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

1 files changed, 134 insertions, 0 deletions

diff --git a/clang/test/Sema/warn-unreachable.c b/clang/test/Sema/warn-unreachable.c
new file mode 100644
index 0000000..636513f
--- /dev/null
+++ b/clang/test/Sema/warn-unreachable.c
@@ -0,0 +1,134 @@
+// RUN: %clang %s -fsyntax-only -Xclang -verify -fblocks -Wunreachable-code -Wno-unused-value -Wno-covered-switch-default
+
+int halt() __attribute__((noreturn));
+int live();
+int dead();
+
+void test1() {
+  goto c;
+  d:
+  goto e;       // expected-warning {{will never be executed}}
+  c: ;
+  int i;
+  return;
+  goto b;        // expected-warning {{will never be executed}}
+  goto a;        // expected-warning {{will never be executed}}
+  b:
+  i = 1;
+  a:
+  i = 2;
+  goto f;
+  e:
+  goto d;
+  f: ;
+}
+
+void test2() {
+  int i;
+  switch (live()) {
+  case 1:
+    halt(),
+      dead();   // expected-warning {{will never be executed}}
+
+  case 2:
+    live(), halt(),
+      dead();   // expected-warning {{will never be executed}}
+
+  case 3:
+  live()
+    +           // expected-warning {{will never be executed}}
+    halt();
+  dead();
+
+  case 4:
+  a4:
+    live(),
+      halt();
+    goto a4;    // expected-warning {{will never be executed}}
+
+  case 5:
+    goto a5;
+  c5:
+    dead();     // expected-warning {{will never be executed}}
+    goto b5;
+  a5:
+    live(),
+      halt();
+  b5:
+    goto c5;
+
+  case 6:
+    if (live())
+      goto e6;
+    live(),
+      halt();
+  d6:
+    dead();     // expected-warning {{will never be executed}}
+    goto b6;
+  c6:
+    dead();
+    goto b6;
+  e6:
+    live(),
+      halt();
+  b6:
+    goto c6;
+  case 7:
+    halt()
+      +
+      dead();   // expected-warning {{will never be executed}}
+    -           // expected-warning {{will never be executed}}
+      halt();
+  case 8:
+    i           // expected-warning {{will never be executed}}
+      +=
+      halt();
+  case 9:
+    halt()
+      ?         // expected-warning {{will never be executed}}
+      dead() : dead();
+  case 10:
+    (           // expected-warning {{will never be executed}}
+      float)halt();
+  case 11: {
+    int a[5];
+    live(),
+      a[halt()  // expected-warning {{will never be executed}}
+        ];
+  }
+  }
+}
+
+enum Cases { C1, C2, C3 };
+int test_enum_cases(enum Cases C) {
+  switch (C) {
+    case C1:
+    case C2:
+    case C3:
+      return 1;
+    default: {
+      int i = 0; // expected-warning{{will never be executed}}
+      ++i;
+      return i;
+    }
+  }  
+}
+
+// Handle unreachable code triggered by macro expansions.
+void __myassert_rtn(const char *, const char *, int, const char *) __attribute__((__noreturn__));
+
+#define myassert(e) \
+    (__builtin_expect(!(e), 0) ? __myassert_rtn(__func__, __FILE__, __LINE__, #e) : (void)0)
+
+void test_assert() {
+  myassert(0 && "unreachable");
+  return; // no-warning
+}
+
+// Test case for PR 9774.  Tests that dead code in macros aren't warned about.
+#define MY_MAX(a,b)     ((a) >= (b) ? (a) : (b))
+void PR9774(int *s) {
+    for (int i = 0; i < MY_MAX(2, 3); i++) // no-warning
+        s[i] = 0;
+}
+