1 files changed, 38 insertions, 4 deletions
@@ -1,15 +1,49 @@
-/** ##skip -*- mode:c; style:ruby; coding: utf-8 -*-
+/* -*- mode:c; style:ruby; coding: utf-8 -*-
insns.def - YARV instruction definitions
created at: 04/01/01 01:17:55 JST
Copyright (C) 2004-2007 Koichi Sasada
+ Massive rewrite by @shyouhei in 2017.
- instruction comment
- : english description
+/* Some comments about this file's contents:
+ - The new format aims to be editable by C editor of your choice;
+ your mileage might vary of course.
+ - Each instructions are in following format:
+ (type operand, type operand, ..)
+ (pop_values, ..)
+ (return values ..)
+ // attr type name contents..
+ .. // insn body
+ - Unlike the old format which was line-oriented, you can now place
+ newlines and comments at liberal positions.
+ - `DEFINE_INSN` is a keyword.
+ - An instruction name must be a valid C identifier.
+ - Operands, pop values, return values are series of either variable
+ declarations, keyword `void`, or keyword `...`. They are much
+ like C function declarations.
+ - Attribute pragmas are optional, and can include arbitrary C
+ expressions. You can write anything there but as of writing,
+ attribute named sp_inc is supported.
+ - Attributes can access operands, but not stack (push/pop) variables.
+ - An instruction's body is a pure C block, copied verbatimly into
+ the generated C source code.
/* nop */