######################################################################
# Residual auto-configuration
######################################################################

include config.mk
MKFILES := Makefile config.mk

ifneq ($(MAKE_RESTARTS),)
CFG_INFO := $(info cfg: make restarts: $(MAKE_RESTARTS))
endif

CFG_INFO := $(info cfg: building on $(CFG_OSTYPE) $(CFG_CPUTYPE))

CFG_GCC_CFLAGS :=
CFG_GCC_LINK_FLAGS :=
CFG_BOOT_FLAGS := $(BOOT_FLAGS)
CFG_RUSTC_FLAGS := -nowarn

# On Darwin, we need to run dsymutil so the debugging information ends
# up in the right place.  On other platforms, it automatically gets
# embedded into the executable, so use a no-op command.
CFG_DSYMUTIL := true

ifeq ($(CFG_OSTYPE), FreeBSD)
  CFG_LIB_NAME=lib$(1).so
  CFG_GCC_CFLAGS += -fPIC -march=i686 -I/usr/local/include
  CFG_GCC_LINK_FLAGS += -shared -fPIC -lpthread -lrt
  ifeq ($(CFG_CPUTYPE), x86_64)
    CFG_GCC_CFLAGS += -m32
    CFG_GCC_LINK_FLAGS += -m32
  endif
  CFG_UNIXY := 1
endif

ifeq ($(CFG_OSTYPE), Linux)
  CFG_LIB_NAME=lib$(1).so
  CFG_GCC_CFLAGS += -fPIC -march=i686
  CFG_GCC_LINK_FLAGS += -shared -fPIC -ldl -lpthread -lrt
  ifeq ($(CFG_CPUTYPE), x86_64)
    CFG_GCC_CFLAGS += -m32
    CFG_GCC_LINK_FLAGS += -m32
  endif
  CFG_UNIXY := 1
endif

ifeq ($(CFG_OSTYPE), Darwin)
  CFG_LIB_NAME=lib$(1).dylib
  CFG_UNIXY := 1
  CFG_GCC_LINK_FLAGS += -dynamiclib -lpthread
  # Darwin has a very blurry notion of "64 bit", and claims it's running
  # "on an i386" when the whole userspace is 64-bit and the compiler
  # emits 64-bit binaries by default. So we just force -m32 here. Smarter
  # approaches welcome!
  CFG_GCC_CFLAGS += -m32
  CFG_GCC_LINK_FLAGS += -m32
  CFG_DSYMUTIL := dsymutil
endif

ifneq ($(findstring MINGW,$(CFG_OSTYPE)),)
  CFG_WINDOWSY := 1
endif

CFG_LDPATH :=$(CFG_BUILD_DIR)/rt
CFG_LDPATH :=$(CFG_LDPATH):$(CFG_BUILD_DIR)/llvmext

ifdef CFG_WINDOWSY
  CFG_INFO := $(info cfg: windows-y environment)

  CFG_EXE_SUFFIX := .exe
  CFG_LIB_NAME=$(1).dll
  CFG_LDPATH :=$(CFG_LDPATH):$(CFG_LLVM_BINDIR)
  CFG_LDPATH :=$(CFG_LDPATH):$$PATH
  CFG_RUN_PROGRAM=PATH=$(CFG_LDPATH) $(1)

  CFG_PATH_MUNGE := $(strip | perl -p                  \
                           -e 's@\\(.)@/\1@go;'        \
                           -e 's@^/([a-zA-Z])/@\1:/@o;')
  ifdef CFG_FLEXLINK
    CFG_BOOT_NATIVE := 1
  endif
  CFG_GCC_CFLAGS += -march=i686
  CFG_GCC_LINK_FLAGS += -shared -fPIC
endif

ifdef CFG_UNIXY
  CFG_INFO := $(info cfg: unix-y environment)

  CFG_EXE_SUFFIX :=
  CFG_LDPATH :=$(CFG_LDPATH):$(CFG_LLVM_LIBDIR)
  CFG_RUN_PROGRAM=\
      LD_LIBRARY_PATH=$(dir $(1)):$(CFG_LDPATH) $(CFG_VALGRIND) $(1)

