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[WIP] Optionally model the LLVM assume statement in Boogie #478
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#include "smack.h" | ||
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// @expect verified | ||
// @flag --llvm-assumes=use | ||
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int main(void) { | ||
unsigned int y = 2 * (unsigned int)__VERIFIER_nondet_unsigned_short(); | ||
// This assumption is used for verification, even though bit-precise | ||
// is not enabled, the assertion will pass. | ||
__builtin_assume((y & 1) == 0); | ||
__VERIFIER_assert((y & 1) == 0); | ||
} |
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Original file line number | Diff line number | Diff line change |
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#include "smack.h" | ||
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// @expect verified | ||
// @flag --llvm-assumes=use | ||
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int main(void) { | ||
unsigned int y = (2 * (unsigned int)__VERIFIER_nondet_unsigned_short()) + 1; | ||
// This assumption is used for verification, even though the assumption | ||
// is false, the assertion will pass. | ||
__builtin_assume((y & 1) == 0); | ||
__VERIFIER_assert((y & 1) == 0); | ||
} |
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Original file line number | Diff line number | Diff line change |
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#include "smack.h" | ||
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// @expect verified | ||
// @flag --llvm-assumes=check | ||
// @flag --bit-precise | ||
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int main(void) { | ||
unsigned int y = 2 * (unsigned int)__VERIFIER_nondet_unsigned_short(); | ||
// This assumption is checked under bit-precise and is verified. | ||
__builtin_assume((y & 1) == 0); | ||
__VERIFIER_assert((y & 1) == 0); | ||
} |
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,13 @@ | ||
#include "smack.h" | ||
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// @expect verified | ||
// @flag --llvm-assumes=check | ||
// @flag --bit-precise | ||
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int main(void) { | ||
unsigned int y = (2 * (unsigned int)__VERIFIER_nondet_unsigned_short()) + 1; | ||
// This assumption is checked at verification time, and since bit-precise | ||
// is enabled, and y is clearly odd, the check will pass. | ||
__builtin_assume((y & 1) == 1); | ||
__VERIFIER_assert((y & 1) == 1); | ||
} |
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,13 @@ | ||
#include "smack.h" | ||
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// @expect error | ||
// @flag --llvm-assumes=check | ||
// @flag --bit-precise | ||
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int main(void) { | ||
unsigned int y = (2 * (unsigned int)__VERIFIER_nondet_unsigned_short()) + 1; | ||
// This assumption is checked at verification time, and since bit-precise | ||
// is enabled, and y is clearly odd, the assumption should be shown false. | ||
__builtin_assume((y & 1) == 0); | ||
__VERIFIER_assert((y & 1) == 0); | ||
} |
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,12 @@ | ||
#include "smack.h" | ||
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// @expect error | ||
// @flag --llvm-assumes=none | ||
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int main(void) { | ||
unsigned int y = 2 * (unsigned int)__VERIFIER_nondet_unsigned_short(); | ||
// This assumption is not used, and since bit-precise is not enabled, | ||
// verification will fail. | ||
__builtin_assume((y & 1) == 0); | ||
__VERIFIER_assert((y & 1) == 0); | ||
} |
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