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comparison doc/disas_examples/x64.sysv.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 | 75cb8f79d725 |
| children | f1810b5dbb3b |
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| 498:fd9ba3a6d348 | 499:fc614cb865c6 |
|---|---|
| 586 | 586 |
| 587 ; ... snip, removed code of ctor and copy ctor ... | 587 ; ... snip, removed code of ctor and copy ctor ... |
| 588 | 588 |
| 589 | 589 |
| 590 | 590 |
| 591 ; ---------- C++ trivial and non-trivial aggrs as return values ----------> | |
| 592 ; | |
| 593 ; struct Trivial { int a; }; | |
| 594 ; struct NonTrivial { int a; NonTrivial() : a(0) {} NonTrivial(const NonTrivial& rhs) : a(rhs.a) { } }; | |
| 595 ; | |
| 596 ; extern "C" { | |
| 597 ; struct Trivial f1() { return Trivial(); } | |
| 598 ; } | |
| 599 ; | |
| 600 ; struct NonTrivial f2() { return NonTrivial(); } | |
| 601 ; | |
| 602 ; extern "C" { | |
| 603 ; void f() | |
| 604 ; { | |
| 605 ; int a=1; | |
| 606 ; a += 123; | |
| 607 ; struct Trivial t = f1(); | |
| 608 ; a -= 123; | |
| 609 ; struct NonTrivial n = f2(); | |
| 610 ; a -= 12; | |
| 611 ; } | |
| 612 ; } | |
| 613 | |
| 614 | |
| 615 | |
| 616 ; output from freebsd-12.2-x64 w/ clang 10.0.1 | |
| 617 | |
| 618 00000000002019c0 <f1>: | |
| 619 2019c0: 55 push %rbp | |
| 620 2019c1: 48 89 e5 mov %rsp,%rbp | |
| 621 2019c4: 48 83 ec 10 sub $0x10,%rsp | |
| 622 2019c8: 31 f6 xor %esi,%esi | |
| 623 2019ca: 48 8d 45 f8 lea -0x8(%rbp),%rax | |
| 624 2019ce: 48 89 c7 mov %rax,%rdi | |
| 625 2019d1: ba 04 00 00 00 mov $0x4,%edx | |
| 626 2019d6: e8 75 01 00 00 callq 201b50 <memset@plt> | |
| 627 2019db: 8b 45 f8 mov -0x8(%rbp),%eax | |
| 628 2019de: 48 83 c4 10 add $0x10,%rsp | |
| 629 2019e2: 5d pop %rbp | |
| 630 2019e3: c3 retq | |
| 631 | |
| 632 00000000002019f0 <_Z2f2v>: | |
| 633 2019f0: 55 push %rbp | |
| 634 2019f1: 48 89 e5 mov %rsp,%rbp | |
| 635 2019f4: 48 83 ec 10 sub $0x10,%rsp | |
| 636 2019f8: 48 89 f8 mov %rdi,%rax | |
| 637 2019fb: 48 89 f9 mov %rdi,%rcx | |
| 638 2019fe: 48 89 4d f8 mov %rcx,-0x8(%rbp) | |
| 639 201a02: 48 89 45 f0 mov %rax,-0x10(%rbp) | |
| 640 201a06: e8 85 00 00 00 callq 201a90 <_ZN10NonTrivialC2Ev> | |
| 641 201a0b: 48 8b 45 f0 mov -0x10(%rbp),%rax | |
| 642 201a0f: 48 83 c4 10 add $0x10,%rsp | |
| 643 201a13: 5d pop %rbp | |
| 644 201a14: c3 retq | |
| 645 | |
| 646 0000000000201a20 <f>: | |
| 647 201a20: 55 push %rbp ; | | |
| 648 201a21: 48 89 e5 mov %rsp,%rbp ; | prolog | |
| 649 201a24: 48 83 ec 10 sub $0x10,%rsp ; | | |
| 650 201a28: c7 45 fc 01 00 00 00 movl $0x1,-0x4(%rbp) ; a = 1 | |
| 651 201a2f: 8b 45 fc mov -0x4(%rbp),%eax ; | | |
| 652 201a32: 83 c0 7b add $0x7b,%eax ; | a += 123 | |
| 653 201a35: 89 45 fc mov %eax,-0x4(%rbp) ; | | |
| 654 201a38: e8 83 ff ff ff callq 2019c0 <f1> ; call f1() | |
| 655 201a3d: 89 45 f8 mov %eax,-0x8(%rbp) ; retval via reg, as small struct | |
| 656 201a40: 8b 45 fc mov -0x4(%rbp),%eax ; | | |
| 657 201a43: 83 e8 7b sub $0x7b,%eax ; | a -= 123 | |
| 658 201a46: 89 45 fc mov %eax,-0x4(%rbp) ; | | |
| 659 201a49: 48 8d 7d f0 lea -0x10(%rbp),%rdi ; ptr to space to hold non-triv retval | |
| 660 201a4d: e8 9e ff ff ff callq 2019f0 <_Z2f2v> ; call f2() | |
| 661 201a52: 8b 45 fc mov -0x4(%rbp),%eax ; | | |
| 662 201a55: 83 e8 0c sub $0xc,%eax ; | a-= 12 | |
| 663 201a58: 89 45 fc mov %eax,-0x4(%rbp) ; / | |
| 664 201a5b: 48 83 c4 10 add $0x10,%rsp ; \ | |
| 665 201a5f: 5d pop %rbp ; | epilog | |
| 666 201a60: c3 retq ; | | |
| 667 | |
| 668 | |
| 669 | |
| 591 ; vim: ft=asm | 670 ; vim: ft=asm |
| 592 | 671 |