From 9cd4747089e6b0d6ed6b2b6c75798912489c7bab Mon Sep 17 00:00:00 2001 From: Siddhesh Poyarekar Date: Wed, 19 Nov 2014 12:13:54 +0530 Subject: Add new macro IN_MODULE to identify module in which source is built The current scheme to identify which module a translation unit is built in depends on defining multiple macros IS_IN_* and also defining NOT_IN_libc if we're building a non-libc module. In addition, there is an IN_LIB macro that does effectively the same thing, but for different modules (notably the systemtap probes). This macro scheme unifies both ideas to use just one macro IN_MODULE and assign it a value depending on the module it is being built into. If the module is not defined, it defaults to MODULE_libc. Patches that follow will replace uses of IS_IN_* variables with the IS_IN() macro. libc-symbols.h has been converted already to give an example of how such a transition will look. Verified that there are no relevant binary changes. One source change that will crop up repeatedly is that of nscd_stat, since it uses the build timestamp as a constant in its logic. * Makeconfig (in-module): Get value of libof set for the translation unit. (CPPFLAGS): Use $(in-module). * Makerules: Don't suffix routine names for nonlib. * include/libc-modules.h: New file. * include/libc-symbols.h: Include libc-modules.h (IS_IN): New macro to replace IS_IN_* macros. * elf/Makefile: Set libof-* for each routine. * elf/rtld-Rules: Likewise. * extra-modules.mk: Likewise. * iconv/Makefile: Likewise. * iconvdata/Makefile: Likewise. * locale/Makefile: Likewise. * malloc/Makefile: Likewise. * nss/Makefile: Likewise. * sysdeps/gnu/Makefile: Likewise. * sysdeps/ieee754/ldbl-opt/Makefile: Likewise. * sysdeps/unix/sysv/linux/Makefile: Likewise. * sysdeps/s390/s390-64/Makefile: Likewise. * nscd/Makefile: Set libof-* for each routine. Set CFLAGS and CPPFLAGS for nscd instead of nonlib. --- include/libc-modules.h | 41 +++++++++++++++++++++++++++++++++++++++++ include/libc-symbols.h | 25 +++++++++++++++---------- 2 files changed, 56 insertions(+), 10 deletions(-) create mode 100644 include/libc-modules.h (limited to 'include') diff --git a/include/libc-modules.h b/include/libc-modules.h new file mode 100644 index 0000000..029b600 --- /dev/null +++ b/include/libc-modules.h @@ -0,0 +1,41 @@ +/* Valid values for the IN_MODULE macro, which is defined for each source file + during compilation to indicate which module it is to be built into. + + TODO: This file should eventually be auto-generated. */ +#define MODULE_libc 1 +#define MODULE_libpthread 2 +#define MODULE_rtld 3 +#define MODULE_libdl 4 +#define MODULE_libm 5 +#define MODULE_iconvprogs 6 +#define MODULE_iconvdata 7 +#define MODULE_lddlibc4 8 +#define MODULE_locale_programs 9 +#define MODULE_memusagestat 10 +#define MODULE_libutil 12 +#define MODULE_libBrokenLocale 13 +#define MODULE_libmemusage 15 +#define MODULE_libresolv 16 +#define MODULE_libnss_db 17 +#define MODULE_libnss_files 18 +#define MODULE_libnss_dns 19 +#define MODULE_libnss_compat 20 +#define MODULE_libnss_hesiod 21 +#define MODULE_libnss_nis 22 +#define MODULE_libnss_nisplus 23 +#define MODULE_libanl 24 +#define MODULE_librt 25 +#define MODULE_libSegFault 26 +#define MODULE_libthread_db 27 +#define MODULE_libcidn 28 +#define MODULE_libcrypt 29 +#define MODULE_libnsl 30 +#define MODULE_libpcprofile 31 +#define MODULE_librpcsvc 32 +#define MODULE_nscd 33 +#define MODULE_ldconfig 34 +#define MODULE_libnldbl 35 + +/* Catch-all for test modules and