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fix some crashes in unusedfields plugin

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for some reason the insideMoveOrCopyDecl pointer to MethodDecl becomes
bad during AST traversal, but the pointers to RecordDecl seem stable?

Change-Id: Ida939f5ca4780e674b245411f7395f147258544e
This commit is contained in:
Noel Grandin
2017-06-29 13:40:11 +02:00
parent fb37189e84
commit acd8f0c344
1 changed files with 26 additions and 24 deletions
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50
compilerplugins/clang/unusedfields.cxx
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@@ -84,8 +84,9 @@ public:
bool TraverseCXXMethodDecl( CXXMethodDecl* );
private:
MyFieldInfo niceName(const FieldDecl*);
void checkTouched(const FieldDecl* fieldDecl, const Expr* memberExpr);
CXXMethodDecl * insideMoveOrCopyDecl;
void checkTouchedFromOutside(const FieldDecl* fieldDecl, const Expr* memberExpr);
void checkWriteOnly(const FieldDecl* fieldDecl, const Expr* memberExpr);
RecordDecl * insideMoveOrCopyDeclParent;
};
void UnusedFields::run()
@@ -200,19 +201,21 @@ bool startswith(const std::string& rStr, const char* pSubStr)
bool UnusedFields::TraverseCXXConstructorDecl(CXXConstructorDecl* cxxConstructorDecl)
{
if (cxxConstructorDecl->isCopyOrMoveConstructor())
insideMoveOrCopyDecl = cxxConstructorDecl;
if (!ignoreLocation(cxxConstructorDecl)
&& cxxConstructorDecl->isCopyOrMoveConstructor())
insideMoveOrCopyDeclParent = cxxConstructorDecl->getParent();
bool ret = RecursiveASTVisitor::TraverseCXXConstructorDecl(cxxConstructorDecl);
insideMoveOrCopyDecl = nullptr;
insideMoveOrCopyDeclParent = nullptr;
return ret;
}
bool UnusedFields::TraverseCXXMethodDecl(CXXMethodDecl* cxxMethodDecl)
{
if (cxxMethodDecl->isCopyAssignmentOperator() || cxxMethodDecl->isMoveAssignmentOperator())
insideMoveOrCopyDecl = cxxMethodDecl;
if (!ignoreLocation(cxxMethodDecl)
&& (cxxMethodDecl->isCopyAssignmentOperator() || cxxMethodDecl->isMoveAssignmentOperator()))
insideMoveOrCopyDeclParent = cxxMethodDecl->getParent();
bool ret = RecursiveASTVisitor::TraverseCXXMethodDecl(cxxMethodDecl);
insideMoveOrCopyDecl = nullptr;
insideMoveOrCopyDeclParent = nullptr;
return ret;
}
@@ -232,21 +235,21 @@ bool UnusedFields::VisitMemberExpr( const MemberExpr* memberExpr )
return true;
}
MyFieldInfo fieldInfo = niceName(fieldDecl);
checkTouchedFromOutside(fieldDecl, memberExpr);
// for the touched-from-outside analysis
checkWriteOnly(fieldDecl, memberExpr);
checkTouched(fieldDecl, memberExpr);
return true;
}
// for the write-only analysis
// we don't care about reads from a field when inside that field parent class copy/move constructor/operator=
if (insideMoveOrCopyDecl)
void UnusedFields::checkWriteOnly(const FieldDecl* fieldDecl, const Expr* memberExpr)
{
// we don't care about reads from a field when inside the copy/move constructor/operator= for that field
if (insideMoveOrCopyDeclParent)
{
auto cxxRecordDecl1 = dyn_cast<CXXRecordDecl>(fieldDecl->getDeclContext());
auto cxxRecordDecl2 = dyn_cast<CXXRecordDecl>(insideMoveOrCopyDecl->getDeclContext());
if (cxxRecordDecl1 && cxxRecordDecl1 == cxxRecordDecl2)
return true;
RecordDecl const * cxxRecordDecl1 = fieldDecl->getParent();
if (cxxRecordDecl1 && (cxxRecordDecl1 == insideMoveOrCopyDeclParent))
return;
}
auto parentsRange = compiler.getASTContext().getParents(*memberExpr);
@@ -268,7 +271,7 @@ bool UnusedFields::VisitMemberExpr( const MemberExpr* memberExpr )
bPotentiallyReadFrom = true;
}
if (!bPotentiallyReadFrom)
return true;
return;
break;
}
if (isa<CastExpr>(parent) || isa<MemberExpr>(parent) || isa<ParenExpr>(parent) || isa<ParenListExpr>(parent)
@@ -404,10 +407,9 @@ bool UnusedFields::VisitMemberExpr( const MemberExpr* memberExpr )
memberExpr->dump();
}
MyFieldInfo fieldInfo = niceName(fieldDecl);
if (bPotentiallyReadFrom)
readFromSet.insert(fieldInfo);
return true;
}
bool UnusedFields::VisitDeclRefExpr( const DeclRefExpr* declRefExpr )
@@ -425,11 +427,11 @@ bool UnusedFields::VisitDeclRefExpr( const DeclRefExpr* declRefExpr )
if (isInUnoIncludeFile(compiler.getSourceManager().getSpellingLoc(fieldDecl->getLocation()))) {
return true;
}
checkTouched(fieldDecl, declRefExpr);
checkTouchedFromOutside(fieldDecl, declRefExpr);
return true;
}
void UnusedFields::checkTouched(const FieldDecl* fieldDecl, const Expr* memberExpr) {
void UnusedFields::checkTouchedFromOutside(const FieldDecl* fieldDecl, const Expr* memberExpr) {
const FunctionDecl* memberExprParentFunction = parentFunctionDecl(memberExpr);
const CXXMethodDecl* methodDecl = dyn_cast_or_null<CXXMethodDecl>(memberExprParentFunction);