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author | Alan Wu <XrXr@users.noreply.github.com> | 2022-04-27 12:23:52 -0400 |
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committer | Alan Wu <XrXr@users.noreply.github.com> | 2022-04-28 11:31:22 -0400 |
commit | c416dbb3c700173d62c2d8381e3680b8aa4482ae (patch) | |
tree | 3a8a256a139cc4aeb54018a270eef2e4914131a6 | |
parent | 0626e6f959ed740508ff2ec1f2ff4b7188fa821d (diff) | |
download | ruby-c416dbb3c700173d62c2d8381e3680b8aa4482ae.tar.gz |
Add missing write barriers to Array#replace
Previously it made object references without using write barriers,
creating GC inconsistencies.
See: http://ci.rvm.jp/results/trunk-gc-asserts@phosphorus-docker/3925529
-rw-r--r-- | array.c | 6 | ||||
-rw-r--r-- | test/ruby/test_array.rb | 8 |
2 files changed, 12 insertions, 2 deletions
@@ -4680,14 +4680,16 @@ rb_ary_replace(VALUE copy, VALUE orig) * contents of orig. */ else if (ARY_EMBED_P(orig)) { long len = ARY_EMBED_LEN(orig); - VALUE *ptr = ary_heap_alloc(copy, len); - MEMCPY(ptr, ARY_EMBED_PTR(orig), VALUE, len); FL_UNSET_EMBED(copy); ARY_SET_PTR(copy, ptr); ARY_SET_LEN(copy, len); ARY_SET_CAPA(copy, len); + + // No allocation and exception expected that could leave `copy` in a + // bad state from the edits above. + ary_memcpy(copy, 0, len, RARRAY_CONST_PTR_TRANSIENT(orig)); } #endif /* Otherwise, orig is on heap and copy does not have enough space to embed diff --git a/test/ruby/test_array.rb b/test/ruby/test_array.rb index b100cf334c..e376d76a16 100644 --- a/test/ruby/test_array.rb +++ b/test/ruby/test_array.rb @@ -1439,6 +1439,14 @@ class TestArray < Test::Unit::TestCase assert_raise(FrozenError) { fa.replace(42) } end + def test_replace_wb_variable_width_alloc + small_embed = [] + 4.times { GC.start } # age small_embed + large_embed = [1, 2, 3, 4, 5, Array.new] # new young object + small_embed.replace(large_embed) # adds old to young reference + GC.verify_internal_consistency + end + def test_reverse a = @cls[*%w( dog cat bee ant )] assert_equal(@cls[*%w(ant bee cat dog)], a.reverse) |