Implement mqjsc compiler for standalone MicroQuickJS executables

Makefile

@@ -75,7 +75,7 @@ ifdef CONFIG_ARM32
 MQJS_BUILD_FLAGS=-m32
 endif
 
-PROGS=mqjs$(EXE) example$(EXE)
+PROGS=mqjs$(EXE) mqjsc$(EXE) example$(EXE)
 TEST_PROGS=dtoa_test libm_test 
 
 all: $(PROGS)
@@ -86,6 +86,9 @@ LIBS=-lm
 mqjs$(EXE): $(MQJS_OBJS)
 	$(CC) $(LDFLAGS) -o $@ $^ $(LIBS)
 
+mqjsc$(EXE): mqjsc.o mqjs_runtime.o mquickjs.o dtoa.o libm.o cutils.o
+	$(CC) $(LDFLAGS) -o $@ $^ $(LIBS)
+
 mquickjs.o: mquickjs_atom.h
 
 mqjs_stdlib: mqjs_stdlib.host.o mquickjs_build.host.o
@@ -98,6 +101,7 @@ mqjs_stdlib.h: mqjs_stdlib
 	./mqjs_stdlib $(MQJS_BUILD_FLAGS) > $@
 
 mqjs.o: mqjs_stdlib.h
+mqjsc.o: mqjs_stdlib.h
 
 # C API example
 example.o: example_stdlib.h
@@ -111,13 +115,19 @@ example_stdlib: example_stdlib.host.o mquickjs_build.host.o
 example_stdlib.h: example_stdlib
 	./example_stdlib $(MQJS_BUILD_FLAGS) > $@
 
+mqjs.o: mqjs.c
+	$(CC) $(CFLAGS) -DCONFIG_REPL -c -o $@ $<
+
+mqjs_runtime.o: mqjs.c
+	$(CC) $(CFLAGS) -c -o $@ $<
+
 %.o: %.c
 	$(CC) $(CFLAGS) -c -o $@ $<
 
 %.host.o: %.c
 	$(HOST_CC) $(HOST_CFLAGS) -c -o $@ $<
 
-test: mqjs example
+test: mqjs example mqjsc
 	./mqjs tests/test_closure.js
 	./mqjs tests/test_language.js
 	./mqjs tests/test_loop.js
@@ -127,6 +137,7 @@ test: mqjs example
 #	@sha256sum -c test_builtin.sha256
 	./mqjs -b test_builtin.bin
 	./example tests/test_rect.js
+	./tests/test_mqjsc.sh
 
 microbench: mqjs
 	./mqjs tests/microbench.js
@@ -147,6 +158,6 @@ rempio2_test: tests/rempio2_test.o libm.o
 	$(CC) $(LDFLAGS) -o $@ $^ $(LIBS)
 
 clean:
-	rm -f *.o *.d *~ tests/*.o tests/*.d tests/*~ test_builtin.bin mqjs_stdlib mqjs_stdlib.h mquickjs_build_atoms mquickjs_atom.h mqjs_example example_stdlib example_stdlib.h $(PROGS) $(TEST_PROGS)
+	rm -f *.o *.d *~ tests/*.o tests/*.d tests/*~ test_builtin.bin mqjs_stdlib mqjs_stdlib.h mquickjs_build_atoms mquickjs_atom.h mqjs_example example_stdlib example_stdlib.h $(PROGS) $(TEST_PROGS) a.out
 
 -include $(wildcard *.d)

README.md

@@ -64,6 +64,33 @@ system.
 Use the option `--no-column` to remove the column number debug info
 (only line numbers are remaining) if you want to save some storage.
 
+## Compiler
+
+The compiler is `mqjsc`. It can produce a standalone C program binary
+executable that embeds the MicroQuickJS runtime along with
+precompiled bytecode. Usage:
+
+```
+usage: mqjsc [options] [file]
+-h  --help            list options
+-o FILE               set the output executable (default = a.out)
+-c                    only output the C source file
+-m32                  force 32 bit bytecode output
+    --memory-limit n  limit the memory usage of the generated executable to 'n' bytes
+--no-column           no column number in debug information
+```
+
+Compile a script to a standalone executable:
+
+```sh
+./mqjsc -o hello examples/hello.js
+./hello
+```
+
+The generated executable includes its own memory buffer for MicroQuickJS
+allocations. The default is 16 MB. You can change it with the
+`--memory-limit` option at compile time.
+
 ## Stricter mode
 
 MQuickJS only supports a subset of JavaScript (mostly ES5). It is

examples/args.js

@@ -0,0 +1,8 @@
+if (typeof scriptArgs !== "undefined") {
+    print("Arguments provided: " + scriptArgs.length);
+    for (var i = 0; i < scriptArgs.length; i++) {
+        print("Argument " + i + ": " + scriptArgs[i]);
+    }
+} else {
+    print("No arguments provided (scriptArgs is undefined).");
+}

examples/fib.js

@@ -0,0 +1,7 @@
+function fib(n) {
+    if (n <= 1) return n;
+    return fib(n - 1) + fib(n - 2);
+}
+
+var n = 20;
+print("fib(" + n + ") = " + fib(n));

examples/hello.js

@@ -0,0 +1 @@
+print("Hello from MQuickJS standalone binary!");

examples/timers.js

@@ -0,0 +1,15 @@
+print("Start timers example...");
+
+setTimeout(function() {
+    print("Timer 1 (500ms) expired");
+}, 500);
+
+setTimeout(function() {
+    print("Timer 2 (200ms) expired");
+}, 200);
+
+setTimeout(function() {
+    print("Timer 3 (1000ms) expired. Exiting.");
+}, 1000);
+
+print("Main script finished, waiting for timers...");