forked from OSchip/llvm-project
137 lines
3.8 KiB
C
137 lines
3.8 KiB
C
// RUN: %clang_analyze_cc1 -analyzer-checker=debug.ExprInspection -verify %s
|
|
|
|
void clang_analyzer_eval(int);
|
|
void clang_analyzer_warnOnDeadSymbol(int);
|
|
void clang_analyzer_numTimesReached();
|
|
void clang_analyzer_warnIfReached();
|
|
|
|
void exit(int);
|
|
|
|
int conjure_index();
|
|
|
|
void test_that_expr_inspection_works() {
|
|
do {
|
|
int x = conjure_index();
|
|
clang_analyzer_warnOnDeadSymbol(x);
|
|
} while(0); // expected-warning{{SYMBOL DEAD}}
|
|
|
|
// Make sure we don't accidentally split state in ExprInspection.
|
|
clang_analyzer_numTimesReached(); // expected-warning{{1}}
|
|
}
|
|
|
|
// These tests verify the reaping of symbols that are only referenced as
|
|
// index values in element regions. Most of the time, depending on where
|
|
// the element region, as Loc value, is stored, it is possible to
|
|
// recover the index symbol in checker code, which is also demonstrated
|
|
// in the return_ptr_range.c test file.
|
|
|
|
int arr[3];
|
|
|
|
int *test_element_index_lifetime_in_environment_values() {
|
|
int *ptr;
|
|
do {
|
|
int x = conjure_index();
|
|
clang_analyzer_warnOnDeadSymbol(x);
|
|
ptr = arr + x;
|
|
} while (0);
|
|
return ptr;
|
|
}
|
|
|
|
void test_element_index_lifetime_in_store_keys() {
|
|
do {
|
|
int x = conjure_index();
|
|
clang_analyzer_warnOnDeadSymbol(x);
|
|
arr[x] = 1;
|
|
if (x) {}
|
|
} while (0); // no-warning
|
|
}
|
|
|
|
int *ptr;
|
|
void test_element_index_lifetime_in_store_values() {
|
|
do {
|
|
int x = conjure_index();
|
|
clang_analyzer_warnOnDeadSymbol(x);
|
|
ptr = arr + x;
|
|
} while (0); // no-warning
|
|
}
|
|
|
|
struct S1 {
|
|
int field;
|
|
};
|
|
struct S2 {
|
|
struct S1 array[5];
|
|
} s2;
|
|
struct S3 {
|
|
void *field;
|
|
};
|
|
|
|
struct S1 *conjure_S1();
|
|
struct S3 *conjure_S3();
|
|
|
|
void test_element_index_lifetime_with_complicated_hierarchy_of_regions() {
|
|
do {
|
|
int x = conjure_index();
|
|
clang_analyzer_warnOnDeadSymbol(x);
|
|
s2.array[x].field = 1;
|
|
if (x) {}
|
|
} while (0); // no-warning
|
|
}
|
|
|
|
void test_loc_as_integer_element_index_lifetime() {
|
|
do {
|
|
int x;
|
|
struct S3 *s = conjure_S3();
|
|
clang_analyzer_warnOnDeadSymbol((int)s);
|
|
x = (int)&(s->field);
|
|
ptr = &arr[x];
|
|
if (s) {}
|
|
// FIXME: Should not warn. The symbol is still alive within the ptr's index.
|
|
} while (0); // expected-warning{{SYMBOL DEAD}}
|
|
}
|
|
|
|
// Test below checks lifetime of SymbolRegionValue in certain conditions.
|
|
|
|
int **ptrptr;
|
|
void test_region_lifetime_as_store_value(int *x) {
|
|
clang_analyzer_warnOnDeadSymbol((int) x);
|
|
*x = 1;
|
|
ptrptr = &x;
|
|
(void)0; // No-op; make sure the environment forgets things and the GC runs.
|
|
clang_analyzer_eval(**ptrptr); // expected-warning{{TRUE}}
|
|
} // no-warning
|
|
|
|
int *produce_region_referenced_only_through_field_in_environment_value() {
|
|
struct S1 *s = conjure_S1();
|
|
clang_analyzer_warnOnDeadSymbol((int) s);
|
|
int *x = &s->field;
|
|
return x;
|
|
}
|
|
|
|
void test_region_referenced_only_through_field_in_environment_value() {
|
|
produce_region_referenced_only_through_field_in_environment_value();
|
|
} // expected-warning{{SYMBOL DEAD}}
|
|
|
|
void test_region_referenced_only_through_field_in_store_value() {
|
|
struct S1 *s = conjure_S1();
|
|
clang_analyzer_warnOnDeadSymbol((int) s);
|
|
ptr = &s->field; // Write the symbol into a global. It should live forever.
|
|
if (!s) {
|
|
exit(0); // no-warning (symbol should not die here)
|
|
// exit() is noreturn.
|
|
clang_analyzer_warnIfReached(); // no-warning
|
|
}
|
|
if (!ptr) { // no-warning (symbol should not die here)
|
|
// We exit()ed under these constraints earlier.
|
|
clang_analyzer_warnIfReached(); // no-warning
|
|
}
|
|
// The exit() call invalidates globals. The symbol will die here because
|
|
// the exit() statement itself is already over and there's no better statement
|
|
// to put the diagnostic on.
|
|
} // expected-warning{{SYMBOL DEAD}}
|
|
|
|
void test_zombie_referenced_only_through_field_in_store_value() {
|
|
struct S1 *s = conjure_S1();
|
|
clang_analyzer_warnOnDeadSymbol((int) s);
|
|
int *x = &s->field;
|
|
} // expected-warning{{SYMBOL DEAD}}
|