# Fixes a memory leak in WASI builds of Ruby where VM jump buffers are sometimes not freed.

--- a/eval_intern.h
+++ b/eval_intern.h
@@ -163,6 +163,18 @@ rb_ec_tag_jump(const rb_execution_context_t *ec, enum ruby_tag_type st)
 {
     RUBY_ASSERT(st != TAG_NONE);
     ec->tag->state = st;
+
+#if defined(__wasm__) && !defined(__EMSCRIPTEN__)
+    /* Destroy all the jump buffers that belong to tags between the current tag
+     * and the tag we're jumping to, since jump buffers are allocated on the
+     * heap on this platform instead of on the stack like on most other
+     * platforms. */
+    for (struct rb_vm_tag *tag = GET_EC()->tag; tag != ec->tag; tag = tag->prev) {
+        RUBY_ASSERT(tag != NULL);
+        rb_vm_tag_jmpbuf_deinit(&tag->buf);
+    }
+#endif
+
     ruby_longjmp(RB_VM_TAG_JMPBUF_GET(ec->tag->buf), 1);
 }
 
--- a/signal.c
+++ b/signal.c
@@ -849,6 +849,7 @@ check_stack_overflow(int sig, const uintptr_t addr, const ucontext_t *ctx)
              * otherwise it can cause stack overflow again at the same
              * place. */
             if ((crit = (!ec->tag->prev || !--uplevel)) != FALSE) break;
+            rb_vm_tag_jmpbuf_deinit(&ec->tag->buf);
             ec->tag = ec->tag->prev;
         }
         reset_sigmask(sig);
--- a/vm.c
+++ b/vm.c
@@ -2729,6 +2729,7 @@ vm_exec_handle_exception(rb_execution_context_t *ec, enum ruby_tag_type state, V
             if (VM_FRAME_FINISHED_P(ec->cfp)) {
                 rb_vm_pop_frame(ec);
                 ec->errinfo = (VALUE)err;
+                rb_vm_tag_jmpbuf_deinit(&ec->tag->buf);
                 ec->tag = ec->tag->prev;
                 EC_JUMP_TAG(ec, state);
             }
--- a/vm_trace.c
+++ b/vm_trace.c
@@ -455,6 +455,7 @@ rb_exec_event_hooks(rb_trace_arg_t *trace_arg, rb_hook_list_t *hooks, int pop_p)
             if (state) {
                 if (pop_p) {
                     if (VM_FRAME_FINISHED_P(ec->cfp)) {
+                        rb_vm_tag_jmpbuf_deinit(&ec->tag->buf);
                         ec->tag = ec->tag->prev;
                     }
                     rb_vm_pop_frame(ec);