Motivation and new data structure are described in [Bug #11203].
This patch also solve the following issues.
* [Bug #11200] Memory leak of method entries
* [Bug #11046] __callee__ returns incorrect method name in orphan
proc
* test/ruby/test_method.rb: add a test for [Bug #11046].
* vm_core.h: remvoe rb_control_frame_t::me. me is located at value
stack.
* vm_core.h, gc.c, vm_method.c: remove unlinked_method... codes
because method entries are simple VALUEs.
* method.h: Now, all method entries has own independent method
definititons. Strictly speaking, this change is not essential,
but for future changes.
* rb_method_entry_t::flag is move to rb_method_definition_t::flag.
* rb_method_definition_t::alias_count is now
rb_method_definition_t::alias_count_ptr, a pointer to the counter.
* vm_core.h, vm_insnhelper.c (rb_vm_frame_method_entry) added to
search the current method entry from value stack.
* vm_insnhelper.c (VM_CHECK_MODE): introduced to enable/disable
assertions.
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throwing data. Also define accessor functions.
* eval_intern.h: move related changes into vm_insnhelper.h.
Now these MACROs (functions) are only used in vm*.c.
There is only THROW_DATA_P(err) to check this data type or not.
* vm.c: catch up these changes.
* vm_eval.c: ditto.
* vm_insnhelper.c: ditto.
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rb_cref_t is data type of CREF. Now, the body is still NODE.
It is easy to understand what is CREF and what is pure NODE.
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* CREF_CLASS(cref)
* CREF_NEXT(cref)
* CREF_VISI(cref)
* CREF_VISI_SET(cref, v)
* CREF_REFINEMENTS(cref)
* CREF_PUSHED_BY_EVAL(cref)
* CREF_PUSHED_BY_EVAL_SET(cref)
* CREF_OMOD_SHARED(cref)
* CREF_OMOD_SHARED_SET(cref)
* CREF_OMOD_SHARED_UNSET(cref)
This is process to change CREF data type from NODE.
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struct method_table_wrapper was introduced to avoid duplicate marking
for method tables.
For example, `module M1; def foo; end; end` make one method table
(mtbl) contains a method `foo`. M1 (T_MODULE) points mtbl.
Classes C1 and C2 includes M1, then two T_ICLASS objects are created
and they points mtbl too. In this case, three objects (one T_MODULE
and two T_ICLASS objects) points same mtbl. On marking phase, these
three objects mark same mtbl. To avoid such duplication, struct
method_table_wrapper was introduced.
However, created two T_ICLASS objects have same or shorter lifetime
than M1 (T_MODULE) object. So that we only need to mark mtbl from M1,
not from T_ICLASS objects. This patch tries marking only from M1.
Note that one `Module#prepend` call creates two T_ICLASS objects.
One for refering to a prepending Module object, same as
`Module#include`. We don't nedd to care this T_ICLASS.
One for moving original mtbl from a prepending class. We need to
mark such mtbl from this T_ICLASS object. To mark the mtbl,
we need to use `RCLASS_ORIGIN(klass)` on marking from a prepended
class `klass`.
* class.c: ditto.
* eval.c (rb_using_refinement): ditto.
* gc.c: ditto.
* include/ruby/ruby.h: define m_tbl directly. The definition of
struct RClass should be moved to (srcdir)/internal.h.
* method.h: remove decl of rb_free_m_tbl_wrapper().
* object.c: use RCLASS_M_TBL() directly.
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* eval.c (setup_exception): use the given thread instead of
implicit current thread.
* load.c (rb_load_internal0): ditto.
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Unsupressable error message is not a good idea.
Note that the message is printed sometimes with following
code (highly timing dependent, though):
pid = spawn("ruby -e ''"); Process.kill(:TERM, pid)
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* eval.c (rb_frame_last_func): return the most recent frame method
name.
* thread.c (recursive_list_access): use the last method name,
instead of the current method name which can be unset in some
cases, not to use a symbol by the invalid ID.
[ruby-core:66742] [Bug #10579]
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* defs/id.def: add :mesg and :exception and move from other
sources.
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* eval.c (rb_frozen_class_p): fix message for singleton class of
class/module as same as previous versions.
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* include/ruby/ruby.h (rb_obj_freeze_inline): propagate freezing
to the singleton class if it is existing.
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make and register special exceptions.
* vm.c (rb_vm_mark): do not need to mark special exceptions
because they are registerd by rb_gc_register_mark_object().
* eval.c (Init_eval): use rb_vm_register_special_exception().
* gc.c (Init_GC): ditto.
* proc.c (Init_Proc): ditto.
* thread.c (Init_Thread): ditto.
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* eval.c (setup_exception): should not overwrite SystemStackError
backtrace if set already. [ruby-core:63377] [Feature #6216]
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* eval.c (setup_exception): get rid of method calls before raising
stack overflow, not to cause stack overflow again.
* defs/id.def: add IDs for backtraces.
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sysstack_error_p(mesg) are duplicated.
r46502 seems to want to use latter.
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* eval.c (setup_exception): set backtrace in system stack error
other than the pre-allocated sysstack_error. [Feature #6216]
* proc.c (Init_Proc): freeze the pre-allocated sysstack_error.
* vm_insnhelper.c (vm_stackoverflow): raise new instance for each
times without calling any methods to keep the backtrace with no
further stack overflow.
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* eval.c (extract_raise_opts): pass unknown options to the
exception, so that exception class can receive a hash argument.
[ruby-core:63203] [Feature #8257]
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* eval.c (setup_exception): add the method name to system stack
error message.
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constify a parameter (VALUE *).
I believe this incompatibility doesn't break any code.
However, if you have trouble, please tell us.
* eval.c, object.c: ditto.
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* eval.c (setup_exception): preserve exception class name encoding
in debug mode messages.
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* eval.c (setup_exception): remove RB_GC_GUARD which is no longer
needed since r41598.
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* eval.c (rb_mod_s_constants): return its own constants for other
than Module itself. [ruby-core:59763] [Bug #9413]
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The patch base by drkaes (Stefan Kaes).
[Bug #9321]
* variable.c (rb_mod_const_missing): use rb_vm_pop_cfunc_frame()
instead of rb_frame_pop().
* vm_eval.c (raise_method_missing): ditto.
* vm_eval.c (rb_iterate): ditto.
* internal.h (rb_vm_pop_cfunc_frame): add decl.
* test/ruby/test_settracefunc.rb: add tests.
provided by drkaes (Stefan Kaes).
* vm.c, eval.c, include/ruby/intern.h (rb_frame_pop):
move definition of rb_frame_pop() and deprecate it.
It doesn't care about `return' events.
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* eval.c (rb_longjmp): remove an extra modifier from the forward
declaration to match the actual definition. [ruby-core:59451]
[Bug #9338]
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Now, there are no setter and independent from Exception#backtrace.
[Feature #8960]
* eval.c (setup_exception): set backtrace locations for `bt_location'
special attribute.
* vm_backtrace.c (rb_backtrace_to_location_ary): added.
* internal.h: ditto.
* test/ruby/test_backtrace.rb: add a test for
Exception#backtrace_locations.
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