Add macOS support to test helpers and memory tests

- hip_test_helper.hh: Fix OS detection (#elif _WIN32 instead of #else),
  add macOS memory query via sysctlbyname
- hipMemcpy.cc: Add macOS memory query via sysctl/mach VM stats
- Exclude hipHmmOvrSubscriptionTst on Apple (uses Linux-specific IPC)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: pvelesko

tests/catch/include/hip_test_helper.hh

@@ -25,9 +25,11 @@ THE SOFTWARE.
 
 #ifdef __linux__
   #include <sys/sysinfo.h>
-#else
+#elif defined(_WIN32)
   #include <windows.h>
   #include <sysinfoapi.h>
+#elif defined(__APPLE__)
+  #include <sys/sysctl.h>
 #endif
 
 namespace HipTest {
@@ -48,6 +50,12 @@ static inline size_t getMemoryAmount() {
   statex.dwLength = sizeof(statex);
   GlobalMemoryStatusEx(&statex);
   return (statex.ullAvailPhys / (1024 * 1024));  // MB
+#elif defined(__APPLE__)
+  // Return total physical memory as a rough estimate
+  uint64_t memsize = 0;
+  size_t len = sizeof(memsize);
+  sysctlbyname("hw.memsize", &memsize, &len, nullptr, 0);
+  return memsize / (1024 * 1024);  // MB
 #endif
 }
 

tests/catch/unit/memory/CMakeLists.txt

@@ -176,7 +176,7 @@ endif()
 
 # skipped due to os related code in tests
 # need to work on them when all the tests are enabled
-if(UNIX)
+if(UNIX AND NOT APPLE)
     set(TEST_SRC ${TEST_SRC}
                  hipHmmOvrSubscriptionTst.cc
                  hipMemoryAllocateCoherent.cc)

tests/catch/unit/memory/hipMemcpy.cc

@@ -33,9 +33,12 @@ This testcase verifies following scenarios
 #ifdef _WIN32
 #define WIN32_LEAN_AND_MEAN
 #include <windows.h>
-#else
+#elif defined(__linux__)
 #include "sys/types.h"
 #include "sys/sysinfo.h"
+#elif defined(__APPLE__)
+#include <sys/sysctl.h>
+#include <mach/mach.h>
 #endif
 
 
@@ -177,6 +180,19 @@ void memcpytest2_get_host_memory(size_t *free, size_t *total) {
   *free = static_cast<size_t>(0.4 * status.ullAvailPhys);
   *total = static_cast<size_t>(0.4 * status.ullTotalPhys);
 }
+#elif defined(__APPLE__)
+void memcpytest2_get_host_memory(size_t  *free, size_t *total) {
+  uint64_t memsize = 0;
+  size_t len = sizeof(memsize);
+  sysctlbyname("hw.memsize", &memsize, &len, nullptr, 0);
+  *total = memsize;
+  // Approximate free memory using Mach VM stats
+  vm_statistics64_data_t vmstat;
+  mach_msg_type_number_t count = HOST_VM_INFO64_COUNT;
+  host_statistics64(mach_host_self(), HOST_VM_INFO64,
+                    reinterpret_cast<host_info64_t>(&vmstat), &count);
+  *free = static_cast<size_t>(vmstat.free_count) * vm_page_size;
+}
 #else
 struct sysinfo memInfo;
 void memcpytest2_get_host_memory(size_t  *free, size_t *total) {