forked from OSchip/llvm-project
85 lines
2.6 KiB
C
85 lines
2.6 KiB
C
// RUN: %clang_analyze_cc1 %s \
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// RUN: -analyzer-checker=core \
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// RUN: -analyzer-checker=debug.ExprInspection \
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// RUN: -verify
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void clang_analyzer_warnIfReached();
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void clang_analyzer_eval(int);
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void rem_constant_rhs_ne_zero(int x, int y) {
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if (x % 3 == 0) // x % 3 != 0 -> x != 0
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return;
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if (x * y != 0) // x * y == 0
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return;
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if (y != 1) // y == 1 -> x == 0
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return;
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clang_analyzer_warnIfReached(); // no-warning
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(void)x; // keep the constraints alive.
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}
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void rem_symbolic_rhs_ne_zero(int x, int y, int z) {
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if (x % z == 0) // x % z != 0 -> x != 0
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return;
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if (x * y != 0) // x * y == 0
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return;
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if (y != 1) // y == 1 -> x == 0
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return;
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clang_analyzer_warnIfReached(); // no-warning
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(void)x; // keep the constraints alive.
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}
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void rem_symbolic_rhs_ne_zero_nested(int w, int x, int y, int z) {
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if (w % x % z == 0) // w % x % z != 0 -> w % x != 0
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return;
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if (w % x * y != 0) // w % x * y == 0
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return;
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if (y != 1) // y == 1 -> w % x == 0
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return;
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clang_analyzer_warnIfReached(); // no-warning
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(void)(w * x); // keep the constraints alive.
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}
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void rem_constant_rhs_ne_zero_early_contradiction(int x, int y) {
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if ((x + y) != 0) // (x + y) == 0
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return;
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if ((x + y) % 3 == 0) // (x + y) % 3 != 0 -> (x + y) != 0 -> contradiction
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return;
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clang_analyzer_warnIfReached(); // no-warning
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(void)x; // keep the constraints alive.
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}
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void rem_symbolic_rhs_ne_zero_early_contradiction(int x, int y, int z) {
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if ((x + y) != 0) // (x + y) == 0
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return;
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if ((x + y) % z == 0) // (x + y) % z != 0 -> (x + y) != 0 -> contradiction
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return;
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clang_analyzer_warnIfReached(); // no-warning
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(void)x; // keep the constraints alive.
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}
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void internal_unsigned_signed_mismatch(unsigned a) {
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int d = a;
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// Implicit casts are not handled, thus the analyzer models `d % 2` as
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// `(reg_$0<unsigned int a>) % 2`
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// However, this should not result in internal signedness mismatch error when
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// we assign new constraints below.
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if (d % 2 != 0)
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return;
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}
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void remainder_with_adjustment(int x) {
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if ((x + 1) % 3 == 0) // (x + 1) % 3 != 0 -> x + 1 != 0 -> x != -1
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return;
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clang_analyzer_eval(x + 1 != 0); // expected-warning{{TRUE}}
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clang_analyzer_eval(x != -1); // expected-warning{{TRUE}}
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(void)x; // keep the constraints alive.
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}
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void remainder_with_adjustment_of_composit_lhs(int x, int y) {
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if ((x + y + 1) % 3 == 0) // (x + 1) % 3 != 0 -> x + 1 != 0 -> x != -1
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return;
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clang_analyzer_eval(x + y + 1 != 0); // expected-warning{{TRUE}}
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clang_analyzer_eval(x + y != -1); // expected-warning{{TRUE}}
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(void)(x * y); // keep the constraints alive.
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}
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