Upgrade gperftools to 2.9 for GCP/GMC/GMP/GMD. (#2247)

trunk/research/gperftools/heap-defense/heap_defense.cc

@@ -0,0 +1,30 @@
+//
+// Copyright (c) 2013-2021 Winlin
+//
+// SPDX-License-Identifier: MIT
+//
+/**
+@see: https://blog.csdn.net/win_lin/article/details/50461709
+config srs with gperf(to make gperftools):
+    ./configure --gperf=on --gmd=on --jobs=3
+to check mem corruption:
+    make && env TCMALLOC_PAGE_FENCE=1 ./heap_defense
+*/
+#include <stdio.h>
+
+void foo(char* buf) {
+    buf[16] = 0x0f;
+}
+
+void bar(char* buf) {
+    printf("buf[15]=%#x\n", (unsigned char)buf[15]);
+}
+
+int main(int argc, char** argv) {
+    char* buf = new char[16];
+    foo(buf);
+    bar(buf);
+
+    return 0;
+}
+