llvm-project/llvm/tools/bugpoint
David Blaikie 4a60d370e8 bugpoint: disabling symbolication of bugpoint-executed programs
Initial implementation - needs similar work/testing for other tools
bugpoint invokes (llc, lli I think, maybe more).

Alternatively (as suggested by chandlerc@) an environment variable could
be used. This would allow the option to pass transparently through user
scripts, pass to compilers if they happened to be LLVM-ish, etc.

I worry a bit about using cl::opt in the crash handling code - LLVM
might crash early, perhaps before the cl::opt is properly initialized?
Or at least before arguments have been parsed?

 - should be OK since it defaults to "pretty", so if the crash is very
 early in opt parsing, etc, then crash reports will still be symbolized.

I shyed away from doing this with an environment variable when I
realized that would require copying the existing environment and
appending the env variable of interest. But it seems there's no existing
LLVM API for accessing the environment (even the Support tests for
process launching have their own ifdefs for getting the environment). It
could be added, but seemed like a higher bar/untested codepath to
actually add environment variables.

Most importantly, this reduces the runtime of test/BugPoint/metadata.ll
in a split-dwarf Debug build from 1m34s to 6.5s by avoiding a lot of
symbolication. (this wasn't a problem for non-split-dwarf builds only
because the executable was too large to map into memory (due to bugpoint
setting a 400MB memory (including address space - not sure why? Going to
remove that) limit on the child process) so symbolication would fail
fast & wouldn't spend all that time parsing DWARF, etc)

Reviewers: chandlerc, dannyb

Differential Revision: https://reviews.llvm.org/D33804

llvm-svn: 305056
2017-06-09 07:29:03 +00:00
..
BugDriver.cpp bugpoint: Return Errors instead of passing around strings 2016-09-06 17:18:22 +00:00
BugDriver.h bugpoint: Return Errors instead of passing around strings 2016-09-06 17:18:22 +00:00
CMakeLists.txt [CMake] bugpoint depends on intrinsics_gen 2016-11-18 23:25:30 +00:00
CrashDebugger.cpp [Bugpoint] Use boolean AND instead of bitwise AND (PR32660) 2017-04-14 15:21:15 +00:00
ExecutionDriver.cpp Turn cl::values() (for enum) from a vararg function to using C++ variadic template 2016-10-08 19:41:06 +00:00
ExtractFunction.cpp Suppress all uses of LLVM_END_WITH_NULL. NFC. 2017-05-09 19:31:13 +00:00
FindBugs.cpp Remove uses of deprecated std::random_shuffle in the LLVM code base. Reviewed as https://reviews.llvm.org/D29780. 2017-02-16 14:37:03 +00:00
LLVMBuild.txt
ListReducer.h Remove uses of deprecated std::random_shuffle in the LLVM code base. Reviewed as https://reviews.llvm.org/D29780. 2017-02-16 14:37:03 +00:00
Miscompilation.cpp Module::getOrInsertFunction is using C-style vararg instead of variadic templates. 2017-04-11 15:01:18 +00:00
OptimizerDriver.cpp bugpoint: disabling symbolication of bugpoint-executed programs 2017-06-09 07:29:03 +00:00
ToolRunner.cpp Allow use of spaces in Bugpoint ‘--compile-command’ argument 2017-03-02 16:50:48 +00:00
ToolRunner.h bugpoint: Return Errors instead of passing around strings 2016-09-06 17:18:22 +00:00
bugpoint.cpp Do not inline hot callsites for samplepgo in thinlto compile phase. 2017-03-21 19:55:36 +00:00