Module: Ruby2CExtension::CommonNodeComp

Includes:
Tools::EnsureNodeTypeMixin
Included in:
Ruby2CExtension::CFunction::Base
Defined in:
lib/ruby2cext/common_node_comp.rb

Constant Summary collapse

NON_ITER_PROC = 
proc { |str, args, arg_types| str % args }

Instance Method Summary collapse

Methods included from Tools::EnsureNodeTypeMixin

#ensure_node_type

Instance Method Details

#build_args(args, one_extra = false) ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 207

def build_args(args, one_extra = false)
  if args.first == :array
    l "const int argc = #{args.last.size};"
    build_c_arr(args.last, "argv", one_extra ? 1 : 0)
  else
    l "int argc; VALUE *argv;"
    l "volatile VALUE argv_ary;" if in_while?
    assign_res(comp(args))
    l "if (TYPE(res) != T_ARRAY) res = rb_ary_to_ary(res);"
    l "argc = RARRAY(res)->len;"
    if in_while?
      # don't use ALLOCA_N in a while loop to avoid a stack overflow
      l "argv_ary = rb_ary_dup(res);"
      l "rb_ary_push(argv_ary, Qnil);" if one_extra
      l "argv = RARRAY(argv_ary)->ptr;"
    else
      l "argv = ALLOCA_N(VALUE, argc#{one_extra ? " + 1" : ""});"
      l "MEMCPY(argv, RARRAY(res)->ptr, VALUE, argc);"
    end
  end
end

#build_c_arr(arr, var_name, extra = 0) ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 201

def build_c_arr(arr, var_name, extra = 0)
  l "VALUE #{var_name}[#{arr.size + extra}];"
  arr.each_with_index { |n, i|
    l "#{var_name}[#{i}] = #{comp(n)};"
  }
end

#c_else ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 39

def c_else
  l "else {"
  yield
  l "}"
end

#c_for(exprs) ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 44

def c_for(exprs)
  l "for (#{exprs}) {"
  yield
  l "}"
end

#c_if(cond) ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 34

def c_if(cond)
  l "if (#{cond}) {"
  yield
  l "}"
end

#c_scope ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 22

def c_scope
  l "{"
  yield
  l "}"
end

#c_scope_res ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 27

def c_scope_res
  l "{"
  assign_res(yield)
  l "}"
  "res"
end

#c_static_once ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 50

def c_static_once
  c_scope_res {
    l "static VALUE static_once_value = Qundef;"
    c_if("static_once_value == Qundef") {
      assign_res(yield)
      # other thread might have been faster
      c_if("static_once_value == Qundef") {
        l "static_once_value = res;"
        l "rb_global_variable(&static_once_value);"
      }
    }
    "static_once_value"
  }
end

#comp(node) ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 146

def comp(node)
  case node
  when false
    "Qnil"
  when String
    node
  else
    while (ntype = node.first) == :newline
      node = node.last[:next]
    end
    orig_node = node
    l "/* #{ntype} */"
    begin
      if (pps = compiler.preprocessors_for(ntype))
        # apply each preprocessor until one returns a string or
        # a different node type
        pps.each { |pp_proc|
          node = pp_proc[self, node]
          break unless Array === node && node.first == ntype
        }
      end
      if Array === node && node.first == ntype
        __send__("comp_#{ntype}", node.last)
      else
        # retry with the result of preprocessing
        comp(node)
      end
    rescue Ruby2CExtError => e
      if Hash === orig_node.last && (n = orig_node.last[:node])
        # add file and line to message
        raise "#{n.file}:#{n.line}: #{e}"
      else
        raise # reraise
      end
    end
  end
end

#comp_alias(hash) ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 1255

def comp_alias(hash)
  if Array === hash[:new] # 1.8.5
    c_scope {
      l "ID new_id;"
      l "new_id = rb_to_id(#{comp(hash[:new])});"
      l "rb_alias(#{get_class}, new_id, rb_to_id(#{comp(hash[:old])}));"
    }
  else
    l "rb_alias(#{get_class}, #{sym(hash[:new])}, #{sym(hash[:old])});"
  end
  "Qnil"
end

#comp_and(hash) ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 726

def comp_and(hash)
  assign_res(comp(hash[:first]))
  c_if("RTEST(res)") {
    assign_res(comp(hash[:second]))
  }
  "res"
end

#comp_argscat(hash) ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 342

def comp_argscat(hash)
  c_scope_res {
    l "VALUE head, body;"
    l "head = #{comp(hash[:head])};"
    l "body = #{comp(hash[:body])};"
    l "body = (NIL_P(body) ? rb_ary_new3(1, Qnil) : rb_Array(body));"
    "rb_ary_concat(head, body)"
  }
end

#comp_argspush(hash) ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 351

def comp_argspush(hash)
  # argspush is used in a[2,*a]=4 for example
  c_scope_res {
    l "VALUE head;"
    l "head = rb_ary_dup(#{comp(hash[:head])});"
    "rb_ary_push(head, #{comp(hash[:body])})"
  }
end

#comp_array(arr) ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 1133

def comp_array(arr)
  c_scope_res {
    l "VALUE ary = rb_ary_new2(#{arr.size});"
    arr.each_with_index { |n, i|
      l "RARRAY(ary)->ptr[#{i}] = #{comp(n)};"
      l "RARRAY(ary)->len = #{i+1};"
    }
    "ary"
  }
end

#comp_attrasgn(hash) ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 258

def comp_attrasgn(hash)
  fun = "rb_funcall#{hash[:recv] == 0 ? 2 : 3}"
  recv = (hash[:recv] == 0 ? get_self : comp(hash[:recv]))
  c_scope_res {
    l "VALUE recv = #{recv};"
    build_args(hash[:args])
    l "#{fun}(recv, #{sym(hash[:mid])}, argc, argv);"
    "argv[argc - 1]"
  }
end

#comp_back_ref(hash) ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 1118

def comp_back_ref(hash)
  case hash[:nth]
  when ?&
    "rb_reg_last_match(rb_backref_get())"
  when ?`
    "rb_reg_match_pre(rb_backref_get())"
  when ?'
    "rb_reg_match_post(rb_backref_get())"
  when ?+
    "rb_reg_match_last(rb_backref_get())"
  else
    raise Ruby2CExtError, "unexpected back-ref type: '#{hash[:nth].chr}'"
  end
end

#comp_begin(hash) ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 360

def comp_begin(hash)
  comp(make_block(hash[:body]))
end

#comp_block(exprs) ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 184

def comp_block(exprs)
  return "Qnil" if exprs.empty?
  last = exprs.last
  exprs[0..-2].each { |ex|
    l "#{comp(ex)};"
  }
  comp(last)
end

