Testing different stack pointers

src/GC/tests/stack.cpp

@@ -3,13 +3,32 @@
 #include <iostream>
 #include <vector>
 
+/*
+ *  Stack.cpp
+ *  - Tests stack scanning and stack pointers
+ *  
+ *  Goal:   Find the values of the following variables
+ *          and their position on the stack
+ *          - unsigned long a
+ *          - unsigned long b
+ *          - unsigned long global_1
+ *          - unsigned long global_2
+ * 
+ *  Result: Passed
+*/
+
+
+
+
 std::vector<uintptr_t *> iv;
 
 void collect() {
     std::cout << "in collect" << std::endl;
 
     uintptr_t *stack_start = reinterpret_cast<uintptr_t *>(__builtin_frame_address(0));
-    // uintptr_t *stack_end = reinterpret_cast<uintptr_t *>(__builtin_frame_address(100));
+
+    // denna orsakar segfault om man ger __b_f_a ett värde större än 2
+    // uintptr_t *stack_end = reinterpret_cast<uintptr_t *>(__builtin_frame_address(100)); 
 
     std::cout << "SP1:\t" << stack_start << "\nSP2:\t" << (stack_start - 1*sizeof(int)) << std::endl;
     std::cout << "SP-:\t" << --stack_start << std::endl;

src/GC/tests/stack2.cpp

@@ -0,0 +1,44 @@
+#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"<< prev1 - tmp << 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" << prev1 - tmp << std::endl;
+    
+    dummy1();
+
+    return 0;
+}
+
+void dummy1() {
+    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;
+    dummy2();
+    std::cout << "D1 RA:\t\t" << std::hex << __builtin_return_address(0) << std::endl;
+}
+
+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;
+    std::cout << "D2 ERA:\t\t" << std::hex << __builtin_extract_return_addr(ra) << std::endl;
+}