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https://github.com/capstone-engine/llvm-capstone.git
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e71759103e
This check does not apply when Borland extensions are enabled, as they have a checked in test case indicating that mixed usage of SEH and C++ is supported. llvm-svn: 227876
239 lines
7.6 KiB
C++
239 lines
7.6 KiB
C++
//===--- ScopeInfo.cpp - Information about a semantic context -------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements FunctionScopeInfo and its subclasses, which contain
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// information about a single function, block, lambda, or method body.
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//
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//===----------------------------------------------------------------------===//
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#include "clang/Sema/ScopeInfo.h"
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#include "clang/AST/Decl.h"
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#include "clang/AST/DeclCXX.h"
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#include "clang/AST/DeclObjC.h"
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#include "clang/AST/Expr.h"
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#include "clang/AST/ExprCXX.h"
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#include "clang/AST/ExprObjC.h"
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using namespace clang;
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using namespace sema;
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void FunctionScopeInfo::Clear() {
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HasBranchProtectedScope = false;
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HasBranchIntoScope = false;
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HasIndirectGoto = false;
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HasDroppedStmt = false;
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ObjCShouldCallSuper = false;
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ObjCIsDesignatedInit = false;
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ObjCWarnForNoDesignatedInitChain = false;
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ObjCIsSecondaryInit = false;
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ObjCWarnForNoInitDelegation = false;
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FirstCXXTryLoc = SourceLocation();
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FirstSEHTryLoc = SourceLocation();
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SwitchStack.clear();
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Returns.clear();
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ErrorTrap.reset();
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PossiblyUnreachableDiags.clear();
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WeakObjectUses.clear();
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ModifiedNonNullParams.clear();
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}
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static const NamedDecl *getBestPropertyDecl(const ObjCPropertyRefExpr *PropE) {
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if (PropE->isExplicitProperty())
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return PropE->getExplicitProperty();
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return PropE->getImplicitPropertyGetter();
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}
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FunctionScopeInfo::WeakObjectProfileTy::BaseInfoTy
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FunctionScopeInfo::WeakObjectProfileTy::getBaseInfo(const Expr *E) {
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E = E->IgnoreParenCasts();
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const NamedDecl *D = nullptr;
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bool IsExact = false;
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switch (E->getStmtClass()) {
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case Stmt::DeclRefExprClass:
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D = cast<DeclRefExpr>(E)->getDecl();
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IsExact = isa<VarDecl>(D);
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break;
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case Stmt::MemberExprClass: {
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const MemberExpr *ME = cast<MemberExpr>(E);
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D = ME->getMemberDecl();
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IsExact = isa<CXXThisExpr>(ME->getBase()->IgnoreParenImpCasts());
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break;
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}
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case Stmt::ObjCIvarRefExprClass: {
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const ObjCIvarRefExpr *IE = cast<ObjCIvarRefExpr>(E);
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D = IE->getDecl();
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IsExact = IE->getBase()->isObjCSelfExpr();
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break;
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}
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case Stmt::PseudoObjectExprClass: {
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const PseudoObjectExpr *POE = cast<PseudoObjectExpr>(E);
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const ObjCPropertyRefExpr *BaseProp =
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dyn_cast<ObjCPropertyRefExpr>(POE->getSyntacticForm());
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if (BaseProp) {
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D = getBestPropertyDecl(BaseProp);
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const Expr *DoubleBase = BaseProp->getBase();
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if (const OpaqueValueExpr *OVE = dyn_cast<OpaqueValueExpr>(DoubleBase))
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DoubleBase = OVE->getSourceExpr();
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IsExact = DoubleBase->isObjCSelfExpr();
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}
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break;
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}
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default:
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break;
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}
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return BaseInfoTy(D, IsExact);
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}
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bool CapturingScopeInfo::isVLATypeCaptured(const VariableArrayType *VAT) const {
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RecordDecl *RD = nullptr;
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if (auto *LSI = dyn_cast<LambdaScopeInfo>(this))
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RD = LSI->Lambda;
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else if (auto CRSI = dyn_cast<CapturedRegionScopeInfo>(this))
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RD = CRSI->TheRecordDecl;
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if (RD)
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for (auto *FD : RD->fields()) {
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if (FD->hasCapturedVLAType() && FD->getCapturedVLAType() == VAT)
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return true;
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}
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return false;
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}
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FunctionScopeInfo::WeakObjectProfileTy::WeakObjectProfileTy(
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const ObjCPropertyRefExpr *PropE)
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: Base(nullptr, true), Property(getBestPropertyDecl(PropE)) {
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if (PropE->isObjectReceiver()) {
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const OpaqueValueExpr *OVE = cast<OpaqueValueExpr>(PropE->getBase());
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const Expr *E = OVE->getSourceExpr();
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Base = getBaseInfo(E);
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} else if (PropE->isClassReceiver()) {
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Base.setPointer(PropE->getClassReceiver());
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} else {
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assert(PropE->isSuperReceiver());
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}
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}
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FunctionScopeInfo::WeakObjectProfileTy::WeakObjectProfileTy(const Expr *BaseE,
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const ObjCPropertyDecl *Prop)
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: Base(nullptr, true), Property(Prop) {
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if (BaseE)
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Base = getBaseInfo(BaseE);
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// else, this is a message accessing a property on super.
