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Extend the self move warning to record types. 

Move the logic for checking self moves into SemaChecking and add that function
to Sema since it is now used in multiple places.

llvm-svn: 225756
This commit is contained in:
Richard Trieu 2015-01-13 02:32:02 +00:00
parent b1c217e492
commit 36d0b2b49f
5 changed files with 116 additions and 86 deletions
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4
clang/include/clang/Sema/Sema.h
View File

@ -3326,6 +3326,10 @@ public:
void DiagnoseEmptyLoopBody(const Stmt *S,
const Stmt *PossibleBody);
/// Warn if a value is moved to itself.
void DiagnoseSelfMove(const Expr *LHSExpr, const Expr *RHSExpr,
SourceLocation OpLoc);
ParsingDeclState PushParsingDeclaration(sema::DelayedDiagnosticPool &pool) {
return DelayedDiagnostics.push(pool);
}

90
clang/lib/Sema/SemaChecking.cpp
View File

@ -8325,6 +8325,96 @@ void Sema::DiagnoseEmptyLoopBody(const Stmt *S,
}
}
//===--- CHECK: Warn on self move with std::move. -------------------------===//
/// DiagnoseSelfMove - Emits a warning if a value is moved to itself.
void Sema::DiagnoseSelfMove(const Expr *LHSExpr, const Expr *RHSExpr,
SourceLocation OpLoc) {
if (Diags.isIgnored(diag::warn_sizeof_pointer_expr_memaccess, OpLoc))
return;
if (!ActiveTemplateInstantiations.empty())
return;
// Strip parens and casts away.
LHSExpr = LHSExpr->IgnoreParenImpCasts();
RHSExpr = RHSExpr->IgnoreParenImpCasts();
// Check for a call expression
const CallExpr *CE = dyn_cast<CallExpr>(RHSExpr);
if (!CE || CE->getNumArgs() != 1)
return;
// Check for a call to std::move
const FunctionDecl *FD = CE->getDirectCallee();
if (!FD || !FD->isInStdNamespace() || !FD->getIdentifier() ||
!FD->getIdentifier()->isStr("move"))
return;
// Get argument from std::move
RHSExpr = CE->getArg(0);
const DeclRefExpr *LHSDeclRef = dyn_cast<DeclRefExpr>(LHSExpr);
const DeclRefExpr *RHSDeclRef = dyn_cast<DeclRefExpr>(RHSExpr);
// Two DeclRefExpr's, check that the decls are the same.
if (LHSDeclRef && RHSDeclRef) {
if (!LHSDeclRef->getDecl() || !RHSDeclRef->getDecl())
return;
if (LHSDeclRef->getDecl()->getCanonicalDecl() !=
RHSDeclRef->getDecl()->getCanonicalDecl())
return;
Diag(OpLoc, diag::warn_self_move) << LHSExpr->getType()
<< LHSExpr->getSourceRange()
<< RHSExpr->getSourceRange();
return;
}
// Member variables require a different approach to check for self moves.
// MemberExpr's are the same if every nested MemberExpr refers to the same
// Decl and that the base Expr's are DeclRefExpr's with the same Decl or
// the base Expr's are CXXThisExpr's.
const Expr *LHSBase = LHSExpr;
const Expr *RHSBase = RHSExpr;
const MemberExpr *LHSME = dyn_cast<MemberExpr>(LHSExpr);
const MemberExpr *RHSME = dyn_cast<MemberExpr>(RHSExpr);
if (!LHSME || !RHSME)
return;
while (LHSME && RHSME) {
if (LHSME->getMemberDecl()->getCanonicalDecl() !=
RHSME->getMemberDecl()->getCanonicalDecl())
return;
LHSBase = LHSME->getBase();
RHSBase = RHSME->getBase();
LHSME = dyn_cast<MemberExpr>(LHSBase);
RHSME = dyn_cast<MemberExpr>(RHSBase);
}
LHSDeclRef = dyn_cast<DeclRefExpr>(LHSBase);
RHSDeclRef = dyn_cast<DeclRefExpr>(RHSBase);
if (LHSDeclRef && RHSDeclRef) {
if (!LHSDeclRef->getDecl() || !RHSDeclRef->getDecl())
return;
if (LHSDeclRef->getDecl()->getCanonicalDecl() !=
RHSDeclRef->getDecl()->getCanonicalDecl())
return;
Diag(OpLoc, diag::warn_self_move) << LHSExpr->getType()
<< LHSExpr->getSourceRange()
<< RHSExpr->getSourceRange();
return;
}
if (isa<CXXThisExpr>(LHSBase) && isa<CXXThisExpr>(RHSBase))
Diag(OpLoc, diag::warn_self_move) << LHSExpr->getType()
<< LHSExpr->getSourceRange()
<< RHSExpr->getSourceRange();
}
//===--- Layout compatibility ----------------------------------------------//
namespace {

