1 files changed, 55 insertions, 0 deletions
diff --git a/coverage.mk b/coverage.mk
new file mode 100644
index 0000000..aed4864
--- /dev/null
+++ b/coverage.mk
@@ -0,0 +1,55 @@
+# Measure code coverage using luacov and gcov
+# C and Lua code is measured separately and resutls are combined together
+# Define COVERAGE=1 during build *and* test runs to enable measurement.
+#
+# Beware: Tests are typically run in parallel and neither luacov not gcov
+# support that, so we have to store results from each run separatelly
+# and combine them.
+
+coverage-c-combine-gcda:
+	@# combine trees of gcda files into one info file per tree
+	@mkdir -p '$(COVERAGE_STATSDIR)/tmp.c'
+	@LCOV=$(LCOV) ./scripts/coverage_c_combine.sh '$(TOPSRCDIR)' '$(COVERAGE_STATSDIR)' '$(COVERAGE_STATSDIR)/tmp.c'
+
+coverage-c: coverage-c-combine-gcda
+	@# combine info files for each tree into resulting c.info file
+	@$(LCOV) -q $(addprefix --add-tracefile ,$(wildcard $(COVERAGE_STATSDIR)/tmp.c/*.info)) --output-file '$(COVERAGE_STAGE).c.info'
+	@$(RM) -r '$(COVERAGE_STATSDIR)/tmp.c'
+
+LUA_STATS_OUT := $(shell find '$(COVERAGE_STATSDIR)' -type f -name 'luacov.stats.out' 2> /dev/null)
+LUA_INFOS_OUT := $(patsubst %.stats.out,%.lua.info,$(LUA_STATS_OUT))
+
+coverage-lua-fix-paths: $(LUA_STATS_OUT)
+	@# map Lua install paths to source paths
+	@$(MAKE) PREFIX=$(PREFIX) install --dry-run --always-make | scripts/map_install_src.lua --sed > .luacov_path_map
+	@sed -i -f .luacov_path_map $^
+	@$(RM) .luacov_path_map
+
+luacov.empty_stats.out:
+	@# generate list of all Lua files to fill holes in luacov stats
+	@$(MAKE) PREFIX=$(PREFIX) install --dry-run --always-make | scripts/map_install_src.lua | cut -f 2 | grep '\.lua$$' | scripts/luacov_gen_empty.sh > luacov.empty_stats.out
+
+%.lua.info: %.stats.out coverage-lua-fix-paths
+	@scripts/luacov_to_info.lua $*.stats.out > $@
+
+coverage-lua: $(LUA_INFOS_OUT) luacov.empty_stats.out
+	@echo '# Lua coverage in $(COVERAGE_STAGE).lua.info'
+	@# add missing files to luacov stats
+	@scripts/luacov_to_info.lua luacov.empty_stats.out > luacov.empty_stats.lua.info
+	@# combine info files for each tree into resulting lua.info file
+	@$(LCOV) -q $(addprefix --add-tracefile ,$(LUA_INFOS_OUT)) --add-tracefile luacov.empty_stats.lua.info --output-file '$(COVERAGE_STAGE).lua.info'
+	@$(RM) luacov.empty_stats.out luacov.empty_stats.lua.info
+
+coverage:
+	@$(LCOV) $(addprefix --add-tracefile ,$(wildcard $(COVERAGE_STAGE)*.info)) --output-file coverage.info
+	@$(GENHTML) --no-function-coverage --no-branch-coverage -q -o coverage -p '$(realpath $(CURDIR))' -t 'Knot Resolver $(VERSION)-$(PLATFORM) coverage report' --legend coverage.info
+
+coverage-clean:
+	@$(RM) -rf '$(COVERAGE_STATSDIR)'
+
+.PHONY: coverage-c-combine-gcda coverage-c coverage-lua-fix-paths coverage-lua coverage coverage-clean
+
+# Options
+ifdef COVERAGE
+BUILD_CFLAGS += --coverage
+endif