang/AST/DeclObjC.h"
+#include "clang/AST/DeclTemplate.h"
+#include "clang/AST/ParentMap.h"
+#include "clang/AST/StmtVisitor.h"
+#include "clang/Analysis/Analyses/CFGReachabilityAnalysis.h"
+#include "clang/Analysis/Analyses/LiveVariables.h"
+#include "clang/Analysis/Analyses/PseudoConstantAnalysis.h"
+#include "clang/Analysis/CFG.h"
+#include "clang/Analysis/CFGStmtMap.h"
+#include "clang/Analysis/Support/BumpVector.h"
+#include "llvm/ADT/SmallPtrSet.h"
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/raw_ostream.h"
+#include "llvm/Support/SaveAndRestore.h"
+
+using namespace clang;
+
+typedef llvm::DenseMap<const void *, ManagedAnalysis *> ManagedAnalysisMap;
+
+AnalysisDeclContext::AnalysisDeclContext(AnalysisDeclContextManager *Mgr,
+ const Decl *d,
+ const CFG::BuildOptions &buildOptions)
+ : Manager(Mgr),
+ D(d),
+ cfgBuildOptions(buildOptions),
+ forcedBlkExprs(0),
+ builtCFG(false),
+ builtCompleteCFG(false),
+ ReferencedBlockVars(0),
+ ManagedAnalyses(0)
+{
+ cfgBuildOptions.forcedBlkExprs = &forcedBlkExprs;
+}
+
+AnalysisDeclContext::AnalysisDeclContext(AnalysisDeclContextManager *Mgr,
+ const Decl *d)
+: Manager(Mgr),
+ D(d),
+ forcedBlkExprs(0),
+ builtCFG(false),
+ builtCompleteCFG(false),
+ ReferencedBlockVars(0),
+ ManagedAnalyses(0)
+{
+ cfgBuildOptions.forcedBlkExprs = &forcedBlkExprs;
+}
+
+AnalysisDeclContextManager::AnalysisDeclContextManager(bool useUnoptimizedCFG,
+ bool addImplicitDtors,
+ bool addInitializers,
+ bool addTemporaryDtors,
+ bool synthesizeBodies,
+ bool addStaticInitBranch)
+ : SynthesizeBodies(synthesizeBodies)
+{
+ cfgBuildOptions.PruneTriviallyFalseEdges = !useUnoptimizedCFG;
+ cfgBuildOptions.AddImplicitDtors = addImplicitDtors;
+ cfgBuildOptions.AddInitializers = addInitializers;
+ cfgBuildOptions.AddTemporaryDtors = addTemporaryDtors;
+ cfgBuildOptions.AddStaticInitBranches = addStaticInitBranch;
+}
+
+void AnalysisDeclContextManager::clear() {
+ for (ContextMap::iterator I = Contexts.begin(), E = Contexts.end(); I!=E; ++I)
+ delete I->second;
+ Contexts.clear();
+}
+
+static BodyFarm &getBodyFarm(ASTContext &C) {
+ static BodyFarm *BF = new BodyFarm(C);
+ return *BF;
+}
+
+Stmt *AnalysisDeclContext::getBody(bool &IsAutosynthesized) const {
+ IsAutosynthesized = false;
+ if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
+ Stmt *Body = FD->getBody();
+ if (!Body && Manager && Manager->synthesizeBodies()) {
+ IsAutosynthesized = true;
+ return getBodyFarm(getASTContext()).getBody(FD);
+ }
+ return Body;
+ }
+ else if (const ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(D))
+ return MD->getBody();
+ else if (const BlockDecl *BD = dyn_cast<BlockDecl>(D))
+ return BD->getBody();
+ else if (const FunctionTemplateDecl *FunTmpl
+ = dyn_cast_or_null<FunctionTemplateDecl>(D))
+ return FunTmpl->getTemplatedDecl()->getBody();
+
+ llvm_unreachable("unknown code decl");
+}
+
+Stmt *AnalysisDeclContext::getBody() const {
+ bool Tmp;
+ return getBody(Tmp);
+}
+
+bool AnalysisDeclContext::isBodyAutosynthesized() const {
+ bool Tmp;
+ getBody(Tmp);
+ return Tmp;
+}
+
+const ImplicitParamDecl *AnalysisDeclContext::getSelfDecl() const {
+ if (const ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(D))
+ return MD->getSelfDecl();
+ if (const BlockDecl *BD = dyn_cast<BlockDecl>(D)) {
+ // See if 'self' was captured by the block.
