This commit implements the Object Shapes technique in CRuby.

Object Shapes is used for accessing instance variables and representing the
"frozenness" of objects.  Object instances have a "shape" and the shape
represents some attributes of the object (currently which instance variables are
set and the "frozenness").  Shapes form a tree data structure, and when a new
instance variable is set on an object, that object "transitions" to a new shape
in the shape tree.  Each shape has an ID that is used for caching. The shape
structure is independent of class, so objects of different types can have the
same shape.

For example:

```ruby
class Foo
  def initialize
    # Starts with shape id 0
    @a = 1 # transitions to shape id 1
    @b = 1 # transitions to shape id 2
  end
end

class Bar
  def initialize
    # Starts with shape id 0
    @a = 1 # transitions to shape id 1
    @b = 1 # transitions to shape id 2
  end
end

foo = Foo.new # `foo` has shape id 2
bar = Bar.new # `bar` has shape id 2
```

Both `foo` and `bar` instances have the same shape because they both set
instance variables of the same name in the same order.

This technique can help to improve inline cache hits as well as generate more
efficient machine code in JIT compilers.

This commit also adds some methods for debugging shapes on objects.  See
`RubyVM::Shape` for more details.

For more context on Object Shapes, see [Feature: #18776]

Co-Authored-By: Aaron Patterson <tenderlove@ruby-lang.org>
Co-Authored-By: Eileen M. Uchitelle <eileencodes@gmail.com>
Co-Authored-By: John Hawthorn <john@hawthorn.email>

1 files changed, 11 insertions, 15 deletions

diff --git a/compile.c b/compile.c
index a5da919c0a..01f6abe6bc 100644
--- a/compile.c
+++ b/compile.c
@@ -2058,20 +2058,7 @@ cdhash_set_label_i(VALUE key, VALUE val, VALUE ptr)
 static inline VALUE
 get_ivar_ic_value(rb_iseq_t *iseq,ID id)
 {
-    VALUE val;
-    struct rb_id_table *tbl = ISEQ_COMPILE_DATA(iseq)->ivar_cache_table;
-    if (tbl) {
-        if (rb_id_table_lookup(tbl,id,&val)) {
-            return val;
-        }
-    }
-    else {
-        tbl = rb_id_table_create(1);
-        ISEQ_COMPILE_DATA(iseq)->ivar_cache_table = tbl;
-    }
-    val = INT2FIX(ISEQ_BODY(iseq)->ivc_size++);
-    rb_id_table_insert(tbl,id,val);
-    return val;
+    return INT2FIX(ISEQ_BODY(iseq)->ivc_size++);
 }
 
 static inline VALUE
@@ -2472,9 +2459,13 @@ iseq_set_sequence(rb_iseq_t *iseq, LINK_ANCHOR *const anchor)
                             generated_iseq[code_index + 1 + j] = (VALUE)ic;
                         }
                         break;
+		      case TS_IVC: /* inline ivar cache */
+                        {
+                            unsigned int ic_index = FIX2UINT(operands[j]);
+                            vm_ic_attr_index_initialize(((IVC)&body->is_entries[ic_index]), INVALID_SHAPE_ID);
+                        }
                       case TS_ISE: /* inline storage entry: `once` insn */
                       case TS_ICVARC: /* inline cvar cache */
-                      case TS_IVC: /* inline ivar cache */
                         {
                             unsigned int ic_index = FIX2UINT(operands[j]);
                             IC ic = &ISEQ_IS_ENTRY_START(body, type)[ic_index].ic_cache;
@@ -11514,6 +11505,11 @@ ibf_load_code(const struct ibf_load *load, rb_iseq_t *iseq, ibf_offset_t bytecod
 
                     ISE ic = ISEQ_IS_ENTRY_START(load_body, operand_type) + op;
                     code[code_index] = (VALUE)ic;
+
+                    if (operand_type == TS_IVC) {
+                        vm_ic_attr_index_initialize(((IVC)code[code_index]), INVALID_SHAPE_ID);
+                    }
+
                 }
                 break;
               case TS_CALLDATA: