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Diffstat (limited to 'REORG.TODO/include/stap-probe.h')
-rw-r--r-- | REORG.TODO/include/stap-probe.h | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/REORG.TODO/include/stap-probe.h b/REORG.TODO/include/stap-probe.h new file mode 100644 index 0000000000..d45b0466bc --- /dev/null +++ b/REORG.TODO/include/stap-probe.h @@ -0,0 +1,77 @@ +/* Macros for defining Systemtap <sys/sdt.h> static probe points. + Copyright (C) 2012-2017 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <http://www.gnu.org/licenses/>. */ + +#ifndef _STAP_PROBE_H +#define _STAP_PROBE_H 1 + +#ifdef USE_STAP_PROBE + +# include <sys/sdt.h> + +/* Our code uses one macro LIBC_PROBE (name, n, arg1, ..., argn). + + Without USE_STAP_PROBE, that does nothing but evaluates all + its arguments (to prevent bit rot, unlike e.g. assert). + + Systemtap's header defines the macros STAP_PROBE (provider, name) and + STAP_PROBEn (provider, name, arg1, ..., argn). For "provider" we paste + in MODULE_NAME (libc, libpthread, etc.) automagically. + + The format of the arg parameters is discussed here: + + https://sourceware.org/systemtap/wiki/UserSpaceProbeImplementation + + The precise details of how register names are specified is + architecture specific and can be found in the gdb and SystemTap + source code. */ + +# define LIBC_PROBE(name, n, ...) \ + LIBC_PROBE_1 (MODULE_NAME, name, n, ## __VA_ARGS__) + +# define LIBC_PROBE_1(lib, name, n, ...) \ + STAP_PROBE##n (lib, name, ## __VA_ARGS__) + +# define STAP_PROBE0 STAP_PROBE + +# define LIBC_PROBE_ASM(name, template) \ + STAP_PROBE_ASM (MODULE_NAME, name, template) + +# define LIBC_PROBE_ASM_OPERANDS STAP_PROBE_ASM_OPERANDS + +#else /* Not USE_STAP_PROBE. */ + +# ifndef __ASSEMBLER__ +/* Evaluate all the arguments and verify that N matches their number. */ +# define LIBC_PROBE(name, n, ...) STAP_PROBE##n (__VA_ARGS__) + +# define STAP_PROBE0() +# define STAP_PROBE1(a1) +# define STAP_PROBE2(a1, a2) +# define STAP_PROBE3(a1, a2, a3) +# define STAP_PROBE4(a1, a2, a3, a4) + +# else +# define LIBC_PROBE(name, n, ...) /* Nothing. */ +# endif + +# define LIBC_PROBE_ASM(name, template) /* Nothing. */ +# define LIBC_PROBE_ASM_OPERANDS(n, ...) /* Nothing. */ + +#endif /* USE_STAP_PROBE. */ + +#endif /* stap-probe.h */ |