Hi Kacper,
thanks, fixed in SVN 1050.
/// Jürgen
On 05/23/2018 04:20 AM, Kacper Gutowski
wrote:
Hi,
I'm pretty sure it worked at some point before,
but now (r1049) I encountered the following:
1.1÷0 ⍝ should signal DOMAIN ERROR like 1÷0 does
0
1J1÷0 ⍝ ditto
0
And when I tried to ensure division by zero doesn't happen
in the first place, I ran into this:
a←1.1× b←1 0
a÷b ⍝ no error expected here because 0÷0 should be just 1
DOMAIN ERROR
a÷b
^ ^
2⎕TF 'a'
a←1.1000000000000001 0
0≡a[2]
1
a[2]←0 ⍝ numerically the same
a÷b ⍝ but now it works
1.1 1
It's different on the first element, though:
a←1.1× b←0 1
a÷b ⍝ wrong result: 0 instead of 1
0 1.1
There's also this:
0J0÷0 ⍝ should be 1
0
And with larger arrays, I get crashes. Unfortunately it randomly crashes
in a number of different ways: sometimes a segfault with a stack trace,
sometimes without, and few times I saw it trap illegal instruction. It
seems to jump into some random location. It doesn't seem to depend on
compiler version because I get similar behavior with both gcc and clang,
but I'm not sure how reproducible it is otherwise:
a←12⍴0 ⋄ a[1]←1.1 ⋄ a÷0 ⍝ wrong result
0 1 1 1 1 1 1 1 1 1 1 1
a←12⍴0 ⋄ a[2]←1.1 ⋄ a÷0 ⍝ correct
DOMAIN ERROR
a÷0
^^
a←13⍴0 ⋄ a[2]←1.1 ⋄ a÷0 ⍝ crashes
====================================================
SEGMENTATION FAULT
----------------------------------------
-- Stack trace at main.cc:88
----------------------------------------
0x7F535AAECA87 __libc_start_main
0x56115F847CE5 main
0x56115F9C541D Workspace::immediate_execution(bool)
0x56115F89CCBF Command::process_line()
0x56115F89D5A4 Command::do_APL_expression(UCS_string&)
0x56115F89CD3F Command::finish_context()
0x56115F8A86E7 Executable::execute_body() const
0x56115F95E0B0 StateIndicator::run()
0x56115F8EB07E Prefix::reduce_statements()
0x56115F8E5F2B Prefix::reduce_A_F_B_()
0x56115F95741F Bif_F12_DIVIDE::eval_AB(Value_P, Value_P)
0x56115F95339F ScalarFunction::eval_scalar_AB(Value_P, Value_P, ErrorCode (Cell::*)(Cell*, Cell const*) const)
0x56115F952682 ScalarFunction::do_scalar_AB(ErrorCode&, Value_P, Value_P, ErrorCode (Cell::*)(Cell*, Cell const*) const)
0x56115F8AE677 FloatCell::bif_multiply(Cell*, Cell const*) const
0x7F535BE2EF50
0x56115F84D9DB
========================================
====================================================
Goodbye.
Session duration: 21.264 seconds
For completeness, here's what I get from gdb:
a←13⍴0 ⋄ a[2]←1.1 ⋄ a÷0
Program received signal SIGSEGV, Segmentation fault.
0x000000000000cb12 in ?? ()
(gdb) bt
#0 0x000000000000cb12 in ?? ()
#1 0x000055555564567d in FloatCell::bif_multiply (this=0x555555af1378,
Z=0x555555af23b8, A=0x555555af23b8) at FloatCell.cc:494
#2 0x00005555556e9682 in ScalarFunction::do_scalar_AB (
this=0x5555559fa320 <Bif_F12_DIVIDE::_fun>,
address@hidden: E_NO_ERROR, A=..., B=..., fun=<optimized out>)
at ScalarFunction.cc:500
#3 0x00005555556ea39f in ScalarFunction::eval_scalar_AB (
this=<optimized out>, A=..., B=..., fun=<optimized out>)
at ScalarFunction.cc:309
#4 0x00005555556ee41f in Bif_F12_DIVIDE::eval_AB (this=<optimized out>,
A=..., B=...) at ScalarFunction.hh:728
#5 0x000055555567cf2b in Prefix::reduce_A_F_B_ (this=0x555555aee600)
at Prefix.cc:1051
#6 0x000055555568207e in Prefix::reduce_statements (this=0x555555aee600)
at Prefix.cc:670
#7 0x00005555556f50b0 in StateIndicator::run (this=<optimized out>)
at StateIndicator.cc:399
#8 0x000055555563f6e7 in Executable::execute_body (this=<optimized out>)
at Executable.cc:256
#9 0x0000555555633d3f in Command::finish_context () at Command.cc:300
#10 0x00005555556345a4 in Command::do_APL_expression (line=...)
