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traces: provide a means to get short m4 traces

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Let --trace=m4-early dump all the logs from the start (as --trace=m4
used to do), and have --trace=m4 now start traces only when actually
working of the user's grammar.

Can make a big difference in the case of small inputs.  E.g.

    $ bison -S tests/testsuite.dir/001/input.m4 tests/testsuite.dir/001/input.y --trace=m4 |& wc
       3952   19446  251068
    $ bison -S tests/testsuite.dir/001/input.m4 tests/testsuite.dir/001/input.y --trace=m4-early |& wc
      19491  131904 1830495

* data/skeletons/traceon.m4: New.
* src/getargs.h, src/getargs.c: Introduce --trace=m4-early.
* src/output.c (output_skeleton): Adjust for --trace=m4 and --trace=m4-early.
This commit is contained in:
Akim Demaille
2020-05-21 18:02:17 +02:00
parent 94952779b6
commit 1ebc2ac55c
5 changed files with 19 additions and 12 deletions
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data/skeletons/traceon.m4 Normal file
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dnl GNU M4 treats -dV in a position-independent manner.
m4_debugmode(V)m4_traceon()dnl