Add the clang library to the repo (with some of my changes, too).

1 files changed, 117 insertions, 0 deletions

diff --git a/clang/test/SemaCXX/warn-bad-memaccess.cpp b/clang/test/SemaCXX/warn-bad-memaccess.cpp
new file mode 100644
index 0000000..3a02c84
--- /dev/null
+++ b/clang/test/SemaCXX/warn-bad-memaccess.cpp
@@ -0,0 +1,117 @@
+// RUN: %clang_cc1 -fsyntax-only -Wdynamic-class-memaccess -verify %s
+
+extern "C" void *memset(void *, int, unsigned);
+extern "C" void *memmove(void *s1, const void *s2, unsigned n);
+extern "C" void *memcpy(void *s1, const void *s2, unsigned n);
+extern "C" void *memcmp(void *s1, const void *s2, unsigned n);
+
+// Several types that should not warn.
+struct S1 {} s1;
+struct S2 { int x; } s2;
+struct S3 { float x, y; S1 s[4]; void (*f)(S1**); } s3;
+
+class C1 {
+  int x, y, z;
+public:
+  void foo() {}
+} c1;
+
+struct X1 { virtual void f(); } x1;
+struct X2 : virtual S1 {} x2;
+
+void test_warn() {
+  memset(&x1, 0, sizeof x1); // \
+      // expected-warning {{destination for this 'memset' call is a pointer to dynamic class}} \
+      // expected-note {{explicitly cast the pointer to silence this warning}}
+  memset(&x2, 0, sizeof x2); // \
+      // expected-warning {{destination for this 'memset' call is a pointer to dynamic class}} \
+      // expected-note {{explicitly cast the pointer to silence this warning}}
+
+  memmove(&x1, 0, sizeof x1); // \
+      // expected-warning{{destination for this 'memmove' call is a pointer to dynamic class 'struct X1'; vtable pointer will be overwritten}} \
+      // expected-note {{explicitly cast the pointer to silence this warning}}
+  memmove(0, &x1, sizeof x1); // \
+      // expected-warning{{source of this 'memmove' call is a pointer to dynamic class 'struct X1'; vtable pointer will be moved}} \
+      // expected-note {{explicitly cast the pointer to silence this warning}}
+  memcpy(&x1, 0, sizeof x1); // \
+      // expected-warning{{destination for this 'memcpy' call is a pointer to dynamic class 'struct X1'; vtable pointer will be overwritten}} \
+      // expected-note {{explicitly cast the pointer to silence this warning}}
+  memcpy(0, &x1, sizeof x1); // \
+      // expected-warning{{source of this 'memcpy' call is a pointer to dynamic class 'struct X1'; vtable pointer will be copied}} \
+      // expected-note {{explicitly cast the pointer to silence this warning}}
+  memcmp(&x1, 0, sizeof x1); // \
+      // expected-warning{{first operand of this 'memcmp' call is a pointer to dynamic class 'struct X1'; vtable pointer will be compared}} \
+      // expected-note {{explicitly cast the pointer to silence this warning}}
+  memcmp(0, &x1, sizeof x1); // \
+      // expected-warning{{second operand of this 'memcmp' call is a pointer to dynamic class 'struct X1'; vtable pointer will be compared}} \
+      // expected-note {{explicitly cast the pointer to silence this warning}}
+
+  __builtin_memset(&x1, 0, sizeof x1); // \
+      // expected-warning {{destination for this '__builtin_memset' call is a pointer to dynamic class}} \
+      // expected-note {{explicitly cast the pointer to silence this warning}}
+  __builtin_memset(&x2, 0, sizeof x2); // \
+      // expected-warning {{destination for this '__builtin_memset' call is a pointer to dynamic class}} \
+      // expected-note {{explicitly cast the pointer to silence this warning}}
+
+  __builtin_memmove(&x1, 0, sizeof x1); // \
+      // expected-warning{{destination for this '__builtin_memmove' call is a pointer to dynamic class}} \
+      // expected-note {{explicitly cast the pointer to silence this warning}}
+  __builtin_memmove(0, &x1, sizeof x1); // \
+      // expected-warning{{source of this '__builtin_memmove' call is a pointer to dynamic class}} \
+      // expected-note {{explicitly cast the pointer to silence this warning}}
+  __builtin_memcpy(&x1, 0, sizeof x1); // \
+      // expected-warning{{destination for this '__builtin_memcpy' call is a pointer to dynamic class}} \
+      // expected-note {{explicitly cast the pointer to silence this warning}}
+  __builtin_memcpy(0, &x1, sizeof x1); // \
+      // expected-warning{{source of this '__builtin_memcpy' call is a pointer to dynamic class}} \
+      // expected-note {{explicitly cast the pointer to silence this warning}}
+
+  __builtin___memset_chk(&x1, 0, sizeof x1, sizeof x1); //                    \
+      // expected-warning {{destination for this '__builtin___memset_chk' call is a pointer to dynamic class}} \
+      // expected-note {{explicitly cast the pointer to silence this warning}}
+  __builtin___memset_chk(&x2, 0, sizeof x2, sizeof x2); //                    \
+      // expected-warning {{destination for this '__builtin___memset_chk' call is a pointer to dynamic class}} \
+      // expected-note {{explicitly cast the pointer to silence this warning}}
+
+  __builtin___memmove_chk(&x1, 0, sizeof x1, sizeof x1); //                   \
+      // expected-warning{{destination for this '__builtin___memmove_chk' call is a pointer to dynamic class}} \
+      // expected-note {{explicitly cast the pointer to silence this warning}}
+  __builtin___memmove_chk(0, &x1, sizeof x1, sizeof x1); //                   \
+      // expected-warning{{source of this '__builtin___memmove_chk' call is a pointer to dynamic class}} \
+      // expected-note {{explicitly cast the pointer to silence this warning}}
+  __builtin___memcpy_chk(&x1, 0, sizeof x1, sizeof x1); //                    \
+      // expected-warning{{destination for this '__builtin___memcpy_chk' call is a pointer to dynamic class}} \
+      // expected-note {{explicitly cast the pointer to silence this warning}}
+  __builtin___memcpy_chk(0, &x1, sizeof x1, sizeof x1); //                    \
+      // expected-warning{{source of this '__builtin___memcpy_chk' call is a pointer to dynamic class}} \
+      // expected-note {{explicitly cast the pointer to silence this warning}}
+}
+
+void test_nowarn(void *void_ptr) {
+  int i, *iptr;
+  float y;
+  char c;
+
+  memset(&i, 0, sizeof i);
+  memset(&iptr, 0, sizeof iptr);
+  memset(&y, 0, sizeof y);
+  memset(&c, 0, sizeof c);
+  memset(void_ptr, 0, 42);
+  memset(&s1, 0, sizeof s1);
+  memset(&s2, 0, sizeof s2);
+  memset(&s3, 0, sizeof s3);
+  memset(&c1, 0, sizeof c1);
+
+  // Unevaluated code shouldn't warn.
+  (void)sizeof memset(&x1, 0, sizeof x1);
+
+  // Dead code shouldn't warn.
+  if (false) memset(&x1, 0, sizeof x1);
+}
+
+namespace N {
+  void *memset(void *, int, unsigned);
+  void test_nowarn() {
+    N::memset(&x1, 0, sizeof x1);
+  }
+}