rustcの出力するLLVM IRから実行可能ファイルを生成するデモを追加

example/Makefile

 include ../common.mk
 
-.PHONY: all test clean
-
 all:
 	${MAKE} -C fizzbuzz    all
 	${MAKE} -C 8cc         all
 	${MAKE} -C zlib        all
+	${MAKE} -C fizzbuzz-rs all
 
 test:
 	${MAKE} -C fizzbuzz    test
 	${MAKE} -C 8cc         test
 	${MAKE} -C zlib        test
+	${MAKE} -C fizzbuzz-rs test

example/fizzbuzz-rs/Makefile

+include ../../common.mk
+
+LDFLAGS := \
+	-pthread \
+	-lbacktrace \
+	-ldl \
+	-ljemalloc
+
+all: ${BIN_DIR}/fizzbuzz.out #${BIN_DIR}/fizzbuzz-wm.out
+
+${BIN_DIR}/fizzbuzz.out: ${OBJ_DIR}/fizzbuzz.ll ${OBJ_DIR}/probestack.o
+	@mkdir -p ${@D}
+	clang -o $@ $^ ${LDFLAGS}
+
+${OBJ_DIR}/fizzbuzz.ll: fizzbuzz.rs
+	@mkdir -p ${@D}
+	rustc -O -Clto --emit=llvm-ir -o $@ $<
+
+${OBJ_DIR}/probestack.o: probestack.s
+	@mkdir -p ${@D}
+	clang -o $@ -c $<

example/fizzbuzz-rs/fizzbuzz.rs

+fn main() {
+	(1 ..= 50).for_each(|i| match (i % 3, i % 5) {
+		(0, 0) => println!("Fizz Buzz"),
+		(0, _) => println!("Fizz"),
+		(_, 0) => println!("Buzz"),
+		(_, _) => println!("{}", i),
+	});
+}

example/fizzbuzz-rs/probestack.s

+# To avoid undefined reference to `__rust_probestack`.
+# From https://github.com/rust-lang-nursery/compiler-builtins/blob/master/src/probestack.rs
+
+	.global __rust_probestack
+__rust_probestack:
+	mov %rax, %r11
+	cmp $0x1000, %r11
+	jna 3f
+2:
+	sub $0x1000, %rsp
+	test %rsp, 8(%rsp)
+	sub $0x1000, %r11
+	cmp $0x1000, %r11
+	ja 2b
+3:
+	sub %r11, %rsp
+	test %rsp, 8(%rsp)
+	add %rax, %rsp
+	ret