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10 Commits

Author SHA1 Message Date
Nathan Chancellor ef58ae86ba
[RISCV] Fix mcount name 
GCC's name for this symbol is _mcount, which the Linux kernel expects in
a few different place:

  $ echo 'int main(void) { return 0; }' | riscv32-linux-gcc -c -pg -o tmp.o -x c -

  $ llvm-objdump -dr tmp.o | grep mcount
                          0000000c:  R_RISCV_CALL _mcount

  $ echo 'int main(void) { return 0; }' | riscv64-linux-gcc -c -pg -o tmp.o -x c -

  $ llvm-objdump -dr tmp.o | grep mcount
                  000000000000000c:  R_RISCV_CALL _mcount

  $ echo 'int main(void) { return 0; }' | clang -c -pg -o tmp.o --target=riscv32-linux-gnu -x c -

  $ llvm-objdump -dr tmp.o | grep mcount
                          0000000a:  R_RISCV_CALL_PLT     mcount

  $ echo 'int main(void) { return 0; }' | clang -c -pg -o tmp.o --target=riscv64-linux-gnu -x c -

  $ llvm-objdump -dr tmp.o | grep mcount
                  000000000000000a:  R_RISCV_CALL_PLT     mcount

Set MCountName to "_mcount" in RISCVTargetInfo then prevent it from
getting overridden in certain OSTargetInfo constructors.

Reviewed By: MaskRay

Differential Revision: https://reviews.llvm.org/D98881

Signed-off-by: Nathan Chancellor <nathan@kernel.org>
 2021-03-24 18:11:37 -07:00
Arthur Eubanks 040c1b49d7 Move EntryExitInstrumentation pass location 
This seems to be more of a Clang thing rather than a generic LLVM thing,
so this moves it out of LLVM pipelines and as Clang extension hooks into
LLVM pipelines.

Move the post-inline EEInstrumentation out of the backend pipeline and
into a late pass, similar to other sanitizer passes. It doesn't fit
into the codegen pipeline.

Also fix up EntryExitInstrumentation not running at -O0 under the new
PM. PR49143

Reviewed By: hans

Differential Revision: https://reviews.llvm.org/D97608
 2021-03-01 10:08:10 -08:00
Joerg Sonnenberger b79e61f8b3 Always use __mcount on NetBSD. Some platforms don't provide _mcount. 
llvm-svn: 337277
 2018-07-17 13:13:34 +00:00
Hans Wennborg 76c26c1dca Switch -mcount and -finstrument-functions to emit EnterExitInstrumenter attributes 
This updates -mcount to use the new attribute names (LLVM r318195), and
switches over -finstrument-functions to also use these attributes rather
than inserting instrumentation in the frontend.

It also adds a new flag, -finstrument-functions-after-inlining, which
makes the cygprofile instrumentation get inserted after inlining rather
than before.

Differential Revision: https://reviews.llvm.org/D39331

llvm-svn: 318199
 2017-11-14 21:13:27 +00:00
Simon Atanasyan 3606ebf6d6 [mips] Create the correct profiling symbol on Linux MIPS 
llvm-svn: 307627
 2017-07-11 06:19:01 +00:00
Manoj Gupta 162b40a850 [Clang] Handle interaction of -pg and no_instrument_function attribute. 
Summary:
Disable generation of counting-function attribute if no_instrument_function
attribute is present in function.
Interaction between -pg and no_instrument_function is the desired behavior
and matches gcc as well.
This is required for fixing a crash in Linux kernel when function tracing
is enabled.

Fixes PR33515.

Reviewers: hfinkel, rengolin, srhines, hans

Reviewed By: hfinkel

Subscribers: cfe-commits

Differential Revision: https://reviews.llvm.org/D34357

llvm-svn: 305728
 2017-06-19 18:45:03 +00:00
Honggyu Kim 2b0e424b2f [Frontend] Fix mcount inlining bug 
Since some profiling tools, such as gprof, ftrace, and uftrace, use
-pg option to generate a mcount function call at the entry of each
function. Function invocation can be detected by this hook function.

But mcount insertion is done before function inlining phase in clang,
sometime a function that already has a mcount call can be inlined in the
middle of another function.

This patch adds an attribute "counting-function" to each function
rather than emitting the mcount call directly in frontend so that this
attribute can be processed in backend. Then the mcount calls can be
properly inserted in backend after all the other optimizations are
completed.

Link: https://llvm.org/bugs/show_bug.cgi?id=28660

Reviewers: hans, rjmccall, hfinkel, rengolin, compnerd

Subscribers: shenhan, cfe-commits

Differential Revision: https://reviews.llvm.org/D22666

llvm-svn: 280355
 2016-09-01 11:29:21 +00:00
Joerg Sonnenberger 740f3f4a95 Create the correct profiling symbol on NetBSD. 
llvm-svn: 234636
 2015-04-10 21:02:53 +00:00
Hal Finkel ecdb454aa7 [PowerPC] Make -pg generate calls to _mcount not mcount 
At least on REL6 (Linux/glibc 2.12), the proper symbol for generating gprof
data is _mcount, not mcount. Prior to this change, compiling with -pg would
generate linking errors (because of unresolved references to mcount), after
this change -pg seems at least minimally functional.

llvm-svn: 205144
 2014-03-30 13:00:06 +00:00
Roman Divacky 5bc5151299 Add a testcase for the mcount profiling. 
llvm-svn: 125283
 2011-02-10 16:52:35 +00:00