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use me->def instead of me for opt_table

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`vm_opt_method_table` is me=>bop table to manage the optimized
methods (by specialized instruction). However, `me` can be invalidated
to invalidate the method cache entry.
[Bug #17725]

To solve the issue, use `me-def` instead of `me` which simply copied
at invalidation timing.

A test by @jeremyevans https://github.com/ruby/ruby/pull/4376
This commit is contained in:
Koichi Sasada 2021-05-13 03:10:18 +09:00
parent 7af750af8e
commit fb4cf204a6
Notes: git 2021-07-29 00:57:08 +09:00 
Merged: https://github.com/ruby/ruby/pull/4493
2 changed files with 20 additions and 6 deletions
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15
test/ruby/test_method.rb
View file

@ -1303,6 +1303,21 @@ class TestMethod < Test::Unit::TestCase
end;
end
def test_override_optimized_method_on_class_using_prepend
assert_separately(%w(--disable-gems), <<-'end;', timeout: 30)
# Bug #17725 [ruby-core:102884]
$VERBOSE = nil
String.prepend(Module.new)
class String
def + other
'blah blah'
end
end
assert_equal('blah blah', 'a' + 'b')
end;
end
def test_eqq
assert_operator(0.method(:<), :===, 5)
assert_not_operator(0.method(:<), :===, -5)

11
vm.c
View file

@ -1798,7 +1798,7 @@ rb_iter_break_value(VALUE val)
/* optimization: redefine management */
static st_table *vm_opt_method_table = 0;
static st_table *vm_opt_method_def_table = 0;
static st_table *vm_opt_mid_table = 0;
static int
@ -1852,9 +1852,8 @@ rb_vm_check_redefinition_opt_method(const rb_method_entry_t *me, VALUE klass)
klass = RBASIC_CLASS(klass);
}
if (vm_redefinition_check_method_type(me->def)) {
if (st_lookup(vm_opt_method_table, (st_data_t)me, &bop)) {
int flag = vm_redefinition_check_flag(klass);
if (st_lookup(vm_opt_method_def_table, (st_data_t)me->def, &bop)) {
int flag = vm_redefinition_check_flag(klass);
ruby_vm_redefined_flag[bop] |= flag;
}
}
@ -1885,7 +1884,7 @@ add_opt_method(VALUE klass, ID mid, VALUE bop)
const rb_method_entry_t *me = rb_method_entry_at(klass, mid);
if (me && vm_redefinition_check_method_type(me->def)) {
st_insert(vm_opt_method_table, (st_data_t)me, (st_data_t)bop);
st_insert(vm_opt_method_def_table, (st_data_t)me->def, (st_data_t)bop);
st_insert(vm_opt_mid_table, (st_data_t)mid, (st_data_t)Qtrue);
}
else {
@ -1899,7 +1898,7 @@ vm_init_redefined_flag(void)
ID mid;
VALUE bop;
vm_opt_method_table = st_init_numtable();
vm_opt_method_def_table = st_init_numtable();
vm_opt_mid_table = st_init_numtable();
#define OP(mid_, bop_) (mid = id##mid_, bop = BOP_##bop_, ruby_vm_redefined_flag[bop] = 0)