Hi,
I was experimenting with gtk3 a bit and a simple program was failing to
execute properly.
It's very simple:
gtk_init(@argc, @argv);
WType := gtk_window_get_type();
WinClass := g_type_class_ref( WType );
assembler is like so:
WType is -0x20(%rbp)
1 00000000004AD18E e875eafeff callq 0x49bc08 <gtk_init@plt>
2 00000000004AD193 e8a0e5ffff callq 0x4ab738 <gtk_window_get_type@plt>
3 00000000004AD198 488945e0 mov %rax,-0x20(%rbp)
4 00000000004AD19C 488b75e0 mov -0x20(%rbp),%rsi
5 00000000004AD1A0 488d7dd8 lea -0x28(%rbp),%rdi
6 00000000004AD1A4 e85f4bffff callq 0x4a1d08 <g_type_class_ref@plt>
7 00000000004AD1A9 488b45d8 mov -0x28(%rbp),%rax
8 00000000004AD1AD 488945f0 mov %rax,-0x10(%rbp)
9 00000000004AD1B1 488b45f0 mov -0x10(%rbp),%rax
shouldn't line 4 be "mov -0x20(%rbp),%rdi"
Line 5 shouldn't be there?
Line 7 overwrites the returned value before we've copied it anywhere?
Here's part of the assembly fpc generated:
# [39] begin
subq $280,%rsp
.Lc7:
# Var Win located in register rax
# Var WinClass located in register rax
# Var P2 located in register rsi
# Var WType located in register rsi
movq %rbx,264(%rsp)
movq %r12,272(%rsp)
.Ll12:
# [40] gtk_init(@argc, @argv);
movq $operatingsystem_parameter_argv,%rsi
movq $operatingsystem_parameter_argc,%rdi
call gtk_init
.Ll13:
# [41] WType := gtk_window_get_type();
call gtk_window_get_type
movq %rax,%rsi
.Ll14:
# [42] WinClass:=PGtkWindowClass(g_type_class_ref(WType));
movq %rsp,%rdi
call g_type_class_ref
movq (%rsp),%rax
I've got the same problem with fpc 2.5.1 and 2.7.1. I'll try 2.4.4 as
soon as it's downloaded.
Same result with 2.4.4
Regards,
Andrew Haines
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