File: transparent_union_bug.c

package info (click to toggle)
llvm-toolchain-13 1%3A13.0.1-11
  • links: PTS, VCS
  • area: main
  • in suites: bookworm
  • size: 1,418,840 kB
  • sloc: cpp: 5,290,826; ansic: 996,570; asm: 544,593; python: 188,212; objc: 72,027; lisp: 30,291; f90: 25,395; sh: 24,898; javascript: 9,780; pascal: 9,398; perl: 7,484; ml: 5,432; awk: 3,523; makefile: 2,913; xml: 953; cs: 573; fortran: 539
file content (40 lines) | stat: -rw-r--r-- 805 bytes parent folder | download | duplicates (6) 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
 
// RUN: %clang_analyze_cc1 -analyze -triple x86_64-apple-darwin10 \
// RUN:  -analyzer-checker=core,debug.ExprInspection -verify %s

void clang_analyzer_warnIfReached();

typedef struct {
  int value;
} Struct;

typedef union {
  Struct *ptr;
  long num;
} __attribute__((transparent_union)) Alias;

void foo(Struct *x);
void foo(Alias y) {
  if (y.ptr == 0) {
    // no-crash
  }
  clang_analyzer_warnIfReached(); // expected-warning{{REACHABLE}}
}
void foobar(long z);
void foobar(Alias z) {
  if (z.num != 42) {
    // no-crash
  }
  clang_analyzer_warnIfReached(); // expected-warning{{REACHABLE}}
}

void foobaz(Alias x) {
  if (x.ptr == 0) {
    // no-crash
  }
  clang_analyzer_warnIfReached(); // expected-warning{{REACHABLE}}
}
void bar(Struct arg) {
  foo(&arg);
  foobar(42);
  foobaz(&arg);
}