C++之生成详细汇编代码(二百一十六)

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1.前言

本篇目的：理解C++之生成详细汇编程序。

2.应用实例

<1>.代码示例

#include 

int main(void){
  int i;
  int a = 10;

  i  = a + 10;

  printf("i = %d\n",i);

  return 0;
}

编译： g++ -S -fverbose-asm test.cpp

<2>.生成详细的汇编代码

cat test.s

	.file	"test.cpp"
# GNU C++17 (Ubuntu 11.2.0-19ubuntu1) version 11.2.0 (x86_64-linux-gnu)
#	compiled by GNU C version 11.2.0, GMP version 6.2.1, MPFR version 4.1.0, MPC version 1.2.1, isl version isl-0.24-GMP

# GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
# options passed: -mtune=generic -march=x86-64 -fasynchronous-unwind-tables -fstack-protector-strong -fstack-clash-protection -fcf-protection
	.text
	.section	.rodata
.LC0:
	.string	"i = %d\n"
	.text
	.globl	main
	.type	main, @function
main:
.LFB0:
	.cfi_startproc
	endbr64	
	pushq	%rbp	#
	.cfi_def_cfa_offset 16
	.cfi_offset 6, -16
	movq	%rsp, %rbp	#,
	.cfi_def_cfa_register 6
	subq	$16, %rsp	#,
# test.cpp:5:   int a = 10;
	movl	$10, -8(%rbp)	#, a
# test.cpp:7:   i  = a + 10;
	movl	-8(%rbp), %eax	# a, tmp87
	addl	$10, %eax	#, tmp86
	movl	%eax, -4(%rbp)	# tmp86, i
# test.cpp:9:   printf("i = %d\n",i);
	movl	-4(%rbp), %eax	# i, tmp88
	movl	%eax, %esi	# tmp88,
	leaq	.LC0(%rip), %rax	#, tmp89
	movq	%rax, %rdi	# tmp89,
	movl	$0, %eax	#,
	call	printf@PLT	#
# test.cpp:11:   return 0;
	movl	$0, %eax	#, _5
# test.cpp:12: }
	leave	
	.cfi_def_cfa 7, 8
	ret	
	.cfi_endproc
.LFE0:
	.size	main, .-main
	.ident	"GCC: (Ubuntu 11.2.0-19ubuntu1) 11.2.0"
	.section	.note.GNU-stack,"",@progbits
	.section	.note.gnu.property,"a"
	.align 8
	.long	1f - 0f
	.long	4f - 1f
	.long	5
0:
	.string	"GNU"
1:
	.align 8
	.long	0xc0000002
	.long	3f - 2f
2:
	.long	0x3
3:
	.align 8
4: