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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 <stdio.h>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_startprocendbr64	pushq	%rbp	#.cfi_def_cfa_offset 16.cfi_offset 6, -16movq	%rsp, %rbp	#,.cfi_def_cfa_register 6subq	$16, %rsp	#,
# test.cpp:5:   int a = 10;movl	$10, -8(%rbp)	#, a
# test.cpp:7:   i  = a + 10;movl	-8(%rbp), %eax	# a, tmp87addl	$10, %eax	#, tmp86movl	%eax, -4(%rbp)	# tmp86, i
# test.cpp:9:   printf("i = %d\n",i);movl	-4(%rbp), %eax	# i, tmp88movl	%eax, %esi	# tmp88,leaq	.LC0(%rip), %rax	#, tmp89movq	%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, 8ret	.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: