1 files changed, 175 insertions, 0 deletions
diff --git a/test/Analysis/dead-stores.c b/test/Analysis/dead-stores.c
new file mode 100644
index 0000000..c100344
--- /dev/null
+++ b/test/Analysis/dead-stores.c
@@ -0,0 +1,175 @@
+// RUN: clang-cc -analyze -warn-dead-stores -verify %s &&
+// RUN: clang-cc -analyze -checker-simple -analyzer-store=basic -analyzer-constraints=basic -warn-dead-stores -verify %s &&
+// RUN: clang-cc -analyze -checker-simple -analyzer-store=basic -analyzer-constraints=range -warn-dead-stores -verify %s &&
+// RUN: clang-cc -analyze -checker-cfref -analyzer-store=basic -analyzer-constraints=basic -warn-dead-stores -verify %s &&
+// RUN: clang-cc -analyze -checker-cfref -analyzer-store=basic -analyzer-constraints=range -warn-dead-stores -verify %s &&
+// RUN: clang-cc -analyze -checker-cfref -analyzer-store=region -analyzer-constraints=basic -warn-dead-stores -verify %s &&
+// RUN: clang-cc -analyze -checker-cfref -analyzer-store=region -analyzer-constraints=range -warn-dead-stores -verify %s
+
+void f1() {
+  int k, y;
+  int abc=1;
+  long idx=abc+3*5; // expected-warning {{never read}}
+}
+
+void f2(void *b) {
+ char *c = (char*)b; // no-warning
+ char *d = b+1; // expected-warning {{never read}}
+ printf("%s", c); // expected-warning{{implicitly declaring C library function 'printf' with type 'int (char const *, ...)'}} \
+ // expected-note{{please include the header <stdio.h> or explicitly provide a declaration for 'printf'}}
+}
+
+void f3() {
+  int r;
+  if ((r = f()) != 0) { // no-warning
+    int y = r; // no-warning
+    printf("the error is: %d\n", y);
+  }
+}
+
+void f4(int k) {
+  
+  k = 1;
+  
+  if (k)
+    f1();
+    
+  k = 2;  // expected-warning {{never read}}
+}
+
+void f5() {
+
+  int x = 4; // no-warning
+  int *p = &x; // expected-warning{{never read}}
+
+}
+
+int f6() {
+  
+  int x = 4;
+  ++x; // expected-warning{{never read}}
+  return 1;
+}
+
+int f7(int *p) {  
+  // This is allowed for defensive programming.
+  p = 0; // no-warning  
+  return 1;
+}
+
+int f8(int *p) {
+  extern int *baz();
+  if (p = baz()) // expected-warning{{Although the value}}
+    return 1;
+  return 0;
+}
+
+int f9() {
+  int x = 4;
+  x = x + 10; // expected-warning{{never read}}
+  return 1;
+}
+
+int f10() {
+  int x = 4;
+  x = 10 + x; // expected-warning{{never read}}
+  return 1;
+}
+
+int f11() {
+  int x = 4;
+  return x++; // expected-warning{{never read}}
+}
+
+int f11b() {
+  int x = 4;
+  return ((((++x)))); // no-warning
+}
+
+int f12a(int y) {
+  int x = y;  // expected-warning{{never read}}
+  return 1;
+}
+int f12b(int y) {
+  int x __attribute__((unused)) = y;  // no-warning
+  return 1;
+}
+
+// Filed with PR 2630.  This code should produce no warnings.
+int f13(void)
+{
+  int a = 1;
+  int b, c = b = a + a;
+
+  if (b > 0)
+    return (0);
+
+  return (a + b + c);
+}
+
+// Filed with PR 2763.
+int f14(int count) {
+  int index, nextLineIndex;
+  for (index = 0; index < count; index = nextLineIndex+1) {
+    nextLineIndex = index+1;  // no-warning
+    continue;
+  }
+  return index;
+}
+
+// Test case for <rdar://problem/6248086>
+void f15(unsigned x, unsigned y) {
+  int count = x * y;   // no-warning
+  int z[count];
+}
+
+int f16(int x) {
+  x = x * 2;
+  x = sizeof(int [x = (x || x + 1) * 2]) // expected-warning{{Although the value stored to 'x' is used}}
+      ? 5 : 8;
+  return x;
+}
+
+// Self-assignments should not be flagged as dead stores.
+int f17() {
+  int x = 1;
+  x = x; // no-warning
+}
+
+// <rdar://problem/6506065>
+// The values of dead stores are only "consumed" in an enclosing expression
+// what that value is actually used.  In other words, don't say "Although the value stored to 'x' is used...".
+int f18() {
+   int x = 0; // no-warning
+   if (1)
+      x = 10;  // expected-warning{{Value stored to 'x' is never read}}
+   while (1)
+      x = 10;  // expected-warning{{Value stored to 'x' is never read}}
+   do
+      x = 10;   // expected-warning{{Value stored to 'x' is never read}}
+   while (1);
+
+   return (x = 10); // expected-warning{{Although the value stored to 'x' is used in the enclosing expression, the value is never actually read from 'x'}}
+}
+
+// PR 3514: false positive `dead initialization` warning for init to global
+//  http://llvm.org/bugs/show_bug.cgi?id=3514
+extern const int MyConstant;
+int f19(void) {
+  int x = MyConstant;  // no-warning
+  x = 1;
+  return x;
+}
+
+int f19b(void) { // This case is the same as f19.
+  const int MyConstant = 0;
+  int x = MyConstant; // no-warning
+  x = 1;
+  return x;  
+}
+
+void f20(void) {
+  int x = 1; // no-warning
+#pragma unused(x)
+}
+