forked from OSchip/llvm-project
52 lines
1.5 KiB
C++
52 lines
1.5 KiB
C++
// RUN: %clang_cc1 -analyze -analyzer-checker=core %s -verify
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// expected-no-diagnostics
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namespace PR14054_reduced {
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struct Definition;
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struct ParseNode {
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union {
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Definition *lexdef;
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ParseNode *data;
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} pn_u;
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};
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struct Definition : public ParseNode { };
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void CloneParseTree(ParseNode *opn, ParseNode *pn, ParseNode *x) {
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// This used to cause an assertion failure because:
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// 1. The implicit operator= for unions assigns all members of the union,
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// not just the active one (b/c there's no way to know which is active).
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// 2. RegionStore dutifully stored all the variants at the same offset;
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// the last one won.
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// 3. We asked for the value of the first variant but got back a conjured
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// symbol for the second variant.
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// 4. We ended up trying to add a base cast to a region of the wrong type.
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//
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// Now (at the time this test was added), we instead treat all variants of
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// a union as different offsets, but only allow one to be active at a time.
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*pn = *opn;
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x = pn->pn_u.lexdef->pn_u.lexdef;
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}
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}
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namespace PR14054_original {
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struct Definition;
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struct ParseNode {
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union {
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struct {
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union {};
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Definition *lexdef;
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} name;
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class {
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int *target;
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ParseNode *data;
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} xmlpi;
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} pn_u;
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};
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struct Definition : public ParseNode { };
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void CloneParseTree(ParseNode *opn, ParseNode *pn, ParseNode *x) {
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pn->pn_u = opn->pn_u;
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x = pn->pn_u.name.lexdef->pn_u.name.lexdef;
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}
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}
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