[clang] fbf915f - Add a FIXME and corresponding test coverage for some suspicious behavior
Richard Smith via cfe-commits
cfe-commits at lists.llvm.org
Fri Jan 10 16:12:25 PST 2020
Author: Richard Smith
Date: 2020-01-10T16:12:00-08:00
New Revision: fbf915f01d46e005146f01553a5d7c6619d19597
URL: https://github.com/llvm/llvm-project/commit/fbf915f01d46e005146f01553a5d7c6619d19597
DIFF: https://github.com/llvm/llvm-project/commit/fbf915f01d46e005146f01553a5d7c6619d19597.diff
LOG: Add a FIXME and corresponding test coverage for some suspicious behavior
forming composite ObjC pointer types in comparisons.
Added:
Modified:
clang/lib/Sema/SemaExpr.cpp
clang/test/SemaObjC/arc.m
clang/test/SemaObjCXX/arc-ptr-comparison.mm
Removed:
################################################################################
diff --git a/clang/lib/Sema/SemaExpr.cpp b/clang/lib/Sema/SemaExpr.cpp
index 51b1ebe0b17f..5f4071924d3f 100644
--- a/clang/lib/Sema/SemaExpr.cpp
+++ b/clang/lib/Sema/SemaExpr.cpp
@@ -11055,6 +11055,9 @@ QualType Sema::CheckCompareOperands(ExprResult &LHS, ExprResult &RHS,
diagnoseDistinctPointerComparison(*this, Loc, LHS, RHS,
/*isError*/false);
}
+ // FIXME: If LPtrToVoid, we should presumably convert the LHS rather than
+ // the RHS, but we have test coverage for this behavior.
+ // FIXME: Consider using convertPointersToCompositeType in C++.
if (LHSIsNull && !RHSIsNull) {
Expr *E = LHS.get();
if (getLangOpts().ObjCAutoRefCount)
diff --git a/clang/test/SemaObjC/arc.m b/clang/test/SemaObjC/arc.m
index b87f294eef53..dea3ba5e9b79 100644
--- a/clang/test/SemaObjC/arc.m
+++ b/clang/test/SemaObjC/arc.m
@@ -295,6 +295,7 @@ void test11(id op, void *vp) {
b = (vp == nil);
b = (nil == vp);
+ // FIXME: Shouldn't these be consistent?
b = (vp == op); // expected-error {{implicit conversion of Objective-C pointer type 'id' to C pointer type 'void *' requires a bridged cast}} expected-note {{use __bridge}} expected-note {{use CFBridgingRetain call}}
b = (op == vp);
}
diff --git a/clang/test/SemaObjCXX/arc-ptr-comparison.mm b/clang/test/SemaObjCXX/arc-ptr-comparison.mm
index 8571a8179598..b3af26c1f847 100644
--- a/clang/test/SemaObjCXX/arc-ptr-comparison.mm
+++ b/clang/test/SemaObjCXX/arc-ptr-comparison.mm
@@ -22,3 +22,32 @@ int testObjCComparisonRules(void *v, id x, id y) {
return v == (void *)0;
return x == y;
}
+
+ at class A;
+
+int testMixedQualComparisonRules(void *v, const void *cv, A *a, const A *ca) {
+ return cv == ca;
+#ifndef NOARC
+// expected-error at -2 {{implicit conversion of Objective-C pointer type 'const A *' to C pointer type 'const void *' requires a bridged cast}}
+// expected-note at -3 {{use __bridge to convert directly (no change in ownership)}}
+// expected-note at -4 {{use __bridge_retained to make an ARC object available as a +1 'const void *'}}
+#endif
+ // FIXME: The "to" type in this diagnostic is wrong; we should convert to "const void *".
+ return v == ca;
+#ifndef NOARC
+// expected-error at -2 {{implicit conversion of Objective-C pointer type 'const A *' to C pointer type 'void *' requires a bridged cast}}
+// expected-note at -3 {{use __bridge to convert directly (no change in ownership)}}
+// expected-note at -4 {{use __bridge_retained to make an ARC object available as a +1 'void *'}}
+#endif
+ return cv == a;
+#ifndef NOARC
+// expected-error at -2 {{implicit conversion of Objective-C pointer type 'A *' to C pointer type 'const void *' requires a bridged cast}}
+// expected-note at -3 {{use __bridge to convert directly (no change in ownership)}}
+// expected-note at -4 {{use __bridge_retained to make an ARC object available as a +1 'const void *'}}
+#endif
+
+ // FIXME: Shouldn't these be rejected in ARC mode too?
+ return ca == cv;
+ return a == cv;
+ return ca == v;
+}
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