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-rw-r--r--test/Sema/tautological-constant-compare.c585
1 files changed, 585 insertions, 0 deletions
diff --git a/test/Sema/tautological-constant-compare.c b/test/Sema/tautological-constant-compare.c
new file mode 100644
index 0000000000000..c48aa99444538
--- /dev/null
+++ b/test/Sema/tautological-constant-compare.c
@@ -0,0 +1,585 @@
+// RUN: %clang_cc1 -triple x86_64-linux-gnu -fsyntax-only -DTEST -verify %s
+// RUN: %clang_cc1 -triple x86_64-linux-gnu -fsyntax-only -Wno-tautological-constant-compare -verify %s
+// RUN: %clang_cc1 -triple x86_64-linux-gnu -fsyntax-only -DTEST -verify -x c++ %s
+// RUN: %clang_cc1 -triple x86_64-linux-gnu -fsyntax-only -Wno-tautological-constant-compare -verify -x c++ %s
+
+int value(void);
+
+#define macro(val) val
+
+#ifdef __cplusplus
+template<typename T>
+void TFunc() {
+ // Make sure that we do warn for normal variables in template functions !
+ unsigned char c = value();
+#ifdef TEST
+ if (c > 255) // expected-warning {{comparison 'unsigned char' > 255 is always false}}
+ return;
+#else
+ if (c > 255)
+ return;
+#endif
+
+ if (c > macro(255))
+ return;
+
+ T v = value();
+ if (v > 255)
+ return;
+ if (v > 32767)
+ return;
+}
+#endif
+
+int main()
+{
+#ifdef __cplusplus
+ TFunc<unsigned char>();
+ TFunc<signed short>();
+#endif
+
+ short s = value();
+
+#ifdef TEST
+ if (s == 32767)
+ return 0;
+ if (s != 32767)
+ return 0;
+ if (s < 32767)
+ return 0;
+ if (s <= 32767) // expected-warning {{comparison 'short' <= 32767 is always true}}
+ return 0;
+ if (s > 32767) // expected-warning {{comparison 'short' > 32767 is always false}}
+ return 0;
+ if (s >= 32767)
+ return 0;
+
+ if (32767 == s)
+ return 0;
+ if (32767 != s)
+ return 0;
+ if (32767 < s) // expected-warning {{comparison 32767 < 'short' is always false}}
+ return 0;
+ if (32767 <= s)
+ return 0;
+ if (32767 > s)
+ return 0;
+ if (32767 >= s) // expected-warning {{comparison 32767 >= 'short' is always true}}
+ return 0;
+
+ // FIXME: assumes two's complement
+ if (s == -32768)
+ return 0;
+ if (s != -32768)
+ return 0;
+ if (s < -32768) // expected-warning {{comparison 'short' < -32768 is always false}}
+ return 0;
+ if (s <= -32768)
+ return 0;
+ if (s > -32768)
+ return 0;
+ if (s >= -32768) // expected-warning {{comparison 'short' >= -32768 is always true}}
+ return 0;
+
+ if (-32768 == s)
+ return 0;
+ if (-32768 != s)
+ return 0;
+ if (-32768 < s)
+ return 0;
+ if (-32768 <= s) // expected-warning {{comparison -32768 <= 'short' is always true}}
+ return 0;
+ if (-32768 > s) // expected-warning {{comparison -32768 > 'short' is always false}}
+ return 0;
+ if (-32768 >= s)
+ return 0;
+
+ // Note: both sides are promoted to unsigned long prior to the comparison, so
+ // it is perfectly possible for a short to compare greater than 32767UL.
+ if (s == 32767UL)
+ return 0;
+ if (s != 32767UL)
+ return 0;
+ if (s < 32767UL)
+ return 0;
+ if (s <= 32767UL)
+ return 0;
+ if (s > 32767UL)
+ return 0;
+ if (s >= 32767UL)
+ return 0;
+
+ if (32767UL == s)
+ return 0;
+ if (32767UL != s)
+ return 0;
+ if (32767UL < s)
+ return 0;
+ if (32767UL <= s)
+ return 0;
+ if (32767UL > s)
+ return 0;
+ if (32767UL >= s)
+ return 0;
+
+ if (s == 0UL)
+ return 0;
+ if (s != 0UL)
+ return 0;
+ if (s < 0UL) // expected-warning {{comparison of unsigned expression < 0 is always false}}
+ return 0;
+ if (s <= 0UL)
+ return 0;
+ if (s > 0UL)
+ return 0;
+ if (s >= 0UL) // expected-warning {{comparison of unsigned expression >= 0 is always true}}
+ return 0;
+
+ if (0UL == s)
+ return 0;
+ if (0UL != s)
+ return 0;
+ if (0UL < s)
+ return 0;
+ if (0UL <= s) // expected-warning {{comparison of 0 <= unsigned expression is always true}}
+ return 0;
+ if (0UL > s) // expected-warning {{comparison of 0 > unsigned expression is always false}}
+ return 0;
+ if (0UL >= s)
+ return 0;
+
+ enum { ULONG_MAX = (2UL * (unsigned long)__LONG_MAX__ + 1UL) };
+ if (s == 2UL * (unsigned long)__LONG_MAX__ + 1UL)
+ return 0;
+ if (s != 2UL * (unsigned long)__LONG_MAX__ + 1UL)
+ return 0;
+ if (s < 2UL * (unsigned long)__LONG_MAX__ + 1UL)
+ return 0;
+ if (s <= 2UL * (unsigned long)__LONG_MAX__ + 1UL) // expected-warning-re {{comparison 'short' <= {{.*}} is always true}}
+ return 0;
+ if (s > 2UL * (unsigned long)__LONG_MAX__ + 1UL) // expected-warning-re {{comparison 'short' > {{.*}} is always false}}
+ return 0;
+ if (s >= 2UL * (unsigned long)__LONG_MAX__ + 1UL)
+ return 0;
+
+ if (2UL * (unsigned long)__LONG_MAX__ + 1UL == s)
+ return 0;
+ if (2UL * (unsigned long)__LONG_MAX__ + 1UL != s)
+ return 0;
+ if (2UL * (unsigned long)__LONG_MAX__ + 1UL < s) // expected-warning-re {{comparison {{.*}} < 'short' is always false}}
+ return 0;
+ if (2UL * (unsigned long)__LONG_MAX__ + 1UL <= s)
+ return 0;
+ if (2UL * (unsigned long)__LONG_MAX__ + 1UL > s)
+ return 0;
+ if (2UL * (unsigned long)__LONG_MAX__ + 1UL >= s) // expected-warning-re {{comparison {{.*}} >= 'short' is always true}}
+ return 0;
+
+ // FIXME: assumes two's complement
+ if (s == -32768L)
+ return 0;
+ if (s != -32768L)
+ return 0;
+ if (s < -32768L) // expected-warning {{comparison 'short' < -32768 is always false}}
+ return 0;
+ if (s <= -32768L)
+ return 0;
+ if (s > -32768L)
+ return 0;
+ if (s >= -32768L) // expected-warning {{comparison 'short' >= -32768 is always true}}
+ return 0;
+
+ if (-32768L == s)
+ return 0;
+ if (-32768L != s)
+ return 0;
+ if (-32768L < s)
+ return 0;
+ if (-32768L <= s) // expected-warning {{comparison -32768 <= 'short' is always true}}
+ return 0;
+ if (-32768L > s) // expected-warning {{comparison -32768 > 'short' is always false}}
+ return 0;
+ if (-32768L >= s)
+ return 0;
+#else
+ // expected-no-diagnostics
+ if (s == 32767)
+ return 0;
+ if (s != 32767)
+ return 0;
+ if (s < 32767)
+ return 0;
+ if (s <= 32767)
+ return 0;
+ if (s > 32767)
+ return 0;
