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authorBjörn Gustavsson <[email protected]>2014-02-05 17:28:02 +0100
committerBjörn Gustavsson <[email protected]>2014-02-05 17:45:56 +0100
commit5f4b495e68de1d1762cad0a96d01b5195d3b458e (patch)
tree958127b54e582dc330ef1dde1ed0d859e734fc35 /lib/compiler
parentdf4932103f0e7b848e094ed56b1fc042f896cf8f (diff)
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beam_bsm: Eliminate emulator crash when a binary is called
We must not do the delayed binary creation optimization if the code attempts to call the matched out binary. Calling a matchstate will crash the run-time system. Reported-by: Loïc Hoguin
Diffstat (limited to 'lib/compiler')
-rw-r--r--lib/compiler/src/beam_bsm.erl1
-rw-r--r--lib/compiler/test/bs_match_SUITE.erl15
2 files changed, 14 insertions, 2 deletions
diff --git a/lib/compiler/src/beam_bsm.erl b/lib/compiler/src/beam_bsm.erl
index fdfcb08125..d54c2a9fde 100644
--- a/lib/compiler/src/beam_bsm.erl
+++ b/lib/compiler/src/beam_bsm.erl
@@ -209,6 +209,7 @@ btb_reaches_match_2([{call,Arity,{f,Lbl}}|Is], Regs, D) ->
btb_reaches_match_2([{apply,Arity}|Is], Regs, D) ->
btb_call(Arity+2, apply, Regs, Is, D);
btb_reaches_match_2([{call_fun,Live}=I|Is], Regs, D) ->
+ btb_ensure_not_used([{x,Live}], I, Regs),
btb_call(Live, I, Regs, Is, D);
btb_reaches_match_2([{make_fun2,_,_,_,Live}|Is], Regs, D) ->
btb_call(Live, make_fun2, Regs, Is, D);
diff --git a/lib/compiler/test/bs_match_SUITE.erl b/lib/compiler/test/bs_match_SUITE.erl
index 9f15845d33..149b9bbb8f 100644
--- a/lib/compiler/test/bs_match_SUITE.erl
+++ b/lib/compiler/test/bs_match_SUITE.erl
@@ -34,7 +34,7 @@
otp_7188/1,otp_7233/1,otp_7240/1,otp_7498/1,
match_string/1,zero_width/1,bad_size/1,haystack/1,
cover_beam_bool/1,matched_out_size/1,follow_fail_branch/1,
- no_partition/1]).
+ no_partition/1,calling_a_binary/1]).
-export([coverage_id/1,coverage_external_ignore/2]).
@@ -59,7 +59,7 @@ groups() ->
matching_and_andalso,otp_7188,otp_7233,otp_7240,
otp_7498,match_string,zero_width,bad_size,haystack,
cover_beam_bool,matched_out_size,follow_fail_branch,
- no_partition]}].
+ no_partition,calling_a_binary]}].
init_per_suite(Config) ->
@@ -1178,6 +1178,17 @@ no_partition_2([], a5) ->
no_partition_2(42.0, a6) ->
six.
+calling_a_binary(Config) when is_list(Config) ->
+ [] = call_binary(<<>>, []),
+ {'EXIT',{badarg,_}} = (catch call_binary(<<1>>, [])),
+ {'EXIT',{badarg,_}} = (catch call_binary(<<1,2,3>>, [])),
+ ok.
+
+call_binary(<<>>, Acc) ->
+ Acc;
+call_binary(<<H,T/bits>>, Acc) ->
+ T(<<Acc/binary,H>>).
+
check(F, R) ->
R = F().