add protect-re.cpp
diff --git a/sample/protect-re.cpp b/sample/protect-re.cpp
new file mode 100644
index 0000000..6eaa863
--- /dev/null
+++ b/sample/protect-re.cpp
@@ -0,0 +1,70 @@
+#define XBYAK_NO_OP_NAMES
+#include <xbyak/xbyak.h>
+
+struct Code1 : Xbyak::CodeGenerator {
+ Code1()
+ : Xbyak::CodeGenerator(4096, Xbyak::DontSetProtectRWE)
+ {
+ mov(eax, 123);
+ ret();
+ }
+ void update()
+ {
+ db(0);
+ }
+};
+
+void test1(bool updateCode)
+{
+ Code1 c;
+ c.setProtectModeRE();
+ if (updateCode) c.update(); // segmentation fault
+ int (*f)() = c.getCode<int (*)()>();
+ printf("f=%d\n", f());
+
+ c.setProtectModeRW();
+ c.update();
+ puts("ok");
+}
+
+struct Code2 : Xbyak::CodeGenerator {
+ Code2()
+ : Xbyak::CodeGenerator(4096, Xbyak::AutoGrow)
+ {
+ mov(eax, 123);
+ ret();
+ }
+ void update()
+ {
+ db(0);
+ }
+};
+
+void test2(bool updateCode)
+{
+ Code2 c;
+ c.readyRE();
+ if (updateCode) c.update(); // segmentation fault
+ int (*f)() = c.getCode<int (*)()>();
+ printf("f=%d\n", f());
+
+ c.setProtectModeRW();
+ c.update();
+ puts("ok");
+}
+
+int main(int argc, char *argv[])
+{
+ if (argc < 2) {
+ fprintf(stderr, "%s <testNum> [update]\n", argv[0]);
+ return 0;
+ }
+ bool update = argc == 3;
+ int n = atoi(argv[1]);
+ printf("n=%d update=%d\n", n, update);
+ switch (n) {
+ case 1: test1(update); break;
+ case 2: test2(update); break;
+ default: fprintf(stderr, "no test %d\n", n); break;
+ }
+}
