########
## This file expresses the rules required to compile with Preprocessor NanoLog.
## It defines a macro (run-cxx) to preprocess and compile user source files,
## and the rules required to build the NanoLog library.
##
## Users are expected to:
##	 1) Define the macro NANOLOG_DIR to point to the NanoLog directory
##      and the macro USER_OBJS to list all *.o to be produced by the
##      user executing run-cxx on their source files.
##	 2) Use run-cxx to compile their sources (see documentation below)
##   3) Add the following variable definition in their sources
##					EXTRA_NANOLOG_FLAGS=-DPREPROCESSOR_NANOLOG
##   4) Include this MakeFrag in their main GNUmakefile
##
## The sample_preprocessor/GNUmakefile shows an example of the integration.
#######

RUNTIME_DIR=$(NANOLOG_DIR)/runtime
PREPROC_DIR=$(NANOLOG_DIR)/preprocessor

# run-cxx:
# Compile a user C++ source file to an object file using the NanoLog system.
# The first parameter $(1) should be the output filename (*.o)
# The second parameter $(2) should be the input filename (*.cc)
# The optional third parameter $(3) should be additional options compiler options.
# The optional fourth parameter ($4) should be gnu preprocessor options.
define run-cxx
	$(CXX) -E -I $(RUNTIME_DIR) $(2) -o $(2).i -std=c++11 $(4)
	@mkdir -p generated
	python $(PREPROC_DIR)/parser.py --mapOutput="generated/$(2).map" $(2).i
	$(CXX) -I $(RUNTIME_DIR) -c -o $(1) $(2).ii $(3)
	@rm -f $(2).i $(2).ii generated/GeneratedCode.cc
endef

RUNTIME_CXX_FLAGS= -std=c++11 -O3 -DNDEBUG -g
NANO_LOG_LIBRARY_LIBS=-lrt -pthread

COMWARNS := -Wall -Wformat=2 -Wextra \
           -Wwrite-strings -Wno-unused-parameter -Wmissing-format-attribute
CWARNS   := $(COMWARNS) -Wmissing-prototypes -Wmissing-declarations -Wshadow \
		-Wbad-function-cast
CXXWARNS := $(COMWARNS) -Wno-non-template-friend -Woverloaded-virtual \
		-Wcast-qual -Wcast-align -Wno-address-of-packed-member -Wconversion -Weffc++

LIB_SRCFILES=Cycles.cc NanoLog.cc Util.cc Log.cc RuntimeLogger.cc TimeTrace.cc
RUNTIME_CC=$(addprefix $(RUNTIME_DIR)/,$(LIB_SRCFILES))
RUNTIME_OBJS=$(addprefix generated/library/, $(LIB_SRCFILES:.cc=.o))

.PHONY: all
all:

# Collates the metadata generated by run-cxx and constructs a generated source
# file and its object file
generated/GeneratedCode.o: $(USER_OBJS)
	@mkdir -p generated
	python $(PREPROC_DIR)/parser.py --combinedOutput="generated/GeneratedCode.cc" $(shell find generated -type f -name "*.map" -printf ' "%h/%f" ')
	$(CXX) $(RUNTIME_CXX_FLAGS) $(CXXWARNS) -c -o $@ generated/GeneratedCode.cc -I $(RUNTIME_DIR) -Igenerated

# Builds the static parts of the NanoLog library that don't change
generated/library/%.o: $(RUNTIME_DIR)/%.cc
	@mkdir -p generated/library
	$(CXX) $(RUNTIME_CXX_FLAGS) $(CXXWARNS) -c -I $(RUNTIME_DIR) -Igenerated $(EXTRA_NANOLOG_FLAGS) -o $@ $<

# Constructs the customized NanoLog library and decompressor for this compilation.
# It is unique per user source compilation via the dependency on GeneratedCode.o -> $(USER_OBJS)
libNanoLog.a: $(RUNTIME_OBJS) generated/GeneratedCode.o decompressor
	ar -cr libNanoLog.a $(RUNTIME_OBJS) generated/GeneratedCode.o

decompressor: $(RUNTIME_OBJS) generated/GeneratedCode.o $(RUNTIME_DIR)/LogDecompressor.cc
	$(CXX) $(RUNTIME_CXX_FLAGS) $(CXXWARNS) $^ -I$(RUNTIME_DIR) -Igenerated $(NANO_LOG_LIBRARY_LIBS) $(EXTRA_NANOLOG_FLAGS) -o decompressor

clean-all: clean
	@rm -f libNanoLog.a $(RUNTIME_OBJS) decompressor
	@rm -rf generated $(RUNTIME_DIR)/.depend

# Automatic rules to build *.h dependencies for NanoLog. Taken from
# https://stackoverflow.com/questions/2394609/makefile-header-dependencies
depend: .depend_nanolog

.depend_nanolog: $(RUNTIME_CC)
	@rm -f $(RUNTIME_DIR)/.depend
	$(CXX) $(RUNTIME_CXX_FLAGS) -I $(RUNTIME_DIR) -MM $^  > .depend_nanolog;
	@sed -i -E "s#(^[^ ])#$(RUNTIME_DIR)/\1#" .depend_nanolog

include .depend_nanolog