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authorBjörn Gustavsson <bjorn@erlang.org>2012-01-18 09:04:05 +0100
committerBjörn Gustavsson <bjorn@erlang.org>2012-01-18 15:50:57 +0100
commit4c6e2c2d775bc785db7de174e12227e87d2bc542 (patch)
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parent11d255627033bb96e7c737d35badbacae32a8631 (diff)
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compiler: Correct live calculation when get/1 is used in try...catch
In the following code excerpt, the instruction marked below was incorrectly removed: . . . {'try',{y,2},{f,TryCaseLabel}}. {bif,get,{f,0},[{x,0}],{x,0}}. {move,{x,1},{y,0}}. {move,{x,3},{y,1}}. <======= Incorrectly removed {jump,{f,TryEndLabel}}. {label,TryEndLabel}. {try_end,{y,2}}. {deallocate,3}. return. {label,TryCaseLabel}. {try_case,{y,2}}. . . . beam_utils indicated that {y,1} was not used at TryEndLabel, which by itself is correct. But it is still not safe to remove the instruction, because {y,1} might be used at TryCaseLabel if an exception occurs. Noticed-by: Eric Merritt
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