File: symbol-escape.cpp

package info (click to toggle)
llvm-toolchain-17 1%3A17.0.6-22
  • links: PTS, VCS
  • area: main
  • in suites: forky, sid, trixie
  • size: 1,799,624 kB
  • sloc: cpp: 6,428,607; ansic: 1,383,196; asm: 793,408; python: 223,504; objc: 75,364; f90: 60,502; lisp: 33,869; pascal: 15,282; sh: 9,684; perl: 7,453; ml: 4,937; awk: 3,523; makefile: 2,889; javascript: 2,149; xml: 888; fortran: 619; cs: 573
file content (33 lines) | stat: -rw-r--r-- 1,005 bytes parent folder | download | duplicates (23) 
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
 
// RUN: %clang_analyze_cc1 \
// RUN:  -analyzer-checker=core,cplusplus.NewDeleteLeaks \
// RUN:  -verify %s

// expected-no-diagnostics: Whenever we cannot evaluate an operation we escape
//                          the operands. After the evaluation it would be an
//                          Unknown value and the tracking would be lost.

typedef unsigned __INTPTR_TYPE__ uintptr_t;

class C {};

C *simple_escape_in_bitwise_op(C *Foo) {
  C *Bar = new C();
  Bar = reinterpret_cast<C *>(reinterpret_cast<uintptr_t>(Bar) & 0x1);
  (void)Bar;
  // no-warning: "Potential leak of memory pointed to by 'Bar'" was here.

  return Bar;
}

C **indirect_escape_in_bitwise_op() {
  C *Qux = new C();
  C **Baz = &Qux;
  Baz = reinterpret_cast<C **>(reinterpret_cast<uintptr_t>(Baz) | 0x1);
  Baz = reinterpret_cast<C **>(reinterpret_cast<uintptr_t>(Baz) &
		               ~static_cast<uintptr_t>(0x1));
  // no-warning: "Potential leak of memory pointed to by 'Qux'" was here.

  delete *Baz;
  return Baz;
}