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comparison doc/disas_examples/mips.o32.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 | 6c72cb768099 |
| children | fd9ba3a6d348 |
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| 496:da5232da6270 | 497:cb19b2fe2422 |
|---|---|
| 1752 154: 27bd0060 addiu sp,sp,96 | 1752 154: 27bd0060 addiu sp,sp,96 |
| 1753 ... | 1753 ... |
| 1754 | 1754 |
| 1755 | 1755 |
| 1756 | 1756 |
| 1757 ; ---------- C++ trivial and non-trivial aggrs passed to C funcs ----------> | |
| 1758 ; | |
| 1759 ; struct Trivial { int a; }; | |
| 1760 ; struct NonTrivial { int a; NonTrivial() : a(0) {} NonTrivial(const NonTrivial& rhs) : a(rhs.a) { } }; | |
| 1761 ; | |
| 1762 ; extern "C" { | |
| 1763 ; | |
| 1764 ; void f1(struct Trivial s) { } | |
| 1765 ; void f2(struct NonTrivial s) { } | |
| 1766 ; | |
| 1767 ; void f() | |
| 1768 ; { | |
| 1769 ; struct Trivial t; | |
| 1770 ; struct NonTrivial n; | |
| 1771 ; int a=1; | |
| 1772 ; a += 123; | |
| 1773 ; f1(t); | |
| 1774 ; a -= 123; | |
| 1775 ; f2(n); | |
| 1776 ; a -= 12; | |
| 1777 ; } | |
| 1778 ; } | |
| 1779 | |
| 1780 | |
| 1781 | |
| 1782 ; output from freebsd-12.0_r333647-malta_mipsebhf w/ gcc 4.2.1 *and* -mhard-float -----> | |
| 1783 | |
| 1784 004008c0 <f1>: | |
| 1785 4008c0: 3c1c0002 lui gp,0x2 | |
| 1786 4008c4: 279c8330 addiu gp,gp,-31952 | |
| 1787 4008c8: 0399e021 addu gp,gp,t9 | |
| 1788 4008cc: 27bdfff8 addiu sp,sp,-8 | |
| 1789 4008d0: afbe0000 sw s8,0(sp) | |
| 1790 4008d4: 03a0f021 move s8,sp | |
| 1791 4008d8: afc40008 sw a0,8(s8) | |
| 1792 4008dc: 03c0e821 move sp,s8 | |
| 1793 4008e0: 8fbe0000 lw s8,0(sp) | |
| 1794 4008e4: 03e00008 jr ra | |
| 1795 4008e8: 27bd0008 addiu sp,sp,8 | |
| 1796 | |
| 1797 004008ec <f2>: | |
| 1798 4008ec: 3c1c0002 lui gp,0x2 | |
| 1799 4008f0: 279c8304 addiu gp,gp,-31996 | |
| 1800 4008f4: 0399e021 addu gp,gp,t9 | |
| 1801 4008f8: 27bdfff8 addiu sp,sp,-8 | |
| 1802 4008fc: afbe0000 sw s8,0(sp) | |
| 1803 400900: 03a0f021 move s8,sp | |
| 1804 400904: afc40008 sw a0,8(s8) | |
| 1805 400908: 03c0e821 move sp,s8 | |
| 1806 40090c: 8fbe0000 lw s8,0(sp) | |
| 1807 400910: 03e00008 jr ra | |
| 1808 400914: 27bd0008 addiu sp,sp,8 | |
| 1809 | |
| 1810 00400918 <f>: | |
| 1811 400918: 3c1c0002 lui gp,0x2 ; | |
| 1812 40091c: 279c82d8 addiu gp,gp,-32040 ; | |
| 1813 400920: 0399e021 addu gp,gp,t9 ; | |
| 1814 400924: 27bdffd0 addiu sp,sp,-48 ; | |
| 1815 400928: afbf002c sw ra,44(sp) ; | |
| 1816 40092c: afbe0028 sw s8,40(sp) ; | |
| 1817 400930: 03a0f021 move s8,sp ; | |
| 1818 400934: afbc0010 sw gp,16(sp) ; | |
| 1819 400938: 27c20024 addiu v0,s8,36 ; | |
| 1820 40093c: 00402021 move a0,v0 ; | |
| 1821 400940: 8f998064 lw t9,-32668(gp) ; | | |
| 1822 400944: 0320f809 jalr t9 ; | NonTrivial::NonTrivial() / ctor | |
| 1823 400948: 00000000 nop ; | |
| 1824 40094c: 8fdc0010 lw gp,16(s8) ; | |
| 1825 400950: 24020001 li v0,1 ; | |
| 1826 400954: afc20018 sw v0,24(s8) ; | |
| 1827 400958: 8fc20018 lw v0,24(s8) ; | |
| 1828 40095c: 2442007b addiu v0,v0,123 ; | |
| 1829 400960: afc20018 sw v0,24(s8) ; | |
| 1830 400964: 8fc40020 lw a0,32(s8) ; | |
| 1831 400968: 8f998060 lw t9,-32672(gp) ; | | |
| 1832 40096c: 0320f809 jalr t9 ; | call f1(struct Trivial) | |
| 1833 400970: 00000000 nop ; | |
| 1834 400974: 8fdc0010 lw gp,16(s8) ; | |
| 1835 400978: 8fc20018 lw v0,24(s8) ; | |
| 1836 40097c: 2442ff85 addiu v0,v0,-123 ; | |
| 1837 400980: afc20018 sw v0,24(s8) ; | |
| 1838 400984: 27c2001c addiu v0,s8,28 ; | |
| 1839 400988: 27c30024 addiu v1,s8,36 ; | |
| 1840 40098c: 00402021 move a0,v0 ; | ptr to dest of copy of n | |
| 1841 400990: 00602821 move a1,v1 ; | ptr to n | |
| 1842 400994: 8f998050 lw t9,-32688(gp) ; | copy n | | |
| 1843 400998: 0320f809 jalr t9 ; | | NonTrivial::NonTrivial(const NonTrivial&) / copy ctor | |
| 1844 40099c: 00000000 nop ; | |
| 1845 4009a0: 8fdc0010 lw gp,16(s8) ; | |
| 1846 4009a4: 27c2001c addiu v0,s8,28 ; get ptr to copy of n -> v0 | |
| 1847 4009a8: 00402021 move a0,v0 ; f2 arg 0 (ptr to copy of struct NonTrivial), via ptr as non-trivial | |
| 1848 4009ac: 8f998058 lw t9,-32680(gp) ; | | |
| 1849 4009b0: 0320f809 jalr t9 ; | call f2(struct NonTrivial) | |
| 1850 4009b4: 00000000 nop ; | |
| 1851 4009b8: 8fdc0010 lw gp,16(s8) ; | |
| 1852 4009bc: 8fc20018 lw v0,24(s8) ; | |
| 1853 4009c0: 2442fff4 addiu v0,v0,-12 ; | |
| 1854 4009c4: afc20018 sw v0,24(s8) ; | |
| 1855 4009c8: 03c0e821 move sp,s8 ; | |
| 1856 4009cc: 8fbf002c lw ra,44(sp) ; | |
| 1857 4009d0: 8fbe0028 lw s8,40(sp) ; | |
| 1858 4009d4: 03e00008 jr ra ; | |
| 1859 4009d8: 27bd0030 addiu sp,sp,48 ; | |
| 1860 | |
| 1861 ; ... snip, removed code of ctor and copy ctor ... | |
| 1862 | |
| 1863 | |
| 1864 | |
| 1757 ; vim: ft=asm | 1865 ; vim: ft=asm |
| 1758 | 1866 |