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vm: Fix potential crash in <word> primitive if profiling is enabled

db4
Slava Pestov 2009-09-24 04:31:11 -05:00
parent 1b84f179cd
commit 576e725662
2 changed files with 12 additions and 1 deletions
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5
basis/tools/profiler/profiler-tests.factor
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@ -59,3 +59,8 @@ words ;
[ ] [ [ [ ] compile-call ] profile ] unit-test
[ [ gensym execute ] profile ] [ T{ undefined } = ] must-fail-with
: crash-bug-1 ( -- x ) "hi" "bye" <word> ;
: crash-bug-2 ( -- ) 100000 [ crash-bug-1 drop ] times ;
[ ] [ [ crash-bug-2 ] profile ] unit-test

8
vm/words.cpp
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@ -66,7 +66,13 @@ void factorvm::update_word_xt(cell w_)
if(profiling_p)
{
if(!w->profiling)
w->profiling = compile_profiling_stub(w.value());
{
/* Note: can't do w->profiling = ... since if LHS
evaluates before RHS, since in that case if RHS does a
GC, we will have an invalid pointer on the LHS */
code_block *profiling = compile_profiling_stub(w.value());
w->profiling = profiling;
}
w->xt = w->profiling->xt();
}