__builtin_inline!

Add an experimental `__builtin_inline!(c_expression)` special intrinsic
which run a C code snippet.
In `c_expression`, you can access the following variables:
  * ec (rb_execution_context_t *)
  * self (const VALUE)
  * local variables (const VALUE)
Not that you can read these variables, but you can not write them.
You need to return from this expression and return value will be a
result of __builtin_inline!().

Examples:
  `def foo(x) __builtin_inline!('return rb_p(x);'); end` calls `p(x)`.
  `def double(x) __builtin_inline!('return INT2NUM(NUM2INT(x) * 2);')`
  returns x*2.

1 files changed, 1 insertions, 0 deletions

diff --git a/vm_core.h b/vm_core.h
index 9e158df923..9c5b723d6a 100644
--- a/vm_core.h
+++ b/vm_core.h
@@ -652,6 +652,7 @@ typedef struct rb_vm_struct {
     st_table *frozen_strings;
 
     const struct rb_builtin_function *builtin_function_table;
+    int builtin_inline_index;
 
     /* params */
     struct { /* size in byte */