Nathan-Huckleberry updated this revision to Diff 211545.
Nathan-Huckleberry added a comment.
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Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D64678/new/
https://reviews.llvm.org/D64678
Files:
clang/lib/Sema/SemaDecl.cpp
clang/test/Sema/warn-uninitialized-statement-expression.c
Index: clang/test/Sema/warn-uninitialized-statement-expression.c
===================================================================
--- /dev/null
+++ clang/test/Sema/warn-uninitialized-statement-expression.c
@@ -0,0 +1,56 @@
+// RUN: %clang_cc1 -fsyntax-only -Wuninitialized -verify %s
+
+void init(int *);
+
+void foo(void) {
+ int i = ({
+ init(&i);
+ i;
+ });
+}
+
+void foo_bad(void) {
+ int i = ({
+ int z = i; // expected-warning{{variable 'i' is uninitialized when used
within its own initialization}}
+ init(&i);
+ i;
+ });
+}
+
+struct widget {
+ int x, y;
+};
+void init2(struct widget *);
+
+void bar(void) {
+ struct widget my_widget = ({
+ init2(&my_widget);
+ my_widget;
+ });
+ struct widget a = (init2(&a), a);
+}
+
+void bar_bad(void) {
+ struct widget my_widget = ({
+ struct widget z = my_widget; // expected-warning{{variable 'my_widget' is
uninitialized when used within its own initialization}}
+ int x = my_widget.x; //FIXME: There should be an uninitialized
warning here
+ init2(&my_widget);
+ my_widget;
+ });
+}
+
+void baz(void) {
+ struct widget a = ({
+ struct widget b = ({
+ b = a; // expected-warning{{variable 'a' is uninitialized when used
within its own initialization}}
+ });
+ a;
+ });
+}
+
+void f(void) {
+ struct widget *a = ({
+ init2(a); // expected-warning{{variable 'a' is uninitialized when used
within its own initialization}}
+ a;
+ });
+}
Index: clang/lib/Sema/SemaDecl.cpp
===================================================================
--- clang/lib/Sema/SemaDecl.cpp
+++ clang/lib/Sema/SemaDecl.cpp
@@ -11255,9 +11255,12 @@
// Check for self-references within variable initializers.
// Variables declared within a function/method body (except for references)
// are handled by a dataflow analysis.
- if (!VDecl->hasLocalStorage() || VDecl->getType()->isRecordType() ||
- VDecl->getType()->isReferenceType()) {
- CheckSelfReference(*this, RealDecl, Init, DirectInit);
+ // This is undefined behavior in C++, but valid in C.
+ if (getLangOpts().CPlusPlus) {
+ if (!VDecl->hasLocalStorage() || VDecl->getType()->isRecordType() ||
+ VDecl->getType()->isReferenceType()) {
+ CheckSelfReference(*this, RealDecl, Init, DirectInit);
+ }
}
// If the type changed, it means we had an incomplete type that was
Index: clang/test/Sema/warn-uninitialized-statement-expression.c
===================================================================
--- /dev/null
+++ clang/test/Sema/warn-uninitialized-statement-expression.c
@@ -0,0 +1,56 @@
+// RUN: %clang_cc1 -fsyntax-only -Wuninitialized -verify %s
+
+void init(int *);
+
+void foo(void) {
+ int i = ({
+ init(&i);
+ i;
+ });
+}
+
+void foo_bad(void) {
+ int i = ({
+ int z = i; // expected-warning{{variable 'i' is uninitialized when used within its own initialization}}
+ init(&i);
+ i;
+ });
+}
+
+struct widget {
+ int x, y;
+};
+void init2(struct widget *);
+
+void bar(void) {
+ struct widget my_widget = ({
+ init2(&my_widget);
+ my_widget;
+ });
+ struct widget a = (init2(&a), a);
+}
+
+void bar_bad(void) {
+ struct widget my_widget = ({
+ struct widget z = my_widget; // expected-warning{{variable 'my_widget' is uninitialized when used within its own initialization}}
+ int x = my_widget.x; //FIXME: There should be an uninitialized warning here
+ init2(&my_widget);
+ my_widget;
+ });
+}
+
+void baz(void) {
+ struct widget a = ({
+ struct widget b = ({
+ b = a; // expected-warning{{variable 'a' is uninitialized when used within its own initialization}}
+ });
+ a;
+ });
+}
+
+void f(void) {
+ struct widget *a = ({
+ init2(a); // expected-warning{{variable 'a' is uninitialized when used within its own initialization}}
+ a;
+ });
+}
Index: clang/lib/Sema/SemaDecl.cpp
===================================================================
--- clang/lib/Sema/SemaDecl.cpp
+++ clang/lib/Sema/SemaDecl.cpp
@@ -11255,9 +11255,12 @@
// Check for self-references within variable initializers.
// Variables declared within a function/method body (except for references)
// are handled by a dataflow analysis.
- if (!VDecl->hasLocalStorage() || VDecl->getType()->isRecordType() ||
- VDecl->getType()->isReferenceType()) {
- CheckSelfReference(*this, RealDecl, Init, DirectInit);
+ // This is undefined behavior in C++, but valid in C.
+ if (getLangOpts().CPlusPlus) {
+ if (!VDecl->hasLocalStorage() || VDecl->getType()->isRecordType() ||
+ VDecl->getType()->isReferenceType()) {
+ CheckSelfReference(*this, RealDecl, Init, DirectInit);
+ }
}
// If the type changed, it means we had an incomplete type that was
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