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comparison doc/disas_examples/x86.cdecl.disas @ 614:b74d7a249642
disas example for explicit cdecl declared thiscall
| author | Tassilo Philipp |
|---|---|
| date | Sat, 01 Oct 2022 16:04:40 +0200 |
| parents | 585dcb68f55d |
| children |
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| 613:3c3e321875f7 | 614:b74d7a249642 |
|---|---|
| 788 1c000988: c9 leave ; | 788 1c000988: c9 leave ; |
| 789 1c000989: c3 ret ; | 789 1c000989: c3 ret ; |
| 790 | 790 |
| 791 | 791 |
| 792 | 792 |
| 793 ; ---------- cdecl-declared (explicit) C++ thiscall w/ msvc ----------> | |
| 794 ; | |
| 795 ; class C { | |
| 796 ; public: | |
| 797 ; float __cdecl m(int i) const { return float(i + 123); } | |
| 798 ; }; | |
| 799 ; | |
| 800 ; extern "C" { | |
| 801 ; float f() | |
| 802 ; { | |
| 803 ; C c; | |
| 804 ; return c.m(27); | |
| 805 ; } | |
| 806 ; } | |
| 807 | |
| 808 | |
| 809 | |
| 810 ; output from godbolt compiler explorer w/ msvc 19.0 | |
| 811 | |
| 812 tv68 = -8 | |
| 813 tv67 = -4 | |
| 814 _i$ = 12 | |
| 815 float C::m(int)const PROC | |
| 816 push ebp ; | |
| 817 mov ebp, esp ; | |
| 818 sub esp, 8 ; | |
| 819 mov eax, DWORD PTR _i$[ebp] ; | |
| 820 add eax, 123 ; | | |
| 821 mov DWORD PTR tv67[ebp], eax ; / in arg + 123, pushed onto stack | |
| 822 fild DWORD PTR tv67[ebp] ; \ | |
| 823 fstp DWORD PTR tv68[ebp] ; | float cast and put return value in fp0 | |
| 824 fld DWORD PTR tv68[ebp] ; | | |
| 825 mov esp, ebp ; | |
| 826 pop ebp ; | |
| 827 ret 0 ; | |
| 828 float C::m(int)const ENDP | |
| 829 | |
| 830 _c$ = -1 | |
| 831 _f PROC ; | |
| 832 push ebp ; | |
| 833 mov ebp, esp ; | |
| 834 push ecx ; | |
| 835 push 27 ; arg 1 | |
| 836 lea eax, DWORD PTR _c$[ebp] ; | | |
| 837 push eax ; | arg 0 (this ptr) | |
| 838 call float C::m(int)const ; call C::m() | |
| 839 add esp, 8 ; | |
| 840 mov esp, ebp ; | |
| 841 pop ebp ; | |
| 842 ret 0 ; | |
| 843 _f ENDP | |
| 844 | |
| 845 | |
| 846 | |
| 793 ; vim: ft=asm | 847 ; vim: ft=asm |
| 794 | 848 |