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tracing: dedup TRACE macros & rename to TRACEPOINT

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This deduplicates the TRACEx macros by using systemtaps STAP_PROBEV[0]
variadic macro instead of the DTrace compability DTRACE_PROBE[1] macros.
Bitcoin Core never had DTrace tracepoints, so we don't need to use the
drop-in replacement for it. As noted in pr25541[2], these macros aren't
compatibile with DTrace on macOS anyway.

This also renames the TRACEx macro to TRACEPOINT to clarify what the
macro does: inserting a tracepoint vs tracing (logging) something.

[0]: https://sourceware.org/git/?p=systemtap.git;a=blob;f=includes/sys/sdt.h;h=24d5e01c37805e55c36f7202e5d4e821b85167a1;hb=ecab2afea46099b4e7dfd551462689224afdbe3a#l407
[1]: https://sourceware.org/git/?p=systemtap.git;a=blob;f=includes/sys/sdt.h;h=24d5e01c37805e55c36f7202e5d4e821b85167a1;hb=ecab2afea46099b4e7dfd551462689224afdbe3a#l490
[2]: https://github.com/bitcoin/bitcoin/pull/25541/files#diff-553886c5f808e01e3452c7b21e879cc355da388ef7680bf310f6acb926d43266R30-R31

Co-authored-by: Martin Leitner-Ankerl <martin.ankerl@gmail.com>
This commit is contained in:
0xb10c
2023-11-23 11:06:17 +01:00
parent 1c7ca6e64d
commit d524c1ec06
11 changed files with 62 additions and 70 deletions
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7
cmake/module/FindUSDT.cmake
View File

@@ -36,13 +36,16 @@ if(USDT_INCLUDE_DIR)
include(CheckCXXSourceCompiles)
set(CMAKE_REQUIRED_INCLUDES ${USDT_INCLUDE_DIR})
check_cxx_source_compiles("
// Setting SDT_USE_VARIADIC lets systemtap (sys/sdt.h) know that we want to use
// the optional variadic macros to define tracepoints.
#define SDT_USE_VARIADIC 1
#include <sys/sdt.h>
int main()
{
DTRACE_PROBE(context, event);
STAP_PROBEV(context, event);
int a, b, c, d, e, f, g;
DTRACE_PROBE7(context, event, a, b, c, d, e, f, g);
STAP_PROBEV(context, event, a, b, c, d, e, f, g);
}
" HAVE_USDT_H
)