forked from OSchip/llvm-project
135 lines
2.2 KiB
C
135 lines
2.2 KiB
C
// RUN: clang -warn-dead-stores -verify %s &&
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// RUN: clang -checker-simple -warn-dead-stores -verify %s &&
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// RUN: clang -warn-dead-stores -checker-simple -verify %s
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void f1() {
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int k, y;
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int abc=1;
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long idx=abc+3*5; // expected-warning {{never read}}
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}
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void f2(void *b) {
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char *c = (char*)b; // no-warning
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char *d = b+1; // expected-warning {{never read}}
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printf("%s", c);
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}
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void f3() {
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int r;
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if ((r = f()) != 0) { // no-warning
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int y = r; // no-warning
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printf("the error is: %d\n", y);
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}
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}
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void f4(int k) {
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k = 1;
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if (k)
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f1();
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k = 2; // expected-warning {{never read}}
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}
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void f5() {
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int x = 4; // no-warning
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int *p = &x; // expected-warning{{never read}}
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}
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int f6() {
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int x = 4;
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++x; // expected-warning{{never read}}
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return 1;
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}
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int f7(int *p) {
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// This is allowed for defensive programming.
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p = 0; // no-warning
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return 1;
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}
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int f8(int *p) {
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extern int *baz();
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if (p = baz()) // expected-warning{{Although the value}}
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return 1;
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return 0;
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}
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int f9() {
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int x = 4;
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x = x + 10; // expected-warning{{never read}}
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return 1;
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}
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int f10() {
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int x = 4;
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x = 10 + x; // expected-warning{{never read}}
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return 1;
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}
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int f11() {
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int x = 4;
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return x++; // expected-warning{{never read}}
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}
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int f11b() {
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int x = 4;
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return ++x; // no-warning
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}
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int f12a(int y) {
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int x = y; // expected-warning{{never read}}
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return 1;
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}
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int f12b(int y) {
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int x __attribute__((unused)) = y; // no-warning
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return 1;
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}
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// Filed with PR 2630. This code should produce no warnings.
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int f13(void)
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{
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int a = 1;
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int b, c = b = a + a;
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if (b > 0)
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return (0);
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return (a + b + c);
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}
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// Filed with PR 2763.
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int f14(int count) {
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int index, nextLineIndex;
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for (index = 0; index < count; index = nextLineIndex+1) {
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nextLineIndex = index+1; // no-warning
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continue;
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}
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return index;
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}
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// Test case for <rdar://problem/6248086>
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void f15(unsigned x, unsigned y) {
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int count = x * y; // no-warning
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int z[count];
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}
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int f16(int x) {
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x = x * 2;
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x = sizeof(int [x = (x || x + 1) * 2]) // expected-warning{{Although the value stored to 'x' is used}}
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? 5 : 8;
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return x;
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}
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// Self-assignments should not be flagged as dead stores.
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int f17() {
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int x = 1;
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x = x; // no-warning
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}
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