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* target/9908: wrong code generated for virtual method call (gas bug?)
@ 2003-03-02 22:46 kfoltman
0 siblings, 0 replies; only message in thread
From: kfoltman @ 2003-03-02 22:46 UTC (permalink / raw)
To: gcc-gnats
>Number: 9908
>Category: target
>Synopsis: wrong code generated for virtual method call (gas bug?)
>Confidential: no
>Severity: critical
>Priority: medium
>Responsible: unassigned
>State: open
>Class: wrong-code
>Submitter-Id: net
>Arrival-Date: Sun Mar 02 22:46:01 UTC 2003
>Closed-Date:
>Last-Modified:
>Originator: Krzysztof Foltman
>Release: gcc-3.2.2
>Organization:
>Environment:
Debian-x86, mingw - both give same effect
>Description:
Wrong call type is generated in -masm=intel mode. I'm not sure, but it looks like the .S file contains correct call (call dword ptr label+8), but it's assembled as near jump (E8 08 00 00 00) instead of indirect jump (FF 15 08 00 00 00). Checked by compiling both AT&T and Intel versions with -S, assembling with as and unassembling with ndisasmw.
>How-To-Repeat:
========== cut =======================
struct B {
virtual int foo() { }
};
void check(void *pV)
{
((B *)pV)->foo();
}
int main(int argc, char *argv)
{
B b;
check((B *)&b);
}
========== cut =======================
# gcc-3.2 -O3 -masm=att -o inh inh.cpp -l stdc++ && ./inh
(this works)
# gcc-3.2 -O3 -masm=intel -o inh inh.cpp -l stdc++ && ./inh
(this segfaults)
100% repeatable both on mingw and debian gcc-3.2
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
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2003-03-02 22:46 target/9908: wrong code generated for virtual method call (gas bug?) kfoltman
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