Pull ScopeInfo implementation into its own file.
The infrastructure for -Warc-repeated-use-of-weak got a little too heavy
to leave sitting at the top of Sema.cpp.
No functionality change.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@164856 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Sema/ScopeInfo.cpp b/lib/Sema/ScopeInfo.cpp
new file mode 100644
index 0000000..bb9420d
--- /dev/null
+++ b/lib/Sema/ScopeInfo.cpp
@@ -0,0 +1,181 @@
+//===--- ScopeInfo.cpp - Information about a semantic context -------------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements FunctionScopeInfo and its subclasses, which contain
+// information about a single function, block, lambda, or method body.
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/Sema/ScopeInfo.h"
+#include "clang/AST/Decl.h"
+#include "clang/AST/DeclObjC.h"
+#include "clang/AST/Expr.h"
+#include "clang/AST/ExprCXX.h"
+#include "clang/AST/ExprObjC.h"
+
+using namespace clang;
+using namespace sema;
+
+void FunctionScopeInfo::Clear() {
+ HasBranchProtectedScope = false;
+ HasBranchIntoScope = false;
+ HasIndirectGoto = false;
+
+ SwitchStack.clear();
+ Returns.clear();
+ ErrorTrap.reset();
+ PossiblyUnreachableDiags.clear();
+ WeakObjectUses.clear();
+}
+
+static const NamedDecl *getBestPropertyDecl(const ObjCPropertyRefExpr *PropE) {
+ if (PropE->isExplicitProperty())
+ return PropE->getExplicitProperty();
+
+ return PropE->getImplicitPropertyGetter();
+}
+
+static bool isSelfExpr(const Expr *E) {
+ E = E->IgnoreParenImpCasts();
+
+ const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E);
+ if (!DRE)
+ return false;
+
+ const ImplicitParamDecl *Param = dyn_cast<ImplicitParamDecl>(DRE->getDecl());
+ if (!Param)
+ return false;
+
+ const ObjCMethodDecl *M = dyn_cast<ObjCMethodDecl>(Param->getDeclContext());
+ if (!M)
+ return false;
+
+ return M->getSelfDecl() == Param;
+}
+
+FunctionScopeInfo::WeakObjectProfileTy::BaseInfoTy
+FunctionScopeInfo::WeakObjectProfileTy::getBaseInfo(const Expr *E) {
+ E = E->IgnoreParenCasts();
+
+ const NamedDecl *D = 0;
+ bool IsExact = false;
+
+ switch (E->getStmtClass()) {
+ case Stmt::DeclRefExprClass:
+ D = cast<DeclRefExpr>(E)->getDecl();
+ IsExact = isa<VarDecl>(D);
+ break;
+ case Stmt::MemberExprClass: {
+ const MemberExpr *ME = cast<MemberExpr>(E);
+ D = ME->getMemberDecl();
+ IsExact = isa<CXXThisExpr>(ME->getBase()->IgnoreParenImpCasts());
+ break;
+ }
+ case Stmt::ObjCIvarRefExprClass: {
+ const ObjCIvarRefExpr *IE = cast<ObjCIvarRefExpr>(E);
+ D = IE->getDecl();
+ IsExact = isSelfExpr(IE->getBase());
+ break;
+ }
+ case Stmt::PseudoObjectExprClass: {
+ const PseudoObjectExpr *POE = cast<PseudoObjectExpr>(E);
+ const ObjCPropertyRefExpr *BaseProp =
+ dyn_cast<ObjCPropertyRefExpr>(POE->getSyntacticForm());
+ if (BaseProp) {
+ D = getBestPropertyDecl(BaseProp);
+
+ const Expr *DoubleBase = BaseProp->getBase();
+ if (const OpaqueValueExpr *OVE = dyn_cast<OpaqueValueExpr>(DoubleBase))
+ DoubleBase = OVE->getSourceExpr();
+
+ IsExact = isSelfExpr(DoubleBase);
+ }
+ break;
+ }
+ default:
+ break;
+ }
+
+ return BaseInfoTy(D, IsExact);
+}
+
+
+FunctionScopeInfo::WeakObjectProfileTy::WeakObjectProfileTy(
+ const ObjCPropertyRefExpr *PropE)
+ : Base(0, true), Property(getBestPropertyDecl(PropE)) {
+
+ if (PropE->isObjectReceiver()) {
+ const OpaqueValueExpr *OVE = cast<OpaqueValueExpr>(PropE->getBase());
+ const Expr *E = OVE->getSourceExpr();
+ Base = getBaseInfo(E);
+ } else if (PropE->isClassReceiver()) {
+ Base.setPointer(PropE->getClassReceiver());
+ } else {
+ assert(PropE->isSuperReceiver());
+ }
+}
+
+FunctionScopeInfo::WeakObjectProfileTy::WeakObjectProfileTy(
+ const DeclRefExpr *DRE)
+ : Base(0, true), Property(DRE->getDecl()) {
+ assert(isa<VarDecl>(Property));
+}
+
+FunctionScopeInfo::WeakObjectProfileTy::WeakObjectProfileTy(
+ const ObjCIvarRefExpr *IvarE)
+ : Base(getBaseInfo(IvarE->getBase())), Property(IvarE->getDecl()) {
+}
+
+void FunctionScopeInfo::markSafeWeakUse(const Expr *E) {
+ E = E->IgnoreParenImpCasts();
+
+ if (const PseudoObjectExpr *POE = dyn_cast<PseudoObjectExpr>(E)) {
+ markSafeWeakUse(POE->getSyntacticForm());
+ return;
+ }
+
+ if (const ConditionalOperator *Cond = dyn_cast<ConditionalOperator>(E)) {
+ markSafeWeakUse(Cond->getTrueExpr());
+ markSafeWeakUse(Cond->getFalseExpr());
+ return;
+ }
+
+ if (const BinaryConditionalOperator *Cond =
+ dyn_cast<BinaryConditionalOperator>(E)) {
+ markSafeWeakUse(Cond->getCommon());
+ markSafeWeakUse(Cond->getFalseExpr());
+ return;
+ }
+
+ // Has this weak object been seen before?
+ FunctionScopeInfo::WeakObjectUseMap::iterator Uses;
+ if (const ObjCPropertyRefExpr *RefExpr = dyn_cast<ObjCPropertyRefExpr>(E))
+ Uses = WeakObjectUses.find(FunctionScopeInfo::WeakObjectProfileTy(RefExpr));
+ else if (const ObjCIvarRefExpr *IvarE = dyn_cast<ObjCIvarRefExpr>(E))
+ Uses = WeakObjectUses.find(FunctionScopeInfo::WeakObjectProfileTy(IvarE));
+ else if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E))
+ Uses = WeakObjectUses.find(FunctionScopeInfo::WeakObjectProfileTy(DRE));
+ else
+ return;
+
+ if (Uses == WeakObjectUses.end())
+ return;
+
+ // Has there been a read from the object using this Expr?
+ FunctionScopeInfo::WeakUseVector::reverse_iterator ThisUse =
+ std::find(Uses->second.rbegin(), Uses->second.rend(), WeakUseTy(E, true));
+ if (ThisUse == Uses->second.rend())
+ return;
+
+ ThisUse->markSafe();
+}
+
+FunctionScopeInfo::~FunctionScopeInfo() { }
+BlockScopeInfo::~BlockScopeInfo() { }
+LambdaScopeInfo::~LambdaScopeInfo() { }