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发件人： hushiwen <hushi...@ict.ac.cn>
日期： 2010年10月19日 上午1:22
主题： [Open64-user] A bug found when trying to build gcc using opencc
收件人： open64-user <open64-u...@lists.sourceforge.net>
Hi,all,
I come up with a bug,when trying to compile gcc using opencc(4.2.3,svn
trunck).
For the testcase like this:
struct foo{
int a;
int b;
};
int main()
{
struct foo *myfoo = malloc(sizeof(struct foo));
({ struct foo *const _myfoo = myfoo; _myfoo; })->b = 1;
}
The part of whirl after wgen(from .B) is:
U4STID 0 <2,2,_myfoo> T<54,anon_ptr.,4,C> {line: 10}
U4U4LDID 0 <2,2,_myfoo> T<54,anon_ptr.,4,C>
U4STID 0 <1,52,anon1> T<54,anon_ptr.,4,C> {line: 10}
I4INTCONST 1 (0x1)
U4U4LDID 0 <1,52,anon1> T<54,anon_ptr.,4,C>
I4ISTORE 4 T<54,anon_ptr.,4> <field_id:2> {line: 10}
Opencc will build a temp named anon1 to store the address of _myfoo,and put
anon1 in the global symtab.This will cause some nasty problems when the
function which has the expression like this recursively call itself.
I think anon1 is a local variable and should be put in the local symtab.
I wonder how to put anon1 in local symtab.
------------------------------
胡士文
Advanced Compiler Technology Laboratory
Key Laboratory of Computer System and Architecture
Institute of Computing Technology
Email:hushi...@ict.ac.cn <email%3ahushi...@ict.ac.cn>
2010-10-19
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