1 files changed, 101 insertions, 0 deletions
diff --git a/compiler-rt/test/msan/chained_origin_limits.cc b/compiler-rt/test/msan/chained_origin_limits.cc
new file mode 100644
index 00000000000..c6f8b626c59
--- /dev/null
+++ b/compiler-rt/test/msan/chained_origin_limits.cc
@@ -0,0 +1,101 @@
+// This test program creates a very large number of unique histories.
+
+// RUN: %clangxx_msan -fsanitize-memory-track-origins=2 -m64 -O3 %s -o %t
+
+// RUN: MSAN_OPTIONS=origin_history_size=7 not %run %t >%t.out 2>&1
+// RUN: FileCheck %s --check-prefix=CHECK7 < %t.out
+
+// RUN: MSAN_OPTIONS=origin_history_size=2 not %run %t >%t.out 2>&1
+// RUN: FileCheck %s --check-prefix=CHECK2 < %t.out
+
+// RUN: MSAN_OPTIONS=origin_history_per_stack_limit=1 not %run %t >%t.out 2>&1
+// RUN: FileCheck %s --check-prefix=CHECK-PER-STACK < %t.out
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+static char *buf, *cur, *end;
+void init() {
+  buf = new char[1000];
+  cur = buf;
+  end = buf + 1000;
+}
+
+void line_flush() {
+  char *p;
+  for (p = cur - 1; p >= buf; --p)
+    if (*p == '\n')
+      break;
+  if (p >= buf) {
+    size_t write_sz = p - buf + 1;
+    // write(2, buf, write_sz);
+    memmove(buf, p + 1, end - p - 1);
+    cur -= write_sz;
+  }
+}
+
+void buffered_write(const char *p, size_t sz) {
+  while (sz > 0) {
+    size_t copy_sz = end - cur;
+    if (sz < copy_sz) copy_sz = sz;
+    memcpy(cur, p, copy_sz);
+    cur += copy_sz;
+    sz -= copy_sz;
+    line_flush();
+  }
+}
+
+void fn1() {
+  buffered_write("a\n", 2);
+}
+
+void fn2() {
+  buffered_write("a\n", 2);
+}
+
+void fn3() {
+  buffered_write("a\n", 2);
+}
+
+int main(void) {
+  init();
+  for (int i = 0; i < 2000; ++i) {
+    fn1();
+    fn2();
+    fn3();
+  }
+  return buf[50];
+}
+
+// CHECK7: WARNING: MemorySanitizer: use-of-uninitialized-value
+// CHECK7-NOT: Uninitialized value was stored to memory at
+// CHECK7: Uninitialized value was stored to memory at
+// CHECK7-NOT: Uninitialized value was stored to memory at
+// CHECK7: Uninitialized value was stored to memory at
+// CHECK7-NOT: Uninitialized value was stored to memory at
+// CHECK7: Uninitialized value was stored to memory at
+// CHECK7-NOT: Uninitialized value was stored to memory at
+// CHECK7: Uninitialized value was stored to memory at
+// CHECK7-NOT: Uninitialized value was stored to memory at
+// CHECK7: Uninitialized value was stored to memory at
+// CHECK7-NOT: Uninitialized value was stored to memory at
+// CHECK7: Uninitialized value was stored to memory at
+// CHECK7-NOT: Uninitialized value was stored to memory at
+// CHECK7: Uninitialized value was created by a heap allocation
+
+// CHECK2: WARNING: MemorySanitizer: use-of-uninitialized-value
+// CHECK2-NOT: Uninitialized value was stored to memory at
+// CHECK2: Uninitialized value was stored to memory at
+// CHECK2-NOT: Uninitialized value was stored to memory at
+// CHECK2: Uninitialized value was created by a heap allocation
+
+// CHECK-PER-STACK: WARNING: MemorySanitizer: use-of-uninitialized-value
+// CHECK-PER-STACK: Uninitialized value was stored to memory at
+// CHECK-PER-STACK: in fn3
+// CHECK-PER-STACK: Uninitialized value was stored to memory at
+// CHECK-PER-STACK: in fn2
+// CHECK-PER-STACK: Uninitialized value was stored to memory at
+// CHECK-PER-STACK: in fn1
+// CHECK-PER-STACK: Uninitialized value was created by a heap allocation