initial work on c++ gc support

1 files changed, 41 insertions, 0 deletions

diff --git a/system/include/gc.h b/system/include/gc.h
new file mode 100644
index 00000000..a4f7afbb
--- /dev/null
+++ b/system/include/gc.h
@@ -0,0 +1,41 @@
+/*
+ * Boehm-compatible GC API
+ */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+void __attribute__((used)) __GC_KEEPALIVE__() {
+  // Force inclusion of necessary dlmalloc functions
+  static times = 1;
+  void *x = malloc(times);
+  free(x);
+  x = calloc(times);
+  free(x);
+  times++;
+}
+
+/* Initialize. */
+void GC_INIT();
+
+/* Allocate memory. Cleared to 0 to erase all pointers. */
+void *GC_MALLOC(int bytes);
+
+/* Allocate memory for an object that the user promises will not contain pointers. */
+void *GC_MALLOC_ATOMIC(int bytes);
+
+/* Explicitly deallocate an object. Dangerous as it forces a free and does not check if the object is reffed. */
+void GC_FREE(void *ptr);
+
+/* Register a finalizer. func(ptr, arg) will be called. The old values are saved in old_func, old_arg */
+void GC_REGISTER_FINALIZER_NO_ORDER((void*)ptr, void (*func)(),      void *arg,
+                                                void *(*old_func)(), void *old_arg);
+
+/* Non-Boehm addition. Call this once per frame or such, it will collect if necessary */
+void GC_MAYBE_COLLECT();
+
+#ifdef __cplusplus
+}
+#endif
+