# This is a procedure to define the targets for building
# the runtime.
#
# Argument 1 is the target triple.
#
# This is not really the right place to explain this, but
# for those of you who are not Makefile gurus, let me briefly
# cover the $ expansion system in use here, because it
# confused me for a while!  The variable DEF_RUNTIME_TARGETS
# will be defined once and then expanded with different
# values substituted for $(1) each time it is called.
# That resulting text is then eval'd.
#
# For most variables, you could use a single $ sign.  The result
# is that the substitution would occur when the CALL occurs,
# I believe.  The problem is that the automatic variables $< and $@
# need to be expanded-per-rule.  Therefore, for those variables at
# least, you need $$< and $$@ in the variable text.  This way, after
# the CALL substitution occurs, you will have $< and $@.  This text
# will then be evaluated, and all will work as you like.
#
# Reader beware, this explanantion could be wrong, but it seems to
# fit the experimental data (i.e., I was able to get the system
# working under these assumptions).

# when we're doing a snapshot build, we intentionally degrade as many
# features in libuv and the runtime as possible, to ease portability.

SNAP_DEFINES:=
ifneq ($(strip $(findstring snap,$(MAKECMDGOALS))),)
	SNAP_DEFINES=-DRUST_SNAPSHOT
endif

define DEF_LIBUV_ARCH_VAR
  LIBUV_ARCH_$(1) = $$(subst i386,ia32,$$(subst x86_64,x64,$$(HOST_$(1))))
endef
$(foreach t,$(CFG_TARGET),$(eval $(call DEF_LIBUV_ARCH_VAR,$(t))))

ifdef CFG_ENABLE_FAST_MAKE
LIBUV_DEPS := $(S)/.gitmodules
else
LIBUV_DEPS := $(wildcard \
              $(S)src/libuv/* \
              $(S)src/libuv/*/* \
              $(S)src/libuv/*/*/* \
              $(S)src/libuv/*/*/*/*)
endif

LIBUV_NO_LOAD = run-benchmarks.target.mk run-tests.target.mk \
		uv_dtrace_header.target.mk uv_dtrace_provider.target.mk

export PYTHONPATH := $(PYTHONPATH):$(S)src/gyp/pylib

define DEF_RUNTIME_TARGETS

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

# $(1) is the target triple
# $(2) is the stage number

RUNTIME_CFLAGS_$(1)_$(2) = -D_RUST_STAGE$(2)
RUNTIME_CXXFLAGS_$(1)_$(2) = -D_RUST_STAGE$(2)

# XXX: Like with --cfg stage0, pass the defines for stage1 to the stage0
# build of non-build-triple host compilers
ifeq ($(2),0)
ifneq ($(strip $(CFG_BUILD)),$(strip $(1)))
RUNTIME_CFLAGS_$(1)_$(2) = -D_RUST_STAGE1
RUNTIME_CXXFLAGS_$(1)_$(2) = -D_RUST_STAGE1
endif
endif

RUNTIME_CXXS_$(1)_$(2) := \
	      rt/rust_cxx_glue.cpp

RUNTIME_CS_$(1)_$(2) := \
              rt/rust_builtin.c \
              rt/rust_upcall.c \
              rt/miniz.c \
              rt/rust_android_dummy.c \
              rt/rust_test_helpers.c

# stage0 remove this after the next snapshot
%.cpp:
	@touch tmp/foo.o

RUNTIME_S_$(1)_$(2) := rt/arch/$$(HOST_$(1))/_context.S \
			rt/arch/$$(HOST_$(1))/record_sp.S

RT_BUILD_DIR_$(1)_$(2) := $$(RT_OUTPUT_DIR_$(1))/stage$(2)

