c++ to asm

最新推荐文章于 2024-06-11 23:50:40 发布

elfylin

最新推荐文章于 2024-06-11 23:50:40 发布

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分类专栏： C、C++ 文章标签： c++ c file

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本文探讨了将C++代码转换为汇编语言的过程，特别是关于内联函数的使用。

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cpp

int main(int argc, char** argv)
{
	return 0;
}

asm

dump:     file format elf32-littlearm


Disassembly of section .plt:

00008378 <.plt>:
    8378:	e52de004 	push	{lr}		; (str lr, [sp, #-4]!)
    837c:	e59fe004 	ldr	lr, [pc, #4]	; 8388 <_start-0x18>
    8380:	e08fe00e 	add	lr, pc, lr
    8384:	e5bef008 	ldr	pc, [lr, #8]!
    8388:	00000d40 	andeq	r0, r0, r0, asr #26
    838c:	e28fc600 	add	ip, pc, #0	; 0x0
    8390:	e28cca00 	add	ip, ip, #0	; 0x0
    8394:	e5bcfd40 	ldr	pc, [ip, #3392]!

Disassembly of section .text:

000083a0 <_start>:
    83a0:	e1a0000d 	mov	r0, sp
    83a4:	e3a01000 	mov	r1, #0	; 0x0
    83a8:	e28f2004 	add	r2, pc, #4	; 0x4
    83ac:	e28f3004 	add	r3, pc, #4	; 0x4
    83b0:	eafffff5 	b	838c <_start-0x14>
    83b4:	ea000006 	b	83d4 <main+0x4>
    83b8:	00009000 	.word	0x00009000
    83bc:	00009008 	.word	0x00009008
    83c0:	00009010 	.word	0x00009010
    83c4:	00009018 	.word	0x00009018
    83c8:	e1a00000 	.word	0xe1a00000
    83cc:	e1a00000 	.word	0xe1a00000

000083d0 <main>:
    83d0:	2000      	movs	r0, #0
    83d2:	4770      	bx	lr
    83d4:	f004 e51f 	blx	40ce14 <_stack+0x38ce14>
    83d8:	83d1      	strh	r1, [r2, #30]

c++

int add2(int i, int j)
{
    return i+j;
}
int add(int i, int j)
{
    return add2(i,j);
}
int main(int argc, char** argv)
{
	int m = add(1,2);
    return m;
}

asm

000083d0 <add2(int, int)>:
    83d0:	1808      	adds	r0, r1, r0
    83d2:	4770      	bx	lr

000083d4 <add(int, int)>:
    83d4:	b510      	push	{r4, lr}
    83d6:	f7ff fffb 	bl	83d0 <add2(int, int)>
    83da:	bd10      	pop	{r4, pc}

000083dc <main>:
    83dc:	b510      	push	{r4, lr}
    83de:	2001      	movs	r0, #1
    83e0:	2102      	movs	r1, #2
    83e2:	f7ff fff7 	bl	83d4 <add(int, int)>
    83e6:	bd10      	pop	{r4, pc}
    83e8:	f004 e51f 	blx	40ce28 <_stack+0x38ce28>
    83ec:	83dd      	strh	r5, [r3, #30]
	...

c++

int add2(int i, int j)
{
    return i+j;
}
int add1(int i, int j)
{
    return add2(i,j);
}
int add0()
{
    return add1(2,3);
}
int main(int argc, char** argv)
{
	int m = add0();
    return m;
}

asm

000083d0 <add2(int, int)>:
    83d0:	1808      	adds	r0, r1, r0
    83d2:	4770      	bx	lr

000083d4 <add1(int, int)>:
    83d4:	b510      	push	{r4, lr}
    83d6:	f7ff fffb 	bl	83d0 <add2(int, int)>
    83da:	bd10      	pop	{r4, pc}

000083dc <add0()>:
    83dc:	b510      	push	{r4, lr}
    83de:	2002      	movs	r0, #2
    83e0:	2103      	movs	r1, #3
    83e2:	f7ff fff7 	bl	83d4 <add1(int, int)>
    83e6:	bd10      	pop	{r4, pc}

000083e8 <main>:
    83e8:	b510      	push	{r4, lr}
    83ea:	f7ff fff7 	bl	83dc <add0()>
    83ee:	bd10      	pop	{r4, pc}
    83f0:	f004 e51f 	blx	40ce30 <_stack+0x38ce30>
    83f4:	83e9      	strh	r1, [r5, #30]
	...

c++

class Rect
{
public:
Rect();
int getWidth();
int getHeight();
void setWidth(int width);
void setHeight(int height);
private:
	int m_width;
	int m_height;
};
Rect::Rect()
{
	m_width=1;
	m_height=2;
}
Rect *g_Rect = new Rect();
int Rect::getWidth()
{
	return m_width;
}
int Rect::getHeight()
{
	return m_height;
}
void Rect::setHeight(int height)
{
	 m_height = height;
}
void Rect::setWidth(int width)
{
	 m_width = width;
}
void change(Rect *p)
{
	p->setHeight(g_Rect->getWidth());
}
int main(int argc, char** argv)
{
	Rect* myrect = new Rect();
	change(myrect);
	//int o = m;
	return 0;
}

asm

00008430 <Rect::Rect()>:
    8430:	2101      	movs	r1, #1
    8432:	6001      	str	r1, [r0, #0]
    8434:	184b      	adds	r3, r1, r1
    8436:	6043      	str	r3, [r0, #4]
    8438:	4770      	bx	lr
    843a:	bf00      	nop

0000843c <Rect::getWidth()>:
    843c:	6800      	ldr	r0, [r0, #0]
    843e:	4770      	bx	lr

00008440 <Rect::setHeight(int)>:
    8440:	6041      	str	r1, [r0, #4]
    8442:	4770      	bx	lr

00008444 <change(Rect*)>:
    8444:	4b06      	ldr	r3, [pc, #24]	(8460 <change(Rect*)+0x1c>)
    8446:	b510      	push	{r4, lr}
    8448:	447b      	add	r3, pc
    844a:	681b      	ldr	r3, [r3, #0]
    844c:	4604      	mov	r4, r0
    844e:	6818      	ldr	r0, [r3, #0]
    8450:	f7ff fff4 	bl	843c <Rect::getWidth()>
    8454:	4601      	mov	r1, r0
    8456:	4620      	mov	r0, r4
    8458:	f7ff fff2 	bl	8440 <Rect::setHeight(int)>
    845c:	bd10      	pop	{r4, pc}
    845e:	bf00      	nop
    8460:	00000c80 	.word	0x00000c80

00008464 <global constructors keyed to dumpclient.cpp>:
    8464:	b510      	push	{r4, lr}
    8466:	2008      	movs	r0, #8
    8468:	f7ff efc4 	blx	83f4 <_start-0xc>
    846c:	4604      	mov	r4, r0
    846e:	f7ff ffdf 	bl	8430 <Rect::Rect()>
    8472:	4b02      	ldr	r3, [pc, #8]	(847c <global constructors keyed to dumpclient.cpp+0x18>)
    8474:	447b      	add	r3, pc
    8476:	681b      	ldr	r3, [r3, #0]
    8478:	601c      	str	r4, [r3, #0]
    847a:	bd10      	pop	{r4, pc}
    847c:	00000c54 	.word	0x00000c54

00008480 <main>:
    8480:	b510      	push	{r4, lr}
    8482:	2008      	movs	r0, #8
    8484:	f7ff efb6 	blx	83f4 <_start-0xc>
    8488:	4604      	mov	r4, r0
    848a:	f7ff ffd1 	bl	8430 <Rect::Rect()>
    848e:	4620      	mov	r0, r4
    8490:	f7ff ffd8 	bl	8444 <change(Rect*)>
    8494:	2000      	movs	r0, #0
    8496:	bd10      	pop	{r4, pc}
    8498:	f004 e51f 	blx	40ced8 <_stack+0x38ced8>
    849c:	8481      	strh	r1, [r0, #36]
	...

class CPoint
{
public:    
    CPoint(){width = 0; height =0;};
    int getWidth();
    int getHeight();    
    void testOne(int i, int );
private:
        int width;
        int height;
};
int CPoint::getWidth()
{
    return width;
}
int CPoint::getHeight()
{
    return height;
}
void CPoint::testOne(int i, int j)
{
    i = getWidth();
    j = getHeight();
}
int main()
{
    CPoint *p = new CPoint();
    p->testOne(2,3);
    return 0;
}

asm

00008758 <CPoint::testOne(int, int)>:
    8758:	b510      	push	{r4, lr}
    875a:	4604      	mov	r4, r0
    875c:	f7ff fff8 	bl	8750 <CPoint::getWidth()>
    8760:	4620      	mov	r0, r4
    8762:	f7ff fff7 	bl	8754 <CPoint::getHeight()>
    8766:	2300      	movs	r3, #0
    8768:	2202      	movs	r2, #2
    876a:	601a      	str	r2, [r3, #0]
    876c:	bd10      	pop	{r4, pc}
    876e:	bf00      	nop

07-19 23:35:58.160: INFO/DEBUG(2244): r0 00000000 r1 00000002 r2 00000002 r3 00000000
07-19 23:35:58.170: INFO/DEBUG(2244): r4 0012e008 r5 00000000 r6 00000001 r7 bec5fb6c
07-19 23:35:58.170: INFO/DEBUG(2244): r8 00000000 r9 00000000 10 00000000 fp 00000000
07-19 23:35:58.170: INFO/DEBUG(2244): ip bec5f570 sp bec5fb30 lr 00008767 pc 0000876a cpsr 20000030

for inline function

#include <stdio.h>
class CPoint  
{  
public:      
    CPoint(){width = 0; height =0;};  
    int getWidth(){int *p = NULL; return width+*p; }
    int getHeight();      
    void testOne(int i, int );  
private:  
        int width;  
        int height;  
};  
/*int CPoint::getWidth()  
{  
    int *p = 0;     
    return width+*p;  
} */ 
int CPoint::getHeight()  
{  
    return height;  
}  
void CPoint::testOne(int i, int j)  
{  
    i = getWidth();  
    j = getHeight();  
    printf("%d,%d\n",i,j);
}  
int main()  
{  
    CPoint *p = new CPoint();  
    p->testOne(2,3);  
    return 0;  
}

asm

00008464 <CPoint::testOne(int, int)>:
    8464:	2100      	movs	r1, #0
    8466:	b510      	push	{r4, lr}
    8468:	680c      	ldr	r4, [r1, #0]
    846a:	6803      	ldr	r3, [r0, #0]
    846c:	18e4      	adds	r4, r4, r3
    846e:	f7ff fff7 	bl	8460 <CPoint::getHeight()>
    8472:	4621      	mov	r1, r4
    8474:	4602      	mov	r2, r0
    8476:	4802      	ldr	r0, [pc, #8]	(8480 <CPoint::testOne(int, int)+0x1c>)
    8478:	4478      	add	r0, pc
    847a:	f7ff efcc 	blx	8414 <_start-0x1c>
    847e:	bd10      	pop	{r4, pc}
    8480:	0000002c 	.word	0x0000002c