Mercurial > pub > dyncall > dyncall
comparison doc/disas_examples/x86.cdecl.disas @ 499:fc614cb865c6
- doc and disasexample additions specific to non-trivial C++ aggregates as return values (incl. fixes to doc and additional LSB specific PPC32 section)
| author | Tassilo Philipp |
|---|---|
| date | Mon, 04 Apr 2022 15:50:52 +0200 |
| parents | cb19b2fe2422 |
| children | 585dcb68f55d |
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| 498:fd9ba3a6d348 | 499:fc614cb865c6 |
|---|---|
| 713 | 713 |
| 714 ; ... snip, removed code of ctor and copy ctor ... | 714 ; ... snip, removed code of ctor and copy ctor ... |
| 715 | 715 |
| 716 | 716 |
| 717 | 717 |
| 718 ; ---------- C++ trivial and non-trivial aggrs as return values ----------> | |
| 719 ; | |
| 720 ; struct Trivial { int a; }; | |
| 721 ; struct NonTrivial { int a; NonTrivial() : a(0) {} NonTrivial(const NonTrivial& rhs) : a(rhs.a) { } }; | |
| 722 ; | |
| 723 ; extern "C" { | |
| 724 ; struct Trivial f1() { return Trivial(); } | |
| 725 ; } | |
| 726 ; | |
| 727 ; struct NonTrivial f2() { return NonTrivial(); } | |
| 728 ; | |
| 729 ; extern "C" { | |
| 730 ; void f() | |
| 731 ; { | |
| 732 ; int a=1; | |
| 733 ; a += 123; | |
| 734 ; struct Trivial t = f1(); | |
| 735 ; a -= 123; | |
| 736 ; struct NonTrivial n = f2(); | |
| 737 ; a -= 12; | |
| 738 ; } | |
| 739 ; } | |
| 740 | |
| 741 | |
| 742 | |
| 743 ; output from openbsd-4.0-x86 w/ gcc 3.3.5 (propolice) | |
| 744 | |
| 745 1c000920 <f1>: | |
| 746 1c000920: 55 push %ebp | |
| 747 1c000921: 89 e5 mov %esp,%ebp | |
| 748 1c000923: 83 ec 04 sub $0x4,%esp | |
| 749 1c000926: c7 45 fc 00 00 00 00 movl $0x0,0xfffffffc(%ebp) | |
| 750 1c00092d: 8b 45 fc mov 0xfffffffc(%ebp),%eax | |
| 751 1c000930: c9 leave | |
| 752 1c000931: c3 ret | |
| 753 | |
| 754 1c000932 <_Z2f2v>: | |
| 755 1c000932: 55 push %ebp | |
| 756 1c000933: 89 e5 mov %esp,%ebp | |
| 757 1c000935: 53 push %ebx | |
| 758 1c000936: 83 ec 04 sub $0x4,%esp | |
| 759 1c000939: 8b 5d 08 mov 0x8(%ebp),%ebx | |
| 760 1c00093c: 83 ec 0c sub $0xc,%esp | |
| 761 1c00093f: 53 push %ebx | |
| 762 1c000940: e8 87 00 00 00 call 1c0009cc <_ZN10NonTrivialC1Ev> | |
| 763 1c000945: 83 c4 10 add $0x10,%esp | |
| 764 1c000948: 89 d8 mov %ebx,%eax | |
| 765 1c00094a: 8b 5d fc mov 0xfffffffc(%ebp),%ebx | |
| 766 1c00094d: c9 leave | |
| 767 1c00094e: c2 04 00 ret $0x4 | |
| 768 1c000951: 90 nop | |
| 769 | |
| 770 1c000952 <f>: | |
| 771 1c000952: 55 push %ebp ; | |
| 772 1c000953: 89 e5 mov %esp,%ebp ; | |
| 773 1c000955: 83 ec 28 sub $0x28,%esp ; | |
| 774 1c000958: c7 45 f4 01 00 00 00 movl $0x1,0xfffffff4(%ebp) ; a = 1 | |
| 775 1c00095f: 8d 45 f4 lea 0xfffffff4(%ebp),%eax ; | | |
| 776 1c000962: 83 00 7b addl $0x7b,(%eax) ; | a += 12 | |
| 777 1c000965: e8 b6 ff ff ff call 1c000920 <f1> ; call f1() | |
| 778 1c00096a: 89 45 f0 mov %eax,0xfffffff0(%ebp) ; | |
| 779 1c00096d: 8d 45 f4 lea 0xfffffff4(%ebp),%eax ; | | |
| 780 1c000970: 83 28 7b subl $0x7b,(%eax) ; | a -= 123 | |
| 781 1c000973: 8d 45 d8 lea 0xffffffd8(%ebp),%eax ; space (at top of stack) to hold non-triv retval -> eax | |
| 782 1c000976: 83 ec 0c sub $0xc,%esp ; grow stack by 12 | |
| 783 1c000979: 50 push %eax ; hidden first arg: ptr to space for retval | |
| 784 1c00097a: e8 b3 ff ff ff call 1c000932 <_Z2f2v> ; call f2() | |
| 785 1c00097f: 83 c4 0c add $0xc,%esp ; shrink stack back by 12 | |
| 786 1c000982: 8d 45 f4 lea 0xfffffff4(%ebp),%eax ; | | |
| 787 1c000985: 83 28 0c subl $0xc,(%eax) ; | a -= 12 | |
| 788 1c000988: c9 leave ; | |
| 789 1c000989: c3 ret ; | |
| 790 | |
| 791 | |
| 792 | |
| 718 ; vim: ft=asm | 793 ; vim: ft=asm |
| 719 | 794 |