On 31/10/24 03:42, Ian Rogers wrote:
> archinsn.c containing arch_fetch_insn was only enabled with
> CONFIG_AUXTRACE, but this meant that a NO_AUXTRACE build on x86 would
> use the empty weak version of arch_fetch_insn - weak symbols are a
> frequent source of errors like this and are outside of the C
> specification. Change it so that archinsn.c is always built on x86 and
> make the weak symbol empty version of arch_fetch_insn a strong one
> guarded by ifdefs.
>
> arch_fetch_insn on x86 depends on insn_decode which is a function
> included then built into
> intel-pt-insn-decoder.c. intel-pt-insn-decoder.c isn't built in a
> NO_AUXTRACE=1 build. Separate the insn_decode function from
> intel-pt-insn-decoder.c by just directly compiling the relevant
> file. Guard this compilation to be for either always on x86 (because
> of the use in arch_fetch_insn) or when auxtrace is enabled. Apply the
> CFLAGS overrides as necessary, reducing the amount of code where
> warnings are disabled.
>
> Signed-off-by: Ian Rogers <irogers@google.com>
For Intel PT
Tested-by: Adrian Hunter <adrian.hunter@intel.com>
> ---
> tools/perf/arch/x86/util/Build | 2 +-
> tools/perf/util/Build | 2 +-
> tools/perf/util/intel-pt-decoder/Build | 18 ++++++++++++++----
> .../intel-pt-decoder/intel-pt-insn-decoder.c | 3 ---
> tools/perf/util/trace-event-scripting.c | 4 +++-
> 5 files changed, 19 insertions(+), 10 deletions(-)
>
> diff --git a/tools/perf/arch/x86/util/Build b/tools/perf/arch/x86/util/Build
> index bc56a8e70f34..c5df4a2cf180 100644
> --- a/tools/perf/arch/x86/util/Build
> +++ b/tools/perf/arch/x86/util/Build
> @@ -18,6 +18,6 @@ perf-util-$(CONFIG_LOCAL_LIBUNWIND) += unwind-libunwind.o
> perf-util-$(CONFIG_LIBDW_DWARF_UNWIND) += unwind-libdw.o
>
> perf-util-$(CONFIG_AUXTRACE) += auxtrace.o
> -perf-util-$(CONFIG_AUXTRACE) += archinsn.o
> +perf-util-y += archinsn.o
> perf-util-$(CONFIG_AUXTRACE) += intel-pt.o
> perf-util-$(CONFIG_AUXTRACE) += intel-bts.o
> diff --git a/tools/perf/util/Build b/tools/perf/util/Build
> index 650974413849..340544a6f5ec 100644
> --- a/tools/perf/util/Build
> +++ b/tools/perf/util/Build
> @@ -122,7 +122,7 @@ perf-util-y += iostat.o
> perf-util-y += stream.o
> perf-util-y += kvm-stat.o
> perf-util-$(CONFIG_AUXTRACE) += auxtrace.o
> -perf-util-$(CONFIG_AUXTRACE) += intel-pt-decoder/
> +perf-util-y += intel-pt-decoder/
> perf-util-$(CONFIG_AUXTRACE) += intel-pt.o
> perf-util-$(CONFIG_AUXTRACE) += intel-bts.o
> perf-util-$(CONFIG_AUXTRACE) += arm-spe.o
> diff --git a/tools/perf/util/intel-pt-decoder/Build b/tools/perf/util/intel-pt-decoder/Build
> index 30793d08c6d4..f99d150059b9 100644
> --- a/tools/perf/util/intel-pt-decoder/Build
> +++ b/tools/perf/util/intel-pt-decoder/Build
> @@ -9,14 +9,24 @@ $(OUTPUT)util/intel-pt-decoder/inat-tables.c: $(inat_tables_script) $(inat_table
>
> # Busybox's diff doesn't have -I, avoid warning in the case
>
> -$(OUTPUT)util/intel-pt-decoder/intel-pt-insn-decoder.o: util/intel-pt-decoder/intel-pt-insn-decoder.c $(OUTPUT)util/intel-pt-decoder/inat-tables.c
> +ifeq ($(SRCARCH),x86)
> + perf-util-y += inat.o insn.o
> +else
> + perf-util-$(CONFIG_AUXTRACE) += inat.o insn.o
> +endif
> +
> +$(OUTPUT)util/intel-pt-decoder/inat.o: $(srctree)/tools/arch/x86/lib/inat.c $(OUTPUT)util/intel-pt-decoder/inat-tables.c
> $(call rule_mkdir)
> $(call if_changed_dep,cc_o_c)
>
> -CFLAGS_intel-pt-insn-decoder.o += -I$(OUTPUT)util/intel-pt-decoder
> +CFLAGS_inat.o += -I$(OUTPUT)util/intel-pt-decoder
> +
> +$(OUTPUT)util/intel-pt-decoder/insn.o: $(srctree)/tools/arch/x86/lib/insn.c
> + $(call rule_mkdir)
> + $(call if_changed_dep,cc_o_c)
>
> ifeq ($(CC_NO_CLANG), 1)
> - CFLAGS_intel-pt-insn-decoder.o += -Wno-override-init
> + CFLAGS_insn.o += -Wno-override-init
> endif
>
> -CFLAGS_intel-pt-insn-decoder.o += -Wno-packed
> +CFLAGS_insn.o += -Wno-packed
> diff --git a/tools/perf/util/intel-pt-decoder/intel-pt-insn-decoder.c b/tools/perf/util/intel-pt-decoder/intel-pt-insn-decoder.c
> index 47cf35799a4d..8fabddc1c0da 100644
> --- a/tools/perf/util/intel-pt-decoder/intel-pt-insn-decoder.c
> +++ b/tools/perf/util/intel-pt-decoder/intel-pt-insn-decoder.c
> @@ -11,9 +11,6 @@
> #include <byteswap.h>
> #include "../../../arch/x86/include/asm/insn.h"
>
> -#include "../../../arch/x86/lib/inat.c"
> -#include "../../../arch/x86/lib/insn.c"
> -
> #include "event.h"
>
> #include "intel-pt-insn-decoder.h"
> diff --git a/tools/perf/util/trace-event-scripting.c b/tools/perf/util/trace-event-scripting.c
> index 2e9da0b089ef..8d71998a9ecd 100644
> --- a/tools/perf/util/trace-event-scripting.c
> +++ b/tools/perf/util/trace-event-scripting.c
> @@ -272,11 +272,13 @@ void setup_perl_scripting(void)
> #endif
> #endif
>
> -__weak void arch_fetch_insn(struct perf_sample *sample __maybe_unused,
> +#if !defined(__i386__) && !defined(__x86_64__)
> +void arch_fetch_insn(struct perf_sample *sample __maybe_unused,
> struct thread *thread __maybe_unused,
> struct machine *machine __maybe_unused)
> {
> }
> +#endif
>
> void script_fetch_insn(struct perf_sample *sample, struct thread *thread,
> struct machine *machine, bool native_arch)