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// RUN: %clang_cc1 -analyze -analyzer-checker=core,unix.Malloc,debug.ExprInspection -analyzer-max-loop 4 -analyzer-config widen-loops=true -verify %s
void clang_analyzer_eval(int);
void clang_analyzer_warnIfReached();
typedef __typeof(sizeof(int)) size_t;
void *malloc(size_t);
void free(void *);
void loop_which_iterates_limit_times_not_widened() {
int i;
int x = 1;
// Check loop isn't widened by checking x isn't invalidated
for (i = 0; i < 1; ++i) {}
clang_analyzer_eval(x == 1); // expected-warning {{TRUE}}
for (i = 0; i < 2; ++i) {}
clang_analyzer_eval(x == 1); // expected-warning {{TRUE}}
for (i = 0; i < 3; ++i) {}
// FIXME loss of precision as a result of evaluating the widened loop body
// *instead* of the last iteration.
clang_analyzer_eval(x == 1); // expected-warning {{UNKNOWN}}
}
int a_global;
void loop_evaluated_before_widening() {
int i;
a_global = 1;
for (i = 0; i < 10; ++i) {
if (i == 2) {
// True before widening then unknown after.
clang_analyzer_eval(a_global == 1); // expected-warning{{TRUE}} expected-warning{{UNKNOWN}}
}
}
clang_analyzer_warnIfReached(); // expected-warning{{REACHABLE}}
}
void warnings_after_loop() {
int i;
for (i = 0; i < 10; ++i) {}
char *m = (char*)malloc(12);
} // expected-warning {{Potential leak of memory pointed to by 'm'}}
void for_loop_exits() {
int i;
for (i = 0; i < 10; ++i) {}
clang_analyzer_warnIfReached(); // expected-warning{{REACHABLE}}
}
void while_loop_exits() {
int i = 0;
while (i < 10) {++i;}
clang_analyzer_warnIfReached(); // expected-warning{{REACHABLE}}
}
void do_while_loop_exits() {
int i = 0;
do {++i;} while (i < 10);
clang_analyzer_warnIfReached(); // expected-warning{{REACHABLE}}
}
void loop_body_is_widened() {
int i = 0;
while (i < 100) {
if (i > 10) {
clang_analyzer_warnIfReached(); // expected-warning{{REACHABLE}}
}
++i;
}
clang_analyzer_warnIfReached(); // expected-warning{{REACHABLE}}
}
void invariably_infinite_loop() {
int i = 0;
while (1) { ++i; }
clang_analyzer_warnIfReached(); // no-warning
}
void invariably_infinite_break_loop() {
int i = 0;
while (1) {
++i;
int x = 1;
if (!x) break;
}
clang_analyzer_warnIfReached(); // no-warning
}
void reachable_break_loop() {
int i = 0;
while (1) {
++i;
if (i == 100) break;
}
clang_analyzer_warnIfReached(); // expected-warning{{REACHABLE}}
}
void condition_constrained_true_in_loop() {
int i = 0;
while (i < 50) {
clang_analyzer_eval(i < 50); // expected-warning {{TRUE}}
++i;
}
clang_analyzer_warnIfReached(); // expected-warning{{REACHABLE}}
}
void condition_constrained_false_after_loop() {
int i = 0;
while (i < 50) {
++i;
}
clang_analyzer_eval(i >= 50); // expected-warning {{TRUE}}
clang_analyzer_warnIfReached(); // expected-warning{{REACHABLE}}
}
void multiple_exit_test() {
int x = 0;
int i = 0;
while (i < 50) {
if (x) {
i = 10;
break;
}
++i;
}
// Reachable by 'normal' exit
if (i == 50) clang_analyzer_warnIfReached(); // expected-warning{{REACHABLE}}
// Reachable by break point
if (i == 10) clang_analyzer_warnIfReached(); // expected-warning{{REACHABLE}}
// Not reachable
if (i < 10) clang_analyzer_warnIfReached(); // no-warning
if (i > 10 && i < 50) clang_analyzer_warnIfReached(); // no-warning
}
void pointer_doesnt_leak_from_loop() {
int *h_ptr = (int *) malloc(sizeof(int));
for (int i = 0; i < 2; ++i) {}
for (int i = 0; i < 10; ++i) {} // no-warning
free(h_ptr);
}
int g_global;
void unknown_after_loop(int s_arg) {
g_global = 0;
s_arg = 1;
int s_local = 2;
int *h_ptr = malloc(sizeof(int));
for (int i = 0; i < 10; ++i) {}
clang_analyzer_eval(g_global); // expected-warning {{UNKNOWN}}
clang_analyzer_eval(s_arg); // expected-warning {{UNKNOWN}}
clang_analyzer_eval(s_local); // expected-warning {{UNKNOWN}}
clang_analyzer_eval(h_ptr == 0); // expected-warning {{UNKNOWN}}
free(h_ptr);
}
void variable_bound_exiting_loops_widened(int x) {
int i = 0;
int t = 1;
while (i < x) {
++i;
}
clang_analyzer_eval(t == 1); // expected-warning {{TRUE}} // expected-warning {{UNKNOWN}}
}
void nested_loop_outer_widen() {
int i = 0, j = 0;
for (i = 0; i < 10; i++) {
clang_analyzer_eval(i < 10); // expected-warning {{TRUE}}
for (j = 0; j < 2; j++) {
clang_analyzer_eval(j < 2); // expected-warning {{TRUE}}
}
clang_analyzer_eval(j >= 2); // expected-warning {{TRUE}}
}
clang_analyzer_eval(i >= 10); // expected-warning {{TRUE}}
}
void nested_loop_inner_widen() {
int i = 0, j = 0;
for (i = 0; i < 2; i++) {
clang_analyzer_eval(i < 2); // expected-warning {{TRUE}}
for (j = 0; j < 10; j++) {
clang_analyzer_eval(j < 10); // expected-warning {{TRUE}}
}
clang_analyzer_eval(j >= 10); // expected-warning {{TRUE}}
}
clang_analyzer_eval(i >= 2); // expected-warning {{TRUE}}
}
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