forked from OSchip/llvm-project
114 lines
3.5 KiB
C
114 lines
3.5 KiB
C
// RUN: %clang_cc1 -analyze -analyzer-checker=core,unix.cstring,debug.ExprInspection -analyzer-store=region -verify %s
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// RUN: %clang_cc1 -analyze -DUSE_BUILTINS -analyzer-checker=core,unix.cstring,debug.ExprInspection -analyzer-store=region -verify %s
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// XFAIL: *
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// This file is for tests that may eventually go into string.c, or may be
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// deleted outright. At one point these tests passed, but only because we
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// weren't correctly modelling the behavior of the relevant string functions.
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// The tests aren't incorrect, but require the analyzer to be smarter about
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// conjured values than it currently is.
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//===----------------------------------------------------------------------===
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// Declarations
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//===----------------------------------------------------------------------===
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// Some functions are so similar to each other that they follow the same code
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// path, such as memcpy and __memcpy_chk, or memcmp and bcmp. If VARIANT is
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// defined, make sure to use the variants instead to make sure they are still
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// checked by the analyzer.
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// Some functions are implemented as builtins. These should be #defined as
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// BUILTIN(f), which will prepend "__builtin_" if USE_BUILTINS is defined.
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// Functions that have variants and are also available as builtins should be
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// declared carefully! See memcpy() for an example.
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#ifdef USE_BUILTINS
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# define BUILTIN(f) __builtin_ ## f
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#else /* USE_BUILTINS */
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# define BUILTIN(f) f
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#endif /* USE_BUILTINS */
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#define NULL 0
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typedef typeof(sizeof(int)) size_t;
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void clang_analyzer_eval(int);
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//===----------------------------------------------------------------------===
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// strnlen()
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//===----------------------------------------------------------------------===
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#define strnlen BUILTIN(strnlen)
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size_t strnlen(const char *s, size_t maxlen);
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void strnlen_liveness(const char *x) {
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if (strnlen(x, 10) < 5)
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return;
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clang_analyzer_eval(strnlen(x, 10) < 5); // expected-warning{{FALSE}}
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}
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void strnlen_subregion() {
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struct two_stringsn { char a[2], b[2]; };
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extern void use_two_stringsn(struct two_stringsn *);
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struct two_stringsn z;
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use_two_stringsn(&z);
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size_t a = strnlen(z.a, 10);
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z.b[0] = 5;
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size_t b = strnlen(z.a, 10);
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if (a == 0)
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clang_analyzer_eval(b == 0); // expected-warning{{TRUE}}
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use_two_stringsn(&z);
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size_t c = strnlen(z.a, 10);
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if (a == 0)
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clang_analyzer_eval(c == 0); // expected-warning{{UNKNOWN}}
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}
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extern void use_stringn(char *);
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void strnlen_argument(char *x) {
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size_t a = strnlen(x, 10);
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size_t b = strnlen(x, 10);
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if (a == 0)
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clang_analyzer_eval(b == 0); // expected-warning{{TRUE}}
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use_stringn(x);
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size_t c = strnlen(x, 10);
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if (a == 0)
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clang_analyzer_eval(c == 0); // expected-warning{{UNKNOWN}}
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}
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extern char global_strn[];
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void strnlen_global() {
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size_t a = strnlen(global_strn, 10);
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size_t b = strnlen(global_strn, 10);
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if (a == 0)
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clang_analyzer_eval(b == 0); // expected-warning{{TRUE}}
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// Call a function with unknown effects, which should invalidate globals.
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use_stringn(0);
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size_t c = strnlen(global_strn, 10);
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if (a == 0)
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clang_analyzer_eval(c == 0); // expected-warning{{UNKNOWN}}
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}
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void strnlen_indirect(char *x) {
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size_t a = strnlen(x, 10);
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char *p = x;
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char **p2 = &p;
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size_t b = strnlen(x, 10);
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if (a == 0)
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clang_analyzer_eval(b == 0); // expected-warning{{TRUE}}
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extern void use_stringn_ptr(char*const*);
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use_stringn_ptr(p2);
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size_t c = strnlen(x, 10);
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if (a == 0)
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clang_analyzer_eval(c == 0); // expected-warning{{UNKNOWN}}
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}
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