  CFG_BOOT_NATIVE := 1

  ifdef MINGW_CROSS
    CFG_EXE_SUFFIX := .exe
    CFG_LIB_NAME=$(1).dll
    CFG_LDPATH :=$(CFG_LDPATH):$(CFG_LLVM_BINDIR)
    CFG_LDPATH :=$(CFG_LDPATH):$$PATH
    CFG_RUN_PROGRAM=PATH=$(CFG_LDPATH) $(1)

    CFG_INFO := $(info cfg: mingw-cross)
    CFG_GCC_CROSS := i586-mingw32msvc-
    CFG_BOOT_FLAGS += -t win32-x86-pe
    ifdef CFG_VALGRIND
      CFG_VALGRIND += wine
    endif
    CFG_GCC_CFLAGS := -march=i686
    CFG_GCC_LINK_FLAGS := -shared
    ifeq ($(CFG_CPUTYPE), x86_64)
      CFG_GCC_CFLAGS += -m32
      CFG_GCC_LINK_FLAGS += -m32
    endif
  endif
  ifdef CFG_VALGRIND
    CFG_VALGRIND += --leak-check=full \
                    --error-exitcode=1 \
                    --quiet --vex-iropt-level=0 \
                    --suppressions=$(S)src/etc/x86.supp
  endif
endif

CFG_RUNTIME :=$(call CFG_LIB_NAME,rustrt)
CFG_LLVMEXT :=$(call CFG_LIB_NAME,llvmext)
CFG_STDLIB :=$(call CFG_LIB_NAME,std)

CFG_LLC_CFLAGS := -march=x86

ifdef CFG_GCC
  CFG_INFO := $(info cfg: using gcc)
  CFG_GCC_CFLAGS += -Wall -Werror -fno-rtti -fno-exceptions -g
  CFG_GCC_LINK_FLAGS += -g
  CFG_COMPILE_C = $(CFG_GCC_CROSS)g++ $(CFG_GCC_CFLAGS) -c -o $(1) $(2)
  CFG_LINK_C = $(CFG_GCC_CROSS)g++ $(CFG_GCC_LINK_FLAGS) -o $(1)
  CFG_DEPEND_C = $(CFG_GCC_CROSS)g++ $(CFG_GCC_CFLAGS) -MT "$(1)" -MM $(2)
else
  CFG_ERR := $(error please try on a system with gcc)
endif

ifdef CFG_OCAMLC_OPT
  $(info cfg: have ocaml native compiler)
  OPT=.opt
else
  $(info cfg: have only ocaml bytecode compiler)
endif

ifdef BOOT_PROFILE
  $(info cfg: forcing native bootstrap compiler (BOOT_PROFILE))
  CFG_BOOT_NATIVE := 1
  CFG_OCAMLOPT_PROFILE_FLAGS := -p
endif

ifdef BOOT_DEBUG
  $(info cfg: forcing bytecode bootstrap compiler (DEBUG))
  CFG_BOOT_NATIVE :=
endif

ifdef CFG_BOOT_NATIVE
  $(info cfg: building native bootstrap compiler)
else
  $(info cfg: building bytecode bootstrap compiler)
endif

ifdef NO_VALGRIND
  $(info cfg: disabling valgrind (NO_VALGRIND))
  CFG_VALGRIND :=
endif

######################################################################
# Target-and-rule "utility variables"
######################################################################

ifdef VERBOSE
  Q :=
  E =
else
  Q := @
  E = echo $(1)
endif

R := $(CFG_RUN_PROGRAM)
S := $(CFG_SRC_DIR)
X := $(CFG_EXE_SUFFIX)

