Hi Paul,
thanks. I have incorporated your diffs, *SVN 1752*.
Please check on your Apple since I don't own one (*⎕FIO ¯16*
to provoke a stack dump).
I was also wondering where macro *_APPLE_* is defined. In a header file
(which ?) or with -D on the command line? In the latter case we could let
./configure set the macro (for that I would need to know the output of
the *uname* command on your machine).
Best Regards,
Jürgen
On 2/12/24 23:40, Paul Rockwell wrote:
I've found that stack traces don't display correctly with GNU APL on
macOS platforms (Intel and Apple Silicon). Examining the source for
Backtrace.cc, I've found that function Backtrace::show_item() is
expecting the string passed to it to look like this:
// ./apl(_ZN10APL_parser9nextTokenEv+0x1dc) [0x80778dc]
// │││││ │││││ │││││││││
// └┴┴┴┴─── program name │││││ └┴┴┴┴┴┴┴┴───── abs_addr
// └┴┴┴┴───────────────── asm_offset
The macOS system function backtrace_symbols() - called by
Backtrace::show() returns the strings in this format:
//
// 14 apl 0x00000001000a93f0
_ZN9Workspace19immediate_executionEb + 68
// ││└┴┴─── program name ││││││││││││││││││
││││││││││││││││││|||||||||||||||||| └┴─── asm_offset
// └┴─── stack level ││││││││││││││││││
└┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴─── function name
// └┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴┴───── abs_addr
//
These strings don't match what the code is looking for, so the stack
trace doesn't contain any useful information.
I prototyped some changes to Backtrace::show_item() to be able to
recognize that GNU APL is being built on Apple macOS, and parse the
macOS backtrace_symbols() string format. The resulting code seems to
compile and work correctly on Intel Linux and macOS (both on Intel and
Apple Silicon CPUs).
I've attached the diffs between SVN 1745 and my changed code. (I also
made some other changes to the code to reflect use of nullptr and '\0'
instead of the number 0 to improve the contextual clarity of some of
the code. There are also a couple of changes to remove some compiler
warnings on macOS for unreachable code)
You're welcome to use them if you find them useful.
- Paul Rockwell