+ if (s >= 32767)
+ return 0;
+
+ if (32767 == s)
+ return 0;
+ if (32767 != s)
+ return 0;
+ if (32767 < s)
+ return 0;
+ if (32767 <= s)
+ return 0;
+ if (32767 > s)
+ return 0;
+ if (32767 >= s)
+ return 0;
+
+ // FIXME: assumes two's complement
+ if (s == -32768)
+ return 0;
+ if (s != -32768)
+ return 0;
+ if (s < -32768)
+ return 0;
+ if (s <= -32768)
+ return 0;
+ if (s > -32768)
+ return 0;
+ if (s >= -32768)
+ return 0;
+
+ if (-32768 == s)
+ return 0;
+ if (-32768 != s)
+ return 0;
+ if (-32768 < s)
+ return 0;
+ if (-32768 <= s)
+ return 0;
+ if (-32768 > s)
+ return 0;
+ if (-32768 >= s)
+ return 0;
+
+ if (s == 32767UL)
+ return 0;
+ if (s != 32767UL)
+ return 0;
+ if (s < 32767UL)
+ return 0;
+ if (s <= 32767UL)
+ return 0;
+ if (s > 32767UL)
+ return 0;
+ if (s >= 32767UL)
+ return 0;
+
+ if (32767UL == s)
+ return 0;
+ if (32767UL != s)
+ return 0;
+ if (32767UL < s)
+ return 0;
+ if (32767UL <= s)
+ return 0;
+ if (32767UL > s)
+ return 0;
+ if (32767UL >= s)
+ return 0;
+
+ // FIXME: assumes two's complement
+ if (s == -32768L)
+ return 0;
+ if (s != -32768L)
+ return 0;
+ if (s < -32768L)
+ return 0;
+ if (s <= -32768L)
+ return 0;
+ if (s > -32768L)
+ return 0;
+ if (s >= -32768L)
+ return 0;
+
+ if (-32768L == s)
+ return 0;
+ if (-32768L != s)
+ return 0;
+ if (-32768L < s)
+ return 0;
+ if (-32768L <= s)
+ return 0;
+ if (-32768L > s)
+ return 0;
+ if (-32768L >= s)
+ return 0;
+#endif
+
+ if (s == 0)
+ return 0;
+ if (s != 0)
+ return 0;
+ if (s < 0)
+ return 0;
+ if (s <= 0)
+ return 0;
+ if (s > 0)
+ return 0;
+ if (s >= 0)
+ return 0;
+
+ if (0 == s)
+ return 0;
+ if (0 != s)
+ return 0;
+ if (0 < s)
+ return 0;
+ if (0 <= s)
+ return 0;
+ if (0 > s)
+ return 0;
+ if (0 >= s)
+ return 0;
+
+ unsigned short us = value();
+
+#ifdef TEST
+ if (us == 65535)
+ return 0;
+ if (us != 65535)
+ return 0;
+ if (us < 65535)
+ return 0;
+ if (us <= 65535) // expected-warning {{comparison 'unsigned short' <= 65535 is always true}}
+ return 0;
+ if (us > 65535) // expected-warning {{comparison 'unsigned short' > 65535 is always false}}
+ return 0;
+ if (us >= 65535)
+ return 0;
+
+ if (65535 == us)
+ return 0;
+ if (65535 != us)
+ return 0;
+ if (65535 < us) // expected-warning {{comparison 65535 < 'unsigned short' is always false}}
+ return 0;
+ if (65535 <= us)
+ return 0;
+ if (65535 > us)
+ return 0;
+ if (65535 >= us) // expected-warning {{comparison 65535 >= 'unsigned short' is always true}}
+ return 0;
+
+ if (us == 65535UL)
+ return 0;
+ if (us != 65535UL)
+ return 0;
+ if (us < 65535UL)
+ return 0;
+ if (us <= 65535UL) // expected-warning {{comparison 'unsigned short' <= 65535 is always true}}
+ return 0;
+ if (us > 65535UL) // expected-warning {{comparison 'unsigned short' > 65535 is always false}}
+ return 0;
+ if (us >= 65535UL)
+ return 0;
+
+ if (65535UL == us)
+ return 0;
+ if (65535UL != us)
+ return 0;
+ if (65535UL < us) // expected-warning {{comparison 65535 < 'unsigned short' is always false}}
+ return 0;
+ if (65535UL <= us)
+ return 0;
