Introduce option -Wargument-larger-than[=N] which warns about function definitions if they take by-value
or return by-value any POD that is larger than some threshold (default is 64 bytes).
Implements rdar://8548050.
llvm-svn: 119583
diff --git a/clang/test/SemaCXX/warn-argument-larger-than.cpp b/clang/test/SemaCXX/warn-argument-larger-than.cpp
new file mode 100644
index 0000000..7a80025
--- /dev/null
+++ b/clang/test/SemaCXX/warn-argument-larger-than.cpp
@@ -0,0 +1,42 @@
+// RUN: %clang_cc1 -verify -fsyntax-only -Wargument-larger-than=100 %s
+
+// rdar://8548050
+namespace rdar8548050 {
+
+struct S100 {
+ char x[100];
+};
+
+struct S101 {
+ char x[101];
+};
+
+S100 f100(S100 s) { return s; }
+
+S101 f101(S101 s) { return s; } // expected-warning {{return value of 'f101' is 101 bytes}} \
+ // expected-warning {{size of 's' is 101 bytes}}
+
+typedef int Arr[200];
+void farr(Arr a) { }
+
+struct NonPOD {
+ char x[200];
+ virtual void m();
+};
+
+NonPOD fNonPOD(NonPOD s) { return s; }
+
+template <unsigned size>
+struct TS {
+ char x[size];
+};
+
+template <unsigned size>
+void tf(TS<size> ts) {} // expected-warning {{size of 'ts' is 300 bytes}}
+
+void g() {
+ TS<300> ts;
+ tf<300>(ts); // expected-note {{instantiation}}
+}
+
+}