+ for (BlockDecl::capture_const_iterator it = BD->capture_begin(),
+ et = BD->capture_end(); it != et; ++it) {
+ const VarDecl *VD = it->getVariable();
+ if (VD->getName() == "self")
+ return dyn_cast<ImplicitParamDecl>(VD);
+ }
+ }
+
+ return NULL;
+}
+
+void AnalysisDeclContext::registerForcedBlockExpression(const Stmt *stmt) {
+ if (!forcedBlkExprs)
+ forcedBlkExprs = new CFG::BuildOptions::ForcedBlkExprs();
+ // Default construct an entry for 'stmt'.
+ if (const Expr *e = dyn_cast<Expr>(stmt))
+ stmt = e->IgnoreParens();
+ (void) (*forcedBlkExprs)[stmt];
+}
+
+const CFGBlock *
+AnalysisDeclContext::getBlockForRegisteredExpression(const Stmt *stmt) {
+ assert(forcedBlkExprs);
+ if (const Expr *e = dyn_cast<Expr>(stmt))
+ stmt = e->IgnoreParens();
+ CFG::BuildOptions::ForcedBlkExprs::const_iterator itr =
+ forcedBlkExprs->find(stmt);
+ assert(itr != forcedBlkExprs->end());
+ return itr->second;
+}
+
+/// Add each synthetic statement in the CFG to the parent map, using the
+/// source statement's parent.
+static void addParentsForSyntheticStmts(const CFG *TheCFG, ParentMap &PM) {
+ if (!TheCFG)
+ return;
+
+ for (CFG::synthetic_stmt_iterator I = TheCFG->synthetic_stmt_begin(),
+ E = TheCFG->synthetic_stmt_end();
+ I != E; ++I) {
+ PM.setParent(I->first, PM.getParent(I->second));
+ }
+}
+
+CFG *AnalysisDeclContext::getCFG() {
+ if (!cfgBuildOptions.PruneTriviallyFalseEdges)
+ return getUnoptimizedCFG();
+
+ if (!builtCFG) {
+ cfg.reset(CFG::buildCFG(D, getBody(),
+ &D->getASTContext(), cfgBuildOptions));
+ // Even when the cfg is not successfully built, we don't
+ // want to try building it again.
+ builtCFG = true;
+
+ if (PM)
+ addParentsForSyntheticStmts(cfg.get(), *PM);
+ }
+ return cfg.get();
+}
+
+CFG *AnalysisDeclContext::getUnoptimizedCFG() {
+ if (!builtCompleteCFG) {
+ SaveAndRestore<bool> NotPrune(cfgBuildOptions.PruneTriviallyFalseEdges,
+ false);
+ completeCFG.reset(CFG::buildCFG(D, getBody(), &D->getASTContext(),
+ cfgBuildOptions));
+ // Even when the cfg is not successfully built, we don't
+ // want to try building it again.
+ builtCompleteCFG = true;
+
+ if (PM)
+ addParentsForSyntheticStmts(completeCFG.get(), *PM);
+ }
+ return completeCFG.get();
+}
+
+CFGStmtMap *AnalysisDeclContext::getCFGStmtMap() {
+ if (cfgStmtMap)
+ return cfgStmtMap.get();
+
+ if (CFG *c = getCFG()) {
+ cfgStmtMap.reset(CFGStmtMap::Build(c, &getParentMap()));
+ return cfgStmtMap.get();
+ }
+
+ return 0;
+}
+
+CFGReverseBlockReachabilityAnalysis *AnalysisDeclContext::getCFGReachablityAnalysis() {
+ if (CFA)
+ return CFA.get();
+
+ if (CFG *c = getCFG()) {
+ CFA.reset(new CFGReverseBlockReachabilityAnalysis(*c));
+ return CFA.get();
+ }
+
+ return 0;
+}
+
+void AnalysisDeclContext::dumpCFG(bool ShowColors) {
+ getCFG()->dump(getASTContext().getLangOpts(), ShowColors);
+}
+
+ParentMap &AnalysisDeclContext::getParentMap() {
+ if (!PM) {
+ PM.reset(new ParentMap(getBody()));
+ if (const CXXConstructorDecl *C = dyn_cast<CXXConstructorDecl>(getDecl())) {
+ for (CXXConstructorDecl::init_const_iterator I = C->init_begin(),
+ E = C->init_end();
+ I != E; ++I) {
+ PM->addStmt((*I)->getInit());
+ }
+ }
+ if (builtCFG)
+ addParentsForSyntheticStmts(getCFG(), *PM);
+ if (builtCompleteCFG)
+ addParentsForSyntheticStmts(getUnoptimizedCFG(), *PM);
+ }
+ return *PM;
+}
+
+PseudoConstantAnalysis *AnalysisDeclContext::getPseudoConstantAnalysis() {
+ if (!PCA)
+ PCA.reset(new PseudoConstantAnalysis(getBody()));
+ return PCA.get();
+}
+
+AnalysisDeclContext *AnalysisDeclContextManager::getContext(const Decl *D) {
+ if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
+ // Calling 'hasBody' replaces 'FD' in place with the FunctionDecl
+ // that has the body.
