forked from OSchip/llvm-project
126 lines
5.7 KiB
C
126 lines
5.7 KiB
C
// RUN: %check_clang_tidy %s bugprone-macro-repeated-side-effects %t
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#define badA(x,y) ((x)+((x)+(y))+(y))
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void bad(int ret, int a, int b) {
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ret = badA(a++, b);
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// CHECK-NOTES: :[[@LINE-1]]:14: warning: side effects in the 1st macro argument 'x' are repeated in macro expansion [bugprone-macro-repeated-side-effects]
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// CHECK-NOTES: :[[@LINE-4]]:9: note: macro 'badA' defined here
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ret = badA(++a, b);
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// CHECK-NOTES: :[[@LINE-1]]:14: warning: side effects in the 1st macro argument 'x'
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// CHECK-NOTES: :[[@LINE-7]]:9: note: macro 'badA' defined here
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ret = badA(a--, b);
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// CHECK-NOTES: :[[@LINE-1]]:14: warning: side effects in the 1st macro argument 'x'
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// CHECK-NOTES: :[[@LINE-10]]:9: note: macro 'badA' defined here
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ret = badA(--a, b);
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// CHECK-NOTES: :[[@LINE-1]]:14: warning: side effects in the 1st macro argument 'x'
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// CHECK-NOTES: :[[@LINE-13]]:9: note: macro 'badA' defined here
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ret = badA(a, b++);
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// CHECK-NOTES: :[[@LINE-1]]:17: warning: side effects in the 2nd macro argument 'y'
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// CHECK-NOTES: :[[@LINE-16]]:9: note: macro 'badA' defined here
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ret = badA(a, ++b);
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// CHECK-NOTES: :[[@LINE-1]]:17: warning: side effects in the 2nd macro argument 'y'
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// CHECK-NOTES: :[[@LINE-19]]:9: note: macro 'badA' defined here
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ret = badA(a, b--);
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// CHECK-NOTES: :[[@LINE-1]]:17: warning: side effects in the 2nd macro argument 'y'
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// CHECK-NOTES: :[[@LINE-22]]:9: note: macro 'badA' defined here
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ret = badA(a, --b);
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// CHECK-NOTES: :[[@LINE-1]]:17: warning: side effects in the 2nd macro argument 'y'
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// CHECK-NOTES: :[[@LINE-25]]:9: note: macro 'badA' defined here
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}
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#define MIN(A,B) ((A) < (B) ? (A) : (B)) // single ?:
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#define LIMIT(X,A,B) ((X) < (A) ? (A) : ((X) > (B) ? (B) : (X))) // two ?:
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void question(int x) {
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MIN(x++, 12);
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// CHECK-NOTES: :[[@LINE-1]]:7: warning: side effects in the 1st macro argument 'A'
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// CHECK-NOTES: :[[@LINE-5]]:9: note: macro 'MIN' defined here
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MIN(34, x++);
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// CHECK-NOTES: :[[@LINE-1]]:11: warning: side effects in the 2nd macro argument 'B'
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// CHECK-NOTES: :[[@LINE-8]]:9: note: macro 'MIN' defined here
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LIMIT(x++, 0, 100);
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// CHECK-NOTES: :[[@LINE-1]]:9: warning: side effects in the 1st macro argument 'X'
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// CHECK-NOTES: :[[@LINE-10]]:9: note: macro 'LIMIT' defined here
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LIMIT(20, x++, 100);
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// CHECK-NOTES: :[[@LINE-1]]:13: warning: side effects in the 2nd macro argument 'A'
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// CHECK-NOTES: :[[@LINE-13]]:9: note: macro 'LIMIT' defined here
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LIMIT(20, 0, x++);
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// CHECK-NOTES: :[[@LINE-1]]:16: warning: side effects in the 3rd macro argument 'B'
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// CHECK-NOTES: :[[@LINE-16]]:9: note: macro 'LIMIT' defined here
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}
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// False positive: Repeated side effects is intentional.
