There seem to be a .CFI directive after every line and also there are wide varities of these ex.,`.cfi_startproc` , `.cfi_endproc` etc..  [more here][1]. 

    	.file	&quot;temp.c&quot;
    	.text
    .globl main
    	.type	main, @function
    main:
    .LFB0:
    	.cfi_startproc
    	pushq	%rbp
    	.cfi_def_cfa_offset 16
    	movq	%rsp, %rbp
    	.cfi_offset 6, -16
    	.cfi_def_cfa_register 6
    	movl	$0, %eax
    	leave
    	ret
    	.cfi_endproc
    .LFE0:
    	.size	main, .-main
    .globl func
    	.type	func, @function
    func:
    .LFB1:
    	.cfi_startproc
    	pushq	%rbp
    	.cfi_def_cfa_offset 16
    	movq	%rsp, %rbp
    	.cfi_offset 6, -16
    	.cfi_def_cfa_register 6
    	movl	%edi, -4(%rbp)
    	movl	%esi, %eax
    	movb	%al, -8(%rbp)
    	leave
    	ret
    	.cfi_endproc
    .LFE1:
    	.size	func, .-func
    	.ident	&quot;GCC: (Ubuntu 4.4.1-4ubuntu9) 4.4.1&quot;
    	.section	.note.GNU-stack,&quot;&quot;,@progbits


I didn&#39;t get the purpose of these.


  [1]: http://sourceware.org/binutils/docs-2.17/as/CFI-directives.html#CFI-directives

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What are CFI directives in Gnu Assembler (GAS) used for?