+ FD->hasBody(FD);
+ D = FD;
+ }
+
+ AnalysisDeclContext *&AC = Contexts[D];
+ if (!AC)
+ AC = new AnalysisDeclContext(this, D, cfgBuildOptions);
+ return AC;
+}
+
+const StackFrameContext *
+AnalysisDeclContext::getStackFrame(LocationContext const *Parent, const Stmt *S,
+ const CFGBlock *Blk, unsigned Idx) {
+ return getLocationContextManager().getStackFrame(this, Parent, S, Blk, Idx);
+}
+
+const BlockInvocationContext *
+AnalysisDeclContext::getBlockInvocationContext(const LocationContext *parent,
+ const clang::BlockDecl *BD,
+ const void *ContextData) {
+ return getLocationContextManager().getBlockInvocationContext(this, parent,
+ BD, ContextData);
+}
+
+LocationContextManager & AnalysisDeclContext::getLocationContextManager() {
+ assert(Manager &&
+ "Cannot create LocationContexts without an AnalysisDeclContextManager!");
+ return Manager->getLocationContextManager();
+}
+
+//===----------------------------------------------------------------------===//
+// FoldingSet profiling.
+//===----------------------------------------------------------------------===//
+
+void LocationContext::ProfileCommon(llvm::FoldingSetNodeID &ID,
+ ContextKind ck,
+ AnalysisDeclContext *ctx,
+ const LocationContext *parent,
+ const void *data) {
+ ID.AddInteger(ck);
+ ID.AddPointer(ctx);
+ ID.AddPointer(parent);
+ ID.AddPointer(data);
+}
+
+void StackFrameContext::Profile(llvm::FoldingSetNodeID &ID) {
+ Profile(ID, getAnalysisDeclContext(), getParent(), CallSite, Block, Index);
+}
+
+void ScopeContext::Profile(llvm::FoldingSetNodeID &ID) {
+ Profile(ID, getAnalysisDeclContext(), getParent(), Enter);
+}
+
+void BlockInvocationContext::Profile(llvm::FoldingSetNodeID &ID) {
+ Profile(ID, getAnalysisDeclContext(), getParent(), BD, ContextData);
+}
+
+//===----------------------------------------------------------------------===//
+// LocationContext creation.
