# -*- Makefile -*-
# This Makefile template is supposed to be included in each plugin's Makefile.
# Plugin Makefiles need to specify the plugin's name and source files.
# The plugin name is how the final shared object will be named.
# This shared object can be imported to Yosys with `plugin -i` command.
#
# Below is an example of a plugin Makefile that uses this template:
# PLUGIN_DIR := $(abspath $(dir $(lastword $(MAKEFILE_LIST))))
# NAME = plugin_name
# SOURCES = source1.cc source2.cc
# include ../Makefile_plugin.common
#
# For the above example the final plugin shared object will be named plugin_name.so.
# In order to test the plugin it has to be copied to Yosys's shared folder.
# The install target in this Makefile copies the plugins into the shared folder
# of the Yosys installation that is found in the PATH.
# This is needed because the shared folder is where Yosys will look for the
# plugin object when `plugin -i` is called in Yosys's synthesis script.
#
# To add tests for the plugin the Makefile_test.common Makefile should be used.
# Refer to Makefile_test.common to learn more details.
#
# Below is a directory structure which shows how the plugin sources and tests
# should be laid out
#
# |-- Makefile_plugin.common
# |-- Makefile_test.common
# |-- example-plugin
# |   |-- Makefile
# |   |-- source1.cc
# |   |-- source2.cc
# |   |-- tests
# |       |-- Makefile
# |       |-- test_case_1
# |       |   |-- test_case_1.tcl
# |       |   |-- test_case_1.v
# |       |   |-- test_case_1.golden.ext
# |       |   |-- ...
# |-- example2-plugin
# |-- ...

SHELL := /usr/bin/env bash

# Directory containing this Makefile
TOP_DIR := $(abspath $(dir $(lastword $(MAKEFILE_LIST))))

_MAKEFILES := $(abspath $(filter-out %.d,$(MAKEFILE_LIST)))

# Either find yosys in system and use its path or use the given path
YOSYS_PATH ?= $(realpath $(dir $(shell command -v yosys))/..)

# Find yosys-config, throw an error if not found
YOSYS_CONFIG = $(YOSYS_PATH)/bin/yosys-config
ifeq (,$(wildcard $(YOSYS_CONFIG)))
  $(error "Didn't find 'yosys-config' under '$(YOSYS_PATH)'")
endif

CXX ?= $(shell $(YOSYS_CONFIG) --cxx)
CXXFLAGS := $(shell $(YOSYS_CONFIG) --cxxflags) $(CXXFLAGS) #-DSDC_DEBUG
LDFLAGS := $(shell $(YOSYS_CONFIG) --ldflags) $(LDFLAGS)
LDLIBS := $(shell $(YOSYS_CONFIG) --ldlibs) $(LDLIBS)
EXTRA_FLAGS ?=

YOSYS_DATA_DIR = $(DESTDIR)$(shell $(YOSYS_CONFIG) --datdir)
YOSYS_PLUGINS_DIR = $(YOSYS_DATA_DIR)/plugins

BUILD_DIR := $(PLUGIN_DIR)/build

# Filled below with all object file paths
_ALL_OBJECTS :=
# Filled below with all build directory paths
_ALL_BUILD_SUBDIRS :=

# Default rule

.PHONY: all
all: $(NAME).so

# Object files

define _process-single-source-file
_source_abs := $(abspath $(addprefix $(PLUGIN_DIR)/,$(source)))
_object_abs := $(abspath $(addprefix $(BUILD_DIR)/,$(source).o))
_object_dir := $(abspath $(dir $(_object_abs)))
_ALL_OBJECTS += $(_object_abs)
_ALL_BUILD_SUBDIRS += $(_object_dir)

-include $(abspath $(addprefix $(BUILD_DIR)/,$(source).d))

$(_object_abs): TARGET_SOURCES := $(_source_abs)
$(_object_abs): $(_source_abs) | $(_object_dir)
endef
$(foreach source,$(SOURCES),$(eval $(value _process-single-source-file)))

$(_ALL_OBJECTS): $(_MAKEFILES)
	$(CXX) $(CXXFLAGS) $(CPPFLAGS) $(EXTRA_FLAGS) -MMD -c -o $@ $(TARGET_SOURCES)

# Objects list for the purpose of adding extra dependencies after inclusion.
# Example use: `$(OBJECTS): $(BUILD_DIR)/some-file.h`
OBJECTS := $(_ALL_OBJECTS)

# Shared library

_SO_LIB := $(BUILD_DIR)/$(NAME).so
_ALL_BUILD_SUBDIRS += $(abspath $(dir $(_SO_LIB)))

$(_SO_LIB): $(_ALL_OBJECTS) $(_MAKEFILES) | $(abspath $(dir $(_SO_LIB)))
	$(CXX) $(CXXFLAGS) $(LDFLAGS) -shared -o $@ $(_ALL_OBJECTS) $(LDLIBS)

.PHONY: $(NAME).so
$(NAME).so: $(_SO_LIB)

# Tests

.PHONY: test test_clean
ifneq ($(wildcard $(PLUGIN_DIR)/tests/Makefile),)
test:
	@$(MAKE) -C tests all
test_clean:
	$(MAKE) -C tests clean
else
test:
test_clean:
endif

# Installation

$(YOSYS_PLUGINS_DIR)/$(NAME).so: $(_SO_LIB) | $(YOSYS_PLUGINS_DIR)
	install -D $(_SO_LIB) $@

.PHONY: install_plugin
install_plugin: $(YOSYS_PLUGINS_DIR)/$(NAME).so

.PHONY: install
install: install_plugin

# Cleanup

clean: test_clean
	rm -rf $(BUILD_DIR)

# Other

$(sort $(_ALL_BUILD_SUBDIRS)):
	mkdir -p $@

$(YOSYS_PLUGINS_DIR):
	@mkdir -p $@

PMGEN_PY := $(TOP_DIR)/pmgen.py

$(PMGEN_PY):
	@$(MAKE) -C $(TOP_DIR) pmgen.py