[analyzer] Add test cases for the unsupported C++ constructor modeling.

Namely, for the following items:
- Handle constructors within new[];
- Handle constructors for default arguments.

Update the open projects page with a link to the newly added tests
and more hints for potential contributors.

Patch by Daniel Krupp!

Differential Revision: https://reviews.llvm.org/D69308

1 files changed, 86 insertions, 0 deletions

diff --git a/clang/test/Analysis/handle_constructors_with_new_array.cpp b/clang/test/Analysis/handle_constructors_with_new_array.cpp
new file mode 100644
index 00000000000..61637afce8d
--- /dev/null
+++ b/clang/test/Analysis/handle_constructors_with_new_array.cpp
@@ -0,0 +1,86 @@
+// RUN: %clang_cc1 -fsyntax-only -analyze \
+// RUN:   -analyzer-checker=core,debug.ExprInspection %s -verify
+
+// These test cases demonstrate lack of Static Analyzer features.
+// The FIXME: tags indicate where we expect different output.
+
+// Handle constructors within new[].
+
+// When an array of objects is allocated using the operator new[],
+// constructors for all elements of the array are called.
+// We should model (potentially some of) such evaluations,
+// and the same applies for destructors called from operator delete[].
+
+void clang_analyzer_eval(bool);
+
+struct init_with_list {
+  int a;
+  init_with_list() : a(1) {}
+};
+
+struct init_in_body {
+  int a;
+  init_in_body() { a = 1; }
+};
+
+struct init_default_member {
+  int a = 1;
+};
+
+void test_automatic() {
+
+  init_with_list a1;
+  init_in_body a2;
+  init_default_member a3;
+
+  clang_analyzer_eval(a1.a == 1); // expected-warning {{TRUE}}
+  clang_analyzer_eval(a2.a == 1); // expected-warning {{TRUE}}
+  clang_analyzer_eval(a3.a == 1); // expected-warning {{TRUE}}
+}
+
+void test_dynamic() {
+
+  auto *a1 = new init_with_list;
+  auto *a2 = new init_in_body;
+  auto *a3 = new init_default_member;
+
+  clang_analyzer_eval(a1->a == 1); // expected-warning {{TRUE}}
+  clang_analyzer_eval(a2->a == 1); // expected-warning {{TRUE}}
+  clang_analyzer_eval(a3->a == 1); // expected-warning {{TRUE}}
+
+  delete a1;
+  delete a2;
+  delete a3;
+}
+
+void test_automatic_aggregate() {
+
+  init_with_list a1[1];
+  init_in_body a2[1];
+  init_default_member a3[1];
+
+  // FIXME: Should be TRUE, not FALSE.
+  clang_analyzer_eval(a1[0].a == 1); // expected-warning {{TRUE}} expected-warning {{FALSE}}
+  // FIXME: Should be TRUE, not FALSE.
+  clang_analyzer_eval(a2[0].a == 1); // expected-warning {{TRUE}} expected-warning {{FALSE}}
+  // FIXME: Should be TRUE, not FALSE.
+  clang_analyzer_eval(a3[0].a == 1); // expected-warning {{TRUE}} expected-warning {{FALSE}}
+}
+
+void test_dynamic_aggregate() {
+
+  auto *a1 = new init_with_list[1];
+  auto *a2 = new init_in_body[1];
+  auto *a3 = new init_default_member[1];
+
+  // FIXME: Should be TRUE, not FALSE.
+  clang_analyzer_eval(a1[0].a == 1); // expected-warning {{TRUE}} expected-warning {{FALSE}}
+  // FIXME: Should be TRUE, not FALSE.
+  clang_analyzer_eval(a2[0].a == 1); // expected-warning {{TRUE}} expected-warning {{FALSE}}
+  // FIXME: Should be TRUE, not FALSE.
+  clang_analyzer_eval(a3[0].a == 1); // expected-warning {{TRUE}} expected-warning {{FALSE}}
+
+  delete[] a1;
+  delete[] a2;
+  delete[] a3;
+}