+//===----------------------------------------------------------------------===//
+
+template <typename LOC, typename DATA>
+const LOC*
+LocationContextManager::getLocationContext(AnalysisDeclContext *ctx,
+ const LocationContext *parent,
+ const DATA *d) {
+ llvm::FoldingSetNodeID ID;
+ LOC::Profile(ID, ctx, parent, d);
+ void *InsertPos;
+
+ LOC *L = cast_or_null<LOC>(Contexts.FindNodeOrInsertPos(ID, InsertPos));
+
+ if (!L) {
+ L = new LOC(ctx, parent, d);
+ Contexts.InsertNode(L, InsertPos);
+ }
+ return L;
+}
+
+const StackFrameContext*
+LocationContextManager::getStackFrame(AnalysisDeclContext *ctx,
+ const LocationContext *parent,
+ const Stmt *s,
+ const CFGBlock *blk, unsigned idx) {
+ llvm::FoldingSetNodeID ID;
+ StackFrameContext::Profile(ID, ctx, parent, s, blk, idx);
+ void *InsertPos;
+ StackFrameContext *L =
+ cast_or_null<StackFrameContext>(Contexts.FindNodeOrInsertPos(ID, InsertPos));
+ if (!L) {
+ L = new StackFrameContext(ctx, parent, s, blk, idx);
+ Contexts.InsertNode(L, InsertPos);
+ }
+ return L;
+}
+
+const ScopeContext *
+LocationContextManager::getScope(AnalysisDeclContext *ctx,
+ const LocationContext *parent,
+ const Stmt *s) {
+ return getLocationContext<ScopeContext, Stmt>(ctx, parent, s);
+}
+
+const BlockInvocationContext *
+LocationContextManager::getBlockInvocationContext(AnalysisDeclContext *ctx,
+ const LocationContext *parent,
+ const BlockDecl *BD,
+ const void *ContextData) {
+ llvm::FoldingSetNodeID ID;
+ BlockInvocationContext::Profile(ID, ctx, parent, BD, ContextData);
+ void *InsertPos;
+ BlockInvocationContext *L =
+ cast_or_null<BlockInvocationContext>(Contexts.FindNodeOrInsertPos(ID,
+ InsertPos));
+ if (!L) {
+ L = new BlockInvocationContext(ctx, parent, BD, ContextData);
+ Contexts.InsertNode(L, InsertPos);
+ }
+ return L;
+}
+
+//===----------------------------------------------------------------------===//
+// LocationContext methods.
+//===----------------------------------------------------------------------===//
+
+const StackFrameContext *LocationContext::getCurrentStackFrame() const {
+ const LocationContext *LC = this;
+ while (LC) {
+ if (const StackFrameContext *SFC = dyn_cast<StackFrameContext>(LC))
+ return SFC;
+ LC = LC->getParent();
+ }
+ return NULL;
+}
+
+bool LocationContext::inTopFrame() const {
+ return getCurrentStackFrame()->inTopFrame();
+}
+
+bool LocationContext::isParentOf(const LocationContext *LC) const {
+ do {
+ const LocationContext *Parent = LC->getParent();
+ if (Parent == this)
+ return true;
+ else
+ LC = Parent;
+ } while (LC);
+
+ return false;
+}
+
+void LocationContext::dumpStack(raw_ostream &OS, StringRef Indent) const {
+ ASTContext &Ctx = getAnalysisDeclContext()->getASTContext();
+ PrintingPolicy PP(Ctx.getLangOpts());
+ PP.TerseOutput = 1;
+
+ unsigned Frame = 0;
+ for (const LocationContext *LCtx = this; LCtx; LCtx = LCtx->getParent()) {
+ switch (LCtx->getKind()) {
+ case StackFrame:
+ OS << Indent << '#' << Frame++ << ' ';
+ cast<StackFrameContext>(LCtx)->getDecl()->print(OS, PP);
+ OS << '\n';
+ break;
+ case Scope:
+ OS << Indent << " (scope)\n";
+ break;
+ case Block:
+ OS << Indent << " (block context: "
+ << cast<BlockInvocationContext>(LCtx)->getContextData()
+ << ")\n";
+ break;
+ }
+ }
+}
+
+void LocationContext::dumpStack() const {
+ dumpStack(llvm::errs());
+}
+
+//===----------------------------------------------------------------------===//
+// Lazily generated map to query the external variables referenced by a Block.
+//===----------------------------------------------------------------------===//
+
+namespace {
+class FindBlockDeclRefExprsVals : public StmtVisitor<FindBlockDeclRefExprsVals>{
+ BumpVector<const VarDecl*> &BEVals;
+ BumpVectorContext &BC;
+ llvm::SmallPtrSet<const VarDecl*, 4> Visited;
+ llvm::SmallPtrSet<const DeclContext*, 4> IgnoredContexts;
+public:
+ FindBlockDeclRefExprsVals(BumpVector<const VarDecl*> &bevals,
+ BumpVectorContext &bc)
+ : BEVals(bevals), BC(bc) {}
+
+ bool IsTrackedDecl(const VarDecl *VD) {
+ const DeclContext *DC = VD->getDeclContext();
+ return IgnoredContexts.count(DC) == 0;
+ }
+
+ void VisitStmt(Stmt *S) {
+ for (Stmt::child_range I = S->children(); I; ++I)
+ if (Stmt *child = *I)
+ Visit(child);
+ }
+
+ void VisitDeclRefExpr(DeclRefExpr *DR) {
+ // Non-local variables are also directly modified.
