Sunday, May 30, 2010

Shrink PDF linux (command line)

gs -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 -dPDFSETTINGS=/screen -dNOPAUSE -dQUIET -sPAPERSIZE=a4 -dBATCH -sOutputFile=output.pdf input.pdf

Thursday, May 20, 2010

Just for fun


.file "tiny.cpp"
.local _ZStL8__ioinit
.comm _ZStL8__ioinit,1,1
.section .rodata
.LC0:
.string "Hello World"
.text
.globl main
.type main, @function
main:
.LFB957:
.cfi_startproc
.cfi_personality 0x0,__gxx_personality_v0
pushl %ebp
.cfi_def_cfa_offset 8
movl %esp, %ebp
.cfi_offset 5, -8
.cfi_def_cfa_register 5
andl $-16, %esp
subl $16, %esp
movl $.LC0, 4(%esp)
movl $_ZSt4cout, (%esp)
call _ZStlsISt11char_traitsIcEERSt13basic_ostreamIcT_ES5_PKc
movl $_ZSt4endlIcSt11char_traitsIcEERSt13basic_ostreamIT_T0_ES6_, 4(%esp)
movl %eax, (%esp)
call _ZNSolsEPFRSoS_E
movl $0, %eax
leave
ret
.cfi_endproc
.LFE957:
.size main, .-main
.type _Z41__static_initialization_and_destruction_0ii, @function
_Z41__static_initialization_and_destruction_0ii:
.LFB966:
.cfi_startproc
.cfi_personality 0x0,__gxx_personality_v0
pushl %ebp
.cfi_def_cfa_offset 8
movl %esp, %ebp
.cfi_offset 5, -8
.cfi_def_cfa_register 5
subl $24, %esp
cmpl $1, 8(%ebp)
jne .L5
cmpl $65535, 12(%ebp)
jne .L5
movl $_ZStL8__ioinit, (%esp)
call _ZNSt8ios_base4InitC1Ev
movl $_ZNSt8ios_base4InitD1Ev, %eax
movl $__dso_handle, 8(%esp)
movl $_ZStL8__ioinit, 4(%esp)
movl %eax, (%esp)
call __cxa_atexit
.L5:
leave
ret
.cfi_endproc
.LFE966:
.size _Z41__static_initialization_and_destruction_0ii, .-_Z41__static_initialization_and_destruction_0ii
.type _GLOBAL__I_main, @function
_GLOBAL__I_main:
.LFB967:
.cfi_startproc
.cfi_personality 0x0,__gxx_personality_v0
pushl %ebp
.cfi_def_cfa_offset 8
movl %esp, %ebp
.cfi_offset 5, -8
.cfi_def_cfa_register 5
subl $24, %esp
movl $65535, 4(%esp)
movl $1, (%esp)
call _Z41__static_initialization_and_destruction_0ii
leave
ret
.cfi_endproc
.LFE967:
.size _GLOBAL__I_main, .-_GLOBAL__I_main
.section .ctors,"aw",@progbits
.align 4
.long _GLOBAL__I_main
.weakref _ZL20__gthrw_pthread_oncePiPFvvE,pthread_once
.weakref _ZL27__gthrw_pthread_getspecificj,pthread_getspecific
.weakref _ZL27__gthrw_pthread_setspecificjPKv,pthread_setspecific
.weakref _ZL22__gthrw_pthread_createPmPK14pthread_attr_tPFPvS3_ES3_,pthread_create
.weakref _ZL20__gthrw_pthread_joinmPPv,pthread_join
.weakref _ZL21__gthrw_pthread_equalmm,pthread_equal
.weakref _ZL20__gthrw_pthread_selfv,pthread_self
.weakref _ZL22__gthrw_pthread_detachm,pthread_detach
.weakref _ZL22__gthrw_pthread_cancelm,pthread_cancel
.weakref _ZL19__gthrw_sched_yieldv,sched_yield
.weakref _ZL26__gthrw_pthread_mutex_lockP15pthread_mutex_t,pthread_mutex_lock
.weakref _ZL29__gthrw_pthread_mutex_trylockP15pthread_mutex_t,pthread_mutex_trylock
.weakref _ZL31__gthrw_pthread_mutex_timedlockP15pthread_mutex_tPK8timespec,pthread_mutex_timedlock
.weakref _ZL28__gthrw_pthread_mutex_unlockP15pthread_mutex_t,pthread_mutex_unlock
.weakref _ZL26__gthrw_pthread_mutex_initP15pthread_mutex_tPK19pthread_mutexattr_t,pthread_mutex_init
.weakref _ZL29__gthrw_pthread_mutex_destroyP15pthread_mutex_t,pthread_mutex_destroy
.weakref _ZL30__gthrw_pthread_cond_broadcastP14pthread_cond_t,pthread_cond_broadcast
.weakref _ZL27__gthrw_pthread_cond_signalP14pthread_cond_t,pthread_cond_signal
.weakref _ZL25__gthrw_pthread_cond_waitP14pthread_cond_tP15pthread_mutex_t,pthread_cond_wait
.weakref _ZL30__gthrw_pthread_cond_timedwaitP14pthread_cond_tP15pthread_mutex_tPK8timespec,pthread_cond_timedwait
.weakref _ZL28__gthrw_pthread_cond_destroyP14pthread_cond_t,pthread_cond_destroy
.weakref _ZL26__gthrw_pthread_key_createPjPFvPvE,pthread_key_create
.weakref _ZL26__gthrw_pthread_key_deletej,pthread_key_delete
.weakref _ZL30__gthrw_pthread_mutexattr_initP19pthread_mutexattr_t,pthread_mutexattr_init
.weakref _ZL33__gthrw_pthread_mutexattr_settypeP19pthread_mutexattr_ti,pthread_mutexattr_settype
.weakref _ZL33__gthrw_pthread_mutexattr_destroyP19pthread_mutexattr_t,pthread_mutexattr_destroy
.ident "GCC: (Ubuntu 4.4.3-4ubuntu5) 4.4.3"
.section .note.GNU-stack,"",@progbits

Tuesday, May 04, 2010

Inversion of Control pattern

I'm not a huge fan of the so-called Inversion of Control pattern. One blogger at theburningmonk.com writes, "You have Macaroni code when your application is chopped up into many little pieces and it's difficult to see the big picture which may exist only in your (or some one else's!) head."

Another blogger says, "In software design, you can often end up with Macaroni code when you overuse/misuse/abuse abstractions, and it's one of the main dangers of using Inversion of Control."

This echoes my own thoughts on the matter. It's all well and good to work toward code reuse, and encapsulation is a worthy goal. In my mind the DRY principal is the most important thing. Many ills of poor software design can be cured simply by keeping the code compact, elegant and devoid of redundancy regardless of whether or not the code is procedural, object-oriented, or tiny atomic classes bound together by an XML configuration file.

Procedural code gets a bad rap, as if code is inferior simply because it has a well defined entry and exit point. It's beautiful thing when a debugger can be used to examine a code path from end to end. It's beautiful when you can see the whole picture with your own eyes on a single page. No diagrams needed to comprehend...no scrolling through hundreds of lines of XML to find the relationships. It's all right there in the source code where it, very often, belongs.