# Look in doc and src dirs.
VPATH := $(S)doc $(S)src

# Compilers we build, we now know how to run.
BOOT := $(Q)OCAMLRUNPARAM="b1" boot/rustboot$(X) $(CFG_BOOT_FLAGS) -L stage0
STAGE0 := $(Q)$(CFG_RUN_PROGRAM) stage0/rustc$(X) $(CFG_RUSTC_FLAGS) -L stage1
STAGE1 := $(Q)$(CFG_RUN_PROGRAM) stage1/rustc$(X) $(CFG_RUSTC_FLAGS) -L stage2

# "Source" files we generate in builddir along the way.
GENERATED := boot/fe/lexer.ml boot/version.ml

# Delete the built-in rules.
.SUFFIXES:
%:: %,v
%:: RCS/%,v
%:: RCS/%
%:: s.%
%:: SCCS/s.%

######################################################################
# Bootstrap compiler variables
######################################################################

# We must list them in link order.
# Nobody calculates the link-order DAG automatically, sadly.

BOOT_MLS :=                                              \
    $(addsuffix .ml,                                     \
        boot/version                                     \
        $(addprefix boot/util/, fmt common bits)         \
        $(addprefix boot/driver/, session)               \
        $(addprefix boot/fe/, ast token lexer parser     \
          extfmt pexp item cexp fuzz)                    \
        $(addprefix boot/be/, asm il abi)                \
        $(addprefix boot/me/, walk semant resolve alias  \
          simplify type dead layer effect typestate      \
         loop layout transutil trans dwarf)              \
        $(addprefix boot/be/, x86 ra pe elf macho)       \
        $(addprefix boot/driver/, lib glue main))        \

BOOT_CMOS := $(BOOT_MLS:.ml=.cmo)
BOOT_CMXS := $(BOOT_MLS:.ml=.cmx)
BOOT_OBJS := $(BOOT_MLS:.ml=.o)
BOOT_CMIS := $(BOOT_MLS:.ml=.cmi)

BS := $(S)src/boot/

BOOT_ML_DEP_INCS := -I $(BS)/fe   -I $(BS)/me      \
                    -I $(BS)/be   -I $(BS)/driver  \
                    -I $(BS)/util -I boot

BOOT_ML_INCS    :=  -I boot/fe   -I boot/me      \
                    -I boot/be   -I boot/driver  \
                    -I boot/util -I boot

BOOT_ML_LIBS        := unix.cma  nums.cma  bigarray.cma
BOOT_ML_NATIVE_LIBS := unix.cmxa nums.cmxa bigarray.cmxa
BOOT_OCAMLC_FLAGS   := -g $(BOOT_ML_INCS) -w Ael -warn-error Ael
BOOT_OCAMLOPT_FLAGS := -g $(BOOT_ML_INCS) -w Ael -warn-error Ael

######################################################################
# Runtime (C++) library variables
######################################################################

RUNTIME_CS := rt/sync/timer.cpp \
              rt/sync/sync.cpp \
              rt/sync/lock_and_signal.cpp \
              rt/rust.cpp \
              rt/rust_builtin.cpp \
              rt/rust_run_program.cpp \
              rt/rust_crate.cpp \
              rt/rust_crate_cache.cpp \
              rt/rust_crate_reader.cpp \
              rt/rust_comm.cpp \
              rt/rust_dom.cpp \
              rt/rust_task.cpp \
              rt/rust_task_list.cpp \
              rt/rust_proxy.cpp \
              rt/rust_chan.cpp \
              rt/rust_port.cpp \
              rt/rust_upcall.cpp \
              rt/rust_log.cpp \
              rt/rust_message.cpp \
              rt/rust_timer.cpp \
              rt/circular_buffer.cpp \
              rt/isaac/randport.cpp \
              rt/rust_srv.cpp \
              rt/rust_kernel.cpp \
              rt/memory_region.cpp \
              rt/test/rust_test_harness.cpp \
              rt/test/rust_test_runtime.cpp \
              rt/test/rust_test_util.cpp