at Command.cc:288
#11 0x0000555555633bd4 in Command::process_line (line=...) at Command.cc:100
#12 0x0000555555633cbf in Command::process_line () at Command.cc:67
#13 0x000055555575c41d in Workspace::immediate_execution (exit_on_error=false)
at Workspace.cc:180
#14 0x00005555555dece5 in main (argc=<optimized out>, argv=<optimized out>)
at main.cc:480
(gdb) up
#1 0x000055555564567d in FloatCell::bif_multiply (this=0x555555af1378,
Z=0x555555af23b8, A=0x555555af23b8) at FloatCell.cc:494
494 if (!A->is_numeric()) return E_DOMAIN_ERROR;
(gdb) p A
$1 = (const Cell *) 0x555555af23b8
(gdb) p *A
$2 = {_vptr.Cell = 0x555555af2440, value = {aval = 512, cval = {
2.5296161067071823e-321, 6.3240402667679558e-322}, eval = 512,
ival = 512, fval = {u1 = {flt = 2.5296161067071823e-321, num = 512},
denominator = 128}, vptr = 0x200, next = 0x200, lval = 0x200, pval = {
valp = {value_p = 0x200}, owner = 0x80}}}
(gdb)
And similarly for complex:
a←13⍴0 ⋄ a[2]←1J0 ⋄ a÷0
Program received signal SIGSEGV, Segmentation fault.
0x0000003500000031 in ?? ()
(gdb) bt
#0 0x0000003500000031 in ?? ()
#1 0x0000555555636cc6 in ComplexCell::bif_multiply (this=<optimized out>,
Z=0x555555af23b8, A=<optimized out>) at ComplexCell.cc:293
#2 0x00005555556e9682 in ScalarFunction::do_scalar_AB (
this=0x5555559fa320 <Bif_F12_DIVIDE::_fun>,
address@hidden: E_NO_ERROR, A=..., B=..., fun=<optimized out>)
at ScalarFunction.cc:500
#3 0x00005555556ea39f in ScalarFunction::eval_scalar_AB (
this=<optimized out>, A=..., B=..., fun=<optimized out>)
at ScalarFunction.cc:309
#4 0x00005555556ee41f in Bif_F12_DIVIDE::eval_AB (this=<optimized out>,
A=..., B=...) at ScalarFunction.hh:728
#5 0x000055555567cf2b in Prefix::reduce_A_F_B_ (this=0x555555aee600)
at Prefix.cc:1051
#6 0x000055555568207e in Prefix::reduce_statements (this=0x555555aee600)
at Prefix.cc:670
#7 0x00005555556f50b0 in StateIndicator::run (this=<optimized out>)
at StateIndicator.cc:399
#8 0x000055555563f6e7 in Executable::execute_body (this=<optimized out>)
at Executable.cc:256
#9 0x0000555555633d3f in Command::finish_context () at Command.cc:300
#10 0x00005555556345a4 in Command::do_APL_expression (line=...)
at Command.cc:288
#11 0x0000555555633bd4 in Command::process_line (line=...) at Command.cc:100
#12 0x0000555555633cbf in Command::process_line () at Command.cc:67
#13 0x000055555575c41d in Workspace::immediate_execution (exit_on_error=false)
at Workspace.cc:180
#14 0x00005555555dece5 in main (argc=<optimized out>, argv=<optimized out>)
at main.cc:480
(gdb) up
#1 0x0000555555636cc6 in ComplexCell::bif_multiply (this=<optimized out>,
Z=0x555555af23b8, A=<optimized out>) at ComplexCell.cc:293
293 const APL_Complex z = A->get_complex_value() * cval();
(gdb)
In both cases, executing a method on A goes astray.
-k
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