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

1 files changed, 271 insertions, 0 deletions

diff --git a/clang/test/SemaCXX/warn-empty-body.cpp b/clang/test/SemaCXX/warn-empty-body.cpp
new file mode 100644
index 0000000..d643ced
--- /dev/null
+++ b/clang/test/SemaCXX/warn-empty-body.cpp
@@ -0,0 +1,271 @@
+// RUN: %clang_cc1 -std=c++11 -fsyntax-only -verify %s
+
+void a(int i);
+int b();
+int c();
+
+void test1(int x, int y) {
+  while(true) {
+    if (x); // expected-warning {{if statement has empty body}} expected-note{{put the semicolon on a separate line to silence this warning}}
+
+    int i;
+    // PR11329
+    for (i = 0; i < x; i++); { // expected-warning{{for loop has empty body}} expected-note{{put the semicolon on a separate line to silence this warning}}
+      a(i);
+      b();
+    }
+
+    for (i = 0; i < x; i++); // expected-warning{{for loop has empty body}} expected-note{{put the semicolon on a separate line to silence this warning}}
+    {
+      a(i);
+    }
+
+    for (i = 0;
+         i < x;
+         i++); // expected-warning{{for loop has empty body}} expected-note{{put the semicolon on a separate line to silence this warning}}
+    {
+      a(i);
+    }
+
+    int arr[3] = { 1, 2, 3 };
+    for (int j : arr); // expected-warning{{range-based for loop has empty body}} expected-note{{put the semicolon on a separate line to silence this warning}}
+      a(i);
+
+    for (int j :
+         arr); // expected-warning{{range-based for loop has empty body}} expected-note{{put the semicolon on a separate line to silence this warning}}
+      a(i);
+
+    while (b() == 0); // expected-warning{{while loop has empty body}} expected-note{{put the semicolon on a separate line to silence this warning}}
+      a(i);
+
+    while (b() == 0); { // expected-warning{{while loop has empty body}} expected-note{{put the semicolon on a separate line to silence this warning}}
+      a(i);
+    }
+
+    while (b() == 0); // expected-warning{{while loop has empty body}} expected-note{{put the semicolon on a separate line to silence this warning}}
+    {
+      a(i);
+    }
+
+    while (b() == 0 ||
+           c() == 0); // expected-warning{{while loop has empty body}} expected-note{{put the semicolon on a separate line to silence this warning}}
+    {
+      a(i);
+    }
+
+    do;          // expected-note{{to match this 'do'}}
+      b();       // expected-error{{expected 'while' in do/while loop}}
+    while (b()); // no-warning
+    c();
+
+    do;          // expected-note{{to match this 'do'}}
+      b();       // expected-error{{expected 'while' in do/while loop}}
+    while (b()); // expected-warning{{while loop has empty body}} expected-note{{put the semicolon on a separate line to silence this warning}}
+      c();
+
+    switch(x) // no-warning
+    {
+      switch(y); // expected-warning{{switch statement has empty body}} expected-note{{put the semicolon on a separate line to silence this warning}}
+      {
+        case 0:
+          a(10);
+          break;
+        default:
+          a(20);
+          break;
+      }
+    }
+  }
+}
+
+/// There should be no warning  when null statement is placed on its own line.
+void test2(int x, int y) {
+  if (x) // no-warning
+    ; // no-warning
+
+  int i;
+  for (i = 0; i < x; i++) // no-warning
+    ; // no-warning
+
+  for (i = 0;
+       i < x;
+       i++) // no-warning
+    ; // no-warning
+
+  int arr[3] = { 1, 2, 3 };
+  for (int j : arr) // no-warning
+    ; // no-warning
+
+  while (b() == 0) // no-warning
+    ; // no-warning
+
+  while (b() == 0 ||
+         c() == 0) // no-warning
+    ; // no-warning
+
+  switch(x)
+  {
+    switch(y) // no-warning
+      ; // no-warning
+  }
+
+  // Last `for' or `while' statement in compound statement shouldn't warn.
+  while(b() == 0); // no-warning
+}
+
+/// There should be no warning for a null statement resulting from an empty macro.
