WIP: fix a bunch of small bugs

Author: tekknolagi

zjit/src/codegen.rs

@@ -466,21 +466,25 @@ fn gen_call_method(
     state: &FrameState,
 ) -> Option<Opnd> {
     // Don't push recv; it is passed in separately.
+    asm_comment!(asm, "make stack-allocated array of {} args", args.len());
     for &arg in args.iter().rev() {
         asm.cpush(jit.get_opnd(arg)?);
     }
     // Save PC for GC
     gen_save_pc(asm, state);
     // Call rb_zjit_vm_call0_no_splat, which will push a frame
-    asm_comment!(asm, "call rb_zjit_vm_call0_no_splat");
     // TODO(max): Figure out if we need to manually handle stack alignment and how to do it
     let call_info = unsafe { rb_get_call_data_ci(cd) };
     let method_id = unsafe { rb_vm_ci_mid(call_info) };
+    asm_comment!(asm, "get stack pointer");
+    let sp = asm.lea(Opnd::mem(VALUE_BITS, NATIVE_STACK_PTR, 0));
+    asm_comment!(asm, "call rb_zjit_vm_call0_no_splat");
     let result = asm.ccall(
         rb_zjit_vm_call0_no_splat as *const u8,
-        vec![EC, recv, Opnd::UImm(method_id.0), Opnd::UImm(args.len().try_into().unwrap()), NATIVE_STACK_PTR, callable],
+        vec![EC, recv, Opnd::UImm(method_id.0), Opnd::UImm(args.len().try_into().unwrap()), sp, callable],
     );
     // Pop all the args off the stack
+    asm_comment!(asm, "clear stack-allocated array of {} args", args.len());
     let new_sp = asm.add(NATIVE_STACK_PTR, (args.len()*SIZEOF_VALUE).into());
     asm.mov(NATIVE_STACK_PTR, new_sp);
     Some(result)