SRC=$(wildcard src/*.cpp)
INCLUDE =include

_HX_FEAT?= -DFIXED_ROW_SIZE=24

CXXFLAGS_COMMON = -Wall -pedantic --std=gnu++20 $(addprefix -I,$(INCLUDE)) -felide-constructors -fno-strict-aliasing -fno-exceptions
LDFLAGS_COMMON = -lfmt

CXXFLAGS_DEFAULT = -pipe -O3 -march=native -fgraphite -flto
CXXFLAGS_RELEASE =  -fomit-frame-pointer -fmerge-all-constants -fmodulo-sched -funswitch-loops -fsplit-loops
LDFLAGS_DEFAULT =  -O3 -flto

CXXFLAGS_DEBUG = -DDEBUG -O0 -g

PROJECT = hexview

OBJ = $(addprefix obj/,$(SRC:.cpp=.o))

### PGO target specific ###

# Number of times to run profiling
PGO_ITERATIONS = 512
# Size in kb of training files
PGO_DATASET_SIZE = $$(( 1024 * 4 ))

PGO_OBJ = $(addprefix profile/,$(SRC:.cpp=.o))
PROF_FLAGS = -fprofile-generate

###

.PHONY: release
release: | dirs $(PROJECT)-release

.PHONY: debug
debug: | dirs $(PROJECT)-debug

.PHONY: pgo
pgo: | dirs $(PROJECT)-pgo

dirs:
	@mkdir -p obj/src
	@mkdir -p profile/src

obj/%.o: %.cpp
	$(CXX) -c $< $(_HX_FEAT) $(CXXFLAGS) -o $@ $(LDFLAGS)

profile/%.o: %.cpp
	$(CXX) -c $< $(_HX_FEAT) $(CXXFLAGS) $(PROF_FLAGS) -o $@ $(LDFLAGS) $(PROF_FLAGS)

$(PROJECT)-release: CXXFLAGS?= $(CXXFLAGS_DEFAULT)
$(PROJECT)-release: LDFLAGS?=  $(LDFLAGS_DEFAULT)
$(PROJECT)-release: CXXFLAGS+= $(CXXFLAGS_COMMON)
$(PROJECT)-release: CXXFLAGS+= $(CXXFLAGS_RELEASE)
$(PROJECT)-release: LDFLAGS := $(LDFLAGS_COMMON) $(LDFLAGS)
$(PROJECT)-release: $(OBJ)
	$(CXX) $^ $(CXXFLAGS) -o $@ $(LDFLAGS)
	strip $@


$(PROJECT)-debug: CXXFLAGS += $(CXXFLAGS_COMMON) 
$(PROJECT)-debug: CXXFLAGS += $(CXXFLAGS_DEBUG)
$(PROJECT)-debug: LDFLAGS += $(LDFLAGS_COMMON)
$(PROJECT)-debug: $(OBJ)
	$(CXX) $^ $(CXXFLAGS) -o $@ $(LDFLAGS)

pgo-generate: $(PGO_OBJ)
	$(CXX) $^ $(CXXFLAGS) $(PROF_FLAGS) -o $@ $(LDFLAGS) $(PROF_FLAGS)

pgo-reset:
	find ./profile -name \*.gcda -exec rm {} +

pgo-profile: | pgo-reset pgo-generate
	for i in {1..$(PGO_ITERATIONS)}; do \
		dd if=/dev/urandom of=/tmp/$(PROJECT)-pgo-test bs=1024 count=$(PGO_DATASET_SIZE) >> /dev/null 2>&1; \
		printf "\rIteration $$i / $(PGO_ITERATIONS)"; \
		./pgo-generate /tmp/$(PROJECT)-pgo-test > /tmp/$(PROJECT)-pgo-output; \
	done
	@echo ""
	rm /tmp/$(PROJECT)-pgo-test
	rm /tmp/$(PROJECT)-pgo-output
	rm pgo-generate


pgo-use: CXXFLAGS?= $(CXXFLAGS_DEFAULT)
pgo-use: LDFLAGS?=  $(LDFLAGS_DEFAULT)
pgo-use: CXXFLAGS+= $(CXXFLAGS_COMMON)
pgo-use: CXXFLAGS+= $(CXXFLAGS_RELEASE)
pgo-use: LDFLAGS := $(LDFLAGS_COMMON) -lgcov $(LDFLAGS)
pgo-use: PROF_FLAGS = -fprofile-use
pgo-use: $(PGO_OBJ)
	$(CXX) $^ $(CXXFLAGS) $(PROF_FLAGS) -o $@ $(LDFLAGS) $(PROF_FLAGS)

$(PROJECT)-pgo: CXXFLAGS?= $(CXXFLAGS_DEFAULT)
$(PROJECT)-pgo: LDFLAGS?=  $(LDFLAGS_DEFAULT)
$(PROJECT)-pgo: CXXFLAGS+= $(CXXFLAGS_COMMON)
$(PROJECT)-pgo: CXXFLAGS+= $(CXXFLAGS_RELEASE)
$(PROJECT)-pgo: LDFLAGS := $(LDFLAGS_COMMON) $(LDFLAGS)
$(PROJECT)-pgo: | dirs pgo-profile
	find ./profile -name \*.o -exec rm {} +
	$(MAKE) pgo-use
	mv pgo-use $@
	strip $@

clean:
	rm -f $(PROJECT)-{release,debug,pgo}
	rm -rf obj
	rm -rf profile
	rm -f pgo-{test,output,generate}