RUNTIME_DEF_$(1)_$(2) := $$(RT_OUTPUT_DIR_$(1))/rustrt$$(CFG_DEF_SUFFIX_$(1))
RUNTIME_INCS_$(1)_$(2) := -I $$(S)src/rt -I $$(S)src/rt/isaac -I $$(S)src/rt/uthash \
                     -I $$(S)src/rt/arch/$$(HOST_$(1))
RUNTIME_OBJS_$(1)_$(2) := $$(RUNTIME_CXXS_$(1)_$(2):rt/%.cpp=$$(RT_BUILD_DIR_$(1)_$(2))/%.o) \
                     $$(RUNTIME_CS_$(1)_$(2):rt/%.c=$$(RT_BUILD_DIR_$(1)_$(2))/%.o) \
                     $$(RUNTIME_S_$(1)_$(2):rt/%.S=$$(RT_BUILD_DIR_$(1)_$(2))/%.o)
ALL_OBJ_FILES += $$(RUNTIME_OBJS_$(1)_$(2))

MORESTACK_OBJS_$(1)_$(2) := $$(RT_BUILD_DIR_$(1)_$(2))/arch/$$(HOST_$(1))/morestack.o
ALL_OBJ_FILES += $$(MORESTACK_OBJS_$(1)_$(2))

$$(RT_BUILD_DIR_$(1)_$(2))/rust_cxx_glue.o: rt/rust_cxx_glue.cpp $$(MKFILE_DEPS)
	@$$(call E, compile: $$@)
	$$(Q)$$(call CFG_COMPILE_CXX_$(1), $$@, $$(RUNTIME_INCS_$(1)_$(2)) \
                 $$(SNAP_DEFINES) $$(RUNTIME_CXXFLAGS_$(1)_$(2))) $$<

$$(RT_BUILD_DIR_$(1)_$(2))/%.o: rt/%.c $$(MKFILE_DEPS)
	@$$(call E, compile: $$@)
	$$(Q)$$(call CFG_COMPILE_C_$(1), $$@, $$(RUNTIME_INCS_$(1)_$(2)) \
                 $$(SNAP_DEFINES) $$(RUNTIME_CFLAGS_$(1)_$(2))) $$<

$$(RT_BUILD_DIR_$(1)_$(2))/%.o: rt/%.S  $$(MKFILE_DEPS) \
                     $$(LLVM_CONFIG_$$(CFG_BUILD))
	@$$(call E, compile: $$@)
	$$(Q)$$(call CFG_ASSEMBLE_$(1),$$@,$$<)

$$(RT_BUILD_DIR_$(1)_$(2))/arch/$$(HOST_$(1))/libmorestack.a: $$(MORESTACK_OBJS_$(1)_$(2))
	@$$(call E, link: $$@)
	$$(Q)$(AR_$(1)) rcs $$@ $$^

$$(RT_BUILD_DIR_$(1)_$(2))/$(CFG_RUNTIME_$(1)): $$(RUNTIME_OBJS_$(1)_$(2)) $$(MKFILE_DEPS) \
                        $$(RUNTIME_DEF_$(1)_$(2))
	@$$(call E, link: $$@)
	$$(Q)$$(call CFG_LINK_CXX_$(1),$$@, $$(RUNTIME_OBJS_$(1)_$(2)) \
	    $$(CFG_LIBUV_LINK_FLAGS_$(1)),$$(RUNTIME_DEF_$(1)_$(2)),$$(CFG_RUNTIME_$(1)))

# These could go in rt.mk or rustllvm.mk, they're needed for both.

# This regexp has a single $$ escaped twice
$(1)/%.bsd.def:    %.def.in $$(MKFILE_DEPS)
	@$$(call E, def: $$@)
	$$(Q)echo "{" > $$@
	$$(Q)sed 's/.$$$$/&;/' $$< >> $$@
	$$(Q)echo "};" >> $$@

$(1)/%.linux.def:    %.def.in $$(MKFILE_DEPS)
	@$$(call E, def: $$@)
	$$(Q)echo "{" > $$@
	$$(Q)sed 's/.$$$$/&;/' $$< >> $$@
	$$(Q)echo "};" >> $$@

