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Diffstat (limited to 'gcc/tristate.cc')
| -rw-r--r-- | gcc/tristate.cc | 221 |
1 files changed, 221 insertions, 0 deletions
diff --git a/gcc/tristate.cc b/gcc/tristate.cc new file mode 100644 index 0000000..127d740 --- /dev/null +++ b/gcc/tristate.cc @@ -0,0 +1,221 @@ +/* "True" vs "False" vs "Unknown". + Copyright (C) 2019-2020 Free Software Foundation, Inc. + Contributed by David Malcolm <dmalcolm@redhat.com>. + +This file is part of GCC. + +GCC is free software; you can redistribute it and/or modify it +under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 3, or (at your option) +any later version. + +GCC is distributed in the hope that it will be useful, but +WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +General Public License for more details. + +You should have received a copy of the GNU General Public License +along with GCC; see the file COPYING3. If not see +<http://www.gnu.org/licenses/>. */ + +#include "config.h" +#include "system.h" +#include "coretypes.h" +#include "tristate.h" +#include "selftest.h" + +const char * +tristate::as_string () const +{ + switch (m_value) + { + default: + gcc_unreachable (); + case TS_UNKNOWN: + return "UNKNOWN"; + case TS_TRUE: + return "TRUE"; + case TS_FALSE: + return "FALSE"; + } +} + +tristate +tristate::not_ () const +{ + switch (m_value) + { + default: + gcc_unreachable (); + case TS_UNKNOWN: + return tristate (TS_UNKNOWN); + case TS_TRUE: + return tristate (TS_FALSE); + case TS_FALSE: + return tristate (TS_TRUE); + } +} + +tristate +tristate::or_ (tristate other) const +{ + switch (m_value) + { + default: + gcc_unreachable (); + case TS_UNKNOWN: + if (other.is_true ()) + return tristate (TS_TRUE); + else + return tristate (TS_UNKNOWN); + case TS_FALSE: + return other; + case TS_TRUE: + return tristate (TS_TRUE); + } +} + +tristate +tristate::and_ (tristate other) const +{ + switch (m_value) + { + default: + gcc_unreachable (); + case TS_UNKNOWN: + if (other.is_false ()) + return tristate (TS_FALSE); + else + return tristate (TS_UNKNOWN); + case TS_TRUE: + return other; + case TS_FALSE: + return tristate (TS_FALSE); + } +} + +#if CHECKING_P + +namespace selftest { + +#define ASSERT_TRISTATE_TRUE(TRISTATE) \ + SELFTEST_BEGIN_STMT \ + ASSERT_EQ (TRISTATE, tristate (tristate::TS_TRUE)); \ + SELFTEST_END_STMT + +#define ASSERT_TRISTATE_FALSE(TRISTATE) \ + SELFTEST_BEGIN_STMT \ + ASSERT_EQ (TRISTATE, tristate (tristate::TS_FALSE)); \ + SELFTEST_END_STMT + +#define ASSERT_TRISTATE_UNKNOWN(TRISTATE) \ + SELFTEST_BEGIN_STMT \ + ASSERT_EQ (TRISTATE, tristate (tristate::TS_UNKNOWN)); \ + SELFTEST_END_STMT + +/* Test tristate's ctors, along with is_*, as_string, operator==, and + operator!=. */ + +static void +test_ctors () +{ + tristate u (tristate::TS_UNKNOWN); + ASSERT_FALSE (u.is_known ()); + ASSERT_FALSE (u.is_true ()); + ASSERT_FALSE (u.is_false ()); + ASSERT_STREQ (u.as_string (), "UNKNOWN"); + + tristate t (tristate::TS_TRUE); + ASSERT_TRUE (t.is_known ()); + ASSERT_TRUE (t.is_true ()); + ASSERT_FALSE (t.is_false ()); + ASSERT_STREQ (t.as_string (), "TRUE"); + + tristate f (tristate::TS_FALSE); + ASSERT_TRUE (f.is_known ()); + ASSERT_FALSE (f.is_true ()); + ASSERT_TRUE (f.is_false ()); + ASSERT_STREQ (f.as_string (), "FALSE"); + + ASSERT_EQ (u, u); + ASSERT_EQ (t, t); + ASSERT_EQ (f, f); + ASSERT_NE (u, t); + ASSERT_NE (u, f); + ASSERT_NE (t, f); + + tristate t2 (true); + ASSERT_TRUE (t2.is_true ()); + ASSERT_EQ (t, t2); + + tristate f2 (false); + ASSERT_TRUE (f2.is_false ()); + ASSERT_EQ (f, f2); + + tristate u2 (tristate::unknown ()); + ASSERT_TRUE (!u2.is_known ()); + ASSERT_EQ (u, u2); +} + +/* Test && on tristate instances. */ + +static void +test_and () +{ + ASSERT_TRISTATE_UNKNOWN (tristate::unknown () && tristate::unknown ()); + + ASSERT_TRISTATE_FALSE (tristate (false) && tristate (false)); + ASSERT_TRISTATE_FALSE (tristate (false) && tristate (true)); + ASSERT_TRISTATE_FALSE (tristate (true) && tristate (false)); + ASSERT_TRISTATE_TRUE (tristate (true) && tristate (true)); + + ASSERT_TRISTATE_UNKNOWN (tristate::unknown () && tristate (true)); + ASSERT_TRISTATE_UNKNOWN (tristate (true) && tristate::unknown ()); + + ASSERT_TRISTATE_FALSE (tristate::unknown () && tristate (false)); + ASSERT_TRISTATE_FALSE (tristate (false) && tristate::unknown ()); +} + +/* Test || on tristate instances. */ + +static void +test_or () +{ + ASSERT_TRISTATE_UNKNOWN (tristate::unknown () || tristate::unknown ()); + + ASSERT_TRISTATE_FALSE (tristate (false) || tristate (false)); + ASSERT_TRISTATE_TRUE (tristate (false) || tristate (true)); + ASSERT_TRISTATE_TRUE (tristate (true) || tristate (false)); + ASSERT_TRISTATE_TRUE (tristate (true) || tristate (true)); + + ASSERT_TRISTATE_TRUE (tristate::unknown () || tristate (true)); + ASSERT_TRISTATE_TRUE (tristate (true) || tristate::unknown ()); + + ASSERT_TRISTATE_UNKNOWN (tristate::unknown () || tristate (false)); + ASSERT_TRISTATE_UNKNOWN (tristate (false) || tristate::unknown ()); +} + +/* Test ! on tristate instances. */ + +static void +test_not () +{ + ASSERT_TRISTATE_UNKNOWN (!tristate::unknown ()); + ASSERT_TRISTATE_FALSE (!tristate (true)); + ASSERT_TRISTATE_TRUE (!tristate (false)); +} + +/* Run all of the selftests within this file. */ + +void +tristate_cc_tests () +{ + test_ctors (); + test_and (); + test_or (); + test_not (); +} + +} // namespace selftest + +#endif /* CHECKING_P */ |