#comp_block_pass(hash) ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 523

def comp_block_pass(hash)
  # TODO: is just a workaround/hack, does not work with instance_eval etc.
  c_scope_res {
    l "VALUE proc;"
    l "proc = #{comp(hash[:body])};"
    iter = hash[:iter]
    c_if("NIL_P(proc)") {
      assign_res(__send__("comp_#{iter.first}", iter.last))
    }
    c_else {
      # rb_obj_is_proc is static in eval.c, so we just convert and hope the best...
      add_helper "#define PROC_TSHIFT (FL_USHIFT+1)\n#define PROC_TMASK  (FL_USER1|FL_USER2|FL_USER3)\nstatic VALUE obj_to_proc(VALUE proc) {\nVALUE tmp;\ntmp = rb_check_convert_type(proc, T_DATA, \"Proc\", \"to_proc\");\nif (rb_class_real(CLASS_OF(tmp)) != rb_cProc)\nrb_raise(rb_eTypeError, \"wrong argument type %s (expected Proc)\", rb_obj_classname(proc));\nproc = tmp;\nif (ruby_safe_level >= 1 && OBJ_TAINTED(proc) &&\nruby_safe_level > ((RBASIC(proc)->flags & PROC_TMASK) >> PROC_TSHIFT))\nrb_raise(rb_eSecurityError, \"Insecure: tainted block value\");\nreturn proc;\n}\n"
      l "proc = obj_to_proc(proc);"
      add_helper "static VALUE block_pass_helper_block(VALUE bl_val, VALUE proc, VALUE self) {\nif (ruby_current_node->nd_state != 1) {\nif (bl_val == Qundef) bl_val = rb_ary_new2(0);\nelse {\nVALUE tmp = rb_check_array_type(bl_val);\nbl_val = (NIL_P(tmp) ? rb_ary_new3(1, bl_val) : tmp);\n}\n}\nif (RARRAY(bl_val)->len == 0) return rb_funcall3(proc, \#{sym(:call)}, 0, 0);\nelse {\nint argc = RARRAY(bl_val)->len;\nVALUE *argv = ALLOCA_N(VALUE, argc);\nMEMCPY(argv, RARRAY(bl_val)->ptr, VALUE, argc);\nreturn rb_funcall3(proc, \#{sym(:call)}, argc, argv);\n}\n}\n"
      assign_res(handle_iter(iter, "block_pass_helper_block", "proc"))
    }
    "res"
  }
end

#comp_break(hash) ⇒ Object

Raises:



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# File 'lib/ruby2cext/common_node_comp.rb', line 586

def comp_break(hash)
  # must be implemented by the "user" of CommonNodeComp
  raise Ruby2CExtError::NotSupported, "break is not supported"
end

#comp_call(hash, &iter_proc) ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 254

def comp_call(hash, &iter_proc)
  do_funcall(comp(hash[:recv]), hash[:mid], hash[:args], false, iter_proc)
end

#comp_case(hash) ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 450

def comp_case(hash)
  ensure_node_type(hash[:body], :when)
  c_scope_res {
    l "VALUE case_val;"
    l "case_val = #{comp(hash[:head])};"
    handle_when(hash[:body].last, proc { |val|
      # Ruby 1.8.4 actually uses rb_funcall2, but a :call node
      # (which uses rb_funcall3) is more correct
      comp([:call, {:mid => :===, :recv => val, :args => [:array, ["case_val"]]}])
    })
  }
end

#comp_cdecl(hash) ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 1043

def comp_cdecl(hash)
  c_scope_res {
    l "VALUE val;"
    l "val = #{comp(hash[:value])};"
    if Symbol === hash[:vid]
      l "rb_const_set(#{get_cbase}, #{sym(hash[:vid])}, val);"
    else
      l "rb_const_set(#{make_class_prefix(hash[:else])}, #{sym(hash[:else].last[:mid])}, val);"
    end
    "val"
  }
end

#comp_class(hash) ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 1272

def comp_class(hash)
  add_helper "static VALUE class_prep(VALUE prefix, VALUE super, ID cname) {\nVALUE klass;\nif (rb_const_defined_at(prefix, cname)) {\nklass = rb_const_get_at(prefix, cname);\nif (TYPE(klass) != T_CLASS) rb_raise(rb_eTypeError, \"%s is not a class\", rb_id2name(cname));\nif (super) {\nVALUE tmp = rb_class_real(RCLASS(klass)->super);\nif (tmp != super) rb_raise(rb_eTypeError, \"superclass mismatch for class %s\", rb_id2name(cname));\n}\nif (ruby_safe_level >= 4) rb_raise(rb_eSecurityError, \"extending class prohibited\");\n}\nelse {\nif (!super) super = rb_cObject;\nklass = rb_define_class_id(cname, super);\nrb_set_class_path(klass, prefix, rb_id2name(cname));\nrb_const_set(prefix, cname, klass);\nrb_class_inherited(super, klass);\n}\nreturn klass;\n}\n"
  sup = hash[:super]
  c_scope_res {
    l "VALUE prefix, tmp_class;"
    l "VALUE super;" if sup
    l "prefix = #{make_class_prefix(hash[:cpath])};"
    l "super = #{comp(sup)};" if sup
    l "tmp_class = class_prep(prefix, #{sup ? "super" : "0"}, #{sym(hash[:cpath].last[:mid])});"
    CFunction::ClassModuleScope.compile(self, hash[:body], "tmp_class", true)
  }
end

#comp_colon2(hash) ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 1100

def comp_colon2(hash)
  mid = hash[:mid]
  if mid.to_s[0,1].downcase != mid.to_s[0,1] # then it is a constant
    helper_class_module_check
    assign_res(comp(hash[:head]))
    l "class_module_check(res);"
    "rb_const_get_from(res, #{sym(mid)})"
  else
    "rb_funcall(#{comp(hash[:head])}, #{sym(mid)}, 0, 0)"
  end
end

#comp_colon3(hash) ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 1111

def comp_colon3(hash)
  "rb_const_get_from(rb_cObject, #{sym(hash[:mid])})"
end

#comp_const(hash) ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 1076

def comp_const(hash)
  add_helper "static VALUE const_get(ID id, NODE *cref) {\nNODE *cbase = cref;\nVALUE result;\nwhile (cbase && cbase->nd_next) {\nVALUE klass = cbase->nd_clss;\nwhile (RCLASS(klass)->iv_tbl && st_lookup(RCLASS(klass)->iv_tbl, id, &result)) {\nif (result == Qundef) {\nif (!RTEST(rb_autoload_load(klass, id))) break;\ncontinue;\n}\nreturn result;\n}\ncbase = cbase->nd_next;\n}\nreturn rb_const_get(cref->nd_clss, id);\n}\n"
  "const_get(#{sym(hash[:vid])}, #{get_cref})"
end

#comp_cvar(hash) ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 1097

def comp_cvar(hash)
  "rb_cvar_get(#{get_cvar_cbase}, #{sym(hash[:vid])})"
end

#comp_cvasgn(hash, decl = false) ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 1055

def comp_cvasgn(hash, decl = false)
  assign_res(comp(hash[:value]))
  l "rb_cvar_set(#{get_cvar_cbase}, #{sym(hash[:vid])}, res, Q#{decl});"
  "res"
end

#comp_cvdecl(hash) ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 1060

def comp_cvdecl(hash)
  comp_cvasgn(hash, true)
end

#comp_dasgn(hash) ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 996

def comp_dasgn(hash)
  "(#{scope.get_dvar(hash[:vid])} = #{comp(hash[:value])})"
end

#comp_dasgn_curr(hash) ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 999

def comp_dasgn_curr(hash)
  "(#{scope.get_dvar_curr(hash[:vid])} = #{comp(hash[:value])})"
end

#comp_defined(hash) ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 1347

def comp_defined(hash)
  head = hash[:head]
  hhash = head.last
  res =
  case head.first
  when :match2, :match3
    '"method"'
  when :yield
    '(rb_block_given_p() ? "yield" : 0)'
  when :self, :nil, :true, :false
    head.first.to_s.to_c_strlit
  when :op_asgn1, :op_asgn2, :masgn, :lasgn, :dasgn, :dasgn_curr,
    :gasgn, :iasgn, :cdecl, :cvdecl, :cvasgn  # :attrset can never be parsed
    '"assignment"'
  when :lvar
    '"local-variable"'
  when :dvar
    '"local-variable(in-block)"'
  when :gvar
    "(rb_gvar_defined(#{get_global_entry(hhash[:vid])}) ? \"global-variable\" : 0)"
  when :ivar
    "(rb_ivar_defined(#{get_self}, #{sym(hhash[:vid])}) ? \"instance-variable\" : 0)"
  when :const
    add_helper "static VALUE const_defined(ID id, NODE *cref) {\nNODE *cbase = cref;\nVALUE result;\nwhile (cbase && cbase->nd_next) {\nVALUE klass = cbase->nd_clss;\nif (RCLASS(klass)->iv_tbl && st_lookup(RCLASS(klass)->iv_tbl, id, &result)) {\nif (result == Qundef && NIL_P(rb_autoload_p(klass, id))) return Qfalse;\nreturn Qtrue;\n}\ncbase = cbase->nd_next;\n}\nreturn rb_const_defined(cref->nd_clss, id);\n}\n"
    "(const_defined(#{sym(hhash[:vid])}, #{get_cref}) ? \"constant\" : 0)"
  when :cvar
    "(rb_cvar_defined(#{get_cvar_cbase}, #{sym(hhash[:vid])}) ? \"class variable\" : 0)"
  when :colon3
    "(rb_const_defined_from(rb_cObject, #{sym(hhash[:mid])}) ? \"constant\" : 0)"
  when :nth_ref
    "(RTEST(rb_reg_nth_defined(#{hhash[:nth]}, rb_backref_get())) ? \"$#{hhash[:nth]}\" : 0)"
  when :back_ref
    "(RTEST(rb_reg_nth_defined(0, rb_backref_get())) ? \"$#{hhash[:nth].chr}\" : 0)"
  else
    raise Ruby2CExtError::NotSupported, "defined? with node type #{head.first} is not supported"
  end
  if res[0,1] == '"' # just a string
    "rb_str_new2(#{res})"
  else
    c_scope_res {
      l "char * def_desc;"
      l "def_desc = #{res};"
      "(def_desc ? rb_str_new2(def_desc) : Qnil)"
    }
  end
end

#comp_defn(hash) ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 1212

def comp_defn(hash)
  add_helper "static void class_nil_check(VALUE klass) {\nif (NIL_P(klass)) rb_raise(rb_eTypeError, \"no class/module to add method\");\n}\n"
  l "class_nil_check(#{get_class});" # can happen in instance_eval for Fixnum/Symbol
  CFunction::Method.compile(self, hash[:defn], scope.vmode_def_fun, get_class, hash[:mid])
  "Qnil"
end

#comp_defs(hash) ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 1223

def comp_defs(hash)
  add_helper "static void defs_allowed(VALUE recv, ID mid) {\nif (ruby_safe_level >= 4 && !OBJ_TAINTED(recv))\nrb_raise(rb_eSecurityError, \"Insecure: can't define singleton method\");\nif (OBJ_FROZEN(recv)) rb_error_frozen(\"object\");\nif (ruby_safe_level >= 4) {\nNODE *body = 0;\nVALUE klass = rb_singleton_class(recv);\nif (st_lookup(RCLASS(klass)->m_tbl, mid, (st_data_t *)&body))\nrb_raise(rb_eSecurityError, \"redefining method prohibited\");\n}\n}\n"
  c_scope_res {
    l "VALUE recv;"
    l "recv = #{comp(hash[:recv])};"
    l "defs_allowed(recv, #{sym(hash[:mid])});"
    CFunction::Method.compile(self, hash[:defn], "rb_define_singleton_method", "recv", hash[:mid])
    "Qnil"
  }
end

#comp_dot2(hash) ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 751

def comp_dot2(hash)
  handle_dot(hash, false)
end

#comp_dot3(hash) ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 754

def comp_dot3(hash)
  handle_dot(hash, true)
end

#comp_dregx(hash) ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 1199

def comp_dregx(hash)
  handle_dyn_str(hash)
  "rb_reg_new(RSTRING(res)->ptr, RSTRING(res)->len, #{hash[:cflag]})"
end

#comp_dregx_once(hash) ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 1203

def comp_dregx_once(hash)
  c_static_once {
    comp_dregx(hash)
  }
end

#comp_dstr(hash) ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 1188

def comp_dstr(hash)
  handle_dyn_str(hash)
end

#comp_dsym(hash) ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 1195

def comp_dsym(hash)
  handle_dyn_str(hash)
  "rb_str_intern(res)"
end

#comp_dvar(hash) ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 1067

def comp_dvar(hash)
  scope.get_dvar(hash[:vid])
end

#comp_dxstr(hash) ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 1191

def comp_dxstr(hash)
  handle_dyn_str(hash)
  "rb_funcall(#{get_self}, '`', 1, res)"
end

#comp_ensure(hash) ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 712

def comp_ensure(hash)
  cflow_hash = {}
  b = CFunction::Wrap.compile(self, "ensure_body", cflow_hash) { |cf| cf.comp(hash[:head]) }
  e = CFunction::Wrap.compile(self, "ensure_ensure") { |cf| cf.comp(hash[:ensr]) } # ensr without cflow
  ensr_code = "rb_ensure(#{b}, (VALUE)#{get_wrap_ptr}, #{e}, (VALUE)#{get_wrap_ptr})"
  if cflow_hash.empty?
    ensr_code
  else
    assign_res(ensr_code)
    CFunction::Wrap::handle_wrap_cflow(self, cflow_hash)
    "res"
  end
end

#comp_evstr(hash) ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 1172

def comp_evstr(hash)
  "rb_obj_as_string(#{comp(hash[:body])})"
end

#comp_false(hash) ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 338

def comp_false(hash); "Qfalse"; end

#comp_fcall(hash, &iter_proc) ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 250

def comp_fcall(hash, &iter_proc)
  do_funcall(get_self, hash[:mid], hash[:args], true, iter_proc)
end

#comp_flip2(hash) ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 781

def comp_flip2(hash)
  handle_flip(hash, false)
end

#comp_flip3(hash) ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 784

def comp_flip3(hash)
  handle_flip(hash, true)
end

#comp_for(hash) ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 574

def comp_for(hash)
  # transform to equivalent iter node
  hash = hash.dup
  hash[:iter] = [:call, {:args=>false, :mid=>:each, :recv=>hash[:iter]}]
  comp_iter(hash)
end

#comp_gasgn(hash) ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 1002

def comp_gasgn(hash)
  assign_res(comp(hash[:value]))
  l "rb_gvar_set(#{get_global_entry(hash[:vid])}, res);"
  "res"
end

#comp_gvar(hash) ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 1070

def comp_gvar(hash)
  "rb_gvar_get(#{get_global_entry(hash[:vid])})"
end

#comp_hash(hash) ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 1147

def comp_hash(hash)
  if (arr = hash[:head])
    ensure_node_type(arr, :array)
    arr = arr.last
    raise Ruby2CExtError, "odd number list for hash" unless arr.size % 2 == 0
    c_scope_res {
      l "VALUE key, hash = rb_hash_new();"
      arr.each_with_index { |n, i|
        if i % 2 == 0
          l "key = #{comp(n)};"
        else
          l "rb_hash_aset(hash, key, #{comp(n)});"
        end
      }
      "hash"
    }
  else
    "rb_hash_new()"
  end
end

#comp_iasgn(hash) ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 1007

def comp_iasgn(hash)
  assign_res(comp(hash[:value]))
  l "rb_ivar_set(#{get_self}, #{sym(hash[:vid])}, res);"
  "res"
end

#comp_if(hash) ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 364

def comp_if(hash)
  cond = comp(hash[:cond])
  if !hash[:body] && !hash[:else]
    l cond + ";"
    "Qnil"
  else
    c_if("RTEST(#{cond})") {
      assign_res(comp(hash[:body]))
    }
    c_else {
      assign_res(comp(hash[:else]))
    }
    "res"
  end
end

#comp_iter(hash) ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 581

def comp_iter(hash)
  bl_fun, need_clos = CFunction::Block.compile(self, make_block(hash[:body]), hash[:var])
  handle_iter(hash[:iter], bl_fun, need_clos ? get_closure_ary_var : "Qnil")
end

#comp_ivar(hash) ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 1073

def comp_ivar(hash)
  "rb_ivar_get(#{get_self}, #{sym(hash[:vid])})"
end

#comp_lasgn(hash) ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 993

def comp_lasgn(hash)
  "(#{scope.get_lvar(hash[:vid])} = #{comp(hash[:value])})"
end

#comp_lit(hash) ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 317

def comp_lit(hash)
  case (l = hash[:lit])
  when Fixnum
    "LONG2FIX(#{l.inspect})"
  when Symbol
    "ID2SYM(#{sym(l)})"
  when Bignum
    global_const("rb_cstr_to_inum(#{l.to_s.to_c_strlit}, 10, Qfalse)")
  when Float
    global_const("rb_float_new(%.40e)" % l)
  when Range
    global_const("rb_range_new(#{comp_lit(:lit=>l.first)}, #{comp_lit(:lit=>l.last)}, Q#{l.exclude_end?})")
  when Regexp
    s = l.source
    global_const("rb_reg_new(#{s.to_c_strlit}, #{s.size}, #{l.options})")
  else
    raise Ruby2CExtError::Bug, "unsupported literal type: #{l.inspect}"
  end
end

#comp_lvar(hash) ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 1064

def comp_lvar(hash)
  "#{scope.get_lvar(hash[:vid])}"
end

#comp_masgn(hash) ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 923

def comp_masgn(hash)
  c_scope_res {
    l "VALUE ma_val;"
    l "long ma_len;"
    l "ma_val = #{comp(hash[:value])};"
    l "ma_len = RARRAY(ma_val)->len;"
    head_len = 0
    if (head = hash[:head])
      ensure_node_type(head, :array)
      head_len = head.last.size
      head.last.each_with_index { |asgn, i|
        handle_assign(asgn, "(#{i} < ma_len ? RARRAY(ma_val)->ptr[#{i}] : Qnil)", false)
      }
    end
    if ((args = hash[:args]) && (args != -1))
      handle_assign(args, "(#{head_len} < ma_len ? rb_ary_new4(ma_len-#{head_len}, " +
        "RARRAY(ma_val)->ptr+#{head_len}) : rb_ary_new2(0))", false)
    end
    "ma_val"
  }
end

#comp_match(hash) ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 393

def comp_match(hash)
  "rb_reg_match2(#{comp_lit(hash)})"
end

#comp_match2(hash) ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 396

def comp_match2(hash)
  c_scope_res {
    l "VALUE recv;"
    l "recv = #{comp(hash[:recv])};"
    "rb_reg_match(recv, #{comp(hash[:value])})"
  }
end

#comp_match3(hash) ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 403

def comp_match3(hash)
  c_scope_res {
    l "VALUE recv, val;"
    l "recv = #{comp(hash[:recv])};"
    l "val = #{comp(hash[:value])};"
    "(TYPE(val) == T_STRING ? rb_reg_match(recv, val) : rb_funcall(val, #{sym(:=~)}, 1, recv))"
  }
end