86
clang/lib/Sema/SemaExpr.cpp
View File

@ -9380,90 +9380,6 @@ static inline UnaryOperatorKind ConvertTokenKindToUnaryOpcode(
return Opc;
}
/// DiagnoseSelfMove - Emits a warning if a value is moved to itself.
static void DiagnoseSelfMove(Sema &S, const Expr *LHSExpr, const Expr *RHSExpr,
SourceLocation OpLoc) {
if (!S.ActiveTemplateInstantiations.empty())
return;
// Strip parens and casts away.
LHSExpr = LHSExpr->IgnoreParenImpCasts();
RHSExpr = RHSExpr->IgnoreParenImpCasts();
// Check for a call expression
const CallExpr *CE = dyn_cast<CallExpr>(RHSExpr);
if (!CE || CE->getNumArgs() != 1)
return;
// Check for a call to std::move
const FunctionDecl *FD = CE->getDirectCallee();
if (!FD || !FD->isInStdNamespace() || !FD->getIdentifier() ||
!FD->getIdentifier()->isStr("move"))
return;
// Get argument from std::move
RHSExpr = CE->getArg(0);
const DeclRefExpr *LHSDeclRef = dyn_cast<DeclRefExpr>(LHSExpr);
const DeclRefExpr *RHSDeclRef = dyn_cast<DeclRefExpr>(RHSExpr);
// Two DeclRefExpr's, check that the decls are the same.
if (LHSDeclRef && RHSDeclRef) {
if (!LHSDeclRef->getDecl() || !RHSDeclRef->getDecl())
return;
if (LHSDeclRef->getDecl()->getCanonicalDecl() !=
RHSDeclRef->getDecl()->getCanonicalDecl())
return;
S.Diag(OpLoc, diag::warn_self_move) << LHSExpr->getType()
<< LHSExpr->getSourceRange()
<< RHSExpr->getSourceRange();
return;
}
// Member variables require a different approach to check for self moves.
// MemberExpr's are the same if every nested MemberExpr refers to the same
// Decl and that the base Expr's are DeclRefExpr's with the same Decl or
// the base Expr's are CXXThisExpr's.
const Expr *LHSBase = LHSExpr;
const Expr *RHSBase = RHSExpr;
const MemberExpr *LHSME = dyn_cast<MemberExpr>(LHSExpr);
const MemberExpr *RHSME = dyn_cast<MemberExpr>(RHSExpr);
if (!LHSME || !RHSME)
return;
while (LHSME && RHSME) {
if (LHSME->getMemberDecl()->getCanonicalDecl() !=
RHSME->getMemberDecl()->getCanonicalDecl())
return;
LHSBase = LHSME->getBase();
RHSBase = RHSME->getBase();
LHSME = dyn_cast<MemberExpr>(LHSBase);
RHSME = dyn_cast<MemberExpr>(RHSBase);
}
LHSDeclRef = dyn_cast<DeclRefExpr>(LHSBase);
RHSDeclRef = dyn_cast<DeclRefExpr>(RHSBase);
if (LHSDeclRef && RHSDeclRef) {
if (!LHSDeclRef->getDecl() || !RHSDeclRef->getDecl())
return;
if (LHSDeclRef->getDecl()->getCanonicalDecl() !=
RHSDeclRef->getDecl()->getCanonicalDecl())
return;
S.Diag(OpLoc, diag::warn_self_move) << LHSExpr->getType()
<< LHSExpr->getSourceRange()
<< RHSExpr->getSourceRange();
return;
}
if (isa<CXXThisExpr>(LHSBase) && isa<CXXThisExpr>(RHSBase))
S.Diag(OpLoc, diag::warn_self_move) << LHSExpr->getType()
<< LHSExpr->getSourceRange()
<< RHSExpr->getSourceRange();
}
/// DiagnoseSelfAssignment - Emits a warning if a value is assigned to itself.
/// This warning is only emitted for builtin assignment operations. It is also
/// suppressed in the event of macro expansions.
@ -9593,7 +9509,7 @@ ExprResult Sema::CreateBuiltinBinOp(SourceLocation OpLoc,
}
if (!ResultTy.isNull()) {
DiagnoseSelfAssignment(*this, LHS.get(), RHS.get(), OpLoc);
DiagnoseSelfMove(*this, LHS.get(), RHS.get(), OpLoc);
DiagnoseSelfMove(LHS.get(), RHS.get(), OpLoc);
}
RecordModifiableNonNullParam(*this, LHS.get());
break;

7
clang/lib/Sema/SemaOverload.cpp
View File

@ -11199,7 +11199,12 @@ Sema::CreateOverloadedBinOp(SourceLocation OpLoc,
// Cut off the implicit 'this'.
if (isa<CXXMethodDecl>(FnDecl))
ArgsArray = ArgsArray.slice(1);
checkCall(FnDecl, ArgsArray, 0, isa<CXXMethodDecl>(FnDecl), OpLoc,
// Check for a self move.
if (Op == OO_Equal)
DiagnoseSelfMove(Args[0], Args[1], OpLoc);
checkCall(FnDecl, ArgsArray, 0, isa<CXXMethodDecl>(FnDecl), OpLoc,
TheCall->getSourceRange(), VariadicDoesNotApply);
return MaybeBindToTemporary(TheCall);

15
clang/test/SemaCXX/warn-self-move.cpp
View File

@ -38,3 +38,18 @@ class field_test {
other.x = std::move(other.x); // expected-warning{{explicitly moving}}
}
};
struct A {};
struct B { A a; };
struct C { C() {}; ~C() {} };
void struct_test() {
A a;
a = std::move(a); // expected-warning{{explicitly moving}}
B b;
b = std::move(b); // expected-warning{{explicitly moving}}
b.a = std::move(b.a); // expected-warning{{explicitly moving}}
C c;
c = std::move(c); // expected-warning{{explicitly moving}}
}