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// It is hard to know when it's done by intention so right now we warn.
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#define UNROLL(A) {A A}
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void fp1(int i) {
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UNROLL({ i++; });
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// CHECK-NOTES: :[[@LINE-1]]:10: warning: side effects in the 1st macro argument 'A'
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// CHECK-NOTES: :[[@LINE-4]]:9: note: macro 'UNROLL' defined here
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}
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// Do not produce a false positive on a strchr() macro. Explanation; Currently the '?'
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// triggers the test to bail out, because it cannot evaluate __builtin_constant_p(c).
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# define strchrs(s, c) \
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(__extension__ (__builtin_constant_p (c) && !__builtin_constant_p (s) \
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&& (c) == '\0' \
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? (char *) __rawmemchr (s, c) \
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: __builtin_strchr (s, c)))
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char* __rawmemchr(char* a, char b) {
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return a;
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}
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void pass(char* pstr, char ch) {
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strchrs(pstr, ch++); // No error.
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}
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// Check large arguments (t=20, u=21).
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#define largeA(a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, x, y, z) \
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((a) + (a) + (b) + (b) + (c) + (c) + (d) + (d) + (e) + (e) + (f) + (f) + (g) + (g) + \
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(h) + (h) + (i) + (i) + (j) + (j) + (k) + (k) + (l) + (l) + (m) + (m) + (n) + (n) + \
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(o) + (o) + (p) + (p) + (q) + (q) + (r) + (r) + (s) + (s) + (t) + (t) + (u) + (u) + \
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(v) + (v) + (x) + (x) + (y) + (y) + (z) + (z))
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void large(int a) {
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largeA(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, a++, 0, 0, 0, 0, 0, 0);
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// CHECK-NOTES: :[[@LINE-1]]:64: warning: side effects in the 19th macro argument 's'
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// CHECK-NOTES: :[[@LINE-8]]:9: note: macro 'largeA' defined here
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largeA(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, a++, 0, 0, 0, 0, 0);
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// CHECK-NOTES: :[[@LINE-1]]:67: warning: side effects in the 20th macro argument 't'
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// CHECK-NOTES: :[[@LINE-11]]:9: note: macro 'largeA' defined here
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largeA(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, a++, 0, 0, 0, 0);
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// CHECK-NOTES: :[[@LINE-1]]:70: warning: side effects in the 21st macro argument 'u'
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// CHECK-NOTES: :[[@LINE-14]]:9: note: macro 'largeA' defined here
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}
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// Passing macro argument as argument to __builtin_constant_p and macros.
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#define builtinbad(x) (__builtin_constant_p(x) + (x) + (x))
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#define builtingood1(x) (__builtin_constant_p(x) + (x))
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#define builtingood2(x) ((__builtin_constant_p(x) && (x)) || (x))
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#define macrobad(x) (builtingood1(x) + (x) + (x))
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#define macrogood(x) (builtingood1(x) + (x))
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void builtins(int ret, int a) {
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ret += builtinbad(a++);
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// CHECK-NOTES: :[[@LINE-1]]:21: warning: side effects in the 1st macro argument 'x'
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// CHECK-NOTES: :[[@LINE-8]]:9: note: macro 'builtinbad' defined here
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ret += builtingood1(a++);
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ret += builtingood2(a++);
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ret += macrobad(a++);
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// CHECK-NOTES: :[[@LINE-1]]:19: warning: side effects in the 1st macro argument 'x'
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// CHECK-NOTES: :[[@LINE-12]]:9: note: macro 'macrobad' defined here
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ret += macrogood(a++);
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}
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// Bail out for conditionals.
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#define condB(x,y) if(x) {x=y;} else {x=y + 1;}
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void conditionals(int a, int b)
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{
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condB(a, b++);
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}
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void log(const char *s, int v);
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#define LOG(val) log(#val, (val))
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void test_log(int a) {
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LOG(a++);
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}
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