= y; z = 1; } 通过gcc查看编译成的汇编指令,这里我们采用O3优化等级: gcc -S demo.c -O3 截取一段我们重点关注的代码: fun: .LFB0: .cfi_startproc...gcc -S demo.c -O0 fun: .LFB0: .cfi_startproc endbr64 pushq %rbp .cfi_def_cfa_offset 16 .cfi_offset...volatile int x, y, z; void fun(){ x = y; z = 1; } 编译结果: fun: .LFB0: .cfi_startproc endbr64...@ ubuntu in ~/codelab/c/Nov [21:35:52] $ gcc cpuchaos.c -o chaos -lpthread # linux @ ubuntu in ~/...# linux @ ubuntu in ~/codelab/c/Nov [21:37:54] $ .
本文主要讨论x64架构下Linux系统的函数调用约定即System V AMD64调用约定。...call.c : .file "call.c" .text .globl foo .type foo, @function foo: .LFB0: .cfi_startproc...-foo .globl main .type main, @function main: .LFB1: .cfi_startproc pushq %rbp...long sum = foo(8589934593, 8589934597, 3, 4,5,6,7,8,9); return 0; } 编译为汇编后: foo: .LFB0: .cfi_startproc...-foo .globl main .type main, @function main: .LFB1: .cfi_startproc pushq %rbp
马马虎虎学完了Python课程,一直想学下linux,看到里面有个linux的就选上了。...命令编译成汇编代码 代码 .file "main.c" .text .globl g .type g, @function g: .LFB0: .cfi_startproc...-g .globl f .type f, @function f: .LFB1: .cfi_startproc pushl %ebp .cfi_def_cfa_offset...-f .globl main .type main, @function main: .LFB2: .cfi_startproc pushl %ebp...《Linux内核分析》MOOC课程http://mooc.study.163.com/course/USTC-1000029000
以上代码对应的汇编代码如下(g++ -S -m32 p39.cc): _Z6foobarv: //foobar(), c++filt _Z6foobarv .LFB1021: .cfi_startproc...cout<<bar.str<<endl; } } test函数对应的汇编代码如下: _Z4testv: .LFB1024: .cfi_startproc...ret .cfi_endproc Bar构造函数对应的汇编代码如下: _ZN3BarC2Ev: //Bar::Bar() .LFB1026: .cfi_startproc...<endl; } } 对应的汇编代码如下(g++ -S -m32 p44.cc): _ZN3BarC2Ev: //Bar::Bar() .LFB1026: .cfi_startproc....text .globl _Z4testv .type _Z4testv, @function _Z4testv: .LFB1024: .cfi_startproc
b->show(); delete b; } 1.1 test()函数对应的汇编代码如下 _Z4testv: //test .LFB1041: .cfi_startproc...addl $16, %esp .L39: //略 1.2 _ZN1CC1Ev对应的汇编代码如下: _ZN1CC1Ev: //C:C() .LFB1053: .cfi_startproc...call _ZN1XC2Ev //X:X() /* _ZN1XC2Ev对应的代码如下: _ZN1XC2Ev: //X::X() .LFB1044: .cfi_startproc...pushl %eax call _ZN1AC2Ev //A::A() /* _ZN1AC2Ev: .LFB1047: .cfi_startproc...eax //PUSH B.this call _ZN1BC2Ev //B::B() /* 分析略 _ZN1BC2Ev: .LFB1050: .cfi_startproc
预编译过程,就是在源代码中进行文本替换工作,比如c中的#include的替换,以及宏定义的替换等;最终输出的依然是 普通的文本文件;在Linux中使用gcc可以用如下命令获得预编译的结果: [root@....text .globl main .type main, @function main: .LFB0: .cfi_startproc pushq %rbp...text [root@www ~]# NOTE: 上面的步骤手动展示了编译的大概过程(预编译--->编译--->汇编),而在实际使用的时候,并不是这样一步步进行操作的(也不需要这样一步步进行操作),linux
return 0; } 该程序对应的汇编代码如下(g++ -S -m32 p13.cc): _ZN1X3fooEv: //X::foo() .LFB1021: .cfi_startproc..._ZN1XC2Ev .type _ZN1XC2Ev, @function _ZN1XC2Ev: //X::X() 默认构造函数 .LFB1024: .cfi_startproc...globl _Z6foobarv .type _Z6foobarv, @function _Z6foobarv: //foobar .LFB1022: .cfi_startproc...cfi_restore 3 .cfi_def_cfa 4, 4 ret $4 .cfi_endproc main: .LFB1029: .cfi_startproc
isLive(course); if (isLive) { // 存在,则杀死该进程 killProc(course); //启动进程 startProc...(course); } else { //启动进程 startProc(course); } } catch (Exception e) { logger.error...; } %%%%%最关键的:启动进程代码:%%%%% /** * 启动进程 * @throws IOException */ public static void startProc(String
