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authorBjörn Gustavsson <bjorn@erlang.org>2010-11-26 11:47:50 +0100
committerBjörn Gustavsson <bjorn@erlang.org>2010-12-02 17:12:24 +0100
commit2b03fbacf1ac0c06a84439baac90d418916a1778 (patch)
treea42ca97705f775998d0bc779db20b47b4e752816 /lib/compiler/test/compilation_SUITE.erl
parent8836ebccae92886decf5645944ae4ce8a2f99947 (diff)
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beam_utils: Fix check_liveness/3 for receive loops
Sometimes the beam_bool pass wants to know whether an y register will be killed by the code that follows and will do (effectively): beam_utils:is_killed({y,Y}, Code, L) When asked to calculate the liveness for an y register, beam_utils:is_killed/3 will loop forever if the code includes a receive loop. Since this rarely occurs, fix the problem in the simplest and most conservative way. Reported-by: Christopher Williams
Diffstat (limited to 'lib/compiler/test/compilation_SUITE.erl')
-rw-r--r--lib/compiler/test/compilation_SUITE.erl20
1 files changed, 19 insertions, 1 deletions
diff --git a/lib/compiler/test/compilation_SUITE.erl b/lib/compiler/test/compilation_SUITE.erl
index 7b6975f912..935e384d2d 100644
--- a/lib/compiler/test/compilation_SUITE.erl
+++ b/lib/compiler/test/compilation_SUITE.erl
@@ -46,7 +46,7 @@ all(suite) ->
trycatch_4, opt_crash,
otp_5404,otp_5436,otp_5481,otp_5553,otp_5632,
otp_5714,otp_5872,otp_6121,otp_6121a,otp_6121b,
- otp_7202,otp_7345,on_load,string_table,otp_8949_a
+ otp_7202,otp_7345,on_load,string_table,otp_8949_a,otp_8949_a
].
-define(comp(N),
@@ -628,5 +628,23 @@ otp_8949_a() ->
end
end.
+otp_8949_b(Config) when is_list(Config) ->
+ self() ! something,
+ ?line value = otp_8949_b([], false),
+ ?line {'EXIT',_} = (catch otp_8949_b([], true)),
+ ok.
+
+%% Would cause an endless loop in beam_utils.
+otp_8949_b(A, B) ->
+ Var = id(value),
+ if
+ A == [], B == false ->
+ ok
+ end,
+ receive
+ something ->
+ id(Var)
+ end.
+
id(I) -> I.