PYODIDE_ROOT=$(abspath .)

include Makefile.envs

.PHONY=check

CC=emcc
CXX=em++


all: check \
	check-emcc \
	dist/pyodide.asm.js \
	dist/pyodide.js \
	dist/pyodide.d.ts \
	dist/package.json \
	dist/python \
	dist/console.html \
	dist/pyodide-lock.json \
	dist/python_stdlib.zip \
	dist/test.html \
	dist/module_test.html \
	dist/webworker.js \
	dist/webworker_dev.js \
	dist/module_webworker_dev.js
	echo -e "\nSUCCESS!"

src/core/pyodide_pre.o: src/js/generated/_pyodide.out.js src/core/pre.js src/core/stack_switching/stack_switching.out.js
# Our goal here is to inject src/js/generated/_pyodide.out.js into an archive
# file so that when linked, Emscripten will include it. We use the same pathway
# that EM_JS uses, but EM_JS is itself unsuitable. Why? Because the C
# preprocessor / compiler modified strings and there is no "raw" strings
# feature. In particular, it seems to choke on regex in the JavaScript code. Our
# bundle includes vendored npm packages which we have no control over, so it is
# not simple to rewrite the code to restrict it to syntax that is legal inside
# of EM_JS.
#
# To get around this problem, we use an array initializer instead of a string
# initializer. We write a string file and then convert it to a .c file with xxd
# as suggested here:
# https://unix.stackexchange.com/questions/176111/how-to-dump-a-binary-file-as-a-c-c-string-literal
# We use `xxd -i -` which converts the input to a comma separated list of
# hexadecimal pairs which can go into an array initializer.
#
# EM_JS works by injecting a string variable into a special section called em_js
# called __em_js__<function_name>. The contents of this variable are of the form
# "argspec<::>body". The argspec is used to generate the JavaScript function
# declaration:
# https://github.com/emscripten-core/emscripten/blob/085fe968d43c7d3674376f29667d6e5f42b24966/emscripten.py?plain=1#L603
#
# The body has to start with a function block, but it is possible to inject
# extra stuff after the block ends. We make a 0-argument function called
# pyodide_js_init. Immediately after that we inject pre.js and then a call to
# the init function.
	# First the data file
	rm -f tmp.dat
	echo '()<::>{' >> tmp.dat                       # zero argument argspec and start body
	cat src/js/generated/_pyodide.out.js >> tmp.dat # All of _pyodide.out.js is body
	echo '}' >> tmp.dat                             # Close function body
	cat src/core/stack_switching/stack_switching.out.js >> tmp.dat
	cat src/core/pre.js >> tmp.dat                  # Execute pre.js too
	echo "pyodide_js_init();" >> tmp.dat            # Then execute the function.

	# Now generate the C file. Define a string __em_js__pyodide_js_init with
	# contents from tmp.dat
	rm -f src/core/pyodide_pre.gen.c
	echo '__attribute__((used)) __attribute__((section("em_js"), aligned(1)))' >> src/core/pyodide_pre.gen.c
	echo 'char __em_js__pyodide_js_init[] = {'  >> src/core/pyodide_pre.gen.c
	cat tmp.dat  | xxd -i - >> src/core/pyodide_pre.gen.c
	# Add a null byte to terminate the string
	echo ', 0};' >> src/core/pyodide_pre.gen.c
	echo "#include <emscripten.h>" >> src/core/pyodide_pre.gen.c
	echo "void pyodide_js_init(void) EM_IMPORT(pyodide_js_init);" >> src/core/pyodide_pre.gen.c
	echo "EMSCRIPTEN_KEEPALIVE void pyodide_export(void) { pyodide_js_init(); }" >> src/core/pyodide_pre.gen.c

	rm tmp.dat
	emcc -c src/core/pyodide_pre.gen.c -o src/core/pyodide_pre.o

dist/libpyodide.a: \
	src/core/docstring.o \
	src/core/error_handling.o \
	src/core/hiwire.o \
	src/core/_pyodide_core.o \
	src/core/js2python.o \
	src/core/jsproxy.o \
	src/core/pyproxy.o \
	src/core/python2js_buffer.o \
	src/core/jslib.o \
	src/core/jslib_asm.o \
	src/core/python2js.o \
	src/core/pyodide_pre.o \
	src/core/pyversion.o \
	src/core/stack_switching/pystate.o
	emar rcs dist/libpyodide.a $(filter %.o,$^)


