Use a different heap start for test_vm_layout_compressed_pointer

src/util/memory.rs

@@ -303,6 +303,8 @@ pub fn get_process_memory_maps() -> String {
     data
 }
 
+/// Get the memory maps for the process. The returned string is a multi-line string.
+/// This is only meant to be used for debugging. For example, log process memory maps after detecting a clash.
 #[cfg(target_os = "macos")]
 pub fn get_process_memory_maps() -> String {
     // Get the current process ID (replace this with a specific PID if needed)

src/vm/tests/mock_tests/mock_test_vm_layout_compressed_pointer.rs

@@ -13,7 +13,12 @@ fn test_vm_layout_compressed_pointer() {
     with_mockvm(
         default_setup,
         || {
-            let start = 0x4000_0000;
+            let start = if cfg!(target_os = "macos") {
+                // Impossible to map 0x4000_0000 on maocOS. SO choose a different address.
+                0x60_0000_0000
+            } else {
+                0x4000_0000
+            };
             let heap_size = 1024 * 1024;
             let end = match start + heap_size {
                 end if end <= (4usize << 30) => 4usize << 30,