[ruby-cvs:78235] 71fee9bc72 (master): vm_invoke_builtin_delegate with start index.

Koichi Sasada	2019-11-15 17:49:49 +0900 (Fri, 15 Nov 2019)

  New Revision: 71fee9bc72

  https://github.com/ruby/ruby/commit/71fee9bc72

  Log:
    vm_invoke_builtin_delegate with start index.
    
    opt_invokebuiltin_delegate and opt_invokebuiltin_delegate_leave
    invokes builtin functions with same parameters of the method.
    This technique eliminate stack push operations. However, delegation
    parameters should be completely same as given parameters.
    (e.g. `def foo(a, b, c) __builtin_foo(a, b, c)` is okay, but
    __builtin_foo(b, c) is not allowed)
    
    This patch relaxes this restriction. ISeq has a local variables
    table which includes parameters. For example, the method defined
    as `def foo(a, b, c) x=y=nil`, then local variables table contains
    [a, b, c, x, y]. If calling builtin-function with arguments which
    are sub-array of the lvar table, use opt_invokebuiltin_delegate
    instruction with start index. For example, `__builtin_foo(b, c)`,
    `__builtin_bar(c, x, y)` is okay, and so on.

  Modified files:
    compile.c
    insns.def
    mini_builtin.c
    vm_insnhelper.c