dist/pyodide.asm.js: \
	src/core/main.o  \
	$(wildcard src/py/lib/*.py) \
	libgl \
	$(CPYTHONLIB) \
	dist/libpyodide.a
	date +"[%F %T] Building pyodide.asm.js..."
	[ -d dist ] || mkdir dist
	$(CXX) -o dist/pyodide.asm.js dist/libpyodide.a src/core/main.o $(MAIN_MODULE_LDFLAGS)

	if [[ -n $${PYODIDE_SOURCEMAP+x} ]] || [[ -n $${PYODIDE_SYMBOLS+x} ]] || [[ -n $${PYODIDE_DEBUG_JS+x} ]]; then \
		cd dist && npx prettier -w pyodide.asm.js ; \
	fi

   # Strip out C++ symbols which all start __Z.
   # There are 4821 of these and they have VERY VERY long names.
   # To show some stats on the symbols you can use the following:
   # cat dist/pyodide.asm.js | grep -ohE 'var _{0,5}.' | sort | uniq -c | sort -nr | head -n 20
	sed -i -E 's/var __Z[^;]*;//g' dist/pyodide.asm.js
	sed -i '1i "use strict";' dist/pyodide.asm.js
	# Remove last 4 lines of pyodide.asm.js, see issue #2282
	# Hopefully we will remove this after emscripten fixes it, upstream issue
	# emscripten-core/emscripten#16518
	# Sed nonsense from https://stackoverflow.com/a/13383331
	sed -i -n -e :a -e '1,4!{P;N;D;};N;ba' dist/pyodide.asm.js
	echo "globalThis._createPyodideModule = _createPyodideModule;" >> dist/pyodide.asm.js
	date +"[%F %T] done building pyodide.asm.js."


env:
	env


node_modules/.installed : src/js/package.json src/js/package-lock.json
	cd src/js && npm ci
	ln -sfn src/js/node_modules/ node_modules
	touch node_modules/.installed

dist/pyodide.js src/js/generated/_pyodide.out.js: src/js/*.ts src/js/generated/pyproxy.ts node_modules/.installed
	cd src/js && npm run tsc && node esbuild.config.mjs && cd -

src/core/stack_switching/stack_switching.out.js : src/core/stack_switching/*.mjs
	node src/core/stack_switching/esbuild.config.mjs

dist/package.json : src/js/package.json
	cp $< $@

.PHONY: npm-link
npm-link: dist/package.json
	cd src/test-js && npm ci && npm link ../../dist

dist/pyodide.d.ts dist/pyodide/ffi.d.ts: src/js/*.ts src/js/generated/pyproxy.ts node_modules/.installed
	npx dts-bundle-generator src/js/{pyodide,ffi}.ts --export-referenced-types false --project src/js/tsconfig.json
	mv src/js/{pyodide,ffi}.d.ts dist
	python3 tools/fixup-type-definitions.py dist/pyodide.d.ts
	python3 tools/fixup-type-definitions.py dist/ffi.d.ts


src/js/generated/pyproxy.ts : src/core/pyproxy.* src/core/*.h
	# We can't input pyproxy.js directly because CC will be unhappy about the file
	# extension. Instead cat it and have CC read from stdin.
	# -E : Only apply prepreocessor
	# -C : Leave comments alone (this allows them to be preserved in typescript
	#      definition files, rollup will strip them out)
	# -P : Don't put in macro debug info
	# -imacros pyproxy.c : include all of the macros definitions from pyproxy.c
	#
	# First we use sed to delete the segments of the file between
	# "// pyodide-skip" and "// end-pyodide-skip". This allows us to give
	# typescript type declarations for the macros which we need for intellisense
	# and documentation generation. The result of processing the type
	# declarations with the macro processor is a type error, so we snip them
	# out.
	mkdir -p src/js/generated
	rm -f $@
	echo "// This file is generated by applying the C preprocessor to core/pyproxy.ts" >> $@
	echo "// It uses the macros defined in core/pyproxy.c" >> $@
	echo "// Do not edit it directly!" >> $@
	cat src/core/pyproxy.ts | \
		sed '/^\/\/\s*pyodide-skip/,/^\/\/\s*end-pyodide-skip/d' | \
		$(CC) -E -C -P -imacros src/core/pyproxy.c $(MAIN_MODULE_CFLAGS) - | \
		sed 's/^#pragma clang.*//g' \
		>> $@

