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To mitigate PR10424, we switched to building a separate tracequery
module for each tracepoint header, so a bad header wouldn't break all of
the others. However, with recent kernels that leads to ~18 make
commands, which adds up quickly in time. It's cached, so that's not too
bad, but as a developer who rebuilds stap frequently, it gets annoying.
If we're going to call 18 makes, it's worth it to start with one bigger
make that covers all the headers at once (like we used to). If that one
fails, we can still fall back to compiling individually.
FWIW, the failing ext4.h header was only created in 2.6.31, and was
fixed before 2.6.32, so the specific failure in PR10424 has a fairly
small window.
* buildrun.cxx (make_tracequery): Just take a single vector of headers.
* hash.cxx (find_tracequery_hash): Deal with multiple headers.
* tapsets.cxx (tracepoint_builder::get_tracequery_module): Ditto.
(tracepoint_builder::init_dw): Attempt all system headers together,
and if that fails, try again individually.
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With the current monolithic tracepoint query module, a failure in any of
the discovered tracepoint headers means that you can't use any of the
others either. This patch creates a separate query module for each
header so they can pass or fail independently.
* buildrun.cxx (make_tracequery): take a single header name instead of
globbing for everything we can find.
* hash.cxx (find_tracequery_hash): name the header file we're hashing.
* tapsets.cxx (tracepoint_query::handle_query_func): make sure we don't
duplicate tracepoints found through different headers.
(tracepoint_builder::get_tracequery_module): get a header's module
(tracepoint_builder::init_dw): glob for all tracepoint headers, and
feed all their modules into dwflpp.
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The special syntax to generate a module for type information is now:
- "kernel<path/to/header.h>" to use the kernel's build environment
- "<path/to/header.h>" to use no special build environment, and so use
gcc's default parameters only (for user mode).
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* tapsets.cxx (tracepoint_extra_headers): New function to return
needed header file names.
(emit_module_decls): Emit them.
* buildrun.cxx (make_tracequery): Emit them.
* testsuite/systemtap.base/tracepoints.exp: Rewrite to exercise
building each tracepoint.
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* session.h (systemtap_session): add tracepoint_derived_probes
* buildrun.cxx (make_tracequery): New - builds a kernel module that
hijacks the tracepoint declarations, so we can query debuginfo.
* buildrun.h: declare above
* tapsets.cxx (tracepoint_builder): New builder for tracepoint
probes. For now it just handles the initialization to build the
tracequery kernel module.
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* main.cxx: Restored pre-10-08 version: moved uprobes build to
buildrun.cxx.
* buildrun.cxx: Reworked uprobes build so that the resulting
Module.symvers can be used in building the stap-generated
module. If user isn't root, call verify_uprobes_uptodate()
rather than trying (and failing) to rebuild uprobes.ko.
* buildrun.h: uprobes_enabled() and make_uprobes() are no
longer extern.
* runtime/uprobes/Makefile: Added uprobes.ko target for use
by verify_uprobes_uptodate().
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* main.cxx: Add pass 4.5: make uprobes.ko in runtime/uprobes
* buildrun.cxx: Add uprobes_enabled() and make_uprobes().
Factor run_make_cmd() out of compile_pass().
* buildrun.h: Add uprobes_enabled and make_uprobes decls.
* tapsets.cxx: Do correct #include for modprobed uprobes.ko;
set need_uprobes in pass 2.
* session.h: Add need_uprobes
* runtime/staprun/common.c: Add -u option -> need_uprobes
* runtime/staprun/staprun_funcs.c: Generalize insert_module()
to support inserting uprobes.ko.
* runtime/staprun/staprun.c: Add enable_uprobes(). insert_module
call becomes insert_stap_module().
* runtime/staprun/staprun.h: Reflect insert_module() and
need_uprobes changes
* runtime/uprobes/*.[c,h]: uprobes is built as a module,
rather than included into the source of the stap-generated
module.
* runtime/uprobes/Makefile: Added
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* elaborate.h (systemtap_session): Add more command-line arguments.
* staptree.h (verbose): Bad global, no donut.
* elaborate.cxx: Temporarily disable verbose variable access.
* main.cxx: Support more arguments, build/run passes. Revamp
temporary file generation and partial-pass output generation.
* tapsets.cxx, translate.cxx: Emit just enough extra punctuation
and fluff to make generated probe pass -Werror.
* buildrun.cxx, buildrun.h: New files for passes 4/5. Partial
support for build pass, nothing on probe execution yet.
* testsuite/transok/*.stp: Force just -p3, now that -p4/5 exist.
* Makefile.am, Makefile.in: Corresponding changes.
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