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}
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FunctionScopeInfo::WeakObjectProfileTy::WeakObjectProfileTy(
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const DeclRefExpr *DRE)
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: Base(nullptr, true), Property(DRE->getDecl()) {
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assert(isa<VarDecl>(Property));
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}
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FunctionScopeInfo::WeakObjectProfileTy::WeakObjectProfileTy(
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const ObjCIvarRefExpr *IvarE)
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: Base(getBaseInfo(IvarE->getBase())), Property(IvarE->getDecl()) {
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}
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void FunctionScopeInfo::recordUseOfWeak(const ObjCMessageExpr *Msg,
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const ObjCPropertyDecl *Prop) {
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assert(Msg && Prop);
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WeakUseVector &Uses =
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WeakObjectUses[WeakObjectProfileTy(Msg->getInstanceReceiver(), Prop)];
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Uses.push_back(WeakUseTy(Msg, Msg->getNumArgs() == 0));
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}
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void FunctionScopeInfo::markSafeWeakUse(const Expr *E) {
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E = E->IgnoreParenCasts();
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if (const PseudoObjectExpr *POE = dyn_cast<PseudoObjectExpr>(E)) {
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markSafeWeakUse(POE->getSyntacticForm());
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return;
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}
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if (const ConditionalOperator *Cond = dyn_cast<ConditionalOperator>(E)) {
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markSafeWeakUse(Cond->getTrueExpr());
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markSafeWeakUse(Cond->getFalseExpr());
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return;
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}
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if (const BinaryConditionalOperator *Cond =
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dyn_cast<BinaryConditionalOperator>(E)) {
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markSafeWeakUse(Cond->getCommon());
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markSafeWeakUse(Cond->getFalseExpr());
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return;
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}
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// Has this weak object been seen before?
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FunctionScopeInfo::WeakObjectUseMap::iterator Uses;
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if (const ObjCPropertyRefExpr *RefExpr = dyn_cast<ObjCPropertyRefExpr>(E)) {
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if (!RefExpr->isObjectReceiver())
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return;
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if (isa<OpaqueValueExpr>(RefExpr->getBase()))
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Uses = WeakObjectUses.find(WeakObjectProfileTy(RefExpr));
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else {
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markSafeWeakUse(RefExpr->getBase());
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return;
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}
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}
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else if (const ObjCIvarRefExpr *IvarE = dyn_cast<ObjCIvarRefExpr>(E))
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Uses = WeakObjectUses.find(WeakObjectProfileTy(IvarE));
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else if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E))
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Uses = WeakObjectUses.find(WeakObjectProfileTy(DRE));
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else if (const ObjCMessageExpr *MsgE = dyn_cast<ObjCMessageExpr>(E)) {
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Uses = WeakObjectUses.end();
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if (const ObjCMethodDecl *MD = MsgE->getMethodDecl()) {
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if (const ObjCPropertyDecl *Prop = MD->findPropertyDecl()) {
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Uses =
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WeakObjectUses.find(WeakObjectProfileTy(MsgE->getInstanceReceiver(),
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Prop));
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}
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}
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}
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else
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return;
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if (Uses == WeakObjectUses.end())
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return;
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// Has there been a read from the object using this Expr?
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FunctionScopeInfo::WeakUseVector::reverse_iterator ThisUse =
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std::find(Uses->second.rbegin(), Uses->second.rend(), WeakUseTy(E, true));
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if (ThisUse == Uses->second.rend())
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return;
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ThisUse->markSafe();
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}
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void LambdaScopeInfo::getPotentialVariableCapture(unsigned Idx, VarDecl *&VD,
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Expr *&E) const {
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assert(Idx < getNumPotentialVariableCaptures() &&
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"Index of potential capture must be within 0 to less than the "
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"number of captures!");
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E = PotentiallyCapturingExprs[Idx];
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if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E))
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VD = dyn_cast<VarDecl>(DRE->getFoundDecl());
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else if (MemberExpr *ME = dyn_cast<MemberExpr>(E))
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VD = dyn_cast<VarDecl>(ME->getMemberDecl());
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else
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llvm_unreachable("Only DeclRefExprs or MemberExprs should be added for "
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"potential captures");
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assert(VD);
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}
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FunctionScopeInfo::~FunctionScopeInfo() { }
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BlockScopeInfo::~BlockScopeInfo() { }
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LambdaScopeInfo::~LambdaScopeInfo() { }
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CapturedRegionScopeInfo::~CapturedRegionScopeInfo() { }
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