254 lines
10 KiB
C
254 lines
10 KiB
C
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// RUN: %clang_analyze_cc1 -analyzer-checker=core,debug.ExprInspection -verify -analyzer-config eagerly-assume=false %s
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#define UINT_MAX (~0U)
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#define INT_MAX (int)(UINT_MAX & (UINT_MAX >> 1))
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#define INT_MIN (int)(UINT_MAX & ~(UINT_MAX >> 1))
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void clang_analyzer_eval(int);
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// There should be no warnings unless otherwise indicated.
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void testComparisons (int a) {
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// Sema can already catch the simple comparison a==a,
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// since that's usually a logic error (and not path-dependent).
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int b = a;
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clang_analyzer_eval(b == a); // expected-warning{{TRUE}}
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clang_analyzer_eval(b >= a); // expected-warning{{TRUE}}
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clang_analyzer_eval(b <= a); // expected-warning{{TRUE}}
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clang_analyzer_eval(b != a); // expected-warning{{FALSE}}
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clang_analyzer_eval(b > a); // expected-warning{{FALSE}}
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clang_analyzer_eval(b < a); // expected-warning{{FALSE}}
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}
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void testSelfOperations (int a) {
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clang_analyzer_eval((a|a) == a); // expected-warning{{TRUE}}
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clang_analyzer_eval((a&a) == a); // expected-warning{{TRUE}}
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clang_analyzer_eval((a^a) == 0); // expected-warning{{TRUE}}
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clang_analyzer_eval((a-a) == 0); // expected-warning{{TRUE}}
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}
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void testIdempotent (int a) {
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clang_analyzer_eval((a*1) == a); // expected-warning{{TRUE}}
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clang_analyzer_eval((a/1) == a); // expected-warning{{TRUE}}
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clang_analyzer_eval((a+0) == a); // expected-warning{{TRUE}}
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clang_analyzer_eval((a-0) == a); // expected-warning{{TRUE}}
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clang_analyzer_eval((a<<0) == a); // expected-warning{{TRUE}}
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clang_analyzer_eval((a>>0) == a); // expected-warning{{TRUE}}
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clang_analyzer_eval((a^0) == a); // expected-warning{{TRUE}}
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clang_analyzer_eval((a&(~0)) == a); // expected-warning{{TRUE}}
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clang_analyzer_eval((a|0) == a); // expected-warning{{TRUE}}
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}
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void testReductionToConstant (int a) {
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clang_analyzer_eval((a*0) == 0); // expected-warning{{TRUE}}
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clang_analyzer_eval((a&0) == 0); // expected-warning{{TRUE}}
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clang_analyzer_eval((a|(~0)) == (~0)); // expected-warning{{TRUE}}
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}
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void testSymmetricIntSymOperations (int a) {
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clang_analyzer_eval((2+a) == (a+2)); // expected-warning{{TRUE}}
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clang_analyzer_eval((2*a) == (a*2)); // expected-warning{{TRUE}}
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clang_analyzer_eval((2&a) == (a&2)); // expected-warning{{TRUE}}
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clang_analyzer_eval((2^a) == (a^2)); // expected-warning{{TRUE}}
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clang_analyzer_eval((2|a) == (a|2)); // expected-warning{{TRUE}}
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}
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void testAsymmetricIntSymOperations (int a) {
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clang_analyzer_eval(((~0) >> a) == (~0)); // expected-warning{{TRUE}}
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clang_analyzer_eval((0 >> a) == 0); // expected-warning{{TRUE}}
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clang_analyzer_eval((0 << a) == 0); // expected-warning{{TRUE}}
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// Unsigned right shift shifts in zeroes.