RUNTIME_HDR := rt/globals.h \
               rt/rust.h \
               rt/rust_dwarf.h \
               rt/rust_internal.h \
               rt/rust_util.h \
               rt/rust_chan.h \
               rt/rust_port.h \
               rt/rust_dom.h \
               rt/rust_task.h \
               rt/rust_task_list.h \
               rt/rust_proxy.h \
               rt/rust_log.h \
               rt/rust_message.h \
               rt/circular_buffer.h \
               rt/util/array_list.h \
               rt/util/indexed_list.h \
               rt/util/synchronized_indexed_list.h \
               rt/util/hash_map.h \
               rt/sync/sync.h \
               rt/sync/timer.h \
               rt/sync/lock_free_queue.h \
               rt/rust_srv.h \
               rt/rust_kernel.h \
               rt/memory_region.h \
               rt/memory.h \
               rt/test/rust_test_harness.h \
               rt/test/rust_test_runtime.h \
               rt/test/rust_test_util.h

RUNTIME_INCS := -I $(S)src/rt/isaac -I $(S)src/rt/uthash
RUNTIME_OBJS := $(RUNTIME_CS:.cpp=.o)

######################################################################
# rustc LLVM-extensions (C++) library variables
######################################################################

LLVMEXT_CS := $(addprefix llvmext/, \
                MachOObjectFile.cpp Object.cpp RustWrapper.cpp)

LLVMEXT_HDR := llvmext/include/llvm-c/Object.h

LLVMEXT_INCS := -iquote $(CFG_LLVM_INCDIR) \
                -iquote $(S)src/llvmext/include
LLVMEXT_OBJS := $(LLVMEXT_CS:.cpp=.o)
LLVMEXT_LIBS := $(CFG_LLVM_LDFLAGS) $(CFG_LLVM_LIBS)

######################################################################
# Standard library variables
######################################################################

STDLIB_CRATE := lib/std.rc
STDLIB_INPUTS := $(wildcard $(addprefix $(S)src/lib/,*.rc *.rs */*.rs))

######################################################################
# rustc crate variables
######################################################################

COMPILER_CRATE := comp/rustc.rc
COMPILER_INPUTS := $(wildcard $(addprefix $(S)src/comp/, \
                                rustc.rc *.rs */*.rs))

######################################################################
# Single-target rules
######################################################################

all: boot/rustboot$(X)          \
     rt/$(CFG_RUNTIME)          \
     llvmext/$(CFG_LLVMEXT)     \
     stage0/$(CFG_STDLIB)       \
     stage1/$(CFG_STDLIB)       \
     stage0/rustc$(X)           \
     stage0/glue.o              \
     $(GENERATED)

rt/$(CFG_RUNTIME): $(RUNTIME_OBJS) $(MKFILES) $(RUNTIME_HDR)
	@$(call E, link: $@)
	$(Q)$(call CFG_LINK_C, $@) $(RUNTIME_OBJS)

llvmext/$(CFG_LLVMEXT): $(LLVMEXT_OBJS) $(MKFILES) $(LLVMEXT_HDR)
	@$(call E, link: $@)
	$(Q)$(call CFG_LINK_C, $@ $(LLVMEXT_OBJS) \
        $(CFG_LLVM_LIBS) $(CFG_LLVM_LDFLAGS))

ifdef CFG_BOOT_NATIVE
boot/rustboot$(X): $(BOOT_CMXS) $(MKFILES)
	@$(call E, link: $@)
	$(Q)ocamlopt$(OPT) -o $@ $(BOOT_OCAMLOPT_FLAGS) $(BOOT_ML_NATIVE_LIBS) \
        $(BOOT_CMXS)
else
boot/rustboot$(X): $(BOOT_CMOS) $(MKFILES)
	@$(call E, link: $@)
	$(Q)ocamlc$(OPT) -o $@ $(BOOT_OCAMLC_FLAGS) $(BOOT_ML_LIBS) $(BOOT_CMOS)
endif

boot/version.ml: $(MKFILES)
	@$(call E, git: $@)
	$(Q)git log -1 \
      --pretty=format:'let version = "prerelease (%h %ci)";;' >$@ || exit 1


