[Xen-devel] [PATCH v3 4/7] kconfig/gcov: rename to coverage

[Roger Pau Monne <roger.pau@xxxxxxxxxx>]

So it can be used by both gcc and clang. Just add the Kconfig option
and modify the makefiles so the llvm coverage specific code can be
added in a follow up patch.

Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
---
Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Cc: George Dunlap <George.Dunlap@xxxxxxxxxxxxx>
Cc: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
Cc: Jan Beulich <jbeulich@xxxxxxxx>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>
Cc: Tim Deegan <tim@xxxxxxx>
Cc: Wei Liu <wei.liu2@xxxxxxxxxx>
---
Changes since v2:
 - select SUPPRESS_DUPLICATE_SYMBOL_WARNINGS when enabling coverage
   support in Kconfig.
 - Introduce COV_FLAGS to store the compiler flags to enable coverage
   support for clang and gcc.
 - Return -EOPNOTSUPP in sysctl_cov_op if not implemented.

Changes since v1:
 - Use a choice in kconfig to select code coverage technology.
 - Compile coverage.c regardless of selected code coverage technology.
 - Introduce an unimplemented sysctl_cov_op function if
   CONFIG_COVERAGE is not set.
---
 docs/misc/coverage.markdown  | 2 +-
 xen/Kconfig.debug            | 6 +++---
 xen/Rules.mk                 | 9 +++++++--
 xen/common/Makefile          | 2 +-
 xen/common/coverage/Makefile | 5 ++++-
 xen/common/sysctl.c          | 2 --
 xen/include/xen/coverage.h   | 7 ++++++-
 7 files changed, 22 insertions(+), 11 deletions(-)

diff --git a/docs/misc/coverage.markdown b/docs/misc/coverage.markdown
index b47aba2648..430cd27b2f 100644
--- a/docs/misc/coverage.markdown
+++ b/docs/misc/coverage.markdown
@@ -10,7 +10,7 @@ down your hypervisor.
 
 ## Enable coverage
 
-Test coverage support can be turned on compiling Xen with the `CONFIG_GCOV`
+Test coverage support can be turned on compiling Xen with the `CONFIG_COVERAGE`
 option set to `y`.
 
 Change your `.config` or run `make -C xen menuconfig`.
diff --git a/xen/Kconfig.debug b/xen/Kconfig.debug
index 7bb0465b5d..380c4e8d75 100644
--- a/xen/Kconfig.debug
+++ b/xen/Kconfig.debug
@@ -28,12 +28,12 @@ config FRAME_POINTER
          maybe slower, but it gives very useful debugging information
          in case of any Xen bugs.
 
-config GCOV
-       bool "Gcov Support"
+config COVERAGE
+       bool "Code coverage support"
        depends on !LIVEPATCH
        select SUPPRESS_DUPLICATE_SYMBOL_WARNINGS
        ---help---
-         Enable gcov (a test coverage program in GCC) support.
+         Enable code coverage support.
 
          If unsure, say N here.
 
diff --git a/xen/Rules.mk b/xen/Rules.mk
index 3cf40754a6..0bc40fd0e6 100644
--- a/xen/Rules.mk
+++ b/xen/Rules.mk
@@ -115,8 +115,13 @@ subdir-all := $(subdir-y) $(subdir-n)
 
 $(filter %.init.o,$(obj-y) $(obj-bin-y) $(extra-y)): CFLAGS += 
-DINIT_SECTIONS_ONLY
 
-ifeq ($(CONFIG_GCOV),y)
-$(filter-out %.init.o $(nogcov-y),$(obj-y) $(obj-bin-y) $(extra-y)): CFLAGS += 
-fprofile-arcs -ftest-coverage
+ifeq ($(CONFIG_COVERAGE),y)
+ifeq ($(clang),y)
+    COV_FLAGS := -fprofile-instr-generate -fcoverage-mapping
+else
+    COV_FLAGS := -fprofile-arcs -ftest-coverage
+endif
+    $(filter-out %.init.o $(nogcov-y),$(obj-y) $(obj-bin-y) $(extra-y)): 
CFLAGS += $(COV_FLAGS)
 endif
 
 ifeq ($(CONFIG_UBSAN),y)
diff --git a/xen/common/Makefile b/xen/common/Makefile
index ad181636f6..3a349f478b 100644
--- a/xen/common/Makefile
+++ b/xen/common/Makefile
@@ -74,7 +74,7 @@ tmem-y := tmem.o tmem_xen.o tmem_control.o
 tmem-$(CONFIG_COMPAT) += compat/tmem_xen.o
 obj-$(CONFIG_TMEM) += $(tmem-y)
 
-subdir-$(CONFIG_GCOV) += coverage
+subdir-$(CONFIG_COVERAGE) += coverage
 subdir-$(CONFIG_UBSAN) += ubsan
 
 subdir-y += libelf
diff --git a/xen/common/coverage/Makefile b/xen/common/coverage/Makefile
index 5387bc6429..1039a160c4 100644
--- a/xen/common/coverage/Makefile
+++ b/xen/common/coverage/Makefile
@@ -1,6 +1,9 @@
-obj-y += coverage.o gcov_base.o gcov.o
+obj-y += coverage.o
+ifneq ($(clang),y)
+obj-y += gcov_base.o gcov.o
 obj-y += $(call cc-ifversion,lt,0x040700, \
                gcc_3_4.o, $(call cc-ifversion,lt,0x040900, \
                gcc_4_7.o, $(call cc-ifversion,lt,0x050000, \
                gcc_4_9.o, $(call cc-ifversion,lt,0x070000, \
                gcc_5.o, gcc_7.o))))
+endif
diff --git a/xen/common/sysctl.c b/xen/common/sysctl.c
index f2ae6295ff..8e83c33a16 100644
--- a/xen/common/sysctl.c
+++ b/xen/common/sysctl.c
@@ -396,12 +396,10 @@ long do_sysctl(XEN_GUEST_HANDLE_PARAM(xen_sysctl_t) 
u_sysctl)
     }
     break;
 
-#ifdef CONFIG_GCOV
     case XEN_SYSCTL_coverage_op:
         ret = sysctl_cov_op(&op->u.coverage_op);
         copyback = 1;
         break;
-#endif
 
 #ifdef CONFIG_HAS_PCI
     case XEN_SYSCTL_pcitopoinfo:
diff --git a/xen/include/xen/coverage.h b/xen/include/xen/coverage.h
index daddef37d3..ba5fb67947 100644
--- a/xen/include/xen/coverage.h
+++ b/xen/include/xen/coverage.h
@@ -1,9 +1,14 @@
 #ifndef _XEN_COV_H
 #define _XEN_COV_H
 
-#ifdef CONFIG_GCOV
+#ifdef CONFIG_COVERAGE
 #include <public/sysctl.h>
 int sysctl_cov_op(struct xen_sysctl_coverage_op *op);
+#else
+static inline int sysctl_cov_op(void *unused)
+{
+    return -EOPNOTSUPP;
+}
 #endif
 
 #endif /* _XEN_GCOV_H */
-- 
2.15.1


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