Define AST module under RubyVM [experimental]

* ext/-test-/ast/ast.c: Rename to ast.c
  and define AST module under RubyVM.
* common.mk: compile ast.c.
* ext/-test-/ast/extconf.rb: Don't need this file anymore.
* inits.c (rb_call_inits): Call Init_ast to setup AST module.
* test/-ext-/ast/test_ast.rb: Follow up the namespace change.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@63534 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ast.c

@@ -479,7 +479,7 @@ rb_ast_node_inspect(VALUE self)
 void
 Init_ast(void)
 {
-    rb_mAST = rb_define_module("AST");
+    rb_mAST = rb_define_module_under(rb_cRubyVM, "AST");
     rb_cNode = rb_define_class_under(rb_mAST, "Node", rb_cObject);
 
     rb_define_alloc_func(rb_cNode, rb_ast_node_alloc);

common.mk

@@ -75,6 +75,7 @@ MAKE_ENC      = -f $(ENC_MK) V="$(V)" UNICODE_HDR_DIR="$(UNICODE_HDR_DIR)" \
 		RUBY="$(MINIRUBY)" MINIRUBY="$(MINIRUBY)" $(mflags)
 
 COMMONOBJS    = array.$(OBJEXT) \
+		ast.$(OBJEXT) \
 		bignum.$(OBJEXT) \
 		class.$(OBJEXT) \
 		compar.$(OBJEXT) \
@@ -1445,6 +1446,12 @@ array.$(OBJEXT): {$(VPATH)}ruby_assert.h
 array.$(OBJEXT): {$(VPATH)}st.h
 array.$(OBJEXT): {$(VPATH)}subst.h
 array.$(OBJEXT): {$(VPATH)}util.h
+ast.$(OBJEXT): $(hdrdir)/ruby/ruby.h
+ast.$(OBJEXT): $(top_srcdir)/include/ruby.h
+ast.$(OBJEXT): {$(VPATH)}encoding.h
+ast.$(OBJEXT): {$(VPATH)}internal.h
+ast.$(OBJEXT): {$(VPATH)}node.h
+ast.$(OBJEXT): {$(VPATH)}vm_core.h
 bignum.$(OBJEXT): $(hdrdir)/ruby/ruby.h
 bignum.$(OBJEXT): $(top_srcdir)/include/ruby.h
 bignum.$(OBJEXT): {$(VPATH)}bignum.c

ext/-test-/ast/extconf.rb

@@ -1,3 +0,0 @@
-# frozen_string_literal: false
-require_relative "../auto_ext.rb"
-auto_ext(inc: true)

inits.c

@@ -61,5 +61,6 @@ rb_call_inits(void)
     CALL(Complex);
     CALL(version);
     CALL(vm_trace);
+    CALL(ast);
 }
 #undef CALL

test/-ext-/ast/test_ast.rb

@@ -1,38 +1,39 @@
 # frozen_string_literal: false
 require 'test/unit'
-require "-test-/ast"
 
-module AST
-  class Node
-    class CodePosition
-      include Comparable
-      attr_reader :lineno, :column
-      def initialize(lineno, column)
-        @lineno = lineno
-        @column = column
-      end
+class RubyVM
+  module AST
+    class Node
+      class CodePosition
+        include Comparable
+        attr_reader :lineno, :column
+        def initialize(lineno, column)
+          @lineno = lineno
+          @column = column
+        end
 
-      def <=>(other)
-        case
-        when lineno < other.lineno
-          -1
-        when lineno == other.lineno
-          column <=> other.column
-        when lineno > other.lineno
-          1
+        def <=>(other)
+          case
+          when lineno < other.lineno
+            -1
+          when lineno == other.lineno
+            column <=> other.column
+          when lineno > other.lineno
+            1
+          end
         end
       end
-    end
 
-    def beg_pos
-      CodePosition.new(first_lineno, first_column)
-    end
+      def beg_pos
+        CodePosition.new(first_lineno, first_column)
+      end
 
-    def end_pos
-      CodePosition.new(last_lineno, last_column)
-    end
+      def end_pos
+        CodePosition.new(last_lineno, last_column)
+      end
 
-    alias to_s inspect
+      alias to_s inspect
+    end
   end
 end
 
@@ -62,7 +63,7 @@ class TestAst < Test::Unit::TestCase
 
     def ast
       return @ast if defined?(@ast)
-      ast = AST.parse_file(@path)
+      ast = RubyVM::AST.parse_file(@path)
       raise "Syntax error: #{@path}" if ast.nil?
       @ast = ast
     end
@@ -132,7 +133,7 @@ class TestAst < Test::Unit::TestCase
 
   def test_column_with_long_heredoc_identifier
     term = "A"*257
-    ast = AST.parse("<<-#{term}\n""ddddddd\n#{term}\n")
+    ast = RubyVM::AST.parse("<<-#{term}\n""ddddddd\n#{term}\n")
     node = ast.children[1]
     assert_equal("NODE_STR", node.type)
     assert_equal(0, node.first_column)