I gave up to introduce the optimization that skips pc motion by checking
C code's line number. The same code can often be shared by multiple
program counters and it's so hard to achieve the optimization in MJIT's
architecture.
Reverting to improve performance by removing -g1 and to remove so file
when it becomes not necessary.
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is configured now, to force -Wl,--compress-debug-sections=no
for MJIT only when the option is used in MJIT_DLDFLAGS.
This needs to be done in configure.ac to resolve build failure like
https://travis-ci.org/ruby/ruby/builds/415120662.
Makefile.in: define it in mjit_config.h
mjit_worker.c: replace hard-coded flag to MJIT_DLDFLAGS_NOCOMPRESS
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on ELF.
I need symbol name and line number to lazily create program counter for
optimization on ELF binary.
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on addr2line.c, if --jit-save-temps is specified.
I'm going to use the line number to lazily create program counter to
improve the performance degraded in r64283.
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on MJIT worker. That may trigger GC. And handled strdup failure instead.
mjit_compile.c: update comment about GC
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so that related things are placed closely.
Sorry for mixing them in previous commits...
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instead of linking functions with mjit_worker.o.
In the r64285's structure, we needed to publish some variables with
mjit_ prefix. But ideally those variables should be completely private
in mjit.o (or old mjit_worker.o), and it was hard.
So I chose an approach similar to vm*.c for mjit.c and mjit_worker.c.
I believe mjit_compile.c is still nice to be separated.
After this commit, I'll remove the mjit_ prefix again...
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from mjit.c because it's executed only on MJIT worker thread.
Instead of that, `valid_class_serials` is shared with mjit_ prefix.
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which was just forgotten.
mjit.c: ditto
mjit_internal.h: moved some macros only used by mjit_worker.c to it.
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The motivation of this change is to make sure rb_funcall or GC-related
functions are not called on worker-related code. Currently such
functions are used in some places and I believe it's partly because it's
hard to identify which part is called on MJIT worker thread.
Now, mjit.c is safe to use them but we know we need to safely deal with
mjit_compile.c, mjit_worker.c and mjit_internal.h.
mjit_compile.c: update the comment about it
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