steven_wu updated this revision to Diff 50186.
steven_wu added a comment.
Update the patch to address John's feedback. We shouldn't even checking
ObjCSubscript but looking at the Semantics for PseudoObjectExpr only.
http://reviews.llvm.org/D17627
Files:
lib/Sema/SemaStmt.cpp
test/SemaObjC/warn-loop-analysis.m
Index: test/SemaObjC/warn-loop-analysis.m
===================================================================
--- /dev/null
+++ test/SemaObjC/warn-loop-analysis.m
@@ -0,0 +1,15 @@
+// RUN: %clang_cc1 -fsyntax-only -Wloop-analysis -verify %s
+// expected-no-diagnostics
+
+@interface MyArray
+- (id)objectAtIndexedSubscript:(unsigned int)idx;
+@end
+
+// Do not warn on objc classes has objectAtIndexedSubscript method.
+MyArray *test;
+void foo()
+{
+ unsigned int i;
+ for (i = 42; i > 0;) // No warnings here
+ (void)test[--i];
+}
Index: lib/Sema/SemaStmt.cpp
===================================================================
--- lib/Sema/SemaStmt.cpp
+++ lib/Sema/SemaStmt.cpp
@@ -1440,6 +1440,19 @@
FoundDecl = true;
}
+ void VisitPseudoObjectExpr(PseudoObjectExpr *POE) {
+ // Only need to visit the semantics for POE.
+ // SyntaticForm doesn't really use the Decal.
+ for (auto *S : POE->semantics()) {
+ if (auto *OVE = dyn_cast<OpaqueValueExpr>(S)) {
+ // Look pass OVE for Decl.
+ if (Expr *E = OVE->getSourceExpr())
+ Visit(E);
+ } else
+ Visit(S);
+ }
+ }
+
bool FoundDeclInUse() { return FoundDecl; }
}; // end class DeclMatcher
Index: test/SemaObjC/warn-loop-analysis.m
===================================================================
--- /dev/null
+++ test/SemaObjC/warn-loop-analysis.m
@@ -0,0 +1,15 @@
+// RUN: %clang_cc1 -fsyntax-only -Wloop-analysis -verify %s
+// expected-no-diagnostics
+
+@interface MyArray
+- (id)objectAtIndexedSubscript:(unsigned int)idx;
+@end
+
+// Do not warn on objc classes has objectAtIndexedSubscript method.
+MyArray *test;
+void foo()
+{
+ unsigned int i;
+ for (i = 42; i > 0;) // No warnings here
+ (void)test[--i];
+}
Index: lib/Sema/SemaStmt.cpp
===================================================================
--- lib/Sema/SemaStmt.cpp
+++ lib/Sema/SemaStmt.cpp
@@ -1440,6 +1440,19 @@
FoundDecl = true;
}
+ void VisitPseudoObjectExpr(PseudoObjectExpr *POE) {
+ // Only need to visit the semantics for POE.
+ // SyntaticForm doesn't really use the Decal.
+ for (auto *S : POE->semantics()) {
+ if (auto *OVE = dyn_cast<OpaqueValueExpr>(S)) {
+ // Look pass OVE for Decl.
+ if (Expr *E = OVE->getSourceExpr())
+ Visit(E);
+ } else
+ Visit(S);
+ }
+ }
+
bool FoundDeclInUse() { return FoundDecl; }
}; // end class DeclMatcher
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