#***************************************************************************************
# Copyright (c) 2020-2021 Institute of Computing Technology, Chinese Academy of Sciences
#
# XiangShan is licensed under Mulan PSL v2.
# You can use this software according to the terms and conditions of the Mulan PSL v2.
# You may obtain a copy of Mulan PSL v2 at:
#          http://license.coscl.org.cn/MulanPSL2
#
# THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
# EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
# MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
#
# See the Mulan PSL v2 for more details.
#***************************************************************************************

EMU_TOP      = SimTop

EMU_CSRC_DIR = $(abspath ./src/test/csrc/verilator)
EMU_CXXFILES = $(shell find $(EMU_CSRC_DIR) -name "*.cpp") $(SIM_CXXFILES) $(DIFFTEST_CXXFILES)
EMU_CXXFLAGS += -std=c++11 -static -Wall -I$(EMU_CSRC_DIR) -I$(SIM_CSRC_DIR) -I$(DIFFTEST_CSRC_DIR)
EMU_CXXFLAGS += -DVERILATOR -Wno-maybe-uninitialized
EMU_LDFLAGS  += -lpthread -lSDL2 -ldl -lz

EMU_VFILES    = $(SIM_VSRC)

CCACHE := $(if $(shell which ccache),ccache,)
ifneq ($(CCACHE),)
export OBJCACHE = ccache
endif

VEXTRA_FLAGS  = -I$(abspath $(BUILD_DIR)) --x-assign unique -O3 -CFLAGS "$(EMU_CXXFLAGS)" -LDFLAGS "$(EMU_LDFLAGS)"

# Verilator trace support
EMU_TRACE ?=
ifeq ($(EMU_TRACE),1)
VEXTRA_FLAGS += --trace
endif

# Verilator multi-thread support
EMU_THREADS  ?= 0
ifneq ($(EMU_THREADS),0)
VEXTRA_FLAGS += --threads $(EMU_THREADS) --threads-dpi all
endif

# Verilator savable
EMU_SNAPSHOT ?=
ifeq ($(EMU_SNAPSHOT),1)
VEXTRA_FLAGS += --savable
EMU_CXXFLAGS += -DVM_SAVABLE

# Fork-wait 
EMU_FORKWAIT ?= 
ifeq ($(EMU_FORKWAIT),1)
EMU_CXXFLAGS += -DEN_FORKWAIT
endif

# Verilator coverage
EMU_COVERAGE ?=
ifeq ($(EMU_COVERAGE),1)
VEXTRA_FLAGS += --coverage-line --coverage-toggle
endif

# co-simulation with DRAMsim3
ifeq ($(WITH_DRAMSIM3),1)
EMU_CXXFLAGS += -I$(DRAMSIM3_HOME)/src
EMU_CXXFLAGS += -DWITH_DRAMSIM3 -DDRAMSIM3_CONFIG=\\\"$(DRAMSIM3_HOME)/configs/XiangShan.ini\\\" -DDRAMSIM3_OUTDIR=\\\"$(BUILD_DIR)\\\"
EMU_LDFLAGS  += $(DRAMSIM3_HOME)/build/libdramsim3.a
endif

ifeq ($(DUALCORE),1)
EMU_CXXFLAGS += -DDUALCORE
endif

USE_BIN ?= 0
ifeq ($(USE_BIN),1)
EMU_CXXFLAGS += -DUSE_BIN
endif

# --trace
VERILATOR_FLAGS =                   \
  --top-module $(EMU_TOP)           \
  +define+VERILATOR=1               \
  +define+PRINTF_COND=1             \
  +define+RANDOMIZE_REG_INIT        \
  +define+RANDOMIZE_MEM_INIT        \
  +define+RANDOMIZE_GARBAGE_ASSIGN  \
  +define+RANDOMIZE_DELAY=0         \
  -Wno-STMTDLY -Wno-WIDTH           \
  $(VEXTRA_FLAGS)                   \
  --assert                          \
  --stats-vars                      \
  --output-split 30000              \
  --output-split-cfuncs 30000

EMU_MK := $(BUILD_DIR)/emu-compile/V$(EMU_TOP).mk
EMU_DEPS := $(EMU_VFILES) $(EMU_CXXFILES)
EMU_HEADERS := $(shell find $(EMU_CSRC_DIR) -name "*.h")     \
               $(shell find $(SIM_CSRC_DIR) -name "*.h")     \
               $(shell find $(DIFFTEST_CSRC_DIR) -name "*.h")
EMU := $(BUILD_DIR)/emu

$(EMU_MK): $(SIM_TOP_V) | $(EMU_DEPS)
	@mkdir -p $(@D)
	@echo "\n[verilator] Generating C++ files..." >> $(TIMELOG)
	@date -R | tee -a $(TIMELOG)
	$(TIME_CMD) verilator --cc --exe $(VERILATOR_FLAGS) \
		-o $(abspath $(EMU)) -Mdir $(@D) $^ $(EMU_DEPS)

LOCK = /var/emu/emu.lock
LOCK_BIN = $(abspath $(BUILD_DIR)/lock-emu)
EMU_COMPILE_FILTER =
# 2> $(BUILD_DIR)/g++.err.log | tee $(BUILD_DIR)/g++.out.log | grep 'g++' | awk '{print "Compiling/Generating", $$NF}'

build_emu_local: $(EMU_MK)
	@echo "\n[g++] Compiling C++ files..." >> $(TIMELOG)
	@date -R | tee -a $(TIMELOG)
	$(TIME_CMD) $(MAKE) VM_PARALLEL_BUILDS=1 OPT_FAST="-O3" -C $(<D) -f $(<F) $(EMU_COMPILE_FILTER)

$(LOCK_BIN): ./scripts/utils/lock-emu.c
	gcc $^ -o $@

$(EMU): $(EMU_MK) $(EMU_DEPS) $(EMU_HEADERS) $(REF_SO) $(LOCK_BIN)
ifeq ($(REMOTE),localhost)
	$(MAKE) build_emu_local
else
	@echo "try to get emu.lock ..."
	ssh -tt $(REMOTE) '$(LOCK_BIN) $(LOCK)'
	@echo "get lock"
	ssh -tt $(REMOTE) 'export NOOP_HOME=$(NOOP_HOME); export NEMU_HOME=$(NEMU_HOME); $(MAKE) -C $(NOOP_HOME) -j230 build_emu_local'
	@echo "release lock ..."
	ssh -tt $(REMOTE) 'rm -f $(LOCK)'
endif

# log will only be printed when (B<=GTimer<=E) && (L < loglevel)
# use 'emu -h' to see more details
B ?= 0
E ?= -1

ifndef NOOP_HOME
$(error NOOP_HOME is not set)
endif
EMU_FLAGS = -s $(SEED) -b $(B) -e $(E) $(SNAPSHOT_OPTION) $(WAVEFORM) $(EMU_ARGS)

emu: $(EMU)

emu-run: emu
ifneq ($(REMOTE),localhost)
	ls build
endif
	$(EMU) -i $(IMAGE) --diff=$(REF_SO) $(EMU_FLAGS)

coverage:
	verilator_coverage --annotate build/logs/annotated --annotate-min 1 build/logs/coverage.dat
	python3 scripts/coverage/coverage.py build/logs/annotated/XSSimTop.v build/XSSimTop_annotated.v
	python3 scripts/coverage/statistics.py build/XSSimTop_annotated.v >build/coverage.log

.PHONY: build_emu_local