以上代码对应的汇编如下(g++ -S -m32 p27.cc): _ZN9ZooAnimalC2ERKS_: //ZooAnimal默认copy ctor .LFB1031: .cfi_startproc...cfi_restore 5 .cfi_def_cfa 4, 4 ret .cfi_endproc main: .LFB1029: .cfi_startproc
__ioinit .comm _ZStL8__ioinit,1,1 .text .globl main .type main, @function main: .LFB1021: .cfi_startproc...static_initialization_and_destruction_0ii, @function _Z41__static_initialization_and_destruction_0ii: .LFB1027: .cfi_startproc...static_initialization_and_destruction_0ii .type _GLOBAL__sub_I_main, @function _GLOBAL__sub_I_main: .LFB1028: .cfi_startproc
.text .globl main .type main, @function main: .LFB0: .cfi_startproc pushq %rbp...gcc -o helloWorld helloWorld.c 执行上面的命令之后,就得到了我们的helloWorld程序了,在linux下,它是一种ELF格式的文件,后面的文章我们会更多地介绍到。...我们通过ldd命令看到helloWorld程序链接了系统的库: ldd helloWorld linux-vdso.so.1 => (0x00007ffe9ef11000) libc.so....6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f0d9f038000) /lib64/ld-linux-x86-64.so.2 (0x00007f0d9f402000
ZN7point3dC2Ev .type _ZN7point3dC2Ev, @function _ZN7point3dC2Ev: //即函数point3d::point3d() .LFB972: .cfi_startproc...ZlsRSoR7point3d,comdat .weak _ZlsRSoR7point3d .type _ZlsRSoR7point3d, @function main: .LFB975: .cfi_startproc...static_initialization_and_destruction_0ii, @function _Z41__static_initialization_and_destruction_0ii: .LFB983: .cfi_startproc...static_initialization_and_destruction_0ii .type _GLOBAL__sub_I_main, @function _GLOBAL__sub_I_main: .LFB984: .cfi_startproc
filename: whiles .file "while.c" .text .globl main .type main, @function main: .LFB0: .cfi_startproc...filename: for.s .file "for.c" .text .globl main .type main, @function main: .LFB0: .cfi_startproc
sum; } 以上C程序对应的汇编代码如下: .file "c0.c" .text .globl main .type main, @function main: .LFB0: .cfi_startproc...-main .globl test .type test, @function test: .LFB1: .cfi_startproc pushl %ebp //ebp压栈,即old ebp
igrep - 命令行交互式 Grep igrep 是一个交互式的 grep 工具,在后台运行 grep 库,允许用户交互式地选择匹配项,并在选择的文本编辑器(默认为 vim)中打开,支持 Linux,...或者可以唯一确定该符号的字符串): cargo asm --lib "mini_std::math::lerp" 然后就可以看到对应的汇编指令: mini_std::math::lerp: .cfi_startproc
Bell b; Widget &w =b; w.show(); } test函数对应的汇编代码如下: _Z4testv: .LFB1022: .cfi_startproc
(linux命令:gcc -Og -s hello.c) 汇编阶段:汇编器ss将汇编程序翻译成二进制的机器语言,并把结果保存在以.o结尾的二进制文件中。...(linux命令:gcc -Og -c hello.c) 链接阶段:链接器ld将程序用到的C语言类库的函数汇编后的代码合并到hello.o,得到可执行的目标文件。...(linux命令:gcc -o hello hello.c) 对二进制文件进行反编译:objdump -d hello.o 随着高级编程语言的到来,我们只需要关注语言本身,其他的交给编译器我们就可以写出不错的代码...file "process.c" .text .globl swap .type swap, @function swap: .LFB23: .cfi_startproc....string "%d" .text .globl main .type main, @function main: .LFB24: .cfi_startproc
return 0; } 汇编结果: .file "mm.cpp" .text .globl main .type main, @function main: .LFB0: .cfi_startproc
section .rodata .LC0: .string "%d %d %d\n" .text .globl main .type main, @function main: .LFB0: .cfi_startproc...free(p); } 对应的汇编代码为 .file "c2-1.c" .text .globl main .type main, @function main: .LFB2: .cfi_startproc
main.c" 5 .text 6 .globl main 7 .type main, @function 8 main: 9 .LFB0: 10 .cfi_startproc
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