#comp_module(hash) ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 1306

def comp_module(hash)
  add_helper "static VALUE module_prep(VALUE prefix, ID cname) {\nVALUE module;\nif (rb_const_defined_at(prefix, cname)) {\nmodule = rb_const_get_at(prefix, cname);\nif (TYPE(module) != T_MODULE) rb_raise(rb_eTypeError, \"%s is not a module\", rb_id2name(cname));\nif (ruby_safe_level >= 4) rb_raise(rb_eSecurityError, \"extending module prohibited\");\n}\nelse {\nmodule = rb_define_module_id(cname);\nrb_set_class_path(module, prefix, rb_id2name(cname));\nrb_const_set(prefix, cname, module);\n}\nreturn module;\n}\n"
  c_scope_res {
    l "VALUE prefix, tmp_module;"
    l "prefix = #{make_class_prefix(hash[:cpath])};"
    l "tmp_module = module_prep(prefix, #{sym(hash[:cpath].last[:mid])});"
    CFunction::ClassModuleScope.compile(self, hash[:body], "tmp_module", false)
  }
end

#comp_next(hash) ⇒ Object

Raises:



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# File 'lib/ruby2cext/common_node_comp.rb', line 590

def comp_next(hash)
  # must be implemented by the "user" of CommonNodeComp
  raise Ruby2CExtError::NotSupported, "next is not supported"
end

#comp_nil(hash) ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 337

def comp_nil(hash); "Qnil"; end

#comp_not(hash) ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 740

def comp_not(hash)
  "(RTEST(#{comp(hash[:body])}) ? Qfalse : Qtrue)"
end

#comp_nth_ref(hash) ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 1115

def comp_nth_ref(hash)
  "rb_reg_nth_match(#{hash[:nth]}, rb_backref_get())"
end

#comp_op_asgn1(hash) ⇒ Object

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# File 'lib/ruby2cext/common_node_comp.rb', line 790

def comp_op_asgn1(hash)
  ensure_node_type(hash[:args], :argscat)
  c_scope_res {
    l "VALUE oa1_recv, oa1_val;"
    l "oa1_recv = #{comp(hash[:recv])};"
    c_scope_res {
      build_args(hash[:args].last[:body], true)
      l "oa1_val = rb_funcall3(oa1_recv, #{sym(:[])}, argc, argv);"
      mid = hash[:mid]
      rval = hash[:args].last[:head]
      if Symbol === mid
        call = [:call, {:recv=>"oa1_val", :mid=>mid, :args=>[:array, [rval]]}]
        l "oa1_val = #{comp(call)};"
        l "{"
      else
        # mid == 0 is OR, mid == 1 is AND
        l "if (#{mid == 0 ? "!" : ""}RTEST(oa1_val)) {"
        l "oa1_val = #{comp(rval)};"
      end
      l "argv[argc] = oa1_val;"
      l "rb_funcall2(oa1_recv, #{sym(:[]=)}, argc + 1, argv);"
      l "}"
      "oa1_val"
    }
  }
end

#comp_op_asgn2(hash) ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 816

def comp_op_asgn2(hash)
  ensure_node_type(ids = hash[:next], :op_asgn2)
  ids = ids.last
  c_scope_res {
    l "VALUE oa2_recv, oa2_val;"
    l "oa2_recv = #{comp(hash[:recv])};"
    call = [:call, {:recv=>"oa2_recv", :mid=>ids[:vid], :args=>false}]
    l "oa2_val = #{comp(call)};"
    mid = ids[:mid]
    if Symbol === mid
      call = [:call, {:recv=>"oa2_val", :mid=>mid, :args=>[:array, [hash[:value]]]}]
      l "oa2_val = #{comp(call)};"
      l "{"
    else
      # mid == 0 is OR, mid == 1 is AND
      l "if (#{mid == 0 ? "!" : ""}RTEST(oa2_val)) {"
      l "oa2_val = #{comp(hash[:value])};"
    end
    l "rb_funcall2(oa2_recv, #{sym(ids[:aid])}, 1, &oa2_val);"
    l "}"
    "oa2_val"
  }
end

#comp_op_asgn_and(hash) ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 888

def comp_op_asgn_and(hash)
  assign_res(comp(hash[:head]))
  c_if("RTEST(res)") {
    assign_res(comp(hash[:value]))
  }
  "res"
end

#comp_op_asgn_or(hash) ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 895

def comp_op_asgn_or(hash)
  if Symbol === (aid = hash[:aid])
    def_test =
      case aid.to_s
      when /\A@@/
        "rb_cvar_defined(#{get_cvar_cbase}, #{sym(aid)})"
      when /\A@/
        "rb_ivar_defined(#{get_self}, #{sym(aid)})"
      when /\A\$/
        "rb_gvar_defined(#{get_global_entry(aid)})"
      else
        raise Ruby2CExtError::Bug, "unexpected aid for op_asgn_or: #{aid.inspect}"
      end
    c_if(def_test) {
      assign_res(comp(hash[:head]))
    }
    c_else {
      assign_res("Qnil")
    }
  else
    assign_res(comp(hash[:head]))
  end
  c_if("!RTEST(res)") {
    assign_res(comp(hash[:value]))
  }
  "res"
end

#comp_or(hash) ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 733

def comp_or(hash)
  assign_res(comp(hash[:first]))
  c_if("!RTEST(res)") {
    assign_res(comp(hash[:second]))
  }
  "res"
end

#comp_postexe(hash, &iter_proc) ⇒ Object

Raises:



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# File 'lib/ruby2cext/common_node_comp.rb', line 380

def comp_postexe(hash, &iter_proc)
  raise Ruby2CExtError, "postexe only allowed with iter" unless iter_proc
  c_scope {
    l "static int done = 0;"
    c_if("!done") {
      l "done = 1;"
      # compile as at_exit (rb_f_END() is static)
      l do_funcall(get_self, :at_exit, false, true, iter_proc)
    }
  }
  "Qnil"
end

#comp_redo(hash) ⇒ Object

Raises:



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# File 'lib/ruby2cext/common_node_comp.rb', line 594

def comp_redo(hash)
  # must be implemented by the "user" of CommonNodeComp
  raise Ruby2CExtError::NotSupported, "redo is not supported"
end

