######################################################################
#
# DESCRIPTION: Verilator Example: Small Makefile
#
# This calls the object directory makefile.  That allows the objects to
# be placed in the "current directory" which simplifies the Makefile.
#
# This file ONLY is placed under the Creative Commons Public Domain, for
# any use, without warranty, 2020 by Wilson Snyder.
# SPDX-License-Identifier: CC0-1.0
#
######################################################################
# Check for sanity to avoid later confusion

ifneq ($(words $(CURDIR)),1)
 $(error Unsupported: GNU Make cannot build in directories containing spaces, build elsewhere: '$(CURDIR)')
endif

######################################################################
# Set up variables

# If $VERILATOR_ROOT isn't in the environment, we assume it is part of a
# package install, and verilator is in your path. Otherwise find the
# binary relative to $VERILATOR_ROOT (such as when inside the git sources).
ifeq ($(VERILATOR_ROOT),)
VERILATOR = verilator
VERILATOR_COVERAGE = verilator_coverage
else
export VERILATOR_ROOT
VERILATOR = $(VERILATOR_ROOT)/bin/verilator
VERILATOR_COVERAGE = $(VERILATOR_ROOT)/bin/verilator_coverage
endif

VERILATOR_FLAGS =
# Generate SystemC in executable form
VERILATOR_FLAGS += -sc --exe
# Generate makefile dependencies (not shown as complicates the Makefile)
#VERILATOR_FLAGS += -MMD
# Optimize
VERILATOR_FLAGS += -x-assign fast
# Warn abount lint issues; may not want this on less solid designs
VERILATOR_FLAGS += -Wall
# Make waveforms
VERILATOR_FLAGS += --trace
# Check SystemVerilog assertions
VERILATOR_FLAGS += --assert
# Enable multithreading
VERILATOR_FLAGS += --threads 14
# Generate coverage analysis
# VERILATOR_FLAGS += --coverage
# Run Verilator in debug mode
#VERILATOR_FLAGS += --debug
# Add this trace to get a backtrace in gdb
#VERILATOR_FLAGS += --gdbbt
# Ignore Some Warnings
VERILATOR_FLAGS += -Wno-WIDTHEXPAND -Wno-UNUSEDSIGNAL -Wno-UNUSEDPARAM

# Specify top module
TOP_MODULE = isp
VERILATOR_FLAGS += --top-module $(TOP_MODULE)
# Input files for Verilator
# Verilog/SystemVerilog files
SOURCES := $(wildcard ./rtl/isp.sv ./rtl/Windows.sv ./rtl/Demosaic/*.sv ./rtl/Crop/*.sv ./rtl/Color/*.sv)
# C/C++ files
SOURCES += $(wildcard ./src/*.cpp ./src/transform/*.cpp)
# Exclude files
EXCLUDES := $(wildcard )
VERILATOR_INPUT := $(filter-out $(EXCLUDES), $(SOURCES))
# Check if SC exists via a verilator call (empty if not)
SYSTEMC_EXISTS := $(shell $(VERILATOR) --get-supported SYSTEMC)

######################################################################

ifneq ($(SYSTEMC_EXISTS),)
default: build run
else
default: nosc
endif

lint:
	@echo "-- Verilator lint check ----"
	$(VERILATOR) -sc --lint-only $(VERILATOR_INPUT)

build:
	@echo
	@echo "-- VERILATE ----------------"
	$(VERILATOR) $(VERILATOR_FLAGS) $(VERILATOR_INPUT)

	@echo
	@echo "-- COMPILE -----------------"
# To compile, we can either
# 1. Pass --build to Verilator by editing VERILATOR_FLAGS above.
# 2. Or, run the make rules Verilator does:
#	$(MAKE) -j -C obj_dir -f Vtop.mk
# 3. Or, call a submakefile where we can override the rules ourselves:
	$(MAKE) -j -C obj_dir -f V$(TOP_MODULE).mk

run:
	@echo
	@echo "-- RUN ---------------------"
	obj_dir/V$(TOP_MODULE)

# @echo
# @echo "-- COVERAGE ----------------"
# @rm -rf logs/annotated
# $(VERILATOR_COVERAGE) --annotate logs/annotated logs/coverage.dat
	@echo "-- FINISH ------------------"

trace:
	@rm -rf logs
	@mkdir -p logs
	obj_dir/V$(TOP_MODULE) +trace

	@echo
	@echo "-- DONE --------------------"
	@echo "To see waveforms, open vlt_dump.vcd in a waveform viewer"
	@echo


######################################################################
# Other targets

nosc:
	@echo
	@echo "%Skip: SYSTEMC_INCLUDE not in environment"
	@echo "(If you have SystemC see the README, and rebuild Verilator)"
	@echo

show-config:
	$(VERILATOR) -V

maintainer-copy::
clean mostlyclean distclean maintainer-clean::
	-rm -rf obj_dir logs *.log *.dmp *.vpd coverage.dat core