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make debug() output more useful

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This change does several things. First, and most important, it allows
dumping the "n" most recent stack frames on each debug() call. Second,
it demangles the C++ symbols. Third, it prepends each debug() message
with the debug level.

Unrelated to the above I've replaced all `assert(!is_forked_child());`
statements with `ASSERT_IS_NOT_FORKED_CHILD()` for consistency.
This commit is contained in:
Kurtis Rader
2016-05-15 19:45:02 -07:00
parent d55113b5b5
commit 73f2992a2e
7 changed files with 114 additions and 44 deletions
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2
doc_src/fish.txt
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@@ -25,4 +25,6 @@ The following options are available:
- `-v` or `--version` display version and exit
- `-D` or `--debug-stack-frames=DEBUG_LEVEL` specify how many stack frames to display when debug messages are written. The default is zero. A value of 3 or 4 is usually sufficient to gain insight into how a given debug call was reached but you can specify a value up to 128.
The fish exit status is generally the exit status of the last foreground command. If fish is exiting because of a parse error, the exit status is 127.