#comp_rescue(hash) ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 624

def comp_rescue(hash)
  ensure_node_type(resb = hash[:resq], :resbody)
  # compile the real body
  cflow_hash = {}
  body = CFunction::Wrap.compile(self, "rescue_body", cflow_hash) { |cf|
    cf.instance_eval {
      l "#{get_wrap_ptr}->state |= 1;"
      comp(hash[:head])
    }
  }
  # now all the resbodies in one c function
  res_bodies = CFunction::Wrap.compile(self, "rescue_resbodies", cflow_hash) { |cf|
    cf.instance_eval {
      cnt = 0
      while resb
        cnt += 1
        args = resb.last[:args]
        unless args
          l "if (rb_obj_is_kind_of(ruby_errinfo, rb_eStandardError)) {"
        else
          add_helper "static void rescue_mod_check(VALUE mod) {\nif (!rb_obj_is_kind_of(mod, rb_cModule)) {\nrb_raise(rb_eTypeError, \"class or module required for rescue clause\");\n}\n}\n"
          if args.first == :array # TODO
            # ruby doesn't handle this case specially, but it might be faster this way
            # (on the other side: we might miss exceptions (for not evaluated entries of the array))
            args.last.each { |ex|
              assign_res(comp(ex))
              l "rescue_mod_check(res);"
              l "if (!RTEST(rb_funcall(res, #{sym(:===)}, 1, ruby_errinfo))) {"
            }
            # non did match
            assign_res("Qfalse")
            # close all ifs
            args.last.size.times { l "}" }
          else
            c_scope {
              l "int i = 0;"
              # TODO: ruby has BEGIN_CALLARGS protection here, is this really necessary???
              build_args(args)
              assign_res("Qfalse")
              c_for("; i < argc; ++i") {
                l "rescue_mod_check(argv[i]);"
                c_if("RTEST(rb_funcall(argv[i], #{sym(:===)}, 1, ruby_errinfo))") {
                  assign_res("Qtrue");
                  l "break;"
                }
              }
            }
          end
          l "if (res) {"
        end
        l "#{get_wrap_ptr}->state &= ~1;" # set first bit = 0
        assign_res(comp(resb.last[:body]))
        l "}"
        l "else {"
        resb = resb.last[:head]
      end
      # we are in the last else, if the exception wasn't handled, then reraise
      l "rb_jump_tag(0x6 /* TAG_RAISE */);"
      # close all elses
      cnt.times { l "}" }
    }
    "res"
  }
  # now call rb_rescue2 with the two bodies (and handle else if necessary)
  c_scope_res {
    else_node = hash[:else]
    l "long save_state = #{get_wrap_ptr}->state;"
    l "long do_else;" if else_node
    wp = "(VALUE)#{get_wrap_ptr}"
    assign_res("rb_rescue2(#{body}, #{wp}, #{res_bodies}, #{wp}, rb_eException, (VALUE)0)")
    l "do_else = #{get_wrap_ptr}->state & 1;" if else_node
    l "#{get_wrap_ptr}->state = (#{get_wrap_ptr}->state & ~1) | (save_state & 1);" # restore the 1st bit of save_state
    CFunction::Wrap::handle_wrap_cflow(self, cflow_hash)
    if else_node
      c_if("do_else") {
        assign_res(comp(else_node))
      }
    end
    "res"
  }
end

#comp_retry(hash) ⇒ Object

Raises:



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# File 'lib/ruby2cext/common_node_comp.rb', line 602

def comp_retry(hash)
  # must be implemented by the "user" of CommonNodeComp
  raise Ruby2CExtError::NotSupported, "retry is not supported"
end

#comp_return(hash) ⇒ Object

Raises:



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# File 'lib/ruby2cext/common_node_comp.rb', line 598

def comp_return(hash)
  # must be implemented by the "user" of CommonNodeComp
  raise Ruby2CExtError::NotSupported, "return is not supported"
end

#comp_sclass(hash) ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 1331

def comp_sclass(hash)
  add_helper "static void sclass_check(VALUE obj) {\nif (FIXNUM_P(obj) || SYMBOL_P(obj)) rb_raise(rb_eTypeError, \"no virtual class for %s\", rb_obj_classname(obj));\nif (ruby_safe_level >= 4 && !OBJ_TAINTED(obj)) rb_raise(rb_eSecurityError, \"Insecure: can't extend object\");\n}\n"
  c_scope_res {
    l "VALUE tmp_sclass;"
    l "tmp_sclass = #{comp(hash[:recv])};"
    l "sclass_check(tmp_sclass);"
    l "tmp_sclass = rb_singleton_class(tmp_sclass);"
    CFunction::ClassModuleScope.compile(self, hash[:body], "tmp_sclass", true)
  }
end

#comp_self(hash) ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 340

def comp_self(hash); get_self; end

#comp_splat(hash) ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 607

def comp_splat(hash)
  assign_res(comp(hash[:head]))
  "(NIL_P(res) ? rb_ary_new3(1, Qnil) : rb_Array(res))"
end

#comp_str(hash) ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 1168

def comp_str(hash)
  lit = global_const("rb_str_new(#{hash[:lit].to_c_strlit}, #{hash[:lit].size})")
  "rb_str_new3(#{lit})"
end

#comp_super(hash, &iter_proc) ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 302

def comp_super(hash, &iter_proc)
  iter_proc ||= NON_ITER_PROC
  helper_super_allowed_check
  l "super_allowed_check();"
  args = hash[:args]
  if args
    c_scope_res {
      build_args(args)
      iter_proc["rb_call_super(%s, %s)", %w[argc argv], %w[int VALUE*]]
    }
  else
    iter_proc["rb_call_super(0, 0)", [], []]
  end
end

#comp_svalue(hash) ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 614

def comp_svalue(hash)
  assign_res(comp(hash[:head]))
  "(RARRAY(res)->len == 1 ? RARRAY(res)->ptr[0] : (RARRAY(res)->len == 0 ? Qnil : res))"
end

#comp_to_ary(hash) ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 611

def comp_to_ary(hash)
  "rb_ary_to_ary(#{comp(hash[:head])})"
end

#comp_true(hash) ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 339

def comp_true(hash); "Qtrue"; end

#comp_undef(hash) ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 1246

def comp_undef(hash)
  if Array === (mid = hash[:mid]) # 1.8.5
    l "rb_undef(#{get_class}, rb_to_id(#{comp(mid)}));"
  else
    l "rb_undef(#{get_class}, #{sym(mid)});"
  end
  "Qnil"
end

#comp_until(hash) ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 482

def comp_until(hash)
  comp_while(hash, true)
end

#comp_valias(hash) ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 1267

def comp_valias(hash)
  l "rb_alias_variable(#{sym(hash[:new])}, #{sym(hash[:old])});"
  "Qnil"
end

#comp_vcall(hash) ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 193

def comp_vcall(hash)
  if scope.vmode_method?(hash[:mid])
    "Qnil"
  else
    "rb_funcall2(#{get_self}, #{sym(hash[:mid])}, 0, 0)"
  end
end

