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// RUN: %clang_analyze_cc1 -verify %s \
// RUN: -analyzer-checker=core,alpha.unix.cstring
// This file is generally for the alpha.unix.cstring.UninitializedRead Checker, the reason for putting it into
// the separate file because the checker is break the some existing test cases in bstring.c file , so we don't
// wanna mess up with some existing test case so it's better to create separate file for it, this file also include
// the broken test for the reference in future about the broken tests.
typedef typeof(sizeof(int)) size_t;
void clang_analyzer_eval(int);
void *memcpy(void *restrict s1, const void *restrict s2, size_t n);
void top(char *dst) {
char buf[10];
memcpy(dst, buf, 10); // expected-warning{{Bytes string function accesses uninitialized/garbage values}}
(void)buf;
}
//===----------------------------------------------------------------------===
// mempcpy()
//===----------------------------------------------------------------------===
void *mempcpy(void *restrict s1, const void *restrict s2, size_t n);
void mempcpy14() {
int src[] = {1, 2, 3, 4};
int dst[5] = {0};
int *p;
p = mempcpy(dst, src, 4 * sizeof(int)); // expected-warning{{Bytes string function accesses uninitialized/garbage values}}
// FIXME: This behaviour is actually surprising and needs to be fixed,
// mempcpy seems to consider the very last byte of the src buffer uninitialized
// and returning undef unfortunately. It should have returned unknown or a conjured value instead.
clang_analyzer_eval(p == &dst[4]); // no-warning (above is fatal)
}
struct st {
int i;
int j;
};
void mempcpy15() {
struct st s1 = {0};
struct st s2;
struct st *p1;
struct st *p2;
p1 = (&s2) + 1;
p2 = mempcpy(&s2, &s1, sizeof(struct st)); // expected-warning{{Bytes string function accesses uninitialized/garbage values}}
// FIXME: It seems same as mempcpy14() case.
clang_analyzer_eval(p1 == p2); // no-warning (above is fatal)
}
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