e3e9082b01
Prior to this patch when the analyzer encountered a non-POD 0 length array, it still invoked the constructor for 1 element, which lead to false positives. This patch makes sure that we no longer construct any elements when we see a 0 length array. Differential Revision: https://reviews.llvm.org/D131501
59 lines
1.4 KiB
C++
59 lines
1.4 KiB
C++
// RUN: %clang_analyze_cc1 -analyzer-checker=core,debug.ExprInspection -std=c++11 -verify %s
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// RUN: %clang_analyze_cc1 -analyzer-checker=core,debug.ExprInspection -std=c++17 -verify %s
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#include "Inputs/system-header-simulator-cxx.h"
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void clang_analyzer_eval(bool);
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struct S
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{
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static int c;
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static int d;
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int x;
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S() { x = c++; }
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~S() { d++; }
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};
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int S::c = 0;
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int S::d = 0;
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struct Flex
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{
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int length;
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S contents[0];
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};
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void flexibleArrayMember()
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{
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S::c = 0;
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S::d = 0;
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const int size = 4;
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Flex *arr =
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(Flex *)::operator new(__builtin_offsetof(Flex, contents) + sizeof(S) * size);
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clang_analyzer_eval(S::c == 0); // expected-warning{{TRUE}}
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new (&arr->contents[0]) S;
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new (&arr->contents[1]) S;
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new (&arr->contents[2]) S;
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new (&arr->contents[3]) S;
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clang_analyzer_eval(S::c == size); // expected-warning{{TRUE}}
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clang_analyzer_eval(arr->contents[0].x == 0); // expected-warning{{TRUE}}
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clang_analyzer_eval(arr->contents[1].x == 1); // expected-warning{{TRUE}}
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clang_analyzer_eval(arr->contents[2].x == 2); // expected-warning{{TRUE}}
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clang_analyzer_eval(arr->contents[3].x == 3); // expected-warning{{TRUE}}
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arr->contents[0].~S();
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arr->contents[1].~S();
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arr->contents[2].~S();
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arr->contents[3].~S();
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::operator delete(arr);
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clang_analyzer_eval(S::d == size); // expected-warning{{TRUE}}
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}
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