$(1)/%.darwin.def:	%.def.in $$(MKFILE_DEPS)
	@$$(call E, def: $$@)
	$$(Q)sed 's/^./_&/' $$< > $$@

$(1)/%.android.def:  %.def.in $$(MKFILE_DEPS)
	@$$(call E, def: $$@)
	$$(Q)echo "{" > $$@
	$$(Q)sed 's/.$$$$/&;/' $$< >> $$@
	$$(Q)echo "};" >> $$@

$(1)/%.mingw32.def:	%.def.in $$(MKFILE_DEPS)
	@$$(call E, def: $$@)
	$$(Q)echo LIBRARY $$* > $$@
	$$(Q)echo EXPORTS >> $$@
	$$(Q)sed 's/^./    &/' $$< >> $$@

endef


######################################################################
# Runtime third party targets (libuv, jemalloc, etc.)
#
# These targets do not need to be built once per stage, so these
# rules just build them once and then we're done with them.
######################################################################

define DEF_THIRD_PARTY_TARGETS

# $(1) is the target triple

RT_OUTPUT_DIR_$(1) := $(1)/rt

ifeq ($$(CFG_WINDOWSY_$(1)), 1)
  LIBUV_OSTYPE_$(1) := win
else ifeq ($(OSTYPE_$(1)), apple-darwin)
  LIBUV_OSTYPE_$(1) := mac
else ifeq ($(OSTYPE_$(1)), unknown-freebsd)
  LIBUV_OSTYPE_$(1) := freebsd
else ifeq ($(OSTYPE_$(1)), linux-androideabi)
  LIBUV_OSTYPE_$(1) := android
  LIBUV_ARGS_$(1) := PLATFORM=android host=android OS=linux
else
  LIBUV_OSTYPE_$(1) := linux
endif

LIBUV_NAME_$(1) := $$(call CFG_STATIC_LIB_NAME_$(1),uv)
LIBUV_LIB_$(1) := $$(RT_OUTPUT_DIR_$(1))/libuv/$$(LIBUV_NAME_$(1))

LIBUV_MAKEFILE_$(1) := $$(CFG_BUILD_DIR)$$(RT_OUTPUT_DIR_$(1))/libuv/Makefile

# libuv triggers a few warnings on some platforms
LIBUV_CFLAGS_$(1) := $(subst -Werror,,$(CFG_GCCISH_CFLAGS_$(1)))

$$(LIBUV_MAKEFILE_$(1)): $$(LIBUV_DEPS)
	(cd $(S)src/libuv/ && \
	 $$(CFG_PYTHON) ./gyp_uv.py -f make -Dtarget_arch=$$(LIBUV_ARCH_$(1)) \
	   -D ninja \
	   -DOS=$$(LIBUV_OSTYPE_$(1)) \
	   -Goutput_dir=$$(@D) --generator-output $$(@D))

# Windows has a completely different build system for libuv because of mingw. In
# theory when we support msvc then we should be using gyp's msvc output instead
# of mingw's makefile for windows
ifdef CFG_WINDOWSY_$(1)
$$(LIBUV_LIB_$(1)): $$(LIBUV_DEPS)
	$$(Q)$$(MAKE) -C $$(S)src/libuv -f Makefile.mingw \
		LDFLAGS="$$(CFG_GCCISH_LINK_FLAGS_$(1))" \
		CC="$$(CC_$(1)) $$(LIBUV_CFLAGS_$(1)) $$(SNAP_DEFINES)" \
		CXX="$$(CXX_$(1))" \
		AR="$$(AR_$(1))" \
		V=$$(VERBOSE)
	$$(Q)cp $$(S)src/libuv/libuv.a $$@
else
$$(LIBUV_LIB_$(1)): $$(LIBUV_DEPS) $$(LIBUV_MAKEFILE_$(1))
	$$(Q)$$(MAKE) -C $$(@D) \
		CFLAGS="$$(LIBUV_CFLAGS_$(1)) $$(SNAP_DEFINES)" \
		LDFLAGS="$$(CFG_GCCISH_LINK_FLAGS_$(1))" \
		CC="$$(CC_$(1))" \
		CXX="$$(CXX_$(1))" \
		AR="$$(AR_$(1))" \
		$$(LIBUV_ARGS_$(1)) \
		builddir="." \
		BUILDTYPE=Release \
		NO_LOAD="$$(LIBUV_NO_LOAD)" \
		V=$$(VERBOSE)
endif

