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▲ Open In App Convert C/C++ code to assembly language Last Updated : 01 Aug, 2024 Summarize Comments Improve Suggest changes Like Article Like Save Share Report Follow

The C/C++ compiler turn the given C/C++ source code into the Assembly Code. Then it is converted to the object code. We can use this property to convert the C or C++ code to assembly code.

We use gcc compiler to turn provided C/C++ code into assembly language. To see the assembly code generated by the C/C++ compiler, we can use the “-S” option on the command line:

Syntax for C

gcc -S filename.c

Syntax for C++

g++ -S filename.cpp

This will cause gcc to run the compiler, generating an assembly file.

Example

Suppose we write a C code and store it in a file name “source.c” or “source.cpp”.

source.cpp // C++ code stored in source2.cpp file #include<iostream> // Driver Code intmain() { // Declaring variables inta=2000,b=17; // Printing statement cout<<a<<" + "<<b<<": "<<a+b; return0; } source.c // C code stored in geeks.c file #include<stdio.h> // global string chars[]="GeeksforGeeks"; // Driver Code intmain() { // Declaring variables inta=2000,b=17; // Printing statement printf("%s %d \n",s,a+b); } source-file-only

Directory Before Executing the Command

Running the command: gcc -S geeks.c

cmd-screen

This will cause gcc to run the compiler, generating an assembly file source.s, and go no further. (Normally it would then invoke the assembler to generate an object- code file.)

source-and-assembly-code-generated

Assembly code Fine Genereated

The assembly-code file contains various declarations including the set of lines: 

Assembly .file "source.c" .text .def printf; .scl 3; .type 32; .endef .seh_proc printf printf: pushq %rbp .seh_pushreg %rbp pushq %rbx .seh_pushreg %rbx subq $56, %rsp .seh_stackalloc 56 leaq 48(%rsp), %rbp .seh_setframe %rbp, 48 .seh_endprologue movq %rcx, 32(%rbp) movq %rdx, 40(%rbp) movq %r8, 48(%rbp) movq %r9, 56(%rbp) leaq 40(%rbp), %rax movq %rax, -16(%rbp) movq -16(%rbp), %rbx movl $1, %ecx movq __imp___acrt_iob_func(%rip), %rax call *%rax movq %rbx, %r8 movq 32(%rbp), %rdx movq %rax, %rcx call __mingw_vfprintf movl %eax, -4(%rbp) movl -4(%rbp), %eax addq $56, %rsp popq %rbx popq %rbp ret .seh_endproc .globl s .data .align 8 s: .ascii "GeeksforGeeks\0" .def __main; .scl 2; .type 32; .endef .section .rdata,"dr" .LC0: .ascii "%s %d \12\0" .text .globl main .def main; .scl 2; .type 32; .endef .seh_proc main main: pushq %rbp .seh_pushreg %rbp movq %rsp, %rbp .seh_setframe %rbp, 0 subq $48, %rsp .seh_stackalloc 48 .seh_endprologue call __main movl $2000, -4(%rbp) movl $17, -8(%rbp) movl -4(%rbp), %edx movl -8(%rbp), %eax addl %edx, %eax movl %eax, %r8d leaq s(%rip), %rdx leaq .LC0(%rip), %rcx call printf movl $0, %eax addq $48, %rsp popq %rbp ret .seh_endproc .ident "GCC: (tdm64-1) 10.3.0" .def __mingw_vfprintf; .scl 2; .type 32; .endef

Each indented line in the above code corresponds to a single machine instruction.For example, the pushq instruction indicates that the contents of register %rbp should be pushed onto the program stack. All information about local variable names or data types has been stripped away. We still see a reference to the global variable s[]= “GeeksforGeeks”, since the compiler has not yet determined where in memory this variable will be stored.

Same thing we can do with C++. We just have to use the g++ compiler.

Comment More info Next Article 8085 code to convert binary number to ASCII code

S

Sahil Rajput Improve

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Article Tags :
  • C Language
  • C++
  • system-programming
Practice Tags :
  • CPP
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