test: add leak checker to all tests

test/shared/leak-check.c

@@ -0,0 +1,40 @@
+#include <crtdbg.h>
+#include <stdlib.h>
+
+#include "test-util.h"
+
+#if defined(_MSC_VER) /* msvc */
+#pragma section(".CRT$XCU", read)
+#define constructor(fn)                                              \
+  static void __cdecl fn(void);                                      \
+  __declspec(allocate(".CRT$XCU")) void(__cdecl * fn##_)(void) = fn; \
+  static void __cdecl fn(void)
+#else /* gcc/clang */
+#define constructor(fn)                              \
+  static void fn(void) __attribute__((constructor)); \
+  static void fn(void)
+#endif
+
+static void __cdecl leak_check_finalize(void);
+
+constructor(leak_check_init) {
+  /* Enable leak checking. */
+  _CrtSetDbgFlag(_CRTDBG_ALLOC_MEM_DF);
+
+  /* Write diagnostics to stderr. */
+  _CrtSetReportMode(_CRT_WARN, _CRTDBG_MODE_FILE);
+  _CrtSetReportFile(_CRT_WARN, _CRTDBG_FILE_STDERR);
+  _CrtSetReportMode(_CRT_ERROR, _CRTDBG_MODE_FILE);
+  _CrtSetReportFile(_CRT_ERROR, _CRTDBG_FILE_STDERR);
+  _CrtSetReportMode(_CRT_ASSERT, _CRTDBG_MODE_FILE);
+  _CrtSetReportFile(_CRT_ASSERT, _CRTDBG_FILE_STDERR);
+
+  /* Register the finalization function to run when the program exits. */
+  atexit(leak_check_finalize);
+}
+
+void leak_check_finalize(void) {
+  /* Check if there were memory leaks. */
+  int leaks_found = _CrtDumpMemoryLeaks();
+  check(!leaks_found);
+}