Re: [Qemu-devel] [PATCH] trace: fix tcg tracing build breakage

["Daniel P. Berrange" <berrange@redhat.com>]

On Mon, Mar 27, 2017 at 02:17:18PM +0100, Stefan Hajnoczi wrote:
> Commit 0ab8ed18a6fe98bfc82705b0f041fbf2a8ca5b60 ("trace: switch to
> modular code generation for sub-directories") forgot to convert "tcg"
> trace events to the modular code generation approach where each
> sub-directory has its own trace-events file.
> 
> This patch fixes compilation for "tcg" trace events.  Currently they are
> only used in the root ./trace-events file.
> 
> "tcg" trace events can only be used in the root ./trace-events file for
> the time being.
> 
> Reported-by: Peter Maydell <peter.maydell@linaro.org>
> Suggested-by: Emilio G. Cota <cota@braap.org>
> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
> ---
>  docs/tracing.txt                         |  3 +++
>  trace/Makefile.objs                      | 16 ++++++++--------
>  scripts/tracetool/format/tcg_h.py        |  1 +
>  scripts/tracetool/format/tcg_helper_c.py |  1 +
>  4 files changed, 13 insertions(+), 8 deletions(-)

Reviewed-by: Daniel P. Berrange <berrange@redhat.com>

> diff --git a/docs/tracing.txt b/docs/tracing.txt
> index e14bb6d..8c0029b 100644
> --- a/docs/tracing.txt
> +++ b/docs/tracing.txt
> @@ -405,6 +405,9 @@ information. If used together with the "tcg" property, it adds a second
>  "TCGv_env" argument that must point to the per-target global TCG register that
>  points to the vCPU when guest code is executed (usually the "cpu_env" variable).
>  
> +The "tcg" and "vcpu" properties are currently only honored in the root
> +./trace-events file.
> +
>  The following example events:
>  
>      foo(uint32_t a) "a=%x"
> diff --git a/trace/Makefile.objs b/trace/Makefile.objs
> index 1b8eb4a..afd571c 100644
> --- a/trace/Makefile.objs
> +++ b/trace/Makefile.objs
> @@ -9,27 +9,27 @@ $(BUILD_DIR)/trace-events-all: $(trace-events-files)
>  
>  $(obj)/generated-helpers-wrappers.h: $(obj)/generated-helpers-wrappers.h-timestamp
>  	@cmp $< $@ >/dev/null 2>&1 || cp $< $@
> -$(obj)/generated-helpers-wrappers.h-timestamp: $(trace-events-files) $(BUILD_DIR)/config-host.mak $(tracetool-y)
> +$(obj)/generated-helpers-wrappers.h-timestamp: $(SRC_PATH)/trace-events $(BUILD_DIR)/config-host.mak $(tracetool-y)
>  	$(call quiet-command,$(TRACETOOL) \
> -		--group=all \
> +		--group=root \
>  		--format=tcg-helper-wrapper-h \
>  		--backend=$(TRACE_BACKENDS) \
>  		$< > $@,"GEN","$(patsubst %-timestamp,%,$@)")
>  
>  $(obj)/generated-helpers.h: $(obj)/generated-helpers.h-timestamp
>  	@cmp $< $@ >/dev/null 2>&1 || cp $< $@
> -$(obj)/generated-helpers.h-timestamp: $(trace-events-files) $(BUILD_DIR)/config-host.mak $(tracetool-y)
> +$(obj)/generated-helpers.h-timestamp: $(SRC_PATH)/trace-events $(BUILD_DIR)/config-host.mak $(tracetool-y)
>  	$(call quiet-command,$(TRACETOOL) \
> -		--group=all \
> +		--group=root \
>  		--format=tcg-helper-h \
>  		--backend=$(TRACE_BACKENDS) \
>  		$< > $@,"GEN","$(patsubst %-timestamp,%,$@)")
>  
>  $(obj)/generated-helpers.c: $(obj)/generated-helpers.c-timestamp
>  	@cmp $< $@ >/dev/null 2>&1 || cp $< $@
> -$(obj)/generated-helpers.c-timestamp: $(trace-events-files) $(BUILD_DIR)/config-host.mak $(tracetool-y)
> +$(obj)/generated-helpers.c-timestamp: $(SRC_PATH)/trace-events $(BUILD_DIR)/config-host.mak $(tracetool-y)
>  	$(call quiet-command,$(TRACETOOL) \
> -		--group=all \
> +		--group=root \
>  		--format=tcg-helper-c \
>  		--backend=$(TRACE_BACKENDS) \
>  		$< > $@,"GEN","$(patsubst %-timestamp,%,$@)")
> @@ -41,9 +41,9 @@ target-obj-y += generated-helpers.o
>  
>  $(obj)/generated-tcg-tracers.h: $(obj)/generated-tcg-tracers.h-timestamp
>  	@cmp $< $@ >/dev/null 2>&1 || cp $< $@
> -$(obj)/generated-tcg-tracers.h-timestamp: $(trace-events-files) $(BUILD_DIR)/config-host.mak $(tracetool-y)
> +$(obj)/generated-tcg-tracers.h-timestamp: $(SRC_PATH)/trace-events $(BUILD_DIR)/config-host.mak $(tracetool-y)
>  	$(call quiet-command,$(TRACETOOL) \
> -		--group=all \
> +		--group=root \
>  		--format=tcg-h \
>  		--backend=$(TRACE_BACKENDS) \
>  		$< > $@,"GEN","$(patsubst %-timestamp,%,$@)")
> diff --git a/scripts/tracetool/format/tcg_h.py b/scripts/tracetool/format/tcg_h.py
> index 7ddc4a5..db55f52 100644
> --- a/scripts/tracetool/format/tcg_h.py
> +++ b/scripts/tracetool/format/tcg_h.py
> @@ -40,6 +40,7 @@ def generate(events, backend, group):
>          '#define TRACE_%s_GENERATED_TCG_TRACERS_H' % group.upper(),
>          '',
>          '#include "exec/helper-proto.h"',
> +        '#include "%s"' % header,
>          '',
>          )
>  
> diff --git a/scripts/tracetool/format/tcg_helper_c.py b/scripts/tracetool/format/tcg_helper_c.py
> index 7dccd8c..ec7acbe 100644
> --- a/scripts/tracetool/format/tcg_helper_c.py
> +++ b/scripts/tracetool/format/tcg_helper_c.py
> @@ -55,6 +55,7 @@ def generate(events, backend, group):
>          '#include "qemu-common.h"',
>          '#include "cpu.h"',
>          '#include "exec/helper-proto.h"',
> +        '#include "%s"' % header,
>          '',
>          )
>  
> -- 
> 2.9.3
> 

Regards,
Daniel
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