+ if (const VarDecl *VD = dyn_cast<VarDecl>(DR->getDecl())) {
+ if (!VD->hasLocalStorage()) {
+ if (Visited.insert(VD))
+ BEVals.push_back(VD, BC);
+ }
+ }
+ }
+
+ void VisitBlockExpr(BlockExpr *BR) {
+ // Blocks containing blocks can transitively capture more variables.
+ IgnoredContexts.insert(BR->getBlockDecl());
+ Visit(BR->getBlockDecl()->getBody());
+ }
+
+ void VisitPseudoObjectExpr(PseudoObjectExpr *PE) {
+ for (PseudoObjectExpr::semantics_iterator it = PE->semantics_begin(),
+ et = PE->semantics_end(); it != et; ++it) {
+ Expr *Semantic = *it;
+ if (OpaqueValueExpr *OVE = dyn_cast<OpaqueValueExpr>(Semantic))
+ Semantic = OVE->getSourceExpr();
+ Visit(Semantic);
+ }
+ }
+};
+} // end anonymous namespace
+
+typedef BumpVector<const VarDecl*> DeclVec;
+
+static DeclVec* LazyInitializeReferencedDecls(const BlockDecl *BD,
+ void *&Vec,
+ llvm::BumpPtrAllocator &A) {
+ if (Vec)
+ return (DeclVec*) Vec;
+
+ BumpVectorContext BC(A);
+ DeclVec *BV = (DeclVec*) A.Allocate<DeclVec>();
+ new (BV) DeclVec(BC, 10);
+
+ // Go through the capture list.
+ for (BlockDecl::capture_const_iterator CI = BD->capture_begin(),
+ CE = BD->capture_end(); CI != CE; ++CI) {
+ BV->push_back(CI->getVariable(), BC);
+ }
+
+ // Find the referenced global/static variables.
+ FindBlockDeclRefExprsVals F(*BV, BC);
+ F.Visit(BD->getBody());
+
+ Vec = BV;
+ return BV;
+}
+
+std::pair<AnalysisDeclContext::referenced_decls_iterator,
+ AnalysisDeclContext::referenced_decls_iterator>
+AnalysisDeclContext::getReferencedBlockVars(const BlockDecl *BD) {
+ if (!ReferencedBlockVars)
+ ReferencedBlockVars = new llvm::DenseMap<const BlockDecl*,void*>();
+
+ DeclVec *V = LazyInitializeReferencedDecls(BD, (*ReferencedBlockVars)[BD], A);
+ return std::make_pair(V->begin(), V->end());
+}
+
+ManagedAnalysis *&AnalysisDeclContext::getAnalysisImpl(const void *tag) {
+ if (!ManagedAnalyses)
+ ManagedAnalyses = new ManagedAnalysisMap();
+ ManagedAnalysisMap *M = (ManagedAnalysisMap*) ManagedAnalyses;
+ return (*M)[tag];
+}
+
+//===----------------------------------------------------------------------===//
+// Cleanup.
+//===----------------------------------------------------------------------===//
+
+ManagedAnalysis::~ManagedAnalysis() {}
+
+AnalysisDeclContext::~AnalysisDeclContext() {
+ delete forcedBlkExprs;
+ delete ReferencedBlockVars;
+ // Release the managed analyses.
+ if (ManagedAnalyses) {
+ ManagedAnalysisMap *M = (ManagedAnalysisMap*) ManagedAnalyses;
+ for (ManagedAnalysisMap::iterator I = M->begin(), E = M->end(); I!=E; ++I)
+ delete I->second;
+ delete M;
+ }
+}
+
+AnalysisDeclContextManager::~AnalysisDeclContextManager() {
+ for (ContextMap::iterator I = Contexts.begin(), E = Contexts.end(); I!=E; ++I)
+ delete I->second;
+}
+
+LocationContext::~LocationContext() {}
+
+LocationContextManager::~LocationContextManager() {
+ clear();
+}
+
+void LocationContextManager::clear() {
+ for (llvm::FoldingSet<LocationContext>::iterator I = Contexts.begin(),
+ E = Contexts.end(); I != E; ) {
+ LocationContext *LC = &*I;
+ ++I;
+ delete LC;
+ }
+
+ Contexts.clear();
+}
+
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