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/* Test the "verify" module.
Copyright (C) 2005, 2009-2022 Free Software Foundation, Inc.
This program 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 of the License, or
(at your option) any later version.
This program 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 this program. If not, see <https://www.gnu.org/licenses/>. */
/* Written by Bruno Haible. */
#include <config.h>
#include "verify.h"
#ifndef EXP_FAIL
# define EXP_FAIL 0
#endif
/* ======================= Test verify, verify_expr ======================= */
int gx;
enum { A, B, C };
#if EXP_FAIL == 1
verify (gx >= 0); /* should give ERROR: non-constant expression */
#endif
verify (C == 2); /* should be ok */
#if EXP_FAIL == 2
verify (1 + 1 == 3); /* should give ERROR */
#endif
verify (1 == 1); verify (1 == 1); /* should be ok */
enum
{
item = verify_expr (1 == 1, 10 * 0 + 17) /* should be ok */
};
static int
function (int n)
{
#if EXP_FAIL == 3
verify (n >= 0); /* should give ERROR: non-constant expression */
#endif
verify (C == 2); /* should be ok */
#if EXP_FAIL == 4
verify (1 + 1 == 3); /* should give ERROR */
#endif
verify (1 == 1); verify (1 == 1); /* should be ok */
if (n)
return ((void) verify_expr (1 == 1, 1), verify_expr (1 == 1, 8)); /* should be ok */
#if EXP_FAIL == 5
return verify_expr (1 == 2, 5); /* should give ERROR */
#endif
return 0;
}
/* ============================== Test assume ============================== */
static int
f (int a)
{
return a;
}
typedef struct { unsigned int context : 4; unsigned int halt : 1; } state;
void test_assume_expressions (state *s);
int test_assume_optimization (int x);
_Noreturn void test_assume_noreturn (void);
void
test_assume_expressions (state *s)
{
/* Check that 'assume' accepts a function call, even of a non-const
function. */
assume (f (1));
/* Check that 'assume' accepts a bit-field expression. */
assume (s->halt);
}
int
test_assume_optimization (int x)
{
/* Check that the compiler uses 'assume' for optimization.
This function, when compiled with optimization, should have code
equivalent to
return x + 3;
Use 'objdump --disassemble test-verify.o' to verify this. */
assume (x >= 4);
return (x > 1 ? x + 3 : 2 * x + 10);
}
_Noreturn void
test_assume_noreturn (void)
{
/* Check that the compiler's data-flow analysis recognizes 'assume (0)'.
This function should not elicit a warning. */
assume (0);
}
/* ============================== Main ===================================== */
int
main (void)
{
state s = { 0, 1 };
test_assume_expressions (&s);
test_assume_optimization (5);
return !(function (0) == 0 && function (1) == 8);
}
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