5413aaa791
In this case, the value of 'x' may be changed after the call to indirectAccess:
struct Wrapper {
int *ptr;
};
void indirectAccess(const Wrapper &w);
void test() {
int x = 42;
Wrapper w = { x };
clang_analyzer_eval(x == 42); // TRUE
indirectAccess(w);
clang_analyzer_eval(x == 42); // UNKNOWN
}
This is important for modelling return-by-value objects in C++, to show
that the contents of the struct are escaping in the return copy-constructor.
<rdar://problem/13239826>
llvm-svn: 177570
92 lines
2.0 KiB
C++
92 lines
2.0 KiB
C++
// RUN: %clang_cc1 -analyze -analyzer-checker=core,debug.ExprInspection -verify %s
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void clang_analyzer_eval(bool);
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void usePointer(int * const *);
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void useReference(int * const &);
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void testPointer() {
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int x;
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int *p;
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p = &x;
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x = 42;
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clang_analyzer_eval(x == 42); // expected-warning{{TRUE}}
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usePointer(&p);
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clang_analyzer_eval(x == 42); // expected-warning{{UNKNOWN}}
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p = &x;
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x = 42;
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clang_analyzer_eval(x == 42); // expected-warning{{TRUE}}
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useReference(p);
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clang_analyzer_eval(x == 42); // expected-warning{{UNKNOWN}}
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int * const cp1 = &x;
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x = 42;
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clang_analyzer_eval(x == 42); // expected-warning{{TRUE}}
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usePointer(&cp1);
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clang_analyzer_eval(x == 42); // expected-warning{{UNKNOWN}}
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int * const cp2 = &x;
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x = 42;
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clang_analyzer_eval(x == 42); // expected-warning{{TRUE}}
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useReference(cp2);
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clang_analyzer_eval(x == 42); // expected-warning{{UNKNOWN}}
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}
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struct Wrapper {
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int *ptr;
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};
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void useStruct(Wrapper &w);
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void useConstStruct(const Wrapper &w);
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void testPointerStruct() {
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int x;
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Wrapper w;
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w.ptr = &x;
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x = 42;
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clang_analyzer_eval(x == 42); // expected-warning{{TRUE}}
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useStruct(w);
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clang_analyzer_eval(x == 42); // expected-warning{{UNKNOWN}}
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w.ptr = &x;
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x = 42;
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clang_analyzer_eval(x == 42); // expected-warning{{TRUE}}
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useConstStruct(w);
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clang_analyzer_eval(x == 42); // expected-warning{{UNKNOWN}}
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}
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struct RefWrapper {
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int &ref;
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};
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void useStruct(RefWrapper &w);
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void useConstStruct(const RefWrapper &w);
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void testReferenceStruct() {
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int x;
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RefWrapper w = { x };
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x = 42;
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clang_analyzer_eval(x == 42); // expected-warning{{TRUE}}
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useStruct(w);
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clang_analyzer_eval(x == 42); // expected-warning{{UNKNOWN}}
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}
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// FIXME: This test is split into two functions because region invalidation
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// does not preserve reference bindings. <rdar://problem/13320347>
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void testConstReferenceStruct() {
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int x;
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RefWrapper w = { x };
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x = 42;
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clang_analyzer_eval(x == 42); // expected-warning{{TRUE}}
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useConstStruct(w);
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clang_analyzer_eval(x == 42); // expected-warning{{UNKNOWN}}
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}
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