other binaries. */ +#define MODULE_nonlib 98 +#define MODULE_extramodules 99 diff --git a/include/libc-symbols.h b/include/libc-symbols.h index b1ac9db..58c3577 100644 --- a/include/libc-symbols.h +++ b/include/libc-symbols.h @@ -20,6 +20,11 @@ #ifndef _LIBC_SYMBOLS_H #define _LIBC_SYMBOLS_H 1 +/* Pull in definitions for the MODULE_* macros. */ +#include + +#define IS_IN(lib) (IN_MODULE == MODULE_##lib) + /* This file's macros are included implicitly in the compilation of every file in the C library by -imacros. @@ -448,7 +453,7 @@ for linking") If the function should be internal to multiple objects, say ld.so and libc.so, the best way is to use: - #if !defined NOT_IN_libc || defined IS_IN_rtld + #if IS_IN (libc) || IS_IN (rtld) hidden_proto (foo) #endif @@ -564,7 +569,7 @@ for linking") # define libc_hidden_data_ver(local, name) #endif -#ifdef IS_IN_rtld +#if IS_IN (rtld) # define rtld_hidden_proto(name, attrs...) hidden_proto (name, ##attrs) # define rtld_hidden_tls_proto(name, attrs...) hidden_tls_proto (name, ##attrs) # define rtld_hidden_def(name) hidden_def (name) @@ -584,7 +589,7 @@ for linking") # define rtld_hidden_data_ver(local, name) #endif -#ifdef IS_IN_libm +#if IS_IN (libm) # define libm_hidden_proto(name, attrs...) hidden_proto (name, ##attrs) # define libm_hidden_tls_proto(name, attrs...) hidden_tls_proto (name, ##attrs) # define libm_hidden_def(name) hidden_def (name) @@ -604,7 +609,7 @@ for linking") # define libm_hidden_data_ver(local, name) #endif -#ifdef IS_IN_libresolv +#if IS_IN (libresolv) # define libresolv_hidden_proto(name, attrs...) hidden_proto (name, ##attrs) # define libresolv_hidden_tls_proto(name, attrs...) \ hidden_tls_proto (name, ##attrs) @@ -625,7 +630,7 @@ for linking") # define libresolv_hidden_data_ver(local, name) #endif -#ifdef IS_IN_librt +#if IS_IN (librt) # define librt_hidden_proto(name, attrs...) hidden_proto (name, ##attrs) # define librt_hidden_tls_proto(name, attrs...) \ hidden_tls_proto (name, ##attrs) @@ -646,7 +651,7 @@ for linking") # define librt_hidden_data_ver(local, name) #endif -#ifdef IS_IN_libdl +#if IS_IN (libdl) # define libdl_hidden_proto(name, attrs...) hidden_proto (name, ##attrs) # define libdl_hidden_tls_proto(name, attrs...) \ hidden_tls_proto (name, ##attrs) @@ -667,7 +672,7 @@ for linking") # define libdl_hidden_data_ver(local, name) #endif -#ifdef IS_IN_libnss_files +#if IS_IN (libnss_files) # define libnss_files_hidden_proto(name, attrs...) hidden_proto (name, ##attrs) # define libnss_files_hidden_tls_proto(name, attrs...) \ hidden_tls_proto (name, ##attrs) @@ -688,7 +693,7 @@ for linking") # define libnss_files_hidden_data_ver(local, name) #endif -#ifdef IS_IN_libnsl +#if IS_IN (libnsl) # define libnsl_hidden_proto(name, attrs...) hidden_proto (name, ##attrs) # define libnsl_hidden_tls_proto(name, attrs...) \ hidden_tls_proto (name, ##attrs) @@ -709,7 +714,7 @@ for linking") # define libnsl_hidden_data_ver(local, name) #endif -#ifdef IS_IN_libnss_nisplus +#if IS_IN (libnss_nisplus) # define libnss_nisplus_hidden_proto(name, attrs...) hidden_proto (name, ##attrs) # define libnss_nisplus_hidden_tls_proto(name, attrs...) \ hidden_tls_proto (name, ##attrs) @@ -738,7 +743,7 @@ for linking") # define HIDDEN_BUILTIN_JUMPTARGET(name) HIDDEN_JUMPTARGET(name) #endif -#ifdef IS_IN_libutil +#if IS_IN (libutil) # define libutil_hidden_proto(name, attrs...) hidden_proto (name, ##attrs) # define libutil_hidden_tls_proto(name, attrs...) \ hidden_tls_proto (name, ##attrs) -- cgit v1.1