load.c: backtrace of circular require

	* load.c (load_lock): print backtrace of circular require via
	  `Warning.warn` [ruby-core:80850] [Bug #13505]

	Send the backtrace of the circular require warning as a single String to Warning.warn

	* load.c: send as a single string.
	* error.c: expose the string formatted by rb_warning as rb_warning_string().
	* test/ruby/test_exception.rb: update tests.
	  [ruby-core:80850] [Bug #13505]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_4@62435 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

  add TracePoint#callee_id. [ruby-core:77241] [Feature #12747]

* cont.c, eval.c, gc.c, include/ruby/intern.h, insns.def, thread.c,
  vm.c, vm_backtrace.c, vm_core.h, vm_eval.c, vm_insnhelper.c, vm_trace.c: ditto.

* test/ruby/test_settracefunc.rb: tests for above.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@56593 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

	  actually check its availability rather to check GCC's version.

	* configure.in (WARN_UNUSED_RESULT): moved to here.

	* configure.in (RUBY_FUNC_ATTRIBUTE): change function declaration
	  to return int rather than void, because it makes no sense for a
	  warn_unused_result attributed function to return void.

	  Funny thing however is that it also makes no sense for noreturn
	  attributed function to return int.  So there is a fundamental
	  conflict between them.  While I tested this, I confirmed both
	  GCC 6 and Clang 3.8 prefers int over void to correctly detect
	  necessary attributes under this setup.  Maybe subject to change
	  in future.

	* internal.h (UNINITIALIZED_VAR): renamed to MAYBE_UNUSED, then
	  moved to configure.in for the same reason we move
	  WARN_UNUSED_RESULT.

	* configure.in (MAYBE_UNUSED): moved to here.

	* internal.h (__has_attribute): deleted, because it has no use now.

	* string.c (rb_str_enumerate_lines): refactor macro rename.

	* string.c (rb_str_enumerate_bytes): ditto.

	* string.c (rb_str_enumerate_chars): ditto.

	* string.c (rb_str_enumerate_codepoints): ditto.

	* thread.c (do_select): ditto.

	* vm_backtrace.c (rb_debug_inspector_open): ditto.

	* vsnprintf.c (BSD_vfprintf): ditto.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@56169 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

  and VM_FRAME_CFRAME_P().
  Most of case, RUBY_VM_NORMAL_ISEQ_P() is no
  longer needed.

* vm_core.h: introduce rb_obj_is_iseq().

* cont.c, vm.c: VM_FRAME_MAGIC_DUMMY with
  VM_FRAME_FLAG_CFRAME.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@55804 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

* vm_eval.c (rb_eval_cmd, rb_catch_obj): use TH_JUMP_TAG with the
  same rb_thread_t used for TH_PUSH_TAG, instead of JUMP_TAG with
  the current thread global variable.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@54914 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

  T_IMEMO/imemo_iseq can be passed here.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@54543 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

* vm_backtrace.c (rb_profile_frames): ignore ifunc frames as it
  did before.  [ruby-core:72409] [Bug #11851]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@53225 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

* ruby.c (load_file_internal, ruby_process_options): share
  ruby_engine instead of literal strings.

* version.c (Init_version): remove internal `ruby_engine_name`,
  but set the VM program name in addition to the global constant.

* vm_backtrace.c (location_to_str, oldbt_init): use th eVM program
  name always.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@52782 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

  All contents of previous rb_iseq_t is in rb_iseq_t::body.
  Remove rb_iseq_t::self because rb_iseq_t is an object.
  RubyVM::InstructionSequence is wrapper object points T_IMEMO/iseq.
  So RubyVM::ISeq.of(something) method returns different wrapper
  objects but they point the same T_IMEMO/iseq object.
  This patch is big, but most of difference is replacement of
  iseq->xxx to iseq->body->xxx.
  (previous) rb_iseq_t::compile_data is also located to
  rb_iseq_t::compile_data.
  It was moved from rb_iseq_body::compile_data.
  Now rb_iseq_t has empty two pointers.
  I will split rb_iseq_body data into static data and dynamic data.
* compile.c: rename some functions/macros.
  Now, we don't need to separate iseq and iseqval (only VALUE).
* eval.c (ruby_exec_internal): `n' is rb_iseq_t (T_IMEMO/iseq).
* ext/objspace/objspace.c (count_imemo_objects): count T_IMEMO/iseq.
* gc.c: check T_IMEMO/iseq.
* internal.h: add imemo_type::imemo_iseq.
* iseq.c: define RubyVM::InstructionSequnce as T_OBJECT.
  Methods are implemented by functions named iseqw_....
* load.c (rb_load_internal0): rb_iseq_new_top() returns
  rb_iseq_t (T_IMEMO/iesq).
* method.h (rb_add_method_iseq): accept rb_iseq_t (T_IMEMO/iseq).
* vm_core.h (GetISeqPtr): removed because it is not T_DATA now.
* vm_core.h (struct rb_iseq_body): remove padding for
  [Bug #10037][ruby-core:63721].



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git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@51179 b2dd03c8-39d4-4d8f-98ff-823fe69b080e