Yoinked over the garbage collector.

src/GC/tests/stack2.cpp

@@ -0,0 +1,51 @@
+#include <cstring>
+#include <iostream>
+
+void dummy1();
+void dummy2();
+
+int main() {
+    
+    uintptr_t *prev1 = reinterpret_cast<uintptr_t *>(__builtin_frame_address(0));
+    uintptr_t *prev2 = static_cast<uintptr_t *>(__builtin_frame_address(0));
+
+    std::cout << "reinterpret:\t" << prev1 << "\nstatic:\t\t" << prev2 << std::endl;
+
+    std::cout << "Start:\t\t" << prev1 << std::endl;
+#pragma clang diagnostic ignored "-Wframe-address"
+    uintptr_t *tmp = reinterpret_cast<uintptr_t *>(__builtin_frame_address(1));
+    std::cout << "Frame 1:\t" << tmp << "\t\tDiff:\t" << std::hex << "0x"<< tmp - prev1 << std::endl;
+    prev1 = tmp;
+
+#pragma clang diagnostic ignored "-Wframe-address"
+    tmp = reinterpret_cast<uintptr_t *>(__builtin_frame_address(2));
+    std::cout << "Frame 2:\t" << tmp << "\tDiff:\t" << std::hex << "0x" << tmp - prev1 << std::endl;
+    prev1 = tmp;
+
+// arg > 2 for __builtin_frame_address() results in segfault
+// #pragma clang diagnostic ignored "-Wframe-address"
+//     tmp = reinterpret_cast<uintptr_t *>(__builtin_frame_address(3));
+//     std::cout << "Frame 3:\t" << tmp << "\tDiff:\t" << std::hex << "0x" << prev1 - tmp << std::endl;
+    
+    dummy1();
+
+    return 0;
+}
+
+void dummy1() {
+    std::cout << "D1 SFrame:\t" << __builtin_frame_address(0);
+#pragma clang diagnostic ignored "-Wframe-address"
+    std::cout << "\t\tPrev:\t" << __builtin_frame_address(1) << std::endl;
+    std::cout << "D1 RA:\t\t" << std::hex << __builtin_return_address(0) << std::endl;
+    dummy2();
+}
+
+void dummy2() {
+    std::cout << "Frame:\t\t" << __builtin_frame_address(0);
+#pragma clang diagnostic ignored "-Wframe-address"
+    std::cout << "\t\tPrev:\t" << __builtin_frame_address(1) << std::endl;
+    void *ra = __builtin_return_address(0);
+    std::cout << "D2 RA:\t\t" << std::hex << ra << std::endl;
+    // gives same value as pure 'ra'
+    // std::cout << "D2 ERA:\t\t" << std::hex << __builtin_extract_return_addr(ra) << std::endl;
+}