Makefile

ifndef TOP_LEVEL_MAKEFILE_INVOKED
$(error Please invoke the top-level Makefile)
endif

SRC := src
OUT := out
CLASSES := $(OUT)/classes

# File indicating whether .class files have been produced.
CLS_STAMP := $(CLASSES)/cls_stamp

JAVA_SRC := $(shell find src -name "*.java")
JAVA_CLS := $(JAVA_SRC:$(SRC)/%.java=$(CLASSES)/%.class)
JAVA_LL := $(JAVA_SRC:$(SRC)/%.java=$(OUT)/%.ll)
JAVA_OBJ := $(JAVA_LL:%.ll=%.o)

NATIVE_SRC := $(shell find native -name "*.cpp")
NATIVE_OBJ := $(NATIVE_SRC:%.cpp=$(OUT)/%.o)

ALL_OBJ := $(JAVA_OBJ) $(NATIVE_OBJ)

PLC_FLAGS := -assert
ifdef DBUG
DEBUG_FLAGS := -dump-desugared
endif
JAVA_FLAGS := -g -Wno-override-module -fPIC
NATIVE_FLAGS := -g -std=c++14 $(JNI_INCLUDES) -fPIC -Wall -pthread

all: classes $(LIBJDK)

.PHONY: classes
classes: $(CLS_STAMP)

# Runtime Java code (.java --> .class)
$(CLS_STAMP): $(JAVA_SRC)
	@echo "Compiling $(words $(JAVA_SRC)) Java files with javac (.java --> .class)"
	@mkdir -p $(CLASSES)
	@$(JAVAC) -d $(CLASSES) $(JAVA_SRC)
	@date > $@

# Compile JDK Java code (.java --> .ll)
$(JAVA_LL): $(JAVA_SRC) $(PLC_SRC)
	@echo "Compiling $(words $(JAVA_SRC)) Java files with JLang (.java --> .ll)"
	@# We compile java.lang.Object separately, since otherwise
	@# we get duplicate class errors from Polyglot. (TODO)
	@$(PLC) -c -d $(OUT) $(DEBUG_FLAGS) $(filter %Object.java,$(JAVA_SRC)) > dump.txt
	@$(PLC) -c -d $(OUT) $(DEBUG_FLAGS) $(filter-out %Object.java,$(JAVA_SRC)) >> dump.txt

# Compile LLVM IR (.ll --> .o).
$(JAVA_OBJ): %.o: %.ll
	@echo "Compiling $<"
	@$(CLANG) $(JAVA_FLAGS) -c -o $@ $<

# Native code (.cpp --> .o).
$(NATIVE_OBJ): $(OUT)/%.o: %.cpp
	@mkdir -p $(dir $@)
	@echo "Compiling $<"
	@$(CLANG) $(NATIVE_FLAGS) -c -o $@ $<

# Create a shared library for compiled JDK classes.
$(LIBJDK): $(ALL_OBJ)
	@echo "Creating libjdk"
	@$(CLANG) $(LIBJVM) $(LIBJDK_FLAGS) -o $@ $^

clean:
	rm -rf $(OUT)

.PHONY: all clean