pyodide_build: ./pyodide-build/pyodide_build/**
	$(HOSTPYTHON) -m pip install -e ./pyodide-build
	which pyodide-build >/dev/null
	which pyodide >/dev/null

dist/python_stdlib.zip: pyodide_build $(CPYTHONLIB)
	pyodide create-zipfile $(CPYTHONLIB) src/py --compression-level "$(PYODIDE_ZIP_COMPRESSION_LEVEL)" --output $@

dist/test.html: src/templates/test.html
	cp $< $@

dist/module_test.html: src/templates/module_test.html
	cp $< $@

dist/python: src/templates/python
	cp $< $@

.PHONY: dist/console.html
dist/console.html: src/templates/console.html
	cp $< $@
	sed -i -e 's#{{ PYODIDE_BASE_URL }}#$(PYODIDE_BASE_URL)#g' $@

.PHONY: dist/webworker.js
dist/webworker.js: src/templates/webworker.js
	cp $< $@

.PHONY: dist/module_webworker_dev.js
dist/module_webworker_dev.js: src/templates/module_webworker.js
	cp $< $@

.PHONY: dist/webworker_dev.js
dist/webworker_dev.js: src/templates/webworker.js
	cp $< $@

.PHONY: libgl
libgl:
	# TODO(ryanking13): Link this to a side module not to the main module.
	# For unknown reason, a side module cannot see symbols when libGL is linked to it.
	embuilder build libgl

.PHONY: lint
lint:
	pre-commit run -a --show-diff-on-failure

benchmark: all
	$(HOSTPYTHON) benchmark/benchmark.py all --output dist/benchmarks.json
	$(HOSTPYTHON) benchmark/plot_benchmark.py dist/benchmarks.json dist/benchmarks.png


clean:
	rm -fr dist/*
	rm -fr node_modules
	find src -name '*.o' -delete
	find src -name '*.gen.*' -delete
	find src -name '*.out.*' -delete
	rm -fr src/js/generated
	make -C packages clean
	echo "The Emsdk, CPython are not cleaned. cd into those directories to do so."

clean-python: clean
	make -C cpython clean

clean-all: clean
	make -C emsdk clean
	make -C cpython clean-all

src/core/jslib_asm.o: src/core/jslib_asm.s
	$(CC) -o $@ -c $< $(MAIN_MODULE_CFLAGS)


%.o: %.c $(CPYTHONLIB) $(wildcard src/core/*.h src/core/*.js)
	$(CC) -o $@ -c $< $(MAIN_MODULE_CFLAGS) -Isrc/core/


$(CPYTHONLIB): emsdk/emsdk/.complete
	date +"[%F %T] Building cpython..."
	make -C $(CPYTHONROOT)
	date +"[%F %T] done building cpython..."


dist/pyodide-lock.json: FORCE pyodide_build
	date +"[%F %T] Building packages..."
	make -C packages
	date +"[%F %T] done building packages..."


emsdk/emsdk/.complete:
	date +"[%F %T] Building emsdk..."
	make -C emsdk
	date +"[%F %T] done building emsdk."


rust:
	echo -e '\033[0;31m[WARNING] The target `make rust` is only for development and we do not guarantee that it will work or be maintained.\033[0m'
	wget -q -O - https://sh.rustup.rs | sh -s -- -y
	source $(HOME)/.cargo/env && rustup toolchain install $(RUST_TOOLCHAIN) && rustup default $(RUST_TOOLCHAIN)
	source $(HOME)/.cargo/env && rustup target add wasm32-unknown-emscripten --toolchain $(RUST_TOOLCHAIN)

FORCE:


check:
	./tools/dependency-check.sh


check-emcc: emsdk/emsdk/.complete
	python3 tools/check_ccache.py


debug :
	EXTRA_CFLAGS+=" -D DEBUG_F" \
	make