Tie lifetime of uJIT blocks to iseqs

* Tie lifetime of uJIT blocks to iseqs

   Blocks weren't being freed when iseqs are collected.

* Add rb_dary. Use it for method dependency table

* Keep track of blocks per iseq

  Remove global version_tbl

* Block version bookkeeping fix

* dary -> darray

* free ujit_blocks

* comment about size of ujit_blocks

darray.h

@@ -0,0 +1,141 @@
+#ifndef RUBY_DARRAY_H
+#define RUBY_DARRAY_H
+
+#include <stdint.h>
+#include <stddef.h>
+#include <stdlib.h>
+
+// Type for a dynamic array. Use to declare a dynamic array.
+// It is a pointer so it fits in st_table nicely. Designed
+// to be fairly type-safe.
+//
+// NULL is a valid empty dynamic array.
+//
+// Example:
+//      rb_darray(char) char_array = NULL;
+//      if (!rb_darray_append(&char_array, 'e')) abort();
+//      printf("pushed %c\n", *rb_darray_ref(char_array, 0));
+//      rb_darray_free(char_array);
+//
+#define rb_darray(T) struct { rb_darray_meta_t meta; T data[]; } *
+
+// Copy an element out of the array. Warning: not bounds checked.
+//
+// T rb_darray_get(rb_darray(T) ary, int32_t idx);
+//
+#define rb_darray_get(ary, idx) ((ary)->data[(idx)])
+
+// Assign to an element. Warning: not bounds checked.
+//
+// void rb_darray_set(rb_darray(T) ary, int32_t idx, T element);
+//
+#define rb_darray_set(ary, idx, element) ((ary)->data[(idx)] = (element))
+
+// Get a pointer to an element. Warning: not bounds checked.
+//
+// T *rb_darray_ref(rb_darray(T) ary, int32_t idx);
+//
+#define rb_darray_ref(ary, idx) (&((ary)->data[(idx)]))
+
+// Copy a new element into the array. Return 1 on success and 0 on failure.
+// ptr_to_ary is evaluated multiple times.
+//
+// bool rb_darray_append(rb_darray(T) *ptr_to_ary, T element);
+//
+#define rb_darray_append(ptr_to_ary, element) ( \
+    rb_darray_ensure_space((ptr_to_ary)) ? (    \
+        rb_darray_set(*(ptr_to_ary),         \
+                    (*(ptr_to_ary))->meta.size, \
+                    (element)),            \
+        ++((*(ptr_to_ary))->meta.size),       \
+        1                                     \
+    ) : 0)
+
+// Iterate over items of the array in a for loop
+//
+#define rb_darray_foreach(ary, idx_name, elem_ptr_var) \
+    for (int idx_name = 0; idx_name < rb_darray_size(ary) && ((elem_ptr_var) = rb_darray_ref(ary, idx_name)); ++idx_name)
+
+typedef struct rb_darray_meta {
+    int32_t size;
+    int32_t capa;
+} rb_darray_meta_t;
+
+// Get the size of the dynamic array.
+//
+static inline int32_t
+rb_darray_size(const void *ary)
+{
+    const rb_darray_meta_t *meta = ary;
+    return meta ? meta->size : 0;
+}
+
+// Get the capacity of the dynamic array.
+//
+static inline int32_t
+rb_darray_capa(const void *ary)
+{
+    const rb_darray_meta_t *meta = ary;
+    return meta ? meta->capa : 0;
+}
+
+// Free the dynamic array.
+//
+static inline void
+rb_darray_free(void *ary)
+{
+    free(ary);
+}
+
+// Remove the last element of the array.
+//
+#define rb_darray_pop_back(ary) ((ary)->meta.size--)
+
+// Internal macro
+// Ensure there is space for one more element. Return 1 on success and 0 on failure.
+// `ptr_to_ary` is evaluated multiple times.
+#define rb_darray_ensure_space(ptr_to_ary) ( \
+    (rb_darray_capa(*(ptr_to_ary)) > rb_darray_size(*(ptr_to_ary))) ? \
+        1 : \
+        rb_darray_double(ptr_to_ary, sizeof((*(ptr_to_ary))->data[0])))
+
+// Internal function
+static inline int 
+rb_darray_double(void *ptr_to_ary, size_t element_size)
+{
+    rb_darray_meta_t **ptr_to_ptr_to_meta = ptr_to_ary;
+    const rb_darray_meta_t *meta = *ptr_to_ptr_to_meta;
+    int32_t current_capa = rb_darray_capa(meta);
+
+    int32_t new_capa;
+    // Calculate new capacity
+    if (current_capa == 0) {
+        new_capa = 1;
+    }
+    else {
+        int64_t doubled = 2 * (int64_t)current_capa;
+        new_capa = (int32_t)doubled;
+        if (new_capa != doubled) return 0;
+    }
+
+    // Calculate new buffer size
+    size_t current_buffer_size = element_size * (size_t)current_capa + (meta ? sizeof(*meta) : 0);
+    size_t new_buffer_size = element_size * (size_t)new_capa + sizeof(*meta);
+    if (new_buffer_size <= current_buffer_size) return 0;
+
+    rb_darray_meta_t *doubled_ary = realloc(*ptr_to_ptr_to_meta, new_buffer_size);
+    if (!doubled_ary) return 0;
+
+    if (meta == NULL) {
+        // First allocation. Initialize size. On subsequence allocations
+        // realloc takes care of carrying over the size.
+        doubled_ary->size = 0;
+    }
+
+    doubled_ary->capa = new_capa;
+
+    *ptr_to_ptr_to_meta = doubled_ary;
+    return 1;
+}
+
+#endif /* RUBY_DARRAY_H */