#comp_when(hash) ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 447

def comp_when(hash)
  handle_when(hash, proc { |val| comp(val) })
end

#comp_while(hash, is_until = false) ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 463

def comp_while(hash, is_until = false)
  redo_lbl = un("while_redo")
  next_lbl = un("while_next")
  break_lbl = un("while_break")
  c_scope_res {
    l "VALUE while_res = Qnil;"
    c_for(";;") {
      l "if (#{is_until ? "" : "!"}RTEST(#{comp(hash[:cond])})) break;" if hash[:state] != 0
      l "#{redo_lbl}:"
      push_while(redo_lbl, next_lbl, break_lbl)
      l "#{comp(hash[:body])};"
      pop_while
      l "#{next_lbl}: ;"
      l "if (#{is_until ? "" : "!"}RTEST(#{comp(hash[:cond])})) break;" if hash[:state] == 0
    }
    l "#{break_lbl}:"
    "while_res"
  }
end

#comp_xstr(hash) ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 1208

def comp_xstr(hash)
  "rb_funcall(#{get_self}, '`', 1, #{comp_str(hash)})"
end

#comp_yield(hash) ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 619

def comp_yield(hash)
  val = (hash[:head] ? comp(hash[:head]) : "Qundef")
  "rb_yield#{hash[:state] == 0 ? "" : "_splat"}(#{val})"
end

#comp_zarray(hash) ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 1143

def comp_zarray(hash)
  "rb_ary_new()"
end

#comp_zsuper(hash, &iter_proc) ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 281

def comp_zsuper(hash, &iter_proc)
  if CFunction::Method === self
    # super zsuper only in a method in 1.8.5
    iter_proc ||= NON_ITER_PROC
    helper_super_allowed_check
    l "super_allowed_check();"
    # this is not 100% equivalent to 1.8.5 behavior ...
    iter_proc["rb_call_super(%s, %s)", %w[meth_argc meth_argv], %w[int VALUE*]]
  else
    raise Ruby2CExtError::NotSupported, "super without explicit arguments is not supported here"
  end
end

#do_funcall(recv, mid, args, allow_private, iter_proc) ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 231

def do_funcall(recv, mid, args, allow_private, iter_proc)
  iter_proc ||= NON_ITER_PROC
  fun = "rb_funcall#{allow_private ? 2 : 3}"
  if args
    c_scope_res {
      l "VALUE recv = #{recv};"
      build_args(args)
      iter_proc["#{fun}(%s, #{sym(mid)}, %s, %s)", %w[recv argc argv], %w[VALUE int VALUE*]]
    }
  else
    if allow_private && iter_proc == NON_ITER_PROC
      if scope.vmode_method?(mid)
        return "Qnil"
      end
    end
    iter_proc["#{fun}(%s, #{sym(mid)}, 0, 0)", [recv], %w[VALUE]]
  end
end

#get_global_entry(vid) ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 65

def get_global_entry(vid)
  g_entry = "(VALUE)rb_global_entry(#{sym(vid)})"
  "(struct global_entry*)(#{global_const(g_entry, false)})"
end

#handle_assign(asgn_node, val, undef_check = true) ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 945

def handle_assign(asgn_node, val, undef_check = true)
  c_scope {
    if undef_check
      l "VALUE as_val;"
      l "as_val = #{comp(val)};"
      l "if (as_val == Qundef) as_val = Qnil;"
      val = "as_val"
    end
    dup_node = [asgn_node.first, asgn_node.last.dup]
    case asgn_node.first
    when :lasgn, :dasgn, :dasgn_curr, :iasgn, :gasgn, :cdecl, :cvdecl, :cvasgn
      if dup_node.last[:value]
        raise Ruby2CExtError, "unexpected value in #{asgn_node.first} node in handle_assign"
      end
      dup_node.last[:value] = val
      l "#{comp(dup_node)};"
    when :masgn
      c_scope {
        l "VALUE as_ma_val;"
        l "VALUE tmp;" if (ma_head = asgn_node.last[:head])
        l "as_ma_val = #{comp(val)};"
        # adapted from svalue_to_mrhs()
        if ma_head
          l "tmp = rb_check_array_type(as_ma_val);"
          l "as_ma_val = (NIL_P(tmp) ? rb_ary_new3(1, as_ma_val) : tmp);"
        else
          l "as_ma_val = rb_ary_new3(1, as_ma_val);"
        end
        dup_node.last[:value] = "as_ma_val"
        l "#{comp(dup_node)};"
      }
    when :attrasgn # TODO: can :call also appear here ???
      c_scope {
        l "VALUE as_aa_val;"
        l "as_aa_val = #{comp(val)};"
        if asgn_node.last[:args]
          dup_node.last[:args] = [:argspush, {:body => "as_aa_val", :head => asgn_node.last[:args]}]
        else
          dup_node.last[:args] = [:array, ["as_aa_val"]]
        end
        l "#{comp(dup_node)};"
      }
    else
      raise Ruby2CExtError::Bug, "unexpected assign node type: #{asgn_node.first}"
    end
  }
end

#handle_dot(hash, dot3) ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 744

def handle_dot(hash, dot3)
  c_scope_res {
    l "VALUE beg;"
    l "beg = #{comp(hash[:beg])};"
    "rb_range_new(beg, #{comp(hash[:end])}, Q#{dot3})"
  }
end

#handle_dyn_str(hash) ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 1175

def handle_dyn_str(hash)
  ensure_node_type(hash[:next], :array)
  c_scope_res {
    l "VALUE str, str2;"
    l "str = #{comp_str(hash)};"
    hash[:next].last.each { |node|
      l "str2 = #{comp(node)};"
      l "rb_str_append(str, str2);"
      l "OBJ_INFECT(str, str2);"
    }
    "str"
  }
end

#handle_flip(hash, flip3) ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 758

def handle_flip(hash, flip3)
  flip_var = scope.get_lvar_idx(hash[:cnt] - 2)
  c_if("RTEST(#{flip_var})") {
    l "if (RTEST(#{comp(hash[:end])})) #{flip_var} = Qfalse;"
    assign_res("Qtrue")
  }
  c_else {
    if flip3
      assign_res("(RTEST(#{comp(hash[:beg])}) ? Qtrue : Qfalse)")
      l "#{flip_var} = res;"
    else
      assign_res(c_scope_res {
        l "VALUE beg_res;"
        l "beg_res = (RTEST(#{comp(hash[:beg])}) ? Qtrue : Qfalse);"
        c_if("beg_res") {
          l "#{flip_var} = (RTEST(#{comp(hash[:end])}) ? Qfalse : Qtrue);"
        }
        "beg_res"
      })
    end
  }
  "res"
end

#handle_iter(iter, bl_fun, closure) ⇒ Object

Raises:



