On Friday, 21 October 2016 at 08:58:50 UTC, DLearner wrote:
Code ran with expected output, but Disassembly seemed to go in
a loop?
What makes you think that? It's hard to tell if you don't give
any information.
Let's do that! I'll use only naive flags and all and use radare2
to
disassemble the main D function which is _Dmain (the entry point
has to
launch the runtime etc... we aren't very interested in that):
$ cat >test.d <<EOF
import std.stdio;
void main() {
writeln("Hello World!");
}
EOF
$ dmd test.d
$ ./test
Hello World!
$ r2 -q -c "afr; pdf @ sym._Dmain" test
┌ (fcn) sym._Dmain 24
│ sym._Dmain ();
│ ; CALL XREF from 0x08078258 (sym.main)
│ ; DATA XREF from 0x0807825b (sym.main)
│ 0x08077e70 55 push ebp
│ 0x08077e71 8bec mov ebp, esp
│ 0x08077e73 b9d02b0a08 mov ecx,
str.Hello_World_;
"Hello World!" @ 0x80a2bd0
│ 0x08077e78 b80c000000 mov eax, 0xc
│ 0x08077e7d 51 push ecx
│ 0x08077e7e 50 push eax
│ 0x08077e7f e804000000 call
sym._D3std5stdio16__T7writelnTAyaZ7writelnFNfAyaZv
│ 0x08077e84 31c0 xor eax, eax
│ 0x08077e86 5d pop ebp
└ 0x08077e87 c3 ret
No loop. Not even a jump. I'm in x86 so arguments are simply
pushed on the
stack. No brainer.