+ if (65535UL > us)
+ return 0;
+ if (65535UL >= us) // expected-warning {{comparison 65535 >= 'unsigned short' is always true}}
+ return 0;
+#else
+ // expected-no-diagnostics
+ if (us == 65535)
+ return 0;
+ if (us != 65535)
+ return 0;
+ if (us < 65535)
+ return 0;
+ if (us <= 65535)
+ return 0;
+ if (us > 65535)
+ return 0;
+ if (us >= 65535)
+ return 0;
+
+ if (65535 == us)
+ return 0;
+ if (65535 != us)
+ return 0;
+ if (65535 < us)
+ return 0;
+ if (65535 <= us)
+ return 0;
+ if (65535 > us)
+ return 0;
+ if (65535 >= us)
+ return 0;
+
+ if (us == 65535UL)
+ return 0;
+ if (us != 65535UL)
+ return 0;
+ if (us < 65535UL)
+ return 0;
+ if (us <= 65535UL)
+ return 0;
+ if (us > 65535UL)
+ return 0;
+ if (us >= 65535UL)
+ return 0;
+
+ if (65535UL == us)
+ return 0;
+ if (65535UL != us)
+ return 0;
+ if (65535UL < us)
+ return 0;
+ if (65535UL <= us)
+ return 0;
+ if (65535UL > us)
+ return 0;
+ if (65535UL >= us)
+ return 0;
+#endif
+
+ if (us == 32767)
+ return 0;
+ if (us != 32767)
+ return 0;
+ if (us < 32767)
+ return 0;
+ if (us <= 32767)
+ return 0;
+ if (us > 32767)
+ return 0;
+ if (us >= 32767)
+ return 0;
+
+ if (32767 == us)
+ return 0;
+ if (32767 != us)
+ return 0;
+ if (32767 < us)
+ return 0;
+ if (32767 <= us)
+ return 0;
+ if (32767 > us)
+ return 0;
+ if (32767 >= us)
+ return 0;
+
+ if (us == 32767UL)
+ return 0;
+ if (us != 32767UL)
+ return 0;
+ if (us < 32767UL)
+ return 0;
+ if (us <= 32767UL)
+ return 0;
+ if (us > 32767UL)
+ return 0;
+ if (us >= 32767UL)
+ return 0;
+
+ if (32767UL == us)
+ return 0;
+ if (32767UL != us)
+ return 0;
+ if (32767UL < us)
+ return 0;
+ if (32767UL <= us)
+ return 0;
+ if (32767UL > us)
+ return 0;
+ if (32767UL >= us)
+ return 0;
+
+#if __SIZEOF_INT128__
+ __int128 i128;
+ if (i128 == -1) // used to crash
+ return 0;
+#endif
+
+
+ enum E {
+ yes,
+ no,
+ maybe
+ };
+ enum E e;
+
+ if (e == yes)
+ return 0;
+ if (e != yes)
+ return 0;
+ if (e < yes)
+ return 0;
+ if (e <= yes)
+ return 0;
+ if (e > yes)
+ return 0;
+ if (e >= yes)
+ return 0;
+
+ if (yes == e)
+ return 0;
+ if (yes != e)
+ return 0;
+ if (yes < e)
+ return 0;
+ if (yes <= e)
+ return 0;
+ if (yes > e)
+ return 0;
+ if (yes >= e)
+ return 0;
+
+ if (e == maybe)
+ return 0;
+ if (e != maybe)
+ return 0;
+ if (e < maybe)
+ return 0;
+ if (e <= maybe)
+ return 0;
+ if (e > maybe)
+ return 0;
+ if (e >= maybe)
+ return 0;
+
+ if (maybe == e)
+ return 0;
+ if (maybe != e)
+ return 0;
+ if (maybe < e)
+ return 0;
+ if (maybe <= e)
+ return 0;
+ if (maybe > e)
+ return 0;
+ if (maybe >= e)
+ return 0;
+
+ // For the time being, use the declared type of bit-fields rather than their
+ // length when determining whether a value is in-range.
+ // FIXME: Reconsider this.
+ struct A {
+ int a : 3;
+ unsigned b : 3;
+ long c : 3;
+ unsigned long d : 3;
+ } a;
+ if (a.a < 3) {}
+ if (a.a < 4) {}
+ if (a.b < 7) {}
+ if (a.b < 8) {}
+ if (a.c < 3) {}
+ if (a.c < 4) {}
+ if (a.d < 7) {}
+ if (a.d < 8) {}
+
+ return 1;
+}
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