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Fix #3104: Ensure that push/pops don't break returns
* return instructions may sometime reference values that rely on the current scope/frame. However, AddCallProtocalInstructionsPass introduces pops of those before returns. To ensure that returns are no longer broken, that pass should copy the value into a temporary variable before popping the scope/frame. * Added a new regression spec that primes the JIT by running the function in a loop 100 times. This ensures that the spec doesn't artificially pass because of relying on the startup interpreter. Verified that the spec fails without the fixes in this patch.
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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,17 @@ | ||
def foo(string) | ||
if string =~ /Prefix (\w)/ | ||
$1 | ||
end | ||
end | ||
|
||
# Make sure foo JITs | ||
(1..100).each do | ||
foo('Prefix A') | ||
end | ||
|
||
# https://github.com/jruby/jruby/issues/3104 | ||
describe 'pop scope/frames in AddCallProtocolInstructionsPass' do | ||
it 'should not break returns' do | ||
expect(foo("Prefix A")).to eq 'A' | ||
end | ||
end |