Mercurial > pub > dyncall > dyncall
comparison doc/disas_examples/ppc.darwin.disas @ 497:cb19b2fe2422
- more disas examples to check behaviour of passing C++ non-trivial aggregates by value; they all behave the same, calling the copy ctor first, passing a pointer then
| author | Tassilo Philipp |
|---|---|
| date | Wed, 23 Mar 2022 15:24:31 +0100 |
| parents | ead041d93e36 |
| children | fc614cb865c6 |
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| 496:da5232da6270 | 497:cb19b2fe2422 |
|---|---|
| 950 000000f0 lmw r30,0xfff8(r1) | 950 000000f0 lmw r30,0xfff8(r1) |
| 951 000000f4 blr | 951 000000f4 blr |
| 952 | 952 |
| 953 | 953 |
| 954 | 954 |
| 955 ; ---------- C++ trivial and non-trivial aggrs passed to C funcs ----------> | |
| 956 ; | |
| 957 ; struct Trivial { int a; }; | |
| 958 ; struct NonTrivial { int a; NonTrivial() : a(0) {} NonTrivial(const NonTrivial& rhs) : a(rhs.a) { } }; | |
| 959 ; | |
| 960 ; extern "C" { | |
| 961 ; | |
| 962 ; void f1(struct Trivial s) { } | |
| 963 ; void f2(struct NonTrivial s) { } | |
| 964 ; | |
| 965 ; void f() | |
| 966 ; { | |
| 967 ; struct Trivial t; | |
| 968 ; struct NonTrivial n; | |
| 969 ; int a=1; | |
| 970 ; a += 123; | |
| 971 ; f1(t); | |
| 972 ; a -= 123; | |
| 973 ; f2(n); | |
| 974 ; a -= 12; | |
| 975 ; } | |
| 976 ; } | |
| 977 | |
| 978 | |
| 979 | |
| 980 ; output from darwin-8.0.1-ppc w/ gcc 3.3 | |
| 981 | |
| 982 _f1: | |
| 983 00000000 stmw r30,0xfff8(r1) | |
| 984 00000004 stwu r1,0xffd0(r1) | |
| 985 00000008 or r30,r1,r1 | |
| 986 0000000c stw r3,0x48(r30) | |
| 987 00000010 lwz r1,_f1(r1) | |
| 988 00000014 lmw r30,0xfff8(r1) | |
| 989 00000018 blr | |
| 990 _f2: | |
| 991 0000001c stmw r30,0xfff8(r1) | |
| 992 00000020 stwu r1,0xffd0(r1) | |
| 993 00000024 or r30,r1,r1 | |
| 994 00000028 lwz r1,_f1(r1) | |
| 995 0000002c lmw r30,0xfff8(r1) | |
| 996 00000030 blr | |
| 997 _f: | |
| 998 00000034 mfspr r0,lr ; | |
| 999 00000038 stmw r30,0xfff8(r1) ; | |
| 1000 0000003c stw r0,0x8(r1) ; | |
| 1001 00000040 stwu r1,0xff70(r1) ; | |
| 1002 00000044 or r30,r1,r1 ; | |
| 1003 00000048 addi r0,r30,0x50 ; | |
| 1004 0000004c or r3,r0,r0 ; | |
| 1005 00000050 bl 0x140 ; __ZN10NonTrivialC1Ev ; NonTrivial::NonTrivial() / ctor | |
| 1006 00000054 li r0,0x1 ; | |
| 1007 00000058 stw r0,0x60(r30) ; | |
| 1008 0000005c lwz r2,0x60(r30) ; | |
| 1009 00000060 addi r0,r2,0x7b ; | |
| 1010 00000064 stw r0,0x60(r30) ; | |
| 1011 00000068 lwz r0,0x40(r30) ; | |
| 1012 0000006c or r3,r0,r0 ; | |
| 1013 00000070 bl _f1 ; call f1(struct Trivial) | |
| 1014 00000074 lwz r2,0x60(r30) ; | |
| 1015 00000078 addi r0,r2,0xff85 ; | |
| 1016 0000007c stw r0,0x60(r30) ; | |
| 1017 00000080 addi r0,r30,0x70 ; | |
| 1018 00000084 addi r2,r30,0x50 ; | |
| 1019 00000088 or r3,r0,r0 ; | ptr to dest of copy of n | |
| 1020 0000008c or r4,r2,r2 ; | copy n ptr to n | |
| 1021 00000090 bl 0x120 ; __ZN10NonTrivialC1ERKS_ ; / NonTrivial::NonTrivial(const NonTrivial&) / copy ctor | |
| 1022 00000094 addi r0,r30,0x70 ; \ | |
| 1023 00000098 or r3,r0,r0 ; | f2 arg 0 (ptr to copy of struct NonTrivial), via ptr as non-trivial | |
| 1024 0000009c bl _f2 ; call f2(struct NonTrivial) | |
| 1025 000000a0 lwz r2,0x60(r30) ; | |
| 1026 000000a4 addi r0,r2,0xfff4 ; | |
| 1027 000000a8 stw r0,0x60(r30) ; | |
| 1028 000000ac lwz r1,_f1(r1) ; | |
| 1029 000000b0 lwz r0,0x8(r1) ; | |
| 1030 000000b4 mtspr lr,r0 ; | |
| 1031 000000b8 lmw r30,0xfff8(r1) ; | |
| 1032 000000bc blr ; | |
| 1033 | |
| 1034 ; ... snip, removed code of ctor and copy ctor ... | |
| 1035 | |
| 1036 | |
| 1037 | |
| 955 ; vim: ft=asm | 1038 ; vim: ft=asm |
| 956 | 1039 |