# libuv support functionality (extra C/C++ that we need to use libuv)

UV_SUPPORT_NAME_$(1) := $$(call CFG_STATIC_LIB_NAME_$(1),uv_support)
UV_SUPPORT_DIR_$(1) := $$(RT_OUTPUT_DIR_$(1))/uv_support
UV_SUPPORT_LIB_$(1) := $$(UV_SUPPORT_DIR_$(1))/$$(UV_SUPPORT_NAME_$(1))
UV_SUPPORT_CS_$(1) := rt/rust_uv.c
UV_SUPPORT_OBJS_$(1) := $$(UV_SUPPORT_CS_$(1):rt/%.c=$$(UV_SUPPORT_DIR_$(1))/%.o)

$$(UV_SUPPORT_DIR_$(1))/%.o: rt/%.c
	@$$(call E, compile: $$@)
	@mkdir -p $$(@D)
	$$(Q)$$(call CFG_COMPILE_C_$(1), $$@, \
		-I $$(S)src/libuv/include \
                 $$(RUNTIME_CFLAGS_$(1))) $$<

$$(UV_SUPPORT_LIB_$(1)): $$(UV_SUPPORT_OBJS_$(1))
	@$$(call E, link: $$@)
	$$(Q)$$(AR_$(1)) rcs $$@ $$^

# sundown markdown library (used by librustdoc)

SUNDOWN_NAME_$(1) := $$(call CFG_STATIC_LIB_NAME_$(1),sundown)
SUNDOWN_DIR_$(1) := $$(RT_OUTPUT_DIR_$(1))/sundown
SUNDOWN_LIB_$(1) := $$(SUNDOWN_DIR_$(1))/$$(SUNDOWN_NAME_$(1))

SUNDOWN_CS_$(1) := rt/sundown/src/autolink.c \
			rt/sundown/src/buffer.c \
			rt/sundown/src/stack.c \
			rt/sundown/src/markdown.c \
			rt/sundown/html/houdini_href_e.c \
			rt/sundown/html/houdini_html_e.c \
			rt/sundown/html/html_smartypants.c \
			rt/sundown/html/html.c

SUNDOWN_OBJS_$(1) := $$(SUNDOWN_CS_$(1):rt/%.c=$$(SUNDOWN_DIR_$(1))/%.o)

$$(SUNDOWN_DIR_$(1))/%.o: rt/%.c
	@$$(call E, compile: $$@)
	@mkdir -p $$(@D)
	$$(Q)$$(call CFG_COMPILE_C_$(1), $$@, \
		-I $$(S)src/rt/sundown/src -I $$(S)src/rt/sundown/html \
                 $$(RUNTIME_CFLAGS_$(1))) $$<

$$(SUNDOWN_LIB_$(1)): $$(SUNDOWN_OBJS_$(1))
	@$$(call E, link: $$@)
	$$(Q)$$(AR_$(1)) rcs $$@ $$^

endef

# Instantiate template for all stages/targets
$(foreach target,$(CFG_TARGET), \
     $(eval $(call DEF_THIRD_PARTY_TARGETS,$(target))))
$(foreach stage,$(STAGES), \
    $(foreach target,$(CFG_TARGET), \
	 $(eval $(call DEF_RUNTIME_TARGETS,$(target),$(stage)))))