Mercurial > pub > dyncall > dyncall
diff doc/disas_examples/sparc.sparc.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 | c73c59c8b553 |
| children | fc614cb865c6 |
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--- a/doc/disas_examples/sparc.sparc.disas Mon Mar 21 18:11:38 2022 +0100 +++ b/doc/disas_examples/sparc.sparc.disas Wed Mar 23 15:24:31 2022 +0100 @@ -1000,5 +1000,86 @@ +; ---------- C++ trivial and non-trivial aggrs passed to C funcs ----------> +; +; struct Trivial { int a; }; +; struct NonTrivial { int a; NonTrivial() : a(0) {} NonTrivial(const NonTrivial& rhs) : a(rhs.a) { } }; +; +; extern "C" { +; +; void f1(struct Trivial s) { } +; void f2(struct NonTrivial s) { } +; +; void f() +; { +; struct Trivial t; +; struct NonTrivial n; +; int a=1; +; a += 123; +; f1(t); +; a -= 123; +; f2(n); +; a -= 12; +; } +; } + + + +; output from debian-4.0_r3-sparc w/ gcc 4.1.2 + +00010484 <f1>: + 10484: 9d e3 bf 98 save %sp, -104, %sp + 10488: 81 e8 00 00 restore + 1048c: 81 c3 e0 08 retl + 10490: 01 00 00 00 nop + +00010494 <f2>: + 10494: 9d e3 bf 98 save %sp, -104, %sp + 10498: f0 27 a0 44 st %i0, [ %fp + 0x44 ] + 1049c: 81 e8 00 00 restore + 104a0: 81 c3 e0 08 retl + 104a4: 01 00 00 00 nop + +000104a8 <f>: + 104a8: 9d e3 bf 80 save %sp, -128, %sp ; + 104ac: 82 07 bf e8 add %fp, -24, %g1 ; + 104b0: 90 10 00 01 mov %g1, %o0 ; + 104b4: 40 00 00 26 call 1054c <_ZN10NonTrivialC1Ev> ; NonTrivial::NonTrivial() / ctor + 104b8: 01 00 00 00 nop ; + 104bc: 82 10 20 01 mov 1, %g1 ! 1 <_init-0x102cb> ; + 104c0: c2 27 bf f4 st %g1, [ %fp + -12 ] ; + 104c4: c2 07 bf f4 ld [ %fp + -12 ], %g1 ; + 104c8: 82 00 60 7b add %g1, 0x7b, %g1 ; + 104cc: c2 27 bf f4 st %g1, [ %fp + -12 ] ; + 104d0: c2 07 bf ec ld [ %fp + -20 ], %g1 ; + 104d4: c2 27 bf e4 st %g1, [ %fp + -28 ] ; + 104d8: 82 07 bf e4 add %fp, -28, %g1 ; + 104dc: 90 10 00 01 mov %g1, %o0 ; + 104e0: 7f ff ff e9 call 10484 <f1> ; call f1(struct Trivial) + 104e4: 01 00 00 00 nop ; + 104e8: c2 07 bf f4 ld [ %fp + -12 ], %g1 ; + 104ec: 82 00 7f 85 add %g1, -123, %g1 ; + 104f0: c2 27 bf f4 st %g1, [ %fp + -12 ] ; + 104f4: 82 07 bf f0 add %fp, -16, %g1 ; + 104f8: 84 07 bf e8 add %fp, -24, %g2 ; + 104fc: 90 10 00 01 mov %g1, %o0 ; | ptr to dest of copy of n + 10500: 92 10 00 02 mov %g2, %o1 ; | copy n ptr to n + 10504: 40 00 00 19 call 10568 <_ZN10NonTrivialC1ERKS_> ; | NonTrivial::NonTrivial(const NonTrivial&) / copy ctor + 10508: 01 00 00 00 nop ; + 1050c: 82 07 bf f0 add %fp, -16, %g1 ; | + 10510: 90 10 00 01 mov %g1, %o0 ; | f2 arg 0 (ptr to copy of struct NonTrivial), via ptr as non-trivial + 10514: 7f ff ff e0 call 10494 <f2> ; call f2(struct NonTrivial) + 10518: 01 00 00 00 nop ; + 1051c: c2 07 bf f4 ld [ %fp + -12 ], %g1 ; + 10520: 82 00 7f f4 add %g1, -12, %g1 ; + 10524: c2 27 bf f4 st %g1, [ %fp + -12 ] ; + 10528: 81 e8 00 00 restore ; + 1052c: 81 c3 e0 08 retl ; + 10530: 01 00 00 00 nop ; + + ; ... snip, removed code of ctor and copy ctor ... + + + ; vim: ft=asm