Hi,
this program SEGFAULTs
#include <algorithm>
int main() {
int numbers[] = { 1, 2, 3, 4, 5, 6, 7, 8, 9 };
const std::size_t nn = sizeof(numbers)/sizeof(int);
int sum = 0;
int f = 5;
std::for_each(&numbers[0], &numbers[nn], [&] (int n) {
sum += n * f;
});
}
Now, my assembly days are some 15 years past, but the disassembly is
0x08048424 <_ZZ4mainENK9__lambda0clEiz+0>: push %ebp
0x08048425 <_ZZ4mainENK9__lambda0clEiz+1>: mov %esp,%ebp
0x08048427 <_ZZ4mainENK9__lambda0clEiz+3>: mov 0x8(%ebp),%eax
0x0804842a <_ZZ4mainENK9__lambda0clEiz+6>: mov 0x4(%eax),%eax
0x0804842d <_ZZ4mainENK9__lambda0clEiz+9>: mov 0x8(%ebp),%edx
0x08048430 <_ZZ4mainENK9__lambda0clEiz+12>: mov 0x4(%edx),%edx
0x08048433 <_ZZ4mainENK9__lambda0clEiz+15>: mov (%edx),%ecx
0x08048435 <_ZZ4mainENK9__lambda0clEiz+17>: mov 0x8(%ebp),%edx
0x08048438 <_ZZ4mainENK9__lambda0clEiz+20>: mov (%edx),%edx
0x0804843a <_ZZ4mainENK9__lambda0clEiz+22>: mov (%edx),%edx
0x0804843c <_ZZ4mainENK9__lambda0clEiz+24>: imul 0xc(%ebp),%edx
0x08048440 <_ZZ4mainENK9__lambda0clEiz+28>: lea (%ecx,%edx,1),%edx
=> SEGFAULT 0x08048443 <_ZZ4mainENK9__lambda0clEiz+31>: mov %edx,(%eax)
0x08048445 <_ZZ4mainENK9__lambda0clEiz+33>: pop %ebp
0x08048446 <_ZZ4mainENK9__lambda0clEiz+34>: ret
I have marked the segfault spot. I also find 0x0804843a suspicious, but then I
don't even know how to print register values in gcc.
Any pointers to where I should dig? I am completely new to gcc hacking, just
dying to get lambda into gcc 4.5 :)
P.S: Shouldn't gcc show the actual lambda function code ( sum+= f*c; ) instead
of the assembly code in any case?
Thanks for your help!
--
Kind regards, Esben
