9a209ad1d8
r335795 adds copy elision information to CFG. This commit allows static analyzer to elide elidable copy constructors by constructing the objects that were previously subject to elidable copy directly in the target region of the copy. The chain of elided constructors may potentially be indefinitely long. This only happens when the object is being returned from a function which in turn is returned from another function, etc. NRVO is not supported yet. Differential Revision: https://reviews.llvm.org/D47671 llvm-svn: 335800
60 lines
2.1 KiB
C++
60 lines
2.1 KiB
C++
// RUN: %clang_analyze_cc1 -analyze -analyzer-checker core -analyzer-config cfg-temporary-dtors=true,c++-temp-dtor-inlining=true -analyzer-output=text -verify %s
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namespace test_simple_temporary {
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class C {
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int x;
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public:
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C(int x): x(x) {} // expected-note{{The value 0 is assigned to field 'x'}}
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~C() { x = 1 / x; } // expected-warning{{Division by zero}}
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// expected-note@-1{{Division by zero}}
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};
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void test() {
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C(0); // expected-note {{Passing the value 0 via 1st parameter 'x'}}
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// expected-note@-1{{Calling constructor for 'C'}}
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// expected-note@-2{{Returning from constructor for 'C'}}
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// expected-note@-3{{Calling '~C'}}
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}
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} // end namespace test_simple_temporary
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namespace test_lifetime_extended_temporary {
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class C {
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int x;
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public:
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C(int x): x(x) {} // expected-note{{The value 0 is assigned to field 'x'}}
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void nop() const {}
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~C() { x = 1 / x; } // expected-warning{{Division by zero}}
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// expected-note@-1{{Division by zero}}
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};
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void test(int coin) {
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// We'd divide by zero in the automatic destructor for variable 'c'.
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const C &c = coin ? C(1) : C(0); // expected-note {{Assuming 'coin' is 0}}
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// expected-note@-1{{'?' condition is false}}
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// expected-note@-2{{Passing the value 0 via 1st parameter 'x'}}
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// expected-note@-3{{Calling constructor for 'C'}}
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// expected-note@-4{{Returning from constructor for 'C'}}
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c.nop();
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} // expected-note{{Calling '~C'}}
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} // end namespace test_lifetime_extended_temporary
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namespace test_bug_after_dtor {
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int glob;
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class C {
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public:
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C() { glob += 1; }
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~C() { glob -= 2; } // expected-note{{The value 0 is assigned to 'glob'}}
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};
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void test() {
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glob = 1;
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C(); // expected-note {{Calling '~C'}}
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// expected-note@-1{{Returning from '~C'}}
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glob = 1 / glob; // expected-warning{{Division by zero}}
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// expected-note@-1{{Division by zero}}
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}
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} // end namespace test_bug_after_dtor
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