51 lines
2.0 KiB
C++
51 lines
2.0 KiB
C++
// RUN: %clang_analyze_cc1 -std=c++11 -analyzer-checker=alpha.clone.CloneChecker -analyzer-config alpha.clone.CloneChecker:MinimumCloneComplexity=10 -verify %s
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// Tests that the complexity value of a macro expansion is about the same as
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// the complexity value of a normal function call and the macro body doesn't
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// influence the complexity. See the CloneSignature class in CloneDetection.h
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// for more information about complexity values of clones.
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#define MACRO_FOO(a, b) a > b ? -a * a : -b * b;
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// First, manually apply MACRO_FOO and see if the code gets detected as a clone.
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// This confirms that with the current configuration the macro body would be
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// considered large enough to pass the MinimumCloneComplexity constraint.
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int manualMacro(int a, int b) { // expected-warning{{Duplicate code detected}}
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return a > b ? -a * a : -b * b;
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}
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int manualMacroClone(int a, int b) { // expected-note{{Similar code here}}
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return a > b ? -a * a : -b * b;
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}
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// Now we actually use the macro to generate the same AST as above. They
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// shouldn't be reported because the macros only slightly increase the complexity
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// value and the resulting code will never pass the MinimumCloneComplexity
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// constraint.
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int macro(int a, int b) {
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return MACRO_FOO(a, b);
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}
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int macroClone(int a, int b) {
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return MACRO_FOO(a, b);
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}
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// So far we only tested that macros increase the complexity by a lesser amount
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// than normal code. We also need to be sure this amount is not zero because
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// we otherwise macro code would be 'invisible' for the CloneDetector.
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// This tests that it is possible to increase the reach the minimum complexity
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// by only using macros. This is only possible if the complexity value is bigger
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// than zero.
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#define NEG(A) -(A)
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int nestedMacros() { // expected-warning{{Duplicate code detected}}
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return NEG(NEG(NEG(NEG(NEG(NEG(NEG(NEG(NEG(NEG(1))))))))));
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}
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int nestedMacrosClone() { // expected-note{{Similar code here}}
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return NEG(NEG(NEG(NEG(NEG(NEG(NEG(NEG(NEG(NEG(1))))))))));
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}
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