51 lines · cpp
1// RUN: %clang_analyze_cc1 -std=c++11 -analyzer-checker=alpha.clone.CloneChecker -analyzer-config alpha.clone.CloneChecker:MinimumCloneComplexity=10 -verify %s2 3// Tests that the complexity value of a macro expansion is about the same as4// the complexity value of a normal function call and the macro body doesn't5// influence the complexity. See the CloneSignature class in CloneDetection.h6// for more information about complexity values of clones.7 8#define MACRO_FOO(a, b) a > b ? -a * a : -b * b;9 10// First, manually apply MACRO_FOO and see if the code gets detected as a clone.11// This confirms that with the current configuration the macro body would be12// considered large enough to pass the MinimumCloneComplexity constraint.13 14int manualMacro(int a, int b) { // expected-warning{{Duplicate code detected}}15 return a > b ? -a * a : -b * b;16}17 18int manualMacroClone(int a, int b) { // expected-note{{Similar code here}}19 return a > b ? -a * a : -b * b;20}21 22// Now we actually use the macro to generate the same AST as above. They23// shouldn't be reported because the macros only slightly increase the complexity24// value and the resulting code will never pass the MinimumCloneComplexity25// constraint.26 27int macro(int a, int b) {28 return MACRO_FOO(a, b);29}30 31int macroClone(int a, int b) {32 return MACRO_FOO(a, b);33}34 35// So far we only tested that macros increase the complexity by a lesser amount36// than normal code. We also need to be sure this amount is not zero because37// we otherwise macro code would be 'invisible' for the CloneDetector.38// This tests that it is possible to increase the reach the minimum complexity39// by only using macros. This is only possible if the complexity value is bigger40// than zero.41 42#define NEG(A) -(A)43 44int nestedMacros() { // expected-warning{{Duplicate code detected}}45 return NEG(NEG(NEG(NEG(NEG(NEG(NEG(NEG(NEG(NEG(1))))))))));46}47 48int nestedMacrosClone() { // expected-note{{Similar code here}}49 return NEG(NEG(NEG(NEG(NEG(NEG(NEG(NEG(NEG(NEG(1))))))))));50}51