Class: Node

Inherits:
Object show all
Defined in:
ext/internal/node/node.c,
lib/internal/node/pp.rb,
lib/internal/node/to_a.rb,
lib/internal/node/obfusc.rb,
ext/internal/node/node.c,
ext/internal/vm/inline_cache/inline_cache.c

Overview

Node is a wrapper for Ruby’s Nodes, which are not objects. Nodes can be obtained from many of the other methods in the nodewrap library (see Method#body and Proc#body, for example).

Defined Under Namespace

Classes: ALIAS, ALLOCA, AND, ARGS, ARGSCAT, ARGSPUSH, ARRAY, ATTRASGN, ATTRSET, BACK_REF, BEGIN, BLOCK, BLOCK_ARG, BLOCK_PASS, BMETHOD, BREAK, CALL, CASE, CDECL, CFUNC, CLASS, COLON2, COLON3, CONST, CREF, CVAR, CVASGN, CVDECL, DASGN, DASGN_CURR, DEFINED, DEFN, DEFS, DMETHOD, DOT2, DOT3, DREGX, DREGX_ONCE, DSTR, DSYM, DVAR, DXSTR, ENSURE, EVSTR, FALSE, FBODY, FCALL, FLIP2, FLIP3, FOR, GASGN, GVAR, HASH, IASGN, IF, IFUNC, ITER, IVAR, LASGN, LIT, LVAR, MASGN, MATCH, MATCH2, MATCH3, MEMO, METHOD, MODULE, NEWLINE, NEXT, NIL, NOT, NTH_REF, OPT_N, OP_ASGN1, OP_ASGN2, OP_ASGN2_ARG, OP_ASGN_AND, OP_ASGN_OR, OR, POSTEXE, REDO, RESBODY, RESCUE, RETRY, RETURN, SCLASS, SCOPE, SELF, SPLAT, STR, SUPER, SVALUE, TO_ARY, TRUE, UNDEF, UNTIL, VALIAS, VCALL, WHEN, WHILE, XSTR, YIELD, ZARRAY, ZSUPER

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

._load(str) ⇒ Node

Load a dumped node.

Returns:



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# File 'ext/internal/node/node.c', line 899

static VALUE node_load(VALUE klass, VALUE str)
{
  VALUE arr, node_hash, node_id, id_hash;
  NODE * n;
  VALUE data;

  if(   rb_safe_level() >= 4
     || (rb_safe_level() >= 1 && OBJ_TAINTED(str)))
  {
    /* no playing with knives in the sandbox */
    rb_raise(rb_eSecurityError, "Insecure: can't load node");
  }

  arr = marshal_load(str);
  node_hash = rb_ary_pop(arr);
  node_id = rb_ary_pop(arr);
  id_hash = rb_hash_new();
  data = rb_hash_aref(node_hash, node_id);
  n = load_node_from_hash(data, node_id, node_hash, id_hash);
  /* TODO: Need a free function in this case */
  return wrap_node(n);
}

.compile_string(str) ⇒ Node

Compile a string into a node.

Returns:



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# File 'ext/internal/node/node.c', line 792

static VALUE node_compile_string(int argc, VALUE * argv, VALUE self)
{
  NODE * node;
  VALUE str = Qnil, file = Qnil, line = Qnil;

  rb_scan_args(argc, argv, "12", &str, &file, &line);

  file = NIL_P(file) ? rb_str_new2("(compiled)") : file;
  line = NIL_P(line) ? INT2NUM(1) : line;

  node = rb_compile_string(StringValuePtr(file), str, NUM2INT(line));

#ifdef RUBY_VM
  if(!node)
  {
    VALUE thread = rb_thread_current();
    rb_thread_t * th;
    GetThreadPtr(thread, th);
    rb_exc_raise(th->errinfo);
  }
#else
  if(ruby_nerrs > 0)
  {
    ruby_nerrs = 0;
    compile_error(0);
  }
#endif

  return wrap_node(node);
}

.nd_type ⇒ NodeType

Returns a NodeType structure representing the type of the node.

Returns:



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# File 'ext/internal/node/node.c', line 404

static VALUE node_s_type(VALUE self)
{
  const Node_Type_Descrip * descrip;
  descrip = node_type_descrip(
      NUM2INT(rb_iv_get(self, "__type__")));
  return rb_struct_new(
      rb_cNodeType,
      rb_str_new2(descrip->name),
      INT2NUM(descrip->nt));
}

Instance Method Details

#[](member) ⇒ Object

Return the given member of a node.

