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// RUN: %clang_cc1 -analyze -analyzer-checker=core,experimental.deadcode.UnreachableCode,unix.Malloc -verify -analyzer-constraints=basic %s
// RUN: %clang_cc1 -analyze -analyzer-checker=core,experimental.deadcode.UnreachableCode,unix.Malloc -verify -analyzer-constraints=range %s
// These are used to trigger warnings.
typedef typeof(sizeof(int)) size_t;
void *malloc(size_t);
void free(void *);
#define NULL ((void*)0)
#define UINT_MAX -1U
//---------------
// Plus/minus
//---------------
void separateExpressions (int a) {
int b = a + 1;
--b;
char* buf = malloc(1);
if (a != 0 && b == 0)
return; // expected-warning{{never executed}}
free(buf);
}
void oneLongExpression (int a) {
// Expression canonicalization should still allow this to work, even though
// the first term is on the left.
int b = 15 + a + 15 - 10 - 20;
char* buf = malloc(1);
if (a != 0 && b == 0)
return; // expected-warning{{never executed}}
free(buf);
}
void mixedTypes (int a) {
char* buf = malloc(1);
// Different additive types should not cause crashes when constant-folding.
// This is part of PR7406.
int b = a + 1LL;
if (a != 0 && (b-1) == 0) // not crash
return; // expected-warning{{never executed}}
int c = a + 1U;
if (a != 0 && (c-1) == 0) // not crash
return; // expected-warning{{never executed}}
free(buf);
}
//---------------
// Comparisons
//---------------
// Equality and inequality only
void eq_ne (unsigned a) {
char* b = NULL;
if (a == UINT_MAX)
b = malloc(1);
if (a+1 != 0)
return; // no-warning
if (a-1 != UINT_MAX-1)
return; // no-warning
free(b);
}
void ne_eq (unsigned a) {
char* b = NULL;
if (a != UINT_MAX)
b = malloc(1);
if (a+1 == 0)
return; // no-warning
if (a-1 == UINT_MAX-1)
return; // no-warning
free(b);
}
// Mixed typed inequalities (part of PR7406)
// These should not crash.
void mixed_eq_ne (int a) {
char* b = NULL;
if (a == 1)
b = malloc(1);
if (a+1U != 2)
return; // no-warning
if (a-1U != 0)
return; // expected-warning{{never executed}}
free(b);
}
void mixed_ne_eq (int a) {
char* b = NULL;
if (a != 1)
b = malloc(1);
if (a+1U == 2)
return; // no-warning
if (a-1U == 0)
return; // expected-warning{{never executed}}
free(b);
}
// Simple order comparisons with no adjustment
void baselineGT (unsigned a) {
char* b = NULL;
if (a > 0)
b = malloc(1);
if (a == 0)
return; // no-warning
free(b);
}
void baselineGE (unsigned a) {
char* b = NULL;
if (a >= UINT_MAX)
b = malloc(1);
if (a == UINT_MAX)
free(b);
return; // no-warning
}
void baselineLT (unsigned a) {
char* b = NULL;
if (a < UINT_MAX)
b = malloc(1);
if (a == UINT_MAX)
return; // no-warning
free(b);
}
void baselineLE (unsigned a) {
char* b = NULL;
if (a <= 0)
b = malloc(1);
if (a == 0)
free(b);
return; // no-warning
}
// Adjustment gives each of these an extra solution!
void adjustedGT (unsigned a) {
char* b = NULL;
if (a-1 > UINT_MAX-1)
b = malloc(1);
return; // expected-warning{{leak}}
}
void adjustedGE (unsigned a) {
char* b = NULL;
if (a-1 >= UINT_MAX-1)
b = malloc(1);
if (a == UINT_MAX)
free(b);
return; // expected-warning{{leak}}
}
void adjustedLT (unsigned a) {
char* b = NULL;
if (a+1 < 1)
b = malloc(1);
return; // expected-warning{{leak}}
}
void adjustedLE (unsigned a) {
char* b = NULL;
if (a+1 <= 1)
b = malloc(1);
if (a == 0)
free(b);
return; // expected-warning{{leak}}
}
// Tautologies
void tautologyGT (unsigned a) {
char* b = malloc(1);
if (a > UINT_MAX)
return; // no-warning
free(b);
}
void tautologyGE (unsigned a) {
char* b = malloc(1);
if (a >= 0) // expected-warning{{always true}}
free(b);
return; // no-warning
}
void tautologyLT (unsigned a) {
char* b = malloc(1);
if (a < 0) // expected-warning{{always false}}
return; // expected-warning{{never executed}}
free(b);
}
void tautologyLE (unsigned a) {
char* b = malloc(1);
if (a <= UINT_MAX)
free(b);
return; // no-warning
}
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