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1 ; class C {
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2 ; public:
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3 ; float m(int i) const { return float(i + 123); }
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4 ; };
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5 ;
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6 ; extern "C" {
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7 ; float f()
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8 ; {
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9 ; C c;
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10 ; return c.m(27);
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11 ; }
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12 ; }
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13
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14
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15
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16 ; output from godbolt compiler explorer w/ msvc 19.0
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17
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18 _this$ = -12
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19 tv68 = -8
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20 tv67 = -4
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21 _i$ = 8
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22 float C::m(int)const PROC
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23 push ebp ;
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24 mov ebp, esp ;
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25 sub esp, 12 ;
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26 mov DWORD PTR _this$[ebp], ecx ;
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27 mov eax, DWORD PTR _i$[ebp] ;
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28 add eax, 123 ; |
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29 mov DWORD PTR tv67[ebp], eax ; / in arg + 123, pushed onto stack
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30 fild DWORD PTR tv67[ebp] ; \
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31 fstp DWORD PTR tv68[ebp] ; | float cast and put return value in fp0
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32 fld DWORD PTR tv68[ebp] ; |
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33 mov esp, ebp ;
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34 pop ebp ;
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35 ret 4 ;
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36 float C::m(int)const ENDP
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37
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38 _c$ = -1
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39 _f PROC
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40 push ebp ;
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41 mov ebp, esp ;
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42 push ecx ;
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43 push 27 ; arg 1
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44 lea ecx, DWORD PTR _c$[ebp] ; arg 0 (this ptr) via ecx
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45 call float C::m(int)const ; call C::m()
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46 mov esp, ebp ;
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47 pop ebp ;
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48 ret 0 ;
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49 _f ENDP
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50
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51
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52
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53 ; output from reactos-0.3.15-x86 w/ mingw gcc 4.7.2 (uses MS thiscalls; according to
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54 ; https://www.angelcode.com/dev/callconv/callconv.html MinGW has own thiscalls,
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55 ; so maybe ROSBE's MinGW has different behaviour or the web page sources are wong)
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56
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57 00000000 <_f>:
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58 0: 55 push %ebp ;
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59 1: 89 e5 mov %esp,%ebp ;
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60 3: 83 ec 14 sub $0x14,%esp ;
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61 6: 8d 45 ff lea -0x1(%ebp),%eax ; this ptr -> eax
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62 9: c7 04 24 1b 00 00 00 movl $0x1b,(%esp) ; arg 1 via stack
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63 10: 89 c1 mov %eax,%ecx ; arg 0 (this ptr) via ecx
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64 12: e8 00 00 00 00 call 17 <_f+0x17> ; call C::m()
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65 17: 83 ec 04 sub $0x4,%esp ;
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66 1a: c9 leave ;
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67 1b: c3 ret ;
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68
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69 00000000 <__ZNK1C1mEi>:
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70 0: 55 push %ebp ;
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71 1: 89 e5 mov %esp,%ebp ;
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72 3: 83 ec 08 sub $0x8,%esp ;
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73 6: 89 4d fc mov %ecx,-0x4(%ebp) ;
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74 9: 8b 45 08 mov 0x8(%ebp),%eax ;
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75 c: 83 c0 7b add $0x7b,%eax ; | in arg + 123, pushed onto stack
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76 f: 89 45 f8 mov %eax,-0x8(%ebp) ; |
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77 12: db 45 f8 fildl -0x8(%ebp) ; float cast and put return value in fp0
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78 15: c9 leave ;
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79 16: c2 04 00 ret $0x4 ;
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80
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81
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82
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83 ; vim: ft=asm
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84
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