Returns:



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# File 'ext/internal/node/node.c', line 321

static VALUE node_bracket(VALUE node, VALUE member)
{
  ID id = SYMBOL_P(member)
    ? SYM2ID(member)
    : rb_intern(StringValuePtr(member));
  return rb_funcall(node, id, 0);
}

#_dump ⇒ String

Dump a node.

Returns:

  • (String) 


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# File 'ext/internal/node/node.c', line 873

static VALUE node_dump(VALUE self, VALUE limit)
{
  NODE * n;
  VALUE node_hash, arr, s;

  if(rb_safe_level() >= 4)
  {
    /* no access to potentially sensitive data from the sandbox */
    rb_raise(rb_eSecurityError, "Insecure: can't dump node");
  }

  Data_Get_Struct(self, NODE, n);
  node_hash = node_to_hash(n);
  arr = rb_ary_new();
  rb_ary_push(arr, node_id(n));
  rb_ary_push(arr, node_hash);
  s =  marshal_dump(arr, limit);
  return s;
}

#address ⇒ Numeric

Returns a node’s address.

Returns:

  • (Numeric) 


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# File 'ext/internal/node/node.c', line 215

static VALUE node_address(VALUE self)
{
  NODE * n;
  Data_Get_Struct(self, NODE, n);
  return ULONG2NUM((unsigned long)(n));
}

#bytecode_compile ⇒ VM::InstructionSequence

Compile a parsed node tree into a bytecode sequence.

Returns:

  • (VM::InstructionSequence)

Parameters:

  • name —

    the name of the new iseq (default <unknown>)

  • filename —

    the filename for the new iseq (default same as name)



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# File 'ext/internal/node/node.c', line 833

static VALUE node_bytecode_compile(int argc, VALUE * argv, VALUE self)
{
  NODE * node;
  VALUE name = Qnil;
  VALUE filename = Qnil;
  VALUE filepath = Qnil; /* TODO */

  rb_scan_args(argc, argv, "02", &name, &filename);

  if(name == Qnil)
  {
    name = rb_str_new2("<unknown>");
  }

  if(filename == Qnil)
  {
    filename = name;
  }

  node = unwrap_node(self);

  return rb_iseq_new(
      node,
      name,
      filename,
#if RUBY_VERSION_CODE >= 192
      filepath,
#endif
      Qfalse,
      ISEQ_TYPE_TOP);
}

#eval(Object) ⇒ Object

Evaluate a node with the given object as self and returns the result.

Returns:



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# File 'ext/internal/node/node.c', line 603

static VALUE node_eval(int argc, VALUE * argv, VALUE node)
{
  NODE * n = unwrap_node(node);

  VALUE self;
  VALUE cref = Qnil;
  rb_scan_args(argc, argv, "11", &self, &cref);

  if(rb_safe_level() >= 2)
  {
    /* evaluating a node can cause a crash */
    rb_raise(rb_eSecurityError, "Insecure: can't eval node");
  }

  return eval_ruby_node(n, self, cref);
}

#flags ⇒ Numeric

Returns a node’s flags.

Returns:

  • (Numeric) 


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# File 'ext/internal/node/node.c', line 228

static VALUE node_flags(VALUE self)
{
  NODE * n;
  Data_Get_Struct(self, NODE, n);
  return INT2NUM(n->flags);
}

#inspect ⇒ String

Returns a string representation of the node’s data.

Returns:

  • (String) 


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# File 'ext/internal/node/node.c', line 379

static VALUE node_inspect(VALUE node)
{
#ifdef HAVE_RB_PROTECT_INSPECT
  if(rb_inspecting_p(node))
  {
    VALUE str = rb_str_new2("#<");
    rb_str_cat2(str, rb_class2name(CLASS_OF(node)));
    rb_str_cat2(str, ":...>");
    return str;
  }
  else
  {
    return rb_protect_inspect(node_inspect_protect, node, 0);
  }
#else
  return rb_exec_recursive(node_inspect_protect, node, 0);
#endif
}

#members ⇒ Array of String

Return an array of strings containing the names of a node’s members.

Returns:

  • (Array of String) 


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# File 'ext/internal/node/node.c', line 310

static VALUE node_members(VALUE node)
{
  return node_s_members(rb_class_of(node));
}

#nd_file ⇒ String?

Returns the file the node is associated with

Returns:

  • (String, nil) 


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# File 'ext/internal/node/node.c', line 241

static VALUE node_nd_file(VALUE self)
{
#ifdef HAVE_RB_SOURCE_FILENAME
  NODE * n;
  Data_Get_Struct(self, NODE, n);
  if(n->nd_file)
  {
    return rb_str_new2(n->nd_file);
  }
  else
  {
    return Qnil;
  }
#else
  /* nd_file has been removed in 1.9 */
  return Qnil;
#endif
}

#nd_line ⇒ Numeric

Returns the line number the node is associated with.