+#define EMPTY(a)
+void test3(int x, int y) {
+  if (x) EMPTY(x); // no-warning
+
+  int i;
+  for (i = 0; i < x; i++) EMPTY(i); // no-warning
+
+  for (i = 0;
+       i < x;
+       i++) EMPTY(i); // no-warning
+
+  int arr[3] = { 1, 2, 3 };
+  for (int j : arr) EMPTY(j); // no-warning
+
+  for (int j :
+       arr) EMPTY(j); // no-warning
+
+  while (b() == 0) EMPTY(i); // no-warning
+
+  while (b() == 0 ||
+         c() == 0) EMPTY(i); // no-warning
+
+  switch (x) {
+    switch (y)
+      EMPTY(i); // no-warning
+  }
+}
+
+void test4(int x)
+{
+  // Idiom used in some metaprogramming constructs.
+  switch (x) default:; // no-warning
+
+  // Frequent idiom used in macros.
+  do {} while (false); // no-warning
+}
+
+/// There should be no warning for a common for/while idiom when it is obvious
+/// from indentation that next statement wasn't meant to be a body.
+void test5(int x, int y) {
+  int i;
+  for (i = 0; i < x; i++); // expected-warning{{for loop has empty body}} expected-note{{put the semicolon on a separate line to silence this warning}}
+    a(i);
+
+  for (i = 0; i < x; i++); // no-warning
+  a(i);
+
+  for (i = 0;
+       i < x;
+       i++); // expected-warning{{for loop has empty body}} expected-note{{put the semicolon on a separate line to silence this warning}}
+    a(i);
+
+  for (i = 0;
+       i < x;
+       i++); // no-warning
+  a(i);
+
+  while (b() == 0); // expected-warning{{while loop has empty body}} expected-note{{put the semicolon on a separate line to silence this warning}}
+    a(i);
+
+  while (b() == 0); // no-warning
+  a(i);
+
+  while (b() == 0 ||
+         c() == 0); // expected-warning{{while loop has empty body}} expected-note{{put the semicolon on a separate line to silence this warning}}
+    a(i);
+
+  while (b() == 0 ||
+         c() == 0); // no-warning
+  a(i);
+}
+
+/// There should be no warning for a statement with a non-null body.
+void test6(int x, int y) {
+  if (x) {} // no-warning
+
+  if (x)
+    a(x); // no-warning
+
+  int i;
+  for (i = 0; i < x; i++) // no-warning
+    a(i); // no-warning
+
+  for (i = 0; i < x; i++) { // no-warning
+    a(i); // no-warning
+  }
+
+  for (i = 0;
+       i < x;
+       i++) // no-warning
+    a(i); // no-warning
+
+  int arr[3] = { 1, 2, 3 };
+  for (int j : arr) // no-warning
+    a(j);
+
+  for (int j : arr) {} // no-warning
+
+  while (b() == 0) // no-warning
+    a(i); // no-warning
+
+  while (b() == 0) {} // no-warning
+
+  switch(x) // no-warning
+  {
+    switch(y) // no-warning
+    {
+      case 0:
+        a(10);
+        break;
+      default:
+        a(20);
+        break;
+    }
+  }
+}
+
+void test_errors(int x) {
+  if (1)
+    aa; // expected-error{{use of undeclared identifier}}
+        // no empty body warning.
+
+  int i;
+  for (i = 0; i < x; i++)
+    bb; // expected-error{{use of undeclared identifier}}
+
+  int arr[3] = { 1, 2, 3 };
+  for (int j : arr)
+    cc; // expected-error{{use of undeclared identifier}}
+
+  while (b() == 0)
+    dd; // expected-error{{use of undeclared identifier}}
+}
+
+// Warnings for statements in templates shouldn't be duplicated for all
+// instantiations.
+template <typename T>
+void test_template(int x) {
+  if (x); // expected-warning{{if statement has empty body}} expected-note{{put the semicolon on a separate line to silence this warning}}
+
+  if (x)
+    EMPTY(x); // no-warning
+
+  int arr[3] = { 1, 2, 3 };
+  for (int j : arr); // expected-warning{{range-based for loop has empty body}} expected-note{{put the semicolon on a separate line to silence this warning}}
+
+  while (b() == 0); // expected-warning{{while loop has empty body}} expected-note{{put the semicolon on a separate line to silence this warning}}
+    a(x);
+}
+
+void test_template_inst(int x) {
+  test_template<int>(x);
+  test_template<double>(x);
+}
+