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# File 'lib/ruby2cext/common_node_comp.rb', line 486

def handle_iter(iter, bl_fun, closure)
  ensure_node_type(iter, [:call, :fcall, :super, :zsuper, :postexe]) # attrasgn ???
  l "do {"
  block_calls = 0
  assign_res(__send__("comp_#{iter.first}", iter.last) { |str, args, arg_types|
    block_calls += 1
    c_scope_res {
      l "VALUE iter_data[#{args.size + 1}];"
      l "iter_data[0] = Qfalse;"
      args.each_with_index { |arg, i|
        l "iter_data[#{i + 1}] = (VALUE)(#{arg});"
      }
      iter_data_cast = []
      arg_types.each_with_index { |arg_type, i|
        iter_data_cast << "(#{arg_type})(iter_data[#{i + 1}])"
      }
      it_fun = compiler.add_fun("static VALUE FUNNAME(VALUE data) {\nVALUE *iter_data = (VALUE*)data;\nruby_top_self = org_ruby_top_self;\nif (iter_data[0]) return Qundef;\niter_data[0] = Qtrue;\nreturn \#{str};\n}\n".chomp % iter_data_cast, "iterate")
      # hack to make instance_eval etc. work (rb_iterate() uses ruby_top_self as block.self)
      # this _should_ be save, because rb_trap_immediate should always be 0 here ...
      l "ruby_top_self = Qundef;"
      "rb_iterate(#{it_fun}, (VALUE)iter_data, #{bl_fun}, #{closure})"
    }
  })
  raise Ruby2CExtError::Bug, "internal error while compiling iter" unless block_calls == 1
  l "}"
  l "while (res == Qundef);"
  "res"
end

#handle_method_args(arg, block_arg) ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 78

def handle_method_args(arg, block_arg)
  ensure_node_type(arg, :args)
  # handle arg
  arg = arg.last
  cnt = arg[:cnt]
  opt = make_block(arg[:opt]).last
  rest = arg[:rest] || -1
  if Array === rest # 1.8.5 change
    ensure_node_type(rest, :lasgn)
    if rest.last[:vid] == 0 # e.g. def foo(*); end
      rest = -2
    else
      rest = rest.last[:cnt]
    end
  end
  rest = rest - 2
  need_wrong_arg_num_helper = false
  if opt.empty? && rest == -3 # then it was rest == -1, which means no rest_arg
    l "if (meth_argc != #{cnt}) wrong_arg_num(meth_argc, #{cnt});"
    need_wrong_arg_num_helper = true
  else
    if cnt > 0
      l "if (meth_argc < #{cnt}) wrong_arg_num(meth_argc, #{cnt});"
      need_wrong_arg_num_helper = true
    end
    if rest == -3 # then it was rest == -1, which means no rest_arg
      l "if (meth_argc > #{cnt + opt.size}) wrong_arg_num(meth_argc, #{cnt + opt.size});"
      need_wrong_arg_num_helper = true
    end
  end
  if need_wrong_arg_num_helper
    add_helper "static void wrong_arg_num(int argc, int exp) {\nrb_raise(rb_eArgError, \"wrong number of arguments (%d for %d)\", argc, exp);\n}\n"
  end
  (0...cnt).each { |i|
    l "#{scope.get_lvar_idx(i)} = meth_argv[#{i}];"
  }
  opt.each_with_index { |asgn, i|
    c_if("meth_argc > #{cnt + i}") {
      l "#{scope.get_lvar_idx(cnt + i)} = meth_argv[#{cnt + i}];"
    }
    c_else {
      l "#{comp(asgn)};"
    }
  }
  if rest >= 0
    sum = cnt + opt.size
    c_if("meth_argc > #{sum}") {
      l "#{scope.get_lvar_idx(rest)} = rb_ary_new4(meth_argc-#{sum}, meth_argv+#{sum});"
    }
    c_else {
      l "#{scope.get_lvar_idx(rest)} = rb_ary_new2(0);"
    }
  end

  # handle block arg if available
  if block_arg
    ensure_node_type(block_arg, :block_arg)
    c_if("rb_block_given_p()") {
      l "#{scope.get_lvar(block_arg.last[:vid])} = rb_block_proc();"
    }
    # no else, lvars are initialized to nil
  end
end

#handle_when(hash, test_proc) ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 412

def handle_when(hash, test_proc)
  ensure_node_type(head = hash[:head], :array)
  c_scope_res {
    l "int when_handle = 1;"
    head.last.each { |check|
      if check.first == :when
        l "VALUE arr; long i;"
        l "arr = #{comp(check.last[:head])};"
        l "if (TYPE(arr) != T_ARRAY) arr = rb_ary_to_ary(arr);"
        c_for("i = 0; i < RARRAY(arr)->len; ++i") {
          c_if("RTEST(#{test_proc["RARRAY(arr)->ptr[i]"]})") {
            l "arr = Qfalse;"
            l "break;"
          }
        }
        l "if (RTEST(arr)) {"
      else
        l "if (!RTEST(#{test_proc[check]})) {"
      end
    }
    l "when_handle = 0;" # here all checks failed
    head.last.size.times { l "}" }
    c_if("when_handle") {
      assign_res(comp(hash[:body]))
    }
    c_else {
      if Array === hash[:next] && hash[:next].first == :when
        assign_res(handle_when(hash[:next].last, test_proc))
      else
        assign_res(comp(hash[:next]))
      end
    }
    "res"
  }
end

#helper_class_module_check ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 1013

def helper_class_module_check
  add_helper "static void class_module_check(VALUE klass) {\nswitch (TYPE(klass)) {\ncase T_CLASS:\ncase T_MODULE:\nbreak;\ndefault:\nrb_raise(rb_eTypeError, \"%s is not a class/module\", RSTRING(rb_obj_as_string(klass))->ptr);\n}\n}\n"
end

#helper_super_allowed_check ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 269

def helper_super_allowed_check
  # last_func is set to 0 by rb_require_safe
  add_helper "static void super_allowed_check() {\nif (!ruby_frame->last_func) {\nrb_raise(rb_eNoMethodError, \"super called outside of method\");\n}\n}\n"
end

#make_block(block) ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 70

def make_block(block)
  if block
    block.first == :block ? block : [:block, [block]]
  else
    [:block, []]
  end
end

#make_class_prefix(node) ⇒ Object 



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# File 'lib/ruby2cext/common_node_comp.rb', line 1027

def make_class_prefix(node)
  ensure_node_type(node, [:colon2, :colon3])
  if node.first == :colon2
    hash = node.last
    if hash[:head]
      assign_res(comp(hash[:head]))
      l "class_module_check(res);"
      "res"
    else
      get_cbase
    end
  else
    "rb_cObject"
  end
end