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clang_analyzer_eval(((~0U) >> a) != (~0U)); // expected-warning{{UNKNOWN}}
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}
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void testLocations (char *a) {
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char *b = a;
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clang_analyzer_eval(b == a); // expected-warning{{TRUE}}
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clang_analyzer_eval(b >= a); // expected-warning{{TRUE}}
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clang_analyzer_eval(b <= a); // expected-warning{{TRUE}}
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clang_analyzer_eval(b != a); // expected-warning{{FALSE}}
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clang_analyzer_eval(b > a); // expected-warning{{FALSE}}
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clang_analyzer_eval(b < a); // expected-warning{{FALSE}}
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}
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void testMixedTypeComparisons (char a, unsigned long b) {
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if (a != 0) return;
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if (b != 0x100) return;
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clang_analyzer_eval(a <= b); // expected-warning{{TRUE}}
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clang_analyzer_eval(b >= a); // expected-warning{{TRUE}}
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clang_analyzer_eval(a != b); // expected-warning{{TRUE}}
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}
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void testBitwiseRules(unsigned int a, int b, int c) {
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clang_analyzer_eval((a | 1) >= 1); // expected-warning{{TRUE}}
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clang_analyzer_eval((a | -1) >= -1); // expected-warning{{TRUE}}
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clang_analyzer_eval((a | 2) >= 2); // expected-warning{{TRUE}}
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clang_analyzer_eval((a | 5) >= 5); // expected-warning{{TRUE}}
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clang_analyzer_eval((a | 10) >= 10); // expected-warning{{TRUE}}
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// Argument order should not influence this
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clang_analyzer_eval((1 | a) >= 1); // expected-warning{{TRUE}}
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clang_analyzer_eval((a & 1) <= 1); // expected-warning{{TRUE}}
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clang_analyzer_eval((a & 1) >= 0); // expected-warning{{TRUE}}
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clang_analyzer_eval((a & 2) <= 2); // expected-warning{{TRUE}}
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clang_analyzer_eval((a & 5) <= 5); // expected-warning{{TRUE}}
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clang_analyzer_eval((a & 10) <= 10); // expected-warning{{TRUE}}
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clang_analyzer_eval((a & -10) <= 10); // expected-warning{{UNKNOWN}}
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// Again, check for different argument order.
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clang_analyzer_eval((1 & a) <= 1); // expected-warning{{TRUE}}
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unsigned int d = a;
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d |= 1;
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clang_analyzer_eval((d | 0) == 0); // expected-warning{{FALSE}}
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// Rules don't apply to signed typed, as the values might be negative.
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clang_analyzer_eval((b | 1) > 0); // expected-warning{{UNKNOWN}}
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// Even for signed values, bitwise OR with a non-zero is always non-zero.
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clang_analyzer_eval((b | 1) == 0); // expected-warning{{FALSE}}
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clang_analyzer_eval((b | -2) == 0); // expected-warning{{FALSE}}
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clang_analyzer_eval((b | 10) == 0); // expected-warning{{FALSE}}
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clang_analyzer_eval((b | 0) == 0); // expected-warning{{UNKNOWN}}
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clang_analyzer_eval((b | -2) >= 0); // expected-warning{{FALSE}}
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// Check that we can operate with negative ranges
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if (b < 0) {
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clang_analyzer_eval((b | -1) == -1); // expected-warning{{TRUE}}
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clang_analyzer_eval((b | -10) >= -10); // expected-warning{{TRUE}}
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clang_analyzer_eval((b & 0) == 0); // expected-warning{{TRUE}}
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clang_analyzer_eval((b & -10) <= -10); // expected-warning{{TRUE}}
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clang_analyzer_eval((b & 5) >= 0); // expected-warning{{TRUE}}
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int e = (b | -5);
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clang_analyzer_eval(e >= -5 && e <= -1); // expected-warning{{TRUE}}
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if (b < -20) {
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clang_analyzer_eval((b | e) >= -5); // expected-warning{{TRUE}}
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clang_analyzer_eval((b & -10) < -20); // expected-warning{{TRUE}}
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clang_analyzer_eval((b & e) < -20); // expected-warning{{TRUE}}
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clang_analyzer_eval((b & -30) <= -30); // expected-warning{{TRUE}}
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if (c >= -30 && c <= -10) {
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clang_analyzer_eval((b & c) <= -20); // expected-warning{{TRUE}}
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}
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}
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if (a <= 40) {
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int g = (int)a & b;
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clang_analyzer_eval(g <= 40 && g >= 0); // expected-warning{{TRUE}}
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}
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// Check that we can reason about the result even if know nothing
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// about one of the operands.
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clang_analyzer_eval((b | c) != 0); // expected-warning{{TRUE}}
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}
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if (a <= 30 && b >= 10 && c >= 20) {
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// Check that we can reason about non-constant operands.
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clang_analyzer_eval((b | c) >= 20); // expected-warning{{TRUE}}
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// Check that we can reason about the resulting range even if
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// the types are not the same, but we still can convert operand
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// ranges.