stage0/$(CFG_STDLIB): $(S)src/$(STDLIB_CRATE) $(STDLIB_INPUTS) \
                      boot/rustboot$(X) $(MKFILES)
	@$(call E, compile: $@)
	$(BOOT) -shared -o $@ $<

stage1/$(CFG_STDLIB): $(S)src/$(STDLIB_CRATE) $(STDLIB_INPUTS) \
                      stage0/rustc$(X) $(MKFILES)
	@$(call E, compile: $@)
	$(STAGE0) -shared -o $@ $<


stage0/rustc$(X): $(S)src/$(COMPILER_CRATE) $(COMPILER_INPUTS) \
                  boot/rustboot$(X) rt/$(CFG_RUNTIME) \
                  stage0/$(CFG_STDLIB)
	@$(call E, compile: $@)
	$(BOOT) -minimal -o $@ $<
	$(Q)chmod 0755 $@

stage1/rustc$(X): $(S)src/$(COMPILER_CRATE) $(COMPILER_INPUTS) \
                  stage0/rustc$(X) rt/$(CFG_RUNTIME) \
                  stage1/$(CFG_STDLIB)
	@$(call E, compile: $@)
	$(STAGE0) -o $@ $<
	$(Q)chmod 0755 $@


stage0/glue.bc: stage0/rustc$(X) stage0/$(CFG_STDLIB) \
                llvmext/$(CFG_LLVMEXT) rt/$(CFG_RUNTIME)
	@$(call E, generate: $@)
	$(STAGE0) -o $@ -glue

stage1/glue.bc: stage1/rustc$(X) stage1/$(CFG_STDLIB) \
                llvmext/$(CFG_LLVMEXT) rt/$(CFG_RUNTIME)
	@$(call E, generate: $@)
	$(STAGE1) -o $@ -glue

######################################################################
# Pattern rules
######################################################################

rt/%.o: rt/%.cpp $(MKFILES)
	@$(call E, compile: $@)
	$(Q)$(call CFG_COMPILE_C, $@, $(RUNTIME_INCS)) $<

llvmext/%.o: llvmext/%.cpp $(MKFILES)
	@$(call E, compile: $@)
	$(Q)$(call CFG_COMPILE_C, $@, $(CFG_LLVM_CXXFLAGS) $(LLVMEXT_INCS)) $<

%.cmo: %.ml $(MKFILES)
	@$(call E, compile: $@)
	$(Q)ocamlc$(OPT) -c -o $@ $(BOOT_OCAMLC_FLAGS) $<

%.cmo: %.cmi $(MKFILES)

%.cmx %.o: %.ml $(MKFILES)
	@$(call E, compile: $@)
	$(Q)ocamlopt$(OPT) -c -o $@ $(BOOT_OCAMLOPT_FLAGS) $<

%.ml: %.mll $(MKFILES)
	@$(call E, lex-gen: $@)
	$(Q)ocamllex$(OPT) -q -o $@ $<

%.o: %.s
	@$(call E, assemble [llvm]: $@)
	$(Q)gcc $(CFG_GCC_CFLAGS) -o $@ -c $<

%.ll: %.bc
	@$(call E, dis [llvm]: $@)
	$(Q)$(CFG_LLVM_BINDIR)/llvm-dis -o $@ $<


%.s: %.bc
	@$(call E, compile [llvm]: $@)
	$(Q)$(CFG_LLVM_BINDIR)/llc $(CFG_LLC_CFLAGS) -o $@ $<


######################################################################
# Cleanup
######################################################################

.PHONY: clean

clean:
	@$(call E, cleaning)
	$(Q)rm -f $(foreach ext, cmx cmi cmo cma bc o a d $(X)     \
                             h cpp ml s                        \
                             out bc dSYM                       \
                             ,                                 \
                  $(wildcard     *.$(ext)                      \
                               */*.$(ext)                      \
                             */*/*.$(ext)                      \
                           */*/*/*.$(ext)                      \
                   ))