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System/Libraries/Function.HC

@@ -0,0 +1,28 @@
+U0 @function_insert_call(U32 from, U32 to)
+{
+    *(from(U8*)) = 0xE8;
+    *((from + 1)(I32*)) = to - from - 5;
+}
+
+U0 @function_patch(U32 from, U32 to)
+{
+    *(from(U8*)) = 0xE9;
+    *((from + 1)(I32*)) = to - from - 5;
+}
+
+class @function
+{
+    U0(*InsertCall)
+    (U32 from, U32 to);
+    U0(*Patch)
+    (U32 from, U32 to);
+};
+
+@function Function;
+Function.InsertCall = &@function_insert_call;
+Function.Patch = &@function_patch;
+
+// usage: Function.InsertCall(addr, &func);
+// usage: Function.Patch(&old_func, &new_func);
+
+"function ";