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clang_analyzer_eval((a | b) >= 10); // expected-warning{{TRUE}}
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clang_analyzer_eval((a & b) <= 30); // expected-warning{{TRUE}}
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if (b <= 20) {
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clang_analyzer_eval((a & b) <= 20); // expected-warning{{TRUE}}
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}
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}
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// Check that dynamically computed constants also work.
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unsigned int constant = 1 << 3;
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unsigned int f = a | constant;
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clang_analyzer_eval(f >= constant); // expected-warning{{TRUE}}
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// Check that nested expressions also work.
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clang_analyzer_eval(((a | 10) | 5) >= 10); // expected-warning{{TRUE}}
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if (a < 10) {
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clang_analyzer_eval((a | 20) >= 20); // expected-warning{{TRUE}}
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}
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if (a > 10) {
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clang_analyzer_eval((a & 1) <= 1); // expected-warning{{TRUE}}
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}
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}
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void testRemainderRules(unsigned int a, unsigned int b, int c, int d) {
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// Check that we know that remainder of zero divided by any number is still 0.
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clang_analyzer_eval((0 % c) == 0); // expected-warning{{TRUE}}
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clang_analyzer_eval((10 % a) <= 10); // expected-warning{{TRUE}}
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if (a <= 30 && b <= 50) {
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clang_analyzer_eval((40 % a) < 30); // expected-warning{{TRUE}}
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clang_analyzer_eval((a % b) < 50); // expected-warning{{TRUE}}
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clang_analyzer_eval((b % a) < 30); // expected-warning{{TRUE}}
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if (a >= 10) {
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// Even though it seems like a valid assumption, it is not.
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// Check that we are not making this mistake.
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clang_analyzer_eval((a % b) >= 10); // expected-warning{{UNKNOWN}}
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// Check that we can we can infer when remainder is equal
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// to the dividend.
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clang_analyzer_eval((4 % a) == 4); // expected-warning{{TRUE}}
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if (b < 7) {
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clang_analyzer_eval((b % a) < 7); // expected-warning{{TRUE}}
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}
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}
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}
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if (c > -10) {
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clang_analyzer_eval((d % c) < INT_MAX); // expected-warning{{TRUE}}
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clang_analyzer_eval((d % c) > INT_MIN + 1); // expected-warning{{TRUE}}
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}
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// Check that we can reason about signed integers when they are
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// known to be positive.
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if (c >= 10 && c <= 30 && d >= 20 && d <= 50) {
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clang_analyzer_eval((5 % c) == 5); // expected-warning{{TRUE}}
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clang_analyzer_eval((c % d) <= 30); // expected-warning{{TRUE}}
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clang_analyzer_eval((c % d) >= 0); // expected-warning{{TRUE}}
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clang_analyzer_eval((d % c) < 30); // expected-warning{{TRUE}}
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clang_analyzer_eval((d % c) >= 0); // expected-warning{{TRUE}}
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}
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if (c >= -30 && c <= -10 && d >= -20 && d <= 50) {
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// Test positive LHS with negative RHS.
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clang_analyzer_eval((40 % c) < 30); // expected-warning{{TRUE}}
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clang_analyzer_eval((40 % c) > -30); // expected-warning{{TRUE}}
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// Test negative LHS with possibly negative RHS.
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clang_analyzer_eval((-10 % d) < 50); // expected-warning{{TRUE}}
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clang_analyzer_eval((-20 % d) > -50); // expected-warning{{TRUE}}
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// Check that we don't make wrong assumptions
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clang_analyzer_eval((-20 % d) > -20); // expected-warning{{UNKNOWN}}
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// Check that we can reason about negative ranges...
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clang_analyzer_eval((c % d) < 50); // expected-warning{{TRUE}}
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/// ...both ways
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clang_analyzer_eval((d % c) < 30); // expected-warning{{TRUE}}
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if (a <= 10) {
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// Result is unsigned. This means that 'c' is casted to unsigned.
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// We don't want to reason about ranges changing boundaries with
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// conversions.
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clang_analyzer_eval((a % c) < 30); // expected-warning{{UNKNOWN}}
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}
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}
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// Check that we work correctly when minimal unsigned value from a range is
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// equal to the signed minimum for the same bit width.
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unsigned int x = INT_MIN;
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if (a >= x && a <= x + 10) {
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clang_analyzer_eval((b % a) < x + 10); // expected-warning{{TRUE}}
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}
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}
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