Returns:

  • (Numeric) 


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# File 'ext/internal/node/node.c', line 266

static VALUE node_nd_line(VALUE self)
{
  NODE * n;
  Data_Get_Struct(self, NODE, n);
  return LONG2NUM(nd_line(n));
}

#nd_type ⇒ NodeType

Returns a NodeType structure representing the type of the node.

Returns:



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# File 'ext/internal/node/node.c', line 279

static VALUE node_nd_type(VALUE self)
{
  NODE * n;
  const Node_Type_Descrip * descrip;
  Data_Get_Struct(self, NODE, n);
  rb_check_type((VALUE)(self), T_DATA);
  descrip = node_type_descrip(nd_type(n));
  return rb_struct_new(
      rb_cNodeType,
      rb_str_new2(descrip->name),
      INT2NUM(descrip->nt));
}

#obfusc(begin_nodes = []) ⇒ Object 



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# File 'lib/internal/node/obfusc.rb', line 4

def obfusc(begin_nodes=[])
  n = self

  # The outputted code must do the following:
  #   1. Evaluate each of the begin nodes (BEGIN {...}).
  #   2. Evaluate the main node.
  return "require 'internal/node'\nif RUBY_VERSION != \"\#{RUBY_VERSION}\" then\n  $stderr.puts \"Wrong Ruby version; please use \#{RUBY_VERSION}\"\n  exit 1\nend\nbegin_nodes = Marshal.load(\#{Marshal.dump(begin_nodes).inspect})\nn = Marshal.load(\#{Marshal.dump(n).inspect})\nbegin_nodes.each do |node|\n  node.eval(self)\nend\nn.eval(self)\n  END\nend\n"

#pretty_print(pp) ⇒ Object

Pretty-print node using Node#tree onto s, which can be a String or IO.



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# File 'lib/internal/node/pp.rb', line 58

def pretty_print(pp)
  pp.text(tree())
end

#swap(another_node) ⇒ Node

Swap one node with another. Both nodes must respond to the #swap method. Returns the receiver.

Returns:



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# File 'ext/internal/node/node.c', line 937

static VALUE node_swap(VALUE self, VALUE other)
{
  NODE * n1;
  NODE * n2;
  NODE tmp;

  if(!rb_obj_respond_to(other, rb_intern("swap"), 0))
  {
    rb_raise(rb_eArgError, "Argument must respond to #swap");
  }

  if(   rb_safe_level() >= 4
     || (rb_safe_level() >= 1 && (OBJ_TAINTED(other) || OBJ_TAINTED(self))))
  {
    /* no playing with knives in the sandbox */
    rb_raise(rb_eSecurityError, "Insecure: can't swap node");
  }

  Data_Get_Struct(self, NODE, n1);
  Data_Get_Struct(other, NODE, n2);

  tmp = *n1;
  *n1 = *n2;
  *n2 = tmp;

  return self;
}

#to_a ⇒ Object

Raises:

  • (NotImplementedError) 


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# File 'lib/internal/node/to_a.rb', line 47

def to_a
  raise NotImplementedError, "#to_a not defined for #{self.class}"
end

#tree(s = '', prefix = '') ⇒ Object

Return a string containing an ascii-art tree of the node’s structure.



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# File 'lib/internal/node/pp.rb', line 24

def tree(s = '', prefix = '')
  s << "NODE_#{self.nd_type.to_s} at #{self.nd_file}:#{self.nd_line}\n"
  self.members.each_with_index do |member, idx|
    last = (idx == self.members.size-1)
    s << "#{prefix}#{(last ? '+-' : '|-')}#{member} = "
    value = self[member]
    if Node === value then
      value.tree(s, prefix + (last ? '  ' : '| '))
    elsif defined?(RubyVM) and
          defined?(RubyVM::InstructionSequence) and
          RubyVM::InstructionSequence === value then
      s << "<ISeq:#{value.self.name}@#{value.self.filename}>\n"
      d = value.disasm
      lines = d.split("\n")
      lines.each_with_index do |line, line_idx|
        if line =~ /^== disasm: (.*?)=/ then line = $1; end
        if line =~ /(.*)\s+\(\s*\d+\)/ then line = $1; end
        next if line =~ /^\|-----/
        last_line = (line_idx == lines.size-1)
        s << "#{prefix}#{last ? '  ' : '| '}#{(last_line ? '+-' : '|-')}#{line}\n"
      end
      # p value.local_table
    elsif member == 'noex' then
      s << Noex.stringify(value) + "\n"
    else
      s << value.inspect + "\n"
    end
  end
  return s
end