[LLVMdev] size of generated machine code ?

[Simon Burton]

On Tue, 20 Jun 2006 22:38:24 -0500 (CDT)
Chris Lattner <sabre at nondot.org> wrote:

> 
> >> Is this really the number of bytes of machine code ?
> > Yes.
> 
> To be specific, this is the number of bytes of machine code JIT'd.  Thus, 
> this only includes the stuff reachable from main, for example.  To see 
> specifically what functions it is compiling and how big they are, use:
> 
> lli -debug-only=jit foo.bc <args>

This does not seem to be available in my build (1.7 release-asserts).

Another question: does lli actually run the program ?
I've cooked up a main function that would probably segfault it.
And what i'm seeing (with strace) is that something does segfault (a child thread?) and
lli is waiting on a futex:

access("dump.bc", F_OK)                 = 0
open("dump.bc", O_RDONLY)               = 3
fstat64(3, {st_mode=S_IFREG|0600, st_size=22744, ...}) = 0
mmap2(NULL, 24576, PROT_READ, MAP_PRIVATE, 3, 0) = 0xb7fe3000
mmap2(NULL, 16777216, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb6d9c000
mmap2(0xb7d9c000, 1048576, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb6c9c000
mmap2(0xb6d9c000, 1048576, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb6b9c000
futex(0xb7fbb1b4, FUTEX_WAKE, 2147483647) = 0
brk(0)                                  = 0x8562000
brk(0x8583000)                          = 0x8583000
brk(0)                                  = 0x8583000
brk(0x85a4000)                          = 0x85a4000
brk(0)                                  = 0x85a4000
brk(0x85c5000)                          = 0x85c5000
brk(0)                                  = 0x85c5000
brk(0x85e6000)                          = 0x85e6000
brk(0)                                  = 0x85e6000
brk(0x8609000)                          = 0x8609000
brk(0)                                  = 0x8609000
brk(0x862b000)                          = 0x862b000
brk(0)                                  = 0x862b000
brk(0x864c000)                          = 0x864c000
--- SIGSEGV (Segmentation fault) @ 0 (0) ---
pipe([4, 5])                            = 0
futex(0xb7ecf900, FUTEX_WAIT, 2, NULL
 <unfinished ...>

dump.bc attached.

Simon.

-- 
Simon Burton, B.Sc.
Licensed PO Box 8066
ANU Canberra 2601
Australia
Ph. 61 02 6249 6940
http://arrowtheory.com 
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