perf probe: Check if dwarf_getlocations() is available

If not, tell the user that:

  config/Makefile:273: Old libdw.h, finding variables at given 'perf probe' point will not work, install elfutils-devel/libdw-dev >= 0.157

And return -ENOTSUPP in die_get_var_range(), failing features that
need it, like the one pointed out above.

This fixes the build on older systems, such as Ubuntu 12.04.5.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Vinson Lee <vlee@freedesktop.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/n/tip-9l7luqkq4gfnx7vrklkq4obs@git.kernel.orgSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent d8e28654
...@@ -30,6 +30,7 @@ endef ...@@ -30,6 +30,7 @@ endef
FEATURE_TESTS_BASIC := \ FEATURE_TESTS_BASIC := \
backtrace \ backtrace \
dwarf \ dwarf \
dwarf_getlocations \
fortify-source \ fortify-source \
sync-compare-and-swap \ sync-compare-and-swap \
glibc \ glibc \
...@@ -78,6 +79,7 @@ endif ...@@ -78,6 +79,7 @@ endif
FEATURE_DISPLAY ?= \ FEATURE_DISPLAY ?= \
dwarf \ dwarf \
dwarf_getlocations \
glibc \ glibc \
gtk2 \ gtk2 \
libaudit \ libaudit \
......
...@@ -3,6 +3,7 @@ FILES= \ ...@@ -3,6 +3,7 @@ FILES= \
test-backtrace.bin \ test-backtrace.bin \
test-bionic.bin \ test-bionic.bin \
test-dwarf.bin \ test-dwarf.bin \
test-dwarf_getlocations.bin \
test-fortify-source.bin \ test-fortify-source.bin \
test-sync-compare-and-swap.bin \ test-sync-compare-and-swap.bin \
test-glibc.bin \ test-glibc.bin \
...@@ -82,6 +83,9 @@ endif ...@@ -82,6 +83,9 @@ endif
$(OUTPUT)test-dwarf.bin: $(OUTPUT)test-dwarf.bin:
$(BUILD) $(DWARFLIBS) $(BUILD) $(DWARFLIBS)
$(OUTPUT)test-dwarf_getlocations.bin:
$(BUILD) $(DWARFLIBS)
$(OUTPUT)test-libelf-mmap.bin: $(OUTPUT)test-libelf-mmap.bin:
$(BUILD) -lelf $(BUILD) -lelf
......
...@@ -41,6 +41,10 @@ ...@@ -41,6 +41,10 @@
# include "test-dwarf.c" # include "test-dwarf.c"
#undef main #undef main
#define main main_test_dwarf_getlocations
# include "test-dwarf_getlocations.c"
#undef main
#define main main_test_libelf_getphdrnum #define main main_test_libelf_getphdrnum
# include "test-libelf-getphdrnum.c" # include "test-libelf-getphdrnum.c"
#undef main #undef main
...@@ -143,6 +147,7 @@ int main(int argc, char *argv[]) ...@@ -143,6 +147,7 @@ int main(int argc, char *argv[])
main_test_libelf_mmap(); main_test_libelf_mmap();
main_test_glibc(); main_test_glibc();
main_test_dwarf(); main_test_dwarf();
main_test_dwarf_getlocations();
main_test_libelf_getphdrnum(); main_test_libelf_getphdrnum();
main_test_libunwind(); main_test_libunwind();
main_test_libaudit(); main_test_libaudit();
......
#include <stdlib.h>
#include <elfutils/libdw.h>
int main(void)
{
Dwarf_Addr base, start, end;
Dwarf_Attribute attr;
Dwarf_Op *op;
size_t nops;
ptrdiff_t offset = 0;
return (int)dwarf_getlocations(&attr, offset, &base, &start, &end, &op, &nops);
}
...@@ -268,6 +268,12 @@ else ...@@ -268,6 +268,12 @@ else
ifneq ($(feature-dwarf), 1) ifneq ($(feature-dwarf), 1)
msg := $(warning No libdw.h found or old libdw.h found or elfutils is older than 0.138, disables dwarf support. Please install new elfutils-devel/libdw-dev); msg := $(warning No libdw.h found or old libdw.h found or elfutils is older than 0.138, disables dwarf support. Please install new elfutils-devel/libdw-dev);
NO_DWARF := 1 NO_DWARF := 1
else
ifneq ($(feature-dwarf_getlocations), 1)
msg := $(warning Old libdw.h, finding variables at given 'perf probe' point will not work, install elfutils-devel/libdw-dev >= 0.157);
else
CFLAGS += -DHAVE_DWARF_GETLOCATIONS
endif # dwarf_getlocations
endif # Dwarf support endif # Dwarf support
endif # libelf support endif # libelf support
endif # NO_LIBELF endif # NO_LIBELF
......
...@@ -959,6 +959,7 @@ int die_get_varname(Dwarf_Die *vr_die, struct strbuf *buf) ...@@ -959,6 +959,7 @@ int die_get_varname(Dwarf_Die *vr_die, struct strbuf *buf)
return 0; return 0;
} }
#ifdef HAVE_DWARF_GETLOCATIONS
/** /**
* die_get_var_innermost_scope - Get innermost scope range of given variable DIE * die_get_var_innermost_scope - Get innermost scope range of given variable DIE
* @sp_die: a subprogram DIE * @sp_die: a subprogram DIE
...@@ -1080,3 +1081,11 @@ int die_get_var_range(Dwarf_Die *sp_die, Dwarf_Die *vr_die, struct strbuf *buf) ...@@ -1080,3 +1081,11 @@ int die_get_var_range(Dwarf_Die *sp_die, Dwarf_Die *vr_die, struct strbuf *buf)
return ret; return ret;
} }
#else
int die_get_var_range(Dwarf_Die *sp_die __maybe_unused,
Dwarf_Die *vr_die __maybe_unused,
struct strbuf *buf __maybe_unused)
{
return -ENOTSUP;
}
#endif
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